+publisher:"Texas A&M University" +contributor:("Holtzapple, Mark")

Texas A&M University

1. Honang, Hanniel Jouvain. Reactor Physics Analysis of Air-Cooled Nuclear System.

Degree: MS, Nuclear Engineering, 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/156990

► The design of SACR? (Small Air-Cooled Reactor) fixated on evaluations of air as a potential coolant. The assessment offered in this thesis focused on reactor… (more)

▼ The design of SACR? (Small Air-Cooled Reactor) fixated on evaluations of air as a potential coolant. The assessment offered in this thesis focused on reactor physic analyses, and materials review and incorporation in a system defined by a highly corrosive environment. The oxidizing nature of air at high-temperature warrants the need to examine and compare materials for their oxidation temperature, their melting and boiling temperature, and their thermal conductivity. Material choices for the fuel, the cladding, the system?s casing/structural material and the reflector were evaluated in this study. Survey of materials and literature lead to the selection of six different cladding materials which are FeCrAl, APMT, Inconel 718 and stainless steel of type 304, 316 and 310. A review of their thermal properties, for a high oxidation temperature and melting temperature and the exhibition of a hard neutron spectrum lead to the selection of APMT steel material. This material was not only be selected as the fuel cladding but also as a casing for reflector and shielding materials. The design of this 600 MWth system was investigated considering reflector materials for fast spectrum. Lead-based reflectors (lead bismuth eutectic, lead oxide and pure lead), magnesium-based reflectors (magnesium oxide and magnesium aluminum oxide), and aluminum oxide reflectors were evaluated in this thesis. The design configurations were compared to determine those which provide a hard neutron spectrum, an economically appropriate cycle length, a low breeding ratio and the least amount of neutrons escaping the reactor. The assessments of these notable characteristics lead to the selection of MgO reflector. This reflector allowed the system to operate for six years, for a corresponding burnup of 85 MWd/kgU. The thermal setting of 875?C fuel temperature and 575?C of coolant and structural temperature promoted the design of a system with a fuel volume fraction smaller than that of the coolant volume fraction (40.28% - 45.01% respectively). This configuration was promoted favorable over an active core with a fuel volume fraction higher than or equal to the coolant volume fraction because of some thermal properties of air like a small thermal conductivity, specific heat and density. Advisors/Committee Members: Tsvetkov, Pavel (advisor), Holtzapple, Mark (committee member), McDeavitt, Sean (committee member).

Subjects/Keywords: air; gas; reactor; modular; MCNP; Argon; oxidation; reflector; burnup; leakage; Uranium; cycle; fuel; assembly

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APA (6^th Edition):

Honang, H. J. (2016). Reactor Physics Analysis of Air-Cooled Nuclear System. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156990

Chicago Manual of Style (16^th Edition):

Honang, Hanniel Jouvain. “Reactor Physics Analysis of Air-Cooled Nuclear System.” 2016. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/156990.

MLA Handbook (7^th Edition):

Honang, Hanniel Jouvain. “Reactor Physics Analysis of Air-Cooled Nuclear System.” 2016. Web. 17 Oct 2019.

Vancouver:

Honang HJ. Reactor Physics Analysis of Air-Cooled Nuclear System. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/156990.

Council of Science Editors:

Honang HJ. Reactor Physics Analysis of Air-Cooled Nuclear System. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156990

Texas A&M University

2. Nachiappan, Balasubraman. Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids.

Degree: 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-119

► The rising price of oil is hurting consumers all over the world. There is growing interest in producing biofuels from non-food crops, such as sugarcane… (more)

▼ The rising price of oil is hurting consumers all over the world. There is growing interest in producing biofuels from non-food crops, such as sugarcane trash. Lignocellulosic biomass (e.g., sugarcane trash) is an abundant, inexpensive, and renewable resource. The patented MixAlco process is a cost-effective solution, which does not require sterility or the addition of expensive enzymes to convert lignocellulosic biomass to transportation fuels and valuable chemicals. In this study, the MixAlco process was used to convert sugarcane trash to carboxylic acids under thermophilic conditions. Lime-treated sugarcane trash (80%) and chicken manure (20%) was used as the feedstock in rotary 1-L fermentors. Ammonium bicarbonate buffer was used to mitigate the effects of product (carboxylic acid) inhibition. Marine inoculum was used because of the high adaptability of the mixed culture of microorganisms present. Iodoform solution was added to inhibit methanogenesis. Preliminary batch studies over a 20-day period produced 19.7 g/L of carboxylic acids. Sugarcane trash had the highest average yield (0.31 g total acid/g VS fed) and highest average conversion (0.70 g VS digested/g VS fed) among the three substrates compared. Countercurrent fermentations were performed at various volatile solid loading rates (VSLR) and liquid residence times (LRT). The highest acid productivity of 1.40 g/(L?d) was at a total acid concentration of 29.9 g/L. The highest conversion and yield were 0.64 g VS digested/g VS fed and 0.36 g total acid/g VS fed, respectively. The continuum particle distribution model (CPDM) was used to predict acid concentration at various VSLR and LRT. The average error in between the predicted and experimental acid concentration and conversion were 4.62% and 1.42%, respectively. The effectiveness of several pretreatment methods was evaluated using the CPDM method. The best-performing method was short-term, no-wash, oxidative lime pretreatment with ball milling. At an industrial-scale solids loading of 300 g VS/L liquid, the CPDM ?map? predicts a total acid concentration of 64.0 g/L at LRT of 30 days, VSLR of 7 g/(L?d), and conversion of 57%. Also high conversion of 76% and high acid concentration of 52 g/L are achieved at a VSLR of 4 g/(L?d) and LRT of 30 days. Advisors/Committee Members: Holtzapple, Mark (advisor), Karthikeyan, Raghupathy (committee member), Glover, Charles (committee member).

Subjects/Keywords: Biofuels; MixAlco; Sugarcane trash; CPDM; Lignocellulosic biomass

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nachiappan, B. (2010). Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-119

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nachiappan, Balasubraman. “Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids.” 2010. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-119.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nachiappan, Balasubraman. “Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids.” 2010. Web. 17 Oct 2019.

Vancouver:

Nachiappan B. Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-119.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nachiappan B. Pretreatment and Fermentation of Sugarcane Trash to Carboxylic Acids. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-119

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

3. Taco Vasquez, Sebastian. Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst.

Degree: 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7480

► This research describes the production of hydrocarbons from acetone and isopropanol produced by the MixAlco process. The MixAlco process has two types of products: acetone… (more)

Subjects/Keywords: Isopropanol; Acetone; HZSM-5; hydrocarbons

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APA (6^th Edition):

Taco Vasquez, S. (2010). Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7480

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Taco Vasquez, Sebastian. “Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst.” 2010. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7480.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Taco Vasquez, Sebastian. “Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst.” 2010. Web. 17 Oct 2019.

Vancouver:

Taco Vasquez S. Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7480.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Taco Vasquez S. Transformation of Acetone and Isopropanol to Hydrocarbons using HZSM-5 Catalyst. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7480

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

4. Coleman Jr., Stanley Albert. Continuous fermentation of food scraps with constant pH control to produce carboxylic acids.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2031

► Global energy demands combined with environmental restrictions are fueling a move to alternative energy sources. Biofuels are formed from biomass; the MixAlco process is one… (more)

Subjects/Keywords: Food Scrap; Fermentation; pH; Carboxylic Acids; biomass

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APA (6^th Edition):

Coleman Jr., S. A. (2009). Continuous fermentation of food scraps with constant pH control to produce carboxylic acids. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2031

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Coleman Jr., Stanley Albert. “Continuous fermentation of food scraps with constant pH control to produce carboxylic acids.” 2009. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2031.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Coleman Jr., Stanley Albert. “Continuous fermentation of food scraps with constant pH control to produce carboxylic acids.” 2009. Web. 17 Oct 2019.

Vancouver:

Coleman Jr. SA. Continuous fermentation of food scraps with constant pH control to produce carboxylic acids. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2031.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Coleman Jr. SA. Continuous fermentation of food scraps with constant pH control to produce carboxylic acids. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2031

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

5. Roy, Samarpita. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.

Degree: MS, Civil Engineering, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/174665

► Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass… (more)

▼ Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass to mixed carboxylic acids. Using a buffer, the acids are neutralized to their corresponding salts, which are recovered from the fermentation broth. Finally, the carboxylate salts are chemically converted to mixed-alcohol fuels, hydrocarbon fuels (gasoline, jet fuel, etc.), and industrial chemicals. To be a viable alternative to fossil fuels, biofuels must be economical, provide a net energy gain, and be easily produced in large quantities. Previous studies have shown that as product concentration increases, the fermenting microorganisms are increasingly inhibited, which lowers production rates and yield. Maintaining low carboxylate salt concentration in fermentors reduces product inhibition and allows microorganisms to function efficiently and increase biomass digestion. In this study, anion-exchange resin (Amberlite IRA-67) was used to extract carboxylate salts from fermentation broth and thereby maintain near-neutral pH. Three different batch fermentations were performed using the following substrates: α-cellulose powder, shredded office paper, and lime-pretreated corn stover. It was observed that periodic extraction of carboxylate salts reduced product inhibition and thereby increased acid production in the fermentors. For all substrates, fermentors that employed an ion-exchange resin column for acid extraction had higher yield than fermentors where magnesium carbonate (MgCO_(3)) was used as a buffer to maintain pH. The yield expressed as gram total carboxylic acid produced per gram non-acid volatile solids (NAVS) fed were 0.15 (MgCO_(3) control) and 0.35 for α-cellulose substrate, 0.24 (MgCO_(3) control) and 0.37 for paper substrate, and 0.20 (MgCO_(3) control) and 0.35 for lime-pretreated corn stover. Other fermentation parameters such as conversion and selectivity also improved with periodic carboxylic acid extraction. The production of high-molecular-weight acids significantly increased for fermentors with IR extraction. This is important to the MixAlco® process because it generates high-energy products. Advisors/Committee Members: Batchelor, Bill (advisor), Holtzapple, Mark (advisor), Ying, Qi (committee member).

Subjects/Keywords: MixAlco process; ion exchange resin; fermentation; mixed-acid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roy, S. (2014). Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174665

Chicago Manual of Style (16^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174665.

MLA Handbook (7^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Web. 17 Oct 2019.

Vancouver:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174665.

Council of Science Editors:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/174665

Texas A&M University

6. Roy, Samarpita. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.

Degree: MS, Civil Engineering, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/174664

► Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass… (more)

▼ Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass to mixed carboxylic acids. Using a buffer, the acids are neutralized to their corresponding salts, which are recovered from the fermentation broth. Finally, the carboxylate salts are chemically converted to mixed-alcohol fuels, hydrocarbon fuels (gasoline, jet fuel, etc.), and industrial chemicals. To be a viable alternative to fossil fuels, biofuels must be economical, provide a net energy gain, and be easily produced in large quantities. Previous studies have shown that as product concentration increases, the fermenting microorganisms are increasingly inhibited, which lowers production rates and yield. Maintaining low carboxylate salt concentration in fermentors reduces product inhibition and allows microorganisms to function efficiently and increase biomass digestion. In this study, anion-exchange resin (Amberlite IRA-67) was used to extract carboxylate salts from fermentation broth and thereby maintain near-neutral pH. Three different batch fermentations were performed using the following substrates: α-cellulose powder, shredded office paper, and lime-pretreated corn stover. It was observed that periodic extraction of carboxylate salts reduced product inhibition and thereby increased acid production in the fermentors. For all substrates, fermentors that employed an ion-exchange resin column for acid extraction had higher yield than fermentors where magnesium carbonate (MgCO_(3)) was used as a buffer to maintain pH. The yield expressed as gram total carboxylic acid produced per gram non-acid volatile solids (NAVS) fed were 0.15 (MgCO_(3) control) and 0.35 for α-cellulose substrate, 0.24 (MgCO_(3) control) and 0.37 for paper substrate, and 0.20 (MgCO_(3) control) and 0.35 for lime-pretreated corn stover. Other fermentation parameters such as conversion and selectivity also improved with periodic carboxylic acid extraction. The production of high-molecular-weight acids significantly increased for fermentors with IR extraction. This is important to the MixAlco® process because it generates high-energy products. Advisors/Committee Members: Batchelor, Bill (advisor), Holtzapple, Mark (advisor), Ying, Qi (committee member).

Subjects/Keywords: MixAlco process; ion exchange resin; fermentation; mixed-acid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roy, S. (2014). Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174664

Chicago Manual of Style (16^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174664.

MLA Handbook (7^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Web. 17 Oct 2019.

Vancouver:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174664.

Council of Science Editors:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/174664

Texas A&M University

7. Roy, Samarpita. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.

Degree: MS, Civil Engineering, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/174666

► Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass… (more)

▼ Biofuels are increasingly gaining importance as an energy source. The MixAlco® process is a biomass-to-energy technology that uses mixed cultures of microorganisms to convert biomass to mixed carboxylic acids. Using a buffer, the acids are neutralized to their corresponding salts, which are recovered from the fermentation broth. Finally, the carboxylate salts are chemically converted to mixed-alcohol fuels, hydrocarbon fuels (gasoline, jet fuel, etc.), and industrial chemicals. To be a viable alternative to fossil fuels, biofuels must be economical, provide a net energy gain, and be easily produced in large quantities. Previous studies have shown that as product concentration increases, the fermenting microorganisms are increasingly inhibited, which lowers production rates and yield. Maintaining low carboxylate salt concentration in fermentors reduces product inhibition and allows microorganisms to function efficiently and increase biomass digestion. In this study, anion-exchange resin (Amberlite IRA-67) was used to extract carboxylate salts from fermentation broth and thereby maintain near-neutral pH. Three different batch fermentations were performed using the following substrates: α-cellulose powder, shredded office paper, and lime-pretreated corn stover. It was observed that periodic extraction of carboxylate salts reduced product inhibition and thereby increased acid production in the fermentors. For all substrates, fermentors that employed an ion-exchange resin column for acid extraction had higher yield than fermentors where magnesium carbonate (MgCO_(3)) was used as a buffer to maintain pH. The yield expressed as gram total carboxylic acid produced per gram non-acid volatile solids (NAVS) fed were 0.15 (MgCO_(3) control) and 0.35 for α-cellulose substrate, 0.24 (MgCO_(3) control) and 0.37 for paper substrate, and 0.20 (MgCO_(3) control) and 0.35 for lime-pretreated corn stover. Other fermentation parameters such as conversion and selectivity also improved with periodic carboxylic acid extraction. The production of high-molecular-weight acids significantly increased for fermentors with IR extraction. This is important to the MixAlco® process because it generates high-energy products. Advisors/Committee Members: Batchelor, Bill (advisor), Holtzapple, Mark (advisor), Ying, Qi (committee member).

Subjects/Keywords: MixAlco process; ion exchange resin; fermentation; mixed-acid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roy, S. (2014). Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174666

Chicago Manual of Style (16^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174666.

MLA Handbook (7^th Edition):

Roy, Samarpita. “Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations.” 2014. Web. 17 Oct 2019.

Vancouver:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174666.

Council of Science Editors:

Roy S. Effect of Extraction Using Ion-Exchange Resins on Batch Mixed-Acid Fermentations. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/174666

Texas A&M University

8. Berman, Ilan Clifford Abraham. Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment.

Degree: MS, Mechanical Engineering, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/174211

► Low-quality crude oil reserves require prohibitively high energy costs to extract and transport. The extreme viscosity and impurities of these oils prevents them from being… (more)

Subjects/Keywords: Crude Oil; Heavy; Sour; Upgrading; Electron Beam; System Design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Berman, I. C. A. (2015). Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174211

Chicago Manual of Style (16^th Edition):

Berman, Ilan Clifford Abraham. “Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment.” 2015. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174211.

MLA Handbook (7^th Edition):

Berman, Ilan Clifford Abraham. “Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment.” 2015. Web. 17 Oct 2019.

Vancouver:

Berman ICA. Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174211.

Council of Science Editors:

Berman ICA. Designing a System for Upgrading of Heavy Crude Oils Through Electron Beam Treatment. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/174211

Texas A&M University

9. Liang, Chao. Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification.

Degree: 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155692

► Enzymatic saccharification of non-food biomass, such as lignocellulose, can produce sugars. Sugars are the common feedstock for bioethanol, which can be substituted for transportation fuel… (more)

▼ Enzymatic saccharification of non-food biomass, such as lignocellulose, can produce sugars. Sugars are the common feedstock for bioethanol, which can be substituted for transportation fuel and address the shortage of fossil fuels. Traditional batch enzymatic saccharification usually wastes enzymes. An approach is countercurrent saccharification, which can make full use of enzymes and therefore reduce the enzyme loadings and lower the cost of sugar and biofuel production. In this research, various types of enzymes, enzyme loadings, and pretreatments for corn stover have been studied in batch hydrolysis to determine the preferred reaction conditions for countercurrent saccharification. Based on the results, cellulase CTec3 shows better enzymatic saccharification performance than CTec2 for both raw and pretreated corn stover. For a given enzyme dose, lime pretreatment improves enzymatic digestibility of corn stover significantly. Shock treatment of lime-treated corn stover further increases substrate digestibility. At a CTec3 dose of 10 mg protein/g dry biomass, the glucose yield of lime + shock treated corn stover is close to 100%. In contrast, lime pretreated corn stover yields 85%, and raw corn stover yields only 25%. For lime + shock treated corn stover, adding additional HTec3 (1 mg protein/g dry biomass) improved both glucose and xylose yields nearly 30% compared to CTec3 (1 mg protein/g dry biomass). The effect of production inhibition on enzyme activity was also tested. When 80 g/L glucose was initially added, glucose and xylose yields decrease 20% and 5%, respectively. Countercurrent saccharification of lime + shock treated corn stover with enzyme CTec3 (1 mg protein/g dry biomass) and CTec3 (1 mg protein/g dry biomass) + HTec3 (1 mg protein/g dry biomass) was studied. When the systems reached steady state, the Slope Method was used to determine product yields and verify that steady state was achieved. For CTec3 (1 mg protein/g dry biomass), the glucose and xylose yields were 64% and 39%, respectively. For CTec3 (1 mg protein/g dry biomass) + HTec3 (1 mg protein/g dry biomass), glucose and xylose yields were 72% and 62%, respectively. To reach a given glucose yield (64%), when only adding CTec3, countercurrent saccharification saves nearly 50% of the enzyme loading compared with batch saccharification. To reach a given glucose yield (72%), when adding CTec3 and HTec3 (50%:50%), countercurrent saccharification saves nearly 30% of the enzyme loading compared with batch saccharification. It requires approximately two months to achieve steady-state countercurrent saccharification. In the future, simulation work is necessary to determine the optimal operating condition. Continuum Particle Distribution Modeling (CPDM) is a potential model to simulate countercurrent saccharification. Advisors/Committee Members: Holtzapple, Mark T (advisor), Karim, M. Nazmul (advisor), Nikolov, Zivko (committee member).

Subjects/Keywords: Batch Saccharification; Countercurrent Saccharification

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liang, C. (2015). Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155692

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liang, Chao. “Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification.” 2015. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/155692.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liang, Chao. “Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification.” 2015. Web. 17 Oct 2019.

Vancouver:

Liang C. Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/155692.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liang C. Batch Enzymatic Hydrolysis of Pretreated Corn Stover and Improvements with Countercurrent Saccharification. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155692

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

10. Weber, Jamie. Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/156350

► Stochastic flow conditions, such as large unsteady wind gusts and coherent structures in turbulent winds, cause detrimental blade loadings to horizontal axis wind turbines (HAWT).… (more)

▼ Stochastic flow conditions, such as large unsteady wind gusts and coherent structures in turbulent winds, cause detrimental blade loadings to horizontal axis wind turbines (HAWT). Such loadings lead to large blade root bending moments, increased blade fatigue damage, and inconsistent rotor torque and thrust. In the present work, robust, fast-response passive flow control (PFC) methods for mitigating adverse effects from unsteady aerodynamic loadings on a HAWT blade due were developed. The PFC methods examined were that of a leading-edge slot and a novel combination of two passive flow control devices, namely a leading-edge slot and a passively oscillating surface located at the slot exit (slot-flap). Wind tunnel tests were conducted at a Reynolds number of 0.3 x 10⁶ and unsteady flow conditions were produced by an upstream disturbance generator. The disturbance generator utilized shed vortices from a rapidly deflecting upstream airfoil to simulate high-frequency, impulse-like load excursions on the main airfoil, representative of large wind gusts and coherent structures in turbulent winds. Results from the test series demonstrated reduced maximum load excursions of 7 to 9% using the PFC methods as compared to clean airfoil tests. Effectiveness of the PFC methods decreased for loading with multiple vortex interactions. To further examine the influence of the slot-flap oscillations, two additional slot-flap configurations were examined: (1) increased rigidity and thickness and (2) reduced length. Both variations indicated a further reduction of transient load excursions from 8 to 12% as compared to a clean airfoil. Coefficient of momentum (c_mu) was calculated for each slot-flap configuration, which was on the order of 1% and varied with angle of attack. The reduced excitation frequency (F+) ranged from 0.96 to 1.23 based upon the slot-flap configuration. The three slot-flap variations showed comparable c_mu and F+ average values and were within the uncertainty limits, indicating that the improved mitigation from the slot-flap variations is not attributed to c_mu and F+ contributions. Based upon this study, the location and oscillation amplitude of the slot-flap configurations are significant parameters in the resulting mitigation effects. Advisors/Committee Members: Rediniotis, Othon K (advisor), White, Edward B (committee member), Holtzapple, Mark T (committee member).

Subjects/Keywords: unsteady aerodynamics; flow control; wind turbine blade

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Weber, J. (2012). Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Weber, Jamie. “Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade.” 2012. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/156350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Weber, Jamie. “Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade.” 2012. Web. 17 Oct 2019.

Vancouver:

Weber J. Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/156350.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Weber J. Passive Flow Control Method for Mitigation of Unsteady Load Excursions on a Wind Turbine Blade. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/156350

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

11. Darvekar, Pratik. Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform.

Degree: 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/157090

► Fuels and chemicals from lignocellulosic biomass, a renewable energy source, is an attractive solution to meet ever-increasing global energy needs and reduce global climate change.… (more)

▼ Fuels and chemicals from lignocellulosic biomass, a renewable energy source, is an attractive solution to meet ever-increasing global energy needs and reduce global climate change. In the biochemical conversion of lignocellulose, the first and the most expensive step is pretreatment. This study focuses on the efficacy of shock pretreatment, a mechanical process that uses a shockwave to alter the biomass structure. Corn stover was pretreated with lime and shock. The two pretreatments (lime-only and lime + shock) were evaluated using enzymatic hydrolysis, batch mixed-culture fermentations, and continuous countercurrent mixed-culture fermentation. In a 120-h enzymatic hydrolysis, shock pretreatment increased the glucan digestibility of SLP (submerged lime pretreatment) corn stover by 3.5% and OLP (oxidative lime pretreatment) corn stover by 2.5%. The continuum particle distribution model (CPDM) was used to simulate a four-stage continuous countercurrent mixed-culture fermentation using empirical rate models obtained from simple batch experiments. The CPDM model determined that lime + shock pretreatment increased the total carboxylic acids yield by 28.5% over lime-only pretreatment in a countercurrent fermentation with a VSLR (volatile solids loading rate) of 12 g/(L?day) and LRT (liquid retention time) of 30 days. In a semi-continuous countercurrent fermentation performed in the laboratory for 112 days with a VSLR of 1.875 g/(L?day) and LRT of 16 days, lime + shock pretreatment increased the total carboxylic acids yield by 14.8%. The experimental results matched closely with CPDM models predictions (4.05% error). Calcium carbonate and magnesium carbonate were compared as buffers for mixed-culture fermentations of lime and lime + shock pretreated corn stover. Batch fermentations at five different substrate loadings of lime and lime + shock pretreated corn stover were performed with MgCO3 and CaCO3 buffer. In batch fermentations with 100 g/L substrate, the carboxylic acid production more than doubled (2.7 times for lime and 2.6 times for lime + shock corn stover) when MgCO3 buffer was used. In addition, CPDM was used to simulate and predict the performance of a four-stage countercurrent fermentation using MgCO3 and CaCO3 buffer. CPDM predicts that in a four-stage countercurrent fermentation with a high volatile solids loading rate (VSLR 12 g/(L?day)) and low liquid residence time (LRT 10 day), using MgCO3 buffer will yield a carboxylic acid concentration of 26.1 g/L, a 22.5% increase over CaCO3 buffer. Adding shock to lime pretreatment increased the yields at all substrate loadings in both batch fermentations and CPDM model predictions. The effect of hydrogen and carbon dioxide gas concentrations in the headspace of mixed-culture fermentations was studied. Using H2:CO2 (1:1) at 1 atm in the fermenter headspace increased the total carboxylic acids by 37%. Using CO2-only in the headspace reduced the total acids by 4%, but shifted the acid spectrum toward high-molecular-weight acids. Advisors/Committee Members: Holtzapple, Mark (advisor), El-Halwagi, Mahmoud (committee member), Glover, Charles (committee member), Nikolov, Zivko (committee member).

Subjects/Keywords: Lignocellulose; Enzymatic Hydrolysis; Mixed-Culture Fermentations; Shock Pretreatment; Continuum Particle Distribution Modeling (CPDM)

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APA (6^th Edition):

Darvekar, P. (2016). Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157090

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Darvekar, Pratik. “Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform.” 2016. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/157090.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Darvekar, Pratik. “Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform.” 2016. Web. 17 Oct 2019.

Vancouver:

Darvekar P. Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform. [Internet] [Thesis]. Texas A&M University; 2016. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/157090.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Darvekar P. Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform. [Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157090

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

12. Yang, Kefan. Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations.

Degree: 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/161630

► The carboxylate platform is one of three recognized processes (sugar, thermochemical, and carboxylate) that converts biomass into chemicals and hydrocarbon fuels. One example of the… (more)

▼ The carboxylate platform is one of three recognized processes (sugar, thermochemical, and carboxylate) that converts biomass into chemicals and hydrocarbon fuels. One example of the carboxylate platform is the MixAlco process. Using mixed-culture countercurrent fermentation, biomass is digested into carboxylate salts. Using chemical reactions (e.g., hydrogenation), a variety of products are produced such as alcohols, esters, ketones, and ethers. In this process, methane production is blocked using an inhibitor, which enhances product value. To enhance the conversion of biomass and increase product yields, the following experiments were done. To extend the liquid residence time, the liquid maintenance target was adjusted to increase the total liquid volume of the system. The average liquid residence time was 88.9 days compared with the traditional 20?30 days. The results show that the concentration of liquid product is 34.3 g/L, conversion is 64.2%, yield is 11.2%, acetic acid equivalent yield (aceq) is 16.6%, selectivity is 17.5%, and acetic acid equivalent selectivity is 25.9%. Also, this countercurrent system shown comparably high selectivity to butyric acid. Using the established steady-state countercurrent fermentation system described above, all the conditions are the same except for the usage of resin extraction. The average concentration of liquid product is 28.4 g/L which is lower because of the extraction. The conversion is 70.3%, total acid yield (including resin extraction) is 16.5%, aceq total acid yield is 27.0%, selectivity is 23.4%, and aceq selectivity is 38.5%. The conversion, yield, and selectivity all were enhanced. The extraction enhances the selectivity of liquid product, especially the selectivity of medium-chain carboxylic acids (C5?C7), which means extraction using a resin promotes chain elongation in the secondary fermentation. One explanation is that extraction reduces product inhibition. Introducing ethanol to a countercurrent fermentation system shows different phenomenon compared with a previously investigated batch system. In countercurrent fermentation, primary fermentation was promoted, but chain-elongation was inhibited. In contrast, batch fermentation enhanced chain-elongation. Advisors/Committee Members: Holtzapple, Mark T (advisor), Kao, Katy (committee member), Capareda, Sergio C (committee member).

Subjects/Keywords: Liquid Residence Time; Extraction; Resin; Chain Elongation; Countercurrent Fermentation

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APA (6^th Edition):

Yang, K. (2017). Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Kefan. “Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations.” 2017. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/161630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Kefan. “Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations.” 2017. Web. 17 Oct 2019.

Vancouver:

Yang K. Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations. [Internet] [Thesis]. Texas A&M University; 2017. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/161630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang K. Effect of Liquid Residence Time, Extraction, and Chain Elongation on Countercurrent Mixed-Acid Fermentations. [Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

13. Skorcz, Alex Joseph. Performance evaluation of an active filter non-regenerative AC drive.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2068

► The purpose of this work is to evaluate the performance of a specific ac drive topology that is of current interest in industry. With the… (more)

Subjects/Keywords: Half-Controlled Rectifier; Harmonics; Even Harmonics

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APA (6^th Edition):

Skorcz, A. J. (2009). Performance evaluation of an active filter non-regenerative AC drive. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2068

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Skorcz, Alex Joseph. “Performance evaluation of an active filter non-regenerative AC drive.” 2009. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2068.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Skorcz, Alex Joseph. “Performance evaluation of an active filter non-regenerative AC drive.” 2009. Web. 17 Oct 2019.

Vancouver:

Skorcz AJ. Performance evaluation of an active filter non-regenerative AC drive. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2068.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Skorcz AJ. Performance evaluation of an active filter non-regenerative AC drive. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2068

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

14. Maruyama, Ashley Katsumi. Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2546

► The trend in passenger vehicle internal combustion (IC) engines is to produce smaller, more fuel-efficient engines with power outputs comparable to those of large displacement… (more)

▼ The trend in passenger vehicle internal combustion (IC) engines is to produce smaller, more fuel-efficient engines with power outputs comparable to those of large displacement engines. One way to accomplish this goal is through using turbochargers (TCs) supported on semi-floating ring bearings (SFRBs). The thesis presents progress on the nonlinear modeling of rotor-bearing systems (RBSs) by including engine-induced TC housing excitations. Test data collected from an engine-mounted TC unit operating to a top speed of 160 krpm (engine speed = 3,600 rpm) validates the nonlinear predictions of shaft motion. Engine-induced housing excitations are input into the nonlinear time transient rotor model as Fourier coefficients (and corresponding phase angles) derived from measured TC center housing accelerations. Analysis of recorded housing accelerations shows the IC engine induces TC motions with a broad range of subsynchronous frequencies, rich in engine (e) superharmonics. In particular, 2e and 4e vibration frequencies contribute greatly to housing motion. Most importantly, the analysis reveals TC center and compressor housings do not vibrate as a rigid body. Eigenvalue analysis of the TC system evidences four damped natural frequencies within the TC operating speed range. However, only the highest damped natural frequency (first elastic mode, f = 2,025 Hz, ? = 0.14) is lightly-damped (critical speed = 150 krpm). Predicted linear and nonlinear imbalance response amplitudes increase with TC shaft speed, with linear predictions agreeing with test data at high shaft speeds. The differences between predictions and test data are attributed to an inaccurate knowledge of the actual TC rotor imbalance distribution. For the nonlinear analysis, predicted shaft motions not accounting for housing accelerations show the TC is stable (i.e. no subsynchronous whirl) at all but the lowest shaft speeds (<70 krpm). However, predicted shaft motions accounting for housing accelerations, as well as the test data, reveal TC motions rich in subsynchronous activity. Clearly, engine-induced housing accelerations have a significant impact on TC shaft motions. Predicted total shaft motions show good agreement with test data. Predicted nonlinear subsynchronous amplitudes as well as peak shaft amplitudes also agree well with test data. However, nonlinear predictions only show TC shaft vibrations attributed to engine order frequencies below 6e, whereas test data evidences TC vibrations are due to order frequencies greater than 6e. Overall, nonlinear predictions and test data illustrate the importance of accounting for engine-induced housing vibrations in the design and operation of TC systems. The good agreement between predictions and test data serve to validate the rotor model. The tools developed will aid a TC manufacturer in reducing development time and expenditures. Advisors/Committee Members: San Andres, Luis A. (advisor), Childs, Dara W. (committee member), Holtzapple, Mark T. (committee member).

Subjects/Keywords: Turbocharger; Excitations; Prediction

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APA (6^th Edition):

Maruyama, A. K. (2009). Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2546

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Maruyama, Ashley Katsumi. “Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data.” 2009. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2546.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Maruyama, Ashley Katsumi. “Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data.” 2009. Web. 17 Oct 2019.

Vancouver:

Maruyama AK. Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2546.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Maruyama AK. Prediction of automotive turbocharger nonlinear dynamic forced response with engine-induced housing excitations: comparisons to test data. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2546

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

15. Gay, Sebastien Emmanuel. Contactless magnetic brake for automotive applications.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1005

► Road and rail vehicles and aircraft rely mainly or solely on friction brakes. These brakes pose several problems, especially in hybrid vehicles: significant wear, fading,… (more)

Subjects/Keywords: automotive; eddy-current brake; dynamic stability; vehicle dynamics

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APA (6^th Edition):

Gay, S. E. (2009). Contactless magnetic brake for automotive applications. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1005

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gay, Sebastien Emmanuel. “Contactless magnetic brake for automotive applications.” 2009. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-1005.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gay, Sebastien Emmanuel. “Contactless magnetic brake for automotive applications.” 2009. Web. 17 Oct 2019.

Vancouver:

Gay SE. Contactless magnetic brake for automotive applications. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1005.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gay SE. Contactless magnetic brake for automotive applications. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1005

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

16. Lubis, Mirna R. Desalination Using Vapor-Compression Distillation.

Degree: 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-510

► The ability to produce potable water economically is the primary purpose of seawater desalination research. Reverse osmosis (RO) and multi-stage flash (MSF) cost more than… (more)

▼ The ability to produce potable water economically is the primary purpose of seawater desalination research. Reverse osmosis (RO) and multi-stage flash (MSF) cost more than potable water produced from fresh water resources. As an alternative to RO and MSF, this research investigates a high-efficiency mechanical vapor-compression distillation system that employs an improved water flow arrangement. The incoming salt concentration was 0.15% salt for brackish water and 3.5% salt for seawater, whereas the outgoing salt concentration was 1.5% and 7%, respectively. Distillation was performed at 439 K (331oF) and 722 kPa (105 psia) for both brackish water feed and seawater feed. Water costs of the various conditions were calculated for brackish water and seawater feeds using optimum conditions considered as 25 and 20 stages, respectively. For brackish water at a temperature difference of 0.96 K (1.73oF), the energy requirement is 2.0 kWh/m3 (7.53 kWh/kgal). At this condition, the estimated water cost is 0.39/m3 (1.48/kgal) achieved with 10,000,000 gal/day distillate, 30-year bond, 5% interest rate, and 0.05/kWh electricity. For seawater at a temperature difference of 0.44 K (0.80oF), the energy requirement is 3.97 kWh/m3 (15.0 kWh/kgal) and the estimated water cost is 0.61/m3 (2.31/kgal). Greater efficiency of the vapor compression system is achieved by connecting multiple evaporators in series, rather than the traditional parallel arrangement. The efficiency results from the gradual increase of salinity in each stage of the series arrangement in comparison to parallel. Calculations using various temperature differences between boiling brine and condensing steam show the series arrangement has the greatest improvement at lower temperature differences. The following table shows the improvement of a series flow arrangement compared to parallel: ?T (K) Improvement (%)*1.111 2.222 3.333 15.21 10.80 8.37 * Incoming salt concentration: 3.5% Outgoing salt concentration: 7% Temperature: 450 K (350oF) Pressure: 928 kPa (120 psig) Stages: 4 Advisors/Committee Members: Holtzapple, Mark T. (advisor), Barrufet, Maria A. (committee member), El-Halwagi, Mahmoud M. (committee member).

Subjects/Keywords: Desalination; mechanical vapor compression.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lubis, M. R. (2010). Desalination Using Vapor-Compression Distillation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-510

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lubis, Mirna R. “Desalination Using Vapor-Compression Distillation.” 2010. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-510.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lubis, Mirna R. “Desalination Using Vapor-Compression Distillation.” 2010. Web. 17 Oct 2019.

Vancouver:

Lubis MR. Desalination Using Vapor-Compression Distillation. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-510.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lubis MR. Desalination Using Vapor-Compression Distillation. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-510

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

17. Babbar, Yogesh. Wind Tunnel and Flight Testing of Active Flow Control on a UAV.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8003

► Active flow control has been extensively explored in wind tunnel studies but successful in-flight implementation of an active flow control technology still remains a challenge.… (more)

Subjects/Keywords: UAV; active flow control; Extra 330; pulsed blowing; fluidic actuator; flight testing; wind tunnel testing; ailerons

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APA (6^th Edition):

Babbar, Y. (2011). Wind Tunnel and Flight Testing of Active Flow Control on a UAV. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Babbar, Yogesh. “Wind Tunnel and Flight Testing of Active Flow Control on a UAV.” 2011. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Babbar, Yogesh. “Wind Tunnel and Flight Testing of Active Flow Control on a UAV.” 2011. Web. 17 Oct 2019.

Vancouver:

Babbar Y. Wind Tunnel and Flight Testing of Active Flow Control on a UAV. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Babbar Y. Wind Tunnel and Flight Testing of Active Flow Control on a UAV. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

18. Johnson, Shalom. Development of a Pulse Modulator for Active Flow Control in Turbomachinery.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8035

► In todays highly maneuverable jet aircraft designs, aircraft are required to have a propulsion system that can operate during sudden accelerations and rapid changes in… (more)

Subjects/Keywords: stall suppression; Turbomachinery; axial compressor; oscillatory blowing

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APA (6^th Edition):

Johnson, S. (2011). Development of a Pulse Modulator for Active Flow Control in Turbomachinery. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8035

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Johnson, Shalom. “Development of a Pulse Modulator for Active Flow Control in Turbomachinery.” 2011. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8035.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Johnson, Shalom. “Development of a Pulse Modulator for Active Flow Control in Turbomachinery.” 2011. Web. 17 Oct 2019.

Vancouver:

Johnson S. Development of a Pulse Modulator for Active Flow Control in Turbomachinery. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8035.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johnson S. Development of a Pulse Modulator for Active Flow Control in Turbomachinery. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8035

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

19. Smith, Aaron Douglas. Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9193

► Via mixed-culture fermentation, the MixAlcoTM produces carboxylic acids, which are chemically converted into industrial chemicals and hydrocarbon fuels. Using pilot fermentation data, The Continuum Particle… (more)

▼ Via mixed-culture fermentation, the MixAlcoTM produces carboxylic acids, which are chemically converted into industrial chemicals and hydrocarbon fuels. Using pilot fermentation data, The Continuum Particle Distribution Model (CPDM) overestimated acid concentration (30?90% error) but more closely estimated conversion (<15% error). Incorporating the effect of air into the model reduced the absolute error of all predictions by >50%. To analyze fermentation data with semi-continuous streams, the Slope method calculates the average flowrate of material from the slope of the moving cumulative sum with respect to time. Although the Slope method does not significantly improve accuracy, it dramatically reduces error compared to traditional techniques (>40% vs. <2%). Nutrients are essential for microbial growth and metabolism. For a four-bottle fermentation train, five nutrient contacting patterns (single-point nutrient addition to Fermentors F1, F2, F3, F4, and multi-point parallel addition) were investigated. Compared to the traditional nutrient contacting method (all nutrients fed to F1), the near-optimal feeding strategies improved exit yield, culture yield, process yield, exit acetate-equivalent yield, conversion, and total acid productivity by approximately 31%, 39%, 46%, 31%, 100%, and 19%, respectively. To estimate nitrogen concentration profiles, a segregated-nitrogen model uses separate mass balances for solid- and liquid-phase nitrogen; the nitrogen reaction flux between phases is assumed to be zero. Using five fermentation trains, each with a different nutrient contacting pattern, the model predictions capture basic behavior; therefore, it is a reasonable tool for estimating and controlling nitrogen profiles. To determine the optimal scenario for mixed-acid fermentations, an array of batch fermentations was performed that independently varied the C/N ratio and the blend of carbohydrate (office paper) and nutrient (wet chicken manure (CM)). Reactant was defined as non-acid volatile solids (NAVS). C/N ratios were based on non-acid carbon (CNA). A blend of 93% paper and 7% wet CM (dry basis) with a C/N ratio of 37 g CNA/g N had the highest culture yield (0.21 g acidproduced/g NAVSinitial), total acid productivity (0.84 g acidproduced/(Lliq?d)), and conversion (0.43 g NAVSconsumed/g NAVSinitial). Advisors/Committee Members: Holtzapple, Mark T. (advisor), Glover, Charles (committee member), Hall, Kenneth (committee member), Capareda, Sergio (committee member).

Subjects/Keywords: Mixed-acid fermentation; C/N Ratio; nitrogen; nitrogen model; CPDM; pilot fermentation

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APA (6^th Edition):

Smith, A. D. (2011). Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Aaron Douglas. “Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation.” 2011. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Aaron Douglas. “Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation.” 2011. Web. 17 Oct 2019.

Vancouver:

Smith AD. Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith AD. Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

20. Foucault, Lucas Jose. Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9847

► The main objective of this thesis was to study the anaerobic digestion (AD) of wastewater from a chicken processing facility and of crude glycerol from… (more)

Subjects/Keywords: Anaerobic digestion; co-digestion; glycerol; glycerin; methane; biogas; chicken processing wastewater

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APA (6^th Edition):

Foucault, L. J. (2011). Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9847

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Foucault, Lucas Jose. “Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel.” 2011. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Foucault, Lucas Jose. “Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel.” 2011. Web. 17 Oct 2019.

Vancouver:

Foucault LJ. Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Foucault LJ. Anaerobic Co-digestion of Chicken Processing Wastewater and Crude Glycerol from Biodiesel. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9847

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

21. Xu, Xin. Direct conversion of carboxylate salts to carboxylic acids via reactive extraction.

Degree: 2008, Texas A&M University

URL: http://hdl.handle.net/1969.1/86006

► The MixAlco process, a proprietary technology owned by Texas A&M University, converts biomass (e.g., municipal solid waste, sewage sludge, paper, agricultural residues, and energy crops)… (more)

▼ The MixAlco process, a proprietary technology owned by Texas A&M University, converts biomass (e.g., municipal solid waste, sewage sludge, paper, agricultural residues, and energy crops) into usable chemicals (e.g., acetic acid) and fuels (e.g., ethanol). Historically, calcium carbonate has been used as the buffer. Recently, it was found that using ammonium bicarbonate as the buffering agent enhances the fermentation conversion. In this case, fermentation broth contains ammonium salts (e.g., ammonium acetate, propionate, butyrate, pentanoate). Therefore, the downstream processing steps (including extraction, purification, esterification, and product separation) must be compatible with the ammonium carboxylate salts formed in the fermentation. This research focuses on converting fermentation broth carboxylate salts into their corresponding acids via "acid springing." Reactive extraction and thermal conversion (distillation) are crucial parts of the acid springing process. Because the components of the fermentation broth are over 80% ammonium acetate and 20% other ammonium carboxylate salts (ammonium propionate, butyrate, pentanoate, etc.), all the initial experiments in this study were performed using reagentgrade ammonium acetate to simplify the reaction. Later, actual fermentation broth was employed. The primary objective of this study was to provide the optimal operating conditions to make the downstream processing steps of the MixAlco process compatible with ammonium carboxylate salts formed in the fermentation. The optimal initial concentration for reactive extraction should be 150-200 g/L and the volume ratio of aqueous phase and extractant should be 1:1. The distribution coefficient reaches the maximum value when the concentration of TOA is 20% (vol %) in n-octanol. The batch distillation study shows that there are two reaction stages: (1) water leaves the system at 100-106 ?C and (2) the acid-amine complex decomposes at 160-180 ?C. Advisors/Committee Members: Holtzapple, Mark T. (advisor), Glover, Charles J. (committee member), Engler, Cady R. (committee member).

Subjects/Keywords: CARBOXYLIC ACIDS; REACTIVE EXTRACTION

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APA (6^th Edition):

Xu, X. (2008). Direct conversion of carboxylate salts to carboxylic acids via reactive extraction. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/86006

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Xu, Xin. “Direct conversion of carboxylate salts to carboxylic acids via reactive extraction.” 2008. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/86006.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Xu, Xin. “Direct conversion of carboxylate salts to carboxylic acids via reactive extraction.” 2008. Web. 17 Oct 2019.

Vancouver:

Xu X. Direct conversion of carboxylate salts to carboxylic acids via reactive extraction. [Internet] [Thesis]. Texas A&M University; 2008. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/86006.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Xu X. Direct conversion of carboxylate salts to carboxylic acids via reactive extraction. [Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/86006

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

22. Zentay, Agustin Nicholas. Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation.

Degree: 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/152675

► Transportation fuels are the major driver for fossil fuel production, a burden that many countries have tried to ease by blending fossil fuels with biofuel… (more)

▼ Transportation fuels are the major driver for fossil fuel production, a burden that many countries have tried to ease by blending fossil fuels with biofuel substitutes such as ethanol. Current U.S. ethanol production relies on fermentation of starchy biomass (e.g., corn), which competes with food. Using lignocellulose avoids competition with food; however, it is difficult to digest using traditional batch saccharification. This work investigates countercurrent saccharification as an alternative that reduces enzyme requirements. Compared to baseline yields for standard batch saccharification, countercurrent saccharification reduces enzyme requirements by 5 to 37 times. Initial studies identified Solka-Floc as an acceptable substrate to represent treated biomass; it is readily available and reliably consistent from sample to sample. To measure yields, batch saccharifications were performed at various enzyme loadings and reaction times. Two relatively low enzyme concentrations were selected for further study: 2 and 5 mg protein/g biomass, or 2.6 and 6.4 mg protein/g glucan, respectively. Both of the selected loadings are below levels suggested for commercial use. For each enzyme loading tested, a multi-stage, semi-continuous countercurrent train was constructed. The first experiments used trains consisting of eight 1-L bottles loaded with ?-cellulose, using the same concentrations as the batch experiments. Liquid and solid phases were countercurrently contacted, with transfers of each phase occurring every second day for approximately 4?6 weeks, until steady-state operation was maintained for at least 10 days. At 2 and 5 mg/g enzyme loadings, total sugar yields reached 55.9% and 85.3%, respectively. A follow up study using 16 bottles and 2 mg/g loading produced total sugar yields of 73.4%. In the interest of future scale-up, alternatives to the cycloheximide and tetracycline antibiotic cocktail were investigated. Preliminary results suggest that chloroform or a volatile essential plant oil may be effective. Future work is needed to confirm the antimicrobial strength of these compounds at low concentrations, which is needed to limit enzyme inhibition. Advisors/Committee Members: Holtzapple, Mark T (advisor), Glover, Charles J (committee member), Capareda, Sergio (committee member).

Subjects/Keywords: countercurrent; enzymes; enzymatic; saccharification; sugar; biofuels; ethanol

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APA (6^th Edition):

Zentay, A. N. (2014). Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152675

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zentay, Agustin Nicholas. “Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation.” 2014. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/152675.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zentay, Agustin Nicholas. “Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation.” 2014. Web. 17 Oct 2019.

Vancouver:

Zentay AN. Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/152675.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zentay AN. Countercurrent Enzymatic Saccharification of Lignocellulosic Biomass and Improvements Over Batch Operation. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152675

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

23. Cui, Yuanchen. Exploration of Pavement Oxidation Model Applications and Field Validation.

Degree: 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153666

► Asphalt paved road is one of the building blocks of the modem world. Flexibility is one of its major advantages; however, this flexibility suffers from… (more)

▼ Asphalt paved road is one of the building blocks of the modem world. Flexibility is one of its major advantages; however, this flexibility suffers from asphalt oxidation since the first day of pavement service life. Several elements of binder oxidation have been investigated, such as oxidation kinetics, asphalt hardening in response to oxidation, pavement design, and environmental conditions. Based on understandings on those elements, pavement oxidation models have been developed to predict the oxidation rates in pavements in specific locations. This prediction contributes greatly to reducing the pavement life cost and elongating pavement service life. However, experimental methods to determine required model inputs, values of those oxidation elements, seriously limit the model application. This work focuses on understanding the elements of asphalt oxidation and on exploring applications of the pavement oxidation model. This dissertation presents a detailed investigation of pavement oxidation, two new test methods to obtain the model inputs, and a study on dynamic diffusion-reaction balance. First, a detailed investigation on pavement oxidation was reported to give some general conclusions about asphalt oxidation rates vary largely in different climate zones, and pavement design defines thickness of the asphalt film and thus controls aging. Secondly, new methods to obtain the model inputs were proposed: (1) Aging tests on laboratory made asphalt concretes have been proven as new information sources on asphalt concretes aging to replace sampling field cores. This method makes a pavement oxidation prediction before construction a reality; (2) Aging on recovered asphalt binders have been proven as new information sources on asphalt kinetics and hardening properties. This method solves the problem that original binders are not available in many cases. With the data obtained from these aging tests, long term oxidation predictions for the pavements were made using the pavement oxidation model and validated their accuracies by field data, including one complicated case, a layer-by-layer prediction on a seal coat treated pavement. To better understand the asphalt aging process, the last topic in this dissertation was to study a dynamic balance between oxygen diffusion and oxidation reaction using the pavement oxidation model. Advisors/Committee Members: Glover, Charles (advisor), Martin, Amy Epps (committee member), Holtzapple, Mark (committee member), Wilhite, Benjamin (committee member).

Subjects/Keywords: Asphalt oxidation; pavement oxidation model

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APA (6^th Edition):

Cui, Y. (2014). Exploration of Pavement Oxidation Model Applications and Field Validation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153666

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cui, Yuanchen. “Exploration of Pavement Oxidation Model Applications and Field Validation.” 2014. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/153666.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cui, Yuanchen. “Exploration of Pavement Oxidation Model Applications and Field Validation.” 2014. Web. 17 Oct 2019.

Vancouver:

Cui Y. Exploration of Pavement Oxidation Model Applications and Field Validation. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/153666.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cui Y. Exploration of Pavement Oxidation Model Applications and Field Validation. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153666

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

24. Vincent George, John Kennady. Theoretical and Experimental Study of Biobased Succinic Acid Production.

Degree: MS, Energy, 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/165922

► Biomass based succinic acid is gaining increasing interest as a potential platform chemical for replacing a large petroleum-based bulk chemical market. Biomass as a renewable… (more)

▼ Biomass based succinic acid is gaining increasing interest as a potential platform chemical for replacing a large petroleum-based bulk chemical market. Biomass as a renewable resource has proved the economic and sustainable potential to produce succinic acid by fermentation method. Biobased succinic acid has yet faced with the challenge of becoming competitive with petrochemical method because of its higher production cost. To lower the production cost, extensive research efforts have been undertaken in upstream technology that involves strain development via metabolic engineering, and downstream technology that aims to improve efficiency of purification method. Many research studies have focused on either one of two technological areas, with little interest on interaction between them. This present work integrates the processing steps from upstream and downstream technologies using a systematic approach and presents an optimal production pathway from a large number of possible process configurations. The development of such a process pathway involves selection of bioproducts, feedstock, pre-treatment technology, microorganism and product separation method. Performance criteria such as titre, rate, yield and minimum production cost, express the optimality of production pathway. Optimization study indicates that succinic acid seems to be the most promising bioproduct among all other bioproducts. Corn stover is the suitable feedstock to produce succinic acid. Based on the findings from optimization study, experimental work was performed with an aim of achieving better performance criteria than it is reported in literature. This work selected corn stover as feedstock, and a bacterium called, Basfia succiniciproducens for converting corn stover-derived glucose into succinic acid. To date, no deliberate experiment has been done on this bacterium to improve succinic acid production, despite its promising features. Highest succinic acid yield of 18 g/100g total sugar (glucose plus xylose) was observed in this experiment. Genetically modified strain of the bacterium reported a much higher yield of 71 gm succinic acid/ 100gm of glucose. Advisors/Committee Members: Capareda, Sergio (advisor), Holtzapple, Mark (committee member), El Halwagi, Mahmoud (committee member).

Subjects/Keywords: Biomass based succinic acid; platform chemicals; microbial fermentation; green technology; titre; yield; production rate; genetic modification; petrochemical method

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APA (6^th Edition):

Vincent George, J. K. (2017). Theoretical and Experimental Study of Biobased Succinic Acid Production. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165922

Chicago Manual of Style (16^th Edition):

Vincent George, John Kennady. “Theoretical and Experimental Study of Biobased Succinic Acid Production.” 2017. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/165922.

MLA Handbook (7^th Edition):

Vincent George, John Kennady. “Theoretical and Experimental Study of Biobased Succinic Acid Production.” 2017. Web. 17 Oct 2019.

Vancouver:

Vincent George JK. Theoretical and Experimental Study of Biobased Succinic Acid Production. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/165922.

Council of Science Editors:

Vincent George JK. Theoretical and Experimental Study of Biobased Succinic Acid Production. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165922

Texas A&M University

25. Zou, Amy Fangze. Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs.

Degree: 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/156374

► After implications of hydraulic fracturing operations, the commercial production of tight formations and shale plays were successfully achieved in past decades. The industry now shifts… (more)

Subjects/Keywords: CO2; gas injection; unconventional reservoirs; compositional simulation; diffusion

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APA (6^th Edition):

Zou, A. F. (2015). Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156374

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zou, Amy Fangze. “Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs.” 2015. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/156374.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zou, Amy Fangze. “Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs.” 2015. Web. 17 Oct 2019.

Vancouver:

Zou AF. Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/156374.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zou AF. Compositional Simulation of CO2 Enhanced Oil Recovery in Unconventional Liquid Reservoirs. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156374

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

26. Wu, Haoran. Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation.

Degree: MS, Chemical Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/174328

► The carboxylate platform is a biomass-to-energy process that converts biomass into hydrocarbon fuels or chemicals. The mixed-acid fermentation is the essential unit of the process… (more)

Subjects/Keywords: Biofuel; Carboxylate platform; Anaerobic digestion; Ion-exchange resin; in-situ separation

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APA (6^th Edition):

Wu, H. (2018). Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174328

Chicago Manual of Style (16^th Edition):

Wu, Haoran. “Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation.” 2018. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174328.

MLA Handbook (7^th Edition):

Wu, Haoran. “Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation.” 2018. Web. 17 Oct 2019.

Vancouver:

Wu H. Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174328.

Council of Science Editors:

Wu H. Effect of Carbon Dioxide-Sustained Adsorption Using Ion Exchange Resin on Mixed-Acid Fermentation. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174328

Texas A&M University

27. Wang, Yang. An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.

Degree: PhD, Electrical Engineering, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/174217

► Fuel economy of conventional hybrid electric vehicles (HEVs) gets limited improvements because of constraints from conventional internal combustion engines (ICEs). Electric vehicles (EVs) have the… (more)

Subjects/Keywords: Hybrid Electric Vehicle; Dynamic Programming; StarRotor engine; Optimal Design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, Y. (2015). An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174217

Chicago Manual of Style (16^th Edition):

Wang, Yang. “An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.” 2015. Doctoral Dissertation, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/174217.

MLA Handbook (7^th Edition):

Wang, Yang. “An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.” 2015. Web. 17 Oct 2019.

Vancouver:

Wang Y. An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/174217.

Council of Science Editors:

Wang Y. An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/174217

Texas A&M University

28. Teipel, Blake. Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema.

Degree: PhD, Materials Science and Engineering, 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/158111

► A combination of scientific and commercial research efforts are presented in this work. Exploits in both early- and late-stage research and subsequent scale-up opportunities are… (more)

▼ A combination of scientific and commercial research efforts are presented in this work. Exploits in both early- and late-stage research and subsequent scale-up opportunities are discussed, in particular, highlighting novel idea-to-market approaches suitable for composite materials with nanoscale fillers. Both polymeric and metallic nanocomposites are commercially explored, whereas answers to fundamental questions for polymeric composites filled with biologically derived nanomaterials are provided. In the first example, the role of a stabilizer in the stiffening and strengthening of cellulose nanocrystal (CNC) filled epoxy was studied. Cetyltrimethylammonium bromide (CTAB), a cationic surfactant, and Boehmite nanoclay (Boe) were mixed with CNCs in water during processing. Boe+CTAB synergistically stiffened the CNC-epoxy composites, increasing elastic modulus by 72% over neat epoxy and 49% over unstabilized CNC-epoxy composites. Boe-treated CNC-epoxy composites exhibited a 23% increase in tensile strength over unfilled epoxy and a 63% increase over an unstabilized CNC-epoxy composite. These nanocomposites also maintained the strain-at- failure of neat epoxy and increased the storage modulus above Tg by 96%. Then, in a second example, amine functionalization provided a functional layer between cellulose nanocrystals (CNCs) and polypropylene. Diethylenetriamine (DETA) was combined with polypropylene (PP) and then with CNCs in high-shear mixing. DETA-treatment stiffened the CNC-PP composites increasing elastic modulus by 75% over neat PP and untreated CNC-PP composites. DETA-treated CNC-PP composites also exhibited a 32% increase in tensile strength over unfilled PP and a 28% improvement for CNC-PP composites without DETA treatment. These nanocomposites were prepared without the use of organic solvents using a scalable, high-volume manufacturing approach. A commercial scale-up plan for this work is presented in detail. Thermal interface materials (TIMs) are required to enhance the contact between component surfaces, decrease thermal interfacial resistance, and increase heat conduction across the interface. A new TIM discussed herein is prepared using an already established technique of electrocodeposition, forming a flexible, nanocomposite film. The film is highly compliant, utilizing an ultra-high thermal conductivity greater than 250 W/m・K, as opposed to the best commercially available TIMs with conductivities ranging from 5–80 W/mK. This technology also achieves a total bulk thermal impedance of 1–4 × 10^-3 K・cm²/W, an order of magnitude lower than commercially available TIMs Advisors/Committee Members: Akbulut, Mustafa (advisor), Green, Micah (committee member), Creasy, Terry (committee member), Holtzapple, Mark (committee member).

Subjects/Keywords: Cellulose; Nanomaterials

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Teipel, B. (2016). Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158111

Chicago Manual of Style (16^th Edition):

Teipel, Blake. “Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema.” 2016. Doctoral Dissertation, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/158111.

MLA Handbook (7^th Edition):

Teipel, Blake. “Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema.” 2016. Web. 17 Oct 2019.

Vancouver:

Teipel B. Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/158111.

Council of Science Editors:

Teipel B. Polymeric Composites with Cellulose Nanomaterials: Development of Synergistic Treatments and Stabilization Schema. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158111

Texas A&M University

29. Mroue, Ahmed Mohamad. Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study.

Degree: MS, Energy, 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/165861

► The future energy portfolio at the national and subnational levels should consider its impact on water resources and environment. Although energy resources are the main… (more)

▼ The future energy portfolio at the national and subnational levels should consider its impact on water resources and environment. Although energy resources are the main contributors to the national economic growth, these resources must not exploit other primary natural resources. A study of the connections between energy and natural systems, such as water, environment and land, is required prior to proceeding to energy development. Policy makers are in need of a tool quantifying the interlinkages across energy, water and the environment, while demonstrating the consequent trade-offs across the nexus systems. The Energy Portfolio Assessment Tool (EPAT) is a tool enabling the user to create different energy portfolio scenarios with various energy and electricity sources, and evaluate the scenario’s sustainability environmentally and economically. The Water-Energy-Food nexus systematic approach is the foundation of the EPAT framework. Texas is a suitable geographical region to study and assess the current and future implications of energy portfolios. The research evaluates the impact of the current and projected Texas energy portfolios on water and the environment, taking into consideration production, generation and production change. The three scenarios are: Reference Case - 2015, CPP with Energy Reference Case - 2030, and No CPP with Energy Reference Case - 2030. In the presence of the CPP, total water withdrawal is expected to decrease significantly, while total water consumption is projected to experience a shy decrease due to the increase in water consumption in electricity generation caused by the new electricity mix. The CPP is successful in decreasing emissions, but is accompanied by tradeoffs, such as increasing water consumption and land use by electricity generation. The absence of the CPP will lead to an extreme surge in total water withdrawn, consumed and emissions. Therefore, conservation policies should move from the silo to the nexus mentality to avoid unintended consequences as improving one part of the nexus could end up worsening the other parts. Advisors/Committee Members: Mohtar, Rabi H (advisor), Holtzapple, Mark T (committee member), Pistikopoulos, Efstratios N (committee member).

Subjects/Keywords: Energy; Policy; Renewable Energy; Water; Sustainable Energy; Energy-Water Nexus; Electric Power Generation; Power Plant Cooling; Oil and Gas Production; Hydraulic Fracturing; Water-Energy-Food Nexus; Energy Portfolio; Energy Planning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mroue, A. M. (2017). Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165861

Chicago Manual of Style (16^th Edition):

Mroue, Ahmed Mohamad. “Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study.” 2017. Masters Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/165861.

MLA Handbook (7^th Edition):

Mroue, Ahmed Mohamad. “Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study.” 2017. Web. 17 Oct 2019.

Vancouver:

Mroue AM. Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/165861.

Council of Science Editors:

Mroue AM. Energy Portfolio Assessment Tool (EPAT): Sustainable Energy Planning Using the WEF Nexus Approach - Texas Case Study. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165861

Texas A&M University

30. Liu, Guanlan. A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics.

Degree: 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155702

► Asphalt pavement is the major pavement type worldwide. Today, over 90% highways are paved with asphalt concrete. Like other pavement types, asphalt pavement suffers from… (more)

▼ Asphalt pavement is the major pavement type worldwide. Today, over 90% highways are paved with asphalt concrete. Like other pavement types, asphalt pavement suffers from certain types of damage, which call for maintenance. Billions of dollars are spent on the maintenance of asphalt pavement each year. To reduce the maintenance cost, satisfactory pavement design that addresses the mechanical and chemical properties of asphalt pavement, is necessary. In pavement design, two of the factors affecting pavement durability are the absorption of asphalt into porous aggregates and the hardening of asphalt due to oxidation. Asphalt absorption reduces the effective binder content in the pavement. Meanwhile, the oxidative hardening of asphalt will eventually lead to pavement fatigue cracking. This work focused on the properties of flexible pavement materials, especially asphalt absorption process and oxidation kinetics. The objectives were to evaluate and improve the current method of absorption measurement, and to study the oxidation kinetics of warm mix asphalt (a new pavement technology widely used). To achieve these objectives, studies were designed and conducted. Asphalt absorption in porous materials was systematically studied. A new method for asphalt absorption measurement, using a density gradient column, was developed to measure asphalt absorption in single aggregate particles at a higher precision level. Experimental results showed that asphalt absorption correlated very well with the void volume in asphalt, regardless of the aggregate type. Moreover, the effect of contact time on asphalt absorption was studied. Finally, the asphalt absorption of warm mix materials from loose mix samples was measured using a density gradient column. Additionally, the oxidation kinetics of warm mix asphalt was investigated. Oxidation kinetics parameters were estimated and used in a pavement aging simulation. Insignificant differences between the warm mix asphalts and the base binder control were found. These oxidation kinetics results provided a better understanding of the pavement performance of warm mix asphalt. Advisors/Committee Members: Glover, Charles J (advisor), Lytton, Robert L (committee member), Holste, James C (committee member), Holtzapple, Mark T (committee member).

Subjects/Keywords: Asphalt; Asphalt Absorption; Asphalt Oxidation Kinetics; Warm Mix Asphalt; Pavement Aging Simulation.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, G. (2015). A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155702

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Guanlan. “A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics.” 2015. Thesis, Texas A&M University. Accessed October 17, 2019. http://hdl.handle.net/1969.1/155702.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Guanlan. “A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics.” 2015. Web. 17 Oct 2019.

Vancouver:

Liu G. A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/1969.1/155702.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu G. A Study on the Durability of Flexible Pavement Materials: Asphalt Absorption and Oxidation Kinetics. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155702

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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