Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"McMaster University" +contributor:("Puri, Ishwar K."). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


McMaster University

1. Abdalla, Ahmed Mohamed Sayed Ahmed. SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES.

Degree: PhD, 2017, McMaster University

The superior properties of carbon nanotubes (CNTs) are best manifest in bulk materials when the CNTs are organized in tandem and embedded in a continuous matrix. Decorating the CNTs with magnetic nanoparticles (MNPs) facilitates their expedient organization with a magnetic field. One of the most convenient methods for their decoration is to first treat the CNTs with oxidative acids, and then coprecipitated MNPs in situ. This method results magnetized CNTs that are covalently functionalized with the MNPs. The associated destruction in the CNTs required running a comparative study of this protocol to identify the influence of the acid treatment on the decoration of multiwalled CNTs (MWNTs). Further, we explore means to tune the physical properties of these magnetized CNTs (mMWNTs) by varying the (1) MNP material composition, and (2) MNP:MWNT (w/w) magnetization weight ratio (γ). The resulted composite materials (mMWNTs) are utilized to synthesize a novel and hitherto unreported class of colloidal suspensions (MCCs) for which the dispersed phase, which consists of MWNTs decorated with MNPs, is both magnetoresponsive and electrically conductive. Synthesis of the dispersed phase merges processes for producing ferrofluids and mMWNTs. Later, these MCCs are adapted and engineered to produce a biological ink containing MWNTs that are twice functionalized, first with MNPs and thereafter with the anti-c-Myc monoclonal antibodies (Abs). The ink is pipetted and dynamically self-organized by an external magnetic field into a dense electrically conducting sensor strip that measures the decrease in current when a sample containing c-Myc antigens (Ags) is deposited on it. On the other side, a nondestructive methods to magnetize MWNTs and provide a means to remotely manipulate them is through the electroless deposition of magnetic nickel nanoparticles on their surfaces. The noncovalent bonds between Ni nanoparticles and MWNTs produce a Ni-MWNT hybrid material (NiCH) that is electrically conductive and has an enhanced magnetic susceptibility and elastic modulus. Raising γ (Ni:MWNT weight ratios) increases the coating layer thickness, which influences the NiCH magnetic properties and tunes its elastic modulus. The NiCH was used to fabricate Ni-MWNT macrostructures and tune their morphologies by changing the direction of an applied magnetic field. Leveraging the hydrophilic Ni-MWNT outer surface, a water-based conductive ink was created and used to print a conductive path that had an electrical resistivity of 5.9 Ωm, illustrating the potential of this material for printing electronic circuits. Further, the NiCHs are introduced into an epoxy matrix at low 0.25-1% volume fractions and aligned along the direction of an applied magnetic field, which produces anisotropic bulk properties. However, nanoparticles aligned in perpendicular directions in sequential layers result in an effectively isotropic composite material. Furthermore, the subsequent annealing of the NiCH in the presence of air oxidizes nickel to nickel oxide whereas carbon is… Advisors/Committee Members: Puri, Ishwar K., Engineering Physics.

Subjects/Keywords: Carbon nanotubes; Functionalization; Nanofluid; Magnetic nanoparticles; Electroless deposition; Co-precipitation; Bioinks; Biosensors; Nickel oxide nanotubes; Supercapacitor

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Abdalla, A. M. S. A. (2017). SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/21958

Chicago Manual of Style (16th Edition):

Abdalla, Ahmed Mohamed Sayed Ahmed. “SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES.” 2017. Doctoral Dissertation, McMaster University. Accessed June 19, 2018. http://hdl.handle.net/11375/21958.

MLA Handbook (7th Edition):

Abdalla, Ahmed Mohamed Sayed Ahmed. “SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES.” 2017. Web. 19 Jun 2018.

Vancouver:

Abdalla AMSA. SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES. [Internet] [Doctoral dissertation]. McMaster University; 2017. [cited 2018 Jun 19]. Available from: http://hdl.handle.net/11375/21958.

Council of Science Editors:

Abdalla AMSA. SYNTHESIS AND CHARACTERIZATION OF MAGNETIC CARBON NANOTUBES. [Doctoral Dissertation]. McMaster University; 2017. Available from: http://hdl.handle.net/11375/21958


McMaster University

2. Nayak, Suchitra. Cost Optimization of Modular Data Centers.

Degree: MASc, 2018, McMaster University

During the past two decades, the increasing demand for digital telecommunications, data storage and data processing coupled with simultaneous advances in computer and electronic technology have resulted in a dramatic growth rate in the data center (DC) industry. It has been estimated that almost 2% of US total energy consumption and 1.5% of worlds total power consumption is by DCs. With the fossil fuels and earth’s natural energy sources depleting every day, greater efforts have to be made to save energy and improve efficiencies. As yet, most of the DCs are highly inefficient in energy usage. A significant part of this inherent inefficiency comes from poor design and rudimentary operation of current DCs. Thus, there is an urgent need to optimize the power consumption of DCs. This has led to the advent of modular DCs, newer scalable DC architectures, that reduces cost and increases efficiency by eliminating overdesign and allowing for scalable growth. This concept has been particularly appealing for small businesses who find it difficult to commit to setting up a traditional DC with huge upfront capital investment. However, their adoption and implementation is still limited because of a systematic approach of quickly identifying a module DC design. Considering many different choices for subcomponents, such as cooling systems, enclosures and power systems, this is a non-trivial exercise, especially, considering the complex multiphysics interactions among components that drive system efficiency. For designing such DCs, there is no research available. Therefore, most of the time, the engineers and designers rely on experience, to avoid lengthy elaborate engineering analysis, particularly during the conception stages of a DC deployment project. Here, we are developing a design tool that will not only optimize the design of modular DCs but also make the design process much faster than manually done by engineers. One of the major problem in designing modular DCs is finding optimum placement of the cooling unit to keep the temperature under ASHRAE guidelines (recommended safe temperature threshold). In addition to finding the optimum selection and placement of the cooling units and its auxiliary components, the tool also gives an optimum design for the power connection to the cooling units and IT racks with redundancy. Also, a bill of materials and key performance index (KPI) for those designs are generated by the tool. Overall, this tool in the hands of the bidders or sales representatives can significantly increase their chance of winning the project.

Thesis

Master of Applied Science (MASc)

Advisors/Committee Members: Puri, Ishwar K., Mechanical Engineering.

Subjects/Keywords: Data Center; Design

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Nayak, S. (2018). Cost Optimization of Modular Data Centers. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/23026

Chicago Manual of Style (16th Edition):

Nayak, Suchitra. “Cost Optimization of Modular Data Centers.” 2018. Masters Thesis, McMaster University. Accessed June 19, 2018. http://hdl.handle.net/11375/23026.

MLA Handbook (7th Edition):

Nayak, Suchitra. “Cost Optimization of Modular Data Centers.” 2018. Web. 19 Jun 2018.

Vancouver:

Nayak S. Cost Optimization of Modular Data Centers. [Internet] [Masters thesis]. McMaster University; 2018. [cited 2018 Jun 19]. Available from: http://hdl.handle.net/11375/23026.

Council of Science Editors:

Nayak S. Cost Optimization of Modular Data Centers. [Masters Thesis]. McMaster University; 2018. Available from: http://hdl.handle.net/11375/23026

.