35 research outputs found
Planetary silver nanoparticles originating from a magnetron sputter plasma
No full textIn a gas aggregation cluster source, nanoparticles are formed by aggregation of single atoms
to particles as well as by agglomeration of smaller particles to form larger particles. Because
the small particles are often electrically charged, it is possible that particles are mutually
attracted or repelled by electric forces. In this work we report the observation of bound multi-
nanoparticle systems which are the result of the electrical and centrifugal forces acting on
nanoparticles in a magnetron sputtering cluster source. Transmission electron microscopy
analysis of the deposited ‘planetary’ nanoparticle systems exhibits characteristic inter-particle
distances and sizes, consistent with different charge states of the particles. Simulations
confirm the presence of metastable bound nanoparticle systems up to at least 7/8 satellites.
The discovery of such ‘planetary’ nanoparticle systems inside a cluster source opens up
possibilities for more research into their properties and how they can be further controlled
and explored
Evaluation of thermotolerant rhizobacteria for multiple plant growth promoting traits from pigeonpea rhizosphere
No full textIn pigeonpea due to the prevailing high temperature, poor nodulation have usually been observed as a limiting factor in its productivity. Plant growth promoting traits of 5 pigeonpea rhizobacterial isolates out of 32, selected on the basis of maximum growth at 30, 40 and 50°C, were evaluated for their potential application in enhancing symbiosis and plant growth of pigeonpea. The level of IAA at 30, 40 and 50°C varied from 0.95-20.96 ?g/ml, 1.21- 34.82 ?g/ml and 0.16-17.34 ?g/ml in the presence of tryptophan respectively. Maximum flavonoid production and siderophore production was recorded bacterial isolates with S12p6 (6.68 ?g/ml) at 30°C and S1p1 (4.2 cm) at 40°C respectively. Isolates S1p1 and S12p6 showed relatively superior production of growth hormone, flavonoid-like compounds and siderophores can further be tested as co-inoculant with recommended Rhizobium for studying their efficacy under field conditions for symbiotic parameters and growth of pigeonpea
Increasing the optical absorption in a-Si thin films by embedding gold nanoparticles
No full textThe light conversion efficiency of traditional a-Si thin-film solar cells is limited by their low optical thicknesses, especially in the NIR. A possible approach to increase the light-trapping efficiency over the entire solar spectral range is to design solar-cell architectures which rely on the optical properties of plasmonic nanocomposite materials. We demonstrate that it is possible to have a controlled Gold nanoparticle optical absorption by varying the thickness of a covering a-Si thin-film. For thick a-Si films the Gold nanoparticle plasmon resonance vanishes likely due to the formation of a silicide. Optical absorption measurements as well as finite difference time-domain (FDTD) simulations were employed to determine the a-Si thickness-dependent optical absorption properties, which demonstrated a significantly increased optical absorption in a-Si
Simulation and Analysis of a 3-Phase Induction Motor and a Brushless DC Motor Using Simulink
No full textThis paper proposes the Simulation and Analysis of a 3-Phase Induction Motor and a Brushless DC Motor using the MATLAB/Simulink environment. In this paper a three-phase squirrel cage induction motor is simulated under different load conditions and the characteristic graphs of this motor are obtained. Induction motors are the most widely used motor drive and thus the results obtained are important in understanding and designing the motor for precise command and control. In a BLDC motor, the torque characteristic plays an important role in the design and analysis of BLDC motor drive systems which is used in industries for automated vehicles and collaborative robots. Therefore, it is necessary to predict the precise value of torque, which is determined by the characteristics obtained as a result of simulating back EMF vs time for the BLDC motor addressed in this paper. Both these motors are most widely used and find their application in various industries such as Automotive industry, Automobile sector, Aerospace, Pulp and Paper industry, Medical, consumer, Induction Automation Equipment and Instrumentation
How can Circular Strategies be implemented in Real Estate Valuation Practices: An Exploratory Research
No full textThe construction sector, as one of the world's greatest waste generators, is responsible for a cascade of events such as global warming, climate change, and natural resource depletion. Raw materials are continuously extracted from nature, and the rate at which they can refill is insufficient to meet demand. This system suffers significant losses across the value chain (Ellen MacArthur Foundation, 2013). On the contrary, the circular economy concept proposes a circular model of 'reuse-refurbish-recycle' that focuses on reducing waste and optimizing resource value retention. The strategy is ideal to adopt in a high-growth, high-waste sector like the built environment. The reason this research was taken up is because a significant gap is seen within valuation practices. The current valuation methods, although efficient, collect data and provide property valuations based on previous studies. For example, when using a comparative method of property valuation, we compare one asset with a neighboring one, that has similar features. This process incorporates the older values already provided to this old building, without accounting for innovations such as reusability or adaptability of the components How different would the sector be if we incorporated the value of circular interventions to the original value determined, rather than looking back at older valuation standards? Will there be a significant difference, and, more importantly, would it impact the way real estate investors viewed circularity? On conducting the research, The primary hypothesis of this study was that there is a link between circularity and valuation and that this link can be incorporated within present valuation procedures. The thesis research explains how the connections can be made, as well as specific actual instances for each. The number of possible scenarios are endless.Civil Engineering | Construction Management and Engineerin
Rice Bran Lipase Cloning and Expression
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Quality characteristics of Indian coffee
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Nanoscale induced formation of silicide around gold nanoparticles encapsulated in a-Si
No full textDecorating thin film solar cells with plasmonic nanoparticles is being pursued, in order to improve device efficiency through increased scattering and local field enhancement. Gold nanoparticles are in particular interesting, due to their chemical inertness and plasmon resonance in the visible range of the spectrum. In this work, gold nanoparticles fabricated by a gas aggregation nanoparticle source and embedded in a-Si (a commercial solar cell material) are studied using x-ray photo-electron spectroscopy, transmission electron microscopy, electron energy-loss spectroscopy and energy dispersive X-ray spectroscopy. The formation of gold silicide around the nanoparticles is investigated, as it has important consequences for the optical and electronic properties of the structures. Differently from previous studies, in which the silicide formation is observed for gold nanoparticles and thin films grown on top of crystalline silicon or silica, it is found that silicide formation is largely enhanced around the nanoparticles, owing to their increased surface/volume ratio. A detailed gold silicide formation mechanism is presented based on the results, and strategies for optimizing the design of plasmonically enhanced solar cells with gold nanoparticles encapsulated in a-Si are discussed
Media's Impact on Campus Rape Culture
No full textThe term ‘rape culture’ was coined in the 1970s by American feminists, to describe a culture of intimidation whereby male aggression toward women is both normalized and encouraged (Buchwald, Fletcher, & Roth, 1993). This honours project explores rape culture transmitted via an online medium at a Canadian university campus. Despite over 40 years of addressing sexual assault in Canada, research continues to show that approximately 20%-28.5% of Canadian undergraduate females are sexually assaulted during their four-year degree (Krebs, Lindquist, Warner, Fisher & Martin, 2009, p.643; Newton-Taylor, DeWit, & Gliksman, 1998, p. 156; Suran, 2014, p. 274). This is especially concerning since, in comparison, police reporting of sexual assault was at 5% in 2014 (Perreault, 2015, p. 25) and on-campus reporting consisted of only 700 documented cases from 87 Canadian universities and major colleges, between 2009 and 2013 (CBC News, 2015). Only since 2014 have universities and colleges begun to openly acknowledge the need for such policies and protocols (Mathieu, 2014, para. 6). The focus of this Honours project is to examine the student-led Facebook page “MRU Confessions” that is directed towards Mount Royal University students in Calgary, Alberta. Using a content analysis approach, the aim is to examine how, and to what extent media facilitates or challenges campus rape culture. Although this project is exploratory in nature and focuses on only one Canadian campus, it provides a basis from which other studies exploring rape culture on university campuses can emerge. Ultimately, this project aims to invoke discussion and increase awareness concerning rape culture while providing commentary to the development of a national framework that universities can use in shaping policy, programs, and education
Adsorption of CO and O2 molecules on Li metal adsorbed graphene: Search for graphene based gas sensors
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