Materials Literature
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This paper presents a new bi-directional DC/DC converter for supercapacitor interfacing in high-power applications. The converter acts as a VSI-based step-down DC/DC converter during the supercapacitor charging mode and as a qZSI-based step-up DC/DC converter during the energy recovery mode. To provide voltage matchin…
Minimally processed vegetables are products susceptible to chemical and biological changes, thus becoming highly perishable. During sweet potatoes (Ipomoea batatas Lam.) processing, some deteriorative reactions occur affecting quality, mainly change of color. The purpose of this research is to avoid or minimize this d…
We demonstrate that organic photovoltaic cell performance is influenced by changes in the crystalline orientation of composite layer structures. A 1.5 nm thick self-organized, polycrystalline template layer of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) orients subsequently deposited layers of a diindenoperyl…
DADH catalyzes the flavin-dependent oxidative deamination of d-amino acids to the corresponding α-keto acids and ammonia. Here we report the first X-ray crystal structures of DADH at 1.06 Å resolution and its complexes with iminoarginine (DADH(red)/iminoarginine) and iminohistidine (DADH(red)/iminohistidine) at 1.30 Å…
Protoporphyrin (Pp IX) derivatives were prepared to study the relationship between photosensitizer structure and photoactivity, with an emphasis on understanding the role of membrane interactions in the efficiency of photosensitizers used in photodynamic therapy (PDT). The synthetic strategies described here aimed at…
Recent evidence suggests silicon dioxide micro- and nanoparticles induce cytotoxic effects on lung cells. Thus, there is an increasing concern regarding their potential health hazard. Nevertheless, the putative toxicity of nanoparticles in mammalian cells has not yet been systematically investigated. We previously not…
This document presents a model for an AC electric arc furnace considering the highly nonlinear and time varying characteristics of this type of load. Using the nonlinear differential equation that describes the V-I (voltage vs. current) arc characteristic, both voltage fluctuations in the time domain and the arc lengt…
Organic solar cells hold promise as an economical means of harvesting solar energy due to their ease of production and processing. However, the efficiency of such organic photovoltaic (OPV) devices is currently below that required for widespread adoption. The efficiency of an OPV is inextricably linked to its nanoscal…
Aminosilane-modified poly(ethylene glycol) (PEG), PEG- block -poly(propylene glycol) (PPG)- block -PEG (PEPEG), and PPG- block -PEG- block -PPG (PPEPG) diacrylate prepolymers are synthesized as new membrane materials for gas separation. By combining the in situ sol−gel process and cross-linking process together, the s…
Abstract Pore-free composites combining alumina particles within a matrix of pure aluminium are produced by pressure infiltration, varying systematically the degree of the contiguity, β, of the ceramic phase by sintering prior to infiltration. The thermal expansion of these composites is characterized using repeated c…
Investigations were carried out on the diversity of phytoplankton in relation to physico-chemical parameters with respect to pollution status of two perennial ponds of Sattur area, Tamil Nadu. Fifty species were identified belonging to Chlorophyceae, Bacillariophyceae, Cyanophyceae and Euglenophyceae. High value of ph…
This paper compares the radial vibration forces in 10-pole/12-slot fractional-slot SPM and IPM machines which are designed to produce the same output torque, and employ an identical stator but different SPM, V-shape and arc-shape IPM rotor topologies. The airgap field and radial vibration force density distribution as…
Collagen model tissues, consisting of cells embedded in a collagen matrix at different concentrations (of cells and collagen) were analyzed. Rheological properties were measured and complementary confocal microscopy analysis carried out. An important feature, corresponding to the breakdown of the collagen network (i.e…
nonfiction Amy Leach Memorandum Animals to the 205 And of every living thing of all flesh, two of every sort shalt thou bring into the ark, to keep them alive with thee. Unfortunately, Animals, we are not going to be able to bring all of you with us this time. Last time there were eight humans on board and at least tw…
Abstract : Feasibility of using beamed microwave energy to increase thrust of solid rocket motors during launch is analyzed. Coupling of microwave radiation with internal energies of micron-sized alumina particles and the successive transfer of internal energy of particles to thermal and then kinetic energy of gas is…
This paper resumes the main mathematical models of Fuel Cells (PEM models). In particular, a comparison study of the various models introduced in the technical literature is presented and the dependency of the various model parameters is analyzed in different operating conditions. As the manifold of the model paramete…
Heat transfer in the laminar-wavy film of liquid falling over the heated plate is studied numerically. To describe the wavy film flow the integral model is applied. Calculation results demonstrate the effect of physical properties of liquid and wavy flow parameters on heat transfer intensification by stationary runnin…
Copper wire bonding has matured quickly in recent years, motivated mostly by the significant increase in the cost of gold, which has nearly doubled in the last three years. In response, manufacturers of wire bonding assembly equipment and consumable materials have become committed to support copper wire bonding packag…
The CdGa2Se4 layers were grown by the hot-wall epitaxy method. From the absorption measurement, the band-gap variation in CdGa2Se4 was well interpreted using Varshni’s equation. After the postannealing in various ambient, the behavior of point defects in CdGa2Se4 was investigated by measuring photoluminescence (PL). P…
The effects of electromagnetic brake (EMBR) on the flow of liquid melt during continuous casting of cladding aluminium alloys are investigated by numerical simulation and validated by experiments. The results show that the EMBR can effectively damp the strong impingement of the two streams of melt, decrease the jet le…