The electron field emission of tetrahedral amorphous carbon ~ta-C! films deposited by filtered cathodic vacuum arc is reported. The ta-C films were found to have a threshold field ranging from 18 to 28 V mm, depending on the sp content. The nitrogenated ta-C ~ta-C:N! films show a lower threshold field of 12 V mm as compared to the ta-C films. The threshold field appears to be dependent on the f...

In order to obtain the effect of W and Hf elements on mechanical properties Ta–W–Hf alloys, structural, mechanical, electronic Ta–xW–6.25Hf (x = 6.25, 12.50, 18.75, 25.00, 31.25, 50.00) alloys were studied using first-principles calculation based density functional theory, supercell method. The calculated formation enthalpy elastic constants clarify that have structural dynamical stability. coh...

Usually one or more Teaching Assistants (TAs) are working onsite to help students during discussion sections, during office hours, or with lab assignments. However, in an environment where distance learning is used, an onsite TA might not be available. In this paper we propose a Remote TA Support System to provide anywhere-and-anytime TA assistance. The system provides both the students and the...

Aging and reduced longevity are due in part to the action of free radicals (FR). Melatonin (Mel) and thioctic acid (TA) are effective in protecting against the damage caused by FR. In this study, the effect of Mel and TA on the life cycle of Drosophila melanogaster was determined. We used a control group of flies, another group that was provided with Mel (0.43 mM) throughout their life cycle (M...

Catabolic states caused by injury are characterized by a loss of skeletal muscle. The anabolic action of IGF-I on muscle and the reduction of its muscle content in response to injury suggest that restoration of muscle IGF-I content might prevent skeletal muscle loss caused by injury. We investigated whether local overexpression of IGF-I protein by gene transfer could prevent skeletal muscle atr...

Powders of lithium niobate-tantalate across the full compositional range have been made and crystals grown using a lithium vanadate flux growth technique. The Li-content of a lithium tantalate crystal has been determined using the zero-birefringence temperature and Curie measurements, confirming the Li content is between that of congruent and stoichiometric crystals. X-ray diffraction measureme...

sunburn damage is a physiological disorder, which reducing pomegranate fruits quality and result to huge loss to the gardeners yearly. in this study, the effects of kaolin on maintaining fruit quality and decreasing sunburn damage of malas-e-torsh-e-saveh pomegranate was investigated. processed kaolin (surround® wp) with 0, 2.5, 5 and 10 % (w/v) was sprayed over the whole canopy and fruits at 4...

to prolong the storage life and quality of 'zafarany' peach, fruits were treated with uv-c irradiation with dosage of 1.435×10-4 wcm-2 with three time durations (0, 5 and 15 min) and as well immersion of fruits in 0 and 3% cacl2 solution. the experiment was carried out in a completely randomized design (factorial experiment) of four replications. fruits were harvested in commercial ma...

The zygomycete Blakeslea trispora is used commercially as natural source of â-carotene. Trisporic acid (TA) is secreted from the mycelium of B. trispora during mating between heterothallic strains and is considered as a mediator of the regulation of mating processes and an enhancer of carotene biosynthesis. Gas chromatography-mass spectrometry and multivariate analysis were employed to investig...

The present study was carried out to evaluate the influence of increasing amounts of dietary polyunsaturated fatty acids (PUFA) and alpha-tocopheryl acetate (alpha-TA) supplementation on lipid oxidation of raw and cooked thigh meat stored under refrigeration. One hundred ninety-two female, 1-d-old, broiler chickens were randomly distributed into 16 experimental treatments resuIting from the com...