scholarly journals Comprehensive characterization of yam tuber nutrition and medicinal quality of Dioscorea opposita and D. alata from different geographic groups in China

2020 ◽  
Vol 19 (11) ◽  
pp. 2839-2848
Author(s):  
Nan SHAN ◽  
Pu-tao WANG ◽  
Qiang-long ZHU ◽  
Jing-yu SUN ◽  
Hong-yu ZHANG ◽  
...  
Keyword(s):  
Dioscorea Opposita ◽  
Comprehensive Characterization

scholarly journals Energy and Exergy Analyses of Stirling Engine using CFD Approach

2020 ◽  
Vol 77 (1) ◽  
pp. 100-123
Author(s):  
Sherihan El- Ghafour ◽  
Nady Mikhael ◽  
Mohamed El- Ghandour
Keyword(s):  
Energy Analysis ◽  
Stirling Engine ◽  
Recovery Processes ◽  
Energy And Exergy ◽  
Main Driver ◽  
The Impact ◽  
Exergy Analyses ◽  
Comprehensive Characterization

A comprehensive characterization of the GPU-3 Stirling engine losses with the aid of the CFD approach is presented. Firstly, a detailed description of the losses-related phenomena along with the method of calculating each type of loss are addressed. Secondly, an energy analysis of the engine is carried out in order to specify the impact of each type of losses on the performance. Finally, the design effectivity of each component of the engine is investigated using an exergy analysis. The results reveal that the hysteresis loss occurs mainly within the working spaces due to the flow jetting during the first part of the expansion strokes. Additionally, the pressure difference between the working spaces is the main driver for the flow leakage through the appendix gap. The exposure of the displacer top wall to the jet of hot gas flowing into the expansion space during expansion stroke essentially increases the shuttle heat loss. A new definition for the regenerator effectiveness is presented to assess the quality of the heat storage and recovery processes. The energy analysis shows that regenerator thermal loss and pumping power represent the largest part of the engine losses by about 9.2% and 7.5% of the heat input, respectively. The exergy losses within regenerator and cold space are the highest values among the components, consequently, they need to be redesigned.

scholarly journals Robust formation of amorphous Sb2S3 on functionalized graphene for high-performance optoelectronic devices in the cyan-gap

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ju-Hung Chen ◽  
Sheng-Kuei Chiu ◽  
Jin-De Luo ◽  
Shu-Yu Huang ◽  
Hsiang-An Ting ◽  
...  
Keyword(s):  
High Performance ◽  
Carrier Transport ◽  
Deposition Process ◽  
Semiconductor Materials ◽  
Functionalized Graphene ◽  
Significant Progress ◽  
Graphene Glass ◽  
Comprehensive Characterization

Abstract Despite significant progress in the fabrication and application of semiconductor materials for optical emitters and sensors, few materials can cover the cyan-gap between 450 and 500 nm. We here introduce a robust and facile method to deposit amorphous Sb2S3 films with a bandgap of 2.8 eV. By exploiting the tunable functionality of graphene, a two-dimensional material, efficient deposition from a chemical was achieved. Ozone-generated defects in the graphene were shown to be required to enhance the morphology and quality of the material and comprehensive characterization of the seed layer and the Sb2S3 film were applied to design an optimal deposition process. The resulting material exhibits efficient carrier transport and high photodetector performance as evidenced by unprecedented responsivity and detectivity in semiconductor/graphene/glass vertical heterostructures. (112 A/W, 2.01 × 1012 Jones, respectively).

scholarly journals Contest Design with Uncertain Performance and Costly Participation

2017 ◽  
Author(s):  
Priel Levy ◽  
David Sarne ◽  
Igor Rochlin
Keyword(s):  
Real Life ◽  
Equilibrium Strategies ◽  
Beauty Pageant ◽  
Game Theoretic ◽  
Contest Design ◽  
Comprehensive Characterization

This paper studies the problem of designing contests for settings where a principal seeks to optimize the quality of the best performance obtained, and potential contestants only strategize about whether to participate in the contest, as participation incurs some cost. This type of contest can be mapped to various real-life settings (e.g., an audition, a beauty pageant, technology crowdsourcing). The paper provides a comparative game-theoretic based solution to two variants of the above underlying model: parallel and sequential contest, enabling a characterization of the equilibrium strategies in each. Special emphasis is placed on the case where the contestants are homogeneous which is often the case in real-life whenever the contestants are basically alike and their ranking in the contest is mostly influenced by some probabilistic factors (e.g., luck). Here, several (somehow counter-intuitive) properties of the equilibrium are proved, in particular for the sequential contest, leading to a comprehensive characterization of the principal preference between the two.

Physicochemical and bacteriological characterization of hospital effluents and their impact on the environment

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Human Health ◽  
Fecal Coliforms ◽  
Chemical Pollution ◽  
Hospital Effluents ◽  
Biological Contaminants ◽  
Almost All ◽  
Direct Discharge ◽  
Significant Chemical

Liquid effluents discharged by hospitals may contain chemical and biological contaminants whose main source is the different substances used for the treatment of patients. This type of rejection can present a sanitary potentially dangerous risk for human health and can provoke a strong degradation of diverse environmental compartments mainly water and soils. The present study focuses on the quality of the liquid effluents of Hassani Abdelkader’s hospital of Sidi Bel-Abbes (West of Algeria). The results reveal a significant chemical pollution (COD: 879 mgO2/L, BOD5: 850 mgO2/L, NH4+ : 47.9 mg/l, NO2- : 4.2 mg/l, NO3- : 56.8 mg/l with respect to WHO standard of 90 mgO2/L, 30 mgO2/L, 0.5 mg/l, 1 mg/l and 1 mg/l respectively). However, these effluents are biodegradable since the ratio COD/BOD5 do not exceeded the value of 2 in almost all samples. The presence of pathogen germs is put into evidence such as pseudomonas, the clostridium, the staphylococcus, the fecal coliforms and fecal streptococcus. These results show that the direct discharge of these effluents constitutes a major threat to human health and the environment.

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