Energy and Exergy Analyses of Stirling Engine using CFD Approach

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.

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The dynamics of recovery processes of physical activity of people who recovered from COVID-19

LAPLAGE EM REVISTA ◽

10.24115/s2446-6220202173c1667p.607-612 ◽

2021 ◽

Vol 7 (3C) ◽

pp. 607-612

Author(s):

Sergey Kokhan ◽

Elena Romanova ◽

Vladislav Dychko ◽

Elena Dychko ◽

Danil Dychko ◽

...

Keyword(s):

Quality Of Life ◽

Physical Activity ◽

Life Assessment ◽

Control Group ◽

Breathing Exercises ◽

Rehabilitation Programs ◽

Recovery Processes ◽

Coronavirus Infection ◽

The Impact

The article shows the results of physical therapy of those who have had coronavirus infection COVID-19 and who have completed a month's course of physical rehabilitation as a part of rehabilitation measures in the conditions of the innovative clinic "Academy of Health". The aim of the research is to study the impact of pulmonary rehabilitation programs for patients with moderate to severe COVID-19. The implementation of special breathing exercises made it possible to improve the oxygen saturation in the blood, to reduce shortness of breath and indicators of respiratory symptoms. The tolerance to exercise has increased; physical activity and the quality of life of patients with pneumonia associated with COVID-19 have improved. The best results of the EQ-5D quality of life assessment were recorded in the experimental group compared to the control group.

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Dynamic-SoS: An Approach for the Simulation of Systems-of-Systems Dynamic Architectures

The Computer Journal ◽

10.1093/comjnl/bxz028 ◽

2019 ◽

Vol 63 (5) ◽

pp. 709-731

Author(s):

Wallace Manzano ◽

Valdemar Vicente Graciano Neto ◽

Elisa Yumi Nakagawa

Keyword(s):

Architectural Design ◽

Systems Of Systems ◽

Dynamic Architecture ◽

Design Time ◽

Operation Results ◽

The Impact ◽

Reconfiguration Controller

Abstract Systems-of-Systems (SoS) combine heterogeneous, independent systems to offer complex functionalities for highly dynamic smart applications. Besides their dynamic architecture with continuous changes at runtime, SoS should be reliable and work without interrupting their operation and with no failures that could cause accidents or losses. SoS architectural design should facilitate the prediction of the impact of architectural changes and potential failures due to SoS behavior. However, existing approaches do not support such evaluation. Hence, these systems have been usually built without a proper evaluation of their architecture. This article presents Dynamic-SoS, an approach to predict/anticipate at design time the SoS architectural behavior at runtime to evaluate whether the SoS can sustain their operation. The main contributions of this approach comprise: (i) characterization of the dynamic architecture changes via a set of well-defined operators; (ii) a strategy to automatically include a reconfiguration controller for SoS simulation; and (iii) a means to evaluate architectural configurations that an SoS could assume at runtime, assessing their impact on the viability of the SoS operation. Results of our case study reveal Dynamic-SoS is a promising approach that could contribute to the quality of SoS by enabling prior assessment of its dynamic architecture.

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Comprehensive characterization of claudin-low breast tumors reflects the impact of the cell-of-origin on cancer evolution

Nature Communications ◽

10.1038/s41467-020-17249-7 ◽

2020 ◽

Vol 11 (1) ◽

Author(s):

Roxane M. Pommier ◽

Amélien Sanlaville ◽

Laurie Tonon ◽

Janice Kielbassa ◽

Emilie Thomas ◽

...

Keyword(s):

Breast Tumors ◽

Cancer Evolution ◽

Cell Of Origin ◽

The Impact ◽

Comprehensive Characterization

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

Journal of Integrative Agriculture ◽

10.1016/s2095-3119(20)63270-1 ◽

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

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

Scientific Reports ◽

10.1038/s41598-020-70879-1 ◽

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).

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Biochemical characterization of fruit juice for impact of storage on commercial beverages

Asian Journal of Dairy and Food Research ◽

10.18805/ajdfr.dr-1182 ◽

2017 ◽

Vol 36 (04) ◽

Author(s):

Sujata Sethy

Keyword(s):

Biochemical Characterization ◽

Cadmium Content ◽

Sunset Yellow ◽

E Coli ◽

Duration Of Storage ◽

Food Colour ◽

Microbial Analysis ◽

The Impact

The study was performed to evaluate the impact of storage time on safety and hygienic quality of commercial fruit beverage on the basis of market survey. Three most popular brands and three least popular brands of fruit beverages like squash and syrup were selected and stored for nine months at room temperature. The samples were subjected to chemical analysis for food colour, preservative (SO2), heavy metals (Pb and Cd), pectin and microbial analysis for bacteria, fungus, yeast and E. coli at bimonthly interval. Lead content in all the beverages and synthetic permitted food colours like sunset yellow 136.5 ppm in squash A and tartazine 133.2 ppm in squash B and 310.9 ppm in Syrup F was found which exceeded the permissible limit. Preservative (SO2) and cadmium content remained within the acceptable limit. Total bacterial and fungal count increased sharply with the advancement of storage particularly from 7th month onwards. Duration of storage had no effect on the colour and heavy metal content of the beverages.

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A comprehensive characterization of the impact of mycophenolic acid on the metabolism of Jurkat T cells

Scientific Reports ◽

10.1038/s41598-017-10338-6 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 9

Author(s):

Ana A. Fernández-Ramos ◽

Catherine Marchetti-Laurent ◽

Virginie Poindessous ◽

Samantha Antonio ◽

Céline Petitgas ◽

...

Keyword(s):

T Cells ◽

Mycophenolic Acid ◽

Jurkat T Cells ◽

The Impact ◽

Comprehensive Characterization

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Characterization of amaranth and bean flour blends and the impact on quality of gluten-free breads

Journal of Food Measurement & Characterization ◽

10.1007/s11694-019-00060-4 ◽

2019 ◽

Vol 13 (2) ◽

pp. 1440-1450 ◽

Cited By ~ 1

Author(s):

S. Liu ◽

D. Chen ◽

J. Xu

Keyword(s):

Gluten Free ◽

Bean Flour ◽

Flour Blends ◽

The Impact

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Brewing tests of new fine aroma hop varieties (Humulus lupulus L.) Saaz Brilliant, Saaz Comfort and Saaz Shine

KVASNY PRUMYSL ◽

10.18832/kp2021.67.464 ◽

2021 ◽

Vol 67 (4) ◽

pp. 464-473

Author(s):

Alexandr Mikyška ◽

Karel Štěrba ◽

Martin Slabý ◽

Vladimír Nesvadba ◽

Jitka Charvátová

Keyword(s):

Essential Oils ◽

Control Sample ◽

Sensory Profile ◽

Humulus Lupulus L ◽

New Varieties ◽

Sensory Impression ◽

Sensory Profiles ◽

The Impact

Characterization of varietal profiles of hop secondary metabolites in beer is of considerable importance for hop growing and brewing. This three-year study focused on pilot brewing tests of three new Saaz derived hop varieties, namely Saaz Brilliant, Saaz Shine and Saaz Comfort. The sensory profiles of kettle and kettle+dry single hopped beers were monitored. At the same time, the impact of dry hopping technology on sensory perception of final beers and changes in volatile compounds was investigated. Pilot brews (200 l) of 12% pale lager were prepared in kettle and kettle+dry variants using the new Czech varieties and traditional Saaz as a control sample. Essential oils in beers were determined by GC/MS-MS method with the aim to clarify links to the beer sensory profile of both, kettle and dry hopping mode. The descriptive sensory method of hop-derived aromas and the triangle tests were employed to determine the sensory quality of beer. The overall sensory impression of beers from all tested varieties was at least comparable to traditional Saaz, and Saaz Comfort even reached better evaluation. The profile of essential oils and hop flavours in beer was partially different, however it was not rated worse than Saaz. The kettle+dry hopped beers of new varieties were significantly different from Saaz in the triangle test, Saaz Brilliant was preferred over the Saaz. The results showed considerable potential of new varieties for the production of interesting and taste-specific beers and the enrichment of the spectrum of fine aroma varieties of Czech hops.

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