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Enhanced entropy generation and heat transfer characteristics of magnetic nano-encapsulated phase change materials in latent heat thermal energy storage systems

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1051-1070页

作者： P.s.REDDY P.sREEDEVI Department of Mathematics Rajeev Gandhi Memorial College of Engineering and TechnologyNandyal 518501India

the objective of the current study is to investigate the importance of entropy generation and thermal radiation on the patterns of velocity,isentropic lines,and temperature contours within a thermal energy storage device filled with magnetic nanoencapsulated phase change materials(NEPCMs).the versatile finite element method(FEM)is implemented to numerically solve the governing *** effects of various parameters,including the viscosity parameter,ranging from 1 to 3,the thermal conductivity parameter,ranging from 1 to 3,the Rayleigh parameter,ranging from 102 to 3×10^(2),the radiation number,ranging from 0.1 to 0.5,the fusion temperature,ranging from 1.0 to 1.2,the volume fraction of NEPCMs,ranging from 2%to 6%,the stefan number,ranging from 1 to 5,the magnetic number,ranging from 0.1 to 0.5,and the irreversibility parameter,ranging from 0.1 to 0.5,are examined in detail on the temperature contours,isentropic lines,heat capacity ratio,and velocity ***,the heat transfer rates at both the cold and hot walls are analyzed,and the findings are presented *** results indicate that the time taken by the NEPCMs to transition from solid to liquid is prolonged inside the chamber region as the fusion temperatureθf ***,the contours of the heat capacity ratio Cr decrease with the increase in the stefan number ste.

关键词： volume fraction of nano-encapsulated phase change material(NEPCM) radiation stefan number heat capacity ratio entropy generation

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Engineering of efficient visible light photocatalysts:ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) compositions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： s.M.Yakout A.M.Youssef Inorganic Chemistry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalysis, widening the wavelengths absorption range of catalysts as well as aborting the recombination of the photoexcited charge carriers(electrons-holes pairs) are of paramount *** the current study, we report the photocatalytic characteristics of four compositions composed of tiO_(2),ti_(0.97)Cu_(0.03)O_(2), ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders for two harmful dyes(Congo red and methylene blue). the X-ray diffraction technique verified the configuration of mixed anatase and rutile phases in pure tiO_(2)and ti_(0.97)Cu_(0.03)O_(2)powders while ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders possess anatase phase only. the changes of the band gap structure and dimensions of the unit cell volume of tiO_(2)confirm the substitution of ti^(4+)sites by Cu^(2+)and La^(3+)ions. Remarkable widening of wavelengths absorption with formation of long absorption tails were found in tiO_(2)(3.13 e V) through insertion of La^(3+)plus Cu^(2+)ions. ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and ti_(0.96)Cu_(0.03)La_(0.01)O_(2)samples exhibit a visible light band gap of 2.3 and 2.7 e V, respectively. Based on sEM images, incorporation of Cu^(2+)and La^(3+)ions influences the surface morphology of tiO_(2). the resulting ti_(0.97)Cu_(0.03)O_(2), ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders present enhanced photocatalytic activity towards Congo red dye degradation compared to pure one under natural solar spectrum. the best ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst exhibits superior photocatalytic activity of 96% for 10 ppm CR dye in 20 min as well as above average photocatalytic efficiency of 63% for 30 ppm CR dye in 120 min. As well, it showed acceptable photodegradation activity of 52% for 30 ppm MB solution in 140 min of sunlight irradiation. the heightened photodegradation efficiency of ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst can be clarified in terms of higher ch

关键词： semiconductor tiO_(2) Rare earths Congo red Methylene blue solar spectrum Photodegradation

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the spectrum of Nail Disorders in Patients with End-stage Renal Disease Undergoing Conservative treatment: A Case-Control study

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International Journal of Dermatology and Venereology 2024年第3期7卷 150-154页

作者： shigidi M.M.t. Department of Internal Medicine College of Medicine Jouf University Al Jouf 72388 Saudi Arabia Nephrology Division Department of Medicine Baraha Medical City North Khartoum State Khartoum 13311 Sudan

Objective: Various nail disorders have been reported in patients with chronic kidney disease. However, few studies have investigated nail disorders in patients with advanced chronic kidney disease. this study focused on nail disorders seen in patients with end-stage renal disease (EsRD) undergoing conservative treatment. Methods: A case-control study was conducted at Baraha Medical City in Khartoum state, sudan. Data on patients with EsRD who were on conservative treatment and presented for follow-up between March and september 2021 were collected. Patients' demographic features, nail findings on clinical examination, and laboratory results were recorded. the obtained data were compared with those on age- and sex-matched healthy individuals from the general population. the chi-square test and student t test were performed to analyze categorical and numerical variables, respectively. Results: Data on 78 patients with EsRD were studied. their mean age was 54.6 ± 17.6 years, and 45 (57.7%) were men. these patients were compared with 129 controls. Nail disorders were seen in 65 (83.3%) EsRD patients and 86 (66.6%) controls (P = 0.009). Patients with EsRD were found to be at increased relative risk of developing a wide spectrum of nail disorders. An absent lunula, half-and-half nails, nail dystrophy, terry's nails, onychomycosis, and koilonychia were the most common disorders and were seen in 44 (56.4%), 13 (16.7%), 10 (12.8%), 9 (11.5%), 6 (7.7%), and 5 (6.4%) patients, respectively. Patients with EsRD had a statistically significant risk of developing above diseases (all P sion: the current study demonstrated a wide spectrum of nail disorders in patients with EsRD undergoing conservative treatment. Further studies are essential to understand their pathogenesis. © 2024 Hospital for skin Diseases (Institute of Dermatology), Chinese Academy of Medical sciences, and Chinese Medical Association, published by Wolters Kluwer, Inc.

关键词： chronic kidney disease disease spectrum end-stage renal disease nail disorders

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Clinical validation of the early embryo viability assessment system: Analysis for the blastocyst morphology and pregnancy outcomes

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Asian pacific Journal of Reproduction 2024年第5期13卷 219-227页

作者： Vu D Hop An M Cuong Phi t t Anh Nguyen t L Huong Le Hoang Nguyen V Hanh Assisted Reproductive technology Centre Tam Anh General HospitalHanoiVietnam Institute of Biotechnology Vietnam Academy of Science and TechnologyHanoiVietnam

Objective:to determine the relationship between the early embryo viability assessment(EEVA)and blastocyst morphological parameters and pregnancy ***:this retrospective cohort study was conducted on 291 intracytoplasmic sperm injection cycles including 2522 embryos with indications of prolonging embryo culture to the blastocyst stage in the Genea embryo review incubator,and 511 single vitrified-warmed blastocyst transfer cycles from January 2020 to June *** EEVA system produced an EEVA score from E1(best)to E5(worse)for the potential of blastocyst *** morphology was *** association between the EEVA score and each type of blastocyst morphology,implantation rate,clinical pregnancy,and ongoing pregnancy were assessed using generalized estimating ***:the inner cell mass A(ICM A),trophectoderm A(tE A),blastocoele expansion degree of 3,4,5,6,7 rates were higher with lower the EEVA *** adjusted odd ratio(aOR)(E5 vs E1)was 0.3 for ICM A,0.174 for tE A and 0.210 for BL3,4,5,6,7(all Psuggesting a significant association between lower EEVA scores and improved embryo *** implantation,clinical pregnancy,and ongoing pregnancy rate were also higher with lower the EEVA *** aOR of E5 vs E1 was 0.245 for implantation,0.185 for clinical pregnancy and 0.200 for ongoing pregnancy rate(Psions:there were associations between blastocyst morphology,pregnancy outcome and EEVA *** good blastocyst morphology and pregnancy outcomes are higher with lower the EEVA score.

关键词： Automated embryo assessment Blastocyst Early embryo viability assessment Genea embryo review incubator

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Mathematical modeling and simulations of stress mitigation by coating polycrystalline particles in lithium-ion batteries

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL J.CHOI s.F.sHAH C.LEE s.LEE Department of Mechanical Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A chemo-mechanical model is developed to investigate the effects on the stress development of the coating of polycrystalline Ni-rich LiNixMnyCo_(z)O_(2)(x≥0.8)(NMC)particles with poly(3,4-ethylenedioxythiophene)(PEDOt).the simulation results show that the coating of primary NMC particles significantly reduces the stress generation by efficiently accommodating the volume change associated with the lithium diffusion,and the coating layer plays roles both as a cushion against the volume change and a channel for the lithium transport,promoting the lithium distribution across the secondary particles more ***,the lower stiffness,higher ionic conductivity,and larger thickness of the coating layer improve the stress *** paper provides a mathematical framework for calculating the chemo-mechanical responses of anisotropic electrode materials and fundamental insights into how the coating of NMC active particles mitigates stress levels.

关键词： lithium-ion battery(LIB) polycrystalline particle coating finite element simulation Ni-rich LiNixMnyCo_(z)O_(2)(x>0.8)(NMC)

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