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Analysis of periodic and aperiodic convective stability of double diffusive nanofluid convection in rotating porous layer

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Applied Mathematics and Mechanics(english edition) 2016年第2期37卷 215-226页

作者： s.AGARWAL P.RANA Department of Mathematics Amity Institute of Applied SciencesAmity University Department of Mathematics Jaypee Institute of Information Technology

The onset of periodic and aperiodic convection in a binary nanofiuid satu- rated rotating porous layer is studied considering constant flux boundary conditions. The porous medium obeys Darcy＇s law, while the nanofluid envisages the effects of the Brow- nian motion and thermophoresis. The Rayleigh numbers for stationary and oscillatory convection are obtained in terms of various non-dimensional parameters. The effect of the involved physical parameters on the aperiodic convection is studied graphicMly. The results are validated in comparison with the published literature in limiting cases of the present study.

关键词： nanofluid rotating porous medium natural convection thermophoreticflux

strategies to improve regenerative potential of mesenchymal stem cells

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World Journal of stem Cells 2021年第12期13卷 1845-1862页

作者： Mahmood s Choudhery Department of Biomedical sciences King Edward Medical UniversityLahore 54000PunjabPakistan Department of Genetics and Molecular Biology University of Health SciencesLahore 54600PunjabPakistan

In the last few decades,stem cell-based therapies have gained attention worldwide for various diseases and *** stem cells,particularly mesenchymal stem cells(MsCs),are preferred due to their significant regenerative potential in cellular therapies and are currently involved in hundreds of clinical *** MsCs have high self-renewal as well as differentiation potential,such abilities are compromised with“advanced age”and“disease status”of the ***,cell-based therapies require high cell number for clinical applications that often require in vitro expansion of *** is pertinent to note that aged individuals are the main segment of population for stem cell-based therapies,however;autologous use of stem cells for such patients(aged and diseased)does not seem to give optimal results due to their compromised *** vitro expansion to obtain large numbers of cells also negatively affects the regenerative potential of *** is therefore essential to improve the regenerative potential of stem cells compromised due to“in vitro expansion”,“donor age”and“donor disease status”for their successful autologous *** current review has been organized to address the age and disease depleted function of resident adult stem cells,and the strategies to improve their *** combat the problem of decline in the regenerative potential of cells,this review focuses on the strategies that manipulate the cell environment such as hypoxia,heat shock,caloric restriction and preconditioning with different factors.

关键词： Hypoxia stem cell aging Growth factors Heat shock Caloric restriction

Propofol use in endoscopic retrograde cholangiopancreatography and endoscopic ultrasound

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World Journal of Gastroenterology 2014年第18期20卷 5171-5176页

作者： Danny G Cheriyan Michael f Byrne Department of Gastroenterology University of British ColumbiaVancouver General HospitalVancouverBC V5Z 1M9Canada

Compared to standard endoscopy,endoscopic retrograde cholangiopancreatography(eRCP)and endoscopic ultrasound(eUs)are often lengthier and more complex,thus requiring higher doses of sedatives for patient comfort and *** aim of this review is to provide the reader with information regarding the use,safety profile,and merits of propofol for sedation in advanced endoscopic procedures like eRCP and eUs,based on the current literature.

关键词： Propofol endoscopy Ndoscopic retrograde cholangiopancreatography endoscopic ultrasound safety

Deriving Ag_3PO_4–CaO composite as a stable and solar light photocatalyst for efficient ammonia degradation from wastewater

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Journal of energy Chemistry 2018年第1期27卷 290-299页

作者： Y.shaveisi s.sharifnia Catalyst Research Center Chem.Eng.Dept.Razi UniversityKermanshah 67149-67246lran

A novel Ag3PO4-CaO composite photocatalyst with enhanced photocatalytic activity was synthesized and utilized for degradation of ammonia from aqueous solution under sunlight. Ag3PO4 was prepared by pre- cipitation method, and the composite of AgjPO4-CaO was prepared via impregnation method. Utilization of eggshell for CaO synthesis provided a cost-effective and environmental friendly way for the hetero- geneous catalyst production. The as-prepared photocatalysts were characterized by fT-IR, fe-seM, TeM, eDX, UV-vis and PL Results show that the Ag3PO4-CaO samples have excellent photocatalytic perfor- mances in the wide visible-light region. The effect of operating parameters like the content of Ag3PO4 in composite, initial ammonia concentration, pH of solution, catalyst dosage and oxygen supply was investi- gated. The photoeatalyst with 60 wt% content of Ag3PO4 had a high photocatalytic performance, because a low content of Ag3PO4 causes weak light absorption, and the excess amount of it results in serious electron-hole recombination due to the aggregation of AgjPO4 particles. The maximum ammonia degra- dation （about 70%） was achieved in 340 mg/L of ammonia, pH 11, and 1.25 g/L of catalyst in the presence of pure oxygen. In comparison to Ag3PO4, 60 wt% AgjPO4-CaO had a good stability and it could have been easily separated from the solution for recycling.

关键词： Photocatalyst Ag3PO4 CaO Ammonia degradation sunlight

An analytical and numerical study of peristaltic transport of a Johnson-segalman fluid in an endoscope

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Chinese Physics B 2013年第1期22卷 374-383页

作者： Noreen sher Akbar s. Nadeem DBs&H CEME National University of Sciences and Technology Islamabad Pakistan Department of Mathematics Quaid-i-Azam University 45320 Islamabad 44000 Pakistan

In the present study, we discuss the peristaltic flow of a Johnson-segalman fluid in an endoscope. Perturbation, homotopy, and numerical solutions are found for the non-linear differential equation. The comparative study is also made to check the validity of the solutions. The expressions for pressure rise frictional forces, pressure gradient, and stream lines are presented to interpret the behavior of various physical quantities of the Johnson-segalman fluid.

关键词： peristaltic pumping Johnson-segalman fluid endoscope

Viscosity of aqueous ionic liquids analogues as a function of water content and temperature

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Chinese Journal of Chemical engineering 2017年第12期25卷 1877-1883页

作者： farouq s. Mjalli Hasan Mousa Petroleum and Chemical engineering Department Sultan Qaboos University Oman Department of Chemical engineering Jordan University of science and Technology Irbid 22110 Box 3030 Jordan

Ionic liquids analogues known as Deep eutectic solvents （Dess） are gaining a surge of interest by the scientific community, and many applications involving Dess have been realized. Moisture content is one of the important factors that affects the physical and chemical characteristics of these fluids. In this work, the effect of mixing water with three common type III Dess on their viscosity was investigated within the water tool fraction range of （0-1） and at the temperature range （298.15-353.15 K）. similar trends of viscosity variation with respect to molar composition and temperature were observed for the three studied systems, Due to the asymmetric geometry of the constituting molecules in these fluids, their viscosity could not be modeled effectively by the conventional Grunberg and Nissan model, and the fang-He model was used to address this issue with excellent performance. All studied aqueous Des mixtures showed negative deviation in viscosity as compared to ideal mixtures, The degree of intermolecular interactions with water reaches a maximum at a composition of 30% aqueous Des solution. Reline, the most studied Des in the literature, showed the highest deviation. The informa- tion presented in this work on the viscosity of aqueous Des solutions may serve in tuning this important property for diverse industrial applications involving these novel fluids in fluid flow, chemical reactions, liquid-liquid separation and many more.

关键词： eutectic Ionic liquids Viscosity Interaction Prediction Des

施肥对湿地松干形生长相关及产量估测的长期影响

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湖南林业科技 1991年第2期18卷 50-53页

作者： e. f. Jokela 杨柳青

施肥是美国东南方常用的一种提高森林生产率的营林措施。至1987年,几乎有50万公顷的火炬松和30万公顷的湿地松都施了肥。肥料对树干生长的反应,一般应用与树木大小有关的材积和重量常规回归方程进行估测。在很多时候,这些方程不考虑树... 详细信息

施肥是美国东南方常用的一种提高森林生产率的营林措施。至1987年,几乎有50万公顷的火炬松和30万公顷的湿地松都施了肥。肥料对树干生长的反应,一般应用与树木大小有关的材积和重量常规回归方程进行估测。在很多时候,这些方程不考虑树形。因此,如果肥料对树干各部分的生长有着不同的分布作用,这些方程就可能导致估测不精确。控制树干形状发育的因素已被作为一个重要的题材进行研究。争论的结果认为可能包含了许乡复杂的相互作用。例如。

关键词：湿地松干形生长产量估测施肥

effect of Rare earth and Transition Metal elements on the Glass forming Ability of Mechanical Alloyed Al–TM–Re Based Amorphous Alloys

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Journal of Materials science & Technology 2015年第11期31卷 1118-1124页

作者： Ram s.Maurya Tapas Laha Department of Metallurgical & Materials engineering Indian Institute of Technology Kharagpur

The present work aims to compare the amorphous phase forming ability of ternary and quaternary Al based alloys （Al86Ni8Y6, Al86GNi6Y6Co2, Al86NigLa6 and Al86Ni8Y45La15） synthesized via mechanical alloying by varying the composition, i.e. fully or partially replacing rare earth （Re） and transition metal （TM） elements based on similar atomic radii and coordination number. X-ray diffraction and high resolution transmission electron microscopy study revealed that the amorphization process occurred through formation of various intermetallic phases and nanocrystalline fCC Al. fully amorphous phase was obtained for the alloys not containing lanthanum, whereas the other alloys containing La showed partial amorphization with reappearance of intermetallic phases attributed to mechanical crystallization. Differential scanning calorimetry study confirmed better thermal stability with wider transformation temperature for the alloys without La.

关键词： Al-TM-Re amorphous alloy Mechanical alloying Glass forming ability Microstructural transformation Intermetallics Glass transition temperature

(In) consistency of air/sea heat flux estimates,ocean heat uptake anomalies and top of atmosphere radiation budgets

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engineering sciences 2014年第2期12卷 29-35,40页

作者： Drijfhout sybren s Trenberth Kevin e Large William G National Oceanography Centre National Center for Atmospheric Research

This paper introduces the consistency between top of atmosphere(TOA) imbalances and ocean heat uptake,and the inconsistency between ocean heat uptake estimates and flux climatologies,and then gives some recommendation... 详细信息

关键词： heat flux ocean heat uptake radiation budget