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Peristaltic flow of couple stress fluid through uniform porous medium

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Applied Mathematics and Mechanics(English Edition) 2014年第4期35卷 469-480页

作者： A.ALSAEDI N.ALI D.tripathi T.HAYAT Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Faculty of ScienceKing Abdulaziz University Department of Mathematics & Statistics International Islamic University Department of Applied Mathematics IT-BHU Department of Mathematics Quaid-i-Azam University

Investigation concerning peristaltic motion of couple stress fluid is made. An incompressible couple stress fluid occupies the porous medium. Mathematical anal- ysis is presented through large wavelength and low Reynolds number. Exact analytical expressions of axial velocity, volume flow rate, pressure gradient, and stream function are calculated as a function of couple stress parameter. The essential feature of the analysis is a full description of influence of couple stress parameter and permeability parameter on the pressure, frictional force, mechanical efficiency, and trapping.

关键词： peristalsis couple stress fluid porous medium mechanical efficiency,trapping

Advanced glycation end products:Key mediator and therapeutic target of cardiovascular complications in diabetes

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World Journal of Diabetes 2023年第8期14卷 1146-1162页

作者： Savita Bansal Archana Burman Asok Kumar tripathi Department of Biochemistry Institute of Home SciencesUniversity of DelhiNew Delhi 110016India Department of Biochemistry Institute of Home EconomicsUniversity of DelhiNew Delhi 110016India Department of Biochemistry University College of Medical SciencesUniversity of DelhiNew Delhi 110095India

The incidence of type 2 diabetes mellitus is growing in epidemic proportions and has become one of the most critical public health *** complications associated with diabetes are the leading cause of morbidity and *** cardiovascular diseases that accompany diabetes include angina,myocardial infarction,stroke,peripheral artery disease,and congestive heart *** the various risk factors generated secondary to hyperglycemic situations,advanced glycation end products(AGEs)are one of the important targets for future diagnosis and prevention of *** the last decade,AGEs have drawn a lot of attention due to their involvement in diabetic *** can be derived exogenously and endogenously through various *** are a nonhomogeneous,chemically diverse group of compounds formed nonenzymatically by condensation between carbonyl groups of reducing sugars and free amino groups of protein,lipids,and nucleic *** mediate their pathological effects at the cellular and extracellular levels by multiple *** the cellular level,they activate signaling cascades via the receptor for AGEs and initiate a complex series of intracellular signaling resulting in reactive oxygen species generation,inflammation,cellular proliferation,and fibrosis that may possibly exacerbate the damaging effects on cardiac functions in *** also cause covalent modifications and cross-linking of serum and extracellular matrix proteins;altering their structure,stability,and *** diagnosis of diabetes may prevent its progression to complications and decrease its associated *** the present review,we recapitulate the role of AGEs as a crucial mediator of hyperglycemia-mediated detrimental effects in diabetes-associated ***,this review presents an overview of future perspectives for new therapeutic interventions to ameliorate cardiovascular complications in diabetes.

关键词： Type 2 diabetes mellitus Cardiovascular complications Hyperglycemia Advanced glycation end products Reactive oxygen species Oxidative stress Endothelial cells Receptor of advanced glycation end products Anti-advanced glycation end products strategies

A role of computer vision in fruits and vegetables among various horticulture products of agriculture fields: A survey

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Information Processing in Agriculture 2020年第2期7卷 183-203页

作者： Mukesh Kumar tripathi Dr.Dhananjay D.Maktedar Department of CSE Guru Nanak Dev Engineering CollegeBidarKarnatakaIndia

Computer vision is a consistent and advanced technique for image processing,with the propitious outcome,and enormous potential.A computer vision has been strongly adopted in the heterogeneous domain including *** the study of existing research on the role of computer vision in fruits and vegetables among various horticulture products of agriculture fields it is noticed that,the existing survey paper has not focused properly on mathematical framework,feature descriptor,defect detection on multiple datasets of fruits and vegetables *** has motivated us to undertake an extensive *** this paper,we examine the paper broadly related to fruits and vegetables among various horticulture products of agriculture fields,specific model,data pre-processing,data analysis method and overall value of performance accuracy by using a particular performance ***,we study the different type of disease present in various fruit and *** have also focused on the comparison of different machine learning approach with respect to different performance metrics on the same ***,we have found that among all existing machine learning techniques SVM give better classification accuracy.A generalized framework to grade the quality and defect detection of multiple fruits and vegetables is also proposed in this *** paper covers the survey of ninety-eight papers closely related to computer vision in the agricultural *** the survey,we have found that computer vision plays an important role and has a large potential to address the challenges related to the agricultural fields.

关键词： Computer vision Agriculture Survey Pre-processing Descriptor Data-analysis Defect detection Monitoring

Stokes flow of micro-polar fluids by peristaltic pumping through tube with slip boundary condition

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Applied Mathematics and Mechanics(English Edition) 2011年第12期32卷 1587-1598页

作者： D.tripathi M.K.CHAUBE P.K.GUPTA Department of Mathematics Indian Institute of Technology Ropar Punjab 140001 India Department of Mathematics Raj Kumar Goel Institute of Technology Ghaziabad 201001 India Department of Applied Mathematics Institute of Technology Banaras Hindu University Varanasi 221005 India

This paper studies the Stokes flow of micro-polar fluids by peristaltic pumping through the cylindrical tube under the effect of the slip boundary condition. The motion of the wall is governed by the sinusoidal wave equation. The analytical and numerical solutions for the axial velocity, the micro-polar vector, the stream function, the pressure gradient, the friction force, and the mechanical efficiency are obtained by using the lu- brication theory under the low Reynolds number and long wavelength approximations. The impacts of the emerging parameters, such as the coupling number, the micro-polar parameter, the slip parameter on pumping characteristics, the friction force, the velocity profile, the mechanical efficiency, and the trapping phenomenon are depicted graphically. The numerical results infer that large pressure is required for peristaltic pumping when the coupling number is large, while opposite behaviors are found for the micro-polar parameter and the slip parameter. The size of the trapped bolus reduces with the increase in the coupling number and the micro-polar parameter, whereas it blows up with the increase in the slip parameter.

关键词： Stokes flow slip boundary condition mechanical efficiency micro-polarfluid peristaltic pumping trapping

Enzymatic and Ultrastructural Studies in a Freshwater Catfish: Impact of Methyl Parathion

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Biomedical and Environmental Sciences 1990年第2期3卷 166-182页

作者： G.tripathi S.P.SHUKLA Department of Zoology Banaras Hindu University Varanasi 221005 India

Exposure to a sublethal concentration of methyl parathion (MEP) reduced the activity of cytoplasmic malate dehydrogenase. mitochondrial malate dehydrogenase, and lactate dehydrogenase by 30 to 49% in the liver and the skeletal muscle of the freshwater catfish, Clarias batraclms, after 7 days. The activities then began to recover and reached the control levels on the 28th day of MEP exposure. A complete recovery occurred on the 7th day when MEP was withdrawn from the medium after an exposure for 1 week. The withdrawal-dependent recovery in the activities was inhibited partially or completely by actinomycin Dandcycloheximide, suggesting de nova synthesis of the enzymes during the recovery period. A conjoint treatment of MEP and triiodolhyronine (T_3) restored the activities to control levels, indicating T_3 protection against the pesticide toxicity. SDS-PAGE of the cytoplasmic fraction of the liver showed some noticeable changes in the protein pattern after an exposure to MEP. Ultrastructural studies on MEP-treated liver cells showed disappearance of the glycogen granules and appearance of numerous smooth endoplasmic reticulum, lysosomal dense bodies, and swollen mitochondria. These changes in the liver are an indication of hepatic toxicity leading toward necrosis.(c) 1990 Academic ***.

关键词： Enzymatic and Ultrastructural Studies in a Freshwater Catfish MEP

Fabrication and Characterization of Electrodeposited Ni-SiC-h/BN Composite Coatings

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Journal of Materials Science & Technology 2014年第8期30卷 796-802页

作者： Gobinda Gyawali Hyung-Suk Kim Khagendra tripathi Tae-Ho Kim Soo Wohn Lee Research Center for Eco-Multifunctional Nano Materials Sun Moon UniversityAsanRepublic of Korea Department of Environmental Engineering Sun Moon UniversityChungnam 336-708Republic of Korea

Ni—SiC—h/BN composite materials were prepared by electrodeposition technique with the dispersion of SiC（10 g/L） and h/BN nanosheets（10 g/L） in a nickel sulfamate electrolytic *** ratio of sodium dodecyl sulfate（SDS） and cetyltrymethyl ammonium bromide（CTAB） surfactants were used to evaluate the effect of surfactants on the properties of the electrodeposited composite *** coating samples were characterized by scanning electron microscopy,X-ray diffraction,Vickers microhardness test,scratch and tribology *** results revealed that the co-deposition of nanoparticles was significantly influenced by surfactants during electrodeposition *** or polyhedral nickel crystallites were observed at higher ratio of SDS/CTAB while smaller oval grains with refined surface morphologies were obtained at lower ratio of SDS/CTAB *** addition,wt%of particles co-deposition was increased,and Vickers microhardness,wear and coefficient of friction of the electrodeposited composite coatings were improved at increased CTAB and decreased SDS contents in the electrolyte during electrodeposition process.

关键词： Ni-SiC-h/BN Composite coating Surfactant Microstructure Scratch Wear

Grinding analysis of Indian coal using response surface methodology

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International Journal of Coal Science & Technology 2016年第2期3卷 184-190页

作者： Twinkle Singh Aishwarya Awasthi Pranjal tripathi Shina Gautam Alok Gautam Jaypee University of Engineering & Technology A-B RoadRaghogarh Guna India Shroff S. R. Rotary Institute of Chemical Technology Ankleshwar Gujarat India

The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to the experiments done according to the model requirement. Three parameters ball charge （numbers 10-20）, coal content （100-200 g） and the grinding time （4-8 rain） were chosen for the experiments as well as for the modeling work. Coal fineness is defined as the dso （80 % passing size）. A quadratic model was developed to show the effect of parameters and their interaction with fineness of the product. Three different sizes （4, 1 and 0.65 mm） of Indian coal were used. The model equations for each fraction were developed and different sets of experiments were performed. The predicted values of the fineness of coal were in good agreement with the experimental results （R2 values of dso varies between 0.97 and 0.99）. Fine size of three different coal sizes were obtained with larger ball charge with less grinding time and less solid content. This work represents the efficient use of response surface methodology and the Box-Behnken design use for grinding of Indian coal.

关键词： Coal grinding Ball mill Grinding time Response surface methodology

Global Dynamics of a Multi-group SEIR Epidemic Model with Infection Age

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Chinese Annals of Mathematics,Series B 2021年第6期42卷 833-860页

作者： Vijay Pal BAJIYA Jai Prakash tripathi Vipul KAKKAR Jinshan WANG Guiquan SUN Department of Mathematics Central University of RajasthanBandar Sindri-305817KishangarhAjmerRajasthanIndia Complex Systems Research Center Shanxi UniversityTaiyuan 030006China Department of Mathematics North University of ChinaTaiyuan 030051China Complex Systems Research Center Shanxi UniversityTaiyuan 030006China.

Consider the heterogeneity(e.g.,heterogeneous social behaviour,heterogeneity due to different geography,contrasting contact patterns and different numbers of sexual partners etc.)of host population,in this paper,the authors propose an infection age multigroup SEIR epidemic *** model system also incorporates the feedback variables,where the infectivity of infected individuals may depend on the infection *** the direction of mathematical analysis of model,the basic reproduction number R_0 has been *** global stability of disease-free equilibrium and endemic equilibrium have been established in the term of R_(0).More precisely,for R_(0)≤1,the disease-free equilibrium is globally asymptotically stable and for R_(0)>1,they establish global stability of endemic equilibrium using some graph theoretic techniques to Lyapunov function *** considering a numerical example,they investigate the effects of infection age and feedback on the prevalence of the *** result shows that feedback parameters have different and even opposite effects on different ***,by choosing an appropriate value of feedback parameters,the disease could be eradicated or maintained at endemic ***,the infection age of infected individuals may also change the behaviour of the disease,global stable to damped oscillations or damped oscillations to global stable.

关键词： Multi-group model Infection age Feedback Graph-theoretic approach Lyapunov function

Natural history and management of liver dysfunction in lysosomal storage disorders

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World Journal of Hepatology 2022年第10期14卷 1844-1861页

作者： Moinak Sen Sarma Parijat Ram tripathi Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014India Department of Pediatric Gastroenterology Ankura Hospital for Women and ChildrenHyderabad 500072India

Lysosomal storage disorders(LSD)are a rare group of genetic *** major LSDs that cause liver dysfunction are disorders of sphingolipid lipid storage[Gaucher disease(GD)and Niemann-Pick disease]and lysosomal acid lipase deficiency[cholesteryl ester storage disease and Wolman disease(WD)].These diseases can cause significant liver problems ranging from asymptomatic hepatomegaly to cirrhosis and portal *** storage cells initiate hepatic fibrosis in sphingolipid *** causes micronodular cirrhosis in lipid storage *** disorders must be keenly differentiated from other chronic liver diseases and non-alcoholic steatohepatitis that affect children and young ***,Niemann-Pick type C,and WD also cause neonatal cholestasis and infantile liver *** and liver phenotype correlation is variable in these *** with LSD may survive up to 4-5 decades except for those with neonatal onset *** diagnosis of all LSD is based on enzymatic activity,tissue histology,and genetic *** replacement is possible in GD and Niemann-Pick types A and B though there are major limitations in the *** that progress invariably require liver transplantation with variable *** prognosis of Niemann-Pick type C and WD is universally *** replacement therapy has a promising role in cholesteryl ester storage *** review attempts to outline the natural history of these disorders from a hepatologist’s perspective to increase awareness and facilitate better management of these rare disorders.

关键词： Lysosomal Gaucher Niemann-Pick Wolman Cholesteryl ester Children