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Low Thrust Minimum Time Orbit Transfer Nonlinear Optimization Using Impulse Discretization via the Modified Picard–Chebyshev Method

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Computer Modeling in Engineering & Sciences 2016年第1期111卷 1-27页

作者： Darin koblick Shujing Xu Joshua Fogel Praveen shankar California State University-Long Beach CAUSA. Millennium Space Systems Inc. El SegundoCAUSA. Claremont Graduate University CAUSA. University of California-San Diego CAUSA. University of Southern California Los AngelesCAUSA.

The Modified Picard-Chebyshev Method(MPCM)is implemented as an orbit propagation solver for a numerical optimization method that determines minimum time orbit transfer trajectory of a satellite using a series of multiple impulses at intermediate *** waypoints correspond to instantaneous impulses that are determined using a nonlinear constrained optimization routine,SNOPT with numerical force models for both Two-Body and J2 *** is found that using the MPCM increases run-time performance of the discretized lowthrust optimization method when compared to other sequential numerical solvers,such as Adams-Bashforth-Moulton and Gauss-Jackson 8th order methods.

关键词： Low Thrust Picard–Chebyshev Optimization Multi-Impulse Boundary Value Problem.

Unusual case of a free anterolateral thigh flap partial necrosis in a COVID-19 positive young male following extremity reconstruction

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Chinese Journal of Traumatology 2023年第5期26卷 308-310页

作者： Sourabh shankar Chakraborty Anjana Malhotra Urvi Ashok Shah Shylesh Ramesh Babu Puja Bhaurao Dandekar Doddi Avinash kumar Chindarkar Himanshu Prakash Department of Burn&Plastic Surgery All India Institute of Medical SciencesKalyaniWest Bengal741245India Department of Plastic Surgery South Eastern Railway Central HospitalKolkataWest Bengal700043India

Free flap procedure provides an overall success rate of 97%, which decreases to 85% in hypercoagulable states. COVID-19, as a pro-thrombotic disorder, therefore seems detrimental to free flap survival. We encountered a case of unique pattern of free flap partial failure in a young male who underwent extremity reconstruction. The patient was diagnosed as COVID-19 positive on the 3rd day post-reconstruction. The flap survived well for the first 7 days post-operatively, but gradually the skin got necrosed and the subcutaneous fat layer was preserved when debriding. To our knowledge, this is the only case in which the skin of the free flap of a COVID-19 positive patient was necrosed almost entirely subsequently, while the subcutaneous fat was relatively preserved.

关键词： COVID-19 Free anterolateral thigh flap Partial flap failure Freeflapcomplication

Soft sensor design for hydrodesulfurization process using support vector regression based on WT and PCA

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Journal of Central South University 2015年第2期22卷 511-521页

作者： Saeid Shokri Mohammad Taghi Sadeghi Mahdi Ahmadi Marvast shankar Narasimhan Department of Chemical Engineering Iran University of Science and Technology (IUST) Tehran 16765?163 Iran Process & Equipment Technology Development Division Research Institute of Petroleum Industry (RIPI) Tehran 14665?137 Iran Department of Chemical Engineering IIT Madras Chennai 600036 India

A novel method for developing a reliable data driven soft sensor to improve the prediction accuracy of sulfur content in hydrodesulfurization(HDS) process was proposed. Therefore, an integrated approach using support vector regression(SVR) based on wavelet transform(WT) and principal component analysis(PCA) was used. Experimental data from the HDS setup were employed to validate the proposed model. The results reveal that the integrated WT-PCA with SVR model was able to increase the prediction accuracy of SVR model. Implementation of the proposed model delivers the best satisfactory predicting performance(EAARE=0.058 and R2=0.97) in comparison with SVR. The obtained results indicate that the proposed model is more reliable and more precise than the multiple linear regression(MLR), SVR and PCA-SVR.

关键词：加氢脱硫工艺支持向量回归 PCA 传感器设计 WT 预测精度多元线性回归主成分分析

Bifurcation phenomena and control for magnetohydrodynamic flows in a smooth expanded channel

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Chinese Physics B 2014年第11期23卷 374-383页

作者： G.C.Layek Mani shankar Mandal H.A.khalaf Department of Mathematics The University of Burdwan Department of Mathematics Krishnagar Govt. College KrishnagarNadia 741101India Thi-Qar University Marshes Research Center Thi-QarIraq

This work reports the effects of magnetic field on an electrically conducting fluid with low electrical conductivity flowing in a smooth expanded channel. The governing nonlinear magnetohydrodynamic （MHD） equations in induction- free situations are derived in the framework of MHD approximations and solved numerically using the finite-difference technique. The critical values of Reynolds number （based on upstream mean velocity and channel height） for symmetry breaking bifurcation for a sudden expansion channel （1：4） is about 36, whereas the value in the case of the smooth expansion geometry used in this work is obtained as 298, approximately （non-magnetic case）. The flow of an electrically conducting fluid in the presence of an externally applied constant magnetic field perpendicular to the plane of the flow is reduced significantly depending on the magnetic parameter （M）. It is expansion （1：4） is about 475 for the magnetic parameter M found that the critical value of Reynolds number for smooth = 2. The separating regions developed behind the smooth symmetric expansion are decreased in length for increasing values of the magnetic parameter. The bifurcation diagram is shown for a symmetric smoothly expanding channel. It is noted that the critical values of Reynolds number increase with increasing magnetic field strength.

关键词： weakly electrically conducting fluid flow bifurcation asymmetric flow smooth expansion

Effect of Digital and Financial Awareness of Household Womens on the Use of Fin-Tech in India: Observing the Relation with (Utaut) Model

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Journal of Sustainable Business and Economics 2022年第3期5卷 18-26页

作者： Uma shankar Yadav Ravindra Tripathi Mano Ashish Tripathi Department of Humanities and Social Sciences Motilal Nehru National Institute of Technology AllahabadPrayagrajIndia

Era of COVID-19 resulted in contactless transactions and extensive use of technological *** was the case of Fin-Tech which has extensively been used by consumers all around the globe for making transactions and other financial and economic *** there is a lack of research to reflect these forms of evidence from the developing as well as Indian sides of the *** the other side,some studies indicated the Unified Household Acceptance and Use of Technology(UTAUT)model as the base to prefer mobile methods of transaction and Fin-Tech *** this paper has been developed systematically to relate the financial literacy of household females from Generation Y with the use of Fin-Tech during the eve of *** devising this relationship research has been induced with the UTAUT model and data have been collected from married household females between twenty-four to thirty-five years of *** were analyzed through SMART-PLS which highlighted the financial literacy of Indian household females has a significant association with UTAUT ***,the entire UTAUT model does not have a significant relationship with the use of Fin-Tech.

关键词： SMART-PLS Fin-Tech COVID-19 Household females UTAUT model&financial awareness

Numerical simulation of physiologically relevant pulsatile flow of blood with shear-rate-dependent viscosity in a stenosed blood vessel

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International Journal of Biomathematics 2018年第6期11卷 129-150页

作者： Subrata Mukhopadhyay Mani shankar Mandal Swati Mukhopadhyay Department of MathematicsAcharya P. C. Roy Govt. College Siliguri W.B. India Department of MathematicsG.G.D. C at kalna-I Purba Bardhaman-713405 W.B. India Department of MathematicsThe University of Burdwan Burdwan-713104 W.B. India

Pulsatile flow of blood in a blood vessel having time-dependent shape (diameter) is investigated numerically in order to understand some important physiological phenomena in arteries. A smooth axi-symmetric cosine shaped constriction is considered. To mimic the realistic situation as far as possible, viscosity of blood is taken to be non-uniform, a shear-thinning viscosity model is considered and a physiologically relevant pulsatile flow is introduced. Taking advantage of axi-symmetry in the proposed problem, the stream function–vorticity formulation is used to solve the governing equations for blood flow. Effect of different parameters associated with the problem on the flow pattern has been investigated and disparities from the Newtonian case are discussed in detail.

关键词：流动模式粘性模型数字模拟脉动生理容器狭窄时间依赖

Band-gap engineering of La1-xNdxAlO3(x = 0,0.25,0.50,0.75,1)perovskite using density functional theory：A modified Becke Johnson potential study

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Chinese Physics B 2016年第6期25卷 376-382页

作者： Sandeep D P Rai A shankar M P Ghimire Anup Pradhan Sakhya T P Sinha R khenata S Bin Omran R k Thapa Department of Physics Mizoram University Aizawl-796004 India Department of Physics Pachhunga University College Aizawl-796001 India Department of Physics University of North Bengal Darjeeling-734013 India IFW Dresden e. V. P. O. Box 270116 D-01171 Dresden Germany Department of Physics Bose Institute 93/1 Acharya Prafulla Chandra Road Kolkata 700009 India Laboratoire de Physique Quantique et de Modelisation Mathematique (LPQ3M) Department de Technologie Universite de Mascara 29000 Mascara Algerie Algeria Department of Physics and Astronomy College of Science King Saud University P. O: Box 2455 Riyadh 11451 Saudi Arabia

The structural,electronic,and magnetic properties of the Nd-doped Rare earth aluminate,La1-xNdxAlO3（x = 0%to 100%） alloys are studied using the full potential linearized augmented plane wave（FP-LAPW） method within the density functional *** effects of the Nd substitution in La AlO3 are studied using the supercell *** computed electronic structure with the modified Becke–Johnson（m BJ） potential based approximation indicates that the La1-xNdxAlO3 alloys may possess half-metallic（HM） behaviors when doped with Nd of a finite density of states at the Fermi level（EF）.The direct and indirect band gaps are studied each as a function of x which is the concentration of Nddoped La *** calculated magnetic moments in the La1-xNdxAlO3 alloys are found to arise mainly from the Nd-4f state.A probable half-metallic nature is suggested for each of these systems with supportive integral magnetic moments and highly spin-polarized electronic structures in these doped systems at *** observed decrease of the band gap with the increase in the concentration of Nd doping in La AlO3 is a suitable technique for harnessing useful spintronic and magnetic devices.

关键词： density functional theory rare earth aluminates perovskites electronic structures

Role of Complementary and Alternative Medicine in Prevention and Treatment of COVID-19:An Overhyped Hope

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Chinese Journal of Integrative Medicine 2020年第8期26卷 565-567页

作者： Abhishek.shankar Anusha Dubey Deepak Saini Chandra Prakash Prasad Department of Radiation Oncology Lady Hardinge Medical College and SSK HospitalDelhi 110001India Division of Cancer Control and Prevention Indian Society of Clinical OncologyDelhi 110049India Department of Medical Oncology(Lab) Dr BR Ambedkar Institute Rotary Cancer HospitalAll India Institute of Medical SciencesDelhi 110029India

The entire mankind across the globe is suffering with COVID-19 outbreak and searching for definite vaccine or treatment for *** country is trying hard to get a breakthrough for definitive therapy in the form of antiviral therapy,plasma therapy and vaccine against this virus,as current management is symptom directed *** of the countries are also trying complementary and alternative medicine(CAM),including traditional,Herbal treatment,alone or in combination with standard management.

关键词： vaccine breakthrough treatment

Detoxication and Theranostic Aspects of Biosynthesised Zinc Oxide Nanoparticles for Drug Delivery

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 729-740页

作者： krishnaswamy kanagamani Pitchaipillai Muthukrishnan Ayyasami kathiresan karikalan shankar Pandurengan Sakthivel Murugan Ilayaraja Department of Chemistry SNS College of TechnologyCoimbatore641035India Department of Chemistry Faculty of EngineeringKarpagam Academy of Higher EducationCoimbatore641021India Department of Physics Faculty of EngineeringKarpagam Academy of Higher EducationCoimbatore641021India Department of Chemistry Arumugam Pillai Seethai Ammal CollegeTirupattur630211India

Bioactive materials obtained from plant bio-resources offer immense attention for development and production of nanotechnology enabled products for biomedical *** the present study,Ficus hispida leaf extract(FHLE)was used as a stabilising agent for the environmentally benign synthesis of zinc oxide nanoparticles(ZnO-NPs)which were investigated for prospective versatile applications(anticancer and photocatalytic activities).The formation of ZnO-NPs was confirmed by UV–visible ***(hexagonal)form of the herb-assisted synthesised ZnO-NPs with particle size ranging from 20 to 200 nm was confirmed by transmission electron microscopy(TEM)*** vitro analysis was carried out against Dalton's lymphoma ascites(DLA)cell lines by trypan blue assay,the results revealed 96%inhibition at concentration of 200μg ml-1,and the photodegradation experiments carried out for degradation of Congo red revealed complete degradation of the dye after 70 min of exposure to UV light.

关键词： Zinc oxide nanoparticles Anticancer activity Photocatalysis Congo red