检索结果-南通市图书馆

Fluid Dynamics & Materials Processing 2023年第2期19卷 501-511页

作者： Shrikant Arunrao Thote Netra pal singh Department of Mechanical Engineering Oriental UniversityIndore453555India

The thermal behavior of pipes with a twisted tape inside(used to enhance heat transfer through the tube wall)is studied in the laminar flow *** is used as the work fluid with the corresponding Reynolds Number spanning the interval 200–*** is found that in such conditions the‘Nusselt Number’(Nu)gradually increases with reducing the tape twist ratio,whereas the friction factor is detrimentally affected by the presence of the tape(as witnessed by the comparison with the companion case where a plain tube is considered).In particular,it is shown that the heat transfer efficiency can be improved by nearly 69%if tape inserts with a relatively low twist ratio are *** the basis of these findings,it is concluded that loose fit tape inserts are superior to tight fit tapes in terms of heat transfer and ease of replacement.

关键词： Friction factor laminar flow Nusselt Number trapezoidal-cut twisted tape

Analysis of Friction and Heat Transfer Characteristics of Tubes with Trapezoidal Cut Twisted Tape Inserts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2023年第3期19卷 711-722页

作者： Shrikant Arunrao Thote Netra pal singh Department of Mechanical Engineering Oriental UniversityIndore453555India

The thermo-hydraulic properties of circular tubes with a twisted tape inside(used accordingly to induce turbulence and enhance heat transfer through the tube wall)are described for Reynolds Numbers ranging from 830 to *** twisted with the three distinct twist ratios are considered,namely,6,4.4 and *** is used as the working fluid in several *** the sake of comparison,the standard tube with no insert is also *** is shown that in the presence of the twisted tape,the‘frictional factor’,‘Nusselt Number’and the‘thermal performance factor’are much higher than those obtained for the plain ***,the tapes having the lowest twist ratio,i.e.,3,are more effective than the others in terms of heat transfer ***‘thermal performance factor’is greater than one for all the twisted tapes used in the experiments,which confirms the enhanced performances of the heat exchanger and the related savings in terms of total energy.

关键词： Friction factor nusselt number performance ratio trapezoidal cut twisted tape insert

An Easy Access to Oxime Ethers by Pd-Catalyzed C—O Cross-Coupling of Activated Aryl Bromides with Ketoximes and Chalcone Oximes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2020年第8期38卷 830-836页

作者： Reeta T.M.Rangarajan Raj pal singh R.P.singh Manjula singh Centre for Fire Explosive and Environment SafetyDRDODelhiIndia Department of Chemistry University of DelhiDelhiIndia Department of Chemistry Sri Venkateswara CollegeUniversity of DelhiNew DelhiIndia Department of Chemistry Shivaji CollegeUniversity of DelhiNew DelhiIndia

An efficient Pd-catalyzed method for C—O cross-coupling of ketoximes and chalcone oximes with activated aryl bromides and bromo-chalcones has been *** oxime ethers were obtained in good to excellent yields by[(π-allyl)PdCl]2/tBuXPhos(L7)catalyst ***(L11)was also found to be effective for the oxime *** method offers an easy and smooth coupling of chalcone oximes with activated aryl bromides and bromo-chalcones,which has not been previously explored.

关键词： coupling coupling bromide

Endosperm ontogeny through the lens of epigenetics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2023年第2期16卷 295-297页

作者： Kajol B.M.singh jitendra K.Thakur National Institute of Plant Genome Research New Delhi 110067India International Centre for Genetic Engineering and Biotechnology New Delhi 110067India

Endosperm tissue is crucial to seed *** and dicots have evolved different fates for their endosperm:it is usually consumed in dicots during seed development,while monocot seeds retain the endosperm until ***,Wu et al.(2022)addressed the role of divergent epigenetic regulation over the functionally conserved IKU2 gene contributing to silenced or persistent endosperm proliferation and have provided insights into divergent seed ontogeny patterns in ***,we highlight the novel findings from this study and their potential significance.

关键词： maturity finding insight

Thickness Dependent Physical Properties of Thermally Evaporated Nanocrystalline CdSe Thin Films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1299-1304页

作者： Anuradha Purohit Subhash Chander Satya pal Nehra Mahendra singh Dhaka Department of Physics Mohanlal Sukhadia University Centre of Excellence for Energy and Environmental Studies Deenbandhu Chhotu Ram University of Science and Technology Microelectronics Research Center Iowa State University of Science and Technology

This paper presents a study on thickness dependent physical properties of cadmium selenide thin films. The films of thickness 445, 631 and 810 nm were deposited employing thermal evaporation technique on glass and ITO-coated glass substrates followed by thermal annealing in air atmosphere at 200 °C. These films were subjected to X-ray diffractometer, UV-Vis spectrophotometer, scanning electron microscopy（SEM） and electrometer for structural, optical,surface morphological and electrical analysis respectively. The structural analysis reveals that the films are nanocrystalline in nature with cubic phase and preferred orientation（111）. The crystallographic parameters such as lattice constant, interplanar spacing, grain size, internal strain, dislocation density, number of crystallites per unit area and texture coefficient are calculated and discussed. The optical band gap is found in the range 1.75-1.92 e V and observed to increase with *** SEM study shows that the annealed films are uniform, fully covered and well defined. The electrical analysis shows that the conductivity is varied with film thickness and found within the order of semiconductor behavior.

关键词： Thin films X-ray diffraction Optical properties Electrical properties Evaporation

Nanostructured porous polyaniline(PANI)coated carbon cloth(CC)as electrodes for flexible supercapacitor device

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第29期88卷 168-182页

作者： Dinesh J.Ahirrao Ajay Kumar pal Vikalp singh Neetu Jha Department of Physics Institute of Chemical TechnologyMatunga(E)Mumbai400019India Department of Physics Ramniranjan Jhunjhunwala CollegeGhatkopar(W)Mumbai 400086India

Nanostructured porous polyaniline(PANI)has been synthesized and coated simultaneously on a highly flexible and conductive carbon cloth(CC)substrate using a simple in-situ chemical oxidative polymerization *** coated CC(PANI-CC)based flexible electrodes were further used for the fabrication of flexible supercapacitor *** the comparison purpose,pure PANI has also been synthesized and tested for its electrochemical *** energy storage capacity of PANI and PANI–CC composite was investigated using electrochemical techniques like CV,GCD,and EIS in a potential range from 0 to 0.8 V in 1 M H_(2)SO_(4)***-CC flexible electrodes exhibited the highest specific capacitance of 691 F/g;whereas,pure PANI could only achieve 575 F/g of specific capacitance at 1 A/*** also exhibited outstanding cyclic stability by recollecting 94%of its initial capacitance after 2000 GCD *** actual implementation,a flexible supercapacitor device has been fabricated using stainless steel sheets and PANI-CC flexile *** energy storage performance of the PANI-CC flexible supercapacitor device was tested at several bending angles,which resulted in 72%of capacitance retention at a maximum bending angle of 140°compared to the capacitance obtained at an angle 0°(flat state).PANI-CC exhibited improved electrochemical performance than pure PANI due to the synergistic effect between PANI and ***,CC helped in enhancing the conductivity and stability;whereas,PANI boosted the capacitance owing to its excellent porosity and fast pseudocapacitive charge storage response.

关键词： Polyaniline Carbon cloth Flexible supercapacitor Flexible electrode Composite

Traumatic bilateral hip dislocation with bilateral sciatic nerve palsy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Traumatology 2010年第2期13卷 126-128页

作者： Ajay pal singh Amarjit singh Sidhu Arun pal singh Department of Orthopaedics Guru Teg Bahadur Hospital University College of Medical Sciences University of Delhi Delhi 110095 India Department of Orthopaedics Rajindra Hospital Government Medical College Punjab 147001 India

Bilateral hip dislocation rarely occurs. In this paper, a case of bilateral hip dislocation associated with bilateral sciatic nerve palsy resulted from a road traffic accident is reported. Both hips were emergently reduced under general anaesthesia. Acetabular reconstruction was done bilaterally due to the unstable hips. The patient subsequently developed heterotopic ossification and avascular necrosis on the left hip and underwent total hip arthroplasty. The sciatic nerve on the right side achieved complete recovery but that on the left side only partly recovered and was augmented by tendon transfer. Such injuries are serious and one should be aware of the complications because they can resurface and so patients should be followed up for a long time. To the best of our knowledge, this kind of injury has not been reported in the English .language literature.

关键词： Hip dislocation Sciatic nerve Paralysis Accident, traffic

Vertical Sediment Concentration Distribution in High-Concentrated Flows:An Analytical Solution Using Homotopy Analysis Method

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第9期69卷 367-378页

作者： Manotosh Kumbhakar Jitraj Saha Koeli Ghoshal jitendra Kumar Vijay P.singh Department of Mathematics Indian Institute of Technology KharagpurKharagpur 721302India Department of Mathematics National Institute of TechnologyTiruchirappalliTamil Nadu 620015India Department of Biological and Agricultural Engineering&Zachry Department of Civil Engineering Texas A~M UniversityCollege StationTX 77843USA

Transport of suspended sediment in open channel flow has an enormous impact on real life situations,*** and management of reservoir sedimentation,geomorphic evolution such as dunes,rivers,and coastlines *** entails advection and *** diffusion is governed by the concept of Fick’s law,which is based on the molecular diffusion theory,and the equation that represents the distribution of sediment concentration is the advection-diffusion *** study uses the existing governing equation which considers different phases for solid and fluid,and then couples the two *** deal with high-concentrated flow,sediment and turbulent diffusion coefficients are taken to be different from each *** effect of hindered settling on sediment particles is incorporated in the governing equation,which makes the equation highly *** study derives an explicit closed-form analytical solution to the generalized one-dimensional diffusion equation representing the vertical sediment concentration distribution with an arbitrary turbulent diffusion coefficient *** solution is obtained by Homotopy Analysis Method,which does not rely on the small parameters present in the ***,the solution is validated by comparing it with the implicit solution and the numerical solution.A relevant set of laboratory data is selected to check the applicability of the model,and a close agreement shows the potential of the model in the context of application to high-concentrated sediment-laden open channel flow.

关键词： open channel flow diffusion equation hunt equation homotopy analysis method

Analysis of thermal injuries using classical Fourier and DPL models for multi-layer of skin under different boundary conditions

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2021年第6期14卷 85-114页

作者： Rajneesh Kumar Chaudhary Dinesh Kumar Kabindra Nath Rai jitendra singh Department of Mathematics Institute of Science Banaras Hindu UniversityVaranasi-221005India Department of Mathematics Govt.Polytechnic College Nawada-805122BiharIndia Department of Mathematical Sciences IIT-BHU Varanasi-221005India

In this paper,the temperature distribution in the multi-layer of the skin is studied when the skin surface is subjected to most generalized boundary *** skin model consists of three layers known as the epidermis,dermis,and subcutaneous *** layers of skin are assumed to be connected with point of interface condition and taking the barrier in between each of the two layers by symmetric flux condition and analyzing each layer *** classical Fourier and non-Fourier(DPL)models are extended to analyze the behavior of heat transfer in the multi-layer of the *** Laplace transform technique is used to derive analytical solutions for the multi-layer of skin *** effects of the variability of different parameters such as relaxation time,layer thickness,and different types of boundary conditions on the behavior of temperature distribution in the multi-layer of skin are analyzed and discussed in *** the effects are shown *** has been observed that during temperature distribution in the multi-layer of skin,the measurement of skin damage is less on the DPL model(rq>Tt)in comparison to the classical Fourier model.

关键词： Skin of multi-layer generalized boundary condition dual-phase lagging burn effect relaxation time Laplace transform technique

Comparative drug susceptibility study of five clonal strains of Trichomonas vaginalis in vitro

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第1期4卷 50-53页

作者： Hemantkumar Somabhai Chaudhari Prati pal singh Department of Pharmacology and Toxicology National Institute of Pharmaceutical Education and Research(NIPER)Sector-67Phase-XS.A.S.Nagar-160062PunjabIndia

Objective:To produce comparative data on a group of Trichomonas vaginalis clonal strains with varied drug responses using identical methods and ***:Five clonal strains of Trichomonas vaginalis were isolated from reference strain using agar plate *** variability of growth kinetic and susceptibility of clonal strain to metronidazole,tinidazole, satranidazole and nitazoxanide were observed in 96 well microlilre ***:Among these clonal strains there was a good correlation between rates of growth with the relative susceptibility of the strains to drugs in *** metronidazole,tinidazole and satranidazole susceptibility,different degrees of susceptibility were ***,no difference in nitazoxanide susceptibility was found between the clonal strain tested and a reference strain. Conclusions:This is the first description of biological variability in clonal stock of Trichomonas *** degrees of drug susceptibility were determined among clonal strains tested. Further studies will be necessary to ascertain the importance of this variability in clinical infection.

关键词： Trichomonas vaginalis Clonal strains Drug susceptibility Metronidazole