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| 1 | Effect of induced magnetic field on natural convection in vertical concentric annuli显示文摘In the present paper,we have considered the steady fully developed laminar natural convective flow in open ended vertical concentric annuli in the presence of a radial magnetic field.The induced magnetic field produced by the motion of an electrically conducting fluid is taken into account.The transport equations concerned with the considered model are first recast in the non-dimensional form and then unified analytical solutions for the velocity,induced magnetic field and temperature field are obtained for the cases of isothermal and constant heat flux on the inner cylinder of concentric annuli.The effects of the various physical parameters appearing into the model are demonstrated through graphs and tables.It is found that the magnitude of maximum value of the fluid velocity as well as induced magnetic field is greater in the case of isothermal condition compared with the constant heat flux case when the gap between the cylinders is less or equal to 1.70 times the radius of inner cylinder,while reverse trend occurs when the gap between the cylinders is greater than 1.71 times the radius of inner cylinder.These fields are almost the same when the gap between the cylinders is equal to 1.71 times the radius of inner cylinder for both the cases.It is also found that as the Hartmann number increases,there is a flattening tendency for both the velocity and the induced magnetic field.The influence of the induced magnetic field is to increase the velocity profiles. | R.K.Singh A.K.Singh | 2012 | Acta Mechanica Sinica2012，28，2： | 2 |
| 2 | Agroforestry for soil and water conservation in the western Himalayan Valley Region of India显示文摘 | Pratap Narain R.K.Singh N.S.Sindhwal | | 0，，： | 1 |
| 3 | Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials显示文摘Microbially induced calcium carbonate(CaCO_(3))precipitation(MICP)has been investigated as a sustain-able alternative to conventional concrete remediation methods for improving the mechanical properties and durability of concrete structures.To date,urea-dependent MICP is the most widely employed MICP pathway in biological self-healing concrete research as its use has resulted in efficient CaCO_(3) precipita-tion rates.NH_(3) is a byproduct of ureolysis,and can be hazardous to cementitious structures and the health of various species.Accordingly,non-ureolytic bacterial concrete self-healing systems have been developed as eco-friendly alternatives to urea-dependent self-healing systems.Non-ureolytic pathways can improve the physical properties of concrete samples and incorporate the use of waste materials;they have the potential to be cost-effective and sustainable.Moreover,they can be applied in terrestrial and marine environments.To date,research on non-ureolytic concrete self-healing systems has been scarce compared to that on ureolytic systems.This article discusses the advances and challenges in non-ureolytic bacterial concrete self-healing studies and highlights the directions for future research. | Mohammad Fahimizadeh Pooria Pasbakhsh Lee Sui Mae Joash Ban Lee Tan R.K.Singh Raman | 2022 | Engineering2022，8，6： | 1 |
| 4 | Fuzzy AHP approach for legal judgement summarization显示文摘Legal documents are generally big and complex documents because of specific vocabulary,semantics and structure.One of the major challenges in legal processing systems is to generate summary of legal judgements.Till date,in most of the legal systems,the summary of judgements is produced manually by legal experts which are then used by Lawyers,Judges and other legal professionals.The manual process of summarization is very inefficient and time-consuming.Automatic text summarization(ATS)is the process of reducing the content of a textual document,while retaining the core description of text through the use of appropriate tool.The present work proposes a novel Fuzzy Analytical Hierarchical process(FAHP)based feature weighting scheme which helps in producing an efficient and effective summary of legal judgement.Model is applied on a number of legal judgements taken from Indian IT Act.Validation of the model is done using ROUGE(Recall-Oriented Understudy for Gisting Evaluation)tool with recall,precision,and f-measure as performance measures.The generated summaries are further assessed by legal experts and are found to be more promising than the summaries generated by traditional approaches. | Neha Bansal Arun Sharma R.K.Singh | 2019 | Journal of Management Analytics2019，6，3： | 1 |
| 5 | Impact of source and drain contact thickness on the performance of organic thin film transistors显示文摘This paper analyzes the impact of source(ts) and drain(td) contact thicknesses on top contact(TC) and bottom contact(BC) organic thin film transistors(OTFTs) with a gate in the bottom, using a benchmarked industry standard Atlas 2-D numerical device simulator. The parameters including drive current(Ids), mobility(μ), threshold voltage(Vt)and current on-off ratio(ION/IOFF) are analyzed from the device physics point of view on different electrode thicknesses, ranging from infinitesimal to 50 nm, for both top and bottom contact structures. Observations demonstrate that the performance of the BC structure is more affected by scaling of ts=din comparison to its counterpart. In the linear region, the mobility is almost constant at all the values of ts=dfor both structures. However,an increment of 18% and 83% in saturation region mobility is found for TC andBC structures, respectively with scaling down ts=dfrom 50–0 nm. Besides this, the current on-off ratio increases more sharply in the BC structure.This analysis simplifies a number of issues related to the design and fabrication of organic material based devices and circuits. | Poornima Mittal Y.S.Negi R.K.Singh | 2014 | Journal of Semiconductors2014，35，12： | 1 |
| 6 | Atomic Processes in Emission Characteristics of a Lithium Plasma Plume Formed by Double-Pulse Laser Ablation显示文摘High resolution spectral analysis of lithium plasma formed by single and double laser ablation has been undertaken to understand the plume-laser interaction,especially at the early stages of the plasma plume.In order to identify different atomic processes in evolving plasma,time resolved spectral emission studies at different inter-pulse delays have been performed for ionic and neutral lithium lines emitting from different levels.Along with the enhancement in emission intensity,a large line broadening and spectral shift,especially in the case of excited state transition Li I 610.3nm have been observed in the presence of the second pulse.This broadening and shift gradually decrease with increasing time delay.Another interesting feature is the appearance of a multi-component structure in the ionic line at 548.4nm and these components change conversely into a single structure at the later stages of the plasma.The multi-component structures are correlated with the presence of different velocity (temperature) distributions in non-LTE conditions.Atomic analyses by computing photon emissivity coefficients with an ADAS code have been used to identify the above processes. | V.SIVAKUMARAN AJAI KUMAR R.K.SINGH V.PRAHLAD H.C.JOSHI | 2013 | Plasma Science and Technology2013，15，3： | 0 |
| 7 | Graphene coatings for corrosion resistance of nickel and copper in acidic,alkaline and neutral environments显示文摘Graphene coatings have been reported to provide impressive corrosion resistance to nickel(Ni)and copper(Cu),because of remarkable characteristics of inertness and impermeablity of graphene.However,as the earlier investigations have generally been carried out in chloride environment,and it is important to understand the performance of graphene coating also in more aggressive environments such as acids and alkali.This study investigated the electrochemical corrosion behaviour of bare and graphene-coated(by chemical vapour deposition(CVD))Ni and Cu in 0.5 M H_(2)SO_(4),0.1 M NaCl and 0.5 M NaOH solutions.Electrochemical tests and post corrosion characterisation revealed the improvement in the corrosion resistance of Ni due to multilayer graphene coating to be similar in the three solutions,i.e.,the robustness of the barrier property of the multilayer graphene is largely unaffected by the aggressiveness of the corrosive environment.However,the improvement in corrosion resistance of bare Ni due to multilayer graphene is considerably greater(nearly 3 orders of magnitude)in the most aggressive of the test solutions(0.5 M H_(2)SO_(4)).The improvement is considerably less in 0.5 M NaOH because bare Ni develops a robust passive layer in highly alkaline solutions.The improvement in corrosion resistance of bare Cu is limited(within an order of magnitude)in the three solutions because Cu develops only 1-2 layers of graphene. | R.K.Singh Raman Abhishek Kumar Arya Kevin Tomy Faisal A Dip Evelyn Lai Saad Al-Saadi | 2023 | Journal of Materials Science & Technology2023，，11： | 0 |
| 8 | Augmented growth of long pepper in response to arbuscular mycorrhizal inoculation显示文摘Arbuscular mycorrhizal (AM) technology is a soil-based fertilization practice for sustainable crop productivity. We evaluated six indigenous Arbuscular mycorrhizal fungi (AMF) strains for their symbiotic response with Piper longum (long pepper), a non-timber forest product holding promise as a commercial crop for its medicinal fruits and roots. Piper saplings were raised in a 10 cm thick sand and soil mix inoculated with various AMF. Under field conditions, plants inoculated with AMF demonstrated better survival (≥80%) than non mycorrhizal plants (58%). Almost all the studied AMF strains increased the plant growth, biomass and nutrient content (N and P) over the uninoculated control. Mycorrhizal inoculation with four AMF species, viz: Glomus fasciculatum, G. clarum, G. etunicatum and G. versiforme greatly enhanced long pepper growth both in the nursery and field conditions. | R.K.Singh P.Gogoi | 2012 | Journal of Forestry Research2012，23，2： | 0 |
| 9 | Graphene-calcium carbonate coating to improve the degradation resistance and mechanical integrity of a biodegradable implant显示文摘Biodegradable implants are critical for regenerative orthopaedic procedures,but they may suffer from too fast corrosion in human-body environment.This necessitates the synthesis of a suitable coating that may improve the corrosion resistance of these implants without compromising their mechanical integrity.In this study,an AZ91 magnesium alloy,as a representative for a biodegradable Mg implant material,was modified with a thin reduced graphene oxide(RGO)-calcium carbonate(CaCO_(3))composite coating.Detailed analytical and in-vitro electrochemical characterization reveals that this coating significantly improves the corrosion resistance and mechanical integrity,and thus has the potential to greatly extend the related application field. | Lokesh Choudhary Parama Chakraborty Banerjee R.K.Singh Raman Derrek E.Lobo Christopher D.Easton Mainak Majumder Frank Witte Jörg F.Löffler | 2024 | Journal of Magnesium and Alloys2024，12，1： | 0 |
| 10 | Gate leakage current reduction in IP3 SRAM cells at 45 nm CMOS technology for multimedia applications显示文摘We have presented an analysis of the gate leakage current of the IP3 static random access memory (SRAM) cell structure when the cell is in idle mode(performs no data read/write operations) and active mode (performs data read/write operations),along with the requirements for the overall standby leakage power,active write and read powers.A comparison has been drawn with existing SRAM cell structures,the conventional 6T,PP, P4 and P3 cells.At the supply voltage,V_(DD) = 0.8 V,a reduction of 98%,99%,92%and 94%is observed in the gate leakage current in comparison with the 6T,PP,P4 and P3 SRAM cells,respectively,while at V_(DD) = 0.7 V,it is 97%,98%,87%and 84%.A significant reduction is also observed in the overall standby leakage power by 56%>, the active write power by 44%and the active read power by 99%,compared with the conventional 6T SRAM cell at V_(DD)= 0.8 V,with no loss in cell stability and performance with a small area penalty.The simulation environment used for this work is 45 nm deep sub-micron complementary metal oxide semiconductor(CMOS) technology,t_(ox) = 2.4 nm,K_(thn) = 0.22 V,K_(thp) = 0.224 V,V_(DD) = 0.7 V and 0.8 V,at T = 300 K. | R.K.Singh Neeraj Kr.Shukla Manisha Pattanaik | 2012 | Journal of Semiconductors2012，33，5： | 0 |
| 11 | Effect of Fertilizer Diammonium Phosphate on Liver,Kidney and Muscle 5-Nucleotidase Activity of Fresh Water Teleost Fish Clarias batrachus显示文摘The toxic effect of fertilizer Diammonium phosphate resulted in alterations of 5'-Nucleotidase activity of tissues-liver,kidney and muscles of fish C.batrachus at varying intervals and exposures.Alterations in 5'-Nucleotidase activity of body organs gave an idea of the toxicity caused by the fertilizer.Thus the enzyme 5'-Nucleotidase can be used to monitor the pollution in aquatic ecosystem. | T.S.NAQVI M.S.NAQVI R.K.SINGH | 1993 | Biomedical and Environmental Sciences1993，6，4： | 0 |
| 12 | MHD free convective flow past semi-infinite vertical permeable wall显示文摘In this paper,the basic equations governing the flow and heat transfer of an incompressible viscous and electrically conducting fluid past a semi-infinite vertical permeable plate in the form of partial differential equations are reduced to a set of non-linear ordinary differential equations by applying a suitable similarity transformation.Approximate solutions of the transformed equations are obtained by employing the perturbation method for two cases,i.e.,small and large values of the suction parameter.From the numerical evaluations of the solution,it can be seen that the velocity field at any point decreases as the values of the magnetic and suction parameters increase.The effect of the magnetic parameter is to increase the thermal boundary layer.It is also found that the velocity and temperature fields decrease with the increase in the sink parameter. | R.K.SINGH A.K.SINGH | 2012 | Applied Mathematics and Mechanics(English Edition)2012，33，9： | 0 |
| 13 | Teratogenicity Studies of a New Potent Tetanus Vaccine in Rabbit (Oryctolagus cuniculus)显示文摘Glaxo Laboratories, Bombay, have prepared a potent tetanus vaccine of 250 Lf as a substitute of the previous 5 Lf tetanus vaccine. The safety evaluation of the vaccine has been reported, but the teratogenic potential was not studied. In the experiment reported herein we have studied the teratogenic action of the vaccine in the progeny of rabbits. No congenital anomalies were observed. | N.SETHI R.K.SRIVASTAVA R.K.SINGH | 1991 | Biomedical and Environmental Sciences1991，4，3： | 0 |
| 14 | Safety Evaluation of a Potent Tetanus Vaccine (250 Lf) in Guinea Pigs (Cavia procellus)显示文摘A subacute toxicity study of a potent tetanus toxoid (250 Lf) was carried out in guinea pigs.The toxoid was injected subcutaneously at the nape of the neck at dose levels of 1.0, 1.5.and 2.0 ml in Groups Ⅱ. Ⅲ. and Ⅳ, respectively.In the controls (Group Ⅰ) 2.0 ml of aluminum phosphate suspension was given in each injection.Periodic evaluations of body weight, food/water intake, general observable behavior, hematology.and blood chemistry in toxoid-injected guinea pigs were similar to those in control guinea pigs.Thus, the toxoid did not cause any side effects up to four times the dose proposed for humans.1990 Academic Press, Inc. | N.SETHI R.K.SRIVASTAVA R.K.SINGH S.SRIVASTAVA | 1990 | Biomedical and Environmental Sciences1990，3，3： | 0 |
| 15 | Systematic study of the(n,2n)reaction cross section for^(121)Sb and^(123)Sb isotopes显示文摘The cross sections of the^(121)Sb(n,2n)^(120)Sb^(m) and ^(123)Sb(n,2n)^(122)Sb reactions were measured at 12.50,15.79 and 18.87 MeV neutron energies relative to the standard ^(27)Al(n,α)^(24)Na monitor reaction using neutron activation and offline γ-ray spectrometry.Irradiation of the samples was performed at the BARC-TIFR Pelletron Linac Facility,Mumbai,India.The quasi-monoenergetic neutrons were generated via the ^(7)Li(p,n)reaction.Statistical model calculations were performed by nuclear reaction codes TALYS(ver.1.9)and EMPIRE(ver.3.2.2)using various input parameters and nuclear level density models.The cross sections of the ground and the isomeric state as well as the isomeric cross section ratio were studied theoretically from reaction threshold to 26 MeV energies.The effect of pre-equilibrium emission is also discussed in detail using different theoretical models.The present measured cross sections were discussed and compared with the reported experimental data and evaluation data of the JEFF-3.3,ENDF/B-VIII.0,JENDL/AD-2017 and TENDL-2019 libraries.A detailed analysis of the uncertainties in the measured cross section data was performed using the covariance analysis method.Furthermore,a systematic study of the(n,2n)reaction cross section for^(121)Sb and^(123)Sb isotopes was also performed within 14-15 MeV neutron energies using various systematic formulae.This work helps to overcome discrepancies in Sb data and illustrate a better understanding of pre-equilibrium emission in the(n,2n)reaction channel. | R.K.Singh N.L.Singh R.D.Chauhan Mayur Mehta S.V.Suryanarayana Rajnikant Makwana B.K.Nayak H.Naik Tarak Nath Nag K.Katovsky | 2022 | Chinese Physics C2022，46，5： | 0 |
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