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Journal of Magnesium and Alloys 2024年第1期12卷 394-404页

作者： Lokesh Choudhary Parama Chakraborty Banerjee r.K.singh raman Derrek E.Lobo Christopher D.Easton Mainak Majumder Frank Witte Jörg F.Löffler Department of Mechanical and Aerospace Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Department of Chemical and Biological Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Nanoscale Science and Engineering Laboratory(NSEL) Bldg 37Monash UniversityClayton CampusMelbourneVIC 3800Australia CSIrO Materials Science and Engineering Bayview AvenueClaytonVIC 3168Australia Julius Wolff Institute and Berlin Brandenburg Center for regenerative Therapies Charité–Universitätsmedizin BerlinAugustenburger Platz 113353 BerlinGermany Laboratory of Metal Physics and Technology Department of MaterialsETH Zurich8093 ZurichSwitzerland

Biodegradable implants are critical for regenerative orthopaedic procedures,but they may suffer from too fast corrosion in human-body *** necessitates the synthesis of a suitable coating that may improve the corrosion resistance of these implants without compromising their mechanical *** 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 *** 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.

关键词： Graphene coating Biodegradable implant Hydroxyapatite Corrosion Magnesium alloy

Excipient effect on antimicrobial activity of Cinnamon (Cinnamomum zelylanicum album) oil, Thyme (Thymus vulgaris) oil and Ajowan (Trachyspermum ammi) oil

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Infectious Diseases research 2024年第1期5卷 27-31页

作者： Bhoj r singh Shiv Varan singh ravikant Agarwal Akanksha Yadav Division of Epidemiology ICAR-Indian Veterinary Research InstituteBareilly 243122India Division of Bacteriology and Mycology ICAR-Indian Veterinary Research InstituteBareilly 243122India Division of Livestock Products Technology ICAR-Indian Veterinary Research InstituteBareilly 243122India.

Background:Many herbal essential oils are potential antimicrobials but their pharmaceutical utility is restricted due to a lack of suitable excipients to mollify their dermatotoxicity and irritant property,and outcome of their therapeutic use may vary with different diluents ***:Effect of 16 diluents(dimethyl sulfoxide,liquid paraffin,glycerine,oils of mustard,sunflower,rice bran,palm,groundnut,olive,coconut,sesame,avocado,jojoba,castor,linseed and soybean)was assessed on antimicrobial activity of 2%cinnamon(Cinnamomum zelylanicum album),thyme(Thymus vulgaris)and ajowan(Trachyspermum ammi)oils using agar well diffusion *** effect of excipients was evaluated on six Candida albicans,five Escherichia coli,four Acinetobacter lwoffii,two strains each of Staphylococcus aureus,Enterobacter agglomerans,and Enterococcus faecium and one strain each of Acinetobacter calcoaceticus,Escherichia fergusonii,Klebsiella oxytoca,*** ***,Leclercia adecarboxylata,Paenibacillus amylolyticus,Proteus mirabilis,***,Pseudomonas aeruginosa,raoultella terrigena,Staphylococcus capitis ***,***,***,*** and Streptococcus ***:Thyme oil(2%)maintained it antimicrobial activity on dilution in dimethyl sulfoxide and glycerine,and ajowan oil(2%)completely lost its antibacterial activity in all diluents except dimethyl ***,cinnamon oil partially lost its antimicrobial activity upon dilution in glycerine,vegetable,and mineral oils in comparison to dimethyl *** oil was the best vegetable oil,almost comparable to dimethyl sulfoxide and castor oil was the worst diluent for maintaining antimicrobial activity of cinnamon ***:The study indicated the non-suitability of vegetable oils for pharmaceutical formulations of essential oils except olive oil for dilution of cinnamon oil and glycerol for thyme oil to replace dimethyl sulfoxide as diluent.

关键词： essential oils herbal antimicrobials herbal drug-resistance Bacteria Candida

Comparative antimicrobial activity in Murrah buffalo (Bubalus bubalis) Heifers’ urine and urine distillate

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Infectious Diseases research 2024年第1期5卷 32-39页

作者： Bhoj r singh Himani Agri Dayanath Balusamy Akanksha Yadav Varsha Jayakumar Division of Epidemiology ICAR-Indian Veterinary Research InstituteBareilly 243122India.

Background:Murrah buffalo is a breed of water buffalo(Bubalus bubalis)reared for milk and meat,especially in Northern *** are so many studies on the antimicrobial potential of the cow(Bos indicus)urine but buffalo urine has rarely been *** study was aimed to evaluate the antimicrobial activity in whole buffalo urine and its ***:Urine specimens were collected from seven Murrah buffalo heifers in the morning over three days from all seven heifers and distillated to prepare urine distillate(UD).The antimicrobial activity was determined through 96 well microplate method diluting(1:1)urine and UD in Mueller Hinton liquid medium against 919 microbial strains belonging to 148 species of 49 genera(Candia,11 genera of Gram+ve bacteria,37 genera of Gram-ve bacteria).The test strains were taken from the repository,revived and tested for purity before *** test strains were of clinical origin(372),environmental origin(496)and also from reference strain repositories(51).results:Of the 919 test strains,a total of 57.89%and 56.04%of the tested strains were susceptible to UD and urine,*** was a no significant(p>0.4)difference in the antimicrobial activity of UD and urine against 919 strains of microbes,regardless of their genus,species,and Gram staining ***,there was no significant(p>0.4)difference between the susceptibility of bacterial and Candida strains to UD or ***,strains of clinical origin were more often resistant to buffalo UD and urine(prains isolated from environmental sources irrespective of their Gram staining characteristics(p>0.05).A significantly(pr proportion of reference strains was susceptible to UD and urine than microbial strains of clinical and environmental *** buffalo urine and UD,the most susceptible strains were Stenotrophomonas maltophilia(13/13)followed by Citrobacter freundii(8/10);Salmonella enterica ***(21/27),Geobacillus stearothermo

关键词： Bubalus bubalis Edwardsiella tarda Entereococcus faecium Escherichia coli Klebsiella pneumoniae raoultella terrigena Salmonella enteric

MHD free convective flow past semi-infinite vertical permeable wall

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Applied Mathematics and Mechanics(English Edition) 2012年第9期33卷 1207-1222页

作者： r.K.singh A.K.singh Department of Mathematics Banaras Hindu University

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 per- meable 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. Approx- imate 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 thermM boundary layer. It is also found that the velocity and temperature fields decrease with the increase in the sink parameter.

关键词： magnetohydrodynamics (MHD) suction source/sink Prandtl number permeability boundary layer

Effect of induced magnetic field on natural convection in vertical concentric annuli

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Acta Mechanica Sinica 2012年第2期28卷 315-323页

作者： r.K.singh A.K.singh Department of Mathematics Central University of BiharPatnaIndia Department of Mathematics Banaras Hindu UniversityVaranasiIndia

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 ra- dial 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 con- sidered 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 cylin- der of concentric annuli. The effects of the various phys- ical 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 be- tween 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 ten- dency for both the velocity and the induced magnetic field. The influence of the induced magnetic field is to increase the velocity profiles.

关键词： Natural convection Isothermal Heat flux Skin-friction Induced magnetic field Magnetohydrody- namics

The effect of carbapenem resistance in Klebsiellae on infection outcomes in animals and birds

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Infectious Diseases research 2024年第2期5卷 12-14页

作者： Bhoj r singh Abhijit M Pawde Division of Epidemiology ICAR-Indian Veterinary Research InstituteBareilly 243122India Wildlife Cetre ICAR-Indian Veterinary Research InstituteBareilly 243122India

It is often said that the emergence of antimicrobial drug resistance(AMr)in pathogens is the major cause of *** the present study,clinical microbiology data on infections caused by Klebsiella pneumoniae strains and their antimicrobial drug resistance specifically to carbapenems retrieved from Clinical Epidemiology database of the Institute were analysed to determine the impact of carbapenem resistance in Klebsiellae isolated from the clinical samples of veterinary cases and outcome of the infection because in a few recent reports it is claimed that the presence of carbapenem-resistant Klebsiellae is associated with higher mortality in humans due to Klebsiella *** retrospective analysis of Klebsiella infections in animals and birds revealed that 21.8%of *** causing pneumonic or septicemic infections were carbapenem-resistant but the carbapenem resistance was not associated with increased numbers of deaths or *** may be probably due to the fact that carbapenem drugs were not used for the treatment of infected animals and carbapenem resistance may not be associated with the lethality potential of Klebsiellae.

关键词： Klebsiella pneumoniae Klebsiella oxytoca Klebsiella aerogenes abortions

remote sensing and GIS for land use/cover mapping and integrated land management： case from the middle Ganga plain

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Frontiers of Earth Science 2012年第2期6卷 167-176页

作者： r B singh Dilip KUMAr Department of Geography Delhi School of EconomicsUniversity of DelhiDelhi 110007India

In India, land resources have reached a critical stage due to the rapidly growing population. This challenge requires an integrated approach toward harnes- sing land resources, while taking into account the vulnerable environmental conditions. remote sensing and Geographical Information System （GIS） based technologies may be applied to an area in order to generate a sustainable development plan that is optimally suited to the terrain and to the productive potential of the local resources. The present study area is a part of the middle Ganga plain, known as Son-Karamnasa interfluve, in India. Alternative land use systems and the integration of livestock enterprises with the agricultural system have been suggested for land resources management. The objective of this paper is to prepare a land resource development plan in order to increase the productivity of land for sustainable development. The present study will contribute necessary input for policy makers to improve the socio-eeonomic and environmental conditions of the region.

关键词： land use/cover remote sensing GIS middleGanga plain integrated land management

Catalytic performances of kaoline and silica alumina in the thermal degradation of polypropylene

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燃料化学学报 2011年第3期39卷 198-202页

作者： Achyut K Panda r K singh National Institute of Technology rourkela Orissa Centurion Institute of Technology Bhubaneswar Orissa

Polypropylene was cracked thermally and catalytically in the presence of kaoline and silica alumina in a semi batch reactor in the temperature range 400℃～550℃ in order to obtain suitable liquid *** dependencies between process temperatures,types of catalyst,feed compositions and product yields of the obtained fuel fractions were *** was observed that up to 450℃ thermal cracking temperature,the major product of pyrolysis was liquid oil and the major product at other higher temperatures(475℃～550℃) are viscous liquid or wax and the highest yield of pyrolysis product is 82.85% by weight at 500℃.Use of kaoline and silica alumina decreased the reaction time and increased the yield of liquid *** the major pyrolysis product in catalytic pyrolysis at all temperatures was low viscous liquid *** alumina was found better as compared to kaoline in liquid yield and in reducing the reaction *** maximum oil yield using silica alumina and kaoline catalyst are 91% and 89.5% *** the basis of the obtained results hypothetical continuous process of waste polypropylene plastics processing for engine fuel production can be presented.

关键词： polypropylene pyrolysis silica alumina kaoline engine fuel

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

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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

Thermomechanical Control Process and Its Effect on Structure and Properties of High Strength Low Alloy Steels

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Journal of Iron and Steel research International 2011年第S1期18卷 511-520页

作者： singh r K P Director Kalyani Centre for Technology & innovationSurvey No.15Ahead of Renuka Mata MandirKeshavnagarPuneIndia - 411036

Low carbon steels microalloyed with small amount of carbide and/or nitride forming elements such as Nb,Ti and V with Thermomechanical controlled processing (TMCP) can give fine grained ferrite structure with high strength and superior *** present study was aimed at identifying rolling parameters as well as microstructural characterization for accomplishing high yield strength and high charpy impact property at-60℃ by controlling hot rolling parameters and microstructure Grain size distribution was also monitored and related to mechanical properties of steel.

关键词： HSLA steel thermomechanical control processing grain refining precipitation recrystalization