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Effects of caliber rolling on microstructure and room temperature tensile properties of Mge3Ale1Zn alloy

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Journal of Magnesium and Alloys 2013年第2期1卷 169-175页

作者： R.L.Doiphode S.V.S.Narayana Murty N.prabhu b.p.kashyap Department of Metallurgical Engineering and Materials Science Indian Institute of Technology BombayMumbai 400076India Special Materials Division Vikram Sarabhai Space CenterISROTrivandrum 695022India

Mge3Ale1Zn(AZ31)alloy was caliber rolled isothermally in the temperature range of 250e450C to develop fine grains of 3.6e12.5 *** stressestrain curves obtained from tensile tests at room temperature were found to vary with the temperature employed in caliber *** tensile strength of 290 Mpa and ductility of 13.5%were obtained upon caliber rolling at 300C as compared to 188 Mpa and 15.2%,respectively,in the mill-rolled *** variations in tensile properties are explained by the concomitant grain size,texture and twins obtained as a function of caliber rolling temperature.

关键词： AZ31 Mg-alloy Caliber rolling Twinning Grain size Tensile properties

Grain growth in calibre rolled Mg-3Al-1Zn alloy and its effect on hardness

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Journal of Magnesium and Alloys 2015年第4期3卷 322-329页

作者： R.L.Doiphode S.V.S.Narayana Murty N.prabhu b.p.kashyap Department of Metallurgical Engineering and Materials Science Indian Institute of Technology BombayMumbai 400076India Department of Mechanical Engineering Government PolytechnicKolhapur 416004India Special Materials Division Vikram Sarabhai Space CenterISROTrivandrum 695022India

Calibre rolling of Mg-3Al-1Zn alloy at 300℃ led to development of fine grain size of 3μ*** annealing,from 5 to 6000 minutes at 300-450℃,revealed faster grain growth initially up to 60 minutes,which became sluggish on prolonged *** time exponent for grain growth kinetics(n)suggests bi-linear behaviour with n=0.11 and 0.008 over these time *** activation energy,based on various n values,varied over wide ranges that made the understanding of the mechanisms for grain growth *** problem is explained by concurrent evolution of texture and grain boundary *** effect of grain growth on hardness at ambient temperature was found to follow the H-p type relationship.

关键词： Annealing AZ31 Mg-alloy Calibre rolling Twinning Grain growth

User perspective of Misplaced ppIUCD and Factors Resulting in ppIUCD Removal: Qualitative pilot Study

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Open Journal of Epidemiology 2024年第3期14卷 517-532页

作者： A. G. Radhika Rashmi Gupta pooja kashyap Ravleen bakshi Department of Obstetrics and Gynecology University College of Medical Sciences & Guru Teg Bahadur Hospital Dilshad Garden Delhi India GTb Hospital Delhi India Indian Council of Medical Research Delhi India

Objective: The aim of the current study was to assess the impact of operative interventions for misplaced device among women who opted for ppIIUCD and the evaluation of reasons for ppIUCD removal within the follow up period of two years. Design: A descriptive exploratory study was conducted over three months among fourteen ppIUCD acceptors at a tertiary care health facility in Delhi, India. Face-to-face & telephonic in-depth interviews were conducted with a selected sample of ppIUCD acceptors who had later opted for its removal. Results: participants (n = 14) aged 24 – 40 exhibited generally positive attitudes towards ppIUCDs indicating an indicate an understanding of the importance of ppIUCD in preventing unintended pregnancies. Menstrual disturbance and misplaced IUCD were major reasons for removal. despite their own experience necessitating the removal of IUCD, positive experience by other family members (mothers in law) in this study helped to keep the confidence on the contraceptive. Themes included (a) general experience of ppIUCD use (b) Health Facility accessed for removal of IUCD (c) Would she recommend it to others? (d) preferred contraceptive after removal of IUCD. Conclusion: Misplaced IUCD, missing thread, menstrual irregularities, and pain are all associated with ppIUCD and are important reasons for dissatisfaction. Appropriate, timely and supportive individualized care that address knowledge gaps, societal perceptions, and healthcare system challenges would certainly help in reducing dissatisfaction due to ppIUCD and thereby the removal rates.

关键词： postpartum Intrauterine Device ppIUCD LARC Long Acting Reversible Contraception postpartum Family planning Contraception

Measuring turbulence in a circulating fluidized bed using pIV techniques

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particuology 2011年第6期9卷 572-588页

作者： Mayank kashyap benjapon Chalermsinsuwan Dimitri Gidaspow Department of Chemical and biological Engineering Illinois Institute of Technology Fuel Research Center Department of Chemical Technology Faculty of Science Chulalongkorn University Center of Excellence for petroleum Petrochemicals and Advanced Materials Chulalongkorn University

This study utilized the particle image velocimetry （p1V） technique, non-invasively near the wall, in the developing region, for the measurements of laminar and turbulent properties during circulation of Geldart b type particles in the U.S. Department of Energy （DOE） National Energy Technology Laboratory （NETL） riser. A novel method was used to measure axial and radial laminar and turbulent solids dispersion coefficients using autocorrelation technique. The instantaneous and hydrodynamic velocities for the solid phase were measured simultaneously in the axial and radial directions using a CCD camera, with the help of a colored rotating transparency. The measured properties, such as laminar and Reynolds stresses, laminar and turbulent granular tempera- tures, laminar and turbulent dispersion coefficients and energy spectra exhibited anisotropy. The mixing in the riser was on the level of clusters. The total granular temperatures were in reasonable agreement with the literature values. However, the axial and radial solids dispersion coefficients measured near the wall were slightly lower than the radially averaged values in the literature.

关键词： particle image velocimetry (pIV) Dispersion coefficient Autocorrelation Turbulence Anisotrnpy

Induction of apoptosis in leukemic cells by the alkaloid extract of garden cress(Lepidium sativum L.)

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Journal of Integrative Medicine 2019年第3期17卷 221-228页

作者： Shriniwas S.basaiyye Sanjay kashyap Kannan Krishnamurthi Saravanadevi Sivanesan Environmental Health Division CSIR-National Environmental Engineering Research Institute Analytical Instrument Division CSIR-National Environmental Engineering Research Institute

Objective: Garden cress(Lepidium sativum L.) is an important herb in traditional medicine used to improve production of breast milk in women and semen in men. In the present research the authors evaluated its ability to destroy leukemic cancer(Jurkat E6-1) cells, using the alkaloid extract of this ***: Constituents of the alkaloid extract were analyzed by gas chromatography–mass spectrometry(GC–MS) and their cytotoxicity in leukemic cancer cells and healthy peripheral blood mononuclear cells(pbMCs) was assessed. Cell death via apoptosis was confirmed by DNA laddering, caspase-3 activity,annexin V-fluorescein isothiocyanate and mitochondrial toxicity assays. The specific course of gene activation in treated cells was determined through quantitative polymerase chain reaction(qpCR).Results: GC–MS analysis identified six alkaloids and proto-alkaloids, namely, benzyl isothiocyanate(1),2-ethoxy-4 H-3,1-benzoxazin-4-one(2),(4 R)-2-(2-aminophenyl)-4-phenyloxazoline(3), 5-acetyl-1,2-di hydro-6-methyl-2-oxo-4-phenyl-3-pyridinecarbonitrile(4), benzo[b][1,8]-naphthyridin-5(10 H)-on e,2,4,7-trimethyl(5) and 1,4-diaminoanthraquinone(6), in the alkaloid extract of L. sativum. Of these,compound 1 was previously identified in the seeds of L. sativum. Exposure to the alkaloid extract caused death of Jurkat E6-1 cells, with median lethal concentration(LC50) of 75.25 mg/mL. However, the alkaloid extract also showed a nontoxic and proliferative(1.6-fold) effect in healthy pbMCs. Further experiments performed with Jurkat cells at LC50 and sub-LC50 doses demonstrated DNA fragmentation, activation of caspase-3 and time-dependant phosphatidylserine translocation(apoptosis) from inner to outer cell membranes. Cell toxicity and assessment of adenosine triphosphate level, together with using qpCR to evaluate expression profile of major apoptosis genes, revealed that apoptosis may be induced by disruption in the mitochondrial outer membrane potential, through activation of extrinsic a

关键词： Lepidium sativum benzyl isothiocyanate Apoptosis peripheral blood mononuclear cell Mitochondrial toxicity

Improved thermoelectric property of cation-substituted CaMnO_3

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Chinese physics b 2015年第9期24卷 542-547页

作者： pradeep Kumar Subhash C.kashyap Vijay Kumar Sharma H.C.Gupta Department of physics Shyam Lal CollegeUniversity of Delhi Department of physics Indian Institute of Technology Delhi

Single-phase pristine and cation-substituted calcium manganite（Ca1-xbixMn1-yVyO3-δ） polycrystalline samples were synthesized by the solid state reaction technique. Their thermoelectric properties were measured by a set up that was designed and assembled in the laboratory. The Ca1-x bixMn1-yVyO3-δsample with x = y = 0.04 has shown a power factor（S^2σ） of 176 μW/m/K^2 at 423 K, which is nearly two orders of magnitude higher than that of the pristine sample（2.1 μW/m/K2）. The power factor of the substituted oxide remains almost temperature independent as the Seebeck coefficient increases monotonically with temperature, along with the simultaneous decrease in electrical resistivity which is attributed to enhanced electron density due to co-doping of bismuth and vanadium and grain boundary scattering. These cation-substituted calcium manganites can be used as a potential candidate for an n-type leg in a thermoelectric generator（module）.

关键词： thermoelectric materials solid state reaction Seebeck coefficient power factor

Cytochrome p450 bM3 of bacillus megaterium-A possible endosulfan biotransforming gene

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Journal of Environmental Sciences 2014年第11期26卷 2307-2314页

作者： Muhil Vannan Seralathan Saravanadevi Sivanesan Amit bafana Sanjay Madanchand kashyap Arrigo patrizio Kannan Krishnamurthi Tapan Chakrabarti Environmental Health Division CSIR-NEERI Nagpur 440020 India Analytical Instrumentation Division CSIR-NEERI Nagpur 440020 India CNR-ISMAC via De Marini 616149 Genova Italy

Computing chemistry was applied to understand biotransforrnation mechanism of an organochlorine pesticide, endosulfan. The stereo specific metabolic activity of human CYp-2b6 （cytochrome p450） on endosulfan has been well demonstrated. Sequence and structural similarity search revealed that the bacterium bacillus megaterium encodes CYp-bM3, which is similar to CYp-2b6. The functional similarity was studied at organism level by batch-scale studies and it was proved that b. megaterium could metabolize endosulfan to endosulfan sulfate, as CYp-2b6 does in human system. The gene expression analyses also confirmed the possible role of CYp-bM3 in endosulfan metabolism. Thus, our results show that the protein structure based in-silico approach can help us to understand and identify microbes for remediation strategy development. To the best of our knowledge this is the first report which has extrapolated the bacterial gene for endosulfan biotransformation through in silico prediction approach for metabolic gene identification.

关键词： protein structure similarity CYp-2b6 CYp-bM3 Endosulfan

Intraocular fine needle aspiration cytology as a diagnostic modality for retinoblastoma

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International Journal of Ophthalmology(English edition) 2016年第8期9卷 1233-1235页

作者： bhavna Chawla Anand Tomar Seema Sen Mandeep S.bajaj Seema kashyap Ocular Oncology & paediatric Ophthalmology Service Dr.Rajendra Prasad Centre for Ophthalmic Sciences All India Institute of Medical Sciences Ocular pathology Service Dr. Rajendra Prasad Centre for Ophthalmic Sciences All India Institute of Medical Sciences

INTRODUCTION The diagnosis of retinoblastoma(Rb)is usually made by clinical examination and imaging modalities such as b-scan ultrasonography of the eye,CT scan and MRI of the *** role of fine needle aspiration cytology(FNAC)as a diagnostic modality for Rb has been controversial,mainly due to concerns of tumor dissemination and extra-ocular spread[1-2].Although the majority of Rb cases can be diagnosed without the need for any invasive procedure,in

关键词： FNAC Rb

Congenital diarrhea in a newborn infant: A case report

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World Journal of Clinical pediatrics 2019年第3期8卷 43-48页

作者： Mehrin Sadiq Omer Choudry Arun K kashyap Danitza M Velazquez Robert Wood Johnson University Hospital Rutgers University

bACKGROUND Microvillus inclusion disease(MVID)is a rare autosomal recessive cause of severe congenital diarrhea with significant morbidity and *** treatment involves bowel *** diagnosis of this condition can be challenging and a few genetic panels are available for the identification of the most common *** present the case of an infant with MVID due to a mutation not reported in the literature *** SUMMARY We report the case of an infant transferred to our institution with severe diarrhea of unknown etiology,failure to thrive,and significant metabolic *** extensive work-up including stool studies for common gastrointestinal pathogens,abdominal ultrasound,esophagogastroduodenoscopy with duodenal biopsy and flexible sigmoidoscopy failed to reveal a *** dietary and formula regimens were introduced but all resulted in voluminous *** remained on total parenteral nutrition(TpN)for the duration of her hospital *** testing was done and she was subsequently found to have a novel mutation in the MYO5b gene[homozygous mutation for MYO5b c.1462del,p.(Ile488Leufs*93)]giving us the diagnosis of *** remains on TpN while awaiting bowel transplant at the time of the compilation of this case *** We report a novel mutation involved in MVID and highlight the importance of considering this disease when faced with a newborn presenting with life threatening *** the time of this publication,232 allelic variations of this gene(MIM#606540)exist in National Center for biotechnology Information’s *** patient’s mutation has not been reported in literature as a cause of MVID.

关键词： Case report Congenital diarrhea Microvillus inclusion disease Failure tothrive