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Robertson-Walker cosmological models with perfect fluid in general relativity

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Research in Astronomy and Astrophysics 2011年第7期11卷 767-775页

作者： rishi Kumar Tiwari Department of Mathematics Govt.Model Science College Rewa(M.P.) 486001India

Einstein＇s field equations with variable gravitational and cosmological constants are considered in the presence of perfect fluid for a Robertson-Walker universe by assuming the cosmological term to be proportional to R-m（R is a scale factor and m is a constant）.A variety of solutions is *** physical significance of the cosmological models has also been discussed.

关键词： cosmological parameters—cosmology:variable cosmological term

A selective literature review exploring the role of the nicotinic system in schizophrenia

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General Psychiatry 2023年第2期36卷 86-91页

作者： Guna Kanniah rishi Kumar Mental Health and Addictions Services Waikato DHBWaikato HospitalHamiltonNew Zealand Department of General Medicine Middlemore HospitalAucklandNew Zealand

Nicotine use is more prevalent in patients with psychiatric disorders,especially those diagnosed with psychotic ***,this higher prevalence has been partially attributed to the potential ameliorative effects of nicotine on symptom severity and cognitive *** healthcare professionals and patients perceive there is a beneficial effect of nicotine on mental *** data show that the harm associated with nicotine in the population of patients with mental health conditions outweighs any potential *** paper will review the evidence surrounding the nicotinic system and schizophrenia,with a focus on any causality between nicotine and psychosis.

关键词： system attributed potential

Bianchi type-I cosmological models with perfect fluid in general relativity

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Research in Astronomy and Astrophysics 2010年第4期10卷 291-300页

作者： rishi Kumar Tiwari Department of Mathematics Govt.Model Science College

Einstein＇s field equations with variable gravitational and cosmological constants are considered in the presence of perfect fluid for the Bianchi type-I universe by assuming that the cosmological term is proportional to R-m （R is a scale factor and m is a constant）.A variety of solutions are *** physical significance of the respective cosmological models are also discussed.

关键词： cosmological parameters - cosmology: theory - relativity

Integrated approach of heavy metal pollution indices and complexity quantification using chemometric models in the Sirsa Basin, Nalagarh valley, Himachal Pradesh, India

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Chinese Journal Of Geochemistry 2015年第4期34卷 620-633页

作者： Rajkumar Herojeet Madhuri S.rishi Naval Kishore Department of Environment Studies Panjab University Department of Geology (CAS) Panjab University

Chemometric techniques and pollution assessment indices were applied to determine the source and intensity of pollution in the Sirsa River, Himachal Pradesh,India. Results show EC, Cr, Fe, Mn, and Ni were above the permissible limit as per the Bureau of Indian *** heavy metal pollution index(HPI) and contamination index(Cd) provided contrasting outcome and poor correlation was observed. A heavy metal evaluation index(HEI)method was developed using a multiple of the mean and correlation coefficient values to provide an alternative pollution classification. The criteria of HEI adopted for reclassification of HPI and Cdproduced comparable results; 40 % samples were labeled as low contamination,50 % as medium contamination, and 10 % as high contamination for all indices. Principal component analysis along with cluster analysis was used to identify the main factors responsible for degradation of water quality,namely discharge of industrial effluent, river bed mining,agricultural runoff, and minor natural or geogenic *** methods and chemometric study proposed here can be used as effective tools to gather information about water quality and water resource management.

关键词：化学计量学污染指数评价指标重金属印度盆地模型锡

A comprehensive review from hyperlink to intelligent technologies based personalized search systems

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Journal of Management Analytics 2019年第4期6卷 365-389页

作者： Dheeraj Malhotra O.P.rishi Department of Computer Science and Informatics University of KotaRajasthanIndia

In the present era of big data,web page searching and ranking in an efficient manner on the World Wide Web to satisfy the specific search needs of the modern user is undoubtedly a major challenge for search *** though a large number of web search techniques have been developed,some problems still exist while searching with generic search engines as none of the search engines can index the entire *** issue is not just the volume but also the relevance concerning the user’s ***,if the search query is partially incomplete or is ambiguous,then most of the modern search engines tend to return the result by interpreting all possible meanings of the *** search quality,more than half of the retrieved web pages have been reported to be *** web search personalization is required to retrieve search results while incorporating the user’s *** the proposed research work we have highlighted the strengths and weakness of various studies as proposed in the literature for web search personalization by carrying out a detailed comparison among *** in-depth comparative study with baselines leads to the recommendation of Intelligent Meta Search System(IMSS)and Advanced Cluster Vector Page Ranking(ACVPR)algorithm as one of the best approaches as proposed in the literature for web search ***,the detailed discussion about the comparative analysis of all categories gives new opportunities to think in different research areas.

关键词： web search personalization meta search tool machine learning big data analytics collaborative filtering logistic regression

Performance characterization of Bi_2O_3/Al nanoenergetics blasted micro-forming system

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Defence Technology（防务技术） 2019年第1期15卷 98-105页

作者： Vinay Kumar Patel rishi Kant Anu choudhary Madhusudan Painuly Shantanu Bhattacharya Department of Mechanical Engineering Govind Ballabh Pant Institute of Engineering & Technology Pauri-Garhwal Department of Mechanical Engineering Indian Institute of Technology Kanpur

This paper reports a novel micro-blast driven manufacturing process for micro-forming of Aluminum foils. The micro-blast is realized by using a nanoenergetic material system comprising of Bi_2O_3 microrods and aluminum particles. There is an enhanced need of forming of thin aluminum foil structures in small regions from point of view of drug packaging etc. The process developed caters to this need by using a single shot forming process using a micro-blast source. The micro-blast that is generated from an energetic composite system is made highly tunable by modulating the peak pressure generated through the blasting process and their impact in micro-forming of thin aluminum foils is observed through parametric studies. The engineering challenge involved in these experiments is to tune the blast pressure properties in order to address the forming of thin metal sheets with limiting boundary values as defined by the failure criteria. A variety of characterization techniques related to a thorough analysis of the synthesized material viz. X-ray diffraction(XRD), Scanning Electron Microscopy(SEM) etc, are used to tune the functional properties like gauge blast pressure etc, of material system. We have found a material system that can generate a maximum peak pressure of 73.8 MPa with pressurization rate of 2460 GPas^(-1) and that is able to accomplish micro-forming on thin metal foils(around 0.3 mm thickness). Experimental investigations demonstrate that tunabilty aspect of the energetic composites when exercised can enable variant processes such as embossing, coining, drilling etc. which may be of significant utility to drug packaging industries. A proper mathematical modeling of the forming process and critical process parameters therein have also been detailed.

关键词： Microforming Aluminum Foil Bi2O3 Nanoenergetic Tunability Process parameters

Assessment of single nucleotide polymorphisms associated with steroid-induced ocular hypertension

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International Journal of Ophthalmology(English edition) 2020年第8期13卷 1294-1305页

作者： Lakshmi Badrinarayanan Srujana Chitipothu Sharada Ramasubramanyan Sarangapani Sripriya Pukhraj rishi Ekta rishi Ronnie George Baddireddi Subhadra Lakshmi Sailaja VElchuri Department of Nano-biotechnology KNBIRVO blockVision Research FoundationChennaiTamilNadu 600006India Department of Biotechnology Anna UniversityChennaiTamilNadu 600025India Central Research Instrumentation Facility KNBIRVO blockVision Research FoundationTamilNadu 600006India RS.Mehta Jain Department of Biochemistry and Cell BiologyKNBIRVO blockVision Research FoundationChennaiTamilNadu 600006India SNONGC Department of Genetics and Molecular Biology KNBIRVO blockVision Research FoundationChennaiTamilNadu 600006India Shri Bhagwan Mahavir Vitreo-Retinal Service Medical Research FoundationChennaiTamilNadu 600006India Smt.Jadhavbai Nathamal Singhree Glaucoma Service Medical Research FoundationChennaiTamilNadu 600006India

AIM:To access the association of forty-eight single nucleotide polymorphisms(SNPs)identified from Caucasian population with steroid-induced ocular hypertension(OHT)in India ***:Fifty-four triamcinolone-acetonide(TA)and for ty-seven dexamethasone(Dex)administered subjects were enrolled in the study after a written *** pressure(IOP)values were recorded for a period of 6-month post steroid injections and patients were grouped as steroid-responders(SR:IOP≥21 mm Hg)and non-responders(NR:IOP≤20 mm Hg).Genomic DNA was isolated from peripheral venous ***-eight SNPs identified in TA treated Caucasian patients by genome wide association study(GWAS)were genotyped using iPLEXTM MassA RRAY among TA as well as Dex administered Indian *** data of 48 general subjects from a previous study were considered as reference controls for statistical *** frequencies were calculated and P-value,Chi-square and odds ratio at 95%confidenceinterval of group A(steroid treated vs controls),group B(SR vs NR),group C(phenotype correlation:influence of time,severity and gender on IOP rise),were calculated.P30 mm Hg)and immediate(<1 wk)among TA-SR patients while it was noticed to be mild(<30 mm Hg)and between 1-2 mo among Dex-SR *** regression for risk factor correlation with OHT remained non-significant,hence these factors were not considered as confounding parameters for further ***133,rs34016742,rs274554,rs10936746,rs274547,rs804854,rs7751500,rs359498,and rs7547448 SNPs significantly varied even after Bonferroni corrections(P<0.0025;group A).rs1879370(TA)and rs6559662(Dex)were significantly(P<0.05)associated with OHT(group B).rs133(severe IOP rise),rs11047639 and rs1879370(male gender),and rs11171569(immediate IOP rise)significantly(P<0.05)infl

关键词： triamcinolone-acetonide dexamethasone ocular hypertension single nucleotide polymorphisms diabetes neurodegeneration myopia

Lucrative pectinase production by novel strain Pseudozyma sp. SPJ with statistical optimization techniques using agro-industrial residues

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Frontiers in Biology 2014年第4期9卷 317-323页

作者： Sampriya SHARMA Jitender SHARMA rishi Pal MANDHAN Department of Biotechnology Kurukshetra University Kurukshetra 136119 India

Production of high titers of an alkaline, extracellular and thermo-tolerant pectinase by a newly isolated yeast Pseudozyma sp. SPJ was carried out under solid state fermentation. Citrus peel, the inexpensive agro-industrial residue used as substrate, was experienced to be unsurpassed. Response surface methodology was conducted to optimize the culture conditions for Pseudozyma sp. SPJ for hyper production of pectinase. Plackett Burman design was applied to identify the most effective culture variables. Out of nine variables studied, incubation time, moisture content and ammonium sulfate were detected as most important. A full factorial Central Composite Design was used to optimize the levels of these variables, which resulted in 17-fold increase （71.19 IU/g to 1215.66 IU/g dry substrate） in the enzyme yield. The results of analysis of variance and multiple regression analysis implies that the effect of incubation time （p 〈 0.000） and moisture content （p 〈 0.018） is more than ammonium sulfate. And also the interaction of moisture content with ammonium sulfate （p 〈 0.002） is more significant.

关键词： pectinase Pseudozyma sp. SPJ response surface methodology solid state fermentation

Development and performance characterization of a compact plasma focus based portable fast neutron generator

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Plasma Science and Technology 2020年第11期22卷 127-135页

作者： rishi VERMA Ekansh MISHRA Prosenjit DHANG Basanta Kumar DAS Manraj MEENA Lakshman RONGALI Archana SHARMA Pulsed Power&Electromagnetics Division Bhabha Atomic Research Centre FacilityAtchutapuramVishakhapatnam 531011.India Homi Bhabha National Institute AnushaktinagarMumbai 400094India Raja Ramanna Centre for Advanced Technology Rajendra NagarIndore 452013India Variable Energy Cyclotron Centre BidhannagarKolkata 700064India

The design details and performance characterization results of a newly developed plasma focus based compact and portable system(0.5 m×0.5 m×1.2 m,weighing≈100 kg)that produces an average neutron yield of^2×10^8 neutrons/shot(of fast D-D neutrons with typical energy^2.45 Me V)at^1.8 k J energy discharge are *** the detailed analysis of the experimental characterization and simulation results of this system,it has been conclusively revealed that specifically in plasma focus devices with larger static inductance:(i)pinch current is a reliable and more valid neutron yield scaling parameter than peak current,(ii)the ratio of pinch/peak current improves as static inductance of the system reduces,(iii)the benign role of the higher static/pinch inductance ratio enables the supply of inductively stored energy in densely pinched plasma with a larger time constant and it is well depicted by the extended dip observed in the discharge current trace,(iv)there is the need to redefine existing index values of the pinch(Ipinch^4.7)and peak(Ipeak^3.9)currents in neutron yield scaling equations to higher values.

关键词： plasma focus neutrons time of flight pinch current peak current plasma pinch pseudospark switch