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Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption

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Communications in Theoretical Physics 2015年第7期64卷 103-107页

作者： Niti Kant manzoor ahmad Wani Department of Physics Lovely Professional University

Density transition based self-focusing of cosh-Gaussian laser beam in plasma with linear absorption has been studied. The field distribution in the plasma is expressed in terms of beam width parameter, decentered parameter,and linear absorption coefficient. The differential equation for the beam width parameter is solved by following Wentzel–Kramers–Brillouin(WKB) and paraxial approximation through parabolic wave equation approach. The behaviour of beam width parameter with dimensionless distance of propagation is studied at optimum values of plasma density,decentered parameter and with different absorption levels in the medium. The results reveal that these parameters can affect the self-focusing significantly.

关键词： self-focusing cosh-Gaussian beam plasma density ra

Fragility and challenges of health systems in pandemic: lessons from India's second wave of coronavirus disease 2019 (COVID-19)

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Global Health Journal 2022年第1期6卷 44-49页

作者： manzoor ahmad Malik Department of Humanities and Social Sciences Indian Institute of Technology RoorkeeRoorkeeHaridwar 247667India

The unprecedented healthcare demand due to sudden outbreak of coronavirus disease 2019 (COVID-19) pandemic has almost collapsed the health care systems especially in the developing world. Given the disastrous outbreak of COVID-19 second wave in India, the health system of country was virtually at the brink of collapse. Therefore, to identify the factors that resulted into breakdown and the challenges, Indian healthcare system faced during the second wave of COVID-19 pandemic, this paper analysed the health system challenges in India and the way forward in accordance with the six building blocks of world health organization (WHO). Applying integrated review approach, we found that the factors such as poor infrastructure, inadequate financing, lack of transparency and poor healthcare management resulted into the overstretching of healthcare system in India. Although health system in India faced these challenges from the very beginning, but early lessons from first wave should have been capitalized to avert the much deeper crisis in the second wave of the pandemic. To sum-up given the likely future challenges of pandemic, while healthcare should be prioritized with adequate financing, strong capacity-building measures and integration of public and private sectors in India. Likewise fiscal stimulus, risk assessment, data availability and building of human resources chain are other key factors to be strengthened for mitigating the future healthcare crisis in country.

关键词： Healthcare Coronavirus disease 2019(COVID-19)Pandemics Health financing Health crisis Second wave Third wave India

Relativistic Self-Focusing of Hermite-cosine-Gaussian Laser Beam in Collisionless Plasma with Exponential Density Transition

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Communications in Theoretical Physics 2019年第6期71卷 736-740页

作者： Vishal Thakur manzoor ahmad Wani Niti Kant Department of Physics Lovely Professional UniversityPhagwara-144411PunjabIndia Govt.Higher Secondary School Waterhail Budgam-191111J&KIndia

This work reveals an exploration of self-focusing of Hermite-cosine-Gaussian laser beam in a collisionless plasma under relativistic nonlinearity. Self-focusing along with self-trapping of Hermite-cosine-Gaussian laser beam are analyzed for different values of laser intensity, plasma density, and decentered parameters. Mathematical analysis displays that these parameters play a major role in achieving the stronger and earlier self-focusing. Further, a comparative study between self-focusing of Hermite-cosine-Gaussian laser beam with and without exponential density ramp profile is introduced. Plasma density transition with exponential profile is found to be more effective in order to have stronger self-focusing. The present analysis may lead to very useful applications in the field of efficient harmonic generation, laser driven fusion etc.

关键词： self-focusing collisionless plasma exponential plasma density ramp Hermite-cosine-Gaussian laser beam

Variable stars in M37

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Research in Astronomy and Astrophysics 2018年第12期18卷 111-122页

作者： Ajaz ahmad Dar Padmakar Singh Parihar Parvej Saleh manzoor ahmad Malik Department of Physics University of KashmirHazratbal 190006Srinagar-J&KIndia Department of Physics Islamia College of Science and CommerceHawalSrinagar-19002J&KIndia Indian Institute of Astrophysics Koramagala-560034BangaloreIndia Applied Sciences Department GowhatiUniversity of AssamIndia

The CCD photometric observations of open star cluster M37(NGC 2099) were carried out up to a limiting magnitude of V ～ 20 in both B and V filters to search for variable stars using a 2k×4k CCD and the 1.3 m telescope at the Vainu Bapu Observatory, Kavalur.A total of 314 stars were in the first observing run, out of which 60 were identified as *** out of the identified 60 variables are classified as W UMa binary *** model fitting, we used PHOEBE based on the W-D code to estimate the physical parameters of these newly detected W UMa binaries that theoretically best match the observed light curves.

关键词： techniques:photometric astronomical instrumentation methods and techniques astrometry and celestial mechanics (stars:) binaries:eclipsing

Studying the patterns of alien and native floras of some habitats in Srinagar city, Kashmir, India

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Ecological Processes 2015年第1期4卷 17-28页

作者： Syed Mubashir Andrabi Zafar ahmad Reshi manzoor ahmad Shah Salman Qureshi Department of Botany University of KashmirSrinagar 190006Jammu and KashmirIndia Department of Geography Humboldt University of BerlinRudower Chaussee 1612489 BerlinGermany School of Architecture Birmingham City UniversityThe Parkside Building5 Cardigan StreetBirmingham B47BDUK

Introduction:Urban flora is an important component of human-dominated ecosystems that links urban dwellers with *** study aims at compiling and analysing the alien and native vascular plant species of some selected habitats in the Srinagar city,Kashmir,***:Bi-seasonal sampling was employed and each habitat type(viz.,graveyards,grasslands,orchards and wastelands)was sampled at seven different ***:The number of species recorded from graveyards was 96;from grasslands 112;141 from orchards and 110 from *** level of invasion among habitats varied from 67.27%to 68.75%,with a mean value of 67.86%;out of clubbed species list,64.84%were ***,Poaceae,Brassicaceae and Fabaceae were the biggest families in all four habitat ***:Our research shows that across habitats,alien plant species are the predominant part of their floras.

关键词： Alien Flora Herbs Srinagar city Level of invasion

Modified Differential Transform Method for Solving Black-Scholes Pricing Model of European Option Valuation Paying Continuous Dividends

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Journal of Partial Differential Equations 2023年第4期36卷 381-393页

作者： ahmad manzoor MISHRA Rajshree JAIN Renu School of Mathematics and Allied Sciences jiwaji UniversityGwalior-474011India Govt.Model Science College Gwalior-474011India

.Option pricing is a major problem in quantitative *** Black-Scholes model proves to be an effective model for the pricing of *** this paper a com-putational method known as the modified differential transform method has been em-ployed to obtain the series solution of Black-Scholes equation with boundary condi-tions for European call and put options paying continuous *** proposed method does not need discretization to find out the solution and thus the computa-tional work is reduced *** results are plotted graphically to establish the accuracy and efficacy of the proposed method.

关键词： European option pricing Black-Scholes equation call option put option modified differential transform method

Environmental perspectives of microplastic pollution in the aquatic environment:a review

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Marine Life Science & Technology 2020年第4期2卷 414-430页

作者： manzoor ahmad Jia-Ling Li Pan-Deng Wang Wael NHozzein Wen-Jun Li State Key Laboratory of Biocontrol Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)School of Life SciencesSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUriimqi 830011China Bioproducts Research Chair Zoology DepartmentCollege of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Botany and Microbiology Department Faculty of ScienceBeni-Suef UniversityBeni-Suef 65211Egypt

Microplastics are a highly concerning pollutant that have gained attention from the scientific community and other regulatory authorities due to their potential risks to organisms and *** are widespread in both terrestrial and aquatic ecosystems and can be found even in Antarctica and deep-sea *** ability to survive for long periods in the environment and their aptitude of inter-and intra-environmental translocation can prompt poor environmental *** adsorption of heavy metals and other toxic persistent organic pollutants is a further cause for ***,microplastics enable the development of a distinct microbial niche within an ecosystem,which could potentially impair ecosystem function by promoting the growth of selective microbial *** acquisition of metal-resistant,antibiotic-resistant genes,and the enrichment of antibiotic-resistant bacteria on microplastic surfaces have recently been ***,some studies have also reported the colonizahon of pathogenic bacterial strains such as Vibrio *** microplastic *** review aims to address the sources of microplastic pollution in the freshwater and marine environments and to discuss their potential functions in the environment.

关键词： Microplastic Heavy metals Pollutant reservoir Distinct microbial habitat Gene exchange

Photometry and spectroscopy ofⅡPeg,IM Peg and UX Ari

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Research in Astronomy and Astrophysics 2018年第9期18卷 79-88页

作者： Ajaz ahmad Dar Padmakar Singh Parihar manzoor ahmad Malik Department of Physics University of KashmirHazratbal 190006 Srinagar-J&KIndia Department of Physics Islamia College of Science and CommerceHawalSrinagar-19002J&KIndia Indian Institute of Astrophysics Koramagala-560034BangaloreIndia

Ⅴ band photometry of three RS CVn stars,Ⅱ Peg, IM Peg and UX Ari, is carried out to study the physical properties of these variables. We verified the significant and regular optical photometric variability to be present in all three stars. The strong photometric variability and emission of Hα and Ca Ⅱ H ＆ K using high resolution optical spectroscopy with the Hanle Echelle Spectrograph （HESP）, which operates in conjunction with the Himalayan Chandra Telescope, verify the strong chromospheric activity which is present in RS CVn stars. The photometric studies of Ⅱ Peg, UX Ari and IM Peg were subjected to light curve analysis for spot parameters using a two-starspot model.

关键词： RS CVn star spots chromospherically active

Evaluation of biomarkers, genetic mutations, and epigenetic modifications in early diagnosis of pancreatic cancer

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World Journal of Gastroenterology 2021年第36期27卷 6093-6109页

作者： Bilal Rah manzoor ahmad Banday Gh Rasool Bhat Omar J Shah Humira Jeelani Fizalah Kawoosa Tahira Yousuf Dil Afroze Advanced Centre for Human Genetics Sher-i-Kashmir Institute of Medical SciencesSrinagar 190011Jammu and KashmirIndia Department of Medical Oncology Sher-i-Kashmir Institute of Medical SciencesSrinagar 190011Jammu and KashmirIndia Department of Surgical Gastroenterology Sher-i-Kashmir Institute of Medical SciencesSrinagar 190011Jammu and KashmirIndia Department of Immunology and Molecular Medicine Sher-i-Kashmir Institute of Medical ScienceSrinagar 190011Jammu and KashmirIndia

BACKGROUND Pancreatic cancer(PC)is one of the deadliest malignancies with an alarming mortality *** significant advancement in diagnostics and therapeutics,early diagnosis remains elusive causing poor prognosis,marred by mutations and epigenetic modifications in key genes which contribute to disease *** To evaluate the various biological tumor markers collectively for early diagnosis which could act as prognostic biomarkers and helps in future therapeutics of PC in Kashmir *** A total of 50 confirmed PC cases were included in the study to evaluate the levels of carbohydrate antigen 19-9(CA 19-9),tissue polypeptide specific antigen(TPS),carcinoembryonic antigen(CEA),vascular endothelial growth factor-A(VEGF-A),and epidermal growth factor receptor(EGFR).Mutational analysis was performed to evaluate the mutations in Kirsten rat sarcoma(KRAS),Breast cancer type 2(BRCA-2),and deleted in pancreatic cancer-4(DPC-4)***,epigenetic modifications(methylation of CpG islands)were performed in the promoter regions of cyclin-dependent kinase inhibitor 2A(p16;CDKN2A),MutL homolog 1(hMLH1),and Ras association domain-containing protein 1(RASSF1A)*** We found significantly elevated levels of biological markers CA 19-9(P≤0.05),TPS(P≤0.05),CEA(P≤0.001),and VEGF(P≤0.001).Molecular genetic analysis revealed that KRAS gene mutation is predominant in codon 12(16 subjects,P≤0.05),and 13(12 subjects,P≤0.05).However,we did not find a mutation in DPC-4(1203G>T)and BRCA-2(617delT)***,epigenetic modification revealed that CpG methylation in 21(P≤0.05)and 4 subjects in the promoter regions of the p16 and hMLH1 gene,*** In conclusion,CA 19-9,TPS,CEA,and VEGF levels were significantly elevated and collectively have potential as diagnostic and prognostic markers in *** data of mutation in the KRAS gene commonly in codon 12 and rare in codon 13 could augment the predisposition towards ***,methylatio

关键词： Pancreatic cancer Genetic mutations Epigenetic modifications Biomarkers Risk factors Diagnostics