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Study of Propagation of Ion Acoustic Waves in Argon Plasma

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Journal of Modern Physics 2010年第4期1卷 281-289页

作者： N. S. Suryanarayana Jagjeet Kaur vikas dubey 不详

The properties of small amplitude acoustic waves (IAW) in unmagnetised plasma have been discussed in detail. An experimental set up to study the propagation of IAW in argon plasma has been descried. The speed of IAW under different conditions of discharge current and pressure has been measured from the time-of flight technique. From these measurements, electron temperatures have been calculated. The results have been compared with those obtained by single probe method, and were found to be in good agreement with each other so IAW speeds can be used to calculate plasma parameters.

关键词： IAW in Argon Plasma Study of Propagation

TL Glow Curve Study, Kinetics, PL and XRD Analysis of Mn2+Doped CaAl2O4Phosphors

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Journal of Minerals and Materials Characterization and Engineering 2012年第11期11卷 1081-1084页

作者： Jagjeet Kaur Nemana Subramanyam Suryanarayana Beena Jaykumar vikas dubey Ravi Shrivastava Huma Nazli Baig Department of Physics Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg India

The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.

关键词： Phosphors Photoluminescence Thermoluminescence Kinetic Parameters Trap Depth

Targeting colorectal cancer using dietary flavonols

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Cancer Innovation 2024年第1期3卷 124-132页

作者： Nitin dubey Nidhi dubey Upendra Bhadoria Kamal Shah Nagendra Singh Chauhan IPS Academy College of Pharmacy IndoreMadhya PradeshIndia School of Pharmacy Devi Ahilya VishwavidyalayaIndoreMadhya PradeshIndia Institute of Pharmaceutical Research GLA UniversityMathuraUttar PradeshIndia Drugs Testing Laboratory Avam Anusandhan Kendra RaipurChhattisgarhIndia

Colorectal cancer is among the well-known forms of cancer and a prominent cause of cancer demises *** vitro experiments reinforced by animal studies,as well as epidemiological studies of human colorectal cancer propose that the growth of this disease can be moderated by eating *** intake including green vegetables and fruits may result in the reduction of colon cancer *** finding suggests that the combinations of dietary nutrients may deliver additive or synergistic effects and might be a powerful method to avoid or eradicate colon cancer beginning and/or *** are one of the most widespread dietary nutrients of the polyphenols-flavonoids and major constituent of Allium and Brassicaceae *** present in vegetables of Allium and Brassicaceae family are kaempferol,myricetin,quercetin,and *** flavonols are claimed to have antiproliferative activity in vivo and in vitro against colorectal *** objective of this review is to summarize the role of flavonols obtained from dietary sources in the prevention and treatment of colorectal cancer.

关键词： isorhamnetin kaempferol myricetin quercetin

Efficacy evaluation of standardized Rheum rhaponticum root extract(ERr 731®)on symptoms of menopause:A systematic review and meta-analysis study

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Journal of Biomedical Research 2024年第3期38卷 278-286页

作者： Vishal P.dubey Varun P.Sureja Dharmeshkumar B.Kheni Department of Scientific and Medical Affairs Sundyota Numandis Probioceuticals Pvt.Ltd.AhmedabadGujarat 380015India

Menopause is characterized by various physical,mental and emotional *** 731®is a standardized extract from Rheum rhaponticum root and has been clinically studied for its role in reducing menopausal *** current systematic review and meta-analysis aimed to evaluate the efficacy of ERr 731®supplementation in alleviating the severity of menopausal *** this review,we searched across three online databases up to March 2023,evaluated the quality of the included studies by the Physiotherapy Evidence Database scale,and assessed the risk of bias by the Cochrane Risk of Bias *** then performed a metaanalysis using RevMan software to estimate the pooled mean difference(MD).The study protocol was registered in the Prospective Register of Systematic Reviews(CRD42023416808).After screening and evaluation,we included four high-quality studies(a total of 390 participants;the ERr 731®group:193 participants;the control group:197 participants)in the *** results showed that ERr 731®supplementation significantly reduced the Menopause Rating Scale score(MD:–15.12;P<0.001),compared with control *** analysis revealed no effect of individual studies on the overall pooled estimate or overall observed *** current review provides evidence that ERr 731®supplementation is effective in reducing menopause *** bias and high heterogeneity in the results warrant further clinical studies.

关键词： menopause Rheum rhaponticum hot flashes systematic review

Comprehensive analysis of uncertainty quantification for the^(58)Ni(n,p)^(58)Co reaction cross section

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Chinese Physics C 2024年第9期48卷 170-175页

作者： Mahesh Choudhary Aman Sharma Namrata Singh Mahima Upadhyay Punit dubey A.Gandhi Akash Hingu G Mishra Sukanya De L.S.Danu Ajay Kumar R.G.Thomas Saurav Sood Sajin Prasad S.Mukherjee I.N.Ruskov Yu.N.Kopatch A.Kumar Department of Physics Banaras Hindu UniversityVaranasi 221005India Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN-HH Bucharest 077125Romania Department of Physics The Maharaja Sayajirao University of BarodaVadodara 390002India Nuclear Physics Division Bhabha Atomic Research CentreMumbai 400085India Health Physics Division Bhabha Atomic Research CentreMumbai 400085India Department of Electrical Power Engineering Brno University of TechnologyBrno 61600Czech Republic Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of SciencesSofia 1784Bulgaria Joint Institute for Nuclear Research(JINR) Dubna 141980Russia

In this study,we measured the^(58)Ni(n,p)^(58)Co reaction cross section with neutron energies of 1.06,1.86,and 2.85 *** cross section was measured using neutron activation techniques andγ-ray spectroscopy,and it was compared with cross section data available in the ***,we calculated the covariance matrix of the measured cross section for the aforementioned nuclear *** uncertainties of the theoretical calculation for^(58)Ni(n,p)^(58)Co reaction cross section were calculated via Monte Carlo *** this study,we used uncertainties in the optical model and level density parameters to calculate uncertainties in the theoretical cross *** theoretical calculations were performed by using *** this study,we aim to analyze the effect of uncertainties of the nuclear model input as well as different experimental variables used to obtain the values of reaction cross section.

关键词： ^(58)Ni(n p)^(58)Co reaction γ-ray spectroscopy uncertainty quantification of cross section covariance analysis

Upconversion nanoparticles:Recent strategies and mechanism based applications

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Journal of Rare Earths 2022年第9期40卷 1343-1359,I0001页

作者： Neha dubey Sudeshna Chandra Department of Chemistry Sunandan Divatia School of ScienceSVKM's NMIMS(Deemed to-be)UniversityVile Parle(West)Mumbai400056India

Upconversion nanoparticles(UCNPs)doped with lanthanides can convert near-infrared excitation into UV and visible *** of their relatively high emission efficiency,UCNPs are appealing materials for use in a variety of *** are known for low auto-fluorescence,excellent chemical and thermal photo-stability,deep tissue penetration,exceptional biocompatibility,low toxicity,color purity,and ease of surface *** this review,we explain a few recent strategies to boost the efficiency and luminescence of upconversion nanoparticles and minimize quenching by fabricating them as core/shell,nanofibers,or heavily doped *** of UCNPs in drug delivery,Photodynamic therapy(PDT),biosensors,bioimaging,and optogenetics are also discussed along with their mechanism of *** motivation for this review is to understand the working mechanism of UCNPs and their applications in various fields.

关键词： Luminescence Upconversion nanoparticles Optical imaging Mechanism Applications Rare earths

Fertilization and Soil Ploughing Practices under Changing Physical Environment Lead to Soil Organic Carbon Dynamics under Conservation Agriculture in Rice-Wheat Cropping System: A Scoping Review

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Agricultural Sciences 2024年第1期15卷 82-113页

作者： Salwinder Singh Dhaliwal Arvind Kumar Shukla Sanjib Kumar Behera Sarwan Kumar dubey Agniva Mandal Mehakpreet Kaur Randhawa Sharanjit Kaur Brar Gagandeep Kaur Amardeep Singh Toor Sohan Singh Walia Priyadarshani Arun Khambalkar Department of Soil Science Punjab Agricultural University Ludhiana India Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya Gwalior India Indian Institute of Soil Science (ISSS) Bhopal India Indian Council of Agricultural Research—Central Soil Salinity Research Institute (ICAR-CSSRI) Karnal India Department of Agricultural Chemistry and Soil Science Bidhan Chandra Krishi Viswavidyalaya Mohanpur India Department of Crop and Soil Sciences Washington State University Pullman USA School of Organic Farming Punjab Agricultural University Ludhiana India Department of Soil Science Rajmata Vijayaraje Sciendia Krishi Viswa Vidalaya Gwalior India

Ploughing and fertilization practices in rice-wheat system have deteriorated the soil carbon (C) pools. Conservation agriculture (CA) based management approaches have proven to enhance C sequestration and reverse the loss of soil-organic-carbon (SOC), which further enhances soil fertility. Different fractions of SOC pools react to the alterations in management practices and indicate changes in SOC dynamics as compared to total C in the soil. Higher SOC levels in soil have been observed in case of reduced/no-till (NT) practices than conventional tillage (CT). However, between CT and zero tillage/NT, total SOC stocks diminished with an increase in soil depth, which demonstrated that the benefits of SOC are more pronounced in the topsoil under NT. Soil aggregation provides physical protection to C associated with different-sized particles, thus, the improvement in soil aggregation through CA is an effective way to mitigate soil C loss. Along with less soil disturbance, residual management, suitable crop rotation, rational application of manures and fertilizers, and integrated nutrient management have been found to be effective in not only improving soil C stock but also enhancing the soil health and productivity. Thus, CA can be considered as a potential method in the build-up of SOC of soil in rice-wheat system.

关键词： Tillage Conservation Agriculture Soil Organic Carbon Carbon Fractions Rice-Wheat System Organic Amendments

Fuzzy least brain storm optimization and entropy-based Euclidean distance for multimodal vein-based recognition system

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Journal of Central South University 2017年第10期24卷 2360-2371页

作者： Dipti Verma Sipi dubey Department of CSE Vishwavidyalaya Engineering CollegeLakhanpurSarguja UniversityChhattisgarh 497001India Department of CSE Rungta College of Engineering and Technology(RCET)BhilaiChhattisgarh 490024India

Nowadays, the vein based recognition system becomes an emerging and facilitating biometric technology in the recognition system. Vein recognition exploits the different modalities such as finger, palm and hand image for the person identification. In this work, the fuzzy least brain storm optimization and Euclidean distance(EED) are proposed for the vein based recognition system. Initially, the input image is fed into the region of interest(ROI) extraction which obtains the appropriate image for the subsequent step. Then, features or vein pattern is extracted by the image enlightening, circular averaging filter and holoentropy based thresholding. After the features are obtained, the entropy based Euclidean distance is proposed to fuse the features by the score level fusion with the weight score value. Finally, the optimal matching score is computed iteratively by the newly developed fuzzy least brain storm optimization(FLBSO) algorithm. The novel algorithm is developed by the least mean square(LMS) algorithm and fuzzy brain storm optimization(FBSO). Thus, the experimental results are evaluated and the performance is compared with the existing systems using false acceptance rate(FAR), false rejection rate(FRR) and accuracy. The performance outcome of the proposed algorithm attains the higher accuracy of 89.9% which ensures the better recognition rate.

关键词： multimodality brain storm optimization (BSO) least mean square (LMS) score level fusion recognition

Stability and Bifurcation of a Prey-Predator System with Additional Food and Two Discrete Delays

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Computer Modeling in Engineering & Sciences 2021年第2期126卷 505-547页

作者： Ankit Kumar Balram dubey Department of Mathematics BITS PilaniPilani CampusPilani333031India

In this paper,the impact of additional food and two discrete delays on the dynamics of a prey-predator model is *** interaction between prey and predator is considered as Holling Type-II functional *** additional food is provided to the predator to reduce its dependency on the *** delay is the gestation delay in predator while the other delay is the delay in supplying the additional food to *** positivity,boundedness and persistence of the solutions of the system are studied to show the system as biologically *** existence of steady states,their local and global asymptotic behavior for the non-delayed system are *** is shown that(i)predator’s dependency factor on additional food induces a periodic solution in the system,and(ii)the two delays considered in the system are capable to change the status of the stability behavior of the *** existence of periodic solutions via Hopf-bifurcation is shown with respect to both the *** analysis shows that both delay parameters play an important role in governing the dynamics of the *** direction and stability of Hopf-bifurcation are also investigated through the normal form theory and the center manifold *** experiments are also conducted to validate the theoretical results.

关键词： predator delay system