检索结果-南通市图书馆

The redshift distribution of bL Lacs and FSRQs

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第1期19卷 131-140页

作者： David Garofalo chandra b.singh Dylan T.Walsh Damian J.Christian Andrew M.Jones Alexa Zack brandt Webster Matthew I.Kim Department of Physics Kennesaw State University The Raymond and beverly Sackler School of Physics and Astronomy Tel Aviv University Department of Physics & Astronomy California State University boise State University Computational Science & Engineering

Flat spectrum radio quasars(FSRQs) and bL Lacertae objects(bL Lacs) are powerful jet producing active galactic nuclei associated with supermassive black holes accreting at high and low Eddington rates, respectively. based on the Millennium Simulation, Gardner & Done have predicted their redshift distribution by appealing to ideas from the spin paradigm in a way that exposes a need for a deeper discussion on three interrelated issues:(1) an overprediction of bL Lacs compared to FSRQs;(2) a difference in FSRQ and bL Lac distributions;(3) a need for powerful but different jets at separated cosmic times. beginning with Gardner & Done's determination of Fermi observable FSRQs based on the distribution of thermal accretion across cosmic time from the Millennium Simulation, we connect FSRQs to bL Lacs by way of the gap paradigm for black hole accretion and jet formation to address the above issues in a unified way. We identify a physical constraint in the paradigm for the numbers of bL Lacs that naturally leads to separate peaks in time for different albeit powerful jets. In addition, we both identify as puzzling and ascribe physical significance to a tail end in the bL Lac curve versus redshift that is unseen in the redshift distribution for FSRQs.

关键词： black hole physics bL Lacertae objects:general galaxies:ets gamma-rays:galaxies

Influence of magnetic field on wave propagation at liquid-microstretch solid interface

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2011年第5期32卷 595-602页

作者： b.singh Department of Mathematics Post Graduate Government College

The reflection and refraction of a longitudinal wave at an interface between a perfectly conducting nonviscous liquid half-space and a perfectly conducting microstretch elastic solid half-space are studied. The appropriate solutions to the governing equations are obtained in both the half-spaces satisfying the required boundary conditions at the interface to obtain a system of five non-homogeneous equations in the amplitude ratios of various reflected and transmitted waves. The system is solved by a Fortran program of the Gauss elimination method for a particular example of an interface between water and aluminum-epoxy composite. Numerical values of the amplitude ratios are computed for a certain range of the incidence angle both in the presence and absence of an impressed transverse magnetic field. The effects of the presence of the transverse magnetic field on the amplitude ratios of various reflected and transmitted waves are shown graphically.

关键词： microstretch wave propagation reflection and transmission magnetic field

Graphene derivatives as efficient hole transport materials for lead-free double perovskite（Cs2SnI6） solar cells: a numerical study

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年第3期21卷 155-159页

作者： Sarita YADAV Saral K.GUPTA chandra Mohan singh NEGI Department of Physical Science Banasthali Vidyapith

The double perovskite Cs2SnI6has notable optical and electrical characteristics, rendering it a highly prospective candidate for deployment as the absorber layer in perovskite solar cells （PSCs）. We simulated the performance of PSCs using lead-free Cs2SnI6double perovskite absorber layer and graphene derivatives, namely graphene oxide （GO） and reduced graphene oxide （rGO）, as hole transport layers （HTLs）. Our findings show that r GO offers an excellent hole extraction property with minimal interfacial recombination compared to GO.

关键词：

同方期刊数据库

A Comprehensive Survey on Federated Learning Applications in Computational Mental Healthcare

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 49-90页

作者： Vajratiya Vajrobol Geetika Jain Saxena Amit Pundir Sanjeev singh Akshat Gaurav Savi bansal Razaz Waheeb Attar Mosiur Rahman brij b.Gupta Institute of Informatics and Communication University of DelhiDelhi110021India Maharaja Agrasen College University of DelhiDelhi110096India Computer Engineering Ronin InstituteMontclairNJ 07043USA Department of Research and Innovation Insights2TechinfoJaipur302001India University Centre for Research and Development(UCRD) Chandigarh UniversityChandigarh140413India Management Department College of Business AdministrationPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia CCRI&Department of Computer Science and Information Engineering Asia UniversityTaichung413Taiwan Symbiosis Centre for Information Technology(SCIT) Symbiosis International UniversityPune411057India Center for Interdisciplinary Research University of Petroleum and Energy Studies(UPES)Dehradun248007India

Mental health is a significant issue worldwide,and the utilization of technology to assist mental health has seen a growing *** aims to alleviate the workload on healthcare professionals and aid *** applications have been developed to support the challenges in intelligent healthcare ***,because mental health data is sensitive,privacy concerns have *** learning has gotten some *** research reviews the studies on federated learning and mental health related to solving the issue of intelligent healthcare *** explores various dimensions of federated learning in mental health,such as datasets(their types and sources),applications categorized based on mental health symptoms,federated mental health frameworks,federated machine learning,federated deep learning,and the benefits of federated learning in mental health *** research conducts surveys to evaluate the current state of mental health applications,mainly focusing on the role of Federated Learning(FL)and related privacy and data security *** survey provides valuable insights into how these applications are emerging and evolving,specifically emphasizing FL’s impact.

关键词： Depression emotional recognition intelligent healthcare systems mental health federated learning stress detection sleep behaviour

Nature of the Crust below the Achankovil Shear Zone,India based on Gravity Data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 200-201页

作者： Niraj Kumar A.P.singh b.singh National Geophysical Research Institute Room No.208Gravity Magnetic Study Group

Evolutionary history of continents and supercontinents, and their implications on solid earth processes, require an understanding of the growth of the continental crust through time and *** zones are the remnant regions inherited by Proterozoic tectonics between amalgamated terranes and the long-lived shear systems are commonly assumed to represent such *** such often debated is the

关键词： southern granulite terrane Achankovil shear zone terrane boundary gravity anomaly intracratonic litho-tectonic feature

Leelamine suppresses cMyc expression in prostate cancer cells in vitro and inhibits prostate carcinogenesis in vivo

在线全文

学校读者我要写书评

暂无评论

Journal of Cancer Metastasis and Treatment 2021年第1期7卷 242-253页

作者： Krishna b.singh Eun-Ryeong Hahm Shivendra V.singh Department of Pharmacology&Chemical biology University of Pittsburgh School of MedicinePittsburghPennsylvaniaPA15261USA UPMC Hillman Cancer Center University of Pittsburgh School of MedicinePittsburghPennsylvaniaPA 15213USA

Aim:Leelamine(LLM)inhibits the growth of human prostate cancer cells but the underlying mechanism is not fully *** present study was undertaken to determine the effect of LLM on cMyc,which is overexpressed in a subset of human prostate ***:The effect of LLM on cMyc expression and activity was determined by western blotting/confocal microscopy and luciferase reporter assay,respectively.A transgenic mouse model of prostate cancer(Hi-Myc)was used to determine the chemopreventive efficacy of ***:Exposure of androgen-sensitive(LNCaP)and castration-resistant(22Rv1)human prostate cancer cells to LLM resulted in downregulation of protein and mRNA levels of *** of cMyc partially attenuated LLM-mediated inhibition of colony formation,cell viability,and cell migration in 22Rv1 and/or PC-3 *** treatment decreased protein levels of cMyc targets(e.g.,lactate dehydrogenase),however,overexpression of cMyc did not attenuate these effects.A trend for a decrease in the expression level of cMyc protein was discernible in 22Rv1 xenografts from LLM-treated mice compared with control *** treatment(10 mg/kg body weight,5 times/week)was well-tolerated by Hi-Myc transgenic *** incidence of high-grade prostatic intraepithelial neoplasia,adenocarcinoma in situ,and microinvasion were lower in LLM-treated Hi-Myc mice but the difference was not statistically ***:The present study reveals that LLM inhibits cMyc expression in human prostate cancer cells in vitro but concentrations higher than 10 mg/kg may be required to achieve chemoprevention of prostate cancer.

关键词： Prostate cancer cMyc leelamine chemoprevention

Machine learned interatomic potentials using random features

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 48-57页

作者： Gurjot Dhaliwal Prasanth b.Nair chandra Veer singh Department of Mechanical and Industrial Engineering University of Toronto5 King’s College RdTorontoM5S 3G8ONCanada Institute for Aerospace Studies University of Toronto4925 Dufferin StTorontoM3H 5T6ONCanada Department of Materials Science and Engineering University of Toronto184 College StTorontoM5S 3E4ONCanada

We present a method to model interatomic interactions such as energy and forces in a computationally efficient *** proposed model approximates the energy/forces using a linear combination of random features,thereby enabling fast parameter estimation by solving a linear least-squares *** discuss how random features based on stationary and non-stationary kernels can be used for energy approximation and provide results for three classes of materials,namely two-dimensional materials,metals and *** and energy predictions made using the proposed method are in close agreement with density functional theory calculations,with training time that is 96%lower than standard kernel *** Dynamics calculations using random features based interatomic potentials are shown to agree well with experimental and density functional theory *** frequencies as computed by random features based interatomic potentials are within 0.1%of the density functional theory ***,the proposed random features-based potential addresses scalability issues encountered in this class of machine learning problems.

关键词： random stationary interatomic

biological Parts for Engineering Abiotic Stress Tolerance in Plants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

bioDesign Research 2022年第1期2022卷 395-435页

作者： Neeta Lohani Mohan b.singh Prem L.bhalla Plant Molecular biology and biotechnology Laboratory Faculty of Veterinary and Agricultural SciencesThe University of MelbourneParkvilleVIC 3010Australia

It is vital to ramp up crop production dramatically by 2050 due to the increasing global population and demand for ***, with the climate change projections showing that droughts and heatwaves becoming common in much of the globe,there is a severe threat of a sharp decline in crop yields. Thus, developing crop varieties with inbuilt genetic tolerance toenvironmental stresses is urgently needed. Selective breeding based on genetic diversity is not keeping up with the growingdemand for food and feed. However, the emergence of contemporary plant genetic engineering, genome-editing, and syntheticbiology offer precise tools for developing crops that can sustain productivity under stress conditions. Here, we summarize thesystems biology-level understanding of regulatory pathways involved in perception, signalling, and protective processesactivated in response to unfavourable environmental conditions. The potential role of noncoding RNAs in the regulation ofabiotic stress responses has also been highlighted. Further, examples of imparting abiotic stress tolerance by geneticengineering are discussed. Additionally, we provide perspectives on the rational design of abiotic stress tolerance throughsynthetic biology and list various bioparts that can be used to design synthetic gene circuits whose stress-protective functionscan be switched on/off in response to environmental cues.

关键词： protective crops precise

Chemical characteristics of trace metals in PM10 and their concentrated weighted trajectory analysis at Central Delhi,India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第5期29卷 184-196页

作者： Subhash chandra Monika J.Kulshrestha Ruchi singh Nahar singh CSIR-National Physical Laboratory New Delhi 110012 India. Academy of Scientific and Innovative Research (AcSIR) CSIR - National Physical Laboratory (CSIR-NPL) Campus New Delhi 110012 India Present address: Shriram Institute for Industrial Research Delhi 110007 India.

Trace metals associated with PM10 aerosols and their variation during day and nighttime as well as during different seasons have been studied for the year 2012. PCA analysis suggested5 PCs,which accounted for 86.8% cumulative variance. PC1 accounted for 30% with a significant loading of metals of anthropogenic origin,while PC2 showed 28% variance with the loading of metals of crustal origin. These trace metals showed seasonal distinct day and night time characteristics. The concentrations of Cu,Pb,and Cd were found to be higher during nighttime in all the seasons. Only Fe was observed with significantly higher mean concentrations during daytime of all seasons except monsoon. The highest mean values of Cu,Cd,Zn,and Pb during post-monsoon might be attributed to winds advection over the regions of waste/biomass burning and industrial activities in Punjab and Haryana ***,concentration weighted trajectory analysis suggested that metals of crustal origin were contributed by long-range transport while metals of anthropogenic and industrial activities were contributed by regional/local source regions.

关键词： Trace metals Potential source regions backward trajectory Principal component analysis