检索结果-南通市图书馆

Function fitting for modeling seasonal normalized difference vegetation index time series and early forecasting of soybean yield

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2022年第5期10卷 1452-1459页

作者： alexey stepanov Konstantin Dubrovin Aleksei Sorokin Far Eastern Agriculture Research Institute Vostochnoe680521 KhabarovskRussia Computing Center of the Far Eastern Branch of the Russian Academy of Sciences 680000 KhabarovskRussia

Forecasting crop yields based on remote sensing data is one of the most important tasks in *** is the main crop in the Russian Far *** is desirable to forecast soybean yield as early as possible while maintaining high *** study aimed to investigate seasonal time series of the normalized difference vegetation index(NDVI) to achieve early forecasting of soybean *** research used data from the Moderate Resolution Image Spectroradiometer(MODIS),an arable-land mask obtained from the VEGA-Science web service,and soybean yield data for 2008-2017 for the Jewish Autonomous Region(JAR) *** approximating functions were fitted to model the NDVI time series:Gaussian,double logistic(DL),and quadratic and cubic *** the period from calendar weeks 22-42(end of May to mid-October),averaged over two districts,the model using the DL function showed the highest accuracy(mean absolute percentage error-4.0%,root mean square error(RMSE)-0.029,P <0.01).The yield forecast accuracy of prediction in the period of weeks 25-30 in JAR municipalities using the parameters of the Gaussian function was higher(P <0.05) than that using the other *** mean forecast error for the Gaussian function was 14.9% in week 25(RMSE was0.21 t ha) and 5.1%-12.9% in weeks 26-30(RMSE varied from 0.06 to 0.15 t ha) according to the2013-2017 *** weeks 31-32,the error was 5.0%-5.4%(RMSE was 0.07 t ha) using the Gaussian parameters and 7.4%-7.7%(RMSE was 0.09-0.11 t ha) for the DL *** the method was applied to municipal districts of other soy-producing regions of the Russian Far *** was0.14-0.32 t hain weeks 25-26 and did not exceed 0.20 t hain subsequent weeks.

关键词： NDVI Function fitting Early prediction Yield Soybean

Silica-based nanoarchitecture for an optimal combination of photothermal and chemodynamic therapy functions of Cu2–xS cores with red emitting carbon dots

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第12期17卷 2144-2155页

作者： alexey stepanov Svetlana Fedorenko Kirill Kholin Irek Nizameev alexey Dovzhenko Rustem Zairov Tatiana Gerasimova Alexandra Voloshina Anna Lyubina Guzel Sibgatullina Dmitry Samigullin Asiya Mustafina Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center of RASKazan 420088Russia Department of Physics Kazan National Research Technological UniversityKazan 420015Russia Department of Nanotechnology in Electronics Kazan National Research Technical University named after A.N.Tupolev-KAIKazan 420111Russia Kazan(Volga region)Federal University Kazan 420008Russia Kazan Institute of Biochemistry and Biophysics FRC Kazan Scientific Center of RASKazan 420111Russia

This study introduces multifunctional silica nanoparticles that exhibit both high photothermal and chemodynamic therapeutic activities,in addition to *** activity of the silica nanoparticles is derived from their plasmonic properties,which are a result of infusing the silica nanoparticles with multiple Cu2-xS *** infusion process is facilitated by a recoating of the silica nanoparticles with a cationic *** key factors that enable the internal incorporation of the Cu2-xS cores and the external deposition of red-emitting carbon dots are *** Cu2-xS cores within the silica nanoparticles exhibit both self-boosting generation of reactive oxygen species and high photothermal conversion efficacy,which are essential for photothermal and chemodynamic *** silica nanoparticles’small size(no more than 70 nm)and high colloidal stability are prerequisites for their cell *** internalization of the red-emitting silica nanoparticles within cells is visualized using fluorescence microscopy *** chemodynamic activity of the silica nanoparticles is associated with their dark cytotoxicity,and the mechanisms of cell death are evaluated using an apoptotic *** photothermal activity of the silica nanoparticles is demonstrated by significant cell death under near-infrared(1064 nm)irradiation.

关键词： copper sulfide nanoparticles chemodynamic therapy photothermal therapy carbon dots silica nanoparticles

Convection and Stratification of Temperature and Concentration

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第6期20卷 1351-1364页

作者： alexey Fedyushkin Laboratory of Complex Fluid Mechanics Ishlinsky Institute for Problems in Mechanics RASMoscow119526Russia

This study is devoted to an analysis of natural convection and the emergence of delamination in an incompressible fluid encapsulated in a closed region heated from the ***,medium and intensive modes of stationary laminar thermal and thermo-concentration convection are *** is shown that nonlinear flow features can radically change the flow structure and characteristics of heat and mass ***,the temperature and concentration segregation in the center of the square region display a non-monotonic dependence on the Grashof number(flow intensity).The formation of a nonstationary periodic structure of thermal convection in boundary layers and in the core of a convective flow in the closed region is also *** of the formation of countercurrents inside the region with the direction opposite to the main convective flow are ***,the influence of vertical and horizontal vibrations on oscillatory convection is analyzed in detail.

关键词： Natural convection stratification segregation numerical simulation vibrations

Method for passivation of propellant residues in orbital stage tank of launch vehicle

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第1期37卷 64-76页

作者： Valeriy TRUSHLYAKOV Ivan LESNYAK alexey PANICHKIN Department of Aviation and Rocket Building Omsk State Technical UniversityOmsk 644050Russia Sobolev Institute of Mathematics of the Siberian Branch of Russian Academy of Sciences Novosibirsk 630090Russia

The problem of removing unused liquid propellant residues from the tanks of spent spacecraft and orbital stages of Launch Vehicles(LV)leads to their explosion and the formation of space debris in *** provide a solution to this problem,a method for removing liquid propellant residues from the LV tanks after the mission completion is *** method is based on the gasification of liquid propellant residues in the tanks under acoustic-vacuum exposure and the discharge of the gasification products into the surrounding outer *** investigations were carried out on a Ground-based Experimental Installation(GEI)to determine the coefficient of heat transfer from the surface of an acoustic radiator to a *** obtained coefficient was then used to calculate the energy costs for the gasification of *** estimates are given on the example of the tank with kerosene residues from a spent second stage of the LV“Soyuz-2.1 v”.The optimal discharge rate at which kerosene does not freeze is 0.14 m^(3)/***,the acoustic exposure leads to an increase in the mass of evaporated kerosene over a given time by96.1%,and the energy costs are 1756.7 kJ(approximately 50% of the remaining electrical energy).

关键词： Propellant Weightlessness Liquid evaporation Heat and mass transfer Acoustics Vacuum Vapor bubbles

Advances in laser-plasma interactions using intense vortex laser beams

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 14-42页

作者： Yin Shi Xiaomei Zhang alexey Arefiev Baifei Shen Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026China Department of Physics Shanghai Normal UniversityShanghai 200234China Department of Mechanical and Aerospace Engineering University of California at San DiegoLa JollaCA 92093USA

Low-intensity light beams carrying orbital angular momentum(OAM),commonly known as vortex beams,have garnered significant attention due to promising applications in areas ranging from optical trapping to *** recent years,there has been a surge in global research exploring the potential of high-intensity vortex laser beams and specifically their interactions with *** paper provides a comprehensive review of recent advances in this *** with conventional laser beams,intense vortex beams exhibit unique properties such as twisted phase fronts,OAM delivery,hollow intensity distribution,and spatially isolated longitudinal *** distinct characteristics give rise to a multitude of rich phenomena,profoundly influencing laser-plasma interactions and offering diverse *** paper also discusses future prospects and identifies promising general research areas involving vortex *** areas include low-divergence particle acceleration,instability suppression,high-energy photon delivery with OAM,and the generation of strong magnetic *** growing scientific interest and application potential,the study of intense vortex lasers is poised for rapid development in the coming years.

关键词： intense vortex laser orbital angular momentum laser plasma interactions high power laser high energy density science

Molecular deconvolution of the neutralizing antibodies in duced by an in activated SARS-CoV-2 virus vaccine

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2021年第10期12卷 818-823页

作者： Xingdong Zhou Hui Wang Qun Ji Mingjuan Du Yuexia Liang Huanhuan Li Fan Li Hang Shang Xiujuan Zhu Wei Wang Lichun Jiang alexey V.stepanov Tianyu Ma Nanxin Gong Xiaodong Jia Alexander G.Gabibov Zhiyong Lou Yinying Lu Yu Guo Hongkai Zhang Xiaoming Yang State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences Nankai UniversityTianjin 300071China Beijing Institute of Biological Products Company Limited Beijing 100176China Shanghai Institute for Advanced Immunochemical Studies ShanghaiTech UniversityShanghai 201210China M.M.Shemyakin and Yu.A.OvchinniXov Institute of Bioorganic Chemistry of the Russian Academy of Sciences MoscowRussia 117997 Comprehensive Liver Cancer Center The 5th Medical Center of PLA General HospitalBeijing 100039China MOE Key Laboratory of Protein Science&Collaborative Innovation Center of Biotherapy School of MedicineTsinghua UniversityBeijing 100084China

Dear Editor,The rapid emerge nee and persistence of the pan demic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has had enormous impacts on global health and the *** vaccines against SARS-CoV-2 are urgently needed to control the coronavirus disease 2019(COVID-19)pandemic,and multiple vaccines have been found to be efficacious in preventing symptomatic COVID-19(Polack et al.,2020;Wu et al.,2020;Jones and Roy,2021).

关键词： acute respiratory

Efficient cold atom source from a single-layer atom chip

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第6期22卷 103-108页

作者： Petr Skakunenko Darya Bykova Anton Afanasiev alexey Kalmykov Roman Kirtaev Victor Balykin Institute of Spectroscopy Russian Academy of Sciences Moscow 108840Russia Moscow Institute of Physics and Technology Moscow 141700Russia Skolkovo Institute of Science and Technology Moscow 121205Russia National Research University Higher School of Economics Moscow 101000Russia Present affiliation:Emerging Technologies Research Center XPANCEODubaiUnited Arab Emirates

We developed a new single-layer atom chip with an additional U-shaped current-carrying *** new U-shaped microwire creates optimized magnetic field distribution,which increases the trapping volume of a magneto-optical trap(MOT) near the *** approach allows one to localize more atoms,while a setup remains relatively simple (single-layer approach) and consumes low current (up to 10 A). The total number of trapped^(87)Rb atoms in our setup is 5×10^(7).

关键词： atom chip cold atoms laser cooling magneto-optical trap U-MOT

Influence of the Atlantic Multidecadal Oscillation and Interdecadal Pacific Oscillation on Antarctic surface air temperature during 1900 to 2015

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第3期43卷 48-58页

作者： Cuijuan Sui Lejiang Yu alexey YuKarpechko Licheng Feng Shan Liu Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing 100081China Key Laboratory for Polar Science Polar Research Institute of ChinaMinistry of Natural ResourcesShanghai 200136China Finnish Meteorological Institute HelsinkiFI-00101Finland

The importance of the Atlantic Multidecadal Oscillation(AMO)and Interdecadal Pacific Oscillation(IPO)in influencing zonally asymmetric changes in Antarctic surface air temperature(SAT)has been ***,previous studies have primarily concentrated on examining the combined impact of the contrasting phases of the AMO and IPO,which have been dominant since the advent of satellite observations in *** study utilizes long-term reanalysis data to investigate the impact of four combinations of+AMO+IPO,–AMO–IPO,+AMO–IPO,and–AMO+IPO on Antarctic SAT over the past 115 ***+AMO phase is characterized by a spatial mean temperature amplitude of up to 0.5℃over the North Atlantic Ocean,accompanied by positive sea surface temperature(SST)anomalies in the tropical eastern Pacific and negative SST anomalies in the extratropical-mid-latitude western Pacific,which are indicative of the+IPO *** Antarctic SAT exhibits contrasting spatial patterns during the+AMO+IPO and+AMO–IPO ***,during the–AMO+IPO period,apart from the Antarctic Peninsula and the vicinity of the Weddell Sea,the entire Antarctic region experiences a warming *** most pronounced signal in the SAT anomalies is observed during the austral autumn,whereas the combination of–AMO and–IPO exhibits the smallest magnitude across all the *** wavetrain excited by the SST anomalies associated with the AMO and IPO induces upper-level and surface atmospheric circulation anomalies,which alter the SAT ***,downward longwave radiation anomalies related to anomalous cloud cover play a crucial *** the future,if the phases of AMO and IPO were to reverse(AMO transitioning to a negative phase and IPO transitioning to a positive phase),Antarctica could potentially face more pronounced warming and accelerated melting compared to the current observations.

关键词： Atlantic Multidecadal Oscillation(AMO) Interdecadal Pacific Oscillation(IPO) surface air temperature Antarctic wavetrain Rossby wave source

Modified Biot Elastic Coefficients in Poroelastic Solid

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第4期35卷 1397-1401页

作者： Chun Yang Yun Wang alexey Stovas Liheng Wang School of Geophysics and Information Technology China University of GeosciencesBeijing100083China Department of Geoscience and Petroleum Norwegian University of Science and TechnologyTrondheim 7031Norway Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

0 INTRODUCTION Sedimentary rocks predominantly consist of porous solids saturated with fluids,the kinematic and dynamic characteristics of which are described through poroelasticity theory(Biot,1956a,b,1941).The wave propagation in fluid-saturated po-rous rocks obtains extensive attention owing to its relevance in diverse fields,such as ocean acoustics,exploration geophysics,and soil dynamics(Yang et al.,2023a;Xie et al.,2022).

关键词： saturated Elastic a,b