检索结果-南通市图书馆

Stimulated electromagnetic emissions spectrum observed during an X-mode heating experiment at the European Incoherent Scatter Scientific Association

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2019年第5期3卷 391-399页

作者： Xiang Wang Chen Zhou Tong Xu Farideh Honary Michael Rietveld vladimir Frolov Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China national Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave PropagationQingdao 266107China Department of Physics Lancaster UniversityLancaster LA1 4YBUK EISCAT Scientific Association N-9027 RamfjordmoenNorway Institute for Physics and Technology UiT The Arctic University of NorwayN-9037TromsφNorway Radiophysical Research Institute Nizhny Novgorod 603600Russia Kazan Federal University Kazan 420008Russia

An extraordinary(X-mode)electromagnetic wave,injected into the ionosphere by the ground-based heating facility at Tromsφ,norway,was utilized to modify the ionosphere on november 6,*** high-power high-frequency transmitter facility located at Tromsφ belongs to the European Incoherent Scatter Scientific *** the experiment,stimulated electromagnetic emission(SEE)spectra were observed.A narrow continuum occurred under cold-start conditions and showed an overshoot effect lasting several *** peaks occurred on both sides of the heating frequency only in the preconditioned ionosphere and also showed an overshoot *** SEE features are probably related to the ponderomotive process in the X-mode heating experiment and are helpful for understanding the physical mechanism that generated them during the X-mode heating *** features observed in the X-mode heating experiments are novel and require further investigation.

关键词： artificial ionosphere modification stimulated electromagnetic emissions extraordinary electromagnetic wave European Incoherent Scatter Scientific Association(EISCAT)

Anodic Alumina Photonic Crystals as Refractive Index Sensors for Controlling the Composition of Liquid Mixtures

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2020年第2期10卷 147-154页

作者： Matin ASHUROV vladimir GORELIK Kirill nAPOLSKII Sergey KLIMOnSKY Faculty of Materials Science Lomonosov Moscow State UniversityLeninskie GoryMoscow 119991Russia P.n.Lebedev Physical Institute Russian Academy of SciencesMoscow 119991Russia Bauman Moscow State Technical University Moscow 105005Russia Department of Chemistry Lomonosov Moscow State UniversityLeninskie GoryMoscow 119991Russia

Photonic crystals based on anodic aluminum oxide films are examined as refractive index sensors for controlling the composition of water-alcohol liquid *** position of the reflectance maximum corresponding to the first photonic stop band is used as the analytical *** of a photonic crystal with water-ethanol and water-glycerol mixtures results in a redshift of the reflectance maximum.A fairly high refractive index sensitivity,sufficient to determine the composition of water-ethanol and water-glycerol mixtures with an accuracy of about 1 wt.%,is *** detailed dependencies of the analytical signal on the composition of mixtures are experimentally investigated and compared with numerical *** and limitations of the refractive index sensors based on anodic alumina photonic crystals are discussed.

关键词： Photonic crystal anodic alumina sensor refractive index

High-performance and broadband photodetection of bicrystalline(Gan)_(1-x)(ZnO)_(x)solid solution nanowires via crystal defect engineering

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 Materials Science & Technology 2021年第26期85卷 255-262页

作者： Zongyi Ma Gang Li Xinglai Zhang Jing Li Cai Zhang Yonghui Ma Jian Zhang Bing Leng natalia Usoltseva vladimir An Baodan Liu School of Materials Science and Engineering Liaoning Technical UniversityFuxin 123000China Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Structure Analysis Division Testing CenterInstitute of Metal ResearchChinese Academy of ScienceShenyang 110016China Department of Plastic Surgery The First Affiliated Hospital of China Medical UniversityShenyang 110001China School of Advanced Manufacturing Technologies National Research Tomsk Polytechnic University30 Lenin Ave.Tomsk 634050Russia

Crystal defect engineering is widely used as an effective approach to regulate the optical and optoelectronic properties of semiconductor ***,photogenerated electron-hole pair recombination centers caused by structural defects usually lead to the reduction of optoelectronic *** this work,a high-performance photodetector based on(Gan)_(1-x)(ZnO)_(x)solid solution nanowire with bicrystal structure is fabricated and it shows excellent photoresponse to ultraviolet and visible *** highest responsivity of the photodetector is as high as 60,86 and 43 A/W under the irradiation of365 nm,532 nm and 650 nm,*** corresponding response time is as fast as 170,320 and 160 *** wide spectral responses can be attributed to various intermediate energy levels induced by the introduction of various structural defects and dopants in the solid solution ***,the peculiar bicrystal boundary along the axial direction of the nanowire provides two parallel and fast transmission channels for photo-generated carriers,reducing the recombination of photo-generated *** findings provide a valued example using crystal defect engineering to broaden the photoresponse range and improve the photodetector performance and thus can be extended to other material systems for various optoelectronic applications.

关键词： (Gan)1-x(ZnO)x nanowires Photodetectors Broadband photodetection Crystal defect engineering

About one form of writing of the Hardy-Weinberg law

在线全文

学校读者我要写书评

暂无评论

natural Science 2013年第6期5卷 724-728页

作者： Andrey n. Volobuev Peter I. Romanchuk vladimir K. Malishev Samara State Medical University Samara Russia

On the basis of the Hardy-Weinberg law written down for a continuous scale of alternation of generations, populating dynamics of genome is considered at absence of mutagen influence and at presence of the mutagen factor of stochastic character. Influence of the stochastic mutagen factor as cancerogenes on the population is shown. In the countries with the homogeneous population and advanced medicine, it inevitably results in growth of death rate of the population from?newgrowths to proportional a root square from time of a life of the population. The carried out research allows estimate a level of the population condition in the country from the point of view of health.

关键词： Stochastic Mutagen Factor newgrowths Allele Alternation of Generations

Dissociation behavior of “dry water” C_3H_8 hydrate below ice point:Effect of phase state of unreacted residual water on a mechanism of gas hydrates dissociation

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 Energy Chemistry 2015年第3期24卷 309-314页

作者： Andrey O Drachuk vladimir P Melnikov nadezhda S Molokitina Anatoliy n nesterov Lev S Podenko Aleksey M Reshetnikov Andrey Yu Manakov Institute of Earth Cryosphere SB RAS625026Malygin str.86TyumenRussian Federation Tyumen State Oil and Gas University 625000Volodarsky str.38TyumenRussian Federation nikolaev Institute of Inorganic Chemistry SB RAS630090Lavrentiev av.3NovosibirskRussian Federation

The results on a dissociation behavior of propane hydrates prepared from ＂dry water＂ and contained unreacted residual water in the form of ice inclusions or supercooled liquid water（water solution of gas） were presented for temperatures below 273 *** temperature ramping or pressure release method was used for the dissociation of propane hydrate *** was found that the mechanism of gas hydrate dissociation at temperatures below 273 K depended on the phase state of unreacted water in the hydrate *** hydrates dissociated into ice and gas if the ice inclusions were in the hydrate *** samples of propane hydrates with inclusions of unreacted supercooled water only（without ice inclusions） dissociated into supercooled water and gas below the pressure of the supercooled water-hydrate-gas metastable equilibrium.

关键词： gas hydrates dry water supercooled liquid water ice hydrate dissociation

Climate change evidence in tree growth and stand productivity at the upper treeline ecotone in the Polar Ural Mountains

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2020年第1期7卷 76-91页

作者： nadezhda M.Devi vladimir V.Kukarskih Аrina A.Galimova Valeriy S.Mazepa Andrey A.Grigoriev Institute of Plant and Animal Ecology Ural BranchRussian Academy of Sciences8 Marta202/3Ekaterinburg 620144Russia

Background:Recent warming is affecting species composition and species areal distribution of many ***,although most treeline studies have estimated the rates of forest expansion into tundra,still little is known about the long-term dynamic of stand productivity at the forest-tundra ***,we make use of tree-ring data from 350 larch(Larix sibirica Ledeb.)and spruce(Picea obovata Ledeb.)sampled along the singular altitudinal treeline ecotone at the Polar Urals to assess the dynamic of stand establishment and productivity,and link the results with meteorological observations to identify the main environmental ***:The analysis of stand instalment indicated that more than 90%of the living trees appeared after *** this period,the stand became denser and moved 50m upward,while in recent decades the trees of both species grew *** maximum afforestation occurred in the last decades of the twentieth century,and the large number of encountered saplings indicates that the forest is still *** upward shift coincided with a slight increase of May-August and nearly doubling of September-April precipitation while the increase in growth matched with an early growth season warming(June+0.27°C per decade since 1901).This increase in radial growth combined with the stand densification led to a 6-90 times increase of biomass since ***:Tree-ring based twentieth century reconstruction at the treeline ecotone shows an ongoing forest densification and expansion accompanied by an increased *** changes are driven by climate change mechanism,whereby the leading factors are the significant increase in May-June temperatures and precipitation during the dormant *** of phytomass accumulation mechanisms within treeline ecotone is valuable for improving our understanding of carbon dynamics and the overall climate balance in current treeline ecosystems and for predicting how these will be altered by global ch

关键词： Polar Urals Treeline Productivity Climate change Radial growth Recruitment Larch Spruce

Element selection for functional materials discovery by integrated machine learning of elemental contributions to properties

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 639-648页

作者： Andrij Vasylenko Dmytro Antypov vladimir V.Gusev Michael W.Gaultois Matthew S.Dyer Matthew J.Rosseinsky Department of Chemistry University of LiverpoolCrown StreetLiverpool L697ZDUnited Kingdom Department of Computer Science University of LiverpoolAshton StreetLiverpool L693BXUnited Kingdom

The unique nature of constituent chemical elements gives rise to fundamental differences in *** materials based on their phase fields,defined as sets of constituent elements,before specific differences emerge due to composition and structure can reduce combinatorial complexity and accelerate screening,exploiting the distinction from composition-level *** and evaluation of novelty of materials classes align with the experimental challenge of identifying new areas of *** address this,we present PhaseSelect,an end-to-end machine learning model that combines representation,classification,regression and novelty ranking of phase *** leverages elemental characteristics derived from computational and experimental materials data and employs attention mechanisms to reflect the individual element contributions when evaluating functional performance of phase *** demonstrate this approach for high-temperature superconductivity,high-temperature magnetism,and targeted bandgap energy applications,showcasing its versatility and potential for accelerating materials exploration.

关键词： materials phase elements

neutrons in a nanosecond low-pressure discharge in deuterium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2016年第4期1卷 207-212页

作者： Victor F.Tarasenko Mikhail I.Lomaev Dmitry A.Sorokin Boris A.nechaev vladimir n.Padalko Gennady n.Dudkin Laboratory of Optical Radiation of the Institute of High Current Electronics SB RAS Tomsk 634055Russia Physical Technical Institute National Research Tomsk Polytechnic UniversityTomsk 634050Russia national Research Tomsk State University Tomsk 634050Russia

Stable neutron generation with a yield of ~1.2×10^(4) neutrons per pulse was obtained during d(d,n)^(3)He reaction initiated by the high-voltage nanosecond discharge in a gap with a potential tungsten cylinder(anode)and a grounded deuterated zirconium plate(cathode)filled with deuterium at a pressure of ~10^(2) *** duration of the neutron pulse was ~1.5 *** intensive neutron emission was registered without deuterated *** of material of the tungsten electrode was observed during the high-voltage nanosecond discharge in the deuterium,hydrogen,helium and argon at pressures of 10^(2)-10^(4) Pa.

关键词： neutrons Deuterium High-voltage nanosecond discharge Low-pressure Thermonuclear reaction

Industrial and wildfire aerosol pollution over world heritage Lake Baikal

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 2021年第9期33卷 49-64页

作者： Olga Popovicheva Elena Molozhnikova Sergey nasonov vladimir Potemkin Ivan Penner Marina Klemasheva Irina Marinaite Ludmila Golobokova Stergios Vratolis Konstantinos Eleftheriadis Tamara Khodzher Institute of nuclear Physics Lomonosov Moscow State UniversityLeninskie Gory1119991 MoscowRussia Limnological Institute Siberian Branch of the Russian Academy of SciencesUlan-Batorskaya Str.3Irkutsk 664033Russia Zuev Institute of Atmospheric Optics Siberian Branch of the Russian Academy of SciencesAcademician Zuev square1Tomsk 634055Russia Institute of nuclear&Radiological Sciences&Technology Energy&SafetyN.C.S.R.“Demokritos”Athens 15310Greece

Lake Baikal is the biggest reservoir of fresh water with unique flora and fauna;presently it is negatively affected by climate change, water warming, industrial emissions, shipping,touristic activities, and Siberian forest *** assessment of air pollution-related Baikal’s ecosystem damage is an unsolved ***, based expedition exploring the Baikal atmospheric aerosol loading, was performed over the lake area in July *** combine the aerosol near-water and vertical distributions over the Lake Baikal basin with meteorological observations and air mass transportation *** sounding of aerosol fields in the troposphere assesses the atmospheric background in the pristine areas and the pollution during fire-affected *** optical properties(scattering and spectral absorption) converted to the particle number size, black carbon(BC) mass, and Absorption Angstrom Exponent(AAE) provide the inside into aerosol *** of industrial emissions from Krasnoyarsk and Irkutsk regions, and wildfire plumes from Republic of Yakutia relates the pollution sources to the increased concentrations of fine particle numbers, PM_(10) and BC mass over Southern and northern/Central Baikal, *** highest PM10 and BC are associated to the harbor and touristic areas of intensive shipping and residential biomass *** estimates applied to aerosol data exhibit the pollution fluxes to water surface over the whole Baikal *** marks the impact of coal combustion, residential biomass burning, and wildfires indicating the high pollution level of the Lake Baikal ecological system.

关键词： Environmental impacts Aerosol pollution Ecosystem Industrial emissions Wildfires Coal combustion Shipping