期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
Spatial analysis of vegetation cover response to climate trends in Khakassia(South Siberia)
1
作者 IM Sergei 《Journal of Mountain Science》 SCIE CSCD 2023年第10期2869-2884,共16页
An analysis of the changes in vegetation cover on the territory of the Republic of Khakassia in 2000–2021 due to climatic trends was carried out based on the MODIS data.The changes in vegetation cover were estimated ... An analysis of the changes in vegetation cover on the territory of the Republic of Khakassia in 2000–2021 due to climatic trends was carried out based on the MODIS data.The changes in vegetation cover were estimated based on trends in Normalized Difference Vegetation Index(NDVI)and Enhanced Vegetation Index(EVI).In general,in the 21st century,an increase in the biomass of vegetation cover is observed.Positive trends were observed in 16%–22%of the territory,and negative only in 1%–3%.For about 20%of the analyzed territory,a significant influence of climate on the changes in vegetation cover was revealed.The most pronounced negative impact on vegetation cover was caused by summer air and soil temperatures,spring temperature,and summer winds,and the positive impact was caused by summer precipitation and soil moisture.The response of the vegetation cover to climate was non-uniform concerning the topography.Thus,a significant correlation with the amount of precipitation was observed for~20%–35%of vegetation growing below 600 m above sea level and for less than 5%above this elevation.The negative effect of summer temperatures on plants prevailed mainly at an elevation below~1400 m above sea level.Projected climate change is likely to lead to significant degradation of vegetation in the steppe and foreststeppe in Khakassia in the coming decades. 展开更多
关键词 Khakassia South Siberia Vegetation cover Climate trends Remote sensing MODIS NDVI EVI RELIEF
下载PDF
Geological Model of Pre-Jurassic Heterogeneous Basement and Hydrocarbon Productivity Prediction of “Oil-and-Gas Bearing Contact Zone Horizon” Between Paleozoic and Mesozoic Deposits of Ostaninskoye and Severoostaninskoye Oil-and-Gas Fields(Western Siberi
2
作者 Kseniya I.Kanakova 《地学前缘》 EI CAS CSCD 北大核心 2009年第S1期157-158,共2页
This work is devoted to the analysis of the formation conditions and geologic model of Paleozoic basement rocks of a number of oil-and-gas fields, located in Tomsk region(South of West-Siberian Oil-and-Gas Province,Ru... This work is devoted to the analysis of the formation conditions and geologic model of Paleozoic basement rocks of a number of oil-and-gas fields, located in Tomsk region(South of West-Siberian Oil-and-Gas Province,Russia).The research is based on integrated data interpretation of seismic exploration, well logging and deep drilling.The study is at the interfaces between exploration geophysics 展开更多
关键词 seismic interpretation OIL content prediction well-logging data reservoir modeling
下载PDF
Factors and mechanisms of chemical composition formation of saline lakes in West Mongolia
3
作者 Marina KOLPAKOVA Stepan SHVARTSEV +3 位作者 Vitalyi ISUPOV Sodov ARIUNBILEG Alexander VLADIMIROV Olga GASKOVA 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期142-144,共3页
All the lakes are accumulative systems for the various chemical elements.However,the ratios of the elements in different lake types are very different.It is generally accepted that the composition of lake water determ... All the lakes are accumulative systems for the various chemical elements.However,the ratios of the elements in different lake types are very different.It is generally accepted that the composition of lake water determined by 展开更多
关键词 saline lakes Mongolia system water-rock GEOCHEMISTRY EVAPORATION
下载PDF
Laws of Jet Mixing of the Swirled Flows in a Pipe
4
作者 Nikolay Shishkin 《Journal of Energy and Power Engineering》 2013年第7期1223-1230,共8页
Results of experimental research of the mixing process of coaxial flows in a pipe with swirled peripheral jet are presented in this paper. Distribution of temperature and concentration of gases on the axis and wall of... Results of experimental research of the mixing process of coaxial flows in a pipe with swirled peripheral jet are presented in this paper. Distribution of temperature and concentration of gases on the axis and wall of the channel under the influence of such factors as the regime flow, ratio of density of flows and swirl degree of the peripheral jet are studied. Research of temperature, swirl angle, circulation in cross sections along with the channel have shown that their distributions have the jet-like character and are described by known dependences for the layer of mixture. 展开更多
关键词 Film cooling adiabatic jet mixing swirl flow.
下载PDF
Selenga River human dispersal path in Initial Upper Paleolithic
5
作者 Evgeny P RYBIN Arina M KHATSENOVICH 《人类学学报》 CSCD 北大核心 2024年第5期780-796,共17页
Here,we consider earlier Upper Paleolithic sites in the Selenga River Basin,the main fluvial input of Lake Baikal that flows through northern Mongolia and the southwestern Transbaikal region of Russia.Lithic industrie... Here,we consider earlier Upper Paleolithic sites in the Selenga River Basin,the main fluvial input of Lake Baikal that flows through northern Mongolia and the southwestern Transbaikal region of Russia.Lithic industries from these sites can be attributed to the laminar Initial Upper Paleolithic(IUP)technocomplex,widespread in southern Siberia and Central Asia.IUP industries appear in the Selenga Basin about 45 kaBP cal.Aspects of regional typological variability and the transport of exotic raw materials over long distances indicate that these populations participated in developed exchange networks and employed high mobility targeting the acquisition of necessary raw materials.Two site types are present:quarry-workshops in northern Mongolia and generalized activity settlements in the southwestern Transbaikal.Although faunal data are limited,we interpret available information as indicating a specialization on hunting,focusing on migrating steppe game species.The distribution of sites in the mid-altitudes and landscapes of the Selenga-Orkhon geographical region and the geomorphological homogeneity of this territory also supported interregional human moves during the IUP. 展开更多
关键词 Central Asia Initial Upper Paleolithic MIGRATION raw material HUNTING
下载PDF
Russian M&A Market:Dynamics and Current State
6
作者 Larissa Lugacheva Maria Musatova 《Management Studies》 2019年第4期325-337,共13页
We identify five phases in the formation of M&A from the beginning until the newest developments when economic sanctions were imposed.The paper summarizes the results of empirical analysis of mergers and acquisiti... We identify five phases in the formation of M&A from the beginning until the newest developments when economic sanctions were imposed.The paper summarizes the results of empirical analysis of mergers and acquisitions(M&A)of Russian companies over the period 1995-2013.To capture the time series behaviour of M&A processes,we fit an autoregressive integrated moving average(ARIMA)model.We further analysed co-integration of M&A processes in Russia and US,China,and Germany.The results indicate German and Chinese M&A series have a long-term influence on Russian series,while no significant causal links were evidenced in the dataset between US and Russian series. 展开更多
关键词 mergers and ACQUISITIONS CROSS-BORDER deals ARIMA COINTEGRATION
下载PDF
Passive vectoring of entomopathogenic fungus Beauveria bassiana among the wax moth Galleria mellonella larvae by the ectoparasitoid Habrobracon hebetor females 被引量:6
7
作者 Vadim Yu. Kryukov Natalia A. Kryukova +2 位作者 Maksim V. Tyurin Olga N. Yaroslavtseva Viktor V. Glupov 《Insect Science》 SCIE CAS CSCD 2018年第4期643-654,共12页
Females of the ectoparasitoid Habrobracon hebetor attack and envenomate numerous host individuals during oviposition. The vectoring of the entomopathogenic fungus Beauveria bassiana during the adhesion stage by ectopa... Females of the ectoparasitoid Habrobracon hebetor attack and envenomate numerous host individuals during oviposition. The vectoring of the entomopathogenic fungus Beauveria bassiana during the adhesion stage by ectoparasitoid females among the wax moth larvae Galleria mellonella was explored under laboratory conditions. Vectoring occurred both from infected parasitoids to wax moth larvae and from infected to healthy wax moth larvae by parasitoids. The efficacy of vectoring in both cases was dose dependent. Parasitoid females were unable to recognize infected larvae in a labyrinth test. In addition, the presence of H. hebetor females significantly (1.5-13 fold) increased the mycoses level in clusters of G. mellonella, with 40% of the larvae infected with ftmgal conidia. Envenomation by H. hebetor increased conidia germination on the cuticles of the wax moth larvae by 4.4 fold. An enhanced germination rate (2 fold) was registered in the n- hexane epicuticular extract of envenomated larvae compared to that of healthy larvae. Both envenomation and mycoses enhanced the phenoloxidase (PO) activity in the integument of G. mellonella and, in contrast, decreased the encapsulation rate in hemolymphs. We hypothesize that changes in the integument property and inhibition of cellular immunity provide the highest infection efficacy of entomopathogenic fungi with H. hebetor. 展开更多
关键词 Galleria mellonella IMMUNITY integuments MYCOSES PARASITOID vectoring
原文传递
Microbial Processes in Stratified Lake Doroninskoe(Transbaikal Region)
8
作者 Savelii BURIUKHAEV Bair NAMSARAEV Vyacheslav DAMBAEV 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期125-126,共2页
In recent decades,meromictic ponds attract the attention of researchers in different directions,because here the character of the physical,chemical and biological processes differ from those of typical mixing waters(K... In recent decades,meromictic ponds attract the attention of researchers in different directions,because here the character of the physical,chemical and biological processes differ from those of typical mixing waters(Kuznetsov,1970;Hutchinson,1969).In Transbaikalia widely distributed soda and salt lakes with different salinity.Notable among them is Lake Doroninskoye,which has a pronounced stratification for a 展开更多
关键词 Lake Doroninskoe microbial community activity of microbial processes PHOTOSYNTHESIS dark fixation of CO2 sulfate reduction cycle of sulfur.
下载PDF
Comparative Analysis for Different Mathematical Models in Electron Optics
9
作者 Valentin Ivanov 《Journal of Chemistry and Chemical Engineering》 2014年第10期990-995,共6页
The comparative analysis of modem mathematical models for 3D problems in electron optics is presented. The new approach to solve the electron optics problems in three dimensions is presented. It is based on the princi... The comparative analysis of modem mathematical models for 3D problems in electron optics is presented. The new approach to solve the electron optics problems in three dimensions is presented. It is based on the principal ray method suggested by G. Grinberg in 1948. That perspective approach was not realized before for full three-dimensional electron optic systems, probably because of the complexity of its mathematical apparatus. We describe the analytical technique of the BEM (boundary element method) for the field evaluation, and 3rd order aberration expansion for the trajectory analysis. The first version of such computer code "OPTICS-3" and some results of numerical simulations with this code were presented. 展开更多
关键词 Electron optics aberration theory analytical technique boundary element method.
下载PDF
Report on Late Paleozoic bimodal volcanic associations discovered in Northern Mongolian Rift zone
10
作者 Yuri D Shcherbakov Alexander B Perepelov Svetlana S Tsypukova 《China Geology》 2020年第3期496-500,共5页
1.Objectives Within the Northern-Mongolian–Transbaikalian Rift system,bimodal volcanic associations with felsic agpaitic rocks are widespread,often accompanied by alkaline granites plutons.There are two segments in t... 1.Objectives Within the Northern-Mongolian–Transbaikalian Rift system,bimodal volcanic associations with felsic agpaitic rocks are widespread,often accompanied by alkaline granites plutons.There are two segments in the Rift system structure–Northern-Mongolian with length of 600 km and Western-Transbaikalian with length of 800 km on latitude.Most western appearances of alkaline granites and bimodal magmatism are Bat-Tsengel,Upper-Hanui and Orkhont plutons(Vorontsov AA et al.,2007). 展开更多
关键词 VOLCANIC LATITUDE PALEOZOIC
下载PDF
Nanosize Magnetic Films and Powders Prepared by Extraction-Pyrolysis Technique
11
作者 N. Patrusheva Tamara P. Polyakova Klavdiya +3 位作者 A. Seredkin Vladimir N. Komogorcev Sergey V. Patrushev Valery S. Patrin Gennady 《材料科学与工程(中英文版)》 2010年第2期19-25,共7页
关键词 纳米磁性薄膜 粉体技术 萃取 铁氧体薄膜 制备 裂解 晶粒尺寸 磁性纳米微粒
下载PDF
Li2MoO4 Crystals Grown by Low-Thermal-Gradient Czochralski Technique
12
作者 Veronika Grigorieva Vladimir Shlegel +10 位作者 Tatyana Bekker Nina Ivannikova Andrea Giuliani Pierre de Marcillac Stefanos Mamieros Valentina Novati Emiliano Olivieri Denys Poda Claudia Nones Anastasiia Zolotarova Fedor Danevich 《材料科学与工程(中英文B版)》 2017年第2期63-70,共8页
下载PDF
新疆阿尔泰全新世双湖沉积物正构烷烃分布及其环境意义 被引量:11
13
作者 赵佳玉 王淑贤 +3 位作者 Andrey Darin 孙青 董浩伟 储国强 《第四纪研究》 CAS CSCD 北大核心 2021年第4期965-975,共11页
文章对新疆阿尔泰双湖沉积物进行了古气候、古环境变化研究。双湖(48°52'N,87°02'E)位于阿尔泰山中部,是山谷岩石滑塌阻塞形成的堰塞湖,湖长约1200 m,宽度约300 m,最大水深9 m。项目使用重力钻在双湖中心钻取了172 c... 文章对新疆阿尔泰双湖沉积物进行了古气候、古环境变化研究。双湖(48°52'N,87°02'E)位于阿尔泰山中部,是山谷岩石滑塌阻塞形成的堰塞湖,湖长约1200 m,宽度约300 m,最大水深9 m。项目使用重力钻在双湖中心钻取了172 cm无扰动岩芯,根据核素测年(^(137)Cs,^(210)Pb,AMS^(14)C)建立了9.1 cal.ka B.P.以来的时间标尺,以正构烷烃分布特征(ACL_(23~33)、nC_(27)/nC_(31)、P_(aq))为指标,重建了该区的古植被、古气候变化。沉积物中正构烷烃以高碳数为主,中长链正构烷烃存在显著的奇碳优势。链长指标(ACL_(23~33))、nC_(27)/nC_(31)指标、Paq之间具有很强的相关性关系,表明指标可能受到相似的气候驱动因素影响,反映了区域植被和湖泊水生生物的演替历史:9.1~8.8 cal.ka B.P.期间水生植被输入较少,陆生植被中草本植物相对占比较高;8.8~3.3 cal.ka B.P.期间大型水生植物大量繁殖,汇水区木本植物增多;3.3 cal.ka B.P.至今湖泊周围的木本植物减少,草本植物相对占比增多,水生植物输入减少。双湖沉积物ACL_(23~33)指标自9.1 cal.ka B.P.以来呈逐渐增加的趋势,可能表明温度逐渐增加,这一结果与前人在该区利用泥炭br-GDGT重建的温度序列具有相似的变化趋势,但在百-千年尺度上,温度变化不一致,可能与指标的敏感性和定年精度有关。 展开更多
关键词 正构烷烃 分布特征 全新世 阿尔泰山 双湖
原文传递
Fungal infection dynamics in response to temperature in the lepidopteran insect Galleria mellonella 被引量:2
14
作者 Vadim Y. Kryukov Olga N. Yaroslavtseva +7 位作者 Miranda M. A. Whitten Maksim V. Tyurin Katherine J. Ficken Carolyn Greig Nadja R. Melo Viktor V. Glupov Ivan M. Dubovskiy Tariq M. Butt 《Insect Science》 SCIE CAS CSCD 2018年第3期454-466,共13页
This study examines how the dynamics of fungus-insect interactions can be modulated by temperature. The wax moth, Galleria mellonella, is a well-studied and important model insect whose larvae in the wild develop opti... This study examines how the dynamics of fungus-insect interactions can be modulated by temperature. The wax moth, Galleria mellonella, is a well-studied and important model insect whose larvae in the wild develop optimally at around 34 ℃ in beehives. However, surprisingly little research on wax moths has been conducted at relevant temperatures. In this study, the entomopathogenic fungus Metarhizium robertsii inflicted rapid and substantial mortality on wax moth larvae maintained at a constant temperature of 24 ℃, but at 34 ℃ a 10 fold higher dose was required to achieve an equivalent mortality. The cooler temperature favored fungal pathogenicity, with condial adhesion to the cuticle, germination and hemocoel invasion all significantly enhanced at 24 ℃, compared with 34 ℃. The wax moth larvae immune responses altered with the temperature, and with the infective dose of the fungus. Enzyme-based immune defenses (lysozyme and phenoloxidase) exhibited enhanced activity at the warmer temperature. A dramatic upregulation in the basal expression of galiomicin and gallerimycin was triggered by cooling, and this was augmented in the presence of the fungus. Profiling of the predominant insect epicuticular fatty acids revealed a 4-7 fold increase in palmetic, oleic and linoleic acids in larvae maintained at 24 ℃ compared with those at 34 ℃, but these failed to exert fungistatic effects on topically applied fungus. This study demonstrates the importance of choosing environmental conditions relevant to the habitat of the insect host when determining the dynamics and outcome of insect/fungus interactions, and has particular significance for the application of entomopathogens as biocontrol agents. 展开更多
关键词 BIOCONTROL entomopathogenic fungus IMMUNITY METARHIZIUM TEMPERATURE
原文传递
τ lepton decays
15
作者 S.Eidelman 《Chinese Physics C》 SCIE CAS CSCD 2010年第6期896-901,共6页
We discuss recent results on τ lepton physics obtained at the BABAR, Belle and KEDR detectors They include tests of lepton universality using new measurements of T lepton mass and some branching fractions Also descri... We discuss recent results on τ lepton physics obtained at the BABAR, Belle and KEDR detectors They include tests of lepton universality using new measurements of T lepton mass and some branching fractions Also described are selected results on τ lepton hadronic decays coming from BABAR and Belle. 展开更多
关键词 lepton universality lepton mass measurements hadronic branching fractions
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部