检索结果-南通市图书馆

Chinese Journal Of Geochemistry 2015年第4期34卷 601-609页

作者： Yanling An yiliang Hou Qixin Wu Lin Qing Longbo Li Key Laboratory of Karst Environment and Geohazard Prevention Ministry of Education Guizhou University State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang Engineering Corporation China Power

The Sanchahe River in southwest China is a tributary of the Wujiang River and experiences high erosion rates. Geochemical analysis was conducted on Sanchahe River basin samples collected in the wet and dry seasons of 2014 in order to better understand local chemical weathering processes, anthropogenic influences, and associated CO2 consumption. The samples' total dissolved solid concentrations were found to be significantly higher than that of the global river average. Ca2+was the dominant cation in the samples and accounted for 64 % and73 % of the total cations in the dry and wet seasons,respectively. HCO3-and SO42-were the dominant anions,accounting for 92 % of the total anions. Stoichiometry analyses of the river waters suggested that the water chemistry is controlled by carbonate dissolution by both carbonic and sulfuric acid. The chemical weathering rates of carbonate and silicate evaporites in the Sanchahe River basin were estimated to be approximately 109.2 and 11.0 t/(km2a), respectively, much higher than both the global mean values and the Wujiang River, a typical karstic *** CO2 consumption by carbonate and silicate weathering are estimated to be 597.4 9 103 and 325.5 9 103mol/(km2a), which are much higher than corresponding values in the Wujiang River, indicating a high erosion rate in the Sanchahe River basin.

关键词：化学风化中国西南 CO2 消耗量岩溶侵蚀率阳离子总量地球化学分析

Accumulation model and geochemistry characteristics of oil occurring from Jurassic coal measures in the Huangling mining area of the Ordos Basin, China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第1期17卷 158-169页

作者： Yuan BAO yiliang HU Wenbo WANG Chen GUO Guochang WANG College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Xi’an 710021China Engineering Department Saint Francis UniversityLorettoPA 15940USA

The Ordos Basin is an important intracontinental sedimentary basin in China,containing a significant amount of coal,oil,and natural *** study analyzed the sedimentary environment,sedimentary facies,parent material type,maturity,and carbon isotopic composition of the coal-bearing organic matter using gas chromatography–mass spectrometry(GC–MS)and stable isotope ratio mass *** source of oil occurring in the No.2 coal seam of the Jurassic Yan’an Formation(An-1 oil)and its accumulation model were also *** results show that the relative abundances of C_(27),C_(28),and C_(29) steranes in the An-1 oil are 43.8%,33.0%,and 23.2%,*** tricyclic terpanes,C_(29)20S/(20S+20R),and C_(29)ββ/(ββ+αα)contents of the An-1 oil are 31.4%−34.8%,0.85 and 0.81,***/n-C17,Ph/n-C18,and Pr/Ph values are 0.34,0.42,and 0.87,*** parameters indicate that the An-1 oil mainly comes from the plankton source rock deposited in the freshwater lake facies and a reducing environment,which has evolved to *** correlation of oil-oil indicates that the An-1 oil is homologous to the Chang-7 oil(Chang-7 member of the Triassic Yanchang Formation).The correlation of oil-source rock presents that the An-1 oil is generated from the Yanchang Formation(Chang-6 and Chang-7 source rocks)and occurred in the coal seam during the stage of stratum uplift since the Early of Late *** distribution characteristics of δ13C group components in the An-1 oil and Chang-7 oil also reveal the fractionation phenomenon during the migration of crude oil.

关键词： coal measures oil source biomarker compounds carbon isotope Ordos Basin

Carbon isotope anomaly in marbles associated with eclogites from the Dabie Mountains

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第2期43卷 155-160页

作者： Yongfei Zheng Bin Fu Bing Gong Yilin Xiao yiliang Li Univ Sci & Technol China Dept Earth & Space Sci Hefei 230026 Peoples R China

This is a report of carbon isotope anomaly in marbles associated with the UHP eclogites from the Dabie Mountains. The results place constraints on the degree of crust_mantle interaction during the UHP metamorphism.

关键词： carbon isotopes marble and eclogite UHP metamorphism crust_mantle interaction Dabie Mountains.

A new compressibility modification k-ε turbulence model with shock unsteadiness effect

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第24期53卷 3798-3807页

作者： HAN XingSi YE TaoHong ZHU MinMing CHEN yiliang Department of Thermal Science and Engineering University of Science and Technology of China Hefei 230027 China

A new compressibility modification k-ε model,including shock unsteadiness effect and the previous compressibility modification of pressure dilatation and dilatational dissipation rate,was developed with a simple formulation for numerical simulation in supersonic complex turbulent *** shock unsteadiness effect was modeled by inhibiting turbulent kinetic energy production in the governing equations of turbulent kinetic energy and the turbulent kinetic energy dissipation ***'s correction models were employed accounting for the dilatational compressibility effects in the new *** types of flows,the free supersonic mixing layers and complex supersonic flow with transverse injection were simulated with different flow *** with experimental data of the free supersonic mixing layers showed that the new compressibility modification k-ε model significantly inhibited the excessive growth of turbulent kinetic energy and improved *** the supersonic mixing layer flows,prediction results with the new model were in close agreement with experimental data,accurately predicting the decreasing trend of the mixing layer spreading rate with the increase of the convective Mach *** to the complicated flow field with flow separation,shock unsteadiness modification inhibited excessive growth of the turbulent kinetic energy in shock regions and wider shock regions are predicted,thereby significantly improving results of the flow with a strong separation *** flow separation was stronger,which was the primary modification effect of the new *** accord with experimental results even in strong separation flows.

关键词：可压缩湍流激震变数 k-ε湍流数学模拟

Location Hierarchical Access Control Scheme based on Attribute Encryption 36

在线全文

学校读者我要写书评

暂无评论

Location Hierarchical Access Control Scheme based on Attribu...

Metabolites change of Scenedesmus obliquus exerted by AgNPs

第36届中国控制会议

作者： Xi Lin yiliang Han Key Laboratory of Network and Information Security of the People's Armed Police Department of Electronic Technology Engineering College of the People's Armed Police

ISBN: (纸本)9781538629185

To solve the problems of location sharing in social network,such as location information management is too loose,access permissions are not clear,it is unable to access the location information hierarchically and soon on,we construct a new algorithm based on attribute encryption and design a location hierarchical access control scheme based on ***,we design a flexible attribute encryption strategy to make different users to obtain their own decryption key corresponding to their permission during system initialization and user ***,encrypt the location information with hierarchical attribute encryption before sharing so that we can provide "precise","more accurate","fuzzy" and "private" four modes to manage *** users’ permissions of decryption is backward compatible,where users with higher permissions can access the location information inferior to their *** our scheme,we encrypt the symmetric key with attribute encryption algorithm and encrypt file data with the symmetric encryption,which ensure a high efficiency ***,we analyze the efficiency and the security of our scheme.

关键词： Location sharing Hierarchical access control Attribute encryption Symmetric encryption

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第2期31卷 310-318页

作者： Pu Wang Bo Zhang Hui Zhang yiliang He Choon Nam Ong Jun Yang School of Environmental Science & Engineering Shanghai Jiaotong University School of Municipal and Environmental Engineering Lanzhou Jiaotong University NUS Environmental Research Institute National University of Singapore

With increasing emission of silver nanoparticles(AgNPs) into the environment, it is important to understand the effects of ambient concentration of AgNPs. The biological effects of AgNPs on Scenedesmus obliquus, a ubiquitous freshwater microalgae, was evaluated. AgNPs exerted a minor inhibitory effect at low doses. Non-targeted metabolomic studies were conducted to understand and analyze the effect of AgNPs on algal cells from a molecular perspective. During the 48 hr of exposure to AgNPs, 30 metabolites were identified, of which nine had significant changes compared to the control group. These include D-galactose, sucrose, and *** carbohydrates are involved in the synthesis and repair of cell walls. Glycine, an important constituent amino acid of glutathione, increased with AgNP exposure concentration increasing, likely to counteract an increased intracellular oxidative stress. These results provide a new understanding of the toxicity effects and mechanism of AgNPs. These metabolites could be useful biomarkers for future research, employed in the early detection of environmental risk from AgNPs.

关键词： Silver nanoparticles (AgNPs) Scenedesmus obliquus Metabolomics Molecular mechanism

DECIDUOUS AND DECIDUOUS-EVERGREEN FORESTS IN NORTHEAST CHINA

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Forestry University 1991年第1期2卷 9-16页

作者： Chou yiliang Liu JianweiNortheast Forestry University 1. Northeast Forestry University China

Two types of forests in Northeast China is divided in this paper, that is, the deciduous forests in the northern part and the deciduous-evergreen forests in the eastern part. Both distributions of the two types of forests have also been presented. Meanwhile, the development and succession as well as components of forests have been studied in detail. In the end, the vertical distribution of the deciduous forests have been shown, in which, the near-temperate cold temperate deciduous coniferous forests are distributing in the low elevation area between 450m-600m from the northto the south, the typical Siberian cold temperate deciduous coniferous forests are widely distributing from 450m-820m in the north to 600m-1050m in the south, the humid cold temperate deciduous coniferous forests can only be found in high elevation area from 820m-l 100m in the north to 1050m-1380m in the south, the cold temperate deciduous coniferous open forests can seldom appear at the top of a few peaks.

关键词： Deciduous forest Deciduous-evergreen forest Succession Distribution Component

Ferruginous Microspherules in Bauxite at Maochang, Guizhou Province, China: Products of Microbe-Pyrite Interaction?

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2006年第4期80卷 604-609页

作者： ZHOU Yuefei WANG Rucheng LU Jianjun LI yiliang State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 China Astrobiology Group Center for Environmental Biotechnology 10515 Research Drive Suite 300 Knoxville TN 37932 USA

The Maochang bauxite in Guizhou Province is one of the important aluminum ore deposits in southwestern China. Ferruginous spherules, measuring about a few microns across, were found in the transitional layer of the deposit. The EDS and XRD results show that the microspherules are composed mostly of iron （hydr）oxide minerals （goethite） with only weak presence of aluminum and silicon. Occasionally, some pyrite micrograins with dissolved surface are found associated with goethite within the spherules. It is thus suggested that microspherules are linked to pyrite oxidization. It is also thought that microbial activities contribute not only to pyrite oxidization, but also to ball-like assemblage of the iron （hydr）oxides. The mechanism of the formation of ferruginous microspherules is also believed to be important in studying geomicrobiology of bauxite.

关键词： bauxite ferruginous microspherules microbe-pyrite interaction Maochang Guizhou

Effects of stable aqueous fullerene nanocrystal (nC_(60)) on Daphnia magna:Evaluation of hop frequency and accumulations under different conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第2期23卷 322-329页

作者： Xianji Yao yiliang He Bo Zhang Yongsheng Chen Joseph B. Hughes School of Environmental Science and Technology Shanghai Jiao Tong University Shanghai 200240 China. School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA College of Fisheries and Life Science Shanghai Ocean University Shanghai 201306 China

We investigated the effects of environmental factors and properties of water-stable crystal fullerene （nC60） on the uptake of nC60 by Daphnia magna based on known accumulation in our laboratory. This study was performed for seven days using different environmental factors including temperature, pH, water hardness, concentration （density of particle）, and particle size. Results demonstrated that body burden of C60 increased with time in all experiments. Body burden of C60 increased with increasing concentration and particle size, and uptake of particles 〉100 nm reached their maximums more quickly than those 〈100 nm. Under high hardness in aqueous systems with lower pH and high temperature, uptake was higher than those under opposite conditions. Uptake in all batch tests reached balance within five days. Both nC60 properties and environmental factors influenced uptake of nC60 by D. magna in an aqueous system. Additionally, environmental factors may have affected accumulation by changing nC60 properties, which are critical to understand the accumulation of fullerenes in aqueous systems.

关键词： C60 fullerene Daphnia magna uptake bioaccumulation

Behavior of aqueous stable colloidal nano-C60 aggregates exposed to TX100 micelles under different environmental conditions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2015年第2期9卷 197-205页

作者： jing HUO Ye YU Ling GE Bo ZHANG yiliang HE School of Environmental Science & Engineering Shanghai Jiaotong University Shanghai 200240 China

C60, as one of carbon nanomaterials widely used in various fields, could be released into the water environment thus exerting some potential health risks to human beings. This work examined the behavior of aqueous stable colloidal nano-C60 （nC60） aggregates under different environmental conditions including Polyethylene glycol octylphenol ether （TX100） micelles concentration, pH, and reaction time when exposed to TX100micelles. Results show that the nC60 aggregates became more dispersive and restored the capability of generating the singlet oxygen when exposed to TX100 micelles. With the increase of TX100 concentration, smaller average size of nC60 aggregates was observed in dynamic light scattering （DLS） analysis, the fluorescence intensity of TX100 was more quenched by nC60 aggregates, and the kinetic rate constant of generating the singlet oxygen for nC60 aggregates was improved. The mean size of nC60 aggregates in the presence of TX 100 had no obvious variations when the pH ranged from 4 to 8. The longer reaction time between nCro aggregates and TX100 led to a higher kinetic rate constant of generating the singlet oxygen. Collective data suggest that variations in physicochemical properties of nC60 aggregates are strongly dependent on the surrounding media under different environmental conditions and directly govern nC60＇S transport behavior and potential toxicity.

关键词： Keywords nano-C60 (nC60) aggregates photochemicalreactivity artificial biological membrane