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Characteristics,genesis and accumulation history of natural gas in Hetianhe gasfield,Tarim Basin,china

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Science china Earth {1. 2008年第S1期51卷 84-95页

作者： WANG zhaoMing 1.,WANG QingHua 1.,zhao MengJun 2.,li Yong 1.&XU ZhiMing 3 1.Tarim Oilfield Company,Petrochina,Kuerle 841.00,china 2.Research institute of Petroleum Exploration&Development,Petrochina,{12. 1.0083,china 3 Southwest Petroleum institute,Nanchong 637001.china Petrochina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China Petrochina Tarim Oilfield Co Kuerle 841000 Peoples R China SW Petr Inst Nanchong 637001 Peoples R China

Hetianhe gasfield in Bachu region of the Tarim Basin is mainly composed of three reservoir-caprock assembly,namely regional caprock of upper mudstone,middle mudstone and lower mudstone of the Carboniferous and reservoir of Bachu bioclastic limestone,glutenite and the Ordovician carbonate buried *** gas in Hetianhe gasfield sourced from the Cambrian source *** is thought that gases in Ma4 well block in the east of Hetianhe gasfield are mainly crude-oil cracked gases,while those in Ma3 and Ma8 well blocks in the west are the mixture gases of kerogen cracked gases and crude-oil cracked *** gas is rich in H2. and accumulated in multiply stages as the result of *** accumulation history is divided into three stages,namely accumulation and breakage in the late Caledonian-early Hercynian,migration and dissipation in the late Hercynian and accumulation in Himalayan. The main accumulation of reformed gas reservoir is in Himalayan.

关键词： gas characteristics gas genesis accumulation history Hetianhe gasfield Tarim Basin

RHEOLOGICAL MODIFICATION OF EPOXY RESINS WITH NANO SIliCA PREPARED BY THE SOL-GEL PROCESS

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chinese Journal of Polymer Science 1999年第3期17卷 253-257页

作者： Xia Wang Jiang li Cheng-fen Long Yun-{1. Yu PCLCC {2. of Chemistry, chinese Academy of sciences, beijing 100080, china PCLCC is the Polymer Chemistry Laboratory, chinese Academy of sciences and china Petro-Chemica Corporation chinese Acad Sci Inst Chem PCLCC Beijing 100080 Peoples R China

Nano silica-modified epoxy resins were synthesized by the sol-gel process, The materials have the morphological structure of nano particales dispersed in the epoxy matrix. The dispersed phase formed a physical network in the resin and thus influenced the rheological behavior greatly. However, the nano silica did not show a significant influence on the mechanical properties of the cured resins.

关键词： epoxy resin nano silica mechanical properties rheology sol-gel process

Fog Detection over china's Adjacent Sea Area by using the MTSAT Geostationary Satel{1.te Data

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Atmospheric and Oceanic Science Letters 2012年第2期5卷 128-133页

作者： li Jun 1.2.HAN Zhi-Gang 3,CHEN Hong-Bin 1.{1. Zeng-liang 3,and WU Hong-Yi 4 1.Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO),institute of Atmospheric Physics,chinese Academy of sciences,beijing 1.002.,china 2.Graduate University of chinese Academy of sciences,beijing 1.0049,china 3 beijing institute of Applied Meteorology,beijing 1.002.,china 4 beijing Meteorological Bureau,beijing 1.0089,china [a] Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China[b] Graduate University of Chinese Academy of Sciences Beijing 100049 China[c] Beijing Institute of Applied Meteorology Beijing 100029 China[d] Beijing Meteorological Bureau Beijing 100089 China

A fog threshold method for the detection of sea fog from Multi-function Transport Satellite (MTSAT1.) infrared (IR) channel data is *** method uses principle component analysis (PCA),texture analysis,and threshold detection to extract sea fog information.A heavy sea fog episode that occurred over {1.'s adjacent sea area during 7 8 April 2.08 was detected,indicating that the fog threshold method can effectively detect sea fog areas nearly 2. hours a ***-1. data from March 2.06,June 2.07,and April 2.08 were processed using the fog threshold method,and sea fog coverage information was compared with the meteorological observation report data from *** hit rate,miss rate,and false alarm rate of sea fog detection were 66.1.,2..3%,and 33.9%,*** results show that the fog threshold method can detect the formation,evolution,and dissipation of sea fog events over period of time and that the method has superior temporal and spatial resolution relative to conventional ship *** addition,through MTSAT-1. data processing and a statistical analysis of sea fog coverage information for the period from 2.06 to 2.09,the monthly mean sea fog day frequency,spatial distribution and seasonal variation characteristics of sea fog over {1.'s adjacent sea area were obtained.

关键词： sea fog MTSAT geostationary satellite spatial distribution seasonal variation

Security and Privacy in Solar Insecticidal Lamps Internet of Things:Requirements and Challenges

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 58-73页

作者： Qingsong zhao Lei Shu Kai{1.ang {1. Mohamed Amine Ferrag Ximeng {1.u Yanbin {1. the College of Artificial Intelligence Nanjing Agricultural UniversityNanjing 210031 the State Key Laboratory for Novel software Technology Nanjing UniversityNanjing 210023 the State Key Laboratory of Cryptology Beijing 100878China IEEE the School of Engineering University of LincolnLincoln LN67TSUK the Artificial Intelligence and Digital Science Research Center Technology Innovation InstituteMasdar City 9639UAE the College of Computer and Data Science Fuzhou UniversityFuzhou 350108China

Solar insecticidal lamps(SIL) can effectively control pests and reduce the use of pesticides. Combining SIL and Internet of Things(IoT) has formed a new type of agricultural IoT,known as SIL-IoT, which can improve the effectiveness of migratory phototropic pest control. However, since the SIL is connected to the Internet, it is vulnerable to various security *** issues can lead to serious consequences, such as tampering with the parameters of SIL, illegally starting and stopping SIL,etc. In this paper, we describe the overall security requirements of SIL-IoT and present an extensive survey of security and privacy solutions for SIL-IoT. We investigate the background and logical architecture of SIL-IoT, discuss SIL-IoT security scenarios, and analyze potential attacks. Starting from the security requirements of SIL-IoT we divide them into six categories, namely privacy, authentication, confidentiality, access control, availability,and integrity. Next, we describe the SIL-IoT privacy and security solutions, as well as the blockchain-based solutions. Based on the current survey, we finally discuss the challenges and future research directions of SIL-IoT.

关键词： Challenges Internet of Things(IoT) privacy and security security requirements solar insecticidal lamps(SIL)

Advanced System-Level Model Reduction Method for Multi-Converter DC Power Systems

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1550-1562页

作者： lin Zhu Xueshen {1. Xialin li li Guo Bo {1. Zhanfeng Deng Hao Lu Chengshan Wang the Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China the Research institute of State Grid Zhejiang Electric Power Co. Ltd.Hangzhou 310014China the State Grid Global Energy Interconnection Research institute Beijing 102209China

For dynamic stability analysis and instability mechanism understanding of multi-converter medium voltage DC power systems with droop-based double-loop control,an advanced system-level model reduction method is *** this method,mathematical relationships of control parameters(e.g.,current and voltage control parameters)between the system and its equivalent reduced-order model are ***,open-loop and closed-loop equivalent reduced-order models of current control loop considering dynamic interaction among converters are *** instability mechanism(e.g.,unreasonable current control parameters)of the system can be revealed *** guidance for adjustment of current control parameters can also be ***,considering dynamic interaction of current control among converters,open-loop and closed-loop equivalent reduced-order models of voltage control loop are *** frequency and damping factor of DC bus voltage in a wide oscillation frequency range(e.g.,1.–50 Hz)can be evaluated *** importantly,accuracy of advanced system-level model reduction method is not compromised,even for MVDC power systems with inconsistent control parameters and different number of ***,experiments in RT-BOX hardware-in-the-loop experimental platform are conducted to validate the advanced system-level model reduction method.

关键词： Closed-loop reduced-order model instability mechanism open-loop reduced-order model stability analysis system-level model reduction method

All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

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The Journal of china Universities of Posts and Telecommunications 2024年第2期31卷 44-54页

作者： li Kun {1. Xu Wang Meng Jia Xingning {1. Ruiqi Lu Guizhen School of Integrated Circuit Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Electronic and Electrical Engineering Ningxia UniversityYinchuan 750021China QILU Aerospace Information Research institute Chinese Academy of Sciences(CAS)Jinan 250101China State Key Laboratory of Media Convergence and Communication Communication University of ChinaBeijing 100024China

The method of terahertz(THz)resonance with a high-quality(high-Q)factor offers a vital physical mechanism for metasurface sensors and other high-Q factor ***,it is challenging to excite the resonance with a high-Q factor in metasurfaces with proper sensitivity as well as figure of merit(FOM)***,an all-dielectric metasurface composed of two asymmetrical rectangular blocks is *** and silicon are the materials applied for the substrate and cuboids *** distinct resonance governed by bound states in the continuum(BIC)is excited by forming an asymmetric cluster by a novel hybrid method of cutting and moving the *** investigation focuses on analyzing the transmission spectra of the metasurface under different variations in structural parameters and the loss of silicon refractive *** the proposed defective metasurface serves as a transmittance sensor,it shows a Q factor of 1.08×1.^(4)and achieves an FOM up to 4.8×1.^(6),which is obtained under the asymmetric parameter equalling 1.***,the proposed defective metasurface is sensitive to small changes in refractive *** the thickness of the analyte is 1.0μm,the sensitivity reaches a maximum value of 578 GHz/***,the proposed defective metasurface exhibits an extensive number of possible applications in the filters,biomedical diagnosis,security screening,and so on.

关键词： terahertz(THz)metasurface high-quality(high-Q)factor bound states in the continuum figure of merit(FOM)

Texture Evolution of 440 MPa Grade Nb-bearing High Strength IF Steel during Rolling and Annealing Process

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1157-1161页

作者：陈银莉 Engineering Research institute University of Science and Technology Beijing

The texture evolution from rolling process to annealing process of 440 MPa grade Nb-bearing high strength IF steel （IF-HSS） was studied. Moreover, the texture of different section in thickness direction of steel sheet after annealing was investigated. Macro-texture measurements using XRD shows that hot rolling texture in Nb-bearing IF-HSS includes a weak γ-fiber and α-fiber, of which main texture components are {001}〈110〉,{111}〈110〉 and {111}〈112.. It is worthy of note that the γ-fiber skeleton line formed after hot rolling. During cold rolling, the absolute maximum shifts to {111}〈112. along the γ-fiber and the maximum along the α-fiber shifts to {112. 〈110〉. During recrystallization annealing process, the weaker α-fiber and stronger γ-fiber cold rolling texture transformed to a very strong γ-fiber annealing texture. After annealing the main components from surface to mid-section along thickness display the same character for both α-fiber and γ-fiber, while textures intensity at 1/4 section is higher than that of surface and mid-section.

关键词： textures recrystallization high strength IF steel

TRANSIENT EFFECT OF A BOGER FLUID FLOWING AROUND A CONFINED CYliNDER

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chinese Journal of Polymer Science 2001年第4期19卷 377-384页

作者： Xian-feng li Huai-tian Bu De-lu {1. State Key Laboratory of Polymer Physics and Chemistry Center for Molecular Science,{2. of Chemistry, chinese Academy of sciences, beijing 100080, china chinese Acad Sci Inst Chem Ctr Mol Sci State Key Lab Polymer Phys & Chem Beijing 100080 Peoples R China

This paper is concerned with the numerical simulation of the transient effect of an inertialess Boger flow past a confined circular cylinder and the comparison of predictions with particle image velocimetry (PIV) measurements given by Shiang et al.. Dynamic simulation based on the Oldroyd-B constitutive model was carried out using a Lagrangian-Eulerian algorithm. The evolution of velocity field was obtained for the flow at two Deborah (De) numbers, i.e. De = 1.2.and 3.0. At low De, the flow reached steady state rapidly, and showed a symmetric flow regime. However, at high De, the time required to reach steady flow behind the cylinder increased significantly, and the distribution of the velocity field appears to be asymmetric with respect to the stagnation line. Fairly good agreement between the numerical results and the experimental observations is reported. It can be concluded that both the experimental measurements and the present simulations indicate that the elasticity of the polymeric flow strongly affect the flow regime of viscoelastic flow around a confined cylinder.

关键词： transient effect flow around a cylinder Lagrangian-Eulerian algorithm Oldroyd-B model

The competition between Bidens pilosa and Setaria viridis alters soil microbial composition and soil ecological function

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Journal of Integrative Agriculture 2024年第1期23卷 267-282页

作者： Qiao li Jianying Guo Han Zhang Mengxin {1. State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China College of life Science Yangtze UniversityJingzhou 434025China

Bidens pilosa is recognized as one of the major invasive plants in *** invasion has been associated with significant losses in agriculture,forestry,husbandry,and *** ecosystems play an important role in alien plant *** within the soil act as intermediaries between plants and soil ecological functions,playing a role in regulating soil enzyme activities and nutrient *** the interactions between invasive plants,soil microorganisms,and soil ecological processes is vital for managing and mitigating the impacts of invasive species on the *** this study,we conducted a systematic analysis focusing on *** and Setaria viridis,a common native companion plant in the invaded *** simulate the invasion process of ***,we constructed homogeneous plots consisting of *** and *** grown separately as monocultures,as well as in *** rhizosphere and bulk soils were collected from the alien plant *** and the native plant *** order to focus on the soil ecological functional mechanisms that contribute to the successful invasion of ***,we analyzed the effects of *** on the composition of soil microbial communities and soil ecological *** results showed that the biomass of *** increased by 2..5{2. and that of *** was significantly reduced by 66.56%.The organic matter contents in the bulk and rhizosphere soils of *** were approximately {2.30 times those in the native plant *** TN and NO_(3)^(-)contents in the rhizosphere soil of *** were {2.30 to 2.7{2.times those in the native plant *** activities of acid phosphatase,alkaline phosphatase,and urease in the rhizosphere soil of *** were {2.98-2.2. times higher than in the native plant *** high-throughput sequencing of the{2.S rRNA gene,we found that *** altered the composition of the soil microbial ***,many genera in Actinobacteria and Proteobacteri

关键词： plant invasion Bidens pilosa soil microbial composition soil properties soil enzyme activities