检索结果-南通市图书馆

Geochemical characteristics and origin of reservoir bitumens from Well Zhong 1 in the Katake Uplift,Tarim Basin

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2011年第3期30卷 398-404页

作者： TANG Youjun zan Ling Department of Geochemistry Key Laboratory of Exploration Technologies for Oil and Gas Resources Yangtze University Jingzhou 434023 China Faculty of Natural Resources & Information Technology China University of Petroleum Beijing 102249 China

The source of marine crude oils from Tarim Basin is still ***,research on the reservoir bitumens may provide a piece of new evidence to elucidate oil *** characteristics of reservoir bitumens from different strata from Well Zhong 1 in the Katake Uplift were discussed here in ***/Ph ratios of reservoir bitumen from Well Zhong 1 range from 1.14 to 1.39,CPI ratios from 1.01 to 1.08,which indicates no odd-even predominance of normal alkanes,with OEP ratios ranging from 0.98 to *** contents of gammacerane and C28 sterane of reservoir bitumen from Well Zhong 1 are low,while dibenzothiophene series are ***-ane isomerization maturity parameter and Ts/(Ts+Tm) ratio indicate that the reservoir bitumen from Well Zhong1 is mature to highly *** on the differences in biomarker distribution,it is concluded that reservoir bitumen from Well Zhong 1,of which molecular parameters are contrary to those in Cambrian oil from Well Tadong 2,origi-nated from the Upper Ordovician source rocks.

关键词：地球化学特征塔里木盆地储层沥青隆起起源成熟度参数二苯并噻吩生物标志物

Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in theTarim Basin,Xinjiang,China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2009年第3期28卷 314-319页

作者： TANG Youjun zan Ling Key Laboratory of Exploration Technologies for Oil and Gas Resources Department of Geochemistry Yangtze University Jingzhou 434023 China Faculty of Natural Resources ＆ Information Technology China University of Petroleum Beijing 102249 China

Research on the molecular fossil characteristics of heavy oil from Well Tadong-2 is of great importance to constrain the source of marine crude oils in the Tarim Basin, Xinjiang, China. The authors synthetically applied the isotope mass spectrograph, chromatography and chromatography-mass spectrography to the studies of molecular fossil characteristics of heavy oil from Well Tadong-2 in the Tarim Basin, and the results obtained revealed that heavy oil from Well Tadong-2 is characterized by high gammacerane, high C28 sterane, low rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to those of Cambrian-Lower Ordovician source rocks, demonstrating that Cambrian crude oils came from Cambrian-Lower Ordovician source rocks; condensed compounds (fluoranthene, pyrene, benzo[a]anthracene, bow, benzo fluoranthene, benzopyrene) of high abundance were detected in heavy oil from Well Tadong-2, and the carbon isotopic values of whole oil are evidently heavy, all the above characteristics revealed that hydrocarbons in the crude oils became densified in response to thermal alteration.

关键词：分子化石重油井塔新疆中国 m盆地同位素质谱仪塔里木盆地

An ultrahigh-sensitivity and selective sensing material for ethanol： α-/γ-Fe2O3 mixed-phase mesoporous nanofibers

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第11期8卷 3673-3686页

作者： Shuang Yan Guangtao zan Qingsheng Wu Department of Chemistry Key Laboratory of Tobacco Industry Ogarette Smoke (Shanghai Tobacco Group Co. Ltd.) Tongji University Shanghai 200092 China School of Materials Science and Engineering Tongji University Shanghai 200092 China

A process for synthesizing Fe2O3 based on electrospinning and the hard-template method was proposed such that the crystal phase of Fe2O3 could be tailored with precision. Mesoporous γ-Fe2O3, α-/γ-Fe2O3, and α-Fe2O3 nanofibers could be fabricated successfully by changing the synthesis parameters. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction analyses, Raman spectroscopy, and nitrogen adsorption-desorption analyses were used to characterize the structures of the synthesized products. The optimal calcination conditions for preparing α-/γ-FeaO3 nanofibers with the highest ethanol response were determined through ethanol-sensing measurements. The mixed-phase material exhibited a significantly higher sensitivity than the corresponding purephase ones. The superior ethanol-sensing performance of the α-/γ-Fe2O3 nanofibers suggested that they may be suitable for use in alcohol sensing. Hence, a novel strategy for improving the sensing performance of metal oxide semiconductors is to assemble the different crystalline forms of the same metal oxide in one structure. Finally, the mechanism responsible for the sensing performance of α-/γ-Fe2O3 being higher than those of γ-Fe2O3 and α-Fe2O3 was elucidated on the basis of data from X-ray photoelectron spectroscopy and resistance measurements.

关键词： sensitivity enhancement mixed-phase structure oxygen vacancies one-dimensional Fe2O3 ethanol sensing

Effects of water,fertilizer,dissolved oxygen and temperature coupling on the photosynthesis,quality and yield of lettuce

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

International Journal of Agricultural and Biological Engineering 2023年第5期16卷 132-141页

作者： zan Ouyang Juncang Tian College of Water Resources and Civil Engineering Hunan Agricultural UniversityChangsha 410128China School of Civil and Hydraulic Engineering Ningxia UniversityYinchuan 750021China Engineering and Technology Research Center of Water-Saving Irrigation and Water Resource Regulation in Ningxia Ningxia UniversityYinchuan 750021China Engineering Research Center for Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions Ministry of EducationYinchuan 750021China

With the increased demand for vegetables of nutritional value,enhancing vegetable quality while pursuing high yield has become a goal of many *** the present study,the effects of irrigation quota(A),fertilizer amount(B),dissolved oxygen(DO,C),and temperature in the climate chamber(D)applied in combination with the quality and yield of lettuce were ***-factor and three-level orthogonal designs were used to determine the single-factor trend,the sequence of primary and secondary influencing factors,and optimal regulatory measures concerning the *** order of the primary and secondary effects on the plant height,net photosynthesis rate(P_(n)),transpiration rate(E),vitamin C content(V_(c)),soluble protein content(S_(p)),dry matter accumulation(Dm),yield,irrigation water use efficiency(IWUE)of the lettuce plants followed the order A>B>D>*** addition,the order of the primary and secondary effects on the intercellular carbon dioxide concentration(C_(i)),chlorophyll content,and nitrate content followed the order A>D>B>*** optimum scheme for lettuce was A3B2C1D3(irrigation quota of 69 mm;fertilizer amount of 1.30 g/pot;DO of 6.5 mg/L;and temperature in the climate chamber of 20℃).Under the coordinated regulation of water,fertilizer,air,and temperature,the quality and yield of lettuce have been significantly *** study had important reference significance for the comprehensive regulation of water,fertilizer,air,and temperature facilities for vegetables.

关键词： Aerated irrigation Increased-temperature irrigation Growth Photosynthesis Dry matter accumulation Principal component analysis

Electrical and Optical Characteristics of Electrodeless Lamp

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

高压电器 2011年第9期47卷 12-18页

作者： WANG Chang-quan ZHANG gui-xin DONG Jin-yang SHAO Ming-song WANG Xin-xin WANG zan-ji Department of Electrical Engineering Tsinghua University Beijing 100084 China

In order to study the methods to enhance the efficacy of electrodeless lamp,volt-ampere characteristics,illuminance and emission spectrum have been investigated in home-built electrodeless lamp experimental system with an electrodeless lamp in shape like QL 85 *** results show that lamp current increases as lamp voltage increases in non-discharge,the current decreases first and then increases as the voltage increases in *** illuminance of electrodeless lamp increases linearly with discharge power increasing,and it decreases linearly with power *** emission spectrum is different for different bulb and lighting *** spectrum of Ar 811.5 nm,76.5 nm,750.4 nm and Hg 313.2 nm decrease with lighting *** the intensity of Hg 407.8 nm increases with lighting time.

关键词： electrodeless lamp volt-ampere characteristics illuminance emission spectrum efficacy

Numerical simulation of solitary wave propagation based on MPS method

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2007年第3期26卷 121-128页

作者： LI Shaowu YU Zhi＇ an XIONG zan Department of Port and Coastal Engineering Tianjin University Tianjin 300072 China

The concept of candidate particle set is introduced in the MPS gridless numerical method to generate neighboring particle set ma- trix, which can reduce the CPU time to 1/11 of that before introduction. The Bi-CGSTAB （bi-conjugate gradient stabilized） algorithm is applied to solving the Poisson pressure equation, by which the solving speed is significantly accelerated. The process of solitary waves propagating over a numerical flume and interacting with a vertical wall is simulated. The simulated results of water surface elevation are in good agreement with the analytical solution as well as the measured data. The predicted maximum values of the run-up of solitary waves with various relative incident wave heights agree well with the measured results.

关键词： MPS method candidate particle set Bi-CGSTAB algorithm solitary wave

Fight fire with fire?Promoting physical activity and health through active video games

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2017年第1期6卷 1-3,127页

作者： zan Gao School of Kinesiology The University of MinnesotaMinneapolisMN 55455USA.

Physical inactivity has been identified as one of the leading causes of many chronic diseases such as cardiovascular disease,type 2 diabetes,and *** such as video games plays a complicated role in physical inactivity... 详细信息

关键词： AVG PA Promoting physical activity and health through active video games Fight fire with fire

NLO QCD corrections to Bc(B＊c) production around the Z pole at an e＋e- collider

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2018年第3期61卷 34-46页

作者： XuChang Zheng ChaoHsi Chang TaiFu Feng zan Pan Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences bering 100049 China China Center of Advanced Science and Technology (World Laboratory) Beijing 100190 China Department of Physics Hebei University Baoding 071002 China

The production of Bc and B＊ mesons at a Z-factory （an e＋e- collider operating at energies around the Z pole） is calculated up to the next-to-leading order （NLO） QCD accuracy. The results show that the dependence of the total cross sections on the renormalization scale/1 is suppressed by the corrections, and the NLO corrections enhance the total cross sections of B,. by 52% and of Bc＊ by 33% when the renormalization scale is taken at μ = 2mb. To observe the various behaviors of the production of the mesons Bc and Bc＊, such as the differential cross section vs. the out-going angle, the forward-backward asymmetry, and the distribution vs. the energy fraction z up to NLO QCD accuracy as well as the relevant K-factor （NLO to LO） for the production, are calculated, and it is pointed out that some of the observables obtained in the present work may be used as a specific precision test of the standard model.

关键词： Bc meson production Z-factory

Generation and characterization of orthogonal FH sequences for the cognitive network

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第2期58卷 140-150页

作者： GUAN Lei LI zan SI JiangBo HUANG YangChao State Key Laboratory of Integrated Services Networks Xidian University

The existing orthogonal frequency hopping(FH) sequence cannot support the high throughput and high spectrum efficient cognitive FH(CFH) network due to its small family size, high computational complexity and short period. To overcome these disadvantages, this paper investigates the generation of the orthogonal FH sequence and analyzes its multiple accessibility performance based on the CFH frequency division multipleaccess(FDMA) network model. By the random mapping and cyclical shift replacement(CSR) scheme, a large family size of orthogonal FH sequence with dynamic frequency slot number is generated. In this case, the external interference could be eliminated by avoiding the interfered frequencies, and blocking mutual interference incurred for the packet by the orthogonal frequencies. Moreover, the theoretical relationships of the throughput and transmission delay with respect to the user number and the packet arrival rate are given, which shows that our proposed orthogonal FH sequence could support high throughput and short packet transmission delay in CFH-FDMA network. The simulation results validate our theoretical analysis of the CFH-FDMA network performance, and show that our proposed sequence outperforms the widely used no hit zone FH sequences in terms of uniformity, randomness, Hamming correlation, complexity and sensitivity, etc.

关键词： cognitive frequency hopping orthogonal frequency hopping sequence frequency hopping network frequency division multiple access throughput