检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

东辛油田东南部油藏描述及滚动勘探目标选择

石油学报 2004年第2期25卷 36-40页

作者：张煜陈恭洋史文东张永贵中石化胜利油田公司山东东营257094 长江大学地球科学学院湖北荆州434023 中石化勘探开发研究院北京100083

通过高分辨率层序地层划分与对比、全三维地震资料构造解释与微构造分析、测井地震约束波阻抗反演、地震资料油气预测等配套新技术的综合应用 ,重新建立了东辛油田东南部地区的油藏地质模型。在对成藏规律认识的基础上 ,提出了工区构... 详细信息

通过高分辨率层序地层划分与对比、全三维地震资料构造解释与微构造分析、测井地震约束波阻抗反演、地震资料油气预测等配套新技术的综合应用 ,重新建立了东辛油田东南部地区的油藏地质模型。在对成藏规律认识的基础上 ,提出了工区构造油藏和岩性油藏两类共 7个滚动勘探目标。前者主要为沙三中以下目的层 ;后者为微构造或斜坡背景下的岩性尖灭型圈闭。

关键词：油藏描述滚动勘探目标选择东辛油田

Asymptotic Behavior of Slender Flying Vehicle with a Finite Controller

在线全文

学校读者我要写书评

暂无评论

Systems Science and Systems Engineering 1996年第2期6卷 246-249页

作者： LI Shengjia(Department of Mathematics, Shanxi university, Taiyuan, china, 030006)YU Jiangyuan(Istitute of information and Control,{2. , china, 100037)

In this paper, it is proved that there exists a finite controller such that the aymptoticbehavior of a slender space vehicle with the effect of aerodynamic power exponentially stablizes to atable state.

关键词： beam equation finite control exponential stability.

Characteristics of mechanical alloyed Ni-Al powder for sintering

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2007年第4期26卷 372-376页

作者： MENG Jie JIA Chengchang HE Qing Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

Mechanical alloying was employed to obtain high-activity Ni-AI powder. The effects of mechanical alloying on the microstructure and characteristics of milled powder with a normal composition of Ni-2..89 at.% AI-0.5 at.% B were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The results show that a solution Ni （AI） was obtained after milling. During mechanical alloying, the milled powder obtains extra surface energy and crystalline energy because the crystallite size becomes free and the lattice strain increases with the milling time prolonging. Furthermore, about 0.5 mol% oxide in the particles were formed after milling, and this kind of dis- persed oxide is effective to improve the properties of the sintered alloy by dispersion strengthening. It is confirmed that Ni3AI alloy with outstanding properties has been prepared with mechanical alloyed powders.

关键词： intermetallics mechanical alloying X-ray diffraction powder metallurgy

Accelerating column leaching trial on copper sulfide ore

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第1期27卷 95-100页

作者： WANG Hongjiang WU Aixiang ZHOU Xun WANG Shaoyong ZHANG Jie Civil and Environment Engineering School University of Science and Technology Beifing Beifing 100083 China School of Resource and Safety Engineering Central South University Changsha 410083 China

The main measures to accelerate leaching sulfide ore are large spraying intensity,manual oxygen supply,temperature control,and acclimated *** indoor experiment accelerating sulfide ore leaching detected the temperature during leaching process,dissolvability of oxygen,bacterial concentration,Cu concentration and slag *** the same time,this paper also analyzed the effect of four factors,which are bacterial diversity cultivation stage,spraying intensity,air supply,and whether to control temperature,on the leaching efficiency of *** results indicate that the oxygen content of leach solution has a close relationship with temperature but it is rarely affected by air *** bacterial concentration preserves from 106 to 107 mL^-1,and temperature has a great effect on the bacterial activity under the condition of proper temperature and oxygen supply,and the lack of nutrition prevents the bacterial concentration from rising in the late *** relationships of the copper leaching efficiency to temperature,air feed,and spraying intensity are directly *** leaching efficiencies of the cultivated bacteria and acclimation bacteria are 1.2.and 1.4 times as large as that of the original bacteria.

关键词： accelerating leaching spraying intensity manual air supply temperature control bacterial cultivation

A LAI Inversion Algorithm Based on Directional Reflectance

在线全文

学校读者我要写书评

暂无评论

A LAI Inversion Algorithm Based on Directional Reflectance

Synthesis, Growing Processes and Physical Properties of CdS Nanoclusters in Y-Zeolite Studied by Positron Annihilation

中国气象学会2.04年年会

作者： Tang Shihao~(12. (1 National Satellite Meteorological Center, china Meteorological Administration,{2. 100081, china 2.Remote Sensing and GIS Research Center, Department of Geography,{2. Normal university,{2. 100875, china)

＜正＞Leaf area index (LAD is an important ecological and environmental parameter. The current remote sensing inversion methods of leaf area index can mainly（?）e grouped into two classes: vegetation index based methods and remote sensing physical model based methods. In this paper, a new LAI retrieval method is developed. The algorithm borrows ideas from the principles and methods of ground LAI measurements, and adopts a new frame which differs from traditional remote sensing LAI inversion methods. First, the relationship between LAI and directional gap fraction is derived from the definition of LAI. Then, directional gap fraction is acquired from remote sensing bidirectional reflectance distribution function （BRDF） product. This acquisition is obtained by the use of a kernel driven model and a large scale directional gap fraction algorithm. At last, the large scale LAI is calculated through angle integrations. This algorithm has been applied to get LAI distribution of china in the middle of July, 2.02. The ground data acquired from two field experiments conducted in Changbai Mountain and Qiiian Mountain, china, are used to validate the algorithm. In order to resolve the scale change problem between high resolution grouad observation and low resolution remote sensing data, two high resolution remote sensing images almost ha, ing the same resolutions with ground measurements are used as transitions. In order to proceed, we first bulid an empirical relationship between measured LAI and high resolution reflectance. Then, we get high resolu ion LAI distribution according to that relation. The LAI value of a low resolution pixel is calculated from the areal weighted sum of high resolution LAIs composing the low resolution pixel. Our results show that the algo（?）ithm has a high precision. Factors that may influence the precision of the algorithm are also discussed in this paper.

关键词： LAI MODIS BRDF ALBEDO Gap fraction

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

Wuhan university Journal of Natural Sciences 2000年第4期5卷 431-435页

作者： Peng Hao,Ma Li, Wang Shao-jie, Liu Shu-man, Lin Zhao- jun Department of Physics, Wuhan university, Wuhan 430072. china Institute of Semiconductor, Chinese Academy of Science,{2. 100086, china Wuhan university Department of Physics Wuhan China (GRID:grid.49470.3e) (ISNI:***) Chinese Academy of Science Institute of Semiconductor Beijing China (GRID:grid.9227.e) (ISNI:***)

Direct synthesis of CdS nanoclusters within the pore structure of Y zeolite was made. The location of CdS nanoclusters inside Y zeolite hosts was confirmed by the blue-shifted reflection absorption spectra with respected to that of bulk CdS materials. In this paper, we conducted Positron Annihilation Lifetime Spectrum (PALS) measurements on a series of CdS/Y zeolite samples and concluded that CdS clusters were not located in supercages but in smaller sodalite cages; as the CdS loading concentration increases to 5 wt%, the discrete CdS cubes begin to form bigger superclusters through interaction. The stability of CdS clusters inside the sodalite units is due to the coordination of Cd atoms with the framework oxygen atoms of the double six-ring windows. Moreover, PALS reveals some important information of surface states existing on the interfacial layers between CdS clusters and Y zeolite.

关键词： Y zeolite nanoclusters absorption spectrum positron annihilation surface states interfacial layers

Crystalline Silicotitanate: a New Type of Ion Exchanger for Cs Removal from Liquid Waste

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2002年第3期18卷 206-210页

作者： Bo YU, Jing CHEN and Chongli SONGInstitute of Nuclear Energy Technology, Tsinghua university, beijing 102.01,{2. [ Manuscript received January 18, 2.01, in revised form April 13, 2.01] Tsing Hua Univ Inst Nucl Energy Technol Beijing 102201 Peoples R China

The research and developments of a new type of inorganic ion exchanger, crystalline silicotitanate (CST) are reviewed. This material is stable against radiation, and the CST has high selectivity for Cs over Na, K and Rb. It performs well in acidic, neutral, and basic solutions. The results of ion exchange tests show that CST is an excellent candidate for Cs removal from high-level liquid waste.

关键词： Crystalline silicotitanate Cesium High-level liquid waste

Semigroup Method for a Mathematical Model in Reliability Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2001年第2期13卷 137-147页

作者： Geni Gupur 1,3 , LI Xue-zhi 2.3 1.Department of Mathematics, Xinjiang university, Urumqi 830046,china2. Department of Mathematics, Xinyang Teachers College, Henan 464000,{2.3. Academy of Mathematics and System Sciences, Chinese Academy of Sci Department of Mathematics Xinjiang University Urumqi 830046 China Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Department of Mathematics Xinyang Teachers College Henan 464000 China Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

The system which consists of a reliable machine, an unreliable machine and a storage buffer with infinite many workpieces has been studied. The existence of a unique positive time-dependent solution of the model corre... 详细信息

关键词： steady-state solution time-dependent solution C 0-semigroup dispersive operator

Derivation of Bald Earth Digital Elevation Models with X Band Airborne InSAR

在线全文

学校读者我要写书评

暂无评论

Derivation of Bald Earth Digital Elevation Models with X Ban...