东营北部凸起带古冲沟储层分布规律研究

在油田勘探与开发中 ,充分认识古冲沟油气藏的勘探与开发是十分重要和有意义的。本文利用东营北部凸起带的地质、钻井、航磁和地震等资料 ,对古冲沟在地震剖面上的特征和古冲沟储层预测方法等进行了研究与探讨     

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基于社会属性的北京城市居民居住环境安全性评价

以北京市城八区和外城五个有代表性的地区为调查研究对象,以2005年的大规模调查问卷为基础数据,运用数理统计和GIS分析手段对北京城市居民自身居住环境安全性的评价做出分析.结果显示,北京市居民对自身居住环境安全性总体较为满意,但不同类型人群对居住环境安全性的评价差别明显,其中高知青年和富裕人群的满意度最高,而贫困老年人群满意度最差.从空间差异来看,内城和城北是安全性评价较好的地区,外城和城南地区评价较差,城市东西方向上的评价值无明显空间差别.     

Low-mass and high-mass supermassive black holes in radio-loud AGNs are spun-up in different evolution paths

How supermassive black holes(SMBHs) are spun-up is a key issue in modern astrophysics. As an extension to the study in Wang et al., here we address the issue by comparing the host galaxy properties of nearby(z 0.05) radio-selected Seyfert 2 galaxies. With the two-dimensional bulge+disk decompositions for the SDSS r-band images, we identify a dichotomy in various host galaxy properties for radio-loud SMBHs. By assuming that radio emission from the jet reflects a high SMBH spin, which stems from the well-known Blandford-Znajek mechanism of jet production, high-mass SMBHs(i.e., MBH 107.9 M⊙)have a preference for being spun-up in classical bulges, and low-mass SMBHs(i.e., MBH = 106-107 M⊙)in pseudo-bulges. This dichotomy suggests and confirms that high-mass and low-mass SMBHs are spun-up in different ways, i.e., a major "dry" merger and a secular evolution respectively.     

The 3D simulation and optimized management model of groundwater systems based on eco-environmental water demand

Through the study of mutual process between groundwater systems and eco-environmental water demand, the eco-environmental water demand is brought into groundwater systems model as the important water consumption item and unification of groundwater’s economic, environmental and ecological functions were taken into account. Based on eco-environmental water demand at Da’an in Jilin province, a three-dimensional simulation and optimized management model of groundwater systems was established. All water balance components of groundwater systems in 1998 and 1999 were simulated with this model and the best optimal exploitation scheme of groundwater systems in 2000 was determined, so that groundwater resource was efficiently utilized and good economic, ecologic and social benefits were obtained.     

Rheological behavior of dredged slurries at high water contents

Each year in the world, there is significant amount of dredged slurries generated during geotechnical jobs. In the slurry storage process, the rheological behavior is a key factor affecting the motion of dredged slurries. To gain better understanding on this behavior, experiments on dredged slurries with different liquid limits are conducted using rotary viscometer. It has been found that, as water content increases, slurry property can change from Bingham plastic fluids to Newtonian fluids. In log–log coordinates, their corresponding yield stress and plastic viscosity are in linear relationship with their water contents and the intersection of these two lines can be treated as the turning point which is 4.7 times the liquid limit. The yield stress and plastic viscosity of different dredged slurries can be normalized efficiently using normalized water content. So, in this paper, a new quantitative prediction method for yield stress and plastic viscosity is proposed, which is effective for use in alkined modes of motion, is proposed.     

Methane hydrate formation comparisons in media with and without a water source supply

Water is a necessary element during gas hydrate formations. Therefore, by analyzing water depletion changes in media, the reaction characteristics of methane hydrate in media can be studied. In this study, two water sources supplying some liquid water which may be consumed by the methane hydrate formation reactions were designed and assembled. Using them, the full formation processes of methane hydrate was studied. Experimental results show the following： If heat released from nucleation reaction of methane hydrate is diffused rapidly, the nucleation ratios will be enhanced discernibly. While the hydrate is formed, a force is generated that sucks fresh water from the source into the vicinity of the hydrate, slowing down the cementation process and causing some hydrate grain dissociation. As a result of cementation differences, the hydrate reaction processes with different water sources present linear or quadratic equation characteristics. After a few repeated dissociation and formation processes of some hydrate grains caused by the fresh water, the gas amounts contained in hydrate will be significantly enhanced.     

Mass-front velocity of dry granular flows influenced by the angle of the slope to the runout plane and particle size gradation

The mass-front velocities of granular flows results from the joint action of particle size gradations and the underlying surfaces.However,because of the complexity of friction during flow movement,details such as the slope-toe impedance effects and momentum-transfer mechanisms have not been completely explained by theoretical analyses,numerical simulations,or field investigations.To study the mass-front velocity of dry granular flows influenced by the angle of the slope to the runout plane and particle size gradations we conducted model experiments that recorded the motion of rapid and long-runout rockslides or avalanches.Flume tests were conducted using slope angles of 25°,35°,45°,and 55° and three particle size gradations.The resulting mass-front motions consisted of three stages:acceleration,velocity maintenance,and deceleration.The existing methods of velocity prediction could not explain the slowing effect of the slope toe or the momentum-transfer steady velocity stage.When the slope angle increased from 25° to 55°,the mass-front velocities dropped significantly to between 44.4% and59.6% of the peak velocities and energy lossesincreased from 69.1% to 83.7% of the initial,respectively.The velocity maintenance stages occurred after the slope-toe and mass-front velocity fluctuations.During this stage,travel distances increased as the angles increased,but the average velocity was greatest at 45°.At a slope angle of 45°,as the median particle size increased,energy loss around the slope toe decreased,the efficiency of momentum transfer increased,and the distance of the velocity maintenance stage increased.We presented an improved average velocity formula for granular flow and a geometrical model of the energy along the flow line.     

文学地理学视野下香港文化认同

通过文本分析和档案分析的方法,立足文学地理学分析框架和研究范式,分析了香港70年代、过渡时期、后殖民时期三部文学界热门且公认具代表性的作品——《我城》《烦恼娃娃的旅程》和《后殖民食物与爱情》,解构了作品中“本土”“国家”和“全球”3个空间维度下再现的地理物象、空间想象、人物活动、地方文化,窥探其内部隐含的文化认同与身份意识问题。结果发现,由于香港社会历史和文化背景不断变迁等原因,香港的文化和身份意识处于不断重塑的状态。通过文本分析,发现香港文学作品中最早萌芽的是“本土”意识。西西的《我城》被认为是本土意识的发轫之作,其在港英政府和回不去的家这一夹缝中在“城”这一空间尺度上勾勒出浓浓的地方意识。其次,在中国恢复行使香港主权这一背景下,《烦恼娃娃的旅程》这一极具回归题材代表性的作品深刻地刻画了香港人在身份认同尺度升级过程中的迷惘。最后,也斯的《后殖民食物与爱情》通过“食物”为线索讲述了回归后的香港故事,为读者认识后殖民时期多元文化混杂下的香港社会提供了细致的观察。通过对三部文学作品的分析,发现港人经历了由殖民统治时期本土身份意识的觉醒以及对中国文化的归属,到回归过渡阶段身份意识的尺度升级及其不适,再到回归后多元文化的交织和协商,不仅在尺度上实现了由地方到国家再到全球化的身份意识塑造,而且在结构上存在中华文化、西方文化和香港本土文化不断协商与冲突的三重性。更为重要的是,通过文学地理视角的讨论,发现这样的文化和身份意识不是属于某个群体的特有特征,而是根植于香港社会的每一寸肌肤,不仅反映了小说作者对香港社会的细致观察,在一定程度上也反映了社会本身所面临的文化和身份困扰。     

A fuzzy distinguishability on species composition similarities of pelagic fishes in different years in the southern Taiwan Strait

I\rnooUcrIoxThe drpdric fish species cor-npositlon is an imPOrtant element 1n the study of fish ecologyand plays an important guiding role ln fishery preduction and roouLrces rnanagement. Lin(l988) and Zhang (1994 and l995) have studied the simi1drities of mpulation COtwsition ofame s1ngle species of different yea-rs including hairtail Trichuras haumee and yellDw cndertwinena cmi. But no rePOrt is available on the discridrination of the sidrildrities amongmuLlt1ple sPecies composition of…