天然气化工现状及技术进展

介绍了国内外天然气化工的现状,综述了天然气制烯烃、天然气制含氧化合物、天然气制合成油及芳烃的新进展,并对我国天然气化工发展提出建议。     

我国天然气化工的发展现状及建议

近年来,我国天然气探明储量不断增加,海上气田的勘探和开发也有较大进展,但天然气对外依存度仍不断升高,中国已成为重要的天然气进口国,天然气工业在改善我国能源结构、大力推动低碳经济发展过程中获得了前所未有的大发展。促进天然气化工的发展建议是:天然气的输送和储存问题;促进非常规天然气产业发展;合理开发天然气中硫资源的化工利用;致力研究甲烷的直接转化;积极推进天然气制合成油工艺;加快发展现有天然气化工产业。中国天然气化工处在快速发展阶段,面临着重要的战略机遇,假以时日必将展现出广阔的发展前景。     

长江上游地区的天然气工业与发展战略

本文阐述了四川天然气工业的发展,现状和发展趋势,在考察了四川天然气化工和盐化工的基础上,提出了建立以重庆为核心的川东、川中系统化工群的初步设想,并指出了四川天然气化工和盐化工产品要向系列化,精细化方向发展。     

尿素合成塔放射源容器检修维护注意事项

青海盐湖股份综合利用二期是以氯化钠和天然气为原料生产聚氯乙烯、氢氧化钠、合成氨和尿素的大型联合化工工厂。30万t/年合成氨,33万t/年尿素装置地处青藏高原柴达木盆地察尔汗盐湖,放射性仪表用于青海盐湖股份综合利用二期工程尿素装置高压合成塔,该装置由中国成达工程公司设计。     

青海化肥工业的现状及发展趋势

介绍了青海化肥工业的发展概况及现状，结合国内外化肥工业的发展趋势，分析青海化肥工业发展的有利因素及制约因素，提出了青海化肥工业的发展方向及应采取的措施。     

浅谈天然气化工技术进展及其分析

本文通过叙述天然气化工技术的现状,说明了化工技术的进展,并阐明发展过程中遇到的问题以及解决这些问题提出了合理的建议.     

抓住机遇，积极发展现代天然气化工

我国天然气化工发展至今已有30余年,已有一定的基础,目前的四川、重庆、黑龙江、陕西、甘肃等10几个省（市、自治区）已建有天然气化工产业,共有约150余套装置,1998年我国天然气消费为205亿立方米,用于工业的占87.4%;其中化工用气为89亿立方米,占消费总量的43.5%。     

抓住机遇,积极发展现代天然气化工

 我国天然气化工发展至今已有３０余年 ,已有一定的基础。目前在四川、重庆、黑龙江、陕西、甘肃等１０几个省（市、自治区）已建有天然气化工产业 ,共有约１５０余套装置。１９９８年我国天然气消费为２０５亿立方米 ,用于工业的占８７．４ % ;其中化工用气为８９亿立方米 ,占消费总量的４３．５ %。我国天然气化工产品的重点产地多集中在川、渝地区 ,约生产７０多个品种。我国目前的天然气化工装置中 ,除１５个大型合成氨装置外 ,其余大部分均为规模小、技术水平低的单个装置 ,缺乏综合利用和深加工能力 ,缺乏竞争力。     

青海木里多年冻土区天然气水合物调查研究进展综述

综述了青海木里多年冻土区天然气水合物的调查研究进展,重点评述了木里天然气水合物形成的地质特征及其资源潜力,并从理论研究和开发应用方面进行展望。     

榆林市能源化工产业链分析

根据榆林市能源化工产业建设现状,对榆林市主要能源化工产业链进行了分析,重点对煤炭、石油、天然气和岩盐四类产业链的构成进行了表述,并对其发展建设所需要的保障要素进行了讨论,提出了相关建议,对榆林市能源化工产业可持续发展提供参考和借鉴。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to