检索结果-南通市图书馆

Thermal influence of ponding and buried warm-oil pipelines on permafrost: a case study of the China-Russia Crude Oil Pipeline

引用

Research in Cold and Arid Regions 2020年第2期12卷 59-70页

作者： YanHu Mu MingTang Chai GuoYu Li Wei Ma Fei Wang YaPeng Cao State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Sciences Beijing 100049China

Buried pipelines are widely used for transporting oil in remote cold regions. However, the warm oil can induce considerable thermal influence on the surrounding frozen soils and result in severe maintenance problems. This paper presents a case study of the thermal influence of ponding and buried warm-oil pipelines on permafrost along the China-Russia Crude Oil Pipeline(CRCOP) in Northeast China. Since its operation in 2011, the operation of the warm-oil pipelines has led to rapid warming and thawing of the surrounding permafrost and development of sizable ponding along the pipeline route,which, in return, exacerbates the permafrost degradation. A field study was conducted along a 400-km long segment of the CRCOP in permafrost regions of Northeast China to collect the location and size information of ponding. A two-dimensional heat transfer model coupled with phase change was established to analyze the thermal influence of ponding and the operation of warm-oil pipelines on the surrounding permafrost. In-situ measured ground temperatures from a monitoring site were obtained to validate the numerical model. The simulation results show that ponding accelerates the development of the thaw bulb around the pipeline. The maximum thaw depth below the pipeline increases from 4 m for the case without ponding to 9 m for the case with ponding after 50 years of operation, and ponding directly above the pipe induces the maximum thaw depth. Engineering measures should be adopted to control the size or even eliminate surface water-rich ponding for the long-term performance of buried warm-oil pipelines.

关键词： ponding heat transfer modeling oil pipeline permafrost thaw depth

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Relationship between ponding and topographic factors along the China-Russia Crude Oil Pipeline in permafrost regions

引用

Research in Cold and Arid Regions 2019年第6期11卷 419-427页

作者： MingTang Chai YanHu Mu GuoYu Li Wei Ma Fei Wang State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Sciences Beijing 100049China

The original landform along the China Russia Crude Oil Pipeline(CRCOP,line 2)was disturbed during installation of pavement for the *** and vegetation coverage is dense,and runoff develops along the *** the opera tion of the CRCOP(line 2)began in 2018,ponding has appeared on both sides of the *** there is no drainage,ponding can hardly dissipate,due to the low permeability of the permafrost *** the supply of surface flow and the transportation of oil at positive temperatures,ponding promotes an increase in temperature and changes the boundary ther mal conditions of the ***,when the ponding freezes and thaws,frost heave threatens operational safety of the ***,the ponding can affect the thermal condition of line *** this paper,the distribution of pond ing along the CRCOP was obtained by field *** type and cause of ponding were summarized,and the catch ment and stream order were extracted by the Digital Elevation Model(DEM).According to the statistical results in attri butes for topographic factors,it is known that ponding along the pipeline is relative to elevation,slope,aspect,and the Topographic Wetness Index(TWI).Water easily accumulates at altitudes of 300450 m,slopes within 3°5°,aspect in the northeast or south,TWI within 1316,flow direction in north east south,and flow length within 90150 *** paper proposes a theoretical basis for the cause and characteristics of ponding along the pipeline.

关键词： permafrost Digital Elevation Model(DEM) Topographic Wetness Index(TWI) pipeline ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SIGN TYPES AND KAZHDAN-LUSZTIG CELLS

引用

Chinese Annals of Mathematics,Series B 1991年第1期12卷 33-39页

作者：杜杰 Department of Mathematics Fast China Normal UniversityShanghaiChina.

This paper studies the relations between sign types and left cells in an affine *** is proved that any left cell is a union of finitely many connected sets in the senseof [5].Also,a geometric explanation of the finite... 详细信息

关键词： affine connected union finitely explanation suppose assume 从时七无 ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

INVERSE THEOREMS IN Lp FOR SOME MULTIDIMENSIONAL POSITIVE LINEAR OPERATORS

引用

Chinese Annals of Mathematics,Series B 1991年第4期12卷 525-530页

作者：周定轩 Department of Mathematics Zhejiang University Advanced Institute of Mathematics Hangzhou Zhejiang China

Let {Ln}n∈s be positive linear operators in LI, I=[0, 1] or [0, ∞). This paper considers their variants in Lp（I×I）Ln,m（F; x, y）=Ln（Lm（F（u, v）; y）; x）=Lm（Ln（F（u, v）; x）; y）, n, m∈*** characterization problem for these operators is solved which gives the inverse theorems in Lp for multidimensional Bernstein type operators.

关键词： operators inverse 切二 Uniform Budapest devoted analogues 二土二七 ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A GENERAL BOOLEAN LATTICE IS RESTRICTED AND AFFECTED BY ITS CONVEX SUBLATTICE

引用

Chinese Science Bulletin 1990年第1期35卷 82-84页

作者：董荣森 Department of Mathematics Jiangxi Normal University Nanchang 330027 PRC

The following results in this letter have been *** 1. If a is an element of a general Boolean lattice L, then the lattice of all the congruences on L is isomorphic to the lattice D of all the nonempty convex sublattic... 详细信息

关键词： isomorphic nonempty convex letter Boolean congruence subset 护印七印 ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE DISTURBANCE COMPENSATION AND DELAY COMPENSATION USING EXPANSIVE CONTROL VECTOR

引用

Chinese Science Bulletin 1989年第20期34卷 1759-1760页

作者：童调生童季贤方定菲黄伟 Hunan University Changsha Neijiang Teachers' College

Suppose that the control delay system with external disturbance w （k）is where x（0）, u（-1）, u（-2）,…, u（-Mq） are given, and 0=M0q, x∈Rn,u∈Rr,w∈Rm.

关键词： disturbance compensate ponding continued Construct 如叨

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STUDY ON COENZYME B_(12) MODEL COMPOUNDS——CHARACTERIZATION OF GAS PHASE PRODUCTS IN THERMOLYSIS OF SCHIFF BASE ALKYLCOBALT COMPLEXES BY GAS CHROMATOGRAPHY

引用

Chinese Science Bulletin 1992年第12期37卷 1053-1054页

作者：陈冠菁陈慧兰张文彬唐雯霞 Department of Chemistry Center of Materials Analysis Institute of Coordination Chemistry Nanjing University Nanjing 210008 PRC

Two series of Schiff base alkylcobalt complexes: alkylcobaltbis （salicylaldehyde） ethylendiimine RCo （Salen） L and a kind of new Coenzyme B12 model compounds alkylcobaltbis （salicylaldehyde）-2, 3-dimethyl-2, 3 b... 详细信息

关键词： Salen ethane alkyl Schiff complexes tempera isomers steric equatorial ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling the effects of rainfall on vehicular traffic

引用

Journal of Modern Transportation 2018年第2期26卷 133-146页

作者： Etikaf Hussain Syed Imran Ahmed Mir Shabbar Ali Civil Engineering Department NED University of Engineering & Technology Faculty of Civil Engineering and Architecture NED University of Engineering & Technology

Traffic management and drainage system are two vital issues for any metropolitan city. Like other big cities, Karachi is also facing problems due to lack of traffic management and poor drainage system. The main objective of the study is to model the interdisciplinary issues of storm water and its effect on the traffic of Karachi. The specific objectives are （1） to calibrate and validate urban hydraulic and traffic micro-simulation models and （2） to model storm water and traffic for future conditions. This study is carried out on a 3-km section of arterial road. In this study, loose coupling of two models is done. For urban drainage, PCSWMM, and for traffic, VISSIM is used. Both models are calibrated for an existing situation on rainfall event of August 3, 2013, and then used for prediction of future scenario based on 50-year and 100-year return periods of rainfall. Sensitivity analysis of VISSIM is performed. Locations and lengths of road sections, where ponding happens for the future scenario, are identified using PCSWMM. These lengths axe then marked in VISSIM as low-speed areas, and delays are measured. Analysis of PCSWMM shows that for 100-year return period, there is maximum 0.318 ha-m （3180 cubic meters） water stored in the depressions of the road after 10 h of rainfall. Analysis of VISSIM shows that for a 100-year return period, there is a maximum delay of 35 min on NIPA to Hasan Square section of University Road.

关键词： Traffic micro-simulation Hydraulic modeling Rainfall Delays ponding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ON THE 2ND POWER OF PRIME MEROMOPRHIC FUNCTIONS

引用

Chinese Annals of Mathematics,Series B 1989年第4期10卷 441-447页

作者：郑建华 Department of Mathematics Anhui University Hefei Anhui China.

In this paper, the author respectively constructs the prime entire function and the prime non-entire meromorphic function of finite order whose 2nd power and derivative are not pseudo-prime so that the answer to the Problem (A) Song-Huang posed is in the affirmative. And it is exhibited that none but periodic meromorphic functions has the property mentioned in Problem (A).

关键词： answer posed constructs mentioned derivative polynomial assume ponding remaining proof

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ON TFE THIRD CONJECTURE OF ***

引用

Chinese Annals of Mathematics,Series B 1989年第2期10卷 236-240页

作者：董太亨水乃翔 Department of Mathematncs Hangzhou University Hangzhou Zhejiang China

In this paper, the authors prove following result:Let Mn be a complete Bechner-Kaehler submanifold of complex dimension （n≥4） in a complex projective space CPn+p（1） of complex dimension n+p, endowed with the FubiniStudy metric of constant holomorphic sectional curvature 1. If the sectional curvature K of Mn satisfies Kn is not less then n（n+1）/2.

关键词： curvature projective endowed sectional manifold 召八 lemma ponding spreading begin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：