断块油气田裂缝研究在文留油田文13西块的应用

文章通过对文留油田文13西块裂缝进行研究，认识裂缝发育程度、分布及方向，特别是主裂缝方向，探讨裂缝对开发调整及开发分析的重要性，为开发油田，提高驱油效率提供科学依据。     

TRAFFIC MANAGEMENT IN WHOLESALE INTERNATIONAL ROAMING: TOWARDS A MORE EFFICIENT MARKET?*

Despite a general trend of lower charges for mobile calls, in Europe, prices for international roaming calls have remained at levels that are surprisingly high. The apparent reluctance of mobile network operators to lower roaming tariff is generating many antitrust concerns. This paper presents in a two‐country two‐firm framework the functioning of the current system governing wholesale international roaming agreements based on interoperator tariffs. The focus is on the role of traffic management; thanks to the emergence of traffic direction techniques, mobile network operators are allowed to select the roaming partner. We show that, unless these techniques do not allow for perfect control on traffic flows, traffic management does not improve the market's efficiency. In line with the regulatory mechanism recently adopted by the European Commission, we show that a simple price cap mechanism may restore partial efficiency in the wholesale market. We also show that although cross‐border cooperation at the wholesale level is Pareto efficient, it will not emerge as an equilibrium of a two‐sided matching game.     

药食真菌中微量元素分析测定及其研究热点

简要介绍了微量元素的生理作用及其对维持人体健康的重要性，综述了几种用于测定药食真菌中微量元素的现代分析测试方法等，例如：电感耦合等离子体一原子发射光谱法（ICP—AES）、分光光度法、原子吸收光谱法等。同时也概述了这几种测定方法的研究进展和在药食真菌开发中的应用，探讨了药食真菌生产中提高微量元素含量以增加其保健功效技术的发展方向     

某箱梁施工过程中开裂事故分析

文章对某铁路桥上简支箱梁在吊装落梁过程中端头面上出现较大裂缝进行分析,发现形成裂缝的主要原因是：在落梁过程中两侧吊杆的不同步松放导致梁体的扭转和施工过程中荷载偏差系数较大。相关计算结果可供同行在进行同类设计受力分析时参考借鉴。     

灌注式护坡桩的设计方法

本文从分析护坡桩常见的破坏方式及原因入手，提出在设计中应对一些主要问题根据不同的条件具体进行考虑，并对灌注式护坡桩的设计方法进行了探讨。文章首先分析了护坡桩五种常见的破坏方式及原因，并按悬臂式、单锚浅埋、单锚深埋三种类型探讨，论述了灌注式护坡桩的设计方法，同时对基底隆起问题及锚杆设计问题进行了分析。     

试析就业指导中的误区

近年来,由于毕业生数量的急剧增加,使指导大学生就业成为学生关注的热点问题,同时也出现了许多指导误区,对此,应看到它的危害,提高防范意识。     

Mental mapping and heritage visitors’ spatial perceptions

Visitors’ activities tend to be spatially oriented in destinations. Mental mapping is a useful method for revealing how visitors spatially perceive tourism destinations. However, studies of this kind are under-researched in the tourism field. Therefore, this study investigates the ways in which visitors spatially perceive the World Heritage Sites (WHSs) of Macau through the use of mental maps drawn by a sample of 400 respondents. Comparisons of the mental maps revealed that respondents possessed a relatively limited spatial knowledge of the WHSs, and this recognition varied according to the gender, place of origin, travel mode, type of trip, social interaction with local people and length of stay. While the real-life world of visitors was identified by the mental mapping approach, some suggestions for formulating strategies are provided.     

天水市三生空间功能转移及驱动力研究

以天水市近年四期土地利用数据为基础,利用GIS(地理信息系统)和土地利用转移矩阵、土地利用动态度、土地利用程度综合指数等指标与研究方法分析空间变化特征与驱动力因素。结果表明：天水市生产空间缩减,生活、生态空间扩张;农业生产用地综合转移面积最大;工矿生产用地动态变化最为明显;土地利用程度各区县总体格局不变;人为因素中规划与社会政策、人口数量与分布和自然因素中高程坡度、水文气象、资源分布对空间格局、变化方向影响显著。     

鉴相方法的分析与比较

简要介绍了干涉仪测向中模拟和数字两种相位差测量方法,重点对这两种方法的测向误差进行了分析,最后对鉴相方法进行了比较。     

一种快速子空间测向算法

考虑用户先验知识提出一种快速子空间测向算法,构造了方向约束的相关相减多级维纳滤波器(MCSA-MSWF)方法,此方法在降低特征分解的基础上进一步降低了谱峰搜索的运算量,且克服了单纯基于多级维纳滤波器测向算法期望信号不准确的问题。仿真表明,该算法在低信噪比、小快拍数情况下具有更好的估计性能。