气象科技期刊2001—2007年主要评价指标分析

为客观定量地了解目前气象科技期刊的学术水平现状,促进气象科技期刊的发展,依据学术期刊综合评价指标,对2001—2007年气象科技期刊的影响因子、5年影响因子、即年指标、被引半衰期、Web即年下载率以及网络传播趋势等进行统计对比分析,得出了相关结论。     

The influence of gendered roles and responsibilities on the adoption of technologies that mitigate drought risk: The case of drought-tolerant maize seed in eastern Uganda

Gender-disaggregated, household survey data for Uganda are used to examine how gendered roles and responsibilities influence adoption of drought-tolerant (DT) maize, a new technology that can help smallholder farmers in sub-Saharan Africa adapt to drought risk. Multinomial logit (MNL) regression results indicate that, compared to men farmers, women farmers have much lower adoption of DT maize, mainly due to differences in resource access, notably land, agricultural information, and credit. Differentiation of women and men farmers by various characteristics reveals that whether a male farmer was younger or older, or poor or non-poor has no significant influence on DT maize adoption; but important differences among different categories of women farmers are identified. For example, the farmer group found least likely to adopt DT maize is young, poor women household heads. MNL results also show that wives strongly influence adoption of DT maize on plots controlled by their husbands. We discuss the implications of study findings for the development of well-targeted and socially-inclusive adaptation policies.     

The socio-political context for deploying carbon capture and storage in China and the U.S

Together, the U.S. and China emit roughly 40% of world's greenhouse gas emissions, and these nations have stated their desire to reduce absolute emissions (U.S.) or reduce the carbon intensity of the economy (China). However, both countries are dependent on coal for a large portion of their energy needs, which is projected to continue over the next several decades. They also have large amounts of coal resources, coal-dependent electricity production, and in China's case, extensive use of coal in the industrial sector, making any shift from coal socio-politically difficult. Both nations could use carbon capture and storage (CCS) technologies to simultaneously decrease greenhouse gas emissions and continue the use of domestic coal resources; however, the socio-political context for CCS deployment differs substantially between the two countries and potentially makes large-scale CCS deployment challenging. Here, we examine and compare the political and institutional contexts shaping CCS policy and CCS deployment, both for initial pilot projects and for the creation of large-scale CCS technology deployment, and analyze how the socio-political context for CCS in China and the United States aligns with national climate, energy security, and economic priorities.     

非开挖钻进工程最优穿越曲线的计算

在非开挖钻进工程中,穿越曲线的设计是第一个关键的工作,而只有根据现场条件设计计算出合适的穿越曲线,才能保证整个钻进穿越工程的顺利进行和完成。本文在满足相关规范要求的基础上,建立了穿越曲线的计算模型,并利用MATLAB计算程序对其进行优化计算,确定最短穿越距离,使得穿越工程费用最经济。通过现场工程的验证,该计算模型对现场施工有一定的指导意义。     

测绘产品从模拟到数字的拓展

随着传统测绘产业向地理信息产业的转化 ,数字化成为测绘生产的主要技术手段 ,数字测绘产品占有越来越多的市场 ,并从产品形式、产品功能、产品服务等几个方面为测绘技术革命带来了新的生机     

中国虚拟天文台数据访问服务

随着科学技术的进步和大批天文观测项目的实施，天文数据正在呈现爆炸式的增长，天文学正进入一个数据富庶的时代。虚拟天文台项目的首要目标就是要解决这些高度分散、复杂、海量的天文数据的统一访问和管理，实现全球天文数据资源的融合，使天文学家能够高效快捷的获取所需的天文数据。中国虚拟天文台项目基于目前的网格技术，设计和实现网格环境下天文数据的查询访问服务，并为客户应用提供统一的访问接口。本文重点介绍了我们采用GlobusToolkit网格开发工具包，按照国际虚拟天文台联盟最新制订的天文数据标准，完成对天文星表数据资源的网格服务封装，实现天文星表锥形查询(Cone Search)和星表查询网格两个数据服务的工作，并介绍了如何使用天文数据服务搭建其他网格服务。     

三轴条件下岩石抗剪强度参数线性回归法的修正

岩石三轴强度包络线通常为非线性,通过线性回归法（LRM）获得的抗剪强度参数对围压的变化具有很高的敏感性。为使 LRM能够考虑围压对抗剪强度参数估计的影响,定义了岩石三轴强度围压效应系数,构造一个指数函数表示该系数与围压的关系,并将其引入到 LRM 的修正中,提出考虑围压效应的线性回归分析法（CCPE-LRM）。同时,提出了CCPE-LRM 的合理性检验方法,并定义了距离系数作为指标来表征抗剪强度参数估计值与参数实际值的差异。通过以公开发表文献中多种类型岩石的三轴强度数据为例进行验证分析,结果显示各种岩石的距离系数均较小,CCPE-LRM 获得的抗剪强度包络线紧贴摩尔圆,且近似相切状态。表明通过CCPE-LRM 获得的抗剪强度包络线在一定程度上可以代替理想抗剪强度包络线,该方法估计的抗剪强度参数与理论抗剪强度参数的一致性较高,证明CCPE-LRM 具有较好的适用性。     

老采空区勘查技术方法研究

老采空区往往无矿产勘查资料和历史矿产开采资料,圈定采空区范围,分析采空塌陷灾害发育程度,只能通过多方面的地质勘查技术手段确定。本文通过实例浅部采空区勘查工作总结研究,采用地质调查、地球物理探测、钻探等多种勘查技术方法,综合研究分析如何准确圈定采空区平面范围,并通过岩石力学实验与计算的方法确定采空塌陷影响范围,为老窑采空区边界和深度的准确判定,提供实际经验和理论上的支持。     

EN LANDBRUGSGEOGRAFISK ANALYSE AF GADBJERG OG GIVSKUD SOGNE

Jensen, Kr. M. and Jensen R. Helkiær: En landbrugsgeografisk analyse af Gadbjerg og Givskud sogne. Geografisk Tidsskrift 76: 34—51. København juni 1. 1977.

The agricultural development in two parishes in a former heath region in Central Jylland has been investigated. The expansion of farmland up to the turn of the century was especially in Givskud replaced by a regression period with afforestation of marginal areas. The farmers are now increasing the size of their holdings and the specialization on few crops involves a more uniform land-use.     

Z igB ee 技术及其在地震监测中的应用研究

ZigBee技术是近几年短距离无线通讯技术领域研究的热点之一。文章分析ZigBee技术特点、技术原理及网络硬件实现方式,详细说明其在野外流动地震监测、通讯线路改造、无人值守台站的地震监测及前兆传感器的快速接入等方面的具体应用。