基础加固斜锚杆桩的施工技术          下载免费PDF全文

祝剑敏 《探矿工程》1994,(6):6-8

以某地下连续墙斜锚杆支护工程施工为例，介绍了斜锚杆桩的施工工艺，主要包括：斜锚杆的设计；施工设备的选择及机具设计；灌浆锚杆的施工工艺等。  相似文献   

裸眼井中弹性波传播的非对称模式的数值研究   总被引：6，自引：0，他引：6       下载免费PDF全文

张金钟  郑传汉 《地球物理学报》1988,31(4):464-470

本文从数值上研究了裸眼井中弹性波传播的非对称模式,给出了合成微地震图和导波（弯曲波）的频散曲线,发现在“硬”地层和“软”地层的井中,导波都是高度频散的,其最大相速度等于地层的横波速度,其截止频率低于对称模式的伪瑞利波的截止频率;在低频（2-3kHz）和长源距（3-4m）的条件下,由非对称的声源（如声偶极子）所产生的微地震图中,初至信号是以横波速度传播的,而以纵波速度传播的信号被抑制。本文的结果对研制横波速度测井仪是有意义的。  相似文献   

测井数据采集处理系统的高分辨率图像显示     

贺利洁  宋宇澄 《吉林大学学报(地球科学版)》1988,(1)

测井数据采集处理系统的高分辨率图像显示器是对测井全过程,实时监视,完成计算机控制,人—机对话方式工作,并且进行汉字图头,刻度功能,还可以回放测井过程的任意井段的参数曲线。本文主要阐述高分辨率图像显示器示技术性能及组成。  相似文献   

基于GIS的精细化格点预报平台设计与实现——以青岛市为例   总被引：1，自引：0，他引：1  

宁方志  季民  陈许霞 《测绘与空间地理信息》2017,40(5)

针对目前天气预报发展需求,本文提出了精细化格点天气预报。不同于传统的站点天气预报,精细化格点预报平台是进行图像交互及编辑订正的平台,核心功能模块包括格点数据下载及解析、可视化显示、图形编辑订正和预报产品输出。目前,精细化天气预报平台已经应用于青岛市海洋气象服务平台,经过不断地改进,预报精度由原先的9 km提高到了现在的3 km,实现了青岛地区的24 h气象预报以及数据订正,减少了气象服务人员的工作量。  相似文献   

Analysis of pedestrian behaviors through non-invasive Bluetooth monitoring     

《Applied geography (Sevenoaks, England)》2017

This paper presents a novel framework to analyze pedestrians' behavioral patterns throughout shopping environments in the historical center of Barcelona, Spain. We employ a Bluetooth detection technique to capture a large-scale dataset of pedestrians' behavior over a one-month period, including during a key sales period. We focused on comparing particular behaviors before, during, and after the discount sales by analyzing this large-scale dataset, which is different but complementary to the conventionally used small-scale samples. Our results uncover pedestrians actively exploring a wider area of the district during a discount period compared to weekdays, giving rise to strong underlying mobility patterns.  相似文献   

Fisheries privatization,social transitions,and well-being in Kodiak,Alaska     

《Marine Policy》2015

Scholars and fishermen alike view the privatization of fishing rights as a fundamental driver of social change in fishing communities. This article presents the results of a mixed-methods ethnographic study in Kodiak, Alaska, exploring how fisheries privatization processes remake fishery systems. Findings from this study suggest that a diverse range of fishery participants share core values about the social dimensions of fishery systems. Support or opposition to past privatization processes tended to be articulated in reference to how these core values (e.g., hard work, opportunity, and fairness) were perceived to have been strengthened or eroded by such processes. Data from this study suggest that while still widespread in the Kodiak fishing community, core social values in fishing may be changing as a result of privatization processes. Although ethnographic and survey data showed a range of perspectives on the effects of privatization on fishing and the Kodiak community, study participants tended to talk about privatization as a significant change that had divisive, negative impacts in the community. Crew members and the next generation of fishermen were identified as disproportionately affected by privatization processes. Ethnographic data detail important shifts in the power, status, and livelihoods of crew members. Nearly all Kodiak fishery participants interviewed expressed concern about the future of fisheries access in the community for the next generation, in large part because of the substantial financial barriers to entry generated by privatization of fisheries access. Many discussed the need for more entry-level opportunities necessary for access in all fisheries.  相似文献   

国内太阳数据VO化初步方案   总被引：1，自引：0，他引：1  

林钢华 《天文研究与技术》2004,1(3):210-215

随着太阳物理研究的深入、观测仪器的发展、观测数据的积累，促使人们去思考这样的问题：利用全世界不同时间、地点、波段的太阳相关数据、历史数据去对很多悬而未解的科学问题寻求答案，同时使研究者容易的去检索这些数据，进行分析，这就是虚拟太阳天文台要解决的问题，也是为什么虚拟太阳天文台项目得到了全世界有关天文台、研究所和大学的积极响应和运作。本文介绍了国内应如何面对虚拟天文台的发展及国内太阳数据VO化初步方案。  相似文献   

Artisanal fishing in Andalusia (II): Safety and working conditions policy     

F. Piniella  J.P. Novalbos  P.J. Nogueroles 《Marine Policy》2008,32(4):551-558

In an earlier paper, we presented a statistical study dealing comprehensively with the so-called “artisanal fleet”, with data on the typology of vessels and on the extractive effort. In this paper, we focus our research on safety and working conditions.Although numerous factors are known that can directly influence the health of the sailor or fisherman, and that are present one way or another in both the fishing and merchant fleets, it is necessary to address in particular the problem of coastal fishermens’ health in order to identify areas of health and safety that need to be improved. The results of this analysis, among other aspects, identify the injuries associated with machinery, tools, nets and protection devices, the health status, the life styles and the working conditions.  相似文献   

US catch share markets: a review of data availability and impediments to transparent markets     

《Marine Policy》2015

A growing number of US fisheries are managed with catch share programs, which allocate exclusive shares of the total allowable catch from a fish stock to individuals, cooperatives, communities, or other entities. All of these catch share programs allow transferability of catch privileges in some form. Information on these transfers, particularly prices, could be valuable to fishery managers and to fishery participants to support management and business decisions and to increase efficiency of the catch share market itself. This article documents the availability and quality of data on transfers of catch privileges in fourteen US catch share programs. These catch share programs include several individual fishing quota (IFQ) programs and a number of programs that allocate catch privileges to self-organized cooperatives. Price information on catch share transfers is found to be limited or unavailable in most US catch share programs. Recommendations are made on how to improve the design of catch share programs and associated data collection systems to facilitate effective catch share markets, collection of catch share market data, and better use of information from catch share markets.  相似文献   

气举反循环连续取心工艺探索          下载免费PDF全文

殷国乐  王艳丽  陈浩文  王林清  许刘万 《探矿工程》2022,49(2):22-29

气举反循环钻进技术是钻井工程中一种比较成熟的钻进手段,已经得到了广泛应用。但气举反循环连续取心技术仍处在探索研究阶段,前人已经针对这一技术做了原理性探究试验,但尚未进行连续的取心试验,而且现有的双壁钻具也存在无法满足由于上返岩心质量和直径大对其密封性和耐用性的要求。因此有必要进一步开展理论研究、优化钻具设计、进行连续取心试验来探究这一工艺发展前景。通过试验证明大通径双壁钻具设计可靠耐用,成功连续取得岩心。所取岩心及时,无污染,代表性强,能较真实的反映地层层位、深度、颗粒级配,不存在对岩心反复冲刷及重复破碎状况。  相似文献