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双针热脉冲(DPHP)技术被用于原位测定海洋沉积物的热导率.数据处理过程直接决定从实测数据中提取热导率的精度与效率.根据实测数据,结合海上测量可能出现的问题,探讨了DPHP技术实测数据的处理方法,提出了一套数据预处理流程,并对2种热导率计算模型和计算方法进行了对比分析.研究表明,原始数据经过数据滤波、数据截取和背景场拟合剔除等预处理过程,得到的热脉冲温度响应曲线可用于热导率计算.计算热导率可采用K-B模型或者简化模型,后者具有降低运算量,减小误差积累的优点.热导率计算方法有极值法和拟合法,如果采样率足够高,极值法是首选方法. 相似文献
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Peck公式在我国隧道施工地面变形预测中的适用性分析 总被引：26，自引：3，他引：26
在目前众多的预测地铁隧道开挖引起的地表位移的经验方法中，Peck于1969年提出的高斯方程最简便，也是目前应用最为广泛的方法。由于这一公式是基于有限地区的实测资料提出的，因此，在某个地区应用前首先应该进行基于当地实测资料的验证工作。国内地铁建设工作起步相对较晚，在土中开挖的浅埋隧道工程引起的地层变形实测资料比较缺乏，因此，目前对Peck公式在国内各地区的适用性还没有定论。近年来，随着地铁建设热潮的兴起，各地逐渐积累了一些实测资料，但仍比较零散，也没有形成比较统一的结论。通过对搜集到的国内8个地区30多组观测数据的分析，评价这一方法在不同地区的适用性，并对相关计算参数提出初步建议值。 相似文献
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相干技术在三维地震勘探构造解释中的研究与应用 总被引：12，自引：6，他引：6
我们在文中详细探讨了相干技术在断层识别中的应用,并针对三维地震资料,提出了一种具体实用的算法,为地震资料解释提供了一种新的方法和手段。依此方法编制了相应的处理软件,对实测三维地震资料进行了处理,取得了显著的效果。 相似文献
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我国土地资源尤其耕地资源十分紧缺,农村居民点布局多、广、散,农村集体建设用地闲置浪费问题比较突出。农民进城买住房同时又在宅基地建房,形成“两头占地”的局面。据资料统计,改革开放以来农村劳动力转移了1．8亿人,但农村住宅用地不减反增150万亩。同时,城镇化转移的劳动力与农村新增人口都享有平均分配的承包地,加剧了土地分散经营与集约利用的矛盾,制约了农业综合生产能力的提高。 相似文献
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借助于GIS技术对大流域进行划分与编码.修正实测河道上部分栅格单元的高程,以避免大面积“伪洼地”的出现,从修正后的栅格型数字高程模型(DEM)提取出与实测河网比较一致的模拟河网.提取出模拟河网后,再进行河网的编码,以及流域的划分与编码.提出了一种对Pfafstetter规则的改进方法,并且按照改进后的Pfafstetter规则来对河网与流域进行编码.所有编码工作是由本次研究中专门编制的程序来自动完成.将提出的方法应用于黄河流域,将整个黄河流域划分为8 255个子流域并赋予了Pfafstetter编码. 相似文献
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本文以大量的实测资料为依据,总结了岩矿石电磁频散的规律性。结合电磁波勘探方法中的实际问题,讨论了频散对相位常数α和吸收系数β所产生的影响及误差。提出了在实际工作中对频散进行校正的必要性,并且给出了校正公式。 相似文献
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随着我国社会的发展和经济体制改革的不断深入,农村土地流转的方式越来越多,范围越来越广。如何在保障农户土地承包经营权的前提下,推进土地承包经营权有序流转,提高农业产业化水平是深化农村改革的一个现实课题和长远目标。该文以宋村镇农村土地承包经营权流转的调查数据为例,分析了土地流转的现状和特点,指出当前存在的矛盾和问题,提出了农村土地流转机制的对策和建议。 相似文献
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第二次全国土地调查工作中,城镇与农村地区的土地面积在计算方法上有所不同：农村地区的土地面积是以椭球面为基准的面积,即球面面积;城镇地区的土地面积是以平面为基准的面积,即平面面积。二者之间存在差异并按一定规律变化,当调查区处于投影带边缘附近时,同一图斑的球面面积与平面面积之间的差异达到最大。由于采用不同的计算方法而导致面积数量的差异,在进行农村与城镇有关土地数据整合时会出现矛盾。为了建立城乡统一的土地管理信息系统,保证土地面积的一致性,应当采取相应措施消除二者之间的差异。 相似文献
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第二次土地调查是一项重大的国情国力调查,目的是全面查清全省土地利用现状,掌握真实的土地基础数据,建立和完善土地调查、统计和登记制度,实现土地调查信息的社会化服务,满足经济社会发展及国土资源管理的需要。本文以濉溪县为例,介绍安徽省农村土地二调内业建库流程及数据库维护步骤,发现并解决了内业建库过程中遇到的一些问题。 相似文献
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区域综合地质调查是助力乡村振兴的基础性工作和重要技术支撑。本研究基于地质视角解读乡村振兴,围绕乡村人地安全、产业发展、地质文化、环境保护等方面进行剖析,提出地质灾害调查、工程地质评价、水文地质调查、农业地质调查、旅游地质遗迹调查等区域综合地质调查助力乡村振兴的关键内容;为提高助力效率效果,需做好项目顶层设计、制定乡村地区区域地质调查技术要求等标准、构建服务地方工作机制、开展系统人才培训培养等战略路径。未来乡村发展中,应进一步解决区域统筹部署与重点发展村镇选择、综合地质调查与乡村规划建设空间尺度匹配、综合地质调查和纵向专业性调查配合使用、工程地质评价与乡村地下空间集约利用、地质文化村建设与乡村规划建设衔接等问题,不断提高区域综合地质调查技术方法的服务能力,为乡村可持续振兴提供解决思路和方案。 相似文献
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Land is the core of the predominantly agrarian economy of Cameroon. It is therefore an important factor of production to both men and women particularly in rural areas. While the legal framework in Cameroon advocate for equal rights and opportunities to resources, the majority of rural women who are mostly peasant farmers can neither inherit nor own land due to gender discriminatory customary practices. This study examines some of the arguments for sustaining these customary practices that violate women’s rights over the years and the role of these ‘landless’ women in poverty alleviation. The study is based on a field survey which was conducted among some 2,205 respondents in 2009 using questionnaires, interviews and focus group discussions in Anglophone Cameroon. The findings revealed that although women are the livewire of rural households and key players in the struggle against poverty who depend solely on land, they still do not have security of tenure over the land they cultivate. The paper argues that even though women are assuming increasing roles in the education of the children, provision of food and paying for medical services for the homes, there are still some traditional belief systems that work against their rights to land. These belief systems have a strong grip on the attitudes and perception of both men and women on women’s rights to land in that even when men and women are unanimous on the need for women to own land, they both disagree on how they should own the land. The logical outcome of this dilemma is that men own the land while women work on it. The latter have very little possibilities to carry out any long term investment on land without the blessing of the former. We thus, advocate for gender mainstreaming in land reforms and gender consciousness among traditional authorities, men and even among the women as some of the ways of redressing gender discrimination in land ownership rights and poverty particularly in rural areas. 相似文献
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G. J. Osemeobo Dr. 《GeoJournal》1991,23(3):241-248
A survey was conducted in 21 rural settlements to assess wildlife conservation under a common utilization. Wildlife was managed through traditional regulations to meet subsistence requirements for food, income, recreation and health care. However, the conditions under which common property resource utilization thrived: traditional beliefs, communal land tenure system and uncertain income streams were almost disintegrated by changes in land use and social attitudes.The resource base for rural economies, the natural vegetation, was in crisis of depletion and degradation due to modern techniques of agricultural and forestry production. A conservative strategy is suggested. Rural land use should be based on planned agroforestry practices: smallholder tree planting, protection and regeneration of indigenous plants with potential social and economic value, domestication of wild animals and ranching of game with livestock. 相似文献
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Noëlle Boucquey Lisa M. Campbell Gabriel Cumming Zoë A. Meletis Carla Norwood Joshua Stoll 《GeoJournal》2012,77(1):83-101
This paper contributes to ongoing discussions about the implications of rural change and amenity migration for members of
diverse rural communities. We engage with recent amenity migration and political ecology literature that focuses on social
constructions of nature and landscapes, and how these constructions affect the attitudes and opinions of community members.
We use our case study of a mail-based survey in Down East, North Carolina to suggest that the ways in which people conceptualize
the particular ‘natures’ and landscapes of a place matters in terms of shaping people’s attitudes with respect to ongoing
processes of change. We find that people’s opinions about environment, culture, and land use are often superficially similar
but that when conflicts arise or particular actions are considered, substantial differences in people’s underlying conceptual
frameworks are revealed. In particular we find that despite widespread shared appreciation of the environment and culture
Down East, differing interpretations of these key terms lead to potential misunderstandings and land use planning challenges. 相似文献
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蒙阴县充分利用城乡建设用地增减挂钩政策,加大农村居民点的整合搬迁复垦力度,积极推进新农村建设,改变了村容村貌,缓解了发展与用地的矛盾,加快了城乡统筹的步伐。 相似文献