共查询到20条相似文献，搜索用时 156 毫秒
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本文介绍一个因素的方差分析BASIC程序,并举例演示了该程序的使用方法。该程序通用性强,在生产中有一定的实用价值。 相似文献
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研制了“二维小波分析”程序系统，旨在能够广泛地应用于地球物理数据处理和其他应用领域，这里介绍“二维小波分析”程序的运行环境、安装和使用方法步骤，展示程序的处理功能，介绍一些处理结果和应用效果。 相似文献
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本文介绍两类线性判别分析BASIC程序,并以化探中判别未知异常归属为例演示该程序的使用方法。该程序在生产中有一定的实用价值。 相似文献
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在石根华先生DDA程序的基础上,中国水利水电科学研究院作了二次程序开发,实现了Windows用户界面,丰富了前后处理的功能,计算中也可以模拟边坡的开挖过程。介绍了程序的新功能、新特点以及程序在向家坝重力坝抗滑稳定性研究中的应用。 相似文献
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针对我处煤矿生产测量工作的现状和特点，结合实际计算程序，介绍了可编程序计算器应用的优点及其应用方法。 相似文献
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本文介绍了3个方差分析的BASIC程序及其在地质工作中的应用,程序适用于PC-1500机.双因素方差分析程序,用于按两种方式设计的方差分析;三因素方差分析程序,用于按三种方式设计的方差分析;多因素方差分析程序,对于按系统分组的数据实行方差分析. 相似文献
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文章介绍了作者根据赤平投影原理,在AutoCAD平台上用AUTOLISP语言编写的自动绘制赤平投影图进行边坡稳定性分析的程序,并对该程序的应用作了演释。该程序具有操作简单,得出的参数准确,实用方便等优点。 相似文献
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油气成藏过程的动力学研究是以一期油气成藏过程中从油气源到油气藏的统一动力环境系统为单元,定量研究油气供源、运移、聚集的机理、控制因素和动力学过程。以此为基础有望解决油气成藏定量的动力学研究中的几个关键问题。输导层概念的提出及砂岩输导层模型基本工作程序的建立,形成了可以利用通常的物性参数进行输导层量化表征的方法,实现了对油气运移通道的量化表征; 采用断层连通概率的概念对各种参数表征断层开启性的能力进行比较和评价,探讨了各种地质参数的有效性和代表性,建立起了断层启闭性表征参数的评价方法; 采用数值模拟方法,耦合运聚动力与输导体系,实现成藏系统内油气运移过程的模拟分析; 以运移途中烃损失量估算为基础,建立新的物质平衡方法,以模拟获得的运移路径为线索,评估油气在研究不同方向上的运移聚集量,展现油气运移的路径特征、运移方向及运移量,初步形成了以油气成藏动力学成因为基础的油气资源预测方法。 相似文献
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我国铅锌产业发展虽然成绩显著,但资源问题是制约铅锌产业链协调发展的重要因素,开发利用海外铅锌资源是促进我国铅锌产业健康发展的长期战略方针。在总结国外海外资源开发经验的基础上,阐述了我国铅锌资源海外战略的基本原则及近期与中长期的战略目标,并对战略重点做了详细部署。 相似文献
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Raju J. Das 《Geoforum》2002,33(1):55-72
The paper deals with the effects of the green revolution (GR) technology on poverty both conceptually and empirically. It provides a brief overview of the GR debate and then presents a `slice' of this debate in detail - in particular, Lipton's and others' views on the supposed positive and negative benefits of the GR for the poor. The paper then provides a provocative critique of this literature for its underlying neo-Malthusianism of a specific type, for ignoring class issues in the analysis of the GR-poverty relation, and for treating this relation as a necessary relation. It subsequently presents an alternative statement on the GR-poverty issue, arguing that it is class relations that set limit within which population and technology work and affect poverty and that the GR-poverty relation is a contingent one, rather than necessary. In the light of the paper's criticisms and the alternative view it provides, a statistical analysis of the relation between the GR and the population factor on the one hand and poverty level and poverty reduction on the other in India is performed. This analysis is generally consistent with the paper's critique of the Liptonian framework. 相似文献
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A. Boulton D. Fornasiero J. Ralston 《International Journal of Mineral Processing》2003,70(1-4):205-219
The surface analytical techniques of X-ray Photoelectron Spectroscopy (XPS) and Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS) have provided information on the type and concentration of species on the surface of sphalerite and pyrite particles in flotation concentrate and tail samples, but also on their distribution on each particle and across particles of different sizes. From this surface analytical study, a more accurate interpretation of the flotation results of sphalerite and pyrite minerals in a mixed mineral system could be made as a function of the concentrations of copper sulphate activator and xanthate collector, and particle size. In particular, it was found that sphalerite particles reporting to the concentrate are larger in size and contain less iron hydroxide on their surface than particles reporting to the tail. As for the pyrite particles, their lower recovery than the sphalerite particles is the result of a larger proportion of iron hydroxide on their surface inhibiting copper and collector adsorption. 相似文献
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Conservation tillage and input use 总被引：1，自引：0，他引：1
N. D. Uri 《Environmental Geology》1997,29(3-4):188-201
There continues to be a question as to the overall effectiveness of conservation tillage practices in reducing the impact
of agricultural production on the environment. While it is generally recognized that water runoff and soil erosion will decline
further, as tillage and mulch tillage systems are not used more extensively on cropland, what will happen to pesticide and
fertilizer use remains uncertain. To gain some insight into this, the conservation tillage adoption decision is modelled.
On the assumption that the decision to adopt conservation tillage is a two-step procedure, the first decision is whether or
not to adopt a conservation tillage production system and the second concerns the extent to which conservation tillage should
be used – appropriate models of the Cragg and Heckman (dominance) type are estimated. Based on farm-level data on corn production
in the United States for 1987, the profile of a farm on which conservation tillage was adopted is that the cropland had above-average
slope and experienced above-average rainfall, the farm was a cash grain enterprise, and it had an above-average expenditure
on pesticides and a below-average expenditure on fuel and custom pesticide applications. Additionally, for a farm adopting
a no-tillage production practice, an above-average expenditure was made on fertilizer.
Received: 18 September 1995 · Accepted: 6 December 1995 相似文献
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为探明细沟形态演变对坡面产流产沙的互反馈作用,采用室内模拟降雨和三维地形扫描等手段对细沟形态演变中的水沙变化过程进行了研究。试验分析了黄土在不同雨强（66 mm/h、94 mm/h和127 mm/h）条件下,不同细沟发育阶段的水沙过程变化规律。结果表明,黄土细沟形态演变过程对产沙的影响较大,而对产流的影响较弱。径流量的变化过程主要取决于土体透水性、土壤的结皮作用以及产流方式,坡面产流量有先增大后减小最后趋于平稳的趋势;产沙量的变化过程与细沟发育进程有明显的对应关系,尤其是坡面地貌信息熵与产沙量和侵蚀速率的相关系数分别达到0.954和0.916,细沟的出现会加剧侵蚀,使含沙量明显增加;不同雨强下坡面产沙的变化规律基本相同,细沟沟网稳定后的产沙量与降雨强度呈正相关关系。 相似文献
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俄罗斯不仅是世界上石油、天然气储量和开采量大国,而且是长输油气管道技术水平较高的国家.以近年来俄罗斯长输油气管道事故统计资料作为切入点,分析了俄罗斯长输油气管道事故的类型及发生的原因,并提出了对中国现役管道管理的建议和将建管道应注意的事项. 相似文献
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地埋管与土相互作用分析模型及其参数确定 总被引：9，自引：3，他引：6
对地埋管道结构分析,考虑管道与土的相互作用问题是非常必要的。其相互作用问题可归结为界面处接触应力的确定,为此,基于地埋管道受力特征的实测结果,建立了地埋管道与土的相互作用分析组合模型,并给出了模型参数的确定方法。由于管与土和管与基床的相对刚度对管土接触面上分布应力的影响显著,在确定其相互作用模型参数时,利用实测结果对其进行了修正,从而,将管道刚度的影响融入到相互作用分析模型中。 相似文献
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Uzo M. Igbozurike Dr. 《GeoJournal》1978,2(5):443-449
Although polyculture or interplanting is a dominant production method used by traditional cultivators in the tropics, there has been increasing emphasis on monoculture in agricultural development planning. Analysis of the economic and ecological consequences of these two cropping alternatives in a densely-populated area of eastern Nigeria suggests that a focus on monoculture as a panacea for increasing productivity and food supply is questionable. Polyculture is held to be ecologically superior to monoculture and, in the field area examined, economically more productive as well. Thus further investigation of polycultural approaches to agricultural development would appear to be warranted. 相似文献