共查询到20条相似文献,搜索用时 273 毫秒
1.
逆矩阵是线性代数中关于矩阵的一个基本问题。本文应用大家所熟悉的Excel软件,给出了在Excel中计算矩阵的逆矩阵的方法。该方法简单、直观,不需要设计程序,也不需要专门的数学软件。 相似文献
2.
3.
4.
5.
6.
Excel软件在林木采伐作业设计角规样地中的应用 总被引:1,自引:0,他引:1
利用Excel软件的函数功能,建立林木采伐作业设计角规样地表,操作规程为:1填写树种名和形高、出材率代码;2录入树种、径阶、断面积、平均高等调查数据;3填写采伐小班面积,其它数据可自动生成并进行汇总计算。通过Excel软件解决了角规样地调查内业查表、计算等工作繁琐、容易出错等问题。 相似文献
7.
8.
9.
方差分析是数理统计中常采用的一种方法.通过实例介绍了如何使用Excel中数据分析工具进行方差分析的方法;实现了数据分析和处理的快捷、准确和直观;与以往的手工处理和查表计算等方法相比较,具有重大革新和改进,既有利于提高数据处理效率,又降低了试验成本. 相似文献
10.
在事业单位财务工作中,Excel辅助电算化软件解决实际问题,Excel是目前最佳的电子表格系统,其具备强大的功能,包括丰富的函数功能、强大的表格处理功能、丰富的图表功能等.目前在实务中,各种表格的制作处理,vlookup函数在收入统计中的应用、if函数在年终奖金计税中的应用、图表在部门决算报表分析中的应用等功能,很大程度上提高了工作效率和技能,让大量重复性工作转变成轻松而有趣的事情.另外,Excel的数据分析功能也会进一步加强财务数据分析,提高管理决策水平. 相似文献
11.
12.
树干解析内业处理系统的研制 总被引:1,自引:0,他引:1
利用VB语言研制的树干解析内业务处理系统,可在WINDOWS9.x系统下直接运行。该系统具有数据管理、计算、显示和图表打印等功能,使用简便,结果显示直观,打印方便,通用性好。 相似文献
13.
Skyline是一款当前世界应用较为广泛的三维地理信息系统软件,能够快速地融合数据,更新场景数据库,展现三维地理空间数据,功能强大。本文从地表模型和建筑模型的制作入手,结合实验探讨如何在B/S框架下构建三维地理信息系统,同时也系统性的分析了Skyline在部署和应用过程中所采用的先进技术和特点。 相似文献
14.
15.
《Scandinavian Journal of Forest Research》2012,27(1):62-71
A method is introduced in which qualitative information obtained in a public participation process is transformed into quantitative spatial decision support for forest management planning. In the first phase, qualitative analysis is implemented by using the tools of qualitative research analysis. Then, a method is developed whereby it is possible to connect the expressed opinions to certain locations, to weight these opinions in a sensible way, and then to combine them in the form of a score map. In this phase, geographic information system (GIS) and preference analysis tools were used. The case study, carried out in the area managed by the Finnish Forest and Park Service, illustrates how to pack huge amounts of unstructured public feedback as decision support. The result of the analysis was a score map ranking pixels in the study area according to the aggregated preferences and norms expressed by public. Based on the case study experiences, it was concluded that most of this kind of public feedback can be illustrated for decision makers by using a few score maps. 相似文献
16.
The growing awareness of the importance and potential of agroforestry has resulted in an invaluable proliferation of site specific case studies. These presently exist in the necessary quantity and quality so as to facilitate their aggregate utilization in larger-scale research and application inquiry. We report here an approach for aggregating and using agroforestry case studies for agroforestry-related research at scales larger than the local site. The work presented here describes how ICRAF's agroforestry database — the primary source of case studies — can be used in combination with satellite imagery, and ancillary information, via matrix operations and a geographic information system, to produce a GIS-based agroforestry research tool for subSaharan Africa. This tool is used in a large-scale and preliminary way, to estimate the areas to which appropriate agroforestry systems in Africa might be extended. 相似文献
17.
The purpose of this study is to develop new porous carbon materials by carbonising wood-based materials. One of the advantages of wood-based materials used as precursors for porous carbon materials is the simple and cost-effective production technique. Moreover, it is possible to make adjustments for a wide range of macro- and micro-structures by selecting different densities and particle sizes. Compared with solid wood, wood-based materials possess much greater homogeneity, isotropy and reproducible characteristics. Another great advantage is the fact that carbon materials can thus be produced from a renewable resource. A broad variety of specifically developed wood-based materials were carbonised to produce porous carbon materials for which characteristics such as density, yield, dimensional changes and surface area were determined. Light microscopy and mechanical testing were applied for further characterisation. The results showed how density and particle size affect the structure of the carbon materials; dimensional changes and mass loss are influenced by the carbonisation temperature, adhesive content and apparent density; increasing particle size decreases flexural strength and increasing apparent density or adhesive content raises flexural strength super-proportionally; and specific surface area increases with rising carbonisation temperatures. 相似文献
18.
随着集体林权制度改革在湖北的稳步推进,林业经营模式的不断创新,对该省的森林资源资产评估工作也提出了新的要求,笔者就目前该省森林资源评估工作存在的问题进行了深层次分析,从如何正确界定森林资源资产产权范围,如何设立机构、建立机制、规范管理等方面提出了自己的一些观点,供同行参考。 相似文献
20.
墨西哥哈里斯科(Jalisco)林分结构小面积估测 总被引:2,自引:0,他引:2
对小的生态经济区开展自然资源统计是很困难的,政府决策人员只能依靠州水平的数据库来评价一定区域或局部的自然资源(森林、牧场、草地、农田等)状况。小面积评估技术可以用于评定这些资源。然而,哪一种小面积估测法可以给出最可靠、最准确的结果还不得而知。本研究检测了小面积评估分析常用的两种方法(即综合估计法和回归估计法)的可靠性、准确性。运用这两种方法分析墨西哥哈里斯科(Jalisco)州全州的自然资源数据,从而检测每种方法对所选择的森林林分结构特征预测结果的好坏。研究表明,回归方法在多个地理尺度上,对森林林分结构特征预测的可靠性和准确性均最好。因此,推荐州或地方资源管理者,在没有其他适当的辅助信息资料的情况下,可运用回归分析法来评估小区域内自然资源状况。图4表5参14。 相似文献