基于无线遥控技术的配电网带电作业工具

配电网不停电作业受人员作业思维、技能素质、线路结构等因素影响较大,现有带电作业法(直接作业法和间接作业法)已不能适应供电可靠性提高的要求和社会公众对连续供电的期望,改进现有的带电作业法是大势所趋.提出基于无线遥控技术的配电网带电作业工具充分利用无线通信技术,融合了绝缘杆作业法、绝缘手套作业和综合作业法的优点,采用液压动...     

基于知识和数学模型的农业专家系统生成工具

本文阐述利用面向对象技术开发通用农业专家系统生成工具ＡＥＳＴ的方法,介绍面向对象的知识库、模型库和通用推理机的设计与实现。     

基于ArcGIS的林地面积精确分割方法研究

以ArcGIS 10.2.2浮动版为平台,结合实例阐述在宗地结构中用宗地编辑器分割宗地,从宗地结构中导出图层,将图层和从宗地结构中导出的图层加载到ArcMap内容列表中,在ArcMap内容列表中用裁剪面工具捕捉导出图层的端点、折点分割图层,实现林地面积精确分割。认为该方法在林业工作中是一种实用的方法。     

学前教育专业学生职业心理素质测量工具研究

学前教育专业学生职业心理素质是指与幼师职业发展密切相关的将来从事幼师职业不可缺少的基本素质，其心理素质结构维度包含职业个性、职业情感、职业适应性。学前教育专业学生职业心理素质测量工具由一阶7因子37个题项组成。总量表Cronbach α=0.897，分半信度为0.736，表明量表具有较好的信、效度，可广泛用于学前教育专业学生职业心理素质测量，为学前教育专业学生职业心理素质教育及相关研究提供依据，也可为幼师职业有关单位选人用人提供依据。     

数控实训中心数控机床的维护与保养研究

数控加工实训是机电工程分院主要的核心专业实训之一,但由于学院校内数控集中实训很多,所以数控实训中心一直是处于超负荷工作状态,为了保证数控实训正常有序的执行,数控机床设备的维护保养工作显得尤为重要。     

基于i-Tree Eco模型的城市林冠雨水截留和径流削减效益研究——以北京建筑大学西城校区为例

乔木冠层雨水截留作用对降雨产流和径流削减有显著影响,而国内相关的模型研究较少。在现有城市截留效益模型比较和植被实地调查的基础上,利用i-Tree Eco模型评估2014~2018年北京建筑大学西城校区内21种乔木冠层的雨水截留和径流削减效益,推导计算径流削减量的校准方法,并结合相关性分析和回归分析探究城市林冠截留影响因素的作用规律。结果表明:近5年校区内乔木的年均截留体积1365.38m³,平均年截留率10.6%,年均径流削减量266.83m³,校准后较原结果平均增加14.5%;叶面积与年截留体积呈显著线性正相关关系;降雨因素在月尺度下对截留作用及其径流削减能力的影响更显著,月截留量与月降雨天数呈线性正相关关系;径流削减量在降雨较小时对林下不透水面占比更敏感。研究可为国内相关模型评估和城市提升绿地雨水消纳能力等提供参考。     

钻尖磨损形态

In this paper, we study the wear form of a conventional HSS W18Cr4V drill in drilling the quenched steel with middle hardness(HRC36-40).The drilling conditions and the optimization of the drill point are discussed.     

A Decision-Making Framework Model of Tool Selection for Green Manufacturing and Its Applications

Pursuing the green manufacturing of products is beneficial to the alleviation of environment burdens. In order to reap such benefits, green manufacturing is involved in every aspect of manufacturing processes.The optimization selection of tool is one of the important approach to improve environmentally performance of cutting machining. The objective factors of decision making problems for traditional tool selection are usually the following, quality and cost.Based on the main idea of environmentally conscious and decision making framework model of green manufacturing proposed by the authors, an multi object decision making model for tool selection is put forward. The objects includes Time(T),Quality (Q),Cost(C), Resources(R) and Environment impact(E), where T aims to minimize the produce time,Q means to maximize the quality,C means to minimize the cost, R means to minimize the consume the resources and E means to minimize the environment impact respectively. Each object is analyzed in detail and integrated the Fuzzy Clustering Analysis Algorithm together with the expert judging method apply to the model too. A case study in which a practical decision making problem for tool selection in green manufacturing machining is analyzed. Successful application of above model shows the model is practical .     

不同嫁接工具在番茄嫁接上的应用研究

通过不同嫁接工具在番茄嫁接上的应用研究,比较分析不同嫁接工具对嫁接速率、管理天数和嫁接成活率的影响,为番茄嫁接技术提供参考。结果表明:在3个不同处理中,密封型橡胶套管嫁接法和剖开型塑料套管嫁接法嫁接速率最高,均为120株/h,嫁接后管理天数最少,同为15 d;剖开型塑料套管嫁接法嫁接成活率最高,达95%;因此,番茄嫁接可优先选用剖开型塑料套管嫁接法。     

Genotypes and allele frequencies of buried SNPs in a bovine single‐nucleotide polymorphism array in Japanese Black cattle

Single nucleotide polymorphism (SNP) arrays are widely used for genetic and genomic analyses in cattle breeding; thus, data derived from SNP arrays have accumulated on a large scale nationwide. Commercial SNP arrays contain a considerable number of unassigned SNPs on the chromosome/position on the genome; these SNPs are excluded in subsequent analyses. Notably, the position‐unassigned SNPs, or “buried SNPs” include some of the markers associated with genetic disease. In this study, we identified the position of buried SNPs using the Basic Local Alignment Search Tool against the surrounding sequences and characterized the relationship between SNPs and genetic diseases in Online Mendelian Inheritance in Animals based on the genomic position. We determined the position of 285 buried SNPs on the genome and surveyed the genotype and allele frequencies of these SNPs in 5,955 individual Japanese Black cattle. Eleven SNPs associated with genetic disease, which contained five buried SNPs, were found in the population with the risk allele frequency ranging from 0.00008396 to 0.46. These results indicate that buried SNPs in the bovine SNP array can be utilized to identify associations with genetic disorders from large scale accumulated SNP genotype data in Japanese Black cattle.