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中学生百科 2013年第8期 62-64页

作者：堵媛媛

2012年6月,我被新加坡国立大学(National University of Singapore,以下简称nus)应用经济学专业录取,踏上了我在nus的留学生活。在进入nus之前,我曾误以为nus的学生都是那种怀里抱着厚厚的书本、讲话从不

关键词：新加坡英语图书馆阴恻恻 nus 课堂展示

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nus水泥砂浆在渡槽排架裂缝处理中的应用

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农田水利与小水电 1992年第3期 15-18页

作者：胡学良湖南省水利水电厅长沙市410014

由于有害离子侵蚀,混凝土碳化,钢筋锈蚀等方面原因,致使渡槽排架混凝土产生裂缝、剥落,严重危及着渡槽的安全运行。因此寻找一种科学、实用、简便的处理裂缝的方法,是当前渡槽老化损坏处理的一个重要课题。针对韶山灌区山枣渡槽排架裂... 详细信息

由于有害离子侵蚀,混凝土碳化,钢筋锈蚀等方面原因,致使渡槽排架混凝土产生裂缝、剥落,严重危及着渡槽的安全运行。因此寻找一种科学、实用、简便的处理裂缝的方法,是当前渡槽老化损坏处理的一个重要课题。针对韶山灌区山枣渡槽排架裂缝的处理实例,提出一种 nus 水泥砂浆处理渡槽排架裂缝的新方法。用该法处理后的渡槽排架,经运行观测,效果较好。

关键词： nus 水泥砂浆渡槽排架裂缝处理

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井下nus的零序功率选线算法的Simulink仿真

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工矿自动化 2009年第4期35卷 20-24页

作者：庄伟公茂法钱峰山东科技大学电气工程研究所山东青岛266510 山东交通学院科研处山东济南250031

文章使用Matlab的Simulink工具箱建立了井下nus单相接地故障的仿真模型,阐述了零序功率选线算法和带有补偿的零序功率选线算法的原理,介绍了基于零序功率选线算法的选线模型的仿真结构,并采用模拟选线装置运行机制的方式对2种选线算法... 详细信息

文章使用Matlab的Simulink工具箱建立了井下nus单相接地故障的仿真模型,阐述了零序功率选线算法和带有补偿的零序功率选线算法的原理,介绍了基于零序功率选线算法的选线模型的仿真结构,并采用模拟选线装置运行机制的方式对2种选线算法进行了仿真分析。仿真结果表明,零序功率选线算法的选线准确性高,抗干扰能力较强,对故障的反应速度较快,适合作为井下nus的单相接地故障选线算法。

关键词：煤矿井下 nus 单相接地故障零序功率选线算法 Simulink仿真

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The Cytological Studies on Neglected and Underutilized Cucurbit Species with Special Reference to Chayote,an Under-Exploited Species

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American Journal of Plant Sciences 2019年第8期10卷 1261-1279页

作者： Sergio G.Olvera-Vazquez Jorge Cadena-Iniguez Syed A.Gilani Kazuo N.Watanabe Tsukuba Plant Innovation Research Center University of TsukubaTsukubaJapan Colegio de Postgraduados Campus San Luis PotosiSalinas de HidalgoMexico Department of Biological Sciences and Chemestry University of NizwaNizwaSultanate of Oman

Cucurbitaceae family contains important economic and medical crops, they can be divided into two categories according to the worldwide consumption, use, and production. The Cucurbit Popular Crops (CuPoC) are comprised of cucumber, the Cucurbita group (pumpkin and squash), melon and watermelon. On the other hand, Neglected and Underutilized Cucurbit Species (NUCuS) group has been used as food sources, medicinal properties and elements in the elaboration of different types of items. The NUCuS is represented in this review work by bitter gourd, bottle gourd, chayote, ridge gourd, and snake gourd, which are recognized mainly in Asia. The center of origin of the majority of NUCuS was proposed to be in the Old World. In contrast, the origin of chayote or Sechiumedule (Jacq.) Sw. was suggested in the New World, precisely in Mesoamerican region based on linguistic uses and distribution of wild relatives. The environmental factors along with artificial selection, production systems and traditional knowledge have been influenced the evolutionary history of NUCuS, Infraspecific variation of chayote has been reported in Mexico over-described varietal groups. These descriptors were determined based on biochemical and morpho-structural traits;however, cytogenetic analyses are scarce. Specifically, chromosome and nuclear content analyses are important to support botanical groups, analyze artificial selection history, developing breeding and conservation programs. The present review paper discusses agronomic and evolutionary importance based on cytological evidence in NUCuS, mainly in the prominent chayote;with the perspective to prompt breeding, conservation, cytology, structural and functional genomics research for its sustainable utilization.

关键词： Chayote Sechiumedule nus Nuclear Content Chromosome Number Cucurbit Species

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