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Search Results: 1 - 10 of 62488 matches for " 魏峰 "
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油料作物和粮食作物种子中有机氯农药残留分析

土壤 , 2008,
Abstract: 为了调查作物种子中有机氯残留的现状和种子脂质含量与种子中有机氯残留的关系,本文通过gc-ecd对某农产品基地的油料作物花生、大豆、芝麻和粮食作物水稻、小麦、玉米种子中有机氯农药残留进行了分析。结果表明,对照who/fao标准,6种作物种子中的滴滴涕(ddt)和六六六(hch)残留均不超标;总ddt的残留范围是3.8~10.3ng/g,残留顺序是花生>芝麻>大豆>玉米>小麦>水稻;总hch的残留范围是4.3~10.7ng/g,残留顺序是花生>玉米>芝麻>大豆>小麦>水稻。3种油料作物种子中的总ddt残留浓度显著高于3种粮食作物种子中的残留浓度,种子中的总ddt残留浓度与种子脂质含量的对数显著正相关。
基于ANSYS的水闸闸室结构有限元分析
The Finite Element Analysis for Sluice Chamber Structure Based on ANSYS
 [PDF]

, 廖锡健
Hans Journal of Civil Engineering (HJCE) , 2014, DOI: 10.12677/HJCE.2014.33007
Abstract:

为了完成闸室底板配筋设计,采用ANSYS对梅山水道南堤水闸闸室各工况进行三维模型的有限元分析,计算闸室结构应力,进而选取应力最大值进行配筋计算,配筋率计算值低于规范值。研究表明,基于ANSYS对闸室结构进行有限元分析能够计算复杂受力的水闸闸室结构各部位应力,为配筋提供依据,对其设计及优化具有指导意义。
In order to complete the reinforcement design of lock chamber floor, we use 3D finite element analysis of the southern dike lock chamber in Meishan waterway under each working condition by using the ANSYS, calculate the lock chamber structure stress, and then select the maximum stress for reinforcement calculation. The calculated value of reinforcement ratio is lower than the standard value. Study shows that the lock chamber structure based on ANSYS finite element analysis can calculate each part of the complex stressing sluice chamber structure’s stress, providing the basis for reinforcement; that has guiding significance for its design and optimization.

国际典型地区美丽乡村建设经验分析及启示
Research about the Experiences and Strategies of Beautiful Country in Typical Regions of the World
 [PDF]

依林, 邵超
Sustainable Development (SD) , 2016, DOI: 10.12677/SD.2016.63024
Abstract:
自十六届五中全会上首次提出“美丽乡村”的发展目标以来,我国迎来了以浙江省安吉县为代表的美丽乡村建设热潮,局部地区农村得到了突破性发展。论文讨论了日本、韩国、中国台湾、德国、荷兰等国际典型地区美丽乡村建设现状、基本做法和典型经验,以期更好的指导当前我国美丽乡村的建设。
The development goal of “beautiful country” proposed for the first time since the Fifth Plenary Session of the 16th CPC Central Committee, China ushered in Anji County, Zhejiang Province, as the representative of the beautiful country construction upsurge, local rural areas have been a breakthrough. This paper discusses the status of the construction of the beautiful country in Japan, South Korea, Chinese Taipei, Germany, Holland and other international typical areas, the basic practice and typical experience, in order to better guide the construction of the beautiful country of China.
货运列车车底物质检测与识别系统的研究设计
永胜,白云
煤炭工程 , 2015, DOI: 10.11799/ce201502037
Abstract: 介绍了神华集团神东矿区商品煤在装车前采用激光扫描技术进行车底残留物体体积检测;利用可见光摄像头,拍摄车底物质视频,根据物体纹理、颜色判别物质种类;同时,利用摄像头拍摄火车侧面视频,进行火车车号识别。通过这三种技术方法,完成每一节车箱底部残留物质体积计算与物质识别,提高煤炭等物料的装车效率。
加快吉林电网发展的若干思考

电网技术 , 2006,
Abstract: 通过对吉林电网现状的分析,指出了电网存在的主要问题,根据电源规划和负荷预测的结果,提出了吉林电网“十一五”发展的指导思想,明确了电网的发展目标,阐述了吉林省500kV电网、220kV电网、重点城市电网、城乡电网和电网二次系统的发展思路以及加大使用高新技术的力度、提高电网科技含量的建议,最后探讨了在吉林电网发展过程中需要注意的若干问题。
ddt引发的争论及启示
,董元华?
土壤 , 2011,
Abstract: 本文沿着ddt从1874年合成到将在2020年淘汰的轨迹和趋势,第一次依据历史重大事件并结合sci文献数量将ddt的发展分为4个历史阶段,着重探讨了这种“万能杀虫剂”带来的3个争论:ddt对人类的健康影响、禁用还是使用ddt、以及如何评价ddt。本文从ddt由人类的“宠儿”变成“弃儿”的历史演变中分析得出了一些启示,并指出对当今社会的警示意义。
海拔及工艺差异对葡萄酒中香气及酚类物质的影响

- , 2017, DOI: 10.13982/j.mfst.1673-9078.2017.12.029
Abstract: 采用搅拌棒固相萃取结合气质联用分析香格里拉6种海拔及2种工艺的葡萄酒香气及酚类。结果表明:随海拔升高,葡萄酒中残糖含量下降但差异不显著;500 m海拔落差范围内,总酚、总类黄酮、总花色苷含量分别升高约300 mg/L、700 mg/L和100 mg/L,总黄烷醇及总单宁含量呈略有下降;单体酚总量、儿茶素、槲皮素(3~20 mg/L)及多数单体花色苷(1~15 mg/L)均呈现不同程度的上升;最高海拔酒样香气总量、醛酮及萜烯类含量显著高于其他海拔,酯类物质含量显著高于最低海拔。西当-A总黄烷醇、总花色苷、总单宁含量略高于西当-B,酯类(61.45%)和醛酮及萜烯类(0.59%)百分比显著高于其他酒样,花色苷总量比西当-B高约10~17 mg/L;而西当-B-X总酚、总单宁、酯类及醛酮和萜烯类含量均高于西当-B-Y。高海拔有利于提高酒的颜色稳定性和特征香气含量,西当-A品质略好于西当-B,而工艺X略优于工艺Y。
Using the stir bar solid phase extraction coupled with gas chromatography-mass spectrometry, the aromas and phenols inwines of 6 different cultivation altitudes and 2 brewing processes from Shangri-La area were analyzed. The results showed that the content of residual sugar in wine decreased with the increase of altitude, but the difference was not significant. Within 500 meters of the altitude range, the contents of total phenols, total flavonoids and total anthocyanins increased about 300 mg/L, 700 mg/L and 100 mg/L, respectively, while contents of total tannin and flavanols showed a slight downward trend with the increase of altitude. The total amount of monophenols, catechin, quercetin (3~20 mg/L) and most of the monomer anthocyanins (1-15 mg/L) showed varying degrees of increase. The contents of aldehydes, ketones and total aroma substances in wine from the highest altitude were significantly higher than those in wine from other altitudes. Esters content in the wine from the highest altitude was significantly lower than that in wine sample from the lowest altitude. The percentages of total flavanols, total anthocyanins and total tannin in Xidang-A sample were higher than those in Xidang-B. Percentages of esters (61.45%), aldehyde ketone and terpenes (0.59%) in Xidang-A sample were significantly higher than those in other samples. Content of total anthocyanins of Xidang-A was also about 10~17 mg/L higher than that in Xidang-B. The contents of total phenols, total tannins, esters, aldehyde ketone and terpenes in Xidang-B-X were higher than those in the Xidang-B-Y. Higher altitude was beneficial to improve the color stability of wine and the characteristics of aroma content. Quality of Xidang-A was better than that of Xidang-B, and the brewing process of X was better than that of Y.
双流体循环系统蒸发过程中“节点”特性及局部换热强化的研究
保太,,
工程热物理学报 , 1989,
Abstract:
页岩不同类型孔隙的含气性差异——以四川盆地焦石坝地区五峰组—龙马溪组为例
志红,
天然气工业 , 2014,
Abstract: ?作为中国第一个具备商业性开发价值的大型整装页岩气田,四川盆地涪陵焦石坝页岩气田的发现,极大地推动了中国页岩气产业的发展。为此,以该页岩气田上奥陶统五峰组—下志留统龙马溪组页岩为研究对象,利用氩离子抛光扫描电镜、tra等实验分析数据,在对该区页岩孔隙类型和特征进行研究的基础上,重点对不同类型孔隙的含气性差异进行了探讨。结果表明:页岩的孔隙包含了有机质孔、黏土矿物间孔以及脆性矿物孔(晶间孔、次生溶蚀孔等)等孔隙类型,以有机质孔和黏土矿物间孔为主,占总孔隙比例的90%左右。有机质孔隙是页岩气最重要的储集空间,高有机碳含量与高孔隙度、高有效含气饱和度呈良好的耦合关系,表明有机质孔隙含气性好;黏土矿物间孔隙由于具有亲水性,表现出黏土矿物含量与含水饱和度呈明显的正相关关系,其含气性较差。这些成果为该区域页岩气勘探提供了技术支撑,也可供类似区域借鉴。
煤矿井下火灾的自动探测与灭火技术方案的研究
Research on the Automatic Fire Detection and Fire Suppression Technique Scheme in the Coal Mine
 [PDF]

高彦, 田昊, 窦昊, 冯懋, 王少, 苗苗, 徐攀
Journal of Electrical Engineering (JEE) , 2014, DOI: 10.12677/JEE.2014.23006
Abstract:
介绍了以基于拉曼散射的分布式光纤温度传感器对煤矿井下火灾进行自动探测的设计,分析了分布式光纤应用于煤矿井下的可行性和优越性,并结合水喷雾技术,共同构成煤矿井下火灾的自动探测及灭火系统。在发生非电气类火灾时,可以用其进行灭火,在平时可以用其对井下进行洒水除尘处理,实现资源的最大化利用。
This paper introduced the distributed optical fiber temperature sensor based on Raman scattering for design of automatic fire detection in the underground coal mine. Feasibility and superiority of the distributed optical fiber applied in coal mine was analyzed. Combined with water spray technology, the distributed optical fiber constituted the automatic fire detection and fire extin-guishing system in the underground coal mine. In the event of non-electrical fire, it can be used to put out the fire, and be usually used for underground sprinkling service, which maximizes the use of resources.
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