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Search Results: 1 - 10 of 9048 matches for " 牛彩云 "
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更新几何过程及相关性质
梁小林,彩云,田学
应用概率统计 , 2015,
Abstract: 基于系统分段退化的思想,本文提出了一类新的随机过程---更新几何过程.针对这一新的随机过程,给出了更新几何函数、拟更新几何年龄和拟剩余更新几何寿命的定义,并研究了它们的相关性质.最后,一个数值例子模拟了相关的理论结果.
龙井茶艺浅析
Analysis on the Artistry of Longjing Tea
 [PDF]

彩云
Hans Journal of Food and Nutrition Science (HJFNS) , 2016, DOI: 10.12677/HJFNS.2016.54023
Abstract:
对龙井茶艺的未尽完美之处进行了分析,提出通过茶水分离、适度润洗、小杯品饮等方式,使龙井茶艺更趋合理的建议。
The imperfectness of Longjing Tea Artistry is analysed. Some improvement measures were presented, e.g. separating the tea and infusion, rinsing the leaf surface, sipping the brew with a small teacup.
丙型肝炎病毒母婴传播的研究
贾文龙,孟宗达,建章,彩云,孙永德
中国公共卫生 , 1997,
Abstract: ?采用随访观察的研究方法,观察了13名感染HCV的母亲和她们生的15例婴儿的母婴传播HCV可能性、传播机率和后果。15例婴儿中,HCV感染率为86.7%,其中临床型1例(7.7%),亚临床型HC3例(23.1%),隐性感染9例(69.2%)。抗-HCV阳性率为﹕3月龄前为100.0%,6月龄开始有阴转,18月龄降至33.3%,到36个月龄时仍有1例阳性(16.7%)。HCVRNA检出率﹕9月龄前与抗-HCV相同,之后较高,18月龄后为66.7%,36月龄时为33.3%.婴儿感染HCV的临床类型与母亲怀孕时的病态有关,母亲孕期为临床型HC者,其婴儿易发展为临床型或亚临床型感染;HCVRNA和抗-HCV持续时间也相对长。HCV感染婴儿可能均为宫内感染,而非出生后所致。母亲及其婴儿血清标本HCVRNA基因型均为Ⅱ型。
塔里木河上游荒漠河岸林土壤水盐分布规律研究
Soil Water Salt Distribution Rule in Desert Riparian Forests in the Upstream of Tarim River

葛广华,彩云,王家强,柳维扬,补红英,建龙
- , 2016, DOI: 10.3969/j.issn.1001-7461.2016.06.02
Abstract: 对塔里木河上游荒漠河岸林不同覆盖度下土壤水盐分布规律的研究,为土壤盐渍化防治,干旱地区生态环境重建提供重要依据。通过对研究区不同植被覆盖度条件下(0~0.2,0.2~0.5与0.5以上)的盐渍化土壤进行分层取样,测定其盐分和水分含量,分析在水平方向和垂直方向上的水盐变化规律。结果表明:相同深度土壤盐分随覆盖度的增大呈现减少的趋势,相同土层以5月份盐分含量最高,4月最低;而土壤水分随覆盖度的增大呈增高的趋势,相同土层含水量随时间上没有明显的差异,含水量4月份稍高,6月稍低。在相同覆盖度条件下随着土层由浅到深盐分积累逐渐减少,表层0~60 cm 3个土层随时间推移盐分含量变化明显,其他土壤层次变化不大;而土壤水分与土层深度的关系不明显,随时间变化为4月份土壤含水量相对较多,6月份较低。在不同覆盖度不同土层盐分随水分含量变化规律为4月份覆盖度在0~0.2时,土壤盐分与含水量呈显著负相关,覆盖度在0.5以上时,土壤盐分与含水量呈极显著正相关,其他月份相关性不显著;因此,塔里木上游荒漠河岸林土壤水分、盐分的变化与覆盖度、季节有很大关系。
In order to provide theoretical basis for soil salinization control and reconstruction of ecological environment in arid area,the variation regularities of soil water and salt distribution under different vegetation coverages in the desert riparian forests in Tarim River upstream were investigated.Stratified sampling method was adopted in salinized soil with different vegetation coverage (0-0.2,0.2-0.5,0.5 or above).Contents of water and salts were measured to examine their variation regularities in horizontal and vertical directions.The results showed within the same soil depth,soil salt content increased with the decrease of vegetation coverage; in the same soil layer,the salt content was the lowest in April and highest in May; soil moisture increased with the increase of vegetation coverage; in the same soil layer,water content had no obvious difference with time,soil moisture was a little higher in April,a little low in June.Under the same coverage,the soil salt accumulation gradually reduced with soil depth; significant variations of soil salt content with time were observed in 3 layers within the depth of 0 to 60 cm ,while it was not significant for other soil depths; the relationship between soil moisture and soil depth was not significant,the moisture content in April was relatively high,and low in June.In April,significantly negative correlations were found between soil salt and water under the vegetation coverage of 0-0.2 and the correlation was the most significantly negative under the coverage over 0.5,and no significant correlations were found in other months.It was concluded that the soil moisture and salt variations were closely correlated with vegetation coverage and season in the area studied
不同矿化度咸水造墒灌溉对棉花生长发育和产量的影响
李科江,马俊永,彩云,郑春莲,张苍根,英洁
中国生态农业学报 , 2011,
Abstract: 采用裂区设计,灌溉量作为主处理,灌溉水的矿化度作为副处理,研究了播前不同灌溉量下不同矿化度咸水对棉花生长发育及产量的影响。研究结果表明,不同矿化度咸水灌溉对棉花出苗时间和出苗率的影响差异较大,随灌溉水矿化度的增大,棉花出苗速度变缓,出苗率降低,其中4g·L-1以下的咸水灌溉处理棉花出苗率在90%以上,6g·L-1矿化度处理平均出苗率仍可达85%左右,但出苗时间推迟。播种前咸水灌溉量以22.5~34.0mm为宜。灌溉水矿化度对棉花生长发育的影响程度前期大于后期,前期大于4g·L-1矿化度处理表现出明显的抑制生长作用,后期大于6g·L-1矿化度处理才表现出明显的抑制生长作用。从产量上看,棉花的咸水矿化度计算阈值为3.38g·L-1,即在矿化度小于3.38g·L-1时,咸水灌溉的棉花产量与淡水灌溉产量差异不明显,高于此矿化度阈值时,棉花产量呈直线下降趋势;但低于8g·L-1咸水灌溉的棉花产量均显著高于纯旱地的棉花产量。
保护性耕作对黄土高原玉米-小麦-大豆轮作系统产量及表层土壤碳管理指数的影响
杨晶,沈禹颖,南志标,高崇岳,伊宁,王先之,彩云,李光棣
草业学报 , 2010,
Abstract: 在陇东黄土高原雨养农业区,以传统耕作(t)为对照,研究了3种保护性耕作:耕作+秸秆覆盖(ts)、免耕(nt)、免耕+秸秆覆盖(nts)对玉米-大豆-小麦轮作系统产量和土壤全氮、全碳、有机碳,易氧化有机碳及碳库管理指数的影响。结果表明,从2001至2007年,10茬作物的总产量在ts、nts处理下分别比t提高3.63和1.62t/hm2,而nt处理则比t处理显著降低2.48t/hm2。7年后,t、ts、nt和nts处理表层土壤全氮含量分别提高15.4%,30.2%,16.2%和49.5%。总有机碳含量相应提高2.5%,18.7%,11.7%和74.0%,易氧化有机碳含量在ts,nt和nts处理下分别比t处理提高16.0%,16.2%和38.1%;土壤碳氮比在t、ts、nt和nts处理下较之7年前分别降低了11.41%,8.54%,3.91%和2.72%,ts、nt和nts处理下碳库管理指数分别比t处理提高12.6%,20.1%和46.6%,说明秸秆覆盖+免耕均有利于提高该轮作系统中土壤有机碳含量并改善碳库质量。
石油钻铤的疲劳寿命研究
Research on the Fatigue Life of the Oil Drill Collar
 [PDF]

彩云, 崔亚辉
Mechanical Engineering and Technology (MET) , 2014, DOI: 10.12677/MET.2014.34018
Abstract:
本文针对某钻铤在使用过程中发生疲劳断裂事故的实际问题进行了分析研究。在线性疲劳累计损伤理论的基础上,采用修正过的曼森–科芬方程对钻铤的疲劳寿命进行估算,进一步通过ANSYS Workbench有限元软件进行仿真分析。结果表明,仿真分析的危险截面与真实情况相符,且其得出的寿命与理论估算基本吻合,为工程设计提供参考。
The practical problem of a drill collar fatigue fracture accident occurring in the using process is studied. On the basis of the linear fatigue cumulative damage theory, the revised Manson-Coffin equation is used to estimate the fatigue life of drill collar. Further the finite element software ANSYS Workbench is applied to simulate the analysis. Comparing the results of the analysis, we can conclude that it can be applied in the practical engineering.
我国高校大学生创新创业能力培养问题研究
Research on the Cultivation of Innovative and Entrepreneurial Ability of Undergraduates in China
 [PDF]

于少强,彩云
Advances in Social Sciences (ASS) , 2016, DOI: 10.12677/ASS.2016.52043
Abstract:
我国正大力实施创新驱动战略,党和国家也一直高度重视大学生创新创业能力的培养和提升。2016年全国普通高校毕业生将达到765万人,高校作为国家人才培养的重要基地,对大学生创新创业能力的提升负有重要责任。因此,高校自身也应该积极改革,不断创新,肩负起创新创业教育的重任。本文分析了现阶段我国高校对大学生创新创业能力培养的现状与问题,介绍了国内外高校的相关经验,提出了适合于我国国情的高校大学生创新创业能力培养的对策建议。
With the expansion of universities’ enrollment, the number of undergraduates is increasing every year. The number of undergraduates will reach 7.65 million in 2016, which will lead to the problem of employment of undergraduates. In order to solve this problem, the state introduced the relevant policies to encourage students to start a business innovation. Universities, which are an important place to cultivate undergraduates, are directly related to the education of undergraduates’ innovation and entrepreneurial ability. Therefore, universities should reform actively and shoulder the responsibility of innovation and entrepreneurship education. This paper analyzes the current situation and problems of the cultivation of undergraduates’ innovative and entrepreneurial ability, at the same time, also introduces the cultivation of undergraduates’ entrepreneurial innovation ability in the United States and Sweden. Then it summarizes the measures and suggestions for the cultivation of undergraduates’ innovative and entrepreneurial ability.
高碘酸硝酸银六甲基四胺马休黄染色改良法
彩云
第三军医大学学报 , 2005,
Abstract:
好字当头质量第一——一冶召开专职技术监督人员会议
彩云
工业建筑 , 1965, DOI: 10.13204/j.gyjz196508014
Abstract: 第一冶金建建公司针对在生产建设高潮中,如何坚持质量第一,把住质量关,全面贯彻多快好省的方针等问题,召开了专职技术监督人员会议。公司副经理在会上作了重要讲话,他分析了今年前几个月的工程质量情况后,着重指出工程质量问
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