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Search Results: 1 - 10 of 250576 matches for " 张莎莎 "
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一类涉及例外函数的正规定则
Normal Families Concerning Exceptional Functions
 [PDF]

, 凌才原
Pure Mathematics (PM) , 2014, DOI: 10.12677/PM.2014.44018
Abstract:

本文讨论亚纯函数族的正规性,在亚纯函数的零点和极点重级满足一定的限制条件下,证明了一类涉及的例外函数的亚纯函数族正规定则,推广了之前涉及\"\"例外值的正规定则。
In this paper, we discussed the normality of families of meromorphic functions with restricted conditions on the multiplicity of their zeros and poles, and proved a normal criterion related to the exceptional function of \"\"which generalized the earlier results related to the exceptional values.

我国荧光灯的废弃处置研究分析
The Analysis of Spent Fluorescent Lamps for Disposal in China
 [PDF]

嘉兴,
Sustainable Development (SD) , 2016, DOI: 10.12677/SD.2016.62014
Abstract:
我国是世界上荧光灯生产和使用大国,废弃荧光灯的污染问题也越来越严重。本文分析了我国荧光灯的生产现状,废弃荧光灯研究进展,又对废弃荧光灯中的汞做了物质流分析。结果表明我国对废弃荧光灯的处置研究较少,尤其是在技术方面更是如此。据估算,2011年大概有15.04吨的汞流向了土壤中,0.63吨释放到了空气中,造成了巨大的环境污染。我们应该立即采取行动,从生产、消费和回收方面多管齐下,达到环境保护和资源节约的多项效益。
China is one of the largest consumers and producers of fluorescent lamps in the world and has been facing a growing concern of mercury pollution. This study investigated conditions of production for fluorescent lamps, the previous research about spent fluorescent lamps and the mercury flow of fluorescent lamps in Mainland China using material flow analysis (MFA). The results indicated that there were not enough researches about spent fluorescent lamps, especially about the aspects of technology. The total amount of mercury emissions to the land and atmosphere was 15.04 and 0.63 tons in 2011, respectively. It is urgent to take actions associated with manufacturing, use and recycling to protect environment and save the resources.
表面活性剂——超声提取莲子心总生物碱工艺研究
Surfactant—Mediated Ultrasonic-Assisted Extraction of Total Alkaloids of Plumula Nelumbinis
 [PDF]

罗平, 孙俊杰,,
Hans Journal of Medicinal Chemistry (HJMCe) , 2014, DOI: 10.12677/HJMCe.2014.23004
Abstract:
对超声辅助乙醇提取莲子心总生物碱的工艺进行了研究。考察超声功率、超声时间、浸泡时间、乙醇体积分数、料液比对生物碱提取率的影响,在此基础上用正交试验进行条件优化。并在优化的工艺条件下,考察吐温20、吐温60、吐温80、司盘80、APG0810、APG1214表面活性剂对提取率的影响。结果表明,在超声功率105 W、超声时间40 min、浸泡时间30 min、乙醇体积分数70%、料液比1:30、APG08103加入量0.02 g/mL的条件下,生物碱提取率为157.268 mg/g,比单纯超声提取(138.231 mg/g)提高13.8%,证明表面活性剂可显著提高超声提取莲子心生物碱的效果。
Ultrasonic assisted ethanol extraction of alkaloids from Plumula Nelumbinis was studied. The ef-fects of ultrasonic power, ultrasonic time, immersion time, ethanol volume fraction and solid-liq- uid ratio on the extraction rate of alkaloids were investigated by single factor experiment, and the extraction parameters were optimized by orthogonal test. Under the best conditions, the influence of surfactants of Tween20, Tween60, Tween80, Span80, APG0810 and APG1214 on the extraction rate of alkaloids were illustrated. The results showed that under the best conditions of ultrasonic power 105 W, ultrasonic time 40 min, immersion time 30 min, ethanol volume fraction 70% and solid-liquid ratio 1:30, the extraction rate of alkaloids was 138.231 mg/g. By adding APG0810 0.02 g/mL, the extraction rate of alkaloids could be improved by 13.8% to 157.268 mg/g, which indi-cated that surfactant could improve the effect of ultrasonic extraction of alkaloids from Plumula Nelumbinis markedly.





尖喙牻牛儿苗繁殖体外部形态特征
,元明**
生态学杂志 , 2010,
Abstract: ?尖喙牻牛儿苗(erodiumoxyrrhynchum)是古尔班通古特沙漠短命植物层片优势物种,其繁殖体能够在生物结皮上成功定居,借助扫描电镜等方法对其繁殖体形态进行了观察。结果表明:尖喙牻牛儿苗繁殖体表皮附属毛具4种不同类型,在保持水分和固定繁殖体等方面发挥作用,是对散布和定居的一种适应;果实与芒连结部位存在过渡区和分裂缝隙;芒吸湿后与种子长轴夹角逐渐减小,表皮细胞发生形变,是吸湿运动的形态基础,这种形态变化可以促使繁殖体在地面“行走”,遇到适宜的生境时,推动种子钻入土壤而定居。本研究为揭示该种定居适应机制提供了形态学依据。
2型糖尿病患者下肢动脉疾病与体脂及骨密度的相关性分析
,雅静,
天津医药 , 2013,
Abstract: ?【】目的探讨2型糖尿病(t2dm)患者下肢动脉疾病程度与体脂含量及骨密度(bmd)的相关性。方法319例t2dm患者根据双下肢各动脉最大狭窄值,将其分为无狭窄组、轻度狭窄组、中度狭窄组及重度狭窄组4组,检测并比较各组不同部位体脂百分比、腰椎(l2~4)和左股骨bmd及相关代谢指标,分析其与下肢动脉疾病的相关性。结果随着狭窄严重程度增加,脊柱脂肪百分比(sf%)升高,左股骨bmd下降;中、重度狭窄组全身体脂百分比(bf%)高于轻度狭窄组、无狭窄组,重度狭窄组左侧股骨脂肪百分比(lf%)高于无狭窄组,中、重度狭窄组l2~4bmd低于轻度狭窄组、无狭窄组。中、重度狭窄组病程、体质指数(bmi)、三酰甘油(tg)、糖化血红蛋白(hba1c)、收缩压(sbp)高于轻度狭窄组、无狭窄组,中、重度狭窄组总胆固醇(tc)、低密度脂蛋白胆固醇(ldl-c)高于无狭窄组,重度狭窄组血钙高于轻度狭窄组、无狭窄组,中、重度狭窄组高密度脂蛋白胆固醇(hdl-c)低于轻度狭窄组。下肢动脉疾病与sf%、hba1c、tc、病程、bf%、sbp呈正相关,与左股骨bmd、l2~4bmd呈负相关(p<0.05)。且sf%、hba1c、tc升高,左股骨bmd下降为患者发生糖尿病下肢病变的危险因素。结论腹型肥胖及下肢bmd降低与t2dm患者合并下肢动脉疾病密切相关。
利用网络进行研究生招生宣传的策略研究
Strategy Research on the Publicity of Graduate Admissions via Internets
 [PDF]

李海, 侯舒娟,, 陈刚,
Service Science and Management (SSEM) , 2016, DOI: 10.12677/SSEM.2016.54B002
Abstract:

利用网络进行研究生招生宣传已经日益引起高校的重视,但是也存在着招生定位不明确、信息更新不及时,以及传播效果差等诸多问题。本文通过对研究生招生宣传的特点进行分析,并对目前常用的各种网络宣传手段进行了归纳和比较,提出了以导师或导师团队为核心的宣传模式,通过合理定位和选择恰当的宣传方式确保宣传的针对性和效率。

The publicity of graduate admissions via Internets has increasingly attracted the attention of col-leges, but many problems also exist, such as unclear positioning of the publicity, the out-of-date information, and the lower than expected dissemination results. This paper analyses the charac-teristics of graduate admissions and summarizes and compares the currently used a variety of publicity methods via Internets. A promotional model with tutors or tutors team as the core is presented in this paper. Some suggestions about proper positioning and selecting the appropriate method to ensure the pertinence and efficiency of publicity are also discussed.
对一起欺诈发行股票案的反思
俊民(教授),
财会月刊 , 2005,
Abstract: 山东巨力公司欺诈发行股票案件再一次暴露出我国企业在内部会计控制及其监管上的诸多不足。本文在分析山东巨力公司欺诈发行股票所暴露出的内部会计控制及其监管问题的基础上,分析研究美国安然事件后企业在内部会计控制及其监管方面所采取的新举措及其对我们的启示,进而探讨完善、强化我国企业内部会计控制及其监管的相关问题,并提出几点政策建议。  【关键词】欺诈发行股票案例分析内部会计控制监管机制政策建议一、案件简况  2005年3月25日,山东省潍坊市奎文区人民法院以欺诈发行股票罪,判处山东巨力股份公司(简称“巨力公司”)罚金160万元;公司原董事长、法定代表人王清华被判处有期徒刑两年缓刑三年;公司原财务处副处长张传胜被判处有期徒刑一年缓刑两年。这是国内首例上市公司及其高层管理人员(简称“高管”)因欺诈配股而被追究刑事责任的案件。经潍坊市奎文区人民法院审理查明,1999年4月至2001年2月,王清华为使公司通过配股达到募集资金的目的,在公司不具备配股条件的情况下,安排财务处副处长张传胜编造虚假会计材料以达到配股要求的条件。张传胜采取原材料少列生产成本、多转在建工程成本、原材料少转生产成本、在产品少转产品成本和将管理费用及财务费用在其母公司山东巨力集团列支的方式,虚增1999年度利润161457361.06元。2000年,王清华安排利用上述虚假的会计材料,编制配股申请材料,并在配股说明书中编造虚假内容,骗取了配股资格,于2001年2月在深圳证券交易所实施配股融资。
粗粒盐渍土大型冻融循环剪切试验
,杨晓华
长安大学学报(自然科学版) , 2012,
Abstract: 针对冻融循环后粗粒盐渍土的强度将直接影响盐渍土地区路堤的稳定性,而采用常规剪切试验将导致粗粒盐渍土的颗粒效应问题,基于西北地区粗粒盐渍土的冻融特点和剪切试验原理,设计研发了将冻融循环试验和剪切试验结合的大型粗粒土冻融循环剪切试验装置,可有效测试在不同温度条件下材料的强度特性。依托某公路盐渍土试验段项目,采用天然粗粒盐渍土模拟下路堤,测试其在经过冻融循环后的强度变化特点,并利用测试数据进行实际工况的数值计算。结果表明随着冻融循环次数的增加,靠近冷端土体的粘聚力逐渐增大,内摩擦角先减小后增大;靠近暖端的土体强度逐渐减小,9次冻融循环后,靠近暖端的土体内摩擦角有一定增大;采用该天然粗粒盐渍土填筑的下路堤的强度变化量较小,路堤强度基本稳定。
A字裙造型与面料性能的关系
吴巧英,
纺织学报 , 2013,
Abstract: 为研究A字裙造型与面料性能之间的量化关系,选用15种常见面料,测试了面料的常见物理力学性能,并用同一样板制作A字裙,用数码相机对A字裙从不同角度进行拍照,然后用Photoshop进行图像处理,提取A字裙不同方向像素面积、裙宽、裙厚、波浪个数等造型参数指标,最后用相关分析和回归分析进行数据处理。研究结果表明:影响A字裙造型客观的面料性能有弯曲刚度、拉伸率、面密度及悬垂性;裙厚及侧面面积与面密度呈正相关;45°侧面面积与纬向抗弯刚度正相关;面料越不易拉伸的面料制成的A字裙越易呈现下摆向两侧张开的A型效果;硬挺、悬垂性差的面料制成的A字裙波浪数较少。
随机仿射变分不等式的改进期望加权残差法
Improved method of weighted expected residual for solving stochastic variational inequality problems

,寇喜鹏
- , 2017,
Abstract: 文章在绝对值残差和加权期望残差方法的基础上,针对带有非线性扰动的随机仿射变分不等式问题考虑期望和方差的凸组合形式,得到了改进的期望加权残差极小化问题.通过拟蒙特卡洛方法得到了问题的离散近似问题,研究了问题目标函数的可微性及其水平集的有界性,最后对问题进行了收敛性分析。
This paper is concerned in constructing a new deterministic model for the stochastic affine variational inequality problems with nonlinear perturbation based on the least absolute deviation method and weighted expected residual minimization method. By means of Quasi-Monte Carlo method, we obtain a discrete approximation of the problem. Some properties of the problem are studied under suitable conditions. The convergence of optimal solutions and stationary points of the approximation problem are also analyzed
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