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Search Results: 1 - 10 of 268492 matches for " 张瑞 "
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一类分数阶导数微分方程的隐式差分解法
An Implicit Finite Difference Scheme for Space-Time Fractional Partial Differential Equation
 [PDF]

,
Operations Research and Fuzziology (ORF) , 2013, DOI: 10.12677/ORF.2013.32002
Abstract:
分数阶导数微分方程作为通常微分方程的推广,被广泛地应用于工程,物理,信息处理,金融,水文等领域。本文给出了数值求解一类时间空间分数阶导数的双边空间微分方程的一种隐式差分格式,并对其稳定性和收敛性进行了理论分析,证明了格式的无条件稳定性并给出了收敛阶估计。
Fractional order differential equations are generalizations of classical differential equations. They are widely used in the fields of diffusive transport, finance, nonlinear dynamics, signal processing and others. In this paper, an implicit finite difference method for a class of initial-boundary value space-time fractional two-sided space partial differential equations with variable coefficients on a finite domain is established. The stability and convergence order are analyzed for the resulted implicit scheme. With mathematical induction skills, the scheme is proved to be unconditionally stable and convergent.
略谈中药炮制现代化的途径

中国中药杂志 , 1984,
Abstract: <正>中药炮制是我国人民长期与疾病作斗争的经验总结。早在《黄帝内经》中的半夏秫米汤中就有“治半夏”的规定,“治半夏”即炮制过的半夏。汉代《神农本草经》中说:“药有……有毒无毒,阴干暴干,采造时月,生熟、土地所出,真伪陈新,并各有法”,“若有毒宜制,可用相畏相杀者”。南北朝刘宋时代,雷敩总结了历代及当时炮制法则,论著了我国第一部炮制专书《炮炙论》。唐《备急千金要方》将炮制问题列为专章讨论。明陈嘉谟著《本草蒙荃》,对炮
基于协作多点的干扰协调技术

南京邮电大学学报(自然科学版) , 2010,
Abstract: 协作多点干扰协调技术是第四代移动通信中的关键技术,本文对此进行了全面回顾。内容主要分为三个方面:基站联合传输/预编码、基站协作调度和基站联合检测/解码。基站协作传输主要表现在基站协作设计合适的预编码向量/矩阵,降低/避免用户间的干扰;基站协作调度表现在通过按照某种准则选择用户子集与基站通信,在系统吞吐量和通信公平性之间做出折衷;基站联合检测/解码是通过基站间的协作对多个用户的信号进行译码。
吉林省夏季中期关键性天气的综合分析

气象 , 1988, DOI: 10.7519/j.issn.1000-0526.1988.06.008
Abstract:
经皮椎体成型术中骨水泥外渗的预防方法

南方医科大学学报 , 2010,
Abstract:
鹰嘴豆膳食纤维对高脂血症大鼠脂代谢的改善作用

- , 2018, DOI: 10.13982/j.mfst.1673-9078.2018.10.003
Abstract: 本研究观察了鹰嘴豆膳食纤维对高脂血症大鼠血脂及抗氧化水平的影响,为鹰嘴豆保健功效研究提供参考依据。40只雄性SD大鼠高脂饲料喂养建立高脂血症模型,将造模成功的大鼠,随机分为高脂模型组,鹰嘴豆膳食纤维高(30 g/kg高脂饲料)、中(15 g/kg高脂饲料)、低(5 g/kg高脂饲料)3个干预组。高脂模型组继续喂以高脂饲料,干预组分别喂以含不同含量鹰嘴豆膳食纤维的高脂饲料。干预7周后,处理动物,分别测定各组大鼠体重、肝重、附睾周脂重,血清血脂水平及氧化应激水平。结果表明:与高脂模型组相比,鹰嘴豆膳食纤维组体重增量、肝重、附睾周脂重均有下降,其中体重增量以干预第5周高剂量组下降最为明显,降低:29.34%,高中低各剂量组附睾周脂重分别降低:33.81%,17.28%,21.86%,但肝重降低无统计学差异;血脂方面,甘油三酯(TG)、低密度脂蛋白(LDL-C)值高剂量组降低:51.52%,40.45%,总胆固醇(TC)值以中剂量组最优,降低:34.31%,高密度脂蛋白(HDL-C)高剂量组升高42%;在抗氧化能力方面,中剂量组丙二醛(MDA)含量降低40%,高剂量组总超氧化物歧化酶(T-SOD)、谷胱甘肽过氧化物酶(GSH-Px)水平分别升高54%,55%,且T-SOD、GSH-Px升高呈现剂量相关性。可见鹰嘴豆膳食纤维具有降低高脂血症大鼠体质量,调节异常血脂作用,而这种作用可能与其提高高脂血症大鼠抗氧化能力,降低氧化应激损伤有关。
In this study, the effects of chickpea dietary fiber on blood lipid and antioxidant levels of hyperlipidemic rats were observed to provide a reference for the research of the health benefits of chickpeas. Forty male SD rats were fed with high-fat diet to establish hyperlipidemia model. Then the hyperlipidemia model of rats were randomly divided into hyperlipidemia model group, high chickpea fiber (30 g/kg high-fat diet), middle chickpea fiber (15 g/kg high-fat diet), and low chickpea fiber (5 g/kg high-fat diet) three intervention groups. The hyperlipidemia model group was fed with high-fat diet, and intervention groups were given high-fat diet containing different levels of chickpea dietary fiber. After 7 weeks of intervention, the animals were executed. The body weight, liver weight, epididymal fat weight, serum lipid levels and oxidative stress levels of rats were measured in each group. The results showed that: The weight gain, liver weight and epididymal lipid weight were decreased in chickpea dietary fiber group, compared with the hyperlipidemia model group. After five weeks the body weight was obviously decreased by 29.34%, the epididymal fat weight decreased 33.81%, 17.28% and 21.86% in the high, medium and low dose groups, respectively, but there was no significant difference in liver weight. In terms of blood lipids, triglyceride (TG) and low density lipoprotein (LDL-C) in high-dose group decreased by 51.52% and 40.45%, respectively. The total cholesterol (TC) value was optimal in the middle dose group, which was reduced by 34.31%. High density lipoprotein (HDL-C) in high-dose group increased by 42%. In terms of antioxidant capacity, the malondialdehyde (MDA) content in the middle-dose group was reduced by 40%, the total superoxide dismutase (T-SOD) and glutathione peroxidase (GSH-Px) levels in the high-dose group were increased by 54% and 55%, respectively, the increases of T-SOD and GSH-Px levels were dose-dependent. It
我国制造业创新型企业上市公司经营绩效分析
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天津大学学报(社会科学版) , 2013,
Abstract: ?通过对制造业创新型企业上市公司与非创新型企业上市公司在一系列财务指标上的对比分析,得出除了营业成本率、销售净利率和存货周转率外,两者在财务特征上并没有显著差别,并且通过dea的方法对我国制造业创新型企业的经营绩效进行分析,得出我国制造业创新型企业上市公司经营效率多数无效。按照净资产收益率的大小将创新型企业上市公司分为高收益组和低收益组两组,对制造业创新型企业上市公司进行内部分析。
根管治疗后疾病中粪肠球菌的致病性和检测及清除
Pathogenicity, detection, and elimination of Enterococcus faecalis in post-treatment endodontic disease

,孙克勤
- , 2015, DOI: 10.7518/gjkq.2015.03.026
Abstract: 摘要:
粪肠球菌是根管治疗后疾病最常见的细菌,在再感染根管内的检出率为24%~77%。粪肠球菌的致病性与其形成的生物膜高度相关,而其耐药性也与其致病性密不可分,是引发根管内慢性感染的关键。粪肠球菌的检测以细菌培养和聚合酶链反应(PCR)为主,而PCR用于检测感染根管内粪肠球菌较细菌培养更为敏感。根管治疗后疾病中粪肠球菌的清除方法多种多样,结果各不相同。有研究显示抑菌率,质量分数2%的氯己定为100%,10%的盐酸氯丙嗪为88.8%,4%的利多卡因凝胶为76.4%和5%的盐酸阿米洛利为71.4%;有研究则显示,混合物-四环素-异构体-酸-去污剂、QMiX和次氯酸钠皆较2%氯己定更有效。还有研究显示,铒:钇-铝石榴石激光对粪肠球菌生物膜有清除作用。
Abstract:
中图分类号
76例乳腺肿瘤超声图像预处理研究
The Research on Preprocessing for the Gray-Scale Ultrasound Breast Tumor Images of 76 Cases
 [PDF]

, 刘晴, 刘奇
Hans Journal of Biomedicine (HJBM) , 2015, DOI: 10.12677/HJBM.2015.52002
Abstract:
以76例乳腺肿瘤灰阶超声图像为研究对象,根据医学超声图像的特点及P-M模型的缺点,提出以图像的局部信息确定扩散门限的改进的P-M模型滤波方法,通过采用多种图像预处理算法及上述改进的P-M模型滤波法对76例乳腺肿瘤超声图像进行试验,实验结果显示,改进的P-M模型滤波方法可以更有效的滤除斑点噪声。
This paper mainly focuses on the gray-scale ultrasound breast tumor images. According to the characteristics of ultrasonic image and shortcomings of the P-M model, a modified P-M model filter with local information and spread threshold is proposed. All common pretreatment algorithms are put into experiments and a comparison is made among them. The results show that the modified P-M model filter can more effectively remove the speckle noise.
管外封隔器组合注入工具研制
The Design of Combined Injection Tool for External Casing Packer
 [PDF]

王继飞,
Mine Engineering (ME) , 2015, DOI: 10.12677/ME.2015.34024
Abstract:
目前,在完井作业尤其是水平井的分段完井或分段卡封中,现有管外封隔器的坐封工艺不能保证坐封良好,因此本文设计了一种管外封隔器组合注入工具,利用其上、下两端的胶筒实现密封,中间的注入孔道实现对管外封隔器胀封液的注入,可实现管外封隔器的有效坐封,注入水泥则可实现其永久坐封,提高分段完井或分段卡封工艺的有效期。通过现场应用表明,该工具可靠有效,能够适应分段完井或分段卡封工艺的长期有效应用。
Now, in the completion operation, especially in the staged completion and staged plugging, the seating process can’t promise successful sealing. So the combined injection tool for external casing packer is designed. The top and bottom packers are used for sealing; the middle hole is applied to inject fluid for seating packer. If the fluid is cement, ECP (external casing packer) is seating for permanent. The validity of segmental completion and segmental plugging is longer. Through the field application, the tool is reliable and effective in segmental completion and segmental plugging technology.
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