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Search Results: 1 - 10 of 69419 matches for " 石红 "
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一种基于粗糙集的离散化算法*

模式识别与人工智能 , 2006,
Abstract: 粗糙集理论以其独特的数据约简能力在不确定信息处理的相关领域得到广泛关注和研究,而连续属性的离散化是粗糙集方法及其它归纳学习系统中的重要环节.将离散化视作一种信息概括、抽象和约简,利用粗糙集理论提出一种全局的离散化算法.算法通过定义一致性度量,实现全局离散,弥补了局部离散化MDLP方法引入不一致的缺陷.然后在保持一致性前提下,进一步对离散中分割点的冗余进行约简.实验采用ID3和粗糙集分类工具ROSETTA在多个大数据集上对提出的离散方法进行分类验证,实验结果表明该算法的有效性和优越性.
近55a巴里坤降水量与蒸发量变化
Precipitation and Evaporation Change in the Balikun over Last 55 Years
 [PDF]

卓世新, 冯桂,
Climate Change Research Letters (CCRL) , 2016, DOI: 10.12677/CCRL.2016.52011
Abstract:
为了研究哈密北部巴里坤哈萨克自治县一带的水分循环变化特征,利用巴里坤国家气象站1961~2015年降水量和蒸发量观测资料,采用线性回归、距平百分率、Mann-Kendall突变检验方法以及干燥度指数,对巴里坤降水量、蒸发量和干燥度进行了分析。结果表明:巴里坤年、季降水量和蒸发量年际变化明显;近55a年、季降水量呈增加趋势,其中年、春、夏、秋季的降水量增加趋势明显,冬季增加不明显,受此影响,近55a巴里坤气候总体趋于干旱向半干旱发展的趋势,其中2009~2015年降水量明显增加,蒸发量明显减少,气候处于相对湿润期。
In order to investigate the characteristics of the hydrological cycles in the Balikun Kazak auto-nomous county, north Hami area, the data of the precipitation and evaporation during 1961-2015 collected from the National basic meteorological station in the Balikun have been analyzed ac-cording to the linear regression, anomaly percentage, Mann-Kendall mutation test and index of dryness. The result indicates that during the past 55 years, the changes of the annual, seasonal precipitation and evaporation respectively are obvious. The trends of the annual and seasonal precipitations increased strongly, however in winter (December, January and February) the pre-cipitation kept stable. So, the climate at the Balikun is experiencing the turnover from the arid to semi-arid. Especially, during the 2009-2015, the precipitation increased obviously with the eva-poration decrease, the climate belonged at a relatively humid period.
农民工医疗保险现状及商业化保险可行性
宏伟,
中国公共卫生 , 2010, DOI: 10.11847/zgggws2010-26-03-48
Abstract: ?目前,中国农民工医疗保险在运作上面临着许多难点问题,影响医疗保险的覆盖面及保障水平。本研究在分析农民工医疗保险目前存在问题的基础上,结合商业保险优势以及商业医疗保险在社会医疗保险中的成功实践,对商业保险公司参与农民工医疗保险的可行性进行分析,提出和探索农民工医疗保险的商业化运作模式,以促使社会保险机构与保险公司就农民工医疗保险业务开展合作,在风险共担前提下,各自承担必要责任,共同提供良好的农民工医疗保险方法。现报告如下。
腹腔镜常用器械全子宫切除156例分析

第三军医大学学报 , 2010,
Abstract:
基于波动方程预测和双曲Radon变换联合压制表面多次波
,王维
地球物理学报 , 2012, DOI: 10.6038/j.issn.0001-5733.2012.09.029
Abstract: 基于波动方程预测的表面多次波压制方法可处理复杂地下介质的地震资料,但计算成本较高.基于滤波的多次波压制方法计算效率较高,但其成功应用仅局限于一次波和多次波有明显时差差别的地震数据,对来自速度逆转等复杂介质数据则较难获得满意的压制效果.本文将波动方程预测的反馈迭代法和滤波法有效结合,采用GPU(图形处理器)和CPU协同并行加速计算粗略预测表面多次波,随后在双曲Radon域比较分析原始数据和预测的多次波,设计合理有效的Butterworth型自适应滤波器,滤出原始数据Radon域中的多次波能量,进行Radon反变换后,在时空域将多次波从原始数据中减去,得多次波压制结果.文中对理论模拟的单炮数据、复杂的SMAART模型以及实际地震数据进行了计算,结果表明,结合基于波动方程预测和双曲Radon变换的方法有效突破了两种方法各自的局限性,可高效高精度地压制复杂地下介质的表面多次波.
湖南植烟土壤盐分及其表聚特征研究

土壤 , 2008,
Abstract: 对湖南主要植烟区表层土壤总盐及主要盐分离子的组成进行了分析。结果表明:烟叶收获后,植烟土壤盐分表聚现象严重,表层土壤总盐量达4.17g/kg,与强度盐化土相当。烟-稻轮作土壤盐分表聚明显强于旱地烟土壤,同时,在烟-稻轮作区又以衡阳土壤盐分含量最高,永州和郴州其次;烟-稻轮作区植烟土壤表层盐分离子以no3-、so42-、ca2+和k+为主,占总盐量的95.21%。
补肾健脾,化浊祛瘀治疗尿毒症体会

中国中医药信息杂志 , 2000,
Abstract: 尿毒症是各种肾脏疾病发展的终末结局,属于中医的“瘾闭”、“’肾风”、“关格”、“虚劳”等范畴.’肾脏疾病发展至尿毒症时,已命门亏损,五脏受累,水浊疲毒储留,虚实错杂,变证丛生,治疗颇为棘手.笔者通过长期临床实践,以标本兼治,补肾健脾,化浊祛疲论治尿毒症取得较好的治疗效果,现将治疗体会介绍如下.
对比续写对英语词汇习得的作用研究
Effects of the Comparative Continuation Task on English Vocabulary Learning
 [PDF]


Modern Linguistics (ML) , 2019, DOI: 10.12677/ML.2019.75094
Abstract:
本研究考察对比续写对三种不同体裁文章中的英语词汇习得的促学作用,具体通过对比概要写作和对比续写在三种不同体裁文章中的词汇促学效果是否存在显著性差异。研究结果表明:对比续写的短期和长期词汇促学效果都显著优于概要写作。该研究结果为英语教师提供了词汇教学的新思路,同时也为今后的“续”作研究提供借鉴和启示。
This study explores the effects of the comparative continuation task on English vocabulary learning. Specifically, it compares the effectiveness of the comparative continuation and summary writing on the learning of vocabulary in three types of articles to see whether there are significant differences between the two tasks. The results show that both the short-term and long-term effects of the comparative continuation task are significantly better than those of summary writing. These findings provide English teachers with a new task of vocabulary learning.
气相色谱/ECD法检测苯丙胺类毒品
Studies on Detection of Amphetamines by Gas Chromatography/ECD
 [PDF]

翟志强, , 周亚
Hans Journal of Chemical Engineering and Technology (HJCET) , 2014, DOI: 10.12677/HJCET.2014.46011
Abstract:
本文探究了气相色谱法的电子俘获检测器测定苯丙胺类毒品的方法。在一定色谱条件下利用苯丙胺、甲基苯丙胺、伪麻黄碱标准溶液绘制苯丙胺类毒品的标准曲线,得到苯丙胺的标准曲线为y = 5.36x ? 690.98,R = 0.9994,线性范围为2.0 × 102 μg?mL?1~1.0 × 103 μg?mL?1,检出限为2.0 × 102 μg?mL?1,相对标准偏差为9.83%,甲基苯丙胺的标准曲线为y = 1.34x + 215.8,R = 0.9980,线性范围为2.0 × 102 μg?mL?1~2.0 × 103 μg?mL?1,检出限为2.0 × 102 μg?mL?1,相对标准偏差为6.29%,伪麻黄碱的标准曲线为y = 8.07x + 176.38,R = 0.9988,线性范围为6.4 × 10?1 μg?mL?1~4.0 × 102 μg?mL?1,检出限为6.4 × 10?1 μg?mL?1,相对标准偏差为5.69%;并检测缴获的苯丙胺类毒品的有效成分及其含量。采用分散液相微萃取技术提取上述三种毒品,其平均回收率为39.70%、51.68%、65.05%。本文为法庭科学提供了检测苯丙胺类毒品的新方法。
This paper studies the way to detect amphetamines with the use of gas chromatography, or to be specific, the electron capture detector method. By detecting amphetamine, methamphetamine and pseudoephedrine under a certain condition, the standard curves were drawn. The standard curve of amphetamine is y = 5.36x ? 690.98, R = 0.9994. Its linearity range is 2.0 × 102 μg?mL?1~1.0 × 103 μg?mL?1. Its detection limit is 2.0 × 102 μg?mL?1 and its RSD is 9.83%. The standard curve of me-thamphetamine is y = 1.34x + 215.83, R = 0.9980. Its linearity range is 2.0 × 102 μg?mL?1~2.0×103 μg?mL?1. Its detection limit is 2.0×102μg?mL?1 and its RSD is 6.29%. The standard curve of pseu-doephedrine is y = 8.07x + 176.38, R = 0.9988. Its linearity range is 6.4 × 10?1 μg?mL?1~4.0 × 102 μg?mL?1. Its detection limit is 6.4 × 10?1 μg?mL?1 and its RSD is 5.69%. Some drugs seized by local police were analyzed and their active ingredients and contents were defined. Amphetamines were extracted with dispersive liquid-liquid microextraction (DLLME) and the results showed that the average recovery of amphetamine is 39.70%, methamphetamine’s is 51.68% and pseudoephe-drine’s is 65.05%. This article can provide as reference for judicial detecting of amphetamines.
莪术二酮对肝部分切除老年小鼠术后认知功能和海马区炎性因子表达的影响
Effects of curdione on cognitive function and expression of inflammatory factors in the hippocampus after partial hepatectomy in aged mice

,,,,李建雄
- , 2017, DOI: 10.7652/jdyxb201705026
Abstract: 摘要:目的 观察莪术二酮对肝部分切除的老年小鼠术后认知功能和海马区炎性因子表达的作用。方法 按文献报道方法建立肝部分切除老年小鼠模型,分为假手术组、手术组(模型组)及莪术二酮高、中、低剂量组(造模并药物干预),另设空白对照组。采用Morris水迷宫评价小鼠的认知功能,采用酶联免疫吸附法检测海马组织中超氧化物歧化酶(SOD)、丙二醛(MDA)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)的水平,Western blot检测海马中NF-κB、白介素-1β(IL-1β)、白介素-6(IL-6)及肿瘤坏死因子(TNF-α)蛋白的表达。结果 手术组动物水迷宫逃逸潜伏期时间明显延长(P<0.01),穿台次数显著减少(P<0.05);与手术组相比,莪术二酮显著性缩短术后逃逸潜伏期(P<0.05),并增加穿台次数(P<0.05)。肝切除术后海马组织中SOD、CAT和GSH-Px的含量均明显降低(P<0.05),MDA含量则明显升高(P<0.01)。莪术二酮组SOD、CAT和GSH-Px的含量明显升高(P<0.05),MDA释放减少(P<0.05)。莪术二酮组的术后NF-κB、IL-1β、IL-6及TNF-α蛋白的高表达显著抑制(P<0.05)。结论 莪术二酮可显著改善老年小鼠部分肝切除术后认知功能障碍,其机制可能与其通过抑制海马组织中氧化应激,抑制NF-κB激活,减少炎症细胞因子IL-1β、IL-6及TNF-α的释放有关。
ABSTRACT: Objective To explore the effects of curdione on cognitive function and expression of inflammatory factors in the hippocampus after partial hepatectomy in aged mice. Methods The animals were divided into control group, sham group, operation group, and high-, medium- and low-dose curdione groups. The model of partial hepatectomy in aged mice was established according to the method reported in literature. The levels of SOD, MDA, CAT and GSH-Px in the hippocampus were detected by enzyme-linked immunosorbent assay (ELISA), while the expressions of NF-κB, IL-1β, IL-6 and TNF-α were measured by Western blot. Results The escape latency was significantly increased (P<0.01), and the number of platform-site crossovers was significantly decreased in operation group (P<0.05). Compared with those in operation group, curdione significantly decreased escape latency and increased platform-site crossovers (P<0.05, P<0.05). The levels of SOD, CAT and GSH-Px in the hippocampus were significantly decreased (P<0.05) and the content of MDA was significantly increased after partial hepatectomy (P<0.01), and these were reversed by curdione (P<0.05, P<0.05, respectively). The expressions of NF-κB, IL-1β, IL-6 and TNF-α protein were significantly inhibited by curdione (P<0.05). Conclusion Curdione can significantly improve cognitive dysfunction after partial hepatectomy in aged mice and the mechanism may be related to its inhibition of oxidative stress, inhibition of NF-κB activation and reduction of inflammatory cytokines IL-1β, IL-6 and TNF-α in the hippocampus
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