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Search Results: 1 - 10 of 19047 matches for " 陆铖 "
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基于概率分布图的运动目标轮廓快速提取方法
,何东健
计算机应用 , 2008,
Abstract: ?以对图像分析起重要作用的目标轮廓提取技术为重点,研究并提出一种基于概率分布图的目标轮廓快速提取方法,该方法先从视频中检测到前景目标并建立目标概率模型,再根据建立的模型计算目标概率分布图,用该分布图提取出目标轮廓。对2330幅包含运动目标的视频帧进行测试,结果表明,该方法简单有效,处理速度快,提取的轮廓准确、清晰,对目标形变具有很好的鲁棒性。
Efficient method for object contour extraction based on probability distribution image
基于概率分布图的运动目标轮廓快速提取方法

LU Cheng,HE Dong-jian,
,何东健

计算机应用 , 2008,
Abstract: Focusing on object contour extraction technology that had the most significant impact on the process of image analysis, an efficient method was proposed for object contour extraction based on probability distribution. First the foreground object was detected and its hue feature was used to build an object probability model. With this model, the probability distribution image was calculated on the whole image for the object. Finally, the contour was obtained from the probability distribution image directly. ...
滨海围垦区不同陆生植物配置模式对土壤有机碳储量及土壤呼吸的影响
曹流芳,仲启,,,,,,,王开运
长江流域资源与环境 , 2014, DOI: 10.11870/cjlyzyyhj201405011
Abstract: 为了研究不同陆生植物配置模式对滨海围垦区土壤有机碳储量及土壤呼吸特征的影响,在崇明东滩围垦湿地公园栽植了8a的湿地松纯林、湿地松紫穗槐混交林及紫穗槐纯林3种典型陆生植物配置模式,以裸地作为对照,采用Li6400便携式光合作用仪的土壤呼吸叶室对其土壤呼吸进行了测定,期间对土壤有机碳含量及土壤容重,影响土壤呼吸的土壤微气候因子、植物群落结构等进行了同步测定。结果表明:土层0~40cm土壤有机碳储量变化范围为296~691kg/m2:湿地松紫穗槐混交林>裸地>紫穗槐纯林>湿地松纯林,不同植物配置模式对土壤有机碳储量改善不同,湿地松与紫穗槐混交配置比纯林更有利于增加滨海围垦区土壤有机碳储量;土壤呼吸速率年平均值变化范围为274~519μmol/(m2·s):紫穗槐纯林>湿地松紫穗槐混交林>湿地松纯林>裸地,土壤温度是影响滨海围垦区土壤呼吸的关键因子,各配置模式土壤呼吸的差异可能与其土壤有机碳储量及植物叶面积指数有关。可为滨海围垦区进行以增汇为目的人工管理提供科学依据
水位调控对崇明东滩围垦区滩涂湿地土壤呼吸的影响
仲启,关阅章,刘倩,曹流芳,,王璐,王开运**
应用生态学报 , 2013,
Abstract: 以长江口崇明东滩围垦区滩涂湿地3个地下水位梯度(低水位、中水位和高水位)为对象,于2011年1月至2012年1月测定了湿地的土壤呼吸速率及其主要影响因子.结果表明:围垦区滩涂湿地低水位、中水位和高水位的土壤呼吸速率年变化幅度分别为0.75~11.57、0.70~12.61和0.83~6.67μmol·m-2·s-1,土壤呼吸速率的最大值出现在7月,最小值出现在1月;在3个梯度下,0~5cm层土壤温度为驱动围垦区滩涂湿地土壤呼吸季节动态的关键微气象因子,拟合指数模型可以解释其70%以上的季节变异,而各梯度间土壤呼吸温度敏感性(q10值)无显著差异;高水位的土壤呼吸速率最低,可能与土壤温度较低和土壤体积含水量较高有关,中水位的土壤呼吸速率高于低水位,可能是土壤电导率和容重较低,地上生物量和细根密度较高的结果.合理调控围垦区滩涂湿地水位可以降低土壤呼吸速率,增强该类退化湿地的碳汇功能.?
香鱼补体成分C9基因的克隆、序列分析及表达
,黄左安,陈炯,史雨红,新江
动物学研究 , 2012, DOI: 10.3724/SP.J.1141.2012.02151
Abstract: 补体成分C9是构成膜攻击复合体引起靶细胞溶解破坏的重要组成成分。该文测定了香鱼C9(aC9)基因的cDNA全序列,序列全长2125个核苷酸,编码一个由592个氨基酸组成、相对分子质量为6.56×104的前体蛋白,N端22个氨基酸为信号肽序列。序列分析表明,aC9与虹鳟C9的氨基酸同源性最高,达56.8%,与其它鱼类C9的同源性介于40.9%~53.8%之间。aC9在健康香鱼肝、脾、肠、鳃和肌肉有表达,其中在肝内的表达量最高。实时荧光定量PCR的结果显示,鳗利斯顿氏菌侵染4h后,肝中aC9mRNA表达量显著上调,并随着时间的推移在16h时达到峰值。Westernblotting分析的结果显示,鳗利斯顿氏菌侵染后香鱼血清中的aC9蛋白随着时间的推移呈显著上调。以上结果表明,香鱼肝组织C9基因表达变化与鳗利斯顿氏菌的侵染密切相关,揭示了C9在鱼类抗细菌免疫反应中具有重要的作用。
养肝益水颗粒对自发性高血压大鼠肾组织TGF-β1、PI3K和PKB的影响
蔡曼曼,龙子江,周宜轩,丁伯春,,松侠
药物评价研究 , 2013, DOI: 10.7501/j.issn.1674-6376.2013.4.005
Abstract: 目的 观察养肝益水颗粒对自发性高血压大鼠肾组织转化生长因子-β1(TGF-β1)、磷脂酰肌醇-3激酶(PI3K)和蛋白激酶B(PKB)的影响,探讨养肝益水颗粒对原发性高血压早期肾损害的作用及机制。方法 取50只12周龄收缩压大于150 mmHg的自发性高血压大鼠,随机分为模型组,养肝益水颗粒高、中、低剂量组(10.8、5.4、2.7 g/kg)和阳性对照药厄贝沙坦组(0.015 g/kg),每组10只;另取10只Wistar雄性大鼠作为正常对照组,模型组和正常对照组ig给予等量蒸馏水,每天1次,共12周。给药前和给药12周后用酶联免疫吸附法(ELISA)检测各组大鼠尿微量白蛋白(UMA)浓度;末次给药后,用免疫组化法检测各组大鼠肾脏组织中TGF-β1和PI3K的表达;用ELISA法检测PKB的浓度。结果 养肝益水颗粒有效地降低了UMA浓度和肾脏组织TGF-β1;升高了肾脏组织PI3K和PKB水平。结论 养肝益水颗粒对高血压的早期肾损害有一定的抑制作用,其作用机制可能与影响TGF-β1、PI3K和PKB的含量有关。
hplc-dad同时测定黄芪生脉饮中4种成分含量
,周盛会,李炜,郑修丽,高庆剑,汤浩
中国中医药信息杂志 , 2015, DOI: 10.3969/j.issn.1005-5304.2015.07.027
Abstract: 目的采用高效液相色谱法建立同时测定黄芪生脉饮中五味子乙素、五味子酯甲、党参炔苷和鲁斯可皂苷元含量的方法。方法色谱柱:agilenteclipsec18(4.6mm×250mm,5μm);柱温:30℃;流动相:乙腈-0.1%冰醋酸水溶液,梯度洗脱;流速:1.0ml/min;检测波长:280nm。结果五味子乙素、五味子酯甲、党参炔苷和鲁斯可皂苷元的标准曲线线性关系良好,线性范围分别为0.8625~21.5625μg(r2=0.9991)、0.7375~18.4375μg(r2=0.9994)、0.0952~2.3800μg(r2=0.9996)、0.8100~20.2500μg(r2=0.9990),平均回收率分别为98.06%、99.61%、97.98%、99.30%,rsd分别为1.64%、2.72%、1.45%、1.25%。结论该法准确可靠、快速、专属性强、结果稳定、重复性好。
血清乙型肝炎核心相关抗原阴性正常参考值的探讨
张占卿,,王雁冰,翁齐,张智勇,周新兰
- , 2016, DOI: 10.16118/j.1008-0392.2016.02.006
Abstract: 目的 探讨血清HBcrAg合理的阴性正常参考值。方法 初治的乙型肝炎患者230例和非乙型肝炎患者52例入选本研究。血清HBcrAg采用化学发光酶免疫法和Fujirebio Lumipulse G1200全自动化学发光免疫系统检测。数据处理和统计分析采用SPSS 16.0软件。结果血清HBcrAg呈非正态分布(P<0.01)。HBsAg阳性患者血清HBcrAg与HBV DNA呈显著正相关(P<0.01)。血清HBcrAg诊断HBsAg阳性患者的ROC曲线下面积(0.953)显著大于对角参考线下面积(P<0.01)。当血清HBcrAg≥1500U/ml、≥1250U/ml、≥1000U/ml、≥750U/ml、≥500U/ml时,其诊断HBsAg阳性患者的灵敏度和特异度分别为0.865和0.981、0.865和0.962、0.870和0.923、0.896和0.904、0.909和0.885。结论 血清HBcrAg<1000U/ml可能是合理的阴性正常参考值。
Objective To explore the rational negative normal reference value of serum hepatitis B core-related antigen(HBcrAg). Methods Two hundred and thirty patients with Nave hepatitis B and 52 non- hepatitis B patients were enrolled in the study. Serum HBcrAg levels were measured by Fujirebio Lumipulse G1200 automatic chemiluminescence immunoassay system. SPSS 16.0 software was used for data processes and statistical analyses. Results Serum HBcrAg values were non-normal distribution(P<0.01). Serum HBcrAg values were positively correlated with HBV DNA in HBsAg-positive patents(P<0.01). The area under ROC curve of serum HBcrAg in the diagnosis of HBsAg-positive patients was 0.953. When the cut-off values of serum HBcrAg were taken as 1500U/ml, 1250U/ml, 1000U/ml, 750U/ml, 500U/ml, the sensitivity and specificity in diagnosis of HBsAg-positive patients were 0.865 and 0.981,0.865 and 0.962,0.870 and 0.923,0.896 and 0.904,0.909 and 0.885. Conclusion Serum HBcrAg<1000U/ml may be the reasonable negative normal reference value
血清病毒学标记物预测慢性乙型肝炎肝组织病理状态的评价
张占卿,,翁齐,张智勇,王雁冰,冯艳玲
- , 2015, DOI: 10.16118/j.1008-0392.2015.04.012
Abstract: 目的评价血清病毒学标记物预测慢性乙型肝炎(CHB)肝组织病理状态的有效性。方法 CHB患者211例,其中HBeAg阳性和阴性患者分别为125例和86例。血清HBsAg、HBeAg、抗-HBc和HBcrAg分别采用化学发光微粒子免疫法和化学发光酶免疫法检测,血清HBV DNA采用实时荧光定量PCR检测。结果 HBeAg阳性患者,血清HBsAg、HBeAg、HBcrAg、HBV DNA与病理学分级和分期均呈显著负相关(P<0.05);血清抗-HBc与病理学分级和分期均呈显著正相关(P<0.05);HBeAg阴性患者,血清HBsAg、抗-HBc与病理学分级和分期无显著相关性(P>0.05);血清HBcrAg、HBV DNA与病理学分级和分期均呈显著正相关(P<0.01)。有序logistic回归分析显示,HBeAg阳性患者,血清HBsAg预测病理学分级和HBsAg、HBeAg预测病理学分期的偏回归系数有统计学意义(P<0.05);HBeAg阴性患者,血清HBcrAg和HBV DNA预测病理学分级和分期的偏回归系数均有统计学意义(P<0.05)。结论 血清HBsAg和血清HBsAg、HBeAg分别有预测HBeAg阳性患者肝组织病理学分级和分期的价值,血清HBcrAg和HBV DNA均有预测HBeAg阴性患者肝组织病理学分级和分期的意义。
Objective To assess the application of serum viral markers in prediction of pathological status of liver tissue in patients with chronic hepatitis B. Methods Two hundred and eleven patients with chronic hepatitis B, including 125 HBeAg-positive and 86 HBeAg-negative patients, were enrolled in present study. Serum HBsAg, HBeAg, anti-HBc and HBcrAg were measured by chemilu-minescence microparticle immunoassay and chemiluminescence enzyme immunoassay, respectively; HBV DNA was assayed by Real Time fluorescent quantitative PCR. ResultsIn HBeAg-positive patients, serum HBsAg, HBeAg, HBcrAg and HBV DNA were significantly correlated negatively with the pathological grading and staging of liver tissue(P<0.05), and serum anti-HBc was significantly correlated positively with the pathological grading and staging of liver tissue(P<0.05). in HBeAg-negative patients, serum HBsAg and anti-HBc were not correlated with the pathological grading and staging of liver tissue(P>0.05), however, serum HBcrAg and HBV DNA were significantly correlated positively with the pathological grading and staging of liver tissue(P<0.01). Ordinal logistic regression analyses showed that in HBeAg-positive patients the partial regression coefficients of serum HBsAg in predicting the pathological grading and serum HBsAg, HBeAg in predicting the pathological staging of liver tissue had statistical significance(P<0.05); in HBeAg-negative patients, the partial regression coefficients of serum HBcrAg and HBV DNA in predicting both the pathological grading and staging of liver tissue had statistical significance(P<0.05). Conclusion Serum HBsAg and HBsAg, HBeAg in HBeAg-positive patients have predictive value to the pathological grading and staging, and serum HBcrAg and HBV DNA in HBeAg-negative patients have predictive significance to the pathological grading and staging of liver tissue
火灾后混凝土预应力桥梁检测试验与评估
Test and Assessment of Prestressed Concrete Bridge after Fire
 [PDF]

冯兆祥,, 缪长青
Hans Journal of Civil Engineering (HJCE) , 2015, DOI: 10.12677/HJCE.2015.45029
Abstract: 以常熟浒浦大桥为背景,对于火灾后预应力钢筋混凝土桥梁进行评估分析研究。从火灾裂缝、混凝土脱落、受力钢筋露筋等方面对于桥梁进行了火灾病害观测分析,通过混凝土强度测定、静力荷载试验和有限元分析,对于火灾后桥梁的承载能力进行了分析评估。结果表明受火区作用较严重的简支空心板力学性能下降明显。
Changshu Hupu Bridge was taken as an example to test and evaluate the prestressed concrete bridge after fire. On the fire crack, the concrete loss, and the reinforced exposure, the bridge fire disease was observed and analyzed. Taking the determination of concrete strength, static loading testing, and finite element analysis, the carrying capacity of the bridge after fire was analyzed and evaluated. The results showed that the simply-supported hollow slab mechanics performance in seriously fired area declines obviously.
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