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Search Results: 1 - 10 of 271408 matches for " <br>陆丹 "
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1998年秋到1999年春华南特大干旱气候成因

气象 , 2001, DOI: 10.7519/j.issn.1000-0526.2001.1.010
Abstract: 利用奇异值分解(svd),配合统计相关技术的应用,研究了广西秋季到第2年3月降水与500hpa高度场和热带、北太平洋海温场的时间和空间结构及其相互关系。结果表明,第一耦合场明显反映了enso信息,具有很高的相关;而海气配对的第二耦合场反映了作为关键区的日本海域以东的海温与100°e以东500hpa高度有较好的负相关。分析1998年以来海气场的变化,高度场上北太平洋中高纬500hpa高度明显偏低,亚洲大陆和北太平洋中低纬高度偏高,因此其间冷空气明显偏弱,路径偏东;而海温场上enso的变化,lanina的
Identification and detection of trag: a new infection-related gene expressed in vivo from isolates of Streptococcus suis
体内表达新基因trag在猪链球菌的分布及其免疫反应性分析

Haodan Zhu,Hongwei Gu,Chengping Lu,<br>祝昊,顾宏伟,承平
微生物学报 , 2008,
Abstract: 【目的】trag(transfer gene G)是利用IVIAT(in vivo induced antigen technology)通量筛选鉴定的猪链球菌2型(Streptococcus suis type 2,SS2)感染相关因子,研究该基因在猪链球菌(Streptococcus suis,SS)中的分布情况,研究康复血清与免疫血清在免疫印迹中的反应性有无,间接证明其在体内感染与体外培养时表达差异。【方法】鉴于我国分离株trag与GenBank公布的SS2北美株89/1591的trag序列有95.8%的同源性,据此设计和合成一对检测引物,对SS2我国江苏及四川流行株、其他临床分离株和参考株及SS1、SS1/2、SS9、SS7及C群猪源链球菌共43株进行PCR扩增。另设计一对引物,扩增5株SS代表菌株trag的完整阅读框,并对扩增产物进行测序。据软件分析后,选择TRAG(Transfer protein G?)免疫原性良好的区域片段的核酸设计表达引物,PCR扩增后定向克隆至表达载体pET28a(+)构建表达质粒,表达蛋白转印到PVDF膜上,分别与SS2猪康复血清和猪高免血清反应。【结果】trag在SS2中94%(30/32)阳性,SS9中67%(4/6)阳性,SS7阳性,SS1、SS1/2及C群菌阴性。5株细菌TRAG的氨基酸序列与SS2中国株98HAH33、05ZYH33及北美株89/1591同源性>97%。所获得重组蛋白只能被康复血清识别。【结论】从SS 致病株中检出感染相关基因trag,提示该基因可能与SS 致病性有关,重组蛋白的免疫转印结果表明,TRAG可能与SS2体内感染相关。
De-noising and enhancement for SAR image based on local geometric structure of image
基于图像局部几何结构的SAR图像降噪与增强*

LU Dan,TANG Ping,GUO Tong,<br>,唐娉,郭彤
计算机应用研究 , 2009,
Abstract: This paper investigated anisotropic diffusion for SAR image based on local geometric structure of image. Firstly, it reviewed three anisotropic diffusion models: PM model, Weickert model and Tschumperle trace-based model and pointed out that the trace-baced model which could perform directional diffusion according to local geometric structure and whose diffusion ability depends on diffusivity functions was more controllable and meaningful. Then, following the principle of diffusion coefficients, it proposed new diffusivity functions combining image enhancement and diffusion control for SAR speckle reduction. The experimental results show that applying new diffusivity functions not only reduces SAR speckle efficiently but also enhances edges and details and achieves ideal effect.
Variation of South China Rainfall in June and Its Association with the East Asia-Pacific Teleconnection
华南6月降水异常及其与东亚—太平洋遥相关的关系

CHEN Ruidan,WEN Zhiping,LU Riyu,WU Liji,<br>陈锐,温之平,日宇,吴丽姬
大气科学 , 2012,
Abstract: Based on the atmospheric circulation and rainfall data from 1959 to 2010, the variations of summer monsoon rainfall in the pre-rainy season in South China, i.e., rainfall in June, are analyzed in this study. The results show that the South China rainfall anomaly in June is significantly related to the East Asia-Pacific (EAP) teleconnection pattern with a correlation coefficient of 0.35. When the EAP index is positive, above-normal rainfall occurs over the areas south of the middle and lower reaches of the Yangtze River, and below-normal rainfall occurs over the areas between the Yangtze River and the Yellow River. Furthermore, the South China rainfall in June is divided into two time series: one is dependent on the EAP pattern and the other is independent of the EAP pattern. Comparisons between the two corresponding atmospheric circulation anomalies are followed up. The atmospheric circulation anomalies corresponding to rainfall time series dependent on the EAP pattern are similar to the distributions of EAP related circulation anomalies. When the EAP rainfall is above-normal, there is a combination of anti-cyclonic, cyclonic, and anti-cyclonic anomalies from low latitudes to high latitudes over the tropical western North Pacific and East Asia in the lower troposphere. The southerly and northerly anomalies meet over South China, leading to above-normal rainfall there. Meanwhile, the Huaihe River basin is occupied by northerly anomalies, resulting in below-normal rainfall. By contrast, the atmospheric anomalies corresponding to the above-normal rainfall time series that is independent of the EAP pattern are characterized by an obvious anti-cyclonic anomaly over the tropical western North Pacific and southwesterly anomalies over South China, which favor water vapor transportation and resultant above-normal rainfall.
Determination of nucleosides in Rhizoma Pinelliae by high performance liquid chromatography
高效液相色谱法同时测定中药材虎掌南星的核苷类成分

LU Dan,LUO Fen,CHI Yumei,WU Hao,<br>,罗芬,池玉梅,吴皓
色谱 , 2011,
Abstract: A high performance liquid chromatographic (HPLC) method was established to determine nucleosides in Rhizoma Pinelliae, which is a dried stem tuber of Pinellia pedatisecta Schott in Pinellia plant belonging to Araceae family and has multiple efficiencies about downbear counterflow and check vomiting, eliminating dampness and phlegm, etc. The separation of adenine, hypoxanthine, xanthine, uridine, thymine, adenosine and guanosine was achieved on a Lichrospher C18 column (150 mm×4.6 mm, 5 μm) with the detection at 254 nm and gradient elution by acetonitrile-water containing 0.1% formic acid as the mobile phase. The linear ranges were from 1.6 mg/L to 50 mg/L for adenine, hypoxanthine, xanthine, uridine and guanosine, while from 1.2 mg/L to 40 mg/L for thymine and adenosine with correlation coefficients above 0.9995. The average recoveries were between 98.9% and 101.2% with the relative standard deviations below 3%. The results of methodological study demonstrated that the method met the requirements of the determination. The nucleosides in Rhizoma Pinelliae from different districts were determined. The method is convenient and accurate with good reproducibility and can be used to evaluate the quality of Rhizoma Pinelliae.
The Crossing Number of 4-Regular Graphs
四正则图的交叉数

YANG Yuan-sheng,WANG Dan,LU Wei-ming,<br>杨元生,,维明
软件学报 , 2002,
Abstract: 利用计算机对图的交叉数进行研究,给出了利用分支界限法计算图的交叉数的算法CCN(calculatecrossing number),并利用该算法计算出n≤12的所有四正则图的交叉数以及n≤16的随机四正则图的交叉数.同时计算出n≤12的所有四正则图的平均交叉数Aac(n)和n≤16的随机四正则图的平均交叉数Aac(n),根据计算结果提出四正则图的平均交叉数为O(n
基于秩和比法的不同临床科室医院感染风险评估
Risk assessment on healthcareassociated infection in different clinical departments based on ranksum ratio method

甘泳江, 芸芸,燕<br>GAN Yongjiang, LU Yunyun, LIANG Danyan
- , 2018, DOI: 10.3969/j.issn.1671-9638.2018.05.011
Abstract: 目的通过运用秩和比法对某三级甲等综合性医院临床科室进行风险评估,筛选出医院感染高风险的科室,为制定医院感染控制策略提供依据。方法运用秩和比法,选择7项指标对某院2016年临床部门的医院感染控制进行风险评估,划分出高度、中度、低度风险的界定线。结果2016年28个临床科室各评价指标完成情况中未出现全优或全差的现象。秩和值与概率单位存在高度相关性(相关系数r=0.944,P<0.01,直线回归方程RSR=-0.022+0.106Y)。对各科室的RSR值进行频数分析,结果符合正态分布(KS检验,P=0.873),大部分科室处于中度风险,只有少数科室处于高度或低度风险。处于高度风险的6个科室及RSR值分别为神经内科(0.7165)、重症医学科(0.6763)、创伤手外科(0.6652)、神经外科(0.6406)、关节外科(0.6317)和呼吸内科(0.6205)。结论运用秩和比法可以真实、客观、科学地评估医院感染风险,明确医院感染防控工作的重点,提高高风险科室的资源配置,降低医院感染的发生
上海虹口区医疗机构冰箱卫生及管理现况
Hygiene and management status of refrigerators in medical institutions in Hongkou District of Shanghai

齐真真,珏磊,华 <br>QI Zhenzhen, LU Juelei, WANG Danhua
- , 2018, DOI: 10.3969/j.issn.1671-9638.2018.08.016
Abstract: 目的了解上海虹口区医疗机构医用冰箱的微生物污染及管理情况。方法采用问卷调查法了解各医疗机构的冰箱管理制度,并对冰箱表面进行卫生学采样,计算菌落总数,鉴定微生物种类。结果共调查13所医疗机构71个科室的71台医用冰箱,三级医疗机构30台,二级医疗机构21台,一级及民营医疗机构各10台。71个科室中,制定医用冰箱管理制度的仅占63.38%(45/71);医用冰箱采用数字化温控系统的仅占25.35%(18/71);使用电话/短信报警的占28.17%(20/71);在人员培训方面,进行过冰箱管理培训的科室占49.30%(35/71),15.49%(11/71)的科室未记录冰箱的运行情况,80.28%(57/71)的科室对冰箱实施定期消毒。71台医用冰箱中,2台冰箱表面菌落总数超过10 CFU/cm2,分别来自检验科和门诊药房;27台冰箱检出真菌,5台冰箱检出金黄色葡萄球菌;4台冰箱检出鲍曼不动杆菌;均未检出大肠菌群。药房、检验科和普通病房医用冰箱表面均检出真菌,并且在药房和普通病房冰箱表面检出金黄色葡萄球菌和鲍曼不动杆菌,ICU 1台冰箱表面检出真菌、1台冰箱检出金黄色葡萄球菌。结论医疗机构医用冰箱的管理存在欠缺,应针对不同级别、不同科室、冰箱不同使用情况制定完善的管理制度,加强温度监控及记录,明确医用冰箱的清洁消毒措施与频率
功能梯度材料拓扑优化研究
,刘毅
科技导报 , 2007,
Abstract: 改进了传统的双向渐进拓扑优化(BESO)方法,引入了新的增删单元准则,结合梯度单元法成功地对功能梯度材料进行了拓扑优化,对今后进一步的发展作了展望。
吲哚美辛-peg6000滴丸的研究
,
药学学报 , 1992,
Abstract: 以聚乙二醇6000(简称peg6000)为载体制成吲哚美辛滴丸。测得滴丸的溶解度比原药吲哚美辛增大一倍多,剂量减半时,滴丸对大鼠胃的刺激性显著降低,且仍有抑制基础胃酸分泌的作用。
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