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Search Results: 1 - 10 of 47561 matches for " 高红艳 "
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美洛昔康的单扫示波极谱法
黄鹤,红艳,曾泳淮
分析化学 , 2000,
Abstract: 在HAc-NaAc(pH4.76)底液中,用单扫示波极谱法可以得到一个灵敏的美洛昔康二阶导数还原峰,其峰电位Ep=-1.28V(vs.SCE).峰电流与美洛昔康浓度在9.0×10-8~6.0×10-6mol/L范围内呈线性关系(r=0.9994),检出限为3.0×10-8mol/L.该法应用于片剂中美洛昔康含量的测定,结果令人满意。
美洛昔康的吸附伏安特性
黄鹤,红艳,曾泳淮
药学学报 , 2000,
Abstract: 目的 研究美洛昔康(meloxicam,简称mlx)的电化学行为和电极反应机理,拟定了测定mlx的吸附伏安法。方法 用单扫示波极谱法、循环伏安法和脉冲极谱法等多种技术进行研究。结果 在hac-naac(ph4.76)底液中,mlx在汞电极上有一线性扫描还原峰,峰电位ep=-1.19v(vsag/agcl),该峰有明显的吸附性。吸附粒子为mlx中性分子,测得mlx在汞电极上的饱和吸附量为1.53×10-10mol.cm-2,每个mlx分子所占电极面积为1.08nm2,mlx在悬汞电极上的吸附符合frumkin等温式。测得吸附系数β=1.65×106,电子转移数(n)为2,不可逆吸附的电子转移系数(α)为0.84,表面电极反应的速率常数ks=0.19.s-1。建立了吸附伏安法测定mlx的最佳条件,检出限为1.0×10-9mol.l-1。结论 证实该体系为具有吸附性的不可逆过程。
黄河遥感影像数据库系统建设研究
李燕,红艳,冰生
人民黄河 , 2010,
Abstract: ?对黄河遥感影像数据库系统的建设目标、系统架构、关键技术等进行了分析.该数据库系统主要包括原始遥感影像库、校正遥感影像库、数字正射影像库、地理信息库、控制点库、应用成果数据库和元数据库等7个子数据库.系统建设的关键技术包括影像数据库引擎设计和影像地图服务器设计、影像数据库引擎设计包括遥感影像元数据模型构建、遥感影像元数据xml描述和影像数据库引擎设计等.
基于部分互信息和贝叶斯打分函数的基因调控网络构建算法
Inferring Gene Regulatory Networks Based on Part Mutual Information and Bayesian Scoring Function

刘飞,张绍武,红艳
- , 2017,
Abstract: 从基因表达数据出发重构基因调控网络,可有效挖掘基因间调控关系,深层次地理解生物调控过程。传统的相关性系数模型、偏相关系数模型仅能发现基因间线性关系,而互信息和条件互信息可用于发现基因间的非线性关系,且能够处理高维低样本基因表达数据。但互信息过高估计基因间的相关性,条件互信息过低估计基因间的相关性,从而导致推断出的基因网络假阳性率和假阴性率较高,且不能推断基因调控方向。因而,基于部分互信息和贝叶斯打分函数,提出一种新的基因调控网络构建算法(命名为PMIBSF)。基于部分互信息,PMIBSF算法首先删除初始基因相关网络中的冗余关联边,然后采用贝叶斯网络互信息测试打分函数学习贝叶斯网络结构,快速构建基因调控网络。在计算机模拟网络和真实生物分子网络上,仿真实验结果表明:PMIBSF性能优于目前较流行的LP、PC-alg、NARROMI和ARACNE算法,可高精度构建基因调控网络。
The inference of gene regulatory networks (GRNs) from expression data can mine the direct regulations among genes and gain deep insights into biological processes at a network level. The most widely used criteria are the Pearson correlation coefficient and partial correlation, but they can only measure linearly direct association and miss nonlinear associations. Mutual information (MI) and conditional Mutual information (CMI) not only can overcome those disadvantages, but also can process the gene expression data which are high dimensional and low samples. MI and CMI are widely used in quantifying both linear and nonlinear associations, but they suffer from the serious problems of overestimation and underestimation. GRNS based on MI and CMI suffer from higher false-positive and false-negative problem and can't identify the directions of regulatory interactions. By using the partial mutual information (PMI) and Bayesian scoring function (BSF), in this work, we present a novel algorithm (namely PMIBSF). Tested on the Synthetic networks as well as real biological molecular networks with different sizes and topologies, the results show that PMIBSF can infer RGNs with higher accuracy. The PMIBSF's performance outperforms other state-of-the-art methods, such as LP, PC-alg, NARROMI and ARACNE
公共交通网络的复杂性及其优化――以宝鸡市为例
Complexity and optimization of public transit network: Taking Baoji for example

红艳,刘飞,钱郁
- , 2018,
Abstract: 为了减缓城市交通拥堵,改变城市公交线路规划不合理的状况,采用复杂网络的分析方法研究城市公交系统,构建公交网络模型,分析公交站点中心性、公交路段中心性、公交网络聚类特性、小世界性、集团特性和抗毁性等重要指标。以宝鸡市公交网络为例,基于Space L方法构建宝鸡市公交网络模型,用节点度和节点介数衡量站点的重要性,用边介数衡量公交路段的重要性,用聚类系数、最短路径衡量公交网络的复杂网络特性,采用GN算法对公交网络进行了社团划分。采用随机和突发2种策略对网络进行了攻击,验证公交网络的鲁棒性。研究结果表明:宝鸡市公交站点网络和大多数公交网络一样具有幂律分布特性,该网络可划分为11个明显的社团;该网络对于随机攻击具有较好的鲁棒性,对于基于度的蓄意攻击具有较大的脆弱性,和全国大中城市相比,宝鸡市公交网络的集团化程度较低。据此提出优化公交网络的方法,对关键站点实行分流,对关键路段实行绕行,根据社团划分和网络整体结构优化公交路网,建设智能公交系统,规划城市建设,研究结果可为宝鸡市交通线路规划和城市建设提供理论依据。
In order to reduce the urban traffic congestion and change the unreasonable situation of urban public transit route planning, the urban public transit system was studied with the method of complex network, and the public transit network was constructed, the important parameters such as the centrality of bus station, the centrality of bus section, the clustering characteristic of bus network, the small world, the group characteristic and the destructiveness were studied, take Baoji public transit network as an example. Public transit network model of Baoji was constructed based on Space L method, the degree and betweenness of nodes were used to measure the importance of the bus stations, the betweenness of edges were used to measure the importance of the bus routes, and the clustering coefficient and the shortest path were used to measure the complexity of the public transit network. The community structure of public transit network was detected by GN algorithm. The robustness of public transit network was verified,when the network was attacked by two strategies such as random attack strategy and burst attack strategy. The results show that Baoji public transit network has the same power??law as public transit networks, which can be divided into 11 distinct community structures. The network is robust to random attacks and vulnerable to deliberate attacks based on degree. Compared with large and medium??sized cities in China, the collectivization degree of Baoji public transit network is relatively low. The methods of optimizing Baoji public transit network are proposed, such as dividing the key stations , detouring the key sections, according to the community division and the overall network structure, the road network is optimized, the intelligent bus system is constructed and the urban construction is planned. It can provide theoretical basis for traffic line planning and urban construction in Baoji City. 6 tabs, 7 figs, 25 refs.?
英法土地所有制变迁比较研究—封建社会向资本主义社会的过渡
Comparative Study of English-French Land Tenure Systems—From the Feudal Age to the Capitalistic Period
 [PDF]

红艳
Open Journal of Historical Studies (OJHS) , 2015, DOI: 10.12677/OJHS.2015.33006
Abstract:
中世纪的英国和法国都以封建领主制下的庄园经济为主要经济形态,土地所有制表现为土地等级所有,然而在早期资本主义因素出现以后,两国的土地所有制却向不同的方向转变。英国资本主义革命以后,土地制度逐渐演化成资本主义大土地所有制,而法国则形成了以小农土地所有制为主、多种土地所有制形式并存的状况。两个相同国家在土地制度的演变方面出现同源异流的原因是多方面的,其中经济发展水平、政治传统、法律制度发展、文化宗教等因素起到至关重要的作用。英法两国长达几百年的土地制度变迁过程将给我国土地政策的制定提供一定借鉴。
In the middle age, manorial system existed in both England and France, and it was the main land system in the two countries. When the early Capitalism factors appeared, the land ownership of the two countries changed in different ways into two different systems. After the Bourgeois Revolution in England, the agricultural capitalists became the owners of most lands in the country, and there were few farmers. In France, however, the land system went to a different way after the Great Revolution. Most farmers had their small lands and their children could inherit them. The economy, politics and culture were the main factors that affected the development of the two countries’ land ownership systems. The process of hundreds of years of land system change in England and France can provide certain reference to the formulation of Chinese land policy.
陕西省近47 a来降水变化分析
蔡新玲,贺 皓,王繁强,红艳
中国沙漠 , 2010,
Abstract: 利用陕西省78个气象观测台站1961—2007年逐日降水量资料,分析了陕西地区降水变化特征及其对旱涝的影响。结果表明,47 a来陕西地区的年降水量呈明显的减少趋势,减少幅度为18.4 mm/10a,主要表现为春秋季降水的减少;降水日数的变化呈减少趋势,递减率为3.2 d/10a,主要体现在小雨和中雨事件频率的下降;但是平均降水强度总体呈微弱的增强趋势,主要原因是大雨和暴雨频次的增加。在显著变暖的20世纪90年代以后,雨日减少,但暴雨增多,强度增强,该区域降水有向不均衡、极端化发展的趋势,旱涝灾害也有加重趋势。
60Co-γ辐照对Na2SO4胁迫下乌拉尔
韩亚楠,吴琼,,马淼,红艳
草业科学 , 2015, DOI: 10.11829\j.issn.1001-0629.2014-0237
Abstract: ?采用不同剂量(0~300Gy)的60Co-γ射线辐照乌拉尔甘草(Glycyrrhizauralensis)种子,研究辐照处理对乌拉尔甘草种子在不同浓度Na2SO4(0~400mmol·L-1)胁迫下发芽率、累积发芽率和发芽指数的影响,以期筛选出能够提高乌拉尔甘草种子耐盐性能的最佳辐射剂量。结果表明,随着盐浓度的升高,种子的发芽率和发芽指数呈下降趋势,发芽时间延迟,高盐浓度溶液对种子萌发率的影响较为强烈。但60Co-γ辐照处理的乌拉尔甘草种子在高盐环境中的萌发率(GP=12.22%)极显著(P=0.00)高于对照(GP=0)。说明60Co-γ辐照处理确实能够有效提高乌拉尔甘草种子在Na2SO4胁迫下的发芽率,尤以经100Gy辐照处理的乌拉尔甘草种子作用效果最好,对Na2SO4胁迫表现出了较好的耐性。
陕西省近47a来降水变化分析
蔡新玲, 贺 皓, 王繁强, 红艳
中国沙漠 , 2010,
Abstract: 利用陕西省78个气象观测台站1961—2007年逐日降水量资料,分析了陕西地区降水变化特征及其对旱涝的影响。结果表明,47a来陕西地区的年降水量呈明显的减少趋势,减少幅度为18.4mm/10a,主要表现为春秋季降水的减少;降水日数的变化呈减少趋势,递减率为3.2d/10a,主要体现在小雨和中雨事件频率的下降;但是平均降水强度总体呈微弱的增强趋势,主要原因是大雨和暴雨频次的增加。在显著变暖的20世纪90年代以后,雨日减少,但暴雨增多,强度增强,该区域降水有向不均衡、极端化发展的趋势,旱涝灾害也有加重趋势。
甲基叔丁基醚对整体染毒小鼠的遗传毒性研究
红艳,锦伍,汪国雄,杨红
中国公共卫生 , 2002, DOI: 10.11847/zgggws2002-18-08-15
Abstract: ?目的探讨国产甲基叔丁基醚的遗传毒性作用.方法对小鼠经呼吸道染毒20天,染毒剂量分别为108、1440、4968mg/m3,分别进行单细胞凝胶电泳试验、DNA交联试验和微核试验.结果甲基叔丁基醚可引起整体染毒小鼠肝、肾、肺细胞的DNA单链断裂,可引起4968mg/m3剂量组动物微核率的增加,不引起肝细胞DNA的交联.结论甲基叔丁基醚在DNA水平和染色体水平有一定的遗传毒性作用.
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