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Search Results: 1 - 10 of 136788 matches for " 周振超 "
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水凝胶的改性及其在生物医学中的 应用研究进展
The Progress of Modification and Biomedical Applications of Hydrogels
 [PDF]

, 胡克, 马晓娥, 乃珍, 张天柱, 顾宁
Advances in Material Chemistry (AMC) , 2014, DOI: 10.12677/AMC.2014.22005
Abstract:
水凝胶的改性是水凝胶在多方面获得应用的前提条件。本文重点综述了几类水凝胶的改性及其应用进展,包括聚乙烯醇(PVA)和明胶复合水凝胶、蛋白质水凝胶、新型智能水凝胶以及纳米水凝胶。同时指出要密切关注改性水凝胶的生物相容性、成本价格、生物可降解性、适用范围,使更多水凝胶能走向临床,获得更广泛的应用
Modification of hydrogels is the necessary precondition of their applications in many biomedical fields. This paper summarized the modification of composit hydrogel of Polyvinyl Alcohol (PVA) and gelatin, protein hydrogel, nano hydrogel and other smart hydrogels. At the same time, it also points out that it is important to keep a close eye on biocompatibility, modified cost, biodegradability and application range of modified hydrogels, in order to put these hydrogels to clinical application, and obtain a wider range of applications.
不同移栽期对烟叶烘烤特性的影响
Effects of transplanting date on curing characteristics of flue-cured tobacco

,邓世媛,钟俊,
- , 2017,
Abstract: 【目的】探讨不同移栽期对烟叶烘烤特性的影响,为密集烘烤工艺的优化和完善提供理论依据。【方法】以始兴烟区常规移栽期(2月20日)为参照,设置4个不同移栽期处理,研究密集烘烤过程中不同移栽期烟叶的水分、叶绿素和类胡萝卜素、丙二醛(MDA)含量和多酚氧化酶(PPO)活性的变化状况及烤后烟叶的经济性状。【结果】移栽期对烟叶烘烤特性的影响十分显著。4个处理中,2月13日(提早移栽)、2月20日(常规移栽期)移栽的烟叶在烘烤过程中各观察阶段失水速率相对接近各自72 h内失水速率的平均值,失水均衡性好,且2个处理叶绿素在变黄期降解量较大(分别为92.38%,90.70%)、降解速率较快(分别为1.925,1.889 %/h),烟叶失水与变黄协调性较好。2月13日移栽的烟叶在烘烤过程中(PPO)活性保持最低(4.652 U/g),并且在定色初期温度升高时仍然保持最低的PPO活性(5.12 U/g);而2月27日移栽的PPO活性最高(6.242 U/g),在烘烤中易出现褐变现象,耐烤性较差。2月13日移栽的烟叶膜脂过氧化水平最低,MDA积累少且慢。在经济性状方面,随着移栽时间的推迟,各处理的产量逐渐增加,但是中上等烟的比例显著降低,其中2月13日移栽烟叶的产值(46 024.85元/hm 2)和中上等烟比例(86.78%)最高,经济效益最好。【结论】始兴烟区在传统移栽期基础上适当提早移栽(2月13日)可以改善烟叶烘烤特性,获得更好的经济性状;推迟移栽和过度推迟移栽的烟叶烘烤特性均较差,烟叶质量显著降低。
【Objective】This study investigated the effects of different transplanting periods on curing characteristics of flue-cured tobacco to provide reference for optimization and improvement of the bulk curing processing and to enrich the theory of flue-cured tobacco curing technology.【Method】A field experiment with 4 different transplanting dates was conducted in tobacco planting areas in Shixing with the local transplanting date (February 20) as reference.The changes of water content,chlorophyll,carotenoid,MDA content and PPO activity at leaf drying stage in the bulk-curing barn,as well as the economic characters of cured tobacco leaves were analyzed.【Result】The effect of transplanting date on baking characteristics of tobacco leaves was significant.Dehydrating rates of tobacco leaves transplanted in February 13 and those transplanted in local conventional date (February 20) at different stages during the curing process were closer to average of the whole process compared to others.Thus,the tobacco transplanted in February 13 and those transplanted in local conventional date had better dehydrating balance.The degradation of chlorophyll in tobacco leaves transplanted in February 13 and February 20 was larger (92.38% and 90.70%),and the degradation rate was faster (1.925 and 1.889 %/h),indicating better dehydrating and yellowing characteristics.During the curing process,PPO activity in the tobacco leaves transplanted in February 13 kept the lowest (4.652 U/g),while delayed transplanting leaves (transplanted in February 27) was the highest (6.242 U/g).The browning phenomenon also appeared premature and the resistance to baking was worse.Apart from this,the tobacco leaves transplanted in February 13 maintained a lower membrane lipid oxidation level with less and slower MDA accumulation.In terms of economic characters,as the transplanting time delays,the yield of each treatment increased gradually,but the ratio
一维分层弥散模型在二沉池模拟中的应用
,吴志,马民,顾国维
环境工程学报 , 2008,
Abstract: 通过在二沉池一维分层模型中加入弥散作用建立了二沉池一维分层弥散模型,并采用数值求解的方法开发了二沉池模拟程序。利用竖流式沉淀池中试试验实测数据验证了模型的可靠性,以COST(欧洲科技领域研究合作组织)624/682文件中基准污水处理厂二沉池晴天时的稳态和动态进水数据为模型输入值,分析比较了一维分层弥散模型模拟程序与国外成熟软件的模拟结果。结果表明,纳入了弥散作用的一维分层模型能较好地描述实际二沉池中的悬浮固体浓度分布,模拟结果具有较好的精度,有待于在二沉池模拟和控制领域进一步深入研究。
基于粗糙集理论的质量屋顾客需求分析技术
,马晓彬,吴军,
计算机集成制造系统 , 2007,
Abstract: 为解决质量屋的顾客需求信息中所存在的模糊性、不完整、不一致和冗余等问题,提出了基于粗糙集理论的顾客需求分析技术解决方案。该方案以数据仓库和数据挖掘技术为基础,存储、分析并处理已获得的顾客需求初始信息。利用分明矩阵启发式粗糙集约简算法来约简顾客需求信息规则,减少不必要的工程特性改动,降低产品设计与改进的成本和风险。借助J2EE架构与Oracle数据仓库,实现了约简算法,并验证了预期的效果。
我国城市污水处理现状调查
郭宇杰,王学,
环境化学 , 2015,
Abstract:
我国城市污水处理回用调查研究
郭宇杰,王学,
环境科学 , 2012,
Abstract: 在水利部主持下,开展了2007年全国城市污水处理回用现状的调查,取得了全国城市污水回用现状的基础数据.结果表明,2007年,全国城市污水回用总量为17.9×108m3,城市污水处理回用率为5.23%,主要用于工业、景观、农林牧业、城市非饮用水、地下水回灌.全国共有127座再生水厂,再生水管道总长1421.78km.再生水厂总投资为56.44×108元,中央财政投资、地方财政投资和其他投资分别占16%、26%和58%,再生水管网其他投资和地方财政投资分别为66%和32%,中央投资仅为2%.再生水发展状况具有较强的地域性,与当地的水资源状况、产业结构和经济状况有密切关系.
水平集超像素及贝叶斯框架下的显著性检测
陈炳才,,,陶鑫,
- , 2018, DOI: 10.11918/j.issn.0367-6234.201709032
Abstract: 针对数字图像显著性检测过程中对超像素的分割及相应显著值的计算不准确问题,提出了一种基于水平集超像素和贝叶斯框架的数字图像显著性检测和更新算法.首先,对基于灰度不均匀的水平集方法的结果先进行分割合并操作,可以得到适应图像不同区域大小的水平集超像素.其次,使用图像内部与边缘超像素之间的颜色和距离差异来构建显著性图.接着,使用水平集超像素来表示显著区域,以图像边缘部分的超像素为基础,基于K均值聚类算法并在贝叶斯框架下提出三种更新算法,用来更新显著性图从而得到显著性结果;更新算法可以进一步提高显著图的准确率、召回率、F值这3个指标,降低平均绝对误差.最后,提出了基于人脸识别的检测算法来处理包含有人的图片.在三个公开的数据库上进行了定性和定量的大量实验评测,结果表明本文提出的显著性检测方法和更新算法在准确率、召回率、F值及平均绝对误差这四个指标上均优于FT、CA、XL、MR、wCO、BSCA等已有的图像显著性检测经典算法.
Aiming at the inaccuracy of superpixel segmentation and the value calculation of saliency map in image saliency detection, this paper proposes an alternative form of saliency detection and updated algorithm based on the level set superpixels and Bayesian framework. A division or merger of the superpixels will achieve a level set method to form superpixels which are adaptive to the different regions of different size. The model's original map will be constructed by using color and space contrast between boundary and inner superpixels. The saliency region can be indicated with the level set superpixels and then three updated algorithms are effectively put forward via the Bayesian framework and based on K-means clustering algorithm. As a result of this update to the original mapping system, the final saliency result can be discovered in a manner that is a vast improvement of the existing method while still achieving a better level. Using our algorithm can improve the accuracy, recall rate, F value and reduce the mean absolute error value. Finally, this saliency detection algorithm for the face recognition can be effectively utilized to deal with the pictures containing people. The experimental results on three open databases show that our proposed algorithm is superior to FT, CA, XL, MR, wCO, BSCA and other saliency detection algorithms in accuracy, recall rate, F value and mean absolute error.
REGULARIZED TOTAL LEAST-SQUARES SOLUTION TO ILL-POSED ERROR-IN-VARIABLE MODEL
病态总体最小二乘模型的正则化算法

Yuan Zhenchao,Shen Yunzhong,Zhou Zebo,
,沈云中,泽波

大地测量与地球动力学 , 2009,
Abstract: Total least-squares method is preferrable to estimate the parameters in the linear observation models when both the observaion and designed matrix are contaminated by random errors.However,the conventional total least-squares solution cannot deal with the ill-posed problems,so the regularization algorithm must be used in this case.The formulas of regularized total least-squares solution based on Tikhonov regularization criterion are derived and the variance-covariance matrices of the estimated parameters ar...
GENETIC DIVERSITY OF DIFFERENT GEOGRAPHICAL POPULATIONS IN OCTOPUS VARIABILIS REVEALED BY ISSR ANALYSIS
长蛸(Octopus variabilis)不同地理群体遗传多样性的 ISSR 分析

郭宝英, ,,李继姬,吴常文
海洋与湖沼 , 2011,
Abstract: 利用 ISSR 分子标记技术获得长蛸的 ISSR-PCR 最优反应体系, 并对大连、烟台、青岛、连云港、舟山、温州、厦门 7 个群体 168 个个体进行遗传多样性分析。结果表明, 7 个引物在 7 个群体中共扩增出 118 条重复性好且带型清晰的 ISSR 扩增带, 其中多态条带为 55 条, 多态性比例达46.61%。 在物种水平上的 Nei’s 基因多样性指数和 Shannon’s 信息指数分别为 0.3145 和 0.4766, 在群体水平上分别为 0.1573 和 0.2355。7 个群体可明显聚类为 2 个类群, AMOVA 分子变异分析发现, 长蛸 54.64541%的变异发生在群体间, 45.35459%的变异发生在群体内。群体间的遗传分化系数 Gst 为0.5067 和由 Gst 估算的基因流 Nm 为 0.4867<1。分析显示长蛸具有较高遗传多样性水平, 但群体间已经出现了较大程度的遗传分化。
Cu-FeS复合材料导热性能的计算研究
于杰,陈敬,,晓龙
复合材料学报 , 2010,
Abstract: 为了研究质量分数为15%FeS的Cu-FeS自润滑材料内部结构与导热性能的关联,采用分子动力学的方法,在考虑界面热阻的情况下构建原子模型,对增强相和复合材料导热性能进行模拟研究。结果表明:FeS在600K、900K时会发生有利于热传导的结构变化,系统界面热阻随着FeS尺寸的增大而减小,颗粒大于100nm时,界面热阻趋于一定值。通过计算所得导热率与实验数值较接近,误差的引起是由于计算没有考虑温度升高对界面结合的破坏、界面的不完整性、基体内部缺陷、弥散相的大小等因素。验证了HasselmanJohnson方法对于预测该复合材料的合理性。
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