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Search Results: 1 - 10 of 22403 matches for " 万紫 "
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吐温80/正构醇微乳体系形成过程的介观模拟

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.8.029
Abstract: 利用耗散粒子动力学(DPD)方法对吐温80/正构醇(C2~C8)/丁酸乙酯/水四组分微乳体系形成过程进行了模拟,研究了醇类浓度及烃链长度对微乳形成过程相行为及微观结构的影响。研究发现:正构醇浓度和烷烃链长度对体系自组装形态变化有显著影响,当醇类浓度较低时,微乳粒径随醇浓度的增大而增大,当浓度增加到一定程度后,继续增加醇浓度则导致微乳形态从球状依次变为管道状、网格状;通过比较不同烷烃链长的微乳体系发生形态变化时醇的浓度大小,发现醇烷烃链长的增加促使微乳体系在醇浓度较低时就发生形态转变,且体系界面张力较快趋于稳定。同时,研究发现醇链长的增加会使吐温80/正构醇/丁酸乙酯/水体系的W/O型和双连续型微乳区增大。该结果为微乳类型及形态尺寸的调控从而实现蛋白质的选择性萃取提供指导。
The Tween80/n-alkanol (C2~C8)/ethyl butyrate/water four-component microemulsion system was simulated using the dissipative particle dynamics (DPD) method. Effect of n-alkanol concentration and n-alkanol alkyl chain length on the phase behavior and microstructure during the formation of microemulsion was also studied. The simulation results indicated that the concentration and alkyl chain length of n-alkanol greatly affected morphological changes in the self-assembly of the system. When the n-alkanol concentration was low, particle size of the microemulsion increased with an increase in alcohol concentration. After the n-alkanol concentration was increased to a certain extent, a further increase in concentration led to a change in the structure of microemulsion from spherical shape to pipe-like and net-like shapes. A comparison of the n-alkanol concentrations when morphological changes occurred in microemulsion systems with different alkyl chain lengths revealed that an increase in alkyl chain length of n-alkanol promoted morphological changes in the microemulsion system at low n-alkanol concentrations and the interfacial tension of the system stabilized rapidly. In addition, the results showed that increasing chain length of alcohol increased the water/oil (W/O) and bicontinuous microemulsion region of Tween80/n-alkanol (C2~C8)/ethyl butyrate/water system. This result provides guidance for the control of type, morphology, and size of the microemulsion system, to thus achieve selective extraction of proteins.
基于转化医学理念的病生理学教学改革探索与实践
Exploration and Practice of Teaching Reform of Pathophysiology Based on the Concept of Translational Medicine
 [PDF]

, 罗梓垠, 宋张娟,
Creative Education Studies (CES) , 2015, DOI: 10.12677/CES.2015.34017
Abstract:
目的:探讨以转化医学理念为指导的基础与临床相结合教学模式在病生理学教学中的应用。方法:选择我校2012级五年制医学本科生,在大班理论教学中开展综合式案例教学法,在小班理论教学中开展问题式案例教学法,在实验教学中开展综合开放性实验,病生理学教师参加临床(内科)实践,将转化医学理念运用到病生理学教学改革中,建立以转化医学理念为指导的基础与临床相结合的教学模式。结果:该教学模式进一步激发了医学生学习的兴趣,启发了学生的思维,提高了学生学习的主动性,培养了学生独立思考问题和解决问题的能力,同时提高了教师的教学水平,更好地发挥了本课程的基础–临床的桥梁作用。结论:基于转化医学理念的病生理学教学改革,提高了教学效果,值得进一步推广应用。
Objective: It aimed to investigate the application of the teaching mode in Pathophysiology, which was based on the thought of Translational Medicine and combined Basic Medicine with Clinical Medicine. Methods: We chose the five-year period medical undergraduates in our university, who enrolled in the year of 2012, developed comprehensive case-based teaching (CCBT) in large class teaching, had Case-Problem Based Learning (CPBL) in small class teaching, and carried out comprehensive open experiments during the experiment teaching. The pathophysiology teachers participated in clinical (internal medicine) practice. We also applied the concept of Translational Medicine into the Pathophysiology teaching reform and set up a teaching mode which was based on the thought of Translational Medicine and combined Basic Medicine with Clinical Medicine. Results: This model of education further stimulated students’ interest in study, enlightened their creative thought, enhanced the initiative of students greatly and raised students’ abilities to think and solve problems independently. At the same time, it improved the teachers’ teaching level, and made this curriculum served as a bridge between Basic Medicine with Clinical Medicine. Conclusion: The pedagogical reform of Pathophysiology which was based on the idea of Translational Medicine improved educational effect and was worthy to be applied further.
基于支持向量机工具的性能劣化建模方法
邓超,吴军,
计算机集成制造系统 , 2009,
Abstract: 针对基于故障数据的数控装备可靠性研究中的小样本问题,提出了建立基于支持向量机的性能劣化模型。在研究支持向量机的建模理论和参数优化方法的基础上,将最小二乘法支持向量机工具LSSVM.M应用于性能退化数据处理,提出一种改进的参数选择方法,以提高拟合和预测准确性。通过实例,验证了该方法的可行性,并建立了数控机床加工精度的性能劣化模型,为可靠性评估奠定了基础。
铂/石墨烯氧还原电催化剂的共还原法制备及表征
,
物理化学学报 , 2012,
Abstract: 使用硼氢化钠共还原法制备40%(w)铂/石墨烯电催化剂用于氧还原反应.通过循环伏安测试发现,这种方法制备所得铂/石墨烯催化剂对氧还原反应活性较铂/碳催化剂差,但稳定性有所提高.在稳定性测试中,铂/石墨烯电催化性能衰减为50%,较铂/碳(79%)好.x射线衍射(xrd)和透射电子显微镜(tem)表征发现在铂/石墨烯催化剂中两者存在明显交互作用,这可能是阻止石墨烯再堆垛和防止铂颗粒团聚的主要原因.通过对单电池性能测试也发现铂/石墨烯催化剂更有利于电池长期稳定.
双视向补偿最佳入射角组合研究
王国军,邵芸,,张风丽
国土资源遥感 , 2012, DOI: 10.6046/gtzyyg.2012.04.09
Abstract: 为了解决高分辨率合成孔径雷达双视向补偿的最佳入射角组合问题,提出了一种基于数据模拟的最优化选择方法。该方法利用DEM数据模拟2个视向不同入射角下的叠掩和阴影掩模图像,用补偿效果作为评价函数选择最佳的入射角组合。将该方法应用于地形平缓、适中和陡峭3个实验区的结果表明,该方法可以快速有效地获得最佳入射角组合,为双视向补偿应用中的SAR图像数据订购提供了科学依据,是SAR图像双视向补偿不可或缺的环节。
有关中药丸剂的一些进展概况
忻丁烯,里扬,
中国中药杂志 , 1985,
Abstract: 中国药典(1977)收载中成药制剂270个品种,其中丸剂占58.8%。丸剂在中成药中占重要地位。本文对中药丸剂近十年来有关生产工艺、生产设备、药理研究和质量标准等几个方面的进展情况作了概述。
基于RADARSAT-2数据的SAR图像双视向几何校正方法研究
,邵芸,谢酬,张凤丽
红外与毫米波学报 , 2011,
Abstract: 针对山区高分辨率雷达卫星Radarsat-2图像的严重几何变形,提出了一种新的双视向雷达图像几何校正方法.实验证明该方法可以有效祛除地形引起的各种几何变形,防止地形引起的后向散射系数的失真,特别是能够有效祛除叠掩和阴影的影响,而这个问题是基于单幅雷达图像的传统几何校正方法无法解决的.为合成孔径雷达(SAR)图像在山区的推广应用提供了重要手段.
基于有符号数字系统的Montgomery模逆算法及其硬件实现
陈琳,,陈性元,
电子学报 , 2012, DOI: 10.3969/j.issn.0372-2112.2012.03.013
Abstract: 在椭圆曲线密码中,模逆运算是有限域运算中最复杂、最耗时且硬件实现难度最大的运算.本文在Kaliski算法的基础上,提出了基于有符号数字系统的Montgomery模逆算法,它支持素数域和二进制域上任意多精度参数的求模逆运算.据此算法,设计了相应的硬件结构方案,并给出了面积复杂度和时间复杂度分析.仿真结果表明,相比于其它模逆算法硬件设计方案,本文提出的基于有符号数字系统的Montgomery模逆算法在运算速度、电路面积、灵活性等方面具有显著的优越性.
Synthesis of multi-source remote sensing data for classification based on Bayesian theory and MRF
结合贝叶斯理论和MRF的主被动遥感数据协同分类

YU Fan,LI Haitao,WAN Zi,
余凡
,李海涛,

遥感学报 , 2012,
Abstract: The iterative technique for multi-source remote sensing data classification is presented in accordance with the advantages of multi-source data in feature extraction. In the method, the Advanced Synthetic Aperture Radar (ASAR) backscatter coefficient is normalized by the incident angle at first. Then, a classifier based on the Bayesian theory and Markov random fields (MRF) is developed, and the Vertical-Vertical, Vertical-Horizontal (VV, VH) polarizations of ASAR and all the seven TM bands are used as inputs of the classifier to get the class labels of each pixel of the images. Finally, the method is validate, the necessities of normalization and integration of TM and ASAR are discussed. The results show that the precision of classification in this paper is 89.4%, which is increased by 4.1% and 11.5% compared with the methods of without normalization and using single TM data. These analyses illustrate that synthesis of multi-souce remote sensing data is an efficient classification method.
多时相全极化SAR数据融合方法与土地覆盖分类研究
谢酬,,徐茂松,夏忠胜,张风丽
国土资源遥感 , 2010, DOI: 10.6046/gtzyyg.2010.03.24
Abstract: ?结合多时相和全极化SAR数据在地表覆盖分类中的优势,通过融合多时相全极化SAR数据,降低雷达图像上斑点噪声的影响,开展土地覆盖分类研究。以贵州扎佐林场大约12km×17km的区域为研究区,使用6个不同时期的RADARSAT-2全极化数据进行地表覆盖分类研究。研究结果表明:不同地物的后向散射机制有很大区别,且对应的后向散射系数随时间的变化规律也各不相同;该方法能有效区分人工建筑、森林、农田和水体等地物,斑点噪声得到有效抑制,图像质量,特别是视觉效果大为改善。
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