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Search Results: 1 - 10 of 83191 matches for " 孙圣楠 "
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溶胶-凝胶法制备TiO2负载活化半焦光催化烟气脱硝
,李春虎,杨微微
分子催化 , 2015,
Abstract: 利用超声辅助溶胶-凝胶法,以钛酸正丁酯为钛源,制备了TiO2负载于活化半焦的光催化剂。考察了TiO2负载量,煅烧温度和时间,以及水对光催化脱硝活性的影响。利用X射线衍射(XRD),BET,FT-IR,扫描电镜(SEM)以及能谱分析(EDS)等方法对催化剂进行了表征分析。实验结果表明,TiO2负载量为5.22 %,煅烧温度500 ?,煅烧时间为1 h时,TiO2/SC光催化脱硝剂效果最好,反应3小时后脱硝率仍高于70 %。通过添加自由基捕获剂的方法确定TiO2/ASC光催化脱硝过程中起主要作用的活性物种为?OH和?O2-,而空穴在本实验的光催化过程中几乎不起作用。对催化剂的再生研究发现,高温(400?)水热一次再生可恢复催化剂脱硝活性至新鲜催化剂的100%,三次再生效果仍为新鲜催化剂脱硝率的80%。
基于3D-CT图像的髋脱位定量智能诊断方法
李宏,,,潘诗农
- , 2018, DOI: 10.12068/j.issn.1005-3026.2018.02.009
Abstract: 摘要 根据正常状态下股骨头与髋臼月状面所在球面同心的原理,结合三维图像分割与球面拟合两种主要思想以及细节的算法处理,提出一种有效的髋脱位定量辅助诊断方法.首先将髋臼与股骨头三维分割,获取各自的独立数据;提取髋臼与股骨头表面数据并剔除误差点后,利用最小二乘法分别拟合出股骨头表面和髋臼月状面所在的球面,并通过两球面的球心距数值确定髋臼是否脱位.实验结果表明,此方法判断结果有效,同时可计算出髋臼复位需要移动的距离,提高诊断精度.
Abstract:Considering that the spherical surface of the femoral head should be approximately concentric with that of the acetabulum, an effective method based on three dimensional image segmentation and spherical surface fitting was proposed, with some detailed algorithm designed. First, the three dimensional segmentation was implemented on the femur and acetabulum to obtain respective independent data. After extracting the valid data of the femoral head and acetabulum boundary and removing the error points, the least square method was applied to fit the spherical surface of the femoral head and the surface of the acetabulum. Then the respective sphere center distance between two spherical surfaces was calculated, thus determining whether the acetabulum is dislocated or not. The results of experiments show that the method proposed can provide the distance for hip replacement and improve the diagnostic accuracy.
多级闪蒸海水淡化系统的优化设计
伍联营,肖胜,,,张建军
华东理工大学学报 , 2009,
Abstract: 在考虑盐水温度、质量浓度等物性参数的基础上,对多级闪蒸海水淡化系统进行了优化设计,建立了严格的数学模型。引入了热回收段级数、热排放段级数和盐水循环比3个变量,以年度费用最小为目标函数,运用混合遗传算法进行求解,并给出了1个算例分析。
MSLB事故对主控制室剂量影响研究
Study on the Influence of MSLB Accident on Main Control Room Dose
 [PDF]

大威,, 张姗姗
Nuclear Science and Technology (NST) , 2015, DOI: 10.12677/NST.2015.34018
Abstract: 本文深入的阐述了AP1000主蒸汽管道破裂事故(MSLB)剂量分析基本方法,介绍了一回路、二回路初始放射性释放及碘尖峰释放三种方式的源项计算模型。以AP1000滨海厂址为例,分别评估了MSLB事故后应急可居留系统(VES)模式和非放射性通风系统(VBS)新风过滤模式投入情况下主控制室(MCR)内工作人员的剂量,其剂量结果均可满足HAD 002/01-2010限值要求,事故后主控制室具有良好的可居留性。同时,针对VES投入情况下主控制室剂量影响参数,开展了详细的敏感性分析。研究结果表明,二回路初始存在的碘及碱金属对剂量贡献最大;MCR剂量主要来自于0.052~4 h时间段,由VBS正常通风引入的放射性所产生;破损SG喷放时间、VES模式开始时间、MCR内循环风量为剂量敏感参数,MCR内渗透率、辅助风机风量为剂量不敏感参数。相关研究结论可为优化主控制室设计提供必要的理论参考。
In this paper, main steam line break (MSLB) accident dose assessment method on AP1000 is ela-borated, and three types of radiation source term analysis models are expounded, involving the primary coolant initial activity release, secondary coolant initial activity release and iodine spike release. Based on the AP1000 coastal site, the main control room (MCR) personal doses are eva-luated, during operation of emergency habitability system (VES) mode and nuclear island nonra-dioactive ventilation system (VBS) supplemental air filtration mode, respectively. All the above results can meet the requirement of HAD 002/01-2010, and the main control room has good habi-tability. Meanwhile, detailed parameter sensitivity analysis is performed for MCR dose based on VES mode. Research results have shown that the initial secondary iodine and alkali metals release makes the largest contribution to MCR dose, and the MCR dose mainly results from the VBS normal operation mode activity introduction during the period of 0.052~4 h. The blowdown period of SG, beginning time of VES mode, and recirculation flow are the sensitive parameters to MCR dose, but the in-leakage rate and auxiliary fan flow are insensitive parameters. These research conclusions could provide necessary theory reference to MCR design optimization.

法国当代作家让·艾什诺兹的符号化写作

华东师范大学学报(哲学社会科学版) , 2015, DOI: 10.16382/j.cnki.1000-5579.2015.04.019
Abstract: 让·艾什诺兹是法国当代著名小说家,他的作品以风格取胜,其中符号化是其突出特征。艾什诺兹以物品符号的共时性堆积表现静态的物的世界,用以承载丰富的文化信息,展现了一种高超的符号管理艺术;利用兼具共时和历时性质的符号场景,呈现了符号的飘荡与暂停形成的动静结合;并最终上升到以零符号和体裁符号为代表的符号历时性组合,从而在三个层次上构建了整个符号帝国。艾什诺兹的符号化写作不仅构筑了一个真实的今日世界,同时也获得了独立的存在价值。
突破性技术创新识别的灰色模糊综合评价模型

科技进步与对策 , 2009,
Abstract: 综合考虑突破性技术创新识别评价过程中信息的不完全性以及评判者思维的模糊性,根据灰色模糊数学基础理论和常用的灰色模糊评判方法,建立了识别突破性技术创新的灰色模糊综合评判模型,为企业识别突破性技术创新提供科学的依据与方法。突破性技术创新灰色模糊综合评判创新模式
高校技术服务系统研究

科技进步与对策 , 2001,
Abstract: 我国高校一直是科研中的重要力量,但长期以来,高校科技成果的转化率低,科技与经济严重脱节。通过探讨现有科技成果转化服务模式的现状及不足,用系统观的思想,建立适合我国高校特点的科技成果转化服务系统,旨在促进高校科技成果转化。中国高校科技成果转化服务系统技术服务系统
不同钙片产品体外快速持钙活性与原子吸收法测定含钙量的比较研究

- , 2017, DOI: 10.13982/j.mfst.1673-9078.2017.12.015
Abstract: 酪蛋白磷酸肽(CPP)是从牛乳酪蛋白中水解分离所得到的一种生物活性肽,具有很强的促钙吸收活性。本实验考察CPP抑制磷酸钙/碳酸钙沉淀的产生,来表征CPP的持钙效果。对市售三种钙片体外持钙活性进行了体外快速演示实验和利用原子吸收法测定含钙量的比较和研究,结果表明含CPP的钙片具有较明显的持钙优势,阻止磷酸钙/碳酸钙聚沉时间可达30 min以上。在相同钙片重量和相同钙含量的情况下,加有CPP的钙片在水中溶解后的沉淀明显少于另外两种钙片产品,上清液加入碳酸钠溶液中,沉淀明显较多于另外两种钙片,表明了CPP具有明显延长持钙时间、有效抑制碳酸钙沉淀生成的作用。这一研究发现为市场上钙片产品补钙效果提供了有理有据的科学支撑,对保健品行业健康稳健的发展具有重大指导意义。
Casein phosphopeptide (CPP), hydrolyzed and separated from milk casein, was a bioactive peptide and had a strong calcium absorption activity. The inhibition of calcium phosphate/calcium carbonate precipitation was investigated by CPP to characterize the calcium-holding effect of CPP in the present study. The calcium-holding activity of three commercial calcium tablets was investigated by rapid demonstration experiments in vitro, and the comparison of calcium content was determined by atomic absorption spectrometry. The results showed that the CPP-containing calcium tablets had an obvious advantage of calcium-holding and prevented calcium phosphate/calcium carbonate from precipitating for more than 30 minutes. In addition, the precipitation of CPP-containing calcium tablets was significantly less than the other two calcium products under the conditions of same calcium tablets content and calcium content while greatly more than the other two calcium tablets after treated with sodium carbonate solution, indicating that the CPP-containing calcium tablets had a significant effect on prolonging time calcium-holding and inhibiting the formation of calcium carbonate precipitation. The results of this study provided a reasonable scientific support for the calcium supplement effect of commercial calcium products and had a great guiding significance to the stable development of the health care industry.
复合增塑剂聚乙二醇200与甘油对淀粉/PHA复合膜性能的影响

- , 2017, DOI: 10.13982/j.mfst.1673-9078.2017.3.026
Abstract: 本文以羟丙基交联木薯淀粉、聚羟基脂肪酸酯(PHA)为成膜基材,甘油(GLY)为主增塑剂,聚乙二醇200(PEG200)为辅增塑剂,有机改性蒙脱土(OMMT)为增强剂,采用挤压吹塑法制备淀粉/PHA复合膜。研究了PEG200与GLY质量比对淀粉/PHA复合膜性能的影响。采用X-射线衍射(XRD)、扫描电镜(SEM)和红外光谱(FT-IR)分别对膜的结构、微观形貌和分子间相互作用进行了表征,并测试了膜的水蒸气阻隔性、机械性能、透光率和色度。结果表明,主增塑剂甘油对淀粉/PHA共混体系具有较好的增塑效果,且随着辅增塑剂PEG200的加入,促进了淀粉、PHA分子与OMMT间纳米插层结构的形成,所成复合膜表面较为平整光滑,且透光率、白度值增加;当PEG200与GLY质量比为8/92时,所成复合膜阻水性较好,具有较高的断裂伸长率;当PEG200与GLY质量比为12/88时,所成复合膜具有较高的抗拉强度和透光率;辅增塑剂PEG200的添加能够增强各分子间的相互作用。在制备淀粉/PHA复合膜中,PEG200是一种较好的增塑剂和增容剂,PEG200与GLY的质量比不宜超过12/88。
Starch/polyhydroxyalkanoate (PHA) composite films were prepared using the blown film extrusion method with hydroxypropylated crosslinked tapioca starch and PHA as the film-forming substrate, glycerol (GLY) as the primary plasticizer, polyethylene glycol 200 (PEG200) as the secondary plasticizer, and organically modified montmorillonite (OMMT) as the enhancer. The effect of weight ratios of PEG200/GLY on the properties of the composite films was evaluated. The structure, microstructure, and molecular interactions of the films were analyzed by X-ray diffraction, scanning electron microscope, and Fourier transform infrared spectroscopy, respectively. The water vapor barrier properties, mechanical properties, light transmittance, and color of the films were also measured. The results showed that the primary plasticizer GLY had a good plasticizing effect on the starch/PHA blend systems. Moreover, the addition of PEG200 facilitated the formation of intercalated nanostructures between starch, PHA, and OMMT, and increased the light transmittance and whiteness values of the composite films. Additionally, the surface of the composite films became flat and smooth. When the weight ratio of PEG200/GLY was 8/92, the composite films showed good moisture barrier properties and high elongation at break. When the weight ratio of PEG200/GLY was 12/88, the composite films showed a high tensile strength and good light transmittance. The addition of the secondary plasticizer PEG200 enhanced intermolecular interactions. During the preparation of starch/PHA composite films, PEG200 was a preferable compatibilizer and plasticizer, and the weight ratio of PEG200/GLY should be less than 12/88.
伏牛山森林生态系统灌木植物功能群分类
,范玉龙?,彦*?
生态学报 , 2009,
Abstract: 伏牛山国家级自然保护区位于中国东部亚热带和暖温带的过渡区,植被优势种明显,以灌木优势种为主体进行植物功能群分类,可以对森林生态系统的功能、框架结构及类群分布有一个明确的认识。采用群落生态学的调查方法,在伏牛山南北坡设置66个典型样方。根据调查结果,通过计算重要值,选取优势度相对较大的灌木树种进行种间联结及相关性分析,以x2(卡方)检验为基础,结合联结系数ac和共同出现百分率pc来测定灌木优势种间的联结性,根据优势种间的联结性及其在海拔梯度上的变化异同来划分植物功能群,把灌木优势种划分为7组植物功能群。植物功能群间物种表现出显著正联结,一起在同一生境中出现的几率较大,在长期的生长演化过程中,能适应相似的资源环境和对干扰有相似的响应,所以将其划分同一组植物功能群。植物功能群内有一些重要的形态特征有相似之处,功能群间的形态特征有明显的区别,如叶片的大小、形状等,功能群的这些相似及区别还需要生理生态学的进一步研究。
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