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Search Results: 1 - 10 of 319747 matches for " 王樟凤 "
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水热法合成在可见光照射下具有高催化活性的纳米TiO2催化剂
唐培松,,周时,樊先平,民权
催化学报 , 2004,
Abstract: ?以丙酮为溶剂,采用水热法在240℃合成了表面吸附有机物的纳米TiO2粉体光催化剂,并采用XRD,TEM,UV-Vis和DRS等技术对催化剂进行了表征.结果表明,合成的纳米TiO2催化剂在可见光激发下具有良好的光催化降解甲基橙的性能和较好的热稳定性.经180,250和365℃热处理后,催化剂的晶型和尺寸没有变化,但催化剂表面吸附的有机物发生了明显变化.催化剂表面吸附的有机物、可见光波段的光响应性能和可见光下催化降解甲基橙的效率之间存在良好的关联性,催化剂表面吸附适量的有机物可提高纳米TiO2催化剂在可见光波段的光响应性能,从而提高其在可见光照射下催化降解甲基橙的性能.
用X射线衍射评价硅基碲镉汞分子束外延材料及优化其生长条件研究综述

红外 , 2003,
Abstract: 1 引言 碲镉汞(Hg_(1-x)Cd_xTe)三元合金化合物半导体是一种重要的红外材料。人们可以通过调节其组分x值的大小连续改变其禁带宽度(从Oev~1.6eV),从而获得几乎覆盖整个红外区域的响应波长。用它制备的红外探测器在军事、民
0.14thz瓦量级折叠波导行波管设计
,亚军
强激光与粒子束 , 2013,
Abstract: ?在本课题组此前采用显式方法设计0.14thz宽带折叠波导慢波结构的基础上,设计了一种0.14thz瓦量级输出折叠波导行波管。通过cstmws软件分析结构尺寸对冷测特性的影响规律来确定一组慢波结构参数,然后对电子枪、永磁聚焦系统、输入输出结构、衰减结构及收集极系统进行设计,最后经过cstps软件进行整管热测特性仿真模拟。此过程不断迭代,最终找到一组结构参数满足频率在0.14thz、输入功率为20mw时,折叠波导行波管输出功率大于6w。为了验证设计的电子光学系统的正确性,加工装配了一根流通管,并进行了流通率测试,测得流通率大于80%。
Comparative study of SNP diversity and calculation of the effective size of population in chicken
鸡SNP多样性的比较研究与群体有效规模的估算

RAO You-Sheng,WANG Zhang-Feng,ZHOU Min,SHEN Xu,XIA Meng-Na,ZHANG Xi-Quan,
饶友生
,,周敏,沈栩,夏梦娜,张细权

遗传 , 2007,
Abstract: A region (200 kb) of Contig. 060226.1 on GGA1 was selected to study the average diversity of Red Jungle Fowl (RJF), Taihe Silk chicken (TS), and White Recessive Rock (WRR), and estimate the effective population size (Ne) of chicken. The mean heterozygosities of RJF, TS and WRR were 0.28533+/-0.034747, 0.32926+/-0.039191 and 0.30168+/-0.040382, respectively. Significant test indicted that there is not significant difference between them (P=0.2368>0.05). The initial chicken effective population size was estimated to be about 20 000-150 000. Chicken has undergone serious population bottleneck effect during the first stage of domestication. However, this bottleneck effect did not result in a substantial loss of diversity as revealed by SNP. The possible explanations for similar SNP diversity between domesticated chicken and Red Jungle Fowl might due to many factors, such as a big Ne in earlier phase of domestication, population expending in breed differentiation, abroad crossing between breeds (especially crossing with RJF), together with high recombination rate in chicken genome.
空间可扩展视频编码中增强层上的帧内预测算法研究
,柳健,田金文
中国图象图形学报 , 2008, DOI: 10.11834/jig.20080402
Abstract: 针对空间可扩展视频编码,提出了一种新的增强层上的帧内预测算法。该算法充分考虑了相邻层间所固有的空域相关性,在无法正确获取本层邻块预测值的情况下,利用基本层上插值放大后的解码,通过重构宏块来对增强层上的编码宏块进行帧内预测。此外,还在预测过程中,通过引入与图像纹理特征相关联的自适应加权因子对(?W??v,?W??h)来进一步提高新算法的编码性能。实验结果表明,与H.264标准中的帧内预测算法相比,新算法在保持原有码率和不增加额外的计算复杂度的前提下,可一定程度地提高亮度分量的PSNR值,因此可以作为空间可扩展视频编码中增强层上的帧内编码方案。
高强度聚焦超声用于肿瘤治疗的研究
钱盛友,鸿
物理 , 2000,
Abstract: ?高强度聚焦超声(hifu)能在短时间内使病变组织的温度升至70℃以上,导致病变组织凝固坏死,是一种具有巨大潜力的、非侵入的、有效的肿瘤治疗手段.本文对hifu的动物试验、临床应用及治疗装置的研究情况进行了总结,分析了该技术尚存在的问题,最后展望了其应用前景.
渤海蓬莱9-1中生代花岗岩储层特征及有利区带分析
Reservior Characteristics of Mesozoic Granite in Penglai 9-1 and Prediction of Potential Development Area
 [PDF]


Open Journal of Nature Science (OJNS) , 2015, DOI: 10.12677/OJNS.2015.34024
Abstract:
渤海湾盆地蓬莱9-1油田潜山勘探获得重大突破,在花岗岩中见到较好油气显示,单井试油获得工业油气流。然而,对该套花岗岩的形成时代、产状、分布规模、岩性特征、储集空间类型、储层主控因素等并不十分清楚。本文通过对潜山钻井取心、井壁取心、岩屑的系统观察、描述以及选取样品进行单颗粒锆石U-Pb同位素定年、岩相学鉴定等测试,确定该花岗岩为中生代时期的侵入到元古宇地层中的酸性侵入体。进一步采取铸体薄片鉴定、物性分析等测试手段确定储集空间类型为破碎粒间孔、溶孔、风化收缩缝、构造裂缝等,主要以潜山风化壳油气藏为主,风化花岗岩中下部孔隙和裂缝发育较差,横向非均质性强,为岩性油气藏模式。结合测井和地震等手段,对侵入体侵入方向、侵入规模等进行了研究,为花岗岩体储量申报奠定了扎实的基础,同时,对类似蓬莱9-1花岗岩体以及结晶基岩有利储层分布研究,具有重要的借鉴意义。
We made major breakthroughs in exploration in buried hills of Penglai 9-1 oilfield in Bohai basin. There is good oil-gas show in granite, which already forms oil-gas pools. However, there are some uncertainties in this set of granites, such as forming time, attitude, distributing scope, lithology characteristic, reservoir space types, major controlling factor of reservoir and so on. Systematic observation, description of drilling cores, sidewall cores and cuttings, zircon U-Pb dating, petrography and geochemistry studies show that the granite is a Mesozoic acid intrusion in Proterozoic strata. The analyses such as casting thinsection observation and physical property analysis show that the reservoir space types in the granite are broken intergranular pores, dissolution pores, weathering fractures, structural fractures, etc. and it is mainly a pool of weathering crust which is strongly transverse homogeneous lithologic petroleum reservoir whose lower cores and fractures develop badly. Combined with logging and seismic method, we also studied the intrusive direction and scale of the granite, which built solid foundation for declaring the reserves of oil and gas in the granite and had instructive meanings for the study of reservoir distributing in the similar Penglai 9-1 granites and crystal basement rock.
浅谈导游自由执业的监管问题
Study on the Institutional Guarantee of Freelance Tour Guide
 [PDF]

,
Service Science and Management (SSEM) , 2016, DOI: 10.12677/SSEM.2016.55016
Abstract:
目前游客呈个性化和散客化趋势明显,导游自由执业的创新改革,不仅顺应了市场的需求,也有利于缓解一直紧张的游客与导游的关系。但是导游自由执业并非完全自由,伴随着游客的合法权益保障、导游公共服务监管平台的搭建、导游自由执业在法律层面的制度改革和导游市场秩序的管控等一系列监管问题亟待解决。
Currently, the trend of tourists that are personalized and individual is obvious, and the reform of innovative freelance tour guide not only conforms to the needs of the market, but also helps ease relations which have been strained between tourists and guides. However, freelance tour guide’s practice is not entirely free, with the ensuing problems such as the protection of legitimate rights and interests of tourists, building the regulatory public service platform for guides, other legal aspects of the reform of freelance tour guide and control of guide market’s order are a series of regulatory issues to be solved.
铁基合金的纵向驱动非对称巨磁阻抗效应
The Longitudinally Driven Asymmetric Giant Magneto-Impedance Effect in Fe-Based Alloy
 [PDF]

杨光, 何兴伟, 范晓珍, 周初凯, 赵静, 红洲, 肖飞, 方允
Advances in Condensed Matter Physics (CMP) , 2014, DOI: 10.12677/CMP.2014.31001
Abstract:
研究了直流电流退火的Fe73.5Cu1Nb3Si13.5B9合金薄带的巨磁阻抗效应,实验发现,经0.72 A电流退火10 min后,样品巨磁阻抗比有最大值1810.4%。经0.74 A电流退火10 min后,样品由于自身存在偏置场,其巨磁阻抗效应开始出现零磁场的非对称现象,结合XRD图谱分析表明,样品非对称巨磁阻抗效应的产生与B6-Fe23硬磁相的析出有关。
We have investigated the giant magneto-impedance effect ofFe73.5Cu1Nb3Si13.5Balloy ribbons which were annealed by DC current. It was found that the maximum GMI ratio was 1810.43% after 10-min annealing current of 0.72 A. However, the GMI effect began to show asymmetric phenomenon around zero magnetic field after 10-min annealing current of 0.74 A in terms of its own existence bias field. XRD spectrum analysis indicated that the B6-Fe23 hard magnetic phase precipitated should be responsible for the asymmetric giant magneto-impedance effect.
电动汽车复合制动防抱死系统研究
Study on Hybrid Anti-lock Braking System in Electric Vehicle

陈综合,陈庆,正义,
- , 2018,
Abstract: 为实现电动汽车制动防抱死控制,设计了电动汽车复合制动防抱死系统。首先建立了液压与电机制动防抱死模型;然后根据路面附着系数大小设计出复合制动防抱死控制模式;最后基于模糊PID控制设计了复合制动防抱死系统。在MATLAB/Simulink环境下同时建立复合制动与液压制动防抱死仿真模型,进行对比分析,结果表明:在不同附着系数路面,复合制动均能够有效控制滑移率,缩短制动时间和距离,回收制动能量;在对接路面,复合制动的控制效果更加理想,系统反应迅速、鲁棒性好。
In order to achieve anti-lock control of electric vehicle, a hybrid anti-lock braking system in electric vehicle is presented. Firstly, the models for hydraulic and motor anti-lock braking are established; secondly the hybrid anti-lock braking control mode is designed, according to the size of tire-road adhesion coefficient; finally, the hybrid anti-lock braking system is designed, based on the fuzzy-PID control. The simulation models for hybrid and hydraulic anti-lock braking are built simultaneously in MATLAB/Simulink in order to make comparative analysis, and the result shows that:on the different adhesion coefficient road, the hybrid braking can effectively control the slip ratio, shorten the braking time and distance, and recover the braking energy; on the joint-adhesion road, the hybrid braking can achieve an ideal control effect, and the system has rapid response and good robustness
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