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71.
KIM Yong-deak 《浙江大学学报(A卷英文版)》2006,7(5):857-863
INTRODUCTION With the expansion of multimedia applications, video transmission is becoming an important issue in the research area of communication. It is very im- portant to compress a large amount of video data effectively, which has already attracted considerable attention recently. To make source coders both er- ror-resilient and network-adaptive are two main challenges facing the video compression techniques. It is necessary to make the bitstreams temporal, spa- tial and SNR scalabl… 相似文献
72.
1 Introduction a Zinc Oxide (ZnO), a II-VI compound semiconductor with a wide direct band gap of about 3.4 eV [1], has been extensively studied in recent time for their possible applications in short-wavelength light-emitting devices [2], surface wave dev… 相似文献
73.
第二届中韩几何设计与可视计算双边学术会议于2006年8月23日至25日在中国杭州举行,由浙江大学负责承办。计算机辅助几何设计与计算机图形学是当代高技术学科之一,其主要内容是对几何外形信息的计算机表示、显示、分析、设计与综合。应用范围除了航空、造船、汽车这三大制造业外,还深入到机械制造、建筑、地形地貌、生物工程、医疗诊断、航天材料、电子工程、机器人、军事作战、计算机视觉、服装鞋帽、电影动画、多媒体技术等高技术领域,涉及计算机辅助设计、辅助制造、辅助工程、辅助工艺计划编制(CAD/CAM/CAE/CAPP)的一体化与网络化… 相似文献
74.
Hui PAN Bao-hui WANG Zhou-bin LI Xing-guo GONG Yong QIN Yan JIANG Wei-li HAN 《Journal of Zhejiang University. Science. B》2019,(4):310-321
目的:通过细胞外过氧化氢(H_2O_2)的刺激建立单个人肺癌SPC-A-1细胞的氧化压力模型。创新点:氧自由基(ROS)涉及多种生物现象,包括有益和有害两个方面。ROS的定量检测和反应网络的评估结果令人期待。但ROS半衰期很短且反应过程很快,因此,我们通过多种手段克服了检测和评估的困难。方法:利用改进的微流控和成像技术测定ROS水平,构建氧反应网络。通过调控线粒体胞浆Ca2+水平、线粒体Ca2+摄取、细胞内ROS自扩增以及内在凋亡途径,确定线粒体在外源氧化压力模式中扮演的角色。结论:研究结果表明1 mmol/L H_2O_2引起细胞O_2·-水平的快速增加,从而导致细胞氧化能力增加和还原能力降低。此外,研究还证实了内质网中储存的Ca2+是H_2O_2诱导的线粒体Ca2+爆发的主要来源。外源氧化压力反应涉及细胞器间Ca2+信号的传递、ROS自身扩增、线粒体功能紊乱和半胱天冬酶依赖性凋亡途径。线粒体在外源性氧化应激影响细胞命运方面发挥着关键作用。 相似文献
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Fluidized-bed pyrolysis of waste bamboo 总被引：1，自引：0，他引：1
XIAO Gang NI Ming-jiang HUANG He CHI Yong XIAO Rui ZHONG Zhao-ping CEN Ke-fa 《浙江大学学报(A卷英文版)》2007,8(9):1495-1499
Bamboo was a popular material substituting for wood,especially for one-off commodity in China. In order to recover energy and materials from waste bamboo,the basic characteristics of bamboo pyrolysis were studied by a thermogravimetric analyzer. It implied that the reaction began at 190～210 °C,and the percentage of solid product deceased from about 25% to 17% when temperature ranged from 400 °C to 700 °C. A lab-scale fluidized-bed furnace was setup to research the detailed properties of gaseous,liquid and solid products respectively. When temperature increased from 400 °C to 700 °C,the mass percent of solid product decreased from 27% to 17% approximately,while that of syngas rose up from 19% to 35%. When temperature was about 500°C,the percentage of tar reached the top,about 31%. The mass balance of these experiments was about 93%～95%. It indicated that three reactions involved in the process: pyrolysis of exterior bamboo,pyrolysis of interior bamboo and secondary pyrolysis of heavy tar. 相似文献
76.
葛兰西的文化领导权思想是在其实践哲学基础上提出的配合无产阶级革命的具体理论,它是对马克思主义意识形态学说的继承和发展。他认为任何社会集团要想获得和维护政治领导权就必须首先占有文化领导权,而文化领导权的占有,主要是通过社会中的知识分子阶层来实现的。因此,教育和培养自己的知识分子阶层是无产阶级革命的必备条件之一,要实现这一目的就必须使知识分子自觉地同人民群众紧密地联系在一起。 相似文献
77.
Yong ZHOU 《Frontiers of Education in China》2013,8(1):162
Barry C.Keenan has been acknowledged as an influential American Sinologist since his doctoral dissertation entitled The Dewey Experiment in China:Educational Reform and Political Power in the Early Republic was published by Harvard University Press in 1977.His deft approach to the sociological history of Chinese education was further exemplified in his second monograph,Imperial China's Last Classical Academies:Social Change in the Lower Yangzi,1864-1911,published by the University of California Press in 1994.This academic background suggests that Keenan had been actively involved in the new cultural history movements that sprung up in the 1970s. 相似文献
78.
高原地区由于独特的地理环境和气候条件,从而引起各种高原疾病。尿酸增高在临床上比较常见,为了给诊断和治疗提供理论指导,本文对尿酸增高患者进行了原因分析,现分析报道如下。 相似文献
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Wei Fuming Huang Zheng Zhu Yanian Zhou Jun Yu Heying Xu Ting Liu Feng Yao Yong 《上海大学学报(英文版)》1998,2(2):148-155
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Studies of synergetic irradiation effects and liquid lead-bismuth eutectic （LBE） corrosion/embrittlement effects on ferritic/martensitic （F/M） steels are of great importance for developing high power spallation neutron targets （〉1 MW） such as the European Spallation Source （ESS） and Accelerator Driven System （ADS） facilities that can be used for transmuting long-lifetime radioactive wastes. Liquid LBE （45Pb-55Bi, in terms of mass fraction） has been selected as the candidate target material in high power spallation neutron targets due to its favourable thermal, physical ＆ chemical properties, and to its high spallation neutron yield. 9Cr F/M steels such as T91 （9CrlMoVNb, in terms of mass fraction） have been chosen as the structural material for the targets due to their good mechanical properties and good resistance to irradiation induced swelling in fission neutron irradiation environments. For developing high power spallation neutron targets, behaviors of F/M steels in spallation neutron target irradiation environments and LBE corrosion/embrittlement effects have been extensively studied. However, many open questions have not been answered. The aim of this paper is to describe the present research situation on this topic. The obtained experimental data about LBE embrittlement effects on F/M steels is summarized and the influence of different parameters involved is analyzed to understand the influence effect on LBE embrittlement effect of F/M s. 相似文献