显示条目: 32066-32085 / 166236

    • U-Boot在 S3c2410上的移植 

      姚铭; 周结华; 王淑贞 (《微计算机应用》编辑部, 2008-04)
      摘要:基于Samsung公司的板子S3c2410,实现U-Boot的移植 ,并成功启动内核和加载文件系统。首先了解移植环境 ,本文主要是针对最小硬件系统的移植;分析 U - Boot的启动原理和启动流程,深刻剖析U-Boot阶段1和阶段2的运行过程;在通用的U-Boot基础上修改其硬件配置,对应于S3c2410板子上的硬件;编译U-Boot,用JTAG口将U-Boot烧写到板子;最后利用U-Boot命令下载 ,烧写内核和文件系统 ...
    • U-Boot在S3c2410上的移植 

      王淑贞; 姚铭; 周结华 (2008-04-15)
      基于Samsung公司的板子S3c2410,实现U-Boot的移植,并成功启动内核和加载文件系统。首先了解移植环境,本文主要是针对最小硬件系统的移植;分析U-Boot的启动原理和启动流程,深刻剖析U-Boot阶段1和阶段2的运行过程;在通用的U-Boot基础上修改其硬件配置,对应于S3c2410板子上的硬件;编译U-Boot,用JTAG口将U-Boot烧写到板子;最后利用U-Boot命令下载,烧写内核和文件系统,复位后成功启动内核,这一 ...
    • UASB和微生物固定化反应器降解含聚废水组合工艺 

      刘江红; 潘洋; 谷璟瑶; 贾云鹏; 芦艳 (2013-07-05)
      随着聚合物驱油技术在油田的广泛推广,部分水解聚丙烯酰胺(HPAM)在为油田提高采收率的同时,对当地环境也产生了相当大的危害。本文在对含聚污水水质分析和可生化性分析的基础上对污水进行可生化性调整,运用“气浮-uASb-水解酸化-微生物固定化反应器“组合工艺对含聚污水进行了生化处理模拟实验。模拟实验分为静态模拟和动态模拟两部分。静态模拟实验中,降解6天后,聚丙烯酰胺降解率达到89.7%。动态模拟试验中,组合工艺处理2天以后,HPAM降解率为 ...
    • UASB生物制氢反应系统生物强化作用研究 

      龙敏南; 史继祥; 徐惠娟; 邬小兵; 胡忠; 徐方成 (2008-09-15)
      采用上流式厌氧污泥床(UASB)反应器,以糖蜜废水为底物,利用厌氧活性污泥发酵产氢.向反应器中投加高产氢微生物产酸克雷伯氏菌HP1,探讨了生物强化作用对反应器产氢能力的影响.研究表明:在污泥接种量为30.0 gVSS/L、启动负荷为6.0 kgCOD/(m3.d)、水力停留时间(HRT)为9 h、投菌量为3%的条件下对生物制氢系统进行强化,可使反应系统产氢能力提高25%,并形成丁酸型发酵产氢,液相末端发酵产物中丁酸和乙酸的含量占挥发酸总 ...
    • UAV formation flight control and formation switch strategy 

      Luo, Delin; Xu, Wenlong; Wu, Shunxiang; Ma, Youping; 罗德林; 吴顺祥 (IEEE Computer Society, 2013)
      During the formation flight time, the Unmanned Aerial vehicles (UAVs) have to transform their flight formation in many cases, such as environmental change , the modification of the task and some UAV s leaving of the ...
    • UBI-QEP study of catalytic reduction desulfuration on cobalt oxide 

      Sun, J; 孙杰; Lin, JD; 林敬东; Yi, J; 易军; Wei, G; 魏光; Chen, HB; 陈鸿博; Liao, DW; 廖代伟 (PEKING UNIV PRESS, 2002)
      The catalytic reduction desulfuration on cobalt oxide was investigated using UBI-QEP method. It was found that the reaction followed the Redox mechanism in the reduction process of SO2 with CO at low temperature. First, ...
    • UBI-QEP study on purification of vehicle exhaust gas 

      Sun, J; 孙杰; Lin, JD; 林敬东; Lin, YZ; 林银钟; Yi, J; 易军; Chen, HB; 陈鸿博; Liao, DW; 廖代伟 (SCIENCE CHINA PRESS, 2002)
      The Vehicle exhaust gas generally contains nitrogen oxides and the fossil fuel which do greatly harm to air environment. Although the use of catalytic converters for the vehicle gas has resulted in considerable progress ...
    • UBI-QEP法研究氧化钴上的催化还原脱硫反应 

      孙杰; 林敬东; 易军; 魏光; 陈鸿博; 廖代伟 (2002-05-30)
      应用UBI-QEP能学方法,研究了氧化钴表面上的催化还原脱硫反应.发现在CO还原SO2的过程中,低温条件下,反应遵循氧化还原(Redox)机理,即CO先与晶格氧反应在表面产生氧缺位,然后SO2在氧阴离子空穴上被还原;在高温条件下,COS中间态确实存在,反应为Redox机理和COS中间态机理共同作用.中间产物SO是极不稳定的,即能很快被CO继续还原,又可以为表面氧物种所氧化.COS可抑制表面氧物种,因此能起到间接控制该反应的作用.
    • Ubiquitin B: an essential mediator of trichostatin A-induced tumor-selective killing in human cancer cells 

      方亚 (2010)
      Although histone deacetylase inhibitors (HDACis) are emerging as a new class of anticancer agents, the mechanism of tumor-selective killing by HDACi is not well understood. We used suppression of mortality by antisense ...
    • Ubiquitin E3 Ligase CRL4(CDT2/DCAF2) as a Potential Chemotherapeutic Target for Ovarian Surface Epithelial Cancer 

      Pan, Wei-Wei; Zhou, Jian-Jie; Yu, Chao; Xu, Ying; Guo, Lian-Jun; Zhang, Hai-Yi; Zhou, Dawang; Song, Fang-Zhou; Fan, Heng-Yu; 周大旺 (AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC, 2013-Oct 1)
      Cullin-RING ubiquitin ligases (CRLs) are the largest family of E3 ligases and require cullin neddylation for their activation. The NEDD8-activating enzyme inhibitor MLN4924 reportedly blocked cullin neddylation and inactivated ...
    • Ubiquitin E3 ligase CRL4CDT2/DCAF2 as a potential chemotherapeutic target for ovarian surface epithelial cancer 

      Pan, Wei-Wei; Zhou, Jian-Jie; Yu, Chao; Xu, Ying; Guo, Lian-Jun; Zhang, Hai-Yi; Zhou, Dawang; Song, Fang-Zhou; Fan, Heng-Yu; 周大旺 (American Society for Biochemistry and Molecular Biology Inc., 2013-10-11)
      Cullin-RING ubiquitin ligases (CRLs) are the largest family of E3 ligases and require cullin neddylation for their activation. The NEDD8-activating enzyme inhibitor MLN4924 reportedly blocked cullin neddylation and inactivated ...
    • Ubiquitinated or sumoylated retinoic acid receptor alpha determines its characteristic and interacting model with retinoid X receptor alpha in gastric and breast cancer cells 

      Wu, Q; 吴乔; Lin, XF; Ye, XF; Zhang, B; Xie, Z; Su, WJ; 苏文金 (SOC ENDOCRINOLOGY, 2004)
      Retinoic acid receptor alpha (RARalpha) plays an important role in mediating all-trans retinoic acid (ATRA) signals. In this study, we found that ATRA up-regulated RARalpha mRNA and protein expression in gastric cancer ...
    • Ubiquitination in Rho Signaling 

      Ding, Feng; 丁凤; Wang, Hong-Rui; Yin, Zhenyu (BENTHAM SCIENCE PUBL LTD, 2011-10-11)
      The Rho family small GTPases of the Ras superfamily play key roles in regulating diverse signaling pathways that control a myriad of fundamental cellular processes such as cytoskeletal dynamics, cell cycle progression, ...
    • Ubiquitous cyanobacterial podoviruses in the global oceans unveiled through viral DNA polymerase gene sequences 

      Huang, Sijun(Univ Maryland, Inst Marine & Environm Technol, Ctr Environm Sci, Baltimore, MD 21202 USA); Wilhelm, Steven W.( Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA); Jiao, Nianzhi; 焦念志; Chen, Feng(Univ Maryland, Inst Marine & Environm Technol, Ctr Environm Sci, Baltimore, MD 21202 USA) (NATURE PUBLISHING GROUP, 2010-10)
      As a major cyanophage group, cyanobacterial podoviruses are important in regulating the biomass and population structure of picocyanobacteria in the ocean. However, little is known about their biogeography in the open ...
    • UBoost: Boosting with the universum 

      Shen, Chunhua; Wang, Peng; Shen, Fumin; Wang, Hanz; 王菡子 (IEEE Computer Society, 2012)
      It has been shown that the Universum data, which do not belong to either class of the classification problem of interest, may contain useful prior domain knowledge for training a classifier [1], [2]. In this work, we design ...
    • uBoost: Boosting with the Universum 

      Shen, Chunhua; Wang, Peng; Shen, Fumin; Wang, Hanzi; 王菡子 (IEEE COMPUTER SOC, 2012-04)
      It has been shown that the Universum data, which do not belong to either class of the classification problem of interest, may contain useful prior domain knowledge for training a classifier [1], [2]. In this work, we design ...
    • Ubuntu特色的地区主义:塑造更好的南部非洲发展共同体? 

      KEORAPETSE MMOLOKI GABATLHAOLW (2015-12-28)
      本文的研究领域是以南部非洲地区为例的非洲区域一体化。尽管区域机构在 非洲政治中的重要性越来越突出,它们的特征和表现却都没有达到人们的预期。 本文共分六个章节,关注、并分析和讨论南部非洲发展共同体(南共体)集团的 组织机构、措施、行为特点与现实状况。本文的主题是一体化中不可分割的经济、 政治和社会压力。使用新区域主义理论(NRA)和Ubuntu的概念,本文探讨在南 部非洲发展共同体区域化进程中所遇到的问题、挑战与机遇。关于南共体内设立 ...
    • UHV-CVD系统自组装生长Si基Ge量子点 

      王钰 (2007-06-22)
      本论文利用超高真空化学气相沉积(UHV-CVD)设备,系统地研究了外延生长条件对Si基Ge量子点特性的影响。以自组装S-K(Stranski-Krastanov)先层后岛生长模式的热力学及动力学理论为基础,详细分析了生长条件对量子点形貌、密度、尺寸分布等的影响,得到了实验结果的支持。 在GeH4流量和温度不变的情况下,随着外延时间增长,岛的尺寸增大。当岛的尺度增加到一定值时,大岛尺寸不会明显变化,而小岛尺寸和密度一直在增加。热力学平衡理 ...
    • UHV/CVD法生长硅基低位错密度厚锗外延层 

      周志文; 蔡志猛; 张永; 蔡坤煌; 周笔; 林桂江; 汪建元; 李成; 赖虹凯; 陈松岩; 余金中; 王启明 (2008-02-15)
      采用超高真空化学气相淀积系统,以高纯Si2H6和GeH4作为生长气源,用低温缓冲层技术在Si(001)衬底上成功生长出厚的纯Ge外延层.对Si衬底上外延的纯Ge层用反射式高能电子衍射仪、原子力显微镜、X射线双晶衍射曲线和Ra-man谱进行了表征.结果表明在Si基上生长的约550nm厚的Ge外延层,表面粗糙度小于1nm,XRD双晶衍射曲线和Ra-man谱Ge-Ge模半高宽分别为530″和5.5cm-1,具有良好的结晶质量.位错腐蚀结果显示 ...