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Search Results: 1 - 10 of 390352 matches for " <br>杨生兵 "
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半埋式海底管道周围海床瞬态液化稳定性研究
Numerical Study on Wave-induced Oscillatory Soil Liquefaction around a Partially Buried Pipeline

段伦良, 郑东, 张启博,, <br>DUAN Lunliang, ZHENG Dongsheng, ZHANG Qibo, ZHU Bing, YANG Bing
- , 2017, DOI: 10.3969/j.issn.0258-2724.2017.04.004
Abstract: 为研究波浪荷载作用下半埋式海底管道周围海床的瞬态液化稳定性,通过动量源函数法进行数值造波,以LSM法追踪波浪自由液面,利用有限元法求解海床控制方程,建立了波浪-海床-半埋式海底管道相互作用的二维数值模型.将求解的波浪模块中的海床表面压力作为海床模块的边界条件,得到海床中的超孔隙水压力及有效应力,研究了回填高度及波浪特性对半埋式海底管道周围海床稳定性的影响.研究结果表明:波浪特性对半埋式海底管道周围海床瞬态液化稳定性影响较大,管道底部海床瞬态液化深度幅值随波高及波浪周期增大而增大;当波高为3 m、波浪周期为10 s时,管线底部海床液化深度可达0.92 m;当回填高度大于临界回填高度时,管道底部海床不会发生瞬态液化现象.
: To examine the oscillatory soil response around a partially buried pipeline under wave load, a numerical model for wave-seabed-pipeline interactions was proposed using the finite element method, in which the momentum source function was added to the Reynolds-averaged Navier-Stokes (RANS) equation to generate waves, and the Level Set Method was used to track the water free surface. The wave pressure calculated from the wave model was applied to be the seabed model boundary condition to determine the wave-induced soil response. Based on the proposed model, a set of analyses regarding the effects of backfill thickness and wave characteristics on the oscillatory soil response was carried out. Numerical results indicate that wave characteristics can significantly affect the wave-induced oscillatory soil response, and that the liquefaction depth increases with the increment of wave height and period. The liquefaction depth at the bottom of the pipeline can reach 0.92 m when the wave height is 3 m and the wave period is 10 s. Moreover, the soil at the bottom of the pipeline can be prevented from being liquefied when the backfill thickness is greater than the critical backfill thickness under a certain soil condition. In other words, the soil at the bottom of the pipeline can be protected by increasing the backfill thickness
小麦品种性状演变规律的分析
李明,
麦类作物学报 , 1999, DOI: 10.7606/j.issn.1009-1041.1999.06.119
Abstract: 对1955~1997年75个试验组别、786个参试品次进行分析,结果表明,各性状间呈非一致性变化;同时有的年份气候条件对性状表值的影响程度超过了遗传因素。提出现阶段高产、超高产育种中各性状的理想构成模式应为:株高在偏高年型85~90cm,偏低年型75~80cm;穗数525~600万/hm2;千粒重分别为40~45g和38~40g;穗长9~11cm;分化小穗数20~22个;结实小穗数18~20个;穗粒数35~45粒。
Fabrication and Tribological Study of 1-Octadecene Self-assembled Monolayer on Diamond-like Carbon Film
类金刚石薄膜表面有机单分子薄膜的制备及其摩擦性能研究

SONG Shi-yong,WANG Cheng-bing,ZHANG Jun-yan,YANG Sheng-rong,<br>宋仕永,王成,张俊彦,
摩擦学学报 , 2007,
Abstract: 采用加热法在类金刚石薄膜表面制备1-十八烯自组装有机单分子薄膜,采用接触角测量仪及傅立叶变换红外光谱仪表征薄膜的结构,在原子力显微镜及UMT-2MT型摩擦磨损试验机上从微观和宏观2个角度考察了薄膜的摩擦性能.结果表明,经过十八烯修饰后,DLC薄膜表面疏水性能提高,摩擦系数明显降低,有利于DLC薄膜在微机电系统中的应用.
级配特性对砂土渗透系数影响试验研究
Experimental Study on Influence of Particle-Size Distribution on Permeability Coefficient of Sand

, 刘一飞, 万奋涛, , 冯君, 赵兴权, 郑东<br>YANG Bing, LIU Yifei, WAN Fentao, YANG Tao, FENG Jun, ZHAO Xingquan, ZHENG Dongsheng
- , 2016, DOI: 10.3969/j.issn.0258-2724.2016.05.006
Abstract: 为深入分析级配特性对砂土渗透性的影响规律,采用常水头试验方法,研究了砂土不均匀系数、曲率系数、平均粒径和孔隙比对渗透系数的影响。采用正交试验方法对各影响因素进行了显著性分析,通过控制变量法进一步研究了各因素与渗透系数的关系。研究结果表明:渗透系数随曲率系数增大而增大,随不均匀系数的增大而减小,当不均匀系数增大到一定值(如本文中不均匀系数为11)时,渗透系数趋于稳定;渗透系数与平均粒径的变化关系接近线性正相关,在平均粒径不断增大的情况下,其渗透系数的变化幅度可达2个数量级。
: In order to investigate the influence of particle-size distribution on permeability of sand, the influence of uniformity coefficient, gradation coefficient, mean diameter, and void ratio on permeability coefficient was studied by constant head test. The significance of the influencing factors was then analyzed using orthogonal experimental design, and the relationships between the factors and the permeability coefficient were discussed by control variable method. The experimental results show that the permeability coefficient increases with the increase of gradation coefficient, and decreases with the uniformity coefficient. When the uniformity coefficient increases up to a certain value, the permeability coefficient tends to be stable (e.g.Cu=11 in this study). There is a nearly linear, positive correlation between permeability coefficient and mean diameter. With the increase of the mean diameter, the increasing amplitude of permeability coefficient can be up to two orders of magnitude
Construction and preparation of helper-dependent adenoviral vector expressing human respiratory syncytial virus F gene
可表达人呼吸道合胞病毒融合蛋白辅助病毒依赖型腺病毒载体的构建与制备

YANG Bing,HE Jin-sheng,SHI Chang-xin,ZHANG Mei,YU Jie-mei,<br>,何金,石长信,张梅,虞结梅
微生物学报 , 2007,
Abstract: To construct a helper-dependent adenoviral vector expressing human respiratory syncytial virus (RSV) subgroup A F gene, and finish large scale preparation, purification and identification of the vector. F gene under the control of CMV promoter was subcloned into a shutle vector pSC11, and then cloned into HADd plasmid pSC15B. The HDAd/F genome was liberated by removing the bacterial sequences from the resulting plasmid pSC15B/F digested with restriction enzyme Pme I, and then the linear HDAd/F DNA was transfected into 293Cre4 cells with calcium phosphate transfection method. The cells were infected by helper virus 16 hours after transfection. HDAd/F was amplified by serial coinfection of 293Cre4 cells by helper virus and the crude lysates from previous passage until it reached plateau of amplification by BFU staining of parallel amplified control vector pSC9A. HDAd/F was purified by CsCl gradient ultracentrifugation and expression of F protein was identified by RT-PCR and Western blot. HDAd/F was constructed, purified successfully. The expression of F protein was detected. The successful construction and preparation of HDAd/F is the foundation for the further investigation of potential immune protection in vivo and opens a new window for the RSV vaccine research.
Optical emission diagnosis of helicon-wave-plasma-enhanced chemical vapor deposition of nanocrystalline silicon
螺旋波等离子体化学气相沉积纳米硅薄膜的光学发射谱研究

Yu Wei,Wang Bao-Zhu,Yang Yan-Bin,Lu Wan-Bing,Fu Guang-Sheng,<br>于 威,王保柱,彦斌,路万,傅广
物理学报 , 2005,
Abstract: 利用光学发射谱技术对螺旋波等离子体化学气相沉积纳米硅薄膜的等离子体内活性粒子的光发射特征进行了原位测量.研究了薄膜沉积过程中各实验参量对活性基团SiH*, Hβ以及Hα的发射谱强度的影响.实验结果表明,静态磁场的加入可显著提高反应气体 的解离效率 ;适当的氢稀释可以提高氢活性粒子的浓度,而过高的氢稀释比将使含硅活性基团浓度显著 减小;提高射频馈入功率整体上可以使各活性粒子的浓度增加,并有利于提高到达衬底表面 氢活性粒子的相对比例.结合螺旋波等离子体色散关系和等离子体特点对以上结果进行了分 析.该结果为螺旋波等离子体沉积纳米硅薄膜过程的理解及制备工艺参数的调整提供了基础 数据.
Randomness analysis of external cavity semiconductor laser as entropy source
外腔半导体激光器随机数熵源的腔长分析

Zhang Ji-Bing,Zhang Jian-Zhong,Yang Yi-Biao,Liang Jun-Sheng,Wang Yun-Cai,<br>张继,张建忠,毅彪,梁君,王云才
物理学报 , 2010,
Abstract: In this paper, we employ chaotic light as an entropy source, generated by semiconductor lasers with optical feedback induced by external cavity, to generate 500 Mbit/s random number sequence and then study specifically the influence of external cavity length on randomness. The results indicate that the generated random sequence has an weak periodicity caused by the external cavity feedback under a single-channel chaotic source, and can only pass two or three tests of the National Institure of Standards and Technology(NIST) when the external-cavity round trip delay time is an integral multiple of the sampling time. On the other hand, the weak periodicity can be eliminated by using two different chaotic sources when their external cavity lengths are unproportional to each other, and the obtained random sequence can pass all tests of the NIST after XOR processing.
Genetic polymorphisms of ten X chromosome STR loci in Hunan Tujia population and their forensic evaluation
湖南土家族群体X染色体10个STR位点的遗传多态性及法医学应用价值评估

HAN Wei,YANG Li,GUI Hong-Sheng,YU Bing,WEI Jie,LI Sheng-Bin,<br>韩卫,,桂宏胜,,卫洁,
遗传 , 2008,
Abstract: Genomic DNA was extracted from whole blood of 198 unrelated health individuals of Tujia ethnic group from south China's Hunan Province. Genotyping and detection of PCR products were carried out on denaturing polycrylamide gel electrophoresis followed by silver staining. Allele frequencies and genotype frequencies were computed. Deviation from Hardy-Weinberg equilibrium and differences of gene distribution were examined by SPSS 13.0. Fixation index, genetic polymorphism and indices of forensic application were calculated using Fstat and Powerstats, respectively. The results revealed that the frequencies of 65 alleles were distributed from 0.0048 to 0.6170. Among the ten X-STR loci, DXS6789, DXS6799 and HPRTB presented lower diversity and differentiation, while DXS7133 and DXS7423 showed lower value in forensic application. Results of multiple comparisons by loci showed that difference between German, Italian and Tujia population were the most dominant, and it suggested that great genetic differences did exist between Caucasian and Mongo-lian. In conclusion, DXS6804, DXS7132, DXS7130, DXS8378, DXS6789, DXS6799, DXS7424 and HPRTB had a good value in forensic identification, paternity testing of female and disease related study for Tujia population.
NEOTECTONICS ALONG THE NORTH COAST OF SOUTH CHINA SEA AND ITS REGIONAL CORRELATION AROUND THE BOUNDARY OF THE EARLY AND MIDDLE PLEISTOCENE
南海北缘早-中更新世之交新构造活动 及其区域对比*

Zhu Zhaoyu,Xie Jiubing,Zheng Wangqiong,Mo Sheng,Yang Chao,Rao Zhiguo,Zhou Houyun,Wang Junda,<br>朱照宇,谢久,郑王琼,,,饶志国,周厚云,王俊达
第四纪研究 , 2006,
Abstract: Based on the age dating, geochemical and geophysical analyses, as well as field investigation along the coast of South China Sea, the authors expatiated the characteristics of sedimentary facies, chemical components and susceptibility of the Zhanjiang Formation (Early Pleistocene) and the Beihai Formation (Middle Pleistocene), and showed the pictures of deformation, folds, faults, and volcanism in the area. It is indicated that there have occurred a series of tectonic events in the northern parts of the South China Sea during the period from 0.9MaB.P. to 0.7MaB.P., a mainly uplifting period with sedimentary source changed from continental-oceanic to continental, with an increasing of continental weathering and erosion, with a dropping of sea level, with volcanic explosion, and with the formation of fold, fault and unconformity. These events indicated a tectonic activity, which is similar to the records of other areas, such as the Loess Plateau, Tibetan Plateau, West China, North China, and East China. It is also suggested that the uplifting of the Tibetan Plateau by stages not only caused great changes to its own tectonics, landform, and climate, but also effected and forced the process of environmental changes in its adjacent regions as well as Chinese continent, even the whole of East Asia. We believe that this tectonic movement wa s controlled by the Coupled Climato-Tectonic System and followed the rule of the Climato-Tectonic Cycle. The forcing effects of the environmental change of Chinese continent are the exogenic-endogenic geodynamic process——the global tectonic system, the global climatic system and so on.
Molecular Cloning and Characterization of mBolA1, a Novel Mouse Secreted Protein
小鼠新分泌蛋白基因mBolA1的克隆与鉴定

CAO Jia-bing,ZHOU Yu-bo,QI Jia,YANG Hong-meng,WANG Ke-sheng,HAN Ze-guang,<br>曹家,周宇波,祁佳,鸿蒙,王克,韩泽广
中国生物工程杂志 , 2006,
Abstract: 采用生物信息学工具预测与实验相结合的方法得到了一个新的小鼠分泌蛋白基因mBolA1。该基因定位于染色体3F2,cDNA全长为730bp,编码137个氨基酸的蛋白,该蛋白含有一个保守的BolA结构域,等电点为9.05。用RT-PCR方法从鼠的混合cDNA库中克隆到mBolA1。Western blot实验表明mBolA1能从瞬转的COS-7细胞中分泌到细胞培养液中。亚细胞定位显示mBolA1定位于细胞浆,且与高尔基体不共定位,提示它是个非经典分泌途径的分泌蛋白。RT—PCR显示mBolA1在组织中广泛表达。它的具体功能有待进一步研究。
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