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Search Results: 1 - 10 of 404798 matches for " <br>吕文志 "
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ANALYTICAL METHOD FOR PILE COMPOSITE GROUND UNDER FLEXIBLE FOUNDATION
柔性基础下桩体复合地基的解析法

LU Wenzhi,YU Jianlin,GONG Xiaonan,<br>,俞建霖,龚晓南
岩石力学与工程学报 , 2010,
Abstract: 柔性基础、垫层、复合地基、下卧层土体的共同作用一直没有得到较好的考虑。将四者作为一个共同作用的系统,假设桩土界面之间存在相对滑移且同一水平面上地基土沉降不同,考虑系统四部分界面上的应力与变形协调,对典型单元体建立荷载传递基本微分方程并给出其解答,从而得到表征复合地基性状的沉降和桩土应力比等的求解公式;与某工程实测成果及按现行规范推荐方法计算所得结果对比表明该解答是合理的,柔性基础下桩体复合地基中的桩土荷载分担比、荷载传递机制等均与刚性基础下的复合地基不同,工程设计中要高度重视和运用等沉面和中性面的概念;最后对进一步的解析法研究提出了建议。
A Application of Mumford-Shah Model in Segmentation of Satellite Cloud Image
Mumford-Shah模型在卫星云图分割中的应用

FEI Wenlong,LU Hong,WEI Zhihui,<br>费,,
中国图象图形学报 , 2009,
Abstract: 利用Mumford-Shah模型对卫星云图进行分割和识别。根据卫星云图自身的特征,提出了基于核心灰度的Mumford-Shah模型,并用此模型分割出了单通道卫星云图中的高云、中云和低云。同时提出了一种基于核心灰度的Mumford-Shah模型的向量图像分割方法,对两个通道的卫星云图进行分割,更加准确地识别出中低云系在红外通道和可见光通道中的位置。
Local Search Algorithm for Solving Protein Structure Prediction Problem
求解蛋白质结构预测问题的局部搜索算法

LU Zhi-Peng,HUANG Wen-Qi,<br>,
计算机科学 , 2005,
Abstract: Protein structure prediction has proven to be one of the central problems in the field of computational biology. It is a feasible approach to predict theoretically the three-dimensional structure of proteins based only on amino acid sequence information. Using a new neighborhood structure and partly randomized off-trap strategy, a novel local search algorithm for protein structure prediction is proposed. Computational results demonstrate that our algorithm not only is more efficient than conventional genetic and Monte Carlo algorithms, but also find new configurations of lowest energy states missed in orevious papers for the sequence of length N=50
Isolation of Heterotrophic Nitrifiers Which Can Tolerate High Concentration of Ammonia-nitrogen and the Optimization of Their Nitrogen Removal Efficiency in Wastewater
耐受高浓度氨氮异养硝化菌的筛选及其脱氮条件优化

SI Wen-gong,Lv Zhi-gang,XU Chao,<br>司,,许超
环境科学 , 2011,
Abstract: The removal capabilities and tolerance of high concentration of ammonia-nitrogen of heterotrophic nitrifiers were studied.Methods included multi-point sampling,domestication,gradient dilution of domestication liquid,color indicator as rapid nitrification detection and isolation from streaking plate were conducted to screen heterotrophic nitrifiers.The strains were identified according to the sequence analysis of 16S rDNA.After inoculating the strains into ammonia-nitrogen wastewater,changes of nitrogen compounds were measured in order to understand their denitrification characteristics.The denitrification efficiency was optimized by improving the C/N ratio,changing the compatibility of the strains and mixing the compatible strains with the domesticated bacterial suspension.Finally 8 high-efficiency heterotrohic nitrifiers were obtained,and named as N1-N8 respectively.Phylogenetic analysis showed that 8 strains belonged to Comamonas genus,Rhodococcusgenus,Pseudomonas genus,Arthrobacter genus and Paracoccus genus,respectively.When the initial concentration of ammonia nitrogen was 256.9 mg·L-1 and the C/N was 5.5 of the artificial wastewater,the removal rates of ammonia nitrogen by the strains were about 65%-80%,and the stain N4 was the best.When the C/N ratio of the wastewater increased to 8.0,the ammonia nitrogen removal rates of the strains correspondingly increased to about 80%-90%.As the strains compatibility,the denitrification rate of N4+N5+N6 was 88.2% in the artificial wastewater with initial ammonia nitrogen concentration was 261.1 mg·L-1 and initial C/N ratio was 5.5, which was higher than that of any single strain.The ammonia nitrogen removal rate could reach to 99.8% when N4+N5+N6 were combined with the domesticated bacterial suspension.In the artificial wastewater,when the initial ammonia nitrogen increased to 446.9 mg·L-1 and the C/N ratio decreased to 3.2,the ammonia nitrogen removal rate of the mixed strains which composed of N4+N5+N6 and domesticated bacterial suspension was 99.9%.There was almost no nitrite and nitrate nitrogen accumulated in eventually,and the total nitrogen removal rate was 66.5%.The nitrogen which was assimilated by the strains was only 33% of the lost ammonia nitrogen.It shows that the strains which could not be isolated in the domesticated bacterial suspension had significant synergies effects on ammonia nitrogen removal of the isolating strains.
An overview of the methods and techniques for seismic data noise attenuation
地震资料去噪方法技术综合评述

ZHANG Jun-hua,L,<br>张军华,,田连玉,,钟磊
地球物理学进展 , 2006,
Abstract: For both prestack seismic gathers and stacked seismic data,noise attenuation is a very important part of seismic data processing.With the advancement of exploration techniques,the accumulated and developed software for noise attenuation are becoming more and more.It is valuable in theory and instructional in practice to sort different methods of noise attenuation and state their fundamentals,physical meanings,applied conditions and development futures.In this paper,we firstly divide the noise in seismic data according to different characteristics,and then overview some popular methods of noise attenuation in practice,including frequency filtering,frequency-wavenumber filtering,frequency-space filtering,the Radon transform,beamforming,methods of noise attenuation on the basis of wavelet decomposition and reconstruction,and so on.In the end,we also talk about the development trend of techniques for noise attenuation.
An overview of the methods and techniques for seismic data noise attenuation
地震资料去噪方法、技术综合评述

ZHANG Jun-hua,L,<br>张军华,,田连玉,,钟磊
地球物理学进展 , 2005,
Abstract: For both prestack seismic gathers and stacked seismic data, noise attenuation is a very important part of seismic data processing. With the advancement of exploration techniques, the accumulated and developed software for noise attenuation are becoming more and more. It is valuable in theory and instructional in practice to sort different methods of noise attenuation and state their fundamentals, physical meanings, applied conditions and development futures. In this paper, we firstly divide the noise in seismic data according to different characteristics, and then overview some popular methods of noise attenuation in practice, including frequency filtering, frequency-wavenumber filtering, frequency-space filtering, the Radon transform, beamforming, methods of noise attenuation on the basis of wavelet decomposition and reconstruction, and so on. In the end, we also talk about the development trend of techniques for noise attenuation.
Voltage Controlled Oscillator
一种基于MEMS的射频低相位噪声压控振荡器的研制

Li Li,Zhao Zhengping,Zhang Zhiguo,Guo Wensheng,Yang Ruixia,<br>李丽,赵正平,,,,杨瑞霞
半导体学报 , 2006,
Abstract: A 2GHz LC VCO is fabricated using a micromachined variable capacitor for frequency tuning.The MEMS variable capacitors,whose controlling plates and capacitor plates are separated,are fabricated in a surface micromachining process.These devices have a quality factor of 38.462 at 2GHz.The MEMS VCO operating at 2.007GHz achieves a single side band phase-noise of -107.5dBc/Hz at a 100kHz offset from the carrier and an output power of -13.67dBm.On the basis of analysis of VCO mechanical-thermal noise produced from the micromachined variable capacitor,a method for lowering the phase noise by reducing the squeeze damping is proposed and an optimized number of damping holes is obtained.
Geochemistry of fluid inclusions in the Axi gold deposit, West Tianshan, Xinjiang
新疆西天山阿希金矿床流体包裹体地球化学特征

ZHANG ZuoHeng,<br>张作衡,毛景,良 左国朝,陈伟十,朱和平,王龙生,林素
岩石学报 , 2007,
Abstract: 本文在系统总结前人关于矿床地质特征和流体成矿作用研究成果的基础上,补充开展了热液成矿期石英-碳酸盐阶段石英、方解石和重晶石中流体包裹体的均一法和冷冻法测温,并对石英样品进行了气相色谱测量,对石英流体包裹体中的稀土和微量元素进行了测试。结果表明,矿床具有典型的浅成低温热液金矿的特点,成矿流体总体上盐度很低,多数都集中于0.53~1.57wt%NaCl。成矿流体的主要成分为H_2O、CO_2和CH_4。流体包裹体微量元素与容矿围岩具有继承性,流体中Cu、Ni、Co、Mo、Zn、Pb、V、Sb和Li等的含量较高,可能说明了Cu、Zn、Co、Ni、Bi和Ba等元素在水岩反应过程中更容易进入流体当中。石英流体包裹体中∑REE为13825×10~(-12)~149935×10~(-12),LREE/HREE为2.63~50.83,δEu为0.70~0.91,表现为Eu的弱亏损。成矿流体的REE配分型式与火山岩具有相同的Eu亏损和右倾配分曲线,表明成矿流体在演化过程中可能继承了早期火山岩的REE特征;但成矿流体的LREE/HREE值比火山岩大,前者的REE配分曲线比后者更加右陡倾斜,这可能与后期变质水和大气降水的混入引起的成矿流体物质组分发生有关。
Application of chemical leaching tests to evaluate the bioavailability of heavy metals in atmospheric particles
应用化学提取法评价大气颗粒物中重金属的生物有效性

Feng Xidan,Liu Yan,Dang Zhi,Huang Weilin,Lu Xuanwen,<br>冯茜丹,刘艳,,黄伟林,
环境工程学报 , 2008,
Abstract: 以广州市楼顶降尘为研究对象,在分析其粒度分布和重金属总量的基础上,采用单一化学提取法(DWLP、TCLP)和多级化学提取法(SEP)研究了大气颗粒物中4种重金属元素的生物有效性.结果表明:样品中96%以上颗粒小于100 μm,其中10 μm和2.5 μm以下颗粒分别占33%和11%.大气颗粒物中重金属含量很高,Cu、Pb、Zn和Cd的平均含量分别为362.43、1 033.81、830.32和5.80 mg/kg,是广东省环境土壤背景值的17~64倍.单一提取法中,TCLP的提取效率明显高于DWLP,表明pH值是影响大气颗粒物中重金属释放的主要因素.SEP法结果显示,Zn和Cd的生物可利用态比例远高于Cu和Pb.经DWLP和TCLP法提取后,颗粒物中重金属的总含量有不同程度的降低,生物可利用态所占比例明显增加.通过综合分析,发现SEP比其他两种方法更适用于评价大气颗粒物中重金属的生物有效性.
Analysis and Implementation of Enhanced Network Driver on VxWorks
VxWorks增强型网络驱动程序(END)的分析与实现

LV Jia-yan,YANG Zhi-yi,YU Zhi-wen,WANG Ling-min,<br>佳彦,杨志义,,王灵敏
计算机应用研究 , 2005,
Abstract: With more and more extensive application of VxWorks, a popular embedded operating system, in many areas, how to make VxWorks support various hardware platforms is an urgent problem we must solve. This paper first introduces basic knowledge related to device driver. Then, it describes how to add END to VxWorks. Finally, it analyzes the work flow of an END template provided by Wind River.
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