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Search Results: 1 - 10 of 137734 matches for " Hong-Chao Zhang "
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Research progress on seaweed bed ecosystem and its engineering.

ZHANG Shou-yu,SUN Hong-chao,

应用生态学报 , 2007,
Abstract: Seaweed bed ecosystem is one of the typical nearshore ecosystems. Because of its unique structure and function, the ecology and engineering of this ecosystem have received much attention around the world in recent years. In this paper, the concept, structure, and function of seaweed bed ecosystem, as well as the definition and implementing steps of seaweed bed ecosystem engineering were introduced, and the most recent development in the research of seaweed bed ecosystem in developed countries was reviewed, with the research projects in the United States and Japan as examples. More basic research in seaweed bed ecosystems in China was urgent to be conducted to promote the marine economy and the development of relevant sciences and technologies.
Off-pump coronary artery bypass grafting using a bilateral internal mammary artery Y graft
Cheng-Xiong Gu,Jun-Feng Yang,Hong-Chao Zhang,Hua Wei
老年心脏病学杂志(英文版) , 2012,
Abstract: ObjectiveTo evaluate the outcome of off-pump coronary artery bypass grafting (OPCABG) using a bilateral internal mammary artery (BIMA) Y configuration graft to achieve total arterial myocardial revascularization. Methods From October 2002 to December 2008, 208 patients (196 males and 12 females) underwent OPCABG using a BIMA Y configuration graft. The average age of the patients was 56.5 ± 11.3 years, with an age range of 33–78 years. A total of 167 (80.2%) cases had triple-vessel disease. Left main stem disease was found in 33 (15.9%) cases, and double-vessel disease was found in 8 (3.9%) cases. The semi-skeletonization technique was used to harvest the two internal mammary arteries (IMAs), and then the free right internal mammary artery was connected end-to-side to the left internal mammary artery (LIMA) in situ to complete the Y configuration graft. Off-pump and sequential anastomosis methods were used to perform coronary artery bypass surgery in all patients. Graft patency was assessed intra-operatively with the HT311 transit time flowmeter. Results A total of 728 distal anastomoses were performed in 208 patients, with the average being 3.5 ± 1.3 per person. No one died or experienced recurrent angina within 30 days after the operation. Conclusions OPCABG using the BIMA Y graft was safe and effective to achieve total arterial revascularization. This method avoids surgical operation on the ascending aorta and other incisions.
Experimental diagnosis of electron density of laser induced air plasma by interferometry

Zhang Hong-Chao,Lu Jian,Ni Xiao-Wu,

物理学报 , 2009,
Abstract: High quality interference pattern was obtained with a modified Mach-Zehnder interferomenter. An FFT analysis is applied to extracting the phase of the reconstructed interferograms, and then the inverse Abel transformation is used to calculate the three-dimensional electron density distribution. The electron density and the plasma expanding velocity at various delay times were obtained. The results show that the formation of the plasma channel in the early stage of the laser induces air plasma, and the rapid decrease of the plasma expanding velocity accelerates the collapse of the plasma channel. At about 48 nanosecond time, the eccentricity of the plasma shape reaches the maximum value and then evolves to a circular shape.
Some Technical Issues of Airborne LIDAR System Applied to Wenchuan Earthquake Relief works

MA Hong-chao,YAO Chun-jing,ZHANG Sheng-de,

遥感学报 , 2008,
Abstract: 就机载激光雷达在"5·12"四川地震灾区快速获取数据的若干关键问题进行了探讨.介绍了机载激光雷达的一般技术以及数据处理基本流程,对影响数据获取和最后成果精度的几个普遍问题进行了讨论,根据这次四川灾区的实际情况,比较详细介绍了数据获取和处理的一些关键技术问题.这些问题的探讨,对于机载激光雷达在中国广大西南地区的推广应用以及激光雷达在应急响应中的应用,有较好的参考价值.
Mechanism based on HCBF for large flow inspect

CHEN Shu-qiao,ZHANG Guo,HU Hong-chao,

计算机应用研究 , 2010,
Abstract: For the limited counter overflow probability in counting Bloom filter, this paper proposed a novel mechanism based on hierarchy counting Bloom filter(HCBF) for large flow inspect. By extending the standard structure of counting Bloom filter(CBF) to multi-layer with the overflow probability void feature, the mechanism could not only adjust the paramer configed, but also controled the false probability of large flow inspect. Experiments are conducted based on the data either randomly produced by computer or sampled from the real network trace. Results demonstrate that the proposed mechanism can achieve finer space saving and better accuracy with same overflow probability.
Off-pump coronary artery bypass grafting using a bilateral internal mammary artery Y graft

Cheng-Xiong Gu,Jun-Feng Yang,Hong-Chao Zhang,Hua Wei,Ling-Ke Li,

老年心脏病学杂志(英文版) , 2012,
Theoretical investigation of the thermoelectric transport properties of BaSi2

Peng Hu,Wang Chun-Lei,Li Ji-Chao,Zhang Rui-Zhi,Wang Hong-Chao,Sun Yi,

中国物理 B , 2011,
Abstract: The full-potential linear augmented plane wave method based on density functional theory is employed to investigate the electronic structure of BaSi2. With the constant relaxation time and rigid band approximation, the electrical conductivity, Seebeck coefficient and figure of merit are calculated by using Boltzmann transport theory, further evaluated as a function of carrier concentration. We find that the Seebeck coefficient is more anisotropic than electrical conductivity. The figure of merit of BaSi2 is predicted to be quite high at room temperature, implying that optimal doping may be an effective way to improve thermoelectric properties.
Tolerance and accumulation of heavy metals by Exophiala pisciphila strain isolated from plant roots growing in metal polluted soils

ZHANG Yu-jie,LI Hong-chao,ZHAO Zhi-wei,

土壤 , 2012,
Abstract: A DSE stain was isolated from plant roots of Arundinella bengalensis (Spreng.) Druce, naturally growing on the plot of lead-zinc mine areas in Huize, Yunnan Province. The isolate was identified as an Exophiala pisciphila strain by morphological characteristics and ITS1-5.8S rDNA-ITS 2 sequence analysis. The tolerance to heavy metals and accumulation abilities of the E. pisciphila strain were investigated. MICs (minimum inhibitory concentration) to Pb2+, Zn2+ and Cd2+ of the fungus were 2.3, 0.51, and 3.1 mg/ml, respectively. The E. pisciphila strain was able to accumulate lead, zinc and cadmium over 20%, 15% and 5% of its biomass (by dry weight), respectively. It was demonstrated that the fungi was supper accumulative and multi-tolerant to these metals. Fungi colonization in the roots may play important roles in reducing toxicity to the plant root cells of heavy metals in soils.
Large Aperture Scintillometers(LAS)Observation in Semi-arid Regions of Northwestern China

HUANG Shan,ZHANG Wen-yu,ZUO Hong-chao,LIU Xin,SHI Yong-yi,

中国沙漠 , 2011,
Abstract: In this paper,sensible heat flux in semi-arid region of northwestern China were calculated and analyzed by use of the observation data of Large Aperture Scintillometers(LAS) recorded per 30 minutes,the temperature,pressure data,and the observation data by Eddy Covariance System at Lanzhou University Semi-arid Climate and Environment Observatory during summer and winter of 2007.The values of the sensible heat flux in summer were bigger than that in winter,and there was a lag of peak value on diurnal variatio...
Mechanism of laser-induced plasma shock wave evolution in air

Zhao Rui,Liang Zhong-Cheng,Han Bing,Zhang Hong-Chao,Xu Rong-Qing,Lu Jian,Ni Xiao-Wu,

中国物理 B , 2009,
Abstract: A theoretical model is proposed to describe the mechanism of laser-induced plasma shock wave evolution in air. To verify the validity of the theoretical model, an optical beam deflection technique is employed to track the plasma shock wave evolution process. The theoretical model and the experimental signals are found to be in good agreement with each other. It is shown that the laser-induced plasma shock wave undergoes formation, increase and decay processes; the increase and the decay processes of the laser-induced plasma shock wave result from the overlapping of the compression wave and the rarefaction wave, respectively. In addition, the laser-induced plasma shock wave speed and pressure distributions, both a function of distance, are presented.
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