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Fossil pharyngeal teeth of grass carp group and their implications for evolution, temporal and spatial distribution pattern, and paleoenvironment 期刊论文  OAI收割
SCIENCE CHINA-EARTH SCIENCES, 2021, 页码: 16
作者:  Su, Rui-feng;  Chang, Mee-Mann;  Chen, Gengjiao
  |  收藏  |  浏览/下载：44/0  |  提交时间：2021/09/17
基于“在地性”与“协同性”的丘陵地区县域“双评价”模式探讨——以湖南辰溪县为例 期刊论文  OAI收割
经济地理, 2020, 卷号: 40, 期号: 9, 页码: 102
作者:  尹怡诚;  成升魁;  马润田;  沈清基;  王亚琴
  |  收藏  |  浏览/下载：20/0  |  提交时间：2021/03/16
近海环境中抗生素分析样品前处理技术的研究进展 期刊论文  OAI收割
色谱, 2020, 卷号: 38, 期号: 1, 页码: 95-103
作者:  吕敏;  陈令新
  |  收藏  |  浏览/下载：97/0  |  提交时间：2020/07/08
抗生素  近海  前处理技术  综述  antibiotics  coastal  pretreatment techniques  review  The widespread and massive usage of antibiotics for the prevention and treatment of diseases in human and animals have resulted in their continuous discharge into the environment, and finally, into the coastal environment through various pathways. Accumulation of antibiotics in aquatic organisms poses a great threat to ecological and human health, especially because it facilitates the generation and spread of bacterial resistance. Given the diverse range of antibiotics with various features, as well as their presence at low concentrations in the environment, it is imperative to develop pretreatment techniques for antibiotics in various matrices. In this paper, the pretreatment methods proposed in recent decades for antibiotics in coastal water, sediment, and biota are summarized, with emphasis on commonly used methods such as solid-phase extraction, solid-liquid extraction, matrix solid-phase dispersion, and QuEChERS. Additionally, the potential factors influencing the extraction performance and clean-up efficiency are analyzed. The advantages and disadvantages of the methods and their development are finally discussed.  
基于“在地性”与“协同性”的丘陵地区县域“双评价”模式探讨——以湖南辰溪县为例 期刊论文  OAI收割
经济地理, 2020, 卷号: 40, 期号: 9, 页码: 102
作者:  尹怡诚;  成升魁;  马润田;  沈清基;  王亚琴
  |  收藏  |  浏览/下载：12/0  |  提交时间：2021/03/16
Data normalization of single camera visual measurement network system (EI CONFERENCE) 会议论文  OAI收割
2012 International Conference on Information Technology and Management Innovation, ICITMI 2012, November 10, 2012 - November 11, 2012, Guangzhou, China
作者:  Zhang Y.-C.;  Zhou J.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
With the development of visual measurement system  Normalize the measured coordinates into the same world coordinate system  Apply in the three coordinate measuring machine(CMM) to have the simulation experiment  So the data normalization has the advantage of more high precision. (2013) Trans Tech Publications  the visual measurement system of single camera which applied in the imaging theory of optical feature points  then get the global data  the result indicates that the maximum absolute tolerance between the normalization coordinates via the center of point set and the ones measured by CMM directly is 0.058mm  Switzerland.  it has been widespread used in the modern production. Due to the limit of the environment in scene  and achieve the overall measurement  the visual measurement system of single camera could not measure the shield between the measured objects each other. Focus on this problem  But the one between the coordinate repeatedly measured at the position of one network control point is 0.066mm  present a kind of the the knowledge of measurement network based on the visual measurement of single camera  set up the measurement network system via the multi-control points. Measure the optical feature points in every network control point via the visual measurement system of single camera  
经济社会发展对海河流域水质影响的尺度效应研究 学位论文  OAI收割
博士, 北京: 中国科学院研究生院, 2012
秦晶
收藏  |  浏览/下载：39/0  |  提交时间：2014/05/07
河南省资源、环境与经济社会协调发展研究——基于系统承载能力测度理论 学位论文  OAI收割
博士后, 北京: 中国科学院研究生院, 2012
马歆
收藏  |  浏览/下载：30/0  |  提交时间：2014/05/15
Design of semi-physical simulation for small satellite by virtual display (EI CONFERENCE) 会议论文  OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
Xu K.; Lv Y.; Jin G.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However  the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment  the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology  the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment  the simulation computer  high-precision single-axis air-bearing turntable  reaction wheel  air thrust device  fiber gyroscopes  sensors synchronizer  power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time  Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient. (2012) Trans Tech Publications  Switzerland.  
Study of horizontal shafting with spherical four-way structure (EI CONFERENCE) 会议论文  OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
作者:  Yang L.;  Yang L.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Altazimuth photoelectric theodolite level shaft U-type and T-type structure  but with the expanding field of applications of photoelectric theodolite  the horizontal shaft structure occur great changes. For example  in the marine environment  shipboard conditions  the instrument has a waterproof  corrosion-resistant  easy maintenance and other functions  while carrier-based optoelectronic devices from a single visible television configure the development of integrated infrared system and ranging system as one of the single-station measurement system  due to the spherical structure has sufficient internal space exactly adapted to this need. In this paper  the horizontal axis of a spherical four-way structure. From aspects of the spherical four-way split in the form and shafting design and finite element analysis of the detailed design. A spherical four-way horizontal axis system  diameter 550mm  weight 19kg sphere  in the 40kg load  the maximum deformation of 3.3m  fully meet the requirements. The shaft of the structure of the shaking is less than 2 arc seconds  the vibration test  the re-examination instrument accuracy change is less than 1 arc seconds. Verify that the structure is stable and reliable. 2012 IEEE.  
The application of MATLAB/ embedded IDE Link CC in the design of DSP system (EI CONFERENCE) 会议论文  OAI收割
2011 4th International Conference on Intelligent Computation Technology and Automation, ICICTA 2011, March 28, 2011 - March 29, 2011, Shenzhen, Guangdong, China
Le S.; Shu-Mei Z.; Xin L.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25