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浏览/检索结果: 共16条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Modeling of projectile penetrating fiber-reinforced concrete via the continuum discontinuum element method 期刊论文  OAI收割 ENGINEERING FRACTURE MECHANICS, 2022, 卷号: 276, 页码: 17 作者:  Sun, Bowen;  Han, Fei;  Feng C(冯春);  Mei, Yong;  Sun, Yunhou   |  收藏  |  浏览/下载：44/0  |  提交时间：2023/02/03 CDEM  Fiber-reinforced concrete  Penetration  Crack width  Weibull distribution   Niche width of above- and below-ground organisms varied in predicting biodiversity profiling along a latitudinal gradient 期刊论文  OAI收割 MOLECULAR ECOLOGY, 2020, 卷号: 29, 期号: 10, 页码: 1890-1902 作者:  Feng, Kai;  Wang, Shang;  Wei, Ziyan;  Wang, Zhujun;  Zhang, Zhaojing   |  收藏  |  浏览/下载：18/0  |  提交时间：2021/09/15 above- and below-ground ecology  biodiversity profiling  biogeographical distribution  forest ecosystem  niche width model  plants and microbes   Analysis of growth, carbohydrate and photosynthetic characteristics of Vallisneria natans (Lour.) Hara induced by a change in water depth 期刊论文  OAI收割 FUNDAMENTAL AND APPLIED LIMNOLOGY, 2019, 卷号: 193, 期号: 2, 页码: 155-165 作者:  Wei, Hua   |  收藏  |  浏览/下载：70/0  |  提交时间：2020/04/07 aquatic plant  leaf width and thickness  macrophytes  mesocosm  root distribution  reserve-carbo-hydrates   Finite element analysis of infrared thermal imaging for four-layers structure of human thigh 期刊论文  OAI收割 Chinese Optics, 2018, 卷号: 11, 期号: 2, 页码: 237-247 作者:  Liu, Hong-Yan;  Sun, Qiang   |  收藏  |  浏览/下载：14/0  |  提交时间：2019/09/17 Finite element method  Blood  Full width at half maximum  Heat generation  Heat transfer  Infrared imaging  Medical imaging  Temperature distribution  Tumors   Observation of critical behavior of ultra-cold Bose gas in a magnetic trap 期刊论文  OAI收割 ACTA PHYSICA SINICA, 2016, 卷号: 65, 期号: 11 作者:  Wang Bing;  Zhu Qiang;  Xiong De-Zhi;  Lu Bao-Long 收藏  |  浏览/下载：28/0  |  提交时间：2016/10/08 critical region  critical behavior  phase transition temperature  full width at half maximum of momentum distribution   Effect of wave spectrum width on the probability density distribution of wind-wave heights CNKI期刊论文  OAI收割 2015 作者:  Liu YH(刘亚豪);  Hou YY(侯一筠);  Hu P(胡珀);  Liu Z(刘泽)   |  收藏  |  浏览/下载：1/0  |  提交时间：2024/12/18 wave-spectrum width  probability distribution of wave heights  significant wave height   Effect of wave spectrum width on the probability density distribution of wind-wave heights 期刊论文  OAI收割 CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, 2015, 卷号: 33, 期号: 5, 页码: 1124-1131 作者:  Liu Yahao;  Hou Yijun;  Hu Po;  Liu Ze 收藏  |  浏览/下载：82/0  |  提交时间：2015/12/07 wave-spectrum width  probability distribution of wave heights  significant wave height   Statistical study of the pulse width distribution for radio pulsars 期刊论文  OAI收割 SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2010, 卷号: 53, 期号: 增刊1, 页码: 220-223 作者:  Chen JianLing;  Wang Na;  Yuan JianPing;  Wang HongGuang;  Yan WenMing 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/06 pulsar  pulse width  emission beam  random distribution   A high-speed acquisition and processing system of the laser speckle signal on the magnetic fluid (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China 作者:  Sun Y.;  Sun Y.;  Wan Q.-H. 收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25 In order to achieve the dynamical detection and real-time analysis of the movement status of the magnetic fluid  according to the difficulties of the detection of the magnetic fluid  established a high-speed acquisition and processing system of laser speckle signal on the magnetic fluid. First of all  the FPGA (EP2C8T144C8N) drived the linear array CCD(TCD1501D) to scan in the corresponding time sequence given by the computer  collected the laser speckle interferometric image in rapid change on the surface of the magnetic fluid  which followed the movement of the magnetic fluid  and the signal collected by CCD was converted into the digital data through the high-speed A/D convertor and stored into the internal buffer FIFO of the FPGA  whose width and depth were designed by the user as required. Then  the FPGA sent the digital signal of the laser speckle interferometric images into the computer through the USB2.0 highspeed differential bus  whose transmission rate can reach 480Mb/s in theory. Finally  the distribution of the laser speckle on the magnetic fluid was messy and random  which carried certain information about the surface of the magnetic fluid  based on the theories of the statistic correlation and the subdivision of images  analysing and processing the laser speckle interferometric images  indirectly got the movement status of the magnetic fluid under the electromagnetic field. The experimental results show that: the High Speed Acquisition and Processing System has the advantage of full-court  non-contact  non-invasive  high-precision and high reliability and so on. The detection resolution of high speed acquisition and processing system is superior to 1m and the sample rate is 3Msps  which basically meets the requirements of the magnetic fluid movement state detection. 2009 SPIE.   Key techniques of laser direct writing of fine lines on the spherical surface (EI CONFERENCE) 会议论文  OAI收割 ICO20: Optical Design and Fabrication, August 21, 2005 - August 26, 2005, Changchun, China Liang F.; Hu J. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 The main principles of laser direct writing (LDW) system for lines on the spherical surface (SS) are discussed. It is pointed out that line profile is determined by the exposure dose distribution  which lies on the light intensity distribution of focus plane and the scanning speed. To improve the quality of line profile on the SS  several key techniques as follows are introduced. Firstly  the unique system configuration  four axes mutually intersecting at the center of the SS  is adopted  which ensures the shape of the focus be maintained circular during the writing period. Secondly  an automatic focus system (AFS) with the function of automatic focus in a certain range is introduced. Thirdly  to guarantee the linear velocity to accord with the exposure character of the photoresist all the time  an efficient arithmetic that controls motors run at appropriate angular velocity in different latitude is developed. Finally  to achieve a stable and well-behaved system so as to compensate the velocity instability resulting from unavoidable errors of mechanical and electronics factor  a powerful programmable multi-axis controller (PMAC) is utilized as the kernel element of the servocontrol system  and the curves of step response and parabolic response achieved by feedforward and PID loop tuning indicate that the location precision and velocity stability have reached a high level. The experimental results of LDW of lines on the SS work piece with a diameter 30 mm and a radius equal to 100 mm are given. The section analysis of the lines on the photoresist by the atomic force microscope (AFM) after exposure and development is performed. The results show that line width is about 3.0 m  and the steep sides of the lines are parallel to each other.