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浏览/检索结果: 共26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发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 The marine environmental microbiome mediates physiological outcomes in host nematodes 期刊论文  OAI收割 BMC BIOLOGY, 2024, 卷号: 22, 期号: 1, 页码: 27 作者:  Xue, Yiming;  Xie, Yusu;  Cao, Xuwen;  Zhang, Liusuo   |  收藏  |  浏览/下载：10/0  |  提交时间：2024/12/20 Litoditis marina  Full-length 16S rRNA sequencing  Marine bacterial collection  Host-microbe interactions  Metabolic models  Gene knockout  Gut microbiota   Length-squared L-function for identifying clustering pattern of network-constrained flows 期刊论文  OAI收割 INTERNATIONAL JOURNAL OF DIGITAL EARTH, 2023, 卷号: 16, 期号: 2, 页码: 4191-4211 作者:  Fang, Zidong;  Shu, Hua;  Song, Ci;  Chen, Jie;  Liu, Xiaohan   |  收藏  |  浏览/下载：38/0  |  提交时间：2023/11/29 Network-constrained flow  clustering pattern  network distance  Ripley's K-function  length-squared L-function   Design of the real-time autofocusing system for collimator with long focus length and large aperture (EI CONFERENCE) 会议论文  OAI收割 2011 International Academic Conference on Numbers, Intelligence, Manufacturing Technology and Machinery Automation, MAMT 2011, December 24, 2011 - December 25, 2011, Wuhan, China 作者:  Zhang X.;  Zhang X.;  Zhang X. 收藏  |  浏览/下载：46/0  |  提交时间：2013/03/25 Large aperture collimator which has been widely used for calibrating and testing various optical devices plays an essential role in correlative laboratories. As being the basic testing and calibration equipment  the large aperture collimator's accuracy should be much higher than the device under testing in order to ensure the accuracy of the measurement. However  the process of adjusting the collimator is extremely complicated due to the collimator's large aperture and long focal length. So it is difficult to ensure the measurement's quality and easy to cause the system being vulnerable to the surrounding environment. One of the most common problems is defocus. In order to solve the problem above  this issue presents a new type of autocollimator autofocusing system which uses pentaprism instead of using large-aperture plane mirror  semiconductor lasers as light source and CCD sensor as receiver. The system is smaller  lighter  and more convenient when using. The computer simulation shows that the autofocusing system's resolution could reach the accuracy of 40m. If we use the relevant algorithms to execute the sub-pixel scanning  the resolution could reach the accuracy of 10m. It shows that the system could satisfy the required testing precision of testing large aperture optical device.   Stiction of flexural MEMS structures 会议论文  OAI收割 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012, Guangxi, China, AUG 01-02, 2012 作者:  Liu Y;  Zhang Y(张吟) 收藏  |  浏览/下载：27/0  |  提交时间：2013/02/26 Adhesion  Boundary conditions  Composite micromechanics  Manufacture  Stiction  Variational techniques  Beam bending  Beam deflection  Beam length  Constraint conditions  Contact areas  Contact separation  Elastic energy  External loads  Matching condition  MEMS-structure  Micro-cantilevers  Microcantilever beams  Principle of virtual work  Rayleigh-Ritz methods  S shape  S-shaped  Significant impacts  Variational methods   SPECIES IDENTIFICATION OF TEN COMMON FARM ANIMALS BASED ON MITOCHONDRIAL 12S rRNA GENE POLYMORPHISMS 期刊论文  OAI收割 ANIMAL BIOTECHNOLOGY, 2012, 卷号: 23, 期号: 3, 页码: 213-220 作者:  Chen SY;  Yao YG;  Liu YP[*] 收藏  |  浏览/下载：29/0  |  提交时间：2012/09/11 12S rRNA gene  Farm animals  Mitochondrial DNA  Restriction fragment length polymorphism  Species identification   Bacterial diversity in surface water of the Yellow Sea during and after a green alga tide in 2008 CNKI期刊论文  OAI收割 2011 作者:  Guo C(郭丛);  Li FC(李富超);  Jiang P(姜鹏);  Liu ZP(刘兆普);  Qin S(秦松)   |  收藏  |  浏览/下载：6/0  |  提交时间：2024/12/18 Ulva prolifera  16S rRNA gene  restriction fragment length polymorphism (RFLP)  operational taxonomic unit (OTU)   Bacterial diversity in surface water of the Yellow Sea during and after a green alga tide in 2008 期刊论文  OAI收割 CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, 2011, 卷号: 29, 期号: 6, 页码: 1147-1154 作者:  Guo Cong;  Li Fuchao;  Jiang Peng;  Liu Zhaopu;  Qin Song   |  收藏  |  浏览/下载：20/0  |  提交时间：2012/07/03 Ulva Prolifera  16s Rrna Gene  Restriction Fragment Length Polymorphism (Rflp)  Operational Taxonomic Unit (Otu)   Research on lightweight outer baffle for coaxial space camera (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China 作者:  Zhang L.;  Zhang L. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 Stray light is non-imaging light that reach the optical system imaging plane. The non-imaging light can be received by detector if it is not effectively controlled  and stray light which directly irradiates on the detector has great influence on the imaging quality. Stray light can be effectively inhibited  if the outer baffle of space camera is designed optimally. Carbon fiber composite material is chosen as main material to meet requirements of a coaxial space optical system. The outer baffle should have advantages  such as lightweight  high stiffness and dimensional stability  etc. Using optimization design tools  the lightweight outer baffle is designed. And finite element method is used to check the structure. Development and test results show that the outer baffle with a diameter of 620mm and a total length of 1200mm only weighs 7.3kg. And the baffle's natural frequency reaches 88Hz  and it can satisfy the requirements of the space camera. 2011 IEEE.   Iterative Binomial Synthesis of Monodisperse Polyfluorenes up to 64-mers and Their Chain-Length-Dependent Properties 期刊论文  OAI收割 macromolecules, 2011, 卷号: 44, 期号: 6, 页码: 1256-1260 Wang QL; Qu Y; Tian HK; Geng YH; Wang FS 收藏  |  浏览/下载：22/0  |  提交时间：2012/06/11 EFFECTIVE CONJUGATION LENGTH  POLY(9  MOLECULAR SCALE WIRES  9-DI-N-OCTYL-2  FIELD-EFFECT MOBILITY  7-FLUORENE)  POLYMERS  POLY(3-HEXYLTHIOPHENE)  OLIGOTHIOPHENES  OLIGOMERS  POLY(3-BUTYLTHIOPHENE)  ETHYNYLENE)S   Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE) 会议论文  OAI收割 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China 作者:  Zhang X.;  Zhang X.;  Zhang X. 收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25 The imaging quality of seeker in flight mode has been evaluated through analyzing the effects of missile flutter on optical modulation transfer function (MTF) of the optical system. Firstly the data of transverse vibration has been processed to eliminate the trend term caused by the trajectory  then obtained the displacement with two times trapezoidal integration. For the side rotation  the high frequency noise interference in the data has been filtered by using five-point moving average method. Took this model as the quivering rule between the object and the image  and then analyzed the effects of the transverse vibration and the side rotation on imaging quality through MTF. By calculation  the r.m.s value of the image motion caused by missile transverse vibration is 0.026mm  and the side rotation angle is 0.0044 . Through the establishment of two modulation transfer functions (MTF) of image random vibration and linear vibration  the results show that the image quality had declined  and the effect of transverse vibration on image quality is obvious. Through improving the rigidity of the missile and selection of small focal length optical system and shorten the time of exposure can improve the imaging quality of the seeker. 2010 IEEE.