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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 基于牛角瓜基因组解析其种子纤维发育和镉胁迫响应的机理 学位论文  OAI收割 : 中国科学院大学, 2022 作者:  杨景雅   |  收藏  |  浏览/下载：18/0  |  提交时间：2024/05/14 牛角瓜，基因组，比较基因组，纤维发育，镉胁迫，分子机制  Calotropis, Genomics, Comparative genome, Fiber development, Cadmium stress, Molecular mechanism.   典型小分子气体污染物室温催化氧化降解过程的研究 学位论文  OAI收割 北京: 中国科学院大学；中国科学院生态环境研究中心, 2021 作者:  潘菊霜   |  收藏  |  浏览/下载：21/0  |  提交时间：2022/06/17 锰复合材料，环境水，Hcho 催化氧化，Co 催化氧化，反应机理  Manganese Composite Oxide, Environmental Water, Hcho Oxidation, Co Oxidation, Reaction Mechanism.   挥发性有机物氧化生成二次有机气溶胶的研究 学位论文  OAI收割 北京: 中国科学院生态环境研究中心, 2018 作者:  马朋坤   |  收藏  |  浏览/下载：143/0  |  提交时间：2019/07/16 挥发性有机物,大气氧化,二次有机气溶胶,形成机理 Volatile Organic Compounds, Atmospheric Oxidation, Secondary Organic Aerosols, Formation Mechanism.   二硫化钼/氧化石墨烯复合二维纳米材料的抗肿瘤应用及生物安全性评价 学位论文  OAI收割 北京: 中国科学院大学, 2017 作者:  刘赟   |  收藏  |  浏览/下载：89/0  |  提交时间：2018/06/28 二硫化钼  氧化石墨烯  Grapheneoxide  复合纳米材料  Nanocomposites  生物相容性  Biocompatibility  肺靶向  Lung Targeting  毒性机制  Toxic Mechanism.  Molybdenumdisulfide   毒性有机污染物与NO3/N2O5的大气化学反应研究 学位论文  OAI收割 博士, 北京: 中国科学院研究生院, 2015 作者:  王友峰 收藏  |  浏览/下载：97/0  |  提交时间：2016/08/09 气溶胶质谱，非均相反应，农药，多环芳烃，反应机理，aerosol mass spectrometer, heterogeneous reaction, pesticide, PAHs, reaction mechanism.   Field-line coupling interference prediction of LCD module in high-power TEA CO2 laser system (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 Ge X.; Li X. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 In high power TEA CO2 laser system  liquid crystal display (LCD) module is a key device for display and control functions. Because of laser's harsh electromagnetic environment  LCD module coupled to the electromagnetic interference easily  leading to not work normally. This paper analyzed the interference coupling mechanism. On the basis of the analysis results  LCD module's field-line coupling is calculated by Taylor form's BLT equation. The calculation result is verified by experiment. The results show that  due to the field-line coupling  the data line of LCD module existed interference voltage  interference voltage value is 1V. The interference voltage is larger than the LCD module's noise margin. LCD module must shield the interference. 2012 IEEE.   The parameter optimization of missile actuator based on spatial RSSR linkage mechanism (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China Ge M.; Han X.; Jia H. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 Analyzed the forms of movement of missile actuator based on spatial RSSR linkage mechanism. To achieve synchronic output of each axis  applied the multi-body dynamic application ADAMS to realize its parametric modeling and optimization  finally got the appropriate parameters to satisfy the performance. Then  researched the parameters affection to synchronic performance completed the initial design of the actuator transmission system. 2011 IEEE.   Design of motion adjusting system for space camera based on ultrasonic motor (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China 作者:  Sun Z. 收藏  |  浏览/下载：85/0  |  提交时间：2013/03/25 Drift angle is a transverse intersection angle of vector of image motion of the space camera. Adjusting the angle could reduce the influence on image quality. Ultrasonic motor (USM) is a new type of actuator using ultrasonic wave stimulated by piezoelectric ceramics. They have many advantages in comparison with conventional electromagnetic motors. In this paper  some improvement was designed for control system of drift adjusting mechanism. Based on ultrasonic motor T-60 was designed the drift adjusting system  which is composed of the drift adjusting mechanical frame  the ultrasonic motor  the driver of Ultrasonic Motor  the photoelectric encoder and the drift adjusting controller. The TMS320F28335 DSP was adopted as the calculation and control processor  photoelectric encoder was used as sensor of position closed loop system and the voltage driving circuit designed as generator of ultrasonic wave. It was built the mathematic model of drive circuit of the ultrasonic motor T-60 using matlab modules. In order to verify the validity of the drift adjusting system  was introduced the source of the disturbance  and made simulation analysis. It designed the control systems of motor drive for drift adjusting system with the improved PID control. The drift angle adjusting system has such advantages as the small space  simple configuration  high position control precision  fine repeatability  self locking property and low powers. It showed that the system could accomplish the mission of drift angle adjusting excellent. 2011 SPIE.   Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China Gu S.; Yan Y.; Xu K.; Jin G. 收藏  |  浏览/下载：48/0  |  提交时间：2013/03/25 With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.   Accuracy analysis and optimization design of constant-diameter cam (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China Yuan G.-Q.; Ding Y.-L.; Hui S.-W.; Liu Z.-H.; Li Y.-W. 收藏  |  浏览/下载：35/0  |  提交时间：2013/03/25 A constant-diameter cam gets its name because the centers of the rollers are a constant distance apart. This paper presents an Accuracy analysis and optimization design method for constant-diameter cam mechanism. Factors affecting the accuracy of cam are studied in the paper. The influences of the roller radial runout  cam machining error and the base circle radius on accuracy are analyzed. Then  a method to guarantee the cam diameter constant and remove return stroke error is studied using least-squares method. The analysis results indicate that the focusing accuracy can reach 4.4m  and the return stroke error can reach 4.8m the functioning of institutions is stable and reliable. 2011 IEEE.