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浏览/检索结果: 共25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 Additive hazard regression of event history studies with intermittently measured covariates 期刊论文  OAI收割 CANADIAN JOURNAL OF STATISTICS-REVUE CANADIENNE DE STATISTIQUE, 2021, 页码: 22 作者:  Sun, Xiaowei;  Song, Xinyuan;  Sun, Liuquan   |  收藏  |  浏览/下载：22/0  |  提交时间：2021/10/26 Additive hazard regression  event history data  intermittently measured covariates  kernel weighted estimation   The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文  OAI收割 Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870 作者:  HXMT   |  收藏  |  浏览/下载：55/0  |  提交时间：2022/02/08 stars: magnetic field  stars: neutron  pulsars: general  Astrophysics  - High Energy Astrophysical Phenomena  Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.   Land Surface Temperature and Emissivity Retrieval from Field-Measured Hyperspectral Thermal Infrared Data Using Wavelet Transform 期刊论文  OAI收割 REMOTE SENSING, 2017, 卷号: 9, 期号: 5, 页码: 16 作者:  Zhang, Yu-Ze;  Wu, Hua;  Jiang, Xiao-Guang;  Jiang, Ya-Zhen;  Liu, Zhao-Xia   |  收藏  |  浏览/下载：22/0  |  提交时间：2019/09/25 temperature and emissivity separation  hyperspectral  field-measured data  wavelet transform   Land Surface Temperature and Emissivity Retrieval from Field-Measured Hyperspectral Thermal Infrared Data Using Wavelet Transform 期刊论文  OAI收割 REMOTE SENSING, 2017, 卷号: 9, 期号: 5, 页码: 16 作者:  Zhang, Yu-Ze;  Wu, Hua;  Jiang, Xiao-Guang;  Jiang, Ya-Zhen;  Liu, Zhao-Xia   |  收藏  |  浏览/下载：22/0  |  提交时间：2019/09/25 temperature and emissivity separation  hyperspectral  field-measured data  wavelet transform   Land Surface Temperature and Emissivity Retrieval from Field-Measured Hyperspectral Thermal Infrared Data Using Wavelet Transform 期刊论文  OAI收割 REMOTE SENSING, 2017, 卷号: 9, 期号: 5, 页码: 16 作者:  Zhang, Yu-Ze;  Wu, Hua;  Jiang, Xiao-Guang;  Jiang, Ya-Zhen;  Liu, Zhao-Xia   |  收藏  |  浏览/下载：14/0  |  提交时间：2019/09/25 temperature and emissivity separation  hyperspectral  field-measured data  wavelet transform   Assessing the transferability of support vector machine model for estimation of global solar radiation from air temperature SCI/SSCI论文  OAI收割 2015 作者:  Chen J. L.;  Li, G. S.;  Xiao, B. B.;  Wen, Z. F.;  Lv, M. Q.   |  收藏  |  浏览/下载：26/0  |  提交时间：2017/11/09 Global solar radiation  Support vector machine  Air temperatures  Distance  Altitude  measured meteorological data  artificial neural-network  sunshine  duration  diffuse fraction  china  prediction  turkey  precipitation  simulations  validation   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：23/0  |  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   Assessing the potential of support vector machine for estimating daily solar radiation using sunshine duration SCI/SSCI论文  OAI收割 2013 Chen J. L.; Li G. S.; Wu S. J. 收藏  |  浏览/下载：21/0  |  提交时间：2014/12/24 Daily solar radiation  Sunshine duration  Models  Support vector  machine  Liaoning province  measured meteorological data  neural-networks  china  models  parameters  trends  kernel  turkey   Data-Based Controllability and Observability Analysis of Linear Discrete-Time Systems 期刊论文  OAI收割 IEEE TRANSACTIONS ON NEURAL NETWORKS, 2011, 卷号: 22, 期号: 12, 页码: 2388-2392 作者:  Wang, Zhuo;  Liu, Derong 收藏  |  浏览/下载：33/0  |  提交时间：2015/08/12 Controllability  data-based analysis  linear discrete-time systems  measured data  observability  unknown parameters   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：47/0  |  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.