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浏览/检索结果: 共44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 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：56/0  |  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.   Segmenting Microscopy Images of Multi-Well Plates Based on Image Contrast 期刊论文  OAI收割 MICROSCOPY AND MICROANALYSIS, 2017, 卷号: 23, 期号: 5, 页码: 932-937 作者:  Chen, Weiyang;  Li, Weiwei;  Dong, Xiangjun;  Liao, Bo;  Flavel, Matthew   |  收藏  |  浏览/下载：10/0  |  提交时间：2020/12/09 microscopy image  uneven illumination  bright field  multi-well plate  image segmentation   Segmenting Microscopy Images of Multi-Well Plates Based on Image Contrast 期刊论文  OAI收割 MICROSCOPY AND MICROANALYSIS, 2017, 卷号: 23, 期号: 5, 页码: 932-937 作者:  Chen, Weiyang;  Li, Weiwei;  Dong, Xiangjun;  Liao, Bo;  Flavel, Matthew   |  收藏  |  浏览/下载：16/0  |  提交时间：2020/12/09 microscopy image  uneven illumination  bright field  multi-well plate  image segmentation   Numerical simulation of electricity generation potential from fractured granite reservoir through vertical wells at Yangbajing geothermal field 期刊论文  OAI收割 energy, 2016, 卷号: 103, 页码: 290-304 作者:  Zeng, Yu-chao;  Zhan, Jie-min;  Wu, Neng-you;  Luo, Ying-ying;  Cai, Wen-hao 收藏  |  浏览/下载：38/0  |  提交时间：2016/12/05 Vertical well  Yangbajing geothermal field  Fractured granite reservoir  Heat production  Electric power   Numerical simulation of electricity generation potential from fractured granite reservoir through a single horizontal well at Yangbajing geothermal field 期刊论文  OAI收割 energy, 2014, 卷号: 65, 页码: 472-487 作者:  Zeng, Yu-Chao;  Wu, Neng-You;  Su, Zheng;  Hu, Jian 收藏  |  浏览/下载：17/0  |  提交时间：2016/11/03 Single horizontal well  Electricity generation potential  Fractured granite reservoir  Water mining  Yangbajing geothermal field   IMPACT OF THE SOUTH-TO-NORTH WATER DIVERSION PROJECT ON GROUNDWATER RESOURCES: A CASE STUDY IN PINGGU BASIN, BEIJING, CHINA 期刊论文  OAI收割 ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL, 2013, 卷号: 12, 期号: 11, 页码: 2239-2247 作者:  Xu, Haizhen;  Li, Ming;  Li, Guomin;  Zhang, Shouquan   |  收藏  |  浏览/下载：17/0  |  提交时间：2017/12/22 Groundwater  Numerical Model  South-to-north Water Diversion Project  Sustainability  Well Field   Effects of Measurement Method, Scale, and Landscape Features on Variability of Saturated Hydraulic Conductivity SCI/SSCI论文  OAI收割 2013 Hu W.; Shao M. G.; Wang Q. J.; She D. L. 收藏  |  浏览/下载：94/0  |  提交时间：2014/12/24 Spatial variability  Gully  Scale  Soil core method  Tension  infiltration method  Guelph permeameter method  well permeameter data  spatial variability  guelph permeameter  loess  plateau  tension infiltrometers  disc infiltrometers  physical-properties  field methods  soil  infiltration   Characteristics of electrical field and ion motion in surface-electrode ion traps 期刊论文  OAI收割 JOURNAL OF MASS SPECTROMETRY, 2012, 卷号: 47, 期号: 3, 页码: 286-293 作者:  Zhou, Xiaoyu;  Xu, Gaoping;  Xiong, Caiqiao;  Chen, Rui;  Qiao, Haoxue   |  收藏  |  浏览/下载：17/0  |  提交时间：2019/04/09 Surface-electrode Ion Trap  Electrical Potential  Trapping Well Depth  Field Center  Multipoles   On hyperspectral remotely sensed image classification based on MNF and AdaBoosting (EI CONFERENCE) 会议论文  OAI收割 2012 3rd IEEE/IET International Conference on Audio, Language and Image Processing, ICALIP 2012, July 16, 2012 - July 18, 2012, Shanghai, China 作者:  Yu P.;  Yu P.;  Gao X. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 As an effective statistical learning tool  AdaBoosting has been widely used in the field of pattern recognition. In this paper  a new method is proposed to improve the classification performance of hyperspectral images by combining the minimum noise fraction (MNF) and AdaBoosting. Because the hyperspectral imagery has many bands which have strong correlation and high redundancy  the hyperspectral data are pre-processed by the minimum noise fraction to reduce the data's dimensionality  whilst to remove noise bands simultaneously. Then  we use an AdaBoost algorithm to conduct the classification of hyperspectral remotely sensed image. Experimental results show that the classification accuracy is improved and the time of calculation is reduced as well. 2012 IEEE.   Optimum design of laser encoding and decoding on laser beam-riding guidance (EI CONFERENCE) 会议论文  OAI收割 2nd International Conference on Frontiers of Manufacturing and Design Science, ICFMD 2011, December 11, 2011 - December 13, 2011, Taichung, Taiwan 作者:  Yang L.;  Yang L. 收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25 Operating principle of laser beam-riding guidance was set forth. Based on the principle of spatial frequency-encoding  experimental results demonstrated that the receiver can receive correctly the encoded signal and can decode the signal  an optimum laser encoding mode was designed  measurement for the missdistance is feasible and all the performance parameters satisfy the demand. (2012) Trans Tech Publications  which can transfer continuous laser into pulse laser that represents different position information. Then the mathematic model of deviation from target is built  Switzerland.  a modified encoding pattern was presented  which is composed of two light paths crossed 90. Azimuth information of target is given in orthogonal coordinate system and deviation from target is linearity. As well as  characteristic distribution of spatial laser field is analyzed. Corresponding decoding mode was presented  by testing in 2 kilometers outdoor