现在的 MIS 系统中基本上都离不开图片的处理,而把图片直接写入数据库的 Image 类型字段中,将是一个主流的应用方向。本文首先讨论了 MIS 系统中图片存储干数据库中的意义和优点;其次指出图片上传到系统时存在强占存储空间的问题;在此...现在的 MIS 系统中基本上都离不开图片的处理,而把图片直接写入数据库的 Image 类型字段中,将是一个主流的应用方向。本文首先讨论了 MIS 系统中图片存储干数据库中的意义和优点;其次指出图片上传到系统时存在强占存储空间的问题;在此基础上再介绍了利用.Net Framework 2.0技术的 Drawing 命名空间下的类,改变上传图片大小的方法。展开更多
A close relation between gravitational waveforms and the types of trajectories in a superposed field between a pseudo-Newtonian Kerr black hole and quadrupolax halos is shown in detail.The gravitational waveforms emit...A close relation between gravitational waveforms and the types of trajectories in a superposed field between a pseudo-Newtonian Kerr black hole and quadrupolax halos is shown in detail.The gravitational waveforms emitted from circular,KAM tori and chaotic orbits must be periodic,quasiperiodic and stochastic,respectively.The chaotic motion can maximally enhance both the amplitudes and the energy emission rates of the waves.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.10873007 and 11173012
文摘A close relation between gravitational waveforms and the types of trajectories in a superposed field between a pseudo-Newtonian Kerr black hole and quadrupolax halos is shown in detail.The gravitational waveforms emitted from circular,KAM tori and chaotic orbits must be periodic,quasiperiodic and stochastic,respectively.The chaotic motion can maximally enhance both the amplitudes and the energy emission rates of the waves.
