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541.
张之立 《地震学报(英文版)》1994,7(1):43-54
InteractionamongfracturesandstressfieldcomputationoffracturesystemsZhi-LiZHANG(张之立)(InstituteofGeophysics,StateSeismologicalB... 相似文献
542.
电法勘探在经历了近一个世纪的发展后,其方法理论、仪器设备、野外数据采集、处理和解释等方面都经历了一系列重大变化.本文以方法理论的进展为主线,回顾、展望了目前电法勘探中几个重要而令人关注的研究焦点.这些问题的研究进展将会对21世纪的电法勘探产生深远的影响. 相似文献
543.
544.
Shaukat Goderya 《Astrophysics and Space Science》2002,282(1):121-130
Astronomical research with a small telescope (20 cm – 40 cm) has always been a challenging problem. The invention of CCD cameras
and personal computers has now put this question to past as small telescopes can do good and practicle science. This paper
describes the use of small telescope in the study of eclipsing binary stars. Binary stars play an important role as astrophysical
laboratories in our quest to understand the evolution and structure of stars. The most useful aspects of research with a small
telescope in binary star research is; 1) as a viable teaching laboratory for begining students 2) to teach and learn the fundamental
observational techniques that are common to many types of astronomical research areas 3) as a starting point to initiate research
programs in observational astronomy, optics, instrumentation, computational astrophysics and 4) as a foundation to develop
an infrastructure and technical know how for larger telescope facility.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
545.
In order to understand the forming mechanism of the radial abun- dance gradient of the Galactic disk and the evolution of cold gas, we have con- structed a chemical evolution model of the Galactic disk, in which the star for- mation law concerned with molecular hydrogens is adopted, and the evolution of mass surface density is calculated for the molecular and atomic hydrogens separately, then the model predictions and the observed radial distributions of some physical quantities are compared. The result indicates that the model prediction is sensitive to the adopted infall timescale, the model which adopts the star formation law concerned with the molecular hydrogens can agree well with the major observed properties of the Galactic disk, especially can obtain naturally the radial oxygen abundance gradient of the Galactic disk, and the radial surface density profile of cold gas. The assumption of instantaneous or non-instantaneous recycling approximation has a small effect on the evolution of cold gas, especially in the case of rather low gas density. 相似文献
546.
547.
We describe finite-difference approximations to the equations of 2-D electromagnetic induction that permit discrete boundaries to have arbitrary geometrical relationships to the nodes. This allows finite-difference modelling with the flexibility normally ascribed to finite-element modelling. Accuracy is demonstrated by comparison with finite-element computations. We also show that related approximations lead to substantially improved accuracy in regions of steep, but not discontinuous, conductivity gradient. 相似文献
548.
It has been found that the near-infrared flux variations of Seyfert galaxies satisfy relations of the form Fi ≈α i j +β i j Fj , where Fi , Fj are the fluxes in filters i and j ; and α i , j , β i , j are constants. These relations have been used to estimate the constant contributions of the non-variable underlying galaxies. The paper attempts a formal treatment of the estimation procedure, allowing for the possible presence of a third component, namely non-variable hot dust. In an analysis of a sample of 38 Seyfert galaxies, inclusion of the hot dust component improves the model fit in approximately half the cases. All derived dust temperatures are below 300 K, in the range 540–860 K or above 1300 K. A noteworthy feature is the estimation of confidence intervals for the component contributions: this is achieved by bootstrapping. It is also pointed out that the model implies that such data could be fruitfully analysed in terms of principal components. 相似文献
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550.
依据JJF1059.1-2012《测量不确定度评定与表示》,针对自动气象站各要素传感器的测量误差会随时间、温度等环境因素的变化而发生漂移.为确保观测数据的准确、可靠,以CP340恒温恒湿箱为湿度发生环境、采用英国michell公司的Optidew Vision精密露点仪为标准器,介绍了利用HMP155A温湿度传感器进行湿度测量不确定度评定的一般方法和详细步骤.最后给出一个评定实例,在温度为22℃和40℃,相对湿度为30% RH~75%RH时,通过对测量不确定度的各分量进行分析和计算,得到HMP155A温湿度传感器测量结果的扩展不确定度分别为1.50%和1.46%. 相似文献