排序方式: 共有17条查询结果,搜索用时 453 毫秒
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将理论分析与计算机数值模拟相结合,通过保角变换研究线电荷与带有直缝隙的接地无限大导体板所形成的电场,利用软件MATLAB绘制出其电场线和等势线图. 相似文献
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接触尘、毒作业的广大职工,因尘、毒的危害而影响着他们的健康,以至于生命。有计划、有步骤地治理尘、毒的危害,使之危害降到最低的限度,或者说治理达标(国际和国内标准),是各个具有尘、毒作业的工厂、企业劳动保护的首要问题,是市政领导部门进行劳动保护、安全生产的重点工作。问题是:需要进行达标治理的单位很多,总的治理投资是非常有限的。如何将有限的资金投入,获得最佳的治理效果?对这种投资决策,我们采用了0-1规划。其次,如何衡量治理效果?尘、毒种类很多,同一种尘、毒在不同的单位其危害大小也不一样。这样,就要求对各种尘、毒在不同工厂、企业的危害大小进行排序,排序本身就要求对尘、毒的 相似文献
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Method of determining cosmological parameter ranges with samples of candles with an intrinsic distribution 下载免费PDF全文
In this paper, the effect of the intrinsic distribution of cosmological candles is
investigated. We find that in the case of a narrow distribution the deviation of the
observed modulus of sources from the expected central value can be estimated within
a ceratin range. We thus introduce lower and upper limits of X2, X
min2 and Xmax2 to estimate cosmological parameters by
applying the conventional minimizing X2 method. We apply this method to a
gamma-ray burst (GRB) sample as well as to a combined sample including this GRB
sample and an SN Ia sample. Our analysis shows that: a) in the case of assuming an
intrinsic distribution of candles of the GRB sample, the effect of the distribution
is obvious and should not be neglected; b) taking into account this effect would
lead to a poorer constraint of the cosmological parameter ranges. The analysis
suggests that in the attempt of constraining the cosmological model with current GRB
samples, the results tend to be worse than was previously anticipated if the
mentioned intrinsic distribution does exist. 相似文献
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