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321.
以二值形态运算中平移变换的作用为引导,赋予代数格上的自同构群可交换的特性,使得形态算子的表示更为明确.在此基础上研究了代数格上形态算子的表示定理,并将这种思想运用于Matheron二值形态算子表示定理与极小内核表示定理的证明中. 相似文献
322.
考虑到孔压静力触探(CPTU)能够同时获取静力触探(CPT)及孔隙水压力测试结果,结合济宁-徐州高速公路液化场地CPT和CPTU测试资料,采用我国规范法、通用Robertson法(CPT法)和Juang法(CPTU法)对场地进行了液化评价.利用CPTU土分类图及其状态指标等值线、超孔压、归一化超孔压和新的联合图法对土体... 相似文献
323.
益生菌对健康有促进作用,乳制品中的益生菌的数量已成为评价其质量优劣的重要标准.建立简单快速益生菌定量检测方法很有必要.就乳制品中益生菌数量测定方法的研究现状和发展趋势进行了综述. 相似文献
324.
基于枝晶生长动力学模型(KGT模型),运用晶核自由生长理论计算了在添加细化剂条件下铸态AZ91合金组织的平均晶粒尺寸,并对该模型进行了基于实测数据(以Al-Sr-Mn-Ti-C为细化剂)的有效性分析。结果表明,模型计算值与实测值吻合良好,在细化剂粒子尺寸分布为已知的前提下,利用KGT模型预测异质形核过程中Mg-Al系合金铸态组织的平均晶粒尺寸是可行的。 相似文献
325.
WenRui Hu Mian Long Qi Kang JingChang Xie MeiYing Hou JianFu Zhao Li Duan ShuangFeng Wang 《科学通报(英文版)》2009,54(22):4035-4048
Microgravity fluid physics is an important part of microgravity sciences, which consists of simple fluids of many new systems, gas-liquid two-phase flow and heat transfer, and complex fluid mechanics. In addition to the importance of itself in sciences and applications, microgravity fluid physics closely relates to microgravity combustion, space biotechnology and space materials science, and promotes the developments of interdisciplinary fields. Many space microgravity experiments have been performed on board the recoverable satellites and space ships of China and pushed the rapid development of microgravity sciences in China. In the present paper, space experimental studies and the main results of the microgravity fluid science in China in the last 10 years or so are introduced briefly. 相似文献
326.
Influence of aerosol on regional precipitation in North China 总被引:1,自引:0,他引:1
The possible anthropogenic aerosol effect on regional precipitation is analyzed based on the historical data of precipitation
and visibility of North China. At first, the precipitation amounts from 1960 to 1979 are considered as natural background
values in our study for relatively less intensive industrial activities and light air pollution during that period of time,
then the region is divided into different subregions by applying the clustering method including the significance test of
station rainfall correlations to the time series of 10-day mean rainfall amounts in this period. Based on the rule that the
precipitation characteristics are similar in the same clustering region, the correlation of precipitation amounts among all
stations in each region is thus established. Secondly, for the period from 1990 to 2005, during which, the economy had experienced
a rapid development in this region, the variations of visibility at each station are analyzed. The stations with the absolute
change in visibility less than 0.1 km/a are used as the reference stations, at which it is assumed that precipitation has
not been seriously influenced by anthropogenic aerosols. Then the rainfall amounts of reference stations are used to estimate
the natural precipitation values of the other stations in each clustering region. The difference between estimated precipitation
and measured precipitation amount is thought to result from changes in anthropogenic aerosols. These changes in precipitation
amounts caused by anthropogenic aerosols at each station are calculated using the 10-day mean rainfall values from 1990 to
2005. The analysis results obtained with this method are remarkable if it passes the significance test, and therefore, the
suppression of regional precipitation over the region by anthropogenic aerosol is proved. It is found that this effect is
most remarkable in summer. The influence of anthropogenic aerosols on convective precipitation possibly plays an important
role in this season.
Supported by National Basic Research Program of China (Grant No. 2006CB403706) and National Natural Science Foundation of
China (Grant No. 40475003) 相似文献
327.
松花江水污染模型的数值研究 总被引:1,自引:0,他引:1
研究参考文献[4]中干支流水系统所建立的反应扩散方程组.使用傅里叶级数方法,在不同条件下对此方程组的解进行数值模拟. 相似文献
328.
The problem of finite-time practical stability (FTPS) for time-varying polytopic systems is discussed. Three equivalent conditions for FTPS are first proposed. To facilitate the system analysis, a sufficient linear matrix inequality (LMI) criterion on the FTPS is further provided. The definition of finite-time practical boundedness and a sufficient LMI criterion are also provided to overcome the exogenous disturbance. A numerical example is used to illustrate the effect of the proposed approach. 相似文献
329.
Performance analysis of Turbo-Codes in communication channels with impulsive noise 总被引:1,自引:0,他引:1 下载免费PDF全文
Performance of Turbo-Codes in communication channels with impulsive noise is analyzed. First, mathematical model of impulsive noise is presented because it has non-Gaussian nature and is found in many wireless channels due to impulsive phenomena of radio-frequency interference. Then, with linear Log-MAP decoding algorithm for its low complexity, Turbo-Codes are adopted and analyzed in such communication channels. To confirm the performance of the proposed method, simulations on both static and fully interleaved fiat Rayleigh fading channels with impulsive noise have been carried out. It is shown that Turbo-Codes have a better performance than the conventional methods (e.g. convolutionally coded system). 相似文献
330.
DDFS spurious signals due to amplitude quantization in absence of phase-accumulator truncation 下载免费PDF全文
Spurious signals in direct digital frequency synthesizers (DDFSs) are partly caused by amplitude quantization and phase truncation, which affect their application to many wireless telecommunication systems. Thee signals are deterministic and periodic in the time domain, so they appear as line spectra in the frequency domain. Two types of spurious signals due to amplitude quantization are exactly formulated and compared in thetime and frequency domains respectively. Then the frequency spectra and power levels of the spurious signals due to amplitude quantization in the absence of phase-accumulator truncation are emphatically analyzed, and the effects of the DDFS parameter variations on the spurious signals are thoroughly studied by computer simulation. And several important conclusions are derived which can provide theoretical support for parameter choice and spurious performance evaluation in the application of DDFSs. 相似文献