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51.
由于郑东新区特殊的工程地质条件,长螺旋CFG(Cement Flyash Gravel)桩施工常常引起桩周土体开裂和周围建筑物开裂等施工事故。本文通过郑州某工地现场试验分析,否定了空桩效应引起桩周土体开裂的猜想,并分析了郑东新区由于CFG桩施工引起桩周土体开裂的原因。 相似文献
52.
Li XIE Lihua XIE 《系统科学与复杂性》2007,20(2):262-272
We consider the stability of a random Riccati equation with a Markovian binary jump coefficient. More specifically, we are concerned with the boundedness of the solution of a random Riccati difference equation arising from Kalman filtering with measurement losses. A sufficient condition for the peak covariance stability is obtained which has a simpler form and is shown to be less conservative in some cases than a very recent result in existing literature. Furthermore, we show that a known sufficient condition is also necessary when the observability index equals one. 相似文献
53.
Lanju XU 《系统科学与复杂性》2007,20(1):30-40
In the present paper, we focus on constructive spherical codes. By employing algebraic geometry codes, we give an explicit construction of spherical code sequences. By making use of the idea involved in the proof of the Gilbert-Varshamov bound in coding theory, we construct a spherical code sequence in exponential time which meets the best-known asymptotic bound by Shamsiev and Wyner. 相似文献
54.
55.
试论美国平等权利修正案的曲折历程 总被引:1,自引:0,他引:1
主张男女平等的平等权利修正案从提出之日起至今历经80多年, 尚未被批准和写入宪法, 这就意味着在美国这个世界上最发达的国家还没有在宪法上承认男女平等这一现代社会基本准则, --这不能不说是个悖论.本文就以美国平等权利修正案为研究主体, 概要勾勒美国平等权利修正案产生的背景、提出及失败、第二次女权运动中它的复兴而后再失败的基本脉络. 相似文献
56.
蒸汽机车锅炉水垢对机车的安全运行及工作效能有很大的影响,对蒸汽机车水垢的处理极其重要。蒸汽机车水垢是经过复杂的物理、化学变化而形成的。由于水垢的形成,造成锅炉的传热效率低,大量浪费燃料;降低锅炉出力危及锅炉安全运行;缩短使用寿命增大检修量,浪费工时、原料。为了缓解机车水垢的形成,可以采取尽量降低软化水硬度、确保洗修质量、合理安排排污时机和次数,提高排污效果等措施,并在实际运用中取得了一定的效果。 相似文献
57.
通过对西藏公务员工作满意度的调查,分析影响西藏公务员工作满意度的主要因素以及工作满意度体现在人口统计变量上的差异,并对此提出相应的对策建议。 相似文献
58.
59.
Rein Vihalemm 《Foundations of Science》2007,12(3):223-234
The philosophical analysis of chemistry has advanced at such a pace during the last dozen years that the existence of philosophy of chemistry as an autonomous discipline cannot be doubted any more. The present paper will attempt to analyse the experience of philosophy of chemistry at the, so to say, meta-level. Philosophers of chemistry have especially stressed that all sciences need not be similar to physics. They have tried to argue for chemistry as its own type of science and for a pluralistic understanding of science in general. However, when stressing the specific character of chemistry, philosophers do not always analyse the question ‘What is science?’ theoretically. It is obvious that a ‘monistic’ understanding of science should not be based simply on physics as the epitome of science, regarding it as a historical accident that physics has obtained this status. The author’s point is that the philosophical and methodological image of science should not be chosen arbitrarily; instead, it should be theoretically elaborated as an idealization (theoretical model) substantiated on the historical practice of science. It is argued that although physics has, in a sense, justifiably obtained the status of a paradigm of science, chemistry, which is not simply a physical science, but a discipline with a dual character, is also relevant for elaborating a theoretical model of science. The theoretical model of science is a good tool for examining various issues in philosophy of chemistry as well as in philosophy of science or science studies generally. 相似文献
60.
Global Optimization in Any Minkowski Metric: A Permutation-Translation Simulated Annealing Algorithm for Multidimensional Scaling 总被引:3,自引:1,他引:2
It is well known that considering a non-Euclidean Minkowski metric in Multidimensional Scaling, either for the distance model
or for the loss function, increases the computational problem of local minima considerably. In this paper, we propose an algorithm
in which both the loss function and the composition rule can be considered in any Minkowski metric, using a multivariate randomly
alternating Simulated Annealing procedure with permutation and translation phases. The algorithm has been implemented in Fortran
and tested over classical and simulated data matrices with sizes up to 200 objects. A study has been carried out with some
of the common loss functions to determine the most suitable values for the main parameters. The experimental results confirm
the theoretical expectation that Simulated Annealing is a suitable strategy to deal by itself with the optimization problems
in Multidimensional Scaling, in particular for City-Block, Euclidean and Infinity metrics. 相似文献