共查询到6条相似文献,搜索用时 0 毫秒
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分别利用Boltzmann函数和双曲正切函数两种数学模型对系列冲击试验中的试验数据进行拟合,得到了材料的冲击韧脆转变曲线,比较了这两种数学模型的优劣和适应性,并对数学模型中各参数的选择进行了讨论。结果表明:Boltzmann函数和双曲正切函数这两种数学模型是同一函数的不同表达式,在拟合冲击韧脆转变曲线过程中都具有同样良好的效果;当曲线上、下平台不明显时,合理地假设上、下平台值,是准确预测韧脆转变温度的前提。 相似文献
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线性等式约束下一般生长曲线模型参数阵的BLU估计 总被引:1,自引:1,他引:1
研究了线性等式约束下一般生长曲线模型,得到了条件线性可估函数的最优线性无偏估计,并证明了在几乎处处意义下是唯一的。 相似文献
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Ballesteros A. Strizhalo V. A. Grinik Eacute;. U. Novogrudskii L. S. Chirko L. I. Zemtsov M. P. 《Strength of Materials》2002,34(1):27-34
This paper considers the results of testing reactor steel JRQ involving determination of the fracture toughness and the reference temperature T0, construction of a Master Curve, and evaluation of the boundaries of regions with different failure probability. The tests were conducted on small specimens (1/2T) made from blocks of steel JRQ supplied by the IAEA within the framework of the Round Robin program. 相似文献
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The series of models of temperature sensors described are based on the concept of measuring computer-aided transducers, according to which measuring and computer-aided transducers are considered as a single device. 相似文献
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Quantum Nonlinear Sigma Model with a Damping Term; Finite Temperature Renormalization Group Analysis
We study the behavior of the finite temperature quantum nonlinear sigma model in two dimensions in the presence of the damping
of the formf (|θ
n
|) = γ|ω
n
|α, whereα satisfiesα ≥ 1. The analytical calculations will be performed usingα=2 and the results will be compared with the standard results obtained for the standard quantum nonlinear sigma model. The
behavior of such a system is connected with the pseudogap which appears in the normal state of the cuprate superconductors. 相似文献