用于中短期地震预报的一些地震活动性参量相关性讨论

在利用地震活动性图像预报地震的研究中，发展了众多定量描述活动图像特征的参量。用它们综合进行短期预报，其相互间的相关性是十分重要的。利用计算机产生地震发生的时间、位置和强度分别符合均匀分布、泊松分布、负指数分布、韦泊尔分布5个随机地震目录，以及华北地区无强震时段的天然地震目录，分别计算了b、C、D、Mf、N值随时间的变化，统计分析了其相关关系。结果认为，D值与N值呈显著相关；b值与Mf值呈显著性负相关。随机地震目录中，其他各参量（除个别外）均呈非显著性相关。而在华北天然地震目录中，其他各对参量均有不同程度的相关。在实际地震预报中应当考虑上述结果，并提出了某些建议。

含云大气单次散射参量极大相关k分布优选算法

针对高精度遥感应用中含云大气波段辐射传输计算成本较高的问题,提出单次散射参量极大相关k分布优选算法(SSP-MCKD)。通过分析不同环境条件下含云大气消光系数、单次反照率和不对称因子等参量在光谱分布上的相关性,将CKD理论从单一吸收系数扩展至多种光谱参量。根据对单次散射源函数的影响程度,优选各条谱线的极大相关光谱参量并进行分组重排,在组间和组内求解平均等效参量和求积权重。实验结果表明:与△logk算法和云层属性参数化的相关k分布算法相比,SSP-MCKD适用于吸收、半吸收和透过等各类波段,收敛速度最快;在不同高度云层场景中,辐射亮度平均误差低于2%;在不同类型云层场景中,辐射亮度平均误差低于6%。SSP-MCKD在适用性、稳定性及计算精度方面均具有明显优势。

冲击载荷形状对阻尼介质中结构最终塑性变形的影响

分析了在阻尼介质中当保持相关参量相同时，冲击载荷形状对简支刚塑性圆板和圆柱薄壳的最终塑性变形的影响。在结构物高载阶段的运动中，考虑了阻尼介质对塑性铰区移行的影响。结果表明：在阻尼介质中，文献［６］中相关参量的概念仍然可以沿用，但结构的最终塑性变形与相关参量的关系式Ｗ＿ｏｆ＝Ｉ￣２＿ｅＧ（Ｐ＿ｅ）应由更一般的表达式来代替。

Correlation of the quantifiable parameters of blood flow pattern derived with dynamic CT in solitary bronchogenic adenocarcinoma

Objective:To evaluate the correlation of the quantifiable parameters of blood flow pattern derived with dynamic CT in solitary bronchogenic adenocarcinoma(SBA).Methods:46 patients with solitary bronchogenic adenocarcinomas (SBA)(diameter≤4 cm)underwent multi-location dynamic contrast material-enhanced(nonionic contrast material was administrated via the antecubital vein at a rate of 4 mL/s by using an autoinjector 90 mL,4×5 mm or 4×2.5 mm scanning mode with stable table were performed)serial CT.Precontrast and postcontrast attenuation on every scan was recorded.Perfusion (PBA),peak height(PHBA),ratio of peak height of the SPN to that of the aorta(BA-to-A ratio)and mean transit time(MTT)were calculated.The correlation between peak height of the aorta(PHA)and parameters of the SBA(PHBA,BA-to-A ratio,PBA,and MTT)and those among parameters of the SBA were assessed by means of linear regression analysis.Regression equation among parameters of the SBA were obtain by means of stepwise regression.Results:The correlation between the SBA peak height(PHBA,36.78 HU±12.02)and the aortic peak height(PHA)was significant(r=0.506,P<0.0001).No significant cor- relation was found between the BA-to-Apeak height ratio(15.33%±4.55)and the aortic peak height(r=0.130,P=0.388> 0.05)as it was between the SBA perfusion(PBA,31.86 mL/min/100 g±9.74)and the aortic peak height(r=0.049,P=0.749 >0.05).The SBA perfusion correlated with the PHBA and the BA-to-A peak height ratio(r=0.394,P=0.007<0.05;r=0.407, P=0.005<0.05).The PHBA correlated positively with the BA-to-A peak height ratio(r=0.781,P<0.0001).Mean transit time was 14.84 s±5.52.PBA=18.500+0.872×BA-to-A ratio.BA-to-A ratio=4.467+0.295×PHBA.Conclusion:The linear correlation between the SBA perfusion and BA-to-Aratio and that between BA-to-Aratio and PHBA can be expressed by equation. It is possible to design a simpler scanning procedure of investigation of bronchogenic adenocarcinoma angiogenesis.

Multi-objective optimisation of a vehicle energy absorption structure based on surrogate model

In order to optimize the crashworthy characteristic of energy-absorbing structures, the surrogate models of specific energy absorption （SEA） and ratio of SEA to initial peak force （REAF） with respect to the design parameters were respectively constructed based on surrogate model optimization methods （polynomial response surface method （PRSM） and Kriging method （KM））. Firstly, the sample data were prepared through the design of experiment （DOE）. Then, the test data models were set up based on the theory of surrogate model, and the data samples were trained to obtain the response relationship between the SEA ＆amp; REAF and design parameters. At last, the structure optimal parameters were obtained by visual analysis and genetic algorithm （GA）. The results indicate that the KM, where the local interpolation method is used in Gauss correlation function, has the highest fitting accuracy and the structure optimal parameters are obtained as： the SEA of 29.8558 kJ/kg （corresponding toa=70 mm andt= 3.5 mm） and REAF of 0.2896 （corresponding toa=70 mm andt=1.9615 mm）. The basis function of the quartic PRSM with higher order than that of the quadratic PRSM, and the mutual influence of the design variables are considered, so the fitting accuracy of the quartic PRSM is higher than that of the quadratic PRSM.

液体激光器

TN248.34 2002064099调 Q 激光器速率方程的普适表达式=General expres-sion for the rate equation describing both activelyQ-switched lasers and passively Q-Switchedlrisers[刊,中]/任承,张行愚,王青圃,赵圣之(山东大学光电系.山东,济南(250100))∥光电子·激光.—2002,13(3).—294-296。

激光化学

TL253 2003064131激光激活化学反应分离同位素反应池参数确定及其影响=Determination of parameters of reaction cell for chemicalreaction isotope separation by a laser activation and the influenceon separation coefficient[刊,中]/李育德(四川大学光电系.四川,成都(610064)),陈梅…∥激光杂志.-2002,23(6).-34-36在气体分子运动论、碰撞理论、流体力学和光化学反应、热化学反应及高斯光束理论基础上建立了位于激光器腔内外的反应池的设计尺寸同各相关参量和同位素产物产率、同位素分离系数间的关系,并给出了一些计算结果。图2表1参3(杨妹清)

Extinction Time of a Metapopulation Driven by Colored Correlated Noises

The simplified incidence function model which is driven by the colored correlated noises is employed to investigate the extinction time of a metapopulation perturbed by environments. The approximate Fokker-Planck Equation and the mean first passage time which denotes the extinction time （Tex） are obtained by virtue of the Novikov theorem and the Fox approach. After introducing a noise intensity ratio and a dimensionless parameter R = D /α （D and a are the multiplicative and additive colored noise intensities respectively）, and then performing numerical computations, the results indicate that： （i） The absolute value of correlation strength A and its correlation time τ3 play opposite roles on the Tex; （ii） For the case of 0 〈λ〈 1,α and its correlation time τ2 play opposite roles on the Tex in which R〉 1 is the best condition, and there is one-peak structure on the Tex - D plot; （iii） For the case of-1 〈 λ≤ 0, D and its correlation time τ1 play opposite roles on the Tex in which R 〈 1 is the best condition and there is one-peak structure on the Tex - τ2 plot.

Research on Evenness of Woollen Cashmere Yarn

Parameters influencing the evenness of the woollen cashmere yarn were analyzed, and fifty batches of yams with fineness of 38.5 tex were used to study the quality control parameters in relation to the evenness. Through statistical analysis, the models of yarn evenness were built. Moreover, the relationship between the evenness of spinning yarn and roving yarn was also investigated. The results showed that a positive correlation existed between them, and the mount of thin place per kilometer was the most important factor which could influence the evenness of woollen cashmere yam. The influence of the amount of neps and thick place on the yam evenness was indistinctive. The conclusions obtained would be helpful to improve the precontrol ability on yarn evenness.