图的直积和字典积的Laplacian谱和Kirchhoff指数

由图G1、G2的Laplacian谱得到了它们的直积G1×G2和字典积G1[G2]的Laplacian谱,并计算了R(G1×G2)和R(G1[G2]).     

Environmental Issues of Geothermal Development in Yangbajing, Tibet and the Countermeasures

The pollution source and pollution state of surface water is respectively assessed with equal-standard-pollution-load index and Nemero index, and the habitans' health is assessed as well by comparison with pre-development of geothermal field. Results show that: 1 ) Three pollutive factors obviously fail to attain the required standards and their order sorted by impact degree is As＞F- ＞S2-. 2) The Nemero index of Donggua cross section of Duilongqu River is 0. 725and the water quality is at mildly-polluted level. 3) In Lhasa River, the Nemero indexes of cross sections affected by geothermal fields are much higher than that of the unaffected one, which shows the present and potential impacts of geothermal development. 4) Much more inhabitants nearby got trichomadesis sickness after geothermal development, which shows that the surface water pollution in this area has threatened the inhabitants' health. In addition, other environmental issues caused by Yangbajing geothermal development are analyzed and some countermeasures are proposed.     

大整数因子分解新算法及对RSA密码制的解密

对一大类大整数的因子分解构造算法WZH,可在O(L(lnm)2)+O(lnm)3(L相似文献   

脂肪腈结构与凝聚型性能之间定量关系的研究

借助于分子拓扑学探讨了脂肪腈的凝聚型性能与分子结构之间的关系，提出一个结构基础明确的定量关系式．对乙腈到二十一烷腈的计算结果表明，沸点、密度和折光指数的计算值都很接近实验值．应用这一定量关系，不仅能够合理表征脂肪睛结构与凝聚型性能的关系，而且有助于揭示物质结构与性能关系之间的奥秘。     

GRAMMATICAL COMPLEXITY OF FEIGENBAUM TYPE ATTRACTORS IN PERIODIC WINDOWS

In [7,8] the grammatical complexity of the Feigenbaurn attractor and the general Feigenbaurn attractors, generated by period - n - tupling, are studied. In this paper we study the grammatical complexity of the Feigenbaurn type attractors, including Feigenbaurn attractors and general Feigenbaurn attractors,in periodic windows. It is shown that the languages determined by these attractors are CLS and are. not CFL.     

KNA算法计算单零点多项式全部零点的复杂性

证明用KNA算法计算n次单零点多项式全部零点所需的多项式计值次数不超过O(n~3 log_2(n/ε)),其中ε是计算精度。     

统计因素分析法刍议

本文主要就统计因素分析法中不变因素的固定时期问题．提出了“先变因素和后变因素”的观点，从而对统计指数理论难以解释的问题．变得较为容易处理。     

汕头市API指数年变化规律及控制对策

对汕头市全年空气主要污染物指数年变化规律进行统计、分析 ,结果显示 :其年变化规律受季节及气象要素影响 ,可吸入颗粒物浓度偏高的主要原因与人群活动有较密切关系 .并提出相应的控制对策 :加强对机动车尾气的控制、工业污染源管理和做好垃圾有效处理、主干道定期洒水降尘及绿化固土等工作     

结构在地震作用下的损伤评估方法

建筑结构应该能够承受一定地震运动的作用，同时也应该允许其产生一定的损伤。对于结构在地震作用下的损伤评估有多种的方法。本文将分别对从累积损伤方面、变形方面、变形和累积损伤的总和方面、刚度退化方面得到的损伤模型的特点进行评述。