一类广义树的色性

本文证明了图G是树序列为{1，p，1，q-4个…1，2，2，r}的广义树的充要条件是G的色多项式为P(G；λ)=λ(λ-1)^p(λ-2)…(λ-q 2)^2(λ-q 1)^2(λ-q)^r，这里q=4.5。     

多维自回归滑动平均模型研究与应用

利用时序分析方法研究1952－1997年国内生产第一产业与第二产业产值的ARMAV模型，并用所建模型对1998年产值进行外延预测，得到较理想的预测结果。     

电路节点的数据结构及电路方程的数据结构

简要介绍了一般电路的数据结构brlist和基尔夫回路集的数据结构kichhoff，提出了电阻、恒压源和恒流源等元件的数据结构和电路节点集的数据结构dotsque，给出了由电路brlist得出dotsque的算法，通过一个实例分析了实际电路、brlist、kicrhhoff和dotsque的关系，给出了KVL方程、KCL方程和电流电压方程的数据结构，最后从人工智能和机器学习的角度讨论了非线性复杂的计算机表示方法和计算机自动求解的问题。     

Formation of substitutional metallofullerenes by laser ablation of externally doped fullerenes C60M x (M=Sm, Pt, Ni and Rh)

Photofragmentation study of metal fullerides C₆₀M _x (M = Sm, Pt, Ni and Rh) by excimer laser ablation-TOF mass spectrometry shows that metallofullerenes C_2n M and C_2n+1M formed in both the positive and negative ionic modes. The isotopic distributions of the metallofullerenes C_2n M and C_2n+1M are consistent with the calculated spectra based on the natural abundance of isotopes of C and M, confirming the formation of metallofullerenes. The metal atom is supposed to be incorporated into the network of the fullerene cage to replace one carbon atom of the cage forming substitutional metallofullerene. Odd-numbered high carbon clusters are observed in our laser ablation study of all the metal fullerides in the negative ion channel. Evolution of mass spectrum with irradiation laser shots shows that the formation of the substitutionally doped fullerenes is closely related to the production of metal carbide (MC). The structures, as well as formation mechanism, of metallofullerenes C_2n+1M and C_2n M with even and odd numbers of total atoms respectively are discussed based on the structural optimization of the odd-numbered high carbon clusters.     

An Experimental Study of Aspect Ratio on the Tensile Properties of an Elastic Fabric for Making-up of Pressure Garments

The“cut-and-sewn” pressure garments are normally tailored made in various sizes according to the size of human body as well as the area of burn wounds.When a tubular pressure garment is cut in different length and width measurements,different aspect ratio will be occurred on the elastic fabric for making up the pressuregarment. Many therapists in Hong Kong concerned the change of aspect ratio may affect the tensile properties of the elastic fabric and ultimately will affect the skin-and-garment interface pressure for the patient.The aim of     

大型挖掘机下部结构整体参数的优化设计

对大型挖掘机下部结构提出了整体结构参数优化的方法和程序,建立了合理的优化模型,并以美国P＆H公司生产的2300xp挖掘机的原始参数为例,运用本方法进行整体优化,优化结果和P&H2300xp挖掘机下部结构尺寸极为接近。     

用白光快速烧结制作离子注入层欧姆接触

研究了用白光快速烧结法制作的n型高浓度离子注入层欧姆接触的特性.选用硅和硫离子,获10~(18)cm~(-3)以上的高浓度.白光快速烧结温度为400～460℃.实测的比接触电阻的最好值达到10~(-6)·Ω·cm~2.该法已用于全离子注入平面型场效应晶体管和GaAs/GaAlAs异质结HOT晶体管,性能良好.     

ZQ—1型自放式防火卷帘门启闭机的研制

介绍2K—H型少齿差行星传动在ZQ—1型自放式防火卷帘门启闭机中的应用,阐述了工作机理、设计计算及强度校核等。传动部分采用了固体润滑。     

~(14)C草甘膦在大蓟、小蓟植株中吸收输导作用的研究

用~(14)C草甘膦处理大蓟和小蓟的叶子试验证明,这两种杂草吸收草甘膦后具有双向输导性能。其吸收速度和植株各部分的药量分布是不同的,施药一天后总吸收量较少,占总药量的4.05％,但三天后明显增加,到第六天达到44.54％。而叶子的吸收高峰是处理后3～7天。根部的吸收量,从处理后一天的14.42％,到第六天增加到93.8％。但是,处理七天后,仍有50％左右的药剂未被植株所吸收。所以,草甘膦施药期不宜太迟,同时,施药方法要保证有足够的药量覆盖杂草茎叶上并被吸收。     

连续速度场解析平面变形正反向挤压

对平面变形的正反向挤压问题建立运动许可的连续速度场并获得上界解析解。该解与以三角形速度场得到的上界解和 Avitzur 以柱坐标系连续速度场得到的上界解进行比较表明,本文解法有时可得到更低的上界值,且可得到通解。