High resolution stalagmite δ18O records over the past 1000 years from Dongge Cave in Guizhou

Based on MC-ICP-MS U-series dating andstable O-isotope analysis results, a 4-5 years resolution monsoon record over the past 1000 years has been established for two stalagmites from Dongge Cave, Guizhou. The high resolution oxygen isotope record serves as a proxy for variations in rainfall of Asian southwest monsoon over the Yunnan-Guizhou Plateau. A close relation of the δ18O record with the A^14C record from tree rings largely reflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuous decrease in the δ18O value at AD 1720 indicates an abrupt increase in monsoon rainfall, suggesting that an atmospheric-oceanic couple over the tropical Indian Ocean plays an important role in rapid increase of the Northern Hemisphere temperature over the last century.     

非对称平曲线

利用平曲线的基本公式,推导非对称平曲线的计算公式,从而给同步测设带来方便。     

Criterions and Measures of Route Selection of Shallowly Embedded Long.Distance Oil and Gas Pipeline in Mountain Areas

According to the engineering investigation of long-distance oil and gas pipelines, the criterions and measures of route selection are drawn as follows： the flat landform is the first choice in route alignment. The foot of mountain is the first choice when the route passes by the valley. The route should pass by but the shady and deposited slope and not in sunny and erosive slope as possible as it can. The pipeline should be vertical to contour climbing and descending the mountain except steep slope. Tunnel can be used in crossing foothill. Perpendicularly traversing the river is better than beveling; the worst choice is to put the pipeline along the river. Bypass is the best choice in karsts area. The order of route selection should be pre-choosing, investigation, optimization and adjustment.     

Deformation and Development Tendency of Shiliushubao Landslide by Numerical Modeling

On the basis of analysing basic features of Shiliushubao landslide, the landslide＇s deformation and development tendency are quantitatively studied by using FLA^3D program. The results accord with monitoring results. The results are indicated that resevoir impounding accelerates the landslide＇s deformation, and the variation of reservoir water level is key factor of affecting the deformation; The landslide has the characters of pull-behind move ment according to the displacement of the landslide body gradually reducing from leading edge to trailing edge; Excavating and deloading slow down the landslide＇s deformation in the certain degree. On the basis, the deformation developmental tendency of Shiliushubao landslide is predicted by the established simulating model.     

基于字符图像质量评价的打印机取证

为了认定打印文件的来源，提出一种基于字符图像质量评价的打印机取证方法，在分析字符打印区域“条带”噪声的基础上，通过高斯滤波对字符图像提取噪声，并借助图像质量评价方法提取噪声图像的统计特征，来描述每台打印机的个体特征，并采用支持向量机作为分类器，对比目前国外已有文献的方法，所提出的方法不仅10台打印机都判决正确，而且字符分类正确率有很大提高，字符图像质量特征抓住了打印机的个体特性，使取证结果有效且具有说服力。     

汽车主动悬架的约束预测控制

约束预测控制的最大优点之一是能优化被控系统的性能指标，并显式地处理被控系统的约束条件，使之动态满足。以某二自由度四分之一车为例，讨论了汽车主动悬架的约束预测控制(CMPC)问题：依次给出了状态反馈方法和输出反馈方法，并基于预测控制的滚动实施策略，提出了一种自适应约束预测控制方法。仿真结果表明，CMPC主动悬架能在确保操纵稳定性和保持较小作动力的情况下，满足悬架系统的输出约束，同时控制输出得以优化，明显提高了悬架系统的乘坐舒适性。     

基于协同服务平台的分布式产品数据管理

为了实现异地设计制造环境下多产品数据管理(PDM)系统之间的数据交换、共享及其过程协同 ,在分析分布式产品数据管理特性的基础上 ,构建了一个基于协同服务平台的分布式、开放式产品数据集成管理框架结构 ,介绍了协同服务平台的功能 ,提出了多 PDM系统间的数据通信方法、安全保证机制和一致性控制策略 ,并应用于某航空产品的异地协同设计中 ,满足了协作企业对产品数据的共享要求 ,保证了数据的一致性和完整性     

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