A new formulated method of a quasi-compatible finite-element and its application in fracture-mechanics

Based on the local properties of a singular field, the displacement pattern of an isoparametric element is improved and a new formulated method of a quasi-compatible finite element is proposed in this paper. This method can be used to solve various engineering problems containing singular distribution, especially, the singular field existing at the tip of cracks. The singular quasi-compatible element (SQCE) is constructed. The characteristics of the elements are analysed from various angles and many examples of calculations are performed. The results show that this method has many significant advantages, by which, the numerical analysis of brittle fracture problems can be solved.

Magnetic field configurations of radio jets in the double source of radio galaxy

As an improvement of resolution of observations, more and more radio galaxies with radiojets have been identified and many fine structures in the radio jets yielded. In the presentpaper, the two-dimensional magnetohydrodynamical theory is applied to the analysis of themagnetic field configurations in the radio jefs. Two-dimensional results not only are con-sistent theoretically, but also explain the fine structures of observations. One of the theo-retical models is discussed in detail, and is in good agreement as compared with the observedradio jets of NGC6251. The results of the present paper also show that the magneticfields in the radio jets are mainly longitudinal ones and associate with the double sources ofQSOs if the magnetic field of the central object is stronger; the fields in the radio jets aremainly transverse ones and associate with the double sources of radio galaxies if the fieldof the central object is weaker. The magnetic field has great influence on the morphol-ogy and dynamic process.

Imminent Geologic and Hydrologic Hazards on Fort Ord BLM Land

The Bureau of Land Management acquired 7,500 acres of land as part of the re-use of the decommissioned Fort Ord Army base. A variety of geologic hazards exist on the landscape including gully erosion, mass wasting, and decaying earthen dams. This short report highlights a few critical areas that deserve closer evaluation and remediation. Of particular concern are decaying earthen dams and mass wasting of tall stream banks that may impact BLM infrastructure or adjacent urban development. (Document contains 13 paGES)

De L'abus des nuditez de gorge

Tratando-se de obra anônima, De l'abus des nuditez gorge - diz o aviso "do impressor ao leitor" - foi ditada pelo zelo e piedade de um fidalgo francês que, passando por Flandres e vendo a maioria das mulheres se apresentarem com o colo e os ombros nus e assim se aproximarem do confessionário e até da mesa da comunhão, afirmou que se escandalizara bastante com este costume e prometeu enviar àquele país uma mensagem para mostrar o abuso e o desregramento de tal atitude. Assim, é atribuída a dois autores: Jacques Boileau (1635-1716) e Foulques de Neuilly (m. 1201). Foi catalogada pela Livrary of Congress sob o nome do primeiro, mas como assinala Barbier, é mais provável que tenha sido escrita por Foluques de Neuily, pároco de Beavais. Jacques Boileau foi um erudito francês, doutorado pela Sorbonne e autor de numerosas pequenas obras, todas em latim e sobre questões curiosas de teologia. Suas obras são, na maior parte, anônimas ou pseudônimas.

Surface planar ion chip for linear radio-frequency Paul traps

We propose a surface planar ion chip which forms a linear radio frequency Paul ion trap. The electrodes reside in the two planes of a chip, and the trap axis is located above the chip surface. Its electric field and potential distribution are similar to the standard linear radio frequency Paul ion trap. This ion trap geometry may be greatly meaningful for quantum information processing.

机载测深激光雷达千赫兹全固态激光器设计及特性研究

将千赫兹高功率全固态Nd：YAG激光器的增益介质当作厚透镜处理，使用矩阵的方法对等效热透镜腔进行分析。采用多条半导体激光列阵侧向紧凑抽运结构设计，提高了增益介质光抽运的均匀性。根据实际抽运功率，通过模拟计算，设计了平凸非稳腔。选择的凸面全反镜的最佳曲率半径有效地补偿了增益介质热透镜效应，激光器实现了动态稳腔运转，激光脉冲能量输出斜度效率大于13％，光束发散角优于1.3mrad。

A new method of modeling cladding band structure of air-guiding photonic crystal fibers

Cladding band structure of air-guiding photonic crystal fibers with high air-filling fraction is calculated in terms of fiber shape variation. The fundamental photonic band gap dependence on structure parameters, air-filling fraction and spacing, is also investigated. The numerical results show that the band gap edges shift toward longer wavelength as the air-filling fraction is increased, whereas the relative band gap width increases linearly. For a fixed air-filling fraction, the band gap edges with respect to spacing keep constant. With this method, the simulation results agree well with the reported data. © 2007 Elsevier B.V. All rights reserved.

四类气候－植被关系模型的比较研究

本研究应用数字地球技术，基于1950年～1980年的全国958个气象站的基本气象数据（包括气象站的经纬度，海拔，月均温，月降水，年均温， 年降水，日照时数，日照百分率，风速等），比较了四个不同的根据水、热平衡原理设计的气候一植被关系模型(Penman模型、Holdridge生命地带系统、和Kira方法Thomthwaite模型)在中国应用的一致性和适用性。结果表明：(1) Penman模型在温带草原区和青藏高原地区的一致性指数超过50%，在青藏高原最出色，最有发展潜力。(2) Thornthwaite模型在热带雨林、季雨林区达到39. 72%，可以弥补Holdridg模型在热带地区分类精度的不足。(3) Holdridg生命地带系统在不同地带间适用性最广;只在热带地区，例如西部季雨林、雨林区域(52)、西部草原亚区域(63)和青藏高原温性荒漠地带(86)以及青藏高原温性草原地带(84)不理想。(4)吉良(Kira)方法在亚热带常绿阔叶林区可与Holdridg模型相媲美;在低海拔和湿润、半湿润地区效果尚可，但在温带荒漠区与青藏高原区的模拟效果与实际相差较远。 这四个传统的分类方法在中国植被区划一级分类上是适用的，Holdridge生命地带系统KAPPA -致性指数达到0.57模拟效果优于其它三者，但在特定地区，如青藏高原，所有模型均需改进优化或启用新的模型因子才能很好地区分植被亚地带。本研究还指出，数字地球技术的应用有助于推动气候一植被关系的研究，尤其在气候一植被指标（气候参数和模型参数）的大范围实时动态监测、气候一植被关系数据的海量信息高效、有序基础管理和功能型模型库支撑框架体系方面。

Numerical analysis of the current and voltage sharing issues for resistive fault current limiter using YBCO coated conductors

YBaCuO-coated conductors offer great potential in terms of performance and cost-saving for superconducting fault current limiter (SFCL). A resistive SFCL based on coated conductors can be made from several tapes connected in parallel or in series. Ideally, the current and voltage are shared uniformly by the tapes when quench occurs. However, due to the non-uniformity of property of the tapes and the relative positions of the tapes, the currents and the voltages of the tapes are different. In this paper, a numerical model is developed to investigate the current and voltage sharing problem for the resistive SFCL. This model is able to simulate the dynamic response of YBCO tapes in normal and quench conditions. Firstly, four tapes with different Jc 's and n values in E-J power law are connected in parallel to carry the fault current. The model demonstrates how the currents are distributed among the four tapes. These four tapes are then connected in series to withstand the line voltage. In this case, the model investigates the voltage sharing between the tapes. Several factors that would affect the process of quenches are discussed including the field dependency of Jc, the magnetic coupling between the tapes and the relative positions of the tapes. © 2010 IEEE.