全负压烟囱选型浅析

对全程全负压烟囱造型的理论依据及造型原则作了详细的介绍，并从经济技术角度作了分析，指出了全程全负压烟囱随着火电厂单机容量的增大和环境保护日趋严格的要求，必将在我国大力推广应用。     

2005年中国风电产业回顾和未来5年的展望

在对2005年风电装机容量进行准确统计的基础上,分析了风电场建设快速增长但国产设备制造能力仍然薄弱的态势。回顾2005年内发生的对风电具有里程碑意义的事件及对发展趋势的影响。指出“十五规划”期间风电的进展和教训,强调未来5a应以国产化能力和风电上网电量衡量业绩。     

Striping and Scheduling for Large Scale Multimedia Servers

When designing a multimedia server, several things must be decided: which scheduling scheme to adopt, how to allocate multimedia objects on storage devices, and the round length with which the streams will be serviced. Several problems in the designing of large-scale multimedia servers are addressed, with the following contributions: (1) a striping scheme is proposed that minimizes the number of seeks and hence maximizes the performance; (2) a simple and efficient mechanism is presented to find the optimal striping unit size as well as the optimal round length, which exploits both the characteristics of VBR streams and the situation of resources in the system; and (3) the characteristics and resource requirements of several scheduling schemes are investigated in order to obtain a clear indication as to which scheme shows the best performance in realtime multimedia servicing. Based on our analysis and experimental results, the CSCAN scheme outperforms the other schemes. It is believed that the results ar     

降低极薄金矿脉开采成本新途径的研究

傲汉旗撰山子金矿用人工底柱代替矿石顶底柱，铁溜井代替木溜井、《金属量》承包代替作业进尺的方法，减小了极薄金矿脉开采的损失率与贫化率，为同类矿山降低开采成本开创了一条新途径。     

An Entrapment Model of Water Flow on Fine Coal Flotation

Effect of entrapment of water flow on fine coal flotation was studied. The relation between constant of water flotation rate and flotation time was investigated and the water recycling model determined. The entrapment model of water flow about the relation between the recovery of fine particle and that of water in concentration was established. Finally, the equation about ash in fine clean coal at any time was derived by introducing a de-ashing coefficient.     

An Accelerated Iterative Method for Simultaneously Determining All Roots of Polynomial Equation

In this paper, an accelerated iteration method for simultaneously determining of a polynomial equation's roots is proposed. The new method is an improvement of modified Newton method. At the same time, convergence properties and the order of convergence rate are discussed. At last, some numerical results are reported and listed.     

会展建筑中的大空间排烟系统分析

通过对会展建筑中的大空间展厅的火灾情形、排烟量及排烟方式的分析,得出了一个适合此类建筑的排烟系统设计的经济合理的参考方案.     

Compomer的摩擦磨损特性

采用Compoglass，F2000，Elan，Dyract AP4种牙科用复合体材料(Compomer)，对其玻璃颗粒含量和表面硬度进行了测量，并在球一盘往复摩擦磨损试验机上考察了它们的摩擦磨损特性。结果表明：F2000的摩擦系数最高，Elan的摩擦系数次之，Compoglass和DyractAP的摩擦系数分别为第三和第四．摩擦系数随玻璃颗粒含量的增加而增加．在同样试验条件下，低摩擦系数的DyractAP和Compoglass与高摩擦系数的F2000和Elan相比具有较好的耐磨性．磨损机理主要表现为由玻璃颗粒脆性断裂引起的玻璃颗粒脱落和磨粒磨损。     

Generalized Deformation Curve for High-Strength Steel over a Wide Range of Strain Rates

Test results for different high-strength steel specimens in static and impact tension and compression over a wide range of strain rates were summarized. These data were used to calculate the generalized deformation curve. The calculations based on this curve were compared with the experimental data on impact indentation with the conical indenter to evaluate the applicability of this method for studying the behavior of metals at high strain rates.     

Identification and Validation of a Discrete Element Model for Concrete

The use of a three-dimensional discrete element method (DEM) is proposed to study concrete structures submitted to dynamic loading. The aim of this paper is to validate the model first in the quasistatic domain, and second in dynamic compression, at the sample scale. A particular growing technique is used to set a densely packed assembly of arbitrarily sized spherical particles interacting together, representing concrete. An important difference from classical DEMs where only contact interactions are considered, is the use of an interaction range. First, the correct identification of parameters of the DEM model to simulate elastic and nonlinear deformation including damage and rupture is made through quasistatic uniaxial compression and tension tests. The influence of the packing is shown. The model produces a quantitative match of strength and deformation characteristics of concrete in terms of Young’s modulus, Poisson’s coefficient, and compressive and tensile strengths. Then, its validity is extended through dynamic tests. The simulations exhibit complex macroscopic behaviors of concrete, such as strain softening, fractures that arise from extensive microcracking throughout the assembly, and strain rate dependency.