高性能计算资源管理平台设计

地震资料处理是典型的高性能计算,随着采集数据量越来越大,对计算机资源的快速调度和配置提出了要求。为达到高效管理的目的,需要从技术选择、生产实际情况、业务特点等方面综合考虑,建立智能化的资源管理调度平台,使资源的提供与回收等管理具备云计算特征。     

Instrumentation-Driven Validation of Dataflow Applications

Dataflow modeling offers a myriad of tools for designing and optimizing signal processing systems. A designer is able to take advantage of dataflow properties to effectively tune the system in connection with functionality and different performance metrics. However, a disparity in the specification of dataflow properties and the final implementation can lead to incorrect behavior that is difficult to detect. This motivates the problem of ensuring consistency between dataflow properties that are declared or otherwise assumed as part of dataflow-based application models, and the dataflow behavior that is exhibited by implementations that are derived from the models. In this paper, we address this problem by introducing a novel dataflow validation framework (DVF) that is able to identify disparities between an application’s formal dataflow representation and its implementation. DVF works by instrumenting the implementation of an application and monitoring the instrumentation data as the application executes. This monitoring process is streamlined so that DVF achieves validation without major overhead. We demonstrate the utility of our DVF through design and implementation case studies involving an automatic speech recognition application, a JPEG encoder, and an acoustic tracking application.     

Elevated temperature nanoindentation and viscoelastic behaviour of thin poly(ethylene terephthalate) films

A commercial nanoindentation system fitted with a heating stage and heated indenter has been used to investigate how the elevated temperature nanoscale mechanical properties of poly(ethylene terephthalate) films vary with their processing history and crystallinity over the temperature range 60-110 degrees C. Three additive-free thin films were tested; an undrawn amorphous film, a uniaxially drawn film, and a commercial biaxially drawn Melinex film. A sharp decrease in mechanical properties was observed between 70 and 80 degrees C on the undrawn and uniaxial film consistent with the presence of a glass transition over this temperature range in agreement with literature values for bulk materials. In contrast, a gradual decrease in properties was observed over the same temperature range on the biaxially oriented film. The high crystallinity of the biaxial film could be beneficial in extending the operating temperature of the film. There is a minimum in the elastic recovery parameter around 80 degrees C on both the amorphous and biaxial film. This indicates that the elastic recovery parameter may be more sensitive to changes in mechanical properties occurring at/near the glass transition region than the hardness or modulus alone. A recently introduced dimensionless parameter for creep, A/d(0), was also found to be a promising way to characterise the increased time-dependent deformation around the glass transition region.     

1#炉给粉系统的变频控制设计

本文详细介绍了通用变频器在电厂给粉控制系统中的应用,并采用相关变送器及智能调节器构成闭环控制系统,此系统的构成可大大提高给粉的经济和技术指标,其综合效益十分明显。     

用户电路板中的抗干扰问题分析

用户电路板具有数字／模拟信号混合,电源种类多,地线种类多,元器件多密度大等特点,因而会带来一 系列干扰问题,正确合理的布局布线,对抑制其干扰起着重要作用。本文通过几个典型实例,分析其干扰现象和干扰原因,并给出了抑制其干扰的有效措施。最后提出了用户电路板中印制板电源,地线布线设计时应注意的问题。     

Heavy metal removal by microalgae

The liver is one of the principal sites of iron overload in diseases such as hemochromatosis and beta thalassemia. Hence, much effort has been invested in examining the mechanisms of Fe uptake by hepatocytes. In the present study we have examined the effect of small molecular weight (M(r)) Fe complexes on Fe uptake from iron 59-labeled transferrin (Tf) and 59Fe-labeled citrate by primary cultures of hepatocytes. This was important to assess because Fe-citrate and saturated diferric Tf coexist in the serum of patients with untreated Fe overload. Preincubation of hepatocytes with the low-M(r) Fe complex ferric ammonium citrate (FAC; 25 microg/mL; (Fe) = 4.4 microg/mL) followed by incubation with 59Fe-Tf or 59Fe-citrate ((Fe) = 0.25 to 25 micromol/L) resulted in the marked stimulation of 59Fe uptake. For example, at a physiologically relevant Tf-Fe concentration of 25 micromol/L, there was an 8-fold increase in 59Fe uptake by cells incubated with FAC compared to control cells. In contrast, at Tf-Fe concentrations of 0.25 to 2.5 micromol/L, 59Fe uptake in FAC-treated cells was only 1-fold to 3-fold greater than that in the corresponding controls. These data suggest that the FAC-activated Fe uptake process predominates at physiologically relevant Tf concentrations above the saturation of the Tf receptor (TfR). This is the first study to demonstrate that preincubation of hepatocytes with Iow-M(r)Fe complexes can markedly increase Fe uptake from diferric Tf. In conclusion, these results may help to explain the loading of hepatocytes with Fe that occurs in Fe-overload disease despite marked down-regulation of the TfR.     

基准相态为气相的液态烃物理计算

指出了在石化企业中掌握在不同状态下轻烃类物理焓、熵及　计算方法的重要意义。从５个方面重点对基准相态为气相的液态烃焓、熵及的计算方法进行了详细的分析探讨：（１）在气相轻烃单体从基准状态被等温压缩至其饱和蒸气压而开始液化前的焓、熵及;（２）在可逆相变过程中的焓为该物质的蒸发潜热,在该相变过程中的焓、熵及;（３）把液相变压过程中的液相性质看成与压力无关;（４）在液相变温过程中轻烃单体的焓、熵及;（５）轻烃类混合物的焓、熵及。最后,以炼油过程中轻烃单体及其混合物物理　的计算作为实例来说明这些计算策略的应用。     

采用双(多)壳程换热器来促进换热网络的进一步优化

文中从过程工业换热流程优化的角度论述了采用双（多）壳程换热器的重要性和必要性,并从单个匹配和整个换热网络两方面进行了理论分析,指出采用双（多）壳程换热器具有降低换热器投资,提高换热网络热回收率和过程系统的能量综合优化化水平等多重效果。