Design considerations for array processing languages

The Department of Energy (DoE) has a long history of large-scale scientific calculation on the most advanced ‘number-crunching’ computers. Recently, an effort to improve communications and software sharing among DoE laboratories has been underway. One result of this sharing is a project to design and implement a common language. That language turns out to be FORTRAN 77 significantly extended with new data structures, control structures and array processing. The data used to design the array processing feature is surprising and likely to be of use to others working in scientific language design; it is reported here so that others may profit from DoE's experience.     

油罐液位信息采集系统的设计

介绍了以单片机W77E58为核心的油罐液位信息采集系统.该系统采用磁致伸缩液位计,精确度高,能自动采集信息并进行处理.介绍了系统的工作原理、组成及功能,并给出了原理图及部分程序代码.     

XCfde：高压缩率的XML文档压缩技术

本文提出了一种用于数据交换的XML压缩技术XCfde。XCfde采取四步压缩方案：把XML文档分离为结构数据和内容数据;自动识别数据类型并自动分类数据;对不同类型的数据采用不同的编码策略;将初步编码后的结构数据和内容数据使用7Zip进行整体压缩。XCfde拥有较高的压缩率,改善了XML数据交换的传输效率和存档中的空间利用率。     

Preliminary results on TeV sources search with AGILE

During its first 2 years of operation, the gamma-ray AGILE satellite almost completed a full study of the gamma-ray sky. This paper presents the preliminary results of the systematic study performed on the AGILE data to search for GeV counterparts and to derive flux upper limits of the TeV sources detected by various instruments (MAGIC, HESS, VERITAS, Cangaroo, MILAGRO, ARGO,….).     

空间仪器锂离子蓄电池管理控制器研究

为了满足实验类空间仪器对空间电源系统的低成本、高集成度、微型化的需求,设计了以C8051F040芯片为控制核心的空间仪器电源控制器。该控制器与传统设计方式的最大区别是采用高集成度的锂离子电池控制芯片(bq77PL900)代替了原有的模拟电路。通过使用该芯片不仅大大降低了控制器所占体积,减小了控制器的功耗,而且提高了控制器的抗干扰能力。为了提高系统的可靠性,该系统还采用在线EEPROM充注技术,可以及时发现控制器内部被打翻的数据并进行恢复。通过实验证明该设计简单可靠,而且能量转换效率也提高了5%左右。该设计可广泛应用于低成本的空间仪器的电源、微小型卫星的电源系统。     

不同甩速制备的Fe_(77)Ga_(23)甩带合金的磁致伸缩性能和显微组织(英文)

采用7、12.5和25 m/s的甩速制备Fe77Ga23甩带合金(分别命名为样品S7,S12.5和S25)。高分辨X射线衍射谱表明:样品的主体相均为A2相,在样品S12.5和S25中观测到了修正DO3相,同时发现样品S25具有较强的(100)织构。Ga的K边扩展边X射线吸收精细结构谱表明:随着甩速的增大,Ga的次近邻Ga原子个数减少并伴随着次近邻Ga—Ga键长收缩。在所有样品中均未发现Ga原子团簇。研究表明:样品S7中短程有序的富Ga相和大的局域应变对样品S7的磁致伸缩性能并无明显影响,(100)织构和修正DO3相共同促进了Fe77Ga23甩带合金的磁致伸缩性能。     

An autonomous fuel cell: Methanol and dimethyl ether steam reforming direct fed to fuel cell

Studies of reforming systems integrated with Fuel Cells are interesting for energy production in remote regions, especially to develop multi-fuel processors, which can be fed by more than one fuel with no need to modify the unit. In this work, an Autonomous Fuel Cell (AFC) system with methanol and/or Dimethyl Ether Steam Reforming (SR) was modeled and simulated in Aspen Plus, evaluating process variables, appropriate operational conditions, and the need for additional processes. The maximum hydrogen formed is H₂/C = 3.0 (yield of 99.9%) and occurs generally with S/C ≥ 2 for several temperatures. The presence of a WGS reactor and a membrane for hydrogen purification was identified as vital to develop an AFC. In six situations that were studied with different operating conditions that meet the AFC operation, it was observed that the lowest temperature is preferable since it will consume the least amount of utility to maintain the SR.