防止生物污染：使用单次系统保证生物生产环境的安全、洁净和有效

目前，生物工艺生产中最热门的趋势之一就是使用单次系统。这些一次性系统可以替代许多类型的昂贵的不锈钢生物工艺设备，如带有滤膜、滤袋和管件的过滤器、贮槽和传输管线等等。与不锈钢设备相比，单次系统安装使用简洁迅速、不需要繁杂的设备验证，还可以节省成本。最终，还可以较好地对生物污染进行控制，从而提高了产品的总收率。[编者按]     

ArcFVS:An integration of a Geographic Information System and Forest Vegetation Simulator

This paper presents the design and implementation of an integrated application program called ArcFVS that links the Forest Vegetation Simulator (FVS) and a Geographic Information System (GIS) to realize spatial selection of input files and graphic display of modeling output. Data for testing and running the model came from the U.S. Forest Service's Forest Inventory and Analysis (FIA) Database and were also collected in field surveys in north-central Indiana. ArcFVS 1.0 is designed using the ArcGIS software from the Environmental Systems Research Institute (ESRI) and the Visual Basic for Applications (VBA) programming environment to manipulate ESRI's ArcObjects. The resulting product offers custom functions as commands in a new menu or as tools on a new toolbar. They are used to: select spatially or by attribute the forest plots to be projected by FVS, create the FVS input files for the selected plots and display in a geospatial environment different types of FVS output (text output files, tables with variables of interest and visualization image files). Advantages of ArcFVS 1.0 include the new GIS capabilities, enhanced format translation functions and the standardized programming environment.     

柬埔寨矿业

柬埔寨位于东南亚地区,是一个国土面积仅有181,000平方公里的小国。2005年,柬埔寨总人口数为13,600,000,是亚太地区最贫穷落后的地区之一。柬埔寨的绝大部分矿业资源未经开采,已知的矿产资源有炭酸盐类矿石,锰,磷酸盐类矿石,红宝石,盐矿,锆石等。另外,还有近海的石油及天然气等。该国地质环境得天独厚,很可能拥有铝土矿,煤,铜,黄金,大理石,铁矿石,瓷土,铅,石灰岩,泥炭沙,砾石,蓝宝石,硅沙,板岩,锡,锌等矿产。为了吸引更多的国内外矿业公司对矿业开发投资,柬埔寨政府于2001年颁布了矿业管理与开采法令,国家工业部,矿产部及能源部主管该法令及…     

近红外技术监测流化喷雾制粒水份的研究

流化床喷雾制粒是一种较复杂的生产过程，实现生产过程中物料含水量实时监测，对提高产品质量、实现生产装置自动化意义重大。本文探索利用近红外测试分析技术．实现对流化床喷雾制粒生产过程颗粒含水量的实时监测。根据现代NIR理论和不同含水率颗粒光谱特点，采用双光路4波段8光束反射式近红外测试装置，进行含水率测试实验，实现了颗粒含水量在线监测，实验表明本文方法具有较高的测量精度和抗干扰性，为实现产品颗粒含水量自动测控提供了一种新的方法。     

Experimental and numerical study of the fragmentation of expanding warhead casings by using different numerical codes and solution techniques

There has been increasing interest in numerical simulations of fragmentation of expanding warheads in 3D. Accordingly there is a pressure on developers of leading commercial codes, such as LS-DYNA, AUTODYN and IMPETUS Afea, to implement the reliable fracture models and the efficient solution techniques. The applicability of the Johnson-Cook strength and fracture model is evaluated by comparing the fracture behaviour of an expanding steel casing of a warhead with experiments. The numerical codes and different numerical solution techniques, such as Eulerian, Lagrangian, Smooth particle hydrodynamics （SPH）, and the corpuscular models recently implemented in IMPETUS Afea are compared. For the same solution techniques and material models we find that the codes give similar results. The SPH technique and the corpuscular technique are superior to the Eulerian technique and the Lagrangian technique （with erosion） when it is applied to materials that have fluid like behaviour such as the explosive and the tracer. The Eulerian technique gives much larger calculation time and both the Lagrangian and Eulerian techniques seem to give less agreement with our measurements. To more correctly simulate the fracture behaviours of the expanding steel casing, we applied that ductility decreases with strain rate. The phenomena may be explained by the realization of adiabatic shear bands. An implemented node splitting algorithm in IMPETUS Afea seems very promising.     

蒙德里安的窗户

<正>本案位于美国旧金山,其原本的格局是一间单人房的寓所,近日由Form4 Architecture的首席设计师John Marx完成了该房子的重新改造和扩建。它的主要设计灵感来自于荷兰画家、风格派运动幕后艺术家Piet Mondrian(彼埃·蒙德里安)的格子画作品,该元素被运用在了本案的各种细节之中。     

在繁忙交通道路上进行的透水路面足尺寸工程试验

本文介绍了一项足尺寸工程试验案例.为评估不同类型基础层的路面性能,本项试验在宽度4m、长度6m、承受重型货车(HGVs)的路面上,对四种类型基础层进行试验.每种类型路面都含有蓄水功能的透水基础层,雨水可以被滞留在路基层内.目的是比较四种类型基础层的透水路面在交通状况下的性能.     

Magneto-polaron induced intersubband optical transition in a wide band gap Ⅱ–Ⅵ semiconductor quantum dot

Effects of LO-phonon contribution on the electronic and the optical properties are investigated in a Cd0:8Zn0:2Se/ZnSe quantum dot in the presence of magnetic field strength. The magneto-polaron induced hydrogenic binding energy as a function of dot radius in the wide band gap quantum dot is calculated. The oscillator strength and the spontaneous lifetime are studied taking into account the spatial confinement, magnetic field strength and the phonon contribution. Numerical calculations are carried out using variational formulism within the single band effective mass approximation. The optical properties are computed with the compact density matrix method. The magneto-polaron induced optical gain as a function of photon energy is observed. The results show that the optical telecommunication wavelength in the fiber optic communications can be achieved using CdSe/ZnSe semiconductors and it can be tuned with the proper applications of external perturbations.     

基于SR7265硬件的虚拟锁相放大器、频谱仪、阻抗计和半导体参数分析仪

锁相放大器是用来测量微弱信号的专用仪器.即使噪音上千倍于被测信号,通过锁相放大器,也能得到精确结果.随着数字信号处理技术在仪器中的应用,可编程仪器变得越来越灵活.结合虚拟仪器的技术,论文通过对SR7265的硬件重新编程,在同一个硬件上实现了虚拟锁相放大器、虚拟频谱仪、虚拟阻抗计和虚拟半导体参数分析仪等等功能.本虚拟仪器采用了4层的逻辑结构.同样的功能也在一个FPGA板上成功地部署.     

外接电源能量效率新标准

外接电源(EPS),即那些给各类电子产品--从无绳电话到笔记本电脑--供电的充电器和适配器,近来已经成为新的能量效率标准(见表1)所针对的目标.EPS全球每年的销售量达10亿只以上,而且目前约有100亿只在使用,已经成为最大的一个电源门类.目前正在使用的EPS中,有大约一半属于效率低下的、采用工频变压器和线性稳压器的类型.除了效率低至25～50%,这些装置无负载时的功耗一般为1W或1W以上.每年被低效率的EPS浪费的能量总量--单就美国而言-估计达300亿到600亿千瓦时,即每年的开销达25亿到50亿美元.这一消耗占到美国国内全部发电量的1～2%,等于大约26座平均规模的电站的输出总和.