HfO2:Eu nanoparticles excited by X-rays and UV-visible radiation used in biological imaging

Europium doped hafnium dioxide nanoparticles were crystallized using biologically friendly microwave hydrothermal method and employed in observation of small rodents tissues.Main solvent in synthesis is water,in consequence nanoparticles are found surrounded by thin hydroxide layer.Size of the nanoparticles is controlled by temperature of calcination.1200℃heating causes drop of luminescence intensity,explained as damage of high symmetry surface emission centers in the nanocrystals.On the other hand,growth of crystallites increases intensity of X-ray and electron beam excited luminescence.This makes them promising activator in photodynamic therapy.     

Engineering Ecologies

Engineering disciplines have, historically, been strongly dominated by physics. Structural and civil engineering are still based on the notion of controlling the forces of physics within our material world. However, a shift from physics to biology as the underlying paradigm of engineering is on the horizon, and with it a fundamental change in the way we conceive and practise architecture. Peter Trummer speculates on the possibilities and potential repercussions of ‘engineering ecologies’, which will be inherent to such a paradigm shift, by investigating a broad palette of contemporary design disciplines aimed at the careful modulation of environments and ecologies. Copyright © 2008 John Wiley & Sons, Ltd.     

新型捕收剂CL-07+CJ常温浮选某中低品位磷矿石

滇池周边拥有巨量的中低品位磷矿资源,为了高效开发这些资源,并解决磷矿石浮选常规捕收剂常温下分散性和溶解性差的问题,用昆明冶金研究院研制的新型常温捕收剂CL-07+CJ,对滇池附近某磷矿石进行了选矿试验。结果表明,该矿石在磨矿细度为-200目占60.4%,浮选温度为15 ℃,脉石矿物抑制剂Na2SiO3粗选用量为2.0 kg/t,矿浆pH调整剂NaOH粗选用量为0.8 kg/t,磷矿物捕收剂CL-07+CJ粗选用量为0.4+0.14 kg/t情况下,采用1粗2精1扫、中矿顺序返回流程浮选,可获得P2O5品位为34.60%、P2O5回收率为94.10%的磷精矿。     

MPC07控制卡在运动控制系统中的应用

给出了采用基于PCI总线MPC07控制卡作为运动控制系统的开发平台．并利用VC＋＋对MPC07运动控制函数库进行二次开发而编写出的面向对象的实时显示控制程序;同时给出了通过MPC07卡对运动控制系统中小车进行精确运动控制的具体方法。文中详细介绍了MPC07的工作原理、技术指标及接口特性。     

Migration Pattern Process

Within the international community architects are regularly typecast as exporters of predetermined solutions, rarely given the opportunity to respond appropriately, sensitively and effectively to specific and real emergencies. At the core of any impact are people like you and I; their welfare and successful healing creates a catalyst for the community to rebuild lives and esteem. Since 2007, Diploma Unit 7 at the Architectural Association in London, led by Simon Beames and Kenneth Fraser , has been researching the philosophical, social, political, economic and technical response to long-term humanitarian relief and the resocialisation of displaced people and damaged communities in conditions of extreme hardship. Copyright © 2009 John Wiley & Sons, Ltd.     

07MnNiCrMoVDR钢焊缝组织与低温冲击韧性分析

采用SMAW焊接工艺焊接低合金高强度07MnNiCrMoVDR钢获得焊接接头,通过焊缝显微组织观察、冲击断口分析、焊缝低温冲击试验,研究了07MnNiCrMoVDR钢焊缝组织与低温冲击韧性。结果表明,焊缝组织由沿晶界分布的先共析铁素体、晶内的针状铁素体和粒状贝氏体构成,针状铁素体以微夹杂物为核心生长。温度为－40 ℃时,不同部位焊缝冲击吸收功随试样截取深度的增大而减小;与近表面处相比,1/2厚度处焊缝冲击吸收功损失约67%,在1/4厚度处,焊缝冲击吸收功随着温度的降低而降低;焊缝的低温冲击韧性符合要求。焊缝冲击断口的表面由凹凸不平变得比较平整,断口的微观形貌由韧窝花样变成解理河流花样。     

耐湿硫化氢腐蚀的新材料07/09Cr2AlMoRE

介绍了耐湿硫化氢腐蚀用 0 9Cr2AlMoRE钢无缝管和 0 7Cr2AlMoRE钢板材的化学成分、力学性能、耐腐蚀机理以及焊接材料研制的试验数据。分析了稀土在钢中微观行为的作用。试验与应用结果显示 ,0 7/ 0 9Cr2AlMoRE钢具有良好的耐应力腐蚀和耐均匀腐蚀性能 ,以及较强的耐湿H2 S腐蚀能力 ,因此 ,特别适用于在H2 S腐蚀环境中工作的部分炼油设备及油田集输设备     

The Bézier Tangential Surface System: a Robust Dual Representation of Tangent Space

This paper develops a robust dual representation for the tangent space of a rational surface. This dual representation of tangent space is a very useful tool for visibility analysis. Visibility constructs that are directly derivable from the dual representation of this paper include silhouettes, bitangent developables and kernels. It is known that the tangent space of a surface can be represented by a surface in dual space, which we call a tangential surface. Unfortunately, a tangential surface is usually infinite. Therefore, for robust computation, the points at infinity must be clipped from a tangential surface. This clipping requires two complementary refinements, the first to allow clipping and the second to do the clipping. First, three cooperating tangential surfaces are used to model the entire tangent space robustly, each defined within a box. Second, the points at infinity on each tangential surface are clipped away while preserving everything that lies within the box. This clipping only involves subdivision along isoparametric curves, a considerably simpler process than exact trimming to the box. The isoparametric values for this clipping are computed as local extrema from an analysis using Sederbergs piecewise algebraic curves. A construction of the tangential surface of a parametric surface is outlined, and it is shown how the tangential surface of a Bézier surface can be expressed as a rational Bézier surface.