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.     

储罐用07MnNiVR钢焊接接头力学性能试验

为了将07MnNiVR钢板用于建造大型储罐,根据确定的焊接工艺和焊接工艺参数,研究了焊接接头的拉伸性能、系列冲击性能、无塑性转变温度和断裂韧度等,各项力学性能表明,焊接接头可满足大型储罐的设计要求并且保证其安全运行。     

压力容器用07MnNiMoDR钢板的低温冲击韧性研究

利用金相显微镜和扫描电镜分析了07MnNiMoDR钢板的基体组织和冲击断口形貌,研究了影响钢板板厚1/2位置冲击韧性的根本原因。板厚1/2位置的变形不足导致心部组织粗大,同时有大颗粒碳化物伴生于粗晶粒的晶界,碳化物的存在是影响冲击韧性的根本原因。通过优化轧制和热处理工艺,钢板冲击功值稳定在240 J以上。     

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。     

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。