铝电解槽烟气干法净化—新型气/固反应器的设计和运行特性

序言干法净化电解车间烟气用的氧化铝,吸附有烟气中的杂质。如很细的金属化合物粒子、二氧化硫和由阳极带入的碳素材料。当净化器捕集的氧化铝返回电解槽时,这些固体杂质也进入电解槽,其中有的成份能使铝的纯度降低。如果生产用的氧化铝百分之百用于净化,这些     

高性能分步重复对准系统的性能数据及混合匹配

本文简要地介绍了1980年问世的晶片分步重复对准系统,接着着重讨论了全晶片对准设备的混合匹配,详细论述了与混合匹配有关的问题(晶片预对准和曝光区的精对准)。给出了分辩率、套刻精度、生产率的基本性能数据,并报道了首次混合匹配的结果。     

用电流在金属零件上产生区域合金的方法

本发明的应用涉及到改善金属零件表面性能的方法和设备。在零件表面的限定区域上用电加热到它的熔点,同时添加其它材料到熔化的金属中,使零件的金属与添加材料形成合金。通常要求所选择的金属零件的基体具有一定的性能,如强度、成本、重量、弹性等,而在基体的某个区域上能提供不同的性     

钻进中钻头产生的钻杆波波型

钻进过程中,地面检波器可记录到两组由于钻头钻进中冲击地层而产生的波至。第一组波至是由体波组成,并幅射到地层中去。在以前的研究中已经证实了这些波至,见Rector和Marion,1991;Rector和Weiss,1989;和Rector和Hardage,1991的论著。第二组波至是“钻杆波至”,它们是由于钻头钻进中冲击地层所产生,并以张性波型式沿钻杆向上传播。由钻杆及其邻近的地层间的能量转换产生的地震波,传播到远离钻杆的地层中。这些波至在有关的钻头波场中。我们是可以识别的。     

井中管波衰减探头

最近,在英国石油(BP)勘探公司的迪瓦恩测试现场进行了一项野外实验,对一种井中管波衰减器作了鉴定。这种称做管波衰减探头的装置采用气囊衰减要通过其传播的井中管波。该探头机械结构简单,容易安装到常规导线测井电缆上;下井时,不需要与地面进行直接的电力连接或机械连接。野外测试结果表明,该衰减探头就其设计原理来看主要是一个管波反射器。在250到750Hz的带宽范围内,它能将大约85％的管波信号反射回去,只有15％仍沿原来的路径传播。测试还表明,该探头具有很大的工作深度范围,即能在流体静压力相当于预加压力的120％到360％的深度范围内工作。     

液晶光閥的进展

采用CdS光传感器的第一代液晶光阀(LCLV)构成了高分辨率大屏幕投影显示和光学数据处理应用的基础。一种新的第二代液晶光阀将采用Si集成电路技术以增强其性能以用于飞行员训练模拟、可见光到红外光的波长转换以及连续的电子数据的高速处理。     

非线性电阻负载上精确调节的长脉冲Biumlein线波形的产生

本文叙述了长脉冲设计中利用调补偿Blumlein线的规则。该线对非线性负载(如速调管)能形成宽度为100微秒、中等重复频率为1千周、幅度为200千伏的脉冲,总的负载功率偏差小于0.5％(包括波动、过冲和顶降)。     

Nanochannel electroporation delivers precise amounts of biomolecules into living cells

Many transfection techniques can deliver biomolecules into cells, but the dose cannot be controlled precisely. Delivering well-defined amounts of materials into cells is important for various biological studies and therapeutic applications. Here, we show that nanochannel electroporation can deliver precise amounts of a variety of transfection agents into living cells. The device consists of two microchannels connected by a nanochannel. The cell to be transfected is positioned in one microchannel using optical tweezers, and the transfection agent is located in the second microchannel. Delivering a voltage pulse between the microchannels produces an intense electric field over a very small area on the cell membrane, allowing a precise amount of transfection agent to be electrophoretically driven through the nanochannel, the cell membrane and into the cell cytoplasm, without affecting cell viability. Dose control is achieved by adjusting the duration and number of pulses. The nanochannel electroporation device is expected to have high-throughput delivery applications.     

Large scale synthesis and enhanced field emission properties from hybrid CuO/ZnO nanorod

Upper-directionally grown nanorods were synthesized on a large scale by a simple method of direct heating of Cu foil in air. Hybrid CuO/ZnO nanorods were fabricated by ZnO thin film coating using magnetron sputtering. Field emission (FE) measurements of CuO and hybrid CuO/ZnO nanorod films show that they have turn-on field of 3.81 and 3.24 V/microm and a current density of 0.39 and 1.1 microA/cm2 under an applied field of about 6.6 V/microm, respectively. By comparing X-ray photoelectron spectroscopy analysis and the FE properties of two types of samples, we concluded that the narrowing of band gap due to the change of electron binding energy of hybrid CuO/ZnO nanorods effectively improved FE.     

Microstructural evolution and mechanical properties of NiCrAlYSi+NiAl/cBN abrasive coating coated superalloy during cyclic oxidation

Cyclic oxidation behavior of NiCrAlYSi + NiAl/cBN abrasive coating at 900 ℃ and the mechanical properties of the coating-substrate system were investigated.Results indicated that elemental interdiffusion occurred between the coating and substrate,which caused the formation of interdiffusion zone (IDZ) and second ary reaction zone (SRZ) during aluminization,while their compositions and structures changed with oxidation.AlN interfacial layer formed at cBN/metallic matrix interface during aluminization,while it transformed into multilayer oxides during oxidation.Due to the microstructural evolution of these interfaces,the fracture behavior and bending toughness of the system changed greatly during three-point bending tests.Besides,the damage mechanisms were discussed.