High-performance Si/SiGe n-type modulation-doped transistors

Enhancement-mode Si/SiGe n-type modulation-doped transistors with a 0.5-μm-length T-gate have been fabricated. Peak transconductances of 390 mS/mm at room temperature and 520 mS/mm at 77 K have been achieved. These high values are attributable to a combination of the high quality of the material used, having a room temperature mobility of 2600 cm²/V-s at an electron sheet concentration of 1.5×10¹² cm², and an optimized layer design that minimizes the parasitic series resistance and the gate-to-channel distance     

Plasmin, substilisin-like endoproteases, tissue plasminogen activator, and urokinase plasminogen activator are involved in activation of latent TGF-beta 1 in human seminal plasma

OBJECTIVES: To compare the effects of simulated and mild actual hemorrhage on parameters used traditionally to assess hemorrhaging patients: heart rate (HR), blood pressure (BP), and Shock Index (SI = HR/systolic BP), with stroke distance (SD) measured ultrasonically as an index of cardiac stroke volume. MATERIALS and METHODS: Hemorrhage was simulated in 19 healthy volunteers by the application of graded lower-body negative pressure (LBNP) (0, -20, -40, and -60 mm Hg) to pool blood in the lower body and reduce venous return. Measurements were also made before and after a standard blood donation (450 mL) in nine healthy volunteers. MEASUREMENTS and MAIN RESULTS: SD decreased significantly and progressively from the baseline level of 23.8+/-5.7 cm (mean+/-SD) at each level of LBNP: by 3.4+/-1.9, 7.4+/-2.5, and 11.8+/-3.2 cm at LBNP of -20, -40, and -60 mm Hg, respectively. Neither HR nor SI changed significantly at the lowest level of LBNP (-20 mm Hg), but they showed progressive, significant increases thereafter. Mean BP did not change significantly at any level of LBNP. Similarly, after a controlled hemorrhage of 450 mL, SD decreased significantly by 3.3+/-1.6 cm from 22.2+/-2.8 cm, whereas HR and SI remained unchanged and mean BP increased slightly. CONCLUSION: Changes in SD may provide an earlier indication of progressive blood loss than either HR or BP alone or in combination.     

具有开发前景的超声波复合土工布

本文简要介绍了超声波复合土工布的复合机理与设备以及超声波复合土工布的性能。超声波复合与其他复合方法相比有许多优点 ,值得进一步研究。超声波复合土工布是具有开发前景的一种新型复合土工布。     

碾压混凝土坝渗流特性与渗流控制对策

根据碾压混凝土坝渗流特性，通过理论分析和实践，从胶凝材料含量、层面施工间隔时间、渗控结构设计等方面来控制碾压混凝土坝的渗流，提高大坝的稳定性、耐久性。     

HgCdTe离子注入掺杂及损伤特性

运用红外反射谱，背散射谱和二次离子质谱等方法研究ＨｇＣｄＴｅ注入Ｂ、Ｐ、Ｉｎ和Ａｓ等元素的掺杂与损伤特性。     

MEMS: the path to large optical crossconnects

Continuous growth in demand for optical network capacity and the sudden maturation of WDM technologies have fueled the development of long-haul optical network systems that transport tens to hundreds of wavelengths per fiber, with each wavelength modulated at 10 Gb/s or more. Micro-electromechanical systems devices are recognized to be the enabling technologies to build the next-generation cost-effective and reliable high-capacity optical crossconnects. While the promises of automatically reconfigurable networks and bit-rate-independent photonic switching are bright, the endeavor to develop a high-port-count MEMS-based OXC involves overcoming challenges in MEMS design and fabrication, optical packaging, and mirror control. Due to the interdependence of many design parameters, manufacturing tolerances, and performance requirements, careful trade-offs must be made in MEMS device design as well as system design. We provide an overview of the market demand, various design trade-offs, and multidisciplinary system considerations for building reliable and manufacturable large MEMS-based OXCs     

软件无线电及其实现技术

软件无线电是一种新兴技术，通过软件使多种业务、多种标准、多个频段与灵活的无线电系统的组合成为可重新配置和可重新编程的。介绍了软件无线电的概念及系统结构，并进一步讨论了现阶段软件无线电所面临的技术问题以及相应的实现方案。     

轻质莫来石浇注料及其在轧钢加热炉上的应用

介绍了轻质莫来石骨料及用该骨料配制的轻质莫来石浇注料的性能，并介绍了该浇注料在轧钢加热炉上的应用情况。     

Investigation and modeling of stress effects on the formation of cobalt salicide

This letter studies resistance variations of the Co salicide interconnect accompanied by various surrounding in a sub-0.13-/spl mu/m CMOS technology. Our analysis shows that, during the salicidation processes, the diffusion of Co atoms and thus salicide thickness and forms of Co salicide layer are greatly affected by the stresses from surrounding structures. Moreover, variations in resistance among the various structures could exceed 100%. Thus, these stress effects were analyzed in detail based on transmission electron microscopy micrographs of Co salicide layers accompanied by four different surrounding structures.     

Many strings attached: from conventional to robotic marionette manipulation

This paper introduces the evolution of traditional marionette design and manipulation skills from an engineering perspective and describes a novel system developed in Nanyang Technological University, called Robotic Marionette Systems (ROMS). Through the development of ROMS and the marionette motion generation methods, the possibility of infusing modern robotic and mechatronic technology into the traditional art form of marionette performance is explored while, at the same time, evoking and stimulating public interests in this art form.