超高、大跨度混凝土结构模板施工

本文通过工程实例,详细介绍了超高、大跨度混凝土结构模板及支撑施工工艺。     

Parametric study of the electrical to thermal power conversion in an inductively coupledrf plasma torch

An inductively coupled (ic) radio-frequency (rf) stabilized argon plasma was generated in a quartz tube using a 7 MHzrf generator. The electrical and thermal powers were measured and the efficiency of energy conversion was computed. The results indicate that for a constant power input, there is an optimum argon flow rate for which maximum energy conversion efficiency occurs.     

Transistors made in laser recrystallized polysilicon on insulator films

lpcvd polycrystalline silicon films were deposited on thermally oxidized silicon as well as onlpcvd silicon nitride deposited on silicon. Acw argon ion laser was used to recrystallize the polysilicon film into large grains (grain size from 5μm to 40μm). Boron was then implanted and standard N-channel silicon gate process and N-channel metal gate process were carried out to realisemosfets on this material. Channel mobilities upto 450 cm²/V-sec for electrons have been measured. This thin filmmosfet has a four-terminal structure with a top and a bottom gate and the influence of one gate on the drain current due to the other gate has been investigated. Comparison of theI _D v-V _D curves of the devices with physical models was found in good agreement.     

Radiation-induced modification of polyurethane with hydroxyethyl methacrylate: blood compatibility

An attempt is made to develop the hydrophilic grafting of polyether urethane urea with hydroxyethyl methacrylate (hema) using⁶⁰Coγ-irradiation for achieving optimum hydrophilic/hydrophobic property needed towards blood compatibility. Contact angle method and platelet adhesion from calf’s blood are used to determine the suitability of these modified surfaces.     

X-ray spectroscopy and local structures in glasses

X-ray spectroscopy which is a combination of two techniques, namely x-ray absorption near edge structure (xanes) and extended x-ray absorption fine structure (EXAFS) analyses, is a unique technique for the study of local structures in glasses. Availability of synchrotron radiation sources has made the technique quite attractive and useful because the photon flux from synchrotrons is very intense and polarized. In this article, a brief summary ofxanes andEXAFS techniques is given along with a few applications to the study of local structures in glasses. Communication No. 323 from Solid State and Structural Chemistry Unit.     

Planning for the Subernarekha river system in eastern India

The study describes the systems studies carried out to plan a river basin in order to determine the nature and size of water storage facilities and releases for irrigation and industrial uses, and the associated cropping pattern. The model has been formulated in the framework of a linear programming model for a specific target year. This model is developed in the context of planning the Subernarekha river basin. The results are discussed and these provide information and insight suggesting the need for more disaggregated analysis of interaction between irrigation and related agroeconomic parameters.     

Fault tolerance in multiprocessor systems

Multiprocessor systems which afford a high degree of parallelism are used in a variety of applications. The extremely stringent reliability requirement has made the provision of fault-tolerance an important aspect in the design of such systems. This paper presents a review of the various approaches towards tolerating hardware faults in multiprocessor systems. It emphasizes the basic concepts of fault tolerant design and the various problems to be taken care of by the designer. An indepth survey of the various models, techniques and methods for fault diagnosis is given. Further, we consider the strategies for fault-tolerance in specialized multiprocessor architectures which have the ability of dynamic reconfiguration and are suited tovlsi implementation. An analysis of the state-of-the-art is given which points out the major aspects of fault-tolerance in such architectures.     

Design of a low temperature coefficient bandgap reference with a wide temperature range

In order to meet the requirements of different applications and markets for the accuracy and reliability of IoT chips,a low temperature coefficient bandgap reference with a wide temperature range is proposed.On the basis of the traditional Banba bandgap reference structure,the circuit utilizes high-order temperature compensation technology and piecewise temperature compensation technology to improve the curvature of the output reference voltage.The temperature coefficient of the circuit is reduced.At the same time,the operating temperature range of the circuit is extended.The circuit performances are verified in the TSMC 180 nm CMOS process.Test results show that the temperature coefficient of the circuit is as low as 7.2×10^-6/℃ in the range of-40 ℃ to 160 ℃.The power supply rejection ratio at a low frequency is -48.52 dB.The static current under the 1.8 V power supply voltage is 68.38 μA,and the core area of the chip is 0.025 mm².     

电厂宽负荷选择性催化还原脱硝技术改造

选择性催化还原（SCR）脱硝技术是我国电厂常用的脱硝技术。该技术运行中对烟气温度的要求比较严格,需要控制好SCR脱硝系统的入口烟温。针对这一问题,从影响SCR脱硝效率的关键因素及常见的宽负荷脱硝技术改进方案入手进行了分析。通过宽负荷脱硝技术改造,明显提高了SCR脱硝系统的入口烟温,进而提高了脱硝效率,减少了氨逃逸率,为电力行业脱硝技术发展提供了实际参考。     

宽频带范围下磁场能量收集的匹配网络设计

磁场能量收集技术是电磁环境中分布式传感器实现自供能的有效手段。与工频磁场和射频磁场等单一频率的磁场环境不同,电力变换器中的磁场分布具有宽频率范围特性。为了提高取能模块的功率密度,应尽可能多地在有限体积内收集能量,提出通过采用双级谐振-带通滤波网络。与此同时,基于相同取能线圈,充分对比了不同电流和负载特性下,单级谐振网络和双级谐振-带通网络的输出特性,归纳出双级谐振-带通网络的适用范围。