运用Simulink实现抑制载波双边带调制的载波提取

分析了在接收端对抑制载波双边带调制信号的载波提取的重要性和可行性,运用matlab中的仿真工具箱simulink实现了载波提取的具体过程。其中包括:平方变换法提取载波和插入导频法提取载波,并举例验证其可行性。最后比较了两个方法的适用范围。结论表明:实验仿真和理论推导的结果基本一致,并可推广到单边带和残留边带调制信号的载波提取中。     

Comparison of Downer and Riser Based Fluid Catalytic Cracking Process at High Severity Condition: A Pilot Plant Study

Integration of refining and petrochemicals offers economic benefits to both the industries. Converting low value refinery products to high value petrochemicals require novel processes and extra investment. Though FCC is not a new process to the refining industry, it still has a potential for modification to enhance light olefins demanded by reformulated gasoline and the petrochemical industry. In this article a novel, High Severity FCC process based on the downer reactor is presented. Supported by the pilot plant study and comparison with riser, it is shown that the downer FCC reduces backmixing, which is the main cause of gasoline overcracking. Reduction of backmixing reduces coke and dry gas formation, resulting in increased yield of gasoline. Despite the operation at higher temperature, there is reduction in the thermal cracking. Though the light olefins yield is lower in case of downer, the total yield of useful products (gasoline + light olefins) is higher in downer as compared to the same from a riser. The increased yield of gasoline from downer can be converted to light olefins by using ZSM-5 based additives.     

Extended Pilot‐Based Coding for Lossless Bit Rate Reduction of MPEG Surround

Pilot‐based coding (PBC), which is used for lossless bit rate reduction of audio coding, has been recently proposed for MPEG Surround. We propose extended PBC for further lossless bit rate reduction of MPEG Surround. Extended PBC selects the number of pilots depending on the parameter band number and the type of spatial parameter. It then encodes the pilots and the relevant difference data. Experiments show that extended PBC is more effective than the original PBC, especially for high bit rate modes, with a negligible complexity increase on the decoder side.     

Approximating the Outage Probability of the Pilot Channel for IS‐95‐Based Cellular CDMA Systems in the Soft Handover Region

This letter presents an approximation of the outage probability of the pilot channel that can be used for CDMA cell planning. The approximation can determine system parameters for soft handover in IS‐95‐based cellular CDMA downlink design. Computer simulations show that our analytical results agree with empirical results.     

Experimental modelling of a pilot lignocellulosic pellets stove plant

Small-scale stoves, producing heat and hot water, are suited for domestic purposes. In order to optimise their efficiency when using lignocellulosic pellets, an important task is to do research on their real performance. The general behaviour depends on many operational factors (air flow and humidity, pressure,…), dimension and pellets characteristics (moisture, size, raw material, density, friability,…). In this paper, the first results and general performance of a 24 kW pellet fixed bed stove pilot plant are presented. The plant has been designed to study pellet combustion in the laboratory. The main targets are to reduce emissions of pollutants and to improve energy efficiency. Different situations can be simulated and tested due to its flexible design. Temperatures, pressures, flows and emissions are measured and analysed. An extensive study of different load conditions is presented through the application of both an experiment design technique and the later statistical analysis of the results. Fuel characterisation is also presented.     

塔里木沙漠公路科技攻关综述

世人瞩目的塔里木沙漠公路为“八五”国家重点攻关项目，获“1995年十项重大科技成就”荣誉称号。本文综述沙漠公路塔中段科技攻关的主要决策管理过程，报道多项科技成果工程化产业化的实施步骤，介绍针对公路沿线地理气候特征的防沙治沙的主导攻关方向、主要成果及其维护生态平衡和沙漠公路的积极保障作用。     

逐层上返注水开发先导试验研究

分析了文东油田的开发状况，总结和评价了历年来的主要做法及效果，认识到文东油田水驱开发状况差，缺少开发的有效手段。论述了开展先导试验的必要性和关键技术，提出开展文13－128块逐层上返注水开发试验，研制了总体设计方案和第一试验层实施方案。通过两年来的试验，取得了初步成功，为深层、异常高温高压低渗多油层油田开发积累了宝贵经验。     

高强度低合金SA633D钢的研制

叙述了ＳＡ６３３Ｄ钢的工业性试制工艺，对ＳＡ６３３Ｄ钢的组织和低温韧性进行了试验研究，测定出钢板晶粒度为９－１１级，其脆性转变温度为－５２℃。结果证明：舞钢生产的ＳＡ６３３Ｄ钢质量已达到美国ＡＳＭＥ ＳＡ６３３标准中Ｄ级钢要求。     

注汽速度对蒸汽驱开采效果的影响

在对前人有关注汽速度方面的室内研究工作进行了重新分析后，发现试验获得的最佳注汽速度均大于１２０ｔ／ｄ。国个３６个蒸汽驱现场试验结果统计规律表明，蒸汽驱油汽比不仅与地质参数有关，而且与注汽速度密切相关。１５个注汽速度小于１１０ｔ／ｄ的蒸汽驱现场试验有１０个是失败的（以油汽比为０．１５为标准），只有５个是成功的，另外２１个注汽速度大于１２０ｔ／ｄ的蒸汽驱现场试验都是成功的，并且是现出注汽速度愈大油汽经     

桶内搅拌水泥固化实验装置

本文描述了放射性废液水泥固化的中试实验装置和固化过程,给出了该装置较好的操作条件。它用模拟泥浆和浓缩液进行了一些有关该装置的性能实验,其结果表明,这个装置是可用的,由制得的固化体的物理性能令人满意。