优势区相图的计算机软件开发及应用

根据国内外的优势区相图计算机研究状况，作者采用化学势最小约束原理开发了一种新算法，并给出了新算法的程序框图和应用实例．新算法通用性强，效率高，便于计算机处理，能自动回收数据．     

似疏犹亲的印地安人

没见到印第安人时,对这个遥远的民族是很陌生的;可是见到他们之后,却似有缘,自有几分亲情在。难怪哥伦布会弄错哥伦布发现了新大陆,但不论美洲或美国都不以哥伦布作为美洲或美国的名字。美洲全称为亚美利加洲,美国全称为亚美利加合众国,都是以另一位意大利航海家亚美利哥·维斯普奇的名     

Evaluation of Surface Modification of Inorganic Filers

ＥｖａｌｕａｔｉｏｎｏｆＳｕｒｆａｃｅＭｏｄｉｆｉｃａｔｉｏｎｏｆＩｎｏｒｇａｎｉｃＦｉｌｅｒｓＣｈｅｎＨｏｎｇｇａｎｇ（Ｄｅｐｔ．ｏｆＣｈｅｍ．Ｅｎｇ．）ＡｂｓｔｒａｃｔＴｈｒｅｅｋｉｎｄｓｏｆｉｎｏｒｇａｎｉｃｆｉｌｅｒｓｗｅｒｅａｃｔｉｖａｔ...     

幽门螺杆菌感染治疗的进展

<正> 近几年深入研究得出了惊人的结果:约96％十二指肠溃疡和约70％胃溃疡应做为感染性疾病采观察。老的观点“无酸—无溃疡”扩展为“无酸或无幽门螺杆菌—无溃疡”根据这个结论,最常见多发胃十二指肠溃疡通过一段时间治疗是可以长期治愈的,众多深入研究明确指出:治愈幽螺杆菌感染可以进一步完全修复胃十二指肠溃疡底部粘膜从而加速治愈溃疡。首先是使对治疗不敏感的溃疡治愈,特别是在根除幽门螺杆菌后消化性溃疡稳定缓解,溃疡复发率几乎为零。相比之下幽门螺杆菌阻性的胃溃疡复发率为50％,十二指肠溃疡复发率70％～90％。并且在根除幽门螺杆菌后能减少溃疡并发症。对初发的胃十二指肠溃疡是否应该抗菌治疗仍有争议(表1)。     

Design of Luenberger function observer with disturbance decoupling for matrix second-order linear systems-a parametric approach

1.INTRODUCTIONThere have been many approaches to disturbance de-couplinginlinear multivariable control systemdesign.Linnemann[1]proposed a numerically stable algorithmfor disturbance decoupling by measurement feedback.Van Der Woude[2]considered the combined problemof disturbance decoupling and stabilization by mea-surement feedback.Syrmos[3]proposed a numericallyefficient algorithm based on Sylvester equations forthe problemof disturbance decoupling with arbitrarypole placement usingstat…     

Adaptive control of system with hysteresis using neural networks

1.INTRODUCTIONThe piezoelectric actuators are well suited for micro-position devices in precision engineering because oftheir fast response,nanometer resolution and biggerdriving force[1].However,hysteresis inherent topiezoelectric actuator severely li mits system’s perfor-mance such as giving rise to undesirable accuracy oroscillations,even leading to instability.Hysteresischaracteristics are generally nondifferentiable andusually unknown.It is a difficult task to mitigate itsharmful ef…     

Fuzzy controller design for networked control system with time-variant delays

1.INTRODUCTIONAs a system becomes more and more intelligent andflexible,the systemrequires more sensors,actuators,and controllers,which are often referred to as fielddevices.In most cases,these field devices requiresome type of electrical connection because they aredistributed over a certain area.Conventionally thesedevices are connected with point-to-point connec-tions,whichis not suitable any more for modern in-dustrial control systems,because the number of cableis proportional tothe squ…     

Feedforward and feedback optimal control for linear time-varying systems with persistent disturbances

1 .INTRODUCTIONIn nature ,there are various external disturbancesaffecting the performances of systems . Many con-trol problemsinvolve designing a controller capableof stabilizing a given linear system while mini mi-zing the worst-case response to some additive dis-turbances . This problemis relevant to disturbancerejection and cancellation. One application area ofinterest is flight control through wind shear ,where disturbances arise from a modal for windshear based on harmonic oscillati…     

Target tracking based on frequency spectrum amplitude

1 .INTRODUCTIONIn target tracking, attribute parameters can beused to i mprove the performance of data associa-tion. The probabilistic data association ( PDA)which employ the attribute enhance the capabilityof data association and i mprove the performancefor target tracking. The method of PDA is per-formedin the environment of high signal to noise(SNR) generally and the SNRis in excess of 10dB.But the SNRinthe actual environment is lowerthan 10 dB commonly . When SNRis below0 dB,…     

Efficient structures for wideband digital receiver

1 .INTRODUCTIONWith the development of high perfor mance ana-logue-to-digital converters ( ADC) , applicationspecific integrated circuit ( ASIC) devices anddigital signal processing ( DSP) technology , dig-ital receiver has increasingly become popular inrecent years[1 ~7]. The digital receiver is a typi-cal application of software radio in radar . Itsmain purpose is to move the digital conversionprocess closer to the antenna and execute mainfunctions on general hardware . But the sign…