新型QPG1×8000-85型启闭机的研究

通过对启闭机关键部件卷筒的受力分析,研制出一种新的单吊点、双驱动、超大容量、高扬程启闭机.从理论上分析了它的整体工作性能.所依托工程的使用情况表明,该机达到了设计要求.     

利用手机模块实现无线公话的方法研究

本文论述了无线公话技术的实现原理，详细介绍了利用MCS8051系列单片机控制手机模块实现无线公话的方法，并给出了该类设备硬件各模块的功能描述以及关键部分软件的实现方法。     

采用多级技术的DBF雷达CCAB算法

数字波束形成算法中,CCAB算法在较高信干噪比条件下具有一定优势。但是计算时需要求逆矩阵,在阵元数较多的情形下运算量极大,很难实时实现,严重制约了其进一步的应用。提出了一种基于原有CCAB算法的多级计算方法,可以有效地减少运算量。实验表明,该方法虽然其信噪比性能比普通CCAB算法有所下降,但是仍能在干扰方向上形成较深的零陷并有效地抑制干扰,能够进一步应用于实际工程中。     

自动传输收视率调查系统

综述了当前收视率调查的主要方法 ,提出一种自动传输的收视率调查系统 ,详细介绍了该系统的组成、原理和设计思想 ,并分析了不同实现方法的优点与不足。应用表明 ,该系统在同类产品中具有明显优势     

STUDY ON PHASE PERCEPTION IN SPEECH

The perceptual effect of the phase information in speech has been studied by auditory subjective tests. On the condition that the phase spectrum in speech is changed while amplitude spectrum is unchanged, the tests show that: (1) If the envelop of the reconstructed speech signal is unchanged, there is indistinctive auditory perception between the original speech and the reconstructed speech; (2) The auditory perception effect of the reconstructed speech mainly lies on the amplitude of the derivative of the additive phase; (3) td is the maximum relative time shift between different frequency components of the reconstructed speech signal. The speech quality is excellent while td <10ms; good while 10ms< td <20ms; common while 20ms< td <35ms, and poor while td >35ms.     

Calderón-Zygmund型算子的研究

本文对通常的Calderón-Zygmund型算子稍加改造,仍得到满意结果.     

The geometry effects for stress intensity factor of sandwich specimen for measuring interfacial fracture toughness

The interfacial stress intensity factors for three types of sandwich specimens: the single edge crack tensile specimen, the three point bend specimen and the four point shear specimen were obtained by the finite element analysis and compared with the asymptotic solutions. The results show that the geometric effect for mode II specimen is larger than mode I specimen. The limit curves for geometry factor equal to 1.05 were obtained to indicate the usable range of validity of the asymptotic solution.     

Dependence of ion-pair induced self-pulsing in Er-doped fiber lasers on emission to absorption ratio

We show theoretically that the ion-pair induced self-pulsing in Er-doped fiber lasers depends largely on the ratio of emission to absorption cross sections, and can be significantly suppressed as this ratio is increased. Our experimental results agree qualitatively with this prediction. This result is important for stabilizing Er-doped fiber lasers where short-cavities and high-gain fibers are required.     

高含酸性气碳酸盐岩气藏流体敏感性实验研究

对川东北雷口坡组、嘉陵江组、飞仙关组、长兴组高含H，S及032的碳酸盐岩储层流体敏感性进行了实验研究，结果表明岩样速敏损害弱～强，水敏和盐敏损害中偏弱～极强，碱敏损害严重。岩石学分析揭示，川东北高含酸性气碳酸盐岩储层发育伊利石、微晶石英、白云石、方解石、硫化钙等潜在损害物质。钻井完井液侵入会破坏储层各物质间的原始动态平衡，诱发储层损害。主要损害机理为：①储层流体pH增加引起黏土矿物以及微晶石英失稳；②碱液与微晶石英、长石、白云石反应生成硅酸盐、高岭石、水镁石等新矿相；③流体矿化度改变可降低伊利石微粒间的连接力；④硫化钙水解产生OH^-，过量的OH-与Ca^2＋结合形成氢氧化钙沉淀；⑤储层含水饱和度和流体离子浓度改变，致使焦沥青脱附并在储层深部沉积；⑥硬石膏水化膨胀、分散运移。针对该气藏损害机理，可采用屏蔽暂堵技术以形成优质滤饼，有效降低储层流体敏感性损害。图5表2参10。