Motion sickness: a synthesis and evaluation of the sensory conflict theor Man Vehicle Laboratory, Massachuserrs Institute of Technology, Cambridge, MA 02139, U.S.A Received December 15. 1988 M. 1990. Motion sickness: a synthesis and evaluation of the sensory conflict theory. Can. J. Physiol. Pharmacol erebral ischemia

Despite its apparent simplicity this equation appears in a wide range of dis m heat 7 to financial er we will make extensive use of this equation, and several of the limiting cases contained therein, to illustrate the numerical techniques that will be presented

HASH造表、查表方法广泛而有效地应用于计算机基本软件和应用软件的设计中,尤其在计算机的数据处理和数据库技术中,更为如此。本文使用初等的数学方法对这种先进的查找技术的效率—表平均查找长度A进行了理论上的讨论,同样得到了前人已经得到的两个理论计算公式。此外,我们还在M—150计算机上做了随机模拟试验,得到了一系列试验结果,支持和验证了理论的正确性

1886年,A. Mayer 发现具有传染性的烟草花叶病毒; 1892年,D. Ivanovsky烟草花叶病病原体能通过 细菌滤器:一种能通过细菌滤器的”细菌毒素” 或极小的细菌” 1898年，M W Beijerinck对烟草花叶病病原体的研究 结果:能通过细菌滤器;可被乙醇沉淀而不失去 其感染性,能在琼脂凝胶中扩散;用培养细菌的 方法不能被培养出来,推测只能在植物活细胞 中生活；

100 Control Systems W.L. Brogan, G.K. F. Lee, A P Sage, B.C. Kuo, C L. Phillip R D. Harbor, R.G. Jacquot, J.E. McInroy D P. Atherton, J.S. Bay W.T. Baumann, M-Y Chow Models. Deynamic Response. Frequency Response Methods: Bode Diagram Approach RootLocus.compensation.DigitalControlSystems.nonlinear Optimal Control and Estimation. Neural Control

为了研究中国核电主管道铸造不锈钢Z3CN20-09M的热老化,在300、350和400℃下,对Z3CN20-09M进行了长达30000h的加速热老化实验.对不同热老化时间下的样品进行了冲击性能和铁素体纳米硬度测定.以夏比冲击功作为热老化脆化参量,利用拟合的方法得出该材料的热老化激活能为51.962kJ·mol-1.通过热老化因子P得出了用夏比冲击功表示的热老化脆化动力学公式.利用热老化激活能和热老化动力学公式预测了Z3CN20-09M在实际运行温度下服役40a内的夏比冲击功和铁素体显微硬度变化.预测结果表明在运行5a内是该材料韧性迅速下降的时期,随后的运行过程中下降过程趋缓

The effects of different firing temperatures on the stability of perovskite phase, grain size, and dielectric properties were investigated by XRD, TEM, SEM and dielectric measurements. The dielectric ceramics of Pb(Mg1/3Nb2/3)O3-PbTiO3-BaTiO3 system were obtained by chemical coprecipitation in water. The ceramics have higher dielectric constant (7003-9714), lower firing temperature (950-1150℃), quite uniform microstructure with grain size less than 2.5μm, and lower temperature coefficients of capacitance. As a result, it was confirmed that the simple and low cost chemical route used namely coprecipitation in water is a desired meth-od for preparing high property dielectric materials applicable to multilayer capacitors

The role of Mg in alloy/718 has been systematically investigated. Mg raises not only high temperature tensile and stress-rupture ductilities but also increases considerably smooth and notch stress-rupture life. Mg containing alloy 718M is free of stress-rupture notch sensitivity. Mg improves creep and fatigue interaction properties （LCF or cyclic stress rupture） at any grain size. The basic role of Mg is equilibrium segregation at grain boundaries which helps to change continuous grain beundary (5-Ni3Nb morphology to discrete globular form which has a retardation effect on intergranular fracture. Mg promotes the change from intergranular to transgranular fracture mode

6-5如图6-5所示,一定量的空气,开始在状态A,其压强为2.0× 105Pa,体积为2.0×10-3m3,沿直线AB1.010P 变化到状态B后,压强变为1.0×105Pa

Linear Transversal Equalizers Nonlinear Equalizers. Linear 70.3 Receivers. Nonlinear Receivers 70.3 Spread Spectrum Communications Brief History Why Spread Spectrum? Basic Concepts and M. K. Simon Terminology. Spread Spectrum Techniques. Applications of Jet Propulsion Laboratory Spread Spectrum 70.1 Error Control Coding Richard C. Dorf and Zhen Wan Error correcting codes may be classified into two broad categories: block codes and tree codes. A block code