COLOR DOPPLER AND DOPPLER SPECTRAL ANALYSIS IN THE SPINAL CORD OF NORMAL DOGS

Doppler ultrasonography of the spinal cord was performed in 34 normal, anesthetized dogs following hemilaminectomy. This study was part of an investigation to evaluate the efficacy of a 21-aminosteroid compound and high dose methylprednisolone for the treatment of spinal cord trauma. Grey-scale images of the canine spinal cord were similar to those described for the spinal cord of people. Doppler waveforms of intraparenchymal spinal arteries exhibited high end diastolic blood flow velocities, indicating low resistance to flow. Doppler values (mean ± SD) for arteries immediately ventrolateral to the central canal were: Peak Systolic Velocity = 5.78 ± 2.5 cm/sec, Minimum Diastolic Velocity = 3.5 ± 1.62 cm/sec, Mean Velocity = 4.45 ± 1.96 cm/sec, Minimum Diastolic Velocity = 3.5 ± 1.62 cm/sec, Mean Velocity = 4.45 ± 1.96 cm/sec, Systolic/Diastolic ratio = 169 ± 0.19, Pulsatility Index = 0.53 ± 0.09, and Resistance Index = 0.4 ± 0.06.     

对在高校实施大学生创业教育的思考

在高校实施大学生创业教育，对于全面提高大学生的综合素质，增强大学毕业生应对就业的能力，都具有十分现实的意义。但同这方面的工作在全国大多数高校都处在起步阶段，尚有许多需要深化认识、完善机制、强化措施的问题。有鉴于此，作者提出了一些思路与对策。     

促进我国汽车检修行业发展的模块化仿真

本文以汽车检修企业为例分析了集中优化的必要性和重要性，利用模糊数学综合评判理论的基本原理和方法，建立优化的数学模型，阐明优化检修企业的具体方法和步骤，并应用有关数据进行分析和验证，说明集中优化汽车检修企业具有广阔的发展前景。     

地形诱导的弹状流生成特性研究

通过对受丘陵地形影响的油气两相管流的模拟试验研究，观察到这种两相流具有复杂的流动特性，它与普通两相流在各自倾角管段上的流动不同。由于丘陵地形的影响，油气两相流在流动过程中的流动特性会发生很大变化，最明显的首先是流型的变化，油气两相流流经向下倾斜管段和向上倾斜管段的下凹肘部时，会有新的液弹产生；流经向上倾斜管段和向下倾斜管段的上凸肘部时，原有的液弹则可能会消失。上游水平段已有的弹状流在流经丘陵管道时，弹状流的特性如频率和液弹长度都会发生变化。     

用现金流量账法编制现金流量表

现金流量表的编制方法有直接法和间接法，直接法又分为工作底稿法，T型账户法，根据账户记录直接编制法。当企业的规模较小，经济业务不多且实行了会计电算化时可采用“根据账户记录直接编制法”，此法俗称“现金流量账法”，它把编制现金流量表的工作分散到平时，从而正式编表时非常简单易行。     

PULSED WAVE-DOPPLER ULTRASONOGRAPHIC EVALUATION OF THE COMMON CAROTID ARTERY IN THE RESTING HORSE: PHYSIOLOGIC DATA

A pulsed wave-Doppler ultrasonographic evaluation of common carotid arterial blood flow was carried out on 63 healthy Italian Saddlebred horses. Vessel diameter and tracing morphology were evaluated were evaluated and blood flow parameters (systolic, diastolic and mean velocity, acceleration and deceleration of the systolic wave, cartid pulse volume) were calculated and correlated with class variables (sex, age and body weight). On the basis of the presence of an incisure in the ascending branch of the systolic curve, subjects were divided in two groups: one with a bifid systolic curve and the other with a monophasic aspect. Correlations between: 1) diameter of the vessel and body weight and 2) carotid pulse volume and flow velocity (systolic, diastolic and mean) were found. A greater systolic pulse volume was found in male subjects, in subjects with greater body weight and in those which had a monophasic systolic wave.     

SIDD的实践与思考

分析了我国现阶段灌区管理现状，介绍了国外代表性的灌区管理模式，针对我国的实际情况，提出了一种较为先进的农业灌溉管理模式，即体现经济自立，视水为商品的SIDD模式，并根据国内几个灌区SIDD的实践，评价了SIDD试点的成效，探索了存在的典型问题与对策。     

基于OAS的抵押支持证券的利率风险度量

在介绍传统麦考莱持续期与凸度衡量抵押支持证券价格对利率敏感性的基础上，分析了麦考莱持续期和凸度在测量隐含期权债券价格利率风险时存在的局限性。提出了更能准确度量利率风险的基于期权调整利差技术的持续期和凸度，即DC憾和COAS，给出了OAS测量债券价格利率敏感性的方法和步骤；并利用利率模拟技术和现金流计算模型。给出了求解OAS的详细过程．     

注塑模多型腔流道优化设计

在注塑成型过程中,浇注系统尤其是多型腔浇注系统的设计合理与否对产品质量和效益都有决定性影响。为此,不袭用传统的浇注系统设计方法,在前人研究的基础上导出了新的流道系统优化设计模型,并在MODEFLOW软件模拟中得到验证。