一类非线性常微分方程解的存在唯一性

在适当的自然结构条件下证明了完全非线性常微分方程F(t,u(t),u(′t))=0的周期粘性解的存在唯一性.     

国际干散货航运市场影响因素及规律

鉴于国际干散货航运市场的供求均衡关系及规律对市场预测和风险规避有积极的作用,运用经济周期理论,根据一系列主要衡量指标,探究引起国际干散货市场供求波动的因素,如全球经济发展、石油价格波动、钢铁产业发展、国家政策法规、自然原因等.在此基础上得出市场发展的内部波动性和周期性规律.根据对航运市场规律的分析,结合影响因素和未来发展趋势,对干散货运输企业和其他相关企业提出具有建设性的意见.     

Preparation of AIN thin films for film bulk acoustic resonator application by radio frequency sputtering

Aluminum nitride (AIN) thin films with high c-axis orientation have been prepared on a glass substrate with an A1bottom electrode by radio frequency (RF) reactive magnetron sputtering. Based on the analysis of Berg's hysteresis model, the improved sputtering system is realized without a hysteresis effect. A new control method for rapidly depositing highly c-axis oriented AIN thin films is proposed. The N2 concentration could be controlled by observing the changes in cathode voltage, to realize the optimum processing condition where the target could be fixed stably in the transition region, and both stoichiometric film composition and a high deposition rate could be obtained. Under a 500 W RF power of a target with a 6 cm diameter, a substrate temperature of 450 ℃, a target-substrate distance of 60 mm and a N2 concentration of 25%, AIN thin film with prefer-ential (002) orientation was deposited at 2.3 μm/h which is a much higher rate than previously achieved. Through X-ray diffraction (XRD) analysis, the full width at half maximum (FWHM) of AIN (002) was shown to be about 0.28°, which shows the good crystallinity and crystal orientation of AIN thin film. With other parameters held constant, any increase or decrease in N2 con-centration results in an increase in the FWHM of AIN.     

学科服务平台设计及用户黏度研究

在回顾并分析国内外学科服务平台建设现状及存在问题的基础上,考虑现阶段用户的学术生存环境及需求特征,结合东南大学图书馆学科服务平台的开发实践,提出一个以用户需求为驱动,馆员与用户共建学术社区、多维服务嵌入教学科研流程的学科服务平台设计思路,并探讨增强平台用户黏度的方法.     

习太极拳人血液流变学、血脂、血清钙磷等指标的追踪研究

连续两年为２８名长期从事太极拳运动的老年男子进行了血液流变学、血脂、骨钙磷代谢等指标的测定。结果表明：１．长期坚持太极拳运动可明显改善以血粘度为代表的血液流变学指标，２．可调节脂类代谢、降低血脂，增加ＨＤＬ－Ｃ及ＨＤＬ－Ｃ／ＴＣ比值，３．有效地减少机体骨矿物质的自然丢失，改善骨钙磷代谢。     

体育锻炼对宏观血液流变学某些指标的影响

笔者对有不同体育锻炼背景的１５５名体育学院学生进行了宏观血液流变学的研究工作，共观测了全血比粘度等６项指标。发现全血比粘度，随着体育锻炼背景的不同而不同，并具有显著的统计学意义（Ｐ＜０．０１）。研究结果显示，全血比粘度的适度下降是与一定的体育锻炼有关的，这对脑、心血管系统是有益的。     

河港散货装船机的选型探讨

我国内河港口码头散货装船设备还很落后。为加快提高我国河港的散货装船能力,新建造的散货装船机该采用何种机型,还处在探索阶段。本文从河港特点出发,对目前经常采用的五种散货装船机——墩柱式装船机、岸壁移机式装船机、浮式装船机、弧线摆动式装船机和直线摆动式装船机的结构型式进行了特点分析和对技术性能参数的比较,从而提出河港散货装船机的最好机型是直线摆动式装船机。本文对直线摆动武装船机工作原理进行了解释,对它的运动进行了分析,并提供了计算公式。     

血液的粘度与运动员血液

有训练的耐力运动员红细胞压积、血浆粘度和纤维蛋白原水平较一般人低，其主要原因是耐力训练使血浆容量增加较多。这种血液性状的变化对于改善血液的流复性、提高肌肉的供氧能力和增强运动能力有重要意义。     

Numerical Simulation of Underwater Explosion Loads

Numerical simulation of TNT underwater explosion was carried out with AUTODYN soft-ware. Influences of artificial viscosity and mesh density on simulation results were discussed. Deto-nation waves in explosive and shock wave in water during early time of explosion are high frequency waves. Fine meshes (less than 1 mm) in explosive and water nearby, and small linear viscosity co-efficients and quadratic viscosity coefficients (0.02 and 0.1 respectively, 1/10 of default values) are needed in numerical simulation model. According to these rules, numerical computing pressure profiles can match well with those calculated by Zamyshlyayev empirical formula. Otherwise peak pressure would be smeared off and upstream relative errors would be cumulated downstream to make downstream peak pressure lower.     

粮食物性和粮层阻力实验研究

对三种有代表性的粮食(大米、稻谷和玉米)在不同堆载高度下的物理性质和阻力特性作了比较详尽的实验研究。结果表明:粮食的孔隙率、粮层阻力与粮食堆载高度之间存在明显的非线性关系。在粮食机械通风数值模拟和工程应用中必须加以重视。