正倒锥体抗冰结构中粘弹性阻尼器的应用研究

叙述了在正倒锥体抗冰结构中增设粘弹性阻尼嚣对导管架平台进行减振控制的应用研究，并对该结构在简谐荷载和简化冰力激励下的幅频响应进行了计算分析，在此基础上．对粘弹性阻尼器参数的选取提出了建议。     

一种带旋转刮刀以及敲击震动功能的静止式弧面喷盘造粒喷头

农用硝铵改性后，熔融物料粘度大，含有固相悬浮颗粒，引起生产过程中喷头堵塞现象。为此设计了旋转刮刀、敲击震动装置，在实际生产应用中取得了较好的效果。     

高水头水泵水轮机工况转换期瞬间异常声音分析

本文对天荒坪抽水蓄能电站水泵水轮机在工况转换过程中导叶小开度时，水车室内发出的异常声音和振动进行了分析．认为异常声音、振动的出现是由于小开度时导叶激励振荡引起的。并介绍了消除异常声音的方法。     

黄骅拗陷涧南潜山区含油气系统划分与勘探方向

根据黄骅拗陷涧南潜山区烃源岩特点及构造关系，本文将该区划分为两大含油气系统：北塘含油气系统和南堡含油气系统。北塘含油气系统成藏的关键时刻为东营组沉积末期，其主要生烃层位为下第三系沙三段，形成沙河街组自生自储型原生油气藏。南堡含油气系统成藏关键时刻为明化镇组下段沉积末期(2Ma)，其主要生烃层位为沙一段及东三段烃源岩，可形成东营组自生自储型原生油气藏和上第三系次生油气藏。经分析，该区涧西断层下降盘的西部构造隶属北塘含油气系统，所以应以沙三段为主要目的层进行预探；涧西断层上升盘的东部构造隶属南堡含油气系统，所以应以上第三系及东营组为主要目的层进行预探。     

石油产品中硫含量测定方法评价

石油产品的硫含量质量指标,是与发动机的腐蚀及环保排放有关的重要项目.测定低含硫产品的准确性,从仲裁试验方法考虑,应评价GB/T 380[1]"燃灯法"同ASTM D4294[2]"X荧光法"两者的一致性.从试验结果分析,高含硫样品,两种试验方法的测定数据均接近;而对低含硫轻质油样品,燃灯法测定数据和X荧光法的高曲线数据均偏高,而X荧光法的低曲线测定硫含量数据较为合理.     

Prebooking reservation mechanism for next-generation optical networks

In future wavelength-division multiplexed networks, wavelength resources are efficiently utilized by statistical multiplexing and dynamic lightpath provisioning. In order to provide desired blocking probability and the ease of quality of service provisioning, this paper concentrates on the end-to-end connection acknowledged optical burst switching (OBS) protocols, and proposes a prebooking mechanism to improve the lightpath bandwidth efficiency, which consequently, reduces the blocking probability and better supports latency-sensitive traffic. The prebooking mechanism excludes lightpath acknowledgement delay from the lightpath holding time by "prebooking" each aggregated burst/flow based on the estimated characteristics of arriving traffic. More specifically, a burst length prediction and reservation strategy is proposed and analyzed for the widely observed self-similar incoming traffic. The simulation results show that the proposed excessive reservation strategy is able to achieve low bit loss caused by the prediction error. In addition, the proposed mechanism is also investigated with constant bit rate traffic in a large mesh backbone, such as NSFNET. The results demonstrate that in large networks, the proposed prebooking mechanism is able to bring significant benefits in terms of blocking probability and lightpath bandwidth efficiency. For example, with a maximum acceptable end-to-end delay of 90 ms and a 10/sup -4/ bit loss tolerance, our prebooking mechanism yields approximately double the supported traffic load relative to the familiar wavelength-routed OBS architecture.     

基于沃尔什函数的最小二乘动态建模方法及应用

本文研究了一种基于沃尔什函数的最小二乘传感器动态建模方法，并详细讨论了其实现步骤。这种方法以传感器时域动态校准数据为基础，可以直接得出传感器对应的微分方程或连续传递函数的系数。通过对仿真数据的辨识建模，证明了其有效性，并采用此方法对一种力传感器的脉冲响应曲线进行了实际的建模研究。     

渐速膛线身管内弹丸贴膛一般运动的研究

建立了非对称弹丸在挠性渐速膛线身管内作贴膛一般运动的微分方程组，求解了对称弹丸在渐速膛线理想身管内的贴膛运动规律。     

Regulation of classic and alternative bile acid synthesis in hypercholesterolemic rabbits: effects of cholesterol feeding and bile acid depletion

The effect of cholesterol feeding (3 g/day) on bile acid synthesis was examined in 10 New Zealand white rabbits (NZW), 8 Watanabe heterozygous and 10 homozygous rabbits with partial and complete deficiencies of LDL receptors. After 10 days of cholesterol feeding, bile fistulas were constructed and bile acid pool sizes were measured. Cholesterol feeding increased plasma and hepatic cholesterol levels in all rabbit groups. Baseline bile acid pool sizes were smaller (P < 0.01) in heterozygotes (139 +/- 3 mg) and homozygotes (124 +/- 30 mg) than NZW rabbits (254 +/- 44 mg). After feeding cholesterol, bile acid pool sizes doubled with increased cholic acid synthesis in NZW and, to a lesser extent, in Watanabe heterozygous rabbits but not in homozygotes. Baseline cholesterol 7alpha-hydroxylase activity in NZW and heterozygotes declined 69% and 53% (P < 0.001), respectively, after cholesterol feeding. Sterol 27-hydroxylase activity reflecting alternative bile acid synthesis increased 66% (P < 0.01) in NZW and 37% in Watanabe heterozygotes but not in homozygotes after feeding cholesterol. Bile fistula drainage stimulated cholesterol 7alpha-hydroxylase activity but not sterol 27-hydroxylase activity in all three rabbit groups. These results demonstrated that dietary cholesterol increased hepatic sterol 27-hydroxylase activity and alternative bile acid synthesis to expand the bile acid pool and inhibited cholesterol 7alpha-hydroxylase in NZW and in Watanabe heterozygous rabbits but not in homozygotes with absent hepatic LDL receptor function. Thus, in rabbits, sterol 27-hydroxylase is up-regulated by the increased hepatic cholesterol that enters the liver via LDL receptors whereas cholesterol 7alpha-hydroxylase is controlled by the circulating hepatic bile acid flux.