两款网圈专利产品的特点和应用

为了提高网圈性能，替代进口，降低集聚纺成本，从网圈的功能着手总结了对传统网圈产品的认识。简明地介绍了两款专利网圈产品的特点及优点，指出NWQ66型网圈纬密大、经密小，寿命长；TWQ型网圈中间工作区经、纬密小，两边传动区经、纬密大，集聚效果好，耐磨，寿命长。并从理论方面为变密度网格圈的优化拓展了空间，为集聚纺关键部件的设计提供了一种手段。     

加工时间线性递减的链约束单机排序问题

讨论了工件的加工时间是开工时间的线性递减函数、工件之间有平行链约束的单机排序问题.对于链可中断和不可中断两种情况,给出了极小化总完工时间的最优算法.     

测量机器人视场内多目标问题的研究

利用Leica TCA1800对测量机器人视场内出现多目标的问题进行了实验研究,其结论有助于在工程监测时,作为选择监测站的位置和布设监测点的参考,以便有效地避免出错信息.同时给出了在编写自动监测程序时的处理方法,可以使得程序能够顺利运行并在监测过程中找到正确的观测点.     

价值管理在设计阶段的实证研究

价值管理的理念给建设工程项目管理提供了一个全新的视角。本文通过对建设项目价值管理概念的分析,并从如何选择价值分析的对象着手,进而阐述价值系数的计算方法以及价值研究的工具,最后通过结合工程项目实证研究,总结了大跨度楼盖结构设计的VM研究方法。     

Experimental study on response of hot wire and cylindrical hot film anemometers operating under varying fluid temperatures

The working principle of constant temperature anemometer (CTA), used for fluid velocity and/or turbulence measurements, is based on convective heat transfer from a sensor (a hot wire or a hot film) to the fluid being measured. Response of a CTA, working in temperatures other than its calibration temperature, involves errors which must be corrected for reliable measurement data. We have experimentally studied the effect of variations in fluid temperature on the response of hot wire and cylindrical hot film anemometers, and have discussed the application of different correction factors. Effects of overheat ratio (sensor temperature) and fluid velocity on the CTA output voltage correction factor have been discussed. The results show that the error in the CTA response depends on the sensor temperature, and it shows a decrease with increasing sensor temperature (increasing overheat ratio). The results also show that the error correction factor depends on the overheat ratio and fluid velocity. The required error correction factor also depends on whether the fluid temperature decreases or increases with respect to the calibration temperature of the CTA. In spite of differences in sensor characteristics, our work on cylindrical hot film sensors shows that the correction factors for hot wire and hot film sensors are similar and close in magnitude.     

重尾分布情形下一类破产概率的研究

讨论索赔量的分布为一类重尾分布,研究了在发生索赔次数与收取保费次数不独立的情形下,保险公司发生破产的概率分布.通过正规变化函数的Potter界,先给出特殊模型下保险公司发生破产的概率分布的界,进而得出一般模型下保险公司发生破产的概率分布的极限表达式.     

乌江流域水沙变化特性及其原因分析

乌江流域是三峡入库水沙来源之一,近年来水沙特性发生了明显变化。1980-2004年与1979年前相比,武隆站年均径流量变化不大,但悬移质输沙量减少了1 140万t,减幅35%。乌江渡电站建成后,乌江干流各站水沙关系均发生显著变化,同径流量下输沙量大幅度减小。水利工程拦沙是武隆站输沙量减少的主要因素,乌江上游东风、普定和乌江渡等电站年均拦沙量为1 500万t左右,导致武隆站输沙量减小约1 030万t。随着乌江干流大型水电站的陆续兴建,流域输沙量在未来一段时期将进一步减小。     

A comparison of antioxidant properties between artisan‐made and factory‐produced chocolate

The antioxidant capacities and the total phenolic content in cocoa liquor directly manufactured chocolate from an artisan manufacturer were measured using different in vitro methods (BR, TEAC, and Folin–Ciocalteu Reagent). These parameters were then compared with those of a chocolate made by a leading manufacturing company producing chocolate and cocoa‐containing products. A statistical analysis of the collected data showed that the antioxidant properties of the artisan‐made chocolate are significantly better than those of the factory‐produced one. These results were ascribed to the fact that all the bioactive components in the cocoa beans are better preserved in the artisan‐made chocolate.     

相控建模技术在阿南油田阿11断块中的应用

二连盆地阿南油田阿11断块处于高含水开发阶段,储集层非均质性严重影响开发效果.为了精确描述储集层物性及其展布特征,综合应用地震、测井、地质和开发动态研究成果,应用相控建模技术,采用两种或多种建模方法联合工作的思路,分步建立了构造模型、沉积微相模型以及微相控制下的储集层属性模型.通过油气储集层相控与非相控物性参数模拟结果的对比,认为相控属性模型对油藏非均质性的描述更为合理,使Petrel地质建模与Eclipse数值模拟一体化无缝链接,依据模拟结果采取综合治理措施,提高了油藏采收率.阿南油田的成功应用表明,相控建模技术可较好地解决沉积微相变化快、非均质性严重的储集层物性参数的模拟,为油藏后期开发调整提供了可靠的地质模型基础.图8参18