A velocity-difference-separation model for car-following theory

We introduce a velocity-difference-separation model that modifies the previous models in the literature. The improvement of this new model over the previous ones lies in that it not only theoretically retains many strong points of the previous ones, but also performs more realistically than others in the dynamical evolution of congestion. Furthermore, the proposed model is investigated with analytic and numerical methods, with the finding that it can demonstrate some complex physical features observed in real traffic such as the existence of three phases: free flow, synchronized flow, and wide moving jam; sudden flow drop in flow-density plane; and traffic hysteresis in transition between the free and the synchronized flow.     

Multifractal analysis of the Yellow River flows

This paper deals with time series of the Yellow River daily flows at Tongguan hydrological station, from the year 2000 to 2005. Power spectrum analysis and statistical moment scaling function on a range of scales revealed scaling qualities of the data. The partition function, which displayed a convex curvature, and the generalized dimension function showed that multifractality is presented. The singularity spectrum, which is single-humped, has shown strong multifractality degree.     

低温流量测量

低温流体的许多性质比较特殊 ,其流量测量不同于一般流体。文中对文丘里流量计、涡轮流量计和相关流量计等几种常用低温流量计的原理、基本技术参数和应用范围进行了介绍 ,并且对这几种流量计的性能进行了比较。     

WDM网状网中动态域间流量疏导策略

对波分复用(Wavelength Division Multiplexing,WDM)网状网中的动态域间流量疏导问题进行了深入研究.在源路由模式下,提出了一种基于固定备选路由方式的动态域间流量疏导算法,并在其基础上提出了只考虑波长均衡和同时考虑波长均衡与业务均衡的改进方法.该算法可以有效地避免路由环,得到较低的阻塞率,节省全网的收发器数目和波长资源.仿真结果表明,这种算法可以有效地改善网络性能.     

薄膜生长初期多原子移动影响的模拟

模拟了在低温底上沉积单层薄膜初期的表面形貌．提出了新的算法，实现了多个原子同时在沉积基底上移动的过程，克服了以往只能模拟基底上仅有一个运动原于的缺点，同时引入了沉积流量，并在此基础上讨论了移动步数、沉积流量等因素对生长的影响作用．模拟结果与实验相近，获得的花样具有分形特征．     

Measurement of Neutron Fluxes and Spectra during the NT-TBM Operation of CN HCSB

Neutronics measurement system provides neutron fluxes and spectra at the locations of beryllium multiplier and tritium breeder during the operation of the NT-TBM （D-D and D-T phase in ITER）. This is important for studying and assessing capabilities of beryllium multiplier and tritium breeder in the China helium cooled solid breeder （CNHCSB）. A special neutron diagnostic system has been proposed that allows to measure neutron fluxes and spectra without interrupt the operation of ITER. This system includes encapsulated foil activation analysis, micro-fission chamber detectors （MFC）, and a compact neutron spectrometer using natural diamond detector （NDD）.     

全光型硅微机械流量传感器初探

介绍一种新颖的全光型硅微机械流量传感器。给出该传感器结构及工作原理的理论分析，并阐述传感器样品的测试及结果。流量传感器具有带脊型波导的悬臂结构。悬梁用作器件的敏感区，而检测光束可以在脊型波导中传输。     

小流量条件下汽轮机多级三维粘性流场的数值分析

1绪言小流量条件下汽轮机内部流动具有比设计条件下更为复杂的特征，最突出的表现是随冲角的增大而出现的分离流、先速流。这种流态不仅影响汽轮机的运行效率，更重要的是它还与汽轮机的安全可靠性密切相关，它可能诱发叶片的失速颤振而使叶片断裂。虽然大的负攻角所引起的本级叶片的脱流现象已成共识，但对小流量条件下汽轮机内部流动的认识只有一些实验观测到的现象和二维的数值分析，并且只限于末级叶片。在文献＊中，我们对某一汽轮机低压缸末级和次末级叶片在0．35小流量工况下的两级流场进行了三维粘性数值分析，计算得到的分离流态同…     

体积流量法配制多组分气体混合物

建立了一种简便、价廉的多组分气体混合物的动态制备方法并设计和组装了动态体积配气仪。用气相色谱对动态体积配气仪配制的混合气体进行分析并与其理论配比相对照，结果表明，该方法的准确性、稳定性和重复性是令人满意的。此外，按照配气的过程对影响配气精度的因素进行了理论分析。分析表明，气流流速的稳定性、流速测定的准确性和气路条件的一致性是决定配气效果的主要因素。