基于元胞自动机算法的三维玻璃微流控芯片湿法刻蚀模拟研究

以二维动态元胞自动机理论为基础,提出一种针对玻璃各向同性刻蚀特性的三维动态元胞自动机(Cellular automata)算法.利用创建刻蚀链表的方式代替传统的元胞搜索,提高了算法效率,并通过改进元胞信息的存储方式,使得三维元胞阵列得以存储于二维矩阵中.最后利用OpenGL技术对刻蚀结果进行三维成像.该算法在个人计算机上实现了较高分辨率(4000×4000像素)的三维刻蚀模拟与显示.通过对比玻璃刻蚀的实验结果和前人的研究评估模型,模拟结果完全能够实现对刻蚀结果的预测.文中的研究表明:建立的三维元胞自动机算法可以有效地应用于玻璃刻蚀过程的模拟.     

高灵敏度孔雀石绿选择电极的研制与应用

基于限进介质分子印迹聚合物二维功能材料(RAM-MIPs)对孔雀石绿离子通量的抑制、特异性识别和排除基体干扰能力,以孔雀石绿-四苯硼钠离子缔合物为电活性物质,构建成PVC为基质膜的高灵敏度孔雀石绿选择电极.在pH 3～pH 7.5溶液中,电极的线性范围为3.2×10-8～1×10-3mol/L,斜率为54.2 mV/pC,检出限为约7×10-9mol/L,选择性、精密度和准确度好.可用于水体、水产品中孔雀石绿的含量测定.     

新型稀土电极—水膜及PVC膜钐离子电极的制备

本文研究了新型稀土电极－水膜及ＰＶＣ膜钐离子电极的制备。水膜钐电极对低介电常数有机溶剂－磷酸三丁酯中的三价钐离子具有能斯特响应，响应曲线斜率为１９ｍＶ／ｐＣｓｍ＾３＋，线性范围是１．０×１０＾－４－１．０×１０＾－２ｍｏｌ·ｄｍ×－３，支持电解质和液接电势不影响响应典型的斜率。     

中空纤维支撑液膜处理含铜废水的数值模拟

处理含重金属离子的废水在环保和资源综合利用中备受关注,为了从微观机理上研究支撑液膜传质特性,建立中空纤维支撑液膜萃取铜离子的传质微分方程和有限差分法离散方程,并用Matlab迭代求解,得到铜离子在萃取过程中管内浓度轴向与径向的分布.分别模拟不同操作条件下的铜离子萃取情况,符合实验数据.表明在一定范围内,纤维管径增大、管...     

PVC膜碘离子选择电极的研制及对Ag~+的测定

以乙基紫与碘离子的缔合物（EVI）为电活性物质研制了PVC膜碘离子选抒电极、以正交试验法[1]确定传感膜的最佳组成．给出了电极响应斜率、线性响应范围、电极对I检测下限以及该电极测定Ag＋下限。     

面向与历史无关造型的三维约束求解方法研究

以基于历史的造型系统中应用较为成熟的两项技术——特征编码和二维约束求解为基础，基于特征进行三维约束建模，从而打破传统的基于历史造型系统中特征之间的单向依赖关系；然后将三维约束关系映射到二维草图进行处理，简化了问题．该方法在InteSolid 2．0上实现．     

圆柱绕流的二维数值模拟和尾迹分析

为指导机械设计中参数和布局的选择,研究固定在水流中的圆柱结构件的受力情况和流场分布．利用FLUENT中的三种湍流模型对雷诺数为3900的圆柱绕流进行二维数值模拟并进行对比,得到升力因数、阻力因数、分离角、斯特劳哈尔数和涡街尺寸等参数的模拟结果,与参考文献中的实验结果对比验证二维模拟的预测精度．RKE（Realizable k-ε）和雷诺应力模型（Reynolds Stress Model,RSM）均能在此雷诺数下得出接近实验结果的流场,RSM模型使用POWER LAW离散格式的结果优于QUICK格式．与三维模拟的对比表明二维模拟适合在设计初期的快速估算,能够快速得到合适精度的模拟结果．     

基于ArcGIS的洪水演进三维动态可视化系统设计

由于未考虑洪水演进过程的离散性和不稳定性，导致洪水演进模拟精确度较低。为此，提出一种基于ArcGIS的洪水演进三维动态可视化系统。引入ArcGIS进行洪水演进三维动态可视化研究，以二维浅水方程为基础组件，用于干河床的平面二维洪水演进计算模型，使用有限差分法进行离散分析。以ArcGIS为基础平台，组建基于ArcGIS的洪水演进三维动态可视化系统，实现洪水演进计算模拟和可视化的无缝结合。仿真实验结果表明系统能够有效提升洪水演进模拟精确度，同时有效加强系统的稳定性以及运行效率。     

基于Poisson-Nernst-Planck模型的微通道电渗流数值模拟

采用由电解质溶液离子输运Nernst-Planck方程、流体运动Navier-Stokes方程和电场Possion方程建立的Possion-Nernst-Planck模型,应用有限元分析方法研究二维光滑微通道电渗流输运特性和离子分布。对比分别基于Possion-Nernst-Planck模型和Poisson-Boltzmann模型数值模拟结果,结果表明:Possion-Nernst-Planck模型能更准确地模拟计算微通道中的电渗流输运特性和离子分布。     

TDC3000系统和三菱PLC系统之间的通信

0　引言自贡鸿鹤化工厂 5万t/年离子膜烧碱项目引进日本工艺 ,采用 12台电解槽 ,其实际生产能力可达 6万t/年。DCS采用霍尼韦尔公司的TDC30 0 0 ,下挂 2台三菱公司的PLC子系统 ,系统构成如图 1所示 ,其中US为万能工作站。图 1　自贡化工厂 5万t离子膜烧碱工程DCS结构图离子膜工     

Numerical solution of transport equations for plasmas with transport barriers

An approach to solve numerically transport equations for plasmas with spontaneously arising and arbitrarily located transport barriers, regions with a strongly reduced transfer of energy, is proposed. The transport equations are written in a form conserving heat flux and solved numerically by using piecewisely exact analytical solutions of linear differential equations. Compared to standard methods, this approach allows to reduce significantly the number of operations required to obtain a converged solution with a heat conductivity changing abruptly at a critical temperature gradient and to use large time steps in modeling the formation and dynamics of transport barriers. Computations for the tokamak JET are done.     

Computation of Tokamak transport

The complexity of the equations describing the transport phenomena in Tokamaks requires the use of numerical codes for simulation. These codes assume that the plasma is a multifluid medium. They involve equations for the evolution of electrons, light ions and current density, equations for heavy ions (impurities) and elaborate models for the evolution of the neutrals of light atoms. These codes allow testing of the existing theories and deduction of empirical rules and coefficients. After we have presented in more detail the Fontenay-aux-Roses code, we give examples of a few applications of this code.     

Competition of transport flows

Studies are made of the competition of enterprises of passenger transport on intraurban routes. A discrete Markov process is used to describe the process of service of passengers. As a model of the optimization problem, the noncooperative game of n persons is set up, where the solution is taken to be the Nash equilibrium situation.     

SCTP传输性能研究

流控制传输协议SCTP是一种新型的传输层协议,主要用于在IP网上传输PSTN信令。将SCTP与TCP、UDP在一般的网络环境下进行了比较,发现SCTP的传输性能与TCP、UDP的相差甚远;同时将SCTP不同流数下的传输性能进行了比较,发现SCTP的传输性能与传输数据的流数、传输的数据量之间存在关系。基于实验数据,分析了SCTP与TCP、UDP在传输性能方面的差距的可能原因,并提出了相应的解决方法。     

Competition of public transport flows

Consideration was given to operation of the public transport on intraurban routes. Competition between enterprises and the possibility of using cars for conveyance stimulate improvements in the public services. Each enterprise runs a set of routes with the aim of maximizing its revenue by varying the route intervals. The Markov chain was used to model the passenger servicing. Monopoly and coalition-free game of n persons where equilibrium plays the role of solution were considered as the models of the optimization problem. The organizational characteristics of the public transport in the view of the urban interests were studied by way of a numerical example.     

Simulation of cerebrospinal fluid transport

The pulsatile nature of the CSF movement is a result of the cardiac-related pulsations in blood volume in cranial region. According to Monro–Kellie Doctrine, the net inflow of arterial blood during systole is compensated by an equal outflow of venous blood and by caudal displacement of the CSF. Knowledge of the distribution of physical properties (compliance, resistance) along the craniospinal system is crucial for understanding of the CSF hydrodynamics. The synthesis of both invasively and non-invasively obtained data is needed. The aim of our project was to develop a lumped-parameter compartment model of the craniospinal system and, in relation to the cardiac-related blood-volume pulsations, to describe its basic hydrodynamic properties. The model consists of six compartments representing major parts of the craniospinal system. Each compartment has its own set of physical properties which describe its behavior. The pressure transmission from head arteries to the brain compartment serves as a source of pulsations. The simulation tightly mimics pressure waves of the CSF and thus the flow characteristics and magnitudes. The fitted compliance of the spinal compartment in our model was two orders higher (9 × 10⁻¹⁰ m³/Pa) then the cranial compartment (5.2 × 10⁻¹² m³/Pa): only in this adjustment pulsations were present. It makes 99.5% of compliance related to the spinal canal and 0.5% to the intracranial structures. Our fitting showed that this model might be used in medical education as well as in medical practice.     

Sand transport on Mars

Whether the winds of the present Mars are shaping the variety of dune forms observed on the Martian surface has remained an open question that challenged planetary scientists for decades. In order to elucidate this issue, we have studied sand transport and dune formation from two different points of view. The first approach consists of solving the equations of aeolian transport at the level of the particles, whereas we study the trajectories and the velocities of sand grains during Martian wind storms. Next, we adapt a well established continuum model for sand dunes, which successfully reproduces the shape of Earth dunes, in order to study the formation of dunes under atmospheric conditions of Mars. Based on our results, we provide estimates for the wind strength, dune velocity and the timescale of changes in wind directions on Mars.     

Generalized transport vortex method

In this paper, a novel vortex method - generalized transport vortex method is introduced. Being a Lagrangian-Eulerian Approach, this method determines the vorticity field through studying the vortex/circulation’s generalized transport in an artificial velocity (generalized velocity) field of Lagrangian frame. The velocity field is then determined through the use of Poisson’s equation in Eulerian frame. The “generalized transport process” refers the movement and area variation of vortex/circulation, which takes consideration of both diffusion and convection processes. Comparing with traditional vortex-in-cell methods and hybrid vortex methods, it does not use splitting algorithm in math, instead, handle diffusion as a part of the convection process. There is no region decomposition issue in the computation, and its expression is rather simple and easy to realize numerically. Being a numerical application, the present method is used to compute flow past one impulsively started circular cylinder. It is capable of calculating the evolution of the fine structure of the flow field with time precisely.     

Vector transport for shape-from-shading

In this paper we describe a new shape-from-shading method. We show how the parallel transport of surface normals can be used to impose curvature consistency and also to iteratively update surface normal directions so as to improve the brightness error. We commence by showing how to make local estimates of the Hessian matrix from surface normal information. With the local Hessian matrix to hand, we develop an “EM-like” algorithm for updating the surface normal directions. At each image location, parallel transport is applied to the neighbouring surface normals to generate a sample of local surface orientation predictions. From this sample, a local weighted estimate of the image brightness is made. The transported surface normal which gives the brightness prediction which is closest to this value is selected as the revised estimate of surface orientation. The revised surface normals obtained in this way may in turn be used to re-estimate the Hessian matrix, and the process iterated until stability is reached. We experiment with the method on a variety of real world and synthetic data. Here we explore the properties of the fields of surface normals and the height data delivered by the method.     

Stable transport of assemblies by pushing

This paper presents a method to determine whether an assembly of planar parts will stay assembled as it is pushed over a support surface. For a given pushing motion, an assembly is classified into one of three categories: (P = possible): any force necessary to preserve the assembly can be generated by the pushing contacts; (I = impossible): pushing forces cannot preserve the assembly; and (U = undecided): pushing forces may or may not be able to preserve the assembly. This classification is made based on the solution of linear constraint satisfaction problems. If the part-part and part-pusher contacts are frictionless, motions labeled P are guaranteed to preserve the assembly. The results are based on bounds on the possible support friction acting on individual parts in the face of indeterminacy in the distribution of support forces. Experimental results supporting the analysis are given.