Optimum Cut of Separating Element as a Function of Total Separation Factor

Calculation of one of the SIMBATH experiments was performed using the SIMMER-II code. The experiments were intended to simulate the fuel pin disintegration, the molten materials relocation and following materials redistribution that could occur during core disruptive accidents assumed in fast breeder reactors. The calculation by SIMMER-II showed that the incorporated step-wise fuel pin disintegration model and the modified particle jamming model were capable of reproducing the course of materials relocation within the identified ranges of the parameters which governed the blockages formation, i.e. the characteristic radius of solid particles jamming and/or sieving out in the flow and the effective particle viscosity. In particular the final materials redistribution calculated by SIMMER-II very well reproduced the experiment. This fact made it possible to interpret theoretically the mechanisms of flow blockages formation and related materials redistribution.     

采煤工作面分源稀释CH_4的供风量计算方法

介绍了分源稀释CH4供风量的计算方法,应用该方法可以计算出采煤工作面的实际配风量及实际绝对瓦斯涌出量,对通风施工具有指导意义。     

磁珠分选原理与分选试验研究

在对磁珠的磁选原理和磁选动力学分析的基础上，得出了磁珠在磁场中所受磁力和从磁选机中分离出磁珠所需磁力的计算公式，给出了不同分选次数和分选工艺的分选效果，得出了采用弱磁场磁选机能够有效回收粉煤灰中磁珠的重要结论。     

气固流化床密度的在线测控研究

在对气固流化床选煤系统被控对象特性分析研究的基础上，提出用逆系统控制方法解决具有非线性多变量特点的气固流化床密度控制问题，建立了相关数学模型，介绍了流化床密度逆控制系统和方法，并获得较好的控制精度。     

Solving method of generalized nonlinear dynamic least squares for data processing in building of digital mine

Data are very important to build the digital mine. Data come from many sources, have different types and temporal states. Relations between one class of data and the other one, or between data and unknown parameters are more nonlinear. The unknown parameters are non-random or random, among which the random parameters often dynamically vary with time. Therefore it is not accurate and reliable to process the data in building the digital mine with the classical least squares method or the method of the common nonlinear least squares. So a generalized nonlinear dynamic least squares method to process data in building the digital mine is put forward. In the meantime, the corresponding mathematical model is also given. The generalized nonlinear least squares problem is more complex than the common nonlinear least squares problem and its solution is more difficultly obtained because the dimensions of data and parameters in the former are bigger. So a new solution model and the method are put forward to solve the generalized nonlinear dynamic least squares problem. In fact, the problem can be converted to two sub-problems, each of which has a single variable. That is to say, a complex problem can be separated and then solved. So the dimension of unknown parameters can be reduced to its half, which simplifies the original high dimensional equations. The method lessens the calculating load and opens up a new way to process the data in building the digital mine, which have more sources, different types and more temporal states.     

螺旋分选机处理煤泥的效果分析

在讨论螺旋分选机理的基础上 ,通过试验证明 :当煤泥粒度在 3～ 0 1mm时 ,可利用螺旋分选法对煤泥进行有效分选 ,但需使用螺旋分级机或小直径的水介旋流器预先脱泥。它可提高精煤的技术经济性 ,提高煤泥中可燃物的回收率     

新兴选煤厂工艺改造

为适应选煤技术的发展,对原有选煤工艺进行技术改造,采用以无压给料三产品重介旋流器为主的重介系统,可提高分选效率,增加经济效益,并使选煤技术达到一个新水平。     

精密气流分级机的研究

本文就高效精密气流分级设备──涡轮分级机分离性能进行研究。讨论涡轮转速、空气流量等对分离精度的影响，导出分割直径动力学方程，利用数值方法计算在边界条件下分割直径的数值解，同时，将理论计算值与实验数据进行了比较。     

局部阻塞管道中湍流的数值预测

本文提出了一个在回流区壁面附近湍流二方程模式的改进方法,并湍流的涡量输运方程及流函数方结合衰减函数的差分格式计算了局部阻塞管道中程,所得到的湍流的时均速度分布与前人的数值结果相比更接近实验结果.     

基于内存交换的网闸系统的研究与实现

物理隔离网闸是一种应用级的安全隔离系统,主要用来解决网络安全所带来的问题。文章重点介绍了一种新的基于内存交换的物理隔离网闸系统的工作原理、主控FPGA芯片的架构以及设备驱动如何控制硬件操作等。主控FPGA芯片采用ATA协议中UDMA 5实现主机间的通信,采用独立控制逻辑设计,还支持CRC校验以保证板间数据可靠传输,CRC校验出错支持数据重传。数据传输率是网闸系统的一个重要技术指标,文章同时分析了数据包长对数据传输率的影响。