应用于网上银行增强型USB Key的设计探讨

针对应用于网上银行的增强型USB Key扩展了RSASSA—PKCS1—v1_5签名机制,并以此为基础提供了增强型USB Key的签名和验签方案。该方案从根本上解决了在原有系统不变的情况下增强型USB Key和原有系统兼容性问题,为银行推广增强型USB Key扫除了技术上的障碍,同时也为其他行业使用增强型USB Key提供了参考。     

An observer-based approach for the projection onto a 2d-curve under movement

Standard path control laws of autonomous vehicles use the shortest distance between the vehicle’s position and the path as a control error. In order to determine this distance, the projection point onto the path needs to be determined continuously. This requires fast algorithms that feature high numerical reliability in the field of vehicle application.This paper presents two different observer-based approaches for the projection problem. The identity observer reconstructs all states of interest for path control. The second one, a reduced observer, only possesses the curve parameter as a state and calculates the other values by algebraic formulas. Both algorithms consider the continuous movement of the vehicle, the run of the curve, and work without any approximation of the curve. Furthermore, they are applicable for arbitrary parameterized smooth curves, guarantee the required numerical stability, have short calculating time, and show good statistical properties. The performance is shown in several simulations as well as under real conditions.     

Variation in gas drainage rate from a coal seam during mining

Gas flow patterns during draining of gas from a coal seam during mining are discussed. The coal seam is treated as a dual medium with both pores and cracks. The seepage, diffusion, and desorption processes are treated using a gas flow equation that describes flow around drill holes. MATLAB is used to solve the differential equations. The permeability tracer test results from a mined coal seam are used to study the variation in gas drainage from a coal seam during mining. The results show that mining can increase the permeability of a coal seam, which then increases the gas drainage. There are inflection points in this variation over time. A close relationship between this variation and the rate of change in coal seam permeability is observed.     

雷达组网系统威力检飞确定采样点数的一种方法

距离取样间隔内采样点数的确定关系到检飞结果的置信度和检飞试验的成本．基于单雷达检飞试验中确定采样点数的思路，提出了雷达组网系统一种威力模式检飞试验确定采样点数的方法．采用全概率公式来确定基于串行合并数据融合的雷达组网系统发现目标次数这一随机变量的分布函数，以此确定合理采样点数．仿真结果表明，该方法可行、有效．     

Dynamic Characteristics of Complex Structure Under and Out of Water

To understand the dynamic characteristics of the whole period of a complex structure‘‘‘‘‘‘‘‘s launching out of water,on the basis of FEM formulations deduced for solving coupled fluid-structure problems with strong-coupled method,FE models used to simulate the structure surrounded with fluid domains are established.The modal ex-periment on the real structure under shallow water shows great sccordance with sinulating results.Based on this verification,dynarnic character parameters of all FE models simulating each phasc of the structure‘‘‘‘‘‘‘‘s launching out of water are abstracted with unsymmetric algorithm,which can comprehensively describe the dynamic characters of the structure in its whole working process.Conclusions drawned from these calculations are successfully applied in works of evaluating the structure‘‘‘‘‘‘‘‘s performances and reliabilities.     

放射敏感性启动子调控CD基因/5-FC自杀系统慢病毒载体的构建及125I诱导表达的研究

合成了含8个CArG元件的放射敏感性启动子E8,将其连接于胞嘧啶脱氨酶（Cytosine Deaminase, CD）基因及GFP报告基因上游,构建了重组慢病毒载体pGC-FU-E8-codA-GFP。与慢病毒包装系统共转染293T细胞包装重组慢病毒颗粒E8-codA-GFP LV,研究重组慢病毒感染EJ细胞在不同剂量¹²⁵I的电离辐射下绿色荧光表达情况及其将5-FC转化为5-FU的能力。结果显示：构建的含有E8启动子及CD基因的重组慢病毒载体,包装的重组慢病毒滴度为2×10⁸TU/mL;经¹²⁵I照射的重组慢病毒感染EJ细胞均可观察到绿色荧光,其细胞上清液均可检测到5-FC转化成的5-FU紫外峰,其中55.5 kBq及74.0 kBq ¹²⁵I照射的细胞组绿色荧光明显,148 kBq ¹²⁵I照射的细胞组,其5-FU紫外峰最为明显。以上结果表明：本工作所构建的放射敏感性启动子调控CD基因/5-FC自杀系统重组慢病毒载体具有电离辐射调控作用,可在¹²⁵I的电离辐射作用下诱导下游基因表达,为放射性核素¹²⁵I联合CD基因/5-FC自杀系统对肿瘤细胞的治疗作用研究提供了实验基础。     

1 000 MW二次再热超超临界机组分散控制系统关键技术研究及应用

在分析二次再热机组控制难点的基础上,介绍了1 000 MW二次再热超超临界机组国产自主化分散控制系统关键技术的研发,包括机组分散控制系统的设计及技术特点,机组协调控制技术,汽温控制技术,旁路控制技术及机组自启停（APS）控制技术。示范工程的应用表明,该分散控制系统性能稳定可靠,各项性能指标达到或优于设计值,机组实现了启停全程控制自动化。     

基于多次数据吸收集合平滑算法的自动油藏历史拟合研究

针对常见历史拟合方法存在计算量大、油藏参数更新异常、油藏模型修正失真等问题.采用集合平滑算法,通过引入集合卡尔曼滤波算法(EnKF)中多次迭代思路,对相同数据重复吸收,推导出多次数据吸收集合平滑算法(ES-MDA)的核心公式,并编写了自动油藏历史拟合软件.以北海布伦特油田海相砂岩油藏为例,将基于ES-MDA算法的油藏自...     

NUMERICAL SIMULATION AND ANALYSIS OF PRESSURE PULSATION IN FRANCIS HYDRAULIC TURBINE WITH AIR ADMISSION

In this article, the three-dimensional unsteady multiphase flow is simulated in the whole passage of Francis hydraulic turbine. The pressure pulsation is predicted and compared with experimental data at positions in the draft tube, in front of runner, guide vanes and at the inlet of the spiral case. The relationship between pressure pulsation in the whole passage and air admission is analyzed. The computational results show: air admission from spindle hole decreases the pressure difference in the horizontal section of draft tube, which in turn decreases the amplitude of low-frequency pressure pulsation in the draft tube; the rotor-stator interaction between the air inlet and the runner increases the blade-frequency pressure pulsation in front of the runner.     

1OO MW汽轮机低压缸通流部分改造

采用三维流场设计方法,在保留原低压缸和主轴的前提下,对某电厂6号100MW汽轮机低压缸通流部分进行了改造。改造后的性能测试表明,低压缸通流效率达到了84.73%,煤耗率降低了18.42g/(kW.h),达到了机组节能降耗预期的效果。