一种用于计算机间保密通信系统的研究

对一种计算机之间文件在公用电话线路上安全传输系统进了研究，该系统使用YMODEM-BATCH作为文件传输协议，采用以Intel180C96KB单片机作为主处理器的外挂加密设备的方法，解决了公用电话网络上计算机之间文件安全传输的问题，该系统通过国防科工委科学技术部鉴定，效果良好．     

Complexity of Interior Point Methods for a Class of Linear Complementarity Problems Using a Kernel Function with Trigonometric Growth Term

In this paper, we propose a large-update primal-dual interior point method for solving a class of linear complementarity problems based on a new kernel function. The main aspects distinguishing our proposed kernel function from the others are as follows: Firstly, it incorporates a specific trigonometric function in its growth term, and secondly, the corresponding barrier term takes finite values at the boundary of the feasible region. We show that, by resorting to relatively simple techniques, the primal-dual interior point methods designed for a specific class of linear complementarity problems enjoy the so-called best-known iteration complexity for the large-update methods.     

Robust global synchronization of complex networks with neutral-type delayed nodes

In this paper, the problems of robust global exponential synchronization for a class of complex networks with time-varying delayed couplings are considered. Each node in the network is composed of a class of delayed neural networks described by a nonlinear delay differential equation of neutral-type. Since model errors commonly exist in practical applications, the parameter uncertainties are involved in the considered model. Sufficient conditions that ensure the complex networks to be robustly globally exponentially synchronized are obtained by using the Lyapunov functional method and some properties of Kronecker product. An illustrative example is presented to show the effectiveness of the proposed approach.     

基于蒙特卡罗方法的XHA600D医用电子直线加速器的入射电子束参数研究

使用蒙特卡罗方法研究入射电子束参数对XHA600D医用电子直线加速器产生的剂量分布的影响,并确定优化的入射电子束参数。根据厂商提供的XHA600D加速器治疗头的几何、材料参数,使用蒙特卡罗程序EGSnrc对不同的入射电子束参数进行模拟并记录其在水模体中产生的剂量分布,将模拟结果与测量结果进行比较。模拟的入射电子束参数包括平均能量、径向强度分布、角度展宽和能量展宽;实验测量数据包括4 cm×4 cm、10 cm×10 cm、30 cm×30 cm射野条件下的百分深度剂量与离轴剂量。结果表明当入射电子束的平均能量为6 MeV、径向强度的半高宽(Full Width at Half Maximum, FWHM)为0.25 cm、角度展宽为0.15°时,模拟结果和测量结果吻合非常好。这些参数可以作为建立适用于XHA600D加速器的TPS(Treatment Planning System)剂量计算模型的基础参数。     

磺酰脲类除草剂的合成及其除草活性

磺酰脲类除草剂具有用量低,活性高、选择性好、毒性小的优点。为开发和应用此类除草剂,我们合成了在氮原子上连正丁基的8个新的衍生物,并进行了室内药效测定。     

可视化渗透破坏实验装置研发及土力学实践探索

传统土力学实验无法展现土体内部渗透变形,使学生难以直观理解土体渗流的基本原理。利用人工合成透明土材料,融合粒子示踪、断层成像和数字图像处理等技术,研发了可视化渗透破坏实验装置。以砂砾石管涌为例,直观展现了土体渗透破坏孕育–发生–发展–破坏全过程颗粒运移特征,论证了实验装置的可靠性。在此基础上,提出了以学生自主创新为主体,实验技术教研平台、实验课程学习平台和产学合作协同育人平台“三台一体”新的教学模式。

     

Electrocatalytic reduction of coreactant by highly loaded dendrimer-encapsulated palladium nanoparticles for sensitive electrochemiluminescent immunoassay

Dendrimer-encapsulated palladium nanoparticles anchored on a carbon nanohorn were designed as a nonenzymatic tracing tag for sensitive quantum dot-based electrochemiluminescent immunoassay by electrocatalytic reduction of dissolved O(2) as the coreactant.     

手性有机化合物构效关系的量子拓扑学研究

在拓扑化学理论基础上, 从手性分子中成键原子的结构特征和手性原子所处的局部化学微环境出发, 应用密度泛函理论(DFT), 在B3LYP/6-31＋G(d)水平上计算所得距离代替传统二维距离, 结合分子中各原子的支化度, 应用原子的平衡电负性对分子图进行着色, 并引入手性校正因子进行校正, 得到新型的手性拓扑指数w₁和w₂. 采用偏最小二乘回归法建立了18种手性羟基酸和氨基酸的薄层色谱保留指数R_M的定量结构-保留拓扑模型, 并用这种模型对R_M进行预测, 结果表明预测结果和实验值吻合较好. 同时对拓扑模型采用留一交叉检验法(leave-one-out cross-validation, LOO-CV)和外检验相结合的方法进行测试, 测试结果显示模型具有良好稳定性和较强的预测能力.     

Carbon nanospheres enhanced electrochemiluminescence of CdS quantum dots for biosensing of hypoxanthine

This work developed a novel method to greatly enhance the electrochemiluminescence (ECL) of CdS quantum dots (QDs). The ECL amplification was achieved by the assembly of QDs on poly (diallyldimethylammonium chloride)-functionalized carbon nanospheres (PFCNSs), and successfully employed for sensitive ECL biosensing of oxidase substrates. The carbon nanospheres were prepared by a “green” method, and the high loading of QDs on carbon nanospheres led to a 4-times increased ECL intensity with dissolved O₂ as the coreactant. Using xanthine oxidase (XOD) as a model, an ECL biosensor was fabricated by immobilizing the enzyme on the mixing membrane of PFCNSs and QDs. The ECL biosensor showed a fast response to hypoxanthine with a linear concentration range from 2.5 × 10⁻⁸ to 1.4 × 10⁻⁵ M. The limit of detection was 5 nM at a signal-to-noise ratio of 3. The assay results of hypoxanthine in fish samples were in a good agreement with the reference values by amperometric technique. This facile approach to prepare the PFCNSs/QDs system for ECL biosensing could be of promising application in bioanalysis and electronic device.     

Synchronization of stochastic chaotic neural networks with reaction-diffusion terms

In this paper, we are concerned with the synchronization problem of a class of stochastic reaction-diffusion neural networks with time-varying delays and Dirichlet boundary conditions. By using the Lyapunov–Krasovskii functional method, feedback control approach and stochastic analysis technology, delay-dependent synchronization conditions including the information of reaction-diffusion terms are presented, which are expressed in terms of linear matrix inequalities (LMIs). The feedback controllers can be constructed by solving the derived LMIs. Finally, illustrative examples are given to show the effectiveness of the proposed technique.