网络疑似入侵环境下的最优接口访问控制模型仿真

在网络疑似入侵环境下通过最优接口访问控制实现网络入侵的可靠性拦截,保障网络安全。传统方法采用自由链路分散控制模型进行网络入侵检测和接口访问控制,在受到较大的特征干扰下,入侵访问控制和拦截性能不好。提出一种基于自适应循环堆栈接口调度的网络疑似入侵环境下的最优接口访问控制模型。进行接口访问控制模型总体设计及组件模块分析,接口访问控制系统包括通信库、协议库、核心控制库和资源库,采用小波包自适应波束调制方法进行入侵检测算法设计,作为接口访问控制系统软件核心。通过SDICmdCon寄存器设置网络疑似入侵环境下的最优接口的内核,在嵌入式Linux环境下通过自适应循环堆栈接口调度实现接口访问控制的软件开发。仿真结果表明,采用该模型进行网络入侵检测,准确检测性能较好,通过最优接口访问控制,实现对网络入侵数据的准确识别和拦截。     

在线超临界流体色谱联用技术测定超临界二氧化碳中芘溶解度

设计了一种单阀外循环接口,采用静态溶解度测定方法,联用在线超临界流体色谱,准确测定了芘在超临界二氧化碳中的溶解度.通过釜内磁力搅拌和接口外循环的双重作用,促进芘在超临界二氧化碳中的溶解平衡过程,确保在测定芘溶解度时体系已达到溶解平衡状态,确定了溶解平衡时间,消除了联用体系中因芘的溶解度过高而产生的体系堵塞问题.     

Interface evolution of a particle in a supersaturated solution affected by a far-field uniform flow

The effect of far-field uniform flow on the morphological evolution of a spherical particle in a supersaturated solution affected by a far-field uniform flow is studied by using the matched asymptotic expansion method. The analytical solution for the interface shape, concentration field, and interface velocity of the particle growth shows that the convection induced by the far-field uniform flow facilitates the growth of the spherical particle, the upstream flow imposed on the particle enhances the growth velocity of the interface when the flow comes in, the downstream flow lowers the growth velocity of the surface when the flow goes out, and the interface morphology evolves into a peach-like shape.     

Pits and adatoms at the interface of 1-ML C84/Ag （111）

We prepare a well-defined C84 monolayer on the surface of Ag （111） and study the geometric structure by scanning tunneling microscopy （STM）. The C84 molecules form a nearly close-packed incommensurate R30° lattice. The lattice is long-distance ordered with numerous local disorders. The monolayer exhibits complex bright/dim contrast; the largest height difference between the molecules can be greater than 0.4 nm. Annealing the monolayer at 380 ℃ can desorb part of the molecules, but more than sixty percent molecules stay on the Ag （111） surface even after the sample has been annealed at 650 ℃. Our analyses reveal that the 7-atom pits form beneath many molecules. Some other molecules sit at the 1-atom pits. Ag adatoms （those removed substrate atoms, accompanying the pit formation） play a very important role in this system. The adatoms can either stabilize or destabilize the monolayer, depending on the distribution manner of the adatoms at the interface. The distribution manner is determined by the co-play of the following factors： the dimension of the interstitial regions of the C84 overlayer, the number of the adatoms, and the long-distance migration of part adatoms.     

SIMULATION OF THE INTERFACED STRUCTURAL COMPONENT BASED ON A MULTIPLE-TIME-SCALE ALGORITHM

A multiple-time-scale algorithm is developed to numerically simulate certain structural components in civil structures where local defects inevitably exist. Spatially, the size of local defects is relatively small compared to the structural scale. Different length scales should be adopted considering the efficiency and computational cost. In the principle of physics, different length scales are stipulated to correspond to different time scales. This concept lays the foundation of the framework for this multiple-time-scale algorithm. A multiple-time-scale algorithm, which involves different time steps for different regions, while enforcing the compatibility of displacement, force and stress fields across the interface, is proposed. Furthermore, a defected beam component is studied as a numerical sample. The structural component is divided into two regions： a coarse one and a fine one; a micro-defect exists in the fine region and the finite element sizes of the two regions are diametrically different. Correspondingly, two different time steps are adopted. With dynamic load applied to the beam, stress and displacement distribution of the defected beam is investigated from the global and local perspectives. The numerical sample reflects that the proposed algorithm is physically rational and computationally efficient in the potential damage simulation of civil structures.     

“一站式”远程开放实验平台的设计与实现

"一站式"远程开放实验平台需要集成和整合分别多个来自不同厂商的实践教学软件,而不同的实践教学软件又有各自不同的用户系统与管理平台.针对这一情况,阐述了"一站式"远程开放实验平台的设计思路,并论述了"一站式"远程开放实验平台通过单点登录解决跨平台接口技术,通过Web Service方法实现平台对实践教学软件的数据的采集以及平台的权限设计与实现等关键技术.     

Interface-related switching behaviors of amorphous Pr0.67Sr0.33MnO3-based memory cells

The resistive switching properties in amorphous Pr0.67Sr0.33MnO3 films deposited by pulsed laser deposition are investigated.Reproducible and bipolar counter-8-shape and 8-shape switching behaviours of Au/Pr0.67Sr0.33MnO3 /F：SnO2 junctions are obtained at room temperature.Dramatically,the coexistence of two switching polarities could be reversibly adjusted by an applied voltage range.The results allocated those two switching types to areas of different defect densities beneath the same electrode.The migration of oxygen vacancies and the trapping effect of electrons under an applied electric field play an important role.An interface-effect-related resistance switching is proposed in an amorphous Pr0.67Sr0.33MnO3-based memory cell.     

Electric Field Control of Interface Related Spin Splitting in Step Quantum Wells

Spin splitting of the Aly Ga1-y As/GaAs/A1x Ga1-x As/A1-y Ga1-y As （x ≠ y） step quantum wells （ Q Ws） has been theoretically investigated with a model that includes both the interface and the external electric field contribution. The overall spin splitting is mainly determined by the interface contribution, which can be well manipulated by the external electric field. In the absence of the electric field, the Rashba effect exists due to the internal structure inversion asymmetry （SIA）. The electric field can strengthen or suppress the internal SIA, resulting in an increase or decrease of the spin splitting. The step QW, which results in large spin splitting, has advantages in applications to spintronic devices compared with symmetrical and asymmetrical QWs. Due to the special structure design, the spin splitting does not change with the external electric field.     

二维液相色谱切换技术及其应用

多维液相色谱已成为复杂样品研究的重要工具。本文在介绍多维液相色谱原理与方法的基础上,重点讨论了二维液相色谱接口切换技术的近期发展,并对其应用现状进行了总结分析。     

基于MIPI标准下的D-PHY的设计与验证

目前大部分移动设备均使用MIPI接口,主要是MIPI接口可以实现高速数据传输,同时不会造成功耗的损失过大。为了理解MIPI接口的工作原理,通过对D-PHY芯片设计和研究,阐述MIPI实现低功耗模式和高速模式传输数据的原理。对D-PHY芯片的设计,采用40nm的CMOS工艺为基础,实现以500MHz的速率来传输数据,功耗损失仅在0.74mW左右。