接口控制文件仿真方法研究

针对装甲车辆复杂的电子信息系统的接口控制文件,若要建立其整个系统的仿真模型,不但周期长,而且分工建立起来的各个模型由于思想方案的不同,会给仿真过程带来很多麻烦,因此采用一种根据接口控制文件自动建立其UML系统模型的方法,通过将自动生成的模型联合详细设计模型一起下载到主仿真机,并联合其它相关工具来完成ICD的自动仿真.结果表明该方法是可行的,不仅很好地解决了仿真过程中ICD数据修改后模型需要重新建立的问题,而且实现了ICD仿真的自动化.     

重型装备车辆汽-10桥通过性评定研究

对重型装备车辆的汽-10公路桥梁通过性的评定方法进行了研究,在试验测量车辆轴距、轴荷的基础上,采用三角形等代荷载方法计算其汽-10桥通过性,给出了可信的评定结果,取得了较好效果,对重型装备车辆的公路桥梁通过性评定具有一定的参考意义.     

冷却结晶法制备不敏感RDX研究

考察了RDX在不同溶剂中的冷却结晶行为,环己酮作为溶剂时得到的晶体品质最高。对RDX在环己酮中冷却结晶过程的研究结果表明,搅拌速率主要影响粒度及其分布,降温速率则决定晶体缺陷数量及体积,搅拌速率为200~400 rpm,降温速率为0.05~0.2 K.min-1时,RDX特性落高最大可提高约70%。     

电子束直写制作低效取样光栅

低效取样光栅是激光取样技术的一种重要元件 ,它可以看成离轴的二相位的菲涅耳波带板。基于菲涅耳波带板的形成原理 ,对取样光栅的变周期环带结构进行了理论分析 ,推导出取样光栅的透过率函数。并在此基础上 ,采用电子束直写加工光栅掩模 ,制作取样光栅。该方法与一般的光学全息方法相比 ,具有设计灵活、重复性好、适于大批量生产等优点。     

Asymmetric anode and cathode extraction structure fast recovery diode

This paper presents an asymmetric anode structure and cathode extraction fast and soft recovery diode.The device anode is partial-heavily doped and partial-lightly doped.The P+ region is introduced into the cathode.Firstly,the characteristics of the diode are simulated and analyzed.Secondly,the diode was fabricated and its characteristics were tested.The experimental results are in good agreement with the simulation results.The results show that,compared with the P-i-N diode,although the forward conduction characteristic of the diode is declined,the reverse recovery peak current is reduced by 47％,the reverse recovery time is shortened by 20％ and the softness factor is doubled.In addition,the breakdown voltage is increased by 10％.     

A Fully Integrated Thin‐Film Inductor and Its Application to a DC‐DC Converter

This paper presents a simple process to integrate thin‐film inductors with a bottom NiFe magnetic core. NiFe thin films with a thickness of 2 to 3 μm were deposited by sputtering. A polyimide buffer layer and shadow mask were used to relax the stress of the NiFe films. The fabricated double spiral thin‐film inductor showed an inductance of 0.49 μH and a Q factor of 4.8 at 8 MHz. The DC‐DC converter with the monolithically integrated thin‐film inductor showed comparable performances to those with sandwiched magnetic layers. We simplified the integration process by eliminating the planarization process for the top magnetic core. The efficiency of the DC‐DC converter with the monolithic thin‐film inductor was 72% when the input voltage and output voltage were 3.5 V and 6 V, respectively, at an operating frequency of 8 MHz.     

A Rigorous 2D Approximation Technique for 3D Waveguide Structures for BPM Calculations

We propose a rigorous 2D approximation technique for the 3D waveguide structures; it can minimize the well‐known approximation errors of the commonly used effective index method. The main concept of the proposed technique is to compensate for the effective cladding index in the equivalent slab model of the original channel waveguide from the modal effective index calculated by the nonuniform 2D finite difference method. With simulations, we used the proposed technique to calculate the coupling characteristics of a directional coupler by the 2D beam propagation method, and the results were almost exactly the same as the results calculated by the 3D beam propagation method.     

Monitoring Data Management Information System for Securities Market

The quadrature amplitude modulation (QAM) is the basic technology on high speed broadband communication physical level symbol mapping. Systems requiring lower signal to noise ratio to achieve the same error probability are more power-efficient. The usage of high order modulation is limited due to its low power efficiency compared to lower order modulation. This paper combines the characteristics of Gray code symbol mapping for QAM constellation to design a soft decision algorithm based on signal diversity (div-log-MAP). The bottle-neck of the low power efficiency is overcome and highest power efficiency can be realized. The performance of div-log-MAP can beyond the performance of log maximum a posteriori probability algorithm. At the same time, the proposed algorithm is a more effective method to utilize high order QAM modulation on high speed broadband communication.     

C-Shaped Cartilage Development Using Wharton's Jelly-Derived Hydrogels to Assemble a Highly Biomimetic Neotrachea for use in Circumferential Tracheal Reconstruction

A highly biomimetic neotrachea with C-shaped cartilage rings has promising clinical applications in the treatment of circumferential tracheal defects (CTDs) owing to its structure and physiological function. However, to date, most fabricated tracheal cartilages are O-shaped. In this study, finite element analysis demonstrates C-shaped cartilage rings that exhibit better compliance than O-shaped. Hydrogel is developed using methacryloyl-modified decellularized Wharton's jelly matrix (DWJMA) for the regeneration of C-shaped cartilage rings. This novel hydrogel possesses adjustable physicochemical properties and favorable cytocompatibility. When loaded with chondrocytes, DWJMA hydrogels support the optimal cartilage regeneration both in vitro and in vivo. More importantly, a highly biomimetic neotrachea simultaneously simulating the structural and physiological properties of the normal trachea is regenerated via modular assembly of several individual C-shaped cartilage rings. The results demonstrate the highly biomimetic neotrachea have better patency (88.6 ± 6.1% vs 74.4 ± 9.4%, p < 0.05), improve the survival rate, alleviate weight loss and mucoid impaction, than its O-shaped counterpart when used for the treatment of CTDs in a rabbit model. Therefore, this study proposes a novel hydrogel for the regeneration of C-shaped cartilage and provides new insights into the treatment of CTDs using a highly biomimetic neotrachea with C-shaped cartilage rings.