基于i.MX35的工程机械显示终端设计

工程机械显示终端是重要的人机交互界面,随着工程机械控制系统信息化和智能化水平的不断提高,对车载显示终端也提出了越来越高的要求。为了满足需求,研制了基于i.MX35的工程机械显示终端,该显示终端以i.MX35多媒体应用处理器为核心,采用CODESYS作为应用编程平台,实现了人机界面显示、CAN总线通信、摄像头视频采集、大容量数据存储等功能,具有显示性能强大、启动速度快、应用编程灵活、易于扩展等特点,可以广泛应用于各种工程机械控制系统中。     

基于加速度响应控制时MTMD的地震特性

研究了由多个刚度和阻尼保持为常量且频率呈线性分布的TMD形成的MTMD的地震特性。基于虚拟激励法和Kanai Tajimi及Clough Penzien地震谱 ,建立了结构 MTMD系统的加速度传递函数 ,进而导出了设置MTMD时结构的加速度动力放大系数 (ADMF)明确表达式。于是MTMD的优化准则选择为 :结构最大加速度动力放大系数的最小值的最小化 [Min .Min .Max .ADMF]。通过最优搜寻得MTMD的最优频率间隔、平均阻尼比、调谐频率比和相应的控制有效性指标。选择结构受控频率与地震卓越频率比的不同取值 ,研究地震卓越频率对MTMD最优参数及有效性的影响     

一种以2~#炸药为主要成份的塑料粘结炸药

2~#炸药[重(,,-三硝基乙基-N硝基)乙二胺]是一个零氧平衡的高能炸药。在2~#炸药中混入少量HMX,以氟橡胶粘结,以TATB、石墨和石腊组成的复合钝感剂来钝感,得到了撞击感度和摩擦感度较低的B-01炸药配方。配方组成为2~#炸药/HMX/TATB/氟橡胶/聚苯乙稀/石墨/石腊=70/22/4/2/0.5/0.5/1。 该配方的特点是冲击波感度很高,很容易用2mm直径的柔爆索起爆。其撞击感度与TNT相当(4％),摩擦感度低于14％,爆轰能量相当于PBX-9404,而且容易在低比压下制成不同形状,因此它适用于某些特殊用途的装药。     

多刚体系统动力学的正则方程及数值解法

本文研究了多刚体系统动力学的正则方程,并由此论证了多刚体系统动力学方程的运动稳定性态.在比较不同数值积分方法的基础上,得出结论:基于正则方程的数值积分方法能较好地保证计算精度.     

Interlayer shear strength of single crystalline graphite

Reported values(0.2 MPa-7.0 GPa) of the interlayer shear strength(ISS) of graphite are very dispersed.The main challenge to obtain a reliable value of the ISS using conventional measuring methods was the unavailability of sufficiently large single crystalline graphite.Here we present a novel experimental method to measure the ISS,and obtain the value as ～0.14 GPa.Our result can serve as an important basis for understanding mechanical behavior of graphite or graphene-based materials.     

Convergence in law to operator fractional Brownian motion of Riemann-Liouville type

In this paper, we extend the well-studied fractional Brownian motion of Riemann-Liouville type to the multivariate case, and the corresponding processes are called operator fractional Brownian motions of Riemann-Liouville type. We also provide two results on approximation to operator fractional Brownian motions of Riemann-Liouville type. The first approximation is based on a Poisson process, and the second one is based on a sequence of I.I.D. random variables.     

Combined effect of modified zeolite 13X and β-nucleating agent on improving β-crystal content and toughening polypropylene random copolymer

Although addition of β-NUCLEATING agent directly into homo-polypropylene(PPH) is a useful method to improve β-CRYSTAL content and toughen PPH, polypropylene random copolymer(PPR) makes this method powerless due to its random structure and low crystallinity. In this study, the-nucleated PPR with high β-CRYSTAL content was prepared by a novel high effective β-NUCLEATING system which consists of-nucleation agent(TMB-5) and modified zeolite 13X(M13X). It was found that M13X and TMB-5 had a synergistic influence on improving β-CRYSTAL content and toughening PPR. The content of β-CRYSTAL in PPR/M13X/TMB-5 was significantly larger than the sum of that in PPR/M13X and PPR/TMB-5. Besides,fracture behavior, phase morphology and relaxation of matrix chain segments were also investigated. The results showed that M13X and TMB-5 improved the mobility of amorphous chain segments at low temperature and contributed to much energy dissipation. This work provides a powerful method to modify PPR.     

基于TMS320DM6467的数字视频综合实验设计

随着网络视频应用的飞速发展,达芬奇技术作为一种新平台逐渐成为数字视频技术应用的发展方向.针对网络视频传输实时性要求高的特点,本文提出了基于达芬奇技术的数字视频综合实验设计方案,TMS320DM6467平台具有ARM+DSP双核处理器,能够提高系统性能,缩短开发周期;DSP内核视频数据编码算法选用H.264,大大提高了数据编码效率;ARM核负责控制视频采集以及实时传输通信,便于学生对数字视频应用前沿技术进行探索.     

具有k个悬挂点的n阶单圈图的第二大谱半径的极图

设G为具有k个悬挂点的n阶单圈图,刘慧清等给出了这类图的最大谱半径的极图,本文得到了当k≥3时具有第二大谱半径的极图.