MilCAN总线同步及调度配置方法

MilCAN作为一种以陆军地面武器平台应用为目标的CAN高层协议,核心是通过时序控制保证总线通信的实时性和确定性;为了增强MilCAN总线通信时序控制,提出一种新的MilCAN总线同步和调度配置方法;采用STM32微控制器对MilCAN总线主控节点进行设计,将总线同步和总线调度配置任务集成至专用的主控节点进行,同时开展了总线通信测试;测试结果表明：以该方法设计的MilCAN总线主控节点可有效完成同步和总线调度配置任务,同步精度较高,性能稳定可靠。     

Synthesis,structure and DNA-binding studies of tetranuclear copper(II) complexes bridged by asymmetrical<Emphasis Type="Italic"> N</Emphasis>,<Emphasis Type="Italic">N′</Emphasis>-bis(substituted)oxamides

Two tetranuclear copper(II) complexes bridged by asymmetrical N,N′-bis(substituted)oxamides have been synthesized and characterized as [Cu₄(dmapob)₂(Me₂bpy)₂](pic)₂·6H₂O (1) and [Cu₄(oxbe)₂(dabt)₂](pic)₂ (2), where H₃dmapob and H₃oxbe denote N-benzoato-N′-[3-(dimethylamino)propyl]oxamido and N-benzoato-N′-(2-aminoethyl)oxamide, respectively; and Me₂bpy, dabt, and pic represent 4,4′-dimethyl-2,2′-bipyridine 2,2′-diamino-4,4′-bithiazole, and 2,4,6-trinitrophenol, respectively. Complex 1 was characterized by elemental analyses, IR and electronic spectra, and single-crystal X-ray diffraction. Its structure consists of two asymmetrical binuclear copper(II) units linked by carboxyl bridges into a circular tetranuclear copper(II) complex with an embedded center of inversion. The copper(II) centers are in square-planar and distorted square-pyramidal environments. Hydrogen bonds and aromatic stacking interactions link the tetranuclear copper(II) fragments into a 3D supramolecular structure. The interactions of complexes 1 and 2 with herring sperm DNA (HS-DNA) were investigated by electronic and fluorescence spectra and viscosity measurements. Both complexes bind to HS-DNA via the intercalative mode, and complex 2 displays a significant binding propensity to HS-DNA.     

反相高效液相色谱法分析三羟乙基胺硬脂酸酯

提出了反相高效液相色谱法测定三羟乙基胺硬脂酸酯中单硬脂酸酯、双硬脂酸酯、三硬脂酸酯的含量。以C18硅胶键合柱(250 mm×4.6 mm,5μm)为分离柱,甲醇与氯仿混合溶液为流动相梯度淋洗,用电雾式检测器检测。三羟乙基胺单、双、三硬脂酸酯的线性范围分别为2.0～50.0,1.0～50.0,1.2～50.0 mg.L-1,方法的检出限(3S/N)分别为1.8,0.5,1.0 mg.L-1。     

Pd/MWCNTs(多壁碳纳米管)催化剂的制备及其Heck反应催化活性

以浓硝酸处理后的多壁碳纳米管(MWCNTs)为载体,通过微波辅助法简单而快速地制备了高度分散、粒径均一的Pd/MWCNTs催化剂。利用XRD、HRTEM、XPS等手段对催化剂进行了表征。考察了Pd/MWCNTs催化剂对Heck反应的催化活性,并优化了反应温度、碱的种类和用量等反应条件。结果表明,Pd/MWCNTs在Heck反应中具有良好的催化活性。     

冷原子荧光光谱法测定南宁市邕江支流水域中无机汞和总汞

采用氢化物发生-冷原子荧光光谱法,测定了南宁邕江支流水域中无机汞和总汞.实验结果表明,南宁邕江支流水域中汞含量均小于国家规定的地表水Ⅰ类水域的标准,水质良好.同时对样品的测量检出限及方法回收率进行实验,结果表明在优化的实验条件下检出限为0.021 ng/L,相对标准偏差为2.24％,无机汞和总汞的加标回收率分别为90....     

Density functional theory study of the mechanism of the acid-catalyzed decarboxylation of pyrrole-2-carboxylic acid and mesitoic acid

The mechanisms of the acid-catalyzed decarboxylation of pyrrole-2-carboxylic acid and mesitoic acid have been investigated based on density functional theory calculations at the B3LYP/6-311G (d,p) level. A polarizable continuum model (PCM) has been established in order to evaluate the effects of solvents on these reactions. The results of the calculations indicate that the first step of the acid-catalyzed decarboxylation of the pyrrole-2-carboxylic acid has two possible pathways,that is,the proton of H3O+ a...     

Theoretical research of multiphoton transition of HF in static electric and laser fields

A ‘modulated potential model’ is presented to describe the potential of diatomic molecules in static electric fields, and investigate the static electric effect on the multiphoton process. The multiphoton transition of HF in static electric and intense laser fields has been investigated using the Lie algebra approach. Multiphoton transition information is obtained by solving the time-evolution operator. This method makes the solving of the Schrödinger equation easier and makes the computation time shorter.     

复合腔CuBr激光器中的模式研究

本文报道了在两种结构的多镜复合腔中CuBr激光器的纵模淬灭现象,并得到了重复频率几倍于基频纵模间隔的多重锁模脉冲串,最高重复频率可达440MHz.实验结果表明,通过调整复合腔的结构参数,可以在不缩短增益介质长度的条件下,实现CuBr激光多重锁模脉冲高重复频率的大范围调节.     

非自治 Hamilton 系统多重周期解的存在性

一、引言和主要结果在临界点理论中,我们知道如果具有变分结构的方程含有某种对称性,则对应的泛函在相应的群(例如 Z_2或 S~1)作用下是不变的.这种泛函常常具有多重临界点甚至无穷多个临界点,对应的方程同时具有多重解.令人感兴趣的问题是如果这种对称性被扰动,在什么条件下多重解的性质仍能保持?这类问题对于半线性椭圆型方程,半线性波动方程以及Hamilton 系统已有了若干重要的结果,也已提出了许多保证无穷多解存在性的充分性条件.但这些结果都只考虑具有某种对称性的主要非线性项是超线性时的情形,而对称扰动项或是自由项或其增长阶低于对称项的增长阶.一个自然的问题是能否提出另外一类保证无穷多解存在性的充分条件.例如对称项的增长阶低于扰动项的增长阶?本文将部     

具有临界增长的p-双调和方程非平凡解的存在性

本文在有界区域Ω(С)RN中讨论p-双调和方程△(a(x)|△u|p-2△u)=f(x,u)的Dirichlet零边值问题,给出了在一般的临界增长条件下非平凡W2,p O(Ω)解的存在性.