有(17,3,1)型的二元自对偶编码[52,26,10]

通过对二元自对偶编码进行分类,证明了在等价情况下,有17阶自同构的二元自对偶编码[52,26,10]只有一种。     

三元域上三次和四次剩余码的幂等生成元

有限域上高次剩余码的生成多项式都是多项式[xn-1]的因式。针对多项式[xn-1]在有限域上分解的困难性,给出了三元域[F3]上三次和四次剩余码的幂等生成元表达式。利用计算机软件求解这些幂等生成元与[xn-1]最大公因式就可得到三次和四次剩余码生成多项式而不用分解[xn-1]。     

On switching equivalence of <Emphasis Type="Italic">n</Emphasis>-ary quasigroups of order 4 and perfect binary codes

We prove that arbitrary n-ary quasigroups of order 4 can be transformed into each other by successive switchings of {a, b}-components. We prove that perfect (closely packed) binary codes with distance 3 whose rank (dimension of the linear span) is greater by 1 or 2 than the rank of a linear perfect code can be taken to each other by successive switchings of i-components.     

硅苯、1-硅萘及9-硅蒽的[4+4]二聚反应的比较研究

采用密度泛函理论(DFT)在B3LYP/6-31G(d)水平上,研究硅苯、1-硅萘及9-硅蒽的[4+4]二聚反应的微观机理和势能剖面,考察了反应的取代基效应和溶剂效应.计算结果表明,所研究反应均为协同反应,且2个C-Si键同步形成.随反应物分子芳香环从小到大的增加,[4+4]反应在热力学和动力学上均变得越来越有利.硅苯...     

A comment on "On equilibria, stability, and instability of Hopfield neural networks" [and reply]

It is pointed out that the main analysis results about the existence, uniqueness, and global asymptotic stability of the equilibrium of a continuous-time Hopfield type neural network given in the paper by Zhi-Hong Guan et al. (2000) are special cases of relevant ones previously obtained in the literature. In reply the original authors consider the reasoning of Xue-Bin Liang's comments and state that their analysis method is in fact different to existing ones.     

基于物联网技术的智慧实验室近远程测控系统

针对物联网教学中理论实验管理一体化的趋势,提出一种基于物联网技术的智慧实验室近远程测控系统方案。方案中设计了一种可将理论教学、实验自学、安全管理三位一体化的智慧实验室测控系统结构,通过融合无线传感网、嵌入式网关、网络通信、数据库等多种物联网相关技术,实现了一个可实时近远程访问教学、实验测试、设备控制、维护管理的物联网智慧实验室测控系统。测试证明,该系统可良好实时地运用于理论实验管理一体化教学中,分别满足教师端、学生端、实验师端三方的教学、自学和管理需求,促进在线离线教育方式融合,为智慧课堂教学提供良好平台。     

配合物{Cu[PHBA]2(H2O)3}(H2O)3的水热合成、晶体结构、电化学分析及量化计算

在甲醇和水的混合溶剂中通过水热反应,以对羟基苯甲酸和4,4′-联吡啶为配体合成了配合物{Cu[PHBA]_2(H_2O)_3} (H_2O)_3,并测定了配合物的晶体结构,该晶体属三斜晶系,空间群c2(1),晶胞参数为:a=2.4428(5)nm,b=1.14476(17)nm,c=0.72516(11)nm,α=β=γ=90.00°,V=2.0278(6)nm~3,Dc=1.578g/cm~3,Z=4,F(000)=1004。最终偏离因子R_1= 0.0304,wR_2=0.0796。配合物中Cu(Ⅱ)离子与2个对羟基苯甲酸的2个羧基O原子及3个水分子中的3个氧原子配位,形成三角双锥结构,铜位于结构中心。结合晶体结构对配合物进行了电化学性质分析和量子化学计算。     

Robotics: State of the Art and Future Challenges (G. Bekey, et al; 2008) [On the Shelf]

This book presents the results of an assessment of the state of robotics in Japan, South Korea, Western Europe, and Australia and a comparison of robotics R&A in these countries with those in the United States.     

An approximation approach of the clothoid curve defined in the interval [0, π/2] and its offset by free-form curves

We propose an algorithm to approximate the clothoid curve defined in the interval [0, π/2] and its offset curves with Bézier curves and the approximation errors converge to zero as the degree of the Bézier curves is increased. Secondly, we discuss how to approximate the clothoid curve by B-spline curves of low degrees. By employing our method, the clothoid curve and its offset can be efficiently incorporated into CAD/CAM systems, which are important for the development of 3D civil engineering CAD systems, especially for 3D highway road design systems. The proposed method has been implemented on AutoCAD R14.     

N-[(Z)-2-氰基亚胺-1，3-噻唑-3-基]-4-溴苯甲酰胺的合成、晶体结构及量子化学计算

含噻唑(噻唑烷)杂环的化合物具有广谱的抑菌、杀虫,抗癌、抗肿瘤等活性,因此设计合成含噻唑(噻唑烷)杂环的新化合物成为当今药物设计合成的热点。鉴于此,本研究以(Z)-2-氰基亚胺-1,3-噻唑烷和4-溴苯甲酰氯为原料,在丙酮和三乙胺体系中合成了标题化合物,采用IR、1H NMR分析方法对其进行了表征。并采用x射线衍射(XRD)测定了其晶体结构,为单斜晶系,P21/c空间群,晶胞参数：a=16.579(3)(A),b=5.6471(11)(A),c=13.611(3)(A);α=90°,β=112.91(3)°,γ=90°,Z=4,Mr=310.17,Dc=1.755 Mg/m3,F(000)=616,μ=3.67mm-1,R1=0.037,ωR2=0.108。接着采用量子化学理论,在DFT-B3LYP/6-311G(d,p)基组下计算了该化合物的优化结构参数、电荷分布、分子总能量及前线轨道能量,为标题化合物的深入研究提供了理论依据。