Magnetic properties of electroless-deposited Ni and Ni-NiO core-shell nano-arrays

Ni and Ni-NiO core-shell nano-arrays were fabricated by means of electroless deposition, where the latter was covered by a NiO shell of ∼10 nm by annealing the former at 350 °C for 30 min in an atmospheric condition. HRTEM showed that the NiO shell was developed at the expense of Ni at the array's surface. Ferromagnetic ordering of the Ni-NiO arrays was found to be suppressed compared with those of the less oxidized reference Ni arrays. This is attributed to the screening effect of the NiO shell, and weak ferromagnetism of inner Ni arrays resulted from the development of the NiO. X-ray absorption spectrum reveals that the reference Ni is partially oxidized. Also, X-ray magnetic circular dichroism suggests that the magnetic suppression of the Ni-NiO arrays is associated with a reduced spin moment.     

Circular Chromatic Indices of Regular Graphs

The circular chromatic index of a graph G, written , is the minimum r permitting a function such that whenever e and are adjacent. It is known that for any , there is a 3‐regular simple graph G with . This article proves the following results: Assume is an odd integer. For any , there is an n‐regular simple graph G with . For any , there is an n‐regular multigraph G with .     

《例说循环论证之谬误》注

指出《例说循环论证之谬误》中的第二个例子并非循环论证,并给出例子说明相关问题中更有可能产生循环论证之处。     

用矩阵方程法求解循环卷积的改进算法

从循环卷积的定义出发,描述了用以m为变量的方法求解循环卷积的步骤.特别详述了其中的矩阵方程法,指出了该方法的不足——含有冗余项,提出了矩阵方程法的改进算法,消除了冗余项,简化了矩阵方程,给出了矩阵方程内部各列的构成规律.实例表明该方法简便、有效.     

基于主成分分析的网络搜索数据合成方法研究

针对利用网络搜索数据合成各类指数时难以消除共线性、难以合理确定各指标权重等问题,基于数据降维的思想构建了以主成分分析法为核心的指数合成方法,并以利用网络搜索数据合成消费者物价指数为例,将提出的方法与当前主流的逐步回归法做出比较研究.研究结果表明,基于主成分分析法的数据合成方法可以得到稳定性和拟合度更高的指数.     

基于多传感器的雷达监控网应用技术研究

文中介绍了基于多传感器的雷达监控网应用技术的前景和系统应用流程,详细论述了多级系统架构的数据共享与分发、系统入网的身份认证技术等系统功能开发中的关键技术,并提出了在系统建设中应考虑的问题。     

Radar ambiguity function in Lp frame

In modern radar techniques, pulse signal can be replaced by the chirps, which is taken to be signals in Lp space. Wigner's function and ambiguity functions are constructed in an Lp frame and a partial generalization of the uncertainty principle is given by means of the notion of coherent dual.     

General Synthesis and Physicochemical Characterisation of a Series of Peptide‐Mimic Lysine‐Based Amino‐Functionalised Lipids

A series of novel malonic acid diamides (second generation) with two long hydrophobic alkyl chains and an alkaline polar head group was synthesised and characterised as a new class of amino‐functionalised lipids. These peptide‐mimic lipids are suitable for polynucleotide transfer. The lipids bear a novel backbone consisting of a lysine unit and a malonic acid unit. Six different head‐group structures, which vary in size and number of amino groups that can be protonated, were attached to the backbone structure. Furthermore, different alkyl chains were used to build the lipophilic part (namely tetradecyl, hexadecyl, and oleyl). Phase transitions of the new compounds in aqueous dispersions at pH 10 were analysed and discussed in terms of head group and alkyl chain variations. The shape and size of the formed aggregates of selected lipid dispersions were investigated by dynamic light scattering and transmission electron microscopy.