Self-Dual Permutation Codes over Finite Chain Rings

Permutation codes over finite chain rings are introduced; by using the character of the finite chain rings and the knowledge of representation of group, some conditions for existence or non-existence of self-dual permutation codes over finite chain rings are obtained. Specially, when the group is a direct product of a 2-group and a T-group, and the group action is transitive, the sufficient and necessary condition of the existence of permutation codes is given.

The maximal size of 6-and 7-arcs in projective Hjelmslev planes over chain rings of order 9 Dedicated to Professor Feng Keqin on the Occasion of his 70th Birthday

We complete the determination of the maximum sizes of （k,n）-arcs, n ≤ 12, in the projective gjelmslev planes over the two （proper） chain rings Z9 = Z/9Z and S3 = F3[X]/（X2） of order 9 by resolving the hitherto open cases n = 6 and n = 7. Parts of our proofs rely on decidedly geometric properties of the planes such as Desargues＇ theorem and the existence of certain subplanes.

Notes on Linear Codes over Finite Commutative Chain Rings

The properties of the generator matrix are given for linear codes over finite commutative chain rings, and the so-called almost-MDS （AMDS） codes are studied.

Octa-membered Water Ring Chain Based on Sulfonic Group in Ni(II) Complex with 2-[(E)-(2-Oxidophenyl)methyleneamino] Ethanesulfonato and 2,2′-Bipyridinyl

The title compound, [Ni（tssb）（2,2-bipy）2].5（H2O） 1 （tssbH2 =2-[（E）-（2-oxido- phenyl）methyleneamino]ethanesulfonato, 2,2-bipy = 2,2＇-bipyridinyl）, belongs to orthorhombic, space group Pbcn with a = 20.3983（18）, b = 17.6929（15）, c = 17.0897（15） nm, V= 6167.8（9） nm^3, Mr= 688.38, Z = 8, De = 1.481 g.cm^-3, F（000） = 2880,μ = 0.758 mm-1 and S =1.099. Each NiIr atom is six-coordinated by one N and one O atoms from one tssb^2- anion and four N atoms from two 2,2-bipy ligands to give a distorted octahedral geometry. Noticeably, there exists a rare octa-mem- bered water ring which presents a 1D chain by sulfonic group.

Spin transport in a chain of polygonal quantum rings with Dresselhaus spin-orbit coupling

Using a transfer matrix method, we investigate spin transport through a chain of polygonal rings with Dresselhaus spin-orbit coupling（DSOC）. The spin conductance is dependent on the number of sides in the polygons. When DSOC is considered in a chain which also has Rashba spin-orbit coupling（RSOC） of the same magnitude, the total conductance is the same as that for the same chain with no SOC. However, when the two types of SOC have different values, there results a unique anisotropic conductance.

Phase behaviour of polyethylene knotted ring chains

The phase behaviour of polyethylene knotted ring chains is investigated by using molecular dynamics simulations. In this paper, we focus on the collapse of the polyethylene knotted ring chain, and also present the results of linear and ring chains for comparison. At high temperatures, a fully extensive knot structure is observed. The mean-square radius of gyration per bond （S2）/（Nb2） and the shape factor （（δ＊） depend on not only the chain length but also the knot type. With temperature decreasing, chain collapse is observed, and the collapse temperature decreases with the chain length increasing. The actual collapse transition can be determined by the specific heat capacity Cv, and the knotted ring chain undergoes gas-liquid-solid-like transition directly. The phase transition of a knotted ring chain is only one-stage collapse, which is different from the polyethylene linear and ring chains. This investigation can provide some insights into the statistical properties of knotted polymer chains.

Synchronization of N different coupled chaotic systems with ring and chain connections

Synchronization of N different coupled chaotic systems with ring and chain connections is investigated. The New system, the Chen system, the Lii system, the Lorenz system, and the Rossler system are used as examples in verifying effectiveness of the method. Based on the Lyapunov stability theory, the form of the controller is designed and the area of the coupling coefficients is determined. Simulations indicate that global synchronization of the N different chaotic systems can be realized by choosing appropriate coupling coefficients by using the controller.

Two New Chlorovanadates:Ba_8Cs_5V_8O_(24)Cl_(13)with[V_8O_(24)]Ring and MgCsV_2O_6Cl with[VO_3]_∞Chain

Two new crystals of chlorovanadates,Ba_8Cs_5V_8O_（24）Cl_（13）（1） and MgCsV_2O_6Cl（2）,were grown in the molten salt media. 1 crystallizes in tetragonal,space group P4/mmm（No. 123）,with a = 14.801（2）,c = 12.341（3） ？,V = 2703.5（8） ？~3,Z = 2,Mr = 3015.56,F（000） = 2640,μ = 11.044 mm-1,Dc = 3.704 g/cm3,the final R = 0.0380 and wR = 0.0937 for 1654 observed reflections with I 〉 2σ（I）. 2 crystallizes in a monoclinic space group C2/c（No. 15） with a = 11.128（2）,b = 10.540（2）,c = 6.9892（14） ？,β = 118.38（3）°,V = 721.2（2） ？~3,Z = 4,M_r = 390.55,F（000） = 712,μ = 7.997 mm-1,D_c = 3.597 g/cm^3,the final R = 0.0537 and w R = 0.1363 for 740 observed reflections with I 〉 2σ（I）. 1 exhibits a novel 8-membered-ring [V_8O_（24）] consisting of 8 corner-shared VO_4 tetrahetra,but in 2,an infinite ladder-like [VO_3]_∞ chain is formed by VO_5 square pyramids through sharing the edges.

CYCLIC CODES OVER FORMAL POWER SERIES RINGS

In this article, cyclic codes and negacyclic codes over formal power series rings are studied. The structure of cyclic codes over this class of rings is given, and the relationship between these codes and cyclic codes over finite chain rings is obtained. Using an isomorphism between cyclic and negacyclic codes over formal power series rings, the structure of negacyclic codes over the formal power series rings is obtained.

On Left A-Injective Rings

The main results of this paper are following theorems: (1)A left A-injective ring satisfying the ascending chain condition on right annihilator is QF ring. (2)A left A-injective ring satisfying the ascending hain condition on left annihilator is QF ring. (3)If R satisfies the following conditions: (ⅰ) r(A∩B)=r(A)+r(B), for each pair of left ils A,B;(ⅱ) rl(I)=I, for every right ideal I. Then R is semiperfect ring and has essential left s. In particular, any right CF left A-injective (or E(_RR) is projective left R-module) is QF ring

ON THE CHARACTERIZATION OF CYCLIC CODES OVER TWO CLASSES OF RINGS

Let R be a finite chain ring with maximal ideal （7） and residue field F,and letγ be of nilpotency index t. To every code C of length n over R, a tower of codes C = （C ： γ0） C_ （C： 7） C ... C_ （C： γ2） C_ .-. C_ （C：γ^t-1） can be associated with C, where for any r C R, （C ： r） = {e C Rn I re E C}. Using generator elements of the projection of such a tower of codes to the residue field F, we characterize cyclic codes over R. This characterization turns the condition for codes over R to be cyclic into one for codes over the residue field F. Furthermore, we obtain a characterization of cyclic codes over the formal power series ring of a finite chain ring.

Catalytic Ring Opening of Perhydroindan-Hydrogenolytic and Cationic Reaction Paths

Perhydroindan ( bicyclo [ 4.3.0 ] nonane )在六不同催化剂上在 5 MPa 的一个氢压力下面在一台流动类型仪器被变换，也就是在 bifunctional Pd/Na 上，H贝它沸石在 Ir/Na ， H-Y 和 Pt/Na 上，有 Br 的低集中的 H-Y 沸石? nsted 酸地点，并且在非酸的支持硅石上在三催化剂上包含三高贵金属。在 bifunctional 沸石 Pd/Na 上， H 贝它， perhydroindan 的骨胳的异构化是一枚 naphthenic 戒指开跟随的主要反应，在 ca 的低收益的开链的 nonanes 的形成。6% ，并且 hydrocracked 产品 C8- 。后者的碳数字分发没有与一枚 naphthenic 戒指显示 C9 先锋的 carbocationic 氢化裂解的 C1， C2， C7，和 C8 是塑造火山的。在 Ir/Na 上，到 C8- 的 H-Y 和 Pt/Na， H-Y (高效的戒指洞催化剂) ，戒指洞和氢化裂解在各自的金属上由 hydrogenolysis 发生了。五成员的戒指开比六成员的戒指开被发现快得多，与文学报告一致。开链的 nonanes (OCN ) 的最大的选择在 Ir/Na， H-Y 和 Pt/Na 上到达了， H-Y 很高， viz。分别地， 49% 和 54% 更好与是的 decalin 以前观察的开链的 decanes 比那些为烃建模。在 Pt/Na 上形成的 OCN， H-Y 更不比在 Ir/Na 上形成的那些被分叉，在两金属上以不同 hydrogenolysis 机制被解释的 H-Y。珍贵辅助机械学的信息在硅石上在三高贵金属上从 perhydroindan hydroconversion 的选择被获得。与 Pd/silica 相对照，红外 / 硅石和磅 / 硅石也给了 OCN 的可估计的选择，还这些选择的最大的价值比在二高效的沸石催化剂上获得的那些低。

ON STRONGLY REGULAR RINGS

?The multiplication semigroup of strongly regular ring R in the light of semigroup is researched,hence some properties of strongly regular rings are obtained. The non-division strongly regular ring R is anilpotent semisimple ring without identity element. It is neither the Artin ring nor the Noether ring. The setidempotents of ring R is an infinite set without the maximum and minimal conditions,it is a unions of someorder sets and hai a non-well-ordered order set at least.

“链-回-环”系统能质平衡核算及优化

文章以某球团厂200万t“链—回—环”系统为例,根据现场采集到的生产数据,核算得到该系统的热利用率为22.36%,余热回收率为71.62%。优化后得到当喷煤量在5.00~5.40 t/h,煤粉固定碳含量在76%~82%,煤粉燃尽率在97.5%以上时,预热Ⅱ段氧含量可以稳定在14.0%~16.0%,有利于球团矿的氧化且能有效抑制氮氧化物的生成。

链箅机—回转窑—环冷机球团系统热经济性分析

以降低球团生产系统能耗为目标,进一步了解球团生产过程中能流及[火用]流的变化和损失情况,对链箅机—回转窑—环冷机氧化焙烧球团系统进行了热平衡及[火用]平衡计算分析。系统热收入和[火用]收入主要项为燃料化学能和球团氧化。热量消耗主要用于排出废热和外表面散热。传热、燃烧不可逆[火用]损失和系统机体散热[火用]损失为[火用]支出主要部分。针对系统废热余热资源未完全利用情况,提出环冷废气余热循环利用和回转窑表面散热回收等建议,经计算优化后,对于废气余热循环,利用环冷二段与三段废气余热使热效率提高至85.29%、[火用]效率提高至33.40%;回收集热器余热使热效率提高至86.53%、[火用]效率提高至33.93%。研究结果为球团生产提供建议,并结合实际寻找适合该系统的余热利用方案,为节能优化提供参考。

刮板输送机链环在不同磨料条件下的耐磨性研究

为了解决刮板输送机在输运煤料的过程中,刮板链系统会产生三体磨损导致链环磨损失效的问题。采用磨料磨损试验机进行磨料磨损试验,通过正交试验以及单因素试验分析了三种刮板输送机链环材料(YXKB2钢、54钢、25MnVK钢)在不同因素(磨料配比、磨粒粒度、链环材料硬度)下的磨损特性及耐磨性能。试验结果表明:磨料配比对材料磨损量的影响最为显著,磨料配比与磨料粒度耦合作用次之。在等质量磨料条件下,YXKB2钢的磨损量随磨料粒度的增大而下降,但在三体磨损过程中,磨料破碎会导致磨料粒度对材料磨损量的影响不显著;三种链环材料的硬度与耐磨性能呈正相关关系。在试验条件范围内,三种材料耐磨性能由高到低依次为YXKB2钢、25MnVK钢、54钢。

维生素E合成路线研究进展

维生素E是一种脂溶性维生素化合物,具有美容养颜、预防衰老、抗不育、抗氧化和抗癌等多种活性,因此对维生素E合成路线的进行探究是制药工作者关注的热点。维生素E是一种天然化学物质,具有生育酚和三烯酚两种结构,每种结构包括α、β、γ及δ4种构型,其中α-生育酚活性最高,效果最好。由于维生素E在医药领域应用范围广、市场需求量大,天然维生素E的产量无法满足临床需求。为进一步扩大维生素E的产能,研究人员发展了系列维生素E的全合成方法。本文总结了已报道的维生素E全合成路线,重点从侧链和主环两个方面进行阐述,旨在为维生素E的合成工艺改进提供参考。

刮板输送机链轮磨损对传动系统动态特性影响分析

矿用刮板输送机长期在复杂的环境中作业,链轮会发生不同程度的磨损,从而对刮板输送机动态性能产生较大影响,以SGZ 1000/3*1000矿用刮板输送机的圆环链传动系统为研究对象,首先建立了磨损链轮模型,然后对不同磨损程度下的链轮传动过程进行动力学仿真,分析了链轮磨损对系统动态特性的影响,并通过试验进行了验证。结果显示,相比无磨损时,链轮磨损加剧了运行过程中链条的速度波动,最高增大至原来的3倍;链轮与链环间的啮合接触力增加至原来的3倍;链环间的拉力增大至原来的2倍,同时拉力波动最高增大至原来的4倍。该研究为刮板输送机传动系统设计提供了理论参考。

基于RBF-PID的无障碍升降平台调速控制策略

为了提高无障碍升降平台的调速精度,提出一种基于RBF神经网络的PID自学习控制策略。建立了电机调速系统的传递函数模型,采用牛顿-欧拉法建立了圆环链传动的动力学模型,在此基础上,设计了一种基于RBF神经网络PID控制器的无障碍升降平台调速控制策略。基于Matlab/Simulink的仿真结果表明,在升降平台空载的运行状态下,RBF神经网络PID控制的跟踪性能相对于传统PID控制而言,最大跟踪误差下降了67.34%,并且优化后的RBF神经网络PID克服了传统PID不能自适应整定参数的缺点,能够实现快速收敛。

基于区块链技术的物流供应链信息加密算法优化研究

传统供应链平台往往由于中心化的特性导致信息不对称,用户数据容易面临泄露的风险。针对这一问题,提出结合区块链技术对物流供应链信息进行加密解密。区块链技术具有匿名性、去中心化等特点,能够更好的保证物流供应链中用户信息的安全,通过非对称加密以及对称加密混合的方式,并设计相应的环签名算法以及PoA共识机制。经算例验证,以区块链技术为依据的物流供应链信息加密算法相比ECC算法在加密解密的速度上大幅提升,同时CPU占有率更低,加密解密的安全性更高。