A COMPARISON OF THE DETERMINATION OF STABILITY CONSTANTS OF COMPLEXES OF Cd(Ⅱ)WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO—pH—METRIC TITRATIONS AND CYCLIC VOLTAMMETRY

This paper reports the determination of stability constants for complexes of Cd(Ⅱ)with Gly, Ala,Val,Asp,Gly—Asp,Asp Gly,Gly—Gly and Gly—Gly—Gly using both micro—pH—metric titra- tions and the application of convolution—deconvolution cyclic voltammetry at 25℃ and I=0.10 mol· dm^(-3)(KNO_3).Stability constants were calculated from pH—metric data using the SUPERQUAD com- puter program and cyclic voltammograms were collected,stored and manipulated using the EG and G CONDECON 300 software.A considerably larger ligand:metal ratio(e,g.50:1)was possible using voltammetry.Evaluation of results from the two techniques suggests that stability constants for the species[CdL_2]and[CdL_3]are reliable when calculated fromvoltammetry while those for[CdL]are more reliable when determined by pH-metric titration.

A SIMPLE ACCESS TO UNSOLVATED MONOMERIC COMPLEXES OF EARLY LANTHANIDE IODIDES(CH_3OCH_2CH_2C_5H_4)_2LnI(Ln=La,Nd)VIA THE REACTION OF[(CH_3OCH_2CH_2C_5H_4)_2LnCl]_2 WITH NaI AND X-RAY CRYSTAL STRUCTURE OF THE LANTHANUM COMPLEX

(CH_3OCH_2CH_2C_5H_4)_2LnI(Ln=La,Nd)complexes have been synthesized by the reaction between NaI and[(CH_3OCH_2CH_2C_5H_4)_2LnCl]2 in THF;A single crystal X-ray study has shown that the lanthanum complex is an unsolvated monomer with lanthanum(Ⅲ)in a trigonal bipyramidal coordination geometry if the cyclopentadienyl ring is regarded as occupying a single polyhedral vertex.

The Effects of Host Diversity in Anthracnose Management and Race Composition of Colletotrichum sublineolum in Sorghum Lineage Mixtures

Alternative strategies of management of sorghum diseases were implemented using field experiments conducted in Embrapa Maize and Sorghum Research Center,Brazil in 2001 until 2003 to evaluate the efficacy of lineage mixtures of Sorghum bicolor for the control of anthracnose(caused by Colletotrichum sublineolum).The calculated values for disease severity considered the area under the disease progress curve(AUDPC)observed for the nine susceptible and resistant elite strains of sorghum planted in 30 stands randomly.Each stand was drawn in mixtures of three genotypes each,in the same proportions per plant.This design was compared with the severity of the disease measured in AUDPC calculated for each of the same nine strains of sorghum in pure stands.In most of the cases,the disease severity on the susceptible cultivars was decreased;and in some cases,reached 85%of disease reduction compared with disease progress in pure stand of correspondent plant.The implication and effect of these sorghum mixtures on the populations of C.sublineolum on each treatment were evaluated and revealed that there was an increase of frequency of complex races in most of these mixtures and a highest phenotypic diversity for virulence to pathogen populations from pure stands,than the characterized on populations collected from the mixtures,despite of the effectiveness on decrease of the anthracnose severity.

A New Approach for the Exact Solutions of Nonlinear Equations of Fractional Order via Modified Simple Equation Method

In this article, the modified simple equation method has been extended to celebrate the exact solutions of nonlinear partial time-space differential equations of fractional order. Firstly, the fractional complex transformation has been implemented to convert nonlinear partial fractional differential equations into nonlinear ordinary differential equations. Afterwards, modified simple equation method has been implemented, to find the exact solutions of these equations, in the sense of modified Riemann-Liouville derivative. For applications, the exact solutions of time-space fractional derivative Burgers’ equation and time-space fractional derivative foam drainage equation have been discussed. Moreover, it can also be concluded that the proposed method is easy, direct and concise as compared to other existing methods.

Some Simple Groups Which are Determined by Their Orders and Degree-Patterns

Let G be a finite group and Irr(G)the set of all irreducible complex characters of G.Let cd(G)be the set of all irreducible complex character degrees of G and denote byρ(G)the set of all primes which divide some character degree of G.The character-prime graphΓ(G)associated to G is a simple undirected graph whose vertex set isρ(G)and there is an edge between two distinct primes p and q if and only if the product p q divides some character degree of G.We show that the finite nonabelian simple groups A_(7),J_(1),J_(3),J_(4),L_(3)(3)and U_(3)(4)are uniquely determined by their degree-patterns and orders.

Radical cascade cyclization for the green and simple synthesis of silylated indolo[2,1-a]isoquinoline derivatives via visible light-mediated Si–H bonds activation

Photocatalytic and photoinduced silyl radicals cascade cyclization procedures for the green and simple preparation of fused tetracyclic skeleton silylated indolo[2,1-a]isoquinoline-6(5H)-ones from 2-aryl-N-acryloyl indoles with hydrosilanes are developed.The photocatalytic reaction is carried out with 9,10-dicyanoanthracene(DCA)as an organophotocatalyst and 3-acetoxyquinuclidine as hydrogen atom transfer(HAT)catalyst at room temperature under metal-and oxidant-free conditions.The keys to the success of photoredox-catalytic conversion include(1)the reductive quenching of DCA^(*)[E_(1/2)(*P/P^(-))=+1.97 V vs.SCE in MeCN]by 3-acetoxyquinuclidine(E_(p)=+1.22 V vs.SCE in MeCN),and(2)the thermodynamic feasibility of hydrogen atom abstraction from hydridic Si-H bond by electrophilic N^(+·).Particularly,the simple photoinduced cascade cyclization using(TMS)3SiH with 2-aryl-N-acryloyl indoles was exploited via an electron-donor-acceptor(EDA)complex under visible light irradiation.

Biggs Theorem for Directed Cycles and Topological Invariants of Digraphs

We generalize Biggs Theorem to the case of directed cycles of multi-digraphs allowing to compute the dimension of the directed cycle space independently of the graph representation with linear runtime complexity. By considering two-dimensional CW complex of elementary cycles and deriving formulas for the Betti numbers of the associated cellular homology groups, we extend the list of representation independent topological inavariants measuring the graph structure. We prove the computation of the 2nd Betti number to be sharp #P hard in general and present specific representation invariant sub-fillings yielding efficiently computable homology groups. Finally, we suggest how to use the provided structural measures to shed new light on graph theoretical problems as graph embeddings, discrete Morse theory and graph clustering.

The Cyclic Universes Model Based on the Split Division Algebras

The proposed cyclic universes model based on the split division algebras accounts for the inflation, the Big Bang, gravity, dark energy, dark matter, the standard model, and the masses of all elementary particles. The split algebras (complex quaternion and complex octonion) as the Furey model generate the fixed spacetime dimension number for the observable universe with the fixed 4-dimensional spacetime (4D) standard model particles and the oscillating spacetime dimension number for the oscillating universes (hidden or dark energy) with the oscillation between 11D and 11D through 10D and between 10D and 10D through 4D. 11D has the lowest rest mass, the highest speed of light, and the highest vacuum energy, while 4D has the highest rest mass, the lowest (observed) speed of light, and zero vacuum energy. In the cyclic universes model, the universes start with the positive-energy and the negative-energy 11D membrane-antimembrane dual universes from the zero-energy inter-universal void, and are followed by the transformation of the 11D membrane-antimembrane dual universes into the 10D string-antistring dual universes and the external dual gravities as in the Randall-Sundrum model, resulting in the four equal and separate universes consisting of the positive-energy 10D universe, the positive-energy external gravity, the negative-energy 10D universe, and the negative-energy external gravity. Under the fixed spacetime dimension number, the positive-energy 10D universe is transformed into 4D standard model particles through the inflation and the Big Bang. Dark matter is the right-handed neutrino, exactly five times of baryonic matter in total mass in the universe. Under the oscillating spacetime dimension number, the other three universes oscillate between 10D and 10D through 4D, resulting in the hidden universes when D > 4 and dark energy (the maximum dark energy = 3/4 = 75%) when D = 4. Eventually, all four universes return to the 10D universes.

The Reconstruction Technique of Multi-Product Production and MINLP Mathematical Modelling

Low efficiency, negative impacts on the environment and non-profitable operations are the main shortcomings of out-dated industrial processes. Such systems can be reconstructed and improved in the direction of multi-product operations. The study of this article focuses on the development of a method for multi-product operations by reconstructing out-dated industrial processes. This article contains the theory of a developed method that enables the updating of existing process units and integrated systems on the basis of reconstruction scenarios and pathways. The goals of the set out method are: 1) to maintain the existing process units and chemical plants to a greater extent, 2) to enable the potential for finding new process alternatives and technological solutions, 3) to provide a streamlined operation for all subsystems and total systems, 4) to promote environmental and social responsibilities, and 5) to apply the concept of the presented reconstruction method to non-profitable industrial processes. In regard to multi-product operations, a conceptual model is a suitable tool for the reconstruction of industrial processes. It connects several software tools and so enables quick decision-making between process alternatives. A reconstruction method provides foresight into the possible improvements to existing industrial processes. In comparison with the indirect synthesis of DME (simple reconstruction pathway), the lower operating costs from the direct synthesis of DME (complex reconstruction pathway) were confirmed.

IDMA based MAI mitigation scheme with low complexity and low latency

High complexity and high latency are key problems for multiuser detection （MUD） to be applied to a mobile station in cellular networks. To tackle these problems, an interleave division multiple access （IDMA） based multiple access scheme, grouped spread IDMA （GSIDMA）, is proposed. In a GSIDMA system, lower complexity and latency for mobile stations can be achieved by appropriately dividing active users into different groups. The system model of GSIDMA is constructed and followed by analysing on its system capacity, complexity and latency, and bit error rate （BER） performance. The extrinsic information transfer （EXIT） chart is used to analyze the convergence behavior of the iteration process. The grouping method and interleavers-reuse issue for GSIDMA are also discussed preliminarily. The analyses and simulation results indicate that the complexity and latency of the proposed scheme are much lower than those of IDMA, whereas its BER performance is close to the latter. The properties of low complexity and low latency make it more feasible for the practical implementation.

A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access

This paper investigates a peak to average power ratio （PAPR） reduction method in multicarrier code division multiple access （MC-CDMA） system. Variable code sets （VCS）, a spreading codes selection scheme, can improve the PAPR property of the MC-CDMA signals, but this technique requires an exhaustive search over the combinations of spreading code sets. It is observed that when the number of active users increases, the search complexity will increase exponentially. Based on this fact, we propose a low complexity VCS （LC-VCS） method to reduce the computational complexity. The basic idea of LC-VCS is to derive new signals using the relationship between candidature signals. Simulation results show that the proposed approach can reduce PAPR with lower comtational pucomplexity. In addition, it can be blindly received without any side information.

THE STUDY OF AN M-ARY MC-CDMA SYSTEM BASED ON CYCLIC SPREADING CODES & PRE-EQUALIZATION

A novel fast despreading scheme for M-ary Multi-Carrier Code-Division Multiple Access (MC-CDMA) system is proposed based on cyclic spreading codes and pre-equalizer. In the transmitter, the M spreading codes of each user are generated by circularly shifting the prototype spreading code. A feedback pre-equalizer is employed to process the M-ary MC- CDMA signal before transmitted. The received signal is multiplied by the Inverse Discrete Fourier Transform (IDFT) result of the mirror image code of the prototype spreading code, and then demodulated by Orthogonal Frequency-Division Multiplexing (OFDM) demodulator. Compared with the conventional M-ary MC-CDMA receiver, the proposed scheme increases bandwidth efficiency, meanwhile, it achieves M-ary despread spectrum and multi-carrier demodulation, which reduces computation complexity remarkably.

全球价值链嵌入对中国制造业碳排放的影响研究

采用标准煤法和热值法对中国制造业细分行业的碳排放水平进行测算,利用UIBE全球价值链指标数据库中的制造业全球价值链嵌入度指数,结合2007—2020年细分制造业部门的面板数据考察了全球价值链嵌入对中国制造业碳排放的影响。研究发现,全球价值链嵌入显著降低了制造业部门的碳排放水平,简单全球价值链嵌入比复杂全球价值链嵌入更能降低制造业的碳排放水平。简单全球价值链嵌入和复杂全球价值链嵌入对制造业碳排放的影响存在明显的部门异质性,中低技术水平制造业部门参与简单全球价值链分工能显著降低碳排放,而高技术水平制造业部门参与复杂全球价值链分工能显著降低碳排放。文章的研究结论为全球价值链分工背景下中国制造业的低碳转型政策制定提供了一定依据。

注意力去噪与复数LSTM的时变信道预测算法

随着无线通信技术的发展,高速场景下通信技术的研究也越来越广泛,其中获取到准确的信道状态信息对提升无线通信系统的性能具有重要的意义。针对正交频分复用系统在高速场景下,现有信道预测算法未考虑噪声影响及预测精度低的问题,提出了一种注意力去噪与复数卷积LSTM的时变信道预测算法。首先,设计了一种通道注意力信道去噪网络对信道状态信息进行去噪处理,降低了噪声对信道状态信息的影响。然后,提出了基于复数卷积层和长短期记忆网络的信道预测模型,对去噪后历史时刻的信道状态信息进行特征提取,并且对未来时刻的信道状态信息进行预测;改进后的LSTM预测模型增强了对信道时序特征的提取能力,提高了信道预测的精度。最后,结合Adam优化器对未来时刻信道状态信息进行预测输出。仿真结果表明:与对比算法相比,所提基于注意力去噪与复数卷积LSTM的时变信道预测算法对信道状态信息的预测精度更高,能够适用于高速移动场景下的时变信道预测。

广义频分复用系统峰均功率比抑制算法

为了降低广义频分复用系统存在着多载波系统中固有的高峰均功率比问题,本文提出了一种适用于广义频分复用系统的子载波抑制高峰均功率比算法。该算法以限幅法为基础,降低了系统的高峰均功率比,但与限幅法不同的是,该算法几乎不会对带外性能及误码率性能造成影响。由于子载波抑制高峰均功率比算法的峰均功率比抑制性能略差于限幅法,因此本文进一步提出将部分序列传输与子载波抑制高峰均功率比结合来进一步抑制系统高峰均功率比的算法。仿真表明:本文提出的算法的高峰均功率比抑制性能与限幅法相同,且不会对系统的带外与误码率性能造成影响。

基于二级排序元学习算法的轴承智能故障诊断

面对不同轴承故障数据集,由于小样本及不同数据集分布存在差异,导致模型在跨数据集诊断中精度不高。受人类学习过程启发,提出基于二级排序元学习算法对跨数据集的轴承故障诊断。首先对两个不同数据集进行第一级排序,将其对应为简单数据集和复杂数据集;其次把简单数据集分为元训练集和元测试集,仅对元训练集的所有任务进行第二级排序,再用少量元测试集的数据对二级排序后的模型进行微调,完成对简单数据集的故障诊断;最后用少量复杂数据集的数据对二级排序后的模型进行微调,完成对复杂数据集的故障诊断,实现跨数据集故障诊断。试验证明,与其他模型相比,该模型在轴承的小样本数据集及跨数据集上的分类结果表现更优异。

一类复映射系的广义Mandelbrot集

推广了Sh irriff所提出的由两个简单复映射的组合构造正整数阶广义M andelbrot集(简称广义M集)的方法,并由推广的一类简单复映射系,构造出一系列实数阶的广义M集。利用实验数学方法,对广义M集的结构和演化进行了研究,发现整数阶广义M集具有对称性和分形特征,小数阶广义M集出现了错动和断裂,且其演化过程依赖于相角主值范围的选取。在此基础上,阐述了广义M集的物理意义。

复杂工况条件下大跨径桥梁拱梁结合段吊装技术研究与应用

在某些特定环境下大跨径桥梁施工过程中,拱肋吊装施工阶段由于受限于复杂地理位置及工况,导致安装过程产生较多难点。通过研究分析,采取对原设计节段的再划分,解决拱肋节段的陆路运输受限问题、建立三维模型分析及优化解决吊点设置等一系列施工方法,以确保复杂的异形拱肋吊装作业顺利进行。

简单与复杂硬件单粒子效应故障率的数据获取方法探索

航空电子硬件单粒子效应故障率是系统安全性分析过程中的重要基础数据。航空电子硬件由于简单与复杂硬件两种类型的技术定义不同,其单粒子效应故障率的数据获取方法不同。本文基于AMC 20-152A-2022《航空电子硬件开发保证》的跟踪梳理分析,研究提出了简单与复杂硬件单粒子效应故障率的数据获取方法探索,可以为设计师提供参考。

民事诉讼法下民事程序三位一体研究

我国民事诉讼法于2021年和2023年两次重新修订,新法将独任制审判组织适用于一审及二审的普通程序中,改变了旧有的审判组织与审理程序互相捆绑的格局,并扩大了小额诉讼程序的适用范围,就此建立了一审终审小额诉讼程序、独任制审理程序、合议制审理程序三阶层的程序架构。在新的程序结构调整应用过程中,为了避免效率与公平顾此失彼,民事审判需要法官针对不同案件特征,划定“民事”与“商事”两个基本场域,适用不同的理念和规则,并在三程序互动联通机制完善的同时,通过良知的树立、自由的限制及真理的探究,引导民事审判权力在有效监督中正向运行。