CRYSTAL STRUCTURE OF LONG CHAIN COMPLEX OF [Cu(TTA)(4,4'-BIPYRIDINE)]_n

The crystal structure of[Cu(2-thienoyl-trifluoroacetone)(4,4—bipyridine)]_n was determined by X-ray diffraction analysis. The crystal belongs to monoclinie with the space group C2/c, Mr=440.91, a=9.640(5) A, b=24.97(1) A, c=16.032(7) A, β=106.76(3)°,V=3695(3) A^3, Z=8, Dc=1.58g/cm^3, F(000)=1776. Final R and Rw are 0.062 and 0.069, respectively. The local coordination geometry around Cu(I) ion is a distorted tetrahedron. Cu(TTA) are linked with 4,4-bipyridine, forming long chain in the crystal.

A Global Reduction Based Algorithm for Computing Homology of Chain Complexes

In this paper, we propose a new algorithm to compute the homology of a finitely generated chain complex. Our method is based on grouping several reductions into structures that can be encoded as directed acyclic graphs. The organized reduction pairs lead to sequences of projection maps that reduce the number of generators while preserving the homology groups of the original chain complex. This sequencing of reduction pairs allows updating the boundary information in a single step for a whole set of reductions, which shows impressive gains in computational performance compared to existing methods. In addition, our method gives the homology generators for a small additional cost.

Syntheses, Crystal Structures and Properties of Two New W-Ag 1D Chain Complexes: [W_2Ag_2S_8·Ca(DMF)_6]_n and [WAgS_4·Na(DMF)_3]_n

Two new complexes, [W2Ag2S8?Ca(DMF)6]n 1 and [WAgS4?Na(DMF)3]n 2, have been synthesized and characterized. Single-crystal X-ray analyses show both 1 and 2 have {WAgS4}n anion linear chains, but 1 has a discrete [Ca(DMF)6]2+ cation while 2 is a linear chain. UV-Visible-Near-IR spectroscopy data show that the bandgaps of the two complexes are 1.86 and 1.99 eV, respectively. Electrical conductivity measurements reveal the conductivities of 1 and 2 are 10?7 and 10?8 Scm?1, respectively and they exhibit thermally activated temperature depen- dence, which may be attributed to semiconductors.

Synthesis and Crystal Structure of One-dimensional Chain Complexes [K(18-C-6)]_2[M(mnt)_2](M=Zn,Hg)

The reactions of 18 crown 6 with each of K 2(M=Zn, Hg; mnt=1,2 dicyanoethene 1,2 dithiolate, C 2S 2(CN) 2- 2) were studied and novel complexes [K(18 C 6)] 2[Zn(mnt) 2](1) and [K(18 C 6)] 2[Hg(mnt) 2](2) were characterized by elemental analysis, IR spectrum and X ray diffraction analysis. Complex 1 displays a one dimensional chain of [K(18 C 6)] 2[Zn(mnt) 2] bridged by K O interactions between adjacent [K(18 C 6)] + units. Complex 2 is also a one dimensional chain of [K(18 C 6)] 2[Hg(mnt) 2] bridged by K...S weak interactions between adjacent [K(18 C 6)] + and [Hg(mnt) 2] 2- .

A 1D Double Stranded Chain Complex Based on Barium Ion and 1,3,5-Triazine

A new coordination compound [Ba（OBPT）2（H2O）2]·H2O was obtained at room temperature by the reaction of 4,6-bis（2-pyridyl）-1,3,5-triazin-2-ol（HOBPT） with BaCl2.It was characterized by elemental analysis,FTIR,TG analysis,powder X-ray diffraction analysis and single-crystal X-ray diffraction analysis.The complex crystallizes in the monoclinic P21/n space group,with a = 16.325（1）,b = 6.7977（5）,c = 24.164（2） ,β = 104.009（1）,V = 2601.8（3） 3,Z =4,C26H22BaN10O5,Mr = 691.88,Dc = 1.766 g/cm3,F（000） = 1376 and μ（MoKα） = 1.587 mm-1.The final R = 0.0282 and wR = 0.0724 for 5095 observed reflections with I 〉 2σ（I） and R = 0.0312 and wR = 0.0744 for all data.In the complex,the barium ion is ten-coordinated with six nitrogen atoms from two ligands,two deprotonated hydroxyl oxygen atoms from another two ligands and two coordinated water molecules to form a double stranded chain.The extensive supramolecular interac-tions lead to the formation of an infinite 2D framework.

Elevation as a selective force on mitochondrial respiratory chain complexes of the Phrynocephalus lizards in the Tibetan plateau

Animals living in extremely high elevations have to adapt to low temperatures and low oxygen availability(hypoxia),but the underlying genetic mechanisms associated with these adaptations are still unclear.The mitochondrial respiratory chain can provide>95%of the ATP in animal cells,and its efficiency is influenced by temperature and oxygen availability.Therefore,the respiratory chain complexes(RCCs)could be important molecular targets for positive selection associated with respiratory adaptation in high-altitude environments.Here,we investigated positive selection in 5 RCCs and their assembly factors by analyzing sequences of 106 genes obtained through RNA-seq of all 15 Chinese Phrynocephalus lizard species,which are distributed from lowlands to the Tibetan plateau(average elevation>4,500 m).Our results indicate that evidence of positive selec-tion on RCC genes is not significantly different from assembly factors,and we found no difference in selective pressures among the 5 complexes.We specifically looked for positive selection in line-ages where changes in habitat elevation happened.The group of lineages evolving from low to high altitude show stronger signals of positive selection than lineages evolving from high to low elevations.Lineages evolving from low to high elevation also have more shared codons under positive selection,though the changes are not equivalent at the amino acid level.This study advan-ces our understanding of the genetic basis of animal respiratory metabolism evolution in extreme high environments and provides candidate genes for further confirmation with functional analyses.

Synthesis, Structure, and Luminescent and Dielectric Properties of a Novel 1D Chain Zinc(Ⅱ) Complex {[Zn(DCImPyO)·(H_2O)_2·]·H_3O}_n

Under hydrothermal conditions, 4-（4,5-dicarboxy-lH-imidazol-2-yl）pyridine 1-oxide （H3DCImPyO） reacted with ZnC12 to give the 1D chain complex {[Zn（DCImPyO）·（H2O）2·]·H3O}n （1）. Single-crystal X-ray determination shows that complex 1 crystallizes in the monoclinic system, space group P21/c with a = 9.488（2）, b = 13.247（3）, c = 12.959（4） A, β = 126.716（19）°, Z = 4, V= 1305.6（6）/k3, C10H11N3O8Zn, Dc = 1.865 g/cm3, Mr = 366.61, 2（MoKa） = 0.71073 A, μ= 1.930 mm1, F（000） = 744, R = 0.0472 and wR = 0.1487. Fluorescent analysis showed an intense emission band at 422 nm when the exciting radiation was set at 378 nm. Dielectric constant of complex 1 was measured at different frequencies with temperature variation.

Synthesis,Structure and Dielectric Properties of a Novel 1D Chain Bismuth(Ⅲ) Complex[(C_6H_6NO_2)_2·(BiCl_5)·2H_2O]_n

Under hydrothermal conditions,isonicotinic acid reacted with BiCl 3 to give 1D zigzag chain complex [（C 6 H 6 NO 2） 2 ·（BiCl 5）·2H 2 O] n （1）.Single-crystal X-ray determination shows that compound 1 crystal-lizes in the monoclinic system,space group C2/c with a=13.115（3）,b=19.957（4）,c=7.9374（16）,β=97.45（3）°,Z=4,V=2060.0（8） 3,C 12 H 16 BiCl 5 N 2 O 6,D c=2.162 g/cm 3,M r=670.50,λ（MoKa）=0.71073,μ=9.237 mm-1,F（000）=1272,R=0.0208 and wR=0.0503.Dielectric constant of compound 1 was measured at different conditions.Measurements on the dielectric properties of 1 showed that the 1D chain coordination polymer exhibited a dipolar chain relaxation process and a relatively high dielectric constant.

A MEASURE OF SUPPLY CHAIN COMPLEXITY INCORPORATING VIRTUAL ARCS

Increased globalization, as well as the ability to have virtual supply chain partners, has had numerous effects on supply chains. While some of these effects are positive, making more resilient supply chains, there are also the negative effects of scale ~nd complexity, making these supply chains more challenging than ever to manage. Having a means to measure the complexity is crucial for today＇s managers to make more informed decisions. This measure must not only account for the number of arcs, but the amount of information and material carried on it, as well as incorporate the benefit that virtual arcs add to the network by increasing efficiency and reducing information, product and financial transfer costs and time. This research utilizes newer models in network clustering and complexity theory to make them applicable to supply chains and creates a new, practical approach to measuring supply chain complexity which can be easily implemented by practitioners.

Structure of the Heterobimetallic Linear-Chain Polymeric Complex [NH_4]_n [WAgS_4]_n and Influence of Cationic Valence State on Configurations of Polymeric W/Ag/S Complexes

The title complex [NH4]n [WAgS4]n crystallizes in the tetragonalspace group I4 with crystallographic parameters: a = b = 7. 994 (2 ), c = 5. 855 (2 ):A,V = 373. g(2) A3, Z=2, Dc= 3. 89 g/cm3, F(000) = 392, μ= 19. 27 mm-l , A(MoKα) = 0. 71069, Mr = 438. 01, and the convergence factors R = 0. 045, Rw =0. 055 for 341 observed reflections (I>3σ(I)). The anion structure can be viewed as apolymeric single chain consisting of unlimited extended rhombic fragruents of -AgS2W-which are alternately perpendicular to each other. Additionally, influence of di- and tri-valent complex cations on the assembIy of WS2-4 and Ag+ is briefly discussed.

Empirical topological investigation of practical supply chains based on complex networks

The industrial supply chain networks basically capture the circulation of social resource, dominating the stability and efficiency of the industrial system. In this paper, we provide an empirical study of the topology of smartphone supply chain network. The supply chain network is constructed using open online data. Our experimental results show that the smartphone supply chain network has small-world feature with scale-free degree distribution, in which a few high degree nodes play a key role in the function and can effectively reduce the communication cost. We also detect the community structure to find the basic functional unit. It shows that information communication between nodes is crucial to improve the resource utilization. We should pay attention to the global resource configuration for such electronic production management.

Mass spectrometry assisted assignments of binding and cleavage sites of Zn(Ⅱ)complex towards oxidized insulin B chain

The electrospray ionization mass spectrometry investigation showed that the binding sites of [ZnL]^2＋, where L is 2-[bis（2- aminoethyl）amino]ethanol, with oxidized insulin B chain are Phel, His5 and Arg22, which lead to the selective cleavages of the peptide bonds at Phe1-Val2, His5-Leu6, Glu21-Arg22, and Arg22-Gly23 of oxidized insulin B chain.

Crystal Structure, Thermal Analysis and Theoretical Calculation of a One-dimensional Chain Complex [Zn(dafo)_2(H2O)_2](NO_3)_2

A novel one-dimensional chain complex [Zn(dafo)2(H2O)2](NO3)2 was obtained when we tried synthesizing a mixed ligand supramolecular compound of Zinc(II) with dafo and o-phthalic acid. Its structure was determined by single-crystal X-ray diffraction analysis. The crystal belongs to triclinic system, P-1 space group. The crystallo- graphic data: a=0.6989(4) nm, b=0.8281(5) nm, c=1.0231(5) nm, α=94.934(5)°, β=91.366(7)°, γ=99.820(7)°, V=0.5809(5) nm3, Z=1, F(000)=300, Mr=589.78, Dc=1.686 g/cm3, μ(Mo Kα)=1.130 mm-1, R1=0.0521, wR2 =0.1096. The analysis of the crystal structure indicates that the compound has a one-dimensional chain structure which is formed by hydrogen bonds. The constitutes of the title complex were proved by elemental analysis, IR spectra and thermal analysis. On the basis of the experimentation, the complex was calculated by DFT-B3LYP/LANL2DZ in Gaussian-98w also.

Hydrothermal Synthesis,Crystal Structure and Thermal Properties of a Novel Samarium Complex with 1D Nano-chain Structure

1 Introduction The design and construction of metal-organic polymers has been a field of rapid growth in materials chemistry because of their intriguing topologies and potential applications as functional materials. In this regard, every effort has been devoted to the deliberate design and control of self-assembly infinite coordination networks via selecting the chemistry structures of ligands, Multidentate carboxylate ligands are widely adopted for construction of coordination frameworks due to their rich coordination modes.

Discrete decision model and multi-agent simulation of the Liang Zong two-chain hierarchical organization in a complex project

Different from the organization structure of complex projects in Western countries, the Liang Zong hierarchical organization structure of complex projects in China has two different chains, the chief-engineer chain and the general-director chain,to handle the trade-off between technical and management decisions. However, previous works on organization search have mainly focused on the single-chain hierarchical organization in which all decisions are regarded as homogeneous. The heterogeneity and the interdependency between technical decisions and management decisions have been neglected. A two-chain hierarchical organization structure mapped from a real complex project is constructed. Then, a discrete decision model for a Liang Zong two-chain hierarchical organization in an NK model framework is proposed. This model proves that this kind of organization structure can reduce the search space by a large amount and that the search process should reach a final stable state more quickly. For a more complicated decision mechanism, a multi-agent simulation based on the above NK model is used to explore the effect of the two-chain organization structure on the speed, stability, and performance of the search process. The results provide three insights into how, compared with the single-chain hierarchical organization, the two-chain organization can improve the search process: it can reduce the number of iterations efficiently; the search is more stable because the search space is a smoother hill-like fitness landscape; in general, the search performance can be improved.However, when the organization structure is very complicated, the performance of a two-chain organization is inferior to that of a single-chain organization. These findings about the efficiency of the unique Chinese-style organization structure can be used to guide organization design for complex projects.

Synthesis of Branched Polyethylene via Bulky α-Diimine Nickel(II)-Catalyzed Ethylene Chain-Walking Polymerization

The catalysis of olefin polymerization through the chain-walking process is a subject of great interest. In this contribution, the successful synthesis of a Brookhart-type unsymmetrical α-diimine nickel catalyst Ni, which contains both dibenzhydryl and phenyl groups, was determined by X-ray crystallography. The compound has a pseudo-tetrahedral geometry at the Ni center, showing pseudo-C2-symmetry. Upon activation with modified methylaluminoxane (MMAO), Ni1 exhibits high catalytic activity up to 1.02 × 107 g PE (mol Ni h)−1 toward ethylene polymerization, enabling the synthesis of high molecular weight branched polyethylene. The molecular weights and branching densities could be tuned over a very wide range. The polymerization results indicated the possibility of precise microstructure control, depending on the polymerization temperature. The branching densities were decreased with increasing the polymerization temperature.

Synchronization of spatiotemporal chaos in complex networks via backstepping

A backstepping approach is proposed for the synchronization of chain networks of multi-spatiotemporal chaotic systems with topologically equivalent structures. The synchronization of multi-spatiotemporal chaotic systems is imple- merited by adding the control only to a terminal node, and the controller is designed via a corresponding update law. The control law is applied to spatiotemporal Gray-Scott systems. Numerical results demonstrate the effectiveness and the feasibility of the proposed approach.

关于问题1|chains,B|C_(max)的多项式算法

对带有"扩充链"优先约束的分批排序问题进行了研究,其目标函数为最大完工时间.优先约束为:在一个"扩充链"上包含有n个工件,另外有m个孤立点工件(即工件之间无任何优先约束).讨论了B=2时问题的最优算法,把这一问题多项式转化成了组合最优化中求解非二部图赋权匹配问题,并相应地给出了一个运算次数为O(n4)的多项式算法.

老年重症肺炎合并呼吸衰竭患者血清Gal-3、MICA、25(OH)D水平及其对病情、预后的影响

目的探讨老年重症肺炎(SP)合并呼吸衰竭(RF)患者血清半乳糖凝集素-3(Gal-3)、主要组织相容性复合体Ⅰ相关分子A(MICA)、25-羟维生素D[25(OH)D]水平及其对病情、预后的影响。方法选取2022年8月—2024年7月北大荒集团总医院重症医学科收治的老年SP患者342例为研究对象,根据是否合并RF将患者分为RF组171例和非RF组171例。根据急性生理学及慢性健康状况评分Ⅱ(APACHEⅡ)将老年SP合并RF患者分为低危亚组41例、中危亚组77例、高危亚组53例;根据随访28 d预后情况将老年SP合并RF患者分为死亡亚组51例和生存亚组120例。采用ELISA法检测血清Gal-3、MICA水平,采用高效液相色谱—串联质谱法(LC-MS/MS)检测血清25(OH)D水平;采用Spearman法分析血清Gal-3、MICA、25(OH)D水平与病情程度的相关性;多因素Logistic回归分析老年SP合并RF患者预后死亡的影响因素;受试者工作特征(ROC)曲线评价血清Gal-3、MICA、25(OH)D水平对老年SP合并RF患者预后死亡的预测价值。结果RF组血清Gal-3、MICA水平高于非RF组,血清25(OH)D水平低于非RF组(t/P=12.674/<0.001、20.954/<0.001、22.872/<0.001);伴随病情加重,老年SP合并RF患者血清Gal-3、MICA水平逐渐升高,血清25(OH)D水平逐渐降低(F/P=41.512/<0.001、221.162/<0.001、165.574/<0.001);Spearman相关性分析显示,老年SP合并RF患者病情严重程度与血清Gal-3、MICA水平呈正相关(r=0.682、0.726,P均<0.001),与血清25(OH)D水平呈负相关(r=-0.733,P<0.001);随访28 d,171例老年SP合并RF患者死亡发生率为29.82%(51/171)。死亡亚组氧合指数(PaO_(2)/FiO_(2))、血清25(OH)D水平低于生存亚组,机械通气时间、APACHEⅡ评分、血清Gal-3、MICA水平高于生存亚组(t/P=2.392/0.018、13.242/<0.001、2.235/0.027、10.805/<0.001、7.852/<0.001、16.923/<0.001);多因素Logistic回归分析结果显示,机械通气时间长、APACHEⅡ评分高、Gal-3高、MICA高为老年SP合并RF患者预后死亡的独立危险因素[OR(95%CI)=2.518(1.385~4.578)、3.157(1.849~5.391)、3.264(1.863~5.717)、4.116(2.025~8.368)],PaO_(2)/FiO_(2)高、25(OH)D高为独立保护因素[OR(95%CI)=0.549(0.346~0.870)、0.426(0.272~0.667)];血清Gal-3、MICA、25(OH)D水平及三者联合预测老年SP合并RF患者预后死亡的曲线下面积(AUC)分别为0.855、0.850、0.835、0.968,三者联合的AUC大于血清Gal-3、MICA、25(OH)D水平单独预测(Z=3.600、3.652、4.001,P均<0.001)。结论老年SP合并RF患者血清Gal-3、MICA水平升高,25(OH)D水平降低,三者水平与老年SP合并RF患者病情严重程度密切相关,三者联合预测老年SP合并RF患者预后死亡的价值较高。