In the centrosymmetric tetranuclear title complex, [Ni4(C12H15NO3)2(CH3COO)2(N3)2(CH3OH)2]·2CH3OH, the asymmetric unit comprises half of a complex molecule and a methanol solvent molecule. The NiII ions display two different coordination environments: (i) two O atoms from the Schiff base ligand, two O atoms from symmetry-related methanol molecules and an O atom from an acetate group, one N atom from the azide group, and (ii) two O atoms and one N atom from the Schiff base, one O atom from methanol, one O atom from the acetate anion, and one N atom from the azide group. Four coplanar NiII ions are connected by two μ2-bridging O atoms from the two deprotonated Schiff bases, two μ3-O atoms from methanol molecules, two μ1,1-N atoms from two azide ions, and four O atoms from acetate groups. The shortest Ni...Ni distance in the tetranuclear unit is 2.962 (2) Å. O—H...O hydrogen bonds between the methanol solvent molecule and an acetate O atom feature in the crystal packing.

Content Based Image Retrieval (CBIR) has attracted increasing attention from both academia and industry. Relevance Feedback is one of the most effective techniques to bridge the semantic gap in CBIR. One of the key research problems related to relevance feedback is how to select the most informative images for users to label. In this paper, we propose a novel active learning algorithm, called Locally Regressive G-Optimal Design (LRGOD) for relevance feedback image retrieval. Our assumption is that for each image, its label can be well estimated based on its neighbors via a locally regressive function. LRGOD algorithm is developed based on a locally regressive least squares model which makes use of the labeled and unlabeled images, as well as simultaneously exploits the local structure of each image. The images that can minimize the maximum prediction variance are selected as the most informative ones. We evaluated the proposed LRGOD approach on two real-world image corpus: Corel and NUS-WIDE-OBJECT [5] datasets, and compare it to three state-of-the-art active learning methods. The experimental results demonstrate the effectiveness of the proposed approach.

The model and solution of the shortest path problem on time-dependent network, where the travel time of each arc depends on the entrance time to this arc, violates the FIFO property. This paper proposes a new model for time-dependent network where the flow speed of each arc depends on the time that is applicable to traffic and transportation. Besides, each arc of the network in this model as demonstrated in this paper satisfies the FIFO property and the traditional algorithm can resolve the minimum-time path problem. Finally this paper gives an example to illustrate the accuracy of this algorithm.

This study investigates the determinants and outcomes of relationship quality in the context of the Chinese travel industry. A conceptual model was developed and tested to identify the determinants and outcomes of relationship quality. Partial least squares analyses on the survey data show that five of six proposed predictors have significant influence on relationship quality, and a higher level of relationship quality results in better reputation and stronger customer loyalty. The findings will provide travel agency managers with guidelines to develop and implement effective marketing strategies in the Chinese tourism market.

A dimeric [Ce(acac) 3 (acacH) 2 ] (acacH = acetylacetone) complex has been synthesized. The crystal structure showed that the complex contains intramolecular H-bond and intermolecular H-bond formed through the neutral enol acetylacetone unidentate ligands.

Bimetallic octacyanometallates [Mo(CN)8Ni2(pn)4]n·4nH2O (1) and [Mo(CN)8Ni(en)2(H2O)][Ni(en)3]·2H2O (2) based on [Mo(CN)8]4− were synthesized in aqueous solution, and their crystal and molecular structures have been determined. The complex [Mo(CN)8Ni2(pn)4]n·4nH2O (1) consists of novel two-dimensional honeycomb-like layers. The complex [Mo(CN)8Ni(en)2(H2O)][Ni(en)3]·2H2O (2) contains a binuclear anion [Mo(CN)8Ni(en)2(H2O)]2−,[Ni(en)3]2+ cation and two lattice water molecules. Magnetic studies suggest a possible weak antiferromagnetic interaction between Ni2+ ions in 1.

The reaction of Co2(CO)8 with ClPSCH2CH2CH2S gives the Co6 cluster Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(CO)12 (5). X-ray structural analysis of 5 revealed that six Co atoms form a boat-shaped array consisting of a basal square of four cobalt atoms with two opposite edges bridged by two apical Co atoms, a semi-interstitial P atom, a propanedithiolate ligand doubly bridging a basal side and a heterocyclic phosphido ligand bridging the opposite basal edge. Reaction of 5 with PPh3 results in the formation of the mono-substituted products (Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(μ-CO)(CO)10(PPh3) (6) and (Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(μ-CO)(CO)11(PPh3) (7). Reaction of (Co6(μ6-P)(μ-SCH2CH2S)(μ-PSCH2CH2S)(CO)12 (4) with PPh3 at higher temperature results in the formation of the di-substituted cluster Co6(μ6-P)(μ-SCH2CH2S)(μ-PSCH2CH2S)(CO)10·(PPh3)2 (8). Reactions of 5 with P(OEt)3 result in the substitution of one or two carbonyl groups to give (Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(CO)11P(OEt)3)} (9) and {Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(CO)11(P(OEt)3)} (9′) with different spectral data from that of (9), and {Co6(μ6-P)(μ-SCH2CH2CH2S)(μ-PSCH2CH2CH2S)(μ-CO)(CO)9(P(OEt)3)2} (10). X-ray structural analysis of 10 identified the sites of phosphite substitution as the two apical Co atoms. A semi-bridging CO group in 10 is located on a basal side. The IR ν(CO) solution spectrum of 10 does indicate the existence of the semi-bridging CO group in the solution as well.

Through the reaction of Co2(CO)8 with four thiuram [R2NC(S)S]2*,four new sulfur-capped trinuclear cobalt carbonyl clusters Co3(CO)7(μ3-S) (μ, η2-S*C*NR2) ( I : R= Me; II : R=Et; III : R=i-Pr; IV : NR= -N Hexagon sign], were prepared and characterized by elementary analysis, IR, 1H NMR and MS spectroscopy. The crystal structure of the cluster Co3(CO)7(μ3-S)[μ, η2-S*C*'N(i-Pr)2](III) was determined by X-ray single crystal diffraction method. The crystal of III is monoclinic, belonging to space group P21/n, and the cell parameters are as follows: a=1. 145 2(2) nm, b=1. 502 8(3) nm, c=1. 214 4(2) nm; α= 90°, β=92. 15(3)°, γ=90°; V=2. 088 5(7) nm3, Z=4, F(000)=1 096, Dc=1. 747 mg · m-3, μ=2. 588 mm-1, R=0.040 7, Rw=0. 062 4. The structural analysis shows that cluster III has a pyrimidal Co3S framework and contains a heterocylic bridging bidentate ligand[μ, η2-S*C*N(i-Pr)2] linked to the Co2 and Co3 atoms of the cluster by a cobalt-carbon and a cobalt-sulfur bond respectively.

Co2 (CO) 8 与 4个二硫代双 (烷基硫代甲酰胺 )类前配体 [R2 NC(S) S]2 反应 ,得 4个含烷基硫代甲酰胺基的三核钴羰基硫簇合物 .通过元素分析、IR、 1H NMR和 MS等方法表征了它们的结构 ,用 X射线衍射法测定了其中一个簇合物 Co3 (CO) 7(μ3 - S) [μ,η2 - SCN(i- Pr) 2 ]( )的晶体结构 .晶体属单斜晶系 ,P2 1/n空间群 ,晶胞参数 a=1.1452 (2 ) nm,b=1.50 2 8(3) nm,c=1.2 144 (2 ) nm,α=90°,β =92 .15(3)°,γ =90°,V =2 .0 885(7) nm3 ,Z=4 ,F (0 0 0 ) =10 96 ,Dc=1.74 7mg· m-3 ,GOF(F2 ) =0 .835,μ=2 .588nm-1.最终因子 R[I>2 σ(I) ]=0 . 0 4 0 7,Rw=0 .0 6 2 4