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The tripodal ligand 3,5-di(1H-imidazol-1-yl)benzoic acid was used to synthesize five new inorganic–organic hybrid materials based on Keggin-type POMs, which is of great significance in the field of environmental monitoring.

Inspired by electronic transistors, electric field gating has been adopted to manipulate ionic currents of smart nanofluidic devices. Here, we report a PNP nanofluidic bipolar junction transistor (nBJT) consisting of one polyaniline (PANI) layer sandwiched between two polyethylene terephthalate (PET) nanoporous membranes. The PNP nBJT exhibits three different responses of currents (quasi-linear, rectification, and sigmoid) due to the counterbalance between surface charge distribution and base voltage applied in the nanofluidic channels; thus, they can be switched by base voltage. Four operating modes (cutoff, active, saturation, and breakdown mode) occur in the collector response currents. Under optimal conditions, the PNP nBJT exhibits an average current gain of up to 95 in 100 mM KCl solution at a low base voltage of 0.2 V. The present nBJT is promising for fabrication of nanofluidic devices with logical-control functions for analysis of single molecules.

Molecularly imprinted polymers (MIPs) have the ability of predesigned specific recognition that can be selected to construct reliable functional materials. Combining the MIPs with magnetic nanopart...

A 3D Strandberg-type polyoxometalate-based inorganic-organic hybrid, [Ag4(H3L)2(P2Mo5O23)]·H2O (1) (H2L = 2,6-dimethyl-3,5-bis(pyrazol-3-yl)pyridine), has been synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffraction, elemental analysis, IR, TG and powder X-ray diffraction. In compound 1, the adjacent [P2Mo5O23]6− clusters are linked by Ag1 into a 2D layer with left- and right-handed helical chains. And the layers are further linked together through organic ligands H2L and Ag⋯Ag interactions into a 3D framework with 1D channels extended along c axis. The luminescence, electrochemical properties and photocatalytic activities of compound 1 have also been investigated.

By using a V-shaped multidentate N-donor ligand, four new octamolybdate-based inorganic-organic hybrids, formulated as [Cu4(H3X)4(H2O)2(β-Mo8O26)2]·7H2O (1), [Cu2(H2X)(β-Mo8O26)0.5]·H2O (2), [Co(H3X)2(H4Mo8O28)] (3) and [Ni(H3X)2(H4Mo8O28)] (4) (H2X = 2,6-dimethyl-3,5-bis(pyrazol-3-yl)pyridine), have been synthesized successfully under hydrothermal conditions and characterized by single crystal X-ray diffraction analyses, elemental analyses and IR spectra. Compounds 1 and 2 with helical chains exhibit three-dimensional (3D) frameworks with (3,4)-connected {83}2{85;10} and (3,4,6)-connected {4;62}2{42;64}2{42;68;82;103} topologies, respectively. Compounds 3 and 4 are isostructural, in which [H4Mo8O28]4− clusters act as bidentate ligands to join 1D {[M(H3X)2]4+}n (M = Co or Ni) chains to generate a 2D layer. Moreover, the luminescent properties of compounds 1 and 2 have been investigated. The electrochemical study displays that compound 3 could be used as electrocatalysts in the electrical reduction of nitrite.

Two coordination polymers (CPs) based on Keggin-type [SiW12O40]4– (SiW12), [Zn2(bpy)2(SiW12O40)(DMF)8]·solvent (1) and [Zn2(bpy)(SiW12O40)(DMA)8]·2DMA (2) (bpy = 4,4′-bipyridine, DMF = N,N′-dimethylformamide; DMA = N,N′-dimethylacetamide), have been solvo-thermally synthesized and characterized by single crystal X-ray diffraction, powder X-ray diffraction, IR spectra, elemental analyses and thermogravimetric analyses. Both 1 and 2 are synthesized under similar conditions except DMF and DMA were used as the solvents for 1 and 2, respectively. Structural studies reveal that the supramolecular framework of 1 contains pumpkin-like voids, while 2 has a non-porous supramolecular framework. These results show that solvents play an important role in construction of the POM-based CPs. The luminescent properties for 1 and 2 have also been investigated.

In-cylinder charge density at top dead center is an important parameter of diesel engines and is influenced by intake pressure, intake temperature, and compression ratio. The effects of charge density on fuel spray, combustion process, and emissions were investigated by using a constant volume bomb and a heavy-duty diesel engine. Spray development resistance increased with the increase of the charge density in the constant volume bomb. It was found that short spray penetration was accompanied by a large spray cone angle in the former stage with high charge density. However, the equivalence ratio was lowered and the degree of homogeneity of the mixture was increased in the later stage owing to the rapid interaction of fuel and gas at a high mixing rate. Combining the first law of thermodynamics and the second law of thermodynamics for analysis, as the charge density increased, the gross indicated thermal efficiency (ITEg) was improved. However, pumping loss had to be considered with higher charge density. Under this condition, the brake thermal efficiency (BTE) trend was increased initially and decreased subsequently. Under high-load operation (1200 r/min BMEP, 2.0 MPa), the minimum charge density value of 44.8 kg/m3 was found to be reasonable. This charge density was suitable for combustion and brought about minimum exhaust energy and trade-off emissions. Moreover, by analyzing two operation conditions in terms of the maximum BTE with the Miller and the conventional cycles, compression temperature and combustion temperature were reduced in the Miller cycle with the charge density 44.8 kg/m3. A high Cp/Cv could improve the cylinder exergy/power conversion process by its positive effect of increasing the specific heat ratio. Owing to the interaction between a high Cp/Cv and exergy loss to heat transfer, the condition with the minimal charge density could produce more piston work.

Two novel coordination compounds, [Zn(Hbimh) (H2O)]·H2O (1) and [Zn(Hbimh)]·(4,4ʹ-bpy)0.5 (2) (H3bimh = benzimidazole-5,6-hydrazide, 4,4ʹ-bpy = 4,4ʹ-bipyridine), have been prepared from the hydrothermal in situ amidation cyclization reactions of H3bimdc (H3bimdc = benzimidazole-5,6-dicarboxylic acid) and hydrazine hydrate (N2H4·H2O). Compound 1 exhibits a one-dimensional (1D) hexagon channel structure. Compound 2 is a three-dimensional (3D) framework structure, with 4,4ʹ-bpy fill the channels. We also obtained the ligand H3bimh. The compounds were characterized by IR, PXRD, TGA and elemental analysis. The fluorescence properties in the solid state at room temperature were also investigated.

One new supramolecular compound based on H2L (H2L = 4-[(8-hydroxy-5-quinolinyl)azo]-benzenesulfonic acid, C15H11O4N3S), [Zn3L2(OH)2(H2O)6]n (1), has been synthesized by hydrothermal technique. Compound 1 exhibits a one-dimensional (1-D) double-chain structure. Compound 1 is the first example of an azo complex used to co-sensitize TiO2 photoanode with Ru dyes (N719, N3). In the tandem structure of compound 1/N719/TiO2, compound 1 plays a significant role in the improvement of the photoelectric conversion efficiency, which works with N719 to modify the energy level. The results show that the compound 1/N719/TiO2 solar cell exhibited excellent photovoltaic performance with the photoelectric conversion efficiency of 7.1% under standard global AM 1.5 solar irradiation conditions.

One new 3D Zn(II) coordination polymer based on H2L (H2L = 4-[(8-hydroxy-5-quinolinyl)azo]-benzenesulfonic acid), [ZnL(H2O)]n (1), has been synthesized. This compound displays an amazing (3, 6)-connected topological net. Compound 1 is the first example of azo coordination compound co-sensitized TiO2 photoanode with N719. In the tandem structure of compound 1/N719/TiO2, compound 1 forms a re-organization of energy level due to its single-crystal structure, which is advantageous the improving of photoelectric conversion efficiency. The result demonstrates the compound 1/N719/TiO2 solar cell exhibited excellent photovoltaic performance with the photoelectric conversion efficiency of 8.2% under standard global AM 1.5 solar irradiation conditions. Fluorescent property and electrochemical property of compound 1 were performed.

Three new supramolecular compounds, [Cu(o-HPIDC)(bpy)(H2O)]·2H2O 1, [Cu(o-H2PIDC)(phen)Cl]·[Cu(phen)2Cl]·10H2O·Cl 2 and {[Cd(o-H2PIDC)(H2O)2Cl]·H2O}2 3 (o-H3PIDC = 2-(pyridine-2-yl)-1H-imidazole-4,5-dicarboxylic acid, bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline), were hydrothermally synthesized and characterized. In compound 1, the adjacent two supramolecular layers are constructed from different types of helical chains with the same pitch. In compound 2, the adjacent 2D water-chloride layers, {[(H2O)10Cl]−}n, are pillared by [Cu(o-H2PIDC)(phen)Cl] units to form the overall 3D supramolecular network with 1D channels through O H⋯O hydrogen bond interactions. In compound 3, two Cd(II) are linked into a binuclear [Cd2(o-H2PIDC)2(H2O)4Cl2] with a ten-membered ring by two o-H2PIDC− ligands. The three compounds self-assemble into 3D supramolecular structures via hydrogen bond and π-π stacking interactions. The fluorescence properties of compound 3 was also investigated.

A novel 3D supramolecular compound assembled from Strandberg-type polyoxometalate and benzimidazole [Hbiz]5[HMo5P2O23]·5H2O (1, biz = benzimidazole) was synthesized with a convenient aqueous solution method and structurally characterized through single-crystal X-ray diffraction, elemental analysis, IR and UV–vis spectrum analyses. Single-crystal X-ray analysis revealed that the title compound crystallized in the monoclinic system space group P21/c with a = 11.415(2), b = 33.311(7), c = 13.941(3) A, β = 99.2279(3)°, V = 5232.0(18) A3, and Z = 4. Compound 1 was composed of one [HMo5P2O23]5 − polyanion, five protonated biz cations, and five crystal water molecules; it displayed a 3D supramolecular structure through electrostatic attraction, hydrogen bonding, and π–π interactions. The experiment on anti-tumor activities in vitro showed that compound 1 inhibited human neuroblastoma SHY5Y cells and demonstrated dose dependency and selectivity.

Based on the hydrothermal in situ acylation reaction of benzene-1,2,4-tricarboxylic acid (btca) with N2H4·H2O, two containing-4-carboxylphthalhydrazidate Mn2+/In3+ coordination polymers, [Mn(cpth)(phen)] 1 and [In(cpth)(ox)0.5(phen)]·H2O 2 (cpth = 4-carboxylphthalhydrazidate, phen = 1,10-phenanthroline, ox = oxalate), were obtained and characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. In compound 1, the cpth ligands exhibit a μ4-bridging mode, which link Mn(II) centers into a 2-D layer structure with ancillary phen molecules. In compound 2, the cpth ligands exhibit a μ2-bridging mode, which link In(III) centers into a binuclear unit. Ox ligands act as the second linkers, extending binuclear unit into a 1-D chain with ancillary phen molecules. Via N H⋯O interactions, compound 2 self-assembles into a 2-D supramolecular layer. The magnetic analysis indicates that there exists antiferromagnetic interactions between magnetic centers in compound 1. The photoluminescence properties of compounds 1 and 2 were also investigated in an aqueous solution.

Three novel coordination polymers, namely, [Zn2(betc)(L1)H(H2O)]·2H2O (1), [Zn2(btec)(L2)2] (2) and [Zn5(btec)2(L3)1.5(OH)2]·2H2O (3) (L1 = 3,5-di(1H-imidazol-1-yl)benzoate, L2 = 1,3-bis((1H-1,2,4-triazol-1-yl)methyl)benzene and L3 = 1,3-di(1H-1,2,4-triazol-1-yl)propane), have been hydrothermally synthesized. Compound 1 shows a three dimensional (3D) framework with fsc-3,5-P4/mbm topology. Compound 2 reveals a 3D pillar-layered framework with the presence of 3-fold left- and right-handed helical chains. Compound 3 also exhibits a 3D framework based on 1D zinc chains. In addition, the luminescent properties for 1–3 have also been investigated.

Based on the hydrothermal in situ acylation reaction of 4,4′-sulfoyldiphthalic anhydride (sdpha) with N2H4⋅H2O, two isostructural oxalate-propagated Mn2+/Fe2+-diacylhydrazidate coordination polymers, [M3(sdpth)2(ox)(H2O)2]⋅2H2O (M2+ = Mn2+ 1, Fe2+ 2; sdpth = 4,4′-sulfoyldiphthalhydrazidate, ox = oxalate), were obtained and characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. In both compounds, ox ligands act as the second linkers, extending the metal-diacylhydrazidate chains into a 2-D layer. Via N H⋯O interactions, compounds 1 and 2 self-assemble into 3-D supramolecular networks. The magnetic analyses indicate that there are antiferromagnetic interactions between magnetic centers in compounds 1 and 2. The photoluminescence properties of compounds 1 and 2 were also investigated in an aqueous solution.

To observe the effect of different acupuncture intervention time on the improvement of the symptoms of acute facial neuritis and the length of recovery time, and to find the best interventional opportunity for acute facial neuritis.A total of 120 patients with acute facial neuritis (all unilateral onset) were randomly divided into 4 groups, namely group A, group B, group C and group D, 30 cases in each group. Acupuncture performed within 3 days after onset in the group A; oral mecobalamin dispersible tablets and multivitamin B tablets were received within 3 days after onset, and acupuncture was started from the 4th day in the group B; oral mecobalamin dispersible tablets and multivitamin B tablets were given within 5 days after onset, and acupuncture was administered from the 6th day in the group C; oral mecobalamin dispersible tablets and multivitamin B tablets were given within 7 days after onset, and acupuncture was applied from the 8th day in the group D. Penetration needling was the main acupuncture treatment, with infrared radiation on the cheeks, once a day, 6 days a week and 3 weeks were given. After treatment, the symptom scores (Portmann scores) of the 7th, 14th and 28th day after onset were compared. The time of improvement and the clinical effect of each group were compared.On the 7th, 14th and 28th day after onset, the Portmann scores of the 4 groups were higher than those before treatment (allEarly intervention of acupuncture with acute facial neuritis can appropriately slow the progression of facial nerve injury, improve the therapeutic effect, and shorten the clinical recovery time.

Under solvothermal conditions a new coordination polymer, [Ag(L)0.5]n (1) (H2L = azobenzene-4,4′-dicarboxylate), has been obtained successfully. Complex 1 has a three-dimensional (3D) framework structure with (3,6)-connected {4.62}2{42.610.83} topology. The co-sensitization of complex 1 and Ru-bipyridine dye (N719) increases the absorption of the dye-sensitized solar cells (DSSCs) in the ultraviolet region. When the illumination intensity is 100 mW cm−2, the photoelectric conversion efficiency of DSSC (complex 1/N719/TiO2) can reach to 3.14%. The result shows that the DSSC (complex 1/N719/TiO2) possessed excellent photovoltaic performance. Moreover, fluorescent property was also investigated.

By using azobenzene-4,4′-dicarboxylate (H2L) ligand, a new coordination polymer, formulated as [Mn(L)(H2O)2]n (1), has been synthesized successfully under solvothermal conditions. Complex 1 exhibits a three-dimensional (3D) framework with (4,4)-connected {65.8} topology. Moreover, the fluorescent property of complex 1 has been investigated. The electrochemical study displays that complex 1 forms a re-organization of energy level due to its single-crystal structure in the tandem structure of complex 1/N719/TiO2. The result demonstrates that the complex 1/N719/TiO2 solar cell exhibited excellent photovoltaic performance with the photoelectric conversion efficiency of 3.70% under 100 mW cm−2 illumination.

Three unprecedented high-connected 3D lanthanide coordination polymers based on benzene-1,2,4,5-tetracarboxylic acid (H4bta), {[Ln2(bta)1.5(H2O)4] · 3H2O}n (Ln = La (1) and Ce (2)) and [Pr(bta)0.5(H2bta)0.5(H2O)]n (3), have been synthesized under hydrothermal conditions. Complexes 1 and 2 show trinodal (4,4,10)-connected 3D network structures consisting of tetranuclear metal clusters bridged by bta4 − ligands, and a chair conformation hexamer water cluster can be found within the cage enclosed by eight neighboring tetranuclear metal clusters in the two complexes. While 3 consists of 2D {Pr(bta)0.5}n layers linked by H2bta2 − ligands, resulting in an unprecedented trinodal (4,6,10)-connected 3D topological network. The organic ligand exhibits five kinds of coordination modes, in which one of them is reported for the first time. Moreover, the luminescent properties of 1–3 have also been investigated.

A new paradodecatungstate-B compound decorated by transition metal copper, Na2Cu5(H2O)24(OH)2[H2W12O42]·10H2O (1), has been synthesized by convenient aqueous solution method and structurally characterized by single-crystal X-ray diffraction, IR spectrum, elemental analysis and TGA. The compound crystallizes in the triclinic P-1 space group with a = 10.7140(8) A, b = 12.9476(9) A, c = 13.6696(10) A, α = 73.56°, β = 75.73°, γ = 67.69°, V = 1661.8(2) A3 and Z = 1. In compound 1, polyanion of [H2W12O42]10 − acts as a dodecadentate ligand that links copper and sodium cations, forming a remarkable three-dimensional framework. The experiment of antitumor activities in vitro shows that the title compound exhibits remarkable inhibitory actions on human cervical carcinoma HeLa cells, ovarian carcinoma SKOV-3 cells, hepatoma HepG2 cells and neuroblastoma SHY5Y cells.

Three new inorganic-organic hybrids constructed from a half rigid N-heterocyclic carboxylate ligand, K[Ag3(HL1)4](Mo8O26) (1), [Ag4(HL1)2(HL2)2(SiMo12O40)] (2) and (H3O)[Ag(L1)2]·2H2O (3) [HL1 = 1-(4-carboxylbenzyl)-3-(pyrazine-2-yl)pyrazole; HL2 = 3-(2-pyrazine)pyrazole], were hydrothermally synthesized and characterized. In compound 1, {K[β-Mo8O26]}n3n− chains fill in the channels of the 3D supramolecular network. In compound 2, HL1 and HL2 coordinate to Ag(I) ions into left- (L) and right-handed (R) helical chains, and (SiMo12O40)4- anions link two neighboring helical chains into a 2D layer structure. The crystal structure of compound 3 is stabilized by hydrogen bonds and π … π interactions, forming a 3D supramolecular network. The luminescent properties of the three compounds have been investigated. In addition, the electrochemical properties of compound 2 have also been investigated.

A new silver-organic coordination polymer, [Ag2L2]n (1) (HL = 5-(2-pyridyl)-1H-tetrazole), was synthesized under hydrothermal conditions. The structure was characterized by single crystal X-ray diffraction, elemental analysis, IR and TGA. In compound 1, the 1D chains are linked into a 3D supramolecular structure via hydrogen bonding and π…π interactions. The luminescent properties have been investigated. Moreover, the antibacterial properties of compound 1 against Gram-positive bacteria and Gram-negative bacteria have also been investigated.

Three new coordination polymers, [Zn(H2biim)(pzdc)]n (1), [Cd(H2biim)(pzdc)]n (2) and [Cd(H2biim)0.5(ip-OH)]n (3) (H2biim = 2,2′-biimidazolate, H2pzdc = 2,3-pyrazinedicarboxylic acid, H2ip-OH = 5-hydroxylisophthalic acid), have been hydrothermally synthesized and characterized by elemental analysis, infrared spectra and X-ray single-crystal diffraction. Complexes 1 and 2 are isostructural and display two-dimensional (2D) undulated layers with 3-connected (4.82) topologies, which are further extended into three-dimensional (3D) supramolecular structures through hydrogen-bonding and C–H⋯π interactions. Complex 3 is a relatively rare 3D compound, featuring a binodal (4,5)-connected (44.62)(44.66) topology. A comparison of all the complexes demonstrates that the structural characteristics of the dicarboxylate ligands play a great role in the modulation of the coordination structures. Moreover, their luminescent properties and thermal stabilities were also investigated.

Biaxially oriented polyester film (BOPET) defect is an important factor affecting the quality of the film. In view of identification of defects in the conventional film production process, this mathod resulted in the identification of defects inaccurate. and low labor efficiency and machine vision recognition on identification of specific defect. This paper presents a LVQ neural network-based BOPET film of defects detection and identification methods. In this algorithm, the film images were processed and the outlines of the membrane defects were obtained. Through extracting the aspect ration, circularity, complexity and elongation , projection histogram central moment and so on, the characteristic values of membrane defects, which from the image of film images after image processing, and then input to the defects recognition system based on LVQ neural network that had been trained, in order to achieve the film defects identification, classification and localization. Through the study of features of the defects in BOPET and extracted some quantities as character input of the LVQ neural network, then input some characteristic values as training value into the LVQ neural network to achieve the learning and prediction purpose, and the LVQ neural network was designed. The experiments show that, the proposed method can meet the requirements analysis of air defects in transparent film.

Six new coordination polymers, [CdCl 2 (bbim)] n ( 1 ), [ZnCl 2 (bbbm)] n ( 2 ), [ZnCl(HCOO)(bbbm)] n ( 3 ), [Cd(PhCOO) 2 (bbim)] n ( 4 ), [Cd(PhCOO) 2 (bbbm)] n ( 5 ), and {[Zn(ip-OH)(bbim)]·DMF} n ( 6 ) [bbim = 1,1′-(1,4-butanediyl)bis(2-methylbenzimidazole), bbbm = 1,1′-(1,4-butanediyl)bis(benzimidazole), H 2 ip-OH = 5-hydroxylisophthalic acid], have been prepared and characterized by elemental analysis, infrared spectra and X-ray single-crystal diffraction. Complexes 1 – 5 have one-dimensional (1D) chain structures. Complexes 1 , 3 and 4 possess similar 1D meso-helical chain structures, which are extended into 2D or 3D supramolecular network through intermolecular hydrogen-bonding, C–H⋯ π and π ⋯ π interactions. Complexes 2 and 5 exhibit similar 1D infinite helical chains. The 1D chains further form a three-dimensional (3D) supramolecular structure through intermolecular hydrogen-bonding and π ⋯ π interactions in 2 , but form a 2D supramolecular layer via C–H⋯ π interactions in 5 . Complex 6 possesses a 2D 4 4 -sql network. Furthermore, luminescent properties and thermal stabilities of 1 – 6 were also investigated.

Four new POM-based hybrid compounds, namely, [Cu2(L1)3(H2O)2(P2W18O62)]·H2L1·4H2O (1), [Cu3(L2)6(P2W18O62)] (2), [Cu3(L3)5(H2O)(P2W18O62)]·4H2O (3) and [Cu3(L4)4(H2O)7(P2W18O62)]·26H2O (4) (L1 = 1,3-bis((1H-1,2,4-triazol-1-yl)methyl)benzene, L2 = 1,3-di(1H-1,2,4-triazol-1-yl)propane, L3 = 2-(1H-imidazol-2-yl)pyridine and L4 = 4-(1H-tetrazol-5-yl)pyridine), have been prepared under hydrothermal conditions. Compound 1 shows a three-dimensional (3D) framework with trinodal (4,4,6)-connected (3·42·5·66·72·83)(3·42·52·6)(3·42·62·7) topology. Compound 2 exhibits an unprecedented 3D framework with binodal (6,6)-connected SQC-888 topology. Compound 3 displays a two-dimensional (2D) structure with the existence of 2D → 3D interdigitation. In compound 4, {P2W18O62}6− is mono-supported by the linear tri-copper cluster {Cu3(H2O)L4}6+. In addition, the electrochemical properties and magnetic properties of 1–4 have also been studied.

Voice activity detection (VAD) is the key of voice recognition, voice synthesis and speech-sound enhancement.For the sake of improve the accuracy and robustness of speech endpoint detection system. Combining the advantages of adaptive genetic algorithm (AGA) and improved radial basis function network (RBF) defects in existing learning methods. This paper presents a comprehensive detection method-- Adaptive genetic algorithm radial basis function network. This method uses adaptive genetic algorithm to simultaneously optimize the center, the width and the structure of RBF network. The method using wavelet analysis to extract the characteristics of the speech signal, use them as an input amount to the radial basis function networks. Establish voice detection system model, this method enhance the accuracy of the detection system and has better robustness.

The classification of imbalanced data is one of the most challenging problems in data mining and machine learning research. Imbalanced dataset is a form that exists in reality area, which describes truly and objectively the essential characters of something. There will appear paucity of data and flooded in the classification of imbalanced dataset. Beside problems such as loss of information and data splitting phenomenon will also appear when using the traditional machine learning methods. So how to solve the classification problem of imbalanced data will be challenging. In this paper, aiming at the above problems, a classification algorithm based on AdaBoost-SVM is proposed. In the experiments with four typical forms of imbalanced data sets in UCI were validated the effectiveness of this strategy.

In coded-structured light three dimensional system, system calibration plays a vital role for the measurement accuracy. The camera calibration method is very mature, but the study about projector calibration is less. Therefore, this paper proposes a projector calibration method with simple calibration process and high accuracy. This method combines the Zhang’?s plane model calibration method with orthogonal phase shift coding. In calibration process, this paper uses phase shift coding pattern to establish the relationship of projector image and camera corner point coordinates. According to the image coordinates in the projector’?s perspective, we program and calculate the projector’?s internal and external parameters matrix based on the Zhang’?s plane model calibration toolbox. The results show that the proposed method is simple and flexible, the maximum relative error of the calibration parameters is 0.03%, and it meets the requirements of system calibration in medical or industrial fields.

Semantic feature modeling is an important research topic in CAD, in which geometric constraints in model are solved automatically. A semantic feature modeling method is given in this paper. Firstly, the feature dependent graph is built based on geometric constraints. Secondly, the feature dependent graph is decomposed according to the complexity of subgraphs and the whole problem of solving geometric constraints is divided into several small ones. Thirdly, these small problems are solved. At the same time, the modeling architecture based on the decomposition of feature dependent graph is given. Experimental results show that when the proposed method is applied, the modeling performance is improved.

This paper presents a SVM classification method based on cluster boundary sampling and sample pruning. We actively explore an effective solution to solve the difficult problem of imbalanced data set classification from data re-sampling and algorithm improving. Firstly, we creatively propose the method of cluster boundary sampling, using the clustering density threshold and the boundary density threshold to determine the cluster boundaries, in order to guide the process of re-sampling more scientifically and accurately. Secondly, we put forward a new sample pruning algorithm based on dynamic threshold KNN to deal with the complexity and overlapping problem of imbalanced data set. The phenomenon of data complexity and overlapping will reduce the classification performance and generalization ability of SVM classifier. Experiments show that our method acquires obviously promotion effect in various different imbalanced data sets and it can prove the validity and stability.

Semantic feature modeling is a new trend of CAD technology. It is very important for modifying and editing models automatically and semi-automatically. In this paper, a semantic feature modeling method is proposed, in which geometric constraints of models are solved. The new method is history-independent. At the same time, the architecture of semantic feature modeling is given. According to the principles of 3 dimensional rigid bodies, basic geometric constraints can be expressed. Experiment results show an instance modeled by the proposed method.

A novel noncentrosymmetric coordination polymer, namely, [Cd2L(H2O)2]·solvent (1) (H4L = tetrakis[4-(carboxyphenyl)oxamethyl]methane acid), has been successfully solvothermally synthesized and characterized by signal-crystal X-ray diffraction, IR spectra, element analysis, powder X-ray diffraction and thermogravimetric analysis. The structure study shows that 1 exhibits a 3D framework based on 1D carboxylate-metal chains. Furthermore, 1 contains three types of helical chains along the c axis. From a topological perspective, 1 can be reduced to a new self-catenated binodal (4,6)-connected (66)(615) topology. In addition, the second-order nonlinear optical and fluorescent properties of 1 have also been investigated.

Five new inorganic–organic hybrids based on 4,4′-bipyridine and Keggin-type polyoxometalate [SiMo12O40]4−, (SiMo12O40)(H2bipy)2·2H2O (1), [Cu(Hbipy)4(HSiMo12O40)(SiMo12O40)](H2bipy)0.5·7H2O (2), [Cu2(Hbipy)6(bipy)(SiMo12O40)3](Hbipy)2·6H2O (3), [Cu(bipy)2(SiMo12O40)](H2bipy)·2H2O (4) and [Cu2(bipy)4(H2O)4](SiMo12O40)·13H2O (5) (bipy=4,4′-bipyridine), have been hydrothermally synthesized. 1 consists of H2bipy2+ and [SiMo12O40]4− units. In 2, two [SiMo12O40]4− are bridged by [Cu(Hbipy)4]6+ to form a [Cu(Hbipy)4(SiMo12O40)2]2− dimmer. In 3, [SiMo12O40]4− polyanions acting as bidentated bridging ligands and monodentated auxiliary ligands connect [Cu2(Hbipy)6(bipy)]8+ units into a 1D zigzag chain. In 4, [SiMo12O40]4− polyanions bridge neighboring 1D [Cu(bipy)2]2+ double chains into a 2D extended layer. In 5, [SiMo12O40]4− polyanions acting as templates site alternately upon the grids from both sides of the square grid [Cu2(bipy)4(H2O)4]4+ layer. In addition, the electrochemical behaviors of 1, 3 and 4 and the photocatalysis property of 1 have been investigated.

Two novel entangled POM-based coordination polymers (CPs), namely [Co2(L)5(H2O)2(SiW12O40)] (1) and [Cu2(L)3(H2O)2(SiW12O40)]·H2O (2) (L = 4,4′-bis((1H-1,2,4-triazol-1-yl)methyl)biphenyl), have been hydrothermally synthesized. Compound 1 presents an unprecedented 2D + 2D → 3D polypseudorotaxane motif. The fascinating self-catenated framework of compound 2 contains three types of helical chains. In addition, the photocatalytic properties of compounds 1 and 2 have also been investigated.

A new MOF based on hetero pentanuclear clusters, [(CH3)2NH2]1.66[Cd1.84Na0.66(BDC)3]·DMF·0.5EtOH (1), has been prepared. Iodine adsorption studies reveal that 1 can reversibly adsorb iodine. Furthermore, electrochemical impedance spectroscopy (EIS) of 1⊃I2 shows that it has a relatively high conductivity at room temperature.

One new coordination polymer based on 4-[(8-hydroxy-5-quinolinyl)azo]-benzoic acid(H2L), {[CdL(H2O)]·H2O}n (1) was solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction, infrared spectrometry, elemental analysis, powder X-ray diffraction(PXRD) and thermogravimetric analysis (TGA). In compound 1, L2− ligands link Cd(II) to form a sinusoidal ruffling layer, in which the carboxylic groups connect Cd(II) into an infinite Cd—O chain. And the layers are further stabilized by hydrogen bonding and π…π interactions, forming a three-dimensional(3D) supramolecular network. In addition, the fluorescent property of compound 1 was also investigated.

Two new supramolecular compounds, [Cd(H 2 PIDC) 2 (H 2 O)]·H 2 O ( 1 ) and {[Cd(H 2 PIDC) 2 (H 2 O)]·2H 2 O} n ( 2 ) (H 3 PIDC = 2-(pyridine-2-yl)-1H-imidazole-4,5-dicarboxylic acid), have been synthesized under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction. Compound 1 contains discrete mononuclear structure, and compound 2 consists of one-dimensional left- and right-helix chains. Both are constructed into high-dimensional supramolecular frameworks by strong non-covalent hydrogen bonding and π ⋯ π stacking interactions. In addition, they were characterized by IR and elemental analysis, and their fluorescence properties in the solid state at room temperature have also been investigated.

Three lead coordination polymers, [PbCl(C10H6N3O4)(H2O)·H2O]n (1), [Pb(C10H6N3O4)2(H2O)]n (2) and [Pb3(C10H5N3O4)3]n (3) (C10H7N3O4=2-(pyridin-2-yl)-1H-imidazole-4,5-dicarboxylic acid), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. In 1, Cl anions connected neighboring wave-like 2D layers, which are constructed with left- and right-handed helical chains, into a 3D network structure with a (63)(65·8) topology. In 2, Pb cations are linked into a 3D 66 network with left- and right-handed helixes by μ2-bridging C10H6N3O4− ligands. In 3, C10H5N3O42− ligands link Pb6O12 clusters into a 3D (412·63) network. Their fluorescent properties were also investigated.

This paper presents an ETL system for a data warehouse designed for a PVC profile manufacturing enterprise. The system implements the data extraction, data transformation and load from the data sources of ERP system, CRM system and production line operation data collection system. The ETL requirements are discussed. The system design and implementation methods, including system structure, functions, data processing methods as well as tray program implementation are addressed.

A rare 4-connected neb framework, [Zn(L)(bpmp)] n (H2L = 4,6-dibenzoylisophthalic acid; bpmp = N,N′-bis(4-pyridyl-methyl)piperazine), has been synthesized under hydrothermal conditions and characterized by powder X-ray diffraction, IR, elemental analysis, and single crystal X-ray diffraction. The complex exhibits a rare threefold interpenetrating neb framework and displays double right- and left-handed helical chains. The luminescence property of the complex has also been studied.

Two novel inorganic–organic hybrid compounds based on α-Keggin {PMo12O40} (PMo12) clusters, [CuI(bim)2]2{[CuII(bim)2]2[PMoVI9MoV3O40]} (1) and [CuI(mim)2]4[PMoVI11MoVO40]·H2O (2) (bim = benzimidazole, mim = 2-methylimidazole), have been hydrothermally synthesized and characterized by single crystal X-ray diffraction, IR spectrum, PXRD, elemental and TG analyses. Single crystal X-ray diffraction analyses reveal that both the two three-dimension (3D) supramolecular structures include left- and right-handed helical chains formed by modified polyoxometalate (POM) clusters via hydrogen bonds. 1 is an unusual bicapped Keggin compound with two Cu atoms as caps connecting with the POM via four bridging oxygen atoms, respectively. 2 is a tetrasupporting compound based on PMo12 cluster modified by four [CuI(mim)2]+ fragments. Photocatalytic activities of the two compounds have also been investigated in this paper.