检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2005年第12期24卷 1403-1407页

作者： YANG Jian-Guo PAN fu-you Office of Assets Administration Taizhou University Zhejiang 317000 China Department of Chemistry Taizhou University Zhejiang 317000 China

The title compound C15H12N4O2S was synthesized by the reaction of 3-（2-hydroxybenzyl）-4-amino-（1H）-1,2,4-triazole-5-thione with 4-hydroxybenzaldehyde in ethanol and characterized by IR, ^1H NMR spectra and elemental analysis. Its structure has been determined by X-ray diffraction analysis. The crystal belongs to monoclinic, space group C2/c with a = 27.990（3）, b = 13.1326（14）, c = 7.9770（8） A, β= 105.787（2）°, V = 2821.6（5）A^3, Z = 8, Mr= 312.35,μ= 0.243 mm^-1, Dc = 1.471 g/cm^3 and F（000） = 1296. The structure was solved by direct *** refined to a Rint value of 0.0388. The crystal structure involving in intermolecular N-H…S and O-H…S hydrogen bonds is observed, meanwhile intramolecular O-H…N hydrogen bond is also found. Their biological activities have been measured. The results show that this type of compound has certain antibacterial activity for Staphylococous aureus and Bacillus subtilis.

关键词： 1,2,4-triazole-5-thione X-ray diffraction crystal structure,synthesis antibacterial activities

Bioprinting and in vitro characterization of alginate dialdehyde-gelatin hydrogel bio‑ink

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2020年第1期3卷 48-59页

作者： fu you Xia Wu Michael Kelly Xiongbiao Chen Division of Biomedical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada Department of Neurosurgery College of MedicineUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada Department of Mechanical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada

Cell-laden cardiac patches have recently been emerging to renew cellular sources for myocardial infarction(MI,commonly know as a heart attack)***,the fabrication of cell-laden patches with porous structure remains challenging due to the limitations of currently available hydrogels and existing processing *** present study utilized a bioprinting technique to fabricate hydrogel patches and characterize them in terms of printability,mechanical and biological ***-laden hydrogel(or bio-ink)was formulated from alginate dialdehyde(ADA)and gelatin(GEL)to improve the printability,degradability as well as *** groups of hydrogel compositions were designed to investigate the influence of the oxidation degree of ADA and hydrogels concentration on the properties of printed ***-GEL hydrogels have generally shown favorable for living cells(***926 cells and hybrid human umbilical vein endothelial cell line).The hydrogel with an oxidation degree of 10%and a concentration ratio of 70/30(or 10%ADA70-GEL30)demonstrated the best printability among the groups *** hydrogels were also bioprinted with the living cells(***926),and the scaffolds printed were then subject to the cell culture for 7 *** results illustrate that the scaffolds bioprinted from 10%ADA70–GEL30 hydrogels had the best homogenous cell distribution and also the highest cell *** together,in the present study we synthesized a newly formulated bio-ink from ADA and GEL and for the fist time,used them to bioprint cardiac patches,which have the potential to be used in MI repair.

关键词： Bioprinting Alginate dialdehyde Gelatin Bio-ink

Ordering polygonal chains with respect to Hosoya index

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2012年第3期27卷 305-319页

作者： QIAO you-fu ZHAN Pu-qin Department of Mathematics Hechi UniversityYizhou 546300China

The Hosoya index of a graph is defined as the total number of the matching of the graph. In this paper, the ordering of polygonal chains with respect to Hosoya index is characterized.

关键词： Hosoya index matching polygonal chain

Generalized Multi-component TC Hierarchy and Its Multi-component Integrable Coupling System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第5X期44卷 793-798页

作者： XIA Tie-Cheng you fu-Cai Department of Mathematics Shanghai University Shanghai 200444 China

A new 3M-dimensional Lie algebra X is constructed firstly. Then, the corresponding loop algebra X is produced, whose commutation operation defined by us is as simple and straightforward as that in the loop algebra *** follows that a generalscheme for generating multi-component integrable hierarchy is proposed. By taking advantage of X, a new isospectral problem is established, and then well-known multi-component TC hierarchy is obtained. Finally,an expanding loop algebra FM of the loop algebra X is presented. Based on the FM, the multi-component integrable coupling system of the generalized multi-component TC hierarchy has been worked out. The method in this paper can be applied to other nonlinear evolution equations hierarchies. It is easy to find that we can construct any finite-dimensional Lie algebra by this approach.

关键词： loop algebra multi-component TC hierarchy multi-component integrable coupling system

Synthesis, Crystal Structure and Antibacterial Activities of 3-[3-Methyl-(2-thienyl)methyl- enehydrazinocarbonyl]-(1H)-1,2,4-triazole

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第11期24卷 1286-1289页

作者： YANG Jian-Guo PAN fu-you SHAO Hong Office of Assets Administration Taizhou University Zhejiang 317000 China Department of Chemistry Taizhou University Zhejiang 317000 China

The title compound, C9H9N5OS, was synthesized by the reaction of 3-（1H）-1,2,4 -triazole hydrazine with 3-methyl-2-thiophenecarboxaldehyde in ethanol. The single crystal structure has been determined by X-ray diffraction analysis. The crystal belongs to monoclinic system, space group P2 1/n with a = 9.5550（10）, b = 11.9847（12）, c = 10.1074（11） A,β= 112.995（2）° V= 1065.47（19） A^3, Z = 4,μ = 0.290 mm^-1, Mr= 235.27, Dc = 1.467 g/cm^3 and F（000） = 488. The structure was solved by direct methods and refined to R = 0.0449. The crystal structure involves intermolecular hydrogen bonds of N-H…O and N-H…N as well as intramolecular hydrogen bond of N-H…N. Its biological activity has also been determined showing this type of compounds has certain antibacterial activity.

关键词： synthesis crystal structure antibacterial activities (1H)-1,2,4-triazole

Mechanism of hydro-viscous soft start of belt conveyor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第3期18卷 459-465页

作者： MENG Qing-rui HOU you-fu School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The mechanism of a hydro-viscous soft start is of great importance in the design of a hydro-viscous clutch and its control system. To explain the mechanism of a hydro-viscous soft start, the startup process of a belt conveyor was numerically analyzed with the modified Reynolds equation, an energy equation and a temperature-viscosity equation. The effect of temperature and grooves of the friction disk surface on torque transfer and load capacity of the oil film have also been analyzed. The results show that 1) the grooves are the basis of forming dynamic pressure but they may reduce the capacity of torque transfer to a certain extent, 2) during the startup process, temperature has little effect on torque transfer and load capacity and the variation in load capacity of the oil film is very small, indicating that it is preferable to use the flow rate as a control object than the pressure of the feed cylinder. The results have been verified by an experiment.

关键词： hydro-viscous clutch soft start belt conveyor torque transfer load capacity

Dynamic characteristics of conveyor belts

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第4期18卷 629-633页

作者： HOU you-fu MENG Qing-mi School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

The dynamic characteristics of a belt conveyor are determined to a large extent by the properties of the belt. This paper describes experiments designed to establish the dynamic properties of belting material. The dynamic elastic modulus, viscous damping and rheologicat constants of the belt were measured. Several properties were studied as a function of the tensile loading on the belt. These included longitudinal vibration, the natural vibration frequency in the transverse direction and the response to an impulse excitation. Vibration response was observed under several different excitation frequencies. Most of these properties have not been tested previously under conditions appropriate for the ISO/DP9856 standard. Two types of belt were tested, a steel reinforced belt and a fabric reinforced belt. The test equipment was built to provide data appropriate for designing belt conveyors. It was observed that the stress wave propagation speed increased with tensile load and that tensile load was the main factor influencing longitudinal vibrations.

关键词： experimental investigation dynamic characteristics conveyor belt

Multi-component Levi Hierarchy and Its Multi-component Integrable Coupling System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第6X期44卷 990-996页

作者： XIA Tie-Cheng you fu-Cai ZHAO Wen-Ying Department of Mathematics Shanghai University Shanghai 200444 China Department of Mathematics Bohai University Jinzhou 121000 China

A simple 3M-dimensional loop algebra X is produced, whose commutation operation defined by us is A1 as simple and straightforward as that in the loop algebra A1. It follows that a general scheme for generating multi-component integrable hierarchy is proposed. By taking advantage of X, a new isospectral problem is established, and then by making use of the Tu scheme the well-known multi-component Levi hierarchy is obtained. Finally, an expanding loop algebra FM of the loop algebra .X is presented, based on the FM, the multi-component integrable coupling system of the multi-component Levi hierarchy is worked out. The method in this paper can be applied to other nonlinear evolution equation hierarchies.

关键词： loop algebra multi-component Levi hierarchy multi-component integrable coupling system

Synthesis, Characterization, Crystal Structure and Antibacterial Activities of a Nickel(Ⅱ) Complex with 2'-(2-Thienylidene)-hydroxybenzoylhydrazide

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第9期26卷 1071-1075页

作者： YANG Jian-Guo LI Fang PAN fu-you JIA Wen-Ping Office of Assets Administration Taizhou University Taizhou 317000 China Department of Chemistry Taizhou University Taizhou 317000 China

In the ethanol solvent, a nickel（Ⅱ） complex Ni（C12H10N2O2S）2 upon reaction of 2＇-（2-thienylidene）-hydroxybenzoylhydrazide with nickel acetate was synthesized, and its structure was characterized by IR, UV, elemental analysis and X-ray diffraction analysis. The crystal belongs to monoclinic system, space group C2/c with a = 22.052（3）, b = 5.9681（6）, c = 18.522（2）A , β = 110.679（4）°, V = 2280.6（4）A^3, Z = 4, Mr = 551.27, μ = 1.606 mm^-1, Dc = 1.075 g/cm^3, F（000） = 1136 and Rint = 0.0556. The nickel（Ⅱ ） atom in the compound is four-coordinated with two nitrogen atoms from amide and two oxygen atoms from keto group. The biological activities have been measured, show- ing the compound exhibits better anti-bacterial activity than the ligand.

关键词： nickel(Ⅱ) complex 2'-(2-thienylidene)-hydroxybenzoylhydrazide,crystal structure antibacterial activities

Synthesis, Crystal Structure and Antibacterial Activities of 3-[(2-Hydroxy-4-diethylamino-phenyl)methylenehydrazinocarbonyl]-4-hydroxy-6-methyl-2(1H)-pyridinones

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第5期25卷 626-630页

作者： LI Fang PAN fu-you YANG Jian-Guo GE Chang-Hua Department of Chemistry Taizhou University Zhejiang 317000 China Office of Assets Administration Taizhou University Zhejiang 317000 China

The title compound C18H22N4O4 was synthesized by the reaction of 3-hydrazine-4-hydroxy-6-methyl-2（1H）-pyridinones with 2-hydroxy-4-diethylaminobenzaldehyde in ethanol and characteri- zed by IR, tH NMR and elemental analysis. The single-crystal structure has been determined by X-ray diffraction analysis. The crystal belongs to the triclinic system, space group P1^- with a = 10.1930（14）, b = 12.5200（17）, c = 15.1863（19） A, α= 96.292（3）, β= 96.450（3）, γ= 102.443（3）°, V= 1862.6（4） A^3, Z= 4, Mr = 358.40, μ = 0.092 mm^-1, D c= 1.278 g/cm^3, F（000） = 760 and R = 0.0803. The crystal structure involves intermolcular N-H…O as well as intramolcular O-H…N, O-H…O and N-H…O hydrogen bonds. The title compound shows no antibacterial activity.

关键词： 2(1H)-pyridinones X-ray diffraction crystal structure synthesis antibacterial activities