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Impacts of freezing and thermal treatments on dimensional and mechanical properties of wood flour-HDPE composite

Journal of Forestry Research 2013年第1期24卷 143-147页

作者： YANG Wei-jun XIE Yan-jun WANG Hai-gang LIU Bao-yu WANG Qing-wen Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) Northeast Forestry University

Wood plastic composite （WPC） of wood flour （WF）, high density polyethylene （HDPE）, maleic anhydride-grafted polyethylene （MAPE） and lubricant was prepared by extrusion, and then exposed to different temperatures to evaluate the effects of freezing and thermal treatment on its dimensional and mechanical properties. At elevated temperatures, WPC expanded rapidly initially, and then contracted slowly until reaching an equilibrium state. Treatment at 52°C and relative humidity of 50% for 16 days improved the mechanical properties of WPC： flexure, tensile strength, and izod unnotched impact strength increased by 8%, 10% and 15%, respectively. Wide-angle X-ray diffraction （XRD） tests showed that the degree of crystalization of HDPE in WPC declined with increasing treatment temperature.

关键词： wood plastic composite freezing treatment thermal treatment dimension mechanical properties X-ray diffraction

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Reinforcing effects of modified Kevlar~ fiber on the mechanical properties of wood-flour/polypropylene composites

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Journal of Forestry Research 2013年第1期24卷 149-153页

作者： YUAN Fei-pin OU Rong-xian XIE Yan-jun WANG Qing-wen Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) Northeast Forestry University

Kevlar fiber （KF） is a synthesized product with strong mechanical properties. We used KF as a reinforcement to improve the mechanical properties of wood-flour/polypropylene （WF/PP） composites. KF was pretreated with NaOH to improve its compatibility with the thermoplastic matrix. Maleated polypropylene （MAPP） was used as a coupling agent to improve the interfacial adhesion between KF, WF, and PP. Incorporation of KF improved the mechanical properties of WF/PP composites. Treatment of KF with NaOH resulted in further improvement in mechanical strength. Addition of 3% MAPP and 2% hydrolyzed KF （HKF） led to an increment of 93.8% in unnotched impact strength, 17.7% in notched impact strength, 86.8% in flexure strength, 50.8% in flexure modulus, and 94.1% in tensile strength compared to traditional WF/PP composites. Scanning electron microscopy of the cryo-fractured section of WF/PP showed that the HKF surface was rougher than the virgin KF, and the KF was randomly distributed in the composites, which might cause a mechanical interlocking between KF and polypropylene molecules in the composites.

关键词： Wood flour/Polypropylene composite Kevlar fiber hydrolysis reinforcement impact strength

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Geometry Structures, Metal-metal Bond and Electronic Spectra of Ferromagnetic Dimeric Rutheinium Porphyrazine

Geometry Structures, Metal-metal Bond and Electronic Spectra...

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第十二届全国量子化学会议

作者： Jin-Yu Lv Ming-Jing Zhang Qing-Jiang Pan Yuan-Ru Guo Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Key Laboratory of Bio-based Material Science & Technology of Education MinistryCollege of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

Dimeric(RuPz)2 complex,modeling experimentally known dimers of(RuPor)2 and(RuPc)2,as well as its monomeric RuPz have been investigated using density functional theory[1].Pz,Por and Pc denote porphyrazine,porphyrin and phthalocyanine,*** was shown that(RuPz)2 favors a Pz-Pz staggered conformer with the skew angle(N-Ru-Ru-N)= 33.3° rather than an eclipsed one,which is compared with experimental values of measured 23.8° for(RuOEPor)2 and assumed 45° for(RuPc)*** of the staggered(RuPz)2 in all the possible electron-spin states as well as the RuPz were fully *** was revealed that the(RuPz)2 has a ferromagnetic triplet ground state,being 6.3 kcal/mol lower than its diamagnetic singlet state,and 11.3~79.1 kcal/mol more stable than other *** confirms experimentally reported(RuOEPor)2 and(RuPc)2 with magnetic moment of 2.5~2.8 μ*** Ru-Ru bond length of(RuPz)2 in the triplet state was optimized to be 2.38(A),close to experimental values of 2.40~2.41(A).The nature of Ru-Ru double bond has been evidenced by the calculated Ru-Ru stretching vibrational frequency of 202 cm-1 and bond energy of 30.7 kcal/mol(BSSE)at the theory level of larger basis *** with the continuum model,electronic spectra of(Py2RuPz),(PyRuPz)2 and(RuPz)2 which represent case of RuPz in the dilute solution,the concentrated solution and the solid state have been calculated and discussed in the work.

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Theoretical study on tetrapyrrolic ruthenium(Ⅱ) isothiocyanato complexes

Theoretical study on tetrapyrrolic ruthenium(Ⅱ) isothiocyan...

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第十二届全国量子化学会议

作者： Ming-Jing Zhang Qing-Jiang Pan Yuan-Ru Guo Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Key Laboratory of Bio-based Material Science & Technology of Education MinistryCollege of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

The Ru(II)sensitizers,[((HOOC)n-(Pc))Ru(NCS)2]2-(labeled as Pc-n; n = 0-4,Pc = phthalocyanine)and [((HOOC)n-(TBPor))Ru(NCS)2]2-(Por-n; n = 0-4,TBPor = tetrabenzoporphyrin),for solar cells have been studied on their optoelectronic and redox properties using density functional theory(DFT)and time-dependent DFT(TD-DFT).The number of carboxylic groups bonding to tetrapyrrolic ligands can fine-tune electronic structures and absorption *** tetrapyrrolic macrocycles are the ideal spot to accommodate excited *** on both atomic electron-spin density and electronic structures reveal that one-electron oxidation of Pc-n and Por-n occurs around ruthenium and-NCS moieties; in contrast,that of [(Pc)Ru(Py-COOH)2](PcRuPy,Py = pyridine)was calculated to be macrocycle-based,agreeing with experimental ***,intensities of Q absorption bands of Pc-n and Por-n have been calculated to be strongly enhanced upon increasing the carboxylic acid *** brief,the present calculated results of electronic structures,spectral features and oxidation potentials as well as comparison with experimentally known dyes of PcRuPy and N3[1] suggest that Pc-n and Por-n,especially Por-4,would be suitable photosensitizers for dye-sensitized solar cells(DSSCs).

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Structural, Electronic and Spectroscopic Properties of bis-imido Uranium Iodides: An Implication for Chirality of Inorganic Complex

Structural, Electronic and Spectroscopic Properties of bis-i...

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第十二届全国量子化学会议

作者： Chun-Mei Lv Qing-Jiang Pan Yuan-Ru Guo Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Key Laboratory of Bio-based Material Science & Technology of Education MinistryCollege of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

To provide an insight into chirality of inorganic complexes,cis-bis(imido)uranium iodides,cis-U(NPh)2(THF)3I2(3Ph1 and 3Ph2)and cis-U(NPh)2(THF)2I2(2Ph1 and 2Ph2)have been examined using density functional theory(DFT)and time-dependent *** system energies,geometry parameters and vibrational spectra were calculated to be close between respective *** difference of U=N *** on electronic structures in the tetrahydrofuran solution reveal that these mirror complexes show mixed π(U=N)and π(Ph)character for HOMO and HOMO-1; lone pair electrons of iodine are dominant in energetically lower occupied *** orbital energies were calculated to be slightly different between enantiomers,which causes difference in corresponding electronic transitions and is further reflected in electronic *** calculated exciton-coupled circular dichroism(ECCD)spectra of 2Ph1 and 2Ph2 exhibit a complete mirror *** also calculated experimentally known trans-U(NPh)2(THF)3I2(trans-3Ph).The comparison among calculated results of trans-3Ph,3Ph1 and 3Ph2 indicates that the cis/trans-isomerism affects their structural and electronic properties more significantly than the chirality.

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Structural, electronic and energetic properties of a series of mono- and bisuranyl dihalides equatorially coordinated by N/O ligands: a relativistic density functional study

Structural, electronic and energetic properties of a series ...

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第十二届全国量子化学会议

作者： Yong-Ming Wang Qing-Jiang Pan Yuan-Ru Guo Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Key Laboratory of Bio-based Material Science & Technology of Education MinistryCollege of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

Monometallic(UO2)(X)2(L)3(L = pyridine(py),X = F(1),Cl(2),Br(3)and I(4); L = tetrahydrofuran(thf),X = Cl(5); L = pyrrole(pl),X = Cl(6))as well as bimetallic [(UO2)(μ2-X)(X)(L)2]2(L = py,X = F(7),Cl(8),Br(9)and I(10); L = thf,X = Cl(11); L = pl,X = Cl(12))were examined using relativistic density functional *** changing from F,Cl,Br to I irregardless of in mono-or bisuranyl complexes,bond lengths of U=O were calculated to be decreasing,which results from strengthening of axial U=O bonds while weakening of equatorial X→U *** present study reveals that all the complexes have U(f)-character low-lying unoccupied orbitals,and their π*(U=O)antibonds are located on higher-energy ***,energetic properties of formation reactions of above complexes were calculated and also compared with available experimental results.

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Theoretical studies on Redox Potentials of the classic equatorial coordination AnⅥ/AnⅤ complexes for An = U, Np, Pu

Theoretical studies on Redox Potentials of the classic equat...

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第十二届全国量子化学会议

作者： Yu-Xi Zhong Qing-Jiang Pan Yuan-Ru Guo Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Key Laboratory of Bio-based Material Science & Technology of Education MinistryCollege of Material Science and EngineeringNortheast Forestry UniversityHarbin 150040China

The structures and property of {AnO2(H2O)5}2+/{AnO2(H2O)5}+ for An = U,Np,Pu have been calculated using density function theory.[1] [2] On the basis of these work,we explored other AnVI/AnV complexes structures and redox potentials and try to frontier orbital diagrams to explain the changing trends of redox *** have found that different computational method has great influence on redox potentials and the solvent effect on potential changes very little.

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A prediction model of pigment formulation for wood dyeing based on improved RBF neural network

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International Journal of Applied Mathematics and Statistics 2013年第15期45卷 87-94页

作者： Guan, Xuemei Guo, Minghui College of Mechanical and Electrical Engineering Northeast Forestry University Harbin 150040 China Key Lab. of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin 150040 China

Since RBF neural network is likely to converge to local minimum and has low learning efficiency, we proposed an improved neural network in this paper. Our proposed network transmit the output of the hidden node to its input, which take both hidden layer output and input layer output as the input of the hidden layer. The new network can do more precisely training and reduce network error. What more, we also proposed a simplified identification method based on central point and radial niche width to solve the problem of the huge calculation in improved network. We use the softwood (Pinus Sylvestris) as our research subject, considered tristimulus values before dyeing as network input and tristimulus values after dyeing as network output, and then established models using the improved algorithm. Result shows that the improved model could obviously accelerated prediction speed and modified generalization ability. © 2013 by CESER Publications.

关键词： Radial basis function networks

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The optimized design of manufacturing process of shrub scrimber

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Advanced materials Research 2013年 712-715卷 597-600页

作者： Li, Yan Fang Hu, Ying Cheng Zhang, Li Yao, Jia Yuan, Jie Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry University 150040 Harbin China College of Material Science and Engineering Northeast Forestry University 150040 Harbin China College of Mechanical Engineering Jiamusi University 154007 Jiamusi China

ISBN: (纸本)9783037857243

In this study, the optimized manufacturing process of Shrub Scrimber has been researched by using orthogonal experiment. The dynamic mechanical properties of Shrub Scrimber were measured by Fast Fourier Transform (FFT) nondestructive testing method, and the reliability of this method was verified by the linear regression between the static mechanical properties and the dynamic one. The results showed that shrub Scrimber had excellent mechanical properties, and can be used as structure replaced natural wood. The flexural vibration test were confirmed reliable to predict the mechanical properties of Shrub Scrimber. © (2013) Trans Tech Publications, Switzerland.

关键词： Fast Fourier transforms

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Potential products and separation processes for pre-hydrolysis liquor of kraft-based dissolving pulp process: A review

J-FOR

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J-FOR 2013年第6期3卷 39-47页

作者： Shen, Jing Fatehi, Pedram Ni, Yonghao Chemical Engineering Department Lakehead University 955 Oliver Road Thunder BayON Canada Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Material Science and Engineering College Northeast Forestry University Harbin150040 China Limerick Pulp and Paper Centre and Department of Chemical Engineering University of New Brunswick FrederictonNB Canada

Production of dissolving pulp by means of the Kraft process has received much attention these days in Canada. In this process, wood chips are pretreated with steam before Kraft pulping. This steaming leads to dissolution of part of the lignocelluloses in the wood chips in the prehydrolysis liquor (PHL). The PHL contains 5%-8% lignocelluloses that can potentially be used to produce value-added chemicals, and methane has been commercially produced from PHL. However, the dilute nature of PHL may hinder its direct utilization in producing certain value-added chemicals. To accommodate lignocelluloses from PHL economically, they should be first isolated from the PHL. In this paper, various processes developed for isolating lignocelluloses from PHL and using them to produce value-added chemicals are reviewed. Acidification and solvent extraction can be used to extract lignin and hemicelluloses respectively from PHL. laboratory analysis of adsorption and flocculation processes showed promising results for isolating lignocelluloses from PHL, and their products could be used as modified fillers in board production, as fuel, or as raw material for producing bio-oil, for example. The main challenge in the production of acetic acid and furfural is the development of a viable separation process for lignocelluloses from PHL which can be integrated into the existing facilities of the Kraft process. © 2013, Pulp and Paper Technical Association of Canada. All rights reserved.

关键词： Lignocellulose

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