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Photocatalytic Synthesis of Hydrocarbon Oxygenates from C_2H_6 and CO_2 over Pd-MoO_3/SiO_2 Catalyst

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Journal of Natural Gas Chemistry 2007年第2期16卷 173-178页

作者： Xitao Wang zhong He Shunhe zhong Xiufen xiao College of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Pd-MoO3/SiO2 catalyst has been prepared using the method of incipient wetness impregnation. The photo absorbing behaviors and chemisorbing properties of the catalyst have been characterized by UV-vis spectra and TPD-MS experiments. The results indicated that metal Pd loaded on MoOa/SiO2 has a significant effect on the photo absorbing performance of MoOa/SiO2, and an obvious blue shift of the absorption edge is produced. Under UV irradiation, the chemisorption state of CO2 undergoes decomposing process to form CO at 481 K, and a two-site adsorption state of ethane can be formed at around 496 K. Photo-oxidation of ethane using carbon dioxide can mainly produce propanal, ethanol and acetaldehyde in the temperature range of 353-423 K. The presence of metal Pd improves the catalytic activity remarkably.

关键词： photo-catalysis carbon dioxide ethane hydrocarbon oxygenates Pd-MoOa/SiO2 catalyst

Enhanced Thermal Conductivities of Liquid Crystal Polyesters from Controlled Structure of Molecular Chains by Introducing Different Dicarboxylic Acid Monomers

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Research 2022年第4期2022卷 507-517页

作者： xiao zhong Kunpeng Ruan Junwei Gu Research Development Institute of Northwestern Polytechnical University ShenzhenGuangdong 518057China Shanxi Key Laboratory of Macromolecular SCcience and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxi 710072China

Enhancing thermal conductivity coefficient (λ) of liquid crystal polyesters would further widen their application in electronics and electricals. In this work, a kind of biphenyl-based dihydroxy monomer is synthesized using 4, 4’-biphenyl (BP) and triethylene glycol (TEG) as raw material, which further reacts with three different dicarboxylic acids (succinic acid, p-phenylenediacetic acid, and terephthalic acid, respectively) by melt polycondensation to prepare intrinsically highly thermally conductive poly 4’, 4”’-[1, 2-ethanediyl-bis(oxy-2, 1-ethanediyloxy)]-bis(p-hydroxybiphenyl) succinate (PEOS), poly 4’, 4”’-[1, 2-ethanediyl-bis(oxy-2, 1-ethanediyloxy)]-bis(p-hydroxybiphenyl) p-phenyldiacetate (PEOP) and poly 4’, 4”’-[1, 2-ethanediyl-bis(oxy-2, 1-ethanediyloxy)]-bis(p-hydroxybiphenyl) terephthalate (PEOT), collectively called biphenyl-based liquid crystal polyesters (B-LCPE). The results show that B-LCPE possess the desired molecular structure, exhibit smectic phase in liquid crystal range and semicrystalline polymers at room temperature, and possess excellent intrinsic thermal conductivities, thermal stabilities, and mechanical properties. λ of PEOT is 0.51 W/(m·K), significantly exceeds that of polyethylene terephthalate (0.15 W/(m·K)) which has similar molecular structure with PEOT, and also higher than that of PEOS (0.32 W/(m·K)) and PEOP (0.38 W/(m·K)). The corresponding heat resistance index (THRI), elasticity modulus, and hardness of PEOT are 174.6℃, 3.6 GPa, and 154.5 MPa, respectively, and also higher than those of PEOS (162.2℃, 1.8 GPa, and 83.4 MPa) and PEOP (171.8℃, 2.3 GPa, and 149.6 MPa).

关键词： properties ethane polyester

Controlling Coherence Transfer of Dimer Interacting with Independent Environments

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Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： Fang Su zhong-xiao Man Department of Chemistry and Chemical Engineering Jining University Jining 273155 China Shandong Provincial Key Laboratory of Laser Polarization and Information Technology Department of Physics Qufu Normal University Qufu 273165 China

We study the coherence transfer between two pigments (donor and acceptor) of a dimer interacting with two independent environments. By means of a prior weak measurement on the donor and a post measurement, which is either a reversal measurement or a weak measurement, on the acceptor, we present a scheme to optimally control the transfer of the donor's coherence to the acceptor. We construct explicit relationships for the two measurement strengths and the evolution time, by which the coherence degree of the acceptor can approach the maximum value 0.5 at the cost of a decreased probability.

关键词： Dimer Coherence Quantum weak measurement Quantum reversal measurement

Characteristic and mercury adsorption of activated carbon produced by CO_2 of chicken waste

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Journal of Environmental Sciences 2008年第3期20卷 291-296页

作者： HUANG Yaji JIN Baosheng zhong Zhaoping zhong Wenqi xiao Rui Education Ministry Key Laboratory on Clean Coal Power Generation and Combustion Technology Southeast University Nanjing 210096 China

Preparation of activated carbon from chicken waste is a promising way to produce a useful adsorbent for Hg removal. A three-stage activation process （drying at 200℃, pyrolysis in N2 atmosphere, followed by CO2 activation） was used for the production of activated samples. The effects of carbonization temperature （409-4500℃）, activation temperature （700-900℃）, and activation time （1-2.5 h） on the physicochemical properties （weight-loss and BET surface） of the prepared carbon wereinvestigated. Adsorptive removal of mercury from real flue gas onto activated carbon has been studied. The activated carbon from chicken waste has the same mercury capacity as commercial activated carbon （Darco LH）（Hg^v： 38.7% vs. 53.5%, Hg^0： 50.5% vs. 68.8%）, although its surface area is around 10 times smaller, 89.5 m^2/g vs. 862 m^2/g. The low cost activated carbon can be produced from chicken waste, and the procedure is suitable.

关键词： activated carbon chicken waste mercury adsorption CO2

Model Selection in Estimation of Covariance Functions for Growth of Angora Goats

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Agricultural Sciences in China 2010年第7期9卷 1041-1049页

作者： LIU Wen-zhong ZHANG Yuan ZHOU zhong-xiao College of Animal Science and Technology Shanxi Agricultural University Taigu 030801 P.R.China College of Animal Science and Technology China Agricultural University Beijing 100193 P.R.China

Covariance functions have been proposed as an alternative to model longitudinal data in animal breeding because of their various merits in comparison to the classical analytical *** practical estimation,different models and polynomial orders fitted can influence the estimates of covariance functions and thus genetic *** objective of this study was to select model for estimation of covariance functions for body weights of Angora goats at 7 time *** functions were estimated by fitting 6 random regression models with birth year,birth month,sex,age of dam,birth type,and relative birth date as fixed *** effects involved were direct and maternal additive genetic,and animal and maternal permanent environmental effects with different orders of *** of model and orders of fit were carried out by likelihood ratio test and 4 types of information *** results showed that model with 6 orders of polynomial fit for direct additive genetic and animal permanent environmental effects and 4 and 5 orders for maternal genetic and permanent environmental effects,respectively,were preferable for estimation of covariance *** with and without maternal effects influenced the estimates of covariance functions *** permanent environmental effect does not explain the variation of all permanent environments,well suggesting different sources of permanent environmental effects also has large influence on covariance function estimates.

关键词： Angora goats growth covariance function model selection random regression model

Intrinsic high thermal conductive liquid crystal epoxy film simultaneously combining with excellent intrinsic self-healing performance

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Journal of Materials Science & Technology 2021年第9期68卷 209-215页

作者： Xutong Yang xiao zhong Junliang Zhang Junwei Gu Research&Development JnsMute of Northwestern Polytechnical University in Shenzhen Guangdong518057China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxi710072China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China

One kind of side chain liquid crystal epoxy(S-LCE) based on biphenyl mesomorphic unit is synthesized from 2,2-bis(hydroxymethyl)propionic acid,4-phenyl phenol,and *** the intrinsic thermal conductive liquid crystal epoxy film(LCEF) simultaneously combining with intrinsic self-healing performance is then prepared via thiol-epoxide nucleophilic ring-opening reaction and coating method.1 H NMR and FTIR show that S-LCE and LCEF have been successfully prepared.S-LCE presents nematic liquid crystal from room temperature to 160℃.LCEF maintains nematic liquid crystal performance and shows highly intrinsic thermal conductivity & excellent self-healing *** conductivity coefficient(λ)values in vertical direction(λ⊥)and parallel direction(λ‖)of LCEF are 0.33 and 1.25 W/mK,re spectively,much higher than that of general bisphenol A epoxy resin(E-51,λ⊥ of 0.19 W/mK and λ‖ of0.65 W/mK).Tensile strength of LCEF is 10.6 MPa,which can maintain at 90.6 % and 61.3 % after one and four cycles of self-healing behavior,*** addition,LCEF presents a wide service temperature range(-9.8-251℃) and good thermal stability(THRI of 148.5℃).Simultaneously,LCEF has good transparency,flexibility,and tailorability,expected to be utilized in the fields of flexible electronic devices and intelligent structures.

关键词： Liquid crystal epoxy Self-healing performance Intrinsic thermal conductivity Thermal stability

Controlled synthesis of silver nanoplates and nanoparticles by reducing silver nitrate with hydroxylamine hydrochloride

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Rare Metals 2017年第10期36卷 799-805页

作者： Zhi-Peng Cheng xiao-zhong Chu xiao-Qing Wu Ji-Ming Xu Hui zhong Jing-Zhou Yin Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Normal University Huaian 223300 China

An easy and effective method of silver nanoplate synthesis technique was created by reducing silver nitrate （AgNO3） with hydroxylamine hydrochloride （NH2OH·HCl） at room temperature. Silver nanoplates of various shapes, including triangular, truncated triangular, hexagonal, and truncated hexagonal, exhibit an average width and thickness of approximately 1 μm and 50 nm, respectively. Silver nanoparticles were acquired by placing polyvinyl pyrrolidone （PVP） in the reaction solution. The produced silver nanoparticles are quasi-spherical in shape and - 100 nm in size. The catalytic activity in the thermal decomposition of ammonium perchlorate （AID） was distinguished by thermogravimetric （TG） analysis and differential scanning calorimetry （DSC）. The outcomes reveal that the addition of silver nanoplates and nanoparticles diminishes the low decomposition temperature of AP by 7 and 14 ℃ and leads to a drop in the high decomposition temperature of AP by 60 and 110 ℃ and a rise in the total DSC heat release by 0.86 and 1.05 kJ.g^-1, respectively.

关键词： Silver nanoparticle Silver nanoplates Formation mechanism Ammonium perchlorate

Allowable variation of cold-rolled strip transverse profiles in high tension

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 608-616页

作者： xiao-chen Wang Quan Yang xiao-zhong Du Zheng-yi Jiang National Engineering Research Center of Flat Rolling Equipment University of Science and Technology Beijing Beijing 100083 China School of Mechanical Materials ＆ Mechatronic Engineering University of Wollongong Wollongong NSW 2522 Australia

The formation mechanism of the cold-rolled strip shape with high tension was studied. An advanced method to calculate the allowable variation of strip transverse profiles was established by the strip buckling criterion, which can be more properly used in cold rolling. With this method, the aim allowable variation of the product strip transverse profile and the required transverse profile range of incoming strips can be reached. Besides, this method has been successfully applied in a domestic tandem cold mill, and the transverse profile range of incoming strips suggested with this method is more practicable and complete. Consequently, the good performance is acquired.

关键词： cold rolling strips high tension buckling

Generalized braided Hopf algebras

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Applied Mathematics(A Journal of Chinese Universities) 2009年第1期24卷 105-113页

作者： LU zhong-jian FANG xiao-li Department of Mathematics Shaoxing College of Arts and Sciences Shaoxing 312000 China

The concept of （f, σ）-pair （B, H）is introduced, where B and H are Hopf algebras. A braided tensor category which is a tensor subcategory of the category ^HM of left H-comodules through an （f, σ）-pair is constructed. In particularly, a Yang-Baxter equation is got. A Hopf algebra is constructed as well in the Yetter-Drinfel＇d category H^HYD by twisting the multiplication of B.

关键词： (f, σ )-pair Yetter-Drinfel’d modules category braided Hopf algebra