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International Conference on Surface Finishing technology and Surface Engineering

作者： Bi, W. B. Ge, P. Q. Song, S. Q. Gao, Y. F. Wang, Z. S. Zhang, L. Shandong Univ Sch Mech Engn Minist Educ Key Lab High Efficiency & Clean Mech Manufacture Jinan 250061 Peoples R China Xi An Jiao Tong Univ Sch Mech Engn Xian 710049 Peoples R China

ISBN: (纸本)9780878492336

The purpose of this paper is to modify the resin binder for developing resin-bonded diamond wire saw. The optimization of components with different ratios in the resin binder was investigated using orthogonal design experiments. Besides, the resin-bonded diamond wire saw was developed using the piano wire (the diameter is 0.2mm), the modified resin and the diamond abrasive (the diameter is 20 similar to 30 mu m). Good surface quality and slicing performance were obtained when slicing silicon crystal using the resin-bonded diamond wire saw we made in the experiments.

关键词： Resin modification Fixed-abrasive wire saw Orthogonal design experiments

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Dynamic interaction between the growing Ca-P minerals and bacterial cellulose nanofibers during early biomineralization process

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CELLULOSE 2010年第2期17卷 365-373页

作者： Gao, Chuan Xiong, Guang Yao Luo, Hong Lin Ren, Kai Jing Huang, Yuan Wan, Yi Zao Tianjin Univ Sch Mat Sci & Engn Tianjin 300072 Peoples R China Tianjin Univ Tianjin Key Lab Composite & Funct Mat Tianjin 300072 Peoples R China E China Jiaotong Univ Sch Mech & Elect Engn Nanchang 330013 Jiangxi Peoples R China Tianjin Hosp Dept Joint Surg Tianjin 300211 Peoples R China

Bone is a composite of organic phase (collagen nanofibers) and Ca-P minerals (hydroxylapatite) and an important biological structure in the field of biomineralization, but the interaction between organic matrixes and inorganic minerals is still too ambiguous. In order to investigate the interaction between the growing Ca-P minerals and organic nanofibers during early biomineralization process, bacterial cellulose (BC) nanofibers were used as templates to mimic collagen nanofibers for Ca-P minerals deposition via biomineralization for periods from as short as 4-72 h. Our findings pointed out that the resultant Ca-P minerals formed on BC nanofibers were platelet-like calcium-deficient HAp which was analogous to those in natural bone tissue. Strikingly, we found that the growth of Ca-P minerals had influence on the structure and properties of BC nano-templates during biomineralization process.

关键词： Biomineralization Bacterial cellulose Ca-P minerals Hydroxylapatite Interaction

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Pervaporation Recovery of Acetone-Butanol from Aqueous Solution and Fermentation Broth Using HTPB-Based Polyurethaneurea Membranes

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SEPARATION SCIENCE AND techNOLOGY 2010年第6期45卷 751-761页

作者： Tong, Cancan Bai, Yunxiang Wu, Jianping Zhang, Lin Yang, Lirong Qian, Jinwen Zhejiang Univ Inst Bioengn Coll Mat Sci & Chem Engn Dept Chem & Biochem Engn Hangzhou 310027 Zhejiang Peoples R China

In this paper, hydroxyterminated polybutadiene-based polyurethaneurea (HTPB-PU) pervaporation membranes were prepared by phase inversion and used for recovering acetone and n-butanol from dilute aqueous solutions. The effects of the operation temperature and feed composition on the pervaporation performance were investigated. The differences of the separation performance between the ternary mixture and binary mixture were also studied through evaluating the permeability coefficient, the swelling degree of the membrane, and the activity coefficient. The results indicated that a complex ocoupling effecto occurred in the ternary mixture. The pervaporation performance for the ternary mixture was superior to that for the binary mixture because of the permeant-permeant and permeant-membrane interactions. A high selectivity towards acetone and n-butanol was obtained. Acetone and butanol were condensed from 1.5 to 11.9wt% and 3.0 to 43.5wt% at 40 degrees C for the ternary mixtures, respectively. Furthermore, potential of the membrane for separation of organics from fermentation was also studied by testing the pervaporaton performance, and acetone and butanol were condensed from 0.5 to 8.7wt% and 1.1 to 16.4wt% at 45 degrees C, respectively.

关键词： acetone butanol fermentation pervaporation membrane polyurethaneurea

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Efficacy of DNA vaccines carrying Eimeria acervulina lactate dehydrogenase antigen gene against coccidiosis

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EXPERIMENTAL PARASITOLOGY 2010年第2期126卷 224-231页

作者： Song, Hongyan Yan, Ruofeng Xu, Lixin Song, Xiaokai Shah, Muhammad Ali A. Zhu, Huili Li, Xiangrui Nanjing Agr Univ Coll Vet Med Nanjing 210095 Jiangsu Peoples R China

The efficacies of DNA vaccines encoding either Eimeria acervulina lactate dehydrogenase (LDH) antigen or a combination of LDH antigen and chicken IL-2 or IFN-gamma were evaluated against chicken coccidiosis. Three vaccine plasmids pVAX-LDH, pVAX-LDH-IFN-gamma and pVAX-LDH-IL-2 were constructed using the eukaryotic expression vector pVAX1. Expressions of proteins encoded by plasmids DNA in vivo were detected by reverse transcription-polymerase chain reaction (RT-PCR) and western blot assay. Average body weight gain, oocyst output, survival rate and lesion scores were measured to evaluate the protective effects of vaccination on challenge infection. The results showed that DNA vaccines could obviously alleviate body weight loss, duodenal lesions, oocyst output and enhance oocyst decrease ratio. Anti-coccidial indexes (ACIs) of pVAX-LDH-IFN-gamma and pVAX-LDH-IL-2 groups were higher than that of other groups. Flow cytometric analysis of T lymphocytes in spleen and cecal tonsil demonstrated that DNA vaccines had significantly increased percentages of CD3(+) T cells compared with pVAX1 alone or TE buffer. The results provided the first proof that DNA vaccine carrying E. acervulina LDH antigen gene induced protective immunity against homologous infection and its effect could be enhanced by co-expression of chicken IL-2 or IFN-gamma. (C) 2010 Elsevier Inc. All rights reserved.

关键词： Eimeria acervulina Lactate dehydrogenase DNA vaccine

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Autothermal reforming of methane over Rh/Ce_0.5Zr_0.5O₂ catalyst: Effects of the crystal structure of the supports

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FUEL PROCESSING techNOLOGY 2010年第3期91卷 306-312页

作者： Cao, Lei Pan, Liwei Ni, Changjun Yuan, Zhongshan Wang, Shudong Chinese Acad Sci Dalian Inst Chem Phys Dalian 116023 Peoples R China Chinese Acad Sci Grad Sch Beijing 100049 Peoples R China

Autothermal reforming of methane (ATR) was studied over Rh catalysts supported on Ce0.5Zr0.5O2 solid solution, which were synthesized by four different routes, including reverse micro-emulsion (ME), co-precipitation (CP), urea-combustion (UC) and sol-gel (SG) method. The textural and structural properties of the as-prepared solid solutions were carefully examined by means of BET. TEM, XRD and Raman techniques. Results showed that the ME sample exhibited a single cubic phase, whereas tetragonal or mixed phases such as cubic CeO2-rich and tetragonal ZrO2-rich phases, were found in the case of CP, UC and SG. Vegard's rule revealed that the homogeneity of these as-prepared solid solutions followed the order of ME>CP>UC>SG. TPR and CO-pulse experiments were adopted to evaluate the reducibility and the oxygen storage capacity (OSC) of the catalysts. It was found that the more homogenous the solid solution is, the more reducibility it is, i.e. both the reducibility and OSC followed the same order as that of homogeneity. Rh/ME showed the highest activity and H-2/CO ratio and such performance was maintained without significant loss during 10 h experiment. On the contrary. the other three catalysts having mixed phases showed remarkably deactivation in terms of H-2/CO due to the loss of BET area. To elucidate the resistance toward carbon formation of these catalysts, methane decomposition experiments and following temperature-programmed-oxidation (TPO) were studied. As expected, the resistance toward carbon formation could be enhanced by the improved OSC of the catalyst. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Methane ATR Rh/Ce0.5Zr0.5O2 Raman

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Oligochitosan: A plant diseases vaccine-A review

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CARBOHYDRATE POLYMERS 2010年第1期82卷 1-8页

作者： Yin, Heng Zhao, Xiaoming Du, Yuguang Chinese Acad Sci Dalian Inst Chem Phys Liaoning Prov Key Lab Carbohydrates Nat Prod & Glycoconjugate Res Grp Dalian 116023 Peoples R China

Chitosan is one of the most abundant carbohydrate biopolymers in the world. Oligochitosan prepared from chitosan is a potent plant immunity regulator. The efficacy of oligochitosan on plant disease control is presented in this review. This paper summarizes recent progress made on oligochitosan activated plant innate immunity, including: signal perception;signal transduction: oligochitosan response genes and proteins;oligochitosan induced defense-related secondary metabolites accumulation. Based on published papers and our former results, we deduce that the mode of oligochitosan act on plant is similar with general vaccines act on human and animals. So we conclude that oligochitosan is a plant disease vaccine. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Oligochitosan Plant diseases Plant immunity Plant protection Vaccine

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Analysis of Biodegradability of Three Biodegradable Mulching Films

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JOURNAL OF POLYMERS AND THE ENVIRONMENT 2010年第2期18卷 148-154页

作者： Liu, Min Huang, Zhan-bin Yang, Yu-Jiao China Univ Min & Technol Beijing Coll Chem & Environm Engn Beijing 100083 Peoples R China

The development of biodegradable mulching films is a great direction for environment protecting and oil saving problems. In this paper, it was used three kinds of biodegradable mulching films named a, b and c (different ratio between modified starch and poly-CL with pro-oxidant additives) in microorganism culture test and soil burial test was investigated under laboratory conditions. The index of degradation was assessed by visual observation, weight loss and SEM analysis from quantitative and qualitative aspect. The results of both tests showed that these biodegradable mulching films were more readily degraded than the common plastic film. The percentage weight loss was in sequence of biodegradable mulching film c > biodegradable mulching film b > biodegradable mulching film a, while common plastic film basically had no changes. Weight loss was not as obvious as the visual degradation and suggested broader types of microbial attack. SEM analysis clearly indicated that the changes of surface morphology of these samples after the soil burial exposure. Keywords Mulching film - Biodegradability - Micro-organism culture test - Soil burial test

关键词： Mulching film Biodegradability Micro-organism culture test Soil burial test

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Changes of cytokines and IgG antibody in chickens vaccinated with DNA vaccines encoding Eimeria acervulina lactate dehydrogenase

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VETERINARY PARASITOLOGY 2010年第3-4期173卷 219-227页

作者： Song, Hongyan Song, Xiaokai Xu, Lixin Yan, Ruofeng Shah, Muhammad Ali A. Li, Xiangrui Nanjing Agr Univ Coll Vet Med Nanjing 210095 Jiangsu Peoples R China

The aim of this study was to investigate the changes of cytokines and specific serum IgG in chickens following vaccination with DNA vaccines encoding either Eimeria acervulina (E. acervulina) lactate dehydrogenase (LDH) antigen or LDH and chicken IL-2 or IFN-gamma. Two-week-old chickens were randomly divided into five groups. Experimental group of chickens were immunized with DNA vaccines while control group of chickens were injected with pVAX1 plasmid alone or sterile water. All immunizations were boosted 2 weeks later. The LDH-specific IgG antibody response was measured at weeks 1-6 post-second immunization. The result showed that the antibody titers in chickens vaccinated with DNA vaccines were significantly different from those of the control groups 1 week after the second immunization (P < 0.05) and reached the maximum values 3 weeks post-second immunization. The systemic and local cytokine mRNA expression was determined by quantitative RTPCR 7 days post-second immunization. The specific IgG antibody levels against LDH of all chickens vaccinated with vaccines were increased compared to those of sterile water (H2O) and plasmid (pVAX1) control chickens 1-6 weeks post-second immunization (P < 0.05). The mRNA levels of IFN-gamma, IL-2, TNFSF15, IL-17D as well as TGF-beta 4 in both spleen and cecal tonsil were also increased in experimental chickens. In contrast, the only significant change of IL-4 mRNA level was observed in spleen of chickens immunized with pVAX-LDH-IL-2 compared with pVAX-LDH and control groups (P < 0.05). These results suggested that DNA vaccines could increase the IgG antibody level and induce the expressions of cytokines. (C) 2010 Elsevier B.V. All rights reserved.

关键词： E. acervulina LDH DNA vaccine Cytokine IgG

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Effects of Current Time-Delayed Feedback on the Dynamics of a Permanent-Magnet Synchronous Motor

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2010年第6期57卷 456-460页

作者： Wei, Du Qu Zhang, Bo Qiu, Dong Yuan Luo, Xiao Shu S China Univ Technol Coll Elect Power Guangzhou 510640 Guangdong Peoples R China Guangxi Normal Univ Coll Elect Engn Guilin 541004 Peoples R China

We investigate how the dynamics of a permanent-magnet synchronous motor (PMSM) depends on current time-delayed feedback, in which the delay time is both fixed and varying in time. We choose model parameters for which the PMSM displays, in the absence of feedback, chaotic oscillations. The stable operation islands of the PMSM are first investigated in the parameter space of feedback gain and delay time. Then, detailed regimes of motion can be explored by bifurcation diagrams. It is found that the dynamic delay time feedback can obtain stabilization of unstable steady states over a much larger domain of parameters in comparison with the static delay time feedback. The mechanism behind the action of current time-delayed feedback is also addressed. This brief may provide a useful tip for maintaining the security operation of electromechanical systems.

关键词： Bifurcation chaos current time-delayed feedback permanent-magnet synchronous motor (PMSM)

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Experimental and numerical simulation studies of the fluidization characteristics of a separating gas-solid fluidized bed

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FUEL PROCESSING techNOLOGY 2010年第12期91卷 1819-1825页

作者： Zhao, Yuemin Tang, Ligang Luo, Zhenfu Liang, Chuncheng Xing, Hongbo Wu, Wanchang Duan, Chenlong China Univ Min & Technol Sch Chem Engn & Technol Xuzhou 221116 Jiangsu Peoples R China

Gas-solid fluidized bed separation expands the choices of highly efficient dry coal beneficiation methods The hydrodynamics of 0 3-0 15 mm large Geldart B magnetite powder were studied using a combination of experimental and numerical methods to optimize the design of the solid medium used in the fluidized bed The results show that the Syamlal-O Brien drag model is suitable for simulating the bed and it is verified that simulated and experimental results are consistent with each other If the static bed height is no more than 300 mm then the bed height has minimal effect on the fluidization characteristics As the superficial gas velocity increases the bed activity is improved However at the same time the uniformity and stability of the bed drop Therefore the gas velocity should be adjusted to no more than 2 OU(mf) The density of the Geldart B bed is uniform and stable which indicates a relatively high fluidization quality Furthermore compounded medium solids consisting of <0 3 mm magnetite powder with a 03-0 15 mm particle content of 65 25% and <1 mm fine coal were used in a pilot gas-solid fluidized bed of 5-10 ton/h capacity The pilot bed was used to separate 50-6 mm coal This test resulted in the coal ash content being reduced from 23 74% to 11 79% with a probable error E of 007 g/cm(3) and a recovery efficiency of 98 26% This indicates that the bed has good separating performance Nevertheless to increase the applicability of the separating bed a further study emphasizing a decrease in the lower size limit of the magnetite powder should be performed (C) 2010 Elsevier B V All rights reserved

关键词： Separating gas-solid fluidized bed Medium solids Fluidization characteristic Numerical simulation Dry beneficiation of coal

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