Advanced Materials Research Vols. 129-131

Abstract: Cunninghamia lanceolata has been the dominated species of plantation forest in South China. And thermoplasticization can decreases the hydroscopicity to increase the additional value of Cunninghamia lanceolata biomass. However, many heat release volatiles would produce air pollution during thermoplasticization process. Therefore, the heat release behavior of Cunninghamia lanceolata biomass was studied by TD-GC/MS to make full use of and prevent the pollution of the volatile materials. The main constituents were cedrol(34.34%), phenol, 2,4-bis(1,1-dimethylethyl)( 11.49%), acetic acid(6.83%), carbon disulfide(3.1%), etc at 150°С. And the main constituents were acetic acid(20.22%), cedrol(17.20%), 1h-3a,7-methanoazulene, 2,3,4,7,8, 8a-hexahydro-3,6,8,8-tetramethyl-(3.58%), benzofuran, 2,3-dihydro-(3.26%), etc at 180°С. The heat release volatiles of Cunninghamia lanceolata biomass might be used as raw materials of bioenergy, rare biomedicines, and so on. Particularly, the volatiles had good application prospects and popularized value in purification of cedrol and acetic acid.

Abstract: The landscape industry has become one of the industries with higher resource and energy consumption, and the implementation of urban low-carbon landscape construction is of great significance to improve the ecological environment. In this study, the method of low-carbon landscape construction was studied from two aspects including the carbon source control and carbon sink, as well as both direct and indirect effect. The results showed that the low-carbon landscape construction can be controlled from five aspects including landscape planning, landscape design, low-carbon landscape technology, low-carbon landscape behavior and low-carbon policy. Through a series of low-carbon measures, carbon emissions can be controlled at a reasonable level during the urban landscape construction, which also promotes the sustainable development of urban ecological environment.

Abstract: The objective of this study was to determine the chemical and physical changes of chemical modified on poplar wood. The chemical modifier was impregnated into cell lumen space by pulse-dipping machine to improve the dimension stability and mechanical property of timber. The timbers were compressed and dried by the multilayer hot-press drying to produce the modified timber. The modified timber had better dimension stability than the natural wood when they were immerged water continuous eight-hour. Characteristics of Fourier Transform Infrared Spectroscopy (FTIR) for modified were studied by the FTIR spectrometer. The intensity of hydroxyl absorption peak in the infrared absorption spectrogram decreased significantly, and that of carbonyl decreased lightly, which due to the bond of the function groups of -NHCH2OH of urea-formaldehyde prepolymer react with the wood carboxyl (C=O) and hydroxyl(-OH). The morphologic models of chemical within wood were discovered by SEM.

Abstract: An ontology-based workflow (workflow-ontology) representation method was proposed after analyzing that not only structure information but also semantic information were needed in a workflow model. Workflow-ontology concepts were composed by class and subclass of the workflow. Concepts’ properties including their values and characteristics were redefined, and then, workflow-ontology modeling method was put forward based on the ontology expresses and definitions above. With the example of applying in products examined and approved workflows, the corresponding workflow-ontology model (WFO) was built.

Abstract: Phyllostachys heterocycla, who was considered to have biohealth function in folk, is becoming a major biomass in rooms. Therefore, the chemical components from Phyllostachys heterocycla were identified by TD-GC/MS at different temperature. The main function components of Phyllostachys heterocycla biomass at 40°С were 1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(21.32%), [1,1':3',1''-terphenyl]-2'-ol(9.16%), (2,3-diphenylcyclopropyl)methyl ph enyl sulfoxide, trans-(6.54%), cedrol(6.11%), bicyclo[2.2.1]heptan-2-one, 1,7,7- trimethyl-, (1r)- (6.04%), 1,6-cyclodecadiene, 1-methyl-5-met hylene-8-(1-methylethyl)- (4.82%), 1-heptadecanamine(4.79%), propanedioic acid, methyl-, diethy l ester(4.36%), squalene(4.25%), etc. And the main function components at 60°С were1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(14.02%), camphor(10.57%), [1,1':3',1''-terphenyl]-2'-ol(6.91%), pentanoic acid, 2-benzenmethanimin yl-5-guanidinyl-(5.68%), 1,6-cyclodecadiene, 1-methyl-5-methyl- (5.27%), cedrol(4.83%), 2-bromo-2,2-dichloroethylcarbamic acid, ethyl ester(4.56%), n-n-butylpropionamide(4.49%), bicyclo[3.1.1]heptane, 6,6-dimethy l-2-methylene-, (1s)- (4.12%), etc. Phyllostachys heterocycla biomass was more healthy to human at 40°С than 60°С. So Phyllostachys heterocycla biomass was fit to use after drying.

Abstract: Poplar composite biomaterial, which self bonded under high temperature and pressure, is a new indoors materials. In order to evaluate its potential health risk to human settlements, the volatile organic compounds of poplar composite biomaterial were adsorbed and determined by TD-GC-MS. The result were: (1) The main constituents of volatiles at 40°С were acetic acid(50.6%), 1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(8.48%), [1,1':3',1''-terphenyl]-2'-ol(3.98%), 1,2-propanediol, 3-benzyloxy-1,2-d iacetyl-(3.12%), etc. (2) The main constituents of volatiles at 60°С were acetic acid(46.7%), 1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(7.93%), cedrol(5.53%), butane, 1-(benzyloxy)-2-[(benzylox y)methyl]- (5.43%), [1,1':3',1''-terphenyl]- 2'-ol(3.72%), 1-propene, 3-(2-cyclopentenyl)-2-m ethyl-1,1- diphenyl-(3.18%), etc. Generally, the poplar composite biomaterial was safe under 40-60°С.

Abstract: Three groups of commercial 1060 Al alloy sheets were subjected to constrained groove pressing (CGP) at room temperature using parallel CGP, 180° cross CGP and 90° cross CGP, respectively. Tensile properties and fracture modes of as-annealed and CGPed samples were investigated. The ultimate tensile strength (UTS) of 1060 Al increases significantly after CGP, while the elongation decreases. But they are strongly dependence on the number of CGP passes and the pressing modes. The UTS and elongation of the samples processed by 90° cross CGP are best, consequently, the static toughness of the 90° cross CGPed samples is enhanced. Besides, all CGPed specimens failed in a ductile manner. With increasing the number of CGP pass, the amount of small dimples increases, and the dimples become shallow and more uniform.

Abstract: In this paper, we introduce an mathematical theory model of ultrasonic breaking up dendrite through the experiment of put ultrasonic vibration on melting A356, which is based on the condition of the effect factors of particles compelled movement on crystal integrality. It can be seen that two factors are very importment to crushing the grain through ultrasonic vibration, namely, structure conditions of the grain growth and the dynamic conditions provided by the ultrasonic. The driving force provide by the ultrasonic can be direct alternating mechanical force and the second, third and so on sound wave force caused by ultrasound wave reflection, scattering etc.. Form the model we can found that the larger the ultrasonic power and amplitude, conditions can be more easily satisfied; simlarly the higher the ultrasonic frequency, angle crossing number, grain structure defects, the longer action time to make greater fatigue, all this factors can also make the conditions more easily satisfied.

Abstract: With the development and application of the Internet and Intranet, it shows that the response of the traditional manufacturing model to the information lags behind the change. Based on the computer technology, web technology and modern communication technology, the information flow of networked manufacturing system can be transferred timely among virtual alliance regardless of regions. So social manufacturing resource can be used fully. In order to share timely the information and optimize the social manufacturing resource about designing and producing car wheel hub, a solution to establishing networked manufacturing system of car wheel hub based on ASP and SQL Server was put forward. According to detailed analysis the process of design information transferring and the hub designing, a prototype networked manufacturing system of car wheel hub had been developed. It has very great practical value.

Abstract: Shock response analysis of a journal-bearing system with the journal-bearing connection modeled as a spring link in radial direction and a dry contact joint respectively is presented. In the first model, the spring constants representing oil-film characteristic are determined by eight coefficients. In the second model, the friction forces are calculated using a modified Coulombs friction law. The contact detection points are the integration point and located at Gauss points. Only the contact normal pressure is treated as a Lagrange multiplier. The tangential contact stresses are calculated based on the penalty method. System’s time varying responses are obtained by FEM. A results comparison was performed between “spring link” model and “dry contact” model. The main conclusion is that stress distribution is nearly same in the system modeled by the two methods, but the amplitude in the former is smaller than that in the latter.