Key Engineering Materials Vols. 480-481

Abstract: Hydrophilic Polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membranes were prepared by wet-spinning method. The effects of technical parameters of acrylic acid grafted onto PVDF on the performance of hydrophilic PVDF membranes were investigated via orthogonal test, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then hydrophilic PVDF membranes were characterized in terms of breaking strength, breaking elongation, rupture pressure, pure water flux and rejection. The fouling properties and the conditions of acrylic acid grafted onto PVDF were also examined. The results showed that acrylic acid had been grafted onto PVDF, the breaking strength and rupture pressure improved greatly, and the fouling properties were better than PS hollow fiber UF membrane.

Abstract: A troostite nodular cast iron was obtained by a heat treatment process of controlled cooling, reheating-up and isothermal treatment. Experimental results show that the troostite substrate demonstrates an interlamellar spacing below 100 nm. The supercooling condition in this specific heat treatment process is key to the formation of troostite. The mechanical properties are excellent, with tensile strength of 905.5~1029.5 MPa, hardness of 30.8~32.8 HRC, and elongation of 3.1~4.0 %.

Abstract: In order to evaluate its potential biomedicines, the extractives of Phyllostachys pubescens were extracted and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)-(% 7.02), stigmast-5-en-3-ol, oleate(4.33%), 4,4,6a,6b,8a,11,11,14b-octamethyl-1,4,4a,5,6,6a,6b,7,8, 8a,9,10,11,12,12a,14,14a,14b-octadecahydro-2h-picen-3-one(3.39%), etc. So the benzene-alcohol extractives of Phyllostachys pubescens could be used for biomedical engineering.

Abstract: During the low frequency electromagnetic casting process, the electromagnetic parameter plays an important role among the casting parameters. In this work, effects of electromagnetic parameters on the electromagnetic field and body force are analyzed by constructing a two-dimensional finite element model and using ANSYS software which is a kind of commercial FEM analysis software. The results show that the current frequency mainly influences the distribution of electromagnetic body force, the current intensity determines the intensity of electromagnetic body force, and the current frequency and intensity should be matched during the low frequency electromagnetic casting process.

Abstract: For some function optimization problems of non-linear, multi-model and multi-objective, they are difficult to solve by other optimization methods, however, genetic algorithm is easy to find good results, so a kind of optimization problem for mayonnaise compositions based on genetic algorithm is introduced. This termination condition is selected according to the iteration number of maximum generation, the optimal solution of last generation in the evolution is the final result with genetic algorithm to solve optimization problem. The population size is 20, crossover rate is 0.7, and mutation rate is 0.04. Via the evolution of 100 generations, the optimization solution is gotten, which has certain guiding significance for the production.

Abstract: Cinnamomum camphora is a famous non-wood tree, which can be used to extract camphor, C. camphora oil and its ramification. It is an excellent timber tree and evanescence species with the road. Researches about the chemical composition of C. camphora root wood is very less, this restricts the development and utilization of the root of C. camphora. Therefore, we used Py-GC/MS technology to analyze the high-grade resource recovering approaches of C. camphora root wood. After treated with freeze-drying and smashing, samples were extracted by the acetone extraction. After concentration and refrigeration dry, the comminuted power of C. camphora root wood was pyrolyzed in He atmosphere at 750°C, then the pyrolysis product was analyzed by online linked GC/MS. Relative content of each component was determined by area normalization. The analytical result showed that C. camphora root wood can be used as top value-added materials of biomedicine, and also as the materials of bioenergy, perfume, cosmetic, food, dye and industrial solvent.

Abstract: In order to find out its potential biomedicines, the extractives of Moso bamboo were adsorbed and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)-, methyl ester(5.68%), glycerin(4.32%), .gamma.-sitosterol(2.53%), benzofuran, 2,3-dihydro-(2.24%), decanoic acid, 1,2,3-propanetriyl ester(2.23%), phenol, 2,6-dimethoxy-(1.93%), stigmast-5-en-3-ol, oleate(1.92%), dodecanoic acid, 1-(hydroxymethyl) -1,2-ethanediyl ester(1.84%), 2-furancarboxaldehyde,5-(hydroxymethyl)- (1.72%), etc.

Abstract: In order to evaluate its potential health risk to biomedical engineering, the extractives of Phyllostachys pubescens were adsorbed and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-dimethyl-7 -(1-methylethyl)-(23.41%), benzofuran, 2,3-dihydro-(3.2%), cyclobutene(2.77%), 1-nonadecene (2.18%), isopropylcyclobutane(2.16%), stigmastan-3,5-diene(2.14%), benzene(2.03%), 1-hexadecene(1.99%), 1,3-butadiene, 2-methyl-(1.81%), glycerin(1.75%), 1-hexene(1.64%), phenol, 4-methyl-(1.55%), 2-methyl-1-butene(1.54%), toluene(1.47%), 1,3-cyclohexadiene(1.29%), heptacosane, 1-chloro-(1.17%), phenol, 4-(2-propenyl)- (1.06%), 1-pentadecene(0.96%), pentane, 3-methylene-(0.95%), etc. So the extractives of Phyllostachys pubescens was safe.

Abstract: The extractives of bamboo leaves were extracted and determined by Py-GC-MS. And the main constituents of extractives were tritriacontane(4.84%), 9-octadecyne(4.19%), ethyl alcohol(3.23%), 2-furanmethanamine, tetrahydro-(3.1%), .beta.-sitosterol acetate(2.84%), vitamin e(2.77%), triacontanoic acid, methyl ester(2.67%), .gamma.-sitosterol(2.33%), pyridine-3-carboxamide, oxime, n-(2-trifluoromethyl -phenyl)-(2.32%), nonacosane(2.15%), etc.

Abstract: In order to evaluate its potential health risk to food, Py-GC/MS was used to analyze the high-grade resource recovery of benzene/ethanol extractives of the Cinnamomum camphora wood. Relative content of each component was determined by area normalization. The main constituents were hexadecanoic acid, oleic Acid, octadecanoic acid, 4-chloro-2-fluoroaniline, cyclohexane, 1,1-dimethyl-, 7-heptadecene, 17-chloro-, brucine, ergosta-4,6,22-trien-3.beta.-ol, etc. So the benzene/ethanol extractives of Cinnamomum camphora could be used as materials of biomedicine.