Materials Literature
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The sulfur modified nanostructured vanatia-titania catalysts were prepared by the rapid combustion method and ap-plied to the one-step oxidation of methanol to dimethoxymethane(DMM).The results showed that the addition of sulfur efficiently in-hibited the formation of by-product methyl formate and greatly increased DM…
The cause of a flashover,broken string of ±500 kV Jiangcheng D.C.transmission line ceramic insulators during the ice damage in early 2008 is investigated and analyzed,focusing on the test about electrical and mechanical properties.Based on operating experience and test results,it is preliminary analyzed that the actua…
Two kinds of activated carbon were obtained from phenolic resin and coal tar pitch carbon foams by vapor activation,with specific surface area of 961 and 953m2/g respectively.Their morphology and pore structure were characterized with scanning microscope and BET nitrogen adsorption instrument,while the charge discharg…
In the paper,damage of the coolant channel ligaments(CCLs) of thrust chamber for reusable liquid-propellant rocket engines was studied.The sandwich beam models,Freed Visco-plastic models and thinning models of the CCLs were founded first.Then the CCLs's damage for the reusable liquild-propellant rocket engine's primar…
The optimum extracting technology of isoflavonoids from pueraria lobata(Wiolld.)Ohwi was investigated by using the factorial and orthogonal design,and macroreticular resin was used for the purification of pureraria isoflavonoids.The results showed that 70 ℃,8∶1(v /w)of 50% ethanol and 2.5 hours were the optimum onditi…
The self-assembly of phenylalanine into peptides assisted by phosphorus trichloride(PCl3),phosphorus oxychloride(POCl3) and central triphosphate(P3M)was studied in detail,respectively.The structures of the products from each of the reaction systems were analyzed and identified by LC-MS and ESI MS,respectively.The effe…
Based on summarizing the development of coating technology at home and abroad,this paper introduces in detail spraying modes and spraying materials,and from the actual application,looks forward to the development trend and perspective of spraying technology.
Objective To clone the functional gene of mouse ornithine decarboxylase antizyme-1(OAZ1), express in prokaryotic cells and purify the recombinant OAZ1 protein. Methods OAZ1 gene was amplified from the total RNA of mouse melanoma B16-F1 cells by RT-PCR, and a functional gene of which the full-length could be translated…
Fe3+-doped ZnO nanoparticles were prepared by the sol-gel method.XRD,FT-IR,UV-Vis and FS techniques were used to characterize the Fe3+-doped ZnO.The photocatalytic activity was tested with methyl orange as the objective decomposition substance.The results showed that the average diameter of Fe3+-doped ZnO nanoparticle…
Halogen-free retardant polypropylene(PP) was prepared by using melamine polyphosphate(MPP) and 1-oxo-4-hydroxymethy1-2,6,7-trioxa-1-phospha-bicyclooctane(PEPA).The effects of nickel carbonate(NC) contents on flame retardancy and mechanical properties were studied.It was found that a little amount of NC could improve t…
Trace Ti doped nano-zirconia was prepared via the one-pot reaction, and its phase transition and luminescence properties were characterized. It is believed that generation of excess oxygen vacancies within the trace Ti doped ZrO 2 nanocrystalline is primarily responsible for the room temperature tetragonal phase stabi…
Adsorption properties of o-chlorophenol onto bamboo charcoal carbonized at 500℃,700℃ and 900℃ were investigated.The effect of various parameters such as pH value,adsorption time,adsorbent dosage,initial concentration of o-chlorophenol and adsorption temperature was studied.The results indicated that the bamboo charcoa…
β-(3,4-Epoxycyclohexyl)ethyl trimethoxysilane were synthesized by the platinum complexes catalyzed hydrosilation reaction of trimethoxysilane and 1,2-epoxy-4-vinylcyclohexane.The products were analyzed by means of GC-MS,and the effects of reaction temperature,the kind of catalyst,and the amount of catalyst on the prod…
The dodecyl glycerol ether carboxylate anionic surfactant was synthesized by two steps.Intermediate product,dodecyl glycerol ether was first synthesized and then reacted with sodium chloroacetate to obtain the product.The influencing factors,such as reaction temperature,time,molar ratio,the amount of sodium hydroxide…
Based on the principle of saving energy and reducing production cost,technical measures as improving its process flow,well controlling processing equipments,increasing sliver can height,enhancing the back stop motion reliability of draw frame and using frequence convert to stabilize the yarn tension of roving machine…
A series catalyst of Cu/ZSM-5,which were loaded with differernt content of Cu,were prepared by method of ion exchanging.Active of catalysts which was about decomposition of NO,was observed.The results indicated that the catalysts have good activity,which were based on ZSM-5(Si/Al 25H).And the samples were made by the…
Through the pilot production, this paper explores the processing parameters of wheelset products that meet EN13260 standard including the determination of mechanical processing parameters of axle and wheel, the requirements for the size, geometric tolerance and roughness of the finished products, and the reasonable ra…
Graphene oxide sheets(GOs) are prepared in large amount by traditional chemical dispersion me-thod,and then GOs/water soluble PF resin(WPF) nanocomposites are prepared by directly blending method.AFM,SEM,FT-IR,TG are employed to characterize these composite membranes.The results suggest that GOs is exfoliated totally…
Preparation of cross-linked polyvinyl chloride(PVC)foamed plate via boiling foaming method,the research of sample′s cross-linked structure was used by infrared spectrograph.The results showed that maleic anhydride and styrene were grafted with the PVC′s main chain,which reacted with methylene diphenylamine to form cro…
Natto have many sanitarian functions,but the taste was specially.In order to develop a new type of Natto food,the sesame catsup and the sweetened soybean paste and some other additives were used in the compound flavoring paste of Natto.The results showed that the best formulation of the product was as follows: sweeten…