Materials Literature
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This paper studies the effect of Zr addition to Pt-Sn/γ-Al2O3 catalyst on the activity,selectivity and deactivation in the propane dehydrogenation.The fresh catalysts were characterized by H2-TPR,H2-chemical adsorption and the amount of deposited carbon on used catalysts was analyzed by O2-pulse technology.The results…
Taken CaCl2 and K2B4O7 as raw materials, K2CaB8O26H24 was synthesized by water solution method . The value areas for mass ratio, reaction temperature, stirring speed, volume of water and reaction time were determined by single-factor index. Process conditions determined by orthogonal test are: water 450 mL;mol ratio o…
The oxidized bamboo fiber was first prepared by selective oxidation with NaIO4 and then treated by sericin protein solution.Sericin protein solution's impacts on oxidized bamboo fiber's weight gain rate and breaking strength were determined under different quality concentration,time,temperature and pH values.The resul…
The influence of carbon content(stochiometric content,exceeding 5%,10%,20%,50% and 100%) and carbon species(cock and carbon black) on the final products' phases were studied by XRD,SEM and EDS.The results show that Si3N4 powders can be synthesized by carbothermal reduction nitridation of natural quartz at 1 600℃.Howev…
The blue luminescence materials of xSrO·yAl2O3:Eu2+,Dy3++m%(molar fraction)(H3BO3)(m=15,20,23,25,30,35)were synthesized by the conventional solid state reaction method. The X-ray diffraction (XRD) showed that the phosphors are compounds of SrAl2O4, Sr2Al6O11 and Sr4Al14O25 with m=15～20, Sr2Al6O11 is the dominant host…
Using activated carbon as adsorbent,adsorb the naphthalene of naphthalen-rich diesel fuel was adsorbed and desorbed.Through the static and dynamic experiments,determine the balanced relationship of naphthalene of naphthalen-rich diesel fuel in the adsorbent was determined,and solution concentration and flow rate influ…
African Okan Flooring cants are used as test material and the transformed wood drier made in Germany is used to conduct a superheated steam heat treatment process test.The results show the practicability of the following process: the moisture content of the test piece to be treated should be controlled at 10%;the test…
Using potato cultivars E-potato NO.3 in western Hubei province as material,the potato starches were processed and the cold-water-soluble potato starches were manufactured by microwave treatment combined with ethanolsolution. The optimized technological conditions by orthogonal test L9(34) were as follows:ethanol solut…
The effect of laser sintering power on the phase structure and electrochemical properties of the LaMg_2Ni_9 alloys was investigated.It is found that all alloys consist of LaNi_5,LaMg_2Ni_9 and MgNi_2 phases.The amount of LaMg_2Ni_9 increases with the increase of sintering power.The discharge capacity is 101.1 and 85.3…
On a grinding abrasion testing machine,the wear process of 9SiCr treated under different heat treatment conditions was tested by using agricultural fiber material.Hardness and toughness of the steel treated by different processes were examined.Microstructure and morphology of the worn surface of the steel were studied…
A novel photocatalyst by loading of TiO2 onto the oxygen storage material Ce0.45Zr0.45Mn0.05La0.05OX was prepared by pore impregnating method using tetrabutyl titanate as material and tested for its catalytic performance with benzene as the simulated gas in a batch reactor.The results reveal that conversion of benzene…
Based on the gas-solid flow model,a model describing gas-solid flow and coke burning reaction in regenerator,which includes the model of carbon burning and hydrogen burning reaction kinetics,was established.In the model,the influence of interphase heat transfer and mass transfer was considered.The commercial FCC regen…
A new technique has been proposed to define and control the grain boundaries and domains of low temperature polycrystalline silicon (LTPS) films. It can be realized by combination of the solution process and the provision of nucleation sites (NS) and supplemental sites (SS). As a result, the crystallized poly-Si film…
The synthesis of retinyl palmitate in organic solvent with immobilized lipase Novozym 435 promoted by ultrasonic irradiation was investigated.The influence factors,such as:the solvent used,the molar ratio and concentrations of substrates,the reaction time,the amount of lipase and the ultrasonic irradiation power were…
The simulation method of the running-in phase of the HTR-10,the 10MW pebble-bed high-temperature gas-cooled reactor,has been demonstrated in this paper,based on the operation data of the HTR-10 and using VSOP,the HTGR physics analysis program.The major idea of the simulation includes the precise tracing on the power h…
Objective To evaluate the effect of heated silanization on the bond strength between ceramic and resin composite.Methods Two different silane coupling agents were applied onto the ceramic surface respectively,then heated at different temperature(20℃,40℃,60℃,80℃,100℃).Resin composite was bonded with ceramic.Then the sh…
Vacuum is promising to substitute SF6 in high voltage switchgears.This paper focuses on the feasibility of using vacuum as the primary insulation medium in a vacuum insulated switchgear(VIS).The vacuum system maintainability,insulation performance and heat dissipation were investigated based on the literature review,c…
Chitosan(CS) nanoparticles were prepared with the precipitation method by adding sodium sulfate;Cu2O/CS nano-composites were prepared by electrochemical deposition.Experiments showed that with the change of the reaction conditions,Cu2O nanoparticles could form needle-like or spherical formations on the surface of chit…
In the absence of solvent,phase transfer catalyst without conditions, with phosphotungstic acid as a catalyst,using MCM-41 zeolite as a catalyst carrier,30% hydrogen peroxide as the source of oxygen.under certain temperature can be cyclohexanol / cyclohexanone mixture into adipic acid oxidation.The 30% hydrogen peroxi…
The technical difficulties in the pressing technology and design of multi-position progressive die for the contact terminal of fuse cap have been analyzed in the text.The whole structure of the particular progressive die has been introduced.The key techniques such as design of working-position,layout,and key parts hav…