Materials Literature
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Objective: To find out the most suitable investments and diameter of sprue and length of sprue for Ti-24Nb-4Zr-7.9Sn alloy,improve the castability of Ti-24Nb-4Zr-7.9Sn alloy.Methods: Net patterns were applied in this study.Ti-24Nb-4Zr-7.9Sn alloy were casted respectively in three investments by three diameter of sprue…
A new hyperbranched polyester(HBPE) with aromatic-aliphatic skeleton was prepared by melt polymerization of isophthalic acid(IPA,A2 type monomer) and trimethylolpropane(TMP,B3 type monomer) with p-toluenesulfonic acid as catalyst.Then the HBPE with partial hydroxyl and acrylic end groups was prepared by the reaction o…
The effects of current waveform and current density on the deposition rate,appearance,microhardness and surface morphology of Fe coating electroplated from a stable bath containing FeCl2 400 g/L,ascorbic acid 3.2 g/L,glycine 2 g/L and fluoroboric acid 6.4 mL/L on steel substrate were studied. Single pulse current is t…
Taking synthetic graphite as the carbon source,boron as the additive,and NiMnCo alloy as the metal solvent,the morphology changes of metastable regrown graphite crystals are studied by temperature gradient method under high pressure and high temperature(HPHT) -diamond-stale pressure and temperature(5.4 GPa,1550 K) . I…
Up to now,the welding joints of P92 steel pipes have been all repaired in China by the matching welding materials.A test study was carried out on repairing the welding joints of P92 steel pipes by nickel welding materials,in case of the matching welding materials are not available on the site.The welding was done by u…
Objective:To prepare superparamagnetic Fe3O4 chitosan nanoparticle and detect its physicalmagnetic properties.Methods:Superparamagnetic Fe3O4 chitosan nanoparticles were prepared through chemical coprecipitation.The sample was analysed with configuration and magnetism by transmisson electron microscopy and atomic forc…
Surface enhanced fluorescence effects were studied with laser spectroscopic technique for acridine orange (AO) fluorophore that has potential applications in bioscience and clinic purpose. Mechanically polished metallic surfaces including Ag,Al and Cu were employed as enhancement surfaces. The experimental observation…
A Schiff base ligand derived from bis-pyridine-2-carboxaldehyde with p-phenylenediamine and its six new rare earth complexes were synthesized in ethanol.The complexes were characterized by elemental analysis,molar conductance, IR,thermogravimetric and magnetic measurements.The complex type is 2∶2 type(RE: L) and the e…
The PET/PbS nanocomposites were prepared by twin-screw extruder, and the thermal degradation kinetics behaviors of PET and PET/PbS in air atmosphere by means of TG were studied. It was found that there was not much difference in the thermal degradation between PET and PET/PbS. The activation energy was determined usin…
Aim To establish a method of determination of phenolphthaleinum in phenolphthalein suppository by HPLC.Methods For chromatographic column ODS-C 18 was used as the filling agent.The flowing phase was methyl alcohol-water(60∶40),and the examination wave length was 275 nm.Results The linear relationship was Y=15.8649X+3.…
SnO_2 nanoparticles with an average diameter less than 10 nanometers have been synthesized by chemical precipitation method.CNT-encapsulated Sn nanowires were prepared by a chemical vapor deposition(CVD) method over as-synthesized SnO_2 nanoparticles.CNT-encapsulated Sn nanowires were characterized by X-ray diffractom…
The flame retardancy of the high resilience polyurethane foam was studied using flame retarding polyurea polyol with nitrogen-containing structure and flame retardant. The influence of the polyurea polyol quantity and the flame retardant variety in the formulation on the smoke density and oxygen index of the foam was…
Objective To investigate the expression of HIWI in humam gliomas of different grades.Methods HIWI expression in glioma cells was detected by immunohistochemical(IHC) staining,semi-quantitative reverse transcriptase-PCR and Western blot in four grades of Ⅰ,Ⅱ,Ⅲ and Ⅳ with 10 cases each,which was compared to 12 specimens…
The wear test,rotation friction test and torsion test were conducted to evaluate the torsion strength and wear resistance of quenched and tempered 45 steel crankshafts treated by different surface treatment,such as induction hardening,liquid nitrocarburizing and gas nitrocarburizing.The test results were compared and…
The styrene-acrylic emulsion was modified by a new bis-alkoxyl silane coupling agent and a conventional trialkoxyl silane coupling agent.The corrosion protection property of the coating before and after modification was studied by electrochemical impedance spectroscopy(EIS).The results showed that the corrosion protec…
In this work transparent and conductive La0.07Sr0.93SnO3(LSSO) films were employed as electrodes for fabrication of the epitaxial and transparent BiFe0.95Mn0.05O3(BFMO) ferroelectric capacitors,which were grown on SrTiO3(STO) substrates by the pulsed laser deposition method.The BFMO/LSSO/STO heterostructures show exce…
Hydrilla verticillata,the experimental material in this study,was kept in freshwater culture medium for two days,and in five seawater culture media(0,3,6,9,12) for one day respectively.The salt fluctuation was repeated four times,and corresponding treatments were marked with S0,S1,S2,S3 and S4 respectively.The growth…
Electroless copper plating bath working at room temperature has the advantages of lower working temperature, lower decomposition rate of formaldehyde and lower cost for maintenance. In order to obtain good copper layer, different additives must be added to the copper plating bath. A perpendicular experiment with seven…
The amphoteric polyacrylamide for the thickener of fracturing fluid is prepared using inverse phase suspension polymerization and redox initiation system.The chemical structure of the product is characterized with FT-IR.It is shown that the relative molecular mass of the product reaches to 5.28×106 under the optimum c…
Amorphous magnetic powder cores were fabricated from the amorphous Fe-Cr-Si-B alloy powder prepared by water atomization. The effects of annealing temperature and forming pressure on the performance of the core were investigated. The results show that the prepared Fe-Cr-Si-B alloy powder is highly amorphous and shows…