Advanced Materials Research Vols. 989-994

Abstract: A series of metal-DPDME (metal deuteroporphyrin dimethyl ester) complex were synthesized through dehydrogenation, deferrization, esterification, metal-complexation using hemin as raw materials. Found red shift at Soret band and blue shift at Q band in UV-Vis spectrum which is different from tetraphenylporphyrin, and different excitation and emission peaks in fluorescence spectrum between DPDME and Co (II)-DPDME.

Abstract: This research is divided into 2 parts. In part I, the optimal ratio of polymer blends between chitosan (CS) with carboxymethyl cellulose (CMC) by using glutaraldehyde (GL) as crosslinked agent. In part II, the effect of starch on the properties of polymer blends was determined. The chemical interaction of the blends was studied with Fourier Transform Infrared Spectroscope (FT-IR). The thermal properties of polymer blends were also determined with differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA). Moreover, the study of physical property was performed with a Swelling Test method. From test results in part I, the optimal ratio between CS (0.8%w/v) and CMC (0.8%w/v) was 3:2 by volume. Furthermore, the FT-IR spectra reveals the chemical interaction (C=N). In part II, the blend which was added with 50 percent by weight of starch show the highest glass transition temperature. The maximum rate of decomposition temperature and the percentage of swelling were increased with the increase of starch.

Abstract: Distinct from conventional truss, FAST project reflector elements require light weight, high accuracy backup structure. A new type of aluminum alloy frame backup element is designed and simulated. According to which, an aluminum alloy backup element prototype is manufactured and assembled at the under-construction site. And with a serial of measure experiments, the prototype data meets the requirements. Thus the design and experiments verify the efficiency of the structure.

Abstract: The objective of this work was to examine the influence of carbonation on the water vapor adsorption desorption isotherms of cement materials. Two types of Portland mortars, which were CEM I and CEM II, were carbonated at 20°C, 65% relative humidity and 20% of CO₂ concentration. The pore size distributions were determined from the water adsorption method. We also studied the coupling effect between carbonation and humidification-drying cycles. The results showed a reduction in microporosity and a small increase in the mesoporosity. The pores clogging due to formation of calcium carbonate was highlighted by the reduction of the quantity of adsorbed water and the decrease in the hysteresis isotherms. The results of this study also indicated that the humidification-drying cycles coincide only from the second cycle because of a difficult evacuation of water during desorption, even at low humidity.

Abstract: By means of raw performance analysis of silt sintered porous brick, the importance of synchronous cutting machine in the molding process was revealed. On basis of the analysis of the present situation of research and application of synchronous cutting machine at home and abroad, according to the forming characteristics of silt sintered porous brick, technical parameters of synchronous cutting machine was explained and the development trend of the synchronous cutting machine was expected.

Abstract: The crack tip field in functionally graded piezoelectric materials (FGPMs) under mechanical and electrical loadings is studied. Different from previous analyses, all material properties of the functionally graded piezoelectric materials are assumed to be linear function of y perpendicular to the crack. The crack surfaces are supposed to be insulated electrically. Similar to the Williams’ solution of homogeneous elastic materials, the higher order crack tip fields of FGPMs are obtained by the eigen-expansion method.

Abstract: The problem of an anti-plane crack situated in the interface of functionally graded piezoelectric materials (FGPMs) and homogeneous piezoelectric materials (HPMs) is considered under the impermeable assumption of crack surfaces. The mechanical and electrical properties of the FGPMs are assumed to be exponential functions of y perpendicular to the crack. The higher order crack tip stress and electric displacement fields for FGPMs and HPMs are obtained by the eigen-expansion method. The stress intensity factor and electric displacement intensity factor are obtained explicitly.

Abstract: To explore of houttuyniae cordata quercetin best extraction solution and detection of quality standard about houttuynia spray. The study extracted quercetin from houttuyniae cordata using alcohol water extraction, ultrasonic extraction and supercritical CO2 extraction respectively, and then choosed the best solution to prepare sprays of houttuynia cordata. To conform the state pharmaceutical quality standards, quality standards were detected from four aspects in spray volume of each press, particle size, injection experiment and installation. The method of oultrasonic extraction was the best extraction method, and the concentrations of 70% ethanol was the most efficient extraction of quercetin.The technology of spray preparation is fast and feasible, and the method of content detection is reliable.These results showed houttuyniae cordata could develop spray and conform the state pharmaceutical quality standards.

Abstract: A kind of peptide based Ni (II) complexes (general formula [ZN=C(An)-C(An)=NZ](NiBr₂)₂, Z=(4-NHR-3,5-C₆H₂(CH₃)₂)₂CH(4-C₆H₅), R=dipeptide, An=acenaphthenequinone) has been synthesized. Ethylene oligomerizations were carried out by using those complexes in combination with ethyl aluminium sesquichloride (EAS) and produced olefin . The effects of important parameters such as temperature and EAS concentration. on the catalytic activity and the distribution of resulting oligomer were investigated. under the conditions of employing toluene as solvent, a reaction temperature of 50°C and an ethylene pressure of 1.0 MPa..

Abstract: A kind of N-((3-chloro-1H-indol-2-yl) methylene)-2,6-diisopropylbenzenamin Ni (II) complex has been synthesized. Ethylene oligomerizations were carried out by using those complexes in combination with methyl aluminoxane (MAO) and produced olefin. The effects of important parameters such as temperature and MAO concentration. on the catalytic activity and the distribution of resulting oligomer were investigated.