Advanced Materials Research Vols. 396-398

Abstract: Hydrargyrum(Hg) and arsenic(As) in tap water of Chongqing University Town were detected by the X-atomic fluorescence spectrometry, and the United States Environmental Protection Agency (USEPA)-supported Health Risk Assessment Model was used for evaluating the potential health risk to surrounding residents caused by Hg and As in tap water. The results showed that the average concentration of Hg and As in tap water of this region were 0.6323μg/L and 20.1237μg/L respectively, wherein the Hg content was lower than the national Standards for Drinking Quality (GB5749-2006), but the As content exceeded its stipulated level, the annual personal risk level of health hazard caused by Hg and As by the way of drinking water were 2.840×10^-8•a^-l and 1.350×10^-4•a^-l, wherein Hg would not cause apparent harm to exposure population, while As was higher than the maximum acceptable risk level by the way of drinking water（5×10^-5•a^-l）recommended by the International Committee on Radiological Protection (ICRP).

Abstract: In this paper, polyethylenepolyamine and hexanedioic acid were used in the polycondensation reaction for Polyamide-Polyamsne, which is the intermediate product that synthesis of Polyamide-Polyamsne-Epichlorohydrin. The difference and contact between polyethylenepolyamine, diethylenetriamine (DETA) and triethylenetetramine (TAPA) in the polycondensation reaction were compared. The exploration of the polycondensation reaction was discussed. The reaction between polyethylenepolyamine and hexanedioic acid was similar to the reaction between hexanedioic acid and DETA to TAPA. The appropriate conditions of polycondensation reaction were as following: The molar ratio of polyethylene polyamine and hexanedioic acid was 1:1. The polyamide-polyamine were synthesized by keeping 130 ~ 1350C for the first 30min, then increasing to 1600C and keeping for 2h. The solid content was about 50 %. And through theoretical analysis of gel, the degree of polymerization of Polyamine polyamide intermediate increases with increase the degree of reaction.

Abstract: With the increasing demand for high quality steel, various secondary refining techniques have been developed in the past decades. RH powder top blowing process (RH-PTB) is practiced in industry to decrease the impurity content of steel in a more economical way. In the present work, based on similarity theory, RH powder top blowing process was simulated by water model, and the effects of operating parameters on mixing time were investigated. The results show that the injected powder had a negligible effect on mixing time in RH-PTB, and the mixing time increases with top lance gas flowrate and decreases with lifting gas flowrate of up-leg. It was found that the mixing time was no longer decreasing as the lifting gas flowrate was over 15 L/min. Moreover, the height of top lance has some effect on mixing time in the reactor, and it should be adjusted to specific circumstances for purposes.

Abstract: A new copper(Ⅱ) complex derived from N-(4,6-dimethylpyrimidin)-N’-(ethoxycarbonyl) thiourea was synthesized. The crystal is of monoclinic, P21/n, a=10.228(2), b= 11.429(2), c= 13.390(3) Ǻ, β =104.05(3)º, V=1518.3(5) Ǻ3 and Z = 2. Its crystal and molecular structure shows two N-(4,6-dimethylpyrimidin)-N’-(ethoxycarbonyl)thiourea molecules coordinate to copper(Ⅱ) through single dentate of the nitrogen atom.

Abstract: Abstract. This study discussed the effect factors of biodegradation on phenanthrene by P.putida. The outcomes showed that the optimal temperature conditions was 35°C, and the optimal pH was pH7.5, and that under the shaking condition increases the availability of phe. The effect of glucose increase in the concentration of glucose showed repressive effect. Moreover, the presence of salicylate increased the phenanthrene degradation to some extent. Phenanthrene degradation in presence of succinic acid did not differ significantly, this implies that the presence of other carbon sources does not completely inhibited. Therefore, phenanthrene may be co-utilized by p. putida along with other substrates. And that the addition of non-ionic surfactants bring about further phe biodegradation, the biodegradability of phe is greatly improved in presence of surfactants at proper concentrations. The phenanthrene was degraded higher efficiently at higher phe concentrations under the presence of fluorene, phe and fluorene present an obviously co-metabolism.

Abstract: Under high pressure, materials will show certain properties, which are different from its performance under normal conditions, even making the metal materials to insulator or semiconductor. It’s very important for synthesizing new materials. In view of the complex changing behavior of the electronic structures and optical properties of the alkali metal in loading conditions, absorption spectra, refractive index, and reflectivity of the three alkali metal (Li,Na,K) were investigated by using the first-principles method under Hydrostatic Pressure in this thesis.

Abstract: Abstract: Because there are cyclical phenomenons in lives so that the influence of the medicine on oscillating reaction is becoming a hotspot.The author prepares a pharmaceutical intermediate. It is 2,6-dihydroxy-4-methylpyrimidine.In this paper the influence of the pharmaceutical intermediate on BZ oscillation system have been studied at different temperature and different concentration. For instance, dropping the concentration of 0.01mol/Lpharmaceutical intermediate before and after, apparent activation energy E and E’ of the systems are 68094J/mol and 71786J/mol.Higher temperature and higher concentration,oscillating cycles and amplitude are lower.

Abstract: The surface of potassium titanate whisker (PTW) was coated with Al2O3 derived from NaAlO2 solution via a liquid deposition method, and coupling agent KH570 was used to treat the surface of Al2O3 coated PTW. Scanning electron microscope (SEM), X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and surface contact angle measurement were used to characterize the effect of surface modification. The results showed that the surface of PTW was uniformly coated by Al2O3 nanoparticles. After modified by KH570, the modified Al2O3/PTW showed better dispersion in ethanol solvent and the surface of modified Al2O3/PTW became more hydrophobic-lipophilic than that of modified uncoated PTW. It is indicated that the modified Al2O3/PTW could be dispersed much better than the modified uncoated PTW in organic phase.

Abstract: Main fan diffuser is equipment of energy-recycling for main fan. On the basis of technology situation of main fan, in the view of structural energy-saving of main fan diffuser, new way of energy-saving of main fan is discussed, and consisting diffusers and their technology level of structural energy-saving are summarized, and common problems of structural energy-saving of diffuser are deduced out, and consisting realization approaches of structural energy-saving of diffuser are reviewed, and technology approaches of structural energy-saving in related fields are overviewed. From the above, problems of needing to explore is prospected for structural energy-saving of main fan diffuser.

Abstract: The fine particles play a major role not only in complex processes of estuarine area but also in the distribution, transfer and transformation of pollutants in the estuarine environment. In this study, fine particles were detected and analyzed by flow cytometry in the Yangtze Estuary and the adjacent East China Sea. Two groups of organic autotrophic particles (R1 and R2) were detected by flow cytometry analysis. Another group of R3 was organic but nonliving, or inorganic particles. Particles of R1 and R2 only represent between 0.18% and 3.16% of total particles at the sampling stations. Particles of R3 dominated the estuarine stations. Their concentration had large fluctuations. We observed a seaward decrease in the number of organic nonliving particles and inorganic particles. Flow cytometry made it possible that study on the dynamics of fine particles. It is important in discovering the transfer mechanism and environmental behavior of fine particles in the estuarine area.