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The AlSn20 coatings on bearing alloy were deposited using magnetron sputtering technology. The influence of tin target current on the microstructure, hardness, corrosion resistance, bonding force and friction coefficient were analyzed. The results show that when the tin target current are in the scope of 0.19A ∼0.25A, with the decreasing of it, the coating changes from rough structure to fine structure...
The fate of soluble pollutant concentration along the process structures was studied and the actual function of selector tank was discussed in two full-scale oxidation ditch systems of Xi'an city. Samples were taken randomly in winter and autumn after tracking the WWTPs for 3 years because sludge bulking was easy occurred in this season. The results showed that the selector tank was the potent structure...
The absorption coefficients of 4H-SiC at 200 – 400 nm were obtained by extrapolation and polynomial fitting methods. Considering the effect of different junction-depth on the spectral performance, the continuity equations of photo-generated minority carrier were used to theoretically calculate the responsivity of p+-n−(i)-n-n+ structure 4H-SiC ultraviolet photodetector (PD) and to find out the effect...
Based on a nonadiabatic dynamical method we have studied the dynamical process of scattering between a pair of oppositely charged solitons in trans-polyacetylene chain in the presence of an external electric field. It is found that the oppositely charged solitons scatter into an exciton when they move close enough to each other. However, the exciton is not stable and is decomposed into a pair of solitons...
The objective of this study is to determine the effects of acetic acid, propionic acid, lactic acid bacterial, cellulose and urea additives on the fermentation qualities of whole-plant alfalfa growth in the first year. From the results, all additives except for urea significantly improved the fermentation quality of alfalfa and decreased pH and ammoniacal nitrogen content. The interaction of additives...
Acrylic acid was introduced on to O2 plasma pretreated LLDPE membrane surfaces by UV induced graft polymerization without photo initiator. Then the functional LLDPE copolymers was obtained by using chitosan as graft monomer. The surface properties of functional graft copolymers were characterized by ATR-FTIR, contact angles, XPS and SEM. It showed that the surface wettability of grafted LLDPE was...
Steady cavity flow of 2-D hydrofoil is simulated by CFD software. The impacts of different cavitation model to the numerical simulation results are analyzed. The pressure distributing curve and volume fraction distributing map are obtained through the detailed analysis to the cavity flow under different cavity number. The analysis results show that those cavitation models simulate the origination...
Shock wave is the main reason for the formation of dust pollution at the high-drop transferring point. The transferring point of Hei Daigou coal preparation plant is taken as an example, By using the calculation theory of air shock wave, the technical parameters in dusting system of transferring points are determined. The result shows that, when the distance between dust catcher and the intersection...
In this paper, Cu-Ce/TiO2 nano-particles were synthesized by sol-gel method with copper nitrate Cu(NO3)2·3H2O, cerium nitrate Ce(NO3)3·6H2O, and Ti(C4H9O)4. Their photocatalytic activities were evaluated by degrading formaldehyde gas under visible light irradiation. The photocatalytic activity of Cu-Ce/TiO2 nano-particles, in the visible light, is influenced by Cu-Ce-doped loading (A factor), Cu-Ce...
Off-lattice MD-simulations of polyelectrolyte brushes in good solvent are compared with various different mean-field theories. We demonstrate the importance of excluded volume effects under the present solvent conditions, which had intentionally been left out in some of the classical mean-field approaches of Pincus or Zhuina et al. We evaluate the accuracy of the Debye-approximation in the simulations...
Using coconut-water as main culture medium, carboxymethyl cellulose -bacterial cellulose (CMC-BC) materials were obtained by Acetobacter xylinum through adding CMC as substitute carbon source in static cultivation. When 0.6% (w/v%) CMC was added into the medium, the yield of dried film reached 10.41g/L compared to 4.73 g/L in the control. The FT-IR spectra of the CMC-BC showed the absorption of a...
To find out heavy metal pollution in and ecological risks of the sediments in Daliaohe Estuary, 19 surface sediment samples were collected from Daliaohe Estuary and analyzed for contents of Cu, Pb, Zn and Cr. The Indices of Geo-accumulation and Mean Sediment Quality Guideline Quotient were employed to evaluate the pollution status and ecological risks. Similar results were obtained through these two...
Foodborne pathogens such as Salmonella can cause gastrointestinal illness if they are ingested with uncooked foods such as salad. Foods such as salad pose a greater risk because they are consumed raw and have been the source of major outbreaks of disease from fresh produce. SipA, one of Salmonella's effectors, is an actin-binding protein that is required for its efficient entry into host cells. We...
To forecast land use change is important for land use management, With the development And improvement of the society, to use the land resource reasonably and effectively has become more and more important Data collection and integrate analysis are important to forecast land use change. so, model of land use change be built by using mathematics, which can be joined GIS. By this way, it cans quantificational...
A model for the comprehensive turfgrass quality evaluation has been constructed based on the RBF neural network. The structure of the neural network model is described. And then the model is trained with samples and tested in MATLAB. Practice shows that the result has better precision and reliability comparing with other methods. With its fast convergence speed and good classification capability,...
Using Alfalfa silage as research materials, the research discusses the prediction of Near Infrared Spectroscopy (NIRS) on chemical compounds 121 samples of alfalfa silage. The results are as follows: the NIRS models of DM, CP, WSC have been set up. The RPD value for cross validation and validation are all above 2.5. The results show that the NIRS can accurately evaluate nutritive value of alfalfa...
Because of Bio-diesel outstanding environmental protection and renewable characteristic, more and more nations are paying attention to it. The content of free glycerin in Biodiesel is one of important targets to evaluate Bio-diesel. In the study, by using high capacity C18 SPE column to remain the major component(long-chain fatty acid alkyl ester) in Bio-diesel in order to eliminate its interfering...
Antofine and Cryptopleurine, natural products belong to the phenanthroindolizidine and phenanthroquinolizidine group of alkaloids, have attracted much attention because of their extremely potent inhibition of cancer cell growth. In this paper, seven analogues with different substituents on phenanthrene ring were designed and synthesized, the chemical structures of these derivatives were characterized...
This paper introduces the way of plasma production by dielectric barrier discharge (DBD) method, we did desulphurization experiment before the coal combustion without adding any chemical additives. The experimental results show that when the input voltage is 15 ∼ 20kV, the desulfurization effect come to the best, and the discharge is fully; desulfurization ratio reaches 17.6% (total sulfur). As voltage...
A fargoing heavy rain occurred on November 9 in 2009 in the middle and lower reaches of Yangtse River. There are also the gale, hail and short-duration heavy rain exist in Hunan, Hubei, Jiangxi, Zhejiang, Fujian etc. Analysis indicate that the severe convective weather occurred when the low pressure trough move eastward, then form cyclone and move into the sea at last. This disaster mainly caused...
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