Advanced Materials Research Vols. 347-353

Abstract: Soil microbial properties have been proved to be powerful indicators of soil quality. This study analyzed the changes in soil moisture content, soil bulk density and porosity, soil organic carbon, total nitrogen, and microbial biomass of Substrate in vegetation restoration of Rock Slope. The results showed that soil moisture, soil porosity, organic carbon (OC), total nitrogen (TN) and microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and C/N increased significantly, and soil bulk density decreased gradually compared with bare rock Slope. Therefore, the results suggested that the vegetation restoration of Rock Slope could improve soil quality.

Abstract: The economic feasibility of solar wall system was assessed with RETScreen software for 15 widespread locations in northern China heating region. Several different economic and financial indicators were calculated, such as the internal rate of return, net present value, simple payback and benefit-cost ratio. Results showed that the solar wall system was only profitable for four sites according to the current domestic price of solar wall plate and its absorptivity. When the price was reduced or the absorptivity under the condition of invariable price was improved, there were more sites profitable for this system. So, only when the price of energy increases 95% or the price of solar wall plate falls 50%, the solar wall system will be profitable for all sites in northern China heating region.

Abstract: Pure form,single phase and high crystalline zeolite 4A samples were synthesized during hydrothermal treatment of by-products in polysilicon production process. The effects of the different crystallization time on the degree of crystallinity, skeleton structure, morphology, size of the particle and its distribution of zeolite 4A samples were investigated using XRD,FT-IR,SEM and Zetasizer. The results indicated that the zeolite 4A sample featured high crystallinity degree, excellent dispersivity, high purity and single structure.

Abstract: Based on WSN,GPRS,embedded system,database and Web server technology,a system of collection,storage and release for field information was designed.The WSN network is responsible to collect field information,such as air temperature,humidity, illumination,image and so on. The information collected can be not only save in gateway's embedded database,but also transferred to the long-distance Web server.Which solve the farmland monitoring information storage, distribution and mobile measurement of inconvenience issues. Solar power supply module has the role of long-term supply power.Experimental result shows the system can accurately and timely collect information agriculture farmland.

Abstract: This paper summarizes the working experiences in prevention and treatment of flooding accidents caused by goaf water in Zhangcun Coal Mine, Pingdingshan Ruiping Company, and puts forward a number of scientific, practical and effective methods for it, including “inspection”, “exploration”, “dredging”, “drainage”, “prevention”, “hiding” and “management” . In addition, the methods discussed in this paper have great significance for safety production in coal mines and helps to improve the recovery rate of shallow coal bed in area where small coal mines concentrate.

Abstract: Laboratory and pilot scale experiments indicated that the diatomite additive could improve the stability of activated sludge process and the efficiency of COD removal for coal gasification wastewater treatment. In this paper, the effect of diatomite additive on biomass respiratory activity was studied to investigate the enhancing mechanism. Experimental results showed that diatomite additive could enhance biomass activity obviously when the biomass activity was inhibited by the wastewater with total phenols concentration of 188.9 mg/L -501.2 mg/L. It could be concluded that the mechanism of diatomite enhancing biomass activity were its adsorption of phenols and concentration of DO.

Abstract: On account of the spreading problem of resistance gene and off-target effects of functional gene products expressed by bacteria, pMG36e, a plasmid with the erythromycin- resistance (Emr) gene, which could shuttle between Lactobacillus and E. coli, was reconstructed into a non-antibiotic secretory expression vector with the beta-Galactosidase (β-Gal) gene for selection, then linked a secretory signal peptide sequence to the non-antibiotic resistance vector, thus the secretory non-antibiotic resistance vector was constructed. Finally, to test the vector's function, the SO7 gene of Eimeria tenella (E. tenella) was cloned into the vector and expressed successfully. This system may be used as a model to explore the feasibility of vaccine vectors using the β-Gal gene for selection, and collect fundamental data for expressing other homogeneous and heterogeneous functional genes in such a novel vector.

Abstract: The combustion behavior of fixed carbon in supercritical water was explored by a batch reactor. Effects of reaction parameters such as reaction temperature, time, oxygen stoichiometric ratio and stirring rate were investigated. Fixed carbon was difficult to burn out, even if in a harsh condition the conversion of fixed carbon was only 51%. It is determined that for the temperature below 450°C, the process of oxidation was limited by the reaction rate between oxygen and particle surface. For the temperature above 550°C, the rate of oxygen mass transfer to the particle surface was the rate-limiting step. In the transition zone of temperature, surface reaction was comparable to mass transfer in limiting reaction rate. Only trace amount of carbon monoxide was produced at 500°C, and no carbon monoxide was detected at 600°C.

Abstract: Among the investigated clays and minerals (kaolinite, natural zeolite, manual zeolite, bentonite, sepiolite, sepiolite amianthus, tremolite amianthus, vermiculite and baritite), the baritite clay was selected as the optimal adsorbent for aqueous Cr (VI). The Cr (VI) adsorption capacity on baritite clay reached as high as 39.01 mg∙g−1 at 20°C. Then the adsorption kinetics of Cr (VI) by the baritite clay were investigated in details. Results showed that the pseudo-second-order model was a suitable description for the adsorption kinetics and fitted well with the experimental data.

Abstract: Six wethers were used in a replicated 3 × 3 Latin square to study the fermentation quality and nutritive value of total mixed ration (TMR) silages which included wet green tea grounds (WGTG). The TMR silages were prepared using compound feed, corn, soybean meal, timothy hay, alfalfa hay, dried beet pulp and vitamin-mineral supplement, with soybean meal and alfalfa hay being replaced by WGTG at 0, 10 or 20% on dar matter (DM) basis. All TMR silages, irrespective of WGTG addition, were well preserved with low pH and ammonia-N content, and high lactic acid content. Increasing concentrations of WGTG in the rations decreased the digestibility of DM, organic matter, crude protein and energy (P < 0.05). The total digestibility nutrients and digestible energy contents of TMR silages at 0% and 10% WGTG were similar, however, the TMR silage at 20% WGTG was lower (P < 0.05). With progressive increases in WGTG concentrations, intake nitrogen, urinary nitrogen and retained nitrogen did not differ, but the fecal nitrogen increased (P < 0.01). This study demonstrated that the proportion of WGTG to be incorporated into TMR silages should not exceed 10% of the DM.