Advanced Materials Research Vols. 989-994

Abstract: this study intends to compare through the experiment research of potassium permanganate, Fenton reagent, sodium persulfate, hydrogen peroxide, four kinds of commonly used oxidant chlorobenzene in contaminated soil, the removal effect of O-O-dichlorobenzene;, selected a typical ground soil bioremediation is the best antioxidant effect. Research under the condition of different on the dose, 4 kinds of oxidants to chlorobenzene and O-O-dichlorobenzene; removal effect. Combined pollution ground soil properties screen of chlorobenzene in contaminated soil, the highest removal rate of dichlorobenzene oxidant and best delivery dosage, to apply typical ground soil bioremediation, the results show that the effect is the best Kmno4.

Abstract: A series of 4-morpholinothieno [3,2-d] pyrimidine derivatives containing chromone moiety (5a-5e) were synthesized and their structures were confirmed by ¹H NMR and MS spectrum. The synthesized compounds were evaluated for their cytotoxicity against three cancer cell lines (PC-3, H460, SGC-7901). Two of them exhibited moderate cytotoxicity and high-selectivity against one or more cell lines. At 10μM levels, the inhibition rate of compound 5c against SGC-7901 cell lines was 58.9%, and that of compound 5d against PC-3 cell lines was 56.4%.

Abstract: Haydite as filler, selecting canna as wetland plant denitrification effect of vertical flow constructed wetland research. In terms of the mechanism of denitrification, in view of the ceramsite adsorption, microbiological nitrification and denitrification reaction, plants absorb test in three aspects and to study the effect of various factors. Adsorption experiment, ceramsite to NH₄^+_N adsorption reached the maximum at 4 h, adsorption intensity is 0.0045 mg/g, device of NH₄^+_N in the running 92 days maximum theory is 1296 g. Microbial average intensity of nitration was 0.750 mg.h^-1.kg^-1. The denitrifying intensity of 1.090 mg.h^-1.kg^-1. Canna root, stem and leaf nitrogen content were increased by 7.73%, 7.73% and 9.92% per plant cannas average of 1.189 g, nitrogen absorption during the running period of 10 plants absorb about 11.89 g. Vertical flow constructed wetland, the choice of spherical light ceramsite substrate adsorption strength, suitable for packing of wetland. Canna better effect on the absorption of nitrogen, of the three microbes plays a main role for denitrification.

Abstract: The effect of post-weld heat treatment (PWHT) on carbide precipitation and impact properties of coarse-grained heat-affected zone (CGHAZ) of Q690 Steel was studied in this paper. Carbide particles precipitated primarily at prior austenite grain boundaries and martensitic lath boundaries. When the PWHT temperature is 520–570 °C, temper embrittlement occurs. This temperature range is also where the number of carbide particles per unit area at grain boundaries reaches its maximum. The high number of particles per unit area increases the rate of crack initiation at grain boundaries under rapid loading; linking of microcracks along grain boundaries which are already weakened by impurity segregation results in TE and intergranular fracture.

Abstract: The polypropylene/sisal fiber composites were prepared by twin screw extruder and vane extruder, respectively. The tensile test specimens perpendicular to the extrusion direction and parallel to the extrusion direction were prepared from the extruded composites, respectively. SEM observation showed that fiber orientation of sisal fiber in the composites was not obvious when the content of sisal fiber not more than 15wt%. When the content of sisal fiber was 15wt%, the ability to orientate of sisal fiber in the composite prepared by vane extruder was better than that of in the composite prepared by twin screw extruder, which the fiber orientation of sisal fiber was obvious along the extrusion direction in the composite. Tensile tests showed that the tensile properties of the composite parallel to the extrusion direction with 15wt% sisal fiber prepared by vane extruder were the best compared with other composites in this work. The results illustrated that the orientation of sisal fiber in the composites was beneficial to the improvement of the tensile properties of the composites.

Abstract: Chopped carbon fiber (CF) reinforced PBS/CF composites were prepared by twin-screw extrusion processing. The effect of adding a certain quantity of CF in composites on the tensile, flexural and impact properties have been investigated. The results indicated that the tensile properties, flexural properties and impact properties of the PBS/CF composites were first improved and then decreased with the increase of the content of CF.

Abstract: This experiment used the response surface methodology to optimize the treatment effect of electrochemical oxidation degradation of landfill leachate. The relationship between current intensity, aeration and pH value was studied by the response surface methodology. The analysis of quadratic polynomial regression and response surface was studied by Design expert7.0 software, and the model was optimized.

Abstract: In order to research the resistance characteristic of silicon-based composite tiles under high temperature thermal load on aircraft during its reentry into the earth's atmosphere, the ordinary resistance measurements were comparatively discussed according to the operational environment of composite, two parallel electrodes probe test method was proposed, and the resistance test platform under high temperature thermal load was developed, by which the resistance characteristic of silicon-based composite tiles was continuous monitored under different thermal load. The result shows that: If the temperature is not higher than 600°C, the resistance will increase with the decrease of temperature until it reached the resistance value at room temperature; If the temperature is higher than 700°C, the resistance characteristic will be changed everlastingly; If the temperature is higher than 800°C, the resistance will be less than 1kΩ and will not change any more.

Abstract: s: Jilin university innovation experiment Electrical Simulation Experiment and the Analysis of Thermal Conductivity of Materials aims to solve the problem of thermocouple measuring tenderness in error. Thermocouple is used to measure temperature when measuring unsteady heat conduction in laboratory. The improved measuring method of unsteady heat conduction puts the breakthrough on the electric simulation method. The text bench is constructed by different shapes of conductive plate which is made of the graphite conductive paint, and voltmeter is refitted by diodes and controlled transformer. Through the test bench, we finished the simulation of unsteady heat conduction under the similar thermal conductive boundary conditions. Finally, the error analysis of experiment and the advantages of electric simulation method are given in this paper.

Abstract: The experiment uses municipal sewage as the research object and runs SBR reactor in completely aerobic conditions. Through controlling different of DO concentration and COD concentration, we study spreading comparison. The results show that when DO concentration was 1mg/L, the removal effect of aerobic granular sludge process in SBR treating municipal sewage was best, the average removal rate of COD, ammonia nitrogen, total nitrogen and phosphorous was 90.12%,98.95%,87.65% and 83.74% respectively. When COD concentration of influent was about 400mg/L, the treatment effects of aerobic granular sludge for COD, ammonia nitrogen, total nitrogen and phosphorous were all better, the average removal rate was up to 92.33%,98.83%,88.17% and 80.25% respectively.