Advanced Materials Research Vols. 989-994

Abstract: Based on the perspective of saving investment and reducing dust emission, the method of experimental study and the working principle of windbreak wall were adopted in this paper to explore the affection of the dust emission on sand stockpile by the height of windbreak wall and natural wind speed. According to the experimental testing, the data processing and analysis by the origin software, the studied results indicated that, the dust emission of the same particle size of powder (sand) increased with increasing the wind speed, the dust emission of the same particle size and the same wind speed of powder reduced with increasing the height of the windbreak wall., When the height of windbreak wall is 5/6 times of the height of the stockpile for a certain height of the bulk stockpile, the dual purposes of the minimum dust emission of bulk stockpile and saving investment could be gained. In the practical engineering application, the height of the windbreak wall should be chosen according to the actual situation (the density of the stockpile, particle size as well as the local wind speed).

Abstract: Spherical steel slag filter material with high porosity, large specific surface area was made by using steel slag as the main raw material, adding binder and pore forming agent. The influences of PH, phosphorus concentration and adsorption time on the adsorption effect of steel slag filter material were investigated. The adsorption characteristics of steel slag filter on phosphorus were studied based on adsorption isotherm model and adsorption kinetics model. Adsorption results were used to fit Langmuir and Freundlish formula. The correlation of Freundlish model was significant and the correlation coefficient was 0.92907.

Abstract: The traditional tube-shell absorber is relatively too bulky to be used in a small absorption chiller for solar air conditioning. As the outer-surface of solution film on the traditional absorber surface is easier to be saturated, several alternate heat and mass transfer absorber schemes have been proposed. However, the film-inversion absorber uses only half surfaces while the dual-side film-inversion absorber scheme is of good performance but too complicated to fulfill. The scheme using stainless steel mesh packing as the film guider is much easier and more uniform in distributing film, and it can also act as the framework for exposing dual-side film to the vapor for adiabatic mass transfer. The alternate heat and mass transfer configurations with plate surfaces and mesh packing are of promising performance for small chiller absorbers.

Abstract: Electromagnetic wave absorbers can be widely used in Electromagnetic Compatibility (EMC). We proposed a novel multilayer structure of metal alloy-ferrite-plastic composites. A new structure with Frequency Selected Surface (FSS), which has filter characteristic, embedded in the composites was fabricated to improve the absorption performance. In bandwidth of 8.04GHz, the reflectivity was smaller than-8dB and the thickness was only 2.6mm. The reflectivity was measured using a standard NRL Arch technique in a frequency range of 3-18 GHz. The experimental results indicate that it is possible to make a desirable thin, broadband EMW absorber by the incorporation of an FSS into the magnetic absorbing materials.

Abstract: Orthogonal experiment optimization of adsorption conditions with the factors of pH value, adsorption time, adsorbent amount of brilliant cresyl blue wastewater by brewer's grains were studied. The results showed that optimum adsorption conditions were as follows: 100 mL brilliant cresyl blue dye solution of 150 mg·L^-1,adding 5.0 g·L^-1brewer's grains of 60~80 mesh and adsorbed for 2.0 h,extraction temperature 30°C,pH 5.0. Under the optimal conditions, the maximal absorption rate got 95.12%.The brewer's grains is a promising, cheap, efficient, new biological materials of adsorption for brilliant cresyl blue in wastewater.

Abstract: Treatment phosphine gas with absorption oxidation, let gas went through the oxidant solution. Use concentration of sodium hypochlorite 1%-8% (w/w) as oxygenate, the absorption rate of phosphine [φ] was various form 41% to 61%. Compared with the other phases, such as hydrogen peroxide, potassium permanganate, iron trichloride, sodium hypochlorite is better as oxidation agent in the process of phosphine gas absorption oxidation.

Abstract: The aim of this test is to study the effect of treating COD_Cr, NH₃-N, TP and turbidity of sewage with addition of coagulant PAC by using technology of combining vortex-grid flocculation tank with inclined tube sedimentation tank. The results show that the removal rate of devices treating COD_Cr, NH₃-N, TP and turbidity are 68.36%, 22.22%, 82.60% and 80.90% respectively after the stability of the device operation on the condition that the dosage is 25 mg/L and the optimum flocculation time is 17 min.

Abstract: By the coagulation-flocculation jar test, the PAC adsorption property and coagulation removal property of Atrazine and Chlorothalonil, and influence on removal effect of Atrazine and Chlorothalonil by PAC Adsorption and Enhanced Coagulation in combination have been acknowledged, with different doses of PAC or polyaluminium chloride. The results of test showed that PAC can absorb Atrazine and Chlorothalonil effectively, and that the removal effect of the enhanced coagulation for Atrazine and Chlorothalonil is affected by coagulation effect. Enhanced coagulation cannot remove Atrazine effectively, while it can remove 75% of Chlorothalonil. PAC adsorption and enhanced coagulation in combination can remove Atrazine and Chlorothalonil effectively. For the initial concentration of 0.1 mg/L of Atrazine, dosage of 60mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 98% removal efficiency, and make treated water standard. For the initial concentration of 0.1 mg/L of Chlorothalonil, dosage of 20mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 90% removal efficiency and make treated water up to standard.

Abstract: Graphene oxide was modified with phenyl isocyanate first, and then reduced by a two step method-reduction with hydrazine hydrate first and an additional reduction in H₂/Ar. The reduction with hydrazine hydrate in the first step can effectively remove the epoxy groups on the graphene, and the disposure of reduced graphene oxide (RGO) with H₂ will change the residual amides and carbamate esters into conjugated C=N-ph structure. The introduced phenyl isocyanate not only acts as a functionalized group to prevent the aggregation of graphene but also will increase the electron concentration because of additional benzene. The resulted functionalized graphene can well dispersed in DMF, and the electrical conductivity of the functionalized graphene can reach 3.42×10⁴S/m,which is far high than the method only reduce with the chemical reductant or H₂/Ar. The prepared functionalized graphene is beneficial for the fabrication of graphene-based polymer nanocomposites. The conductivity of resulted modified graphene/PMMA composite with 5wt% filler content is 3.2S/m.

Abstract: Supersonic turbulent mixing layer requires high spatiotemporal resolution of measuring techniques to study its aero-optical effects. However, the spatiotemporal resolution of existing techniques is not high enough. NPLS-WT (NPLS based wavefront technique) is a new aero-optics measuring technique developed in 2010. Its time resolution is 6ns, and spatial resolution and time correction resolution can reach up to micrometers and 200ns respectively. NPLS-WT was used in this paper to study aero-optical effects induced by Mc=0.5 supersonic mixing layer. The fine wavefront aberration information is revealed by the OPD of high resolution. The results show that the wavefront in near field is not sensitive to the resolution, and large-scale structures play a dominant role on the wavefront in near field. The cumulative effects analysis show us that the density difference between large-scale structures and free stream is the main reason to wavefront aberration, and the larger the vortex is, the more obvious the effect to wavefront aberration is.