Abstract:The blending method was used to prepare nano-SiO2/epoxy composites, where nano-SiO2 was premodified using silane coupling agent. The influences of nano-SiO2 content on the microstructure, thermal stability and dielectric properties of SiO2/EP composites were studied by using IR, SEM, TGA, impedance analyzer et al. The microscopic mechanism of thermal stability and dielectric property evolutions of the SiO2/EP composites were also discussed. with the increase of nano-SiO2 content, the thermal stability of SiO2/EP composites gradually increased, while the dielectric constant and dielectric loss factor of the composites decreased first and then increased. When the content of nano-SiO2 equaled 4%, the nanoparticles exhibited a uniform dispersion in composite, its dielectric constant was 2.86, and its corresponding dielectric loss was 0.023 53.

Abstract:Highly dispersed SnO2 nanoparticels were synthesized at ambient conditions based on carbon microspheres, and the gas sensing properties of the material were studied systematically. The conductance responses of the material were measured by exposing it to ethanol gas (C2H5OH). It was found that the sensor exhibited better sensing responses to ethanol gas than the commercial SnO2 at the working temperature of 330 ℃. Furthermore, the gas sensor responses increased linearly with the increment of the gas concentrations of ethanol in the range from 5×106 to 200×106.

Abstract:Porous SiO2 anti-reflective coating were obtained through a sol-gel process using tetraethylorthosilicate and/or commercial nano-SiO2 sol as precursors under different catalytic conditions, the optical properties and porosities of the coated glass samples were measured and calculated. The influences of the porous structure of the coatings on its fastnesses and weatherabilities were discussed. Based on the results, the stepped base/acid catalyzed process and acrylic resin was used to further improve the structure of the coatings during the synthesis process. The final coated solar glass products, processed by industrial roller-coating equipment, can achieve a transmittance of 93.7% and meets the current product standards.

Abstract:The structural compositions and group changes before and after the thermal polymerization modification and the thermal polymerization modification with anthracite were investigated with FT-IR spectroscopy. The pyrolysis and polycondensation characteristics of the coal-tar pitch before and after the modification were studied with TG-DTG. And then, the modified mechanism was discussed by using Gas Chromatography-Mass Spectrometer method (GC-MS). The results showed that the aromaticity of the modified coal-tar pitch with anthracite modifier increased significantly. Anthracite promoted the polycondensation reaction in the process of heat treatment of the medium temperature coal tar pitch.

Abstract:The variations of complex shear modulus, phase angle , rutting factor and viscosity under different temperatures and different contents of bio-oil were investigated. Some problems on the ascertaining of mixing and compaction temperature on bio-binder based on the viscosity-temperature curve were discussed. This research showed that the high temperature performances of bio-binder decreased with the increase of temperature and content of bio-oil if the testing temperature was below 135 ℃. There is some aging on the bio-binder if heated too high， and the method of determining the mixing and compaction temperature on bio-binder has to be studied in the future.

Abstract:A porous chitosan/PEG/carbon nanotubes (CNTs) membrane with nanometer scale pores and good distribution was prepared by mechanical blending. Scanning electron microscope (SEM) images showed that 30~50 nm pores with homogeneous distribution appeared on the membrane when CNTs was added, and the porosity increased with the increase of CNT content. Methyl orange adsorption experiment showed that the adsorption quantity of the membrane increased first, and then decreased with the increase of the CNTs content. Copper sulfate solution filtration experiment showed that the water transport behavior of the membrane was improved with the addition of CNTs. At first, the water flux of membrane increased with the increase of CNTs content, but when CNTs content reached a certain value, the water flux decreased. The rejection rate of Cu2+ increased with the increase of CNTs content at first, and when CNTs content reached a certain value, the rejection also decreased.

Abstract:A polyaniline fibers (PANI-F)/ reduced graphene oxide (rGO) composite was synthesized by using self-assembly of PANI-F and GO followed by hydrothermal reaction. The morphology and structure of samples were characterized with scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FT-IR)and X-ray diffraction (XRD).The electrochemical properties were characterized with cyclic voltammetry (CV), galvanostatic charge/discharge(GCD) and electrochemical impedance spectrum(EIS). It showed that the rGO was homogeneously coated on the surfaces of PANI-F, and a high specific capacitance of 517 F/g (based on PAGO10 composite) was obtained at a current density of 1 A/g, compared with 378 F/g for PANI-F. Most of all, a high specific capacitance of 356 F/g was obtained at a current density of 10 A/g, compared with 107 F/g for PANI-F.

Abstract:The effect of retarders, the dosage of steel slag on the properties of alkali-activated steel slag-slag based cementitious materials and the hydration characteristics of complex binding material were studied by the determination of strength and hydration heat evolution as well as type of hydration products and micromorphology of hardened paste. The results show that the properties of the setting time and the strength of binding material, with a composition of steel slag of 40%, blast furnace slag of 60 %, alkali activator of 6% and retarder K of 1%, can match the standard of grade 42.5R ordinary Portland cement. The hydration heat release characteristics of alkali-activated steel slag-slag based cementitious materials are similar to alkali-activated slag cement, and the accumulative heat is limited. Steel slag and slag have a positive interaction, and the combination is beneficial to the development of the hydration process of the system.

Abstract:The effect of earth element Y addition on the creep properties and creep stress exponent of Mg-5.5Zn gravity cast magnesium alloy was investigated by using scanning electron microscopy(SEM),X-ray diffraction(XRD) and creep property testing at elevated temperature. The results show that, with the increase of yttrium content in Mg-5.5Zn (wt%)alloy ,three second phases,Mg7Zn3，Mg3Zn6Y(I-phase)and Mg3Zn3Y2(W-phase), are found. The variety categories and the increasing volume fraction of the second phase cause the increase of the creep resistance obviously. Compared with Mg7Zn3 phase, rare earth phases have a high melting point and it have a stronger effect for reducing the creep rate of alloy in the same given creep conditions. When the applied stresses are 50~60 MPa at the temperature 448 K, the calculated stress exponent n is 5.2, 3.2, and 2.2, respectively for the as-cast Mg-5.5Zn-Χ%Y(Χ=0.7,1.5,3.5)alloys. The results indicate that the rate controlling mechanism of Mg-5.5Zn-0.7Y alloy at 175 ℃/55 MPa and 200 ℃/55 MPa is respectively the dislocation creep and power law breakdown，and the creep mechanism of Mg-5.5Zn-(1.5,3.5)Y two alloys is dislocation viscous motion at the applied stresses of 50~60 MPa and the temperature of 448~473 K.

Abstract:In order to improve the drawability of Al-1.1Mg-0.3Cu alloy wire rod, the microstructures and mechanical properties of continuous extruded and conventional drawn and annealed alloys were investigated by observation of optical microscopy, transmission electron microscopy and scanning electron microscopy and tensile testing. The experimental results show that continuous extrusion forming produced a finer, more uniform structure, with fewer precipitates and lower dislocation density, than that resulting from conventional drawing followed by annealing processing. Increased tensile elongation, lowered work hardening rate, and enhanced drawability resulted from continuous extrusion processing. The fracture surface of the material prepared by continuous extrusion presented deeper and finer dimples, compared with that of the conventionally processed material.

Abstract:The hot deformation behavior of pure nickel with coarse, columnar grains at the temperature range of 950~1 150 ℃and the strain rate range of 0.001~10-1 was investigated in the Gleeble-3500 system. The results showed that flow stress increased with the increase of strain rate and decreased with the increase of temperature. The relationship between flow stress and strain rate and temperature was represented by the Zener-Hollomon parameter and the apparent activation energy of 312.4 kJ/mol. The optimum processing parameters were obtained by using processing maps based on the dynamic material model and microstructural observation at the deformation temperature of 1 060~1 120 ℃and the strain rate of 0.03~0.2 s-1.

Abstract:The quantitative characterization of the atomic structure of bulk metallic glass plays an important role in deeply understanding its individual physical properties and mechanical properties. Some cylindrical Zr55Cu35Al10 bulk metallic glass specimens were prepared with a suction casting in a copper mold, the pair distribution function (PDF) was obtained by neutron diffraction, and then, the tight bond cluster was defined in the present work. In addition, the local atomic structure of Zr55Cu35Al10 bulk metallic glass was simulated by ab initio molecular dynamic (AIMD). A large number of tight-bond clusters were extracted from the results and simulated in association with the quantitative characterization of sizes, which were abundant in the ideal tight-bond cluster model at present.

Abstract:A method was established to measure the separation factor of electrode material for electrolyzing alkaline aqueous solution. The (n1,g(D)/n2,g(H)) ratio of mixed gases from electrolysis was determined quantitatively with cryogenic gas chromatography (GC) when we electrolyzed alkaline aqueous solution that deuterium oxide and hydrogen oxide contain 30% of the potassium hydroxide. The (n1,l(D)/n2,l(H)) ratio of alkaline aqueous solution after electrolysis was tested quantitatively with the infrared spectroscopy, and then, the separation factor of different material was obtained according to the formula of separation factors. This method can be used to evaluate the separation ability of different electrode material for deuterium and hydrogen, which is helpful in the search of excellent electrode materials.

Abstract:Doubly Modified Waterborne Polyurethane Curing Agent was successfully synthesized with Hexamethylene diisocyanate (HDI) and Trimethylolpropane (TMP) as the main materials, Polyethylene Glycol 400(PEG400) as the nonionic modifier and sodium hydroxyerthyl sulfonate as the ionic modifier. The properties of the curing agent and films such as gloss, hardness, solvent resistance, and water resistance were significantly affected by the amount of PEG400,sodium hydroxyerthyl sulfonate and the reaction temperature , reaction time and the ratio of dispersion to curing agent. The optimum performance was obtained with the content of PEG400 and sodium hydroxyerthyl sulfonate reaching 15.8% and 3.17%, and the reaction temperature and time were kept at 80 ℃and 3h, and the ratio of curing agent to dispersion was 1.4~1.6. Furthermore, the synthetic process of the curing agent and film properties were characterized by FTIR and SEM, etc.

Abstract:Activated carbon (AC) was modified with microwave irradiation heating at 600, 700 and 800 °C respectively. The physicochemical properties of the activated carbon were characterized by using Boehm titration, Fourier transformed infrared spectroscopy and Specific surface area and pore size analyzer. Fixed-bed adsorption experiments were conducted by using 1,2-dichloroethane as the adsorbate. The results show that, after microwave modification, the surface acidic functional groups of activated carbon decrease and the surface basic functional groups increase with the increase of temperature. The specific surface area and total pore volume of activated carbon decrease, while the micropore specific surface area increases. The order of the adsorption capacity for 1,2-dichloroethane is AC-800 > AC-700 > AC-600 > AC-0.The results of the grey relativity analysis show that the physical properties of the modified activated carbon have a larger effect on the adsorption capacity than the surface functional groups. The fitting results of D-R model and kinetics equation illustrate that it is a physical adsorption process for activated carbon.

Abstract:S2 strain that highly produces biosurfactant was screened from the oilfield water of three plants in Daqing Oilfield in the rapid screening method, and the S2 strain was identified as Bacillus sp.. Through FT-IR and ion identification test, S2 biosurfactant was identified as nonionic lipopeptide biosurfactant. This experiment treated emulsification index (E24) of S2 strain fermentation broth as the object. Through response surface optimization method, the culture conditions (inoculum, pH, temperature and rotation speed) of the S2 strain were optimized. On the basis of response surface model, the optimum pH value was 7.2 and the temperature was 43.5 ℃, inoculation of 5.2% (V/V), rotation speed was 162 r/min through the quadratic regression equation. Under the optimal condition, the best E24 of S2 strain fermentation broth was 81.20%.

Abstract:Bioinformatics analysis indicates that the promoter of OsBBX30 contains function element HSE, which is related with adversity. In this study, it is found that OsBBX30 gene expression is induced by heat stress, which enhances the E. coli heat resistant ability through bioinformatics,Gene clone prokaryotic expression and real-time quantitative PCR analysis. The results are helpful in understanding the family genes and rice heat resistant genes.

Abstract:This paper adopted high-performance liquid chromatography-mass spectrograph (HPLC-MS) to investigate the occurrence and seasonal changes of tetracycline antibiotics in the Xiang River and its sediments. Five representative antibiotic resistance genes (tet A, tet C, tet G, tet M, tet X) in water and sediment samples were quantified with real-time PCR. The concentrations of tetracycline showed sensitive seasonal changes, ranging from 16.23 ng·L-1 to 496.73 ng·L-1 in the water samples, and from 347.77 ng·kg-1 to 3 829.75 n·kg-1 in the sediment samples, respectively. The target resistance genes were detected in all samples. Compared with other resistance genes, tet A and tet C were higher in absolute copy number and relative abundance, suggesting that the tet A and tet C were dominant in the Xiang River. Statistical analysis indicated a positive correlation between the relative abundance of tet A and tet C in the water samples and the sediment samples in winter. There was no linearly relationship between antibiotics and resistance genes.

Abstract:This paper discussed the pollution characteristics and their sources of Hg, Cd, Cr, As and Pb in the bottom sediments of Songhua River in the Hakanson's Potential Ecological Risk Index Method (RI) and Principal Component Analysis (PCA) to reveal the metal pollution status of the whole Songhua River, which is the biggest tributary of the Heilongjiang River at the China-Russian border. The results showed that: the concentration order from high to low by average was wCr>wPb>wAs>wCd>wHg; the coefficient of variation (CV) revealed that the spatial distribution of Hg and As was discrete and Cd and Pb were homogeneous. In the method of PCA, the main sources of heavy metal pollutants were inferred. The Eri of Hg and Cd was higher，and the RI analysis uncovered that the potential ecological risk declined compared with the past, and just the 4 sections of 1#，2#, 7# and 10# were in moderate level only.

Abstract:Based on USEPA framework of health risk assessment, the multi-pathway health risk assessment model was developed for heavy metals in the case soils. Monte-Carlo simulation was adopted to quantitatively study the effect degree of parameter uncertainty on assessment result, and sensitive parameters were further identified by sensitivity analysis. The results without Monte-Carlo simulation showed that there was no non-carcinogenic risk because of 1＞HICd＞HINi while it was under carcinogenic risk due to RCd＞1.0×10-6. However, with the Monte-Carlo simulation of selected variables, it indicated that the parameter uncertainty made the non-carcinogenic risk assessment results varying within 0.1~0.2, and the carcinogenic risk assessment results varying in the range within 1 order of magnitudes. Therefore, the parameter uncertainty made the value range of RCd span 1.0×10-6 and it was probable to mislead the corresponding decision-making. Sensitivity analysis indicated that the contents of Cd in case soils and vegetables, and the weight for the target receptor should be treated as sensitive variables, which were the main source of parameter uncertainty. To further improve the credibility of assessment with cost-benefit consideration, data of the sensitive variables should be preferentially gathered.

Abstract:In order to improve the current situation of dust concentration exceeding the limits in belt conveyer roadway,to explore the main influencing factors of dust concentration distribution, according to the similarity theory and the gas-solid two-phase flow equation motion, a similarity model device was designed for the specific situation in belt conveyer roadway. Fluent, which is a software of computational fluid dynamics, was used to analyze the dust concentration distribution in belt conveyor roadway of the similar model. Compared with similar experiment data analysis, the simulation result was consistent with the experimental data. The results show that the average wind speed in the roadway and the speed of the belt are the two main factors affecting the dust concentration distribution. When the average wind speed of the roadway is 0.15 m·s-1 ~ 0.60 m·s-1, the greater the wind speed, the lower the dust concentration. When the Tape speed is 1~ 2.5 m·s-1, the greater the speed, the higher the dust concentration.

Abstract:A new annular photocatalytic reactor was designed for the removal of indoor formaldehyde. Three fins were added to the reactor and each fin had a triangular gap at one end, making this type reactor continuous and single-pass. The influence of fins on formaldehyde removal was examined in an airtight environmental chamber. The radiation and velocity fields of the reactors were simulated by using computational fluid dynamics (CFD) methods. A theoretical model for the degradation of formaldehyde in a recirculating system was proposed. When adding fins in the annular reactor, the reaction area and residence time were greatly increased, and the degradation rate was, therefore, obviously enhanced. The CFD simulation results showed that the radiation intensity on the internal surfaces of the exterior cylinder was nearly uniform except for the two ends and it decreased slightly for the reactor with fins. The velocity distribution was uniform in the first tube pass and became actually higher near the elbows. The UV intensity was weak while the velocity was large near the elbows, which had a negative effect on degradation efficiency there. The results obtained from the kinetic model were in agreement with experimental data. So the degradation behavior of formaldehyde could be predicted by using this kinetic model.