Advanced Materials Research Vol. 800

Abstract: The pre-treatment of sulfuric acid methyl ester with gas chromatography-mass spectrometry (GC/MS) analysis techniques was utilized to study the difference of the organic acid content in different flue-cured tobacco leaf (L8-L12): from the bottom of the eighth leave up to the twelfth leave) and its influence on flu-cured tobacco quality. The results show that malic acid, γ-e ketone acid, citric acid, malonic acid, linolenic acid and palmitic acid had a higher content relatively in different flue-cured tobacco leaves and they are the main acidic components.The difference of total organic acids content from the eighth to the twelfth leave was L8>L9>L12 >L10>L11; The content proportion ranges of non-volatile acid, senior saturated fatty acid and senior unsaturated fatty acid in total organic acids were 88.49%~94.38%,3.01%~5.10% and 2.61%~6.40%, respectively. The difference analysis of organic acids content in different leaf position indicated that the organic acids content in the eighth and twelfth leaves was moderate and they could be considered as the superior and slap-up tobacco raw materials.

Abstract: Using Tamarix ramosissima Lbd. growing in the extremely arid regions along the lower reaches of Tarim River, Xinjiang, we preformed a series of investigations on the effects of weather, soil moisture and salt on the stem water potential (ψs) of T. ramosissima. We identified the leading environmental factors affecting ψs of T. ramosissima and detected the thresholds of the environmental factors. First, the soil moisture was the most important factor affecting ψs of T. ramosissima among all the environmental factors. While there was no minimum threshold of the soil moisture for T. ramosissima to absorb moisture from soil, the highest threshold of the soil moisture was 36%. When the soil moisture was higher than 36%, there was a significant change on ψs of T. ramosissima. Our study provides crucial empirical data for keeping the normal growth of T. ramosissima.

Abstract: High temperature ceramic filter is designed and implemented for purification of hot coal gas, and then an experimental system is build in order to test its filtration performance. The reverse-pulse-jet-cleaning is introduced in detail. Finally, field experiment has been carried out and the results show that the ceramic filter keeps a high dust control efficiency and long on-line stability.

Abstract: Effects of adding sepiolite and mycorrhizal in soil polluted by heavy metals on nutrient elements in maize were studied. Results of pot culture experiments indicate that sepiolite treatment and combined treatment of sepiolite and mycyorrhizals can promote phosphorus and calcium absorptions by shoots and roots of maize, and prohibit their absorptions of manganese and magnesium.The sepiolite treatment decrease iron concentrations in shoots and roots of maize. The combined treatment of sepiolite and mycorrhizals give no significant effect on iron concentrations in shoots. The treatments of Glomus mosseae and Glomus intraradices give no significant effects on concentrations of phosphorus and calcium in shoots and roots, but decrease magnesium concentration in them. They show no evident effect on concentrations of iron and manganese in shoots, but increase the manganese concentration in roots. The treatment of Glomus intraradices increases iron concentration in roots. The two kinds of mycorrhizals give different performances.

Abstract: Surfactant LAS and nanomaterial taxoite were used to study their effects on anthracene desorption from artificially contaminated soil. The results show that the desoption of anthracene from soil is affected by the type and concentration of materials. Two type of materials with low concentration dont improve anthracene desorption from soil. While, they could enhance the desorption process with the concentrations increasing, especially surfactant LAS. The desorption and solubility ratios of anthracene from soil are 18.55% and 17.11% with the concentrations of surfactant LAS being0.2g/g. However, their ratios are only 3.91% and 2.21% with nanomaterial taxoite.

Abstract: A Technology of eco-friendly chemical conversion coating on magnesium alloys by phosphate-permanganate was studied. The performances of blank sample and chrome-free chemical conversion coating on Mg-based alloys were studied. The morphology and corrosion resistance of chemical conversion coating were tested by metallographic microscope and corrosive test. The best technology condition is that the concentration of KMnO4 is 20g/L, Na3PO4 is 100g/L, KF is 40g/L, and the pH is 7~8, the temperature is 50°C．The time of the chemical conversion is 40min.

Abstract: A new sorbent (PAMAM4.0GASG) with gallic acid as functional group has been prepared based on G4.0 polyamidoamine dendrimer modified silica gel (PAMAM4.0SG) and characterized with FTIR. It was employed for selective separation, preconcentration and determination of lead in different samples by flame atomic absorption spectrometry (FAAS). Experimental conditions for effective separation and preconcentration of lead were optimized. The preconcentration factor reaches 200 for lead. The relative standard deviation (R.S.D.) under optimum conditions was 2.1% for 5.0 μg ml¹ of Pb (II).The relative standard deviation (R.S.D.) was 2.1% for 5.0 μg ml¹ of Pb (II). The limit of detection (LOD) of 0.081μg ml¹ was achieved with a sample loading flow rate of 4.2 ml min¹ and a 10 ml sample volume in the proposed method. The proposed column enrichment method was applied for the preconcentration/separation and determination of Pb (II) in tap water and river water samples successfully.

Abstract: We have investigated the recovery of lycopene from tomato processing waste (TPW) by treating the peel fraction of the waste with pectinolytic and cellulolytic enzyme preparations. To optimize the enzyme-assisted extraction, we used a two-level factorial design with five factors: extraction temperature (T), pretreatment time (P), extraction time (E), enzyme solution-to-solid ratio (R), enzyme load (L). A 7-to 16-fold increase was observed in lycopene recovery, compared to the untreated TPW. From a response surface analysis of the data, a second-degree polynomial equation was developed which provided the following optimal extraction conditions: T = 30 °C, P = 3.5 h, E = 3.2 h, R = 30 dm³/kg, L = 0.17 kg/kg.

Abstract: As the sign of social development, the vehicles and traffic flux have been increasing and have greatly influenced the ecological environment at the same time, especially on the cementitious based materials along roads as well as constructions. Heavy metal particle and ion absorption behavior and mechanism in cement materials were investigated and analyzed by means of ICP, SEM-EDS and XRD. The absorption mechanism was discussed and generalized.

Abstract: Through confined compression test and direct shear test, studied the mechanical properties of the same curing agent of different soil dredged mud, compared the difference of the same curing agent of different soil dredged mud. By confined compression test, the compression modulus of clay, silty sand and silty soil dredged mud after curing increases by 603.7%, 529.0% , 603.7% respectively. By direct shear test, the shear strength of clay dredged mud after curing increases to infinity; silty sands shear strength after curing increases by 209.1% in average; silty soils shear strength increases after curing by 147.5% in average. The compression and shear resistance of this kind of special curing agent for clay is best, silty sand second, but for the silty soil only has a little effect.