Advanced Materials Research Vols. 503-504

Abstract: In this essay, the charactristc index of the humidity controlling material is breifly illuminated, based on which, an observing experiment in a small enclosed box is made. According to the experimental phenomenon and the basic principles of the thermodynamics, the formulation of the humidity parameter in a closed space of greenhouse is derived, from the angle of two-phase equilibrium. We assert that the purpose of using B,the charateristic parameter, is to ensure that the temperature of the subjest is zero. So when the temperature is not zero, using this parameter will cause error. Since the imperfection of B, it is necessary to use another parameter, BT, which is derived according to the temperature of the subject and proved more reasonable, to reply the former one. Both parameters can reflect the combination of the material and the moisture, which relate to the binding energy. The humidity controlling character proves better, if the binding energy becomes closer to that of two pure water molecules.

Abstract: The present paper proposes a new purifying strategy which can be applied in rapid synthesis of nano-sized calcium phosphate based biomaterials. To understand the new preparation process, the synthesized nano-hydroxyapatite was investigated as model to explicate. The results showed that by using the new method, quantities of pure nano-HAP could be obtained, and the D-process efficiency could be adapted to improve to some extend. Comparing with traditional purifying processing, dialysis is efficient and much easier. It is anticipated that dialysis can be accepted an easy, efficient, promising feasibility strategy for nano-CP biomaterials mass production.

Abstract: In this paper, nano-Fe3O4 as sorbent was used to remove Congo red dye from aqueous solution, in order to investigate its adsorption properties. Fe3O4 nano-particles were synthesized by hydrothermal method, and were characterized by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray Powder Diffraction (XRD) to examine their size, morphology and property. The adsorption and removal of Congo red dye from aqueous solution on nano-Fe3O4 was studied in batch equilibrium experiments. These results showed an excellent adsorption capability for Congo red with a maximum adsorption capacity of 1395mg•g-1 at 20°C and pH2.0. It indicates that Fe3O4 nano-particles can be effectively used to remove color from wastewater containing dyes.

Abstract: The method of recycling waste solution of copper plating using cyanidation in laboratory involves the comprehensive utilization of waste solution in the electroplating field. The method includes the following steps: first, add activated carbon into the waste to remove the organic impurities, lower the temperature of the waste with cooling fin and form sediments to remove carbonate salt in it. Add sodium sulfide, alizarin into the waste, and the containing heavy metal element Pb2+, Zn2+ and Cr3+ in it precipitate through chemical reactions. Place the waste solution in the closed container and make cyanide hydrolyze to produce non-toxic sodium formate and ammonia by adding alkali and under heat and pressure conditions. It provides an easy and convenient method, which can effectively recover resources, and reduce pollution for recycling copper cyanide waste solution in laboratory.

Abstract: The article is based on the rubber crumb modified asphalt’s fundamental characteristics, paving a test road. Through test and compacted study of indoor pavement performance and technical index on-site, summarizing relevant experience, providing reference for similar engineering application

Abstract: In the electroplating process of acidic tin-plating in laboratory, temperature is required to control at 5 °C or so, but conditions of the laboratory is limited, the average temperature is above 5 °C, which leads to Sn2+ in the bath hydrolyze, produce Sn(OH)2 impurities, and part of Sn2+ in the anode oxidize to produce metastannic acid. As time goes by, impurities increase gradually and eventually lead to the bath not be recycled. This paper mainly studied on impurities in the waste after electroplating were synthesized after a series of oxidation, filter and reduction, which makes recycled materials recycled to the greatest extent, non-recycling materials buried deep after high-temperature incineration. After the experiment, stannous oxide and distilled water in the waste get recycled, and the purity of stannous oxide gotten recycled is above 99.5%, which can be reused.

Abstract: To investigate the effect of confining stress, deviation stress, moisture content and gradation type on resilient modulus of graded crushed stones, three types of graded crushed stone with three moisture content levels(optimum moisture content and ±2% of the optimum moisture content, respectively ) were used, and repeated loading triaxial (RLT) tests with twenty five stress levels were carried out. The RLT test results demonstrate that resilient modulus of graded crushed stone remarkably increases with decreasing moisture content and/or increasing confining stress; resilient modulus of graded crushed stone slowly increases, or minor decreases at the beginning and then slowly increases with increasing deviation stress at low stress state. Results also indicate that gradation type has a certain impact on resilient modulus of graded crushed stone.

Abstract: This article mainly introduced various properties of aloe fiber and yarn. Studies on properties of aloe fiber include the morphological structure, infrared spectrogram, fineness and single fiber strength. Studies on properties of aloe yarn include yarn strength, fineness uniformity, moisture content, yarn hairiness, and acid and alkali resistance.

Abstract: Two kinds of triazine herbicides (cyanazine and atrazine) in cucumber were analyzed by high performance liquid chromatography method coupled with pseudo imprinted solid-phase extraction (PISPE) as the clean-up arrays. The sorbent of PMISPE was synthesized by bulk polymerization using cyromazine as pseudo template and it could selectivly recognized cyanazine and atrazine from cucumber matrix. The mobile phase for separation and quantity analysis of cyanazine and atrazine was methanol-(0.8% acetic acid-water) (55:45, v/v) with a UV detector being set at 224 nm. The result showed that good linearity of the two trazine herbicides was obtained in a range of 0.004 µg/g ~ 0.400 µg/g with r2≥0.9996 and the recoveries at three spiked levels were ranged from 93.8% to 108.5% with RSD less than 3.4% (n=3).

Abstract: Analyzed the result computed of finite element heat transfer, discovered the temperature difference between the two sides of head is very small. Therefore its hot loss is very big. In addition, the temperature of dryer head flank is basically the same. Therefore the dryer head's heat dissipation can be simplified as a question of univariate heat conduction, also simplified to be a big plate heat conduction problem. This article offers simple algorithmic analysis of dryer head temperature field algorithm and the heat dissipation computation, and studied the head temperature computation and the heat dissipation analysis with a heat preservation board added. The importance that increased heat preservation board for energy conservation is pointed out.