Abstract: Ceramisite concrete was charateristic of size effect as common concret. Through the experimentation of size effect on cubic compressive strength and axial compressive strength,and analysed and research coefficient of size effect by classical theoretics,elicit size effect of ceramisite concrete.
Abstract: Single roll caster to cast strip with sound free solidified surface was invented. A scraper was attached to the single roll caster to improve the free solidified surface. AA5182 and AA6022 strips were cast using the single roll caster equipped with the scraper. Mechanical properties of the strip were investigated by tension test, bending test and deep drawing. Mechanical properties of the strip cast by the single roll caster were as same as those made by DC casting.
Abstract: Purpose: The purpose of this study was to study the compositions of the polygonaceae medicinal plants called rumex root. Methods: Solvent method and chromatography was used to purificate the chemical compositions of Rumex, and the molecular structure of the compound was identified by physical and chemical properties and spectral data. Results: Two compounds were obtained from the ethanol extract of rumex root, which were identified as Chrysophanol and Physcione. Conclusions: Experimental basis was provided for the further study of the active ingredients of rumex root and the development and utilization of medical resources.
Abstract: A hygiene property of leather shoes, which has great influence on health and comfort, mainly contains air permeability, water vapor permeability, hygroscopic, heat preservation and antimicrobial ability. The developing situation of test technology on hygiene properties of leather shoes is summarized. Natural leather has excellent hygiene properties for its collagen fibers, each hygiene property is not isolated and there are complex relationships between them. But the properties are studied separately basically. It is necessary to launch an overall point of analyzing and testing hygiene properties of leather shoes. Grey system theory is introduced to determine the weightiness of each factor of hygiene properties, and decide which factor should be improved and which ignored. The prospect of analyzing the hygiene properties using gray system theory and establishing a testing standard of hygiene properties of leather shoes are forecast.
Abstract: Effect of hydrothermal process on xonotlite crystal prepared from K2SiO3 and H2SiO3 respectively in CaO-SiO2-H2O system was researched in this paper. The crystal phase composition and morphology of the xonotlite crystal were analyzed using XRD and techniques. The results indicate that different hydrothermal process poses significant impact on the microstructure of xonotlite crystal. The xonotlite spherical particle with the diameter of 10-20 µm was prepared from H2SiO3 only via dynamic hydrothermal process. The xonotlite whisker prepared from K2SiO3 with the length of 20-40 μm, diameter of 400 nm and the aspect ratio of 50-100 was successfully prepared from K2SiO3 via dynamic hydrothermal process, while with the length of 5-10 μm, diameter of 500 nm and the aspect ratio of 10-20 via static hydrothermal process.
Abstract: The different pH values in CaO-SiO2-H2O systems were taken into account to prepare xonotlite whiskers without any surfactant, special instruments and synthesis conditions. Effect of pH values in system on the crystallinity and morphology of synthesized xonotlite whiskers was studied by using XRD and SEM techniques. The results indicated that the different pH values in system had little effect on the crystallinity of synthesized xonotlite, but posed significant impact on the morphology of xonotlite whiskers. The higher pH value is, the lager scale xonotlite whiskers appear. Little whiskers were synthesized in the system of pH 11.5, but in the system of pH 13.0, the formation of xonotlite whiskers was promoted and xonotlite whiskers with 20-40 μm in length and 400 nm in diameter were prepared at 225 °C for 15 h.
Abstract: The material systems were taken into account to prepare xonotlite whiskers without any surfactant, special instruments and synthesis conditions. Effect of material systems on the crystal phase and morphology of synthesized xonotlite whiskers was studied by using XRD and SEM techniques. The results indicated that the different material systems had great impact on the crystal phase and morphology of synthesized product. The xonotlite crystal could be formed both in C-S-H and C-S-K-H systems, while the formation of xonotlite whiskers was promoted and the large scale whiskers were prepared at 225 °C for 15 h only in C-S-K-H system. In the C-S-N-H system, the synthesized product was pectolite but xonotlite.
Abstract: A challenge method composed of digital image correlation (DIC) method, circle coordinate grid technology and finite element (FE) software to conduct strain measurement of bimetal is presented. This approach can carry out the prediction and measurement of strain. The coordinate grids are painted on top and bottom surface of bimetal when experiment and simulate specimen. Each node is named a fixed number in turn, and these numbers can precisely help to identify the same name point between FE software and the experiments specimen. The bimetal sheet has been tested using DIC software, circle center of the coordinates points can be accurately identify on the surface of bimetal. The changing of distance between adjacent points is computed to construct the forming limit diagram before and after forming. It is an effective means to evaluate the forming performance of bimetal and verify the reasonable of FE analysis results. 2A12 metal is conducted experiment using the challenge method in this paper, bimetal has not conduct experiment due to some reasons.
Abstract: In the present study, the experiments were investigated with effecting of sucrose, lactose, glucose, maltose on survival of Lactobacillus acidophilus during freeze-drying. In order to reach sufficient numbers viable cells, so different concentrations of protective agents were designed in the experiment, which as 3%, 6%, 9%, 12% and 15%, respectively. Measuring the survival ratio of Lactobacillus acidophilus and number of viable cells after completed drying. There were significant differences in survival during freeze-drying. Results showed that the protective agent was a critical factor affecting the survival of Lactobacillus acidophilus. In the experiments, the highest survival rate was soluble starch as the protective agent, and when the protective agent as galactose the number of viable cells was largest.
Abstract: Surface treatment was carried out on the cruciform joint of 16MnR steel by using the HJ-II-type ultrasonic impact machine. The impact current is 1.2A, impact amplitude is 30 microns. Fatigue experiments were carried out for impact treated specimen, impact treated and heattreated specimen and un-heattreated specimen. The effect of ultrasonic impact on the hardness of the weldment and weld toe was researched. The experimental results show that the fatigue life of the cruciform joint of 16MnR steel can be significantly improved through the ultrasonic impact treatment and the hardness of weld toe can also be promoted. Compared to the sample without impact treatment, its fatigue life was increased 692.52%. The hardness of weld toe was increased 31%. Compared to the sample with heat treatment, the fatigue life of impact specimen was increased 316.67%. Compared to the sample without impact treatment, the fatigue life of impact and heat treated specimen was increased 218.69%.