Materials Science Forum Vol. 980

Abstract: The effect of ultra-high pressure technology on the extraction of polysaccharides from Huangshan Stone Ear was studied. The effects of solid-liquid ratio, pressure and time on the yield of polysaccharides from umbilicaria were investigated by single factor experiment, and the experiment was optimized by response surface experiment design. Under the conditions of pressure maintaining time of 14.36 min, pressure of 303 MPa and ratio of solid to liquid of 1: 54, the theoretical yield of polysaccharides was12.85±1.32%, 1.18 times as high as that of hot water extraction and 1.39 times as high as that of ultrasonic-assisted extraction. This experiment proved that it is feasible to use ultra-high pressure technology to assist in the extraction of stone ear polysaccharides. Meanwhile, the ultra-high pressure technology also has the advantages of high efficiency, environmental protection and low temperature requirement, which provides a new and efficient method for extraction of polysaccharides from umbilicaria.

Abstract: This paper summarizes the use of antibiotics and the current situation of bacterial resistance and explores the specific causes of bacterial resistance. Several commonly used and emerging detection techniques are described and compared. Finally, several measures and methods to reduce bacterial resistance are proposed.

Abstract: Target fishing, a cutting-edge technology for drug research and development, plays a significant role in drug discovery. Varieties of methods for finding small-molecule drug targets have come into being driven by genomics, proteomics, bioinformatics and other technologies. These new methods are mainly based on the expression of gene or protein and proteins properties, including affinity and stability and so on. A serious challenge for the most widely used small molecule drugs is the discovery and identification of biological (and potential therapeutic) targets. Herein, we enumerate five biological target fishing techniques, including surface plasma resonance (SPR) techniques, random photo modified probes, drug affinity responsive target stability, fishing-rod strategy, and photo affinity labeling. And then we introduces the principles of operation, practical applications in the biological field of five methods, and analysis of their shortcomings.

Abstract: RETRACTED PAPER:Labrang Monastery is the only main monastery of the Gelug Sect of Tibetan Buddhism in Gannan area. From the perspective of building materials and technology, this paper carries out literature research and fieldwork in order to comb and summarize the main construction of monastery buildings and common building materials. Furthermore, it systematically analyses the architectural phisics, (acoustics, optics and thermotics) of monastery buildings via methods such as research, servey and data analysis. These above have positive referential value for the protection and renovation of Labrang Monastery and the modern design of regional religious buildings as well.

Abstract: In order to respond to the construction policy of "economy, application, green and beauty" put forward by China in the new period, the assembly structure has gradually become the focus of attention in recent years. Compared with the traditional cast-in-place structure, the assembled structure is more in line with the requirements of energy-saving, material-saving, environmental protection, etc. Therefore, it is of great importance to further study the seismic performance of assembled structures. However, existing assembled shear wall structures often suffer from problems such as the joint position is difficult to construct because of its wet work, and strong component weak nodes often appear. The seismic performance of the joints needs to be further studied and so on. Aiming to solve above problems, a new type of pre-stressed constraint assembled shear wall structure was proposed by us. The structure is connected by pre-stressed tendon to shear wall, and there is no wet operation at the construction site, which is conductive to improving construction quality. When the earthquake occurs, the structure can increase its self-shock period by changing its own stiffness, so as to reduce the earthquake stress. Meanwhile, many conditions to improve the ductility of the structure do not need to be considered, thus avoid the waste of steel materials. Based on the time history analysis of cast-in-place shear wall structure model and pre-stressed shear wall structure model, the results of calculation show that: compared with cast-in-place shear wall structure, the pre-stressed shear wall structure can effectively reduce the earthquake effect by about 90%.

Abstract: As the problem of asphalt concrete bridge deck pavement is becoming more and more serious, how to improve its road performance has become the focus of the study. As the lack of shear strength and bond strength between layers, flaking, raveling and other diseases were occurred on steel bridge deck asphalt pavement. This paper combines the common damages of bridge deck and asphalt concrete pavement in cold area of northeast region, focuses on the analysis of the cause of asphalt concrete pavement damage causes, puts forward preventive measures and recommendations, and present the bridge deck pavement structure in cold area combined with the engineering practice. The research results can effectively guide the construction of bridge deck pavement.

Abstract: The purpose of this study is to explore the forms and characteristics of reflection crack in asphalt overlay of old cement pavement, so as to provide reference for effective prevention and treatment of reflection crack.By means of ANSYS finite element software, considering the coupling effect of temperature and vehicle in different working conditions, the influence of cooling on asphalt overlay was analyzed, and the location and form of crack were discussed.The analysis results show that tensile crack and shear crack are more likely to occur near the joint of old cement pavement, and shear crack is more likely to occur in areas outside the joint, about 1/2 wheel length from the joint of cement pavement.The prevention and treatment of crack at different locations should be carried out according to different working conditions.

Abstract: Based on the background of sponge city, this paper discusses the necessity of studying permeable bricks from the permeable pavement, reviews the research on permeable bricks of industrial waste in China and abroad. Based on the mutual exclusion of materials and permeable bricks, a comparative analysis was carried out. Finally, the optimal permeable brick bricking method and a new type of cementing material—geopolymer were proposed.

Abstract: In order to investigate the shear capacity of prefabricated beam, experiments about shear bearing were performed on one integral pouring contrast beam and two prefabrication and assembly beams. Inspecting the relationship between load and deflection under the load, the development regularity of strain between longitude reinforced and stirrup, the shear capacity of cracking load and ultimate bearing capacity, analyzing failure mode of oblique section and connection performance of old and new concrete in the groove, and compared with the mechanical properties of cast-in-place concrete beam. The experimental results indicate that: prefabrication and assembly beam and cast-in-place beams have similar shear bearing capacity and failure mode of oblique section, along with the load level continues to increase, the groove joint stiffness weakened, but has little effect on the overall deformation.

Abstract: In order to consider the fluctuating wind load induced fatigue problem of long span suspension bridge, fatigue reliability formula is modified by assuming the fatigue life is accord with the weibull distribution. Based on the accurate bridge buffeting analysis of time history, the stress time history of components of a suspension bridge in east sea China is simulated, and then the fatigue damages and reliabilities are calculated. The results indicate that the main cables and hangers have enough fatigue reliability under the fluctuating wind load, the fatigue failure will not occur; the stiffening girder has larger fatigue damage, under 40 / (m.s-1) mean wind speed action, the girder of mid-support section’s average fatigue life is only 3.103 years, so the girder’s damage under strong wind action should be taken seriously.