Applied Mechanics and Materials Vols. 99-100

Abstract: One of the construction sector's major contributions to the preservation of the Environment and sustainable development is the reuse and recycling of the waste materials it generates (reducing, reusing, recycling and regenerating the residues that originate the constructive activity). With this view an experimental program was undertaken which helped in judging the effectiveness of using Recycled aggregate in concrete ,by assessing the properties of Recycled aggregates – Coarse and Fine. Further with the guidance of IS 10262:2009 ,Concrete mix was designed for 28 day compressive strength as 25N/mm2 using conventionally used aggregates and Recycled aggregates. From economy perspective an attempt was made to use superplasticser to reduce cement consumption. With reference to the experimental results, analysis of important properties of both the types of concrete is done and the suitability of use of recycled concrete aggregate for new concrete is judged.

Abstract: How to reconstruction traffic accident promptly and precisely is stakeholder’s goal. However, most traffic accident data records are incomplete was found. Exploring the reasons, people forgets to keep scene in complete because of saving injuries, recover the traffic or moving incident for escaping penalty. The minimum information list record the emergency data people have to record in first time. The research came from when three dimension reconstruction method is used, there is a gap with respect to reality. How to ensure the reconstruction animation conform to real situation. The minimum information list is a good way. The idea also can apply to other perspective.

Abstract: Based on the computational fluid dynamics (CFD) theory and numerical simulation methods, the seal cavity flow field for the bellows mechanical seal under such the high temperature, high pressure, high-speed as complex working conditions was numerically simulated, and the temperature field, velocity field, pressure field, turbulent kinetic energy and the flow field vorticity distribution of the medium of the seal cavity were obtained, the three-dimensional fluid flow in the seal cavity, the heat transfer characteristics and the impact on the sealing performance were analyzed in this researching.

Abstract: In order to investigate the novel preparation methods of calcium (II) sulphate crystal whisker materials, an anhydrous calcium (II) sulphate crystal was prepared by the reaction of taurine with calcium carbonate. The calcium (II) sulphate crystal material was determined by X-Ray single crystal diffraction technique. The results show that the calcium (II) sulphate crystal belongs to orthorhombic, space group Pnma with a = 0.88567(14) nm, b = 0.56639(12) nm, c = 0.72642(13) nm, V = 0.36440(12) nm3 and Dc = 2.482 Mg/m3. The calcium (II) sulphate crystal molecules form coordination polymers by the interaction of calcium (II) with sulphate. The prepared anhydrous calcium (II) sulphate crystal materials have potential application in light weight building materials and refractory coating.

Abstract: For thousands of years, Lanzhou city has long history and bright culture, and has numerous historic buildings and cultural relics. But with the rapid development of the city, many cultural heritages had been destroyed. The cities appearance are becoming more and more similar, urban culture roots has not clear, the city began to become unfamiliar. The reason is the local residents have a lack of cultural identity to living environment. City square, as a major public urban space. By a sense of spiritual civilization, it should be a window of the city and essential building space to daily life of local residents; it also bears an important responsibility which is heritage city in cultural context. Based on the Yellow River in Lanzhou City, and the study of the new square design concept, analyzed and summarized, presented the concept of square design to create a historical and cultural context of urban culture, the importance of heritage and modern artistic expression should be united with urban history and culture diversity, to make people re-establish the cultural identity for the city to gain ownership in their spirit.

Abstract: Funeral building environment is part of the ecological system, it undertakes important duties like human burial, urban cultural landscape and tourism, and urban development. Funeral building environment landscape as patch design is the important tache of space landscape construction and development. It should aim at restoring local ecological environment, providing city environmental services, and helping to recover ecosystem and biodiversity that have been destroyed. It will repair the damages like biological component damage caused by urbanization, natural biological communities and species declining and urban ecological system stability destruction, so as to promote the development of funeral building ecological environment, and create a development environment with man and nature in perfect harmony.

Abstract: Bismuth vanadate (BiVO4) powders were synthesized by complexing Sol-Gel method using citric acid as chelate,calcined at different temperature and characterized with X-ray diffraction (XRD), scanning electron microsoope（SEM）and specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. It revealed that temperature values can influence significantly on the morphologies and structures of the products.It also found that the sample prepared with the molar ratio of citric acid to metal inons be 2:1, pH=7 and calcinated under 400°C for 5 hours was pure monoclinic BiVO4 phase.In this conditions, the sample had highest photocatalytic activity with the photodegradation rate was about 94% or so in 20min under 250W halogen lamp.

Abstract: The drilling cutting gas desorption index △h₂ is one of the most important indexes for the prediction of coal and gas outburst. Based on the mathematical and physical model of the gas diffusion of coal particles, the analytical solution of △h₂ was deduced. The relationship between the drilling cutting gas desorption index △h₂ and parameters of gas occurrence such as the gas diffusion coefficient, adsorption constants (a and b), gas pressure, and ga_{Subscript textSubscript text}s content were studied. The results show that △h₂ increases and gas diffusion resistance decreases with the gas diffusion coefficient. The drilling cutting gas desorption index △h₂ increases with the adsorption constant a, and the two meet the linear relationship. △h₂ increases with the adsorption constant b and the raising rate gets lower gradually. And, △h₂ increases with the gas pressure, and the two meet the power relationship with very high correlation coefficient.△h₂ and gas content are in linear relationship.

Abstract: Aiming at the situation that surveyors are difficult to determinate the additive constant and unable to set corresponding constant of the totall station when the lens's constant is unknown, propose the triangle law, which could determinate the lens's additive constant neglecting the effection of multiplication constant. As the triangle law's model is quite complex, it is too difficult to known the formula of precision, monte-carlo principle is used to calculate the additive constant and assess additive constant's accuracy in this model. Finally, illustrated the application of triangle method by an example.

Abstract: The paper firstly introduces mining remote sensing monitoring and the specific implementation situation briefly, and then points out the necessity of the evaluation for the implementation effect of mining remote sensing monitoring. According to the role of "Operability, Integrity, Key and Dynamic” and on the basis of the goal of “Effect, Effectiveness, Efficiency” which is called “3E”, the paper constructs the index system of the evaluation for the implementation effect of mining remote sensing monitoring. At last, the author not only gives his own opinions for the method of the evaluation for the implementation effect of mining remote sensing monitoring, but also presents the specific roadmap of the work. It has reference significance to promote the evaluation for the implementation effect of mining remote sensing monitoring in the whole country