Applied Mechanics and Materials Vols. 71-78

Abstract: It is very important to forecast the gas well productivity of gas reservoir accurately. On the basis of analyzing the parameter performance of support vector machine (SVM) for regression estimation, the paper proposes gas well productivity prediction model based on particle swarm optimization (PSO) and SVM. The parameter of SVM was optimized by PSO. This method took advantage of the minimum structure risk of SVM and the quickly globally optimizing ability of PSO. Compared with BP neural network model, the proposed GA-SVM model for gas well productivity in practical engineering has higher accuracy and speed, and the maximum error is 2.8% . Thus, it provided a new approach to predict the gas well productivity.

Abstract: An investigation was conducted on the adsorption of Cr(III) ions by a new kind of spherical cellulose adsorbent immolizated with phytic acid. The equilibrium adsorption data of the Cr(III) ions on adsorbent were analyzed by Langmuir and Freundlich models, and some kinetic parameters of the adsorption were calculated. Moreover, the adsorbent was also used to dispose the tannery wastewater sample, and the results showed that the spherical cellulose adsorbent had good application prospect in the treatment of tannery wastewater.

Abstract: Community development must aptly meet social needs in order to be sustainable. One such need, the psychological well-being of residents, is closely tied to the environmental quality of the community. In developing tourism, communities face the issue of impact on their environmental quality by influxes of visitors. Social carrying capacity is an important tool used in the environmental management of tourism areas to ensure the recreational quality. It is often assessed by visitors’ perception of crowding. Despite residents’ views being critical because their lives are directed impacted by the development of their community, no study has been conducted on residents’ crowding perception of their living environment. The characteristic of the environment is a key factor influencing crowding perception in addition to the use level. This study thus aims to examine residents’ crowding perception in reaction to various environmental characteristics in the community. ANOVA results indicate environmental characteristics carry a significant effect: at the same use level, natural and historical scenes were perceived to be more crowded than a recreational one. The findings help planners to better zone a community into multiple use areas based on residents’ crowding perception. In doing so, they can effectively minimize negative psychological impact on the residents, thereby protecting the environmental quality of a community.

Abstract: In this paper, two models are taken as subjects, one being a small frame exterior composite insulation system with the shear key, the other being the system without the shear key. In extreme high temperature conditions in summer, the small frame exterior composite insulation system temperature stress and strain are analyzed with numerical simulation using finite element method. Results show that shear key can effectively reduce the stress concentration, weaken the stress peak by nearly 50% and reduce the deformation by nearly 50% as well, thus effectively reducing the probability of crack cracking, improving the durability and extending service life.

Abstract: This paper takes a Chinese Changjiang River highway bridge as engineering background, and a kind of continuous three-dimensional (vertical, lateral and torsion)controllers which can apply in the large span cable-stayed bridge is presented. The controllers can control vertical, lateral and torsional response of bridge wind-induced vibration at the same time. Through comparative wind tunnel test of the bridge model with and without controllers, some important conclusions are made as follows: when the continuous three-dimensional controllers are installed on the bridge model, its flutter critical wind speed increases significantly (mostly increases 33.36%); Meanwhile, there is a certain degree of reduction in its RMS values of vertical, lateral and torsional angular displacement response.

Abstract: Earth folk houses refer to a type of traditional dwelling with their main structure built with raw earth through simple treatment without being baked in a kiln. The article discusses two types of folk houses found along Shandong Canal, including thatched earth cottages and shallow-vaulted earth cottages. It studies the layout, architectural features, building methods and materials of these buildings and explains their historical, cultural, and ecological significance.

Abstract: Eco-friendly and efficient resource allocation and comfortable building physical environment would play a key role in the architectural design of green hospital. In this paper, the issues of how to allocate resource efficiently, to utilize solar energy, to cut down the consumption of fossil energy, and to create the appropriate comfortable environment at the least cost of the energy consumption are probed from the respects of layout of master plan, combination of functional space, and indoor or outdoor physical environment.

Abstract: This paper describes the design and construction of the Foundation pit with steel sheet piles which is on a deep and small area, achieving good economic and social benefits.

Abstract: The influence of ultraviolet (UV) ageing on complex modulus, phase angle and low-temperature fatigue factor was studied by dynamic shear rheometer test. The ageing degree of the bitumen was evaluated by the rheological parameters. The results show that UV ageing causes an increase in complex modulus and fatigue factor, as well as a decrease in phase angle, indicating that the bitumen becomes more elastic after UV ageing process and is apt to crack at low temperatures. Different bitumen exhibits diverse changes in the rheological parameters after UV ageing, which is much dependent on the sources of bitumen.

Abstract: Buildings are large consumers of energy in all countries. According to the statistic, more than 40% of final energy is used in buildings. A reduction of the energy consumed in buildings is, for that reason, one of the priorities of the world. To achieve this goal it is necessary to reduce the heat loss by the selection of the building thermal insulation materials. Phase change materials could absorb or release a large amount of heat before melting or solidifying. And this unique property could help PCM in building applications to maintain the thermal comfort without using mechanical heating and air-conditioning. The paper is focus on a review of different types of phase change material for building applications. And it provides more information in this aspect.