Papers by Keyword: Bottom-up

Abstract: The finite element calculation method was used and the principal stresses distribution in the asphalt pavement was analyzed. The damage index of the pavement structure is defined as asphalt pavement potential damage index(APPDI) based on the Drucker-Prager criterion, and the APPDI as the pavement structure damage index are applied. The results show that: (1) The most dangerous nodes of this example model appeared between rounds from the edge of round about 0 to 2cm and the place beneath the tire. The composition of the principal stresses are tensile and compression stress.(2) Failure modes are rutting and Bottom-up which are caused by tension-compression composite shear stress.

Abstract: Under the situation of rapid development of urban vehicles, worsening traffic congestion and the energy shortage, slow traffic system reflects concept of sustainable development of people-oriented and green environmental protection which is attracting more and more attention and recognition from the citizens. The efficient slow traffic system can not only save energy and alleviate the urban traffic congestion, but also improve the comfort and security of the citizens and guide them to form a new concept of green travel. In recent years, Guangzhou has set up the slow traffic system which based on the development of the Asian Games’ greenway, but on the detail design and user’s experience is questionable. This article will be based on the analysis and summary of the existing domestic and foreign slow system development model and the actual case studies. Then draw lessons from the experience, study the case of Ersha Island and combine with existing design of the greenway in Guangzhou. Use the bottom-up perspective to explore the slow traffic system design in central city of Guangzhou. In the future development, we should optimize for the detailed design in slow traffic system construction as well as the relevant planning and policy, and finally to promote the development of slow traffic system.

Abstract: As the U.S shale gas revolution evolved, there was a growing expectation that this can be replicated in China. Power sector, as the biggest contributor to China’s primary energy consumption and CO₂ emission, is faced with tremendous pressure and challenge. Shale gas resource will be a big opportunity for power sector to alleviate energy shortage and emission problem. This study is trying to figure out to what extent will future large gas supplies improve China’s energy structure and under which policy will the change be more efficient and cost-effective. Regarding the task, two scenarios are set up here: Base Case, Coal price rising and carbon emission control scenario. Based on the comparison of these scenarios, detailed conclusions for policy decision are drawn up.

Abstract: The rapid development of nanotechnology has opened up multiple areas of application of titanium silicide nanowires including microscopic fields, sensor and catalyst areas and electrode materials, as well as their potential applications in nanodevices. The preparation of titanium silicide nanowires can be summarized as top-down method and bottom-up method. Its necessary to find some simple and quick ways to prepare titanium silicide nanowires with the desirable pattern. Recent advances in manipulating titanium silicide nanowires are discussed with a focus on the progress of nanowire preparations and applications.

Abstract: Dimension feature recognition plays an important role in feature recognition in 2D engineering drawings. At present, in most dimension feature recognition methods, the first step is the recognition of whole feature, and then to extract feature information. These methods have some disadvantages, especially in exploded dimension feature recognition. Aimed to solve this problem, this paper introduces a new algorithm of intelligent dimension feature recognition. According to the position relationship with basic elements of dimension, the dimension is recognized in a bottom-up approach. This new method can solves the problem of recognizing the exploded dimension

Abstract: Human vision system exploits this fact by visual selective attention mechanisms towards important and informative regions. A computational model of combination both bottom-up and top-down simulating human vision system for machine vision inspection is proposed. In this model, top-down knowledge-based information is highlighted to integrate into bottom-up stimulus-based process of vision attention. The model is tested on inspecting contaminants in cotton images. Experiment result shows that the proposed model is feasible and effective in visual inspection. And it is available and quasi-equivalent to human vision attention.

Abstract: Modern resistive chemical sensors include discontinuous nano/mesostructures. Sensing performances are then governed by the chemical nature of the nanostructure gap as well as by the sensor design at the nanogap scale. Various top-down, bottom-up and hybrid fabrication routes of discontinuous/nanogaped metal nano and mesostructures have been developed. These structures are assembled/organized on insulating surfaces for integration of resistor based devices for the specific sensing of chemicals in gaseous as well as in liquid media. Hydrogen sensing based on discontinuous/gaped palladium nano/mesostructures is a chosen case-study for the evaluation of various nano/mesogap fabrication methods.