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Analysis of the Relations between Highway geometric design and Traffic Safety in Bangladesh,China,and America

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Frontiers Research of Architecture and Engineering 2022年第1期5卷 19-25页

作者： Licai Zhang Kai Hua Fen Xiang China Railway Eryuan Engineering Group Co.Ltd.(CREEC) ChengduSichuan610000China

Transportation plays a critical role in the economic sector in *** its independence,infrastructure has been developing rapidly,includ-ing land,water,and air *** economy is increasing at a relatively high rate,leading to the better-off of people’s *** the living standards keep improving,people are more concerned about safety issues in *** article makes an analysis of the status quo of traffic safety in Bangladesh and compares the Bangladeshi code with American code AASHTO from the geometric aspects of horizontal and vertical align-ment,in an effort to provide reference to the highway design in *** a reasonable design,the traffic safety will be under control and accident rate as well as economic loss will be minimized.

关键词： geometric design Traffic safety Highway

Synthesis and Characterization of Fluoro- and Chloro-bimetallic Alkoxides as Precursors for Luminescent Metal Oxide Materials via Sol-Gel Technique

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Chinese Journal of Chemistry 2007年第7期25卷 998-1004页

作者： ATHAR.Taimur SEOK, Sang II KWON, Jeong Oh Indian Institute of Chemical Technology Uppal Road Tarnaka Hyderabad (A.P.) 500007 India Advanced Materials Division Korea Research Institute of Chemical Technology 100 Jang-Dong Yuseong-Gu Daejon 305-343 Korea

Heterobimetallic alkoxides are broadly recognized as versatile precursors for luminescence materials, and efforts are being made to develop novel routes by applying the concept of geometrical molecular design, for their synthesis and to design a single source precursor suited to photoluminescent materials. Novel and new series of bimetallic alkoxides has been prepared by metathesis route. They exhibit a lower sensitivity towards hydrolysis and so they are easier to handle as compared to other alkoxides. All the compounds were characterized by elemental analysis, FT-IR and multinuclear NMR spectroscopies. FT-IR revealed that the molecular structure of these metal alkoxides was retained to a large extent in 4 ： 1 halogenated alcohol-benzene solution. The heteronuclear NMR spectroscopy provided useful information about chemical shifts for better understanding the likely structure based on interactions with their coordinate metals. The mass spectra show similar types of fragmentation pattern. SEM-EDS analyses showed consistency with the formulation. XRD patterns show an enhanced homogeneity at high temperature. TGA measurements show that thermal decomposition occured in steps that depended entirely on the chemical compositions and the synthesis routes. SEM observation reveals that the morphology and particle size strongly depend on synthesis routes for their precursors.

关键词： precursor chemistry fluoro- or chloro-bimetallic alkoxide geometric design luminescent material

Automatic Horizontal Road design Information Extraction from Georeferenced Polygonals： A Brazilian Federal Highway Network Study

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Journal of Civil Engineering and Architecture 2015年第12期9卷 1513-1522页

作者： Alexandre H. Coelho Nataniel P. Borges Jr. Nicolas P. Borges Marcos D. Gallo Amir M. Valente Department of Civil Engineering Federal University of Santa Catarina (UFSC) Florianopolis SC 88040-970 Brazil Transportation and Logistics Laboratory (Lab Trans) Federal University of Santa Catarina (UFSC) Florianopolis SC 88040-970Brazil

Road geometric design data are a vital input for diverse transportation studies. This information is usually obtained from the road design project. However, these are not always available and the as-built course of the road may diverge considerably from its projected one, rendering subsequent studies inaccurate or impossible. Moreover, the systematic acquisition of this data for the entire road network of a country or even a state represents a very challenging and laborious task. This study＇s goal was the extraction of geometric design data for the paved segments of the Brazilian federal highway network, containing more than 47,000 km of highways. It presents the details of the method＇s adoption process, the particularities of its application to the dataset and the obtained geometric design information. Additionally, it provides a first overview of the Brazilian federal highway network composition （curves and tangents） and geometry.

关键词： Curve identification information extraction geometric design polygonal segmentation road.

Applications of Power Rail Track Program to Tracings of Brazilian Railways

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Journal of Civil Engineering and Architecture 2016年第4期10卷 501-512页

作者： Sonia Janneth Rosero Munoz Mhileizer Arielys Toledo Arenas Diogenes Cortijo Cost Cassio EduardoLima de Paiva Department of Civil Engineering University of Campinas Sao Paulo 13209201 Brazil

In Brazil, the use of software and applications in railway geometric designs is rare. Currently, after the division and privatization of the national rail network, the concessionaires who assumed the administration, are investing in modernization, recovery and extension of this transport model to make it more efficient. The PIL （Program of Investment in Logistics） has generated growth of the sector in response to the amount of investments, greatly enhancing the load capacity and optimizing the geometric design, which would allow speed of 80 km/h. Based on this information, the objective of this research is to verify the software applications of Power Rail Track Program of Bentley Systems, Inc. for geometric designs in future deployments of railways in Brazil. This software is based on numerical calculations, including roller adjustment by the least squares method to calculate and choose the best alignments, and regression tools, to a fast and effectively optimization of various parameters of the geometry for a future or existing railway. Different variables that allow you to optimize the geometric design are analyzed, considering several optional alignments and complex restrictions present in geometric design, taking into account variables such as circular curves, transition, tangents and rays. The software regression tools include curvature diagrams identifying points and curves, tangent and spirals. The analysis results are presented quickly and points can be added or deleted from the regression analysis, providing improved tracing. The software also allows to detail the elements of the executive project of the railway line such as rails, joints, turning points, waypoints and others. The result of this study has shown that the application of the Power Rail Track Program generates significant cost savings in time and increases in productivity, providing greater opportunity to optimize the geometry and reducing geometric design costs.

关键词： geometric design railways optimization software geometric tracing.

Implementation of an Available Parking Space Detection System in Hectic Parking Lots

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Journal of Transportation Technologies 2021年第4期11卷 688-701页

作者： Diana Laura Gómez-Ruíz Daphne Espejel-García Graciela Ramírez-Alonso Vanessa Verónica Espejel-García Alejandro Villalobos-Aragón Facultad de Ingeniería Universidad Autónoma de Chihuahua Chihuahua México

Parking automation has been developed for locating available parking spaces inside a parking lot with new technologies, such as automatic collection, capacity, or empty spaces’ detection;to both reduce search time and avoid crowds of vehicles waiting to park in it. A simple detection system of available spaces, within the Faculty and Staff parking lot of the Engineering and Chemistry Departments at the Autonomous University of Chihuahua, Mexico (UACH), was set up. First, an analysis of vehicle capacity was carried out to establish the peak hours of vehicles’ entrances and compare it to the parking lots’ capacity. For one working week (6 days), it was determined that Tuesdays have the highest vehicle occupancy, and Saturdays are the days with the least traffic. Second, the geometric design of the parking lot (divided into two areas because of the terrain topography: upper and bottom levels), its dimensions and location of parking spots and marks on the pavement for traffic directions, were obtained from its blueprint, to visualize how the surveillance cameras can be oriented to cover the area. A detection system prototype was created for a specific area of the parking lot, using an artificial vision technique to perform the video extraction, while the digital image processing was developed in MATLAB. To complement and achieve the objective, Object- Oriented Programming (OOP) was used to obtain the count analysis as well as the availability/occupancy of each of the parking areas. This information is shown on a web page, with a simple driver-friendly design, since

关键词： geometric design Machine Vision Digital Processing OOP Web Page

Extended T-mesh and Data Structure for the Easy Computation of T-spline

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Extended T-mesh and Data Structure for the Easy Computation ...

绕一个角点的Bézier三角片C1连续拼接

第五届全国几何设计与计算学术会议

作者：蔺宏伟蔡烨高曙明 State Key Lab.of CAD&CG Zhejiang University

T-spline overcomes the topological constraints of the control net of NURBS model ***,the introduction of T-junctions,L-junctions and the isolated vertices in the T-mesh makes its topological structure very *** a result,not only the T-mesh is hard to be represented,but the computation and local refinement of T-spline are difficult to be implemented as well. This hinders the studies and applications of T-splines in *** this paper,we develop the extended T-mesh,which can be represented in an obj-like format file,and converted into the face-edge-vertex data structure *** such data structure, the computation of T-splines can be made much ***,we develop a new local refinement algorithm,by virtue of the extended *** new algorithm is easy to be implemented,by separating the local refinement into two procedures,the mesh refinement,and blending function refinement.

关键词： T-splines NURBS extended T-mesh local refinement geometric design isogeometric analysis

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绕一个角点的Bézier三角片C1连续拼接