Maintenance and Management of Expressway High Slope

2021 ◽  
Keyword(s):  
High Slope

Freeway Slope Stability Evaluation Based on Multi-Level Fuzzy Neural Network

2012 ◽  
Vol 430-432 ◽  
pp. 1700-1703
Author(s):  
Yan Kai Wu ◽  
Xian Song Sang ◽  
Bin Niu
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Slope Stability ◽  
Basic Principle ◽  
Fuzzy Neural Network ◽  
Stability Assessment ◽  
High Slope ◽  
Fuzzy Neural ◽  
Multi Level ◽  
Artificial Neural

On the basis of introduced basic principle of fuzzy-artificial neural network, this article constructed a slope stability assessment index system with multi-level fuzzy neural network, and made detailed evaluation criterion according to the assessment characteristics of slope stability. Through introducing the basic principle of multi-level comprehensive assessment from fuzzy mathematics and artificial neural network theory, it overcomes the defect of difficult to be quantified in evaluation process of slope stability. Therefore, it can be better to deal with some uncertain problems occurred in the slope stability assessment process, and as much as possible to express all factors influencing slope stability really and objectively. We selected 20 single factor evaluation indexes to assess slope stability based on surveying the high slope stability in Mian county-Ningqiang county freeway section. It took "normal distribution model function" as a membership function to develop a program with the model of fuzzy neural network. Furthermore, we took 30 typical slope examples as training sample to conduct effectiveness test and feedback test for the program. After the precision requirement was met, we used the program to evaluate 21 high slope examples and compared the results with the ones solved by traditional mechanical methods. The coincidence degree by using two kinds of methods to assess the same slope stability is 76.2%.

980 nm high power, high slope efficiency distributed feedback lasers with nonabsorbing mirrors

1998 ◽  
Vol 34 (17) ◽  
pp. 1663 ◽  
Author(s):  
R.M. Lammert ◽  
J.E. Ungar ◽  
S.W. Oh ◽  
H. Qi ◽  
J.S. Chen ◽  
...  
Keyword(s):  
High Power ◽  
Slope Efficiency ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
High Slope

scholarly journals Comparison of beach profiles conducive for turtle nesting in Andaman

2018 ◽  
Vol 10 (10) ◽  
pp. 12337-12343
Author(s):  
Subramanian Narayani ◽  
Sasidharan Venu ◽  
Andrea Joan D'Silva
Keyword(s):  
Anthropogenic Activities ◽  
Slope Angle ◽  
Vegetation Patterns ◽  
Long Beach ◽  
Single Factor ◽  
High Slope ◽  
Beach Slope ◽  
Nesting Site ◽  
Nesting Sites ◽  
Study Sites

The present study was undertaken to compare beach characteristics associated with turtle nesting in the Andaman group of islands.  Karmatang, Kalipur, Ramnagar, Chidiyatapu, Carbyn’s Cove, and Wandoor were chosen as study sites.  Beach slope, sand grain characteristics, and general vegetation patterns were analysed.  The angle of inclination of the beach slope ranged from 2.06 to 8.3 degrees.  Beaches with a higher angle had a comparatively higher number of nesting sites.  The study shows that a single factor does not make a beach more conducive for nesting.  Chidiyatapu has the widest beach but lacks other features and so it is not a preferred nesting site.  The grain size of sand in Wandoor is highly favourable, but the intertidal region is not long and there are streams that can drown the nests.  Karmatang has a long beach and a higher slope angle.  Ramnagar has a moderate beach length and a high slope angle.  The dominant grains at both the beaches were found to be granules.  The absence of streams and artificial light, fewer number of anthropogenic activities, lack of obstacles, the presence of bordering vegetation, and a conducive beach slope with granular sand grains make Ramnagar, Karmatang, and Kalipur ideal for turtle nesting.

Riesgos socioambientales derivados de la pérdida de servicios ecosistémicos: el caso de Ecatepec de Morelos, Estado de México

2021 ◽  
pp. 32-53
Author(s):  
Omar Rojas García
Keyword(s):  
Quality Of Life ◽  
Urban Growth ◽  
Complex Variables ◽  
Medium Term ◽  
Conservation Areas ◽  
High Slope ◽  
Analysis Methodology ◽  
Ecological Conservation ◽  
Environmental Risk Analysis

This paper was originated in an investigation carried out in the Municipality of Ecatepec de Morelos in the period from October 2019 to March 2020, and which served as support for the update of the Municipal Urban Development Plan 2020 for the same municipality. The purpose is to recognize the socio-environmental factors that drive the construction of human settlements in ecological conservation areas and that, in the medium term, alter the surrounding ecosystems and increase their vulnerability to geological and hydrometeorological phenomena. Through an environmental risk analysis methodology, the socio-environmental impacts generated by irregular settlements on ecological conservation areas are analyzed, as the houses are located in areas of high slope, it makes them more vulnerable to the phenomena mencioned. Even these areas are accessible to certain sectors of the population, in terms of rent or purchase of housing, such practices are usually illegal, and bring with them the deterioration of the existing natural vegetation, in addition to the loss of ecosystem services derived from the unplanned urban growth. These invasions correspond to a permanent process that includes complex variables, such as the deterioration of the quality of life, economic insufficiency to satisfy needs and in a synergistic way, generates social problems such as insecurity and violence.

scholarly journals Three-Dimensional Stopping Sight Distance Calculation Method under High Slope Restraint

2020 ◽  
Vol 10 (20) ◽  
pp. 7118
Author(s):  
Yonghong Yang ◽  
Jiecong Wang ◽  
Yuanbo Xia ◽  
Lan Huang
Keyword(s):  
Calculation Method ◽  
Three Dimensional ◽  
Highway Safety ◽  
Small Radius ◽  
Safety Engineering ◽  
Design Data ◽  
Important Indicator ◽  
High Slope ◽  
Sight Distance ◽  
Stopping Sight Distance

Sight distance is an important indicator to ensure the safety of drivers, and is also an indispensable evaluation basis in highway safety engineering. In mountainous highways, high slopes and small radius often lead to poor visibility and traffic accidents. Through the combined calculation of horizontal and vertical sections, this paper comprehensively considers the specific sizes of roadside clearance, high slope, as well as the position and height of the driver’s view point and other factors, and it analyzes the limited visibility of the driver in the process of driving right turn. An effective and simplified calculation method based on design data for three dimensional (3D) stopping sight distance (S.S.D.) in high fill sections is proposed. Finally, the S.S.D. inspection of the actual highway, based on design speed and operating speed, is carried out, and the sight distance of the calculated point is judged by comparing the value with the normal value and the calculation result of the horizontal sightline offset. The results show that the method proposed in this paper is consistent with the sight distance results obtained by the horizontal sightline offset method, which indicates the calculation method is accurate and provides a technical reference for S.S.D. evaluation in highway safety engineering.

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