scholarly journals Development of calculated and normative framework in the field of maximum runoff of rain and spring flood: problems and possible solutions

2017 ◽  
pp. 164-170
Author(s):  
E.D. Gopchenko ◽  
M.E. Romanchuk ◽  
V.A. Ovcharuk
Keyword(s):  
Geometric Model ◽  
Hydrological Regime ◽  
Regulatory Document ◽  
Spring Flood ◽  
Probability Of Exceedance ◽  
Normative Framework ◽  
Direct Observations ◽  
Design Characteristics ◽  
Definition Of ◽  
Maximum Runoff

The article deals with the problematic issues  related to the definition of the design characteristics of the maximum runoff of rain and spring floods the  rare  probability of exceedance in the case absence of direct observations for hydrological regime of rivers. A brief review of foreign and domestic methods to determine the maximum runoff of the rivers is discussed. A new calculated and normative framework based on the theory of channel isochronous with using geometric model of  slope and streamflow hydrographs are proposed. The formulas proposed  by the authors is recommended for practical use, as a supplement to a new regulatory document, which is being developed in Ukraine.

Картофелекопатель с ротационной сепарирующей поверхностью

2018 ◽  
Author(s):  
V.M. Alakin ◽  
G.S. Nikitin
Keyword(s):  
Performance Data ◽  
Pilot Studies ◽  
Research Results ◽  
Operating Modes ◽  
Analysis Of Results ◽  
Design Characteristics ◽  
And Performance ◽  
Definition Of

Приведены результаты исследований экспериментального картофелекопателя с ротационной сепарирующей поверхностью. Особое внимание уделяется обоснованию конструктивных параметров и определению рабочих характеристик нового сепарирующего устройства. На основе анализа результатов экспериментальных исследований определены наиболее оптимальные режимы работы экспериментального картофелекопателя.Research results of an experimental potato digger with rotational separating web are published in this article. Special attention is paid to definition of design characteristics and performance data of the new separating device. Admissible operating modes are defined on the basis of the analysis of results of pilot studies of the experimental potato digger.

scholarly journals Features of the Spring Flood Formation in the Arpa River Basin

2021 ◽  
pp. 126-152
Author(s):  
Keyword(s):  
River Basin ◽  
Weighted Average ◽  
Close Correlation ◽  
Annual Runoff ◽  
Average Height ◽  
Spring Flood ◽  
Correlation Relationship ◽  
Catchment Areas ◽  
The Mean ◽  
Maximum Runoff

The article considers main physical and geographical factors affecting the runoff, spring flood of rivers in the Arpa River basin, and analyzes the regularities of their spacetime distribution. The authors have obtained correlation relationship between the values of the flood runoff layer, the mean module maximum runoff and weighted average height of the catchment area of the Arpa River, between the mean annual maximum runoff module for the period floods and catchment areas of rivers. These dependencies can be used for preliminary estimates of the spring flood runoff of unexplored rivers of the territory under consideration. A close correlation between the values of the annual runoff and the runoff of the spring flood in the section of the Arpa River – Dzhermuk has been also revealed. It can be used for forecasting the annual flow.

Trust Management in Mobile Ad Hoc Networks for QoS Enhancing

2016 ◽  
pp. 632-659
Author(s):  
Ryma Abassi
Keyword(s):  
Mobile Ad Hoc Networks ◽  
Trust Management ◽  
Ad Hoc ◽  
Reliability Evaluation ◽  
Unified Framework ◽  
Collusion Attack ◽  
Direct Observations ◽  
Collaborative Environment ◽  
Hoc Networks ◽  
Definition Of

In a collaborative environment such as MANET, nodes reliability evaluation is vital. Trust Management can be used to ensure such healthy collaboration it offers a formal and unified framework for trust specification and interpretation. Establishing trustworthy relationships is generally done by maintaining a reputation for each node computed based on direct observations or neighbors' observations exchanged using recommendations. Unfortunately, for malicious reason, such method may be faked by cheaters: several nodes collude in order to rate each other with the maximum value and decrease other nodes' reputations by giving negative recommendations. The main contribution of this chapter is then, the proposition of a trust based environment for MANET and securing it against collusion attack in order to enhance the network QoS. This is achieved using three steps: (1) the definition of a formal trust based environment (2) the addition of a process handling collusion attack and (3) the extension of the whole proposition by a delegation process allowing nodes functionalities sharing.

scholarly journals Deterministic mathematical morphology for CAD/CAM

2014 ◽  
Vol 31 (7) ◽  
pp. 1221-1241 ◽  
Author(s):  
Rubén Sarabia-Pérez ◽  
Antonio Jimeno-Morenilla ◽  
Rafael Molina-Carmona
Keyword(s):  
Mathematical Morphology ◽  
Geometric Model ◽  
Three Dimensional ◽  
Morphological Operations ◽  
Basic Operation ◽  
Geometric Data Structures ◽  
Content Type ◽  
Morphological Operators ◽  
Cad Cam ◽  
Definition Of

Purpose – The purpose of this paper is to present a new geometric model based on the mathematical morphology paradigm, specialized to provide determinism to the classic morphological operations. The determinism is needed to model dynamic processes that require an order of application, as is the case for designing and manufacturing objects in CAD/CAM environments. Design/methodology/approach – The basic trajectory-based operation is the basis of the proposed morphological specialization. This operation allows the definition of morphological operators that obtain sequentially ordered sets of points from the boundary of the target objects, inexistent determinism in the classical morphological paradigm. From this basic operation, the complete set of morphological operators is redefined, incorporating the concept of boundary and determinism: trajectory-based erosion and dilation, and other morphological filtering operations. Findings – This new morphological framework allows the definition of complex three-dimensional objects, providing arithmetical support to generating machining trajectories, one of the most complex problems currently occurring in CAD/CAM. Originality/value – The model proposes the integration of the processes of design and manufacture, so that it avoids the problems of accuracy and integrity that present other classic geometric models that divide these processes in two phases. Furthermore, the morphological operative is based on points sets, so the geometric data structures and the operations are intrinsically simple and efficient. Another important value that no excessive computational resources are needed, because only the points in the boundary are processed.

Factors influencing children’s use of urban green spaces

2017 ◽  
Vol 28 (4) ◽  
pp. 520-532 ◽  
Author(s):  
Isil Kaymaz ◽  
Dicle Oguz ◽  
Ozlem Candan Cengiz-Hergul
Keyword(s):  
Green Space ◽  
Principal Component ◽  
Positive Association ◽  
Holistic Approach ◽  
Green Spaces ◽  
Urban Green Spaces ◽  
Direct Observations ◽  
Design Characteristics ◽  
Questionnaire Surveys ◽  
Surveys And Questionnaire

The purpose of this study was to investigate patterns and factors related to 6- to 12-year-old children’s and their parents’ green space use behaviours in Çayyolu neighbourhood of Ankara, Turkey. Data were collected through draw and write surveys and questionnaire surveys at selected schools, and direct observations in eight parks in the neighbourhood. A total of 418 children and 383 of their parents participated in the surveys. In all, 498 recordings were made during on-site observations. Findings suggest that there is an interaction between park visiting patterns of parents and their children. Taking children to parks was a major motivation for – particularly female (p < 0.05) – parents to go outdoors. Most children (75%) used only gardens of their houses or housing complexes. There was a positive association between parents’ and children’s duration of visit (p = 0.00). Principal component analysis revealed three factors (52% of the total variance) effecting parents’ influence on their children’s use of green spaces; benefits of spending time outdoors, safety concerns and design characteristics. Results indicate that environmental design is not solely a factor in use of green spaces; understanding and promoting children’s use of green spaces should involve a holistic approach that includes social, cultural and physical aspects of the environment.

Exploration of Cost Control Problems in the Customized Production Process of Mechanical Products

2013 ◽  
Vol 443 ◽  
pp. 726-729
Author(s):  
Long He ◽  
Jing Fang Wang
Keyword(s):  
Production Process ◽  
Low Cost ◽  
Geometric Model ◽  
Optimal Method ◽  
Different Types ◽  
Mechanical Products ◽  
Customized Production ◽  
Definition Of ◽  
Machinery Manufacturing ◽  
Different Levels

This paper gives the definition of configuration rules in the customized production process of mechanical products from two different levels: the activities and parts. In this configuration, different customized production process of customized products will be generated to achieve the purpose of reusing different types of resources; finally, practical example will be given to prove this verification. Customized production is interactive and highly imitative. According to theses two advantages, this paper adopts computer technology to establish geometric model of production figures. In this way, this application can not only simultaneously meet the needs of both machinery manufacturing production and customized production, but also launch various simulation, verification, and contrast and optimization process to a variety of program. Finally, an optimal method for production is used eventually to realize the purpose of low-cost and high quality.

scholarly journals Performance Analysis of Induction Motor using Ansys

2020 ◽  
Vol 9 (4) ◽  
pp. 2002-2007
Keyword(s):  
Induction Motor ◽  
Power Efficiency ◽  
Geometric Model ◽  
Squirrel Cage ◽  
Squirrel Cage Induction Motor ◽  
Variable Frequency Drives ◽  
Actual Load ◽  
Design Characteristics ◽  
Cage Induction Motor ◽  
Overload Capacity

Squirrel cage Induction motors are useful in constant speed and variable frequency drives applications because they are self starting and have high overload capacity. Though they are self starting, their design limits corresponding to torque should be large to meet the actual load conditions. To get optimum performance of motor, it needs unique design characteristics. Design of machines is a time consuming process. Proper methods are required for designing. ANSYS software is being used in recent times for designing electrical machines. In this paper, RMxprt tool box is used to design induction motor and its performance is analyzed using ANSYS Maxwell. In RMxprt, the induction motor's geometric model is designed and analyzed .In this model the machine rating is of 1100W with a rated speed of 1450 rpm and with rated voltage of 330V. With the help of this design, squirrel cage induction motor performance in terms of torque, power, efficiency, voltage and current can be analyzed for any rating.

scholarly journals The Impact of Rolling Stock Heterogeneity on Tram Stop Dwell Time

2021 ◽  
Vol 12 (1) ◽  
pp. 84
Author(s):  
Igor Majstorović ◽  
Maja Ahac ◽  
Saša Ahac ◽  
Silvio Bašić
Keyword(s):  
Dwell Time ◽  
Travel Speed ◽  
Influential Factors ◽  
Rolling Stock ◽  
Closing Time ◽  
Door Opening ◽  
Design Characteristics ◽  
Definition Of ◽  
The Impact ◽  
The City

The prediction of stop dwell time is a major issue in travel speed modeling, i.e., in the definition of travel time for high-frequency and high-ridership rail public transport. This is due to the numerous influential factors associated with stop dwell time, variable both in space and time, such as passenger flow, vehicle and stop design characteristics, and traffic organization. To investigate the impact of the heterogeneity of tram vehicles on stop dwell time, a survey was conducted regarding the tram network of the City of Zagreb. The dwell time at three consecutive island stops served by three different tram vehicle types was analyzed. The stops are located near the city center, in a separate tram corridor, at the far side of signalized intersections. Dwell time was determined and evaluated through the statistical analysis of observed, measured, and video-recorded data. The results show that at stops with up to 200 passengers per hour, the dwell time is around 15 s. For volumes of 20 passengers or less per tram, the dwell time is mostly affected by the tram door opening mechanism and opening/closing time. As the passenger volumes become higher, the number of doors per vehicle becomes more significant.

Finding the Shape of a Flexible Blade for Free-Form Layered Manufacturing of Plastic Foam Objects

1998 ◽  
Author(s):  
Imre Horváth ◽  
Joris S. M. Vergeest ◽  
Imre Juhász
Keyword(s):  
Order Approximation ◽  
Geometric Model ◽  
Cost Effective ◽  
Soft Materials ◽  
Layered Manufacturing ◽  
Physical Models ◽  
Free Form ◽  
Plastic Foams ◽  
Physically Based ◽  
Definition Of

Abstract The need for rapid, cost-effective and finish-less manufacturing of large sized, sculptured, physical models from various soft materials is increasing in several fields. For objects fabricated from plastic foams an advantageous approach is free-form, thick-layered manufacturing. Although it is technologically demanding, to achieve the best results (a) computer definition of the geometry has to be accurate, (b) the geometric model has to be directly sliced, (c) higher order approximation of the nominal shape is necessary, and (d) a quasi-free-form working out of the front surfaces of the layers is needed. The authors have developed the mathematical and/or technological fundamentals and process of free-form cutting based on heated flexible blades. The shape and the relative positions of the flexible blade are controlled continually as needed by the normal curvatures of the front faces of the layers. The paper elaborates on the computation methods for physically-based and geometrically-based modeling of flexible blades. The algorithms for approximating curve generation and curve matching are also presented. The paper extends to some of the most important aspects of the global thick-layered fabrication process.

Automated FE Analysis for Heat Sink of LED Modules

2013 ◽  
Vol 302 ◽  
pp. 765-771 ◽  
Author(s):  
Joon Seong Lee ◽  
Dong Keun Park ◽  
Youn Jong Choi
Keyword(s):  
Heat Sink ◽  
Geometric Model ◽  
Three Dimensional ◽  
Fe Analysis ◽  
Present System ◽  
Analysis Model ◽  
Solid Geometry ◽  
Analysis System ◽  
Definition Of ◽  
Interactive Operations

This paper describes an automatic finite element (FE) mesh generation for FE analysis of LED modules. It is consisting of element generation, bubble packing and solid geometry modeler. This automated FE analysis system including bubble packing method consists of three sub-processes: (a) definition of geometric model, i.e. analysis model, (b) generation of bubbles, and (c) generation of elements. One of commercial solid modelers is employed for three-dimensional solid structures. Bubble is generated if its distance from existing bubble points is similar to the bubble spacing function at the point. The Delaunay method is introduced as a basic tool for element generation. The developed system allows designers to evaluate detailed physical behaviors of structures through some simple interactive operations to their geometry models. To demonstrate practical performances of the present system, the system was used to an analysis of heat sink. Practical performances of the present system are demonstrated through several examples for heat sink of LED modules.

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