scholarly journals Quality of surface geostatistical parameter reproduction for laser profilometers

2021 ◽  
Vol 906 (1) ◽  
pp. 012054
Author(s):  
Irina Galchenko ◽  
Janusz Kozubal ◽  
Zbigniew Muszyński ◽  
Rasaq Lawal ◽  
Marek Wyjadlowski ◽  
...  
Keyword(s):  
Laser Scanner ◽  
Building Structures ◽  
Strength Parameters ◽  
Semivariogram Model ◽  
Depth Measurement ◽  
Surface Test ◽  
Laser Devices ◽  
Contact Tasks

Abstract The description of the surface topography of building structures is important for contact tasks, bond strength and rheological processes monitoring. The determination of surface parameters is carried out using increasingly sophisticated methods and techniques, such as laser profilometer, laser scanner, confocal microscope or short range photogrammetry. The research is aimed at evaluating the mobile surface test device for quality control and failure prevention, also the authors have addressed the possibility of using inexpensive profile measuring laser equipment to obtain a geostatistical description of the surface parametrics. It is the support of creation of new measurement apparatus that is the impetus for this work for the selection of optimal laser device. It is possible to deduce from the paper how the density of measurements taken and the accuracy of height estimation in the profile affect the parameters of the semivariogram model. With the proper choice of device it is easier correctly estimate the strength parameters of the joint of concrete or soil-concrete structures. The relevance of the correctly performed measurement is proved by the link between the strength parameters of the contact surfaces and its geostatistical description. In order to assess the quality of the mapping, a spherical theoretical model with a corresponding generated surface was used as a reference. The measuring laser devices with various mapping accuracy and depth measurement precision were tested, also for description fractal dimension of results. The measurement accuracy of the depth parameter has the greatest influence for determination of the remaining parameters of the surface roughness.

scholarly journals Parameters for simulation of the thermal state and fire-resistant quality of hollow-core floors used in the mining industry

2019 ◽  
Vol 123 ◽  
pp. 01022 ◽  
Author(s):  
Andrіі Kovalov ◽  
Volodymyr Konoval ◽  
Anastasiia Khmyrova ◽  
Kateryna Dudko
Keyword(s):  
Fire Resistance ◽  
Thermal State ◽  
Mining Industry ◽  
Literary Analysis ◽  
Building Structures ◽  
Hollow Core ◽  
Industrial Construction ◽  
Software Complex

The statistical data of the fire and technogenic safety in Ukrainian mines have been studied. A literary analysis has been made of advanced expertise in determining the fire resistance of building structures. It has been studied the thermal state and fire resistance of hollow-core floors using the fire tests and the calculated determination of the fire resistance degree of a structure based on a two-dimensional model of thermal conductivity and convective heat transfer implemented in the ANSYS R17.1 software complex. The fire test of hollow-core floor has been analysed and the use of a computational-experimental method is proposed to determine the parameters when simulating the thermal state and the fire resistance of both protected and unprotected hollow-core floors. A technique has been developed for simulating the thermal state and the fire resistance of hollow-core floors, which can be used in assessment of the fire resistance degree of reinforced concrete building structures both in industrial construction and in the mining industry.

scholarly journals Certain aspects of formation of green facades for high-rise development

2020 ◽  
pp. 77-87 ◽  
Author(s):  
Ekaterina Dorozhkina
Keyword(s):  
Building Structures ◽  
Design Concepts ◽  
High Rise ◽  
Green Architecture ◽  
The Subject ◽  
Applied Design ◽  
Technical Solutions ◽  
Vertical Greening

“Green architecture” gains more and more popularity worldwide. In many ways, this relates to the need for improving environmental quality of urban area. Often, enviromentalization is used for creating green spaces on buildings, including vertical or with significant inclination. This article is dedicated to studying the questions of the structure of greening of vertical surfaces of the buildings (green facades) for medium and high-rise buildings. The research is aimed at determination of technical characteristics of designing green facades. The subject of this article is building structures of various designation (architectural, load-bearing and enclosing) that serve for the formation of greening. The author examines their potential in the formation of objects of "green architecture". The key research method is the analysis of normative and scientific framework for the design of vertical greening. The existing experience in designing green facades is explored. The scientific novelty of this work consists in systematization of the applied design concepts and engineering solutions. As a result of the study, the two types of structures are determined: supporting and maintaining. The author reviews structural systems characteristic to each type, outlines the assortment of greenery, engineering and technical solutions for maintaining plants, as well as forming capacities of the types of design solutions of green facades.

scholarly journals Determination of coefficient A in the equation for estimating the residual resource by the age of building structures

2020 ◽  
Vol 17 (5) ◽  
pp. 82-86
Author(s):  
A. G. Chernykh ◽  
◽  
Yu. V. Pukharenko ◽  
D. I. Korolkov ◽  
V. V. Belov ◽  
...  
Keyword(s):  
Building Structures ◽  
Advantages And Disadvantages

The article considers coefficient A from the equation for estimating the residual resource of the construction facility by the age of building structures taking into account the condition of the construction object during commissioning, that is the quality of construction-installation work performed. The authors propose using two techniques for determining the coefficient A. The first technique uses the method of expert estimates. Based on it, the equations for calculating the coefficient A are derived. The second technique for estimating the coefficient A is based on the method of assessing the quality of construction and installation, proposed by A. Kh. Bayburin. In each of the proposed methods, there are advantages and disadvantages. Based on the proposed approaches, the authors have developed an algorithm for estimating coefficient A in order to eliminate or reduce the influence of the disadvantages.

scholarly journals Detecting and Measuring Internal Anomalies in Tree Trunks Using Radar Data for Layer Identification

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Xiayang Xiao ◽  
Jian Wen ◽  
Zhongliang Xiao ◽  
Weilin Li
Keyword(s):  
Ground Penetrating Radar ◽  
Measurement Method ◽  
Matched Filter ◽  
Laser Scanner ◽  
Radar Data ◽  
Summer Palace ◽  
Ground Penetrating ◽  
Wooden Structures

Radar detection has proven to be an effective, nondestructive test for the determination of the quality of wood-based materials, especially in the wooden structures of ancient buildings and trees. However, the results are usually inaccurate, and it is difficult to interpret internal anomalies due to the moisture content of wood, individual differences, and other factors. In this paper, a new measurement method is proposed based on the use of ground-penetrating radar (GPR) for abnormality localization and imaging. Firstly, the time delay of the reflected signal in the inner trees is analyzed with matched filter and Hilbert detections. Secondly, the two approaches are compared with the use of a forward model, and the Hilbert algorithm is found to be more accurate. Thirdly, a laser scanner is used to collect contour data and determine the location and characteristics of internal tree anomalies. Lastly, the proposed method is tested on ancient willows at the Summer Palace. The results show that the error in the depth and area estimates of the anomalies was within 10% and 5%, respectively. Consequently, the GPR method for locating the anomalies in trees is feasible, and a laser scanner combined with contour data can present the size of the abnormal regions within the trees.

Tingkat Pemahaman Kompetensi Guru Pada Mahasiswa Pendidikan Geografi Sebagai Calon Guru Geografi

2020 ◽  
Vol 21 (1) ◽  
pp. 102-117
Author(s):  
Novia Zalmita ◽  
Muhajirah Muhajirah ◽  
Abdul Wahab Abdi
Keyword(s):  
Prospective Teachers ◽  
Prospective Teacher ◽  
Quantitative Description ◽  
Population Data ◽  
Geography Education ◽  
Teacher Competence ◽  
Education Department ◽  
Long Time

One that influences human resource indicators is education. The teacher is a profession as a job of academic specialization in a relatively long time in college. Understanding related to teacher competence is very important to have by a prospective teacher because it can affect the quality of performance as a professional teacher. The teacher's competence is known as pedagogic, professional, social and personality competencies. The issue in this study is how the competency of the teacher of the Department of Geography Education FKIP Unsyiah as a prospective teacher of geography? The purpose of this study was to determine the competence of teachers in the Department of Geography Education FKIP Unsyiah as prospective geography teachers. Quantitative description approach is used in this study to find answers to the issue. The population in this study were students of the Department of Geography Education FKIP Unsyiah class of 2015 and 2016 who had been declared to have passed the Micro Teaching and Magang Kependidikan 3 course totaling 50 people. Because the population is small and can be reached, the determination of the sample using total sampling techniques so that the sample in this study is the whole population. Data collection is done by distributing test questions to respondents. The data was analyzed using the descriptive statistics percentage formula. The results of the study indicate that the level of teacher competence of Geography Education Department students as prospective teachers is in the moderate category, namely as many as 22 respondents (44%). A total of 12 respondents (24%) were in the high category, 15 respondents (30%) were in the low category and 1 respondent (2%) were in the very low category.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

Fluctuations of Annual Precipitation and Water Resources Quality in Ukraine

2016 ◽  
Vol 10 (4s) ◽  
pp. 621-629
Author(s):  
Valentina Pidlisnyuk ◽  
◽  
John Harrington JR ◽  
Yulia Melnyk ◽  
Yuliya Vystavna ◽  
...  
Keyword(s):  
Water Resources ◽  
Surface Waters ◽  
Precipitation Amount ◽  
Ion Concentration ◽  
Annual Precipitation ◽  
Resource Quality ◽  
Phosphate Ion ◽  
Regional Trends

The article focuses on examining the influence of fluctuations in annual precipitation amount on the quality of surface waters. Water quality was estimated with data on BOD, COD and phosphate–ion concentration within five selected regions of Ukraine. Analysis of the precipitation data (1991 – 2010) showed different regional trends. Using the statistics, determination of the interconnection between precipitation amount and water resources quality were done. The obtained regularities and associated uncertainties can be used for prediction of changes in water resource quality and as a guide for future adaptation to possible climate change.

POTENSI PENGEMBANGAN SADE SEBAGAI DESA WISATA LOMBOK

2016 ◽  
Vol 20 (2) ◽  
pp. 69-82
Author(s):  
W. Suprihatin ◽  
H. Hailuddin
Keyword(s):  
Analytical Hierarchy Process ◽  
Environmental Aspect ◽  
Priority Level ◽  
Highest Weight ◽  
Local Tradition ◽  
Tourist Village ◽  
Hierarchy Process ◽  
Initial Pattern

The background of the problems in this study is the decreasing quality of Sade hamlet amid rising tourist arrivals. From the environmental aspect, the conditions of the hamlet began to decline, in which the initial pattern of Sade has started a lot of changes towards the deficient and began to leave the local tradition. One effort to improve the condition of Sade hamlet in social, cultural and the environmental aspect is through the formulation of a sustainable structuring, the presence and identity maintaining and making a sustainable Tourism Village. Through analysis of AHP (Analytical Hierarchy Process) by collecting the perceptions of some experts through interviews and questionnaires, obtained by weighting the priority of the experts, namely the preservation of culture as an element of priority-level goals to be achieved in the development of Sade Hamlet as a tourist village at 0,476. While the determination of the level of the main criteria in the achievement of these objectives is the highest weight while maintaining a typical village environment at 0.319. Priority strategies that get the highest weight of the experts is that Sade Hamlet Revitalization with a priority weighting of 0.583. The second priority is the relocation of Hamlet at 0.235. Lowest weighting or last priority is Replication Sade Hamlet at 0.182.

Sign in / Sign up

Export Citation Format

Share Document