MONITORING TECHNICAL CONDITIONS OF ENGINEERING STRUCTURES USING THE TERRESTRIAL LASER SCANNING TECHNOLOGY

2013 ◽  
Vol 95 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Janina Zaczek-Peplinska ◽  
Mariusz Pasik ◽  
Artur Adamek ◽  
Anna Adamek ◽  
Maria Kołakowska ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Continuous Distribution ◽  
Building Structures ◽  
Huge Amount ◽  
Engineering Structures ◽  
Engineering Construction ◽  
Additional Information ◽  
Short Time ◽  
The Given

Abstract The laser scanning technology offers quite new possibilities in the field of the existing monitoring of engineering structures. The basic advantage of the laser scanning technology is huge amount of measuring observations and practically complete geometric and spectral information about the measured structures, which may be required within the short time. In the context of detection of threatens related to deformations and displacements of building structures, the surface - quasi-continuous distribution of measuring points is one of the most important factors. which ensure the possibility to perform correct evaluation of safety conditions of investigated structures. The proposed technological solution offers a series of new possibilities and the resulting methodology of determination of deformations and displacements of various structures, will considerably increase the scope of possible works and analyses. This will also create the new segment of data, which will result in delivery of additional information concerning conditions of the structure to experts from various fields, such as, among others, civil engineering, construction or geotechnique, who monitor the given structure.

scholarly journals Mechanical properties of lightweight concrete with sintered aggregate

2020 ◽  
Vol 323 ◽  
pp. 01005
Author(s):  
Anna M. Rogowska ◽  
Paweł M. Lewiński
Keyword(s):  
Tensile Strength ◽  
Power Plants ◽  
Lightweight Concrete ◽  
Building Structures ◽  
Engineering Structures ◽  
Concrete Shrinkage ◽  
Axial Tensile ◽  
Cylinder Strength ◽  
Complex Engineering

The objective of this paper is the determination of short-term properties of lightweight concrete with sintered aggregate. The aggregate material comes from the recycling of ashes from power plants, which yield granules after processing. The research was planned based on two concrete mixes. A series of tests was carried out in the ITB Laboratory of Building Structures, Geotechnics and Concrete. As a result of these tests, the following parameters were determined: secant modulus of elasticity and cylinder strength of concrete, cube strength of concrete, axial tensile strength, splitting tensile strength, flexural strength and concrete shrinkage. Knowledge of the tested parameters is necessary when designing prestressed structures, as well as accepting proven values for static calculations when designing complex engineering structures, including prestressed elements made of lightweight concrete.

scholarly journals Displacement and deformation study of engineering structures with the use of modern laser technologies

2020 ◽  
Vol 12 (1) ◽  
pp. 354-362
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Karol Derejczyk ◽  
Michał Przytuła
Keyword(s):  
Laser Scanning ◽  
Control Point ◽  
Point Clouds ◽  
Structural Components ◽  
Engineering Structures ◽  
Time Consumption ◽  
Laser Technologies ◽  
Analysis Of Results ◽  
Reduced Time

AbstractModern measuring technologies give the means to perform tasks previously impossible with conventional methods. Their main advantages include reduced time consumption and higher measurement precision. Contemporary displacement and deformation studies of engineering structures often involve application of laser technologies, which are characterised by high precision of measurements. This article presents an analysis of results obtained from measurements of changes in the geometry of an engineering structure in which two complementary measuring technologies were used, i.e. tachymetric measurement with a Leica TDRA6000 laser station and laser scanning with a 3D FARO Focus S150 scanner. The utilised laser station enabled determination of 3D displacements in the local control point network installed on the studied structure as well as transfer of point clouds obtained from laser scans into a uniform coordinate system. The hybrid technology employed and the measurement method used ensured that the accuracy of the determined displacements and deformations of the structural components of the structure was high. The described measurement and result processing technology makes it possible to comprehensively analyse the geometric performance of structures, which consequently leads to the development of more complete conclusions concerning prevention of adverse effects of displacements and deformations in engineering structures.

scholarly journals CATHETER-DIRECTED THROMBOLYSIS AS A METHOD OF CHOICE IN THE TREATMENT OF ACUTE THROMBOSIS OF DEEP VEINS OF THE LOWER EXTREMITIES

2021 ◽  
pp. 10-13
Author(s):  
I. A. Taraban ◽  
D. V. Oklei ◽  
V. О. Prasol ◽  
S. O. Beresnyev ◽  
N. I. Dmuhovskyi
Keyword(s):  
Lower Extremities ◽  
Complete Elimination ◽  
Treatment Results ◽  
Acute Thrombosis ◽  
Catheter Directed Thrombolysis ◽  
Short Time ◽  
The Given ◽  
Methods Of Treatment ◽  
Catheter Thrombolysis

Summary. Introduction. Acute thrombosis of deep veins (DVT) of the lower extremities is a pathology that requires immediate treatment, but most thrombolytics do not work effectively, except for catheter-directed thrombolysis. Research aim. Rationalization of DVT treatment, determination of the catheter thrombolysis method as the most effective way to eliminate proximal thrombosis of deep veins. The analysis was based on the results of the treatment by different thrombolytic drugs the patients with the given pathology. Results and discussion. According to the analysis the most effective method of DVT treatment is catheter-guided administration of streptokinase, because streptokinase is the most effective anticoagulant, and its local action on the mass of the thrombus allows for complete elimination of the thrombus in a relatively short time without the counter allergic reaction to the infusion of streptokinase. Conclusions. Catheter-directed infusion of streptokinase as a method of treatment of acute thrombosis of the lower extremities has significantly better treatment results compared to other methods of treatment of this pathology.

The Influence of Age and Temperature on the Bond Behaviour between Prestressing Strands and UHPC

2015 ◽  
Vol 1106 ◽  
pp. 25-28
Author(s):  
David Čítek ◽  
Tomáš Mandlík ◽  
Jiří Kolísko ◽  
Jan L. Vítek ◽  
Stanislav Řeháček
Keyword(s):  
Structural Engineering ◽  
Engineering Structures ◽  
Modern Material ◽  
Bond Behaviour ◽  
Ordinary Concrete ◽  
Prestressing Strands ◽  
Number Of Cycles ◽  
Precast Elements ◽  
Short Time

Applications of precast elements made of UHPC have been increasing in recent years. Also in the Czech Republic, UHPC can be found as a structural material in first applications in both, buildings and transport structural engineering. Structures made from this modern material required experimental programs verification of material properties and also for determination of behaviour of structural elements. In previous research of the bond of UHPC and various types of reinforcement was proven to be very good, which makes it possible to reduce radically anchorage lengths. This paper deals in more detail with determination of the bond of prestressing strands and UHPC, during the first week after casting, in particular. For prestressing of precast elements, there are very important short-time strengths and short-time bond is showing to be a decisive factor for optimum prestressing time. Second part of the paper is focused on impact of thermal stress on bond of prestressing strands and UHPC. Samples were subjected to the cycling heat/frost and effect of a number of cycles on final bond behaviour of both UHPC and ordinary concrete were investigated. The article describes differences between ordinary concrete and UHPC.

scholarly journals FAST AND ADAPTIVE SURFACE RECONSTRUCTION FROM MOBILE LASER SCANNING DATA OF URBAN AREAS

2015 ◽  
Vol II-3/W4 ◽  
pp. 41-46 ◽  
Author(s):  
M. Gordon ◽  
M. Hebel ◽  
M. Arens
Keyword(s):  
Urban Areas ◽  
Laser Scanning ◽  
3D Model ◽  
Test Site ◽  
Huge Amount ◽  
Surface Patches ◽  
Laser Scanners ◽  
Fine Structures ◽  
Data Acquisition And Processing ◽  
Short Time

The availability of 3D environment models enables many applications such as visualization, planning or simulation. With the use of current mobile laser scanners it is possible to map large areas in relatively short time. One of the emerging problems is to handle the resulting huge amount of data. We present a fast and adaptive approach to represent connected 3D points by surface patches while keeping fine structures untouched. Our approach results in a reasonable reduction of the data and, on the other hand, it preserves details of the captured scene. At all times during data acquisition and processing, the 3D points are organized in an octree with adaptive cell size for fast handling of the data. Cells of the octree are filled with points and split into subcells, if the points do not lie on one plane or are not evenly distributed on the plane. In order to generate a polygon model, each octree cell and its corresponding plane are intersected. As a main result, our approach allows the online generation of an expandable 3D model of controllable granularity. Experiments have been carried out using a sensor vehicle with two laser scanners at an urban test site. The results of the experiments show that the demanded compromise between data reduction and preservation of details can be reached.

scholarly journals Focused crawling from the basic approach to context aware notification architecture

2019 ◽  
Vol 13 (2) ◽  
pp. 492
Author(s):  
Venugopal Boppana ◽  
Sandhya P
Keyword(s):  
Context Aware ◽  
Huge Amount ◽  
Focused Crawling ◽  
Web Documents ◽  
Cpu Time ◽  
Related Information ◽  
Wide Range ◽  
Short Time ◽  
Focused Crawlers ◽  
The Given

<p><span lang="EN-IN">The large and wide range of information has become a tough time for crawlers and search engines to extract related information. This paper discusses about focused crawlers also called as topic specific crawler and variations of focused crawlers leading to distributed architecture, i.e., context aware notification architecture. To get the relevant pages from a huge amount of information available in the internet we use the focused crawler. This can bring out the relevant pages for the given topic with less number of searches in a short time. Here the input to the focused crawler is a topic specified using exemplary documents, but not using the keywords. Focused crawlers avoid the searching of all the web documents instead it searches over the links that are relevant to the crawler boundary. The Focused crawling mechanism helps us to save CPU time to large extent to keep the crawl up-to-date.</span></p>

scholarly journals PECULIARITIES OF PRELIMINARY MOBILE LASER SCANNING DATA PROCESSING

2019 ◽  
Vol 1 (1) ◽  
pp. 239-248
Author(s):  
Maxim Altyntsev ◽  
Karkokli Hamid Majid Saber
Keyword(s):  
Data Processing ◽  
Point Cloud ◽  
Laser Scanning ◽  
Processing Technique ◽  
Digital Cameras ◽  
Data Filtering ◽  
Huge Amount ◽  
Processing Order ◽  
Data Processing Technique

The goal of preliminary mobile laser scanning (MLS) data processing is generating a unified point cloud in a required coordinate system. During this processing calibration of 2D scanners and digital cameras, point cloud adjustment, data filtering such as removal of noise and remirror points. Currently huge amount of software is developed for solving these tasks, but a degree of their auto-mation differs. Depending on software, type of scanned area preliminary MLS data processing technique can differ. The analysis of carried out scanning results with the task of revealing their pe-culiarities, determination of the preliminary data processing order and deciding about necessity to accept additional manual procedures.

The Role and Place of Budget Procedure in the System

2003 ◽  
pp. 42-49 ◽  
Author(s):  
E. Bushmin
Keyword(s):  
Budget Process ◽  
Public Expenditures ◽  
Principal Role ◽  
Process Trends ◽  
The Given ◽  
Rules Of The Game

The article is devoted to the analysis of improving budget process trends. The author offers the concept of "financial technologism". Its usage should promote an essential improvement of the budget process. The given concept is based on the fact that the regulation of budget procedure is the process of determination of "rules of the game", and the order of interaction of different institutions within the framework of the budget process, and the trends and volumes of expenses are the strategy of institutions. The procedure within the budget process plays a principal role as compared with the trends and volumes of public expenditures.

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.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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