scholarly journals Applying innovative technologies for road surfaces monitoring

2021 ◽  
Vol 334 ◽  
pp. 01017
Author(s):  
Rustem Sakhapov ◽  
Marat Makhmutov
Keyword(s):  
Dielectric Constant ◽  
Signal Transmission ◽  
Frequency Characteristics ◽  
Repair Work ◽  
Innovative Technologies ◽  
Computer Equipment ◽  
Road Surfaces ◽  
Destructive Methods

The paper considers the advantages and nature of georadar monitoring of road surfaces comparing to traditional destructive methods of road exploration. The authors checked the thickness of the structural layers of pavement to determine appropriate repair work using the amplitude-frequency characteristics and the dielectric constant (the speed of signal transmission). The article examined the section of the highway and the examination data was recorded in a file, which allows further study and documentation of the material with the help of computer equipment.

Measurement of frequency characteristics of disturbance torque in the process of satellite antenna rotation

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1563-1569
Author(s):  
Bo Gao ◽  
Minglong Xu
Keyword(s):  
Real Time ◽  
Signal Transmission ◽  
Frequency Characteristics ◽  
Structural Vibration ◽  
Driving Mechanism ◽  
Satellite Antenna ◽  
Satellite Applications ◽  
Study Characteristics ◽  
Satellite Signal ◽  
Disturbance Torque

As an important equipment for satellite signal reception and transmission, the satellite antenna needs to be rotated in real time to achieve real-time tracking of the target and complete signal transmission during applications. Antenna driving mechanism is generally composed of motor and other components, which will cause some structural vibration during rotation. For high-stability satellite applications, the vibration disturbance torque is a major factor affecting the satellite stability. In order to study characteristics of the disturbance torque, the disturbance data from the antenna under different rotation conditions should be measured. In this paper, the frequency characteristics of disturbance torque of a rotating satellite antenna using stepper motor as driving motor is tested and discussed.

scholarly journals Effect of Fiber Weave Structure in Printed Circuit Boards on Signal Transmission Characteristics

2019 ◽  
Vol 9 (2) ◽  
pp. 353 ◽  
Author(s):  
Bei Chen ◽  
Ruohe Yao ◽  
Hongfei Wang ◽  
Kuiwei Geng ◽  
Juan Li
Keyword(s):  
Dielectric Constant ◽  
High Speed ◽  
Printed Circuit Boards ◽  
Signal Transmission ◽  
Circuit Boards ◽  
Weave Structure ◽  
Line Parallel ◽  
Fluctuation Amplitude ◽  
Impedance Fluctuation ◽  
Constant Impedance

In this paper, we characterized and compared signal transmission performances of traces with different specifications of fiber weave. Measurements demonstrated that the dielectric constant, impedance fluctuation, and differential skew were all affected by fiber weave style. For flattened fiber weaves, the dielectric constant fluctuation reached 0.18, the impedance fluctuation amplitude was 1.0 Ω, and the differential skew was 2 ps/inch. For conventional fiber weaves, the three parameters were 0.44, 2.5 Ω, and 4 ps/inch respectively. Flattened fiber weave was more favorable for high-speed signal control. We also discussed the other methods to improve the fiber weave effect. It turned out that NE-glass (new electronic glass) fiber weave also had better performance in reducing impedance fluctuation and differential skew. Furthermore, made the signal traces and fiber weave bundles with an angle or designing the long signal line parallel to the weft direction both are simple and effective methods to solve this problem.

IMPROVING THE QUALITY OF REPAIR OF NON-RIGID ROAD SURFACES WITH THE USE OF COLD ASPHALT CONCRETE MIXTURES

2021 ◽  
pp. 62-74
Author(s):  
А. Ф. Зубков ◽  
К. А. Андрианов ◽  
Б. Бехзоди
Keyword(s):  
Layer Thickness ◽  
Asphalt Concrete ◽  
High Quality ◽  
Repair Work ◽  
The Road ◽  
Concrete Mixtures ◽  
Factory Production ◽  
Air Temperatures ◽  
Road Surfaces

Постановка задачи. Необходимо рассмотреть технологию ремонта дорожных покрытий нежесткого типа с применением холодных асфальтобетонных смесей на битумах марок БНД, СГ и МГ. Требуется разработать математическую модель конструкции автомобильной дороги, позволяющую демонстрировать распределение температуры по толщине слоя покрытия в зависимости от конструктивных параметров дороги с учетом теплофизических свойств материалов и температурных условий её эксплуатации. Также надлежит уточнить влияние температуры смеси на предел прочности холодной смеси заводского производства. Следует провести ремонт выбоин покрытия в производственных условиях при пониженных температурах воздуха. Результаты. По результатам моделирования распределения температуры в слое покрытия доказано, что применение холодных асфальтобетонных смесей обеспечивает высокое качество ремонтных работ при температуре воздуха выше 30 °С. Получены данные о зависимости температуры нагрева основания от температуры воздуха и толщины слоя, которая обеспечивает температурные режимы холодной смеси при её уплотнении. Установлено, что предел прочности покрытия зависит от температуры. Максимальная величина предела прочности холодного асфальтобетона заводского производства обеспечивается при температуре уплотнения смеси 50-55 °С. Проведенный ремонт выбоин дорожного покрытия при пониженных температурах воздуха доказал возможность выполнения ремонтных работ с высоким качеством в данных производственных условиях. Выводы. Доказана эффективность нагрева основания выбоины перед укладкой холодной асфальтобетонной смеси при ремонте дорожных покрытий нежесткого типа со снижением температуры воздуха ниже 5 °С. Установлено влияние температуры основания покрытия на ее равномерное распределение в зависимости от температуры воздуха и толщины слоя покрытия при выполнении ремонтных работ. Полученные данные о зависимости предела прочности холодного асфальтобетона заводского производства от температуры воздуха позволяет определять параметры уплотняющих машин, обеспечивающих высокое качество ремонтных работ. Statement of the problem. It is essential to consider the technology of repair of road surfaces of non-rigid type using cold asphalt-concrete mixtures on bitumen grades BND, SG and MG. It is important to develop a mathematical model of the road structure that enables modeling the temperature distribution over the layer thickness, depending on the design parameters of the road considering the thermal and physical properties of materials and the temperature conditions of the road operation. It is also necessary to specify the effect of the mixture temperature on the tensile strength of the cold mixture of factory production. Potholes of the coating must be repaired at low air temperatures of different repair technologies in production conditions. Results. Based on the results of modeling the temperature distribution in the coating layer, it is proven that the use of cold asphalt-concrete mixtures ensures high quality of repair work at air temperatures above +30 ° C. The dependence of the heating temperature of the base on the air temperature and the layer thickness is obtained, which provides the temperature conditions of the cold mixture during compaction. It is established that the ultimate strength depends on temperature. The maximum value of the strength limit of cold asphalt concrete of factory production is provided at the compaction temperature of the mixture at +50-55⁰C. The repair of potholes of the road surface carried out in production conditions at low air temperatures proved the ability to perform repair work with high quality of work. Conclusions. It is proven that it is effective to heat the base of the pothole during repair on non-rigid road surfaces at low air temperatures before laying a cold asphalt-concrete mixture. The influence of the base temperature on its distribution over the layer thickness depending on the air temperature and the layer thickness during repair work is established. The obtained dependence of the strength limit of cold asphalt concrete of factory production on temperature allows us to determine the parameters of compacting machines that ensure high quality of repair work.

Effects of Polymer Material Variations On High Frequency Dielectric Properties

2009 ◽  
Vol 1156 ◽  
Author(s):  
Gregory Pawlikowski
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
High Frequency ◽  
Dielectric Material ◽  
Signal Transmission ◽  
Polymer Materials ◽  
Combined Effects ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Environmental Processes

AbstractIn high frequency signal packaging, the plastic dielectric material takes on an increasingly important role in the performance of the signal transmission. Variations within the plastic can occur as a result of a number of manufacturing and environmental processes. These variations can be sufficient to change the dielectric properties. The extent of change to the dielectric properties of polymer materials as a result of controlled variations to major filler additives, moisture and temperature has been investigated. The combined effects of moisture and temperature can cause changes to the dielectric constant of certain materials by more than 30 %.

scholarly journals Performance of performance specifications in design-build highway projects

2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Jan Bröchner ◽  
Johan Silfwerbrand
Keyword(s):  
Project Managers ◽  
Highway Projects ◽  
Innovative Technologies ◽  
Performance Requirements ◽  
Road Surfaces ◽  
Design Build ◽  
Innovative Solutions ◽  
Performance Specifications ◽  
Technical Specifications ◽  
Innovation Rate

Design-build contracts with performance-based specifications are believed to raise productivity and the innovation rate. Such specifications for highway and bridge contracts may create risks, be too detailed or difficult to verify. The purpose has been to analyse how performance-based requirements are used in Swedish design-build contracts for highway projects. How contractors are encouraged to provide innovative technologies is emphasized. Generic documents from the Swedish Transport Administration for design-build contracts have been studied, and case studies of six design-build contracts with performance-based requirements have been made. Technical specifications for these contracts have been analysed and interviews held with both client and contractor project managers. Results include that it is along the time axis that major obstacles to innovation arise. Before the contractor is able to develop innovative solutions, the initial design plan restricts the highway geometry. During construction, a mix of performance and prescriptive requirement formulations is more of a challenge than clashes between performance requirements. The client may avoid performance language, more so for bridges than road surfaces, because of concerns with efficient maintenance in the future. It is recommended that performance-based specifications should be less detailed and that a life cycle view of highway projects should support innovative technologies.

scholarly journals The Influence of Transport Load on Quality of Repair Works of Non-Rigid Pavements with Application by a Jet-Injection Method

2019 ◽  
pp. 115-121
Author(s):  
Mikhail E. Piletsky ◽  
Anatoly F. Zubkov ◽  
Konstantin A. Andrianov ◽  
Marianna A. Porozhenko
Keyword(s):  
Service Life ◽  
Road Surface ◽  
Traffic Intensity ◽  
Jet Injection ◽  
Repair Work ◽  
Injection Method ◽  
The Road ◽  
Road Surfaces ◽  
Mineral Mixture

Increased traffic intensity and increased axial Load from vehicles on road surfaces contribute to the formation of defects in the form of potholes and cracks. To improve the service Life and traffic safety timely care of the coating is required. Untimely work Leads to a decrease in the service Life of the pavement. The use of a jet-injection method of repair of road surfaces aLLows to perform work quickLy with minimaL cost in reLation to other methods of repair. The articLe considers the process of eLimination of defects on non-rigid road surfaces with the use of bitumen-mineraL mixtures by a jet-injection method. The resuLts of experimentaL studies carried out in the course of repair work on the second technicaL category road with high traffic intensity and increased axiaLLoad from vehicLes are presented. It was found out that the formation of the structure of the bitumen-mineraL mixture in the pothoLe of the road surface occurs over a reLativeLy Long period of time. Under the influence of contact stresses under the tire of the car, there are deformations of the material, the excess of whichLeads to its decompression. It is experimentaLLy proved that in order to increase the serviceLife of the repaired road surface, additionaL compaction of the bitumen-mineraL mixture is necessary. It was found that the excessLoad on the Layer of bitumen-mineraL mixture in the pothoLe coating at the stage of formation of its structure above the tensiLe strength contributes to the formation of pLastic deformations and reduce the required compaction coefficient. To improve the quaLity of repair work, it is necessary to Limit the axiaLLoad of vehicLes on the surface of the pothoLe for 20-30 days during the formation of the structure of the Laid materiaL in the pothoLe of the road surface.

scholarly journals Application of innovative materials in the construction of oil and gas processing facilities

2020 ◽  
Vol 217 ◽  
pp. 01013
Author(s):  
Victoria Holodkova ◽  
Yuri Ryabkin ◽  
Mikhail Kostyshak ◽  
Alexey Tchaikovsky
Keyword(s):  
Economic Efficiency ◽  
Oil And Gas ◽  
Innovative Technologies ◽  
Gas Processing ◽  
Far North ◽  
Comparative Calculation ◽  
Road Surfaces ◽  
Fiber Concrete ◽  
Nano Fiber ◽  
Innovative Materials

The article deals with the main aspects of construction of Bush sites in the difficult conditions of the far North. The main focus is on the effectiveness of the introduction of innovative technologies in the construction of road surfaces in such conditions with the use of nano-fiber concrete. A comparative calculation of the economic efficiency of using such technology with traditional ones is carried out.

scholarly journals THE FREQUENCY CHARACTERISTICS OF COUPLED MICROSTRIP LINES / SUSIETŲJŲ MIKROJUOSTELINIŲ LINIJŲ DAŽNINĖS CHARAKTERISTIKOS

2013 ◽  
Vol 5 (2) ◽  
pp. 173-180
Author(s):  
Audrius Krukonis ◽  
Šarūnas Mikučionis
Keyword(s):  
Dielectric Constant ◽  
Transmission Lines ◽  
Characteristic Impedance ◽  
Frequency Characteristics ◽  
Effective Dielectric Constant ◽  
Matching Layer ◽  
Microstrip Lines ◽  
Signal Conductor ◽  
Voltage Current Characteristic ◽  
Difference Time

The article deals with the use of the finite difference time domain method and uniaxial perfectly matching layer for analysis of frequency characteristics of coupled microstrip transmission lines. It describes calculation techniques for voltage, current, characteristic impedance and effective dielectric constant of each signal conductor. Besides, it analyses the frequency dependencies of characteristic impedance and the effective dielectric constant. Article in Lithuanian. Santrauka Straipsnyje aptariamas baigtinių skirtumų laiko srities metodo taikymas ir absorbuojančio sluoksnio taikymas susietųjų mikrojuostelinių linijų analizei. Sudaryti ir išnagrinėti baigtinių skirtumų laiko srities metodu grįsti susietųjų mikrojuostelinių linijų matematiniai modeliai. Pateikiamos kiekvieno iš laidininkų įtampos, srovės, charakteringojo impedanso ir efektyviosios dielektrinės skvarbos skaičiavimo metodikos. Aptariami skaičiavimo metodikų pranašumai, trūkumai, pateikiamos jų tobulinimo kryptys.

scholarly journals COMPETITIVE ADVANTAGES OF INNOVATIVE MATERIALS WHILE THE CONSTRUCTION OF ROAD BASE STRENGTHENED LAYERS

2019 ◽  
Vol 16 (1) ◽  
pp. 52-61
Author(s):  
E. A. Bedrin ◽  
E. A. Bedrina
Keyword(s):  
Road Construction ◽  
Legal Framework ◽  
Test Methods ◽  
Standard Test ◽  
Competitive Advantages ◽  
Repair Work ◽  
Innovative Technologies ◽  
The Road ◽  
Innovative Materials ◽  
Pavement Construction

Introduction. The introduction of innovative technologies and materials in road construction is difficult due to a number of constraints, the solution of which is an urgent task of the construction industry. The competitive advantages of innovative materials (polymer-mineral composition “Nicoflok”) relative to traditional ones are considered on the example of the soil strengthening technology. The results of the research show the inconsistency of the regulatory and legal framework of the road sector in terms of the innovative technologies (materials) application. Such results suggest quickly update, refining both the characteristics of materials and methods for assessing the usage effectiveness. Thus, it is possible to increase the reliability of decisions made on the repair and construction of roads, and, as a consequence, increase their service.Materials and methods. The research was carried out in the course of construction (repair) work on the pilot road sections, as well as after a year of their operation. The authors used the regulatory documents and standard test methods for determining the physic, mechanical and deformation characteristics of soils and materials reinforced by the Nicoflok. Taking into account the obtained characteristics of the materials, the authors calculated an equal strength pavement structure using a licensed software product. According to the developed design options, the estimated cost of pavement construction was also calculated.Results. The results of the research allow authors to conclude that the physic and mechanical characteristics of the reinforced material are improved. At the same time, the competitive ability for the additive usage also increases.Discussion and conclusions. The paper shows the inconsistency of the regulatory and legal framework in the road sector in terms of the application of innovative technologies (materials). Moreover, the authors suggest the need to quickly update, clarifying both the characteristics of materials and methods for evaluating the usage effectiveness.

Microstructural characterization of YBaCuO Films on LaAlO3 substrates

1989 ◽  
Vol 47 ◽  
pp. 180-181
Author(s):  
E. L. Hall ◽  
A. Mogro-Campero ◽  
N. Lewis ◽  
L. G. Turner
Keyword(s):  
Dielectric Constant ◽  
Single Crystal ◽  
Film Growth ◽  
Microstructural Characterization ◽  
Lattice Parameter ◽  
Film Plane ◽  
Substrate Material ◽  
High Loss ◽  
Amorphous Substrates ◽  
High Dielectric

There have been a large number of recent studies of the growth of Y-Ba-Cu-O thin films, and these studies have employed a variety of substrates and growth techniques. To date, the highest values of Tc and Jc have been found for films grown by sputtering or coevaporation on single-crystal SrTiO3 substrates, which produces a uniaxially-aligned film with the YBa2Cu3Ox c-axis normal to the film plane. Multilayer growth of films on the same substrate produces a triaxially-aligned film (regions of the film have their c-axis parallel to each of the three substrate <100> directions) with lower values of Jc. Growth of films on a variety of other polycrystalline or amorphous substrates produces randomly-oriented polycrystalline films with low Jc. Although single-crystal SrTiO3 thus produces the best results, this substrate material has a number of undesireable characteristics relative to electronic applications, including very high dielectric constant and a high loss tangent at microwave frequencies. Recently, Simon et al. have shown that LaAlO3 could be used as a substrate for YBaCuO film growth. This substrate is essentially a cubic perovskite with a lattice parameter of 0.3792nm (it has a slight rhombohedral distortion at room temperature) and this material exhibits much lower dielectric constant and microwave loss tangents than SrTiO3. It is also interesting from a film growth standpoint since it has a slightly smaller lattice parameter than YBa2Cu3Ox (a=0.382nm, b=c/3=0.389nm), while SrTiO3 is slightly larger (a=0.3905nm).

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