METHODS TO ESTIMATE ECONOMIC EFFICIENCY OF APPLYING POLYMER-BITUMEN BINDERS

2021 ◽  
pp. 60-68
Author(s):  
Stanislav Guzhov ◽  
Azamat Sanakulov ◽  
Valentin Lebedev ◽  
Dmitriy Nebratenko
Keyword(s):  
Economic Efficiency ◽  
Methodological Approach ◽  
Operating Conditions ◽  
Small Scale ◽  
New Production ◽  
Laboratory Equipment ◽  
Repair Work ◽  
Methodological Basis ◽  
Wide Range ◽  
Effective Transfer

The implementation of the national project "Safe and High-quality Highways" is aimed at spreading the successful experience of using innovative materials, structures and technological solutions for federal projects at road facilities of regional and inter-municipal subordination. There are no approaches to evaluate the economic efficiency of using new and best technologies for the objects of regional subordination or they are not provided with a methodological basis for evaluating their total economic profitability. The objective of the research conducted by the group of authors is to develop methods to prove the efficiency of a wide range of innovations for objects of regional subordination. The research problem is to study the issues of effective transfer to the subjects of the Russian Federation of technological solutions used in construction and repair work on federal highways. This is due not only to the lack of experience in the application of innovations, the high cost of new production and laboratory equipment for their implementation, the small scale of the work carried out, but also significantly different operating conditions, maintenance of these road facilities. In this part of a comprehensive study conducted within the framework of the federal project "System-wide Measures for the Development of Road Facilities", the authors propose a methodological approach to calculating the efficiency of using polymer-bitumen binders. Cost-effectiveness analysis for arrangement of polymer-asphalt-concrete coatings on highways was used as the methodological basis for evaluating the economic efficiency of applying this technological solution.

scholarly journals Development of a Methodological Base for Assessing the Validity of Choice of an Outsourcing Organization in JSC «Russian Railways»

2021 ◽  
Vol 31 (2) ◽  
pp. 140-145
Author(s):  
Irina Solskaya ◽  
Sergey Belomestnykh
Keyword(s):  
Methodological Approach ◽  
Third Party ◽  
Party Organization ◽  
Repair Work ◽  
Methodological Basis ◽  
Repair Technology ◽  
Railway Infrastructure ◽  
General Contractors ◽  
Methodological Approaches ◽  
Infrastructure Repair

The issues of methodological support of interaction between a large transport company and its general contractors are becoming more significant due to the increasing number of types of activities transferred to outsourcing. The article investigated the main methodological approaches that determine the procedure for justifying the choice of an outsourcing organization and the relevant methods applied in practice, in particular, an assessment of the methodological basis for judging the effectiveness of the choice of infrastructure repair workflow was carried out. The analysis of the methods for justifying the choice of a third-party organization, performing railway infrastructure repair work, made it possible to form the author's methodological approach to the choice of a repair technology and an organization to perform it best on outsourcing basis. The specifics of the object, namely, JSC «Russian Railways», which provides strategically important services for the economy, allows us to recommend the proposed author's methodological approach to justifying the choice of a third-party organization performing work for other transport companies.

Predicting Heat Transfer From Unsteady Synthetic Jets

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
Mehmet Arik ◽  
Tunc Icoz
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Jet Impingement ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Operating Conditions ◽  
Small Scale ◽  
Wide Range ◽  
The Heat Transfer Coefficient

Synthetic jets are piezo-driven, small-scale, pulsating devices capable of producing highly turbulent jets formed by periodic entrainment and expulsion of the fluid in which they are embedded. The compactness of these devices accompanied by high air velocities provides an exciting opportunity to significantly reduce the size of thermal management systems in electronic packages. A number of researchers have shown the implementations of synthetic jets on heat transfer applications; however, there exists no correlation to analytically predict the heat transfer coefficient for such applications. A closed form correlation was developed to predict the heat transfer coefficient as a function of jet geometry, position, and operating conditions for impinging flow based on experimental data. The proposed correlation was shown to predict the synthetic jet impingement heat transfer within 25% accuracy for a wide range of operating conditions and geometrical variables.

A Study of the Performance of Inertia Air Filters

1969 ◽  
Vol 184 (3) ◽  
pp. 166-174
Author(s):  
D. E. Gee ◽  
B. N. Cole
Keyword(s):  
Performance Testing ◽  
Operating Conditions ◽  
Design Stage ◽  
Small Scale ◽  
Operating Characteristics ◽  
Test Rig ◽  
Fundamental Study ◽  
Air Filters ◽  
Test Programme ◽  
Wide Range

This paper presents an experimental and theoretical study of the design and performance of inertia air filters, with particular reference to rail traction duty. Using a specially constructed test rig, performance testing of commercially available filters was carried out over a wide range of operating conditions. Subsequently, a more fundamental study of some design variables was carried out in a small-scale test rig. The testing was supported by a theoretical approach using a digital computer model of the inertia filtration process. The results of the work indicate that the inertia filter is suited to high-volume, low pressure drop applications. However, operational difficulties, owing to dust build-up occurring within the filter and variations of bleed ratio, may be encountered. The theoretical model was shown to reproduce all the major operating characteristics of the filters measured in the test programme, and to respond to design changes in a similar way to that indicated by earlier published work. A hypothesis of the mechanism of separation is proposed, and it is suggested that the performance of new filter layouts can be examined at the design stage. Supporting work describes the selection, measurement, and production of a suitable range of polydisperse solids for the test programme.

scholarly journals Simulation of small-scale waste biomass gasification integrated power production: acomparative performance analysis for timber and wood waste

2020 ◽  
Vol 9 (2) ◽  
pp. 147 ◽  
Author(s):  
Sahar Safarian ◽  
Runar Unnthorsson ◽  
Christiaan Richter
Keyword(s):  
Moisture Content ◽  
Combustion Engine ◽  
Biomass Gasification ◽  
Operating Conditions ◽  
Wood Waste ◽  
Small Scale ◽  
Waste Biomass ◽  
Predictive Tool ◽  
Electrical Efficiency ◽  
Wide Range

<div data-canvas-width="75.53283108244308">A simulation model for integrated waste biomass gasification with cogeneration heat and power has been developed using Aspen Plus. The model can be used as a predictive tool for optimization of the gasifier performance. The system has been modeled in four stages. Firstly, moisture content of biomass is reduced. Secondly biomass is decomposed into its elements by specifying yield distribution. Then gasification reactions have been modeled using Gibbs free energy minimization approach. Finally, power is generated through the internal combustion engine as well as heat recovery system generator. In simulation study, the operating parameters like temperature, equivalence ratio (ER) and biomass moisture content are varied over wide range and their effect on syngas composition, low heating value (LHV) and electrical efficiency (EE) are investigated. Overally, increasing temperature and decreasing ER and MC lead to improvement of the gasification performance. However, for maximum electrical efficiency, it is important to find the optimal values of operating conditions.</div><div data-canvas-width="156.02508062890539">The optimum temperature, ER and MC of the down draft gasifier for timber and wood waste are 800 ̊C, 0.2- 0.3 and 5%. At such optimum conditions, CO and H</div><div>2 reach to the highest production and LHV and EE are around 7.064 MJ Nm-3 and 45%, respectively.</div>

scholarly journals The HyEnD stern hybrid sounding rocket project

2019 ◽  
Author(s):  
M. Kobald ◽  
C. Schmierer ◽  
U. Fischer ◽  
K. Tomilin ◽  
A. Petrarolo ◽  
...  
Keyword(s):  
Rocket Engine ◽  
Operating Conditions ◽  
Chamber Pressure ◽  
Sounding Rocket ◽  
Small Scale ◽  
Stable Operation ◽  
Hybrid Rocket ◽  
Wide Range ◽  
Hybrid Rocket Engine

The student team Hybrid Engine Development (HyEnD) of the University of Stuttgart is taking part with the Institute of Space Systems (IRS) in the DLR educational program STERN (Studentische Experimentalraketen). This program supports students at German universities to design, build, and launch an experimental rocket within a 3-year project time frame. HyEnD is developing a hybrid rocket called HEROS (Hybrid Experimental Rocket Stuttgart) with a design thrust of 10 kN, a total impulse of over 100 kN·s, and an expected liftoff weight up to 175 kg. HEROS is planned to be launched in October 2015 from Esrange in Sweden to an expected flight altitude of 40 to 50 km. The current altitude record for amateur rockets in Europe is at approximately 21 km. The propulsion system of HEROS is called HyRES (Hybrid Rocket Engine Stuttgart) and uses a paraffin-based solid fuel and nitrous oxide (N2O) as a liquid oxidizer. The development and the test campaign of HyRES is described in detail. The main goals of the test campaign are to achieve a combustion efficiency higher than 90% and provide stable operation with low combustion chamber pressure fluctuations. The successful design and testing of the HyRES engine was enabled by the evaluation and characterization of a small-scale demonstrator engine. The 500-newton hybrid rocket engine, called MIRAS (MIcro RAkete Stuttgart), has also been developed in the course of the STERN project as a technology demonstrator. During this test campaign, a ballistic characterization of paraffin-based hybrid rocket fuels with different additives in combination with N2O and a performance evaluation were carried out. A wide range of operating conditions, fuel compositions, injector geometries, and engine configurations were evaluated with this engine. Effects of different injector geometries and postcombustion chamber designs on the engine performance were analyzed. Additionally, the appearance of combustion instabilities under certain conditions, their effects, and possible mitigation techniques were also investigated. Concluding, the development and construction of an advanced, lightweight hybrid sounding rocket for the given requirements and budget within the DLR STERN program are described herein. The most important parts include a high thrust hybrid rocket engine, the development of a light weight oxidizer tank, pyrotechnical valves, carbon fiber rocket structure, recovery systems, and onboard electronics.

Analysis and Comparison Between Fixed and Variable Volume Ratio Expander for Micro-Scale ORC

2015 ◽  
Author(s):  
Sergei Gusev ◽  
Martijn van den Broek
Keyword(s):  
Waste Heat ◽  
Volume Ratio ◽  
Optimal Operation ◽  
Operating Conditions ◽  
Working Fluid ◽  
Small Scale ◽  
Variable Volume ◽  
Fixed Volume ◽  
Wide Range ◽  
The Right

Waste heat recovery has become very important in the last decennia. The Organic Rankine Cycle is the most popular technology to transform waste heat into mechanical work or electricity. While large and medium scale installations are widely available on the market for various temperature and power levels, small scale ORCs are still in a pre-commercial phase because of a relatively high specific price. To make small scale ORCs more attractive for potential customers, the price has to be drastically reduced which means reducing the manufacturing and assembling operations, the number of parts in assemblies and unification of these assemblies. In addition, the performance has to be increased by using advanced cycle architectures and the right fluids. Not only the right choice of the working fluid is important but also the expander built-in volume ratio (BVR) has to be optimal or improved. Neither a fixed volume ratio expander, nor a turbine can provide an optimal expansion of a working fluid in a wide range of operating conditions [1]. In automotive applications, for instance, a strongly fluctuating heat input will be introduced to an ORC unit. To estimate losses caused by non-optimal operation, a model of a volumetric expander has been developed and verified using the result of extensive test campaigns with a screw expander. The volume ratio of the expander mentioned cannot be physically changed, so under widely changing pressure ratio, caused by varying inlet waste heat and ambient temperatures, it operates mostly far from its design point. The model gives a possibility to vary the BVR in order to compare a fixed-volume ratio expander with a variable one. Benefits from replacement of this expander by an adaptive one are studied. Only steady states are taken into account since there is no dynamic model of this expander developed yet. As a consequence of the results obtained, a concept of a variable volume ratio expander is proposed.

Contactless Superconducting Magnetic Instrument for Precise Positioning in Cryogenic Environments

2013 ◽  
Author(s):  
J. L. Perez-Diaz ◽  
I. Valiente-Blanco ◽  
E. Diez-Jimenez ◽  
J. Sanchez-Garcia-Casarrubios ◽  
M. A. Alvarez-Valenzuela ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Magnetic Levitation ◽  
High Vacuum ◽  
Far Infrared ◽  
Operating Conditions ◽  
Guidance System ◽  
Small Scale ◽  
Large Area ◽  
Precision Engineering ◽  
Wide Range

There is an increasing demand of nanotechnology and nano-devices in microelectronics, optics, biomedical and precision engineering industries. In this context, a wide range of applications require micrometer/nanometer positioning within a long range. Ultra precision manufacturing and inspection systems in micro-automating semiconductor fabrication, nanopositioning and nanomeasuring machines (NPM-Machine), development of MEMS and NEMS, copying machines, stepper stages for photolithography, small-scale measuring machines (CMMs) for large area scanning or surface imaging in scanning probe microscopy (SPM) are a few examples of these applications. In some applications, cryogenic environments (temperatures below 120 K) are a desirable or mandatory condition. The sensitivity of a large number of sensors is greatly increased when they are at cryogenics temperatures, like for example, those required for far infrared interferometer spectroscopy. The operating conditions in these environments include very low temperatures but also high vacuum. In this context, it is challenging for mechanisms to overcome all the tribological problems associated with these conditions. In addition very low energy consumption is also desirable in cryogenic environments. The invention here presented is a contactless linear slider that gets benefit of superconducting magnetic levitation to obtain a nanometer resolution within a long stroke (∼ 15 mm), minimizing run-outs of the slider (in the micron scale). Moreover, due to self-stable levitation and guidance of the slider, the complexity of the control is significantly reduced and the power consumption minimized (of the order of mW). The linear slider can be divided in two subsystems: the guidance system and the actuating system. The guidance system is composed of a static guideline, made of two superconducting disks and a slider composed of a long permanent magnet. Due to the high translational symmetry of the magnetic field generated by the PM, a contactless sliding kinematic pair is established between the PM and the superconductors in the sliding DoF. Thus, the slider is able to be moved in the sliding direction with very low resistance. However, greater restoring forces appear if the PM is moved in any other direction. Due to the lack of contact between the moving parts is also suitable for operation in clean-room applications, like in semiconductor manufacturing industry. Ultimately, the device was designed, built and tested in a relevant cryogenic environment (15 K and high vacuum) and the results introduced and discussed.

scholarly journals Methodological basis of scientific research of intellectual property as a value-legal phenomenon

2021 ◽  
pp. 165-170
Author(s):  
M. V. Kotenko
Keyword(s):  
Intellectual Property ◽  
Scientific Knowledge ◽  
Methodological Approach ◽  
Scientific Research ◽  
Legal Aspects ◽  
Methodological Basis ◽  
Wide Range ◽  
The Subject ◽  
Methodological Strategy

The relevance of scientific knowledge of value and legal aspects of understanding intellectual property is revealed in the work. The philosophical and scientific basis of scientific research of value-legal aspects of understanding intellectual property is established. The scientific views of scientists concerning the understanding of the methodological basis of scientific research of state and legal phenomena and processes are generalized, the prospects of its application to the knowledge of value and legal aspects of intellectual property are determined, and possible scientific results can be obtained. It is concluded that the current state of scientific development of the problems of axiology of understanding intellectual property. Having identified and established the functional aspects of the methodological basis of knowledge of value and legal aspects of intellectual property, it is noted that the use of broad tools of modern methodology of knowledge of state legal phenomena and processes has a positive value only if the methodological strategy of scientific research as a whole. the prism of a specific approach to its perception and understanding. Otherwise, the scientific research itself will turn into an artificial application of methodological tools, the result of which will be a wide range of multi-vector, inconsistent information about the subject of research. Therefore, it is important to determine the methodological strategy of the study, which will be based on a specific methodological approach (approaches), which will generalize the understanding of the subject of research, which will be taken as a basis: first, determine its cognitive potential; secondly, the definition of methodological tools of the study; third, the study of those aspects that are insufficiently disclosed in legal science; fourth, the formation of a conceptual idea of the subject of research based on the results of its scientific knowledge. The author proves that it is most expedient to apply the «pluralistic approach» to the formation of the methodology of scientific research of value-legal aspects of intellectual property, which includes: 1) establishing the functional capabilities of generally accepted in the system of social sciences, legal sciences and legal theory methodological tools value-legal research of intellectual property, determination of cognitive perspective of its application; 2) determination of the advantages of a specific methodological approach to the value-legal study of intellectual property, which will determine the general cognitive strategy of this scientific work, which we will emphasize separately in the next section of the dissertation. This approach, in our opinion, will combine the general doctrinal vision of the problem of value and legal dimension of intellectual property, determine its purpose, set research objectives, as well as to clarify the specific instrumental mechanisms for achieving it. Keywords: intellectual property, legal value of intellectual property, methodological basis, axiological methodological approach, axiological aspects of understanding intellectual property.

scholarly journals Modernization of the cooling system in tractors with gas engines

2020 ◽  
Vol 224 ◽  
pp. 04048
Author(s):  
N. A. Bolshakov ◽  
O N Didmanidze ◽  
E P Parlyuk
Keyword(s):  
Thermal Regime ◽  
Cooling System ◽  
Weight Ratio ◽  
Operating Conditions ◽  
Working Environment ◽  
New Production ◽  
Theoretical Terms ◽  
Cooling Systems ◽  
Wide Range ◽  
Functional Units

With an increase in the power/weight ratio of vehicles in cities and towns, the thermal loads of many functional units increase significantly. This requires the organization of the removal of excess heat into the environment, since the violation of the proper thermal regime in individual functional units prevents the realization of the potential operational properties of the entire vehicle up to failure. At the same time, the variety of operating conditions for vehicles, causing a change in a wide range of factors of the working environment, especially road and climatic ones, creates a difficult, both in practical and theoretical terms, problem of ensuring the required thermal regime for functional units. In this regard, the paper presents a consistent development of the theory of hydrothermodynamic properties of functional units based on the principles of constructing the operational properties of vehicles. The problems determining the further search and scientific substantiation of meters and indicators for assessing the efficiency of cooling systems, as well as the development of methods, tools and equipment for calculating and studying these systems are considered. At the same time, the work presents the improvement of the working process and designs of gas engines of tractors aimed at increasing reliability through the use of new production technologies. In conclusion, the definition of scientifically grounded methods and practical solutions for improving the performance of cooling systems is given, which has an important scientific and economic significance for increasing the operational properties of agricultural tractors, substantiating the current importance.

scholarly journals Performance attributes of an unmanned aerial vehicle (UAV) con gured for aerial pesticide application operations

2017 ◽  
Vol 70 ◽  
pp. 322 ◽  
Author(s):  
B. Richardson ◽  
S.F. Gous ◽  
W.C. Schou ◽  
T.M. Strand ◽  
L.A.H. Wright
Keyword(s):  
New Zealand ◽  
Urban Environments ◽  
Operating Conditions ◽  
Small Scale ◽  
Pesticide Application ◽  
Early Results ◽  
Wide Range ◽  
Aerial Vehicle ◽  
Aerial Platforms ◽  
Release Height

There is worldwide interest in the use of unmanned aerial vehicles (UAVs) or drones for a wide range of purposes. One area of focus relevant to New Zealand is use of UAVs as aerial platforms for pesticide spray operations. While not yet in common use in New Zealand, there are many potential areas of application for this type of technology including small scale pest eradication operations in urban environments as part of biosecurity responses, treatment of widespread wilding conifers with herbicides, and small-scale pest management operations in a range of productive sector environments. One example of the latter currently being investigated is application of herbicide to compartment edges in forestry situations where the lower release height compared with a helicopter could significantly reduce spray drift. This poster summarises early results from studies to quantify some performance attributes of a UAV con gured for both biosecurity and conventional spray operations. Swath patterns were measured from a UAV configured with a range of nozzle types and under various operating conditions. From these data, potential work rates were calculated for different application scenarios.

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