scholarly journals About trends of improvement of technological schemes for methane recovery from the rock-coal massif

2019 ◽  
Vol 109 ◽  
pp. 00046
Author(s):  
Serhii Kurnosov ◽  
Volodymyr Zerkal
Keyword(s):  
Experimental Studies ◽  
Methane Recovery ◽  
Gas Drainage ◽  
Normative Documents ◽  
The Road ◽  
Methane Flow Rate ◽  
Significant Length ◽  
Promising Solution ◽  
Seam Mining ◽  
Methane Flow

Purpose of the research was to improve efficiency of underground gas drainage from the rock-coal massif. It is substantiated that most promising solution of the problem of increasing efficiency of gas drainage from the massif is to mine additional gas-drainage road. This approach allows separating processes of coal mining and methane recovery in space and time. The Ukrainian normative documents is recommended to mine the road behind zones with high rock pressure. We found that in difficult conditions of coal seam mining, distance from road to working long wall would be more than 100 m. This distance reduces efficiency of gas drainage and is not economically feasible due to significant length of gas-drainage boreholes and air breakthroughs. Therefore, gas-drainage road should be located as close to the working long wall as possible, but with possibility to ensure its stability during its entire service life. Experimental studies were conducted in Zasyadko Mine and Krasnolymanska Mine. It is established that with increasing distance from working wall to the gas-drainage road location in the massif, unloaded by the under working displacement, the road contour decreases, and methane flow rate increases in power dependencies. Use of these results will make calculation of the gas-drainage road rational location more accurate.

scholarly journals Simulation Study of the Process of Friction in the Working Elements of a Car Braking System at Different Degrees of Wear

2018 ◽  
Vol 12 (3) ◽  
pp. 221-226 ◽  
Author(s):  
Andrzej Borawski
Keyword(s):  
Simulation Study ◽  
Friction Pair ◽  
Experimental Studies ◽  
Real Life ◽  
Operating Conditions ◽  
Heating Process ◽  
Passenger Cars ◽  
The Road ◽  
Emergency Braking ◽  
Braking System

Abstract Among the many elements of a modern vehicle, the braking system is definitely among the most important ones. Health, and, frequently, life, may rest upon the design and reliability of brakes. The most common friction pair used in passenger cars today is a disc which rotates with the road wheel and a cooperating pair of brake pads. The composite material of the pad results in changing tribological properties as the pad wears, which was demonstrated in experimental studies. The change is also facilitated by the harsh operating conditions of brakes (high and rapid temperature changes, water, etc.). This paper looks into how changing tribology reflects on the heating process of disc and pads during braking. And so a simulation study was conducted, as this method makes it possible to measure temperature in any given point and at any time, which is either impossible or extremely difficult in real life conditions. Finite element method analyses were performed for emergency braking events at various initial speeds of the vehicle reflecting the current road speed limits.

scholarly journals A new approach to assess the influence of road roughness on driver speed behavior based on driving simulator tests

2016 ◽  
Vol 11 (2) ◽  
pp. 144-152 ◽  
Author(s):  
Mariano Pernetti ◽  
Mauro D’Apuzzo Mauro D’Apuzzo ◽  
Francesco Galante
Keyword(s):  
Driving Simulator ◽  
Experimental Studies ◽  
Vertical Vibration ◽  
The Other ◽  
Added Value ◽  
Published Data ◽  
Vehicle Speed ◽  
Safety Level ◽  
The Road ◽  
Road Roughness

Vehicle speed is one of main parameters describing driver behavior and it is of paramount importance as it affects the travel safety level. Speed is, in turn, affected by several factors among which in-vehicle vibration may play a significant role. Most of speed reducing traffic calming countermeasures adopted nowadays rely on vertical vibration level perceived by drivers that is based on the dynamic interaction between the vehicle and the road roughness. On the other hand, this latter has to be carefully monitored and controlled as it is a key parameter in pavement managements systems since it influences riding comfort, pavement damage and Vehicle Operating Costs. There is therefore the need to analyse the trade-off between safety requirements and maintenance issues related to road roughness level. In this connection, experimental studies aimed at evaluating the potential of using road roughness in mitigating drivers’ speed in a controlled environment may provide added value in dealing with this issue. In this paper a new research methodology making use of a dynamic driver simulator operating at the TEST Laboratory in Naples is presented in order to investigate the relationship between the driver speed behavior on one hand, and the road roughness level, road alignment and environment, vehicle characteristics on the other. Following an initial calibration phase, preliminary results seem fairly promising since they comply with the published data derived from scientific literature.

Experimental Studies of the Primary Zone Flow Field and Combustion Performance of a Triple Swirler Combustor

2005 ◽  
Author(s):  
Yunhui Peng ◽  
Quanhong Xu ◽  
Yuzhen Lin
Keyword(s):  
Flow Field ◽  
Experimental Studies ◽  
Fuel Injector ◽  
Lean Blowout ◽  
Combustion Performance ◽  
Primary Zone ◽  
Image Velocimetry ◽  
Aero Engine ◽  
Exit Temperature ◽  
Promising Solution

Improvement of the lean blowout limit and more uniform combustor exit temperature distribution are particularly desirable for future aero engine. A triple swirler combination plus an airblast fuel injector might be a promising solution. The design with the triple swirler plus the airblast fuel injector including design A and B was presented and investigated in this paper. Single rectangle sector module combustor was used in the experiment for lean blowout (LBO), and three cups rectangle sector combustor was used for pattern factor (PF) experiments. The LBO and PF experiment data were provided. The primary zone flow field was measured by PIV (Particle Image Velocimetry) under atmospheric pressure and temperature. The result showed that the design A was a promising design, and the primary jet played very important role for flow field of primary zone. The insight relation between flow field and combustion performance could be found out from this paper.

scholarly journals The appliance of prefabricated soil-cement slabs processed with a hydrophobizing material for the road construction

2018 ◽  
Vol 196 ◽  
pp. 04026
Author(s):  
Sergey Sannikov ◽  
Sergey Kuyukov ◽  
Alexey Zamyatin ◽  
Alexandr Zhigailov
Keyword(s):  
Crack Formation ◽  
Experimental Studies ◽  
Road Construction ◽  
Full Scale ◽  
Complex Method ◽  
The Road ◽  
Soil Cement ◽  
Cement Mixture ◽  
Scale Experiment

The paper presents a complex method for increasing water resistance and reducing crack formation by using a prefabricated foundation of soil-cement slabs with surface processing with a hydrophobizing material on basis of organosilicon compounds. Theoretical, laboratory and full-scale experimental studies were made. Theoretical studies are based on the substantiation of the geometric parameters of the slab in order to exclude the probability of its destruction under its own weight during building and installation works. The result of the first stage of laboratory studies is the determination of the optimum composition of soil-cement mixture in order to achieve a grade of strength M20. At the second stage, the effectiveness of the influence of hydrophobizing materials "Tiprom U" and "Penetron-Admix" on water absorption and compressive strength of soil-cement was determined. The final stage of the research was a full-scale experiment. In the factory environment, soil-cement slabs were manufactured in metal forms. Based on the results of the research, conclusions about the effectiveness of this complex method were made. The use of soil-cement slabs allows reducing crack formation, as well as to work all year round due to manufacturing and surface treatment of slabs in the factory conditions.

Development and Analysis of Robust Anti-Wear Design of a-C:Zr Films by Taguchi Methods

2011 ◽  
Vol 189-193 ◽  
pp. 3647-3652
Author(s):  
Wesley Huang ◽  
Ching Jyi Chen ◽  
Ming Der Jean
Keyword(s):  
Friction Coefficient ◽  
Bias Voltage ◽  
Flow Rate ◽  
High Hardness ◽  
Pulse Frequency ◽  
Taguchi Methods ◽  
Control Factors ◽  
Methane Flow Rate ◽  
Percent Contribution ◽  
Methane Flow

Amorphous carbon (a:C-H) coatings with high hardness and low friction coefficient are widely applied in die and mold industries. Zirconium-containing a:C-H (a-C:Zr) coatings with double interlayered Zr/ZrC were deposited by unbalanced magnetron sputtering system. A L18 orthogonal array experiment was designed to investigate the effect of process parameter on the friction coefficient of deposited films. Control factors, such as methane flow rate, bias voltage, sputtering frequency, zirconium target current and work distance were schematized for experiments. The experimental results show that zirconium target current exhibits about 45% percent contribution in analysis of variance, and the friction coefficient of a-C:Zr coatings range from 0.13 to 0.31. From effect plots, the optimum parameters are bias voltage at -70V, zirconium target current at 0.6 A, pulse frequency at 90 kHz, methane flow rate at 6 sccm and work distance at 15 cm. The friction coefficient performs as 0.106 in verification experiments. Meanwhile, one-by-one factorial experiments were also carried out and discussed in this study.

Diamond-like carbon deposited by plasma technique as a function of methane flow rate

2010 ◽  
Vol 19 (7-9) ◽  
pp. 756-759 ◽  
Author(s):  
G.A. Viana ◽  
E.F. Motta ◽  
M.E.H.M. da Costa ◽  
F.L. Freire ◽  
F.C. Marques
Keyword(s):  
Flow Rate ◽  
Diamond Like Carbon ◽  
Plasma Technique ◽  
Methane Flow Rate ◽  
Methane Flow

scholarly journals Results of comparative experimental studies of turning conditions of tractor trains and observance of the width of the transport corridor

2021 ◽  
Vol 3 (45) ◽  
pp. 20-20
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Plant Protection ◽  
Experimental Studies ◽  
Emergency Situation ◽  
Plant Protection Products ◽  
Automatic Device ◽  
The Road ◽  
Emergency Situations ◽  
Transport Unit ◽  
Turning Radius ◽  
Safe Transport

Improving the efficiency of using tractor-transport units (tractor trains) in the central agricultural zone of the Amur Region is an economically important issue, especially relevant for small peasant farms. This is due to the fact that in such farms the area of fields occupied for the cultivation of agricultural crops is relatively small, while most of them belong to the category of slope lands. It was also found that during the periods of sowing and harvesting operations, traffic on agricultural roads is hampered by safety conditions due to regional climatic features, which include a large amount of precipitation. In this connection, the use of vehicles for the transportation of seed, fertilizers, plant protection products and other goods, and the export of crops in these conditions seems to be a rather complicated operation. It should be borne in mind that in many, the main energy means are wheeled tractors of class 1.4, and not cars of various cross-country ability, therefore, in order to increase the efficiency of the use of available mechanization means, it is necessary to use them for the transport of goods, and as part of multi-link tractor trains in particular. At the same time, when driving on on-farm field roads with a limited width, the turn of multi-link trains is difficult due to the failure of the second and subsequent aggregated trailers to comply with the safe transport corridor, since the second trailer, when turning, shifts to the center of the road and creates an emergency situation for oncoming traffic. In order to eliminate the identified shortcomings and create safe conditions for traffic, an automatic device was developed that allows you to shift the second trailer when turning from the center to the side of the passing traffic, thereby regulating the transport corridor and not creating emergency situations for oncoming traffic. The paper presents the results of experimental studies on the use of a transport unit consisting of a class 1.4 tractor and two 2PTS-4 trailers in the production modes of multi-link tractor trains. Keywords: TRACTOR, TURN, TURNING RADIUS, TRAILER, OFFSET, WIDTH OF THE TRANSPORT CORRIDOR, EFFICIENCY

scholarly journals The 100th birth anniversary of Ravil Garifovich Imangulov

2021 ◽  
Vol 23 (3) ◽  
pp. 259-265
Author(s):  
Еlena V. Davydova ◽  
Alexander V. Starkov ◽  
Alexander N. Grebenyuk
Keyword(s):  
Medical Science ◽  
Military Medicine ◽  
Experimental Studies ◽  
Practical Implementation ◽  
Mass Destruction ◽  
Normative Documents ◽  
Military Medical Academy ◽  
Teaching Aids ◽  
Medical Academy ◽  
The Military

October 12, 2021, marks the 100th anniversary of the birth of the Head of the Department of Medical Protection, Head of the Department of Armed Defeat and Protection of the Medical Academy, the Great Patriotic War, Doctor of Medical Sciences, Professor, and Colonel of the Medical Service, Ravil Garifovich Imangulov. For many years, R.G. Imangulov fruitfully worked in the field of military medical science and gone through all formational stages of a scientist and a teacher from an adjunct to the head of the department and professor-consultant of the Academic Council of the Military Medical Academy. During his service at the Military Medical Academy, Professor R.G. Imangulov took an active part in testing weapons of mass destruction and special field experimental studies in various regions of the country, aimed at the practical implementation of the latest achievements in the field of medical and technical means of anti-chemical and anti-radiation protection. For a long time, under his leadership and with his direct participation, fundamental research was carried out on the fundamentals of medical protection of troops and population from mass destruction weapons. His achievements in the field of medical protection against mass destruction weapons, both educational and scientific and practical disciplines, are of great importance for Russian military medicine. His fruitful years of activity did not only result in monographs, textbooks, teaching aids, scientific reports, and articles, but also the adaptation of official normative documents for the military personnel protection from mass destruction weapons, technical and medical means of individual, and collective protection.

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