Improved Gasket Testing

2013 ◽  
Author(s):  
Manfred Schaaf
Keyword(s):  
Calculation Procedure ◽  
Testing Procedures ◽  
Working Groups ◽  
European Standards ◽  
Gasket Material ◽  
Definition Of

At present, the European Standards EN 1591-1 which is used for the calculation of bolted flanged joints and EN 13555 in which the determination of the required gasket characteristics are defined are under revision. Several studies on gasket testing and on flange calculation have been performed in order to verify the suggested modifications of the standardization working groups. As a result of these studies several optimizations in respect of the testing procedures, the definition of the gasket characteristics and the calculation procedure can be derived. In this paper, additional or modified gasket characteristics such as the stiffness-independent gasket deflection, caused by creep of the gasket material or formulas for the description of the gasket compression curves, are presented. Several tests with diverse gasket materials were performed in order to generate generally admitted procedures to determine these required characteristics which are the basis for the advanced calculation procedure which will be presented in a second paper.

Proposed Modifications to the EN 1591-1 Flange Calculation Procedure

2013 ◽  
Author(s):  
Manfred Schaaf
Keyword(s):  
Calculation Procedure ◽  
Testing Procedures ◽  
Working Groups ◽  
European Standards ◽  
Gasket Material ◽  
Definition Of

At present, the European Standards EN 1591-1 which is used for the calculation of bolted flanged joints and EN 13555 in which the determination of the required gasket characteristics are defined are under revision. Several studies on gasket testing and on flange calculation have been performed in order to verify the suggested modifications of the standardization working groups. As a result of these studies several optimizations in respect of the testing procedures, the definition of the gasket characteristics and the calculation procedure can be derived. In this paper, an advanced calculation procedure will be presented which is based on the use of additional or modified gasket characteristics such as the stiffness-independent gasket deflection caused by creep of the gasket material or formulas for the description of the gasket compression curves are presented.

Creep Relaxation Characteristics in European Standards

2015 ◽  
Author(s):  
Manfred Schaaf
Keyword(s):  
Testing Procedure ◽  
Relaxation Factor ◽  
Relaxation Effects ◽  
Evaluation Algorithm ◽  
European Standards ◽  
Definition Of ◽  
Relaxation Characteristics ◽  
Calculation Code

The European Standards EN 1591-1 which is used for the calculation of bolted flanged joints and EN 13555 in which the determination of the required gasket characteristics are defined were reissued last year. The definition of the creep/relaxation factor in EN 13555 and EN 1591-1 has been modified in these new issues of the standards. Instead of the ratio between the remaining and the initial gasket stress, now the additional gasket deflection due to creep/relaxation effects is considered in the calculation code, and therefore also the evaluation of the corresponding gasket tests has been changed. In this paper the differences in the testing procedure and in the evaluation algorithm are shown, and also a proposal is given to simplify and to reduce the required creep/relaxation testing.

RESEARCH OF THE MAIN DIFFERENCES IN THE REQUIREMENTS FOR THE CONSTRUCTION OF VEHICLES MANUFACTURED FOR MARKETS OF DIFFERENT COUNTRIES

2019 ◽  
pp. 22-29
Author(s):  
Iurii Babin ◽  
Mykola Nazarenko ◽  
Rostyslav Nilov ◽  
Victor Pinchuk
Keyword(s):  
Road Traffic ◽  
The European Union ◽  
Design Requirements ◽  
European Standards ◽  
Definition Of ◽  
The Individual ◽  
State Registration ◽  
Wheeled Vehicles ◽  
Technical Regulations

Research of the main differences in the design requirements for wheeled vehicles manufactured for the markets of different countries. Review of the main legislative documents concerning the admission of RV to participation in road traffic and the state registration. Determination of the main differences RV, which were in use and were made for markets other than European, which are required pay attention to certification. Providing information and explanations for citizens wishing to purchase or have already purchased vehicles that were in use and manufactured for markets other than European, about the minimum design requirements for such vehicles, compliance with which is necessary for passing the inspection and obtaining a certificate of conformity according to the procedure for individual approval of wheeled vehicles. Definition of legislative documents about regulating the procedure for individual approval of vehicles in Ukraine. Providing information on the list of requirements (technical regulations), which must conform to the vehicle, past in usage, M1 and N1 categories for passing the procedure of individual approval of wheeled vehicles. Determination of the obligations of certification bodies in Ukraine to comply with the requirements of European standards and legislation of Ukraine during the procedure for individual approval of wheeled vehicles in Ukraine. Development and approval Technical service reports on the possibility of applying alternative technical regulations for the individual approval of completed wheeled vehicles of categories M1 and N1, which are manufactured in large series in / or for countries that are not member states of the European Union. Description of the main differences between the objects of approval that you need to pay attention to before passing certification. Keywords: RV certification, certification of cars intended for the US market, requirements for cars during certification.

State Failure and the Political Violence Phenomenon: A Comparative Analysis of Iraq and Syria Cases

2016 ◽  
Vol 4 (2) ◽  
pp. 170 ◽  
Author(s):  
K. Eylem Özkaya Lassalle
Keyword(s):  
Cold War ◽  
Political Violence ◽  
State Failure ◽  
The Political ◽  
Collective Violence ◽  
Short Run ◽  
Definition Of ◽  
The Cold War

The concept of failed state came to the fore with the end of the Cold War, the collapse of the USSR and the disintegration of Yugoslavia. Political violence is central in these discussions on the definition of the concept or the determination of its dimensions (indicators). Specifically, the level of political violence, the type of political violence and intensity of political violence has been broached in the literature. An effective classification of political violence can lead us to a better understanding of state failure phenomenon. By using Tilly’s classification of collective violence which is based on extent of coordination among violent actors and salience of short-run damage, the role played by political violence in state failure can be understood clearly. In order to do this, two recent cases, Iraq and Syria will be examined.

DEFINITION OF TIME SPENT ON REPAIR OF BUS TRANSMISSION UNITS TAKING INTO ACCOUNT TECHNOLOGICAL EQUIPMENT RELIABILITY

2020 ◽  
Vol 2020 (9) ◽  
pp. 29-33
Author(s):  
Sergey Bulatov
Keyword(s):  
Negative Impact ◽  
Probabilistic Method ◽  
Technological Equipment ◽  
Quality And Safety ◽  
Transmission Unit ◽  
Equipment Reliability ◽  
Hours Of Work ◽  
Definition Of ◽  
Time Decrease

The paper purpose is the effectiveness estimation in the technological equipment use, taking into account its reliability and productivity for defective transmission units of buses. The problem consists in the determination of time to be spent on repair of bus transmission units taking into account technological equipment reliability. In the paper there is used a probabilistic method for the prediction bus transmission units, and also a method of the dynamics of averages which allow ensuring minimum of costs for units downtime during repair and equipment cost. The need for repair of transmission units (gear box) arises on an average after 650 hours, the average productivity of the bench makes 4.2 bus / hour. The bench fails on the average after 4600 hours of work, the average time of the bench makes 2 hours. In such a way the solution of the problem specified allows analyzing the necessity of time decrease for transmission unit repair to avoid long downtimes of buses in repair areas without negative impact upon high repair quality and safety during the further operation.

Tests of jackhammers (formation of bench techniques)

2020 ◽  
pp. 28-32
Author(s):  
V.S. Vanaev
Keyword(s):  
Impact Energy ◽  
Bench Tests ◽  
Measuring Complex ◽  
Energy Indicators ◽  
Definition Of ◽  
Determination Of Parameters ◽  
Dynamic Indicators

Development of complex determination of parameters of jackhammers at bench tests is studied. The modern support of tests of jackhammers for the purpose of definition of their energy, vibration and noise indicators is considered. Descriptions of the SORP universal bench and UIPU measuring complex are given. Keywords jackhammer, bench, tests, processing object, energy indicators, impact energy, dynamic indicators [email protected]

Legal and regulative foundation of securing the development of consolidated territorial communities in conditions of decentralization

2019 ◽  
pp. 16-19
Author(s):  
Oryslava Korkuna ◽  
Ivan Korkuna ◽  
Oleh Tsilnyk
Keyword(s):  
Development Strategy ◽  
Local Governments ◽  
Local Governance ◽  
Legal Regulation ◽  
Major Elements ◽  
The Development Strategy ◽  
Social Entity ◽  
European Standards ◽  
Definition Of ◽  
State Regional

Development of a territorial community requires efficient use of its capacity taking into account all possible aspects in the course of elaboration and implementation of the development strategy and other local legal and regulative documents. The approach is directly related to maintaining the living activity of a territorial community and should correspond to the interests of population and European standards of state regional policy. In addition to the definition of a community provided by the Law of Ukraine “On Local Governance in Ukraine”, there are also some other. For example, some authors understand territorial community as a single natural and social entity that operates in spatial boundaries of a state and realizes daily needs and interests of population. The paper aims to analyze legal and regulative foundation of the development of territorial communities in conditions of decentralization. The authors analyze current condition of legal and regulative maintenance of local governance reforming in Ukraine in conditions of decentralization of authorities. The paper argues that the major elements of management strategy in CTCs in Ukraine are independence, efficiency, management innovations, quicker and more substantiated decision-making and everything to meet the needs of community’s residents. Management of this sector is grounded on the principles of the provisions of European Charter of Local Self-Government that provides for decentralization of authorities and transfer of resources and responsibilities to local governments. Liabilities of local governments (of consolidated territorial communities) and the mayors are analyzed. The authors prove that in general legal provision of decentralization of local governance corresponds to European requirements and creates reliable ground for practical stage of the reform. The list of issues that require further legal regulation is outlined.

Actual issues of valuation of businesses of the economic entity

2017 ◽  
Vol 31 (2) ◽  
pp. 156-162 ◽  
Author(s):  
O. V. Schneider
Keyword(s):  
Discount Rate ◽  
Accurate Prediction ◽  
Economic Activities ◽  
Business Valuation ◽  
Economic Entity ◽  
The World ◽  
Definition Of

The article summarizes the main approaches in the definition of business valuation the economic entity. In the process of business valuation, taking into account the risks of financial and economic activities necessary to obtain information on what stage the owner implements the business will receive income. The most difficult task is the impossibility of accurate prediction in determining the level of income and the determination of a discount rate capitalization of future incomes due to the instability of the economy, both in the country and around the world.

scholarly journals Betweenness centrality for temporal multiplexes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Silvia Zaoli ◽  
Piero Mazzarisi ◽  
Fabrizio Lillo
Keyword(s):  
Information Flow ◽  
Real World ◽  
Betweenness Centrality ◽  
Temporal Structure ◽  
Shortest Paths ◽  
Single Layer ◽  
Distance Metric ◽  
Definition Of

AbstractBetweenness centrality quantifies the importance of a vertex for the information flow in a network. The standard betweenness centrality applies to static single-layer networks, but many real world networks are both dynamic and made of several layers. We propose a definition of betweenness centrality for temporal multiplexes. This definition accounts for the topological and temporal structure and for the duration of paths in the determination of the shortest paths. We propose an algorithm to compute the new metric using a mapping to a static graph. We apply the metric to a dataset of $$\sim 20$$ ∼ 20 k European flights and compare the results with those obtained with static or single-layer metrics. The differences in the airports rankings highlight the importance of considering the temporal multiplex structure and an appropriate distance metric.

Forestry Working Groups/Groupes du travail

1989 ◽  
Vol 65 (3) ◽  
pp. 220-224
Author(s):  
J. J. E. Dosne
Keyword(s):  
Developing Countries ◽  
Natural Resources ◽  
Burkina Faso ◽  
New Caledonia ◽  
International Organisations ◽  
Tropical Forestry ◽  
Advantages And Disadvantages ◽  
Working Groups ◽  
Increasing Demand ◽  
Definition Of

The advantages and disadvantages of working in developing countries are reviewed. The definition of a developing country and the aid it receives from Canada are analysed. Projects in these countries do not harm the Canadian industry. The development of natural resources is a priority of international organisations, after health, sanitation and education. Organisations interested in this development are listed. A few notes of forestry projects in Turkey, Jamaica, Honduras, Burkina Faso, Haiti, Costa Rica are enclosed; as well as an ideal project in New Caledonia where they have assumed their own responsibility. A message: all Canadian faculties of forestry, should give a few courses on tropical forestry because of its need and the increasing demand for Canadian foresters in this field. All who have worked overseas agree that there is a certain satisfaction in having contributed to the advancement of developing countries.

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