scholarly journals Safeguarding of Goods During Railway Shipping

2018 ◽  
Vol 7 (4.3) ◽  
pp. 246
Author(s):  
D V. Lomotko ◽  
A O. Kovalov ◽  
O V. Kovalova ◽  
J V. Shuldiner

The definition of estimation criterion of rolling stock availability for certain freight loading is given in this work. The level of commercial availability of cars is proposed as a criterion. The graphic display of the availability level of cars for loading depending on the service life of a car and with account for corresponding repair works and maintenance is represented. The dependence of the type of goods or the group of goods on the level of commercial car availability required for safeguarding during transportation of goods, for safety of operation and continuity of the rolling stock is introduced to provide the corresponding level of commercial rolling stock availability for the freight owner. The variant of the requirement formation for provision of cars using the category of commercial availability and the quantity of cars of the corresponding type is given, and the example of problem solving of supplying the freight owner with the cars of commercial availability that are not lower than needed is also proposed. 

Author(s):  
Aleksandr Babanin ◽  
Sergiy Yarovoy ◽  
Vadim Bulba

In clause questions of definition of a resource of the wheel motor block traction transfer of a motorcarload rolling stock are considered. Problems of forecasting of a technical condition of responsible units oftraction transfer are certain. The model of deterioration in which the periods extra earnings are allocated,normal operation, intensive deterioration and prolongation of service life of the wheel motor block of amotor carload rolling stock is formalized for weigh his life cycle. For each allocated period meetingdependences of speed and intensity of deterioration are offered. According to dependences calculations arelead and analytical expressions of wear of points of cog-wheels of power reducing of traction transfer whichallow to predict his resource in operation are received.


Author(s):  
Neil A. Cumming

This paper describes the author’s views on durability and service life of concrete bridges in North America, considering the past, present and future. Historical materials and practices have resulted in disappointing durability and service life that does not meet modern expectations. In recent years formal service life analysis and prediction has been implemented as part of the design process for major projects, typically involving numerical modelling of time to corrosion, and mitigation or avoidance of other forms of deterioration by empirical methodology. These efforts are, however, hampered by a lack of an accepted service life design standard which is adapted to North American practice and materials. Work is under way to answer this need. In the future, further development is needed to provide a better match between expectations and reality, a more practical definition of “service life”, validation of design features implemented to mitigate or avoid deterioration for which there are no available time-based models, and improved validation of numerical modelling parameters that describe exposure conditions and material resistances.


Author(s):  
A. Krasheninin

Modern vehicles operated on the railways of Ukraine have almost exhausted or exceeded their resource. The overuse of financial and material resources for their maintenance continues. The standard service life of vehicles was calculated on stable economic conditions of use of vehicles and their timely updating in process of aging. The service life of modern vehicles is determined by the influence of many factors, the disregard of which can lead to significant costs, even in compliance with the standard service life. For railway transport, these factors need modern clarification, as in operation their service life often exceeds the standard or, as for intermodal transport, the service life does not have a strict justification. Accordingly, the article analyzes the issues of assessing the impact on the service life of vehicles of the components of the cost of its maintenance and average daily mileage. It is shown that, firstly, the definition of the service life of vehicles must be linked to the cost of vehicle development, its creation, testing and production, the cost of operation and storage, as well as additional costs, and secondly , with the optimal average daily mileage, at which all the costs are minimal.


2018 ◽  
Vol 26 (1) ◽  
pp. 70
Author(s):  
Rômulo César Silva ◽  
Alexandre Ibrahim Direne ◽  
Diego Marczal ◽  
Ana Carla Borille ◽  
Paulo Ricardo Bittencourt Guimarães ◽  
...  

The work approaches theoretical and implementation issues of a framework for creating and executing Learning Objects (LOs) where problem-solving tasks are ordered according to the matching of two parameters, both calculated automatically: (1) student skill level and (2) problem solution difficulty. They are formally defined as algebraic expressions. The definition of skill level is achieved through a rating-based measure that resembles the ones of game mastery scales, while the solution difficulty is based on mistakes and successes of learners to deal with the problem. An empirical study based on existing students data demonstrated the suitability of the formulas. Besides, the motivational aspects of learning are considered in depth. In this sense, it is important to propose activities according to the student’s level of expertise, which is achieved through presenting students with exercises that are compatible with the difficulty degree of their cognitive skills. Also, the results of an experiment conducted with four highschool classes using the framework for the domain of logarithmic properties are presented.


2012 ◽  
Vol 446-449 ◽  
pp. 2313-2316
Author(s):  
Li Li Yuan ◽  
Jian Min Wang ◽  
Neng Jun Wang ◽  
Wen Ting Jiang

An analytical method to obtain the seismic fragility curve of reinforced concrete frames with service life was proposed in this paper. Considering the variation of nonlinear mechanical characteristics of un-carbonated concrete with service life, the seismic fragility curve of frames was developed based on the interstorey drift corner in the weak storey of frame structures. According to the damage state definition of frames, each seismic fragility curve reflects the probability tendency of the defined damage state happening in frames with service life. It is helpful for the seismic performance analysis of reinforced concrete frames to use the proposed method.


2021 ◽  
Vol 2021 (2) ◽  
pp. 28-37
Author(s):  
Yuriy Livcov ◽  
Vladimir Bezkorovaynyy ◽  
Andrey Kireev

The simplest and accessible method for rolling-stock axle surface strengthening is surface processing with cold plastic deformation by means of rolling. This process is one of the stages in manufacturing diesel locomotive and car axles of a rolling-stock. The basic parameters of rolling engineering process are micro-hardness of a metal surface strengthened layer and its depth, which at present are controlled by means of cutting out longitudinal polished specimens from the axle and in case of the deviation from the required value the whole set axles is rejected. That is why there is offered a method of the non-destruction control of micro-hardness and depth of axle strengthening the essence of which is not only in the control of a strengthening degree value, but in the instant correction of rolling equipment in case of the deviation from the parameter, as this device is integrated in the interface of a rolling machine. In such a way, an actual value of strengthened layer micro-hardness will be always within the specified limits. The principle of device operation is based on the topography changes in the scattering magnetic field of preliminary magnetized local volume of ferromagnetic material. There are shown numerical experiments for the dependence parameter definition of a scattering field of a magnetic mark from thickness and magnetic properties of a strengthened metal layer which had given a possibility to obtain the analytical dependences of a strengthened layer thickness and coercive force of the strengthened layer upon the parameters of a horizontal and vertical constituents of the scattering field strength of the magnetic mark. There are obtained results of natural experiments which allow defining magnetic properties of the upper metal layer in the axle and checking the correctness of data obtained at numerical computations, computation errors do not exceed 6%. The integration circuit of the mentioned structure-scope in the configuration of a rolling machine to obtain a feedback on a micro-hardness value of a surface strengthened layer.


2021 ◽  
Author(s):  
G. M. Volokhov ◽  
A. A. Lunin ◽  
D. A. Knyazev ◽  
V. V. Chunin ◽  
M. V. Timakov

Author(s):  
N. Radkevich ◽  
S. Sapronova ◽  
V. Tkachenko

In order to ensure the uninterrupted performance of passenger traffic, the task of ensuring the operation of rolling stock outside the extended service life, including passenger cars for the carriage of passengers, remains relevant. Based on this, there is a need for comprehensive research aimed at substantiating the possibility of ensuring operation while maintaining dynamic and strength characteristics. The article examines the residual life of load-bearing metal structures of passenger cars based on the results of technical diagnostics and standard tests. It is concluded that the condition of the load-bearing metal structures of passenger cars built by the Kryukiv Carriage Plant (KСP) after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of passenger cars for the construction of KCP beyond the factory set by 41 years.


Author(s):  
M. Finger

Two parallel evolutions are currently challenging the functioning and the legitimation of the traditional nation-state: globalization and the rapid development of the information and communication technologies (ICTs). Both come together in the new concept of “electronic governance” or “e-governance.” Indeed, globalization in all its forms (i.e., financial, economic, cultural, technological, and ecological globalizations) is increasingly putting pressure upon the nation-state. Collective problems, such as climate change or organized crime, can no longer be solved by nation-states only, let alone by one single nation-state. In fact, such problems require not only the supra-national approaches and institutions, but also the involvement of non-state actors, in particular of civil society and the private sector. Simultaneously, the ICTs are gradually penetrating all realms and all levels of society, and as such increasingly affect both production processes and state-society transactions. If “governance” can be defined as the growing involvement of non-state actors into collective problem-solving at all levels of society (i.e., from the local to the global levels) (e.g., Finger, 2004; Mayntz, 1999), “e-governance” then means the active usage of the ICTs for such collective problem solving. In this article we want to both offer an understanding what e-governance is and could be and outline of the different dimensions and forces which currently lead up to e-governance practices. Consequently, our article is structured as follows: in a first section, we will present and critically discuss the state of the literature on e-governance. In a second section, then, we will show how governance and the ICTs are currently coming together, and subsequently propose a definition of electronic governance.Two parallel evolutions are currently challenging the functioning and the legitimation of the traditional nation-state: globalization and the rapid development of the information and communication technologies (ICTs). Both come together in the new concept of “electronic governance” or “e-governance.” Indeed, globalization in all its forms (i.e., financial, economic, cultural, technological, and ecological globalizations) is increasingly putting pressure upon the nation-state. Collective problems, such as climate change or organized crime, can no longer be solved by nation-states only, let alone by one single nation-state. In fact, such problems require not only the supra-national approaches and institutions, but also the involvement of non-state actors, in particular of civil society and the private sector. Simultaneously, the ICTs are gradually penetrating all realms and all levels of society, and as such increasingly affect both production processes and state-society transactions. If “governance” can be defined as the growing involvement of non-state actors into collective problem-solving at all levels of society (i.e., from the local to the global levels) (e.g., Finger, 2004; Mayntz, 1999), “e-governance” then means the active usage of the ICTs for such collective problem solving. In this article we want to both offer an understanding what e-governance is and could be and outline of the different dimensions and forces which currently lead up to e-governance practices. Consequently, our article is structured as follows: in a first section, we will present and critically discuss the state of the literature on e-governance. In a second section, then, we will show how governance and the ICTs are currently coming together, and subsequently propose a definition of electronic governance.


Author(s):  
Marco Lamieri ◽  
Diana Mangalagiu

In this chapter we present a model of organization aimed to understand the effect of formal and informal structures on the organization’s performance. The model considers the interplay between the formal hierarchical structure and the social network connecting informally the agents emerging while the organization performs a task-set. The social network creation and evolution is endogenous, as it doesn’t include any function supposed to optimize performance. After a review of the literature, we propose a definition of performance based on the efficiency in allocating the task of a simulated organization that can be considered as a network-based problem-solving system. We analyze how the emergence of a stable process in decomposing tasks under different market conditions can alleviate the rigidity and the inefficiencies of a hierarchical structure and we compare the performance of different hierarchical structures under variable environment conditions.


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