Analysis of the Impact Factor of Rail Grinding on Their Condition

2021 ◽  
Author(s):  
◽  
Viktors Ivanovs
Keyword(s):  
Rail Steel ◽  
Doctoral Degree ◽  
Wheel Surface ◽  
Doctoral Thesis ◽  
Grinding Method ◽  
Rail Grinding ◽  
Train Operation ◽  
Wear Reduction ◽  
The Impact ◽  
Flange Angle

The Doctoral Thesis “Analysis of the impact of rail grinding on their condition” is developed by Viktors Ivanovs to obtain a Doctoral Degree in Engineering. The scientific supervisor is Assoc. Professor Dr. sc. ing. Pāvels Gavrilovs. In this Doctoral Thesis rail steels are considered according to standards EN 13674-1:2011 and GOST R 51685-2013. Rail steel defects and reasons for their causes are reviewed. The statistics of damaged and heavily damaged rails in the network “Latvijas dzelzceļš” in the period 2011–2019 is studied and analysed in detail. The statistics of rail grinding train operation in “Latvijas dzelzceļš” within the year period 2011–2019 is gathered and analysed. A research of hardness of 60 E1 type rail running surface, of metal chemical composition of the damaged rail with code X 10.1., and structure analysis was performed. Likewise, statistics of wheelset rejection in the network “Latvijas dzelzceļš” in the period 2016–2019 are gathered and analysed, as well as the number of wheel rim defects in the railway of Russian Federation. The main defects of wheelsets are reviewed. The actual wear of wheels and rails in Latvia and the stated wear in the railway of Russia are modelled. Repair profiles of rail head grinding for Latvian rail ways are modelled and their influence on side wear determined due to the rail and wheel surface interaction. Calculations regarding the wheels with flange angle of 66.8° from worn out profile durability coefficient were performed for Latvian railway according to the entry conditions on rail profiles, developed in this dissertation. A rail grinding method was developed. The wheelset repair and wheel grinding economic expenses were calculated. Recommendations for wheel and rail side wear reduction are presented.

What Does a Doctoral Degree in Rehabilitation Counseling Bring to Speech-Language Pathology Programs?

2012 ◽  
Vol 15 (2) ◽  
pp. 63-69
Author(s):  
Joseph P. Agan
Keyword(s):  
Rehabilitation Counseling ◽  
Doctoral Degree ◽  
Interdisciplinary Studies ◽  
Master's Level ◽  
Speech Language Pathology ◽  
Research And Teaching ◽  
Personal Experiences ◽  
Language Pathology ◽  
Interdisciplinary Study ◽  
The Impact

In this paper, I will describe the potential contributions of interdisciplinary studies combining speech-language pathology and rehabilitation counseling in the preparation of future speech-language pathologists (SLPs). I will provide a brief introduction to the field of rehabilitation counseling and consider it from an SLP’s perspective. Next, I will describe some of my own personal experiences as they pertain to the intersecting cultures of work and disability and how these experiences influenced my practice as a master’s level SLP eventually leading to my decision to pursue a doctoral degree in rehabilitation counseling. I will describe the impact of this line of interdisciplinary study on my research and teaching. Finally, I will present some arguments about why concepts relevant to rehabilitation counseling are important to the mindset of SLPs.

Notch-based speed trajectory optimisation for high-speed railway automatic train operation

2021 ◽  
pp. 095440972110421
Author(s):  
Minling Feng ◽  
Chaoxian Wu ◽  
Shaofeng Lu ◽  
Yihui Wang
Keyword(s):  
High Speed ◽  
Applied Force ◽  
Mixed Integer ◽  
High Speed Railway ◽  
Train Operation ◽  
Train Speed ◽  
Automatic Train Operation ◽  
The Impact ◽  
Trajectory Optimisation

Automatic train operation (ATO) systems are fast becoming one of the key components of the intelligent high-speed railway (HSR). Designing an effective optimal speed trajectory for ATO is critical to guide the high-speed train (HST) to operate with high service quality in a more energy-efficient way. In many advanced HSR systems, the traction/braking systems would provide multiple notches to satisfy the traction/braking demands. This paper modelled the applied force as a controlled variable based on the selection of notch to realise a notch-based train speed trajectory optimisation model to be solved by mixed integer linear programming (MILP). A notch selection model with flexible vertical relaxation was proposed to allow the traction/braking efforts to change dynamically along with the selected notch by introducing a series of binary variables. Two case studies were proposed in this paper where Case study 1 was conducted to investigate the impact of the dynamic notch selection on train operations, and the optimal result indicates that the applied force can be flexibly adjusted corresponding to different notches following a similar operation sequence determined by optimal train control theory. Moreover, in addition to the maximum traction/braking notches and coasting, medium notches with appropriate vertical relaxation would be applied in accordance with the specific traction/braking demands to make the model feasible. In Case study 2, a comprehensive numerical example with the parameters of CRH380AL HST demonstrates the robustness of the model to deal with the varying speed limit and gradient in a real-world scenario. The notch-based model is able to obtain a more realistic optimal strategy containing dynamic notch selection and speed trajectory with an increase (1.622%) in energy consumption by comparing the results of the proposed model and the non-notch model.

scholarly journals The Influence of the Track Parameters on Vibration Characteristics of Subway Tunnel

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Wenbo Shi ◽  
Linchang Miao ◽  
Junhui Luo ◽  
Honglei Zhang
Keyword(s):  
Soft Soil ◽  
Power Level ◽  
Coupling Model ◽  
Calculation Model ◽  
Vertical Acceleration ◽  
Subway Tunnel ◽  
Ballastless Track ◽  
Train Operation ◽  
The Impact ◽  
Wheel Track

In soft soil areas, such as the Nanjing, it is very important to quantitatively analyze the dynamic behaviors of soft soils during the metro train operation. A nonlinear coupling model of wheel-track and a finite element calculation model of tunnel and soil were established based on the mechanical character of elastic supporting block ballastless track and the actual parameters of Nanjing soft soil. The time-variant vertical acceleration of the rail, the sleepers, and the surface of the tunnel can be calculated by the models, and the frequency dependence acceleration was verified by the fast Fourier transform algorithm. A modified vibration power level for human sensitivity was used to quantify the vibration energy of each part of the system, and the impact of the parameters in the model was evaluated. The results can be applied to the metro design and construction, which also can be the guidance during the tunnel construction.

scholarly journals Bringing the doctoral thesis by published papers to the Social Sciences and the Humanities: a quantitative easing?

2019 ◽  
Author(s):  
John Rigby ◽  
Barbara Jones
Keyword(s):  
Social Sciences ◽  
Higher Education ◽  
Doctoral Degree ◽  
Education Sector ◽  
Academic Field ◽  
Doctoral Thesis ◽  
Social Sciences And Humanities ◽  
Scientific Disciplines ◽  
The Social ◽  
The Uk

This paper reflects on alternatives to the traditional form of doctoral thesis which are emerging to reflect a new approach to the valuation and designation of scientific outputs. We examine the changes and consider some implications. We suggest that the adoption of co-citation as underpinning principle for the measurement of knowledge structures has led to re-designation of the value of knowledge and knowledge producers in increasingly quantitative terms. We use notions of ‘institution’ and ‘logic’ to better understand such a change and its implications. Under a new logic that is gradually embedding itself across the higher education sector, the ‘constitutive rules’ concerned with the value of research now prioritize quantification, and tangibility of output, and quality is increasingly equated with citation. Whilst the scientific disciplines have traditionally been closer to this model, albeit with significant national variations, subjects within the Social Sciences and Humanities are now being affected. We present evidence from a small study of the UK higher education sector of university regulation of doctoral degree submission format in two disciplines in the Humanities and Social Sciences (History and Sociology). Our evidence shows the recent and gradual adoption of a practice, previously more common in scientific disciplines, that allows the doctoral thesis to be constituted by a series of publishable papers, known by a variety of names, the most common being ‘Thesis by Published Papers’, ‘Journal Format Thesis’, ‘Alternative Format Thesis’, and ‘Integrated Thesis’. As the thesis of the Social Sciences and Humanities – itself an important institution in the academic field - begins to reflect a greater emphasis upon quantity of knowledge outputs, a tension emerges with the most central of all scientific institutions, the peer-reviewed journal paper.

Africa between Gandhi and Nehru

2017 ◽  
Vol 16 (1-2) ◽  
pp. 14-30
Author(s):  
Ali A. Mazrui
Keyword(s):  
South Africa ◽  
Twentieth Century ◽  
Foreign Policy ◽  
Civil Disobedience ◽  
Nobel Laureate ◽  
Colonial Era ◽  
Doctoral Thesis ◽  
Post Colonial ◽  
Oxford University ◽  
The Impact

The author’s interest in Africa’s relations with India goes back to his doctoral thesis at Oxford University, published under the title of Towards a Pax Africana. The impact of India upon twentieth century Africa has a special place for Gandhi’s strategies of civil disobedience and Nehru’s principle of nonalignment. Gandhi’s satyagraha (soul force) inspired African political figures as diverse as Nobel laureate Albert Luthuli of South Africa and Ivorian president Houphouet-Boigny. Nehru’s ideas about what used to be called “positive neutralism” helped to shape African approaches to foreign policy in the entire post-colonial era. The essay, published almost two decades ago, explored these historical dimensions in this prescient analysis.

scholarly journals AACSB International’s 2013 accreditation standards

2014 ◽  
Vol 7 (2) ◽  
pp. 86-107 ◽  
Author(s):  
Morgan P. Miles ◽  
Geralyn McClure Franklin ◽  
Kirk Heriot ◽  
Linda Hadley ◽  
Mary Hazeldine
Keyword(s):  
Doctoral Degree ◽  
Business Faculty ◽  
Senior Faculty ◽  
Leadership Positions ◽  
Content Type ◽  
Guiding Principle ◽  
Accreditation Standards ◽  
Starting Point ◽  
Professional Leadership ◽  
The Impact

Purpose – The purpose of this paper is to consider the implications of the 2013 Association to Advance Collegiate Schools of Business (AACSB) Accreditation Standards for both business faculty and their deans who are responsible for implementing these changes. Design/methodology/approach – This paper is a speculative viewpoint on the implications of the 2013 AACSB standards by a set of a co-authors that include AACSB deans who are active in accreditation reviews and serve as mentors to schools in the accreditation process and senior faculty who have written self-studies for AACSB and served as consultants for schools seeking AACSB accreditation internationally. Findings – The implications of the 2013 AACSB business accreditation standards are arguably positive for active scholars holding a relevant doctoral degree. For example, active and engaged scholarly faculty should appreciate the ability to use additional indicators of the impact of their career’s intellectual contributions (IC) including, but not limited to, citations, editor ships, professional leadership positions and other measures of professional esteem. Research limitations/implications – The implications of the 2013 AACSB accreditation standards for deans are potentially less positive. The new standards codify one of the deans’ major duties – that of ensuring that the faculty have resources adequate to support the school’s mission. Originality/value – This paper represents a starting point for understanding the implications of the 2013 AACSB accreditation standards, and that as the standards are operationalized over the subsequent years that these standards, like the previous changes in AACSB standards, will stimulate additional research on business school accreditation. The implications for both faculty and deans are speculative, but are grounded both by the literature and experience of the authors. The paper uses a set of tables to illustrate the impact of the new AACSB standards with examples for each guiding principle and standard.

Did Clive Barker Write The Hostage?

2007 ◽  
Vol 23 (4) ◽  
pp. 326-330
Author(s):  
June Favre
Keyword(s):  
Sudden Death ◽  
Doctoral Degree ◽  
The Sun ◽  
Doctoral Thesis ◽  
Brendan Behan ◽  
National University ◽  
External Examiner

Clive Barker often wrote about Joan Littlewood and his time at Theatre Workshop with a mixture of warmth and bewilderment at her unorthodox methods. While preparing her doctoral thesis, Text and Collaboration: an Examination of the Roles of Joan Littlewood and Theatre Workshop in the Genesis and Production of Brendan Behan's ‘The Hostage’, at the National University of Ireland, Galway, June Favre wrote to Clive praising the article ‘Closing Joan's Book: Some Personal Footnotes’ (NTQ, May 2003). As a result of that first letter, Clive and June began a correspondence – exchanging questions, notes, published and unpublished material, with a final email to June dated 4 March 2005, less than two weeks before his death on 17 March. Clive had accepted the position of external examiner for the thesis with the viva voce to take place 10 May 2005 in Galway – a city Clive had never visited. An email sent on 21 February 2005 informed June that Clive was looking forward to ‘seeing the sun go down on Galway Bay’. His sudden death deprived him of that pleasure. Concluding the ‘Acknowledgments’ of the thesis, June wrote: ‘Above all my heartfelt gratitude for the dozens of emails, letters, and articles Clive Barker shared with me. He promptly supplied information on Joan Littlewood and the productions of Brendan Behan plays from first-hand experience.’ There follow some of the informative and humorous exchanges between Clive and June, who was awarded her doctoral degree later in 2005.

scholarly journals Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2788
Author(s):  
Zhongbei Tian ◽  
Ning Zhao ◽  
Stuart Hillmansen ◽  
Shuai Su ◽  
Chenglin Wen
Keyword(s):  
Power Supply ◽  
Normal Operation ◽  
Supply Network ◽  
Power Network ◽  
Power Load ◽  
Power Substation ◽  
Railway Traction ◽  
Train Operation ◽  
The Impact ◽  
Traction Power

The simulation of railway systems plays a key role in designing the traction power supply network, managing the train operation, and making changes to timetables. Various simulation technologies have been developed to study the railway traction power network and train operation independently. However, the interactions between the load performance, train operation, and fault conditions are not fully understood. This paper proposes a mathematical modeling method to simulate the railway traction power network with a consideration of a multi-train operation, driving controls, under-voltage traction, and substation fault modes. The network voltage, power load demands, and energy consumption according to the existing operation are studied. The hotspots of the power supply network are identified based on an evaluation of the train operation and power demand. The impact of traction power substation (TPSS) outage and a short circuit on the power supply network have been simulated and analyzed. The simulation results have been analyzed and compared with those of a normal operation. A case study based on a practical metro line in Singapore is developed to illustrate the power network evaluation performance.

Effect of Dry Ice Blasting on Removal of Loading Carbon Chips on Wheel Surface

2015 ◽  
Vol 656-657 ◽  
pp. 220-225 ◽  
Author(s):  
Kazuhito Ohashi ◽  
Soziro Murakawa ◽  
Shinya Tsukamoto
Keyword(s):  
Diamond Wheel ◽  
Working Environment ◽  
Wheel Surface ◽  
Dry Ice ◽  
Removal Method ◽  
Abrasive Grains ◽  
Grinding Performance ◽  
Dry Grinding ◽  
Dry Ice Blasting ◽  
The Impact

In dry grinding of hard carbon parts, the grinding performance of wheel is remarkably lost by carbon chips loading on wheel surface. The deterioration in grinding performance of wheel affects the grinding accuracy and efficiency. Generally, the grinding performance of loading wheel recovers by dressing. However, the dressing is not suitable from a viewpoint of the wheel life and the production cost because many abrasive grains having sharp edges under loading carbon chips on wheel surfaces are lost by dressing. In this study, we propose the application of dry ice blasting as a removal method of loading carbon chips. The dry ice is little influence on the working environment because of the quick sublimation of dry ice particles to carbon dioxide. In addition, the dry ice blasting might be suitable for the chip removal method because the dry ice doesn’t remain on wheel surfaces after blasting without the damage of wheel surfaces. The dry ice blasting tests of resinoid bond diamond wheel surface with no grinding performance by loading carbon chips are carried out, and the effects of dry ice blasting on removal of loading carbon chips are investigated, analyzing the protrusion height of abrasive grains, the impact pressure in the dry ice blasting and so on.

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