scholarly journals Study of Bondura® Expanding PIN System – Combined Axial and Radial Locking System

2021 ◽  
Vol 67 (12) ◽  
pp. 625-634
Author(s):  
Muhammad Maaz Akhtar ◽  
Øyvind Karlsen ◽  
Hirpa G. Lemu
Keyword(s):  
Working Conditions ◽  
Surface Friction ◽  
Parallel Plates ◽  
Bolted Connections ◽  
Original Design ◽  
Applied Torque ◽  
Pros And Cons ◽  
Capability Improvement ◽  
Different Levels ◽  
Over Time

Bolted connections are widely used in parallel plates and flanged joints to axially lock using the preload generated by the tightening torque and to constrain radial movements of the flanges by the surface friction between mating surfaces. The surface friction depends on the micro-asperities of mating surfaces; under the influence of vibrations and other external radial loads, these asperities tend to deform over time, resulting in the failure of the connection. The Bondura expanding pin system presented in this article is an innovative axial and radial locking system, in which the failure of bolted connections due to radial movements is eliminated by relying on the mechanical strength of the pin system along with the surface friction. The present study describes an experimental design to verify the maximum possible preload on the axial-radial pin at different levels of applied torque. The article also provides a realistic comparison of the pin system with standard bolts in terms of handling axial and radial loads. With some alterations in the axial-radial pin system’s design, the joint’s capability to resist failure improved appreciably compared with the original design and standard bolts with higher preload. As a result, the estimated capability improvement of the joint against the connection failure due to the external radial load by the axial-radial pin is observed to be more than 200 % compared to standard bolts. Considering the pros and cons of both fasteners, i.e., axial-radial pin and standard bolts, a practical solution can be chosen in which both fasteners are used in a connection, and an optimized situation can be developed based on the working conditions.

The Analysis on the Tribological Properties of TPU/PVC Blends under Oil Lubrication

2013 ◽  
Vol 774-776 ◽  
pp. 94-98
Author(s):  
Dao Yuan Pan ◽  
Peng Peng Wu ◽  
Zhong Xue Gao ◽  
Yu Zeng Zhang
Keyword(s):  
Working Conditions ◽  
Friction And Wear ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Operation Conditions ◽  
Hydraulic Steering ◽  
Pros And Cons ◽  
Friction And Wear Properties ◽  
Lubrication Conditions ◽  
Better Than

Based on actual working conditions and parameters of the hydraulic steering gear, the purpose is optimizing the rubber seal of steering gear by different rubbers mixing technology. Compare the five kinds of rubber with metal of the friction characteristics in dynamic fit, it can obtain a performance excellent rubber real in the specific operation conditions. And then improve the overall service life of the steering gear. It is first prepared the same hardness TPU and PVC and blends that the ratio is 3:7, 5:5and7:3 in this article. The pros and cons of the five rubbers are analyzed in friction and wear properties of the above experimental. The test curve of coefficient friction and wear with time has been done under different load at constant low speed. It determines TPU/PVC = 3:7 blends through friction and wear and wear mechanism of five rubbers with steel comparatively analyses, and the heat resistance and wear resistance of them are better than the other TPU/PVC blends and PVC under oil lubrication conditions.

scholarly journals Evaluation of Methodology: Qualitative Studies about Mobile Technology Implementation in Education

2017 ◽  
Author(s):  
Arab World English Journal ◽  
Tsoghik Grigoryan
Keyword(s):  
Professional Development ◽  
Educational Technology ◽  
Mobile Technology ◽  
Technology Implementation ◽  
Qualitative Studies ◽  
Technology In Teaching ◽  
Language Classroom ◽  
Pros And Cons ◽  
Teachers Attitudes ◽  
Over Time

The description and understanding of the learning has changed significantly over time and is still in its transformational modern stage, which necessitates exploration and investigation of the pros and cons of innovative changes in the field of education. Some teachers resist those changes and do not feel comfortable teaching through or with mobile technology as they do not want to look incompetent when they are unable to troubleshoot. The purpose of this paper is to evaluate the methodology of qualitative studies conducted on the integration of mobile technology in language classroom and teachers’ attitudes towards using technology in teaching. The paper aims at examining 15 studies published in educational journals between 2006 and 2016. The articles discuss two aspects of educational technology: mobile technology integration in education and teachers’ attitudes and professional development for implementing technology in language classroom.

scholarly journals Potential of ontology for interoperability in e-government

2016 ◽  
Vol 10 (2) ◽  
Author(s):  
Edilson Ferneda ◽  
Fernando William Cruz ◽  
Hércules Antonio Do Prado ◽  
Renato da Veiga Guadagnin ◽  
Laurindo Campos Dos Santos ◽  
...  
Keyword(s):  
European Union ◽  
Electronic Government ◽  
Practical Solution ◽  
Semantic Level ◽  
Legal Question ◽  
Task Time ◽  
Efficient Mechanisms ◽  
Different Levels ◽  
Over Time ◽  
Legal Meaning

Interoperability is one of the fundamental requirements to enable electronic government. Its implementation can be classified into technical, syntactic, semantic, and organizational levels. At the semantic level, ontology is regarded as a practical solution to be considered. In this context, its adoption was identified in several countries, with different levels of maturity and so many focuses as the specific implementations. One of the main challenges to be overcome is the legal question that refers to the legislation to assure “the preservation of the legal meaning of data”. The lack of efficient mechanisms to support the deployment and use of ontologies can turn the overall task time-expensive, restricted in scope, or even unfeasible. Additionally, many initiatives are recent and need to be validated over time. This paper presents a non-exhaustive survey of the state of interoperability in e-government from the perspective of ontologies' use. The cases of Palestine, European Union, Netherlands, Estonia, and Brazil are discussed.

scholarly journals Learning Factories 4.0 in technical vocational schools: can they foster competence development?

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Michael Roll ◽  
Dirk Ifenthaler
Keyword(s):  
Learning Environments ◽  
Industry 4.0 ◽  
Positive Development ◽  
Vocational Schools ◽  
Vocational Students ◽  
Technical Competencies ◽  
Digital Competencies ◽  
Development Of Competencies ◽  
Different Levels ◽  
Over Time

AbstractLearning Factories 4.0 are thought to prepare vocational students for the challenges of Industry 4.0. The implementation of those interconnected Learning Factories 4.0 at technical vocational schools may promote the development of subject-related technical competencies as well as multidisciplinary digital competencies. Still, research is scarce with regard to the development of competencies supported through Learning Factories 4.0 in technical vocational schools. Hence this research focusses on subject-related technical and multidisciplinary digital competencies of technical vocational students change due to different levels of Learning Factory 4.0 interaction over time. Three subsequent competence tests with N = 63 technical vocational students were conducted. Findings indicate the benefits of integrating Learning Factories 4.0 for developing subject-related competencies in technical vocational schools. However, the study could not identify a positive development of multidisciplinary digital competencies. The findings of this study can help educators to further develop learning environments with support from Learning Factories 4.0 as well as preparing their learners for the demanding competencies of Industry 4.0.

Temperament and Coping Activity Under Stress of Changing Intensity Over Time

2012 ◽  
Vol 17 (4) ◽  
pp. 326-336 ◽  
Author(s):  
Irena Heszen
Keyword(s):  
Stress Intensity ◽  
Emotional Reactivity ◽  
Self Report ◽  
Sensory Sensitivity ◽  
And Coping ◽  
First Myocardial Infarction ◽  
Different Levels ◽  
Over Time

Temperament is probably an important factor that influences coping activity. The framework of the study was the Regulative Theory of Temperament by Strelau, where six temperamental traits are distinguished: emotional reactivity, perseveration, activity, briskness, sensory sensitivity, and endurance. These traits were hypothesized to be connected to coping activity in accordance with their psychological characteristics. It was also expected that the associations between temperament and coping activity should depend on stress intensity. Participants were 278 diabetics and 232 patients after first myocardial infarction (MI). The study was longitudinal and two diseases had been purposely selected so as to represent stress intensity either increasing (in diabetes) or decreasing (after MI) over time. Temperamental traits as well as coping activity components: cognitive appraisal, affect, and coping strategies were measured using self-report questionnaires. As hypothesized, temperamental traits were connected to coping activity. Phase-related changes in coping activity confirmed an increase in stress levels in diabetics, while cardiac patients tended to experience the situation as more challenging. While the expectation referring to the differential role of temperament under different levels of stress intensity was not confirmed, the connections of temperament with coping activity were found to decrease under long-term stress.

scholarly journals Land, investments and public-private partnerships: what happened to the Beira Agricultural Growth Corridor in Mozambique?

2018 ◽  
Vol 56 (1) ◽  
pp. 87-112 ◽  
Author(s):  
Randi Kaarhus
Keyword(s):  
Direct Investment ◽  
Agricultural Development ◽  
Capital Requirements ◽  
Commercial Agriculture ◽  
Market Strategy ◽  
Agricultural Growth ◽  
Land Grabs ◽  
Resource Dynamics ◽  
Different Levels ◽  
Over Time

AbstractInfluential discourses present Foreign Direct Investment (FDI) as essential for agricultural development in Africa; a parallel, critical debate on ‘land rushes’ has denounced Land Grabs, demanding increased accountability in FDI-based land deals. This article explores an initiative located in central Mozambique, the Beira Agricultural Growth Corridor (BAGC). It shows how the international fertiliser company Yara set out to enrol actors at different levels in business, governance and agricultural development into BAGC as a public-private partnership to promote commercial agriculture. Very soon, however, Yara made shifts in its engagement and market strategy, leaving the BAGC initiative to supporting donors and local producers. The analysis presented here shows how the tension between ‘patient-capital’ requirements, high risks and low immediate returns have shaped this case over time – in a context of a national political economy framed by extractive-resource dynamics.

Shared values, shared health, shared prosperity

2020 ◽  
pp. 83-98
Author(s):  
Davies and
Keyword(s):  
Public Health ◽  
Private Sector ◽  
Working Conditions ◽  
Shared Values ◽  
Complex Relationship ◽  
Health Security ◽  
The Past ◽  
Individual Family ◽  
The Relationship ◽  
Over Time

This chapter looks at the relationship between commerce and health, some of the choices involved, and the impacts they have on total health. Public health specialists and policymakers have only recently begun to explore the complex relationship between commerce and health, what it has been in the past, what it is now, and importantly what it could look like as we re-build society post COVID-19. The role that work and employers play in our individual, family, and collective health, security, and prosperity has developed over time, and the dependence of companies on the health of their workforce, and their vulnerability when employees are ill, has changed too. The private sector can contribute to health in its immediate community, and nationally through the products it promotes, the working conditions for its employees, and the causes it supports.

Ill health retirement

2019 ◽  
pp. 262-274
Author(s):  
Jon Poole ◽  
Glyn Evans
Keyword(s):  
Health Status ◽  
Working Conditions ◽  
Perceived Health ◽  
Perceived Health Status ◽  
Pension Schemes ◽  
The Uk ◽  
Over Time ◽  
Pensions Ombudsman

This chapter gives advice to doctors who provide reports for pension schemes about the merits of a patient’s application for ill health retirement. This is a challenging area of practice in which the structure and wording of the report is important if difficulties are to be reduced. An overview of pension provision in the UK is included as well as advice contained in determinations by the Pensions Ombudsman. Rates of ill health retirement for national schemes are shown against which doctors should audit their practice. In general, a retiree’s perceived health status tends to improve after retirement, although the improvement will attenuate over time. Heavy manual workers are more likely to retire on the grounds of ill health than non-manual workers, which has been attributed to their poorer health and less favourable working conditions.

scholarly journals The Influence of Different Levels of Cognitive Engagement on the Seated Postural Sway

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 601
Author(s):  
Daniele Bibbo ◽  
Silvia Conforto ◽  
Maurizio Schmid ◽  
Federica Battisti
Keyword(s):  
Working Conditions ◽  
Postural Sway ◽  
Center Of Pressure ◽  
Cognitive Engagement ◽  
Software Interface ◽  
Load Cells ◽  
Reliable Instrument ◽  
Seated Posture ◽  
Different Levels

In this paper, we introduced and tested a new system based on a sensorized seat, to evaluate the sitting dynamics and sway alterations caused by different cognitive engagement conditions. An office chair was equipped with load cells, and a digital and software interface was developed to extract the Center of Pressure (COP). A population of volunteers was recruited to evaluate alterations to their seated posture when undergoing a test specifically designed to increase the cognitive engagement and the level of stress. Relevant parameters of postural sway were extracted from the COP data, and significant alterations were found in all of them, highlighting the ability of the system to capture the emergence of a different dynamic behavior in postural control when increasing the complexity of the cognitive engagement. The presented system can thus be used as a valid and reliable instrument to monitor the postural patterns of subjects involved in tasks performed in a seated posture, and this may prove useful for a variety of applications, including those associated with improving the quality of working conditions.

scholarly journals A New Image Registration Algorithm Based on Evidential Reasoning

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1091 ◽  
Author(s):  
Zhe Zhang ◽  
Deqiang Han ◽  
Jean Dezert ◽  
Yi Yang
Keyword(s):  
Image Registration ◽  
Fundamental Problem ◽  
Similarity Measures ◽  
Detection Algorithms ◽  
Image Registration Algorithm ◽  
Theory Of Belief Functions ◽  
Pros And Cons ◽  
Registration Result ◽  
Different Levels ◽  
Selection Of

Image registration is a crucial and fundamental problem in image processing and computer vision, which aims to align two or more images of the same scene acquired from different views or at different times. In image registration, since different keypoints (e.g., corners) or similarity measures might lead to different registration results, the selection of keypoint detection algorithms or similarity measures would bring uncertainty. These different keypoint detectors or similarity measures have their own pros and cons and can be jointly used to expect a better registration result. In this paper, the uncertainty caused by the selection of keypoint detector or similarity measure is addressed using the theory of belief functions, and image information at different levels are jointly used to achieve a more accurate image registration. Experimental results and related analyses show that our proposed algorithm can achieve more precise image registration results compared to several prevailing algorithms.

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