How to measure the radial load of radial lip seals

2021 ◽  
Vol 68 (3-4) ◽  
pp. 5-12
Author(s):  
Simon Feldmeth ◽  
Mario Stoll ◽  
Frank Bauer
Keyword(s):  
Practice Guideline ◽  
Best Practice ◽  
Parameter Study ◽  
Radial Load ◽  
Measurement Device ◽  
Lip Seal ◽  
Study Results ◽  
Lip Seals ◽  
German Standard ◽  
The University

The radial load of a radial lip seal indicates how strongly the sealing lip is pressed on the shaft. The radial load significantly affects the function of the seal. The German standard DIN 3761-9 describes the measurement of the radial load according to the split-shaft method but leaves room for interpretation. During the revision of the standard, a parameter study was conducted at the University of Stuttgart. This study analyses the influence of the measurement device, the mandrels and the measuring procedure on the results. Based on the study results, recommendations are derived and summarized in a best-practice guideline, which should enable an appropriate and reproducible measurement of the radial load.

Elastohydrodynamic Analysis of the Sealing Performance of Rotary Shaft Helix Lip Seals—Part 1

1998 ◽  
Vol 120 (3) ◽  
pp. 476-481 ◽  
Author(s):  
Lou Liming ◽  
Kazutoshi Yamamoto ◽  
Ken Ikeuchi
Keyword(s):  
Analytical Method ◽  
Hydrodynamic Lubrication ◽  
Operating Conditions ◽  
Experimental Results ◽  
Radial Load ◽  
Pumping Rate ◽  
Lip Seal ◽  
Sealing Performance ◽  
Lip Seals

Based upon EHD theory, the sealing performance of a rotary shaft helix lip seal has been analyzed numerically using a complete hydrodynamic lubrication model. In order to verify the analytical method, several experiments are carried out under different operating conditions. After verification by the experimental results, the analytical method is used to calculate the sealing limit and the optimum seal radial load. The effects of the boundary pressure of sump side upon the pumping rate of a seal are discussed.

What Can We Learn From Trustworthy Data? An Interview With John Wills Lloyd

2020 ◽  
pp. 105345122096310
Author(s):  
Kristin L. Sayeski
Keyword(s):  
Learning Disabilities ◽  
Best Practice ◽  
Design Research ◽  
Single Case ◽  
Professional Organizations ◽  
Professor Emeritus ◽  
University Of Virginia ◽  
Single Case Design ◽  
Design Research Methodology ◽  
The University

John Wills Lloyd is Professor Emeritus at the University of Virginia and co-editor of Exceptional Children. He earned his PhD from the University of Oregon and spent most of his career at the University of Virginia. Dr. Lloyd has been an integral part of many professional organizations, including the Council for Exceptional Children’s Division for Learning Disabilities, where he served as president and later as the executive director, and the Division for Research. Dr. Lloyd’s work has focused on the identification of effective instructional practices, best-practice in single-case design research methodology, and facilitating a deeper understanding of learning disabilities. He has produced numerous scholarly articles, foundational textbooks, and web-based materials that continue to inform readers about effective practice in special education.

scholarly journals The Academic Freedom among the Students at the Hashemite University: الحرية الأكاديمية لدى طلبة الجامعة الهاشمية

2020 ◽  
Vol 4 (30) ◽  
Author(s):  
Abd AlKhaleq Muhammad Al-Zyoud
Keyword(s):  
Academic Freedom ◽  
Undergraduate Students ◽  
First Semester ◽  
Academic Level ◽  
Study Results ◽  
High Level ◽  
The University ◽  
Hashemite University ◽  
Senior Students ◽  
Academic Year

This study aimed at exploring the level of academic freedom at the Hashemite University in Jordan from the perspective of the undergraduate students, and whether there are impacts of the students’ gender, academic level, or specialization. The sample consisted of (376) undergraduate students (111 male, 265 female), who are registered at the university for the first semester of the academic year 2019/2020, from all faculties of the Hashemite University. The results showed that 25.5% of participants perceived a high level of academic freedom, 57.2% of participants perceived a moderate level, and 17.3% of them perceived a low level. Significant differences were found due to academic level; academic freedom perceived level among senior students was higher than all other years (freshmen, sophomores and juniors), but no significant differences were found due to students’ gender, or specialization. In light of the study results, the researcher recommends a number of recommendations such as: raising the awareness about the academic freedom among the students, faculty members, and the staff the Jordanian universities, conducting survey studies that measure the level of academic freedom among the students at various Jordanian universities, Supporting the academic freedom of the students at the institutions of higher education through deliberate and planned initiatives.

scholarly journals Relationship Between Teachers Leadership Styles and Students Academic Achievement

2019 ◽  
Vol IV (IV) ◽  
pp. 360-366
Author(s):  
Abdur Rashid ◽  
Roohul Amin ◽  
Shabir Ahmad
Keyword(s):  
Academic Achievement ◽  
Academic Success ◽  
Leadership Styles ◽  
Teacher Leadership ◽  
School Effectiveness ◽  
Pearson Correlation ◽  
Study Results ◽  
Study Population ◽  
The University ◽  
The Relationship

Leadership styles play an important role and position in pedagogical activities and school effectiveness because they play a major role in the learning process. The current study looked at the relationship between teacher leadership styles (including democratic, autocratic, transformational and transactional) and student academic achievement at the university level. Head of the Departments of Social Sciences and Master degree students made up the study population. Twenty-nine Heads of Departments (HODs) and two hundred and six students from five public sector universities in Khyber Pakhtukhawa were selected through simple random and stratified (proportionate) sampling techniques. Data was collected through a questionnaire, the reliability co-efficient of which was 0.72 and 0.82 for HODs and students respectively. The data collected was analyzed using Mean, Standard Deviation and Pearson Correlation. The study results indicate that teacher leadership styles are strongly linked to student academic success

scholarly journals Organising to beat the Trade Union Act (2016) voting thresholds: a case study of organising and tactics from the University and College Union

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
James Richards ◽  
Vaughan Ellis
Keyword(s):  
Trade Union ◽  
Trade Unions ◽  
Best Practice ◽  
Content Type ◽  
Theoretical Contribution ◽  
Proposed Model ◽  
College Union ◽  
The University ◽  
Further Development

PurposeA retrospective action-research case study of one branch of the University and College Union (UCU) is used to show how threshold requirements of the Act can be systematically beaten.Design/methodology/approachThe paper responds to calls for “best practice” on how trade unions may react to member voting threshold requirements of the Trade Union Act 2016 (the Act). A broader aim is to make a theoretical contribution related to trade union organising and tactics in “get the vote out” (GTVO) industrial action organising campaigns.FindingsFindings are presented as a lead organiser's first-hand account of a successful GTVO campaign contextualised in relation to theories of organising. The findings offer “best practice” for union organisers required to beat the Act's voting thresholds and also contribute to theories surrounding trade union organising tactics.Research limitations/implicationsFurther development and adaptation of the proposed model may be required when applied to larger bargaining units and different organising contexts.Practical implicationsThe findings can inform the organising practices/tactics of trade unions in relation to statutory ballots. The findings also allow Human Resource (HR) practitioners to reflect on their approach to dealing with unions capable of mounting successful GTVO campaigns.Social implicationsThe findings have the potential to collectively empower workers, via their trade unions, to defend and further their interests in a post-financial crisis context and in the shadow of the Covid-19 pandemic.Originality/valueThis is the first known empirical account of organising to exceed voting thresholds of the Act, providing practical steps for union organisers in planning for statutory ballots. Further value lies in the paper's use of a novel first-hand account of a GTVO campaign, offering a new and first, theoretical model of organising tactics to beat the Act.

scholarly journals Upaya Perpustakaan Perguruan Tinggi Dalam Menciptakan Ruang Publik : Kajian “Wifi Zone Corner” Di Perpustakaan ITS

Pustakaloka ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 23
Author(s):  
Astutik Nur Qomariyah ◽  
Lailatur Rahmi
Keyword(s):  
Public Sphere ◽  
Routine Activities ◽  
Qualitative Approach ◽  
Public Forum ◽  
University Library ◽  
Study Results ◽  
The University ◽  
Descriptive Method

This study intends to identify and analyze the efforts of the university  library to create a public sphere. The study location is Wifi Zone Corner at ITS (Institut Teknologi Sepuluh Nopember) Library. This study used qualitative approach with descriptive method. The study results shows that the ITS Library has made efforts to create Wifi Zone Corner as a public sphere: (1) change the Wifi Zone Corner design into a public sphere become accessible, comfortable and without any binding rules; (2) held routine and non-routine activities with the concept of a public forum; and (3) make cooperation with some other institutions.

scholarly journals Master of public health practicum: Global trends and current practices.

2020 ◽  
Author(s):  
Hannah Gummeson ◽  
Sonika Raj Goel ◽  
Khalifa Elmusharaf
Keyword(s):  
Public Health ◽  
Health Education ◽  
Experiential Learning ◽  
Best Practices ◽  
Best Practice ◽  
Public Health Education ◽  
Health Programs ◽  
Public Health Programs ◽  
Master Of Public Health ◽  
Study Results

Abstract Background The field of graduate public health (GPH) education currently lacks clear, universal criteria for the integration of practice-based elements into the curriculum. The concept of the ‘practicum’ is well endorsed and there is a growing recognition that experiential learning is a crucial aspect of career development for the next generation of public health professionals, benefiting not only students, but also the profession and communities it serves. However, many leading academic institutions continue to emphasize research over experiential learning in public health, making practicums much less commonplace in education centers across the globe. Methods The purpose of this research was to review global best practices in graduate public health program design in order to identify commonalities and use the findings to inform practicum development.Data collection for this research was entirely web-based. Practicum guidelines from a globally diverse sample of graduate public health programs were reviewed. Data was compiled from universities’ websites and available online sources and collated into an Excel file. Descriptive statistics were computed for each study variable.Results We screened 108 graduate public health programs and 35 eligible programs were included in the study. Results were reported according to prerequisites & practicum scheduling, practicum contact hours & duration, credit hours & overall credit weighting, competencies, supervision, written agreement, objectives & deliverables, and approach to assessment. This research resulted in 13 recommendations intended to guide graduate public health practicum design. Based on the analysis of current best practice, the recommendations address the following four key domains: practicum design, mentorship & supervision, learning outcomes and evaluation. Conclusions This research demonstrates a global recognition of the benefit of practice experience in graduate public health education. However, the integration of practical components into curricula is inconsistent when viewed through a global lens. There is also significant variation in the structure of existing practical components. We propose that this study be utilized as a tool spark a global dialogue about best practices in graduate public health education through the identification common practices and opportunities for improvement.

Formation of Lubricant Film in Rotary Sealing Contacts: Part II—A New Measuring Principle for Lubricant Film Thickness

1992 ◽  
Vol 114 (2) ◽  
pp. 290-296 ◽  
Author(s):  
G. Poll ◽  
A. Gabelli
Keyword(s):  
Film Thickness ◽  
Elastohydrodynamic Lubrication ◽  
Lubricant Film ◽  
Lip Seal ◽  
Tribological System ◽  
Lip Seals ◽  
Magnetite Particles ◽  
Rotary Speed ◽  
Fluid Film Thickness ◽  
Insight Into

The development of models for the elastohydrodynamic lubrication of rotary lip seals requires the measurement of the film thickness under a real seal. A new method has been developed for this purpose which is based on the use of lubricant oils in which magnetite particles are suspended (so-called magnetic fluids). A change in the fluid film thickness will create a change in the impedance of the coil of the measuring circuit, the magnetic flux of which is directed through the oil film of the contact area. The advantage of this technique is that minimal modifications have to be applied to the tribological system under examination. Initial measurements carried out with a model rubber lip seal provided new insight into the build-up of a lubricant film as a function of the rotary speed and allowed comparison with the results of a theoretical model for the analysis of lip seal lubrication developed in parallel.

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