A Tribute to George Lyons

Liew, Tat-siong Benny; Liew, Pamela K.

doi:10.2307/j.ctv138wrtq.4

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indicates that coefficient of friction decreases with the increase of normal load. Increased surface roughing and a large quantity of wear debris are believed to be responsible for the decrease of friction with the increase of normal load this concords with the finding of (Nikos Kournetas, 2003), (Sharma et al, 2009) and (Liew, W.Y.H;.…”

Section: Discussionsupporting

confidence: 78%

The Effect of Speed on Coefficient of Friction in African Plum Oil (<em>Dacryodes Edulis</em>) Lubricant

Nafu

Mofor

2022

AJET

View full text Add to dashboard Cite

One of the major factors influencing the variation of friction between surfaces in contact is the speed; we are faced here with the problem of determining the optimum speed between surfaces in contact in order to improve on the mechanical properties and performance of the entire system. This project investigates experimentally the effect of rotational speed on the (CoF) between aluminum disk test samples in contact with stainless steel pin using plum oil as a lubricant under thin film lubrication conditions. We first extracted plum oil using the manual pressing method and then carried out friction tests on a pin-on-disk tribometer as per ASTM-G 99 standards at room temperature. Rotational speeds between 500rpm and 3000rpm and normal loads of 10N and 20N were deployed as the operating variables and the variation of the (CoF) at predefined rotational speeds and normal loads was studied. Working time for each test was 20 minutes and each test was run twice and average value of friction force calculated. It was observed the CoF decreases with increasing rotational speed from 500rpm-1500rpm speed range and increases with increasing rotational speed from 1500rpm-2500rpm speed range while there is a slight drop from 2500rpm-3000rpm and an optimum speed range attained between 1250rpm-1500rpm where we experienced the least value of coefficient of friction for this specific material combination and test conditions. To further investigate other factors that affect the coefficient of friction and the validity of these results, more studies are needed.

show abstract

Section: Discussionsupporting

confidence: 78%

The Effect of Speed on Coefficient of Friction in African Plum Oil (<em>Dacryodes Edulis</em>) Lubricant

Nafu

Mofor

2022

AJET

View full text Add to dashboard Cite

show abstract

“…These communitybased prevalence levels were remarkedly lower than those reported in the local clinical settings [17]. Comparing with other Asian and Western countries [23][24][25][26], Hong Kong was shown to be at relatively high nocturia prevalence. It is agreed with the report amongst five Asian countries that Hong Kong was known to be the highest prevalent place for LUTS, where nocturia was dominated among elderly males [27].…”

Section: Discussionmentioning

confidence: 57%

A Comprehensive Community-Based Prevalence Study on Nocturia in Hong Kong Male Adults

Yuen¹,

Wong²,

Chiu³

et al. 2021

Preprint

View full text Add to dashboard Cite

Background: Most prevalence surveys on nocturia have focused on older populations. This study aimed to measure the nocturia prevalence across the full spectrum of male adults living in Hong Kong, where severity and associated quality-of-life (QoL) were also explored. Methods: A cross-sectional population-based survey was conducted in men aged 18 or above using the ICIQ-NQoL Questionnaire. Results: With 1,239 respondents at age ranged 18-99, the overall nocturia prevalence were found to be 63.0% (ranged 41.6-84.6% at different age groups) and 31.2% (ranged 13.0-56.3% at different age groups), for ≥1 and ≥2 bedtime voiding episodes, respectively. The chance of nocturia was dramatically increased at age 60 or above while both prevalence and voiding frequency were increased with advancing age. About 83% of the nocturia men experienced 1-2 voiding episodes per night, but many of them had self-rated their QoL poor or very poor and indicated moderate-to-high bothersome. Younger men at age 18-39 were found to have high prevalence as 41.6% and almost 30% of them rated poor or very poor QoL. Conclusions: Nocturia was not only affecting the older populations but also caused significant bothersome and negative impacts on QoL in younger males.

show abstract

A Tribute to George Lyons

Cited by 2 publications

References 0 publications

The Effect of Speed on Coefficient of Friction in African Plum Oil (<em>Dacryodes Edulis</em>) Lubricant

The Effect of Speed on Coefficient of Friction in African Plum Oil (<em>Dacryodes Edulis</em>) Lubricant

A Comprehensive Community-Based Prevalence Study on Nocturia in Hong Kong Male Adults

Contact Info

Product

Resources

About