Experimental study on wear life of journal bearings in the rotor system subjected to torque

2020 ◽  
Vol 44 (2) ◽  
pp. 272-278
Author(s):  
Xinyu Pang ◽  
Xuanyi Xue ◽  
Xiaowu Jin
Keyword(s):  
Experimental Study ◽  
Journal Bearings ◽  
Rotor System ◽  
Test Results ◽  
Constant Torque ◽  
Wear Life ◽  
Comparison Results ◽  
Low Torque ◽  
The Impact ◽  
The Relationship

In the rotor system subjected to torque, the lubrication state of the journal bearings will change, which can lead to wear life change of such bearings. Therefore, the experimental study on the wear life prediction of the journal bearings in the rotor system subjected to torque was carried out. An improved Archard model for wear rate prediction was proposed, which can be applied to determine the relationship among speed, torque, and wear of different bearings. The 20 h wear of a single-span rotor system was tested at three speeds and torque. Test results show that the impact of torque on wear is greater than that of speed. The wear life of a bearing can be predicted with determined wear threshold. The 20 h wear was calculated by using the wear data of the rotor test bench in this model and compared with the actual wear. The comparison results indicate that the accuracy is higher than 92%. The torque – wear life curve shows that wear life is logarithmic to torque at a constant speed and significantly affected by changes in the low torque. Given a constant torque, the wear life will decrease logarithmically with the speed increasing.

Effects of CSR Messages on Apparel Consumers’ Word-of-Mouth: Perceived Corporate Hypocrisy as a Mediator

2021 ◽  
pp. 0887302X2110559
Author(s):  
Gargi Bhaduri ◽  
Sojin Jung ◽  
Jung E. Ha-Brookshire
Keyword(s):  
Experimental Study ◽  
Corporate Social Responsibility ◽  
Word Of Mouth ◽  
Corporate Sustainability ◽  
Negative Word ◽  
Injunctive Norm ◽  
The Difference ◽  
Corporate Social ◽  
The Impact ◽  
The Relationship

This study focused on understanding how (mis)match between a company's corporate social responsibility claims as indicated in their mission and the activities it actually undertakes to meet its CSR goals leads to consumers’ corporate hypocrisy and how consumers’ CSR-CA beliefs moderate the relationship between the two. Using the Moral Responsibility Theory of Corporate Sustainability as a framework, this research analyzed the difference in corporate hypocrisy between consumers with high versus low CSR-CA tradeoff beliefs. In addition, we examined the impact of consumers’ corporate hypocrisy on their negative word-of-mouth intention and how participants’ injunctive norm impacts the relationship between the two. A sample of 538 adult US consumers were recruited for an online experimental study. The study extends the findings of MCRS and also provides implications for apparel businesses.

scholarly journals Multispectral Contrast of Archaeological Features: A Quantitative Evaluation

2019 ◽  
Vol 11 (8) ◽  
pp. 913 ◽  
Author(s):  
Tuna Kalayci ◽  
Rosa Lasaponara ◽  
John Wainwright ◽  
Nicola Masini
Keyword(s):  
Quantitative Evaluation ◽  
Spectral Indices ◽  
Test Results ◽  
Precipitation Regime ◽  
Future Studies ◽  
Spectral Contrast ◽  
Simple Features ◽  
The Impact ◽  
The Relationship ◽  
Spectral Responses

This study provides an evaluation of spectral responses of hollow ways in Upper Mesopotamia. Hollow ways were used for the transportation of animals, carts, and other moving agents for centuries. The aim is to show how the success of spectral indices varies in describing topologically simple features even in a seemingly homogeneous geographic unit. The variation is further highlighted under the changing precipitation regime. The methodology begins with an exploration of the relationship between the date of a multispectral scene and the visibility of hollow ways. The next step is to evaluate the impact of rainfall levels on numerous indices and to quantify spectral contrast. The contrast between a hollow way and its background is evaluated with Welch’s t-test and the association between precipitation regime and spectral responses of hollow ways are investigated with Correspondence Analysis and Fisher’s test. Results highlight an intrinsic relationship between the precipitation regime and the ways in which archaeological features reflects and/or emits electromagnetic energy. Next, the categorization of spectral indices based on different rainfall levels can be used as a guidance in future studies. Finally, the study suggests contrast becomes an even more fruitful concept as one moves from the spatial domain to the spectral domain.

Experimental Study on the Transverse Stiffness of WJ-8 Rail Fastening

2014 ◽  
Vol 596 ◽  
pp. 3-6 ◽  
Author(s):  
Can Liu ◽  
Zhi Ping Zeng ◽  
Bin Wu ◽  
Jia Yu Yuan ◽  
Xian Feng He
Keyword(s):  
Experimental Study ◽  
Lateral Displacement ◽  
Horizontal Force ◽  
Test Results ◽  
Transverse Stiffness ◽  
Loading Device ◽  
The Relationship

The study of WJ-8 rail fastening is about the relationship between lateral horizontal force and rail’s lateral displacement, and the rail fastening’s transverse stiffness was obtained since the rail slipped. The rail lateral displacement was measured by using the loading device of rail’s lateral horizontal force which was changed as needed. Moreover, when the lateral horizontal force changes, it was analyzed that how it affected rail’s lateral displacement and rail fastening’s transverse stiffness under different bolt torque conditions. Therefore, the recommended value of transverse stiffness is acquired which is based on analyzing the test results.

Experimental Study on the Effect of Density of EPS Buffer Layer on the Cushioning Property of Motorcycle Helmet

2013 ◽  
Vol 455 ◽  
pp. 539-543
Author(s):  
Wei Cai Wen ◽  
Dong Ming Fu
Keyword(s):  
Experimental Study ◽  
Buffer Layer ◽  
Absorption Efficiency ◽  
Test Results ◽  
Effective Protection ◽  
Motorcycle Helmet ◽  
Energy Absorption Efficiency ◽  
Impact Experiment ◽  
The Impact ◽  
Buffer Structure

Build the model of motocross-style helmet with a dual - density and series-parallel EPS buffer layer and trial-produce helmet samples. Establish the impact experiment of the helmet model and obtain the values of HIC and Peak ACC based on the testing regulations of ECE R22.05. According to the analysis of the test results, the influence law of different EPS material densities to cushioning effect of the helmet was analyzed specifically. Experimental results show that the minimum values of HIC and Peak ACC can be obtained when the density of EPS is designed to be 0.06g/cm3; a dual - density and series - parallel EPS buffer layer has higher than 76 % of the energy absorption efficiency, and this buffer structure well reduces the values of HIC and Peak ACC, and provides effective protection for the head.

scholarly journals The Impact of Oil Prices on the Economy of Vietnam

2015 ◽  
Vol 22 (04) ◽  
pp. 142-159
Author(s):  
Hoa Nguyen Thi Lien ◽  
Trang Tran Thu ◽  
Giang Nguyen Le Ngan
Keyword(s):  
Industrial Production ◽  
Oil Prices ◽  
Test Results ◽  
Macroeconomic Performance ◽  
Price Shocks ◽  
Short Term ◽  
Correction Model ◽  
The Impact ◽  
The Relationship

In this paper we study the relationship between oil prices and macroeconomic performance by investigating the impact of oil price shocks on key macroeconomic variables of Vietnam over the 2001–2012 period. In order to test the relationship between oil prices and the value of industrial production, we use cointegration method to consider the long-term relationship and Error Correction Model (ECM) to ponder the short-term one. The test results show that the price of oil and the value of industrial production in Vietnam are positively correlated in the long term, whereas in the short term the volatility of oil prices in the last two months will negatively affect the fluctuation in the value of the current industrial production.

scholarly journals THE SAFETY AND SECURITY OF THE TOURISM ENTREPRENEURSHIP POTENTIAL REALIZATION IN MODERN CONDITIONS

2020 ◽  
Vol 6 (5) ◽  
pp. 203-208
Author(s):  
Iryna Mazur ◽  
Ramil Aliyev ◽  
Yuliia Zhelizko
Keyword(s):  
Regression Analysis ◽  
Safety Information ◽  
Security Threats ◽  
Test Results ◽  
Correlation And Regression Analysis ◽  
Tourist Flows ◽  
Political Security ◽  
High Level ◽  
The Impact ◽  
The Relationship

The purpose of the paper is to determine the relationship between different types of tourism safety and security, and components of the tourism entrepreneurship potential, to conduct a quantitative analysis of these indicators in the regions of Ukraine and to identify areas for ensuring the safety and security of the tourism entrepreneurship potential realization. Methodology. Analysis of tourism safety and security in Ukraine is based on the assessment of security potential indicator and the security threats indicator for 25 regions. These indicators take into account the following types of safety and security: security of tourist services, safety of tourist facilities and equipment, social security, political security, financial security, medical safety, information security, and ecological security. The impact of tourism safety and security on the tourism entrepreneurship potential realization is determined on the basis of correlation and regression analysis, where the indicator of the tourism entrepreneurship potential realization is the volume of domestic and inbound tourist flows in the region. The empirical basis of the study is the data of the State Statistics Service of Ukraine for 2019. The reliability of the regression model was tested on the basis of the approximation coefficient and Fisher's F-test. Results of the correlation analysis indicate a significant relationship between ensuring the safety and security of tourism in the region and the volume of domestic and inbound tourist flows. As a result of regression analysis, a model of a high level of reliability was obtained, which indicates how the volume of domestic and inbound tourist flows to the region increases with increasing the level of tourist safety and security by unit. Practical implications. Since the process of safety and security ensuring for the tourism entrepreneurship potential realization cannot be implemented exclusively at the regional level, it is justified the feasibility of a targeted public policy in eight areas. Value/originality. The identified relationship between the types of safety and security of tourism and components of the tourism entrepreneurship potential, as well as establishing the level of impact of safety and security of tourism on the tourism entrepreneurship potential realization in the region provide for a better understanding of ways for efficient governance in this area.

scholarly journals Relationship between Television Violence and Social Aggression a Study Conducted on Youth of Rural Areas of Punjab

2019 ◽  
Vol 03 (01) ◽  
Author(s):  
Muhammad Irfan Qadir ◽  
Professor Dr. Shafiq Jullandhry
Keyword(s):  
Rural Areas ◽  
Positive Relationship ◽  
Sampling Technique ◽  
Social Aggression ◽  
Test Results ◽  
Cross Sectional ◽  
The Social ◽  
Television Violence ◽  
The Impact ◽  
The Relationship

This study investigates the relationship between television violence and the social aggression of youth of rural areas of Punjab. This study is helpful to examine the exposure and attitude toward television violence of rural area youth of Punjab. This study also examined the impact of television violence on the social aggression of youth. Cross-sectional research design is used in this study and data was collected from the youth of the rural areas of nine divisions of Punjab. A total of 344 respondents were taken as sample size and a stratified sampling technique is used for data collection from the concerned population. The results of this study are generated through statistical software SPSS and Smart PLS. It was hypothesized that exposure toward television violence and the social aggression of youth have a positive relationship. The statistical test results show positive relationship among all hypotheses. So findings of the study help to conclude that exposure, attitude, and cognition toward television violence has an impact on the social aggression of youth of rural areas of Punjab.

A multi-group analysis of the effects of individual differences in mindfulness on nomophobia

2017 ◽  
Vol 35 (2) ◽  
pp. 333-341 ◽  
Author(s):  
Ibrahim Arpaci ◽  
Mustafa Baloğlu ◽  
Şahin Kesici
Keyword(s):  
Individual Differences ◽  
Group Analysis ◽  
Structural Models ◽  
Significant Negative Correlation ◽  
Test Results ◽  
Men And Women ◽  
Significant Difference ◽  
Mindful Attention Awareness Scale ◽  
The Impact ◽  
The Relationship

This study aimed to investigate the impact of individual differences in mindfulness on nomophobia. We developed and validated two structural models to identify the relationship between mindfulness and nomophobia. The ‘Nomophobia Questionnaire’ and the ‘Mindful Attention Awareness Scale’ were used to obtain data from the subjects. One-way MANOVA results suggested a statistically significant difference in nomophobia based on higher versus lower mindfulness. Further, a multi-group analysis was conducted to test the hypothesized relationships in the structural models for men and women. The results revealed that mindfulness had a significant negative correlation with nomophobia for both men and women. As scores in mindfulness increased, subjects exhibited less nomophobic tendencies. Further, those subjects who had lower scores in mindfulness showed higher anxiety when they were unable to communicate. However, subjects who scored higher in mindfulness showed lower anxiety when they could not access desired information. Independent sample t-test results were variant across men and women in nomophobia. Based on the findings we conclude that mindfulness based treatments can be beneficial in dealing with nomophobia for women.

The Impact of Rain Exposure During Loading of Wood Pellets for Ocean Shipment: An Experimental Study

2021 ◽  
Vol 64 (1) ◽  
pp. 253-258
Author(s):  
Jun Sian Lee ◽  
Shahab Sokhansanj ◽  
Anthony K. Lau ◽  
Jim Lim
Keyword(s):  
Experimental Study ◽  
List Type ◽  
Exploratory Research ◽  
Wood Pellets ◽  
Bulk Materials ◽  
The West ◽  
Rainfall Events ◽  
Fines Content ◽  
The Impact ◽  
The Relationship

HighlightsA cut-off curve was delineated that specifies the rainfall conditions at which loading of wood pellets must be stopped.The relationship between the amount of water sprayed and the pellet durability and fines content was quantified.Very light rainfall events (less than 0.5 mm h-1) had little impact on the durability of wood pellets.Abstract. On the west coast of Canada, port terminals are frequently exposed to seasonal rainfall events, which can impact the loading operations at the terminals. Wood pellets, one of the bulk materials frequently handled in Canadian ports, are known to disintegrate when exposed to water. However, the extent to which the exposed pellets degrade, in terms of their durability and fines content, is not quantified in the literature. This exploratory research quantifies the impact of liquid water on wood pellets and delineates a cut-off curve specifying the rainfall conditions at which the loading of wood pellets needs to be halted. For example, loading may continue for at least 30 min at rainfall intensities of less than 0.5 mm h-1 before the durability of the wood pellets drops from 99.5% to 96.5%. The results also showed that the durability and fines content of wetted pellets have a strong correlation with the amount of water that the wood pellets are exposed to. Keywords: Durability, Fines, Loading, Moisture content, Rain, Wood pellets.

The Impact of Consciousness Raising and Communicative Tasks on Fluency and Accuracy during Interaction within Saudi Secondary School Students

2020 ◽  
Vol 11 (5) ◽  
pp. 710
Author(s):  
Adnan Mukhrib
Keyword(s):  
Secondary School ◽  
Classroom Interaction ◽  
Task Type ◽  
Test Results ◽  
Language Performance ◽  
School Students ◽  
Consciousness Raising ◽  
Awareness Raising ◽  
The Impact ◽  
The Relationship

This study investigated the effect of collaborative tasks on language performance, with a focus on fluency and accuracy. Three groups of Saudi learners of English in a secondary school were given either awareness raising tasks, meaning-based activities or a combination. Quantitative data collected from 72 Saudi learners of English and then analysed to answer the research questions. The test results were analysed for speech fluency, written fluency, accuracy and lexical richness to provide quantitative measures of any improvement over the three test periods. Consideration was also given to language related episodes (LREs), i.e. pauses, repetitions and self-correction to identify changes during the interactions. The results indicated that there was an improvement in both fluency and accuracy. In addition, there is a likely significant benefit of encouraging interaction amongst peers during a task-based learning approach, particularly when there is a combination of CT and CR tasks, when compared to one task type. The findings underline the relationship between classroom interaction and practice and improvements in fluency and accuracy. This is important due to the increasing view that in the teaching of EFL, fluency is being neglected despite its importance in achieving communicative competence as Tavakoli and Hunter (2018) noted. As a result of the findings we argue that Saudi secondary school EFL classes should place a greater emphasis on TBL and interaction, combining both consciousness raising and communicative tasks to maximise the improved benefits seen in this study.

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