bluuebunny/crossref_metadata_2025_split huggingface dataset:
Theoretical analysis and experimental study on thermal stability of high-speed motorized spindle
Authors: Liu Zhe , Chen Wei , Li Desheng , Zhang Wenjing 
Published: October 2017

Purpose
In high-speed processing, the influence on the machining accuracy of a machine tool is greatly caused by the thermal deformation of the motorized spindle; a further study on the thermal characteristics of the spindle is given in this paper. This study aims to reduce the thermal error and improve the performance of the machine tool by discussing the relationships between the temperature distributions and rotating accuracy caused by the thermal deformations of the spindle.

Design/methodology/approach
The paper opted for a method combining the theoretical analysis and the experimental study to study the thermal stability of the high-speed motorized spindle. First of all, a finite element model of the spindle was built with ANSYS, whereby temperature distributions and the thermal deformations were successively obtained at different speeds. And then, both the temperature field and the rotating accuracy of the motorized spindle were measured simultaneously by the thermal stability experiment. Finally, the experimental and theoretical results were compared and validated.

Findings
The thermal stability of the motorized spindle was studied in this paper, and some findings from the study were as follows: the spindle’s rotating accuracy maintained good in X direction but bad in Y and Z directions in terms of the deformations; the higher front-end temperature of the spindle which can significantly affect the rotating accuracy is needed to be controlled mainly; the recovery speed of the spindle deformation lagged behind the temperature’s fallback speed; the vibration graph about radial rotating sensitivity synthesized by X1 and X2 presented a trifoliate shape.

Originality/value
Based on a built test-bed which can synchronously measure the motorized spindle’s temperature distribution and rotating accuracy with five-point method, the coupling effects of the thermal deformation and temperature are embodied, and not only the vibration graph but also the thermal tilt angles can be gained. Therefore, considering the influence of the thermal deformation on the heat generated by the bearings, the paper fulfilled a study by which it was obtained that the front-end temperature of the spindle, which was higher and could significantly affect the rotating accuracy, needed to be controlled mainly.
Effect of surface roughness and deformation on Rayleigh step bearing under thin film lubrication
Authors: Kumar Rahul , Azam Mohammad Sikandar , Ghosh Subrata Kumar , Khan Hasim 
Published: October 2017

Purpose
The aim of this paper is to study the effect of deterministic roughness and small elastic deformation of surface on flow rates, load capacity and coefficient of friction in Rayleigh step bearing under thin film lubrication.

Design/methodology/approach
Reynolds equation, pressure-density relationship, pressure-viscosity relationship and film thickness equation are discretized using finite difference method. Progressive mesh densification (PMD) method is applied to solve the related equations iteratively.

Findings
The nature and shape of roughness play a significant role in pressure generation. It has been observed that square roughness dominates the pressure generation for all values of minimum film thickness. Deformation more than 100 nm in bounding surfaces influences the film formation and pressure distribution greatly. Divergent shapes of film thickness in step zone causes a delay of pressure growth and reduces the load capacity with decreasing film thickness. The optimum value of film thickness ratio and step ratios have been found out for the maximum load capacity and minimum coefficient of friction, which are notably influenced by elastic deformation of the surface.

Practical implications
It is expected that these findings will help in analysing the performance parameters of a Rayleigh step bearing under thin film lubrication more accurately. It will also help the designers, researchers and manufacturers of bearings.

Originality/value
Most of the previous studies have been limited to sinusoidal roughness and thick film lubrication in Rayleigh step bearing. Effect of small surface deformation due to generated pressure in thin film lubrication is significant, as it influences the performance parameters of the bearing. Different wave forms such as triangular, sawtooth, sinusoidal and square formed during finishing operations behaves differently in pressure generation. The analysis of combined effect of roughness and small surface deformation has been performed under thin film lubrication for Rayleigh step bearing using PMD as improved methods for direct iterative approach.
Surface temperature and wear particle analysis of vertical motion double-nut ball screws
Authors: Horng Jeng-Haur , Chern Shin-Yuh , Li Chi-Lin , Chen Yang-Yuan 
Published: October 2017

Purpose
This paper aims to investigate the temperature and wear properties of vertical ball screws and to discuss the surface design of ball screws in industrial applications.

Design/methodology/approach
The energy equation of the screw surface considering the frictional heat was established to verify the surface temperature of the ball screw. X-ray diffraction was used to examine the micro-contact temperature between the ball and screw. Debris size and density were examined to investigate wear properties of ball screws and to study the relationship of wear debris and temperature.

Findings
First, the main energy source for the surface temperature of high speed vertical ball screws is derived from friction force between ball and screw. Second, the temperature rise between the ball and screw has great relevance with wear debris concentration. Third, the surface temperature of the screw is higher than between the nut and ball for high speed vertical ball screws due to high convection heat transfer. The contact temperature of the nut near the flange is smaller than that of the nut away from the flange end due to the high contact load and thermal conduction. Finally, correlation of particle size and surface roughness value for vertical ball screws was established, and its effects on contact temperature were studied. The theoretical analysis and experiments will help to characterize the design and manufacture of vertical ball screws.

Originality/value
The surface temperature and micro-contact temperature analytical model were established to study the ball screw design. Based on the surface-particle micro-contact temperature balance, the optimal range of surface roughness was designed for vertical ball screws, considering the wear debris and micro-contact temperature.
Wear behavior of micro-coined steel surfaces under mixed lubrication
Authors: Rosenkranz Andreas , Khan Saad Ahmed , Szurdak Adam , Hirt Gerhard , Gachot Carsten 
Published: October 2017

Purpose
The purpose of this study is to investigate the influence of hemispherical structures fabricated by hot micro-coining on the resulting wear performance. Hemispherical structures with different area densities (20 and 30 per cent), depths (50 and 100 µm) and diameters (100 and 200 µm) were fabricated by hot micro-coining on stainless steel samples.

Design/methodology/approach
The wear performance of these samples was studied using a ball-on-disk tribometer in rotational sliding mode using a normal load of 30 N and a fixed sliding velocity of 2 cm/s. Two different poly-(alpha)-olefin (PAO) oils without any additive having a kinematic viscosity of 4 and 40 cSt, were used to study the influence of the oil viscosity on the wear behavior.

Findings
Concerning the polished reference, an enlarged wear volume with an increase in the cycle number and the oil viscosity was observed. In the case of the micro-coined surfaces, all samples demonstrate a pronounced reduction in the wear volume (up to a factor of 100 for PAO 40) compared to the polished reference irrespective of the oil viscosity used.

Originality/value
This study details new research work studying the wear behavior of hot micro-coined surfaces.
A comparative study of the friction and wear performance of Fe-based bulk metallic glass under different conditions
Authors: Segu Dawit Zenebe , Hwang Pyung 
Published: October 2017

Purpose
This study aims to compare the friction and wear behaviors of Fe68.3C6.9Si2.5 B6.7P8.8Cr2.2Al2.1Mo2.5 bulk metallic glass (BMG) under sliding using dry, deionized water-lubricated and oil-lubricated conditions. The comparison was performed using a unidirectional ball-on-flat tribometer under different applied loads, and the results were compared to the properties of a conventional material, SUJ2. Fe-based BMG materials have recently been attracting a great deal of attention for prospective engineering applications.

Design/methodology/approach
As a part of the development of Fe-based BMGs that can be cost-effectively produced in large quantities, an Fe-based BMG Fe68.8C7.0Si3.5B5.0P9.6 Cr2.1Mo2.0Al2.0 with high glass forming ability was fabricated. In the present study, the friction and wear properties of Fe-based BMG has been comparatively evaluated under dry sliding, deionized water- and oil-lubricated conditions using a unidirectional ball-on-flat tribometer under different applied loads, and the results were compared to the properties of conventional material SUJ2.

Findings
The results show that the Fe-based BMG had better friction performance than the conventional material. Both the friction coefficient and wear mass loss increased with increasing load. The sliding wear mechanism of the BMG changed with the sliding conditions. Under dry sliding conditions, the wear scar of the Fe-based BMG was characterized by abrasive wear, plastic deformation, micro-cracks and peeling-off wear. Under water- and oil-lubricated conditions, the wear scar was mainly characterized by abrasive wear and micro-cutting.

Originality/value
In this investigation, the authors developed a new BMG alloy Fe68.8C7.0Si3.5B5.0P9.6Cr2.1Mo2.0Al2.0 to improve the friction and wear performance under dry sliding, deionized water- and oil- lubricated conditions.
Numerical study of surface dimple phenomenon by starvation in simple sliding contact
Authors: Cui Shun , Nishikawa Hiroshi , Wang Jing , Zou Qian 
Published: October 2017

Purpose
This study aims to use a thermal elastohydrodynamic lubrication (EHL) algorithm incorporating an Eyring flow model to solve a steady-state contact in simple sliding motion.

Design/methodology/approach
A theoretical model was used to investigate the effect of starvation on the surface dimple phenomenon by gradually reducing the thickness of the inlet oil layer.

Findings
The increase in the starvation degree reduces the dimple depth, film thickness, the pressure peak and the temperature rise. Under the severe starvation condition, the dimple is eliminated so that the EHL contact becomes partly parched. In elliptical results, for the same starvation parameters, the oil replenishment is stronger than that in circular contact.

Originality/value
This paper fulfils an exploration to study how the oil starvation influences the surface dimple phenomenon.
A study of the effect of social shopping deals on online reviews
Authors: Lee In 
Published: October 2017

Purpose
The purpose of this paper is to investigate social shopping deals and their impacts on review metrics at an online review site, Yelp and to compare the review metrics of the restaurant businesses and the health and wellness businesses to understand how social shopping deals affects them.

Design/methodology/approach
This study adopts a multiple regression model to analyse the effect of seven independent variables on the dependent variable, the growth rate of reviews which is a proxy of sales growth. This sample consisted of the review data of 134 merchants which offered social shopping deals at Groupon in 2011. The online review data of these merchants were collected in 2015 to analyse the relationship between the deals and the grow rate of the reviews.

Findings
For the restaurant businesses, there is a positive persuasive effect of Groupon customers’ review score on the growth rate of the reviews and consequently on the sale growth. For the health and wellness businesses, there are a positive persuasive effect of the regular customers’ review score on the growth rate of the reviews and a negative awareness effect of the number of Groupon reviews on the growth rate of the reviews. The review data also show that the Groupon customers of the health and wellness businesses are three times more likely to post their reviews than those of the restaurant businesses.

Research limitations/implications
First, while the author limited the study to the seven independent variables, additional variables may exist. These additional variables may also influence the number of reviews, too. Future research needs to identify such variables to build a comprehensive model. Second, future research needs to address other types of businesses, such as education and entertainment, and compare differences between them. Third, while the study focussed on the review score and the number of reviews, a more in-depth analysis of the comments using sentiment analysis and social network analysis may shed additional insights on their review activities.

Originality/value
Despite the potential significance of customers’ reviews about social shopping deals, the critical mass of empirical studies still lacks in this area. The study contributes to the literature of this field by investigating the effect of social shopping deals on the customers’ online reviews. This study provides practical guidance for the improvement of online reviews about social shopping deals.
An integrated social network mining for product-based technology analysis of Apple
Authors: Kim Juhwan , Jun Sunghae , Jang Dong-Sik , Park Sangsung 
Published: October 2017

Purpose
Patent contains vast information on developed technologies because of the patent system. So, it is important to analyze patent data for understanding technologies. Most previous studies on patent analysis were focused on the technology itself. Their research results lacked the consideration of products. But the patent analysis based on products is crucial for company because a company grows by sales of competitive products. The purpose of this paper is to propose a novel methodology of patent analysis for product-based technology. This study contributes to the product development strategy of a company.

Design/methodology/approach
The primary goal for developing technology is to release a new product. So it is important to analyze the technology based on the product. In this study, the authors analyze Apple’s technologies based in iPod, iPhone, and iPad. In addition, the authors propose a new methodology to analyze product-based technology. The authors call this an integrated social network mining (ISNM). In the ISNM, the authors carry out a social network analysis (SNA) according to each product of Apple, and integrate all SNA results of iPod, iPhone, and iPad using the technological keywords.

Findings
In this case study, the authors analyze Apple’s technologies according to Apple’s innovative products, such as the iPod, iPhone, and iPad. From the ISNM results of Apple’s technology, the authors can find which technological detail is more important in overall structure of Apple’s technologies.

Practical implications
This study contributes to the management of technology including new product development, technological innovation, and research and development planning. To know the technological relationship between whole technologies based on products can be the source of intensification of technological competitiveness.

Originality/value
Most of studies on technology analysis were focused on patent technology itself. Though one of their research goals was to develop new product, they had their limits considering the products because they did not use the technology information in the technology analysis. The originality of this research is to use the product information in technology analysis using the proposed ISNM.
Use contexts of personal computing devices: determinants of use context changes
Authors: Kim Jimin , Choi Goya , Chang Younghoon , Park Myeong-Cheol 
Published: October 2017

Purpose
The purpose of this paper is to investigate the use contexts of personal computing devices in multiple steps and conducts an in-depth analysis for the use context of smartphones. The determinants of use context changes of smartphones are investigated using the technology-to-performance chain model.

Design/methodology/approach
In steps 1 and 2, a diary study method and 2014-2015 Korea media panel research data provided by the Korea Information Society Development Institute are used. Correspondence analysis, χ2 independence tests, and standardized residual analyses were conducted. In step 3, this study develops and validates a framework for use context changes using a survey method and structural equation modeling.

Findings
The results show that the use context of personal computing devices is represented differently and is clearly defined depending on the device used. Furthermore, the use context of smartphones has changed significantly because of the rapid growth of smartphone users and diverse usage patterns of smartphones. The research model results show that users expand the scope and frequency of smartphone use when they experience improved performance in everyday tasks and feel that smartphone content and functions could support everyday tasks better.

Originality/value
This study presents novel early stage research and presents empirical evidence and propositions in both exploratory and confirmatory ways. The main contribution of this study is to provide guidelines and general implications for other empirical studies on the use contexts of devices or information technology services.
A methodology for enterprise systems post-implementation change management
Authors: Comuzzi Marco , Parhizkar Minou 
Published: October 2017

Purpose
Enterprise systems (ESs) are hard to maintain, since they embed a large fraction of organisational data and tasks, which are often intertwined and highly interdependent. The purpose of this paper is to propose a methodology for enterprise resource planning (ERP) post-implementation change management to support business analysts during perfective maintenance.

Design/methodology/approach
The methodology draws a parallel line with engineering change management and considers the steps of mapping the dependencies among ES components, understanding the ripple effects of change, and defining metrics to quantify and assess the impact of change. The methodology is instantiated in the case of ERP systems, for which a tool has also been implemented and evaluated by ERP implementation experts.

Findings
Experts positively evaluated the proposed methodology. General design principles to instantiate the methodology in the case of systems other than ERP have been derived.

Originality/value
While existing ESs change management methodologies help to identify the need for change, the proposed methodology help to structure the change process, supporting the task of perfective maintenance in an efficient way.
Consideration of future consequence and task performance
Authors: Lee Jihye , Yun Seokhwa , Kim Seckyoung Loretta 
Published: October 2017

Purpose
The purpose of this paper is to examine the effect of an employee’s consideration of future consequences (CFCs) in predicting employee task performance and its situational contexts (i.e. organizational support and supervisor support) based on trait activation theory.

Design/methodology/approach
Using a cross-sectional field study design, data were collected from 189 employees and their immediate supervisors in South Korea.

Findings
Hierarchical multiple regression analyses showed that employees’ CFC has a positive effect on their task performance. Furthermore, this study investigated whether this relationship would be varied by relevant situational factors. Consistent with the hypotheses, the relevance of CFC to employees’ task performance would be stronger when they perceive low levels of organizational support based on trait activation theory.

Practical implications
The findings suggest the importance of employees’ CFC on task performance. Also, organizations should pay more attention to the way of compensating for employees with low levels of CFC by fostering supportive environment.

Originality/value
Although researchers have been examined long-term perspectives in the business field, a few studies have examined its effect at the individual level. This paper identified not only the main effect of CFC on employee task performance but also the moderating role of organizational support on the aforementioned relationship.
Reciprocity and gift-giving logic in NPOs
Authors: Zollo Lamberto , Faldetta Guglielmo , Pellegrini Massimiliano Matteo , Ciappei Cristiano 
Published: October 2017

PurposeThe purpose of this paper is to investigate, through the lens of the gift-giving theory, volunteers’ motivations for intending to stay with organizations.Design/methodology/approachData were collected from 379 volunteers from 30 charitable organizations operating in Italy’s socio-healthcare service sector. Bootstrapped mediation analysis was used to test the hypothesized relationships.FindingsVolunteers’ reciprocal attitudes and gift-giving intentions partially mediated the relationship between motives and intentions to stay.Practical implicationsPolicy makers of charitable organizations are advised to be more responsive to behavioral signals revealing volunteers’ motivations, attitudes, and intentions. Managers should appropriately align organizational responsiveness with volunteers’ commitment through gift-giving exchange systems.Originality/valueThe findings reveal that reciprocity and gift giving are significant organizational variables greatly influencing volunteers’ intentions to stay with organizations. Signaling theory is used to explain how volunteers’ attitudes are linked with organizational responsiveness. Furthermore, this study is the first to use an Italian setting to consider motives, reciprocity, and gift giving as they relate to intentions to stay.
The beginning of value co-creation: understanding dynamics, efforts and betterment
Authors: Chen Tom , Ou Yang Shirley , Leo Cheryl 
Published: October 2017

Purpose
The purpose of this paper is to understand the beginning of value co-creation by uncovering the roles, efforts, and desired outcomes of employees and how they affect employees’ responses to their firm’s co-creation initiatives.

Design/methodology/approach
This study applies a single case study to explore micro-level processes at the beginning of value co-creation informed by a case about how a Taiwanese firm moved from a conventional to a co-creative business model.

Findings
The case study findings affirm nine subthemes that underlie three key themes: co-creation dynamics, efforts, and betterment. The authors provide a value co-creation framework that is informed by nine subthemes derived from interview data.

Research limitations/implications
Current literature on understanding value co-creation processes focuses on formalized co-creation processes which produce diverse and contextually dependent findings. The authors contribute to current value co-creation literature by offering convergent insights into the interplay of dynamics, efforts, and betterment experienced by employees transitioning to a value co-creation process.

Practical implications
The authors offer a diagnostic value co-creation checklist and propose three benefits of using the checklist, which can help managers mitigate the uncertainty that arises during the transition from a conventional to a co-creation firm.

Originality/value
The study responds to calls for research to investigate where and when the co-creation of value emerges, value co-creation behavior from employees’ point of view, and employees’ roles in the co-creation of value.