Jiangping Yuan, Zhaohui Yu, Guangxue Chen, Ming Zhu and Yanfei Gao
The purpose of this paper is to study a feasible visualization of large-size three-dimension (3D) color models which are beyond the maximum print size of newest paper-based 3D…
Abstract
Purpose
The purpose of this paper is to study a feasible visualization of large-size three-dimension (3D) color models which are beyond the maximum print size of newest paper-based 3D printer used 3D cutting-bonding frame (3D-CBF) and evaluate the effects of cutting angle and layout method on printing time of designed models.
Design/methodology/approach
Sixteen models, including cuboid model, cylinder model, hole model and sphere model with different shape features, were divided into two symmetric parts and printed by the Mcor IRIS HD 3D printer. Before printing, two sub-parts were rearranged in one of three layout methods. Nine scaled sizes of original models were printed to find the quantitative relationship between printing time and scale values in each type. For the 0.3 times of original models, six cutting angles were evaluated in detail.
Findings
The correlation function about colorization time and printed pages was proposed. Based on 3D-CBF, the correlation between printing time and scale size is statistically defined. Optimization parameters of designed parts visualization about cutting angel and layout method were found, even if their statistical results were difficult to model their effects on printing time of specimens.
Research limitations/implications
The research is comparative and limited to the special models and used procedures.
Originality/value
The paper provides a feasible visualization and printing speed optimization methods for the further industrialization of 3D paper-based printing technology in cultural creative field.
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Yanhong Yan, Xiaocui Yan, Chengwen Yang, Yanfei Zhou, Zhining Jia and Caizhe Hao
The purpose of this study is to improve the dispersion of nanoserpentine modified with OA, KH550 and KH550/oleic acid in lubricating oil. The main aims are to analyze the…
Abstract
Purpose
The purpose of this study is to improve the dispersion of nanoserpentine modified with OA, KH550 and KH550/oleic acid in lubricating oil. The main aims are to analyze the influence of the dispersion and stability of nanoserpentine modified by different modifiers on the friction properties of lubricating oil.
Design/methodology/approach
The nanoserpentine particles obtained by ball-milling were modified by silane coupling agent KH550, OA and KH550/OA, respectively. The dispersity and stability of nanoserpentine in base lubricating oil were characterized by the absorbance value method, centrifuge precipitation rate method and static observation method. The MMU-5G screen display friction and wear tester was used to evaluate the tribological properties of C45E4/C45E4 friction pairs in corresponding lubricating oils. The surface morphology of the friction pairs was observed by scanning electron microscopy and energy dispersive spectroscopy.
Findings
The results showed that the dispersity and stability of nanoserpentine particles in lubricating oil were best modified by OA, followed by the KH550/OA and finally, the KH550. Nanoserpentine particles modified with oleic acid showed optimum tribological properties as lubricant additives.
Originality/value
This study can improve the dispersion stability of nanoserpentine particles in lubricating oil, increasing the antiwear and antifriction performance of lubricating oil, which has great significance in economic and military aspects.
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Yongxin Zhou, Qian Li, Zhiguo Xing, Renze Zhou, Zhenhua Huang, Yanfei Huang and Weiling Guo
This paper aims to investigate the effect of aluminum addition on the microstructure and mechanical properties of Mg-8Gd-4Y-1Zn alloy.
Abstract
Purpose
This paper aims to investigate the effect of aluminum addition on the microstructure and mechanical properties of Mg-8Gd-4Y-1Zn alloy.
Design/methodology/approach
Mg-8Gd-4Y-1Zn-xAl (x = 0, 0.5, 1.0, 1.5, 2.0 Wt.%) alloys were prepared by the conventional gravity casting technology, and then microstructures, phase composition and mechanical properties were investigated by material characterization method, systematically.
Findings
Results show that the as-cast microstructure of Mg-8Gd-4Y-1Zn alloy mainly consists of a-Mg matrix as well as Mg12REZn (18 R LPSO structure), and island-like Mg3(RE, Zn) phase is distributed at the grain boundary. The addition of a small amount of Al (0.5 Wt.%) can decrease the content of island-like Mg3(RE, Zn) phase, but significantly increase the content of long-period stacking ordered (LPSO) structure, resulting in the improvement of both tensile strength and elongation of Mg-8Gd-4Y-1Zn alloy. However, the addition of excessive Al will consume Re element and decrease the amount of LPSO structure, leading to the decrease of tensile properties. When the content of Al is 0.5 Wt.%, the tensile strength and elongation are 225 MPa and 9.0% of Mg-8Gd-4Y-1Zn alloy, which are 14% and 29% higher than that of Mg-8Gd-4Y-1Zn alloy, respectively.
Originality/value
Adding aluminum to Mg-8Gd-4Y-1Zn alloy strengthens its mechanical properties. And the effect of Al content on the alloy strengthening. The formation mechanism of LPSO structure with different aluminum content was revealed.
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Juan Tan, Yanfei Wang, Mouwu Liu and Jing Liu
The purpose of this paper is to study the tribological properties of a thiazole derivatives (T561), overbased alkyl benzene calcium sulfonate (T106A) compounded with T561 and…
Abstract
Purpose
The purpose of this paper is to study the tribological properties of a thiazole derivatives (T561), overbased alkyl benzene calcium sulfonate (T106A) compounded with T561 and overbased alkyl benzene magnesium sulfonate (T107) compounded with T561 in rapeseed oil (RSO).
Design/methodology/approach
A four-ball machine was used to evaluate the tribological properties of each compound and their combinations with T561 in RSO. Scanning electron microscopy, EDX and X-ray photoelectron spectroscopy were applied to analyze the tribofilm formed on the worn surfaces.
Findings
Results of tribotesting demonstrated that synergistic effects exist between the overbased sulfonates, T106A and T107, and the thiazole derivative, T561. The texts of tribofilm indicated that iron sulfide and iron oxides exist in T561 single agent lubricant film and two composite additives lubricant film, and no sulfates were detected. It suggested that the addition of alkyl benzene sulfonate did not hinder the formation of iron sulfides and iron oxides. Meanwhile, CaSO4 (MgSO4) and CaCO3 (MgCO3) were detected on the worn surface of the composite additives, which were not detected on the single agent friction surface.
Originality/value
A tribofilm mainly contains CaSO4 (MgSO4) and CaCO3 (MgCO3) formed on the worn surfaces, which is responsible for excellent extreme pressure and anti-wear properties of the compound agents because of their high melting point and high shear stress.
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Xueping Hu, Pengfei Tang, Yanfei Wang and Jing Liu
Water-based graphite lubricants have good lubricity in the process of metal forming, especially for hot-rolling seamless pipe. Although the use of water as a working fluid system…
Abstract
Purpose
Water-based graphite lubricants have good lubricity in the process of metal forming, especially for hot-rolling seamless pipe. Although the use of water as a working fluid system instead of conventional mineral oil has many advantages for the fuel consumption, post cleaning and a new type of lubricant, the graphite contaminated the machine and workers for its physical properties. From the global environmental protection viewpoint, it is urgent to develop a kind of benign material.
Design/methodology/approach
Magnesium hydroxide which has the average particle size of 10 μm was chosen as a base material without further modification and pretreatments. On the HT-1000 high-temperature tribometer, the influence of temperature and lubricant materials on the friction coefficient was studied. The tribological performance at 900°C provided evidence under high temperature for exploring a new lubricant material.
Findings
Tap water-based brucite lubricant will open a new chapter in the industrial lubrication, effectively avoiding many unfavorable factors caused by graphite lubrication, such as conductivity, pollution and energy loss. Meanwhile, it expanded the application of brucite as flame-retardant agent, catalyst, water treatment agent and so on.
Originality/value
It is a new and environmental lubricant to tap water-based brucite lubricant. And specially, the preparation process of lubricant is simple and economical.
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Abstract
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Daniel Eduardo Chavez and Haipeng (Allan) Chen
The purpose of this paper is to propose an overarching unifying theory where first-mover advantages are a conditional effect, not a main effect. By offering a closer look at how…
Abstract
Purpose
The purpose of this paper is to propose an overarching unifying theory where first-mover advantages are a conditional effect, not a main effect. By offering a closer look at how the firm, market and product characteristics influence the supply and demand of innovations, this research furthers our understanding of the advantages and disadvantages for first movers.
Design/methodology/approach
This paper explores first-mover advantages as a conditional effect. Adopting a contingency perspective, the authors review the literature in marketing, strategic management, innovation and entrepreneurship to offer a conceptual framework putting innovation success at the core of first-mover advantages. The authors develop an inventory of propositions specifying how first-mover advantages depend on various firm features, market characteristics and product properties through their effects on the success of innovations.
Findings
A conceptual framework centered around innovation success yields testable hypotheses that are coherent with extant research on first-mover advantages and reconcile the seemingly contradictory evidence in that body of work.
Practical implications
This research provides managers with the opportunity to think about one of the most important decisions, i.e. time of entry, not as a linear finite decision, but instead as a flow with the innovations and potential for their success in mind.
Originality/value
This paper distinguishes itself from the existing literature with its focus on innovation within a contingency perspective for first-mover advantages.
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Internet of Things (IoT) is an emerging paradigm that draws academia and industry attention in the past few years. The purpose of this paper is to review the current research on…
Abstract
Purpose
Internet of Things (IoT) is an emerging paradigm that draws academia and industry attention in the past few years. The purpose of this paper is to review the current research on IoT in library operation, and report the future trends and research challenges as well.
Design/methodology/approach
To conduct this research, the literature on IoT and its application in libraries was retrieved from major databases such as Web of Science, IEEE Xplore, Scopus and Inspec for the period between 2010 and 2018.
Findings
This study identifies IoT potential impact on libraries, and excavates some valuable literature on IoT and its application in libraries from managerial perspective, especially focuses on library service innovation in IoT era.
Originality/value
The IoT application in libraries is a new subject. This study provides an overview of IoT application in libraries. The findings of this study contribute to the research on IoT and its role in library management.
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Xiadi Li and Hanchuan Lin
Despite the importance of platform digitization capability to established firms, empirical research related to platform digitization capability, resource reconfiguration and…
Abstract
Purpose
Despite the importance of platform digitization capability to established firms, empirical research related to platform digitization capability, resource reconfiguration and organizational resilience remains scarce. Based on resource action view and contingency theory, this study constructs an integrated theoretical framework to examine the mediation effect of resource reconfiguration and the moderation effect of environmental munificence in the relationship between resource reconfiguration and organizational resilience.
Design/methodology/approach
Survey data comprising 312 valid responses are collected from manufacturing firms in China. Partial least squares equation modeling (PLS) was used in this study to test the hypotheses.
Findings
Results showed that platform digitization capability is positively related to organizational resilience. Resource recombination and resource reallocation mediate the platform digitization capability–organizational resilience relationship. Furthermore, environmental munificence significantly strengthens the relationship between resource recombination and organizational resilience while weakens the relationship between resource reallocation and organizational resilience.
Originality/value
This study reveals the path of platform digitization capability affecting organizational resilience, discusses the different role of resource recombination and resource reallocation and makes incremental contributions to resource action view. It also studies the impact of resource reconfiguration on organizational resilience under the condition of environmental munificence, which provides a new perspective for the study of organizational resilience and enriches the application of contingency theory in the crisis context.