Yongzhen Lin, Ringo Nepp, Jim Gerschler and Matthias Kröger
The purpose of this study is asking for a methodologically representable relation between different relative velocity approaches, counter surfaces and the tribological behavior of…
Abstract
Purpose
The purpose of this study is asking for a methodologically representable relation between different relative velocity approaches, counter surfaces and the tribological behavior of the radial shaft seal (RSS).
Design/methodology/approach
The tribological behavior between the seal and the counterpart is examined experimentally to submit significant measured values. The correlations among seal elements, relative velocity approaches and counter surfaces with more aspects are searched.
Findings
A basis for future research regarding optimization options for service life extension of the RSS under different operation environments has been set. New insights for the performance of 3D-printed counter surface are gained as well as the application possibility of that is searched.
Originality/value
The applied measuring procedure in investigation part especially the usage of different approaches in relative velocity approaches is designed with originality. In particularly, the usage of a 3D-printed counter surface comes for the first time in a scientific work.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2022-0325/
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Bo Chen, Zheng Meng, Kai Yang, Yongzhen Yao, Caiwang Tan and Xiaoguo Song
The purpose of this paper is to predict and control the composition during laser additive manufacturing, since composition control is important for parts manufactured by laser…
Abstract
Purpose
The purpose of this paper is to predict and control the composition during laser additive manufacturing, since composition control is important for parts manufactured by laser additive manufacturing. Aluminum and steel functionally graded material (FGM) were manufactured by laser metal deposition, and the composition was analyzed by means of spectral analysis simultaneously.
Design/methodology/approach
The laser metal deposition process was carried out on a 5 mm thick 316L plate. Spectral line intensity ratio and plasma temperature were chosen as two main spectroscopic diagnosis parameters to predict the compositional variation. Single-trace single-layer experiments and single-trace multi-layer experiments were done, respectively, to test the feasibility of the spectral diagnosis method.
Findings
Experiment results showed that with the composition of metal powder changing from steel to aluminum, the spectral intensity ratio of the characteristic spectral line is proportional to the elemental content in the plasma. When the composition of deposition layers changed, the characteristic spectrum line intensity ratio changed obviously. And the linear chemical composition analysis results confirmed the gradient composition variation of the additive manufacturing parts. The results verified the feasibility of composition analysis based on spectral information in the laser additive manufacturing process.
Originality/value
The composition content of aluminum and steel FGM was diagnosed by spectral information during laser metal deposition, and the relationship between spectral intensity and composition was established.
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Kai Wang, Jiaying Liu, Shuai Yang, Jing Guo and Yongzhen Ke
This paper aims to automatically obtain the implant parameter from the CBCT images to improve the outcome of implant planning.
Abstract
Purpose
This paper aims to automatically obtain the implant parameter from the CBCT images to improve the outcome of implant planning.
Design/methodology/approach
This paper proposes automatic simulated dental implant positioning on CBCT images, which can significantly improve the efficiency of implant planning. The authors introduce the fusion point calculation method for the missing tooth's long axis and root axis based on the dental arch line used to obtain the optimal fusion position. In addition, the authors proposed a semi-interactive visualization method of implant parameters that be automatically simulated by the authors' method. If the plan does not meet the doctor's requirements, the final implant plan can be fine-tuned to achieve the optimal effect.
Findings
A series of experimental results show that the method proposed in this paper greatly improves the feasibility and accuracy of the implant planning scheme, and the visualization method of planting parameters improves the planning efficiency and the friendliness of system use.
Originality/value
The proposed method can be applied to dental implant planning software to improve the communication efficiency between doctors, patients and technicians.
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Jun Wu, Yingli Pan and Qi Zhu
– The purpose of this paper is to identify the determinants for currency internationalization and forecast the potential of RMB as an international reserve currency.
Abstract
Purpose
The purpose of this paper is to identify the determinants for currency internationalization and forecast the potential of RMB as an international reserve currency.
Design/methodology/approach
This paper performs linear or non-linear regressions of the shares of eight major international reserve currencies as the reserve assets in global central banks on the macro economic and financial variables of their corresponding countries to identify the determinants for their international positions, and conducts an “counter-factual simulation” for the potential of RMB as an international reserve currency.
Findings
This paper finds that the economic size and the “network externalities” are the most important determinants for the international status of a reserve currency; that exchange rate volatility has negative impacts; the conditions for the RMB internationalization are basically available. The simulation for the potential of RMB as an international reserve currency reveals that the international role of RMB could surpass that of the Japanese Yen and the British Pound, and get close to Euro in the coming 15 years. Based on the empirical evidence, this paper suggests a promoting strategy for RMB internationalization.
Research limitations/implications
This paper has not taken the influence of economic systemic and political factors on the process of RMB internationalization into account.
Practical implications
RMB internationalization promotion should follow the strategy of “stably create RMB international demand in the initial period and dramatically release the RMB overseas supply in the latter period” in the coming 15 years.
Originality/value
The conclusions and policy implications are from the results of the empirical analysis on the 45-year historical experience on the eight main international currencies.