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The purpose of this paper is to set up a growth model for a world city, in order to determine the roles of government and enterprises. With the model, the authors of this paper want to test the efficiencies between governmental and enterprise investment for the experience of Beijing.

The paper proves the contributions of enterprise and governmental investment for a world city by three assumptions. It then sets up a growth model for a world city by taking the variable of governmental investment instead of the labor variable in the Solow Growth Model. With C‐D function, the paper sets up an empirical growth model of the world city of Beijing by ordinary least squares (OLS) regression.

Results of OLS show that the elasticity of enterprises operating surplus to world city growth is bigger than the one of governmental expenditure to world city growth, which indicates that the investment ability of the private sector has more efficient effectiveness on a world city than governmental investment. Meanwhile, technological progress also has weak effectiveness for world city growth from the regression of C‐D function.

When the public and private sectors were taken into account for world city growth, the role of government investment is constructing a fair environment for enterprises' competition and encouraging innovation in the private sector, as well as enhancing efficient policy for innovation application in the private sector.

The paper sets up a growth model with the variables of private and public factors taking the place of the variable of labor in the Solow Growth Model with government investment. The model can be adopted to explain the dynamics of world city growth in a transition economy.

The purpose of this paper is to provide the historical background of genealogical records and analyze the value of Chinese genealogical research through the study of names and genealogical resources.

The paper examines the historical evolution and value of Chinese genealogical records, with the focus on researching the Islamic Chinese names used by the people living in Guilin. The highlight of this paper includes the analysis and evolution of the Islamic Chinese names commonly adopted by the local people in Guilin. It concludes with the recommendations on emphasizing and making the best use of genealogical records to enhance the research value of Chinese overseas studies.

The paper covers the history of Islam and describes how the religion was introduced into China, as well as Muslims' ethnicity and identity. It also places focus on the importance of building a research collection in Asian history and Chinese genealogy.

This research study has a strong subject focus on Chinese genealogy, Asian history, and Islamic Chinese surnames. It is a narrow field that few researchers have delved into.

The results of this study will assist students, researchers, and the general public in tracing the origin of their surnames and developing their interest in the social and historical value of Chinese local history and genealogies.

The study of Chinese surnames is, by itself, a particular field for researching the social and political implications of contemporary Chinese society during the time the family members lived.

Very little research has been done in the area of Chinese local history and genealogy. The paper would be of value to researchers such as historians, sociologists, ethnologists and archaeologists, as well as students and anyone interested in researching a surname origin, its history and evolution.

The purpose of this study is to investigate the influence of dimple radius, depth and density on the lubrication performance of the plunger.

A lubrication model was adopted to consider eccentricity and deformation during the working process of the plunger, and a rig test was performed to confirm the simulation results. The texture was fabricated using laser surface texturing.

The simulation results suggested that when dimple radius or depth increases, oil film thickness of the plunger increases before decreasing, and asperity friction displays an opposite trend. Therefore, appropriate microdimple texture could facilitate lubrication performance improvement and reduce the wear. Microdimples were then lased on the plunger surface, and a basic tribological test was conducted to validate the simulation results. The experimental results suggested that the average friction coefficient decreased from 0.18 to 0.13, a reduction of 27.8%.

The introduction of microdimple on a plunger couple to reduce friction and improve lubrication is expected to provide a new approach to developing high-performance plunger couple and improve the performance of the internal combustion engine. If applied, the surface texture could help reduce friction by around 27% and cap the cost relative to the plugger friction.

The microdimple texture was introduced into the plunger couple of a vehicle to reduce the friction and improve the performance. Findings suggested that surface texture could be used in the automotive industry to improve oil efficiency and lubrication performance.

The peer review history for this article is available at: http://dx.doi.org/10.1108/ILT-07-2020-0259.