Zhi Ding, Xinjiang Wei, Xiao Zhang and Xinsheng Yin
The shield tunnels closely constructed near the foundations have an inevitable influence on the structures, even results in the large settlement or uplift of the structures.
Abstract
Purpose
The shield tunnels closely constructed near the foundations have an inevitable influence on the structures, even results in the large settlement or uplift of the structures.
Design/methodology/approach
The comparison of structural deformation of three different foundations is presented based on the field monitoring data.
Findings
Shield tunnelling parameters vary for the different types of foundations. For the long pile foundations, the recommended speed is 3 to 4 cm/min, the grouting pressure is about 0.3 MPa and the grouting rate ranges from 150 to 180.
Originality/value
The study based on the field monitoring data is rarely reported, especially the topic about the structural deformation of different types of the foundations.
Details
Keywords
This paper aims to evaluate the dynamic response of surrounding foundation and study the vibration characteristics of track system.
Abstract
Purpose
This paper aims to evaluate the dynamic response of surrounding foundation and study the vibration characteristics of track system.
Design/methodology/approach
A double-line underground coupling analysis model was established, which included two moving train, track, liner and the ground field.
Findings
Based on the 2.5D (D is diameter) finite element analysis, the influence of the important factors such as the depth of the subway tunnel, the nature of the foundation soil, the relative position relation of the double tunnel, the subway driving speed on the foundation and the orbital vibration are analyzed in this article.
Originality/value
The results in paper may have reference value for the prediction of train induced vibrations and for the research of dynamic response of ground field.
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Zhi Ding, Xiao Zhang, Xinsheng Yin and Jiqing Jiang
This paper aims to analyse the effect of soft soil grouting on the deformation of the closed shield tunnel with the measured data.
Abstract
Purpose
This paper aims to analyse the effect of soft soil grouting on the deformation of the closed shield tunnel with the measured data.
Design/methodology/approach
Combining the measured data of vertical, horizontal and convergence deformation of the adjacent tunnel during the grouting construction in foundation pit engineering, the influence of grouting on metro tunnel in soft soil area is analyzed.
Findings
The researches indicate that early grouting has the main effect on the horizontal displacement of the tunnel; Due to the disturbing effect of the uninterrupted grouting construction on the soil and the transfer pressure of the rheological soil to the bottom of the tunnel, the tunnel is obviously lifted; And the convergence deformation of the tunnel increases caused by the overburden pressure in the vertical direction, so that the tunnel appears the phenomenon of staggered seam, large opening of bolted joint, damaged segment even leakage of water.
Originality/value
The study based on the field monitoring data is rarely reported, especially the topic about inadvertent grouting in soft soil area is likely to cause severe deformation of adjacent metro tunnel.
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Wei Quan, Bikun Chen and Fei Shu
The purpose of this paper is to present the landscape of the cash-per-publication reward policy in China and reveal its trend since the late 1990s.
Abstract
Purpose
The purpose of this paper is to present the landscape of the cash-per-publication reward policy in China and reveal its trend since the late 1990s.
Design/methodology/approach
This study is based on the analysis of 168 university documents regarding the cash-per-publication reward policy at 100 Chinese universities.
Findings
Chinese universities offer cash rewards from USD30 to USD165,000 for papers published in journals indexed by Web of Science, and the average reward amount has been increasing for the past ten years.
Originality/value
The cash-per-publication reward policy in China has never been systematically studied and investigated before except for in some case studies. This is the first paper that reveals the landscape of the cash-per-publication reward policy in China.
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The purpose of this paper is to investigate the inequality in career constructions among freshmen in an elite university in Shanghai, China. The authors first investigated whether…
Abstract
Purpose
The purpose of this paper is to investigate the inequality in career constructions among freshmen in an elite university in Shanghai, China. The authors first investigated whether rural students and those from municipalities (zhi xia shi) and provincial capitals differ in their career awareness when arriving at college. After finding the difference, the authors explored how this initial difference in career awareness evolves and influences the career construction process in the freshman year.
Design/methodology/approach
This study used a complementary mixed-methods approach to monitor a cohort of students’ career construction process and the evolvement of their career awareness throughout the freshman year (n=210). Data collection included two surveys: students’ self-reflections and in-depth interviews to capture a holistic story.
Findings
The findings revealed that students differed in career awareness when arriving at college. This initial difference further evolved in the first year of college: students from municipalities and provincial capitals considered college a part of their career paths and began timely to construct their careers, whereas students from rural areas lagged behind. This study suggests that college maintains inequality, reinforcing the initial gap in career construction based on students’ family background.
Originality/value
College students differ in career prospects and associated skills when transitioning from school to work. Only a few studies have explored the role of college in shaping the career construction process during the college years. By exploring the process of career construction among freshmen, this study contributes to the growing literature on school-to-work transition and educational inequality in China.
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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…
Abstract
Purpose
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.
Design/methodology/approach
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.
Findings
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.
Research limitations/implications
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.
Practical implications
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.
Social implications
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.
Originality/value
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.
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Cong Ding, Zhen-Yu Zhou, Zhi-Peng Yuan, Hua Zhu and Zhong-Yu Piao
The purpose of this paper is to study the correlation between the dynamic features of the running-in attractor and the wear particle group, so as to characterize the running-in…
Abstract
Purpose
The purpose of this paper is to study the correlation between the dynamic features of the running-in attractor and the wear particle group, so as to characterize the running-in attractor by means of the wear particle group.
Design/methodology/approach
Wear particles are collected in phased wear experiments, and their dynamic features are investigated by the equivalent mean chord length L. Then, the correlation between the equivalent mean chord length L and the correlation dimension D of the running-in attractor is studied.
Findings
In the wear process, the equivalent means chord length L first decreases, then remains steady, and finally increases, this process agrees with the increase, stabilization and decrease of the correlation dimension D. Therefore, the wear particle group has a dynamic nature, which characterizes the formation, stabilization, and disappearance of a running-in attractor. Consequently, the dynamic characteristics and evolution of a running-in attractor can be revealed by the wear particle group.
Originality/value
The intrinsic relationship between the wear particle group and the running-in attractor is proved, and this is advantageous for further revealing the dynamic features of the running-in attractor and identifying the wear states.
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Zhizhong Kang, Shixing Ding, Zhi-ang Shuai and Baomin Sun
This paper aims to shows the ability of the EDC model with a global reaction mechanism to describe reactions in the Eulerian simulation of a circulating fluidized bed (CFB).
Abstract
Purpose
This paper aims to shows the ability of the EDC model with a global reaction mechanism to describe reactions in the Eulerian simulation of a circulating fluidized bed (CFB).
Design/methodology/approach
The eddy dissipation concept (EDC) model is embedded in an Eulerian-Eulerian approach to simulate homogeneous reactions.
Findings
EDC_G is better than ED_FR in describing chemical reactions. The reaction of CH4 with O2 is faster than that of CO with O2, and NH3 is more liable to be converted than HCN. The combustion rate is higher than the Boudouard reaction rate of coal particles.N2O is mainly reduced by carbon, and NO is mainly converted by carbon into N2 and CO2.
Originality/value
The EDC model with a global reaction mechanism is embedded in a multi-fluid Eulerian approach to simulate the homogeneous reactions in the coal combustion in a CFB, including combustion of volatile gases, desulfurizing reactions and NOx reactions.
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Zhengwei Song, Zhi-Hui Xie, Lifeng Ding and Shengjian Zhang
This paper aims to comprehensively review the preparation methods of superhydrophobic surfaces (SHPS) for corrosion protection of Mg alloy in recent years.
Abstract
Purpose
This paper aims to comprehensively review the preparation methods of superhydrophobic surfaces (SHPS) for corrosion protection of Mg alloy in recent years.
Design/methodology/approach
The preparation methods, wettability and corrosion resistance of SHPS on Mg alloy in the past three years are systematically described in this paper.
Findings
Two types of SHPS, including single-layer and multilayer coatings for corrosion protection of Mg alloy are summarized. Preparing multilayered coatings with multifunction is the current trend in developing SHPS on Mg alloy.
Originality/value
This paper reviewed the preparation methods and corrosion resistance of SHPS on Mg alloys. It provides a valuable reference for researchers to develop highly durable SHPS with excellent corrosion resistance for Mg alloys.
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Abstract
Purpose
In recent decades, related party transactions have been assailed by scholars and regulation authorities since related parties of a listed company may “tunnel” its resources, damaging the interests of other stakeholders. One kind of “tunneling” is capital impropriation, which is common but harmful in an emerging market where investor protection is weak. In contrast, a listed company may also impropriate capitals from its controlling business group or related parties reported as accrued liabilities in the financial statement of the listed company, which can be regarded as the “supporting hand” from related parties. Thus, the capital impropriation may be bidirectional. In fact, the capital impropriation is a financing behavior with low cost, and it can provide necessary working capital for some firms and reduce that for the other. Since the working capital is an important part of the firm's stock of capital, which can relax firms' short‐run financing constraints, it may significantly influence firms' capital investment behaviors. Therefore, how does the bilateral capital impropriation influences the capital investment of listed firms?
Design/methodology/approach
Using the data of Chinese listed firms in 2005 and 2006, this paper empirically investigates the effect of bidirectional capital impropriation on listed firms' capital investment efficiency.
Findings
Receivable items like accounting receivable or other accruals that related parties owe to the listed firms will reduce the capital expenditure of listed companies and reduce the sensitivity of investment‐cash flow relation. Actually, capital impropriation by listed firms may stimulate their capital investments and increase the sensitivity of investment‐cash since listed firms obtain capitals for future investments at a lower cost. In all, the bidirectional capital impropriation significantly affects the capital investment and sensitivity of investment‐cash flow of listed firms, and different direction of capital impropriation will lead to different investment efficiency. It should also be noted that capital impropriation is not necessarily something negative since it may sometimes reduce the overinvestment.
Originality/value
The paper provides more evidence to the capital investment of listed companies and identifies the factors influencing its efficiency from the perspective of bidirectional capital impropriation.