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Book part
Publication date: 28 May 2012

Weijie Wang

The chapter examines various manifestations of the concept of “social capital” in details by sorting them into three categories: individual, collective, and hybrid. Based…

Abstract

The chapter examines various manifestations of the concept of “social capital” in details by sorting them into three categories: individual, collective, and hybrid. Based on the examination of social capital literature, the chapter defines social capital as moral resources that lubricate cooperation among individuals for economic as well as civic reasons. Then the chapter examines social capital in contemporary urban China. The atomizing effect of market economy destroyed previous stock of social capital, but there are not corrective mechanisms to generate new social capital. Therefore urban China is experiencing the paucity of social capital.

Details

Living on the Boundaries: Urban Marginality in National and International Contexts
Type: Book
ISBN: 978-1-78052-032-2

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Book part
Publication date: 28 May 2012

Abstract

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Living on the Boundaries: Urban Marginality in National and International Contexts
Type: Book
ISBN: 978-1-78052-032-2

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Book part
Publication date: 28 May 2012

Living on the Boundaries: Urban Marginality in National and International Contexts examines the complex, often controversial issues impacting those who live on the margins…

Abstract

Living on the Boundaries: Urban Marginality in National and International Contexts examines the complex, often controversial issues impacting those who live on the margins of society in our densely populated cities. The topic warrants research compiled by an international array of scholars and intellectuals from a wide range of disciplines, including but not limited to sociology, economics, political science, psychology, education, public health, law, criminology, history, urban studies, geography and demography, and urban planning, among others. This volume, from the first chapter to the last, richly details and informs us about the human condition, from multidisciplinary perspectives, about urban life in global contexts. Why is the study of urban life and urban marginality so consequential? The answer is simple. Because of the unprecedented pace of urbanization, a majority of humans now live in highly dense areas, in our cities. It is our cities which project the visual imagery of the stark class divisions in society. By 2050, it is projected that two thirds of the world's population will live in cities. Any volume which attempts to present dynamic issues in global contexts moves us toward resolving many of the conflicting and confounding issues which plague humankind, in the present, and will be with us in the future, if workable solutions are not found. As one reads the ensuing pages, you cannot help but come away better informed, noting the symmetry of complex societal issues of urban marginality across national boundaries.

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Living on the Boundaries: Urban Marginality in National and International Contexts
Type: Book
ISBN: 978-1-78052-032-2

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Article
Publication date: 12 November 2018

Shuaishuai Zhu, Baosen Zhang, Zhixin Ba, Xiangyang Mao, Weijie Fei and Zhangzhong Wang

This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant.

Abstract

Purpose

This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant.

Design/methodology/approach

The Cr-Ni-Mo-V steel specimens were taken from a forged steel brake disc with the process of quenching at 900°C and tempering at 600°C. The tribological testing was performed using a contact configuration of ball-on-flat with a liquid cell according to the ASTM standard. Detailed examinations on the worn surface were analyzed using a scanning electron microscope.

Findings

The results indicate that the friction coefficient and friction damage of the steel sliding under water–silica mixture are higher than those under water. The friction coefficient decreases with increasing load and increases with the sliding speed for the two lubricants. The mass wear rate presents a rising trend with both sliding load and speed. The wear mechanisms of the Cr-Ni-Mo-V steel sliding under the two lubricants are oxidation wear, abrasive wear and fatigue wear.

Research limitations/implications

Because of the chosen tribological testing approach, the research results could not describe the tribological performance of the brake disc accurately during actual braking process of the high-speed train. Therefore, researchers are encouraged to test the proposed propositions further.

Originality/value

This study shows that the tribology behavior of the Cr-Ni-Mo-V steel with water or water–silica mixture lubrications helps the industrial firms and academicians to work on the wear of the brake disc in rainwater or wet environment.

Details

Industrial Lubrication and Tribology, vol. 70 no. 8
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 8 July 2019

Biao Zhao, Wenfeng Ding, Weijie Kuang and Yucan Fu

This paper aims to evaluate the influence of molybdenum disulfide (MoS2) concentrations (5, 7.5, 10, 12.5 and 15 Wt.%) on the microstructure and tribological property of…

Abstract

Purpose

This paper aims to evaluate the influence of molybdenum disulfide (MoS2) concentrations (5, 7.5, 10, 12.5 and 15 Wt.%) on the microstructure and tribological property of the self-lubrication cubic boron nitride (CBN) abrasive composites.

Design/methodology/approach

Three point bending method and rotating sliding test are used to evaluate the flexural strength and tribological property of self-lubricating CBN abrasive composites. Microstructure, wear morphology of the ball and scratch are supported by scanning electron microscopy, optical microscope and three-dimensional confocal microscopy, etc.

Findings

The MoS2 concentration has a significant influence on the interface microstructure between CBN abrasives and matrix alloys, and thus, affects the flexural strength of CBN abrasive composites. The grain fracture modes of CBN abrasive composites are transformed from the transgranular fracture into intergranular fracture as the MoS2 concentrations increase. Additionally, the friction coefficient of as-sintered samples decreases with the MoS2 concentrations. The MoS2 concentrations of 10 Wt.% are final determined to fabricate self-lubricating composites in basis of the mechanical and lubricating property.

Originality/value

The ball is fabricated under vacuum sintering process. The tribological property of self-lubricating CBN abrasive composites is evaluated in terms of the friction coefficient and morphologies of the ball and scratches after rotating sliding tests.

Details

Industrial Lubrication and Tribology, vol. 71 no. 5
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 22 October 2020

Hongyan Sheng, Taiwen Feng, Lucheng Chen, Dianhui Chu and Weijie Zhang

The purpose of this study aims to develop and test a motives-mass customization (MC) capability-performance model by dividing MC capability into product-oriented MC…

Abstract

Purpose

The purpose of this study aims to develop and test a motives-mass customization (MC) capability-performance model by dividing MC capability into product-oriented MC capability and service-oriented MC capability.

Design/methodology/approach

This research tests the hypothesized relationships using survey data from 277 Chinese manufacturing firms.

Findings

The results indicate that instrumental, relational and moral motives all have significantly positive impacts on product-oriented and service-oriented MC capability. The authors also find that product-oriented MC capability partially mediates the impacts of relational and moral motives on operational, environmental and economic performance, while service-oriented MC capability partially mediates the impacts of instrumental, relational and moral motives on operational, market, environmental and economic performance.

Originality/value

This study complements the existing MC literature by describing MC capability into two dimensions: product-oriented MC capability and service-oriented MC capability.

Details

Journal of Manufacturing Technology Management, vol. 32 no. 2
Type: Research Article
ISSN: 1741-038X

Keywords

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Article
Publication date: 13 January 2012

Weiguo Bian, Dichen Li, Qin Lian, Xiang Li, Weijie Zhang, Kunzheng Wang and Zhongmin Jin

The purpose of this paper is to fabricate and characterize osteochondral beta‐tricalcium phosphate/collagen scaffold with bio‐inspired design by ceramic stereolithography…

Abstract

Purpose

The purpose of this paper is to fabricate and characterize osteochondral beta‐tricalcium phosphate/collagen scaffold with bio‐inspired design by ceramic stereolithography (CSL) and gel casting.

Design/methodology/approach

Histological analysis was applied to explore the morphological characteristics of the transitional structure between the bone and the cartilage. The acquired data were used to design biomimetic biphasic scaffolds, which include the bone phase, cartilage phase, and their transitional structure. The engineered scaffolds were fabricated from β‐TCP‐collagen by CSL and gel casting. The cartilage phase was added to the ceramic phase by gel‐casting and freeze drying.

Findings

The resulting ceramic scaffolds were composed of a bone phase with the following properties: 700‐900 μm pore size, 200‐500 μm interconnected pores size, 50‐65 percent porosity, fully interconnected, ∼12 Mpa compressive strength. A suitable binding force between cartilage phase and ceramic phase was achieved by physical locking that was created by the biomimetic transitional structure. Cellular evaluation showed satisfactory results.

Research limitations/implications

This study is the first try to apply CSL to fabricate biological implants with β‐TCP and type‐I collagen. There are still some defects in the composition of the slurry and the fabrication process.

Practical implications

This strategy of osteochondral scaffold fabrication can be implemented to construct an osteochondral complex that is similar to native tissue.

Originality/value

The CSL technique is highly accurate, as well as biologically secure, when fabricating ceramic tissue engineering scaffolds and may be a promising method to construct hard tissue with delicate structures. The present strategy enhances the versatility of scaffold fabrication by RP.

Details

Rapid Prototyping Journal, vol. 18 no. 1
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 26 September 2008

Ling Wang, Jian Chu and Weijie Mao

The purpose of this paper is to develop a condition‐based replacement and spare provisioning policy for deteriorating systems with a number of identical units.

Abstract

Purpose

The purpose of this paper is to develop a condition‐based replacement and spare provisioning policy for deteriorating systems with a number of identical units.

Design/methodology/approach

The deterioration of units is modeled based on discrete‐time Markov chains, which can be classified into one of a finite number of states. Then, a condition‐based replacement and spare provisioning policy is proposed for deteriorating systems with a number of identical units. This policy combines the condition‐based replacement policy and the (S, s) type inventory policy, where S is the maximum stock level and s is the reorder level. The Monte Carlo approach is utilized for evaluating the average cost rate of the system under the proposed policy. Finally, numerical examples are given to illustrate the performance of the proposed policy, as well as the sensitivity analysis of cost parameters.

Findings

The negative influences of increasing the lead time can be reduced by optimizing the decisions of condition‐based replacement and spare order based on the proposed policy.

Practical implications

This policy would be applicable for jointly optimizing the spare provisioning decisions and the condition‐based maintenance of the units in deteriorating systems (e.g. a group of identical motors included in a fleet of vehicles).

Originality/value

The paper considers simultaneously two aspects that influence condition‐based maintenance decisions: the availability of spares and the deterioration state of units.

Details

Journal of Quality in Maintenance Engineering, vol. 14 no. 4
Type: Research Article
ISSN: 1355-2511

Keywords

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Article
Publication date: 11 April 2020

ZiJian Tian, XiaoWei Gong, FangYuan He, JiaLuan He and XuQi Wang

To solve the problem that the traditional received signal strength indicator real-time location method does not test the attenuation characteristics of the electromagnetic…

Abstract

Purpose

To solve the problem that the traditional received signal strength indicator real-time location method does not test the attenuation characteristics of the electromagnetic wave transmission in the location area, which cannot guarantee the accuracy of the location, resulting in a large location error.

Design/methodology/approach

At present, the compressed sensing (CS) reconstruction algorithm can be roughly divided into the following two categories (Zhouzhou and Fubao, 2014; Lagunas et al., 2016): one is the greedy iterative algorithm proposed for combinatorial optimization problems, which includes matching pursuit algorithm (MP), positive cross matching tracking algorithm (OMP), greedy matching tracking algorithm, segmented orthogonal matching tracking algorithm (StOMP) and so on. The second kind is the convex optimization algorithm, which also called the optimization approximation method. The common method is the basic tracking algorithm, which uses the norm instead of the norm to solve the optimization problem. In this paper, based on the piecewise orthogonal MP algorithm, the improved StOMP reconstruction algorithm is obtained.

Findings

In this paper, the MP algorithm (OMP), the StOMP and the improved StOMP algorithm are used as simulation reconstruction algorithms to achieve the comparison of location performance. It can be seen that the estimated position of the target is very close to the original position of the target. It is concluded that the CS grid-based target stepwise location method in underground tunnel can accurately locate the target in such specific region.

Originality/value

In this paper, the offline fingerprint database in offline phase of location method is established and the measurement of the electromagnetic noise distribution in different localization areas is considered. Furthermore, the offline phase shares the work of the location process, which greatly reduces the algorithm complexity of the online phase location process and the power consumption of the reference node, meanwhile is easy to implement under the same conditions, as well as conforms to the location environment.

Details

Sensor Review, vol. 40 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

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Article
Publication date: 26 May 2020

Changhai Lin, Zhengyu Song, Sifeng Liu, Yingjie Yang and Jeffrey Forrest

The purpose of this paper is to analyze the mechanism and filter efficacy of accumulation generation operator (AGO)/inverse accumulation generation operator (IAGO) in the…

Abstract

Purpose

The purpose of this paper is to analyze the mechanism and filter efficacy of accumulation generation operator (AGO)/inverse accumulation generation operator (IAGO) in the frequency domain.

Design/methodology/approach

The AGO/IAGO in time domain will be transferred to the frequency domain by the Fourier transform. Based on the consistency of the mathematical expressions of the AGO/IAGO in the gray system and the digital filter in digital signal processing, the equivalent filter model of the AGO/IAGO is established. The unique methods in digital signal processing systems “spectrum analysis” of AGO/IAGO are carried out in the frequency domain.

Findings

Through the theoretical study and practical example, benefit of spectrum analysis is explained, and the mechanism and filter efficacy of AGO/IAGO are quantitatively analyzed. The study indicated that the AGO is particularly suitable to act on the system's behavior time series in which the long period parts is the main factor. The acted sequence has good effect of noise immunity.

Practical implications

The AGO/IAGO has a wonderful effect on the processing of some statistical data, e.g. most of the statistical data related to economic growth, crop production, climate and atmospheric changes are mainly affected by long period factors (i.e. low-frequency data), and most of the disturbances are short-period factors (high-frequency data). After processing by the 1-AGO, its high frequency content is suppressed, and its low frequency content is amplified. In terms of information theory, this two-way effect improves the signal-to-noise ratio greatly and reduces the proportion of noise/interference in the new sequence. Based on 1-AGO acting, the information mining and extrapolation prediction will have a good effect.

Originality/value

The authors find that 1-AGO has a wonderful effect on the processing of data sequence. When the 1-AGO acts on a data sequence X, its low-pass filtering effect will benefit the information fluctuations removing and high-frequency noise/interference reduction, so the data shows a clear exponential change trends. However, it is not suitable for excessive use because its equivalent filter has poles at the non-periodic content. But, because of pol effect at zero frequency, the 1-AGO will greatly amplify the low-frequency information parts and suppress the high-frequency parts in the information at the same time.

Details

Grey Systems: Theory and Application, vol. 11 no. 1
Type: Research Article
ISSN: 2043-9377

Keywords

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