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Article
Publication date: 14 March 2022

Dongfang Sun, Jingchun Tang, Xiuping Zhang, Xudong Yuan, Yue Qian, Fangping Ye, Bin Ye and Bin Jiang

The leakage problem caused by machining error, assembly error, wearing and thermal deformation has been the main factor hindering the development of scroll compressor. This paper…

239

Abstract

Purpose

The leakage problem caused by machining error, assembly error, wearing and thermal deformation has been the main factor hindering the development of scroll compressor. This paper aims to investigate the lubrication characteristics of radial clearance and further optimize the radial clearance, which can reduce the leakage in the tangential direction of the working chamber.

Design/methodology/approach

This paper establishes a model of radial clearance oil film lubrication in scroll compressor. And, the method to solve the Reynolds and energy equations is presented, as well as the dimensionless and discretization by finite element difference method. To verify the established model, performance experiment of scroll compressor for electric vehicle air conditioning system is also carried out.

Findings

Based on the presented model, the temperature field and distribution of the oil film in the radial clearance are analyzed. And the influence of the structural parameter on the radial clearance is further discussed. The optimum radial clearance could be achieved at β = 40°–42°, where the orbiting scroll is in the state of rotary balance. And, the simulation results coincide well with the experimental results.

Originality/value

This work provides an effective model to evaluate the lubrication characteristics of radial clearance in scroll compressor, which can provide guidance for the design of scroll compressor.

Details

Industrial Lubrication and Tribology, vol. 74 no. 5
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 30 January 2025

Huijun Li, Longbo Duan, Qirun Wang, Yilun Zhang and Bin Ye

The application of industrial robots in modern production is becoming increasingly widespread. In the context of flexible production lines, quickly and accurately identifying and…

10

Abstract

Purpose

The application of industrial robots in modern production is becoming increasingly widespread. In the context of flexible production lines, quickly and accurately identifying and grasping specified workpieces is particularly important. This study aims to propose a grasping scheme that combines traditional methods with deep learning to improve grasping accuracy and efficiency.

Design/methodology/approach

First, a dataset generation method is proposed, which constructs a point cloud dataset close to the real scene without the need for extensive data collection. Then, the 3D object detection algorithm PointPillars is improved based on the features of the scene point cloud, allowing for the analysis of part poses to achieve grasping. Finally, a grasp detection strategy is proposed to match the optimal grasp pose.

Findings

Experimental results show that the proposed method can quickly and easily construct high-quality datasets, significantly reducing the time required for preliminary preparation. Additionally, it can effectively grasp specified workpieces, significantly improving grasping accuracy and reducing computation time.

Originality/value

The main contribution of this paper is the integration of a novel dataset generation method, improvements to the PointPillars algorithm for 3D object detection and the development of an optimal grasp detection strategy. These advancements enable the grasping system to handle real-world scenarios efficiently and accurately, demonstrating significant improvements over traditional methods.

Details

Industrial Robot: the international journal of robotics research and application, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 4 February 2020

Gao Lin, Wen-Bin Ye, Zhi-Yuan Li and Jun Liu

The purpose of this paper is to present an accurate and efficient element for analysis of spherical shell structures.

173

Abstract

Purpose

The purpose of this paper is to present an accurate and efficient element for analysis of spherical shell structures.

Design/methodology/approach

A scaled boundary finite element method is proposed, which offers more advantages than the finite element method and boundary element method. Only the boundary of the computational domain needs to be discretized, but no fundamental solution is required.

Findings

The method applies to thin as well as thick spherical shells, irrespective of the shell geometry, boundary conditions and applied loading. The numerical solution converges to highly accurate result with raising the order of high-order elements.

Originality/value

The modeling strictly follows three-dimensional theory of elasticity. Formulation of the surface finite elements using three translational degree of freedoms per node is required, which results in considerably simplifying the computation. In the thickness directions, it is solved analytically, no problem of high aspect ratio arises and transverse shear locking can be successfully avoided.

Details

Engineering Computations, vol. 37 no. 6
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 7 March 2016

Xiaohua Bao, Guanlin Ye, Bin Ye, Yanbin Fu and Dong Su

The purpose of this paper is to evaluate the co-seismic and post-seismic behaviors of an existed soil-foundation system in an actual alternately layered sand/silt ground including…

328

Abstract

Purpose

The purpose of this paper is to evaluate the co-seismic and post-seismic behaviors of an existed soil-foundation system in an actual alternately layered sand/silt ground including pore water pressure, acceleration response, and displacement et al. during and after earthquake.

Design/methodology/approach

The evaluation is performed by finite element method and the simulation is performed using an effective stress-based 2D/3D soil-water coupling program DBLEAVES. The calculation is carried out through static-dynamic-static three steps. The soil behavior is described by a new rotational kinematic hardening elasto-plastic cyclic mobility constitutive model, while the footing and foundation are modeled as elastic rigid elements.

Findings

The shallow (short-pile type) foundation has a better capacity of resisting ground liquefaction but large differential settlement occurred. Moreover, most part of the differential settlement occurred during earthquake motion. Attention should be paid not only to the liquefaction behavior of the ground during the earthquake motion, but also the long-term settlement after earthquake should be given serious consideration.

Originality/value

The co-seismic and post-seismic behavior of a complex ground which contains sand and silt layers, especially long-term settlement over a period of several weeks or even years after the earthquake, has been clarified sufficiently. In some critical condition, even if the seismic resistance is satisfied with the design code for building, detailed calculation may reveal the risk of under estimation of differential settlement that may give rise to serious problems.

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Article
Publication date: 22 August 2008

Patrick X.W. Zou, Shouqing Wang and Dongping Fang

The purpose of this paper is to develop a life cycle risk management framework for public private partnership (PPP) infrastructure projects that lead to the realization of value…

9210

Abstract

Purpose

The purpose of this paper is to develop a life cycle risk management framework for public private partnership (PPP) infrastructure projects that lead to the realization of value for money and balance of interests between different partners including the public and end users.

Design/methodology/approach

This paper draws on extensive theoretical research and literature reviews, coupled with case study methodologies. A comprehensive review of current literature in the field was first carried out. Then three PPP infrastructure projects, two from Australia and one from China, are studied to scrutinize reasons leading to their dilemma and articulate the valuable lessons learnt in relation to risk analysis and mitigation.

Findings

The paper found that properly assessing risks (financial, government's political and public's acceptance/rejection risks), ensuring value for money and protecting the public (and end users') interests are essential in PPP infrastructure projects and this can only be achieved through optimal risk identification, assessment, allocation and management from a life cycle perspective and balanced interests between the Government/public and private partners as well as product end users.

Research limitations/implications

The paper was limited to proposing the framework; therefore the next step should be testing the framework.

Practical implications

The framework proposed in this paper should be practical and useful for professionals in managing the risks associated with the procurement of PPP infrastructure projects.

Originality/value

The PPP method has been increasingly used to procure large‐scale infrastructures such as freeways, railways, tunnels and bridges worldwide. While there have been many successful PPP projects, unsuccessful cases abound and studying them can help people better manage the risks in future PPP infrastructure projects. To ensure the success of PPP infrastructure projects, it is important for all partners to manage the risks from a project life cycle perspective, in which risks are identified and assessed in the earliest possible project stage and are allocated to the parties who are in the best position to control them. Furthermore, it is also important to continuous monitor the risks and develop proactive risk respond strategies throughout the project life cycle. To this end, this paper provides a life‐cycle risk management framework for PPP infrastructure projects.

Details

Journal of Financial Management of Property and Construction, vol. 13 no. 2
Type: Research Article
ISSN: 1366-4387

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Article
Publication date: 15 June 2020

Musa Waziri, Ahmed Zubir Bin Ibrahim and Zainal Bin Md. Zan Bin Md Zan

Although the literature has shown that government intervention programs on poverty alleviation have now become a common practice and accepted policy framework in tackling the…

335

Abstract

Purpose

Although the literature has shown that government intervention programs on poverty alleviation have now become a common practice and accepted policy framework in tackling the menace of poverty which has remained the major challenge to all leaders around the globe. Therefore, the purpose of this paper is to examine the impact of (conditional cash transfer, youth empowerment and microcredit scheme) on poverty alleviation in Niger state-Nigeria.

Design/methodology/approach

The hypotheses of the study were tested using personally administered questionnaires survey method; 442 valid and useable questionnaires were obtained for the study, while PLS-SEM path modeling was adopted to evaluate the statistical relationship between those three programs and poverty alleviation. According to the statistical result of the study, the research constructs have a satisfactory convergent and discriminant validity. Therefore the study has established a strong positive relationship between government intervention programs and poverty alleviation. The socioeconomic assessment of the respondents further justified the above assumption.

Findings

Also, the research findings of this study may found to be beneficial to the government, international organization, researchers particularly those who are conducting research on poverty reduction programs.

Research limitations/implications

The study used the perceptions of the beneficiaries of those programs in nine selected local government areas within the three senatorial districts in Niger state-Nigeria.

Originality/value

Similarly, the findings of the study would offer some meaningful contribution to the body of knowledge on studies related to poverty alleviation programs like conditional cash transfer, youth empowerment and microcredit scheme, where expert in that field would explore the advantage of these findings by utilizing the impacts of those programs on the beneficiaries for policy framework.

Details

Journal of Economic and Administrative Sciences, vol. 36 no. 4
Type: Research Article
ISSN: 2054-6238

Keywords

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Article
Publication date: 1 April 2005

Li‐teh Sun

Man has been seeking an ideal existence for a very long time. In this existence, justice, love, and peace are no longer words, but actual experiences. How ever, with the American…

814

Abstract

Man has been seeking an ideal existence for a very long time. In this existence, justice, love, and peace are no longer words, but actual experiences. How ever, with the American preemptive invasion and occupation of Afghanistan and Iraq and the subsequent prisoner abuse, such an existence seems to be farther and farther away from reality. The purpose of this work is to stop this dangerous trend by promoting justice, love, and peace through a change of the paradigm that is inconsistent with justice, love, and peace. The strong paradigm that created the strong nation like the U.S. and the strong man like George W. Bush have been the culprit, rather than the contributor, of the above three universal ideals. Thus, rather than justice, love, and peace, the strong paradigm resulted in in justice, hatred, and violence. In order to remove these three and related evils, what the world needs in the beginning of the third millenium is the weak paradigm. Through the acceptance of the latter paradigm, the golden mean or middle paradigm can be formulated, which is a synergy of the weak and the strong paradigm. In order to understand properly the meaning of these paradigms, however, some digression appears necessary.

Details

International Journal of Sociology and Social Policy, vol. 25 no. 4/5
Type: Research Article
ISSN: 0144-333X

Keywords

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Book part
Publication date: 14 October 2022

Hong Lu, Bin Liang and Deena DeVore

The victim’s rights movement and restorative justice (RJ) have gained momentum around the world. More laws and policies have focused on crime victims and their families. Western…

Abstract

The victim’s rights movement and restorative justice (RJ) have gained momentum around the world. More laws and policies have focused on crime victims and their families. Western literature suggests that the victim’s family suffers physical, emotional, and financial tolls and that the power of the victim’s family in pursuing justice for their loved ones remains limited. This is particularly concerning within the political and legal context of the abolitionist movement, innocence project, and human rights groups’ campaigns against police torture. Grounded in the perspectives of RJ and Chinese legal culture, this study examines the victim’s family, represented by Ding and senior Yu, of the Nian Bin capital murder case. Drawing on published reports and using the thematic content analysis method, this study examines the following aspects of victim’s family in a death penalty case: 1) victim family’s physical, emotional, and financial tolls; 2) victims’ family and the criminal justice system; 3) victims’ family and the media; and 4) the relationship between the victims’ and the accused’s families. This study concludes with discussions of the competing goals of families impacted by a crime and RJ practices that would help mitigate the loss of the victim’s family and enhance their confidence in the criminal justice system.

Details

The Justice System and the Family: Police, Courts, and Incarceration
Type: Book
ISBN: 978-1-80382-360-7

Keywords

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Article
Publication date: 19 October 2010

Bo Xu, Zhangxi Lin and Bingjia Shao

As a type of electronic commerce, online C2C markets have experienced a rapid growth in both sales volume and user numbers. Buy‐it‐now (BIN) auction is a mechanism to facilitate…

6509

Abstract

Purpose

As a type of electronic commerce, online C2C markets have experienced a rapid growth in both sales volume and user numbers. Buy‐it‐now (BIN) auction is a mechanism to facilitate online auctions, and is adopted by the major online C2C marketplaces. This study aims to investigate consumers' purchase and adoption of risk relief service in BIN auctions in the online C2C market from the perspective of perceived risk.

Design/methodology/approach

A research model is developed based on relevant theory. Data are collected from American and Chinese consumers through a web‐based experiment system that simulates the transaction process on online C2C markets. The proposed hypotheses are tested with logistic and multiple linear regressions.

Findings

The results show that buyer's purchase behavior and usage of risk relief service for a transaction in BIN auctions are determined by the perceived risk, which is influenced by the buyer's risk attitude, seller online reputation, and the product price and type.

Practical implications

This study provides an in‐depth understanding of consumers' behaviors on online C2C markets at transaction level, and makes implications for online marketplace operation and business strategy making.

Originality/value

The primary value of this paper lies in providing a better understanding of consumers' behaviors on online C2C market, and investigating the factors that influence the consumers' purchase and adoption of risk relief service in online BIN auctions from the perceived risk perspective.

Details

Internet Research, vol. 20 no. 5
Type: Research Article
ISSN: 1066-2243

Keywords

Available. Open Access. Open Access
Article
Publication date: 17 June 2024

Wagdi Rashad Ali Bin-Hady, Jamal Kaid Mohammed Ali and Mustafa Ahmed Al-humari

Chat Generative Pre-trained Transformer (ChatGPT) has become everyone’s talk. It frightens many professionals, who worry about losing their jobs. ChatGPT may reconstruct some…

2196

Abstract

Purpose

Chat Generative Pre-trained Transformer (ChatGPT) has become everyone’s talk. It frightens many professionals, who worry about losing their jobs. ChatGPT may reconstruct some professions; some occupations may vanish while new ones may appear.

Design/methodology/approach

This mixed-methods study explores whether and how the use of ChatGPT impacts English is taught as a foreign language (EFL) students' social and emotional learning (SEL). The study used a questionnaire and collected perception data from 57 EFL students. A discussion with seven EFL professors was also formulated to triangulate the findings.

Findings

Results indicate that EFL students have high positive perceptions of using ChatGPT in their learning (M = 3.87). Results also showed that using ChatGPT has a moderate impact on EFL students' SEL (R = 514). This moderate effect was confirmed by the qualitative findings, which indicated that ChatGPT positively impacts EFL students' SEL by allowing them to practice conversation skills, aiding them in managing their emotional intelligence, providing them with feedback and reducing their anxiety. However, findings also indicated that ChatGPT reduces students' creativity and limits their emotional growth. Finally, the findings reported that for better use of ChatGPT, supervision is key.

Originality/value

This study recommends the use of ChatGPT in a way that helps students' creativity and emotional growth.

Details

Journal of Research in Innovative Teaching & Learning, vol. 17 no. 2
Type: Research Article
ISSN: 2397-7604

Keywords

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