Search results

1 – 4 of 4
Per page
102050
Citations:
Loading...
Access Restricted. View access options
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.

Access Restricted. View access options
Article
Publication date: 7 October 2022

Joshua Ping Ang, Guanlin Gao and Andrew Sparks

The authors analyze the effects of political freedom and personal freedom on the spread of COVID-19 in a cross-country study. The authors also investigate how income inequality…

108

Abstract

Purpose

The authors analyze the effects of political freedom and personal freedom on the spread of COVID-19 in a cross-country study. The authors also investigate how income inequality, urbanization and previous experience with a similar respiratory epidemic/pandemic, such as SARS and MERS, affect the spread of COVID-19.

Design/methodology/approach

The authors employ data from 102 countries to examine the relationship of countries' economic and sociopolitical factors, such as political freedom and personal freedom and their COVID-19 infection cases per million population at 120 days, 150 days and 180 days after the reported 10th infection case. The authors also include the log term of real GDP per capita to control for counties' economic development and regional dummies to control for regional-specific effects.

Findings

Results of this study show that personal freedom, rather than democracy, has a significant positive effect on countries' COVID-19 infection cases. On the contrary, democracy has a negative impact on the infection rate. The authors also find that socioeconomic factors such as higher income inequality and urbanization rate adversely affect the COVID-19 infection cases. A larger older population is associated with fewer infection cases, holding everything else equal. Previous experiences with the coronavirus crisis affect countries only at the 120 days mark. Real GDP per capita has no significant effect.

Originality/value

The main contribution of this paper is to jointly explore personal freedom, which implies a social framework with more emphasis on self-value and self-realization and political freedom, that is, democracy. The authors show that it is personal freedom, rather than democracy, that contributes to higher COVID-19 infection cases. Democracy, on the other hand, reduces the number of infection cases.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/IJSE-12-2021-0769

Details

International Journal of Social Economics, vol. 50 no. 3
Type: Research Article
ISSN: 0306-8293

Keywords

Access Restricted. View access options
Article
Publication date: 19 September 2019

Fang Wang, Lijun Lu, Lu Xu, Bihu Wu and Ying Wu

Tourists’ destination image is crucial for visiting intentions. An ancient capital with diverse characteristics is an important component of China’s urban tourism. The purpose of…

378

Abstract

Purpose

Tourists’ destination image is crucial for visiting intentions. An ancient capital with diverse characteristics is an important component of China’s urban tourism. The purpose of this paper is to address the following questions: what are the differences and commonalities of the perceived destination image of ancient capitals? What makes the difference of the perceived destination image in these cities? Aside from the exterior factors, are there internal factors of cities that influence tourists’ cognition and perception of destination image?

Design/methodology/approach

The comment text data of Baidu tourism website were used to determine the differences in the destination images of China’s four great ancient capitals: Beijing, Xi’an, Nanjing and Luoyang. ROST content mining and semantic network analysis were for differences and commonalities of the perceived destination image, and correlation analysis was used to explore the internal factors of cities that influence tourists’ cognition and perception of destination image.

Findings

Though the same as ancient capital, the four ancient capitals’ images are far apart; historical interests are the core of tourism experience in ancient capital city; image perception is from physical carrier, history and culture, and human cognition; tourist’ destination affect of ancient capital is most from its history and culture; protecting identity and maintaining daily life are crucial for ancient city tourism.

Originality/value

Previous studies on ancient capitals have focused on the invariable identity of ancient capitals’ destination images, and left a gap on determining from where the invariable identity comes in general and how much it influences destination image. This gap was addressed in this study, by analyzing the destination images of four ancient capitals in China as cases. In this way, this study provided reference to the other ancient cities worldwide.

Details

International Journal of Tourism Cities, vol. 6 no. 2
Type: Research Article
ISSN: 2056-5607

Keywords

Access Restricted. View access options
Article
Publication date: 16 January 2025

Long Wang, Fengtao Wang, Linkai Niu, Xin Li, Zihao Wang and Shuping Yan

The purpose of this paper is to combine triboelectric nanogeneration technology with ball bearing structure to achieve energy collection and fault monitoring.

11

Abstract

Purpose

The purpose of this paper is to combine triboelectric nanogeneration technology with ball bearing structure to achieve energy collection and fault monitoring.

Design/methodology/approach

In this paper, according to the rotation mode of ball bearings, the freestanding mode of triboelectric nanogeneration is selected to design and manufacture a novel triboelectric nanogeneration device Rolling Ball Triboelectric Nanogenerator (RB-TENG) which combines rotary energy collection with ball bearing fault self-sensing.

Findings

The 10,000s continuous operation experiment of the RB-TENG is carried out to verify its robustness. The accurate feedback relationship between the RB-TENG and rotation velocity can be demonstrated by the fitting comparison between the theoretical and experimental electrical signal periods at a certain time. By comparing the output electrical signals of the normal RB-TENG and the rotor spalling RB-TENG and polytetrafluoroethylene (PTFE) balls with different degrees of wear at 500 r/min, it can be concluded that the RB-TENG has an ideal monitoring effect on the radial clearance distance of bearings. The spalling fault test of the RB-TENG stator inner ring and rotor outer ring is carried out.

Originality/value

Through coupling experiments of rotor spalling fault of the RB-TENG and PTFE balls fault with different degrees of wear, it can be seen that when rotor spalling fault occurs, balls wear has a greater impact on the normal operation of the RB-TENG, and it is easier to identify. The fault self-sensing ability of the RB-TENG can be obtained, which is expected to provide an effective scheme for monitoring the radial wear clearance distance of ball bearings.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2024-0295/

Details

Industrial Lubrication and Tribology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0036-8792

Keywords

1 – 4 of 4
Per page
102050