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Article
Publication date: 26 October 2010

Diqiu Xu

This paper aims to provide suggestions and predictions on library consortium development trends in China under new circumstances, as summarised from observations made of CALIS and…

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Abstract

Purpose

This paper aims to provide suggestions and predictions on library consortium development trends in China under new circumstances, as summarised from observations made of CALIS and CASHL.

Design/methodology/approach

From an overview and comparative analyses of the similar and different characteristics of CALIS and CASHL – two of the most influential library consortia in China – mainly on sources of funds, organisational management, cooperative collection development, collection character, resource sharing and services, this paper summarises the main advantages and disadvantages of the consortia to gain valuable insights.

Findings

Seven advantages and three disadvantages in CALIS and CASHL are summarised, and from the insights gained, the following suggestions and predictions on library consortium trends in China arise: the cost‐reducing and highly effective models of CALIS and CASHL will be promoted; uniformity and standardisation of construction will earn more respect and be realised; library consortia will develop in the digital library direction; the scope of consortia will be broadened; and different library consortia will move toward integration.

Practical implications

The advantages and disadvantages of the CALIS and CASHL consortia summarised by this paper, and the suggestions of this paper with regard to trends for library consortia in China provide valuable inspiration and reference for decision‐makers. Library consortium practices in China will develop and change in the directions suggested by this paper.

Originality/value

The comparative analysis of of the characteristics of the CALIS and CASHL consortia characteristics is original. The summary of the main advantages and disadvantages of the two consortia, together with suggestions and predictions regarding the trends for library consortia in China, provide useful references for researchers, the public and decision‐makers in China as well as other countries regarding library consortium experiences and improving and developing consortia.

Details

Library Management, vol. 31 no. 8/9
Type: Research Article
ISSN: 0143-5124

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Article
Publication date: 5 March 2018

Jianping Huang, Wenyuan Liao and Zhenchun Li

The purpose of this paper is to develop a new finite difference method for solving the seismic wave propagation in fluid-solid media, which can be described by the acoustic and…

187

Abstract

Purpose

The purpose of this paper is to develop a new finite difference method for solving the seismic wave propagation in fluid-solid media, which can be described by the acoustic and viscoelastic wave equations for the fluid and solid parts, respectively.

Design/methodology/approach

In this paper, the authors introduced a coordinate transformation method for seismic wave simulation method. In the new method, the irregular fluid–solid interface is transformed into a horizontal interface. Then, a multi-block coordinate transformation method is proposed to mesh every layer to curved grids and transforms every interface to horizontal interface. Meanwhile, a variable grid size is used in different regions according to the shape and the velocity within each region. Finally, a Lebedev-standard staggered coupled grid scheme for curved grids is applied in the multi-block coordinate transformation method to reduce the computational cost.

Findings

The instability in the auxiliary coordinate system caused by the standard staggered grid scheme is resolved using a curved grid viscoelastic wave field separation strategy. Several numerical examples are solved using this new method. It has been shown that the new method is stable, efficient and highly accurate in solving the seismic wave equation defined on domain with irregular fluid–solid interface.

Originality/value

First, the irregular fluid–solid interface is transformed into a horizontal interface by using the coordinate transformation method. The conversion between pressures and stresses is easy to implement and adaptive to different irregular fluid–solid interface models, because the normal stress and shear stress vanish when the normal angle is 90° in the interface. Moreover, in the new method, the strong false artificial boundary reflection and instability caused by ladder-shaped grid discretion are resolved as well.

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