谈高校图书馆特色馆藏的建设

本文简述了高校图书馆特色馆藏建设的原则,并从地方特色、专业特色、虚拟馆藏建设等三个方面进行了探讨.     

A Relook into the Impact of Divestitures in the Presence of Agency Conflicts: Evidence from Property Subsidiary Sell-Offs in China

We analyze property subsidiary sell-offs in China to examine her market reaction to firms’ divestiture decisions. Overall, the response from the stock market is neutral. However, detailed analysis reveals that the market reacts differently to property subsidiary sell-off announcements by state-owned enterprises (SOEs) and non-SOEs. Consistent with findings from extant literature, we find statistically positive market returns associated with non-SOE sell-off announcements. However, we find statistically negative market returns associated with SOE sell-off announcements. We suggest that this divergent market reaction is influenced by the institutional feature of the Chinese market and is consistent with the high agency costs associated with state ownership.     

Finite Prandtl number 2-D convection at high Rayleigh numbers

Finite Prandtl number thermal convection is important to the dynamics of planetary bodies in the solar system. For example, the complex geology on the surface of the Jovian moon Europa is caused by a convecting, brine-rich global ocean that deforms the overlying icy “lithosphere”. We have conducted a systematic study on the variations of the convection style, as Prandtl numbers are varied from 7 to 100 at Rayleigh numbers 106 and 108. Numerical simulations show that changes in the Prandtl number could exert significant effects on the shear flow, the number of convection cells, the degree of layering in the convection, and the number and size of the plumes in the convecting fluid. We found that for a given Rayleigh number, the convection style can change from single cell to layered convection, for increasing Prandtl number from 7 to 100. These results are important for determining the surface deformation on the Jovian moon Europa. They also have important implications for surface heat flow on Europa, and for the interior heat transfer of the early Earth during its magma ocean phase. Electronic Supplementary Material is available if you access this article at http://dx.doi.org/10.1007/s10069-002-0004-4. On that page (frame on the left side), a link takes you directly to the supplementary material.     

Web-cam’s potential for collaborative activities in the Earth sciences

We report here our experiences from using easily acquired web-cam components for collaborative ventures in the Earth sciences. We have used a variety of hardware and different software. We demonstrate from various locations in the U.S.A. the feasibility of using web-cam in multitudinous activities, relevant for conducting research and knowledge dissemination. We summarize the quality of the connections from the various combinations of communicating parties. Today, web-cams can be utilized as an economical and viable means of point-to-point communication in the Earth science community. Greater bandwidth is sorely needed for activities such as multi-party conferencing on the present internet network. We propose that web-cam can be readily deployed as a web-service for facilitating collaborative research over the GRID infrastructure, using the middleware Narada-Brokering. Web-cam will play an important role in the emerging field of geoinformatics.     

Interactive Web-Based Map: Applications to Large Data Sets in the Geosciences

Current advances in computer hardware, information technology and data collection techniques have produced very large data sets in a wide variety of scientific and engineering disciplines. We must harness this opportunity to visualize and extract useful information from geophysical and geological data. We have taken the task of data mining by implementing a map-like approach over a web server for interrogating the data, using a client-server paradigm. The spatial-data is mapped onto a two-dimensional grid from which the user (client) can quiz the data with the map-interface as a user extension. The data is stored on the server, while the computational gateway separating the client and the server can be the front-end of an electronic publication, electronic classroom, a survey, or an e-business. We have used a combination of Java, Java3D, and Perl for processing the data and communicating between the client and the server. The user can interrogate the geospatial data over any particular region with arbitrary dimensions and then receive back relevant statistical analysis, such as the histogram plots and local statistics. We have applied this method for the following data sets: (1.) distribution of prime numbers (2.) two-dimensional mantle convection (3.) three-dimensional mantle convection (4.) high-resolution satellite reflectance data over multiple wavelengths (5.) molecular dynamics describing the flow of blood in narrow vessels. Using the map-interface, one can actually interrogate this data over the Internet.     

Leisure Spaces,Community, and Third Places

ABSTRACT

After decades of highlighting the decline of social networks, leisure spaces as third places constitute a welcomed approach to mediate this loss. Third places are defined as public gathering places that ultimately contribute to the strength of community. We appreciate the concept and believe that it has and will continue to influence scholars in the field of leisure. For this reason, this research reflection argues Oldenburg's conceptualization of third places requires reconsideration. Specifically, we address the increasing prevalence of technology and question Oldenburg's claim that technology contributes to the isolation of individuals. We also encourage a more complex understanding of third places—one that is beyond the idealized notion of public places. Oldenburg's social dimensions of third places (enjoyment, regularity, pure sociability/social leveler, and diversity) are offered as a useful framework. More specifically, we argue that diversity is the most relevant characteristic when exploring third places as a platform for community.