15,085 research outputs found
Author GOH Rivera Sun Speech
No full textAuthor GOH Rivera Sun gives her speech during the banquet ceremonies of Mythcon 52 in Albuquerque, NM on July 31st, 2022
Assessment of Self-Archiving in Institutional Repositories: Depositorship and Full-Text Availability
No full textThis research evaluates the success of open access self-archiving in several well-known institutional repositories. Two assessment factors have been applied to examine the current practice of self-archiving: depositorship and the availability of full text. This research discovers that the rate of author self-archiving is low and that the majority of documents have been deposited by a librarian or administrative staff. Similarly, the rate of full-text availability is relatively low, except for Australian repositories. By identifying different practices of self-archiving, repository managers can create new strategies for the operation of their repositories and the development of archiving policies
Dr. Lin Sun, CAU, March 2013
No full textThis video is a conversation with Dr. Lin Sun. Dr. Sun talks about an exhibit at the Woodruff Library titled "At The Boundary." Jordan Moore, AUC Woodruff Library, is the interviewer
Simulation of flow induced noise in process of pump-turbine load rejection
No full textThe grid market is redistributed with significantly increase of the exploitation of unpredictable renewable energy, such as wind and solar energy sources, however, the ways of electricity generation by both wind and solar energy depend on environment which is extremely unstable. For the sake of balancing electricity generated by renewable energy, pumped storage power stations are experiencing a thriving process. As the core of pumped storage power station, the stable operation of the pump turbine is extremely important, especially for pump-turbine working at transient conditions. In order to study pressure fluctuating characteristics and its' influence on flow-induced noise, a continuous unsteady simulation was carried out in pump-turbine guide vane closing process under generating mode. In this article, wall sliding mesh was used to realize guide vane continuous motion, which ensured that the mesh quality at any moment was larger than 60% compared with the initial mesh quality, meanwhile, DES turbulent model was adopted in all calculations due to its good performance in many industrial cases. The whole pump-turbine model was meshed with structured mesh by commercial software ICEM, and five different mesh sizes were used in mesh sensitivity validation, with the size of 14 million selected finally. On the other hand, a test was performed by the team of Giorgio Pavesi to prove this model in open test facility in Padova University, the entire model validation was carried out according to ISO standards, and relative parameters were measured based on IEC standards. Commercial software ANYSYS CFX 16.2 was used to realize all simulating calculations with 8 computer cores, one month was taken to finish this calculation. The flow field calculating results were analyzed in frequency and time-frequency domains, including mass flow, pressure, and torque et al., in the meantime, the pressure on the surfaces of blades was regarded as flow-induced noise source to study sound field. The solution obtained from flow field illustrates that pressure fluctuating amplitudes at guide vane outlet is more than twice compared to the relative value at guide vane inlet location, the main reason is flow in the vaneless space that is close to runner is affected by rotor-rotor interaction. In addition, pressure pulsations at runner outlet arrive at peaks when two vortexes appear in draft tube with two different rotating directions. As for frequency domain characteristics, both strauhal number St=0.051 and St=1 are captured, whereas the spectrum of those pressure fluctuations that are close to guide vane outlet is 10 times of the relative value at guide vane inlet, which explains that rotor-rotor interaction has a stronger influence on flow field than rotor-stator interaction. Some rules are found by analyzing flow-induced noise in sound field, the analysis illustrates that flow-induced noise radiation level is related to both pressure fluctuating and shell natural frequency captured in exterior acoustic field, the shape of sound distribution is like "∞" and sound level distributions in different directions and faces are symmetrical, this explains that the blade noise radiation has obvious dipole characteristics. Furthermore, at the first and second-order blade passage frequencies, the effect of flow rate on the radiation performance of noise is stronger under larger flow conditions during guide vane closure, which becomes weaker under smaller flow conditions in the first half of the guide vane closure, as for the second half phase of guide vane closure, the results are exactly opposite to the previous phenomena. Moreover, flow-induced noise radiation is consistent with fluid characteristics during pump-turbine load rejection. Consequently, to improve pressure fluctuating characteristics can reduce flow-induced noise. © 2018, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering
Applying the NISO Metasearch Initiative Scheme to Enhance E-Resources Management at Rutgers University Library
No full textThis paper discusses problems in the management of library e-resources and attempts to identify potential solutions to the problems. By describing an e-resources enhancement project taken by Rutgers University Libraries, this paper points to the importance of providing contextually-rich metadata and reorganizing the accessibility of e-resources on a library’s website. It introduces how this Rutgers project adopted the National Information Standards Organization Metasearch Initiative to support the identification of appropriate e-collections for metaseaching. The outcomes of the project have facilitated a dynamic display of relevant e-resources to library users as an effective way of automatic access to library e-collections.Peer reviewe
A Metadata Manager's Role in Collaborative Projects: The Rutgers University Libraries Experience
No full textPurpose – This article discusses the roles and responsibilities of a metadata manager in collaborative digital projects.
Methodology – It describes the general requirements for metadata management, and introduces some scenarios in the practices of digital projects by the Rutgers University Libraries to support the generalized definition. A workflow of metadata management is illustrated.
Practical implications – With an explicit definition of the roles and responsibilities of the metadata manager, many other digital libraries that need to develop a new or optimize the existing workflow may find the Rutgers experience useful as reference.
Originality – Very few articles have explored this topic although the functions of metadata in the development of digital projects have been talked extensively.Peer reviewe
Factors to Assess Self-Archiving in Institutional Repositories
No full textThis paper proposes a group of factors that may be used to assess the success of open access self-archiving. It concentrates on self-archiving in institutional repositories. The authors emphasize the importance of examining content materials, particularly the availability of full text versus abstracts and the deposits archived by authors versus by others.Peer reviewe
Extension of the sun-synchronous Orbit
No full textThrough careful consideration of the orbit perturbation force due to the oblate nature of the primary body a secular variation of the ascending node angle of a near-polar orbit can be induced without expulsion of propellant. Resultantly, the orbit perturbations can be used to maintain the orbit plane in, for example, a near-perpendicular (or at any other angle) alignment to the Sun-line throughout the full year of the primary body; such orbits are normally termed Sun-synchronous orbits [1, 2]. Sun-synchronous orbits about the Earth are typically near-circular Low-Earth Orbits (LEOs), with an altitude of less than 1500 km. It is normal to design a LEO such that the orbit period is synchronised with the rotation of the Earth‟s surface over a given period, such that a repeating ground-track is established. A repeating ground-track, together with the near-constant illumination conditions of the ground-track when observed from a Sun-synchronous orbit, enables repeat observations of a target over an extended period under similar illumination conditions [1, 2]. For this reason, Sun-synchronous orbits are extensively used by Earth Observation (EO) platforms, including currently the Environmental Satellite (ENVISAT), the second European Remote Sensing satellite (ERS-2) and many more. By definition, a given Sun-synchronous orbit is a finite resource similar to a geostationary orbit. A typical characterising parameter of a Sun-synchronous orbit is the Mean Local Solar Time (MLST) at descending node, with a value of 1030 hours typical. Note that ERS-1 and ERS-2 used a MLST at descending node of 1030 hours ± 5 minutes, while ENVISAT uses a 1000 hours ± 5 minutes MLST at descending node [3]. Following selection of the MLST at descending node and for a given desired repeat ground-track, the orbit period and hence the semi-major axis are fixed, thereafter assuming a circular orbit is desired it is found that only a single orbit inclination will enable a Sun-synchronous orbit [2]. As such, only a few spacecraft can populate a given repeat ground-track Sun-synchronous orbit without compromise, for example on the MLST at descending node. Indeed a notable feature of on-going studies by the ENVISAT Post launch Support Office is the desire to ensure sufficient propellant remains at end-of-mission for re-orbiting to a graveyard orbit to ensure the orbital slot is available for future missions [4]. An extension to the Sun-synchronous orbit is considered using an undefined, non-orientation constrained, low-thrust propulsion system. Initially the low-thrust propulsion system will be considered for the free selection of orbit inclination and altitude while maintaining the Sun-synchronous condition. Subsequently the maintenance of a given Sun-synchronous repeat-ground track will be considered, using the low-thrust propulsion system to enable the free selection of orbit altitude. An analytical expression will be developed to describe these extensions prior to then validating the analytical expressions within a numerical simulation of a spacecraft orbit. Finally, an analysis will be presented on transfer and injection trajectories to these orbits
Batch Loading in Metadata Creation: A Case Study the Rutgers University Libraries Experience
No full textPurpose – The purpose of this article is to describe a workflow of automated batch loading metadata from existing text to a database.
Methodology/Approach – It introduces a case for the experience of metadata creation at Rutgers University Libraries in a collaborative digital project with the Hoboken Public Library in New Jersey.
Findings – It is found that a well-designed workflow is crucial to the success of metadata batch loading. It is also found that the metadata manager needs to collaborate with people of different roles and work carefully with data reorganization and transferring.
Practical Implications – Metadata creation and management is an integrated component of any digital project. Our experience in metadata batch loading has practical significance that may be incorporated into the practice of other metadata projects. The workflow introduced in this article will provide valuable example for librarians and information professionals to consider or redesign their own digital efforts.
Originality – Based on our real exercise, this workflow has been proven to be unique and useful. It was, after the writing of this article, applied to a new collaborative digital project and once again fulfilled the requirements for another batch transferring process.Peer reviewe
Supplemental Material - Transendoscopic flexible parallel continuum robotic mechanism for bimanual endoscopic submucosal dissection
No full textSupplemental Material for Transendoscopic flexible parallel continuum robotic mechanism for bimanual endoscopic submucosal dissection by Huxin Gao, Xiaoxiao Yang, Xiao Xiao, Xiaolong Zhu, Tao Zhang, Cheng Hou, Huicong Liu, Max Q-H Meng, Sun Lining, Xiuli Zuo, Yanqing Li, and Hongliang Ren in The International Journal of Robotics Research</p
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