Electronic Publishing in its Context

Contextual aspects of electronic publishing (and more generally of diversified publishing) are discussed. Definitions and concepts are introduced. Pending issues and challenges are identified. The accent is put on the need for providing authenticated and validated information. The electronic medium is a new medium per se that will exist together with other ones, such as paper, but it will call for specific procedures, strategies and policies. A lot has still to be done on the human level. This revised version was published online in August 2006 with corrections to the Cover Date.     

Electronic Yellow-Page Services: The Star*s Family as an Example of Diversified Publishing

The broad currently accepted definition of electronic publishing encompasses also yellow-page services on the web. Together with their equivalent on paper, they are an example of diversified publishing. Some of these include validation and authentication steps which are sine qua non requirements for a service worthy of its name. We briefly describe here such a service with its outstanding features and procedures. We also discuss the maintenance processes and illustrate how constraints at the level of the distribution can downgrade an otherwise rich compilation of information. This revised version was published online in August 2006 with corrections to the Cover Date.     

The Role of Data Centres in the Era of Electronic Publishing|How CDS weaves links towards astronomical databases and archives

The astronomy data centres, and in particular the Centre de Données astronomiques de Strasbourg (CDS), have been building electronic information services for many years. References of publications, observational data related to objects, data tables, nomenclature, have been homogenized and organized into information retrieval systems. This undertaking implied an effort of collaboration between data centres, data providers, agencies, journal editors, etc. Evolution in recent years has brought the data centres closer from the publishing process. General standards for electronic tables, tabular data, and catalogues have been proposed and implemented. With the emergence of fully electronic publication, new digital library services are being organized, and pave the way to innovative new services, linking publications to information from other sources, and making use of new methods for textual information retrieval. The data centres expect to play a key rôle in these new developments, taking advantage of their expertise in the development of value-added services, and of their long-term involvement towards a fully linked astronomy information system.     

The eruption of a prominence and coronal mass ejection which drive reconnection

Two possible limiting scenarios are proposed for the production of a coronal mass ejection. In the first the magnetic field around a prominence evolves until it loses equilibrium and erupts, which drives reconnection below the prominence and an eruption of the overlying magnetic arcade. In the second a large-scale magnetic arcade evolves until it loses equilibrium and erupts, thereby causing a prominence to erupt. In general it is likely to be the non-equilibrium of the coupled system which creates the eruption. Furthermore, large quiescent prominences are expected to be centred within the magnetic bubble of a coronal mass ejection whereas when active-region prominences erupt they are likely to be located initially to one side of the bubble.A model is set up for the eruption of a magnetically coupled prominence and coronal mass ejection. This represents a development of the Anzer and Pneuman (1982) model by overcoming two limitations of it, namely that: it is not globally stable initially and so one wonders how it can be set up in a stable way before the eruption; it has reconnection driving the CME whereas recent observations suggest that the reverse may be happening. In our model we assume that magnetic reconnection below the prominence is driven by the eruption and the driver is magnetic non-equilibrium in the coupled prominence-mass ejection system. The prominence is modelled as a twisted flux tube and the mass ejection as an overlying void and magnetic bubble. Two different models of the prominence are considered. In one a globally stable equilibrium becomes unstable when a threshold magnetic flux below the prominence is exceeded and, in the other, equilibrium ceases to exist. In both cases, the prominence and mass-ejection accelerate upwards before reaching constant velocities in a manner that is consistent with observations. It is found that the greater the reconnection that is driven by the eruption, the higher is the final speed.     

电水准的参数测定

介绍了低纬子午环的水平差分两部分测定的要求和电水准的实际配置情况，分析了在这种配置中系统参数增多的原因，叙述了测定这些参数的方法，并提出在参数测定后如何保持系统状态的要求。     

电网频率的快速,高分辨率测量方法与技术

介绍了快速、高分辨率测量电网频率的方法与技术 ,并在电力生产与调度中得到实际应用。这一方法与技术对于一般低频频率的测量具有普遍意义。     

面向Web服务的天文数据发布技术

目前主流的天文数据发布主要使用基于Web页面和基于REST风格的Web服务两种发布技术,但存在诸多不足,特别是不利于自动化工具实现机器识别并调用。WebService技术作为一种日趋成熟的分布式计算模型,拥有跨平台与松耦合等很多优势,通过Web服务实现天文数据发布可以提高天文研究工作的灵活性和自动化程度。对Web服务在虚拟天文台中的应用情况及目前主要的天文数据发布技术进行了系统的调研,并在此基础上就如何实现符合IVOA规范且面向Web服务的天文数据发布服务进行了分析,针对一个天文数据发布实例,设计并实现了同时支持SOAP风格和REST风格的锥型检索服务,测试结果表明服务设计是成功的。     

The optimum distance at which to determine the size of a giant air shower

To determine the size of an extensive air shower it is not necessary to have knowledge of the function that describes the fall-off of signal size from the shower core (the lateral distribution function). In this paper an analysis with a simple Monte Carlo model is used to show that an optimum ground parameter can be identified for each individual shower. At this optimal core distance, r_opt, the fluctuations in the expected signal, S(r_opt), due to a lack of knowledge of the lateral distribution function are minimised. Furthermore it is shown that the optimum ground parameter is determined primarily by the array geometry, with little dependence on the energy or zenith angle of the shower or choice of lateral distribution function. For an array such as the Pierre Auger Southern Observatory, with detectors separated by 1500 m in a triangular configuration, the optimum distance at which to measure this characteristic signal is close to 1000 m.     

1997年电子出版物(英)

科学期刊的出版和发行技术正在迅速变化．主要对Ap.J.如何使用电子投稿方式及该杂志的网上版作了介绍．同时也叙述了较快的审稿及非常快速的出版等方面的进展。     

云南天文台1m RCC望远镜电气系统的改造

概述了云南天文台1m RCC望远镜电气改造的软硬件设计及所得的结果。     

Technologies and science archives for ultraviolet astronomy

This paper summarizes 17 talks presented during the Technological sessions at the “Challenges in UV Astronomy” conference. It is based on summaries submitted by the presenters, on the slides of their talks, on notes written by the authors, and on additional material kindly submitted to the lead author. In many instances the summaries were written by the presenters themselves and are included as-submitted to the authors with just minor editorial interference. In other cases one of the editors wrote the summary based on their notes and on the files of the actual presentations. The contributions are placed in the general context of the current knowledge in the field. The sessions were devoted to: [a] detectors, [b] optics, [c] integration and verification procedures for vacuum UV instruments and [d] calibration and archival research. A cautionary note: this is not a regular article in these proceedings presenting one idea, an experiment, of a result. It is rather a distillation of what was presented at the NUVA/ESO/IAG meeting at the sessions deemed technological, therefore it will lack an overall coherence although the individual sections and subsections should be logically connected.     

Masses for which triple collision is regularizable

We consider the regularization by continuity w.r.t. initial conditions (geometric or Easton method) which has a sense both in physical and computational aspects. Using the idea of triple collision manifold of McGehee we study the values of masses for which the invariant manifolds of equilibrium points coincide. Local analytical equations are continuated numerically. So one gets the masses satisfying a necessary condition. Again analytically we discuss the neighbourhood of t.c.m. at the equilibrium points. A necessary and sufficient condition in terms of integrals along invariant manifolds is found for the rectilinear case. This can be tested for the masses obtained above. Only a countable (symmetric) set of masses remains. Then, due to errors in physical measurements or numerical integrations we can never expect a regular behaviour. Extension to the planar case is also taken into account.Proceedings of the Sixth Conference on Mathematical Methods in Celestial Mechanics held at Oberwolfach (West Germany) from 14 to 19 August, 1978.