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"Birkinshaw, M."
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Compact Symmetric Objects. III. Evolution of the High-luminosity Branch and a Possible Connection with Tidal Disruption Events
We use a sample of 54 compact symmetric objects (CSOs) to confirm that there are two unrelated CSO classes: an edge-dimmed, low-luminosity class (CSO 1), and an edge-brightened, high-luminosity class (CSO 2). Using blind tests, we show that CSO 2s consist of three subclasses: CSO 2.0, having prominent hot spots at the leading edges of narrow jets and/or narrow lobes; CSO 2.2, without prominent hot spots and with broad jets and/or lobes; and CSO 2.1, which exhibit mixed properties. Most CSO 2s do not evolve into larger jetted active galactic nuclei (AGN), but spend their whole life cycle as CSOs of size ≲500 pc and age ≲5000 yr. The minimum energies needed to produce the radio luminosity and structure in CSO 2s range from ∼10−4 M ⊙ c 2 to ∼7 M ⊙ c 2. We show that the transient nature of most CSO 2s, and their birth rate, can be explained through ignition in the tidal disruption events of stars. We also consider possibilities of tapping the spin energy of the supermassive black hole, and tapping the energy of the accretion disk. Our results demonstrate that CSOs constitute a large family of AGN in which we have thus far studied only the brightest. More comprehensive CSO studies, with higher sensitivity, resolution, and dynamic range, will revolutionize our understanding of AGN and the central engines that power them.
Journal Article
RMTable2023 and PolSpectra2023: Standards for Reporting Polarization and Faraday Rotation Measurements of Radio Sources
Faraday rotation measures (RMs) have been used for many studies of cosmic magnetism, and in most cases having more RMs is beneficial for those studies. This has lead to the development of RM surveys that have produced large catalogs, as well as meta-catalogs collecting RMs from many different publications. However, it has been difficult to take full advantage of all of these RMs, as the individual catalogs have been published in many different places, and in many different formats. In addition, the polarization spectra used to determine these RMs are rarely published, limiting the ability to reanalyze data as new methods or additional observations become available. We propose a standard convention for RM catalogs, RMTable2023, and a standard for source-integrated polarized spectra of radio sources, PolSpectra2023. These standards are intended to maximize the value and utility of these data for researchers and to make them easier to access. To demonstrate the use of the RMTable2023 standard, we have produced a consolidated catalog of 55,819 RMs collected from 42 published catalogs.
Journal Article
Mind tools for managers : 100 ways to be a better boss
\"The manager's must-have guide to excelling in all aspects of the job Mind Tools for Managers helps new and experienced leaders develop the skills they need to be more effective in everything they do. It brings together the 100 most important leadership skills—as voted for by 15,000 managers and professionals worldwide—into a single volume, providing an easy-access solutions manual for people wanting to be the best manager they can be. Each chapter details a related group of skills, providing links to additional resources as needed, plus the tools you need to put ideas into practice. Read beginning-to-end, this guide provides a crash course on the essential skills of any effective manager; used as a reference, its clear organization allows you to find the solution you need quickly and easily. Success in a leadership position comes from results, and results come from the effective coordination of often competing needs: your organization, your client, your team, and your projects. These all demand time, attention, and energy, and keeping everything running smoothly while making the important decisions is a lot to handle. This book shows you how to manage it all, and manage it well, with practical wisdom and expert guidance. Build your ideal team and keep them motivated Make better decisions and boost your strategy game Manage both time and stress to get more done with less Master effective communication, facilitate innovation, and much more Managers wear many hats and often operate under a tremendously diverse set of job duties. Delegation, prioritization, strategy, decision making, communication, problem solving, creativity, time management, project management and stress management are all part of your domain. Mind Tools for Managers helps you take control and get the best out of your team, your time, and yourself\"-- Provided by publisher.
Book
The Karl G. Jansky Very Large Array Sky Survey (VLASS). Science Case and Survey Design
The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with a unique combination of high angular resolution ( 2 5), sensitivity (a 1 goal of 70 Jy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2-4 GHz). The first observations began in 2017 September, and observing for the survey will finish in 2024. VLASS will use approximately 5500 hr of time on the Karl G. Jansky Very Large Array (VLA) to cover the whole sky visible to the VLA (decl. > −40°), a total of 33 885 deg 2 . The data will be taken in three epochs to allow the discovery of variable and transient radio sources. The survey is designed to engage radio astronomy experts, multi-wavelength astronomers, and citizen scientists alike. By utilizing an \"on the fly\" interferometry mode, the observing overheads are much reduced compared to a conventional pointed survey. In this paper, we present the science case and observational strategy for the survey, and also results from early survey observations.
Journal Article
Perspectives on Headquarters-Subsidiary Relationships in the Contemporary MNC
This volume of Research in Global Strategic Management, the first under the new editorship of William Newburry, provides new perspectives on headquarters-subsidiary relationships in the context of the contemporary multinational corporation.
eBook
أدوات ذهنية للمديرين : 100 طريقة لتكون رئيسا أفضل
تعاني الكثير من كتب الإدارة من متلازمة \"الرصاصة الفضية\" حيث تركز على أداة واحدة مهمة كحل لكل مشكلات الإدارة وعلى النقيض من ذلك ويركز هذا الكتاب على حقيقة كونك رئيسا جيدا يرتبط بإجادة العديد من الضوابط وفي حين أن ذلك يبدو أمرا باعثا على القلق فإن هذا الكتاب الذي تسهل قراءته يقدم بصورة رائعة النصائح العملية الخاصة بكيفية إتقان هذه الضوابط على نحو أفضل.
Book
Centers of excellence in multinational corporations
This paper seeks to understand the conditions under which 'centers of excellence' emerge in foreign subsidiaries of multinational firms. We define a center of excellence as an organizational unit that embodies a set of capabilities that has been explicitly recognized by the firm as an important source of value creation, with the intention that these capabilities be leveraged by and/or disseminated to other parts of the firm. Drawing on overlapping research in international business and strategic management, we argue that the formation of centers of excellence is shaped by conditions in the subsidiary's local environment as well as by various aspects of the subsidiary's relationship with other parts of the multinational firm. Based on a survey of 99 foreign units in Canada, our results highlight the fundamental role played by parent firm investment as well as the role of internal and external organizations in the development of subsidiary capabilities. Performance implications of the center of excellence phenomenon are also explored.
Journal Article