565 research outputs found

    Toward Discerning a New Imagination: Missional Leadership for the Transformation of a Denominational Agency

    Get PDF
    The purpose of this project is to explore self-leadership issues and adaptive challenges the executive director of Christian Reformed Home Missions (CRHM) must address to provide helpful and transformative leadership within the Christian Reformed Church in North America (CRCNA). An action-learning project is constructed from a missional-change perspective to test, assess, discern, and identify critical issues of executive leadership in leading a denominational mission agency into a journey of missional transformation. It is framed around a question: What are the critical skills, capacities, and habits required for an executive leader to lead an agency from providing denominational programming to enabling missional engagement with churches in their local contexts? Part One provides the leadership context by naming ministry challenges. The Missional Network Exec Leader 360 Survey tool is used to establish a baseline reflection on the executive director’s current leadership and learning. Part Two engages theological reflection by discussing theological themes and theoretical frameworks pertinent in developing missional imagination and organizational culture change. Part Three reports on the design, development, and key learning of a thirteen-month action-learning project. It concludes by proposing an action plan addressing the identified challenges in the areas of cultivating missional imagination, managing adaptive and technical work, forming plurality of leadership within CRHM, and leading “up and across” in the CRCNA. Six areas of key learning points are significant discoveries that may assist those seeking to initiate and lead missional change processes in church systems: Managing change; Honoring the past and moving beyond the past; Communicating well; Continuing balcony reflections for awareness and understanding; Addressing adaptive and technical challenges; and Cultivating spiritual practices. Possible topics for further research that come out of this project are establishing mission order, forming leadership community as communitas, and exploring the possibility of becoming Abbot and Abbesses. Content Reader: Alan J. Roxburgh, DMi

    Reconstruction of plasma density profiles by measuring spectra of radiation emitted from oscillating plasma dipoles

    Get PDF
    We suggest a new method for characterising non-uniform density distributions of plasma by measuring the spectra of radiation emitted from a localised plasma dipole oscillator excited by colliding electromagnetic pulses. The density distribution can be determined by scanning the collision point in space. Two-dimensional particle-in-cell simulations demonstrate the reconstruction of linear and nonlinear density profiles corresponding to laser-produced plasma. The method can be applied to a wide range of plasma, including fusion and low temperature plasmas. It overcomes many of the disadvantages of existing methods that only yield average densities along the path of probe pulses, such as interferometry and spectroscopy

    Laboratory Astrophysics Using Intense Ion and Photon Beams Generated by Large-Scale Accelerator Facilities in Korea

    Get PDF
    Several large-scale accelerator facilities are operational or under construction in Korea, such as the Korea Multi-purpose Accelerator Complex (KOMAC), the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL), and the Rare Isotope Science Project (RISP). These accelerator projects open up new opportunities in basic science researches in Korea, and provide excellent platforms particularly for laboratory astrophysics..

    Simultaneous repolarization of two 10-Gb/s polarization-scrambled wavelength channels using a mutual-injection-locked laser diode

    Get PDF
    Author name used in this publication: W. H. ChungAuthor name used in this publication: P. K. A. WaiAuthor name used in this publication: H. Y. TamAuthor name used in this publication: M. S. Demokan2002-2003 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

    Laboratory Astrophysics Using Intense Ion and Photon Beams Generated by Large-Scale Accelerator Facilities in Korea

    Get PDF
    Several large-scale accelerator facilities are operational or under construction in Korea, such as the Korea Multi-purpose Accelerator Complex (KOMAC), the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL), and the Rare Isotope Science Project (RISP). These accelerator projects open up new opportunities in basic science researches in Korea, and provide excellent platforms particularly for laboratory astrophysics..

    Beam envelope calculations in general linear coupled lattices

    Get PDF
    The envelope equations and Twiss parameters (beta and alpha) provide important bases for uncoupled linear beam dynamics. For sophisticated beam manipulations, however, coupling elements between two transverse planes are intentionally introduced. The recently developed generalized Courant-Snyder theory offers an effective way of describing the linear beam dynamics in such coupled systems with a remarkably similar mathematical structure to the original Courant-Snyder theory. In this work, we present numerical solutions to the symmetrized matrix envelope equation for b which removes the gauge freedom in the matrix envelope equation for w. Furthermore, we construct the transfer and beam matrices in terms of the generalized Twiss parameters, which enables calculation of the beam envelopes in arbitrary linear coupled systems. (C) 2015 AIP Publishing LLC.open1

    Commissioning of the electron injector for the AWAKE experiment

    Get PDF
    The advanced wakefield experiment (AWAKE) at CERN is the first proton beam-driven plasma wakefield acceleration experiment. The main goal of AWAKE RUN 1 was to demonstrate seeded self-modulation (SSM) of the proton beam and electron witness beam acceleration in the plasma wakefield. For the AWAKE experiment, a 10-meter-long Rubidium-vapor cell together with a high-power laser for ionization was used to generate the plasma. The plasma wakefield is driven by a 400 GeV/c proton beam extracted from the super proton synchrotron (SPS), which undergoes a seeded self-modulation process in the plasma. The electron witness beam used to probe the wakefields is generated from an S-band RF photo-cathode gun and then accelerated by a booster structure up to energies between 16 and 20 MeV. The first run of the AWAKE experiment revealed that the maximum energy gain after the plasma cell is 2 GeV, and the SSM mechanism of the proton beam was verified. In this paper, we will present the details of the AWAKE electron injector. A comparison of the measured electron beam parameters, such as beam size, energy, and normalized emittance, with the simulation results was performed

    Generalized Kapchinskij-Vladimirskij Distribution and Envelope Equation for High-Intensity Beams in a Coupled Transverse Focusing Lattice

    Get PDF
    In an uncoupled lattice, the Kapchinskij-Vladimirskij (KV) distribution function first analyzed in 1959 is the only known exact solution of the nonlinear Vlasov-Maxwell equations for high-intensity beams including self-fields in a self-consistent manner. The KV solution is generalized here to high-intensity beams in a coupled transverse lattice using the recently developed generalized Courant-Snyder invariant for coupled transverse dynamics. This solution projects to a rotating, pulsating elliptical beam in transverse configuration space, determined by the generalized matrix envelope equationclose151

    Daylighting evaluation and optimisation of window to wall ratio for lecture theatre in the tropical climate

    Get PDF
    A base case model is a more potent dose for applied research; the passive architectural design for sustainability requires optimised experiments. However, experimenting with physical developments require construction and deconstruction until they achieved the optimal scenario. These wastes resources and time; hence, base models' development as useful instruments in the optimisation design process is desirable. Lecture theatres in universities have no specific design model whereby optimising one may not apply to the other. Therefore, this research evaluated a base model for lecture theatre regarding spatial configuration, daylighting potentials, and optimised window-to-wall ratio (WWR) for tropical daylighting. A study of ten existing lecture theatres in eight universities within eight states in Nigeria's hot-humid climate was analysed descriptively for the base model. The study employed Simulations with IES-VE software. The daylighting performance analysis adopted the daylighting rule of thumb, daylight factor, work plane illuminance (WPI), and WPI ratio. The results show that a typical lecture theatre in the study area has a dimensional configuration of 12×20 m floor plan, 6 m ceiling height, and a window wall ratio (WWR) of 13%. In the deduced base model, 4H was required for adequate daylighting against the thumb's 2.5 H daylighting rule. The research concludes a low window-wall ratio with poor daylighting quality and quantities in the base model; therefore, it implies that the daylighting was not a criterion in the designs. However, the experiment revealed a progression in daylighting performance with an increase in WWR from the base case until 30% WWR. Beyond that, there was a decline in the daylighting performance. Therefore, 30% WWR was optimal for daylighting performance in lecture theatre retrofitting within the tropical climate
    corecore