WorldCat Identities


Works: 7 works in 7 publications in 1 language and 28 library holdings
Roles: Author
Classifications: LB2341.8.G7, 378
Publication Timeline
Most widely held works by J SMEDLEY

1 edition published in 2006 in English and held by 6 WorldCat member libraries worldwide

We report on recent progress toward development of secondary emission ''amplifiers'' for photocathodes. Secondary emission gain of over 300 has been achieved in transmission mode and emission mode for a variety of diamond samples. Techniques of sample preparation, including hydrogenation to achieve negative electron affinity (NEA), have been adapted to this application

1 edition published in 2005 in English and held by 6 WorldCat member libraries worldwide

We present the results of our investigation of lead and niobium as suitable photocathode materials for superconducting RF injectors. Quantum efficiencies (QE) have been measured for a range of incident photon energies and a variety of cathode preparation methods, including various lead plating techniques on a niobium substrate. The effects of operating at ambient and cryogenic temperatures and different vacuum levels on the cathode QE have also been studied

1 edition published in 2005 in English and held by 6 WorldCat member libraries worldwide

We present the design and experimental progress on the diamond secondary emitter as an electron source for high average power injectors. The design criteria for average currents up to 1 A and charge up to 20 nC are established. Secondary Electron Yield (SEY) exceeding 200 in transmission mode and 50 in emission mode have been measured. Preliminary results on the design and fabrication of the self contained capsule with primary electron source and secondary electron emitter will also be presented
Nb-Pb Superconducting RF Gun( )

1 edition published in 2006 in English and held by 6 WorldCat member libraries worldwide

We report on the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead, as compared to other superconducting metals. The concept, mentioned in a previous paper, follows the attractive approach of all niobium superconducting RF-gun as it has been proposed by the BNL group. Measured values of quantum efficiency for lead at various photon energies, analysis of recombination time of photon-broken Cooper pairs for lead and niobium, and preliminary cold test results are discussed in this paper
Higher education management and operational research : demonstrating new practices and metaphors by Gary Bell( Book )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Higher education in the UK operates in a rapidly changing and highly complex environment. Universities need to adapt quickly to this environment and managers must begin to explore 'new angles' and approaches in addressing the challenges they are now facing. This book offers a tool box of metaphors and associative Operational Research (OR) approaches. Metaphors are a powerful 'way of seeing' but also 'a way of not seeing'. Furthermore, the OR discipline has significantly evolved over the last 30 years which has led to the emergence of three distinctive intellectual areas, namely Hard OR, Soft OR and Methodological Pluralism OR. Drawing on these intellectual areas and on the experience of educational and OR practitioners, the book highlights the use of various OR approaches to a variety of complex and uncertain problems encountered in higher education management. The book aims to explore 'new perspectives' in HE management thinking and to describe and illustrate the use of OR methodologies, methods and techniques in helping HE managers to make informed management decisions. [Back cover]
Laser Ignition of Nitramine Composite Propellants and Crack Propagation and Branching in Burning Solid Propellants( )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

Two major tasks performed during the report period of investigation were: (i) laser ignition of nitramine-based composite propellants using a high- powered CO2 laser in (ii) crack propagation and branching in burning solid propellants. The laser ignition of a series of RDX-based composite propellants was studied theoretically and experimentally. A comprehensive model for the radiative ignition of the nitramine composite propellants was formulated. The theoretical model was solved numerically. A radiative ignition test setup employing a high-powered CO2 laser was designed and constructed to study ignition characteristics of a series of RDX-based nitramine composite propellants. Interactions between the infrared laser beam and nitramine composite propellants revealed a number of interesting processes. The laser ignition of composite propellants involves many complex thermophysiochemical processes including gasification, initiation of a luminous flame, propagation of the flame, and chemical reactions near the sample surface as well as heat conduction in solid phases. In general, the delay time based upon the onset of light emission decreases monotonically with the increase of incident laser energy flux. Keywords:Ignition, Carbon dioxide laser, Nitramine, Composite propellants, Thermal decomposition, Reaction mechanisms, Ignition delay, Radiation ignition, Crack propagation, Crack branching, Interrupted burning, Depressurization, Extinguishment
Audience Level
Audience Level
  Kids General Special  
Audience level: 0.76 (from 0.27 for Higher edu ... to 0.99 for Laser Igni ...)