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18 results on '"Ng, Kwok-wai"'

3. Direct observation of the Mott gap in strontium iridate with a scanning tunneling microscope

Author

Nichols, John, Bray-Ali, Noah, Cao, Gang, and Ng, Kwok-Wai

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The single-layer Mott insulator strontium iridate Sr$_2$IrO$_4$ was studied using a scanning tunneling microscope. This measurement technique is unique due to the transport properties of this Mott insulator allowing tunneling measurements to be performed, even at cryogenic temperatures. We obtained high-resolution images of the sample surface and the differential tunneling conductance at different cryogenic temperatures. The differential conductance is a direct measurement of the local electronic density of states which provided an insulating gap consistent with optical conductivity, angle resolved photoemission spectroscopy and resonant inelastic x-ray scattering (RIXS) experiments. The observed widths of these features is broader than predicted by the Slater approximation and narrower than predicted by dynamical mean field theory. Additionally, the observed density of states due to magnetic fluctuations is found in the derivative of the differential conductance and is consistent with results from Raman scattering and RIXS. At low temperatures, additional low-energy features were observed, suggesting a change in the dispersion of the collective magnetic excitations, which is consistent with the magnetic susceptibility., Comment: 5 pages, 4 figures, submitted to Phys. Rev. B

Published
2013
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18. On-line real-time information system in manufacturing -- key to survive?.

Author

Leung, Shui-kei., Ng, Kwok-wai., Chinese University of Hong Kong Graduate School. Division of Business Administration., Leung, Shui-kei., Ng, Kwok-wai., and Chinese University of Hong Kong Graduate School. Division of Business Administration.

Abstract

by Leung, Brain Shui-kei, Ng, Timmy Kwok-wai., Thesis (M.B.A.)--Chinese University of Hong Kong, 1990., Bibliography: leaves 72-73., p.ii, TABLE OF CONTENTS --- p.iii, LIST OF ILLUSTRATIONS --- p.vi, LIST OF TABLES --- p.vii, ACKNOWLEDGEMENTS --- p.viii, Chapter, Chapter I. --- INTRODUCTION --- p.1, Research Methodology --- p.4, Chapter II. --- FACTORY-FLOOR COMPUTERIZATION OF ELECTRONICS MANUFACTURING INDUSTRY IN HONG KONG --- p.5, An Overview of the Worldwide Electronics Manufacturing Industry --- p.5, Electronics Manufacturing Industry in Hong Kong --- p.11, Production Control Problems in Electronics Manufacturing Firms in Hong Kong --- p.13, The Survey --- p.15, The Solution: On-Line Real-Time Information System --- p.24, Chapter III. --- A STUDY OF THE APPLICABILITY OF THE SUGGESTED ON-LINE REAL-TIME INFORMATION SYSTEM TO A MEDIUM SIZED ELECTRONICS MANUFACTURING FIRM IN HONG KONG, The Company --- p.29, A Study of the Existing Production Controlling System --- p.30, Problems with the Existing Production Controlling System --- p.31, """OLRTIS""" --- p.35, The Design of OLRTIS --- p.36, Implementation of the Proposed OLRTIS --- p.47, Cost / Benefits Analysis --- p.49, Chapter IV. --- PRACTICAL CONSIDERATION --- p.56, Top Management Attitude --- p.56, Training of Staff and Workers --- p.57, Acceptance/Resistance of the New System --- p.57, "Garbage In, Garbage Out" --- p.59, Impact of the New System on Management Organization --- p.59, Human Resources --- p.60, Chapter V. --- CONCLUSION --- p.61, APPENDIXES --- p.63, BIBLIOGRAPHY --- p.72, http://library.cuhk.edu.hk/record=b5886344, Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Published
1990

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