A.J. Walton

ORCID: 0000-0002-8110-2230
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About
Contact & Profiles
Research Areas
  • Integrated Circuits and Semiconductor Failure Analysis
  • Advancements in Photolithography Techniques
  • Semiconductor materials and devices
  • Advanced MEMS and NEMS Technologies
  • Advanced Surface Polishing Techniques
  • VLSI and Analog Circuit Testing
  • Advancements in Semiconductor Devices and Circuit Design
  • Copper Interconnects and Reliability
  • Analytical Chemistry and Sensors
  • Electronic Packaging and Soldering Technologies
  • Electrowetting and Microfluidic Technologies
  • Superconducting and THz Device Technology
  • Industrial Vision Systems and Defect Detection
  • 3D IC and TSV technologies
  • Microfluidic and Capillary Electrophoresis Applications
  • Metal and Thin Film Mechanics
  • Manufacturing Process and Optimization
  • Electrochemical Analysis and Applications
  • Heat Transfer and Boiling Studies
  • Heat Transfer and Optimization
  • Advanced biosensing and bioanalysis techniques
  • Acoustic Wave Resonator Technologies
  • Microfluidic and Bio-sensing Technologies
  • Electron and X-Ray Spectroscopy Techniques
  • Force Microscopy Techniques and Applications

University of Edinburgh
2015-2024

University of Kansas
2015-2023

National Microelectronics Institute
2010-2021

Limestone College
2015

Edinburgh Cancer Research
2002-2013

Edinburgh Napier University
2009

Huazhong University of Science and Technology
2009

UK Astronomy Technology Centre
2007

Universities UK
1990-2006

Newcastle University
2004

SCUBA-2 is an innovative 10000 pixel bolometer camera operating at submillimetre wavelengths on the James Clerk Maxwell Telescope (JCMT). The has capability to carry out wide-field surveys unprecedented depths, addressing key questions relating origins of galaxies, stars and planets. With two imaging arrays working simultaneously in atmospheric windows 450 850 microns, vast increase count means that maps sky 100-150 times faster than previous SCUBA instrument. In this paper we present...

10.1093/mnras/sts612 article EN Monthly Notices of the Royal Astronomical Society 2013-03-21

10.1016/j.ijheatfluidflow.2009.03.013 article EN International Journal of Heat and Fluid Flow 2009-05-02

The Gaia Data Release 2 contains the 1st release of radial velocities complementing kinematic data a sample about 7 million relatively bright, late-type stars. Aims: This paper provides detailed description spectroscopic processing pipeline, and approach adopted to derive presented in DR2. Methods: pipeline must perform four main tasks: (i) clean reduce spectra observed with Radial Velocity Spectrometer (RVS); (ii) calibrate RVS instrument, including wavelength, straylight, line-spread...

10.1051/0004-6361/201832836 preprint EN other-oa HAL (Le Centre pour la Communication Scientifique Directe) 2018-08-01

10.1016/j.ijheatmasstransfer.2012.11.038 article EN International Journal of Heat and Mass Transfer 2012-12-23

SCUBA-2 is an innovative 10,000 pixel submillimeter camera due to be delivered the James Clerk Maxwell Telescope in late 2006. The expected revolutionize astronomy terms of ability carry out wide-field surveys unprecedented depths addressing key questions relating origins galaxies, stars and planets. This paper presents update on project with particular emphasis laboratory commissioning instrument. assembly integration will described as well measured thermal performance A summary results...

10.1117/12.671186 article EN Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE 2006-06-14

Microfluidic systems are part of an emerging technology which deals with minute amounts liquids (biological samples and reagents) on a small scale. They fast, compact can be made into highly integrated system to deliver sample purification, separation, reaction, immobilization, labelling, as well detection, thus promising for applications such lab-on-a-chip handheld healthcare devices. Miniaturized micropumps typically consist moving-part component, membrane structure, liquids, often...

10.1088/0960-1317/19/5/054001 article EN Journal of Micromechanics and Microengineering 2009-04-14

This paper reports results of the simulation an optical phase modulator. The proposed modulator consists elongated p-i-n structure fabricated in a silicon-on-insulator material such as SIMOX. It utilizes free-carrier effect to produce desired refractive index change single-mode rib waveguide. MEDICI two-dimensional semiconductor device package has been employed optimize overlap between injected free carriers and propagating guided mode. Although is designed support single mode, it measures...

10.1109/50.317527 article EN Journal of Lightwave Technology 1994-01-01

The development of an implantable system designed to deliver drug doses in a controlled manner over extended time period is reported. Key performance parameters are the physical size, power consumption and also ability perform wireless communications enable be externally interrogated. has been facilitate transfer, which very important for miniaturisation as it removes need battery.

10.1049/iet-nbt:20070022 article EN IET Nanobiotechnology 2007-08-31

This paper presents a robust anodic Ta <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> dielectric as an alternative insulator for fabricating low-voltage electrowetting on (EWOD) systems. Previously reported EWOD technologies require high-temperature processes ( > 435degC), which unlike this room temperature technology, are not compatible with standard copper and aluminum integrated...

10.1109/jmems.2008.2006827 article EN Journal of Microelectromechanical Systems 2008-11-12

Acoustic streaming of ink particles inside a water microdroplet generated by surface acoustic wave (SAW) has been studied numerically using finite volume numerical method and these results have verified experimental measurements. Effects SAW excitation frequency, droplet volume, radio-frequency (RF) power are investigated, it shown that frequency influences the attenuation length, lSAW, hence energy absorbed liquid. It also observed an increase generally enhances behavior. However, when...

10.1063/1.4758282 article EN Journal of Applied Physics 2012-10-15

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. Alghane, Y. Q. Fu, B. X. Chen, Li, P. Desmulliez, A. J. Walton; Streaming phenomena in microdroplets induced by Rayleigh surface acoustic wave. Appl. Phys. 1 June 2011; 109 (11): 114901. https://doi.org/10.1063/1.3586040 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers...

10.1063/1.3586040 article EN Journal of Applied Physics 2011-06-01

Hypoxia commonly occurs within tumours and is a major cause of radiotherapy resistance. Clinical outcomes could be improved by locating selectively increasing the dose delivered to hypoxic regions. Here we describe miniature implantable sensor for real-time monitoring tissue oxygenation that enable this novel treatment approach implemented. The uses solid-state electrochemical cell was microfabricated at wafer level on silicon substrate, includes an integrated reference electrode electrolyte...

10.1016/j.sbsr.2020.100375 article EN cc-by Sensing and Bio-Sensing Research 2020-08-11

The concept of local design rules is introduced. These are integrated circuit (IC) layout that define the optimum feature size and spacing in relation to surrounding geometry used increase yield ICs. impact these on performance reliability ICs discussed. Algorithms enable automatic application track displacement, width, contact IC presented. Simulation results provided for some examples.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

10.1109/43.177399 article EN IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 1992-01-01

An MRSA assay requiring neither labeling nor amplification of target DNA has been developed. Sequence specific binding fragments bacterial genomic is detected at femtomolar concentrations using electrochemical impedance spectroscopy (EIS). This achieved systematic optimisation probe chemistry (PNA self-assembled monolayer film on gold electrode), electrode structure (the size and nature the chemical spacer) fragmentation, as these are found to play an important role in performance. These...

10.1039/c3an01319g article EN The Analyst 2013-01-01

The manipulation of ribosomal RNA (rRNA) extracted from E. coli cells by dielectrophoresis (DEP) has been demonstrated over the range 3 kHz–50 MHz using interdigitated microelectrodes. Quantitative measurement total internal reflection fluorescence microscopy time dependent collection indicated a positive DEP response characterized plateau between kHz and 1 followed decrease in at higher frequencies. Negative was observed above 9 MHz. below is described Clausius–Mossotti model corresponds to...

10.1063/1.3604395 article EN Biomicrofluidics 2011-06-01

Overcoming friction while generating useful torque is a challenge for micro engines. Here we report the development of microscale engine that utilizes transition boiling as mode propulsion and Leidenfrost effect friction-less bearing. The shows significantly improved performance compared to engine, which uses vapor entrainment mechanism (up 3 orders magnitude higher efficiency). We characterize with temperature develop an analytical model compare experimental observations. Our results...

10.1016/j.applthermaleng.2023.120565 article EN cc-by Applied Thermal Engineering 2023-04-23

SCUBA-2 is a second generation, wide-field submillimetre camera under development for the James Clerk Maxwell Telescope. With over 12,000 pixels, in two arrays, will map sky up to 1000 times faster than current SCUBA instrument same signal-to-noise. Many areas of astronomy benefit from such highly sensitive survey instrument: studies galaxy formation and evolution early Universe understanding star planet our own Galaxy. Due be operational 2006, also act as "pathfinder" new generation...

10.1117/12.459152 article EN Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE 2003-02-01
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