Conrad Johnston

ORCID: 0000-0003-3482-9792
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Research Areas
  • Scientific Computing and Data Management
  • Machine Learning in Materials Science
  • Smart Materials for Construction
  • Radioactive element chemistry and processing
  • Concrete and Cement Materials Research
  • Graphite, nuclear technology, radiation studies
  • Catalysis and Oxidation Reactions
  • Bone health and osteoporosis research
  • Advanced Data Storage Technologies
  • Nuclear reactor physics and engineering
  • Advanced Thermoelectric Materials and Devices
  • Genetic Syndromes and Imprinting
  • Bipolar Disorder and Treatment
  • Electrolyte and hormonal disorders
  • ZnO doping and properties
  • Thermal properties of materials
  • Medical Imaging Techniques and Applications
  • Hygrothermal properties of building materials
  • Data Quality and Management
  • Crystal Structures and Properties
  • Software Engineering Techniques and Practices
  • Advanced Memory and Neural Computing
  • Thermal Radiation and Cooling Technologies
  • Semiconductor materials and interfaces
  • Semiconductor materials and devices

Microsoft (United States)
2024

Pacific Northwest National Laboratory
2022-2024

Battelle
2023

Queen's University Belfast
2017-2021

École Polytechnique Fédérale de Lausanne
2020

Victoria University of Wellington
2001

Indiana University – Purdue University Indianapolis
1972-1996

Indiana University School of Medicine
1966-1972

University Medical Center
1972

University Hospital and Clinics
1972

Abstract The ever-growing availability of computing power and the sustained development advanced computational methods have contributed much to recent scientific progress. These developments present new challenges driven by sheer amount calculations data manage. Next-generation exascale supercomputers will harden these challenges, such that automated scalable solutions become crucial. In years, we been developing AiiDA (aiida.net), a robust open-source high-throughput infrastructure...

10.1038/s41597-020-00638-4 article EN cc-by Scientific Data 2020-09-08

It has been proposed previously that the metabolic defect in pseudohypoparathyroidism which accounts for parathyroid hormone unresponsiveness is an absence or abnormal form of adenyl cyclase system kidney and presumably bone. To determine whether there associated response mechanism to cyclic adenosine 3′,5′-monophosphate (cyclic AMP), effects extract (PTE), dibutyryl AMP were compared patients with either surgical hypoparathyroidism pseudohypoparathyroidism. PTE both increased serum urinary...

10.1172/jci106876 article EN Journal of Clinical Investigation 1972-04-01

Abstract The prediction of material properties based on density-functional theory has become routinely common, thanks, in part, to the steady increase number and robustness available simulation packages. This plurality codes methods is both a boon burden. While providing great opportunities for cross-verification, these packages adopt different methods, algorithms, paradigms, making it challenging choose, master, efficiently use them. We demonstrate how developing common interfaces workflows...

10.1038/s41524-021-00594-6 article EN cc-by npj Computational Materials 2021-08-19

Abstract Functional materials that enable many technological applications in our everyday lives owe their unique properties to defects are carefully engineered and incorporated into these during processing. However, optimizing characterizing is very challenging practice, making computational modelling an indispensable complementary tool. We have developed automated workflow code accelerate calculations (AiiDA-defects), which utilises the AiiDA framework, a robust open-source high-throughput...

10.1088/2516-1075/ace014 article EN cc-by Electronic Structure 2023-06-01

The lattice dynamics of potassium dihydrogen phosphate (KDP) and its deuterated analog DKDP was studied via first-principles DFT calculations. A thorough assessment the quality a wide range functionals supplemented with approximate inclusion quantum nuclear effects indicated that nonlocal van der Waals functional vdW-DF [M. Dion et al., Phys. Rev. Lett. 92, 246401 (2004); J. Klime\ifmmode \check{s}\else \v{s}\fi{} B 83, 195131 (2011)] produces best agreement structural data for both...

10.1103/physrevb.98.104108 article EN Physical review. B./Physical review. B 2018-09-28

This work investigates, using density functional theory (DFT), the localization of electrons and holes produced by irradiation in LiF crystals doped with Ti. We show that Ti can act either as an electron trap, when located at interstitial position lattice, or a trap for substituting Li atom. also observe excess is localized p-state while hole localizes d-state. The this state substitutes supported results reported literature where it was assumed substitute trap. defect energy levels obtained...

10.1016/j.radmeas.2024.107114 article EN cc-by Radiation Measurements 2024-04-07

The discovery of new catalysts is essential for the design and more efficient chemical processes in order to transition a sustainable future. We introduce an AI-guided computational screening framework unifying linguistic reasoning with quantum-chemistry based feedback from 3D atomistic representations. Our approach formulates catalyst as uncertain environment where agent actively searches highly effective via iterative combination large language model (LLM)-derived hypotheses graph neural...

10.48550/arxiv.2402.10980 preprint EN arXiv (Cornell University) 2024-02-15

LiF doped with Mg and Ti is the most widely used thermoluminescent (TL) dosimeter for a large variety of applications. It has been argued that dopant important defect in TL process. Besides common F-centre defects LiF, optical absorption measurements have suggested presence Mg-related bands at 380 nm (3.26 eV), 310 (4.0 eV) when LiF:Mg exposed to ionizing radiation, whose origin not yet well understood. This work presents an investigation role induced by interstitials through electronic...

10.1088/1361-648x/aaee62 article EN Journal of Physics Condensed Matter 2018-11-05

The results of slow-release sodium fluoride (SR-NaF) treatment in two nonrandomized trials involving 65 patients with postmenopausal osteoporosis from the primary site and 121 collaborative sites were compared those obtained 54 treated 56 taking placebo a randomized controlled trial. Spinal fracture data analyzed separately mild to moderate bone loss lumbar spine (baseline L2-L4 density [BD] > or = 65% young normal) severe (BD < 65%). Since demographic similar among fluoride-treated three at...

10.1002/jbmr.5650110204 article EN Journal of Bone and Mineral Research 1996-02-01

The transformative impact of modern computational paradigms and technologies, such as high-performance computing (HPC), quantum computing, cloud has opened up profound new opportunities for scientific simulations. Scalable chemistry is one beneficiary this technological progress. main focus paper on the performance various chemical formulations, ranging from low-order methods to high-accuracy approaches, implemented in different packages libraries, NWChem, NWChemEx, Predictive Methods...

10.1063/5.0226437 article EN cc-by The Journal of Chemical Physics 2024-10-21

JUDD, DONALD R. M.D.; HEMBURGER, IUVIN M.D; JOHNSTON, CONRAD JR. M.D. Author Information

10.1097/00000658-196612000-00019 article CY Annals of Surgery 1966-12-01

Abstract Cement is an inexpensive and relatively easily manageable material that used as a last barrier for nuclear waste disposal. Under these conditions, the cement in contact with low radiation doses, but there distinct possibility of being contaminated radioactive products. Of particular concern medium lived half-life product $$\mathrm {{}^{90}Sr}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>90</mml:mn> </mml:msup>...

10.1140/epjd/s10053-021-00202-8 article EN cc-by The European Physical Journal D 2021-09-01

This paper reviews the value of prototypes and proposes a tool called Panorama that links with other artefacts created during software development process. The we consider have been by either HCI specialists or engineers development. facilitates sharing aims to increase quality communication between throughout maintenance phases. We look at variety including static (bitmaps sketches, screen dumps, digital photographs) dynamic (derived from UIML specifications). investigate feasibility...

10.1145/2331812.2331816 article EN 2001-01-01

Functional materials that enable many technological applications in our everyday lives owe their unique properties to defects are carefully engineered and incorporated into these during processing. However, optimizing characterizing is very challenging practice, making computational modelling an indispensable complementary tool. We have developed automated workflow code accelerate calculations (AiiDA-defects), which utilises the AiiDA framework, a robust open-source high-throughput...

10.48550/arxiv.2303.12465 preprint EN cc-by-nc-sa arXiv (Cornell University) 2023-01-01

Abstract Buildings are responsible for a considerable fraction of the energy wasted globally every year, and as result, excess carbon emissions. While heat is lost directly in colder months climates, resulting increased heating loads, hot climates cooling ventilation required. One avenue towards improving efficiency buildings to integrate thermoelectric devices materials within fabric building exploit temperature gradient between inside outside do useful work. Cement-based ubiquitous modern...

10.1088/2053-1591/acf6fb article EN cc-by Materials Research Express 2023-09-01

Buildings are responsible for a considerable fraction of the energy wasted globally every year, and as result, excess carbon emissions. While heat is lost directly in colder months climates, resulting increased heating loads, hot climates cooling ventilation required. One avenue towards improving efficiency buildings to integrate thermoelectric devices materials within fabric building exploit temperature gradient between inside outside do useful work. Cement-based ubiquitous modern present...

10.48550/arxiv.2211.17128 preprint EN other-oa arXiv (Cornell University) 2022-01-01
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