Alexander Petkov

ORCID: 0000-0002-9220-9789
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About
Contact & Profiles
Research Areas
  • Ga2O3 and related materials
  • ZnO doping and properties
  • Advanced Photocatalysis Techniques
  • Dental materials and restorations
  • Advanced Vision and Imaging
  • Bone Tissue Engineering Materials
  • Video Surveillance and Tracking Methods
  • Electronic and Structural Properties of Oxides
  • Orthodontics and Dentofacial Orthopedics
  • Advanced Computational Techniques and Applications
  • Safety Systems Engineering in Autonomy
  • Metal and Thin Film Mechanics
  • Titanium Alloys Microstructure and Properties
  • Distributed and Parallel Computing Systems
  • Semantic Web and Ontologies
  • Formal Methods in Verification
  • Thermal Expansion and Ionic Conductivity
  • Model-Driven Software Engineering Techniques
  • Image Processing Techniques and Applications
  • Magnetic and transport properties of perovskites and related materials
  • Embedded Systems Design Techniques
  • Parallel Computing and Optimization Techniques
  • Laser Material Processing Techniques
  • Advanced Database Systems and Queries
  • Simulation and Modeling Applications

University of Bristol
2021-2024

University of Oxford
2022

Northrop Grumman (United States)
2022

United States Air Force Research Laboratory
2022

Argonne National Laboratory
2022

University of Exeter
2020

Integration of β-Ga2O3 with high thermal conductivity materials such as diamond has been considered due to β-Ga2O3's low and anisotropic conductivity, reaching only 27 W m–1 K–1. However, the effect crystallographic orientation on interface resistance not studied extensively, which is relevant for potential device architectures. In this work, we use molecular dynamics simulations investigate crystal orientation-dependent boundary (TBR) across van der Waals bonded diamond–β-Ga2O3 ionicly...

10.1063/5.0132859 article EN cc-by Applied Physics Letters 2023-01-16

Multiforce orthodontic archwires are thermodynamic wires made of nickel-titanium alloy (Ni-Ti). They release biologically tolerable forces along their length, progressively increasing from front to back. The frontal archwires' segments distribute the weakest force: premolar, greater, and molar, greatest. aim present study was determine influence clinical use on mechanical properties two types multi-force (TriTanium®, American orthodontics; Bio-Active®, GC) with dimensions 0.016 × 0.022...

10.3390/ma16020483 article EN Materials 2023-01-04

β-Ga2O3 was suggested to have excellent irradiation hardness which makes β-Ga2O3-based devices extremely attractive for nuclear and space applications. To discern the fundamental nano-scale structural changes with irradiation, an in situ experiment a transmission electron microscope carried out using 400 keV Ar ions of fluences up 8 × 1015 cm−2 (equivalent four displacements per atom). Contrary previous works, indicate phase transition into κ polymorph, structure found remain intact...

10.1063/5.0120089 article EN cc-by Applied Physics Letters 2022-10-24

Abstract Heterostructures of Ga $$_2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mn>2</mml:mn> </mml:mmultiscripts> </mml:math> O $$_3$$ <mml:mn>3</mml:mn> with other materials such as Si, SiC or diamond, are a possible way addressing the low thermal conductivity and lack p-type doping for device applications, well improving reliability. In this work we study electrical properties –SiO heterostructures. Here, thin-film gallium oxide...

10.1038/s41598-023-30638-4 article EN cc-by Scientific Reports 2023-03-01

Multiforce nickel-titanium (NiTi) orthodontic archwires release progressively increasing forces in a front-to-back direction along their length. The properties of NiTi depend on the correlation and characteristics microstructural phases (austenite, martensite intermediate R-phase). From clinical manufacturing point view, determination austenite finish (Af) temperature is greatest importance, as austenitic phase, alloy most stable exhibits final workable form. main purpose using multiforce to...

10.3390/ma16103776 article EN Materials 2023-05-17

Abstract: Rationale. Object tracking has significance in many applications ranging from control of unmanned vehicles to autonomous monitoring specific situations and events, especially when providing safety for patients with certain adverse conditions such as epileptic seizures. Conventional methods face challenges, the need dedicated attached devices or tags, influence by high image noise, complex object movements, intensive com-putational requirements. We have developed earlier...

10.20944/preprints202403.0747.v1 preprint EN 2024-03-13

Photoelectrochemical water splitting is a promising method of clean hydrogen production for green energy uses. Here, we report on tin-based oxide perovskite combined with an overlayer that shows enhanced bifunctional and oxygen evolution. In our first-principles study perovskites, based upon density functional theory, investigate how the formation surface affects electronic properties these materials. We show best candidate, SrSnO3, possesses overpotentials 0.75 0.72 eV, respectively, which...

10.1021/acs.jpclett.0c00964 article EN cc-by The Journal of Physical Chemistry Letters 2020-04-30

Gallium Oxide (Ga<sub>2</sub>O<sub>3</sub>) has attracted great attention due to its predicted high critical electric field, and consequentially expectation have impact for voltage power devices. However, from a device design reliability perspective, it certain drawbacks: Ga<sub>2</sub>O<sub>3</sub> relatively low thermal conductivity, potentially causing excessively temperatures, accelerating degradation; usable p-doping is unavailable, preventing the use of advanced devices designs such as...

10.1117/12.3013691 article EN 2024-03-15

Rationale. Object tracking has significance in many applications ranging from control of unmanned vehicles to autonomous monitoring specific situations and events, especially when providing safety for patients with certain adverse conditions such as epileptic seizures. Conventional methods face challenges, the need dedicated attached devices or tags, influence by high image noise, complex object movements, intensive computational requirements. We have developed earlier computationally...

10.3390/info15060296 article EN cc-by Information 2024-05-22

This study aimed to characterize and compare the latest generation multi-force Bio-active™ orthodontic archwires determine if there is a change in their physicochemical mechanical properties during treatment. The characterization of was done by X-ray diffraction (XRD), scanning electron microscopy, energy-dispersive spectroscopy laser-induced breakdown spectroscopy. A modified dynamic nanoindentation method with depth control used properties. Statistical analysis one-way variance (ANOVA)....

10.1080/13102818.2021.1964381 article EN cc-by Biotechnology & Biotechnological Equipment 2021-01-01

A method of sequential microcode compaction for architectures containing transient data resources is discussed.A theoretical apparatus, allowing the identification microoperation groups requiring synchronization according to their as well correcposnding suggested.An algorithm, separating resulting from in microarchitectures also discussed.

10.1145/378741.378753 article EN ACM SIGMICRO newsletter/SIGMICRO newsletter/SIGMICRO, TCMICRO newsletter 1986-12-01
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