A5082493122- Graphene research and applications
- Neuroscience and Neural Engineering
- Quantum and electron transport phenomena
- Muscle activation and electromyography studies
- Advancements in Battery Materials
- Topological Materials and Phenomena
- EEG and Brain-Computer Interfaces
- Low-power high-performance VLSI design
- Advanced Sensor and Energy Harvesting Materials
- Orthopedic Infections and Treatments
- Tactile and Sensory Interactions
- Magnetic properties of thin films
- Orthopaedic implants and arthroplasty
- Total Knee Arthroplasty Outcomes
- Advanced Memory and Neural Computing
- 2D Materials and Applications
- Maternal Mental Health During Pregnancy and Postpartum
- Botulinum Toxin and Related Neurological Disorders
- Tribology and Wear Analysis
- 3D Printing in Biomedical Research
- Advancements in Semiconductor Devices and Circuit Design
- Diamond and Carbon-based Materials Research
- Graphene and Nanomaterials Applications
- Semiconductor materials and devices
- Molecular Junctions and Nanostructures
University of Copenhagen
2021
Aalborg University
1998-2019
Cuff electrodes for recording of the electro-neurogram from peripheral nerves were introduced by Hoffer [1974] and Stein, et al. [1975]. The cuffs used to obtain higher signal amplitudes than previously possible, at least in chronic recordings, decrease pick-up noise, especially muscles. are relatively stable long-term but stability has never been quantified terms input-output relationships; i.e., responses repeatable stimuli over time. Moreover. relationship between nerve damage...
Properties of nerve cuff recording electrodes were analyzed. Tripolar have to be described essentially different for (propagating) signals inside the cuff, and electrical muscle activity stimulus artifacts arising from sources outside cuff. It was experimentally shown that originating are differently much stronger influenced by addition a balancing resister outer than signal.
Commensurability oscillations in the magnetotransport of periodically patterned systems, emerging from interplay cyclotron orbit and pattern periodicity, are a benchmark mesoscopic physics electron gas systems. Exploiting similar effects 2D materials would allow exceptional control behaviour, but is hindered by requirement to maintain ballistic transport over large length scales. Recent experiments have overcome this obstacle observed distinct magnetoresistance commensurability peaks for...
Circularly symmetric graphene nanostructures exist in the form of rings, dots, and antidots. For realistic structure sizes, atomistic studies typically become prohibitively demanding. Analytical results, however, can be found within Dirac-equation approach even presence a perpendicular magnetic field. We model nanostructure confinement by using circularly mass term analyze influence geometry, field, on eigenstates. Excellent agreement with models for small structures is demonstrated. In...
Inspired by recent experimental realizations of monolayer Fe membranes in graphene perforations, we perform ab initio calculations monolayers and embedded order to assess their structural stability magnetization. We demonstrate that has a larger spin magnetization per atom than bulk exhibit comparable Fe. find free-standing is structurally more stable triangular lattice compared both square honeycomb lattices. This contradictory the observation form lattice. However, perforations can be...
We calculate the spin transport of hydrogenated graphene using Landauer-B\"uttiker formalism with a spin-dependent tight-binding Hamiltonian. Hydrogen adatoms are common defect and they carry finite magnetic moment, which makes it important to understand their influence on for graphene-based devices. Our model accurately reproduces density-functional theory band structure atom-projected density states. The advantages that simultaneously gives information sheet resistance localization length...
The electronic properties of graphene may be changed from semimetallic to semiconducting by introducing perforations (antidots) in a periodic pattern. such antidot lattices (GALs) have previously been studied using atomistic models, which are very time consuming for large structures. We present continuum model that uses the Dirac equation (DE) describe and optical GALs. advantages calculation does not depend on size structures results scalable. In addition, an approximation band gap DE is...
A multipolar split cuff electrode is used for fascicle selective recording of the electroneurogram (ENG) sciatic nerve rabbit. Several configurations were evaluated with regarding to selectivity: peroneal and tibial nerves stimulated alternately ENG was recorded at different sides nerve. The results two are presented.
In order to use graphene for semiconductor applications, such as transistors with high on/off ratios, a band gap must be introduced into this otherwise semimetallic material. A promising method of achieving is by introducing nanoscale perforations (antidots) in periodic pattern, known antidot lattice (GAL). barrier (GAB) can made 1D GAL strip an pristine sheet graphene. paper, we will the Dirac equation (DE) spatially varying mass term calculate electronic transport through structures. Our...
Magnetic fields are often used for characterizing transport in nanoscale materials. Recent magnetotransport experiments have demonstrated that ballistic is possible graphene antidot lattices (GALs). These inspired the present theoretical study of GALs a perpendicular magnetic field. We calculate through barriers (GABs), which finite rows antidots arranged periodically pristine sheet, using tight-binding model and Landauer-B\"uttiker formula. show GABs behave as ideal Dirac mass smaller than...
In the present work an electrode configuration is presented that makes it possible to obtain reduction of artifacts when recording nerve signals monopolarly. Recordings were done in three different ways, tripolar, monopolar, and optimised monopolar. When comparing monopolar with a standard recording, where no artifact takes place, stimulation are reduced 16% muscle artefacts 14% peak-peak amplitude.
The effects of several stimulation patterns at constant duty cycle on isometric and isokinetic knee torque development fatigue-induced decline in electrically stimulated paralyzed human quadriceps were studied. benefit optimizing the interpulse intervals (PISi)n comparison to a repetitive train (constant PIS) increased with number pulses. Application an optimized pattern sustained intermittent resulted higher torque-time integral (TI) per cycle. overall loss had typical exponential decay...
Magnetic fields are often used for characterizing transport in nanoscale materials. Recent magnetotransport experiments have demonstrated that ballistic is possible graphene antidot lattices (GALs). These inspired the present theoretical study of GALs a perpendicular magnetic field. We calculate through barriers (GABs), which finite rows antidots arranged periodically pristine sheet, using tight-binding model and Landauer-B\"uttiker formula. show GABs behave as ideal Dirac mass smaller than...
Inspired by recent experimental realizations of monolayer Fe membranes in graphene perforations, we perform ab initio calculations monolayers and embedded order to assess their structural stability magnetization. We demonstrate that has a larger spin magnetization per atom than bulk exhibit comparable Fe. find free-standing is structurally more stable triangular lattice compared both square honeycomb lattices. This contradictory the observation form lattice. However, perforations can be...