A5023028744- Characterization and Applications of Magnetic Nanoparticles
- Micro and Nano Robotics
- Geomagnetism and Paleomagnetism Studies
- Magnetic and Electromagnetic Effects
- Optical Imaging and Spectroscopy Techniques
- Infrared Thermography in Medicine
- Advanced NMR Techniques and Applications
- Geophysical and Geoelectrical Methods
- Minerals Flotation and Separation Techniques
- Thermoregulation and physiological responses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Thermodynamics and Statistical Mechanics
- Theoretical and Computational Physics
- Geophysics and Gravity Measurements
- Magnetic Properties and Applications
- Parallel Computing and Optimization Techniques
- Iron oxide chemistry and applications
- Advanced Chemical Physics Studies
- Diamond and Carbon-based Materials Research
- 3D Printing in Biomedical Research
- Quantum, superfluid, helium dynamics
- Spectroscopy and Quantum Chemical Studies
- Atomic and Subatomic Physics Research
- Photoacoustic and Ultrasonic Imaging
- Non-Invasive Vital Sign Monitoring
University of Latvia
2013-2023
The protocol of microrheological measurements consists recording the dynamics orientation rod when magnetic field is applied at an angle to and observing its relaxation after switched off.
The present study introduces a recently developed compact hybrid device for real-time monitoring of skin oxygen saturation and temperature distribution. prototype involves snapshot hyperspectral camera, multi-wavelength illuminator, thermal built-in computer with custom-developed software. To validate this in-vivo we performed upper arm vascular occlusion on eight healthy volunteers. Palm maps were analyzed in using k-means segmentation algorithm two-layer optical diffuse model. system...
A bifurcation diagram for anisotropic magnetic particles in a precessing field is analyzed. It found that synchronous regime the case of prolate particle exists all precession angles if frequency rotation below some critical value. An oblate has limited range angle. To understand flow suspensions these fields, it essential to take into account differing dynamics and particles.
A model of a single ferromagnetic particle with finite coupling energy the magnetic moment body is formulated, and regimes its motion in rotating field are investigated. Regimes possible that synchronous asynchronous field. In regime easy axis plane at low frequencies (a planar regime) on cone high precession regime). The stability these investigated, it shown stable for strengths below critical value. particular range strength value, irreversible jumps take place regime. this above which...
Skin capillary blood oxygen saturation is a clinically important diagnostic parameter, which provides valuable information for timely treatment of pathological conditions e.g. sepsis, hypoxemia or decompression illness. Hyperspectral imaging non-invasive optical techniques with high clinical potential, however its use skin detection still challenging, therefore in the present study, method in-vivo manipulation was developed, and reliability evaluated by means hyperspectral saturation. In...
The present study introduces recently developed compact hyperspectral snapshot system (device and software) for skin oxygen saturation monitoring. This prototype device involves camera, multi-wavelength illuminator, optical filter crossed polarizers. was validated using reference color samples and<i> in-vivo</i> during finger arterial occlusion tests. demonstrated good performance of measurements in spectral range 500-630nm. results confirmed reliability <i>in-vivo </i>assessment blood saturation.
Stability analysis of paramagnetic prolate and oblate spheroidal particle in precessing magnetic field is studied. Bifurcation diagram calculated analytically dependence frequency precession angle. The direction synchronous regime calculated. Rotational dynamics mean rotational asynchronous found. Obtained theoretical model gives possibility to calculate the limiting case (when motion periodic). Theoretically obtained models were compared with experimental results rod like field....
Distribution of magnetic field around different objects is important for various applications materials. Field distribution can be measured with a 3-axis Hall probe sensor, which moved the sample. There are excellent systems available in market this purpose example, mapper MMS-1A-RS from SENIS AG. However, these quite expensive, starting 25 000 ϵ. Here we demonstrate how simple automated made common parts found laboratories, test it to verify accuracy, compare results numerical simulations...
Creating a physiologically relevant shear stress in organ-on-a-chip (OOC) devices requires careful tailoring of microfluidic flow parameters. It is currently fairly common to use simple approximation assuming constant viscosity, even for serum-based media. Here, we show that popular nutrient solution (Dulbecco's Modified Eagle Medium supplemented with Fetal Bovine Serum) more complex treatment (i.e., non-Newtonian fluid), observed values significantly greater than reported literature. We...
We present an implementation of the adaptively compressed exchange (ACE) operator in linearized-augmented plane waves formalism. ACE is a low-rank representation Fock that avoids any loss precision for total energy. Our study shows this property remains all-electron case, as we apply method nonrelativistic total-energy calculations with hybrid exchange-correlation functional PBE0. The obtained data light atoms and molecules are within few $\ensuremath{\mu}\mathrm{Ha}$ precise...
In this work we show that macroscopic experiments can be used to investigate microscopic systems. Such enable testing the assumptions and results obtained by theoretical considerations or simulations not under microscope (e.g., orientation of a spherical particle). To emulate dynamics single hematite cube immersed in water subjected rotating magnetic field, cubic magnet is firmly positioned 3D printed superball shell. The dimensionless parameters systems equalized using glycerol-water...
We present an implementation of the adaptively compressed exchange (ACE) operator in LAPW formalism. ACE is a low-rank representation Fock that avoids any loss precision for total energy. Our study shows this property remains all-electron case, as we apply method non-relativistic total-energy calculations with hybrid exchange-correlation functional PBE0. The obtained data light atoms and molecules are within few $\mu$Ha off precise multi-resolution-analysis calculations. Aside from ACE,...