Browsing Moksliniai ir apžvalginiai straipsniai / Research and Review Articles by Research field "N 002 - Fizika / Physics"
Now showing items 1-20 of 626
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137-Cs radionuklido tūrinio aktyvumo pokyčiai Baltijos jūros Lietuvos priekrantėjė 2004 m
(Sveikatos mokslai : visuomenės sveikata, medicina, slauga, 2005)2004 m. vasaros-rudens laikotarpiu atlikti 137Cs radionuklido tūrinio aktyvumo (TA) tyrimai Baltijos jūros priekrantėje ties Juodkrante. Bandiniai imti trimis etapais. Nustatyta minimali ir maksimali TA reikšmės per šį ... -
137Cs and 90Sr behavioural regularities in the southeastern part of the Baltic Sea
(Journal of Environmental Radioactivity, 2001)Variations in 137Cs concentrations were investigated over the period 1986-1997 in the southeastern part of the Baltic Sea, following the Chernobyl power plant accident. The rate of "self-cleaning" was demontsrated to be ... -
137Cs in Lake Tapeliai, Lithuania
(Lithuanian journal of physics, 2012)The results of an integrated study of the radiocesium behaviour in Lake Tapeliai by using not only conventional data on radiocesium activity concentrations in lake water and sediments but also a complex data set on seasonal ... -
137Cs ir 90Sr radionuklidų tūrinio aktyvumo pokyčių Baltijos ir Juodosios jūros vandenyse palyginamoji analizė
(Žmogaus ir gamtos sauga 2022: mokslo straipsnių rinkinys = Human and nature safety 2022: selected papers, 2022)Jūrinės aplinkos taršos įvertinimas ypač svarbus gamtosauginiu aspektu. Ypatingas dėmesys skiriamas uždarų jūrų būklei. Baltijos ir Juodoji jūros yra vienos labiausiai užterštų jūrų įvairios kilmės teršalais, įskaitant ir ... -
80-dB microwave noise from an avalanche transistor circuit
(Elektronika ir elektrotechnika, 2015)Extremely high ‘excess noise ratio’ of 80 dB is observed from an avalanche transistor circuit, operating in a random pulse mode. Broadband noise spectrum measured from 30 MHz to 1 GHz exhibits good flatness with the ... -
A case study on the assessment of chemical and physical pollution levels during the copying process
(Sustainability: Job Design for Human and Organisational Sustainability in the Context of Emerging Technologies, 2022)In accordance with sustainable development goals (SDG’s), urgent action should be taken to make the societal and natural environments better for human beings. People spend most of their time indoors, therefore growing ... -
A method for measuring the specific electrical conductivity of an anisotropically conductive medium
(Acta Physica Polonica A, 2008)The paper deals with the ways of finding an electrical conductivity tensor of a plane and anisotropically conductive sample. Application of the Van der Pauw method to investigate the conductivity of anisotropically conductive ... -
A nonlocal integrable generalization of the Frenkel-Kontorova model of dislocation
(Acta Physica Polonica B, 2006)A new simple nonlocal generalization of the Frenkel--Kontorova model of dislocation in solid body as a type of the nonlocal {sine}-Gordon equation with the generalized interaction term is suggested. Its limit cases, ... -
A novel approach for studying the effects of corona treatment on ink-substrate interaction
(Nordic Pulp and Paper Research Journal, 2015)A novel method combining corona treatment and Bristow’s wheel has been developed to study the effect of corona charging on immediate liquid-substrate interactions. The assembly makes it possible to study the effects of ... -
A numerical algorithm for simulation of the Q-switched fiber laser using the travelling wave model
(Lithuanian mathematical journal, 2008)We develop a finite-difference scheme for approximation of a system of nonlinear PDEs describing the Qswitching process. We construct it by using staggered grids. The transport equations are approximated along characteristics, ... -
A red-emitting thiophene-modified BODIPY probe for fluorescence lifetime-based polarity imaging of lipid droplets in living cells
(Journal of materials chemistry B, 2023)Intracellular polarity in lipid droplets as well as other organelles may provide useful knowledge about various processes taking place in live cells. Therefore, small fluorophores capable of visualising polarity are ... -
A refinement of clinical tumor marker monitoring: Why not use an inverse value of doubling time?
(Medical principles and practice : international journal of the Kuwait University, Health Science Centre, 2021)OBJECTIVES: The aim of this study was to compare prostate-specific antigen (PSA) kinetics - half-life time (HT), doubling time (DT), and elimination rate PSA (ePSA) in prostate cancer (PCa) monitoring. Implementation of ... -
A series of new luminescent non-planar 1,8-naphthyridine derivatives giving coloured and close-to-white electroluminescence spectra
(Journal of luminescence, 2017)We report a synthesis of 37 new 1,8-naphthyridine based compounds having a non-planar bicyclic moiety (bicyclo[3.3.1]nonane, bicyclo[3.3.0]octane and camphor). We measured energetic characteristics (EHOMO=[−5.9; −5.4] eV, ... -
A systematic insight into the surface plasmon polaritons guided by the graphene based heterostructures
(Optical and quantum electronics, 2020)Graphene paves the way for the outstanding applications as it is one-atom thick and possesses perfect tunability properties. The main goal of this work is to study mode patterns of surface waves propagating in the ... -
Aberration-insensitive microscopy using optical field-correlation imaging
(APL Photonics, 2019)The possibility to reduce the effect of optical aberrations has been proposed in several publications on classical ghost imaging. The two-armed ghost-imaging systems make use of spatially incoherent illumination and ... -
Absorption enhancement in hyperbolic metamaterials by means of magnetic plasma
(Applied sciences: Special issue: The newest research in novel materials, 2021)The main features of surface plasmon polaritons (SPPs) that can propagate in a metamaterial–magnetic plasma structure are studied from theoretical perspectives. Both the conventional and imaginary parts of the dispersion ... -
Accelerated ageing effects in nanostructured La0.83Sr0.17MnO3 films
(Thin solid films, 2015)The kinetics of resistivity and magnetoresistance change was studied during ageing of thin nanostructured La0.83Sr0.17MnO3 manganite films grown on lucalox (99.9% Al2O3+0.01% MgO) substrate by PIMOCVD method. It was obtained ... -
Active suppression of piezoelectric ringing in pockels cells for laser cavity application
(Symmetry: Special issue: Optical and electronic characteristics of semiconductor materials and devices, 2021)Pockels cells used as electro-optical modulators in high-power high-repetition lasers suffer from piezoelectric ringing phenomenon due to piezoelectric properties of the crystals. A new method for active suppression of the ... -
Adaptive nonlinear controller for stabilizing saddle-type steady states of dynamical systems
(Nonlinear dynamics, 2015)An adaptive feedback method for stabilizing unknown saddle- type steady states of dynamical systems is described. Many other techniques developed so far use unstable linear filters to track and control the saddles. In ... -
Advanced materials for light emitting diodes: noise characterisation
(Physica status solidi. C, 2009)Comprehensive investigation of optical and electrical characteristics of nitride-based (InGaN) light emitting diodes (LEDs), and comparison of the results with those for phosphide-based (AlInGaP) are presented. The main ...