5 research outputs found
Optical properties of dense metal nanoparticle arrays and their application for sensing devices
DarbÄ tiek pÄtÄ«tas tuvu sakÄrtotu metÄla nanodaļiÅu masÄ«vu, iegÅ«tu ar anodizeta oksÄ«da maskas palÄ«dzÄ«bu, Ä«paŔības. Sudraba un zelta nanodaļiÅas ar diametru 20-30 nm robežÄs un centru attÄlumu 50 nm izrÄda spÄcÄ«gu gaismas izkliedi redzamajÄ un tuvajÄ infrasarkanajÄ reÄ£ionÄ lokalizÄtÄs plazmonu rezonanses dÄļ.
Pateicoties masÄ«vu tuvajai sakÄrtotÄ«bai var novÄrot haotisku granulu struktÅ«ras interferences ainu izkliedÄtajÄ gaismÄ, kura ir atkarÄ«ga no polarizÄcijas un citiem eksperimentÄliem parametriem.
Darba galvenais uzdevums ir pÄtÄ«t Å”o masÄ«vu optiskÄs Ä«paŔības un to pielietojumu sensoru izgatavoÅ”anai. SvarÄ«gÄkais rezultÄts ir novÄrotÄ polarizÄcijas maiÅa izkliedÄtajai gaismai daļiÅu mijiedarbÄ«bas dÄļ, kÄ arÄ« demonstrÄts lauÅ”anas koeficienta noteikÅ”anas sensors, kurÅ” balstÄs uz izkliedÄtÄs gaismas depolarizÄcijuThis work addresses properties of dense metal nanoparticle arrays obtained using anodized aluminum oxide masks. Silver and gold nanoparticles with diameters in 20-30 nm range and center separation approximately 50 nm show strong light scattering in visible and near infrared spectral range due to localized surface plasmon resonance.
Short-range ordered arrangement of arrays cause chaotic interference grain structure which can be observed in scattered image and is sensitive to light polarization and other experimental parameters.
The main task of this work is to study optical properties of arrays and test their usage in sensor applications. The key observation is change of polarization in scattered field due to interparticle coupling. A prototype of refractive index sensor, which relies on changes in scattered depolarized field is demonstrated
Effects of different strength training regimes on maximum strength and strength endurance.
VeselÄ«bas sporta speciÄlistsIzglÄ«tÄ«ba, pedagoÄ£ija un sportsHealth care sports specialistEducation, Pedagogy and SportsDarba tÄma: DažÄdu spÄka treniÅu režīmu ietekme uz maksimÄlo spÄku un spÄka izturÄ«bu.
Å ajÄ pÄtÄ«jumÄ piedalÄ«jÄs 14 dalÄ«bnieki, vÄ«rieÅ”i vecumÄ no 18 ā 45 gadiem, bez praktiskÄm veselÄ«bas problÄmÄm, traumÄm, kas varÄtu apdraudÄt veselÄ«bu, pusgada laikÄ regulÄri nav nodarbojuÅ”ies ar fiziskÄm aktivitÄtÄm, kas saistÄ«tas ar lielu pretestÄ«bas pÄrvarÄÅ”anu (smagi treniÅi ar svariem), brÄ«vprÄtÄ«gi izteikuÅ”i vÄlmi piedalÄ«ties pÄtÄ«jumÄ.
DalÄ«bnieki, pÄc uzrÄdÄ«tÄ spÄka rÄdÄ«tÄjiem tika sadalÄ«ti divÄs grupÄs, un katra grupa (A un B), veica seÅ”u treniÅu ciklu kÄdÄ no treniÅu režīmiem (Grupa A ar atteici, grupa B bez atteices), un pÄc seÅ”u treniÅu cikla atkÄrtoti tika testÄts katrs dalÄ«bnieks. PÄc testiem abas grupas mainÄ«jÄs vietÄm treniÅu režīmiem, un veica vÄl seÅ”us treniÅus. Abas grupas atkÄrtoti tika testÄtas. Grupas trenÄjÄs pÄc vienas treniÅu programmas seÅ”as nedÄļas.
Å Äds pÄtÄ«jums deva iespÄju noskaidrot, kurÅ” treniÅu režīms efektÄ«vÄk paaugstina maksimÄlo spÄku un spÄka izturÄ«bu stieÅa spieÅ”anÄ guļus, stieÅa vilkÅ”anÄ pie krÅ«tÄ«m lietojot augstu bloku un slÄ«pi uz augÅ”u pavÄrstu kÄju spieÅ”anÄ.
Darba mÄrÄ·is: IzpÄtÄ«t dažÄdu spÄka treniÅu režīmu ietekmi uz spÄku un spÄka izturÄ«bu
IzvirzÄ«tÄ hipotÄze: TreniÅu režīms lÄ«dz atteicei efektÄ«vÄk paaugstina maksimÄlo spÄku un spÄka izturÄ«bu.
Tika noskaidrots, ka maksimÄlais spÄks vairÄk paaugstinÄjÄs trenÄjoties ar atteici. KÄ arÄ« treniÅu režīms bez atteices vairÄk paaugstina spÄka izturÄ«bu. SpÄka izturÄ«bu kÄju spieÅ”anÄ vienlÄ«dz efektÄ«vi paaugstina gan treniÅi ar atteici, gan bez.Theme: Effects of different strength training regimes on maximum strength and strength endurance. 14 men aged 18-45, with no health issues, no injuries that could possibly put participant at risk, didnāt take part in any regular physical activity related to resistance training (heavy weight training), voluntarily participated in this study.
After evaluation of strength parameters participants were divided in two groups, and each group (A and B) performed training cycle consisting of six training sessions in specific training regime. Group A performed training to failure while group B performed same training schedule to non-failure. After first training cycle participants were evaluated to assess strength increment. Following second training cycle were performed by both groups and training regimes were switched. After second training cycle participants were evaluated again. Both groups executed the same training program in period of six weeks.
This study provided an opportunity to determine which strength training regime is more effective at increasing maximum strength and strength endurance on bench press, lat pulldown and seated leg press.
Objective: Investigate the effect of different strength training regimes on maximum strength and strength endurance.
Hypothesis: Training to failure increases maximum strength and strength endurance more effectively.
The results of this study determined that training to failure increased maximum strength more effectively. Training to non-failure was more superior that training to failure at increasing strength endurance. Strength endurance on seated leg press was equally influenced by both training to failure and non-failure.
Key words: training regime, strength, strength endurance, failure, maximum strengt
Optical properties of thin metal films with nanohole arrays on porous aluminaāaluminum structures
Enhanced plasmonic attenuation of reflection is observed in a goldāaluminaāaluminum multilayer system near the interferometric anti-reflection condition.</p