Lithuanian Journal of Physics最新文献_第9页

LiSAF: an efficient and durable nonlinear material for supercontinuum generation in the ultraviolet LiSAF:一种高效耐用的非线性材料，用于在紫外线下产生超连续统

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4357

A. Šuminienė, V. Jukna, R. Šuminas, G. Tamosauskas, M. Vengris, A. Dubietis

引用次数: 2

Broadband and infrared spectroscopy of Ag0.98Li0.02NbO3 ceramics Ag0.98Li0.02NbO3陶瓷的宽带和红外光谱

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4360

E. Palaimiene, J. Macutkevič, J. Banys, I. Gruszka, A. Kania

引用次数: 2

Negative flow of energy in a mechanical wave 机械波中的负能量流

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-10-29 DOI: 10.3952/physics.v60i4.4356

A. Matulis, A. Acus

引用次数: 0

One SYK single electron transistor 一个SYK单电子晶体管

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4305

D. Khveshchenko

引用次数: 9

Efros–Shklovskii hopping in the electronic transport in 2D p-GaAs 二维p-GaAs中电子输运中的Efros-Shklovskii跳变

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4303

S. Dlimi, L. Limouny, J. Hemine, A. Echchelh, A. E. Kaaouachi

引用次数: 7

Optimization of wide-field second-harmonic generation microscopy for fast imaging of large sample areas in biological tissues 用于生物组织大样本区域快速成像的宽视场二次谐波生成显微镜优化

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4301

A. Dementjev, R. Rudys, R. Karpicz, D. Rutkauskas

引用次数: 2

Photoluminescence properties of hybrid perovskites in solar cells with TiO2 and Mg0.2Zn0.8O electron transport layers 具有TiO2和Mg0.2Zn0.8O电子传输层的太阳能电池中杂化钙钛矿的光致发光特性

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4304

A. Cerskus, S. Ašmontas, K. Petrauskas, A. Sužiedėlis, J. Gradauskas, A. Opanasyuk, B. Vengalis

引用次数: 0

The formation of self-assembled structures of C60 in solution and in the volume of an evaporating drop of a colloidal solution 在溶液中和在胶体溶液的蒸发滴的体积中形成C60的自组装结构

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4306

U. Makhmanov, A. Kokhkharov, S. Bakhramov, D. Erts

{"title":"The formation of self-assembled structures of C60 in solution and in the volume of an evaporating drop of a colloidal solution","authors":"U. Makhmanov, A. Kokhkharov, S. Bakhramov, D. Erts","doi":"10.3952/physics.v60i3.4306","DOIUrl":"https://doi.org/10.3952/physics.v60i3.4306","url":null,"abstract":"The results of experiments on the self-aggregation of C60 fullerene molecules both inside a two-component solvent (xylene/tetrahydrofuran) and in the volume of an evaporating drop of C60 colloidal solution on a flat substrate surface are presented. The investigations of C60 solutions using dynamic light scattering, transmission electron microscopy and UV–Vis absorption spectroscopy methods revealed the possibility of synthesis of fractal nanoaggregates with a diameter of up to ~135 nm at low concentrations of C60 in the solutions. The final geometric dimensions of C60 nanoaggregates were determined by the initial concentration of fullerene in the solvent medium. Using the scanning electron microscopy method, we have shown that in an open dissipative system – in the volume of an evaporating droplet of the colloidal solution of fullerene C60 sessile on the surface of a flat glass substrate, large quasispherical nanoaggregates with an average diameter of ~380–800 nm are formed. The physical features and regularities that characterize the processes of self-aggregation of fullerene particles in the volume of a drying drop were determined.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44215715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

A physical mechanism of sensitivity enhancement of organic X-ray detectors with tungsten nanoparticles 纳米钨增强有机X射线探测器灵敏度的物理机制

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-04-28 DOI: 10.3952/physics.v60i2.4225

A. Poškus, Rokas Dobužinskas, M. Viliunas, K. Arlauskas

{"title":"A physical mechanism of sensitivity enhancement of organic X-ray detectors with tungsten nanoparticles","authors":"A. Poškus, Rokas Dobužinskas, M. Viliunas, K. Arlauskas","doi":"10.3952/physics.v60i2.4225","DOIUrl":"https://doi.org/10.3952/physics.v60i2.4225","url":null,"abstract":"A simple theoretical model explaining the increase of X-ray sensitivity caused by adding tungsten nanoparticles into thin layers of organic materials is proposed. The mentioned increase of sensitivity is caused by quenched electron multiplication due to secondary electron emission from tungsten particles. After some simplifying assumptions, an expression of the electron multiplication factor K is derived for the case when tungsten atoms are uniformly mixed with the matrix material. The main assumption of the model is the existence of a threshold energy Emin of the order of 0.1 eV, below which the recombination of charge carriers prevents them from being accelerated by the electric field to energies sufficient for impact ionization. It is shown that this assumption makes the increase of K and photocurrent with increasing electric field much slower than the exponential increase commonly associated with an electron avalanche, and K may even start to decrease when the electric field strength exceeds a certain value. Another factor, which has an adverse effect on the X-ray sensitivity, is the ionization energy loss of photoelectrons inside metallic nanoparticles. The results of Monte Carlo simulations show that in the case of spherical tungsten particles with 0.8 μm diameter, the latter phenomenon may cause an additional decrease of the sensitivity by as much as 75%. In order to reduce this effect, the size of nanoparticles should be reduced, or, alternatively, most of the photoelectrons should be generated in the organic matrix rather than inside the nanoparticles.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46725483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

27Al MAS NMR spectroscopy study of Eu2+-doped and Dy3+-co-doped SrAl4O7 Eu2+掺杂和Dy3+共掺杂SrAl4O7的27Al MAS NMR研究

IF 0.6 4区物理与天体物理

Lithuanian Journal of Physics Pub Date : 2020-04-28 DOI: 10.3952/physics.v60i2.4224

M. Misevicius, L. Dagys, A. Marsalka, Kristina Kristinaityte, V. Balevičius

{"title":"27Al MAS NMR spectroscopy study of Eu2+-doped and Dy3+-co-doped SrAl4O7","authors":"M. Misevicius, L. Dagys, A. Marsalka, Kristina Kristinaityte, V. Balevičius","doi":"10.3952/physics.v60i2.4224","DOIUrl":"https://doi.org/10.3952/physics.v60i2.4224","url":null,"abstract":"The Eu2+-doped strontium aluminate SrAl4O7 samples have shown the blue-green persistent luminescence at 490 nm while the co-doping with Dy3+ shifts the maximum of emission to 475 nm. Undoped, 3% Eu-doped and 6% Dy-co-doped SrAl4O7 samples were prepared by the solid state-reaction method and studied by the solid-state 27Al MAS NMR applying the single pulse-acquire and Hahn-echo pulse sequences. It was shown that the Eu2+ with Dy3+ ion doping did not affect the bulk structure as well as the local Al environment in SrAl4O7. This means that large shifts of the emission maximum cannot be caused by changes in the local environment upon the co-doping of SrAl4O7:Eu2+ with Dy3+. However, the spectral features observed in the range between the signals of 4- and 6-coordinated Al (20–40 ppm) indicate that certain phase imperfections are present in all studied samples, and most probably amorphous/glassy domains were formed. Note that such amount of phase impurities was not detected by standard XRD or FTIR methods. This has revealed the 27Al MAS NMR technique to be a very effective tool monitoring the phase perfectness in series of strontium aluminate samples.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44499735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2