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Lithuanian Journal of Physics最新文献

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Environmental isotopes and noble gas ages of the deep groundwater with coupled flow modelling in the Baltic artesian basin 波罗的海自流盆地深部地下水环境同位素和稀有气体年龄的耦合流动模拟
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-04-12 DOI: 10.3952/PHYSICS.V61I1.4407
R. Mokrik, V. Samalavičius, M. Gregorauskas, M. Bujanauskas
{"title":"Environmental isotopes and noble gas ages of the deep groundwater with coupled flow modelling in the Baltic artesian basin","authors":"R. Mokrik, V. Samalavičius, M. Gregorauskas, M. Bujanauskas","doi":"10.3952/PHYSICS.V61I1.4407","DOIUrl":"https://doi.org/10.3952/PHYSICS.V61I1.4407","url":null,"abstract":"In this study, modelled groundwater actual flow times in intermediate and deep aquifers, covered by regional scale impermeable aquitards, were compared with 4He and 81Kr age dating results. To improve the reliability of the steady state 3D groundwater flow model, the isotopic ages of deep groundwater were compared to the MODPATH modelled travel times. The highest helium values in groundwater reservoirs coincide with fault zones in the crystalline basement and sedimentary cover near Rapakivi granite massifs. Insights into isotope-geochemical anomalies of the Baltic Artesian Basin intermediate and deep groundwater support their main distribution peculiarities in the flow path towards the Baltic Sea coast lowland and seabed depression as the regional groundwater discharge area.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41838477","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
Phase space holography with no strings attached 无附加条件的相空间全息术
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-02-02 DOI: 10.3952/physics.v61i4.4642
D. Khveshchenko
{"title":"Phase space holography with no strings attached","authors":"D. Khveshchenko","doi":"10.3952/physics.v61i4.4642","DOIUrl":"https://doi.org/10.3952/physics.v61i4.4642","url":null,"abstract":"Keywords: phase space, holographic correspondence, hydrodynamics, effective metric \u0000We discuss the Wigner function representation from the novel standpoint of establishing a natural holographylike correspondence between the descriptions of a generic quantum system in the phase space (‘bulk’) picture versus its spacetime (‘boundary’) counterpart. In certain cases, the former may reduce to the gravity-like dynamics of a local metric-type variable while the latter takes on the form of some bosonized collective field hydrodynamics. This generic pseudo-holographic duality neither relies on any particular symmetry of the system in question, nor does it require any relation to some underlying ‘string theory’, thus providing a systematic way of constructing practical – as opposed to the previous ‘ad hoc’ – examples of genuine holographic duality.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47913342","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: 3
Mechanism of Proton Transfer in Bacteriorhodopsin 细菌视紫红质的质子转移机制
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-18 DOI: 10.21203/rs.3.rs-142975/v1
M. Mačernis, L. Mourokh, L. Valkunas
{"title":"Mechanism of Proton Transfer in Bacteriorhodopsin","authors":"M. Mačernis, L. Mourokh, L. Valkunas","doi":"10.21203/rs.3.rs-142975/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-142975/v1","url":null,"abstract":"Photoinduced proton pumping in bateriorhodopsin (bR) was extensively studied using multiple experimental methods and utilizing various theoretical modeling approaches. These studies usually refer to well-resolved structural data of bacteriorhodopsin. However, despite obtained results, the origin of the proton pumping force initiated by the electronic excitation of retinal remains questionable. Here we discuss the challenges and approaches to modeling the proton transfer in bR and demonstrate that the process, which starts from the electronic excitation of the retinal molecule, is mainly due to the detailed arrangement of the protein environment. Using quantum chemical calculations, we have revealed that the retinal molecule after its excitation is fixed in the ground state of 13-cis,15-syn configuration, as a result of interaction with specific protein residuals. Thus, reaching this fixed configuration, the proton is first transferred to the Asp-85 residue from the water molecule, which is subsequently restored by the proton initially located in the Schiff base.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47350514","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
Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation 光阳离子掺杂和弹性单轴变形引起的晶格对称性降低的NaCl基体辐射缺陷
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4514
K. Shunkeyev, Z. Ubaev, A. Lushchik, L. Myasnikova
{"title":"Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation","authors":"K. Shunkeyev, Z. Ubaev, A. Lushchik, L. Myasnikova","doi":"10.3952/physics.v61i3.4514","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4514","url":null,"abstract":"The processes of radiation defect creation and radiative relaxation of electronic excitations under applied local or/and uniaxial elastic deformation have been studied in NaCl crystals by means of optical absorption, luminescence and thermoactivation spectroscopy methods. In NaCl:Li at 80 K, X-ray-induced absorption bands peaked around 3.35 and 4.6 eV have been detected and ascribed to interstitial halide atoms located nearby Li impurity cations, HA(Li) centres. Subsequent thermal annealing of HA(Li) centres leads to the formation of polyhalide centres responsible for the absorption band at 5.35 eV. In an X-irradiated and stressed NaCl:Li crystal (degree of uniaxial elastic deformation of ε = 0.9%), the peak of thermally stimulated luminescence at ~115 K is composed of the ~2.7-eV emission appearing, in our opinion, due to the recombination of the electron, thermally released from an F′ centre, with a hole-type HA(Li) centre. The applied uniaxial elastic stress facilitates the self-trapping of anion excitons in regular regions of a NaCl lattice and impedes the energy transfer by mobile excitons to impurities/defects and, in turn, attenuates the Br-related luminescence peaked at 3.95 eV with respect to the π-emission of self-trapped excitons (~3.35 eV). The 3.95 eV emission has been detected in a natural NaCl crystal containing homologous Br impurity ions.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032346","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
Deposition of colloidal metal nanoparticles on zinc oxide nanorods and their influence on visible photoluminescence 胶体金属纳米颗粒在氧化锌纳米棒上的沉积及其对可见光致发光的影响
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4515
D. Kulmatova, M. Baitimirova, U. Malinovskis, C. Chang, Y. Gu, A. Tamulevičienė, D. Erts, J. Prikulis
{"title":"Deposition of colloidal metal nanoparticles on zinc oxide nanorods and their influence on visible photoluminescence","authors":"D. Kulmatova, M. Baitimirova, U. Malinovskis, C. Chang, Y. Gu, A. Tamulevičienė, D. Erts, J. Prikulis","doi":"10.3952/physics.v61i3.4515","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4515","url":null,"abstract":"We examine the influence of colloidal Au and Ag nanoparticles (NP) on hydrothermally grown ZnO nanorods (NR). Individual 60 nm diameter NP and small NP assemblies without formation of large aggregates were deposited on poly-L-lysine covered NR films using the dip-coating method. The evaluation of morphological and optical properties of the obtained ZnO-metal hybrids was done using scanning electron microscopy, photoluminescence (PL) and diffuse reflection spectroscopy. The presence of Au NP selectively suppressed the PL components near 560 nm wavelength associated with ZnO surface defects, whereas equally sized Ag NP resulted in a much smaller change of PL signal, barely above the noise level. The presented results may be useful for tuning the optical properties of hybrid materials in development of sensor or photovoltaic devices.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032411","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
Modelling of the pedestal growth of silicon crystals 硅晶体基座生长的建模
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4517
K. Surovovs, A. Kravtsov, J. Virbulis
{"title":"Modelling of the pedestal growth of silicon crystals","authors":"K. Surovovs, A. Kravtsov, J. Virbulis","doi":"10.3952/physics.v61i3.4517","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4517","url":null,"abstract":"The pedestal method is an alternative to the well-known floating zone method, both of which are performed with high-frequency electromagnetic heating. Unlike the floating zone method, in the pedestal method a single crystal is pulled upwards from the melt. It allows one to lower feed rod quality requirements and simplify the process control due to the absence of open melting front. As the pedestal method has not been widely used in industry for silicon crystals, its development requires extensive numerical modelling. The present work describes application of the previously created mathematical model for crystals with diameters higher than it is currently possible in the experimental setup, as well as for the cone growth phase. Supplementary free surface heating, that prevents melt centre freezing during the seeding phase, has been added at the beginning of cone phase. After multiple sets of simulations, an optimal scheme of heating control for cone growth was proposed.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032463","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
Reduction of impurity sources in Si crystal growth system with electron gun beam heating 电子束加热硅晶体生长体系中杂质源的减少
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4518
A. Kravtsov, J. Virbulis, A. Krauze
{"title":"Reduction of impurity sources in Si crystal growth system with electron gun beam heating","authors":"A. Kravtsov, J. Virbulis, A. Krauze","doi":"10.3952/physics.v61i3.4518","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4518","url":null,"abstract":"A new series of experiments was conducted to determine the source of impurities in the process of silicon crystal growth with electron beam heating. A gas-dynamic window was placed between the electron gun and growth chamber. Also positively-charged traps were placed along the crucible to reduce the number of electrons hitting the chamber and the crucible. Five experiments were conducted: two with the window, two with charge traps, and one with both the window and charge traps. The analysis of obtained samples showed that the gas-dynamic window decreases the content of Al, Cu, Fe, Cr and O2, and the trap, used in the experiments, decreases the content of Fe, Cr and Cu in residues of the melt. The content of all impurities, except Al, is close to the goal level. Al impurities come only from the gun, but the gas-dynamic window cannot eliminate them completely. It seems that Al impurities come either as neutral atoms carried by the gas or as positively charged ions. To reduce these impurities, a separation of the Al flow from the beam by the magnetic field is proposed.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032559","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: 1
Effect of spring grass fires on indoor air quality in air-conditioned office building 春季草地火灾对空调办公楼室内空气质量的影响
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4519
J. Pauraitė, I. Garbarienė, A. Minderytė, V. Dudoitis, G. Mainelis, L. Davulienė, I. Uogintė, K. Plauškaitė, S. Byčenkienė
{"title":"Effect of spring grass fires on indoor air quality in air-conditioned office building","authors":"J. Pauraitė, I. Garbarienė, A. Minderytė, V. Dudoitis, G. Mainelis, L. Davulienė, I. Uogintė, K. Plauškaitė, S. Byčenkienė","doi":"10.3952/physics.v61i3.4519","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4519","url":null,"abstract":"Open biomass burning (OBB) is a significant air pollution source, but it is still not clear to what extent OBB events affect indoor air quality [1]. Outdoor and indoor measurements of submicron particulate matter (PM1) were conducted on 25–29 April (2019) in the capital city Vilnius (Lithuania). Fires from neighbouring countries (Belarus, Ukraine and Russia) and in the vicinity of Vilnius broke out during the measurement campaign. The temporal evolution and transport of OBB plume were investigated by combining the air mass backward trajectory analysis and fire satellite observation (MODIS) database. Measurements of the PM1 chemical composition in real-time were performed using an aerosol chemical speciation monitor (ACSM) and an aethalometer. Organic matter was the clearly dominant component, accounting for >70%, in both indoor and outdoor PM1. The air filtering system of the office building removed approximately up to 55% of PM1. Despite a significantly lower PM1 pollution level in the office, highly acidic indoor PM1 could have harmful effects on the human health. Source apportionment of particulate carbonaceous matter revealed a significant importance of OBB-related particles (average 56%) to indoor air.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032642","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: 1
In search of an artificial morphotropic phase boundary: Lead free barium titanate based composites 寻找人工形态变化相边界：无铅钛酸钡基复合材料
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.v60i4.4358
S. Balčiu̅nas, M. Ivanov, J. Banys, S. Ueno, S. Wada
{"title":"In search of an artificial morphotropic phase boundary: Lead free barium titanate based composites","authors":"S. Balčiu̅nas, M. Ivanov, J. Banys, S. Ueno, S. Wada","doi":"10.3952/physics.v60i4.4358","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4358","url":null,"abstract":"Broadband dielectric spectroscopy was used to study potassium niobate (KN) and barium titanate (BT) core– shell-like composites. KN shell was obtained using a solvothermal reaction method. High frequency results show a huge anomaly that is associated with electro-mechanical coupling. We tried to extract spontaneous polarization values using a theoretical model. We also observed little or no evidence of KN-related phase transitions in the dielectric spectra, although infrared measurements showed typical KN spectral features. Furthermore, we show that a small change in the sintering process allows tuning of dielectric permittivity by an order of magnitude.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43455841","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
Long-time drift induced changes in electrical characteristics of graphene–metal contacts 石墨烯-金属接触电特性的长时间漂移变化
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.v60i4.4359
A. Sakavičius, V. Agafonov, V. Bukauskas, T. Daugalas, M. Kamarauskas, A. Lukša, V. Nargelienė, G. Niaura, M. Treideris, A. Šetkus
{"title":"Long-time drift induced changes in electrical characteristics of graphene–metal contacts","authors":"A. Sakavičius, V. Agafonov, V. Bukauskas, T. Daugalas, M. Kamarauskas, A. Lukša, V. Nargelienė, G. Niaura, M. Treideris, A. Šetkus","doi":"10.3952/physics.v60i4.4359","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4359","url":null,"abstract":"Chemical vapour deposition (CVD) graphene is commonly recognized as promising 2D material for development of electronic devices. However, the long-term drift of electrical parameters still requires deeper understanding before the technological means can be selected for an individual type of the devices. In this work, the changes in the electrical resistance were investigated over long time in the planar samples based on the CVD graphene with Au and Ni contacts. The samples were arranged as arrays of the resistors on a silicon substrate covered with a 250 nm layer of thermally grown silicon dioxide. The annealing in pure argon gas flow at 573 K was used to return the electrical properties of samples to the initial state. The effects of drift and annealing were compared for the three parts of structures, namely the electrical contact, the graphene sheet and the edge of the metal film with a hanging graphene sheet. For these parts, the resistance changes were related to the strain and doping of supported and hanged parts of the graphene sheet. Raman spectroscopy and Kelvin force probe microscopy were used to characterize charge doping, strain and work function in the graphene. The drift was explained in terms of the most prominent changes in the doping, strain and work function detected within the edge zone of the contact. It was proved that the annealing significantly changed the p-type doping and work function in the graphene layer in this edge zone. The properties were almost independent of test conditions in the SiO2 supported graphene. The changes in the contact parameters produced by drift mechanisms were proved being reversible under proper annealing conditions.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46463513","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
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