48 research outputs found
Thermal Raman study of Li4Ti5O12 and discussion about the number of its characteristic bands
Lithium battery industry is booming, and this fast growth should be supported
by developing industry friendly tools to control the quality of positive and
negative electrode materials. Raman spectroscopy was shown to be a cost
effective and sensitive instrument to study defects and heterogeneities in
lithium titanate, popular negative electrode material for high power
applications, but there are still some points to be clarified. This work
presents a detailed thermal Raman study for lithium titanate and discusses the
difference of the number of predicted and experimentally observed Raman-active
bands. The low temperature study and the analysis of thermal shifts of bands
positions during heating let us to conclude about advantages of the proposed
approach with surplus bands and recommend using shifts of major band to
estimate the sample heating
Geological structure of the northern part of the Kara Shelf near the Severnaya Zemlya archipelago according to recent studies
Until recently, the North of the Kara Shelf was completely unexplored by seismic methods. Seismic and seismo-acoustic data that have appeared in recent years have made it possible to decipher features of the regional geological structure. This study solves the urgent problem of determining the prospects for the oil and gas potential of the North Kara sedimentary basin. The relevance of the research is associated with determining the prospects of the oil and gas potential of the North Kara sedimentary basin. The aim of the study is to clarify the age of the reflecting horizons using data on the geology of the island, as well as to determine the tectonic position of the sedimentary cover and basement structures in the north of the Kara shelf. The sedimentary cover is divided into three structural levels: Cambrian-Devonian, Middle Carboniferous-Cretaceous, Miocene-Quarter. The Cambrian-Devonian complex fills the deep troughs of the North Kara shelf. The most noticeable discontinuity is the base of Carboniferous-Permian rocks, lying on the eroded surface of folded Silurian-Devonian seismic complexes. The blanket-like plate part of the cover is composed of thin Carbon-Quarter complexes. The authors came to the conclusion that the fold structures of the Taimyr-Severozemelskiy fold belt gradually degenerate towards the Kara sedimentary basin and towards the continental slope of the Eurasian basin of the Arctic Ocean. A chain of narrow uplifts within the seabed relief, which correspond to narrow anticlines is traced to the West of the Severnaya Zemlya islands. Paleozoic rocks have subhorizontal bedding further to the West, within the Kara shelf. Mesozoic folding in the North of the Kara Sea is expressed exclusively in a weak activation of movements along faults. At the neotectonic stage, the shelf near Severnaya Zemlya was raised and the Mesozoic complexes were eroded. The modern seismic activity of the North Zemlya shelf is associated with the ongoing formation of the continental margin
Soliton Squeezing in a Mach-Zehnder Fiber Interferometer
A new scheme for generating amplitude squeezed light by means of soliton
self-phase modulation is experimentally demonstrated. By injecting 180-fs
pulses into an equivalent Mach-Zehnder fiber interferometer, a maximum noise
reduction of dB is obtained ( dB when corrected for
losses). The dependence of noise reduction on the interferometer splitting
ratio and fiber length is studied in detail.Comment: 5 pages, 4 figure
Model of vocational school, high school and manufacture integration in the regional system of professional education
The article is aimed at the model development of vocational, high school and manufacture integration in the regional system of vocational education. The basic approach to the structural-functional model development of vocational, high school and manufacture integration in the regional system of vocational education is an integrative one, taking into consideration the integrated system ?vocational school-high school-manufacture? components in their unity and cooperation, giving it the integrity and structural and functional stability. Structural-functional model of vocational, high school and manufacture integration in
the regional system of vocational education includes functional-target, organizational-structural, content, process and result components
Ocean-bottom seismographs based on broadband MET sensors: architecture and deployment case study in the Arctic
The Arctic seas are now of particular interest due to their prospects in terms of hydrocarbon extraction, development of marine transport routes, etc. Thus, various geohazards, including those related to seismicity, require detailed studies, especially by instrumental methods. This paper is devoted to the ocean-bottom seismographs (OBS) based on broadband molecularβelectronic transfer (MET) sensors and a deployment case study in the Laptev Sea. The purpose of the study is to introduce the architecture of several modifications of OBS and to demonstrate their applicability in solving different tasks in the framework of seismic hazard assessment for the Arctic seas. To do this, we used the first results of several pilot deployments of the OBS developed by Shirshov Institute of Oceanology of the Russian Academy of Sciences (IO RAS) and IP Ilyinskiy A.D. in the Laptev Sea that took place in 2018β2020. We highlighted various seismological applications of OBS based on broadband MET sensors CME-4311 (60 s) and CME-4111 (120 s), including the analysis of ambient seismic noise, registering the signals of large remote earthquakes and weak local microearthquakes, and the instrumental approach of the site response assessment. The main characteristics of the broadband MET sensors and OBS architectures turned out to be suitable for obtaining high-quality OBS records under the Arctic conditions to solve seismological problems. In addition, the obtained case study results showed the prospects in a broader context, such as the possible influence of the seismotectonic factor on the bottom-up thawing of subsea permafrost and massive methane release, probably from decaying hydrates and deep geological sources. The described OBS will be actively used in further Arctic expeditions
Π₯ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΡΠΎΠ·Π½Π°Π½ΠΈΡ: ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΈ ΠΠ±ΡΠ΅ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ ΠΎΠ±ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΈ Β«Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΡ Π°Π½Π΅ΡΡΠ΅Π·ΠΈΠΎΠ»ΠΎΠ³ΠΎΠ² ΠΈ ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΎΠ²Β»
Π₯ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΡΠΎΠ·Π½Π°Π½ΠΈΡ (Π₯ΠΠ‘) ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡ ΡΠΎΠ±ΠΎΠΉ ΡΠΈΠ½Π΄ΡΠΎΠΌΡ ΡΡΠΆΠ΅Π»ΠΎΠ³ΠΎ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΡ ΡΠ΅Π½ΡΡΠ°Π»ΡΠ½ΠΎΠΉ Π½Π΅ΡΠ²Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ, ΠΏΡΠΈΠ²ΠΎΠ΄ΡΡΠΈΠ΅ ΠΊΒ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ Π³ΡΡΠ±ΠΎΠΉ ΠΈΠ½Π²Π°Π»ΠΈΠ΄ΠΈΠ·Π°ΡΠΈΠΈ ΠΈΒ ΡΡΠ΅Π±ΡΡΡΠΈΠ΅ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΡΡΠΈΠ»ΠΈΠΉ ΠΏΠΎΒ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΈΒ ΡΠ΅Π°Π±ΠΈΠ»ΠΈΡΠ°ΡΠΈΠΈ, ΠΊΠΎΡΠΎΡΡΠ΅ Π»ΠΎΠΆΠ°ΡΡΡ Π½Π°Β ΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΈΠ΅ ΡΡΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΡ ΠΈΒ Π½Π°Β ΠΏΠ»Π΅ΡΠΈ Π±Π»ΠΈΠ·ΠΊΠΈΡ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ². Π₯ΠΠ‘ ΡΠ°Π·Π²ΠΈΠ²Π°ΡΡΡΡ ΡΒ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΠΏΠΎΡΠ»Π΅ ΠΊΠΎΠΌΡ ΠΈΒ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΡΡ Π½Π°Π»ΠΈΡΠΈΠ΅ΠΌ Π±ΠΎΠ΄ΡΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΈ ΠΏΠΎΠ»Π½ΠΎΠΌ ΠΈΠ»ΠΈ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈ ΠΏΠΎΠ»Π½ΠΎΠΌ ΠΎΡΡΡΡΡΡΠ²ΠΈΠΈ ΠΏΡΠΈΠ·Π½Π°ΠΊΠΎΠ² ΠΎΡΠΎΠ·Π½Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ. ΠΒ Π₯ΠΠ‘ ΠΎΡΠ½ΠΎΡΡΡΡΡ Π²Π΅Π³Π΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ (ΠΠ‘) ΠΈΒ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠ·Π½Π°Π½ΠΈΡ (Π‘ΠΠ‘). Π’Π°ΠΊΠΆΠ΅ Π΄Π»Ρ ΠΎΠΏΠΈΡΠ°Π½ΠΈΡ Π½Π°ΡΠ°Π»ΡΠ½ΡΡ
ΡΡΠ°Π΄ΠΈΠΉ ΡΡΠΈΡ
ΡΠΎΡΡΠΎΡΠ½ΠΈΠΉ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ ΡΠ΅ΡΠΌΠΈΠ½ Β«ΠΏΡΠΎΠ΄Π»Π΅Π½Π½ΠΎΠ΅ Π½Π°ΡΡΡΠ΅Π½ΠΈΠ΅ ΡΠΎΠ·Π½Π°Π½ΠΈΡΒ» (ΠΠΠ‘). ΠΡΠ΄Π΅Π»ΡΠ½ΠΎ Π²ΡΠ΄Π΅Π»ΡΡΡ Π²ΡΡ
ΠΎΠ΄ ΠΈΠ·Β Π‘ΠΠ‘Β β ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅, ΠΊΠΎΡΠΎΡΠΎΠ΅ ΡΠΎΡΠΌΠΈΡΡΠ΅ΡΡΡ ΠΏΠΎΒ ΠΌΠ΅ΡΠ΅ Π²ΠΎΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΊΠΎΠ³Π½ΠΈΡΠΈΠ²Π½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ. ΠΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ°Β Π₯ΠΠ‘ ΠΎΡΠ½ΠΎΠ²ΡΠ²Π°Π΅ΡΡΡ Π½Π°Β ΠΌΠ½ΠΎΠ³ΠΎΠΊΡΠ°ΡΠ½ΠΎΠΌ ΡΡΡΡΠΊΡΡΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΌ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΎΡΠΌΠΎΡΡΠ΅ ΡΒ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΡΠΏΠ΅ΡΠΈΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΡΠΊΠ°Π» ΠΏΡΠΈ ΡΡΠ»ΠΎΠ²ΠΈΠΈ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΈΡ ΠΎΠ±ΡΠ°ΡΠΈΠΌΡΡ
ΠΏΡΠΈΡΠΈΠ½ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΡΠΎΠ·Π½Π°Π½ΠΈΡ. ΠΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΡΒ Π₯ΠΠ‘ Π²ΠΊΠ»ΡΡΠ°Π΅Ρ Π²Β ΡΠ΅Π±Ρ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΠΆΠΈΠ·Π½Π΅Π½Π½ΠΎ Π²Π°ΠΆΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ, ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠΈΡΠ°Π½ΠΈΡ ΠΈΒ Π±ΠΎΡΡΠ±Ρ ΡΒ ΡΠΈΠΏΠΈΡΠ½ΡΠΌΠΈ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡΠΌΠΈ ΠΈΒ ΡΠΎΠΏΡΡΡΡΠ²ΡΡΡΠΈΠΌΠΈ ΡΠΎΡΡΠΎΡΠ½ΠΈΡΠΌΠΈ (ΠΏΡΠΎΠ»Π΅ΠΆΠ½ΠΈ, ΡΠΏΠ°ΡΡΠΈΡΠ½ΠΎΡΡΡ, Π±ΠΎΠ»Ρ, ΠΏΠ°ΡΠΎΠΊΡΠΈΠ·ΠΌΠ°Π»ΡΠ½Π°Ρ ΡΠΈΠΌΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ Π³ΠΈΠΏΠ΅ΡΠ°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈΒ Π΄Ρ.). Π£Β ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΡΒ Π₯ΠΠ‘ Π΄ΠΎΠ»ΠΆΠ½Π° ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡΡΡ ΡΠ΅Π°Π±ΠΈΠ»ΠΈΡΠ°ΡΠΈΡ ΡΒ ΡΡΠ°ΡΡΠΈΠ΅ΠΌ ΠΌΡΠ»ΡΡΠΈΠ΄ΠΈΡΡΠΈΠΏΠ»ΠΈΠ½Π°ΡΠ½ΠΎΠΉ ΡΠ΅Π°Π±ΠΈΠ»ΠΈΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΊΠΎΠΌΠ°Π½Π΄Ρ Π²Β ΠΎΠ±ΡΠ΅ΠΌΠ΅, ΠΊΠΎΡΠΎΡΡΠΉ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ°ΠΌΠΈ ΠΈΒ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡΠΌΠΈ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°. ΠΠ°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅Π°Π±ΠΈΠ»ΠΈΡΠ°ΡΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΏΡΠΈ ΡΡΠ»ΠΎΠ²ΠΈΠΈ Π΅Π΅Β ΡΠ°Π½Π½Π΅Π³ΠΎ Π½Π°ΡΠ°Π»Π°. ΠΠ°Β Π΄Π°Π½Π½ΡΠΉ ΠΌΠΎΠΌΠ΅Π½Ρ ΠΎΠ΄Π½ΠΎΠ·Π½Π°ΡΠ½ΡΡ
Π΄ΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΡΡΠ² ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΊΠ°ΠΊΠΈΡ
-Π»ΠΈΠ±ΠΎ ΡΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ², Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π½Π°Β Π²ΠΎΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΠ΅ ΡΠΎΠ·Π½Π°Π½ΠΈΡ, Π½Π΅Β ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΎ; ΠΈΠ·ΡΡΠ°Π΅ΡΡΡ ΡΡΠ΄ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΡΠ°ΡΠΌΠ°ΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΒ Π½Π΅ΡΠ°ΡΠΌΠ°ΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ², ΠΎΠ±ΡΠ·Π°ΡΠ΅Π»ΡΠ½ΡΠΌ ΡΡΠ»ΠΎΠ²ΠΈΠ΅ΠΌ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΊΠΎΡΠΎΡΡΡ
ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½Π°Ρ ΠΊΠΎΡΡΠ΅ΠΊΡΠΈΡ ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΠ±Π»Π΅ΠΌ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°. ΠΠ°ΠΆΠ½ΡΡ ΡΠΎΠ»Ρ Π²Β Π²Π΅Π΄Π΅Π½ΠΈΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΡΒ Π₯ΠΠ‘ ΠΈΠ³ΡΠ°Π΅Ρ Π²ΠΎΠ²Π»Π΅ΡΠ΅Π½ΠΈΠ΅ Π±Π»ΠΈΠ·ΠΊΠΈΡ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°, ΠΊΠΎΡΠΎΡΡΠ΅, Π²Β ΡΠ²ΠΎΡ ΠΎΡΠ΅ΡΠ΅Π΄Ρ, Π½ΡΠΆΠ΄Π°ΡΡΡΡ Π²Β ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΠΈ ΠΎΠ±ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΎΒ ΡΠΎΡΡΠΎΡΠ½ΠΈΠΈ ΡΠ²ΠΎΠ΅Π³ΠΎ ΡΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΠΈΠΊΠ° ΠΈΒ ΠΎΒ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡΡ
ΡΠ΅Π°Π±ΠΈΠ»ΠΈΡΠ°ΡΠΈΠΈ, Π°Β ΡΠ°ΠΊΠΆΠ΅ Π²Β ΠΏΡΠΈΡ
ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΠΌΠΎΡΠΈ
Software for the frontiers of quantum chemistry:An overview of developments in the Q-Chem 5 package
This article summarizes technical advances contained in the fifth major release of the Q-Chem quantum chemistry program package, covering developments since 2015. A comprehensive library of exchangeβcorrelation functionals, along with a suite of correlated many-body methods, continues to be a hallmark of the Q-Chem software. The many-body methods include novel variants of both coupled-cluster and configuration-interaction approaches along with methods based on the algebraic diagrammatic construction and variational reduced density-matrix methods. Methods highlighted in Q-Chem 5 include a suite of tools for modeling core-level spectroscopy, methods for describing metastable resonances, methods for computing vibronic spectra, the nuclearβelectronic orbital method, and several different energy decomposition analysis techniques. High-performance capabilities including multithreaded parallelism and support for calculations on graphics processing units are described. Q-Chem boasts a community of well over 100 active academic developers, and the continuing evolution of the software is supported by an βopen teamwareβ model and an increasingly modular design
Numerical Modeling of Nonlinear Response of Seafloor Porous Saturated Soil Deposits to SH-Wave Propagation
Numerical modeling of seismic response of soil deposits is usually conducted as part of seismic hazard assessment, preceding facility construction in any tectonically active regions, including offshore sites. A significant feature of subsea soils is their porous and water-saturated structure. Thus, the purpose of the present study is to introduce a procedure for modeling nonlinear behavior of porous, moist soils during SH-wave propagation, to verify it and compare response for synthetic soil profiles with porous medium parameters specific for low moisture onshore and high moisture offshore sites with cohesive and non-cohesive soils. The well-known and approved NERA code was used as a basis and improved to incorporate the Biot and Gassman equations for elastic waves propagation in a fluid-saturated porous solid. The applicability of the presented approach was substantiated for integration into other well-known algorithms. Obtained results showed good agreement between the simulated by different methods and observed spectra. The modeling also showed that the response of cohesive and non-cohesive soils with moisture specific both for onshore and offshore sites is explained by effects of resonances and effect of seismic amplitude saturation, which, in turn, depend on the corresponding value of the layer thickness and S-wave impedance for porous saturated soil layer. The proposed scheme could have significant practical usage for studying the effect of porous medium parameters on the seismic response of the moist soil deposits