130 research outputs found
Double beta decay of : the deformed limit
The double beta decay of to the ground state and excited states of
is analysed in the context of the pseudo SU(3) scheme. The results
of this deformed limit are compared with the vibrational one based on the QRPA
formalism. Consistency between the deformed limit and the experimental
information is found for various transitions, although, in this
approximation some energies and B(E2) intensities cannot reproduced.Comment: 16 pages, revtex, no figures. Submmitted to Phys. Rev.
Instantaneous power analysis of three-phase linear load in the hyper-complex space
Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΠΏΡΠΈ ΡΠ΅ΡΠ΅Π½ΠΈΠΈ ΠΏΡΠΈΠΊΠ»Π°Π΄Π½ΡΡ
Π·Π°Π΄Π°Ρ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΠ½Π΅ΡΠ³ΠΎΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΡΠ΅Ρ
ΡΠ°Π·Π½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΠΊΠ° ΠΎΠ±ΡΠ΅Π³ΠΎ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΡΠΈΡΠΎΠΊΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΡΡ Π°ΠΊΡΠΈΠ²Π½ΡΠ΅ ΡΠΈΠ»ΠΎΠ²ΡΠ΅ ΡΠΈΠ»ΡΡΡΡ, ΠΏΡΠ΅Π΄Π½Π°Π·Π½Π°ΡΠ΅Π½Π½ΡΠ΅ Π΄Π»Ρ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π°Π³ΡΡΠ·ΠΊΠΈ, ΠΏΠΎΠ΄Π°Π²Π»Π΅Π½ΠΈΡ Π²ΡΡΠΎΠΊΠΎΡΠ°ΡΡΠΎΡΠ½ΡΡ
Π³Π°ΡΠΌΠΎΠ½ΠΈΠΊ, ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΡ ΡΠΊΠ°ΡΠΊΠΎΠ² Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΡ ΠΈ Ρ.Π΄. ΠΠ»Π³ΠΎΡΠΈΡΠΌΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π΄Π°Π½Π½ΡΠΌΠΈ ΡΠΈΠ»ΠΎΠ²ΡΠΌΠΈ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΡΠΌΠΈ ΡΡΡΡΠΎΠΉΡΡΠ²Π°ΠΌΠΈ ΡΠ΅Π°Π»ΠΈΠ·ΡΡΡΡΡ Π² ΡΠ°ΠΌΠΊΠ°Ρ
Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ, ΡΠ΅Π½Π·ΠΎΡΠ½ΠΎΠ³ΠΎ ΠΈ Π°Π»Π³Π΅Π±ΡΠ°ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ², ΠΏΡΠΈΡΠ΅ΠΌ Π² ΠΏΠΎΡΠ»Π΅Π΄Π½Π΅ΠΌ ΡΠ»ΡΡΠ°Π΅, ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΠΎΠΌ Π½Π° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ Π³ΠΈΠΏΠ΅ΡΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΡΠΈΡΠ΅Π», ΡΠ΄Π°Π΅ΡΡΡ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΡΠΏΡΠΎΡΡΠΈΡΡ ΡΡΡΡΠΊΡΡΡΡ ΡΠΏΡΠ°Π²Π»ΡΡΡΠ΅ΠΉ ΡΠ°ΡΡΠΈ. ΠΠ°Π½Π½ΡΠΉ Π΄ΠΎΠΊΠ»Π°Π΄ ΠΏΠΎΡΠ²ΡΡΠ΅Π½ Π°Π½Π°Π»ΠΈΠ·Ρ ΠΊΠ²Π°ΡΠ΅ΡΠ½ΠΈΠΎΠ½Π° ΠΌΠ³Π½ΠΎΠ²Π΅Π½Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΠΏΡΠΈΠΌΠ΅Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΊ Π½Π΅ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π°ΠΊΡΠΈΠ²Π½ΠΎ-ΡΠ΅Π°ΠΊΡΠΈΠ²Π½ΡΠΌ ΡΠ΅ΠΏΡΠΌ Ρ ΡΠ΅Π»ΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π΅Π³ΠΎ Π½Π΅Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΠΎΡΡΠ°Π²Π»ΡΡΡΠΈΡ
, ΠΏΠΎΠ΄Π»Π΅ΠΆΠ°ΡΠΈΡ
ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠ΅ΠΌΡ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΈΡ ΠΈΠ· ΠΎΠ±ΡΠ΅Π³ΠΎ ΠΏΠΎΡΠΎΠΊΠ° ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ½Π΅ΡΠ³ΠΈΠΈ Π² Π΅Π΄ΠΈΠ½ΠΈΡΡ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ.At present time in order to improve the power quality of AC three-phase systems the active power filters are used for load balancing, harmonic filtering, voltage flicker reduction etc. Control strategies for power semiconductor converters in these applications are implemented using the geometrical, tensor or algebraic approaches. With the last one it becomes possible to reduce the control block structure. This paper deals with an instantaneous power quaternion of unbalanced linear three-phase loads for obtaining information about the inactive component which is to be excluded from the AC electrical energy flows per unit of time
Relaxation and derelaxation of pure and hydrogenated amorphous silicon during thermal annealing experiments
The structural relaxation of pure amorphous silicon (a-Si) and hydrogenated
amorphous silicon (a-Si:H) materials, that occurs during thermal annealing
experiments, has been analysed by Raman spectroscopy and differential scanning
calorimetry. Unlike a-Si, the heat evolved from a-Si:H cannot be explained by
relaxation of the Si-Si network strain, but it reveals a derelaxation of the
bond angle strain. Since the state of relaxation after annealing is very
similar for pure and hydrogenated materials, our results give strong
experimental support to the predicted configurational gap between a-Si and
crystalline silicon.Comment: 15 pages, 3 figures, 1 table to be published in Applied Physics
Letter
Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition
The scope of this work is the systematic study of the silicidation process affecting tungsten filaments at high temperature (1900ΒΊC) used for silane decomposition in the hot-wire chemical vapour deposition technique (HWCVD). The correlation between the electrical resistance evolution of the filaments, Rfil(t), and the different stages of the their silicidation process is exposed. Said stages correspond to: the rapid formation of two WSi2 fronts at the cold ends of the filaments and their further propagation towards the middle of the filaments; and, regarding the hot central portion of the filaments: a initial stage of silicon dissolution into the tungsten bulk, with a random duration for as-manufactured filaments, followed by the inhomogeneous nucleation of W5Si3 (which is later replaced by WSi2) and its further growth towards the filaments core. An electrical model is used to obtain real-time information about the current status of the filaments silicidation process by simply monitoring their Rfil(t) evolution during the HWCVD process. It is shown that implementing an annealing pre-treatment to the filaments leads to a clearly repetitive trend in the monitored Rfil(t) signatures. The influence of hydrogen dilution of silane on the filaments silicidation process is also discussed
Classical mappings of the symplectic model and their application to the theory of large-amplitude collective motion
We study the algebra Sp(n,R) of the symplectic model, in particular for the
cases n=1,2,3, in a new way. Starting from the Poisson-bracket realization we
derive a set of partial differential equations for the generators as functions
of classical canonical variables. We obtain a solution to these equations that
represents the classical limit of a boson mapping of the algebra. The
relationship to the collective dynamics is formulated as a theorem that
associates the mapping with an exact solution of the time-dependent Hartree
approximation. This solution determines a decoupled classical symplectic
manifold, thus satisfying the criteria that define an exactly solvable model in
the theory of large amplitude collective motion. The models thus obtained also
provide a test of methods for constructing an approximately decoupled manifold
in fully realistic cases. We show that an algorithm developed in one of our
earlier works reproduces the main results of the theorem.Comment: 23 pages, LaTeX using REVTeX 3.
VLP-Based COVID-19 Vaccines: An Adaptable Technology against the Threat of New Variants.
Virus-like particles (VLPs) are a versatile, safe, and highly immunogenic vaccine platform. Recently, there are developmental vaccines targeting SARS-CoV-2, the causative agent of COVID-19. The COVID-19 pandemic affected humanity worldwide, bringing out incomputable human and financial losses. The race for better, more efficacious vaccines is happening almost simultaneously as the virus increasingly produces variants of concern (VOCs). The VOCs Alpha, Beta, Gamma, and Delta share common mutations mainly in the spike receptor-binding domain (RBD), demonstrating convergent evolution, associated with increased transmissibility and immune evasion. Thus, the identification and understanding of these mutations is crucial for the production of new, optimized vaccines. The use of a very flexible vaccine platform in COVID-19 vaccine development is an important feature that cannot be ignored. Incorporating the spike protein and its variations into VLP vaccines is a desirable strategy as the morphology and size of VLPs allows for better presentation of several different antigens. Furthermore, VLPs elicit robust humoral and cellular immune responses, which are safe, and have been studied not only against SARS-CoV-2 but against other coronaviruses as well. Here, we describe the recent advances and improvements in vaccine development using VLP technology
EIGHTH ANNUAL REPORT ON THE OPERATIONS AND CONDITION OF THE FREE ACADEMY, BY THE BOARD OF EDUCATION OF THE CITY OF NEW YORK. JULY, 1856.
Report eight from the fourth bound volume of ten which documents in part the first nineteen years of The Free Academy, the predecessor of the educational institution, City College of New York. FREE ACADEMY. ANNUAL REPORTS. I . [NEW YORK CITY. BOARD OF EDUCATION REPORTSβ°Γ_ON FREE ACADEMY. 1851-1856.] includes 8 individual reports. At a time when municipal education constituted primary schooling, citizens united in response to arguments presented by a merchant and Board of Education President, Townsend Harris, for the necessity of an institution that would provide advanced training for future generations of citizens to fully engage in the professions advantageous to an expanding urban center. Includes preliminary reports that commented on the application of resources for the creation of the institution and the annual reports of the faculty, demonstrating accountability to the Board of Education with regard to the operation of the facility., EIGHTH ANNUAL REPORT ON THE OPERATIONS AND CONDITION OF THE FREE ACADEMY, BY THE BOARD OF EDUCATION OF THE CITY OF NEW YORK. JULY, 1856. [To the Common Council of the City of New York, and to the Board of Regents of the University of the State of New York.] [85 PAGES (1-85), 1856.], RG
EIGHTH ANNUAL REPORT ON THE OPERATIONS AND CONDITION OF THE FREE ACADEMY, BY THE BOARD OF EDUCATION OF THE CITY OF NEW YORK. JULY, 1856
A second report from the fifth bound volume of ten which documents in part the first nineteen years of The Free Academy, the predecessor of the educational institution, City College of New York. The selection from C.C.N.Y. Documents. [FREE ACADEMY OF NEW YORK / COLLEGE OF THE CITY OF NEW YORK. MISC. REPORTS. 1855-1888.] includes 2 individual reports. At a time when municipal education constituted primary schooling, citizens united in response to arguments presented by a merchant and Board of Education President, Townsend Harris, for the necessity of an institution that would provide advanced training for future generations of citizens to fully engage in the professions advantageous to an expanding urban center. Includes preliminary reports that commented on the application of resources for the creation of the institution and the annual reports of the faculty, demonstrating accountability to the Board of Education with regard to the operation of the facility., EIGHTH ANNUAL REPORT ON THE OPERATIONS AND CONDITION OF THE FREE ACADEMY, BY THE BOARD OF EDUCATION OF THE CITY OF NEW YORK. JULY, 1856, RG
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