Double beta decay of 100Mo^{100}Mo: the deformed limit

The double beta decay of $^{100}Mo$ to the ground state and excited states of $^{100}Ru$ 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 $\beta\beta$ 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

В настоящее время при решении прикладных задач повышения энергоэффективности трехфазных систем переменного тока общего назначения широко используются активные силовые фильтры, предназначенные для симметрирования нагрузки, подавления высокочастотных гармоник, уменьшения скачков напряжения и т.д. Алгоритмы управления данными силовыми полупроводниковыми устройствами реализуются в рамках геометрического, тензорного и алгебраического подходов, причем в последнем случае, основанном на использовании гиперкомплексных чисел, удается несколько упростить структуру управляющей части. Данный доклад посвящен анализу кватерниона мгновенной мощности применительно к несимметричным активно-реактивным цепям с целью определения его неактивных составляющих, подлежащих последующему исключению из общего потока электрической энергии в единицу времени.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 (1900ºC) 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 REPORTS‰Û_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