15,142 research outputs found
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q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
No full textWe introduce, characterise and provide a combinatorial interpretation for the so-called q-Jacobi–Stirling numbers.
This study is motivated by their key role in the (reciprocal) expansion of any power of a second order
q-differential operator having the q-classical polynomials as eigenfunctions in terms of other even order operators,
which we explicitly construct in this work. The results here obtained can be viewed as the q-version of
those given by Everitt et al. and by the first author, whilst the combinatorics of this new set of numbers is a
q-version of the Jacobi–Stirling numbers given by Gelineau and the second author
Tobin's Q and Financial Policy
No full textRecent research in macroeconomics has emphasized the importance of linking the financial and real sectors and the need for working with optimizing models. Tobin’s Q model of investment would appear to provide a framework that can satisfy these two criteria. In contrast to the original presentation of the Q model, the formal development has not recognized that the firm actively participates in a number of financial markets; in this broader context, we show that Q is likely to be an uninformative and possibly misleading signal for investment expenditures . We then endeavor to turn this negative theoretical result to positive advantage in resolving a number of empirical problems with Q models, but the modifications dictated by the theory receive little support from the data.
Fishbone instability driven by trapped fast ions in a toroidal plasma with reversed magnetic shear
No full textBased on the non-perturbative approach, the hybrid code MARS-K is applied to study fishbone (FB) instabilities driven by trapped fast ions in a toroidal plasma with q profile nearly being flat or non-monotonic. We explore the dependency of the FB with variation in the fast ion distribution, thermal particle kinetic effects, safety factor (q) profile and plasma resistivity. When the safety factor minimum value is larger than unity (i.e.), the mode can be excited by isotropic or anisotropic fast ions, with the latter strongly enhancing the mode growth rate. The mode frequency increases with increasing, and is more easily triggered in a equilibrium with two q = 1 surfaces, compared with the case with one or no q = 1 surface. Kinetic contributions from transit resonance of passing fast ions and from bounce resonance of trapped fast ions strongly enhance mode instability. The passing thermal ions induced Landau damping has a strong stabilization effect. Furthermore, in such a weak, even reversed magnetic shear plasma, the radial mode structure of FB mode monotonically decreases to zero at q = 1 flux surface instead of a step-like function, and it depends on the kinetic contributions from particles. In addition, the plasma resistivity significantly stabilizes the mode near the marginally unstable point
Selenization kinetics inCu2ZnSn(S,Se)4 solar cells prepared from nanoparticle inks
No full textEarth-abundant Cu2ZnSn(S,Se)4 (CZTSSe) thin film photovoltaic absorber layers are fabricated by annealing Cu2ZnSnS4 (CZTS) nanoparticle thin films in a selenium rich atmosphere. Systematic variation of the selenization time (5, 10, 20 and 40 min) and temperature (450, 500, 550 and 600 °C) provides insight into the kinetics of the selenization process and in particular recrystallization and grain growth. Se–S anion exchange is found to follow Avrami׳s model in which the CZTS selenization is controlled by an irregular one-dimensional process limited by metal cation re-ordering and grain boundary migration. CZTSSe grain growth is observed to follow a normal relation with a grain growth exponent close to the ideal case of equiaxed grains and the grain boundary migration energy is calculated to be 85.38 kJ/mol. These selenization variables have a fundamental influence on the quality of the resulting CZTSSe thin film and consequently the device performance. A peak device solar energy conversion efficiency of 5.4% was obtained for selenization at 500 °C for 20 min. The device efficiency was found to be highly sensitive to these variables and it is critical to obtain an appropriate balance between grain growth and thin film quality
Rich, Sturmian, and trapezoidal words
No full textIn this paper we explore various interconnections between rich words, Sturmian words, and trapezoidal words. Rich words, first introduced by the second and third authors together with J. Justin and S. Widmer, constitute a new class of finite and infinite words characterized by having the maximal number of palindromic factors. Every finite Sturmian word is rich, but not conversely. Trapezoidal words were first introduced by the first author in studying the behavior of the subword complexity of finite Sturmian words. Unfortunately this property does not characterize finite Sturmian words. In this note we show that the only trapezoidal palindromes are Sturmian. More generally we show that Sturmian palindromes can be characterized either in terms of their subword complexity (the trapezoidal property) or in terms of their palindromic complexity. We also obtain a similar characterization of rich palindromes in terms of a relation between palindromic complexity and subword complexity
54.5 Tb/s WDM Transmission over Field Deployed Fiber Enabled by Neural Network-Based Digital Pre-Distortion
No full textWe demonstrate a record 54.5 Tb/s WDM transmission at 11.35 bit/s/Hz over 48 km of field-deployed SMF connecting business and academic parks enabled by a novel joint I-Q Neural Network-based transmitter digital pre-distortion technique.Accepted Author ManuscriptTeam Sander Wahl
The qualitative research interview
No full textPurpose - Despite the growing pressure to encourage new ways of thinking about research methodology, only recently have interview methodologists begun to realize that "we cannot lift the results of interviewing out of the contexts in which they were gathered and claim them as objective data with no strings attached". The purpose of this paper is to provide additional insight based on a critical reflection of the interview as a research method drawing upon Alvesson's discussion from the neopositivist, romanticist and localist interview perspectives. Specifically, the authors focus on critical reflections of three broad categories of a continuum of interview methods: structured, semi-structured and unstructured interviews. Design/methodology/approach - The authors adopt a critical and reflexive approach to understanding the literature on interviews to develop alternative insights about the use of interviews as a qualitative research method. Findings - After examining the neopositivist (interview as a "tool") and romanticist (interview as "human encounter") perspectives on the use of the research interview, the authors adopt a localist perspective towards interviews and argue that the localist approach opens up alternative understanding of the interview process and the accounts produced provide additional insights. The insights are used to outline the skills researchers need to develop in applying the localist perspective to interviews. Originality/value - The paper provides an alternative perspective on the practice of conducting interviews, recognizing interviews as complex social and organizational phenomena rather than just a research method
Uma abordagem sistemica para o diagnostico da qualidade
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina. Centro TecnologicoA qualidade é apontada como um dos fatores determinantes da competividade de empresas fornecedoras de bens e/ou serviços. O presente trabalho proporciona uma contribuição a essas organizações na medida em que traça um perfil do grau de estruturação para a obtenção de qualidade, e recomenda ações que, implantadas de forma sistêmica, possibilitarão uma melhor utilização dos seus recursos. A metodologia aborda uma visão moderna de qualidade, baseando-se em princípios de sistema de garantia daqualidade devidamente integrados a normas internacionais, elaborando check-lists para análises das empresas consideradas. É apresentada a aplicação da metodologia proposta em uma das indústrias que serviram de base para o desenvolvimento do trabalho, visando levantar conclusões e recomendações relativas a sua elaboração e aplicação
Exotic QQ(q)over-bar(q)over-bar, QQ(q)over-bar(s)over-bar, and QQ(s)over-bar(s)over-bar states
No full textAfter constructing the possible J(P) = 0(-), 0(+), 1(-), and 1(+) QQ (q) over bar(q) over bar tetraquark interpolating currents in a systematic way, we investigate the two-point correlation functions and extract the corresponding masses with the QCD sum rule approach. We study the QQ (q) over bar(q) over bar, QQ (q) over bar(s) over bar, and QQ (s) over bar(s) over bar systems with various isospins I = 0, 1/2, 1. Our numerical analysis indicates that the masses of doubly bottomed tetraquark states are below the threshold of the two-bottom mesons, two-bottom baryons, and one doubly bottomed baryon plus one antinucleon. Very probably these doubly bottomed tetraquark states are stable. DOI: 10.1103/PhysRevD.87.014003http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000313001000005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)9ARTICLE1null8
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