Results 21 to 30 of about 3,528,368 (298)

Second harmonic generation at the quantum-interference induced transparency in semiconductor quantum wells: The influence of permanent dipole moments [PDF]

open access: yes, 2001
The influence of permanent dipole moments of quantized states on intersubband second harmonic generation based on quantum-interference induced transparency in semiconductor quantum wells is explored using the harmonic balance method.
Ikonic, Z., Kocinac, S., Milanovic, V.
core   +1 more source

Per-Spectral Characterizations Of Some Bipartite Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2017
A graph is said to be characterized by its permanental spectrum if there is no other non-isomorphic graph with the same permanental spectrum. In this paper, we investigate when a complete bipartite graph Kp,p with some edges deleted is determined by its ...
Wu Tingzeng, Zhang Heping
doaj   +1 more source

Transitions into permanent employment in Spain : an empirical analysis for young workers [PDF]

open access: yes, 2007
We analyze the Spanish temporary workers’ transitions into permanent employment and to what extent those who become unemployed are able to achieve a permanent job.
García-Pérez, J. Ignacio   +1 more
core   +5 more sources

A systematic framework for analyzing the dynamic effects of permanent and transitory shocks [PDF]

open access: yes, 2001
This paper proposes a systematic framework for analyzing the dynamic effects of permanent and transitory shocks on a system of n economic variables. We consider a two-step orthogonolization on the residuals of a VECM with r cointegrating vectors.
Gonzalo, Jesús, Ng, Serena
core   +3 more sources

Bipartite Graphs Associated with Pell, Mersenne and Perrin Numbers

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
In this paper, we consider the relationships between the numbers of perfect matchings (1-factors) of bipartite graphs and Pell, Mersenne and Perrin Numbers.
Öteleş Ahmet
doaj   +1 more source

Role of reinforcement methods in retention of composite restorations of primary anterior teeth

open access: yesJournal of Dental School, 2019
Objectives This study aimed to evaluate the retention of composite restorations of primary anterior teeth reinforced with composite posts, glass fiber posts, para-pulpal pins with composite posts, and para-pulpal pins alone.
Ghassem Ansari   +3 more
doaj   +1 more source

Analysis of temperature characteristics of power transformer withstand short circuit shock for two seconds

open access: yesEnergy Reports, 2023
The occurrence of a short-circuit fault in a transformer results in a rapid increase in the short-circuit current, and the temperature of the transformer winding rises rapidly.
Junyang Wang   +5 more
doaj   +1 more source

Caries and premature loss of the first permanent molar in grade school children, and parents’ knowledge level, in Vargas state, Venezuela

open access: yesJournal of Oral Research, 2019
Introduction: The first permanent molars are the most affected due to age of eruption and their anatomical characteristics. Objective: to determine the prevalence of caries and premature loss of the first permanent molar in a group of grade school ...
Mariana Morales-Chávez   +1 more
doaj   +1 more source

Research on distribution of winding leakage magnetic field of three-phase dry type transformer under short-circuit condition

open access: yesEnergy Reports, 2023
Leakage flux magnitude and pattern greatly affect transformer short-circuit resistance. In this paper, finite element calculations and experimental measurements is used to calculate the leakage magnetic field of a transformer.
Tiannan Meng   +5 more
doaj   +1 more source

Immediate or delayed direct restoration does not significantly influence additional endodontic treatments and 5-year tooth survival of first molars

open access: yesActa Odontologica Scandinavica
Objective: In vitro leakage studies suggest that temporary restorations only provide a short-term seal. However, it remains unclear whether the clinical outcome is impacted by the time elapsing between the completion of a root canal treatment (RCT) and ...
Sara Olsson   +4 more
doaj   +1 more source

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