Results 251 to 260 of about 3,273,742 (291)
Some of the next articles are maybe not open access.
Spectrum usage model for smart spectrum
2019 IEEE/CIC International Conference on Communications Workshops in China (ICCC Workshops), 2019This paper focuses on a spectrum usage model in the time domain in the context of dynamic spectrum access (DSA). To achieve a sophisticated dynamic spectrum access, understanding the spectrum usage is an important task. We focus on duty cycle (DC) as a feature quantity of spectrum usage in the time domain and observed DC (O-DC) obtained from long-term ...
openaire +2 more sources
Spectrum of hyperparathyroidism
The American Journal of Medicine, 1974Abstract A new classification of hyperparathyroidism is proposed, based on data obtained by immunoassay of parathyroid hormone (PTH). The customary modifiers "primary," "secondary" and "tertiary" are avoided because they no longer have precise meaning.
E, Reiss, J M, Canterbury
openaire +2 more sources
2019
In this book all Hilbert spaces will be assumed to separable for simplicity. In this section we review some basic definitions and properties; we refer to Kato (Perturbation theory for linear operators, Die Grundlehren der mathematischen Wissenschaften, Band 132. Springer, New York, 1966), Reed and Simon (Methods of modern mathematical physics.
openaire +1 more source
In this book all Hilbert spaces will be assumed to separable for simplicity. In this section we review some basic definitions and properties; we refer to Kato (Perturbation theory for linear operators, Die Grundlehren der mathematischen Wissenschaften, Band 132. Springer, New York, 1966), Reed and Simon (Methods of modern mathematical physics.
openaire +1 more source
The American Journal of Surgery, 1975
Of 402 patients admitted with biliary disease over the last three years, cholangitis has been diagnosed in 36. This represents an 8.8 per cent overal incidence and a 33.8 per cent incidence among patients who have undergone operation or manipulation involving the common duct.
R P, Saik +3 more
openaire +2 more sources
Of 402 patients admitted with biliary disease over the last three years, cholangitis has been diagnosed in 36. This represents an 8.8 per cent overal incidence and a 33.8 per cent incidence among patients who have undergone operation or manipulation involving the common duct.
R P, Saik +3 more
openaire +2 more sources
Acta Crystallographica Section A Foundations of Crystallography, 2002
The most symmetrical C50 to C70 fullerenes with minimum numbers of pairs of adjacent pentagonal facets are considered in this paper. Like the well known C60 (35m) and C70 (10m2) fullerenes with no adjacent pentagonal facets, they appear to be stable in physical experiments and cause the visible peaks in mass spectra of carbon clusters produced by laser
Yury L, Voytekhovsky +1 more
openaire +2 more sources
The most symmetrical C50 to C70 fullerenes with minimum numbers of pairs of adjacent pentagonal facets are considered in this paper. Like the well known C60 (35m) and C70 (10m2) fullerenes with no adjacent pentagonal facets, they appear to be stable in physical experiments and cause the visible peaks in mass spectra of carbon clusters produced by laser
Yury L, Voytekhovsky +1 more
openaire +2 more sources
Photoabsorption spectrum of Be^+
Journal of the Optical Society of America B, 1985The absorption spectrum of the ion Be+ has been recorded in the vacuum ultraviolet by utilizing the method of two laser-produced plasmas. The photoionization cross sections of the outer electron for transitions of the type 2s–∊p and 2p–∊d have been measured at threshold; the values are σ = (1.5 ± 0.1) × 10−18 cm2 and σ = (2.5 ± 0.5) × 10−18 cm2 ...
E. Jannitti +4 more
openaire +1 more source
Journal of Symbolic Logic, 1990
AbstractLet T be a complete countable first order theory and λ an uncountable cardinal. Theorem 1. If T is not superstable, T has 2λ resplendent models of power λ. Theorem 2. If T is strictly superstable, then T has at least min(2λ, ℶ2) resplendent models of power λ. Theorem 3.
openaire +1 more source
AbstractLet T be a complete countable first order theory and λ an uncountable cardinal. Theorem 1. If T is not superstable, T has 2λ resplendent models of power λ. Theorem 2. If T is strictly superstable, then T has at least min(2λ, ℶ2) resplendent models of power λ. Theorem 3.
openaire +1 more source
Spectrum Sharing and Spectrum Efficiency
SSRN Electronic Journal, 2007This policy paper for an Aspen Institute Roundtable on Spectrum Policy identifies obstacles to spectrum efficiency and policy changes that would increase efficiency and sharing of wireless resources.
openaire +1 more source
The Indian Journal of Pediatrics, 2004
To conduct a clinical study of holoprosencephaly (HPE).Thirteen cases of HPE were studied regarding their clinical features, family history, and prenatal and imaging studies. Chromosomal analysis was done whenever fresh sample was available.Six cases were antenatally detected by ultrasound; four cases were stillborn.
Seema, Thakur +3 more
openaire +2 more sources
To conduct a clinical study of holoprosencephaly (HPE).Thirteen cases of HPE were studied regarding their clinical features, family history, and prenatal and imaging studies. Chromosomal analysis was done whenever fresh sample was available.Six cases were antenatally detected by ultrasound; four cases were stillborn.
Seema, Thakur +3 more
openaire +2 more sources
2011
This chapter presents some simple results on graph spectra.We assume the reader is familiar with elementary linear algebra and graph theory. Throughout, J will denote the all-1 matrix, and 1 is the all-1 vector.
Brouwer, A.E., Haemers, W.H.
openaire +1 more source
This chapter presents some simple results on graph spectra.We assume the reader is familiar with elementary linear algebra and graph theory. Throughout, J will denote the all-1 matrix, and 1 is the all-1 vector.
Brouwer, A.E., Haemers, W.H.
openaire +1 more source