Results 251 to 260 of about 3,366,225 (294)
Some of the next articles are maybe not open access.

Spectrum Patrolling with Crowdsourced Spectrum Sensors

IEEE INFOCOM 2018 - IEEE Conference on Computer Communications, 2018
We use a crowdsourcing approach for RF spectrum patrolling, where heterogeneous, low-cost spectrum sensors are deployed widely and are tasked with detecting unauthorized transmissions in a collaborative fashion while consuming only a limited amount of resources.
Ayon Chakraborty   +5 more
openaire   +2 more sources

Spectrum of hyperparathyroidism

The American Journal of Medicine, 1974
Abstract 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

Spectrum of cholangitis

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

On the spectrum of fullerenes

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

Photoabsorption spectrum of Be^+

Journal of the Optical Society of America B, 1985
The 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

Spectrum usage model for smart spectrum

2019 IEEE/CIC International Conference on Communications Workshops in China (ICCC Workshops), 2019
This 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

The Spectrum of Syncope

The Journal of Clinical Pharmacology, 1994
Syncope is a loss of consciousness and postural tone. Although arising suddenly from prolonged recumbency or returning from weightlessness to Earth's gravity can result in syncope from orthostatic or vasovagal effects, there are many other possible causes. These causes can he divided into several groups.
P L, Schraeder   +2 more
openaire   +2 more sources

Spectrum and Pseudo-Spectrum

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

The graphlet spectrum

Proceedings of the 26th Annual International Conference on Machine Learning, 2009
Current graph kernels suffer from two limitations: graph kernels based on counting particular types of subgraphs ignore the relative position of these subgraphs to each other, while graph kernels based on algebraic methods are limited to graphs without node labels.
Risi Kondor   +2 more
openaire   +5 more sources

Spectrum of holoprosencephaly

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

Home - About - Disclaimer - Privacy