Results 251 to 260 of about 164,015 (303)
Some of the next articles are maybe not open access.
Axially-symmetric space-charge flow in a decelerating space
1963To the extent that an electron beam of finite cross-section in a decelerating space can be considered as a one-diraensional problem, the theory presented by Pay, Samuel and Shockley [l] and by others [5], [6], [7] provides an adequate description of the beam at currents less than that of limiting perveance.
D. A. Dunn, R. P. Borghi, R. C. Morwood
openaire +1 more source
Journal of Social Archaeology, 2001
The problem of Orientalism as a system of classification that maps out the cultural and political boundaries between East and West has been widely discussed within the humanities and social sciences, but it has been less overtly prominent as an issue in the specific field of archaeology.
openaire +1 more source
The problem of Orientalism as a system of classification that maps out the cultural and political boundaries between East and West has been widely discussed within the humanities and social sciences, but it has been less overtly prominent as an issue in the specific field of archaeology.
openaire +1 more source
Axial mode helix antenna with exponential spacing
Microwave and Optical Technology Letters, 2007AbstractA novel wideband CP helix antenna with exponential spacing is presented in this paper. Since traveling wave current over a wide range of frequencies has been excited, it possesses better performance. Both numerical results and experimental results show that the axial ratio bandwidth of the exponential spacing helix (ESH) antenna is 58.6 ...
Can‐Hui Chen +3 more
openaire +1 more source
Portable Autorefractors for Detecting Axial Length Changes in Space
Aerospace Medicine and Human Performance, 2018INTRODUCTION: We evaluated the reproducibility of two portable, self-administered autorefractors (Netra and SVOne Pro) to assess the time course of visual changes on the ISS.METHODS: We measured cycloplegic refractive error at 5 visits at least a week apart in 13 subjects (6 women, 7 men, 30 ± 9 yr) using both devices seated and also prone with lower ...
Kseniya S, Masterova +5 more
openaire +2 more sources
Vacuum Einstein spaces with axial symmetry
Soviet Physics Journal, 1976Four classes of solutions are found to the equations Rαβ=-2σ;α σ;β and gαβ σ;αβ=0 in three-dimensional space with metric gαβdxαdxβ and signature (+ --), equivalent to the Einstein equations Rij=0 in a vacuum for the metric {Mathematical expression}.
openaire +3 more sources
Imaging of the Meninges and the Extra-Axial Spaces
Seminars in Ultrasound, CT and MRI, 2009The separate meningeal layers and extraaxial spaces are complex and can only be differentiated by pathologic processes on imaging. Differentiation of the location of such processes can be achieved using different imaging modalities. In this pictorial review we address the imaging techniques, enhancement and location patterns, and disease spread that ...
Olga, Kirmi +2 more
openaire +2 more sources
Finite Temperature Axial Anomaly in Euclidean Space
Communications in Theoretical Physics, 1985The finite temperature axial anomalies in Euclidean space are studied within the framework of perturbation theory. The axial anomalies are shown to be the same at both and .
openaire +1 more source
Moduli space metrics for axially symmetric instantons
Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences, 1994Under an axial symmetry the Yang–Mills self-duality equations for an arbitrary gauge group reduce to the Toda equation for that particular group, from which the finite action instantons (hyperbolic vortices) may be constructed. The space of such finite action instantons, with gauge equivalent solutions identified, is known as the moduli space, and ...
openaire +1 more source
A time space translation hypothesis for vertebrate axial patterning
Seminars in Cell & Developmental Biology, 2015How vertebrates generate their anterior-posterior axis is a >90-year-old unsolved probem. This mechanism clearly works very differently in vertebrates than in Drosophila. Here, we present evidence from the Amphibian Xenopus that a time space translation mechanism underlies initial axial patterning in the trunk part of the axis.
Durston, A.J., Zhu, K.
openaire +3 more sources
Constancy of Axial Spacings in Frog Sartorius Muscle during Contraction
Nature, 1965STRIATED muscles give a characteristic system of low-angle X-ray reflexions. These reflexions can be seen using preparations maintained in a normal physiological condition and still able to contract1,2. A number of axial reflexions can be observed in addition to the equatorial reflexions which arise from the hexagonal lattices of overlapping actin and ...
Huxley, H., Brown, W., Holmes, K.
openaire +3 more sources