Results 41 to 50 of about 1,577,958 (284)

Mathematical Modeling of Heat Transfer During the Retrieval of a Downhole Sampler from an Ice Borehole: The Case of Borehole 5G-5, Vostok Station

Energies
During the drilling of deep ice boreholes in Central Antarctica, one of the key tasks is to collect representative samples of the borehole fluid. The principal challenge is that, during retrieval of the downhole sampler to the surface, the sample is ...
Sergey Ignatiev, Mikhail Kuznetsov, Andrey Dmitriev   +2 more
doaj   +1 more source

Covariant Space-Time Line Elements in the Friedmann–Lemaitre–Robertson–Walker Geometry

Axioms, 2022
Most quantum gravity theories quantize space-time on the order of Planck length (ℓp ). Some of these theories, such as loop quantum gravity (LQG), predict that this discreetness could be manifested through Lorentz invariance violations (LIV) over ...
David Escors, Grazyna Kochan
doaj   +1 more source

Complex Kerr Geometry and Nonstationary Kerr Solutions

, 2003
In the frame of the Kerr-Schild approach, we consider the complex structure of Kerr geometry which is determined by a complex world line of a complex source. The real Kerr geometry is represented as a real slice of this complex structure.
A. Burinskii, A. Sen, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, Alexander Burinskii, B. Carter, B.S. De Witt, C.A. López, D. Cox, D. Ivanenko, D. Ivanenko, E. Newman, E.T. Newman, E.T. Newman, G.C. Debney, H. Ooguri, H. Ooguri, H. Ruse, O. Veblen, P.C. Vaidya, R. Penrose, R.P. Kerr, R.W. Lind, W. Israel, W. Kinnersley   +28 more
core   +1 more source

Infrared spectroscopy of NGC 1068: Probing the obscured ionizing AGN continuum [PDF]

, 1998
The ISO-SWS 2.5-45 um infrared spectroscopic observations of the nucleus of the Seyfert 2 galaxy NGC 1068 (see companion paper) are combined with a compilation of UV to IR narrow emission line data to determine the spectral energy distribution (SED) of ...
Amiel Sternberg, Antonucci R., Binette L., Binette L., Binette L., Boksenberg A., Brinkmann W., Brunner H., Butler K., Dieter Lutz, Eckhard Sturm, Erkens U., Galavis M. E., Hagai Netzer, Halpern J. P., Kormendy J., Lennon D. J., Lutz D., Lutz D., Malkan M. A., Marconi A., Mendoza C., Moorwood A. F. M., Moorwood A. F. M., Netzer H., Oliva E., Oliva E., Oliva E., Osterbrock D. E., Pedlar A., Pedlar A., Penston M. V., Penston M. V., Penston M. V., Perez E., Pottasch S. R., Puchnarewicz E. M., Reconditi M., Reinhard Genzel, Robinson A., Roche P. F., Schulz H., Schulz H., Seaton M. J., Shakura N. I., Storchi-Bergmann Th., Tal Alexander, Viegas S. M., Walter R., Walter R., Wu C.-C., Yoshida M.   +51 more
core   +5 more sources

Multicolored lines in a finite geometry

Discrete Mathematics, 1988
Let P be a set of points, partitioned into blocks \(P_ 1,...,P_ t\), and let \underbar{L} be a set of lines (subsets of P) satisfying the following conditions: (i) each line intersects at least two of the blocks (ii) any two points in distinct blocks are on a unique line (iii) any two points in the same block are on at most one line.
Zoltán Füredi, Ivo G. Rosenberg
openaire   +1 more source

THE FULFILLED EUCLIDEAN PLANE [PDF]

, 2009
The fulfilled euclidean plane is the real projective plane, completed with the infinite point of its infinite line denoted new incidence structure. This is a structure with neighbouring elements, in which the unicity of the line through two distinct ...
Vasiu, Adrian, Vasiu, Angela
core   +1 more source

On organizing principles of Discrete Differential Geometry. Geometry of spheres

, 2006
Discrete differential geometry aims to develop discrete equivalents of the geometric notions and methods of classical differential geometry. In this survey we discuss the following two fundamental Discretization Principles: the transformation group ...
Bobenko, Alexander I., Suris, Yuri B.
core   +2 more sources

Multi-Line Geometry of Qubit-Qutrit and Higher-Order Pauli Operators [PDF]

, 2007
The commutation relations of the generalized Pauli operators of a qubit-qutrit system are discussed in the newly established graph-theoretic and finite-geometrical settings.
A. Blunck, A.B. Klimov, Anne-Céline Baboin, H. Havlicek, L.M. Batten, M. Planat, M. Planat, M. Saniga, M. Saniga, M. Saniga, Metod Saniga, Michel Planat, N.D. Mermin, S. Bandyopadhyay, S.E. Payne   +14 more
core   +4 more sources

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Algorithmic Modified Denavit–Hartenberg Modeling for Robotic Manipulators Using Line Geometry

Applied Sciences
This paper proposes a kinematic modeling method for robotic manipulators by extracting the modified Denavit–Hartenberg (MDH) parameters using line geometry.
Minchang Sung, Youngjin Choi
doaj   +1 more source