Results 31 to 40 of about 3,490,672 (298)

Stock Market and Motion of a Variable Mass Spring

, 2009
We establish an analogy between the motion of spring whose mass increases linearly with time and volatile stock markets dynamics within an economic model based on simple temporal demand and supply functions [J. Phys. A: Math. Gen. 33, 3637 (2000)].
Ausloos, Bartolozzi, Bouchaud, Canessa, Canessa, Canessa, Canessa, Clements, Drożdż, Drożdż, Enrique Canessa, Flores, Halliday, Queirós, Sornette, Sornette, Sornette, Sousa, Stauffer, Stauffer, Tsallis, Vandewalle, Vandewalle   +22 more
core   +1 more source

Condensation phenomena in nonlinear drift equations [PDF]

, 2013
We study nonnegative, measure-valued solutions to nonlinear drift type equations modelling concentration phenomena related to Bose-Einstein particles. In one spatial dimension, we prove existence and uniqueness for measure solutions.
Carrillo, Jose' A., Di Francesco, Marco, Toscani, Giuseppe   +2 more
core   +2 more sources

Newton’s Second Law of a particle with variable mass [PDF]

Revista Brasileira de Ensino de Física
We approach the question of the movement of a particle with variable mass observed from an inertial frame. We consider two different situations: (i) a particle whose intrinsic mass value varies over time; (ii) the center of mass (CM) of a set of ...
M.T. Thomaz
doaj   +2 more sources

Dynamical Equations, Invariants and Spectrum Generating Algebras of Mechanical Systems with Position-Dependent Mass [PDF]

, 2013
We analyze the dynamical equations obeyed by a classical system with position-dependent mass. It is shown that there is a non-conservative force quadratic in the velocity associated to the variable mass.
Cruz, Sara Cruz y, Rosas-Ortiz, Oscar
core   +4 more sources

Some Remarks about Variable Mass Systems

, 2003
We comment about the general argument given to obtain the rocket equation as it is exposed in standard textbooks. In our opinion, it can induce students to a wrong answer when solving variable mass problems.Comment: 2 ...
Alonso M, French A P, Mario J Pinheiro, Moysés Nussenzveig H, Serway R A, Sommerfeld A   +5 more
core   +1 more source

Hawking Radiation of Dirac Particles in a Variable-mass Kerr Space-time [PDF]

, 2001
Hawking effect of Dirac particles in a variable-mass Kerr space-time is investigated by using a method called as the generalized tortoise coordinate transformation.
C. Gonzalez, E. Newman, M. Ahmed, M. Carmeli, M. W. Luo, S. Chandrasekhar, S. Q. Wu, S. Sannan, S. W. Hawking, T. Damour, W. A. Hiscock, W. Bonnor, W. Kinnersley, Z. H. Li, Z. Zhao   +14 more
core   +2 more sources

On a possible approach to the variable-mass problem

, 2002
The mass operator M is introduced as an independent dynamical variable which is taken as the translation generator P_4 of the inhomogenous De Sitter group.
Foldy, Fronsdal, Fushchich, Gelfand, Gelfand, I.Yu. Krivsky, Lurçat, Mathews, Nambu, Newton, O'Raifeartaigh, Shirokov, Sokolik, Takabayashi, V.I. Fushchich, Wigner   +15 more
core   +1 more source

Why and When Are Evidence‐Based Interventions Adopted in Paediatric Supportive Care? A Qualitative Exploration of the Determinants of Photobiomodulation Implementation

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Oral mucositis is a common and debilitating side effect of childhood cancer and stem cell transplant treatments. It affects the quality of life of children and young people (CYP) and places a strain on services. Photobiomodulation is recommended for oral mucositis prevention in international guidance but is poorly implemented in UK ...
Claudia Heggie, Kara A. Gray‐Burrows, Peter F. Day, Bob Phillips, Carl A. Thompson   +4 more
wiley   +1 more source

Neural Network-Based Descent Control for Landers with Sloshing and Mass Variation: A Cascade and Adaptive PID Strategy

Aerospace
Autonomous control of lunar landers is essential for successful space missions, where precision and efficiency are crucial. This study presents a novel control strategy that leverages proportional, integral, and derivative (PID) controllers to manage the
Angel Guillermo Ortega, Afroza Shirin
doaj   +1 more source

Spinor Slow-Light and Dirac particles with variable mass

, 2010
We consider the interaction of two weak probe fields of light with an atomic ensemble coherently driven by two pairs of standing wave laser fields in a tripod-type linkage scheme.
G. Juzeliūnas, J. Otterbach, J. Ruseckas, M. Fleischhauer, R. G. Unanyan, V. Kudriašov, W. H. Louisell   +6 more
core   +1 more source