Filters
Results 1 - 10 of 29932
Results 1 - 10 of 29932.
Search took: 0.044 seconds
Sort by: date | relevance |
AbstractAbstract
No abstract available
Original Title
Sur un etrange comportement des tachyons
Primary Subject
Record Type
Journal Article
Journal
C. R., Ser. A; v. 279(13); p. 535-536
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Pakdemirli, M.; Aksoy, Y., E-mail: mpak@cbu.edu.tr2015
AbstractAbstract
[en] The free kick problem is considered for three distinct cases: (i) no air drag or lift, (ii) linear drag, and (iii) linear drag and lift. For the first case, closed form formulas are derived for the initial velocities and angles. For the second case, two coupled algebraic equations written from the trajectory equation are given and solved numerically for the initial velocities and angles. For the third case, the equations of motion are solved approximately using perturbation techniques assuming the lift coefficient to be small compared to the drag coefficient. Because the time variable cannot be eliminated between the equations, four coupled sets of algebraic equations are solved numerically for the initial velocities and angles. All three results are compared with each other and the influences of drag and lift coefficients on the velocities and angles are outlined. (author)
Primary Subject
Source
Available from doi: https://doi.org/10.1139/cjp-2015-0274; 5 refs., 7 figs.
Record Type
Journal Article
Journal
Canadian Journal of Physics; ISSN 0008-4204;
; v. 93(11); p. 1434-1438

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
AbstractAbstract
[en] The review of works devoted to the determination of orbit and the investigation of the long-term motion of Halley's comet is presented. The first efforts to link some apparitions of the comet by one system of orbital elements as well as the attempts to recognize the past orbit by means of numerical integrations of the equations of the comet's motion are surveyed. The comparison of results obtained by different authors is discussed. 49 refs., 6 tabs. (author)
Original Title
Badania ruchu komety Halleya
Primary Subject
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Country of publication
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] In this paper, an energy pumping mechanism for locomotion is analysed. The pumping is accomplished by exerting forces perpendicular to the direction of motion. The paper attempts to demonstrate an interesting application of the classical mechanics to two sporting events: a person skating in a half pipe and a person travelling on a level surface on a skateboard. The equations of motion based on simplified mechanical models are derived using the Lagrange mechanics. The energy-pumping phenomenon is revealed through numerical simulations with simple pumping actions. The result presented in this paper can be used as an interesting class project in undergraduate mechanics or physics courses. It also motivates potential new applications of energy pumping in many engineering fields. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/0143-0807/36/1/015002; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Radial motion of photons through the Kerr spacetime is analyzed for both the black holes and the naked singularities. The regions allowed for radial motion are determined in terms of constants of motion of photons. Figures are drawn to exhibit the qualitatively different behaviour of these regions. It is shown that the qualitative behaviour is of the same character for all black holes, while it depends on the parameter α=a/M of the Kerr naked singularities. In the case of naked singularities a large vortex could be formed by photons in stable spherical orbits concentrated around the shell of zero-energy photons, located at the surface r=M. In the field of a Kerr black hole these spherical orbits may exist under the inner horizon only, and for zero-energy photons they cannot exist at all. (author)
Primary Subject
Record Type
Journal Article
Journal
Bulletin of the Astronomical Institutes of Czechoslovakia; ISSN 0004-6248;
; v. 32(1); p. 40-52

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A PET-B01 positron emission tomographic imaging system is used for detecting head and heart of human being. The movements of the detector and its construction are detailed
Primary Subject
Source
'93 national conference on computer application in modern experimental physcis and nuclear science and technology; Guilin (China); 1-6 Nov 1993
Record Type
Journal Article
Literature Type
Conference
Journal
Nuclear Electronics and Detection Technology; ISSN 0258-0934;
; CODEN HDYUEC; v. 13(suppl); p. 239-241

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] In this paper, free vibration analysis of annular Mindlin plates with free inner edge is presented. The discrete singular convolution method is used for discretization of equations of motion. Frequency values are presented illustrating the effect of boundary conditions, radius ratio, and thickness to radius ratio of the annular plate. Comparing results with those in the literature validates the present analysis. (author)
Primary Subject
Record Type
Journal Article
Journal
Arabian Journal for Science and Engineering; ISSN 1319-8025;
; v. 34(1B); p. 81-90

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Czachor, A.
Joint Inst. for Nuclear Research, Dubna (Russian Federation)2011
Joint Inst. for Nuclear Research, Dubna (Russian Federation)2011
AbstractAbstract
[en] On solving exactly relativistic equations of motion for the model molecule of two particles coupled elastically, it has been shown that in the framework of relativistic mechanics this system, and in general any closed system of interacting particles, is not inertial, In particular, the translational velocity of the mass center of such a system has, as a consequence of the nonlinearity of the equations, oscillatory components reflecting its internal transverse oscillations - it is a pulsed motion. This effect can in principle be seen in the time-of-flight experiments. The force constant of elastic coupling in the system, as seen by the observer at rest, is shown to decline with increase of the total momentum of the system
Primary Subject
Secondary Subject
Source
Available online: http://www1.jinr.ru/Pepan_letters/panl_2011_4/03_chak.pdf; 11 refs., 2 figs.
Record Type
Journal Article
Journal
Pis'ma v Zhurnal 'Fizika Ehlementarnykh Chastits i Atomnogo Yadra'; ISSN 1814-5957;
; v. 8(4/167); p. 573-580

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Primary Subject
Record Type
Journal Article
Journal
General Relativity and Gravitation; v. 5(6); p. 673-679
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] It is known that a special case of the Lagrangian of two identical charged particles up to fourth order terms has been found. The object of this paper is to derive the generalized Lagrangian by a scheme which is somewhat different from the one known. On the other hand one can then proceed to give the Hamiltonian form up to the same order. (orig.)
Primary Subject
Record Type
Journal Article
Journal
Astrophysics and Space Science; ISSN 0004-640X;
; v. 71(1); p. 239-247

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
1 | 2 | 3 | Next |