by Sandhu, Ranjit [2016-04-01]

The article reviews the Radiology Physics 300 app from Hawki Inc. which is designed for radiologists and trainees to review radiology physics.

by Whitaker, M. A. B. [2007-06-01]

J. Solomon [ Journal de Physique 4, 34 (1933)] produced an argument of great generality claiming to demonstrate the impossibility of hidden variables in quantum theory, an argument which M. Jammer [ The Philosophy of Quantum Mechanics(Wiley, New York, 1974)] said raised a number of questions. For the first time, this argument is discussed, a simple hidden variable model violating the argument is analysed in detail, and the error in the proof is located. [ABSTRACT FROM AUTHOR]

by Parodi, Giovanni [2012-10-01]

by Connell, Neville [1995-07-01]

Reports the creation of the Forum on Industrial and Applied Physics (FIAP). Objectives of FIAP; Activities of FIAP; Officers of the FIAP board.

by Bakhanov, V., Vlasov, S., Kazakov, V., Kemarskaya, O., Koposova, E., Shishkina, O. [2003-07-01]

We discuss the results of studies of surface-wave transformation by nonuniform flows, performed in the tank of the Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), and the results of modelling of the influence of iceberg motion on regular background internal waves in the subsurface pycnocline.Transformation of surface waves in the flow field past an immersed sphere is studied both experimentally and theoretically. It is shown that even fairly weak nonuniform flows can cause noticeable changes in the surface-wave field. The sizes of the spatial region in which the characteristics of the surface waves are changed exceed considerably the sizes of the nonuniform-flow region. It is found that the nonlinearity of surface waves leads to an increase in the variability of the surface-wave amplitude in a broad frequency range. The proposed theoretical model describes well the main experimentally observed features of the transformation of nonlinear surface waves in the nonuniform-flow field.It is proved experimentally that background internal waves with frequencies close to those of internal waves in an iceberg wake lead to a considerable transformation of the field of lee waves. The parameters of the resulting wave system are independent of characteristic horizontal sizes of the iceberg model and the length of the internal wave. The total wave system is stationary in the entire velocity range of the model in the case of counterpropagation of background waves. In the case of copropagation of background waves, the nature of the wave system depends on the ratio between the towing velocity and the phase velocity of background waves. In particular, the wave system in the wake can have both a pronounced nonstationary nature and a typical stationary phase pattern. [ABSTRACT FROM AUTHOR]

by Rickles, Dean [2016-09-01]

by Stephen Pople [1995]

Explaining Physics emphasizes the applications and social effects of physics, and extends its treatment of energy and electronics.* Introductory page to each unit to bring out the relevance of the material to everyday life* Simple questions at the end of each unit to consolidate learning* Helpful revision summary

by Baikov, Yu., Petrov, N. [2014-09-01]

The special features of the crystallization processes of 50% two-component metal melts in the model of transitive two-phase zone (TTZ) whose structure is described by the system of stationary kinetic transcendental equations are investigated. The influence of the TTZ structure and crystallization temperature of the system two-component metal melt - crystal on the frequencies of joining of step-growth monomers to TTZ monolayers is considered. It is demonstrated that in this case, the disordering process of two-component crystals at temperatures smaller than the Curie temperature follows the Bragg-Williams thermodynamic transition. It is noted that at the point of the two-component crystal disordering, the average crystallization rate has a singularity in the form of a finite jump whose value is proportional to the squared long-order parameter. [ABSTRACT FROM AUTHOR]

by Weisel, Gary [2017-09-01]

With the foundation of the Division of Plasma Physics of the American Physical Society in April 1959, plasma physics was presented as the general study of ionized gases. This paper investigates the degree to which plasma physics, during its first decade, established a community of interrelated specialties, one that brought together work in gaseous electronics, astrophysics, controlled thermonuclear fusion, space science, and aerospace engineering. It finds that, in some regards, the plasma community was indeed greater than the sum of its parts and that its larger identity was sometimes glimpsed in inter-specialty work and studies of fundamental plasma behaviors. Nevertheless, the plasma specialties usually worked separately for two inter-related reasons: prejudices about what constituted 'basic physics,' both in the general physics community and within the plasma community itself; and a compartmentalized funding structure, in which each funding agency served different missions. [ABSTRACT FROM AUTHOR]

by Melo, Ivan [2018-01-15]

The goal of physics is to look for the truth behind the physical phenomena. Where is the place for the beauty then? The truth can be in principle ugly in one case and aesthetically pleasing in another. Nevertheless, many physical theories can be considered as beautiful and are often formulated with aesthetic criteria in mind. These criteria include the ability to explain a lot starting from a little and/or some form of symmetry. Several examples of beautiful laws will be discussed along with opinions of particle physicists on beauty. [ABSTRACT FROM AUTHOR]

by Borrely, Thales, Taschetto, Diana [2018-07-01]

by Chen, C.-Y., Li, S.-H. [2007-03-01]

We propose a simple but practical scheme to implement a three-qubit Toffoli gate by a single resonant interaction in a trapped ion system. The scheme does not require two-qubit controlled-NOT gates but uses a three-qubit phase gate and two Hadamard gates, where the phase gate can be implemented by only a single resonant interaction of the trapped ions with the first lower vibrational sideband mode. Both the situations, with and without spontaneous ionic emission, are investigated. Discussions are made for the advantages and the experimental feasibility of our scheme. [ABSTRACT FROM AUTHOR]

by Paul Peter Urone [2012]

This introductory, algebra-based, two-semester college physics book is grounded with real-world examples, illustrations, and explanations to help students grasp key, fundamental physics concepts. College Physics includes learning objectives, concept questions, links to labs and simulations, and ample practice opportunities to solve traditional physics application problems

by Janik, Małgorzata, Kozera, Ryszard, Kozioł, Przemysław [2013-06-01]

In this paper we consider the problem of modeling curves in Rn in via interpolation without a priori specified interpolation knots. We discuss two approaches to estimate the missing knots {ti}i=0m for non-parametric data (i.e. collection of points {q=0im, where qi ∈ Rn). The first approach (uniform evaluation) is based on blind guess in which knots ... are chosen uniformly. The second approach (cumulative chord parameterization) incorporates the geometry of the distribution of data points. More precisely, the difference ... is equal to the Euclidean distance between data points qi+1 and qi. The second method partially compensates for the loss of the information carried by the reduced data. We also present the application of the above schemes for fitting non-parametric data in computer graphics (light-source motion rendering), in computer vision (image segmentation) and in physics (high velocity particles trajecinterpolationknots.parametricdataincomputergraphics(lighttory modeling). Though experiments are conducted for points in R² and R³ the entire method is equally applicable in Rn. [ABSTRACT FROM AUTHOR]

by Volchan, Sérgio B. [2004-06-01]

by Bakhoum, Ezzat G. [2002-03-01]

A number of well-known difficulties in physics resulted from merging the theory of relativity with the Compton--de Broglie wave mechanics. Two such problems were the failure of Dirac's relativistic wave equation to predict the correct velocity of the electron and the fact that the measured yield from nuclear fission was found to be substantially less than the theoretical yield. It is shown that the origin of these and other problems is the inconsistency of the relativistic mass-energy equivalence principle with the fundamental assumptions of wave mechanics. An alternative view of the concept of mass-energy equivalence that results in a very good agreement between theory and experiment is demonstrated. The conclusions of this paper will be quite important for ongoing research into such things as the current problem of the neutrino's mass. [ABSTRACT FROM AUTHOR]

by Gaffour, Lakhdar [2008-04-01]

Fundamental equations of quantum mechanics in time-varying domain are presented. The used method consists in transforming the variable domain into a fixed domain. The transformation has to be covariant in relation to the wavefunction. The new fundamental equations turn out to be a generalization of the classical equations established in a Newtonian space-time. When the time-varying domain becomes stationary, we find again the fundamental equations of the classical quantum mechanics. [ABSTRACT FROM AUTHOR]

by Ahrens, Johan, Amselem, Elias, Cabello, Adán, Bourennane, Mohamed [2013-07-12]

We report two fundamental experiments on three-level quantum systems (qutrits). The first one tests the simplest task for which quantum mechanics provides an advantage with respect to classical physics. The quantum advantage is certified by the violation of Wright's inequality, the simplest classical inequality violated by quantum mechanics. In the second experiment, we obtain contextual correlations by sequentially measuring pairs of compatible observables on a qutrit, and show the violation of Klyachko et al.'s inequality, the most fundamental noncontextuality inequality violated by qutrits. Our experiment tests exactly Klyachko et al.'s inequality, uses the same measurement procedure for each observable in every context, and implements the sequential measurements in any possible order [ABSTRACT FROM AUTHOR]

No author [1977-07-01]

The article focuses on the journal "Radiation Effects," which publishes experimental and theoretical papers of both a fundamental and applied nature. Topics included range from the physics of the effects of radiation on crystalline materials, through radiation chemistry, metallurgy, biology and biochemistry, to biophysical effects in the life molecules and in vivo physiological studies. Although the journal primarily publishes original research papers, appropriate review articles appear from time to time.

by DeVore, Ronald, Kerkyacharian, Gerard, Picard, Dominique, Temlyakov, Vladimir [2006-02-01]

Let ρ be an unknown Borel measure defined on the space Z := X × Y with X ⊂ ℝd and Y = [-M,M]. Given a set z of m samples zi =(xi,yi) drawn according to ρ, the problem of estimating a regression function fρ using these samples is considered. The main focus is to understand what is the rate of approximation, measured either in expectation or probability, that can be obtained under a given prior fρ ∈ Θ, i.e., under the assumption that fρ is in the set Θ, and what are possible algorithms for obtaining optimal or semioptimal (up to logarithms) results. The optimal rate of decay in terms of m is established for many priors given either in terms of smoothness of fρ or its rate of approximation measured in one of several ways. This optimal rate is determined by two types of results. Upper bounds are established using various tools in approximation such as entropy, widths, and linear and nonlinear approximation. Lower bounds are proved using Kullback-Leibler information together with Fano inequalities and a certain type of entropy. A distinction is drawn between algorithms which employ knowledge of the prior in the construction of the estimator and those that do not. Algorithms of the second type which are universally optimal for a certain range of priors are given. [ABSTRACT FROM AUTHOR]

by Langer, James [1999-07-01]

The writer discusses physicists' attitudes to computers as a tool for research. Today, most physicists view the computer as an important tool that helps theorists solve mathematics problems and lets experimentalists handle large data sets, but they do not see it as providing a distinct mode of research in its own right. Although it is easy to build models on computers and see what they do, it is often unjustified to say that researchers have learned anything from such exercises. Presently, the capacity of cutting-edge computers to generate huge amounts of data is increasing faster than researchers' ability to store and interpret that data. Physicists need better algorithms for solving various kinds of problems with new computing architecture and better methods for visualizing the data and extracting relevant information. Consequently, they will have to collaborate with mathematicians and computer scientists to develop these tools and more of them will have to become computing experts.

by Agrawal, Bal, Agrawal, S. [2015-01-01]

We observe, for the first time, a very large magnetism in the nano-sized (7-27 Å) punched graphene nanodisks (PGNDs) i.e., zigzag-edged triangular PGNDs (ZET-PGNDs). A first-principles method has been employed to investigate their electronic and magnetic properties. Similar to a regular or unpunched ZET-GND where the spin value scales with the linear dimension of the ZET-GND arising from the topological frustration of the π bonds and the induced spin distributions in graphene structures, the magnetic moment in a PGND increases with its size very rapidly depending on the type of punching. Two types of the punched nanodisks have been discussed. In one type of PGND, the magnetic moment of the punched out smaller GND is added to the magnetic moment of the host GND and the resultant net magnetism is, thus, equal to the sum of the magnetic moments of the host GND and that of the punched out smaller GND. In the other type of the PGND, the magnetic moment of the punched out smaller GND is subtracted from the magnetic moment of the host GND and the net value of the magnetic moment is the difference of the magnetic moments of the host GND and that of the punched out smaller GND. One may, thus, enhance the magnetism of a GND by making an appropriate choice of the punching. It may have large magnetic moments in the passivated ZET-PGNDs beyond the nanoscale at room temperature. These punched graphene fragments may be employed for the preparation of several kinds of the electronic and spintronic devices possessing exotic features. [ABSTRACT FROM AUTHOR]

by Ortiz, José D. [2013-01-01]

by Southgate, Christopher [2016-06-01]

This article considers the current state of the science-religion debate in the United Kingdom. It discusses the societies, groups, and individual scholars that shape that debate, including the dialogue between theology and physics, biology, and psychology. Attention is also given to theology's engagement with ecological issues. The article also reflects on the loss of influence of denominational Christianity within British society, and the impact both on the character of the debate and the role of the churches. Finally, some promising trajectories of development for the future are outlined. [ABSTRACT FROM AUTHOR]

by Balter, Michael [1999-04-23]

Reports the merger between the two main bodies responsible for subatomic physics in France, the National Institute of Nuclear and Particle Physics (IN2P3) and the Atomic Energy Commission's (CEA) Department of Astrophysics, Nuclear Physics, Particle Physics, and Associated Instrumentation (DAPNIA). The merger which would create a physics powerhouse; Critics and proponents of the merger.