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Search Results: 1 - 10 of 632 matches for " Clock Paradox "
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The Twins Clock Paradox History and Perspectives  [PDF]
Robert L. Shuler Jr.
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.512108

The twins or clock paradox has been a subject of lively discussion and occasional disagreement among both relativists and the public for over 100 years, and continues to attract physicists who write papers giving new analyses or defending old ones, even though many physicists now consider the matter only of educational interest. This paper investigates the number of papers, which is increasing, and trends in explanations, some of which are now targeted at professional physicists and other of which are targeted at optical or radar visualization rather than problem solving. Observations of students indicate that the latest techniques help but only somewhat. An analysis is made of 21 previous treatments appearing in the education related American Journal of Physics, Einstein’s discussions and several other pedagogical papers. A new memory aid for simultaneity transformation is given that puts it on a par with “time dilation” and “length contraction” for quick and easy problem visualization. The point of view of a trailing twin is introduced to show how simultaneity changes account for missing time in the turnaround. Length contraction is treated on equal footing with time dilation, and Swann’s insight into clocks is extended to lengths. Treatments using the conventionality of simultaneity are seen as equivalent to choice of co-moving frames. Responses to difficult questions are suggested which avoid being dismissive, and engage students’ critical thinking.

Radial Electric Field in Tokamak Plasmas as a Physical Consequence of Ehrenfest’s Paradox  [PDF]
Romannikov Alexander
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.330201
Abstract: A simplified form and some possible theoretical resolutions of the so-called Ehrenfest’s Paradox are described. A relation between physical consequences of this relativistic paradox and charge density ρ of tokamak plasma is shown. Plasma experiments which could resolve the Ehrenfest’s Paradox are presented.
Comment on a Paper: “Ben-Naim’s ‘Pitfalls’: Don Quixote’s Windmill”, by Y. Fang, Open Journal of Biophysics, 2013, 3, 13-21  [PDF]
Arieh Ben-Naim
Open Journal of Biophysics (OJBIPHY) , 2013, DOI: 10.4236/ojbiphy.2013.34032

This article is a response to Fangs article which criticizes statements never made by Ben-Naim and never appeared in the literature.

On the So-Called Gibbs Paradox, and on the Real Paradox
Arieh Ben-Naim
Entropy , 2007, DOI: 10.3390/e9030133
Abstract: Two versions of the so-called Gibbs paradox are discussed. Both of these areshown to be non-paradoxes. It is also shown that there is a different real paradox that emergesfrom Gibbs writings.
Satellite Clock Error and Orbital Solution Error Estimation for Precise Navigation Applications  [PDF]
Bharati Bidikar, Gottapu Sasibhushana Rao, Laveti Ganesh, MNVS Santosh Kumar
Positioning (POS) , 2014, DOI: 10.4236/pos.2014.51003

Global Positioning System (GPS) is a satellite-based navigation system that provides a three-dimensional user position (x,y,z), velocity and time anywhere on or above the earth surface. The satellite-based position accuracy is affected by several factors such as satellite clock error, propagation path delays and receiver noise due to which the GPS does not meet the requirements of critical navigation applications such as missile navigation and category I/II/III aircraft landings. This paper emphasizes on modelling the satellite clock error and orbital solution (satellite position) error considering the signal emission time. The transmission time sent by each satellite in broadcast ephemerides is not accurate. This has to be corrected in order to obtain correct satellite position and in turn a precise receiver position. Signal transmission time or broadcast time from satellite antenna phase center is computed at the receiver using several parameters such as signal reception time, propagation time, pseudorange observed and satellite clock error correction parameters. This corrected time of transmission and broadcast orbital parameters are used for estimation of the orbital solution. The estimated orbital solution was validated with the precise ephemerides which are estimated by Jet Propulsion Laboratory (JPL), USA. The errors are estimated for a typical day data collected on 11th March 2011 from dual frequency GPS receiver located at Department of Electronics and Communication Engineering, Andhra University College of Engineering, Visakhapatnam (17.73°N/83.319°E).

A New Clock Gated Flip Flop for Pipelining Architecture  [PDF]
Krishnamoorthy Raja, Siddhan Saravanan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78119
Abstract: The objective of the work is to design a new clock gated based flip flop for pipelining architecture. In computing and consumer products, the major dynamic power is consumed in the system’s clock signal, typically about 30% to 70% of the total dynamic (switching) power consumption. Several techniques to reduce the dynamic power have been developed, of which clock gating is predominant. In this work, a new methodology is applied for gating the Flip flop by which the power will be reduced. The clock gating is employed to the pipelining stage flip flop which is active only during valid data are arrived. The methodology used in project named Selective Look-Ahead Clock Gating computes the clock enabling signals of each FF one cycle ahead of time, based on the present cycle data of those FFs on which it depends. Similarly to data-driven gating, it is capable of stopping the majority of redundant clock pulses. In this work, the circuit implementation of the various blocks of data driven clock gating is done and the results are observed. The proposed work is used for pipelining stage in microprocessor and DSP architectures. The proposed method is simulated using the quartus for cyclone 3 kit.
New Zeno and Actual Infinity  [PDF]
Casper Storm Hansen
Open Journal of Philosophy (OJPP) , 2011, DOI: 10.4236/ojpp.2011.12010
Abstract: In 1964 José Benardete invented the “New Zeno Paradox” about an infinity of gods trying to prevent a traveller from reaching his destination. In this paper it is argued, contra Priest and Yablo, that the paradox must be resolved by rejecting the possibility of actual infinity. Further, it is shown that this paradox has the same logical form as Yablo’s Paradox. It is suggested that constructivism can serve as the basis of a common solution to New Zeno and the paradoxes of truth, and a constructivist interpretation of Kripke’s theory of truth is given.
Is Alzheimer’s Disease an Irreversible Loss of Memory Function with No Hope of Return?  [PDF]
Jean-Louis Kraus
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.55047

Since Socrates memory has always been an intriguing matter. To date for the common run of people being hit by Alzheimer’s disease (AD) is “memory loss with no hope of return”. Looking at the brain matter as an ordered closed system where memory and cognition information are located, according to Loschmidt Paradox, and thermodynamically speaking, it should be possible for AD patient brains presenting severe cognitive impairments (disordered state), to move backward to the original brain ordered state. This assumption based on thermodynamic concepts may appear inconsistent with current knowledge in neurosciences on “memory and its operation”. Attempts to connect neurobiological science to quantum physics concepts may allow a breakthrough in the understanding of memory function and therefore a step ahead in the knowledge of how memory works.

The Liar Paradox  [PDF]
Kuang-Ming Wu
Open Journal of Philosophy (OJPP) , 2015, DOI: 10.4236/ojpp.2015.55032
Abstract: This essay delivers a serious message on life, at the core of reasoning, to wit, “I am a liar” self-destructive infests reasoning to undermine it to fill life with oxymora, then proposes a singing way out in music. This essay is naturally divided into three sections: one, how self-destructive the liar paradox is life-ubiquitous; two, the liar paradox as basic to logic and philosophy; and three, how to deal with the liar paradox in snake-charming, in “Tying.” In short, these pages say that “I am a liar” self-denies to self-destroy, to demolish the structure of living (Section 1) and reasoning (Section 2). Such self-demolition must be snake-charmed into deeply singing life and reasoning (Section 3).
The TCO Paradox—A Key Problem in the Diffusion of Energy Efficient Vehicles?  [PDF]
Jens Hagman, Sofia Ritzén, Jenny Janhager Stier
American Journal of Industrial and Business Management (AJIBM) , 2017, DOI: 10.4236/ajibm.2017.712090
Abstract: The aim of this paper is to explore how mainstream vehicle buyers perceive and apply Total Cost of Ownership in their vehicle choice process. All else equal, rational consumers ought to evaluate Total Cost of Ownership in order to acquire the real cost of owning a particular vehicle under consideration, unless bounded rationality is affecting their behavior. The results reveal that vehicle buyers generally are capable of understanding the relative size of individual costs that make up vehicle Total Cost of Ownership but fail to evaluate and apply multiple costs in their vehicle purchase process. Regression analysis exposes that income, educational level, stated importance of Total Cost of Ownership and the number of vehicles in the choice set have a positive association with the degree that consumers conduct an evaluation of vehicle Total Cost of Ownership. Failure to consider Total Cost of Ownership can lead to uneconomic vehicle choices, which is here labeled as the TCO paradox. This could have an especially negative effect on the diffusion of battery electric vehicles, which require a more detailed cost analysis in order to extract its low operating cost structure.
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