Artykuły w czasopismach: „Time Arrow”

1

Muraskin, M. "The Arrow of Time". Physics Essays 3, nr 4 (grudzień 1990): 448–52. http://dx.doi.org/10.4006/1.3033463.

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COVENEY, PETER, i ROGER HIGHFIELD. "The arrow of time". Nature 350, nr 6318 (kwiecień 1991): 456. http://dx.doi.org/10.1038/350456a0.

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PRICE, Huw. "The arrow of time". Nature 350, nr 6318 (kwiecień 1991): 456. http://dx.doi.org/10.1038/350456b0.

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Brown, H. R. "The arrow of time". Contemporary Physics 41, nr 5 (wrzesień 2000): 335–36. http://dx.doi.org/10.1080/001075100750012849.

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SCOTT, D. "The arrow of time". International Journal of Hydrogen Energy 28, nr 2 (luty 2003): 147–49. http://dx.doi.org/10.1016/s0360-3199(02)00019-8.

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Davies, P. C. W. "The arrow of time". Astronomy and Geophysics 46, nr 1 (luty 2005): 1.26–1.29. http://dx.doi.org/10.1046/j.1468-4004.2003.46126.x.

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Pécsi, Levente, Judit Pásztor i András Kakucs. "Bending-Testing of Arrows". Műszaki Tudományos Közlemények 9, nr 1 (1.10.2018): 191–94. http://dx.doi.org/10.33894/mtk-2018.09.43.

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Abstract Archery is a tradition, a style of martial arts and a competitive sport, while at the same time being an art form. The equipment consists of a bow and arrows. The deflection of the arrow is a very important characteristic, one which has a decisive influence on how and if the arrow reaches the target. This has a tremendous impact on the performance of the archer in both competition and archery demonstrations. The quantification and measurement of arrow deflection is equally important to both manufacturers and archers. It is affected by the arrow’s static bending. In this paper the bend of the arrow shall be determined.

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Beck, Nathaniel. "Time is Not A Theoretical Variable". Political Analysis 18, nr 3 (2010): 293–94. http://dx.doi.org/10.1093/pan/mpq012.

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Carter and Signorino (2010) (hereinafter “CS”) add another arrow, a simple cubic polynomial in time, to the quiver of the binary time series—cross-section data analyst; it is always good to have more arrows in one's quiver. Since comments are meant to be brief, I will discuss here only two important issues where I disagree: are cubic duration polynomials the best way to model duration dependence and whether we can substantively interpret duration dependence.

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Klein, Étienne. "What Does the “Arrow of Time” Mean?" KronoScope 16, nr 2 (27.09.2016): 187–98. http://dx.doi.org/10.1163/15685241-12341355.

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One hundred and fifty years after the work of Ludwig Boltzmann on the interpretation of the irreversibility of physical phenomena, we are still not sure what we mean when we talk of “time” or the “arrow of time.” One source of this difficulty is our tendency to confuse time and becoming: that is, the course of time and the arrow of time, two concepts that the formalisms of physics do distinguish clearly. The course of time is represented by a line on which it is customary to place a small arrow that, ironically, must not be confused with the “arrow of time.” On the one hand, this small arrow indicates that the course of time is oriented. On the other hand, the arrow of time indicates the possibility for physical systems to experience, over the course of time, changes or transformations that prevent them from returning to their initial state forever.

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Allahverdyan, Armen E., i Dominik Janzing. "Relating the thermodynamic arrow of time to the causal arrow". Journal of Statistical Mechanics: Theory and Experiment 2008, nr 04 (4.04.2008): P04001. http://dx.doi.org/10.1088/1742-5468/2008/04/p04001.

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Gargaud, Muriel, i Jacques Reisse. "From the Arrow of Time to the Arrow of Life". Earth, Moon, and Planets 98, nr 1-4 (4.10.2006): 1–9. http://dx.doi.org/10.1007/s11038-006-9085-7.

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Miralles, Ramón, Guillermo Lara, Alicia Carrión i Manuel Bou-Cabo. "Assessment of Arrow-of-Time Metrics for the Characterization of Underwater Explosions". Sensors 21, nr 17 (4.09.2021): 5952. http://dx.doi.org/10.3390/s21175952.

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Anthropogenic impulsive sound sources with high intensity are a threat to marine life and it is crucial to keep them under control to preserve the biodiversity of marine ecosystems. Underwater explosions are one of the representatives of these impulsive sound sources, and existing detection techniques are generally based on monitoring the pressure level as well as some frequency-related features. In this paper, we propose a complementary approach to the underwater explosion detection problem through assessing the arrow of time. The arrow of time of the pressure waves coming from underwater explosions conveys information about the complex characteristics of the nonlinear physical processes taking place as a consequence of the explosion to some extent. We present a thorough review of the characterization of arrows of time in time-series, and then provide specific details regarding their applications in passive acoustic monitoring. Visibility graph-based metrics, specifically the direct horizontal visibility graph of the instantaneous phase, have the best performance when assessing the arrow of time in real explosions compared to similar acoustic events of different kinds. The proposed technique has been validated in both simulations and real underwater explosions.

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Vrobel, Susie. "Ice Cubes and Hot Water Bottles". Fractals 05, nr 01 (marzec 1997): 145–51. http://dx.doi.org/10.1142/s0218348x97000140.

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Can the arrow of time we seem to perceive be explained by an overall increase in entropy? Several models suggest that the one macroscopic arrow of time which is associated with an overall increase in entropy may be identical to the arrows of time which are subject to our empirical knowledge. These models turn out to be difficult to maintain if one considers a freeze-frame picture (or one containing a minimal period of time) of nested systems of decreasing and increasing entropy. An observer who determines an arrow of time by measuring an increase or decrease in entropy must obviously be located somewhere. This observer position is in no case arbitrary — the individual situation of the observer determines, in each case, the outcome of the measurement. A fractal model suggests that the direction-generating agent is not to be found in a system's increase in entropy, but rather in the choice of the observer's position. A thought experiment involving infinitely nested ice cubes and hot water bottles leads to the conclusion that for such freeze-frames involving a minimal time span, the concepts of isolated and open systems (which otherwise are indispensable concepts for the discussion of entropy) are unsuitable. If one considers observers placed within different nested levels of the ice cube and hot water bottle universe, it will be impossible for these observers to determine whether the embedding systems add up to a total increase or decrease of entropy: we will never know whether the "outermost embedding nest" is an ice cube or a hot water bottle. An identification of the arrows of time which are subject to our empirical knowledge with an overall increase in entropy would not be plausible since there is no conceivable observer capable of monitoring the system as a whole. A fractal nested model suggests that there are nested arrows of time with differing directions. What direction we experience depends, in each case, entirely on the observer position chosen, i.e., the system we participate in. The only way to find out which arrow of time we are experiencing at the moment, say, in an ice cube, is to make contact with an observer in a hot water bottle — either with an observer in the hot water bottle embedding my ice cube or with one in the hot water bottle nested in my ice cube. The question: "Is there a way out?" must be discussed elsewhere. The arrow of time defined by an overall increase in entropy is not congruent with the arrows of time of our empirical knowledge.

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Gorshkov, Viktor K., i German N. Mansurov. "THE INFLATION THEORY. TIME ARROW". Bulletin of the Moskow State Regional University, nr 1 (2012): 139–49. http://dx.doi.org/10.18384/2224-0209-2012-1-166.

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Schulman, L. "A Computer's Arrow of Time". Entropy 7, nr 4 (6.10.2005): 221–33. http://dx.doi.org/10.3390/e7040221.

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Cranford, Steve. "The academic arrow of time". Matter 5, nr 7 (lipiec 2022): 1969–71. http://dx.doi.org/10.1016/j.matt.2022.06.007.

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Charles Li, Y., i Hong Yang. "On the arrow of time". Discrete & Continuous Dynamical Systems - S 7, nr 6 (2014): 1287–303. http://dx.doi.org/10.3934/dcdss.2014.7.1287.

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Nieuwenhuizen, Theo M. "A subquantum arrow of time". Journal of Physics: Conference Series 504 (14.04.2014): 012008. http://dx.doi.org/10.1088/1742-6596/504/1/012008.

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Hawking, S. W. "Arrow of time in cosmology". Physical Review D 32, nr 10 (15.11.1985): 2489–95. http://dx.doi.org/10.1103/physrevd.32.2489.

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Jardine-Wright, L. "Rethinking the arrow of time". Science 353, nr 6307 (29.09.2016): 1504. http://dx.doi.org/10.1126/science.aah6871.

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21

Bonnor, W. B. "The gravitational arrow of time". Physics Letters A 112, nr 1-2 (październik 1985): 26–28. http://dx.doi.org/10.1016/0375-9601(85)90454-2.

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Chang, Tsao, Peng Zhang i Kangjia Liao. "On the Arrow of Time". Journal of Modern Physics 05, nr 08 (2014): 588–90. http://dx.doi.org/10.4236/jmp.2014.58069.

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Kupervasser, Oleg, Hrvoje Nikolić i Vinko Zlatić. "The Universal Arrow of Time". Foundations of Physics 42, nr 9 (26.05.2012): 1165–85. http://dx.doi.org/10.1007/s10701-012-9662-8.

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MITTELSTRASS, JÜRGEN. "On the philosophy of time". European Review 9, nr 1 (luty 2001): 19–29. http://dx.doi.org/10.1017/s1062798701000035.

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The concept of time has always played a dominant role in philosophy and science. In modern physics, and also in philosophy of physics, it is the anisotropy of time that attracts particular attention. Taking up work by Grünbaum and others, the thermodynamic arrow of time is considered in detail, and this discussion is then extended to other time-asymmetric processes, whose relation to this arrow of time remains controversial. After that, some remarks are made about experienced time. It is the gestalt-like character of time that, in contrast to the arrow of time, reflects time in the everyday world.

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Annila, Arto, i Stanley Salthe. "Threads of Time". ISRN Thermodynamics 2012 (28.06.2012): 1–7. http://dx.doi.org/10.5402/2012/850957.

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The concept of time’s arrow is examined using the principle of least action as given in its original non-Abelian form. When every entity of nature is considered to be composed of quantized actions, such an entity will change, either by absorbing quanta from surrounding actions or by emitting quanta to the surrounding actions. In natural processes, quanta disperse from high-energy density actions to low-energy density actions in quest of consuming free energy in least time. We propose that the flux of quanta embodies the flow of time, and therefore the irreversible consumption of free energy creates time’s arrow in a fundamental physical sense. The cosmological arrow of time results from universal processes that take place, most notably, in stars and other celestial systems, where matter, that is, bound actions, combusts to photons, that is, freely propagating actions. The biological arrow of time manifests itself in maturation processes where quanta absorb to emerging functional structures, leading eventually to aging processes where quanta, on balance, emit from disintegrating organs. Mathematical analysis of an evolutionary equation of motion, given in general terms of a spontaneous symmetry breaking process of actions, reveals the reason why future paths—and the future itself—remain inherently intractable.

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Ben-Naim, Arieh. "Entropy and Time". Entropy 22, nr 4 (10.04.2020): 430. http://dx.doi.org/10.3390/e22040430.

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The idea that entropy is associated with the “arrow of time” has its roots in Clausius’s statement on the Second Law: “Entropy of the Universe always increases.” However, the explicit association of the entropy with time’s arrow arises from Eddington. In this article, we start with a brief review of the idea that the “increase in entropy” is somehow associated with the direction in which time increases. Then, we examine three different, but equivalent definitions of entropy. We find that none of these definitions indicate any hint of a relationship between entropy and time. We can, therefore, conclude that entropy is a timeless quantity. We also discuss the reasons as to why some scientists went astray in associating entropy with time’s arrow. Finally, we shall discuss Boltzmann’s H-Theorem, which is viewed by many as a proof of the Second Law of Thermodynamics.

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27

Chen, Mengfei, Hangzhen Lan, Daodong Pan i Tao Zhang. "Hydrophobic Mesoporous Silica-Coated Solid-Phase Microextraction Arrow System for the Determination of Six Biogenic Amines in Pork and Fish". Foods 12, nr 3 (28.01.2023): 578. http://dx.doi.org/10.3390/foods12030578.

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In this study, a functionalized mesoporous silica-coated solid-phase microextraction (SPME) Arrow system was developed for the enrichment of six biogenic amines (BAs) from pork and fish samples before gas chromatographic separation with a mass spectrometer as a detector. MCM-41 was utilized as the substrate material and thereby functionalized by titanate and sodium dodecyl sulfate to adjust its surface acidity and hydrophobicity, respectively. The functionalized MCM-41 (named as MCM-T-H) was coated on a bare SPME Arrow using the dipping method and polyacrylonitrile was used as the adhesive. The extraction capacity and selectivity of the MCM-T-H-SPME Arrow for six kinds of derivatized BAs were studied and compared with commercial SPME Arrows. Experimental parameters, e.g., sample volume, derivatization reagent amount, extraction time, and desorption time, which have a dramatic effect on SPME Arrow pretreatment, were optimized. Acidity enhanced MCM-T-H coating showed a much higher affinity to derivatized BAs compared to a commercial SPME Arrow in terms of extraction capacity. In addition, hydrophobicity modification significantly reduced the interference of water molecules on the interaction between MCM-T-H and the derivatized BAs. The MCM-T-H-SPME Arrow showed efficient separation and enrichment capacity for derivatized BAs from complex matrices and therefore, the sample pretreatment time was saved. According to the experimental results, the optimal condition was to add 10 μL derivatization reagent to a 10 mL sample and maintain an agitation speed of 1250 r min−1. The MCM-T-H-SPME showed excellent reproducibility (RSD < 9.8%) and fast adsorption kinetics (30 min) and desorption kinetics (5 min) for derivatized BAs under optimal conditions. In summary, the MCM-T-H-SPME Arrow based method was employed for accurate monitoring of the variations of BAs in pork and fish, and good results were achieved.

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Tomka, Steve A. "The Adoption of the Bow and Arrow: A Model Based on Experimental Performance Characteristics". American Antiquity 78, nr 3 (lipiec 2013): 553–69. http://dx.doi.org/10.7183/0002-7316.78.3.553.

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AbstractThe timing of the arrival of the bow and arrow in the New World and reasons for its adoption have long been discussed by archaeologists. It typically has been assumed that the bow and arrow provided mechanical and physical advantages over the atlatl and dart, particularly in long-range killing power. This experimental study examines the effectiveness of traditional bows and arrows to deliver lethal wounds to prey species of different sizes. The results suggest that the bow and arrow was effective in hunting prey species such as antelope and deer but ineffective in bringing down larger animals unless changes in hunting strategies were adopted. In contrast, the atlatl and dart would have excelled in large game hunting. It is proposed that the adoption of the bow and arrow and the abandonment of the atlatl and dart were conditioned by their distinct performance advantages and changes in the game species targeted over time.

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Argaman, Nathan. "Quantum Computation and Arrows of Time". Entropy 23, nr 1 (30.12.2020): 49. http://dx.doi.org/10.3390/e23010049.

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Quantum physics is surprising in many ways. One surprise is the threat to locality implied by Bell’s Theorem. Another surprise is the capacity of quantum computation, which poses a threat to the complexity-theoretic Church-Turing thesis. In both cases, the surprise may be due to taking for granted a strict arrow-of-time assumption whose applicability may be limited to the classical domain. This possibility has been noted repeatedly in the context of Bell’s Theorem. The argument concerning quantum computation is described here. Further development of models which violate this strong arrow-of-time assumption, replacing it by a weaker arrow which is yet to be identified, is called for.

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30

Stout, D. G., J. Hall, Barbara Brooke i T. Moore. "A field method for evaluating frost injury to lucerne". Journal of Agricultural Science 111, nr 3 (grudzień 1988): 536. http://dx.doi.org/10.1017/s0021859600083805.

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J. agric. Sci., Camb. (1988), 111, 171–177The Editors regret the omission from the paper of the explanation for Plate 1, facing p. 172, as follows:EXPLANATION OF PLATEExample of visual lesions used to evaluate winter injury: (a) viable buds (arrow) are white, turgid, and may be pink tipped; (b) injured buds (arrows) are dry, discoloured, limp, or Shrivelled and dry; (c) bark is more easily peeled from injured roots; (d) injured roots are soft and easily squeezed; also note white fungal mycelium; (e) non-injured (left) root interiors are white, whereas injured (right) root interiors may be discoloured; note that discoloration from disease (left arrow) must be separated from that caused by winter injury (right arrow). The extent of leaf development at the time of sampling is demonstrated in (e).

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31

Schmitz, Inka, Hanna Strauss, Ludwig Reinel i Wolfgang Einhäuser. "Attentional cueing: Gaze is harder to override than arrows". PLOS ONE 19, nr 3 (28.03.2024): e0301136. http://dx.doi.org/10.1371/journal.pone.0301136.

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Gaze is an important and potent social cue to direct others’ attention towards specific locations. However, in many situations, directional symbols, like arrows, fulfill a similar purpose. Motivated by the overarching question how artificial systems can effectively communicate directional information, we conducted two cueing experiments. In both experiments, participants were asked to identify peripheral targets appearing on the screen and respond to them as quickly as possible by a button press. Prior to the appearance of the target, a cue was presented in the center of the screen. In Experiment 1, cues were either faces or arrows that gazed or pointed in one direction, but were non-predictive of the target location. Consistent with earlier studies, we found a reaction time benefit for the side the arrow or the gaze was directed to. Extending beyond earlier research, we found that this effect was indistinguishable between the vertical and the horizontal axis and between faces and arrows. In Experiment 2, we used 100% “counter-predictive” cues; that is, the target always occurred on the side opposite to the direction of gaze or arrow. With cues without inherent directional meaning (color), we controlled for general learning effects. Despite the close quantitative match between non-predictive gaze and non-predictive arrow cues observed in Experiment 1, the reaction-time benefit for counter-predictive arrows over neutral cues is more robust than the corresponding benefit for counter-predictive gaze. This suggests that–if matched for efficacy towards their inherent direction–gaze cues are harder to override or reinterpret than arrows. This difference can be of practical relevance, for example, when designing cues in the context of human-machine interaction.

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32

Castagnino, Mario, Luis Lara i Olimpia Lombardi. "The Direction of Time: From the Global Arrow to the Local Arrow". International Journal of Theoretical Physics 42, nr 10 (październik 2003): 2487–504. http://dx.doi.org/10.1023/b:ijtp.0000005970.73704.91.

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Folkart, Barbara. "Translation and the Arrow of Time". TTR : traduction, terminologie, rédaction 2, nr 1 (1989): 19. http://dx.doi.org/10.7202/037031ar.

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Goldin, Owen. "Plato and the Arrow of Time". Ancient Philosophy 18, nr 1 (1998): 125–43. http://dx.doi.org/10.5840/ancientphil19981819.

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Abarzhi, Snezhana I., Desmon L. Hill, Annie Naveh, Kurt C. Williams i Cameron E. Wright. "Supernovae and the Arrow of Time". Entropy 24, nr 6 (14.06.2022): 829. http://dx.doi.org/10.3390/e24060829.

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Supernovae are explosions of stars and are a central problem in astrophysics. Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities develop during the star’s explosion and lead to intense interfacial RT/RM mixing of the star materials. We handle the mathematical challenges of the RT/RM problem based on the group theory approach. We directly link the conservation laws governing RT/RM dynamics to the symmetry-based momentum model, derive the model parameters, and find the analytical solutions and characteristics of RT/RM dynamics with variable accelerations in the linear, nonlinear and mixing regimes. The theory outcomes explain the astrophysical observations and yield the design of laboratory experiments. They suggest that supernova evolution is a non-equilibrium process directed by the arrow of time.

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Konushko, Vladimir I. "Where is the Time Arrow Flying?" Journal of Modern Physics 02, nr 07 (2011): 637–41. http://dx.doi.org/10.4236/jmp.2011.27074.

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Zagzebski, Linda. "Omniscience and the Arrow of Time". Faith and Philosophy 19, nr 4 (2002): 503–19. http://dx.doi.org/10.5840/faithphil200219443.

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Rice, Hugh. "ZAGZEBSKI ON THE ARROW OF TIME". Faith and Philosophy 22, nr 3 (2005): 363–69. http://dx.doi.org/10.5840/faithphil20052239.

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Konwar, Mitali, i Gauranga Dhar Baruah. "Laser, Universe and Arrow of Time". Optics and Photonics Journal 09, nr 08 (2019): 127–39. http://dx.doi.org/10.4236/opj.2019.98012.

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Israel, Werner. "Reflections on the arrow of time". Physics World 7, nr 11 (listopad 1994): 46–47. http://dx.doi.org/10.1088/2058-7058/7/11/33.

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Kestenbaum, D. "PHYSICS:Particle Decays Reveal Arrow of Time". Science 282, nr 5389 (23.10.1998): 602–3. http://dx.doi.org/10.1126/science.282.5389.602.

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Castagnino, M., i C. Laciana. "The global thermodynamic arrow of time". Classical and Quantum Gravity 19, nr 10 (30.04.2002): 2657–70. http://dx.doi.org/10.1088/0264-9381/19/10/309.

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Ellis, John, N. E. Mavromatos i D. V. Nanopoulos. "A microscopic Liouville arrow of time". Chaos, Solitons & Fractals 10, nr 2-3 (luty 1999): 345–63. http://dx.doi.org/10.1016/s0960-0779(98)00152-0.

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McInnes, Brett. "Arrow of time in string theory". Nuclear Physics B 782, nr 1-2 (październik 2007): 1–25. http://dx.doi.org/10.1016/j.nuclphysb.2007.05.005.

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Bacciagaluppi, Guido. "Probability, arrow of time and decoherence". Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 38, nr 2 (czerwiec 2007): 439–56. http://dx.doi.org/10.1016/j.shpsb.2006.04.007.

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Sidharth, B. G. "Quantized space-time and time’s arrow". Chaos, Solitons & Fractals 11, nr 7 (czerwiec 2000): 1045–46. http://dx.doi.org/10.1016/s0960-0779(98)00331-2.

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Argaman, Nathan. "A Lenient Causal Arrow of Time?" Entropy 20, nr 4 (18.04.2018): 294. http://dx.doi.org/10.3390/e20040294.

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Pruss, Alexander R. "David Lewis's Counterfactual Arrow of Time". Nous 37, nr 4 (grudzień 2003): 606–37. http://dx.doi.org/10.1046/j.1468-0068.2003.00453.x.

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Sahni, Varun, Yuri Shtanov i Aleksey Toporensky. "Arrow of time in dissipationless cosmology". Classical and Quantum Gravity 32, nr 18 (26.08.2015): 182001. http://dx.doi.org/10.1088/0264-9381/32/18/182001.

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Gogberashvili, Merab. "Algebraical Entropy and Arrow of Time". Entropy 24, nr 11 (25.10.2022): 1522. http://dx.doi.org/10.3390/e24111522.

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Usually, it is supposed that irreversibility of time appears only in macrophysics. Here, we attempt to introduce the microphysical arrow of time assuming that at a fundamental level nature could be non-associative. Obtaining numerical results of a measurement, which requires at least three ingredients: object, device and observer, in the non-associative case depends on ordering of operations and is ambiguous. We show that use of octonions as a fundamental algebra, in any measurement, leads to generation of unavoidable 18.6 bit relative entropy of the probability density functions of the active and passive transformations, which correspond to the groups G2 and SO(7), respectively. This algebraical entropy can be used to determine the arrow of time, analogically as thermodynamic entropy does.

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Artykuły w czasopismach na temat „Time Arrow”

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