Results 121 to 130 of about 441,564 (317)

Microwave Background, Backgrounds Hierarchy - Polyphony of Universe [PDF]

arXiv, 2001
We discuss the structure, physical nature, dynamic genesis of clearly detected diffuse backgrounds (radiations) in the Universe. From the point of view of Wave Universe concept it is shown, that observed Backgrounds Hierarchy (Polyphony of Universe) is close connected and causely determined by the sound velocity Hierarchy of the physical medium, cosmic
arxiv  

Cosmological Dynamics of Interacting Dark Energy and Dark Matter in f(Q)$f(Q)$ Gravity

Fortschritte der Physik, EarlyView.
Abstract In this work, the behavior of interacting dark energy (DE) and dark matter (DM) within a model of f(Q)$f(Q)$ gravity is explored, employing the standard framework of dynamical system analysis. The power‐law f(Q)$f(Q)$ model is considered, incorporating two different forms of interacting DE and DM: 3αHρm$3\alpha H\rho _m$ and α3HρmρDE$\frac ...
Gaurav N. Gadbail, Simran Arora, Phongpichit Channuie, P. K. Sahoo   +3 more
wiley   +1 more source

Transforming DIY Geiger Counter Kits into Muon Detectors for Education and Scientific Exploration

Particles
Any Geiger counter can be used as an effective cosmic ray detector on its own. In fact, it is known that even in the absence of a radioactive source, the instrument detects what is known as background radiation, which consists of various types of ...
Marco Arcani, Domenico Liguori, Andrea Frassà, Altea Renata Maria Nemolato, Omar Del Monte, Cesare Guaita   +5 more
doaj   +1 more source

Assessment of Practical Satellite Quantum Key Distribution Architectures for Current and Near‐Future Missions

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Quantum key distribution (QKD) allows the generation of cryptographic keys beyond the computational hardness paradigm and is befitting for secure data transmission requiring long‐term security. The communication distance of fiber‐based QKD, however, is limited to a few hundred kilometers due to the exponential scaling of signal attenuation ...
Davide Orsucci, Philipp Kleinpaß, Jaspar Meister, Innocenzo De Marco, Stefanie Häusler, Thomas Strang, Nino Walenta, Florian Moll   +7 more
wiley   +1 more source

Bremsstrahlung Energy Losses for Cosmic Ray Electrons and Positrons [PDF]

arXiv, 2015
Recently cosmic ray electrons and positrons, i.e. cosmic ray charged leptons, have been observed. To understand the distances from our solar system to the sources of such lepton cosmic rays, it is important to understand energy losses from cosmic electrodynamic fields.
arxiv  

The absolute temperature of the sky and the temperature of the cosmic background radiation at 600 MHz

, 1990
The absolute temperature of the sky at delta = 46.5 deg has been measured at 600 MHz (50 cm wavelength) using a differential radiometer and a cold calibrator at liquid helium temperature.
G. Sironi, M. Limon, G. Marcellino, G. Bonelli, M. Bersanelli, G. Conti, K. Reif   +6 more
semanticscholar   +1 more source

A comprehensive review of radiation shielding concrete: Properties, design, evaluation, and applications

Structural Concrete, EarlyView.
Abstract This review paper provides a comprehensive analysis of radiation shielding concrete, covering its properties, design, evaluation, and applications. It begins with an introduction, stating the objective and scope. The paper explores radiation shielding basics, including ionizing radiation, shielding principles, and materials used for shielding.
Salim Barbhuiya, Bibhuti Bhusan Das, Paul Norman, Tanvir Qureshi   +3 more
wiley   +1 more source

Correlations between 21 cm Radiation and the CMB from Active Sources

, 2010
Neutral hydrogen is ubiquitous, absorbing and emitting 21 cm radiation throughout much of the Universe's history. Active sources of perturbations, such as cosmic strings, would generate simultaneous perturbations in the distribution of neutral hydrogen ...
Aaron Berndsen, Adshead, Albrecht, Albrecht, Alvarez, Battye, Bevis, Eisenstein, Furlanetto, Gangui, Giannantonio, Gott, Hu, Hu, Jones-Smith, Kaiser, Khatri, Landriau, Levon Pogosian, Lewis, Lewis, Mark Wyman, Myers, Pogosian, Pogosian, Pogosian, Pogosian, Rees, Sachs, Santos, Sarkar, Seager, Seljak, Slosar, Turok, Vilenkin, Vincent, Wyman, Zaldarriaga, Zeldovich   +39 more
core   +1 more source

Vision at high latitudes: High sensitivity without specific boreal adaptations in photoreception in reindeer (Rangifer tarandus L.)

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The light climate at high latitudes, in particular the extended twilight of winter and the reduced diel variation in light level in midsummer and midwinter, potentially constrains visual function and the synchronisation of temporal organisation in polar species. In this
Nicholas J. C. Tyler, Robert A. E. Fosbury, David Hazlerigg, Christopher Hogg   +3 more
wiley   +1 more source

Measurements of the cosmic background radiation [PDF]

Maps of the large scale structure (theta is greater than 6 deg) of the cosmic background radiation covering 90 percent of the sky are now available. The data show a very strong 50-100 sigma (statistical error) dipole component, interpreted as being due ...
Lubin, P., Villela, T.
core   +1 more source