Results 31 to 40 of about 2,572,860 (288)

Experimental Study of Silent Sonar

Archives of Acoustics, 2014
Stealth is a frequent requirement in military applications and involves the use of devices whose signals are difficult to intercept or identify by the enemy.
Jacek MARSZAL
doaj   +1 more source

Direct Distance Measurements to Superluminal Radio Sources [PDF]

, 2000
We present a new technique for directly measuring the distances to superluminal radio sources. By comparing the observed proper motions of components in a parsec scale radio jet to their measured Doppler factors, we can deduce the distance to the radio ...
Bobo G., D. C. Homan, Eichler D., Gould R. J., J. F. C. Wardle, Krichbaum T. P., Laing R. A., Lynden-Bell D., Singal A. K., Yahil A.   +9 more
core   +3 more sources

Can molecular motors drive distance measurements in injured neurons? [PDF]

PLoS Computational Biology, 2009
Injury to nerve axons induces diverse responses in neuronal cell bodies, some of which are influenced by the distance from the site of injury. This suggests that neurons have the capacity to estimate the distance of the injury site from their cell body ...
Naaman Kam, Yitzhak Pilpel, Mike Fainzilber   +2 more
doaj   +1 more source

The Hubble Constant determined through an inverse distance ladder including quasar time delays and Type Ia supernovae

, 2019
Context. The precise determination of the present-day expansion rate of the Universe, expressed through the Hubble constant $H_0$, is one of the most pressing challenges in modern cosmology.
Birrer, S., Bonvin, V., Courbin, F., Jee, I., Komatsu, E., Rusu, C. E., Shajib, A. J., Suyu, S. H., Taubenberger, S., Wong, K. C.   +9 more
core   +1 more source

Improving Performance of Bluetooth Low Energy-Based Localization System Using Proximity Sensors and Far-Infrared Thermal Sensor Arrays

Sensors
This paper presents the concept of a hybrid positioning scheme using results from a Bluetooth Low Energy (BLE)-based system and additional infrared (IR) devices: proximity sensors and far-infrared thermal sensor arrays.
Vitomir Djaja-Josko, Marcin Kolakowski, Jacek Cichocki, Jerzy Kolakowski   +3 more
doaj   +1 more source

Modification to the Luminosity Distance Redshift Relation in Modified Gravity Theories

, 2009
We derive an expression for the luminosity distance as a function of redshift for a flat Robertson-Walker spacetime perturbed by arbitrary scalar perturbations possibly produced by a modified gravity theory with two different scalar perturbation ...
C. M. Will, Eran Rosenthal, G. F. R. Ellis, I. M. H. Etherington, Ira M. Wasserman, J. Yadav, M. Sasaki, P. J. E. Peebles, R. M. Wald, Éanna É. Flanagan   +9 more
core   +1 more source

K-band versus I-band Surface Brightness Fluctuations as distance indicators [PDF]

, 2001
We evaluate the method of optical and infrared Surface Brightness Fluctuations (SBF) as a distance indicator and its application on 8-m class telescopes, such as the Very Large Telescope (VLT).
Ajhar, Bertin, Blakeslee, Blakeslee, Bruzual, Buzzoni, Charlot, Cowie, D. R. Silva, Elston, Feast, Ferrarese, Fluks, Freedman, Freedman, Grillmair, Gunn, Harris, Jensen, Jensen, Jensen, Kauffmann, Lauer, Lejeune, Liu, Luppino, Mei, Mei, P. J. Quinn, Pahre, Pahre, Persson, S. Mei, Silva, Smail, Sodemann, Sodemann, Thomsen, Tonry, Tonry, Tonry, Tonry, Tonry, Worthey, Worthey   +44 more
core   +2 more sources

Distance Measurements Related to Cartesian Product of Cycles

Journal of Mathematics, 2020
Graph theory and its wide applications in natural sciences and social sciences open a new era of research. Making the graph of computer networks and analyzing it with aid of graph theory are extensively studied and researched in the literature.
Xiaoli Qiang, Saima Nazeer, Yu-Ming Chu, Muhammad Awais Umar, Imrana Kousar, Ammara Sehar   +5 more
doaj   +1 more source

Improving Cosmological Distance Measurements Using Twin Type Ia Supernovae

, 2015
We introduce a method for identifying "twin" Type Ia supernovae, and using them to improve distance measurements. This novel approach to Type Ia supernova standardization is made possible by spectrophotometric time series observations from the Nearby ...
A. G. Kim, B. A. Weaver, B. Hayden, C. Aragon, C. Baltay, C. Buton, C. Saunders, C. Sofiatti, C. Tao, D. Baugh, D. Fouchez, D. Rabinowitz, D. Rubin, E. Gangler, E. Pecontal, G. Aldering, G. Smadja, H. K. Fakhouri, J. Chen, J. Nordin, J. Ren, K. Barbary, K. Boone, K. Runge, M. Childress, M. Fleury, M. Kowalski, M. Rigault, M. Strovink, N. Chotard, N. Suzuki, null null, P. Antilogus, P. Fagrelius, P.-F. Leget, R. C. Thomas, R. Pain, R. Pereira, R. Scalzo, S. Bailey, S. Bongard, S. Lombardo, S. Perlmutter, U. Feindt, Y. Copin   +44 more
core   +3 more sources

The Infrared Surface Brightness Fluctuation Distances to the Hydra and Coma Clusters [PDF]

, 1998
We present IR surface brightness fluctuation (SBF) distance measurements to NGC 4889 in the Coma cluster and to NGC 3309 and NGC 3311 in the Hydra cluster.
Casali M., Feast M. W., Gerard A. Luppino, John L. Tonry, Joseph B. Jensen, Wainscoat R.   +5 more
core   +2 more sources