Results 71 to 80 of about 134,603 (317)

SNAP Telescope [PDF]

SPIE Proceedings, 2002
Supernovae
Lampton, Michael L., Akerlof, C. W., Aldering, G., Amanullah, R., Astier, P., Barrelet, E., Bebek, C., Bergstrom, L., Bercovitz, J., Bernstein, G., Bester, M., Bonissent, A., Bower, C., Carithers, W. C., Jr., Commins, E. D., Day, C., Deustua, S. E., DiGennaro, R., Ealet, A., Ellis, R. S., Eriksson, M., Fruchter, A., Genat, J.F., Goldhaber, G., Goobar, A., Groom, D., Harris, S. E., Harvey, P. R., Heetderks, H. D., Holland, S. E., Huterer, D., Karcher, A., Kim, A. G., Kolbe, W., Krieger, B., Lafever, R., Lamoureux, J., Levi, M. E., Levin, D. S., Linder, E. V., Loken,S. C., Malina, R., Massey, R., McKay, T., McKee, S. P., Miquel, R., Mortsell, E., Mostek, N., Mufson, S., Musser, J., Nugent, P., Oluseyi, H., Pain, R., Palaio, N., Pankow, D., Perlmutter, S., Pratt, R., Prieto, E., Refregier, A., Rhodes, J., Robinson, K., Roe, N., Sholl, M., Schubnell, M., Smadja, G., Smoot, G., Spadafora, A., Tarle, G., Tomasch, A., von der Lippe, H., Vincent, R., Walder, J.P., Wang, G.   +72 more
openaire   +4 more sources

Contactless Tracking of Decomposition in Self‐Reporting Ceramic Cr‐Al‐B Coatings

Advanced Materials Interfaces, EarlyView.
Proof of concept for contactless tracking of decomposition in self‐reporting ceramic Cr‐Al‐B coatings in extreme environments by contactless resistivity measurements is demonstrated. To verify the results, high resolution in situ and ex situ methods are employed.
Peter J. Pöllmann, Sebastian Lellig, Dimitri Bogdanovski, Amir Hossein Navidi Kashani, Damian M. Holzapfel, Clio Azina, Peter Schweizer, Marcus Hans, Paula Zöll, Daniel Primetzhofer, Szilárd Kolozsvári, Peter Polcik, Johann Michler, Jochen M. Schneider   +13 more
wiley   +1 more source

The Influence of On-Orbit Micro-Vibration on Space Gravitational Wave Detection

Photonics, 2023
Large-aperture space telescopes have played an important role in space gravitational wave detection missions. Overcoming the influence of the space environment on interstellar laser distance measurement and realistic high-concentration laser distance ...
Zhiwei Chen, Chao Fang, Zhenpeng Wang, Changxiang Yan, Zhi Wang   +4 more
doaj   +1 more source

Paper Productivity of Ground-based Large Optical Telescopes from 2000 to 2009 [PDF]

, 2011
We present an analysis of the scientific ("refereed") paper productivity of the current largest (diameter >8 m) ground-based optical(-infrared) telescopes during the ten year period from 2000 to 2009. The telescopes for which we have gathered and analysed the scientific publication data are the two 10 m Keck telescopes, the four 8.2 m Very Large ...
arxiv   +1 more source

Hybrid Electroluminescence Device for On‐Demand Single Photon Generation at Room Temperature

Advanced Optical Materials, EarlyView.
New type of electroluminescent device based on hBN nanocrystals deposited on a GaN laser diode displays electrically driven emission of single photons at room temperature. Low g2(0) autocorrelation function values are achieved of < 0.2 for continuous driving and < 0.4 for on‐demand single‐photon emission.
Aleksander Rodek, Mateusz Hajdel, Kacper Oreszczuk, Anna Kafar, Muhammed Aktas, Łucja Marona, Marek Potemski, Czeslaw Skierbiszewski, Piotr Kossacki   +8 more
wiley   +1 more source

Active Optics in Astronomy: Freeform Mirror for the MESSIER Telescope Proposal

Mathematical and Computational Applications, 2018
Active optics techniques in astronomy provide high imaging quality. This paper is dedicated to highly deformable active optics that can generate non-axisymmetric aspheric surfaces—or freeform surfaces—by use of a minimum number of actuators ...
Gerard Rene Lemaitre, Pascal Vola, Eduard Muslimov   +2 more
doaj   +1 more source

Structure of distributed control system in Seimei telescope

SICE Journal of Control, Measurement, and System Integration, 2021
A segmented mirror control system is indispensable for operating an astronomical telescope which is equipped with a segmented primary mirror. In this study, we focus on the distributed control system (DCS) proposed for Seimei telescope.
Ichiro Jikuya, Daichi Uchida, Masaru Kino, Mikio Kurita, Katsuhiko Yamada   +4 more
doaj   +1 more source

Rapid Electro‐Thermal Micro‐Actuation of Flat Optics Enabled by Laser‐Induced Graphene on Colorless Polyimide Substrates

Advanced Optical Materials, EarlyView.
Laser‐induced graphene (LIG) on a colorless polyimide (CPI) substrate functions as both an electrical heater and a heat spreader, enabling rapid electro‐thermo‐optic actuation. The system achieves reflective beam scanning up to 2 kHz and diffractive beam steering with 0.5‐millidegree resolution and a 0.9 s response time, showcasing LIG‐CPI as a soft ...
Byunggi Kim, Younggeun Lee, Dongwook Yang, Kazuyoshi Fushinobu, Young‐Jin Kim, Masahiro Nomura   +5 more
wiley   +1 more source

The Measurement and Correction of Atmospheric Dispersion in 4-Meter Telescope With Adaptive Optical System

IEEE Photonics Journal, 2023
Atmospheric dispersion is a wavelength-dependent effect that affects astronomical observations performed using ground-based telescopes. The effect of atmospheric dispersion for a 4-meter telescope is analyzed and an atmospheric dispersion corrector (ADC)
Guoqing Gao, Hao Chen, Yuanyuan Tang, Wenru Li, Hua Bao, Lingxiao Li   +5 more
doaj   +1 more source

Design of Waveguide NbN‐Based Superconductor–Insulator–Superconductor Mixer for 650 GHz

Advanced Photonics Research, EarlyView.
This research work focuses on a waveguide NbN‐based superconductor–insulator–superconductor mixer operating at 650 GHz. The signal coupling circuit is designed using a waveguide‐microstrip coupling structure, and the return loss obtained is lower than −16 dB. For the mixing circuit, its return loss is less than −7.5 dB, and the return loss reduces with
Lianhao He, Fangting Lin, Xiaoyong He
wiley   +1 more source