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Tytuł:
High speed signal processing for photon counting X-ray detection
Autorzy:
Shinomiya, B.
Koike, A.
Morii, H.
Okunoyama, T.
Neo, Y.
Mimura, H.
Aoki, T.
Tematy:
X-ray
CdTe
photon counting
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/385292.pdf  Link otwiera się w nowym oknie
Opis:
Recently practical X-ray measurement systems are demanded energy distinction function. Photon-counting CdTe semiconductor detectors have a high energy resolution in a low count rate condition at room temperature. However, the energy resolution is decreased by pile-up phenomenon in a high count rate condition. In conventional signal processing, processing time estimated X-ray photon energy from the pulse waveform is about tens of microseconds. This time is depended on the pulse decay time. This paper purposes to maintain the high energy resolution by changing the signal-processing algorithm, which derived the pulse rise height of the output waveform from the CdTe detector in a high count rate condition. As a result, the pulse rise time required to estimate the pulse rise height was short about 100 ns at incident X-ray energy 60 keV. As the result of energy spectrum by using this data, the FWHM of about 11keV (at 60 keV) when the count rate of 500 kcps. This result shows the possibility that the photon counting sensor has application for the high count rate imaging without decrease of the high energy resolution.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odbiór bodźców środowiskowych przez glony Characeae sygnalizowany za pomocą ultrasłabej luminescencji
Reception of environmental stimuli by Characeae algae manifested by ultraweak luminescence
Autorzy:
Jaśkowska, A.
Dudziak, A.
Borc, R
Tematy:
photon emission
heavy metals
inhibition
Pokaż więcej
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:
https://bibliotekanauki.pl/articles/1819387.pdf  Link otwiera się w nowym oknie
Opis:
Protecting the environment requires ensuring such conditions that organisms living in it did not suffer permanent damage to their structures and life functions. This also applies to algae living in the aquatic environment. Some species of water flora especially quickly react to negative stimuli arriving from the environment. Their reactions to experienced stress may be a subtle criterion for assessing the condition of aquatic environment. To this kind of plants belong Chara, which are bioindicators of water quality. Their response to applied environmental stimuli is rapid changes of the electrical parameters of the cell membrane. Our research shows that there is also a change in the intensity of ultraweak luminescence (UWL) generated by these plants. UWL is a phenomenon that continuously accompanies processes occurring in living cells and its intensity is less than the threshold sensitivity of the human eye. The method of measurement of this little known way of Chara's response to environmental stimuli has the advantage that it is completely non-invasive for the test material. Non-invasiveness is due to the fact that the radiation emitted from the samples is measured outside the cell membrane separating the living matter from the surrounding environment. In our study, after exposure to a selected stimulus, three types of responses of plant cells were observed: 1) - after a temporary increase of UWL, there is a return to the level of light corresponding to undisturbed homeostasis (e.g. when ascorbic acid is added to the environment); 2) - after a temporary increase in the UWL, the emission of photons slightly falls and stabilizes at a new higher level of illumination (when the stress stimulus is e.g. lead acetate, the emission intensity is 2.2 times larger than in the beginning); 3) - after a sudden and significant increase of UWL, the high emission level is maintained for many hours (e.g. after adding sucrose follows a 20-fold increase of UWL). UWL curves obtained in our experiments correlate with the changes of entropy corresponding to the disturbance of homeostasis in individual cases, depending on the applied stimulus. Respectively: for 1) - an increase of entropy is temporary and is followed by a return to values before the application of the stimulus, 2) - a lasting change occurs, which consists in an increase of entropy to a new fixed level, 3) - change in entropy is so large that its value exceeds the so-called point of no return, which means that the disorder of homeostasis leads to cell death. The application of luminescence imaging technique Single Photon Counting Imaging (SPCI) to the test cells have revealed that the emission of photons from different parts of the plant has a different intensity. When the plant suffered mechanical damage by cutting pseudoleaves, the emission from the damaged sites increased dramatically. This observation allows the damage to be located. Thanks to SPCI technique, it is also possible to track over time any repair processes. The clear differentiation of UWL kinetics leads to the conclusion that monitoring its intensity can be a good research tool in environmental protection. It makes it possible to determine whether chemicals found in the aquatic environment are harmful to a given species of plants. It can be also assessed whether the degree of the harm threatens the entire population with extinction. Thus, the presented method can be used as an ecotoxicity test.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum telescope : feasibility and constraints
Autorzy:
Pollo, Agnieszka
Kurek, Aleksander
Popowicz, A.
Stebel, Tomasz
Pięta, Tomasz
Opis:
The quantum telescope is a recent idea aimed at beating the diffraction limit of spaceborne telescopes and possibly other distant target imaging systems. There is no agreement yet on the best setup of such devices, but some configurations have already been proposed. In this Letter we characterize the predicted performance of quantum telescopes and their possible limitations. Our extensive simulations confirm that the presented model of such instruments is feasible and the device can provide considerable gains in the angular resolution of imaging in the UV, optical, and infrared bands. We argue that it is generally possible to construct and manufacture such instruments using the latest or soon to be available technology. We refer to the latest literature to discuss the feasibility of the proposed QT system design.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
X-ray tube with needle-like anode
Autorzy:
Słapa, M.
Straś, W.
Traczyk, M.
Dora, J.
Snopek, M.
Gutowski, R.
Drabik, W.
Tematy:
brachytherapy
photon needle
X-ray tube
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/147038.pdf  Link otwiera się w nowym oknie
Opis:
An X-ray tube with a needle-like anode (NAXT) built in our Laboratory, its design and basic operating parameters are presented. The process of electron beam forming and influence of external and internal magnetic fields is discussed. The tube properties essential from the point of view of its application in X-ray generators as well as disadvantageous thermal effects caused by flow of heat generated in the tube target to irradiated objects are discussed. The tube is almost a point-like source of X radiation emitted into 4đ geometry; the dose rates are on the order of 1 Gy/min at the distance of 10 mm from the anode cap. Preliminary tests show the tube may be useful in brachytherapy of cancer tumors of diameter up to 30 mm. The tube may also be an interesting device in widely understood field of irradiation techniques.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results on direct photon-photon HBT measurements in square root sNN = 62.4 GeV and 200 GeV Au+Au collisions at RHIC
Autorzy:
Das, D.
Lin, G.
Chattopadhyay, S.
Chikanian, A.
Finch, E.
Nayak, T.
Panitkin, S.
Sandweiss, J.
Suaide, A.
Zhang, H.
Tematy:
RHIC
HBT
interferometry
TPC
BEMC
photon
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148364.pdf  Link otwiera się w nowym oknie
Opis:
We present the preliminary results on direct photon interferometry measurements in Au+Au collisions at square root sNN = 62.4 GeV and 200 GeV using the STAR (solenoidal tracker at RHIC) detector. Photons are reconstructed via e+/e- conversions in STAR Time Projection Chamber (TPC) and energy deposited by photons in STAR Barrel Electromagnetic Calorimeter (BEMC). The two-photon correlations are measured using (1) both photons measured with BEMC; (2) one photon from conversions and the other measured with BEMC. Both the methodologies and the possible constraints in the correlation function measurements are discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further studies of the photoproduction of isolated photons with a jet at HERA
Autorzy:
Wan Abdullah, W. A. T.
Löhr, B.
Behnke, O.
Rubinsky, I.
Cooper-Sarkar, A. M.
Stern, A.
Aushev, V.
Verbytskyi, A.
Yamazaki, Y.
Lisovyi, M.
Paul, E.
Mujkic, K.
Klanner, R.
Levchenko, B. B.
Kononenko, O.
Schörner-Sadenius, T.
Schmidke, W. B.
Golubkov, Yu. A.
Tsurugai, T.
Yamada, S.
Martin, J. F.
Catterall, C. D.
Kadenko, I.
Lohmann, W.
Makarenko, I.
Sola, V.
Gach, G.
Wichmann, K.
Schneekloth, U.
Przybycień, M.
Schwartz, J.
Malka, J.
Barakbaev, A. N.
Tokushuku, K.
Lontkovskyi, D.
Drugakov, V.
Bruni, A.
Shcheglova, L. M.
Idris, F. Mohamad
Aushev, Y.
Antonelli, S.
Aggarwal, R.
Mergelmeyer, S.
Lohrmann, E.
Kowalski, H.
Hartner, G.
Stanco, L.
Brugnera, R.
Khein, L. A.
Perrey, H.
Abramowicz, H.
Szuba, J.
Devenish, R. C. E.
Behr, J.
Wolf, G.
Bussey, P. J.
Zhmak, N.
Iudin, A.
Stopa, P.
Temiraliev, T.
Turcato, M.
Kisielewska, D.
Klein, U.
Kuprash, O.
Proskuryakov, A. S.
Adamczyk, L.
Capua, M.
Kuze, M.
Geiser, A.
Lobodzinska, E.
Lukina, O. Yu.
Maeda, J.
Korzhavina, I. A.
Iga, Y.
Singh, I.
Korol, Ie.
Ishitsuka, M.
Bartosik, N.
Zotkin, D. S.
Bertolin, A.
Spiridonov, A.
Hori, R.
Myronenko, V.
Arslan, O.
Słomiński, Wojciech
Tymieniecka, T.
Grebenyuk, J.
Kotański, Andrzej
Abt, I.
Longhin, A.
Samojlov, V.
Foster, B.
Skillicorn, I. O.
Kaur, P.
Kanno, T.
Tomaszewska, J.
Notz, D.
D’Agostini, G.
Viazlo, O.
Limentani, S.
Bachynska, O.
Olkiewicz, K.
Kondrashova, N.
Januschek, F.
Garfagnini, A.
Wing, M.
Zakharchuk, N.
Tassi, E.
Hochman, D.
Gizhko, A.
Gregor, I.
Pokrovskiy, N. S.
Boos, E. G.
Turkot, O.
Zhautykov, B. O.
Zenaiev, O.
Dolinska, G.
Dusini, S.
Nagano, K.
Grzelak, G.
Dementiev, R. K.
Roloff, P.
Bhadra, S.
Brzozowska, B.
Gueta, O.
Stefaniuk, N.
Gogota, O.
Figiel, J.
Borras, K.
Brock, I.
Behrens, U.
Shevchenko, R.
Bloch, I.
Chwastowski, J.
Kovalchuk, N.
Guzik, M.
Kaur, M.
Levy, A.
Corriveau, F.
Zawiejski, L.
Hain, W.
Trusov, V.
Kötz, U.
Schioppa, M.
Sztuk-Dambietz, J.
Stewart, T. P.
Libov, V.
Trofymov, A.
Caldwell, A.
Saxon, D. H.
Karshon, U.
Perlański, W.
Szuba, D.
Adamus, M.
Ibrahim, Z. A.
Onishchuk, Yu.
Raval, A.
Corradi, M.
Gladilin, L. K.
Bokhonov, V.
Ruspa, M.
Walczak, R.
Nobe, T.
Żarnecki, A. F.
Nigro, A.
Ciborowski, J.
Ciesielski, R.
Nowak, R. J.
Ferrando, J.
Solano, A.
Kananov, S.
Shkola, O.
Opis:
In this extended analysis using the ZEUS detector at HERA, the photoproduction of isolated photons together with a jet is measured for different ranges of the fractional photon energy, $x_{\gamma }^{meas}$, contributing to the photon-jet final state. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 6$< E_{T}^{\gamma }< 15$ GeV and $-0.7< \eta ^{\gamma }< 0.9$ and for jet transverse-energy and pseudorapidity ranges $4< E_{T}^{jet}< 35$ GeV and $- 1.5 < \eta ^{jet}< 1.8$, for an integrated luminosity of 374 pb$^{-1}$. The kinematic observables studied comprise the transverse energy and pseudorapidity of the photon and the jet, the azimuthal difference between them, the fraction of proton energy taking part in the interaction, and the difference between the pseudorapidities of the photon and the jet. Higher-order theoretical calculations are compared to the results.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Photon and Electron Interactions from Moving Photon Sources in an Inertial and non-Inertial Frames of Reference
Autorzy:
Tambunga, Gabriel James
Tematy:
Conservation
Coordinate
Electron
Energy
Momentum
Photon
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1193465.pdf  Link otwiera się w nowym oknie
Opis:
In 2016, for the first time to the author’s knowledge, the conservation of energy and momentum was balanced for an emission and absorption of a photon that results in motion of an atom or molecule [1]. This balancing was performed by reasoning and algebra. In this paper a formal balancing of the conservation laws is presented. This includes a new operator that allows a photon to be separated between an observed value of the photon, and a value that is the difference between the observed and the emitted value of the photon at the source, for a single atom in space and a single photon source. A new method for applying the conservation of momentum to an absorption and emission of a photon is also presented, where the coordinate system, for the emitted photon, is shifted so the emitted photon is moving in the same direction as the absorbed photon.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 101

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