Search results for "APD"
showing 10 items of 298 documents
Detector characterization and first coincidence tests of a Compton telescope based on LaBr3 crystals and SiPMs
2011
International audience; A Compton telescope for dose monitoring in hadron therapy consisting of several layers of continuous LaBr3 crystals coupled to silicon photomultiplier (SiPM) arrays is under development within the ENVISION project. In order to test the possibility of employing such detectors for the telescope, a detector head consisting of a continuous 16 mm×18 mm×5 mm LaBr3 crystal coupled to a SiPM array has been assembled and characterized, employing the SPIROC1 ASIC as readout electronics. The best energy resolution obtained at 511 keV is 6.5% FWHM and the timing resolution is 3.1 ns FWHM. A position determination method for continuous crystals is being tested, with promising res…
High performance detector head for PET and PET/MR with continuous crystals and SiPMs
2012
International audience; A high resolution PET detector head for small animal PET applications has been developed. The detector is composed of a 12 mm x 12 mm source continuous LYSO crystal coupled to a 64-channel monolithic SiPM matrix from FBK-irst. Crystal thicknesses of 5 mm and 10 mm have been tested, both yielding an intrinsic spatial resolution around 0.7 mm FWHM with a position determination algorithm that can also provide depth-of-interaction information. The detectors have been tested in a rotating system that makes it possible to acquire tomographic data and reconstruct images of 22Na sources. An image reconstruction method specifically adapted for continuous crystals has been emp…
Ceļš uz obligāto veselības apdrošināšanas ieviešanu Latvijā
2016
Bakalaura darba tēma - „Ceļš uz obligātās veselības apdrošināšanas ieviešanu Latvijā” tika izvēlēta, jo veselības aprūpes nozare Latvijā ir nesakārtota un tai ir nepieciešamas pārmaiņas, kā iespējamā variantā ieviešot obligāto veselības apdrošināšanu. Darbā tiek raksturots šobrīd valstī pastāvošais veselības aprūpes finansējums, analizēta obligātā veselības apdrošināšana kā tāda, pētīta obligātā veselības apdrošināšana citās valstīs un meklētas problēmas, kas liedz obligāto veselības apdrošināšanu ieviest Latvijā. Darba mērķis ir balstoties uz pieejamo literatūru, publikācijām un normatīvajiem aktiem, identificēt nozīmīgākās problēmas, kas traucē ieviest obligāto veselības apdrošināšanu Lat…
Autoservisu datu imports un apstrāde
2017
Darba mērķis ir izveidot veidu, kā apdrošināšanas kompānijas X darbinieks var lejupielādēt jaunākos autoservisu un ekspertu datus, modificēt tos (pārskatāmāk nekā sākotnējā risinājumā) un visbeidzot augšupielādēt tos datu bāzē. Paralēli tam jāmaina autoservisu atlases mehānisms un tas jāpārceļ datu bāze, lai to varētu lietot apdrošināšanas kompānijas mājaslapā. Tika izskatīti dažādi iespējami risinājumi ar kuriem varētu veikt doto datu atjaunošanu. Visbeidzot veicot sarunas ar uzdevuma pasūtītāju un konsultējoties ar kolēģiem, tika izlemts izmantot CSV failus, kuri tiktu importēti Oracle formā, lai veiktu datu saglabāšanu datu bāze. Paralēli šī risinājuma izstrādei, tika mainīts servisu atl…
PCR-fingerprinting and RAPD approaches for tracing the source of yeast contamination in a carbonated orange juice production chain.
2005
Aims: To investigate the sort and the origin of the contamination of a packed fruit juice. Methods and Results: Fifty-eight yeast isolates were collected in a survey of two different visits to a carbonated orange juice factory. In each visit, samples were collected, six times, from seven points in the production chain. For each visit, no significant differences were observed among the yeast average values obtained in the control points considered. The random amplified polymorphic DNA (RAPD) with primer P24 and the PCR-fingerprinting with the microsatellites primers (GTG)5 and (GAC)5 were used, in order to discriminate the isolates, rendering 29 composite profiles; the most frequent one (24/…
Physiological and genomic variations in rice cells recovered from direct immersion and storage in liquid nitrogen
1999
The use of cryoprotectants and slow cooling rates are routine procedures for the cryopreservation of plant cell lines. However, our results with rice (Oryza sativa L., cv. Taipei 309) show that calli can be cryopreserved by direct immersion and stored in liquid nitrogen without any cryoprotection. The efficiency of recovery using this method, as well as a conventional method was generally increased with a previous abscisic acid (ABA) treatment. Following cryopreservation, calli demonstrated some differences with respect to unfrozen calli of the same lines. Thus, resistance to freezing stress (−20°C for 2 h) increased significantly in all lines tested, irrespective of their pre-incubation wi…
Obra dispersa. José Mª Ots Capdequí [Prólogo]
1992
Sobre José María Ots Capdequí
Fusarium wilt of cyclamen : early detection and biocontrol
2016
Fusarium wilt of cyclamen is one of the most damaging diseases of cyclamen. The causal agent, Fusarium oxysporum f. sp. cyclaminis, is a soil-borne fungus. Losses can reach more than 50 % of the production. Several methods of control are available, but none of them offer an efficient and environmentally friendly solution. In this context, a project was developed in collaboration with the French institute of horticulture, Astredhor, which represents the producers, the INRA of Dijon, for its expertise on F. oxysporum and the company Agrene for its expertise in biological control. The project has two goals: i) design a molecular marker specific of Fusarium oxysporum f. sp. cyclaminis allowing …
Mono industriālie pilsētciemati: Latvijas gadījuma izpēte
2020
Maģistra darbs “Mono industriālie pilsētciemati: Latvijas gadījuma izpēte” apskata iepriekš maz pētītu plānoto mono industriālo pilsētciematu tēmu Latvijā. Maģistra darbā tiek apskatīta un analizēta literatūra par plānoto apdzīvojumu, kā arī mono industriālo aspektu, tāpat arī sociālisma kontekstu un telpiskās plānošanas pieeju Padomju Latvijā un mono industriālais apdzīvojums citās valstīs. Tiek analizēta pilsētciematu piesaiste industrijai, kā arī padziļināti apskatīta četru pilsētciematu, kas atspoguļo dažādus laikposmus, telpiskā struktūra un sociālais profils. Galvenās maģistra darbā izmantotās metodes iekļauj literatūras apskatu un analīzi, mono industriālo pilsētciematu apzināšanu, k…
Naked DNA delivery to whole pig cardiac tissue by coronary sinus retrograde injection employing non-invasive catheterization.
2010
Background Hydrodynamic injection has demonstrated to be very efficient in the liver of small animals, although this procedure must be translated to the clinical practice in a milder but no less efficient way. The present study evaluates the capacity of non-invasive interventional catheterization as a procedure for naked DNA delivery to the heart in large animals. Methods Two catheters were placed in the coronary sinus: one of them to block blood circulation and the other to retrogradely inject 50 ml of a saline solution of DNA (20 µg/ml) containing the enhanced green fluorescent protein (EGFP) gene, at a flow rate of 5 ml/s. Results The results obtained show that EGFP protein, identified b…