Search results for "ToF"
showing 10 items of 841 documents
Ceļojošā izstāde "Johana Kristofa Broces (1742-1823) devums Latvijas novadpētniecībā: Livonijas zīmējumu un aprakstu kolekcija Latvijas Universitātes…
2019
Latvijas Universitātes Akadēmiskās bibliotēkas J. K. Broces Livonijas zīmējumu aprakstu kolekcijas izstāde Latvijas Universitātes simtgadē 2019. gadā universitātes studiju mācību filiālēs Alūksnē, Madonā, Tukumā, Bauskā, Kuldīgā, Jēkabpilī, Cēsīs
Calf circumference is an independent predictor of mortality in older adults: An approach with generalized additive models.
2021
BACKGROUND There is a wide variation in the cutoff points of body mass index (BMI) and calf circumference (CC) , and it is necessary to assess their adequacy in predicting mortality, especially in the older adults in the community. This study aimed to investigate the association of low muscle mass and underweight with mortality in older adults, comparing different cutoff points. METHODS This was a prospective study that included 796 older adults, not institutionalized, from a Brazilian city. Generalized additive models (GAMs) were used to identify cutoff points for CC and BMI, which were compared with values available in the literature. Survival analysis using Cox regression models was used…
Integrazione di dati LiDAR ed immagini aeree per il monitoraggio del territorio
2009
La necessità di acquisire, in tempi relativamente brevi, informazioni su edifici, strade, ambiente costruito e naturale, è ormai divenuta indispensabile per svariate applicazioni quali la pianificazione urbana, il controllo del territorio, il monitoraggio ambientale, etc. Le principali tecniche di acquisizione di dati utili agli scopi su esposti sono rappresentate dal rilievo da immagini aeree, satellitari e dal rilievo da laser scanner aviotrasportato. I dati maggiormente significativi che possono essere estratti dalle immagini sono essenzialmente costituiti da tutte quelle geometrie (bordi, spigoli, etc) idonee alla ricostruzione di modelli di città; tuttavia spesso queste tecniche sono i…
A LiDAR Prototype with Silicon Photomultiplier and MEMS Mirrors
2018
In this paper, we present a low cost prototype of a Time-Of-Flight (TOF) LiDAR system, employing a SiPM as photo detector and MEMS mirrors in order to steer the nanosecond pulsed optical beam with a scanning angle of +/-6°. Preliminary TOF measurements have been performed both indoor and outdoor to test the limits of the system.
TOF LiDAR with SiPM technology
2016
LiDAR (Light Detection And Ranging) systems measures the distance from the sensor to the target by determining the time between the release of the laser pulse to the receiving of the backscattered pulse. The interest in LiDAR technology has exploded in recent years since the applications are numerous. Here, we would highlight the Advanced Driver Assistance Systems (ADAS) and for rendezvous & docking operations between spacecraft. We built two LiDAR systems differing for the detector: a Silicon Photomultiplier (SiPM) and an Avalanche Photodiode (APD). The advantages of the SiPM approach has been extensively discussed in [1]. The comparison between these systems has been performed in terms of…
Comparison in terms of TOF measurements between APD and SiPM for LiDAR applications
2016
We present an experimental comparison of two LiDAR systems, employing the SiPM and the APD as photodetectors, in terms of TOF measurements differing for the distance of the target and at different intensities of ambient light. The use of the APD represents the conventional approach, while the implementation of the SiPM is innovative. The performed measurements achieved very promising results, thus demonstrating the effectiveness of our LiDAR based on SiPM.
Dust mobilization and transport in the northern Sahara during SAMUM 2006 – a meteorological overview
2009
The SAMUM field campaign in southern Morocco in May/June 2006 provides valuable data to study the emission, and the horizontal and vertical transports of mineral dust in the Northern Sahara. Radiosonde and lidar observations show differential advection of air masses with different characteristics during stable nighttime conditions and up to 5-km deep vertical mixing in the strongly convective boundary layer during the day. Lagrangian and synoptic analyses of selected dust periods point to a topographic channel from western Tunisia to central Algeria as a dust source region. Significant emission events are related to cold surges from the Mediterranean in association with eastward passing upp…
Core oligosaccharide of Escherichia coli B—the structure required for bacteriophage T4 recognition
2015
Abstract The structure of Escherichia coli B strain PCM 1935 core oligosaccharide has been investigated by 1H and 13C NMR spectroscopy, MALDI-TOF MS and ESI MSn. It was concluded that the core oligosaccharide is a pentasaccharide with the following structure: ESI MS/MS analysis revealed that the glycine (a minor component) is linked to the →3,7)- l -α- d -Hepp-(1→ residue.
Johana Kristofa Broces (Brotze, 1742-1823) dzīvesgājums un viņa rokrakstu kolekcija LU Akadēmiskajā bibliotēkā
2013
ANOTĀCIJA Promocijas darbs „Johana Kristofa Broces (Brotze, 1742-1823) dzīvesgājums un viņa rokrakstu kolekcija LU Akadēmiskajā bibliotēkā” ir interdisciplinārs humanitāro zinātņu pētījums, kas veltīts Latvijas kultūrvēsturē īpaši nozīmīgas personības biogrāfijas rekonstrukcijai un viņa darbības analīzei, un tādējādi risina bibliotēku vēstures, grāmatniecības, avotpētniecības, historiogrāfijas problēmas. Nav šaubu par to, ka pedagogs, avotpētnieks un bibliofils Broce ir viens no visspilgtākajiem Apgaismības laikmeta darbiniekiem Latvijā un Baltijā. Viņa rokrakstu un grāmatu kolekcija (kopskaitā 599 sējumi) ir kļuvusi par LU Akadēmiskās bibliotēkas dārgumu, vēsturiskās kontinuitātes apliecin…
Modulation of the Antiviral 2-5A System in Human Immunodeficiency Virus-1-Infected CEM Cells by Propentofylline
1996
2′,5′-OIigoadenylates (2-5A) play an essential role in the establishment of the antiviral state of cells exposed to virus infection. However, - after an initial increase observed in some cell lines - the activity of the interferon (IFN)-inducible, 2-5A-forming 2′,5′-oligoadenylate synthetase (2-5A synthetase) strongly decreases soon after infection of cells with the human immunodeficiency virus-1 (HIV-1). In the present report, we show that in IFN-treated human T lymphoblastoid CEM cells, the decrease in 2-5A synthetase activity had already occurred at day 1 post infection (p.i.)- At days 3 and 5 p.i., the 2-5A synthetase activity in the IFN-treated infected cells amounted to only 10-12% of…