Search results for "laitteet"
showing 10 items of 242 documents
Radioactivity control strategy for the JUNO detector
2021
JUNO is a massive liquid scintillator detector with a primary scientific goal of determining the neutrino mass ordering by studying the oscillated anti-neutrino flux coming from two nuclear power plants at 53 km distance. The expected signal anti-neutrino interaction rate is only 60 counts per day (cpd), therefore a careful control of the background sources due to radioactivity is critical. In particular, natural radioactivity present in all materials and in the environment represents a serious issue that could impair the sensitivity of the experiment if appropriate countermeasures were not foreseen. In this paper we discuss the background reduction strategies undertaken by the JUNO collabo…
In-flight recoil separators RITU and MARA and the standard detector setups
2023
In-flight recoil separators RITU and MARA at Jyväskylä Accelerator Laboratory are complementary devices to separate the fusion-evaporation residues from the primary beam and other reaction products. The nuclear-structure-research program at Jyväskylä utilizes these separators and the detector setups shared between the separators to identify weak reaction channels and extract nuclear-structure information via decay experiments and in-beam spectroscopic studies. For example the very weak N∼Z nuclei are studied in-beam by using 𝛽-decay tagging method (Tuike scintillator) enhanced with the mass selection (MARA) and charge particle-evaporation veto (JYTube). peerReviewed
Electron spectroscopy with the SAGE spectrometer
2016
A device called the SAGE (Silicon And GErmanium) spectrometer, designed for in-beam electron spectroscopy, is introduced in this work. A detailed description to the technical aspects of the device is given along with several examples of analytical procedures related to work done with the device. The radial ltering method and veto/add-back algorithms are tools for improving the quality of the electron-gamma data whilst the time-gate selection procedure helps in determining absolute internal conversion coe cients without reference points. Two very di erent types of experiments with results obtained from the electron data are introduced and analysed. Coulomb excitation is used to probe 154Sm a…
Euclid preparation : XVIII. The NISP photometric system
2022
Euclid will be the first space mission to survey most of the extragalactic sky in the 0.95–2.02 µm range, to a 5 σ point-source median depth of 24.4 AB mag. This unique photometric dataset will find wide use beyond Euclid’s core science. In this paper, we present accurate computations of the Euclid YE, JE, and HE passbands used by the Near-Infrared Spectrometer and Photometer (NISP), and the associated photometric system. We pay particular attention to passband variations in the field of view, accounting for, among other factors, spatially variable filter transmission and variations in the angle of incidence on the filter substrate using optical ray tracing. The response curves’ cut-on and …
Estimation of forest stand characteristics using individual tree detection, stochastic geometry and a sequential spatial point process model
2022
Airborne Laser Scanning (ALS) results in point-wise measurements of canopy height, which can further be used for Individual Tree Detection (ITD). However, ITD cannot find all trees because small trees can hide below larger tree crowns. Here we discuss methods where the plot totals and means of tree-level characteristics are estimated in such context. The starting point is a previously presented Horvitz–Thompson-like (HT-like) estimator, where the detectability is based on the larger tree crowns and a tuning parameter that models the detection condition. We propose a new method which is based on modeling the spatial pattern of hidden tree locations using a sequential spatial point process mo…
Validity of long-term and short-term recall of occupational sitting time in Finnish and Chinese office workers
2020
Background As sedentary behavior is a global health issue, there is a need for methods of self-reported sitting assessment. The accuracy and reliability of these methods should also be tested in various populations and different cultural contexts. This study examined the validity of long-term and short-term recall of occupational sitting time in Finnish and Chinese subgroups. Methods Two cohort groups of office-based workers (58.6% female, age range 22–67 years) participated: a Finnish group (FIN, n = 34) and a Chinese group (CHI, n = 36). Long-term (past 3-month sitting) and short-term (daily sitting assessed on 5 consecutive days) single-item measures were used to assess self-reported occ…
Tieto- ja viestintätekniikan hyödyntäminen yläkoulun kemian opetuksessa
2013
Tämän pro gradu –tutkielman tarkoituksena oli kouluttaa Riihimäen kemian opettajia tieto- ja viestintätekniikan (TVT) pedagogisessa käytössä. Koulutus suunniteltiin kyselytutkimuksen vastausten perusteella. Tutkimuksessa haluttiin kartoittaa sitä, miten kemian opettajat hyödyntävät TVT:tä opetuksessaan ja minkälaisia toiveita heillä on räätälöitävälle täydennyskoulutukselle. Täydennyskoulutuksessa opettajat kokeilivat ChemSketch-visualisointiohjelman toimintaa ja he saivat koulutuksesta mukaansa harjoitustyöohjeen. Tuon harjoitustyöohjeen avulla opettajat voivat ottaa kyseisen ohjelman käyttöönsä omassa kemian opetuksessaan. Koulutuksessa opettajat tutustuivat myös mittausautomaatiolaitteen…
Omaelämäkerrallinen ja digitaalinen materiaalisuus lukukäytäntöjen tutkimuksessa
2021
Lukemisen muutos, sähköiset kirjamuodot sekä painetun kirjan asema ja tulevaisuus osana lukemisen tapoja ovat aiheita, jotka herättävät keskustelua. Yksi lukemisen tapoihin vaikuttava seikka, joka jää keskusteluista usein syrjään on kirjoihin liittyvä materiaalisuus. Kirja ja lukulaite ovat esineitä, joihin yhdistetyillä aistikokemuksilla, arvoilla, asenteilla ja mielikuvilla voi olla lukijalle merkitystä. Mitä kirjojen materiaalisuus kenellekin merkitsee, on kuitenkin asia, joka vaihtelee. Keskityn tarkastelemaan artikkelissa erilaisten kokemusten taustoja materiaalisen kulttuurin tutkimuksen, erityisesti siihen liittyvien omaelämäkerrallisen materiaalisuuden ja digitaalisen materiaalisuud…
Arvio : Schleser, Max; Berry Marsha (Ed.by) Mobile Story Making in an Age of Smartphones, Palgrave MacMillan, 2018.
2019
Kirja-arvostelu teoksesta Schleser, Max; Berry Marsha (Ed.by) Mobile Story Making in an Age of Smartphones, Palgrave MacMillan, 2018. nonPeerReviewed
The Development and Precision of a Custom-Made Skitester
2021
In the sport of cross-country skiing, equipment has a direct influence on results. Ski teams do extensive testing of different ski base grinds and products on a yearly basis. To achieve reliable results, the quality of methods used for testing skis needs to be taken in to account in addition to factors including the physical characteristics of testing personnel and changes in weather conditions. The aim of this study was to introduce a custom-made skitester, that was developed for testing skis on real snow, in laboratory conditions, and to evaluate its precision. The current skitester is capable of glide testing both classic and skate skis as well as kick simulation for the testing of grip …