Search results for "röntgensäteily"
showing 10 items of 13 documents
Low-Power, Subthreshold Reference Circuits for the Space Environment : Evaluated with -rays, X-rays, Protons and Heavy Ions
2019
The radiation tolerance of subthreshold reference circuits for space microelectronics is presented. The assessment is supported by measured results of total ionization dose and single event transient radiation-induced effects under &gamma
Compact Cell Imaging Device (CoCID) provides insights into the cellular origins of viral infections
2021
The overall CoCID concept is centred on providing virologists with a next-generation imaging device, which, through increased penetration and depth of focus, as well as through high natural contrast and sensitivity to organelle density (including virus-related organelles), will produce higher-fidelity ultrastructural images of whole intact cells. These insights will, in turn, help increase our understanding of the links between the structural reorganisation of cells and the mechanisms of viral entry, replication, assembly, and egress in cells. CoCID will provide this valuable imaging capability in the form of a compact lab-scale device that will greatly improve the accessibility of soft X-r…
Computer Vision on X-ray Data in Industrial Production and Security Applications: A Comprehensive Survey
2023
X-ray imaging technology has been used for decades in clinical tasks to reveal the internal condition of different organs, and in recent years, it has become more common in other areas such as industry, security, and geography. The recent development of computer vision and machine learning techniques has also made it easier to automatically process X-ray images and several machine learning-based object (anomaly) detection, classification, and segmentation methods have been recently employed in X-ray image analysis. Due to the high potential of deep learning in related image processing applications, it has been used in most of the studies. This survey reviews the recent research on using com…
Intra- vs Intermolecular Aurophilic Contacts in Dinuclear Gold(I) Compounds: Impact on the Population of the Triplet Excited State.
2022
Two series of dinuclear gold(I) complexes that contain two Au–chromophore units (chromophore = dibenzofurane or dimethylfluorene) connected through a diphosphane bridge that differs in the flexibility and length (diphosphane = dppb for 1,4-bis(diphenylphosphino)butane, DPEphos for bis[(2-diphenylphosphino)phenyl]ether, xanthphos for 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene, and BiPheP for 2,2′-bis(diphenylphosphino)-1,1′-biphenyl) have been synthesized and structurally characterized. Their photophysical properties have been carefully investigated, paying attention to the role of the presence, or absence, of aurophilic contacts and their nature (intra- or intermolecular character). Th…
Kehon koostumuksen arvioiminen ihopoimumittauksella, biosähköisellä impedanssilla ja kaksienergisen röntgensäteilyn absorptiometrialla
2010
Ojala, Paula Emilia. Kehon koostumuksen arvioiminen ihopoimumittauksella, biosähköisellä impedanssilla ja kaksienergisen röntgensäteilyn absorptiometrialla. Liikuntafysiologian kandidaatintutkielma. Liikuntabiologian laitos, Jyväskylän yliopisto. Syksy 2010. 56s. Tutkimuksen tarkoituksena oli selvittää ovatko kaksienergisen röntgensäteilyn absorptiometrialla (DXA), biosähköisellä impedanssilla (BIA) ja ihopoimujen paksuusmittauksella (SF) arvioidut kehon rasvaprosentit yhtäläisiä. Vedenalaisesta punnitusmenetelmästä on suurimmaksi osaksi jo luovuttu maailmalla ja DXA on todettu luotettavaksi ja tarkaksi menetelmäksi kehon koostumuksen arvioimisessa. Sen vuoksi BIA:n ja SF:n tuloksia verratt…
Analysis of fluid flow through porous media based on x-ray micro-tomographic reconstructions
2010
This thesis deals with creeping fluid flow through fibrous porous materials. Permeability through a porous medium is a measure of the ability of the material to transmit fluids. For testing and demonstration purposes the permeability values of a few fibrous heterogeneous materials, namely synthetic non-woven felt, wet pressing felt, cardboard, newsprint and hardwood paper, were measured experimentally. Reconstructions of the same materials under similar compression states were captured by x-ray micro-tomography. The actual microscopic pore structure thus obtained was utilised in the numerical lattice-Boltzmann analysis for solving the fluid flow permeability of the materials. Agreement betw…
ECR-ionilähteen tuottaman röntgensäteilyn simulointi
2008
Annoksen määrittäminen mammografiassa digitaalisesta kuvainformaatiosta
2008
Mallipäällysterakenteiden analysoiminen röntgentomografian avulla
2008
Säteilymuodot syöpähoidoissa
2022
Tutkielmassa käydään läpi neljän yleisimmän kiihdytinpohjaisen sädehoitomuodon toimintaa ja historiaa. Sädehoitoja tehdään yleisimmin fotoni-, elektroni- tai protonisäteilyllä. Lisäksi syöpähoitoja tehdään boorineutronikaappaushoitoina. Fotonisäteily on nykypäivänä lähes aina röntgensäteilyä, mutta myös gammasäteilyä on käytetty. Lopuksi pohdin eri hoitomuotojen hyviä ja huonoja puolia sekä eri hoitomuotojen tulevaisuutta.