2,640 research outputs found
Czynniki ryzyka i czynniki chroniące związane z zachowaniami problemowymi – przegląd badań przeprowadzonych w Polsce
Publikacja wydana w ramach projektu „Terapia przez rozwój”. Program rozwoju sieci placówek dla młodzieży zagrożonej przedwczesnym wypadnięciem z systemu oświaty. Projekt współfinansowany ze środków Unii Europejskiej w ramach Europejskiego Funduszu Społeczneg
ELECTRONIC STRUCTURE OF GE IN SIO2
It is argued that one-electron theory is insufficient to account for the origin of the observed spectra of Ge in SiO2 ( alpha -quartz) crystals. A simple model is employed to show that impurity states responsible for ESR spectra of SiO2:Ge are stabilised by many-electron polarisation effects associated with the Ge atom itself and its immediate oxygen neighbour
Full modelling of high-intensity focused ultrasound and thermal heating in the kidney using realistic patient models
Objective: High-intensity focused ultrasound (HIFU) therapy can be used for
non-invasive treatment of kidney (renal) cancer, but the clinical outcomes have
been variable. In this study, the efficacy of renal HIFU therapy was studied
using nonlinear acoustic and thermal simulations in three patients. Methods:
The acoustic simulations were conducted with and without refraction in order to
investigate its effect on the shape, size and pressure distribution at the
focus. The values for the attenuation, sound speed, perfusion and thermal
conductivity of the kidney were varied over the reported ranges to determine
the effect of variability on heating. Furthermore, the phase aberration was
studied in order to quantify the underlying phase shifts using a second order
polynomial function. Results: The ultrasound field intensity was found to drop
on average 11.1 dB with refraction and 6.4 dB without refraction. Reflection at
tissue interfaces was found to result in a loss less than 0.1 dB. Focal point
splitting due to refraction significantly reduced the heating efficacy.
Perfusion did not have a large effect on heating during short sonication
durations. Small changes in temperature were seen with varying attenuation and
thermal conductivity, but no visible changes were present with sound speed
variations. The aberration study revealed an underlying trend in the spatial
distribution of the phase shifts. Conclusion: The results show that the
efficacy of HIFU therapy in the kidney could be improved with aberration
correction. Significance: A method is proposed by which patient specific
pre-treatment calculations could be used to overcome the aberration and
therefore make ultrasound treatment possible.Comment: Journal paper, IEEE Transactions on Biomedical Engineering (2018
Experimental Approaches at Linear Colliders
This report summarises the activity of the E3 working group "Experimental
Approaches at Linear Colliders". The group was charged with examining
critically the physics case for a linear collider of energy of order 1 TeV as
well as the cases for higher energy machines, assessing the performance
requirements and exploring the viability of several special options. In
addition it was asked to identify the critical areas where R&D is required.Comment: 21 pages, 13 figures, to appear in the Proceedings of the APS / DPF /
DPB Summer Study on the Future of Particle Physics (Snowmass 2001), Snowmass,
Colorado, 30 Jun - 21 Jul 200
Sustainable consumption: measurement problems
Celem pracy jest przedstawienie problematyki pomiaru zrównoważonej konsumpcji na podstawie najnowszych badań w dziedzinie pomiaru zrównoważonego rozwoju. Jednym z celów europejskiej polityki ochrony środowiska jest zrównoważona produkcja i konsumpcja (SCP –Sustainable Consumption and Production). Sustainable Consumption and Production zajmuje ważne miejsce w tzw. zielonej gospodarce (green economy), czyli takim rozwoju społeczno-gospodarczym, który w bardziej efektywny sposób realizuje cele zrównoważonego rozwoju. W pracy poddano analizie dostępną literaturę na temat mierników zrównoważonej konsumpcji zarówno polsko-, jak i angielskojęzyczną. W celu omówienia pomiaru postępu na drodze zrównoważonej konsumpcji wykorzystano m.in. raporty Europejskiej Agencji Środowiska (EEA – European Environment Agency), dane Eurostatu oraz prace Głównego Urzędu Statystycznego.The aim of the study is to present the issue of measuring sustainable consumption in the light of the latest research into sustainable development. Sustainable consumption and production (SCP) is one of the objectives of EU environmental policy. SCP occupies animportant place in the so-called green economy, i.e. socio-economic development that meets the objectives of sustainability more effectively. This paper examines the available literature, in both Polish and English, on measurement of sustainable consumption. In order to assess the progress towards reaching sustainable consumption, the author uses, inter alia, the reports of the European Environment Agency (EEA), Eurostat reports and the research outcomes obtained by the Polish Central Statistical [email protected] Barbara Jaros – Instytut Ekologii Terenów Uprzemysłowionych w Katowicac
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