Search results for "RADIATION"
showing 10 items of 5298 documents
Environmental Organic Photochemistry: Advances and Perspectives
2013
This review is a survey of recent advances in environment related aspects of organic photochemistry. Besides presenting gen- eral concepts, the manuscript is mainly focused on the photoreactivity of natural organic matter, and on the photochemistry of anthropo- genic substances under natural light irradiation.
Numerical procedures and their practical application in PV module analyses. Part III: parameters of atmospheric transparency – determining and correl…
2023
The presented article examines aspects of a PV module testing using natural sunlight in outdoor conditions. The article discusses the physical sense of indexes: atmosphere purity, diffused component content, beam clear sky index. Procedures for their determination are given in relation to both instantaneous and daily values. Their close connection with the values of solar irradiance spectral distribution such as Average Photon Energyand Useful Fractionis demonstrated, as well as their usefulness in moduletesting in outdoor conditions. Their influence on the conversion of modules made from various absorbers and various technologies is demonstrated
Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging
2006
International audience; In the field of industrial vision, the three-dimensional inspection of highly reflective metallic objects is still a delicate task. We deal with a new automated three-dimensional inspection system based on polarization analysis. We first present an extension of the shape-from-polarization method for dielectric surfaces to metallic surfaces. Then, we describe what we believe to be a new way of solving the ambiguity concerning the normal orientation with an active lighting system. Finally, applications to shape-defect detection are discussed, and the efficiency of the system to discriminate defects on specular metallic objects made by stamping and polishing is presente…
Weathering of low-density polyethylene grafted with itaconic acid in laboratory tests
2011
Polyethylene grafted with itaconic acid was subjected to weathering under laboratory accelerated conditions. The course of the photo-oxidative degradation process of that material was studied by FTIR spectroscopy both through quantitative measurements of changes in absorbance values at selected wave numbers and through measurements of surface area values for absorption bands which were separated by means of deconvolution. The use of both those procedures of quantitative determinations resulted in a general conclusion that the oxidation process was initiated from the very first moment of irradiation, and it produced ketones, acids, esters (intramolecular and of acetate type), peracids, peres…
Influence of accelerated ageing conditions on the process of polyolefines degradation
2003
The process of polymers weathering and the methods of polymers weathering and accelerated ageing investigations were characterized. Accelerated ageing tests of polyethylene and polypropylene samples have been done in laboratory conditions. The ageing time (up to 400 h) influence, at various levels of ageing factors: UV radiation intensity (80—190 W/m2), temperature (35—55 °C) and humidity (30—90%), on the changes of the structures of polymers investigated (shares of carbonyl and olefinic groups from FT-IR spectra — Fig. 1, 2, 4 and 5), on the changes of polymers molecular weights (Fig. 3 and 6, Table 1) and on the changes of mechanical properties during tension (Table 1) has been investigat…
Preparation of tungstophosphoric acid/cerium-doped NH2-UiO-66 Z-scheme photocatalyst: a new candidate for green photo-oxidation of dibenzothiophene a…
2021
International audience; The goal of this study was to introduce an effective visible-light induced photocatalytic system with a good ability for photocatalytic oxidative desulfurization (PODS) and denitrogenation (PODN) using molecular oxygen (O2) as an oxidant. In this regard, tungestophosphoric acid (PW12) was supported onto cerium-doped NH2-UiO-66 (PW12/Ce-NUiO-66) and employed for the photo-oxidation of dibenzothiophene (DBT) and quinoline (Qu). Herein, using cerium (Ce) as a “mediator” facilitated the separation of charge carriers, while NH2-UiO-66 remarkably enhanced the surface area with plentiful adsorption sites and shifted the adsorption edge of PW12to the visible region. The sum …
ANTINFLAMMATORY EFFECT OF LEVORAG (THD) EMULGEL ON RADIATION PROCTOCOLITIS AROUND A COLO-ANAL ANASTOMOSIS: AN INNOVATIVE CASE REPORT
2020
Post-radiation proctitis (PRP) is one of most common complications after abdominal and pelvic radiotherapy for different malignancies. Chronic radiation proctitis (CRP) usually develops 90 days or more after radiation. The present study aimed to show the employment of Levorag Emulgel® (THD S.p.A Correggio, Reggio-Emilia, Italy) as off-label topical treatment, by instillation, to resolve the acute phase of PRP around a coloanal anastomosis, in a patient undergone surgery for an adenocarcinoma of the low rectum, then treated with the Gatekeeper® methodic to resolve fecal incontinence as consequence of the first surgical rectal resection. In conclusion, we can affirm that our methodic could re…
Heavy-Ion-Induced Degradation in SiC Schottky Diodes : Incident Angle and Energy Deposition Dependence
2017
Heavy-ion-induced degradation in the reverse leakage current of SiC Schottky power diodes exhibits a strong dependence on the ion angle of incidence. This effect is studied experimentally for several different bias voltages applied during heavy-ion exposure. In addition, TCAD simulations are used to give insight on the physical mechanisms involved. peerReviewed
Absorption of European Funds by Romania During 2014-2020
2021
Abstract The time span between 2014 and 2020 constitutes a new, multi-annual financial framework. During this time, by negotiating with the European Union, Romania received financing through 5 major types of funds which were part of the European Structural Investments Funds (ESIF) and which were structured in six major Operational Programs, the most consistent of which is POIM - The Major Infrastructure Operational Program (MIOP). Within this financial framework, Romania needs to improve its absorption of funds based on the experience gained in the previous framework, with regards to issues like bureaucracy, corruption, lack of qualified personnel for the implementation of projects, the tra…
Investigation of the Efficiency of Shielding Gamma and Electron Radiation Using Glasses Based on TeO2-WO3-Bi2O3-MoO3-SiO to Protect Electronic Circui…
2022
This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (No. AP09058081). EP, EE, and AIP thank the Institute of Solid State Physics, University for their support. ISSP UL as the Center of Excellence is supported through the Framework Program for European universities Union Horizon 2020, H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under Grant Agreement No. 739508, CAMART2 project.