Search results for " Reliability."
showing 10 items of 551 documents
Impact of Electrical Stress and Neutron Irradiation on Reliability of Silicon Carbide Power MOSFET
2020
International audience; The combined effects of electrical stress and neutron irradiation of the last generation of commercial discrete silicon carbide power MOSFETs are studied. The single-event burnout (SEB) sensitivity during neutron irradiation is analyzed for unstressed and electrically stressed devices. For surviving devices, a comprehensive study of the breakdown voltage degradation is performed by coupling the electrical stress and irradiation effects. In addition, mutual influences between electrical stress and radiative constraints are investigated through TCAD modeling.
Applicability of the dielectric barrier discharge for helium ash measurements in the divertor region
2016
Abstract Controlled fusion based on the magnetic confinement of the plasma is one of the main aims of the Euro-fusion programme. In the fusion device, the hydrogen isotopes, in nuclear reactions, will produce helium nuclei. The products, as the ash, will be removed from the plasma in the region of the so-called divertor. Controlling the helium to hydrogen ratio in this ‘exhaust gas’ will provide information about the efficiency of the fusion process as well as of the efficiency of the helium removal system. One of the methods to perform this task is to study the properties of the discharge conducted in such exhaust gas. In this paper, the applicability of the dielectric barrier discharge (D…
The dynamics of the surface layer of lipid membranes doped by vanadium complex: computer modeling and EPR studies
2015
Abstract Penetration of the liposome membranes doped with vanadium complex formed in the liquid-crystalline phase from egg yolk lecithin (EYL) by the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) spin probes has been investigated. The penetration process was followed by 360 hours at 24°C, using the electron spin resonance (EPR) method. The spectroscopic parameter of the partition (F) of this probe indicated that a maximum rigidity of the membrane was at 3% concentration of the vanadium complex. Computer simulations showed that the increase in the rigidity of the membrane corresponds to the closure of gaps in the surface layer of the membrane, and indicates the essential role of the membrane …
Second order reflection from crystals used in soft X-ray spectroscopy
2015
Abstract In this note the ratio of the second to the first order reflection is determined for the KAP and PbSt crystals, for wavelengths corresponding to the Al K-line emission. The source of the radiation was a low-voltage stabilized X-ray tube. The X-rays were detected with a Bragg spectrometer equipped with a proportional counter detector. The signal measured by the proportional counter was subsequently pulse height analyzed.
The utmost ends of the nuclear fuel cycle: Finnish perceptions of the risks of uranium mining and nuclear waste management
2013
There has been substantial social scientific research to determine how people perceive the risks of nuclear power, wastes, and waste management, but not much attention has been given to risk perceptions of other types of nuclear activities. Knowledge about attitudes towards uranium mining and exploitation is increasing, and more attention should be paid to how people perceive the risks of both ends of the nuclear fuel cycle. Therefore, the aim of this paper is to analyze the risk perceptions towards nuclear waste and uranium mining and how these perceptions relate to each other. The analysis is based on Finnish survey data (N = 1180) gathered in 2007. Renewed international interest in nucle…
Re-Clustering tool using an Open-Reference method that improves OTU definition
2019
International audience; 1.Environmental microbial communities are now widely studied using metabarcoding approaches, thanks to the democratization of high‐throughput DNA sequencing technologies. The massive number of reads produced with these technologies requires bioinformatic solutions to be treated. A key step in the analysis is to cluster reads into Operational Taxonomic Units (or OTUs) and thus reduce the amount of data for downstream analyses. Due to the important impact of the clustering method on the quantity and quality of OTUs, finding an equilibrium between the reliability and time‐consuming nature of the chosen strategy is a real challenge. The present article proposes a new pos…
Effects of Interrater Reliability of Psychopathologic Assessment on Power and Sample Size Calculations in Clinical Trials
2002
Although rater training is increasingly used to improve the quality of the investigated outcome parameters, the reliability of assessments is not perfect. Thus, empirical reliability estimates should be used instead of theoretically assumed perfect reliability. Implications of the reliability of psychiatric assessments for sample size and power calculations in clinical trials are presented. The theoretical basis of sample size and power calculations using empirical reliability scores is delineated. Examples from contemporary research on schizophrenia and depression are used to illustrate several implications for study design and interpretation of results. The tremendous impact of the lack o…
Menancapkan Tiang-Tiang “Kayu Besi”: Adat dan Strategi Para Elit di Kabupaten Teluk Bintuni, Papua Barat
2019
Memperkuat adat bisa bermata dua jika hanya terfokus pada romantisasi “ideologi harmoni†tanpa memeriksa relasi produksi dan kelas dalam masyarakat adat kontemporer. Merespon kebijakan-kebijakan yang dilakukan oleh negara dan investasi, gerakan masyarakat adat di Tanah Papua harus mampu merefleksikan diri dalam hubungan dengan perubahan di internal diri mereka merespon perubahan yang diangkut oleh pembangunan dan investasi. Hanya dengan memahami konteks inilah masyarakat adat di Papua akan mampu untuk mengambil langkah-langkah aksi dalam menegakkan martabatnya.
Pemertahanan Bahasa Ibu tentang Tempat-Tempat Sakral dan Tantangan Perubahan Sosial Budaya Orang Marori dan Kanum di Kabupaten Merauke, Papua
2018
Artikel ini memfokuskan pada upaya bersama-sama yang dilakukan penulis dengan generasi muda di dua suku yaitu Marori dan Kanum di Kabupaten Merauke, Papua untuk melakukan dokumentasi bahasa dan nilai-nilai budaya mengenai hubungan mereka dengan lingkungannya. Kondisi perubahan sosial budaya menghimpit mereka dan pondasi pengetahuan lokal dalam pemanfaatan lingkunga menjadi tergoyahkan. Masyarakat lokal memiliki pengetahuan kaya yang menunjukkan relasi panjang dengan lingkungan alam sekitarnya. Dari perspektif masyarakat terdapat pemetaan ruang-ruang hidup yang mencakup wilayah perkampungan, perkebunan, dan leluhur (pamali). Masyarakat juga menamai wilayah-wilayah tersebut dengan bahasa loka…
Las interacciones C.T.S. en la enseñanza de las ciencias. Análisis comparativo de la situación para la Física y Química y la Biología y Geología
1995
En trabajos recientes de investigacion en didactica de las ciencias se insiste en la necesidad de introducir las relaciones Ciencia, Tecnologia y Sociedad (CTS) en la ensenanza de las ciencias. En este articulo se constata que en nuestro pais dichas relaciones estan practicamente ausentes en los libros de texto cientificos. Esto contribuye a que los estudiantes tengan una imagen de la ciencia alejada del mundo real, poco relacionada con el desarrollo tecnologico y sus consecuencias en el medio ambiente y la sociedad. Por otra parte, se observan diferencias en el interes de los estudiantes hacia la Fisica y Quimica y la Biologia y Geologia.