Search results for "SED"
showing 10 items of 21612 documents
Understanding tungsten erosion during inter/intra-ELM periods in He-dominated JET-ILW plasmas
2021
Tungsten erosion was quantified during inter/intra-ELM periods in He-dominated JET-ILW plasmas by optical emission spectroscopy. The intra-ELM tungsten sputtering in helium plasmas, which dominates the total W source, prevails by a factor of about 4 over inter-ELM sputtering in the investigated ELM frequency range from 90 Hz-120 Hz. He ions are mainly responsible for the W erosion during the ELMs in He plasmas. The strong in/out asymmetry of the ELM-induced W erosion is observed in He plasmas even at high ELM frequencies beyond 100 Hz. In Ohmic/L-mode plasmas and during the H-mode inter-ELM plasma phases both He2+ and Be2+ ionic species are major contributors to the W erosion. Their contrib…
Erosion, screening, and migration of tungsten in the JET divertor
2019
The erosion of tungsten (W), induced by the bombardment of plasma and impurity particles, determines the lifetime of plasma-facing components as well as impacting on plasma performance by the influx of W into the confined region. The screening of W by the divertor and the transport of W in the plasma determines largely the W content in the plasma core, but the W source strength itself has a vital impact on this process. The JET tokamak experiment provides access to a large set of W erosion-determining parameters and permits a detailed description of the W source in the divertor closest to the ITER one: (i) effective sputtering yields and fluxes as function of impact energy of intrinsic (Be,…
Unsupervised network intrusion detection systems for zero-day fast-spreading network attacks and botnets
2015
Today, the occurrence of zero-day and complex attacks in high-speed networks is increasingly common due to the high number vulnerabilities in the cyber world. As a result, intrusions become more sophisticated and fast to detrimental the networks and hosts. Due to these reasons real-time monitoring, processing and intrusion detection are now among the key features of NIDS. Traditional types of intrusion detection systems such as signature base IDS are not able detect intrusions with new and complex strategies. Now days, automatic traffic analysis and anomaly intrusion detection became more efficient in field of network security however they suffer from high number of false alarms. Among all …
Revista española de orientación y psicopedagogía
2014
RESUMENEste artículo responde a la necesidad de reflexionar acerca de las tutorías universitarias para alumnos de primero y sobre cómo llevar a cabo, de la manera más eficaz y efectiva posible, el Plan de Acción Tutorial (PAT). Esta reflexión se realiza a partir de las consideraciones, aportaciones y experiencias personales que algunos profesores/tutores han manifestado a lo largo de distintas sesiones de trabajo respecto a la implementación del PAT en la Universitat de València. Todo ello, con el objetivo de mejorar e innovar en el contexto universitario basándonos en experiencias reales.ABSTRACTThis article responds to the need of reflecting about university tutoring for first year studen…
Effect of the extensional flow on the properties of oriented nanocomposite films for twist wrapping
2011
In this study, we examined the mechanical behavior of nanocomposite films based on polyethylene (PE) and pristine PE films. The films were prepared by film blowing and were then cold-drawn at low temperature. The experimental results show that cold drawing significantly enhanced the orientation; with increasing draw ratio (DR), the elastic modulus and tensile strength of the PE films strongly increased, particularly in the presence of the organoclay. To obtain polymeric films suitable for twist wrapping, the films must be sufficiently stiff so that no shrinkage or elastic recovery occur during or after twisting. The elongation at break and the yield strain sharply decreased with orientation…
Strictly correlated electrons approach to excitation energies of dissociating molecules
2019
In this work we consider a numerically solvable model of a two-electron diatomic molecule to study a recently proposed approximation based on the density functional theory of so-called strictly correlated electrons (SCE). We map out the full two-particle wave function for a wide range of bond distances and interaction strengths and obtain analytic results for the two-particle states and eigenenergies in various limits of strong and weak interactions, and in the limit of large bond distance. We then study the so-called Hartree-exchange-correlation (Hxc) kernel of time-dependent density functional theory which is a key ingredient in calculating excitation energies. We study an approximation b…
Childhood physical activity as a labor market investment
2021
This study examined the role of physical activity and changes in physical activity levels during childhood in long‐term labor market outcomes. To address this important but under‐researched theme, the study utilized data drawn from longitudinal research, the Cardiovascular Risk in Young Finns Study (YFS), and from registries compiled by Statistics Finland. The study consisted of children aged 9 (n=1565) and 15 (n=2445) at the time their physical activity was measured. Labor market outcomes, including employment status, average employment months, and average unemployment months, were calculated from 1997 to 2010, when the participants were aged 20 to 48 years. Regression models were used to …
Essays on regional development and labor mobility in a knowledge-based economy
2011
Ramowanie bezpieczeństwa w debatach telewizyjnych w kampaniach wyborczych: samorządowej (2014) i parlamentarnej (2015)
2018
Celem badań przedstawionych w niniejszym artykule było zdiagnozowanie miejsca oraz ram interpretacyjnych (framingu) zagadnień związanych z bezpieczeństwem w debatach przedwyborczych. Analizie poddane zostały debaty telewizyjne, które odbyły się w miastach wojewódzkich przed wyborami samorządowymi z 2014 r. oraz parlamentarnymi z 2015 r. Prezentowane badania pokazują zasadnicze zróżnicowanie, zarówno jeśli chodzi o obecność kwestii bezpieczeństwa w debacie na poziomie krajowym ^lokalnym, jak i narracji stosowanej w odniesieniu do poszczególnych typów bezpieczeństwa.