The Low Energy Ion Ring (LEIR) at CERN is the first synchrotron in the Large Hadron Collider ions injector chain. The performance of LEIR is mainly determined by the number of charges extracted from ...the machine and transferred to the downstream chain of accelerators. Ions are delivered by the linear accelerator Linac 3. In the intensity accumulation phase, the machine operates with coasting beams: each injected beam is cooled, reducing its transverse dimensions and momentum spread, and brought into a stacking momentum position to allow subsequent injections. In this context, the evolution of the beam parameters for an injected beam under the effects of electron cooling, impedance, intrabeam scattering (IBS), and space charge is of interest in order to optimize the machine working point with respect to the accumulated intensity and to contribute to the understanding of the interplay of the different collective effects. This work describes the advancement in modeling coasting beam dynamics for LEIR accounting for the interplay of electron cooling, impedance, IBS, and space charge. Each effect is presented and progressively included to compute the simulated equilibrium longitudinal Schottky spectrum, which is found in good agreement with the measured one.
The equilibrium emittance of the Pb beam in the CERN Low Energy Ion Ring (LEIR) results from the interplay of electron cooling and heating processes, as intra-beam scattering and space charge. In ...this paper we present the measurements of the emittance evolution as a function of intensity, working point and resonance excitation, and compare them with the simulations of the heating processes. Optimum settings for normal and skew sextupoles have been found for the compensation of resonances excited by the lattice.
Future ultralow emittance rings for e − / e + colliders require extremely high beam brightness and can thus be limited by collective effects. In this paper, the interplay of effects such as ...synchrotron radiation, intrabeam scattering (IBS), and space charge in the vicinity of excited betatron resonances is assessed. In this respect, two algorithms were developed to simulate IBS and synchrotron radiation effects and integrated in the y tracking code, to be combined with its widely used space charge module. The impact of these effects on the achievable beam parameters of the Compact Linear Collider (CLIC) damping rings was studied, showing that synchrotron radiation damping mitigates the adverse effects of IBS and space charge induced resonance crossing. The studies include also a full dynamic simulation of the CLIC damping ring cycle starting from the injection beam parameters. It is demonstrated that a careful working point choice is necessary, in order to accommodate the transition from detuning induced by lattice nonlinearities to space-charge dominated detuning and thereby avoid excessive losses and emittance growth generated in the vicinity of strong resonances. Published by the American Physical Society 2024
Emotional Intelligence as a Personality State Zampetakis, Leonidas A.; Mitropoulou, Eirini M.
European journal of psychological assessment : official organ of the European Association of Psychological Assessment,
2024, Letnik:
40, Številka:
1
Journal Article
Recenzirano
Contemporary research has begun to explore the notion
that emotional intelligence (EI) has an important state component in addition to
the trait component, as represented in the whole trait theory. ...This implies that
state EI (or enacted EI) has similar cognitive, affective, and motivational
contents as its corresponding trait. The question, however, of whether a trait
EI construct means the same across the individual (trait) and state levels of
analysis has not been empirically investigated. To address this gap, the present
study examines the assessment of enacted EI, using the full version of the Wong
and Law Emotional Intelligence Scale (WLEIS) on both between-person and
within-person levels of analysis. Participants were 493 Greek employees who
completed the WLEIS for 5 consecutive workdays. Multilevel confirmatory factor
analyses confirmed that the original four-factor multilevel model appeared to
best fit the data. Multilevel measurement invariance analysis supported the
equivalence of the measure across different levels of analysis. In conclusion,
the WLEIS is a configural cluster construct, believed to be a valuable and
reliable tool for assessing enacted EI within the workplace. Implications for
future research on enacted EI are discussed.
Unfolding item response theory (IRT) models are important alternatives to dominance IRT models in describing the response processes on self-report tests. Their usage is common in personality ...measures, since they indicate potential differentiations in test score interpretation. This paper aims to gain a better insight into the structure of trait personality, by investigating whether the dominance or alternatively the unfolding IRT model are better descriptors of the response processes on a personality measure constructed under the dominance response theorem. For the assessment of the dominant model, the Graded Response Model (GRM) is used; while for the unfolding model, the Generalized Graded Unfolding Model (GGUM) was examined. All analyses are conducted with the freely available R. A sample of 1340 Greek adults, employed in private and public organizations, fulfilled the Trait Personality Questionnaire 5 short-form (TPQue5). Findings contradict previous research on trait personality. In accordance to the construction method employed, the TPQue5 items are best understood by monotonically increasing item response functions (IRFs). Individuals responding to the TPQue5 increase their probability of endorsing its items as their trait level increases; this stands for all personality dimensions, although Openness to Experience exhibited mixed type of item response patterns. Further research directions, implications and limitations are also discussed.
In this study, stabilization/solidification of electric arc furnace dust and Pb-refining dust was investigated. Stabilization of both wastes was performed by mixing each raw waste with MgO, Portland ...cement, MgO with MgCl
2
(magnesium oxychloride cement), and MgO with phosphate salts (magnesium phosphate cement), at ratios between 5 and 25 wt%. Stabilization/solidification processes were evaluated using EN 12457-4 standard leaching test and stabilized wastes were classified according to the 2003/33/EC Decision. Leachates of stabilized electric arc furnace dust with magnesium oxychloride and magnesium phosphate cement at 10 wt% and 5 wt%, respectively, presented lower concentrations than the regulation limits for disposal in non-hazardous waste landfills; however, the stabilized electric arc furnace dust using MgO or Portland cement at 25 wt% cannot be disposed in hazardous waste landfills. Stabilized Pb-refining dust using MgO or Portland cement at 25 wt% can be disposed of in hazardous waste landfills, whereas stabilized Pb-refining dust with magnesium oxychloride and magnesium phosphate cement at 20 wt% is suitable for disposal in non-hazardous waste landfills. The efficiency of magnesia cements stabilization is attributed to regulation of pH at 10–11, where metal solubility is diminished and positive surface charge of hydrolyzed MgO products results in high adsorption of metalloids oxy-anions.
The aim of this study was to examine the effect of chemical cationization on the structure and function of antifreeze protein III (AFP III) over an extreme temperature range (−40°C to +90°C) using ...far-UV synchrotron radiation circular dichroism (SRCD) and ice recrystallization inhibition (IRI) assays. Chemical cationization was able to produce a modified AFP III with a net cationic charge at physiological pH that had enhanced resistance to denaturation at elevated temperatures, with no immediate negative impact on protein structure at subzero temperatures. Furthermore, cationized AFP III retained an IRI activity similar to that of native AFP III. Consequently, chemical cationization may provide a pathway to the development of more robust antifreeze proteins as supplementary cryoprotectants in the cryopreservation of clinically relevant cells.
•Chemical cationization improves thermal stability of antifreeze protein III.•Cationic antifreeze protein III retains ice recrystallization inhibition activity.•Synchrotron radiation circular dichroism investigation of antifreeze protein III.
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