Search results for "Lead"

2015

Abstract. This paper presents results from the "INUIT-JFJ/CLACE 2013" field campaign at the high alpine research station Jungfraujoch in January/February 2013. The chemical composition of ice particle residuals (IPR) in a size diameter range of 200–900 nm was measured in orographic, convective and non-convective clouds with a single particle mass spectrometer (ALABAMA) under ambient conditions characterized by temperatures between −28 and −4 °C and wind speed from 0.1 to 21 km h−1. Additionally, background aerosol particles in cloud free air were investigated. The IPR were sampled from mixed-phase clouds with two inlets which selectively extract small ice crystals in-cloud, namely the Count…

68 Ga‐Labelled Tropane Analogues for the Visualization of the Dopaminergic System

2020

Abstract The development of radiometal‐labelled pharmaceuticals for neuroimaging could offer great potential due to easier handling during labelling and availability through radionuclide generator systems. Nonetheless, to date, no such tracers are available for positron emission tomography, primarily owing to the challenge of crossing the blood–brain barrier (BBB) and loss of affinity through chelator attachment. We have prepared a variety of 68Ga‐labelled phenyltropanes showing that, through a simple hydrocarbon‐linker, it is possible to introduce a chelator onto the lead structure while maintaining its high affinity for hDAT (human dopamine transporter) and simultaneously achieving adequa…

Socio-Demographic Factors Involved in a Low-Incidence Phase of SARS-CoV-2 Spread in Sicily, Italy

2021

Background: The present study analysed SARS-CoV-2 cases observed in Sicily and investigated social determinants that could have an impact on the virus spread. Methods: SARS-CoV-2 cases observed among Sicilian residents between the 1 February 2020 and 15 October 2020 have been included in the analyses. Age, sex, date of infection detection, residency, clinical outcomes, and exposure route have been evaluated. Each case has been linked to the census section of residency and its socio-demographic data. Results: A total of 10,114 patients (202.3 cases per 100,000 residents

¿Cómo se define el liderazgo en la defensa europea? Un análisis fsQCA

2017

The paper addresses the issue of national leadership in the politics of European defence, in order to determine the relative value of different factors in the exercise of leadership, and the reasons why some countries are more willing than others to contribute to the development of the EU’s Common Security and Defence Policy. The article starts by discussing the main contributions of the (neo)realist and constructivist approaches to European leadership on defence. It then highlights the process of development of EU defence policy and its setbacks. Leadership factors that characterize this development process are identified and employed to construct a fsQCA analysis, which assesses the leade…

Efficient vacuum deposited p-i-n and n-i-p perovskite solar cells employing doped charge transport layers

2016

Methylammonium lead halide perovskites have emerged as high performance photovoltaic materials. Most of these solar cells are prepared via solution-processing and record efficiencies (>20%) have been obtained employing perovskites with mixed halides and organic cations on (mesoscopic) metal oxides. Here, we demonstrate fully vacuum deposited planar perovskite solar cells by depositing methylammonium lead iodide in between intrinsic and doped organic charge transport molecules. Two configurations, one inverted with respect to the other, p-i-n and n-i-p, are prepared and optimized leading to planar solar cells without hysteresis and very high efficiencies, 16.5% and 20%, respectively. It is t…

Lead acetate precursor based p-i-n perovskite solar cells with enhanced reproducibility and low hysteresis

2015

A low temperature approach for the fabrication of p-i-n perovskite solar cells is presented. Using lead acetate-based precursors, flat and homogeneous CH3NH3PbI3 films, compatible with the use of thin organic charge transport layers, can be obtained. The corresponding solar cells showed power conversion efficiency up to 12.5%, with remarkable reproducibility and very low hysteresis.

Optimistic thinking, satisfaction with life and job and nursing care rationing: Multicentre study in Poland

2020

Aims: The aim was to examine whether the level of optimism and job and life satisfaction is a differentiating factor from the level of implicit rationing of nursing care in a sample of Polish registered nurses. Background: Satisfaction with life and job is reflected by greater effectiveness of nurses at work and creates a positive work environment, which in turn may modulate the level of implicit rationing of nursing care. Methods: A cross-sectional multicentre research design was adopted, employing a representative sample of 1,010 registered Polish nurses identified between the beginning of January and the end of June 2019. Four self-report scales were used in this study: Basel Extent of R…

Shanghai Teachers’ Perceptions of Distributed Leadership: Resources and Agency

2021

Purpose:Drawing on distributed leadership and motivation theories, this study investigates teachers’ perceptions of resource and agency distributions and identifies the key factors motivating leadership among teachers.Design/Approach/Methods:This quantitative study collected data from 327 teachers in nine schools in Shanghai. Chi-square tests of independence were conducted to examine the associations between leadership structures and power distance, while Spearman’s correlation tests were used to identify changes in leadership resource impact. A nonparametric Friedman’s test was applied to detect discrepancies between the agency of principals, team leaders, and teachers. Finally, Chi-square…

The Key Role of Human Resource Practices for the Promotion of Creativity and Innovation: A Spanish Case Study

2013

Management literature suggests that employee creativity can contribute substantially to organisational innovation, effectiveness and survival. In addition, the ability to innovate has also emerged as a basic strategic option. Innovation models express the need to implement specific human resource practices (HRP) for the development of skills, knowledge and innovation-oriented behaviours. Human resource practices can be extremely important when organisations intend to foster creativity and innovation which are key factors in competing effectively. With this aim in mind, we suggest that the existence of certain HRP such as training, performance appraisal and reward systems have a positive eff…

Avoiding Demand Amplification Phenomenon via Hi-tech Application: A What-If Supply Chain Analysis

2010

The well-known deleterious effect of the amplification of variance of order rates in multi-echelon systems, commonly known as demand amplification phenomenon or bullwhip effect, still presents new challenges and continues to fascinate the operations management community. Recently this research field is focusing on the study of robustness of bullwhip avoidance techniques under uncertainty, as environmental conditions often determine variations in processes, with regards to production and delivery lead time, and variations in the parameters of the decision policies. This work aims at quantifying the efficacy of bullwhip dampening techniques and at verifying this efficacy against variations in…