Search results for "55"
showing 10 items of 2320 documents
Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon
2021
In this study, the variability of the spectral dispersion of droplet size distributions (DSDs) in convective clouds is investigated. Analyses are based on aircraft measurements of growing cumuli near the Amazon basin, and on numerical simulations of an idealized ice‐free cumulus. In cleaner clouds, the relative dispersion ϵ, defined as the ratio of the standard deviation to the mean value of the droplet diameter, is negatively correlated with the ratio of the cloud water content (qc) to the adiabatic liquid water content (qa), while no strong correlation between ϵ and qc/qa is seen in polluted clouds. Bin microphysics numerical simulations suggest that these contrasting behaviors are associ…
Impact of Convectively Detrained Ice Crystals on the Humidity of the Tropical Tropopause Layer in Boreal Winter
2020
Deep convection detraining in the uppermost tropical troposphere is capable of transporting water vapor and ice into the tropical tropopause layer (TTL), but the impact of deep convection on the global and regional TTL water vapor budget remains uncertain. In particular, the role of convectively detrained ice crystals that remain suspended after active convection has subsided is not well understood. These ice crystals represent aging cirrus anvils detached from the convective core. We use a cloud microphysical model that tracks individual ice crystals throughout their lifetimes to quantify the impact of detrained ice on the humidity of the TTL during boreal winter. Convective influence of a…
Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin
2018
Airborne observations over the Amazon Basin showed high aerosol particle concentrations in the upper troposphere (UT) between 8 and 15 km altitude, with number densities (normalized to standard temperature and pressure) often exceeding those in the planetary boundary layer (PBL) by 1 or 2 orders of magnitude. The measurements were made during the German–Brazilian cooperative aircraft campaign ACRIDICON–CHUVA, where ACRIDICON stands for Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud Systems and CHUVA is the acronym for Cloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving Modeling and to the GPM …
Detection of reactive nitrogen containing particles in the tropopause region? Evidence for a tropical nitric acid trihydrage (NAT) belt
2008
The detection of nitric acid trihydrate (NAT, HNO<sub>3</sub>&times;3H<sub>2</sub>O) particles in the tropical transition layer (TTL) harmonizes our understanding of polar stratospheric cloud formation. Large reactive nitrogen (NO<sub>y</sub>) containing particles were observed on 8 August 2006 by instruments onboard the high altitude research aircraft M55-Geophysica near and below the tropical tropopause. The particles, most likely NAT, have diameters less than 6 &mu;m and concentrations below 10<sup>-4</sup> cm<sup>&minus;3</sup>. The NAT particle layer was repeatedly detected at altitudes between 15.1 and 17.5 km ove…
The influence of absorbed solar radiation by Saharan dust on hurricane genesis
2015
To date, the radiative impact of dust and the Sahar an air layer (SAL) on North Atlantic hurricane activity is not yet known. According to previous studies, dust stabilizes the atmosphere due to absorption of solar radiation but thus shifts convection to regions more conducive for hurricane genesis. Here we analyze differences in hurricane genesis and frequency from ensemble sensitivity simulations with radiatively active and inactive dust in the aerosol-climate model ECHAM6-HAM. We investigate dust burden and other hurricane-related variables and determine their influence on disturbances which develop into hurricanes (developing disturbances, DDs) and those which do not (nondeveloping dist…
Gozos del glorioso Santo Tomas de Villanueva, Arzobispo de Valencia, venerado en el Real Convento de N. S ̇del Socorro, extramuros de Valencia, donde…
1750
El full orlat Grav. xil. enmarcat de "S. Tomàs de Villanueva", flanquejat per gerros amb flors El text del goig a tres col. separades per filets
The Last Planner System Style of Planning: Its Basis in Learning Theory
2012
The objective of this article is to contribute to creating a better understanding of the Last Planner System (LPS) - which is associated with Lean Construction - in the light of the learning processes at the basis of knowledge development, and of change and innovation. Founded on a theoretical discussion, three research questions are asked, namely: In what ways can the LPS be expected to alter the learning arenas compared to conventional project management in construction; according to learning theory, what are the main challenges associated with implementing the LPS; and, finally, what kind of learning can be linked to an implemented LPS that functions as intended? The implementation of th…
E-learning in corporate training using interactive courses
2017
Master's thesis Multimedia and Educational Technology MM500 - University of Agder 2017 Health, safety, and environment (HSE) is an important term in industrial- and corporate context. A company focusing on their employees sharing the same values and attitudes regarding HSE can experience a working environment where employees feels safe, and perform their work without unnecessary risk-taking. There are often seen examples where HSE training relies on traditional classroom teaching, and keeps the focus on “do’s and “don’ts”, but the key to get employees to share a common goal on HSE, is to provide a deeper meaning for each employee on what this term actually mean. The purpose of this research…
El principio de buena administración y la gobernanza en la contratación pública
2020
Las exigencias de la sociedad sobre la administración pública pasan por profundizar en el comportamiento y en la dedicación profesional, sobre todo, de los administradores y gestores públicos. Todo ello no es más que trasunto del principio de buena administración que, como ya he destacado, es hoy un derecho de los ciudadanos, que reclama mayor objetividad en la toma de decisiones, mayor intensidad en la defensa de los derechos de los ciudadanos, más transparencia, más control y, sobre todo una más proactiva rendición de cuentas. Se trata, en definitiva, de imbuir a los gestores públicos y a los ciudadanos que más frecuente y estrechamente se relacionan con ellos, de sentimientos de ética, d…
Deux espions armagnacs jugés à Dijon en 1430
2021
Premier folio du procès de Vincent Gayet, originaire de Lyon, envoyé par le bâtard d’Orléans pour espionner au profit des Armagnacs Archives départementales de la Côte-d’Or (cl. Rudi Beaulant) La série B II 360 des archives départementales de la Côte-d’Or, qui contient les enquêtes et procès criminels instruits par la mairie de Dijon de la fin du XIVe siècle à la veille de la Révolution française, et jugés par le maire et les échevins, contient nombre d’affaires classiques (vols, rixes, inju...