Search results for "ToF"
showing 10 items of 841 documents
Tropical troposphere to stratosphere transport of carbon monoxide and long-lived trace species in the Chemical Lagrangian Model of the Stratosphere (…
2014
Variations in the mixing ratio of trace gases of tropospheric origin entering the stratosphere in the tropics are of interest for assessing both troposphere to stratosphere transport fluxes in the tropics and the impact of these transport fluxes on the composition of the tropical lower stratosphere. Anomaly patterns of carbon monoxide (CO) and long-lived tracers in the lower tropical stratosphere allow conclusions about the rate and the variability of tropical upwelling to be drawn. Here, we present a simplified chemistry scheme for the Chemical Lagrangian Model of the Stratosphere (CLaMS) for the simulation, at comparatively low numerical cost, of CO, ozone, and long-lived trace substances…
The ACRIDICON-CHUVA campaign: Studying tropical deep convective clouds and precipitation over Amazonia using the new German research aircraft HALO
2016
Abstract Between 1 September and 4 October 2014, a combined airborne and ground-based measurement campaign was conducted to study tropical deep convective clouds over the Brazilian Amazon rain forest. The new German research aircraft, High Altitude and Long Range Research Aircraft (HALO), a modified Gulfstream G550, and extensive ground-based instrumentation were deployed in and near Manaus (State of Amazonas). The campaign was part of the German–Brazilian Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud Systems–Cloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving Modeling and to the GPM (Global Precipitatio…
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 …
KEY FACTORS FOR SUCCESS IN AGRIFOOD FIRMS: THE CASE OF SPANISH FRUIT & VEGETABLES COOPERATIVES
2015
El tamaño es una variable contingente que puede influir en los resultados de las empresas. En este trabajo se pretende contrastar la existencia o no de una relación significativa entre tamaño y resultados empresariales de las empresas agrarias, en particular de las cooperativas hortofrutícolas españolas. Para ello, se realiza un estudio empírico en base a la información económica y financiera obtenida de los registros oficiales de las cooperativas agrarias dedicadas a la comercialización de frutas y hortalizas sobre el cual se ha aplicado un análisis de regresión. El estudio demuestra que no existe una relación significativa positiva entre los resultados empresariales y el tamaño de este ti…
Exploring the apparent properties and Q-markers for quality control of Cornus officinalis
2023
Cornus officinalis Siebold & Zucc. has a high nutritious value and is widely used in food fields. To distinguish the quality of cornus in different areas, this research provided a new strategy for comprehensively evaluating cornus. As a result, 12 iridoid glycosides and 7 polyphenols were identified and quantified by UHPLC-Q-TOF/MS in 13 batches of samples from five different origins. Chromaticity analysis pointed out that pelargonidin-3-O-galactoside, total iridoids, and total polyphenols performed high relation with 1365*. Antioxidant activity and inhibition of α-glucosidase effect correlated with the chemical analysis suggested that iridoid glycosides and polyphenols should represent…
Corporazioni, maestranze e mestieri d’arte a Palermo al tempo di Giacomo Amato (1643-1732)
2017
Ci si sofferma sull'attività poliedrica delle varie corporazioni e maestranze palermitane il cui operato, tra la seconda metà del XVII e i primi decenni del secolo successivo, è affiancato dall'estro creativo di Giacomo Amato e da altre emergenti personalità che incisero notevolmente nel rinnovamento artistico della città di Palermo.
Exact Coulomb cutoff technique for supercell calculations in two dimensions
2009
We present a reciprocal space technique for the calculation of the Coulomb integral in two dimensions in systems with reduced periodicity, i.e., finite systems, or systems that are periodic only in one dimension. The technique consists in cutting off the long-range part of the interaction by modifying the expression for the Coulomb operator in reciprocal space. The physical result amounts in an effective screening of the spurious interactions originated by the presence of ghost periodic replicas of the system. This work extends a previous report [C. A. Rozzi et al., Phys. Rev. B 73, 205119 (2006)], where three-dimensional systems were considered. We show that the use of the cutoffs dramatic…
Joint Audit, Audit Market Structure, and Consumer Surplus
2017
We use a structural application of the discrete choice model to investigate how the introduction of a joint audit policy would affect audit market structure and consumer surplus. We perform this policy evaluation by identifying demand fundamentals in a joint audit regime and applying them to a single audit regime. We find that a joint audit requirement has the potential to change the audit market structure substantially but that the effects are sensitive to the specific policy design. For example, small audit firms gain market share in a joint audit regime but only if an equal sharing of the workload between the two joint auditors is not required. Our counterfactual analysis reveals that th…
Limits on anomalous trilinear gauge boson couplings from WW, WZ and Wγ production in pp¯ collisions at s=1.96 TeV
2012
We present searches for the anomalous γWW and ZWW trilinear gauge boson couplings from WW and WZ production using lepton plus dijet final states and a combination with results from Wγ, WW, and WZ production with leptonic final states. The analyzed data correspond to up to 8.6fb -1 of integrated luminosity collected by the D0 detector in pp- collisions at s=1.96TeV. We set the most stringent limits at a hadron collider to date assuming two different relations between the anomalous coupling parameters δκ γ, λ, and δg1Z for a cutoff energy scale Λ=2TeV. The combined 68% C.L. limits are -0.057lδκ γl0.154, -0.015lλl0.028, and -0.008lδg1Zl0.054 for the LEP parameterization, and -0.007lδκl0.081 an…
La identidad en juego: un acercamiento autoficcional a La casa en Mango Street
2020
Este artículo explica la construcción autoficcional de La casa en Mango Street, obra de la chicana Sandra Cisneros. Parte de la base teórica que considera la autoficción como un género no subordinado a otros, siguiendo la posición de Vera Toro, y elabora un estudio de las claves poéticas de la obra, así como de las condiciones sociohistóricas en que ha sido escrita. Analiza también cómo es el espacio el elemento narrativo fundamental que permite establecer una relación entre la creación literaria, la creación de identidad del pueblo chicano y la de la mujer-narradora de la obra. En este estudio no perdemos tampoco de vista el fuerte carácter crítico del texto: por un lado, observaremos la i…