Search results for "Pressure"
showing 10 items of 4493 documents
ChemInform Abstract: Tuning the Band Gap of PbCrO4Through High-Pressure: Evidence of Wide-to-Narrow Semiconductor Transitions.
2014
Commercial polycrystalline and cleaved platelets from natural PbCrO4 are studied in a diamond anvil cell at ≤ 21 GPa.
Have tractor manufacturers bore in mind soil compaction over the last 40 years?
2019
Soil compaction is the compression of soil particles in a lower volume as a consequence of the reduction of the spaces existing among the particles themselves. This phenomenon is caused by natural forces and, above all, human ones. In order to estimate the field damages that can be caused by the traffic of agricultural machines, the load and the mean pressure applied by the tyres onto the soil can be measured. The research aim is to determine the pressure applied by each considered tractor onto the soil, in order to evaluate the effect of the traffic of tractors onto the soil itself. A total of 783 wheeled tractors manufactured and marketed in the last 35 years (1979-2014) was investigated.…
Low-Head Hydropower for Energy Recovery in Wastewater Systems
2022
Hydraulic turbines for energy recovery in wastewater treatment plants, with relatively large discharges values and small head jumps, are usually screw Archimedes or Kaplan types. In the specific case of a small head jump (about 3 m) underlying a rectangular weir in the major Palermo (Italy) water treatment plant, a traditional Kaplan solution is compared with two other new proposals: a Hydrostatic Pressure Machine (HPM) located at the upstream channel and a cross-flow turbine (CFT) located in a specific underground room downstream of the same channel. The fluid mechanical formulations of the flow through these turbines are analyzed and the characteristic parameters are stated. Numerical ana…
Low energy calibration, continuous monitoring, and background studies for the NEXT-White detector at the LSC
2021
Los neutrinos han sido una puerta a grandes cambios en los paradigmas del entendimiento de la naturaleza, y aún tienen preguntas que responder en las próximas décadas. El descubrimiento de la oscilación de neutrinos implica que éstos son partículas con masa. Esta masa abre la cuestión de su origen, es decir, si son fermiones de Dirac o de Majorana. La potencial naturaleza de Majorana puede arrojar luz en temas abiertos como la baja escala de masas de los neutrinos con respecto a los demás fermiones, así como la asimetría entre materia y antimateria observada actualmente en el universo. De entre todas las posibles formas de discernir la naturaleza última de los neutrinos, la más madura y des…
Inter- and Intraobserver Variation in the Assessment of Preoperative Colostograms in Male Anorectal Malformations: An ARM-Net Consortium Survey
2020
Aim:Male patients with anorectal malformations (ARM) are classified according to presence and level of the recto-urinary fistula. This is traditionally established by a preoperative high-pressure distal colostogram that may be variably interpreted by different surgeons. The aim of this study was to evaluate the inter- and intraobserver variation in the assessment by pediatric surgeons of preoperative colostograms with respect to the level of the recto-urinary fistula. Materials and Methods:Sixteen pediatric surgeons from 14 European centers belonging to the ARM-Net Consortium twice scored 130 images of distal colostograms taken in sagittal projection at a median age of 66 days of life (rang…
The Origin of Non-thermal Fluctuations in Multiphase Flow in Porous Media
2021
Core flooding experiments to determine multiphase flow in properties of rock such as relative permeability can show significant fluctuations in terms of pressure, saturation, and electrical conductivity. That is typically not considered in the Darcy scale interpretation but treated as noise. However, in recent years, flow regimes that exhibit spatio-temporal variations in pore scale occupancy related to fluid phase pressure changes have been identified. They are associated with topological changes in the fluid configurations caused by pore-scale instabilities such as snap-off. The common understanding of Darcy-scale flow regimes is that pore-scale phenomena and their signature should have a…
The global spread of the concept of cultural policy
2020
The article studies UNESCO's program that, from the late 1960s onward, aimed at spreading globally the concept of cultural policy. An essential part of the program, UNESCO invited member states from different regions of the world to prepare reports on national cultural policy. That was successful in spreading cultural policy as a concept and as a governmental structure. Except for only Australia, Canada and the United States, in which cultural policy is handled at a sub-state level, all countries that produced a national report have established a ministry of culture, typically synchronously with the report. The analysis suggests that UNESCO's success was due to two factors: the process of d…
Illicit drugs consumption evaluation by wastewater-based epidemiology in the urban area of Palermo city (Italy)
2017
Introduction. A wastewater-based epidemiology approach was performed to estimate the drug consumption in Palermo city, the fifth largest city of Italy with a population of 671 696 inhabitants, and to investigate the monthly variability of drug loads in wastewater from different areas of the city. A seven-months detection campaign was conducted at the two wastewater treatment plants of the city. Methods. Following a pre-treatment, 32 samples of wastewater were analyzed by liquid chromatography-tandem mass spectrometry. Results. We estimated a mean cocaine use in Palermo of 0.19 g/day/1000 people, corresponding to 1.90 doses/1000 people and cannabinoids use of 2.85 g/day/1000 people, correspo…
THE ROLE OF THE STATE IN ACCOMPLISHING THE HEDGING OF ECONOMIC COMPETITION
2013
The project DINAUTIS: an ecosystem approach to assess effects of recreational boating noise on Marine Protected Areas
2009
Anthropogenic noise, generated by recreational and commercial boating, affects ecological responses of marine species particularly where the noise is chronic like coastal areas largely exploited by tourism. To date, most research to seek direct relationships between noise and ecological responses of biota is based on laboratory experiments, while scant information is available from at whole-of-ecosystem level from the wild. DINAUTIS is a project designed to study the multi-level ecological response of marine biota subjected to chronic noise and the effect of some “by product” of recreational boating (e.g. PAH contamination). Thus, in the present study, we report on different aspects studied…