Search results for " GAP"

Defect-controlled hypersound propagation in hybrid superlattices

2013

We employ spontaneous Brillouin light scattering spectroscopy and detailed theoretical calculations to reveal and identify elastic excitations inside the band gap of hypersonic hybrid superlattices. Surface and cavity modes, their strength and anticrossing are unambiguously documented and fully controlled by layer thickness, elasticity, and sequence design. This new soft matter based superlattice platform allows facile engineering of the density of states and opens new pathways to tunable phoxonic crystals.

Coherent superposition of current flows in an atomtronic quantum interference device

2015

We consider a correlated Bose gas tightly confined into a ring shaped lattice, in the presence of an artificial gauge potential inducing a persistent current through it. A weak link painted on the ring acts as a source of coherent back-scattering for the propagating gas, interfering with the forward scattered current. This system defines an atomic counterpart of the rf-SQUID: the atomtronics quantum interference device (AQUID). The goal of the present study is to corroborate the emergence of an effective two-level system in such a setup and to assess its quality, in terms of its inner resolution and its separation from the rest of the many-body spectrum, across the different physical regime…

Reduced herbicide use does not increase crop yield loss if it is compensated by alternative preventive and curative measures

2018

Herbicide use must be reduced because of environmental and health issues. This raises the question of whether weeds and the resulting crop yield loss will increase. Previous studies analysing relationships between herbicide use intensity, weeds and yield loss suffer from methodological shortcomings in terms of weed flora and farm diversity as well as temporal scales. Here, we collected data on 272 arable cropping systems from one Spanish and six French regions, from farm surveys, the Biovigilance-Flore network, expert opinion, cropping system trials, crop advisors and scientists. Each system was simulated over 27 years and with 10 weather repetitions, using the virtual-field model FlorSys. …

Tracking Ideal Varieties and Cropping Techniques for Agroecological Weed Management: A Simulation-Based Study on Pea.

2022

Book of abstract p.110-111; International audience; Pea (Pisum sativum L.) is a key diversification crop but current varieties are not verycompetitive against weeds. The objective of this study was to identify, depending on the typeof cropping system and weed flora, (1) the key pea parameters that drive crop production,weed control and weed contribution to biodiversity, (2) optimal combinations of peaparameter values and crop-management techniques to maximise these goals. For this, virtualexperiments were run, using FLORSYS, a mechanistic simulation model (Colbach et al., 2021,Field Crops Res 261:108006). This individual-based 3D model simulates daily crop-weed seedand plant dynamics over t…

Estimating the effect of early schooling on reducing the socioeconomic gap incognitive and non-cognitive outcomes

2022

Skills Matching for a Greener Industry 4.0 : A Literature Review

2022

Manufacturing industry has historically had a very high leverage on environmental impact. Therefore, it is urgent to identify how the industry and its employees can contribute to change towards a sustainable society. Industry leaders need to enable their employees to create sustainable solutions, using technologies rising in industry 4.0. However, nowadays there are also critical discussions about whether this trend has reached our workplace settings in a satisfactory way. Namely, there is a growing skill gap among employees in manufacturing industries causing a lack of capability to match skill needs for fast technological development and requirements on sustainability. The resulting misma…

Continuità e discontinuità con il passato

2008

Kestävä kehitys -aiheisen projektityön vaikutus 8.-luokkalaisten ympäristöasenteisiin ja käyttäytymiseen

2017

Ihmisen ja luonnon hyvinvoinnin kannalta on tärkeää, että ihmiset oppivat elämään kestävän kehityksen periaatteiden mukaisesti. Nuorten asenteet ympäristöä kohtaan ovat myönteisiä, mutta asenteet eivät heijastu suoraan käyttäytymiseen. Ympäristökasvatuksen tavoitteena on mahdollistaa jokaiselle ihmiselle kestävään elämään tarvittavien tietojen, taitojen ja asenteiden omaksuminen. Kestävään elämäntapaan kuuluu yksilötason toiminta, kuten kulutustottumukset, sekä yhteiskunnallinen osallistuminen ja vaikuttaminen. Kestävän elämäntavan opetuksen tulisi sisältää oman lähiympäristön asioihin vaikuttamisen harjoittelemista omassa oppilaitoksessa sekä yhteistyössä muiden yhteiskunnan toimijoiden ka…

Doping induced stable room temperature dual emission from gadolinium doped vacancy ordered double halide perovskite, Gd:Cs2SnCl6

2022

The recent advancement in bandgap engineering through controlled doping has widen the prospectof vacancy ordered double halide perovskites (VO DHPs) by conferring them with designableoptoelectronic properties. Here, we report synthesis of Gd doped Cs2SnCl6 via a simplesolvothermal method. Gd3+ ions doping lowers the band gap from 3.8 eV to 2.8 eV and facilitatesstable room temperature dual PL emission centered at 440 nm and 610 nm. The macroscopicemission process is well supported by the confocal PL emission studies on isolated crystallites.Both the pristine (Cs2SnCl6) and Gd:Cs2SnCl6 exhibit crystalline cubic structure with Fm3m spacegroup. Rietveld refinement correlates well with the cubi…

Characterization and Investigation of NLO Properties of some Selected Electrodeposited Polythiophenes

2009

In this work we study the electronic properties of ClO− doped polythiophenes and discuss the nonlinear optical properties of these organic 4 compounds galvanostatically electrodeposited on ITO glasses. The investigation on the electronic properties (band gap, flat band potential) was performed by means of a non-destructive optical technique, photocurrent spectroscopy (PCS). The investigation on the nonlinear optical response was carried out by means of second and third harmonic generation (SHG and THG) measurements. In particular, the effect of the oxidation state of the polymeric films was studied by comparing the NLO response of oxidized and reduced polythiophenes. Reduced poly- meric films …