Search results for "second"
showing 10 items of 3671 documents
The Role of Excited Oxygen Molecules in the Formation of the Secondary Ozone Layer at 87 to 97 km
2018
The secondary ozone layer is located at elevations of 87 to 97 km in the upper mesosphere – lower thermosphere. It overlaps with the ionospheric D-layer. Daytime intensive UV radiation is dissociating O2 molecules to O atoms and photoexcitating O2 molecules up to 11.07eV level. Ozone photolysis between the wavelengths of 118.7–121.6 nm produces three oxygen atoms from one ozone molecule. Collision reactions of O2(B3 Σu —) and O2(X3 Σg —, υ≥26) with O2(X3 Σg —, υ=0) produce additional oxygen atoms. The number of oxygen atoms is maintained at such a high level that a small but significant ozone concentration survives. UV radiation weakens radically during the night. The number of O atoms show…
Quale formazione iniziale per gli insegnanti di scuola secondaria dopo l’abolizione dei FIT?
2019
The article frames the general and specific competences initially requested to secondary school teachers, it identifies their constitutive pillars, it presents the most recent contributions on the professional competences of teachers, it makes a critical-problematic assessment of the issues being resolved in Italy and of those that are still open.
Reading Comprehension in Both Spanish and English as a Foreign Language by High School Spanish Students
2022
Several studies have highlighted that reading comprehension is determined by different linguistic skills: semantics, syntax, and morphology, in addition to one’s own competence in reading fluency (accuracy, speed, and prosody). On the other hand, according to the Linguistic Interdependence Hypothesis, linguistic skills developed in one’s own native language (L1) facilitate the development of these skills in a second one (L2). In this study, we wanted to explore the linguistic abilities that determine reading comprehension in Spanish (L1) and in English (L2) in Secondary Education students. To do this, 73 Secondary Education Students (1st and 3rd year) participated in this study. The student…
Dynamics of soil organic matter pools after agricultural abandonment
2014
Changes of land use from croplands to natural vegetation usually increase Carbon (C) stocks in soil. However, the contribution of old and new C to various pools still is not clearly analyzed.We measured the 13C signature of soil organic carbon (SOC) pools after vegetation change from vineyard (C3) to grassland (C4) under Mediterranean climate to assess the changes of old and new C in total SOC, microbial biomass (MB), dissolved organic C (DOC), and CO2 efflux from soil. Development of the perennial grass Hyparrhenia hirta (C4) on vineyard abandoned for 15 or 35 years ago increased C stocks for 13% and 16%, respectively (in the upper 15 cm). This increase was linked to the incorporation of n…
THE EVOLUTION OF THE SEWAGE TREATMENT PROCESS IN ROMANIA IN THE LAST 30 YEARS: CASE STUDY RÂMNICU VÂLCEA
2012
The evolution of the sewage treatment process in Romania in the last 30 years: case study Râmnicu Vâlcea. Most studies made at national level in the domain of hydrology target the surface water topic, analyzing the hydrometric and hydrologic characteristics and the quality of the water for certain catchment areas. This paper aims instead the relatively new field of urban hydrology, more exactly the urban wastewater treatment process. The study is based on the observations made in the first half of the year 2010 at the wastewater treatment plant from Râmnicu Vâlcea and on the analysis of some relevant wastewater quality indicators before and after the treatment process for the period between…
Gli studenti stranieri nelle università italiane
2021
La popolazione dei giovani di origine immigrata iscritti all’università è in costante crescita nel contesto italiano, risultato di fattori di spinta e di attrazione complessi, legati tanto al processo di internazionalizzazione del sistema universitario italiano quanto alla storia migratoria del Paese, in cui i figli degli immigrati sono adesso in età per iscriversi all’università. Coesistono, infatti, due realtà della presenza straniera profondamente diverse nel sistema dell’istruzione post-secondaria. La prima è costituita dagli studenti stranieri in senso stretto, espressione di una mobilità internazionale per motivi di studio, che accedono all’università con un diploma conseguito all’est…
L’épuration et la désépuration en France au lendemain de la Seconde Guerre mondiale
2014
International audience
La città che non c’era. Lo sviluppo urbano di Palermo nel secondo dopoguerra
2020
Recensione del libro "La città che non c’era. Lo sviluppo urbano di Palermo nel secondo dopoguerra" di Fabrizio Pedone.
De joven a mujer: persistencia de prácticas culturales en los procesos de definición de la identidad y de la pertenencia en las jóvenes de origen ext…
2016
La experiencia de la migración altera la linealidad de las relaciones intergeneracionales, tanto en el plano de los valores morales, como en aquello cultural, al ser un evento/experiencia de completo cambio de la realidad familiar (Scabini & Rossi, 2008) e del ambiente de vida (Yeoh, 2000). Las características y los tiempos de transformación dependen sobre todo, del tipo de relación entre la familia inmigrada y la sociedad que la acoge, del espacio social accesible para los inmigrados de segunda generación y del tiempo empleado por la estructura familiar en la reelaboración de los valores tradicionales de pertenencia. La relación entre las generaciones que se define, por muchos padres extra…
A black-box, general purpose quadratic self-consistent field code with and without Cholesky Decomposition of the two-electron integrals
2021
We present the implementation of a quadratically convergent self-consistent field (QCSCF) algorithm based on an adaptive trust-radius optimisation scheme for restricted open-shell Hartree���Fock (ROHF), restricted Hartree���Fock (RHF), and unrestricted Hartree���Fock (UHF) references. The algorithm can exploit Cholesky decomposition (CD) of the two-electron integrals to allow calculations on larger systems. The most important feature of the QCSCF code lies in its black-box nature ��� probably the most important quality desired by a generic user. As shown for pilot applications, it does not require one to tune the self-consistent field (SCF) parameters (damping, Pulay's DIIS, and other simil…