Search results for "impact"
showing 10 items of 1703 documents
Incidence, severity and orthodontic treatment difficulty index of impacted canines in Saudi population
2018
Background The objective of this study was to assess the incidence, severity and orthodontic treatment difficulty of impacted maxillary canines in Saudi population. Material and methods This retrospective study included an investigation of panoramic radiographs for patients attended College of Dentistry, Jazan University, Saudi Arabia. The incidence of canine impaction and orthodontic treatment difficulty index of maxillary canine impaction was assessed based on; (1) patient age, (2) vertical position, (3) buccolingual position, (4) horizontal position, (5) incisors alignment, (6) canine space, (7) midline coincidence, (8) rotation of impacted tooth. Statistical analyses were calculated by …
Comparative study of the anesthetic efficacy of 4% articaine versus 2% lidocaine in inferior alveolar nerve block during surgical extraction of impac…
2007
Background: A comparative study is made of the anesthetic efficacy of 4% articaine versus 2% lidocaine, both with epinephrine 1:100,000, in truncal block of the inferior alveolar nerve during the surgical extraction of impacted lower third molars. Study design: A randomized double-blind clinical trial was conducted of 30 patients programmed for the bilateral surgical extraction of symmetrical lower third molars in the context of the Master of Oral Surgery and Implantology (University of Barcelona, Barcelona, Spain). Following the obtainment of informed consent, two operators performed surgery on an extemporaneous basis, using as local anesthetic 4% articaine or 2% lidocaine with the same co…
Government Economic Regulations in the Sphere of Higher Education during COVID-19 Crisis in Central Asia
2021
Bakalaura darbā tiek pētīta valsts ekonomiskā iejaukšanās, izmantojot augstākās izglītības ekonomisko regulējumu piemēru Vidusāzijā laikā no 2020. gada marta līdz 2021. gada martam. Mērķis ir salīdzināt COVID-19 krīzes ekonomisko ietekmi uz augstāko izglītību un ieviestajiem ekonomikas noteikumiem. Autors pētījumu veic daļēji strukturētu interviju veidā ar vadošo Vidusāzijas augstskolu pārstāvjiem. Galvenā atklātā problēma ir nesagatavotība ātrai pārejai uz tālmācību. Visbiežākie iemesli ir retā tiešsaistes studiju programmu prakse un sabiedrisko preču, piemēram, stabila interneta pieslēguma un elektrības, nodrošināšana. Pētījums arī parādīja, ka reģionā visplašāk izmantotais regulatīvais r…
Life cycle methods for environmental assessment of nanotechnology
2012
Tämä tutkielma on kirjallisuuskatsaus, joka antaa yleissilmäyksen erilaisiin elinkaarimetodeihin, joilla voidaan arvioida nanoteknologiaa sisältävien tuotteiden ympäristövaikutuksia. Työssä selvitetään elinkaariajattelun tärkeys ja kuvataan erilaisia ympäristöarviointimenetelmiä. Tässä tutkielmassa tarkastellut menetelmät ovat elinkaariarvionti (LCA), hiilijalanjälki, vesijalanjälki, ekologinen jalanjälki ja ekologinen selkäreppu (MIPS). Työ käsittelee nanoteknologiaan liittyviä ympäristöasioita ja tarkastelee elinkaarimenetelmien soveltamista ja soveltuvuutta nanoteknologiaan. Työn tuloksena raportoidaan, että kuvatut ympäristöarviointimenetelmät soveltuvat nanoteknologian vaikutusten arvi…
Structural and functional characterization of IMPACT proteins: a novel nuclease family
2016
Tesis doctoral, 183 páginas, tablas y figuras.
Review on Life Cycle Assessment of Solar Photovoltaic Panels
2020
The photovoltaic (PV) sector has undergone both major expansion and evolution over the last decades, and currently, the technologies already marketed or still in the laboratory/research phase are numerous and very different. Likewise, in order to assess the energy and environmental impacts of these devices, life cycle assessment (LCA) studies related to these systems are always increasing. The objective of this paper is to summarize and update the current literature of LCA applied to different types of grid-connected PV, as well as to critically analyze the results related to energy and environmental impacts generated during the life cycle of PV technologies, from 1st generation (traditiona…
Competitiveness and Sustainability in tourist firms and destinations
2020
Tourism is a major activity in the global economy, not only in terms of its economic impact but also its social and environmental implications. The management practices and processes adopted by tourist companies and destinations are very heterogeneous and have variable impacts on the triple-bottom-line sustainability (people, profit, planet) of the ecosystem. However, there is still only limited available knowledge about the value of different practices for promoting both sustainable development and greater competitiveness. This Special Issue includes papers that present new ideas, theories, advancements, experiences, evidence or methodologies that support the convergence of economic, socia…
Energy and environmental assessment of retrofit actions on a residential building
2014
Energy and environmental performances of buildings strictly depend on many factors related to the choice of construction materials, technical equipment, installation and use. In the following chapter a set of retrofit actions to improve the thermal performance of an existing conventional building is presented. The energy and environmental assessment of these actions is carried out following a life cycle approach. The embodied energy and the environmental impacts arisen from the production, transportation and installation phases of the required materials and components are calculated. Further, energy saving and environmental benefits and drawbacks concerning the assessed retrofit actions are…
Comparative environmental analysis of soil sampling methods in precision agriculture for lime application in Paraná State, Brazil
2020
Precision agriculture (PA) provides techniques that favour the localized application of inputs allowing their rational use. This makes the PA a potential indicator of reduced operational costs, input volume, and environmental impacts. The objective of this study was to evaluate and compare the environmental effects of three different sampling methods used in PA for the lime application. The first sampling method evaluated was the grid sampling (GS). It was performed at a density of one sample per hectare in a 100×100 m georeferenced grid. The second method was the directed sampling, that was performed after defining the management zones by soil apparent electrical conductivity (ECa) using a…
On the use of unmanned aerial systems for environmental monitoring
2018
[EN] Environmental monitoring plays a central role in diagnosing climate and management impacts on natural and agricultural systems; enhancing the understanding of hydrological processes; optimizing the allocation and distribution of water resources; and assessing, forecasting, and even preventing natural disasters. Nowadays, most monitoring and data collection systems are based upon a combination of ground-based measurements, manned airborne sensors, and satellite observations. These data are utilized in describing both small-and large-scale processes, but have spatiotemporal constraints inherent to each respective collection system. Bridging the unique spatial and temporal divides that li…