Academic literature on the topic 'SIESTSA'

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Journal articles on the topic "SIESTSA"

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Antezana, Alejandro N., Rodrigo Vallejos, Mabel Encinas, Erika V. Antezana, and Ariel O. Antezana. "Somnolencia diurna excesiva en estudiantes de la Facultad de Medicina de la Universidad Mayor de San Simón." Gaceta Medica Boliviana 41, no. 2 (October 12, 2020): 14–17. http://dx.doi.org/10.47993/gmb.v41i2.130.

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Objetivo: el objetivo primario es determinar si los estudiantes de medicina de la Universidad Mayor de San Simón (UMSS) sufren de somnolencia diurna excesiva mediante el uso de la Escala de somnolencia de Epworth (ESE). Métodos: Se trata de un estudio transversal, descriptivo. Estudiantes de medicina de la UMSS completaron una encuesta la cual incluía datos demográficos, escala del sueño de Epworth traducida al español, número de horas nocturnas de sueño, siestas y uso de estimulantes del SNC durante el mes anterior a la realización de la encuesta. Resultados: el universo consistió en 1923 estudiantes y la muestra en 324 estudiantes del primer al quinto curso de carrera de medicina (5% margen de error, 95% nivel de confianza); 57% del sexo femenino, media de edad de 21 años (±2,1), la media de la escala de Epworth fue de 9 (±3,3) (95% IC 8,46-9,54); 23,6% presentó algún grado de somnolencia diurna excesiva; 67% de los estudiantes indican dormir 4-6 hrs diarias; 79% goza entre 5 – 90 minutos de siesta cada día durante el mes anterior a la encuesta; 76% reporta usar algún tipo de estimulante del sistema nervioso central. Conclusiones: un porcentaje menor pero relevante de estudiantes de medicina de la UMSS tiene algún grado de somnolencia diurna excesiva. Este menor porcentaje puede deberse al uso de siestas; habito comúnmente practicado en nuestro país.
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Mohammad, Yousef. "Siesta and Risk for Ischemic Stroke: Results from a Case-Control Study." Medicina 56, no. 5 (May 7, 2020): 222. http://dx.doi.org/10.3390/medicina56050222.

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Background and objectives: Siesta, which is a short afternoon nap, is a habit that is commonly practiced in the Mediterranean and tropical areas. Data on the association between siesta and coronary artery disease has been conflicting. A protective effect has been demonstrated in the countries that commonly practice siesta, but a harmful effect has been observed in the countries that infrequently practice the siesta habit. Information on the association between siesta and ischemic stroke has been, however, lacking. Hence, the purpose of our study was to determine the effect of siesta on ischemic stroke. Materials and Methods: This was a case-control study, conducted on the patients with acute ischemic stroke who came for their first follow-up visit to the neurology clinic. Controls were randomly selected from the patients visiting the neurology clinic on the same day as the patients with ischemic stroke. In addition to basic demographics and the occurrence of established stroke risk factors, information about siesta practice was also collected from both groups. A multivariate logistic regression analysis was utilized to determine the relationship between siesta practice and ischemic stroke. Results: A total of 206 patients were recruited from the neurology clinic of King Khalid university hospital; of which only 194 subjects were included in the analysis (98 ischemic stroke cases and 96 controls). The mean age of the participants was 59.68 ± 13.75 years and 98 (50.52%) were male. Interestingly, 43% of the whole study cohort practiced regular siesta. However, when compared to the stroke population, the control group practiced siesta more frequently (30% vs. 56%). In a multivariate logistic regression analysis, hypertension, diabetes mellitus, excess body weight (body mass index > 25 kg/m2) and dyslipidemia were found to increase the risk of ischemic stroke (OR 2.12, 95% CI: 1.02–4.66, p = 0.005; OR 2.72, 95% CI: 1.94–4.88, p = 0.014; OR 2.94, 95% CI: 1.5164–5.7121 p = 0.0014; OR 3.27, 95% CI: 2.42–5.199, p ≤ 0.001, respectively). On the contrary, the practice of regular siesta lowered the risk of ischemic stroke (OR 0.58, 95% CI: 0.3551–0.9526, p = 0.031). Conclusions: Siesta was associated with a reduced risk for the occurrence of ischemic stroke. Large prospective longitudinal studies should be conducted to verify the protective effect of siesta on stroke.
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Aurora Luque and Mark Aldrich. "Epicurus' Siesta." Sirena: poesia, arte y critica 2008, no. 2 (2008): 13. http://dx.doi.org/10.1353/sir.0.0040.

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Carlos Kaski, Juan, José María Cruz Fernández, and Daniel Fernández-Bergés. "El estudio SIESTA." Revista Española de Cardiología 56, no. 9 (January 2003): 929. http://dx.doi.org/10.1016/s0300-8932(03)76985-1.

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TULLO, ALEX. "AN INDUSTRY SIESTA." Chemical & Engineering News 83, no. 47 (November 21, 2005): 36. http://dx.doi.org/10.1021/cen-v083n047.p036.

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Muhkerjee, Dipika. "Drive; Siesta; Avanti." World Literature Written in English 37, no. 1-2 (January 1998): 114–17. http://dx.doi.org/10.1080/17449859808589294.

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Lucas Pérez-Romero, Javier, Francisco Hernández Fernández, Jorge García García, M. ª. Belén González Ramírez, and Marta Lucas Pérez-Romero. "Siesta poco reparadora." Revista Clínica de Medicina de Familia 7, no. 3 (October 2014): 223–26. http://dx.doi.org/10.4321/s1699-695x2014000300007.

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Kaski, Juan Carlos, José María Cruz Fernández, and Daniel Fernández-Bergés. "El estudio SIESTA." Revista Española de Cardiologia 56, no. 9 (September 2003): 929. http://dx.doi.org/10.1157/13051624.

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Rappelsberger, P., E. Trenker, Ch Rothmann, G. Gruber, P. Sykacek, St Roberts, G. Klösch, et al. "Das Projekt SIESTA." Klinische Neurophysiologie 32, no. 02 (December 31, 2001): 76–88. http://dx.doi.org/10.1055/s-2001-16206.

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Rappelsberger, P., E. Trenker, G. Klösch, and J. Hajek. "DIE SIESTA DATENBANK." Biomedizinische Technik/Biomedical Engineering 45, s1 (2000): 437–38. http://dx.doi.org/10.1515/bmte.2000.45.s1.437.

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Dissertations / Theses on the topic "SIESTSA"

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Vafaeyan, Shadi. "A Density Functional Theory of a Nickel-based Anode Catalyst for Application in a Direct Propane Fuel Cell." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23316.

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The maximum theoretical energy efficiency of fuel cells is much larger than those of the steam-power-turbine cycles that are currently used for generating electrical power. Similarly, direct hydrocarbon fuel cells, DHFCs, can theoretically be much more efficient than hydrogen fuel cells. Unfortunately the current densities (overall reaction rates) of DHFCs are substantially smaller than those of hydrogen fuel cells. The problem is that the exchange current density (catalytic reaction rate) is orders of magnitude smaller for DHFCs. Other work at the University of Ottawa has been directed toward the development of polymer electrolytes for DHFCs that operate above the boiling point of water, making corrosion rates much slower so that precious metal catalysts are not required. Propane (liquefied petroleum gas, LPG) was the hydrocarbon chosen for this research partly because infrastructure for its transportation and storage in rural areas already exists. In this work nickel based catalysts, an inexpensive replacement for the platinum based catalysts used in conventional fuel cells, were examined using density functional theory, DFT. The heats of propane adsorption for 3d metals, when plotted as a function of the number of 3d electrons in the metal atom, had the shape of a volcano plot, with the value for nickel being the peak value of the volcano plot. Also the C-H bond of the central carbon atom was longer for propane adsorbed on nickel than when adsorbed on any of the other metals, suggesting that the species adsorbed on nickel was less likely to desorb than those on other metals. The selectivity of the propyl radical reaction was examined. It was found that propyl radicals
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Bergman, Anna, and Sevinc Sener. "SIESTA PÅ INTENSIVEN : Patientvila under dagtid." Thesis, Röda Korsets Högskola, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:rkh:diva-282.

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Bakgrund. Miljön på intensivvårdsavdelningen är fylld av olika stimuli i form av ljud och ljus. Sjuksköterskorna arbetar bedside och täta omvårdnadsåtgärder är nödvändiga för dessa kritiskt sjuka patienter. Denna miljö lämnar en liten möjlighet för sömn och vila. För att patienterna ska få möjlighet till vila under dagtid har vissa intensivvårdsavdelningar lagt in en period med mindre aktivitet, tysta timmen, också kallat patientvila. Målet med patientvilan är att erbjuda patienterna en timme med ostörd vila under dagtid. Syfte. Att undersöka patienternas möjlighet till vila under dagtid genom att observera antal utförda omvårdnadsåtgärder enligt VIPS sökordsmodell. Metod. En icke-deltagande strukturerad observationsstudie utfördes. Observationsprotokoll utformades med VIPS-sökordsmodell. Studien utfördes på två intensivvårdsavdelningar i Mellansverige, IVA 1 och IVA 2. Observationerna utfördes under åtta dagar. Observatörerna registrerade allt som skedde runt patienterna mellan klockan 12.00 – 13.00, då patientvilan ägde rum. Resultat. Totalt observerades 19 patientplatser på IVA 1 och IVA 2. Under de åtta tillfällen som observerades registrerades totalt 158 störningar, 101 av dessa störningar skedde på IVA 2 och 57 störningar skedde på IVA 1. Antalet störningsmoment per patient under patientvilan varierade från en till 18 stycken. På IVA 1 var de vanligaste störningsmomenten läkemedelshantering samt speciell omvårdnad. Miljö fick mest punktmarkeringar på IVA 2. Den enda åtgärden som inte förekom var träning. Totalt 152 störningsmoment utfördes av vårdpersonal. Slutsats. Patienterna blir störda under patientvilan med en mängd olika omvårdnadsåtgärder. Vissa åtgärder är nödvändiga och svåra att undvika, andra åtgärder hade kunnat prioriteras annorlunda. Klinisk betydelse. Att öka medvetenheten hos personalen angående betydelsen av sömn och vila för patienterna på intensivvårdsavdelning.
Background. The environment at the ICU (Intensive Care Unit) is filled with different stimuli of sound and light. Nurses work bedside for the critically ill patients, and frequent nursing interventions are required. This environment gives little possibility for sleep and rest. It is important to make sure that the patients will have the possibility to get sufficient amount of rest during the day. Some ICUs have addressed this by applying less activities during one hour per day, patient resting or quiet time. Purpose. To investigate patients' ability to rest during the day, by observing the number of performed nursing interventions according to the VIPS-model. Method. A non-participating structured observational study was performed. The observation protocol was designed with the VIPS-model. The study was conducted in two ICUs in central Sweden, ICU 1 and ICU 2. The observations were carried out during eight days. Observers registered everything that happened around the patients between the hour of 12:00 to 13:00, when the quiet time took place. Results. A total of 19 patients were observed on ICU 1 and ICU 2. A total of 158 interruptions were observed, 101 of these interruptions occurred in the ICU 2 and 57 interruptions occurred in the ICU 1. The number of interruptions during the quiet time varied from one to 18 distractions. The most common interruptions, for the ICU 1, were medication and special care. The environment was the most common distraction at the ICU 2. The only intervention that didn´t occur was training. A total of 152 distractions were performed by health professionals. Conclusions. The patients are disturbed during quiet time, with a variation of nursing interventions. Some interventions could have been prioritized differently, but other interventions were necessary and difficult to avoid. Relevance to clinical practice. To increase awareness among staff regarding the importance of sleep and rest for patients in ICU.
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Terni, Celeste. "Spanish Employment's Never-Ending Siesta: An Investigation of Hysteresis." Scholarship @ Claremont, 2019. https://scholarship.claremont.edu/cmc_theses/2034.

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The thesis investigates the behavior of Spain’s persistently high unemployment rate. Rigid labor laws, unemployment insurance generosity, and the demographics of the unemployed are part of the cause, but they are only underlying factors driving the hysteresis that has been present for nearly four decades. The thesis attempts to extract explanations for this persistence by comparing Spain to other countries, such as its next-door neighbor, Portugal. Special attention is placed on the role that recessions and subsequent changes in real GDP growth play in sustaining a high rate of unemployment.
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Bladh, Hanna. "Festivallandskapet i förändring : Siesta! – En liten musikfestival som står när jättarna faller." Thesis, Linnéuniversitetet, Institutionen för kulturvetenskaper, KV, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-13056.

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I denna uppsats undersöks hur några festivalarrangörer har upplevt och upplever det svenska festivallandskapet under 2010 och föregående år, med fokus på musikfestivalen Siesta!. Genom Siesta får studien en ung och relativt nyetablerad festivals syn på festivallandskapet och tar därmed plats för första gången inom svensk festivalforskning.   Syftet med denna uppsats är att kvalitativt undersöka hur Siesta har uppstått och utvecklats ur ett arrangörsperspektiv och hur den skiljer sig från andra likartade musikfestivaler såsom Arvikafestivalen, Hultsfredsfestivalen, Peace & Love, Way Out West, Popaganda och Emmabodafestivalen. Vidare analyseras det festivallandskap och det nätverk som dessa musikfestivaler befinner sig i. Utgångspunkten är att det sker och har skett en förändring med tanke på Hultsfredsfestivalens konkurs under sommaren 2010. Vad det är som har skett och hur det har påverkat festivalarrangörerna undersöks ur ett nutidsorienterat företags- och samhällsperspektiv.   Materialet som använts är intervjuer med två personer ur Siestas ledning, skriftlig intervju med representant för Popaganda samt källor som belyser festivallandskapet ur ytterligare festivalarrangörers perspektiv. De faktorer som förefaller påverka arrangörerna mest i deras resonemang kring festivallandskapet är de konkurrensmässiga och ekonomiska förutsättningarna i dagens samhälle. I det ligger andra festivalers påverkan, både internationellt och nationellt, Internets betydelse för utvecklingen samt festivalernas relation till sin omvärld vad gäller andra intressenter och aktörer och tvärtom.
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Hartmann, Julio Henrique. "GRAFENO INTERAGINDO COM MOLÉCULAS DE RESVERATROL E QUERCETINA VIA MODELAGEM MOLECULAR." Centro Universitário Franciscano, 2014. http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/531.

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In this work we examined theoretically via computer simulation of first principles, the interaction of graphene with the molecules of resveratrol and quercetin. To do this, use the Density Functional Theory and the pseudopotential method as implemented in the SIESTA computer code. Resveratrol is an antioxidant drug and several studies have highlighted and proven the benefits of resveratrol health. This has been shown flavonoid chemopreventive, antioxidant, antiplatelet, antifungal, anti-inflammatory, cardioprotective, among others. Quercetin is the main flavonoid present in the human diet and its therapeutic properties have been studied in recent decades, highlighting the potential antioxidant, anticarcinogenic and its protective effects on renal, cardiovascular and hepatic systems, and also has antimicrobial activity. However, these two drugs are very unstable. In this regard, the main motivation is to use graphene with these two drug molecules to overcome the instability of the same, because of the properties of graphene Its primary is exactly be electrochemically stable. Our results show that the most stable configuration for the binding energy of quercetin with graphene was 0.93 eV and resveratrol value found for the binding energy was 0.53 eV indicating the occurrence of weak interaction through physical adsorption. Analyzing the band structure of the interacting systems, we found that no significant changes occur in the electronic properties compared to pure graphene. The stability of the molecules was improved due to charge transfer and the decrease of the total energy of the molecules.
Neste trabalho analisamos, teoricamente, via simulação computacional de primeiros princípios, a interação do grafeno com as moléculas de resveratrol e quercetina. Para isso, utilizamos a Teoria do Funcional da Densidade e o método de pseudopotenciais conforme implementados no código computacional SIESTA. O resveratrol é um fármaco antioxidante e vários estudos têm destacado e comprovado os benefícios do resveratrol à saúde. Este flavonóide tem demonstrado propriedades quimiopreventivas, antioxidantes, antiplaquetárias, antifúngicas, anti-inflamatórias, cardioprotetoras, entre outras. A quercetina é o principal flavonóide presente na dieta humana e suas propriedades terapêuticas têm sido estudadas nas últimas décadas, destacando-se o potencial antioxidante, anticarcinogênico e seus efeitos protetores aos sistemas renal, cardiovascular e hepático, sendo que possui também atividade antimicrobiana. Entretanto, estes dois fármacos são bastante instáveis. Neste sentido, a principal motivação do trabalho é utilizar o grafeno com estas duas moléculas de fármacos para suprir a instabilidade das mesmas, pois uma das propriedades precípuas do grafeno é justamente ser eletroquimicamente estável. Nossos resultados mostram que para as configurações mais estáveis, a energia de ligação da quercetina com o grafeno foi de 0,93 eV e para o resveratrol o valor encontrado para a energia de ligação foi de 0,53 eV indicando a ocorrência de interação fraca por meio de adsorção física. Analisando a estrutura de bandas dos sistemas interagentes, observamos que não ocorrem alterações significativas nas propriedades eletrônicas quando comparadas com o grafeno puro. Em relação à estabilidade das moléculas houve uma melhora devido à transferência de carga, à diminuição da energia total das moléculas e ao fato de que não houve alteração significativa na geometria dos sistemas.
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Silva, Pedro Celso Alves. "INTERAÇÃO DE ANTIANSIOLÍTICOS COM GRAFENO: UMA ABORDAGEM TEÓRICA." Centro Universitário Franciscano, 2016. http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/547.

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The exaggerated use of anxiolytic drugs can cause environmental problems if there is no destination and treatment, leading to contamination of water resources and biological tissues and aquatic organisms. In addition, some microorganisms develop resistance to these drugs affect the ecosystem with its toxicity and remain in the environment, which justifies the growing concern about these environmental pollutants that were found in various parts of the world. There are some studies in the literature of the use of graphene as a filter for the removal of metals such as Na, Mg, K, Ca and Ni environment. Other studies show that graphene can be used to remove drugs such as aspirin, caffeine, acetaminophen and ciprofloxacin the aqueous media. The objective of this study was to evaluate, through computer simulations based on Density Functional Theory (DFT), the structural and electronic properties of anxiolytic drugs interacting with pure graphene, because until now few methods of treating wastewater for removal anxiolytic drugs are not effective, and in other cases the methods are expensive. In this study, we analyzed the interaction of pure graphene with anxiolytics (alprazolam, clonazepam, clobazam, diazepam and the nordiazepam) commonly found in the environment and highly resistant to photobleaching. The results show that the interaction of graphene with diazepam stabilized with binding energy ranging between -0.29 eV and -0.35 eV and load transfers between -0.002 e- and +0.036 e-. As for the nordiazepam interacting with graphene, the binding energy remained between -0.23 eV and -0.31 eV and cargo transfers between -0.002 e- and +0.069 e-. For alprazolam the binding energy remained between -0.19 eV and -0.86 eV and cargo transfers between -0.004 and +0.041 e-. For clobazam the binding energy varied between -0.23 eV and -0.76 eV and load transfers between -0.005 e- and +0.040 e- and clonazepam remained between -0.52 eV and -0, 75 eV and load transfer between -0.005 e- and +0.070 e-. For every interaction was observed which can occur graphene load transfer to the drug (indicated by positive values) or drug for graphene (indicated by negative values). There was a physical adsorption for all pure graphene interactions with anxiolytic drugs with binding energy ranging between -0.19 eV and -0.86 eV and a charge transfer between -0.018 e- and +0.070 e-, and that the electronic properties of the systems were not changed significantly. The results for the interaction of graphene with anxiolytics, are important to contribute to the development of filters to remove these drugs from aqueous media and sewage treatment plants, since there are no reports in the literature on the interaction of graphene with anxiolytic agents for through computer simulation.
O uso exagerado de fármacos ansiolíticos pode acarretar problemas ambientais, caso não haja destino e tratamento adequado, ocasionando a contaminação dos recursos hídricos e de tecidos biológicos e de organismos aquáticos. Além disso, alguns micro-organismos criam resistência a esses fármacos afetando o ecossistema com sua toxicidade e permanência no meio ambiente, justificando a crescente preocupação sobre estes poluentes ambientais que foram encontrados em várias partes do mundo. Já existem na literatura alguns estudos do uso do grafeno como filtro para remoção de metais como: Na, Mg, Ca, K e Ni do meio ambiente. Outros estudos mostram que o grafeno pode ser utilizado para remoção de fármacos como: aspirina, cafeína, acetaminofeno e ciprofloxacina dos meios aquosos. O objetivo deste trabalho é avaliar, por meio de simulações computacionais baseadas na Teoria do Funcional da Densidade (DFT), as propriedades estruturais e eletrônicas de fármacos ansiolíticos interagindo com o grafeno puro, pois até o presente momento alguns métodos de tratamento dos efluentes para remoção de ansiolíticos não são eficazes e em outros casos os métodos são caros. Neste estudo, foi analisada a interação do grafeno puro com os ansiolíticos (alprazolam, clobazam, clonazepam, diazepam e o metabólito nordiazepam) frequentemente detectados no meio ambiente e altamente resistentes a fotodegradação. Os resultados mostram que a interação do grafeno com o diazepam se estabilizou com energia de ligação variando entre -0,29 eV e -0,35 eV e as transferências de carga entre -0,002 e- e +0,036 e-. Já para o nordiazepam interagindo com o grafeno, a energia de ligação se manteve entre -0,23 eV e -0,31 eV e as transferências de carga entre -0,002 e- e +0,069 e-. Para o alprazolam a energia de ligação permaneceu entre -0,19 eV e -0,86 eV e as transferências de carga entre -0,004 e- e +0,041 e-. Para o clobazam a energia de ligação variou entre -0,23 eV e -0,76 eV e as transferências de carga entre -0,005 e- e +0,040 e- e para o clonazepam manteve-se entre -0,52 eV e -0,75 eV e a transferência de carga entre -0,005 e- e +0,070 e-. Para todas as interações observou-se que pode ocorrer transferência de carga do grafeno para o fármaco (indicados pelos valores positivos) ou do fármaco para o grafeno (indicados pelos valores negativos). Ocorreu uma adsorção física para todas as interações do grafeno puro com os fármacos ansiolíticos, com energia de ligação variando entre -0,19 eV e -0,86 eV e uma transferência de carga entre -0,018 e- e +0,070 e-, sendo que, as propriedades eletrônicas dos sistemas não foram alteradas significativamente. Os resultados obtidos para a interação do grafeno com ansiolíticos, são importantes para contribuir com o desenvolvimento de filtros para remoção destes fármacos dos meios aquosos e estações de tratamento de esgotos, já que não há relatos na literatura sobre a interação do grafeno com agentes ansiolíticos por meio de simulação computacional.
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Umaña, José Luis. "Lecture sémiologique d'une œuvre d'art : la Sieste de Joan Miro." Master's thesis, Université Laval, 1992. http://hdl.handle.net/20.500.11794/33436.

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Nous avons analysé le tableau "La Sieste" de Joan Miré à partir de la sémiologie visuelle proposée par Fernande Saint-Martin. Cette analyse est divisée en deux parties: l'une correspond à l'analyse colorématique et l'autre à l'analyse syntaxique. Pour la première étape, nous avons élaboré une grille de 20 cases appliquée à l'œuvre, qui nous a servi à réaliser les différentes études sur les rélations qui s'établissent entre les colorâmes. En ce qui concerne la deuxième étape, nous avons segmenté l'œuvre en dix régions et ajouté des sous-régions selon le besoin de l'analyse. Celles-ci ont été étudiées par rapport à la couleur, la dimension, la texture, la vectorialité, l'implantation dans le plan et les frontières. Ce sont les notions sur les rapports topologiques, les lois gestaltiennes, les lois des interactions des couleurs et les différentes modalités perspectivistes qui nous ont aidé à étudier l'œuvre.
Montréal Trigonix inc. 2018
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Souhabi, Jihane. "Réexamen du comportement vibrationnel des alliages modèles GaAs(1-x)Px et Si(1-x)Gex : modèle de percolation et calculs ab initio." Thesis, Metz, 2010. http://www.theses.fr/2010METZ025S/document.

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Le schéma générique de percolation 1-liaison→2-TO mis au point sur site pour la compréhension de base des spectres de vibration (Raman et infrarouge - IR) des alliages semiconducteurs aléatoires usuels, i.e., s’inscrivant dans la structure zincblende, qui a récemment supplanté le modèle standard 1-liaison→1-TO dit MREI [modified-random-element-isodisplacement, (Chang, et al., 1971)] mis au point dans les années soixante, est ici confronté au modèle à clusters (Verleur, et al., 1966), consacré par l’usage pour la discus-sion des spectres de vibration de ces alliages zincblende particuliers, présumés non aléatoires, qui montrent évidemment plus d’un mode phonon par liaison dans leur spectres de vibration. En fait, nous montrons que les spectres de réflectivité IR pionniers de l’alliage GaAs1-xPx représenta-tif de cette dernière classe de comportement, i.e. ceux-là mêmes qui ont motivé le développement du modèle à clusters dans les années soixante, trouvent une explication naturelle dans le cadre du modèle de percolation sur la base d’une substitution As ↔ P parfaitement aléatoire, sans aucun paramètre ajustable. L’alliage GaAs1-xPx et ses semblables se trouvent ainsi réhabilités en tant que systèmes aléatoires vis-à-vis de leurs propriétés vibrationnelles. Du même coup, la classification admise des spectres de vibration des alliages semiconducteurs à structure zincblende, basée sur les modèles MREI-Clusters, en quatre sous-types distincts, se trouve totalement unifiée dans le cadre de notre modèle de percolation. Dans un second temps nous explorons dans quelle mesure une extension du schéma de percolation de la structure zincblende vers la structure diamant, peut aider à comprendre la nature mystérieuse du comportement Raman de l’alliage aléatoire représentatif Si1-xGex. Il s’avère qu’une simulation satisfaisante des spectres Raman de Si1-xGex d’ores et déjà existants dans la littérature peut être accomplie, sans autre para-mètre ajustable que l’efficacité Raman de la liaison mixte Si-Ge, dans le cadre d’une version générique 1-liaison→N-mode du schéma de percolation, où N indique une sensibilité à l’environnement local des liaisons Ge-Ge (N=1, insensibilité), Si-Si (N=2, sensibilité à l’environnement premiers-voisins) et Si-Ge (N=3, sen-sibilité à l’environnement seconds-voisins). Des différences notables entre les schémas de percolation de GaAs1-xPx et de Si1-xGex sont attribuées à la différence de nature de la relaxation du réseau dans les cristaux à structure zincblende et diamant (inversion de l’ordre des branches au sein du triplet Si-Ge) et à la dispersion spectaculaire des modes Ge-Ge (antiparallélisme de la branche unique Ge-Ge) et Si-Si (inversion de l’ordre des branches au sein du doublet Si-Si), qui vient s’ajouter à l’effet de contrainte locale, habituellement seul pris en compte pour les alliages zincblende déjà examinés. L’assignation des branches phonons individuelles au sein de chaque schéma de percolation, i.e. GaAs1-xPx ou Si1-xGex, est réalisé par voie ab initio en se focalisant sur les modes de vibration des liaisons en stretching pur le long de motifs d’impuretés prototypes choisis quasi-linéaires de manière à rester dans l’esprit de l’approximation de la chaîne linéaire (ACL) sur laquelle est basé le modèle phénoménologique de percolation
The 1-bond → 2-TO percolation generic scheme proposed for the basic understanding of the vibra-tion spectra (Raman and Infrared –IR) of usual random semiconductor alloys with zincblende structure, which has recently challenged the standard MREI (modified-random-element-isodisplacement) model with the 1-bond→1-TO behavior, (Chang et Mitra, 1971) developped in the sixties, is here confronted to the cluster model (Verleur et Barker, 1966) which has been accepted through use for the study of the vibration spectra of these particular zincblende alloys, which obviously exhibit more than one phonon mode per bond in their vibration spectra. In fact, the IR reflectivity spectra of GaAs1-xPx, the representative alloy of the last class, i.e. those very ones which motivated the developpement of the cluster model in the sixties, find a natural explanation in the scope of the percolation model on the basis of a perfect random substitution As ↔ P, with no adjusta-ble parameter. With this, GaAs1-xPx and its like are rehabilitated as random alloys in principle, and further, the percolation paradigm generalizes to all types and subtypes of the traditional four-type classification of phonon mode behavior of semiconductor alloys, based on the MREI and cluster models. In a second stage, we investigate to which extent an extension of the percolation scheme to the di-amond structure may help to understand the mysterious nature of the Raman behavior of the representative Si1-xGex alloy. We realize that a good simulation of the Si1-xGex Raman spectra already existing in the literature can be obtained with no adjustable parameter but the Raman efficiency of the Si1-xGex bond within a generic 1-bond→N-TO version of the percolation model, where N indicates a sensitivity to the local environment of the Ge-Ge (N=1 non sensitive), Si-Si (N=2, sensitive to the first neighbor environment) and Si-Ge (N=3, sensitive to the second neighbor environment) bonds. Some differences between the GaAs1-xPx and Si1-xGex percolation patterns are attributed to the different natures of the lattice relaxation in the zincblende and di-amond structures (inversion of the order of like branches in the Si-Ge triplet) and to the spectacular disper-sion of the Ge-Ge like modes (anti parallelism of the unique Ge-Ge branch) and Si-Si (inversion of the order of like branches in the Si-Si doublet), which add to the local constraint effect, the only one usually taken into account in the zincblende alloys examined so far. The assignment of the individual phonons branches in each percolation scheme, i.e. GaAs1-xPx or Si1-xGex, is achieved via home-made ab initio phonon calculations with a focusing on bond-stretching along prototype impurity motives designed as quasi linear so as to be remain in with the spirit of the linear chain approximation on which the percolation model is based
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Wiese, Abigail. "‘Ag sjeim, siestog, sorry’: Tracing shame’s affect through performance in post-apartheid South Africa." University of Western Cape, 2021. http://hdl.handle.net/11394/8420.

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Philosophiae Doctor - PhD
In this study I investigate what performance as a medium can contribute to our understanding of shame's affect. Given the difficulty of defining and concretising affect according to set parameters and outcomes, critical and dynamic debates about its nature continue. Most recently, New Affect theorists such as Brian Massumi have explored the role of the body in affective meaning-making. Our current social context requires a critical engagement with the forms of affect in order to achieve a deeper understanding of the intangible structures of power and oppression, as well as of desire, interest and pleasure. My aim is to determine the ways in which performance – as a medium through which to navigate an often difficult, evasive and deeply subjective experience – can facilitate a knowledge of how bodies experience, relate to and process shame.
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Vendrame, Laura Fernanda Osmari. "ESTUDO TEÓRICO DE FULERENOS FUNCIONALIZADOS INTERAGINDO COM TEMOZOLAMIDA." Centro Universitário Franciscano, 2015. http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/541.

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The use of C60 fullerenes, functionalized or in pristine form, as chemical and biological sensors has become a large field of study and application High stability and low chemical reactivity of these nanostructures provide some difficulties in studying the chemical and physical properties. These difficulties can be overcome through the functionalization process. The purpose of this work is to evaluate through abs initio calculations the structural and electronic properties of the temozolamide molecule interacting with functionalized fullerenes. This drug is very important for the treatment of brain tumors. This study is based on the density functional theory, using the SIESTA computational code. First of all, it was evaluated the isolated functionalized fullerenes behavior, as well as the temozolamide molecule. Subsequently, it was studied the interaction of functionalized fullerenes with temozolamide in order to understand the energetic and structural properties of these structures to support the use of these nanomaterials in future biomedical applications. From the results it is possible to observe the depending on the studied configuration, the binding energy values are not the same. It was found a weak interaction for all functionalized C60 interacting with temozolamide through physical adsorption, with values between 0.43 eV and 1.02 eV for all stable configurations. An interaction through physical adsorption was also observed for themozolamide with pristine fullerenes, with energy value of 0.23 eV. Despite some high energy values, the distance in the interaction between the nearest atoms of the nanostructure and temozolomide does not represent chemical bonds. The interaction of the temozolamide drug with fullerenes is important for the future development of central nervous system nanodrugs improving the performance and slowing the elimination of the drug by the body.
O uso de fulerenos C60, funcionalizados ou na forma pura, como carreadores de fármacos tem se tornado um grande campo de estudo e aplicação. A alta estabilidade e baixa reatividade química destas nanoestruturas trazem algumas dificuldades de manipulação no estudo de suas propriedades químicas e físicas. Estas dificuldades podem ser superadas através do processo de funcionalização. O objetivo deste trabalho é avaliar, por meio de cálculos ab initio as propriedades estruturais e eletrônicas da molécula de temozolamida interagindo com fulerenos puros e funcionalizados. A temozolamida é um medicamento muito importante no tratamento de tumores cerebrais. Este estudo é baseado na teoria do funcional da densidade, utilizando o código computacional SIESTA. Primeiramente, estudamos os fulerenos funcionalizados isolados, bem como a molécula de temozolamida. Posteriormente, estudamos a interação do fulereno puro e funcionalizado, com a temozolamida a fim de compreender suas propriedades energéticas e estruturais. A partir dos resultados é possível observar que, dependendo da configuração estudada, os valores de energia de ligação não são os mesmos. Obtivemos uma interação fraca para todos os C60 funcionalizados interagindo com a temozolamida via adsorção física, com valores entre 0,43 eV e 1,02 eV para as configurações mais estáveis. Uma interação via adsorção física tambem foi observada para a interação da temozolamida com fulerenos puros, com energia de 0,23 eV Apesar de alguns valores altos de energia, a distância na interação entre os átomos mais próximos entre a nanoestrutura e a temozolamida e a baixa transferência de carga, não representam características de ligações covalentes. A interação da temozolamida com fulerenos, através da funcionalização, neste estudo, é importante para contribuir com o futuro desenvolvimento de nanomedicamentos do sistema nervoso central melhorando o desempenho e reatardando a eliminação do medicamento pelo organismo.
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Books on the topic "SIESTSA"

1

Siesta. New York, N.Y., U.S.A: Penguin Books, 1987.

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Guy, Ginger Foglesong. Siesta. New York: Scholastic, 2005.

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ill, Moreno Rene King, ed. Siesta. New York: Greenwillow Books, 2005.

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Fleming, Berry. Siesta. Sag Harbor, NY: Second Chance Press, 1987.

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Chaplin, Patrice. Siesta. Harmondsworth: Penguin, 1988.

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Vázquez, Débora. Siesta nómade. Rosario: Beatriz Viterbo Editora, 2006.

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Nanclares, Silvia. La siesta. Madrid: Kókinos, 2000.

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Noormets, Andres. Siesta oktoobris. [Viljandi: Trükikoda "Kiir"], 1992.

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Bilý, Peter. Posledná siesta milencov. Bratislava: Slovenský spisovateľ, 2006.

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Mena, Pato. The perfect siesta. Madrid, Spain: NubeOcho Ediciones, 2017.

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Book chapters on the topic "SIESTSA"

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Ford, Michael J. "SIESTA: Properties and Applications." In Computational Methods for Large Systems, 367–95. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470930779.ch11.

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de Castro Lozano, Carlos, Javier Burón Fernández, Beatriz Sainz de Abajo, and Enrique García Salcines. "SIeSTA Project: Products and Results." In Advances in New Technologies, Interactive Interfaces, and Communicability, 171–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20810-2_18.

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Vachaspati, Pranjal, and Tandy Warnow. "Enhancing Searches for Optimal Trees Using SIESTA." In Comparative Genomics, 232–55. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67979-2_13.

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de Castro Lozano, Carlos, Enrique García Salcines, Beatriz Sainz de Abajo, F. Javier Burón Fernández, José Miguel Ramírez, José Gabriel Zato Recellado, Rafael Sanchez Montoya, John Bell, and Francisco Alcantud Marin. "SIeSTA: From Concept Board to Concept Desktop." In Human-Computer Interaction, Tourism and Cultural Heritage, 173–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18348-5_16.

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de Castro, C., E. García, J. M. Rámirez, F. J. Burón, B. Sainz, R. Sánchez, R. M. Robles, J. C. Torres, J. Bell, and F. Alcantud. "SIeSTA: Aid Technology and e-Service Integrated System." In Advances in New Technologies, Interactive Interfaces, and Communicability, 159–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20810-2_17.

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Artacho, Emilio, Julian D. Gale, Alberto García, Javier Junquera, Richard M. Martin, Pablo Ordejón, Daniel Sánchez-Portal, and José M. Soler. "Electronic Structure Calculations with Localized Orbitals: The Siesta Method." In Handbook of Materials Modeling, 77–91. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/978-1-4020-3286-8_6.

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Gale, Julian D. "SIESTA: A Linear-Scaling Method for Density Functional Calculations." In Computational Methods for Large Systems, 45–75. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470930779.ch2.

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Artacho, Emilio, Julian D. Gale, Alberto García, Javier Junquera, Richard M. Martin, Pablo Ordejón, Daniel Sánchez-Portal, and José M. Soler. "Electronic Structure Calculations with Localized Orbitals: The Siesta Method." In Handbook of Materials Modeling, 77–91. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3286-2_6.

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Ordejón, Pablo. "Linear Scaling ab initio Calculations in Nanoscale Materials with SIESTA." In Computer Simulation of Materials at Atomic Level, 335–56. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527603107.ch15.

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Gassmann, F., and D. Bürki. "Experimental Investigation of Atmospheric Dispersion over the Swiss Plain—Experiment “Siesta”." In Interactions between Energy Transformations and Atmospheric Phenomena. A Survey of Recent Research, 295–307. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1911-7_20.

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Conference papers on the topic "SIESTSA"

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Penzel, T., M. Glos, C. Garcia, C. Schoebel, and I. Fietze. "The SIESTA database and the SIESTA sleep analyzer." In 2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2011. http://dx.doi.org/10.1109/iembs.2011.6092052.

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Jusela, Daniel R., and Kaveh Khalili. "Superior Idle Elimination System for Truck Air-conditioning (SIESTA)." In SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-0216.

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"HEART RATE VARIABILITY IN SIESTA POLYSOMNOGRAMS - A Preliminary Study." In International Conference on Bio-inspired Systems and Signal Processing. SciTePress - Science and and Technology Publications, 2012. http://dx.doi.org/10.5220/0003735703340337.

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Baldo, D., G. Benelli, and A. Pozzebon. "The SIESTA project: Near Field Communication based applications for tourism." In 2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010). IEEE, 2010. http://dx.doi.org/10.1109/csndsp16145.2010.5580332.

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Passerino, Liliana Maria, Maria Rosangela Bez, João Carlos Gluz, Enrique Garcia, J. Miguel Ramirez, and Carlos De Castro. "SCALA e Siesta Cloud: uma integração para aplicações homeschooling visando a inclusão." In XXIV Simpósio Brasileiro de Informática na Educação. Sociedade Brasileira de Computação, 2013. http://dx.doi.org/10.5753/cbie.sbie.2013.961.

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Shin, Sunae, Baek-Young Choi, and Sejun Song. "Siesta: Software-Defined Energy Efficient Base Station Control for Green Cellular Networks." In 2015 24th International Conference on Computer Communication and Networks (ICCCN). IEEE, 2015. http://dx.doi.org/10.1109/icccn.2015.7288466.

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Kaushal, Ashok K., Jagdish Kumar, P. K. Ahluwalia, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Dimer Induced Reconstruction and Metallicity of Ge(001) Surface: Ab-initio SIESTA Study." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606015.

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Bain, Aaron, Ethan Languri, Venkat Padmanabhan, Jim Davidson, and David Kerns. "Thermal Conductance of Nanoparticles: A Study of Phonon Transport in Functionalized Nanodiamond Suspensions." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24384.

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Abstract Nanoparticle additives, with their anomalous thermal conductivity, have attracted attention in research and industry as a novel mode of enhancing the heat transfer mediums. Most studies conducted on nanoparticle suspensions in liquids, pastes, or composites at present have relied on constitutive relations using properties of the bulk substance and of the nanoparticle to explain the effective thermal conductivity. In order to utilize nanoparticles in real world engineering applications, chemical functionalization of the surface of the nanoparticle is frequently employed, either to suspend in liquid applications or to stabilize in arrays. In this study, we have sought to explain the underlying mechanisms of thermal conductivity enhancement taking into consideration the nanoscale effects, such as phonon transport in the nanoparticle coupled with vibrational modes of the surface functional molecules, in order to tailor the functional groups not only for suspension stability but also for minimizing Kapitza resistance at the surface of the nanoparticle. Density functional theory simulations in SIESTA and equilibrium transport theory analysis via GOLLUM2 were used in tandem to evaluate the thermal transport at the nanoparticle to surface ligand junction. By treating the nanoparticle surface and the polymer or acid coating as distinct homogeneous substrates, a model for thermal conductivity becomes more tractable.
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Zhang, Qinqiang, Meng Yang, Ken Suzuki, and Hideo Miura. "Highly Sensitive Strain Sensor Using Dumbbell-Shape Graphene Nanoribbon." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70318.

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A nano-scale strip of graphene is known as graphene nano-ribbon (GNR). Previous studies have shown that the armchair-type GNR (aGNR) can open the electronic band gap at room temperature, and the band gap increases monotonically with the decrease in the width of aGNR. The critical width at which aGNR shows semi-conductive characteristics at room temperature is about 70 nm, when it is passivated by hydrogen on both sides. However, the electronic band structure varies frequently as a function of the number of carbon atoms along its width direction. In order to decrease the large variation of the band gap of aGNR to control the electronic properties of GNR for highly sensitive sensors and high performance devices, the electronic band structure of various dumbbell-shape structure of aGNR was analyzed by first-principles calculations based on the density functional theory using implemented in SIESTA package. It was shown that the width of aGNR had a large effect on the electronic band structure and the amplitude of the fluctuation of the band gap as a function of the number of carbon atoms decreased drastically. The electronic band structure of various GNRs under the application of uniaxial strain was also analyzed by using the first-principles calculations, in this study. It was confirmed that the effective band gap of aGNR thinner than 70 nm varies drastically under the application of uniaxial strain, and this result clearly indicates the possibility of a highly sensitive strain sensor using dumbbell-shape GNR structures.
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Reports on the topic "SIESTSA"

1

Apblett, Christopher, Josefine McBrayer, Eric Allcorn, and Kyle Fenton. EERE SIESta FY19 Q2 Report. Office of Scientific and Technical Information (OSTI), April 2019. http://dx.doi.org/10.2172/1762082.

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Apblett, Christopher, and Jaclyn Coyle. SIESta deep dive Annual Report from Sandia National Laboratories. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1733281.

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