171,208 research outputs found
Carta de C. de la mula (Santa Marta) a un destinatario desconocido (Diciembre 17 de 1934)
No full textCarta de C. de la mula (Santa Marta) dirigida a un destinatario desconocido con información sobre el funcionamiento un Comité Pro-huelga, cuyos resultados eran deficientes y la forma como mantenía comunicación con los distintos grupos que actuaban en la zona y recibía despachos de Medellín, Puerto Liévano y Barrancabermeja. El remitente subrayaba que esperaba participar en una manifestación el día 18
El tambor en la Semana Santa: tradiciones escondidas
No full textEl tambor, las tamboradas y sus toques en la Región de Murcia constituyen un patrimonio musical reconocido por diversas instituciones nacionales e internacionales. El objetivo principal de este trabajo es identificar las características musicales del uso del tambor en la Semana Santa en lugares donde la tradición es menos conocida. El estudio se basa en entrevistas a sus principales protagonistas, los tamboristas. Se ha centrado en tres pedanías de diversos municipios de la Región, con la intención de visibilizar sus manifestaciones y comparar sus rituales, toques, funciones y motivaciones. Las pedanías son Fuente Librilla, perteneciente al municipio de Mula; Los Valientes, en Molina de Segura y Guadalupe de Maciascoque, perteneciente a la ciudad de Murcia
Atomic-layer epitaxy of GaN quantum wells and quantum dots on (0001) AlN
No full textWe show that a dynamically stable Ga film is formed on (0001) AlN in a large range of Ga fluxes at a substrate temperature of 740 °C. This feature allows for atomic layer epitaxy (ALE) of GaN on
AlN by alternate exposure to Ga and N flux. We show that, at a growth temperature of 740 °C, one ALE cycle leads to the formation of a two-dimensional GaN layer, whereas further cycles lead to the formation of GaN quantum dots following a Stranski–Krastanov growth mode. This behavior
is confirmed by atomic force microscopy, transmission electron microscopy, and
cathodoluminescence
Perceived Self-Control and COVID-19 Protective Behaviors: The Mediational Role of Problem-Focused Coping Strategies.
No full text
Relationship among Sexually Objectifying Work Environments, Job Satisfaction, Anxiety, and Affective Commitment in a Sample of Italian Restaurant Waitresses.
No full textAsymmetric C-C bond formation by the mixed oxidative coupling of 1,1 '-bi-2-naphthyl esters
No full textAsymmetric C-C bond formation was effected by the oxidative coupling of two different ester enolates using (R)-(+)-1,1'-bi(2-naphthol) as a common tether which served to link together both ester moieties in an asymmetric environment. Reduction of the corresponding succinates afforded diastereomerically pure 2,3-disubstituted-1,4-butanediols
Pengaruh Pemanasan Mula terhadap Kekuatan Tarik dan Distribusi Kekerasan pada Pengelasan Baja Tidak Sejenis
No full textPengelasan dua logam yang berbeda dengan dimensi yang tebal memiliki tingkat kesulitan yang cukup tinggi. Mengacu pada kedua material yang memiliki sifak fisik dan metalurgi yang berbeda. Dalam perkembangannya pengelasan dua logam yang tidak sejenis memunculkan banyak persoalan misalnya terhadap sifat mekanik material hasil pengelasan. Temperatur pemanasan mula salah satunya bisa dikatakan mempunyai pengaruh cukup besar terhadap hasil lasan terutama pada kualitas sambungannya. Selain kekuatan tarik, panas yang ditimbulkan selama pengelasan juga berpengaruh pada distribusi kekerasan material setelah dilas. Dalam penelitian ini dapat dipelajari tentang pengaruh diberikannya pemanasan mula terhadap kekuatan tarik dan distribusi kekerasan pada sambungan baja tidak sejenis. Proses pengelasan menggunakan proses GTAW dengan variasi pemberian temperature pemanasan mula: a). Diberikan pemanasan mula sebesar 100°C, b). Diberikan pemanasan mula sebesar 150°C, c). Diberikan pemanasan mula sebesar 200°C, d). Tidak diberikan pemanasan mula. setelah pengelasan dilakukan pengujian tarik dan pengujian kekerasan. Hasil penelitian menunjukkan bahwa temperature pemanasan mula memiliki pengaruh terhadap kekuatan tarik yaitu 537.5 N/mm2 (Tanpa pemanasan mula), 530.83 N/mm2 (T=100°C), 518.33 N/mm2 (T=150°C), 498.33 N/mm2 (T=200°C). Adanya penurunan kekuatan tarik disebabkan laju pendinginan yang lambat sehingga butiran berkembang dan menjadi lunak. Sedangkan pada pengujian kekerasan didapatkan hasil bahwa semakin tinggi temperature pemanasan mula maka kekerasan akan menurun dan distribusi kekerasan dari daerah las sampai logam induk akan semakin merata
Suicidal behavior and antiepileptic drugs in epilepsy: analysis of the emerging evidence
No full textMarco Mula1, Dale C Hesdorffer21Department of Clinical and Experimental Medicine, Amedeo Avogadro University and Division of Neurology, University Hospital Maggiore della Carità, Novara, Italy; 2Gertrude H Sergievsky Center and Department of Epidemiology, Columbia University, New York, NY, USAAbstract: Two years after the warning issued by the Food and Drug Administration on an increased risk of suicide for people taking antiepileptic drugs (AEDs), a number of pharmacoepidemiologic studies have been published but the scientific community is far from definitive answers. The present paper is aimed at reviewing available evidence on the association between AEDs and suicidal behavior, discussing major variables involved such as the relationship between epilepsy, depression, and suicide and the psychotropic potential of AEDs. All studies published so far show a lack of concordance and are constrained by various methodological limitations. What seems to be established is that mood disorders represent a frequent comorbidity in epilepsy and suicide is a serious complication more frequently encountered in epilepsy rather than in the general population. Moreover, a subgroup of patients appears to be at risk of developing treatment-emergent psychiatric adverse effects of AEDs independently of the specific mechanism of action of the drug. The prior history of suicide attempt, especially preceding the onset of the epilepsy, may represent a key element explaining why what is observed is independent of the specific mechanism of the drug. In general terms, risks associated with stopping, or not even starting, AEDs in epilepsy might well be in excess of the risk of suicide in epilepsy, as deaths due to accident and epilepsy itself may predominate. Clinicians need to pay attention not only to seizure patterns when choosing the appropriate AED but also to a number of different parameters (eg, age, gender, working needs, medical comorbidities, history of psychiatric disorders, and suicidality before epilepsy onset) and not the least the mental state of the patient. Missing severe complications such as suicidal behavior or delaying its treatment may worsen the prognosis of epilepsy.Keywords: antiepileptic drugs, suicide, depression, epilepsy, FD
II-VI infrared microcavity emitters with 2 postgrowth dielectric mirrors
No full textWe report on optically pumped resonant cavity emitters and vertical cavity surface-emitting lasers based on epitaxial CdHgTe material. The Fabry–Pérot resonator is constituted by two postgrowth dielectric mirrors. Room temperature emission is observed at 1.57, 2.63 and 3.18 μm. A laser threshold of 6 kW/cm2 at 300 K is obtained for the 1.57 μm emitter
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