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Search Results: 1 - 10 of 232171 matches for " Gustavo R. "
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Effect of Trisodium Citrate on the Properties of Electrodeposited Cu2ZnSnS4 (CZTS) Layers on ZnS Thin Films Using a 2-Electrode Method  [PDF]
Gustavo A. Silva Hernandez, Ajith R. Weerasinghe
Advances in Materials Physics and Chemistry (AMPC) , 2018, DOI: 10.4236/ampc.2018.88021
Abstract: Electrodeposition of CZTS thin films on ZnS was carried using a 2-electrode method to fabricate superstrate structure solar cells. A comprehensive study was performed on the effects of trisodium citrate on the CZTS electrolyte bath. In the present investigation, it is demonstrated that using a CZTS electrolyte with a concentration of 0.2 M trisodium citrate yields CZTS thin films with an electronic bandgap of 1.52 eV, a p-type nature, and good uniformity, which are all results desired for the fabrication of thin film solar cells. Characterization was performed using UV-Vi-IR optical absorption, SEM imaging, Raman spectrometry, and photoelectrochemical cells conducted for electronic bandgap, morphology, chemical composition, and semiconductor conductivity, respectively.
Extravasación urinaria postraumatismo abdominal cerrado. ?Es posible un diagnóstico precoz?: Informe de dos casos
Marín,Gustavo R.;
Archivos argentinos de pediatr?-a , 2010,
Abstract: an injury to the upper urinary tract with urinary extravasation caused by blunt abdominal trauma is uncommon and often unrecognized in an initial evaluation. a late diagnosis of this injury significantly increases morbidity. two cases are discussed, one with avulsion of right upper ureter and the other one with parenchymal and right renal pelvis laceration with delayed diagnosis and severe complications subsequent to a direct blunt abdominal trauma. knowledge of the mechanism of trauma and the assessment of local signs and symptoms are important data for suspecting ureteropelvic injury regardless of the trauma severity. the absence of initial hematuria is not uncommon and their presence and degree is unrelated to the severity of the injury. an abdominal computed tomography with iv contrast evaluated in delayed excretory phase allows an early detection of extravasation of urine.
Cuatro especies nuevas de anuros (Bufonidae: Bufo e Hilydae: Hyla) del norte de la Argentina
Carrizo, Gustavo R.
Cuadernos de Herpetología , 1992,
Abstract: Se realizó una revisión de las especies del género Bufo de las selvas de altura del noroeste argentino. Como resultado se describen dos nuevas especies del grupo veraguensis-typhonius, y se invalida la cita de Bufo quechua Gallardo, 1961 para el país. Mediante métodos radiológicos se confirma la relación de B. gnustae Gallardo, 1967 con el mismo grupo. Se describen dos especies nuevas del género Hyla, del norte de Argentina. A revision of mountain Forest species of Bufo, from the North-western Argentina was made. As a result, two new species from the veraguensis-typhonius group are described. The previous report of Bufo quechua Gallardo, 1961 for Argentina is invalidated. By means of radiology methods, the relationship between B. gnustae Gallardo, 1967 and ibis group is confirmed. Two new species of genus Hyla, from the northern Argentina are described.
Sobre los hílidos de Misiones, Argentina, con la descripción de una nueva especie, Hyla caingua n. sp. (Anura, Hylidae)
Carrizo, Gustavo R.
Cuadernos de Herpetología , 1990,
Abstract:
Proposal and Phylogenetic Relationships of Lapsamita, a New Genus of Lapsiines, and Description of a New Species (Araneae, Salticidae)
Gustavo R. S. Ruiz
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0056188
Abstract: Lapsamita maddisoni gen. et sp. nov. is described from Bahia, Brazil. The presence of palpal claws in females, long ventral spines on front tibiae and metatarsi and long retrolateral tibial apophyses in male palps suggested that the species was closely related to or even nested within Soesiladeepakius Makhan, 2007. To evaluate its phylogenetic position, a cladistic analysis was carried out using a data matrix comprising 24 morphological characters, scored for 13 taxa. The analysis showed L. maddisoni as the sister group of Soesiladeepakius, supporting the proposal of the new genus. Character evolution is discussed and compared to a previous study on the group.
Saul Kripke y la paradoja de Wittgenstein: un ensayo de crítica del escepticismo
Martín F.,Gustavo R.;
EPISTEME , 2006,
Abstract: saul kripke en su libro wittgenstein. on rules and private language (1982) presenta la denominada "paradoja de wittgenstein", también conocida como "paradoja del escéptico", la cual podría ser resumida de la siguiente manera: ?quién o qué garantiza, si no existe el lenguaje privado, que el seguimiento de una regla se mantendrá constante en el tiempo, especialmente en términos de los resultados obtenidos por su aplicación, cuando cada vez que sigo una regla tomo un curso de acción específico? los esfuerzos desplegados por kripke para intentar buscar una solución a esta paradoja se estrellan debido, y este es mi principal argumento en el presente trabajo, a que él hace uso de un "juego de lenguaje" diferente al empleado por wittgenstein, por lo que le otorga un significado diferente a los términos disposicionales.
Arteriosclerosis and the promise of GPIIb/IIIa inhibitors in stroke
SAPOSNIK, GUSTAVO;CAPLAN, LOUIS R;
Arquivos de Neuro-Psiquiatria , 2000, DOI: 10.1590/S0004-282X2000000100001
Abstract: ischemic mechanisms in patients with brain and heart attacks have been studied for more than 150 years. antiplatelets agents did show benefit in secondary prevention. aspirin is the most common antiaggregant in clinical use today. however, the benefit produced by the "best" antiplatelet regimen in stroke prevention is lower than 40%. the adherence of circulating platelets to the subendothelium is mediated by glycoprotein (gp) residing on the cell's surface. gpiib/iiia is the most important platelet membrane receptor that mediates the process of platelet aggregation, and thrombus formation. thus, new drugs that block the gpiib/iiia receptor have recently emerged. clinical trials using these agents have shown effectiveness in acute coronary syndromes. however, the absence of studies in cerebrovascular disease and the potential hemorrhagic complications questioned their use in stroke prevention. we review the clinical trials using the new gpiib/iiia agents in myocardial ischemia, and consider the potential implications for cerebrovascular disease.
Sedación en anestesia neuroaxial
Navarro,José R; Duarte,Gustavo;
Revista Cubana de Anestesiolog?-a y Reanimaci?3n , 2012,
Abstract: introduction. sedation observed in patients with regional anesthesia for cesarean section is a phenomenon not yet clear. in studies that attempt to answer this question, has been found that these patients have low requirements for intravenous hypnotic and inhaled agents. objective: to this review it is proposed that the sedation is a side effect to the action of endogenous opioids under the influence of descending inhibitory pathways. methods. was searched pubmed with the following mesh terms: conscious sedation, deep sedation, spinal and epidural anesthesia.was performed a manual search of reviews of regional anesthesia and the snowball technique, was found items related to sedation and regional anesthesia. articles were reviewed and were confronted with conflicting theories proposed hypothesis. results. were obtained and evaluated 10 articles related to the effects of neuraxial anesthesia sedation. it found that although no specific mechanism is known, however, there is an association between the level of blockade, a mechanism of "down regulation" in the activation of brain stem, and the effect of inhibitory descending pathways in the onset of these effects. conclusions. previously described a causal relationship between inhibition of somatosensory afferents and decreased alertness, measured by auditory evoked potential level. it is proposed an additional mechanism to explain this phenomenon: the predominant action of descending inhibitory system.
A new species and new records of Paryphoconus from the Amazon region of Peru (Diptera: Ceratopogonidae)
Mauad, Melina;Spinelli, Gustavo R.;
Revista mexicana de biodiversidad , 2011,
Abstract: paryphoconus peruvianus, a new species from peruvian amazonia is described and illustrated from female and male specimens collected at light in the department of cuzco. the species is compared with its similar congener p. anomalicornis kieffer. furthermore, p. anomalicornis, p. fusciradialis spinelli y wirth and p. oliveirai lane are firstly recorded from peru.
Actividades y creación de valor. Resultados de un estudio en peque as y medianas empresas regionales
Cecilia R. Ficco,Gustavo Sader
Gestión Joven , 2011,
Abstract: La creación de valor constituye hoy el objetivo central de las empresas, objetivo que no sólo se logra a través de producción, como lo consideraban los economistas clásicos, sino que se encuentra estrechamente asociado con aquellos procesos que resultan claves para sus sostenibilidad, como son los de organización de las actividades productivas y la innovación empresarial. La presente investigación tiene como objetivo estudiar la importancia que tienen las actividades de producción, de organización y de innovación para la generación de valor en empresas locales y regionales y su relación con distintos aspectos que definen características específicas de las mismas. Para ello se realiza un estudio empírico sobre una muestra de empresas de la Región Río Cuarto (Argentina) aplicando métodos estadísticos multivariados. Los resultados muestran una clara diferenciación entre las empresas que priorizan la creación de valor a través de la producción de las que lo hacen por medio de la organización y la innovación, aunque esta diferenciación no guarda relación directa con el tama o de las empresas ni con su antigüedad.
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