58 research outputs found
Improved design of a DFB Raman fibre laser
A Raman fibre laser based on phase shifted DFB structures is modelled for the first time. Using parameters of realistic devices, the model predicts low-threshold and highly-efficient laser output. The change of position and width of the phase shift were found to have a substantial impact on laser performanc
Statistical Models for Predicting College Success
Colleges base their admission decisions on a number of factors to determine which applicants have the potential to succeed. This study utilized data for students that graduated from Florida International University between 2006 and 2012. Two models were developed (one using SAT as the principal explanatory variable and the other using ACT as the principal explanatory variable) to predict college success, measured using the student’s college grade point average at graduation. Some of the other factors that were used to make these predictions were high school performance, socioeconomic status, major, gender, and ethnicity. The model using ACT had a higher R^2 but the model using SAT had a lower mean square error. African Americans had a significantly lower college grade point average than graduates of other ethnicities. Females had a significantly higher college grade point average than males
Temporal and Spatial Nutrient Trends of the Lower Boise River, Southwest Idaho
Elevated nutrients, orthophosphate and nitrate, in the Lower Boise River (LBR) in southwest Idaho may be attributed to contamination from agriculture runoff draining into tributaries and/or waste water treatment plants (WWTP). To better understand the sources and associated spatial and temporal dynamics of nutrient loading to the LBR, a series of high resolution synoptic sampling events were conducted. Six separate synoptic sampling events were conducted along approximately 65 miles, from upstream near the city of Boise to the confluence with the Snake River, seasonally from July 2012 to October 2013 with a sampling increment of approximately 0.5 miles. The samples were then analyzed for the anions chloride, nitrate, orthophosphate, and sulfate. The resulting dataset shows overall trends of increasing concentrations for all anions with distance downstream, with chloride increasing an average of 17.2 mg L-1, nitrate by 3.5 mg L-1, orthophosphate by 0.15 mg L-1, and sulfate by 33.1 mg L-1. The most dramatic increases in nutrient concentrations are observed at WWTP discharges, with the greatest increases at the West Boise WWTP (Mile 17.1) with average increases of 0.32 mg L-1 for orthophosphate and 1.8 mg L-1 for nitrate, and the Caldwell plant (Mile 41.4) with average increases of 0.05 mg L-1 for orthophosphate and 1.7 mg L-1 for nitrate. Importantly, there was little evidence of significant increases in nutrient concentrations from any of the major tributaries not associated with WWTPs
La aplicaciĂłn de la ley nÂş30364 y la protecciĂłn de la vĂctima de violencia familiar, en los procesos seguidos en la corte superior de justicia de Huánuco, 2020
El objetivo general de la presente tesis es describir la manera que el proceso especial de tutela de acuerdo a la aplicaciĂłn de la Ley N° 30364 se relaciona con la protecciĂłn a las vĂctimas de violencia familiar en los procesos seguidos en la Corte Superior de Justicia de Huánuco, 2020; para el desarrollo de la investigaciĂłn se ha empleado el tipo aplicado con un enfoque cuantitativo; además el nivel es el descriptivo correlacional con un diseño no experimental; la poblaciĂłn ha consistido en las vĂctimas de violaciĂłn familiar, (violencia contra la mujer e integrantes del grupo familiar), que tienen trámite ante los Juzgados de Familia de la Corte Superior de Justicia de Huánuco, correspondiente al año 2020; la obtenciĂłn de la muestra fue no probabilĂstica, para tal efecto se contĂł con el 10.0% de la poblaciĂłn que correspondiĂł a 32 personas.
A partir de los resultados obtenidos, mediante es programa estadĂstico SPSS, se rechazĂł la hipĂłtesis nula y se acepta la hipĂłtesis general: El proceso especial de tutela de acuerdo a la aplicaciĂłn de la Ley N° 30364 se relaciona de manera negativa con protecciĂłn a las vĂctimas de violencia familiar en los procesos seguidos en la Corte Superior de Justicia de Huánuco, 2020. Consecuentemente se observa una correlaciĂłn positiva alta con un “r” = 0,920, lo cual nos permite aseverar que, la aplicaciĂłn del proceso especial de tutela de acuerdo a los establecido en la Ley N 30364, destinado a dictar medidas de protecciĂłn y cautelares, para evitar la continuidad del riesgo y vulnerabilidad en los casos de violencia familiar, (contra la mujer e integrantes del grupo familiar), no son eficaces, porque Ă©stas se encuentran desprotegidas
A 100 mW monolithic Yb waveguide laser fabricated using the femtosecond laser direct-write technique
A femtosecond laser-written monolithic waveguide laser (WGL) oscillator based
on a distributed feedback (DFB) architecture and fabricated in ytterbium doped
phosphate glass is reported. The device lased at 1033 nm with an output power
of 102 mW and a bandwidth less than 2 pm when bidirectionally pumped at 976 nm.
The WGL device was stable and operated for 50 hours without degradation. This
demonstration of a high performance WGL opens the possibility for creating a
variety of narrow-linewidth laser designs in bulk glasses.Comment: 5 pages, 3 figures, submitted journal manuscrip
Prédiction de défauts dans les arbres du parc végétal Grenoblois et préconisations pour les futures plantations
National audienceNous décrivons dans cet article notre réponse au défi EGC 2017. Une analyse exploratoire des données a tout d’abord permis de comprendre les distributions des différentes variables et de détecter de fortes corrélations. Nous avons défini deux variables supplémentaires à partir des variables du jeu de données. Plusieurs algorithmes de classification supervisée ont été expérimentés pour répondre à la tâche numéro 1 du défi. Les performances ont été évaluées par validation croisée. Cela nous a permis de sélectionner les meilleurs classifieurs uni-label et multi-label. Autant sur la tâche uni-label que multi-label, le meilleur classifieur dépasse les références d’environ 2%. Nous avons également exploré la tâche numéro 2 du défi. D’une part, des règles d’association ont été recherchées. D’autre part, le jeu de données a été enrichi avec des connaissances telles que des données climatiques (pluviométrie, température, vent) ou des données taxonomiques dans le domaine de la botanique (famille, ordre, super-ordre). En outre, des données géographiques et cartographiques sont exploitées dans un outil de visualisation d’une partie des données sur les arbres
Bloqueo epidural cervicotorácico con catĂ©ter para hemitiroidectomĂa. A propĂłsito de un caso.
In recent times, cervical epidural anesthesia has gained popularity; however, few anesthesiologists practice this technique. It is performed in the neck region, between the C5-T1 vertebral spaces. It is effective as an anesthetic for surgical procedures on the neck, breasts, shoulders and upper limbs. It maintains coronary perfusion pressure, which is why it is considered cardioprotective, being considered a safe anesthetic technique.En los Ăşltimos tiempos la anestesia epidural cervical ha tomado auge; sin embargo, son pocos los anestesiĂłlogos que practican esta tĂ©cnica. Se realiza en la regiĂłn del cuello, entre los espacios vertebrales C5-T1. Es eficaz como anestĂ©sico para procederes quirĂşrgicos de cuello, mamas, hombro y miembros superiores. Mantiene la presiĂłn de perfusiĂłn coronaria por lo que se considera cardioprotectora, considerándose una tĂ©cnica anestĂ©sica segura. 
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