914 research outputs found
Estimating panel data duration models with censored data
No full textThis paper presents a method for estimating a class of panel data duration models, under which an unknown transformation of the duration variable is linearly related to the observed explanatory variables and the unobserved heterogeneity (or frailty) with completely known error distributions. This class of duration models includes a panel data proportional hazards model with fixed effects. The proposed estimator is shown to be n1/2-consistent and asymptotically normal with dependent right censoring. The paper provides some discussions on extending the estimator to the cases of longer panels and multiple states. Some Monte Carlo studies are carried out to illustrate the finite-sample performance of the new estimator
Revised diagnostic criteria for Vogt-Koyanagi-Harada disease: report of an international committee on nomenclature
No full textOn some properties of singular matrices
No full textAbstractSome results of Ostrowski in [5] are generalized to the case of monotonic norms
Dissolved organic matter and metabolic dynamics in dryland lowland rivers
No full textDissolved organic matter (DOM) within freshwaters is essential for broad ecosystem function. The concentration and type of DOM within rivers depends on the relative contributions of allochthonous sources and the production and consumption of DOM by microbes. In this work we have examined the temporal patterns in DOM quality and productivity in three lowland rivers in dryland Australia using fluorescence excitation emission scans. We assessed the production and consumption of DOM within light and dark bottle assays to quantify the relative contribution of bacteria and algae to the DOM pool and simultaneously assessed whether the systems were autotrophic or heterotrophic. DOM varied temporally within the three river systems over the course of the study period. Characterisation of DOM within light and dark bottles following a 6-hour incubation revealed microbial consumption of a humic-like component and production of protein-like components similar in nature to the amino acids tryptophan and tyrosine. The lack of a significant difference in DOM quality between the light and dark bottles indicated that the protein-like DOM is likely derived from bacterial activity. Respiration was shown to be higher than gross primary production in both whole river and bottle assays, yielding negative net production values and demonstrating that these rivers were predominately heterotrophic. Our work suggests that bacterial metabolism of DOM may be a significant contributor to the production of protein-like components within heterotrophic freshwater systems.No Full Tex
Surveying the open podcast landscape and finding our niche: Blog #1 for the Open Podcasting Project
No full textblog post#GO--GN Fellowshiphttps://go-gn.net/gogn/the-third-call-for-go-gn/Open educational practices (OEP)Student perspectivesOpen researchpodcast creatio
Introducing the "Into the Open" podcast series
No full textblog post#GO--GN Fellowshiphttps://go-gn.net/gogn/the-third-call-for-go-gn/Open Educational Practices (OEP)Student perspectivesOpen researchPodcast creatio
Small points on subvarieties of a torus
No full textLet V be a subvariety of a torus defined over the algebraic numbers. We give a qualitative and quantitative description of the set of points of V of height bounded by invariants associated to any variety containing V . Especially, we determine whether such a set is or is not dense in V . We then prove that these sets can always be written as the intersection of V with a finite union of translates of tori of which we control the sum of the degrees. As a consequence, we prove a conjecture by the first author and David up to a logarithmic factor
Altura de la rama mandibular y su relación con el ángulo SN GO-GN en radiografías cefálicas laterales digitales
No full textObjetivo: El presente estudio de investigación tiene como objetivo establecer la altura de la rama mandibular y su relación con el ángulo SN Go-Gn en radiografías cefálicas laterales digitales en pacientes de 18 a 45 años de edad de la ciudad de Cuenca-Ecuador. Materiales y Métodos: Este estudio, cuantitativo, observacional con un enfoque correlacional, se realizó en radiografías cefálicas laterales digitalizadas que reposan en el archivo de un centro radiológico de la ciudad de Cuenca - Ecuador e incluyó un total de 388 radiografías laterales escogidas bajo ciertos criterios de inclusión y exclusión. Las variables analizadas fueron altura de la rama mandibular, ángulo SN Go-Gn y sexo. Las medidas se realizaron, aplicando el software AUTOCAD 2018, por un examinador entrenado previamente para tal fin, y validados posteriormente por la autora del estudio. Los datos obtenidos de las diferentes mediciones fueron registrados en una hoja de cálculo Excel. Para evaluar la relación entre la altura de la rama mandibular y el ángulo SN Go-Gn se empleó el coeficiente de correlación r de Pearson, para la interpretación se siguió la sugerencia de Cohen (1988); correlación nula (0.00 ≤ r <0.10), correlación leve (0.10 ≤ r <0.30), correlación moderada (0.30 ≤ r <0.50) y correlación fuerte (0.50 ≤ r < 1). Para la comparación se empleó el estadístico paramétrico t-Student, la significancia considerada fue de 0.01 (p<0.01). El procesamiento de datos fue realizado en el programa estadístico SPSS V27. Resultados: Se encontró una correlación negativa fuerte, entre la altura de la rama mandibular y el ángulo SN Go-Gn (r= -0.535; p<0.001), lo que implica que a mayor altura (mm), menor ángulo (°) Conclusión: Los resultados mostraron que si existe relación entre la altura de la rama mandibular y el ángulo SN Go-Gn, en pacientes de 18 a 45 años de edad.The present research study aims to establish the height of the mandibular ramus and its relationship with the SN Go-Gn angle in digital lateral cephalic radiographs in patients from 18 to 45 years old from the city of Cuenca-Ecuador. Materials and Methods: This study, quantitative, observational with a correlational approach, was carried out on digitalized lateral cephalic radiographs that rest in the archive of a radiological center in the city of Cuenca - Ecuador and included a total of 388 lateral radiographs chosen under certain criteria of inclusion and exclusion. The variables analyzed were mandibular ramus height, SN Go-Gn angle, and sex. The measurements were made, applying the AUTOCAD 2018 software, by an examiner previously trained for this purpose, and subsequently validated by the author of the study. The data obtained from the different measurements were recorded in an Excel spreadsheet. To evaluate the relationship between the height of the mandibular ramus and the SN Go-Gn angle, the Pearson r correlation coefficient was used, for the interpretation the suggestion of Cohen (1988) was followed; null correlation (0.00 ≤ r <0.10), slight correlation (0.10 ≤ r <0.30), moderate correlation (0.30 ≤ r <0.50) and strong correlation (0.50 ≤ r < 1). For the comparison, the parametric t-Student statistic was used, the significance considered was 0.01 (p<0.01). The data processing was carried out in the statistical program SPSS V27. Results: A strong negative correlation was found between the height of the mandibular ramus and the SN Go-Gn angle (r= -0.535; p<0.001), which implies that the higher the height (mm), the lower the angle (°). Conclusion: The results showed that there is a relationship between the height of the mandibular ramus and the SN Go-Gn angle, in patients from 18 to 45 years old.
Key words: mandibular Ramus, mandibular growth0000-0002-3794-1942Especialista en OrtodonciaCuenc
The process of creating a podcast, don't make the same mistakes I did: Blog #2-B for the Open Podcasting Project
No full textblog post#GO--GN Fellowshiphttps://go-gn.net/gogn/the-third-call-for-go-gn/Open educational practices (OEP)Student perspectivesPodcast creatio
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