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Search Results: 1 - 10 of 462555 matches for " A. Pe a "
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Shifted Appell sequences in Clifford analysis
Dixan Pea Pea
Mathematics , 2011,
Abstract: This paper is a continuation of [D. Pe\~{n}a Pe\~{n}a, On a sequence of monogenic polynomials satisfying the Appell condition whose first term is a non-constant function, arXiv:1102.1833], in which we prove that for every monogenic polynomial $\mathbf{P}_k(x)$ of degree $k$ in $\mathbb R^{m+1}$ there exists a sequence of monogenic polynomials $\{M_n(x)\}_{n\ge0}$ satisfying the Appell condition such that $M_0(x)=\mathbf{P}_k(x)$.
On a sequence of monogenic polynomials satisfying the Appell condition whose first term is a non-constant function
Dixan Pea Pea
Mathematics , 2011,
Abstract: In this paper we aim at constructing a sequence $\{\mathsf{M}_n^k(x)\}_{n\ge0}$ of $\mathbb R_{0,m}$-valued polynomials which are monogenic in $\mathbb R^{m+1}$ satisfying the Appell condition (i.e. the hypercomplex derivative of each polynomial in the sequence equals, up to a multiplicative constant, its preceding term) but whose first term $\mathsf{M}_0^k(x)=\mathbf{P}_k(\underline x)$ is a $\mathbb R_{0,m}$-valued homogeneous monogenic polynomial in $\mathbb R^m$ of degree $k$ and not a constant like in the classical case. The connection of this sequence with the so-called Fueter's theorem will also be discussed.
Neurovascular Evaluation in Eugonadal Men with Type 2 Diabetes Mellitus and Erectile Disfunction: A Comparative Study between Responders and Not Responders to Phosphodiesterase 5 Inhibitors  [PDF]
Marcelo Rodriguez Pea, Elizabeth Ovando
Advances in Sexual Medicine (ASM) , 2015, DOI: 10.4236/asm.2015.54010
Abstract: The aim of our study was to evaluate functional alterations of the corpus cavernusum and its correlation with the lack of response to treatment with PDE5i in eugonadal patients with Type 2 Diabetes Mellitus and Erectile Dysfunction. In this prospective randomized study we included 157 patients. All were treated with 5 mg tadalafil daily and 100 mg sildenafil on demand and the response to treatment was assessed in 6 month by dividing them into 2 groups: G1: Good response. Significative improvement of erectile function according to IIEF-5, and G2: There was not an improvement with the treatment. At the end of the treatment we performed neurological and vascular studies to both groups. Also we performed CC-EMG in order to evaluate penile autonomic neuropathy. 82 patients were included in G1 and 75 in G2. The time evolution of the ED was 1.5 years for G1 and 5 years for G2. Average fasting glucose and glycosilated hemoglobin values were significantly higher in G2 than in G1. Also we observed significant differences in penile vascular parameters between both groups. Peripheral neuropathy parameters did not show differences between both groups. Cavernous smooth muscle electromyography showed asynchronous and asymetric potentials in G1 (minimal autonomic neuropathy) and denervation potentials in G2 characteristic of severe CC damage. It is concluded that vascular and autonomic alterations are causes of severe CC damage and lack of response to treatment with PDE5i in this population. Peripheral neuropathy is not part of this process.
Influence of Water Quality on the Variation Patterns of the Communities of Benthic Macroinvertebrates in the Lakes of the Central Highlands of Peru  [PDF]
María Custodio, Richard Pe?aloza
Open Journal of Marine Science (OJMS) , 2019, DOI: 10.4236/ojms.2019.91001
The influence of water quality on the variation patters of benthic macroin-vertebrate communities in the lakes in the central highlands of Peru was eva-luated. Samples of water and sediments were collected in 23 different sam-pling sites last 2017. The physiochemical variables of water quality deter-mined on site were: DO, TDS, EC, temperature and pH. The results obtained revealed that the physiochemical indicators are within the environmental quality standards for water, except COD and BOD5. Regarding the benthic macroinvertebrates, four phyla were identified wherein the most common is the phylum Arthropoda having the abundance and richness of taxa. The PCA reduced the variables to a few significant components that caused variation in water quality between lakes. The cluster analysis in relation to the relative abundance of benthic macroinvertibrates grouped the 22 sampling sites into three groups with the similar characteristics. The PCoA analysis of the ben-thic macroinvertebrate communities showed a clear separation of sites. The SIMPER analysis at the family-level showed the distribution of the most common species. Therefore, at a significance level of 0.01 it demonstrates that there are significant differences between the number of species and abun-dance of the areas that were evaluated.
Rese a de "Propiedades del primer sistema de teledetección hiperespectral chileno"
Marco A. Pea
Revista de Geografía, Norte Grande , 2010,
Flora intestinal, probióticos, prebióticos, simbióticos y alimentos novedosos Intestinal flora, probiotics, prebiotics, synbiotics and novel foods
A. S. Pea
Revista Espa?ola de Enfermedades Digestivas , 2007,
El significado de las mutaciones de CARD15 en la enfermedad de Crohn: La contribución espa ola The significance of CARD15 mutation in Crohn′disease: The Spanish contribution
A. S. Pea
Revista Espa?ola de Enfermedades Digestivas , 2007,
Personalized medicine: inevitable Medicina personalizada: inevitable
A. S. Pea
Revista Espa?ola de Enfermedades Digestivas , 2010,
Cultural Differences and the Construction of Meaning
Robert A. Pea
Education Policy Analysis Archives , 1997,
Abstract: The relationships between student achievement, student culture and practitioners' attitudes and expectations were investigated. Student achievement was defined as academic performance but also included perceptions, rationales and explanations for student behaviors and conduct. Student culture described student's Mexican American origins, customs and beliefs. Practitioners' attitudes described how middle school personnel perceived Mexican American high and underachieving students generally, and practitioners' expectations described how personnel interacted and behaved toward Mexican American students. Results indicated that Mexican American students perceived themselves and school personnel perceived these students as different from Anglo students. Mexican American cultural traditions were also perceived as inferior and disadvantageous by high achieving Mexican American students and by personnel. Underachieving Mexican American students generally valued their cultural traditions more positively than high achieving students becoming resistant to learning when these traditions were marginalized in school. Student achievement was also related to student compliance, student appearance, styles in written and verbal communication and practitioners' perceptions about the willingness of Mexican American students to practice and support Anglo norms. These findings are congruent with theories that discuss relationships between student achievement, student culture and practitioners' attitudes and expectations. Theories about school failure occurring less frequently in minority groups that are positively oriented toward their own and the dominant culture were contradicted and not supported in this research.
La depresión de Guadix-Baza
Pea, J. A.
Estudios Geologicos , 1985,
Abstract: The sedimentary environment of the Guadix-Baza Depression sediments, between Upper Miocene and Upper Pleistocene as stratigraphical age, is described. The paleogeographical reconstruction of the basin shows the Depression divided in different areas, the eastern and western conected by a central area. The marginal deposits and the central part ones are fluvial sediments (Grupo Guadix); they change towards the center of two areas in lacustrine sediments (Grupo Huélago in western area and Grupo Baza in eastern one), at the bottom of this last Group there are also marine sediments up to middle Pliocene, Vertebrate deposits and the influence of neotectonic in the Depression sedimentation in the time are described with more details. The next researchs, by an interdisciplinary group (in which the author works), for a best knowledge of the dinamic evolution of the Depression are planned. En este trabajo se hace el estudio de los ambientes sedimentarios de los materiales que rellenan la depresión de Guadix-Baza y que abarcan cronológicamente desde el Mioceno superior al Pleistoceno superior. Se hace una reconstrucción paleogeográfica de la cuenca, que según sus características puede dividirse en dos áreas: una oriental y otra occidental, comunicadas entre sí por una zona central. Los bordes de la cuenca y la parte central de la misma están rellenos por materiales fluviales (Grupo Guadix) que cambian lateralmente a facies lacustres (Grupo Huélago en el sector oeste ; y Grupo Baza, en el sector este) , en la base de esté último Grupo hay materiales marinos hasta el Plioceno medio. Se hacen puntualizaciones sobre las localidades de vertebrados encontradas y el pape! de la neotectónica en cuanto a la sedimentación en la cuenca a lo largo del tiempo. Se plantean, asimismo, las principales líneas de investigación a seguir dada la problemática existente, por un equipo interdisciplinar (a uno de los cuales pertenece el autor), para una mayor comprensión de la evolución dinámica de la cuenca.
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