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RISS 인기검색어
- 검색키워드
- 저자 : Rodriguez, Cristobal (검색결과 412 건)
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The distribution of roots of certain polynomials
Rodriguez, Miguel Antonio The University of Texas at Austin 2010 해외박사(DDOD)
We study the distribution of the roots of certain polynomials, among which are certain Hilbert and Ehrhart polynomials. We look at the roots of polynomials of the form H(x) = m=0dhm d+x-md . The generating function of the H(n), with n ∈ Z≥0 , is the Maclaurin series of P( t) = m=0dhm tm1-t d+1 . For x with realsx ∈ (0, 1) we represent H as the Mellin transform of P. We then use Laplace's method to study the asymptotic nature of H as its degree grows.
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Language attitudes and values among Galician adolescents
Loureiro-Rodriguez, Veronica University of California, Davis 2008 해외박사(DDOD)
In Galicia the linguistic hegemony of Spanish has historically triggered language shift from Galician to Spanish, which has significantly impacted the region's language policy and planning. In the Spanish Constitution of 1978, Galician status was elevated from that of "dialect" to "language", and was given co-official standing within the territorial confines of the region of Galicia. The institutionalization of the autochthonous language in Galicia resulted in the development of a regional language planning, the implementation of a bilingual education (Spanish/Galician) system, and the creation of a standardized norm. Together, these measures should restore the prestige lost to Galician and, most importantly, attract new speakers. However, recent research shows that Galician is losing speakers among the younger generations (Seminario de Sociolinguistica: 1994, 1995, 1996) and, although values towards the autochthonous language are increasingly more positive (del Valle 2000; Monteagudo-Romero 2000; Ramallo 2000; Beswick 2002; Bouzada-Fernandez 2002; Rodriguez-Neira 2002), certain deep-seated stigmas persist (Roseman 1995; Hermida 2001; O'Rourke 2003). In this dissertation, I look at Galician adolescents' values and attitudes towards local dialects of Galician, standard Galician, and (Castilian) Spanish, using quantitative data provided by a survey and a matched-guise test, and qualitative data provided by an open-ended written questionnaire and verbal interviews. My research subjects consist of 408 high school students (248 females and 160 males), with ages ranging from 12 to 18 years old. I chose high schools in an urban and a rural setting to observe whether the traditional association Galician/rural/lower class and Spanish/urban/higher class is still operating. Findings reveal that the institutionalized bilingualism and the implementation of standard Galician have unexpected repercussions on adolescents' language attitudes. Data analysis shows that sociolinguistic conflict arises from the confrontation of different linguistic varieties and the overlapping of new and traditional values, as well as old-deep stigmas, attached to standard Galician and dialectal Galician. In this language conflict, 'female/male' and 'urban/rural' variables proved to be highly significant. This dissertation will help understand the reasons behind adolescents' language choice and will shed some light on the current loss of Galician speakers among the younger generations.
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Rodriguez, Joshua Eliecer University of California, Los Angeles 2015 해외박사(DDOD)
This dissertation offers the first critical analysis of Alberto Ginastera's Cello Concerto No. 2 opus 50 (1980-81). It looks at the context of the work's creation (as a ten-year anniversary gift to his wife, cellist Aurora Natola), and explores the use of allusion, of symmetrical structures, and of its synthesis of musical polarities. While Ginastera's compositional approach is rigorous and logical, it is apparent that extra-musical influences play an important role in illuminating the work's musical decisions, embedded symbolism, and contextual significance. The author explores five people who may have influenced the Ginastera's personal and artistic aesthetics: wives Mercedes de Toro and Aurora Natola, cellist Pablo Casals, and composers Bela Bartok and Olivier Messiaen. Chapter One introduces the topic and explains the scope and methodology; Chapter Two illuminates the concerto's various non-musical influences and references; Chapter Three presents a musical theoretical analysis; Chapter Four discusses the work's various interpretive possibilities and significance: each with the purpose of a more integrated understanding of Ginastera's late style -- in particular of the Concerto's structural and thematic coherence. Concerto for Piano and Orchestra (2015) is an original work by Joshua Rodriguez that incorporates large and small-scale symmetrical structures; the Concerto's structure is, itself, an "interrupted palindrome". Newly composed music, which works in retrograde similarly to the second movement of Ginastera's Cello Concerto No. 2, is "interrupted" by an outside source of music -- Claude Goudimel's harmonization of Louis Bourgeois's melody for Psalm 8 (Genevan Psalter, 1542). Its first appearance alludes (in its orchestration) to the "guiding star" from Ives's Fourth Symphony; this truncated, retrograde appearance of Psalm 8 (played by a small ensemble in the back of the orchestra) is later "incarnate" within the musical world of the Concerto, played by the clarinet and first chair strings, with musical echoes sounding throughout the rest of the work. It is a multi-sectional, single movement work with a performances time of approximately 24 minutes.
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Flavonoids and related polyphenolic compounds in forage legumes
Rodriguez, Gerardo Rodriguez The University of Wisconsin - Madison 1999 해외박사(DDOD)
Alfalfa and red clover cause bloat and have high extent of proteolysis in the silo and rumen. Flavonoids and related polyphenols may alleviate these nutritional problems. However, an increased understanding of polyphenol methods of analysis is required in order to manipulate forage quality by altering phenolic composition. Gravimetric methods based on precipitation of flavonoids by polyvalent cations have an advantage over others methods because they do not require standards. Trivalent ytterbium forms insoluble chelates with flavonoids. Ytterbium completely precipitated quercetin, rutin and taxifolin. At neutral pH, ytterbium partially precipitated catechin, naringenin, phoretin and phloridzin and their precipitation was increased at higher pH. Variables such as pH and composition of the solvent, and ytterbium to flavonoid ratio, can be manipulated in order to optimize precipitation. Two phenylpropanoid compounds (trans-clovamide and phaselic acid) were isolated from leaves of red clover (Marathon), and are substrates for polyphenol oxidase. This enzyme was purified using a combination of temperature-induced phase partitioning in Triton X-114, ammonium sulfate fractionation and size exclusion chromatography. The optimum temperature for maximum activity was 52°C, and the best storage temperature was −20°C. An isoenzyme isolated by size exclusion chromatography had an activity of 148.8 abs/mg of protein, and a molecular weight of about 57 kDa. The lower extent of proteolysis of red clover silage compared to alfalfa is explained by polyphenol oxidase and phenylpropanoid substrates. A novel anthocyanin, cyanidin 3–O-(6<super>′</super><super> ′</super>-O-(acetyl)-2<super>′</super><super>′</super>-O-(β-D-glucuronyl)-β-D-glucopyranoside), was isolated from the red epidemis of alfalfa (<italic>Medicago sativa</italic> L.), Redline cultivar. A previously described anthocyanin, cyanidin 3-O-(2<super> ′</super><super>′</super>O-(β-D-glucuronyl)-β-glucopyranoside, was also isolated. The structures of three other anthocyanins were partially identified. Anthocyanins were incorporated into Redline by recurrent selection. Anthocyanins are biosynthetically related to polymeric flavonoids. These results suggest that non-bloating alfalfa can be produced by similar recurrent selection if the polymers can be detected in unique phenotypes.
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Rodriguez Rodriguez, Ana Maria The University of Wisconsin - Madison 2007 해외박사(DDOD)
This dissertation analyzes the representation of the Christian-Muslim relations in three 17th-century Spanish texts: Topographia e historia general de Argel, Cautiverio y trabajos de Diego Galan and Historia de Mindanao y Jolo. Topographia e historia general de Argel is the most significant non-fiction text about Algiers, and Christian captivity in this city, during the 16th and 17 th centuries. Cautiverio y trabajos de Diego Gala˘n details the circumstances that affected Christian captives in Istanbul, and also the interactions between Christians and Muslims along the Mediterranean shores. Finally, Historia de Mindanao y Jolo takes us to the Philippines, where the most unexpected reencounter with Islam took place during the Spanish colonial occupation of the islands. These three works also present the autobiographical experience of three individuals who, after leaving the realm of the familiar enter the Muslim world, experience contact with alterity, and go back to their points of departure, either literally or symbolically through their writings. My analysis tries to uncover the writing mechanisms used to represent the complex contact with the Muslim Other, revealing the three-sided negotiation that takes place in the writing process: the readers' expectations, the knowledge acquired after living with the Other, and also the transformations that such experience has provoked. Showing the nuances of the narrated experiences, I attempt to reveal the interplay between approach and rejection that takes place in the relationship with human beings and situations that are sometimes hard to understand but that define the configuration of the self and of the collective consciousness, in molds not always compliant with the official ideology--an ideology which is sometimes revealed as too narrow to contain the process of understanding both the self and the Other.
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Rodriguez Rodriguez, Jesus ProQuest Dissertations & Theses The University of 2016 해외박사(DDOD)
Evapotranspiration (ET) is a key parameter for irrigation planning and management, and it is a crucial factor for water conservation practices considering the challenges associated with agricultural water availability. Field ET determination is the most accurate, but remains to be expensive and limited in scope. On the other hand, remote sensing is becoming an alternative tool for the estimation of ET. Operational ET algorithms, like the Moderate Resolution Imaging Spectroradiometer (MODIS)-based ET, are now successful at generating ET estimates globally at 1km resolution, however their intent is not management of agriculture irrigation. This research was done to develop an integrated method for downscaling MODIS ET appropriate for farm-level applications using geostatistical and remote sensing techniques. The proposed methodology was applied in the Wellton-Mohawk Irrigation and Drainage District of Yuma, Arizona. In a first effort, ET data was downscaled from standard 1-km-MODIS to a medium 250-m-spatial resolution via cokriging using Land Surface Temperature and Enhanced Vegetation Index as covariates. Results showed consistent downscaled ET with a variance greater than the variance of the coarse scale input and nearly similar mean values. This 250m product can serve larger irrigation districts in developed countries, where plot size is fairly large and regular. However, the size and shapes of most farms in developing countries makes the 250m ET challenging. For this reason, the second part of this work was done to downscale global scale 1km ET to 30m farm level application for irrigation use. This approach involved the generation of daily vegetation indices (VI) at 30m in order to support the downscaling of MODIS 1km ET. Landsat and MODIS reflectances were combined with the Spatial and Temporal Adaptive Reflectance Fusion Model (STARFM) algorithm and the resulting VI data was used as a covariate to downscale ET with the cokriging approach. The results showed that the MODIS ET data seriously underestimates ET over irrigated areas. To correct this problem the MODIS data was then adjusted using field measured values to make it useful for operational purposes. The proposed geospatial method was applied to different growth stages of cotton and results were validated with actual ET from The Arizona Meteorological Network (AZMET) and published consumptive use of water for the area. The adjusted downscaled ET was comparable to these two published data (maximum error of 33%). This methodology is a practical alternative in areas where there is no ancillary data to estimate ET and it is expected to help in the planning of irrigation agriculture that will lead to improved agricultural productivity and irrigation efficiency.
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The effect of CAFTA in the Services Sector of El Salvador: A first approach
GUARDADO RODRIGUEZ, Gabriel Armando 아주대학교 국제대학원 2011 국내석사
The Central American and Dominican Republic Free Trade Agreement with the United States (DR-CAFTA or simply CAFTA), is the most important FTA signed by the region, this work suggests that there has been a general positive effect of CAFTA for the services sector of El Salvador. We found increases for El Salvador in FDI levels, particularly in those areas in which liberalization had been agreed, the same improved growth rates can be found in employment in the services sector and economic growth, where positive correlations are discovered between these indicators and overall services trade and services FDI. For most Central American countries that placed into force CAFTA before 2009, statistics show that trade in services as a whole has increased and important changes in growth are observed. Although trade deficits in services have become more profound during the first years of implementation of the FTA, we found a positive correlation between employment level and trade in services, thus our analysis also suggests that fostering trade in services should increase employment levels in Central America.
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Abiero, Arvie Rodriguez 삼육대학교 2019 국내석사
The recreational use of N-methyl-D-aspartate (NMDA) antagonist phencyclidine (PCP) and its analogues has grown rapidly due to their psychotomimetic properties. These drugs were reported to induce both non-fatal and fatal adverse effects and despite the enhanced regulation, they are continuously synthesized and are being sold in the illegal drug market. Among these are 1-phenylcyclohexan-1-amine hydrochloride (PCA HCl), 1-(1-(4 methoxyphenyl)cyclohexyl)piperidine hydrochloride (4′-MeO-PCP HCl), and 4‐[1‐(3‐methoxyphenyl)cyclohexyl] morpholine hydrochloride (3-MeO-PCMo HCl). However, studies characterizing their abuse potential are still lacking. Therefore, we evaluated their rewarding and reinforcing effects through the conditioned-place preference (CPP), self-administration (SA) under the fixed ratio (FR1, FR2, and FR3) and progressive ratio (PR) schedules and locomotor sensitization paradigm. Pretreatment with SCH23390 and haloperidol was performed to evaluate the involvement of dopamine (DA) system in their rewarding effects. We performed western blotting to determine the effects of drugs on the DA-related protein as well as the involvement of phosphorylated CREB and ΔFosB and brain-derived neurotrophic factor (BDNF) in the ventral tegmental area (VTA) and nucleus accumbens (NAc). Finally, we examined their effects on brain wave activity using electroencephalography (EEG). All three drugs induced CPP in mice and were self-administered by rats. The 4’-MeO-PCP induced locomotor sensitization in mice. SCH23390 and haloperidol blocked the CPP. These drugs altered the TH, DRD1, and DRD2 as well as the p-CREB, ΔFosB, and BDNF. Similarly, these drugs altered the delta and gamma waves in the brain, which then normalized by SCH23390 and haloperidol. The present findings indicate the role of the dopaminergic system in the rewarding and reinforcing properties of these PCP analogues. We advocate thorough monitoring of these drugs as they pose potential harm to general public health.
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