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Papers by luis leyva

Research paper thumbnail of 개화성 백악질 골 이형성증

대한구강악안면외과학회지, Dec 1, 2011

Research paper thumbnail of Supplementary information to 'Defining pottery use and exploitation of natural products at Clairvaux XIV during the Middle Neolithic

Investigating pottery function requires optimal preservation of both ceramic vessels and organic ... more Investigating pottery function requires optimal preservation of both ceramic vessels and organic residues related to vessel use. If these criteria are met then opportunities emerge for combining macroscopic observations, typological classification, and capacity measurements and molecular and isotopic proxies (GC, GC-MS, and GC-C-IRMS) to explore vessel use and resource exploitation. The exceptional ceramic assemblage of hundreds of vessels excavated from the Middle Neolithic site of Clairvaux XIV (Jura, France, IVth millennium B.C.) offered such an opportunity, with a wide diversity of vessel shapes and extraordinary preservation of lipids. Interrogating the lipid residues together with typological analyses revealed a complex system of ceramic vessel use. Despite the scarcity of aquatic products, a wide diversity of natural substances has been detected: ruminant adipose fats, dairy products, plant substances, and beeswax. These commodities were processed in specific vessels with thr...

Research paper thumbnail of Blending academic and social support through apoyo and consejos for undergraduate mathematics success among Latin@s

Research paper thumbnail of From Taxicabs to Towers: An Analysis of Problem-Solving Strategies

Problem solving is a cornerstone to the mathematical learning experience that makes possible stud... more Problem solving is a cornerstone to the mathematical learning experience that makes possible students' application of creative strategies and logical reasoning while working to complete particular tasks. This analytic is a detailed overview of various problem-solving strategies employed by four twelfth-grade students - Brian, Jeff, Michael, and Romina - when solving the Taxicab Problem, a challenging mathematical task involving combinatorial reasoning and ideas from coordinate geometry. Each clip presents a different focus and its respective contribution to the high school students' Taxicab Problem solution. Among these highlighted problem-solving tactics are peer discussion, solving a simpler problem, pattern discovery, drawing a diagram as a representation, and building isomorphisms. The analytic was developed as an interactive instructional tool not only for K-12 teachers who may wish to integrate a problem solving unit, but also for mathematics teacher educators as a sta...

Research paper thumbnail of A Queer of Color Challenge to Neutrality in Undergraduate Stem Pedagogy as a White, Cisheteropatriarchal Space

Journal of Women and Minorities in Science and Engineering, 2022

Research paper thumbnail of Developing Isomorphic Relationships in High School Mathematics

The fundamental concept of isomorphisms is often not formally introduced to students until more a... more The fundamental concept of isomorphisms is often not formally introduced to students until more advanced, college-level mathematics courses such as calculus or real number analysis. However, this delayed presentation should not lead mathematics educators to assume that students are unable to build an understanding of the idea as they construct these isomorphic relationships earlier in their mathematical explorations. This analytic presents four eleventh-grade students - Amy Lynn, Robert, Shelly, and Stephanie - engaged in a challenging problem-solving experience with a combinatorics task referred to as the Pizza Problem. To understand and solve the Pizza Problem, the group developed a mediated isomorphism with Pascal's Triangle serving as the mediator between the Pizza Problem and the previously-solved Towers Problem. This video analysis uses the works of Dienes (2002), Greer & Harel (1998), Maher (2005), Tarlow (2010), and Uptegrove & Maher (2004) to trace the high school stude...

Research paper thumbnail of An Intersectional Analysis of Latin@ College Women's Counter-stories in Mathematics

In this article, the author discusses the intersectionality of mathematics experiences for two La... more In this article, the author discusses the intersectionality of mathematics experiences for two Latin@ college women pursuing mathematics-intensive STEM (science, technology, engineering, and mathematics) majors at a large, predominantly White university. The author employs intersectionality and poststructural theories to explore and make meaning of their experiences in relation to discourses of mathematics ability and pursuits of STEM higher education. A cross-case analysis of two Latin@ college women's counter-stories details the development of success-oriented beliefs and strategies in navigating the discourses that they encountered institutionally and interpersonally in their mathematics experiences. Implications are raised for P--16 mathematics and STEM education to broaden equitable learning opportunities for Latin@ women and other marginalized groups' construction of positive mathematics identities at intersections of gender and other social identities

Research paper thumbnail of *We are grateful to the Inter-American Development Bank, the Gildor Foundation, the NSF, and the Doing Business project of the World Bank for financial support, to Alfredo Larrea-Falcony

We examine the effect of securities laws on market development in 49 countries. We find that publ... more We examine the effect of securities laws on market development in 49 countries. We find that public enforcement of laws benefits securities markets, especially in countries with efficient government bureaucracies. We also find that organization of private enforcement through disclosure and liability rules benefits securities markets in countries with both efficient and inefficient government bureaucracies.

Research paper thumbnail of Principal Contributors

This report has been reviewed by the staff of the Air Resources Board and approved for publicatio... more This report has been reviewed by the staff of the Air Resources Board and approved for publication. Approval does not signify that the contents necessarily reflect the views and policies of the Air Resources Board, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. i This Page Left Intentionally Blank ii Acknowledgments This report was prepared with the assistance and support from many individuals within the Air Resources Board; not only the principal contributors. In addition, staff would like to acknowledge the assistance and cooperation that we have received from many individuals and organizations. Finally, staff would like to acknowledge the significant contributions from the California Energy Commission, California Public Utilities

Research paper thumbnail of Tópicos Ambientales y Conservación de Ecosistemas Naturales

Las investigaciones presentadas en el libro “Tópicos Ambientales y Conservación de Ecosistemas Na... more Las investigaciones presentadas en el libro “Tópicos Ambientales y Conservación de Ecosistemas Naturales” reúne trabajos de especialistas de diferentes campos de la ciencias ambientales, y fueron realizadas en el marco de los Programas Multidisciplinarios de Posgrados en Ciencias Ambientales (PMPCA) de la Universidad Autónoma de San Luis Potosí, México, y através Laboratorio Nacional de Geoprocesamiento de Información Fitosanitaria (LANGIF) de la Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología (CIACYT). Asimismo, participaron investigadores de la red de universidades del Center For Natural Resources and Development (CNRD), tales como la Universidad de Gadjah Mada, de Indonesia, la Universidad Federal Fluminense de Brasil y el Centro de Investigación y Promoción del Campesinado Regional Norte Amazónico de Bolivia (CIPCA). Las publicaciones del presente libro pretenden mejorar la comprensión de los problemas ambientales a través de diferentes casos de estudios a nivel local, regional y global. Resalta los principios de la sustentabilidad que promueve la protección del ambiente y amplía el conocimiento de los procesos ambientales en relación con los factores sociales, económicos y culturales. Asimismo, fomenta la extensión de prácticas y medios de vida sostenibles en diferentes contextos, y acrecienta el conocimiento científico acerca de cuestiones ambientales en el contexto local, regional e internacional. El libro reúne una serie de investigaciones con diferentes tópicos que abordan la problemática ambiental desde diferentes perspectivas y se presentan casos de estudios relacionados a la conservación de ecosistemas naturales. En el primer caso de estudio se analiza el impacto de las actividades turísticas sobre las islas Karimunjawa en Java Central, Indonesia, en donde a través de percepción remota se identificó la relación entre el crecimiento de las actividades turísticas y los cambios de coberturas de los hábitats bénticos. En el segundo capítulo se evalúa el potencial de los recursos del suelo en el área del Volcán Kelud, Java Oriental, Indonesia; basado en el análisis de la unidad de relieve se identificó el efecto de los recursos alterados del suelo en el área del Volcán Kelud sobre las actividades de turismo, de las plantaciones y la minería. El capítulo tres resalta la importancia del manejo y conservación del bosque húmedo tropical a escala global, que a través del Manejo Forestal Sostenible evitaría mayor cantidad de emisiones de carbono, y se lo considera como una herramienta de mitigación ante el cambio climático. El capítulo cuatro se analiza el valor económico de la producción familiar en la Amazonía boliviana para poder evaluar su potencial para propuestas alternativas de desarrollo y así mejorar la sostenibilidad de los ecosistemas amazónicos. El subsiguiente caso de estudio (capítulo 5), analiza la vulnerabilidad de los recursos forestales en la Sierra de San Miguelito, en el Estado de San Luis Potosí, México; y a través sistemas de información geográfica y análisis estadísticos se detectaron los cambios espacio-temporales ocurridos en la zona y aquellas áreas sujetas a mayor presión según factores ambientales y sociales. En esa misma línea, el capítulo seis se propone una metodología para identificar las trayectorias evolutivas de los cambios en la cobertura del suelo y el paisaje, a través de un análisis híbrido de imágenes de satélite utilizando percepción remota,en un área de Río de Janeiro, Brasil. Los restantes casos de estudios que se abordan tienen una relación con la Región Huasteca de México. El capítulo siete se evalúa en materia de historia ambiental los principales cambios de cobertura y uso de suelo en la región Huasteca entre 1521 y 2011, en diferentes etapas de la historia mexicana, dado que en esta región ha existido una pérdida considerable del recurso forestal que ha generado un impacto sobre sus ecosistemas.El capítulo ocho hace un análisis general sobre el potencial económico y la actual problemática social y ambiental en las tres microrregiones de la Huasteca Potosina. El subsiguiente caso de estudio (capítulo 9) analiza a través de modelo bayesianos los patrones de distribución espacial de riesgo y los factores ambientales y socioeconómicos que favorecen la propagación de la enfermedad de Chagas en la Huasteca Potosina. En el capítulo 10, se realiza una reconstrucción de escenarios forestales en el “Ejido Laguna del Mante” y la “Comunidad Tocoy” de la Huasteca Potosina, a través de talleres participativos de percepción de las coberturas y usos de suelo, y apoyados en imágenes de satélite, con el fin de desarrollar estrategias y generación de políticas locales en pro de la conservación y manejo de los recursos forestales. El capítulo 11, se reconoce y evalúa a través de mediciones in situ con un espectroradiómetro hiperespectral, la variabilidad espacial y espectral de la infección por el barrenador Diatraea saccharalis, plaga de la caña de…

Research paper thumbnail of Defining pottery use and exploitation of natural products at Clairvaux XIV during the Middle Neolithic

Research paper thumbnail of Zielgruppengerechte Risikokommunikation zum Thema Nahrungsergänzungsmittel : Abschlussbericht

Das Projekt „Durchfuhrung einer zielgruppengerechten Risikokommunikation zu Nahrungserganzungsmit... more Das Projekt „Durchfuhrung einer zielgruppengerechten Risikokommunikation zu Nahrungserganzungsmitteln“ ist als Grundlagenstudie zum aktuellen Nutzungs- und Informationsverhalten von Nahrungserganzungsmittel-Verwendern sowie zur Identifikation von Nutzertypen konzipiert worden. Hintergrund der Untersuchung ist der Umsatzanstieg von Nahrungserganzungsmitteln um ca. die anderthalbfache Menge seit Ende der 1990er-Jahre. Diese Entwicklung macht eine Aufklarung und Sensibilisierung der Verbraucher zum Konsum von Nahrungserganzungsmitteln und den damit verbundenen moglichen Gesundheitsrisiken erforderlich. Ziel der Untersuchung ist die Optimierung der bestehenden Verbraucheraufklarung zu Risiken der Verwendung von Nahrungserganzungsmitteln durch die Entwicklung einer zielgruppengerechten Risikokommunikation.

Research paper thumbnail of Nuevos datos acerca de Phyllanthus pseudocicca (Phyllanthaceae)

Phyllanthus is one of the largest genera within the angiosperms and in Cuba it is represented by ... more Phyllanthus is one of the largest genera within the angiosperms and in Cuba it is represented by 50 species. Among these species is P. pseudocicca that presents ancestral features within the genus. The infrageneric classification of this taxon has not been fully clarified and it has been included in several subgenera within Phyllanthus due to several similarities with other representatives of the genus. However, there is no complete morphological description of the species, since the characteristics of its fruits and seeds are not known. Therefore, the aim of this work is to describe fruits and seeds, update the nomenclature and distribution data of P. pseudoccica . For this, 89 herbarium materials and several field surveys were reviewed where individuals with fruits were found and different characters, from the fruit and seeds, were analyzed. For the nomenclatural work, the protologues and type materials of the names of the taxa referred to Cuba were reviewed and the geographical d...

Research paper thumbnail of La evaluación de la calidad del aprendizaje en escolares primarios

El imperativo de la evaluacion de la calidad del aprendizaje en la escuela primaria requiere de e... more El imperativo de la evaluacion de la calidad del aprendizaje en la escuela primaria requiere de esclarecer nuevos terminos conceptuales que se introducen desde la Evaluacion Educativa en la praxis pedagogica del maestro, en tal sentido, la obra presentada esclarece diversas posiciones y muestra un Modelo pedagogico contextualizando una educacion de calidad a partir del Modelo de escuela primaria cubana. Se establece, ademas, la diferencia entre evaluacion escolar y evaluacion educativa a traves una concepcion holistica de evaluacion que incluye una estrategia metodologica sustentada en el Modelo propuesto para su implementacion.

Research paper thumbnail of Konsep Akad Dalam Lingkup Ekonomi Syariah

Tujuan dari penelitian ini adalah untuk menganalisa konsep akad dalam Islam. Akad merupakan titik... more Tujuan dari penelitian ini adalah untuk menganalisa konsep akad dalam Islam. Akad merupakan titik tolak yang menjadi pegangan dalam melaksanakan perjanjian yang disepakati. Para pihak yang melakukan akad harus mengetahui segala sesuatu yang berkaitan dengan akad. Metode yang digunakan dalam penelitian ini adalah deskriptif analitis yaitu penelitian yang menggambarkan konsep- konsep akad menurut para ulama fiqh untuk kemudian dianalisis terkait penerapannya pada akad-akad yang berlaku dalam lingkup ekonomi syariah. Data yang diperoleh dalam tulisan ini berdasarkan studi kepustakaan. Terdapat perbedaan pendapat diantara ulama diantaranya terkait rukun akad, menurut hanafiyah rukun akad hanya satu yaitu shighat akad sedangkan menurut jumhur ulama rukun akad meliputi shighat akad, kedua belah pihak yang melakukan akad serta obyek akad. Dalam Kompilasi Hukum Ekonomi Syariah ketentuan mengenai rukun akad cenderung mengikuti pendapat jumhur. Hal ini dapat dilihat sebagaimana dalam BAB III ...

Research paper thumbnail of Beyond the Box : Rethinking Gender in Mathematics Education Research

Τhe present symposium is an attempt to rethink gender in mathematics education research beyond th... more Τhe present symposium is an attempt to rethink gender in mathematics education research beyond the box, and specifically the box of binaries. We consider the importance in contemporary neoliberal t ...

Research paper thumbnail of Milk as a pivotal medium in the domestication of cattle, sheep and goats

The ability to lactate connects us with all mammals big and small, indeed it was the key characte... more The ability to lactate connects us with all mammals big and small, indeed it was the key characteristic used by Linnaeus to determine the taxonomic class Mammalia. The milk of domesticated animals is a rich resource that can be transformed by humans into a myriad of dairy products with long and short shelf-lives. Archaeozoological evidence suggests that perhaps milk was a principal catalyst in the domestication of cattle, sheep and goats starting from 10.5 kyBP. Direct evidence for the processing of milk is found in the first ceramic vessels excavated at early farming communities in Near East and Europe dating from the 9 kyBP indicating that human populations largely intolerant to lactose, the main sugar in milk, were processing milk in ceramic vessels. Innovation in techniques to process milk through cooking and other methods, such as fermentation, to enable milk consumption without adverse side effects, appears to have been a component of the European Neolithic package. For the pi...

Research paper thumbnail of One dimensionnal miniaturized microstrip filters wihthin planar arrays of terminal satellite primary sources

Research paper thumbnail of Rethinking Transdisciplinarity in the Learning Sciences: Critical and Emergent Perspectives

Research paper thumbnail of Mužská a ženská identita v súčasnej spoločnosti so zameraním na reklamu

Tato diplomova prace se zabýva problematikou mužske a ženske identity v soucasne spolecnosti, při... more Tato diplomova prace se zabýva problematikou mužske a ženske identity v soucasne spolecnosti, přicemž jejim užsim zaměřenim je jeji zobrazeni v televiznich reklamach. Cilem prace je realizace obsahove analýzy, zaměřene na zobrazeni postav mužů a žen v televiznich reklamach. Teoreticka cast prace se sklada ze ctyř kapitol. Prvni kapitola popisuje obecna teoreticka východiska, z kterých prace vychazi. Druha a třeti kapitola se zabýva specifiky mužske a ženske identity. Ctvrta kapitola popisuje výzkumnou metodu obsahove analýzy a předklada cil výzkumu a stanovene hypotezy. Analyticka cast prace zkouma zobrazeni mužů a žen v televiznich reklamach ve dvou rovinach - v rovině hlavnich postav i v rovině reklam. Zavěrecna cast analyticke casti interpretuje zjistěne výsledky analýzy.

Research paper thumbnail of 개화성 백악질 골 이형성증

대한구강악안면외과학회지, Dec 1, 2011

Research paper thumbnail of Supplementary information to 'Defining pottery use and exploitation of natural products at Clairvaux XIV during the Middle Neolithic

Investigating pottery function requires optimal preservation of both ceramic vessels and organic ... more Investigating pottery function requires optimal preservation of both ceramic vessels and organic residues related to vessel use. If these criteria are met then opportunities emerge for combining macroscopic observations, typological classification, and capacity measurements and molecular and isotopic proxies (GC, GC-MS, and GC-C-IRMS) to explore vessel use and resource exploitation. The exceptional ceramic assemblage of hundreds of vessels excavated from the Middle Neolithic site of Clairvaux XIV (Jura, France, IVth millennium B.C.) offered such an opportunity, with a wide diversity of vessel shapes and extraordinary preservation of lipids. Interrogating the lipid residues together with typological analyses revealed a complex system of ceramic vessel use. Despite the scarcity of aquatic products, a wide diversity of natural substances has been detected: ruminant adipose fats, dairy products, plant substances, and beeswax. These commodities were processed in specific vessels with thr...

Research paper thumbnail of Blending academic and social support through apoyo and consejos for undergraduate mathematics success among Latin@s

Research paper thumbnail of From Taxicabs to Towers: An Analysis of Problem-Solving Strategies

Problem solving is a cornerstone to the mathematical learning experience that makes possible stud... more Problem solving is a cornerstone to the mathematical learning experience that makes possible students' application of creative strategies and logical reasoning while working to complete particular tasks. This analytic is a detailed overview of various problem-solving strategies employed by four twelfth-grade students - Brian, Jeff, Michael, and Romina - when solving the Taxicab Problem, a challenging mathematical task involving combinatorial reasoning and ideas from coordinate geometry. Each clip presents a different focus and its respective contribution to the high school students' Taxicab Problem solution. Among these highlighted problem-solving tactics are peer discussion, solving a simpler problem, pattern discovery, drawing a diagram as a representation, and building isomorphisms. The analytic was developed as an interactive instructional tool not only for K-12 teachers who may wish to integrate a problem solving unit, but also for mathematics teacher educators as a sta...

Research paper thumbnail of A Queer of Color Challenge to Neutrality in Undergraduate Stem Pedagogy as a White, Cisheteropatriarchal Space

Journal of Women and Minorities in Science and Engineering, 2022

Research paper thumbnail of Developing Isomorphic Relationships in High School Mathematics

The fundamental concept of isomorphisms is often not formally introduced to students until more a... more The fundamental concept of isomorphisms is often not formally introduced to students until more advanced, college-level mathematics courses such as calculus or real number analysis. However, this delayed presentation should not lead mathematics educators to assume that students are unable to build an understanding of the idea as they construct these isomorphic relationships earlier in their mathematical explorations. This analytic presents four eleventh-grade students - Amy Lynn, Robert, Shelly, and Stephanie - engaged in a challenging problem-solving experience with a combinatorics task referred to as the Pizza Problem. To understand and solve the Pizza Problem, the group developed a mediated isomorphism with Pascal's Triangle serving as the mediator between the Pizza Problem and the previously-solved Towers Problem. This video analysis uses the works of Dienes (2002), Greer & Harel (1998), Maher (2005), Tarlow (2010), and Uptegrove & Maher (2004) to trace the high school stude...

Research paper thumbnail of An Intersectional Analysis of Latin@ College Women's Counter-stories in Mathematics

In this article, the author discusses the intersectionality of mathematics experiences for two La... more In this article, the author discusses the intersectionality of mathematics experiences for two Latin@ college women pursuing mathematics-intensive STEM (science, technology, engineering, and mathematics) majors at a large, predominantly White university. The author employs intersectionality and poststructural theories to explore and make meaning of their experiences in relation to discourses of mathematics ability and pursuits of STEM higher education. A cross-case analysis of two Latin@ college women's counter-stories details the development of success-oriented beliefs and strategies in navigating the discourses that they encountered institutionally and interpersonally in their mathematics experiences. Implications are raised for P--16 mathematics and STEM education to broaden equitable learning opportunities for Latin@ women and other marginalized groups' construction of positive mathematics identities at intersections of gender and other social identities

Research paper thumbnail of *We are grateful to the Inter-American Development Bank, the Gildor Foundation, the NSF, and the Doing Business project of the World Bank for financial support, to Alfredo Larrea-Falcony

We examine the effect of securities laws on market development in 49 countries. We find that publ... more We examine the effect of securities laws on market development in 49 countries. We find that public enforcement of laws benefits securities markets, especially in countries with efficient government bureaucracies. We also find that organization of private enforcement through disclosure and liability rules benefits securities markets in countries with both efficient and inefficient government bureaucracies.

Research paper thumbnail of Principal Contributors

This report has been reviewed by the staff of the Air Resources Board and approved for publicatio... more This report has been reviewed by the staff of the Air Resources Board and approved for publication. Approval does not signify that the contents necessarily reflect the views and policies of the Air Resources Board, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. i This Page Left Intentionally Blank ii Acknowledgments This report was prepared with the assistance and support from many individuals within the Air Resources Board; not only the principal contributors. In addition, staff would like to acknowledge the assistance and cooperation that we have received from many individuals and organizations. Finally, staff would like to acknowledge the significant contributions from the California Energy Commission, California Public Utilities

Research paper thumbnail of Tópicos Ambientales y Conservación de Ecosistemas Naturales

Las investigaciones presentadas en el libro “Tópicos Ambientales y Conservación de Ecosistemas Na... more Las investigaciones presentadas en el libro “Tópicos Ambientales y Conservación de Ecosistemas Naturales” reúne trabajos de especialistas de diferentes campos de la ciencias ambientales, y fueron realizadas en el marco de los Programas Multidisciplinarios de Posgrados en Ciencias Ambientales (PMPCA) de la Universidad Autónoma de San Luis Potosí, México, y através Laboratorio Nacional de Geoprocesamiento de Información Fitosanitaria (LANGIF) de la Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología (CIACYT). Asimismo, participaron investigadores de la red de universidades del Center For Natural Resources and Development (CNRD), tales como la Universidad de Gadjah Mada, de Indonesia, la Universidad Federal Fluminense de Brasil y el Centro de Investigación y Promoción del Campesinado Regional Norte Amazónico de Bolivia (CIPCA). Las publicaciones del presente libro pretenden mejorar la comprensión de los problemas ambientales a través de diferentes casos de estudios a nivel local, regional y global. Resalta los principios de la sustentabilidad que promueve la protección del ambiente y amplía el conocimiento de los procesos ambientales en relación con los factores sociales, económicos y culturales. Asimismo, fomenta la extensión de prácticas y medios de vida sostenibles en diferentes contextos, y acrecienta el conocimiento científico acerca de cuestiones ambientales en el contexto local, regional e internacional. El libro reúne una serie de investigaciones con diferentes tópicos que abordan la problemática ambiental desde diferentes perspectivas y se presentan casos de estudios relacionados a la conservación de ecosistemas naturales. En el primer caso de estudio se analiza el impacto de las actividades turísticas sobre las islas Karimunjawa en Java Central, Indonesia, en donde a través de percepción remota se identificó la relación entre el crecimiento de las actividades turísticas y los cambios de coberturas de los hábitats bénticos. En el segundo capítulo se evalúa el potencial de los recursos del suelo en el área del Volcán Kelud, Java Oriental, Indonesia; basado en el análisis de la unidad de relieve se identificó el efecto de los recursos alterados del suelo en el área del Volcán Kelud sobre las actividades de turismo, de las plantaciones y la minería. El capítulo tres resalta la importancia del manejo y conservación del bosque húmedo tropical a escala global, que a través del Manejo Forestal Sostenible evitaría mayor cantidad de emisiones de carbono, y se lo considera como una herramienta de mitigación ante el cambio climático. El capítulo cuatro se analiza el valor económico de la producción familiar en la Amazonía boliviana para poder evaluar su potencial para propuestas alternativas de desarrollo y así mejorar la sostenibilidad de los ecosistemas amazónicos. El subsiguiente caso de estudio (capítulo 5), analiza la vulnerabilidad de los recursos forestales en la Sierra de San Miguelito, en el Estado de San Luis Potosí, México; y a través sistemas de información geográfica y análisis estadísticos se detectaron los cambios espacio-temporales ocurridos en la zona y aquellas áreas sujetas a mayor presión según factores ambientales y sociales. En esa misma línea, el capítulo seis se propone una metodología para identificar las trayectorias evolutivas de los cambios en la cobertura del suelo y el paisaje, a través de un análisis híbrido de imágenes de satélite utilizando percepción remota,en un área de Río de Janeiro, Brasil. Los restantes casos de estudios que se abordan tienen una relación con la Región Huasteca de México. El capítulo siete se evalúa en materia de historia ambiental los principales cambios de cobertura y uso de suelo en la región Huasteca entre 1521 y 2011, en diferentes etapas de la historia mexicana, dado que en esta región ha existido una pérdida considerable del recurso forestal que ha generado un impacto sobre sus ecosistemas.El capítulo ocho hace un análisis general sobre el potencial económico y la actual problemática social y ambiental en las tres microrregiones de la Huasteca Potosina. El subsiguiente caso de estudio (capítulo 9) analiza a través de modelo bayesianos los patrones de distribución espacial de riesgo y los factores ambientales y socioeconómicos que favorecen la propagación de la enfermedad de Chagas en la Huasteca Potosina. En el capítulo 10, se realiza una reconstrucción de escenarios forestales en el “Ejido Laguna del Mante” y la “Comunidad Tocoy” de la Huasteca Potosina, a través de talleres participativos de percepción de las coberturas y usos de suelo, y apoyados en imágenes de satélite, con el fin de desarrollar estrategias y generación de políticas locales en pro de la conservación y manejo de los recursos forestales. El capítulo 11, se reconoce y evalúa a través de mediciones in situ con un espectroradiómetro hiperespectral, la variabilidad espacial y espectral de la infección por el barrenador Diatraea saccharalis, plaga de la caña de…

Research paper thumbnail of Defining pottery use and exploitation of natural products at Clairvaux XIV during the Middle Neolithic

Research paper thumbnail of Zielgruppengerechte Risikokommunikation zum Thema Nahrungsergänzungsmittel : Abschlussbericht

Das Projekt „Durchfuhrung einer zielgruppengerechten Risikokommunikation zu Nahrungserganzungsmit... more Das Projekt „Durchfuhrung einer zielgruppengerechten Risikokommunikation zu Nahrungserganzungsmitteln“ ist als Grundlagenstudie zum aktuellen Nutzungs- und Informationsverhalten von Nahrungserganzungsmittel-Verwendern sowie zur Identifikation von Nutzertypen konzipiert worden. Hintergrund der Untersuchung ist der Umsatzanstieg von Nahrungserganzungsmitteln um ca. die anderthalbfache Menge seit Ende der 1990er-Jahre. Diese Entwicklung macht eine Aufklarung und Sensibilisierung der Verbraucher zum Konsum von Nahrungserganzungsmitteln und den damit verbundenen moglichen Gesundheitsrisiken erforderlich. Ziel der Untersuchung ist die Optimierung der bestehenden Verbraucheraufklarung zu Risiken der Verwendung von Nahrungserganzungsmitteln durch die Entwicklung einer zielgruppengerechten Risikokommunikation.

Research paper thumbnail of Nuevos datos acerca de Phyllanthus pseudocicca (Phyllanthaceae)

Phyllanthus is one of the largest genera within the angiosperms and in Cuba it is represented by ... more Phyllanthus is one of the largest genera within the angiosperms and in Cuba it is represented by 50 species. Among these species is P. pseudocicca that presents ancestral features within the genus. The infrageneric classification of this taxon has not been fully clarified and it has been included in several subgenera within Phyllanthus due to several similarities with other representatives of the genus. However, there is no complete morphological description of the species, since the characteristics of its fruits and seeds are not known. Therefore, the aim of this work is to describe fruits and seeds, update the nomenclature and distribution data of P. pseudoccica . For this, 89 herbarium materials and several field surveys were reviewed where individuals with fruits were found and different characters, from the fruit and seeds, were analyzed. For the nomenclatural work, the protologues and type materials of the names of the taxa referred to Cuba were reviewed and the geographical d...

Research paper thumbnail of La evaluación de la calidad del aprendizaje en escolares primarios

El imperativo de la evaluacion de la calidad del aprendizaje en la escuela primaria requiere de e... more El imperativo de la evaluacion de la calidad del aprendizaje en la escuela primaria requiere de esclarecer nuevos terminos conceptuales que se introducen desde la Evaluacion Educativa en la praxis pedagogica del maestro, en tal sentido, la obra presentada esclarece diversas posiciones y muestra un Modelo pedagogico contextualizando una educacion de calidad a partir del Modelo de escuela primaria cubana. Se establece, ademas, la diferencia entre evaluacion escolar y evaluacion educativa a traves una concepcion holistica de evaluacion que incluye una estrategia metodologica sustentada en el Modelo propuesto para su implementacion.

Research paper thumbnail of Konsep Akad Dalam Lingkup Ekonomi Syariah

Tujuan dari penelitian ini adalah untuk menganalisa konsep akad dalam Islam. Akad merupakan titik... more Tujuan dari penelitian ini adalah untuk menganalisa konsep akad dalam Islam. Akad merupakan titik tolak yang menjadi pegangan dalam melaksanakan perjanjian yang disepakati. Para pihak yang melakukan akad harus mengetahui segala sesuatu yang berkaitan dengan akad. Metode yang digunakan dalam penelitian ini adalah deskriptif analitis yaitu penelitian yang menggambarkan konsep- konsep akad menurut para ulama fiqh untuk kemudian dianalisis terkait penerapannya pada akad-akad yang berlaku dalam lingkup ekonomi syariah. Data yang diperoleh dalam tulisan ini berdasarkan studi kepustakaan. Terdapat perbedaan pendapat diantara ulama diantaranya terkait rukun akad, menurut hanafiyah rukun akad hanya satu yaitu shighat akad sedangkan menurut jumhur ulama rukun akad meliputi shighat akad, kedua belah pihak yang melakukan akad serta obyek akad. Dalam Kompilasi Hukum Ekonomi Syariah ketentuan mengenai rukun akad cenderung mengikuti pendapat jumhur. Hal ini dapat dilihat sebagaimana dalam BAB III ...

Research paper thumbnail of Beyond the Box : Rethinking Gender in Mathematics Education Research

Τhe present symposium is an attempt to rethink gender in mathematics education research beyond th... more Τhe present symposium is an attempt to rethink gender in mathematics education research beyond the box, and specifically the box of binaries. We consider the importance in contemporary neoliberal t ...

Research paper thumbnail of Milk as a pivotal medium in the domestication of cattle, sheep and goats

The ability to lactate connects us with all mammals big and small, indeed it was the key characte... more The ability to lactate connects us with all mammals big and small, indeed it was the key characteristic used by Linnaeus to determine the taxonomic class Mammalia. The milk of domesticated animals is a rich resource that can be transformed by humans into a myriad of dairy products with long and short shelf-lives. Archaeozoological evidence suggests that perhaps milk was a principal catalyst in the domestication of cattle, sheep and goats starting from 10.5 kyBP. Direct evidence for the processing of milk is found in the first ceramic vessels excavated at early farming communities in Near East and Europe dating from the 9 kyBP indicating that human populations largely intolerant to lactose, the main sugar in milk, were processing milk in ceramic vessels. Innovation in techniques to process milk through cooking and other methods, such as fermentation, to enable milk consumption without adverse side effects, appears to have been a component of the European Neolithic package. For the pi...

Research paper thumbnail of One dimensionnal miniaturized microstrip filters wihthin planar arrays of terminal satellite primary sources

Research paper thumbnail of Rethinking Transdisciplinarity in the Learning Sciences: Critical and Emergent Perspectives

Research paper thumbnail of Mužská a ženská identita v súčasnej spoločnosti so zameraním na reklamu

Tato diplomova prace se zabýva problematikou mužske a ženske identity v soucasne spolecnosti, při... more Tato diplomova prace se zabýva problematikou mužske a ženske identity v soucasne spolecnosti, přicemž jejim užsim zaměřenim je jeji zobrazeni v televiznich reklamach. Cilem prace je realizace obsahove analýzy, zaměřene na zobrazeni postav mužů a žen v televiznich reklamach. Teoreticka cast prace se sklada ze ctyř kapitol. Prvni kapitola popisuje obecna teoreticka východiska, z kterých prace vychazi. Druha a třeti kapitola se zabýva specifiky mužske a ženske identity. Ctvrta kapitola popisuje výzkumnou metodu obsahove analýzy a předklada cil výzkumu a stanovene hypotezy. Analyticka cast prace zkouma zobrazeni mužů a žen v televiznich reklamach ve dvou rovinach - v rovině hlavnich postav i v rovině reklam. Zavěrecna cast analyticke casti interpretuje zjistěne výsledky analýzy.