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Author: Jos V. Ctor Galaviz
Publisher: Palibrio
ISBN: 146331809X
Category : Technology & Engineering
Languages : en
Pages : 81
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Book Description
Debido a que los resultados del análisis de uniformidad de temperatura del deshidratador convencional no fueron los óptimos, se procedió a diseñar y construir un nueva deshidratador con materiales refractarios con la finalidad de uniformizar la temperatura y mejorar los tiempos de proceso. Los materiales refractarios que se utilizaron fueron el vidrio blanco de 6 mm de espesor y una cama de poliuretano (10cm), debido a su bajo coeficiente de conductividad térmica. Se realizó un análisis estadístico en una prueba ANOVA a un nivel de significancia de 0.5%, donde se hizo una comparación de las medias muéstrales y una comparación de las varianzas de cada uno de los tratamientos, el cual se encontró que la construcción del nuevo deshidratador con materiales refractarios tuvo un comportamiento de uniformidad en las temperaturas a un 95% de confianza. Cabe destacar que la temperatura promedio del deshidratador convencional fue de 38.61°C, mientras que con el nuevo deshidratador construido con materiales refractarios se logró incrementar a 57.43°C, destacando que esta temperatura se logró uniformizar en las tres áreas analizadas del deshidratador. Esto significó un incremento de temperatura con respecto al deshidratador solar convencional de un 48.74%
Author: Jos V. Ctor Galaviz
Publisher: Palibrio
ISBN: 146331809X
Category : Technology & Engineering
Languages : en
Pages : 81
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Book Description
Debido a que los resultados del análisis de uniformidad de temperatura del deshidratador convencional no fueron los óptimos, se procedió a diseñar y construir un nueva deshidratador con materiales refractarios con la finalidad de uniformizar la temperatura y mejorar los tiempos de proceso. Los materiales refractarios que se utilizaron fueron el vidrio blanco de 6 mm de espesor y una cama de poliuretano (10cm), debido a su bajo coeficiente de conductividad térmica. Se realizó un análisis estadístico en una prueba ANOVA a un nivel de significancia de 0.5%, donde se hizo una comparación de las medias muéstrales y una comparación de las varianzas de cada uno de los tratamientos, el cual se encontró que la construcción del nuevo deshidratador con materiales refractarios tuvo un comportamiento de uniformidad en las temperaturas a un 95% de confianza. Cabe destacar que la temperatura promedio del deshidratador convencional fue de 38.61°C, mientras que con el nuevo deshidratador construido con materiales refractarios se logró incrementar a 57.43°C, destacando que esta temperatura se logró uniformizar en las tres áreas analizadas del deshidratador. Esto significó un incremento de temperatura con respecto al deshidratador solar convencional de un 48.74%
Author: Laura E. Powers
Publisher: Cengage Learning
ISBN:
Category : Business & Economics
Languages : en
Pages : 468
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Book Description
Introduction to ecology and ecological principles for agricultural students with no prior coursework in ecology.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251091870
Category : Social Science
Languages : en
Pages : 37
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Book Description
The understanding that some pesticides are more hazardous than others is well established. Recognition of this is reflected by the World Health Organization (WHO) Recommended Classification of Pesticides by Hazard, which was first published in 1975. The document classifies pesticides in one of five hazard classes according to their acute toxicity. In 2002, the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) was introduced, which in addition to acute toxicity also provides classification of chemicals according to their chronic health hazards and environmental hazards.
Author: Miguel Leon-Portilla
Publisher: University of Oklahoma Press
ISBN: 0806181346
Category : Social Science
Languages : en
Pages : 340
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Book Description
He was sent from Spain on a religious crusade to Mexico to “detect the sickness of idolatry,” but Bernardino de Sahagún (c. 1499-1590) instead became the first anthropologist of the New World. The Franciscan monk developed a deep appreciation for Aztec culture and the Nahuatl language. In this biography, Miguel León-Portilla presents the life story of a fascinating man who came to Mexico intent on changing the traditions and cultures he encountered but instead ended up working to preserve them, even at the cost of persecution. Sahagún was responsible for documenting numerous ancient texts and other native testimonies. He persevered in his efforts to study the native Aztecs until he had developed his own research methodology, becoming a pioneer of anthropology. Sahagún formed a school of Nahua scribes and labored with them for more than sixty years to transcribe the pre-conquest language and culture of the Nahuas. His rich legacy, our most comprehensive account of the Aztecs, is contained in his Primeros Memoriales (1561) and Historia General de las Cosas de Nueva España (1577). Near the end of his life at age 91, Sahagún became so protective of the Aztecs that when he died, his former Indian students and many others felt deeply affected. Translated into English by Mauricio J. Mixco, León-Portilla’s absorbing account presents Sahagún as a complex individual–a man of his times yet a pioneer in many ways.
Author: Gary Paul Nabhan
Publisher: University of Arizona Press
ISBN: 9780816522590
Category : Social Science
Languages : en
Pages : 260
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Book Description
As biological diversity continues to shrink at an alarming rate, the loss of plant species poses a threat seemingly less visible than the loss of animals but in many ways more critical. In this book, one of America's leading ethnobotanists warns about our loss of natural vegetation and plant diversity while providing insights into traditional Native agricultural practices in the Americas. Gary Paul Nabhan here reveals the rich diversity of plants found in tropical forests and their contribution to modern crops, then tells how this diversity is being lost to agriculture and lumbering. He then relates "local parables" of Native American agriculture—from wild rice in the Great Lakes region to wild gourds in Florida—that convey the urgency of this situation and demonstrate the need for saving the seeds of endangered plants. Nabhan stresses the need for maintaining a wide gene pool, not only for the survival of these species but also for the preservation of genetic strains that can help scientists breed more resilient varieties of other plants. Enduring Seeds is a book that no one concerned with our environment can afford to ignore. It clearly shows us that, as agribusiness increasingly limits the food on our table, a richer harvest can be had by preserving ancient ways. This edition features a new foreword by Miguel Altieri, one of today's leading spokesmen for sustainable agriculture and the preservation of indigenous farming methods.
Author: Paul Gepts
Publisher: Cambridge University Press
ISBN: 110737667X
Category : Nature
Languages : en
Pages :
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Book Description
The introduction of plant and animal agriculture represents one of the most important milestones in human evolution. It contributed to the development of cities, alphabets, new technologies, and ultimately to civilizations, but it has also presented a threat to both human health and the environment. Bringing together research from a range of fields including anthropology, archaeology, ecology, economics, entomology, ethnobiology, genetics and geography, this book addresses key questions relating to agriculture. Why did agriculture develop and where did it originate? What are the patterns of domestication for plants and animals? How did agroecosystems originate and spread from their locations of origin? Exploring the cultural aspects of the development of agricultural ecosystems, the book also highlights how these topics can be applied to our understanding of contemporary agriculture, its long-term sustainability, the co-existence of agriculture and the environment, and the development of new crops and varieties.
Author: Kim Rygiel
Publisher: UBC Press
ISBN: 0774859482
Category : Political Science
Languages : en
Pages : 275
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Book Description
Since 9/11, national governments in the global North have struggled to govern populations and manage cross-border traffic without building new barriers to trade. What does citizenship mean in an era of heightened tension between global capitalism and the nation-state? Building on Foucault's concept of biopolitics and an examination of national border and detention policies, Rygiel argues that citizenship is becoming a globalizing regime to govern mobility. The new regime is deepening boundaries based on race, class, and gender, and causing Western nations to embrace a more technocratic, depoliticized understanding of citizenship.
Author: Wan Azlina Ahmad
Publisher: Springer Science & Business Media
ISBN: 364224520X
Category : Science
Languages : en
Pages : 84
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Book Description
Environmental concerns regarding continuous use of synthetic dyes saw a revival in the demand for natural dyes as natural dyes exhibit better biodegradability and generally have a higher compatibility with the environment. However, one of the limitations on the use of natural dyes or pigments is the low extraction yield factors (a few grams of pigment per kg of dried raw material). Therefore, the exploitation of other biological sources such as fungi, bacteria and cell cultures offers interesting alternative. Microbial pigments such as from bacterial origins offer the advantage in terms of production compared to pigments extracted from vegetables or animals, due to its simple cell and fast culturing technique. This book offers interesting insight into initial works carried out to demonstrate the potential use of bacterial pigment as colorant for various applications.
Author: Tanya Basok
Publisher: McGill-Queen's Press - MQUP
ISBN: 9780773523876
Category : Business & Economics
Languages : en
Pages : 196
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Book Description
Based on interviews with Leamington greenhouse growers and migrant Mexican workers, Tanya Basok offers a timely analysis of why the Seasonal Agricultural Workers Program is needed. She argues that while Mexican workers do not necessarily constitute cheap labour for Canadian growers, they are vital for the survival of some agricultural sectors because they are always available for work, even on holidays and weekends, or when exhausted, sick, or injured. Basok exposes the mechanisms that make Mexican seasonal workers unfree and shows that the workers' virtual inability to refuse the employer's demand for their labour is related not only to economic need but to the rigid control exercised by the Mexican Ministry of Labour and Social Planning and Canadian growers over workers' participation in the Canadian guest worker program, as well as the paternalistic relationship between the Mexican harvesters and their Canadian employers.
Author: Alexandra Daisy Ginsberg
Publisher: MIT Press
ISBN: 026201999X
Category : Art
Languages : en
Pages : 372
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Book Description
As synthetic biology transforms living matter into a medium for making, what is the role of design and its associated values?
