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勾股定理、正弦定理、余弦定理、射影定理的等价链 被引量:1
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作者 甘大旺 《数学教学通讯》 2018年第21期76-77,共2页
用余弦定理推导正弦定理,用正弦定理推导勾股定理,用勾股定理推导余弦定理,用正%%%弦定理推导射影定理,用射影定理推导余弦定理,于是只用五个推导环节就完成勾股定理、正弦定理、余弦定理、射影定理的两两等价性证明,其逻辑思路令人耳... 用余弦定理推导正弦定理,用正弦定理推导勾股定理,用勾股定理推导余弦定理,用正%%%弦定理推导射影定理,用射影定理推导余弦定理,于是只用五个推导环节就完成勾股定理、正弦定理、余弦定理、射影定理的两两等价性证明,其逻辑思路令人耳目一新. 展开更多
关键词 教材开发 等价 向导链
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Sustainability and Market Orientation in the Brazilian Beef Chain
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作者 Miguelangelo Gianezini Julio Otavio Jardim Barcellos +2 位作者 Clandio Favarini Ruviaro Tamara Esteves de Oliveira Homero Dewes 《Journal of Agricultural Science and Technology(B)》 2014年第4期249-260,共12页
The demand for natural resources, energy and food facing the contemporary perception of sustainability is imposing challenges to the productive sectors in accordance with market guidelines. In this context, the Brazil... The demand for natural resources, energy and food facing the contemporary perception of sustainability is imposing challenges to the productive sectors in accordance with market guidelines. In this context, the Brazilian agribusiness seeks to maintain external competitiveness and to satisfy growing domestic demands. In beef production, this competitiveness pervades traceability, food safety and sustainability. This article aims to identify the sustainability state of the art in agribusiness and characterize it within the Brazilian beef chain. Descriptive methodology, combining a literature review and a documentary data survey were adopted. An outline of the dimensions of agribusiness sustainability, drawn from benchmark practices, indicates that environmental, social and technological demands have become part of the industry's agenda. The data for beef cattle point to a growth in production but demonstrate that expansion has occurred in areas of environmental tension, which creates a demand for sustainability in the beef chain. A table of guidelines for sustainability demonstrates that although perceptions are not yet harmonized among the links in the whole beef chain, many of the technological guidelines for sustainable production may increase the producer's economic efficiency. In the Brazilian case, the increment of initiatives and dissemination of sustainable practices among the beef chain is desirable to provide a coordinated response of production, processing and distribution organizations facing market opportunities for sustainable livestock. 展开更多
关键词 Agribusiness LIVESTOCK PROCESS sustainable production demand chains.
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Perspectives of the Brazilian Poultry Industry for the Chinese Consumer Market
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作者 Cesar Augustus Winck Miguelangelo Gianezini +2 位作者 Clandio Favarini Ruviarot Joao Armando Dessimon Machado Homero Dewes 《Journal of Food Science and Engineering》 2012年第1期24-37,共14页
The objective of this article was to analyze the poultry and derivatives commerce between Brazil and China, taking into account the current market and the perspectives for the next years. The method used was the bibli... The objective of this article was to analyze the poultry and derivatives commerce between Brazil and China, taking into account the current market and the perspectives for the next years. The method used was the bibliographic review and analysis of secondary data from different sources, associated with the Market Orientation Theory and the Value Chain Theory. Nowadays, China is Brazil's main commercial partner in the international market, but taking into account the chicken meat and its derivatives, having Brazil as the first worldwide exporter and China, the second largest consumer, an effective commercial relationship has not been established yet. To understand the poultry market exchanges between Brazil and China, a framework was built to demonstrate the characteristics and factors found to influence country negotiations, considering current reality and future perspectives. Considering the Theory of Market Orientation, it is concluded that Brazil has effective conditions to consolidate itself as a major supplier of chicken meat and derivatives to China, because it shows determinant characteristics and market factors that allows the association of the national poultry value chain to the demands of the Chinese consumers, but some adjustments are needed in the sphere of international politics. 展开更多
关键词 Chicken meat market orientation Brazil China agribusiness.
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