动词有一种不受主语限制的形式,叫做动词的非限定形式(Non- Finite Forms of the Verb)。这种形式不能独立作谓语．所以也叫非谓语动词．但可以和助动词或情态动词等构成谓语,还可以在句子中充当主语、宾语、定语、状语、表语等。其形...动词有一种不受主语限制的形式,叫做动词的非限定形式(Non- Finite Forms of the Verb)。这种形式不能独立作谓语．所以也叫非谓语动词．但可以和助动词或情态动词等构成谓语,还可以在句子中充当主语、宾语、定语、状语、表语等。其形式有三种:动名词、分词、不定式。中学英语教材从初中到高中都涉及非谓语动词的教学内容。尽管教师采取了分散难点、各个攻破的方法教学该语法项目,但学生仍然搞不清三种非谓语动词的区别,在学习、理解及运用此知识点时感到困难。展开更多
Based on field research data of farmers in Zhejiang Province, the authors analyzed factors influencing farmers' participation in forest farmers cooperatives (hereafter referred to as FFCs) by the binary logistic r...Based on field research data of farmers in Zhejiang Province, the authors analyzed factors influencing farmers' participation in forest farmers cooperatives (hereafter referred to as FFCs) by the binary logistic regression model. Results show that understanding of farmers about cooperatives has a great influence on their behavior of participation in FFCs. Besides, educational level of householders and existing member scale of cooperatives also have significant influence on farmers' behavior of participation in cooperatives. Therefore, it is required to strengthen propaganda of cooperatives, deepen their understanding of cooperatives; cultivate new high quality farmers to provide talents for development of cooperatives; establish incentive mechanism to encourage farmers to participate in cooperatives.展开更多
The initial forming of fiber blend to high green density, i.e. the packing of fibrous particles, is important to the reinforcement of composite materials. It is very useful to develop a general predictive method for t...The initial forming of fiber blend to high green density, i.e. the packing of fibrous particles, is important to the reinforcement of composite materials. It is very useful to develop a general predictive method for the optimum selection of particle mixtures for the property control of ceramie or composite products. This paper presents such a mathematical modei developed on the basis of the similarity analysis between the spherical and non-spherical particle packings and assesses its applicability to the packing of fibrous particles with discrete and/or continuous length distributions. The re-sults indicate that the modei can predict this packing system well and hence provide an effective way to solve various packing problems in the composite materials processing.展开更多
文摘动词有一种不受主语限制的形式,叫做动词的非限定形式(Non- Finite Forms of the Verb)。这种形式不能独立作谓语．所以也叫非谓语动词．但可以和助动词或情态动词等构成谓语,还可以在句子中充当主语、宾语、定语、状语、表语等。其形式有三种:动名词、分词、不定式。中学英语教材从初中到高中都涉及非谓语动词的教学内容。尽管教师采取了分散难点、各个攻破的方法教学该语法项目,但学生仍然搞不清三种非谓语动词的区别,在学习、理解及运用此知识点时感到困难。
基金Supported by the Project of Food and Agricultural Organization of the United Nations(GCP/CPR/038/200906)the Project of Zhejiang Province Forestry Department(07A13)
文摘Based on field research data of farmers in Zhejiang Province, the authors analyzed factors influencing farmers' participation in forest farmers cooperatives (hereafter referred to as FFCs) by the binary logistic regression model. Results show that understanding of farmers about cooperatives has a great influence on their behavior of participation in FFCs. Besides, educational level of householders and existing member scale of cooperatives also have significant influence on farmers' behavior of participation in cooperatives. Therefore, it is required to strengthen propaganda of cooperatives, deepen their understanding of cooperatives; cultivate new high quality farmers to provide talents for development of cooperatives; establish incentive mechanism to encourage farmers to participate in cooperatives.
文摘The initial forming of fiber blend to high green density, i.e. the packing of fibrous particles, is important to the reinforcement of composite materials. It is very useful to develop a general predictive method for the optimum selection of particle mixtures for the property control of ceramie or composite products. This paper presents such a mathematical modei developed on the basis of the similarity analysis between the spherical and non-spherical particle packings and assesses its applicability to the packing of fibrous particles with discrete and/or continuous length distributions. The re-sults indicate that the modei can predict this packing system well and hence provide an effective way to solve various packing problems in the composite materials processing.
