Evaluation for blast resistances of rice entries of 20th to 23rd International Rice Blast Nursery (IRBN) was conducted at CNRRI during 1990-1993. The resistance to seedling blast (SB) was evaluated in a greenhouse at ...Evaluation for blast resistances of rice entries of 20th to 23rd International Rice Blast Nursery (IRBN) was conducted at CNRRI during 1990-1993. The resistance to seedling blast (SB) was evaluated in a greenhouse at 3-4 leaf stage with artificial inoculation while resistance to leaf blast (LB) and neck blast (NB) were evaluated in the natural field as instructed by the International Network of Genetic Evaluation for Rice (INGER). Materials with high level of blast resistance and good agronomic traits were selected and展开更多
近年来,随着XML数据的爆炸式增长,对XML关键字查询技术的研究日益受到关注。数据编码是关键字查询的基础,目前主要有2种方式--基于路径的编码及区间编码。区间编码可更好地适应对查询中的XML数据进行动态的更新,因而具有更多的优势。本...近年来,随着XML数据的爆炸式增长,对XML关键字查询技术的研究日益受到关注。数据编码是关键字查询的基础,目前主要有2种方式--基于路径的编码及区间编码。区间编码可更好地适应对查询中的XML数据进行动态的更新,因而具有更多的优势。本文研究基于区间编码的关键字查询问题,提出一种新的查询算法。该算法首先根据预留的区间值建立索引,再根据最小范围值对索引进行选择遍历,减少了不必要的比较,达到了提高查询效率的目的。研究发现,预留空间的选择对查询效率有一定的影响。为此,本文设计一种基于节点自身进行区间预留的编码方式(Interval Reservation Based on Node, IRBN),为节点设置权值,并根据权值进行区间值的设定,形成根据节点自身分配区间的较为均衡的编码。实验表明,IRBN编码是合理的,有较高的查询效率。展开更多
文摘Evaluation for blast resistances of rice entries of 20th to 23rd International Rice Blast Nursery (IRBN) was conducted at CNRRI during 1990-1993. The resistance to seedling blast (SB) was evaluated in a greenhouse at 3-4 leaf stage with artificial inoculation while resistance to leaf blast (LB) and neck blast (NB) were evaluated in the natural field as instructed by the International Network of Genetic Evaluation for Rice (INGER). Materials with high level of blast resistance and good agronomic traits were selected and
文摘近年来,随着XML数据的爆炸式增长,对XML关键字查询技术的研究日益受到关注。数据编码是关键字查询的基础,目前主要有2种方式--基于路径的编码及区间编码。区间编码可更好地适应对查询中的XML数据进行动态的更新,因而具有更多的优势。本文研究基于区间编码的关键字查询问题,提出一种新的查询算法。该算法首先根据预留的区间值建立索引,再根据最小范围值对索引进行选择遍历,减少了不必要的比较,达到了提高查询效率的目的。研究发现,预留空间的选择对查询效率有一定的影响。为此,本文设计一种基于节点自身进行区间预留的编码方式(Interval Reservation Based on Node, IRBN),为节点设置权值,并根据权值进行区间值的设定,形成根据节点自身分配区间的较为均衡的编码。实验表明,IRBN编码是合理的,有较高的查询效率。
