model n. 1.模型,雏型;原型;设计图;模范;(画家、雕刻家的)模特儿;样板。 2.典型,模范。 3.(女服装店雇用的)时装模特儿。 4.样式,型。 5.〔口语〕极相似的人[东西]。 adj. 模型的,模范的。 a clay model 【雕刻】黏土原型。 a working model 机器的运转模型。 a model shot 【摄影】模型镜头。 a model aeroplane 模型飞机。 a model test 典型试验。 The boy is the perfect model of his father. 这孩子活像他父亲。 after [on] the model of 仿效…,拿…当做模范。 stand model 做模特儿。(〔英国〕 -ll-) vt. 1.作…的模型[雏型]。 2.(依照模型)制作,仿造,建造 (after;on;upon)。 3.设计,仿照,拿…做模范。 vi. 做模型;做模特儿。 delicately modeled features 清秀的面貌。 model a garden after the manner of Kew 仿照(伦敦) Kew 植物园设计的花园。 model oneself up (on) sb.仿效某人。
To fulfill the requirement and characteristics of this track , which include paragraph - based and a relevant document supplied by user before retrieval , the rocchio model and vector model are merged to compute relevance between query and document . then , gradient decrease method is used to train the parameters of rocchio model . then , based on the paragraph - level relevance , the sorted documents are returned 本文针对文本检索大会子项目的要求和基于段落的,用户查询时可能提供一篇相关文章的查询特点,首先将rocchio模型和向量空间算法结合起来来把握用户需求并计算文档与查询的相关度,再使用梯度下降技术来训练模型中的参数,最后依据查询和段落层的相关度,使用基于段落切分的方法返回包含用户查询最相关文章。
On the other hand , the electric field and intensity distributions of the he11 mode in the hollow fiber are calculated by using the exact solutions of maxwell equations based on the vector model , and the diffracted near - and far - field distributions of the he11 - mode output beam under the fresnel approximation are studies . we derive an analytical expression on the far - field distribution of the he n - mode output beam in free space and discuss its applicable condition . we also analyze and compare the differences between the he11 - and lp01 - mode output beams , and find that the near - field distribution of the lpoi - mode output beam is a gaussian - like one , but the near - field distribution of the he11 - mode output beam is a doughnut - like one , whereas the far - field distribution of both the lp01 - and he11 - mode output beams are a doughnut one 此外,我们把中空光纤中lp _ ( 01 )模(标量模型)和he _ ( 11 )模(矢量模型)的场分布以及它们各自的输出光束的近场与远场分布进行了比较,发现两种模式的输出光束在近场分布有很大的区别, lp _ ( 01 )模输出光束在近场是一个高斯分布,而he _ ( 11 )模输出光束在近场是一个中空光束,在远场两种模式的输出光束分布是基本一致的,这正是由于在中空光纤中采用了弱波导近似以后所引起的误差。