加氧灌溉对超级稻“深优9516”生长及产量因素的影响研究

水稻在生长过程中根要进行有氧呼吸,加氧灌溉是根据作物生长中根对氧的需求状况下通氧。试验设计了机械加氧、化学加氧和不加氧3种处理,机械加氧A组又分6个处理小组,化学加氧B组又分3个处理小组。每个处理小组做3个重复试验然后取平均值分析。试验检测了超级稻根系和植株的若干生长农艺性状指标,得出两种加氧灌溉均能显著促进根系和植株的生长。其中机械加氧处理组A4组在实穗粒数上高于常规处理组37.6%,在千粒质量上高于常规处理组7.4%。研究结果为加氧灌溉技术在超级稻栽培上的应用提供了理论依据。     

一种新型管式曝气装置的设计与试验

随着水产养殖业逐渐向高密度、集约化方向的发展,为实现氧气(O_2)高效溶解、二氧化碳(CO_2)调控、流态改善等目的,急需研制新型高效曝气装置,开发高效节能的曝气技术。基于气水两相溶解的双膜理论和文丘里原理,设计开发了一种管式曝气装置,经初步试验获得了影响增氧性能的关键技术参数,并以此为基础对曝气装置进行优化设计,研究新型节能增氧技术。试验结果表明,管式曝气装置中影响曝气效果的因素有水面高程(Hw)、缩径(D_1/D_2)、旋混结构、进气口大小、进气量等。水面高程、缩径、进气口越大,进气量越充足,曝气装置的增氧效果越高;而额外增加延长结构和旋混结构后,曝气装置水头损失增大、进气量下降,从而导致增氧效果显著下降。该装置利用额外水流动力实现增氧,是一种高效、节能、经济的新型曝气装置,可为水产养殖提供一种新的增氧方法。     

Face Recognition Based on Weighted PCA

This paper proposes a face novel recognition method based on Weighted PCA, which combined weighted features with PCA. At first, we calculate the weighted subspace for each class by minimizing the weighted reconstruction error. Then a test example is classified by the distance from weighted subspace. The experiments on Cambridge ORL database show that our Weighted PCA method can improve the recognition rate significantly without increasing the computation, when compared with PCA.     

A face recognition method based on modular PCA and SVD

In order to solve the problem that modular PCA method is sensitive to translation, rotation and other geometric transform, a face recognition method based on modular PCA and singular value decomposition (SVD) is proposed. The PCA features of sub image and SVD features are extracted respectively. The distance measure that fuses information of modular PCA and SVD is obtained. Minimum distance classifier is used to face recognition. Experimental results on ORL human face database show that the proposed method can obtain higher recognition rate.     

颜色空间技术在证件照中人脸检测的应用

利用颜色空间技术,分离出彩色证件照中的肤色区域,并通过对肤色单元的判断,进一步确定肤色区域,最后根据人脸的先验知识,确定出人脸的位置。人脸检测方法直观,过程简单、高效,检测速度快,可用于大样本空间检测。实验结果表明,该方法有效可行。     

面子保全论与《红楼梦》

Brown与Levinson根据他们对言语行为的研究提出了他们的著名的面子保全理论。面子及对而子的需求在不同的文化中具有普遍性,因此本文根据而子保全论中的礼貌策略对著名的文化巨著红楼梦》中的言语行为进行了分析,并总结出其所用礼貌策略的不同文化内涵。     

A Solution to a Drafting Problem by Hypothetical Exchange

This paper proposes a drafting method for solving the intersection between circular elbow and elliptical conic pipe,which remains to be solved up to now and has not been mentioned in any textbooks.     

小柱面包络环面蜗杆齿面修形方法研究

分析并比较了用抛物线修形,变参数修形及三次我条曲线拟合美国样机实测数据修形前后蜗杆传动接触区和啮合性能的变化,从而证明抛物线修形比其它修形方法效果更好,为指导生产提供理论依据。