On the identity of Pterodectes ralliculae Atyeo and Gaud, 1977 (Astigmata: Proctophyllodidae)

Natural history data on snakes collected in situ are scarce because of the great sampling effort required to record individuals with methods that do not interfere with their activities (e.g. visual surveys). We collected data on relative abundance and natural history, including records of ingested prey, microhabitat use, and behaviour of a snake assemblage along transects marked alongside a river in south-eastern Brazil. We recorded eight species from two families, Viperidae and Dipsadidae using visual searches over 12 months. We quantified available microhabitats in the sampled transects and used electivity indices to determine preferred microhabitats for the pit viper Bothrops moojeni, the most frequent species. Several species of snakes use riverside habitats where they can find food and suitable microhabitats, even in areas that are not pristine, adding to the importance of preserving the remaining riverside vegetation and habitat structure in such areas.     

基于模型匹配人脸识别的研究

提出了基于模型匹配的人脸识别方法.利用人的脸部特征规律建立一个立体可调的模型框架,在定位出人的脸部位置后用模型框架定位和调整人的脸部特征部位,着重于解决人脸识别过程中的观察角度、遮挡和表情变化等因素影响.     

黔南苗族板羽毽的传承与发展探究

黔南州苗族板羽毽具有很强的苗族特色和丰富的文化底蕴。本文采用文献资料法、实地考察法和逻辑推理法等对板羽毽的传承与发展进行探讨，并提出板羽毽科学发展的路径。     

基于最大熵模型的垃圾邮件过滤技术

主要介绍如何建立最大熵模型以及应用最大熵模型实现垃圾邮件过滤的基本原理和方法．     

矮脚黄羽肉鸡的精液冷冻研究

对矮脚黄羽肉鸡,运用采集精液进行研究,其方法为人工徒手按摩其背、以尾部可以采得精液．对其品质进行测试表明:采精量平均0．512±0．316 mL(变动范围0．3-0．8 mL);精液似浓稠的牛乳状,每毫升精液中精子数17-19亿个,活力9级以上,pH值6．5,微腥．采出的鲜精,用2号 (3％柠檬酸三钠-卵黄稀释液)、3号(11％蔗糖-卵黄稀释液)、5号(11％蔗糖-0．1％柠檬酸三钠-卵黄稀释液)稀释液稀释,精子活力都8-9级,以5号液最好．即11％蔗糖-0．1％柠檬酸三钠溶液 100 mL中,加6 mL甘油,加16 mL鲜卵黄．与原精液做1:1稀释后用水浴套或毛巾包裹,直接放入5℃冰箱中平衡1 h后装入0．25 mL塑料细管,吊入液氮(-196℃)中冻存．在50℃温水中解冻后,精子活力在9级以上．其冻精稀释液以5号最佳．精子活力达6-7级．8号液(5％葡萄糖溶液 77 mL中加入甘油6 mL,鲜卵黄17 mL),3号液(11％柠檬酸三钠溶液100 mL中加6 mL甘油,16 mL鲜卵黄)也较好,冻精复苏后,活力达5-6级．     

20种鸟类绒羽羽小枝的显微结构研究

选择20种（鸡形目雉科10种和不同目10种）鸟羽，观察分析它们绒羽羽小枝的显微结构。结果表明：（1）雉科10种绒羽羽小枝形态变化甚小；（2）不同目10种绒羽羽小枝在节间长度、节的直径以及节的形态、色素分布等变化很大，这些差异可以作为鸟类的分类依据。     

Effects of serotonin and ketanserin on the functional morphology of chick down feather bulbi in vitro

Summary Chick feather bulbi cultured in vitro showed an increased DNA synthesis and a delayed keratinization after treatment with ketanserin, a serotonin₂ antagonist with wound-healing properties. In contrast, serotonin stimulates keratinization of the keratinocytes in the bulbus.     

室内火灾的计算机模拟

建立室内火灾的区域模型，作气体浓度均匀、冷热空气层不连续、室内外等压的相关假设。分析模型根据质量守恒、能量守恒等经典理论进行理论分析，推导计算机编程所需的相关公式和理论依据。利用对象编程的思想以VB作为工具进行程序开发，给出相关的编程思路和计算流程图。利用一个消防研究所的实验数据进行程序正确性的验证。     

A new species of the genus Coraciacarus (Gabuciniidae,Pterolichoidea) from the huia Heteralocha acutirostris (Callaeatidae,Passeriformes), an extinct bird species from New Zealand

We describe one new feather mite species Coraciacarus muellermotzfeldi sp. nov. (Acari, Astigmata) found as dried corpses on the feathers of the museum skin of the huia Heteralocha acutirostris (Gould, 1837 Gould, J. 1837. A synopsis of the birds of Australia, and the adjacent islands, Vol. I, London: Gould. 11 p1.  [Google Scholar]) (Passeriformes, Callaeatidae). This endemic New Zealand passerine bird is believed to have been extinct since the beginning of the twentieth century. Comments on the systematic position of the new species within the genus Coraciacarus are presented. A key to all known species and subspecies of the genus is provided. The unusually wide host range of Coraciacarus is discussed. The presence of a representative of this genus on a passerine bird is an enigmatic phenomenon. It might be the result of horizontal transfer from cuckoos (Cuculiformes) rather than ancient co‐phylogenesis but this hypothesis is only weakly supported by currently available data.     

Six new feather mite species (Acari: Astigmata) from the carolina parakeet Conuropsis carolinensis (Psittaciformes: Psittacidae), an extinct parrot of North America

We describe six new feather mite species collected from museum skins of the carolina parakeet Conuropsis carolinensis Linnaeus, 1758, which lived in North America and became extinct at the beginning of the 20th century: Genoprotolichus simplex sp. n., Lopharalichus beckeri sp. n., Neorhytidelasma conuropsis sp. n. (Pterolichidae: Pterolichinae), Chiasmalges carolinensis sp. n. (Psoroptoididae: Pandalurinae), Fainalges gracilitarsus sp. n., and Protonyssus proctorae sp. n. (Xolalgidae: Ingrassiinae). Brief comments on the current systematic state and host associations of these feather mite genera are provided.