一种基于区域生长算法的脊椎椎体提取方法

脊椎椎体三维重建是脊椎应力应变研究的重要环节,对MRI图像中脊椎椎体区域的提取是三维重建的基础。为了准确提取脊椎椎体区域,提出了一种基于区域生长算法的脊椎椎体提取方法。通过最大类间方差法求得到自适应阈值代替传统区域生长算法中的手动阈值,再结合中值滤波算法对原始图像进行预处理,避免了传统区域生长算法手动阈值造成的过分割,或者欠分割等现象;并有效抑制MRI图像噪声,使椎体区域内像素变化更为缓和,弥补了传统区域生长在MRI图像椎体区域内部分割效果不佳的缺陷,准确提取出脊椎椎体并建立出三维模型。     

Revision of Afrotropical Chonocephalus Wandolleck (Diptera: Phoridae)

Chonocephalus justini sp. nov., C. modestus sp. nov. and C. pudicus sp. nov. are described from the Seychelles; C. cummingae sp. nov. is described from Madagascar, South Africa and Zimbabwe; and C. cautus sp. nov. and C. steineri sp. nov. from Madagascar. C. dimakae Paulian is synonymized with C. depressus Meijere. A key to males and a partial key to the females of the 14 Afrotropical species are provided.     

新疆科技档案管理现状及发展对策

分析了当前新疆科技档案管理中存在的主要问题,介绍了有关省市科技档案管理工作的成功经验,提出了建立和完善新疆科技档案管理的对策。     

三峡库区重庆段人口与经济空间耦合分布研究

基于三峡库区重庆段22个区县1997-2011年人口和GDP数据,计算各区县的人口地理集中度、经济地理集中度和二者的耦合指数,分析三峡库区重庆段各区县人口和经济集聚特征,人口与经济耦合类型,并在Geoda软件支持下对各区县人口与经济耦合指数进行全局空间自相关分析和局部空间自相关分析.研究结果表明,三峡库区重庆段人口地理集中度和经济地理集中度均呈现出西南高东北低的分布特点;根据人口与经济地理集中度耦合指数将三峡库区重庆段22个区县划分为人口集聚超前于经济集聚、人口集聚与经济集聚协调发展、人口集聚滞后于经济集聚等3种划分类型;全局空间自相关分析表明1997-2011年研究区人口与经济空间耦合具有较高空间集聚特征但呈下降趋势;局域空间自相关分析进一步表明研究区局域集聚程度也较高,并且空间集聚主要分布在重庆主城和研究区东北部.重庆主城由于地理位置优越,交通便捷,故而经济发展水平较高且人口集聚程度高;研究区东北部地理环境较差,交通不便,产业结构单一,故而经济发展水平较低且人口集聚程度低.为了降低三峡库区重庆段人口与经济空间集聚的不均匀程度,建议调整产业政策向研究区东北区域倾斜以促进当地产业经济发展和人口的回流;并且研究区东北区域也应抓住自身优势大力发展优势产业.同时还可采取改善重庆主城至研究区东北区域的交通条件等措施.     

Shenzhousia qilianshanensis gen. et sp. nov. (Protodonata, Meganeuridae), a giant dragonfly from the Upper Carboniferous of China

A new dragonfly of family Meganeuridae Shenzhousia qilianshanensis gen. et sp. nov., discovered from Ningxia Hui Autonomous Region in North China, is described in the present paper. It has an estimated wingspan of about 450-500mm and may be the largest fossil insect in Late Carboniferous Namurian Stage discovered by far. The new species is referred to Meganeuridae because of the presence of the characteristic oblique vein between anterior branch of radius (RA) and posterior branch of radius (RP) near the base of RP2. It differs from other genera within the family in the following characteristics: Precostal area short and not extending to the midwing; posterior branch of subcostal vein short, merging into costal vein near the level of originating point of IR2; RP forking earlier than anterior branch of media basally; RP1+2 and RP3+4 parallel and close to each other for a long distance, and then diverge gradually surpass midwing.     

对西部地区循环经济发展的思考

对于在生态环境相对比较脆弱的西部地区而言,发展循环经济是打破旧有发展模式、实现资源永续利用、保护生态环境的重大战略选择。资源因素、环境因素、经济因素和政策因素等都影响着其发展的趋势、方向及进程。要通过发展循环经济实现可持续发展,需要政府、企业和社会各界的共同努力,同时也需要资金、技术以及法规、制度等软硬环境的强有力支撑。     

广西境内热带北界的AHP—FUZZY综合评判

运用层次分析法（ＡＨＰ）和模糊数学中ＦＵＺＺＹ综合评判原理，分别计算了广西境内主要县（市）气候因子的模糊综合评侩综合评价值Ｂ０．５的等值线作为热带与亚热带的分界线，亦即广西境内热带北界。结果表明，广西境内热带北界大致是东起梧州市北部，沿大瑶山南部，经武宣来宾与合山南部，忻城，都安北部，巴马，田林，西对右江与西洋汇交汇处。综合评判结果与天然植被，动物、栽培作物等景观特征相吻合。     

环渤海地区环境污染问题演化及其对策

环渤海地区是我国经济增长的第三极。随着该地区工农业生产的迅速发展和新型产业的崛起,其环境污染问题日益突出。本文从环渤海地区水体污染、大气污染和土壤环境污染三个角度,对该地区环境污染问题的演化进行了宏观意义上的分析和预测,并据此提出了解决该地区环境污染问题的对策措施。     

Description of the immature stages of Sigara (Tropocorixa) santiagiensis (Hungerford, 1928) (Insecta: Heteroptera: Corixidae)

The immature stages of Sigara santiagiensis are described and illustrated for the first time. The eggs of Sigara can be distinguished by the chorionic surface. The main characters separating the five nymphal instars of S. santiagiensis are: body and head lengths; body, head and eye widths; ocular index; numbers of transverse sulcations of the rostrum, setae on the inner surface of protibiotarsus, campaniform sensilla on posterior surface of protrochanter, spines on posteroventral surface of mesotibia and on tibial comb of metaleg, long, slender setae on posterodorsal surface of mesotarsus, spines and swimming hairs on anteroventral and posterodorsal surfaces of metatarsus; and grade of development of the wing pads. The body length, the chaetotaxy of the mesonotum, profemora and metafemora, protibiotarsus, metatibia, metatarsus and urosternites distinguish species or group of species of instars I and V of some of the species of the genus Sigara described up to now.     

Morphometry and chaetotaxy of the nymphs of Ectemnostega (Ectemnostegella) quechua (Bachmann 1961) (Insecta: Hemiptera: Heteroptera: Corixidae)

The egg and the five nymphal instars of Ectemnostega quechua are described and illustrated for the first time. The eggs of Ectemnostega have a short stalk, and the shape, size and chorionic structure differ among groups of species. The nymphal characters most useful in identifying instars I–V of Ectemnostega are: body length; number of rostrum sulcations; number of setae on inner surface of protibiotarsus; spines and setae, and spines on posteroventral surface of mesofemur and mesotibia, respectively; setae on posterodorsal surface of mesotibia and mesotarsus; spines and setae on anteroventral surface and setae on posterior surface of metatibia; swimming hairs on anteroventral and posterodorsal surfaces of metatarsus; and the grade of development of wing pads. The nymphs of E. quechua can be easily distinguished from other species of Ectemnostega by the number of spines and setae on the posteroventral surface of mesofemur.