一种实用的数字集群方案的研究

结合第二代移动通信系统GSM蜂窝网及陆地集群无线通信集群网提出了一种实用的数字集群移动通信方案．即采用TETRA系统的信源编解码和信道编解码技术，调制解调采用GsM蜂窝移动通信系统的GMSK技术，对国内成熟的模拟集群系统稍加改进，如将基带话音处理及载波调制数字化，就成为国内企业可批量生产的数字集群系统．并用硬件及软件对此方案进行了仿真，分析结果表明这是一种易于实现，性能良好的数字集群移动通信系统方案．     

长江下游陆生等足目的研究（Ⅱ）：南京陆生等足目记述

记述了采自南京陆生等足目，共７种，隶属４科４属，其中南京球形虫（Ｓｐｈｅｒｉｌｌｏｎａｎｊｉｎｅｎｓｉｓｓｐ．ｎｏｖ．）和老山气肢虫（Ｔｒａｃｈｅｌｉｐｕｓｌａｏｓｈａｎｅｎｓｉｓｓｐ．ｎｏｖ．）为新种，美丽卷甲虫（ＡｒｍａｄｉｌｌｉｄｉｕｍｐｉｃｔｕｍＢｒａｎｄｔ，１８３３）为新记录种．并对新种、新记录种的分类特征、生态习性作了描述和讨论．     

基于激光点云的树木三维几何建模系统的设计与实现

根据树木的几何拓扑原理,直接利用地面激光扫描仪扫描获得的活立木点云数据,提出了一种基于点云数据的树木三维高精度、真实感的快速重建技术,重点解决了树木骨架点的提取、枝条系统分级重建、模型交互式编辑等关键技术.应用结果表明,基于点云的树木三维几何建模系统能够克服传统树木建模精度低、效率低、形态逼真度差等不足,依据点云数据能快速高效地重建出忠实于现实树木形态结构的三维真实感模型.系统具有良好、灵活的交互性以及较强的实用性,可广泛应用于森林资源管理、精准农业、古树名木管理、园林规划设计等领域.     

中国典型地带陆生等足类的区系特点

通过对中国5个典型地带（热带、亚热带、暖温带、温带和高寒带）20个样点采集的72种陆生等足类的区系进行分析,发现具有以下特点：1.分布的地带性强,特有种多;2.东洋界热带,亚热带区系占主导地位;3.物种栖息生境多样;4.与日本区系进行比较发现其种级阶元的差异较大,其中在我国72种陆生等足类中有61种与日本不同,占总种数的84.7%.表明种类分布上具有极强的区系差别.     

Al-Zn-In-Ga-Si牺牲阳极合金在地热水中的电化学性能研究

对自行研制的Al-3.5wt% Zn -0.02 wt% In- 0.02 wt% Ga-0.15 wt%Si牺牲阳极合金在不同温度地热水中的电化学性能进行了测试研究,为地热井完井筛管的电化学保护提供了设计计算依据。     

Current status of an amphipod invader,Arcitalitrus dorrieni (Hunt, 1925), in Britain

The synanthropic landhopper Arcitalitrus dorrieni (Hunt) is largely restricted to the south-west of Britain although there are isolated populations outside this area. It has been recorded from 60 new 10-km squares since Harding and Sutton (1988 Harding, P. T and Sutton, S. L. 1988. The spread of the terrestrial amphipod Arcitalitrus dorrieni in Britain and Ireland: watch this niche!. Isopoda, 2: 7–10.  [Google Scholar]) last reviewed its distribution. Some of the new records, particularly in south Wales, could be interpreted as meaning that there has been range expansion in this time. However, the evidence is equivocal. It was not possible to explain the distribution of A. dorrieni in terms of association with native plant species. The main means of dispersal still seems to be synanthropic. Arcitalitrus dorrieni has retained a mainly coastal distribution, with penetration inland restricted to peninsular areas (with some notable exceptions, e.g. populations in London).     

Revision of the smiling worms,genera Prosadenoporus Bürger, 1890 and Pantinonemertes Moore and Gibson, 1981 and description of a new species Prosadenoporus floridensis sp. nov. (Prosorhochmidae; Hoplonemertea; Nemertea) from Florida and Belize

The hoplonemertean genera Prosadenoporus Bürger, 1890 Bürger, O. 1890. Untersuchungen über die anatomie und histologie der nemertinen nebst beiträgen zur systematik [Studies of anatomy and histology of nemerteans with contribution to systematics].. Z Wiss Zool., 50: 1–277. German [Google Scholar] and Pantinonemertes Moore and Gibson, 1981 Moore, J. and Gibson, R. 1981. The Geonemertes problem (Nemertea).. J Zool., 194: 175–201.  [Google Scholar] are revised and synonymized based on a morphological re‐evaluation. We redefine Prosadenoporus Bürger, 1890 Bürger, O. 1890. Untersuchungen über die anatomie und histologie der nemertinen nebst beiträgen zur systematik [Studies of anatomy and histology of nemerteans with contribution to systematics].. Z Wiss Zool., 50: 1–277. German [Google Scholar] on the basis of characters held in common by the eight species: Prosadenoporus agricola (Willemoes‐Suhm, 1874 Willemoes‐Suhm, R. 1874. On a land‐nemertean found in the Bermudas.. Ann Mag Nat Hist. Ser 4., 13: 409–411.  [Google Scholar]) comb. nov., Prosadenoporus arenarius Bürger, 1890 Bürger, O. 1890. Untersuchungen über die anatomie und histologie der nemertinen nebst beiträgen zur systematik [Studies of anatomy and histology of nemerteans with contribution to systematics].. Z Wiss Zool., 50: 1–277. German [Google Scholar], Prosadenoporus spectaculum (Yamaoka, 1940 Yamaoka, T. 1940. Two nemerteans from the Riukiu Islands.. Annot Zool Japon., 19: 13–18.  [Google Scholar]) comb. nov., Prosadenoporus winsori (Moore and Gibson, 1981 Moore, J. and Gibson, R. 1981. The Geonemertes problem (Nemertea).. J Zool., 194: 175–201.  [Google Scholar]) comb. nov., Prosadenoporus enalios (Moore and Gibson, 1981 Moore, J. and Gibson, R. 1981. The Geonemertes problem (Nemertea).. J Zool., 194: 175–201.  [Google Scholar]) comb. nov., Prosadenoporus mooreae (Gibson, 1982b Gibson, R. 1982b. Nemerteans of the Great Barrier Reef. 5. Enopla Hoplonemertea (Monostilifera).. Zool J Linn Soc., 75: 269–296.  [Google Scholar]) comb. nov., Prosadenoporus mortoni (Gibson, 1990 Gibson, R. 1990. “The macrobenthic nemertean fauna of Hong Kong.”. In The Marine Flora and Fauna of Hong Kong and Southern China, Edited by: Morton, B. 33–212. Hong Kong: Hong Kong University Press.  [Google Scholar]) comb. nov. and Prosadenoporus fujianensis (Sun, 2001 Sun, S. 2001. A new mangrove‐dwelling nemertean from China.. Hydrobiologia, 456: 199–209.  [Google Scholar]) comb. nov. We describe a new semi‐terrestrial species Prosadenoporus floridensis sp. nov. from Belize and Florida and compare its morphology to other species of Prosadenoporus. The average sequence divergence of P. floridensis sp. nov. from other congeners is 9.15% (16S) and 10.65% (COI) and 7.8% and 10.3% respectively from the nearest sequenced congener P. mortoni.     

TDS-OFDM系统中的差分空频发射分集方法

在采用相干检测方法的发射分集方案中,进行信道估计需要付出很高的代价,为了降低接收端的实现复杂度,根据时域同步正交频分复用(TDS-OFDM)系统结构的特点,提出了差分空频发射分集及相应的非相干检测方法。该方法在时域进行差分编码,而在频域进行空频编码以获得分集增益。理论分析和仿真结果表明,尽管非相干检测方法损失了一定的接收性能,但无需进行信道估计,在慢衰落和快衰落信道中均能适用,是一种比较好的实现复杂度与接收性能之间的折衷方法。     

地面三维激光扫描点云配准的最佳距离

分析点云配准的原理,在此基础上推导出点云配准误差传播模型.利用该模型解算了配准后的点位误差,将该误差作为衡量点云配准好坏的指标.为评估地面三维激光扫描测距的变化给点云配准误差造成的影响,设计了一套试验方案,在地面三维激光扫描仪测距精度内对不同距离进行了严格的试验.根据提取的靶心和点云配准误差传播模型,计算得出不同距离下的点云配准精度,从而分析得出点云配准精度的扫描最佳距离.结果表明点云误差传播模型正确,试验方法良好.     

暖温带北京小龙门林区土壤腹足类物种多样性研究

作者于1993年4月-1994年1月在北京小龙门森林生态定位站对土壤腹足类按不同土壤层位、不同月份进行了初步调查,对所获标本进行鉴定、统计。共获土壤腹足类标本282号,隶属于2亚纲(前鳃亚纲和肺螺亚纲)、2目、9科、10属、14种。对不同月份取样环境的土壤腹足类进行物种多样性分析,结果表明暖温带北京小龙门土壤腹足类物种多样性低,群落结构较简单。对取样区内的土壤温度、含水量与土壤腹足类物种多样性进行相关分析,初步看出该地区土壤温度、含水量与土壤腹足类物种多样性之间不存在相关性。