关于主理想整环上有限生成模的自同态环的一个结构定理

[1]中给出主理想整环上有限生成模的自同态环的一个结构定理。其证明过程有一处疏误。本文更正了[1]的证明。     

与畴界有关的介电损耗、介电常数和内耗研究Ⅱ.理论部分

提出了畴界与外场、晶格及缺陷间的互作用模型以及畴界间的互作用模型,并在该模型基础上,系统地解释了与畴界运动有关的介电损耗、介电常数的和内耗(f=1KHz～10KHz)。本文还对介电损耗的理论和实验结果进行了比较     

南大西洋、南印度洋冷空气活动的统计分析

采用 NCEP1 995～ 1 997年逐日 2 .5°× 2 .5°经纬网格点再分析资料 ,统计分析了 70 0 h Pa逐日 2 4 h变温分布和演变特征 ,讨论了影响南大西洋、南印度洋冷空气源地、路径和季节变化特征 ,以及冷空气活动与大气环流背景之间的关系 ,提出了影响南大西洋和南印度洋冷空气活动的天气过程模型     

填埋场裸膜红外巡检机器人最优路径规划

针对垃圾填埋场渗漏检测问题,提出了使用红外巡检机器人代替人工对垃圾填埋场裸膜进行全覆盖巡检的方法,并对机器人进行路径规划。首先,根据垃圾填埋场环境,采用矩形分解法对其进行区域分解,生成若干子区域;然后,用模板模型法规定机器人遍历各个子区域方式;最后,基于遗传算法,对其流程算法进行改进优化包括选择、交叉、变异等,实现各子区域间的转换连接,进而实现全覆盖最优路径规划。基于MATLAB仿真分析,结果表明：将改进的遗传算法与模板模型法相结合构成了一个成熟完整的全覆盖路径规划模型,能高效地完成巡检任务,并有较快的收敛速度和较低的重复覆盖率。     

基于SVM-RFE和粒子群优化算法的恶意域名检测模型

域名解析作为网络建立连接的第一个步骤,对恶意域名进行快速识别是阻断异常网络行为的有效措施。本研究利用机器学习和随机搜索算法,提出了一种基于SVM-RFE和粒子群优化算法的恶意域名检测模型。分析域名字符特征、解析特征和注册特征,使用SVM-RFE算法进行特征权重排序,通过优化的粒子群算法确定最佳SVM参数和特征选择。实验证明该检测模型具有较好的效率和准确度。     

Calanoides natalis Brady, 1914 (Copepoda: Calanoida: Calanidae): identity and distribution in relation to coastal oceanography of the eastern Atlantic and western Indian Oceans

Until recently, Calanoides carinatus s.l. was assumed to be very widespread in the upwelling systems of the Atlantic, Indian and western Pacific Oceans. Molecular data, reported here, show that Calanoides from the eastern Atlantic and Arabian Sea are one species and distinct from C. carinatus s.s. The name Calanoides natalis Brady, 1914 is available for this species, which is fully re-described. The illustration by Brady of the male fifth leg and the currently reported genetic data lead us to conclude that C. natalis is distributed from the Bay of Biscay southwards along the eastern Atlantic, around the Cape of Good Hope, and northwards along the western boundary of the Indian Ocean as far as the Arabian Sea. A by-product of this study is the recognition that Calanoides macrocarinatus is a junior synonym of Calanoides brevicornis. Females of C. natalis are easy to distinguish morphologically from C. carinatus s.s. but are more similar to C. brevicornis, apart from size differences. From physical oceanographic evidence we conclude that the Indian Ocean is currently the upstream part of the distribution of C. natalis. Calanoides philippinensis is known to extend into the eastern Indian Ocean at tropical latitudes. It is not known if it is C. philippinensis that has been recorded along the western coast of Australia. An apparently undescribed species of Calanoides occurs on the eastern Australian coast.     

A new genus of Atlantic octocorals (Octocorallia: Gorgoniidae): systematics of gorgoniids with asymmetric sclerites

Gorgonian corals from the families Gorgoniidae and Plexauridae are among the most abundant and diverse shallow‐water cnidarians found along tropical and temperate Atlantic coasts and reefs. Some morphological traits in the Gorgoniidae comprise a taxonomic challenge due to their morphological plasticity as well as a lack of discrete character states among most genera. Some gorgoniids have asymmetrical sclerites in the surface coenenchyme, a character trait that consists of a continuum among several genera and can cause confusion with members of the family Plexauridae. The collection of a unique gorgoniid in Tobago (Trinidad and Tobago), which contains this trait but also maintains affinities to many different genera, stimulated a wider morphological comparison of gorgoniids using scanning electron microscopy (SEM). Using the morphology of asymmetrical sclerites, gorgoniids could be grouped in four monophyletic clades that were compatible with recent molecular phylogenies and provide a provisional subfamilial classification: (1) a derived clade including gorgoniids with scaphoid sclerites, comprising the reef fauna from the western Atlantic (e.g. Gorgonia, Pseudopterogorgia [ = Antillogorgia], Pterogorgia, and Phyllogorgia); (2) a related group with taxa containing capstan sclerites including genera with short capstans and/or disk‐spindles sclerites such as Pacifogorgia and Leptogorgia ( = Lophogorgia); (3) a clade of gorgoniids with asymmetrical spiny sclerites including the Atlantic genus Muriceopsis and the Indopacific Pinnigorgia together with the distant single species from the new genus and species Tobagogorgia hardyi (it is worth noting that Muriceopsis was previously classified in the Plexauridae, but there is overwhelming molecular support that groups it with the Gorgoniidae and morphological evidence that suggests affinity with Pinnigorgia); and finally (4) a basal clade with long and spiny spindles, which includes some African species such as Filigorgia angolana and F. schoutedeni as well as other new combinations (all species previously classified as Leptogorgia but not phylogenetically related). The combined set of sclerites of Tobagogorgia (e.g. both asymmetrical and irregularly bent spindles) separates it from the diagnostic characters of related genera such as Muriceopsis and Pinnigorgia. The latter two genera are also profusely branched, including pinnate patterns, whereas T. hardyi has only one or two branches. Externally, T. hardyi looks like some Leptogorgia colonies that branch minimally but it is clear that the sclerites are very different and thus also their phylogenetic divergence.     

Life cycle and geographic distribution of the gymnophallid Bartolius pierrei (Digenea) on the Patagonian coast,Argentina

The life cycle of the gymnophallid Bartolius pierrei Cremonte, 2001 Cremonte, F. 2001. Bartolius pierrei n. g. n. sp. (Digenea: Gymnophallidae) from Península Valdés, Argentina. Systematic Parasitology, 49: 139–147. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] (Digenea) at Fracasso Beach (the type locality) (42°25′S, 64°07′W), Península Valdés, Argentina, was elucidated. This digenean uses the clam Darina solenoides (Mactridae) as both first and second intermediate host. The Kelp Gull, Larus dominicanus, and the Red Knot, Calidris canutus rufa, a Neotropical migratory bird, act as definitive hosts. A prevalence of infection of 92% was found in the Red Knot. The cercariae of B. pierrei did not parasitize other invertebrates, not even the tellinid clam Tellina petitiana, which shares the intertidal habitat with D. solenoides. This fact could be explained by the behaviour of the cercaria and its strategy for penetration. The cercariae enter directly in the extrapallial space of the clam by piercing the exposed mantle border. Tellina petitiana could not be invaded by B. pierrei cercariae because it does not expose the mantle border when feeding. Because the Red Knot does not feed on T. petitiana, this behaviour may constitute an adaptive strategy of the parasite. Under laboratory conditions, cercariae lived up to 2 days, metacercariae became infective in 50 days, and the adult life is considerd to be shorter than 3 days. The short adult life span in gymnophallids could be a result of adaptation to migratory birds. This fact would ensure parasite dispersion (i.e. by covering long distances in a short time) and inter-breeding with other Darina-infesting populations located far apart. Bartolius pierrei is an endemic parasite of the Magellan Region, distributed where its intermediate clam host is present, from San José Gulf in Península Valdés to the southern tip of South America.