高超声速飞行器上可调天线的设计与实现

当飞行器处于高超声速飞行状态时,其外部会形成等离子体鞘套。等离子体的存在会使飞行器上的天线发生阻抗失配,导致谐振频率偏移以及回波损耗的增加。通过不同速度、高度等条件下等离子体密度的数值预测,进一步估算对天线谐振频率偏移等性能的影响。考虑到元器件的电抗在L波段的寄生效应,利用广义连接网络的方法,对匹配网络设计和优化,完成等离子体环境下的天线阻抗调谐。实验表明,通过改变匹配网络中变容管的容值,等离子体环境下天线的输入阻抗可以被调节,从而复原谐振频率、降低回波损耗、恢复通信性能。     

胡蜂蜂毒肽Mastoparan的研究概况

胡蜂毒液中存在多种活性物质,经蛰刺后进入动物机体,往往造成剧痛、水肿、局部损伤等一系列生理病理反应。阳离子十四肽m astoparan(MP)是胡蜂毒液中极为重要的一个组份,它具有诱导肥大细胞脱颗粒释放组胺,激活G蛋白、磷脂酶C(PLC)、磷脂酶D(PLD)、磷脂酸酶A2(PLA2),改变胞内外Ca2 浓度等多种活性,可以应用于科学研究、抗原检测、临床治疗等多个领域。与MP家族其它成员在序列和构象上进行比较分析后,通过对其结构进行修饰加工,可以产生新的、特异性好的MP类似物。     

云南省柑桔蚧虫的寄生蜂初报

报道从云南省柑桔蚧虫育出的寄生蜂３４种，隶属２个总科、６个科、２４个属；其中９种为云南省新记录，指出了常见蚧虫的主要寄生蜂，对３个我国未报道而在云南常见的种作了简要记述并附特征图。     

导引头隔离度寄生回路稳定性及测试方法

为研究导引头隔离度寄生回路稳定性,基于典型平台导引头建立了隔离度传递函数和隔离度寄生回路模型,提出了2种基于半实物仿真试验的寄生回路稳定性测试评价方法. 利用频域法解析分析了隔离度传递函数的特性,利用劳斯判据研究了制导参数与寄生回路稳定域的影响. 结合某红外图像导引头,在典型飞行条件下数值分析了隔离度传递函数特性和隔离度寄生回路稳定性能,并利用实验验证了隔离度寄生回路稳定性测试方法的有效性. 研究表明寄生回路稳定性最严重的区域位于中频段,制导参数和隔离度传递函数的幅相特性均对寄生回路的稳定性有重要影响.      

寄生于大鳍鳠的杜父鱼驼形线虫的生态研究

杜父鱼驼形线虫的总感染率为10.8%.年平均感染强度为1.5(1～3),相对密度为0.2.该线虫在宿主种群中为聚集分布.水温在16℃左右时.感染率、平均感染强度和相对密度最高,分别为40%,3和0.6;宿主年龄对该线虫的种群数量有明显影响.该线虫种群有明显的季节变化,它使被感染的低龄(1～3)鱼的肥满度平均下降6.3%.     

禾谷丝核菌生物学的研究——Ⅲ.寄主范围

作者以大麦和小麦粒为禾谷丝核菌的培养基质,繁殖菌种,接入经用福尔马林消毒的土壤,分别播种经用0.1％升汞水消毒的30种植物的种子或幼芽,测定出19种植物为该菌的寄主。并记载了各种寄主植物的发病症状和出现症状的生育期。     

花生黄曲霉与其他寄生真菌的种群及动态分析

对鲁花14,花育16,白沙,花37等四个花生品种不同生育时期籽仁、果壳、根部、果针等部位寄生真菌的种类进行了初步鉴定。共鉴定出8个真菌类型,其中黄曲霉菌(AspergillusflavusLink)、镰刀菌(Fusariumspp.)、桑卷担菌(Helicobasidiummompa)、青霉菌(Penicilliumspp.)、黑曲霉菌(Aspergillusniger)等为主要真菌。表现在不同品种各部位间分布广、带菌量高,持续时间长。其中,青霉菌在籽仁中的带菌率最高,镰刀菌在果针中的带菌率最高,桑卷担菌在根和果壳中的带菌率最高。不同品种的花生黄曲霉感染率有所差异。鲁花14的黄曲霉带菌率最低,花育16、白沙、花37的带菌率较高。     

重庆地区黑眶蟾蜍Bufo melanostictus肠道3种寄生鞭毛虫的研究

采用活体观察及Giemsa染色方法,对重庆北碚地区黑眶蟾蜍（Bufo melanostictus）肠道内的3种寄生鞭毛虫,即：肠六鞭毛虫（Hexamita intestinalis,Dujardin,1841）,巨大唇鞭虫（Chilomastix giganta,Nie,1948）和堂皇三毛滴虫（Tritrichomonas augusta,Alexeieff,1911）进行了形态学研究,其中巨大唇鞭虫（C.giganta）为中国新记录种。文章对所获3种鞭毛虫还进行了种的清理和修定。     

Four species of Caligus Müller, 1785 (Copepoda,Siphonostomatoida, Caligidae) parasitic on marine fishes of Taiwan

Four species of Caligus, with two new species, are reported from five species of marine fishes of Taiwan. They are: Caligus arii Bassett‐Smith, 1898 Bassett‐Smith, P. W. 1898. Further new parasitic copepods found on fish in the Indo‐tropical region.. Annals and Magazine of Natural History (Series 7), 2: 77–98. [Taylor & Francis Online] , [Google Scholar] on the body surface of Trichiurus lepturus Linnaeus, Caligus dasyaticus Rangnekar, 1957 Rangnekar, M. P. 1957. Caligus dasyaticus sp. nov. and Caligus dussumieri sp. nov., (Copepoda) parasitic on Bombay fishes.. Journal of the University of Bombay, 25: 16–22.  [Google Scholar] on the body surface of Dasyatis navarrae (Steindachner), Caligus dactylus n. sp. on the gill filaments of Dactyloptera peterseni (Nyström), and Caligus lutjani n. sp. in the oral/gill cavities of Lutjanus argentimaculaltus (Forsskål) and Lutjanus bohar (Forsskål). Both C. arii and C. dasyaticus are reported for the first time from Taiwan. Caligus dactylus differs from its congeners by the possession of the following combination of features: large myxal process on the maxilliped; a pair of parallel tines on the sternal furca with truncate tip; simple elements (without accessory process) at the tip of leg 1 exopod; and an armature formula of I‐0; I,III on leg 4. Caligus lutjani is distinguished by carrying a two‐segmented abdomen; a pair of diverged tines on the sternal furca with acute tip; an accessory process on the middle two of the terminal four elements on the exopod of leg 1; and a bipectinate, spiniform process on the exopod of leg 4 at the insertion of each of the five outer spines.     

The life cycle of Diploproctodaeum arothroni Bray and Nahhas, 1998 (Digenea: Lepocreadiidae), with a comment on the parasitic castration of its molluscan intermediate host

Diploproctodaeum arothroni Bray and Nahhas, 1998 Bray, R. A. and Nahhas, F. M. 1998. Diploproctodaeum arothroni n. sp. (Digenea: Lepocreadiidae) from the pufferfish Arthron hispidus (Tetraodontidae) from Suva, Fiji, with a revised key to the species of the genus.. Systematic Parasitology, 40: 55–59. [Crossref] , [Google Scholar] (Digenea: Lepocreadiidae) was found in the intestine of its type‐host, Arothron hispidus, a tetraodontid fish permanently resident in a lagoon within the mangrove swamps on the Egyptian coast of the Gulf of Aqaba. Larval forms of this trematode (sporocysts, rediae, and cercariae) were found in the gonads and digestive gland of Crassostrea cuccullata (Ostreidae), a common oyster in the same lagoon. So, the life cycle of D. arothroni is elucidated under natural conditions; eggs are directly ingested by the oyster; mother sporocysts and rediae reach their maturity 3–5 and 9–11 weeks after infection; rediae contain 18–25 developing cercariae; fully mature cercariae are trichocercous, without penetration glands, emerge from the oyster during the night 14–15 weeks after infection, their existence in seawater being very brief and transitory, and rapidly encyst on aquatic vegetation or other surfaces (there is no second intermediate host); encysted metacercaria are not progenetic; 4‐day‐old metacercariae encysted on filamentous algae fed to A. hispidus developed into fully mature worms 8–9 weeks after infection. This cycle is completed in about 24 weeks and has its own characteristics, which differentiate it from the other known lepocreadiid life cycles. All of the developmental stages are figured and described. Parasitic castration in the females of C. cuccullata caused by the parasite was studied histologically and is described and discussed.