福建省家禽嗜眼吸虫的研究

嗜眼属(Philophthalmus Looss,1899)吸虫主要寄生在鸟类的结膜囊(conjunctival sac)瞬膜(nictitating membrane)中,由于虫体机械刺激及分泌物毒素的影响,患禽眼黏膜充血、组织液渗出、角膜与瞬膜晦暗充血,有的化脓溃疡,眼睑肿大或紧闭。鸟类尤其幼雏因此眼疾而不能寻食、消瘦,有的两腿瘫痪,严重的致死。除鸟类外,兔子、小白鼠及小型哺乳动物亦可受感染(Alicata and Ching,1960;Cheng and Thakur,1967)。在南斯拉夫

献血者中戊型肝炎病毒血症研究

目的　了解湖州地区献血者戊型肝炎病毒感染情况。方法　采用ELISA法检测 30 4 7名无偿献血者血清抗 HEVIgM和IgG抗体 ,巢式RT PCR检测抗 HEVIgM阳性血清中HEVRNA。 结果　 30 4 7名无偿献血者中抗 HEVIgG的检出率为 4 1.7% ,抗 HEVIgM检出率为 1.5 %。 4 6份抗 HEVIgM阳性中发现 6份HEVRNA阳性。献血者中病毒血症阳性率为 0 .2 %。 6名HEV病毒血症者中 4名为HEV基因Ⅰ型 ,另 2例为HEV基因Ⅳ型。结论　在献血者中HEV病毒血症并不罕见 ,有必要对输血后戊肝的潜在危险进行评估

法学家眼中的和谐社会

从现有权威性文献看,“和谐社会”是执政党要追求的一种社会状态,更是一种涉及面极其广泛的治国方略。在这个过程中,法律、法学和法学家的作用举足重轻。面对如此重大议题,法学家应当表达观点、提出诉求、发挥专业功能。基于这种考虑,本刊特邀部分中青年法学家进行了笔谈,希望他们的文章能引起讨论,促进法律界、法学界形成一些基本共识

STUDY ON THE MORPHOLOGY AND ULTRASTRUCTURE of THE INNER EAR of OREOCHROMIS SP.

罗非鱼内耳器官结构与典型硬骨鱼的内耳结构一致。球状囊呈椭圆体状，其耳五充满整个囊体，耳石上有明显的中央沟，中央沟在形态上与球状囊听斑一致；听囊呈圆形，听囊耳五约占整个听囊一半，耳石较薄且较透明，有明显外缘区和中央区之分；椭圆囊呈不规则椭球体状，其耳石占椭圆囊的较小部分，耳石表面粗糙。罗非鱼耳石膜为一层胶质膜，位于耳石和听斑之间，并触及所有毛细胞，膜有大量小孔，小孔处恰为毛细胞的纤毛束伸入，纤毛束透过小孔触及到耳石。扫描电镜观察表明，罗非鱼内耳听斑也由毛细胞和支持细胞组成，听斑表面有大量具一定分布规律的纤毛束。罗非鱼内耳听觉器官主要有三种纤毛束类型：f＿1、f＿2和f＿3型。按照纤毛束的取向一致性，球状囊听斑划分三个区；听囊听斑和椭圆囊听斑均划分两个区。This paper deals with the morphological structure of the inner ear of anonostariophysine Fish, Oreochromis sp,From the lake of Xiamen University,using light andscanning electron microscopy.The results are as Follows;1.The structure of the ear in Oreochromis sp.is the same as that of“the typical teleostear”.which consists of three semicircular canals(anterior,posterior and horizontalsemicircular canals)and three otolithic organs(utriculs,lagena and sacculus).Each Fish hastwo ears between which no connection was obesrved.The bilateral mirror symmbtry of eachsaccular pair often involves divergence of the anterior ends 25-30°away From thebody-midline.2.The sacculus is particularly large and utricular-shaped, with a single large otolith Fil-ling the whole otolithic sac,The saccular otolith is a laterally Flattened elipsoid with a deepmedial sulcus with which the sensory epithelium is closely connected.The lagena is generallysmall and round in shape with a small and thin triangular otolith Filling only halF of thesacculus.The utriculus is irregular in shape.The utricular otolith is also small and has roughsurFace,Filling only a small part of the sacculus;3.The otolithic membrane is a thin gelatinous structure lying between the macula andthe otolith,contacting all the sensory cellshcluding those in regions not directly“undcF”theotolith.The membrane has a large number of small holes where the ciliary bunddles extendand contact the otolith.4.The results of scanning electron microscopy reveal that the maculae consist of sensoryeells and supporting cells and the surFace of the sensory epithelia of each of the otolithic or-gans is distributed with a lot of ciliary bundles in a certain pattern.There are mainly threetypes of three ciliary bundle F_1, F_2 and F_3.in the inner ear organs of the Oreochromissp.Each otolithic macula can be divided into a number of regions within which all the ciliarybundles are morphologically polarized in the same two in lagenar macula and two in utricularmacula,Morphologically,the utricular macula is dish-shaped and has a lateral extension,the lagenar macula is the shape of a Fat crescent and the saccular macula is elongate but widerat the rostral than the caudal end, like the shape of a tadpole.国家自然科学基

面向可靠性设计的发动机材料超高周疲劳强度估计方法

提出了一种面向可靠性设计的四参数随机疲劳极限模型，可针对小样本数据实现超高周疲劳（VHCF）应力-寿命（S-N）曲线处理。通过对航空用钛合金常规样本数超高周疲劳数据的拟合分析和对比验证了模型的准确性。同时，以某型航空发动机压气机叶片用TC17钛合金为研究对象，分别对室温（RT）和400℃小样本超高周疲劳数据进行了处理，得到了典型置信度和可靠度条件下的超高周疲劳强度估计值。结果表明：本文提出的四参数随机疲劳极限模型，能够通过少量的长寿命区试验数据获得材料超高周范围内发动机设计所需的疲劳强度估计值；相较于常用的升降法，基于本模型进行试验安排可大幅降低68%的试验量，为发动机材料的超高周疲劳强度评价提供方法支持

Feasible trajectory generation for autonomous vehicles based on quartic Bzier curve

对于实际的无人车系统来说，轨迹规划需要保证其规划出来的轨迹满足运动学约束、侧滑约束以及执行机构约束。为了生成满足无人车初始状态约束、目标状态约束的局部可行轨迹,本文提出了一种基于四阶贝塞尔曲线的轨迹规划方法。在该方法中,轨迹规划问题首先被分解为轨形规划及速度规划两个子问题。为了满足运动学约束、初始状态约束、目标状态约束以及曲率连续约束,本文采用由3个参数确定的四阶贝塞尔曲线来规划轨迹形状。为了保证转向机构可行,本文进一步采用优化方法求解一组最优参数从而规划出曲率变化最小的轨线。对于轨线执行速度规划,为了满足速度连续约束、加速度连续约束、加速度有界约束以及目标状态侧滑约束，本文首先求解了可行的轨迹执行耗时区间,再进一步在该区间中求解能够保证任意轨迹点满足侧滑约束的耗时，最后再由该耗时对任意点速度进行规划。本文结合实际无人车的应用对轨迹搜索空间生成、道路行车模拟以及路径跟踪进行了仿真实验，并基于实际的环境数据进行了轨迹规划实验

Historical Development of Populus euphratica in the Upper Stream of Tarim River and Its Causes

通过遥感、地理信息系统及现场调查的方法;对塔里木河上游段沙雅县1989年和2009年2期卫星影像进行遥感解译;从面积、空间格局、林分质量等角度;分析了沙雅县胡杨林20年的演变情况;查找了演变的原因;并据此提出了胡杨林的保护措施

Electrophysiological observation on sacculus of Tilapia sp

罗非鱼球状囊微音器电位是一个双峰波。峰频与刺激声频成2∶1关系；在20~80Hz电位波形不规则。在300~900Hz电位波呈矩形。实验表明，球状囊不同区域对一定的声频敏感性不一样；延脑-脊髓连结处的诱发电位与球状囊微音器电位相似，但在130Hz电位呈单峰波；罗非鱼可闻频域在20~900Hz，最大敏感声频在130Hz，其相对敏感性为23.01db；延脑-脊髓连接处诱发电位最大值在63Hz和130Hz，相对敏感性分别为25.36和23.37db；罗非鱼气鳔与内耳无直接关系，去鳔对其微音电位听力曲线无明显影响。Using microphonic potentials as a tool,the authors deal with the characters of electrophysiological response of the sacculus of a nonostariophysan Fish,Tilapia sp.,to underwater sound stimuli at low Frequencies.The results are as Follows:1.Microphonic potentials recorded From the sacculus in response to underwater sound stimulation show that the potential is that of the typical microphonic potential of Fish,which has two wave Peaks,and the Frequency of the potential wave and that of the stimulation has a 2:1 relationship.In this study,the shape of potentials at 20--80Hz is irregular and that at 300--900Hz is rectangle-shaped.DiFFerent regions of the sacculus have diFFerent response sensitivities to a certain kind of underwater sound.2.Potentials recorded From the cerebellar-medullary junction show a similar Feature compared with those From the sacculus.but the POtential From the junction at l3OHz is a single peak,For all of this evoked-potentials should be Further studied.3.the result of the microphonic potential curve From the sacculus reveals that Tilapia responds to underwater sound stimulation From 20 to 900 Hz with a maximum sensitive Frenquency at 130Hz and its maximum sensitivity is +23.01 dB (relative).the experiment with cerebellar-medullary junction Found that the maximum potentials were at 63 Hz and 130 Hz with maximum sensitivities separately 25.36 dB and 23.37 dB(relative).4.Elimination of the swimbladder caused on change in sensitivities at any Frequencies,which were in correspondence with the result of anatomy.国家自然科学基金!691101

The Environmental Impact and Protective Strategy to Eco-Tourism around Populus Euphratica——With the development of eco-tourism around Populus Euphratica in the Shaya County,Sinkiang province as an example

随着生态旅游在我国广泛开展,其引发的环境问题越来越引起人们的关注。本文以新疆沙雅胡杨林生态旅游开发为例,分析了各类旅游资源的敏感性及旅游开发对它们的生态影响,并提出了相应的保护对策。最终认为,沙雅胡杨林生态功能远大于其旅游功能,不适合进行高强度地旅游开发,应在区域生态承载力和旅游环境容量的基础上进行,同时旅游规划必须经过严格地环境影响评价。本研究可为其他地区开展胡杨林生态旅游提供参考