液控缓闭蝶阀流阻特性试验研究

在液控缓闭蝶阀尚无完整统一试验标准了可循情况下，依靠产研院校的技术和设备，对大口蝶阀流阻特性进行现场测试，依据结果并结合水泵机组失电过渡机理分析，证明所设计和生产的液缓代按预调角度和速度实现快慢两阶段关闭，能有效地控制水锤升压，防止水泵事故倒转，能满足大流量，高扬程，长管道、阶梯式灌溉工程所需。     

天目山北坡蝶类资源和区系

于2002年8月对万家乡天目山北坡的蝶类资源进行了调查研究,经鉴定的蝶类12科91属148种蝴蝶,其中3种是安徽省新纪录种,分别是锦瑟蛱蝶Seokia pratti(Leech)、蓝丸灰蝶Pithecops fulgens Doherty、小黄斑弄蝶Ampittia nana(Leech).并对天目山北坡蝴蝶区系结构进行了分析,得出区系成分中东洋与古北种混杂,东洋种占较大优势,这与天目山位于我国东部古北界和东洋界过渡区的中心的地理位置相一致.     

提高FFT运算速度的几项措施

根据DEF运算的线性特性、数字计算机的结构、汇编语言的特点,提出了几项能进一步提高FFT运算速度的措施,可以以定点运算的速度达到了浮点运算的精度.该几项措施已经运用在ZZ-1旋转机械故障分析仪的功率谱运算之中.实践证明,提高FFT运算速度的效果是十分明显的.     

Microstructure and structural color in wing scales of butterfly Thaumantis diores

The butterfly Thaumantis diores is a species in the Northeast of China. There are two kinds of scales on its wings, which overlap like roof tiles and completely cover the membrane. The SEM results showed that only Type-I scales play a key role in forming the blue structural color. Type-II scales have black chemical color. The cross section micro-configuration of scales is achieved by using the transmission electron microscopy (TEM). The brilliant blue generated through the multilayer microstructure is explained by the photonic crystal reason. The multilayer microstructure of the ridges is optimized to 1D Bragg stack for simulation. The reflectivity of the wing is measured by a spectrometer, and the experimental graph accord with the simulation curves basically. When this species fly, the wing’s color and brightness can change because of the transform between structural color and chemical color. The bionic color-changing design and the significance of this effect in video stealth or other fields are discussed at the end of the paper. Supported by Fok Ying Tong Education Foundation (Grant No. 101020), the Natural Science Foundation of China (Grant No. 30570235, 50635030), National Basic Research of China (Grant No. 2007CB616913) and Key Project of the Ministry of Education (Grant No. 105059)     

蝴蝶拱桥扁平钢箱弯梁的约束扭转分析

以我国首座已建成通车的蝴蝶拱桥为背景,基于乌曼斯基约束扭转的弹性薄壁梁理论及薄壁箱梁的剪力流理论,采用考虑翘曲位移自由度的空间杆系有限元分析模型,结合静载试验实测数据,对该桥单箱多室截面的扁平钢箱弯梁进行了考虑约束扭转效应的空间受力分析.计算结果表明,在蝴蝶拱桥结构中,扁平钢箱弯梁的约束扭转效应比较显著,在设计中应加以考虑.     

New moon from an old hand

The outcome of the Apollo lunar exploration program 1969-1974 was a model of lunar petrogenesis which ignored the probability of selective volatilisation of gases and alkalis from fire-fountaining lunar basalts. It overlooked the fact that the average compositions of the erupted basalts were those of plagioclase-saturated and low-pressure cotectic liquids on eruption, clearly indicating that they were not primary magmas. The basalts may have undergone evolution by gabbro fractionation within the lunar crust, perhaps in large lava lakes now solidified as the lunar maria. The existing model involving a global magma ocean and plagioclase flotation to form the lunar crust arises solely from the incorrect assumption that the basalts are primary magmas. The plagioclase flotation hypothesis requires the presence of a significant positive europium anomaly in the lunar highland crust, and was founded upon its alleged presence. However, that positive anomaly is neither established by the original data set nor by the much broader current data set. Critical observations, and experiments which will advance the debate are suggested, and alternative interpretations outlined.     

Photonic structures in butterfly<Emphasis Type="Italic">Thaumantis diores</Emphasis>

The beauty created by Nature always inspires people to fabricate artificial structures with certain functions in a bionic way.There has been a greal interest in photonic band gap (PBG) materials since the concept was first proposed by Yablonovich and John in 1987.However,Nature had already created these PBG structures in living organisms long since.     

鸡公山国家自然保护区蝶类资源与区系研究

2005—2008年对鸡公山自然保护区蝶类资源进行了调查,共鉴定有112种,隶属9科68属.其中凤蝶科4属14种,蛱蝶科22属32种,粉蝶科8属17种,眼蝶科7属16种,灰蝶科11属14种,弄蝶科13属16种,喙蝶科、珍蝶科、绢蝶科均为1属1种.发现本地区新纪录种20种,河南省新记录种6种.蝶类属种平均比值为0.61,单属数占总属数的69.1%,古北种类与东洋种类的比值为0.33(16/48).蝶类区系结构表明:鸡公山自然保护区蝴蝶种群以东洋种为主,具有东洋界属性向古北界过渡的特征.     

井冈山地区蝶类资源新记录

在《井冈山蝶类志》的基础上,笔者于2009~2012年开展了对井冈山地区蝶类资源的连续性野外调查研究。期间通过拍摄蝶类生态照片,采集成虫标本,或者采集卵和幼虫进行人工饲养等方式,获取大量蝶类资源样本,系统整理后进行物种的分类鉴定。结果显示,井冈山地区已知蝶类达到275种,隶属11科145属(亚属);其中,新记录的蝶类物种有44种,隶属9科37属。结果还表明,环境保护越好的区域,蝶类资源也越丰富。     

湖北桃花冲国家森林公园蝶类资源及区系研究

2007年6月对湖北省英山县桃花冲国家森林公园进行了为期12 d的蝶类资源调查,共采集到蝶类标本348只,经鉴定桃花冲森林公园有蝶类59种,隶属于8科38属,其中有5种为湖北地区新记录.根据调查结果对蝶类区系组成进行了分析,表明该地区的蝶类以东洋界种为主,古北种和广布种也有较多分布.