黄钩蛱蝶触角感器的扫描电镜观察

应用扫描电镜对黄钩蛱蝶（Polygoniac—aureum）成虫触角感器的超微结构、类型和分布进行了研究．结果表明,黄钩蛱蝶触角上存在着7种感器,即星形感器、毛形感器、刺形感器、腔形感器、腔锥形感器、芽孢形感器和鳞形感器．其中以星形感器数目最多．     

美洲大蠊触角感受器初步观察

初步在扫描电子显微镜下观察了美洲大蠊触角表面的感受器形态。对有孔锥形感器、毛形感器和刺形感器Ｂ作了较详细描述。同时对美洲大蠊触角表面鳞片状构造进行了高倍观察。     

匀鞭蚜小蜂(Encarsia sp.)扫描电镜观察——Ⅱ.触角的构造及其感器

用扫描电镜观察了匀鞭蚜小蜂的触角及其感器,计有毛状、坛状、指状感器,纵形及钟形感器。并对各种感器的分布及排列作了描述。     

松毛虫赤眼蜂雌性触角五种感器的超微结构(膜翅目:赤眼蜂科)

利用透射电镜研究了松毛虫赤眼蜂(Trichogramma dendrolimi)雌性触角5种感器。观察到毛形感器远端神经树状突膨大成为外节,外节的端部有细管体,说明它是属于机械感器,具有触觉的功能。刺形感器和坛形感器是化学感器,前者的角质壁上见有嗅孔分布,后者角质壁出现11～13条纵列狭窄的凹沟,每条凹沟都通向内部的大室。i型感器有两种形态:i型I占绝大多数,在其角质壁上无嗅孔,感觉神经树状突分布在感器的内腔中,可能是一种具有触觉作用的机械感器;极少数为i型Ⅱ,在毛的内腔出现大室和小室,感觉神经树状突只伸向内腔的小室,根据有大、小室的存在,它们具有味觉作用,但从它的基部收缢的特点,说明又有触觉的功能,所以是具有双重性质的感器。至于栓锥感器,树状突出现在内腔,但从结构上没有嗅孔这一特征分析,可以归属为机械感器。     

匀鞭蚜小蜂(Encarsia sp.)扫描电镜观察 Ⅰ.成虫足的形态及感器

匀鞭蚜小蜂3对足的特点是:3对足的基节均具有相同数量的指状感器,转节上具有同样的盘状感器。前足胫节及基跗节发达,并有触角清洁器。后足腿节粗壮,便于跳跃。     

贵州茂兰蛱蝶资源及区系分析

2007年4月～2009年7月,对贵州茂兰国家级自然保护区的蛱蝶进行采集,经鉴定共计28属46种;结合相关文献记录,茂兰保护区的蛱蝶共计38属98种,其中老豹蛱蝶属(Argyronome)为茂兰新纪录属,螯蛱蝶(Charaxes marmax)、老豹蛱蝶(Argyronome laodice)、珂环蛱蝶(Neptis clinia)、娜环蛱蝶(N.nata)、断环蛱蝶(N.sankara)、中华卡环蛱蝶(N.sinocartica)、阿环蛱蝶(N.ananta)、桂北环蛱蝶(N.guia)、秦菲蛱蝶(Phaedyma chinga)、小红蛱蝶(Vanessa cardui)和黄豹盛蛱蝶(Symbrenthia brabira)共11种为茂兰新记录物种,银白蛱蝶、傲白蛱蝶、黑紫蛱蝶和枯叶蛱蝶共4种为中国珍稀蝶类.环蛱蝶属种类最多,为优势属.中国珍稀蝶类中,枯叶蛱蝶种群数量较大,为优势种.在世界动物地理区划中,茂兰保护区蛱蝶古北-东洋共有种和东洋种相互混杂,古北-东洋共有种占优势;在中国地理区划中具有21个分布型,区系分布比较零散,但比较集中于华中区、华南区和西南区.与国内其它自然保护区相比,茂兰保护区的蛱蝶资源非常丰富,应该作为种质资源加以保护,并可适度开发和综合利用.     

n星形联接无耦合电感网络与网形电感网络的等效变换

文中提出动态网络分析中包含n星形联接的电感网络,可用等效变换法将其用网形电感网络来代换,并给出等效变换的方法,进而消去了电路中的星形电感割集.     

电阻星形联接与三角形联接的等效变换

电阻三角形(△形)联接如下图所示:第二种画法呈π形状,所以△形联接有时也称π形联接.电阻星形联接(Y形)如下图所示:     

安徽省蝶类新纪录(2016—2019年)

安徽省蝶类资源丰富,现已有记录6科150属304种。本研究于2016—2019年对安徽省蝴蝶种类展开调查,通过监测发现蝶类新纪录8种,隶属于3科7属,分别为黑紫蛱蝶Sasakia funebris、宽带黛眼蝶Lethe helena、迁粉蝶Catopsilia pomona、钩翅眼蛱蝶Junonia iphita、拟鹰翠蛱蝶Euthalia yao、幻紫斑蛱蝶Hypolimnas bolina、六点带蛱蝶Athyma punctata和东方带蛱蝶Athyma orientalis。本文对新纪录种进行记录,补充安徽省蝶类资源,为进一步制定蝴蝶保护方针提供支撑,为安徽省蝴蝶产业发展奠定基础。     

安徽省蝶类新纪录

2009年8月对安徽黄山风景区的蝶类资源进行了调查,经鉴定其中5种为安徽省新纪录种,分别是湘南荫眼蝶、黄重环蛱蝶、渡带翠蛱蝶、珠履带蛱蝶和曲纹袖弄蝶。     

Performance of passive and reactive profiled median barriers in traffic noise reduction

Median noise barriers, like parallel noise barriers, can be employed to reduce the impact of traffic on roadside communities via the direct propagation path. The performance of different shapes of median barriers was compared using reactive and passive surfaces and a 2D boundary element method (BEM). In the case of reactive surfaces, quadratic residue diffusers (QRDs) and primitive root diffusers (PRDs) were used on the top and stem surfaces of median barriers. To introduce passive barriers, two different absorbent materials including fibrous material and a grass surface with flow resistivity of 20 000 and 2500 kg/(s·m²), respectively, were similarly applied. The effect of thin absorptive barriers was similar at lower frequencies and better at mid and high frequencies to that of their equivalent rigid barriers. More improvement was achieved by covering the top surface of thick barriers with grass rather than with fibrous material. The performance of QRD and PRD barriers where the diffuser was located on the top surface was more frequency dependent than that of barriers coated with fibrous material. A comparison of the average A-weighted insertion loss in the thick barriers showed that the greatest improvement (2.59 dB (A)) was achieved using a barrier of 30-cm thickness covered with grass.     

滨海软土浅埋大断面矩形顶管施工力学分析

分析了滨海软土地层下浅埋大断面矩形顶管施工力学特性,结合顶管工程现场沉降监测数据的整理与有限元模拟结果的验证对比,系统研究了滨海软土层浅埋大断面矩形顶管顶进过程的地表沉降变形以及顶管应力的变化规律。 结果表明,地表隆起受顶推力的影响,地表沉降由地层损失产生?随顶管的顶进,顶管的应力变化速率逐渐降低最终趋于平稳,顶管的侧面最大正应力比顶部应力稍大,顶管底部的最大正应力相对顶部和侧面都有较大的提升。     

Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys

AlSi12 samples were prepared by selective laser melting (SLM) under different processing conditions in order to obtain different top surface morphologies, where single tracks were produced using a fixed processing parameter to reveal the mechanism of the single track on different morphologies. The results show that the morphologies of single tracks changed with roughness of the top surface (Top R_a) of SLM parts, reflected in the variation of wetting angles on the surface processed previously as well as in dimensions of height, width, and depth at the cross-section of each single track. These changes were mainly caused by different wettability and flow behavior of the molten metal under various solidification environments of the single track during SLM. A poor solidification environment in which numerous balls existed limited an effective wetting behavior of molten metal on a previously processed surface of a SLM sample because of an increasing solid-liquid contact area, thus causing dramatical instability of the melt pool and attendant inferior processability of the single track. Meanwhile, under the action of surface tension, the molten metal had a high tendency to transfer into a pore near the single track to form an extending track or flow toward an upper region of melt to form a balling track, hence showing various morphologies of single tracks. This study proposes a theory of the solidification mechanism of single track on the non-ideal surface to provide a better understanding of the SLM processing of Al-Si alloy.     

盾构施工参数对地层变形的影响

以南宁地铁一号线南湖段下穿隧道为工程背景,建立隧道开挖的三维有限元模型,通过数值分析,得到盾构施工过程中地层变形的分布规律,讨论盾构施工过程中注浆压力对地表沉降、水平位移及拱顶位移的影响,分析掌子面压力对地表隆起的影响规律。研究结果表明,注浆压力对地表变形会产生明显的影响,随着注浆压力的增大,地表沉降及水平位移明显减小。当掌子面压力大于0.1 MPa时,会引起掌子面前方土体产生向上的位移,地表隆起量随掌子面压力的增加而增大。     

SURFACE MORPHOLOGIES OF ALUMINUM FILMS ON SILICONE OIL SURFACES

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｎａｔｕｒｅｏｆｓｕｂｓｔｒａｔｅｓｈａｓａｃｒｕｃｉａｌｅｆｆｅｃｔｏｎｂｏｔｈｔｈｅｍｉｃｒｏｓｔｒｕｃｔｕｒｅｏｆｔｈｅｆｉｌｍｓａｎｄｔｈｅｇｒｏｗｔｈｍｅｃｈａｎｉｓｍ (Ｈａｕｓｅｔａｌ.,1 987;Ｋｒｕｇｅｔａｌ.,1 990 ) .Ｆｏｒｉｎｓｔａｎｃｅ,ｔｈｅｔｏｐｓｕｒｆａｃｅｓｏｆｍｅｔａｌｌｉｃｔｈｉｎｆｉｌｍｓｄｅｐｏｓｉｔｅｄｏｎｓｏｌｉｄｓｕｂｓｔｒａｔｅｓｇｅｎｅｒａｌｌｙｈａｖｅａｒｏｕｇｈｓｔｒｕｃｔｕｒｅ ,ｗｈｉｃｈｃａｎｂｅｄｅｓｃｒｉｂｅｄｂ…     

Self-organizing evolution of anodized oxide films on Ti-25Nb-3Mo-2Sn-3Zr alloy and hydrophilicity

In the present work,hierarchical nanostructured titanium dioxide（TiO2） films were fabricated on Ti-25Nb-3Mo-2Sn-3Zr（TLM） alloy for biomedical applications via one-step anodization process in ethylene glycolbased electrolyte containing 0.5wt% NH4F.The nanostructured TiO2 films exhibited three distinct types depending on the anodization time：top irregular nanopores（INP）/beneath regular nanopores（RNP）,top INP/middle regular nanotubes（RNT）/bottom RNP and top RNT with underlying RNP.The evolution of the nanostructured TiO2 films with anodization time demonstrated that self-organizing nanopores formed at the very beginning and individual nanotubes originated from underlying nanopore dissolution.Furthermore,a modified two-stage self-organizing mechanism was introduced to illustrate the growth of the nanostructured TiO2 films.Compared with TLM titanium alloy matrix,the TiO2 films with special nano-structure hold better hydrophilicity and higher specific surface area,which lays the foundation for their biomedical applications.     

一种第一类永动机的设计错误分析

分析了一种根据毛细现象原理设计的永动机的错误原因。指出,由于毛细管顶部表面层接触角大于零导致表面层面积减小、表面层张力减小,致使毛细管内液体实际上升高度减小,故而此第一类永动机的设计是不可能实现的。     

曲面造型的方法与实现

对非均匀有理B样条(NURBS)参数化特征设计和隐式代数曲面的原理实现曲面造型进行了介绍。在仿真的过程中运用CAD/CAM技术软件实现了凉亭顶部的设计,证实了在软件中运用非均匀有理B样条(NURBS)参数化特征设计在曲面造型方面是可行的,不仅拟合度好而且可以提高设计效率,并且可以使得图形更严密。     

好望角

晴空万里,站在平坦的桌山之顶是众多美妙时刻之一,如此美丽的画面烙在了记忆最深处,永远都不会忘记。身边不时有岩兔蹿过,清新微凉的海风抚过脸颊,想想自己正站在高过大西洋（无限蔓延的一片铁蓝）1086米的地方,顿生“会当临绝顶”的感慨。由于这座山山形奇特,因此也被赋予了一种深刻的精神意义——隐约的石英岩和花岗石悬崖以一种保卫的姿态守护这座城市近三个半世纪。