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When the researchers compared the human ultraconserved element to all the DNA sequences in the public database GenBank, the closest match was to DNA from the coelacanth -- an ancient fish thought to have gone extinct millions of years ago until a live specimen was caught in 1938 off the east coast of South Africa.

该鱼类一度被认为已经绝种,直到1938年在南非的东海岸又重新被发现。腔棘鱼是一种3亿6千万年海洋生物向陆地脊椎动物进化过程中至关重要的鱼类的后裔。虽然人类和腔棘鱼的演化从那时就分道扬镳,然后经过百万年的演化人类和腔棘鱼仍然共享着类似的重要基因片断。

On the basis of the Leonov viscoelastic constitutive model, oscillatory shear flow of polymer melts in cavity during injection molding (including oscillation shear stress, melt temperature rise generated by oscillation, oscillation pressure gradient, solidified layer and oriented layer) has been researched for the first time.

本文采用了Leonov粘弹本构模型,首次研究了在注射成型中模腔内聚合熔体的振动剪切流动规律(包括振动剪切应力、振动产生的熔体温升、振动压力梯度、固化层和取向层),在研究模腔内振动剪切流动机理的同时,还在实验上研究了振动作用对制品结构和性能的影响。

The results show that the emission probability behaviors in the non-degenerate two-photon mazer differ from those in the degenerate two-photon mazer,since two cavity modes are allowed in the mazer so that there are two freedoms changing the potentials that the atoms experience as they transit the cavity.

发现由于在微脉塞中存在两种腔场模式,导致有两个自由度来改变原子在经过腔场时所受到的势场,因此非简并双光子微脉塞的发射几率的行为不同于简并双光子情况下的发射几率。

The metal mold design now adopt a form of one mole but six cayities ,this way can improve the efficiency;the mold's joint face is the ball's neutral plane,that makes the mold opened convenient;In the gating,the runner and the riser is the same ,and this design adopt scum riser,that make sure a better routing and make sure the casting's feeding;the mold use gravity to lockwasher itself;the core's material is quartz sand,and spread high tempearature resistant dope on it;In the design, same taper in the guide bush of the core box is needed to make sure open the mold easily;The insert blocks of the core box are made by numercial control processing,this way reduce the cost of production; the scale division positioner make sure the same specification has better interchangeability,also,as all the machining can be finished on the general machine tool,it make the cost low,so it can be spreaded abundant in the medium and minor enterprise;when workout the mold's processing technology,this design adopt the rough's two end plane as benchmark,the ball cavities are machined by scale division positioner;then use Autocad,Pro/e to draw planar and three dimension blueprint,use Pro/e to make three-dimensional animation.

本次设计的群铸模具采用一模六腔形式,生产效率高;模具分型面选择磨球的中性面,使得分模方便;浇注系统采用浇冒口一体形式和集渣包设计,保证了良好的加工工艺和补缩;锁模方式为重力锁模;砂芯采用石英砂,并在表层涂以耐高温涂料;芯盒导套选择一定的锥度,使取模容易;芯盒镶块运用数控加工,降低了生产成本;分度胎具保证了同种规格模具具有良好的互换性,而且因为所有加工基本都可以在普通机床上完成,生产成本低,可以为中小型企业普遍采用;在加工工艺编制过程中,采用两端面互为基准,球腔用专业夹具加工;Autocad,Pro/e分别制作了模具的二维和三维立体图,并运用Pro/e制作了三维动画演示。

The metal mold design now adopt a form of one mole but six cayities ,this way can improve the efficiency;the molds joint face is the balls neutral plane,that makes the mold opened convenient;In the gating,the runner and the riser is the same ,and this design adopt scum riser,that make sure a better routing and make sure the castings feeding;the mold use gravity to lockwasher itself;the cores material is quartz sand,and spread high tempearature resistant dope on it;In the design, same taper in the guide bush of the core box is needed to make sure open the mold easily;The insert blocks of the core box are made by numercial control processing,this way reduce the cost of production; the scale division positioner make sure the same specification has better interchangeability,also,as all the machining can be finished on the general machine tool,it make the cost low,so it can be spreaded abundant in the medium and minor enterprise;when workout the molds processing technology,this design adopt the roughs two end plane as benchmark,the ball cavities are machined by scale division positioner;then use Autocad,Pro/e to draw planar and three dimension blueprint,use Pro/e to make three.dimensional animation.

本次设计的群铸模具采用一模六腔形式,生产效率高;模具分型面选择磨球的中性面,使得分模方便;浇注系统采用浇冒口一体形式和集渣包设计,保证了良好的加工工艺和补缩;锁模方式为重力锁模;砂芯采用石英砂,并在表层涂以耐高温涂料;芯盒导套选择一定的锥度,使取模容易;芯盒镶块运用数控加工,降低了生产成本;分度胎具保证了同种规格模具具有良好的互换性,而且因为所有加工基本都可以在普通机床上完成,生产成本低,可以为中小型企业普遍采用;在加工工艺编制过程中,采用两端面互为基准,球腔用专业夹具加工;Autocad,Pro/e分别制作了模具的二维和三维立体图,并运用Pro/e制作了三维动画演示。

The monotypic genus Macrovalsaria previously of uncertain taxonomic position turns out to be a member of Botryosphaeriales and seems to be related to Botryosphaeria. The placement of Neopeckia and of Dothidotthia is in Dothideales and Botryosphaeriales, respectively. The genera Plowrightia and Botryosphaeria as currently defined are not monophyletic. Species of Plowrightia appear to be associated with three genera, Dothidea, Neopeckia and Sydowia; those of Botryosphaeria tested are recognized as three groups.

结果还显示,座囊菌纲中分类地位不确定的属Macrovalsaria与Botryosphaeria的关系相对接近,应该归于葡萄座腔菌目;历史上分类地位有疑问的Neopeckia和Dothidotthia两个属处于不同的目中,前者属于座囊菌目,后者为葡萄座腔菌目的成员;座囊菌目的Plowrightia属并非单系群,该属成员分别与Dothidea、Neopeckia和Sydowia三个属聚类在一起;现行的Botryosphaeria属也非单系群,其属的概念有待澄清。

The method of ultrasonic broaching waveguide entocoele mentioned in th e article is the impulse machining method, in the broaching process the broachin g tool is thrown over the vertical ultrasonic vibration to obviously improve wor king accuracy and surface quality of waveguide entocoele.

本文提出的波导内腔超声推挤方法是一种脉冲加工方法,其实质是在推挤工作过程中,给推刀施加纵向超声频振动,以大幅度提高波导内腔加工精度和加工表面质量。

Results The AVM animal model was successfully created in seven CEMPs, which was similar to human brain AVM in angio-architecture, angiographic-image, embolizing behavior and post embolization pathological findings. Thromboses were found inside the CJA vessels in 4 animals and in the rest 3 the CJA vessels were shrunk without thrombus.

结果在7只CEMPs中成功制作了AVM动物模型,该模型在血管结构、造影影像、栓塞表现和栓塞后病理改变上与人脑AVM的相似。4只动物颈动静脉吻合口血管腔内有血栓形成,其余3只吻合口血管塌陷皱缩,腔内无血栓。

The properties are the dispersion equation of IREBs drifting in the tube, and the transmission line model of IREBs interacting with the gap electrical field of input cavity of RKA and bunching in the drift tube. The expression of modulated current after the gap of input cavity is got, which is content with the experimental results.

建立了IREBs在漂移管中传输的色散方程,以及IREBs与RKA输入腔间隙电场相互作用和IREBs在漂移管中群聚传输的传输线模型,获得了电子束经过输入腔间隙后产生的调制电流表达式。

He affected a fair Irish brogue as a charismatic I.R.A. terrorist in 1997's The Devil's Own.

brogue:爱尔兰腔;1997年,皮特在影片&魔鬼同行&中出演一名爱尔兰共和军战士,模仿的爱尔兰腔还挺像那么回事。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。