过渡

In order to improve the teeth bending strength,the research detailedly introduced several typical dedendum transition curve in machine process and compared to several transition curve through example based on founded tool top circular radius equation.

本文详细介绍了机械加工中常见的几种齿根过渡曲线，为了提高齿根弯曲强度根据建立的各种刀具刀顶圆角半径方程通过实例进行了几种过渡曲线的比较。

The result showed that, with the altitude increasing, the population density increased, distribution range of size class decreased, survival curves changed from Deevey Ⅱ type to Deevey Ⅰ type.

结果表明，随海拔升高，黄山松种群密度增大，径级分布范围减小，种群存活曲线由Deevey-Ⅱ型之间过渡到Deevey-Ⅰ型，种群由稳定型过渡为增长型。

Through defining the concept of transition process time constant for a continuous autonomous dissipative chaotic system, the relationship between transient characteristics of these chaotic systems and corresponding dissipativity is explained theoretically, and then an explicit formula for calculating the transition process time constant is established.

通过确立连续自治耗散混沌系统过渡过程时间常数的概念，从理论上阐明了这类混沌系统的瞬态特性与其相应的耗散度之间的关系，从而建立了计算过渡过程时间常数的显示关系式。

Study shows that environment evolution and eustatic change of Holocene in this area may be divided into 6 stages:① early stage of early Holocene, 9 100~10 900 aBP,when sea level was low and this area was an oxidizing environment or oxidizing-reducing transition environment;② late stage of early Holocene, 8 000~9 100 aBP, sea-level rising,...

研究表明，本区全新世环境演化分为6个阶段：①早全新世早期，10900~9100aBP，海平面较低，尚未淹没本区，为近岸氧化环境或氧化—还原过渡环境；②早全新世晚期，9100~8000aBP，海水上涨，本区时淹时退，为浅海或潮坪环境，生物钻孔发育；③中全新世主体，8000~4150aBP，海平面快速上升，完全淹没，Fe2+/Fe3+介于0.7395~1.9123之间，为全新世中最高段，表明还原程度强、全球气候变暖；④中全新世后期，4150~2850aBP，海水有所下降，仍为浅海环境，Fe2+/Fe3+较高，多在1.0以上；⑤晚全新世，2850~1310aBP，海平面进一步下降，本区时常暴露，其中2150~1310aBP以还原环境为主，为潮下带，2150~2850aBP以氧化—还原过渡环境为主，为潮间带；⑥1855AD以来，海平面基本稳定，稍有上升，为现代黄河三角洲沉积时期。本区全新世至少存在5期冷热交替的旋回性气候变化。

To improve the economy, larger bypass ratio has been adopted in the turbofan engine design, leading to a larger fan high, larger speed gap between HP and LP turbines, the meridian geometry of the engine will be excurvature at a high degree, which brings problem for the design of LP turbines, transition section between HP and LP turbines.

在现代高性能的航空涡扇发动机设计中，为了提高经济性，采用较大涵道比，导致风扇高度增加较大，高低压涡轮转速差距较大，高低压过渡段采用大子午扩张型线结构，给低压涡轮及过渡段气动设计带来较大的困难。

The results showed:(1)The flora of community is rich and complex,and it belongs to the transitional zone for many genera,the subtropical-temperate zone geographical composition of genera are dominant,about 51.47% of the total genera,and there are characteristics which form subtropical to temperate zone transition.(2)The species are mostly composed of Fagaceae,Lauraceae,Anacardiacea...

结果表明(1)该群落区系组成比较丰富和复杂，属于许多属的过渡地带，具有从亚热带向温带过渡的特征；(2)种类组成以壳斗科、樟科、漆树科、卫矛科、榆科、五加科、金缕梅科等为主，但优势种、建群种以温带属为主；(3)种群生活型谱以高位芽占绝对优势，群落垂直结构明显。

We have synthesized fourdioxotetraamine ligand appended with fluorenyl group and their transition metal complexes.The crystal structures of the complexes were determined by x-ray diffraction. Stability,electrochemistry and switch properties in aqueous solution was studied by pH-potentiometricand fluorimetric titration as well as cyclic voltammetry.

合成了带侧链荧光基团—芴的二氧四胺配体及其过渡金属配合物，测定了过渡金属配合物的晶体结构，研究了他们在水溶液中的稳定性、电化学性质和荧光开关性质。

The endogenous phytohormones of fissurate growth species-Reaumuria trigyna Maxim, Reaumuria soongorical Maxim and unfissurate growth species-Helianthemum soongoricum Schrenk living in the same place was studied.The contents of IAA, ZR are higher in the fissurate place of Reaumuria trigyna Maxim; The contents of GA3, ZR are higher in the fissurate place in Reaumuria soongorical but the content of endogenous phytohormones are higher in seedling of Helianthemum soongoricum Schrenk ,which illuminates endogenous phytohormones are higher in the actively growing parts and probably adjust the fissurate growth.

对同一生境条件下进行劈裂生长的长叶红沙、红沙和无壁裂生长现象的半日花内源激素的研究发现，长叶红沙在刚刚开始劈裂的过渡植株的壁裂发生部位累积IAA和ZR，红沙在刚刚开始劈裂的过渡植株的壁裂发生部位累积GA：；和ZR，半日花则是幼苗茎基部的激素含量较高，说明内源激素在生长旺盛部位含量较高，对劈裂生长的发生具有一定的调控作用。

Both catalytic activity and selectivity of Ru(PPh_3)_3Cl_2 were improved in ionic liquid BMImPF_6/DME medium.The conversion of hexene and selectivity ofβ-adduct for the hydrosilylation reaction of 1-hexene with triethoxysilane catalyzed by Ru(PPh_3)_3Cl_2 in ionic liquid BMImPF_6DME (V/V=1/4) medium at 90℃were 100% and 89.0%,respectively.

实验结果表明，在乙二醇二甲醚/离子液体1-丁基-3-甲基咪唑六氟磷酸盐(BMImBF_6)(V/V =1/4)介质中，于90℃下，己烯与三乙氧基硅烷反应的转化率为100%，β加成物的选择性可达89.0%，而用Rh(PPh_3)_3Cl作为反应的催化剂，在纯离子液体BMImPF_6中，就可以高效催化烯烃与三乙氧基氢硅烷的加成反应，过渡金属Rh(PPh_3)_3Cl，Ru(PPh_3)_3Cl_2催化剂/离子液体BMImPF_6催化体系，不仅解决了产物与催化剂分离困难这一难题，同时，离子液体BMImPF_6的存在提高了过渡金属Rh(PPh_3)_3Cl，Ru(PPh_3)_3Cl_2催化硅氢加成反应的活性，特别是β加成物的选择性。

In front of West Kunlun from south to north, the main tectonic patterns are fault and fault-related-fold, which changed from imbricated thrust to decollement structure and from basement involved to cover detachment fold.

西昆仑山前构造变形区的构造样式为断裂及其断层相关褶皱，变形顺序总体由前展式自后陆向前陆扩展，变形方式自南而北从叠瓦状逆冲向滑脱挤压过渡，从基底卷入式向盖层滑脱式过渡。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失