内旋

To an asymmetric synthesis of (1), we applied a type of Roush addition in the first step to introduce the C4 stereocenter, and then the chair substance -122 are readily transformed into the title compound -aphanorphine using the same route as to the racemic target molecular.

aphanorphine分子的不对称合成是在第一步通过对甲氧基苯乙醛（119）发生Roush反应引入手性，得到手性高烯丙醇-122，然后利用与合成外消旋目标分子相同的方法，光学纯化合物-122经一系列转化可得到光学纯中间体化合物139；化合物139发生分子内傅—克反应的过程中，由C4位手性立体特异地控制C1位手性的生成，从而解决-aphanorphine分子中的手性问题。

The thermodynamical properties of the two dimensional square lattice and the three dimensional simple cubic lattice transverse Ising model with spin - 1/2 are investigated within the framework of the finite cluster appraximation.

本文在有限集团近似的框架内研究了自旋为1/2的二维平方晶格和三维简立方晶格横场伊辛模型的热力学性质，得到了相应的相图，临界温度和临界横场。

Our discussion is carried out withinthe framework of the modified spin wave theory.

有限温度时，我们的讨论就是在修饰自旋波理论的框架内进行的。

The nucleotide polymorphism existed in the SSU nrDNA gene sequences of species of Chaetoceros.

角毛藻的SSU nrDNA基因组内存在多态性，旋链角毛藻的基因组内多态性平均为0.45%。

The Yushulin oilfield is located in eastern slope of Sanzhao seg of central sag zone in the northern part of Songliao basin. Its main oil-producing formations are Fuyu and Yangdachengzi oil layers of mesozoic group cretaceous. Its reservoir is fluvial facies sediment. Main sandstone is positive circle channel sandstone with calcium in the beneath, and microelectrode curve is box distribution function. Its secondary oil-producing formation is Yaoyi part of Putaohua oil layer. Its reservoir is delta front sediment. Main sandstone is subaquatic distributary channel sandstone, and microelectrode curve is box distribution function.

榆树林油田处于松辽盆地北部中央坳陷区三肇凹陷东部斜坡，主要产油层系是中生界白垩系泉三、四段的扶余、杨大城子油层，储层为河流相沉积，主要砂体为有底钙存在的正旋回河道砂体，微电极曲线形态为箱型；其次为姚一段的葡萄花油层，储层为三角洲内前缘沉积，主要砂体为水下分流河道砂体，微电极曲线形态为箱型。

Because underspin is imparted by a high to low motion, you may be chopping down too severely, which simply sends the ball down into the net.

因为下旋球是藉由高到低的动作来授予，你可能太严重地劈砍下来，那将只是把球往下送进网内。

Especially, when local fans are unwatched, it will bring coal mine potential safety hazard.

目前，对于3.3kV供电的高产高效综合机械化采煤工作面，根据采煤方法的要求，与其配套的掘进方式是三条巷道同时推进，共需六台对旋式局部风机进行掘进通风，三台运行，三台备用，由于设备数量多、占地面积大、连接复杂，故障率较高，频繁引起巷道内"无计划"停电停风，造成瓦斯积聚，特别是在无人值守时，很容易给煤矿的安全生产带来重大隐患。

To evaluate the atomizing properties of the nozzle, an experimental research is performed under different operating pressures by means of the Adaptive Phase/Doppler Velocimeter.

鉴于提高原油加热炉燃烧器的燃烧效率对油田节能降耗有着重要的经济意义，开发了新型内混式气动旋流雾化原油燃烧器喷嘴。

Significant processing steps can include: a phase changes involving either the desired molecule or the solvent, inert carrier or vehicle, e.g., dissolution, crystallization, evaporation, sublimation, distillation or absorption; b a phase separation such as filtration or centrifugation; c any chemical change involving the desired molecule, e.g., removal or addition of water of hydration, acetylization, formation of the salt; d an adjustment of the solution containing the molecule such as adjustment of pH or pO2; e a precision measurement of contained or added BPC components, in-process solutions, recycled materials is performed, i.e., weighing, volumetric measuring, optical rotation, spectrophotometric determinations, etc.; and f changes occur in surface area, particle size, or lot uniformity, e.g., milling, agglomeration, blending.

意义较大的步骤可能会包括：a相变化，包括指定分子或溶剂，惰性载体或溶媒，如溶出作用，结晶，蒸发，升华，蒸馏或吸附；b相分离，如过滤或离心；c涉及指定分子的任一化学变化，如结晶水的除去或添加，乙酰化作用，成盐；d包含分子的溶解的调节，如调节pH或pO2；e 含有或添加原料药组分，过程内溶液，回收物料的精密测量，如，称重，体积测量，旋光度，分光光度测定，等和f 表面，粒度，或批一致性的变化，如磨碎，凝块，混合。

The result showed that: under the loads, sectioning ACL or not had little effect on internal and external rotation angles but had significant effect on anteroposterior displacement of tibia.

结果表明：在负载作用下，切断前交叉韧带与否对胫骨内、外旋角度的影响很小，但对胫骨前后位移的影响则很大。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。