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s形     
相关语句
  s-shaped
     Study on experiment and technological parameter optimization in forming S-shaped pieces
     S形件成形工艺参数优化及实验研究
短句来源
     Discussion on the plain bearing material for the S-shaped valve on concrete pump
     混凝土泵S形管阀滑动轴承材质探讨
短句来源
     Technological parameter optimization design was researched by combining ANN and GA in forming S-shaped pieces.
     把人工神经网络(ANN)和遗传算法(GA)相结合进行工艺优化设计,研究了S形件翻边成形中的工艺参数优化。
短句来源
     Calculation of Boundary Layer of a Three Dimensional S-Shaped Inlet
     S形进气道附面层计算
短句来源
     2. There are obvious changes in the S-shaped active filaments relevant with the flare before and after the flare eruption, and all of the filaments disappear at last.
     2.和耀斑有关的S形活动暗条在耀斑爆发前后有明显变化,最终全部消失。
短句来源
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  s shaped
     Digital MRH Controller and the Theory of S Shaped Speed Curve
     数字式MRH主令控制器和S形速度曲线的原理
短句来源
     Development of the S Shaped Series Rolled Steel Wheels in Our Country
     我国S形系列辗钢车轮的研制与开发
短句来源
     Finite element analysis of blending process in S shaped rotor long continuous mixer
     S形转子长型连续混炼机混炼过程的有限元分析
短句来源
     The theory and method for the digital MRH and S shaped speed curve are also introduced here.
     对数字式MRH及S形速度曲线的原理与实现方法作了概要介绍。
短句来源
     A finite elem ent method of the blending process of LCM with S shaped rotors by using ANSYS software was introduced.
     采用ANSYS有限元分析软件对S形转子LCM混炼过程进行了分析。
短句来源
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  s-shape
     In the pH range from 3.5 to 7.5,Cu adsorption in the two soils increases wit h increasing pH,and shows as of S-shape.
     pH 3 .5~ 7.5范围内 ,土壤对铜的吸附量均随溶液pH的升高而升高 ,呈现S形
短句来源
     S-Shape Wire Wrapping Techniques for Suspension Bridge of Runyang Bridge
     润扬大桥悬索桥S形钢丝缠丝技术
短句来源
     Horizontal Forging Technology of S-shape Cam
     S形凸轮的平锻工艺
短句来源
     On the Dynamic and Static Analysis of Tall Building with S-Shape Shear Wall
     S形剪力墙结构高层建筑的动力与静力分析
短句来源
     The output curve of a product is generally S-shape curve during its economic life period.
     个别产品的产值 (产量 )曲线在其经济寿命周期里一般是一条S形曲线。
短句来源
更多       
  s shape
     Finite element analysis of the flow field of S shape twin rotor continuous mixer
     S形转子连续混炼机混炼段流场的有限元分析
短句来源
     Relative reduction of specimen length is called equivalent plastic compressive strain ε. The result indicates that ε increases linearly with θ when θ is below Ac1 or above Ac3. ε increases obviously with θ increases when θ is between Ac1 and Ac3. The slope of ε - θ curve when θ < Ac1 is less than that when θ> Ac3. The ε - θ curve approximately shows S shape when θ is between Ac1 and Ac3.
     结果表明:当焊接温度θAc3时,ε随θ的升高呈线性增大,在Ac1-Ac3之间,ε随θ的升高而明显增大; ε-θ曲线在θAc3时的斜率,在Ac1-Ac3之间,ε-θ曲线近似呈S形
短句来源
     A variation of complex viscosity of PTT/PBT blends with composition shows positive-negative deviations from the log-additivity rule and the viscosity-composition curves reveal an S shape. The minimum and maximum complex viscosity are found when PBT content is 10% and 90% weight fraction, respectively.
     PTT/PBT共混物的复数粘度随着PBT含量的变化出现了正—负偏差,曲线成S形,在PBT含量为10%时复数粘度出现极小值,之后升高,在PBT含量为90%时出现极大植。
短句来源
     The results showed that rumen bacteria could specially bind with 17β-estradiol with an S shape saturation curve.
     结果表明:瘤胃细菌可专一性地结合17β-雌二醇,并出现饱和现象,饱和曲线呈S形
短句来源
     Repair of serious trauma of hand with upper abdominal S shape cutaneous flap
     上腹部S形皮瓣一次性修复手部严重创伤
短句来源
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  s-shaped
Experiments on developing eggs of European pond turtle (Emys orbicularis) demonstrated S-shaped changes in the rate of oxygen consumption and body weight during embryonic development.
      
Results are given of the numerical solution of the equations which describe in the quasione-dimensional approximation the motion of a fluid in a pipe made of a viscoelastic material with a nonmonotonic S-shaped static characteristic curve.
      
Analysis of Three-Dimensional Turbulent Flow in an S-Shaped Rectangular Channel
      
Three-dimensional Reynolds equations are used to calculate a turbulent flow in an S-shaped rectangular channel, which was experimentally investigated by Bruns et al.
      
Some differences are observed only downstream of the inflection point of the S-shaped walls, where a velocity profile with two-way downwash is realized.
      
更多          
  s shaped
A dual S shaped micro strip antenna with a realistic feed is proposed for generation of tilted beam radiation pattern pertaining for beam steering applications.
      
From the fact that the "ratio of ion exchange(%)-pH" graph is an "S shaped" curve, it is possible to deduce that the chemical reaction is of the nature of cation exchange.
      
The young bird grows very fast during the first days of its postembryonic life, the classical S shaped growth curve being steep in the beginning.
      
The shape of zeta-potential-log10 concentration curves was found to be of S shaped.
      
Also, the locus of disc landing position as a function of launch roll angle has been shown to be an 'S' shaped curve, with the straightest flight occurring for an initial roll angle of-6°.
      
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  s-shape
The S-shape of the curve of AE-act flow is physically interpreted.
      
The S-shape of the curve of AE-act flow is physically interpreted.
      
There are large cross-flow velocities and S-shape temperature distributions in the recirculating region of solitary wave.
      
Localization of carriers (excitons) is demonstrated by the "S-shape" dependences of the PL peak energies on the temperature.
      
The internationalization-performance relationship at Swiss firms: A test of the S-shape and extreme degrees of internationalizat
      
更多          
  s shape
The different locations of the driving tip on the horn cause different elliptical-shaped vibration trajectories, and how the trajectory's shape variation influences motor mechanical output is studied by using the FEM method.
      
We describe a new technique for nuclear-radiation spectrometry and identification by the pulse's shape in CsI(Tl) scintillators.
      
The ohmic component R of an underground pipeline insulation resistance is estimated in terms of the number and size distribution of the insulation through defects; the dependence of R on the defect's shape is shown.
      
Recommendations are made to improve identification of a flaw's shape and type via relationships between test signatures and to assess parameters involved in calculations of the strength and service life of a tested item.
      
The difference of the instantaneous frequency from the rated frequency depends on the reflector type and can be used as an informative indicator of a flaw's shape.
      
更多          
  其他


In this paper, a method for the systematic and quantitative evaluation of the inductive effect exerted over a certain chemical bond in the molecule by a group, from the electronegativities and the atomic radii of its constituent elements, has been presented. The constant for the inductive effect of the group thus obtained is designated as the inductive effect index of the group. It has been found that for a given reaction, the energy changes, the logarithms of the equilibrium constants, and the logarithms of...

In this paper, a method for the systematic and quantitative evaluation of the inductive effect exerted over a certain chemical bond in the molecule by a group, from the electronegativities and the atomic radii of its constituent elements, has been presented. The constant for the inductive effect of the group thus obtained is designated as the inductive effect index of the group. It has been found that for a given reaction, the energy changes, the logarithms of the equilibrium constants, and the logarithms of the rate constants can be expressed, respectively, as linear functions of the corresponding inductive effect index involved in the reaction, and that the percentages of chemical changes in the reaction, such as percent yield and conversion, give "sigmoid" curves when plotted versus the latter. These linear functions and sigmoid curves constitute a general quantitative relationship between molecular structure and chemical reactivity.

本文中提出由元素的电负性及原子共价半径两种基本常数以系统计算非共轭体系中基团诱导效应的方法,所得出的诱导效应指数与非共轭化合物在各种反应中的能量变化,平衡常数对数与速度常数对数均形成直筱关系。反应中化学变化的百分率,如产率及转化率等,则与诱导效应指数形成S形曲线。在计算方法中,共价键A—B的极性,以两成键原子的电负性分数,xA/xA+xB,及xB/xA+xB之差δ(键极性指数)表示。一键对于邻近各键上的诱导效应,以这键上的极性强度δ/r,为计算基数,其中r为键的长度。在一非共轭体系中,作用于A—B键的诱导效应,以直接或间接联结于A—B的各键的极性强度,依照远近次序相加的总和i表示: 或简写为其中1,2,3,4……代表各键联结于A—B上的次序,a是代表诱导效应传递时递减率的常数。与A—A键比较,由B原子及其所带基团对于A—B键上所产生的极性效应,以包括B原子在内的全部基团对A—B的诱导效应指数I表示: 如果分子中B,C,…等原子带有形电荷N_1,N_2…等,则除计算i值时应采用由于电荷而校正的原子电负性及共价半径外,还应加由电荷所引起的诱导效应i_+或i_-: 其中r′是带电荷的原子的共价半径;因此...

本文中提出由元素的电负性及原子共价半径两种基本常数以系统计算非共轭体系中基团诱导效应的方法,所得出的诱导效应指数与非共轭化合物在各种反应中的能量变化,平衡常数对数与速度常数对数均形成直筱关系。反应中化学变化的百分率,如产率及转化率等,则与诱导效应指数形成S形曲线。在计算方法中,共价键A—B的极性,以两成键原子的电负性分数,xA/xA+xB,及xB/xA+xB之差δ(键极性指数)表示。一键对于邻近各键上的诱导效应,以这键上的极性强度δ/r,为计算基数,其中r为键的长度。在一非共轭体系中,作用于A—B键的诱导效应,以直接或间接联结于A—B的各键的极性强度,依照远近次序相加的总和i表示: 或简写为其中1,2,3,4……代表各键联结于A—B上的次序,a是代表诱导效应传递时递减率的常数。与A—A键比较,由B原子及其所带基团对于A—B键上所产生的极性效应,以包括B原子在内的全部基团对A—B的诱导效应指数I表示: 如果分子中B,C,…等原子带有形电荷N_1,N_2…等,则除计算i值时应采用由于电荷而校正的原子电负性及共价半径外,还应加由电荷所引起的诱导效应i_+或i_-: 其中r′是带电荷的原子的共价半径;因此总的诱导效应指数是 I=i_0+i+i_±由这样计算出的诱导效应指数,可以正确推出英国学派的全部耢导效应序列及Kharasch等的脂肪基团的相对电负性序列。这指数与Taft的取代基极性常数σ~*基本上完全平行,与由其他方法算出的氢化物中氢的部分电荷也基本上平行。它与脂肪族卤化物及腈类等的电偶极矩形成良好的直线关系。这些事实都说明诱导效应指数能够定量代表有关的诱导效应。非共轭化合物中化学活性与诱导效应之间的关系,可以下式表示: E=AI+B logK=aI+b或log(K/K_0)=aI logk=a′I+b′或log(k/k_0)=a′I 其中E为反应中的能量变化及与键能有直接关系的能量性质,K为反应平衡常数,k为反应速度常数;A,B,a,b,a′,b′均为常数,其值由反应类型及反应条件决定。在很多情况下,用为基准的氢原子也包括在这种关系之内。文中列举各种类型的有机及无机化合物的几百种E,K及k以表明上述几种直线关系的普遍存在。文中讨论诱导效应指数的适用范围,指出在基团立体障碍很大与立体效应不相同的情况下,及共轭效应起主导作用,而又不恒定的情况下,诱导效应指数与化学活性之间并无上述的几种直线关系。最后文中讨论诱导效应指数的用途。一是建立一种统一的定量的诱导效应序列,二是直接表达分子结构与化学活性间的定量关系,三是验证化合物的分子结构式,四是区别分子中不同位置上同种基团的活性,五是推断某些反应的机构,并各以例说明。

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研究了不同类型油菜品种外部器官的形成、生长与体內醣、氮及脂肪代谢的关系。产量以甘兰类型较白菜类型高。叶面积高峯出现在盛花期前后,净同化率呈“S”形曲线。现蕾抽苔期醣代谢起着主导作用,绝大多数同化产物分配在茎中,同时需肥最多。种子成熟过程含油量的增长,主要由醣转化而成。

The cells of the apical ectodermal thickening, neighboring ectoderm and underlyingmesenchyme of the limb buds of mouse embryos, 11--13 days vaginal plug age, wereused for this study. Most of the specimens were fixed in 1% osmic acid in veronalacetate buffer, pH 7.6, 4℃, 1 hour and embedded in methylchrylate. Parts of the speci-mens were either fixed in potassium permagnate or stained in lead hydroxide after osmicacid fixation. Observations and photographs were made under SEM Ⅲ electron micros-cope. The Golgi...

The cells of the apical ectodermal thickening, neighboring ectoderm and underlyingmesenchyme of the limb buds of mouse embryos, 11--13 days vaginal plug age, wereused for this study. Most of the specimens were fixed in 1% osmic acid in veronalacetate buffer, pH 7.6, 4℃, 1 hour and embedded in methylchrylate. Parts of the speci-mens were either fixed in potassium permagnate or stained in lead hydroxide after osmicacid fixation. Observations and photographs were made under SEM Ⅲ electron micros-cope. The Golgi apparatus appeared to be horse-shoe shaped in the apical ectodermalthickening and S-shaped in the neighboring ectoderm. It consisted of small vesicles andtubules without any large vesicle. The mitochondria in the neighboring ectoderm were usually round or oval in shape,with fewer and irregular cristae and lighter matrix. The mitochondria of the mesenchy-mal cells were even more embryonic in structure with only 2--3 oblique cristae and alarge inner chamber. The mitochondria in the supperficial layers of the apical ectoder-mal thickening were more or less similar to those in the neighboring ectoderm. Rod-shaped and filamentous mitochondria increased in number in the deeper layers of theapical thickening. Such filamentous mitochondria had vertical cristae, denser matrix andoval and light inner chambers. Transitional stages between the very small vesicles withvague cristae and the large mitochondria with distinct cristae were found in our leadstained preparations. Except in the Golgi region, ribosomes grouped into ring or tubular forms weredistributed all over the cytoplasm in the three kinds of the embryonic cells studied.Transitional stages between such ribosome clusters and the granulated vesicles and tubulescould be clearly demonstrated in the lead stained specimens. In the apical ectodermal thickening, granulated endoplasmic reticulum in the formof scattered small vesicles and tubules seemed to be more abundant than in the neighbor-ing ectoderm and underlying mesenchymal cells. But the most striking difference foundin the apical thickening was the expansion of the granulated endoplasmic reticula intolarge saccules, the cisternae of which containing a grayish dense substance. Another interesting phenomenon found in the apical ectodermal thickening was thepresence of dense bodies in the cytoplasm. They were in various sizes and densitieswith dense granules, masses or cords and various forms of vesicles. They might be round,oval or irregular with a complete, partial or entire absence of limiting membrane. Thosewithout membrane were usually irregular in form and could hardly be demarkated from their surrounding cytoplasm whence assembly of ribosome clusters, mitochondria andendoplasmic reticulum from the surrounding cytoplasm to form the dense bodies could befound. Preliminary histochemical studies found them to be positive in alkaline and acid-phosphatases and RNA staining. They were therefore considered to be lysosomes orcytosomes. The significance of the differences in mitochondrial form and structure, abundantand expanded cisternae of the granulated endoplasmic reticulum and the presence of thedense bodies in the apical ectodermal thickening in relation to embryonic differentiationof the limb was discussed.

用小白鼠胚胎阴栓日龄11—13天的前肢芽和后肢芽,锇酸固定,甲基丙烯酸甲酯及甲基丙烯酸丁酯包埋,在SEM Ⅲ型电子显微镜观察了肢芽尖端增厚外胚层、邻近普通外胚层及间充质细胞。部分材料用过锰酸钾固定或锇酸固定后氢氧化铅染色。各种细胞相互比较的结果如下: 1.两种外胚层的高尔基体极相似,均由小泡及小管组成,无大泡,横切时成为成群的小泡。普通外胚层细胞的高尔基体呈S形,增厚外胚层的马蹄形。 2.线粒体在普通外胚层卵圆形或圆形,嵴不整齐。增厚外胚层的线粒体在浅层细胞少,结构与普通外胚层相似,但愈至深层则细长的线粒体愈多。细长线粒体的嵴较密,亦较整齐,与表面垂直,基貭亦较致密。在尖端增厚外层细胞见到由胞质新形成的小泡过渡到小圆的线粒体。 3.无论在普通外胚层下或在尖端增厚外胚层下的间充质细胞,其线粒体的形状和结构相同,都是圆或卵圆,嵴少而靠近表面作半月状,内室大,基貭密度低,属比较原始的胚胎型。 4.嗜碱质在两种外胚层及间充貭细胞均以弥散的核朊粒为主,由5—10余粒组成小群落。这些群落在尖端增厚外胚层较大、较密,粒亦较多。普通外胚层细胞的有粒内貭网或动貭较间充貭为多,二者均系胚胎型,是分散的小泡或小管。尖端...

用小白鼠胚胎阴栓日龄11—13天的前肢芽和后肢芽,锇酸固定,甲基丙烯酸甲酯及甲基丙烯酸丁酯包埋,在SEM Ⅲ型电子显微镜观察了肢芽尖端增厚外胚层、邻近普通外胚层及间充质细胞。部分材料用过锰酸钾固定或锇酸固定后氢氧化铅染色。各种细胞相互比较的结果如下: 1.两种外胚层的高尔基体极相似,均由小泡及小管组成,无大泡,横切时成为成群的小泡。普通外胚层细胞的高尔基体呈S形,增厚外胚层的马蹄形。 2.线粒体在普通外胚层卵圆形或圆形,嵴不整齐。增厚外胚层的线粒体在浅层细胞少,结构与普通外胚层相似,但愈至深层则细长的线粒体愈多。细长线粒体的嵴较密,亦较整齐,与表面垂直,基貭亦较致密。在尖端增厚外层细胞见到由胞质新形成的小泡过渡到小圆的线粒体。 3.无论在普通外胚层下或在尖端增厚外胚层下的间充质细胞,其线粒体的形状和结构相同,都是圆或卵圆,嵴少而靠近表面作半月状,内室大,基貭密度低,属比较原始的胚胎型。 4.嗜碱质在两种外胚层及间充貭细胞均以弥散的核朊粒为主,由5—10余粒组成小群落。这些群落在尖端增厚外胚层较大、较密,粒亦较多。普通外胚层细胞的有粒内貭网或动貭较间充貭为多,二者均系胚胎型,是分散的小泡或小管。尖端增厚外胚层的动貭有独特形态,即池的一端扩张成大泡,内含网状致密物,显然含有较多的,要不是特异的蛋白貭。这种扩张动貭对于胚胎分化及诱导的关系曾加讨论。 5.动质的形成有证据表明是先从核朊粒群落出现膜成为动貭小泡或小管,再并合成较大的小泡和较长的小管。 6.增厚外胚层细胞的另一特点是比较普逼的存在着形状、大小及密度不同的致密体。有的完全致密,有的泡状,有的是二者的混合体,有的界限清楚,有的处于分散状态。在形态上类似溶酶体和卵子的多泡体。内含类似核朊粒的致密粒、退化线粒体及动质膜。这些致密体和细胞膜、核膜及高尔基体未显有何关系。基膜及细胞膜完好。未见增厚外胚层细胞有排出、吞食或饮液现象,亦未见致密体排至中胚层,故认为这些致密体起于胞貭。对于分化诱导关系曾提出讨论。 7.细胞核及核膜在三种细胞未见有显著不同。核膜有孔,其外膜可与动貭膜相连,核仁小,紧靠核膜,未见有排出现象。氢氧化铅染色的标本有时显示染色貭有微丝,这在胞貭核朊粒群落亦可出现。 8.细胞膜完整,比较直,膜的内侧有一层致密物貭,无桥粒。

 
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