曲线

A necessary and sufficient condition for the curve being torsion curve in every sub-interval is given.

当张力参数趋于零或趋于无穷大时的极限曲线，分别是等距节点的有理三次B样条曲线和其控制多边形，故张力参数可用于调节曲线的光顺性。

By the use of Circling cluster and Envlopment theory and flat surface sit-mark transformation theory, the chain wheel tooth equation of roller chain at high speed to match conjugage engagement is deduced.Establishing chain speed equation of roller chain at high speed,based on the analysis of the speed curves between roller chain at high speed and common roller chain,good drive of roller chain at high speed is verificated theoretically.By a example that move distance from transverse vibration between roller chain at high speed and common roller chain is contrasted,the accuracy of those theories that the paper brings up and higher functions of roller chain at high speed is proved.Finally, Establishing conjugage engagement line equation of roller chain at high speed and analyzing the complete engagement zone, the chain wheel tooth curve equation is studied at a higher degree. At the same time,the lack's place of the research result is pointed out.

依据高速滚子链设计要求与H_y-V_0齿形链的研究，阐述了滚子链传动实现准共轭啮合理论可能性；利用圆族包络法结合平面坐标变换理论推导出了满足共轭啮合的高速滚子链的链轮齿廓曲线；建立起高速滚子链链速方程，通过对高速滚子链与普通滚子链链速曲线的对比分析，从理论上验证了高速滚子链具有良好的传动性能；最后，建立起高速滚子链共轭啮合线方程，对其整个啮合区间进行了分析，进一步研究了链轮齿廓曲线方程，确定了主要参数的设计方法的问题，并同时指出了不足之处。

The angle of rotating mass of a crankshaft-connecting rod and the ratio of rotating mass and to-and-fro mass are important parameters.

讨论了曲柄连杆机构的理论惯性力曲线和实验惯性力曲线(力8字)的关系，提出在摆架上逐点偏移汽缸进行惯性力实验的方法，得到的实验惯性力曲线完全反映了惯性力的主要参数。

A three-span continuous curved box girder bridge model was made to meet the specific requirements of the research work of this paper.

制作了一个三跨混凝土曲线箱梁桥模型，基于合理的试验流程安排，进行多工况下的普通连续曲线箱梁桥和整体式桥台连续曲线箱梁桥的剪力滞效应试验，得到两种桥型在试验工况下的剪力滞系数。

To reveal the complicated stress state of masonry structure in project and the effect of normal stress on shearing behavior,failure form and shearing strength,the shearing strength was obtained through experiments on 54 pieces of minitype sand-lime autoclaved aerated concrete masonry subjected to different normal stress.

为了解砌体结构在实际工程中所处的剪压复合的复杂受力状态，作用在砌体上的正应力对砌体的抗剪性能、砌体的剪切破坏形态及其对砌体抗剪强度的影响，对54个小型灰砂蒸压加气混凝土砌体进行静力抗剪试验，通过施加不同的正应力得到相应的抗剪强度；分析其破坏机理，归纳得出剪摩、剪压、斜压等破坏形态，并与砖砌体的破坏形态进行比较；根据试验结果回归分析得到灰砂蒸压加气混凝土砌体的静力剪压相关性曲线，与砖砌体的剪压相关性曲线进行对比分析，得到两者的异同；在静力剪压相关性曲线的基础上，依据变摩擦系数的剪摩理论，提出灰砂蒸压加气混凝土砌体静力抗剪强度的建议公式，并对摩擦系数进行了简化

Soil water characteristic curve was measured with a sand column for both drying and wetting processes,and the data were used to fit the van Genuchten model.

0引言非饱和土壤水的吸力是土壤含水率的函数，其关系曲线称为土壤水分特征曲线或土壤持水曲线。

Soil water characteristic curve was measured with a sand column for both drying and wetting processes, and the data were used to fit the van Genuchten model. The fitted curve is in good agreement with the actual measurements, residual water content and other factors used in the van Genuchten model were obtained. For the sand studied,. The results from this study may provide reference for research of water and solute movement in unsaturated soil.

利用Van Genuchten模型对用砂性漏斗测量中砂的吸湿过程和脱湿过程土壤水分特征曲线进行拟合，结果表明实测曲线和拟合曲线吻合很好，并得出Van Genuchten模型中的残余含水量、特性参数α和n，模拟计算表明，中砂有α=1.69α的关系，为研究水分和污染物在非饱和土壤中运移问题提供土壤水分运动键参数。

The concentration-response curve of GABA was shifted downward by hypotonic without any change of the threshold value.The values of two curves were very close(33.02μM and 29.41μM). Hypotonic decreased the maximal amplitude of IGABA by(31.38±2.13)%.③This inhibitory effect was reversed by ruthenium red, a nonselective TRPV4 receptor antagonist, and was increased by 4ɑ-PDD, a selectively TRPV4 receptor agonist.

低渗透压+GABA的量效曲线较单独的IGABA量效曲线明显下移，而两者的阈值和最大反应浓度基本不变，分别为10μM和1000μM；两条曲线的EC50值非常接近，分别为29.41μM和33.02μM；预加低渗透压后最大反应浓度时，IGABA的幅值减少了(31.38±2.13)%。

From this, we can analyze the distribution rule of interaction force between pile and rock and give mathematical regress equation of curve.

5绘制结点应力与抗滑桩埋深关系曲线，分析曲线得出桩土间作用力分布规律，并求出曲线的数学回归方程。

Through the characteristics analysis of compound curves for road project , it was proposed that the complex line forms can be simplified to straight line, circular curve and complete transition curve, it was also proposed that the middle and side piles can be used to lay off the control piles of the road construction,and fx-4500P calculator can be used for programming of laying off calculation.

通过对道路工程复曲线特征分析，提出复杂线形可简化为直线、圆曲线和完全缓和曲线三种线形，以及道路工程施工控制桩可采用中、边桩的办法进行测设的两种观点，并用fx-4500P计算器编写测设计算程序。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。