曲率

Considering the curvature effect on hooping of nearest-neighboring carbon atoms of armchair carbon nanotubes, the energy band, density of state and velocity of electron of armchair SWNT were analytically derived by using the tight-binding model and Born-Karman boundary condition.

在考虑曲率效应对扶手椅型碳纳米管最近邻碳原子交叠积分影响的情况下，利用紧束缚模型和玻恩－卡门边界条件解析地推导扶手椅型SWNT的能带、态密度和电子公有化运动速度，对扶手椅型SWNT电子性质的分析发现：考虑曲率效应后扶手椅型SWNT仍然是金属管，但其能带的总能减小，其态密度的导电平台变窄且其电子公有化运动速度变小。

C arbitrarily inequiaxial T-shaped, L-shaped and "十"shaped columns subjected to 792 load conditions is calculated using compiled C++ programme. On the basis of calculation results, the factors influencing the worst load orientation are analyzed and load orientation of the least curvature ductility of three kinds of sections is presented.Furthermore a analysis of failure mechanism for R.

本文采用非线性全过程分析方法，采用C++语言编制了不等肢异形柱截面曲率延性比的计算程序，首先计算了不等肢T形、L形和十字形柱在792种工况下的截面曲率延性比，在此基础上分析了影响不等肢异形柱截面延性的最不利荷载方向的各种因素，并得出了这三种截面不等肢异形柱在上述工况下的截面延性最不利荷载方向。

Diopter, corneal curvature, depth of anterior chamber and the axial length of the eyes were measured. We calculated the concordance of hyperopia, intrapair correlation coefficient and heritability index of monozygous and dizygous twins.

调查了同卵和异卵双生子的屈光度、角膜曲率半径、前房深度、眼轴长度，计算了远视的一致率，同卵和异卵双生子的组内相关系数及遗传指数等项目，证实远视眼是一种多因子遗传病，它的发生除了与多个遗传性状如角膜曲率半径、前房深度、眼轴长度等有关外，还与环境因素有关。

Methods A total of 86 eyes of successful rhegmatogenous retinal detachment with a higher encircling scleral buckle underwent A-scan and keratometer examination before surgery as well as l week,4 and 12 weeks after surgery.The refractive factors included the depth of anterior chamber,thickness of lens,axial length of eye,corneal curvature and refraction of eye were detected pre- and post-operatively.

用眼科超声仪、角膜曲率仪、验光仪等对巩膜环扎加压眼内嵴高为4～6 D的86例原发性视网膜脱离患者的86只患眼手术前1天及术后第1，4，12周时前房深度、眼轴长度、晶状体厚度、眼屈光度、角膜曲率等进行测量并将结果进行比较。

Objective: To determine a accurate method to measure ocular axial length,anterior chamber depth lens thickness and keratometry by calculating degrees of intraocular lens demand.

目的：通过对人眼球轴长、前房深度、晶体厚度和角膜曲率的测定，探讨它们之间的相关性，并把握如何精确测定眼球轴长、角膜曲率来保证人工晶体的正确计算。

But for curved wire ropes, it only utilized depredating helices to derive the curvature components and curvature increment expression method in curved wire ropes in the past. It is incomplete for force-deformation or force-strain relative.

但就曲线型钢索而言，过去仅止於利用退化螺旋线，推导圆弧型钢索中钢绞线之曲率以及曲率增量表示法，对於受力与变形或应变关系之描述不够完整。

The reults show that the recrossing and tunneling effects exist and the corrections by means of CVT method and small curvature approximation method are efficient respectively.

结果表明，反应存在返回效应和隧道效应，反应途径的曲率对隧道效应影响较大，用变分过渡态方法和小曲率近似方法分别进行校正是有效的。

Others were unable to grind mirrors of regular curvature, and to add to the problem, the mirror tarnished and had to be repolished every few months, with the attending danger of damage to the curvature.

其他人无法磨镜定期曲率，并添加到的问题，照镜子，玷污，并已被repolished每隔几个月，与出席的危险损害的曲率。

Utilizing the extremum theory of function to obtain the minimum radius of curvature of theoretical profile, and factors that affecting the minimum radius of curvature were discussed, thus provided theoretical basis for the studies of the continuous contact transmission of swinging movable teethed central gear meshing pair, contact stress and meshing stiffness etc..

利用函数极值理论得到理论廓线的最小曲率半径，讨论了最小曲率半径的影响因素。为摆动活齿中心轮啮合副的连续接触传动、接触应力和啮合刚度等的研究提供了理论基础。

Suppose you are running a car at a constant speed with a constant curvature, if you then keep the steering wheel in the same position and increase the car speed gradually, then if the car wants to run on a circle with a smaller radius the car is said to be oversteering, if it remains on the same radius it is neutral and if the car goes to a wider circle it is understeering (for that speed and curvature!).

假设你以固定的速度沿固定曲率的圆周驾驶车辆，然后你保持方向盘角度不变，逐渐增加车辆的速度，此时车辆行使的半径如果变小，称为转向过度（在这个特定的速度和曲率下！）。这个测试还有不同的做法。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。