等环的

In this paper a method for design of constant phase shift network, which can be used to improve the dynamical characteristics of feedback systems with variable open-loop gain, has been proposed.

本文讨论用于改善开环增益可能会有较大变化的反馈系统的动态特性的"等相移网络"的设计方法，并采用了优化的计算程序来求出极、零点的最佳位置，从而得到了一个在计算机上实现的最优设计法。

However, the spectral stability was increased, and the 0-1 transition and the full width at the half-maximum of photoluminescence spectra was decreased with the increase of the alkoxy length on phenylene. The nature (e.g. electron-donating and electron-withdrawing) of the substituted side groups on phenylene has obvious effect on the optical properties, QY and electrochemical properties of the polymers.

苯环上取代侧基的给吸电子性质变化对聚合物的光电性能具有全面的影响，改变取代侧基的给吸电子性质可调节芴苯共聚物的发光颜色和HOMO、LUMO能级以及HOMO-LUMO能隙等，因此，通过引入不同性质的侧基可以实现对此类聚合物光物理性能的调控。

As a leading exporter and manufacturer of 100% human hair products in xuchang, china, we could supply you all kinds of human hair products, include 100% human hair weaving and bulk, are silky, yaki, ndw, super, body, jerry curl, water weaving, bebe curl, nail hair and stick hair, and also for all kinds of tools for human hair extensions like hair iron, needle, plier, hair weaving bond and remover, glue stick and remover, glue grains, hot pot, micro rings, copper rings, glue gun, wigs(for 100% human hair and synthetic hair), mannequin head and hair clips etc.

作为全球领先的出口商和制造商的100 ％人发产品在许昌，中国，我们可以为您提供各种人类头发的产品，包括100 ％的人的头发编织和批量，是乌骨鸡，烧， ndw ，超，身体，杰里曲，水编织，贝贝卷发，头发和指甲坚持的头发，也为各类工具，像人的头发延长头发铁，针，镊子，头发编织债券和卸妆，胶棒和卸妆，胶水谷物，火锅，微环，铜戒指，胶枪，假发（ 100 ％人类头发和合成的头发），模特头，发夹等

This instrument used the parallel p late capacitor to measure relative dielectric constant of film, which equaled to the ratio of the capacity value full of film and the capacity value full of air. It app lied the equipotential ring technology to reduce the error caused by edge effect in the two p late edges, and greatly increased the measurement p recision and accuracy.

该仪器采用将平行板电容器充满薄膜的电容值与充满空气的电容值相比的方法得出薄膜的相对介电常数，并采用等位环技术，减小了两极板在边缘处产生边缘效应所带来的误差，大大提高了测量的精度和准确性。

After created qualified grids, discretized physical characteristic, we computed the temperature and velocity field within the standard Model by utilizing CFD techniques. The thesis focuses on the temperature design of supply air, the influence on the platform brought by stopcock wind and local exhaust and the possibility of actualizing the VAV system.

在研究过程中运用CFD模拟的方法，选用标准湍流模型作为物理模型，在优质的网格生成的基础上，对所要研究的物理量进行离散化处理；并就空调送风温度的设定、活塞风、局部排风对站台热环境的影响、全天VAV环控方案实现的可能性等作了详细的理论研究与模拟分析。

Researchment on Cable Dome begin with the Concept Design, which including geometric stability, ratio of rise to span, space between struts, height of struts, space between strop, inclination between ridge cable, etc.

对索穹顶结构设计技术的研究首先从概念设计开始，概念设计包括结构的几何稳定性判断、跨度和矢高的关系、压杆的间距、压杆的高度、环索的间距、脊索间夹角等，后面几个部分其实也可以归结为结构几何参数的优化问题。

Firstly, the developing principles of the cylindrical internal helical gear are proposed through analyzing the movement and geometry requirements, which provides continuous contact between the mating gear surfaces. The tooth surface of the internal helical gear in the new gearing can be imagined as being generated by the normal section of the conjugated surface of the ball-tooth, moving along the radial projection of helix line of the tooth-root circle. Also, the proposed surface can be approximate tangent to the conjugated surface of the ball-tooth along a spacial curve.

首先，通过分析保证行星轮作螺环运动时与内斜齿轮实现连续啮合传动的运动和几何条件，提出了圆柱内斜齿轮齿面的两种形成原理：即由球齿运动包络曲面的法截面沿其齿根圆螺旋线在径向的投影进行拓展所形成的内齿面，以及与球齿运动包络曲面呈近似相切接触的等螺距齿面构成的内齿面。

The results demonstrate that ACM-A is capable of intercalating between the base pairs of DNA double helix, the π-π electronic overlapping between π-electron of ACM-A and DNA stabilizes the ACM-DNA adduct, and through electrostatic interaction, the trisaccharide interacts with the minor groove of DNA owing to C(3') amino group.

实验结果表明，ACM-A主要以其蒽环平面嵌入DNA双螺旋碱基对之间，发生-等电子间相互共轭，同时药物糖基上C3'位的-N(CH3)2基团带正电荷，易与带负电荷的磷酸骨架产生静电吸引，从而发生沟槽作用，嵌入DNA的小沟区，这是二者之间的主要结合模式。并且，DNA与ACM-A药物原型的亲和力要强于还原后的药物代谢产物。

It demonstrated that the hydroxy organic acids substituted with-OH,-SH at α—C such as lactic acid, Hydroxy-acetic acid, mercapto-acetic acid, glyconic acid have good selectivity for separation of hematite and aegirine pka values of organic acids fall down because of the-I inductive effect of-OH or-SH, and lie at the pH range between two minerals point-zero-charge. As a result, the depression ability of them was enhanced, and a cyclo-pentyl chelate was formed when this organic acids acted with Fe〓 on the minerals surface.

发现在α位具有-OH、-SH等取代基的短链一元羧酸（乳酸、羟基乙酸、巯基乙酸，葡萄糖酸）对赤铁矿与钠辉石的浮选分离具有优良的选择性抑制作用，-OH、-SH的-I诱导效应导致有机酸的pKa值下降并落在两种矿物零电点之间，使其抑制性能增强，并与矿物表面的Fe〓形成稳定的五元螯合环。

The results showed the different fluorescence property with naphthalene due to the interaction, congruence of the molecules and formation of inter- or intramolecular exciplex.;A series of dithioesters with different aromatic rings such as naphthally, anthracyl and pyrene in R groups were synthesized. The polymerizations of MMA using these dithioesters as the RAFT agents were investigated.

结果表明：在NMNDT和它获得的聚合物溶液中，由于分子间的相互作用、叠合，激发态分子与基态分子形成了激基缔合物，引起了萘环荧光的淬灭，使其发光特性与原来萘的发光特性不同；探索了二硫代酯中R基团的立体和电子等性能对MMA的RAFT聚合的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。