the urgency for the study of the abnormal refraction

negative refractive index medium has many special properties, such as abnormal refractive phenomena, self-compression effects, anti-doppler frequency move and abnormal cerenkov radiation. these properties provide new ways to control light and a good vision of application for people.

负折射介质具有许多独特的物理性质，即反常折射现象、自聚焦效应、逆Doppler频移和反常Cerenkov辐射等，这些性质为人们提供了控制光的全新手段，具有良好的应用前景。

互联网摘选

the results show that the annual variations in time and latitude determinations in china can be partially explained with the anomalous refraction.

结果表明用反常折射可以部分地解释我国天文观测残差的周年变化。

互联网摘选

the annual variation of optical astronomical observational residuals caused by the anomalous refraction

反常折射引起的地面天文观测残差的周年变化

互联网摘选

some new concepts such as relative force, relative acceleration, relative reference frame, absolute force, absolute acceleration, and absolute reference frame was put forward.

提出了相对力、相对加速度、相对参照系和绝对力、绝对加速度、绝对参照系的新概念。

互联网摘选

in this paper the principle of measuring dynamic cracks on concrete structures by absolute acceleration transmitter has been discussed. the specific procedures of measuring and analysis of cracks on concrete structures have been explained, combining a practical engineering application of this method to a concrete dynamic foundation.

阐述了用绝对式加速度传感器测量混凝土结构动裂缝的原理，结合某混凝土动力基础动裂缝测量实例，介绍了混凝土结构动裂缝的具体测量、分析过程。

互联网摘选

the corrected accelerograms can accurately represent the absolute ground acceleration within the frequency band of 0.09 cps and 25 cps of the instrument.

修正后的加速度图，精确地表示了仪器基本频带在0.09HZ和25HZ之间的绝对地面加速度。

互联网摘选

results show that if change the number of sliding isolation bearings, the isolation effect will change. after setting more sliding isolation bearings, the period becomes longer, the interlayer displacement, absolute acceleration and shear force are all amplified.

结果表明，改变滑移隔震支座的数量，隔震效果明显不同，滑移隔震支座设置越多，结构的周期越长，层间位移幅值、绝对加速度和层间剪力的反应也随着增大。

互联网摘选

and the dynamic characteristics are also simulated. the results of simulation show that the active suspension can reduce the vehicle body ′ s bounce and pitch absolute acceleration transmissibility effectively, so it can achieve a good ride comfort.

仿真结果表明，主动悬架能有效地降低车身跳振和纵摆绝对加速度传递率，对提高汽车的乘座舒适性具有很好的效果。

互联网摘选

the fast algorithm for computing absolute acceleration, relative velocity and relative displacement response spectra at same time is suggested by comparing the algorithms, and the corresponding computer program is listed in the end of this paper.

文末通过计算对比研究，给出了同时计算绝对加速度、相对速度和相对位移反应谱的快速方法及相应的计算程序。

互联网摘选

secondly, after the mechanical model and the dynamic differential equation of the isolation structure are set up, the formulas of the relative displacement and the absolute accelerative speed are deduced by the random vibration theory.

建立层间隔震结构的动力分析模型和振动方程；采用随机振动分析方法，推导了层间隔震结构在简谐荷载作用下，上、下部结构的层间位移和绝对加速度反应的均方值解析表达式；

互联网摘选

by applying random vibration theory, the author studies double-layer vibration absorbing in detail; and derives functional expression of the absolute acceleration of mass points in two degree-of-freedom system and the root-mean-square value of relative displacement;

利用随机振动理论对双层减振问题进行探讨，推导出双自由度系统质点绝对加速度及相对位移均方值的函数表达式。

互联网摘选

absolute acceleration of structure above the second isolation layer of double-layer isolation is smaller than that of single-layer isolation ( decreasing to 10%~ 43%). 4.

采用双层层间隔震方案时，第二隔震层以上结构的绝对加速度反应要小于单层隔震层时相应楼层的绝对加速度反应（约降低了10%~43%）。

互联网摘选

the results experimentally demonstrated that the control system is effective for the five story model structure with all the control strategies.

试验结果表明：两种磁流变阻尼系统的被动控制与半主动控制均可以有效减小地震作用下模型结构的位移反应和绝对加速度反应；

互联网摘选

active control with absolute acceleration feedback

绝对加速度反馈主动控制

互联网摘选

the earthquake response characteristic of superstructure built on different deep soft sites is discussed for different input ground motions. some rules of ssi effect to the absolute acceleration peak value and relative displacement of high-rise building floors are drawn out.

讨论了在不同的深厚软弱地基条件下，输入地震动特性不同时桩箱基础高层建筑地震反应的特性，指出了SSI效应对上部结构楼层绝对加速度反应和楼层相对位移反应的影响规律。

互联网摘选

the numerical analysis indicates that it is preferable to employ the complete-feedback mode based on absolute acceleration of structures in designing atmd control.

数值分析表明，在设计ATMD时应选用基于结构绝对加速度的完整反馈模式。

互联网摘选

the common advantage of methods based on fission track or radioactive isotopes is to directly estimate the absolute ages of strata, but rigorous limits on sample type and conservation degree are required at the same time.

裂变径迹法与放射性同位素法的优点能对地层绝对年龄进行直接估测，但对样品类型及保存程度要求较苛刻。

互联网摘选

fiue-resolution planktonic zones of oceanic deposits have been established, modified, and correlated to the magnetostratigraphy with individual zones defined as fine as 100 000 years or shorter.

大洋钻探促并完善了大洋沉积的高分辨率的浮游生物带的建立，并确定了各个带的绝对年龄，最精细达10万年或更短；

互联网摘选

the geologic dating methods, which include the paleontology method, archeomagnetism method, and isotopic method, present absolute ages or relative ages of geologic events.

前人已建立的地质定年方法（同位素法、古生物法和古地磁法）给出的是地质事件的绝对年龄或相对年代。

互联网摘选

through the research, several important results have been obtained, which yield a new method to determine absolute ages. 1.

通过上述研究，作者提供了确定绝对年龄的新方法，并取得了一些重要成果和认识。

互联网摘选