spectra ['spektrə]

spectra的基本解释

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[变形] spectrum的复数形式

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系列, 范围, 谱, 光谱, 波谱, 射频频谱, 无线电信号频谱, 余象

spectra的同义词

n. spectrum

与spectra相关的网络例句 [注：此内容来源于网络，仅供参考]

To conduct such research a new experimental apparatus was established.With this setup the two-photon excitation spectra of Barium and one-photonexcitation spectra of Strontium Rydberg atoms were recorded and identified.The Stark spectra of Strontium atoms showed the "l-mixing" and "n-mixing"features. By changing laser wavelength and external electric field strengthsimultaneously, the scaled-energy spectra of Strontium 〓 Rydberg atomsat constant scaled-energy ε=-3.00,-2.50 and -1.88 were recorded for thefirst time. The experimental spectra were Fourier transformed and yielded therecurrence spectra.

主要工作包括：建立了一套用于外电场原子光谱研究的原子束实验装置；获得了Ba原子的双光子、Sr原子的单光子零场激发谱，并对各谱线进行了标识；进行了Sr原子电场Stark效应研究，观察到了低场时能级角量子数"l"混合区及高场时主量子数"n"混合区的存在；首次获得了Sr原子在标度能量ε=-3.00、-2.50及-1.88时〓高Rydberg态电场标度能谱及傅立叶变换后的电子回归谱。

Therefore,a series studies of ice-pier vibration are performed from different aspects in this paper.The main work of this his thesis is summarized as follows:(1) Ice response spectra is proposed based on the idea of a seismic response spectra analysis of str .. uctures.Firstly,ice response spectra on the basis of power spectra density function is established;Secondly,based on the assumption of quadratic parabolic interpolation method,the nonlinear interpolation analysis method of ice response spectra is studied from both theoretical and practical points of view,and the successive computation formulas including ice displacement,velocity and acceleration response spectrum are deduced by Duhamel integral.Furthermore,to analyze the effectivity and applicability of the method, the real temporal curves of ice pressure are used to be studied.The results show that the presented method is more convenient and accurate to study the structural response induced by ice force,also it can be effectively applied in the design of ice resistance.

鉴于此，本文针对冰激桥墩结构振动问题从不同方面展开了一系列与之相关的研究，主要研究内容如下：(1)根据结构抗震反应分析思想提出了冰振反应谱，首先建立了基于功率谱密度函数的冰振反应谱；其次借鉴地震反应谱内插法的思想从理论和实际观点出发，假定在等距离微小时间间隔内冰荷载按二次抛物线规律变化，由Duhamel积分推导出冰振位移、速度以及加速度反应谱的一系列连锁公式，建立了基于非线性内插法的冰振反应谱，并利用实际冰压力时程曲线进行了冰振反应谱数值分析，为以后冰激结构振动的研究提供一种方便、简捷、精确的分析方法，也能够将其有效地应用到结构的抗冰计算中。

Cephalotaxine ester of 2-oxo-6-methylheptanoic acid was treated with lithium diisopropylamide and Me O-(1-methoxyisopropyl)glycolate to give a mixture of homoisoharringtonine and its stereoisomers with 56% yield. The four stereoisomers separated by TLC showed identical mass spectra and almost superimposed IR but with different 1H NMR spectra. The configuration of the 2'-C and 3'-C of the four isomers were postulated based upon their 1H NMR spectra as compared with the 1H NMR spectra of isoharringtonine and its stereoisomers.

2-氧代-6-甲基庚酰基三尖杉碱(3)与0-(1-甲氧基异丙基)羟基乙酸甲酯(4)在强碱性试剂二异丙胺锂存在下，起亲核加成反应，反应中间体5在室温用酸性丙酮水解，得到一种新的三尖杉酯类生物碱一一高异三尖杉酯碱(6c)及其立体异构体(6a、6b、6d)的混合物，产率56%、通过制备薄层层析分得这四个立体异构体，它们的1H NMR和异三尖杉酯碱及其立体异构体的1H NMR类似，推定了它们的绝对构型。

与spectra相关的网络解释 [注：此内容来源于网络，仅供参考]

Spectra：频谱

"阵风"战斗机装备了性能全面和先进的"频谱"(Spectra)电子战系统,由泰利斯公司生产. "频谱"电子战系统整合固态发射机技术、雷达告警器、DAL激光告警接收机、导弹告警器、探测系统和干扰机. "阵风"战斗机装备一套由泰利斯公司发展电子扫描RBE2雷达,

Spectra：光谱

最近,该公司投资2000万美元,扩大了"光谱"(Spectra)纤维的生产规模,这种纤维是"光谱屏蔽"装甲材料的重要原材料,被DHB装甲集团公司用于制造防弹背心及插入防弹背心内的轻型武器防护插板.

Spectra：谱

公司是世界著名企业PENTAX(日本宾得)和Zeiss(德国蔡司)测绘仪器中国总代理,美国天宝Trimble光谱(Spectra)系列GPS在中国的总代理. 我公司在代理国外产品的基础上,自己独立设厂生产GPS、电子经纬仪及开发测绘方面的各种软件,

Spectra：范围, 光谱

eyelet 眼孔, 孔眼, 小孔, 针眼, 金属圈 | spectra 范围, 光谱 | uniform clearing unit price 统一清算单价

mass spectra：质谱

這項技術,他們已經製作出原型,將很快使複雜混合物的質譜(mass spectra)能被建立,一個分子接著一個分子. 如 Roukes 所指,"生命科學的次世代儀器 -- 尤其是系統生物學,那能使我們對生物系統進行逆向工程 -- 須以非常高的輸出才能使蛋白質體的(proteomic)分析成為可能.