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rare earth material
相关语句
  稀土材料
     Application of antiseptic fixative from rare earth material
     一种稀土材料防腐固定剂在医学上的应用
短句来源
     The electroplating of NdFeB rare earth material in aqueous solution has the disadvantage of plating delaminating and blistering.
     在钕铁硼(NdFeB)稀土材料表面直接进行水溶液电镀时,存在镀层分层、易起泡等缺陷。
短句来源
     State Key Laboratory of Rare Earth Material Chemistry and Application
     稀土材料化学及应用国家重点实验室
短句来源
     Rare Earth Thermo-chemical Treatment and Rare Earth Material Surface Modification
     稀土化学热处理与稀土材料表面改性
短句来源
     The development of rare earth material is in close relation to the development of high-tech.
     稀土材料的开发与高技术的发展关系日趋密切。
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  “rare earth material”译为未确定词的双语例句
     Nd Fe Boron rare earth permanent magnetic material(8.0 mm in diameter and 1.2 mm in thickness) was applied in the center of the inoculated tumor onto the mice of both magnet group and magnet+CTX group with the magnetic intensity of 0.10-0.11 T. The same rare earth material was applied onto the same place in the mice of control group and CTX group without magnetism.
     单纯敷磁片组、单纯环磷酰胺组采用直径8.0mm,厚1.2mm的钕-铁-硼稀土永磁材料贴敷于接种瘤苗处中心,磁感强度0.10~0.11T。
短句来源
     Since rare earth anti-bacterial nano materials have the properties of both rare earth material and nano material, its antibacterial and air-clearing effect is greatly improved.
     稀土纳米材料集稀土特性和纳米特性于一体 ,大大提高了纳米材料的抗菌和空气净化效果 ,因此 ,稀土纳米材料及其应用已成为当前的一个热点 ,但其卫生安全性还未引起人们的足够重视。
短句来源
     The Permanent Magnet Synchronous Motor (PMSM), whose rotor is composed by a kind of rare earth material —— NdFeB, has appeared since early 1970’s.
     由稀土永磁体钕铁硼(NdFeB)构成转子的永磁同步电机(PMSM)是 20世纪 70 年代初期出现的一种新型同步电机。
短句来源
     PMSG is different with salient pole Synchronous generator and its poles are made of the rare earth material with high BH product, which avoids the excitation losses, makes the generator structure simpler with high efficiency.
     它不同于电励磁的凸极同步发电机,而是采用高磁能积的永磁材料作为磁极,就省去了励磁绕组产生的损耗,使得电机的结构变得简单,效率也随之提高。
短句来源
     A phtometric method is suggested to determine directly Nd and Er in mixed rare earths. It has been used to determine Nd and Er in two synthetic samples and a rare earth material, satisfactory results are obtained.
     拟定了三阶导数光谱直接测定混合稀土中Nd和Er的方法,用于合成样及稀土矿样分析,结果满意。
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  相似匹配句对
     RARE EARTH AND CLASSIFICATION
     稀土及分类
短句来源
     Thermistor of Rare Earth
     稀土热敏电阻
短句来源
     Rare Earth Superconducting Materials
     稀土超导材料
短句来源
     The Rare-earth Nanomaterials and Its Applications
     稀土纳米材料及应用(Ⅱ)
短句来源
     Prospects of Rare Earth Materials
     稀土材料的展望
短句来源
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  rare earth material
These magnets are pressed from neodymium-iron-boron rare earth material and magnetized in the radial direction.
      
Small amount of rare earth material in the steel melts have the role of scavenging, deoxidization and grain refinement and so on.
      
Apart from in the USA, much of the rare earth material produced is not processed in the country of origin.
      


The susceptibilities of the rare earth materials Dy2Ti2O7, GdPO4, Gd2(SO4)3, Gd2(S04)3·8H2O were measuratured from 1.6K to 4.2 K. The results showed that the meterials investigated obey the Curie or the Curic-Weiss laws in this temperature range. The Curie or N'eel temperature is below 1.6K. The Weiss constants are all found smaller. As far as the magnetism in weak field of the materials was concerned, they appear suitable as working substance for the magnetic refrigerator from 1.6 K to 4.2 K.

我们用互感法在1.6—4.2K的温区内对稀土化合物Dy_2Ti_2O_7、GdPO_4、Gd_2(SO_4)_3、Gd_2(SO)_3·SH_2O进行了磁化率测试.其中在对Dy_2Ti_2O_7的测量中,最低温度达到了~1.4K。根据测量结果分析表明:这四种材料的磁化率与温度的关系在该温区里都遵守居里定律或居里-外斯定律,它们的居里点或奈尔点都低于1.6K,外斯常数都比较小,就磁性而论,这四种材料都可以作为工作温度在1.6一4.2K温区里的磁制冷介质。

The purpose of this paper is to investigate infrared transtions of Er3+ and Tm3+ ions and energy transfer between them in LaOBr material. Jouart has studied energy transfer between Er3+ and Tm3+ ions in cadimium fluoride crystals[1] . But there are no publishes about energy transfer between Er3+ and Tm3+ ions in rare earth material in the infrared region so far. Here we present the results for energy transfer between Er3+ and Tm3+ ions in the LaOBr material for the first time. We find that there...

The purpose of this paper is to investigate infrared transtions of Er3+ and Tm3+ ions and energy transfer between them in LaOBr material. Jouart has studied energy transfer between Er3+ and Tm3+ ions in cadimium fluoride crystals[1] . But there are no publishes about energy transfer between Er3+ and Tm3+ ions in rare earth material in the infrared region so far. Here we present the results for energy transfer between Er3+ and Tm3+ ions in the LaOBr material for the first time. We find that there are a number of luminescence lines of Er3+ and Tm3+ ions jn the infrared region from 0.8μ to 2.0μ by the excitation of 5145A or 4880A of argon laser. They come seperately from four energy levels of Er3+ and Tm3+ ions. The intensities of fluorescence of Er3+ and Tm3+ ions strongly depend on the concentration of Er3+ and Tm3+ ions. Coresponding to emission lines from different energy levels of ions, the laws of concentration quenching are different. This kind of self-quenching phenomenon may be related with the interactions of multipolar cross relaxation of Er3+ and Tm3+ ions energy levels. Our results provide an information to look for the best doping-con-centration of infrared transitions of this kind of material.When both Er3+ and Tm3+ ions are present in the host LaOBr, the relative intensities of Er3+ and Tm3+ ions fluorescence are strongly influenced by the energy transfer between these two ions. One can see clearly from Fig. 6 that all the lines, except curve 5 , from the transitions of Er3+ levels decrease with the increase of Tm3+ ions concentration. At the same time, the intensities of fluorescence of Tm3+ ions increase in a great extent manner. This result indicates undoubtedly the energy transfer from Er3+ to Tm3+ centre. The lifetime of 4S3/2 level of Er3+ ions as a function of the concentration of Tm3+ ions has been also investigated. Fig.7 gives the result of lifetime measurement of 4S3/2 level of Er3+ ions. It shows that by introduction of Tm3+ ions, the lifetime of 4S3/2 level of Er3+ ions decreases with the increase of the concentration of Tm3+ ions. This result is in agreement with that obtained by Ying et al. in the visible region of transitions of LaOBr: Er3+, Tm3+.

对在基质LaOBr中分别加入Er~(3+)和Tm~(3+)稀土离子时的红外光谱强度随Er~(3+)和Tm~(3+)离子浓度的变化规律进行了研究。通过对在基质LaOBr中同时加入Er~(3+)和Tm~(3+)稀土离子对它们的发光强度随着浓度的变化呈现不同规律的研究,证实了发生于Er~(3+)和Tm~(3+)稀土离子之间的能量转移是影响Er~(3+)和Tm~(3+)红外发光的重要因素。并且,这种能量转移过程是以共振传递的方式进行的。另外,通过对Er~(3+)的~4S_(3/2)能级寿命的测量,给出这种能量转移的直接证据。

The fluorescence decay time of rare earth materials is a very important parameter which characterizes the transition probability between energy levels, the interaction between host lattics and dopant and the energy transfer dynamics in co-doped phosphors, etc. To date many investigations have dealt with the excitation and emission of these solid materials;however, the decay time data are scare and discrepancies exist among published values.The purpose of the present work was to establish an easily...

The fluorescence decay time of rare earth materials is a very important parameter which characterizes the transition probability between energy levels, the interaction between host lattics and dopant and the energy transfer dynamics in co-doped phosphors, etc. To date many investigations have dealt with the excitation and emission of these solid materials;however, the decay time data are scare and discrepancies exist among published values.The purpose of the present work was to establish an easily available technique for measuring decay times ranging from tens of nanosecond to several milliseconds and to study the energy transfer phenomenon in some luminescent Systems.According to the excitation and emission characteristics of the particular tare eaith ion studied, samples were excited either by the 337 nm radiation of a nitrogen laser or the 532 nm output of a Nd:YAG laser;and the signals were received either by a photomultiplier for the visible fluorescence or a germanium diode for the near infrared emission. Attention was payed to using weak excitation and eliminating random scattering to avoid the interference in measurements.Our photomultiplier was specially wired for high gain, clean transient response by mounting the tube dhectly on a printed circuit board and a low impedance termination of 50 was used. Thus we have obtained the decay time of 68ns for Ce3+ in Ce:YAG and 42ns in Ce, Nd:YAG, in excellent agreement with the values measured on a SP-70 nanosecond spectrofluorimeter based on time-correlated single-photon counting technique. Shortening of the decay time of Ce3+ in double-doping system compared to that in single doping one cleaily indicates the energy transfer from Ce3+ to Nd3+ in Ce, Nd:YAG.Eu2+-doped phosphors studied are of high luminescent efficiency in the blue -green region. The broadness of the emission band indicates the interaction between host and activator which can be attributed to the presence of an excited electron in an outer shell of the Eu2+ ion. The transitions correspond to 4f-5d. The oscillation strength of these transition are orders- of magnitude higher than those for the normally weak and shielded 4f-4f transitions of Eu3+, Since the radiative probability of 4f level is low (103s~1) compared to that of 5d level (106s-1). The decay time Eu2+-doped (Sr, Ca)5(PO4)Cl:Eu2+, (Eu, Ba)Mg2 Al16O and SrAl2O4:Eu2+ is nearly 1 microsecond, and that of EuP6O14 is 4.3 milliseconds.Nd3+ doped in different tost lattices is one of the most powerful and widely used laser active materials. In the present study the decay times were measured for Nd:YAG, Nd, Ce:YAG, Nd, Cr:YAG and NdP6O14.We found that the 4F3/2 lifetime of Nd3+ in Ce and Cl co-doped Systems was not noticeably changed as compared to that in single doping system. Nd3+ has a shorter lifetime in NdP5O14 probably as a lesull of concentration quenching.

本文用激光激发和荧光探测技术测定了Eu~(2+)、Eu~(3+)、Ce~(3+)、Dy~(3+)、Nd~(3+)和Tb~(3+)离子在一些发光材料和激光晶体等固体中的荧光寿命,其寿命值从几十纳秒到几毫秒。为此对寿命测量技术进行了探讨以适应如此宽广的时间范围。从测得的寿命数据解释了材料内激活离子的性质和相互作用。

 
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