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Some sufficient conditions for g ∈ L2(?) to be a subspace WeylHeisenberg frame were given in a recent work [3] by Casazza and Christensen.


In a recent paper, the authors presented the key ideas involved in their approach to Feynman's operational calculi for systems of not necessarily commuting bounded linear operators acting on a Banach space.


In a recent taxonomic revision by Lane et al., [45], the number and status of the families traditionally included in the order have been revised.


In a recent study of dark mater Nbody simulations, a scaling relation between the SZ decrement and the Thomson depth of a cluster of galaxies of the form ΔTr∝τT2 has been found (Diaferio et al.


Microlensing of background stars by neutralino stars, which were proposed in a recent work by Gurevich and Zybin as the component making the main contribution to the dark matter, is studied.

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 The numerical theory of the threedimensional electromagnetic induction is a powerful tool in studying the seismomagnetic induction effect, as well as the lateral inhomogeneity of the electrical structure in the earth's crust and upper mantle. The complete numerical equations were established in our preceding paper[1]. In this paper we first show both theoretically and numerically the uniqueness, convergency and stability of the solution of these equations under definite conditions. Secondly, some model calculations... The numerical theory of the threedimensional electromagnetic induction is a powerful tool in studying the seismomagnetic induction effect, as well as the lateral inhomogeneity of the electrical structure in the earth's crust and upper mantle. The complete numerical equations were established in our preceding paper[1]. In this paper we first show both theoretically and numerically the uniqueness, convergency and stability of the solution of these equations under definite conditions. Secondly, some model calculations are carried out for various periods of source field and burying depths of local anomalous bodies to study the spacedistribution and frequency characteristics of the seismomagnetic induction effect. Under the assumptions that the dimension of the anomalous body corresponds approximately to the source dimension of an earthquake of magnitude 57, and that its conductivity is ten times as large as the normal value, the results for source period of a few seconds to a few minutes show that the largest anomaly, relative variation about 30%, of the horizontal component takes place in the central part above the anomalous body, and that the largest anomaly, relative variation 50%, of the vertical component takes place at the two sides perpendicular to the direction of the source field. Therefore, observing the anomalies of short period variations of the field might be a promising approach to monitoring conductivity variations associated with earthquake process. The anomalous intensity of the seismomagnetic effect, however, decreases quite rapidly with distance, so that the observing sites have to be near the earthquake source region; and this brings about the difficulty for their arrangement in advance.  本文是“地震的感应磁效应(一)——三维电磁感应的数值理论”一文的继续。首先从理论和实际计算两个方面证明了三维电磁感应数值方程解的唯一性、收敛性和稳定性,从而充实了作为研究地壳、上地幔电性结构横向不均匀性理论基础的“三维数值方法”。作为这一理论方法的实际应用,文中对不同源场周期和具有不同埋藏深度的三维电导率异常体进行了模拟计算,以研究地震感应磁效应的大小、空间分布特征和频率特性。模拟计算结果表明,对于周期从数秒到数分钟的地磁短周期变化,若电导率异常体的线度与5至7级地震的震源体积大体相当,其电导率较原背景电导率高近一个量级,其感应磁效应主要特征为:在异常体正上方,地面磁场的水平分量变化最大,相对变化量约30％;在异常体于源场方向一致的两侧,垂直分量变化最大,相对变化量约40—50％。因此,观测短周期地磁场的异常变化,有可能是监测地震孕育过程地下电性变化的一种试验途径。但由于上述异常强度在空间上衰减迅速,所以观测必须接近震源区,这对测点的选择是个不利的因素。  We all consider that the suitable temperature to storage green pepper should be79℃, and the storage temperature below 6℃. would result in cold injury of fruits. Through several years investigatson, the authors suggest that the pericd of storage green pepper under 79℃. condition is only permissive to last about one month, and a large amounts of fruits will be rotten, if storage were prolonged. Storage under low temperature(01℃)may effectively inhibit the respiratory retard the postripeness and reddening,... We all consider that the suitable temperature to storage green pepper should be79℃, and the storage temperature below 6℃. would result in cold injury of fruits. Through several years investigatson, the authors suggest that the pericd of storage green pepper under 79℃. condition is only permissive to last about one month, and a large amounts of fruits will be rotten, if storage were prolonged. Storage under low temperature(01℃)may effectively inhibit the respiratory retard the postripeness and reddening, reduce the loss of rotting and preserve the nutritive value of fruit. In addition, when green pepper were storaged under low temperature (01℃.), the amount of rotten fruit is less than under 79℃, a few cold iojury fruits were found and the period of storare may be prolonged to two months more or less. Green pepper provided for storage long period have to be fully developed and harvested before frost. As compared with the following different storage methods, such as: storage under 01℃., general method, air conditional storage, treated with storage paint and Co~(30)γ ray treatment, there are no significant differences between them.  据文献报导,青椒最适宜的贮藏温度为7—9℃,低于6℃易引起冷害。作者经过几年来的试验发现,在7—9℃条件下只能贮藏近一个月左右,如继续进行贮藏就会引起大量腐烂;而在接近0—1℃条件下可贮藏近两个月,而且可以有效抑制青椒果实的呼吸强度,对于延迟果实的后熟转红,减少腐烂,保存营养。均有明显效果,腐烂率大大低于6—7℃条件下贮藏的青椒。试验表明,作为长贮的青椒最好在霜前采收充分成熟的绿果,并用逐渐降温的方法,在0℃—1℃条件下进行贮藏,能获得较好的效果。  The exciton transition 4T1 →6A1 of Mn2+ ions in quasi onedimensional antiferromagnet CsMnCl3·2H20 is very weak in intensity with a shorter lifetime due to the vibrationqueching. Replacing H2O by D2O), three important effects have been observed: the exciton line is shifted to the red by 18cm1, the intensity of the exciton is increased by almost one order, the lifetime is lengthened from 0.58 ms to 9.2 ms. These facts show that the vibrationquenching has been weakened. The experimental results are analysed... The exciton transition 4T1 →6A1 of Mn2+ ions in quasi onedimensional antiferromagnet CsMnCl3·2H20 is very weak in intensity with a shorter lifetime due to the vibrationqueching. Replacing H2O by D2O), three important effects have been observed: the exciton line is shifted to the red by 18cm1, the intensity of the exciton is increased by almost one order, the lifetime is lengthened from 0.58 ms to 9.2 ms. These facts show that the vibrationquenching has been weakened. The experimental results are analysed by means of the theory of multiphonon radiative and nonradiative transitions. It has been shown that the isotope substitution changes the spectrum of lattice vibration, and brings forth a great influence on the nonradiative transition. The electronphonon coupling intensity does not show any obvious change, and the HuangRhys factor remains constant. The phonon modes involved in the multiphonon radiative transition are different from those involved in the multiphonon nonradiative process, their average energies are quite different from each other.  在一维反铁磁体CsMnCl_3·2H_2O中,用D_2O代替其中的结晶水之后,对于~4T_1→~6A_1激子跃迁,观察到三种明显的效应:激子线红移18cm~(1);激子讯号增强近一个数量级;激子寿命由0.58ms变为9.2ms,增加15倍。这后一种效应在文献中尚未见报道,它说明这种同位素替代使振动猝灭受到很大的减弱。利用多声子辐射和无辐射跃迁理论,讨论了实验结果。分析表明,同位素替代改变了晶格振动的频谱,对无辐射跃迁产生很大的影响。电声子耦合强度没有明显的变化,黄昆Rhys因子基本保持常数。卷入多声子辐射跃迁的声子模和卷入无辐射跃迁的声子模是不相同的,其能量有相当大的差别:前一种声子模与H_2O振动没有很大关系;而后一种声子模却与H_2O振动紧密相关。   << 更多相关文摘 
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