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Triton decay is found to be dominant for the 11B(s-hole) state and also found to be larger than α decay for the 15N(s-hole) state despite its smaller Q value compared to α decay.
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The results of analysis lead to a conclusion that, by exciting a fixed mode characterized by the maximum Q value, it is possible to obtain an MSL-based phase shifter possessing the optimum F at a minimum necessary level of the control voltage.
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As the hydrogenation time is increased, the Q value decreases at a rate that depends on the structural state of the steel.
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The change in Q is reversible: the removal of hydrogen from the material restores the Q value on a level close to that in the initial state (characteristic of a nonhydrogenated metal).
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The results of calculations of the Q value and the group velocity of the accelerating TM01 mode of the proposed tunable rectangular structure are presented.
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The inhibiting factors related to the reaction background depend on its multistep components (small spectroscopic factor), Q-value and transferred angular momentum.
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A power law is found for the q-value of the maximum.
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Characteristics of coda Q-value in the midnorthern part of Ningxia
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Analysis of digital seismograms recorded by the Yinchuan Telemetric Seismic Network, Ningxia, shows that not only the coda wave Q-value of shocks is strongly dependent on frequency but also its dependence on sampling depth cannot be neglected.
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The ground state (d,p)Q-value was found to beQo=5706± 5 keV.
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Cones of highest weight vectors, weight polytopes, and Lusztig's q-analog
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LetZ=G/Q be a complex flag manifold andG0 a real form ofG.
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We consider 3-parametric polynomialsPμ*(x; q, t, s) which replace theAn-series interpolation Macdonald polynomialsPμ*(x; q, t) for theBCn-type root system.
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Ass → ∞ the polynomialsPμ*(x; q, t, s) becomePμ*(x; q, t).
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Lichtenstein in the caseu =(n, ?) or(n?), we prove that ?(q).ζ1/2 is non zero for all harmonic polynomialsq ∈S() \ {0}.
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The mode assignment permits calculation of the spectral dependence of cavity Q values associated with observed peaks.
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The Q values for all fundamental modes and their contributions to MSL losses are determined.
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It is established that various fundamental modes in multicoupled MSLs are characterized by significantly different Q values.
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Frequency selective metal devices will have Q values on the order of only 10~100, and significant improvements of scattering rates or lowering of the imaginary part of ? have to be achieved to implement narrowband devices.
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The addition of B2O3 decreases the sintering temperature and results in rapid densification without obvious negative effect on the Q values of the system (Q=1/tan δ).
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| | On the basis of studing the limitations of spectrum ratio method forcalculating the seismic quality factor Q,this article puts forward several new methods.These methods make use of the main frequancies computed from reflection signals whichare reflected by two interfaces of a layer and the slope of the spectrum,or compensate thesecond spectrum by different Q value.When the main frequencies are the same,or theresemblance coefficient of the spectrums is maximal,Q can be obtained.These methodsare better than s... | | 在研究用频谱比率法计算Q值局限性的基础上,提出了基于地震波频谱计算Q值的新方法。利用相邻两个反射信号频谱的主频及其斜率,或对第二个反射信号的频谱进行Q扫描补偿,使该频谱与第一个反射信号频谱间的相似系数最大或两者主频相同的方法计算Q值。这些方法克服了频谱比率法的不稳定性。 | | 文摘来源 | | Earthquakes as a large-scale fracture in the earth's crust are known to be a fractal form, which is characterized by a fractal dimension. From a multifractal viewpoint, we analyzed the spatial-temporal distribution of micro-earthquakes in several seismic zones as well as prior to some large earthquakes (M≥7) in China. Generalized dimension, Dq. of the spatial distribution was calculated by using fixed-mass method, singularity spectrum f(α)- αwas also obtained. Our preliminary results show that the spatial d... | | 地震作为地壳内的大尺度破裂被认为是分形的,具有分数维的特征。根据多重分形的观点,本文研究了部分曾发生过中强以上地震的地区小震时空分布特征,应用固定质量法计算了地震时空分布的广义分维D_q,并得到了分形奇异谱f(α)-α_o初步分析结果表明:地震空间分布具有非均匀的分形结构,D_∞的分维值比D_0和负q的D_q值稳定。D_∞的时间变化实例表明:D_∞在大震发生前降低。这意味着地壳应力场非均匀程度的变化,进而简略地讨论了地震预测。 | | 文摘来源 | | According to Aki's coda theory, utilising more than 3000 seismograms recorded in 7 stations within the period of 12 years before and after Lancang-Gengma M=7.6 and M=7.2 earthquakes, variations of Q value of coda wave with time have been calculated which demonstrate: There existed 3-5 year low Q anomalies before Lancang-Gengma earthquakes;Q value was increasing a year before the earthquakes; Q values in most of the stations were obviously increasing after the earthquakes. From Q values observed in different... | | 本文根据Aki的尾波散射理论,利用澜沧—耿马7.6、7.2级大震前后近12年的时间,对大震区域及外围的7个地震台3000多张地震记录图的尾波进行了测量,计算出尾波Q值随时间的变化。结果表明:澜沧、耿马大震前有3~5年左右的低Q值异常;在大震前一年左右,Q值处于回升阶段;大震后多数台Q值明显增大。在对两次大震震中和两次强震震中的不同距离的台站测出的Q值,确实存在主震前低Q值或高Q值,主震后高Q值或低Q值的两种相互矛盾的现象。并得出地震强度与Q值异常幅度无关,与Q值异常的持续时间成正比。 | | 文摘来源 | |   | | << 更多相关文摘 |
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