The Density of Bottom Sediment Particles in Water Bodies

Water Resources - The density of particles in the bottom deposits of water bodies is an important characteristic, which determines the rate of interaction between bottom water layers with the...     

冀东地区冰雹云多普勒雷达参数特征分析

利用2008—2015年冀东地区发生的36个冰雹个例,通过秦皇岛多普勒天气雷达资料反演出冰雹发生时雷达的各种参数,提取各种参数与冰雹发生时的关系。研究结果表明冰雹发生时,基于风暴的最大基本反射率因子、风暴顶高、垂直累积液态水含量平均值分别为62 dBz,9. 9 km,51. 6 kg·m~(-2),0℃层以上平均风暴厚度为5. 8 km,0℃层和-20℃层之间厚度平均值为3. 1 km,风暴最大基本反射率因子所在高度为4. 6 km,风暴平均移动速度为9 m·s~(-1)。不同尺寸的冰雹雷达参数变化不大。在冰雹发生过程中,两个体扫间风暴的最大基本反射率因子平均最大跃变为7 dBz,风暴顶高平均最大跃变为6. 7 km,垂直累积液态水含量平均最大跃变为17 kg·m~(-2),这种跃变的出现比冰雹发生时刻平均提前39、30和25 min,可以作为冰雹发生前的重要判断依据。此外还对WSR-88D冰雹算法进行了评估,结果表明,该算法的命中率较高,虚警率也较高,算法对冰雹的预报提前量平均为43 min左右,冰雹尺寸的预报结果偏大。     

A study of RATAN-600 observations of solar S-component sources

A sample of 36 S-component sources observed by the radio telescope RATAN-600 was compared with calculations of gyromagnetic emission and bremsstrahlung based on recent sunspot models. The diagnostic possibilities of the spectral distributions in the radio flux, the degree of polarization, and the source sizes for the estimation of magnetic scale heights and other source parameters were checked by different methods.Depending on the magnetic field structure, the observations show different types of polarization spectra. Most regular spectra and highest values of the degree of polarization were observed from sources above the leading part of the associated spot group. Magnetic scale heights were found to be intrinsically associated with the source size of the gyromagnetic emission.The flare production rate of active regions appears to be related to their S-component flux and magnetic scale heights.     

Scalar-tensor bimetric theory of gravitation. II. Energy-momentum tensor of the gravitational field

Institute of Applied Physics Problems, Armenian Academy of Sciences. Translated from Astrofizika, Vol. 33, No. 1, pp. 107–112, July–August, 1990.     

Spectral Observations of the Flare Star HU Del

Results are presented from a study of 27 spectra of the flare star HU Del obtained during 2000–2002 on the 2.6 meter telescope at the Byurakan Observatory. Two flares were detected, along with a weak correlation between the equivalent widths of the Hα and Hβ emission lines. At the time of the photometric maximum of a flare the equivalent widths of both these lines are minimal and reach their maximum only significantly afterward. A strong increase in the Hβ line intensity is observed which appears to be the consequence of a photometrically undetected, short-duration flare. A possible relationship between the binary (multiple) character and the physical activity of this star is examined briefly in terms of current theoretical models.__________Translated from Astrofizika, Vol. 48, No. 3, pp. 335–348 (August 2005).     

The state equation of superdense degenerate plasma

On the basis of general requirements, the parameters of the hadronic plasma and the state equation of degenerate superdense matter in the whole range of pressures are improved and corrected.