长心卡帕藻愈伤组织的诱导与其形态建成的初步研究

以PES液体培养基、固体培养基,采用正交设计,开展了长心卡帕藻(Kappaphycus alvarezii)棕色藻株组织培养和愈伤组织诱导实验,探索了蔗糖、光强、植物生长调节剂对新芽形成和愈伤组织形成的影响,结果表明,固体培养基、IBA、6-BA处理可诱导该藻产生愈伤组织,同时固体培养基更利于诱导形成愈伤组织;显微跟踪观察显示,该藻愈伤组织与高等植物的疏松愈伤组织不同,由细丝状细胞组成,系藻枝段中心髓部细胞脱分化形成的致密型愈伤组织;另外,愈伤枝段比新芽枝段有更高的光合和呼吸速率。     

地球外部扰动重力严密改化模型及分析检验

直接积分模型是计算地球外部扰动重力的主要数学工具,将全球积分模型改化为局域积分模型是实现地球外部重力场赋值的前提条件.相比表层积分模型和向上延拓积分模型,Stokes积分模型要求的输入信息种类最少,故在减轻数据保障压力方面具有比较明显的优势.在实施Stokes积分模型工程化应用过程中,我们发现扰动重力径向分量积分模型从...     

产业有序转移与区域产业协调发展——基于广东产业有序转移的经验

阐明了产业有序转移、区域产业协调发展的内涵,构建了产业有序转移对区域产业协调发展作用机制的分析框架。根据这个分析框架,从理论和广东产业转移经验两个方面进一步揭示了产业有序转移促进区域产业协调发展的机制。结果表明,产业有序转移是在政府有效干预下所形成的有利于区域产业协调发展的一种产业转移形式。产业有序转移通过诱致或促进区域产业结构优化调整、区际产业合理分工、区际产业关联互动,以及提高区域产业发展总体效率等路径,促进区域产业协调发展。     

Distinction Between Oil Expulsion History and Gas Expulsion History

The process of organic matter transformation into oil and gas is also a balance process of hydrocarbon transformation. This article probes to distinguish the oil expulsion history from gas expulsion history based on the hydrocarbon generation, hydrocarbon residual, and hydrocarbon expulsion processes of the source rocks. In this method, the first step is to study the hydrocarbon expulsion rate by means of hydrocarbon generation potential method; the second step is to study the oil generation rate by means of the heating–pressuring experiment method; the third step is to study the oil residual rate by means of the mathematical method. The difference between the values of oil generation rate and oil residual rate is defined as the oil expulsion rate, while that between the values of hydrocarbon expulsion rate and the gas expulsion rate is defined as the gas expulsion rate. Then, combined with the geological parameters of source rocks, the oil and gas expulsion history can be obtained. This study on Es₁ Source rocks, Nanpu Sag, Bohai Bay Basin, China shows that the primary expulsion period of Es₁ source rocks is Guantao–Minghuazhen period.     

Lithium depletion in late-type dwarfs

Using a self-consistent dynamic theory of non-local convection, the atmospheric lithium-abundance depletion values of a series of stellar evolutionary models with     are calculated, and the results show that the general observed properties of lithium abundance in lower-main-sequence stars can be reproduced by overshooting mixing and gravitational settling. After a careful study of the mechanisms of lithium depletion in stars, it is concluded that overshooting mixing and microdiffusion induced by gravitational settling and radiative acceleration are the two primary depletion mechanisms: for warm stars with     (or     ) microdiffusion dominates, while it is the other way round for cooler objects with     (or     ).     

Calculating the Light Period of BL Lac Object S5 0716+714 by Wavelet Analysis Method

A kind of wavelet analysis method for identifying the light period of the BL Lac object S5 0716+714 is introduced. The rather complete observed data in the four optical wavebands B, V, R, I are collected, and the long-term light curves based on 10-day averaging are obtained. On these light curves, the periodicity analysis is performed by using a wavelet analysis method. The result demonstrates that the wavelet analysis method is preferable for searching and identifying the light periods of BL Lac objects. From the contour map of the real part of the wavelet transform coefficient, the periodical light variations of the BL Lac object S5 0716+714 can be precisely identified. By analyzing the wavelet variance curves at the 4 wavebands, it is found that the BL Lac Object S5 0716+174 has a stable light period of 1160 days. This result is consistent with the 3.3-year period given by Raiteri et al. It is predicted that the next outburst in this object will happen around the August of 2011.     

A Study of the γ-ray and X-ray Radiations of BL Lac Objects

The X-ray and γ-ray flux densities of 18 γ-loud BL Lac objects as well as their average spectral indices of X-ray wave band (1 keV) and γ-ray wave band (>100 MeV) are collected, and the correlations among the various quantities are examined. The results indicate: (1) The X-ray flux density and the γ-ray flux density exhibit rather strong correlations in all the states, high, low or mediate. (2) Between the mean spectral indices in X-ray and γ-ray wave bands there is a comparatively intense anti-correlation. (3) Between the average spectral indices and the X-ray and γ- flux densities there is no evident correlation either in the high or the mediate state. (4) Between the average spectral index of γ-ray wave band and the flux density of X-rays in low state there is a rather strong anticorrelation. Between the mean spectral index of X-ray wave band and the γ-flux density in low state there also exists a weak correlation. The results of our analysis support the viewpoint that both the X-ray and γ-ray emissions of BL Lac objects come from the synchrotron radiation and synchrotron self Compton (SSC) radiation with one and the same distribution of relativistic electrons.     

2008年2月24日大～暴雪天气过程分析

针对长治市2008年2月24日大～暴雪天气过程,从500hPa环流形势、700hPa影响系统、地面气压场、物理量场的相对湿度垂直空间分布、Fy-2c云图演变特征进行了综合分析,给出了该次大～暴雪的主要成因,为今后强降雪预报提供重要参考。