浅谈数字化时代的电视产业

本文闸述了数字化时代,对服务于电视的高清晰度设备数字化摄像机的功能作了简单介绍以及后期非线性编辑给从业人员带来的要求。     

地幔对流及其对地壳表层拉张盆地的影响

回顾近十年来在地幔对流方面的最新研究进展,阐述了板块俯冲后在地幔中的演化特征,以及地幔上升流即地幔柱的驱动机制和地质效应。特别介绍了地幔柱对地壳表层拉张盆地形成和充填过程的影响。进一步探讨了地幔柱活动在济阳坳陷的地质表现及其引发的火山岩浆活动、碎屑充填特征。认为盆地演化的阶段性间接反映了地幔对流的阶段性。     

Gamma-ray bursts: post-burst evolution of fireballs

The post-burst evolution of fireballs that produce γ-ray bursts (GRBs) is studied, assuming the expansion of fireballs to be adiabatic and relativistic. Numerical results as well as an approximate analytic solution for the evolution are presented. Owing to the adoption of a new relation between t R and γ, our results differ markedly from previous studies. Synchrotron radiation from the shocked interstellar medium is carefully calculated, using a conventional set of equations. The observed X-ray flux of GRB afterglows can be reproduced easily. Although the optical afterglows seem much more complicated, our results can still present a rather satisfactory agreement with observations. We also find that the expansion will no longer be highly relativistic about 4 d after the main GRB. We thus suggest that the marginally relativistic phase of the expansion should be investigated so as to check the afterglows observed a week or more later.     

西海固地区构造应力场特征及其与地震活动性的关系

我们根据该区11个M_s≥3.5级地震的震源机制资料,求得该区主压应力轴的平均方向为北东75°,平均仰角为17°。结合地形变资料和深部构造特征,讨论了该区构造应力场特征及其与地震活动性的关系。     

我国石油地球物理勘探的回顾与展望

本文简述了中华人民共和国成立三十年以来石油地球物理勘探工作的发展过程。分阶段地介绍了在中国西部、东北和华北等地区工作时的技术成就和地质效果。也概要地介绍了作者对今后石油物探技术发展方向的看法。     

皖南祁门-歙县地区元古界变质岩地层原始构造环境和形变

1975年和1976年,作者和安徽省地质局332队宿立先、黄清涛同志先后观测了皖南的铺岭组和井潭组剖面,并将部分资料作过初步介绍。1977年作者又到现场观测和收集了牛屋组、板桥组、漳前组的有关资料。本文就是根据已收集的初步资料整理而成。研究地区元古界变质杂岩包括休宁组以前的地层。安徽省区域地质调查队将它分为漳前、板桥、木坑(环沙)、牛屋、邓家和井潭(铺岭)六个组分别归于震旦系和前震旦系(表1)。     

三分量磁饱和式磁力仪

本文概述了为青藏科考大地电磁测深工作研制的三分量磁饱和式磁力仪的原理、性能、用途和野外使用情况。 仪器的技术指标为:分辨率0.2伽（亻马）;灵敏度100毫伏/伽（亻马）;温度系数l伽（亻马）/℃;记录频带0-1.0赫兹;耗电量18瓦。 在青藏高原的地球物理考察中,用本仪器先后在藏南、藏北五个点进行了连续数月的野外地磁测量。从工作情况看,仪器工作正常,记录了一次完整的磁暴,为研究青藏高原地壳与上地幔的电性结构提供了一批有意义的资料。     

全隐伏变质岩系构造分析的几个问题

对于完全无露头的低-中级变质并多期变形的变质杂岩,由于变形复杂及地表全无露头,因而在进行构造分析时将会遇到许多困难。例如安徽霍丘群含铁岩系自进行普查勘探以来,迄今未作出肯定的构造解释。困难之处在于:(1)难于确定钻孔中各岩性层的产状及其变化;(2)难于找出连续、稳定的简单标志层。例如该群的不同组中都有类似的岩性层(碳酸岩、片岩、片麻岩)。     

Topographically forced three-wave quasi-esonant and non-resonant interactions among barotropic rossby waves on an infinnite beta-plane

In this paper, we first apply the assumption h = εh′ of topographic variation (h is the nondimensional topographic height and is a small parameter) to obtain nonlinear equations describing three-wave quasi-resonant and non-resonant interactions among Rossby waves for zonal wavenumbers 1—3 over a wavenumber-two bottom topography (WTBT). Some numerical calculations are made with the fourt-order Rung-Kutta Scheme. It is found that for the case without topographic forcing, the period of three-wave quasi-resonance (TWQR) is found to be independent of the zonal basic westerly wind, but dependent on the meridional wavenumber and the initial amplitudes. For the fixed initial data, when the frequency mismatch is smaller and the meridional wavelength is moderate, its period will belong to the 30–60-day period band. However, when the wavenumber-two topography is included, the periods of the forced quasi-resonant Rossby waves are also found to be strongly dependent on the setting of the zonal basic westerly wind. Under the same conditions, only when the zonal basic westerly wind reaches a moderate extent, intraseasonal oscillations in the 30–60-day period band can be found for zonal wavenumbers 1–3. On the other hand, if three Rossby waves considered have the same meridional wavenumber, three-wave non-resonant interaction over a WTBT can occur in this case. When the WTBT vanishes, the amplitudes of these Rossby waves are conserved. But in the presence of a WTBT, the three Rossby waves oscillate with the identical period. The period, over a moderate range of the zonal basic westerly wind, is in the intraseasonal, 30–60-Day range.     

涡度规则分布与非规则分布的转换

用一个β平面准地转正压模式积分１２个模式日,研究涡旋相互作用问题。初始场上有一个台风涡旋和一对涡旋偶极子,它们的等值线均为光滑、规则的分布。规则分布的涡旋之间的相互作用,可以激发出一个非规则的貌似混乱的涡度分布区域。随着时间的演化,在这个非规则分布的区域,一个相对有序的反气旋环流又逐渐显示出来。