乌鲁木齐遥测地震台网   总被引：1，自引：0，他引：1  

吴新泉  何彦 《内陆地震》1995,9(2):163-170

对乌鲁木齐遥测地震台网的布局、观测项目的配置和技术系统的总体构成等方面进行了全面介绍，突出了系统的特点和先进之处。台网的建成对加强乌鲁木齐和北天山地区的监测预报工作起到了重要的作用，对国内遥测台网的设计建设和技术改进建设和技术改进起到了一定的促进作用。  相似文献   

乌鲁木齐超长站距无线传输遥测台网实施技术     

吴新泉  段天山 《内陆地震》1995,9(4):369-373

文中介绍了全无线化的乌鲁木齐遥测地震台网实现超长站距多道地震信息传输勘选设计和实施技术。其中包括网络组成、路由设计、系统参数设置、设备选型、高增益天线、高选择性低噪声放大、低损耗馈电等一系列技术问题。  相似文献   

Seismic torsional response and design procedures for a class of setback frame buildings     

X. N. Duan  A. M. Chandler 《地震工程与结构动力学》1995,24(5):761-777

This paper presents results of an analytical study of the inelastic earthquake torsional response of a class of setback frame buildings. In the first part of the study, the modal response spectrum analysis procedure is utilized to determine the yielding strengths of structural members in an idealized but representative setback frame building model. Results are then presented for the inelastic dynamic response of this setback building model subjected to an ensemble of six earthquake ground motions. The results indicate that the modal response spectrum analysis procedure is inadequate for preventing excessive response leading to concentration of damage in vulnerable structural members, such as those in the tower near the notch and those in the base (the part of the structure below the tower) near the perimeter at the opposite side of the tower. The second part of the study develops a modified equivalent static force procedure for strength design of such setback frame buildings. Response analyses show that the proposed procedure results in improved and satisfactory inelastic performance of the selected class of setback frame buildings, having a wide range of realistic configurations.  相似文献   

含氟初始风化水化学组成的模型研究     

刘春国  段长春  曹玉清 《吉林大学学报(地球科学版)》1995,(4)

在我国“三北”地区，浅层地下水中高氟苏打水分布广泛。本文利用和简化了Ｈｅｌｇｅｓｏｎ风化模型，以吉林省乾安地区为例，对含氟初始风化水化学组成作了研究和计算：探讨了二氧化碳滴定作用对风化过程的影响，从而定量确定了高氟水的成因模型。  相似文献   

非直角双曲线光合模型的积分及参数灵敏度分析          下载免费PDF全文

吴元中  段项锁 《应用气象学报》1993,4(4):504-508

非直角双曲线单叶光合模型对光合反应有更灵敏的响应。将它对叶面积积分，并用于大田干物质计算。其精度比用直角双曲线型的叶面积积分模式有所提高。对光合参数作了灵敏度试验，并指出育种和数值模拟试验中应注意的问题。  相似文献   

考虑吸收时确定震源深度的宏观地震方法     

段星北 《东北地震研究》1993,(2)

基于对在近场吸收系数A/km~2和源指标几何扩散率n都因实际地震而异的认识,导出了完整宏观地震震源深度公式,获得确定震源深度考虑吸收的宏观地震方法的通解。对此通解及宏观地震震源深度公式各提出三种算法以满足三种需要,经过三个实例,两公式六种算法对比计算结果都很好,并利用所得震源类型结合宏观场探索了震源几何学,为钻探地震直接观察震源的钻孔设计提供依据。  相似文献   

上海及其邻区楔形断裂系统北翼断裂构造岩显微构造及岩组动力学研究     

王允侠  高灯亮 《上海国土资源》1993,(4):46-51

本文通过对断裂构造岩显微构造特征的研究,进而对石英变形纹及光轴系统测量统计,进行岩组动力学分析,重建了断裂活动时的应力场特征及演化。并对断裂空间分布,断裂性质,运动方式、方向,生成环境及活动时期等作出推论。从而验证和进一步揭示了断裂的宏观构造特征。  相似文献   

Some characteristics of cumulus convection over the Tibetan Plateau     

Duan Tingyang  Elmar R. Reiter 《大气科学进展》1990,7(1):87-97

The diagnostic model of the cumulus convection proposed by Yanai et al. (1973) was applied to the atmosphere over the Tibetan Plateau, and used to estimate the vertical mass flux, entrainment and detrainment, excess temperature and moisture, liquid water content, and condensation and precipitation rates of highland cloud clusters. The re-sults illustrated that in clouds over the Tibetan Plateau, the water vapor condensation rate, liquid water content, and efficiency of the rain generation process are less than those in the tropics (represented by the Marshall Islands region). Therefore, the condensational latent heat released over the Tibetan Plateau, overall, is much smaller than that in the tropics. The water vapor and liquid water detrainment from shallow nonprecipitating cumulus clouds, and their entrainment into deep cumulus clouds, serve as a growing mechanism for the deep precipitating cumulus towers over the Tibetan Plateau. It should be noted that there is a stronger detrainment of liquid water from cumulus clouds and a stronger re-evaporation rate in environment. The process of the condensation-detrainment-re-evaporation-entrainment is repeatedly in progress. It would play an important role in maintaining of cumulus convection on the condition that the supply of moisture is not plentiful over the Tibetan Plateau.The analyses also showed that the cloud mass flux Mc over the Tibetan Plateau is less, and the large-scale av-erage upward motion is much less than those over the Marshall Islands. Stronger compensating downward motion in the cloud environment over the Tibetan Plateau, responsible for the area’s strong environmental heating rate was re-vealed, and would link to the stability of the South Asian High in summer.  相似文献   

我国中新生代陆相盆地构造-砂体复合油气藏类型划分与分布特征          下载免费PDF全文

段俊琥 《沉积与特提斯地质》1990,10(4):26-34

为了促使油气普查勘探的深入发展,注入新的活力,作者从我国中新生代陆相盆地基本特征,以及油气普查勘探的实践出发,提出构造-砂体复合油气藏的新类型,以期达到抛砖引玉的作用,供同志们讨论。一、构造-砂体复合油气藏类型的提出和含义油气藏的分类是个十分复杂的问题,包括的范围比较广泛,这里所讨论的中新生代陆  相似文献   

A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi,Northern Hunan     

Duan Taizhong  Guo Jianhua  Gao Zhenzhong  Li Zenghua  Zeng Yunfu 《《地质学报》英文版》1990,64(4):393-407

Carbonate contourite drift at Jiuxi. Taoyuan, northern Hunan, was developed in a deepwater area ofnorthern Hunan on the margin of the Early Ordovician South China palcocontinent. The Lower Ordoviciansequence in the area is more than 350 m thick and contains well-developed contourites that can be groupedinto the following five types: the calcilutitic, the arenitic, the siltitic. the fine ruditic and the bioclastic. Thefirst three often constitute a complete or incomplete contourite succession. The arenitic contourite is nearlyuniformly distributed as interlayers throughout the succession, creating a monotonously rhythmic texture inthe contourite drift. The pattern of spatial distribution of the succession shows that the contourite drift is ahuge ridge-like sedimentary body extending along the trend of paleoslope. Numerous marks of flow direc-tion have pointed to an eastward paleoflow direction along the slope.  相似文献