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site
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  场地
    RELATIONSHIP OF THE SITE INDEX WITH THE SEISMIC SHOCK PARAMETERS
    场地指数与地震动参数的关系
短句来源
    TTO STRENGTHEN THE LEGAL MANAGEMENT FOR SEISMIC SAFETY EVALUATION OF ENGINEERING SITE
    论加强工程场地地震安全性评价工作的法制管理
短句来源
    DYNAMIC CHARACTER, ZONATION AND EVALUATION ON ENGINEERING SITE IN QINGLONG COUNTY, QINHUANGDAO CITY
    秦皇岛市青龙县城工程场地动力特征及分区评价
短句来源
    ADJUSTMENT OF SITE FACTORS IN THE SEISMIC HAZARD OBSERVATION
    震害预测中的场地因素调整
短句来源
    comprehensive Evaluation of Monitoring Fautt Ability of the Measuring Site along the xianshuihe Fault
    鲜水河断裂各流动形变测量场地监测能力的综合评价
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  场址
    Proof of Site Typicality of Bayangaole Evaporation Experimental Station
    巴彦高勒蒸发实验站场址代表性论证
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    Seismic Zoning Based On Site Earthquake Response Intensity ──Taking Shanxi and Sichuan for Example
    利用场址的地震影响烈度资料的烈度区划方法──以山西、四川为例
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    The Application of Comprehensive Geophysical Exploration in Site Evaluation for Radioactive Wastes Treatment
    综合地球物理方法在放射性废物处置库场址特性评价中的应用
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    DISCUSSION OF INFLUENTIAL FACTORS FOR BASIC SEISMIC INTENSITY OF THE TELEVISION SIGNALS LAUNCHING TOWER SITE IN SUIHUA CITY
    绥化电视发射塔工程场址地震基本烈度影响因素的探讨
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    Seismic environment around the site of Mobile Communication Center in Shandong Province and determination to its ground motion Parameters
    山东移动通讯枢纽工程场址的地震环境与地震动参数确定
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    On Determination of SL_2 and SL_1 for the Wentuozi Site of the Liaoning Nuclear Power Plant
    辽宁核电站温坨子厂址设计墓准地面运动SL_2和SL_1的确定
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    Monitoring and evaluation for observation environment in thenew candidate site of Qianzhou Geomagnetic Observatory
    泉州地磁台新址观测环境的监测与评估
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    LANCANG-GENGMA EARTHQUAKE IN 1988 AND GRAVITATIONAL VARIATION IN WESTERN YUNNAN SEISMOLOGICAL EXPERIMENT SITE(WYSES)
    1988年澜沧─耿马地震与滇西实验场的重力变化
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    Method of expected earthquake losses estimation based on the frequency of seismic site intensity
    Method of expected earthquake losses estimation based on the frequency of seismic site intensity
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    PREDICTION OF SEISMIC RESPONSE TO SITE EFFECT OF SURFACE GEOLOGY
    表面地质的地震响应预测
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  site
Therefore, van der Waals' interactions between acetylcholinesterase and these drugs are stronger than those between butyrylcholinesterase probably due to a small active site gorge and a significant peripheral anionic site for acetylcholinesterase.
      
Novel 5-substituted esters and homologous ester and amido derivatives of 4,5 dihydro-3,3-diethyl-2(3H)-furanone were synthesized and evaluated for anticonvulsant activity in rodents and for affinity to a site on the GABAA receptor complex ([3H]TBOB).
      
The results showed that these compounds are capable of important interactions with the NNRT binding site, which encouraged us to submit them for biological assay.
      
From these data, it may be deduced that the administration of high concentration of 18-methyl norethindrone can displace ketoprofen from its secondary binding site.
      
This work attempts to calculate the binding-site number using fluorescence spectroscopic method with bovine serum albumin (BSA) and Indo-1 as protein and ligand models, respectively.
      
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After the construction of reservior in an alluvial stream, the equilibrium condition of the downstream channel will be upsetted due to the reduction of sediment supply. This will result in a change in the form and gradient of the channel. The direction of the displacement will lead to a reduction of the sediment carrying capacity of the channel, through which the river regains its equilibrium. The whole process is accomplished by the flattening of the bed slope, as suggested by the theories generally accepted...

After the construction of reservior in an alluvial stream, the equilibrium condition of the downstream channel will be upsetted due to the reduction of sediment supply. This will result in a change in the form and gradient of the channel. The direction of the displacement will lead to a reduction of the sediment carrying capacity of the channel, through which the river regains its equilibrium. The whole process is accomplished by the flattening of the bed slope, as suggested by the theories generally accepted at the present. From a study of the fluvial processes of Colorado River and some other streams, it appears that a decrease in channel gradient is one of the three possibilities only, and should not be regraded as an universal rule. In fact, the change in bed slope below an impounding reservoir depends essentially on the geologic and geographic conditions of that area. It is first considered that the channel width does not change materially in the downstream direction. In many of the sandy rivers, there exists, a layer of gravel or pebble below the finer surface material. The inclination of this layer is generally steeper than the present bed slope. After the releasing of clear water from the reservoir, the surface material is carried away and thereby exposing the coarse layer, first near the dam and gradually extended to the downstream. This will result in an uneven erosion along the direction of the flow, and the steepening of the channel gradient is the consequence of such a process. The Colorado Eiver below the Hoover Dam belongs to this case. If the distribution of the bed material in the downstream, direction is more or less uniform, and if there exists no coarse layer within a finite depth below the bed surface, the bed will be degraded as a whole and the channel gradient remains essentially at its initial value. Results of flume study seem to indicate that such is the case. The Colorado Eiver below both the Parker and the Imperial Dam also belongs to this group. Only when there is a base level within a short distance from the dam which controls the depth of scour at that neighborhood, or if ther is a tributary which brings coarser material into the lower part of the reach, will the channel slope below the dam become flatter. On the other hand, if the river is impounded in a gorge and enters a plain not far away from the dam site, the width of the channel on the alluvial fan becomes progressively wider downstream. It is then possible that the depth of degradation decreases in the downstream direction and the slope becomes flatter. This case is well illustrated by one of the rivers in U. S. S. R. It must be realized that no matter how the channel gradient below an impounding reservoir changes, it is mainly through the coarsening of the bed material which makes the channel regains its equilibrium. Two different types of the coarsening of the bed material can be distinguished from the field data available. One of which is the exposing of a gravel or pebble layer below the present alluvium. As soon as this layer is exposed, there will be a sudden jump in the bed material size, and the stream channel becomes stable again. The othertype of coarsening of bed material takes place continuously and at a much slower rate. One often fails to notice the occurence of such a phenomenon, as the size of the bed material only increases in a relatively small amount. Yet, such a small increase in bed material size results in a much significantly rise of the roughness coefficient, by remolding the sand bars on the bed surface. Both the velocity of the flow and the sediment carrying capacity of the channel will be reduced, and the river gradually re-establishes its equilibrium. It is now possible to calculate such a proeess according to the theories on sediment transport and river roughness. Following the coarsening of the bed material, the down-cutting rate of the stream channel decreases with time. Both the flume studies and field measurements indicate that the relationship between the down-cutting rate and the cumulative time of erosion is an exponential one. This study demonstrates that the fluvial processes of an alluvial channel depend very much on the hydrographic conditions of the basin, of which the stream forms a part. One can't visualize the whole aspect of the problem (?)y studying the fluvial proteases through hydraulics, view-point only.

冲积河流上修建水库以后,下游河道将失去平衡。河流为了重新建立平衡,必将发生一系列的变化。本文对这—变化的过程,提出了一些新的概念。根据枢纽下游所在地区的地质地理条件,河流的坡降可以有各种不同的变化。坡降的渐趋和缓只是三种可能性中的一种,不能当做普遍规律来看待。河槽的重新建立平衡,主要是通过河床质的粗化作用。河床质的粗化现象具有两种不同的类型。一种是河床表层复盖物因清水冲刷而外移,露出了底下属于另一地质时代的较粗的卵石层,这时河床质的粒径会发生突变。另一种是由于水流的分迭作用,河床质的变化是连续的,徐缓的。在第二种情况下,河床质的粒径虽然变化不多,但是,通过河底沙垅的加多,却可以使曼宁糙率系数有很快的增加,这就使水流的流速降低,挟沙能力减小,河流逐渐建立起新的平衡。随着河床质的渐次粗化,河床的冲刷下切率与时俱減。野外实测结果及水槽试验成果都指出冲刷率与冲刷历时之间成一指数关系。河床质中不能为水流所挟运的颗粒所占百分比愈大,冲刷率下降得愈快,河道重新恢复平衡所需要的时间也愈短。从黄河下游的具体情况来判断,将来修建枢纽以后,下游河道在承受清水冲刷时可能作整体下降,坡降的变化不会很大。黄河下游的河床质虽然很细,同样也...

冲积河流上修建水库以后,下游河道将失去平衡。河流为了重新建立平衡,必将发生一系列的变化。本文对这—变化的过程,提出了一些新的概念。根据枢纽下游所在地区的地质地理条件,河流的坡降可以有各种不同的变化。坡降的渐趋和缓只是三种可能性中的一种,不能当做普遍规律来看待。河槽的重新建立平衡,主要是通过河床质的粗化作用。河床质的粗化现象具有两种不同的类型。一种是河床表层复盖物因清水冲刷而外移,露出了底下属于另一地质时代的较粗的卵石层,这时河床质的粒径会发生突变。另一种是由于水流的分迭作用,河床质的变化是连续的,徐缓的。在第二种情况下,河床质的粒径虽然变化不多,但是,通过河底沙垅的加多,却可以使曼宁糙率系数有很快的增加,这就使水流的流速降低,挟沙能力减小,河流逐渐建立起新的平衡。随着河床质的渐次粗化,河床的冲刷下切率与时俱減。野外实测结果及水槽试验成果都指出冲刷率与冲刷历时之间成一指数关系。河床质中不能为水流所挟运的颗粒所占百分比愈大,冲刷率下降得愈快,河道重新恢复平衡所需要的时间也愈短。从黄河下游的具体情况来判断,将来修建枢纽以后,下游河道在承受清水冲刷时可能作整体下降,坡降的变化不会很大。黄河下游的河床质虽然很细,同样也存在着粗化的可能。通过粗化作用,可以使河床下切的深度大大减低。

A rather widely employed method for the calculation of dam-site hydrographs due to the sudden release of a reservoir is to assume that the discharge formula for the steady flow over a broad-crested weir also holds for the case of unsteady flow under study. Among other things, however, the flow caused by the sudden release mentioned above is subject to high local accelerations and should therefore be governed by equations of motion quite different from those of steady flow. This leads the present writers...

A rather widely employed method for the calculation of dam-site hydrographs due to the sudden release of a reservoir is to assume that the discharge formula for the steady flow over a broad-crested weir also holds for the case of unsteady flow under study. Among other things, however, the flow caused by the sudden release mentioned above is subject to high local accelerations and should therefore be governed by equations of motion quite different from those of steady flow. This leads the present writers to choose another approach, i. e., to calculate the hydrographs desired by obtaining a direct solution of the basic differential equations governing the flow. A horizontal channel with negligible resistance is considered. While the channel is assumed to extend to infinity downstream, the reservoir is to be of f mite length. Also, the depth of water downstream is assumed to be less than 13.8% of the initial depth of the reservoir, so that, according to Stoker, flow in the part upstream of the dam is not affected by the conditions downstream. Under these assumptions, a solution may be obtained for the case of instantaneous and complete removal of the dam in terms of Legendre functions of fractional or integral degrees. Hydrographs computed on the basis of the solution so obtained are found to agree well with experimental data presented by Drobir [ 1 ] and Estrade [ 3 ]. Consequently, dimensionless dam-site hydrographs are given. These may be used as upstream boundary conditions when one tries to route a flood through the channel downstream of the dam. The writers wish to make it clear, however, that, although the solution to the basic equations obtained herein has been applied to the calculation of dam-site hydrographs only, it is mathematically valid everywhere in the channel.

溃坝洪水坝址过程线的近似分析,目前多采用宽顶堰公式进行计算。然而坝体瞬间溃决时,坝上游原来静止的水体迅猛加速,形成向上、下游传播的波动,其流态与恒定的堰流有较大的差异。 本文尝试从另一途径进行探讨。在平底、无阻力的简化条件下,应用特征线理论及黎曼方法获得了有限长棱柱体水库的溃坝波解。本阶段只考虑了坝体瞬间全部溃决及下游河道水深较小的情况,并假定河槽具有所谓抛物线形断面。分析成果与两家水槽试验资料作了对比,符合较好,说明本文的分析方法是正确的。 应用本文的理论解可算出突泄溃坝波的各种坝址过程线。文中对三种断面形式的明渠溃坝波进行了计算,提供了通用的无量纲坝址洪水过程线。

A prototype study was made on the effect of aerated flow for protecting a spillway surface from cavitation erosion, in view for use to other high head overflow structures. In 1976, block No. 9 of Fengman spillway was chosen for the site at which an aeration ramp and required test equipments were set up.The paper reports the test conditions and gives both the prototype and its model data containing the following various subjects:the discharge rate through the air vent, the underneath negative pressure over...

A prototype study was made on the effect of aerated flow for protecting a spillway surface from cavitation erosion, in view for use to other high head overflow structures. In 1976, block No. 9 of Fengman spillway was chosen for the site at which an aeration ramp and required test equipments were set up.The paper reports the test conditions and gives both the prototype and its model data containing the following various subjects:the discharge rate through the air vent, the underneath negative pressure over the aeration ramp, the impulsive force of the water jet on the spillway surf ace, the air concentration, the preventive length, etc.. The paper finally suggests the caring measures for Bengshan Dam spillway.

为了研究水流底层掺气减免气蚀的效果,为白山等高坝泄水建筑物提供安全可靠的减蚀措施,于1976年在丰满发电厂第九溢流坝段设置了半孔水流底层掺气挑坎及相应的观测设备,于1980年9月15日到22日进行了原型试验。本文介绍了这次试验情况,给出了通气管道的进气量、挑流掺气坝下游的空腔压力、坎后水舌落点附近的冲击压力、有关部位的掺气浓度以及掺气保护范围等资料。根据这些资料,对白山溢流坝通气减蚀设施的布置提出了建议。

 
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