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a base     
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  一个基
     The largest transmitted power of a base station is not more than 1.94 dB compared with conventional system when crosscorrelation is less 20%.
     当特征波形互相关系数小于20%时,和传统系统相比一个基站的总发射功率不会大于1.94dB
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     The original mesh with multiresolution representation is decomposed into a base mesh and a set of wavelet coefficient vectors by applying the wavelet transform.
     该算法对半规则的多分辨率网格进行小波变换,得到一个基网格和一系列小波系数。
短句来源
     By combining with telecom business and component GIS technology, a management system for a base station is studied, designed and realized.
     结合电信业务和组件GIS技术,设计并实现了一个基站管理系统。
短句来源
     (2) a base of R n can be normal orthogonalized by elementary operation of matrix. A simple and convenient method of orthogonaligation and a method of QR decomposition of matrix are drawed from these conclusions.
     (2)经过矩阵的初等变换可将Rn的一个基标准正交化.并从这两个结论中得到向量组正交化的一种简便方法和矩阵QR分解的一种方法
短句来源
     A group of k variables is called a base if the coprelation coefficients of response and each variable in the group are big, and the correlation coefficients between the pairs of variables in the group are small.
     假定自变量中有一组k个变量,如果因变量与组中每个自变量的相关系数都很大,而组中任意两个自变量之间的相关系数都很小,则称这组k个自变量为一个基组。
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  一个基础
     This system can be mainly used in image analysing of cancer cell to take a base on earlier can cer diagnosis.
     该系统主要用于癌细胞的图像分析,能作出定量计算,为癌症的早期诊断打下一个基础
短句来源
     2. provide a base for further research in this area.
     2.为这一领域的进一步研究提供一个基础
短句来源
     The gravity models are given and can be taken as a base of further geological and geophysical research of this area.
     给出了该地区重力异常模型 ,可作为综合地质与地球物理研究的一个基础
短句来源
     By using VC++,collecting equipment data through serial port is designed and realized,and the processed data are stored into database through ODBC interface. The design results complete real-time and dynamic data display,provide a visual interface which is convenient for modification and supervision and control,and provide a base platform for developing EIB serial communication.
     使用VC++设计实现了串口采集EIB总线上的设备数据,并将处理后的数据通过ODBC接口保存到数据库中,设计结果完成了数据的实时和动态显示,为用户提供了一个可视化的界面,有利于数据的修改和监测,并为EIB串口通信的开发提供了一个基础平台。
短句来源
     Data storage system is a support system for digital library. It′s a base and an important component part to digital library construction.
     存储系统作为数字图书馆的支撑平台,是数字图书馆建设的一个基础和重要组成部分.
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  a的碱基
     1027G >A base pair transversion with a predicted amino acid residue change V330I were detected in MEPE; a c.
     1027G>A的碱基变化,该变化导致MEPE出现V330I的氨基酸变化,在IBSP发现c.
短句来源
     797G >A base pair transversion with a predicted amino acid residue change G219R were detected in IBSP, without the correlation between the families and phenotypes.
     797G>A的碱基变化,该变化导致IBSP出现G219R的氨基酸变化。 两种变化在家系内与表型不存在一一对应关系。
短句来源
  降低
     Results The rate of iodine uptake abase apparently,the different herd has notability divergent.
     结果全民普及新浓度碘盐后,人群甲状腺吸碘率明显降低,不同人群甲状腺吸碘率有显著性差异。
短句来源
     Pipeline occluded can abase energy and reduce the environmental pollution and save the cost, the SCADA system is the assurance of safe operation for this technology.
     管道密闭输送能降低能耗、减少环境污染、节约成本 ,SCADA系统是该工艺安全运行的保证。
短句来源
     Conclusion:The study demonstrates that parenteral nutrition support at super-early stage can obtain more thermal capacity and protein, ameliorate nitrogen balance, accelerate synthesis of serum protein, promote reparation of traumatic tissue and restoration of neural function, abase mortality and deformity and elevate survival value for patients with serious cerebral injuries .
     结论 :超早期胃肠外营养可以使严重脑外伤患者获得较多的热能和蛋白质 ,改善氮平衡 ,加快血清蛋白质的合成 ,促进创伤组织的修复和神经功能恢复 ,达到降低病死率和致残率 ,提高生存质量的目的。
短句来源
     According to the elements symmetry distributed in axis, the scattering coeffecient of whole antenna array can be achieved by calculating part of elements, and abase the influence by mutual coupling .
     根据阵列单元轴向对称分布的特点,通过计算部分单元获得整个阵列天线单元间的散射系数矩阵,降低了互耦的影响。
短句来源
     Conclusion: on the basis of conventional western medicine yufengxiaoban soup combined with defecate and meal management was superior to conventional western medicine which can shorten the acute course of allergic purpura, decrease the recurrence ratio , abase the damage of kidney function and scant the side function.
     结论:在常规西药治疗基础上加用愈风消斑汤配合大便、饮食管理在缩短过敏性紫癜急性期病程,减少复发,降低肾脏受累发生率及降低副作用方面优于常规西药治疗。
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      a base
    These results might serve as a base for quality evaluation of Magnetitum (Cishi).
          
    The design of self-testing synchronous automaton networks in a base of programmable logical matrices is studied.
          
    Such a representation is helpful in expressing an ordered system of functions by a unified formula in a base of binary operations.
          
    In this way, we provide a base to extend the application of ARs and related powerful CAD design tools for switching functions to functions in Fibonacci interconnection topologies.
          
    The results show that the best fitting corresponds to a 1: 1 complex model between a base pair of DNA and these materials.
          
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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。

    Weakly acidic cation exchangers in bead form have been prepared by thefollowing methods: (1) copolymerization of methyl methacrylate with a variableamount of 55% solution of divinylbenzene, followed by hydrolysis either withan acid or a base; (2) copolymerization of methacrylic acid with a variableamount of 55% solution of divinyIbenzene; (3) copolymerization of methacrylicacid with allyl methacrylate and a 55% solution of divinylbenzene. The resins obtained by the first method possess low capacities....

    Weakly acidic cation exchangers in bead form have been prepared by thefollowing methods: (1) copolymerization of methyl methacrylate with a variableamount of 55% solution of divinylbenzene, followed by hydrolysis either withan acid or a base; (2) copolymerization of methacrylic acid with a variableamount of 55% solution of divinyIbenzene; (3) copolymerization of methacrylicacid with allyl methacrylate and a 55% solution of divinylbenzene. The resins obtained by the first method possess low capacities. This isprobably due to the fact that copolymer of methyl methacrylate anddivinylbenzene resists hydrolysis. The resins prepared by the second and thirdmethods have high capacities and are opaque. They might be the so-called"popcorn polymer". These resins have desirable properties.

    球状弱酸性阳离子交换剂可由下列方法制成:(1)甲基丙烯酸甲酷与不同黄的55%苯二乙烯溶液共聚合.随用酸或碱水解之。(2)甲基丙烯酸与不同量的55%苯二乙烯溶液共聚合。(3)甲基丙烯酸,甲基丙烯酸丙烯酯,与55%苯二乙烯溶液共聚合。由第一法制得的树脂交换量不高,很明显是因甲基丙烯酸甲酯-苯二乙烯的共聚体不易水解的缘故。由第二、第三法制得的树脂交换量很高且表面是不透明的。这可能为通称的“玉米花”聚合体。这些树脂具有良好的性能。

    The apparent acid dissociation constants of N-phenylglycine and of N-α-naphthylglycinehave been determined by pH method at 25℃ in 30% ethanol solution in the presence of 0.10Msodium perchlorate.That of glycine was also determined under the same conditions for thepurpose of comparison.These amino acids were found to have comparable acid strengths,but their basicity is quite different.N-phenylglycine as a base is much weaker thanglycine as expected,while N-α-naphthylglycine shows very strong base strength...

    The apparent acid dissociation constants of N-phenylglycine and of N-α-naphthylglycinehave been determined by pH method at 25℃ in 30% ethanol solution in the presence of 0.10Msodium perchlorate.That of glycine was also determined under the same conditions for thepurpose of comparison.These amino acids were found to have comparable acid strengths,but their basicity is quite different.N-phenylglycine as a base is much weaker thanglycine as expected,while N-α-naphthylglycine shows very strong base strength which is inthe same order as that of the N-alkylglycines.This anomaly was explained in terms ofsteric effect due to the 8-hydrogen atom on the naphthalene ring upon the proton on theamino group.The lowering of dielectric constant of the solvent led to the decrease of both acid andbase strengths of glycine.

    在25℃时及0.10M NaClO_4存在下,N-苯氨基乙酸((?)G)和 N-α-萘氨基乙酸(αNG)在30%(体积)乙醇中的表观离解常数用 pH 法测定为(?)G:pK_(COOH)=2.69,pK_(R_2NH_2)~+=4.72;αNG:pK_(COOH)=2.64,pK_(R_2NH_2)~+=10.83。为便于比较,氨基乙酸(G)的离解常数亦在相同情况下测定为 pK_(COOH)=2.71,pK_(R_2NH_2)~+=9.30。(?)G 和αNG 的硷性强度相差如此巨大,主要是由于后者有位阻效应之故。(?)G 的硷性比 G 的弱得多,因共轭效应起决定性的作用。改变溶剂的介电常数的结果是使氨基酸的酸硷性均减弱。

     
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