源远

静止介质中点声源远场噪声的数值预测

Numerical prediction of point source far - field noise in stationary medium

组合圆形活塞声源远场指向性理论研究

Far field directivity of built-up circular piston sound source

分散的小污染源远多于大污染源。

The small individual sources of pollution are far more numerous than the large ones .

震中距在50°左右的深源远震，直达波S波震相波列可以与其他震相波列分离。

The direct S wave phase of deep teleseisms with epicentral distance of about 50 ° can be separated from other seismic phases .

由深源远震体波记录反演华北北部地壳上地幔速度结构

Inverse of velocity structure of upper mantle of crust in northern part of North China by body wave recordings of deep focus distant earthquakes

利用深源远震的纯S波波形拟合方法研究了鄂尔多斯块体及其东、南缘的剪切波速度结构。

Using pure S wave fitting method , the authors studied shear wave velocity structure under the Ordos plate and its southeastern marginal aeras .

源远博大的赣文化具有旅游的观赏价值、体验价值、教育价值、科研价值。

In terms of traveling , the vast cultural resources in Jiangxi are of ornamental value , experimental value , experimental value and scientific value .

作为探寻自然和人的关系的一种独具特色的文学样式，英美生态文学有其源远的浪漫传统，回归自然是其永恒的主题和梦想。

As a unique literary style to explore the human-nature relationship , it bears a deep romantic tradition and a forever theme of returning to nature .

在拟合时，对每个地震台站都选择若干次深源远震的体波记录作为观测图。

In titting , for each seismic station , the body wave recordings of deep focus distant earthquakes were selected for several times to be as observed seismograms .

土地和耕地的研究源远沉长，且研究内容随社会进步和生产力发展也在不断的变化。

The studies on them have a long history , and the contents of the research ceaselessly change with the advancement of society and the development of productivity .

普洱茶的历史源远而流长，普洱茶的传奇风流而蕴籍，普洱茶的滋味古朴而淳正，普洱茶的艺术丰富而深厚。

Pu'er tea has a long standing history , implying the romantic and inductive legend , with a primitive simplicity and pure tasty and containing the abundant and profound art .

收集山西省数字台网记录的深源远震S波，采用S波理论波形拟合的方法，获得了山西省境内共6个台站下方的剪切波速度结构。

Based on S wave records of deep teleseisms on Shanxi Province Digital Network , and by modeling S wave waveform , shear wave velocity structures under 6 stations were obtained .

结果表明，与无限大障板情况相比，基于镜像原理的组合声源远场指向性更能真实反映声化学反应器内声场的分布。

Compared with the far field directivity on infinite barrier plate , the result indicates that the directivity of built-up sound source based on principle of mirror image exhibits more actually the distribution of sound field in sonochemical reactor .

但是，金属硒化物纳米晶体并不像金属硫化物那样轻易制得，这主要是因为硒源远比硫源难于获得，并且高温高压等反应条件不易控制等原因造成的。

However , the metal selenium compounds nanocrystalline is not as easily obtained as metal sulfide for the source of selenium is difficult to prepare than sulfur . Another causes is that the preparation of selenium compounds need high-pressure and high-temperature conditions .

采用Kirchhoff方法计算点声源的远场气动噪声。

The far-field aerodynamic noise generated by a point source is calculated using the Kirchhoff ′ s method .

有限基本解法中不可压源的远场近似

The Far-field Approximations of Incompressible Sources Used in Finite Elementary Solutions

六边形活塞声源辐射远场研究

Radiant far field of hexagonal piston sound source

但是，由于基座离故障源较远，采集到的振动信号比较微弱，所以目前基于基座的故障诊断技术尚处于探索阶段。

However , current research in this area is rare because the base far away from the fault source and the vibration signals collected relatively weak .

苹果、柿和银杏等比较适合阻挡沙尘还有利于当地经济，而在离沙尘源较远的城市（如北京）种植具有较大附尘力的植物有利于净化空气。

And in the cities , such as Beijing and other dust areas , the plants have high dust _carrying capacity can be planted for air cleaning .

利用瑞利积分，计算了六边形活塞声源辐射远场的声压分布以及指向性公式，并对指向性公式进行仿真研究。

Based on Reily-integration , the sound pressure distribution and directivity formula of hexagonal piston ′ s radiant far field are calculated out . And the directivity formula is simulated .

当频率较高或自由表面距离球源较远时，自由表面对脉动球源辐射声功率的影响是不大的；

However , the effect of the free surface on the acoustic power is insignificant when the surface is far away from the sphere or the excitation frequency is in the high frequency range .

随着食品工业的不断发展，传统糖源已远不能满足生产需要，各国研究者不断地寻找新的来源。

With the development of food industry , the supply of sweetener produced by traditional method is not sufficient for its production , so the researchers are looking for the alternate sources to make supply sufficient .

对于负压沿程分布而言，干管和支管的水锤负压值都达到了极限负压值。（7）距离瞬变源越远，水锤压力值就越小。

As far as the negative pressure friction distribution is concerned , negative pressure values of water hammer for both trunk and branch have achieved limit negative pressure value . ( 7 ) The further the distance transient source is , the smaller the water hammer pressure head is .

对亲源关系较远的物种，它们的CaM主要免疫反应位点和靶酶结合位点间的差异大于它们全序列间的差异。。新种与李氏盲蚁A.因此这两个种亲缘上是相近的。

The similarities of main immunoreactive site and target enzyme-binding site between every two kinds of CaM , were greater than those of complete sequences among those close species in evolution , but smaller among those farther species .

脉动柱面声源线阵列远场特性的研究

Study on far field characteristics of line array of pulsating cylinder sound sources

得出了在重气毒性阈值较低的情况下，近源区和远源区中毒风险一样高等结论。

Risk of poisoning in near-source zones and far-source zones can be equally provided that toxic threshold is low enough .

凹陷湖岭落差小物源相对较远，生储配置条件差，寻找油气藏的条件苛刻。

The fall of lake-mountain in it is low and sources are relatively farther , oil generation and accumulation conditions are poor .

由于距离烃源岩较远，油气运移聚集条件成为地层圈闭成藏的主要控制因素。

Due to far away from the hydrocarbon source rock , oil-gas migration and building-up conditions became the main controlling factor of the formation trap reservoir forming .

随着距离物源区越远，同一层段从北向南，从西向东结构成熟度逐渐增高。

As the distance from the source area increases , the structure maturity within each member gradually increases form north to south and from west to east .

结果表明，与圆形、方形活塞的辐射远场相比，在声波频率、活塞面积相同条件下，六边形活塞声源的辐射远场相对比较均匀。

Through comparison , it shows that at the same value of frequency and size , the far field of hexagonal piston is more uniform than that of circular piston .