population n. 1.人口;人口總數(shù);全體居民;人口的聚居。 2.物的全體[總數(shù)];【生物學(xué)】蟲口;種群(量);群體;族,組,個(gè)數(shù);【統(tǒng)計(jì)學(xué)】對(duì)象總體,全域。 3.【物理學(xué)】布居;密度。 4.〔罕用語〕殖民。 varietal populations 品種群體。
electron n. 【物理學(xué)】電子。 the electron beam 電子束。 the electron theory 電子(學(xué))說。
Using the two - stream fluid model , the linear dispersion relation is derived assuming a two - dimensional spatial geometry . two cases are considered , one is that the 2d spatial geometry is defined by the plane containing the two counterstreaming electron populations and the perturbation wave vector ( referred as the xy plane ) , and the other is that the geometry is defined by the plane being vertical to the two counterstreaming electron populations ( referred as the yz plane ) 對(duì)高能束流和電子回流構(gòu)成的雙流系統(tǒng),建立冷等離子體流體模型,采用簡正模分析方法,分別考慮擾動(dòng)波矢在平行于電流傳播方向的平面(記為xy平面)上和在垂直于電流傳播方向的平面(記為yz平面)上這兩種情況,推導(dǎo)了不穩(wěn)定性的色散關(guān)系。