van n. 范〔男子名〕。 n. 1.(有盖的)载货大马车,搬运车;【铁路】行李车,有盖货车。 2.(吉卜赛人所住的)大篷车;囚车。 a luggage van行李车。 a radio diffusion van广播车。 a television reporting van流动电视车。 vt. 用车搬运(货物)。 n. -ner 大棚车车主。 n. 1.【军事】先锋,前锋部队[舰队]。 2.先驱,前驱;领袖,领导人(= vanguard)。 in the van of 在…的前列,作为先驱,领导着。 lead the van of 担任…的先驱。 n. 1.〔古、方〕簸扬器[机]。 2.〔古、诗〕翼。 3.【矿物】洗矿铲。 vt. 选(矿)。 van4 〔荷兰语〕= of, from 〔出现于荷兰人姓名中,表示出生地,亦作 Van〕。
The van allen belts are composed of charged particles trapped by the earth's magnetic field . 范阿伦带由地球磁场俘获的带电粒子所组成。
Van allen belt 范艾伦辐射带
Van allen belts 范艾伦带
For this reason , extreme radiation hardness and high power / weight ratio solar cells , which can work properly in van allen belts , must be developed 因此,为了能使通信卫星在vanallen辐射带正常工作,必须要有一种强抗辐射并且具有较高重量比功率的太阳电池。
While the magnetic field on the earth which traps charged particles encircling the earth into radiation belts called the van allen belts normally protects our planet from the solar wind , it may be deformed in the event of violent solar wind , resulting in a geomagnetic storm on earth 虽然地球上的磁场能将环绕地球的带电荷粒子困于其辐射带van allen belts ,一般能有效阻挡太阳风,但在猛烈太阳风情况下它可能受影响而变形,导致地磁暴的出现。
While the magnetic field on the earth ( which traps charged particles encircling the earth into radiation belts called the van allen belts ) normally protects our planet from the solar wind , it may be deformed in the event of violent solar wind , resulting in a geomagnetic storm on earth 虽然地球上的磁场能将环绕地球的带电荷粒子困于其辐射带( vanallenbelts ) ,一般能有效阻挡太阳风,但在猛烈太阳风情况下它可能受影响而变形,导致地磁暴的出现。
At present , the solar cells used on space aircrafts are still mainly si and gaas solar cells . however , the radiation resistance ability of these two materials is poor . since the photoelectric conversion efficiency attenuates rapidly with the radiation , the lifetime of si and gaas solar cells is short and their stability is not satisfied for space applications at van allen belt 目前国内外用于航天器上的太阳电池主要为si和gaas太阳电池,但这两种材料的抗辐射能力较差,其光电转换效率由于高空辐射衰减很快,因而寿命短,稳定性差,不能满足用于vanallen强辐射带的空间应用需要。