bias n. 1.成见,先入之见,偏执,偏见 (opp. Impartiality ); 倾向,嗜好;癖 (towards)。 2.(衣服等上面缝的)斜线,斜痕;【无线电】偏,偏压;偏置。 3.【体育】使球斜进的偏力;(球的)歪圆形;不按直线前进的倾向;【电学】偏压;【统计学】倾向统计值;【生物学】偏倚。 a racial bias种族偏见。 A strong musical bias 对音乐的强烈爱好。 Copper bias 【电学】正偏压。 Zinc bias 【电学】负偏压。 Cut on the bias 斜裁,斜切。 Be free from bias 丝毫不受偏见左右。 Be under a bias in favor of [against] 对…有偏爱[偏见]。 Have a bias to [towards] 对…有偏心。 Without bias and without favour 不偏不倚地,公公平平地。 adj. 斜的;【电学】偏动的。 Bias bands 斜带。 adv. 斜,偏。 Cut material bias 斜切料,斜开料,斜裁。 vt. (biased, biasing 〔英国〕 biassed, biassing) 1.使有偏见,使偏重,使偏向一方。 2.【电学】加偏压于。 be bias(s)ed against 对…抱有偏见。 Bias … into 【电学】加偏压使进入…。 My ignorance biased me against my teacher. 我由于无知而对老师抱有偏见。 adj. -ed 有偏见的。
zero n. (pl. zeros, zeroes) 1.【数学】零;零号。 2.零位;零点,起点;(温度表的)零度,冰点;座标原点;无。 3.最低点;【天文学】天底;【航空】零高度。 4.没价值的人[物]。 5.【军事】= zero hour. the absolute zero 【物理学】绝对零度〔-273.16℃〕。 the air zero 原子弹空中爆炸中心。 fly at zero 超低空(1000英尺高度以下的)飞行。 vt. 1.把(调节器等)调整到零位。 2.把…减少到零位。 zero in 1. 调整(枪炮的)射距,把(枪炮等的标尺)调整到标准无风部位瞄准。 2. 把(火力)对准目标 (on)。 zero out 给…以免税待遇(to zero out funding for public broadcasting 对用于公共广播的经费实行免税)。 adj. 1.零(度)的。 2.【气象学】云幕低于50英尺,能见度小于165英尺的。
We have investigated transport properties of electrons in magnetic quantum structures under an applied constant electric field . the transmission coefficient and current density have been calculated for electron tunneling through structures consisting of identical magnetic barriers and magnetic wells and structures consisting of unidentical magnetic barriers and magnetic wells . it is shown that the transmission coefficient of electrons in a wider nonresonance energy region is enhanced under an applied electric field . the resonance is suppressed for electron tunneling through double - barrier magnetic ( dbm ) structures arranged with identical magnetic barriers and magnetic wells . incomplete resonance at zero bias is changed to complete resonance at proper bias for electron tunneling through dbm structures arranged with different magnetic barriers and magnetic wells . the results also indicate that there exist negative conductivity and noticeable size effect in dbm structures 对磁量子结构中电子在外加恒定电场下的输运性质进行了研究.分别计算了电子隧穿相同磁垒磁阱和不同磁垒磁阱构成的两种磁量子结构的传输概率和电流密度.计算结果表明,在相当宽广的非共振电子入射能区,外加电场下电子的传输概率比无电场时增加.对于电子隧穿相同磁垒磁阱构成的双磁垒结构,共振减弱;对于电子隧穿不同磁垒磁阱构成的双磁垒结构,无电场作用时的非完全共振在适当的偏置电压下转化为完全共振,这时的电子可实现理想的共振隧穿.研究同时表明,磁量子结构中存在着显著的量子尺寸效应和负微分电导
The performance of modulators employing mqw is governed by the quantum confined stark effect . in order to simplify the analysis of mqw , we obtain an explicit formula concerning the correlations between the gaas / gaalas quantum well widths of finite potential barrier structure and those of infinite potential barrier structure under the condition that the ground state energies are equal at zero bias states . then the transfer matrix method is used to investigate the optical field distribution in the mqw waveguide based on five - step asymmetric coupled quantum well structure that is really used in the modulator 本论文首先根据量子限制stark效应,发展了等效宽度思想,提出了把单量子阱结构的有限深势阱的分析转化为无限深势阱模型的显式公式,从而大大简化了电场下量子阱结构的分析;接着利用转移矩阵,把周期性的量子阱结构简化为三层结构,得到了实际采用的非对称三阱结构量子阱的场分布,并讨论了量子阱结构的偏振特性。