查询词典 biased sample

Obvious energy transfer was observed without using a biased field in the sample, which proved that the PR effect exists in the material.

以He-Ne激光器为光源，我们搭建了双光束耦合实验平台，在不加电场条件下，观察到了明显的能量转移现象，验证了光折变效应的存在。

The result shows that the Singapore airline route does not have characteristic of the small-world network. However, the present paper chooses the inappropriate sample resulting in biased result through careful inspection of the calculation process, so the hypothesis that the network connectivity pattern has the characteristic of small-world network cannot be rejected by the experiment result.

结果显示新加坡航空公司之飞机航线网络似乎具备小世界网络之特性，但再检视推算过程发现验证结果的符应是样本选择偏误所造成的，因此本文认为实证结果并无法完全推翻全球城市网络结型态是具备小世界特性之研究假。

During the PL measurement excited by 405nm diode laser, the decreasing PL intensities of the biased LED sample were observed by increasing the measurement temperature that was caused by the thermal and tunneling effect to have the lower internal quantum efficiency.

在光激发萤光系统上，以405nm波长的雷射作为激发光源，在外加偏压测试环境下可以发现室温(300K)强度因载子热效应与穿隧效应而快速递减，导致内部量子效率较实际值低。

We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.

讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。

The anode structure of CI-LIGBT is optimized by numerical simulation, and it is pointed out that segmented p〓 anode region surrounded by n〓 anode region is the key to improve the ability of current limiting, and the more deeper the n〓 anode junction relative to the p〓 anode junction, the more powerful the ability of current limiting is. The affection of the breakdown voltage BV〓 of the reverse biased p〓n〓 junction and the sample resistance upon the latching current, the latching voltage and the on-state voltage have been studied, and it is indicated that the tradeoff between the on-state voltage and the latching characteristics is the excellentest when BV〓 is 1. 1V so that its on-state voltage can be just only 0.6V higher than conventional LIGBT. It is also found that this device is especially suit to high temperature environment. Based on X. B. Chen's surface voltage sustaining structure using optimized variational lateral doping and Ludikhuize's multiple floating rings structure, high voltage LIGBT and is studied in this paper.

通过数值模拟，优化了CI-LIGBT的阳极区结构，指出采用被n〓阳极区包围的单元状p〓阳极区是提高该器件限流能力的关键，而n〓阳极区结深相对p〓阳极区结深越大，器件的限流能力越强；分析了反偏p〓n〓结击穿电压BV〓和取样电阻对器件闩锁电压、闩锁电流和导通压降的影响，得出BV〓在1.1V时器件导通压降和抗闩锁能力间的折衷关系最优，其导通压降仅比普通LIGBT高0.6V；分析了温度对LIGBT闩锁性能的影响，表明CI-LIGBT即使在450K的高温下也不会闩锁，尤其适用于高温工作环境。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。