Because of the phenomenon that the negative self-scattering cross sections cause the negative probability sample, a nonnegative corrected method is put forward and validated by the benchmark problems.
针对输运修正引起的自散射截面导致的负概率抽样现象，提出了一种非负修正方法，并用基准计算验证了该方法的正确性。
A snowball sampling non-probability sample was used.
样本的取样方式采取 非机率型之滚雪球抽样法。
A snowball sampling non-probability sample was used.
样本的取样方式采取 非机率型之滚雪球抽样法。
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