The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches.

2015年12月17日 · 此附加滤板是为建立标准辐射质量rqa而模拟患者所 需的适当厚度的铝板，按照行业标准的要求应是纯度至少 为99.9%的单层铝板，应能完全遮挡光阑出射面的全部X

Recurrence quantification analysis (RQA) is a method of nonlinear data analysis (cf. chaos theory) for the investigation of dynamical systems. It quantifies the number and duration of recurrences of a dynamical system presented by its phase space trajectory.

What is an acceptable tolerance range for RQA beam qualities? IEC 61267 specifies two ways to reach the tolerance of RQA. The preferred method as defined in section 5.5 is to rely on the accuracy of RQR to reach the nominal target for RQA.

为此，实施了一种算法来计算 rqa 标准辐射质量每个空气比分的平方信噪比的变化，并根据 gum 增补 2 推断出相应的不确定性。对于 rqa 标准辐射质量，结果显示每个空气比丘的平方信噪比的标准不确定性在 0.05 到 2.1% 之间。

Radiography system calibration and testing requires the beam quality defined in IEC 61267. To produce the RQA series of beam qualities with the IEC procedure, 99.9% pure Aluminum (Al) is needed, which is very difficult to access and procedural steps that are not well suited for the clinical environment must be performed.

BLASTN programs search nucleotide databases using a nucleotide query. more... Enter organism common name, binomial, or tax id. Only 20 top taxa will be shown Help.

Entrance spectra of RQA5 and 120 kV for the top and bottom layers. [Color figure can be viewed at wileyonlinelibrary.com] [...] Purpose: Dual-energy (DE) x-ray imaging has many clinical...

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