Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.

加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。

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The simulation program PROPER-MT for analysis of multiple-pulse and two-dimensional FT NMR experiments using the algebra of product operators is reported.

本文报道了利用乘积算符方法分析多脉冲及二维FT-NMR实验的模拟程序PROPER-MT。

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