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Based on the study and analysis of Y-shaped atomizers and their atomization mechanism, a new-type of fan-shaped spray atomizer is developed and experimentally studied.

在对Y型喷嘴结构和雾化机理研究分析的基础上,设计了一种新型的扇形雾化喷嘴,并对该喷嘴进行了实验研究。

Through analysis 49 inclined basin large-angle fan seam to fifth coal mine of Fengfeng mining bureau,mining working isn′t safety with conventional trapezoid support, it isn′t rational,too in economy, coal getting working can′t be contented irregular trapezoid section I-steel support is adapted at first,it solves technical problem of mining,and gains good ecomomic and social result.

通过对峰峰矿务局五矿 4 9向斜盆地大倾角扇形煤层条件的研究分析 ,采用常规梯形支护 ,开掘生产不安全、经济上不合理 ,而且还不能满足回采生产的需要。

This paper proves that the coronas of fans are sequential graphs.

研究扇形的冠 ,证明了扇形的冠都是序列

A practicable analytic solusion is obtained for any sector by means of Fourier series with singular items.

从位移场带奇性分离的Ｆｏｕｒｉｅｒ级数表达式着手，得到扇形问题可实际操作的解析解，可以证明此级数解法与Ｗｉｌｉａｍｓ分离变量法等价。