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夫射者，非独胆挽强之技，实修身养气之道也。古之君子，六艺并习，而射居其一。故《礼》曰：“射以观德。”盖其所中者，不独皮侯，亦在人心焉。世人多好驰逐，争快斗强，独射者反是。其道贵静，其功在缓。缓而后稳，稳而后准，准而后神。​夫射之有靶，犹射频之有 Smith 圆图也。众线纷纭，终归一心；万点散布，所求惟中。射者执弓而望红心，犹工程师凝目于圆图之中央。盖其中心者，非徒图形之中，实“匹配”之境也。偏于上，则感性渐生；偏于下，则容性已起。稍失其中，则反射暗增，功率空耗；箭若离心，则力虽尽发，终不中的。故调谐之际，如射者调息：或微移电容，若轻转弓臂；或细调相位，如缓定呼吸。虽改动仅毫厘，而驻波顿减；正如箭道既正，百步穿杨。

Asciimath is a markup language used to write mathematical expressions using plain text. It’s often used in online forums, blogs, and websites where users want to display math equations without using complex mathematical notation. ASCII Math provides a simple and intuitive way to represent mathematical symbols and expressions using standard keyboard characters. Operation symbols Type … Read more

Contour plot of the transverse electric mode in a circular cross section wave-guides. Plot real functions for one variable. Wave guide tool: TE mode in circular wave-guide | Cutoff radius for TE mode in a circular waveguide | corrugated waveguide | rectangle waveguide | Waveguide Pattern Visualizer Plasma tool permittivity stix Edit tool Latex replace … Read more