卦象、卦名、卦辞、爻辞的解释(Theimages,guaming,divination,yaociexplanation)manifestationofadivination"Copulative":"easy,alsolike"."Tuan,peaceislike"."Erectanimage,doallthatonedesires,andsetahexagramtomakeafalseimpression.""."Eightdiagramsmakeacolumn,andanelephantisinit."!"Theancienteighttrigrams,twotosixt...
Cathode rays are normally invisible beams of particles that can be contained within vacuum tubes for observation. If cathode rays are combined with fluorescent materials, they can be made visible to the naked eye. Vacuum tubes that can contain cathode rays are called cathode ray tubes. ...
Here are three examples to help practice drawing ray diagrams for convex lenses. Example of an Object Farther Away Than the Focal Length A pencil is placed 25 cm away from a convex lens which has a focal length of 10 cm. Draw the ray diagram for the image of the pencil. ...
One of the most common electronics learning example circuits using the NE555 is to flash two LEDs. This is a great example of how the output can both source and sink current, and we have used it in the diagrams explaining the charging and discharging phases of the timer. In astable mode,...