A diode is a solid state passive device that will only allow current to flow in one and only one direction (Anode->Cathode). A Thyristor behaves exactly like a Diode except that in order for current to flow it must "see" current at its gate, if it does not see current (ie logic 0 or ground) then current is not allowed to flow from its anode to cathode.
Note: The Thyristor gate requires little current to trigger its gate, meaning a small amount of current can be used to switch on/off a load require much more current.
Another Note: Since the Thyristor has a gate which controls its output it is not a passive device like the diode
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Thyristors are four layer devices and transistors are three layer devices.
Just from looking at them, no, it is not evident whether you are seeing a thyristor or transistor, unless you have some knowledge of the circuit it is in. Both are three terminal devices, meaning there are three wires coming out of them, and at least in the smaller sizes they come in the same footprints. If the part you're looking at has an identifying number, an internet search for that part will quickly tell you what you're looking at.
thyristors have 4 semiconductor layers (3 Junction&terminals)
diode has 2 semiconductor layers(only one junction , 2 terminals)
Visible means that the property can be used, but is not visible in the graphical user interface. But, if the user were to click a control that edit the objects properties, the object would change even if it isn't visible. Enabled/Disable means that for instance if the object is Disabled, it's still visible but the user cannot interact with it. This means, that if code is executed for the control that is disabled, nothing will change to that control.
Robotics generally refers to things created of a size that is visible by the human eye. Nanotechnology on the other hand, refers to things created that are microscopic.
Default- visible to the packagePublic - visible to allProtected- visible to the package and all subclassesPrivate- visible to the class
In most cases, everything except the DOCTYPE declaration will be between <html> tags. The visible content of your page will usually be between <body> tags.
To measure penetration of a weld, one must cut and etch the weld, preferably on a test coupon. Etching is just using an acid that will discolor the weld metal so that there is a visible difference between the weld metal and the base metal. Once the acid has taken affect, one can measure the weld using calipers or a similar measuring device.