1918 Spanish Flu waves

This line graph sample shows three pandemic waves: weekly combined influenza and pneumonia mortality, United Kingdom, 1918–1919. It was designed on the base of the Wikimedia Commons file: 1918 spanish flu waves.gif. [commons.wikimedia.org/ wiki/ File:1918_ spanish_ flu_ waves.gif]
"The 1918 flu pandemic (January 1918 – December 1920) was an unusually deadly influenza pandemic, the first of the two pandemics involving H1N1 influenza virus. It infected 500 million people across the world, including remote Pacific islands and the Arctic, and resulted in the deaths of 50 to 100 million (three to five percent of the world's population), making it one of the deadliest natural disasters in human history." [1918 flu pandemic. Wikipedia]
The line chart example "1918 Spanish Flu waves" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Line Graphs solution from the Graphs and Charts area of ConceptDraw Solution Park.

This area chart sample shows the US federal prisoner population changes from 1914 to 2010.
"The Federal Bureau of Prisons (BOP) is a United States federal law enforcement agency. A subdivision of the U.S. Department of Justice, the Bureau is responsible for the administration of the federal prison system. The system also handles prisoners who committed acts considered felonies under the District of Columbia's law. The Bureau was established in 1930 to provide more progressive and humane care for federal inmates, to professionalize the prison service, and to ensure consistent and centralized administration of the 11 federal prisons in operation at the time.
According to its official web site, the Bureau consists of more than 116 institutions, six regional offices, its headquarters office in Washington, D.C., two staff training centers, and 22 community corrections offices, and is responsible for the custody and care of approximately 210,000 federal offenders. Approximately 82 percent of these inmates are confined in Bureau-operated correctional facilities or detention centers. The remainder are confined through agreements with state and local governments or through contracts with privately operated community corrections centers, detention centers, prisons, and juvenile facilities." [Federal Bureau of Prisons. Wikipedia]
This area graph sample was redesigned from the Wikimedia Commons file: Federal timeline US prisoners.gif. [commons.wikimedia.org/ wiki/ File:Federal_ timeline_ US_ prisoners.gif]
The area chart example "Federal timeline US prisoners" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Area Charts solution from the Graphs and Charts area of ConceptDraw Solution Park.

"In electronics, a vacuum tube, electron tube (in North America), tube, or thermionic valve or valve (in British English) is a device controlling electric current through a vacuum in a sealed container. The simplest vacuum tube, the diode, contains only two elements; current can only flow in one direction through the device between the two electrodes, as electrons emitted by the hot cathode travel through the tube and are collected by the anode. Addition of a third and additional electrodes allows the current flowing between cathode and anode to be controlled in various ways. The device can be used as an electronic amplifier, a rectifier, an electronically controlled switch, an oscillator, and for other purposes.
Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Some electron tube devices rely on the properties of a discharge through an ionized gas." [Vacuum tube. Wikipedia]
"The EL34 is a thermionic valve or vacuum tube of the power pentode type. It has an international octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The American RETMA tube designation number for this tube is 6CA7. Russian analog is 6P27S (Cyrillic: 6П27C )" [EL34. Wikipedia]
This circuit diagram sample was redrawn from the Wikipedia Commons file: EL34 schematics (circuit diagram).gif. [commons.wikimedia.org/ wiki/ File:EL34_ schematics_ %28circuit_ diagram%29.gif]
The example "Circuit diagram - EL 34 schematics" was drawn using the ConceptDraw PRO diagramming and vector drawing software extended with the Electrical Engineering solution from the Engineering area of ConceptDraw Solution Park.

This example of bank ATM UML activity diagram was created on the base of UML use case diagram of automated teller machine from the course "Thinking in Java, 2nd edition, Revision 9" by Bruce Eckel published on the website of the Computer Science and Electrical Engineering Department of the University of Maryland, Baltimore (UMBC).
"If you are designing an auto-teller, for example, the use case for a particular aspect of the functionality of the system is able to describe what the auto-teller does in every possible situation. Each of these “situations” is referred to as a scenario, and a use case can be considered a collection of scenarios. You can think of a scenario as a question that starts with: “What does the system do if...?” For example, “What does the auto-teller do if a customer has just deposited a check within the last 24 hours, and there’s not enough in the account without the check having cleared to provide a desired withdrawal?”
Use case diagrams are intentionally simple to prevent you from getting bogged down in system implementation details prematurely...
Each stick person represents an “actor,” which is typically a human or some other kind of free agent. (These can even be other computer systems, as is the case with “ATM.”) The box represents the boundary of your system. The ellipses represent the use cases, which are descriptions of valuable work that can be performed with the system. The lines between the actors and the use cases represent the interactions.
It doesn’t matter how the system is actually implemented, as long as it looks like this to the user."
[csee.umbc.edu/ courses/ 331/ resources/ tij/ text/ TIJ213.gif]
This automated teller machine (ATM) UML use case diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the ATM UML Diagrams solution from the Software Development area of ConceptDraw Solution Park.

This interactive voice response (IVR) diagram sample shows the Voice over IP (VoIP) signalling protocol stack. It was designed on the base of the Wikimedia Commons file: Pvoip.gif. [commons.wikimedia.org/ wiki/ File:Pvoip.gif]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"A VoIP phone or IP phone uses Voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet, instead of the traditional public switched telephone network (PSTN).
Digital IP-based telephone service uses control protocols such as the Session Initiation Protocol (SIP), Skinny Client Control Protocol (SCCP) or various other proprietary protocols." [VoIP phone. Wikipedia]
The IVR diagram example "VoIP protocols" was designed using ConceptDraw PRO diagramming and vector drawing software extended with the Interactive Voice Response Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.