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"The proton–proton chain reaction is one of several fusion reactions by which stars convert hydrogen to helium, the primary alternative being the CNO cycle. The proton–proton chain dominates in stars the size of the Sun or smaller.
In general, proton–proton fusion can occur only if the temperature (i.e. kinetic energy) of the protons is high enough to overcome their mutual electrostatic or Coulomb repulsion.
In the Sun, deuterium-producing events are so rare (diprotons, the much more common result of nuclear reactions within the star, immediately decay back into two protons) that a complete conversion of the star's hydrogen would take more than 1010 (ten billion) years at the prevailing conditions of its core. The fact that the Sun is still shining is due to the slow nature of this reaction; if it went more quickly, the Sun would have exhausted its hydrogen long ago." [Proton–proton chain reaction. Wikipedia]
The nuclear reaction diagram example "Proton-proton chain reaction" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Physics solution from the Science and Education area of ConceptDraw Solution Park.
Proton-proton chain reaction diagram
Proton-proton chain reaction diagram, positron, gamma particle, electron neutrino,
Used Solutions

physics symbols, physics diagrams Physics

physics symbols, physics diagrams
Physics solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for drawing the physical illustrations, diagrams and charts.

Physics Symbols

Physics Symbols
ConceptDraw PRO diagramming and vector drawing software extended with Physics solution from the Science and Education area is a powerful software for creating various physics diagrams. Physics solution provides all tools that you can need for physics diagrams designing. It includes 3 libraries with predesigned vector physics symbols: Optics Library, Mechanics Library and Nuclear Physics Library.

Cross-Functional Flowchart

Cross-Functional Flowchart. flowchart maker
Use of Cross-Functional Flowchart is a clear way of showing each team member’s responsibilities and how processes get shared or transferred between different responsible people, teams and departments. Use the best flowchart maker ConceptDraw PRO with a range of standardized cross-functional flowchart symbols to create the Cross-Functional Flowcharts simply and to visualize the relationship between a business process and the functional units responsible for that process. To draw the most quickly Cross-Functional Flowcharts, Cross Functional Process Maps, or Cross Functional Process Flow Diagrams, start with a Cross-functional flowchart samples and templates from ConceptDraw Solution Park. The ConceptDraw Arrows10 and RapidDraw technologies will be also useful for you in drawing. ConceptDraw PRO supports designing both types - horizontal and vertical Cross-functional flowcharts. A vertical layout makes the accents mainly on the functional units while a horizontal layout - on the process. If you need a Visio alternative in Mac OS X, try ConceptDraw PRO. Its interface is very intuitive and it’s actually much easier to use than Visio, yet somehow it’s just as powerful if not more so. ConceptDraw PRO performs professional quality work and seamless Visio interaction.
How to Draw a Cross Functional Flowchart using visio alternative ConceptDraw PRO as visio for mac
How to Draw a Cross Functional Flowchart using visio alternative ConceptDraw PRO as visio for mac

chemical drawings, chemistry equation symbols, chemical drawing software Chemistry

chemical drawings, chemistry equation symbols, chemical drawing software
This solution extends ConceptDraw PRO software with samples, template and libraries of vector stencils for drawing the Chemistry Illustrations for science and education.

biological image, biology drawing, biology symbols Biology

biological image, biology drawing, biology symbols
Biology solution extends ConceptDraw PRO software with samples, templates and libraries containing biological vector symbols, to help you create scientific and educational designs in the field of biology.

Network Community Structure. Computer and Network Examples

Network Community Structure. Computer and Network Examples
Network community structure is a network which nodes can be easily grouped into the sets of nodes with dense internally connections. This example shows a network that displays the community structure with three groups of nodes with dense internal connections and sparser connections between the groups.

Venn diagram, draw logical relations Venn Diagrams

Venn diagram, draw logical relations
Venn Diagrams are actively used to illustrate simple set relationships in set theory and probability theory, logic and statistics, mathematics and computer science, linguistics, sociology, and marketing. Venn Diagrams are also often used to visually summarize the status and future viability of a project.

Biology Drawing Software

Biology Drawing Software
Biology is incredibly interesting and useful natural science which studies all living things on the earth (people, animals, plants), structure, functions, interactions, evolution of living organisms. Biologists of the whole world use actively illustrations and drawings in your science and education activity. To facilitate their task of biology drawing, ConceptDraw PRO diagramming and vector drawing software was extended with Biology solution from the Science and Education area. Now, ConceptDraw PRO is a powerful biology drawing software.