Sigma Expert Solutions (SES) was founded and created by Demetrius Siachames in 2018 to provide solutions to complex and interesting engineering challenges. SES was founded on the principle that engineers armed with the right skills, tools, and relentless curiosity will positively affect the world.


SES provides a wide range of services ranging from Project and Program Planning to Mechanical Designs. Whether you need a full risk and uncertainty analysis of a complex project or a mechanical design for your latest medical product, SES can help you be successful.

Newsletter (e-blog)

An engineer’s perspective on a variety of topics. A new topic is covered every month, so check it out! You can also get regular updates by following SES on Linked In. The three latest topics are below, but all past newsletters can be accessed by clicking the Archive button.

Edition 27

Testing? Analysis? Simulation?

Edition 26

Choosing and Working with Partners

Edition 25

The Power of Pretotyping

Internal Design Work

SES performs ongoing internal design work as part of its mission to explore and understand a wide variety of topics and industries. Products of this internal work are published as either Design Studies, White Papers, or Inventions. Ranging from concepts on how to make your next cup of coffee to solving the urban transport problem, there’s sure to be something that will be of interest!

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Explanation of Fields in the SMARRT form submission

Reference Scenario Inputs:

Number of People Infected – How many potential members of the gathering are infectious. The simulation starts when they enter (time=0).

Type of Activity – Impacts the number of particles spread as aerosols per respiration. More strenuous activities result in more viroid particles being released.

Air Changes per Hour – This is the air exchange rate with fresh air for the volume of air being breathed by the gathering. If you use forced air exchange, you can calculate the number of air changes per hour for your specific situation.

Space Floor Area and Ceiling Height – These are used to calculate the total space volume.

Duration Infectious Person is Present – This is how long the infectious person stays in the space after their initial entry. For the reference scenario, this defines the end of the simulation.

Gathering Scenario Inputs:

See the reference scenario for all inputs up to Time of space entry.

Time of space entry and exit – These values represent when you enter and leave the space referenced to the infectious person. For example, if you show up fifteen minutes late, but stay an hour after the end of a one hour party, the Duration Infectious Person is Present is 60 minutes, the Time of Space Entry 15 minutes, and the Time of Space Exit 120 minutes