Using opus caementicium for salt water dams and beach fortifications and making an even superieur concrete for salt water marine concrete

1: Using Roman concrete/opus caementicium for salt water dams and beach fortifications.
-It's so resistant to salt water that it actually get's stronger from salt water
2: Making a superieur marine concrete.


By JK from Holland
12-04-2019

Making concretes with different levels of pH in the water and doing tests and experiments on those concretes

Doing durability tests on those conretes

Doing break tests on those concretes
Doing resistance tests on those concretes due to salt water and water with higher acidity levels

By Jef Koelewijn
From Holland
12-04-2019

Solving the non imperfect human skull

How to make the human skull non imperfect

How to make a human skull grow to a non imperfect form

An experiment for solar cells

Putting a voltage meter on a solar cell and then putting a colour of coloured gel
over it each time, going along all the colours.
And seeing and writing down how much it produces without a colour gel and with each
different colour gel.
And testing it on multiple kinds of photovoltaics like silicon and perovskite.

Important:
-The same amount of natural sunlight should shine onto it the whole time
 A meter that meters the amount of light should be next to it.

By Jef Koelewijn
Written on 03 and 04-04-2019

A device that can show all light wavelengts in a light source and the intensities

A device that shows all incoming light wavelength spectrums and intensities of the light
wavelengths of an incoming light source.

Written by Jef Koelewijn from South-Holland
On 03-04-2019

Light brightness meter and a light brightness scale

A light brightness meter

And a light brightness scale

Written by JK from South-Holland
On 03-04-2019