Abstract: The present invention refers to a Daytime Radiative Cooling Cementitious composite including an OPC binder in the form of grains, with an amount of Fe2O3 lower than 0.05% by weight with respect to the total weight of the OPC binder, wherein the grain size is below 25 ?m, water, wherein the weight ratio between water and the OPC binder is between 0.2 to 0.6, an addition in a proportion between 0.1% and 50% by weight with respect to the weight of the OPC binder and wherein the resulting DRCCC has a pore size below 6 ?m as defined by mercury intrusion porosimetry, that can optionally comprise micropatterns, and to its use in the construction industry, such as building construction, in civil works such as reservoirs, bridges, dams and sewers, in solar cell technology or in urban architectural design.

Abstract: Systems and methods for converting marine current into electrical energy are provided. Certain systems include a housing with an opening that is adjustable between an open position and a closed position and a plunger that is configurable between a porous state and a non-porous state. The plunger can be configured to translate about the housing in a first direction when the opening is in the open position and the plunger is in the non-porous state, and in the opposite direction when the opening is in the closed position and the plunger is in the porous state. Certain systems include an axis configured to rotate, decks extending radially from the axis, and a vane disposed between the decks. The vane can be configured to translate between a first end of the decks and a second end of the decks when the axis rotates one hundred and eighty degrees.

Abstract: Systems and methods for converting marine current into electrical energy are provided. Certain systems include a housing with an opening that is adjustable between an open position and a closed position and a plunger that is configurable between a porous state and a non-porous state. The plunger can be configured to translate about the housing in a first direction when the opening is in the open position and the plunger is in the non-porous state, and in the opposite direction when the opening is in the closed position and the plunger is in the porous state. Certain systems include an axis configured to rotate, decks extending radially from the axis, and a vane disposed between the decks. The vane can be configured to translate between a first end of the decks and a second end of the decks when the axis rotates one hundred and eighty degrees.