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Betacel is considered to be the first commercially successful betavoltaic battery. [1] [2] [3] It was developed in the early 1970s by Larry C. Olsen at the American corporation McDonnell Douglas, using the radioisotope Promethium-147 as the beta-electron source coupled to silicon semiconductor cells.
Betavolt claims it to be the first such miniaturised device ever developed. [14] It gains its energy from a sheet of nickel-63 located in a module the size of a very small coin. [12] [14] The isotope decays into stable, non-radioactive Cu-63, which pose no additional environmental threat.
Water meter in Belo Horizonte. Displacement meters are commonly referred to as Positive Displacement, or "PD" meters. Two common types are oscillating piston meters and nutating disk meters. Either method relies on the water to physically displace the moving measuring element in direct proportion to the amount of water that passes through the ...
However, smart investment in water involves more than just buying shares in utilities and. As pressures on our planet's water supply mount, investors are increasingly pouring money into solutions ...
By Robert Ross This might surprise you, but water is a fantastic investment. Take water utility stocks like American Water Works (AWK) and Consolidated Water Co. (CWCO), for example. In the past ...
Invest in this precious resource. Increasing droughts and floods in recent years have led to disparities in access to water, causing concern to investors who are diversifying their portfolios with ...
The term smart meter often refers to an electricity meter, but it also may mean a device measuring natural gas, water or district heating consumption. [1] [2] More generally, a smart meter is an electronic device that records information such as consumption of electric energy, voltage levels, current, and power factor.
A typical residential water meter A typical residential digital electric submeter Before submetering, many landlords either included the utility cost in the bulk price of the rent or lease , or divided the utility usage among the tenants in some way such as equally, by square footage via allocation methods often called RUBS (Ratio Utility ...