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An example of a homemade unit. The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four [1] or five [2] [3] HVAC particulate air filters that form a cube and a box fan to draw air through the filters.
A dry media reaction or solid-state reaction or solventless reaction is a chemical reaction performed in the absence of a solvent. [1] Dry media reactions have been developed in the wake of developments in microwave chemistry, and are a part of green chemistry. [2] The drive for the development of dry media reactions in chemistry is:
Philadelphia has shifted to an information technology and service-based economy. Philadelphia and the Delaware Valley are a biotechnology hub. [5] As of 2023, metropolitan Philadelphia had entered the ranks of the top five U.S. venture capital centers, facilitated by its proximity to New York City and its entrepreneurial and financial ...
Rosin (/ ˈ r ɒ z ɪ n /), also known as colophony or Greek pitch (Latin: pix graeca), is a resinous material obtained from pine trees and other plants, mostly conifers.The primary components of rosin are diterpenoids, i.e., C 20 carboxylic acids.
Serve as the disbursing agent for payments from the City Treasury by distribution of checks and electronic payments in the most modern, secure, effective, and efficient method. Maximize amount of cash available for investment after meeting daily cash requirements, thereby providing a source of revenue to support the city's financial commitments.
The PRA focuses on planning and developing balanced mixed-use communities to create thriving, well-served neighborhoods. As the public government agency charged with the redevelopment of the City of Philadelphia, the Philadelphia Redevelopment Authority provides the foundations that enable private investors to revitalize neighborhoods.
Nearly 66 years after the battered body of a young boy was found stuffed inside a cardboard box, Philadelphia police say they have finally unlocked a central mystery in the city’s most notorious ...
The tax equals $1.01 per pack of 20 of cigarettes. Federal excise tax revenue from tobacco products peaked in fiscal year 2010 at $17.2 billion after the increase in tobacco product tax rates in the Children's Health Insurance Program Reauthorization Act of 2009. This tax increase, which took effect in April 2009, was the most recent time ...