UCR’s Area Environmental Horticulturist Dennis Pittenger’s Book Gains Acclaim

Dennis Pittenger

Dennis Pittenger

Dennis Pittenger, cooperative extension area environmental horticulturist, recently edited the second edition of the book, California Master Gardener Handbook. Pittenger was the editor of the first edition (2002) as well.

Released in January 2015, California Master Gardener Handbook gives readers information on topics such as pest control, plant physiology and water management. The second edition includes new sections on creating and maintaining landscapes for fire protection and invasive plants.

Dennis Pittenger’s book has been featured on the front page of the Press-Enterprise newspaper and is selected as a 2015 Extension Education Materials Award winner by the American Society for Horticultural Science (ASHS).

Water Experts to Discuss Impact of State Drought Restrictions on Inland Area May 27

Cantu, Grindstaff, Headrick, Rossi

Water experts (clockwise, from top left) Celeste Cantu, Joe Grindstaff, John Rossi and Doug Headrick will address the impact of new water restrictions on May 27.

A panel of regional water experts will discuss California’s historic drought and the impact of state-imposed conservation regulations on Inland residents, businesses and communities on Wednesday, May 27, from 5:30 to 7:30 p.m.

“Water: Impact of the Drought and New Regulations on Inland Southern California” is part of the ongoing Randall Lewis Seminar Series of the Center for Sustainable Suburban Development (CSSD). It is free and open to the public, and will be held at the UCR College of Engineering-Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Ave., Riverside. Reservations are requested as seating is limited and may be made online or by calling (951) 827-7830.

Ron Loveridge, CSSD director and associate professor of political science, will moderate the discussion.

Panelists include: Celeste Cantú, general manager of Santa Ana Watershed Project Authority; Joe Grindstaff, general manager of Inland Empire Utilities Agency; Doug Headrick, general manager/chief engineer of San Bernardino Valley Municipal Water District; John Rossi, general manager of Western Municipal Water District.

Read more at: http://ucrtoday.ucr.edu/29183.

UCR Physicists Report on Positronium

Positronium (Ps) is an exotic hydrogen-like atom, composed of a bound positron-electron pair. In its ground state the atom is unstable and short-lived, annihilating into high-energy photons known as gamma rays.

Physicists at UC Riverside have discovered that Ps formed in metal-organic frameworks (MOFs) is emitted from the surface with narrowly defined energies. MOFs are a group of synthetic crystals that are highly porous, have large surface area to volume ratios, and form self-assembled crystals.

Reporting in a research paper published April 17, 2015 in Physical Review Letters, Allen Mills, a professor of physics and astronomy, and colleagues report that the production mechanism for Ps  in MOFs offers the possibility that a MOF target may be tailored to produce very slow sub-thermal Ps.

“The emission of Ps from a dense collection of millions of Ps atoms in a MOF crystal could be used to produce a Ps atom laser beam, via stimulated emission of Ps into the vacuum,” said Adric C. L. Jones, a postdoctoral scholar working with Mills and the first author of the paper.

The new result represents a further step towards the UCR positron lab’s goal of producing a Ps Bose-Einstein condensate (BEC) – a collection of Ps atoms that are in the same quantum state – which, Jones explained, is a precursor to producing a gamma-ray laser.

Mills and Jones were joined in the research by the following researchers at UCR: Harris J. Goldman, Quanguo Zhai, Pingyun Feng, and Harry W. K. Tom. The work was supported in part by the US National Science Foundation and the US Department of Energy.

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