We engage the Portland, Oregon scientific and technical community to enhance the health of the scientific research enterprise, provide opportunities for the next generation of scientists and engineers, and promote the public's understanding of science and technology. We are comprised of faculty and students from several colleges and universities in the Portland area, as well as colleagues in local business, industry, federal and state agencies, and medical centers. We focus many of our programs on enhancing the experiences of students at all levels. Many of our members are retired scientists and engineers who have relocated to the Portland area and find a community of interests through the activities of the chapter.

Andrea Bertozzi
Sigma Xi Distinguished Lecturer
Professor of Mathematics, UCLA

Thursday, 04 February, 2016, 7:30 pm
Smith Memorial Union, Room 294
Portland State University

Parking free after 7 pm in Structures 1 and 2 | campus map
TriMet access via MAX Green/Yellow/Orange Lines and Portland Streetcar
The lecture is free and open to the public.

Law enforcement agencies across the country have discovered that partnering with a team of mathematicians and social scientists from UCLA can help them determine where crime is likely to occur. The UCLA team developed a “predictive policing” computer program that zeros-in on areas that have the highest probability of crime. The use of mathematics in studying gang crimes and other criminal activities is studied. Use of the "predictive-policing" program allows communities to put police officers in the right place at the right time, stopping crime before it happens.

Dr. Bertozzi will also present a seminarGeometric graph-based methods for high dimensional datahosted by PSU's Department of Mathematics, on Friday 05 February at 3:15 pm, in Neuberger Hall 454.

Darwin Day celebration hosted by Biological Investigations and Outreach
Friday 12 Feb 2016, 5:30pm, Smith Ballroom, Portland State University
Speaker: Dr. Kiki Sanford, a neurophysiologist and curator for the "This Week in Science" radio program, on Endless, Beautiful, Wonderful Evolution.

The Oregon Academy of Science annual meeting is at Pacific University on 27 February 2016.

The next deadline for submission of student research proposals for Sigma Xi Grants-In-Aid of Research is 15 March 2016

Sigma Xi's international Science Research Showcase is now open for registration. We encourage our local students to present their research projects at this online event. Viewing and judging will take place March 28–April 3, 2016.

We invite first-place winners in our November 2015 Student Research Symposium to apply for partial travel support from this Chapter to present their research at the 14-17 June Annual Western Meeting in San Diego. The meeting is sponsored jointly by the Pacific Division of AAAS and the NW and SW Regions of Sigma Xi.

Local students won Sigma Xi Grants-In-Aid of Research in the October 2015 competition:

Caitlin Maraist, Ecology, Portland State University: Effects of Endophytic Fungi on Sexual Effort and Chemical Cues of the Dioecious Moss, Ceratodon Purpureus.

Jess Millar, Cell Biology/Biochemistry, Portland State University: Horizontally acquired tRNA facilitates adaptation to an extreme environment.

Joseph Thiebes won the award for best poster by an undergraduate in Chemistry at the Sigma Xi Annual Meeting and Student Research Conference, Kansas City MO, in October 2015, for his presentation on Prussian Green: a high rate capacity cathode for potassium ion batteries. He's an undergraduate in Chemistry and Physics at Portland State University.

Jim O'Connor
Research Geologist, U.S. Geological Survey 
Sigma Xi Distinguished Lecturer

Tuesday, April 5, 2016, 7:30 pm
Smith Memorial Union Room 294, Portland State University

Parking free after 7 pm in Structures 1 and 2 | campus map
TriMet access via MAX Green/Yellow/Orange Lines and Portland Streetcar
The lecture is free and open to the public.

Forty years ago, the demolition of large dams was mostly fiction, notably plotted in Edward Abbey's novel The Monkey Wrench Gang. Its 1975 publication roughly coincided with the end of large-dam construction in the United States. Since then, dams have been taken down in increasing numbers as they have filled with sediment, become unsafe or inefficient, or otherwise outlived their usefulness. Last year's removals of the 64-m-high Glines Canyon Dam and the 32-m-high Elwha Dam in northwestern Washington State were among the largest yet, releasing over 10 million cubic meters of stored sediment. From these removals we are beginning to learn how rivers and ecosystems respond. Many removals have produced surprises, but a common finding is that rivers are resilient, with physical conditions such as sediment load and channel shape quickly reverting to conditions similar to that before impoundment. Understanding of ecological consequences lags behind, mainly because of the longer time-frames intrinsic to adjusting ecosystems, but this knowledge will too improve as more dams continue to come down.


Tom Hard,
Aug 24, 2015, 2:00 PM