Posts tagged interest
Feed bears and they will eat
Sep 23rd
Residents encouraged to secure trash and food sources to protect bears
Gris getting ready to eat Prom Queen.
The City of Boulder reminds residents that this is the time of year when bears are foraging for food, in preparation for their winter hibernation. It is important that residents take measures to deter bears by securing any potential food sources on their properties.
Bear-proofing food items and trash is the best way for residents to minimize the chances that bears will show interest in their property. Common bear attractants include garbage, compost, bird feeders, food from outdoor grills, pet food left outside and fruit from trees. The city recommends that residents store garbage and compost bins in a garage or shed until the morning of collection, or keep their waste in a bear-resistant trash container. Residents within the city limits of Boulder can contact Western Disposal at 303-444-2037 to purchase bear-resistant trash containers.
Really stupid idea
Bears that learn that people are a source of food are sometimes killed to keep the public safe. Over the past six years, five bears have been killed in the city because of nuisance behavior or a threat to public safety. Please do your part to ensure that bears are not unnecessarily attracted to your property.
If there is a bear in your backyard, the following tips are recommended:
Keep your distance. Back away slowly from the bear, ensuring it has a clear escape path;
Never run. Running may cause a bear to chase you;
Never approach a bear, or get in between a cub and its mother;
Never provide food to a bear. This teaches it to approach people for food;
Do not let the bear become comfortable around your home; and
Once you are safely inside, do your best to scare the bear away. Yell, clap your hands and make other loud noises to encourgage the bear to leave.
If the bear is threatening human safety, pets or destroying property, call the police at 911. Report past bear sightings and encounters at 303-441-3004.
The city is in the final stages of developing the Black Bear and Mountain Lion component of the Urban Wildlife Management Plan (UWMP) and has prepared a draft version for public input. To view the draft plan and submit feedback, visit www.boulderwildlifeplan.net. Feedback provided prior to Sept. 28 will be incorporated into the Oct. 18 memo for City Council’s consideration.
Commissioners to jiggle district boundaries?
Sep 12th
Boulder County, Colo. – The Board of County Commissioners is now considering a fifth proposed district boundary alignment for Boulder County.
Based on public feedback to the original four options, the commissioners directed staff to draw up an additional option for them to review before making a decision prior to the redistricting deadline of Sept. 30.
Option E is the latest option available for comment and was created according to the following guidelines:
• Keep communities of interest intact (for example, commissioners heard that Niwot and Gunbarrel prefer to be aligned together with east county communities).
• Use clear boundary lines.
• Allow for growth.
o Option E places more population (approx. 100,000) in District 1, which includes the city of Boulder, because it is expected to grow the least. Districts 2 and 3, which are expected to grow more, have populations of roughly 96,000 and 98,000, respectively.
The commissioners will consider all district options and make a final decision at a business meeting scheduled for 10:30 a.m. on Tuesday, Sep. 27, in the Commissioners’ Hearing Room.
Additional comments may be submitted to commissioners@bouldercounty.org.
Per state statue, County Commissioners’ districts must be revised after each federal census to assure roughly equal population per district. Boulder County is divided into three districts and one commissioner is elected from each district by the voters of the whole county.
UNEXPECTED ADHESION PROPERTIES OF GRAPHENE MAY LEAD TO NEW NANOTECHNOLOGY DEVICES
Aug 23rd
Graphene, considered the most exciting new material under study in the world of nanotechnology, just got even more interesting, according to a new study by a group of researchers at the University of Colorado Boulder.
The new findings — that graphene has surprisingly powerful adhesion qualities — are expected to help guide the development of graphene manufacturing and of graphene-based mechanical devices such as resonators and gas separation membranes, according to the CU-Boulder team. The experimentsshowed that the extreme flexibility of graphene allows it to conform to the topography of even the smoothest substrates.
Graphene consists of a single layer of carbon atoms chemically bonded in a hexagonal chicken wire lattice. Its unique atomic structure could some day replace silicon as the basis of electronic devices and integrated circuits because of its remarkable electrical, mechanical and thermal properties, said Assistant Professor Scott Bunch of the CU-Boulder mechanical engineering department and lead study author.
A paper on the subject was published online in the Aug. 14 issue of Nature Nanotechnology. Co-authors on the study included CU-Boulder graduate students Steven Koenig and NarasimhaBoddeti and Professor Martin Dunn of the mechanical engineering department.
“The real excitement for me is the possibility of creating new applications that exploit the remarkable flexibility and adhesive characteristics of graphene and devising unique experiments that can teach us more about the nanoscale properties of this amazing material,” Bunch said.
Not only does graphene have the highest electrical and thermal conductivity among all materials known, but this “wonder material” has been shown to be the thinnest, stiffest and strongest material in the world, as well as being impermeable to all standard gases. It’s newly discovered adhesion properties can now be added to the list of the material’s seemingly contradictory qualities, said Bunch.
The CU-Boulder team measured the adhesion energy of graphene sheets, ranging from one to five atomic layers, with a glass substrate, using a pressurized “blister test” to quantify the adhesion between graphene and glass plates.
Adhesion energy describes how “sticky” two things are when placed together. Scotch tape is one example of a material with high adhesion; the gecko lizard, which seemingly defies gravity by scaling up vertical walls using adhesion between its feet and the wall, is another. Adhesion also canplay a detrimental role, as in suspended micromechanical structures where adhesion can cause device failure or prolong the development of a technology, said Bunch.
The CU research, the first direct experimental measurements of the adhesion of graphene nanostructures, showed that so-called “van der Waals forces” — the sum of the attractive or repulsive forces between molecules — clamp the graphene samples to the substrates and also hold together the individual graphene sheets in multilayer samples.
The researchers found the adhesion energies between graphene and the glass substrate were several orders of magnitude larger than adhesion energies in typical micromechanical structures, an interaction they described as more liquid-like than solid-like, said Bunch.
The CU-Boulder study was funded primarily by the National Science Foundation and the Defense Advanced Research Projects Agency.
The importance of graphene in the scientific world was illustrated by the 2010 Nobel Prize in physics that honored two scientists at Manchester University in England, Andre K. Geim and Konstantin Novoselov, for producing, isolating, identifying and characterizing graphene.
There is interest in exploiting graphene’s incredible mechanical properties to create ultrathin membranes for energy-efficient separations such as those needed for natural gas processing or water purification, while graphene’s superior electrical properties promise to revolutionize the microelectronics industry, said Bunch.
In all of these applications, including any large-scale graphene manufacturing, the interaction that graphene has with a surface is of critical importance and a scientific understanding will help push the technology forward, he said.
