I decided I needed a gift for one of my nieces. I came across this pattern and just had to make it. I think it might be a little big for her yet but I had fun making it. The straps are lopsided in the picture but they're just tied that way. I learned a coup...
On this day, 21 February 1958, the peace symbol design was completed. It was commissioned by the British Campaign for Nuclear Disarmament. The three lines inside the circle represent the simplified semaphore letters "N" and "D", for Nuclear Disarmament.
Semaphore is the system of using flags to send information great distances, such as from one ship to another ship. "N" is formed by a person holding a flag in each hand and pointing it toward the ground at a 45-degree angle. "D" is formed by a person holding one flag straight down and one straight up.
Check out the 19 #NobelPeacePrizes awarded within the field of arms control and disarmament: http://goo.gl/QvDSf7
This March 18, 2015, view from the Mast Camera on NASA's Curiosity Mars rover shows a network of two-tone mineral veins at an area called "Garden City" on lower Mount Sharp.
Two-tone mineral veins at a site NASA's Curiosity rover has reached by climbing a layered Martian mountain offer clues about multiple episodes of fluid movement. These episodes occurred later than the wet environmental conditions that formed lake-bed deposits the rover examined at the mountain's base.
Curiosity has analyzed rock samples drilled from three targets lower on the mountain in the past seven months. It found a different mineral composition at each, including a silica mineral named cristobalite in the most recent sample. These differences, together with the prominent veins seen in images taken a little farther uphill, illustrate how the layers of Mount Sharp provide a record of different stages in the evolution of the area's ancient environment.
The two-tone veins are at the site called "Garden City." They appear as a network of ridges left standing above the now eroded-away bedrock in which they formed. Individual ridges range up to about 2.5 inches (6 centimeters) high and half that in width, and they bear both bright and dark material.
"Some of them look like ice-cream sandwiches: dark on both edges and white in the middle," said Linda Kah, a Curiosity science-team member at the University of Tennessee, Knoxville. "These materials tell us about secondary fluids that were transported through the region after the host rock formed."
Veins such as these form where fluids move through cracked rock and deposit minerals in the fractures, often affecting the chemistry of the rock surrounding the fractures. Curiosity has found bright veins composed of calcium sulfate at several previous locations. The dark material preserved here presents an opportunity to learn more. Kah said, "At least two secondary fluids have left evidence here. We want to understand the chemistry of the different fluids that were here and the sequence of events. How have later fluids affected the host rock?"
Some of the sequence is understood: Mud that formed lake-bed mudstones Curiosity examined near its 2012 landing site and after reaching Mount Sharp must have dried and hardened before the fractures formed. The dark material that lines the fracture walls reflects an earlier episode of fluid flow than the white, calcium-sulfate-rich veins do, although both flows occurred after the cracks formed.
Garden City is about 39 feet (12 meters) higher than the bottom edge of the "Pahrump Hills" outcrop of the bedrock forming the basal layer of Mount Sharp, at the center of Mars' Gale Crater. The Curiosity mission spent about six months examining the first 33 feet (10 meters) of elevation at Pahrump Hills, climbing from the lower edge to higher sections three times to vertically profile the rock structures and chemistry, and to select the best targets for drilling.
"We investigated Pahrump Hills the way a field geologist would, looking over the whole outcrop first to choose the best samples to collect, and it paid off," said David Blake of NASA's Ames Research Center, Moffett Field, California, principal investigator for the Chemistry and Mineralogy (CheMin) analytical laboratory instrument inside the rover.
Analysis is still preliminary, but the three drilled samples from Pahrump Hills have clear differences in mineral ingredients. The first, "Confidence Hills," had the most clay minerals and hematite, both of which commonly form under wet conditions. The second, "Mojave," had the most jarosite, an oxidized mineral containing iron and sulfur that forms in acidic conditions. The third is "Telegraph Peak." Examination of Garden City has not included drilling a sample.
Blake said, "Telegraph Peak has almost no evidence of clay minerals, the hematite is nearly gone and jarosite abundance is down. The big thing about this sample is the huge amount of cristobalite, at about 10 percent or more of the crystalline material." Cristobalite is a mineral form of silica. The sample also contains a small amount of quartz, another form of silica. Among the possibilities are that some process removed other ingredients, leaving an enrichment of silica behind; or that dissolved silica was delivered by fluid transport; or that the cristobalite formed elsewhere and was deposited with the original sediment.
NASA's Mars Science Laboratory Project is using Curiosity to examine environments that offered favorable conditions for microbial life on ancient Mars, if the planet ever has hosted microbes, and the changes from those environments to drier conditions that have prevailed on Mars for more than three billion years.
After investigations in the Telegraph Peak area, the rover team plans to drive Curiosity through a valley called "Artist's Drive" to reach higher layers. Engineers are meanwhile developing guidelines for best use of the rover's drill, following detection of a transient short circuit last month while using the tool's percussion action to shake rock powder into a sample-processing device. Drilling can use both rotary and percussion actions.
"We expect to use percussion as part of drilling in the future while we monitor whether shorts become more frequent," said Steve Lee of NASA's Jet Propulsion Laboratory, Pasadena, California. Lee became deputy project manager for the Mars Science Laboratory Project this month. He previously led the project's Guidance, Navigation and Control Team from design through landing.
JPL, a division of the California Institute of Technology in Pasadena, built the rover and manages the project for NASA's Science Mission Directorate in Washington. For more information about Curiosity, visit:
#NASA #Space #Astronomy #Mars #Science #Rover #Curiousity
#PahrumpHills #Mineral #Veins #Chemistry #Fluid #Engineering
#Technology #STEM #RedPlanet #Robotic #JPL
1) Selling blank pages.
That's right: some of their articles, costing $30 to access, consist solely of one blank page! You can see one here:
It's a paper called 'Verified synthesis of zeolitic materials'. Just a blank page.
When these pages were discovered, Elsevier deleted them. That's sort of weird in itself: deleting nothingness so people can't see it.
2) Exempting themselves from their own copyright agreements.
You can pay them to make your papers open-access. In return you get a Creative Commons copyright which says nobody can charge money for them.
But if you read the fine print, which is hidden somewhere else, you'll see that Elsevier excludes itself from this restriction!
This lets them charge money for open-access papers.
3) Letting editors publish hundreds of their own papers in journals they edit.
You may remember the case of a physicist who did this in the Elsevier journal Chaos, Solitons and Fractals.
But now a medical researcher named Johnny Matson has been caught publishing hundreds of his own papers in two Elsevier journals he edits: Research in Developmental Disabilities and Research in Autism Spectrum Disorders.
That means nobody can really trust these papers to have been properly refereed! And this matters more for autism than for theoretical physics. Nobody will get sick from a bad theory about fractal spacetime.
Check out the story here:
and join the Elsevier boycott if you haven't yet:
- Department of Geology, University of SaskatchewanGraduate Student, 2011 - present
- University of SaskatchewanMSc Candidate Geology, 2011 - present
- University of SaskatchewanBSc Geology, 2006 - 2009
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