X-ray polarimetry has seen a growing interest in recent years. Improvementsin detector technology and focusing X-ray optics now enable sensitiveastrophysical X-ray polarization measurements...These measurements will providenew insights into the processes at work in accreting black holes, the emissionof X-rays from neutron stars and magnetars, and the structure of AGN jets. X-Calibur is a balloon-borne hard X-ray scattering polarimeter. An X-ray mirrorwith a focal length of 8 m focuses X-rays onto the detector, which consists ofa plastic scattering element surrounded by Cadmium-Zinc-Telluride detectors,which absorb and record the scattered X-rays. Since X-rays preferentiallyscatter perpendicular to their polarization direction, the polarizationproperties of an X-ray beam can be inferred from the azimuthal distribution ofscattered X-rays. A close alignment of the X-ray focal spot with the center ofthe detector is required in order to reduce systematic uncertainties and tomaintain a high photon detection efficiency. This places stringent requirementson the mechanical and thermal stability of the telescope structure. During theflight on a stratospheric balloon, X-Calibur makes use of the WallopsArc-Second Pointer (WASP) to point the telescope at astrophysical sources. Inthis paper, we describe the design, construction, and test of the telescopestructure, as well as its performance during a 25-hour flight from Ft. Sumner,New Mexico. The carbon fiber-aluminum composite structure met the requirementsset by X-Calibur and its design can easily be adapted for other types ofexperiments, such as X-ray imaging or spectroscopic telescopes.(read more)
Gondola Shelving Units. Gondola Units are perfect for hardware, retail, grocery and convenient stores looking to maximize their display space. The slimline design of the Gondola Shelving Unit provides an upscale look and the textured, scratch-resistance materials of the Unit and shelves ensure the utmost reliability year after year. Singapore News - Two workers were rescued by the Singapore Civil Defence Force (SCDF) after their gondola tilted to one side - leaving them stranded 20 storeys above ground for almost an hour.
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Make a paper gondola, and display it in your room. In Venice, Italy, these boats are used just like we use taxis in the United States.
Follow the simple instructions below to create your own paper gondola -- and as they say in Italy, buon viaggio!
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Paper Gondola Craft
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What You'll Need:
Black construction paper
Gold fadeless or origami paper
Glitter
Construction paper
Scissors
Glue
Tape
Fold a piece of black construction paper in quarters. Then, with the open fold on the left, cut out the bow shape (see above illustration). Unfold the paper, then glue the ends together to create the bow and stern.
To create the beak, fold the gold paper in half, draw a design similar to the one shown, and cut it out. Glue it to one end of the gondola. Draw a decorative line with glue on the side of the boat, and sprinkle the glue with glitter.
To make the gondola stand, fold a 2 x 8-inch strip of construction paper in half. Cut a notch in the center that is 1-inch wide at the top and 1-inch deep. Tape the ends together and set your gondola into the notch.
Now you're ready to sail away into the Venetian sunset!
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Want more fun stuff to do with paper? Check out these pages for more cool paper crafts:
Paper Gondola Instructions
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