Resource Type

Kinetics of U(VI) reduction control kinetics of U(IV) reoxidation

For the in situ reductive immobilization of U to be an acceptable strategy for the removal of that element from groundwater, the long-term stability of U(IV) must be determined. Rates of biotransformation of Fe species influence the mineralogy of the resulting products (Fredrickson et al., 2003; Senko et al., 2005), and we hypothesize that the rate of U(VI) reduction influences the mineralogy of resultant U(IV) precipitates. We hypothesize that slower rates of U(VI) reduction will yield U(IV) phases that are more resistant to reoxidation, and will therefore be more stable upon cessation of electron donor addition. U(IV) phases formed by relatively slow reduction may be more crystalline or larger in comparison to their relatively rapidly-formed counterparts (Figure 1), thus limiting the reactivity of slowly-formed U(IV) phases toward various oxidants. The physical location of U(IV) precipitates relative to bacterial cells may also limit the reactivity of biogenic U(IV) phases. In this situation, we expect that precipitation of U(IV) within the bacterial cell may protect U(IV) from reoxidation by limiting physical contact between U(IV) and oxidants (Figure 1). We assessed the effect of U(VI) reduction rate on the subsequent reoxidation of biogenic U(IV) and are currently conducting column scale studies to determine …
Date: April 5, 2006
Creator: Senko, J.M.; Minyard, M.L.; Dempsey, B.A.; Roden, E.E.; Yeh, G.-T. & Burgos, W.D.
System: The UNT Digital Library

Testing the Concept of Drift Shadow Using X-Ray Absorption Imaging

None
Date: November 22, 2005
Creator: Forsberg, A. A.; Altman, S. J.; Peplinski, W. J. & Ho, C. K.
System: The UNT Digital Library

Anisotropic Flow in the Forward Directions

The STAR Forward TPCs (FTPCs) extend the STAR acceptance for charged particles into the region 2.5 < |eta| < 4.0. We see the first signal of directed flow (v{sub 1}) at RHIC energies. While v{sub 1} is consistent with zero in the central rapidity region it rises up to 2 percent at pseudorapidities of +-4. With this signal we can verify that elliptic flow (v{sub 2}) is in-plane. The measurement of v{sub 2} in the FTPCs confirms the falloff by a factor of about 2 compared to mid-rapidity previously seen by PHOBOS [1]. In addition we look for higher harmonics (v{sub n}, n>2) where in the case of v{sub 4} a signal is seen in the STAR TPC. With the available statistics for the FTPCs we give an upper limit for these harmonics, since the results agree with zero within the errors. However, the falloff of v{sub 4} from mid-rapidity to forward-rapidities appears to be faster than for v{sub 2}.[1] B.B. Back. Phys. Rev. Lett. 89, 222301 (2002)
Date: March 9, 2004
Creator: Oldenburg, Markus D. & Putschke, Jorn
System: The UNT Digital Library

Ecoregions of Texas [Poster]

Poster containing a map color-coded to "denote areas of general similarity in ecosystems and in the type, quality and quantity of environmental resources" with a key to regions and sub-regions in the lower-left corner along with a similar inset for the conterminous United States (scale 1:2,500,000). The poster also includes a list of the regions in Texas with descriptions and illustrative photographs to the right of the map, which is continued on the back. The back of the poster also includes a smaller version of the state map in the lower-left corner along with a list of common and scientific names of native plants and and wildlife, as well as a source list.
Date: 2004
Creator: Griffith, Glenn E.; Bryce, Sandra A.; Omernik, James M.; Comstock, Jeffrey A.; Rogers, Anne C.; Harrison, Bill et al.
System: The Portal to Texas History

A Dad...Teaches, Supports, Plays, Listens, Loves

Bilingual poster depicting a father hugging a child and reading "A Dad...Teaches, Supports, Plays, Listens, Loves," and "Thank you to the unsung heroes of children's lives...loving supportive parents." One side is in English and the other side is in Spanish.
Date: [2002..2015]
Creator: Texas. Department of Health.
System: The Portal to Texas History

Symbols of Service: Wear Them Proudly & Properly!

Poster which "represents in correct order of precedence, ribbons and devices most likely to be worn by members of today's Air Force" (top of poster), with an image and label for each.
Date: September 1985
Creator: United States. Department of the Air Force.
System: The UNT Digital Library

The Modernized Metric System: the International System of Units-SI

Revised wall chart of the seven base units of the modernized metric system, including length, mass, time, electric current, temperature, amount of substance, luminous intensity, and plane angle.
Date: August 1981
Creator: United States. National Bureau of Standards.
System: The UNT Digital Library

Binary Phase Diagrams of Transition Elements

Chart issued by the U.S. National Bureau of Standards illustrating the systematic relationships between phase diagrams of transition elements. This chart includes color illustrations.
Date: May 1980
Creator: Waterstrat, Richard M.
System: The UNT Digital Library

Recycling and the Consumer

This document contains consumer information regarding recycling in the United States.
Date: 1979
Creator: unknown
System: The UNT Digital Library

26 job opportunities in the United States Army Air Forces.

Folded brochure containing panels which can be folded out and used as posters. One side has photographs depicting 26 Army Air Force jobs. Another side has photographs of different types of military airplanes and depicts the jobs associated with flying and maintaining a B-17 airplane. On the reverse side are job descriptions and requirements.
Date: unknown
Creator: United States. Federal Security Agency.
System: The UNT Digital Library

All the ear-marks of a sneaky Jap! : don't discuss your job!

Black & white cartoon drawing of two men talking. One hushes the other, while pointing upward at a drawing of a human ear centered on a Japanese flag design. In the background is a large ship and a factory. Two flags fly over the factory: One with an "E" on it, and another with "RCA" on it.
Date: unknown
Creator: Alexander.
System: The UNT Digital Library

Are you 100% American? Prove it! Buy U.S. government bonds : Third Liberty Loan.

Poster is mainly black text with a red border. Centered at top is a design consisting of an eagle, U.S. flags, and cannons. Centered at the bottom is a blue shield with white text: "U.S. TREASURY WILL PAY INTEREST EVERY SIX MONTHS".
Date: unknown
Creator: Stern
System: The UNT Digital Library

Arms for Russia-- a great convoy of British ships escorted by Soviet fighter planes sails into Murmansk Harbour with vital supplies for the Red Army.

A view of the ocean and sky from the deck of a ship flying a British White Ensign (naval ensign) flag. There are other ships in the water and planes flying in the sky. Red Star emblems can be seen on some of the planes. One plane in the distance is crashing toward the ocean.
Date: unknown
Creator: Blake.
System: The UNT Digital Library

A battery of Britain's giant coastal-defence guns mounted on railway trucks.

Poster is a color drawing of a large military gun mounted on a train truck. The gun is being fired, and similar guns are seen firing in the distance. Small figures of soldiers can be seen covering their ears. The background is a brightly colored yellow and orange sky.
Date: unknown
Creator: Davies, Roland.
System: The UNT Digital Library

Battleships of the Royal Navy, steaming in line ahead.

Color poster of four battleships at sea. One appears closest at right, and three are in the background. Each ship has large guns or cannons that are firing. Three airplanes fly in the sky above the ships.
Date: unknown
Creator: Davies, Roland.
System: The UNT Digital Library

Big guns of a British battleship. Each gun fires a shell weighing nearly one ton.

Color drawing of the view from a ship deck, as large cannon-type guns are firing from the deck, over the sea.
Date: unknown
Creator: Davies, Roland.
System: The UNT Digital Library

A British anti-aircraft battery in action. More than 590 German raiders have been destroyed by anti-aircraft fire over Britain.

An image of soldiers firing large anti-aircraft guns into the sky.
Date: unknown
Creator: Gardner, James, 1907-1995.
System: The UNT Digital Library

A British "Blenheim" bomber of the Coastal Command aids a British destroyer in smashing a German submarine.

Poster is a pastel drawing of an aircraft bombing a submarine. A British ship is shown behind the bombed submarine, and other ships can be seen in the distance.
Date: unknown
Creator: unknown
System: The UNT Digital Library

British bombers have carried out over 1,600 raids on Germany (up to May, 1941)

Color poster is a stylized drawing of aircraft in battle. Four bomber planes are depicted in camouflage. A large explosion is shown at the upper left corner of the picture.
Date: unknown
Creator: unknown
System: The UNT Digital Library

A British short "Sunderland" flying boat patrolling the sea lanes.

A "flying boat" aircraft is shown flying over the sea. A ship can be seen in the water below.
Date: unknown
Creator: Davies, Roland.
System: The UNT Digital Library

British tanks hurled Italy out of Abyssinia, and in Libya completely wrecked Axis plans of conquest.

Color illustration of tanks driving across a desert. The ground and sky are depicted in yellow and orange tones.
Date: unknown
Creator: unknown
System: The UNT Digital Library

The Bugle Sounds : Enlist in the U.S. Army Now : Your Country Needs You.

Poster in red, white, and blue tones includes an illustration of a military airplane and a photograph of men driving armored vehicles.
Date: 194X
Creator: unknown
System: The UNT Digital Library

Catafighters.

A series of 5 cm. boxes with drawings and captions below in rows of 4 across and 6 down. Drawings are comic book style with text explanations written below each box. The banner at the top has "RN" and "RAF" printed on either side of the title. Poster has red, black, and blue printing on white background.
Date: unknown
Creator: British Information Services.
System: The UNT Digital Library

China carries on.

Color poster shows a Chinese soldier walking in a determined manner with a rifle in his hands. Behind him, a small Chinese child stands next to a covered corpse. The child wears a white tunic and pants and a green vest and is barefoot. In the background is a pagoda. Near the right edge of the poster are painted four Chinese characters in red. The characters roughly translate as "Unite Against the Enemy and Rebuild Our Nation."
Date: unknown
Creator: Baldridge, Cyrus Leroy, 1889-1977.
System: The UNT Digital Library