This report presents the results of wind-tunnel tests supported through the Solar Energy Research Institute (SERI) by the Office of Solar Thermal Technology of the US Department of Energy as part of the SERI research effort on innovative concentrators. As gravity loads on drive mechanisms are reduced through stretched-membrane technology, the wind-load contribution of the required drive capacity increases in percentage. Reduction of wind loads can provide economy in support structure and heliostat drive. Wind-tunnel tests have been directed at finding methods to reduce wind loads on heliostats. The tests investigated primarily the mean forces, moments, and the possibility of measuring fluctuating forces in anticipation of reducing those forces. A significant increase in ability to predict heliostat wind loads and their reduction within a heliostat field was achieved.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OU quarterback Jamelle Holieway beats the Colorado altitude with a breath of oxygen."

The Radiological Survey Activities (RASA) Group of the Health and Safety Research Division at Oak Ridge National Laboratory (ORNL) is an Inclusion Survey Contractor (ISC) for the Uranium Mill Tailings Remedial Action Program (UMTRAP). The purpose of the ISC is to survey designated sites potentially contaminated with radioactive material originating from the 24 inactive uranium mill sites and make recommendations as to whether the site should be included in or excluded from further consideration by UMTRAP. An important aspect of the program is a prompt and inexpensive estimation of Radium-226 (/sup 226/Ra) concentration in soil samples. A large sodium iodide (NaI) well crystal coupled to a multichannel analyzer is used to count soil samples. Count data are currently analyzed with an algorithm that utilizes three regions of interest (ROI). A lack of agreement was observed when samples were also analyzed with lithium-drifted germanium (GeLi) spectrometers. The average estimate of /sup 226/Ra obtained using the current algorithm was 19% greater than the GeLi determination. Some possible reasons for these differences were examined. In 8.5% of the samples, the relative concentration of Cesium-137 (/sup 137/Cs) was highly correlated to the extent of error. Using alternative analysis techniques, the error for /sup 226/Ra …

The Grand Junction Uranium Mill Tailings Remedial Action-Radiological Survey Activities Group (UMTRA-RASA) program employs a screening method in which external exposure rates are used to determine if a property contaminated with uranium mill tailings is eligible for remedial action. Portable NaI detectors are used by survey technicians to locate contaminated areas and determine exposure rates. The exposure rate is calculated using a regression equation derived from paired measurements made with a pressurized ionization chamber (PIC) and a NaI detector. During July of 1985 extensive measurements were taken using a PIC and a NaI scintillator with both analogue and digital readout for a wide range of exposure rates and at a variety of elevations. The surface soil was sampled at most of these locations and analyzed for /sup 226/Ra. The response of the NaI detectors was shown to be highly correlated to radiation level but not to /sup 226/Ra concentration or elevation.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Durango & Silverton Depot in Durango is a National Historical Landmark."

From summary: The USGS (U.S. Geological Survey) and the USBM (U.S. Bureau of Mines) studied 10,414 acres of the Bull Gulch (CO-070-430) Wilderness Study Area in Eagle County, Colorado. The area has identified, minable sand and gravel deposits; there are no other identified resources. It has moderate mineral resource potential for gypsum and anhydrite, and low potential for all metals, including uranium, coal, oil and gas, and geothermal resources.

Annual report of the Rio Grande Compact Commission describing goals and activities during their annual meeting and the previous year as well as tabular data and other statistics related to the management of the Rio Grande River.

Photograph of a duck swimming in a lake next to a wooden pole. A metal fence stretches across the bottom of the frame. [1989, Buena Vista, CO]

Photograph of a walkway behind a series of homes.

Photograph of four people walking down a busy town street and one woman leaning against a storefront.

Photograph of a reflection of a hanger and a car in a thrift store window.

Photograph of a greenhouse covered with overgrown ivies.

Photograph of a tree stump in the middle of a lawn.

Photograph of white clothes hanging on a clothesline in a backyard.

Photograph of a man wearing a baseball cap inside a thrift store.

Photograph of a fence circling a yard taken from behind a hole in a group of vines.

Photograph of a sidewalk through a neighborhood with the sun shining brightly on it.

Photograph of a ladder laying in front of an open boor in a backyard.

Photograph of eight mug shots of people, each cut in half and mirrored.

Photograph of a flash of light obscuring a teddy bear in a toy store.

Photograph of a man standing with his hands on his hips while staring down a street.

Photograph of a dark, blurry tree at the edge of a lake. More trees are visible on the horizon. [1986, Buena Vista, CO]

Photograph of a narrow staircase taken from the bottom of its steps. There is a concrete wall to the left of the stairs, and foliage lining a shorter wall to the right. [1986, Buena Vista, CO]

Photograph of Jane wearing a matching set of patterned pajamas and standing on the porch of a white house. There is a lake to her left bordered by a forest. [1986, Buena Vista, CO]