• Quarterly Report 1: Progress on Evaluation of WTC7 Collapse

      Hulsey, J. Leroy; Xiao, Feng; Quan, Zhili (2015-10)
    • Quarterly Report 2: Progress on Evaluation of WTC7 Collapse

      Hulsey, J. Leroy; Xiao, Feng; Quan, Zhili (2016-03)
    • Quarterly Report 3: Progress on Evaluation of WTC7 Collapse

      Hulsey, J. Leroy; Xiao, Feng; Quan, Zhili (2016-11)
    • Radon Concentrations in Public Facilities in Alaska

      Leonard, Shelby J.; Hawkins, Daniel B.; Tilsworth, Timothy (1987-07)
      Radon levels were measured in forty public facilities throughout Alaska. Test buildings consisted mainly of schools, DOT/PF maintenance garages, and office buildings. The project had two general goals: 1) To determine whether areas of potentially high indoor radon levels can be identified based on knowledge of the bedrock geology in the area, and 2) to determine if there is cause for concern regarding radon levels in public facilities in Alaska. Radon levels measured ranged from 0.0 to 5.2 pCi/l with a mean value of 0.6 pCi/l. No conclusive evidence was found correlating radon concentration with the geology of an area. The data suggest no urgency regarding radon levels in public facilities in Alaska, especially where mechanical ventilation and positive building pressure influence the dispersion of concentrations. However, the small size of the sample and the fact that most of the buildings sampled were mechanically ventilated does not rule out the possibility that higher radon levels may yet be found.
    • Radon Survey in the Hills Surrounding Fairbanks, Alaska

      Hawkins, Daniel B.; Leonard, Shelby J. (1987-08)
    • Report Supplement: Thermal and Cost Analysis of Thermal Envelopes for a Small Rural School

      Zarling, John; Strandberg, James S.; Maynard and Partch; HMS, Inc. (1983-01)
    • Retrofit Design of Drainage Structures for Improved Fish Passage: Literature Review

      Blevins, Vanessa; Carlson, Robert F. (1988-06)
      This report reviews existing literature on issues relevant to retrofitting culverts to mitigate fish passage barriers. The analysis of this information will set the stage for future laboratory experimentation on various retrofitting techniques. The topics in this report include a review of fish swimming capabilities, hydrologic factors involved in choosing a design flow, fish passage problems resulting from conventional culvert design, and potential retrofit solutions to these problems.
    • Review of Power Sources for Alaska DOT&PF Road Weather Information Systems (RWIS): Phase I

      Wies, Richard (2014-08)
      This report documents the findings related to a review of power sources for six off-grid Road Weather Information Systems (RWIS) in Alaska. Various power sources were reviewed as a means of reliably operating the off-grid RWIS sites throughout the year. Based on information collected on current power sources and equipment used at the off-grid RWIS sites, and visits to off-grid installations in Alaska, some viable methods of reliable operation were discovered. Power sources included in the study were solar photovoltaics (PV), small wind turbines, fuel cells, and thermoelectric generators, all charging a battery bank which powers the weather sensors, cameras, and communication equipment. The results showed that while solar PV provides enough standalone power to keep the sites operational from early spring to late fall with wind supplementing this somewhat during the transition seasons, a fossil fuel based source is necessary to maintain operation through the winter. These findings suggest that a combination of power sources is required for reliable RWIS operation throughout the year and is dependent on the location of the site.
    • Rural Alaska Electric Power Quality

      Aspnes, J.D. (1984-03)
      Poor quality electric power has traditionally been blamed for electrical and electronic equipment malfunctions and failures in rural Alaskan communities. This report presents results of a recently completed project in which power system disturbance analyzers provide the first comprehensive power quality data from Alaskan villages. Power systems of four widely separated communities were studied for a total of 1,010 days. These results are important because of the trend in rural Alaska toward more sophisticated equipment that is sensitive to power system disturbances. These data represent a first step in developing appropriate countermeasures to protect electrical systems connected to isolated rural 60 Hz power generator facilities
    • Rural Electric Power Quality Analysis Data Base Development

      Aspnes, J.; Merritt, R.; Spell, B.D.; Woodruff, K.; Alden, D.; Mulligan, G. (1987-03)
      The actual cost of poor quality electric power is difficult to accurately determine. Such cost information is important in determining the extent to which power quality enhancement techniques should be applied. This report presents data compiled to help determine the quantity and type of electrical and electronic equipment at risk in rural Alaska and the repair frequency of this equipment. Cost attributable to poor electric power quality are identified. Methods of electric power quality improvement and their relative costs are presented.
    • Rural Facility Electric Power Quality Analysis

      Aspnes, J.D.; Zhao, Y. Q.; Spell, B.D.; Merrit, R.P. (1991-03)
      This report gives results of a recently completed data collection and analysis project investigating electric power quality of two isolated utility systems in Alaska. This is the second phase of a similar effort reported in 1984 which provided the first comprehensive power quality data from four small Alaskan communities. In this report, second generation instrumentation is described and comprehensive data and data analyses are presented. These data are important because of the increased use throughout Alaska of electrical and electronic equipment that may be damage by power system disturbances.
    • Rural Facility Electric Power Quality Enhancement

      Wilson, M.; Aspnes, J.D.; Merritt, R.P.; Spell, B.D. (1991-05)
      Electric power disturbances are known to be more prevalent in small, isolated power systems than in larger interconnected grids which service most of the United States. This fact has given rise to a growing concern about the relative merits of different types of power conditioning equipment and their effectiveness in protecting sensitive electronics and essential loads in rural Alaska. A study has been conducted which compares isolation transformers, voltage regulators, power conditioners, uninterruptible power supplies and indoor computer surge suppressors in their ability to suppress the various disturbances which have been measured in several Alaskan communities. These include voltage sags and surges, impulses, blackouts, frequency variations and long-term voltage abnormalities. In addition, the devices were also subjected to fast, high-magnitude impulses such as might be expected in the event of a lightning strike to or near utility distribution equipment. The solutions for power line problems will vary for different load applications and for different rural electrical environments. The information presented in this report should prove to be valuable in making the analysis.
    • Safety Data Management: Gathering and Using the Data

      Perkins, Robert A; Bennett, F. Lawrence (2016-07-14)
      How are roadway crash data acquired, stored, and utilized in engineering and management decisions regarding highway projects? This research answers that question by interviewing the engineers and professionals involved with that safety data management from six states and asking – How are safety (crash) data acquired and used in their states. Since most safety projects are funded by the federal FHWA, through the HSIP, the general flow of the safety data is similar in the states interviewed. But there are many differences in details, especially the computer hardware and software. The methods of data movement between the responder and the DOT often involve an intermediate agency, often the DMV – this varies between the states. Likewise, the program to extract these data for the DOT varies. Another pronounced difference is the transfer of HSIP funding to local agencies. Also pronounced is the use of historical crash data in the SPFs. The older method of only looking at the crash data from the location in question is not uncommon, while the more modern method of using data from similar locations via an EB analysis is becoming more common and is the currently recommended method. Most analysis software is geared to the EB analysis. Historical crash data, before and after countermeasures are installed, may be used to evaluate SPF and CMF for particular states and localities, but there are practical problems with this application of crash data, due to the time required to acquire adequate data for comparisons.
    • Solar Assisted Culvert Thawing Device Phase I

      Zarling, John P. (1981-11)
      A solar assisted culvert thawing device has been designed, constructed, and installed as an alternate method for the prevention and control of roadway flooding and icing. The proposed solar thawing device is a maintenance-free system and relieves the labor-intensive and expensive culvert thawing methods presently used
    • Solar Assisted Culvert Thawing Device Phase II

      Zarling, John P.; Murray, Douglas H. (1983-05)
      A reflective type concentrating solar collector system has been designed, constructed and installed on an ice plugged roadway culvert as a means of melting a channel for water flow. The system consisted of four reflecting collectors, a circulating pump, and a thaw pipe mounted in the culvert. Photovoltaic panels were used as the source of power for the pump. A design analysis and performance characteristics are given for the solar collectors, circulating pump, and photovoltaic panels.
    • A Solar Design Manual for Alaska

      Seifert, Richard D. (1981-07)
    • Thermal Properties of Metal Stud Walls

      Zarling, John P.; Braley, W. Alan; Strandberg, James S.; Bell, Scott V. (1984-07)
    • Thermosyphon Devices and Slab-on-Grade Foundation Design

      Zarling, John P.; Haynes, F. Donald (1985-06)
      Subgrade cooling methods to prevent thermal degradation of permafrost in cold regions include the use of thermosyphons with inclined evaporator sections. This laboratory study was conducted to determine the thermal performance characteristics of two commercially available thermosyphons. Evaporator inclination angles ranged from 0(degrees) to 12(degrees) from the horizontal, and air speeds ranged from 0 to 13.4 miles per hour over the finned condenser sections. Two standard full size thermosyphons, one charged with CO2, carbon dioxide and the other with NH3, anhydrous ammonia, were tested in CRREL's atmospheric wind tunnel. Empirical expressions are presented for heat removal rates as a function of air speed, ambient air temperature and evaporator inclination angle. An analytical method is also presented to approximate thermal design of foundations using thermosyphons under buildings with a slab-on-grade. We present heat gains from the slab and pad to the thermosyphon as well as the evaporator temperature as functions of time.