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Showing 46361 - 46380 of 82804 results
  • Semen Quality and Hormone Levels Among Radiofrequency Heater Operators
    Semen Quality and Hormone Levels Among Radiofrequency Heater Operators
    Conover, David L. ;
    Cox, Clinton
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Approximately 9,000,000 US workers are occupationally exposed to radiofrequency (RF) radiation; over 250,000 operate RF dielectric heaters. Our purpose was to determine whether male RF heater operators experience increased adverse reproductive effects reflected in reduced semen quality or altered hormone levels. We measured incident RF heater radia ...
    Public Domain
  • Load Behavior of Grouted Bolts in Sedimentary Rock
    Load Behavior of Grouted Bolts in Sedimentary Rock
    Signer, Stephen P.
    2000/10/01 | Mining Publications
    This paper presents an overview of laboratory and field tests on approximately 250 fully grouted roof bolts instrumented with strain gauges in order to study loading behavior. Laboratory work included pull tests, time-dependent tests and shear tests. The field tests were conducted in 14 different mines extracting different commodities. However, bec ...
    Public Domain
  • AsthmaLike Symptoms in Wood Product Plant Workers Exposed to Methylene Diphenyl Diisocyanate
    Asthma-Like Symptoms in Wood Product Plant Workers Exposed to Methylene Diphenyl Diisocyanate
    Husberg, Brad ;
    Lewis, Daniel M.
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Diisocyanates, a group of highly reactive chemicals, have frequently been associated with occupational asthma. We evaluated respiratory health in workers at a new wood products manufacturing plant that uses methylene diphenyl diisocyanate (MDI), and was designed and operated with a goal of minimizing worker exposures. Health surveys using standardi ...
    Public Domain
  • WorkRelated Injuries in Drywall Installation
    Work-Related Injuries in Drywall Installation
    Cameron W ;
    Dement, John M.
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Administrative data sources were used to describe the work-related injuries of drywall carpenters, to calculate rates of occurrence, and to explore high risk sub-groups. Health insurance eligibility files were used to identify a cohort of active union carpenters affiliated with a union local whose predominant work involved drywall installation in t ...
  • Automated Abrasive Blasting Equipment for Use on Steel Structures
    Automated Abrasive Blasting Equipment for Use on Steel Structures
    Dunn, Kevin H. ;
    Echt, Alan S.
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    This is the report of a project performed to determine the feasibility of using automated paint-removal technology on steel structures (ships, bridges, storage tanks, etc.). The major goal of the project was to determine the current status of the technology. This involved determining the number of prototypes currently available, the development sta ...
    Public Domain
  • Mine Shaft Conveyance Monitoring
    Mine Shaft Conveyance Monitoring
    Beus, Michael J. ;
    Iverson S
    2000/10/01 | Mining Publications
    Monitoring conveyance position and wire rope load directly from the skip or cage top offers several significant safety and production advantages. The Spokane Research Laboratory of the National Institute for Occupational Safety and Health (NIOSH) developed a shaft conveyance monitoring system (SCMS). This system consists of position and guide-displ ...
    Public Domain
  • Health and disability insurance
    Health and disability insurance.
    Park RM
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Employers with modern data systems and employee benefits programs can perform surveillance for occupational health problems. Although work-related health problems involving medical treatment for lost time should be handled by workers' compensation, experience suggests a large burden of work-related illness is actually processed through medical insu ...
    Public Domain
  • Ergonomics Ergonomics of Rebar Tying
    Ergonomics: Ergonomics of Rebar Tying
    Dababneh AJ ;
    Waters, Thomas R.
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Concrete is a versatile building material and concrete work is a major part of most construction projects, such as foundations, bridges, roads, and airport runways. In order to improve the strength characteristics of concrete, it is reinforced with iron bars. These iron bars are commonly known as rebar. Rebar rods are tied together and placed withi ...
    Public Domain
  • Skin Failure of Roof and Rib and Support Techniques in Underground Coal Mines
    Skin Failure of Roof and Rib and Support Techniques in Underground Coal Mines
    Bauer, Eric R. ;
    Dolinar, Dennis R.
    2000/10/01 | Mining Publications
    Skin failures of roof and rib in underground coal mines continue to be a significant safety hazard for mine workers. Skin failures do not usually involve failure of the support systems, but result from rock or coal spalling from between the support elements. For instance, in 1997 more than 800 miners were injured by roof and rib falls, of which 98% ...
    Public Domain
  • Temperature and Humidity Compensation in the Determination of Solvent Vapors with a Microsensor System
    Temperature and Humidity Compensation in the Determination of Solvent Vapors with a Microsensor System
    Park J ;
    Zellers ET
    2000/10/01 | National Institute for Occupational Safety and Health (NIOSH)
    Accounting for changes in temperature and ambient humidity is critical to the development of practical field vapor-monitoring instrumentation employing microfabricated sensor arrays. In this study, responses to six organic vapors were collected from two prototype field instruments over a range of ambient temperatures and relative humidities (RH). E ...
  • Information Circular 9453 Proceedings New Technology for Coal Mine Roof Support
    Information Circular 9453: Proceedings: New Technology for Coal Mine Roof Support
    Mark, Christopher ;
    Dolinar, Dennis R.
    2000/10/01 | Mining Publications
    Roof falls continue to be the greatest single safety hazard faced by underground coal miners. During 1996-99, 44 coal miners lost their lives in rock falls, and nearly 2,400 were injured. In addition, nearly 6,000 noninjury roof collapses were reported. Roof supports are installed to protect the miners, but support system failures contributed to mo ...
    Supporting Files Public Domain
  • Roof and Rib Fall Incidents and Statistics A Recent Profile
    Roof and Rib Fall Incidents and Statistics: A Recent Profile
    Pappas, Deno M. ;
    Bauer, Eric R.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :3-22 | National Institute for Occupational Safety and Health (NIOSH)
    During 1998-99, groundfall incidents resulted in 27 fatalities and were responsible for over 70% of all deaths in U.S. underground coal mines. To obtain a better understanding of where and why these incidents occurred, a comprehensive analysis of groundfall injuries and fatalities was conducted. The first portion of the study examined various facto ...
    Public Domain
  • Skin Failure of Roof and Rib and Support Techniques in Underground Coal Mines
    Skin Failure of Roof and Rib and Support Techniques in Underground Coal Mines
    Bauer, Eric R. ;
    Dolinar, Dennis R.
    2000/10/01 | Proceedings of the 18th International Conference on Ground Control in Mining, August 2-5, 1999, Morgantown, West Virginia. Peng SS, Mark C, eds., Morgantown, WV: West Virginia University, 1999 Aug; :108-114 | National Institute for Occupational Safety and Health (NIOSH)
    Skin failures of roof and rib in underground coal mines continue to be a significant safety hazard for mine workers. Skin failures do not usually involve failure of the support systems, but result from rock or coal spalling from between the support elements. For instance, in 1997 more than 800 miners were injured by roof and rib falls, of which 98% ...
    Public Domain
  • Fundamentals of Coal Mine Roof Support 2000
    Fundamentals of Coal Mine Roof Support [2000]
    Mark, Christopher ;
    Barczak, Thomas M.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :23-42 | National Institute for Occupational Safety and Health (NIOSH)
    Roof supports can only be understood in conjunction with the rock structure that they support. The strength of the rock depends on geology, and the loads are applied primarily by the in situ and mining-induced stresses. Other factors, such as wider spans and retreat of multiple-seam mining, can also reduce the stability of mine openings. Roof suppo ...
    Public Domain
  • Assessing Coal Mine Roof Stability Through Roof Fall Analysis 2000
    Assessing Coal Mine Roof Stability Through Roof Fall Analysis [2000]
    Molinda, Gregory M. ;
    Mark, Christopher
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :53-72 | National Institute for Occupational Safety and Health (NIOSH)
    In 1999, 2,087 unplanned roof falls were reported from 841 mines. Nearly 55% of all mines reported at least one roof fall, and nearly 17% of the mines reported five or more falls. In order to investigate the variables that contribute to roof falls, the National Institute for Occupational Safety and Health (NIOSH) compiled a national database of roo ...
    Public Domain
  • Trends in Roof Bolt Application 2000
    Trends in Roof Bolt Application [2000]
    Dolinar, Dennis R. ;
    Bhatt, Suresh K.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :43-51 | National Institute for Occupational Safety and Health (NIOSH)
    The roof bolt system of a mine, if properly selected and installed, can allow for better roof control and reduce the potential for roof falls. Because of this potential to reduce roof falls and improve ground control conditions, the National Institute for Occupational Safety and Health (NIOSH) has an interest in the types of roof bolts that are use ...
    Public Domain
  • Load Behavior of Grouted Bolts in Sedimentary Rock 2000
    Load Behavior of Grouted Bolts in Sedimentary Rock [2000]
    Signer, Stephen P.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :73-80 | National Institute for Occupational Safety and Health (NIOSH)
    This paper presents an overview of laboratory and field tests on approximately 250 fully grouted roof bolts instrumented with strain gauges in order to study loading behavior. Laboratory work included pull tests, time-dependent tests and shear tests. The field tests were conducted in 14 different mines extracting different commodities. However, bec ...
    Public Domain
  • Examining Longwall Shield Failures from an Engineering Design and Operational Perspective
    Examining Longwall Shield Failures from an Engineering Design and Operational Perspective
    Barczak, Thomas M.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :223-245 | National Institute for Occupational Safety and Health (NIOSH)
    Longwall operators are again pushing the envelope in terms of life expectancy for longwall shields. State-of-the-art shields are now expected to last more than 60,000 loading cycles, twice the life expectancy compared with those of a decade ago. A review of trends in shield design shows that shields continue to increase in both size and capacity. S ...
    Public Domain
  • Instruments for Monitoring Stability of Underground Openings 2000
    Instruments for Monitoring Stability of Underground Openings [2000]
    Larson, Mark K. ;
    Tesarik, Douglas R.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :253-269 | National Institute for Occupational Safety and Health (NIOSH)
    For several years, researchers from the Spokane Research Laboratory of the National Institute for Occupational Safety and Health (NIOSH) have been using geotechnical instruments in underground mines to study ground control problems and develop means of reducing accidents and fatalities caused by ground falls. This paper describes many of the differ ...
    Public Domain
  • Cable Support in Longwall Gate Roads 2000
    Cable Support in Longwall Gate Roads [2000]
    Dolinar, Dennis R. ;
    Martin, Lewis A.
    2000/10/01 | Proceedings: new technology for coal mine roof support. Mark C, Dolinar DR, Tuchman RJ, Barczak TM, Signer SP, Wopat PF, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2000-151; (IC 9453), 2000 Oct; :165-191 | National Institute for Occupational Safety and Health (NIOSH)
    Cable bolt technology used by the U.S. coal industry was developed to a large extent in the 1990s. Today, these cable systems include both cable bolts and cable trusses to provide supplemental and secondary support in gate roads. This cable technology is significantly different than the cable systems in use in either U.S. hardrock mines or Australi ...
    Public Domain
46361 - 46380 / 82804