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Showing 1361 - 1380 of 83319 results
  • Investigating the Energy Balance of Two Mining Methods Set in a Deep Underground Metal Mine in the US
    Investigating the Energy Balance of Two Mining Methods Set in a Deep Underground Metal Mine in the U.S
    Armatys M ;
    Emery TM
    2024/06/23 | Mining Publications
    Hecla Mining Company (Hecla) operates the Lucky Friday Mine since 1958, which is an underground silver, lead, and zinc mine near Mullan, Idaho, USA. In the mid-1980s until 2020, the company relied on the Lucky Friday Underhand Longwall (LFUL) method for seismic control to mine (first) the Lucky Friday and (then) the Gold Hunter ore bodies. However, ...
    Public Domain
  • LongwallInduced Shale Gas Well Casing Deformations and StressesCritical Effects of Geologic and Geometric Parameters
    Longwall-Induced Shale Gas Well Casing Deformations and Stresses-Critical Effects of Geologic and Geometric Parameters
    Su WH ;
    Zhang P
    2024/06/23 | Mining Publications
    This paper summarizes geo-mechanical findings from the ongoing Gas Well Stability research at the National Institute for Occupational Safety and Health (NIOSH)-in particular, the critical effects of geologic and geometric parameters on longwall-induced gas well casing deformations and stresses. Overburden geology is one of the most important factor ...
    Public Domain
  • Lessons Learned from Recent Longwall MineBy Cases with Uncemented Casings
    Lessons Learned from Recent Longwall Mine-By Cases with Uncemented Casings
    Kim BH ;
    Su D
    2024/06/23 | Mining Publications
    Over 2,000 shale gas wells have been drilled in the longwall reserves of the Pittsburgh Coal Seam. When gas wells are in the vicinity of longwall mining, casing deformations are likely to occur due to longwall-induced subsurface movements and abutment stresses. One way to prevent casing deformation is to use a cementing alternative by leaving produ ...
    Public Domain
  • Analyzing Shale Gas Well Casing Deformation in Pittsburgh Seam Longwall Chain Pillars A Case Study Integrating Numerical Methods and Field Monitoring
    Analyzing Shale Gas Well Casing Deformation in Pittsburgh Seam Longwall Chain Pillars: A Case Study Integrating Numerical Methods and Field Monitoring
    Khademian Z ;
    Kim BH
    2024/06/23 | Mining Publications
    In the Northern Appalachian region of the U.S., the coexistence of longwall coal mining and shale gas operations is a prominent feature. The gas wells in the vicinity of the longwall operations entail the potential for casing deformations arising from mining-induced subsidence and abutment stresses. Researchers at the Pittsburgh Mining Research Div ...
    Public Domain
  • Rockfall Barrier Testing in an Open Pit Mine Comparing Empirical and Modeled Rockfall Dynamics
    Rockfall Barrier Testing in an Open Pit Mine: Comparing Empirical and Modeled Rockfall Dynamics
    McNabb JC ;
    Meyer BJ
    2024/06/23 | Mining Publications
    Rockfalls pose severe hazards to miners and infrastructure in open pit mines, and rockfall barrier systems are an increasingly common method for mitigating this hazard. Extensive testing to understand rockfall kinetics and barrier efficacy has been performed in controlled settings and natural environments, but rarely in open pit mining environments ...
    Public Domain
  • An AutoencoderBased Deep Learning Model for Enhancing Noise Characterization and Microseismic Event Detection in Underground Longwall Coal Mines Using Distributed Acoustic Sensing Monitoring
    An Autoencoder-Based Deep Learning Model for Enhancing Noise Characterization and Microseismic Event Detection in Underground Longwall Coal Mines Using Distributed Acoustic Sensing Monitoring
    Ankamah AT ;
    Chambers DJA
    2024/06/23 | Mining Publications
    The longwall mining method is designed to optimize coal extraction through controlled roof caving, which inevitably induces seismicity. This research employs a distributed acoustic sensing (DAS) system incorporating a fire-safe fiber-optic cable strategically installed underground within an operational longwall coal mine. Despite lower sensitivity ...
    Public Domain
  • Analyzing the Effect of Bolt Spacing on Coal Rib Stability Through Numerical Simulation
    Analyzing the Effect of Bolt Spacing on Coal Rib Stability Through Numerical Simulation
    Mohamed KM ;
    Xue Y
    2024/06/23 | Mining Publications
    Rib falls pose a major safety risk in underground coal mines, and there is currently no standardized approach for rib support design in the U.S. coal mines. To tackle this issue, a standalone application, Design of Rib Support (DORS), was developed for rib stability assessment and rib support design under development load. The last step of the rib ...
    Public Domain
  • CFD Analysis of Ventilation Performance of the Hospital Post Anesthesia Care Unit PACU
    CFD Analysis of Ventilation Performance of the Hospital Post Anesthesia Care Unit (PACU)
    Dunn, Kevin H. ;
    Garcia A
    2024/06/22 | National Institute for Occupational Safety and Health (NIOSH)
    Healthcare workers in post-anesthesia care units (PACU) are at risk of exposure to waste anesthetic gases (WAGs) released by patients in the recovery stage. The airflow patterns in the PACU play a crucial role in determining the spread and concentration of WAGs in the breathing zone of the occupants. A Computational Fluid Dynamics (CFD) study was c ...
    Public Domain
  • Effects of Residual PAH Exposure from Firefighters Turnout Gear on Plasma microRNA Expression
    Effects of Residual PAH Exposure from Firefighters’ Turnout Gear on Plasma microRNA Expression
    Hwang J
    2024/06/21 | Grant Final Reports
    The overall goal of this project is to assess the residual levels of selected compounds on firefighters' skin and on turnout gear, using exposure variables derived from work practices, and to investigate exposure-associated epigenetic assessment on skin and in the blood of firefighters. During this study, we collected a wide range of biological sam ...
  • Alternative Fuel Use to Reduce Diesel Emissions Exposure and Toxicity in Mining
    Alternative Fuel Use to Reduce Diesel Emissions Exposure and Toxicity in Mining
    Burgess JL
    2024/06/21 | Grant Final Reports
    In collaboration with Freeport-McMoRan, we evaluated the tail-pipe emissions of a 793B Caterpillar haul truck using diesel (D) and renewable diesel (RD) fuels at the Tyrone surface metal mine. Emissions were monitored using a portable emissions monitoring system for six hours a day while the truck performed a typical, controlled cycle using D for t ...
  • A Novel Portable KXRF Measurement System for In Vivo Metal Measurements
    A Novel Portable KXRF Measurement System for In Vivo Metal Measurements
    Specht AJ
    2024/06/21 | Grant Final Reports
    This research project focused on the validation of a new device for measurements of lead in bone using K-shell xrays and an x-ray tube source. Key accomplishments involved obtaining concrete data to ascertain the detection limits of the proposed experimental device for bone lead measurements. Significant advancements were made, such as optimizing t ...
  • Examining the Physical Mental and Social Health Outcomes Among Commercial Fishers
    Examining the Physical, Mental, and Social Health Outcomes Among Commercial Fishers
    Guillot-Wright SP
    2024/06/21 | Grant Final Reports
    The K01 award has been instrumental in our work with waterfront workers and policymaking communities. Outcomes include not only the interviews we conducted with shrimpers and decision-makers, but the ability to observe and interact with fishing communities throughout Texas for nearly three years. During the ethnographic work, we were able to implem ...
  • PalmSized LabinaMagnetofluidic Tube Platform for Rapid and Sensitive Virus Detection
    Palm-Sized Lab-in-a-Magnetofluidic Tube Platform for Rapid and Sensitive Virus Detection
    Avery L ;
    Banach D
    2024/06/19 | National Institute for Occupational Safety and Health (NIOSH)
    Simple, sensitive, and accurate molecular diagnostics are critical for preventing rapid spread of infection and initiating early treatment of diseases. However, current molecular detection methods typically rely on extensive nucleic acid sample preparation and expensive instrumentation. Here, a simple, fully integrated, lab-in-a-magnetofluidic tube ...
  • ALBA Adaptive LanguageBased Assessments for Mental Health
    ALBA: Adaptive Language-Based Assessments for Mental Health
    Kjell ONE ;
    Schwartz HA
    2024/06/16 | National Institute for Occupational Safety and Health (NIOSH)
    Mental health issues differ widely among individuals, with varied signs and symptoms. Recently, language-based assessments have shown promise in capturing this diversity, but they require a substantial sample of words per person for accuracy. This work introduces the task of Adaptive Language-Based Assessment (ALBA), which involves adaptively order ...
  • Fractal Discrete Fracture Network Modeling of Radon Gas Concentration in Underground Tunnels Under Ksiaz Castle in Poland
    Fractal Discrete Fracture Network Modeling of Radon Gas Concentration in Underground Tunnels Under Ksiaz Castle in Poland
    Ajayi KM ;
    Fijalkowska-Lichwa L
    2024/06/12 | Mining Publications
    The numerical modeling of radon concentrations in the fault zone of the underground excavations at Ksiaz Castle was conducted using a stochastic Discrete Fracture Network (DFN) model. Due to the difficulties related with obtaining the exact fractures in a rock mass, the novel approach used in this study incorporates the stochastic model with known ...
    Public Domain
  • Factors Determining Black Carbon Exposures Among Pregnant Women Enrolled in the HAPIN Trial
    Factors Determining Black Carbon Exposures Among Pregnant Women Enrolled in the HAPIN Trial
    Balakrishnan K ;
    Campbell DA
    2024/06/11 | National Institute for Occupational Safety and Health (NIOSH)
    Residential biomass burning is an important source of black carbon (BC) exposure among rural communities in low- and middle-income countries. We collected 7165 personal BC samples and individual/household level information from 3103 pregnant women enrolled in the Household Air Pollution Intervention Network trial. Women in the intervention arm rece ...
  • Construccin Narracin de Muertes un Instalador de Canalones Cae Desde el Techo de un Patio
    Construcción Narración de Muertes: un Instalador de Canalones Cae Desde el Techo de un Patio
    Washington (State). Department of Labor and Industries
    2024/06/10 | Fatality Assessment and Control Evaluation Reports (FACE)
    Un instalador de 34 años y un compañero de trabajo estaban instalando canalones en una casa de dos pisos. Comenzaron el trabajo alrededor de las 6 a.m. La primera tarea del instalador era preparar el borde del techo superior para colocar los canalones. Se dirigió a la parte trasera de la casa y usó una escalera para subir al techo del patio. Su com ...
  • Distribution of COVID19 Mitigation Measures by Industry and Work Arrangement US Blood Donors May 2021December 2021
    Distribution of COVID-19 Mitigation Measures by Industry and Work Arrangement – US Blood Donors, May 2021–December 2021
    Chiu SK ;
    De Perio, Marie A.
    2024/06/10 | National Institute for Occupational Safety and Health (NIOSH)
    Objective: To describe coronavirus disease 2019 (COVID-19) mitigation measures in workplaces of employed US blood donors by industry and work arrangement. Methods: During May-December 2021, blood donors responded to a survey; we describe the distribution of reported workplace mitigation measures by industry and work arrangement, organized using the ...
    Public Domain
  • Construction Fatality Narrative Gutter Installer Falls from Patio Roof 2004
    Construction Fatality Narrative: Gutter Installer Falls from Patio Roof [2004]
    Washington (State). Department of Labor and Industries
    2024/06/10 | Fatality Assessment and Control Evaluation Reports (FACE)
    A 34-year-old installer and a coworker were installing gutters on a two-story residential home. They started the job at about 6 a.m. The installer's first task was to prepare the upper roof edge in order to hang the gutters. He went to the back of the house and used a ladder to get onto the roof of the patio. His coworker was in the front of the ho ...
  • Assessing the influence of redlining on intergenerational wealth and body mass index through a quasiexperimental framework
    Assessing the influence of redlining on intergenerational wealth and body mass index through a quasi-experimental framework.
    Fishman P ;
    Hajat A
    2024/06/07 | National Institute for Occupational Safety and Health (NIOSH)
    Background: Higher levels of body mass index (BMI), particularly for those who have obesity defined as class II and III, are correlated with excess risk of all-cause mortality in the USA, and these risks disproportionately affects marginalized communities impacted by systemic racism. Redlining, a form of structural racism, is a practice by which fe ...
1361 - 1380 / 83319
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