The presence of sulfur in coals has raised serious environmental issues, which are obstacles to large-scale utilization coals. Hydrothermal dewatering (HTD) is a promising upgrading method for low-rank (LRCs) significantly remove oxygen-containing groups and irreversibly decrease the inherent moisture content. To uncouple complex behavior evolution during HTD processing lignite elucidate main mechanism, this research experimentally studied characteristics transformation Chinese from...

A single differential equation of the eighth order in radial displacement is given for equilibrium an element a cylindrical shell undergoing small displacements due to laterally distributed external load.The deflection thin shells subjected concentrated, equal and opposite forces, acting at ends vertical diameter, analyzed by Fourier method.Applications solution problem infinitely long cylinder problems couple on direction either generatrix or circumference are also discussed.

An excess of mesothelioma has been previously observed in iron ore miners Northeastern Minnesota. This study explored the potential association between and elongate mineral particle (EMP) exposures Minnesota taconite mining industry, examining both regulated non-regulated EMP dimensions. A nested case-control design within Mineral Resources Health Assessment Programme cohort analysed 104 cases 410 controls. Cumulative were assessed across various dimensional definitions, including (National...

The intricate imaging structures, artifacts, and noise present in ultrasound images videos pose significant challenges for accurate segmentation. Deep learning has recently emerged as a prominent field, playing crucial role medical image processing. This paper reviews video segmentation methods based on deep techniques, summarizing the latest developments this such diffusion segment anything models well classical methods. These are classified into four main categories characteristics of Each...

The high moisture content of low-rank coals (LRCs) is associated with the noncovalent interactions between coal and water, such as hydrogen bonding van der Waals attraction. In this study, molecular model lignite was constructed its electrostatic potential (ESP) on a surface analyzed. mechanism water absorption hydrophilic or hydrophobic sites investigated based atoms in molecules analysis reduced density gradient seven typical lignite···water complexes. regions most negative positive ESP...

A theoretical investigation was made of flow hot fluid over a porous flat plate under the condition uniform injection from bottom plate. The von Karman integral relation momentum equation derived with velocity taken into consideration. profile assumed as polynomial fourth degree. Solution above gave relationship length m direction to boundary-layer thickness. profiles and temperature were then calculated for Prandtl Number equal unity. between wall rate coolant Injection different Mach...

Exposure judgments made without personal exposure data and based instead on subjective inputs tend to underestimate exposure, with judgment accuracy not significantly more accurate than random chance. Therefore, objective that contribute decision making are needed. Models have been shown anecdotally be useful in accurately predicting but their use occupational hygiene has limited. This may attributable a general lack of guidance model selection scant input data. The systematic evaluation the...

Drawing appropriate conclusions about a scenario for which the exposure is truly unacceptable drives and risk management, protects health safety of those individuals. To ensure vast majority these decisions are accurate, must be based upon proven approaches tools. When solely on professional judgment guided by subjective inputs, however, they more than likely wrong, biased, underestimating true exposure. Models have been shown anecdotally to useful in accurately predicting but their use...

Abstract Spontaneous combustion behaviour and physicochemical characteristics of Ximeng lignite dewatered by hydrothermal dewatering (HTD) were investigated. In addition, effect upgrading temperature, as well the mechanism for evolution spontaneous propensity was discussed. The results showed that after HTD, fixed carbon content increased, whereas equilibrium moisture volatile decreased; aromatic carbons increased relatively at expense oxygen‐containing functional groups aliphatic...

Objectives Previous radiologic and histopathologic studies suggest respirable crystalline silica (RCS) overexposure has been driving the resurgence of pneumoconiosis among contemporary US coal miners, with a higher prevalence severe disease in Central Appalachia. We sought to better understand RCS exposure underground miners. Methods analysed levels, as measured by quartz, from mine dust compliance data 1982 2021. Results 322 919 quartz samples 5064 mines. Mean mine-level percentage mass...

This paper is concerned with the response of a rigid body subjected to base excitation. Using analytical and numerical methods investigation, results are presented in series graphs giving (1) criteria for initiation various modes (rest, slide, rock slide-rock) and, using an ensemble 75 real earthquake acceleration records, (2) mean plus standard deviation distance sliding relative (3) probability overturning during rocking. Based on (3), two tables prepared which give, corresponding equal...

Hairdressers are exposed to particulate matter (PM), a known air pollutant linked adverse health effects. Still, studies on occupational PM exposures in hair salons sparse. We characterized indoor concentrations three primarily serving an African/African American (AA) clientele, and Dominican Latino clientele. also assessed the performance of low-cost sensors (uRAD, Flow, AirVisual) by comparing them high-end (DustTrak) conduct monitoring each salon over 3 days quantify work shift PM2.5,...

The use of the turbulent eddy diffusion model and its variants in exposure assessment is limited due to lack knowledge regarding isotropic coefficient, DT. But some studies have suggested a possible relationship between DT air changes per hour (ACH) through room. main goal this study was accurately estimate for range ACH values by minimizing difference concentrations measured predicted model. We constructed an experimental chamber with spatial concentration gradient away from contaminant...

Engineered stone countertops, popularly known as quartz or artificial have gained significant attraction due to their durability and aesthetic appeal. However, high crystalline silica content, the fabrication of these countertops poses severe health risks workers, evidenced by numerous global cases silicosis. The study aimed assess occupational exposure respirable (RCS) among fabricators in Chicago characterize elemental composition physical properties engineered dust. Eight professional...

Among the destruction instances of half-through arch bridges, shorter hangers are more likely to be ruined. For a thorough investigation hanger system durability, we have studied vehicle impact effect on with vehicle-bridge coupling method for concrete-filled-steel-tube bridge. A numerical has been applied simulate variation dynamic internal force (stress) in under different speeds and road surface roughness. The characteristics differences among length (position) compared. is further...

As part of ongoing epidemiological studies for assessing the association between exposure to dust from taconite operations and development respiratory diseases, goal this study was reconstruct exposures workers elongate mineral particle (EMP) in Minnesota mining industry 1955–2010. Historical NIOSH-7400 equivalent EMP personal data were extracted two sources: (1) Mine Safety Health Administration (MSHA) online database recorded all inspection results since 1978 with 655 monitoring records...