10 research outputs found
Intensively monitoring cover system thermal properties with distributed temperature sensing
Reclamation soil cover systems can range in size from hundreds of square metres at the pilot
scale to tens of hectares at the commercial scale. Performance of cover systems is typically
conducted using point scale monitoring stations. While vertically intensive, a point-source
monitoring profile is inadequate for characterizing the spatial and temporal variations of the cover
that exist at the landscape scale of interest. Distributed temperature sensing is a technology that
intensively measures temperature at 1 m resolutions over distances between 5,000 to 10,000 m.
This paper presents a series of case studies that detail how the technology can be used to the fieldscale
performance of cover systems through measurement of thermal properties.Non UBCUnreviewedOthe
Emprego de coberturas secas no controle da drenagem ĂĄcida de mina: estudos em campo Use of dry cover systems to control acid mine drainage: field studies
No sul catarinense, cristais de pirita associados a rejeitos de beneficiamento de carvĂŁo mineral, quando alterados, desencadeiam o processo conhecido como drenagem ĂĄcida de mina (DAM). Este trabalho objetivou avaliar a eficiĂȘncia de trĂȘs sistemas de coberturas secas sobre estes rejeitos, como uma opção para o controle da DAM. Agentes neutralizantes da DAM como a cinza pesada e o calcĂĄrio foram misturados com os rejeitos ou dispostos acima destes. Para reduzir a infiltração de ĂĄgua e difusĂŁo de oxigĂȘnio no meio, foi empregada uma camada de 50 cm de solo silte-argiloso compactado. Os experimentos foram monitorados por um ano, sendo analisados nos lixiviados alguns parĂąmetros indicadores da DAM, alĂ©m da presença de bactĂ©rias ferro-oxidantes e sulfato-redutoras. Os resultados obtidos indicaram uma boa eficiĂȘncia na prevenção da DAM de dois dos trĂȘs sistemas de coberturas pesquisados.<br>In the southern of the Santa Catarina state, the weathering and oxidation of pyrite-containing coal has been the major agent of Acid Mine Drainage (AMD) production. The purpose of this study was to verify the efficiency of three different cover systems to inhibit AMD. Experiments were built in field lysimeters with alkaline agents - bottom ash and limestone - placed over or mixed with fresh coal waste. To reduce the water infiltration rates and oxygen diffusion 50 cm of compact mud soil layer was put over waste. The top cover was constituted by 10 cm of the same soil, mixed with bottom ash. During one year, these experiments have been monitored through chemical (pH, Eh, Fe2+, Fe total, Al, Ca, Mg, Zn, Pb and Mn) and microbiological (Thiobacilus ferroxidans presence) composition of effluents. The results indicated that two of three cover systems employed were efficient on AMD prevention
Human blood and marrow side population stem cell and Stro-1 positive bone marrow stromal cell numbers decline with age, with an increase in quality of surviving stem cells: Correlation with cytokines
Epidemiology of intra-abdominal infection and sepsis in critically ill patients: âAbSeSâ, a multinational observational cohort study and ESICM Trials Group Project
Purpose: To describe the epidemiology of intra-abdominal infection in an international cohort of ICU patients according to a new system that classifies cases according to setting of infection acquisition (community-acquired, early onset hospital-acquired, and late-onset hospital-acquired), anatomical disruption (absent or present with localized or diffuse peritonitis), and severity of disease expression (infection, sepsis, and septic shock). Methods: We performed a multicenter (n = 309), observational, epidemiological study including adult ICU patients diagnosed with intra-abdominal infection. Risk factors for mortality were assessed by logistic regression analysis. Results: The cohort included 2621 patients. Setting of infection acquisition was community-acquired in 31.6%, early onset hospital-acquired in 25%, and late-onset hospital-acquired in 43.4% of patients. Overall prevalence of antimicrobial resistance was 26.3% and difficult-to-treat resistant Gram-negative bacteria 4.3%, with great variation according to geographic region. No difference in prevalence of antimicrobial resistance was observed according to setting of infection acquisition. Overall mortality was 29.1%. Independent risk factors for mortality included late-onset hospital-acquired infection, diffuse peritonitis, sepsis, septic shock, older age, malnutrition, liver failure, congestive heart failure, antimicrobial resistance (either methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, extended-spectrum beta-lactamase-producing Gram-negative bacteria, or carbapenem-resistant Gram-negative bacteria) and source control failure evidenced by either the need for surgical revision or persistent inflammation. Conclusion: This multinational, heterogeneous cohort of ICU patients with intra-abdominal infection revealed that setting of infection acquisition, anatomical disruption, and severity of disease expression are disease-specific phenotypic characteristics associated with outcome, irrespective of the type of infection. Antimicrobial resistance is equally common in community-acquired as in hospital-acquired infection. © 2019, The Author(s)