Risk assessment before and after solar photocatalytic degradation of BTEX contaminated groundwater at a gas station site in Korea

2008 ◽  
Vol 27 (4) ◽  
pp. 447-459 ◽  
Author(s):  
Il-Hyoung Cho ◽  
Kyungho Choi ◽  
Hojeong Kang ◽  
Kyung-Duk Zoh
Keyword(s):  
Risk Assessment ◽  
Photocatalytic Degradation ◽  
Contaminated Groundwater ◽  
Before And After ◽  
Gas Station ◽  
Station Site

Colorectal cancer lifetime risk accuracy and behavior change intentions before and after risk assessment

2021 ◽  
Author(s):  
Carrie A. Miller ◽  
Andrew J. Barnes ◽  
Bernard F. Fuemmeler ◽  
Maria D. Thomson
Keyword(s):  
Colorectal Cancer ◽  
Risk Assessment ◽  
Behavior Change ◽  
Lifetime Risk ◽  
Before And After ◽  
And Behavior

scholarly journals Photocatalytic Degradation of Malachite Green Dye from Aqueous Solution Using Environmentally Compatible Ag/ZnO Polymeric Nanofibers

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2033
Author(s):  
Marwa F. Elkady ◽  
Hassan Shokry Hassan
Keyword(s):  
Photocatalytic Degradation ◽  
Malachite Green ◽  
Degradation Efficiency ◽  
Solution Flow Rate ◽  
Gravimetric Analysis ◽  
Electrospinning Technique ◽  
Malachite Green Dye ◽  
Polymeric Nanofibers ◽  
Before And After ◽  
Surface Modified

An efficient, environmentally compatible and highly porous, silver surface-modified photocatalytic zinc oxide/cellulose acetate/ polypyrrole ZnO/CA/Ppy hybrid nanofibers matrix was fabricated using an electrospinning technique. Electrospinning parameters such as solution flow rate, applied voltage and the distance between needles to collector were optimized. The optimum homogenous and uniform ZnO/CA/Ppy polymeric composite nanofiber was fabricated through the dispersion of 0.05% wt ZnO into the dissolved hybrid polymeric solution with an average nanofiber diameter ranged between 125 and 170 nm. The fabricated ZnO-polymeric nanofiber was further surface-immobilized with silver nanoparticles to enhance its photocatalytic activity through the reduction of the nanofiber bandgap. A comparative study between ZnO polymeric nanofiber before and after silver immobilization was investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and thermal gravimetric analysis (TGA). The photocatalytic degradation efficiency of the two different prepared nanofibers before and after nanosilver immobilization for malachite green (MG) dye was compared against various experimental parameters. The optimum degradation efficiency of nanosilver surface-modified ZnO-polymeric nanofibers was recorded as 93.5% for malachite green dye after 1 h compared with 63% for ZnO-polymeric nanofibers.

scholarly journals Risk Assessment of Multi-area Interconnected Power System under Gas Station Network Attacked

2020 ◽  
Vol 53 (2) ◽  
pp. 1801-1806
Author(s):  
Xue Li ◽  
Zhourong Zhang ◽  
Dajun Du ◽  
Jing Dong ◽  
Yulong Wang
Keyword(s):  
Risk Assessment ◽  
Power System ◽  
Station Network ◽  
Interconnected Power System ◽  
Gas Station

Probabilistic Risk Assessment of Accidental ABO-Incompatible Thoracic Organ Transplantation Before and After 2003

2007 ◽  
Vol 84 (12) ◽  
pp. 1602-1609 ◽  
Author(s):  
Richard I. Cook ◽  
John Wreathall ◽  
Alison Smith ◽  
David C. Cronin ◽  
Oswaldo Rivero ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Organ Transplantation ◽  
Probabilistic Risk Assessment ◽  
Before And After ◽  
Thoracic Organ ◽  
Probabilistic Risk

scholarly journals TiO2 BEADS FOR PHOTOCATALYTIC DEGRADATION OF HUMIC ACID IN PEAT WATER

2011 ◽  
Vol 11 (3) ◽  
pp. 253-257 ◽  
Author(s):  
Winarti Andayani ◽  
Agustin N M Bagyo
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Oxalic Acid ◽  
Chemical Oxygen Demand ◽  
Photocatalytic Degradation ◽  
Uv Light ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Color Intensity ◽  
Before And After

Degradation of humic acid in aqueous solution containing TiO2 coated on ceramics beads under irradiation of 254 nm UV light has been conducted in batch reactor. The aim of this experiment was to study photocatalytic degradation of humic acid in peat water. The irradiation of the humic acid in aqueous solution was conducted in various conditions i.e solely uv, in the presence of TiO2-slurry and TiO2 beads. The color intensity, humic acid residue, conductivity and COD (chemical oxygen demand) of the solution were analyzed before and after irradiation.  The compounds produced during photodegradation were identified using HPLC. The results showed that after photocatalytic degradation, the color intensity and the COD value of the solution decreased, while the conductivity of water increased indicating mineralization of the peat water occurred. In addition, oxalic acid as the product of degradation was observed.

Common Organisms Responsible for Healthcare-associated Infection (HCAI)

2019 ◽  
Author(s):  
George Jacob ◽  
Martina N. Cummins
Keyword(s):  
Risk Assessment ◽  
High Risk ◽  
Local Policy ◽  
Healthcare Associated Infection ◽  
Beta Lactam ◽  
Beta Lactam Antibiotics ◽  
Patient Admissions ◽  
Before And After ◽  
Control And Prevention ◽  
Infectious Waste

MRSA are S. aureus which become methicillin resistant by the acquisition of the mec A gene which is on a mobile chromosomal determinant called staphylococcal cassette chromosome mec (SCC mec). The mec A gene encodes for a penicillin- binding protein (PBP2a) which has a low affinity for isoxazolyl-penicillins (MICs to oxacillin/ meticillin ≥ 4μg/ ml) and is resistant to all classes of beta-lactam antibiotics. Current Department of Health (DOH) guidance (2014) recommends that mandatory MRSA screening be streamlined to include only: ● All patient admissions to high- risk units; ● Healthcare workers; and ● All patients previously identified as colonized or infected with MRSA. The guidance also advises Trusts to follow local risk assessment policies to identify other potential high- risk units or units with a history of high endemicity of MRSA; and The guidance also recommends regular auditing of compliance with MRSA screening policy. The 2006 guideline for the control and prevention of MRSA in healthcare facilities recommends the following four measures. ● Isolation MRSA- positive patients should be nursed in a single room or if none is available, cohorting into a bay after risk assessment. Patient movement, and the number of staff and visitors looking after the patient, should be minimized. ● Hand hygiene and use of personal protective equipment (PPE) All staff and visitors should decontaminate their hands with soap and water/or an alcohol rub before and after contact with the patient or their immediate surroundings. Single-use disposable gloves and aprons/non- permeable gowns should be used by staff and visitors if there is a risk of contamination with body fluids. ● Disposal of waste and laundry All waste from colonized/ infected patients should be placed in the infectious waste stream. All linen and bedding from patients colonized/infected with MRSA should be considered as contaminated and processed as infected linen. ● Cleaning and decontamination The patient’s room should be cleaned/disinfected daily with an appropriate detergent/disinfectant as per local policy. On discharge of the patient, the room needs to be terminally cleaned before it is reused. All patient equipment should either be single-patient use or be cleaned, disinfected, and sterilized.

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