The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Curtis J Donskey - One of the best experts on this subject based on the ideXlab platform.
-
Beyond high-touch surfaces: Portable Equipment and floors as potential sources of transmission of health care-associated pathogens.
American journal of infection control, 2020Co-Authors: Curtis J DonskeyAbstract:Efforts to improve environmental cleaning and disinfection typically focus primarily on high-touch surfaces in patient rooms. This review highlights evidence that Portable Equipment and other shared devices and floors may be underappreciated as sources of dissemination of health care-associated pathogens. Practical approaches to address these sites of contamination are emphasized.
-
Efficacy of a multi-purpose high level disinfection cabinet against Candida auris and other health care-associated pathogen.
American Journal of Infection Control, 2019Co-Authors: Jessica A. Kumar, Jennifer L Cadnum, Annette L Jencson, Curtis J DonskeyAbstract:Portable Equipment and other small devices used in health care are a potential source for dissemination of pathogens. We demonstrated that a high-level disinfection cabinet using ultrasonic submicron droplets of peracetic acid and hydrogen peroxide was effective against methicillin-resistant Staphylococcus aureus, Clostridiodes difficile spores, the nonenveloped virus bacteriophage MS2, and Candida auris on steel disk carriers. The device also eliminated Candida auris inoculated on real-world items of Portable Equipment.
-
1213. How Often Is Portable Equipment Cleaned in an Acute Care Setting
Open Forum Infectious Diseases, 2019Co-Authors: Y Karen Ng Wong, Heba Alhmidi, Jennifer L Cadnum, Thriveen S.c. Mana, Annette Jencson, Curtis J DonskeyAbstract:Abstract Background Portable medical Equipment that is shared among patients may frequently become contaminated with healthcare-associated pathogens. Cleaning of these devices may be suboptimal. Here, we aim to determine how frequently mobile Equipment is cleaned after being used in an acute care setting. Methods Frequency of use and cleaning practices were surveyed by observation. Thirty pieces of mobile Equipment from 4 wards including workstations, EKGs, vital signs monitor, and doppler ultrasounds were disinfected with a sporicidal disinfectant. Samples were taken before and after cleaning for recovery of methicillin-resistant Staphylococcus aureus (MRSA), C. difficile spores, and Gram-negative bacilli. After disinfection, each piece of Equipment was tagged with a colored tag to indicate the ward location and a fluorescent gel marker (FGM) was applied to study the frequency of cleaning of Portable Equipment. Mobile Equipment was checked for colored tags and fluorescent gel removal five, 12, and 20 days after application. Results Mobile Equipment was infrequently cleaned and moved readily from ward to ward. In 9 of 10 observations, mobile Equipment was used and not cleaned after use. Point prevalence sampling showed that 27.5% of mobile Equipment had one or more pathogens on them. At day 5, only 30% of Equipment marked with FGM had been cleaned and after 20 days, 23% of marked mobile Equipment remained uncleaned (figure). 4 pieces of mobile Equipment traveled from their original ward to a different ward. Conclusion Our findings demonstrate that Portable Equipment is frequently used and infrequently cleaned. These items can become contaminated with clinically relevant pathogens. We also saw that Portable Equipment frequently traveled from ward to ward. There is potential for contaminated Portable Equipment to serve as a vector for dissemination of pathogens. There is a need for effective strategies to disinfect Portable Equipment between patients. Disclosures All authors: No reported disclosures.
-
Beyond high-touch surfaces: Portable Equipment and floors as potential sources of transmission of health care–associated pathogens
American Journal of Infection Control, 2019Co-Authors: Curtis J DonskeyAbstract:Efforts to improve environmental cleaning and disinfection typically focus primarily on high-touch surfaces in patient rooms. This review highlights evidence that Portable Equipment and other shared devices and floors may be underappreciated as sources of dissemination of health care–associated pathogens. Practical approaches to address these sites of contamination are emphasized.
-
contaminated Portable Equipment is a potential vector for dissemination of pathogens in the intensive care unit
Infection Control and Hospital Epidemiology, 2017Co-Authors: Amrita John, Heba Alhmidi, Jennifer L Cadnum, Annette L Jencson, Curtis J DonskeyAbstract:A DNA marker inoculated onto shared Portable Equipment in surgical and medical intensive care units disseminated widely to surfaces in patient rooms and provider work areas and to other types of Portable Equipment. These results demonstrate the potential for contaminated Portable Equipment to serve as a vector for dissemination of pathogens. Infect Control Hosp Epidemiol 2017;38:1247–1249
Ahmad Pirouzmand - One of the best experts on this subject based on the ideXlab platform.
-
Probabilistic safety assessment of Portable Equipment applied in VVER-1000/V446 nuclear reactor during loss of ultimate heat sink accident for stress test program development
Progress in Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract After the Fukushima Daiichi nuclear accident, all EU nuclear power plants became subject to safety assessments as stress test programs. The objective was to check and improve the capability of nuclear safety systems in withstanding damage from hazards caused by flooding, earthquakes, terrorist attack or aircraft collision. The two most important nuclear accidents which are considered after the Fukushima accident are loss of ultimate heat sink (LUHS) and station blackout. The LUHS is one of the most important accidents, which can be recognized as a severe accident and is caused by severe natural phenomena. In this paper, for the first time, the LUHS accident and its management as a stress test program is assessed in a VVER-1000/V446 reference nuclear reactor. By applying some Portable diesel pumps which can provide long term cooling of the reactor core, steam generators and spent fuel pool with the available NPP site demineralized water for long duration; the stress test strategy is assessed. To estimate the effect of Portable Equipment on the NPP safety, the probabilistic safety assessment (PSA) is adopted. In this method, fault trees of engineering safety features including the proposed Portable Equipment and event trees of different initiating events are applied to estimate the frequency of each accident sequence. The safety of the nuclear power plant is assessed by the risk measure of core damage frequency (CDF). The calculated CDF values of LUHS accident with and without deploying the Portable diesel pumps are 1.01E-11(yr −1 ) and 1.419E-8 (yr −1 ), respectively. The results indicate a significant decrease in CDF of the VVER-1000/V446 nuclear reactor for the LUHS accident by applying Portable Equipment, introduced as a stress test program.
-
Thermal-hydraulic modeling for deterministic safety analysis of Portable Equipment application in the VVER-1000 nuclear reactor during loss of ultimate heat sink accident using RELAP5/MOD3.2 code
Annals of Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract Thermal-hydraulic model is an important tool in deterministic safety analysis of the Nuclear Power Plant (NPP) which would confirm the adequacy and efficiency of provisions in the defense in depth concept to cope with challenges of the plant safety. In this paper, for the first time, a validated thermal-hydraulic model is presented for Deterministic Safety Analysis of the Portable Equipment to be applied in VVER-1000 nuclear reactor during severe accident. Therefore, the VVER-1000 as a case study reactor model is assessed and evaluated through RELAP5/MOD3.2 thermal hydraulic code during the loss of ultimate heat sink accident. Since LUHS accident is absent in the Final Safety Analysis Report of the nuclear power plant, this accident scenario is analyzed for the first time in this study. The simulation is done for two situations of with and without safety modification. This modification is related to Portable Equipment application which would maintain the primary or secondary circuit cooling in long term. The results of these simulations indicate that LUHS would lead to fuel failure and finally core meltdown. But, the modified LUHS simulation shows that this designed Portable Equipment can remove the decay heat of the core or transfer the heat into the ultimate heat sink in a continuous manner until the safety systems recovery become possible. Indeed, the most important achievements of this paper consist of: preparation of emergency instructions, accident management at the time of loss of ultimate heat sink and the training of NPP's personnel.
Z. Tabadar - One of the best experts on this subject based on the ideXlab platform.
-
Probabilistic safety assessment of Portable Equipment applied in VVER-1000/V446 nuclear reactor during loss of ultimate heat sink accident for stress test program development
Progress in Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract After the Fukushima Daiichi nuclear accident, all EU nuclear power plants became subject to safety assessments as stress test programs. The objective was to check and improve the capability of nuclear safety systems in withstanding damage from hazards caused by flooding, earthquakes, terrorist attack or aircraft collision. The two most important nuclear accidents which are considered after the Fukushima accident are loss of ultimate heat sink (LUHS) and station blackout. The LUHS is one of the most important accidents, which can be recognized as a severe accident and is caused by severe natural phenomena. In this paper, for the first time, the LUHS accident and its management as a stress test program is assessed in a VVER-1000/V446 reference nuclear reactor. By applying some Portable diesel pumps which can provide long term cooling of the reactor core, steam generators and spent fuel pool with the available NPP site demineralized water for long duration; the stress test strategy is assessed. To estimate the effect of Portable Equipment on the NPP safety, the probabilistic safety assessment (PSA) is adopted. In this method, fault trees of engineering safety features including the proposed Portable Equipment and event trees of different initiating events are applied to estimate the frequency of each accident sequence. The safety of the nuclear power plant is assessed by the risk measure of core damage frequency (CDF). The calculated CDF values of LUHS accident with and without deploying the Portable diesel pumps are 1.01E-11(yr −1 ) and 1.419E-8 (yr −1 ), respectively. The results indicate a significant decrease in CDF of the VVER-1000/V446 nuclear reactor for the LUHS accident by applying Portable Equipment, introduced as a stress test program.
-
Thermal-hydraulic modeling for deterministic safety analysis of Portable Equipment application in the VVER-1000 nuclear reactor during loss of ultimate heat sink accident using RELAP5/MOD3.2 code
Annals of Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract Thermal-hydraulic model is an important tool in deterministic safety analysis of the Nuclear Power Plant (NPP) which would confirm the adequacy and efficiency of provisions in the defense in depth concept to cope with challenges of the plant safety. In this paper, for the first time, a validated thermal-hydraulic model is presented for Deterministic Safety Analysis of the Portable Equipment to be applied in VVER-1000 nuclear reactor during severe accident. Therefore, the VVER-1000 as a case study reactor model is assessed and evaluated through RELAP5/MOD3.2 thermal hydraulic code during the loss of ultimate heat sink accident. Since LUHS accident is absent in the Final Safety Analysis Report of the nuclear power plant, this accident scenario is analyzed for the first time in this study. The simulation is done for two situations of with and without safety modification. This modification is related to Portable Equipment application which would maintain the primary or secondary circuit cooling in long term. The results of these simulations indicate that LUHS would lead to fuel failure and finally core meltdown. But, the modified LUHS simulation shows that this designed Portable Equipment can remove the decay heat of the core or transfer the heat into the ultimate heat sink in a continuous manner until the safety systems recovery become possible. Indeed, the most important achievements of this paper consist of: preparation of emergency instructions, accident management at the time of loss of ultimate heat sink and the training of NPP's personnel.
K. Hirasawa - One of the best experts on this subject based on the ideXlab platform.
-
Experimental results with mobile antennas having cross-polarization components in urban and rural areas
IEEE Transactions on Vehicular Technology, 1990Co-Authors: H. Kuboyama, K. Fujimoto, Y. Tanaka, K. Sato, K. HirasawaAbstract:The receiving performance of mobile antenna systems that have vertical and horizontal elements at the 920-MHz band has been investigated by measurements in both rural and urban areas in Japan. Three types of inverted-F antennas for a car and three types of antenna elements, a monopole, a bent-slot and an inverted-F antenna, for Portable Equipment were used in the experiments. The average received power and its probability density function are obtained as the parameter to evaluate the performance of antenna systems. The performances of the bent-slot antenna system for Portable Equipment and the inverted-F antenna system mounted on a car are compared with those of the monopole or dipole antenna systems used as reference antennas. A notable increase in the average received power has been observed in operation in an urban area where the field distributes randomly and consists of cross-polarized components.
G.r. Ansarifar - One of the best experts on this subject based on the ideXlab platform.
-
Probabilistic safety assessment of Portable Equipment applied in VVER-1000/V446 nuclear reactor during loss of ultimate heat sink accident for stress test program development
Progress in Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract After the Fukushima Daiichi nuclear accident, all EU nuclear power plants became subject to safety assessments as stress test programs. The objective was to check and improve the capability of nuclear safety systems in withstanding damage from hazards caused by flooding, earthquakes, terrorist attack or aircraft collision. The two most important nuclear accidents which are considered after the Fukushima accident are loss of ultimate heat sink (LUHS) and station blackout. The LUHS is one of the most important accidents, which can be recognized as a severe accident and is caused by severe natural phenomena. In this paper, for the first time, the LUHS accident and its management as a stress test program is assessed in a VVER-1000/V446 reference nuclear reactor. By applying some Portable diesel pumps which can provide long term cooling of the reactor core, steam generators and spent fuel pool with the available NPP site demineralized water for long duration; the stress test strategy is assessed. To estimate the effect of Portable Equipment on the NPP safety, the probabilistic safety assessment (PSA) is adopted. In this method, fault trees of engineering safety features including the proposed Portable Equipment and event trees of different initiating events are applied to estimate the frequency of each accident sequence. The safety of the nuclear power plant is assessed by the risk measure of core damage frequency (CDF). The calculated CDF values of LUHS accident with and without deploying the Portable diesel pumps are 1.01E-11(yr −1 ) and 1.419E-8 (yr −1 ), respectively. The results indicate a significant decrease in CDF of the VVER-1000/V446 nuclear reactor for the LUHS accident by applying Portable Equipment, introduced as a stress test program.
-
Thermal-hydraulic modeling for deterministic safety analysis of Portable Equipment application in the VVER-1000 nuclear reactor during loss of ultimate heat sink accident using RELAP5/MOD3.2 code
Annals of Nuclear Energy, 2019Co-Authors: Z. Tabadar, G.r. Ansarifar, Ahmad PirouzmandAbstract:Abstract Thermal-hydraulic model is an important tool in deterministic safety analysis of the Nuclear Power Plant (NPP) which would confirm the adequacy and efficiency of provisions in the defense in depth concept to cope with challenges of the plant safety. In this paper, for the first time, a validated thermal-hydraulic model is presented for Deterministic Safety Analysis of the Portable Equipment to be applied in VVER-1000 nuclear reactor during severe accident. Therefore, the VVER-1000 as a case study reactor model is assessed and evaluated through RELAP5/MOD3.2 thermal hydraulic code during the loss of ultimate heat sink accident. Since LUHS accident is absent in the Final Safety Analysis Report of the nuclear power plant, this accident scenario is analyzed for the first time in this study. The simulation is done for two situations of with and without safety modification. This modification is related to Portable Equipment application which would maintain the primary or secondary circuit cooling in long term. The results of these simulations indicate that LUHS would lead to fuel failure and finally core meltdown. But, the modified LUHS simulation shows that this designed Portable Equipment can remove the decay heat of the core or transfer the heat into the ultimate heat sink in a continuous manner until the safety systems recovery become possible. Indeed, the most important achievements of this paper consist of: preparation of emergency instructions, accident management at the time of loss of ultimate heat sink and the training of NPP's personnel.