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1.
Bioresource Technology Reports ; 22 (no pagination), 2023.
Article in English | EMBASE | ID: covidwho-2320295

ABSTRACT

Increasing amounts of surfactants are used and emitted into the environment due to the COVID-19 pandemic, posing potential threats to ecological health. Algal-bacterial aerobic granular sludge (A-BAGS), with the advantages of compact structure, high-efficient nutrient uptake, and high tolerance to harsh conditions, was attempted in this study to treat surfactant-containing wastewater at relatively high concentrations. The treatment performance was also compared to bacterial AGS (BAGS). Results showed that A-BAGS is preferable for treating wastewater containing a high SDS concentration (30 mg/L), achieving nutrient removal efficiency of 86.3 % for organic carbon, 60.5 % for total nitrogen, and 58.7 % for total phosphorus within a short duration, compared to 70.1 %, 52.8 % and 42.3 % in BAGS reactor. Besides, the removal rate of ammonia nitrogen by A-BAGS was much faster than that of BAGS. The above results confirmed that A-BAGS is a promising technology for treating surfactant-containing wastewater with high nutrient removal efficiency being maintained.Copyright © 2023 Elsevier Ltd

2.
Chinese Journal of Radiological Medicine and Protection ; 40(10):783-788, 2020.
Article in Chinese | EMBASE | ID: covidwho-2269955

ABSTRACT

Objective: To investigate the application value of third-generation dual-source CT(3-G DSCT) low-dose scan mode combined with iterative reconstruction technology in the screening of COVID-19 and to evaluate the radiation dose. Method(s): One hundred and twenty patients suspected of COVID-19 from December 2019 to February 2020 were retrospectively analysed and randomly divided into two groups (test group and conventional group, 60 patients in each). The parameters for test group included 3-G DSCT, Turbo Flash scan mode, CARE kV, with reference 90 kV, pitch 2.0, and ADMIRE algorithm, while those parameters for conventional group included the 128-slice CT, conventional spiral scan mode, 120 kV, pitch 1.2, and FBP algorithm. The CT values of aorta, spinal posterior muscle, and subcutaneous fat, the aortic noise, signal-to-noise ratio (SNR), and contrast noise ratio (CNR) were compared to evaluate the image quality between two groups. Two experienced doctors scored the image quality using a double-blind method, and compared the CT dose index volume (CTDIvol), dose-length product (DLP), and effective dose (E) of the two groups. Result(s): The CT value of the aorta and spinal posterior muscle and the aortic SNR in the test group were (45.38+/-4.77), (53.41+/-8.44) HU, and 2.82+/-0.59, and significantly higher than those in the conventional group [(39.68+/-6.26), (42.66+/-6.32) HU, 2.58+/-0.61, t=5.608, 7.897, 2.162, P<0.05]. The aortic noise, CNR and subjective scores between the two groups had no significant difference( P>0.05). The CTDIvol, DLP, and E in the test group were (3.09+/-1.02) mGy, (107.57+/-32.81) mGy*cm, (1.51+/-0.46) mSv, significantly lower than those in the conventional group [(7.00+/-1.80) mGy, (261.65+/-73.93) mGy*cm, (3.66+/-1.03) mSv;t=-14.680, -14.756, -14.756, P<0.05]. Conclusion(s): In the screening of COVID-19, using low-dose scanning mode of 3-G DSCT combined with iterative reconstruction technology would provide diagnostic quality images and meanwhile effectively reduce the radiation dose and improve the SNR of the image.Copyright © 2020 by the Chinese Medical Association.

3.
Chinese Journal of Radiological Medicine and Protection ; 40(10):794-797, 2020.
Article in Chinese | EMBASE | ID: covidwho-2268688

ABSTRACT

Objective: To explore a low dose CT scanning method on novel coronavirus (COVID-19) pneumonia based on infection prevention and control. Method(s): A total of 140 patients with confirmed novel coronavirus pneumonia in Xiehe hospital from January 20, 2020 to February 28, 2020 were undertaken CT scan and divided into low dose group and conventional dose group. The patients in low dose group(120 kV, 31 mAs) consisted of mild type(51), severe type(15) and critically ill type(4);and those in conventional dose group(120 kv, adaptive milliampere second) consisted of mild type(48), severe type(17) and critically ill type(5). The effective radiation dose, SNR and CNR of CT scan were compared between two groups. A senior and a middle radiologist made the image subjective quality scores, respectively. Result(s): The effective dose in low dose group was lower than that of conventional dose group(t=-48.343, P<0.05). There was no significant difference in SNR and CNR between two groups(P>0.05). For severe and critically ill patients, the score in low dose group was significantly lower than that in conventional dose group(t=-2.781, P<0.05). There was no significant difference in scores between two groups for mild patients(P>0.05). Conclusion(s): Low-dose CT scanning could meet the image quality needs for patients with COVID-19 and meanwhile significantly reduce the radiation dose.Copyright © 2020 by the Chinese Medical Association.

4.
Chinese Journal of Radiological Medicine and Protection ; 40(10):798-801, 2020.
Article in Chinese | EMBASE | ID: covidwho-2288764

ABSTRACT

Since February 9th, 2020, the mobile CT in Jianghan mobile cabin hospital had begun to be used for scanning patients with COVID-19.The mobile CT has played an irreplaceable role in clinical diagnosis with its unique advantages. During CT scanning, the technicians should not only ensure that the patients receive the radiation dose as low as possible, but also be aware of the importance of the infection prevention and control. Meanwhile, we need concern the technicians about the psychological problems and should take effective action when they occured.Copyright © 2020 by the Chinese Medical Association.

5.
Chinese Journal of Radiological Medicine and Protection ; 40(4):253-258, 2020.
Article in Chinese | EMBASE | ID: covidwho-2283519

ABSTRACT

Objective: To survey and supervise the risk of infection control and radiation safety in the radiological diagnostic workplace for COVID-19, and provide data support for the safety protection of radiographers and related staff. Method(s): 4 emergency hospitals for COVID-19 including 2 makeshift hospitals, module hospital and brick pattern hospital in Hubei province were performed for testing and evaluation of imaging performance and radiological protection for the 8 new installed CT scanners and places according to the national standards of WS 519-2019 and GBZ 130-2013. The infection control safety factors such as the layout of the equipment room were monitored and investigated. Two COVID-19 designated hospitals including general hospital and infectious disease specialized hospital were selected to carry out field investigation and sampling of environmental biological samples for 4 CT rooms. Then the samples were detected for the nucleic acid of novel coronavirus. The results of radiodiagnostic workplace overall arrangement, infection prevention and the nucleic acid testing were analyzed, and the biological safety reliability and risk point were evaluated. Result(s): The indicators of imaging performance and radiation protection for 8 CT scanners in emergency hospitals could meet the requirements of national standards.Each of 2 makeshift hospitals had 3 CT rooms with the area of 38.8 m2 and 4 mm Pb equivalent thickness of protective shielding. The CT rooms in module hospital and brick pattern hospital were 20.0 m2, and 35.8 m2 in areas, with 4 mm Pb equivalent and 3 mm Pb equivalent thickness of protection shielding, respectively. The 8 radiological diagnostic workplaces of the emergency hospitals were designed and constructed based on " three zones with two passage ways". The result of the nucleic acid test indicated that the positive samples were found at the multiple sites such as scanning bed, internal of gantry and ground touched by patients in CT scanning room. The areas such as console panel and ground were risked of pollution by the virus infected hands and feet of radiographers. In addition, the similar positive samples were found in the areas in scanning room with no touch of patients, such as observation window and air outlet. Conclusion(s): 8 CT scanners and rooms in 4 emergency hospitals basically meet the requirements of imaging performance and radiation protection. The disinfection of COVID-19 radiodiagnostic workplace should be standardized.Copyright © 2020 by the Chinese Medical Association.

6.
International Journal of Engineering Education ; 38(5):1505-1512, 2022.
Article in English | Web of Science | ID: covidwho-2102194

ABSTRACT

The coronavirus disease 2019 (COVID-19) has changed education, which stimulated the adoption of online teaching and learning. Therefore, the research on the impact of COVID-19 on online laboratories, which can be used for online teaching and learning assessment, is crucial to enlighten the effects of COVID-19 on engineering education. Using the online laboratory Networked Control System Laboratory (NCSLab) as a case study, the research in this paper is aimed to fill the gap of COVID-19 on education by exploring the visitors and users of this online laboratory. To illustrate the impact of the COVID-19 pandemic, a special 100-day time slot in 2020 within the COVID-19 pandemic is selected, and data are collected from a web analytics tool and records in the NCSLab database. For comparison, corresponding data in 2018 and 2019 are also collected within a specific 100-day time slot. The results show that there is an increase in both the numbers of visitors and users to NCSLab, and an increase in experiment configurations during the COVID-19 pandemic compared with the previous two years in 2018 and 2019, which indicates that more learners are seeking alternatives for remote learning. The evaluation results show that the online laboratory is helpful to the comprehension of course content and achieves intended outcomes, while the use of online laboratories as a replacement for traditional laboratories is controversial. As the effects of the COVID-19 pandemic may continue for years globally, the research in this paper could provide insights for future research and development of online laboratories and also for other online education platforms.

7.
Ieee Industrial Electronics Magazine ; : 13, 2022.
Article in English | Web of Science | ID: covidwho-1985489
8.
Chinese Journal of Laboratory Medicine ; 45(2):200-206, 2022.
Article in Chinese | EMBASE | ID: covidwho-1917897

ABSTRACT

In view of the significant changes in the prevention and control of COVID-19 at home and abroad, "external prevention of importation and internal prevention of rebound" has become the focus of prevention and control of the epidemic in China. Due to the limitation of testing sites, equipment and reaction time, traditional detection methods cannot meet the needs of real-time and rapid detection of 2019-nCoV. Point-of-care testing (POCT) is rapid, portable and flexible. It plays an increasingly important role in the rapid detection and screening of 2019-nCoV. Here, we review the current status and research progress of POCT for 2019-nCoV in terms of antigens, specific antibodies and nucleic acids, in order to provide reference for epidemic prevention and control and clinical management.

9.
Biophysical Journal ; 121(3):42-42, 2022.
Article in English | Web of Science | ID: covidwho-1755835
10.
Chinese Journal of General Practitioners ; 21(1):59-65, 2022.
Article in Chinese | Scopus | ID: covidwho-1715853

ABSTRACT

Objective To investigate the compassion fatigue of medical staff working in centralized quarantine sites and its influencing factors during the COVID-19 epidemic. Methods From September 2020 to October 2020, a cross-sectional study was conducted on 213 medical staff working in 13 quarantine centers in two districts of Shanghai. A self-made general information questionnaire, professional quality of life scale, general self-efficacy scale and perceived social support scale were used in the study. Results The score of empathy satisfaction was 33.00(28.25, 37.75), and there were 141 cases (66.20%) with supercritical value. The score of job burnout was 26.00(21.50, 30.50), and 96 cases (45.07%) exceeded the critical value. The score of secondary traumatic stress was 25.00(20.50, 29.50), and 192 cases (90.14%) exceeded the critical value. Multivariate logistic regression analysis showed that average daily working hours, job satisfaction, self-evaluation of work pressure, general self-efficacy and perceived social support were the influencing factors of compassion fatigue among medical staff. Compared with those who worked for 0 h in the polluted area, those who worked for more than 8 h had a higher degree of compassion fatigue (OR=7.787, 95%CI: 1.127-53.820);compared with those who were more satisfied with their work, those who were less satisfied with their work had a higher degree of compassion fatigue (OR= 6.209,95%CI:1.474-26.157);compared with those with no or low stress, those with high stress had higher degree of compassion fatigue (OR=2.567, 95%CI: 1.228-5.366);compared with those with high self-confidence, those with low self-confidence or moderate self-confidence had higher degree of compassion fatigue (OR=13.519, 95%CI: 3.394-53.848;OR=3.462, 95%CI: 1.038-11.548);compared with those with high perceived social support, those with low perceived social support had higher degree of compassion fatigue (OR=2.071, 95%CI: 1.027-4.175) (all P<0.05). Conclusion The status of compassion fatigue of medical staff working in the centralized quarantine sites need to be improved. We should pay more attention to the those medical staff having long daily working hours in the polluted area, those with low job satisfaction, poor self-evaluation of work pressure, poor general self-efficacy and low perceived social support. © 2022 Chinese Medical Journals Publishing House Co.Ltd. All Rights Reserved.

11.
Journal of Corporate Finance ; 72:26, 2022.
Article in English | Web of Science | ID: covidwho-1587318

ABSTRACT

Using Internet search volume of dividend-related keywords to measure investor preference for dividends that varies over time and across states, we show that dividend sentiment affects corporate policies and asset prices. Investors search more for dividends when economic conditions are poor, with the peak volume reached during the recent COVID-19 pandemic. Firms initiate or increase dividends when dividend sentiment is stronger, especially in regions with strong dividend sentiment. Shifts in dividend sentiment predict higher investor demand for dividends and higher returns for high dividend stocks. Further, mutual funds that pay high dividends receive more inflows when dividend sentiment is stronger.

12.
TMR Integrative Medicine ; 5, 2021.
Article in English | EMBASE | ID: covidwho-1359431

ABSTRACT

Objective: The clinical features and test results of Corona Virus Disease 2019 were analyzed retrospectively in order to understand the diagnostic significance of clinical test index, and to summarize the experience of clinical treatment. Methods: From February 10thto February 28th, 2020, 54 patients with Corona Virus Disease 2019 from Wuhan Red Cross hospital were included, whose clinical data were analyzed and integrated. The clinical manifestation and laboratory examination were analyzed by descriptive statistical analysis. Results: The average age of the patients was 63.9 years (40-84 years). The median time from onset to diagnosis was 6.5 days (2-20 days), and the median time from onset to first hospitalization was 8 days (3-20 days). The main manifestations were that the percentage of neutrophil increased and the number of lymphocyte decreased in most cases. Most of them were combined with liver damage and myocardial cell damage, and chest CT showed lesion of bilateral lung. Conclusion: In addition to the nucleic acid test of 2019-nCoV, some laboratory tests may indicate Corona Virus Disease 2019 in the early stages. The clinician may conduct repeated follow-up examinations to assess the progress and outcome of the disease.

13.
SAE 2021 WCX Digital Summit ; 2021.
Article in English | Scopus | ID: covidwho-1259691

ABSTRACT

China 6 emission legislation was finalized in 2018 and the full implementation nationwide is postponed to 2021 due to COVID-19. It is foreseen that the post China 6 legislation will have more stringent primary and secondary emission requirements including further reduction of nitrous oxide (N2O) emissions and likely to include limits on ammonia (NH3) emissions. This study investigated the secondary emissions (i.e. N2O and NH3) of a variety of China 6 production gasoline vehicles operating under the worldwide harmonized light vehicles test cycle (WLTC) and random test standardized aggressive (RTS 95) cycle. It was found that N2O emissions were less than 5 mg/km on all these vehicles, far below the current China 6 limit (20 mg/km), however NH3 emissions varied from 2 to 48 mg/km among the production vehicles. The mechanisms of N2O and NH3 formation and their correlation with primary emissions were also investigated. Methods to reduce N2O and NH3 emissions were discussed from the perspective of catalyst system design, including substrate volume, platinum group metals (PGM), and washcoat loading. Finally, a gasoline ammonia slip catalyst (gASC) was proposed and tested on selected vehicles as an add-on device on targeting the reduction of NH3 emissions. NH3 emissions were reduced significantly reduced below 5 mg/km on the WLTC. © 2021 SAE International. All rights reserved.

14.
Chinese Journal of Radiological Medicine and Protection ; 40(10):798-801, 2020.
Article in Chinese | Scopus | ID: covidwho-961728

ABSTRACT

Since February 9th, 2020, the mobile CT in Jianghan mobile cabin hospital had begun to be used for scanning patients with COVID-19.The mobile CT has played an irreplaceable role in clinical diagnosis with its unique advantages. During CT scanning, the technicians should not only ensure that the patients receive the radiation dose as low as possible, but also be aware of the importance of the infection prevention and control. Meanwhile, we need concern the technicians about the psychological problems and should take effective action when they occured. Copyright © 2020 by the Chinese Medical Association.

15.
Chinese Journal of Radiological Medicine and Protection ; 40(10):794-797, 2020.
Article in Chinese | Scopus | ID: covidwho-961727

ABSTRACT

Objective: To explore a low dose CT scanning method on novel coronavirus (COVID-19) pneumonia based on infection prevention and control. Methods: A total of 140 patients with confirmed novel coronavirus pneumonia in Xiehe hospital from January 20, 2020 to February 28, 2020 were undertaken CT scan and divided into low dose group and conventional dose group. The patients in low dose group(120 kV, 31 mAs) consisted of mild type(51), severe type(15) and critically ill type(4);and those in conventional dose group(120 kv, adaptive milliampere second) consisted of mild type(48), severe type(17) and critically ill type(5). The effective radiation dose, SNR and CNR of CT scan were compared between two groups. A senior and a middle radiologist made the image subjective quality scores, respectively. Results: The effective dose in low dose group was lower than that of conventional dose group(t=-48.343, P<0.05). There was no significant difference in SNR and CNR between two groups(P>0.05). For severe and critically ill patients, the score in low dose group was significantly lower than that in conventional dose group(t=-2.781, P<0.05). There was no significant difference in scores between two groups for mild patients(P>0.05). Conclusions: Low-dose CT scanning could meet the image quality needs for patients with COVID-19 and meanwhile significantly reduce the radiation dose. Copyright © 2020 by the Chinese Medical Association.

16.
Chinese Journal of Radiological Medicine and Protection ; 40(10):783-788, 2020.
Article in Chinese | Scopus | ID: covidwho-961725

ABSTRACT

Objective: To investigate the application value of third-generation dual-source CT(3-G DSCT) low-dose scan mode combined with iterative reconstruction technology in the screening of COVID-19 and to evaluate the radiation dose. Methods: One hundred and twenty patients suspected of COVID-19 from December 2019 to February 2020 were retrospectively analysed and randomly divided into two groups (test group and conventional group, 60 patients in each). The parameters for test group included 3-G DSCT, Turbo Flash scan mode, CARE kV, with reference 90 kV, pitch 2.0, and ADMIRE algorithm, while those parameters for conventional group included the 128-slice CT, conventional spiral scan mode, 120 kV, pitch 1.2, and FBP algorithm. The CT values of aorta, spinal posterior muscle, and subcutaneous fat, the aortic noise, signal-to-noise ratio (SNR), and contrast noise ratio (CNR) were compared to evaluate the image quality between two groups. Two experienced doctors scored the image quality using a double-blind method, and compared the CT dose index volume (CTDIvol), dose-length product (DLP), and effective dose (E) of the two groups. Results: The CT value of the aorta and spinal posterior muscle and the aortic SNR in the test group were (45.38±4.77), (53.41±8.44) HU, and 2.82±0.59, and significantly higher than those in the conventional group [(39.68±6.26), (42.66±6.32) HU, 2.58±0.61, t=5.608, 7.897, 2.162, P<0.05]. The aortic noise, CNR and subjective scores between the two groups had no significant difference( P>0.05). The CTDIvol, DLP, and E in the test group were (3.09±1.02) mGy, (107.57±32.81) mGy•cm, (1.51±0.46) mSv, significantly lower than those in the conventional group [(7.00±1.80) mGy, (261.65±73.93) mGy•cm, (3.66±1.03) mSv;t=-14.680, -14.756, -14.756, P<0.05]. Conclusions: In the screening of COVID-19, using low-dose scanning mode of 3-G DSCT combined with iterative reconstruction technology would provide diagnostic quality images and meanwhile effectively reduce the radiation dose and improve the SNR of the image. Copyright © 2020 by the Chinese Medical Association.

17.
Journal of Air Transport Management ; 90, 2021.
Article in English | Scopus | ID: covidwho-939024

ABSTRACT

China was the first aviation market in the world hit hard by COVID-19 and has been recovering gradually as the pandemic became largely under control within mainland China. This study reviews the recovery pattern influenced by the Chinese government's aviation policy choices, in the hope that our discussions and findings will help improve aviation policy responses elsewhere. While the domestic market in mainland China has enjoyed a quick recovery to about 80% of the pre-crisis level by July 2020, the recovery of international services has been much slower, due to the bilateral route and flight frequency/capacity control and strict requirements for health check and quarantine. China's domestic aviation market was recovered by about 80% in two months after the pandemic became under good control. Most other countries with a “curve flattening” strategy, instead of full pandemic control, may not expect the fast recovery path China has achieved. A British “travel corridor” approach may be more practical for Western countries to follow, albeit more likely to be subject to serious setbacks and disruptions. The aviation fee reductions and cost support China and many other countries have been using are helpful by reducing airlines' marginal costs, but not sufficient for carriers to return to profitability or sustainable operations. Capital injection and/or credit guarantee may be needed for many airlines to survive. With various, often uncoordinated, regulations imposed in international markets, airlines based in open economies that have small domestic markets will face particularly serious challenges during the recovery process. © 2020 Elsevier Ltd

18.
Chinese Journal of Radiological Medicine and Protection ; 40(4):253-258, 2020.
Article in Chinese | Scopus | ID: covidwho-832009

ABSTRACT

Objective: To survey and supervise the risk of infection control and radiation safety in the radiological diagnostic workplace for COVID-19, and provide data support for the safety protection of radiographers and related staff. Methods: 4 emergency hospitals for COVID-19 including 2 makeshift hospitals, module hospital and brick pattern hospital in Hubei province were performed for testing and evaluation of imaging performance and radiological protection for the 8 new installed CT scanners and places according to the national standards of WS 519-2019 and GBZ 130-2013. The infection control safety factors such as the layout of the equipment room were monitored and investigated. Two COVID-19 designated hospitals including general hospital and infectious disease specialized hospital were selected to carry out field investigation and sampling of environmental biological samples for 4 CT rooms. Then the samples were detected for the nucleic acid of novel coronavirus. The results of radiodiagnostic workplace overall arrangement, infection prevention and the nucleic acid testing were analyzed, and the biological safety reliability and risk point were evaluated. Results: The indicators of imaging performance and radiation protection for 8 CT scanners in emergency hospitals could meet the requirements of national standards.Each of 2 makeshift hospitals had 3 CT rooms with the area of 38.8 m2 and 4 mm Pb equivalent thickness of protective shielding. The CT rooms in module hospital and brick pattern hospital were 20.0 m2, and 35.8 m2 in areas, with 4 mm Pb equivalent and 3 mm Pb equivalent thickness of protection shielding, respectively. The 8 radiological diagnostic workplaces of the emergency hospitals were designed and constructed based on " three zones with two passage ways". The result of the nucleic acid test indicated that the positive samples were found at the multiple sites such as scanning bed, internal of gantry and ground touched by patients in CT scanning room. The areas such as console panel and ground were risked of pollution by the virus infected hands and feet of radiographers. In addition, the similar positive samples were found in the areas in scanning room with no touch of patients, such as observation window and air outlet. Conclusions: 8 CT scanners and rooms in 4 emergency hospitals basically meet the requirements of imaging performance and radiation protection. The disinfection of COVID-19 radiodiagnostic workplace should be standardized. Copyright © 2020 by the Chinese Medical Association.

19.
Zhonghua Er Ke Za Zhi ; 58(0): E006, 2020 Feb 11.
Article in Chinese | MEDLINE | ID: covidwho-699
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