BACKGROUND Conventional reusable endoscopes have high disinfection costs because of their large size.In this study,we compared the effectiveness,safety,and operation performance of the portable disposable large-channe...BACKGROUND Conventional reusable endoscopes have high disinfection costs because of their large size.In this study,we compared the effectiveness,safety,and operation performance of the portable disposable large-channel endoscope that we developed with those of a conventional gastroscope in endoscopic submucosal dissection(ESD).AIM To compare two gastroscopes in ESD for effectiveness and safety.METHODS Ten Bama pigs were subjected to gastroscopy and ESD after general anesthesia.The experiment was completed by four experienced endoscopists.First,two endoscopists randomly selected the portable disposable large-channel or conventional gastroscope to complete gastroscopy procedures.The other two endoscopists assessed the quality of endoscopic images.After endoscopy,all of the endoscopists randomly used the portable disposable large-channel endoscope or the conventional gastroscope for ESD.Endoscopic operation performance,submucosal dissection time,total procedure time,total submucosal injection volume,specimen size,success rate of en bloc resection,muscular injury rate,and complications were compared between the endoscopes.RESULTS No significant differences in gastroscopy duration or in the integrity,sharpness,saturation,and brightness of the gastroscopic images were observed between the gastroscopes.For ESD,no significant differences in endoscopic operation performance,incision time,submucosal dissection time,total procedure time,total submucosal injection volume,specimen size,or success rate of en bloc resection were observed between the gastroscopes.Neither gastroscope caused muscular injury or treatment-related complica-tions.CONCLUSION The portable disposable large-channel endoscope can be used safely and effectively for gastroscopy and treatment.展开更多
The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. Th...The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. The influences of hydraulic retention time （HRT）, air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater was treated by the BAF process under optimal conditions： the HRT of 1.0 h, the air/water volume flow ratio of about 5 ： 1 and the backwashing cycle of every 4-7 days. The results showed that the average removal efficiency of COD, oil pollutants and SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5, 0.27, 14.5 mg·L^-1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat the wastewater.展开更多
In the first part of the article, the column and the bag experiments concerning removal of polycyclic aromatic hydrocarbons (PAHs) and nonpolar oil (NPO) from tunnel wash waters using organic sorbent materials have be...In the first part of the article, the column and the bag experiments concerning removal of polycyclic aromatic hydrocarbons (PAHs) and nonpolar oil (NPO) from tunnel wash waters using organic sorbent materials have been described. This part presents the results of removal of toxic metals. The metals of concern (Al, As, Cd, Cr, Cu, Fe, Pb, Mo, Ni, and Zn) were selected based on the priority toxicant pollutants defined in surface water quality criteria. Concentrations of these metals in the collected effluent...展开更多
Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research top...Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research topic at present.In this paper,the chemical composition and water quality characteristics of landfill leachate were briefly introduced,and the characteristics and performance of nanofiltration technology were summarized at first.Afterwards,the recent advances in the application of nanofiltration combination technology in the treatment of landfill leachate at home and abroad were summarized,and the research and application of the combination of membrane separation,chemical coagulation,chemical oxidation and adsorption methods with nanofiltration membrane in the treatment of landfill leachate were mainly introduced.Finally,it is proposed that the combination of nanofiltration technology is feasible and economical,and its reasonable selection and optimization are the directions of future research and have good application prospects.展开更多
Objective: to study the optimization method of outpatient triage process and its practical application value. Methods: from January, 2020 to December, 2020, 200 outpatients in our hospital were selected as the general...Objective: to study the optimization method of outpatient triage process and its practical application value. Methods: from January, 2020 to December, 2020, 200 outpatients in our hospital were selected as the general group, and the patients were treated by the traditional process. From January, 2021 to December, 2021, 200 outpatients in our hospital were selected as the optimization group, and patients were given process optimization during outpatient treatment, which mainly included optimizing the triage desk environment, rationally allocating triage nurses resources, improving triage nurses communication skills, and constructing information triage process. The triage accuracy rate of two groups of patients was counted, and the registration time, waiting time for auxiliary examination and treatment time of two groups of patients were counted, to investigate the satisfaction of two groups of patients with outpatient triage service and the occurrence of nurse-patient disputes. Results: the accuracy rate of triage in the optimized group was 95%, which was higher than 81% in the general group (P < 0.05). The registration time, waiting time for auxiliary examination and visiting time of patients in the optimized group were shorter than those in the general group (P < 0.05). Patients satisfaction with the rationality of outpatient triage process in the optimized group was 94%, which was higher than that in the general group (76%, P < 0.05). The patients satisfaction with the convenience of outpatient triage process in the optimized group was 96%, which was higher than that in the general group (74%, P < 0.05). There were 10 cases of nurse-patient disputes in the general group, with a nurse-patient dispute rate of 5%, and 1 case in the optimized group, with a nurse-patient dispute rate of 0.5%. The nurse-patient dispute rate in the optimized group was lower than that in the general group (P < 0.05). Conclusion: in outpatient triage service, process optimization through resource integration, strengthening nurse-patient communication, strengthening information construction and optimizing post allocation can effectively improve triage accuracy and patient treatment efficiency, improve patient nursing satisfaction and prevent nurse-patient disputes.展开更多
Limestones are generally vulnerable to various weathering effects, hence, protection and consolidation of them is necessary. Locally available limestones of Northern Cyprus have been used in both historical buildings ...Limestones are generally vulnerable to various weathering effects, hence, protection and consolidation of them is necessary. Locally available limestones of Northern Cyprus have been used in both historical buildings dated back to the 16th century for conservation applications and new buildings mostly as a cladding material. However, certain decay patterns exist on these stones. In the current study, the service life of Cyprus stones was inspected. Alkoxysilane-based consolidation and protection treatments were applied on new quarried stones to enhance the stone properties and aged stones to conserve and protect the architectural heritage. Service life assessment was performed by applying accelerated aging tests on both new and aged stones before and after treatments. The treatments improved the physical, mechanical and durability properties of the stones in terms of unchanging the water vapor diffusion resistance factor, decreasing the porosity and the water absorption ratio, increasing the ultrasound pulse velocity, the compressive and the flexural strengths, and improving the resistance of the stones against wetting-drying, freeze-thaw, salt crystallization and SO2 vapour effects. The combination of consolidation and protection treatment (K2) was more efficient on the properties of the stones compared to only protection treatment (K1) due to the better penetration capacity, higher decreasing ratio of the porosity, and higher improvement of the physical, mechanical and durability proper-ties. The treatments also improved the properties of the aged stones;thus, it may be inferred that treatment would benefit the conservation of historical buildings.展开更多
文摘BACKGROUND Conventional reusable endoscopes have high disinfection costs because of their large size.In this study,we compared the effectiveness,safety,and operation performance of the portable disposable large-channel endoscope that we developed with those of a conventional gastroscope in endoscopic submucosal dissection(ESD).AIM To compare two gastroscopes in ESD for effectiveness and safety.METHODS Ten Bama pigs were subjected to gastroscopy and ESD after general anesthesia.The experiment was completed by four experienced endoscopists.First,two endoscopists randomly selected the portable disposable large-channel or conventional gastroscope to complete gastroscopy procedures.The other two endoscopists assessed the quality of endoscopic images.After endoscopy,all of the endoscopists randomly used the portable disposable large-channel endoscope or the conventional gastroscope for ESD.Endoscopic operation performance,submucosal dissection time,total procedure time,total submucosal injection volume,specimen size,success rate of en bloc resection,muscular injury rate,and complications were compared between the endoscopes.RESULTS No significant differences in gastroscopy duration or in the integrity,sharpness,saturation,and brightness of the gastroscopic images were observed between the gastroscopes.For ESD,no significant differences in endoscopic operation performance,incision time,submucosal dissection time,total procedure time,total submucosal injection volume,specimen size,or success rate of en bloc resection were observed between the gastroscopes.Neither gastroscope caused muscular injury or treatment-related complica-tions.CONCLUSION The portable disposable large-channel endoscope can be used safely and effectively for gastroscopy and treatment.
基金Supported by the Foundation of Science and Technology Project of Guangdong Province (2004B33301001)
文摘The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. The influences of hydraulic retention time （HRT）, air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater was treated by the BAF process under optimal conditions： the HRT of 1.0 h, the air/water volume flow ratio of about 5 ： 1 and the backwashing cycle of every 4-7 days. The results showed that the average removal efficiency of COD, oil pollutants and SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5, 0.27, 14.5 mg·L^-1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat the wastewater.
基金the Norwegian Public Roads Administration (Statens Vegvesen Vegdirektoratet)Bioforsk programme "Urban Runoff" founded for preparation of this article
文摘In the first part of the article, the column and the bag experiments concerning removal of polycyclic aromatic hydrocarbons (PAHs) and nonpolar oil (NPO) from tunnel wash waters using organic sorbent materials have been described. This part presents the results of removal of toxic metals. The metals of concern (Al, As, Cd, Cr, Cu, Fe, Pb, Mo, Ni, and Zn) were selected based on the priority toxicant pollutants defined in surface water quality criteria. Concentrations of these metals in the collected effluent...
基金Supported by Science and Technology Project of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.(YCSY2020kyA-14).
文摘Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research topic at present.In this paper,the chemical composition and water quality characteristics of landfill leachate were briefly introduced,and the characteristics and performance of nanofiltration technology were summarized at first.Afterwards,the recent advances in the application of nanofiltration combination technology in the treatment of landfill leachate at home and abroad were summarized,and the research and application of the combination of membrane separation,chemical coagulation,chemical oxidation and adsorption methods with nanofiltration membrane in the treatment of landfill leachate were mainly introduced.Finally,it is proposed that the combination of nanofiltration technology is feasible and economical,and its reasonable selection and optimization are the directions of future research and have good application prospects.
文摘Objective: to study the optimization method of outpatient triage process and its practical application value. Methods: from January, 2020 to December, 2020, 200 outpatients in our hospital were selected as the general group, and the patients were treated by the traditional process. From January, 2021 to December, 2021, 200 outpatients in our hospital were selected as the optimization group, and patients were given process optimization during outpatient treatment, which mainly included optimizing the triage desk environment, rationally allocating triage nurses resources, improving triage nurses communication skills, and constructing information triage process. The triage accuracy rate of two groups of patients was counted, and the registration time, waiting time for auxiliary examination and treatment time of two groups of patients were counted, to investigate the satisfaction of two groups of patients with outpatient triage service and the occurrence of nurse-patient disputes. Results: the accuracy rate of triage in the optimized group was 95%, which was higher than 81% in the general group (P < 0.05). The registration time, waiting time for auxiliary examination and visiting time of patients in the optimized group were shorter than those in the general group (P < 0.05). Patients satisfaction with the rationality of outpatient triage process in the optimized group was 94%, which was higher than that in the general group (76%, P < 0.05). The patients satisfaction with the convenience of outpatient triage process in the optimized group was 96%, which was higher than that in the general group (74%, P < 0.05). There were 10 cases of nurse-patient disputes in the general group, with a nurse-patient dispute rate of 5%, and 1 case in the optimized group, with a nurse-patient dispute rate of 0.5%. The nurse-patient dispute rate in the optimized group was lower than that in the general group (P < 0.05). Conclusion: in outpatient triage service, process optimization through resource integration, strengthening nurse-patient communication, strengthening information construction and optimizing post allocation can effectively improve triage accuracy and patient treatment efficiency, improve patient nursing satisfaction and prevent nurse-patient disputes.
文摘Limestones are generally vulnerable to various weathering effects, hence, protection and consolidation of them is necessary. Locally available limestones of Northern Cyprus have been used in both historical buildings dated back to the 16th century for conservation applications and new buildings mostly as a cladding material. However, certain decay patterns exist on these stones. In the current study, the service life of Cyprus stones was inspected. Alkoxysilane-based consolidation and protection treatments were applied on new quarried stones to enhance the stone properties and aged stones to conserve and protect the architectural heritage. Service life assessment was performed by applying accelerated aging tests on both new and aged stones before and after treatments. The treatments improved the physical, mechanical and durability properties of the stones in terms of unchanging the water vapor diffusion resistance factor, decreasing the porosity and the water absorption ratio, increasing the ultrasound pulse velocity, the compressive and the flexural strengths, and improving the resistance of the stones against wetting-drying, freeze-thaw, salt crystallization and SO2 vapour effects. The combination of consolidation and protection treatment (K2) was more efficient on the properties of the stones compared to only protection treatment (K1) due to the better penetration capacity, higher decreasing ratio of the porosity, and higher improvement of the physical, mechanical and durability proper-ties. The treatments also improved the properties of the aged stones;thus, it may be inferred that treatment would benefit the conservation of historical buildings.
