Organic pollution is a serious environmental problem in coastal areas and it is important to establish quantitative methods for monitoring this pollution.This study screened a series of sensitive biomarkers to constru...Organic pollution is a serious environmental problem in coastal areas and it is important to establish quantitative methods for monitoring this pollution.This study screened a series of sensitive biomarkers to construct an integrated biomarker response(IBR)index using Mytilus edulis.Mussels were exposed to the polycyclic aromatic hydrocarbon anthracene under controlled laboratory conditions and the activities of components of the glutathione antioxidant system,and the concentrations of oxidative-damage markers,were measured in the gills and digestive glands.Anthracene exposure resulted in increased levels of malondialdehyde(MDA)and superoxide radicals(O~ˉ_2?),indicating that oxidative damage had occurred.Correspondingly,anthracene exposure induced increased activities of glutathione S-transferase(GST),glutathione peroxidase(GPx)and reduced glutathione(GSH)in digestive glands,and GPx and glutathione reductase(GR)in gills,consistent with stimulation of the antioxidant system.A fi eld experiment was set up,in which mussels from a relatively clean area were transplanted to a contaminated site.One month later,the activities of GST,GPx and GR had increased in several tissues,particularly in the digestive glands.Based on the laboratory experiment,an IBR,which showed a positive relationship with anthracene exposure,was constructed.The IBR is suggested to be a potentially useful tool for assessing anthracene pollution.展开更多
Biological aerated filters have many advantages such as small volume and high treatment efficiency. This research focused on sewage treatment performance of integrated biological aerated filter (IBAF) under different ...Biological aerated filters have many advantages such as small volume and high treatment efficiency. This research focused on sewage treatment performance of integrated biological aerated filter (IBAF) under different conditions such as aeration, hydraulic retention time and the height of fillers layer, to identify the turn of marked affecting factor of removal performance through orthogonal experiments, optimize the function parameter of IBAF, reveal the regularity of sewage treatment of IBAF under different conditions, and adopt suitable measures to guarantee excess water quality of IBAF.展开更多
An L band RF linac is now under installation at CIAE to provide intense electronbeam for a far-infrared free-electron laser oscillator.This linac consists of a DC thermionicgun,a subharmonic prebuncher,a buncher,an ac...An L band RF linac is now under installation at CIAE to provide intense electronbeam for a far-infrared free-electron laser oscillator.This linac consists of a DC thermionicgun,a subharmonic prebuncher,a buncher,an accelerating section and a beam transport line.From the INEX(Integrated Numerical Experiment)conducted for prediction of the perfor-mance of the complex and the comparison of some of the simulation results with available ex-perimental data,it shows that the beam quality can satisfy our FEL requirements.展开更多
Existing vehicle experiment systems tend to focus on the research of vehicle dynamics by conducting performance tests on every system or some parts of the vehicle so as to improve the entire performance of the vehicle...Existing vehicle experiment systems tend to focus on the research of vehicle dynamics by conducting performance tests on every system or some parts of the vehicle so as to improve the entire performance of the vehicle.Virtual technology is widely utilized in various vehicle test-beds.These test-beds are mainly used to simulate the driving training,conduct the research on drivers' behaviors,or give virtual demonstrations of the transportation environment.However,the study on the active safety of the running vehicle in the virtual environment is still insufficient.A virtual scene including roads and vehicles is developed by using the software Creator and Vega,and radars and cameras are also simulated in the scene.Based on dSPACE's rapid prototyping simulation and its single board DS1103,a simulation model including vehicle control signals is set up in MATLAB/Simulink,the model is then built into C code,and the system defined file(SDF) is downloaded to the DS1103 board through the experiment debug software ControlDesk and is kept running.Programming is made by mixing Visual C++ 6.0,MATLAB API and Vega API.Control signals are read out by invoking library function MLIB/MTRACE of dSPACE.All the input,output,and system state values are acquired by arithmetic and are dynamically associated with the running status of the virtual vehicle.An intelligent vehicle experiment system is thus developed by virtue of program and integration.The system has not only the demonstration function,such as general driving,cruise control,active avoiding collision,but also the function of virtual experiment.Parameters of the system can be set according to needs,and the virtual test results can be analyzed and studied and used for the comparison with the existing models.The system reflects the running of the intelligent vehicle in the virtual traffic environment,at the same time,the system is a new attempt performed on the intelligent vehicle travel research and provides also a new research method for the development of intelligent vehicles.展开更多
Differences on teaching goals between general English and business English are obvious to teachers. However, experi-ence gap commonly found among pre-experience business English learners may prevent them from understa...Differences on teaching goals between general English and business English are obvious to teachers. However, experi-ence gap commonly found among pre-experience business English learners may prevent them from understanding their specific needs of learning business English, hence resulting in the fallback on learning general English. This gap may also lead to their diffi-culties in understanding complex business concepts. This article analyzes the characteristics of pre-experience learners and elabo-rates on potential benefits of"guest speakers"which can be introduced into classes to help students narrow the experience gap.展开更多
目的分析与整合颅脑肿瘤患儿重返校园的体验,并寻找支持性因素。方法计算机检索中国知网、万方数据知识服务平台、维普资讯中文期刊服务平台、Web of Science、PubMed、Medline、CINAHL、Embase,收集有关颅脑肿瘤患儿重返校园体验的质...目的分析与整合颅脑肿瘤患儿重返校园的体验,并寻找支持性因素。方法计算机检索中国知网、万方数据知识服务平台、维普资讯中文期刊服务平台、Web of Science、PubMed、Medline、CINAHL、Embase,收集有关颅脑肿瘤患儿重返校园体验的质性研究文献。采用澳大利亚乔安娜·布里格斯研究所循证卫生保健中心的汇集性整合方法进行文献结果整合。结果共纳入11篇文献,从中提炼出46个主题,可归纳组合形成11个新的类别,最终得到4个整合结果。4个整合结果分别为疾病及治疗的持续影响、重返校园融入体验、顺利重返校园的支持因素、信息沟通与传播障碍。结论颅脑肿瘤对患儿产生持续的消极影响,医护人员应积极承担信息联络角色并提供有效支持,促进颅脑肿瘤患儿成功重返校园。展开更多
背景既往研究显示,脑卒中患者卒中后疲劳(PSF)发生率高达25%~85%,持续不断的疲乏感严重影响患者日常生活和康复进程,因此亟需了解此类患者的心理体验和需求,但既往已进行的单一的质性研究结果可能不具有代表性。目的系统评价和整合卒中...背景既往研究显示,脑卒中患者卒中后疲劳(PSF)发生率高达25%~85%,持续不断的疲乏感严重影响患者日常生活和康复进程,因此亟需了解此类患者的心理体验和需求,但既往已进行的单一的质性研究结果可能不具有代表性。目的系统评价和整合卒中后疲劳患者疲劳体验的质性研究,为构建PSF患者疲劳管理策略提供依据。方法计算机检索PsycINFO、PubMed、Web of Science、CINAHL、Cochrane Library、Scopus、澳大利亚安娜布里格斯研究所(JBI)循证卫生保健数据库及中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库,搜集与PSF患者疲劳体验相关的质性研究。检索时限为建库至2023-07-05。采用澳大利亚JBI循证卫生保健中心质性研究质量评价标准(2016)进行质量评价,并采用汇集性整合的方法进行Meta整合。结果共纳入10篇文献,提炼出22个主要结果,归纳为8个类别,综合为4个整合结果:对PSF的认知严重匮乏;存在错综复杂的负性身心体验;PSF的自我调适方式多样;存在多种PSF康复需求。结论PSF患者对疲劳认知不足且存在明显负性身心体验,因此应早期识别和筛查PSF患者,强化对患者的疲劳教育并为其制订个性化疲劳管理策略,同时应重视发挥社区和家庭在PSF患者疲劳管理中的作用,使其与医护人员一同为PSF患者提供良好的康复环境。展开更多
基金Supported by the Joint Funds of National Natural Science Foundation of ChinaMarine Science Research Center of the People’s Government of Shandong Province(No.U1406403)
文摘Organic pollution is a serious environmental problem in coastal areas and it is important to establish quantitative methods for monitoring this pollution.This study screened a series of sensitive biomarkers to construct an integrated biomarker response(IBR)index using Mytilus edulis.Mussels were exposed to the polycyclic aromatic hydrocarbon anthracene under controlled laboratory conditions and the activities of components of the glutathione antioxidant system,and the concentrations of oxidative-damage markers,were measured in the gills and digestive glands.Anthracene exposure resulted in increased levels of malondialdehyde(MDA)and superoxide radicals(O~ˉ_2?),indicating that oxidative damage had occurred.Correspondingly,anthracene exposure induced increased activities of glutathione S-transferase(GST),glutathione peroxidase(GPx)and reduced glutathione(GSH)in digestive glands,and GPx and glutathione reductase(GR)in gills,consistent with stimulation of the antioxidant system.A fi eld experiment was set up,in which mussels from a relatively clean area were transplanted to a contaminated site.One month later,the activities of GST,GPx and GR had increased in several tissues,particularly in the digestive glands.Based on the laboratory experiment,an IBR,which showed a positive relationship with anthracene exposure,was constructed.The IBR is suggested to be a potentially useful tool for assessing anthracene pollution.
文摘Biological aerated filters have many advantages such as small volume and high treatment efficiency. This research focused on sewage treatment performance of integrated biological aerated filter (IBAF) under different conditions such as aeration, hydraulic retention time and the height of fillers layer, to identify the turn of marked affecting factor of removal performance through orthogonal experiments, optimize the function parameter of IBAF, reveal the regularity of sewage treatment of IBAF under different conditions, and adopt suitable measures to guarantee excess water quality of IBAF.
基金The project supported by the Nuclear Industry Science Foundation of China
文摘An L band RF linac is now under installation at CIAE to provide intense electronbeam for a far-infrared free-electron laser oscillator.This linac consists of a DC thermionicgun,a subharmonic prebuncher,a buncher,an accelerating section and a beam transport line.From the INEX(Integrated Numerical Experiment)conducted for prediction of the perfor-mance of the complex and the comparison of some of the simulation results with available ex-perimental data,it shows that the beam quality can satisfy our FEL requirements.
基金supported by Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070006011)
文摘Existing vehicle experiment systems tend to focus on the research of vehicle dynamics by conducting performance tests on every system or some parts of the vehicle so as to improve the entire performance of the vehicle.Virtual technology is widely utilized in various vehicle test-beds.These test-beds are mainly used to simulate the driving training,conduct the research on drivers' behaviors,or give virtual demonstrations of the transportation environment.However,the study on the active safety of the running vehicle in the virtual environment is still insufficient.A virtual scene including roads and vehicles is developed by using the software Creator and Vega,and radars and cameras are also simulated in the scene.Based on dSPACE's rapid prototyping simulation and its single board DS1103,a simulation model including vehicle control signals is set up in MATLAB/Simulink,the model is then built into C code,and the system defined file(SDF) is downloaded to the DS1103 board through the experiment debug software ControlDesk and is kept running.Programming is made by mixing Visual C++ 6.0,MATLAB API and Vega API.Control signals are read out by invoking library function MLIB/MTRACE of dSPACE.All the input,output,and system state values are acquired by arithmetic and are dynamically associated with the running status of the virtual vehicle.An intelligent vehicle experiment system is thus developed by virtue of program and integration.The system has not only the demonstration function,such as general driving,cruise control,active avoiding collision,but also the function of virtual experiment.Parameters of the system can be set according to needs,and the virtual test results can be analyzed and studied and used for the comparison with the existing models.The system reflects the running of the intelligent vehicle in the virtual traffic environment,at the same time,the system is a new attempt performed on the intelligent vehicle travel research and provides also a new research method for the development of intelligent vehicles.
文摘Differences on teaching goals between general English and business English are obvious to teachers. However, experi-ence gap commonly found among pre-experience business English learners may prevent them from understanding their specific needs of learning business English, hence resulting in the fallback on learning general English. This gap may also lead to their diffi-culties in understanding complex business concepts. This article analyzes the characteristics of pre-experience learners and elabo-rates on potential benefits of"guest speakers"which can be introduced into classes to help students narrow the experience gap.
文摘目的分析与整合颅脑肿瘤患儿重返校园的体验,并寻找支持性因素。方法计算机检索中国知网、万方数据知识服务平台、维普资讯中文期刊服务平台、Web of Science、PubMed、Medline、CINAHL、Embase,收集有关颅脑肿瘤患儿重返校园体验的质性研究文献。采用澳大利亚乔安娜·布里格斯研究所循证卫生保健中心的汇集性整合方法进行文献结果整合。结果共纳入11篇文献,从中提炼出46个主题,可归纳组合形成11个新的类别,最终得到4个整合结果。4个整合结果分别为疾病及治疗的持续影响、重返校园融入体验、顺利重返校园的支持因素、信息沟通与传播障碍。结论颅脑肿瘤对患儿产生持续的消极影响,医护人员应积极承担信息联络角色并提供有效支持,促进颅脑肿瘤患儿成功重返校园。
文摘背景既往研究显示,脑卒中患者卒中后疲劳(PSF)发生率高达25%~85%,持续不断的疲乏感严重影响患者日常生活和康复进程,因此亟需了解此类患者的心理体验和需求,但既往已进行的单一的质性研究结果可能不具有代表性。目的系统评价和整合卒中后疲劳患者疲劳体验的质性研究,为构建PSF患者疲劳管理策略提供依据。方法计算机检索PsycINFO、PubMed、Web of Science、CINAHL、Cochrane Library、Scopus、澳大利亚安娜布里格斯研究所(JBI)循证卫生保健数据库及中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库,搜集与PSF患者疲劳体验相关的质性研究。检索时限为建库至2023-07-05。采用澳大利亚JBI循证卫生保健中心质性研究质量评价标准(2016)进行质量评价,并采用汇集性整合的方法进行Meta整合。结果共纳入10篇文献,提炼出22个主要结果,归纳为8个类别,综合为4个整合结果:对PSF的认知严重匮乏;存在错综复杂的负性身心体验;PSF的自我调适方式多样;存在多种PSF康复需求。结论PSF患者对疲劳认知不足且存在明显负性身心体验,因此应早期识别和筛查PSF患者,强化对患者的疲劳教育并为其制订个性化疲劳管理策略,同时应重视发挥社区和家庭在PSF患者疲劳管理中的作用,使其与医护人员一同为PSF患者提供良好的康复环境。
