This paper describes the self—adjustment of some tuning-knobs of the generalized predictive controller(GPC).A three feedforward neural network was utilized to on line learn two key tuning-knobs of GPC,and BP algorith...This paper describes the self—adjustment of some tuning-knobs of the generalized predictive controller(GPC).A three feedforward neural network was utilized to on line learn two key tuning-knobs of GPC,and BP algorithm was used for the training of the linking-weights of the neural network.Hence it gets rid of the difficulty of choosing these tuning-knobs manually and provides easier condition for the wide applications of GPC on industrial plants.Simulation results illustrated the effectiveness of the method.展开更多
The relation between structures and properties of polyurethane are investigated by modern physical and chemical methods.The results obtained are as follows:the effects of the content of self-crosslinking agent on the ...The relation between structures and properties of polyurethane are investigated by modern physical and chemical methods.The results obtained are as follows:the effects of the content of self-crosslinking agent on the properties of polyurethane,i.e.,dispersion stability,dynamical viscoelasticity and mechanical properties are discussed.It is found that the optimum molar ratio of epichlorohydrin and diethylenetriamine is 1:2.A mois-展开更多
The Belt and Road Initiative contains the aspiration of Chinese nation to pursue ideological freedom and desire of strengthening international exchanges and cooperation. This paper takes the Belt and Road Initiative f...The Belt and Road Initiative contains the aspiration of Chinese nation to pursue ideological freedom and desire of strengthening international exchanges and cooperation. This paper takes the Belt and Road Initiative for example,emphasizing the interpretation of the inheritance and development of Chinese culture so as to study the importance of Culture Self-Consciousness in Chinese Philosophy,in the context of English globalization. That is to say,this paper stresses the spirits and the stand of nation 's demonstration on pursuing peace,cooperation and sustainable development in the civilization continuity from traditional China to the contemporary China,with practical philosophic view.展开更多
Paul-Baker systems with 4° flat field and 5° fiat field are studied. Their light obstructions under different f/ratios of the primary mirror are analyzed. Due to the strong f/ratio of the system, a focal len...Paul-Baker systems with 4° flat field and 5° fiat field are studied. Their light obstructions under different f/ratios of the primary mirror are analyzed. Due to the strong f/ratio of the system, a focal length extender is designed in order to match the following fiber instrumentation, and two kinds of dispersion prism correctors are designed for correcting the atmospheric dispersion. We compare the designed Paul-Baker system with LAMOST, the national major scientific project now under construction.展开更多
Background: Awareness of hearing disability in the elderly has adverse cognitive and functional consequences over time, in a longitudinal population-based study. Aim: To analyze the hypothesis that over time old peopl...Background: Awareness of hearing disability in the elderly has adverse cognitive and functional consequences over time, in a longitudinal population-based study. Aim: To analyze the hypothesis that over time old people aware of hearing disability make less use of technology and lose more instrumental activities of daily living than peers with other self-reported hearing conditions. Methods: We analyzed 1171 healthy participants in the longitudinal population-based InveCe.Ab study. The consistency between self-reported hearing loss with clinician-evaluated hearing status (Whispered Voice Test;WVT), was categorized by consistency as: unaware of hearing loss (UHL), aware of hearing loss (AHL), only subjective hearing loss (OSHL), without hearing loss (noHL). Results: At baseline (2010), hearing loss was found in 159 [13.6% (95% CI: 11.7 - 15.7)] of the participants [28 = 17.6% (95% CI: 12.0 - 24.4) AHL;131 = 82.4% (95% CI: 75.6 - 88) UHL], while 23 [2.3% (95% CI: 1.4 - 3.4)] of the subjects with normal WVT had OSHL. Mobile phone usage was significantly associated with different consistency categories (p i.e. executive, memory and visuo-spatial) were independently associated with maintaining mobile phone usage and instrumental activities of daily living. Conclusion: Self-reported hearing disability is linked to subsequent loss of mobile phone usage and functional dependency. As cognitive performances independently influence technology usage and functional impairment, targeted preventive interventions should address functional impact of perceived hearing loss, but also encourage social participation and improve mobile phone usage. Trial registration: ClinicalTrials.gov, NCT01345110;registered on April 29, 2011.展开更多
Instrument calibration is vital to a successful control system because signal inputs to the system controllers come from such instruments. This paper presents a method for actualizing a standard low-cost loop calibrat...Instrument calibration is vital to a successful control system because signal inputs to the system controllers come from such instruments. This paper presents a method for actualizing a standard low-cost loop calibrator for the famous 4-20 mA electrical signaling scheme. The loop calibrator generates a linear current signal from 4 to 20 mA over a 250 ? typical process instrument load for calibration. The realization of the loop calibrator relies on a voltage-to-current converter to build a constant current source. The voltage controlled constant current source is built from discrete components and an op-amp to keep the cost low. Results from simulations and the prototype demonstrate the performance of the 4-20 mA loop calibrator which utilizes a greatly reduced number of components. The cost of these components is approximately 34% of the least expensive calibrator sampled, though other production costs are not included. This conclusion reinforces the fact that loop calibrators can be cheaper.展开更多
目的系统评价我国高血压患者自我管理评估工具的测量属性及相关研究的方法学质量,为医护人员选择合适的评估工具提供循证支持。方法检索中国生物医学文献数据库、中国知网、维普、万方、PubMed、Embase、Web of Science、the Cochrane L...目的系统评价我国高血压患者自我管理评估工具的测量属性及相关研究的方法学质量,为医护人员选择合适的评估工具提供循证支持。方法检索中国生物医学文献数据库、中国知网、维普、万方、PubMed、Embase、Web of Science、the Cochrane Library、CINAHL、ProQuest等数据库中有关中文版高血压患者自我管理评估工具测量属性评价的研究,检索时限为建库至2023年5月。由2名研究人员独立进行文献筛选及数据提取,根据基于专家共识的患者报告结局测量工具的遴选指南对评估工具的测量属性及相关研究的方法学质量进行评定,并形成最终推荐意见。结果共纳入7项研究,涉及7种中文版高血压患者自我管理评估工具,纳入研究报告的评估工具测量属性仅涉及内容效度、结构效度、内部一致性、稳定性。由于6种评估工具的内容效度均为“不确定”,1项研究未报告评估工具的内容效度,故无A类推荐工具,B类推荐工具有5种,C类推荐工具有2种。仅高血压病人自我管理行为测评量表具有高质量证据证明其内部一致性和结构效度为“充分”。结论中文版高血压患者自我管理评估工具多样,但质量整体不高。高血压病人自我管理行为测评量表的结构效度和内部一致性证据质量良好,可暂时被推荐使用,但在其他测量属性方面仍存在不足,未来还需进一步研究完善。展开更多
基金Supported by the National 863 CIMS Project Foundation(863-511-010)Tianjin Natural Science Foundation(983602011)Backbone Young Teacher Project Foundation of Ministry of Education
文摘This paper describes the self—adjustment of some tuning-knobs of the generalized predictive controller(GPC).A three feedforward neural network was utilized to on line learn two key tuning-knobs of GPC,and BP algorithm was used for the training of the linking-weights of the neural network.Hence it gets rid of the difficulty of choosing these tuning-knobs manually and provides easier condition for the wide applications of GPC on industrial plants.Simulation results illustrated the effectiveness of the method.
文摘The relation between structures and properties of polyurethane are investigated by modern physical and chemical methods.The results obtained are as follows:the effects of the content of self-crosslinking agent on the properties of polyurethane,i.e.,dispersion stability,dynamical viscoelasticity and mechanical properties are discussed.It is found that the optimum molar ratio of epichlorohydrin and diethylenetriamine is 1:2.A mois-
文摘The Belt and Road Initiative contains the aspiration of Chinese nation to pursue ideological freedom and desire of strengthening international exchanges and cooperation. This paper takes the Belt and Road Initiative for example,emphasizing the interpretation of the inheritance and development of Chinese culture so as to study the importance of Culture Self-Consciousness in Chinese Philosophy,in the context of English globalization. That is to say,this paper stresses the spirits and the stand of nation 's demonstration on pursuing peace,cooperation and sustainable development in the civilization continuity from traditional China to the contemporary China,with practical philosophic view.
文摘Paul-Baker systems with 4° flat field and 5° fiat field are studied. Their light obstructions under different f/ratios of the primary mirror are analyzed. Due to the strong f/ratio of the system, a focal length extender is designed in order to match the following fiber instrumentation, and two kinds of dispersion prism correctors are designed for correcting the atmospheric dispersion. We compare the designed Paul-Baker system with LAMOST, the national major scientific project now under construction.
文摘Background: Awareness of hearing disability in the elderly has adverse cognitive and functional consequences over time, in a longitudinal population-based study. Aim: To analyze the hypothesis that over time old people aware of hearing disability make less use of technology and lose more instrumental activities of daily living than peers with other self-reported hearing conditions. Methods: We analyzed 1171 healthy participants in the longitudinal population-based InveCe.Ab study. The consistency between self-reported hearing loss with clinician-evaluated hearing status (Whispered Voice Test;WVT), was categorized by consistency as: unaware of hearing loss (UHL), aware of hearing loss (AHL), only subjective hearing loss (OSHL), without hearing loss (noHL). Results: At baseline (2010), hearing loss was found in 159 [13.6% (95% CI: 11.7 - 15.7)] of the participants [28 = 17.6% (95% CI: 12.0 - 24.4) AHL;131 = 82.4% (95% CI: 75.6 - 88) UHL], while 23 [2.3% (95% CI: 1.4 - 3.4)] of the subjects with normal WVT had OSHL. Mobile phone usage was significantly associated with different consistency categories (p i.e. executive, memory and visuo-spatial) were independently associated with maintaining mobile phone usage and instrumental activities of daily living. Conclusion: Self-reported hearing disability is linked to subsequent loss of mobile phone usage and functional dependency. As cognitive performances independently influence technology usage and functional impairment, targeted preventive interventions should address functional impact of perceived hearing loss, but also encourage social participation and improve mobile phone usage. Trial registration: ClinicalTrials.gov, NCT01345110;registered on April 29, 2011.
文摘Instrument calibration is vital to a successful control system because signal inputs to the system controllers come from such instruments. This paper presents a method for actualizing a standard low-cost loop calibrator for the famous 4-20 mA electrical signaling scheme. The loop calibrator generates a linear current signal from 4 to 20 mA over a 250 ? typical process instrument load for calibration. The realization of the loop calibrator relies on a voltage-to-current converter to build a constant current source. The voltage controlled constant current source is built from discrete components and an op-amp to keep the cost low. Results from simulations and the prototype demonstrate the performance of the 4-20 mA loop calibrator which utilizes a greatly reduced number of components. The cost of these components is approximately 34% of the least expensive calibrator sampled, though other production costs are not included. This conclusion reinforces the fact that loop calibrators can be cheaper.
文摘目的系统评价我国高血压患者自我管理评估工具的测量属性及相关研究的方法学质量,为医护人员选择合适的评估工具提供循证支持。方法检索中国生物医学文献数据库、中国知网、维普、万方、PubMed、Embase、Web of Science、the Cochrane Library、CINAHL、ProQuest等数据库中有关中文版高血压患者自我管理评估工具测量属性评价的研究,检索时限为建库至2023年5月。由2名研究人员独立进行文献筛选及数据提取,根据基于专家共识的患者报告结局测量工具的遴选指南对评估工具的测量属性及相关研究的方法学质量进行评定,并形成最终推荐意见。结果共纳入7项研究,涉及7种中文版高血压患者自我管理评估工具,纳入研究报告的评估工具测量属性仅涉及内容效度、结构效度、内部一致性、稳定性。由于6种评估工具的内容效度均为“不确定”,1项研究未报告评估工具的内容效度,故无A类推荐工具,B类推荐工具有5种,C类推荐工具有2种。仅高血压病人自我管理行为测评量表具有高质量证据证明其内部一致性和结构效度为“充分”。结论中文版高血压患者自我管理评估工具多样,但质量整体不高。高血压病人自我管理行为测评量表的结构效度和内部一致性证据质量良好,可暂时被推荐使用,但在其他测量属性方面仍存在不足,未来还需进一步研究完善。
