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Output feedback control of nonlinear time-delay systems with multiple uncertainties via an event-triggered strategy 认领 引用
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作者 Weiyong Yu Qi Chen +2 位作者 Hongbing Zhou Xiang An Qiang Liu 《Control Theory and Technology》 EI CSCD 2025年第2期321-340,共20页
This paper discusses the design of event-triggered output-feedback controller for a class of nonlinear time-delay systems with multiple uncertainties. In sharp contrast to previous works, the considered systems posses... This paper discusses the design of event-triggered output-feedback controller for a class of nonlinear time-delay systems with multiple uncertainties. In sharp contrast to previous works, the considered systems possess two important characteristics: (i) The uncertain nonlinear terms meet the linearly unmeasurable-states dependent growth with the growth rate being an unknown function of the input and output. (ii) There exist input matching uncertainty and unknown measurement sensitivity. By introducing a single dynamic gain and employing a cleverly devised event-triggering mechanism (ETM), we design a new gain-based event-triggered output-feedback controller, which globally regulates all states of the considered systems and maintains global boundedness of the closed-loop system. Furthermore, the estimation of input matching uncertainty achieves convergence towards its actual value, and Zeno behavior does not happen. Two simulation examples including a practical one show that the proposed approach is effective. 展开更多
关键词 Dynamic gain Event-triggered control Input matching uncertainty Nonlinear time-delay systems Output feedback Unknown measurement sensitivity
Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission 认领 引用 被引量：1
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作者 Lili Sun Ning Sun +16 位作者 Lubing Bai Xiang An Bin Liu Chen Sun Lixiang Fan Chuanxin Wei Yamin Han Mengna Yu Jinyi Lin Dan Lu Ning Wang Linghai Xie Kang Shen Xinwen Zhang Yanan Xu Juan Cabanillas-Gonzalez Wei Huang 《Chinese Chemical Letters》 SCIE CAS CSCD 2019年第11期1959-1964,共6页
The control of the condensed superstructure of light-emitting conjugated polymers(LCPs)is a crucial factor to obtain high performance and stable organic optoelectronic devices.Side-chain engineering strategy is an eff... The control of the condensed superstructure of light-emitting conjugated polymers(LCPs)is a crucial factor to obtain high performance and stable organic optoelectronic devices.Side-chain engineering strategy is an effective platform to tune inter chain aggregation and photophysical behaviour of LCPs.Herein,we systematically investigated the alkyl-chain branched effecton the conformational transition and photophysical behaviour of polydiarylfluorenes toward efficient blue optoelectronic devices.The branched side chain will improve materials solubility to inhibit interchain aggregation in solution according to DLS and optical analysis,which is useful to obtain high quality film.Therefore,our branched PEODPF,POYDPF pristine film present high luminance efficiency of 36.1%and 39.6%,enhanced about 20%relative to that of PODPF.Compared to the liner-type sides'chain,these branched chains also suppress chain planarization and improve film morphological stability effectively.Interestingly,the branched polymer also had excellent stable amplified spontaneous emission(ASE)behaviour with low threshold(4.72μJ/cm2)and a center peak of 465 nm,even thermal annealing at 220℃in the air atmosphere.Therefore,side-chain branched strategy for LCPs is an effective means to control interchain aggregation,film morphology and photophysical property of LCPs. 展开更多
关键词 Light-emitting conjugated polymers Branched effect Aggregation behavior Robust deep-blue emission Efficient optoelectronic devices
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温度对脉冲涡流壁厚检测影响的实验研究 认领 引用
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作者 孙健 向安 来园凯 《智能城市应用》 2026年第8期86-89,共4页
温度变化会影响被测构件的磁导率和电导率,继而影响脉冲涡流信号特征,因此在不同温度下利用脉冲涡流技术检测得到的壁厚值会发生变化:温度越高检测得到的壁厚值越低。文中通过实验分析得到不同温度下脉冲涡流晚期信号斜率和计算壁厚与... 温度变化会影响被测构件的磁导率和电导率,继而影响脉冲涡流信号特征,因此在不同温度下利用脉冲涡流技术检测得到的壁厚值会发生变化:温度越高检测得到的壁厚值越低。文中通过实验分析得到不同温度下脉冲涡流晚期信号斜率和计算壁厚与温度的关系,并拟合得到不同温度下20#碳钢的壁厚校准公式。 展开更多
关键词 脉冲涡流 晚期信号斜率 壁厚校准
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Discussion on interface deformation and liquid breakup mechanism in vapor-liquid two-phase flow 认领 引用 被引量：1
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作者 安祥 董波 +1 位作者 张雅瑾 周训 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期321-328,共8页
The interface deformation and liquid breakup in vapor-liquid two-phase flow are ubiquitous in natural phenomena and industrial applications.It is crucial to understand the corresponding mechanism correctly.The droplet... The interface deformation and liquid breakup in vapor-liquid two-phase flow are ubiquitous in natural phenomena and industrial applications.It is crucial to understand the corresponding mechanism correctly.The droplet and liquid ligament dynamic behaviors are investigated in this work by simulating three benchmark cases through adopting a three-dimensional(3D)phase-field-based lattice Boltzmann model,and vapor-liquid phase interface deformation and liquid breakup mechanisms including the capillary instability and end-pinching mechanism are analyzed.The analysis results show that the capillary instability is the driving mechanism of the liquid breakup and the secondary droplet production at a large Weber number,which is different from the Rayleigh-Taylor instability and Kelvin-Helmholtz instability characterizing the vapor-liquid interface deformation.In addition,as another liquid breakup mechanism,the end-pinching mechanism,which describes the back-flow phenomenon of the liquid phase,works at each breakup point,thus resulting in capillary instability on the liquid phase structure.In essence,it is the fundamental mechanism for the liquid breakup and the immanent cause of capillary instability. 展开更多
关键词 liquid breakup lattice Boltzmann method capillary instability end-pinching mechanism
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病原体通用高效多表位疫苗设计开发平台的构建 认领 引用
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作者 王舒宁 李维娜 +6 位作者 张旺倩 杜海琛 刘丽君 向安 李萌 张英起 张存 《空军军医大学学报》 CAS 2025年第11期1465-1472,1480,共8页
目的 建立新发突发传染病病原体高效多表位疫苗设计开发平台,为快速设计和制备保护作用强、稳定性好、副作用低的疫苗提供保障。方法 通过对病原体多种亚型B细胞表位和T细胞表位的预测、筛选(HLA结合能力、免疫原性、抗原性、毒性、致... 目的 建立新发突发传染病病原体高效多表位疫苗设计开发平台,为快速设计和制备保护作用强、稳定性好、副作用低的疫苗提供保障。方法 通过对病原体多种亚型B细胞表位和T细胞表位的预测、筛选(HLA结合能力、免疫原性、抗原性、毒性、致敏性、保守性等)及优化,选择最具免疫保护潜力且相对保守的表位,设计针对病原体不同突变株的通用多表位组合疫苗。结果 该平台为集优势抗原表位预测、性质分析、HLA结合能力分析及多表位疫苗结构预测为一体的通用高效表位疫苗设计开发平台。仅需提供病原体抗原性蛋白的序列,根据机器学习算法即可得出打分由高到低的表位序列列表,并根据表位序列的性质进行筛选,将覆盖率高、免疫原性强、能针对多种突变株的优势抗原表位通过优化组合构建多表位候选疫苗。结论 该平台为多种病原体提供一个通用的疫苗研发平台,为快速设计和制备保护作用强、稳定性好、副作用低的疫苗提供保障。 展开更多
关键词 疫苗 表位 病原体 疫苗研发 计算生物学 免疫原性 人类白细胞抗原 蛋白结构预测
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Velocity distribution of flow with submerged flexible vegetations based on mixing-length approach 认领 引用 被引量：4
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作者 Wen-xin HUAI Jie HAN +2 位作者 Yu-hong ZENG Xiang AN Zhong-dong QIAN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2009年第3期343-351,共9页
By choosing a PVC slice to simulate flexible vegetation,we carried out experiments in an open channel with submerged flexible vegetation.A 3D acoustic Doppler velocimeter(micro ADV)was used to measure local flow veloc... By choosing a PVC slice to simulate flexible vegetation,we carried out experiments in an open channel with submerged flexible vegetation.A 3D acoustic Doppler velocimeter(micro ADV)was used to measure local flow velocities and Reynolds stress.The results show that hydraulic characteristics in non-vegetation and vegetation layers are totally different.In a region above the vegetation,Reynolds stress distribution is linear,and the measured velocity profile is a classical logarithmic one.Based on the concept of new-riverbed,the river compression parameter representing the impact of vegetation on river is given,and a new assumption of mixing length expression is made.The formula for time-averaged velocity derived from the expression requires less parameters and simple calculation,and is useful in applications. 展开更多
关键词 flexible vegetation PVC slice micro ADV mixing-length approach streamwise velocity distribution Reynolds stress river compression parameter
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Self-encapsulated light-emitting conjugated polymers with enhanced spectra aging stability for deep-blue polymer light-emitting diodes 认领 引用 被引量：1
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作者 Yamin Han Rui Gao +10 位作者 Qingqing Lu Lubing Bai Wenyu Chen Ning Sun Chuanxin Wei Xiang An Lili Sun Chen Sun Bin Liu Jinyi Lin Wei Huang 《InfoMat》 SCIE CSCD 2025年第12期93-103,共11页
Molecular-level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state.He... Molecular-level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state.Herein,by tuning the generation of dendritic carbazoles(Cz)in side chains,polydiarylfluorenes with efficient deep-blue emission have been successfully synthesized and explored.The nonplanar twisted Cz dendrons endow their photoluminescence(PL)spectra with enhanced air-aging stability and thermal stability owing to the formation of a self-encapsulation layer.Their impact on solutionstate chain conformation and aggregation was thoroughly studied,combining small-angle neutron scattering(SANS)and dynamic light scattering(DLS).Furthermore,benefiting from the suppressed intermolecular interactions,their films exhibit optimal behavior of singlet excitons in the excited state.Polymer light-emitting diodes(PLEDs)adopting the spin-coated and blade-coated films both present comparable properties and stable electroluminescence(EL)spectra,with Commission Internationale de L'Eclairage(CIE)coordinates(x+y)<0.3,demonstrating the feasibility of a self-encapsulated molecular design strategy. 展开更多
关键词 carbazole dendrons deep-blue polymer light-emitting diodes light-emitting conjugated polymer polydiarylfluorenes self-encapsulation
Universal 4-qualifiable fluorene-based building blocks for potential optoelectronic applications 认领 引用
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作者 Xiang An Jinghao Yang +11 位作者 Man Xu Lili Sun Lubing Bai Kai Wang Zhiqiang Zhuo Yingying Zheng Jinyi Lin Xuehua Ding Yuyu Liu Linghai Xie Chengrong Yin Wei Huang 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第12期5137-5141,共5页
In the design of conjugated molecules,modular production enables materials to easily realize structure modification and precisely tune their photoelectrical property.Construction of a novel and universal building bloc... In the design of conjugated molecules,modular production enables materials to easily realize structure modification and precisely tune their photoelectrical property.Construction of a novel and universal building block is crucial to design and manufacture high performance and stable conjugated molecules for optoelectronic application.Herein,we originally demonstrated a universal 4-qualifiable fluorene-based building block,which is a fundamental molecular segment to functionalize and obtain novel conjugated materials.Compared to the traditional modification at 9-site,additional 4-position functionalization provided an exciting blueprint to not only tune electronic structure and excited state via p-n molecular design engineering and space charge-transfer strategy,but also allow for optimizing intermolecular arrangement and obtaining solution-processing ability.The introduction of the 4-site substituent in fluorene based semiconductors may endow materials with unique properties.Finally,we successfully prepared two stable deep-blue light-emitting conjugated polymer,PODOPF and PODOF,by utilizing the 4-substituent fluorene based building block.It is believable that the performance,stability and processibility of reported outstanding fluorene-based conjugated molecules can be further optimized based on this universal building block. 展开更多
关键词 Side-chain coupling Small molecular emitter Morphological stability Deep-blue emission Optoelectronic device
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Multilayered PdTe2/thin Si heterostructures as self-powered flexible photodetectors with heart rate monitoring ability 认领 引用 被引量：3
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作者 Chengyun Dong Xiang An +4 位作者 Zhicheng Wu Zhiguo Zhu Chao Xie Jian-An Huang Linbao Luo 《Journal of Semiconductors》 EI CAS CSCD 2023年第11期42-51,共10页
Two-dimensional layered material/semiconductor heterostructures have emerged as a category of fascinating architectures for developing highly efficient and low-cost photodetection devices.Herein,we present the constru... Two-dimensional layered material/semiconductor heterostructures have emerged as a category of fascinating architectures for developing highly efficient and low-cost photodetection devices.Herein,we present the construction of a highly efficient flexible light detector operating in the visible-near infrared wavelength regime by integrating a PdTe2 multilayer on a thin Si film.A representative device achieves a good photoresponse performance at zero bias including a sizeable current on/off ratio exceeding 105,a decent responsivity of~343 mA/W,a respectable specific detectivity of~2.56×1012Jones,and a rapid response time of 4.5/379μs,under 730 nm light irradiation.The detector also displays an outstanding long-term air stability and operational durability.In addition,thanks to the excellent flexibility,the device can retain its prominent photodetection performance at various bending radii of curvature and upon hundreds of bending tests.Furthermore,the large responsivity and rapid response speed endow the photodetector with the ability to accurately probe heart rate,suggesting a possible application in the area of flexible and wearable health monitoring. 展开更多
关键词 2D layered material heterostructure flexible photodetector health monitoring
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手工电弧焊焊接线能量远程智能监测技术研究 认领 引用
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作者 李滢博 吉章红 +2 位作者 田亚团 向安 来园凯 《智能城市应用》 2025年第10期56-61,共6页
文章主要介绍了手工电弧焊“焊接线能量远程智能监测”技术研究情况。通过设置每一台手工焊电焊机对应的本地监测主机盒,用来收集电焊机对应的焊接线能量数据,并由监测主机内置的4G传输模块发送到远程服务器中。多个不同位置或地区的手... 文章主要介绍了手工电弧焊“焊接线能量远程智能监测”技术研究情况。通过设置每一台手工焊电焊机对应的本地监测主机盒,用来收集电焊机对应的焊接线能量数据,并由监测主机内置的4G传输模块发送到远程服务器中。多个不同位置或地区的手工焊的本地监测主机,与远程服务器进行匹配和传输。远程服务器中预设好焊接线能量阈值范围,当某个手工电焊机反馈过来的焊接线能量不在合理阈值内,则远程服务器进行报警,并传远程给对应的本地监测主机中,利用声光对现场人员进行提醒。经实验验证,该方法可以有效提高手工焊的焊接质量,并通过大数据分析,可以对诸多省区及不同位置的焊接行为进行汇总和研判。 展开更多
关键词 焊接速度 焊接线能量 远程智能监测 手工电弧焊
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基于脉冲涡流(瞬变电磁)技术的带包覆层压力管道壁厚检测研究 认领 引用 被引量：9
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作者 蔡勤 李继承 +3 位作者 戚政武 陈英红 向安 黄豹 《热加工工艺》 北大核心 2023年第2期21-26,共6页
采用脉冲涡流检测(瞬变电磁)技术对带包覆层的构件进行壁厚测量时,铝皮保护层会对脉冲涡流信号产生一定影响。以单对数坐标系中晚期信号直线段斜率作为表征被测构件壁厚的特征值,通过试验数据获得壁厚与特征值的拟合关系式。结果表明:... 采用脉冲涡流检测(瞬变电磁)技术对带包覆层的构件进行壁厚测量时,铝皮保护层会对脉冲涡流信号产生一定影响。以单对数坐标系中晚期信号直线段斜率作为表征被测构件壁厚的特征值,通过试验数据获得壁厚与特征值的拟合关系式。结果表明:铝皮保护层对测量结果的影响与被测构件的壁厚有很大关系,壁厚越薄,受影响越大。当壁厚大于6 mm时,铝皮保护层对测量结果影响较小;铝皮保护层越厚,对薄壁构件的影响越大,测量误差越大;当以单对数坐标系中晚期信号直线段斜率作为表征被测构件壁厚的特征值时,提离高度对测量结果影响不大。 展开更多
关键词 脉冲涡流 晚期信号斜率 铝皮保护层 提离高度
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创新教学模式翻转课堂在国外医学本科生教育中的应用现状 认领 引用 被引量：15
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作者 汪莉 向安 卢兹凡 《药物生物技术》 CAS 2019年第5期427-431,共5页
我国高等教育改革的目的就是要探索新的教学模式,提升创新人才培养水平。作为一种创新型的教学模式,翻转课堂愈来愈被全球广大教育工作者重视,众多高校教师积极参与到这一模式的探索和应用。然而,翻转课堂在高等医学教育尤其是我国的高... 我国高等教育改革的目的就是要探索新的教学模式,提升创新人才培养水平。作为一种创新型的教学模式,翻转课堂愈来愈被全球广大教育工作者重视,众多高校教师积极参与到这一模式的探索和应用。然而,翻转课堂在高等医学教育尤其是我国的高等医学教育中的研究及应用报道较少。文章通过检索、阅读Pub Med数据库中2012年6月至2018年12月之间发表的关于翻转课堂在医学本科生教育中的研究文献,对比、分析了翻转课堂相较于传统教学模式的特点,系统综述了国外尤其是发达国家翻转课堂的研究现状及应用效果,总结了医学教育工作者对这一教学模式的评价,并进一步探讨了目前翻转课堂在实践过程中仍然存在的不足,为进一步在国内医学教育中推行这种模式提供参考。 展开更多
关键词 医学教育 创新教学 翻转课堂 本科生 教学模式 教学改革
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基于病案数据挖掘定量结合定性研究周仲瑛教授辨治肝癌方案 认领 引用 被引量：6
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作者 张宾 相安 +2 位作者 邵臧杰 王盼盼 叶放 《浙江中医药大学学报》 CAS 2019年第6期562-565,共4页
[目的]基于病案数据挖掘定量结合定性总结周仲瑛教授辨治肝癌方案。[方法]通过整理周仲瑛教授辨治肝癌的病案,并结合数据挖掘和名医定性访谈的方法,对周仲瑛教授辨治肝癌病机特点、治则治法、临证方案加以总结。[结果]周仲瑛教授治疗肝... [目的]基于病案数据挖掘定量结合定性总结周仲瑛教授辨治肝癌方案。[方法]通过整理周仲瑛教授辨治肝癌的病案,并结合数据挖掘和名医定性访谈的方法,对周仲瑛教授辨治肝癌病机特点、治则治法、临证方案加以总结。[结果]周仲瑛教授治疗肝癌主要着眼于病机分析,认为肝癌的基本病机是湿热瘀毒互结,肝脾两伤。病理因素是以癌毒为核心,与湿、热、痰、瘀、郁等胶结复合为患。病理性质多属本虚标实,虚实夹杂。病位主要在肝脾,涉及胆、胃、肾、肺。病机演变,早期以湿热瘀毒内伏为主,中晚期癌毒暗耗气血,病机往往复杂多变。而治疗重在把握扶正祛邪的主次。临证常见7种复合证型为:湿热瘀毒郁结,癌毒内蕴,肝脾两伤证;湿热瘀毒郁结,肝胃失和,胃气上逆证;肝郁脾虚,湿热瘀毒互结证;肝肾阴虚,湿热瘀毒郁滞证;湿热瘀毒互结,络热血溢证;气阴两虚,湿热瘀毒互结证;肝脾两伤,土败木贼,气滞水停,湿热瘀毒未尽证。[结论]周仲瑛教授临证采用病机辨证方法,结合基本病机,围绕病机之间的兼夹、复合、转化及演变,因机立法,随证加减。所列出的7种常见复合证型及辨治方案涉及了肝癌病程的各个阶段。临床特色突出,改善了患者的生活质量,疗效肯定。其临证方案对中医药治疗肝癌具有借鉴意义和推广价值。 展开更多
关键词 湿热瘀毒 数据挖掘 病机 周仲瑛 肝癌 方案
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军队医学院校生物技术创新人才培养探索与实践 认领 引用 被引量：4
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作者 向安 汪钦 +2 位作者 汪莉 雷小英 卢兹凡 《药物生物技术》 CAS 2018年第5期423-427,共5页
创新是我国发展策略的迫切要求和推动国防建设之关键。现代生物技术是国家创新能力的重要体现,同时深刻影响着现代化国防的发展。文章阐述了现代生物技术发展与人才培养在创新型国家和国防建设中的作用;以美国为例分析了发达国家生物技... 创新是我国发展策略的迫切要求和推动国防建设之关键。现代生物技术是国家创新能力的重要体现,同时深刻影响着现代化国防的发展。文章阐述了现代生物技术发展与人才培养在创新型国家和国防建设中的作用;以美国为例分析了发达国家生物技术人才培养与创新教育以及我国生物技术发展与人才培养现状;总结了该单位通过优化生物技术专业本科生的《基因工程》课程内容,改革教学方法,调整评价体系等措施,初步形成了基础与前沿并重,特色内容突出的课程设置,以及注重实践能力和培养创新的教学模式,以达到提高学员创新能力与科学素养之目的。 展开更多
关键词 创新人才 人才培养 生物技术 创新教育 教学改革 教学实践
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便携式呼出气冷凝液采集装置的设计 认领 引用 被引量：1
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作者 向安 周磊 +9 位作者 纪奇峰 李远辙 汪钦 朱诗曼 彭婕 雷小英 李维娜 汪莉 郭晏海 卢兹凡 《医疗卫生装备》 CAS 2024年第8期32-37,共6页
目的:为满足人呼吸道(尤其下呼吸道)感染快速筛查的需要,研制一种基于自然呼吸方式的便携式呼出气冷凝液(exhaled breath condensate,EBC)采集装置。方法:该装置由制冷单元、散热单元和冷凝单元组成。制冷单元采用TES1-7102型Peltier效... 目的:为满足人呼吸道(尤其下呼吸道)感染快速筛查的需要,研制一种基于自然呼吸方式的便携式呼出气冷凝液(exhaled breath condensate,EBC)采集装置。方法:该装置由制冷单元、散热单元和冷凝单元组成。制冷单元采用TES1-7102型Peltier效应制冷半导体作为制冷元件;散热单元由高导热铝质散热片和高速无刷散热风扇组成;冷凝单元由导冷板和冷凝器组成,其中,导冷板为合金铝薄片,冷凝器采用3D打印技术制备,材质为疏水性聚乳酸,具有主、次2级导流槽以及超薄冷凝表面。为验证该装置的性能,进行制冷、导热和冷凝性能分析及人EBC采集和内容物分析。结果:制冷、导热和冷凝性能分析结果表明,开启制冷后,该装置的冷凝器表面温度与人呼出气的温差可达到冷凝所需温差,且冷凝表面未形成明显热阻,人呼出气在冷凝表面发生气-液相变后可快速形成较大液滴便于采集。人EBC采集及内容物分析结果表明,该装置可实现各个年龄段人群EBC的居家自采集,且采集的EBC样本中白细胞介素、C反应蛋白等炎症相关指标的浓度及pH值与受试者呼吸道感染相关。结论:该装置操作简单,可避免吹气式采集的不适感和唾液污染的风险,在呼吸道感染等相关疾病的快速诊疗和动态监测方面具有较好的应用价值。 展开更多
关键词 呼出气冷凝液 呼出气冷凝液采集装置 冷凝器 呼吸道感染
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精准医疗时代心血管药物个体化用药教学中PBL融合FC教学方法的探索 认领 引用 被引量：1
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作者 汪莉 向安 +3 位作者 翟东昇 郭晏海 李萌 卢兹凡 《心脏杂志》 CAS 2019年第5期610-613,共4页
目的探讨以问题为基础的学习(problem based learning,PBL)联合翻转课堂(flipped classroom,FC)教学方法在心血管疾病个体化用药教学中的应用。方法将学生随机分为试验组(PBL+FC教学法)和对照组(传统教学法),通过考核和问卷调查方式评... 目的探讨以问题为基础的学习(problem based learning,PBL)联合翻转课堂(flipped classroom,FC)教学方法在心血管疾病个体化用药教学中的应用。方法将学生随机分为试验组(PBL+FC教学法)和对照组(传统教学法),通过考核和问卷调查方式评价两种教学方法联合在心血管疾病个体化用药教学中的应用效果。结果试验组的成绩高于传统教学组(P<0.05)。与传统教学法相比,PBL+FC教学法能够增强学生学习兴趣,提高学生自主学习、分析解决问题能力。结论 PBL+FC教学方法优于传统教学法。 展开更多
关键词 心血管药物 个体化用药 以问题为基础的学习 翻转课堂
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一种兼具升降温功能的多阶宽程数字温控仪的设计与研制 认领 引用
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作者 向安 汪钦 +4 位作者 张文丽 宋贞洁 郭晏海 汪莉 卢兹凡 《现代仪器与医疗》 CAS 2022年第4期31-36,共6页
目的设计和研制一种兼具升降温功能的多阶宽程数字温控仪。方法采用独立数显温控模块对经纳米气凝胶隔热处理的TEC半导体制冷元件和PET柔性加热元件进行精准升降温控制和稳定维持。结果仪器可实现2℃至常温间两个温阶和常温至80℃间八... 目的设计和研制一种兼具升降温功能的多阶宽程数字温控仪。方法采用独立数显温控模块对经纳米气凝胶隔热处理的TEC半导体制冷元件和PET柔性加热元件进行精准升降温控制和稳定维持。结果仪器可实现2℃至常温间两个温阶和常温至80℃间八个温阶的精准调控,兼具致冷和加热双功能;制冷组平均降温速率νJ-BW=-0.55℃/min,精度±0.1℃;加热组平均升温速率νS-BW=+1.90℃/min,精度±0.2℃,邻近温差最高50℃。结论仪器能在较宽温程内同时实现多温阶的制冷和加热功能并稳定控制和维持,在提升相关科学研究和实验教学中具有重要意义。 展开更多
关键词 半导体制冷 PET加热 温度控制 隔热气凝胶
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基于脉冲涡流晚期信号斜率的不锈钢壁厚测量 认领 引用 被引量：5
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作者 田亚团 向安 来园凯 《无损检测》 CAS 2022年第3期18-21,31,共4页
分析了304不锈钢的脉冲涡流信号,以单对数坐标系下晚期信号的斜率作为表征壁厚的特征值,拟合出晚期信号斜率与不锈钢壁厚之间的关系式,并通过试验分析了提离高度、缺陷形状等对信号的影响。该方法已进行实践应用,效果良好。
关键词 脉冲涡流 晚期信号斜率 不锈钢壁厚测量
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基于双能X射线的液体危险品识别分类方法 认领 引用 被引量：5
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作者 胡紫薇 项安 陈奕杰 《无损检测》 CAS 2020年第9期63-68,共6页
受定位不准、容器影响因素的影响,X射线安检机在液体识别领域识别精度低。为了提高识别精度,基于X射线透射原理,提出了一种理想状态下基于双能X射线安检机的液体识别方法,并给出了高低能图像处理方法以获得准确的容器定位,利用支持向量... 受定位不准、容器影响因素的影响,X射线安检机在液体识别领域识别精度低。为了提高识别精度,基于X射线透射原理,提出了一种理想状态下基于双能X射线安检机的液体识别方法,并给出了高低能图像处理方法以获得准确的容器定位,利用支持向量机和逻辑回归模型对R值进行分类,解决了难以提取有效原子序数实现液体分类识别的问题,并通过仿真和试验验证了算法的可用性。 展开更多
关键词 双能X射线 安检机 液体识别
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Unveiling the Effects of Interchain Hydrogen Bonds on Solution Gelation and Mechanical Properties of Diarylfluorene-Based Semiconductor Polymers 认领 引用 被引量：12
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作者 Lubing Bai Yamin Han +15 位作者 Chen Sun Xiang An Chuanxin Wei Wei Liu Man Xu Lili Sun Ning Sun Mengna Yu He Zhang Qi Wei Chunxiang Xu Yingguo Yang Tianshi Qin Linghai Xie Jinyi Lin Wei Huang 《Research》 SCIE EI CSCD 2020年第1期547-561,共15页
The intrinsically rigid and limited strain of most conjugated polymers has encouraged us to optimize the extensible properties of conjugated polymers.Herein,learning from the hydrogen bonds in glucose,which were facil... The intrinsically rigid and limited strain of most conjugated polymers has encouraged us to optimize the extensible properties of conjugated polymers.Herein,learning from the hydrogen bonds in glucose,which were facilitated to the toughness enhancement of cellulose,we introduced interchain hydrogen bonds to polydiarylfluorene by amide-containing side chains.Through tuning the copolymerization ratio,we systematically investigated their influence on the hierarchical condensed structures,rheology behavior,tensile performances,and optoelectronic properties of conjugated polymers.Compared to the reference copolymers with a low ratio of amide units,copolymers with 30%and 40%amide units present a feature of the shearthinning process that resembled the non-Newtonian fluid,which was enabled by the interchain dynamic hydrogen bonds.Besides,we developed a practical and universal method for measuring the intrinsic mechanical properties of conjugated polymers.We demonstrated the significant impact of hydrogen bonds in solution gelation,material crystallization,and thin film stretchability.Impressively,the breaking elongation for P4 was even up to~30%,which confirmed the partially enhanced film ductility and toughness due to the increased amide groups.Furthermore,polymer light-emitting devices(PLEDs)based on these copolymers presented comparable performances and stable electroluminescence(EL).Thin films of these copolymers also exhibited random laser emission with the threshold as low as 0.52μJ/cm2,suggesting the wide prospective application in the field of flexible optoelectronic devices. 展开更多
关键词 bonds conjugated film
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