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Enhanced piecewise regression based on deterministic annealing

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Science in China(Series F) 2008年第8期51卷 1025-1038页

作者： ZHANG JiangShe yang yuqian CHEN XiaoWen ZHOU ChengHu Institute for Information and System Sciences Faculty of Sciences Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Resources & Environmental Information System Institute of Geography Chinese Academy of Sciences Beijing 100101 China

Regression is one of the important problems in statistical learning theory. This paper proves the global convergence of the piecewise regression algorithm based on deterministic annealing and continuity of global minimum of free energy w.r.t temperature, and derives a new simplified formula to compute the initial critical temperature. A new enhanced plecewise regression algorithm by using ＂migration of prototypes＂ is proposed to eliminate ＂empty cell＂ in the annealing process. Numerical experiments on several benchmark datasets show that the new algorithm can remove redundancy and improve generalization of the piecewise regression model.

关键词： statistical regression piecewise regression deterministic annealing generalization

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基于微纳技术的铂类药物检测研究进展

分析仪器 2025年第1期 1-8页

作者：杨雨倩黄小凤青琳森梁健谢静成都医学院药学院结构特异性小分子药物研究四川省高等学校重点实验室成都610500 中国科学院成都生物研究所成都610213

高效、准确、低消耗地检测铂类药物对于癌症治疗和保障人民的生命健康具有重大意义。近年来,随着材料科学、电化学和微型化技术的发展,微流控技术和纳米材料在铂类药物检测中的新应用逐渐增加。不少研究者们通过对微流控技术和纳米材料... 详细信息

高效、准确、低消耗地检测铂类药物对于癌症治疗和保障人民的生命健康具有重大意义。近年来,随着材料科学、电化学和微型化技术的发展,微流控技术和纳米材料在铂类药物检测中的新应用逐渐增加。不少研究者们通过对微流控技术和纳米材料的合理应用,设计出了多种技术方法用于铂类药物的检测当中。与传统的铂类药物检测技术相比之下,微纳技术优势突出,具有高通量、高精准度、低消耗等优点。本文对微纳技术检测铂类药物的应用进行了全面综述,以期为铂类药物的检测提供研究思路,促进微纳技术在铂类药物检测中的发展,提高对癌症的治疗和控制能力。

关键词：铂类微流控纳米芯片检测

Chromium trioxide modified spiro-OMeTAD for highly efficient and stable planar perovskite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 386-394,I0011页

作者： Xiaobing Wang Jihuai Wu yuqian yang Guodong Li Zeyu Song Xuping Liu Weihai Sun Zhang Lan Peng Gao Engineering Research Centre of Environment-Friendly Functional Materials Ministry of Education/Fujian Engineering Research Centre of Green Functional MaterialsHuaqiao UniversityXiamen 361021FujianChina Fujian Institute of Research on Structure Matter Chinese Academy ScienceCASXiamen 361021FujianChina

Hole transporting materials(HTMs)play an unparalleled role in heightening the stability and photovoltaic performance of perovskite solar cells(PSCs).The organic small molecule spiro-OMeTAD is frequently utilized for HTM in ***,the raw spiro-OMeTAD without dopant would be harmful to the development of highly efficient PSCs,due to its unsatisfied hole mobility and ***,we introduce an inorganic dopant(chromium trioxide,CrO_(3))into the lithium-salt doped *** of the exclamatory oxidizability of CrO_(3),it can accelerate the oxidation of spiro-OMeTAD and thereby enhancing the hole mobility of *** introduction of CrO_(3) not only substantially decreases the density of defects,but also adjusts spiro-OMeTAD energy band,and thus effectively suppresses the hysteresis and improving stability of *** the end,we obtained a power conversion efficiency(PCE)as high as 22.6%after doping CrO_(3) in *** facile,low cost and outstanding photovoltaic performance render CrO_(3) an excellent dopant for HTMs in PSCs.

关键词： Perovskite solar cells Spiro-OMeTAD Hole transporting materials CrO_(3)

Design and aligner-assisted fast fabrication of a microfluidic platform for quasi-3D cell studies on an elastic polymer

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Bioactive Materials 2022年第9期7卷 288-304页

作者： Yingning He Yue Yu yuqian yang Yexin Gu Tianjiao Mao yang Shen Qiong Liu Ruili Liu Jiandong Ding State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200438China Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s HospitalSchool of MedicineTongji UniversityShanghai200434China

While most studies of mechanical stimulation of cells are focused on two-dimensional(2D)and three-dimensional(3D)systems,it is rare to study the effects of cyclic stretching on cells under a quasi-3D microenvironment as a linkage between 2D and ***,we report a new method to prepare an elastic membrane with topographic microstructures and integrate the membrane into a microfluidic *** fabrication difficulty lay not only in the preparation of microstructures but also in the alignment and bonding of the patterned membrane to other *** resolve the problem,we designed and assembled a fast aligner that is cost-effective and convenient to *** enable quasi-3D microenvironment of cells,we fabricated polydimethylsiloxane(PDMS)microwell arrays(formed by micropillars of a few microns in diameter)with the microwell diameters close to the cell *** appropriate plasma treatment was found to afford a coating-free approach to enable cell adhesion on *** examined three types of cells in 2D,quasi-3D,and 3D microenvironments;the cell adhesion results showed that quasi-3D cells behaved between 2D and 3D *** also constructed transgenic human mesenchymal stem cells(hMSCs);under cyclic stretching,the visualizable live hMSCs in microwells were found to orientate differently from in a 3D Matrigel matrix and migrate differently from on a 2D flat *** study not only provides valuable tools for microfabrication of a microfluidic device for cell studies,but also inspires further studies of the topological effects of biomaterials on cells.

关键词： Microfluidic chip Biomaterials Cell-material interaction Polymer Cell stretching

High-Performance and Hysteresis-Free Perovskite Solar Cells Based on Rare-Earth-Doped SnO_(2) Mesoporous Scaffold

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Research 2019年第1期2019卷 378-390页

作者： Qiyao Guo Jihuai Wu yuqian yang Xuping Liu Zhang Lan Jianming Lin Miaoliang Huang Yuelin Wei Jia Dong Jinbiao Jia Yunfang Huang Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityXiamen 361021China School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Chemical Engineering Huaqiao UniversityXiamen 361021China

Tin oxide(SnO_(2)),as electron transport material to substitute titanium oxide(TiO_(2))in perovskite solar cells(PSCs),has aroused wide ***,the performance of the PSCs based on SnO_(2) is still hard to compete with the TiO_(2)-based ***,a novel strategy is designed to enhance the photovoltaic performance and long-term stability of PSCs by integrating rare-earth ions Ln^(3+)(Sc^(3+),Y^(3+),La^(3+))with SnO_(2) nanospheres as mesoporous *** doping of Ln promotes the formation of dense and large-sized perovskite crystals,which facilitate interfacial contact of electron transport layer/perovskite layer and improve charge transport *** dopant optimizes the energy level of perovskite layer,reduces the charge transport resistance,and mitigates the trap state *** a result,the optimized mesoporous PSC achieves a champion power conversion efficiency(PCE)of 20.63%without hysteresis,while the undoped PSC obtains an efficiency of 19.01%.The investigation demonstrates that the rare-earth doping is low-cost and effective method to improve the photovoltaic performance of SnO_(2)-based PSCs.

关键词： density. perovskite doping

Exploring the anti-aging effects of chlorogenic acid and the underlying mechanisms based on a Caenorhabditis elegans model

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Journal of Traditional Chinese Medical Sciences 2023年第2期10卷 208-217页

作者： yuqian yang Xu Chen Danyang Ye Chuanyu Wei Xinxin Pang Chuchu Kong Yongsheng Fang Hongliu yang Yuanyuan Zhang Yonggang Liu School of Chinese Materia Madica Beijing University of Chinese MedicineBeijing102488China Krannert Institute of Cardiology Indiana UniversityBurmingtonIndiana46517USA

Objective:To explore the anti-aging effects of chlorogenic acid(CGA)and the underlying mechanisms based on a Caenorhabditis elegans(***)***:The anti-agingactivityofCGAwasstudied basedon thebodylength,exercisebehavior,lipofuscin content,antioxidative stress ability,swallowing frequency,body-bending frequency,and head-swinging ability of *** DAF-16 nuclear translocation and SOD-3-GFP fluorescence experiments,the effects of CGA on ROS levels,antioxidant enzyme activities,MDA content,mutant-strain lifespan,and anti-aging molecular signaling pathways were explored,as well as the underlying ***:CGA improved multiple indices of the nematode:body length was increased(all P<0.001),head-swing frequency and body-bending frequency were increased(all P<0.05),nematode longevity was prolonged(P=0.0021),lipofuscin deposition in nematodes was slowed down(all P<0.001),the chemotaxis index was improved(P=0.0012),ROS levels were reduced(all P<.001),and SOD activity and MDA content were reduced(SOD:P=0.0017 between the low-concentration group and the control group,P<.001 between the high-concentration and medium-concentration groups and the control group;MDA:P=0.0135 between the low-concentration group and the control group,and P<0.001 between the high-concentration and medium-concentration groups and the control group).In addition,CGA also activated the DAF-16 transcription factor,promoted DAF-16 nuclear translocation under oxidative stress conditions(both P<0.001 between the high-concentration and medium-concentration groups and the control group),and increased SOD-3 gene expression in nematodes(all P<0.001).Conclusion:CGA plays an anti-aging role in *** underlying mechanisms include activation of the insulin/IGF-1 signaling pathway and enhancement of DAF-16 *** study lays a foundation for further research into the anti-aging effects of CGA.

关键词： Chlorogenic acid Caenorhabditis elegans Antioxidant activity Anti-aging DAF-16

Tuning energy levels for high VOC in halide perovskite solar cells

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Tuning energy levels for high VOC in halide perovskite solar...

第九届新型太阳能材料科学与技术学术研讨会

作者： yuqian yang Jihuai Wu Qin Hu University of science and Technology of China School of Microelectronics

Hybrid halide perovskites hold great potential for next-generation solar cells. However, the PCE for relevant single junction devices is far away from the Shockley-Queisser limit [1-3]. Here, we tune energy levels via inducing alteration of lead-halogen bonds(Pb-I) for enhancement of open-circuit voltage(V) in triple-cation(Cs-MA-FA) perovskite solar cells. The extent of Pb-I orbital overlap relies on specific electronic environment around the lattice [4]. A phosphate salt can anchor on the perovskite lattice via coordinate with lead, which induces energy level shifts by increasing of Pb-I orbital overlap. Moreover, its functional groups further maintain the octahedral structure due to the conjugation and delocalization property. The optimized PSC exhibited power conversion efficiency of 22.8% with high open-circuit voltage(1.21 V), which maintained >80% of their initial value after 1000 hours in the dark under ambient condition.

关键词： perovskite solar cells energy level metal-halide bond open circuit voltage

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教育数字化转型的空间正义逻辑与发展路向

教育研究 2024年第6期45卷 148-159页

作者：徐小容杨雨倩西南大学教育学部重庆400715

随着教育数字化转型的深入推进,学校间、城乡间和区域间因资源禀赋及转型过程差异,形成了教育数字化非均衡发展的空间分异格局,引发了空间非正义难题。空间正义既是对地理不平衡发展的正义性思考,也是对主体空间权益的正义性维护,为教... 详细信息

随着教育数字化转型的深入推进,学校间、城乡间和区域间因资源禀赋及转型过程差异,形成了教育数字化非均衡发展的空间分异格局,引发了空间非正义难题。空间正义既是对地理不平衡发展的正义性思考,也是对主体空间权益的正义性维护,为教育数字化转型的空间思考提供了理论分析工具。空间正义与教育数字化转型的耦合,应考虑学校间、城乡间和区域间教育数字化转型的空间差异与发展差距,从校际教育数字均衡化、城乡教育数字一体化和区域教育数字圈层化确立空间正义的逻辑遵循;从高效与公平、均衡与差异、共建与共享关系解析教育数字化在空间生产正义、空间分配正义和空间消费正义的发展向度,有效确保各空间主体在教育数字化转型上的有序组合与和谐互动。破解教育数字化转型空间非正义难题,离不开实践维度的规划与调整,可从空间感知正义、空间实质正义、空间形式正义和空间程序正义四个方面探寻教育数字化转型的推进路径,开拓教育数字化转型均衡、正义的空间图景。

关键词：教育数字化转型空间正义校际均衡化城乡一体化区域圈层化

脱嵌与互嵌:职业教育产教融合的信息失衡与对称机制建构研究

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高等工程教育研究 2023年第6期 144-151页

作者：徐小容杨雨倩西南大学西南民族教育与研究中心、教育学部西南大学教育学部

产教融合的推进需要发挥信息在产业系统和职业教育系统间的媒介作用,使各利益主体在要素、主体和空间维达成共识,从而深化产教间的信息关联程度。但信息失衡是导致产教难以深度融合的莫大阻力,主要以产教间信息传播关系不对等、信息传... 详细信息

产教融合的推进需要发挥信息在产业系统和职业教育系统间的媒介作用,使各利益主体在要素、主体和空间维达成共识,从而深化产教间的信息关联程度。但信息失衡是导致产教难以深度融合的莫大阻力,主要以产教间信息传播关系不对等、信息传导路径单向依附、信息甄别能力受限和信息加工实效不显等为表征。为消除信息失衡所诱发的负面影响,有必要构建产教融合信息不对称纠偏模型,对照信息传受流程及时反馈和纠正,并从信息对话、监管、传递和动力机制入手,拓宽主体对话渠道、推行信息公开制度、维持信息流通秩序、营造产教协作信息生态,促使产教深度嵌合以规避信息不对称的风险。

关键词：职业教育产教融合信息勾连信息不对称信息纠偏