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Near infrared emissions from both high efficient quantum cutting (173%) and nearly-pure-color upconversion in NaY(WO_(4))_(2):Er^(3+)/Yb^(3+) with thermal management capability for silicon-based solar cells

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Light(Science & Applications) 2024年第1期13卷 113-126页

作者： Duan Gao Baojiu Chen Xuezhu Sha yuhang Zhang Xin Chen Li Wang Xizhen Zhang Jinsu Zhang Yongze Cao Yichao Wang Lei Li Xiangping Li Sai Xu hongquan yu Lihong Cheng School of Science Dalian Maritime UniversityDalian 116026 LiaoningChina

Raising photoelectric conversion efficiency and enhancing heat management are two critical concerns for siliconbased solar *** this work,efficient Yb^(3+) infrared emissions from both quantum cutting and upconversion were demonstrated by adjusting Er^(3+) and Yb^(3+) concentrations,and thermo-manage-applicable temperature sensing based on the luminescence intensity ratio of two super-low thermal quenching levels was discovered in an Er^(3+)/Yb^(3+) codoped tungstate *** quantum cutting mechanism was clearly decrypted as a two-step energy transfer process from Er^(3+) to Yb^(3+).The two-step energy transfer efficiencies,the radiative and nonradiative transition rates of all interested 4 f levels of Er^(3+) in NaY(WO_(4))_(2) were confirmed in the framework of Föster-Dexter theory,Judd-Ofelt theory,and energy gap law,and based on these obtained efficiencies and rates the quantum cutting efficiency was furthermore determined to be as high as 173%in NaY(WO_(4))_(2):5 mol%Er^(3+)/50 mol%Yb^(3+) *** and nearly pure infrared upconversion emission of Yb3+under 1550 nm excitation was achieved in Er^(3+)/Yb^(3+)co-doped NaY(WO_(4))_(2) by adjusting Yb^(3+) doping *** Yb^(3+) induced infrared upconversion emission enhancement was attributed to the efficient energy transfer ^(4)I_(11/2)(Er^(3+))+^(2)F_(7/2)(Yb^(3+))→^(4)I_(15/2)(Er^(3+))+^(2)F_(5/2)(Yb^(3+))and large nonradiative relaxation rate of ^(4)I_(9/2).Analysis on the temperature sensing indicated that the NaY(WO_(4))_(2):Er^(3+)/Yb^(3+)serves well the solar cells as thermos-managing ***,it was confirmed that the fluorescence thermal quenching of ^(2)H_(11/2)/^(4)S_(3/2) was caused by the nonradiative relaxation of ^(4)S_(3/2).All the obtained results suggest that NaY(WO_(4))_(2):Er^(3+)/Yb^(3+) is an excellent material for silicon-based solar cells to improve photoelectric conversion efficiency and thermal management.

关键词： quantum thermal relaxation

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通用转录因子2I在胶质母细胞瘤替莫唑胺化疗抵抗中的作用

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吉林大学学报（医学版） 2024年第2期50卷 457-464页

作者：周建国姜红建朱其辉张耿强邓琪琳齐玲李凯舒于洪泉吉林大学第一医院神经肿瘤外科吉林长春130021 广州医科大学附属清远医院神经外科广东清远511518

目的:探讨通用转录因子2I(GTF2I)在胶质母细胞瘤(GBM)替莫唑胺化疗抵抗中的作用,并阐明其作用机制。方法:基于转录因子预测网站(PROMO网站),生物信息学分析GBM组织中甲基转移酶1(DNMT1)、损伤特异性DNA结合蛋白1(DDB1)、染色盒同源物5(C... 详细信息

目的:探讨通用转录因子2I(GTF2I)在胶质母细胞瘤(GBM)替莫唑胺化疗抵抗中的作用,并阐明其作用机制。方法:基于转录因子预测网站(PROMO网站),生物信息学分析GBM组织中甲基转移酶1(DNMT1)、损伤特异性DNA结合蛋白1(DDB1)、染色盒同源物5(CBX5)和着色性干皮病基因组C(XPC)的共同转录因子,并基于癌症基因组图谱(TCGA)数据库进行DDB1、CBX5、XPC和DNMT1与GTF2I和甲基鸟嘌呤甲基转移酶(MGMT)的相关性分析及生存分析。分别用小干扰序列(siRNA)转染并沉默人脑多形性成胶质细胞瘤T98细胞和人脑胶质瘤LN229细胞中MGMT及GTF2I的基因表达,采用实时荧光定量PCR(RT-qPCR)法检测上述基因的mRNA表达水平。沉默GTF2I基因后,平板克隆形成实验检测肿瘤细胞的集落形成能力,CCK-8法检测细胞对替莫唑胺的敏感性。结果:生物信息学分析,GBM组织中DDB1、CBX5、XPC和DNMT1表达水平与GTF2I表达水平呈显著正相关关系(P<0.05),与MGMT表达水平呈负相关关系(P<0.05);GTF2I表达水平与MGMT表达水平呈显著负相关关系(P<0.05)。剔除未接受替莫唑胺治疗的GBM患者的生存分析,GTF2I高表达的患者总体生存时间降低。沉默MGMT基因后,人脑胶质瘤T98细胞中GTF2I、DDB1、CBX5和XPC mRNA表达水平升高(P<0.001);沉默GTF2I基因后,人脑胶质瘤LN229细胞中MGMT mRNA表达水平升高(P<0.05),而DDB1、CBX5、XPC和DNMT1 mRNA表达水平明显降低(P<0.05或P<0.001)。平板克隆形成实验,沉默GTF2I基因前后,细胞集落形成能力比较差异无统计学意义(P=0.138);CCK-8法检测,与对照组比较,观察组细胞活力明显降低(P<0.05)。结论:转录因子GTF2I可以调控MGMT、DDB1、CBX5和XPC等关键DNA损伤修复蛋白的mRNA表达,参与GBM细胞替莫唑胺化疗抵抗,可能是GBM潜在的治疗新靶点。

关键词：胶质母细胞瘤替莫唑胺抵抗通用转录因子2I 甲基鸟嘌呤甲基转移酶关键DNA损伤修复基因

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Effects of Bi^(3+) on down-/up-conversion luminescence,temperature sensing and optical transition properties of Bi^(3+)/Er^(3+)co-doped YNbO_(4) phosphors

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Journal of Rare Earths 2022年第3期40卷 381-389,I0001页

作者： Xin Wang Xiangping Li hongquan yu Sai Xu Jiashi Sun Lihong Cheng Xizhen Zhang Jinsu Zhang Yongze Cao Baojiu Chen School of Science Dalian Maritime UniversityDalian 116026China

A series of YNbO_(4):Bi^(3+) and YNbO_(4):Bi^(3+)/Er^(3+) phosphors were prepared by a conventional high temperature solid-state reaction *** results of XRD and Rietveld refinement confirm that monoclinic phase YNbO_(4)samples are *** down-/up-conversion luminescence of Er^(3+) ions was investigated under the excitation of ultraviolet light(327 nm)and near infrared light(980 nm).Under 327 nm excitation,broad visible emission band from Bi^(3+) ions and characteristic green emission peaks from Er^(3+) ions are simultaneously observed,while only strong green emissions from Er^(3+) ions are detected upon excitation of 980 *** emission enhancement is observed in down-/up-conversion luminescence processes by introducing Bi^(3+) ions into Er^(3+)-doped YNbO_(4)*** current versus up-conversion emission intensity study shows that two-photon processes are responsible for both the green and the red up-conversion emissions of Er^(3+)*** the study of the temperature sensing property of Er^(3+) ion,it is affirmed that the temperature sensitivity is sensitive to the doping concentration of Bi^(3+) *** comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er^(3+) ions and the theoretical values calculated by Judd-Ofelt(J-O)theory,it is concluded that the temperature sensing property of Er^(3+) ions is greatly affected by the energy level splitting.

关键词： YNbO_(4):Bi^(3+)/Er^(3+) Down-conversion luminescence Up-conversion luminescence Temperature sensing Rare earths

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岩石三维非线性黏弹塑性损伤蠕变模型研究

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河北工程大学学报（自然科学版） 2024年第2期41卷 36-42页

作者：虎积元盛冬发陈泰聪李子恒俞红全西南林业大学土木工程学院云南昆明650224

为了准确描述岩石蠕变曲线的各阶段特征,将Kelvin模型中黏壶元件的黏滞系数定义为与时间相关的函数,并根据蠕变损伤理论构建了一个考虑蠕变参数随时间劣化的损伤黏弹塑性体,进而将弹性体、非线性Kelvin体、黏性体和损伤黏弹塑性体进行串... 详细信息

为了准确描述岩石蠕变曲线的各阶段特征,将Kelvin模型中黏壶元件的黏滞系数定义为与时间相关的函数,并根据蠕变损伤理论构建了一个考虑蠕变参数随时间劣化的损伤黏弹塑性体,进而将弹性体、非线性Kelvin体、黏性体和损伤黏弹塑性体进行串联,提出了可以描述岩石蠕变全过程的非线性黏弹塑性损伤蠕变模型,并合理推导了该模型在恒应力情况下的一维和三维蠕变方程。最后,根据相关蠕变试验数据进行参数识别来验证损伤蠕变模型的有效性,对比分析理论模型和试验数据的相关性,结果表明该模型能很好地描述岩石蠕变全过程,且相关系数均在0.92以上。

关键词：岩石蠕变损伤非线性黏滞系数黏弹塑性

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PCAF-mediated acetylation of METTL3 impairs mRNA translation efficiency in response to oxidative stress

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Science China Life Sciences 2024年第10期67卷 2157-2168页

作者： Cheng Liu Miao yu Mengyuan Wang Siyuan Yang Yenan Fu Lei Zhang Chaoyang Zhu hongquan Zhang Program for Cancer and Cell Biology Department of Human AnatomyHistology and EmbryologySchool of Basic Medical SciencesPeking University International Cancer Instituteand State Key Laboratory of Molecular OncologyPeking University Health Science Center Department of General Surgery and Urological Surgery Huaihe HospitalHenan University Department of Human Anatomy Histologyand EmbryologyShenzhen University School of Medicine

METTL3 methylates RNA and regulates the fate of mRNA through its methyltransferase activity. METTL3 enhances RNA translation independently of its catalytic activity. However, the underlying mechanism is still elusive. Here, we report that METTL3 is both interacted with and acetylated at lysine 177 by the acetyltransferase PCAF and deacetylated by SIRT3. Neither the methyltransferase activity nor the stability of METTL3 is affected by its acetylation at K177. Importantly, acetylation of METTL3 blocks its interaction with EIF3H, a subunit of the translation initiation factor, thereby reducing mRNA translation efficiency. Interestingly, acetylation of METTL3 responds to oxidative stress. Mechanistically, oxidative stress enhances the interaction of PCAF with METTL3, increases METTL3 acetylation, and suppresses the interaction of METTL3 with EIF3H, thereby decreasing the translation efficiency of ribosomes and inhibiting cell proliferation. Altogether,we suggest a mechanism by which oxidative stress regulates RNA translation efficiency by the modulation of METTL3 acetylation mediated by PCAF.

关键词： METTL3 acetylation PCAF m6A oxidative stress translation SIRT3

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A　UNIFIED　APPROACH　TO　A　CLASS　OF　STIRLING-TYPE　PAIRS

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Applied Mathematics:A Journal of Chinese Universities 1997年第2期 101-108页

作者： XU LIZHI (L.C. HSU) AND yu hongquan

ＡＵＮＩＦＩＥＤＡＰＰＲＯＡＣＨＴＯＡＣＬＡＳＳＯＦＳＴＩＲＬＩＮＧ┐ＴＹＰＥＰＡＩＲＳＸＵＬＩＺＨＩ（Ｌ．Ｃ．ＨＳＵ）ＡＮＤＹＵＨＯＮＧＱＵＡＮＡｂｓｔｒａｃｔ．Ｈｅｒｅｐｒｅｓｅｎｔｅｄｉｓａｕｎｉｆｉｅｄａｐ... 详细信息

ＡＵＮＩＦＩＥＤＡＰＰＲＯＡＣＨＴＯＡＣＬＡＳＳＯＦＳＴＩＲＬＩＮＧ┐ＴＹＰＥＰＡＩＲＳＸＵＬＩＺＨＩ（Ｌ．Ｃ．ＨＳＵ）ＡＮＤＹＵＨＯＮＧＱＵＡＮＡｂｓｔｒａｃｔ．Ｈｅｒｅｐｒｅｓｅｎｔｅｄｉｓａｕｎｉｆｉｅｄａｐｐｒｏａｃｈｔｏａｗｉｄｅｃｌａｓ...

关键词： CLASS APPROACH OF PAIRS STIRLING-TYPE TO UNIFIED

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Electrospinning preparation and characterization of polyoxometalate fibers

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Chinese Science Bulletin 2006年第8期51卷 906-910页

作者： yu hongquan PENG Jun GUAN Hongyu XIN Zhifeng PAN Yan GONG Jian SHAO Changlu DONG Baoxia Faculty of Chemistry Northeast Normal University Changchun 130024 China Faculty of Physics Northeast Normal University Changchun 130024 China

Poly(vinyl alcohol)/K7[SiW11O39Co(H3P2- O7)] hybrid fine fiber mats (PVA/SiW11Co-P2O7) were prepared through electrospinning technique. After calcinations of PVA/SiW11Co-P2O7 at 500℃ for 8 h, pure SiW11Co-P2O7 fine fibers were obtained with the Keggin structure keeping unchanged. The fiber mats were characterized by IR, ESR, PXRD and scanning electron microscopy (SEM) methods. The average diameter of the fibers is about 250 nm. The SiW11Co- P2O7 fibers showed color change when absorbing and desorbing moisture.

关键词：乳酸光纤电子自旋 PVA SiW11Co-P2O7 制备 SEM 乙烯醇

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ConcerningWeightedStirling－typePairs

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Journal of Mathematical Research with Applications 1995年第4期 517-518页

作者： C. Hsu yu hongquan(Dalian University of Technologry, Dalian 116024)

ＣｏｎｃｅｒｎｉｎｇＷｅｉｇｈｔｅｄＳｔｉｒｌｉｎｇ－ｔｙｐｅＰａｉｒｓＬｅｅｔｓｃｈＣ．ＨｓｕＹｕＨｏｎｇｑｕａｎ（ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｒｙ，Ｄａｌｉａｎ１１６０２４）Ｃｏｎｃｅｒ...

ＣｏｎｃｅｒｎｉｎｇＷｅｉｇｈｔｅｄＳｔｉｒｌｉｎｇ－ｔｙｐｅＰａｉｒｓＬｅｅｔｓｃｈＣ．ＨｓｕＹｕＨｏｎｇｑｕａｎ（ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｒｙ，Ｄａｌｉａｎ１１６０２４）ＣｏｎｃｅｒｎｉｎｇＷｅｉｇｈｔｅｄＳｔｉｒｌ...

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Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

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多阶段堆叠融合下的敦煌壁画修复

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电子科技大学学报 2024年第4期53卷 551-559页

作者：邬开俊单宏全田彬俞天秀周颜林兰州交通大学电子与信息工程学院兰州730070 敦煌研究院文物数字化研究所敦煌730030

为解决敦煌破损壁画修复难的问题,提出一种多阶段堆叠融合下的壁画修复模型,在第一阶段进行粗修复以及最大化地进行所需特征信息的提取时采用Unet结构,为增强该阶段的修复效果,又加入对抗网络(LsGan);在第二阶段进行精细化修复,主要修... 详细信息

为解决敦煌破损壁画修复难的问题,提出一种多阶段堆叠融合下的壁画修复模型,在第一阶段进行粗修复以及最大化地进行所需特征信息的提取时采用Unet结构,为增强该阶段的修复效果,又加入对抗网络(LsGan);在第二阶段进行精细化修复,主要修复纹理以及细化遮挡区域,引入多头连接和多尺度分支堆叠模块并对其进行改进,对壁画进行多阶段信息提取并对其进行融合;最后为了修复全局细节,采用大感受野的编解码器结构并且引入轻量级通用可视化(Mobile ViT)模块,同时分离了壁画图像的通道并进行分析,引入对通道不敏感的极化注意力。实验结果表明,该模型很好地解决了壁画纹理以及细节修复的难题,相较于所选修复算法最优数据,在掩码面积为5%~20%时,峰值信噪比提高了3.312,在掩码面积为5%~80%时,平均峰值信噪比提高了1.02。

关键词：敦煌壁画修复多阶段堆叠大感受野多头嵌套多分支融合

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