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比较任务修正少样本细粒度情感分类方法

计算机工程与设计 2024年第11期45卷 3420-3426页

作者：金旭崔艳荣陈杰陈佳力长江大学计算机科学学院湖北荆州434023

针对主流少样本学习方法在细粒度情感分类任务中难以区分情感程度相似样本的问题,提出一种基于比较任务的少样本细粒度文本情感分类的修正方法。对于比较任务的训练阶段,构建训练集样本的正负样本并设计一套比较任务模板。在比较任务的... 详细信息

针对主流少样本学习方法在细粒度情感分类任务中难以区分情感程度相似样本的问题,提出一种基于比较任务的少样本细粒度文本情感分类的修正方法。对于比较任务的训练阶段,构建训练集样本的正负样本并设计一套比较任务模板。在比较任务的预测阶段设计一种将测试集样本与训练集样本情感程度比较结果进行投票分类的方法。利用比较任务的结果对单句分类结果进行修正,取得更稳定的结果。在细粒度情感分类数据集SST5及Amazon Product数据集上进行实验,结果表明,修正方法相较于主流方法获得更优的性能与稳定性。

关键词：细粒度情感分类少样本比较任务修正方法自然语言处理文本分类

PI3K/AKT signaling and neuroprotection in ischemic stroke:molecular mechanisms and therapeutic perspectives

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Neural Regeneration Research 2025年第10期20卷 2758-2775页

作者： Tianlong liu Xiaolin li Xiaowei Zhou Wei chen Aidong Wen Minna liu Yi Ding Department of Pharmacy Xijing HospitalFourth Military Medical UniversityXi’anShaanxi ProvinceChina Department of Pharmacy The 940 Hospital of Joint Logistics Support Forces of Chinese PLALanzhouGansu ProvinceChina Department of Pharmacy The 944 Hospital of Joint Logistics Support Forces of Chinese PLAJiuquanGansu ProvinceChina Department of Nephrology The 940 Hospital of Joint Logistics Support Forces of Chinese PLALanzhouGansu ProvinceChina

It has been reported that the PI3K/AKT signaling pathway plays a key role in the pathogenesis of ischemic *** a result,the development of drugs targeting the PI3K/AKT signaling pathway has attracted increasing attention from *** article reviews the pathological mechanisms and advancements in research related to the signaling pathways in ischemic stroke,with a focus on the PI3K/AKT signaling *** key findings include the following:(1)The complex pathological mechanisms of ischemic stroke can be categorized into five major types:excitatory amino acid toxicity,Ca^(2+)overload,inflammatory response,oxidative stress,and apoptosis.(2)The PI3K/AKT-mediated signaling pathway is closely associated with the occurrence and progression of ischemic stroke,which primarily involves the NF-κB,NRF2,BCL-2,mTOR,and endothelial NOS signaling pathways.(3)Natural products,including flavonoids,quinones,alkaloids,phenylpropanoids,phenols,terpenoids,and iridoids,show great potential as candidate substances for the development of innovative anti-stroke medications.(4)Recently,novel therapeutic techniques,such as electroacupuncture and mesenchymal stem cell therapy,have demonstrated the potential to improve stroke outcomes by activating the PI3K/AKT signaling pathway,providing new possibilities for the treatment and rehabilitation of patients with ischemic *** investigations should focus on the direct regulatory mechanisms of drugs targeting the PI3K/AKT signaling pathway and their clinical translation to develop innovative treatment strategies for ischemic stroke.

关键词： apoptosis autophagy inflammation ischemic stroke neuroprotection oxidative stress pathogenesis phosphatidylinositol 3-kinase protein kinase B therapeutics

li,Na,and Cs-based metal-organic frameworks for room temperature phosphorescence applications

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Science China Chemistry 2025年

作者： jiaqi Ma Rui Feng Yanyuan jia Mingshi Zhang Shuo Guo College of Chemistry and Chemical Engineering Inner Mongolia University School of Materials Science and Engineering Smart Sensing Interdisciplinary Science Center Nankai University & TKL of Metal and Molecule Based Material Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Department of Chemistry and Biochemistry University of California San Diego

The conventional design of metal-organic frameworks (MOFs) with room-temperature phosphorescence (RTP) mostly relies on using heavy metals,as the heavy atom effect can effectively increase the efficiency of intersystem crossing (ISC) to get a better phosphorescence *** the first time,we reported the highly efficient RTP of a lithium-based MOF IMU-101 with a lifetime (τ) of 299 ms and a quantum yield (QY) of 4.91%.In addition,MOFs IMU-102 and IMU-103,with sodium and cesium as metal nodes,were successfully *** phosphorescence properties of this series of alkali metal MOFs were systematically studied and *** crystallography and computational calculation show that the mechanism for achieving RTP for this material lies in the ultrashort coordination bond of li,which enables the reduction of non-radiative ***-101,as a cheap and environmentally friendly room-temperature phosphorescent material,has been further developed into composite polymer inks and bulk *** makes them promising for applications in anti-counterfeiting and information encryption.

关键词：

关中—天水经济区城市群人口经济与资源环境发展耦合协调性分析

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干旱区地理 2015年第1期38卷 135-147页

作者：杜忠潮黄波陈佳丽咸阳师范学院旅游与资源环境学院陕西咸阳712000

以关中-天水经济区城市群为研究对象,分别构建资源环境和人口经济系统的综合评价指标体系,采用主成分分析法,对该经济区主要城市2002年和2011年资源环境和人口经济的发展指数及其耦合协调度进行测评,并探究其时空差异性。结果表明:2002-... 详细信息

以关中-天水经济区城市群为研究对象,分别构建资源环境和人口经济系统的综合评价指标体系,采用主成分分析法,对该经济区主要城市2002年和2011年资源环境和人口经济的发展指数及其耦合协调度进行测评,并探究其时空差异性。结果表明:2002-2011年其城市资源环境发展水平上升的有渭南、商洛和天水,下降的有西安、铜川、宝鸡、咸阳和杨凌;人口经济发展上升的有西安、铜川、宝鸡、咸阳、渭南和商洛,下降的有天水和杨凌;各主要城市的资源环境与人口经济发展水平及其耦合协调性的空间差异明显,多数城市资源环境与人口经济的耦合协调性不尽合理,且出现衰退趋势。最后就该城市群实现资源环境与人口经济协调发展提出建议和对策。

关键词：关中—天水经济区资源环境人口经济协调发展

胡杨和灰胡杨叶绿素荧光特性对地下水位的生态响应

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干旱地区农业研究 2013年第3期31卷 166-172页

作者：王海珍陈加利韩路塔里木大学植物科学学院新疆阿拉尔843300 新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室新疆阿拉尔843300

选取塔里木河上游不同地下水位的样地作为研究点,利用便携式调制叶绿素荧光仪测定了不同地下水位下胡杨、灰胡杨的叶绿素荧光特性和PSⅡ光合活性。结果表明:随地下水位下降,胡杨、灰胡杨表观光合电子传递速率(ETR)、实际光化学量子效率(... 详细信息

选取塔里木河上游不同地下水位的样地作为研究点,利用便携式调制叶绿素荧光仪测定了不同地下水位下胡杨、灰胡杨的叶绿素荧光特性和PSⅡ光合活性。结果表明:随地下水位下降,胡杨、灰胡杨表观光合电子传递速率(ETR)、实际光化学量子效率(ΦPSⅡ)、光化学猝灭系数(qP)、光化学速率(PCR)、最大荧光(Fm)和PSⅡ潜在光合活性等参数普遍降低;而非光化学猝灭系数(NPQ)、调节性能量耗散量子产量(YNPQ)、非调节性能量耗散量子产量(YN0)、叶片光合功能相对限制值(PED)和光系统间激发能分配不平衡偏离系数(β/α-1)显著升高,但其最大光化学量子产量(Fv/Fm)总体处于相对适宜状态(>0.815)。表明两树种PSⅡ光合活性随地下水位下降而降低,光能捕获效率与光化学反应能量下降,耐受强光能力减弱,获取过剩光能程度和PSⅡ受损风险增加。但两树种可通过良好的抗逆性和自我调节机制,增强热耗散来缓解光能过剩带来的损伤,从而使PSⅡ未发生不可逆损伤,保持其较高的光合效率。比较不同地下水位下胡杨和灰胡杨的叶绿素荧光参数发现,胡杨PSⅡ反应中心活性与光化学效率较高、耐旱性较强,表明胡杨对荒漠干旱环境的适应性强于灰胡杨。

关键词：胡杨灰胡杨叶绿素荧光参数地下水位生态响应

Massive MIMO异构网的高能效资源分配

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信号处理 2017年第7期33卷 901-910页

作者：刘文佳杨晨阳李琪北京航空航天大学电子信息工程学院北京100191 北京三星通信技术研究有限公司北京100028

为满足第五代移动通信系统高频谱效率和高能量效率的需求,提出一种工作在不同频段下行两层异构网中的高能量效率资源分配方法,考虑用户数据率需求和基站最大发射功率。天线和传输带宽是影响系统能量效率的关键因素。通过研究宏基站和小... 详细信息

为满足第五代移动通信系统高频谱效率和高能量效率的需求,提出一种工作在不同频段下行两层异构网中的高能量效率资源分配方法,考虑用户数据率需求和基站最大发射功率。天线和传输带宽是影响系统能量效率的关键因素。通过研究宏基站和小基站的天线资源和带宽分配发现:当系统天线数很大时,发射功耗的影响可以忽略不计;给定带宽分配因子时,达到宏基站或微基站最大发射功率的天线分配因子几乎可以达到最高能效;给定天线分配因子时,系统平均总功耗是关于带宽分配因子的下凸函数,存在全局最优带宽分配因子使能效最高。仿真结果表明,与给定带宽和天线资源的异构网和小小区网络相比,所提出的异构网可以显著提高系统能量效率,而且在大量用户、高数据率需求时能效提升更明显。

关键词：异构网能量效率天线带宽

雷珠单抗联合玻璃体切割术治疗DR合并新生血管性青光眼

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国际眼科杂志 2019年第6期19卷 988-991页

作者：姜辉李家臣黄亚琳中国河南省驻马店市中心医院眼科 463000 河南省人民医院眼科河南省郑州450008

目的:探究雷珠单抗联合玻璃体切割术治疗DR合并新生血管性青光眼(NVG)的临床效果。方法:选取2016-01/2018-02我院眼科收治的DR合并NVG患者198例,根据治疗方案不同分为观察组(103例)和对照组(95例),观察组采用术前注射雷珠单抗联合玻璃... 详细信息

目的:探究雷珠单抗联合玻璃体切割术治疗DR合并新生血管性青光眼(NVG)的临床效果。方法:选取2016-01/2018-02我院眼科收治的DR合并NVG患者198例,根据治疗方案不同分为观察组(103例)和对照组(95例),观察组采用术前注射雷珠单抗联合玻璃体切割术治疗,对照组单纯采用玻璃体切割术治疗,玻璃体切割术后10~15dⅡ期实施Ahmed房水引流阀植入。观察两组治疗后眼压、BCVA、VEGF等指标变化情况。结果:观察组的玻璃体切割术的手术时间、新生血管出血次数、电凝次数均低于对照组(P<0.001)。观察组在玻璃体切割术后1wk和Ⅱ期Ahmed房水引流阀植入术后1moBCVA、眼压均低于对照组(P<0.001)。观察组Ⅱ期Ahmed房水引流阀植入术前VEGF和术后1mo视网膜黄斑中心凹厚度均低于对照组(P<0.001)。观察组总并发发生率低于对照组(10.7%vs28.4%,P<0.05)。结论:雷珠单抗联合玻璃体切割术治疗DR合并NVG的疗效显著,且使Ⅱ期Ahmed房水引流阀植入手术难度下降,对患者视力、眼压水平恢复较好。

关键词：雷珠单抗玻璃体切割术糖尿病视网膜病变新生血管青光眼

Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing li Xiaoge Wang Xiaofan Cao Zhiqun He Chunjun liang Mingxing chen Jing Ju Fangtian You Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： Energy dispersive spectroscopy

High-energy-density lithium manganese iron phosphate for lithium-ion batteries: Progresses, challenges, and prospects

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Journal of Energy Chemistry 2025年第1期100卷 1-17页

作者： Bokun Zhang Xiaoyun Wang Shuai Wang Yan li libo chen Handong jiao Zhijing Yu Jiguo Tu State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic University Institute of Advanced Structure Technology Beijing Institute of Technology

The soaring demand for smart portable electronics and electric vehicles is propelling the advancements in high-energy–density lithium-ion *** manganese iron phosphate (liMnxFe1-xPO4) has garnered significant attention as a promising positive electrode material for lithium-ion batteries due to its advantages of low cost,high safety,long cycle life,high voltage,good high-temperature performance,and high energy *** liMnxFe1-xPO4has made significant breakthroughs in the past few decades,there are still facing great challenges in poor electronic conductivity and li-ion diffusion,manganese dissolution affecting battery cycling performance,as well as low tap *** review systematically summarizes the reaction mechanisms,various synthesis methods,and electrochemical properties of liMnxFe1-xPO4to analyze reaction processes accurately and guide material ***,the main challenges currently faced are concluded,and the corresponding various modification strategies are discussed to enhance the reaction kinetics and electrochemical performance of liMnxFe1-xPO4,including multi-scale particle regulation,heteroatom doping,surface coating,as well as microscopic morphology ***,in view of the current research challenges faced by intrinsic reaction processes,kinetics,and energy storage applications,the promising research directions are *** importantly,it is expected to provide key insights into the development of high-performance and stable liMnxFe1-xPO4materials,to achieve practical energy storage requirements.

关键词： Semiconductor doping