检索结果-南通市图书馆

Nano-Micro Letters 2025年第5期17卷 1-15页

作者： Yanan Xiao he li Tianyi Gu Xiaoteng Jia Shixiang Sun Yong liu Bin Wang he Tian Peng Sun Fangmeng liu Geyu Lu State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China School of Integrated Circuits Tsinghua UniversityBeijing 100084People’s Republic of China International Center of Future Science Jilin UniversityChangchun 130012People’s Republic of China

Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound ***,current intelligent speech assistants based on pressure sensors can only recognize standard languages,which hampers effective communication for non-standard language ***,we prepare an ultralight Ti_(3)C_(2)T_(x)MXene/chitosan/polyvinylidene difluoride composite aerogel with a detection range of 6.25 Pa-1200 k Pa,rapid response/recovery time,and low hysteresis(13.69%).The wearable aerogel pressure sensor can detect speech information through the throat muscle vibrations without any interference,allowing for accurate recognition of six dialects(96.2%accuracy)and seven different words(96.6%accuracy)with the assistance of convolutional neural *** work represents a significant step forward in silent speech recognition for human–machine interaction and physiological signal monitoring.

关键词： Pressure sensor Wearable sensor Ti_(3)C_(2)T_(x) composite aerogel Dialect speech recognition

Can patients with mild non-neoplastic lesions diagnosed at baseline screening be safely exempt from surveillance: evidence from multicenter community-based cohorts

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(life Sciences) 2025年第1期68卷 263-271页

作者： Siyi he Zhiyi Zhang Guohui Song Zhenhai Wang Chunyun Dai Shipeng Yan Kun Jiang Bingbing Song he li Maomao Cao Dianqin Sun Fan Yang Xinxin Yan Shaoli Zhang Yi Teng Qianru li Changfa Xia Wanqing Chen Office of Cancer Screening National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Department of Gastroenterology Gansu Wuwei Tumor HospitalWuwei 730000China Cixian Cancer Institute Handan 056500China linzhou Cancer Hospital Linzhou 456550China Center for Disease Control and Prevention of Sheyang County Yancheng 224499China Department of Cancer Prevention and Control Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangsha 410029China Luoshan Center for Disease Control and Prevention Xinyang 464299China Office for Cancer Control and Research Affiliated Cancer Hospital of Harbin Medical UniversityHarbin 150081China

Surveillance recommendations for gastric cancer(GC)in current guidelines focused on advanced precancerous lesions and were based on precise diagnosis of severity/extent of baseline *** aimed to develop a less endoscopy-related equipment-dependent risk-stratification tool,and assessed whether mild-precursor-lesion patients can be safely exempt from *** the multicenter communitybased cohort,75,051 participants receiving baseline endoscopy were enrolled during 2015–2017 and followed-up until *** incidence rates(CIRs)of GC for precancerous-conditions were calculated by Kaplan-Meier method and compared by Log-rank *** Cox regression models were used to detect potential factors for progression towards GC.A risk score was calculated as counts of selected *** independent cohort,including 26,586 participants was used for external *** a median follow-up of 6.25 years,CIRs of GC were 0.302%,0.436%,and 4.756%for normal group,non-neoplastic(atrophic gastritis/intestinal metaplasia)and neoplastic lesions(low-grade/high-grade dysplasia),respectively(Ptrendlimited vegetable consumption,were selected for ***-risk patients(≥3 risk factors)with non-neoplastic lesions showed higher GC risks(adjusted HR=7.73,95%CI:4.29–13.92),and their four-year CIR reached the one-year CIR of neoplastic *** categorizing non-neoplastic lesions by histological grade,both patients with moderate-to-severe lesions(aHR=3.07,95%CI:1.67–5.64)and high-risk patients with mild lesions(aHR=7.29,95%CI:3.58–14.86)showed higher *** trends were observed in validation ***-risk mild-precursor-lesion patients should receive surveillance within 3–5 years after baseline *** study provides evidence on supplementing current guideline recommendations.

关键词： stomach neoplasms precancerous conditions cancer screening cumulative incidence risk stratification

A robust multi-VSGs coordinated control strategy for distributed secondary frequency regulation in islanded microgrids

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年第3期68卷 335-352页

作者： Jing ZHANG Yong li Jinjie liN Sijia HU Yijia CAO Fang liU Mingmin ZHANG li he College of Electrical and Information Engineering Hunan University Greater Bay Area Institute for Innovation Hunan University College of Information Science and Engineering Central South University College of Electronic Information and Electrical Engineering Changsha University College of Information and Electrical Engineering Hunan University of Science and Technology

Islanded microgrids(IMGs) offer a viable and efficient energy self-sustaining solution for distributed resources in remote areas. While without utility grid support, the frequency of IMG is susceptible to mismatches between demand and generation. Moreover, IMGs encounter uncertain and nonlinear load disturbances together with system parameter perturbation,which further compromises frequency stability. To this aim, this paper proposes a robust multi-virtual synchronous generators(multi-VSGs) coordinated control strategy for distributed secondary frequency regulation(DSFR) in IMGs, which exhibits minimal model dependency and avoids reliance on global information. Two critical methods are developed:(1) a robust VSG control framework that incorporates the linear active disturbance rejection control(LADRC) technique, which enables the estimation and effective elimination of uncertain load disturbances and system's parameter perturbations;(2) a novel secondorder consensus algorithm-based control law for robust secondary frequency regulation, which is featured with proper power sharing among different participants, suppressed power oscillation caused by response disparities, and reduced reliance on complex communication system. Building on methods(1) and(2), a novel multi-VSGs coordinated control strategy is proposed, providing a robust solution for IMG's frequency restoration, and its dynamic characteristics are explored in detail. The correctness and effectiveness of the proposal are verified by both simulation and the hardware-in-the-loop(HIL) experiment results across typical scenarios.

关键词： islanded microgrid (IMG) distributed secondary frequency regulation (DSFR) robust multi-VSGs coordinated control linear active disturbance rejection control (LADRC)

A bi-layer coordinated power regulation strategy considering system dynamics and economics for isolated hybrid AC/DC multi-energy microgrid

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2025年第1期68卷 374-390页

作者： Jing ZHANG Yong li Jinjie liN Sijia HU Yijia CAO li he Xusheng YANG Yong XU lin ZENG linjin XIE College of Electrical and Information Engineering Hunan UniversityChangsha 410082China College of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China State Grid Integrated Energy Service Group Co. Ltd.Beijing 101207China State Grid Hunan Integrated Energy Service Co. Ltd.Changsha 410000China Hunan Disaster Prevention Technology Co. Ltd.Changsha 410000China

The isolated hybrid AC/DC multi-energy microgrid(IH-MEMG)offers an effective solution for meeting the electrical,heating,and cooling energy demands of remote and off-grid *** an IH-MEMG,system transient dynamics(i.e.,frequency or voltage of the electricity network)and economics are critical aspects that pose the greatest concern to ***,these aspects are generally investigated separately owing to their different time *** integrate these aspects from the scope of real-time control,this study proposes a bi-layer coordinated power regulation strategy considering system dynamics and economics for the ***,coupling relationships among multiple sub-networks are analyzed,and a frequency-voltage coupling model between the AC and DC sides is ***,a bi-layer coordinated power regulation strategy is developed for the IH-MEMG with output characteristics of different components involved:the primary layer includes a multi-entity power support mechanism used to improve the dynamics of the electricity network,wherein a cooperation principle of the combined cooling,heating,and power(CCHP)unit and energy storage unit(ESU)is designed in detailed;meanwhile,the secondary layer includes a real-time economics-oriented optimization framework used to adjust the power references of multiple units generated from the primary layer for cost efficiency improvement(notably,the primary layer can work independently).Finally,the effectiveness of the proposed strategy is verified through comprehensive simulations under varying operation scenarios.

关键词： isolated hybrid AC/DC multi-energy microgrid bi-layer coordinated power regulation dynamics and economics combined cooling heating and power unit energy storage unit

结构化影响及其对创作的限制——论哈罗德·布鲁姆的“影响”诗学

在线全文

学校读者我要写书评

暂无评论

新疆大学学报(哲学社会科学版) 2025年第1期53卷 131-138页

作者：何利娴华南师范大学文学院广东广州510000

辨析当代批评家布鲁姆的“影响”诗学与新批评理论之间的渊源关系,有助于发现其诗学的封闭结构化特点。受到这种结构化诗学的影响,“修正”与“压抑”成为后辈的创作表现,并且“影响”诗学凸显前驱者的优先权,追求中心主义的批评原则,因... 详细信息

辨析当代批评家布鲁姆的“影响”诗学与新批评理论之间的渊源关系,有助于发现其诗学的封闭结构化特点。受到这种结构化诗学的影响,“修正”与“压抑”成为后辈的创作表现,并且“影响”诗学凸显前驱者的优先权,追求中心主义的批评原则,因此,它促使后辈的创作更以压抑感为主。布鲁姆以“影响”诗学重新诠释了浪漫主义诗人的创作特点,从而体现出对浪漫主义的重构意义。然而另一方面,“影响”诗学的结构化、体系化分析方式,限制了诗人丰富多维的诗性表达,未能体现诗人在创作中的主体性面貌,这显然与布鲁姆致力于开展的主体批评相悖,侧面反映出他难以挽救后现代语境下主体被消解的命运走向。

关键词：哈罗德·布鲁姆新批评 “影响”诗学结构创作

在线全文

学校读者我要写书评

暂无评论

气湿改性解除低渗砂岩凝析气藏液锁

石油化工 2025年第2期54卷 240-246页

作者：何黎李华斌何刚李晓辉罗磊成都理工大学能源学院四川成都610059 中国石油吐哈油田公司采油工艺研究院新疆哈密839099

采用气湿改性剂PQS-28对岩心表面进行改性,利用FTIR、SEM和接触角测试等方法以及岩心自吸和驱替实验,考察了改性前后岩心的形貌结构、润湿性变化及解除液锁伤害的能力。实验结果表明,PQS-28可将岩心表面润湿性转变为强气湿性,改性后地... 详细信息

采用气湿改性剂PQS-28对岩心表面进行改性,利用FTIR、SEM和接触角测试等方法以及岩心自吸和驱替实验,考察了改性前后岩心的形貌结构、润湿性变化及解除液锁伤害的能力。实验结果表明,PQS-28可将岩心表面润湿性转变为强气湿性,改性后地层条件下老化63 d后,水相和油相接触角为130.4°和105.6°;PQS-28是通过取代羟基连接在岩石表面,实现润湿改性;岩心经PQS-28溶液改性后,300 min内水相和油相自吸量减少65.93%和64.40%,水锁和油锁岩心渗透率平均提高8.63倍和2.36倍;PQS-28改性后岩心转变为气湿性,利于岩心内部液相排出,解除液锁,提高气相渗透率。

关键词：凝析气藏液锁润湿改性接触角表面自由能

在线全文

学校读者我要写书评

暂无评论

广义混合奇异元及应力强度因子分析

应用力学学报 2025年第1期42卷 91-98页

作者：贺立卿光辉中国民航大学航空工程学院天津300300

采用位移法求解裂纹的应力强度因子,不方便引入裂纹边上已知的应力边界条件,模型有失理性与客观。融合奇异元的思想,提出了用于分析含裂纹二维结构的应力强度因子的广义混合奇异元列式,基于该列式的有限元模型兼顾了裂纹尖端力学参量的... 详细信息

采用位移法求解裂纹的应力强度因子,不方便引入裂纹边上已知的应力边界条件,模型有失理性与客观。融合奇异元的思想,提出了用于分析含裂纹二维结构的应力强度因子的广义混合奇异元列式,基于该列式的有限元模型兼顾了裂纹尖端力学参量的奇异性和裂纹边应力边界条件的引入。实例分析表明,该方法的应力强度因子结果收敛稳定可靠。同时分析了应力边界条件对数值结果的影响,结果表明考虑裂纹边应力边界条件时应力强度因子精度更高。

关键词：奇异性广义混合奇异元应力强度因子裂纹应力边界条件

四川盆地霾过程边界层逆温的演化特征及其污染效应

在线全文

学校读者我要写书评

暂无评论

中国环境科学 2025年第1期45卷 11-18页

作者：贺丽媛杨柳朱瑶倪长健成都信息工程大学大气科学学院四川成都610225 成都平原城市气象与环境四川省野外科学观测研究站四川成都610225 成都市气象局四川成都611130

利用四川盆地2014~2017年冬季4个地区(成都､宜宾､达州和重庆)的秒级探空资料和常规环境气象监测数据,结合同期成都的Mie散射激光雷达探测资料,通过大气消光系数廓线识别边界层结构,探究了霾天气过程中大气边界层逆温演化特征及其污染效... 详细信息

利用四川盆地2014~2017年冬季4个地区(成都､宜宾､达州和重庆)的秒级探空资料和常规环境气象监测数据,结合同期成都的Mie散射激光雷达探测资料,通过大气消光系数廓线识别边界层结构,探究了霾天气过程中大气边界层逆温演化特征及其污染效应.结果表明:贴地逆温(Sli)､混合层顶逆温(Mli)以及气溶胶分界层逆温(ABI)是边界层逆温的3种基本形态.三层逆温一致表现为自下而上逐渐减弱的形态特征,但在地区之间呈现出明显的空间分异性.随着霾从形成期向发展期和持续期的渐进演化,三层逆温的发生频率显著上升,Sli的强度和厚度逐渐减小,Mli的强度和厚度则不断增加,底高也随之降低,ABI的强度和厚度呈波动变化.Sli和Mli的共存及其协同演变不仅强烈地抑制了地面污染物的垂直扩散,而且有利于近地面湿度的增加,进而诱发地面颗粒物的积聚以及吸湿性的增强,从而导致地面能见度降低.上述成果从新的视角揭示了四川盆地霾过程边界层逆温的复杂演化形态及其影响,也为后续针对对流层低层逆温的一体化研究奠定了基础.

关键词：霾过程边界层逆温污染效应四川盆地

常压下配备强电场碎裂单元的串联离子迁移谱研制与爆炸物检测

在线全文

学校读者我要写书评

暂无评论

质谱学报 2025年第1期46卷 106-114页

作者：刘康怡冼天信李灵锋张允晶何兴理李鹏苏州大学电子信息学院江苏苏州215006 苏州微木智能系统有限公司江苏苏州215163

痕量爆炸物探测是保障公共安全的重要一环。离子迁移谱是探测爆炸物和与爆炸物有关化合物的有效技术手段。然而,在实际使用中,受限于离子迁移谱较低的分辨率,易产生假阳性结果。类似于质谱中的碰撞诱导解离(CID),爆炸物在常压下可以通... 详细信息

痕量爆炸物探测是保障公共安全的重要一环。离子迁移谱是探测爆炸物和与爆炸物有关化合物的有效技术手段。然而,在实际使用中,受限于离子迁移谱较低的分辨率,易产生假阳性结果。类似于质谱中的碰撞诱导解离(CID),爆炸物在常压下可以通过射频强电场解离成碎片离子。本工作研制了双离子门结构的串联离子迁移谱,以硝酸铵(AN)、环三亚甲基三硝胺(RDX)、季戊四醇四硝酸酯(PETN)3种爆炸物为代表物质,在常压下获得3种爆炸物及其掺杂产物的一级迁移谱图,根据其迁移谱可以分离母离子,再经强电场碎裂后得到二级碎片离子。在常压170℃、频率2.6 MHz、峰值900 V的电压下,AN母离子的解离率可达95%;在频率2.6 MHz、峰值1500 V的电压下,RDX产物离子[RDX+NO2]-以及掺杂C2Cl6的RDX产物离子[RDX+Cl]-的解离率分别为93%和15%;[PETN+NO3]-和[PETN+Cl]-的解离率分别为54%和48%。离子的碎裂程度主要受离子结构特性的影响,而电场和温度的升高会进一步促进其碎裂。二级碎片离子和母离子漂移时间相结合为爆炸物检测提供了丰富的化学信息,有望降低检爆仪的假阳性率。

关键词：爆炸物串联离子迁移谱(tandem IMS) 离子碎裂

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

面向机动目标的设定时间多约束协同制导律

自动化学报 2025年第1期51卷 104-116页

作者：李鹤宇王建斌张锐宋峰北京电子工程总体研究所北京100854

针对三维空间中多航天器协同捕获机动目标问题,提出一种具有终端角度约束和时间一致性约束的设定时间协同制导律,将视线(line-of-sight,LOS)角误差和齐射攻击的收敛时间作为一个可提前设定的参数,实现对收敛时间进行设置.构建三维场景... 详细信息

针对三维空间中多航天器协同捕获机动目标问题,提出一种具有终端角度约束和时间一致性约束的设定时间协同制导律,将视线(line-of-sight,LOS)角误差和齐射攻击的收敛时间作为一个可提前设定的参数,实现对收敛时间进行设置.构建三维场景航天器−目标运动学模型,在沿视线方向将同时攻击问题转化为一致性问题,提出一种分布式协同制导律,设定时间内使得多个航天器剩余飞行时间相等;在垂直视线方向利用滑模控制方法对制导律进行设计,使得每个航天器的视线角在设定时间内达到期望值.上述制导律中,设计了一种设定时间扩展状态观测器(Predefined-time extended state observer,PTESO)对未知的目标加速度进行估计.数值仿真结果验证了方法的有效性.

关键词：航天器协同制导律设定时间收敛状态估计时间一致性

维普期刊数据库博看期刊