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Journal of Thermal Science 2024年第2期33卷 739-750页

作者： WU Gang MA Qianli WEI lijiang JIANG Guohe WANG Tengfei li tie Merchant Marine College Shanghai Maritime UniversityShanghai201306China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China

In this work,particulate matter(PM) emissions from a large two-stroke,low-speed marine diesel engine were investigated when the engine was operated with low-sulfur heavy fuel oil(HFO) at various *** samples were collected in situ from the engine exhaust to determine the detailed physical and chemical *** nanostructure and morphology of the nanoparticles were analyzed using transmission electron microscopy images(TEM).The results show that volatile organic carbon(OC) accounts for more than 80% in the HFO particles and leads to an increase in particle *** thermodynamic conditions of a low-speed engine favor the behavior of capturing the soluble organic components.A large number of spherical char HFO particles with aerodynamic diameters of 0.2 μm-0.5 μm and a suspected inner metal core were *** two peak aerodynamic diameters of the HFO nanoparticles are 15 nm and 86 *** morphological differences among the HFO nanoparticles in varied engine conditions represent the formation process from primary nascent particles to mature graphitized particles caused by *** above study will be valuable for understanding the characteristics of PM emissions from low-sulfur HFO to achieve the ship PM emissions reduction target.

关键词： low-speed diesel engine maritime regulations heavy fuel oil TEM particles size and distribution

A multifunctional flexible sensor based on PI-MXene/SrTiO_(3) hybrid aerogel for tactile perception

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The Innovation 2024年第3期5卷 44-54页

作者： Shihao Deng Yue li Shengzhao li Shen Yuan Hao Zhu Ju Bai Jingyi Xu Lu Peng tie li Ting Zhang Nano Science and Technology Institute University of Science and Technology of China(USTC)Suzhou 215123China i-lab Nano-X Vacuum Interconnected WorkstationKey Laboratory of Multifunctional Nanomaterials and Smart SystemsSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of China(USTC)Hefei 230026China Jiangxi Institute of Nanotechnology 278 Luozhu RoadXiaolan Economic and Technological Development ZoneNanchang 330200China

The inadequacy of tactile perception systems in humanoid robotic manipulators limits the breadth of available robotic ***,we designed a multifunctional flexible tactile sensor for robotic fingers that provides capabilities similar to those of human skin sensing *** sensor utilizes a novel PI-MXene/SrTiO_(3) hybrid aerogel developed as a sensing unit with the additional abilities of electromagnetic transmission and thermal insulation to adapt to certain complex ***,polyimide(PI)provides a high-strength skeleton,MXene realizes a pressure-sensing function,and MXene/SrTiO_(3) achieves both thermoelectric and infrared radiation response ***,via the pressure response mechanism and unsteady-state heat transfer,these aerogel-derived flexible sensors realize multimodal sensing and recognition capabilities with minimal *** can differentiate among 13 types of hardness and four types of material from objects with accuracies of 94%and 85%,respectively,using a decision tree *** addition,based on the infrared radiation-sensing function,a sensory array was assembled,and different shapes of objects were successfully *** findings demonstrate that this PI-MXene/SrTiO_(3) aerogel provides a new concept for expanding the multifunctionality of flexible sensors such that the manipulator can more closely reach the tactile level of the human *** advancement reduces the difficulty of integrating humanoid robots and provides a new breadth of application scenarios for their possibility.

关键词： utilize integrating insulation

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李铁教授治疗不寐症学术思想与临床经验

四川中医 2024年第8期42卷 11-14页

作者：周正国李铁汪莉辽宁中医药大学中医科辽宁沈阳110000 大连市第二人民医院中医科辽宁大连116011

李铁教授对不寐症提出“四型分治”理论进行辨证施治。本文系统总结李铁教授治疗不寐症的中医理论体系,梳理其学术思想,并对其临床经验进行了总结。

关键词：不寐症少寐早醒无寐学术思想临床经验

Copy number variation of NAL23 causes narrow-leaf development in rice

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Journal of Genetics and Genomics 2024年第8期51卷 880-883页

作者： Degui Zhou Yajing li Xianrong Xie Wenyan Ding libin Chen tie li Jianian Tang Xiyu Tan Weizhi liu Yueqin Heng Yongyao Xie Letian Chen Qi liu Shaochuan Zhou Jing Zhao Gong Zhang Jiantao Tan Yaoguang liu Rongxin Shen State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangdong Laboratory for Lingnan Modern AgricultureCollege of Life SciencesSouth China Agricultural UniversityGuangzhouGuangdong 510642China Guangdong Key Laboratory of New Technology in Rice Breeding Rice Research InstituteGuangdong Academy of Agricultural SciencesGuangzhouGuangdong 510640China Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes and MOE Key Laboratory of Tumor Molecular Biology Institute of Life and Health EngineeringJinan UniversityGuangzhouGuangdong 510632China

Leaf shape is a key trait for plant architecture relating to photosynthesis and transpiration in plants(Lawson et al.,2020).Erect leaves with proper leaf length and width,particularly the upper three leaves in cereal crops,could significantly improve light absorption efficiency in canopy and ultimately increase crop yield(Jiao et al.,2010).Rice leaves initiate at the peripheral zone of shoot apical meristem,then develop along the proximal-distal,adaxial-abaxial,and mediallateral axes to form a flat symmetric architecture(Du et al.,2018).

关键词： crops cereal narrow

Physiological Analysis of Drought Resistance of Seven Cultivars Spring Wheat in Northern Regions of China

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Journal of Northeast Agricultural University(English Edition) 2024年第2期31卷 1-12页

作者： Gao Fengmei Zhang Fuzhi Zhao Yuanling li tie li Dongmei Sun Minglong Zhang Qichang liu Ningtao Sun Dan Tian Chao Sun lianfa Institute of Crop Resources Heilongjiang Academy of Agricultural SciencesHarbin 150086China College of Art and Design Harbin Institute of Information EngineeringHarbin 150431China

In order to determine the physiological mechanism of drought resistance of northern wheat in China,six drought resistant wheat and one sensitivity to drought wheat were planted in *** were subjected to drought treatment and normal water when the plants grew to the 3-leaf *** were collected at 10,20,30,and 40 days after the drought treatment,*** electrical conductivity,photosynthetic parameters,chlorophyll fluorescence parameters,sugar content,proline content,protein content,and active oxygen scavenging enzyme activity of the plants were detected,and the agronomic traits of the wheat varieties were investigated at *** results indicated that the phenotype and yield-related factors of Darkhan 144 changed little under the drought *** relative electrical conductivity of Kefeng 6 and Darkhan 166 was lower under the drought stress,and their cell membrane was less *** Darkhan 144 and Darkhan 166 had higher drought resistance coefficients,and were the wheat varieties with stronger drought ***,the physiological mechanisms of drought resistance of these three wheat were different:Darkhan 144 maintained a higher photosynthetic activity under the drought stress;Darkhan 166 maintained a higher protein content,photosynthetic activity and active oxygen scavenging enzyme *** addition,other drought-resistant varieties Kefeng 6,Kefeng 10 and Longmai 26 had a higher content of osmoregulatory substances under the drought stress.

关键词： wheat tolerance drought physiological mechanism

ChatGPT赋能研究生科研:机遇洞察、风险透视与策略探赜

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科学管理研究 2024年第2期42卷 32-40页

作者：李铁英马鑫东北林业大学马克思主义学院黑龙江哈尔滨150040

受本次ChatGPT热潮的影响,研究生群体不可避免的成为了ChatGPT的主要早期用户。关于ChatGPT在教育与科研领域的运用,目前社会各界人士看法不一、尚未达成普遍共识。而根据当前学术界的研究结果与ChatGPT的产品功能来看,研究生使用ChatGP... 详细信息

受本次ChatGPT热潮的影响,研究生群体不可避免的成为了ChatGPT的主要早期用户。关于ChatGPT在教育与科研领域的运用,目前社会各界人士看法不一、尚未达成普遍共识。而根据当前学术界的研究结果与ChatGPT的产品功能来看,研究生使用ChatGPT有利也有弊。好处是ChatGPT的性能卓越、表现出色,能够作为研究生的互动科研伴侣、智能科研助理、数字科研导师和优秀科研榜样等,辅助研究生高效的学习和科研。不利的是ChatGPT先天存在技术缺陷,加上研究生的不合理使用,容易引发师生关系淡化、科研过度自由、过分技术依赖和学术道德失范等问题,会影响研究生正常的学习和科研生活。但总的来看,ChatGPT作为一项新技术应用于研究生的学习和科研具有很多可为之处。因此,可以从增进师生情感互动、创新科研团队管理、培养学生技术素养和健全科研监督管理等方面着手,消解ChatGPT给研究生带来的不利影响,发挥ChatGPT辅助研究生高效学习与科研的独特优势。

关键词：人工智能 ChatGPT 研究生科研活动

轻量化YOLOv7-tiny的遥感图像小目标检测

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科学技术与工程 2024年第18期24卷 7726-7732页

作者：桑雨李立权李铁辽宁工程技术大学电子与信息工程学院葫芦岛125105

针对遥感图像小目标众多、目标检测器参数量大和检测效率低等问题,提出了一种改进的YOLOv7-tiny的轻量级遥感图像小目标检测模型。首先,针对原始模型中跨阶段局部空间金字塔池化网络复杂的碎片化操作,提出轻量级的空间金字塔池化结构来... 详细信息

针对遥感图像小目标众多、目标检测器参数量大和检测效率低等问题,提出了一种改进的YOLOv7-tiny的轻量级遥感图像小目标检测模型。首先,针对原始模型中跨阶段局部空间金字塔池化网络复杂的碎片化操作,提出轻量级的空间金字塔池化结构来减少多余的卷积算子操作;其次,针对颈部网络冗余的模块化连接方式和小目标容易在深层特征丢失空间信息的问题,提出深层语义信息引导的单尺度预测头方法来进行小目标位置信息强化,并进一步减少颈部网络和头部网络的计算成本。在遥感图像数据集上展开实验,结果表明,改进后的模型比原始模型参数量降低49.6%,计算复杂度降低28.5%,推理速度提高73.1%,并优于现阶段其他主流轻量级目标检测器。

关键词：目标检测 YOLOv7-tiny 轻量化遥感图像语义信息引导

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降雨和大气分子环境对引信回波响应的影响

兵器装备工程学报 2024年第5期45卷 86-92页

作者：钟海超李铁李岗田博李伟西安机电信息技术研究所西安710065 机电动态控制重点实验室西安710065

针对大气环境特性数据在引信工程设计中运用不足的问题,基于Monte-Carlo辐射传输模型和数字信号处理模型,提出了一种将大气环境特性数据应用于引信回波响应特性的仿真建模方法,利用ITU建立雨衰模型,验证了本文中的雨衰模型,研究了雨滴... 详细信息

针对大气环境特性数据在引信工程设计中运用不足的问题,基于Monte-Carlo辐射传输模型和数字信号处理模型,提出了一种将大气环境特性数据应用于引信回波响应特性的仿真建模方法,利用ITU建立雨衰模型,验证了本文中的雨衰模型,研究了雨滴、水蒸气和氧气分子综合作用下对非大气窗口毫米波的衰减特性,并将毫米波的衰减特性数据应用于引信回波响应特性的仿真建模中,建立了引信回波响应模型,给出了引信回波响应特性中的一维距离像和距离-多普勒像,分析了暴雨和特大暴雨中引信目标回波功率和信噪比的变化规律。研究发现,中心频率60、118、184 GHz引信目标回波功率在暴雨中分别降低了2.5、1.8、2.9 dB,信噪比分别降低了1.2、0.9、1.3 dB。结果表明:即使是特大暴雨,空气中雨滴的散射与吸收作用对短距离引信目标回波并不能产生质的改变,但会降低目标回波的信噪比,使引信探测系统目标检测概率下降。从无雨到暴雨再到特大暴雨,中心频率60 GHz引信回波信噪比分别为15.7、14.4、12.9 dB,基于Neyman-Pearson准则,当引信探测系统虚警概率为10-7时,引信探测器的目标检测概率分别为0.999 7、0.986 9和0.852 1,结果显示,极端条件下的降雨颗粒和大气分子的衰减特性对引信的目标检测概率影响显著。文中降雨和大气分子对引信探测影响的建模方法可为引信工程设计中的环境适应性评估提供理论与方法支撑。

关键词：引信技术引信响应特性大气环境特性衰减系数信噪比暴雨

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模糊理论在智能变电站通信网络评价中的应用

机械设计与制造 2024年第4期398卷 28-32,37页

作者：栗会峰李铁成栗维勋国网河北省电力有限公司电力科学研究院河北石家庄050021 国网河北省电力有限公司河北石家庄050021

针对目前智能变电站通信网络状态评估难、网络复杂等问题,在智能变电站体系结构的基础上,提出了一种模糊理论用于智能变电站通信网络状态综合评价。采用隶属函数将元素转化为隶属度,并结合层次分析法和斯皮尔曼相关系数法确定权值,根据... 详细信息

针对目前智能变电站通信网络状态评估难、网络复杂等问题,在智能变电站体系结构的基础上,提出了一种模糊理论用于智能变电站通信网络状态综合评价。采用隶属函数将元素转化为隶属度,并结合层次分析法和斯皮尔曼相关系数法确定权值,根据隶属度和权值得到综合评价结果。通过算例对不同情况进行对比分析,验证了该方法的优越性。结果表明,该方法可以反应整个通信网络的状态,也可以进一步反映负荷状态、报文传输效果等,为系统状态的维护提供一定的依据。

关键词：模糊理论智能变电站通信网络层次分析法综合评价斯皮尔曼相关系数法

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基于多分支空谱特征增强的高光谱图像分类

液晶与显示 2024年第6期39卷 844-855页

作者：李铁李文许王军国高乔裕辽宁工程技术大学电子与信息工程学院辽宁葫芦岛125105

为了解决高光谱图像自身及分类过程中噪声干扰大、空间-光谱特征信息提取不足以及有限样本下分类性能不佳等问题,提出一种基于多分支空谱特征增强的高光谱图像分类模型SSFE-MBACNN。首先,利用多分支特征提取模块分别提取浅层空谱特征和... 详细信息

为了解决高光谱图像自身及分类过程中噪声干扰大、空间-光谱特征信息提取不足以及有限样本下分类性能不佳等问题,提出一种基于多分支空谱特征增强的高光谱图像分类模型SSFE-MBACNN。首先,利用多分支特征提取模块分别提取浅层空谱特征和深层空间特征信息,并引入注意力机制抑制噪声干扰。其次,设计一种改进多尺度空谱特征提取融合模块及结合双池化和空洞卷积的空间特征增强模块实现空谱特征增强,减少模型参数量和提高分类性能。最后,用全局平均池化层代替全连接层,进一步降低参数量,缓解模型过拟合问题。实验结果表明,在Indian Pines(10%训练样本)、Pavia University (5%训练样本)和Salinas(1%训练样本)数据集分别取得了0.990 7、0.997 5和0.994 7的总体分类精度。SSFE-MBACNN不仅能充分利用空谱特征信息,而且在有限样本下也取得了优秀的分类性能,明显高于其他对比方法。

关键词：高光谱图像分类特征增强多分支特征提取注意力机制多尺度特征双池化空洞卷积

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