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Study on Two-phase Nanocrystalline Nd_(8.5)Fe_(74)Co_5Cu_1Nb_1Zr_3Cr_1B_(6.5)Permanent Magnet

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Journal of Materials Science & Technology 2004年第2期20卷 142-144页

作者： Jiansen NI, Hui XU, mingyuan ZHU, Qiang li, Bangxin ZHOU and Yuanda DONGInstitute of Materials, Shanghai University, Shanghai 200072, China Inst. of Mat. Shanghai Univ. Shanghai 200072 China

Nd8.5Fe74Co5Cu1Nb1Zr3Cr1B6.5 bonded magnets were prepared by melt-spun and subsequent heat treatment. Magnetic properties of Br=0.68 T,JHc=716 kA/m, (BH)max=77 kJ/m3 were achieved. The addition of Cr element shows to ... 详细信息

关键词： Nd-Fe-B Nanocrystalline Melt-spinning Magnetic properties

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中国免疫学杂志 2022年第17期38卷 2123-2128页

作者：李鸣远孟岩武云新疆医科大学第一附属医院全科医学科乌鲁木齐830054 新疆医科大学第一附属医院风湿免疫科乌鲁木齐830054

目的:探讨沉默狼疮相关肺动脉高压(SLE-PAH)高表达的HMGB1通过TLR4/NF-κB途径抑制低氧诱导的PASMC增殖、迁移及胶原合成的作用机制。方法:分别测定SLE-PAH患者血浆中HMGB1含量与低氧诱导PASMC内HMGB1表达的变化;siRNA沉默PASMC内HMGB1... 详细信息

目的:探讨沉默狼疮相关肺动脉高压(SLE-PAH)高表达的HMGB1通过TLR4/NF-κB途径抑制低氧诱导的PASMC增殖、迁移及胶原合成的作用机制。方法:分别测定SLE-PAH患者血浆中HMGB1含量与低氧诱导PASMC内HMGB1表达的变化;siRNA沉默PASMC内HMGB1表达,MTT法与EdU实验测定细胞增殖,Boyden小室试验测定细胞迁移,胶原酶消化法与Western blot测定胶原合成能力,同时检测TLR4/NF-κB信号通路的表达情况;采用siRNA-HMGB1与TLR4激活剂处理PASMC,低氧环境下培养,再次测定上述指标的变化。结果:与正常受试者及SLE患者相比,SLE-PAH患者血浆中HMGB1含量显著升高(P<0.05),且SLE-PAH患者中处于SLE活动期与合并重度PAH血浆HMGB1含量高于非活动期与合并轻中度PAH(P<0.05);低氧诱导PASMC同样促进了HMGB1表达(P<0.05);而沉默HMGB1则能抑制低氧诱导的PASMC增殖、迁移及胶原合成(P<0.05),同时抑制TLR4/NF-κB信号通路的表达(P<0.05),但该变化能被TLR4激活剂LPS所逆转(P<0.05)。结论:HMGB1通过TLR4/NF-κB途径抑制低氧诱导的PASMC增殖、迁移及胶原合成,是SLE-PAH可能的治疗靶标。

关键词：系统性红斑狼疮肺动脉高压肺动脉平滑肌肉细胞高迁移率族蛋白 Toll样受体4

An efficient recycling strategy to eliminate the residual“impurities”while heal the damaged structure of spent graphite anodes

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Green Energy & Environment 2024年第6期9卷 1027-1034页

作者： Dan Yang Ying Yang Haoran Du Yongsheng Ji mingyuan Ma Yujun Pan Xiaoqun Qi Quan Sun Kaiyuan Shi Long Qie Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai201804China State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Shuangdeng Group Co. Ltd.Taizhou225500China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou510275China

The recycling of graphite from spent lithium-ion batteries(liBs)is overlooked due to its relatively low added value and the lack of efficient recovering *** reuse the spent graphite anodes,we need to eliminate their useless components(mainly the degraded solid electrolyte interphase,SEI)and reconstruct their damaged ***,a facile and efficient strategy is proposed to recycle the spent graphite on the basis of the careful investigation of the composition of the cycled graphite anodes and the rational design of the regeneration *** regenerated graphite,which is revitalized by calcination treatment and acid leaching,delivers superb rate performance and a high specific capacity of 370 mAh g^(-1)(~99% of its theoretical capacity)after 100 cycles at 0.1 C,superior to the commercial graphite *** improved electrochemical performance could be attributed to unchoked li^(+) transport channels and enhanced charge transfer reaction due to the effective destruction of the degraded SEI and the full recovery of the damaged structure of the spent *** work clarifies that the electrochemical performance of the regenerated graphite could be deteriorated by even a trace amount of the residual“impurity”and provides a facile method for the efficient regeneration of graphite anodes.

关键词： Graphite Anode Regeneration Solid electrolyte interphase Spent lithium-ion battery

Waste Cotton-Derived Fiber-Based Thermoelectric Aerogel for Wearable and Self-Powered Temperature-Compression Strain Dual-Parameter Sensing

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Engineering 2024年第8期39卷 235-243页

作者： Xinyang He mingyuan liu Jiaxin Cai Zhen li Zhilin Teng Yunna Hao Yifan Cui Jianyong Yu liming Wang Xiaohong Qin Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Key Laboratory of Science and Technology of Eco-Textiles Ministry of EducationJiangnan UniversityWuxi 214122China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

The rapid development of the global economy and population growth are accompanied by the production of numerous waste *** leads to a waste of limited resources and serious environmental pollution problems caused by improper *** rational recycling of wasted textiles and their transformation into high-value-added emerging products,such as smart wearable devices,is ***,we propose a novel roadmap for turning waste cotton fabrics into three-dimensional elastic fiber-based thermoelectric aerogels by a one-step lyophilization process with decoupled self-powered temperature-compression strain dual-parameter sensing *** thermoelectric aerogel exhibits a fast compression response time of 0.2 s,a relatively high Seebeck coefficient of 43μV·K^(-1),and an ultralow thermal conductivity of less than 0.04 W·m^(-1)·K^(-1).The cross-linking of trimethoxy(methyl)silane(MTMS)and cellulose endowed the aerogel with excellent elasticity,allowing it to be used as a compressive strain sensor for guessing games and facial expression *** addition,based on the thermoelectric effect,the aerogel can perform temperature detection and differentiation in self-powered mode with the output thermal voltage as the stimulus ***,the wearable system,prepared by connecting the aerogel-prepared array device with a wireless transmission module,allows for temperature alerts in a mobile phone application without signal interference due to the compressive strains generated during ***,our strategy is significant for reducing global environmental pollution and provides a revelatory path for transforming waste textiles into high-value-added smart wearable devices.

关键词： Waste textiles High value-added recycling Thermoelectrics Elasticity Decoupled sensing

Floquet spectrum and universal dynamics of a periodically driven two-atom system

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Chinese Physics B 2024年第2期33卷 436-443页

作者：谢文柱周正强李轩崔思淼孙明远 School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

We investigate the Floquet spectrum and excitation properties of a two-ultracold-atom system with periodically driven interaction in a three-dimensional harmonic *** interaction between the atoms is changed by varying the s-wave scattering length in two ways,the cosine and the square-wave *** is found that as the driving frequency increases,the Floquet spectrum exhibits two main features for both modulations,the accumulating and the spreading of the quasienergy levels,which further lead to different dynamical *** accumulation is associated with collective excitations and the persistent growth of the energy,while the spread indicates that the energy is bounded at all *** initial scattering length,the driving frequency and amplitude can all significantly change the Floquet spectrum as well as the ***,the corresponding relation between them is valid ***,we propose a mechanism for selectively exciting the system to one specific state by using the avoided crossing of two quasienergy levels,which could guide preparation of a desired state in experiments.

关键词： Floquet spectrum universal dynamics two-atom system avoided crossing

Preliminary experimental results by the prototype of Sanya Incoherent Scatter Radar

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Earth and Planetary Physics 2020年第6期4卷 579-587页

作者： XinAn Yue WeiXing Wan Han Xiao lingQi Zeng ChangHai Ke BaiQi Ning Feng Ding BiQiang Zhao lin Jin Chen li mingyuan li JunYi Wang Honglian Hao Ning Zhang Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China Beijing National Observatory of Space Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of the Chinese Academy of SciencesBeijing 100049China Nanjing Research Institute of Electronics Technology Nanjing 210039China

In the past decades,the Incoherent Scatter Radar(ISR)has been demonstrated to be one of the most powerful instruments for ionosphere *** Institute of Geology and Geophysics at the Chinese Academy of Sciences was founded to build a state-ofthe-art phased-array ISR at Sanya(18.3°N,109.6°E),a low-latitude station on Hainan Island,named the Sanya ISR(SYISR).As a first step,a prototype radar system consisting of eight subarrays(SYISR-8)was built to reduce the technical risk of producing the entire large *** this work,we have summarized the preliminary experimental results based on the *** amplitude and phase among 256 channels were first calibrated through an embedded internal monitoring *** mean oscillation of the amplitude and phase after calibration were about 1 dB and 5°,respectively,which met the basic *** beam directivity was confirmed by crossing screen of the International Space *** SYISR-8 was further used to detect the tropospheric wind profile and *** derived winds were evaluated by comparison with independent radiosonde and balloon-based GPS *** SYISR-8 was able to observe several typical meteor echoes,such as the meteor head echo,range-spread trail echo,and specular trail *** results confirmed the validity and reliability of the SYISR-8 system,thereby reducing the technical risk of producing the entire large array of the SYISR to some extent.

关键词： incoherent scatter radar SYISR ionosphere phased array beam direction tropospheric wind meteor

余甘子微波-热风分段联合干燥工艺优化及动力学模型研究

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食品与发酵工业 2023年第22期49卷 131-139页

作者：李晓凤杨琳王嘉祥李明元西华大学食品与生物工程学院四川成都610039

余甘子在工业生产中的干燥方式主要采用热风干燥,存在干燥效率低,产品质量不佳等问题。为改善此现状,该研究利用微波干燥技术的优势,探究微波-热风分段联合干燥技术在余甘子初加工中的应用,寻求最佳干燥工艺。在不同微波密度、转换点干... 详细信息

余甘子在工业生产中的干燥方式主要采用热风干燥,存在干燥效率低,产品质量不佳等问题。为改善此现状,该研究利用微波干燥技术的优势,探究微波-热风分段联合干燥技术在余甘子初加工中的应用,寻求最佳干燥工艺。在不同微波密度、转换点干基含水率、热风温度条件下进行单因素试验,以余甘子干制品多酚含量、黄酮含量、维生素C保留率和褐变度为评价指标,干燥特性为参考指标,分析余甘子微波-热风联合干燥工艺参数适宜范围,采用Box-Behnken响应面法进行优化。确定余甘子的最佳干燥工艺为:微波密度5.0 W/g,转化点干基含水率为2.0 g/g,热风温度为60℃。Two-term模型为描述微波-热风分段联合干燥的最优模型,能较好地模拟最佳工艺条件下干基含水率的变化规律。与传统热风干燥相比,使用微波-热风分段联合干燥工艺干燥余甘子获得的干制品品质更佳,能耗更低,因此微波-热风分段联合干燥技术是一种有效且适合余甘子的干燥方法。

关键词：联合干燥余甘子响应面优化干燥模型最优工艺

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基于贝塞尔曲线网络的电表用电信息识别算法

电力系统保护与控制 2022年第14期50卷 133-141页

作者：孙福明高严许蕊李明渊魏晓鸣大连民族大学信息与通信工程学院辽宁大连116600 大连民族大学网络中心辽宁大连116600

利用计算机视觉技术来快速、准确地获得用户的用电信息对于电力部门具有重要意义。针对传统算法精度低、速度慢等问题,提出了一种基于自适应贝塞尔曲线网络的用电信息识别算法。该框架集检测、识别于一体,实现了端到端的文本定位和预测... 详细信息

利用计算机视觉技术来快速、准确地获得用户的用电信息对于电力部门具有重要意义。针对传统算法精度低、速度慢等问题,提出了一种基于自适应贝塞尔曲线网络的用电信息识别算法。该框架集检测、识别于一体,实现了端到端的文本定位和预测。检测端结合了特征金字塔网络和残差网络,对输入图像进行特征提取,并通过四个控制点生成贝塞尔曲线,能更好地拟合文本框。识别端采用了卷积循环神经网络,引入门控循环单元替代长短期记忆网络,再结合注意力机制对文本进行识别。最后在数据集上开展五组消融实验,进行性能对比和评估分析。实验结果显示,该算法识别精度高达99.08%,且推理速度快,可被用于用电信息检测与识别的实际应用中。

关键词：机器视觉自适应贝塞尔曲线网络电表端到端注意力机制

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高温超导磁悬浮列车振动特性分析及其参数可行域研究

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振动与冲击 2023年第18期42卷 30-38页

作者：张明亮杨新梦刘丽茹李明远石家庄铁道大学机械工程学院石家庄050043 兰州交通大学光电技术与智能控制教育部重点实验室兰州730070

高温超导磁悬浮列车在运行时由于轨道不平顺和风阻等因素的影响,导致悬浮间隙发生改变,列车的悬浮力特性使其具有恢复到原平衡位置的能力,在恢复过程中引起了列车的振动,需要研究列车的自由振动行为。通过试验平台测试得到不同悬浮间隙... 详细信息

高温超导磁悬浮列车在运行时由于轨道不平顺和风阻等因素的影响,导致悬浮间隙发生改变,列车的悬浮力特性使其具有恢复到原平衡位置的能力,在恢复过程中引起了列车的振动,需要研究列车的自由振动行为。通过试验平台测试得到不同悬浮间隙下高温超导体和永磁轨道之间的悬浮力,构造悬浮力的经验公式,基于经验公式建立列车自由振动下的动力学模型。利用无量纲化方法对动力学模型进行处理得到弱非线性系统,利用多尺度法对弱非线性系统进行解析求解,将近似解析解与数值解进行对比验证其正确性。基于近似解析解得到自由振动时列车的位移和最大加速度表达式,研究系统参数比阻尼和比刚度对最大加速度的影响规律,研究表明最大加速度随着比阻尼和比刚度的增大而增大。基于磁悬浮列车安全性和舒适性标准,提出一种判断系统参数可行域的解析方法,研究表明可行域呈现近似的三角形区域,并处于三角形的内部。这些研究结果为该类型磁悬浮列车磁轨关系的参数设计提供依据。

关键词：高温超导磁悬浮列车多尺度法振动特性参数可行域