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Preparation of Eco-Friendly High-Performance Manganese Dioxide Supercapacitors by Linear Sweep Voltammetry

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Journal of Renewable Materials 2023年第1期11卷 79-91页

作者： Junshan Zhao yihan shi Ming Zhang Liu Zhang Xumei Cui Xinghua Zhu Jitong Su Dandan Jing Dingyu Yang College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu610225China College of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou635000China

In this paper,the non-polluting,non-toxic,and eco-friendly material-MnO_(2)electrodes were deposited on three-dimensional porous nickel(Ni)foam by linear sweep voltammetry,and the entire electrodeposition process did not require sintering of the material,which was fast and convenient while avoiding unnecessary energy consump-tion and thus was environmentally *** electron microscopy(SEM)and transmission electron microscopy were used to examine the surface and microscopic characteristics of each sample(TEM).Chronoam-perometry(CA),cyclic voltammetry(CV),galvanostatic charge/discharge(GCD),and electrochemical impedance spectroscopy(EIS)were then used to determine the electrochemical characteristics of the manufactured *** result suggests that the MnO_(2)-sv80 electrode sample at a scan rate of 80 mV/s^(−1)has excellent performance for the supercapacitor *** specific capacitance was as high as 531.4 F g^(−1)at a current density of 1 A g^(−1)and remained at 223.2 F g^(−1)at an ultra-high current density of 20 A g^(−1),with capacitance retention of 42%.

关键词： MnO_(2) supercapacitor nanorods nanospheres high capacitance green technology

Passengers gathering-scattering analysis at the corners of subway stations

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Digital Transportation and Safety

Digital Transportation and Safety 2023年第2期2卷 139-149页

作者： Jie Xu yihan shi Hui Zhang State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Beijing Jiaotong UniversityBeijing 100044China Henan Rail Transit Research Institute Co. Ltd.Zhengzhou 450000China Nanjing Police University Nanjing 210023China

During both daily operation and emergency evacuation,the corners of walking facilities in subway stations play an important role in efficient ***,the effectiveness of the corner is difficult to *** this paper,a method of passenger gathering and scattering analysis based on queueing models was proposed to investigate the corner performance in subway ***,we constructed a set of state spaces of passenger flow according to passenger density and proposed the state transition model of passenger ***,the model of passenger flow blocking and unblocking probability were also ***,to illustrate the validity of the method and model,several passenger gathering-scattering scenarios and were simulated to verify the influence of passenger distribution and facility width on passenger walking,and the blocking probability,throughput,and expected time were also analyzed under various widths of the target corridor and arrival *** showed that the proposed model can reproduce the trend of walking parameters changing and the self-organizing phenomenon of'faster is lower'.With the increase of arrival rates of passengers,walking speeds of passengers decrease and the expected walking time is prolonged,and the blocking probability sharply increased when the arrival rate exceeded 7 peds/*** addition,with change of width of the target facility,efficiency of capacity of walking circulation facility *** the width of the target corridor enlarged by 10%,the steady state of passenger flow was less ***,corridor width is critical to the circulation efficiency of passengers in subway *** conclusions will help to develop reasonable passenger flow control plans to ease the jam and keep passengers walking safely.

关键词： Subway station Corner Gathering-scattering behavior Queueing model Transition probability model

Research on Fire Scenario Primitives in Subway Station based on Object-oriented thinking

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Research on Fire Scenario Primitives in Subway Station based...

Low‑Cost,Scalable Fabrication of All‑Fabric Piezoresistive Sensors via Binder‑Free,In‑Situ Welding of Carbon Nanotubes on Bicomponent Nonwovens

第32届中国控制与决策会议

作者： yihan shi Jie Xu Hui Zhang Zhen Yuan State Key Laboratory of Rail Control and Safety Beijing Jiaotong University School of Traffic and Transportation Beijing Jiaotong University Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Research and Development Center of Transport Industry of Technologies and Equipment of Urban Rail Operation Safety Management MOTPRC

Because of inherent characteristics of subway station,such as the complicated structure in the underground,the dense passenger flow and limited evacuation conditions,it may lead to unpredictable losses once the emergency *** "scenario-response" model is considered as the most effective emergency management mode to deal with emergencies such as ***,in order to analyze the fire scenario evolution network of subway station,we construct the fire scenario evolution primitives of subway station based on knowledge element theory in this ***,an expression method of scenario evolution primitive is proposed based on object-oriented thinking,to further solve the problem of rational allocation of emergency resources at key nodes of scenario evolution network by computer *** fire scenario evolution primitives of subway station and the logical relationship among that are extracted from the four aspects of decomposition,abstraction,modularization and encapsulation of ***,from the perspective of the real situation in the subway station,we instantiate the class of disaster body scenario evolution based on object-oriented thinking to verify the validity and applicability of proposed method.

关键词： Object-oriented Subway Station Fire Scenario Evolution Primitive

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Advanced Fiber Materials 2024年第1期6卷 120-132页

作者： Guangliang Tian yihan shi Jixia Deng Wenhua Yu Leihang Yang Yi Lu Yi Zhao Xiangyu Jin Qinfei Ke Chen Huang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of TextilesDonghua UniversityShanghai 201620China Shanghai Frontiers Science Center of Modern Textiles Donghua UniversityShanghai 201620China Department of Respiratory Medicine Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200233China Henan Key Laboratory of Medical and Protective Products Henan Yadu Industry Co.Ltd.Xinxiang 453000China

Wearable piezoresistive sensors have shown enormous application prospects in flexible electronics and human-machine ***,current piezoresistive sensors suffer from common deficiencies including high fabrication cost,poor comfort and low attachment fastness of conductive substances on substrates,thereby impeding their large-scale production and practical ***,a three-dimensional all-fabric piezoresistive sensor is reported based on coating multi-wall carbon nanotubes(MWCNTs)on bicomponent nonwovens composed of core-sheath *** combination of core-sheath fibers with a heat-induced welding strategy greatly improves the adhesion fastness and stability of MWCNT *** multi-layered all-fabric structure provides as-prepared sensors with high sensitivity(9.43%kPa^(-1)in 0-10 kPa and 0.076%kPa^(-1)in 20-120 kPa),wide pressure-sensing range(0-120 kPa),fast response/relaxation time(100 and 60 ms),good reproducibility and air *** of the sensor is demonstrated through the detection of human activities(such as pulse,cough and joint movements)and the wireless monitoring of forefinger ***,our sensor is fabricated out of cost-effective materials,using scalable approach without using glue or *** method established in this work may provide an efficient strategy for the design and production of high-performance all-fabric piezoresistive sensors.

关键词： Piezoresistive pressure sensors Core-sheath fibers All-fabric Multi-wall carbon nanotubes In-situ welding

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碳材料用于创伤止血的研究进展

材料导报 2024年第9期38卷 28-40页

作者：史一涵贺建林丁晟杨焜侯可心李钒中国人民解放军军事科学院卫勤保障技术研究所天津300161 联勤保障部队第920医院昆明650032

无法控制的出血是导致战现场伤员死亡的重要原因,因此开发能够快速止血且具有一定急需功能(如抗菌)的材料具有重要意义,可有效保护伤员和降低死亡率。目前常用的有机和无机止血材料均存在一定的不足之处,如环境适应性较差、止血性能不... 详细信息

无法控制的出血是导致战现场伤员死亡的重要原因,因此开发能够快速止血且具有一定急需功能(如抗菌)的材料具有重要意义,可有效保护伤员和降低死亡率。目前常用的有机和无机止血材料均存在一定的不足之处,如环境适应性较差、止血性能不稳定以及潜在的毒副作用等。碳材料一般都具有原料广泛、成本低廉、生物相容性良好、表面易修饰等特点,已经在创伤敷料应用中初步显示出较好的发展前景。本文概括了几种传统和新型的典型碳材料在快速止血和其他创伤救治领域的应用情况,总结了碳材料作为止血剂和创伤敷料等的性能、作用机制及相关制备方法,最后对碳材料用于创伤止血提出了建议和展望。碳材料有望成为战现场和院前急救中一种较为理想的创伤止血敷料。

关键词：碳材料止血抗菌创伤敷料

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面向多角度文字检测的旋转交并比神经网络

计算机应用与软件 2023年第2期40卷 230-235页

作者：姚宏扬仝明磊施漪涵上海电力大学电子与信息工程学院上海200090

边界框回归是文字检测中关键的步骤,为了更好地预测边界框和收敛网络参数,在Faster RCNN目标检测算法的基础上提出一种利用旋转交并比损失函数的神经网络。该损失函数根据文字检测的评价指标而设计,增加预测框的角度参数,将其与宽和高... 详细信息

边界框回归是文字检测中关键的步骤,为了更好地预测边界框和收敛网络参数,在Faster RCNN目标检测算法的基础上提出一种利用旋转交并比损失函数的神经网络。该损失函数根据文字检测的评价指标而设计,增加预测框的角度参数,将其与宽和高的参数一起代入损失函数的惩罚项,代替了原版用于边界框回归的smooth L1损失函数,转化为交并比的损失向神经网络进行反向传播,并着重优化边界框的方向信息,通过设计与角度惩罚项相同的阈值运算作为非极大值抑制来输出检测结果。在公开文字检测数据集ICDAR2015上的实验结果表明,该方法有效提高了网络的收敛速度和检测精准度,比原方法综合提升11百分点左右。

关键词：文字检测神经网络损失函数边界框回归交并比

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可控硅无功电源的原理和实验研究

华北电力学院学报 1985年第2期 1-12页

作者：杨以涵石新春华北电力学院电力系华北电力学院电力系

可控硅无功电源是一种新型的静止无功功率电源,它和电容器不同,不是靠储能元件,而是靠可控硅的强制换相能力,强迫电流越前(或滞后)于电压,从而产生(或吸收)无功功率。可控硅无功电源的研究工作在国外也刚刚起步。本文探讨了这种无功电... 详细信息

可控硅无功电源是一种新型的静止无功功率电源,它和电容器不同,不是靠储能元件,而是靠可控硅的强制换相能力,强迫电流越前(或滞后)于电压,从而产生(或吸收)无功功率。可控硅无功电源的研究工作在国外也刚刚起步。本文探讨了这种无功电源的工作原理,在此基础上进行了单相可控硅无功电源的物理模拟实验,验证了原理分析的正确性,为进一步研究正式装置做了准备工作。

关键词：无功电源调相机逆变器换相可控硅控制波形图静止补偿器越前物理模拟实验感性无功

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先天性无痛无汗症诊治的进展

中华医学遗传学杂志 2024年第9期41卷 1139-1143页

作者：顾嘉颉刘泽楷时易涵顾加祥扬州大学医学院扬州225001 南京医科大学南京210029 扬州大学附属苏北人民医院手足显微外科扬州225001

先天性无痛无汗症(CIPA)是一种罕见的疾病,主要的发病人群为婴幼儿、儿童和青少年。作为一种常染色体隐性遗传病,CIPA又称家族性自主神经功能异常2型,其诊断主要依靠临床观察和基因检测。该病目前尚无有效的治疗方法,主要通过降温、抗... 详细信息

先天性无痛无汗症(CIPA)是一种罕见的疾病,主要的发病人群为婴幼儿、儿童和青少年。作为一种常染色体隐性遗传病,CIPA又称家族性自主神经功能异常2型,其诊断主要依靠临床观察和基因检测。该病目前尚无有效的治疗方法,主要通过降温、抗炎等对症处理和加强监护。本文回顾了该病的相关文献,总结对其的研究进展,以期提高临床医师对于该病的认识。

关键词：先天性无痛无汗症基因遗传诊断治疗

基于RefineNet特征融合的改进EAST场景文本检测方法

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计算机应用与软件 2022年第4期39卷 223-227,319页

作者：张魁仝明磊施漪涵唐丽上海电力大学电子与信息工程学院上海200090

特征融合是文本检测算法的重要步骤。为提升文本检测的召回率和准确率,提出一种利用RefineNet(Refinement Network)网络进行特征融合的改进EAST(Efficient and Accurate Scene Text Detector)算法。以ResNet(Residual Network)残差网络作为特征提取层的骨干网络,提取出2-5层的特征图;用RefineNet取代East模型中的维度拼接算法,融合多分辨率特征,将4路特征图合并成1路RCU(Residual Conv Unit)输出;经过卷积、池化和上采样等操作在输出层得到文本框的置信度、文本框的位置信息以及文本框旋转角度,通过非最大值抑制输出检测结果。实验结果表明,在相同实验环境条件下,采用该方法比原EAST方法准确率提高约2百分点,召回率提高约8百分点。

关键词：文本检测残差网络特征提取特征融合