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Chinese Chemical Letters 2020年第5期31卷 1141-1146页

作者： Ximing Pu xingxing zhou Zhongbing Huang Guangfu Yin Xianchun Chen College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Non-nerve cell-derived extracellular matrix(ECM)wa s coated on the aligned porous polypyrrole-poly(Llactide)(PPy-PLLA)fiber-films with the conductivity of^12 mS/m via L929 cells culture and lysing,resulting in^10%increase of PC12 cells attachment and^26μm increase of neurites length.The neurite length of^149μm in EGF/NGF group(optimal concentration radio of 12.5/50(ng/mL))on aligned and ECM-conjugated fiber-films was significantly larger than^94μm in only NGF group(50 ng/mL),confirming the synergy of EGF,NGF and aligned ECM-conjuaged PPy-PLLA fibers.When differentiated PC12 cells were exerted electrical stimulation(ES)of 100 mV/cm for 4 h/day in 2 day through ECM-PPyPLLA fiber-films,their neurite length reached to^251μm,significantly larger than^149μm of group without ES,due to the higer expression of related neural proteins in ES group.A simple mechanism was proposed to analyze synergistical effect of ECM,EGF,NGF on axons adhesion and elongation along the aligned ECM-coated fibers under ES condition.

关键词： Extracellular matrix Axonal growth Conducting PPy-PLLA fiber-film Nerve growth factor Epidermal growth factor Electrical stimulation

基于改进布谷鸟搜索算法的光伏最大功率点跟踪策略

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天津理工大学学报 2024年第3期40卷 24-31页

作者：李季周星兴天津理工大学天津市复杂系统控制理论及应用重点实验室天津300384 天津理工大学电气工程与自动化学院天津300384

实际工程中,光伏阵列在随机变化的环境中会出现局部遮光的情况,从而导致光伏阵列的功率-电压特性曲线会呈现多峰值状态,传统的最大功率点跟踪(maximum power point tracking, MPPT)算法易陷入局部最优解,追踪速度和精准度无法得到满足... 详细信息

实际工程中,光伏阵列在随机变化的环境中会出现局部遮光的情况,从而导致光伏阵列的功率-电压特性曲线会呈现多峰值状态,传统的最大功率点跟踪(maximum power point tracking, MPPT)算法易陷入局部最优解,追踪速度和精准度无法得到满足。针对这一问题,提出一种基于布谷鸟搜索算法(cuckoo search algorithm, CS)和电导增量法(conductivity increment method, CI)结合的光伏MPPT算法,在算法前期利用布谷鸟搜索算法将大步长和小步长交替使用使得全局搜索能力增强,找到全局最大功率点所处区域附近;在后期,采用步长小、控制精度高的CI进行局部寻优,快速准确地锁定到最大功率点。在MATLAB/Simulink中搭建仿真模型,并与原始布谷鸟搜索算法和粒子群优化(particle swam optimization, PSO)算法进行比较。仿真结果表明,将CS与CI结合的算法使得收敛速度更快,精度更高,稳定状态时功率曲线的波动更小。

关键词：多峰现象布谷鸟搜索算法电导增量法混合控制最大功率点跟踪

3D-cubic interconnected porous Mg-based scaffolds for bone repair

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Journal of Magnesium and Alloys 2021年第4期9卷 1336-1345页

作者： Qiangsheng Dong Yang Li Huiqin Jiang xingxing zhou Huan Liu Mengmeng Lu Chenglin Chu Feng Xue Jing Bai Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou 215000China College of Mechanics and Materials Hohai UniversityNanjing 211100China Department of Oral Implantology Affiliated Hospital of StomatologyNanjing Medical UniversityNanjing 210029China

Mg-based porous materials,as potential bone tissue engineering scaffolds,are considered an attractive strategy for bone repair owing to favorable biodegradability,good biocompatibility and suitable mechanical properties.In this work,3D-cubic interconnected porous Mg–xZn–0.3Ca(x=0,3,6)scaffolds were prepared to obtain desirable pore structures with a mean porosity up to 73%and main pore size of 400–500μm,which pore structures were close to the human cancellous bone.The structure–property relationships in the present scaffolds were analyzed by experiments and theoretical models of generalized method of cells(GMC).Mg–xZn–0.3Ca scaffolds exhibited good compression properties with a maximum above 5MPa in yield strength and about 0.4GPa in elastic modulus.This was attributed to not only the alloy strengthening but also the large minimum solid area.On the other hand,the scaffolds showed undesirable and relatively serious degradation behavior in Hank’s solution,resulting from Zn addition in Mg-based scaffolds and the high surface area ratio in the pore structure.Therefore,surface modifications are worth studying for controlled degradation in the future.In conclusion,this research would explore a novel attempt to introduce 3D-cubic pore structure for Mg-based scaffolds,and provide new insights into the preparations of Mg-based scaffolds with good service performances for bone repair.

关键词： Mg-based scaffolds 3D-cubic pore Structure Mechanical property Degradation behavior

Insights into self-healing behavior and mechanism of dicalcium phosphate dihydrate coating on biomedical Mg

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Bioactive Materials 2021年第1期6卷 158-168页

作者： Qiangsheng Dong xingxing zhou Yuanjia Feng Kun Qian Huan Liu Mengmeng Lu Chenglin Chu Feng Xue Jing Bai School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou215000China College of Mechanics and Materials Hohai UniversityNanjing211100China Department of Oral Implantology Affiliated Hospital of StomatologyNanjing Medical UniversityNanjing210029China

Self-healing coatings have been developed as smart surface coatings for Mg and its alloys to retain local corrosion from the coating damages.In this study,we prepared dicalcium phosphate dihydrate(DCPD)coating on biomedical Mg,and found that the artificial scratches in DCPD coating can be efficiently sealed by anti-corrosive products in both Hank's and normal saline(NS)solutions.Besides,the in-depth study revealed that DCPD was served as not only a physical barrier but also a self-healing agent,demonstrating an autonomous self-healing coating without embedded extra corrosion inhibitors.Moreover,Hank's solution provided foreign-aid filmforming ions to promote self-healing behavior.The findings might offer new opportunities for further studies and applications of efficient self-healing coatings on biodegradable Mg implants.

关键词： Magnesium Corrosion Coating Microstructure Self-healing

扭矩速率限制电控技术在商用车上的开发与应用研究

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内燃机 2024年第1期40卷 50-56页

作者：周星星朱彬康明斯东亚研发有限公司湖北武汉430056

针对某款商用牵引车在猛踩与猛松油门时出现的整车抖动问题,从理论分析和实际测试两个方面进行了电控特性解决方案的研究。首先,基于理论分析的结果阐述了抖动产生的机理,找出了与整车抖动强相关的因子,并提出了针对性的解决方案和调试... 详细信息

针对某款商用牵引车在猛踩与猛松油门时出现的整车抖动问题,从理论分析和实际测试两个方面进行了电控特性解决方案的研究。首先,基于理论分析的结果阐述了抖动产生的机理,找出了与整车抖动强相关的因子,并提出了针对性的解决方案和调试原则。接着,利用AVL Drive设备进行了试验测试,对比了不同工况下的改善效果。研究结果表明:采用扭矩速率限制电控技术可以有效改善驾驶员在猛踩与猛松油门时整车的扭转振动与冲击度。该技术在整车冲击度不高于16m/s^(3)时,可以提供更好的驾驶体验。

关键词：油门扭转振动冲击度扭矩速率限制 AVL Drive软件

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遮挡条件下多视角甜椒果实点云三维重构方法

农业机械学报 2024年第5期55卷 218-225页

作者：王昱易振峰谭文超郭金菊周星星赵俊宏华南农业大学工程学院广州510642 广东省农业科学院设施农业研究所广州510640

为进行表型原位自动化测量,实现甜椒数字化育种和管理,针对原位果实表型测量中的目标遮挡问题,提出一种多视角甜椒果实点云的三维重构方法。通过虚拟叶片的方法,创建增强数据集,建立基于YOLO v5算法的甜椒果实识别模型,实现对不同遮挡... 详细信息

为进行表型原位自动化测量,实现甜椒数字化育种和管理,针对原位果实表型测量中的目标遮挡问题,提出一种多视角甜椒果实点云的三维重构方法。通过虚拟叶片的方法,创建增强数据集,建立基于YOLO v5算法的甜椒果实识别模型,实现对不同遮挡程度果实的识别,同时,构建考虑果实位置与遮挡程度的果实表型采集算法,实现多视角的果实三维数据采集。最后,配准甜椒果实三维点云,提取甜椒表型参数,并通过温室甜椒果实表型,对点云重构方法的有效性进行验证。相较手动测量数据,果实果宽平均相对误差为1.72%,果高平均相对误差为1.60%。试验结果表明,本文所提出的甜椒原位表型点云重构方法,可为遮挡条件下作物表型提供有效的解决思路和可行方法。

关键词：甜椒表型数据增强遮挡条件点云三维重构 YOLO v5

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矿区潜在有毒元素评价及修复技术综述

当代化工研究 2024年第7期 26-28页

作者：周星星贾凌寒宁夏理工学院建筑与环境学院宁夏753000 沈阳市生态环境保护综合行政执法队辽宁110058

矿区开采在我国的工业化和城市化进程中发挥了不可或缺的作用,由于过度开采,矿区潜在有毒元素(PTEs)污染的问题逐渐凸显。矿区开采过程中PTEs不仅会对当地的生态环境造成破坏,还会通过降雨、地表径流和大气降尘等方式造成大面积的污染,... 详细信息

矿区开采在我国的工业化和城市化进程中发挥了不可或缺的作用,由于过度开采,矿区潜在有毒元素(PTEs)污染的问题逐渐凸显。矿区开采过程中PTEs不仅会对当地的生态环境造成破坏,还会通过降雨、地表径流和大气降尘等方式造成大面积的污染,故开展矿区污染评价和生态治理修复至关重要。本文将围绕矿区PTEs的污染评价方式:内梅罗污染指数、地质累计指数、潜在生态危害指数;矿区生态修复技术:物理修复、化学修复和生物修复技术归纳总结,为今后更好地开展矿区生态修复提供指导。

关键词：潜在有毒元素污染评价生态修复污染治理

BSTFNet:An Encrypted Malicious Traffic Classification Method Integrating Global Semantic and Spatiotemporal Features

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Computers, Materials & Continua 2024年第3期78卷 3929-3951页

作者： Hong Huang xingxing Zhang Ye Lu Ze Li Shaohua zhou School of Computer Science and Engineering Sichuan University of Science&EngineeringYibin644002China School of Mathematics and Statistics Sichuan University of Science&EngineeringYibin644002China

While encryption technology safeguards the security of network communications,malicious traffic also uses encryption protocols to obscure its malicious behavior.To address the issues of traditional machine learning methods relying on expert experience and the insufficient representation capabilities of existing deep learning methods for encrypted malicious traffic,we propose an encrypted malicious traffic classification method that integrates global semantic features with local spatiotemporal features,called BERT-based Spatio-Temporal Features Network(BSTFNet).At the packet-level granularity,the model captures the global semantic features of packets through the attention mechanism of the Bidirectional Encoder Representations from Transformers(BERT)model.At the byte-level granularity,we initially employ the Bidirectional Gated Recurrent Unit(BiGRU)model to extract temporal features from bytes,followed by the utilization of the Text Convolutional Neural Network(TextCNN)model with multi-sized convolution kernels to extract local multi-receptive field spatial features.The fusion of features from both granularities serves as the ultimate multidimensional representation of malicious traffic.Our approach achieves accuracy and F1-score of 99.39%and 99.40%,respectively,on the publicly available USTC-TFC2016 dataset,and effectively reduces sample confusion within the Neris and Virut categories.The experimental results demonstrate that our method has outstanding representation and classification capabilities for encrypted malicious traffic.

关键词： Encrypted malicious traffic classification bidirectional encoder representations from transformers text convolutional neural network bidirectional gated recurrent unit

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新生儿父亲照护体验与角色适应的现象学研究

上海护理 2024年第2期24卷 7-11页

作者：周星星陈琳尚星辰李霖王子承袁媛扬州大学护理学院·公共卫生学院江苏扬州225009 扬州大学附属医院江苏扬州225003

目的探索新生儿父亲对初次分娩的妻子及新生儿的照护体验及其向父亲角色过渡的适应心理。方法采用目的抽样法对妻子于2022年7-9月间初次分娩的12名新生儿父亲进行半结构式访谈,使用Colaizzi七步法进行资料分析。结果针对新生儿父亲照护... 详细信息

目的探索新生儿父亲对初次分娩的妻子及新生儿的照护体验及其向父亲角色过渡的适应心理。方法采用目的抽样法对妻子于2022年7-9月间初次分娩的12名新生儿父亲进行半结构式访谈,使用Colaizzi七步法进行资料分析。结果针对新生儿父亲照护体验与角色适应共提炼出3个主题:(1)多重情绪体验,包括紧张和担忧,期待又害怕,责任意识加强;(2)照护困难,包括缺乏新生儿照护经验,缺乏产妇照护经验,疲惫感倍增;(3)外部支持力度弱,包括与医护人员沟通较少,护理知识普及度不足,环境舒适度欠缺。结论照护母婴有助于新生儿父亲的角色适应,促使其承担家庭责任,有利于亲子关系发展与家庭和睦的维系,但同时新生儿父亲也存在因照护经验缺乏导致压力剧增、睡眠不足导致疲倦感倍增、面对妻子分娩创伤心情难以平复等问题。医护工作者应多加关注此类人群的心理,帮助解答其心中疑虑,指导其掌握母婴照护的注意事项,适时开展多形式的健康宣教活动,以促进整个家庭的和谐稳定。

关键词：首次分娩婴儿新生父亲照护角色适应质性研究

Orthogonal Combinatorial Raman Codes Enable Rapid High-Throughput-Out Library Screening of Cell-Targeting Ligands

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Research 2024年第1期2023卷 199-208页

作者： Yuchen Tang xingxing Zheng Tingjuan Gao China Key Laboratory of Pesticide and Chemical Biology of Ministry of Education College of ChemistryCentral China Normal UniversityWuhan 430079China

High-throughput assays play an important role in the fields of drug discovery,genetic analysis,and clinical diagnostics.Although super-capacity coding strategies may facilitate labeling and detecting large numbers of targets in a single assay,practically,the constructed large-capacity codes have to be decoded with complicated procedures or are lack of survivability under the required reaction conditions.This challenge results in either inaccurate or insufficient decoding outputs.Here,we identified chemical-resistant Raman compounds to build a combinatorial coding system for the high-throughput screening of cell-targeting ligands from a focused 8-mer cyclic peptide library.The accurate in situ decoding results proved the signal,synthetic,and functional orthogonality for this Raman coding strategy.The orthogonal Raman codes allowed for a rapid identification of 63 positive hits at one time,evidencing a high-throughput-out capability in the screening process.We anticipate this orthogonal Raman coding strategy being generalized to enable efficient high-throughput-out screening of more useful ligands for cell targeting and drug discovery.

关键词： enable throughput allowed