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Geometric phase-encoded stimuli-responsive cholesteric liquid crystals for visualizing real-time remote monitoring:humidity sensing as a proof of concept

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Light(Science & Applications) 2024年第2期13卷 283-293页

作者： Shi-Long Li zhao-yi chen Peng chen Wei Hu Chaohong Huang Sen-Sen Li Xuejia Hu Yan-Qing Lu Lu-Jian chen Department of Electronic Engineering School of Electronic Science and EngineeringXiamen University361005 XiamenChina College of Engineering and Applied Sciences Nanjing University210093 NanjingChina Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University361005 XiamenChina

Liquid crystals are a vital component of modern photonics,and recent studies have demonstrated the exceptional sensing properties of stimuli-responsive cholesteric liquid ***,existing cholesteric liquid crystal-based sensors often rely on the naked eye perceptibility of structural color or the measurement of wavelength changes by spectrometric tools,which limits their practical ***,developing a platform that produces recognizable sensing signals is *** this study,we present a visual sensing platform based on geometric phase encoding of stimuli-responsive cholesteric liquid crystal polymers that generates real-time visual patterns,rather than frequency *** demonstrate this platform’s effectiveness,we used a humidity-responsive cholesteric liquid crystal polymer film encoded with a q-plate pattern,which revealed that humidity causes a shape change in the vortex beam reflected from the encoded cholesteric liquid crystal ***,we developed a prototype platform towards remote humidity monitoring benefiting from the high directionality and long-range transmission properties of laser beams carrying orbital angular *** approach provides a novel sensing platform for cholesteric liquid crystals-based sensors that offers promising practical *** ability to generate recognizable sensing signals through visual patterns offers a new level of practicality in the sensing field with stimuli-responsive cholesteric liquid *** platform might have significant implications for a broad readership and will be of interest to researchers working in the field of photonics and sensing technology.

关键词： humidity visual liquid

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新课标背景下高中语文古诗词教学研究

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语文教学之友 2024年第7期43卷 35-38页

作者：刘宏英赵奕辰河北北方学院文学院

《普通高中语文课程标准(2017年版2020年修订)》要求在古诗词教学中培养学生的核心素养,注重学生在学习中的过程性评价,并在古诗词教学中构建学习任务群。因此,教师要在此基础上根据统编版高中语文教材中古诗词的选编特点展开教学。首先... 详细信息

《普通高中语文课程标准(2017年版2020年修订)》要求在古诗词教学中培养学生的核心素养,注重学生在学习中的过程性评价,并在古诗词教学中构建学习任务群。因此,教师要在此基础上根据统编版高中语文教材中古诗词的选编特点展开教学。首先,利用教材中的新系统进行教学;其次,要依据教材的特点教学;最后,要在古诗词教学中提高学生的审美能力,从而培养学生的核心素养,改进教学手段。

关键词：新课标高中语文古诗词教学

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建筑钢结构用热轧H型钢与焊接H型钢的应用现状及展望

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包钢科技 2024年第2期50卷 52-57页

作者：黄飞冯岩青邢磊赵一臣乌海市包钢万腾钢铁有限责任公司内蒙古乌海016000 包头职业技术学院内蒙古包头014030 内蒙古科技大学内蒙古包头014010 北京津西绿建科技产业集团有限公司北京100020

我国钢结构用钢材以板材为主,热轧H型钢(RH)在钢结构上的应用增长缓慢,其中热轧H型钢用量仅占H型钢总量的15%,占比偏低,其余为焊接H型钢。文章从焊接H型钢(BH)与热轧H型钢(RH)的规格、种类、生产工艺、残余应力、R角处组织、优劣势及未... 详细信息

我国钢结构用钢材以板材为主,热轧H型钢(RH)在钢结构上的应用增长缓慢,其中热轧H型钢用量仅占H型钢总量的15%,占比偏低,其余为焊接H型钢。文章从焊接H型钢(BH)与热轧H型钢(RH)的规格、种类、生产工艺、残余应力、R角处组织、优劣势及未来发展趋势等几方面进行对比分析,并提出热轧H型钢在建筑钢结构上应用瓶颈的几点对策。

关键词：钢结构焊接H型钢热轧H型钢

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Ablative behavior and mechanism of SiC_(f) /SiBCZr composites prepared by PIP process

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Journal of Advanced Ceramics 2024年第1期13卷 124-134页

作者： Mingwei chen Yuliang zhao Haipeng Qiu Shijian Liu Weijie Xie yi chen Qiyue Zhang AVIC Manufacturing Technology Institute Beijing 100130China

SiC_(f)/SiBCZr composites were prepared by polymer precursor impregnation and pyrolysis process with near stoichiometric ratio SiC fiber preform as reinforcement phase and SiBCZr multiphase ceramic precursor as impregnating *** results highlighted that the SiC_(f)/SiBCZr composites exhibited excellent ablative properties after ablative tests at 1200℃/3600 s and 1400℃/3600 s,and the strength retention rates of the composites reached 90%and 85%,*** was mainly due to the liquid sealing effect of the ablative products represented by B2O_(3) and SiO_(2)∙B_(2)O_(3),which inhibited the ablative reaction by reducing the diffusion rate of the oxidation medium,and the solid pinning effect of the substances represented by SiO_(2),ZrO_(2),and ZrSiO_(4),which could play high viscosity and high strength characteristics to improve anti-erosion *** above-mentioned SiC_(f)/SiBCZr composites with corrosion resistance,oxidation resistance,and ablative resistance provided a solid material foundation and technical support for the development of reusable spacecraft hot-end components.

关键词： near stoichiometric ratio SiC fiber SiC_(f)/SiBCZr composite liquid sealing effect solid pinning effect

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Flexible and multifunctional triboelectric nanogenerator based on liquid metal/polyvinyl alcohol hydrogel for energy harvesting and self-powered wearable human-machine interaction

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Rare Metals 2024年第3期43卷 1186-1196页

作者： Hou-Wang Zhou Cong zhao Ze-Yu zhao Jun-chen Jiang Hui-Le Jin Shun Wang Shuang Pan Min-yi Xu yi-Huang chen Hai-Ming Jin Department of Orthopaedics The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhou325027China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China Dalian Key Laboratory of Marine Micro/Nano Energy and Self-Powered Systems Marine Engineering CollegeDalian Maritime UniversityDalian116026China

Hydrogel-based triboelectric nanoge nerator(TENG)has a promising applied prospect in wearable electronic ***,its low performance,poor stability,insufficient recyclability and inferior self-healing seriously hinder its ***,we report a robust route to a liquid metal(LM)/polyvinyl alcohol(PVA)hydrogel-based TENG(LP-TENG).Owing to the intrinsically liquid feature of conductive LM within the flexible PVA hydrogel,the as-prepared LP-TENG exhibited comprehensiye advantages of adaptability,biocompatibility,outstanding electrical performance,superior stability,recyclability and diverse applications,which were unattainable by traditional ***,the LP-TENG delivered appealing open circuit voltage of 250 V,short circuit current of 4μA and transferred charge of 120 nC with high stability,outperforming most advanced TENG *** LP-TENG was successfully employed for versatile applications with multifunctionality,including human motion detection,handwriting recognition,energy collection,message transmission and human-machine *** work presents significant prospects for crafting advanced materials and devices in the fields of wearable electronics,flexible skin and smart robots.

关键词： Liquid metal Hydrogel Wearable TENG Multifunctionality Human-machine interaction

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YOLOv5ST:A Lightweight and Fast Scene Text Detector

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Computers, Materials & Continua 2024年第4期79卷 909-926页

作者： yiwei Liu yingnan zhao yi chen Zheng Hu Min Xia School of Computer and Science Nanjing University of Information Science and TechnologyNanjing210044China School of Automation Nanjing University of Information Science and TechnologyNanjing210044China

Scene text detection is an important task in computer *** this paper,we present YOLOv5 Scene Text(YOLOv5ST),an optimized architecture based on YOLOv5 v6.0 tailored for fast scene text *** primary goal is to enhance inference speed without sacrificing significant detection accuracy,thereby enabling robust performance on resource-constrained devices like drones,closed-circuit television cameras,and other embedded *** achieve this,we propose key modifications to the network architecture to lighten the original backbone and improve feature aggregation,including replacing standard convolution with depth-wise convolution,adopting the C2 sequence module in place of C3,employing Spatial Pyramid Pooling Global(SPPG)instead of Spatial Pyramid Pooling Fast(SPPF)and integrating Bi-directional Feature Pyramid Network(BiFPN)into the *** results demonstrate a remarkable 26%improvement in inference speed compared to the baseline,with only marginal reductions of 1.6%and 4.2%in mean average precision(mAP)at the intersection over union(IoU)thresholds of 0.5 and 0.5:0.95,*** work represents a significant advancement in scene text detection,striking a balance between speed and accuracy,making it well-suited for performance-constrained environments.

关键词： Scene text detection YOLOv5 lightweight object detection

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Effect of rare earth on primary carbides in H13 die steel and their addition method:a review

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Journal of Iron and Steel Research(International) 2024年第3期31卷 531-551页

作者： Jing-feng Wang Lin-zhu Wang Chao-yi chen Xiang Wang Fei zhao School of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina Zhengzhou Railway Vocational and Technical College Zhengzhou 450000HenanChina Guizhou Provincial University Key Laboratory of High Performance Battery Materials Guizhou UniversityGuiyang 550025GuizhouChina Shougang Guiyang Special Steel Co. Guiyang 550005GuizhouChina

Larger-sized primary carbides lead to stress concentration during the application of H13 hot-work die steel,resulting in microcracks and fatigue *** earth was usually added to modify the carbides and *** existing literature is reviewed on the effect of rare earth on primary carbides in H13 steel.A comprehensive review on the effect of rare earth on the characteristics of primary carbides,i.e.,number,size,morphology,and thermal stability in H13 steel,was *** precipitation mechanism and nucleation of primary carbides with rare earth were *** position and form of rare earth in steel and their effects on alloying elements segregation were *** addition techniques of rare earth in H13 steel were compared,and the prospects for other uncommon rare earth and emerging technology were *** on the current references,it can be known that adding rare earth facilitated refined and dispersed primary *** size of primary carbides would be reduced,and their morphology would be improved because the rare earth inclusions formed in H13 steel can act as nucleation cores forγ-Fe orδ-Fe,refining the dendritic ***,the number of primary carbides at grain boundaries would be significantly ***,rare earth had little impact on thermal *** nucleation of primary carbides tended to be inhibited due to the modification of inclusions by rare earth which were likely to be nucleation cores for primary *** earth had been reported to affect the mechanism and process of primary carbide ***,the addition of rare earth can inhibit the segregation of alloying elements and carbon diffusion by ***,laboratory experiments and theoretical calcu-lations need to be conducted to study the states and evolution of rare earth steels.

关键词： Rare earth H13 die steel Primary carbide Nucleation Dendritic structure

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阻塞性睡眠呼吸暂停综合征对急性心肌梗死患者左心室功能、NT-proBNP、ET-1、GDF-15的影响

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现代生物医学进展 2024年第3期24卷 448-453页

作者：刘俊楠黄晓莉马健赵逸辰章夏鹰上海交通大学附属第六人民医院心脏中心上海200233

目的:探讨阻塞性睡眠呼吸暂停综合征(OSAHS)对急性心肌梗死(AMI)患者左心室功能、N末端B型利钠肽原(NT-proBNP)、内皮素1(ET-1)、生长分化因子-15(GDF-15)的影响。方法:选取2020年3月至2022年6月于上海交通大学附属第六人民医院行急诊PC... 详细信息

目的:探讨阻塞性睡眠呼吸暂停综合征(OSAHS)对急性心肌梗死(AMI)患者左心室功能、N末端B型利钠肽原(NT-proBNP)、内皮素1(ET-1)、生长分化因子-15(GDF-15)的影响。方法:选取2020年3月至2022年6月于上海交通大学附属第六人民医院行急诊PCI的AMI患者136例,根据呼吸暂停低通气指数(AHI)水平将患者分为非OSAHS组(48例)、轻度OSAHS组(31例)、中度OSAHS组(29例)和重度OSAHS组(28例)。均行心脏超声检查左心室功能指标[左室短轴缩短率(LVFS)、左室射血分数(LVEF)],检测血清NT-proBNP、ET-1、GDF-15、肌酸激酶(CK)、肌酸激酶同工酶MB(CK-MB)、乳酸脱氢酶(LDH)、α-羟丁酸脱氢酶(α-HBDH)水平。采用Pearson相关分析LVFS、LVEF、NT-proBNP、ET-1、GDF-15与AHI的相关性;采用多因素Logistic回归分析AMI合并OSAHS的影响因素。结果:(1)四组患者LVFS、LVEF比较,重度OSAHS组中度OSAHS组>轻度OSAHS组>非OSAHS组(P中度OSAHS组>轻度OSAHS组>非OSAHS组(P<0.05)。(4)Pearson相关性分析显示:AMI患者LVFS、LVEF与AHI均呈负相关(r=-0.632、-0.573,P<0.05),NT-proBNP、ET-1、GDF-15水平与AHI均呈正相关(r=0.596、0.542、0.517,P<0.05)。(5)Logistic回归分析显示:LVFS(OR=6.379,95%CI:3.215~9.543)、LVEF(OR=3.016,95%CI:1.364~4.668)、NT-proBNP(OR=5.171,95%CI:2.316~8.025)、ET-1(OR=2.751,95%CI:1.334~4.168)、GDF-15(OR=2.447,95%CI:1.143~3.752)、CK(OR=4.108,95%CI:1.615~6.602)、CK-MB(OR=4.500,95%CI:1.860~7.139)、LDH(OR=3.435,95%CI:1.407~5.463)是影响AMI合并OSAHS的独立危险因素(P<0.05)。结论:随着OSAHS病情进展可能加重AMI患者心功能、血管内皮功能、心肌损伤程度,血清NT-proBNP、ET-1、GDF-15水平升高可能是影响AMI患者并发OSAHS的危险因素。

关键词：急性心肌梗死阻塞性睡眠呼吸暂停综合征左心室功能 N末端B型利钠肽原内皮素1 生长分化因子-15

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Boosting charge transfer via interface charge reconstruction between amorphous NiFe-LDH and crystalline NiCo_(2)O_(4)for efficient alkaline water/seawater oxidation

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Nano Research 2024年第6期17卷 4856-4863页

作者： Zhonghang Xing yi zhao Yunhai Wang Xiaohe Liu Zhiqiang Guo Qingyun chen International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China China School of Geology and Environment Xi’an University of Science and TechnologyXi’an 710049China Changqing Engineering Design Co. Ltd.Xi’an 710018China

Electrocatalysts with optimal efficiency and durability for the oxygen evolution reaction(OER)are becoming increasingly important as the demand for alkaline water/seawater electrolysis technology ***,a novel rose-shaped NiFe-layered double hydroxide(LDH)/NiCo_(2)O_(4)composed of amorphous wrinkled NiFe-LDH and highly crystalline NiCo_(2)O_(4)was synthesized with rich *** unsaturated metal sites are generated due to significant charge reconstruction at the heterointerface between the crystalline and amorphous *** metal sites could trigger and provide more active *** density functional theory(DFT)reveals that a new charge transfer channel(Co-Fe)was formed at the heterointerface between NiFe-LDH as electron acceptor and NiCo_(2)O_(4)as electron *** new charge transfer channel boosts interfacial charge transfer and enhances catalytic *** NiFe-LDH/NiCo_(2)O_(4)/nickel foam(NF)drives current densities of 10 and 100 mA·cm−2 with overpotentials of 193 and 236 mV,*** composite electrode demonstrates a fast turnover frequency(0.0143 s−1)at 1.45 V ***(RHE=reversible hydrogen electrode),which is 5.5 times greater than pure NiCo_(2)O_(4),suggesting its superior intrinsic ***,NiFe-LDH/NiCo_(2)O_(4)/NF electrode exhibited negligible degradation after 150 h of uninterrupted running in alkaline seawater *** study introduces a method for preparing high-efficiency electrocatalysts utilized in alkaline water/seawater electrolysis.

关键词： NiFe-layered double hydroxide(LDH)/NiCo_(2)O_(4)/nickel foam(NF) heterogeneous interfaces charge reconstruction water/seawater electrolysis

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Knockdown of NADPH oxidase 4 reduces mitochondrial oxidative stress and neuronal pyroptosis following intracerebral hemorrhage

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Neural Regeneration Research 2023年第8期18卷 1734-1742页

作者： Bo-Yun Ding Chang-Nan Xie Jia-Yu Xie Zhuo-Wei Gao Xiao-Wei Fei En-Hui Hong Wen-Jin chen yi-zhao chen Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration Department of NeurosurgeryZhujiang HospitalThe National Key Clinical SpecialtyThe Neurosurgery Institute of Guangdong ProvinceThe Engineering Technology Research Center of Education Ministry of ChinaSouthern Medical UniversityGuangzhouGuangdong ProvinceChina Department of Spinal Surgery Orthopedic Medical CenterZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina Department of Traditional Chinese Medicine The Third Affiliated Hospital of Southern Medical UniversityGuangzhouGuangdong ProvinceChina Department of Neurosurgery Xijing HospitalAir Force Military Medical UniversityXi’anShaanxi ProvinceChina Department of Neurosurgery Peking University Shenzhen HospitalShenzhen Peking University-The Hong Kong University of Science and Technology Medical CenterShenzhenGuangdong ProvinceChina Department of Neurosurgery The First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouGuangdong ProvinceChina

Intracerebral hemorrhage is often accompanied by oxidative stress induced by reactive oxygen species,which causes abnormal mitochondrial function and secondary reactive oxygen species *** creates a vicious cycle leading to reactive oxygen species accumulation,resulting in progression of the pathological ***,breaking the cycle to inhibit reactive oxygen species accumulation is critical for reducing neuronal death after intracerebral *** previous study found that increased expression of nicotinamide adenine dinucleotide phosphate oxidase 4(NADPH oxidase 4,NOX4)led to neuronal apoptosis and damage to the blood-brain barrier after intracerebral *** purpose of this study was to investigate the role of NOX4 in the circle involving the neuronal tolerance to oxidative stress,mitochondrial reactive oxygen species and modes of neuronal death other than apoptosis after intracerebral *** found that NOX4 knockdown by adeno-associated virus(AAV-NOX4)in rats enhanced neuronal tolerance to oxidative stress,enabling them to better resist the oxidative stress caused by intracerebral *** of NOX4 also reduced the production of reactive oxygen species in the mitochondria,relieved mitochondrial damage,prevented secondary reactive oxygen species accumulation,reduced neuronal pyroptosis and contributed to relieving secondary brain injury after intracerebral hemorrhage in ***,we used a mitochondria-targeted superoxide dismutase mimetic to explore the relationship between reactive oxygen species and *** mitochondria-targeted superoxide dismutase mimetic inhibited the expression of NOX4 and neuronal pyroptosis,which is similar to the effect of *** indicates that NOX4 is likely to be an important target for inhibiting mitochondrial reactive oxygen species production,and NOX4 inhibitors can be used to alleviate oxidative stress response induced by intracerebral hemorrhage.

关键词： caspase 1 caspase4/11 gasdermin D intracerebral hemorrhage mitochondria reactive oxygen species inhibitor NADPH oxidase 4 neuronal pyroptosis neuronal tolerance reactive oxygen species secondary brain injury

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