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In situ synchrotron X-ray diffraction for actuation in sodium bismuth titanate relaxor ferroelectrics

MATERIALS HORIZONS 2025年 2025 Apr 30页

作者： Jia, Yuxin Fan, Yongbo Lei, lin Su, Yao Zhu, shuwen Dong, Guangzhi Hinterstein, Manuel Li, Qiang Wang, Weijia Fan, Huiqing Northwestern Polytech Univ Sch Elect & Informat Xian 710072 Peoples R China Hong Kong Polytech Univ Dept Appl Phys Kowloon 11 Yucai Rd Hong Kong Peoples R China Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Xidian Univ Sch Adv Mat & Nanotechnol Xian 710071 Peoples R China Fraunhofer Inst Mat Mech Freiburg Germany

Sodium bismuth titanate-based (NBT-based) ergodic relaxor ferroelectrics have garnered significant attention for actuator applications due to their fully reversible electrostrain behavior. In general, it is believed that the electrostain originates from three main aspects: electric field-induced phase transitions with volume changes, non-180 degrees domain switching, and lattice stretching without volume changes. However, the individual contribution remains to be quantitatively understood. In this work, in situ synchrotron X-ray diffraction in different integration directions is performed to quantify the contributions of electric field-induced phase transition and non-180 degrees domain switching to electrostrain for NBT-based ergodic relaxor ferroelectrics under external electric field. The calculated total strain is 0.41%, in which 0.038% results from volume strain related to the electric field-induced phase transition, while 0.127% is due to induced ferroelastic domain structures. The rest 0.245% is attributed to lattice stretching. The volume change caused directly by phase transition has a very limited effect on electrostrain, while the indirect effect of phase transition on strain (the domain switching of the ferroelectric phase) has a relatively large effect on electrostrain. This innovative work offers theoretical insights for optimizing NBT-based relaxor ferroelectric materials for actuator applications, contributing to better control of electrostrain.

关键词： Ferroelectric materials

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High-Throughput Growth of Armored Perovskite Single Crystal Fibers for Pixelated Arrays

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SMALL 2024年第38期20卷 e2401624页

作者： Li, Cuicui Ye, Xin Jiang, Jinke Guo, Qing Zheng, Xiaoxin lin, Qinglian Ge, Chao Wang, shuwen Chen, Jiashuai Gao, Zeliang Zhang, Guodong Tao, Xutang Liu, Yang Shandong Univ State Key Lab Crystal Mat 27 Shanda Nanlu Jinan 250100 Peoples R China Chinese Acad Sci Suzhou Inst Nanotech & Nanobion Adv Mater Div Suzhou 215123 Peoples R China Beijing Univ Technol Inst Laser Engn Sch Phys & Optoelect Engn Beijing 100124 Peoples R China

The poor machinability of halide perovskite crystals severely hampered their practical applications. Here a high-throughput growth method is reported for armored perovskite single-crystal fibers (SCFs). The mold-embedded melt growth (MEG) method provides each SCF with a capillary quartz shell, thus guaranteeing their integrality when cutting and polishing. Hundreds of perovskite SCFs, exemplified by CsPbBr3, CsPbCl3, and CsPbBr2.5I0.5, with customized dimensions (inner diameters of 150-1000 mu m and length of several centimeters), are grown in one batch, with all the SCFs bearing homogeneity in shape, orientation, and optical/electronic properties. Versatile assembly protocols are proposed to directly integrate the SCFs into arrays. The assembled array detectors demonstrated low-level dark currents (< 1 nA) with negligible drift, low detection limit (< 44.84 nGy s(-1)), and high sensitivity (61147 mu C Gy(-1) cm(-2)). Moreover, the SCFs as isolated pixels are free of signal crosstalk while showing uniform X-ray photocurrents, which is in favor of high spatial resolution X-ray imaging. As both MEG and the assembly of SCFs involve none sophisticated processes limiting the scalable fabrication, the strategy is considered to meet the preconditions of high-throughput productions.

关键词： arrays high-throughput growth perovskite single-crystal fibers X-ray imaging

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A prediction-correction scheme for microchannel milling using femtosecond laser

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OPTICS AND LASERS IN ENGINEERING 2017年 91卷 115-123页

作者： Chen, Jianxiong Zhou, Xiaolong lin, shuwen Tu, Yiliu Fuzhou Univ Sch Mech Engn & Automat Fuzhou Fujian Peoples R China Zhejiang Univ Technol Coll Comp Sci & Technol Hangzhou Zhejiang Peoples R China Univ Calgary Dept Mech & Mfg Engn Calgary AB Canada

In this paper, a prediction-correction scheme is proposed to online measure and regulate the milling depth of microchannel using an indicator of laser triggered plasma. Firstly, a prediction model, with respect to the laser fluence and feedrate, is established with several calibration tests using the least square fitting method. It is utilized to change the focal position of objective to track the depth evolution of newly generated surface. Meanwhile, a scanning path for every milling layer with an offset in Z-axis at the beginning and the end of the trajectory, is developed to drive the plasma brightness periodically changing. Then, the milling depth could be obtained when the brightness reaches to the maximum value. By doing so, an online measurement method is presented to estimate the milling depth using the trend of plasma brightness. Furthermore, a correction model is developed to iteratively adjust the feedrate with the online estimated depth. Therefore, the microchannel milling process could be monitored and controlled,in a closed-loop manner, in order to accurately regulate the milling depth. Finally, an online measurement and closed-loop microchannel milling is carried out on the self developed micro-machining center. The effectiveness and correctness of the proposed method are verified by comparing the estimated depth with the actually measured results.

关键词： Microchannel milling Laser triggered plasma Online measurement Prediction-correction scheme

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Ultrasensitive label-free miRNA-21 detection based on MXene-enhanced plasmonic lateral displacement measurement

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NANOPHOTONICS 2023年第21期12卷 4055-4062页

作者： Wang, Yuye Hu, Yurui Xie, Ruibin Zeng, Qi Hong, Yanhang Chen, Xi Zhang, Pengcheng Zeng, lin Zhang, Yi Zeng, shuwen Yang, Hui Chinese Acad Sci Shenzhen Inst Adv Technol Inst Biomed & Hlth Engn Bion Sensing & Intelligence Ctr Shenzhen 518055 Peoples R China Univ Technol Troyes Light Nanomat Nanotechnol L2n CNRS EMR 7004 F-10000 Troyes France

miRNAs are small non-coding RNA molecules which serve as promising biomarkers due to their important roles in the development and progression of various cancer types. The detection of miRNAs is of vital importance to the early-stage diagnostics and prognostics of multiple diseases. However, traditional detection strategies have faced some challenges owing to the intrinsic characteristics of miRNAs including small size, short sequence length, low concentration level and high sequence homology in complex real samples. To overcome these challenges, we proposed a MXene-enhanced plasmonic biosensor for real-time and label-free detection of miRNA. By utilizing MXene nanomaterial which possesses unique characteristics including large surface area and strong carrier confinement abilities, we tuned the absorption of our plasmonic sensing substrate to reach a "zero-reflection" state and induced an extremely sharp phase change at the resonance angle. Combined with the sensing mechanism based on phase-induced lateral displacement measurement, this MXene-enhanced plasmonic biosensor can achieve a much superior sensing performance compared to traditional SPR devices. Based on this biosensing scheme, the ultrasensitive detection of target miRNA with a detection limit down to 10 fM has been successfully demonstrated. More importantly, single-base mismatched miRNA can be easily distinguished from the target miRNA according to the sensing signal. Furthermore, our plasmonic biosensor is capable of detecting miRNA in complex media such as 100 % human serum samples without compromising the detection sensitivity. This MXene-enhanced plasmonic sensing scheme has the ability of detecting miRNAs with extremely low concentration levels in complex surrounding media without the need of introducing extra labels or amplification tags, which holds great potential in various biological applications and clinical diagnostics.

关键词： miRNA detection surface plasmon resonance MXene-enhanced biosensing phase singularity

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Optimization of bovine embryonic fibroblast feeder layer prepared by Mitomycin C

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CELL AND TISSUE BANKING 2023年第1期24卷 221-230页

作者： Zhao, Fang Yu, Jianning Ding, Qiang Chen, Kunlin Xia, shuwen Qian, Yong Gao, Yundong lin, Zhiping Wang, Huili Zhong, Jifeng Jiangsu Acad Agr Sci Inst Anim SciState Key Lab Cultivat Base Jiangsu Key Lab Food Qual & SafetyMinist Sci & T Key Lab Crop & Anim Integrated FarmingMinist Agr Nanjing 210014 Jiangsu Peoples R China Shandong Ox Livestock Breeding Co Ltd Jinan 250100 Shandong Peoples R China Jiangsu Youyuan Dairy Res Inst Nanjing 211100 Jiangsu Peoples R China

Feeder cells play important roles in In-vitro culture of stem cells. However, the preparation protocol of feeder cells produced by bovine embryonic fibroblast cells (bEFs) is still lack. In this study, the preparation of bEF-feeder by Mitomycin C was optimized with different concentrations and treatment time. The cell viability of bEFs was detected by CCK8 and 5-Ethynyl-2 '-deoxyuridine. The growth of bESCs in each bEFs-feeder group was assessed by alkaline phosphatase staining and CCK8. Quantitative real time PCR was used to detect the mRNA expression of pluripotency-related genes of bESCs. Results showed that the proliferation of bEFs was significantly repressed while bEFs were treated with 14 ug/mL or 16 ug/mL Mitomycin C for 3 h, and the cell viability within 2-4 days after treatment was consistent with the 1st day. The numbers of bESCs clones in bEF-feeder treated with 14 mu g/mL Mitomycin C for 3 h or 16 mu g/mL Mitomycin C for 3 h were significantly higher than that in bEF-feeder treated with 8 mu g/mL Mitomycin C for 8 h or bEFs treated with 6 mu g/mL Mitomycin C for 9 h. The mRNA expression of pluripotency-related genes in bESCs cultured by bEF-feeder were higher than the MEF-feeder, the clone morphology of bESCs cultured in bEF-feeder was rounder and sharper than the MEF-feeder. In conclusion, the bEF-feeder prepared with 14 mu g/mL Mitomycin C for 3 h or 16 mu g/mL Mitomycin C for 3 h could effectively maintains the growth of bESCs, and bEF-feeder is more suitable for bESCs culture than the MEF-feeder.

关键词： Bovine embryonic fibroblasts Mitomycin C Cell proliferation Feeder cells Bovine pluripotent stem cell

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数字媒体艺术中的虚拟性身体形象建构

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中国高校社会科学 2023年第4期 133-141,M0006页

作者：杨舒文包林北京服装学院北京100020 清华大学美术学院北京100084

信息化时代数字媒体科技的迅猛发展,一方面改变了公众的生活习惯与思维模式,另一方面也深化了个体对身体的认识,并拓宽了表现身体的艺术语言。在媒体科技的推动下,尤其在技术、媒介、空间、对象等多方配合下,身体形象于技术理性和艺术... 详细信息

信息化时代数字媒体科技的迅猛发展,一方面改变了公众的生活习惯与思维模式,另一方面也深化了个体对身体的认识,并拓宽了表现身体的艺术语言。在媒体科技的推动下,尤其在技术、媒介、空间、对象等多方配合下,身体形象于技术理性和艺术感性的虚实融合中展现出多元化的格局,在此过程中一种全新的虚拟性身体形象得以建构。

关键词：信息化时代媒体科技虚拟性身体形象艺术

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Unsupervised cluster analysis reveals distinct subgroups in healthy population with different exercise responses of cardiorespiratory fitness

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JOURNAL OF EXERCISE SCIENCE & FITNESS 2023年第1期21卷 147-156页

作者： Xie, lin Gou, Bo Bai, shuwen Yang, Dong Zhang, Zhe Di, Xiaohui Su, Chunwang Wang, Xiaoni Wang, Kun Zhang, Jianbao Xi An Jiao Tong Univ Dept Life Sci & Technol Key Lab Biomed Informat Engn Educ Minist Xian 710049 Peoples R China Xian Phys Educ Univ Dept Phys Act & Publ Hlth Xian 710068 Peoples R China Xi An Jiao Tong Univ Dept Life Sci & Technol Key Lab Biomed Informat Engn Educ Minist 28 Xianning West Rd Xian Peoples R China

Background: Considerable attention has been paid to interindividual differences in the cardiorespiratory fitness (CRF) response to exercise. However, the complex multifactorial nature of CRF response variability poses a significant challenge to our understanding of this issue. We aimed to explore whether unsupervised clustering can take advantage of large amounts of clinical data and identify latent subgroups with different CRF exercise responses within a healthy population. Methods: 252 healthy participants (99 men, 153 women;36.8 +/- 13.4 yr) completed moderate endurance training on 3 days/week for 4 months, with exercise intensity prescribed based on anaerobic threshold (AT). Detailed clinical measures, including resting vital signs, ECG, cardiorespiratory parameters, echocardiography, heart rate variability, spirometry and laboratory data, were obtained before and after the exercise intervention. Baseline phenotypic variables that were significantly correlated with CRF exercise response were identified and subjected to selection steps, leaving 10 minimally redundant variables, including age, BMI, maximal oxygen uptake (VO2max), maximal heart rate, VO2 at AT as a percentage of VO2max, minute ventilation at AT, interventricular septal thickness of end-systole, E velocity, root mean square of heart rate variability, and hematocrit. Agglomerative hierarchical clustering was performed on these variables to detect latent subgroups that may be associated with different CRF exercise responses. Results: Unsupervised clustering revealed two mutually exclusive groups with distinct baseline phenotypes and CRF exercise responses. The two groups differed markedly in baseline characteristics, initial fitness, echocardiographic measurements, laboratory values, and heart rate variability parameters. A significant improvement in CRF following the 16-week endurance training, expressed by the absolute change in VO2max, was observed only in one of the two groups (3.42 +/- 0.4 vs 0.5

关键词： Interindividual variability Oxygen uptake Training responsiveness Unsupervised learning

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High sensitivity and selectivity of h-BN/WO3 n-n heterojunction to triethylamine at low-temperature

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Chemosphere 2024年 366卷 143522页

作者： Zhu, shuwen Fan, Huiqing Lei, lin Fan, Yongbo Wang, Weijia State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnic University Xi'an710072 China Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Hong Kong 100872 Hong Kong

Due to the unique properties of heterojunction interfaces, heterojunction materials have broad application prospects in gas sensors. In this work, a facile and economical two-step synthesis method was employed to fabricate h-BN/WO3 heterojunctions, exhibiting excellent performance in triethylamine (TEA) detection. The results indicate that compared to pure WO3 sensors, h-BN/WO3 sensors exhibit superior TEA sensing capabilities, with an excellent response of 281.45 to 20 ppm TEA at 100 °C, which is 3.4 times higher. Moreover, h-BN/WO3 sensors demonstrate favorable response times, low detection limits, and good stability. These significant enhancements are attributed to the increase in oxygen vacancies and the establishment of heterojunctions between h-BN and WO3. Heterojunctions can regulate the concentration and transport rate of charge carriers, as well as the interface potential barrier, thereby affecting the gas sensing processes. This work may promote the further development of sensing materials and the practical application of WO3 sensors in TEA detection. © 2024 Elsevier Ltd

关键词： III-V semiconductors

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Performance and mechanisms of biochar-assisted vermicomposting in accelerating di-(2-ethylhexyl) phthalate biodegradation in farmland soil

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JOURNAL OF HAZARDOUS MATERIALS 2023年第PT B期443卷 130330页

作者： Zhen, Zhen Luo, shuwen Chen, Yijie Li, Gaoyang Li, Huijun Wei, Ting Huang, Fengcheng Ren, Lei Liang, Yan-Qiu lin, Zhong Zhang, Dayi Guangdong Ocean Univ Coll Coastal Agr Sci Zhanjiang 524088 Peoples R China Guangdong Ocean Univ Fac Chem & Environm Sci Zhanjiang 524088 Peoples R China Guangdong Ocean Univ Shenzhen Res Inst Shenzhen 518108 Peoples R China Jilin Univ Coll New Energy & Environm Changchun 130021 Peoples R China Jilin Univ Key Lab Groundwater Resources & Environm Minist Educ Changchun 130021 Peoples R China

Biochar and earthworms can accelerate di-(2-ethylhexyl) phthalate (DEHP) degradation in soils. However, little is known regarding the effect of biochar-assisted vermicomposting on soil DEHP degradation and the underlying mechanisms. Therefore, the present study investigated DEHP degradation performance and bacterial community changes in farmland soils using earthworms, biochar, or their combination. Biochar-assisted vermicomposting significantly improved DEHP degradation through initial physical adsorption on biochar and subsequent rapid biodegradation in the soil, earthworm gut, and charosphere. Burkholderiaceae, Pseudomonadaceae, and Flavobacteriaceae were the potential DEHP degraders and were enriched in biochar-assisted vermicomposting. In particularly, Burkholderiaceae and Sphingomonadaceae were enriched in the earthworm gut and charosphere, possibly explaining the mechanism of accelerated DEHP degradation in biochar-assisted vermicomposting. Soil pH, soil organic matter, and humus (humic acid, fulvic acid, and humin) increased by earthworms or biochar enhanced DEHP degradation. These findings imply that biochar-assisted vermicomposting enhances DEHP removal not only through rapid physical sorption but also through the improvement of soil physicochemical characteristics and promotion of degraders in the soil, earthworm gut, and charosphere. Overall, biochar-assisted vermicomposting is a suitable method for the remediation of organic-contaminated farmland soils.

关键词： Soil Biochar Earthworm Microbial communities Di-(2-ethylhexyl) phthalate

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Semi-Hydrogenation of Alkynes by a Tandem Photoredox System Free of Noble Metal

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CCS Chemistry 2022年第8期4卷 2597-2603页

作者： Tao Yuan shuwen Huan Bingqing Ge Sen lin Meifang Zheng Xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116

The selective hydrogenation reactions play a key role in industrial manufacture of fine chemicals,which mainly rely on noble metal ***,a noble-metal-free hybrid photosystem is established,in which boron carbonitride(BCN)and nickel bis-diphosphine complex(NiP)catalyze cooperatively the semi-hydrogenation of alkynes with high efficiency and excellent selectivity(>99%)under mild reaction conditions.

关键词： boron carbonitride nickel bis-diphosphine complex photocatalysis selective hydrogenation alkyne

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