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A facile method for preparation of uniformly decorated-spherical SnO2 by CuO nanoparticles for highly responsive toluene detection at high temperature

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Journal of Materials Science & Technology 2020年第16期47卷 119-129页

作者： Angga Hermawan Yusuke Asakura Miki Inada shu yin Institute of Multidisciplinary Research for Advanced Materials(IMRAM) Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi980-857乙Japan Center of Advanced Instrumental Analysis Kyushu University6-1 Kasuga-Koen Kasuga-ShiFukuoka816-8580Japan

We reported a facile preparation of a uniform decoration of spherical n-type SnO2 by p-type CuO nanopa rticles as well as their utilization for enhanced performance on toluene gas *** nanoparticles and spherical SnO2 were synthesized by a facile non-hydrolytic solvothermal reaction,which could easily control their morphology.A uniform CuO nanoparticles decoration onto spherical SnO2 was achieved by a simple sonication and vigorous stirring at room tempe *** revealed orga nic solvents used in the oxide synthesis had a considerable influence on its surface charge that was beneficial for a uniformly electrostatic self-decoration between positively charged p-type CuO nanoparticles and negatively charged n-type spherical ***,CuO was partially reduced to Cu metal during high concentration of toluene exposure destroying p-n contact and developing new metal-semiconductor contact so-called ohmic junction,resulting in extraordinarily responsive and selective to toluene gas at 400℃as compared to a single p-CuO and *** was also found that the amount of particle decoration had an influence on sensor response and *** optimum amount of CuO nanoparticle decoration was0.1 mmol on 0.5 mmol *** re s ponse(S=Ra/Rg)and selectivity of CuO/S nO2 based material toward the exposure of 75 ppm toluene had reached to such high as 540 and 5,*** effect of p-n heterojunction and metal-semiconductor contact on the gas sensing mechanism of p-type CuO/n-type SnO2 was ***,by decorating with CuO nanoparticles,CuO/SnO2 morphology was well-maintained after gas sensing evaluation demonstrated its excellency for high temperature toluene gas sensor application.

关键词： CuO SnO2 p-n heterojunction Toluene gas sensor

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2023年糖尿病相关重要临床研究及实践进展

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中国实用内科杂志 2024年第5期44卷 415-418页

作者：胡雨晨冯秋尹淑芬张雨薇四川大学华西医院内分泌代谢科糖尿病与代谢研究中心四川成都610041 成都市第五人民医院内分泌科四川成都611130

糖尿病的患病率在全球范围内呈上升趋势。据报道,2021年全球有5.29亿糖尿病患者,预计到2050年,有超过13.1亿人患有糖尿病,其中约96.0%为2型糖尿病(T2DM)[1]。因此有效的预防和控制糖尿病仍然是一个持续而巨大的挑战。本文将从重要指南... 详细信息

糖尿病的患病率在全球范围内呈上升趋势。据报道,2021年全球有5.29亿糖尿病患者,预计到2050年,有超过13.1亿人患有糖尿病,其中约96.0%为2型糖尿病(T2DM)[1]。因此有效的预防和控制糖尿病仍然是一个持续而巨大的挑战。本文将从重要指南与共识、重要临床研究、治疗更新3个方面对2023年糖尿病相关研究进展进行回顾,旨在为广大医务工作者以及研究人员在糖尿病领域未来的研究方向上提供一定的参考,同时也为相关临床决策提供一定指导性建议。

关键词：糖尿病指南共识降糖药物

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Preface to the special issue: Novel functionalities of tungsten-related materials

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Tungsten 2019年第4期1卷 245-246页

作者： shu yin Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan

Tungsten is one of the most important strategic resources of rare metallic *** journal focuses on the tungsten and related elements,including molybdenum,cobalt,vanadium,tantalum,niobium,rhenium,together with their *** tungsten-based materials have already shown a wide range of applications such as filaments of a bulb,high hardness alloys,bullets for the anti-tank and ***,many researchers have also paid their attentions to the new functionality and novel applications of tungsten-based materials.

关键词： tungsten journal molybdenum

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微藻资源概述及微藻多糖的生物活性研究进展

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中国食物与营养 2024年第9期30卷 58-66页

作者：杨正磊冯鑫尹淑涛四川成都中农大现代农业产业研究院成都611430 中国农业大学食品科学与营养工程学院北京100083 成都市华测检测技术有限公司成都6100041

目的:微藻种类多样、生长迅速且富含营养成分,是资源丰富、开发前景广阔的一种新食品原料。微藻中多糖含量丰富,且微藻多糖具有多种有益的生物活性,在食品、化妆品、医药等领域大有作为,因此了解微藻资源并梳理微藻多糖的生物活性具有... 详细信息

目的:微藻种类多样、生长迅速且富含营养成分,是资源丰富、开发前景广阔的一种新食品原料。微藻中多糖含量丰富,且微藻多糖具有多种有益的生物活性,在食品、化妆品、医药等领域大有作为,因此了解微藻资源并梳理微藻多糖的生物活性具有重要意义。方法:利用中国知网(CNKI)、万方数据、ScienceDirect数据库对微藻资源概况和微藻多糖的生物活性进行检索。结果:对微藻的分类、培养方式、营养组成进行了简要介绍,并概述了微藻多糖的分离纯化方法、结构、主要生物活性和应用现状,为微藻新食品原料的开发以及微藻多糖的深入广泛应用提供参考。结论:微藻复杂成分和精细结构的研究有待深入,微藻多糖应用的深度和广度仍需进一步探索。

关键词：微藻营养多糖生物活性

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Non-Contact Physiological Measurement System for Wearing Masks During the Epidemic

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Computers, Materials & Continua 2023年第5期75卷 2509-2526页

作者： shu-yin Chiang Dong-Ye Wu Department of Information and Telecommunications Engineering Ming Chuan UniversityNo.5 De Ming Rd.Gui Shan DistrictTaoyuan City333Taiwan

Physiological signals indicate a person’s physical and mental state at any given ***,many studies extract physiological signals from the human body with non-contact methods,and most of them require facial feature ***,under COVID-19,wearing a mask has become a must in many places,so how non-contact physiological information measurements can still be performed correctly even when a mask covers the facial information has become a focus of *** this study,RGB and thermal infrared cameras were used to execute non-contact physiological information measurement systems for heart rate,blood pressure,respiratory rate,and forehead temperature for peoplewearing masks due to the *** the green(G)minus red(R)signal in the RGB image,the region of interest(ROI)is established in the forehead and nose bridge *** photoplethysmography(PPG)waveforms of the two regions are obtained after the acquired PPG signal is subjected to the optical flow method,baseline drift calibration,normalization,and bandpass *** relevant parameters in Deep Neural Networks(DNN)for the regression model can correctly predict the heartbeat and blood *** addition,the temperature change in the ROI of the mask after thermal image processing and filtering can be used to correctly determine the number of ***,the thermal image can be used to read the temperature average of the ROI of the forehead,and the forehead temperature can be obtained *** experimental results show that the above-mentioned physiological signals of a subject can be obtained in 6-s images with the error for both heart rate and blood pressure within 2%∼3%and the error of forehead temperature within±0.5°C.

关键词： PPG DNN heart rate blood pressure prediction face mask

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THEORY AND METHOD FOR WETLAND BOUNDARY DELINEATION

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Chinese Geographical Science 2006年第1期16卷 56-62页

作者： yin shu-bai LU Xian-guo Northeast Institute of Geography and Agroeeology Chinese Aeademy of Seiences Changchun 130012 P. R. China Graduate School of Chinese Academy of Sciences Beijing 100049 P. R. China

Based on the analysis of the subjectivity of wetland boundary criteria and their causes at present, this paper suggested that, under the condition that the mechanism of wetland formation process has not been understood, "black box" method of System Theory can be used to delineate wetland boundaries scientifically. After analyzing the difference of system construction among aquatic habitats, wetlands and uplands, the lower limit of rooted plants was chosen as the lower boundary criterion of wetlands. Because soil diagnostic horizon is the result of the long-term interaction among all environments, and it is less responsive than vegetation to short-term change, soil diagnostic horizon was chosen as the indicator to delineate wetland upper boundary, which lies at the thinning-out point of soil diagnostic horizon. Case study indicated that it was feasible using the lower limit of rooted plants and the thinning-out point of soil diagnostic horizon as criteria to delineate the lower and upper boundaries of wetland. In the study area, the thinning-out line of albic horizon was coincident with the 55.74m contour line, the maximum horizon error was less than 1m, and the maximum vertical error less than 0.04m. The problem on wetland definition always arises on the boundaries. Having delineated wetland boundaries, wetlands can be defined as follows: wetlands are the transitional zones between uplands and deepwater habitats, they are a kind of azonal complex that are inundated or saturated by surface or ground water, with the lower boundary lying at the lower limit of rooted plants, and the upper boundary at the thinning-out line of upland soil diagnostic horizon.

关键词： wetland boundary "black box" method soil diagnostic horizon thinning-out point (line) wetland definition

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间接兴趣视角下线上教学有效性实践探索

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当代教研论丛 2024年第3期10卷 25-28页

作者：姚莹殷舒淇杨渡山西师范大学现代文理学院转设筹备处山西临汾041000

文章旨在探索如何通过增强大学生的间接兴趣来提高线上教学效果。研究选取某高校两个班级,对其中某班学生进行课程改革,采用实验组控制组前测后测的实验设计和访谈法,课程学习情况运用SPSS25.0进行计算。研究结果表明:实验组控制组在前... 详细信息

文章旨在探索如何通过增强大学生的间接兴趣来提高线上教学效果。研究选取某高校两个班级,对其中某班学生进行课程改革,采用实验组控制组前测后测的实验设计和访谈法,课程学习情况运用SPSS25.0进行计算。研究结果表明:实验组控制组在前测成绩上并无显著差异,实验组控制组在后测成绩上有显著差异。因此,教师可以通过激发大学生认识到学习重要性的间接兴趣来提高线上教学效果。

关键词：间接兴趣线上教学实践探索

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“壮美广西”现代水网先导区建设思路与实施路径

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广西水利水电 2024年第1期 44-48页

作者：覃淑音蓝刚广西桂禹工程咨询有限公司南宁530023 广西水利发展集团有限公司南宁530023

本文分析了广西水网建设的优势与特色,阐述了“壮美广西”现代水网先导区的建设思路、目标任务和重点突破方向,提出防洪排涝网、城乡供水网、农业灌溉网、水生态修复网和水利智慧网“五网”共建的实施路径,全面提升区域水安全保障水平,... 详细信息

本文分析了广西水网建设的优势与特色,阐述了“壮美广西”现代水网先导区的建设思路、目标任务和重点突破方向,提出防洪排涝网、城乡供水网、农业灌溉网、水生态修复网和水利智慧网“五网”共建的实施路径,全面提升区域水安全保障水平,推动形成示范效应突显、可借鉴可推广的水网建设典型经验。

关键词：壮美广西水网建设目标任务实施路径

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A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo_(4)O_(7+δ) for thermochemical cycles

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Journal of Materials Science & Technology 2021年第9期68卷 8-15页

作者： Tingru Chen Yusuke Asakura Takuya Hasegawa Teruki Motohashi shu yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendaiMiyagi980-8577Japan Department of Materials and Life Chemistry Kanagawa UniversityYokohama221-8686Japan

In recent years,oxygen storage materials(OSMs)have been widely used in many *** would be particularly important for researchers to design high-oxygen-uptake/release-rate *** this study,various synthesis processes were used to successfully synthesize YBaCo_(4)O_(7+δ)and comprehensively investigate their potential *** red with traditional solid-state reaction method and co-precipitation method,the results demonstrated that the utilization of mechanical ball milling treatment on co-precipitated precursors could lead to samples with reversible oxygen uptake/release under an oxidative atmosphere at low *** resultant materials exhibited fast oxygen absorption/desorption rate that could uptake/release oxygen directly to the equilibrium state within 9 min and20 min,*** mechanochemically ball-milled sample possessed outstanding oxygen sto rage performance,which could be attributed to their small particle size,the active outer surface of particles,large specific surface area,and relatively low activation ***,the ball-milled sample also exhibited excellent cycling stability during relatively short time *** results also demonstrated that the ball-milled samples could reversibly uptake/release 2.90 wt.%of excess oxygen(while only 0.70 wt.%for solid-state samples)by adjusting the ambient temperature under pure O_(2) atmosphere,which would make them promising candidates in various *** research demonstrated that mechanical treatment could be an effective strategy to tune the properties and oxygen storage capacity(OSC)performances of YBaCo_(4)O_(7+δ).

关键词： Oxygen storage materials Mechanical treatment YBaCo_(4)O_(7) Thermochemical cycles

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Effect of Zr on undissolved phases and carbide precipitation in Ti microalloyed low-carbon steel

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Journal of Iron and Steel Research International 2019年第7期26卷 720-732页

作者： Peng-cheng Liu Jian-chun Cao shu-biao yin yin-hui Yang Peng Gao Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China

The undissolved phases and carbide precipitation in Ti and Ti-Zr microalloyed low-carbon steels were investigated by scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry. At 1225℃, the replacement of Ti by Zr formed Zr2CS and (Zr, Ti)N (the Ti/Zr atomic ratio is 0.11) and reduced the consumption of Ti. At 925℃, it was identified that TiC phases were precipitated at first and Zr was incorporated into the TiC lattice in the subsequent precipitation process, which promoted the precipitation of titanium carbide. The calculation of the interaction coefficient between Ti, C, N and Zr showed that Zr reduced the activity of Ti and C and increased the activity of N in the iron matrix. Therefore, with the addition of Zr, the solubility of Ti was increased, and the consumption of Ti was reduced at high temperature in Ti microalloyed low-carbon steel. The thermodynamic calculation of carbide precipitation transformation showed that the replacement of Ti by Zr increased the nucleation driving force and the nucleation rate of titanium carbide, while the critical core size and the critical nuclear energy were reduced. As the holding time was extended, the Zr/ Ti atomic ratio increased and the size of the precipitates also increased. When the Zr/Ti atomic ratio reached a certain level, the size of the precipitates did not increase with further increase in atomic ratio. When the Zr/Ti atomic ratio in (Ti, Zr)C was 0.05-0.17,(Ti, Zr)C was the most stable carbide and the easiest to nucleate at 925℃. There was more of the (Ti, Zr)C phase than TiC at 925 ℃ after 50 and 100 s, and the time to complete the coarsening behavior of (Ti, Zr)C was shorter than that of TiC.

关键词： Ti-Zr microalloyed steel Undissolved phase Carbide precipitation Zirconium Thermodynamics

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