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Optically sizing single atmospheric particulates with a 10-nm resolution using a strong evanescent field

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Light(Science & Applications) 2018年第1期7卷 1087-1093页

作者： Xiao-Chong Yu yanyan zhi Shui-Jing Tang Bei-Bei Li Qihuang Gong Cheng-Wei Qiu Yun-Feng Xiao State Key Laboratory for Mesoscopic Physics and School of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore NUS Suzhou Research Institute(NUSRI) Suzhou 215123China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology Shenzhen UniversityShenzhen 518060China

Although an accurate evaluation of the distribution of ultrafine particulate matter in air is of utmost significance to public health,the usually used PM2.5 index fails to provide size distribution information.Here we demonstrate a low-profile and cavity-free size spectrometer for probing fine and ultrafine particulate matter by using the enhanced particle-perturbed scattering in strong optical evanescent fields of a nanofiber array.The unprecedented size resolution reaches 10 nm for detecting single 100-nm-diameter nanoparticles by employing uniform nanofibers and controlling the polarizations of the probe light.This size spectrometry was tested and used to retrieve the size distribution of particulate matter in the air of Beijing,yielding mass concentrations of nanoparticles,as a secondary exercise,consistent with the officially released data.This nanofiber-array probe shows potential for the full monitoring of air pollution and for studying early-stage haze evolution and can be further extended to explore nanoparticle interactions.

关键词： air pollution optical nanofiber single particulates size spectrometer

Surveying on English Mobile Learning Among University Students: Current State and Influencing Factors

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Sino-US English Teaching 2024年第3期21卷 108-119页

作者： ZHU Haihua CHEN Yifan REN yanyan zhi Yuying University of Shanghai for Science and Technology ShanghaiChina

Mobile learning integrates mobile technology with digital learning,offering flexible,personalized content and portable equipment.It enables access to rich content and enhances learning efficiency.Therefore,it has become mainstream to utilize mobile devices for English learning among university students’English learning.The current study aims to examine the current situation and influencing factors of university students’English mobile learning.98 university students in one university of Shanghai participated the study and the questionnaire was used to collect the data.The results indicated that most university students already have electronic devices to support mobile learning.Personal factors,environmental factors,digital literacy,and technological capabilities are the main factors affecting university students’English mobile learning.The current study has implications for learners,teachers,and software developers.Learners should adjust their learning motivation,play an active role,and fully utilize the mobile platform to obtain resources and improve learning efficiency.Teachers should incorporate the advantages of mobile teaching and promote categorized and tiered teaching.Software developers should add new functions on the basis of meeting the basic needs of learners and continuously innovate the mobile learning platform.

关键词： English learning mobile learning university students

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维生素E-大豆蛋白微胶囊的制备及特性分析

中国油脂 2024年第5期49卷 60-65页

作者：殷琦郑志姜绍通赵妍嫣合肥工业大学食品与生物工程学院合肥230601 农产品现代加工安徽省重点实验室合肥230601

为生产包封效率高、稳定性好的维生素E微胶囊产品,以大豆分离蛋白/硫酸葡聚糖复合颗粒或大豆分离蛋白与麦芽糊精作为复合壁材,大豆油和维生素E为芯材,通过冷冻干燥法制备维生素E-大豆蛋白微胶囊,通过对微胶囊包封效率、粒径、傅里叶红... 详细信息

为生产包封效率高、稳定性好的维生素E微胶囊产品,以大豆分离蛋白/硫酸葡聚糖复合颗粒或大豆分离蛋白与麦芽糊精作为复合壁材,大豆油和维生素E为芯材,通过冷冻干燥法制备维生素E-大豆蛋白微胶囊,通过对微胶囊包封效率、粒径、傅里叶红外光谱(FT-IR)、水分含量、润湿性、溶解度、吸湿性、堆积密度、振实密度、流动性、内聚性等理化性质的探究,考察壁材组成对微胶囊特性的影响。结果表明:壁材组成对微胶囊的理化性质具有显著影响;微胶囊最佳壁材组成为大豆分离蛋白/硫酸葡聚糖复合颗粒含量4 g/100 mL(以乳液体积计)和麦芽糊精含量12 g/100 mL(以乳液体积计),在此条件下微胶囊的包封效率为89.31%,粒径为1.39μm,且颗粒较为均一,水分含量较低,润湿性较低,溶解度较高,吸湿性较小,流动性较差,内聚性较强。综上,以大豆分离蛋白/硫酸葡聚糖复合颗粒和麦芽糊精作为复合壁材制备的维生素E-大豆蛋白微胶囊包封效率高,粉末特性好。

关键词：大豆分离蛋白硫酸葡聚糖复合壁材维生素E 微胶囊

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Ni单原子负载氮掺杂多孔碳促进锂硫电池中的多硫化物转化

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Science China Materials 2024年第6期67卷 1938-1946页

作者：陈乐园孙焱焱常智柴思敏何琼潘安强 School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Xinjiang UniversityUrumqi 830046China

由分散在氮掺杂碳载体上的原子级金属位点组成的单原子催化剂(M SAC@NC)因其具有最大的原子利用率、独特的物理化学性质和优异的催化活性,已成为Li-S电池中的高性能电催化材料.本文采用物理吸附和热解相结合的方法,成功制备了一系列具... 详细信息

由分散在氮掺杂碳载体上的原子级金属位点组成的单原子催化剂(M SAC@NC)因其具有最大的原子利用率、独特的物理化学性质和优异的催化活性,已成为Li-S电池中的高性能电催化材料.本文采用物理吸附和热解相结合的方法,成功制备了一系列具有相似结构和理化性质的M SAC@NC(M=Ni,Co,Fe).双球差校正高角环形暗场扫描透射电子显微镜和X射线吸收光谱表明成功形成了单原子金属位点.此外,对硫氧化还原反应的催化活性趋势为Ni SAC@NC>Co SAC@NC>Fe SAC@NC,其中Ni SAC@NC在0.5C下表现出1280.6mAh g^(-1)的最高容量,循环800次后,平均每圈容量衰减率仅为0.07%,具有优异的电池性能.

关键词： single-atomic catalyst electrocatalysis Li-S battery

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计算机实验技术平台构建中虚拟化技术的运用分析

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电子测试 2019年第8期30卷 117-118页

作者：智岩岩驻马店职业技术学院信息工程系河南驻马店463001

为进一步满足计算机教学需求,提出利用虚拟化技术建设计算机实验技术平台的建议。文章首先阐述虚拟化技术的内涵,其次分条探究传统计算机实验室管理中存在的不足,以阐明建设计算机实验技术平台的必要性,最后对该平台构建策略进行较详细... 详细信息

为进一步满足计算机教学需求,提出利用虚拟化技术建设计算机实验技术平台的建议。文章首先阐述虚拟化技术的内涵,其次分条探究传统计算机实验室管理中存在的不足,以阐明建设计算机实验技术平台的必要性,最后对该平台构建策略进行较详细探究。希望虚拟化技术的应用,能协助高校培养出更多创新型技术人才。

关键词：虚拟化技术计算机实验室技术平台构建策略

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外源氨基酸添加对春卷皮面浆体系的影响

现代食品科技 2024年第4期40卷 186-195页

作者：马汝悦钟昔阳王佳林孙梦瑾罗水忠赵妍嫣郑志合肥工业大学食品与生物工程学院安徽合肥230009 安徽省农产品精深加工重点实验室安徽合肥230009

氨基酸作为良好的营养、风味增强剂,其在春卷皮面浆体系的研究鲜有报道,该研究选取四类八种氨基酸[碱性氨基酸:精氨酸(Arginine,Arg),赖氨酸(Lysine,Lys);酸性氨基酸:谷氨酸(Glutamic Acid,Glu)、天冬氨酸(Aspartic Acid,Asp);中性氨基... 详细信息

氨基酸作为良好的营养、风味增强剂,其在春卷皮面浆体系的研究鲜有报道,该研究选取四类八种氨基酸[碱性氨基酸:精氨酸(Arginine,Arg),赖氨酸(Lysine,Lys);酸性氨基酸:谷氨酸(Glutamic Acid,Glu)、天冬氨酸(Aspartic Acid,Asp);中性氨基酸:苏氨酸(Threonine,Thr)、甘氨酸(Glycine,Gly);非极性氨基酸:色氨酸(Tryptophan,Trp)、蛋氨酸(Methionine,Met)]来探究其对制备春卷皮面浆体系流变学与热力学特性、微观结构以及面筋蛋白二级结构的影响。发现碱性和酸性氨基酸的添加增加了面浆粘度,降低了面浆析水率,致使体系中游离水含量减少,面筋蛋白网络结构强度增加,进而面浆体系连接更紧密;其中,碱性氨基酸中的Arg降低了面浆中淀粉糊化所需能量焓值(1.68至1.24 J/g);此外,加入酸性氨基酸后,面浆淀粉糊化所需能量增大,面筋蛋白二级结构中β-折叠含量减少、α-螺旋和无规卷曲含量增加。中性和非极性氨基酸的加入降低了面浆粘度,提高了面浆析水率,对面浆体系热力学特性影响较小,同时增加了面筋蛋白二级结构中β-折叠和β-转角的含量。该研究以期为氨基酸在面制品中的应用提供相关理论基础。

关键词：面浆外源氨基酸热力学特性面筋蛋白结构微观结构

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明清章回小说文字副文本由释到评点的演化

古代文学理论研究

古代文学理论研究 2024年第1期 311-329页

作者：贾艳艳南通大学文学院

明清章回小说文字副文本经历了数次演化，先由“释”,再到“评林”,最后才是今天所见的“评点”样态。“释”发生在万历中后期，章回小说盛行伊始，这与小说史学题材和读者较薄弱的知识结构有关。在“释”盛行之时，福建书坊内部发生激... 详细信息

明清章回小说文字副文本经历了数次演化，先由“释”,再到“评林”,最后才是今天所见的“评点”样态。“释”发生在万历中后期，章回小说盛行伊始，这与小说史学题材和读者较薄弱的知识结构有关。在“释”盛行之时，福建书坊内部发生激烈竞争，余象斗书坊率先行动，在“释”基础上，推出具有批评性质的“评林”,将评置顶，提高了评在释中的占比，开启了小说评点。至万历后期，福建书坊衰落，三吴书坊崛起，伴随于此，杭州容与堂于万历三十八年(1610)推出李贽《水浒》评本，该评本凭借李贽的自我言说式评语和圈点符号的助力成为风尚，一直延续至明末。清初，随着明清易代，以李贽为代表的评点边缘化，取而代之的是有益文业的金圣叹评点，随后成为清代小说评点主流。

关键词：释评林评点技法

De novo creation of popcorn-like fragrant foxtail millet

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Journal of Integrative Plant Biology 2023年第11期65卷 2412-2415页

作者： yanyan Zhang Qiang He Shihui Zhang Xinyu Man Yi Sui Guanqing Jia Sha Tang Hui zhi Chuanyin Wu Xianmin Diao Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Zhongyuan Research Center Chinese Academy of Agricultural SciencesXinxiang 453000China

Aroma plays a crucial role in the sensory appeal and enjoyment of food,and it significantly impacts the grain quality of cereals,thereby influencing the value and consumption of agricultural products.For example,aromatic rice varieties like Basmati and Jasmine are renowned for their distinct aroma and command almost double the price of regular rice in the market.

关键词： cereal corn thereby

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In situ separator modification via CVD-derived N-doped carbon for highly reversible Zn metal anodes

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Nano Research 2022年第11期15卷 9785-9791页

作者： Xianzhong Yang Weiping Li Jiaze Lv Guojie Sun Zixiong Shi Yiwen Su Xueyu Lian yanyan Shao Aomiao zhi Xuezeng Tian Xuedong Bai Zhongfan Liu Jingyu Sun College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China Beijing Graphene Institute(BGI) Beijing 100095China Institute of Physics Chinese Academy of SciencesBeijing 100190China Center for Nanochemistry(CNC) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Attention toward aqueous zinc-ion battery has soared recently due to its operation safety and environmental benignity.Nonetheless,dendrite formation and side reactions occurred at the anode side greatly hinder its practical application.Herein,we adopt direct plasma-enhanced chemical vapor deposition strategy to in situ grow N-doped carbon(NC)over commercial glass fiber separator targeting a highly stabilized Zn anode.The strong zincophilicity of such a new separator would reduce the nucleation overpotential of Zn and enhance the Zn-ion transference number,thereby alleviating side reactions.Symmetric cells equipped with NC-modified separator harvest a stable cycling for more than 1,100 h under 1 mA·cm^(−2)/1 mAh·cm^(−2).With the assistance of NC,the depth of discharge of Zn anode reaches as high as 42.7%.When assembled into full cells,the zinc-ion battery based on NC-modified separator could maintain 79%of its initial capacity(251 mAh·g^(−1))at 5 A·g^(−1) after 1,000 cycles.

关键词： N-doped carbon glass fiber separator modification plasma-enhanced chemical vapor deposition(PECVD) Zn metal anode