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Capillary pumping independent of the liquid surface energy and viscosity

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Microsystems & Nanoengineering 2018年第1期4卷 423-429页

作者： weijin guo Jonas Hansson Wouter van der Wijngaart Micro and Nanosystems KTH Royal Institute of TechnologyOsquldas väg 10Stockholm 10044Sweden

Capillary pumping is an attractive means of liquid actuation because it is a passive mechanism,i.e.,it does not rely on an external energy supply during *** capillary flow rate generally depends on the liquid sample viscosity and surface *** poses a problem for capillary-driven systems that rely on a predictable flow rate and for which the sample viscosity or surface energy are not precisely ***,we introduce the capillary pumping of sample liquids with a flow rate that is constant in time and independent of the sample viscosity and sample surface *** features are enabled by a design in which a well-characterized pump liquid is capillarily imbibed into the downstream section of the pump and thereby pulls the unknown sample liquid into the upstream pump *** downstream pump geometry is designed to exert a Laplace pressure and fluidic resistance that are substantially larger than those exerted by the upstream pump geometry on the sample ***,the influence of the unknown sample liquid on the flow rate is *** experimentally tested pumps of the new design with a variety of sample liquids,including water,different samples of whole blood,different samples of urine,isopropanol,mineral oil,and *** capillary filling speeds of these liquids vary by more than a factor 1000 when imbibed to a standard constant cross-section glass *** our new pump design,20 filling tests involving these liquid samples with vastly different properties resulted in a constant volumetric flow rate in the range of 20.96–24.76μL/*** expect this novel capillary design to have immediate applications in lab-on-a-chip systems and diagnostic devices.

关键词： viscosity capillary pump

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高校音乐教育中开展多元文化音乐教育的价值

黑河学院学报 2015年第4期6卷 65-67页

作者：郭微谨福建幼儿师范高等专科学校福建福州350025

随着经济全球化的深入发展,带动文化也向多元化的方向不断发展。音乐作为文化的一部分,也不断向多元化的方向发展。多元文化音乐教育随之成为音乐教育界的主流发展趋势。我国各高校音乐教育中对多元文化音乐教育理念进行贯彻与落实的时... 详细信息

随着经济全球化的深入发展,带动文化也向多元化的方向不断发展。音乐作为文化的一部分,也不断向多元化的方向发展。多元文化音乐教育随之成为音乐教育界的主流发展趋势。我国各高校音乐教育中对多元文化音乐教育理念进行贯彻与落实的时间不是很长,经验不足,有些细节部分有待加强。首先对多元文化音乐教育的概念进行阐述,进而指出高校音乐教育中开展多元文化音乐教育的必要性,最后对高校音乐教育中开展多元文化音乐教育的价值进行了探讨,希望能够引起各高校对多元文化音乐教育的重视,从而培养出更多、更优秀的音乐人才。

关键词：高校音乐教育多元文化人才培养

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用于SAW器件制造的键合减薄技术

压电与声光 2013年第2期35卷 158-161页

作者：程进刘卫国刘欢郭伟进西安工业大学光电微系统研究所陕西西安710032

铌酸锂(LiNbO3)作为一种压电材料,常被用于声表面波(SAW)器件的压电层,通常LiNbO3晶片厚度为500μm,而实际上压电层的有效利用厚度为λ～2λ(λ为声表面波波长)。为能实现SAW器件的高度集成化,需用键合减薄及抛光技术对LiNbO3进行加工... 详细信息

铌酸锂(LiNbO3)作为一种压电材料,常被用于声表面波(SAW)器件的压电层,通常LiNbO3晶片厚度为500μm,而实际上压电层的有效利用厚度为λ～2λ(λ为声表面波波长)。为能实现SAW器件的高度集成化,需用键合减薄及抛光技术对LiNbO3进行加工处理。用粒径100nm的SiO2抛光液对减薄后的铌酸锂晶体样品进行化学机械抛光,研究了抛光垫、抛光盘转速、压力及抛光时间对抛光过程的影响。抛光结果表明最佳抛光工艺参数是:采用阻尼布抛光盘,100nm的SiO2抛光液,转速为120r/min,压力为3.9N,抛光时间为40min。经测试样品厚度为80μm,样品的最小粗糙度Ra=0.468nm,Rq=0.593nm(Ra为算术平均粗糙度,Rq为均方根粗糙度)。

关键词：铌酸锂(LiNbO3)晶片键合减薄声表面波(SAW)器件抛光

外侧楔形鞋垫对足踝生物力学影响的有限元分析

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医用生物力学 2024年第3期39卷 469-475页

作者：杜玮瑾陈维毅郭媛太原理工大学生物医学工程学院太原030024

目的探究外侧楔形鞋垫对足踝内部组织(包括足骨、关节和韧带)的生物力学影响。方法建立并验证足踝-鞋垫-地面三维有限元模型,探究步态3个关键瞬间赤足模型和鞋垫干预模型的足底压力分布、关节接触压力、跖骨及主要韧带的应力。结果 5... 详细信息

目的探究外侧楔形鞋垫对足踝内部组织(包括足骨、关节和韧带)的生物力学影响。方法建立并验证足踝-鞋垫-地面三维有限元模型,探究步态3个关键瞬间赤足模型和鞋垫干预模型的足底压力分布、关节接触压力、跖骨及主要韧带的应力。结果 5°外侧楔形鞋垫模型足底峰值压力比赤足模型减小65.8%。鞋垫干预使楔舟关节处峰值接触压力减小;距下关节处峰值接触压力和第4、5跖骨处峰值应力增大。结论本研究量化评估了外侧楔形鞋垫对足踝各部分的生物力学影响,提出了可适当减小外侧楔形鞋垫第4、5跖骨处倾斜角度的设计建议。

关键词：外侧楔形鞋垫足底压力分布关节接触压力有限元分析生物力学

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Study of the multi-physics field-coupled model of the two-stage electrostatic precipitator

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Building Simulation 2024年第3期17卷 387-398页

作者： Wenjia Hao Yu guo Yukun Wang Tao Yu Hao Gao Zhengwei Long Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityWeijin Road 92Tianjin300072China Wuhan Second Ship Design and Research Institute WuhanChin

The two-stage electrostatic precipitator is widely used to purify oil mist ***,there is limited research on the influences of relative humidity,particle deposition characteristics,and the generation of gaseous ***,this paper established a numerical model of the electrostatic oil mist purifier and applied it to a two-stage electrostatic *** the model was used to investigate the corona discharge characteristics under different relative humidity conditions in the charged zone,the particle deposition characteristics,the purification efficiency,the ozone concentration distribution,and the oil vapor concentration distribution in the collection *** results indicate that,with a constant temperature,the corona current decreases as relative humidity increase,and there is a quadratic relationship between relative humidity and *** variation in relative humidity has little impact on the purification *** maximum ozone concentration occurs near the electrode line,and its concentration is influenced by the discharge current and inlet airflow *** oil vapor concentration reaches its maximum value at the side plates,with a value of 19 ppb,while it reaches the minimum value at the collecting zone electrode plate,with a value of 2 *** temperature is the main factor affecting the volatilization of the oil film,with higher temperatures resulting in higher oil vapor.

关键词： two-stage ESPs particle deposition corona discharge oil vapor

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中国传统青色与绿色植物染服饰色彩辨析

毛纺科技 2024年第1期52卷 32-36页

作者：郭鹏丽徐伟津缪斌斌王越平北京服装学院材料设计与工程学院北京100029

青绿色系是中国传统服饰色彩中的重要组成部分,其中青色位于传统五正色首位。针对传统服饰色彩中青色与绿色的色彩边界模糊,常常统称为青绿色系的问题,文章首先测量故宫博物院官网上以青绿色命名的清代纺织品的色度值,其次采用传统单染... 详细信息

青绿色系是中国传统服饰色彩中的重要组成部分,其中青色位于传统五正色首位。针对传统服饰色彩中青色与绿色的色彩边界模糊,常常统称为青绿色系的问题,文章首先测量故宫博物院官网上以青绿色命名的清代纺织品的色度值,其次采用传统单染、复染以及与黄色系、红色系植物染料套染等染色技法,对染色后织物的色度值进行测量,比较图片数据与染色实验结果得出我国传统青、绿色系所表示的色度值范围。结果表明:绿色多指出现在第2、3象限的黄绿色,围绕在a轴负值上下,色度值大致范围为a^(*)值≤-10,b^(*)值为-10~50;青色色度值为a^(*)值在-10~10之间,b^(*)值在-70~10范围内,其中L^(*)值较小的一类色彩(-10≤a^(*)、b^(*)值≤10),如石青色、元青色、玄青色等,为狭义的青色。绿色与青色在第3象限有少量交叉。

关键词：植物染色青色系绿色系色相分析染色实验

Gut liver brain axis in diseases:the implications for therapeutic interventions

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Signal Transduction and Targeted Therapy 2024年第1期9卷 79-104页

作者： Mengyao Yan Shuli Man Benyue Sun Long Ma Lanping guo Luqi Huang Wenyuan Gao State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial MicrobiologyMinistry of EducationTianjin Key Laboratory of Industry MicrobiologyNational and Local United Engineering Lab of Metabolic Control Fermentation TechnologyChina International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal ChemistryCollege of BiotechnologyTianjin University of Science&Technology300457 TianjinChina National Resource Center for Chinese Materia Medica China Academy of Chinese Medical Sciences100700 BeijingChina Tianjin Key Laboratory for Modern Drug Delivery&High-Efficiency School of Pharmaceutical Science and TechnologyTianjin UniversityWeijin Road300072 TianjinChina

Gut-liver-brain axis is a three-way highway of information interaction system among the gastrointestinal tract,liver,and nervous *** the past few decades,breakthrough progress has been made in the gut liver brain axis,mainly through understanding its formation mechanism and increasing treatment *** this review,we discuss various complex networks including barrier permeability,gut hormones,gut microbial metabolites,vagus nerve,neurotransmitters,immunity,brain toxic metabolites,β-amyloid(Aβ)metabolism,and epigenetic regulation in the gut-liver-brain *** therapies containing antibiotics,probiotics,prebiotics,synbiotics,fecal microbiota transplantation(FMT),polyphenols,low FODMAP diet and nanotechnology application regulate the gut liver brain ***,some special treatments targeting gut-liver axis include farnesoid X receptor(FXR)agonists,takeda G protein-coupled receptor 5(TGR5)agonists,glucagon-like peptide-1(GLP-1)receptor antagonists and fibroblast growth factor 19(FGF19)*** gut-brain axis embraces cognitive behavioral therapy(CBT),antidepressants and tryptophan metabolism-related *** liver-brain axis contains epigenetic regulation and Aβmetabolism-related *** the future,a better understanding of gut-liver-brain axis interactions will promote the development of novel preventative strategies and the discovery of precise therapeutic targets in multiple diseases.

关键词： metabolism therapeutic immunity

Temporal and spatial changes in nutrients and chlorophyll-a in a shallow lake,Lake Chaohu, China: An 11-year investigation

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Journal of Environmental Sciences 2013年第6期25卷 1117-1123页

作者： Libiao Yang Kun Lei Wei Meng guo Fu weijin Yan River and Coastal Environment Research Center Chinese Research Academy of Environmental Sciences Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Temporal and spatial changes of total nitrogen （TN）, total phosphorus （TP） and chlorophyll-a （Chl-a） in a shallow lake, Lake Chaohu, China, were investigated using monthly monitoring data from 2001 through 2011. The results showed that the annual mean concentration ranges of TN, TP, and Chl-a were 0.08-14.60 mg/L, 0.02-1.08 mg/L, and 0.10-465.90 ~tg/L, respectively. Our data showed that Lake Chaohu was highly eutrophic and that water quality showed no substantial improvement during 2001 through 2011. The mean concentrations of TP, TN and Chl-a in the western lake were significantly higher than in the eastern lake, which indicates a spatial distribution of the three water parameters. The annual mean ratio of TN：TP by weight ranged from 10 to 20, indicating that phosphorus was the limiting nutrient in this lake. A similar seasonality variation for TP and Chl-a was observed. Riverine TP and NH4＋ loading from eight major tributaries were in the range of 1.56× 10^4-5.47 × 10^4 and 0.19 × 104-0.51 × 10^4 tons/yr over 2002-2011, respectively, and exceeded the water environmental capability of the two nutrients in the lake by a factor of 3-6. Thus reduction of nutrient loading in the sub-watershed and tributaries would be essential for the restoration of Lake Chaohu.

关键词： eutrophication Lake Chaohu nitrogen phosphorus

Research on Intelligent Mobile Commerce Transaction Security Mechanisms Based on Mobile Agent

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Computers, Materials & Continua 2020年第12期65卷 2543-2555页

作者： weijin Jiang Wei Liu Haolong Xia Yuhui Xu Dongbo Cao guo Liang College of Computer and Information Engineering Hunan University of Technology and BusinessChangsha410205China Institute of Big Data and Internet Innovation Mobile E-business Collaborative Innovation Center of Hunan ProvinceHunan University of Technology and BusinessChangsha410205China Key Laboratory of Hunan Province for New Retail Virtual Reality Technology Hunan University of Technology and BusinessChangsha410205China School of Bioinformatics University of MinnesotaTwin CitiesUSA

In networked mobile commerce network transactions,trust is the prerequisite and key to a smooth *** measurement of trust between entities involves factors such as transaction amount,transaction time,personal income of consumer entities and their risk attitude towards trust,etc.,so it is difficult to accurately calculate *** order to find out the essential characteristics of this trust relationship,based on the research background of mobile commerce in the mobile network environment,a dynamic trust mechanism is proposed through the research of trust in the mobile network environment,trust influencing factors and trust *** calculation model of mobile interactive services based on mobile service business *** model calculates feedback credibility through feedback deviation and feedback robustness,and combines transaction context factors and trust mapping mechanism to judge the seller’s *** model better reflects the degree of influence of subjective factors such as personal preferences and risk attitudes on trust calculations,And the sensitivity of trust algorithms and transaction attributes has been greatly *** a large number of experiments and theoretical analysis,this mechanism provides an effective explanation for solving the problem of network trust *** provides valuable new ideas for the study of secure transactions in the mobile Internet environment.

关键词： Mobile Internet mobile commerce dynamic trust model reputation management Mobile Agent System(MAS)