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作者： kaela sarai mwango 华北电力大学(北京)

学位级别：硕士

在过去的几十年里,随着微纳尺度加工技术的进步,微型电子设备吸引了研究人员的广泛关注。然而,散热一直都是阻碍热沉性能进一步提高所面临的主要问题。因此,许多研究者们投入强化对流换热的研究中,以此提高微通道热沉性能。为了改善流... 详细信息

在过去的几十年里,随着微纳尺度加工技术的进步,微型电子设备吸引了研究人员的广泛关注。然而,散热一直都是阻碍热沉性能进一步提高所面临的主要问题。因此,许多研究者们投入强化对流换热的研究中,以此提高微通道热沉性能。为了改善流体流动和换热,人们设计了各种形式的微通道结构,通过不同方面和不同角度,对双层微通道,带有固体鳍片的微通道,带有多孔鳍片的微通道,带有波浪形鳍片或多孔鳍片的微通道进行了设计研究。本文设计了多种单层微通道热沉,包括多孔肋、平行波状肋和对称波状肋。采用商业软件CFDANSYS系统地研究不同结构微通道热沉的流动和换热性能。在不同的进口速度下,本文研究了多孔肋对于不同结构的影响。此外,还研究了肋片不同的开孔宽度对微通道热沉性能的影响。研究表明,多孔肋渗透率的增加有利于改善通道流动和换热性能。在高泵功区域,相比于多孔肋,实心肋使得通道产生了更大的热阻。最终,多孔肋微通道获得比实心肋微通道更好的综合性能。在同泵功条件下,多孔肋微通道具有更好的热效率。随着高度集成和小型电子技术的发展,为防止设备过热,同时保持稳定可靠的工作性能,电子设备的热管理至关重要。因此,优化微通道热沉设计,改善其换热性能至关重要。

关键词：微通道热沉压降流体流动转热

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Lipid bound extended release buprenorphine(high and low doses)and sustained release buprenorphine effectively attenuate post-operative hypersensitivity in an incisional pain model in mice(Mus musculus)

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Animal Models and Experimental Medicine 2021年第2期4卷 129-137页

作者： kaela Navarro Katechan Jampachaisri Monika Huss Cholawat Pacharinsak Department of Comparative Medicine Stanford UniversityStanfordCAUSA Department of Mathematics Naresuan UniversityPhitsanulokThailand

Background:Extended-release buprenorphine(XR)is indicated for pain management in rodents,but little is known about its use in *** study aimed to investigate whether high dose XR effectively attenuates post-operative hypersensitivity better than low dose XR in a mouse model of incisional ***:Mice(n 44)were randomly assigned to 1 of 4 treatment groups:(a)saline(1 ml/kg SC,once);(b)sustained release buprenorphine(Bup-SR,1 mg/kg SC,once);(c)low dose extended-release buprenorphine(XR-lo,3.25 mg/kg SC,once);(d)high dose extended-release buprenorphine(XR-hi,6.5 mg/kg SC,once).On days􀆴1,0(4 hours),1,2,and 3,mechanical and thermal hypersensitivities were evaluated,and plasma buprenorphine concentrations were ***:Mechanical(days 0-2)and thermal(days 0-1)hypersensitivities were ob-served in the saline ***-SR,XR-lo,and XR-hi attenuated mechanical hyper-sensitivity on days 0,1,and *** of the treatment groups,except XR-Lo on day 0,attenuated thermal hypersensitivity on days 0 or *** buprenorphine concen-tration peaked at 4 hours(day 0)in all treatment groups and remained greater than 1 ng/mL on days *** abnormal clinical observations or gross pathologic findings were seen in any ***:The results indicate XR-hi did not effectively attenuate post-operative hypersensitivity better than *** both 3.25 and 6.5 mg/kg XR are recom-mended for attenuating post-operative hypersensitivity for at least up to 48 hours in mice.

关键词： analgesia analgesics buprenorphine mouse pain management

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Free bisphenol A(BPA),BPA-Glucuronide(BPA-G),and total BPA concentrations in maternal serum and urine during pregnancy and umbilical cord blood at delivery

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Emerging Contaminants 2019年第1期5卷 279-287页

作者： Warren G.Foster Cariton Kubwabo Ivana Kosarac Sandra Gregorovich Garima Aryal kaela Coleman Department of Obstetrics&Gynaecology McMaster UniversityHamiltonOntarioL8S 4K1Canada Environmental Health Science and Research Bureau Health CanadaOttawaOntarioK1A 0K9Canada Tobacco Control Directorate Health CanadaOttawaOntarioK1A 0K9Canada

While adult exposure to total bisphenol A(BPA)has been well documented,developmental exposure to BPA and fetal exposure to the bioactive form(free BPA)remains poorly ***,pregnant women(n?199)between 28 and 35 weeks of pregnancy were invited to participate in this *** serum free of hemolysis(n?189)and urine(n?112)were collected at third trimester and delivery along with umbilical cord blood(UCB)at *** BPA,BPA mono-glucuronide(BPA-G)and total BPA concentrations were measured using gas chromatography coupled with tandem mass *** concentrations of free BPA were quantifiable above the method detection limit(MDL?0.026 ng/mL)in approximately 34%of serum samples in the third trimester and 21%of samples at delivery whereas BPA-G and total BPA were quantified in 43 and 70%of third trimester and delivery samples,*** geometric mean of free BPA,BPA-G and total BPA concentrations in maternal serum during the third trimester and at delivery were 0.62 ng/L and

关键词： Bisphenol A Free BPA Conjugated BPA Pregnancy Exposure Fetal development Cord blood

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Assessment of Sunflower (Helianthus annuus L.) for Phytoremediation of Heavy Metal Polluted Mine Tailings—A Case Study of Nampundwe Mine Tailings Dam, Zambia

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Journal of Environmental Protection 2023年第7期14卷 481-492页

作者： Mususu Kosta Mpongo Kaonda kaela Chileshe Department of Metallurgical Engineering School of Mines University of Zambia Lusaka Zambia

Mining activities have led to a generation of large quantities of heavy metals laden wastes which are released into the environment in an unsustainable way causing the contamination of the ecosystems and posing a risk to human health. Most mining companies have not employed any rehabilitation or remediation program of the heavy metal laden waste. The aim of this study was to assess the potential of sunflower for phytoremediation of heavy metal polluted mine tailings. Phytoremediation is an emerging technology in the remediation of mine tailings that uses tolerant plant species to clean up contaminated sites. It uses plants with high biomass and sunflower has been identified as such. These plants can extract, transfer, sequester and stabilize a variety of metals through mechanisms such as phytoextraction, phytostabilization, phytoaccumulation and phytovolatilization. Pot experiments were conducted by growing sunflower (Helianthus annuus L.) in pyrite mine tailings and in agricultural soil as a control. The study showed that the concentration of Cu reduced from 40.76 mg/kg to 36.59 mg/kg, Zn reduced from 3.58 mg/kg to 3.49 mg/kg and Fe reduced from 23.70 mg/kg to 10 mg/kg respectively in the mine tailings after 6 weeks. Analysis of harvested sunflower (roots, stems, leaves) showed that sunflower could remove heavy metals from the tailings and the highest removal efficiency was 53.7% and the highest translocation factor was 0.25. It was concluded that sunflower has the potential to remediate contaminated mine tailings and that phytoremediation is a viable and efficient technology to treat soils contaminated with heavy metals.

关键词： Phytoremediation Translocation Factor Metal Removal Efficiency Helianthus annuus

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系统功能语言学的性质、特点及发展

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现代外语 2020年第5期43卷 601-611页

作者：黄国文张培佳华南农业大学外国语学院广东广州510640 香港理工大学

Halliday构建的系统功能语言学已有60年的历史,经历了从句法理论、系统功能理论到社会意义学和适用语言学的发展阶段。本文回顾了该理论的不同发展阶段,分析了其性质和特点。系统功能语言学由理论与应用两个部分构成,既是普通语言学,也... 详细信息

Halliday构建的系统功能语言学已有60年的历史,经历了从句法理论、系统功能理论到社会意义学和适用语言学的发展阶段。本文回顾了该理论的不同发展阶段,分析了其性质和特点。系统功能语言学由理论与应用两个部分构成,既是普通语言学,也是适用语言学。该理论模式重视整体性,强调语言的功能和语言与语境的关系,因而更是一个综合理论。从本质上讲,系统功能语言学是为解决与语言相关的各种问题而设计,是一个以解决问题为导向的理论。该理论中,语篇分析有着非常重要的位置,是理论构建的一个基本步骤。

关键词：系统功能语言学适用语言学问题导向理论

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