Results 61 to 70 of about 162,194 (223)
"fordi før så skreiv æ Å-G". En studie om andreklassingers valg av stavemåter.
, 2023 The purpose of this master's thesis has been to look at the choices students in Year 2 make when spelling words. The students participating in this research are in the transition between phonological and orthographic writing, and the study will focus on how these students adopt different spelling strategies. The assignment's data material is taken from
openaire +1 more source
Multi-wavelength Emissions for Sgr A* and Low-Luminosity Active Galactic Nuclei [PDF]
, 2015 黑洞吸积一直是高能天体物理的一个重要过程。本文主要讨论了Sagittarius~A$^\star$(\sgra)的宁静态和耀发态，以及低光度活动星系核系统的多波段辐射，寄希望于对\sgra\的吸积和抛射过程，以及低光度活动星系核的中心引擎有一个统一深入的理解。本文可以主要分为以下四个部分： 在第二章，我们利用现有的法拉第旋转量（RM）观测讨论了\sgra\的喷流模型。在过去二十多年里，已经有多个理论模型被用来解释\sgra\的宁静态辐射。辐射低效吸积流和喷流模型是其中的两个竞争模型。利用对\sgra ...
李亚平
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Rare Metals, EarlyView.ABSTRACT Proton exchange membrane fuel cells (PEMFCs) require advanced bipolar plate coatings to enhance efficiency, durability, and commercialization potential. This review presents a systematic framework for evaluating and designing bipolar plate coatings, integrating material selection, performance metrics, deposition techniques, and future ...
Shijie Li +12 more
wiley +1 more source
[[alternative]]A Mixture Stochastic Frontier Model and Its Application on Economic Growth [PDF]
計畫編號：NSC93-2415-H032-011研究期間：200408~200507研究經費：298,000[[abstract]]本研究計畫提出一個新的混合型隨機邊界模型，用以估計經濟成長模型及其中蘊含的假 說。經濟成長模型的實証研究已是重要的主流文獻之一，但絕大多數的估計方法不外乎 一般線性的計量模型。Kumar and Russell (2002) 提出了一個新的觀點，把經濟成長的議 題視為邊界模型的一個應用。該文章乃以無母數的資料包絡法來對邊界模型進行分析。 本研究計畫將承接Kumar and ...
陳怡宜
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Studies of the PPDF Chemical Reaction Rate Model for the Numerical Simulation of Nitrogen Oxides [PDF]
, 2016 本文在目前应用广泛的湍流燃烧模拟方法PPDF，即预设概率密度函数的基础上，以混合分数和温度为变量，同时引入时间尺度的考虑，提出了一个NOx计算模型——PPDF化学反应速率模型。在该模型的理论基础上，使用CHEMKIN软件的SENKIN模块，以详细的化学反应机理计算NO的生成速率，并将计算结果拟合建立成数据库。 使用该模型在STAR-CD中计算了三组湍流非预混射流火焰：H2、H2/CO/N2和CH4/H2/N2射流火焰，并与Sandia实验室公布的实验数据进行比较 ...
封颖
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Rare Metals, EarlyView.ABSTRACT Skin wound injuries are often accompanied by bacterial infections and severe inflammation. Especially, M1‐type macrophages at the wound site can trigger a cascade of inflammatory responses, mediating a vicious cycle of inflammation. Meanwhile, hypoxia further exacerbates vascular damage and constriction in the wound microenvironment, thereby ...
Xianfeng Wang +6 more
wiley +1 more source
Ｒetrieval of Secchi disk depth using MODIS satellite remote sensing and in situobservations in the Yellow Sea and the East China Sea [PDF]
, 2016 海水透明度是描述水体光学特征的一个重要参数,也是海洋水质调查中的一个重要指标。利用2个航次的黄东海透明度数据和MODIS遥感反射率数据,进行了黄东海透明度的遥感反演研究,建立了透明度单波段模型、波段比值模型、三波段模型以及基于固有光学特性的半分析模型。结果表明,三波段模型具有较高精度,反演值与实测值之间的平均相对误差为19%、决定系数为0.719、均方根误差为1.47 m。黄东海透明度估测模型的建立,有利于利用遥感影像对黄东海透明度进行全面估测 ...
周斌 +5 more
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Rare Metals, EarlyView.ABSTRACT Precise control of chemical ordering in bimetallic nanocatalysts offers a route to decouple activity and selectivity in acetylene hydrogenation, but direct atomic‐scale evidence linking surface order to catalytic performance is scarce. Here, we tune Pd‐Cu nanoalloys from chemically disordered to highly ordered states by composition control and
Fan Xue +5 more
wiley +1 more source
The establishment of new organ transplant models for immune rejection and the exploration of the mechanisms of transplantation immunity [PDF]
, 2015 目的：建立两种新型的器官移植排斥反应模型，即树鼩异种心脏移植模型以及使用套管法建立新型小鼠主动脉移植模型，并分别对这两种器官移植模型中的异种移植免疫排斥机制和慢性排斥反应机制进行初步探索。 方法：1.采用腹部异位心脏移植的方法建立树鼩到SD大鼠，SD大鼠到树鼩的异种心脏移植模型，对比树鼩与大鼠的解剖数据，分析模型的可行性，观察移植心脏的生存期及病理变化，观察模型的免疫排斥反应类型，进行免疫组化、微量淋巴毒实验、混合淋巴实验以进行机制的初步探讨。2.利用套管法将供体BALB ...
伍源
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Rare Metals, EarlyView.ABSTRACT Against the backdrop of global clean energy transition and surging demand for lithium resources, lithium extraction from salt lakes presents unprecedented development opportunities. Nanofiltration (NF) membrane technology, recognized for its efficiency, energy savings, and environmental benefits, demonstrates significant application potential ...
Wen‐Feng Li +5 more
wiley +1 more source