Preparation and Characterization of Phosphors for LED

LED(light-emittingdiode，发光二极管)照明的提倡不仅有利于社会和环境的可持续性发展，还可以带动相关产业，提升我国照明产业的竞争力。而开发具有良好发光特性的荧光粉是得到高亮度、高发光效率、高显色性白光LED的关键所在。目前国内外都在研究优化固相法生产工艺或开发新制备工艺，以解决荧光粉存在的主要问题——亮度和显色指数偏低。 本文对高温固相法制备稀土掺杂YAG（yttriumaluminumgarnet，Y3Al5O12，钇铝石榴石）荧光粉这种方法进行了深入研究：通过对YAG荧光粉的温度、时间、掺杂离子种类、掺杂方式等制备工艺的优化，确定了稀土掺杂荧光粉的制备条件；通过XRD...Green lighting style was put forward at the background of global warming and energy saving. White LED (light-emitting diode) is recognized as the green lighting product and will substitute the traditional bulbs. In present, the way employing an InGaN/GaN LED chip coated by YAG（yttrium aluminum garnet，Y3Al5O12）yellow phosphors is the main way to get w-LED. As a result, YAG yellow phosphor becomes c...学位：工学硕士院系专业：化学化工学院材料科学与工程系_材料物理与化学学号：1932005130194

Tb_3Al_5O_(12)∶Ce~(3+)发光粉的微波辅助合成和性能表征

采用微波辅助合成-高温热处理制备了铈掺杂铽铝石榴石(Tb3Al5O12∶Ce3+,简称TAG∶Ce)发光粉。用XRD、SEM、激发和发射光谱等对粉末的晶型、形貌以及发光性能进行了表征。结果表明,发光粉晶粒清晰、表面光滑,粒径在2μm以下。TAG∶Ce的激发光谱主激发峰在467nm,330nm左右存在次激发峰,375nm附近存在两个强度较弱的峰;发射光谱峰值波长为550nm,与传统固相法制备的TAG∶Ce基本一致。与传统高温固相反应法相比,此方法具有高效、节能、环保等优点。通过分析反应历程,证明了Tb2O3-Al2O3系统中Al离子的分扩散系数大于Tb离子的

Separation and Characterization of Bisphenol-A Epoxy Resin Paint

[中文文摘]介绍了双酚 A型环氧树脂涂料配方的剖析方法。通过 IR及 NMR等方法对纯化的环氧树脂进行了表征并与传统的化学滴定测环氧值方法比较 ,用 NMR法测定双酚 A型环氧树脂数均相对分子质量的方法 ,建立了数均相对分子质量与环氧值之间的关系。[英文文摘]A separation method for bisphenol A epoxy resin paint was reported, and epoxy resin was characterized by IR and NMR spectroscopy.In contrast to traditional chemical titration method of measuring epoxy value( E ), the number average relative molecular mass ( n) of bisphenol A epoxy resin was calculated in terms of integral intensity in NMR. The relation of E and n was also given

Synthesis and Biological Activity of Novel Bis-heterocyclic Compounds Containing 1H-Pyrazole and Thiazole

以苯肼、乙酰乙酸乙酯和氨基杂环为原料 ,合成了两类含双杂环的新型吡唑甲酰胺衍生物 ,其结构经元素分析、1HNMR ,MS及IR确证 .初步的生物活性测试结果表明 :部分化合物对水稻纹枯病菌、小麦赤霉病菌和苹果轮纹病菌具有良好的抑制效果 .In order to search for novel fungicides with high activity and low toxicity, a series of bis-heterocyclic compounds containing 1H-pyrazole and thiazole were designed and synthesized from phenyl hydrazine, ethyl acetoacetate and aromatic aminoheterolcycles. The structures of all new compounds were confirmed by elemental analysis, 1H NMR, IR and MS spectra. Preliminary bioassays indicated that some compounds showed fungicidal activity against Pellicularia sasakii, Gibberella zeave and Physalospora piricola.科技部国家“九五”重点科技攻关 (No .97 563 0 2 0 5)资助项

高分散度铜基甲醇合成催化剂的研究

高分散度铜基甲醇合成催化剂的研究李基涛高利珍张伟德陈明树（厦门大学化学系物理化学研究所361005）70年来甲醇合成催化剂被广泛关注，特别是60年代后期英国ICI公司发明低温低压铜基甲醇合成催化剂以来，人们对铜基甲醇合成催化剂的制备与表征进行了深入地...国家自然科学基金;固体表面物理化学国家重点实验室资

2,2′-Bipyridine and Malononitrile as Additives for Styrene Living Radical Polymerization

[中文文摘]研究了稳定自由基存在下苯乙烯的活性聚合。发现在 2 ,2′ 联吡啶的存在下 ,苯乙烯聚合的分子量控制效果提高 ,分子量可控 ,分子量分布较窄。在与丙二腈共同作用时 ,可在 4h内达到 85 %的转化率 ,分子量分布在 1 .5以下 ,分子量控制误差在 2 0 %以下。设计分子量在 1 0 ,0 0 0 90 ,0 0 0 ,实测分子量和理论分子量相近.[英文文摘]Living free radical polymerizations of styrene were studied using benzoyl peroxide as an initiator in the presence of TEMPO(2,2,6,6-tetramethylpiperidinyl-1-oxy). The effect of MN/bpy malononitrile/2,2′-bipyridine additives on the control of molecular weight is explored. It was found that styrene polymerization was distinctly accelerated by MN/bpy additives and the theoretic molecular weight tallie well with the experimental molecular weight. Using the additives in a 1∶1.2 molar mixture of BPO and TEMPO with molbpy∶mol TEMPO = 2∶1 , molMN ∶mol TEMPO = 2. 5 at 135 ℃, the conversion of the styrene polymerization reached 85 % , the polydispersitics is below 1.5 and the difference between the theoretic molecular weight and the experimental molecular weight was cont roled below 20 %.固体表面物理化学国家重点实验室基金资助项目 (1130

RBFD: a Robust Image Local Binary Feature Descriptor

针对传统浮点型特征描述子占用空间大、匹配速度慢的问题,提出一种基于梯度统计信息比较的局部二值特征描述子.通过对比特征点邻域梯度统计信息生成二值特征描述子,再利用多邻域和多分块策略提高描述子判别力,最后通过近似简化的AdA bOOST算法实现描述子降维.实验结果表明,与已有描述子相比,文中提出的描述子在实现快速生成的同时其鲁棒性更强.The traditional floating feature descriptors are in high memory load and slow in matching.To best address these problems, this paper proposed a novel binary feature descriptor based on gradient statistic information comparison.Firstly, the image patch around the keypoint is divided into sub-regions, and our binary descriptor is constructed by comparing the gradient statistic information of these sub-regions.Then, a multi-gridding and multi-support region strategy is applied to boost the discrimination of our descriptor.Finally, a simplified Ada Boost algorithm is applied to realize the descriptor dimension reduction.The experimental results show that our descriptor is both efficient in construction and robust to compare with the state-of-the-art methods.国家自然科学基金(61373076;61202143); 厦门大学中央高校项目(2013121026;2011121052); 厦门大学985平台建设费项目; 高等学校博士学科点专项科研基金(201101211120024); 福建省自然科学基金(2013J05100;2010J01345;2011J01367); 湖南省自然科学基金(12JJ2040); 湖南省教育厅科研项目(09A046); 厦门市科技重点项目(3502Z20123017); 深圳市战略性新兴产业发展专项基金(JCY

多样性人源天然噬菌体抗体库的构建及初步应用

目的:构建多样性良好的人源天然噬菌体抗体库。方法:从正常人外周血中分离淋巴细胞,以RT-PCR和半巢式PCR扩增重链可变区VH基因和轻链可变区VL基因,以重叠延伸PCR将VH、VL组装成scFv基因,并将其克隆入噬菌粒载体pCANTAB-5E中。以pCANTAB-5E电转化大肠杆菌TG1,构建人源天然噬菌体抗体库,测序分析抗体基因的家族信息和多样性,并用多种抗原对其进行筛选。结果:获得了库容为2×108的人源天然噬菌体抗体库。分别用5种抗原对其进行筛选,均可获得特异性噬菌体抗体的富集。结论:成功地构建了一个多样性良好的人源天然噬菌体抗体库,可用于制备具有应用前景的人源抗体

亲和层析法用于噬菌体抗体库的筛选

本研究报道一种基于固定化金属亲和层析(IMAC)的噬菌体抗体库液相筛选方法。将纯化的带有His标签的抗原与噬菌体抗体库混合,噬菌体抗体与抗原充分结合后再加入亲和介质,使噬菌体抗体抗原复合物通过His标签与介质结合,然后通过充分洗涤去除非特异性噬菌体抗体,最后将特异性噬菌体抗体洗脱下来,感染TG1,进行下一轮筛选。整个筛选过程中抗原与抗体的结合在液相中完成,不仅消除了固相介质对抗原表位的影响,也更有利于噬菌体抗体与抗原的充分作用。将此方法应用于HEV NE2蛋白特异性人源噬菌体抗体的筛选,抗原竞争ELISA,阳性血清阻断,可溶性单链抗体表达检测及测序结果表明,最终获得2个特异性人源抗体

Synthesis and biological activity of novel bis-heterocyclic compounds containing 1H-pyrazole and thiazole

In order to search for novel fungicides with high activity and low toxicity, a series of bis-heterocyclic compounds containing 1H-pyrazole and thiazole were designed and synthesized from phenyl hydrazine, ethyl acetoacetate and aromatic aminoheterolcycles. The structures of all new compounds were confirmed by elemental analysis, H-1 NMR, IR and MS spectra. Preliminary bioassays indicated that some compounds showed fungicidal activity against Pellicularia sasakii, Gibberella zeave and Physalospora piricola