Study of Ce-doped YAG Phosphor Powder Prepared by Wet-chemical Method and Luminescent Properties

YAG：Ce荧光粉在白光LED领域具有广泛的应用前景和重要的研究价值。本论文采用湿化学方法制备了YAG：Ce荧光粉，利用热分析、XRD、SEM、荧光激发光谱与发射光谱等手段，系统研究了各种影响因素（煅烧温度、保温时间、助熔剂、气氛、沉淀剂和pH值以及螯合剂用量）对所制备荧光粉的晶化过程、显微形貌和发光性能的影响规律，比较了各种制备方法的不同特点，分析了荧光粉的发光机理。主要研究结果如下： 1．通过高分子网络凝胶法制备了YAG：Ce荧光粉，研究了煅烧温度、保温时间以及助熔剂和气氛对荧光粉性能的影响，发现煅烧温度对样品晶化过程、显微形貌以及荧光激发和发射光谱有较大的影响，在1000℃下就可以得到...The wet-chemical method was used to prepare the YAG: Ce phosphor in this paper. Effects of calcining temperature, holding time, fluxes, atmosphere, precipitating agent, pH value and chelating agent on crystallization, morphology, and luminescent properties were studied by DTA-TG, XRD, SEM, fluorescence spectrophotometer. We also compared different preparation methods and analysed luminescence prin...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：20043601

关于安溪县生态茶产业高质量发展的建议

福建省安溪县把生态建设作为推进县域经济可持续发展的战略方针,因地制宜开展生态茶产业建设,形成经济发展和生态建设协同发展、相互促进的局面。本文依托社会实践,在深入走访调查的基础上提炼出政府、茶企、专业合作社、行业协会和高校五个主体在安溪生态茶产业建设中发挥的主要作用,总结了安溪县生态茶产业的模式经验,并且针对存在的问题为安溪县打造茶产业生态圈建言献策,供全国其他进行县域经济发展和传统产业转型升级的地区参考

Research Development of Curing Treatment of Polycarbosilane to Prepare Continuous SiC Fibre

［中文文摘］综述了先驱体转化法制备SiC纤维过程中聚碳硅烷(PCS)的各种不熔化处理方式及其发展状况。通过不熔化方式对终烧产物SiC纤维性能的比较,讨论了各种不熔化方式的优缺点及其对SiC纤维中氧含量的影响,并指出了制备高性能SiC纤维不熔化技术研究的国内外差距及发展趋势。［英文文摘］Different curing treatment methods of polycarbosilane fibres in the process of fabricating SiC ceramic fibres by preceramic polymer pyrolysis usually containing polymer synthesis, spinning, curing and pyrolysis, are reviewed in this paper. Current development situation of these manners is thoroughly presented. By comparing the element composition and mechanical properties of SiC fibre from different cross-linking manners, some advantages and drawbacks of these methods, and their effects on the oxygen content in SiCfibre are also discussed. Moreover , the developmental trend of cross　linking technique to fabricate excellent heat2resistant SiC fibres is proposed

Study on the central response mechanism in gastric ulcer rats treated by electroacupuncture using ~1H NMR metabolomics techniques

目的:采用核磁共振氢谱技术(~1H; NMR)研究电针胃经穴治疗应激性胃溃疡大鼠大脑皮质、下丘脑、延髓代谢物谱的表达。方法:40只Wistar大鼠随机分为正常组、模型组、胃经组和胆经; 组。利用束缚冷应激法制备应激性胃溃疡模型大鼠,造模成功后用电针分别刺激胃经组和胆经组相关穴位。收集大鼠大脑皮质、下丘脑、延髓,获取一维~1H; NMR谱,并利用模式识别方法分析各组间的代谢轮廓差异。结果:模型组与正常组、胃经组、胆经组大鼠大脑皮质、下丘脑和延髓代谢物谱均有明显区分,其中正; 常组与模型组分离最明显,胃经组最接近正常组,说明其代谢物谱趋向正常。与模型组比较,胃经组大鼠大脑皮质乳酸、萘乙酸、甘露醇等表达上升(P<0.05; ),而肌酸、腺苷、肌苷等表达下降(P<0.05),下丘脑乳酸、肌醇、谷氨酸酯等表达上升(P<0.05),gamma-氨基丁酸等表达下降(P<0.; 05),延髓乳酸、谷氨酸脂、肌醇、丙氨酸等表达上升(P<0.05),而萘乙酸、肌酸等表达下降(P<0.05)。结论:电针胃经穴可调节胃溃疡大鼠大; 脑皮质、下丘脑、延髓的代谢产物表达,大脑皮质、下丘脑和延髓是电针胃经穴治疗胃溃疡的中枢响应位点。Objective: To study the metabolic profiling of the cerebral cortex,; hypothalamus and medulla oblongata from irritable gastric ulcer rats; treated with electroacupuncture on acupoints of the stomach meridian; with 1H nuclear magnetic resonance (~1H NMR) spectroscopy. Methods:; Forty SD rats are randomly divided into the control group, the model; group, the stomach meridian group and the gallbladder meridian group.; The irritable gastric ulcer rat model was established by water-immersion; and restraint stress method. After modeling, the rats from the stomach; meridian group and the gallbladder meridian group were treated with; electroacupuncture on the stomach meridian and gallbladder meridian; respectively. ~1H NMR spectroscopy was applied to detect the metabolic; profiling of the cerebral cortex, hypothalamus and medulla oblongata,; then analyzed metabolic contour differences among the groups using; pattern recognition method. Results: Obvious distinctions were found; between the metabolites spectrum of the cerebral cortex, hypothalamus; and medulla oblongata from the model group, the normal group, the; stomach meridian group and the gallbladder meridian group. More; significant differences were found between the normal group and the; model group, while the metabolites spectrum of the stomach meridian; group was more distinctly close to that in the normal group, indicating; that metabolites spectrum of the stomach meridian group was likely to; normal. Compared with the model group, the concentration of lactic acid,; acetic acid, mannitol increased while creatine, adenosine and inosine; decreased in cerebral cortex of the stomach meridian group (P<0.05), the; concentration of lactic acid, glutamic acid, inositol and alanine; increased while gamma aminobutyric acid decreased in hypothalamus of the; stomach meridian group (P<0.05), the concentration of lactate,; glutamate, myo-lnositol, alanine increased (P<0.05) and naphthylacetic; acid and creatine decreased in medulla oblongata of the stomach meridian; group (P<0.05). Conclusion: Electroacupuncture on acupoints of the; stomach meridian could regulate specific metabolites in the cerebral; cortex, hypothalamus and medulla oblongata, indicating that the cerebral; cortex, hypothalamus and medulla oblongata as the central response site; in the treatment of gastric ulcer by electroacupuncture on acupoints of; the stomach meridian.国家自然科学基金项目; 广东省自然科学基金项目; 深圳市科技计划项

Research Development of Nearly Stoichiometric SiC Fibers Derived from Polycarbosilane

[中文文摘]综述了聚碳硅烷制备近化学计量比SiC纤维的研究进展,总结了H2在PCS纤维裂解过程中的作用机理,比较了纯H2气氛、分阶段不同气氛、全过程H2/Ar混合气氛条件下得到的SiC纤维的组成和性能变化规律。纯H2气氛800℃以上保温4h,可得到近化学计量比SiC纤维;分阶段气氛下,气氛转换温度为800℃,烧结至1300℃保温1h,可得到近化学计量比SiC纤维;混合气氛下,氢气浓度为60%左右,烧结至1300℃保温1h,可得到近化学计量比SiC纤维。在这些气氛条件下得到的近化学计量比SiC纤维,烧结后的高温力学性能均优于非化学计量比SiC纤维。［英文文摘］Nearly stoichiometric SiC fibers prepared from polycarbosilane in three kinds of atmosphere are studied,namely first in H_2 atmosphere,then in Ar atmosphere and H_2/Ar mixed atmosphere. In pure H_2,when temperature T≥800℃ and holding time t≥4h,the stoichiometric SiC fibers could be got.In the second case,when PCS is pyrolided in H_2 from 25℃ to 800℃, in Ar 800～1300℃ and holded for 1h at 1300℃, stoichiometric SiC fibers could be got.In H_2/Ar, when H_2 concentration is 60% and holded for 1h at 1300℃,stoichiometric SiCfibers could be 2 got. In H / Ar , when H concentration is 60 % and holded for 1h at 1300℃,stoichiometric SiC fibers can be got. The　stoichiometric SiC fibers show great mechanical property in high temperature

电针促进胃黏膜损伤修复的时效关系及分子机制

目的:动态观察电针对胃溃疡模型大鼠胃黏膜损伤修复的影响,探讨电针治疗胃溃疡的时效关系和分子机制。方法:72只SD大鼠分为空白组、模型组、胃经穴组、对照点组,并按干预时间1、4、7 d分为3个亚组,每个亚组6只。采用乙醇灌胃方法制备胃溃疡大鼠模型,胃经穴组电针\"足三里\"\"梁门\",对照点组电针\"梁门\"\"足三里\"外旁开5 mm处,每日1次,每次电针30 min。空白组和模型组用鼠板束缚但不进行电针处理,每日1次,每次30 min。用逆转录-聚合酶链反应(PR-PCR)法检测胃增殖细胞核抗原(PCNA)、P物质(SP)的表达,Western blot检测胃神经降压素(NT)的表达。结果:干预1 d后,模型组溃疡指数显著高于空白组(P0.05),PCNA m RNA、SP m RNA低于模型组(P0.05)。干预7 d后,各组以上指标组间比较差异均无统计学意义(均P>0.05)。结论:电针胃经穴能在胃溃疡发展的不同病理状态下对PCNA m RNA、SP m RNA进行双向调节的平衡作用同时促进NT蛋白高表达,进而促进溃疡的修复。深圳市科技计划项目:JCYJ 20160406140612883;;国家自然科学基金项目:8147375

针药结合治疗湿热型痤疮的临床研究

目的:观察并对比针药结合治疗与常规西药治疗湿热型痤疮的临床疗效。方法:将100例湿热型痤疮患者随机分为针药结合组(n=50)和西药治疗组(n=50),针药结合组采用以口服中药为主并辅以针刺的疗法进行联合治疗,西药治疗组口服米诺环素胶囊,两组均连续治疗4周后观察疗效及皮损的类型、分级、评分和不良反应等。结果:针药结合组与西药治疗组总有效率分别为92. 00%、84. 00%,差异有统计学意义(P 0. 05。结论:针药结合疗法比常规西药治疗更能够显著提高湿热型痤疮的临床疗效。中国中医科学院“十三五”重点领域研究专项(No.ZZ10-011-1-2

重庆市主城区长江和嘉陵江水中有机污染物对斑马鱼胚胎仔鱼的毒性研究

目的以重庆市主城区大溪沟(嘉陵江)和寸滩(长江)两个点为代表,研究2004~2005年度重庆市水源水中有机污染物的组成和对斑马鱼胚胎仔鱼的毒性。方法固相萃取法萃取水中有机污染物,GC/MS检测有机污染物的种类;将萃取的有机污染物溶于DMSO中,并用斑马鱼胚胎仔鱼实验研究水中有机污染物对斑马鱼胚胎孵化率和仔鱼畸形率的影响。结果四个水样中均可检出有机污染物,污染物的种类以酞酸酯类和多环芳烃类为主;污染物可导致斑马鱼胚胎孵化率降低及仔鱼畸形率增加,其毒性呈现出时间和剂量依赖性;同一采样点中,枯水期水样毒性大于

电针“梁门”-“足三里”对急性胃黏膜损伤模型大鼠血清代谢物动态表达的影响

目的采用核磁共振氢谱技术(1H NMR)探讨电针梁门-足三里治疗急性胃黏膜损伤的可能作用机制。方法 54只SD大鼠随机分为正常组、模型组、电针组,各组又分为干预1、4、7天3个时间点,每个时间点6只。除正常组外其余各组采用75%乙醇灌胃法复制急性胃黏膜损伤大鼠模型。造模成功后电针组大鼠用鼠板捆绑固定,采用疏密波(4 Hz,50 Hz),电针"梁门"(负极)"足三里"(正极),每次30 min,每日1次。正常组和模型组大鼠用鼠板捆绑固定30 min,每日1次。分别于干预1、4、7天后光镜观察胃黏膜病理形态,检测大鼠血清1H NMR谱,并利用模式识别方法分析不同干预时间下代谢物谱的差异,用正交偏最小二乘判别分析(OPLS-DA)模型和独立样本t检验,以P <0. 05筛选潜在的生物代谢标志物。结果病理结果显示,正常组大鼠胃黏膜表面细胞完整,未见溃疡性损害。干预1、4天时模型组大鼠可见胃黏膜上皮结构破坏严重,毛细血管增生及出血;干预4天时电针组大鼠胃黏膜的黏膜结构恢复较为完整,较模型组明显改善。血清代谢组学结果显示,正常组与模型组分离出差异代谢物6个:甘油磷酸胆碱、谷氨酰胺、甜菜碱、葡萄糖、乙酸盐和胆碱。与模型组比较,干预1天时电针组胆碱、甘油磷酸胆碱、葡萄糖、乙酸盐、谷氨酰胺和甜菜碱均升高;干预4天时胆碱、葡萄糖、谷氨酰胺和甜菜碱升高,甘油磷酸胆碱和乙酸盐降低;干预7天时甘油磷酸胆碱降低,葡萄糖、乙酸盐、谷氨酰胺和甜菜碱升高,胆碱无明显变化。结论电针"梁门"-"足三里"可有效回调急性胃黏膜损伤大鼠血清相关差异代谢物,恢复相应代谢通路稳定,以电针4天效果最佳,可能是其逆转胃黏膜损伤的作用机制之一。国家自然科学基金(81473751);;深圳市科技计划(JCYJ20160406140612883

艾灸干预胃溃疡大鼠胃黏膜脑肠肽的动态表达

目的:观察艾灸干预胃溃疡大鼠胃黏膜相关脑肠肽的动态表达,探讨艾灸干预胃溃疡的时效关系。方法:SD大鼠72只随机分为3批,各批分为正常组、模型组、胃经穴位组和非经穴位组(n=6)。采用70%乙醇灌胃复制胃溃疡大鼠模型。胃(非)经穴位组的大鼠进行艾灸1、4、7d(30min/d)。干预结束后于光镜下观察胃黏膜形态,RT-PCR测定胃黏膜增殖细胞核抗原(PCNA)及P物质(SP)表达。结果:与正常组比较,模型组大鼠胃黏膜溃疡灶明显,胃黏膜PCNA表达降低(P<0.05),SP表达升高(P<0.05);与模型组比较,干预1d后胃经穴位组大鼠胃黏膜PCNA表达升高(P<0.05),干预4d后胃经穴位组PCNA表达升高(P<0.05),SP降低(P<0.05);干预7d后各组大鼠胃黏膜PCNA及SP表达无显著差异。结论:艾灸胃经穴位能有效调节相关脑肠肽指标,促进胃黏膜损伤修复,并具有一定的时效关系。深圳创新科技计划项目(No.JCYJ20160406140612883);;国家自然科学基金项目(No.81473751);;国家重点基础研究发展计划(973计划)(No.2015CB554502)~