Syntheses, Characterizations and Gas Sensing Properties of ZnO nanomaterials

ZnO由于氧的空位，使它具有半导体的性质，它的禁带宽度约为3.2eV，属于一种宽禁带的氧化物半导体。它在很多方面都有所应用，如气体传感器、微电子器件、光催化、水污染处理等。ZnO气体传感器可以检测各种易燃易爆、有毒有害气体，将外界非电信号转换为电信号，它是传感技术的关键,因此ZnO在气体传感器方面的应用备受人们的瞩目。在本论文中，研究了各种ZnO纳米结构的气敏性质，包括各种表面形貌的ZnO，ZnO复合材料和掺杂的ZnO，主要内容如下：1)通过热分解前驱物，如片状的碱式醋酸锌和片状甘油锌，合成了各种具有分级结构的ZnO片，而且通过简单地控制分解温度，可以得到一系列尺寸大小不一样的颗粒组成的ZnO...ZnO, known as one of the wide band metal oxide semiconductors, has a characteristic of semiconductor because of the oxygen vacancy, which has a forbidden band of about 3.2eV. ZnO has been applied in many fields, such as gas sensors, micro/nano electronic devices, photocatalysts, waste water treatment etc. Gas sensors are used for monitoring or detecting various flammable and poisonous gases. It us...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：2005130190

The structure and function of male gonopod of Scylla serrata

【中文摘要】 于2000年6月至2002年10月,采用扫描电镜方法对锯缘青蟹(Scylla serrata)雄性附肢结构进行观察。结果表明,青蟹雄体输精管在第八胸节通向一个短的肌肉质的阴茎开口。第一腹肢由一个基部原肢和一个延长的内肢组成,表皮环包,形成一个交接管。第二腹肢吻合这个表皮管,而阴茎则放在内肢的基部侧面。交配时,阴茎在肌肉作用下,精液射到第一腹肢的射精管中,射出物在第二腹肢的活塞样的泵作用下,沿着管腔向里推进。第一腹肢顶端侧扁状、具侧缝,前部表面具棘突状和腺体孔,弯曲部棘较大。侧缝处具细长的棘和羽状刚毛,刚毛基部为杯状凹陷。 【英文摘要】 Structure and function of the gonopod in mud crab,Scylla serrata,were studied with electron microscope techniques from June 2000 to December 2002.The ejaculatory duct of Scylla serrata opens on the coxae or sternum of eighth segment by short muscular penis.The first gonopod consists of a basal protopodite and an elongated endopodite,in which the cuticle folded the entire length of a tube which functions as an ejaculatory canal.The second pleopod fits into this cuticular fold,while the penis fits into a slit...国家“八六三”重大专项基金(2002AA603013);国家自然科学基金(39870563

Concentration Protile of Etchant Measured by Microelectrode Technique in the Process of Chemical Micromachining

利用微圆盘电极技术,测定了KBr、L-胱氨酸和硫酸组成的刻蚀溶液体系中Pt电极表面电化学氧化产生的刻蚀剂Br2浓度分布,为约束刻蚀剂层技术(CELT)中刻蚀体系的选择和优化提供更直观的依据.GaAs表面CELT微加工实验证明了用微圆盘电极测得的表面刻蚀剂的浓度分布趋势与微加工实验所得到的结果一致.A carbon-disk microelectrode was used to investigate the surface concentration profile of etchant Br2, which was electrogenerated on the Pt working electrode. The steady state reducing currents of Br2 at different distances away from the Pt electode was measured. The concentration profile was estimated from the current-distance variation curves as a function of different sampling times. Experimentally determined concentration profiles are in good agreement with those estimated from the microetching results. The microelectrode technique has offered a good method to choose suitable etching solution for chemical micromachining.国家高新技术发展规划(863项目)(2002AA404170);; 福建省自然科学基金计划资助项目(E0520001

Purification and characterization of lectin from humoral fluids of Charybdis feriatus

【英文摘要】 To search new sources of lectin, an experiment on lectin distribution in humoral serum of crab Charybdis feriatus (in short, CFL) was conducted March, 2002. When adding solid ammonium sul-fate into the fluids up to 50% saturation at 4℃, most CFL activity showed precipitates who were then continually extracted by ammonium sulfate of different concentrations. The supernatant, which was called primary CFL fluids, was given a 17.60-fold purification and 45.70% recovery of total activity. Finally, by using Sepha...Supported by Project of Technology Bureau of Quanzhou of Fujian Province(Z200239) , and by the Fujian Natural Science Foundation (B0410027

Concentration protile of etchant measured by microelectrode technique in the process of chemical micromachining

A carbon-disk microelectrode was used to investigate the surface concentration profile of etchant Br-2, which was electrogenerated on the Pt working electrode. The steady state reducing currents of Br-2 at different distances away from the Pt electode was measured. The concentration profile was estimated from the current-distance variation curves as a function of different sampling times. Experimentally determined concentration profiles are in good agreement with those estimated from the microetching results. The microelectrode technique has offered a good method to choose suitable etching solution for chemical micromachining

搅拌釜内氯化钾降温结晶的实验研究

在50 L结晶罐中,通过降温结晶的方法,提纯KCl固体。采用间歇动态法,考察了搅拌转速、降温速率、搅拌器位置、晶种加入量对KCl晶体过程的粒度分布影响。实验结果表明,以上因素均会对晶体的成核、生长产生影响。操作条件控制在270 r/min、晶种量390 g、冷却水流量0.43 m3/h、搅拌器位置C/H=0.22(C,搅拌器离底高度;H,液位高度),可以得到晶体粒径分布集中、粒径较大的KCl晶体颗粒。</p

脱落酸·吲哚丁酸在水稻上的应用研究

采用水稻移栽前10 d秧田期药剂处理,研究了脱落酸·吲哚丁酸和脱落酸对水稻的影响.两年试验结果表明:水稻移栽后15 d,脱落酸·吲哚丁酸33.3、50.0和100.0 mr/kg处理.秧苗分蘖数平均比清水对照增加15.63%、17.52%和15.78%;脱落酸1.0 mg/kg处理分蘖数增加5.38%.水稻移栽后30 d.脱落酸·吲哚丁酸上述3种浓度处理秧苗分蘖数依次增加8.88%、10.63%和9.16%;脱落酸处理增加0.87%.水稻成熟期调查,脱落酸·吲哚丁酸3种浓度和脱落酸处理.有效穗、结实数均比清水对照有所提高.脱落酸·吲哚丁酸33.3、50.0和100.0 me/kg处理和脱落酸1.0mg,/kg处理,水稻实收产量顺次比清水对照增产4.95%、6.03%、9.35%和5.89%.品质测定结果显示:脱落酸·吲哚丁酸3种浓度处理和脱落酸处理.稻米垩百度、蛋白质等质量指标与清水对照相比无明显变化

适用于光发射机设计的实用VCSEL小信号等效电路模型

提出了一个适用于发射机中驱动电路设计的具有较高计算效率、能准确反映不同频率时与驱动电路互作用的VCSEL等效电路模型．用曲线拟合的方法结合惠普网络分析仪测得的VCSEL反射参数S11，准确地得到了等效电路模型的各个参数值，并将此等效电路模型应用到设计驱动电路的模拟中．在标准EDA环境SPICE中对驱动电路和模型进行了协同模拟，与过于简化的VCSEL模型进行了对比，通过设计驱动电路芯片证明了此模型的有效性