翼反角对高压捕获翼构型高超气动特性的影响

为研究翼反角变化对高压捕获翼构型高超声速气动特性的影响，基于一种双翼面、单支撑、翼身组合布局的高压捕获翼概念构型，以飞行马赫数6，飞行高度30km为计算状态，捕获翼和机体三角翼上/下反角为设计变量，结合均匀试验设计方法、数值模拟方法和Kriging建模方法，探寻了升阻特性、纵向和横航向稳定性随翼反角的变化规律。结果表明，升力、阻力及升阻比随翼反角的变化规律基本一致，且对上反角变化更加敏感；小攻角时，翼面上反会明显降低升阻比，而下反会使升阻比先略微增大后缓慢减小；大攻角时，翼反角对升阻比的影响较小；纵向稳定性主要受三角翼反角的影响，三角翼上反时，纵向稳定性降低，下反时，纵向稳定性基本不变；翼面上/下反都会提高航向稳定性，但下反的效果更明显；翼面上反会提高横向稳定性，下反则降低，但大攻角飞行时，三角翼上反角过大可能会导致横向稳定性降低

The Characteristic of Calcium Distribution in Developing Female Gametophyte of Allium tuberosum

对韭开花前1 d到开花后2 d的发育胚囊中CA2+分布特征进行研究,结果显示:在开花前1 d游离核胚囊形成细胞,CA2+主要分布在极核周围的细胞质小液泡中,与中央细胞的大液泡形成有关;在开花当天,卵细胞大液泡体中CA2+增多,与其大液泡形成有关;开花后1 d,卵细胞大液泡中钙沉淀颗粒减少,助细胞珠孔段的CA2+增多,合点端较少,呈极性分布;开花后2 d,卵细胞大液泡和中央细胞大液泡珠孔部位CA2+再次明显增加。助细胞珠孔端丝状器中CA2+也增加,一个助细胞退化,呈现接受花粉管状态。韭发育胚囊中CA2+分布特征显示其参与调控胚囊细胞的分化,揭示雌配子体中CA2+分布的时空特征是深入研究胚囊细胞分化的基础。Characteristic of Ca2+ distribution in developing female gametophyte of Allium tuberosum was studied from 1 d before anthesis to 2 d a fter anthesis.At 1 d before anthesis, the nuclear embryo sac differentiates gametophyte cells.Calcium precipitates of young embryo sac were few and mainly located in the small vacuoles surrounding polar nuclei, suggesting Ca2+ relating with the formation of the large vacuole of central cell.At anthesis, the precipitates in large vacuole of egg increased, also suggesting Ca2+ relating with formation of the large vacuole of egg cell.At 1 d after anthesis, the precipitates in egg cell decreased and increased in synergid cells, in which the precipitates displayed polarity distribution: more in the micropyle end of the cell than in the chalazal end.At 2 d after anthesis, the precipitates in the large vacuole of egg and the micropyle part of central cell appeared again.The precipitates in filiform apparatus of both synergids also increased.One synergid cell degenerated, which prepared to accept pollen tube.The characteristic of calcium distribution in developing embryo sac of A.tuberosum suggests that Ca2+ may regulate cell differentiation of embryo sac.Exploring the spatial-temporal feature of Ca2+distribution in developing embryo sac is a base of further study of cell differentiation of embryo sac.国家自然科学基金(31170289); 公益性行业(农业)科研专项课题(200903016

材料燃烧失效与防火阻燃特色课程体系建设的探索

阐述材料燃烧失效与防火阻燃课程建设的基本构想、定位和教学思路;从教材及教学内容优化、加强实验教学与革新教学方法、强化实践教学、规范课程管理模式入手,将其建设成材料学科的特色课程。国家自然科学基金(51173153;51103123); 福建省重大科技平台建设基金(2009J1009)、产学重大专项(2010H6021)、科技重点项目(2007T0013;2008H0033)、自然科学基金项目(2012J01234); 厦门市科技项目(3502Z20031078;3502Z20041054;3502Z20070010;3502Z20073006;3502Z20081045;3502Z20103004;3502Z20120015); 福建省产学研联合开发(省属)专项(闽经贸计

Surface Plasmon-coupled Emission of Multicolor Quantum Dots

E-mail: [email protected][中文文摘]以巯基小分子为配体水相合成CdTe量子点,通过调节回流时间调控其粒径大小.由于量子点的宽谱激发特性,在蓝光(473 nm)或绿光(532 nm)条件下,纳米金属薄膜表面不同发射波长的CdTe量子点均可被激发而与金属表面等离子体发生耦合相互作用,从而在棱镜一侧发出高度定向的偏振荧光,其荧光特性与样品厚度密切相关.表面等离子体耦合荧光发射法(SPCE)具有波长分辨性质,不同颜色的量子点在不同角度定向发射,发射波长越长,角度越小.720nm和630 nm量子点的自由空间发射荧光光谱呈现交叠,然而,基于SPCE的波长分辨性质,我们通过改变检测角度避开光谱重叠,在棱镜一侧的43o和51o处分别得到了两种量子点的SPCE荧光单峰.量子点是SPCE在多通路、高通量检测应用中荧光物种的理想选择.[英文文摘]Aqueous CdTe quantum dots(QDs) were synthesized employing thiols as stabilizing ligands and their emission wavelengths could be tuned by controlling the reflux time.Surface plasmon-coupled emission(SPCE) properties of multicolor CdTe QDs were studied by using a laboratory-built multifunctional spectrofluorimeter.To fabricate a CdTe QDs-doped complete film onto the surface of continuous thin metal films,CdTe QDs were spin-coated at 3000 r/min with poly(vinyl alcohol)(PVA) solution of various concentrations.For SPCE measurements, the spin-coated slides were attached to a semi-cylindrical prism made of fused silica with a refractive-index-matching fluid and then positioned on a precise rotary stage that allowed for excitation and emission observation at any angle relative to the vertical axis of the stage. For excitation, we used the reverse Kretschmann (RK) configuration and the incident light was normal to the sample interface. The spectra were measured using a monochromator equipped with a photomultiplier tube. The experimental results showed CdTe QDs located nearby continuous thin metal film could be excited using either blue (473 nm) or green (532 nm) laser as a result of their broad excitations and their emissions resulting from the surface plasmon coupling were strongly directional, highly polarized and closely related to sample thickness. Because of the wavelength-resolution property of SPCE, CdTe QDs with different emission wavelengths were found to emit at different fixed angles, longer wavelengths corresponding to smaller angles. The free space emission spectra of 720 nm and 630 nm CdTe QDs in a mixture were overlapped and could not be separated at any detection angle. However, owing to the unique wavelength resolution ability of SPCE, the spectra of 720 nm and 630 nm CdTe QDs were obtained at 43° and 51º on the prism side, respectively. The determination of each component of the mixtures of CdTe QDs was achieved by changing the detection angle to avoid spectral overlap. Therefore, QDs are ideal fluorophores for SPCE in high-throughput, multiplex analysis application.国家自然科学基金(Nos.21127005,20975084); 国家973计划(No.2013CB933703); 教育部博士点基金(No.20110121110011)资

Effect of Temperature on Sensing Performance of Optical Fiber Relative Humidity Sensor Based on Nafion-crystal Violet Film

The optical fiber relative humidity sensor based on Nafion-crystal violet film was developed. The effect of samples temperature in the range from 299.15 K to 324.15 K on the sensing performance of the sensor was investigated. The mathematical function between temperature and the sensitivity of the sensor was established according to the reactive theory of sensor to the relative humidity, which was validated with the experiment. With the research, the application range of the sensor was extended, which made the sensor keep a good veracity when it was used in situ.国家“八六三”计划海洋监测技术主题项目(批准号:818-09-07)资助

水痘-带状疱疹病毒糖蛋白gE在昆虫细胞中的表达鉴定及其晶体培养

目的利用杆状病毒-昆虫表达系统建立纯化水痘带状疱疹病毒(VZV)包膜糖蛋白gE的方法,筛选gE蛋白的晶体培养条件,以期用于结构解析。方法将VZV糖蛋白gE基因序列克隆至杆状表达载体pAcgp67B载体中,利用High FiveTM昆虫细胞表达gE蛋白并进行TALON亲和层析纯化;利用WAVE生物波浪反应器建立含硒代甲硫氨酸的gE蛋白方法,以便在晶体结构解析中利用单波长或多波长异常散射进行相位解析;通过分子排阻色谱、分析超离,差示扫描量热法和酶联免疫吸附试验等分析gE蛋白的理化性质;利用结晶试剂盒对gE498和gE354蛋白的结晶条件进行初筛。结果获得的gE498和gE354蛋白纯度约为90%、产量为8～10 mg/L。理化分析显示两种gE蛋白在溶液中主要以均一稳定的单体形式存在,并呈现出良好的反应原性。在gE354晶体初筛中获得3个结晶条件:CrystalH3、PEGH12和IndexB10。结论建立了VZV糖蛋白gE表达和纯化方法,制备的蛋白纯度高,且具有反应原性,并筛选出CrystalH3、PEGH12和IndexB10这3个结晶条件,为gE糖蛋白的结构与功能研究及新型疫苗开发奠定了基础。国家自然科学基金项目(No.81871648);;\n新药创制专项项目(No.2018ZX09711003-005

防火涂层材料研究及产业化中的关键技术开发的研究进展

综述了近年来钢结构建筑防火涂料、隧道防火涂料领域的国内外研究进展,重点叙述了本课题组在该领域近10年来取得的研究成果和产业化情况.在防火涂层材料的研究中,本课题组凝练出以下关键技术:功能性填料复配技术,提高功能组分的协同作用;功能性填充料的表面处理技术,解决了涂料相结构稳定性和膨胀炭层强度、均匀性、膨胀倍率等制约涂层防火性能的关键技术;聚合物/层状硅酸盐纳米插层技术在隧道防火涂料领域的首次应用;聚合物粘结剂和无机凝胶材料复配技术,提高涂层粘结性能的高温连续性,改善涂层耐水性、柔韧性;复合纤维自替代技术,实现耐火性能的连续性;超细活性粉料低温烧结技术,使涂层在较宽的温度下烧结形成陶瓷面(体),极大地提高了涂层高温下的强度和耐火性能

基于原位自由基共聚技术的复合水凝胶制备及表征

以聚乙二醇与马来酸酐的双酯化产物(MAh-PEG-MAh)、丙烯酰胺(AM)为单体,N,N’-亚甲基双丙烯酰胺(BIS)或对二乙烯基苯(DVB)为交联剂,通过原位自由基共聚法合成了一种复合水凝胶。利用FT-IR、1H-NMR、SEM、TEM表征了凝胶结构和形态;利用XRD研究了凝胶的结晶性;研究了单体用量、分子链段长度、交联剂等因素对凝胶力学性能的影响。研究表明,柔性链段MAh-PEG-MAh以一定尺寸的聚集微区分散于PAM连续相,增强水凝胶的结晶性,且分散相与连续相之间有良好的作用力,当MAh-PEG1K-MAh与AM的物质的量比为1∶8,复合水凝胶的压缩强度达到18.2 MPa左右,力学性能最佳

Effect of temperature on sensing performance of optical fiber relative humidity sensor based on nafion-crystal violet film

The optical fiber relative humidity sensor based on Nafion-crystal violet film was developed. The effect of sample's temperature in the range from 299.15 K to 324.15 K on the sensing performance of the sensor was investigated. The mathematical function between temperature and the sensitivity of the sensor was established according to the reactive theory of sensor to the relative humidity, which was validated with the experiment. With the research, the application range of the sensor was extended, which made the sensor keep a good veracity when it was used in situ