基于一维TiO2纳米管阵列薄膜的β伏特效应研究

介绍了一种采用宽禁带半导体二氧化钛纳米管阵列薄膜材料制备β伏特效应同位素电池的方法.通过对金属钛片的电化学阳极氧化制备了垂直定向、有序排列的二氧化钛纳米管阵列薄膜,研究了退火条件对二氧化钛纳米管阵列薄膜半导体光电性能的影响.通过与镍-63辐射源的集成封装,形成三明治结构镍-63/二氧化钛纳米管阵列薄膜/钛片的β伏特同位素电池.实验结果表明,基于氩气氛围下450?C退火的黑色二氧化钛纳米管阵列薄膜具有高的氧空位缺陷浓度和宽的可见-紫外吸收光谱.在使用β辐射总能量为10 m Ci的镍-63辐射源时,同位素电池的开路电压为1.02 V,短路电流75.52 n A,最大有效转换效率为22.48%.国家自然科学基金(批准号:61574117);;深圳市科技计划项目(批准号:JCYJ20170306141006600)资助的课题~

Growth and Properties of Ultra Thin GeO_2 by Rapid Thermal Oxidation

超薄氧化锗对钝化gE MOSfET器件中高介电常数栅介质与gE界面具有重要的意义。通过研究400~550℃下快速热氧化锗制备氧化锗的过程及其性质,发现在一定温度下较短的氧化时间内,氧化锗的厚度随氧化时间的增加呈明显的两段线性关系。在开始阶段,氧化锗具有高的生长速率;当氧化锗厚度达到一定值(与温度相关)时,氧化速率变慢,与dEAl-grOVE氧化模型中的线性生长速率基本一致。X射线光电子能谱(XPS)测试结果表明氧化锗中存在不同价态的gE,且随着氧化时间的增加,氧化锗的氧化程度逐渐提高。在550℃下氧化180 S形成的氧化锗用于gE-MOS结构,C-V特性表明在禁带中央处获得了较小的界面态密度,达到1.7x1012 CM-2EV-1。It was demonstrated that the ultra thin germanium oxide was effective to passivate the high-k dielectric/Ge interface for fabrication of high performance germanium MOSFET.The properties of the ultra thin germanium oxide formed by rapid thermal oxidation were investigated which were in temperature range from 400 ℃ to 550 ℃.The two distinct linear relationships between germanium oxide thickness and oxidation time are observed during the initial oxidation of Ge.At the very beginning,the oxidation rate is very high,which is reduced significantly when the oxide thickness reaches a certain value(depending on oxidation temperature).The slower oxidation rate on the later stage is in fair agreement with the prediction of Deal-Grove model.The X-ray photoelectron spectra from the germanium oxide reveals that the various of chemical states of Ge exist in the oxide and the degree of oxidation of Ge increases with oxidation time.The capacitance-voltage characteristics of the Ge MOS structure with germanium oxide fabricated at 550 ℃ for 180 s shows small hysteresis and relatively lower interface state density of 1.7×1012 cm-2eV-1 at midgap.国家重大研究计划项目(2012CB933503);国家自然基金(61036003;61176092;60837001);中央高校基础业务费项目(2010121056

海洋浮游植物自动分析和识别技术

浮游植物是海洋生态系统的初级生产者,对其种类的分类鉴定和定量分析是海洋科学研究和应用的基础性工作.传统的分析方法主要采用显微镜下的人工鉴定和定量计数.为了适应海洋科学和环境监测中的快速检测的需要,解决目前显微镜人工鉴定中存在的专业水平要求高、分类人员断层、耗时等问题,至今已有不少学者对各种浮游植物自动分析和识别方法进行了研究,包括基于藻细胞形态的与计算机技术相结合的图像法,基于藻类色素组成的吸光光度法、荧光分光光度法和高压液相色谱法,基于藻细胞大小、色素组成、DNA等的流式细胞仪法,基于细胞基因系列的分子探针法等.本文对这些方法的原理、发展动态、优缺点等进行了综述.认为基于藻细胞形态的浮游植物显微图像自动识别技术,由于其综合了现代仪器自动分析和传统显微分类方法的优点,是浮游植物自动识别的一种理想和实用的方法,将有很好的应用前景

Diatom diet selectivity by early post-larval abalone Haliotis diversicolor supertexta under hatchery conditions

Benthic diatoms constitute the primary diet of abalone during their early stages of development.To evaluate the dietary preferences of early post-larval abalone,Haliotis diversicolor supertexta,we analyzed the gut contents of post-larvae that settled on diatom films.We compared the abundance and species diversity of diatom assemblages in the gut to those of the epiphytic diatom assemblages on the attachment films,and identified 40 benthic diatom species in the gut contents of post-larvae 12 to 24 d after settlement.The most abundant taxa in the gut contents were Navicula spp.,Amphora copulate,and Amphora coffeaeformis.Navicula spp.accounted for 64.0% of the cell density.In the attachment films,we identified 110 diatom species belonging to 38 genera.Pennate diatoms were the dominant members including the species Amphiprora alata,Cocconeis placentula var.euglypta,Cylindrotheca closterium,Navicula sp.2,and A.coffeaeformis.Nano-diatoms(<20 μm in length) accounted for a considerable proportion of the total species..

基于OSNR感知的SDON路径优化机制

随着SDON（软件定义光网络）向着超高速大容量方向发展,网络规模日益庞大,光路长度的增长面临着各种信号损伤的问题。为此,文章提出了一种基于OSNR（光信噪比）感知的路径优化机制。该机制将光信噪性能作为建立光路连接的重要判断条件,并在光网络的流表交互过程中引入OSNR因素,从而避免接收端节点因误码率过高而导致通信阻塞。仿真结果表明,所提机制在非理想的光网络环境下能够有效提高光路建立的成功率

涡重联过程中背景涡量增长的机制研究

采用拟谱方法求解N-S方程，直接模拟了两个反向平行涡管的重联过程，考察了各种扰动方式对涡重联的影响，发现了“弧形涡带”现象，分析了背景涡量增长的物理机制

培养一种海洋绿藻积累淀粉

Starch constitutes a major carbon sink for CO2 fixation during the process of photosynthesis of microalgae. Some microalgae, primarily green algae, have been proved to accumulate large amount of intracellular starch under stress conditions. It is strikingly valuable and important for production of algal-derived starch in large scale to meet the demand for renewable and clean energy (bioethanol, bio-hydrogen, etc.). A marine green microalga Tetraselmis subcordiformis was investigated its growth as well as intracellular starch accumulation in a 10L flat airlift photobioreactor (420×80×500 mm) with inside channel under continuous illumination (120~250 μ mol E &#8226; m-2 &#8226; s-1) at 30℃. 3% CO2- rich air was compressed into the photobioreactor to reach the aeration of 0.125 VVM. The results showed that under nitrogen limiting condition (1.18 mmol/L initial NO3-), T. subcordiformis was able to accumulate starch from initially 20% (dry weight based) to more than 50% within five days. The decline of chlorophyll florescence dynamics parameters might be attributed to the starch accumulation under the photosynthetic stressed condition

Sensitized Lanthanide Luminescence in AOT Reversed Micelles——Purine Compounds as Energy Donor

研究了反相胶束体系中敏化Tb--(3+)的离子荧光.在AOT/C_6H_(12)/H_2O反相胶束溶液中[AOT:琥珀酸二(2-乙基己基)酯磺酸钠]发生了非常有效的从茶碱的三重态到Tb--(3+)的4f能层的能量转移,并敏化稀土离子Tb--(3+)产生离子荧光.而在阳离子表面活性剂CTAb形成的反相胶束体系中,只能观察到较弱的Tb--(3+)的离子荧光.表明在AOT反相胶束中Tb--(3+)是键合在碘酸头基上,有利于能量转移过程,显著增强Tb--(3+)的离子荧光.通过发光光谱和寿命测量,详细讨论了AOT浓度和水泡大小(W值)等对敏化离子荧光的影响,表明与Tb--(3+)离子水合的水分子的高频OH振动猝灭Tb--(3+)的离子发光,该猝灭过程属静态猝灭.在较低的AOT浓度和较小的W值下,可观察到较强的Tb--(3+)离子荧光,并建立了AOT反相胶束中五种嘌呤类化合物的分析方法,检出限在8.0x10--(-9)~8.0x10--(-7)MOl·dM--(-3)之间.Sensitized lanthanide luminescence by purine compounds in AOT reversed micelles has been studied.A signiFicant enhancement of sensitized room temperature luminescence has been observed using lanthanide Tb3+ as energy acceptor in AOT reversed micelles at low AOT concentration and W value, and weak Tb3+ emission has been observed in CTAB reversed micelles.The results indicate that Tb3 + ions are strongly bound to the sulFonate group of the AOT surFactant.Parameters including the concentration of AOT,solubilized water as well as acceptor concentration that may inFluence the sensitized lanthanide luminescence have been examined.The characteristics of luminescence and liFetimes of Tb3+ were used to elucidate the Factors that aFFected sensitized luminescence.The results show that Tb3+ emission is quenched by the high Frequency OH vibrations of the surrounding water molecules, the loss of Tb3 + emission in high AOT concentration and W value suggests that the Tb3+ cation retains water in its coordination sites.The quenching process is static quenching.The low AOT concentration and W value should be reconmmended For obtaining high sensitivity in analytical application.The detection limits For purine and its deriviations are between 8.0×10-9-8.0×10-7mol·dm-3

环己烷存在下环糊精诱导a-溴代萘室温燐光

微量环己烷存在下,β-环糊精能诱导α-溴代萘发射强的室温燐光.发光光谱、燐光寿命和荧光偏振的实验证实了β-环糊精一环已烷一α-溴代萘三元包络物的形成.测定了三元包络物的表观形成常数,讨论了环已烷对β-环糊精诱导α-溴代萘室温燐光的影响机制

耦联系统的应用：微藻培养与生物乙醇生产相耦联实现CO2循环

APPLICATION OF A COUPLING SYSTEM: MICROALGAE CULTIVATION COUPLED TO BIOETHANOL PRODUCTION FOR CARBON DIOXIDE RECYCLIN