Μελέτη πόλωσης του φωτός και των οπτικά ενεργών ουσιών
ΦΥΣΙΚΗ ΙΙ [ΠΟΛΥΤEΧΝEΙΟ ΚΡΗΤΗΣ, ΣΧΟΛΗ ΜΗΧΑΝΙΚΩΝ ΠΑΡΑΓΩΓΗΣ ΚΑΙ ΔΙΟΙΚΗΣΗΣ, ΤΜΗΜΑ ΜΗΧΑΝΙΚΩΝ ΠΑΡΑΓΩΓΗΣ ΚΑΙ ΔΙΟΙΚΗΣΗΣ]
Materials Literature
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真空烧结技术制备Er：（Yb_（1–x）La_x）_2O_3透明陶瓷
采用冷等静压-真空烧结技术制备尺寸为？10 mm×l mm的Er：（Yb1–xLax）2O3陶瓷。通过分析粉体的X射线衍射谱和陶瓷的扫描电子显微镜照片,确定陶瓷制备条件为：在1 750℃烧结20 h和在1 450℃退火20 h。陶瓷样品在可见光波段透过率为50%左右,在近红外波段透过率最高达到82%。测试了陶瓷的吸收光谱、发射光谱和上转换发射光谱,并探讨了上转换发光机制。结果表明：陶瓷在977 nm处有强吸收,发射最强峰在1 545 nm处,上转换发出较强的绿光（542 nm）和蓝光（484 nm）。
Long lived gamma emitters in Biscuit Samples consumed in Iraq
Biscuit is important type of food that is widely consumed by baby in Iraq and other countries. This work measurers the natural radioactivity duo to long-lived gamma emitters in Children biscuit by gamma spectroscopy, and estimates radiation hazard indices which are the radium equivalent activity, the representative of…
Desarrollo de nuevos materiales de carbono nanoestructurado y su aplicación en condensadores electroquímicos
En el presente trabajo de Tesis se obtuvieron ocho materiales de carbono a partir de la reaccion de cloracion de los precursores organometalicos Ti(C5H5)2Cl2 y Zr(C5H5)2Cl2 a 900°C, variando el tiempo de reaccion a 30, 60, 90 y 120 min. Las muestras de carbono se analizaron micro estructuralmente por espectroscopia Ra…
Investigation of trap states in Al2O3 InAlN/GaN metal–oxide–semiconductor high-electron-mobility transistors
In this paper the trapping effects in Al2O3/In0.17Al0.83N/Ga N MOS-HEMT(here, HEMT stands for high electron mobility transistor) are investigated by frequency-dependent capacitance and conductance analysis. The trap states are found at both the Al2O3/In Al N and In Al N/Ga N interface. Trap states in In Al N/Ga N hete…
形变热处理对Cu-2.3Fe-0.03P合金组织与性能的研究
应用一种短流程制备技术生产Cu-2.3Fe-0.03P合金带材。合金经过在线热轧淬火以及80%变形量的冷加工后,展示了优良的再结晶抗软化性能。分别利用硬度计及双电桥法测量计算合金的硬度和电导率,利用光学显微镜和透射显微镜观察样品的显微组织。成品Cu-2.3Fe-0.03P合金的主要强化方式为加工硬化,尺寸大约为25 nm的Fe粒子起到稳定冷轧组织的作用。大变形量冷轧会使得合金电导率下降,特别是预时效的样品其电导率下降更多,其主要原因为冷轧过程中小于5 nm的微细粒子容易重新回溶到基体中。实验获得了电导率为66%IACS和硬度为HV 134的Cu-Fe-P合金。
Acid Group이 도입된 TPV (Thermoplastic Vulcanizate)계열가소성 탄성체의 기계적 물성에 관한 연구
본 연구에서는 carboxylic acid group이 도입된 열가소성 폴리우레탄(thermoplastic polyurethane,TPU)과 동적 가교형 TPV (thermoplastic vulcanizate)계 열가소성 탄성체를 제조하였으며, 탄성체 분자구조 내 acid group의 도입에 따른 기계적 물성, 그립성, 데브리스, 접촉각 및 접착특성 변화에 대해서 평가하였다. 연구결과 acid group이 도입된 경우 수소결합의 증가로 인해 기계적 물성과wet slip 특성이 향상되었으며, 카르복시산에 의해 표면 극성이 증가되었기 때문에 접착력 또한 향상되었다. 그…
Interaction of LSP resonances and Fabry-Perot cavity modes
Keywords: Nanophotonics ; Plasmonics Reference EPFL-CONF-217177 Record created on 2016-03-07, modified on 2017-05-10
Equipment for bearing housing change of work rolls in a steckel mill
Outokumpu Stainless AB operates in the production and development of stainless steels. In their hot rolling mill in Avesta there is a need to introduce an equipment to shift bearing housings on the steckel mill work rolls. Today this is accomplished manually with an overhead crane, jack, sledgehammer and pry-bar. It c…
Surface structure and catalytic performance of Sr-doped La2NiAlO6 double perovskite catalysts for methane combustion
A species of novel Sr-doped rare earth double perovskite catalysts(La2-xSrxNiAlO6,x=0,0.1) were prepared by the sol-gel method using citric acid as a complexing agent and calcined at 1100 ℃ for 3 h,then investigated for methane catalytic combustion.The as-prepared catalysts were characterized by X-ray diffraction patt…
The structures of ZnO/Al2O3 superlattices grown by Atomic Layer Deposition
Attempts were made to grow epitaxial ZnO/AlOx superlattice structures by Atomic Layer Deposition (ALD) at 177EC on (0001)-oriented sapphire (I±-Al2O3) and (100)-oriented Si substrates. In order to systematically search for epitaxial growth conditions, the total numbers of the alternating cycles were first set at 300 a…
Estimating the influence of hydraulic shot blasting on the endurance limit of hollow cylindrical specimens by the initial deformations of a reference specimen
It is established that the difference between the calculated values of endurance limit increments under bending and the experimental ones for hollow specimens made of steel 45 of various diameter (15–50 mm) with notches hardened by shot blasting does not exceed 7%.
Elaboration, caractérisation et étude des propriétés physico-chimiques des matériaux conducteurs pour les cellules photosolaires organiques solides
In this work, we have develop dye sensitized solar cens namely Grâtzel cells (DSSC), where we have replaced the 1371 redox couple used as hole transporting material (HTM), by a conducting polymer (CP) generated using in situ electro¬assisted photopolymerization (PEP). The use of a CP as HTM, nor the production of CP b…
УДОСКОНАЛЕННЯ КЕРУВАННЯ ТЕХНІЧНИМ СТАНОМ ПІДЙОМНО-ТРАНСПОРТНИХ МАШИН
The article presents the typical direction of industrial machines, as well as the issues of the modern concept of total quality management that exists in the operating companies.On the basis of a broad analysis of the existing methods for improving the management of the technical condition of machines in various secto…
Atomistic simulations of dynamic interaction between grain boundaries and solute clusters
Microstructure evolution during material processing is determined by a number of factors, such as the kinetics of grain boundary migration in the presence of impurities, which can take form of solid solution, second-phase precipitates or clusters. The dynamic interaction between grain boundaries and clusters has not b…
Defect-related tunneling contributions to subthreshold forward current in GaN-Based LEDs
A semi-classical model describing electron and hole trap-assisted tunneling (TAT), which accounts for multiphonon and elastic transitions, is presented and tested on different single-quantum-well light-emitting diode (LED) structures. Our numerical and experimental study confirms that TAT constitutes one of the main c…
吸放氢对La_（0.8）Ce_（0.2）Fe_（11.44）Si_（1.56）合金磁热性能的影响
通过吸氢、放氢调节La0.8Ce0.2Fe11.44Si1.56Hy合金的居里温度,利用X射线衍射物相分析（XRD）和振动样品磁强计（VSM）测量了合金的相结构和磁性曲线。结果表明：La0.8Ce0.2Fe11.44Si1.56合金吸氢后磁性能稳定,同时由于巡游电子变磁（IEM）转变减弱导致磁滞显著减小,但可以保持较大等温磁熵变。在0~1.5 T外加磁场下La0.8Ce0.2Fe11.44Si1.56Hy合金的最大等温磁熵变可以达到11.3 J·（kg·K）-1,大约是金属Gd的4倍。一定温度下、不同保温时间的放氢工艺可对氢含量进行微调,使La0.8Ce0.2Fe11.44Si1.56Hy合金的居里温度在283~316 K之间可调…
Application of analytic tools for materials selection
The objective of this thesis is the targeted design of new wear resistant materials through the development of analytic frameworks. The building of databases on wear data, whether through calculation or experiment, is a very time-consuming problem with high levels of data uncertainty. For these reasons of small data s…
对叔丁基杯[6]甲酯芳烃萃取Sr^2＋的特性研究
根据高放废液中Sr^2＋的萃取分离需求,合成了对叔丁基杯[6]甲酯芳烃（Calix SMO）,并利用FT-IR、1H-NMR和MS表征确认了其化学结构。选择CH2Cl2作为Calix SMO的稀释剂,当体系初始HNO3浓度为3 mol·L^-1时,在298 K下,萃取时间120 min,对Sr^2＋的萃取率为60%;通过计算,有机相中Calix SMO与Sr^2＋包合比为1：2。分别研究对K^＋、Sb^3＋、Ca^2＋、Sm^3＋、Sn^4＋、Na^＋的萃取,表明Calix SMO对Sr^2＋有良好的选择性。
PEI-b-PLA/Fe_3O_4磁性复合微球的制备及其性能表征
分别采用化学共沉淀法和开环聚合法合成了Fe3O4纳米粒子和星状聚合物PEI-b-PLA,然后采用自组装的方法合成了磁性复合微球PEI-b-PLA/Fe3O4。扫描电镜分析表明磁性复微球的粒径约为10nm,粒径大小主要取决于Fe3O4纳米粒子的粒径。热性能分析表明,PEI-b-PLA/Fe3O4复合微球的聚合物含量为6.6%。产物中Fe3O4含量较高。磁性能分析和紫外分析表明,磁性复合微球PEI-b-PLA/Fe3O4和聚合物PEI-b-PLA一样,可以包裹客体分子,同时具有超顺磁性。