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Polymers beyond standard optical fibres – fabrication of microstructured polymer optical fibres 下载免费PDF全文
Eneko Arrospide Gaizka Durana Mikel Azkune Gotzon Aldabaldetreku Iñaki Bikandi Leire Ruiz‐Rubio Joseba Zubia 《Polymer International》2018,67(9):1155-1163
This paper reports the overall fabrication process of microstructured polymer optical fibres (mPOFs). mPOF fabrication involves a two‐step process: on the one hand, the design and creation of a preform containing a large‐scale version of the desired fibre and, on the other, the precise heating and drawing of the preform to the final fibre. The preforms are produced either by an improved drilling technique or by capillary stacking. For a correct and accurate drawing of the fibre, a controlled and precise heating unit has to be designed, an issue that will be explained in detail in this work. The quality and optical performance of the final mPOF depends strongly on key factors such as the preform annealing, the accuracy of the technique selected for the creation of the preform structure, the heating stage, as well as on the drawing parameters. All of them are analysed in detail and some drawn mPOFs of interest are reported as well. © 2018 Society of Chemical Industry 相似文献
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Eneko Arrospide Gaizka Durana Mikel Azkune Gotzon Aldabaldetreku Iñaki Bikandi Leire Ruiz‐Rubio Joseba Zubia 《Polymer International》2018,67(9):i-i
The cover image, by Eneko Arrospide et al., is based on the Review Polymers beyond standard optical fibres ‐ fabrication of microstructured polymer optical fibres, DOI: 10.1002/pi.5602 .
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The dichotomy between hormone recognition by the ectodomain and activation of the G protein by the rhodopsin-like serpentine portion is a well established property of glycoprotein hormone receptors. The specificity barrier avoiding promiscuous activation of the FSH receptor by the high concentration of human chorionic gonadotropin (hCG) prevailing during human pregnancy was thus believed to lie in the ectodomain. In the past two years, mutations responsible for rare spontaneous cases of ovarian hyperstimulation syndromes have partially modified this simple view. Five naturally occurring mutations have been identified which cause an increase in the sensitivity of the FSH receptor to hCG. Surprisingly, these mutations are all located in the serpentine portion of the receptor. In addition to their effect on sensitivity to hCG, they increase sensitivity of the FSH receptor to TSH, and are responsible for activating the receptor constitutively. Together, the available information indicates that the ectodomain and the serpentine domain of the FSH receptor each contribute to the specificity barrier preventing its spurious activation by hCG. While the former is responsible for establishment of binding specificity, the latter introduces a novel notion of functional specificity.Recent data demonstrate that LH and FSH receptors can constitute functional homo- and heterodimers. This suggests the possibility that in cells co-expressing the two receptors, such as granulosa cells, the heterodimers might be endowed with functional characteristics different from those of each homodimer. 相似文献
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Susana Ferreiro Basilio Sierra Itziar Irigoien Eneko Gorritxategi 《Journal of Intelligent Manufacturing》2012,23(5):1463-1475
One of the most important processes in the aeronautical sector is drilling. The main problem associated with drilling is burr. There is a tolerance level for this burr and it cannot exceed 127 microns, which would provoke structural damage and other problems. Currently, the burr elimination task is carried out visually and manually with the aim of guaranteeing quality in the process. However, it is an expensive procedure and needs to be replaced by a motorized system capable of automatically detecting in which holes the burr exceeds the permitted level and has to be eliminated or reduced. The paper presents a burr prediction model for high speed drilling in dry conditions on aluminium (Al 7075-T6), based on a Bayesian network learned from a set of experiments based on parameters taken from the internal signal of the machine and parameters from the condition process. The paper shows the efficiency and validity of the model in the prediction of the apparition of burr during the drilling and compares the results with other data-mining techniques. 相似文献
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A series of new poly(1-vinyl-3-alkylimidazolium) iodide polymers with different alkyl derivatives such as methyl, propyl and perflurodecyl have been synthesized. The alkyl substituent influenced some properties such as solubility, thermal stability, glass transition and crystallinity of the polymers. For instance, polymer having the propyl substituent was soluble in solvents of intermediate polarity such as acetonitrile, chloroform and THF, the one with the methyl substituent was only soluble in very polar solvents such as water and methanol and the fluorinated polymer was only soluble in DMF. The alkyl substituent also influenced the thermal stability in the order methyl > propyl > perflurodecyl and all the polymers thermally decomposed between 250 and 400 °C in nitrogen. The poly(1-vinyl-3-alkyl-imidazolium) iodide polymers having propyl and methyl substituents were amorphous polymers showing a glass transition temperature of 43 and 21 °C, respectively; and perflurodecyl polymers were semi-crystalline with a Tm at 153 °C and a Tg at 20 °C, as indicated by differential scanning calorimetry.Polymer electrolytes were formulated as mixtures of the ionic liquid 1-methyl-3-propylimidazolium iodide and the poly(1-vinyl-3-alkylimidazolium) iodide polymers. These polymer electrolytes showed ionic conductivities in the range of 10−3 to 10−7 S/cm at room temperature which strongly depended on the ionic liquid content. Finally, poly(1-vinyl-3-propyl-imidazolium) iodide was used to obtain gel electrolytes by adding it to a typical acetonitrile electrolyte used in dye sensitized solar cells (DSSCs). Solar cells with 1 cm2 area prepared using the polymer gel electrolyte yielded a maximum light-to-electricity conversion efficiency of 3.73%. 相似文献
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Joseba Mendiguren Nuria Herrero-Dorca Eneko Saenz de Argandoña Lander Galdos 《International Journal of Material Forming》2018,11(5):663-670
The increase in strength of new high strength steels (HHS) and advanced high strength steels (AHHS) has led to forming issues, such as high springback, low formability, increase of forming forces and tool wear. These problems increase thecosts of manufacturing and maintaining stamping tools in the automotive industry. The aim of this research was to analyse the advantages of applying the press- hardening process toconventional HSS and AHSS steel to increase their formability and therefore reduce the number of forming steps and productioncosts. With this aim in mind, the press-hardening process was used to manufacture an industrialcomponent using four different automotive steel grades: dual phase (DP),complex phase (CP), transformation- induced plasticity (TRIP) and martensitic (MS) grade. Springback measurements werecarried out, together with an analysis of the obtained final mechanical properties and microstructures. The results showed that the formability of all the materials increased. The mechanical properties of theCP800 and TRIP700 materials were maintained or even improved, whereas those of the MS1200 and HCT980X materials were significantly reduced. Weconclude that press hardening is a suitable manufacturing process forCP800 and TRIP700components. 相似文献
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Elisabete Pociello Eneko Agirre Izaskun Aldezabal 《Language Resources and Evaluation》2011,45(2):121-142
Semantic interpretation of language requires extensive and rich lexical knowledge bases (LKB). The Basque WordNet is a LKB
based on WordNet and its multilingual counterparts EuroWordNet and the Multilingual Central Repository. This paper reviews
the theoretical and practical aspects of the Basque WordNet lexical knowledge base, as well as the steps and methodology followed
in its construction. Our methodology is based on the joint development of wordnets and annotated corpora. The Basque WordNet
contains 32,456 synsets and 26,565 lemmas, and is complemented by a hand-tagged corpus comprising 59,968 annotations. 相似文献
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Microwave‐Assisted Preparation of Hydrogel‐Forming Microneedle Arrays for Transdermal Drug Delivery Applications 下载免费PDF全文
Eneko Larrañeta Rebecca E. M. Lutton Aaron J. Brady Eva M. Vicente‐Pérez A. David Woolfson Raghu Raj Singh Thakur Ryan F. Donnelly 《大分子材料与工程》2015,300(6):586-595