Papers by Keyword: Fiber

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Authors: P.E. Mijnarends, C.V. Falub, S.W.H. Eijt, A. van Veen
Authors: Zhi Ming Wang, Xia Zhan
Abstract: For Fiber-Grating Perimeter-Intrusion alarm system, a Fiber-Grating intelligent adaptive alarm algorithm based on wavelet analysis and difference algorithm was proposed. The algorithm precedes the real-time waveform by wavelets decomposition, and acquired the assertion values of each subband by difference calculation. Through the method of comparing the assertion value of some subband, intelligent adaptive alarm system was realized. The experiments indicate that the proposed algorithm can give an alarm for illegal intrusion with good performance and false alarm below 1.5%, and it provides a promising application prospect for intelligent adaptive alarm.
Authors: Chen Song Dong, Tuong Yung Tang
Abstract: A new empirical model for predicting the permeability of fiber mats is presented in this paper. Permeability data were collected from the NIST reinforcement permeability database and categorized according to the material architecture. It is seen from the data that for each category, permeability is proportional to fiber volume fraction. In order to describe the behavior of permeability vs. fiber volume fraction, the location, scale and shape parameters were introduced for each material category. The model was validated against the experimental data and good agreement was found.
Authors: Samuel Bernard, Markus Weinmann, David Cornu, Philippe Miele
Abstract: Boron-modified polyvinylsilazanes have been studied for suitability as fiber precursor. A melt-tractable polymer displaying Si- and N-bonded methyl groups was successfully processed into green fibers ~18μm in diameter via a melt-spinning process. After the shaping process, the use of an ammonia curing atmosphere at 200°C allowed to increase the ceramic yield of the polymer, then avoid inter-fiber fusion during the further increase of the temperature. As-cured fibers were annealed in the temperature range 1000-1800°C in a nitrogen atmosphere to provide SiBCN ceramic fibers black colored, of flexible form and ~12μm in diameter in different crystallinity states going from totally amorphous below 1600°C to well-crystallized at 1800°C. The excellent strength retention after heat-treatment at 1600°C (1.3-1.5GPa) is clearly related to the high amorphous stability of fibers. Elemental compositions of such amorphous fibers showed a typical chemical formula of Si3.0B1.0C5.0N2.4. Between 1600°C and 1700°C, the fiber strength decreased to 0.9GPa then dropped to about one-quarter the original value at 1800°C while structural changes were evident by XRD analysis.
Authors: Ying Na Zhao, Shui Jing Gao, Gui Qin Hou, Wen Li Zhang
Abstract: The joining materials of density ceramics and woven fibres would be potential value as sealing parts for thermal protection system application in aerospace field. Based on ZrO2-Al2O3-SiO2 phase diagram, the ceramics matrix and interlayer compositions were designed. Using the absorber-microwaves properties of Al-Si alloy, the joining of ZTM ceramics and fibre materials with interlayer was achieved by microwave hybrid heating method. The experiment results indicated that the interlayer ingredients were mullite, zirconia and alumina after microwave sintering. The strength of joint specimens was related with the interlayer compositions and the specimen preserved elasticity property according to the test result of universal testing machine. The joint mechanism of interlayer by microwave sintering was discussed in this paper.
Authors: Qiang Zou, Wen Tao Liu, Zhe Zhu, Jian Guo Ma
Abstract: A novel combination of optical fibers and one dimensional (1-D) ZnO nanobelts is presented. Three samples were produced in different heat treatment (300°C and 600°C). A new model was introduced to study silica optical fibers. It was found that the green photoluminescence (PL) of samples is obvious but shows some changes in respective atmosphere. Different buffer layers of polyvinly alcohol (PVA) and ZnO thin film are main factors leading to the differences in PL spectrum. These results support that the novel optical fibers obtained by 1-D ZnO nano-material are available and may lead us another road to self-luminous optical fibers.
Authors: Nuraishah Bazilah Affandi, Azmin Shakrine Mohd. Rafie, Shahnor Basri, Fairuz Izzuddin Romli, Dayang Laila Abang Abdul Majid, Faizal Mustapha
Abstract: Known as “coir”, the fibrous husk of the coconut fruit has potential for integration as a constituent in impact-resisting aerospace materials. As a preliminary study, kinetic energy absorption of this natural fiber is studied prior to further testing, for instance; a non-ballistic surface impacted at high velocity by a small mass is the equivalent mock-up to runway debris. The purpose of this study is to find the relationship between the thickness of the fiber with the kinetic energy absorption. Fabricated fiber panels measuring 10×10×t cm with various thickness are subjected to mild steel projectiles launched by a light gas gun at a constant pressure. The velocity of the projectiles is set to be consistent with the velocity range of typical transport-category aircraft. The impact response of the panels aids in predicting the required amendments where plies of coir sheets are increased to which perforation is impossible. The relationship established from the experimental results is then used to predict the amount of layers required for total translational kinetic energy absorption.
Authors: Ki Seok Kwon, Heung Youl Kim, Seung Un Chae, Bum Yean Cho
Abstract: More high-rise structures are currently being constructed and correspondingly, the compressive strength of concrete has been increased. However, compared to conventional strength concrete the high strength concrete (HSC) exhibits coarse inner pore structure which blocks escape routes of vapour generated in the event of fire. This results in spalling and subsequently, are responsible for fire vulnerability of the structure. In addition, spalling phenomena is also affected by the section dimensions of HSC which is also another crucial factor from socio-economic considerations. Thus, this study was carried out to evaluate the fire resistance performance of hybrid fiber (i.e. steel-polypropylene-fibre)-reinforced HSC columns with different cross-section dimensions. The result of the fire resistance performance testing using 100MPa concrete showed that delay to failure was observed by approximately 76 per cent.
Authors: Yi Min Sang
Abstract: The morphology, interspace of a novel nanofiber membrane are characterized by scanning electron microscopy (SEM). The membrane, named M-1, is prepared from chloridized polyvinyl chloride by high-voltage electrospinning process. The removals of divalent metal cations including Cu2+, Pb2+ and Cd2+ from the simulated groundwater by M-1 have been investigated. From static adsorption experiments, maximum uptakes of Cu2+, Cd2+, Pb2+ and their adsorption equilibrium time have been obtained respectively in the simulated groundwater.
Authors: Xiao Chun Li, Ji Liang Cao
Abstract: The soybean/casein/polyvinyl alcohol blend fiber was treated in sodium carbonate solutions to evaluate its alkali resistance which was very important for wet processing. The weight loss and whiteness of the treated fibers were examined. UV spectra of the alkaline treatment solutions were analyzed. The study showed that the fiber exhibited poor alkali resistance. Treating temperature, time and alkali concentration affected the weight loss of the treated fibers. A high weight loss was found even at low alkali concentration. The weight loss was primarily due to the hydrolysis of casein.
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