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101.
Geysen D Kanobana K Victor B Rodriguez-Hidalgo R De Borchgrave J Brandt J Dorny P 《Journal of food protection》2007,70(1):236-240
Bovine cysticercosis is a zoonosis caused by the larval stage (cysticercus) of the human tapeworm Taenia saginata. Infected cattle is an important food safety issue besides an economic concern. Humans get infected by eating raw or undercooked meat containing viable cysticerci. Visual meat inspection of bovines is the only public health measure implemented to control transmission to humans, but it lacks sensitivity and objectivity. It may underestimate the prevalence of the disease by a factor 3 to 10. Furthermore, the success of the method depends on the expertise of the meat inspector as well as on the stage of development of the cysticerci. The focus of this study was to develop and explore the usefulness of a PCR assay as an objective alternative to evaluate the meat inspector's visual inspection results. Hereto, a PCR was developed for the detection of T. saginata DNA in muscle lesions. Based on the laboratory classification of lesions, almost 97% of viable cysts were confirmed by PCR, while for dead cysts, the percentage was approximately 73%. Taken together, these data demonstrate the difficulties of visual meat inspection and their objective interpretation, emphasizing the need to improve current assays to strengthen the control of bovine cysticercosis. 相似文献
102.
Tom Lauwagie Konstantina Lambrinou Sophoclis Patsias Ward Heylen Jef Vleugels 《NDT & E International》2008,41(2):88-97
This work introduces a resonant-based, mixed numerical–experimental method for the determination of the in-plane elastic properties of the constituent materials of laminates. This non-destructive method identifies elastic properties from the resonant frequencies of beam-shaped layered specimens, using a set of finite element models. The method is demonstrated on a thermal barrier coating system made of NiCoCrAlY bondcoat and yttria-stabilised zirconia topcoat deposited by air-plasma spraying on stainless steel. The stainless steel was found to be elastically anisotropic, while both bondcoat and topcoat exhibited in-plane isotropy. Moreover, the topcoat Poisson's ratio approached zero, and the bondcoat properties varied with the coating thickness. Scanning electron microscopy was used to correlate the identified elastic properties with the coating microstructure. 相似文献
103.
J. van der Heide N.E. Posthuma G. Flamand W. Geens J. Poortmans 《Solar Energy Materials & Solar Cells》2009,93(10):1810-1816
This paper describes the realisation of cost-efficient thermophotovoltaic (TPV) cells based on germanium substrates. Because the majority of the photons incident on the TPV cell in a typical TPV system will have a long wavelength it is important to apply optical confinement in the TPV cell. In this paper this has been done by using a highly reflective rear contact. Electrical contact at the rear has been created with a laser (laser fired contact, LFC) such that the metal is locally heated and contact is formed.The optimal TPV cell is based on a low doped p-type germanium substrate having a 500 nm thick n-type emitter , where front and rear are both passivated with hydrogen rich PECVD amorphous silicon. An AM1.5G record efficiency has been measured for a germanium TPV cell with an LFC rear contact. The application of optical confinement leads to a clear improvement of the spectral response in the wavelength region which is dominant in TPV systems and results in a potential 20% increase of current density compared to the use of a classical germanium photovoltaic cell. 相似文献
104.
Multicrystalline silicon solar cells with porous silicon emitter 总被引:3,自引:0,他引:3
R. R. Bilyalov R. Lüdemann W. Wettling L. Stalmans J. Poortmans J. Nijs L. Schirone G. Sotgiu S. Strehlke C. Lvy-Clment 《Solar Energy Materials & Solar Cells》2000,60(4):391-420
A review of the application of porous silicon (PS) in multicrystalline silicon solar cell processes is given. The different PS formation processes, structural and optical properties of PS are discussed from the viewpoint of photovoltaics. Special attention is given to the use of PS as an antireflection coating in simplified processing schemes and for simple selective emitter processes as well as to its light trapping and surface passivating capabilities. The optimization of a PS selective emitter formation results in a 14.1% efficiency mc-Si cell processed without texturization, surface passivation or additional ARC deposition. The implementation of a PS selective emitter into an industrially compatible screenprinted solar cell process is made by both the chemical and electrochemical method of PS formation. Different kinds of multicrystalline silicon materials and solar cell processes are used. An efficiency of 13.2% is achieved on a 25 cm2 mc-Si solar cell using the electrochemical technique while the efficiencies in between 12% and 13% are reached for very large (100–164 cm2) commercial mc-Si cells with a PS emitter formed by chemical method. 相似文献
105.
Sebastian Meyers Lien De Leersnijder Jef Vleugels Jean-Pierre Kruth 《Journal of the European Ceramic Society》2018,38(11):3709-3717
Additive manufacturing (AM) techniques are promising manufacturing methods for the production of complex parts in small series. In this work, laser sintering (LS) was used to fabricate reaction bonded silicon carbide (RBSC) parts. First, silicon carbide (SiC) and silicon (Si) powders were mixed in order to obtain a homogeneous powder. This powder mixture was subsequently laser sintered, where the Si melts and re-solidifies to bind the primary SiC particles. Afterwards, these SiSiC preforms were impregnated with a phenolic resin. This phenolic resin was pyrolysed yielding porous carbon, which was transformed into secondary reaction formed SiC when the preforms were infiltrated with molten silicon in the final step. This resulted in fully dense RBSC parts with up to 84?vol% SiC. The optimized SiSiC combined a Vickers hardness of 2045?HV, an electrical conductivity of 5.3?×?103?S/m, a Young's modulus of 285?GPa and a 4-point bending strength of 162?MPa. 相似文献
106.
Miquel Turon-Vinas Fei Zhang Jef Vleugels Marc Anglada 《Journal of the European Ceramic Society》2018,38(6):2621-2631
Ceria-stabilized zirconia ceramics are characterised by excellent hydrothermal stability and high fracture toughness, but the fracture strength and hardness are lower than that of conventional 3Y-TZP, which is sensitive to low temperature degradation in humid environments. In the present work, the influence of small concentrations of calcia on the microstructure, mechanical properties and hydrothermal ageing resistance of 10 and 12?mol% CeO2 stabilised ZrO2 has been assessed. The addition of only 1?mol% of CaO had a strong refining effect on the microstructure resulting in an increased hardness and strength but reduced stress activated tetragonal-to-monoclinic transformability. The addition of 3?mol% CaO however enhanced the transformability with respect to 1?mol% CaO and preserved the high resistance to hydrothermal degradation of Ce-TZP. 相似文献
107.
Guojie Wang Dr. Georgii V. Bobkov Sergey N. Mikhailov Prof. Guy Schepers Arthur Van Aerschot Prof. Jef Rozenski Prof. Mark Van der Auweraer Prof. Piet Herdewijn Prof. Steven De Feyter Prof. 《Chembiochem : a European journal of chemical biology》2009,10(7):1175-1185
Powerful pyrene probes : Two kinds of pyrene‐labeled oligonucleotides (HNA‐ and RNA‐skeleton probes) were explored. The enhanced fluorescence intensity in the monomer region and the disappearance of aggregate/excimer emission in duplexes has been successfully used to detect the hybridization of oligonucleotides.
108.
Lennart Yseboodt Michael De Nil Jos Huisken Mladen Berekovic Qin Zhao Frank Bouwens Jos Hulzink Jef Van Meerbergen 《Journal of Signal Processing Systems》2009,57(1):107-119
Wireless sensor nodes span a wide range of applications. This paper focuses on the biomedical area, more specifically on healthcare
monitoring applications. Power dissipation is the dominant design constraint in this domain. This paper shows the different
steps to develop a digital signal processing architecture for a single channel electrocardiogram application, which is used
as an application example. The target power consumption is 100 μW as that is the power energy scavengers can deliver. We follow
a bottleneck-driven approach: first the algorithm is tuned to the target processor, then coarse grained clock-gating is applied,
next the static as well as the dynamic dissipation of the digital processor is reduced by tuning the core to the target domain.
The impact of each step is quantified. A solution of 11 μW is possible for both radio and DSP running the electrocardiogram
algorithm.
相似文献
Jef Van MeerbergenEmail: |
109.
A powder metallurgy (PM) process to fabricate alumina parts through indirect selective laser sintering (SLS) of spherical alumina-polyamide composite powder is presented. The PM process includes powder production, SLS, debinding and furnace sintering. Three different strategies are investigated in order to improve the density of the final alumina parts: laser remelting, warm isostatic pressing (WIP), and different infiltration techniques which use alumina containing suspensions: pressureless infiltration and infiltration under pressure (i.e. squeeze infiltration). Furthermore, microstructural and geometrical changes which occur during the PM process are investigated. 相似文献
110.
Hans Gommans Bregt Verreet Barry P. Rand Robert Muller Jef Poortmans Paul Heremans Jan Genoe 《Advanced functional materials》2008,18(22):3686-3691
The effect of bathocuproine (BCP) on the optical and electrical properties of organic planar heterojunction photovoltaic cells is quantified by current–voltage characterization under 1 sun AM 1.5D simulated solar illumination and spectral response at short‐circuit conditions. By inserting a 10 nm BCP layer in an indium tin oxide (ITO)/subphthalocyanine (SubPc)/buckminsterfullerene (C60)/BCP/Al thin‐film structure, an increase in power‐conversion efficiency from 0.05 to 3.0% is observed, mostly reflected in the enhanced open‐circuit voltage up to 920 mV. Furthermore, the incorporation of a 10‐nm BCP layer in an ITO/C60/BCP/Al structure leads to an increase in built‐in potential from 250 to 850 mV, as demonstrated by electroabsorption. It is argued that BCP passivates C60 such that a 10‐nm layer provides a sufficient buffer layer that prohibits Al contacting the C60 where it would otherwise create donor states. 相似文献