摘要:
The present invention relates to an apparatus and a method for optical coherence reflectometry, in particular for optical coherence tomography. The invention particularly relates to the route of the light field in the sample arm. The reflected light field in the sample arm is amplified before being received by a combining means, said combining means being capable of receiving the reflected light field from the sample arm as well as the second reflected light field from the reference arm. Thereby, it is possible to direct substantially all light energy in the sample arm to the combining means, and to obtain fully the utilisation of the amplification of the reflected light field since preferably only the reflected light field is amplified by the optical amplifier. This leads to an improved signal-to-noise ratio (SNR) whereby an increase of the maximal penetration depth is obtained. Thereby, the apparatus is useful for obtaining optical biopsies of transparent as well as non-transparent tissues as well as new technical fields wherein the increased SNR allows the use of the present apparatus.
摘要:
A method and an apparatus are provided for the determination of a condition or state of an object based on quasi-elastic interaction between the object and light transmitted to the object. This light is transmitted from a light source through at least one diffractive optical element. The light that has interacted with the object is collected and detected. The diffractive element incorporates at least one diffraction region, the element defining both the functional principle of the method and the calibration of the method. The functional principle and the calibration are substantially exclusively defined by the diffractive element(s) and substantially independent of the properties of the light source. Several diffraction patterns are integrated in one diffractive optical element, thereby integrating several optical functions, such as lenses, beam splitters, etc. in one optical component. Use: transit-time-velocity measurement, Doppler velocity measurement, viscoelastic determination, differential electronic speckle determination, differential vibrometer, distance determination apparatus, etc.
摘要:
A solid oxide fuel cell includes a cathode, a YSZ-electrolyte, and an anode, where the cathode is formed by a mixture of LSM and YSZ. According to the invention the content in the cathode of YSZ amounts to 20 to 75 % by weight, whereby it is possible to reduce the polarisation resistance to 0,08 Φ cm2 at 40 mV. Furthermore, a mechanically stable structure is obtained.
摘要:
A method for the solid-phase synthesis of peptides or proteins in high yield and high purity uses a solid support consisting of a functionalized polystyrene-grafted polymer substrate, the grafted polystyrene chains being substantially non-cross-linked and having a chain molecular weight, not including optional non-reactive substituents, of at least 200,000, preferably in the range of 600,000-1,200,000. Particularly suitable polymer substrates are substrates of a polyolefin such as polyethylene. The method is particularly well-suited to the compartmentalized synthesis of a multitude of peptides or proteins in a parallel and substantially simultaneous fashion. Preferred embodiments of a solid support for performing the synthesis are prepared from thin polyethylene sheet or film which has been grafted with polystyrene chains in a radical-initiated process in which the polyethylene sheet or film is immersed in a solution of optionally substituted styrene monomer in an alcohol such as methanol, the volume percentage of styrene in the solution preferably being about 30 % v/v, and subjected to gamma irradiation.
摘要:
Méthode pour produire des fibres et/ou des particules désagglomérées et pour donner aux fibres et/ou aux particules un revêtement protecteur pratiquement uniforme, les fibres et/ou les particules étant faites d'un matériau choisi parmi le groupe constitué par les carbures, les oxydes, les nitrures, les siliciures, les borures, les métaux et le graphite, y compris SiC, TiC, ZrC, WC, NbC, AlN, TiN, BN, Si3N4, MgO, Al2O3, SiO2, ZrO2, Fe2O3, Y2O3, l'acier, le tungstène, le molybdène et le carbone. Ce procédé consiste (a) à préparer un sol colloïde inorganique, et (b) à mélanger les fibres et/ou les particules avec le sol colloïde inorganique afin de produire une dispersion dans laquelle les fibres et/ou les particules se désagglomèrent et sont distribuées de manière pratiquement homogène. Les fibres et/ou les particules, par exemple les barbes SiC, pourvues d'un revêtement d'oxyde d'aluminium par traitement avec un sol formé à base d'hydroxyde d'aluminium, sont utilisées pour la fabrication de matériaux métalliques composites à phase dispersée, formés par exemple à base d'aluminium ou d'un alliage d'aluminium.
摘要:
An apparatus and a method used to determine the speed and direction of the wind experienced by a wind turbine are provided. Said apparatus comprises at least one sensor fixed to the rotor of said wind turbine, an angular sensor to measure the angular position of the rotor of said wind turbine, and a circuit which converts the relationship between the output of said at least one sensor and the output of the angular sensor into the speed and direction of the wind experienced by the wind turbine. According to the invention, the sensing apparatus can measure the wind speed and direction in three dimensions. In addition, mounting the sensors directly to the rotor of the wind turbine results in a very simple and robust installation. Mounting the sensors directly to the rotor also eliminates the turbulence from the rotor and the nacelle of the wind turbine from affecting the sensors.
摘要:
The present invention relates to a method of controlling the aerodynamic load of a wind turbine’s blades individually in such a way that the dynamic aerodynamic loads on the turbine are reduced and power production is optimised. In general the present invention will improve the overall stability of the turbine leading to reduce fatigue loads, reduced extreme loads during operation and reduced risk of blade-tower interaction. In particular preferred embodiment of the invention, flow properties are measured locally on the different blades or in front of the blades and from these measurements the pitch angle settings are changed, in other ways changing the aerodynamic properties, for the blades through a control unit.