摘要:
A vehicle tire having a profiled tread on the periphery of which are arranged pitches of at least two different lengths. In an axial direction, the tread is divided into several parts, with the successive pitch length in a given axial part forming a pitch sequence. To further reduce radial force fluctuations that induce vibrations by the transmission of noise into wheel suspension and body parts, the phase offset between the pitch sequences of the various tread parts is dimensioned such that the distance between the absolute extremes of the summation of weighted representations of a given function is minimal or at most 25% greater than this minimum. Each of the tread parts have associated therewith a function that is the successive plotting of successive pitch lengths of the pertaining tread part on the abscissa while marking off the respective pitch length, starting from the abscissa, onto the ordinate. From each of these functions a "representation" is determined that is what remains after elimination of all harmonic parts of greater than the x order, with "x" being an integer between 8 and 14. To determine this remainder, the function is first harmonically analyzed from the first to the x order, and from this information, including the phase information, the representation is generated by synthesis.
摘要:
A device for reducing certain sound ranges of tire/road surface noise of a motor vehicle includes sound absorbers in the form of resonators positioned at the inner wall of a wheel well of the vehicle in the area of sound projection of the tire/road surface noise. The device has an electronic control device for receiving a signal preferably derived from an ABS system in the form of the wheel rpm. The control device adjusts the resonators according to the number of tread blocks of the tire, the sound emission characteristics, and the wheel rpm. In another embodiment the electronic control device is supplied with signals received from a sound receiver that records the course over time of the sound pressure. The control device adjusts the resonators such that the measured sound pressure signal is minimized. In another alternative the device has a data processing unit including an electronic control device. The control device is supplied with a signal from sound receiving devices that record the course over time of the sound pressure. The data processing unit together with an adjusting device adjusts the resonators such that the measured sound pressure signal for selected frequency ranges is minimized.
摘要:
A noise shaper for shaping a power spectral density of an input signal which consists of signal intervals, wherein each signal interval has a corresponding signal amplitude being constant for a variable interval duration time of the signal interval, said noise shaper comprising a calculation unit having at least one serial connected integrator wherein each integrator calculates an integrated signal of different order from said input signal, and a weighting unit for weighting each integrated signal with a corresponding adjustable weighting coefficient according to a noise transfer function.
摘要:
The invention relates to a method for producing shaped bodies, especially threads or foils, from at least one polymer of the groups consisting of polysaccharide, polysaccharide derivative or polyvinyl alcohol by forming a solution of the polymer that contains an additive in a solvent containing amine-N-oxide, extruding the solution and precipitating the extrudate by contacting with a coagulant. The invention is characterized in that at least two polymeric solutions are formed. At least one of the two polymeric solutions contains one or more finely distributed additives and the at least two polymeric solutions are simultaneously extruded forming a combined extrudate.
摘要:
A capacitive-coupled parallel plate plasma enhanced chemical vapor deposition reactor includes a gas distribution unit that is integrated in an RF electrode and is formed with a gas outlet. The parallel plate reactor is configured so that layers with high thickness homogeneity and quality can be produced. The capacitively coupled parallel plate plasma enhanced vapor deposition reactor has gas distribution unit with a multiple-stage showerhead constructed in such a way that it provides an independent adjustment of gas distribution and gas emission profile of the gas distribution unit.
摘要:
A semiconductor device disclosed herein includes a conductive connection structure having a stepped profile that serves as a stress relief feature. The conductive connection structure includes a stress buffer arrangement for a contact pad. The stress buffer arrangement has a stepped via that terminates at the contact pad, and the stepped via has a plurality of inwardly sloped and concentric sections in a stacked orientation. The connection structure also includes underbump metallization overlying at least a portion of the contact pad and lining the stepped via, and a conductive connection element coupled to the underbump metallization. The conductive connection element fills the lined recess.
摘要:
An arrangement and method for positioning an ophthalmologic device with respect to the patient's eye to be examined in x-, y- and/or z-coordinates. The device includes a controllable illumination unit, an observation system, an image recording unit, a central control unit, an output unit, an eye tracker unit, and a device for relative positioning. The imaging system of the eye tracker unit has at least two different adjustable magnifications. In positioning the ophthalmologic device, the signal of the eye tracker unit is used to track a measuring mark and/or grid structure projected on the eye, and also to detect the position of the patient's eye with respect to the optical axis of the ophthalmologic device. The inventive solution makes it possible to automatically position the entire device with respect to the eye to be examined, thus simplifying examination and accelerating determination of biometric data.
摘要:
The invention provides an apparatus and a method for performing a calculation operation with at least one input signal consisting of signal sections, wherein each signal section of said input signal has a constant amplitude. The apparatus comprises a signal transformation unit for transforming at least one input signal into a first intermediary signal having a virtual amplitude with respect to at least one carrier signal. The calculation unit is provided for performing the calculation operation on said first intermediary signal to generate a second intermediary signal. A signal re-transformation unit re-transforms the second intermediary signal into an output signal consisting of signal sections, wherein each signal section of said output signal has a constant amplitude.
摘要:
The present invention is directed to an arrangement and method for positioning the device with respect to the patient's eye to be examined in x-, y- and/or z-coordinates. The ophthalmologic device comprises a controllable illumination unit, an observation system, an image recording unit, a central control unit, an output unit, an eye tracker unit, and means for relative positioning. The imaging system of the eye tracker unit has at least two different adjustable magnifications. In the method for positioning the ophthalmologic device, the signal of the eye tracker unit is used not only to track a measuring mark and/or grid structure projected on the eye but also to detect the position of the patient's eye with respect to the optical axis of the ophthalmologic device. The solution proposed with the ophthalmologic device according to the invention makes it possible to automatically position the entire device with respect to the eye to be examined. The examination and determination of the biometric data of an eye can be simplified and substantially accelerated in this way.
摘要:
A process is described for the preparation of cellulose derivatives containing amino groups that involves reacting, in the presents of water as a reaction medium, alkali cellulose or alkali cellulose derivatives with reagents represented by the following formula, X—(CH2)n—NR1R2 in which: X is selected from the group consisting of chlorine, bromine, iodine and a sulfonic acid radical R′SO3, in which R′ is an aromatic radical or an aliphatic radical; n is at least 2; and R1 and R2 independently of each other are selected from the group consisting of aliphatic substituents, branched alkyl substituents, cyclic alkyl substituents, aryl substituents, aryl substituents substituted by heteroatoms, H, and R1 and R2 together form a ring with the nitrogen. In the process, the mole ratio of cellulose to water, of said reaction medium, is 1:5 to 1:40 mol water per mol of anhydroglucose unit (AGU). Amino functional cellulose derivatives prepared in accordance with the method of the present invention are useful in cosmetic formulations and aqueous paper treatment compositions.
摘要翻译:描述了制备含有氨基的纤维素衍生物的方法,该方法包括在作为反应介质的水的存在下,将碱纤维素或碱性纤维素衍生物与下式表示的试剂反应:<?在线配方说明= “In-line Formulas”end =“lead”?> X-(CH 2)n - NR 1 R 2 - 其中:X选自氯,溴,碘和磺酸基R'SO 2,其中:X选自氯,溴,碘,磺酸根R' 其中R'是芳族基团或脂族基团; n至少为2; R 1和R 2彼此独立地选自脂族取代基,支链烷基取代基,环烷基取代基,芳基取代基,被杂原子取代的芳基取代基 ,H和R 1和R 2一起与氮一起形成环。 在该过程中,所述反应介质的纤维素与水的摩尔比为每摩尔脱水葡萄糖单元(AGU)为1:5至1:40摩尔水。 根据本发明的方法制备的氨基官能纤维素衍生物可用于化妆品制剂和水性纸处理组合物中。