There is provided an ophthalmic characteristic measuring apparatus in which when a wavefront measurement is carried out, an adjustment of an exposure amount, such as an exposure time or a light amount of a light source, is carried out. A first light source section emits light flux with a first wavelength. A first illumination optical system illuminates a minute area on a retina of a subject eye with the first flux from the first light source. A first light receiving optical system guides a part ...

An electrical machine is coupled to a load which has a torque profile which varies with angle. The machine is coupled so that the torque ripple of the machine is synchronized with the torque ripple of the load in such a manner as to provide an efficient drive system which can start at any angular position. This allows the size of the electrical machine to be reduced to a point where its average torque may be below the peak requirement of the load.

A method determines mobility characteristics of a mobile terminal by measuring a first and second angular direction of travel of the mobile terminal at a first and second instant. The first angular direction is subtracted form the second angular direction to determine the directivity of the mobile terminal during an interval of time between the first instant and the second instant. The directivity, in terms of a mean, variance, or histogram can be used to classify the mobile terminal, and locati...

In a packet based data transmission including automatic repeat request (ARQ) protocols, the memory consumption of the ARQ protocol is reduced by compression/decompression of failed data block prior to combination with the retransmitted data blocks using low complexity compression/decompression algorithms. The compression algorithm includes of two parts: calculating and storing a scale factor that estimates the soft values in the data block, and storing the each soft values' sign in local memory ...

A method of determining thermophysical or thermochemical parameters of a fuel gas is disclosed which has wide application both as to applicable fuels and applicable parameters. A relationship has been discovered that allows the determination of many parameters based on a basic relationship with the characteristic specific heat and thermal conductivity at a reference condition of the fuel gas and the rate of change of these characteristics at the reference conditions.

Method and apparatus for measuring the following lens characteristics: (a) curvature of the front and back surfaces of the lens; (b) physical thickness; and (c) index of refraction of the lens to determine the front vertex power, back vertex power; and the lens material. In particular, an embodiment of one aspect of the present invention for measuring the index of refraction of the glass includes: (a) a source of a substantially spatially coherent beam of radiation and having a short temporal co...

A power conversation apparatus in a computer system. This apparatus includes an identification register in a processor comprising a contents including a plurality of flags for identifying the characteristics of the processor. One of these characteristics may be whether the processor includes static logic devices. In such systems, the clock connected to the processor may be halted, without the corruption of data in the processor. Other characteristics may include whether the processor is clocked ...

Changes in characteristics of an image are monitored at a predetermined position or zone (12, 13) of the image. The image is corrected to allow for changes in the monitored position or zone (12, 13). This is done with reference to observed deviation in coordinates of reference points (9-11) of the image. In a preferred embodiment, successive thermographic images are obtained of electronic equipment, such as a printed circuit board, and the image as displayed on a VDU screen (4) is scanned at a p...

A method of, and apparatus for, assessing a characteristic of a fluid, particularly for assessing the degree of contamination of a fluid by a substance which causes the fluid to become progressively less transparent to radiation with increasing contamination, wherein the fluid is introduced into a chamber, and the attenuation of the radiation by passage through the fluid in the chamber at the different parts therein is examined. The invention is particularly applicable to assessment of contamina...

An apparatus for monitoring characteristics of rock cores using NMR. The apparatus is provided with a clad permanent magnet for generating a magnetic field having a saddle profile. The magnetic field is sufficiently uniform within a working volume to enable an NMR experiment to be performed. Rock cores are conveyed along a path about which the magnet is arranged. The cores pass through the working volume of the magnetic field orthogonally to the saddle profile of the magnetic field. An NMR exper...