摘要:
An apparatus for controllably heating material, such as a material to be analyzed for volatiles or non-volatiles contents, directly and indirectly by microwave radiation, includes a chamber, in which the material to be heated is placed, a source of microwave radiation, for radiating onto materials in the chamber and for controllably heating such a material, and a support for such material, which support includes a matrix of a material which transmits microwave radiation, and also includes particulate material therein which absorbs microwave radiation. The absorptive material is one that has a Curie temperature, above which it is transmissive of microwave radiation, so as thereby to prevent excessive heating of the support and the supported material which is to be heated. The matrix material is stable and form-retaining at the Curie temperature of the dispersed material. Preferably the support matrix will be of a silicone rubber or of a polyfluoroalkylene polymer, such as polytetrafluoroethylene, and the dispersed material will be a ferrite, garnet or a mixture thereof. The apparatus may include a turntable for one or more supports, an automatic electronic balance, computerized controls and readout means. Also within the invention are the described support, and processes for heating and drying, in a preferred embodiment of which processes a particulate diluent or dispersant for the sample being treated is employed to prevent overheating of the sample.
摘要:
Apparatuses and processes are described for the automatic determinations of fat contents of foods, such as dairy products, e.g., milk, wherein automatic density and solids content determining apparatuses are employed, together with a computer, to determine the fat contents of food samples being tested. The density determining apparatus is preferably one which is electromagnetically excited to vibrate at its natural resonant frequency, so that from the change in such frequency, compared to a control, the mass of the sample may be determined. The means for measuring the solids content is preferably an automatic volatility computer in which electromagnetic radiation (microwave energy) is employed to drive off the volatile material (usually mostly water) in the sample, which is automatically weighed before and after such volatilization. Preferably, a microcomputer in the automatic volatility computer is employed to compute fat content from electronic feeds to it from the density and the solids content determining apparatuses.
摘要:
A method and apparatus is described for improving the weighing accuracy of sensitive automatic balances when weighing heated substances. This is accomplished by substantially eliminating or reducing convection currents from interfering with and fluctuating the weight being sensed. An air barrier shield is used to cover the balance plate without contacting or touching the balance, thereby eliminating convection air currents from interfering with the movement of the balance. The air barrier is permeable to microwave radiation and capable of absorbing moisture and other volitilized substances while being substantially impermeable to air currents. Glass fiber matting or padding is particularly useful for forming the air barrier enclosure. The invention is particularly applicable to analytical determinations which require microwave heating of the substance to remove volatiles and the requirement to accurately and sensitively weigh the substances while still hot using an electrical balance.
摘要:
A contact lens having one or more fiducial marks that allow the measurement of lens rotation and centration. The lens may be a trial lens. The lenses can be used to apply correction factors for sphero-cylindrical refractive error, higher order aberrations, and corneal topography.
摘要:
Disclosed are methods, and associated systems comprising processors, input devices and output devices, of detecting regions of interest in a tomographic breast image. The methods may comprise: acquiring tomographic breast image data; deriving a plurality of synthetic sub-volumes from the tomographic breast image data; wherein each subvolume is defined by parallel planar top and bottom surfaces; wherein planar top and bottom surfaces of successive subvolumes are parallel to each other; and wherein a top planar surface of a sub-volume is offset from a top planar surface of a prior sub-volume, such that successive sub-volumes overlap; for each sub-volume, deriving a two-dimensional image; for each two-dimensional image, identifying regions of interest therein; deriving at least one region of interest of potential clinical interest from a plurality of identified regions of interest; and outputting information associated with at least one derived region of interest of potential clinical interest.
摘要:
Methods and systems are presented that improve a radiologist's ability to identify polyps by automatically and more accurately detecting and displaying colonic residue such as tagged or untagged stool or colonic fluid in medical images of the colorectal region. A virtual colonography imaging system obtains medical imagery of the colon. Improved computer-aided detection (CAD) algorithms identify colonic residue in the imagery by calculating feature vectors of and using statistical classification methods to classify regions of colonic residue to distinguish them from false positives.
摘要:
The invention provides methods for designing ophthalmic lenses, and lenses produced by this method, which lenses corrects both low order and high order wavefront aberrations of the lens wearer's eyes.
摘要:
A contact lens having one or more fiducial marks that allow the measurement of lens rotation and centration. The lens may be a trial lens. The lenses can be used to apply correction factors for sphero-cylindrical refractive error, higher order aberrations, and corneal topography.
摘要:
Systems, computer-readable media, and methods are presented that identify suspicious anomalies in a colon with higher sensitivity and at a lower false positive rate. A plurality of images of an anatomical colon is acquired. Candidate suspicious anomalies are identified in each image. The candidate suspicious anomalies across images are then compared using registration and matching. Features of candidate suspicious anomalies across images may be jointly evaluated to perform classification.