摘要:
Approaches for determining the delivery success of a particle, such as a drug particle, are disclosed. A system for monitoring delivery of particles to biological tissue includes a volume, an optical component, a detector, and an analyzer. The volume comprises a space through which a particle can pass in a desired direction. The optical component is configured to provide a measurement light. The detector is positioned to detect light emanating from the particle in response to the measurement light. The detected light is modulated as the particle moves along a detection axis. The detector is configured to generate a time-varying signal in response to the detected light. The analyzer is configured to receive the time-varying signal and determine a delivery success of the particle into a biological tissue based upon characteristics of the time-varying signal.
摘要:
Secure areas, such as at airports or other security-critical facilities, are entered from freely accessible areas, often by means of access locks. This bottleneck, which is present in any case, is used to check for substances of concern, such as drugs or explosive materials. In the case of solids, as is known, particles extracted from the access lock and retained in a screen are vaporized and the vapor is examined. Several of the screens are arranged on rotatable carrying disks and undergo consecutively the steps of vaporization and analysis. The aim of the invention is to make known methods more efficient in order to increase the throughput through such access locks. The aim is achieved by a device for which available heating and extraction elements are assigned to multiple rotational positions of the carrying disks, whereby adjacent rotational positions lie apart from each other by only half the distance of two screens.
摘要:
The method of detecting leukemia involves placing a suspension of red blood cells in a reservoir having a capillary tube partially immersed in the reservoir. An alternating current is applied to electrodes (one in the reservoir, the other in the capillary tube) at different frequencies. The electrical resistance is measured at the interface between the electrode and the suspension in the capillary tube. At the same time, CCD (charge coupled device) cameras take images, both top views and side views. The electrical resistance will show a peak at a characteristic resonant frequency, which is different for cancerous blood cells than for normal blood cells. The CCD images will show a pattern of maximum repulsion from the electrode at the resonant frequency in the top view, and minimum height of blood cells on the side of the electrode at the resonant frequency in the side view.
摘要:
Microspheres are sorted by resonant light pressure effects. An evanescent optical field is generated when light is confined within the interior of an optical element such as a surface waveguide, a tapered microfiber, or a prism. Microspheres brought within vicinity of the surface are subjected to forces that result from a coupling of the evanescent field to whispering gallery modes (WGM) in the microspheres. Alternatively, a focused laser beam is directed close to the edge of the microspheres to exert resonant optical forces on microspheres. Alternatively, standing optical waves are excited in the optical element. Optical forces are resonantly enhanced when light frequencies match WGM frequencies in the microspheres. Those microspheres for which resonance is obtained are more affected by the evanescent field than microspheres for which resonance does not occur. Greater forces are applied to resonating microspheres, which are separated from a heterogeneous mixture according to size.
摘要:
Systems and methods are disclosed to analyze sediment and sedimentary rock properties. Example systems and methods transform data representing physical particles and burial histories into a three-dimensional representation of solids and pores in sediments and sedimentary rocks by analyzing effects of deposition, grain rearrangement, compaction, and chemical reactions. Resulting output may include three-dimensional representations which may be the basis of physical objects or media for laboratory tests. In an example, output may provide a basis for evaluating present-day properties for areas where sample material is unavailable, reconstructing properties for times in the geologic past, and forecasting the effects of engineering and industrial activities on properties.
摘要:
A cell mobility characteristics sensing apparatus including a laser light source, a light sensor, an analyzing chip, and a display is disclosed. The laser light source emits laser beams to a cell sample. The light sensor senses scattered laser beams formed by the cell sample scattering the laser beams at a plurality of time points to obtain a plurality of laser scattering patterns corresponding to the plurality of time points respectively. The analyzing chip obtains a laser scattering pattern fluctuations information of the plurality of laser scattering patterns varied with the plurality of time points to estimate the mobility characteristics of the cells in the cell sample. The display shows the mobility characteristics of the cells in the cell sample estimated by the analyzing chip.
摘要:
The invention relates to methods and apparatus for determining properties of a surface. Embodiments disclosed include an apparatus for measuring a surface charge of a sample, comprising: a sample holder having an opposed pair of electrodes and configured to hold a sample in position in a measurement volume between the electrodes such that a planar surface of the sample is aligned orthogonal to the electrode surfaces; a measurement chamber for containing a measurement liquid and having an open end configured to receive the sample holder to position the electrodes in a preset orientation; a laser light source positioned and configured to direct a laser beam through the measurement chamber between the electrodes and parallel to the planar surface of the sample when the sample holder is received in the measurement chamber; and a detector positioned and configured to detect scattered light from the measurement volume, wherein the apparatus is configured to allow for detection of the scattered light by the detector over a range of distances from the surface of the sample.
摘要:
The invention relates to a method for simulating dynamic fluids comprising a plurality of pseudo particles. The method comprising the steps of: defining a fluid mass density of the pseudo particle masses; defining a mass density constraint such that the mass density on each pseudo particle is constrained to a reference mass density of a real fluid, whereby an instant propagation of density fluctuations through the entire fluid system is enabled; performing constraint stabilization on said mass density constraint using a time stepping function, wherein said time stepping function is arranged to conserve global physical symmetries and is stable for violations of said mass density constraint; solving a linear system of equations for said mass density constraint in order to calculate density constraint forces; calculating new time discrete pseudo particle velocities from previous pseudo particle velocities with addition of velocity increments calculated from said density constraint forces; and calculating new time discrete pseudo particle positions from the previous pseudo particle positions with additions of the position increments calculated from said new pseudo particle velocities. The invention also relates to an apparatus for simulating dynamic fluids and a computer program product for the same.
摘要:
An extraction tube for exhaust gas emission measurement systems of internal combustion engines includes at least two tubes which extend in parallel over a portion of the length of the extraction tube, and wherein each tube includes an exhaust gas extraction point to which a sampling line can be connected.