60 results about "Particle loss" patented technology

A single microchannel is combined with external electromagnets for performing a fast immunoassay within a very small volume. Magnetic / luminescent nanoparticles serve as carriers for the antibodies and as internal luminescent standard. The immunoreaction is accelerated by applying alternating magnetic field by means of the external electromagnets, thus inducing oscillation of the particles and achieving better diffusion during the incubation steps. Using the electromagnets the particles are held into the channel for washing and luminescence detection steps. The luminescence of the particles serves as an internal calibration for the assay and helps to avoid experimental error from particle loss.

A method for reducing the loss of particles from the surface of porous getter bodies is taught herein. The method consists in producing on the surface of the porous getter a thin layer of a metal or metal alloy with a deposition technique selected among the deposition of materials from arc generated plasma, ionic beam deposition and cathodic deposition. The deposition technique allows for granular or columnar surface of the covering material but still allowing access to the surface of the getter material, resulting in a reduced getter particle loss.

This invention provides devices and apparatuses comprising the same, for windowless optical detection of particle-laden samples, for example aerosols or fluid suspensions. The devices make use of passive sheath flow as a mechanism for containing aerosol / fluid suspension flow. The operation of the device reduces particle loss inherent to conventional windowless optical detection schemes. Methods of optical detection and / or analysis of or the particles in a sample using devices of this invention are described.

The invention discloses a charge device, belonging to the technical field of particle change. The device comprise an upper cover, a discharging needle, an inner sleeve, a polar plate, a first electrode fixing sheet, a second electrode fixing sheet, a first O-shaped sealing ring, a second O-shaped sealing ring, an insulating shell, a lower cover and a lead. In the charge device, particles are charged by performing corona discharge, and lateral air inflow of the polar plate is adopted, so that the sedimentation of particles on the wall surface of the polar plate is reduced, the charging efficiency of the particles is increased, and particle loss is reduced.

The invention relates to a magnetic separation device, which comprises a magnetic body, a nonmagnetic sheath and a first container, wherein the magnetic body is provided with a first magnetic pole and a second magnetic pole, the nonmagnetic sheath is movably sheathed on the first magnetic pole, the first container is used for containing mixture suspension liquid of magnetic particles and nonmagnetic particles, and when the first magnetic pole sheathed with the nonmagnetic sheath is placed into the mixture suspension liquid for absorbing the magnetic particles, the second magnetic pole is positioned above the liquid level of the mixture suspension liquid. The magnetic separation device provided by the invention can be used for simply and fast realize the magnetic separation on the magnetic particles, and the magnetic particle loss caused by accidental magnetic particle bringing out by the magnetic body is effectively prevented. When a magnetic iron content measuring method of the magnetic separation device provided by the invention is adopted, the analysis error caused by magnetic particle bringing by the magnetic body can be avoided, and higher precision and higher accuracy are realized.

A filter used to reduce the emission of silica particles used in hydraulic fracturing. The silica reduction cover is a custom fit filter installed onto vent hatches of proppant storage trailers. Proppant storage trailers, or “frac sanders,” have a series of vent hatches that release air and fine particles into the atmosphere during material transfer operations. The silica reduction cover is comprised of filter material and permits the controlled release of high pressure air at each vent hatch while reducing sand particle loss. The silica reduction cover maintains proppant sand product in the trailer for production use while significantly reducing the emission of airborne sand particles in the immediate work and adjoining site areas. The silica reduction cover incorporates a viewing window so that workers may monitor proppant levels in the storage trailer while the silica reduction cover is installed.

The present invention relates to a cyclotron including two internal ion sources for the production of the same particles. The second ion source can be used as a spare ion source which strongly increases the uptime and the reliability of the cyclotron and reduces the maintenance interventions. Advantageously, the cyclotron is further characterized by an optimized close geometry of the different elements within the central region of the cyclotron. The cyclotron of the invention may be further characterized by an adaptation and optimization of the shape of first and second internal ion source to avoid particle losses during the first turn of acceleration. The cyclotron may be further characterized by an adaptation and optimization of the shape of the counter-Dee electrode assembly and possibly the Dee-electrode assembly in order to improve the acceleration field in-between the gaps.

A method for reducing the loss of particles from the surface of porous getter bodies is taught herein. The method consists in producing on the surface of the porous getter a thin layer of a metal or metal alloy with a deposition technique selected among the deposition of materials from arc generated plasma, ionic beam deposition and cathodic deposition. The deposition technique allows for granular or columnar surface of the covering material but still allowing access to the surface of the getter material, resulting in a reduced getter particle loss.

The invention relates to a part of an electrostatic accelerator, aims to solve the problem of accelerated particle loss caused by an electronic load suppression measure of an accelerating tube of the conventional electrostatic accelerator, simplify the accelerating structure and reduce the cost of the accelerating structure, and provides an accelerating electrode for an electrostatic accelerator. The accelerating electrode for the electrostatic accelerator consists of a series of electrode plates, wherein the series of electrode plates comprise conical surface electrode plates with conical surface structures; electrode holes are formed in cone angles of the conical surface structures; the conical surface structures are circular conical surfaces, elliptical conical surfaces or pyramidal surfaces. According to the accelerating electrode for the electrostatic accelerator, focusing force can be provided for forwards-accelerated beam current, and defocusing force can be provided for backwards-accelerated beam current, so that electronic loads and full-voltage effects are suppressed, and meanwhile, accelerated particle loss is avoided; in addition, the accelerating electrode is simpler in accelerating structure, the production or modification cost of the accelerating structure is reduced, and adverse impact on the electrostatic accelerator is avoided.

The invention discloses a coil magnetic system capable of generating a gradient weak magnetic field. The coil magnetic system comprises a hollow pipeline and a plurality of coil assemblies wound on the hollow pipeline. The multiple coil assemblies are sequentially arranged at intervals in the axial direction of the hollow pipeline. Each coil assembly is provided with a plurality of layers of coils wound on the hollow pipeline in the radial direction, and the number of turns and the number of layers increase gradually assembly by assembly from one end to the other end of the hollow pipeline. After exciting currents are applied to the coil magnetic system, an inverted top-shaped background magnetic field is generated in a hollow cavity of the hollow pipeline and around the coil assemblies, the gradient change of the magnetic field generated in the axial direction of the hollow cavity of the hollow pipeline is small, and the magnetic field intensity is distributed uniformly; in addition, the gradient of the magnetic field in the radial direction increases firstly, then decreases to zero, finally increases sharply to the maximum value in the opposite direction and then decreases sharply, the gradient changes repeatedly in this way, and a state with one climax following another is formed. By means of the magnetic field with the characteristics, the recycling rate of fine particle magnetic minerals can be increased, and the magnetic particle loss caused by magnetic inclusion between magnetic particles and gangue particles is reduced.

The invention discloses a radioactive aerosol sampling and measuring device which comprises an air rectification cone provided with a radioactive detector, a shell shielding body arranged around the air rectification cone and a filter paper feeding mechanism, wherein a gas flow channel gap is formed between the air rectification cone and the shell shielding body; and radioactive aerosol particles are collected on the filter paper after passing through the gap of the flow channel, and generated photons enter the radioactive detector to collect signals. Compared with the prior art, the radioactive aerosol sampling and measuring device is provided with the shell shielding body, the problems of particle loss and deposition in the radioactive aerosol sampling process are solved, and data of a radioactive detector system are guaranteed.

The invention relates to the field of alcohol fermentation, in particular to a circulation degassing fluidized bed bioreactor which can improve fermentation efficiency and shorten fermentation period.The bioreactor comprises a reactor body, a gas circulation system and a liquid circulation system, three baffle plates with a certain height and angle and three anti-aeration plates with a certain height and angle are arranged inside the reactor body along the height direction, and immobilized particles move upwards under thrust of gas and liquid and under the buoyancy action of bubbles generatedby the immobilized particles and collide with the baffle plates to realize gas-solid separation. Liquid-solid separation is realized within a circulation area formed among the baffle plates and the anti-aeration plates. By changing hydraulic paths of gas, liquid and solid, particle loss is effectively decreased, the volume load of the bioreactor is improved, and the fermentation period is shortened. The bioreactor is simple in structure and low in manufacturing cost and has a wide popularization and application prospect in industries such as alcohol fermentation.

The invention discloses a monitoring device for internal deformation and fine particle loss of a track subgrade, and relates to the field of monitoring devices; it includes an internal damage monitoring device arranged in the ballast layer of the roadbed, and the internal damage monitoring device is connected with a resistance collector through a wire. The resistance collector is wirelessly connected with a resistance signal receiver. The device for monitoring the internal deformation and loss of fine particles of the rail subgrade provided by the present invention can realize real-time and continuous monitoring of the deformation and loss of fine particles in the railway subgrade under rail traffic load under remote conditions, and is economical and convenient, and has high practical value.

The invention discloses a resistivity testing device capable of regulating the temperature, atmosphere and density of a powder material. Firstly, the equipment is small in volume and convenient, temperature regulation is performed through a constant-temperature zone of a tubular furnace, different electrodes are changed for connection at different temperatures and in different atmospheres, and direct contact resistance between the powder and a wire as well as the redox of an electrode at different temperatures and in different atmospheres is reduced, so that the accuracy of the test data is high; secondly, by adopting a straight-blowing gas supply way at the sealed bottom, direct contact between the gas and the powder as well as uniform gas distribution can be guaranteed, and uniform gas distribution is guaranteed and the problem of powder particle loss is solved through different numbers of gas guide plates; and finally, by adopting a screw type central pressurizing way and increasing the length of a pressurizing screw, uniform pressure distribution between the powder and the electrode can be guaranteed, the fixing stability is high, and the pressure is kept unchanged in the case of material expansion at a high temperature; and moreover, with the same powder mass, the resistivity of the powder of the same material and at different compaction densities is measured according to the rotation number of turns of the screw.

The invention discloses a mass spectrometer with high-resolution flight time. The mass spectrometer comprises a vacuum cavity, an acceleration electrode, a first-stage focusing prism, an X-Y deflection device, an ion flight tube, a second-stage focusing prism, a mass selection device, a momentum speed reducer and a detector, according to the device, charged particles are radially focused through the focusing prism, so that particle loss caused by diffusion is reduced; high-precision mass selection is carried out on the charged particles through a mass selection device, and impurity particles are screened out to achieve high-precision mass spectrum imaging; ions or charged clusters are decelerated in the axial direction through a momentum decelerator, and the Doppler broadening effect caused by momentum is reduced. Through focusing, screening and decelerating, the detection resolution and efficiency of the mass spectrometer can be greatly improved.