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100results about How to "Small gradient" patented technology

System and method for use of nanoparticles in imaging and temperature measurement

This invention provides a system and method that improves the sensitivity and localization capabilities of Magnetic Particle Imaging (MPI) by using combinations of time-varying and static magnetic fields. Combinations of magnetic fields can be used to distribute the signals coming from the magnetic particles among the harmonics and other frequencies in specific ways to improve sensitivity and to provide localization information to speed up or improve the signal-to-noise ratio (SNR) of imaging and / or eliminate the need for saturation fields currently used in MPI. In various embodiments, coils can be provided to extend the sub-saturation region in which nanoparticles reside; to provide a static field offset to bring nanoparticles nearer to saturation; to introduce even and odd harmonics that can be observed; and / or to introduce combinations of frequencies for more-defined observation of signals from nanoparticles. Further embodiments provide for reading of the signal produced by cyclically saturated magnetic nanoparticles in a sample so as to provide a measurement of the temperature of those nanoparticles. The spectral distribution of the signal generated provides estimates of the temperature of the nanoparticles. Related factors may also be estimated—binding energies of the nanoparticles, phase changes, bound fraction of the particles or stiffness of the materials in which the nanoparticles are imbedded.
Owner:DARTMOUTH HITCHCOCK CLINIC

Environmental-control type closed greenhouse

The invention relates to an environmental-control type closed greenhouse which comprises a closed greenhouse, wherein a plurality of support upright posts are arranged in the greenhouse, a ceiling is supported at the top parts of the support upright posts, a columnar air duct on which air vents are overspread is attached to the support upright post, enclosing and covering materials are arranged outside the greenhouse enclosed by the support upright posts and the ceiling, a grating-type air-supply perforated plate is paved on the ground, a plurality of cultivating beds are positioned on the air-supply perforated plate, a plurality of air-supply ducts and air-return ducts are arranged at the lower part of the air-supply perforated plate at intervals, a functional air duct is arranged outside the greenhouse, all air-supply ducts are arranged at an air-supply port of the function air duct in parallel, one end of each air-return ducts is connected at an air-return port of the functional air duct in parallel, and the air-return port of the functional air duct is also communicated with the bottom parts of all upright posts; an embedded network environmental-control system and a sensor module are arranged in the greenhouse; and an inner shading device and an outer shading device are respectively arranged at the inner side and the outer side of the ceiling. The invention can be widely applied to various scientific experimental studies or actual production fields, such as environmental control, plant environment physiological feedback, inheritance breeding, plant information detection, and the like, and is especially suitable for the safety test of transgenic plant cultivation.
Owner:BEIJING SHENGYANGGU SCI & TECH

System and method for use of nanoparticles in imaging and temperature measurement

This invention provides a system and method that improves the sensitivity and localization capabilities of Magnetic Particle Imaging (MPI) by using combinations of time-varying and static magnetic fields. Combinations of magnetic fields can be used to distribute the signals coming from the magnetic particles among the harmonics and other frequencies in specific ways to improve sensitivity and to provide localization information to speed up or improve the signal-to-noise ratio (SNR) of imaging and / or eliminate the need for saturation fields currently used in MPI. In various embodiments, coils can be provided to extend the sub-saturation region in which nanoparticles reside; to provide a static field offset to bring nanoparticles nearer to saturation; to introduce even and odd harmonics that can be observed; and / or to introduce combinations of frequencies for more-defined observation of signals from nanoparticles. Further embodiments provide for reading of the signal produced by cyclically saturated magnetic nanoparticles in a sample so as to provide a measurement of the temperature of those nanoparticles. The spectral distribution of the signal generated provides estimates of the temperature of the nanoparticles. Related factors may also be estimated—binding energies of the nanoparticles, phase changes, bound fraction of the particles or stiffness of the materials in which the nanoparticles are imbedded.
Owner:DARTMOUTH HITCHCOCK CLINIC

Fluid flow assembly and fuel cell electric pile comprising same

The invention relates to a fluid flow assembly and a fuel cell electric pile comprising the same. The fluid flow assembly is used for gas and fluid flow of a reversible fuel cell for hydrogen production power generation, and also applicable to a power generation fuel cell or a hydrogen production electrolysis apparatus with a single function; the fluid flow assembly comprises distribution flow guiding plates used for drainage of the fluid and porous fluid flowing layers used as fluid main flowing channels in a combination manner; a fuel cell pile or an electrolysis apparatus comprising the fluid flow assembly comprises a plurality of single cell assemblies in an overlaid manner; each single cell comprises one fluid flow assembly used as a negative electrode and the other fluid flow assembly used as a positive electrode; and a conventional air permeating layer is arranged in an MEA membrane electrode which only includes a proton exchange membrane and a catalytic layer. Compared with the prior art, the fluid flow assembly and the fuel cell electric pile comprising the same have the advantages of capabilities of rapidly and effectively discharging product fluids, more uniformed fluid distribution, stable power generation performance of the fuel cell due to graded setting of drainage grooves, and the like.
Owner:QINGDAO HANHE HYDROGEN ENERGY EQUIP TECH CO LTD

Method for removing polyphenylene sulfide byproduct dry salt organic substance adopting self-propagating heat-storing incinerating device

The invention relates to the technical field of solid waste treatment, and particularly relates to a method for removing a polyphenylene sulfide byproduct dry salt organic substance adopting a self-propagating heat-storing incinerating device. The method comprises the following steps that (1) byproduct dry salt is homogenized into dry salt particles or into powder salt, and then the powder salt ispelletized to obtain dry salt pellets; and (2) the dry salt pellets or the dry salt particles are used as materials to be subjected to self-propagating pyrolysis treatment, the pyrolysis temperatureis 600-800 DEG C, the materials are subjected to pyrolysis to obtain finished salt, wherein self-propagating pyrolysis refers to the process that on the premise of not turning over the materials, pyrolysis is carried out through heat on the basis of self-propagating of the materials. According to the method, the materials are not turned over in the pyrolysis process of the byproduct dry salt, theheat is transferred through self-propagating of the materials to carry out pyrolysis, and then loss of the lithium salt in the pyrolysis process is reduced; and meanwhile, oligomers in the byproduct dry salt can be completely removed, so that the phenomenon that the finished salt melts and agglomerates is avoided, and subsequent lithium salt extraction is facilitated.
Owner:CHONGQING ANGRUIYUE SCI & TECH
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