639 results about "Magnetic response" patented technology

An un-manned airborne vehicle (UAV), for acquiring aeromagnetic data for geophysical surveying at low altitude on land or over water, comprising an extended fuselage that is adapted to hold and maintain magnetometer and a magnetic compensation magnetometer at a minimum distance from the avionics and propulsion systems of the UAV. The magnetometer measures magnetic anomalies and the magnetic compensation magnetometer measures magnetic responses corresponding to the pitch, yaw and roll of the UAV. A data acquisition system stores and removes the magnetic response measurements from the magnetic anomaly measurements. The data acquisition system also stores a survey flight plan and transmits the same to the avionics system. The generator of the UAV is shielded and the propulsion system is stabilized to reduce magnetic and vibrational noises that can interfere with the operation of the magnetometer.

A read head has a flux guide layer that is immediately adjacent (abuts) the back edge of a read sensor. The flux guide layer is made of a high resistance soft magnetic material that conducts magnetic flux from the back edge of the read sensor so that the magnetic response at the back edge of the read sensor is significantly higher than zero. This increases the efficiency of the read sensor. The material for the flux guide layer is A-B-C where A is selected from the group Fe and Co, B is selected from the group Hf, Y, Ta and Zr and C is selected from the group O and N. In a preferred embodiment A-B-C is Fe-Hf-O and the Msrho of the flux guide layer is greater than 50 times the Msrho of the read sensor layer where the read sensor layer is NiFe, Ms is saturation magnetization and rho is resistivity. Because of the flux guides high resistance current shunting losses are nearly eliminated.

An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly, a casing having a reflective element, a compass sensor and a control. The compass sensor is disposed within the mirror casing and has a first magnetoresponsive sensing element and a second magnetoresponsive sensing element. The control receives a first signal indicative of a magnetic field sensed by the first magnetoresponsive sensing element and a second signal indicative of a magnetic field sensed by the second magnetoresponsive sensing element. The control determines that the casing is adjusted by an occupant of the vehicle in response to a change in the first and second signals being indicative of an abrupt movement of the casing about the mounting structure by an occupant of the vehicle. The control is operable to enter a rapid compensating mode to compensate for the mirror adjustment.

The invention discloses a magnetic response type high-efficiency oil-water separation fiber membrane and a preparation method thereof, and belongs to the field of functional micro-nano fiber materials. The magnetic response type high-efficiency oil-water separation fiber membrane disclosed by the invention is prepared by the following steps: dissolving hydrophobic polymers, such as polyvinylidene fluoride, polyurethane or polycaprolactone, as main raw materials into an organic solvent to form a polymer solution; preparing a non-woven fiber membrane material prepared from micro-nano structure fibers by adopting an electrospinning method; forming a sticky polydopamine membrane through polymerization of polydopamine in an alkaline solution, and firmly attaching magnetic nanoparticles onto the surface of an electrospinning fiber membrane by adopting the sticky polydopamine membrane, so as to prepare the magnetic response type high-efficiency oil-water separation fiber membrane. The fiber membrane disclosed by the invention has a super-hydrophobic/super-oleophilic property in air, and has an excellent adsorptive property on a plurality of common oils; the preparation method of the high-efficiency oil-water separation fiber membrane, disclosed by the invention, is simple, low in energy consumption, and high in efficiency,and can be widely applied to the fields such as remote controllable efficient separation of oily wastewater, and the magnetic responsiveness is realized.

The invention discloses a nucleic acid extraction and purification method based on nanometer magnetic beads, comprising the following steps: mixing a biological sample and a lysis buffer to make nanometer magnetic beads in the lysis buffer and nucleic acid DNA/RNA which moves into the lysis buffer form a magnetic bead-nucleic acid compound; transferring the compound under the action of a magnetic field to a washing buffer to wash off impurities on the magnetic bead-nucleic acid compound; and transferring the washed magnetic bead- nucleic acid compound under the action of the magnetic field to an elution buffer so as to elute and recover nucleic acid. The nanometer magnetic beads used in the invention have advantages of uniform size, smooth surface, large surface area ratio, high adsorption capacity of nucleic acid, fast magnetic response speed and rapid separation, and can be stored together with the lysis buffer at room temperature for a long time. The extracted nucleic acid DNA/RNA has high purity, is complete and can be directly used for follow-up detection. The method provided by the invention has shorter nucleic acid extraction time than a general magnetic bead method by the use of a nucleic acid extraction reagent, is more suitable for automation and is adopted to realize high-flux nucleic acid DNA/RNA extraction.

A novel detection or quantifying method for biological entities or molecules such as, but not limited to, DNA, microorganisms and pathogens, proteins and antibodies, that by themselves are target molecules or from which target molecules are extracted, comprises the steps of i) forming target molecule-dependent volume-amplified entities, ii) allowing magnetic nanoparticles to bind to said volume-amplified entities, and iii) measuring changes in dynamic magnetic response of the magnetic nanoparticles caused by the increase in hydrodynamic volume of said magnetic nanoparticles or measuring the magnetic field due to the magnetic nanoparticles as they bind to a sensor surface functionalized with a secondary capturing probe. Biosensors and kits are adapted to be used in such a method.

The present invention relates to method and device for detecting changes of a magnetic response of at least one magnetic particle in a carrier fluid. The method comprises: using a measuring procedure comprising measuring the characteristic rotation time of said magnetic particle, said measuring procedure further involving measuring Brownian relaxation in said carrier fluid under influence of an external pulsed excitation magnetic field, and based on said influence of said external pulsed excitation magnetic field measuring a hydrodynamic volume of a particle or a change in a hydrodynamic volume of the particle change upon modification of an effective volume of the particle or its interaction with said carrier fluid by detecting change of magnetization of the particle with time by monitoring change of an output signal in detection coil.

An apparatus including a spin to charge conversion node; and a charge to spin conversion node, wherein an input to the spin to charge conversion node produces an output at the charge to spin conversion node. An apparatus including a magnet including an input node and output node, the input node including a capacitor operable to generate magnetic response in the magnet and the output node including at least one spin to charge conversion material. A method including injecting a spin current from a first magnet; converting the spin current into a charge current operable to produce a magnetoelectric interaction with a second magnet; and changing a direction of magnetization of the second magnet in response to the magnetoelectric interaction. A method including injecting a spin current from an input node of a magnet; and converting the spin current into a charge current at an output node of the magnet.

The invention discloses an integration detection system of pulse eddy current stress cracking and a method thereof. The system comprises a signal stimulating module, a magnetic sensor module, a strain-gauge bridge module, a signal conditioning module, a data acquisition module and a computer processing module. In the method, on the basis of combining pulse eddy current excitation coils with strain-gauge sensitive elements, the required differential stable value for strain measurement and the required differential transient value for pulse eddy current measurement are obtained, and a two-dimensional magnetic sensor array is adopted to carry out high-resolution magnetic response imaging; and by adopting a simulation test and an actual test, signal separation, feature extraction and data fusion are performed to achieve simultaneous on-line detection of material surface defects, subsurface defects and stress and microstructure state, achieve recessive defect judgment of materials and estimation of defects which are not formed, and provide necessary information for health monitoring and life estimation of an aircraft structure.

A preparation method of nanospheres with core-shell structure having a shell of silicon dioxide belongs to the nanometer material technology field and comprises the steps of: (1)dispersing magnetic particle or aggregate of magnetic particle and quantum dot particle into alkaline water solution; (2) solving the surface active agent into non-polar solvent; (3)mixing the solution obtained from step (1) with the solution obtained from step (2) with a volume ratio of 1:1000-1:1, and obtaining emulsion or microemulsion by ultrasound or vortex mixing method; (4)adding tetraethoxysilane into emulsion or microemulsion and agitating, wherein, the volume of tetraethoxysilane occupies 0.1~10% of the emulsion volume; (5)centrifuge washing and drying. The nanosphere of the present invention has magnetic response property, or has magnetic response property and photoluminescent property synchronously, and has uniform grain size, besides the preparation method is simple.

The present invention relates to a magnetic nano crystal which is prepared with the ''one-port'' method and can be highly dissolved and steadily dispersed in the biological buffer liquid. Under the condition that the biocompatibility polymer exits or the biocompatibility polymer, the small-molecule amine with alkyl chain, carboxyl acid or alcohol exist together, the metal precursor is decomposed with high temperature in the high boiling point nonpolar or high boiling point weak-polar solvent for preparing the high-crystallinity magnetic nano crystal with different kind, different dimension and different shapes. The technical method adopted by the invention has the characters of simple technique, easy operation. The grain diameter of the magnetic nano crystal prepared with the technique has the advantages of uniformity, controllability, high crystallinity, strong magnetic response and good biocompatibility. Most important, the dry powder of the obtained magnetic nano crystal still represents excellent dissolvability after placing in the biological buffer liquid for a long time. Therefore, the biocompatibility magnetic nano crystal prepared by the technical method has the characters of easy storing and transportation, and is suitable for large-scale and commercial production.

A magnetism fluorescence composite mainly consists of modified magnetism crystal material, modified fluorescent semiconductor crystal material and matrix material; among them modified magnetism crystal material uses silylating reagent partaking -NH2, -C=C, -SH, -S-S or epoxy group; modified fluorescent semiconductor crystal material uses Reactive surfactant. The composite of this invention not only has excellent fluorescence property but also has conspicuous magnetic response property, its merit is not only fluorescent nanometer crystal and magnetism nanometer particle link with basis material possessing tight Structure through chemical bond, but also the integration of fluorescence and magnetism provides new application for high sensitive bioanalysis and detection.

The invention belongs to the technical fields of macromolecular materials and biological medicine, and relates to a medicament loading method for a magnetic macromolecular immunosuppressant with magnetic response performance. The method comprises the steps of adding magnetic particles into immunosuppressant solution to obtain magnetic medicament loading particles of the immunosuppressant by fully and evenly mixing, vibration treatment and the like. The method improves the dispersing state of the immunosuppressant, improves the bioavailability, reduces the dosage, enables the immunosuppressant to have targeting property, reduces the toxic and side effects of the medicament, and can be applied in the targeted treatment. The magnetic medicament loading particles of the immunosuppressant have the advantages of large medicament loading amount, high packing rate, simple method and low cost, and is favorable for popularization.

The invention relates to a method for preparing micro-droplets based on a micro-fluidic chip modification technology. The method adopts a sol-gel method to carry out modification treatment on a micro-fluidic chip. The method has the characteristics of being obvious in modifying effect, simple to operate, and the like; and is suitable for complex-structure or functional micro-droplets such as water-in-oil type micro-droplets, multiple-in-one type micro-droplets, magnetic response type micro-droplets and the like.

The invention discloses magnetic composite hydroxyapatite nanoparticles. The magnetic composite hydroxyapatite nanoparticles are composed of Fe3O4 nanoparticles and hydroxyapatite nanoparticles, wherein the molar ratio of the Fe3O4 to the hydroxyapatite is (1-10): 1; the magnetic composite hydroxyapatite nanoparticles are spherical aggregate or agglomerate in which the Fe3O4 nanoparticles and the hydroxyapatite nanoparticles are distributed evenly and alternately. The preparation method of the magnetic composite hydroxyapatite nanoparticles is simple; the nanoparticles are capable of efficiently removing heavy metal ions in sewage, and in the later treatment period, quick magnetic separation can be realized; the nanoparticles have the adsorbing capacity of 440mg/g to lead ions, the adsorbing capacity of 238mg/g to cadmium ions, the adsorbing capacity of 139mg/g to zinc ions and the adsorbing capacity of 135mg/g to copper ions in the sewage; the magnetic composite hydroxyapatite nanoparticles have a rapid magnetic response characteristic, and are capable of realizing rapid solid-liquid separation with an external magnetic field, and the separation process is high in separation efficiency, and simple and efficient to operate; and besides, the nanoparticles are not residual in water and do not cause secondary pollution to the water and the environment.