A magnetic field generation device (100) includes a first magnet (1), a second magnet (2), and a position adjustment mechanism (5). The second magnet (2), together with the first magnet (1), generates a magnetic field. The position adjustment mechanism (5) adjusts a position of the first magnet (1). The magnetic field generation device (100) controls the value of the product of a magnetic flux density and a magnetic flux density gradient in the magnetic field through the adjustment of the position of the first magnet (1) by the position adjustment mechanism (5).

Disclosed herein are methods and systems that use magnetic complexes in wellbore monitoring. A well monitoring system may comprise magnetic complexes disposed in a subterranean formation, wherein the magnetic complexes each comprise a first magnetic portion, a second magnetic portion, and a spacer portion; and an electromagnetic interrogator, wherein the electromagnetic interrogator comprises an electromagnetic source and an electromagnetic detector.

Magnetic cell levitation and cell monitoring systems and methods are disclosed. A method for separating a heterogeneous population of cells is performed by placing a microcapillary channel containing the heterogeneous population of cells in a magnetically-responsive medium in the disclosed levitation system and separating the cells by balancing magnetic and corrected gravitational forces on the individual cells. A levitation system is also disclosed, having a microscope on which the microcapillary channel is placed and a set of two magnets between which the microcapillary channel is placed. Additionally, a method for monitoring cellular processes in real-time using the levitation system is disclosed.

Magnetic cell levitation and cell monitoring systems and methods are disclosed. A method for separating a heterogeneous population of cells is performed by placing a microcapillary channel containing the heterogeneous population of cells in a magnetically-responsive medium in the disclosed levitation system and separating the cells by balancing magnetic and corrected gravitational forces on the individual cells. A levitation system is also disclosed, having a microscope on which the microcapillary channel is placed and a set of two magnets between which the microcapillary channel is placed. Additionally, a method for monitoring cellular processes in real-time using the levitation system is disclosed.

The method for particle analysis includes a first magnetic susceptibility measurement step S4 of measuring a volume magnetic susceptibility of each of first particles p1; an encapsulation treatment step S5 of performing an encapsulation treatment so that the first particles p1 encapsulate an encapsulation target component pt smaller than the first particles p1; a second magnetic susceptibility measurement step S8 of measuring a volume magnetic susceptibility of each of second particles p2 as an analysis target that are the first particles p1 after the encapsulation treatment; and a step S9 of analyzing whether or not the encapsulation target component pt is encapsulated in the second particles p2 based on a result of measurement in the first magnetic susceptibility measurement step S4 and a result of measurement in the second magnetic susceptibility measurement step S8.

Volume susceptibilities (s) of dispersoid particles (s) dispersed in a dispersion medium (m) are first obtained by magnetophoresis. Affinity of the dispersoid particles (s) for the dispersion medium (m) is then analyzed using the volume susceptibilities (s) of the respective dispersoid particles (s) and a volume susceptibility (m) of the dispersion medium (m).

Volume susceptibilities (s) of dispersoid particles (s) dispersed in a dispersion medium (m) are first obtained by magnetophoresis. Affinity of the dispersoid particles (s) for the dispersion medium (m) is then analyzed using the volume susceptibilities (s) of the respective dispersoid particles (s) and a volume susceptibility (m) of the dispersion medium (m).

Disclosed is a system for detecting one or more target analytes which includes a resistor structure comprised of a substrate, a graphene-based nanocomposite material located on a surface of the substrate with the graphene-based nanocomposite material exhibiting one or more magnetoresistance properties. A surface of the nanocomposite material includes molecular sensing elements bound thereto which exhibit an affinity for binding with the target analytes. Electrodes are connected to the resistor structure connectable to a power source and a device for measuring a resistance across the resistor structure for sensing a giant magnetoresistance (GMR) value of the resistor structure. Included are magnetic colloidal nanoparticles exhibiting preselected magnetic properties with an outer surface of the magnetic colloidal nanoparticles being modified to allow interaction with the surface of the resistor structure resulting in a change in the GMR value of the resistor structure. The resistor structure is configured to be operably connected to a magnetic field generating device configured to apply a magnetic field to the graphene-based nanocomposite wherein the field has a magnitude in a range from greater than 0 to about 5 Tesla. A presence of target analytes in a vicinity of the surface of the resistor structure induces the interaction to occur by binding of the target analytes to the molecular sensing elements bound thereto causing a IT change in GMR value of the resistor structure.

Disclosed is a system for detecting one or more target analytes which includes a resistor structure comprised of a substrate, a graphene-based nanocomposite material located on a surface of the substrate with the graphene-based nanocomposite material exhibiting one or more magnetoresistance properties. A surface of the nanocomposite material includes molecular sensing elements bound thereto which exhibit an affinity for binding with the target analytes. Electrodes are connected to the resistor structure connectable to a power source and a device for measuring a resistance across the resistor structure for sensing a giant magnetoresistance (GMR) value of the resistor structure. Included are magnetic colloidal nanoparticles exhibiting preselected magnetic properties with an outer surface of the magnetic colloidal nanoparticles being modified to allow interaction with the surface of the resistor structure resulting in a change in the GMR value of the resistor structure. The resistor structure is configured to be operably connected to a magnetic field generating device configured to apply a magnetic field to the graphene-based nanocomposite wherein the field has a magnitude in a range from greater than 0 to about 5 Tesla. A presence of target analytes in a vicinity of the surface of the resistor structure induces the interaction to occur by binding of the target analytes to the molecular sensing elements bound thereto causing a IT change in GMR value of the resistor structure.

A device for detection of magnetic permeability () or, alternatively, relative magnetic permeability (r) or, alternatively relative magnetic susceptibility (r-) of a sample is described. The device comprises a sample chamber having at least one opening for introduction of a sample or a sample container holding a sample and an electronic circuit. The device also comprises a coil surrounding said sample chamber, and also an electronic circuit adapted to measure the inductance of said coil. The sample chamber, coil and at least one component of the electronic circuit are placed in a temperature controlled zone. Said at least one component in said electronic circuit is/are selected from the group consisting of capacitors, sensors, precision voltage references, precision regulators, low pass and or high pass filters.