349 results about "Polarizability" patented technology

Fused ring bridge, ring locked dyes that form thermally stable photorfractive compositions. The fused ring bridge structures are pi -conjugated bonds in benzene-, naphthalene- or anthracene-derived fused ring systems that connect donor and acceptor groups. The donor and acceptor groups contribute to a high molecular dipole moment and linear polarizability anisotropy. The polarization characteristics of the dye molecules are stabilized since the bonds in the fused ring bridge are not susceptible to rotation, reducing the opportunity for photoisomerization. The dyes are compatible with polymeric compositions, including thermoplastics. The dyes are electrically neutral but have charge transport, electronic and orientational properties such that upon illumination of a composition containing the dye, the dye facilitates refractive index modulation and a photorefractive effect that can be utilized advantageously in numerous applications such as in optical quality devices and biological imaging.

A nanoparticle sensor is capable of detecting and recognizing single nanoparticles in an aqueous environment. Such sensor may find applications in broad areas of science and technology, from the analysis of diesel engine emissions to the detection of biological warfare agents. Particle detection is based on interferometric detection of multi-color light, scattered by the particle. On the fundamental level, the detected signal has a weaker dependence on particle size (ÿ R³), compared to standard detection methods (ÿ R⁶). This leads to a significantly larger signal-to-noise ratio for smaller particles. By using a multi-color or white excitation light, particle dielectric properties are probed at different frequencies. This scheme samples the frequency dependence of the particle's polarizability thereby making it possible to predict the composition of the particle material. The detection scheme also employs a heterodyne or pseudoheterodyne detection configuration, which allows it to reduce or eliminate noise contribution from phase variations, which appear in any interferometric measurements.

A light beam steering transmissive element with an arbitrarily sized aperture comprising at least one layer of a insulating matrix modified for increased polarizability under electrical, magnetic or optical stimulation, between two or more substrates that can be electrically configured to provide signal modulation (optical, magnetic or electrical) that will control the wavefronts of incident light, thereby taking off-axis electromagnetic signals and aligning them to the aperture of a receiving element positioned near the device, or the reverse, sending signals originating behind the steering device to a variety of user-defined angles in two or more dimensions.

The invention relates to a precise control method of an atom spin SERF (Self-Exchange Relaxation-Free) state for stabilizing an atom spin device, which comprises the following steps that firstly, a precise equation is established for the atom spin SERF state, and a modulation method is adopted to measure the atom spin polarizability to establish a control target; then a control system model as precise as possible is established on the basis of an SERF model, and a parameter identification method is adopted to estimate unknown parameters of the model; and finally, according to the control target, a special structure design control law of the established model is fully used, i.e. the switching time, frequency, orientation and power of laser and the switching time of a modulation magnetic field are optimized, and the atom spin SERF state is precisely controlled in real time in accordance with a quantum control algorithm. By using the precise control method, the atom spin relaxation time is increased, and the problem of instability of scale factors of atom devices such as an atom spin gyroscope and an atom magnetometer based on the atom spin SERF effect is solved. The precise control method can be used for improving the long-time drift precision and the low-frequency sensitivity based on the SERF atom spin device.

The invention provides a method for measuring alkali metal atomic polarizability of a nuclear magnetic resonance gyro in real time and belongs to the field of atomic physics. The method includes: measuring alkali metal atomic densities of an atomic pool at different temperatures, measuring atomic nuclear magnetic resonance frequency of inert gas caused by polarization of alkali metal atoms, and thus acquiring polarizability of the alkali metal atoms in the atomic pool without changing the optical path structure of the nuclear magnetic resonance gyro and the magnetic field environment; building a three-dimensional model of changes in nuclear magnetic resonance frequency of the inert gas in the atomic pool along with temperature and the alkali metal atomic polarizability, measuring the frequency shift of atomic NMR (nuclear magnetic resonance) of the inert gas at any temperature point while the nuclear magnetic resonance frequency normally runs, and thus calculating the polarizability of the alkali metal atoms in the atomic pool in real time. The method has the advantages that the method is simple, no influence is caused to the optical path structure of the nuclear magnetic resonance gyro and the method is of great significance to improving the performance of the nuclear magnetic resonance gyro.

The use of optical microcavities, high-Q resonators and slow-light structures as tools for detecting molecules and probing conformations and measuring polarizability and anisotropy of molecules and molecular assemblies using a pump-probe approach is described. Resonances are excited simultaneously or sequentially with pump and probe beams coupled to the same microcavity, so that a pump beam wavelength can be chosen to interact with molecules adsorbed to the microcavity surface, whereas a probe beam wavelength can be chosen to non-invasively measure pump-induced perturbations. The induced perturbations are manifest due to changes of resonance conditions and measured from changes in transfer characteristics or from changes of the scattering spectra of a microcavity-waveguide system. The perturbations induced by the pump beam may be due to polarizability changes, changes in molecular conformation, breakage or formation of chemical bonds, triggering of excited states, and formation of new chemical species. Furthermore, heat may be generated due to absorption of the pump beam. Furthermore, the use resonant modes with different states of polarization allows for measurements of polarizability and its anisotropy in samples interacting with the optical device.

The invention discloses an integrated measurement device for atomic density and polarizability of alkali metal vapor. The device comprises a drive laser subsystem, a measuring and sensing unit subsystem and a detection unit subsystem, wherein the measuring and sensing unit subsystem has the function of providing a physical carrier and testing conditions for measurement of density and polarizability; the drive laser subsystem has the function of polarizing alkali metal atoms in an air chamber; and the detection unit subsystem has the functions of measuring a deflection angle of detection light under different testing conditions and calculating the deflection angle to obtain the atomic density and polarizability. According to the device, pumping light is generated to irradiate the air chamber by utilizing the drive laser subsystem, a fixed magnetic field is applied to generate a Faraday rotating angle in the measuring and sensing unit subsystem, the deflection angle of the detection light is measured by utilizing the detection unit subsystem, and finally the atomic density and polarizability are calculated through a data processor. The device has the characteristics of simple measurement system and high measurement accuracy and has important significance for improving the inertia of atoms and the magnetic field measurement sensitivity.

The invention relates to a method for realizing oil-gas detection by applying a long-offset distance transient electromagnetic array method. The method comprises the following steps: firstly, carrying out ATEM (analytical transmission electron microscopy) observation on a detection region to acquire data; selecting measuring points without obvious distortion or negative anomaly of electric field components while an induced polarization field is not stripped, utilizing the ATEM data for inversion, and acquiring a high-resolution lamellar specific resistance model in a detection region; then carrying out ATEM forward operation to obtain transient induced electric field or magnetic field attenuation curves of all the measuring points in the detection region; substracting the electric field or magnetic field component attenuation curve acquired during forward operation by the actually observed ATEM electric field or magnetic field component attenuation curve at the same observation time point to obtain a time domain induced polarization spectrum; applying a time domain induced polarization method for inversion to obtain the polarizability of an underground medium; and carrying out detection and evaluation on an oil-gas reservoir by utilizing the specific resistance and polarizability parameters. According to the invention, the accuracy and reliability of exploration on the oil-gasreservoir by utilizing an electromagnetic method are greatly enhanced, the working efficiency is improved, and the exploration cost is lowered.

In one aspect, an accommodative intraocular lens (IOL) is disclosed that includes an optic having at least a portion formed of a polarizable and/or and electro-active material. Once implanted in a subject's eye, a change in the index of refraction of the polarizable and/or electro-active portion in response to forces applied to the optic via the eye's ciliary muscle can cause a change in the optical power of the optic, thereby allowing accommodation.

The invention provides a method and device for evaluating a total organic carbon content in a shale gas reservoir. The method includes the following steps: acquiring earthquake data of a target area and electromagnetic data of the target area; making the electromagnetic data of the target area undergo a time domain processing method and a frequency domain processing method; processing the earthquake data of the target area to obtain the burial depth and thickness of the shale gas reservoir and the distribution range of the shale gas reservoir in the target area; using the burial depth, thickness and distribution range of the shale gas reservoir as constraint conditions to carry out restraint inversion on a complex resistivity of the target area, obtained through a time domain processing method so that a distribution change regularity of the complex resistivity of the shale gas reservoir is obtained; according to a relation of the distribution change regularity of the complex resistivity of the shale gas reservoir and the frequency domain complex resistivity of the target area, obtained through the frequency domain processing method, carrying out inversion so as to obtain a distribution change regularity of the polarizability of the shale gas reservoir; and according to the distribution change regularity of the complex resistivity of the shale gas reservoir and the distribution change regularity of the polarizability of the shale gas reservoir, determining areas, which are high in total organic carbon content, in the shale gas reservoir.

The invention discloses a ground feature classifying method based on simplified polarization synthetic aperture radar data, which relates to the synthetic aperture radar remote sensing information processing technology. The ground feature classifying method includes steps: a) obtaining Stokes parameters after filtering; b) extracting characteristic parameters including polarizability m, relative phase difference delta among orthogonal channels and total polarization power span for showing scattering mechanisms; c) calculating power ingredients corresponding to the basic scattering mechanisms, and determining main scattering mechanisms of pixels and dividing data into three types of pixels with identical scattering characteristics; d) further dividing each type of pixels with identical scattering characteristics into a plurality of types of pixels with equal sample numbers by the aid of the span; and e) realizing iterative Wishart classification. The ground feature classifying method is simple in principle and convenient in calculation, and can be used for analyzing and classifying ground feature scattering characteristics.

The invention discloses a lung rapid magnetic resonance imaging method based on prior knowledge and sparse sampling. A hyperpolarization gas contrast medium makes lung magnetic resonance imaging possible. In the imaging process, an imaging object needs to hold the breath to reduce generation of motion artifacts, the polarizability of hyperpolarization gas is attenuated rapidly along with the time, the signal-to-noise ratio of the image is reduced, and therefore great significance for improvement of the imaging speed is achieved. According to the lung rapid magnetic resonance imaging method, firstly hydrogen proton magnetic resonance imaging is carried out on the lung area firstly, the prior information of signal distribution of the lung area is extracted through an image processing method, a self-adapting hyperpolarization gas sparse sampling pulse sequence is generated according to the prior information, and the lung is imaged after the imaging object inhales the hyperpolarization gas. The sampling points are reduced, so that the imaging time is shortened. Due to the guidance of the prior information, the polarizability of the gas contrast medium is used more reasonably, and the image quality is equal to or better than that of a full-sampling method.

The invention discloses a three-dimensional numeral simulation method based on an arbitrary dipole-dipole device for a direct-current induced polarization method. The three-dimensional numeral simulation method includes the steps of adopting a three-dimensional direct-current induced polarization arbitrary dipole-dipole device to carry out all-region observation and parameter measurement; calculating a specific resistance model of a normalized background electric field of actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability ofthe actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability of a theoretical model. According to the method, under complex conditions, all-region observation of three-dimensional numeral simulation of the three-dimensional direct-current induced polarization arbitrary dipole-dipole device can be achieved without limitation of null lines of an electric field, the distribution of electrodes is flexible, and as for an important exploring area, the density of measurement points can be enhanced freely, the method is capable of adaptingto exploration in a complex environment; more abundant three-dimensional information of an underground target body can be obtained, and preparation conditions can be provided for inversion imaging ofeach anisotropic medium; the method has the advantages of being big in morphological difference, abundant in polarization information, high in resolution ratio, and capable of effectively improving the calculation accuracy of numeral simulation.

The invention provides a dilution type chaff interference identification method based on polarization scattering transformation. The method includes step 1 acquiring a polarization scattering matrixof a target and a chaff; step 2 calculating the polarization scattering parameters (as shown in the description) of the target and the chaff; step 3 calculating the absolute value (as shown in the description) of the correlation between the co-polarization and the cross-polarized channel of the target and chaff; and step 4 utilizing an SVM method to realize classification and recognition of the chaff dilution type interference. The method disclosed by the invention has the advantages that the problem of diluted type chaff interference identification is researched, the chaff polarization interference is revealed from the physical scattering layer, and the method is more stable compared with a traditional chaff diluted type interference identification method, and the identification effect isbetter; the two polarization identification quantities (as shown in the description) has small orientation distribution dependence on the chaff, and the method has a very strong application prospect,and can be applied to recognition of chaff diluted type interference in actual combat such as air defense, anti-warships and reverse guide.

The invention relates to the field of seismic exploration, in particular to a surface wave pressing method which comprises the steps of: carrying out Hilbert conversion on single-component seismic signals; forming a plurality of signals by using the signals after Hilbert conversion; computing corresponding elliptical polarizability according to the signals; and pressing according to the obtained elliptical polarizability to obtain pressed signals. By adopting the surface wave pressing method of the invention in a theoretical simulation test, Rayleigh surface waves after instant polarization filtering can be well attenuated, and reflected waves are obvious; generally indicated by the application effect of outdoor actual data, by adopting the surface wave pressing method of the invention, the energy of surface waves can be well pressed and the pressed surface waves can better keep the true amplitude of a seismic record.

A cellulose acylate film comprising at least one retardation raising agent having specific rod-like polarizability anisotropy or specific plane polarizability anisotropy, and specific distance between terminals of a molecule in a specific amount; a process for producing the same; and a polarizing plate and liquid crystal display using the same.

Frequency selection surface with dual band pass can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in comm. system of satellite, radar etc. identical periodic outer square annular slot units and periodic inner square annular slot units are etched on up and low metal surfaces of base plate so as to form periodic dual square annular slot array in two layers. A series of metalized through holes with even interval surrounding each doublelayer square annular periodic slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate equivalent to traditional metal cavity. Comparing with frequency selection surface in dual frequency composed of periodic patches or slots in two different sizes, the new structure introduces cavity resonance mode, realizes unilateral drooping characteristic in dual frequency so as to raise selectivity characteristic greatly, and provides good stability for angle and polarizability.

This invention belongs to the technical field of magnetic recording, specifically is a spin valve with vertical magnetic anisotropy. Ferromagnetic layers of upper, middle and lower adopt Co/Ni multi-layer film structure and are made by utilizing a method of magnetron sputtering to deposit under the normal temperature. The Co/Ni multi-layer film includes the feature of a preferred direction of magnetization vertical with a film surface because of larger surface and interface anisotropy, and the properties, such as the coefficient of the magnetic vertical anisotropy, the coercive force can be modulated through thicknesses, periodicity and buffer layer of layers of Co, Ni. In addition, Co and Ni are the magnetic materials and have bigger spin polarizability. A whole spin valve and a pseudo spin valve GMR signal can achieve 5/4 to 7.7%; and the exchange bias field of the whole spin valve can achieve more than 4500e, and the thermal stability can achieve 250 degrees centigrade. This invention has an important application value in the computer hard disk reading head, MRAM and the other spin electronic apparatuses.

Metal-oxide gas sensor. According to one embodiment, the sensor includes a layer or pellet of tungsten trioxide (WO₃) substituted with one or more added metals. Preferably, the added metals are substituted in a concentration between about 0.005 and 10%, have an oxidation state less than +6, and possess a similar ionic radius to W⁶⁺. The substituted metal oxides are preferably formed as nanoparticles and sintered into a dense structure or coating possessing a surface-depletion layer sensitive to the surface adsorption of gas molecules and whose resistance changes in a predictable manner with gas adsorption. The extent of resistance change, rate of change and rate of desorption can be different for different gases, depending on the gas molecule's polarizability, dipole moments and electron configuration. The sensor can be used in a wide range of temperatures and corrosive conditions because of the intrinsic stability of the substituted metal oxides.

The invention provides a magneto-resistive effect device having a CPP (current perpendicular to plane) structure comprising a nonmagnetic spacer layer, and a fixed magnetized layer and a free layer stacked one upon another with said nonmagnetic spacer layer sandwiched between them, with a sense current applied in a stacking direction, wherein said free layer functions such that its magnetization direction changes depending on an external magnetic field, and is made up of a multilayer structure including a Heusler alloy layer, wherein an Fe layer is formed on one of both planes of said Heusler alloy layer in the stacking direction, wherein said one plane is near to at least a nonmagnetic spacer layer side, and said fixed magnetization layer is made up of a multilayer structure including a Heusler alloy layer, wherein Fe layers are formed on both plane sides of said Heusler alloy layer in the stacking direction with said Heusler alloy layer sandwiched between them. It is thus possible to prevent diffusion of Co atoms contained in the CoFe layer into the Heusler alloy layer, enabling the decrease in the spin polarizability of the Heusler alloy layer to be hold back and achieving a high MR ratio.

The invention provides an underground construction surrounding rock disaster whole time interval induced polarization monitoring method, and belongs to the technical field of mining industry and geotechnical engineering security detection and monitoring. The underground construction surrounding rock disaster whole time interval induced polarization monitoring method relates to a power supply electrode (1), a measuring electrode (2), a digital direct current induced polarization instrument (3), a main control computer (4) and an acousto-optic warning device (5). The power supply electrode (1) and the measuring electrode (2) are respectively connected with the digital direct current induced polarization instrument (3) through connecting wires, the digital direct current induced polarization instrument (3) is mutually communicated with the main control computer (4), the main control computer (4) is communicated with the acousto-optic warning device (5), the power supply electrode (1) and the measuring electrode (2) are arranged in an underground construction roadway or a tunnel surrounding rock monitoring region, and the digital direct current induced polarization instrument (3) and the main control computer (4) record and analyze monitored polarizability of the underground construction roadway or a tunnel surrounding rock in interval time periods in real time. The underground construction surrounding rock disaster whole time interval induced polarization monitoring method has the advantages of being large in monitoring range, high in safety, damage-free, real-time and reliable in monitored data, and capable of early warning in a grading mode.