136 results about "Molar absorptivity" patented technology

A display device comprises a frame buffer which time-divides a frame displaying one picture into multiple sub-frames, an attenuation signal generating circuit which generates an attenuation signal by dividing the inputted luminosity signal by the designated attenuation coefficient, and a signal switching circuit which inputs luminosity signals before division to the antecedent sub-frame in the relevant frame, at the same time, inputs the above-mentioned attenuation signals after division to the subsequent sub-frame. Consequently, such a hold type display device is realized as is able to control the lowering of the picture brightness, as well as, prevent a moving picture from being unclear, blurred or disordered.

The invention discloses an attenuation filter-based metal artifact removing mixed reconstruction method for CT images. When a CT acquires data, if a scanned object contains a metal object with high absorption coefficients which comprises a tissue attenuation coefficient and a metal attenuation coefficient to cause projection data jump, the scanned object is considered to be destructive and should be corrected; thus, the metal artifact is greatly weakened during FPB reconstruction. The method comprises the following steps: after determining a metal projection area, performing adaptive attenuation adjustment and filter on the determined metal area; reconstructing an entire image through the FBP, performing EM iterative reconstruction on the metal area by using the primary projection data, and correcting the metal area after the adaptive attenuation filter and reconstruction; and compensating the metal projection area. The numerical simulation CT experiments prove that the method can effectively remove metal artifacts and well keep the information of the metal and the surrounding tissue of the metal. Particularly under the condition of multiple metal objects, the method has low calculation complexity and high practical value.

The present invention provides a composite particle having a high molar absorption coefficient for detection with higher detection sensitivity in photoacoustic imaging. In the present invention, a composite particle having a particle, a single-chain antibody which includes an antigen recognition region and a region other than the antigen recognition region and which is conjugated with the particle, and an organic dye conjugated with the single-chain antibody, in which the region other than the antigen recognition region of the single-chain antibody has thiol group, and a functional group of the particle is bound to the thiol group, is provided.

The invention relates to an ultrasonic attenuation spectrum principle based method for measuring the average particle size and concentration of two types of mixed solid particles in a liquid or gas medium. The ultrasonic attenuation spectrum principle based method comprises the following steps of step 1, measuring an experimental measurement ultrasonic attenuation spectrum alpha (f) under the condition that the two types of solid particles A and B are located in a measurement area, wherein f is the ultrasonic frequency; step 2, calculating an acoustic attenuation coefficient Kext of the particle and acoustic wave effect; step 3, determining whether the particles are A particles or B particles and determining whether phonons are absorbed or scattered through the acoustic attenuation coefficient; step 4, calculating a scattering emergence angle theta M1 of the scattered phonons; step 5, continuing to calculate a theoretical ultrasonic attenuation spectrum through a result of the step 4; step 6, establishing an objective function according to the theoretical ultrasonic attenuation spectrum and the experimental measurement ultrasonic attenuation spectrum to solve the particle size and volume concentration. The ultrasonic attenuation spectrum based mixed solid particle size and concentration measurement method can be applied to the two types of mixed solid particles and laboratory scientific research and the online measurement and the application of the industrial field can be implemented.

In dual energy CT, through basis material decomposition (BMD), a pair of density images can be reconstructed. The noises in this image pair are negatively correlated due to the BMD process. A technique is presented for obtaining the monochromatic images at desired energy levels with reduced correlation noise. The technique includes obtaining a plurality of optimum attenuation coefficients for an energy level, selecting a desired energy level, obtaining a plurality of desired attenuation coefficients for the desired energy level, computing a scaling factor for a corresponding noise component based on the optimum attenuation coefficients and the desired attenuation coefficients, and generating a monochromatic image based upon the scaling factor.

The invention provides a LED backlighting power control method and the LED display thereof and is suitable for the LCD field. The method includes steps as following: the power representative value of the LED power supply can be calculated; the power attenuation coefficient can be calculated according to the power representative value; and the power dissipation of attenuation LED power supply can be controlled according to the power attenuation coefficient. In the embodiment of the invention, the power attenuation coefficient can be identified according to the power representative value of each LED, furthermore, LED power consumption can be controlled according to the data value correlative to attenuation coefficient; thereby avoiding the color error phenomenon caused by display pictures, presenting continuous display pictures with high definition and high contrast degree.

Provided are a UV-curable pressure-sensitive adhesive composition comprising a photoinitiator which has a molar absorptivity at 365 nm of at least 1,000 mol⁻¹·cm⁻¹ and the maximum absorption wavelength of at least 420 nm on a long wavelength side; and an adhesive sheet having a layer of the composition disposed over a photo-transmitting base film. The pressure-sensitive adhesive sheet according to the invention can be cured even by exposure to ultraviolet rays at a low intensity or for short time so that it can contribute to energy saving and productivity improvement as a sheet for processing, fixation or surface protection of a semiconductor wafer.

The dual energy X-ray CT apparatus automatically optimizes a map for separation to achieve a high degree of separation accuracy and a reduction of dose.

An X-ray attenuation coefficient acquired in the dual energy X-ray CT system is applied to a map for separation which represents a relationship between the X-ray attenuation coefficient and a composition of an object, thereby separating the composition of the object. The map formation unit for separation calculates an existing probability of each composition for each combination of multiple types of X-ray attenuation coefficients, and determines the composition having the largest existing probability as the composition corresponding to the combination of the X-ray attenuation coefficients, thereby forming the map for separation. This configuration allows a formation of the map for separation with respect to each imaging condition, and high degree of accuracy in separating composition can be achieved.

A contrast phantom for assessing the characteristic, exposure-related signal and noise response and dynamic range of an image recording and detection system. The contrast phantom is composed of an absorber medium having a sudden K-edge absorption change of the mass attenuation coefficient for at least one photon energy level in-between the mean and maximum energies of the lowest energy spectrum it is subjected to. The invention further provides a method for assessing the characteristic, exposure-related signal and noise response and dynamic range of an image recording and detection system with the aforementioned contrast phantom.

The invention discloses a method for confirming the relation between the porosity of CFRP (carbon fiber reinforced plastics) and the ultrasonic attenuation coefficient and belongs to the technical field of ultrasonic non-destructive testing. Firstly, by the aid of an ultrasonic C scanning testing method, an area with the relatively uniform primary bottom surface reflection echo amplitude of a CFRP laminated board is selected as a research object, a metallograph of the area is obtained through continuous microtomy, and an in-situ image containing real morphological pores is acquired with a median filter method and the like. A real morphological pore model is further established with a time-domain finite difference method, the multi-value corresponding relation between the porosity P of the CFRP and the ultrasonic attenuation coefficient alpha is obtained through numerical calculation, and support of experimental data is obtained. By the aid of the method, the multi-value corresponding relation between P and alpha is confirmed firstly, and a more effective model basis is provided for deep elaboration of the ultrasonic attenuation mechanism of the complex morphological pores of the CFRP.

The invention discloses an attenuation coefficient-based method for evaluating the dischargeable electric quantity of a series battery pack, relating to the field of prediction of the discharged electric quantity of the battery packs, and solving the problems that the dischargeable electric quantity of an existing battery pack lacks of test standard and cannot be compared and evaluated. The method comprises the steps: connecting individual batteries of the same type and the same batch in series to form a battery pack; charging and discharging the battery pack to be tested by adopting the same circulation mode; when the attenuation of the dischargeable electric quantity of the battery pack achieves x% of the individual rated capacity, stopping the circulation in the step IV, and recording the number of circulation times as N<battery pack circulation>; selecting the same model and the same batch of individuals in the battery pack and carrying out the same charging and discharging circulation in the step IV, recording the number of circulation times as N<individual circulation> when the dischargeable electric quantity of the battery pack achieves x% of the individual rated capacity, wherein the dischargeable electric quantity coefficient R of the series battery pack is equal to N<battery pack circulation>/N<individual circulation>*100%; and evaluating the dischargeable electric quantity degree of the series battery pack according to the R value. The attenuation coefficient-based method is applicable to the fields of series battery packs of electric vehicles, large-scale energy storage systems and the like.

To provide an optical filter having shielding effects against near ultraviolet rays and near infrared rays. An optical filter comprising a transparent resin body having a single layer or multilayer structure, and containing a near ultraviolet absorbing dye (U) which is a compound represented by the following formula (U) and which has an absorption maximum at a wavelength of from 370 to 425 nm and has a molar absorptivity at the maximum absorption wavelength of at least 50,000 [L/(mol·cm)], and a near infrared absorbing dye (A) which has an absorption maximum at a wavelength of from 600 to 800 nm:

In the formula (U), Y is an oxygen atom, a methylene group or a dimethylene group, R¹ is a monovalent hydrocarbon group which may have a substituent, or the like, R² to R⁵ are a hydrogen atom, an alkyl group, an alkoxy group or the like, and X is a bivalent group represented by any one of the formulae (X1) to (X5) or the like.

The present invention is directed to a new joint estimation framework employing MAP estimation based on pixel-based latent variables for tissue types. The method combines the geometrical information described by latent MRF, statistical relation between tissue types and P-C coefficients, and Poisson noise models of PCD data, and makes possible the continuous Baysian estimation from detected photon counts. The proposed method has better accuracy and RMSE than the method using FBP and thresholding. The joint estimation framework has the potential to further improve the accuracy by introducing more information about tissues in human body, e.g., the location, size, and number of tissues, or limited variation of neighboring tissues, which will be easily formulated by pixel-based latent variables.

The invention provides an attenuation image generation method for PET reconstruction. The method comprises the steps of acquiring an anatomy image and PET data, wherein the anatomy includes a plurality of voxels; acquiring a reference image from a prior data bank and registering the reference image to the anatomy image, wherein the reference image includes prior voxel partitioning information; dividing the anatomy image into a plurality of areas according to the prior voxel partitioning information and allocating attenuation coefficients for the voxels in a plurality of areas to generate a first attenuation image; calculating the registration precision of the anatomy and the reference image, and determining the attenuation value distribution of the voxels in the multiple areas according to the registration precision; updating the first attenuation image iteratively according to the attenuation value distribution of voxels and the PET data to acquire the attenuation estimation of a scanned part. The attenuation value distribution of voxels is introduced in a process of estimating an attenuation coefficient image, so that the attenuation coefficient image estimation is more stable and reliable. The invention also provides a PET image reconstruction method.

The invention provides a damage intensity calculation method and a damage intensity calculation device, and relates to the technical field of shale hydration damage evaluation, wherein the damage intensity calculation method comprises the following steps of obtaining a first sound wave time difference, a first attenuation coefficient, a first maximum vibration amplitude and a first main frequencyof the shale; obtaining a second sound wave time difference, a second attenuation coefficient, a second maximum vibration amplitude and a second main frequency of the shale after the hydration treatment; performing calculation according to the first sound wave time difference, the second sound wave time difference, the first attenuation coefficient, the second attenuation coefficient, the first maximum vibration amplitude, the second maximum vibration amplitude, the first main frequency and the second main frequency to obtain the damage intensity after the shale hydration. By using the method,the problem of lower damage intensity reliability after the shale hydration obtained through the calculation in the prior art can be solved.

The invention relates to the field of evaluation for water body quality, in particular to a model method for estimating diffuse attenuation coefficient of a water body by using OLI (operational land imager) data. The model method is provided for inland waters of China, and green and near-infrared bands of OLI data are selected in the method; water diffuse attenuation coefficient is estimated by using satellite remote sensing data, the defect that conventional detection requires on-site sampling and observation for a ground sample point is overcome, it is possible to quickly acquire diffuse attenuation coefficient of a whole water area, and it is convenient to provide overall evaluation for water body quality spatial differences and water ecological environment.

The invention discloses an attenuation coefficient detection method. The method comprises an amplitude detection step, namely based on a laser vibration measurement principle, respectively detecting sample amplitude data of a tested sample with a preset geometrical shape and a standard sample with a known attenuation coefficient; and an attenuation coefficient determining step, namely calculating the attenuation coefficient of the tested sample according to the sample amplitude data of the tested sample and the standard sample. According to the method, a non-contact laser vibration measurement technology is adopted, measurement errors brought by ultrasonic amplitude and frequency changes caused by change of a coupling layer in a conventional attenuation coefficient detection method are avoided, and the obtained attenuation coefficient result is relatively accurate and reliable.

The invention relates to a composite underwater sound transmission rubber material and a preparation method thereof. A component A is prepared through steps of plasticating natural rubber, then adding into an internal mixer for mixing, adding metallic oxide, inorganic filler, active agent and accelerator for mixing, and discharging sheets by an open mill and testing; a component B is prepared through steps of plasticating chloroprene rubber, then adding into the internal mixer for mixing, then sequentially adding stearic acid, antiager, carbon black, inorganic filler and softener for mixing, adding sulphur for mixing, discharging sheets and cooling down; the composite underwater sound transmission rubber material is prepared through steps of mixing the component A and component B according to proportion of 1:1, packaging into triangle, thinning, discharging sheets, sampling for sulfuration test, and sulfurizing at relatively low temperature. The acoustic impedence of the material and acoustic characteristic impedence of water are well matched, the sound attenuation coefficient of sound wave transmitting in sizing material is low, the material has good hydrolytic resistance and silicone oil resistance; the material can be stored for long time, is safe to operate, has high underwater sound transmission performance, and can be sulfurized at low temperature so that the contradiction between low temperature sulfurization and normal temperature storage is relieved.

An organic dye and preparation method thereof and dye-sensitized solar cells using this organic dye are provided. The structure of the organic dye molecule is donor-conjugated unit(s)-acceptor. The organic dye with broad spectrum response and high molar-absorption coefficient is obtained by modifying the structure by using various conjugated unit(s) in combination with donor and acceptor. The conditions of preparation of the organic dye are mild and the yield is high, and the organic dye can be used for highly effective dye-sensitized solar cells.

The present invention relates to a method for inversing a sea-bottom attenuation coefficient by using a modal dispersion curve energy difference, wherein inversion of a sea-bottom attenuation coefficient is implemented by using amplitude energy information of a modal dispersion curve. The present invention provides a method for inversing a sea-bottom attenuation coefficient by using an energy difference of a modal dispersion curve of two bombs, so as to estimate a sea-bottom attenuation coefficient of an experimental sea area. The method provided by the present invention focuses on inversion of a neritic zone by using a dispersion effect generated by a wide-band explosive sound source during propagation in neritic zones. The method comprises: firstly, placing a receiving hydrophone at a certain depth; then delivering explosive sound sources with the same model number parameter (considered as generating the same signal during explosion) on the same straight line and at different distances, so as to receive time-frequency maps of two explosive sound sources; then processing the time-frequency maps of the two explosive sound sources by using a warping transformation, so as to obtain a transmission energy difference of first four stages of a modal dispersion curve; and finally inversing a sea-bottom attenuation coefficient by using a modal dispersion curve energy difference.

The invention relates to an acquisition method of a PET image attenuation coefficient and a method and system for attenuation correction. Under the circumstance based on regional CT scanning, the CT value of a first sub region, for example, a tone tissue, can be objectively acquired by means of a mapping relationship between the CT value of the CT scanning region and the pixel value of a PET scanning region, and a first attenuation coefficient of the first sub region is quantificationally acquired according to the CT value of the first sub region. Compared with direct assignment on the attenuation coefficient on the first sub region of the bone tissue after image cutting, the result is more accurate and reliable.