107 results about "Absorption (electromagnetic radiation)" patented technology

Herein is described Nanostructure Enhanced X-ray Therapy (NEXT), which uses nanomaterials as radiosensitizers to enhance electromagnetic radiation absorption in specific cells or tissues. The nanomaterial radiosensitizers emit Auger electrons and generate radicals in response to electromagnetic radiation, which can cause localized damage to DNA or other cellular structures such as membranes. The nanomaterial radiosensitizers contain moieties for specific targeting to molecules or structures in a cell or tissue, and can be functionalized for increased stability and solubility. The nanomaterial radiosensitizers can also be used as detection agents to help in early diagnosis of disease. Together with known techniques such as Computed Tomography or Computerized Axial Tomography (CT or CAT scan), these nanomaterial radiosensitizers could allow early diagnosis and treatment of diseases such as cancer and HIV.

A system for detecting ice or water within an area of interest having a detection system measuring radiance or reflectance of the area of interest when exposed to shortwave infrared radiation having a wavelength in the range containing a crossover point between the curves representing the absorption of electromagnetic radiation by ice and water. The detection system measures the radiance or reflectance in a first band having a wavelength in a spectral band on a first side of the crossover point and outputting a first band signal, and further measures the radiance or reflectance in a second band having a wavelength in a spectral band on a second opposing side of the same crossover point and outputting a second band signal. A processing unit determines a ratio of the first band signal and the second band signal and compares the ratio to a predetermined critical ratio and outputs a determination signal indicating presence of ice or water.

The invention discloses a flexible material with nuclear radiation protection and electromagnetic shielding functions, and a preparation method and application thereof. The flexible material comprisesfour functional layers, namely an electromagnetic radiation absorption layer, a first ray radiation shielding layer, a neutron radiation shielding layer and a second ray radiation shielding layer insequence from outside to inside, wherein each functional layer comprises a polymer base material and a functional filler. According to the flexible composite gradient material, lead powder is not added; the defects that a traditional homogeneous blending material is limited in functional filler filling amount, easy to disperse unevenly, low in material comprehensive performance and the like are overcome; and meanwhile, the weak absorption region of elemental lead in an energy interval of 40-88 keV can be effectively compensated by adopting a compounding ratio of the functional filler, so the material has excellent X-ray, gamma-ray and neutron radiation shielding performance and electromagnetic radiation absorption performance.

The invention provides a preparation method of a chitosan modification barium ferrite filling multi-walled carbon nanotube/poly 3-methylthiophene composite wave-absorbing material. The method utilizes a carbon nanotube as a raw material, after the carbon nanotube is filled with barium ferrite, chitosan is coated on the carbon nanotube for modification, and then the carbon nanotube is composited with poly 3-methylthiophene to obtain the novel wave-absorbing material integrating magnetic loss, electrical loss and carbon nanotube wave absorption. Requirements for being thin, light, wide and strong of the wave-absorbing material are met. Therefore, the composite wave-absorbing material has wide application prospect in aspects of microwave absorption, electromagnetic radiation resistance and the like.

The present invention relates to photochromic materials that include certain indeno-fused naphthopyrans. The indeno-fused naphthopyrans have an amino group (e.g., a piperidino or morpholino group) bonded to the 6-position and an optional halo group (e.g., fluoro) bonded to the 11-position thereof. The photochromic materials of the present invention may have a closed-form electromagnetic radiation absorption spectrum that is shifted to longer wavelengths (e.g., wavelengths of greater than 390 nm), relative to comparable photochromic materials. The present invention also relates to optical elements, such as eyeglasses, that include the photochromic materials of the present invention.

A method and apparatus for producing a radio frequency absorbing (RFA) or perfect microwave absorbing (PMA) printed circuit board (PCB) is described herein. A metamaterial layer may be applied to a low dielectric substrate. Resistive and capacitive components may then be added to the metamaterial layer. The metamaterial layer may then be formed into an RFA or PMA PCB, which may comprise a multi-layered assembly for absorption of electromagnetic radiation in a targeted frequency range such as the microwave frequency range in the PCB.

The invention discloses a scale-free and radiation-free technology of an intelligent electromagnetic energy water heater. Heating is carried out in a high-frequency electromagnetic induction manner, and electricity is saved by 1/4 or near 1/3 compared with a common electric heating tube water heater. As heating coils are not in contact with water, the combustible-gas inflammable possibility, the combustible gas explosive possibility and the carbon monoxide poisoning possibility can be avoided, and therefore safety is quite high. After several years of long-term experimenting, the working frequency and the waveform of the water heater are changed, and scale is effectively eliminated; the water temperature can be controlled to the accurate temperature with the temperature error of +/-0.5 DEG C through the PID adjustment technology and the self-adaptive technology; multiple intelligent technologies such as various intelligent functions including WiFi, voices, a Bluetooth network, a wireless panel and the like are adopted; the water-cooling cooling technology of a water inlet tank is used, and therefore stable work of a high-power electronic device is guaranteed; and a shell is made of a flame-retardant and insulating material, the interior is made of an anti-radiation material, the resistance-capacitance absorption technology is adopted for the interior, and the electromagnetic radiation value is reduced to be zero. The electromagnetic-energy, radiation-free and scale-free technology is suitable for water heaters, induction cookers, water dispensers, winter heating and the like, and can be further applied to hospitals, touring, civil boilers and industrial boilers, and the market is quite large.

A double or multi- layer apparatus or device for optical anti-Stokes cooling of object surfaces. The apparatus comprises at least one bottom layer, which is configured to respond in anti-Stokes fluorescence upon absorption of electromagnetic radiation and at least one top layer, which is overlaid on the bottom layer and configured to filter the electromagnetic radiation and transmit selected spectral band of the electromagnetic radiation to the bottom layer. The active cooling does not depend on the coherent nature of the radiation, which enables the usage of incoherent solar radiation as theactive cooling input power source. The cooling technology of the invention is suitable for small and large scales and practically for any object with surface on which the layer substance can be applied or overlaid, e.g., roof, wall, car, ship, tent, clothing, etc.

The invention relates to a preparation method of an absorption type flexible transparent electromagnetic shielding film and a product, and belongs to the technical field of electromagnetic shielding.The preparation method comprises the following steps of sequentially coating and preparing the flexible transparent polymer film layer I, the ferromagnetic nanowire network structure layer and a flexible transparent polymer film layer II on a cleaned substrate, and applying a magnetic field to enable the ferromagnetic nanowires to be distributed to form an ordered network structure when the ferromagnetic nanowire network structure layer is coated and prepared. The shielding film prepared by the method is high in shielding effectiveness, high in light transmittance, good in flexibility and excellent in electromagnetic wave absorbing capacity, the secondary electromagnetic radiation pollution caused by the shielding mainly based on a reflection mechanism can be effectively avoided, the shielding film has good engineering application potential, and the preparation method is simple, is low in raw material cost, and is easy to operate and industrialize.

The invention relates to a device and to a method for continuously measuring the hydrogen sulfide concentration of an off-gas by means of a detachable device suitable for being temporarily connected to equipment producing the off-gas. The method comprises a step of measuring the absorption of electromagnetic radiation by the off-gas. The device and method method can be used in particular to measure the hydrogen sulfide concentration in an off-gas produced during a step of sulfiding a hydroprocessing catalyst.

A thermal pixel configured as an electromagnetic emitter and/or an electromagnetic detector. The thermal pixel comprises a micro-platform suspended with semiconductor nanowires from a surrounding support platform. The nanowires comprise phononic structure providing a decrease in thermal conductivity. In some embodiments, the pixel is structured for operation within a broad bandwidth or a limited bandwidth. Metamaterial and/or photonic crystal filters provide pixel operation over a limited bandwidth. In some other embodiments, the micro-platform comprises a nanotube structure providing a broadband emission/absorption spectral response.

The invention discloses a high-performance electromagnetic radiation suppression structure. Metamaterial wave-absorbing bodies which are arranged periodically are added between a heat dissipation cover and a PCB, meanwhile, a graphene resistive surface is added, a shielding effect is improved, electromagnetic radiation suppression of a needed frequency band is achieved, each metamaterial wave-absorbing body is composed of a top-layer resonance unit, a lossy dielectric layer and an all-metal back plate, the metamaterial wave-absorbing bodies are arranged below the heat dissipation cover, a certain distance is kept between the metamaterial wave-absorbing bodies and the PCB, the position of a heat-conducting glue is reserved in the middle, and the graphene structure is loaded above the heat-conducting glue so that direct upward radiation leakage of chip packaging is effectively inhibited. The structure is suitable for electromagnetic radiation suppression of a packaging device, the introduction of the metamaterial structure realizes the characteristics of miniaturization, polarization insensitivity and the like of the shielding structure, and a good radiation absorption capability in a working frequency band is possessed. And the structure has a huge application value in a packaging design of chips, PCBs and the like.