89results about How to "Reduce attenuation" patented technology

An antenna structure capable of determining the direction of a radiofrequency identification (RFID) tag includes a wide-angle antenna disposed within an attenuator that has regions of low attenuation. The attenuator may include a metal plate with holes. In this case, the antenna only detects RFID tags that are aligned with a hole, and hence the direction of the RFID tag is detected. Multiple holes of different sizes can be provided. In this case, if the RFID tag is moving, the direction and speed of movement can be determined from the duration of received RFID signals. For example, a long period of RFID tag signal reception indicates that the tag passed in front of a large hole in the attenuator. The present invention is particularly well suited for use with conveyor belts and in applications where RFID tags move along known paths.

An optical circuit is provided having a plurality of legs, each of which may have one or more optical fibers bound together by a matrix material, arranged in a stacked configuration in such a manner as to reduce, if not eliminate, the stress to which the optical fibers are subjected. The optical circuit includes a main body having a flexible substrate and a plurality of optical fibers mounted upon the substrate and lying in a common plane. The plurality of legs extend outwardly from an edge of the main body. The legs are disposed in a stacked configuration in which at least one leg overlies another leg. As such, at least one leg lies at least partially outside of the common plane defined by the substrate. A method for fabricating the optical circuit is also provided.

A wireless wastewater system monitoring apparatus generally comprising a processor/transceiver unit, housed within a synthetic protective enclosure formed outside of the wastewater system, and a fluid level sensor configured to send an overflow signal to the processor/transceiver unit when an overflow condition in the wastewater system is detected. The processor/transceiver unit is configured with at least one microprocessor wired between the sensor and a power supply and with a transceiver so as to detect the overflow signal from the sensor and, in response, transmit a wireless alarm signal. The processor/transceiver unit is further configured such that only a portion of its circuitry is constantly powered so as to continuously monitor the sensor, while the remainder of its circuitry, including the transceiver, is only powered and a wireless signal sent from the unit when an overflow condition is detected or a routine status-check is being conducted.

Support devices and pods for the head and neck region of patients undergoing radiation therapy are provided herein. The pod generally includes a support shell shaped to generally conform to the shape of the head and neck region of the patient, a foam insert that conforms to the head and neck region of the patient, and an immobilization facemask attached directly to the shell, thereby facilitating close placement of the radiation beam delivery device to the patient and reducing any attenuation and perturbation of radiation doses directed at the patient. The components of the pod are made from materials having properties that reduce any attenuation and perturbation of prescribed radiation doses.

The invention relates to a method for manufacturing a large-diameter low-water peak optical fiber mandril through a high-deposition rate PCVD process, which comprises the following steps that: after a pure quartz liner with the outer diameter of 36 to 65mm is corroded and cleaned, PCVD processing is carried out; the pure quartz liner is arranged in a microwave resonant cavity heat insulation furnace, a microwave resonant cavity has axial reciprocating movement relative to the pure quartz liner, the movement speed is 15 to 30m/min, and the high-frequency power is 5.5 to 20.5kW; the deposition rate in the liner is 2.5 to 5.0g/min, and the single-layered deposition thickness is 1.0 to 3.0mu m; and after the deposition, an electric fusion shrink lathe shrinks to prepare the solid optical fiber mandril, the outer diameter of the mandril is 30 to 61mm, the diameter ratio of a cladding core layer b/a is more than or equal to 1.2 and less than 3.0, and the ratio of the outer diameter of the mandril to the diameter of the core layer c/a is more than or equal to 3.8 and less than 6.0. The method for manufacturing the large-diameter optical fiber mandril through the PCVD process not only has convenient manufacturing process and high deposition rate, but also can meet the design requirement on the diameter ratio of the cladding core layer in a wider scope and the optical fiber performance requirements on low water peak and low attenuation.

A core part of a multimode optical fiber including the core part and a cladding part has a structure composed of a plurality of concentric layers in which a refractive index is decreased stepwise from a first core layer as an innermost layer to a third core layer as an outermost layer. The structure having the plurality of layers is formed by adjusting a quantity of addition of fluorine to silica glass. Fluorine is added to the cladding part so that a refractive index is lower than that of the third core layer as the outermost layer of the core part.

A transmission line cable that utilizes a plurality of substantially flat insulated conductors, each consisting of two or more solid metallic strands laid side by side in a parallel configuration within an extruded insulator. The plurality of insulated conductors are stacked into groups of two or more and may be utilized as signal conductors or shield conductors. Once the insulated conductors are stacked, the stack is twisted together, and either wrapped in a conductive insulator, placed in an extruded non-conductive insulator, or both, creating a cable that is stable, flexible, and has improved transmission characteristics, including reduced attenuation, noise and signal skew.

The waveguide structure of single-mode optical fibre comprises layered fibre core and layered clad. The fibre core is set with two core layers in different refractive indexed and layered clad consists of five layered clads. The codeposition of fluorine and germanium is applied by utilizing PCVD process to replace independent deposition of fluorine or germanium in deposition process for fibre core and clad so optical, mechanical and environmental performance of optical fibre is very much improved. The single-mode optical fibre produced in the present invention can be used in transmission of DWDM system.

The invention relates to an integrated magnetic elasticity sensor, belonging to the technical field of micro electro mechanical systems. The integrated magnetic elasticity sensor comprises a glass substrate, a magnetic field excitation offset coil, a signal reception coil, a sensor support, a magnetic belt material and insulation material layers. The magnetic field excitation offset coil is located on the glass substrate; the signal reception coil is located above the magnetic field excitation offset coil; the sensor support is located above the signal reception coil; the insulation material layers are respectively located among the magnetic field excitation offset coil, the signal reception coil and the sensor support; and both ends of the magnetic belt material are fixed on the sensor support. The invention has the advantages of high processing precision and small size of the device, can eliminate background signals of the excitation signal in the reception coil by adopting an 8-shaped collection coil, realizes real-time monitoring of vibration signals and can realize the portable characteristic.

A transmission line cable that utilizes a plurality of substantially flat insulated conductors, each consisting of two or more solid metallic strands laid side by side in a parallel configuration within an extruded insulator. The plurality of insulated conductors are stacked into groups of two or more and may be utilized as signal conductors or shield conductors. Once the insulated conductors are stacked, the stack is twisted together, and either wrapped in a conductive insulator, placed in an extruded non-conductive insulator, or both, creating a cable that is stable, flexible, and has improved transmission characteristics, including reduced attenuation, noise and signal skew.

The invention provides a preparation method of a modified lithium ion battery positive electrode material, and belongs to the technical field of lithium ion battery positive electrode materials. Firstly, a hydroxide composite precursor containing nickel, cobalt and manganese is prepared; Mixing the composite precursor with lithium hydroxide, and carrying out high-temperature sintering to obtain alithium ion battery positive electrode material; And finally, performing surface amorphous fast ion conductor coating modification on the obtained positive electrode material to obtain the lithium ionbattery positive electrode material with excellent performance. The surface of the modified lithium ion battery positive electrode material is coated with a layer of amorphous compound, so that the side reaction of an electrolyte and an active substance is favorably reduced, and the cycle performance of the positive electrode material is obviously improved. The process is simple and easy to implement, has low requirements on raw materials and equipment, has better product stability and meets the requirements of high-performance power battery materials. Good economic benefits and good market promotion values are achieved.

The invention provides an optical fiber fusion and distribution integrated unit disc, and belongs to an optical fiber fusion and distribution part. The optical fiber fusion and distribution integrated unit disc comprises a cover plate and a unit disc body. The unit disc body comprises a fusion part in the upper layer and a tail fiber coiling part in the lower layer. A plurality of fiber winding-unwinding structures used for coiling tail fibers are arranged in the tail fiber coiling part, each fiber winding-unwinding structure is formed by detachably connecting a plurality of fiber winding-unwinding discs, and the fiber winding-unwinding discs of each fiber winding-unwinding structure are stacked in the vertical direction. The optical fiber fusion and distribution integrated unit disc can be used as a distribution unit disc in an optical cable splice box, and in the optical cable splice box, the tail fibers can be directly connected with an adapter of a standard main unit disc through the tail fibers. Attenuation in the whole light path process is effectively reduced, the network quality is improved, and obstacle points caused by connecting the optical fibers with the adapter are reduced. In addition, the tail fibers in the optical fiber splice box can be orderly and tidily arranged, and disordering of the tail fibers can be avoided.

The invention relates to a single mode fiber with the lower manufacturing cost. The single mode fiber comprises a core layer, wherein a first inner wrapping layer, a second inner wrapping layer and an outer wrapping layer wrap the core layer in sequence. The single mode fiber is characterized in that the outer wrapping layer is made of natural siliceous sand, the absolute refraction index of the outer wrapping layer ranges from 1.4572 to 1.4574, the diameter alpha of the core layer is 8-10 micrometers, the refraction index difference delta n1 of the core layer and the outer wrapping layer ranges from 4.1*10<-3> to 6.4*10<-3>, the ratio b/a of the diameter b of the first inner wrapping layer to the diameter a of the core layer is greater than or equal to 1.6, the refraction index difference delta n2 of the first inner wrapping layer and the outer wrapping layer ranges from -2.4*10<-3> to -0.7*10<-3>, and the ratio c/a of the diameter c of the second inner wrapping layer to the diameter a of the core layer is greater than or equal to 3.6. The outer wrapping layer of an optical fiber prefabricated bar is made of the natural siliceous sand with the lower cost, so that the manufacturing cost of the optical fiber is lowered greatly; the structure of the inner wrapping layers and the outer wrapping layer is adopted, the ratio of the inner wrapping layers to the core layer is selected reasonably, and the fluorine mixing amount and the chloride ion concentration in the second inner wrapping layer are controlled, so that influence on optical attenuation from the impurities of the outer wrapping layer made of the natural siliceous land is reduced, and the water peak performance and the attenuation coefficient of the single mode fiber are reduced effectively.

The invention discloses a camera module testing method, a camera module testing device and a computer readable storage medium, wherein the camera module testing method comprises the steps of: respectively performing resolution power testing of imaging points of N pre-set positions in a current test image; continuously applying pre-set pressure on the lens and/or the holder of a camera assembly in a resolution power testing process; adjusting the position of the lens in the holder, and returning to the resolution power testing step and the subsequent step till the target position of the lens in the holder is searched, wherein when the lens is at the target position in the holder, the resolution power testing value of the imaging point at the pre-set position in the N pre-set positions is maximum; and fixing the lens at the target position in the holder when the target position is searched. By means of the technical scheme provided by the invention, the resolution power attenuation degree of a camera module after being assembled on electronic equipment can be effectively reduced.

A seed composition comprising a seed and a first component comprising an agriculturally acceptable complex mixture of dissolved organic material characterized by natural organic matter that is partially humified and methods of seed treating. A method comprising contacting a seed with a first component comprising an agriculturally acceptable complex mixture of dissolved organic material characterized by natural organic matter that is partially humified, where the first component enhances at least one of germination, emergence, root development, seedling vigor, seedling growth, mortality resistance, chlorophyll production, cold resistance, water log resistance, and nutrient uptake compared to similar seed not contacted with the first component.

The invention relates to a composite semi-conductor integrated circuit with a three-dimensional element. In the composite semi-conductor integrated circuit, a welding pad or an inductor is arranged above an electronic element in a three-dimensional mode. The thickness of a dielectric layer inserted between the welding pad or the inductor and the electronic element ranges from 10 microns to 30 microns, so that influence on the performance of the element caused by the structure is effectively reduced. A protective layer can be coated on the electronic element to prevent pollution from metal materials making the welding pad or the inductor, and therefore, relatively cheap copper can be used for making the welding pad and the inductor. The three-dimensional welding pad can be applied to a wire bonding technology or a lug bonding technology.

The embodiment of the invention discloses a positron emission computer tomography detector device. The device comprises a silicon semiconductor detection array, wherein the silicon semiconductor detection array comprises a plurality of silicon semiconductor detection units; the cathodes of the plurality of silicon semiconductor detection units are connected with a power supply; the anodes or the cathodes of the plurality of silicon semiconductor detection units are taken as first signal output ends which are connected with corresponding time detection circuits; the number of the time detectioncircuits is more than 1 and is smaller than or equal to the number of the first signal output ends, by reducing the number of the silicon semiconductor detection units connected to the same time detection circuit, the capacitance effect of the silicon semiconductor detection units for collecting pulse signals is weakened, thus the attenuation degree of the high-frequency part in the pulse signalsis reduced, and the detection accuracy for gamma photon receiving time is improved.

The invention discloses a method for measuring the water content of soil by adopting a time length measurement technology in the field of measurement for the water content of soil, which aims at solving the problems of conventional researches in the field of measurement for the water content of soil. The method comprises the following steps of firstly, inserting a double-V soil probe into prepared soil to be measured; secondly, transmitting a high-frequency electromagnetic wave to the soil probe; thirdly, comparing the phase difference of the electromagnetic waves at a transmitting end and a receiving end to accurately calculate the transmission time of the electromagnetic waves in the probe, and finally calculating the water content of the soil according to a fitting formula of a relationship between the transmission time and the water content of the soil. According to the method, the limits of complexity, low accuracy, difficulty in the implementation of a hardware circuit and the like of a conventional soil water content measurement method in practical application are broken, and the method for measuring the water content of the soil by adopting the time length measurement technology is effectively implemented.

The invention discloses a 3G (third-generation) broadband digitalized super-remote wireless transmission system, which comprises a near terminal, a remote terminal and a WCDMA (wideband code division multiple access) data card. The near terminal is communicated with the remote terminal through a relay antenna, the transmission frequency of the relay antenna adopts an intermediate frequency bandwidth, and the information transmission between the WCDMA data card and a service station is performed through a service antenna. Based on the WCDMA interface standard, the near terminal is installed on the existing base station, and the remote terminal is installed on a service tower in remote areas, so that the super-remote transmission of wireless communication is realized, the problem of 3G broadband access in the remote areas can be solved without cable laying, and the coverage rate of wireless network signals in hilly, mountainous and woodsy areas is increased.