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247 results about "Effective height" patented technology

In telecommunication, the effective height, or effective length, of an antenna is the height of the antenna's center of radiation above the ground. It is defined as the ratio of the induced voltage to the incident field .

Feeding mechanism downward movement structure controlled by presser foot lifting mechanism and sewing machine

The invention provides a feeding mechanism downward movement structure controlled by a presser foot lifting mechanism and a sewing machine. The feeding mechanism downward movement structure includes a presser foot lifting wrench, an eccentric shaft rotatably installed in a machine housing, a dental articulator having a second swinging supporting point, and a feeding tooth installed at one end of the dental articulator; a sliding groove is formed in the dental articulator, the eccentric shaft has a shaft body part and a shaft eccentric part eccentrically arranged on the shaft body part, the presser foot lifting wrench is connected with the shaft body part of the eccentric shaft through a first transmission mechanism, and the shaft eccentric part of the eccentric shaft can be rotatably installed in the sliding groove of the dental articulator and cooperated with the sliding groove in a sliding mode; when a presser foot is lifted, the presser foot lifting wrench swings around a first swinging supporting point and swings around the second swinging supporting point through a first transmission mechanism and an eccentric shaft driven dental articulator, so that the end, provided with the feeding tooth, of the dental articulator moves downward to the upper surface of a needle plate, the effective height between the presser foot and the needle plate after the presser foot is lifted is ensured, and therefore a to-be-sewed material is easily delivered between the presser foot and the needle plate before sewing is started.
Owner:JACK SEWING MASCH CO LTD

Electrically enhanced ANAMMOX biologic nitrogen removal method

ActiveCN102336472AEfficient redox processEnhanced and Regulated ReleaseTreatment with anaerobic digestion processesStart timeEffective height
The invention provides an electrically enhanced anaerobic ammonia oxidation reaction method belonging to the technical field of water treatment. The device comprises a cylindrical anaerobic ammonia oxidation reactor, two electrodes are arranged in the anaerobic ammonia oxidation reactor, a tubular iron electrode is used as an anode, a cylindrical graphite electrode is used as a cathode, and the electrodes are connected with an external DC stabilizing power supply through wires. The lengths of the electrodes are 30-40% of the effective height of the reactor, and the lowest inserting positions of the electrodes are 1 / 2 parts of the effective height of the reactor. Under the action of externally applied voltage (optimally, 0.6V voltage and less than 5mA current), the dissolution of iron in the anode is effectively controlled, and the growth of anaerobic ammonia oxidation bacteria is promoted. The results of experiment tests show that the nitrogen removal efficiency of the anaerobic ammonia oxidation bacteria is increased by electrochemical action and coupling in a biologic treatment process, the removal of nitrate nitrogen byproducts in the ANAMMOX process is enhanced, and the device has higher total nitrogen removal efficiency than reference reactors. The starting time of the ANAMMOX technology is shortened, and the total nitrogen removal capability of the ANAMMOX process is effectively improved.
Owner:DALIAN UNIV OF TECH

Multi-grade high-efficiency low-nitrogen combustion method and multi-grade high-efficiency low-nitrogen combustion system for circulating fluidized bed boiler

The invention relates to a multi-grade high-efficiency low-nitrogen combustion method and a multi-grade high-efficiency low-nitrogen combustion system for a circulating fluidized bed boiler. According to the method, combustion air enters a furnace hearth through corresponding inlets respectively to divide the furnace hearth into a less oxygen combustion area, a reduction area, an oxidative combustion area and a burning-out area; the excess air coefficients of each area are respectively controlled to be 0.55-0.95, 0.75-1.15, 1.05-1.25 and greater than or equal to 1.20, so that a fuel is dispersed and uniformly combusted in the furnace hearth. The burning-out area is positioned above the upper boundary of the oxidative combustion area and has the effective height which is not less than 2.5 times of a flue gas average velocity value in the area, the upper boundaries of the remaining areas are respectively 2.0-5.5 meters, 4.5-9.0 meters and 8.0-12.0 meters away from the surface of an air distribution plate. The system which is applicable to the method comprises the furnace hearth, the air distribution plate, a primary air inlet and a secondary air inlet; at least one layer of reducing air inlet, at least one layer of oxidative air inlet and at least one layer of burning-out air inlet are respectively formed in at least one wall of the corresponding area of the furnace hearth. By virtue of the method and the system, the generation capacity of nitrogen oxides can be reduced, and high-efficiency combustion of the fuel can also be realized.
Owner:武汉和信益科技有限公司

UV light emitting diode with double doped multi-quantum well structure

ActiveCN107240627AImprove luminous efficiencySlow down or even eliminate tiltSemiconductor devicesElectron holeQuantum well
The invention discloses a UV light emitting diode with double doped multi-quantum well structure, which comprises the following elements arranged from the bottom to the top in a successive manner: an AlN intermediate layer, an un-doped AlGaN buffer layer, an n-type AlGaN layer and a double doped AlxGa1-xN / AlyGa1-yN multi-quantum well passive area, an AlzGa1-zN electron blocking layer with z greater than y and y greater than x, a p-type AIGaN layer and a transparent conductive layer. On the n-type AlGaN layer and the transparent conductive layer are provided with an n-type Ohmic electrode and a p-type Ohmic electrode respectively. The beneficial effects of the present invention are as follows: a compensation electric field in opposite polarized electric field direction can be formed, which, on one hand, reduces or even eliminates the energy band inclination of the quantum well, increases the effective height of the quantum well barrier layer, increases the uniform distribution of carriers especially in the multi-quantum well structure and, on the other hand, increases the overlapping of the electrons in the quantum well with the wave function in space and increases the radiation composite efficiency of the electrons and the electron holes, therefore raising the UV-LED luminance efficiency substantially.
Owner:SOUTHEAST UNIV

Method for treating waste water containing salt through coupling of electrodes and anaerobic organisms

The invention provides a device for treating waste water containing salt through coupling of electrodes and anaerobic organisms, which comprises a cylindrical anaerobic reactor, the lower part of the anaerobic reactor is provided with a water distributor, the middle is provided with an anode and a cathode and connected with an external power supply through a wire, the upper part is provided with a three-phase separator, and the external is provided with a thermal insulating layer. The anode and the cathode are coaxially inserted into the 1/4 part of the effective height of the reactor, the lengths of the anode and the cathode are 50% of the effective height of the whole reactor, and externally applied voltage is optimally 1.2V. In the technology, iron-carbon electrodes are arranged in the anaerobic reactor for treating waste water containing salt with a high electricity conducting rate, the activity of anaerobic microorganisms is enhanced under the coupling action of an electric field and ferrous ion release, and the dwelling time of sludge in the reactor is prolonged, so that the metabolism speed of the microorganisms is raised, and the biomass is increased. The device is favorable to sieving efficient halophilic microorganisms, is used for treating high concentration of organic waste water containing salt, and has remarkable innovation, good effect for treating the waste water and good application prospect.
Owner:DALIAN UNIV OF TECH

Variable stiffness anti-impact steel wire rope vibration isolator

InactiveCN102927185AAchieving three levels of shock isolationShock absorbersVariable stiffnessEffective height
The invention discloses a variable stiffness anti-impact steel wire rope vibration isolator and relates to the field of impact vibration isolation of electronic equipment. The variable stiffness anti-impact steel wire rope vibration isolator comprises a lower bottom plate (1), an upper bottom plate (2), a steel wire rope (3) and n groups of variable stiffness modules (G), the steel wire rope (3) is wound outside the upper bottom plate (2) and the lower bottom plate (1), and the n groups of the variable stiffness modules (G) are formed by anti-compression spiral springs (4) and rubber guide columns (5). The height h2 of the anti-compression spiral springs (4) is smaller than the effective height H of the variable stiffness anti-impact steel wire rope vibration isolator. The height h3 of the rubber guide columns (5) is greater than one half of the effective height H of the variable stiffness anti-impact steel wire rope vibration isolator. The variable stiffness anti-impact steel wire rope vibration isolator is simple and compact in structure, and capable of achieving variable stiffness function and variable inherent frequency characteristic in the process of impact vibration isolation. Meanwhile, the variable stiffness anti-impact steel wire rope vibration isolator has wide application prospect on an occasion with high large impact requirement.
Owner:CHANGZHOU UNIV
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