141results about How to "Reduce pump power" patented technology

Disclosed is an amplifying optical fiber having a central core and an optical cladding surrounding the central core. The central core is based on a silica matrix that includes nanoparticles, which are composed of a matrix material that includes doping ions of at least one rare earth element. The amplifying optical fiber can be employed, for example, in an optical amplifier and an optical laser.

An optical parametric oscillator (OPO) is described that efficiently converts a near-infrared laser beam to tunable mid-infrared wavelength output. In some embodiments, the OPO includes an optical resonator containing a nonlinear crystal, such as periodically-poled lithium niobate. The OPO is pumped by a continuous-wave fiber-laser source having a low-power oscillator and a high-power amplifier, or using just a power oscillator). The fiber oscillator produces a single-frequency output defined by a distributed-feedback (DFB) structure of the fiber. The DFB-fiber-laser output is amplified to a pump level consistent with exceeding an oscillation threshold in the OPO in which only one of two generated waves (“signal” and “idler”) is resonant within the optical cavity. This pump source provides the capability to tune the DFB fiber laser by straining the fiber (using an attached piezoelectric element or by other means) that allows the OPO to be continuously tuned over substantial ranges, enabling rapid, wide continuous tuning of the OPO output frequency or frequencies.

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.

The invention disclosed a mixed-mode fuel injector with micro-variable-circular-orifice (MVCO), which is a fuel injection device for internal combustion engines, either diesel or gasoline engines. The fuel injector is a high-accuracy couple of components comprising a needle valve (1) and a nozzle body (5). Said needle valve is movable back and forth and received in said nozzle body to provide an opening position for fuel injection and a biased closing position. Said nozzle body has multiple-micro-channels (6) on the inner conical surface (C) close to the tip of the nozzle body. The injector has a MVCO (4) comprising a micro-variable-circular aperture and multiple-micro-channels, and has means of generating variable mixed-mode sprays of conical and multi-jet shapes, with a major homogeneous conical spray at low to medium injection loads.

Method and apparatus for cooling a fuel cell stack. The cooling system uses vaporization cooling of the fuel stack and supersonic vapor compression of the vaporized coolant to significantly increase the temperature and pressure of the liquid coolant flowing through a heat exchanger. By increasing the heat rejection temperature of the coolant delivered to the heat exchanger, the heat transfer area of the heat exchanger can be reduced and the mass flow rate of coolant can also be reduced. The increased fluid pressure is used to circulate the coolant through the cooling system, thereby eliminating the circulation pump associated with conventional systems.

A device for, and a method of, generating stimulated emission of microwave or radio frequency electromagnetic radiation, utilize a resonator structure, an input source of microwave or radio frequency electromagnetic radiation to be amplified, and an input of energy arranged to pump the resonator structure and thereby cause amplification of the electromagnetic radiation. The configuration of the resonator structure and/or the materials used in its construction give rise to an increase in the magnetic Purcell factor of the resonator structure.

A hydraulic system in motor vehicles with at least one hydraulically actuated clutch, which entails minimized control complexity for supplying the clutch with hydraulic oil and which takes up less structural space. These characteristics are achieved essentially in that the pressure control of the hydraulically actuated clutch is effected directly and exclusively by an electrically driven and electronically controlled oil pump.

The invention provides an exhaust steam direct-absorption type lithium bromide heat pump system which comprises an absorber, wherein a low-temperature exhaust steam pipeline is externally connected to the absorber; a liquid outlet of the absorber is communicated with a generator which is internally provided with a condenser through a dilute solution pipeline and then is connected with a liquid inlet through a concentration solution pipeline; a heating pipeline is connected to the generator; the heating pipeline is outputted through the generator and a steam-driving draining pipeline; a heat network pipeline is connected to the absorber, sequentially passes through the absorber and a heat exchange tube in the condenser of the generator and then is outputted; and a liquid outlet of the condenser is communicated with a steam condensation water pipeline for outputting exhaust steam and draining. According to the exhaust steam direct-absorption type lithium bromide heat pump system disclosed by the invention, two links of heat exchange of the exhaust steam and circulating water and heat release of the circulating water in an evaporator in a heat pump are omitted, so that the heat pump system is greatly simplified and the system investment is reduced. Meanwhile, the pulsation of the circulating water is saved and the operation cost is reduced. In addition, two intermediate heat exchange processes are omitted, so that the irreversible loss of the system is reduced and the performances of the system are greatly improved.

A method, optical module, and optical amplifier are configured to detect fiber discontinuities at or near a port from which high powered optical signals are input into a fiber span. These fiber discontinuities can include fiber pinches, and are detected by monitoring for slight changes in a backscatter signal. Detection is quick and efficient based on the backscatter signal being attenuated by the fiber discontinuities twice, namely once as the high powered optical signals and again as the associated backscatter signal of the high powered optical signals returning to the port. Various remedial actions can be taken upon detecting fiber pinches at or near the port.

This invention discloses a natural gas hydrate underwater heat injection exploitation device, which contains compressor, evaporator, condenser, expansion valve, booster pump, flooding duct, wherein the compressor, evaporator, condenser and expansion valve combined a heat pump, by which absorbing heat from sea water at about 5 degree centigrade, vaporizing refrigerant in evaporator, entering compressor to boost pressure entering condenser to release heat to heat sea water, the heated water pressured by booster pump, entering exploitation sleeve and added with hydrate layer for decomposition of hydrate. Said invention can be used in sea bed with high thermal efficiency.

The invention relates to a multiple-starting liquid oxygen kerosene engine of a gas driven preloading turbine. The multiple-starting liquid oxygen kerosene engine solves the problems that an oxygen-rich afterburning circulating liquid oxygen kerosene engine has no capacity of being started under low inlet pressure and can not being started for multiple times. The liquid oxygen kerosene engine comprises a gas system, a liquid oxygen system, a fuel supply system, an ignition agent supply system and a starting system. The ignition agent supply system comprises an ignition agent starting box, an ignition agent supply valve, a third one-way valve, a generator fuel valve and a fourth one-way valve. The generator fuel valve is a two-position three-way valve and comprises an inlet, an outlet A andan outlet B. The starting system comprises a high-pressure gas supply device, a high-pressure gas one-way valve, an oxygen preloading pump, an oxygen preloading turbine, a switching valve, a liquid oxygen one-way valve and a mixer. The ignition agent starting box of the liquid oxygen kerosene engine is relatively independent, an ignition agent is supplied to fuel gas generator and the thrust chamber for multiple times, and therefore the engine has the capacity of being started for multiple times.

The invention provides a pump-driven two-phase circuit device for heat dissipation of a high heat flux electronic device. Heat is collected and transported by using an endothermic process in evaporation and an exothermic process in condensation during a circulation flow process of a working medium. An evaporator for the circuit device comprises micro-channels and fins. In an area of high heat flux, the micro-channels are used to dissipate heat and increase a heat transfer coefficient of a partial area, while in an area of low heat flux, the fins are used. Due to great area difference between the micro-channel area and the fin area in the evaporator, when the working medium in the micro-channels enters the fin area, volume quickly expands and temperature of the working medium reduces, so as to help heat dissipation of the device in the fin area. By using different structures and with little resources, heat dissipation problems of devices with different powers are solved. The pump-driven two-phase circuit device for heat dissipation of the high heat flux electronic device can adapt to heat dissipation of electronic devices with different heat flux densities and can satisfy working requirements of electronic devices with a heat flux density of 50 W/cm<2> or above.

A cooling device with small structured rib-dimple hybrid structures, comprising a substrate, a cooling channel, a plurality of small structured ribs and a plurality of dimples. The cooling channel, the plurality of small structured ribs and the plurality of dimples are all disposed on the wall surface of the substrate; the plurality of dimples are in a staggered arrangement or in a longitudinal arrangement, forming a dimple array; an upstream wall surface of each dimple or a plurality of dimples is provided with the small structured ribs, thus forming an small structured rib-dimple hybrid structure.

The present invention provides a swept fiber optic laser source for optical coherence tomography emitting around ˜1060 nm wavelength, with tuning range higher than 50 nm, sweep repetition rate from DC to 40 kHz, instantaneous linewidth shorter than 50 pm (FWHM), and providing an average output around 1 mW (or 20 mW with output optical booster amplifier). The fiber laser source is based on a proper linear-cavity fiber laser configuration, with an intra-cavity half-symmetrical confocal Fabry-Perot tunable fiber (FP-TFF) filter and semiconductor optical amplifier (SOA), a device combination that gives a very robust and vibration-resistant laser configuration.

The invention discloses a variable component multi-pressure evaporation non-azeotropic refrigerant Rankine cycle system with an ejector. The variable component multi-pressure evaporation non-azeotropic refrigerant Rankine cycle system comprises an expander, a circulating pump, an evaporator, a condenser and the gas-liquid ejector. A working fluid outlet of the expander is connected with a workingfluid inlet of the gas-liquid ejector, and an exhaust steam outlet of the expander is connected with the condenser. A pipeline is arranged on the middle portion of the condenser and connected with a low-pressure ejection fluid inlet of the gas-liquid ejector, and the condenser is connected to a mixed refrigerant inlet of the evaporator through the circulating pump. A mixed refrigerant outlet of the evaporator is connected to an inlet of the expander. A high-boiling-point high-pressure liquid outlet of the gas-liquid ejector is connected with the mixed refrigerant inlet of the evaporator. The system has a simple structure, high work efficiency and energy saving and environmental protection.

The invention relates to the technical field of a water cooling system in power electronics, in particular to a novel water pipe structure for a high voltage direct current converter valve. The water pipe structure comprises a water inlet, a saturated reactor, a thyristor radiator, a damp resistor and a water outlet; the water pipe structure is formed by connecting three independent cooling branches of a first branch, a second branch and a third branch in parallel; and each of the independent cooling branches is connected with each other in series. In the invention, the direct current converter valve is designed into a mixed distribution way of parallel and series connection; through reasonably matching flow resistance and thermal resistance of thermal elements, under the condition of acquiring excellent heat exchange conditions, the flowing resistance of the a water system is increased a little; simultaneously, the water system has excellent electric insulated property; the number of water joints is reduced; and the leaking probability is reduced.

The invention discloses a manufacturing method of glucose, comprising the following steps of: (1) liquefying starch: by taking starch as the raw material, liquefying under the action of a liquefying enzyme after size mixing, and then, a glucose saccharified liquid under the action of a saccharifying enzyme; (2) filtering and decontaminating the saccharified liquid by a membrane filtering unit to obtain filtrate, wherein a filtering membrane has the aperture of 1-200nm or the molecular weight cut-off of 10-500kd; (3) carrying out continuous ion exchange on the filtrate by using a moving bed, removing salts to obtain a purified liquid; and (4) filtering the purified liquid by using a nanofiltering membrane to obtain pharmaceutical-grade glucose, wherein a concentrated solution is used for producing daily chemical alcohol or polysaccharose products. Continuous production is adopted in the manufacturing method, and therefore, the production efficiency is high.

The invention relates to an efficient heat exchange water pipe and a heat pipe radiant heating/refrigerating system. The efficient heat exchange water pipe and a flat heat pipe are arranged in an intersecting mode so as to conduct heat exchange. The efficient heat exchange water pipe is made of metal materials through extrusion or stamping forming, and an array structure composed of two or more small-caliber pipes arranged side by side in the length direction of the water pipe is arranged in the water pipe. The efficient heat exchange water pipe is provided with a flat surface attached to the flat heat pipe. The side walls of the small-caliber pipes are connected with one another. The internal equivalent diameter of each small-caliber pipe ranges from 1 mm to 15 mm. One end of the efficient heat exchange water pipe is provided with a connector which is communicated with an external water source. The small-caliber pipes are communicated with the water source through the connector. The efficient heat exchange water pipe has the advantages of being high in heat exchange efficiency. According to the heat pipe radiant heating/refrigerating system with the efficient heat exchange water pipe, indoor heating and refrigeration are completed through the heat pipe radiation technology and dehumidification can also be achieved; the heat pipe radiant heating/refrigerating system with the efficient heat exchange water pipe has the advantages of being simple in technology, safe in operation and high in efficiency.

The present application relates to a Raman amplifier having an increased dynamic range, and particularly for laser pump sources and a method of pumping Raman fiber amplifiers over a greater dynamic range. In a multi-channel optical system, optical amplifiers must be able to provide gains over a large dynamic range, which is determined by the distribution of node-to-node distances in the network, as well as the number of channels. The present invention has found that the dynamic range of a Raman amplifier can be significantly increased by using pulse width modulation to pulse pump current at or near the minimum current stability threshold, in order to produce lower power output. The duty cycle of the pulsed current is selected to achieve a time-averaged operating condition, thus the time averaged pump power can be reduced in a linear fashion well below the capability of a continuous wave system.