382results about How to "Reduce the compression ratio" patented technology

In one embodiment web page response time is improved by requesting multiple resources in a batch request, receiving said resources in a batch response, and disjoining the resources and corresponding HTTP headers before caching on the client. The resources are retrieved by web browser from the cache separately without loss of cache granularity. Client parses base page to determine the embedded resources and includes in the batch requests only web addresses those resources that are uncached or may be expired. To reduce required bandwidth, server validates caching information of every resource before sending the batch response. In another embodiment web application performance for mobile users is improved by combining individually requested resources into the batch response on a network node positioned on a link between cellular network and the Internet.

A compound cycle engine (10) comprises a compressor and a turbine section (14, 18), and at least one cycle topping device (16) providing an energy input to the turbine section (18). The compressor section (14) compresses the air according to a pressure ratio PR_gt. The cycle topping device (16) further compresses the air according to a volumetric compression ratio R_vc, and wherein PR_gt×R_vc are selected, according to one aspect of the invention, to provide a cycle which permit a more compact and lighter compound cycle engine to be provided.

A subsection compression-subsection heat supply-subsection gas expanding compression type machine set belongs to the technical field of heat pumps/refrigeration, and consists of a compressor, an expander, a heat exchanger, a second heat exchanger and a low-temperature heat exchanger. Gas working substances absorbing heat from the low-temperature heat exchanger and raising temperature enter the compressor; after the gas working substances are compressed in a low pressure compression section, a part of the gas working substances are provided for the heat exchanger to complete the heating of a heated medium at an initial stage; the part of the gas working substances enter the expander and is expanded at a low pressure expansion section; the other part of the gas working substances are provided for the second heat exchanger to complete the heating of a second stage of the heated medium after continuously passing through the whole compression process and raising temperature, and enter the expander from an inlet of the high pressure expansion section of the expander for expanding; the gas working substances completing the expanding work flow through the low-temperature heat exchanger to absorb the heat and raise the temperature and enter the compressor; and a heat regenerator is added to form a regenerative machine set. The gas expanding compression type machine set reduces temperature difference of heat transmission and improves the performance index; when taken as a heat pump, the gas expanding compression type machine set is particularly suitable for occasions with high heating temperature and wide range; and when used for refrigeration, the gas expanding compression type machine set can reduce power consumption.

The invention discloses a superhigh-strength high-toughness steel plate for ocean engineering and a manufacturing method thereof. The superhigh-strength high-toughness steel plate comprises the following chemical components in percentage by weight: 0.06-0.10% of C, 0.20-0.40% of Si, 1.10-1.65% of Mn, at most 0.010% of P, at most 0.0020% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.60-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.60% of Cu, 0.40-0.60% of Mo, 0.020-0.040% of Alt, and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting in a converter, rolling on a Steckel reversing mill, and finally carrying out hardening and tempering heat treatment by a TMCP (thermomechanical rolling process) technique. The steel plate has favorable properties: the tensile strength is 770-840 MPa, the yield strength is 710-800 MPa, the elongation percentage is 16-19%, the -40 DEG C low-temperature lateral impact and low-temperature ageing impact properties are greater than or equal to 90J, and the cold bending resistance is qualified; and thus, the steel plate has the advantages of ultrahigh strength, excellent low-temperature impact and low-temperature ageing impact properties, and stable production technique.

A serial, dual piston high pressure fluid pumping system that overcomes the difficulties of gas in the fluid stream without the need for added mechanical valves or fluid paths. A bubble detection and recovery mechanism monitors compression and decompression volumes of the serially configured dual pump head pump, and the overall system delivery pressure. Bubble detection is effected by sensing a ratio of compression to decompression volume and determining if the ratio exceeds an empirical threshold that suggests the ratio of gas-to-liquid content of eluent or fluid in the system is beyond the pump's ability to accurately meter a solvent mixture. The magnitude of the ratio of compression to decompression volume indicates that either the intake stroke has a bubble or that the eluent has a higher-than-normal gas content. Once a bubble has been detected, recovery is effected by forcing the pump into a very high stroke volume with the compression and decompression stroke limits constrained to obtain the largest delivery stroke compression ratio that will expel a bubble or solvent that has detrimental quantities of gas.

The invention is directed to a variable compression ratio internal combustion engine in which the compression ratio of the engine can be varied and multiple types of fuels having different combustion velocities are used. The invention provides a technology for achieving excellent engine performance for respective types of fuels. In the variable compression ratio internal combustion engine in which the compression ratio can be varied and multiple types of fuels having different combustion velocities are injected through multiple fuel injection valves, maps from which a target compression ratio of the internal combustion engine is read out are switched in accordance with the fuel used, thereby suppressing knocking or other disadvantages.

The present invention relates to an “alcohol based fuel and/or biofuel composition” having as a main feature the capacity of totally or partially substituting traditional fuels, such as gasoline and diesel, in conventional internal combustion engines. In addition, the “alcohol based fuel and/or biofuel composition” can be used for the total or partial substitution of burning oils.

The invention discloses an auto-cascade jet type refrigerator, which comprises a first throttling element, an evaporator, a first jet, a first condenser, a first circulating pump, a first generator, a first gas-liquid separator, a second throttling element and an evaporator condenser; the first jet is sequentially connected in series with the first condenser, the first gas-liquid separator, the first circulating pump and the first generator to form a loop; the evaporator condenser, the first throttling element and the evaporator are sequentially connected in series between the gas phase outlet of the first gas-liquid separator and the first jet; and the second throttling element and the evaporator condenser are sequentially connected in series between the liquid phase outlet of the first gas-liquid separator and the first jet. The invention breaks through the constraint of the traditional idea, and adopts the method of auto-cascade to decrease the compression ratio to be reached by a refrigeration system in order to solve the problem that the jet coefficient is abruptly decreased after the difference between the backpressure and jet pressure of the jet exceeds a certain value, and the auto-cascade jet type refrigerator can utilize the jet type refrigeration technology to achieve low refrigeration temperature.

The invention discloses a manufacture method of an extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age, which performs reasonable setting and optimization to controlled rolling and controlled cooling technology through converter smelting, LF and RH refining, so as to perform quenched-tempered heat treatment. The steel plate has good performance, the tensile strength is 780 to 850 MPa, the yield strength is 720 to 800 MPa, the percentage of elongation is 18 to 21 percent, the low-temperature transverse impact at minus 40 DEG C is larger than or equal to 120J, the low-temperature aging impact property at minus 40 DEG C is larger than or equal to 100J, the steel plate has ultrahigh strength, high tenacity and excellent low temperature aging tenacity, and the production technology is stable.

The invention discloses a method for producing an ocean engineering steel plate with a low compression ratio, thick specification and ultrahigh strength, which has a uniform performance in a thickness direction. The method comprises the following steps: carrying out smelting and continuous casting production through a converter, carrying out rolling on a medium-thickness plate coil by using a controlled rolling and controlled cooling process, carrying out laminar cooling at the finish cooling temperature of 650-700 DEG C and the cooling rate of 5-10 DEG C/s after rolling, and finally carrying out normalizing, quenching and tempering thermal treatment. The ocean engineering steel plate with a low compression ratio, thick specification and ultrahigh strength, which has the uniform performance in the thickness direction and is obtained according to the invention is good in performance, and on the basis of meeting the certification requirements of classification societies, such as DNV (Det Norske Veritas), CCS (China Classification Society) and ABS (American Bureau of Shipping), for steel E690, the thickness-specification steel plate is smaller than 15MPa in the thickness direction in terms of thickness difference, is smaller than 20J in terms of the difference of lateral impact average values at the low temperature of minus 40 DEG C, is smaller than 1% in terms of elongation difference, and in addition, has the characteristics of batch production condition, stable production process, strong operability and the like.

The invention relates to an engine belonging to the technical field of power machinery. The engine is also provided with an air cylinder, a high pressure air storage tank, a high pressure exhaust valve and a high pressure inlet valve except for a power cylinder of a common internal combustion engine. A composite circulating mode of low compression ratio, high compression-rising ratio and high expansion ratio is adopted in the engine. The premixing combustion of a full working condition range of the internal combustion engine is realized by spraying a homogeneous mixture gas in a high pressureair compression ignition cylinder; and the engine adopts an exhaust gas recirculation technology and an air valve starting phase changeable technology. According to the engine load size and the pressure of the high pressure air storage tank, the air cylinder can be switched into an air power cylinder or a combustion power cylinder, the fuel spraying of the power cylinder is stopped, the power cylinder can be driven by using high pressure air and can also be used as the air cylinder to provide air with proper pressure for a turbosuperchager to drive in a mode of hybrid power. Air of the high pressure air storage tank is supplied by the air cylinder or directly charged by a filling station. The engine has higher economic, discharging and dynamic properties than the common internal combustion engine.

A four stroke diesel engine combined with a supercharger is operable to supply varying amounts of air to the engine responsive to the load on the engine. The supercharger has a pair of rotors driven by the engine operable to move air to the engine. Gates associated with the rotors control the amount of air and pressure of the air moved by the rotors to the diesel engine.

The invention discloses a low-grade heat energy auxiliary-drive composite low-temperature refrigerating system. The system comprises a generator, an ejector, a working medium pump, a condenser, a gas-liquid separator, a compressor, a first throttling component, a condensation evaporator, a second throttling component, an evaporator and a heater. A high-boiling-point component is condensed into liquid to serve as a low-boiling-point component cooling medium through the ejector driven by the low-grade heat energy; and the ejector has another function of increasing suction pressure of the low-boiling-point component at a suction port of the compressor to reduce the compression ratio of the compressor so as to realize lower refrigerating temperature. Because the compression process of the high-boiling-point component during circulation is finished by the ejector, the power consumption of the compressor is reduced; and the ejector also improves the suction pressure of the low-boiling-point component at the suction port of the compressor and is also favorable for further reducing the power consumption of the compressor. The system has the advantages of realizing high-efficiency utilization of a low-grade energy source, along with stable running, obvious energy saving effect and broad application prospect.

The invention discloses a low-compression ratio super-strength steel plate for ocean engineering and a manufacturing method thereof. The super-strength steel plate for ocean engineering comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.60-1.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0080% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.90-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.40% of Cu, 0.40-0.60% of Mo, and the balance of Fe and inevitable impurities. The laboratory smelting, trial rolling on a rolling mill, TMCP (thermal mechanical control processing) technology and thermal refining are sequentially performed, thus the super strength, high toughness, weldability and manufacturability of the super-strength steel plate for ocean engineering are realized.

The invention provides a limiting feedback method and device for a large-scale antenna system. The method comprises the steps that a receiving terminal feeds back low-dimensional channel status information obtained through a principal component analytical method to a transmitting terminal in each short cycle; the receiving terminal continues channel estimation, obtains a dimensionality reduction matrix through the principal component analytical method and feeds back the dimensionality reduction matrix to the transmitting terminal in each long cycle; the transmitting terminal receives the dimensionality reduction matrix fed back by the receiving terminal at the beginning of each long cycle, multiplies a transpose of the dimensionality reduction matrix and the low-dimensional channel information and restores high-dimensional status information; the transmitting terminal receives the low-dimensional channel status information fed back by the receiving terminal in each short cycle. By means of the method, the principal component analytical method is adopted to conduct dimensionality reduction treatment on the high-dimensional channel status information with spatial relativity so as to lower the compression ratio; the receiving terminal only needs to feed back corresponding codon serial numbers, so that the burden of the receiving terminal is mitigated; the transmitting terminal only needs to restore the high-dimensional channel status information, so that the processing complexity of the transmitting terminal is lowered.

A data encoding apparatus operable to encode a plurality of data blocks produces encoded data in accordance with at least one of a selectable target data quantity or a selectable target data quality. The apparatus comprises a plurality of encoding processors at least one of the encoding processors having a parameter controller operable to determine, for each of the data blocks, a value for an encoding parameter to be used in an encoding process, which encoding parameter has an effect of influencing the quantity of encoded data produced by the encoding process and the quality of a decoded version of each data block encoded using the encoding process, the value of the parameter being determined to satisfy at least one of the target data quantity and the target data quality for each encoded data block, and an encoder operable to encode each of the data blocks in accordance with the encoding process to form encoded data blocks using the value of the encoding parameter determined for each block, and a selection processor operable, for each data block, to select one of the encoded blocks produced by each of the plurality of encoding processors in dependence upon which of the data blocks has at least one of the highest quality and the lowest data quantity. The encoding process is selected to provide either the highest decoded image quality or the lowest encoded data quantity depending on whether the compression ratio for each data block is fixed or the decoded data quality is fixed and the quantity of encoded data arranged to vary. Embodiments of the present invention find particular application for encoding video data, and for use in the Motion Picture Experts Group-IV (MPEG-IV) coding scheme.