227results about How to "Improve antiknock performance" patented technology

A four-cycle engine is provided with valve timing adjusters for adjusting opening and closing timing an and an exhaust valve. In medium- to high-speed ranges in medium- to high-load regions of the engine, a closing point (ExC) of the exhaust valve defined as a point of transfer from an acceleration portion to a constant speed portion on its valve lift characteristics curve is set to a point a specific period before an intake top dead center, and an opening point (InO) of the intake valve defined as a point of transfer from a constant speed portion to an acceleration portion on its valve lift characteristics curve is set to a point after the intake top dead center. In addition, the period from the closing point (ExC) of the exhaust valve to the opening point (InO) of the intake valve is made longer in the medium-speed range than in the high-speed range in the medium- to high-load regions of the engine.

Barrier units and articles made therefrom, particularly constraining bands of high strength and low weight for containing articles, especially in blast resistant container assemblies, are disclosed. The barrier unit comprises a surface having a regular polygonal perimeter with a plurality of substantially parallel sides, each of which terminates in at least one loop integral with the surface. The surface comprises at least one network of high strength fiber with at least about 50 weight percent of the fiber comprising substantially contianuous lengths of fiber aligned in the hoop direction of the loops. The barrier units have utility as constraining bands for loads of articles like logs, and as doors/closures for access openings to the interior of aircraft blast resistant cargo containers. They are also useful as fences and window protectors.

Disclosed is a system and method to both reduce a degree of explosive shock waves and to absorb a degree of explosive blast energy from the undercarriage of a vehicle which comprises the use of one or more layers of rigid closed-cell spray polyurethane foam, applied to the armored undercarriage of the vehicle. This invention combines two key aspects: 1) blast suppression or mitigation materials that absorb energy and 2) traditional military hardened armor solutions. The effectiveness of spray applied rigid foam has been proven to both dramatically reduce shock waves and absorb energy from explosive blasts (e.g., IEDs).

Disclosed herein is a control apparatus for a spark-ignition engine that is capable of avoiding knocking at the time of high-load operation. With this control apparatus, a residual-gas suction unit or the like is not used, an exhaust gas does not deteriorate due to injection in a compression stroke, and a thermal efficiency also does not decrease.

An engine control apparatus (ECU) 20 is used for the control of a direct-injection type spark-ignition engine. During the high-load operation of the spark-ignition engine, the ECU 20 injects fuel a plurality of times. In addition, the ECU performs first fuel injection toward internal EGR that exists in a combustion chamber of the spark-ignition engine.

The invention belongs to the field of recycling of solid waste, and provides a method for preparing liquid fuel by using biomass. The method is characterized by comprising the following steps that thereaction phase and the extract phase are mixed to form a two-phase system to serve as a reaction medium; an acid catalyst, a hydrodeoxygenation catalyst, a biomass raw material and the reaction medium are added into a reactor at the specific mass ratio; a hydrogen source is introduced to have the continuous reaction under the specific temperature and stirring conditions, and cellulose and hemicellulose in the biomass are conversed to be 2,5-2-methylfuran and 2-methylfuran respectively; the water phase and the organic phase are separated, the organic phase rich in 2,5-2-methylfuran and 2-methylfuran is obtained to serve as the liquid fuel, and the unreacted rest materials in the water phase are recycled. The method provided by the invention does not need to pre-process the biomass, can lower temperature and hydrogen consumption and loss needed by the reaction, reduces the separation and purification process, and can integrate 2,5-2-methylfuran and methylfuran into the fuel product directly.

The invention discloses a novel antiknock fireproof plate and a preparation method thereof. The plate comprises a punching plate and an active powder concrete slab, wherein the active powder concrete slab comprises the following raw materials by weight percentage: 29.62-31.40% of aluminate cement, 32.60-34.55% of quartz sands, 4.11-8.72% of steel fiber, 0.14-0.20% of basalt fiber, 0.15-0.21% of plastic steel fiber, 10.37-11.0% of silica fume, 8.89-9.42% of quartz powders, 0.74-0.79% of high-efficiency water reducing agents and 8.38-8.89% of water. The flexural strength, antiknock performance, fire insulation performance, impact resistance and penetration resistance of the plate are all significantly improved, and the plate is suitable for the antiknock fireproof projects in high resistance.

The invention belongs to the technical field of geotechnical engineering model test equipment. The proposed geotechnical engineering anti-explosion structure model test device is composed of a side-limited box body and an explosion pit at the lower part, and is equipped with a matching wave-eliminating mechanism, a locking mechanism and a sliding Positioning mechanism; wave dissipation mechanism includes aluminum wave dissipation grid (21) and wooden wave dissipation plate (20); sliding positioning mechanism includes two-way jack cylinder (15), guide rail (17) and limit block (19); locking The mechanism is composed of a locking pull rod (3), a side limit connecting block (18) and a nut (2). The invention can simulate different explosion forms in equipment with moderate size; meet the convenient and feasible requirements for excavation of caverns, installation of enclosure structures and measurement equipment; it can be reused, and it is beneficial to observe the damage of structures in the test; The results can provide an important basis for underground explosion-resistant engineering design and scientific research.

The invention discloses a guiding buffering anti-explosion device for a vertical air shaft. The device is mainly composed of an outer frame, an inner frame, a buffer umbrella, a central guiding column and a counter weight mechanism. Two vertical columns (201) of the outer frame are fixed on a shaft head base (1) respectively, a guiding cylinder (5) is arranged between two beams (202) of the outer frame, vertical columns (301) of the inner frame are mounted on the inner sides of the vertical columns of the outer frame in a vertical sliding mode, the bottom ends of the vertical columns of the inner frame are fixed with a door (12), ribs (601) of the buffer umbrella are fixed below the beams of the outer frame, a base plate (602) and a buffering block (603) are fixed below the ribs, and the central guiding column penetrates the guiding cylinder to be fixedly connected with the buffering umbrella and the door. According to the device, rigid guiding constraints and a buffering energy absorption apparatus are added, so that the reliability and the anti-explosion capacity of the anti-explosion door are improved, effects on normal ventilation of the shaft are small, and improvements of air shaft anti-explosion doors of production shafts are facilitated.

The invention belongs to the technical field of additives, and in particular relates to a gasoline additive. The gasoline additive consists of the following components in parts by weight: 30-40 parts of methanol, 5-6 parts of isobutanol, 10-15 parts of ethanol, 15-20 parts of methyl tertiary-butyl ether, 20-25 parts of naphtha, 0.1-0.5 part of dimethyl phosphate, 0.8-1.5 parts of tween 80 and 10-30 parts of a mixture of rosin and a camphor extracting solution, wherein the weight percent of rosin is 45% and the weight percent of the camphor extracting solution is 55%. The gasoline additive not only can greatly improve the octane value, but also is environment-friendly and safe, so that the gasoline quality is effectively improved, and the gasoline saving effect is obvious.

The invention discloses a vertical air shaft double-door type explosion-proof system, which mainly consists of a gable wall body (2), door bodies (3), a buffer framework (4) and a flexible buffer wall (5), wherein the gable wall body and the buffer framework are respectively fixed on a wellhead steel reinforced concrete base (1); small holes are respectively and correspondingly formed in upper and lower cross beams arranged at the left and right sides of the buffer framework at fixed intervals; the flexible buffer wall consists of a plurality of string-shaped buffer units; the string-shaped buffer units are correspondingly fixed in the small holes formed in the upper and lower cross beams arranged at the left and right sides of the buffer framework; the door bodies (3) are respectively arranged on a short upright post of the buffer framework (4) through a door shaft hinge (6); and the two ends of the door bodies (3) are supported on the gable wall body. The vertical air shaft double-door type explosion-proof system has the advantages that the fast explosion release and automatic resetting can be realized; higher explosion-proof performance is realized; and the vertical air shaft double-door type explosion-proof system is applicable to new and old air shaft building.

The invention belongs to explosion removing devices and mainly relates to an anti-fragment wave absorbing explosion removing tank. The wall face of the explosion removing tank (1) sequentially comprises a decorating layer (6), a continuous basalt fiber layer (5), a steel plate (4), foamed aluminum (3) and a lining steel plate (2). The decorating layer (6) is located at the outermost layer, at least one layer of the continuous basalt fiber layer (5) is located on the outer layer of the steel plate (4) and mainly has the anti-fragment function, the foamed aluminum (3) is located between the steel plate (4) and the lining steel plate (2) and mainly has the wave absorbing function, and the feature that explosion shock wave energy can be effectively absorbed is utilized to reduce shock wave peak pressure and convert instant shock wave load into quasi-static load. The foamed aluminum (3) is made of at least one layer of single-specification materials, when the multiple layers of the foamed aluminum (3) are arranged according to anti-explosion requirements, the foamed aluminum layers are sequentially arranged with the density decreasing from outside to inside, and the foamed aluminum structure with certain density gradient is formed.

An additive for improving the power performance of gasoline and decreasing the harmful components from its tail gas is prepared from methanol, ethanol-butanol mixture, acetal dimethanol, methyl acetone, butaneone, methyl acetate, toluene, ethylbenzene, solvent oil No.6 and 200, and N-methyl phenylamine.

The invention discloses a warship board multilayer anti-detonation protection structure. The warship board multilayer anti-detonation protection structure comprises a double-layer shell, a void compartment, a first liquid compartment and a second liquid compartment, wherein the double-layer shell, the void compartment, the first liquid compartment and the second liquid compartment are sequentially ranked from the outer side of a warship body to the inner side of the warship body, the water filling height h of the first liquid compartment and the water filling height h of the second liquid compartment are 70%-80% of a compartment height H, the void compartment is separated from the first liquid compartment through a first compartment separation plate, the first liquid compartment is separated from the second liquid compartment through a second compartment separation plate, the second liquid compartment is separated from an inner compartment of a warship through a third compartment separation plate, and the side, towards a compartment body, of the second liquid compartment is fixedly connected with a plurality of longitudinal box girders which are vertically ranked at intervals. The warship board multilayer anti-detonation protection structure with the structural style has the advantages of being light in weight, good in anti-detonation performance, high in residual intensity and the like, when a warship board is impacted by detonation, most detonation impact energy can be absorbed, the compartments of the warship are prevented from being damaged, and personal losses are avoided.

The invention discloses a closed-loop type mine-used lifesaving cabin body. The closed-loop type mine-used lifesaving cabin body is composed of a plurality of cabin body units in a combined mode end to end, wherein each cabin body unit comprises an inverted-U-shaped cabin body shell and a cabin body bottom shell which is used in cooperation with the cabin body shell, the two ends of each cabin body unit are provided with a cabin body connecting flange I and a cabin body connecting flange II respectively, the cabin body units are fixedly connected through cooperation between the cabin body connecting flanges I and the cabin body connecting flanges II, a plurality of horizontal plane closed-loop type reinforcing ribs are arranged on the two sides and the end faces of the interior of the lifesaving cabin body and are arranged in the cabin body direction, a plurality of vertical plane closed-loop type reinforcing ribs in the cabin body direction and a plurality of annular reinforcing ribs parallel to the cabin body connecting flanges I are arranged on the top surface, the bottom surface and the end faces of the lifesaving cabin body, and the reinforcing ribs in the three directions are staggered to form a closed-loop type reinforcing rib grid structure. According to the closed-loop type mine-used lifesaving cabin body, due to the fact that the reinforcing ribs are of a closed-loop and grid structure, stress is effectively dispersed, and antiknock performance is improved; due to the fact that the structure with the split units is adopted, movement and exchange of the closed-loop type mine-used lifesaving cabin body are convenient, and construction and transport are convenient.

The invention discloses a staggered splicing type steel plate-RPC anti-detonation door and a construction method thereof. According to the anti-detonation door, a cavity formed by a door leaf front side steel plate, a door leaf reverse side steel plate and a plurality of inner ribbed beams is filled with an RPC inner core. The construction method of the anti-detonation door comprises the steps that firstly, the door leaf front side steel plate, the door leaf reverse side steel plate and the inner ribbed beams are manufactured according to the size; secondly, the number of needed steel bars is calculated; thirdly, steel bar holes are formed in the inner ribbed beams in the length direction; fourthly, the door leaf front side steel plate is welded to the odd-number inner ribbed beams, and the door leaf reverse side steel plate is welded to the even-number inner ribbed beams; fifthly, the door leaf front side steel plate and the door leaf reverse side steel plate are spliced in a staggered manner, and the steel bars penetrate the steel bar holes; sixthly, reactive powder concrete is poured in the cavity formed by the door leaf front side steel plate, the door leaf reverse side steel plate and the multiple inner ribbed beams and is standing for 48 h; seventhly, the anti-detonation door is conveyed into a steam curing room at the temperature of 90 DEG C to be cured for 72 h; and eighthly, after 28 days, the RPC and the steel plates are effectively bonded to form the steel plate-RPC anti-detonation door. The staggered splicing type steel plate-RPC anti-detonation door and the construction method thereof are applied to anti-detonation protection projects.