63 results about "Cyclic compression" patented technology

The invention relates to a testing device for vertical cyclic compression-lateral swing shearing dynamic loading. The testing device comprises a peripheral frame, a model case arranged in the peripheral frame, a loading unit for loading the model case and a data acquisition unit for acquiring testing data of a soil test sample in the model case, wherein the soil test sample fills the model case; the loading unit comprises a vertical dynamic load actuator which applies a vertical dynamic load, a lateral swing dynamic load actuator which applies a lateral swing horizontal shearing dynamic load and a lateral pressure loading unit which controls a confining stationary load of the model case. Compared with the prior art, the device provided by the invention can independently apply a horizontal rotating cyclic dynamic load to realize cyclic shearing dynamic load, and can be independently loaded or coupled with the vertical cyclic dynamic load. Moreover, the device is simple in structure, easy to assemble and detach and simple and convenient to operate in the experimental process.

The invention relates to carbon nanotube/polypyrrole composite sponge and a preparation method thereof, belonging to the field of the synthesis and application of carbon nanocomposites. The carbon nanotube/polypyrrole composite sponge is formed through stacking and winding composite tubes with microcosmic core-shell structures and has a porous structure, wherein each composite tube consists of a carbon nanotube and a uniform-thickness polypyrrole layer coated outside the carbon nanotube. The mass content of polypyrrole in the composite sponge is controllable; the composite sponge has good elasticity, good cyclic compression stability and excellent electrochemical properties; the carbon nanotube/polypyrrole composite sponge is prepared by the method which combines a chemical vapor deposition method, an adsorption composite method and an electrochemical polymerization method; the preparation method has ingenious conception and is simple and easy in operation.

The invention discloses a lead powder and nitrogen gas closed-cycle static-pressure dense-phase sectional boosting pneumatic conveying system. The system comprises a lead powder storage bin (1), a lead powder discharging device (3), a pneumatic feed valve (4), a transmitting bin pump (6), a lead powder conveying main gas source valve group (7), a discharge fluidization device (8), a bin pump discharge port boosting device (9), a pneumatic discharge valve (10), a dust conveying pipeline internal pressure sensor (11), a sectional external booster (12) with a pressure sensor, a dust conveying pipeline (13), a gas-solid separation device (14), an ultrafiltration device (15), a lead powder bin (16), a nitrogen gas return pipeline (17), a nitrogen gas storage tank II (19), a nitrogen gas recycling compression system device (21), a high-pressure nitrogen gas pipeline (23), a nitrogen gas storage tank I (24) and a system control device (25) which are sequentially connected. According to the system, the equipment quantity and the equipment maintenance load can be reduced, and the occupational risks of lead powder conveying in a lead-acid storage battery production process can be effectively eliminated or reduced.

A thin-walled fuser roll core cylinder assembly permitting fast warm-up times and improved energy efficiency wherein cracking of the thin walls due to cyclic compression is prevented by strengthening the thin walls proximate to the end region where the core cylinder is engaged by the drive gear. Use of such a thin-walled fuser roll in an imaging system and a process of fusing toner onto a copy substrate using the thin-walled fuser core.

The invention relates to a characterization method for the compression stress softening and transient-persistent deformation of an elastic body and provides an effective method for evaluating the stress softening and transient-persistent deformation of the elastic body under circular compression. A quantitative characterization method comprises the following steps: (a) carrying out single-shaft circular compression test on a columnar sample on a universal tensile test machine, and repeatedly and continuously compressing and releasing the sample at the same speed, so as to acquire a circular compression stress-strain curve; (b) reading the compression stress when the sample is compressed to a specific compression strain each time from the circular compression stress-strain curve, thus acquiring quantitative stress softening data under a circular compression mode; (c) calculating an instant height H1 of the sample according to the residual strain when the stress is reduced to 0 in each compression period on the circular compression stress-strain curve and recording transient compression deformation as K, wherein the initial height of the columnar sample is h0, the height of the columnar sample is hs when the sample is compressed to reach a stipulated compression strain, and a calculation formula is shown in the specification.

The invention provides a wavelength-tunable narrow linewidth laser based on a graphene Bragg grating. The wavelength-tunable narrow linewidth laser comprises the graphene Bragg grating, wherein the graphene Bragg grating comprises a fiber core, cladding and a graphene layer which covers the cladding in sequence from inside to outside. The thickness of the cladding is regulated to cover the cladding with the graphene layer, the light intensity of pump light transmitted to the fiber core is regulated to regulate the modulation refractive index of the graphene Bragg grating, the regulation of the central wavelength of the graphene Bragg grating is realized, so that the weave length of a laser signal returned and output by the graphene Bragg grating can be regulated, and the laser signal subjected to wavelength regulation can be subjected to further linewidth cyclic compression on the basis of a Rayleigh optical fiber. Through the laser, the central wavelength of the graphene Bragg grating can be regulated, the accuracy and the response time of the regulation of the central wavelength of the graphene Bragg grating are improved, and in addition, a laser signal with ultra-narrow linewidth can be obtained on the basis of the Rayleigh optical fiber.

The invention provides a preparing method of a fine-grain large-size magnesium alloy profile. The method sequentially includes the steps of performing homogenization heat treatment on a magnesium alloy ingot blank, performing upsetting, three times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into a furnace for heat preserving, performing upsetting, four times ofcyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace for heat preserving, performing upsetting, five times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace for heat preserving, performing upsetting, six times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace forheat preserving, performing extruding by means of residual heat, and performing quenching at an extrusion outlet through an annular nozzle to obtain the magnesium alloy profile. By means of the method, the blank can be effectively prevented from cracking in the preparing process, the edge temperature and deformability of the blank can be improved, complete static recrystallization can happen to magnesium alloy, more importantly, grains of the magnesium alloy profile can be refined, and the preparing method is particularly suitable for preparing the large-size magnesium alloy profile.

A device for assisting and/or taking over the pumping function of the heart, with a multilayer sheathing part configured for compressing the heart at least in certain sections, wherein the sheathing part has at least one stabilization layer for shaping the sheathing part and at least one inner extensible augmentation layer, and wherein at least one cavity is formed between the stabilization layer and the augmentation layer, the cavity being inflatable and deflatable by a fluid, for cyclic compression of the heart. Provision is made for the stabilization layer to be inflatable with a fluid, at least in certain sections, in order to convert the sheathing part from a coiled and/or collapsed insertion state of the device in the body into an arched functional state, wherein the heart, in the functional state of the sheathing part, is at least partially sheathed and/or encompassed.

The invention discloses a device for recycling cold energy of low-temperature nitrogen and a using method of the device. The device comprises a compression system, an expansion refrigeration system and a heat exchange system which communicate through pipelines and valves, the compression system is composed of a raw material compressor suitable for low-temperature gas and a circulating compressor suitable for low-temperature gas. The compressor is used for compressing low-temperature nitrogen. The expansion refrigeration system is composed of one or more turbo expanders and provides a cold source for the device. The heat exchange system is composed of one or more sets of heat exchangers and used for heat exchange of nitrogen liquefaction. The three systems are highly coupled, can adapt to the raw material low-temperature nitrogen under different temperature conditions, are wide in application range, and can greatly improve the cold energy recovery efficiency of the low-temperature nitrogen and reduce the energy consumption of liquid nitrogen products.

The invention discloses a method for dilute acid pretreatment of plant straws by microwave-cyclic compression percolation. The method comprises: first conducting standing infiltration on straw particles with a dilute acid solution, then loading the straw particles into a cylindrical reactor, performing fed-batch of the dilute acid solution to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; after solid-liquid separation, re-injecting the acid solution and dispersing the straw particles uniformly; carrying out fed-batch of the filtrate obtained from the separation to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; and repeating the operations till the end of the reaction. By infiltrating the straw particles in the acid solution in advance and adopting a filtrate cyclic compression mode, the method provided in the invention reduces the concentration and dosage of the acid solution, increases the reaction product concentration, and enhances the reaction speed simultaneously.

The invention discloses a zigzag conductive silicone rubber nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, constructing a three-dimensional continuous conductive aerogel network in a zigzag mold by using a high-conductivity carbon nanomaterial; and filling the gel network with a silicone rubber prepolymer, and curing/demolding to form the flexible zigzag conductive silicone rubber material with a specific included angle. The composite material can show excellent conductivity under the condition of extremely low filler content (less than or equal to 5.0 wt%). Besides, under the condition that the content of the conductive filler is kept fixed, the electromagnetic shielding effectiveness value of the material can be effectively adjusted by simply adjusting and controlling the included angle (15-120 degrees) of the zigzag material, for example, the electromagnetic shielding effectiveness under the X wave band (8.2-12.4 GHz) can be controllably adjusted within the range of 31.0-48.3 dB. Meanwhile, the macroscopic zigzag structure also has excellent angle stability, and the angle of the zigzag structure is not obviously changed after 1000 times of cyclic compression-tensile tests.

The invention discloses a hierarchical abstraction and compression method for a distribution network model. The distribution network model is abstractly divided into four layers: a plant station layer, a switch layer, a connectivity layer and a user layer, wherein the connectivity layer, the switch layer and the user layer are obtained according to a compression algorithm, the compression rule of which is as follows: the connectivity layer: a feeder line is a whole object which is compressed to a segment and connectivity switches among different feeder lines are retained; the switch layer: a transitional branch without a switch object is compressed and the tail end of a radiation pattern branch of a non-important user is compressed, and no pole and tower information is retained, and cyclic compression is carried out; and the user layer: a transitional branch without a switch object is compressed, important pole and tower information and user nodes are retained, and cyclic compression is carried out. According to the method disclosed by the invention, the topological attributes of a multi-sided hierarchical model and a GIS detailed model of the distribution network are fully consistent, thereby better blending the requirement of macro and micro decision-making views required by a power distribution operation decision on corresponding abstraction model of the distribution network.

The invention provides a pilot test device for evaluating the performance of a low-carbon hydrocarbon oxidation catalyst. The device comprises a raw material preparation system, a reaction system, anabsorption system, a lean recycle gas component regulation and control system, a cyclic compression system and an online analysis system, wherein the raw material preparation system, the reaction system, the absorption system, the lean recycle gas component regulation and control system and the cyclic compression system are connected in sequence and are combined into a closed loop. By adopting thetest device, the problem that an existing pilot test device for the performance of the low-carbon hydrocarbon oxidation catalyst in the gas circulation type process cannot effectively adjust accumulated COx carbon oxides in recycle gas while ensuring the process conditions such as device pressure flow and the like are stable is well solved, the accurate and stable evaluation of the catalyst is achieved, and an important guarantee is provided for the catalyst sample from a small test to industrialization.

Refrigerant compressor includes an electrical drive unit, a piston/cylinder unit which can be driven by the drive unit for the cyclical compression of refrigerant, and at least one sound-damping unit made of a thermoplastic, through which sound-damping unit refrigerant can flow and which sound-damping unit includes at least one damping chamber. The at least one sound-damping unit is connected to the piston/cylinder unit in order to enable an exchange of refrigerant between the sound-damping unit and piston/cylinder unit. The at least one sound-damping unit includes at least in sections a functional surface. The functional surface is embodied such that an emissivity of a section of the sound-damping unit includes the functional surface is less than 0.7. The at least one sound-damping unit or at least one of the sound-damping units is embodied as a discharge muffler arranged downstream of the piston/cylinder unit in the direction of flow.