97results about How to "Reduce coverage" patented technology

The invention provides a fiber dressing for promoting wound healing and a preparation method and application thereof, and belongs to the technical field of biological materials. The shell of the fiber dressing contains the first medicine for promoting polarization of macrophages, and the first medicine can promote polarization of macrophages at normal and diabetic wound surfaces from M1 type to M2 type; a shell substrate is a mixture of hydrophilic and hydrophobic polymers, so that painless adhesion and stripping of a wound surface can be realized by absorbing seepage and spraying non-irritant normal saline on the wound surface, and secondary injury of the wound surface is reduced; an inner core contains a second medicine and a third medicine which are used for inducing death of M1 type macrophages, so that wound inflammatory response can be reduced, wound bacteria can be killed, wound infection degree can be reduced, and wound healing can be accelerated; the core matrix is a mixture of hydrophilic and hydrophobic polymers with good biocompatibility, can provide mechanical support for the fiber dressing, and provides a slow release effect for the two substances in the core. By controlling the composition of the inner core and the shell, the healing of normal wounds and diabetic wounds can be effectively promoted.

According to the thin-layer sound absorption superstructure composite acoustic enclosure and the using method, the acoustic enclosure is composed of the cover plate, the conformal frame, the thin-layer sound absorption superstructures and the porous sound absorption materials, the variety of the thin-layer sound absorption superstructures is not limited to one, and the broadband noise reduction effect can be achieved through the parallel superposition design of the thin-layer sound absorption superstructures and the porous sound absorption materials. Wherein the thin-layer sound absorption superstructure can absorb noise in different frequency ranges of medium and low frequency bands, the porous sound absorption material can absorb noise in medium and high frequency bands, and the working bandwidth of the composite acoustic shield after parallel connection and superposition can cover the low, medium and high wide frequency bands. The thin-layer sound absorption superstructure composite acoustic shield further has the advantages of being high in space utilization rate, high in space adaptability, small in thickness, low in surface density and high in material replaceability. Compared with an existing sound insulation cover, on the premise that the thickness is small and the surface density is low, the working frequency band is wider, the sound insulation effect is better, and the sound insulation cover has wide application prospects in noise control of various mechanical and electrical products.

The invention discloses polyrotaxane with controllable cyclodextrin coverage rate as well as a preparation method and application of the polyrotaxane, and belongs to the technical field of polyrotaxane materials. The preparation method comprises the following steps: dissolving alpha-cyclodextrin, 3-hydroxyadamantane-1-carboxylic acid and polyethylene glycol diamine in deionized water, refrigerating and assembling to form quasi-polyrotaxane, and blocking to obtain polyrotaxane; wherein the polyethylene glycol diamine is prepared from polyethylene glycol and N, N '-carbonyldiimidazole, and the cyclodextrin coverage rate of the polyrotaxane is directionally regulated and controlled by regulating and controlling the mass ratio of the alpha-cyclodextrin to the 3-hydroxyadamantane-1-carboxylic acid, the adding sequence of the 3-hydroxyadamantane-1-carboxylic acid and the refrigerating and assembling time. Based on the mechanism that 3-hydroxyadamantane-1-carboxylic acid and polyethylene glycol compete in a cyclodextrin cavity, polyrotaxane with a cyclodextrin coverage rate of 0.5-2.5% is synthesized, and a polymer based on the polyrotaxane has better ductility and mechanical properties.

The invention provides a ventilation system of a brake cylinder. The ventilation system comprises a ventilation plug and a safety valve, and the non-sealing cavity is communicated with the safety valve and the ventilation plug so that ventilation of the non-sealing cavity can be achieved. The ventilation plug is a one-way sealing ventilation plug, an air inlet function is removed, air can be exhausted from a non-sealing cavity in a one-way mode, the probability that the ventilation plug sucks water vapor from the outside is reduced, and the reliability of the waterproof function of the ventilation plug is guaranteed. And the safety valve has dustproof and waterproof air inlet functions. The ventilation system adopting the one-way sealing ventilation plug and the safety valve with the dustproof and waterproof air inlet functions comprises a first ventilation working condition and a second ventilation working condition, under the first ventilation working condition, the ventilation system is in a low-pressure exhaust mode, air enters a non-sealing cavity through a waterproof breathable film of the safety valve, and air is exhausted through the ventilation plug and the waterproof breathable film; and under the second ventilation working condition, the ventilation system is in a high-pressure exhaust mode, air is fed through the safety valve, and the safety valve can assist in exhausting on the basis of exhausting air through the ventilation plug and the waterproof breathable film of the safety valve.

The invention discloses a high-speed rail vehicle body plane spraying full-coverage path planning method which comprises the following steps: selecting a high-speed rail plane vehicle body to be planned, and determining a spraying area; building a grid map for path planning; different gray values represent the states, the repetition degrees and the real-time positions of the Agents of different grid units, and a gray state matrix is formed; defining the action direction of the Agent; constructing a multi-level feature aggregation network model as an Agent structure; gray values of movable grid units around the current position of the Agent are converted into a direction probability matrix through calculation, and the direction probability matrix acts on network output of the Agent; formulating a reward function and a path quality evaluation index; and training a multi-level feature aggregation network model in the constructed spraying environment, and selecting an optimal path according to a path quality evaluation index. The spraying device can act on any planar vehicle body with different sizes and different door and window configurations, so that the spraying coverage rate reaches 100%, and meanwhile, the extremely low repetition rate is guaranteed.

The embodiment of the utility model provides an image source, a head-up display and a vehicle, the image source comprises a backlight assembly and an image generation assembly, the backlight assembly comprises a light emitting part and a light control part, the light control part is arranged on the light emitting side of the light emitting part, the image generation assembly is arranged on the light emitting side of the light control part, and the light control part comprises a Fresnel direction control structure, the main optical axis direction of the light is adjusted in two directions; the lens diffusion structure is used for adjusting the divergence angle of light in two directions. According to the image source, the brightness of the image source is ensured, the imaging light can be stably focused to the center of the eye box, and the display effect is improved.

The invention provides an ignition control method and device of an engine, an automobile, equipment and a medium, relates to the technical field of hybrid electric vehicles, and provides an ignition angle determining method for improving the acceleration sound quality by reducing the ignition angle for the hybrid electric vehicles. Due to the fact that the expressive force of the in-vehicle acceleration sound quality in the whole vehicle NVH performance is different in the different driving modes, the theoretical ignition angles needing to be adjusted in the different driving modes are different. According to the method, the back angle values of different theoretical ignition angles are preset for different driving modes, and the back angle values are used for guaranteeing that the actual ignition angle cannot affect the acceleration sound quality of the vehicle. According to the method, the acceleration sound quality is taken as a reference, and the theoretical ignition angle which easily affects the acceleration sound quality in different driving modes is specifically adjusted, so that the coverage of the theoretical ignition angle which needs to be adjusted is reduced to the greatest extent, and the influence of the annealing and ignition angle on the economical efficiency and the dynamic property of the vehicle is reduced to a certain extent.

The invention relates to the technical field of Escherichia fagenii detection, in particular to a target gene, a primer and a method for detecting Escherichia fagenii. The invention provides a target gene for detecting Escherichia fagenii. The sequence of the target gene for identifying the Escherichia fagenii is as shown in SEQ ID NO: 1. According to the present invention, through the comparison of the whole genome of 622 Escherichia bacteria, the conserved gene cheV exists in the Escherichia fagenii, and the gene does not exist in other Escherichia bacteria corresponding to the cheV in the whole genome of the known Escherichia fagenii ATCC 35469, such that the nucleotide sequence such as the SEQ ID NO. 1 is adopted as the target gene for detecting the Escherichia fagenii;

The utility model relates to an electro-catalytic oxidation sewage treatment device, and relates to the technical field of sewage treatment, in order to solve the problem that floating objects affect electro-catalytic reaction, the electro-catalytic oxidation sewage treatment device comprises a flocculation basin, a sedimentation and filtration basin and an electro-catalytic box, the flocculation basin, the sedimentation and filtration basin and the electro-catalytic box are sequentially communicated, one side of the flocculation basin is communicated with a flocculation agent box, and the other side of the flocculation basin is communicated with a water tank. A stirring mechanism is arranged in the flocculation basin and comprises a stirring motor, a stirring rod and stirring blades, the stirring motor is arranged at the top of the flocculation basin, the stirring rod is vertically arranged in the flocculation basin, the output end of the stirring motor is connected to the stirring rod, and the stirring blades are sequentially arranged in the length direction of the stirring rod. A grating mechanism is arranged in the sedimentation and filtration tank, the grating mechanism comprises a grating frame body and a plurality of grating filter screens, the grating frame body is arranged in the sedimentation and filtration tank, and the plurality of grating filter screens are sequentially arranged in the grating frame body at intervals. The method has the effect of improving the electro-catalytic reaction efficiency.

The invention relates to a method (100) for partially automated creation of content of a digital map, the method comprising: - reading (110) the digital map; - receiving (120) environmental data values representing an environment of at least one vehicle; - automatically generating (130) first map content from the received environmental data values; - reviewing (140) the first map content; - confirming (150) or adjusting (151) the first map content; - automatically calculating (160) a secured second map content by a secured algorithm with the reviewed and confirmed or adjusted first map content; - inserting (170) the secured second map content into the digital map; and providing (180) the digital map. Furthermore, the invention also relates to a device, a computer program and a machine-readable storage medium.

The application provides a middle shaft bowl set surface grinding device capable of reducing noise, relates to the technical field of middle shaft bowl set grinding, and comprises a fixed base, one side of the fixed base is provided with a fixed support plate, the top of a sealing cover is provided with an air pump, an output end of the air pump is provided with a main flow pipe, the sealing cover is located on the outer side of a positioning cover, the side of the main flow pipe is connected with a branch flow pipe, the branch flow pipe penetrates through the side of the sealing cover and is provided with a cleaning pipe, the cleaning pipe is installed on the inner side of the sealing cover, a groove is formed in the cleaning pipe, and the cleaning pipe is located at the bottom of a sound-absorbing plate. High-pressure airflow is guided to the cleaning pipe through the main flow pipe and the branch flow pipe, the high-pressure airflow sprayed from the groove of the cleaning pipe is used for cleaning the metal dust attached to the sound-absorbing plate, the problem that the metal dust is accumulated on the sound-absorbing plate is effectively avoided, and the problem that the metal dust generated in the grinding process is diffused along with airflow and attached to the surface of the sound-absorbing material, thereby seriously weakening the noise reduction effect is solved.

The utility model relates to the technical field, and provides a hospital medical staff management on-duty information announcement device, which comprises a support mechanism, a display mechanism and a display mechanism, the telescopic mechanism comprises a first telescopic rod; the jacking mechanism comprises an announcement frame, connecting plates are symmetrically welded to the upper end and the lower end of the announcement frame, first sliding grooves are formed in the connecting plates, inner cavities of the first sliding grooves are movably connected with first positive and negative tooth lead screws, and the circumferential outer walls of the left end and the right end of each first positive and negative tooth lead screw are symmetrically sleeved with jacking balls; the clamping mechanism comprises a second sliding groove formed in the publication frame, so that the problems that when an existing hospital medical staff management on-duty information publication device is used, updated on-duty information needs to be pasted on a formula device through a plastic bag, but paper is inconvenient to install or detach in the pasting mode, and the pasting mode is not convenient are solved. And when the outdated information paper is taken down, the paper is easy to remain on the publicity frame.

The invention discloses an environment monitoring device based on artificial intelligence, and relates to the technical field of environment monitoring. The device comprises a device body, the top of the device body is provided with a driving assembly, the center of the top of the device body is provided with a Bluetooth assembly, the Bluetooth assembly is interconnected with a mobile phone through an intelligent APP, the device further comprises an anti-jamming device, the anti-jamming device is arranged above the device body, and the anti-jamming device comprises an electric telescopic column, a monitoring assembly and a sensing assembly. The bottom of the electric telescopic column is fixedly installed on the top edge of the device body, the bottom of the monitoring assembly is fixedly installed on the top of the telescopic end of the electric telescopic column, the monitoring assembly communicates with the Bluetooth assembly, and the back of the sensing assembly is fixedly installed on the front of the monitoring assembly. According to the invention, the monitoring assembly realizes monitoring height adjustment, which is different from inconvenience caused by manual adjustment of a transmission thread monitoring device by a worker, so that real-time monitoring is realized through automatic adjustment, and hands of the worker are prevented from being worn and injured.

The application provides a wax removal powder, a wax removal method, a ceramic atomizing core and a preparation method thereof, and an atomizer. A water-soluble substance is used to replace traditional alumina as the wax removal powder. After wax removal and sintering, the wax removal powder covering the surface of the ceramic body can be effectively removed by using clean water to wash, the coverage of the wax removal powder on the surface of the ceramic body is greatly reduced, and the influence of the wax removal powder on the subsequent use of the ceramic body is reduced.

The utility model discloses a logistics trolley of an intelligent logistics system with infrared detection, which comprises an AGV trolley, the bottom of one side of the AGV trolley is connected with a mounting plate, the middle part of the mounting plate is provided with an infrared distance measuring sensor, and the surface of one side, close to the infrared distance measuring sensor, of the AGV trolley is provided with a dust brushing mechanism. The dust brushing mechanism comprises a mounting box, a rotating shaft rotationally mounted on one side of the mounting box and a vertical rod connected to one end of the rotating shaft, a fixing piece is fixedly connected to one side of the vertical rod, a dust removal banister brush is arranged on one side of the fixing piece, a bottom transverse plate is connected to the bottom of the mounting plate, and an air blowing pipe is mounted at the top of the bottom transverse plate; according to the logistics trolley of the intelligent logistics system with the infrared detection function, the whole logistics trolley can automatically and periodically sweep the sensing end of the infrared distance measuring sensor and blow dust to the sensing end of the infrared distance measuring sensor, coverage of dust and dirt is reduced, and therefore the detection accuracy is guaranteed.

The invention relates to the technical field of medical instruments, in particular to a respirator mask capable of preventing pressure injury. Comprising a mask mechanism, a sliding mechanism and an adjusting mechanism, the sliding mechanism is movably mounted on the right side of the surface of the mask mechanism, the adjusting mechanism is movably mounted on the lower surface of the sliding mechanism, a cover is arranged on the right side of the surface of the mask mechanism, and an adjusting plate is mounted on the surface of the sliding mechanism; the cover is rotatably adjusted at the center of the lower surface of the adjusting plate through a bearing, and the cover and the adjusting plate synchronously slide up and down on the right side of the surface of the mask mechanism through a sliding mechanism. Meanwhile, the arranged clamping piece extends out, and after the cover cap is subjected to angle adjustment and corresponds to the nostrils of the patient, the clamping hooks arranged on the two sides of the surface of the cover cap are synchronously bent and further correspondingly clamped with the surface of the clamping piece, so that the whole cover cap is effectively fastened on the surface of the lining plate, and the clamping and fastening effects are achieved; and the normal oxygen uptake operation of the patient is ensured.

The utility model relates to the technical field of electric dust removers, in particular to a wet-type electric dust remover. According to the technical scheme, the wet-type electric dust remover comprises a connector, a shell, an electrode assembly and a sleeve, the electrode assembly is installed in the shell, a through hole is formed in the shell, a baffle is installed at the position, located at the through hole, of the interior of the shell through a torsional spring, the sleeve is installed at the position, located on the outer side of the through hole, of the shell, the connector is installed in the sleeve, and the connector is fixedly connected with the shell. A pressing plate is arranged on the connector, the connector is elastically installed in the sleeve through the pressing plate and a spring, and a spray head is installed at the tail end of the sleeve. By optimizing the layout, increasing the capturing surface area, preventing pollution, improving the stability, optimizing the water spraying system and the like, the performance and the reliability of the dust remover are effectively improved, and the dust control requirements in various industrial environments are met.

The utility model discloses a computer flat cable automatic detection device, and relates to the technical field of computer detection equipment. The utility model discloses an automatic detection device for a computer flat cable, and the device comprises a detection platform which is used for installing a to-be-detected computer; the number of the supporting columns is four, the four supporting columns are distributed on the outer edge of the detection table in a rectangular array mode, and a mounting table is arranged at the free ends of the supporting columns; the detection assembly is installed on the installation table, the detection assembly is right opposite to the table top of the detection table, and the detection assembly is used for detecting a to-be-detected computer; wherein a detection channel is arranged between every two adjacent supporting columns.

The invention discloses a two-dimensional perovskite resistive random access memory device based on an ionic liquid solvent and a preparation method of the two-dimensional perovskite resistive random access memory device, and relates to the technical field of semiconductor materials and functional devices. The resistive random access memory sequentially comprises a glass substrate, a bottom electrode, a two-dimensional perovskite resistive layer and a top electrode from bottom to top. Wherein the resistive layer thin film is a process of preparing a perovskite thin film in air by adopting a solution method. The preparation method of the memory comprises the following steps: spin-coating a butylamine acetate solution dissolved with PbI2 on the surface of a pretreated bottom electrode; and evaporating a metal electrode on the surface of the perovskite thin film layer. The raw materials adopted by the invention are easy to obtain, the preparation process is simple, environment-friendly and high in operability, and the prepared resistive random access memory is simple in structure, low in operation voltage and excellent in performance, the switching ratio can reach 104, and has typical nonvolatile storage characteristics of cyclic reading and writing.

The invention discloses an antimony-gold concentrate flotation antimony removal process, belongs to the technical field of ore flotation, and aims to solve the technical problem that the gold enrichment performance and antimony removal performance of antimony-gold concentrate flotation need to be further improved in the prior art. According to the method, a step-by-step interface regulation and control system composed of an arsenic directional collecting agent, an antimony selective collecting agent and a lead chelating dispersing agent is constructed, and interface substrate reforming, target phase interface recognition strengthening and terminal interface convergence are sequentially achieved in ore pulp, so that a flotation layering environment with gradient selectivity is formed; according to the technical scheme, the interface stability of associated impurities such as arsenic, antimony and lead can be weakened step by step while interface activation of gold particles is kept, and efficient purification of refractory gold concentrate is achieved.

The utility model discloses an environment-friendly alloy smelting device, and relates to the technical field of alloy smelting devices. The environment-friendly alloy smelting device comprises a base and alloy smelting equipment, the refining agent adding assembly comprises a fixing frame, the inner wall of the fixing frame is fixedly connected with two connecting rods, the surfaces of the two connecting rods are slidably sleeved with a connecting frame, and the inner wall of the connecting frame is fixedly connected with a mixing tank; the upper end of the mixing tank is fixedly connected with a smashing tank, the surface of the mixing tank is fixedly connected with a low-frequency electromagnetic heating coil, the surface of the rotating shaft is fixedly connected with stirring blades, and through movement of the mixing tank, a smelting agent can be conveniently added to different positions of the surface of the alloy smelting equipment, and the surface of molten liquid can be evenly covered with the smelting agent; a layer of protective film can be quickly formed, the contact between an aluminum alloy melt and air is reduced, the degree of oxidation burning loss is reduced, meanwhile, the distribution uniformity of a smelting agent in the aluminum alloy can be improved, and the refining quality and the refining efficiency of the aluminum alloy are improved.

The utility model provides a photovoltaic frame beam, a photovoltaic frame and a photovoltaic assembly, and relates to the technical field of solar assemblies. The photovoltaic frame beam comprises a rectangular base frame and two bearing beam groups, wherein one frame beam body of the rectangular base frame is used as a first base beam body; the bearing beam set comprises bearing beam bodies and limiting beam bodies which are connected to the outer wall of the first base beam body and arranged at intervals in the width direction of the first base beam body, and glue blocking beam bodies are arranged at the ends, away from the first base beam body, of the bearing beam bodies. The glue blocking beam body extends towards one side of the limiting beam body, defines a glue overflowing groove with the bearing beam body and the limiting beam body, and forms a glue overflowing opening with one end, deviating from the first base beam body, of the limiting beam body; the two bearing beam sets are arranged at intervals in the width direction of the first base beam body, and the limiting beam bodies of the two bearing beam sets are oppositely arranged to form inserting grooves. The photovoltaic frame beam is applied to a photovoltaic frame and a photovoltaic module, and does not generate excessive glue during assembly, so that the labor cost and the cost of cleaning materials are reduced, and the processing convenience and the processing efficiency of the photovoltaic frame and the photovoltaic module are improved.

The utility model relates to an intelligent insect condition monitoring device which is characterized by comprising a top cover, a supporting column and an intelligent monitoring box which are sequentially connected from top to bottom, a trap lamp and a lampshade are arranged between the top cover and the intelligent monitoring box; an automatic insect trap is arranged in the intelligent monitoring box; the automatic insect trap comprises an insect sliding funnel arranged at the top of the intelligent monitoring box and a low-pressure processing bin arranged in the intelligent monitoring box; an air inlet section and an air outlet section are respectively arranged on the left and right sides of the low-pressure treatment bin; an outlet in the bottom of the insect sliding funnel is connected to the air inlet section through a conveying pipe; the conveying pipe is provided with a bladeless fan; when the intelligent insect situation monitoring device operates, airflow blown out of the bladeless fan is blown into the low-pressure treatment bin in an obliquely upward mode along the conveying pipe, and after penetrating through the middle of the low-pressure treatment bin and the airflow filtering module, the airflow is pumped away from the draught fan and discharged out of the low-pressure treatment bin. The technical problems that an existing intelligent pest situation monitoring device is poor in sorting effect on pests of different body types, and the pest bodies are prone to stacking and covering are solved.

This invention provides a graded embolization protection device, belonging to the field of vascular interventional medical device technology. The device includes a delivery guidewire, with multiple protection units fixedly arranged at intervals at the distal end of the guidewire. Each protection unit has a proximal open end and a distal closed end, and each protection unit has a flexible support frame for support at a target location. Multiple open areas are formed on the support frame, and a soft, elastic filter membrane is arranged on the edge of each open area or on the sidewall of the entire support frame to cover the open area. In use, the multiple protection units are axially deployed graded along the target location, with the flexible support frame of each protection unit fully conforming to the inner wall of the blood vessel, and the soft, elastic filter membrane intercepting emboli in the blood flow. This addresses at least the technical problems of existing embolization protection devices, such as poor flexibility due to the high coverage of the rigid support structure, difficulty in adapting to complex vascular morphologies, and poor fit with the vascular wall, leading to embolism escape.

This invention relates to the field of methane catalytic cracking for hydrogen production, and particularly to a glucose-modified activated carbon composite material, its preparation method, and its application. In this invention, activated carbon and glucose are used as the main raw materials, and a glucose-modified activated carbon catalyst is prepared through an impregnation-carbonization process. During carbonization, glucose gradually melts, dehydrates, and cracks to form carbonaceous intermediates. Simultaneously, gases such as H2O, CO, and CO2 are released. These gases activate the pore structure of the activated carbon, promoting the development of micropores and mesopores. Furthermore, the intermediates interact with the activated carbon surface, increasing the content of oxygen-containing functional groups, especially C=O-related functional groups. The resulting fluffy carbon black after glucose carbonization further enhances the initial activity during the methane catalytic cracking reaction and extends the catalytic life.

The utility model belongs to the technical field of optical cable laying, and particularly relates to an optical cable protection structure, which comprises a wire harness end protection shell and an end part protection shell, a drawing clamping cover is connected between the wire harness end protection shell and the end part protection shell in a sliding manner, and the end part protection shell is provided with an anti-tripping supporting assembly. An anti-pull-off positioning assembly is arranged on one side of the pull clamping cover; the push-pull clamping cover is pushed by pushing the operation handle, after the anti-pressing-off supporting piece is clamped to the inner side of the end head protection shell, overall installation and positioning are achieved through clamping of the anti-pressing-off point positioning clamping piece and the positioning clamping hole, and at the moment, the upper layer face and the lower layer face of the anti-pressing-off supporting piece are supported by the first supporting end piece and the composite supporting end piece respectively; a locking interception surface is formed on the buckle part of the optical cable connecting end, the buckle of the optical cable connecting end is prevented from being directly stressed to be separated from the connecting end, meanwhile, when the end protection shell and the first supporting end piece support, the coverage surface of the optical cable end is reduced, and the connecting point of the optical cable end is kept to be of an open structure.

A method for preparing highly dispersible polyethylene wax, relating to the field of polymer material preparation technology, solves the problems of low purity, poor dispersion performance, and uneven particle size in existing polyethylene wax technologies. The method uses high-purity ethylene as the monomer, ultrapure cyclohexane as the solvent, and a metallocene-alkylaluminum catalytic system. The process involves pretreatment in a reaction vessel, segmented temperature and pressure controlled polymerization, catalyst quenching, high-speed centrifugation, multi-stage deep purification, vacuum drying, antioxidant blending, inert protective airflow pulverization, and stearic acid surface modification. The beneficial effects are: the prepared polyethylene wax has a metal impurity content ≤10ppm and volatile matter ≤0.1%, significantly lower than products from traditional processes; the particle size is precisely controlled within 2-8μm, with uniform particle size distribution and no coarse particles.