454results about How to "Reduce buoyancy" patented technology

A magnetic hard disc substrate made of an aluminum alloy for memory devices such as a computer must correspond to an improved structure in which the interval between a head and a medium is made narrower to attain high density recording. In order to prevent head crash, it is required that the magnetic hard disc substrate have a smooth surface and decreased defects. The present invention provides a process for manufacturing a magnetic hard disc substrate made of an aluminum alloy which satisfies the above requirements and also provides a disc substrate which has a surface roughness Ra</=0.5 nm and is free from abrasive flaws with a depth of 5 nm or more and from micro-waviness or provides a disc substrate which has a surface roughness Ra</=5 angstroms and a surface roughness Rmax</=80 angstroms and in which the number of scratches with a depth of 50 angstroms or more is 5 or less and the number of pits with a depth of 50 angstroms or less is 5 or less in the surface.

A universal underwater enclosure has a spherical shell having a hollow in which a camera, camcorder, or other device can be inserted, a lens attached to the shell that can be opened to insert a device, and glove assemblies extending into the hollow for manipulation of a device placed therein. The glove assemblies have fingers and not full gloves, reducing the dimensions of the enclosure—thereby minimizing buoyancy. A mounting system attaches to a device's tripod mount receptor, fixes the device, and allows it to be adjusted in three dimensions. A pressure equalization system relieves stress on the enclosure, which exhibits neutral buoyancy. A flash mounted on the shell operates independently of any device. Modular lens pods replace the lens to accommodate various other lenses. The glove assemblies have perimeter lips secured to the shell by fasteners and a bezel around teardrop-shaped cut-out holes in the shell. The fingers allow access to all of a device's controls.

Apparatus is described for mooring a floating vessel (10) particularly suited to a tanker transporting liquid natural gas which needs to be moored in an offshore environment. The apparatus comprises a semi-submersible floating dock (1) a single point mooring system (5) and at least one rigid arm (3). The arm (3) is pivotally attached to one of the dock (1) and the single point mooring system (5). The arm (3) is suspended from the other of the dock (1) and the single point mooring system (5) by at least one tension member (19).

The invention relates to a high-impermeable anti-floating pile raft structure. The high-impermeable anti-floating pile raft structure is characterized in that a pre-stress hollow tube section is arranged at the upper portion of a bored pile, the pre-stress hollow tube section is concentric with the bored pile, a reinforcement cage of the bored pile penetrates through the pre-stress hollow tube section and extends into a raft foundation to be connected with a raft inner reinforcing steel bar, an inner connection rib is arranged on the inner side of the pre-stress hollow tube section, and a sand cushion layer and a gravel blind ditch are laid at the upper portion of foundation soil. The raft foundation is sequentially provided with a horizontal water-resisting layer, a cemented soil board and a reinforced concrete raft board from bottom to top. A foundation pit support pile and a wall body of a side wall of a basement are fixedly connected through reinforcing rib materials. The high-impermeable anti-floating pile raft structure can enhance the integrity and strength of an upper portion structure, can reduce uplift pressure of underground water and can fully utilize waste slurry of the bored pile to achieve waste utilization. The pre-stress hollow tube section is arranged at the top of a pile body, so that a pile cutting work process of the bored pile is removed, and the construction efficiency is improved. The invention further discloses a construction method of the high-impermeable anti-floating pile raft structure.

The invention discloses an experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding. The experimental device and experimental method forthickened oil pool mixed nano-fluid alternating CO2 microbubble flooding introduces mixed nano-particles and combines the advantages of CO2 microbubbles, the phenomena of gas channeling and gravity override of a thickened oil pool occurred during conventional CO2 gas-water alternate flooding can be effectively controlled through a mode of alternating injection, and the recovery efficiency of thethickened oil pool is improved. Compared with CO2 gas, dissolving and diffusing abilities of the CO2 microbubbles are greater in crude oil, buoyancy is smaller, thickened oil viscosity can be better reduced, the volume of thickened oil is expanded, and the sweep coefficient is increased; the mixed nano-fluid can fully combine the advantages of various nano-particles, wettability of oil pull rockscan be changed, the oil-water interfacial tension can be reduced, and the oil washing efficiency is improved; and in addition, the experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding adopts the method of injecting a mixed nano-fluid slug on the upper part of an oil pool and a CO2 microbubble slug on the lower part, controlling ofthe phenomena of the gas channeling and the gravity override and improvement of the vertical sweep coefficient are helped.

The invention discloses a tandem continuous ball mill and a ball milling method and belongs to the technical field of equipment for producing ceramic products and ball milling technologies. A feeding device (1) is communicated with a feeding end of a first-stage ball milling tank (4), wherein a plurality of second-stage ball milling tanks (7) are connected in series; the length of the first-stage ball milling tank (4) is 1.5-3 times that of one second-stage ball milling tank (7); an inner cavity of the first-stage ball milling tank (4) has a taper of which the diameter is gradually reduced from the feeding end to the discharging end. The tandem continuous ball mill can be used for materials with different sizes; the discharging mode is changed from the traditional overflow into flow extraction; in the ball milling method, materials with different particle sizes are pertinently added; after materials of which the particle sizes are 0.5-15mm are pulped, the pulped materials are directly added in each second-stage ball milling tank (7) through a connecting device (3); after materials of which the particle sizes are 0.1-0.5mm are pulped, the pulped materials are directly added in the tail-end second-stage ball milling tanks (7) through the connecting devices (3), so that the grinding efficiency is greatly improved.

In an induction heating apparatus, in order to decrease the buoyancy exerted on an object to be heated which is made of a material having high electrical conductivity and low magnetic permeability, such as aluminum, an electrical conductor is provided between a heating coil and the object to be heated, thereby increasing the equivalent series resistance of the heating coil. Hence, the current of the heating coil, which is required for obtaining a desired heating output, is decreased, whereby the buoyancy of the object to be heated can be decreased. In addition, the electrical conductor is divided into two halves, and they are arranged in a circular arc form with a clearance provided therebetween and made close contact with the bottom face of a plate, whereby the temperature rise of the electrical conductor can be restricted. Furthermore, the heat of the electrical conductor is transferred and dissipated to the object to be heated, whereby the heating coil and the like are not damaged even if the electrical conductor is heated. An electrical conductor temperature sensor for detecting the temperature of the electrical conductor is provided; when the detection temperature becomes a predetermined temperature, the heating output of a drive circuit is decreased, whereby the heat generation of the electrical conductor is decreased and the heating coil and the like are not damaged by heat.

The invention provides a method for the transport of a civil engineering structure in an aquatic medium. According to this method: at least one float is associated with the civil engineering structure in such a way as to ensure that the said civil engineering structure floats stably in an aquatic medium, the said float surrounding the civil engineering structure and a bottom portion of the civil engineering structure extending below the said float, and the civil engineering structure and the associated float are caused to move in the aquatic medium to a desired position.

The invention discloses a method of underground structure against floating, which is characterized by the following: 1)adopting the following methods; a)arranging first drained hole (7)on lower of underground structure outside wall (5); b)arranging second drained hole (8)on underground structure bottom plate (3); c)arranging the first drained hole (7)on the lower of the underground structure outside wall (5); arranging the second drained hole on the underground structure bottom plate (3); 2)arranging drained tank (2)on the inner of the underground structure exterior wall; communicating with collecting well (1)in the underground structure; 3)discharging the water in the collecting well out of the underground structure; arranging third drained hole (9)on the wall of the collecting well (1); proceeding pressure poured cement paste under the underground structure bottom plate (3); change-filling backfill soil (6)of the underground structure outside wall (5)in the zone with big creep quantity. This invention possesses the advantages of simple and firm.

The invention discloses a river section water quality monitoring system. The river section water quality monitoring system comprises a bank control base station and a monitoring box, wherein a sampling device, a water quality monitoring device and an underwater control device are arranged in the monitoring box; the sampling device is connected with the water quality monitoring device which is connected with the underwater control device, a balance stabilizing device is arranged at the upper part of the monitoring box, and a lifting control device is arranged at the lower part of the monitoring box. A river section water quality monitoring method comprises steps of (1) building the bank control base station; (2) mounting cables; (3) controlling the monitoring box to reach a river section monitoring point; (4) monitoring the river section water quality. The river section water quality monitoring system is simple in structure, high in pertinence, high in automation degree and convenient to operate; with adoption of the method, the water quality condition of the river section can be monitored in real time, the accuracy is high, information is pushed actively and remotely, remote control is realized, the water quality condition is known by a worker conveniently at any time, and the labor intensity is reduced, so that the working efficiency is increased and the economic cost is reduced.

A high-frequency semiconductor device is provided with a ceramic substrate, an element group including semiconductor elements and passive components mounted onto a bottom portion of the ceramic substrate, and a composite resin material layer formed on the bottom portion of the ceramic substrate so as to bury the element group. The composite resin material layer is formed by a composite resin material including an epoxy resin and an inorganic filler material, and has a flat bottom surface on which electrodes for connecting to the outside are formed. As packaging of a structure in which the receiving system and the transmitting system are formed in a single unit, such as an RF module, the high-frequency semiconductor device achieves a small size, a high mounting density, and excellent heat release properties.

The invention discloses a gangue inhibitor and a beneficiation method of copper sulphide ore containing easily floated gangue minerals, belongs to the technical field of flotation, and solves the problem that gangue minerals have very adverse effects on flotation of copper sulphide ore. The gangue inhibitor comprises sodium polyacrylate, carboxymethyl cellulose, Arabic gum, sodium silicate, sodiumtripolyphosphate, anhydrous sodium sulfite, sodium lignosulfonate and anhydrous zinc sulfate. The method comprises the following steps: adding lime for ore grinding, and adding water for size mixing;sequentially adding a collecting foaming agent, an auxiliary collecting agent and a collecting agent into obtained ore pulp for roughing; adding a collecting agent into obtained roughing tailings, and scavenging for the first time; adding a collecting agent into the scavenging tailings, and carrying out secondary scavenging; sequentially adding pH regulator lime and the gangue inhibitor into an obtained roughing concentrate, and carrying out primary concentration; and adding pH regulator lime into an obtained primary concentration concentrate for secondary concentration. The gangue inhibitoris capable of reducing the floatability of gangue minerals greatly; the method is capable of improving the copper grade and the copper recovery rate of rough concentrate.

The invention provides a method for separating quartz from low-grade potassium and sodium feldspar ore. The method comprises the steps of providing low-grade potassium and sodium feldspar ore powder; mixing the low-grade potassium and sodium feldspar ore powder and water for obtaining low-grade potassium and sodium feldspar ore slurry; adjusting the pH value of the low-grade potassium and sodium feldspar ore slurry to 8-10 through conditioning agents, and then carrying out roughing, scavenging, concentrating and drying on the low-grade potassium and sodium feldspar ore slurry for obtaining fine potassium and sodium feldspar powder and floating the quartz; adding activating agents, inhibitors and amine collecting agents in the roughing process and the scavenging process each time. The method has the advantages that the production cost is low, the requirement for corrosion prevention of equipment is low, pollution to the environment is small, and the quality of the obtained fine potassium and sodium feldspar powder meets the use standard GB/T9195-1999 of the ceramic industry.

The invention relates to a flexible pipe assisted type pipeline returning method. A high-intensity water isolation flexible pipe matched with a pipeline is placed in the pipeline; the flexible pipe and the pipeline are tightly installed employing an arc-shaped pressing plate and fastening bolts on the inner side of the inlet end of the pipeline; slurries in a drill hole enter in the flexible pipethrough a slurry channel of an open type pipe drawing device when the pipeline is returned; after the pipeline is returned, the slurries in the flexible pipe are pumped off from two ends of the pipeline by two submersible pumps; and the flexible pipe is taken out to finish the pipeline returning operation. The method provided by the invention can reduce slurry buoyancy acting on the pipeline whenthe pipeline is returned so as to improve stress state of the pipeline in a pipeline returning process; meanwhile, the method can improve pressure state and flow state of the slurries in the drill hole in the pipeline returning process so as to lower the risk of the pipeline returning process. The method provided by the invention is simple to operate and has the advantages of time saving, safe construction, wide application range and the like.

The invention relates to a basement anti-floating system based on a low horizontal grout curtain and depressurization through water drawing. The basement anti-floating system comprises a dewatering well structure and the horizontal grout curtain. The dewatering well structure comprises a dewatering well, a water storing pool, a water pump and a water level sensor. The dewatering well is arranged on a basement bottom plate on the periphery of a basement. The well opening of the dewatering well is directly connected to the ground. The bottom of the dewatering well penetrates into the position below the basement bottom plate. The water storing pool is arranged under the basement bottom plate and communicated with the dewatering well. The water pump and the water level sensor are arranged in the water storing pool. The water level sensor is connected with the water pump. The water level sensor is arranged under the basement bottom plate Compared with the prior art, the negativity and passivity of frequently-used methods for resisting the underground water buoyance at present are overcome, and the effect of basement anti-floating is achieved in two aspects that the buoyance of the underground water is reduced and the upper resistance for balancing the underground water buoyance is increased; the basement anti-floating system is suitable for regions where the requirement for the environment is high, the basement buried depth is large and the underground water level is high, and has good market value.

The invention discloses an interception and drainage pressure-reduction anti-floating system which comprises a waterproof curtain arranged around an underground structure. A plurality of water collecting pits are formed below a bottom plate of the underground structure. Immersible pumps and water level induction switches are arranged in the water collecting pits. Well holes are formed in the bottoms of the water collecting pits. Pressure-reduction well pipes are arranged in the well holes. Anti-filtration layers are arranged around the pressure-reduction well pipes. The tops of the pressure-reduction well pipes are higher than openings of the well holes. The anti-filtration layers are located in the water collecting pits. The pressure-reduction well pipes are mainly formed by axially and vertically stacking a plurality of non-fine concrete well rings. The non-fine concrete well rings comprise upper annular ring beams, lower annular ring beams, stand columns and non-fine concrete wedge-shaped blocks. By means of cooperative work of the system, buoyant force on the bottom plate can be effectively reduced, the drainage amount can be controlled, the surrounding is protected against surface subsidence caused by the too large drainage amount, the number of uplift piles and the number of uplift anchor rods are greatly decreased, non-fine concrete blocks can be conveniently dismounted and replaced, and it is guaranteed that a pressure-reduction well has enough durability.

The invention discloses a shield tunnel back-filled grouting auxiliary mechanism and a grouting method. A slurry inlet and a first slurry exit, communicating with a cavity, are arranged in the back end and the circumferential wall of an inner rod. A second slurry exit corresponding to the first slurry exit is arranged in a sleeve which is in screwed connection with the inner rod. An anchoring piece arranged in front of the sleeve is installed on the part, inserted into a surrounding rock layer, of the inner rod. On one hand, the slurry radially flows out through the first slurry exit and the second slurry exit, so the reactive force on the outer wall of a pipe sheet imposed by the slurry can be greatly reduced, and the floating and deformation possibility of the pipe sheet during back-filled grouting processes is reduced. On the other hand, after the anchoring piece is radially unfolded and clamped into the surrounding rock layer, end resistance can be provided for corresponding pipe sheets, and a second external thread contacts with the surrounding rock layer to provide frictional counterforce, so floating force borne by the pipe sheets can be further reduced. In addition, grouting holes are enclosed by a sealing fixing structure and the slurry flows into gaps between the sleeve and the grouting holes through the first slurry exit and the second slurry exit, so after the slurry is solidified, the slurry holes can be completely sealed.

A water submergence toy is not performed using a screw. It is done by only changing the buoyancy by means of changing the volume. Because of this, the control and surfacing responsiveness becomes very poor. The water submergence toy according to the present invention compresses the air inside a piston when the piston is pushed towards the inside of a cylinder to reduce the volume. This makes the buoyancy smaller. Conversely, when the piston is moved in a direction away from the cylinder, the volume of the air inside the piston becomes larger and the buoyancy increases. In addition, because this type of buoyancy adjustment can be performed manually as well, those who play with a water submergence toy can adjust the buoyancy whenever it is necessary. Because of this, the buoyancy of the water submergence toy can always be maintained in a state adjusted for optimum buoyancy.