31results about How to "Increase the inner surface" patented technology

An improved tool and method for enhancing the surface of a heat transfer tube are provided. The tool, which can be easily added to existing manufacturing equipment, includes cutting bits that may be retracted with a housing. The cutting bits include a cutting edge to cut through the surface of a tube and a lifting edge to lift the surface of the tube to form protrusions. A method for enhancing the inner surface of the tube includes mounting a tool on a shaft, positioning the tool in the tube and causing relative rotation and axial movement between the tube and the tool to cut at least partially through at least one ridge formed along the surface of the tube to form ridge layers and lift the ridge layers to form protrusions.

A turbine airfoil has a suction side wall and a pressure side wall of an airfoil cavity, through which a cooling fluid flows for cooling of the side walls. The suction side wall has one or more protrusions extending therefrom into the airfoil cavity. The protrusions are arranged such that: a number of the one or more protrusions on the suction side wall is higher than a number of protrusions on the pressure side wall; and / or a protrusion density on the suction side wall is higher than a protrusion density on the pressure side wall, and / or a total protrusion surface area on the suction side wall is larger than a total protrusion surface area on the pressure side wall, so that the heat transfer from the suction side wall to the cooling fluid is higher compared to that of the pressure side wall during operation of the turbomachine.

A small-diameter drill for deep hole drilling is provided which is capable of inhibiting the cutting chips from getting bitten and producing a straightness for a drilled hole, thus suitable for drilling a hole having a depth (L) which is 15 or more times the diameter (D) of a drilled hole. The small-diameter drill 1 has a diameter 2 which is 1 mm or less and a drill section 5 including cutting edge(s) 3 and flute(s) 4. The length 11 of the flute 4 is at least 5 times and at most 10 times the drill diameter 2. The diameter of the drill section 5, after being reduced in diameter from the cutting edge 3 toward the rear of the drill section 5, is expanded in diameter so that the outer diameter at the end of the flute 4 becomes at least 0.9 times and at most 0.98 times the drill diameter 2. An expanded-diameter portion 10 is provided between the drill section 5 and a neck section 6 connected to a shank 7 and is expended in diameter from the outer diameter at the end 9 of the flute 4 up to 1 or less times the drill diameter 2. The diameter of the neck section 6 is smaller than the drill diameter 2, and the length 12 of the neck section 6 is 10 or more times the drill diameter 2.

A liquid crystal panel is provided that has a liquid crystal layer sandwiched between a pair of substrates, wherein the liquid crystal layer comprises a liquid crystal and a cross-linked resin, the cross-linked resin comprises a cross-linked structural part adhered to a liquid crystal layer contacting surface and a terminal part rising from the liquid crystal layer contacting surface, and at least one of three conditions: the outer surface of at least one substrate is curved; a liquid crystal layer contacting surface is curved; and the thickness of one of the substrates is not more than ½ of the thickness of the other substrate, is satisfied. It is possible to obtain a liquid crystal panel having increased freedom in the appearance, device weight reduction, simplified structure, etc. by improving the outer and / or inner surfaces of the device.

A turbine airfoil for a turbomachine is provided. The airfoil includes a suction side wall and a pressure side wall bordering an airfoil cavity, which receives a cooling fluid for cooling the airfoil. The suction side wall includes one or more protrusions extending inside the cavity. The number of protrusions on the suction side may be higher than the number of protrusions on the pressure side. The density of protrusions on the suction side may be higher than the density of protrusions on the pressure side and / or the surface of protrusions on the suction side may be larger than the surface of protrusions on the pressure side, so that heat transfer from the suction side to the cooling fluid is higher compared to heat transfer from the pressure side to the cooling fluid during operation of the turbomachine.

The invention relates to methods and apparatus for manufacturing implantable medical devices, such as intravascular stents, wherein the medical device has a surface treated to promote the migration of endothelial cells onto the surface of the medical device. In particular, the surface of the medical device has at least one groove formed therein, the at least one groove may have a drug-eluting polymer disposed therein or a drug-eluting polymer coating may be provided on the surface of the medical device and grooves formed in the drug eluting polymer coating.

The invention belongs to the technical field of the conservation of horticultural plants, the technical deficiencies of the technique of hole punching in the tree trunk in the infusion process of the tree trunk, the high reliance on electricity in the prior art, the increase in the number of wounds on the trunk skin and the like are fixed. In particular, a tree trunk punching machine and an application thereof are provided. The punching machine comprises a machine frame, a transmission device and a fixing device. When the punching machine is in use, an axle sleeve is firstly fixed well on the machine frame, a drill is fixed on a transmission shaft, then the transmission shaft is encased in the axle sleeve, fixed holes are threaded with rope stripes, the punching machine is fixed on the main trunk, the control feet are wrung, after the angle of hole is adjusted well, the rope stripes are buckled tightly, the crank hand is turned, the punching work is conducted, after the impelled depth is fit, the crank hand is reversely turned, and the drill is backed out of the main trunk, and the punching work of the main injection hole is completed easily. When the tree trunk punching machine is used, electricity is not required; the tree trunk punching machine is widely applied in the tree trunk transfusion of big tree transplanting in landscaping, fruit tree pest control and the like, the machine is simple in structure, flexible in operation, and easy to promote.

The invention discloses a preparation method of a moisture-proof high-energy biomass granular fuel, belonging to the technical field of biomass fuels. The moisture-proof high-energy biomass granular fuel is prepared by using activated sludge to carry out hydrothermal treatment on biomass raw materials plant straw powder and the like, using digested sludge to position and synthesize energetic polymers, and after the components are mixed, granulating, and organically combining the biomass energy activated sludge, nitrated sludge and the plant straw powder, and the produced biomass granular fuelhas good adhesion, high calorific value, high combustion efficiency and small combustion pollution, the construction of the ecological environment is facilitated, by proper addition of some charcoal slag powder, the combustion effect can be enhanced, and the combustion heat value can be improved. In addition, through combination and matching of various raw materials including the nitrated sludge,an activator, polyethylene glycol nitrate and the like in the fuel, the storage of the fuel can be facilitated, the fuel is prevented from being affected with damp and moisture regain, the combustionquality is further improved, and the problem of poor combustion heat value caused by the fuel being affected with damp can be simultaneously avoided.

Provided is a pneumatic tire whose safety factor and durability are improved without generating a problem of an increase in the weight of a tire and an increase in the inner surface cord protrusion failure. Provided is a pneumatic tire including one or more carcasses 2 extending toroidally between bead cores 1 embedded in a pair of bead portions 11 respectively. A polyester fiber cord whose total decitex as a twisted cord is 4300 to 5100 dtex, whose cord strength as a dip treated cord is 6.5 to 7.2 cN / dtex and whose cord elongation at a stress loading of 2 cN / dtex is 3.5 to 4.0% is used as a reinforcing cord of the carcass 2, and the tenacity of a treat which is the reinforcing cord covered with rubber per unit width is 2.9 to 3.2 kN / cm.

In this flat extruded aluminum multi-port tube, the corrosion-resistance, at inner surfaces of a plurality of flow passages independently and parallelly extending in the tube axial direction, is effectively enhanced. In a flat extruded aluminum multi-port tube 10 formed by an extrusion by employing an aluminum tube material and an aluminum sacrificial anode material having an electrochemically lower potential than the aluminum tube material, the aluminum sacrificial anode material is exposed to form a sacrificial anode portion 18 at least in a part of an inner circumferential portion in each of the plurality of flow passages 12.

Provided is a pneumatic tire whose safety factor and durability are improved without generating a problem of an increase in the weight of a tire and an increase in the inner surface cord protrusion failure.Provided is a pneumatic tire including one or more carcasses 2 extending toroidally between bead cores 1 embedded in a pair of bead portions 11 respectively. A polyester fiber cord whose total decitex as a twisted cord is 4300 to 5100 dtex, whose cord strength as a dip treated cord is 6.5 to 7.2 cN / dtex and whose cord elongation at a stress loading of 2 cN / dtex is 3.5 to 4.0% is used as a reinforcing cord of the carcass 2, and the tenacity of a treat which is the reinforcing cord covered with rubber per unit width is 2.9 to 3.2 kN / cm.

A bell jar includes a metallic bell jar (1), and a metallic base plate (2) on which the bell jar (1) is placed, and packing (3) seals an inside of a container. To the base plate (2), a pressure gauge (4), a gas introduction line (5), and a gas discharge line (6) are connected so as to allow monitoring of internal pressure of the bell jar (1) and introduction and discharge of a gas. A vacuum pump (7) is provided in a path of the gas discharge line (6), and the vacuum pump (7) reduces internal pressure of the bell jar so as to be lower than vapor pressure of water. The vacuum pump (7) reduces the internal pressure of the bell jar so as to be lower than vapor pressure of water, thereby efficiently removing moisture, and completing drying of the bell jar in a short time.

The invention discloses a method for preparing a composite high-energy biomass fuel rod. The invention belongs to the technical field of biomass fuel. The invention uses silica aerogel to carry out loading treatment on biomass straw powder, etc. to increase the fuel contact surface area. The organic combination of inorganic and plant straw powder can produce biomass fuel rods with good cohesiveness, high heat energy value, large surface area, high combustion efficiency, and low combustion pollution, which is conducive to the construction of the ecological environment and can be beneficial to the production of fuel. For storage, there is a sufficient combustion contact area and can avoid the fuel from getting damp and regaining moisture, thereby improving its combustion quality, and at the same time avoiding the problem of poor combustion heat value caused by the fuel being damp.

A storage space device for the transport and / or storage of nuclear materials, comprising a main structure defining at least one housing intended to contain the nuclear materials and includes a mobile heat conduction structure forming at least one portion of a side outer surface of the storage space device. The mobile structure has at least one mobile heat conduction component mounted on the main structure so as to be displaceable reversibly from a retracted position to a deployed position while moving away from the structure.

A piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, having a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar. The outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal direction towards the piercing mandrel main body in order to increase the durability of the piercing mandrel when used for piercing round blocks of metal, in particular higher-alloyed steel materials which are difficult to work, by means of skew rolling providing a qualitative improvement of the inner surface of the pierced round block and reducing tool costs.

A modified cellulose / polylactic acid composite preparation method belongs to the technical field of biomass energy chemical engineering and comprises the following steps: hemicellulose of maize straw is hydrolyzed through acid, and then maize straw is pretreated by alkaline-soluble lignin to prepare a cellulose precursor; the cellulose precursor is crushed and dispersed to prepare fibrillation cellulose, and then fire-retardant impregnation and low-temperature oxidation treatment are performed to obtain dehydroxylation cellulose; dehydroxylation cellulose is scattered, and low-temperature carbonization is performed to prepare carbon fibers; the fibrillation cellulose is oxidized by sodium hypochlorite to prepare carboxylated cellulose, and carboxylated cellulose and polyethylene glycol are esterified to prepare esterified cellulose; and dehydroxylation cellulose, the carbon fibers and the esterified cellulose are added into an internal mixer to be subjected to kneading mixing with polylactic acid, and an open mill is adopted for homogenization scattering to prepare a modified cellulose / polylactic acid composite. Cellulose is modified by different methods, particularly mechanical scattering and crushing, flame-retardant impregnation, low-temperature oxidation, high-temperature carbonization, carboxylation and esterification, so that the strength and the mobility of cellulose are improved, and the polylactic acid interfacial compatibility is improved.

A piston bolt may include an axial opening and at least one reinforcement rib may be arranged on an inner surface of the opening. The at least one reinforcement rib may be helical in conformation or may include a plurality of reinforcement ribs forming a honeycomb pattern.

The invention relates to methods and apparatus for manufacturing implantable medical devices, such as intravascular stents, wherein the medical device has a surface treated to promote the migration of endothelial cells onto the surface of the medical device. In particular, the surface of the medical device has at least one groove formed therein, the at least one groove may have a drug-eluting polymer disposed therein or a drug-eluting polymer coating may be provided on the surface of the medical device and grooves formed in the drug eluting polymer coating.