97results about How to "Avoid thermal effects" patented technology

A wafer carrier assembly for use in a system for growing epitaxial layers on one or more wafers by chemical vapor deposition (CVD), the wafer carrier assembly includes a wafer carrier body formed symmetrically about a central axis, and including a generally planar top surface that is situated perpendicularly to the central axis and a planar bottom surface that is parallel to the top surface. At least one wafer retention pocket is recessed in the wafer carrier body from the top surface. Each of the at least one wafer retention pocket includes a floor surface and a peripheral wall surface that surrounds the floor surface and defines a periphery of that wafer retention pocket. At least one thermal control feature includes an interior cavity or void formed in the wafer carrier body and is defined by interior surfaces of the wafer carrier body.

The present invention relates to methods and systems for dynamically controlled laser amplifier configuration for composite cutting includes the steps of generating an initial wavelength-swept-with-time optical pulse in an optical pulse generator, amplifying the initial optical pulse, compressing the amplified optical pulse to a duration of less than 10 picoseconds and applying the compressed optical pulse on the composite with an ablating energy density, to controllably remove a slice of material from the composite.

The invention provides 'core-shell-shell' rare earth upconversion nanoparticles (UCNPs) using Nd as a sensitizing agent. The rare earth UCNPs are characterized in that the shell layer of the rare earth UCNPs contains Nd<3+> and each layer contains Yb<3+>. The special microscopic nanostructure solves the problem about the quenching effect on upconversion fluorescence in an Nd doping process, so bright upconversion fluorescence can be obtained. Compared with the traditional Yb-sensitized UCNPs, the Nd-sensitized UCNPs have higher infrared absorption intensity so as to greatly improve upconversion efficiency and fluorescence. The Nd-sensitized UCNPs adopt 800-nanometer instead of 980-nanometer laser as an exciting light source, so the Nd-sensitized UCNPs have smaller overheating effect and stronger biological tissue penetrating power. Therefore, the novel rare earth upconversion material is expected to be widely applied in the field of biomedicines.

The present invention relates to rare earth upconversion nanoparticles, a preparation method and uses thereof, wherein the rare earth upconversion nanoparticles sequentially comprise an activator shell layer, an energy transfer agent shell layer and a sensitizing agent shell layer from inside to outside, each layer contains Yb<3+>, and the doping concentration of Yb<3+> is gradually reduced from inside to outside. According to the present invention, the ytterbium ion doping concentration gradient is set to effectively transfer the excitation state energy of the sensitizing agent to the activator, such that the upconversion luminescence quantum yield of the rare earth upconversion nanoparticles is effectively improved and achieves 0.22%, and the 800 nm continuous laser excitation at the excitation light source intensity of 2W/cm<2> is achieved; and the rare earth upconversion nanoparticles can produce strong upconversion luminescence under the infrared LED light source excitation, and the potable detection equipment based on the rare earth upconversion nanoparticle luminescence probe can be designed by using the unique packaging and array technology of the infrared LED light source so as to further expand the application of the upconversion luminescence material in the biomedical field.

The invention provides a wireless power charger comprising a wireless and a power bank. The wireless charging base including a wireless transmitter configured to transmit an identification signal. The power bank is electrically connected to a portable device including a first rechargeable battery, and the power bank including a second rechargeable battery, a wireless receiver, and a control unit. The wireless receiver is configured to receive the identification signal and transmit a response signal to the wireless transmitter while the power bank is placed onto the wireless charging base. The control unit is configured to control and output the power to the first rechargeable battery or the second rechargeable battery.

In a stratified-scavenging two-stroke internal combustion engine, air-fuel mixture outlets (14b) and air outlets (15b) are provided on either side of a cylinder (3), and the air-fuel mixture outlets (14b) and the air outlets (15b) communicate with a crank chamber (6) via air-fuel mixture passageways (14) and air passageways (15). The crank chamber (6) is charged with air from an air-feeding port (12). An inlet port (10) is disposed on either side of the air-feeding port (12), and mixture (M) from each inlet port (10) is charged into the air-fuel mixture passageways (14) via air-fuel mixture introduction recesses (17) formed in the outer surface of a piston (2). The air outlets (15b) are positioned nearer to the exhaust port (11), while the air-fuel mixture outlets (14b) are positioned nearer to the inlet ports (10). In the exhaust stroke, the cylinder chamber (7) is scavenged via air (A) supplied from the crank chamber (6) through the air outlets (15b) and interposed between the combustion gas (E) in the cylinder chamber (7) and the mixture (M) from the air-fuel mixture outlets (14b).

The invention provides a laser surface micro-processing tip and the preparation method thereof. The laser surface micro-processing tip is a metallographic structure, on the tip surface of which a micro-geometrical structure composed of a micro-pit or a cross groove and the combination thereof is formed, wherein the geometric parameters of the pit-shaped micro-geometrical structure are as follows: the pit radius rp is equal to 20 to 80 Mum, the pit depth hp is equal to 2 to 20 Mum, and the adjacent pits space L is equal to 50 to 200 Mum; the geometric parameters of the cross groove-shaped micro-geometrical structure are as follows: the groove width B is equal to 50 to 150 Mum, the groove depth is equal to 5 to 20 Mum, the adjacent groove space D is equal to 400 to 600 Mum, and the groove inclination angle A is equal to 30 DEG to 75 DEG. Since the tip surface is subjected to the laser micro-processing treatment, the laser surface micro-processing tip remarkably improves the wear-resisting performance, improves the lubricating conditions of the tip in the work-piece center hole and reduces the frictional noise, and at the same time, the stored lubricant can be effectively cooled, thereby prolonging the service life of the tip.

The invention discloses a method for manufacturing a CNT (carbon nanotube) composite transmission conductor, which comprises the following steps: filling MCNT (multiwalled carbon nanotube) powder accounting for 1 to 7 percent of the total mass into small holes uniformly drilled on electrotechnical aluminium blocks; stacking two aluminium blocks in which the MCNT powder has been filled inversely by using a blind-hole method; after the two aluminium blocks are prepared into composite materials through a friction extrusion process, carrying out tandem rolling and drawing on the composite materials so as to prepare the composite materials into required CNT/aluminum based composite material round wires; and finally, stranding the round wires by a wire twisting machine, then through a back-twisting stress eliminating device, obtaining a single-stranded CNT composite transmission conductor. The method of the invention has the advantages: 1) the coefficient of linear expansion of the conductor is small, and the thermal deformation resistance performance is strong, the method can reduce the influence of the temperature on sag change, improve the sag characteristics, improve the security of overhead lines, and reduce the construction cost of the lines; 2) the method is helpful to improve the conductivity of the conductor along the line, and further reduce the transmission losses; and 3) the process is relatively simple, and the loosening and skid phenomenon and the like of composite cores and aluminium strands due to various reasons do not exist.

The invention provides a device for machining small holes by using ultrashort pulse laser and a small hole machining method. The device comprises a scanning galvanometer, a laser scanning focus lens and a wedge lens. The scanning galvanometer, the laser scanning focus lens and the wedge lens are arranged on the same central axis. A laser beam rotates around the central axis along a concentric circle track through the scanning galvanometer, is focused through the laser scanning focus lens and is deflected far away from the central axis through the wedge lens. The wedge lens and the laser beam rotate synchronously to keep the inclination angle of the laser beams to be the same. The device for machining small holes by using ultrashort pulse laser and the small hole machining method have the advantages that the small hole machining depth is increased and the machining quality and stability of the small holes are improved.

A temperature isolation duct in a computer system comprising a chassis securing a circuit board and a fan system, wherein the fan system draws air through the chassis in an airflow direction, and a heat-generating component is mounted on the circuit board and exposed to the air flow. The hot air duct passively directs air heated by the heat-generating component from a single hot air duct inlet in direct downstream alignment with the heat-generating component to a single hot air duct outlet, wherein the hot air duct has a length to width aspect ratio of greater than four. A first thermal sensor is secured within, or direct alignment with, the hot air duct near the duct outlet for sensing the temperature of air flowing through the hot air duct and generating a first temperature signal. A controller is in electronic communication with the first thermal sensor for receiving the temperature signal and in electronic communication with the fan system for sending a fan speed control signal. Optionally, the hot air duct may extend through, over or around a second component on the circuit board to avoid thermal effects of the second component.

The manufacture process of superthin high-refractivity optical resin lens includes the following steps: making mold, reinforcing treatment and closing mold with tape machine; weighing chemical monomer and initiator, mixing and vacuum deairing; depositing the mixture in the mold, curing to form, demolding and cleaning. The present invention features the chemical monomer with one kind of alkenyl radical containing organic compound additive, the initiator being tert-butyl peroxide, the ratio among the chemical monomer, the additive and the initiator of 100 to 0.1-0.3 to 0.7-0.9, computerized temperature control during the polymerization, and the secondary curing of lens after demolding and cleaning. The present invention eliminates the lens profile variation caused by the polymerization and raises the optical precision of the lens.

The invention relates to the technical field of traditional Chinese medicine preparation process, in particular to a cinnamon twig and poria composition and a preparation method thereof. The cassia twig and poria composition is designed to overcome the problems that the treatment effects of drugs in the prior art are not ideal, the drugs can not be prepared against the characteristics of active ingredients of the drugs and the loss of the active ingredients is great, the currently provided technical proposal is that: the cassia twig and poria composition is prepared by using the following method: five medicines of cassia twig, poria, peach seed, red paeony root and tree peony bark with equal quantity are taken and screened by a 10 to 24-mesh sieve; the four medicines of the cinnamon twig, the tree peony bark, the red paeony root and the peach seed are mixed and extracted, extract is collected for standby; the medicine residues are mixed with the poria for carrying out alcohol extraction and then carrying out water extraction, filtrate is merged, and liquid extract is obtained by the concentration; the liquid extract and the extract are merged, and a preparation is prepared by even mixing and processing. Compared with the prior art, the cinnamon twig and poria composition has the advantages that: 1. the treatment effect of the drug is improved; 2. the preparation process is reasonable; 3. and the cassia twig and poria composition has significant realistic significance.

An lubrication device for an engine includes: a crank case which freely rotatably supports a crank shaft and also which stores oil at its lower part; an oil strainer which is so arranged as to be fixed in the crank case; and an oil pump which suctions the oil at the lower part in the crank case via the oil strainer. In the lubricating device, the machining efficiency can be improved by reducing the time of machining to a crank case to thereby decentralize machining processes, and also the oil temperature can be reduced. A crank case cover covering part of a crank case and coupled with the crank case is provided with an oil suction passage which leads to an oil pump, and an oil strainer communicates with the oil suction passage via a connecting pipe which is a member different from the crank case

A guide for a traveling transmission medium such as a timing chain comprises a resin shoe for sliding contact with the transmission medium, supported on a base frame having an two flanges and a web in an I-shaped cross-section. The base frame is produced from aluminum by die casting, using a three-part mold. Two parts of the mold cooperate to form a part of the mold cavity that forms one of the flanges and the web of the base frame, and a third part of the mold cooperates with the first two parts to form a part of the cavity in which the other flange of the base frame is formed without a draft.

A cold-cathode ray tube is adopted as an exposure lamp and the exposure lamp is always lit. When the exposure lamp exists at a standby position, a light of the exposure lamp is irradiated at a lower surface side of a control panel. By this irradiation, the liquid crystal display section of the control panel is irradiated in a state of looking bright and clear.

The invention provides a method for detecting the distribution of deuterium particle beams. The method is characterized by comprising the following steps: (1) arranging a CR-39 solid state nuclear track detector on the rear surface of a deuterium target or a tritium target of an accelerator based neutron source; (2) recording a number of tracks on the surface of the CR-39 solid state nuclear track detector after the accelerator based neutron source is irradiated by a microscope; and (3) by a mapping relation between a deuterium particle number N on the surface of the deuterium target or the tritium target and the number X of the tracks on the surface of the CR-39 solid state nuclear track detector, inverting the distribution of the deuterium particle beams by the number X of the tracks. According to the method, the measurement on the distribution of the deuterium particle beams can be implemented and the interference of impurity particles is effectively avoided; the distribution of high-current deuterium particle beams in an order range of milliampere to ampere can be measured; and the thermal effect generated by energy deposition in the direct action process of the high-current particle beams and the CR-39 solid state nuclear track detector is effectively overcome.

In this invention, along its light-pass, arranged respectively are: first cavity resonator mirror, latch crystal, spherical surface folding mirror; and along the reflection light-pass of said spherical surface mirror arranged respectively are: frequency doubling crystal and second cavity resonator mirror. Pumping light source is placed by the side of lath crystal for pumping it. In this invention, lath crystal is used as activated material, folding cavity for inner cavity frequency doubling, and lath crystal for overcoming heat effect. Advantages are: astigmatism produced by two effects in resonator can be compensated by regulating turning angle of spherical surface folding mirror.

The invention discloses a method for extracting total flavonoids from psidium guajava leaves. The method is characterized by comprising the steps of putting the psidium guajava leaves in an aqueous solution of a surfactant, carrying out extraction under the assistance of microwaves and ultrasonics, and then, carrying out solid-liquid separation, thereby obtaining an extract containing the total flavonoids, wherein the mass percent of the surfactant in the aqueous solution of the surfactant is 1% to 3%, the microwave power is 100W to 150W, and the ultrasonic power is 600W to 650W. According the method, an organic solvent is replaced with an aqueous solution, and the wetting and solubilization actions of the surfactant, a bulk-heating principle of microwave extraction and an cavitation effect of the ultrasonics are fully combined, so that the traditional problem, i.e., organic solvent residue is solved, meanwhile, the extraction time can be greatly shortened, the extraction ratio is increased, the production cost of enterprises is reduced, and the method has a broad popularization prospect.

The invention discloses a solar battery comprising a first electrode, a first photosensitive layer, a second photosensitive layer, a second electrode and a lower conversion layer, which are sequentially arranged from the bottom up. The first photosensitive layer and the second photosensitive layer form an electron donor-electron acceptor heterojunction. The solar battery disclosed by the invention has high utilization ratio of a solar spectrum, the problem of the thermal effect of current carriers is overcome, and the energy conversion efficiency of the solar battery is largely increased.

A casing of a fuel cell system is divided into a module area, a fluid supply area, and an electric parts area. The fluid supply area is provided on a first side surface of the module area, and an electric parts area is provided on a second side surface of the module area. A fuel cell module and a combustor are provided in the module area.