994 results about "Temperature sensitivity" patented technology

The present invention provides one kind of water gel containing natural high molecular material and its preparation process. The water gel has cross-linking degree of 70-95 % and water absorption of 500-80000 %, and contains natural high molecular material or its derivative selected from chitin, chitin derivative, chitosan, chitosan derivative, carrageenin, etc. The water gel may have synthetic high molecular material, inorganic filler, cross-linking sensitizer, medicine and other assistant added. It is prepared through radiation cross-linking, with the radiation dosage being 10-40 kGy. The water gel of the present invention has high water absorption, high flexibility, good medicine slow releasing performance, and may be used in wound dressing, etc.

The invention discloses a preparation method of a lithium ion battery pole piece containing a PTC (Positive Temperature Coefficient) coating. The pole piece prepared by the method is a multilayer coated pole piece. The method comprises the following steps: before coating slurry comprising an anode or a cathode active substance onto a current collector, coating the current collector with a precoated layer with the temperature sensitivity in advance, wherein the precoated layer with the temperature sensitivity comprises ingredients of a binding agent, a positive temperature material and a conductive agent; the weight ratio of the binding agent to the positive temperature material to the conductive agent is (2-8): (1-8): (0-7). The method provided by the invention is used for preparing the lithium ion battery pole piece containing the PTC coating; the battery using the pole piece has good safety characteristics against overcharge, short circuit, squeezing, needling and the like.

A micromachined thermal and mechanical isolator for MEMS die that may include two layers, a first layer with an active temperature regulator comprising a built-in heater and temperature sensor and a second layer having mechanical isolation beams supporting the die. The isolator may be inserted between a MEMS die of a disc resonator gyroscope (DRG) chip and the leadless chip carrier (LCC) package to isolate the die from stress and temperature gradients. Thermal and mechanical stress to the DRG can be significantly reduced in addition to mitigating temperature sensitivity of the DRG chip. The small form can drastically reduce cost and power consumption of the MEMS inertial sensor and enable new applications such as smart munitions, compact and integrated space navigation solutions, with significant potential cost savings over the existing inertial systems.

The present invention relates to an organic-inorganic composite high-molecular microsphere with multiple response property and its preparation method. Said method includes the following steps: using alkyl metasilicate as precursor, utilizing gel-sol process to prepare magnetic nano granules covered with silicon dioxide, and using silicane coupling agent to make surface modification, then adopting template polymerization process, using the above-mentioned magnetic nano granules as seed and using isopropyl acrylamide or its derivative as main monomer, and using acrylic acid or its salt as functional monomer and controlling the dose of main monomer, functional monomer and crosslinking agent to prepare the organic-inorganic composite high-molecular microsphere with different swelling ratios.

A head gimbal assembly includes a slider and novel gimbal that may reduce crown sensitivity to temperature without substantially sacrificing the ability of a bond between the gimbal tongue and slider to resist applied forces and torques. The gimbal has a tongue that includes at least one weakening region. The weakening region extends more in a direction perpendicular to the length of the slider than it does in a direction parallel to the length of the slider. A bonding surface of the slider is attached to the tongue in a first bonding region that extends closer to a leading end of the slider than the weakening region does, and in a second bonding region that extends closer to a trailing end of the slider than the weakening region does. The gimbal can be used in a head gimbal assembly of a magnetic hard disk drive or other information storage device.

The invention relates to a method for making a chitosan derivative. The method is characterized in that: firstly, the purified chitosan is activated by a strong base to form a hydroxyl-K type chitosan; secondly, a 1, 2-butyl oxide linkage is taken as an etherifying agent, an isopropanol is taken as a disperse phase, the reaction lasts 2 to 4 days moderately at room temperature; after the reaction is finished, 8 to 10 times volume of acetone is precipitated and washed to be neutral as well as is dried in vacuum at a temperature of 50 DEG C to obtain the white powder. The hydroxybutyl chitosan with different degrees of substitution is obtained by controlling the proportion of the chitosan and the 1, 2-butyl oxide linkage and the reaction time. The method has the advantages of good water-solubility and the existence of the temperature sensitivity at a physiological temperature.

The invention discloses a packaging method for a sensitivity enhanced optical fiber grating temperature sensor, belongs to the technical field of sensors, and relates to a sensitivity enhanced packaging method of the optical fiber grating temperature sensor. The method is characterized in that the optical fiber grating is packaged into a metal capillary tube by applying prestress to the optical fiber grating and gluing two ends of the optical fiber grating, and the metal capillary tube packaged with the optical fiber grating is put into an outer stainless steel tube the internal diameter of which is greater than the external diameter of the metal capillary tube, then heat conducting silicone grease is filled between the metal capillary tube and the outer stainless steel tube, and finally the two ends of the outer stainless steel tube are connected with an optical fiber jacket or an optical fiber cable; and a fiber pigtail of the optical fiber grating must be ensured to be in a bent state during the packaging process. The beneficial effects of the packaging method is that the sensitivity enhanced optical fiber grating temperature manufactured by the packaging method has the advantages of high temperature sensitivity, rapid response speed, simple structure, reasonable design, high survival rate of the field installation and the like, and can be used for high-precision temperature measurement in such occasions as intense electromagnetic radiation, flammable and explosive occasions and the like.

The invention discloses a carbon quantum dot-poly N-isopropylacrylamide composite material and a preparation method thereof. An N-isopropylacrylamide polymer is grafted to the surface of carbon quantum dots obtained by microwave treatment by adopting an atom transfer radical polymerization (ATPR) method. The preparation method is simple, convenient and mild in conditions. Modified carbon nano particles have fluorescence property and temperature sensitivity.

A bolometer having decreased noise and increased temperature sensitivity and a method of manufacturing the same are provided. The bolometer has a resistive layer formed of single crystalline silicon (Si) or silicon germanium (Si_1-xGe_x, x=0.2˜0.5) having high crystallinity, such that 1/f noise can be reduced and temperature sensitivity can be significantly improved compared to a conventional amorphous silicon bolometer.

The invention relates to a porous temperature-sensitive hydrogel slow release formulation and a preparation method thereof. The preparation method comprises the steps of taking poly(N-isopropylacrylamide) porous temperature-sensitive hydrogel as a carrier, loading drugs in the hydrogel, thereby realizing controlled release of the drug by utilizing the temperature sensitivity characteristic of the poly(N-isopropylacrylamide). When the temperature is lower than the LCST (Lower Critical Solution Temperature) of the hydrogel, the drug release is slow, and when the temperature is higher than the LCST, the release speed is accelerated. The preparation method can be used for preparing temperature-sensitive sustained-release pesticide and insecticide, the drug use frequency can be reduced by utilizing the temperature-sensitive sustained-release property, and the effects of improving the pesticide effect and reducing the toxicity can be achieved. The porous temperature-sensitive hydrogel sustained-release inhibitor is fast to react, and simple in technique, has good temperature-sensitive characteristic and sustained-release property, is convenient to use, safe and efficient, thereby having wide application prospects.

Apparatus and methods for regulating gate delays of synchronous and asynchronous digital circuits. Thermally-sensitive circuits include, generally, temperature sensitive voltage sources outputting a voltage signal indicative of the temperature of the digital circuit, where the voltage signal reflects non-linear temperature sensitivity above a predetermined threshold temperature, and delay mechanisms receiving said temperature sensitive voltage signal(s) as input and being configured to automatically continuously modulate the speed of signal propagation through the circuit in response to said voltage signal, thereby causing circuit elements within the circuits to switch less frequently and consequently causing the circuit elements to generate less heat with increasing circuit temperature.

The present invention relates to one kind of environment responding aquogel copolymer and its preparation process. The aquogel consists of: N-isopropyl acrylamide 10-90 wt% and methacrylate dextran derivative 10-90 wt%. The preparation process of the environment responding aquogel copolymer includes chemical modification of dextran with GMA to synthesize methacrylate dextran derivative, MA-Dex, with reaction activity; and subsequent copolymerization of MA-Dex and NIPA to obtain the said environment responding aquogel copolymer P(NIPA-co-MA-Dex). The aquogel copolymer has high temperature sensitivity and quick responding speed as well as high strength and excellent biocompatibility. The preparation process is simple, needs no special apparatus and is easy to realize in industry.

At least one forward-biased semiconductor diode having a potential barrier is used as a temperature sensor whose sensitivity can be finely adjusted. An operational amplifier circuit (A1) is used to apply a bias voltage of DC or rectangular waveform to a semiconductor diode (D) having a potential barrier used as a temperature sensor. In view of the fact that the temperature sensitivity of the semiconductor diode (D) depends on the height of its potential barrier, the forward bias voltage applied from a bias circuit (2) directly to the semiconductor diode (D) is finely adjusted to obtain desired temperature sensitivity. The output voltage of the sensor is associated with a current, having an exponential temperature dependence, which flows in the semiconductor diode (D) with the forward bias being fixed.

A laser amplification system is disclosed that enables reliable operation over large ambient temperature operating window, as well as a significant reduction of laser temperature sensitivity typically associated with diode pumped lasers. The techniques employed by the system effectively eliminate damaging gain hot spots and lower ASE and ESA thresholds, thereby increasing laser peak and average power levels. Additionally, the techniques allow for thermal programming of active gain medium material to minimize thermally induced aberrations. In one particular example embodiment, a variable dopant concentration multi-pass laser amplifier is provided having a customized active ion concentration profile, tailoring the combination of laser absorption and gain distribution using a ceramic YAG host.

Disclosed is a block copolymer formed by coupling the following components with each other: (a) a copolymer (A) of a polyethylene glycol (PEG) type compound with a biodegradable polymer; and (b) at least one oligomer (B) selected from the group consisting of poly(β-amino ester) and poly(amido amine). A method for preparing the same block copolymer, and a polymeric hydrogel type drug composition comprising the temperature and pH-sensitive block copolymer and a physiologically active substance that can be encapsulated with the block copolymer are also disclosed. The multiblock copolymer is obtained by copolymerization of a pH-sensitive poly(β-amino ester) and/or poly(amido amine) type oligomer, a hydrophilic and temperature-sensitive polyethylene glycol type compound and a hydrophobic and biodegradable polymer. Therefore, the block copolymer can form a polymeric hydrogel structure due to its amphiphilicity resulting from the combination of a hydrophilic group and a hydrophobic group in the copolymer and ionization characteristics depending on pH variations, and thus can be used as a drug carrier for target-directed drug delivery depending on pH variations in the body.

Ablation is carried out by bringing a probe into contact with a target tissue. The probe has a plurality of temperature sensors and an ablation electrode on its distal portion. The temperature sensors are distributed circumferentially about the longitudinal axis such that the probe has an omnidirectional temperature sensitivity. After verifying that contact exists between the probe and the target tissue, and while applying energy through the ablation electrode data from the temperature sensors is repetitively recorded. Thereafter, responsively to detection of a drop in temperature with respect to the baseline temperature level, it is concluded that a loss of contact between the probe and the target tissue has occurred. The operator is thereupon alerted.

An epitaxially grown semiconductor heterostructure has an inner region (5) which is substantially laterally confined by confinement regions (9) and has enhanced transverse confinement by enhanced transverse confinement layers (3, 7). The latter layers are not exposed outside the growth chamber during processing, by stopping the etching for producing the lateral confinement, above the lower enhanced transverse confinement layer (3) and growing such an upper layer (7) after making the lateral confinement regions (9). The structure is intended to be used in particular having the inner region act as an active laser region, for instance in InP-based 1.3 mu m wavelength lasers. Then the simultaneous lateral confinement, enhanced transverse confinement and exposure protection enables simultaneously a low threshold current, a small temperature sensitivity and reliable, long life operation. The enhanced transverse confinement layers (3, 7) could comprise aluminium protected from oxidation during processing. Such a laser will then be protected from a declined reliability.

A light source sequentially emits lights generated by at least three light emitting elements each emitting a different primary color to generate an image. Each light emitting element has a duty cycle in a lighting period, which may be an image frame period. A sequence scheme is provided for alternatingly driving different ones of the light emitting elements. The light emitting elements are driven in accordance with the sequence scheme at least two times in the lighting period, while maintaining the duty cycle for each light emitting element. In the sequence scheme, at least one light emitting element having the highest temperature sensitivity of all light emitting elements is driven more times than another one.

The invention discloses a crystallization controllable thermoplastic polyurethane material and a preparation method of the crystallization controllable thermoplastic polyurethane material. The thermoplastic polyurethane material comprises and is prepared from the following components: 1) a diisocyanate compound; 2) a hydroxyl and/or amido end capped macromolecular compound; 3) a diamine or diol cyclodextrin derivative; 4) a chain extender. The types and the use amounts of a main chain extender and an auxiliary chain extender in the chain extender are controlled, meanwhile, the cyclodextrin derivative is introduced, so that the crystallization characteristic of the thermoplastic polyurethane material is controlled, the controllable degree of crystallinity and the improved viscosity temperature sensitivity are obtained, and the shrinkage percentage of the material is also changed correspondingly. The obtained thermoplastic polyurethane material can be used in a rapid forming method in the fusing processing, like a fused deposition rapid forming method or a selective laser sintering method.

The invention discloses a preparation method of a double-emission carbon-based nano probe prepared based on an electrostatic interaction induced self-assembling method and application of a product ofthe preparation method to in-vivo and in-vitro temperature detection of organisms, and belongs to the technical field of colorimetric fluorescence detection. The preparation method comprises synthesisof blue fluorescence carbon dots (B-CDs) which have no temperature sensitivity and negative charges on surfaces, preparation of red fluorescence carbon dots (R-CDs) which have temperature sensitivityand positive charges on surfaces and preparation of the double-emission carbon-based nano probe. According to the double-emission carbon-based nano probe obtained by the preparation method, the double-emission carbon-based nano probe has different responsiveness aiming at different temperature and has different compound temperature color changes; the double-fluorescence emission nano probe can beused for colorimetrically detecting in-vivo and in-vitro temperature of the organisms by naked eyes, and has high sensitivity (0.93 percent/DEG C) and operation repeatability, so that the double-fluorescence emission nano probe provides convenience for biological imaging, temperature sensing, environment monitoring, food safety and the like.

The invention discloses a system for testing ultrasonic dynamic burning rate of a solid propellant, comprising a burning chamber, a gas distribution unit and a testing and controlling unit, wherein an ultrasonic transmitting and receiving unit is arranged at the top or bottom of the burning chamber; the ultrasonic transmitting and receiving unit is composed of an ultrasonic probe and a coupling medium; the coupling medium is a cylinder; two end surfaces of the coupling medium are respectively closely contacted with a working surface of the ultrasonic probe and a sample of the solid propellant; and the testing and controlling unit is used for controlling initial temperature and pressure of the burning chamber, detecting temperature and pressure of the burning chamber, and real-time burning parameters of the solid propellant, controlling the ultrasonic waves of the ultrasonic probe for transmitting fixed frequencies, receiving echoes from a burning surface of the solid propellant, and collecting and processing data. The system can test parameters such as static burning rate, dynamic burning rate, burning rate pressure indexes, burning rate temperature sensitivity coefficients and the like; and the testing efficiency of the system is dozens of times than that of a static testing apparatus.