56 results about "Differential heat" patented technology

A bi-layer, woven geotextile fabric has interwoven first and second layers. The first layer is over and under woven through the second layer in a pre-determined pattern so that the first layer has portions which face a first side of the second layer and portions which face a second side of the second layer. Monofilaments in the warp direction of the first layer have a pre-determined differential heat shrinkage characteristic that is greater than the monofilaments in the warp direction of the second layer. Closed cells defined by the pattern of the over and under weave are disposed on the first and second sides of the second layer. Shrinkage of the monofilaments in the warp direction of the first layer provide for a separation of a portion of the second layer from the first layer at the cells.

An apparatus and method for the monitoring and measurement of chemical and/or biological deposition in heat exchangers and other fluid processing vessels. The new and original sensing system includes at least two hollow fluid vessels conductively mounted across a constant heat transfer path. Thin film heat flux sensors are attached to a heat transfer surface of the vessels in order to measure changes in differential heat flux that occur when deposition begins to accumulate in the vessel. In this way, it is shown that differential heat flux measurements can be used to detect and measure the early onset of chemical and/or biological deposition.

A method and apparatus for underfilling a gap between a multi-sided die and a substrate with an encapsulant material. The die and/or the substrate is heated non-uniformly by a heat source to generate a temperature gradient therein. The heated one of the die and the substrate transfers heat energy in proportion to the temperature gradient to the encapsulant material moving in the gap. The differential heat transfer steers, guides or otherwise directs the movement of the encapsulant material in the gap. The temperature gradient may be established with heat transferred from the heat source to the die and/or the substrate by conduction, convection, or radiation. The temperature gradient may be dynamically varied as the encapsulant material moves into the gap.

There is provided a differential scanning calorimeter possessing an accommodation chamber accommodating a sample to be measured and a reference material, a heater heating the accommodation chamber, a differential heat flow detector outputting a temperature difference between the sample to be measured and the reference material as a heat flow difference signal, a cooling block cooling-controlled to a predetermined temperature, a heat resistor which mechanically connects the cooling block and the accommodation chamber and forms a heat flow path between both, a first fixation means which fixes the heat resistor to the cooling block by pressing the former while being biased by a constant elastic force, and a second fixation means which fixes the accommodation chamber to the heat resistor by pressing the former while being biased by a constant elastic force.

A method and system for determining the quality and configuration of a structure that is constructed from a thermoformable material, such as a thermoplastic or thermoset material, and in particular thermoplastic composite tapes, where heat is applied to cure the thermoformable material. The quality of the build is monitored during the construction of the structure by determining the differential heat flux in the material as it cools from its elevated temperature. The system and method also may determine the location of defects in a structure being constructed so that remedial measures may be taken or production operations halted to address the defect. A transient thermal effect is applied to the structure being monitored, such as the thermoformable material being applied, which may be implemented from the applied heating of the thermoformable construction application process or additional heating.

A toner includes at least a crystalline compound, a binding resin and coloring agent, wherein a differential heat quantity curve measured by a differential scanning calorimeter (DSC) has a clear endothermic peak at 50 to 100° C. in a first temperature rising process, and in a second temperature rising process, a peak area of the endothermic peak is reduced by ⅓ or less with respect to the peak area of the endothermic peak in the first temperature rising process. An image forming method employs the toner.

A differential scanning calorimeter apparatus includes reference and sample cells and controlled temperature shields. The temperature of the shields is controlled such that baseline curvature is reduced by eliminating heat flow from the furnaces to their surroundings (quasi adiabatic conditions) and by controlling heat flow through a well defined solid state heat resistance between the furnaces and a temperature controlled heat sink. The temperature of each shield can be controlled independently to reduce differential heat flow over the whole temperature range of the scan, or maintained at a constant temperature for conventional power compensated DSC operation. The temperature/time profile for each shield can be controlled according to actual furnace temperature, obtained from an empty run, or stored in the computer memory and recalled for sample measurements.

The invention relates to a flow distributor, which comprises a valve body, a sliding valve core and an adjusting component, wherein one end face of the valve body is provided with a medium inlet, the side wall of the valve body is provided with two external outlets, the side wall of the sliding valve core is provided with two internal outlets, the adjusting component is a temperature-length memory spring positioned in an inner cavity of the valve body, the sliding valve core can be attached to the inner cavity of the valve body and moved under the control of the memory spring, the two external outlets and the two internal outlets are parallelograms which have the same section shape and the same sectional area, the first external outlet can be completely coincided with the first internal outlet, and the second external outlet can be completely coincided with the second internal outlet. The flow distributor is not supplied by power, can be used singly, and can form a passive element together with other components.

The invention pertains to the technical field of thermal analysis and test, in particular to a Peltire low-temperature micro thermal analyzer, which comprises sensors, crystallizer, a hot pump chip, a sealer, a temperature/heat flow measuring device, a temperature/heat flow measuring and power controller, an A/D converter, and a digital processor, etc. The sealer is hollow in the middle, the sensor, crystallizer and the chip are in the sealer, the chip is located at the bottom of the sealer, the crystallizer is above the chip; the top of the crystallizer is provided with a recess, in which a sensor is placed; at one side of the crystallizer, a sensor is provided, which is connected with a wire with the temperature/heat flow measuring and power controller, and is connected with a wire with the temperature/heat flow measuring device; another end of the temperature/heat flow measuring device is connected with the A/D converter, which is connected with a computer that is connected with a printer. The invention is of high measuring accuracy, is highly automatic, can be used for studying the nucleation principle of crystal of organic system such as DNA, protein, polymers and medicines, etc., for studying solid-liquid phase balancing and crystallizing principle, etc.

The invention provides a preparation method of ammonium persulfate delayed breaker coated with silica airgel microspheres, by using silica airgel instead of polymer material as the coating material of ammonium persulfate, It solves the defect of poor heat resistance of polymer materials, realizes the delayed release of the breaker, improves the stability and safety of the ammonium persulfate breaker in fracturing construction, prolongs the operation time, and ensures The crack construction can be carried out safely and smoothly.

There is provided a differential scanning calorimeter for exactly measuring a calorie variation of the measured sample on the basis of the temperature difference between sample container and the reference container without the influence of the heat irregularity incoming from the surroundings and the noise components. The differential scanning calorimeter includes a heating furnace of an approximately H-shaped section having an approximately drum-shaped wall part and an approximately plate-shaped heat inflow part, a heater disposed outside the wall part so as to heat the heating furnace, a approximately bar-shaped heat-resistance member that is arranged along the center axis L of the wall part, that protrudes from both sides of the heat inflow part by an approximately equal length, that is made of a material heat conductivity lower than that of the material of the heating furnace, a sample container disposed at one end of the heat-resistance member, a reference container disposed at the other end of the heat-resistance member, and a differential heat flow detector measuring a difference between the temperature of the sample container and the temperature of the reference container as a measured value.

A fire heat sensor comprising a high-temperature detecting portion provided with a temperature detecting element which exhibits a fast heat response to a rise in ambient temperature, and a low-temperature detecting portion provided with a temperature detecting element which exhibits a slow heat response to a rise in ambient temperature. The fire heat sensor further comprises a resin member by which the high-temperature detecting portion and the low-temperature detecting portion are integrally formed so that heat energy is transferred from the temperature detecting element of the high-temperature detecting portion to the temperature detecting element of the low-temperature detecting portion. In the fire heat sensor, differential heat sensing is performed based on temperatures detected by the low-temperature detecting portion and the high-temperature detecting portion.

The invention discloses a method for predicting residual life of in-service gas polyethylene pipelines, and belongs to the technical field of polyethylene pipeline life prediction. According to the method, an accelerated ageing experiment is carried out on a polyethylene pipeline having the same mark with an in-service polyethylene pipeline to prepare an aged polyethylene pipeline according to method requirements, and the ageing time, the temperature and the pressure are recorded; and a differential heat scanning method is used for testing an oxidation induction period of the aged polyethylenepipeline, and an oxidation induction period data set is recorded to obtain a residual life prediction formula (as shown in the specification); and finally, a few smalls are scraped from the surface of the in-service polyethylene pipeline to carry out a differential heat scanning method test, and an obtained oxidation induction period numerical value is substituted into the a0 of the residual lifeprediction formula to carry out calculation so as to predict the residual life of the gas polyethylene pipeline under operation state. The life prediction method does not influence the normal operation of urban gas polyethylene pipelines, is simple and time-saving, has a certain data distinguishing ability and is capable of providing technical support for the safe operation of in-service gas polyethylene pipelines.

Provided is a process for producing a regenerated hydrotreating catalyst by regenerating a spent hydrotreating catalyst in a prescribed temperature range, wherein the prescribed temperature range is a temperature range of T₁−30° C. or more and T₂+30° C. or less, as determined by subjecting the spent hydrotreating catalyst to a differential thermal analysis, converting a differential heat in a measuring temperature range of 100° C. or more and 600° C. or less to a difference in electromotive force, differentiating the converted value twice by temperature to provide a smallest extreme value and a second smallest extreme value, and representing a temperature corresponding to the extreme value on the lower-temperature side as T₁ and a temperature corresponding to the extreme value on the higher-temperature side as T₂.

The invention provides a differential thermal forming method for preparing a high-strength and high-toughness magnesium alloy. The differential thermal forming method aims at only heating a forming die at the deformation temperature without heating an alloy sample. After heat preservation is conducted for a determined time, an alloy blank at the room temperature is placed in the heated forming die, and stable deformation is achieved. The differential thermal forming method comprises the steps that (1) burdening is conducted; (2) preheating is conducted, specifically, a dried magnesium ingot, tin particles, a zinc block and an Mg-Zr intermediate alloy are preheated for 30-35min at the temperature of 200-250 DEG C; (3) smelting and casting are conducted, and a cast alloy is obtained; (4) heat treatment is conducted and comprises solution treatment and aging treatment; (5) and (6) extrusion forming is conducted; and (7) and (8) differential thermal equal-channel corner extrusion forming is conducted. The forming method serves as the core, and differential thermal equal-channel corner extrusion stable forming is successfully achieved. The tensile strength of the alloy exceeds 300MPa, the ductility is close to 30%, excellent comprehensive mechanical performance is obtained, and good strength and plasticity matching is achieved.

A system and method are disclosed wherein differential heat transfer resistances are used to effectively and efficiently detect the early onset of deposit accumulation in industrial fluid processes and fluid transport vehicles.

According to one embodiment, a probe is provided in conjunction with a heat source, a water source and a probe. The probe is comprised of a heat transfer surface, a first part of which is covered only by a thin metal layer. The second or remaining portion of the heat transfer surface is covered by a heat flux sensor and a thin metal layer. The metal layers of both the first and second areas of the probe are connected, and water flows across the full heat transfer surface. Deposition forms on a portion of the heat transfer surface as a result of slow water flow and elevated water temperature. The temperatures of the heat source, water source, and heat flux are measured. The deposition rate as a rate of change of heat transfer resistance is measured.

A multi-ingot furnace for the growth of crystalline semiconductor material has one or more heating devices for heating a hot zone in which crucibles containing semiconductor material are received. At least one of the heating devices is arranged to apply a predetermined differential heat flux profile across a horizontal cross-section of the semiconductor material in one or more of the crucibles, the predetermined differential heat flux profile being selected in dependence the position of the one or more crucibles in an array. In this manner, the heating device can at least partially compensate for differences in the temperature across the semiconductor material that arises from its geometric position in the furnace. This reduces the possibility of defects such as dislocations during the growth of a crystalline semiconductor material. Associated methods are also disclosed.