Abstract:
A method and an apparatus of heat flux control for calorimetry, adiabatic shielding, precise temperature setting and the like, on an object (2). The steps are provided of arranging a shield (1) about the object (2); heating uniformly (5) the shield (1) and monitoring (3) the heating step to maintain the shield (1) at a chosen temperature; arranging about the shield a thermal bath (7) at a known temperature in any case lower than the temperature of the shield (1); measuring the temperature of the object (2); and controlling (8) the heat flux (5) between the object (2) and the shield (1) by checking the temperature (4) of the object (2) and the temperature (3) of the shield (1). The application in the field of the calorimetry allows advantages and the use of a same calorimeter both in the classic adiabatic way, and in the temperature scanning adiabatic way as well as in the modulated way.
Abstract:
Provided is a mass and heat flow measurement apparatus comprising sample and reference microresonators (70, 80), such as sample and reference quartz crystal microbalances; sample and reference heat flow sensors (75, 85), such as sample and reference isothermal heat conduction calorimeters; and sample and reference heat sinks coupled thermally to the heat flow sensors. The apparatus may be used to measure changes in mass due to sample (8) on a surface of the sample microresonator and also to measure heat flows from the sample (8) on the surface of the sample microresonator by utilizing the heat flow sensors, which are coupled thermally to the corresponding sample or reference microresonators. Also provided is a method for measuring the mass of a sample (8) and the flow of heat from the sample (8) to the heat sink by utilizing such apparatus.
Abstract:
Provided is a mass and heat flow measurement apparatus comprising sample and reference microresonators, such as sample and reference quartz crystal microbalances (70, 80), sample and reference heat flow sensors (75, 85), such as sample and reference isothermal heat conduction calorimeters; and sample and reference heat sinks coupled thermally to the heat flow sensors. The apparatus may be used to measure changes in mass due to sample (8) on a surface of the microresonator and also to measure heat flows from the sample (8) on the surface of the sample microresonator by utilizing the heat flow sensors, which are coupled thermally to the corresponding sample or reference microresonators. Also provided is a method for measuring the mass of a sample (8) and the flow of heat from the sample (8) to the heat sink by utilizing such apparatus.
Abstract:
Provided are mass and heat flow measurement sensors comprising a microresonator, such as a quartz crystal microbalance; a heat flow sensor (c), such as an isothermal heat conduction calorimeter; and a heat sink (d) coupled thermally to the heat flow sensor. The sensors may be used to measure changes in mass due to a sample (8) on a surface of the microresonator and also to measure heat flow from the sample (8) on the surface of the microresonator by utilizing the heat flow sensor, which is coupled thermally to the microresonator. Also provided are methods for measuring the mass of a sample (8) and the flow of heat from the sample (8) to the heat sink (d) by utilizing such mass and heat flow measurement sensors.
Abstract:
A Differential Scanning Calorimeter (DSC) which has constant calorimetric sensitivity over its entire range of operating temperatures from -200 DEG C to 540 DEG C. The DSC sensor consists of a pair of thin-film Resistance Temperature Detectors (RTDs) which are used to sense the temperature of a sample and the temperature difference between the sample and an inert reference. The RTDs are supplied with an excitation current which varies according to the temperature of the reference to achieve constant calorimetric sensitivity, independent of the operating temperature.
Abstract:
A differential calorimeter includes a reference cell (1), a sample cell (2), a thermal shield (9) surrounding the reference cell (1) and the sample cell (2), a heating device (3, 4) thermally coupled to the thermal shield (9), a temperature sensor (14) for monitoring a temperature of the thermal shield (9), a temperature sensor (12) for monitoring a temperature differential between the thermal shield (9) and the cells (1, 2), and a control system (6). The control system (6) has an output line connected to the heating device (3, 4), input lines to receive signals from the temperature sensors (12, 13), and is configured to generate on its output line an output signal which is a function of both the input signals received on its input lines.
Abstract:
The invention is directed to a differential analysis method and apparatus (10) wherein a sample (58) and a reference (56) are subjected to an externally applied disturbance, such as a temperature change, in accord with a prescribed function comprising the sum of a linearly changing part and a periodically changing part, and the measured differential signal is processed into real and imaginary components relating, respectively, to the energy storage and energy loss portions of the signal.
Abstract:
Embodiments of this invention relate to a composition composed of at least (A) a propylene-based polymer, and (B) a filler dispersed within the propylene-based polymer, which can be used as a wear layer on a resilient flooring or other substrate, among other uses.
Abstract:
The present invention provides a process for the preparation of Teriflunomide (Formula-I). The present invention describes the synthesis of Teriflunomide without isolating the intermediate Leflunomide. Teriflunomide is prepared from 5-Methyl isoxazole-4-carboxylic acid by converting to its acid chloride and coupling with 4-trifluoromethyl aniline to obtain Leflunomide (which is not isolated) followed by ring opening reaction using aq. Sodium Hydroxide to form Teriflunomide. In other words, the process is telescoped from 5- methylisoxazole-4-carbonyl chloride.