Abstract: A method for evaluating a measurement result of a thermal analysis. A program-controlled computer unit is used to calculate at least one probability of the agreement of the measurement result with at least one dataset previously stored in the computer unit, wherein this calculation is based on a comparison of effect data previously extracted from a measurement curve of the thermal analysis with corresponding stored effect data of the dataset. The evaluation can advantageously include, an automatic recognition and classification of measurement curves and can be carried out in particular more efficiently, more economically and more quickly than previously, with at the same time a high quality of evaluation.

Abstract: A temperature indicating method, a temperature indicating label used by this method, and a method for manufacturing the temperature indicating label, includes: a, determining the target temperature, adopting the thermal induced shape memory polymer material to manufacture the temperature indicating label; b, heating the temperature indicating label to make it achieve or exceed the initial temperature of glass transition or melting transition but be lower than the terminal temperature of glass transition or melting transition, then finishing the predeformation treatment; and c, placing the predeformed temperature indicating label into the environment which needs temperature indication for a while, observing whether spontaneous shape recovery happens to the label and judging whether the environment temperature has once reached or exceeded the target temperature.

Abstract: Some embodiments include apparatuses and methods having a node to receive ground potential, a first diode including an anode coupled to the node, a second diode including an anode coupled to the node, a first circuit to apply a voltage to a cathode of each of the first and second diodes to cause the first and second diodes to be in a forward-bias condition, and a second circuit to generate a signal having a duty cycle based on a first voltage across the first diode and a second voltage across the second diode. At least one of such the embodiments includes a temperature calculator to calculate a value of temperature based at least in part on the duty cycle of the signal.

Abstract: Systems and methods for sensing temperature on a chip are described herein. In one embodiment, a temperature sensor comprises a first transistor having a gate, a second transistor having a gate coupled to the gate of the first transistor, and a bias circuit configured to bias the gates of the first and second transistors such that the first and second transistors operate in a sub-threshold region, and to generate a current proportional to a difference between a gate-to-source voltage of the first transistor and a gate-to-source voltage of the second transistor. The temperature sensor also comprises an analog-to-digital converter (ADC) configured to convert the current into a digital temperature reading.

Abstract: A system is disclosed for measuring a temperature of air within a container or other enclosure containing temperature controlled items or other product. The system includes a temperature sensor having a thermocouple within a shaft, and a fan for drawing air from within the container through the shaft and past a junction of the thermocouple. The temperature sensor further includes a control unit for correlating a voltage from the thermocouple to a temperature.

Abstract: A power generation device includes a thermoelectric conversion part; a cooling member configured to be disposed on one principal surface of the thermoelectric conversion part; and a heat generation part configured to be disposed on another principal surface of the thermoelectric conversion part, to be formed of a viscoelastic body having a plurality of cavities formed in the viscoelastic body, and to generate heat by violation.

Abstract: The invention relates to a method of measuring the temperature of a coiled component comprising the injection of a known DC current into a gauge wire (1) made of resistive material, the resistance of the gauge wire varying with temperature according to a known law, the measurement of potential difference between the terminals (7a, 7b) of said gauge wire, and a step of calculation transforming the potential difference into a mean temperature of the gauge wire, said gauge wire (1) being wound inside the coil, and arranged as a series of “outbound” turns (5) and a series of “inbound” turns (6) associated pairwise with a geometry and a position that are substantially equal. It also relates to a component made in order to be able to implement this method and the measurement device as a whole.

Abstract: A system for protection from fires and electrical shock of components used in construction of electrical systems is disclosed using a sensing degree of characteristic before an arc fault, with the purpose to detect, annunciate, and remove the hazard before an electrical arc occurs.

Abstract: A temperature measurement system includes an optical fiber, a temperature distribution measurement apparatus, and a data processing apparatus. The temperature distribution measurement apparatus is configured to detect backscattered light by causing light to enter the optical fiber, and acquire the temperature distribution of the optical fiber in the length direction thereof based on the result of the detection. The data processing apparatus is configured to store therein the temperature distribution acquired by the temperature distribution measurement apparatus, perform signal processing on a difference temperature distribution obtained by computing the difference between a current temperature distribution and a past temperature distribution, and determine whether or not abnormality is present based on the result of the signal processing.

Abstract: The invention relates to a temperature sensor (1) for a motor vehicle comprising:—a housing (3) defining an internal volume comprising a temperature sensitive element (5),—electrical wires (9) linked electrically to said temperature sensitive element (5) and configured to transmit an item of temperature information from said sensitive element (5) to the exterior of the housing (3),—a seal (13) partially surrounding the said electrical wires (9) so as to isolate the sensitive element (5) with respect to the exterior of the housing (3), the seal (13) extending preferably in a direction, termed the longitudinal direction.

Abstract: A component of a machine. The component has a measuring fixture for measuring forces and at least one metallic, magnetic portion. The measuring fixture includes at least one field-generating member for producing an electromagnetic alternating field and at least one detection member for detecting changes of the magnetic field produced. The field-generating member and the detection members are arranged on the metallic, magnetic portion and are designed to interact with the metallic, magnetic portion in such manner that by way of the measuring fixture, as a function of measurement signals from the detection member, forces acting on and/or deformations of the component can be detected.

Abstract: A transducer structure including a carrier with an opening and a suspended structure mounted on the carrier which extends at least partially over the opening in the carrier is disclosed. The transducer structure may further include configuring the suspended structure to provide an electrostatic field between the suspended structure and the carrier by changing a distance between the suspended structure and the carrier. Alternatively, the suspended structure may be configured to change the distance between the suspended structure and the carrier in response to an electrostatic force provided between the suspended structure and the carrier.

Abstract: The invention provides a piezoresistive electronic skin, a preparation method and a use thereof. The piezoresistive electronic skin uses carbon nanotube film as the conductive layer and uses materials provided with micro-nano patterns, such as polydimethylsiloxane, polyethylene terephthalate, polyvinyl alcohol, polyvinyl formal, polyethylene, and so on, as the substrate, enabling the substrate has advantages of high flexibility and being pliable, and it needs low operating voltage and little power consumption, but has high sensitivity and short response time. More importantly, the invention uses the patterned flexible substrate as the basis, greatly improving the sensitivity of electronic skin reacting to tiny applied force from outside. The invention also provides a capacitive electronic skin and a preparation method thereof. Further, the invention also provides a use of the piezoresistive electronic skin or the capacitive electronic skin on speech recognition, pulse detection, medical robot, etc.

Abstract: A current source circuit flowing an output current to at least one detection element including a first terminal to which a first voltage is supplied and a second terminal being connected to the current source circuit includes a reference resistance, a current mirror circuit including at least one first transistor and at least one second transistor, and a control circuit controlling a voltage of a common wire that is connected to a terminal provided at the first transistor and a terminal provided at the second transistor such that a voltage of a terminal provided at the reference resistance comes to be equal to a reference voltage.

Abstract: For measuring tensile and/or compressive loads force measuring systems are provided for measuring a tensile and/or compressive load of a structure have a first force measuring sensor assigned to the structure, and a second force measuring sensor assigned to the structure. To provide a force measuring system that enables high measuring accuracy, the first and the second force measuring sensor differ in such a way, that the first force measuring sensor is designed to measure a nominal load range, and the second force measuring sensor is designed to measure a sub-range of the nominal load range.

Abstract: An optical force sensing element for microsurgical instruments and methods measures force F in three orthogonal directions and includes a monolithic cylinder structure, a cylindrical surface and a top surface that absorbs and transmits the force F. Three punch-like notches, all being parallel to the y-direction, are spaced apart along the z-axis and form two blades between the first and second notch and between the second and the third notch. Three channels parallel to the z-axis extend from the bottom surface to the top surface and cross the first notch while bypassing the other two notches. Three optical fibers, each fixed in one of the three channels, all entering the structure from the bottom surface, cross the first notch and end at or near the top surface while being interrupted in the first notch and forming two surfaces of each fiber that define a Fabry-Perot interferometric cavity.

Abstract: A force detection apparatus includes a first member, a second member, and a third member, the second member and the first member sandwich a plurality of piezoelectric elements (in a narrow sense, a first piezoelectric element and a second piezoelectric element), and the third member and the first member sandwich a plurality of piezoelectric elements (in a narrow sense, a third piezoelectric element and a fourth piezoelectric element) different from the plurality of piezoelectric elements sandwiched by the second member and the first member.

Abstract: A method for manufacturing a pressure measuring cell, which has a ceramic platform and a ceramic measuring membrane, wherein the measuring membrane is joined with the platform pressure tightly by an active hard solder, or braze, wherein the method includes: providing the platform, the measuring membrane and the active hard solder, or braze, positioning the active hard solder, or braze, between the platform and the measuring membrane; melting the active hard solder, or braze, by irradiating the active hard solder, or braze, by a laser, wherein the irradiating of the active hard solder, or braze, occurs through the measuring membrane; and letting the active hard solder, or braze, solidify by cooling.

Abstract: A sensor for detecting a position of an effective surface of the sensor includes a first magnetic field generator, a magnetic tunnel resistor, and a second magnetic field generator. The first magnetic field generator generates a first magnetic field that is oriented in an axis of a movement direction of the effective surface. The magnetic tunnel resistor is spaced from the first magnetic field generator in the extension of the axis. The magnetic tunnel resistor has a first magnetic layer, a second magnetic layer, and a tunnel barrier. The tunnel barrier is arranged between the first layer and the second layer, and the first layer is electrically insulated from the second layer. The second magnetic field generator is configured to generate a second magnetic field that is oriented transversally to the axis. The second magnetic field generator is oriented in a fixed manner relative to the tunnel resistor.

Abstract: A sensing system that provides an isolation diaphragm through which pressure is transmitted from a process fluid to a fill fluid contained within the sensing system's body is provided. In the system, fill fluid transfers pressure to semiconductor sensors that provide signals for both the differential pressure and the static pressure, thereby allowing for signal conditioning of the differential output to compensate for the effects of static pressure. The system's body provides a cavity for fill fluid behind each of the isolation diaphragms. At least one flat plate actuation diaphragm allows controlled movement of oil as the differential pressure of the isolation diaphragm increases. Fluid volumes are managed for thermal effects, passive thermal volume change; compensation is accomplish by offsetting the large coefficient of thermal expansion (CTE) of fill fluid by providing at least one insert whose coefficient of thermal expansion is smaller than the CTE of the system body.

Abstract: A pressure sensor includes: a pressure sensor element; a metal adapter integrally attached to the pressure sensor element and defining therein a hole through which a pressure of a fluid to be measured is introduced to the pressure sensor element; a metal fitting member provided with a housing recess receiving the adapter and connectable to a connected member; and an operation member pressing a valve provided to the connected member and defining a communicating path through which a flow path, in which the pressure of the fluid to be measured is introduced, is in communication with the hole of the adapter. The adapter and the fitting member are connected to each other by plastic deformation. The operation member is a synthetic resin member including: a contact portion brought into contact with the adapter; and a pressing portion provided on a side opposite to the contact portion to press the valve.

Abstract: An object of the present invention is to provide a gas leakage checking device and a method for the same, for checking fuel-gas leakage of safety shutoff valves simply and securely by measuring a pressure in a fuel supply pipe.

Abstract: In one aspect, systems for detecting a fuel leak are described herein. In some implementations, a system for detecting a fuel leak described herein comprises a fuel-containing vessel having an exterior surface and a carbon nanotube coating layer comprising photoluminescent carbon nanotubes disposed on at least a portion of the exterior surface of the fuel-containing vessel. The system further comprises a fuel-sensitive coating layer substantially covering the carbon nanotube coating layer. The fuel-sensitive coating layer is optically opaque or substantially opaque to wavelengths of light absorbed and/or emitted by the photoluminescent carbon nanotubes.

Abstract: The subject matter disclosed herein relates to fluid leakage detection. More particularly, subject matter relates to a device for detecting fluid leakage in a fluid drain pipe attached to a power transformer device. The device comprises fluid collection compartment attached to bottom of the fluid drain pipe and a fluid level switch is positioned in the fluid collection compartment to generate alarm signal to indicate fluid leakage.

Abstract: A gas monitoring system for continuously detecting leakage of at least one gas and being operable in an extreme climate condition, the system involving a processor; at least one emergency shutdown valve responsive to a set of instructions from the processor; and a user interface in communication with the processor. The system further involves a weather-proof enclosure for housing system components. The weather-proof enclosure is adapted to operate at a temperature range of ambient temperature to a below-freezing temperature, wherein the at least one emergency shutdown valve comprises at least one latch valve.

Abstract: Test systems for simulating an environment for erosion testing. An exemplary system includes a wind tunnel having a fan unit at one end and an exhaust unit at the other, and a test fixture that secures a specimen under test in a path of the air flow created in the wind tunnel. The system also includes a water injection unit installed between the fan unit and the test fixture that emits water droplets into the air flow. A controller of the system identifies a test profile indicating conditions for a test of the specimen, and varies the speed of the air flow, the orientation of the specimen, and/or a flow rate of water out of a nozzle of the water injection unit during the test to simulate the conditions indicated in the test profile.

Abstract: A bearing arrangement having an inner race and an outer race, between which rolling elements are disposed, the rolling elements being accommodated in a bearing cage. At least one rolling element is designed as a sensor rolling element, and the bearing cage is designed as a pin cage having multiple pin elements that at least partially accommodate the rolling elements and the at least one sensor rolling element, and a sensor rolling element for a bearing arrangement of this kind are disclosed.

Abstract: A monitoring system for an aircraft engine includes a plurality of wireless engine sensors that sense engine parameters based on an engine sampling algorithm. The wireless engine sensors receive a new engine sampling algorithm to change the engine parameter sensing and generate engine data based on the new engine sampling algorithm. An engine monitoring module is mounted at the aircraft engine and collects and stores in a memory the engine data and transmits the engine data over a wireless communications signal into the aircraft and receives a new engine sampling algorithm and transmits it to the wireless engine sensors. A wireless LAN is within the aircraft and receives the new engine sampling algorithm from a ground based control center and transmits the new engine sampling algorithm to the engine monitoring module.

Abstract: A testing fixture for a vehicle includes a tube and a piston slideably disposed in the tube. A seat belt D-ring is mounted t the piston. An actuator is supported on the tube in communication with the piston through the tube for moving the piston relative to the tube to an extended position in a designated time interval during a simulated vehicle rollover. The piston defines teeth, and a ratchet is supported on the tube and engages the teeth of the piston for preventing movement of the piston relative to the tube toward the retracted position during or after the simulated vehicle rollover.

Abstract: The present invention relates to communication system for tyre service machine being configured for receiving tyre and/or rim of vehicle wheel rotatably about rotation axis, the communication system comprising at least one processing unit and at least one measuring unit, at least one measuring unit comprising at least one sensor component for measuring at least one property of wheel, processing component for processing data acquired by at least one sensor component and/or for processing input data received from at least one of at least one processing unit, at least one processing unit and at least one measuring unit each comprising data communication component for receiving data from and/or transmitting data to another data communication component. The data communication component of processing unit and data communication components of at least one measuring unit are arranged for communicating wirelessly with each other in accordance with at least one sensor-independent protocol.

Abstract: A device for measuring equipment performance having one or more sensors that measure functionality of equipment without interactive communication between the sensors and equipment. The one or more sensors generate and transmit data related to functionality of the equipment to a microprocessor. The microprocessor contains an algorithm that converts the data related to functionality of the equipment into equipment utilization metrics. These equipment utilization metrics are transmitted by a transmitter to an equipment operator.

Abstract: The invention relates to a liquid sample preparation device such as a disposable, collapsible, flexible polymeric bag containing an adsorptive curtain of a functionalized shaped polymeric fiber bed for the direct capture of biomolecules from liquid samples. The functionalized shaped polymeric fiber bed includes fibrillated, ridged or winged-shaped fiber structures that significantly increases the surface area of the fiber resulting in enhanced separation, retention and/or purification of liquid samples containing biomolecules of interest as the liquid samples contact the adsorptive curtain of functionalized shaped fibers. Liquid samples include unclarified liquid feeds or other liquids containing one or more biomolecules of interest, including, but not limited to vaccines, recombinant proteins, cells, stem cells, monoclonal antibodies (mAbs), proteins, antibody, peptides, oligopeptides, nucleic acids, oligonucleotides, RNA, DNA, oligosaccharides and polysaccharides.

Abstract: A chemical sensing system includes a substrate material, a detector capable of indicating a presence of a target compound, gas, or vapor, and a heater for rapidly releasing compounds, gases and vapors from the substrate material. The substrate material acts to concentrate the compounds, gases, and vapors from a sample area for improved detection by the detector.

Abstract: Disclosed is a filtration device for liquid samples as well as a close and push-through device for said filtration device.

Abstract: An analyzing method of a spot welded portion, includes: acquiring bar elements as the spot welded portion; extracting other bar elements existing at a periphery of a target bar element which is targeted among the acquired bar elements; determining whether or not there is a bar element which shares the same end point with the target bar element among the extracted bar elements; determining that the target bar element and the bar element which shares the same end point with the target bar element are a three-layer spot welded portion when it is determined that there is the bar element which shares the same end point with the target bar element; and determining whether or not there is a bar element whose distance between elements with the target bar element is within a predetermined distance among the extracted bar elements when it is determined that there is not the bar element which shares the same end point with the target bar element, and determining that the target bar element and the extracted bar element

Abstract: Process for analyzing a fracture or crack surface of a TiAl turbomachine part, comprising at least one of the steps consisting in: a) marking on the surface the position and the orientation of cleavage facets, so as to identify a region of fracture or crack initiation and to determine the direction of propagation of this fracture or crack, b) examining the surface and detecting the regions with the presence of equiaxed grains and/or lamellar grains, so as to evaluate the temperature at which the fracture or crack has taken place, and c) comparing the heat tintings of the surface with those of samples from a heat tinting color chart so as to evaluate the speed of propagation of the fracture or crack.

Abstract: A method includes, using at least one processing device, obtaining position measurements and/or tilt angle measurements associated with a tissue web and identifying a stretch measurement associated with the tissue web using the obtained measurements. Identifying the stretch measurement could include using one or more mathematical formulas to calculate the stretch measurement associated with the tissue web using the obtained measurements. The one or more mathematical formulas could be defined using laboratory stretch values of multiple training webs. Different mathematical formulas can be associated with training webs having different characteristics, and the method may further include selecting at least one of the mathematical formulas based on one or more characteristics of the tissue web.

Abstract: A sample is analyzed by temperature-modulated thermogravimetric analysis (TMTGA), using a thermogravimetric analysis (TGA) instrument. The TGA instrument comprises a furnace arranged in a furnace housing and an electronic balance with a load receiver arranged in a balance housing, wherein the load receiver extends into the furnace housing. A measuring position is arranged at one end of the load receiver within the furnace housing. A control unit controls the balance and/or the furnace. The TMTGA method includes at least using the TGA instrument to subject the sample to a temperature program that varies the temperature of the furnace and provides temperature-time setpoints for controlling the sample temperature, measuring the mass change of the sample as a function of time, and determining at least one kinetic parameter of the sample based on mass change. The temperature program may be stochastic and/or event-controlled in nature.

Abstract: A liquid density measuring device for use with a hydrometer comprising a vessel for receiving a liquid sample with a temperature calibration gauge having a thermo sensing end in contact with the liquid sample within the vessel. The gauge including a readout can be either analog or digital. The readout indicates a number relative to a current temperature of the liquid sample as sensed by the gauge. The number indicated on the readout being a desired hydrometer reading at the current temperature of the liquid sample. The readout will change to indicate a different desired hydrometer reading if the liquid sample changes temperature.

Abstract: A contact angle measurement apparatus includes a liquid reservoir arrangement, a drop dosing device in fluid communication with the liquid reservoir arrangement and adapted for applying a liquid drop onto a sample surface, an illuminating device for illuminating each drop applied by the drop dosing device and disposed on the surface from a first side, and an image recording device for recording an image of each applied drop disposed on the surface. A liquid pressurizing system is adapted to pressurize liquid from the liquid reservoir arrangement, and a controller connected to the valve of each drop dosing device and to the liquid pressurizing system, which controls the operation of the liquid pressurizing system and, for each drop dosing device, opening and closing of the respective valve to apply a drop of the respective liquid from the respective liquid line to the surface in a jet of pressurized liquid.

Abstract: An inverted microwell provides rapid and efficient microanalysis system and method for screening of biological particles, particularly functional analysis of cells on a single cell basis. The use of an inverted open microwell system permits identification of particles, cells, and biomolecules that may be combined to produce a desired functional effect also functional screening of secreted antibody therapeutic activity as well as the potential to recover cells and fluid, and optionally expand cells, such as antibody secreting cells, within the same microwell.

Abstract: High numerical aperture collection optics for particle analyzers may include an ellipsoidal reflector or an ellipsoidal reflector in combination with a spherical reflector, and may efficiently collect light scattered or emitted by particles in a sample stream and then couple that collected light into a lower numerical aperture portion of the instrument's optical detection system, such as into an optical fiber for example. The reflectors may be integrated with a flow cell through which the sample stream passes, or may be separate components arranged around a flow cell or, in instruments not employing a flow cell, arranged around a sample stream in air. Refractive beam steering optics may allow multiple closely spaced excitation beams to be directed into the sample stream at low angles of incidence. The collection optics and refractive beam steering optics may be employed separately or in combination with each other.

Abstract: A method for evaluating a biological material for unassociated virus-size particles having a particular epitope indicative of an adeno-associated virus viral type or an adenovirus viral type uses a fluorescent antibody stain specific for binding with the epitope and a fluid sample with the virus-size particles and fluorescent antibody stain is subjected to flow cytometry with identification of fluorescent emission detection events indicative of passage through a flow cell of a flow cytometer of unassociated labeled particles of virus size including such a virus-size particle and fluorescent antibody stain.

Abstract: A microparticle measuring apparatus for highly accurately detecting the position of a microparticle flowing through a flow channel includes a light irradiation unit for irradiating a microparticle flowing through a flow channel with light, and a scattered light detection unit for detecting scattered light from the microparticle, including an objective lens for collecting light from the microparticle, a light splitting element for dividing the scattered light from the light collected by the objective lens, into first and second scattered light, a first scattered light detector for receiving an S-polarized light component, and an astigmatic element disposed between the light splitting element and the first scattered light detector, and making the first scattered light astigmatic. A relationship between a length L from a rear principal point of the objective lens to a front principal point of the astigmatic element, and a focal length f of the astigmatic element satisfies the following formula I. 1.5f?L?2.

Abstract: The invention relates to a flow cell for absorption detection, in which a tube through which flow is to pass is held at its opposite ends in a supporting flange in each case and is suspended in a substantially cantilevered manner, the two supporting flanges being connected rigidly to each other in order to avoid stresses accidentally introduced into the tube.

Abstract: A window for viewing combustion includes a window body having an interior surface facing a combustion space, an opposed exterior surface facing an instrument space, and a seal surface between the interior and exterior surfaces. The seal surface tapers from the interior surface to the exterior surface and hermetically separating the instrument space from the combustion space. A coupling for connecting a combustion space to an instrument space includes a union body, flanged body and locking body all aligned along an optical axis. The union body defines a tapered bore in which a viewing window for viewing combustion is disposed.

Abstract: A capillary cell is described along with an arrangement and a method for receiving, positioning and examining a microscopic specimen, in particular a cleared fluorescent specimen with the help of a single-plane fluorescence microscope. The capillary cell is suitable for being positioned in a chamber volume and contains a capillary section, which comprises a wall. The wall encloses a specimen volume and is planar and transparent in at least some sections. In addition, the capillary cell includes an upper and a lower closure section, which are connected to the capillary section and which seal the capillary section. The specimen volume is separated from the chamber volume by the capillary section, the upper closure section and the lower closure section.

Abstract: In an embodiment, a distortion-measuring apparatus for measuring a distortion distribution of an entire vitreous silica crucible in a non-destructive way includes: a light source 11; a first polarizer 12 and a first quarter-wave plate 13 disposed between the light source 11 and an outer surface of a vitreous silica crucible wall; a camera 14 disposed inside of a vitreous silica crucible 1; a camera control mechanism 15 configured to control a photographing direction of the camera 14; a second polarizer 16 and a second quarter-wave plate 17 disposed between the camera 14 and an inner surface of the vitreous silica crucible wall. An optical axis of the second quarter-wave plate 17 inclines 90 degrees with respect to the first quarter-wave plate 13.

Abstract: A laser gas analyzer includes a light emitter which emits a laser light irradiated onto a gas to be measured; a light receiver which receives a laser light which transmitted the gas to be measured; a plurality of optical-axis adjustment mechanisms, one of which is provided in the light emitter and the other one of which is provided in the light receiver; a main display which is provided in one of the light emitter and the light receiver and displays thereon the measured result acquired by receiving the laser light which transmitted the gas to be measured; and a sub-display which is provided in the other one of the light emitter and the light receiver and displays thereon a part of the measured result displayed on the main display.

Abstract: A system and a method for calculating the cetane number, pour point, cloud point and aniline point of gas oil fractions of a crude oil sample from the density and gas chromatographic simulated distribution of the sample.