39results about How to "Low environmental sensitivity" patented technology

A low-k dielectric material with increased cohesive strength for use in electronic structures including interconnect and sensing structures is provided that includes atoms of Si, C, O, and H in which a fraction of the C atoms are bonded as Si—CH3 functional groups, and another fraction of the C atoms are bonded as Si—R—Si, wherein R is phenyl, —[CH2]n— where n is greater than or equal to 1, HC═CH, C≡CH2, C≡C or a [S]n linkage, where n is a defined above.

A two-DOF (degree of freedom) heterodyne grating interferometer displacement measurement system comprises a two-frequency laser, a grating interferometer, a measuring grating, a receiver, and an electronic signal processing part. The grating interferometer comprises a polarizing beam splitter, a reference grating and a refraction element. The measurement system measures displacement according to optical grating diffraction, optical Doppler Effect and optical beat frequency principle. A two-frequency laser beam emitted by the two-frequency laser enter the grating interferometer and the measuring grating before two light signals are output to the receiver, and the signals are sent to the electronic signal processing part. When the grating interferometer is in two-DOF linear relative motion with the measuring grating, the system can output two linear displacements. The measurement system allows for sub-nano or higher resolution and precision, and can measure two linear displacements simultaneously. The measurement system has the advantages of insensitivity to environment, high measurement precision, small size, light weight and the like, and after the measurement system is used as a lithography machine ultra-precision workpiece bench position measurement system, comprehensive performances of a workpiece bench can be improved.

A ferrule for an optical fiber connector having open fiber clamping grooves. The ferrule has a body having a plurality of open grooves for clamping the terminating end sections of optical fibers. At least a section of the longitudinal opening of the groove is provided with opposing lips to provide a clamping effect. The width of the longitudinal opening defined between the lips along at least a section of the grooves is narrower than the diameter of the optical fibers to create a tight fit. The grooves and the width of the longitudinal groove openings are shaped and sized to retain the fibers without any clearance to allow for movement of the fiber relative to the groove. Similar grooves may be provided in the ferrule body for alignment guide pins. The grooves are precision formed by high throughput processes, such as stamping and extrusion.

A cable retention structure defining a castellated fiber cable clamping surface. The castellated surface has a series of alternating small and large cavities distributed along the axial direction. The small cavities are sized such that when the castellated surface is pressed against the buffer jacket exterior of the fiber cable, the small cavities will be able to clamp the fiber cable jacket within its full dimensional tolerance range. The large cavities are sized to provide sufficient clearance to accommodate the relatively soft material of the cable jacket which cannot be accommodated by the small cavities. The cable jacket is securely held by the retention structure to prevent slipping. Accordingly, fiber cables having buffer jackets with large dimensional variations can still be securely retained by the castellated retention structure in accordance with the present invention.

An expanded beam ferrule includes a first ferrule halve having reflective surfaces and a second ferrule halve, which together retain optical fibers. The reflective surfaces output light perpendicular to the mid-plane of the ferrule. A sleeve aligns the external surface of two similar ferrules, with the reflective surfaces of the respective ferrules facing each other. Output light from an optical fiber held in the first ferrule is bent and collimated by a reflective surface, transmitted to the facing reflective surface in a second ferrule aligned by the sleeve, which bends the light to input to the optical fiber held in the second ferrule. The ferrule components and / or sleeve are precision formed by high throughput metal stamping. The ferrule is incorporated in an optical fiber connector.

In photomask making, the environmental sensitivity of a chemically amplified photoresist is eliminated, or at least substantially reduced, by overcoating the photoresist with a thin coating (topcoat) of a protective but transmissive material. To provide improved stability during the long time period required for direct writing of a photomask pattern, typically in the range of about 20 hours, the protective topcoat material is pH adjusted to be as neutral in pH as possible, depending on other process variable requirements. For example, a pH adjusted to be in the range from about 5 to about 8 is particularly helpful. Not only is the stability of the chemically amplified photoresist better during direct writing when the protective topcoat is pH adjusted, but a photoresist-coated substrate with pH adjusted topcoat over its surface can be stored longer prior to imaging without adverse consequences.

A ferrule for an optical fiber connector has an external surface for alignment with a complementary surface of an alignment sleeve (i.e., the inside surface of a generally cylindrical or tubular sleeve). The external surface of the ferrule is generally cylindrical, having a sectional contact surface profile that is generally oval in shape. More specifically, a plurality of points of contact between the ferrule and the sleeve are defined along a curve in cross-section, wherein the center of curvature at each of the contact points along this contact point curve (i.e., the curve containing contact points that contribute to alignment) does not lie in the plane of the axis of the array of optical fibers.

A three-DOF (Degree of Freedom) heterodyne grating interferometer displacement measurement system comprises a dual-frequency laser, a grating interferometer, a measurement grating, receivers and an electronic signal processing component; the grating interferometer comprises a polarizing beam splitter, a reference grating and dioptric elements; the measurement system realizes displacement measurement on the basis of grating diffraction, the optical Doppler Effect and the optical beat frequency principle. Three linear displacements can be output by the system when the grating interferometer and the measurement grating perform a three-DOF linear relative motion. The measurement system can reach sub-nanometer and higher resolution and precision, and can simultaneously measure three linear displacements. The measurement system has the advantages of being environmentally insensitive, high in measurement precision, small in size, light in weight, and is capable of improving the overall performances of an ultra-precision stage of a lithography machine as a position measurement system for this stage.

A two-degree-of-freedom heterodyne grating interferometry measurement system, comprising: a single-frequency laser device for emitting a single-frequency laser, and the single-frequency laser can be split into a beam of reference light and a beam of measurement light; an interferometer mirror group and a measurement grating for forming a reference interference signal and a measurement interference signal from the reference light and the measurement light; and a receiving optical fiber for receiving the reference interference signal and the measurement interference signal, wherein a core diameter of the receiving optical fiber is smaller than a width of an interference fringe of the reference interference signal and the measurement interference signal, so that the receiving optical fiber receives a part of the reference interference signal and the measurement interference signal. The measurement system has advantages of insensitivity to grating rotation angle error, small volume, light weight, and a facilitating arrangement.

The invention provides a metal-based powder metallurgy brake pad for a high-speed train and a manufacturing method thereof. The brake pad is made of the following raw materials: matrix components: 30-60% by weight of copper powder and 20-40% by weight of ferrous powder; lubrication components: 8-20% by weight of graphite powder and 1-5% by weight of molybdenum disulfide; friction components: 1-3% by weight of tungsten, 1-3% by weight of corundum, 1-3% by weight of silica sand and 1-3% by weight of boron carbide; friction stable components: 1-4% by weight of 80-400-mesh carbon fiber powder; and a binding material: resin occupying 1-5% of the sum of the weight of the components. The invention further comprises a manufacturing method of the metal-based powder metallurgy brake pad for the high-speed train. A friction system formed by the brake pad and machine wheels is high and stable in friction coefficient, friction coefficient fluctuation is small during braking, and reliability is high.

The invention discloses a wear mitigation method of a linear ultrasonic motor, which belongs to the technical field of ultrasonic motors. In the wear mitigation method of the linear ultrasonic motor, the surface modified technology is used for the linear ultrasonic motor, and a pit-type surface micro-structure is prepared on the friction end face of a stator or a rotator, therefore, wear due to three-body friction is reduced, and the output force, the output power and the service life of the motor are effectively improved. The three-body friction is further reduced by optimizing structural parameters of the pit-type surface micro-structure, and the environmental sensitivity of surface friction is reduced by covering a wear resisting layer on the friction end face of the stator and / or the stator. The invention also discloses the linear ultrasonic motor, and the pit-type surface micro-structure is prepared on the friction end face of the stator or the stator.

The invention relates to a nickel-based alloy with high grain-boundary strength and a preparation method thereof. The nickel-based alloy consists of the chemical components in percentage by weight; 20-25 percent of chromium, 0.2-0.7 percent of copper, 0.01-0.2 percent of carbon, 8.0-10.0 percent of molybdenum, 10-15 percent of cobalt, 0.5-1.5 percent of aluminum, 0.2-0.6 percent of titanium, 0.01-0.02 percent of boron, 0.01-0.03 percent of tungsten, 0.01-0.3 percent of tantalum, 0.02-0.06 percent of rare earth and the balance of nickel and other unavoidable trace impurity elements. The preparation method for the nickel-based alloy with high grain-boundary strength comprises the following steps of (1) preparing raw materials: preparing a proper amount of Incone1617 main material and a small amount of Re, B, Ta and W for component adjustment; and (2) feeding the materials for smelting: putting the materials Cr, Mo, Ta and W which have high smelting points to the bottom of a crucible, then adding the Incone1617 furnace material, sequentially adding the rest of the raw materials, covering the materials with a slag removal agent, and smelting the materials in a vacuum smelting furnace. By the adding of B, Ta and the rare earth elements, the nickel-based alloy is low in environment sensitivity and can achieve effects of purifying the grain boundary and effectively improving the grain-boundary bonding strength.

The invention provides a flexible sensing element of polyvinyl chloride ion gel and a preparation method thereof. The sensing element is composed of polyvinyl chloride ion gel and metal electrodes clamped at both ends thereof; when connected to an active circuit , the sensing element is deformed by force, and its internal resistance will change approximately linearly with the macroscopic deformation; when connected to a passive circuit, the sensing element will be deformed by force, and a potential difference will be generated between the two electrodes; this application The provided sensing elements can be used in flexible sensing systems, both active and passive sensing modes, which have good flexibility, stretchability and environmental adaptability, and can be used in wearable flexible electronic devices, bionic The field of artificial skin has a good application prospect.

The invention provides an organic-inorganic compound oil displacement agent, an organic-inorganic compound oil displacement system as well as a preparation method and application and relates to the technical field of oil displacement agents. The organic-inorganic compound oil displacement agent comprises the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano-particles and 20-100 parts of electropositive amphiphilic polymers. The technical problem that the conventional polyacrylamide has a limited application range in high-temperature high-salt reservoir development is solved. After the organic-inorganic compound oil displacement agent provided by the invention is mixed with injected oil field water to prepare the oil displacement system, by virtue of charge attraction of the electronegative inorganic nano-particles and the electropositive amphiphilic polymers, the plastic viscosity of the oil displacement system is obviously improved, and the environmental sensitivity of the oil displacement system is reduced, so that the organic-inorganic compound oil displacement agent has wide application prospects in the high-temperature high-salt reservoir development.