Abstract: The present invention relates to a method for preparing a neodymium-iron-boron rare-earth permanent magnetic material, in particular to a hot press molding-based method for preparing a rare-earth permanent magnet. The problem that the residual magnetism and coercive force of a rare-earth permanent magnet prepared in the prior art cannot be both high is solved. An RTM alloy infiltrates same during an HD treatment. RTM sticks to the surface of coarse powder and infiltrates into the interior of the coarse powder along a grain boundary. The temperature of hot press sintering is relatively low, and grains barely grow. In the absence of Dy and Tb, a higher coercive force is obtained. If an alloy containing Dy and Tb is used for infiltration, these atoms diffuse into the surface layer of a main phase during preheating and heat treatment, achieving grain boundary hardening. Under the premise of a very small reduction in the residual magnetism, the coercive force is greatly improved.

Abstract: A card edge connector includes a longitudinal insulating housing including two long walls and a bottom wall connecting with the long wall and defining a card slot in a longitudinal direction among the long walls and the bottom wall, two rows of contact arranged in the long walls respectively. Each contact includes a retaining portion, a spring portion extending from the retaining portion and leg portion extending from the retaining portion and out of the insulating housing. The spring portions define contacting portions projecting into the card slot. Each contact is formed by directly punching out from a metal plate, the retaining portions define an outer edge and inner edge interfered with the insulating housing and two opposite plane faces connecting with the outer and inner edge and disposed perpendicular to the longitudinal direction.

Abstract: A card edge connector includes a longitudinal insulative housing, two rows of terminals and an insulative block fixed therein. The insulative housing includes two side walls and a card slot between the side walls and opening upward, the side walls defines grooves for receiving terminals and opening downward. Each terminal includes a retaining portion fixed in the groove, each row of the terminals including a plurality of signal terminals and a plurality of grounding terminals. Each signal groove loaded with the signal terminal is filled with the insulative block, the block fitly abuts against the retaining portion of the signal terminal.

Abstract: An electrical connector includes an insulative elongated housing with an elongate central slot for receiving a daughter card, a plurality of contacts disposed in the housing by two sides of the central slot, and a mounting section located at one end of the housing with a unitary ejector pivotally mounted therein. The ejector forms a receiving slot for receiving the daughter board, and a pair of engagement arms located by two opposite sides of the receiving slot with corresponding hook at front ends to be engaged within corresponding engagement slots formed in the mounting section. Each deflectable engagement arms includes a metal piece associated therewith not only preventing breaking of the deflectable engagement arm during rotation of the ejector but also enhancing engagement between the ejector and the housing.

Abstract: A restraining material includes a frictional surface configured to press against an object to restrain the object and exert a frictional force thereon. The frictional surface is a pattern surface of a base material of the restraining member that will directly contact with the object. The pattern surface includes island-shaped parts separated by a depression and periodically arranged. The depression has a depth of 15 to 50 ?m with respect to the frictional surface. A periodic arrangement direction of the island-shaped parts includes a direction defined by that: a pattern index determined by dividing an arrangement pitch of the island-shaped parts in a periodic arrangement direction by the maximum diameter of each island-shaped part in the periodic arrangement direction falls within a range of 1.0 to 100, and the maximum diameter of each island-shaped part in the periodic arrangement direction falls within in a range of 0.1 to 2 mm.

Abstract: A card edge connector includes a longitudinal insulating housing including two long walls and a bottom wall connecting with the long wall and defining a card slot in a longitudinal direction among the long walls and the bottom wall, two rows of contact arranged in the long walls respectively. Each contact includes a retaining portion, a spring portion extending from the retaining portion and leg portion extending from the retaining portion and out of the insulating housing. The spring portions define contacting portions projecting into the card slot. Each contact is formed by directly punching out from a metal plate, the retaining portions define an outer edge and inner edge interfered with the insulating housing and two opposite plane faces connecting with the outer and inner edge and disposed perpendicular to the longitudinal direction.

Abstract: A card edge connector includes an elongated insulative housing, a plurality of conductive terminals retained in the housing, and a latching structure. The housing defines a card receiving slot. The latching structure includes a locking portion and an operating portion. The operating portion defines an operating surface. The operating portion is made of insulative material, and a metal plate is attached to the operating surface. The metal plate can effectively improve the technical feeling of the card edge connector and protect the operating surface from being damaged by external tools.

Abstract: A rotor blade for a gas turbine engine includes a blade extending from a root and a contoured tip portion at a first end of the blade. The first end is opposite the root. The contoured tip portion includes a first sloped region and a second sloped region. The second sloped region is steeper than the first sloped region, relative to a platform.

Abstract: A compressor section for a gas turbine engine according to an example of the present disclosure includes, among other things, a low pressure compressor including a plurality of rotor blades arranged about an axis, a high pressure compressor, and a core flowpath passing through the low pressure compressor. The core flowpath at the low pressure compressor defines an inner diameter and an outer diameter relative to the axis. The outer diameter has a slope angle relative to the axis.

Abstract: A comparator circuit is applied to comparing an input voltage and a reference voltage to generate a comparison result. The comparator circuit includes a resistor circuit, a current source circuit and a transistor switching circuit. The resistor circuit receives first and second input voltages in the input voltage. The current source circuit provides a first current and a second current, and the first current, the second current and the resistor circuit generate the reference voltage. The transistor switching circuit generates the comparison result at its output end according to a first control voltage and a second control voltage at its input end. The current source circuit and the resistor circuit generate the first control voltage according to the first current and the first input voltage, and generate the second control voltage according to the second current and the second input voltage.

Abstract: A comparator circuit is applied to comparing an input voltage and a reference voltage to generate a comparison result. The comparator circuit includes a resistor circuit, a current source circuit and a transistor switching circuit. The resistor circuit receives first and second input voltages in the input voltage. The current source circuit provides a first current and a second current, and the first current, the second current and the resistor circuit generate the reference voltage. The transistor switching circuit generates the comparison result at its output end according to a first control voltage and a second control voltage at its input end. The current source circuit and the resistor circuit generate the first control voltage according to the first current and the first input voltage, and generate the second control voltage according to the second current and the second input voltage.

Abstract: Rotor of a gas turbine engines having a rotor hub and a plurality of blades extending from the rotor hub, wherein each blade has a full-span forward sweep along a leading edge of the blade that starts at an airfoil root of the blade at the hub and extends to a blade tip, wherein a sweep of a blade is a percentage of a root axial chord length of the respective blade.

Abstract: A compressor section for a gas turbine engine according to an example of the present disclosure includes, among other things, a low pressure compressor including a plurality of rotor blades arranged about an axis, a high pressure compressor, and a core flowpath passing through the low pressure compressor. The core flowpath at the low pressure compressor defines an inner diameter and an outer diameter relative to the axis. The outer diameter has a slope angle relative to the axis.

Abstract: A compressor may include an airfoil configured to rotate about an axis. The airfoil may have a span measured radially from a root of the airfoil to a tip of the airfoil. A compressor case may be radially adjacent to the airfoil. The airfoil and the compressor case may define a clearance between the tip of the airfoil and a radially inner surface of the compressor case. A ratio of the clearance to the span may be 2.5 percent or less. A mass flow rate of the compressor may be 3.0 pounds-mass per second or less.

Abstract: A compressor may include an airfoil configured to rotate about an axis. The airfoil may have a span measured radially from a root of the airfoil to a tip of the airfoil. A compressor case may be radially adjacent to the airfoil. The airfoil and the compressor case may define a clearance between the tip of the airfoil and a radially inner surface of the compressor case. A ratio of the clearance to the span may be between 1.5 to 2.5 percent.

Abstract: According to various embodiments, there is provided a sensor arrangement including a filter configured to provide an output signal having an output wavelength, the output wavelength having a dependence on a temperature of the filter; a temperature module configured to change the temperature of the filter; a controller circuit configured to control the temperature module for changing the temperature of the filter until the output wavelength increases with decreasing temperature; and a determination circuit configured to determine a dew point of an environment surrounding the sensor arrangement, based on a minimum value of the output wavelength and the dependence.

Abstract: A restraining material includes a frictional surface configured to press against an object to restrain the object and exert a frictional force thereon. The frictional surface is a pattern surface of a base material of the restraining member that will directly contact with the object. The pattern surface includes island-shaped parts separated by a depression and periodically arranged. The depression has a depth of 15 to 50 ?m with respect to the frictional surface. A periodic arrangement direction of the island-shaped parts includes a direction defined by that: a pattern index determined by dividing an arrangement pitch of the island-shaped parts in a periodic arrangement direction by the maximum diameter of each island-shaped part in the periodic arrangement direction falls within a range of 1.0 to 100, and the maximum diameter of each island-shaped part in the periodic arrangement direction falls within in a range of 0.1 to 2 mm.

Abstract: According to various embodiments, there is provided a sensor arrangement including a filter configured to provide an output signal having an output wavelength, the output wavelength having a dependence on a temperature of the filter; a temperature module configured to change the temperature of the filter; a controller circuit configured to control the temperature module for changing the temperature of the filter until the output wavelength increases with decreasing temperature; and a determination circuit configured to determine a dew point of an environment surrounding the sensor arrangement, based on a minimum value of the output wavelength and the dependence.

Abstract: A compressor may include an airfoil configured to rotate about an axis. The airfoil may have a span measured radially from a root of the airfoil to a tip of the airfoil. A compressor case may be radially adjacent to the airfoil. The airfoil and the compressor case may define a clearance between the tip of the airfoil and a radially inner surface of the compressor case. A ratio of the clearance to the span may be between 1.5 to 2.5 percent.

Abstract: Rotor of a gas turbine engines having a rotor hub and a plurality of blades extending from the rotor hub, wherein each blade has a full-span forward sweep along a leading edge of the blade that starts at an airfoil root of the blade at the hub and extends to a blade tip, wherein a sweep of a blade is a percentage of a root axial chord length of the respective blade.