Abstract: A walking assist device including a waist assembly and at least one leg assembly connected to the waist assembly is provided. The leg assembly includes a thigh stand, a shank stand, a sole, a hip joint, a knee joint and an ankle joint. The hip joint is pivoted to the thigh. The knee joint is pivoted to the thigh stand and connected to the shank stand. The ankle joint includes at least a flexible plate and an elastic member. The flexible plate includes a first end and a second end opposite to each other. The first end is pivoted to the shank stand directly or indirectly, the second end is connected to the sole, and the elastic member presses the first end of the flexible plate.

Abstract: A differential-velocity driving device and a mechanical arm to which the differential-velocity driving device is applied are provided. The differential-velocity driving device includes a first rotary driving element, a first transmission gear connected to the first rotary driving element, a second rotary driving element, a second transmission gear connected to the second rotary driving element, a fixing member connected to the first rotary driving element and the second rotary driving element such that the first rotary driving element does not move or rotate with respect to the second rotary driving element, a power output gear engaged with the first transmission gear and the second transmission gear, and an output shaft passing through an axle center of the power output gear and being coaxial with the axle center.

Abstract: A centrifugal fan includes a shell, an impeller, a tongue portion, and a protrusion. The shell includes a top plate, a bottom plate, and a sidewall connecting to the top plate and the bottom plate. The top plate, the bottom plate, and the sidewall define an air outlet. The impeller is disposed in the shell. The tongue portion is disposed in the shell and neighboring the air outlet. The protrusion is disposed on an inner wall of the shell and is physically connected to the top plate and the bottom plate.

Abstract: A joint device includes a rotary shaft, two fixing members, two driving members, two transmission gears, and a link gear. The two driving members are respectively fixed to the two fixing members, and the two fixing members are pivoted to each other through the rotary shaft. The two driving members are respectively connected to and drive the two transmission gears. The link gear is pivoted to the rotary shaft and engaged with the two transmission gears respectively, so that the two driving members are in a transmission relation. The joint device adopts the combination of dual driving members and gear sets, thereby achieving the high reactivity and high load function.

Abstract: The invention provides a fire resistant material and a formulation thereof. The formulation comprises a liquid suspension of a modified inorganic particle and an organic component. The modified inorganic particle comprises an inorganic particle with hydroxyl groups and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The organic component comprises a monomer, oligomer, prepolymer, polymer, or combinations thereof, capable of reacting with the ethylenically unsaturated end group.

Abstract: A joint device includes a rotary shaft, two fixing members, two driving members, two transmission gears, and a link gear. The two driving members are respectively fixed to the two fixing members, and the two fixing members are pivoted to each other through the rotary shaft. The two driving members are respectively connected to and drive the two transmission gears. The link gear is pivoted to the rotary shaft and engaged with the two transmission gears respectively, so that the two driving members are in a transmission relation. The joint device adopts the combination of dual driving members and gear sets, thereby achieving the high reactivity and high load function.

Abstract: The invention provides a fire resistant material and a formulation thereof. The formulation comprises a liquid suspension of a modified inorganic particle and an organic component. The modified inorganic particle comprises an inorganic particle with hydroxyl groups and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The organic component comprises a monomer, oligomer, prepolymer, polymer, or combinations thereof, capable of reacting with the ethylenically unsaturated end group.

Abstract: The invention provides a fire resistant material and a formulation thereof. The formulation comprises a liquid suspension of a modified inorganic particle and an organic component. The modified inorganic particle comprises an inorganic particle with hydroxyl groups and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The organic component comprises a monomer, oligomer, prepolymer, polymer, or combinations thereof, capable of reacting with the ethylenically unsaturated end group.

Abstract: Disclosed is a multi-isocyanate prepolymer formed by reacting diisocyanate and/or diisocyanate trimer with diol and/or triol. Because the prepolymer and the diol/triol have similar molecular weights, additional crosslink agents such as diamine, multi-amine, or combinations thereof are not necessary. Furthermore, the prepolymer can be blown to form foam, or directly gelled to form an unbubbled product such as film.

Abstract: Disclosed are modified inorganic particles and methods of preparing the same. The modified inorganic particle comprises an inorganic particle with hydroxyl groups, and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The method comprises providing an inorganic particle with hydroxyl groups; providing a surface modifier with an isocyanate group at one end and an ethylenically unsaturated group at the other end; and mixing the inorganic particle with the surface modifier for reaction such that the surface modifier is coupled to the inorganic particle.

Abstract: Disclosed are modified inorganic particles and methods of preparing the same. The modified inorganic particle comprises an inorganic particle with hydroxyl groups, and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The method comprises providing an inorganic particle with hydroxyl groups; providing a surface modifier with an isocyanate group at one end and an ethylenically unsaturated group at the other end; and mixing the inorganic particle with the surface modifier for reaction such that the surface modifier is coupled to the inorganic particle.

Abstract: The invention provides a fire resistant material and a formulation thereof. The formulation comprises a liquid suspension of a modified inorganic particle and an organic component. The modified inorganic particle comprises an inorganic particle with hydroxyl groups and a surface modifier coupled to the inorganic particle via a urethane linkage, wherein the surface modifier has an ethylenically unsaturated end group. The organic component comprises a monomer, oligomer, prepolymer, polymer, or combinations thereof, capable of reacting with the ethylenically unsaturated end group.

Abstract: A linear thermoplastic polyurethane is provided. The linear thermoplastic polyurethane is prepared by starting materials of a difunctional hydrophilic polyether-polyol, 4,4-methylene bisphenyl diisocyanate (MDI) and a difunctional aliphatic polyester-polyol, wherein the starting materials of the linear thermoplastic polyurethane have an NCO:OH ratio of about 0.9:1-1.2:1. The invention also provides a method of fabricating the linear thermoplastic polyurethane.

Abstract: Methods and systems with different control rates for uplink and downlink oscillators. The method comprises obtaining the frequency offsets between a receiver oscillator frequency and a carrier frequency of received signals, adjusting the receiver oscillator frequency at a first rate according to the frequency offsets, and adjusting the transmitter oscillator at a second rate according to the first rate. The receiver oscillator frequency is adjusted according to filtered frequency offsets, while the transmitter oscillator frequency is adjusted according to the frequency offsets and smoothed frequency offsets.

Abstract: A thermoplastic polyurethane. The thermoplastic polyurethane includes a hydrophilic polyether-polyol, an aromatic polyisocyanate, and an aliphatic polyester-polyol, wherein the polyurethane has a NCO/OH ratio of about 0.9˜1.2.

Abstract: This invention is directed to a semiconductor rectifier chip comprised of a semiconductor dice with at least one P-N junction, and the entire cutting surface of the dice sealed a passivation glass to omite the use of a expansion plate. The rectifier chip is made of negative or positive silicon semiconductor wafer that has been subjected to standard wafer diffusion process to form P30 -N-N+ or N+-P-P+ layer construction, then to cut into a plurality of dices which having a cutting surface, the cutting surface from N30 to P+ of the dice is sealing by the passivation glass to omite the use of the expansion plate, and the electrode ohmic contact metal for soft soldering or hard brazing purpose is made on both sides of the dice simultaneously.

Abstract: A water-borne polyurethane modified cement composition is prepared from a dispersion of a water-dispersible polyurethane, a cross-linking agent, which is a polycarbodimide having N.dbd.C.dbd.N functional groups, and cement. Optionally, a water-reducing agent, and a surfactant can be added. The modified cement composition has higher tensile strength, elongation, and water resistance.

Abstract: A light level controlled electrical extension socket comprising a main body on which is formed two pairs of insertion sockets for receiving an appliance's power plug, a photosensitive element externally mounted in a housing on the main body, an extension cord attached to a power outlet, and a pair of indicator lights for each respective pair of insertion sockets. Each insertion socket comprises three receiving slots, whereby, a power plug inserted to the right side always receives power as in a convention adapter. A power plug inserted to the left side has its power turned on or off automatically according to prevailing light levels. A first pair of insertion sockets has its power on in automatic mode, i.e. the left side when the second pair has its power turned off, and vice versa. The indicator lights for each corresponding pair of insertion sockets reflect the status of each respective pair.

Abstract: A revolving safety socket of the present invention has a uniquely-designed stand, which serves as a switching device. It consists mainly of a circular hole in the case cover and a circular recess in the case base. Located between the circular hole and the circular recess is a revolving stand having receptacles therein. When the socket is not in use, the conductive member of the revolving stand is not in contact with the copper clip which is connected to the power supply. Only when a plug is inserted into the revolving stand, which is then rotated for a 90-degree angle, would the conductive member become engaged with the copper clip to permit the power supply to be on. Additionally, the socket has the reversed L-shaped fasteners to hold the protruded block of the plug firmly in place, ensuring that the plug can not be accidentally pulled out of the socket.