Abstract: A shear-thinning hydrogel composition includes: a first polymer chain including: (i) a first plurality of units each having at least one of a monosaccharide and an amino acid; and (ii) a cross-linking group bound to the at least one of the monosaccharide and the amino acid of one of the first plurality of units via conversion of a carboxyl group of the unit to a peptide bond; a second polymer chain including a second plurality of the units; and a cross-linking additive connecting one of the second plurality of units to the first polymer chain via the cross-linking group.

Abstract: A shear-thinning hydrogel composition includes: a first polymer chain including: (i) a first plurality of units each having at least one of a monosaccharide and an amino acid; and (ii) a cross-linking group bound to the at least one of the monosaccharide and the amino acid of one of the first plurality of units via conversion of a carboxyl group of the unit to a peptide bond; a second polymer chain including a second plurality of the units; and a cross-linking additive connecting one of the second plurality of units to the first polymer chain via the cross-linking group.

Abstract: A shear-thinning hydrogel composition includes: a first polymer chain including: (i) a first plurality of units each having at least one of a monosaccharide and an amino acid; and (ii) a cross-linking group bound to the at least one of the monosaccharide and the amino acid of one of the first plurality of units via conversion of a carboxyl group of the unit to a peptide bond; a second polymer chain including a second plurality of the units; and a cross-linking additive connecting one of the second plurality of units to the first polymer chain via the cross-linking group.

Abstract: A shear-thinning hydrogel composition includes: a first polymer chain including: (i) a first plurality of units each having at least one of a monosaccharide and an amino acid; and (ii) a cross-linking group bound to the at least one of the monosaccharide and the amino acid of one of the first plurality of units via conversion of a carboxyl group of the unit to a peptide bond; a second polymer chain including a second plurality of the units; and a cross-linking additive connecting one of the second plurality of units to the first polymer chain via the cross-linking group.

Abstract: A pneumatic exercise foot pad device includes two primary tubes and a secondary tube disposed between left and right foot pads having air chambers. The primary tubes intercommunicate fluidly the foot pads in proximity to front and rear ends of the foot pads. The secondary tube intercommunicates fluidly central portions of the foot pads. A shell is disposed between the left and right foot pads to cover the primary and secondary tubes. Two adjustment screw rods extend respectively through screw holes formed in the shell to press or unpress the primary tubes so that the primary tubes block or unblock an air flow between the foot pads.

Abstract: A carton includes a cuboid body and a cuboid cover both formed by folding paper board. The body includes first through fourth external wall plates connected through creases. The bottom edge of the first external wall plate is connected with an inner bottom plate. The bottom edge of the third external wall plate is connected with an external bottom plate, and two side edges of the external bottom plate are connected with a second internal wall plate and a fourth internal wall plate. The first through fourth external wall plates and the external bottom plate form a cuboid structure. A second internal wall plate is in contact with the inner surface of the second external wall plate. The fourth internal wall plate is in contact with the inner surface of the fourth external wall plate. The inner bottom plate in contact with the inner surface of the external bottom plate.

Abstract: A pneumatic exercise foot pad device includes two primary tubes and a secondary tube disposed between left and right foot pads having air chambers. The primary tubes intercommunicate fluidly the foot pads in proximity to front and rear ends of the foot pads. The secondary tube intercommunicates fluidly central portions of the foot pads. A shell is disposed between the left and right foot pads to cover the primary and secondary tubes. Two adjustment screw rods extend respectively through screw holes formed in the shell to press or unpress the primary tubes so that the primary tubes block or unblock an air flow between the foot pads.

Abstract: A mouse includes a base (100), function keys (110) arranged on the base (100), an optical transmitting and receiving device (300) used for transmitting and receiving data information and a finger-back pressure plate (200) movably connected with the base (100). The mouse is small, convenient to carry and operate.

Abstract: A ski exercising apparatus includes a ski unit including two ski members each having a wavy slide rail extending in a front-to-rear direction, two pedal units mounted slidably and respectively on the slide rails of the ski members, at least one pull rope mounted movably to the ski members and having two opposite ends connected respectively to the pedal units, two handle units connected pivotally and respectively to the ski members, and at least one connection unit disposed between and interconnecting the ski members and adjustable to change the position and orientation of one of the ski members relative to that of the other ski member.

Abstract: A ski exercising apparatus includes a ski unit including two ski members each having a wavy slide rail extending in a front-to-rear direction, two pedal units mounted slidably and respectively on the slide rails of the ski members, at least one pull rope mounted movably to the ski members and having two opposite ends connected respectively to the pedal units, two handle units connected pivotally and respectively to the ski members, and at least one connection unit disposed between and interconnecting the ski members and adjustable to change the position and orientation of one of the ski members relative to that of the other ski member.

Abstract: Computer-implemented methods and apparatus, including computer program products, implement techniques for validating and correcting structured electronic documents. The techniques include identifying a structural aspect of a structured electronic document that fails to conform to rules of a markup language format. One or more changes are suggested that would correct the identified structural aspect. User input is received selecting a change of the suggested changes. The selected change is applied to the structured electronic document. The rules are associated with the structured electronic document.

Abstract: An adjustable dumbbell assembly of the type including two sets of weights, each including a radial opening extending from a central area to a peripheral area and at least one transversely extending opening in the central area communicating with said radial opening, and a weight supporting assembly operable to selectively connect and disconnect the two sets of weights thereto on opposite sides of a centrally located handle. The weight supporting assembly on each side includes a fixed weight supporting structure, movable weight selector structure, and manually turnable actuating structure. The structures are interrelated with respect to one another, so that when the fixed structure is in an operative position with respect to the weights, manually turning the actuating structure in one direction moves the selector structure in one direction and manually turning the actuating structure in an opposite direction moves the selector structure in the opposite direction.

Abstract: A lecture presentation system includes a display screen and a projector for projecting an image onto the display screen. The display screen has image-receiving strip members linked to one another for receiving the image projected from the projector and an open space between each two adjacent strip members. Another lecture presentation system disclosed by the present invention includes a display screen for displaying an image. The display screen is formed of strip-like LCDs (liquid crystal displays) coupled to one another and respectively spaced from one another by an open space.

Abstract: A weight-adjustable dumbbell includes a dumbbell shell unit, a weight unit, and an insert pin unit. The dumbbell shell unit includes a shell body confining a receiving space, and a weight selector rod connected to the shell body, extending into the receiving space, and formed with through holes registered with insert holes in the shell body. The weight unit is extended removably into the receiving space via an open bottom of the shell body, and includes a base member provided with two positioning posts, and weight pieces stacked on the base member. Each weight piece is formed with a rod hole for extension of the weight selector rod, and two post holes for extension of the positioning posts. The insert pin unit includes an insert pin inserted removably into a selected insert hole and extending removably through a corresponding through hole in the weight selector rod.

Abstract: An exercising ball includes an inflatable ball body made of an elastic material and defining a chamber, and a moving element disposed movably in the chamber. The inflatable ball body has a passage hole that permits the moving element to enter the chamber, and an inflation valve fitted sealingly and removably in the passage hole.

Abstract: A dumbbell includes: a hollow grip bar having a connecting end; a weight adjusting mechanism including a screw rod extending into the grip bar and operable to rotate relative to the grip bar about a rotation axis, and a weight carrier extending into the grip bar and engaging threadedly the screw rod so as to be movable axially upon rotation of the screw rod about the rotation axis, the weight carrier having a weight-supporting part extending outwardly through the connecting end of the grip bar; and a plurality of weights, each of which is formed with an elongate notch having an enlarged central portion for extension of the weight-supporting part of the weight carrier therethrough.

Abstract: An adjustable dumbbell includes a shaft provided with left- and right-handed threads, two tubes sleeved around and engaging threadedly and respectively the left- and right-handed threads, a hollow grip rod sleeved on the tubes, two support units each having upper and lower support seats disposed above and below one of the tubes, and a plurality of weights each having an engaging hole section engageable with a corresponding tube. Two adjustment knob units are respectively connected to two connecting ends of the shaft to turn the shaft and to thereby move the tubes in opposite directions towards or away from the connecting ends. Each tube is movable between the support seats to selectively engage one or more engaging hole sections of the weights.

Abstract: A dumbbell includes: a hollow grip bar having a connecting end; a weight adjusting mechanism including a screw rod extending into the grip bar and operable to rotate relative to the grip bar about a rotation axis, and a weight carrier extending into the grip bar and engaging threadedly the screw rod so as to be movable axially upon rotation of the screw rod about the rotation axis, the weight carrier having a weight-supporting part extending outwardly through the connecting end of the grip bar; and a plurality of weights, each of which is formed with an elongate notch having an enlarged central portion for extension of the weight-supporting part of the weight carrier therethrough.

Abstract: An adjustable dumbbell assembly of the type including two sets of weights, each including a radial opening extending from a central area to a peripheral area and at least one transversely extending opening in the central area communicating with said radial opening, and a weight supporting assembly operable to selectively connect and disconnect the two sets of weights thereto on opposite sides of a centrally located handle. The weight supporting assembly on each side includes a fixed weight supporting structure, movable weight selector structure, and manually turnable actuating structure. The structures are interrelated with respect to one another, so that when the fixed structure is in an operative position with respect to the weights, manually turning the actuating structure in one direction moves the selector structure in one direction and manually turning the actuating structure in an opposite direction moves the selector structure in the opposite direction.

Abstract: A vehicle stability enhancement system that is adapted for an estimated driver workload. The system includes a driver workload estimation processor that estimates the driver workload based on certain factors, such as the vehicle speed or driver-behavior factors. The driver workload estimation is used to adjust the damping ratio and natural frequency in dynamic filters in a command interpreter to adjust a desired yaw rate signal and a desired side-slip signal. The driver workload estimation is also used to generate a yaw rate multiplication factor and a side-slip multiplication factor that modify a yaw rate stability signal and a side-slip stability signal in a feedback control processor that generates a stability control signal.