Abstract: A computer system displays a first object that includes at least a first portion of the first object and a second portion of the first object and detects a first gaze input that meets first criteria, wherein the first criteria require that the first gaze input is directed to the first portion of the first object in order for the first criteria to be met. In response, the computer system displays a first control element that corresponds to a first operation associated with the first object, wherein the first control element was not displayed prior to detecting that the first gaze input met the first criteria, and detects a first user input directed to the first control element. In response to detecting the first user input directed to the first control element, the computer system performs the first operation with respect to the first object.

Abstract: A computer system displays a first application user interface at a first location in a three-dimensional environment. While displaying the first application user interface at the first location in the three-dimensional environment, the computer system detects, at a first time, a first input corresponding to a request to close the first application user interface. In response to detecting the first input corresponding to a request to close the first application user interface: the computer system closes the first application user interface, including ceasing to display the first application user interface in the three-dimensional environment; and, in accordance with a determination that respective criteria are met, the computer system displays a home menu user interface at a respective home menu position that is determined based on the first location of the first application user interface in the three-dimensional environment.

Abstract: The present application relates to a concrete pre-mix composition comprising a cementitious material and a plurality of conductive carbon microfibers mixed with said cementitious material, where said conductive carbon microfibers are present in the concrete pre-mix composition in an amount such that, when said concrete pre-mix composition is hydrated to form concrete and cured, the conductive carbon microfibers are dispersed in the cured concrete in an amount of 0.75% to 2.00% of total mass of the concrete. The present application further relates to a concrete composition, a method of producing an electrically conductive concrete composition, an electrically conductive cured concrete form, and a system for heating pavement.

Abstract: The present application relates to a concrete pre-mix composition comprising a cementitious material and a plurality of conductive carbon microfibers mixed with said cementitious material, where said conductive carbon microfibers are present in the concrete pre-mix composition in an amount such that, when said concrete pre-mix composition is hydrated to form concrete and cured, the conductive carbon microfibers are dispersed in the cured concrete in an amount of 0.75% to 2.00% of total mass of the concrete. The present application further relates to a concrete composition, a method of producing an electrically conductive concrete composition, an electrically conductive cured concrete form, and a system for heating pavement.

Abstract: The present application relates to a concrete pre-mix composition comprising a cementitious material and a plurality of conductive carbon microfibers mixed with said cementitious material, where said conductive carbon microfibers are present in the concrete pre-mix composition in an amount such that, when said concrete pre-mix composition is hydrated to form concrete and cured, the conductive carbon microfibers are dispersed in the cured concrete in an amount of 0.75% to 2.00% of total mass of the concrete. The present application further relates to a concrete composition, a method of producing an electrically conductive concrete composition, an electrically conductive cured concrete form, and a system for heating pavement.

Abstract: An adjustable chock having a biforcated handle (20) with a shaft (30) tensionally positioned between the forks in closed loop fashion. Three opposed cams (34) with teeth on the periphery are positioned on the shaft (30) and spring loaded to rotate to their widest point of separation. A pull rod (40) is slideably located within a slot (28) in each fork of the handle (20) with a connecting link (42) pivotally attached on one end to the link and on the other to the cam (34). When the pull rod (40) is manually retracted, the cams (34) are rotated to their minimum width for insertion into a rock fissure and when released spring loadingly return to the open position for gripping the internal surface in a chock like manner.

Abstract: An adjustable chock having a biforcated handle (20) with a shaft (30) tensionally positioned between the forks in closed loop fashion. Three opposed cams (34) with teeth on the periphery are positioned on the shaft (30) and spring loaded to rotate to their widest point of separation. A pull rod (40) is slideably located within a slot (28) in each fork of the handle (20) with a connecting link (42) pivotally attached on one end to the link and on the other to the cam (34). When the pull rod (40) is manually retracted, the cams (34) are rotated to their minimum width for insertion into a rock fissure and when released spring loadingly return to the open position for gripping the internal surface in a chock like manner.