Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system recognizes patterns in texts that correspond to bibliographical references. User selection of a bibliographical reference causes a digital copy of the work referenced to be made available to the user. Factors such as price, reference format and user feedback are used to select a source from which the digital copy of the work is obtained.

Abstract: An electronic textbook system allows instructors to create custom coursebooks by integrating various materials from disparate sources. Instructors can arrange the materials, format them, provide tables of contents and indices. Payment mechanisms as well as policies for the components are integrated automatically so that the final book satisfies policy requirements for each of its component parts.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system allows third parties to make available to users extensions, or “add-ons”, that provide additional features and functions relating to a book. Add-ons are launched in a manner that takes into account the reader's context, such as a current page the reader is looking at. Payment mechanisms as well as policies for the add-ons are integrated so that restrictions imposed by both book publishers and add-on publishers are respected.

Abstract: Self-healing photocathode device comprising a photoemissive multi-alkali semiconductor comprising a multi-alkali antimonide having the formula AxBy CzSb, where A, B and C are Group I alkali metals and x+y+z=3; a nanostructured porous membrane, one surface of which is in direct contact with the multi-alkali semiconductor and the opposing surface of which is disposed toward the inside of a sealed reservoir, such that the porous membrane and the sealed reservoir form a volume which is maintained at low pressure; a temperature control means in contact with the porous membrane, wherein the temperature control means regulates the temperature of the porous membrane at 200° C. or less; a source comprising elemental cesium which is releasable into the enclosed volume; and, a current conducting means attached to the source.

Abstract: Terahertz radiation source and method of producing terahertz radiation, said source comprising a junction stack, said junction stack comprising a crystalline material comprising a plurality of self-synchronized intrinsic Josephson junctions; an electrically conductive material in contact with two opposing sides of said crystalline material; and a substrate layer disposed upon at least a portion of both the crystalline material and the electrically-conductive material, wherein the crystalline material has a c-axis which is parallel to the substrate layer, and wherein the source emits at least 1 mW of power.