Abstract: An abrasion resistant steel consisting essentially of, in weight %: 0.20-0.30% carbon, 0.40-1.25% manganese, 0.05% maximum phosphorous, 0.01% maximum sulfur, 0.20-0.60% silicon, 0.50-1.70% chromium, 0.20-2.00% nickel, 0.07-0.60% molybdenum, 0.010-0.10% titanium, 0.001-0.10% boron, 0.015-0.10% aluminum, balance iron, and incidental impurities. The steel may be melted and cast into a steel ingot or slab, hot rolled to a desired plate thickness; austenitized at 1650-1700° F.; water quenched; and tempered at 350-450° F. The resulting steel plate may have a surface hardness of at least 440 HBW, a mid-thickness hardness of at least 90% of the surface hardness, and toughness in the transverse direction at ?60° F. of at least 20 ft-lbs and at room temperature of at least 40 ft-lbs.

Abstract: An abrasion resistant steel consisting essentially of, in weight %: 0.20-0.30% carbon, 0.40-1.25% manganese, 0.05% maximum phosphorous, 0.01% maximum sulfur, 0.20-0.60% silicon, 0.50-1.70% chromium, 0.20-2.00% nickel, 0.07-0.60% molybdenum, 0.010-0.10% titanium, 0.001-0.10% boron, 0.015-0.10% aluminum, balance iron, and incidental impurities. The steel may be melted and cast into a steel ingot or slab, hot rolled to a desired plate thickness; austenitized at 1650-1700° F.; water quenched; and tempered at 350-450° F. The resulting steel plate may have a surface hardness of at least 440 HBW, a mid-thickness hardness of at least 90% of the surface hardness, and toughness in the transverse direction at ?60° F. of at least 20 ft-lbs and at room temperature of at least 40 ft-lbs.

Abstract: Automated data exchange between a student information system and a course management system using an application programming interface that is directly exposed to the student information system as a web-service is disclosed. Submission of a new user record, enrollment of a user in a course, or changing user or course information triggers automatic data synchronization between the student information system and the course management system. The application programming interface provides single sign-on and bidirectional synchronization capabilities as well as real-time and asynchronous batch processing capabilities. The application programming interface supports XML, flat file, and web services processes and incorporates the IMS Enterprise v1.1 Specification standards.

Abstract: The invention includes an electronic gradebook having instructor and student interfaces with various points possible values, points awarded values, and instructor comment fields associated with gradable items within various gradebook views. Instructor interface options allow instructors to control student access to point values and to adjust, curve, or weight point values. Gradebook features enable instructors to allow students additional time or opportunity to complete or resubmit items, and to track student activity relative to gradable items. The invention also includes a method of compiling activity concerning course tools into a gradebook for an on-line educational system. The system and method track a student's use of a plurality of disparate course tools in an on-line educational system, and they record information from the tracking identifying the student's activity in the plurality of disparate course tools.

Abstract: An on-line educational notebook for selectively providing access to submitted on-line content is disclosed. The notebook allows authorized users to add, edit, and delete various text, audio, video, graphics, or multimedia content items. A student may also enter course notes in the on-line notebook and selectively share certain items with an instructor for review, comment, or grading.

Abstract: An on-line educational system. An instructor builds a course on-line containing identification of assignments and educational materials, which are compiled into an on-line electronic syllabus. Users enrolled in the course may access the electronic syllabus and perform various functions with the on-line educational system in order to participate in the on-line educational course.

Abstract: Each keel panel for a punt-like boat is formed from aluminum sheet having a relatively low temper/high degree of extensibility and the bow portion is stretched formed over a die in a metal stretching machine. The hull construction of the boat has a keel, chines and gunwales formed from aluminum extrusions, interconnected by transverse ribs, where the keel panels are connected to the keel, chines and gunwales but are not connected to the ribs to permit limited movement relative thereto.

Abstract: A grade stake driver includes a frame for supporting a hammer and a grade stake under the hammer. A shuttle secured to the hammer movably mounts onto the frame to connect the hammer to the frame. A hoist secured to the shuttle mounts onto the frame to permit the raising and lowering of the hammer. A receiver mounted on the frame outputs a control signal in response to a transmitted signal. A switch mounted on the frame transforms the control signal into an on/off signal. A relay mounted on the frame connects the hammer to a power source in response to the on/off signal, thereby effecting the driving of the grade stake.