Abstract: A method for test configuration on a first math assistance device is provided that includes receiving a test code by the first math assistance device, wherein the test code includes one or more functionality restrictions, and entering secure test mode on the first math assistance device with the one or more functionality restrictions.

Abstract: An acoustic energy cleaning system and method which fosters micro-bubble formation for effective cleaning while buffering micro-bubble growth which would otherwise damage the wafer. In one embodiment, the invention includes combining a first frequency signal and a second frequency signal having a positive amplitude bias component so as to form a combined signal. The combined signal, which has a positive amplitude offset, is applied to a transducer system that converts the combined signal into acoustic waves. The acoustic waves can be applied to the object to be cleaned in a cleaning fluid.

Abstract: A wafer cleaning method and system including a combined high frequency signal, a low frequency signal, and in one embodiment a biased voltage signal, allows cleaning particles and impurities off of fine-structured wafers, through application of an acoustic field to the wafer through a cleaning liquid which fosters micro-bubble formation for effective cleaning while buffering micro-bubble growth which would otherwise damage the wafer.

Abstract: A handheld computing device includes a display screen, a main housing portion, a removable case, and a stand member. The main housing retains the display screen. The removable case is adapted to slidably fit over at least part of the main housing. The stand member is pivotably coupled to the case. The stand member, the case, and the main housing are configured so that the main housing may be retained at a tilt angle relative to a surface by the stand member and the case when the case is laying on the surface and when the stand member is pivoted relative to the case to form a stand angle between the stand member and the case. Preferably, the handheld computing device is a system adapted to have a storage configuration, a laying usage configuration, and a tilted usage configuration. The handheld computing device may be a graphing calculator, for example.

Abstract: An apparatus and method for substrate processing, specifically including cleaning and/or photoresist stripping, in non-immersion type megasonic processing tools. In one embodiment, the invention utilizes the concept of dissolving a gas into a liquid at or near the point of use with a gasifier, such as a membrane contactor, during the processing of the substrate, thus eliminating the need for pre-made liquid/gas processing mixtures that are typically stored in auxiliary tanks.

Abstract: A wafer cleaning method and system including a combined high frequency signal, a low frequency signal, and in one embodiment a biased voltage signal, allows cleaning particles and impurities off of fine-structured wafers, through application of an acoustic field to the wafer through a cleaning liquid which fosters micro-bubble formation for effective cleaning while buffering micro-bubble growth which would otherwise damage the wafer.