Low-temperature, high-resolution magnetic force microscopy using a quartz tuning fork

We have developed a low temperature, high resolution magnetic force microscope (MFM) using a quartz tuning fork that can operate in a magnetic field. A tuning fork with a spring constant of 1300 N/m mounted with a commercial MFM cantilever tip was used. We have obtained high resolution images of the stray magnetic fields exerted from grains with a spatial resolution of 15 nm and force resolution of 2 pN at 4.2 K. Tuning fork based magnetic force microscopes have the potential to be used at millikelvin temperatures due to their low power dissipation and high force sensitivity.Comment: 3page

Tools and Techniques for testing of Flight Critical Software

Flight control system software is a critical component of the digital flight control computer of light combat aircraft. The problems associated with the testing of flight critical software and the test tools, and techniques used to achieve maintainability, and structural and functional coverage of test cases are presented. Also, the experience gained throughout the cycle of testing-design and implementation, reviews and revisions, test execution and software error detection and modificaton of test cases based on requirements and design changes, and regression testing are enumerated. It presents an object-oriented approach towards testing to make it less tedious, more creative, reviewable and easily miantainable