Study on Intermittent Faults and Electrical Continuity

connector, or incorrect installation during initial manufacture and assembly. Unless such issues are narrowed down to a specific root cause, any corrective actions or troubleshooting will be difficult to carry out, and hence its resolution may not make its way into future designs of the system. This leads to further susceptibility to NFF. Intermittent behaviour is often a clear sign of a partially damaged connector, or a connector undergoing a particular degradation mechanism, with the level of intermittency being further aggravated through process variation of harsh environments and parametric faults. In order to further our understanding of the relationship between degradation, operating conditions, intermittent behaviour within the subject, an experimental investigations have been carried out. This paper is a work in progress paper that illustrates a test regime that has been used to stimulate intermittence in electronic connectors whilst subjected to vibration, using both a traditional oscilloscope and bespoke intermittent fault detection equipment, in order to capture an intermittent signature. The results of these experiments provide an insight into the limitations of test equipment and requirements for future intermittent fault detection techniques

Helicopter simulation validation using flight data

A joint NASA/Army effort to perform a systematic ground-based piloted simulation validation assessment is described. The best available mathematical model for the subject helicopter (UH-60A Black Hawk) was programmed for real-time operation. Flight data were obtained to validate the math model, and to develop models for the pilot control strategy while performing mission-type tasks. The validated math model is to be combined with motion and visual systems to perform ground based simulation. Comparisons of the control strategy obtained in flight with that obtained on the simulator are to be used as the basis for assessing the fidelity of the results obtained in the simulator

Engaging Students in MIS Course through the Creation of e-Businesses: A Self Determination Theory Analysis

We describe an entrepreneurial approach for teaching a Management Information Systems (MIS) course. The course builds on the psychological needs for autonomy, competence and relatedness to encourage student motivation and engagement. Students are required to create new electronic businesses and to build prototypes of their electronic web fronts. Students are also required to use the concepts taught in the course and to analyze the ventures’ strategies, related network externalities, as well as business processes and data analytics. The course was taught since 2009 to five classes with more than two hundred students. Using student evaluation questionnaires and four detailed interviews, we find that more than half of the students are enthusiastic about the new approach, feeling satisfied and even proud of their projects. However, a minority of students found the course over-complicated and even boring. We found also that students who expressed autonomy orientation engaged with the course, while students who expressed impersonal or controlled orientation did not. We believe that this analysis should help instructors in aligning new teaching opportunities created by IT to fit students’ orientations and needs

A complete operational amplifier noise model: analysis and measurement of correlation coefficient

Copyright © 2000 IEEEIn contrast to the general operational amplifier (op amp) noise model widely used, we propose a more complete and applicable noise model, which considers the correlation between equivalent input voltage noise source en and current noise source in. Based on the super-position theorem and equivalent circuit noise theory, our formulae for the equivalent input noise spectrum density of an op amp noise are applied to both the inverting and noninverting input terminals. By measurement, we demonstrate that the new expressions are significantly more accurate. In addition, details of the measurement method for our noise model parameters are given. A commercial operational amplifier (Burr-Brown OPA37A) is measured by means of a low-frequency noise power spectrum measuring system and the measured results of its noise model parameters, including the spectral correlation coefficient (SCC), are finally given.Jiansheng Xu, Yisong Dai, and Derek Abbot

Proposed method for searches of gravitational waves from PKS 2155-304 and other blazar flares

We propose to search for gravitational waves from PKS 2155-304 as well as other blazars. PKS 2155-304 emitted a long duration energetic flare in July 2006, with total isotropic equivalent energy released in TeV gamma rays of approximately $10^{45}$ ergs. Any possible gravitational wave signals associated with this outburst should be seen by gravitational wave detectors at the same time as the electromagnetic signal. During this flare, the two LIGO interferometers at Hanford and the GEO detector were in operation and collecting data. For this search we will use the data from multiple gravitational wave detectors. The method we use for this purpose is a coherent network analysis algorithm and is called {\tt RIDGE}. To estimate the sensitivity of the search, we perform numerical simulations. The sensitivity to estimated gravitational wave energy at the source is about $2.5 \times 10^{55}$ ergs for a detection probability of 20%. For this search, an end-to-end analysis pipeline has been developed, which takes into account the motion of the source across the sky.Comment: 10 pages, 7 figures. Contribution to 12th Gravitational Wave Data Analysis Workshop. Submitted to Classical and Quantum Gravity. Changes in response to referee comment

Effects of the R-parity violation in the minimal supersymmetric standard model on dilepton pair production at the CERN LHC

We investigate in detail the effects of the R-parity lepton number violation in the minimal supersymmetric standard model (MSSM) on the parent process $pp \to e^+ e^- + X$ at the CERN Large Hadron Collider (LHC). The numerical comparisons between the contributions of the R-parity violating effects to the parent process via the Drell-Yan subprocess and the gluon-gluon fusion are made. We find that the R-violating effects on $e^+ e^-$ pair production at the LHC could be significant. The results show that the cross section of the $e^+ e^-$ pair productions via gluon-gluon collision at the LHC can be of the order of $10^2$ fb, and this subprocess maybe competitive with the production mechanism via the Drell-Yan subprocess. We give also quantitatively the analysis of the effects from both the mass of sneutrino and coupling strength of the R-parity violating interactions.Comment: 18 pages, 10 figures, accepted by Phys. Rev.

Synchronization in a ring of pulsating oscillators with bidirectional couplings

We study the dynamical behavior of an ensemble of oscillators interacting through short range bidirectional pulses. The geometry is 1D with periodic boundary conditions. Our interest is twofold. To explore the conditions required to reach fully synchronization and to invewstigate the time needed to get such state. We present both theoretical and numerical results.Comment: Revtex, 4 pages, 2 figures. To appear in Int. J. Bifurc. and Chao

The Impact of a Two-Visit Occupational Therapy Home Modification Model on Low-Income Older Adults

Background: Various studies support the benefit of occupational therapist-led home modification to support successful aging in place for older adults. However, methodological differences limit generalizability. This study aimed to determine the impact of a replicable two-visit occupational therapy home modification program on occupational performance of low-income, community-dwelling older adults. Method: The researcher used a quasi-experimental one group pretest-posttest design. The participants were low-income homeowners, age 55 years and older, with decreased performance and/or satisfaction in one or more ADLs and IADLs as determined by the COPM. An occupational therapist provided the participants with a home safety assessment using the Rebuilding Together Safe at Home Checklist, along with a follow-up visit to deliver equipment and education. Results: Data analysis using paired t-tests revealed statistically significant increases in COPM performance and satisfaction ratings from pretest to posttest for the nine participants. The mean average total costs for home modification were $10,396.65 compared to average annual health care costs from$22,763 to $154,478. Conclusion: A two-visit model of occupational therapist-led home modifications benefits low-income older adults. This study provides support for these cost-effective services in support of AOTA’s Vision 2025, to maximize health, well-being, and quality of life for all people, populations, and communities through effective solutions that facilitate participation in everyday living

The Role of CP violation in D0 anti-D0 Mixing

In current searches for D0 anti-D0 mixing, the time evolution of ``wrong-sign'' decays is used to distinguish between a potential mixing signal and the dominant background from doubly-Cabibbo-suppressed decays. A term proportional to $\Delta Mt$ in the expression for the time evolution is often neglected in theoretical discussions and experimental analyses of these processes. We emphasize that, in general, this term does not vanish even in the case of CP invariance. Furthermore, CP invariance is likely to be violated if the rate of D0 anti-D0 mixing is close to the experimental bound. The consequence of either of these two facts is that the strongest existing measured bound is not applicable for constraining New Physics.Comment: 14 pages, uuencoded gzip-compressed postscript (84 kB