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A DAQ card based mixed signal virtual oscilloscope
Complex signals find many applications in SONAR, RADAR, Echo Location Systems and for studying the resonant frequencies. Digital Storage Oscilloscopes (DSO) is used these days for acquisition and display of routine signals. This instrument, found in every measurement laboratory, though potent in displaying simple periodic waveforms like sinusoids fails when frequency-varying time signals are applied. This problem surfaces because the underlying technique of oscilloscope used to trigger the waveform does not acquiesce with complex signals like chirp. Ready solution to this problem is the mixed signal oscilloscope. This is a costly solution and small laboratories cannot afford to have the costly instruments. In this paper, a cost effective DAQ card based mixed signal virtual oscilloscope is proposed to study the complex signals. An intelligent technique, Weighted Hamming Distance (WHD) algorithm was used to accurately trigger the complex waveforms. Also for frequency domain analysis, Joint Time Frequency Analysis (JTFA) techniques were used. A LabVIEWTM based virtual instrument was designed and developed with a capability to acquire, display and analyze the triggered signal. The integrated programming language LabVIEWTM was chosen as it offers many simple ready to use functions. In a way the proposal offers a cost effective, fast and flexible solution to treat the complex signals. The need to create such solutions is the consequence of costly hardware systems. The deficiency of conventional hardware, scheme for the virtual oscilloscope for complex signals with some real time experimental results are presented in this work
Geometric discord and Measurement-induced nonlocality for well known bound entangled states
We employ geometric discord and measurement induced nonlocality to quantify
non classical correlations of some well-known bipartite bound entangled states,
namely the two families of Horodecki's (, and
dimensional) bound entangled states and that of Bennett etal's in
dimension. In most of the cases our results are analytic and both
the measures attain relatively small value. The amount of quantumness in the
bound entangled state of Benatti etal and the state
having the same matrix representation (in computational basis) is same.
Coincidently, the Werner and isotropic states also exhibit the
same property, when seen as dimensional states.Comment: V2: Title changed, one more state added; 11 pages (single column), 2
figures, accepted in Quantum Information Processin
Comparison of hot-electron transmission in ferromagnetic Ni on epitaxial and polycrystalline Schottky interfaces
The hot-electron attenuation length in Ni is measured as a function of energy
across two different Schottky interfaces viz. a polycrystalline Si(111)/Au and
an epitaxial Si(111)/NiSi_2 interface using ballistic electron emission
microscopy (BEEM). For similarly prepared Si(111) substrates and identical Ni
thickness, the BEEM transmission is found to be lower for the polycrystalline
interface than for the epitaxial interface. However, in both cases, the
hot-electron attenuation length in Ni is found to be the same. This is
elucidated by the temperature-independent inelastic scattering, transmission
probabilities across the Schottky interface, and scattering at dissimilar
interfaces.Comment: 5 pages, 5 figure
Sharp change over from compound nuclear fission to shape dependent quasi fission
Fission fragment mass distribution has been measured from the decay of
Bk nucleus populating via two entrance channels with slight difference
in mass asymmetries but belonging on either side of the Businaro Gallone mass
asymmetry parameter. Both the target nuclei were deformed. Near the Coulomb
barrier, at similar excitation energies the width of the fission fragment mass
distribution was found to be drastically different for the N +
Th reaction compared to the B + U reaction. The entrance
channel mass asymmetry was found to affect the fusion process sharply.Comment: 4 pages,6 figure
Cancer of the penis: case report
Two patients with penile carcinoma are presented after management at a district hospital in Kenya. Both had undergone ritual circumcision as teenagers and presented late. HR was a 73 year old who presented with a fungating penile mass for which a partial penectomy was performed after wedge biopsy confirmed malignancy. He thereafter declined to have the surgical specimen sent for histology and took the amputated stump for burial in his compound to avoid bad omen. GK was 25 years old and presented with a fungating mass and underwent partial penectomy after a histological diagnosis was made. He absconded from follow-up after being informed of the need for further surgery due to tumour infiltration of the surgical margins. The history and clinical images are presented and we discuss the difficulties of cancer management at a rural district hospital
Using privacy calculus theory to explore entrepreneurial directions in mobile location-based advertising: Identifying intrusiveness as the critical risk factor
Location-based advertising is an entrepreneurial and innovative means for advertisers to reach out through
personalised messages sent directly to mobile phones using their geographic location. The mobile phone users'
willingness to disclose their location and other personal information is essential for the successful im-
plementation of mobile location-based advertising (MLBA). Despite the potential enhancement of the user ex-
perience through such personalisation and the improved interaction with the marketer, there is an increasing
tension between that personalisation and mobile users' concerns about privacy. While the privacy calculus
theory (PCT) suggests that consumers make privacy-based decisions by evaluating the benefits any information
may bring against the risk of its disclosure, this study examines the specific risks and benefits that influence
consumers' acceptance of MLBA. A conceptual model is proposed based on the existing literature and a stan-
dardised survey was developed and targeted at individuals with known interests in the subject matter. From
these requests, 252 valid responses were received and used to evaluate the key benefits and risks of MLBA from
the users' perspectives. While the results confirmed the importance of internet privacy concerns (IPC) as an
important determinant, they also indicate that monetary rewards and intrusiveness have a notably stronger
impact on acceptance intentions towards MLBA. Intrusiveness is the most important risk factor in determining
mobile users' intentions to accept MLBA and therefore establishing effective means of minimising the perceived
intrusiveness of MLBA can be expected to have the greatest impact on achieving effective communications with
mobile phone users
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