4,481 research outputs found
Initial Experiences of Building Secure Access to Patient Confidential Data via the Internet
A project to enable health care professionals (GPs, practice nurses and diabetes nurse specialists) to access, via the Internet, confidential patient data held on a secondary care (hospital) diabetes information system, has been implemented. We describe the application that we chose to distribute (a diabetes register); the security mechanisms we used to protect the data (a public key infrastructure with strong encryption and digitally signed messages, plus a firewall); the reasons for the implementation decisions we made; the validation testing that we performed and the preliminary results of the pilot implementation
A new efficient method for determining weighted power spectra: detection of low-frequency solar p-modes by analysis of BiSON data
We present a new and highly efficient algorithm for computing a power
spectrum made from evenly spaced data which combines the noise-reducing
advantages of the weighted fit with the computational advantages of the Fast
Fourier Transform (FFT). We apply this method to a 10-year data set of the
solar p-mode oscillations obtained by the Birmingham Solar Oscillations Network
(BiSON) and thereby uncover three new low-frequency modes. These are the l=2,
n=5 and n=7 modes and the l=3, n=7 mode. In the case of the l=2, n=5 modes,
this is believed to be the first such identification of this mode in the
literature. The statistical weights needed for the method are derived from a
combination of the real data and a sophisticated simulation of the instrument
performance. Variations in the weights are due mainly to the differences in the
noise characteristics of the various BiSON instruments, the change in those
characteristics over time and the changing line-of-sight velocity between the
stations and the Sun. It should be noted that a weighted data set will have a
more time-dependent signal than an unweighted set and that, consequently, its
frequency spectrum will be more susceptible to aliasing.Comment: 11 pages, 7 Figures, accepted for publication in MNRAS, Figure 6 had
to be reduced in size to upload and so may be difficult to view on screen in
.ps versio
Constraint Likelihood analysis for a network of gravitational wave detectors
We propose a coherent method for the detection and reconstruction of
gravitational wave signals for a network of interferometric detectors. The
method is derived using the likelihood functional for unknown signal waveforms.
In the standard approach, the global maximum of the likelihood over the space
of waveforms is used as the detection statistic. We identify a problem with
this approach. In the case of an aligned pair of detectors, the detection
statistic depends on the cross-correlation between the detectors as expected,
but this dependence dissappears even for infinitesimally small misalignments.
We solve the problem by applying constraints on thelikelihood functional and
obtain a new class of statistics. The resulting method can be applied to the
data from a network consisting of any number of detectors with arbitrary
detector orientations. The method allows us reconstruction of the source
coordinates and the waveforms of two polarization components of a gravitational
wave. We study the performance of the method with numerical simulation and find
the reconstruction of the source coordinates to be more accurate than in the
standard approach.Comment: 13 pages, 6 figure
Optical carrier wave shocking: detection and dispersion
Carrier wave shocking is studied using the Pseudo-Spectral Spatial Domain
(PSSD) technique. We describe the shock detection diagnostics necessary for
this numerical study, and verify them against theoretical shocking predictions
for the dispersionless case. These predictions show Carrier Envelope Phase
(CEP) and pulse bandwidth sensitivity in the single-cycle regime. The flexible
dispersion management offered by PSSD enables us to independently control the
linear and nonlinear dispersion. Customized dispersion profiles allow us to
analyze the development of both carrier self-steepening and shocks. The results
exhibit a marked asymmetry between normal and anomalous dispersion, both in the
limits of the shocking regime and in the (near) shocked pulse waveforms.
Combining these insights, we offer some suggestions on how carrier shocking (or
at least extreme self-steepening) might be realised experimentally.Comment: 9 page
Attempts to Identify Wildlife Reservoirs of Rabies in Indonesia
Penyakit rabies telah dikenal di Indonesia sejak tahun 1889, dan mengingat tidak adanya data yang diteliti mengenai penderita rabies, maka perlu dilakukan suatu penelitian. Penelitian dilakukan oleh NAMRU-2 bersama Departemen Kesehatan dari tahun 1970-1972 untuk menentukan pengaruh penyakit-penyakit Zoonotic yang endemic pada penduduk yang tidak immune yang sering berpindah ke hutan atau tempat yang tidak ada penduduknya. Penelitian di lakukan pada beberapa daerah pegunungan Jawa Barat, Jawa Timur, Lampung, Maluku, Kalimantan Tengah, Timor dan Sulawesi Tengah. Hasil penelitian menunjukkan bahwa dari 328 binatang yang diperoleh dari 28 berbagai daerah di Indonesia setelah diadakan pemeriksaan dengan metode fluorecent antibody technique {fat) dan inokuler pada tikus putih ternyata tidak ditemukan virus rabies. Binatang-binatang yang ditemukan tersebut dan kebiasaan hidupnya di lukiskan secara terperinci pada hasil penelitian ini
Pseudo-global Fitting of Gapped Helioseismic Data
Mode fitting or "peak-bagging" is an important procedure in helioseismology
allowing one to determine the various mode parameters of solar oscillations. We
have recently developed a new "pseudo-global" fitting algorithm as a way of
reducing the systematic bias in the fits of certain mode parameters that are
seen when using "local" fitting techniques to analyse "sun-as-a-star" p-mode
data. This new algorithm has been designed specifically to gain the advantages
of fitting the entire power spectrum, while retaining the efficiency of local
fitting techniques.
Using simulated data with a full fill we have previously shown that the
pseudo-global routine reduces the bias in estimates of the frequencies and
asymmetries and in the estimates of the solar background when compared with a
traditional fitting technique. Here we present results that show that the
pseudo-global routine is also effective in reducing bias in the parameter
estimates when the time-series has significant gaps. As such we are now able to
employ the routine in order to fit ground based helioseismic data such as that
collected by the Birmingham Solar Oscillations Network (BiSON).Comment: 6 pages, 3 figures, to be published in the proceedings of GONG
2008/SOHO XX
Results of seed tests for 1917, Bulletin, no. 186
The Bulletin is a publication of the New Hampshire Agricultural Experiment Station, College of Life Sciences and Agriculture, University of New Hampshire, Durham, New Hampshire
Results of seed tests for 1915, Bulletin, no. 177
The Bulletin is a publication of the New Hampshire Agricultural Experiment Station, College of Life Sciences and Agriculture, University of New Hampshire, Durham, New Hampshire
Growth and feed standards for broilers -- 1959, Station Bulletin, no.466
The Bulletin is a publication of the New Hampshire Agricultural Experiment Station, College of Life Sciences and Agriculture, University of New Hampshire, Durham, New Hampshire
Results of seed tests for 1916, Bulletin, no. 180
The Bulletin is a publication of the New Hampshire Agricultural Experiment Station, College of Life Sciences and Agriculture, University of New Hampshire, Durham, New Hampshire
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