1,215 research outputs found
Full Sky Study of Diffuse Galactic Emission at Decimeter Wavelengths
A detailed knowledge of the Galactic radio continuum is of high interest for
studies of the dynamics and structure of the Galaxy as well as for the problem
of foreground removal in Cosmic Microwave Background measurements. In this work
we present a full-sky study of the diffuse Galactic emission at frequencies of
few GHz, where synchrotron radiation is by far the dominant component. We
perform a detailed combined analysis of the extended surveys at 408, 1420 and
2326 MHz (by Haslam et al. 1982, Reich 1982, Reich & Reich, 1986 and Jonas et
al. 1998, respectively). Using the technique applied by Schlegel et al. (1998)
to the IRAS data, we produce destriped versions of the three maps. This allows
us to construct a nearly-full-sky map of the spectral index and of the
normalization factor with sub-degree angular resolution. The resulting
distribution of the spectral indices has an average of beta = 2.695 and
dispersion sigma_{beta} = 0.120. This is representative for the Galactic
diffuse synchrotron emission, with only minor effects from free-free emission
and point sources.Comment: 10 pages, 16 jpeg figures, accepted to Astronomy & Astrophysics,
Comments and figure adde
Cosmic microwave background power spectrum estimation with the destriping technique
Extraction of the CMB (Cosmic Microwave Background) angular power spectrum is
a challenging task for current and future CMB experiments due to the large data
sets involved. Here we describe an implementation of MASTER (Monte carlo
Apodised Spherical Transform EstimatoR) which exploits the destriping technique
as a map-making method. In this method a noise estimate based on destriped
noise-only MC (Monte Carlo) simulations is subtracted from the pseudo angular
power spectrum. As a working case we use realistic simulations of the PLANCK
LFI (Low Frequency Instrument). We found that the effect of destriping on a
pure sky signal is minimal and requires no correction. Instead we found an
effect related to the distribution of detector pointings, which affects the
high multipole part of the power spectrum. We correct for this by subtracting a
``signal bias'' estimated by MC simulations. We also give analytical estimates
for this signal bias. Our method is fast and accurate enough (the estimator is
un-biased and errors are close to theoretical expectations for maximal
accuracy) to estimate the CMB angular power spectra for current and future CMB
space missions. This study is related to PLANCK LFI activities.Comment: 16 pages, 23 figures, submitted to MNRA
A maximum likelihood approach to the destriping technique
The destriping technique is a viable tool for removing different kinds of
systematic effects in CMB related experiments. It has already been proven to
work for gain instabilities that produce the so-called 1/f noise and periodic
fluctuations due to e.g. thermal instability. Both effects when coupled with
the observing strategy result in stripes on the observed sky region. Here we
present a maximum-likelihood approach to this type of technique and provide
also a useful generalization. As a working case we consider a data set similar
to what the Planck satellite will produce in its Low Frequency Instrument
(LFI). We compare our method to those presented in the literature and find some
improvement in performance. Our approach is also more general and allows for
different base functions to be used when fitting the systematic effect under
consideration. We study the effect of increasing the number of these base
functions on the quality of signal cleaning and reconstruction. This study is
related to Planck LFI activities.Comment: Revised version, accepted by A&A, 12 pages, 14 figure
GAMBARAN LITERASI KESEHATAN TENTANG PERILAKU HIDUP BERSIH DAN SEHAT DI SEKOLAH PADA PESERTA DIDIK SMA ADVENT UNKLAB AIRMADIDI
Penelitian ini bertujuan untuk mengetahui gambaran literasi kesehatan tentang perilaku hidup bersih dan sehat di sekolah pada siswa SMA Advent UNKLAB Airmadidi. Penelitian ini akan dilakukan di SMA Advent UNKLAB Airmadidi, kelurahan Airmadidi Bawah, Kecamatan Airmadidi, Kabupaten Minahasa Utara. Penelitian ini akan dilaksanakan pada bulan Maret â Mei 2023.Jumlah populasi pada penelitian ini adalah 271 orang dan jumlah sampelnya dihitung menggunakan rumus Lemeshow adalah didapat sebanyak 82 orang.Penelitian ini menggunakan desain penelitian deskriptif kuantitatif dan teknik probability sampling.Analisis data dalam penelitian ini menggunakan analisis univariat.Instrumen yang digunakan dalam penelitian ini berupa karakteristik responden, kuisioner HLQ, laptop, printer, software statistik dan alat tulis menulis.Variabel pada penelitian ini yaitu Literasi Kesehatan tentang Perilaku Hidup Bersih dan Sehat pada peserta didik SMA Advent UNKLAB Airmadidi berdasarkan akses informasi yang di peroleh. Hasil penelitian menunjukkan bahwa data responden dengan literasi kesehatan yang baik ini sebanyak 59,8% sedangkan responden dengan literasi kesehatan yang tidak memadai terdapat 40,2%. Kesimpulan dari penelitian ini adalah bahwa gambaran literasi kesehatan pada siswa SMA Advent Airmadidi di UNKLAB sudah cukup atau dapat dikatakan baik berdasarkan data yang diperoleh dari kerja lapangan. Penerapan perilaku hidup bersih dan sehat di sekolah termasuk dalam perilaku baik. Fasilitas yang disediakan di sekolah juga cukup memadai bagi siswa untuk menerapkan perilaku hidup bersih dan sehat di sekolah
Factors Related to the Role of Community Figure in Tuberculosis Disease Prevention Measures in the Community Health Centers Tuminting Working Area Manado City
The Planck-LFI instrument: analysis of the 1/f noise and implications for the scanning strategy
We study the impact of the 1/f noise on the PLANCK Low Frequency Instrument
(LFI) osbervations (Mandolesi et al 1998) and describe a simple method for
removing striping effects from the maps for a number of different scanning
stategies. A configuration with an angle between telescope optical axis and
spin-axis just less than 90 degrees (namely 85 degress) shows good destriping
efficiency for all receivers in the focal plane, with residual noise
degradation < 1-2 %. In this configuration, the full sky coverage can be
achieved for each channel separately with a 5 degrees spin-axis precession to
maintain a constant solar aspect angle.Comment: submitted to Astronomy and Astrophysics, 12 pages, 15 PostSript
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Class II treatment by palatal miniscrew-system appliance: A case report
This case shows that using a rapid palatal expander (RPE) and then a pendulum appliance anchored to palatal miniscrews is an option for improving treatment management in a noncompliant patient requiring maxillary expansion and molar distalization in the late mixed dentition. First, an RPE was used to expand the maxillary arch. Then, a modified pendulum appliance was used to distalize the maxillary first permanent molars. Optimal positioning of two palatal miniscrews enabled both appliances to be supported by skeletal anchorage. Treatment was finished using multibracket fixed appliances, and after 2 years, skeletal Class I as well as dental Class I canine and molar relationships were achieved
Development of microwave superconducting microresonators for neutrino mass measurement in the HOLMES framework
The European Research Council has recently funded HOLMES, a project with the
aim of performing a calorimetric measurement of the electron neutrino mass
measuring the energy released in the electron capture decay of 163Ho. The
baseline for HOLMES are microcalorimeters coupled to Transition Edge Sensors
(TESs) read out with rf-SQUIDs, for microwave multiplexing purposes. A
promising alternative solution is based on superconducting microwave
resonators, that have undergone rapid development in the last decade. These
detectors, called Microwave Kinetic Inductance Detectors (MKIDs), are
inherently multiplexed in the frequency domain and suitable for even
larger-scale pixel arrays, with theoretical high energy resolution and fast
response. The aim of our activity is to develop arrays of microresonator
detectors for X-ray spectroscopy and suitable for the calorimetric measurement
of the energy spectra of 163Ho. Superconductive multilayer films composed by a
sequence of pure Titanium and stoichiometric TiN layers show many ideal
properties for MKIDs, such as low loss, large sheet resistance, large kinetic
inductance, and tunable critical temperature . We developed Ti/TiN
multilayer microresonators with within the range from 70 mK to 4.5 K and
with good uniformity. In this contribution we present the design solutions
adopted, the fabrication processes and the characterization results
Extracting cosmic microwave background polarisation from satellite astrophysical maps
We present the application of the Fast Independent Component Analysis
({\ica}) technique for blind component separation to polarized astrophysical
emission. We study how the Cosmic Microwave Background (CMB) polarized signal,
consisting of and modes, can be extracted from maps affected by
substantial contamination from diffuse Galactic foreground emission and
instrumental noise. {We implement Monte Carlo chains varying the CMB and noise
realizations in order to asses the average capabilities of the algorithm and
their variance.} We perform the analysis of all sky maps simulated according to
the {\sc Planck} satellite capabilities, modelling the sky signal as a
superposition of the CMB and of the existing simulated polarization templates
of Galactic synchrotron. Our results indicate that the angular power spectrum
of CMB -mode can be recovered on all scales up to ,
corresponding to the fourth acoustic oscillation, while the -mode power
spectrum can be detected, up to its turnover at , if the ratio
of tensor to scalar contributions to the temperature quadrupole exceeds 30%.
The power spectrum of the cross correlation between total intensity and
polarization, , can be recovered up to , corresponding to
the seventh acoustic oscillation.Comment: 20 pages, MNRAS in pres
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