54 research outputs found
Spin-Orbit Coupling and Anomalous Angular-Dependent Magnetoresistance in the Quantum Transport Regime of PbS
We measured magnetotransport properties of PbS single crystals which exhibit
the quantum linear magnetoresistance (MR) as well as the static skin effect
that creates a surface layer of additional conductivity. The Shubnikov-de Haas
oscillations in the longitudinal MR signify the peculiar role of spin-orbit
coupling. In the angular-dependent MR, sharp peaks are observed when the
magnetic field is slightly inclined from the longitudinal configuration, which
is totally unexpected for a system with nearly spherical Fermi surface and
points to an intricate interplay between the spin-orbit coupling and the
conducting surface layer in the quantum transport regime.Comment: 5 pages, 5 figure
3D Structure of Microwave Sources from Solar Rotation Stereoscopy vs Magnetic Extrapolations
We use rotation stereoscopy to estimate the height of a steady-state solar
feature relative to the photosphere, based on its apparent motion in the image
plane recorded over several days of observation. The stereoscopy algorithm is
adapted to work with either one- or two-dimensional data (i.e. from images or
from observations that record the projected position of the source along an
arbitrary axis). The accuracy of the algorithm is tested on simulated data, and
then the algorithm is used to estimate the coronal radio source heights
associated with the active region NOAA 10956, based on multifrequency imaging
data over 7 days from the Siberian Solar Radio Telescope near 5.7 GHz, the
Nobeyama Radio Heliograph at 17 GHz, as well as one-dimensional scans at
multiple frequencies spanning the 5.98--15.95 GHz frequency range from the
RATAN-600 instrument. The gyroresonance emission mechanism, which is sensitive
to the coronal magnetic field strength, is applied to convert the estimated
radio source heights at various frequencies, h(f), to information about
magnetic field vs. height B(h), and the results are compared to a magnetic
field extrapolation derived from photospheric magnetic field observations
obtained by Hinode and MDI. We found that the gyroresonant emission comes from
the heights exceeding location of the third gyrolayer irrespectively on the
magnetic extrapolation method; implications of this finding for the coronal
magnetography and coronal plasma physics are discussed.Comment: 26 pages, 13 figures, ApJ accepte
Prevention and management of intra-operative pain during caesarean section under neuraxial anaesthesia: a technical and interpersonal approach
A woman who experiences pain during caesarean section under neuraxial anaesthesia is at risk of adverse psychological sequelae. Litigation arising from pain during caesarean section under neuraxial anaesthesia has replaced accidental awareness under general anaesthesia as the most common successful medicolegal claim against obstetric anaesthetists. Generic guidelines on caesarean section exist, but they do not provide specific recommendations for this area of anaesthetic practice. This guidance aims to offer pragmatic advice to support anaesthetists in caring for women during caesarean section. It emphasises the importance of nonâtechnical skills, offers advice on best practice and aims to encourage standardisation. The guidance results from a collaborative effort by anaesthetists, psychologists and patients and has been developed to support clinicians and promote standardisation of practice in this area
Tomographic 3D-Modeling of the Solar Corona with FASR
The "Frequency-Agile Solar Radiotelescope" (FASR) litteraly opens up a new
dimension in addition to the 3D Euclidian geometry: the frequency dimension.
The 3D geometry is degenerated to 2D in all images from astronomical
telescopes, but the additional frequency dimension allows us to retrieve the
missing third dimension by means of physical modeling. We call this type of 3D
reconstruction "Frequency Tomography". In this study we simulate a realistic 3D
model of an active region, composed of 500 coronal loops with the 3D geometry
[x(s),y(s),z(s)] constrained by magnetic field extrapolations and the physical
parameters of the density n_e(s) and temperature T_e(s) given by hydrostatic
solutions. We simulate a series of 20 radio images in a frequency range of
f=0.1-10 GHz, anticipating the capabilities of FASR, and investigate what
physical information can be retrieved from such a dataset. We discuss also
forward-modeling of the chromospheric and Quiet Sun density and temperature
structure, another primary goal of future FASR science.Comment: 10 Figure
PROFIL WISATAWAN MUSEUM RADYA PUSTAKA SURAKARTA
Anggit Margaret, C9407031 2011. Profil Wisatawan Museum
Radya Pustaka Surakarta. Program Studi Diploma III Usaha Perjalanan
Wisata Fakultas Sastra Dan Seni Rupa Universitas Sebelas Maret Surakarta.
Penelitian tugas akhir ini mengkaji tentang Profil Wisatawan di
Museum Radya Pustaka Surakarta. Tujuan dari penelitian ini adalah untuk
mengetahui dari daerah mana saja wisatawan yang berkunjung ke Museum
Radya Pustaka, bagaimana ciri-ciri wisatawan yang berkunjung ke Museum
Radya Pustaka serta harapan-harapan yang diinginkan wisatawan terhadap
Museum Radya Pustaka.
Penelitian dilakukan dengan metode kualitatif. Pengumpulan data
dilakukan melalui wawancara dengan narasumber wisatawan yang berkujung
di Museum Radya Pustaka Surakarta tempat penulis melakukan penelitian,
serta studi pustaka dan studi dokumen guna menambah sumber data.
Hasil penelitian menunjukkan bahwa (1) Sebagian besar wisatawan
yang datang berasal dari Semarang sebesar 32%. (2) Mayoritas wisatawan
yang berkunjung ke Museum Radya Pustaka berusia antara 17-25 tahun dan
kebanyakan dari mereka adalah pelajar atau mahasiswa dengan prosentase
52%. (3) Sebagian besar wisatawan yang datang ke Museum Radya Pustaka
adalah bertujuan untuk melakukan penelitian yaitu sebesar 34%. (4) Harapan
wisatawan yang berkunjung terhadap kelangsungan Museum Radya Pustaka
sebagian besar adalah agar ditingkatkan lagi pengelolaan dan keamanan
museum, agar kejadian hilangnya benda-benda koleksi museum tidak terulang
lagi dikemudian hari.
Kesimpulan dari hasil penelitian ini bahwa wisatawan yang berkujung
ke Museum Radya Pustaka Surakarta mayoritas berasal dari Semarang,
mayoritas berusia 17-25 tahun dan kebanyakan dari mereka adalah berprofesi
sebagai pelajar dan mahasiswa. Kebanyakan wisatawan yang datang bertujuan
untuk melakukan penelitian, serta harapan wisatawan terhadap Museum
Radya Pustaka adalah supaya lebih ditingkatkan lagi pengelolaan dan
keamanan museum
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