15,189 research outputs found
Quantum Phase Transition, O(3) Universality Class and Phase Diagram of Spin-1/2 Heisenberg Antiferromagnet on Distorted Honeycomb Lattice: A Tensor Renormalization Group Study
The spin-1/2 Heisenberg antiferromagnet on the distorted honeycomb (DHC)
lattice is studied by means of the tensor renormalization group method. It is
unveiled that the system has a quantum phase transition of second-order between
the gapped quantum dimer phase and a collinear Neel phase at the critical point
of coupling ratio \alpha_{c} = 0.54, where the quantum critical exponents \nu =
0.69(2) and \gamma = 1.363(8) are obtained. The quantum criticality is found to
fall into the O(3) universality class. A ground-state phase diagram in the
field-coupling ratio plane is proposed, where the phases such as the dimer,
semi-classical Neel, and polarized phases are identified. A link between the
present spin system to the boson Hubbard model on the DHC lattice is also
discussed.Comment: 6 pages, 5 figures, published in Phys. Rev.
Pemanfaatan dan Efektivitas Fasilitas Puskesmas (Kasus: Kecamatan Pati dan Dukuhseti)
Permasalahan sebagai konsekuensi dari perkembangan kota adalah meningkatnya aktivitas penduduk sehingga kebutuhan akan fasilitas sebagai pendukung aktivitas penduduk akan meningkat pula. Fasilitas sosial yang merupakan bagian dari fasilitas kota memegang peranan penting bagi pertumbuhan aktivitas kota, salah satunya fasilitas kesehatan. Bagi penduduk di perkotaan dan perdesaan sangatlah membutuhkan sebuah pelayanan seperti pelayanan kesehatan yang memadai. Penelitian ini bertujuan untuk mendeskripsikan pemanfaatan fasilitas puskesmas dan mengidentifikasi efektivitas pemanfaatan fasilitas puskesmas di Kecamatan Pati dan Dukuhseti. Metode yang digunakan pada penelitian ini adalah metode survei. Jumlah sampel yang digunakan sebanyak 60 responden. Teknik analisis data yang digunakan2pada penelitian ini adalah teknik deskriptif analitis dengan menggunakan analisis tabulasi silang.Hasil penelitian menunjukkan bahwa pemanfaatan fasilitas puskesmas di Kecamatan Pati dan Dukuhseti menunjukkan adanya perbedaan dari sisi keruangan yaitu antara daerah perkotaan (Kecamatan Pati) dan daerah perdesaan pesisir (Kecamatan Dukuhseti). Perbedaan pemanfaatan dipengaruhi oleh ketersediaan fasilitas pelayanan di daerah masing-masing dan aspek sosial ekonomi pemanfaat (pasien). Efektivitas fasilitas pelayanan kesehatan puskesmas yang terjadi di Kecamatan Pati dan Dukuhseti menunjukkan adanya perbedaan terkait dengan efektivitas lokasi berdasarkan standar jarak ideal untuk mencapai fasilitas sementara dari sisi kualitas pelayanan sudah cukup efektif
Single-bubble and multi-bubble cavitation in water triggered by laser-driven focusing shock waves
In this study a single laser pulse spatially shaped into a ring is focused
into a thin water layer, creating an annular cavitation bubble and cylindrical
shock waves: an outer shock that diverges away from the excitation laser ring
and an inner shock that focuses towards the center. A few nanoseconds after the
converging shock reaches the focus and diverges away from the center, a single
bubble nucleates at the center. The inner diverging shock then reaches the
surface of the annular laser-induced bubble and reflects at the boundary,
initiating nucleation of a tertiary bubble cloud. In the present experiments,
we have performed time-resolved imaging of shock propagation and bubble wall
motion. Our experimental observations of single-bubble cavitation and collapse
and appearance of ring-shaped bubble clouds are consistent with our numerical
simulations that solve a one dimensional Euler equation in cylindrical
coordinates. The numerical results agree qualitatively with the experimental
observations of the appearance and growth of bubble clouds at the smallest
laser excitation rings. Our technique of shock-driven bubble cavitation opens
novel perspectives for the investigation of shock-induced single-bubble or
multi-bubble cavitation phenomena in thin liquids
Monetering of Infectious Diseases in Katsina and Daura Zones of Katsina State: A Clustering Analysis
In this paper, data of infectious diseases were collected from the two senatorial zones of Katsina state, and analyzed using cluster analysis, a multivariate technique. This necessitated a partition of the set of diseases into groups such that the diseases with similar degree of prevalence were identified. The result of the cluster formation shows that Malaria is more prevalent in all of the two zones, followed by Cholera and Typhoid fever using the Single Linkage and Centroid methods. The Complete Linkage and Ward methods showed that Malaria is the most prevalent followed by Typhoid fever and Cholera in Katsina zone, while in Daura zone Typhoid fever is more prevalent followed by Malaria and Cholera. The number of clusters tends to vary from one zone to another. This is achieved by using Chi-square test for independence. The study concludes that the use of clustering methods provides a suitable tool for assessing the level of infections of the disease
Narrow Band Chandra X-ray Analysis of Supernova Remnant 3C391
We present the narrow-band and the equivalent width (EW) images of the
thermal composite supernova remnant (SNR) 3C391 for the X-ray emission lines of
elements Mg, Si, & S using the Chandra ACIS Observational data. These EW images
reveal the spatial distribution of the emission of the metal species Mg, Si, &
S in the remnant. They have clumpy structure similar to that seen from the
broadband diffuse emission, suggesting that they are largely of interstellar
origin. We find an interesting finger-like feature protruding outside the
southwestern radio border of the remnant, which is somewhat similar to the
jet-like Si structure found in the famous SNR Cas A. This feature may possibly
be the debris of the jet of ejecta which implies an asymmetrical supernova
explosion of a massive progenitor star.Comment: 9 pages, 4 embedded figures, Chinese Journal of Astronomy and
Astrophysics (ChJAA), in pres
The Radio-to-Submm Spectral Index as a Redshift Indicator
We present models of the 1.4 GHz to 350 GHz spectral index, alpha(350/1.4),
for starburst galaxies as a function of redshift. The models include a
semi-analytic formulation, based on the well quantified radio-to-far infrared
correlation for low redshift star forming galaxies, and an empirical
formulation, based on the observed spectrum of the starburst galaxies M82 and
Arp 220. We compare the models to the observed values of alpha(350/1.4) for
starburst galaxies at low and high redshift. We find reasonable agreement
between the models and the observations, and in particular, that an observed
spectral index of alpha(350/1.4) > +0.5 indicates that the target source is
likely to be at high redshift, z > 1. The evolution of alpha(350/1.4) with
redshift is mainly due to the very steep rise in the Raleigh-Jeans portion of
the thermal dust spectrum shifting into the 350 GHz band with increasing
redshift. We also discuss situations where this relationship could be violated.
We then apply our models to examine the putative identifications of submm
sources in the Hubble Deep Field, and conclude that the submm sources reported
by Hughes et al. are likely to be at high redshifts, z > 1.5.Comment: standard LATEX file plus 1 postscript figure. Added references and
revised figure. second figure revision. Final Proof version. to appear in
Astrophysical Journal Letter
Impact of atrial contraction on diagnosis of pre- versus post-capillary pulmonary hypertension
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Tet3 regulates synaptic transmission and homeostatic plasticity via DNA oxidation and repair.
Contrary to the long-held belief that DNA methylation of terminally differentiated cells is permanent and essentially immutable, post-mitotic neurons exhibit extensive DNA demethylation. The cellular function of active DNA demethylation in neurons, however, remains largely unknown. Tet family proteins oxidize 5-methylcytosine to initiate active DNA demethylation through the base-excision repair (BER) pathway. We found that synaptic activity bi-directionally regulates neuronal Tet3 expression. Functionally, knockdown of Tet or inhibition of BER in hippocampal neurons elevated excitatory glutamatergic synaptic transmission, whereas overexpressing Tet3 or Tet1 catalytic domain decreased it. Furthermore, dysregulation of Tet3 signaling prevented homeostatic synaptic plasticity. Mechanistically, Tet3 dictated neuronal surface GluR1 levels. RNA-seq analyses further revealed a pivotal role of Tet3 in regulating gene expression in response to global synaptic activity changes. Thus, Tet3 serves as a synaptic activity sensor to epigenetically regulate fundamental properties and meta-plasticity of neurons via active DNA demethylation
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