223 research outputs found
Antibiotic Prescribing Practices of Filipino Dentists
There are reports that dentists overprescribe antibiotics which may contribute to antibiotic resistance. This is an exploratory study on antibiotic prescribing practices of Filipino dentists using an online platform to form a basis for antimicrobial stewardship policy for dentists. A link to an online questionnaire using Survey Monkey was posted in a Closed Group Facebook account of Filipino dentists. Two hundred thirty (230) dentists participated. Data was analyzed by Survey Monkey. Amoxicillin is the first choice of antibiotics(71.18%), andclindamycin is the second (57.27%). Most respondents follow the indications for antibiotic therapy, however, some will prescribe antibiotics for conditions without indications. For dental procedures, 88.99% will prescribe for periodontal surgery, 75.45% for endodontic surgery, 68.3% for extraction of a tooth with chronic infection, 87.17% for third molar surgery, 26.7% for routine endodontics, and 23.56% for periodontal treatment without surgery. Not all of the respondents would prescribe for medical conditions that require antibiotic prophylaxis, while 60.36% will prescribe when in doubt in diagnosis, under time pressure (25.68%), and 48.67% considers patient preference. Only 10.48% of the respondents are very familiar with antimicrobial stewardship, while majority (69.74%) have not attended a lecture for antimicrobial stewardship for dentists.There is inappropriate antibiotic prescribing of participants on certain dental diseases, procedures, and medical conditions. Most respondents are not very familiar and have not attended a lecture on antimicrobial stewardship for specifically for dentists
Yttrium doped Barium cerate and Zirconate heterostructures: deposition and electrochemical characterization
Epitaxial heterostructures consisting of an yttrium doped barium
cerate (BCY) layer sandwiched between two yttrium doped barium
zirconate (BZY) thin layers have been deposited on insulating
(001) MgO substrates by pulsed laser deposition. The first BZY
layer was aimed at improving the lattice match with the MgO
substrate, the second at protecting the BCY layer. Ionic
conductivity has been studied in the 300 – 600°C temperature
range as a function of the BCY thickness. Due to the absence of
blocking grain boundaries, heterostructures showed a conductivity
larger than that of BCY pellets sintered under optimized
conditions
A Dynamical Analysis of the Dust Tail of Comet C/1995 O1 (Hale-Bopp) at High Heliocentric Distances
Comet C/1995 O1 (Hale-Bopp) has provided an unprecedented opportunity to
observe a bright comet over a wide range of heliocentric distances. We present
here Spitzer Space Telescope observations of Hale-Bopp from 2005 and 2008 that
show a distinct coma and tail, the presence of which is uncommon given its
large heliocentric distance (21.6 AU and 27.2 AU, respectively). The morphology
of the dust is compared to dynamical models to understand the activity of the
comet. Our analysis shows that the shape of Hale-Bopp's dust tail in these
images cannot be explained using the usual Finson-Probstein (solar gravity +
solar radiation pressure) dynamical model. Several alternative explanations are
explored. The analysis suggests that the most likely cause of the discrepancy
is that the dust is being charged by the solar wind, then being affected by the
interplanetary magnetic field via the Lorentz force. Though this effect has
been explored previously, if correct, this seems to be the first time that the
Lorentz force has been required to model a cometary dust tail. The analysis
also suggests that Hale-Bopp was actively emitting particles when these images
were taken, and the tail characteristics changed between observations.Comment: 23 pages, 10 figures. Accepted to Icarus on 17 March 201
Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere
Although solar-analog stars have been studied extensively over the past few
decades, most of these studies have focused on visible wavelengths, especially
those identifying solar-analog stars to be used as calibration tools for
observations. As a result, there is a dearth of well-characterized solar
analogs for observations in the near-infrared, a wavelength range important for
studying solar system objects. We present 184 stars selected based on
solar-like spectral type and V-J and V-K colors whose spectra we have observed
in the 0.8-4.2 micron range for calibrating our asteroid observations. Each
star has been classified into one of three ranks based on spectral resemblance
to vetted solar analogs. Of our set of 184 stars, we report 145 as reliable
solar-analog stars, 21 as solar analogs usable after spectral corrections with
low-order polynomial fitting, and 18 as unsuitable for use as calibration
standards owing to spectral shape, variability, or features at low to medium
resolution. We conclude that all but 5 of our candidates are reliable solar
analogs in the longer wavelength range from 2.5 to 4.2 microns. The average
colors of the stars classified as reliable or usable solar analogs are
V-J=1.148, V-H=1.418, and V-K=1.491, with the entire set being distributed
fairly uniformly in R.A. across the sky between -27 and +67 degrees in decl.Comment: 19 pages, 8 figures, 2 table
Assessment of Microwave/UV/O3 in the Photo-Catalytic Degradation of Bromothymol Blue in Aqueous Nano TiO2 Particles Dispersions
In this study, a microwave/UV/TiO2/ozone/H2O2 hybrid process system, in which various techniques that have been used for water treatment are combined, is evaluated to develop an advanced technology to treat non-biodegradable water pollutants efficiently. In particular, the objective of this study is to develop a novel advanced oxidation process that overcomes the limitations of existing single-process water treatment methods by adding microwave irradiation to maximize the formation of active intermediate products, e.g., OH radicals, with the aid of UV irradiation by microwave discharge electrodeless lamp, photo-catalysts, and auxiliary oxidants. The results of photo-catalytic degradation of BTB showed that the decomposition rate increased with the TiO2 particle dosages and microwave intensity. When an auxiliary oxidant such as ozone or hydrogen peroxide was added to the microwave-assisted photo-catalysis, however, a synergy effect that enhanced the reaction rate considerably was observed
Thermophysical Characterization of Potential Spacecraft Target (101955) 1999 RQ36
We report on thermal emission measurements of 1999 RQ36 from Spitzer. The derived size is in agreement with radar measurements, and we find a moderately high thermal inertia and homogeneous surface properties
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Day-ahead industrial load forecasting for electric RTG cranes
Given the increase in international trading and the significant energy and environmental challenges in ports around the world, there is a need for a greater understanding of the energy demand behaviour at ports. The move towards electrified rubber-tyred gantry (RTG) cranes is expected to reduce gas emissions and increase energy savings compared to diesel RTG cranes but it will increase electrical energy demand. Electrical load forecasting is a key tool for understanding the energy demand which is usually applied to data with strong regularities and seasonal patterns. However, the highly volatile and stochastic behaviour of the RTG crane demand creates a substantial prediction challenge. This paper is one of the first extensive investigations into short term load forecasts for electrified RTG crane demand. Options for model inputs are investigated depending on extensive data and correlation analysis. The effect of estimation accuracy of exogenous variables on the forecast accuracy is investigated as well. The models are tested on two different RTG crane data sets that were collected from the Port of Felixstowe in the UK. The results reveal the effectiveness of the forecast models when the estimation of the number of crane moves and container gross weight are accurate
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