Although several studies have addressed the relationship between systemic bone mineral status and the severity of periodontitis, there is little knowledge of the relationship between periodontal ...disease and locally detected bone mineral density. The aim of this study was to compare the mandibular bone mineral density of patients with chronic periodontitis with that of periodontally healthy subjects.
48 systemically healthy subjects were included in the study and underwent a periodontal examination to determine their status. 24 subjects were periodontally healthy and the other 24 had moderate or severe chronic periodontitis. The mandibular bone mineral density of the subjects was determined by dual energy X-ray absorptiometry. The region of interest on the body of the mandible was independently determined on the dual energy absorptiometry radiographs, and a computer calculated the bone mineral density of these regions.
The mandibular bone mineral density of the subjects with periodontitis was significantly lower than that of the periodontally healthy subjects (p < 0.01). There were significant negative correlations between the mandibular bone mineral density values and parameters related to the amount of periodontal destruction.
Low bone mineral density in the jaw may be associated with chronic periodontitis.
A
bstract
We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model ...long-lived particles, such as dark photons, heavy neutral leptons, axion-like particles, and dark Higgs bosons. The proposed subsystem is called
FACET
for
F
orward-
A
perture
C
MS
E
x
T
ension, and will be sensitive to any particles that can penetrate at least 50 m of magnetized iron and decay in an 18 m long, 1 m diameter vacuum pipe. The decay products will be measured in detectors using identical technology to the planned CMS Phase-2 upgrade.
The azimuthal correlation,
Δ
ϕ
12
, of high transverse momentum jets in pp collisions at
s
=
13
TeV is studied by applying PB-TMD distributions to NLO calculations via MCatNLO together with the ...PB-TMD parton shower. A very good description of the cross section as a function of
Δ
ϕ
12
is observed. In the back-to-back region of
Δ
ϕ
12
→
π
, a very good agreement is observed with the PB-TMD Set 2 distributions while significant deviations are obtained with the PB-TMD Set 1 distributions. Set 1 uses the evolution scale while Set 2 uses transverse momentum as an argument in
α
s
, and the above observation therefore confirms the importance of an appropriate soft-gluon coupling in angular ordered parton evolution. The total uncertainties of the predictions are dominated by the scale uncertainties of the matrix element, while the uncertainties coming from the PB-TMDs and the corresponding PB-TMD shower are very small. The
Δ
ϕ
12
measurements are also compared with predictions using MCatNLO together
Pythia
8, illustrating the importance of details of the parton shower evolution.
Jets which are the signatures of quarks and gluons in the detector can be described by Quantum Chromodynamics (QCD) in terms of parton-parton scattering. Jets are abundantly produced at the LHC’s ...high energy scales. Measurements of inclusive jets, dijets and multijets can be used to test perturbative QCD predictions and to constrain parton distribution functions (PDF), as well as to measure the strong coupling constant αS . The measurements use the samples of proton-proton collisions collected with the CMS detector at the LHC at various center-of-mass energies of 7, 8 and 13 TeV.
Measurements of luminosity are required to be exceedingly accurate for the new upcoming era of the LHC with higher energies and a more complex structure of the beam (HL-LHC). A new device is being ...developed for the CMS experiment to fulfill demands of being stand-alone and precise. The paper describes the design, main components and physics behind the new quartz fiber based luminometer (QFL). Via simulations of a single quartz fiber, we were able to calculate an average number of photons reaching the end of the fiber after a single particle hit.
Background : Many authors have claimed that hyperthyroidism protects
against thyroid cancer and believed that the incidence of malignancy is
lower in patients with toxic multinodular goiter (TMG) ...than in those
with non-toxic multinodular goiter. But in recent studies, it was
reported that the incidence of malignancy with TMG is not as low as
previously thought. Aim : To compare the thyroid cancer incidence in
patients with toxic and non-toxic multinodular goiter. Settings and
Design : Histology reports of patients treated surgically with a
preoperative diagnosis of toxic and non-toxic multinodular goiter were
reviewed to identify the thyroid cancer incidence. Patients having a
history of neck irradiation or radioactive iodine therapy were excluded
from the study. Materials and Methods : We reviewed 294 patients
operated between 2001-2005 from toxic and non-toxic multinodular
goiter. One hundred and twenty-four of them were toxic and 170 were
non-toxic. Hyperthyroidism was diagnosed by elevated
tri-iodothyroinine/thyroxine ratios and low thyroid-stimulating hormone
with clinical signs and symptoms. All patients were evaluated with
ultrasonography and scintigraphy and fine needle aspiration biopsy.
Statistical Analysis Used : Significance of the various parameters was
calculated by using ANOVA test. Results : The incidence of malignancy
was 9% in the toxic and 10.58% in the non-toxic multinodular goiter
group. Any significant difference in the incidence of cancer and tumor
size between the two groups could not be detected. Conclusions : The
incidence of malignancy in toxic multinodular goiter is not very low as
thought earlier and is nearly the same in non-toxic multinodular
goiter.
We present performance studies of a full-length prototype for the CASTOR quartz-tungsten sampling calorimeter, installed in the very forward region of the CMS experiment at the LHC. The response ...linearity and energy resolution, the uniformity, as well as the showers’ spatial properties in the prototype have been studied with electrons, pions and muons of various energies. A special study was also carried out for testing the light-output with a 90-degree cut of the quartz plates of the calorimeter. The data were taken during the CASTOR test beam at CERN/SPS in 2007.
α-MnO2 has attracted specific interest as one of the most promising candidates for the Oxygen Evolution Reaction (OER) electrocatalyst owing to its low-cost, non-toxicity, earth-abundancy and high ...activity/stability properties. Long-term operating stability and activity of candidate electrocatalysts are important parameters for evaluating their commercial potential. However, long-term stability and activity parameters in electrocatalysis depend on various chemical factors (such as pH, composition and oxidation state of catalyst, etc.) and physical factors (such as particle size, morphology, conductivity, etc.). It is extremely difficult to evaluate and estimate which factor dominates the electrocatalytic stability, because electrocatalytic reactions occur via multistep processes, which contain chemical, electrochemical and mechanical treatments. In addition to advanced research methods that can provide accurate information about electrochemical systems, it is essential to develop data analysis methods in order to make significant progress. A new and powerful systematic approach is needed to determine the long-term stability of active and stable electrocatalysts. In this study, in order to evaluate and estimate to long term stability and activation loss of electrocatalysts, we propose data processing approach using a typical electrochemical measurement. A scientific software tool based on C++; ROOT, was used for the analysis and visualisation of data processing. Various statistical and mathematical functions are well integrated into the framework and this allows to operate data with a few simple commands.
Display omitted
•α-MnO2 nanowires were synthesized by microwave-assisted hydrothermal method.•The long-term stability and activity of OER electrocatalysts can be analyzed by using data processing approach.•Data processing method can be used to estimate activity loss and performance of electrocatalysts.
Abstract
Background. The use of drains in the treatment of syringomyelia has a simple and immediate appeal. Syringopleural shunting in syringomyelia has produced good short-term results, but limited ...information is available on long-term effects. We analyzed the complications and long-term outcomes after syringopleural shunting for syringomyelia. Clinical material and methods. Fourthy-four patients with large-sized syringomyelia underwent syringopleural shunting because of spinal cord compression between 1992 and 2010 in our clinic. Thirty-two patients had Chiari malformation type I (Group B), and 12 patients were associated with primary parenchymal cavitations (Group A). Their ages ranged from 14 to 71 years. Both craniovertebral decompression and syringopleural shunting were performed on 21 patients, whereas only syringopleural shunting was performed on another 21 patients. Results. The follow-up period ranged from 1 year to 17 years (mean: 9.1 years). There was no operative mortality. Early postoperative MRI revealed that syringes of 43 patients had collapsed. There were 9 (20.5%) minor complications in 9 patients, including temporary neurological deficits (6), respiratory distress (2) and headache (1). Seven (15.9%) serious complications permanent neurological deficit (1), shunt migration (2), shunt misplacement (1), spinal instability (1), tethering (1), CSF over drainage (1) were seen in five patients. Four of them were treated with a secondary operation. Three patients (3/9; 33.3%) who were treated by syringopleural shunt alone (Group B2) required craniovertebral decompression, although the shunt was functional. During long-term follow-up, three patients stabilized, five patients (11.3%) developed a worse neurological condition, and two of these patients died 10 and 7 years after surgery. Of all patients, 88.6% showed significant clinical improvement. Conclusions. Although there were complications and failures, syringopleural shunting produced satisfactory results at long-term follow-up.
We investigated the darkening of two high
OH
-
content quartz fibres irradiated with 24
GeV protons at the Cern PS facility IRRAD. The two tested fibres have a 0.6
mm quartz core diameter, one with ...hard plastic cladding (qp) and the other with quartz cladding (qq). These fibres were exposed at about 1.25
Grad in 3 weeks. The fibres became opaque below 380
nm and in the range 580–650
nm. The darkening under irradiation and damage recovery after irradiation as a function of dose and time are similar to what we observed with electrons. The typical attenuation at 455
nm are
1.44
±
0.22
and
2.20
±
0.15
dB
/
m
at 100
Mrad for qp and qq fibres, respectively. The maximum damage recovery is also observed near this wavelength.
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