1,360 research outputs found
The calculation of the heat required for wing thermal ice prevention in specified icing conditions
Enhancing Prostate Cancer Diagnosis with Deep Learning: A Study using mpMRI Segmentation and Classification
Prostate cancer (PCa) is a severe disease among men globally. It is important
to identify PCa early and make a precise diagnosis for effective treatment. For
PCa diagnosis, Multi-parametric magnetic resonance imaging (mpMRI) emerged as
an invaluable imaging modality that offers a precise anatomical view of the
prostate gland and its tissue structure. Deep learning (DL) models can enhance
existing clinical systems and improve patient care by locating regions of
interest for physicians. Recently, DL techniques have been employed to develop
a pipeline for segmenting and classifying different cancer types. These studies
show that DL can be used to increase diagnostic precision and give objective
results without variability. This work uses well-known DL models for the
classification and segmentation of mpMRI images to detect PCa. Our
implementation involves four pipelines; Semantic DeepSegNet with ResNet50,
DeepSegNet with recurrent neural network (RNN), U-Net with RNN, and U-Net with
a long short-term memory (LSTM). Each segmentation model is paired with a
different classifier to evaluate the performance using different metrics. The
results of our experiments show that the pipeline that uses the combination of
U-Net and the LSTM model outperforms all other combinations, excelling in both
segmentation and classification tasks.Comment: Accepted at CISCON-202
The study of initial permeability temperature dependences for LiTiZn ferrite ceramics
Results of obtaining and analyzing the temperature dependences of initial permeability of ferrite ceramics are presented in the paper. It was shown that the level of the defective state of ferrite ceramics can be obtained from the value of two parameters [alpha] and [beta] of the phenomenological expression describing the experimental dependences. The results showed that the main criterion of the defect state is the parameter [beta]/[alpha], which is related to the elastic stresses in the material. An indicator of the structure perfection is also the value of the maximum of the initial permeability near the Curie temperature
Tracking the momentum flux of a CME and quantifying its influence on geomagnetically induced currents at Earth
We investigate a CME propagating towards Earth on 29 March 2011. This event
is specifically chosen for its predominately northward directed magnetic field,
so that the influence from the momentum flux onto Earth can be isolated. We
focus our study on understanding how a small Earth-directed segment propagates.
Mass images are created from the white-light cameras onboard STEREO which are
also converted into mass height-time maps (mass J-maps). The mass tracks on
these J-maps correspond to the sheath region between the CME and its associated
shock front as detected by in situ measurements at L1. A time-series of mass
measurements from the STEREO COR-2A instrument are made along the Earth
propagation direction. Qualitatively, this mass time-series shows a remarkable
resemblance to the L1 in situ density series. The in situ measurements are used
as inputs into a 3D magnetospheric space weather simulation from CCMC. These
simulations display a sudden compression of the magnetosphere from the large
momentum flux at the leading edge of the CME and predictions are made for the
time-derivative of the magnetic field (dB/dt) on the ground. The predicted
dB/dt were then compared with observations from specific equatorially-located
ground stations and show notable similarity. This study of the momentum of a
CME from the Sun down to its influence on magnetic ground stations on Earth is
presented as preliminary proof of concept, such that future attempts may try to
use remote sensing to create density and velocity time-series as inputs to
magnetospheric simulations.Comment: Accepted for publication 8th March 2013. Submitted 18th Dec 2012. 19
Pages, 10 figures, 2 Appendice
The Calculation of the Heat Required for Wing Thermal Ice Prevention in Specified Icing Conditions
Flight tests were made in natural icing conditions with two 8-ft-chord heated airfoils of different sections. Measurements of meteorological variables conducive to ice formation were made simultaneously with the procurement of airfoil thermal data. The extent of knowledge on the meteorology of icing, the impingement of water drops on airfoil surfaces, and the processes of heat transfer and evaporation from a wetted airfoil surface have been increased to a point where the design of heated wings on a fundamental, wet-air basis now can be undertaken with reasonable certainty
Anisotropy of ultra-thin ferromagnetic films and the spin reorientation transition
The influence of uniaxial anisotropy and the dipole interaction on the
direction of the magnetization of ultra-thin ferromagnetic films in the
ground-state is studied. The ground-state energy can be expressed in terms of
anisotropy constants which are calculated in detail as function of the system
parameters and the film thickness. In particular non-collinear spin
arrangements are taken into account. Conditions for the appearance of a spin
reorientation transition are given and analytic results for the width of the
canted phase and its shift in applied magnetic fields associated with this
transition are derived.Comment: 6 pages, RevTeX
Determining If Sex Bias Exists in Human Surgical Clinical Research
Sex is a variable that is poorly controlled for in clinical research
Z topology and superconductivity from symmetry lowering of a 3D Dirac Metal AuPb
3D Dirac semi-metals (DSMs) are materials that have massless Dirac electrons
and exhibit exotic physical properties It has been suggested that structurally
distorting a DSM can create a Topological Insulator (TI), but this has not yet
been experimentally verified. Furthermore, quasiparticle excitations known as
Majorana Fermions have been theoretically proposed to exist in materials that
exhibit superconductivity and topological surface states. Here we show that the
cubic Laves phase AuPb has a bulk Dirac cone above 100 K that gaps out upon
cooling at a structural phase transition to create a topologically non trivial
phase that superconducts below 1.2 K. The nontrivial Z = -1 invariant in
the low temperature phase indicates that AuPb in its superconducting state
must have topological surface states. These characteristics make AuPb a
unique platform for studying the transition between bulk Dirac electrons and
topological surface states as well as studying the interaction of
superconductivity with topological surface states
Effect of fenugreek (Trigonella foenum-graecum) seed powder on lipid profile: A single blind placebo controlled study
Background: Dyslipidemia is one of the most prevalent risk factors contributing to atherosclerotic cardiovascular disease. Clinical trials have demonstrated that treatment of dyslipidemia reduces cardiovascular events. Fenugreek seed powder supplementation has lipid-lowering activity, but has not been studied extensively. In light of this, we undertook the present study at tertiary care hospital in Amravati, Maharashtra, with the aim of studying the effect of fenugreek seed powder on serum lipid profile in patients with dyslipidemia & to determine the adverse effects of it.
Methods: The study was a single blind placebo controlled study conducted on 60 patients with dyslipidemia from June 2022 to November 2022, after meeting inclusion and exclusion criteria.
Results: It was found significant decrease in serum total cholesterol (237.32 to 204.51mg/dl) p value 0.05, without any major side effects.
Conclusion: Fenugreek seed powder significantly lowers serum total cholesterol, LDL cholesterol and triglyceride levels in dyslipidemia patients, with no effect on serum HDL cholesterol levels. fenugreek seed powder supplementation considerably improves lipid Profile. Hence it could be well-thought-out as an effective lipid lowering nutritional supplement. Further high quality & large scale studies are needed to decisively establish the clinical efficacy of fenugreek seed powder
Archaeology of the Planned Location of the Toyota Motor Manufacturing Plant, San Antonio, Bexar County, Texas
From October 2002 to January 2004, the Center for Archaeological Research (CAR) of The University of Texas at San Antonio conducted archaeological investigations for the City of San Antonio in a 2,570.25-acre project area that is the future site of the San Antonio Toyota Motor Manufacturing Plant. The work was conducted under Texas Antiquities Permit No. 2982 with Dr. Steve A. Tomka, CAR Director, serving as Principal Investigator.
The project included the reconnaissance of over 500 acres of the project area, the excavation of 376 shovel tests, 250 mechanical auger borings, and 42 backhoe and Gradall trenches. The backhoe and Gradall trenches were dug for geoarchaeological investigations and in one instance to search for a presumed historic cemetery. Reassessment for National Register of Historic Places and State Archeological Landmark status was conducted for 16 previously documented archaeological sites (41BX125, 41BX349, 41BX652, 41BX653, 41BX654, 41BX655, 41BX656, 41BX657, 41BX658, 41BX659, 41BX660, 41BX661, 41BX662, 41BX676, 41BX681, and 41BX832) and five newly identified sites (41BX1571–41BX1575). Of the 21 sites examined during this project, 12 are prehistoric, seven are historic and two have both prehistoric and historic components. The prehistoric sites are lithic and burned rock scatters, possibly the remnants of campsites. Diagnostic artifacts found in previous surveys indicate Archaic and Late Prehistoric time frames. The historic sites present are farmstead-ranch complexes including residential structures and outbuildings. Also encountered were tenant farmer residences and a small brick kiln. The historic components are primarily late-nineteenth and early-twentieth-century, although original surveys noted early-nineteenth-century artifacts. All artifacts collected are curated at the Center for Archaeological Research laboratory facility
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