6,323 research outputs found
Synthesis and Characterization of Tungstite (WO3.H2O) Nanoleaves and Nanoribbons
An environmentally benign method capable of producing large quantities of
materials was used to synthesize tungstite (WO3.H2O) leaf-shaped nanoplatelets
(LNPs) and nanoribbons (NRs). These materials were simply obtained by aging of
colloidal solutions prepared by adding hydrochloric acid (HCl) to dilute sodium
tungstate solutions (Na2WO4.2H2O) at a temperature of 5-10oC. The aging medium
and the pH of the precursor solutions were also investigated. Crystallization
and growth occurred by Ostwald ripening during the aging of the colloidal
solutions at ambient temperature for 24 to 48hrs. When dispersed in water, the
LNPs and NRs take many days to settle, which is a clear advantage for some
applications (e.g., photocatalysis). The materials were characterized using
scanning and transmission electron microscopy, Raman and UV/Vis spectroscopies.
The current versus voltage characteristics of the tungstite NRs showed that the
material behaved as a Schottky diode with a breakdown electric field of
3.0x105V.m-1. They can also be heat treated at relatively low temperatures
(300oC) to form tungsten oxide (WO3) NRs and be used as photoanodes for
photoelectrochemical water splitting.Comment: 12 pages, 5 figure
Is There a Negative Thermal Expansion in Supported Metal Nanoparticles? An In-Situ X-ray Absorption Study Coupled with Neural Network Analysis
Interactions with their support, adsorbates and unique structural motifs are responsible for the many intriguing properties and potential applications of supported metal nanoparticles (NPs). At the same time, they complicate the interpretation of experimental data. In fact, the methods and approaches that work well for the ex situ analysis of bulk materials may be inaccurate or introduce artifacts in the in situ analysis of nanomaterials. Here we revisit the controversial topic of negative thermal expansion and anomalies in the Debye temperature reported for oxide-supported metal NPs. In situ X-ray absorption experimental data collected for Pt NPs in ultrahigh vacuum and an advanced data analysis approach based on an artificial neural network demonstrate that Pt NPs do not exhibit intrinsic negative thermal expansion. Similarly as for bulk materials, in the absence of adsorbates the bond lengths in metal NPs increase with temperature. The previously reported anomalies in particle size-dependent Debye temperatures can also be linked to the artifacts in the interpretation of conventional X-ray absorption data of disordered materials such as NPs
The use of pulse oximetry in evaluation of pulp vitality in immature permanent teeth
Background and aim: The current methods of pulp vitality assessment, either electric or thermal, are of limited use in children. Recently, traumatized and immature teeth may not respond to such methods and because such methods require subjective responses, it may not provide accurate results particularly in children. Pulse oximetry, an atraumatic approach, is used to measure oxygen saturation in vascular system. The aim of this study was to investigate the use of pulse oximetry to evaluate pulp vitality status in immature permanent teeth. Methods and materials: The study was conducted on 329 maxillary central and lateral incisors in children. The negative control group consisted of 10 root filled teeth. Systemic oxygen saturation was first measured on the thumb of the individual using a custom-made sensor. Oxygen saturation values of the teeth were then evaluated. The correlation between oxygen saturation measurement obtained from finger and tooth, and the correlation between oxygen saturation values and stage of root development were analyzed. A further comparison was made between the teeth with open and closed apex. Results: Mean oxygen values recorded in the patient's finger were 97.17, and mean oxygen values in the maxillary central and lateral incisors were 86.77 and 83/92, respectively. There was no significant correlation between blood oxygen levels in the finger and in the teeth. (P > 0.05) There was a significant negative correlation between the stage of root development and the blood oxygen levels in the patients' teeth. (P < 0.05) Mean oxygen values in the teeth with open apex were significantly higher than the teeth with closed apex. (P < 0.001). Conclusion: Vital teeth provided consistent oxygen saturation readings, and non-vital teeth recorded no oxygen saturation values. During tooth development, the oxygen saturation values decreased. These findings confirm that the pulse oximetry is capable of detecting the pulpal blood flow and oxygen saturation. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Computations on Sofic S-gap Shifts
Let be an increasing finite or infinite subset of and the -gap shift associated to . Let
be the entropy function which will be
vanished at where is the entropy of the system. Suppose
is sofic with adjacency matrix and the characteristic polynomial
. Then for some rational function ,
. This will be explicitly determined.
We will show that or
when or
respectively. Here is the zeta function of . We will also compute
the Bowen-Franks groups of a sofic -gap shift.Comment: This paper has been withdrawn due to extending results about SFT
shifts to sofic shifts (Theorem 2.3). This forces to apply some minor changes
in the organization of the paper. This paper has been withdrawn due to a flaw
in the description of the adjacency matrix (2.3
Quantum walks on general graphs
Quantum walks, both discrete (coined) and continuous time, on a general graph
of N vertices with undirected edges are reviewed in some detail. The resource
requirements for implementing a quantum walk as a program on a quantum computer
are compared and found to be very similar for both discrete and continuous time
walks. The role of the oracle, and how it changes if more prior information
about the graph is available, is also discussed.Comment: 8 pages, v2: substantial rewrite improves clarity, corrects errors
and omissions; v3: removes major error in final section and integrates
remainder into other sections, figures remove
An Efficient Automatic Mass Classification Method In Digitized Mammograms Using Artificial Neural Network
In this paper we present an efficient computer aided mass classification
method in digitized mammograms using Artificial Neural Network (ANN), which
performs benign-malignant classification on region of interest (ROI) that
contains mass. One of the major mammographic characteristics for mass
classification is texture. ANN exploits this important factor to classify the
mass into benign or malignant. The statistical textural features used in
characterizing the masses are mean, standard deviation, entropy, skewness,
kurtosis and uniformity. The main aim of the method is to increase the
effectiveness and efficiency of the classification process in an objective
manner to reduce the numbers of false-positive of malignancies. Three layers
artificial neural network (ANN) with seven features was proposed for
classifying the marked regions into benign and malignant and 90.91% sensitivity
and 83.87% specificity is achieved that is very much promising compare to the
radiologist's sensitivity 75%.Comment: 13 pages, 10 figure
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