69 research outputs found
The Study of Capacitance Change during Electrolyte Penetration through Carbon-Supported Hydrous Ruthenium Oxide Prepared by the Sol-Gel Procedure
The changes in capacitive behavior of C/HxRuOy composite material prepared by impregnating the VulcanĀ® XC 72R carbon black with oxide sols of different particle size are investigated as the electrolyte penetrates through the thin layer of the NafionĀ®-covered composite. The techniques of cyclic voltammetry and electrochemical impedance
spectroscopy are used. Results of the investigation reveal the influence of potential cycling and the exposure time to the electrolyte on registered capacitive characteristics of composite. The cycling in a wide potential range causes the decrease in energy storage ability which depends on oxide particle size. Impedance measurements, however, show that the ability initially decreases and subsequently increases during exposure to the electrolyte as the consequence of the presence of NafionĀ® top-layer. Due to wettability and resistance issues, NafionĀ® top-layer can affect the pseudo-capacitive characteristics, and the energy storage ability of the composite consequently decreases
A survey of partial differential equations in geometric design
YesComputer aided geometric design is an area
where the improvement of surface generation techniques
is an everlasting demand since faster and more accurate
geometric models are required. Traditional methods
for generating surfaces were initially mainly based
upon interpolation algorithms. Recently, partial differential
equations (PDE) were introduced as a valuable
tool for geometric modelling since they offer a number
of features from which these areas can benefit. This work
summarises the uses given to PDE surfaces as a surface
generation technique togethe
A PDE patch-based spectral method for progressive mesh compression and mesh denoising
The development of the patchwise partial differential equation (PDE) framework a few years ago has paved the way for the PDE method to be used in mesh signal processing. In this paper, we, for the first time, extend the use of the PDE method to progressive mesh compression and mesh denoising. We, meanwhile, upgrade the existing patchwise PDE method in patch merging, mesh partitioning, and boundary extraction to accommodate mesh signal processing. In our new method, an arbitrary mesh model is partitioned into patches, each of which can be represented by a small set of coefficients of its PDE spectral solution. Since low-frequency components contribute more to the reconstructed mesh than high-frequency ones, we can achieve progressive mesh compression and mesh denoising by manipulating the frequency terms of the PDE solution. Experimental results demonstrate the feasibility of our method in both progressive mesh compression and mesh denoising
Day of the week effect in paper submission/acceptance/rejection to/in/by peer review journals
This paper aims at providing an introduction to the behavior of authors submitting a paper to a scientific journal. Dates of electronic submission of papers to the Journal of the Serbian Chemical Society have been recorded from the 1st January 2013 till the 31st December 2014, thus over 2 years. There is no Monday or Friday effect like in financial markets, but rather a TuesdayāWednesday effect occurs: papers are more often submitted on Wednesday; however, the relative number of going to be accepted papers is larger if these are submitted on Tuesday. On the other hand, weekend days (Saturday and Sunday) are not the best days to finalize and submit manuscripts. An interpretation based on the type of submitted work (āexperimental chemistryā) and on the influence of (senior) coauthors is presented. A thermodynamic connection is proposed within an entropy context. A (new) entropic distance is defined in order to measure the āopaquenessā = disorder) of the submission process
Mechanism of 3-deazaguanine transport in the rat heart
The aim of this
study was to determine the mechanism of transport of 3-deazaguanine in the
rat heart. We used single-pass, paired-tracer dilution method on isolated and
retrogradely perfused rat hearts. The maximal cellular uptake (Umax)
and total cellular uptake (Utot) of 3-deazaguanine were determined
under control conditions and under influence of possible modifiers. Both Umax
and Utot were significantly reduced in the presence of unlabeled
3-deazaguanine (from 19.57Ā±2.02%
to 8.14Ā±1.19% and from 16.49Ā±3.65% to 4.70Ā±1.96%, n=6, respectively). The presence of
pyrimidine nucleoside thymidine caused the reduction of both Umax
and Utot (from 20.03Ā±3.76% to 13.58Ā±3.16% and from 16.43Ā±3.58% to 11.94Ā±3.13%, n=6, respectively). Also, we tested the
effect of the absence of sodium ions in perfusion solution (both Umax
and Utot significantly reduced from 17.95Ā±2.73% to 16.67Ā±2.16% and from 16.68Ā±2.97% to 14.81Ā±3.04%, n=6, respectively) and the effect of
dinitrophenol (both Umax and Utot significantly reduced
from 19.09Ā±3.68% to 10.58Ā±3.14% and from 16.86Ā±3.84% to 7.10Ā±3.11%, n=6, respectively). The results of self- and
cross-inhibition studies show that the transport of 3-deazaguanine is
saturable, energy- and sodium-dependent and that 3-deazaguanine uses
endogenous transport systems for thymidine and adenosine for its own
transport
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