38 research outputs found
Development of a fuzzy logic-based solar charge controller for charging lead-acid batteries
Este documento se considera que es una ponencia de congresos en lugar de un artículo.International Conference on Computer Science, Electronics and Industrial Engineering (CSEI 2019), Oct. 28-31 2019, Ambato (Ecuador)The design and implementation of a solar charge controller for lead-acid batteries is intended to supplement a component of the water purification module of the water treatment unit for natural disaster relief.
This unit contains a solar panel system that supplies power to the module by
charging batteries through a controller comprising an Atmega 328 processor. The
solar panel feeds voltage to the batteries through fuzzy logic-based software,
which allows up to 6 A DC to pass through the controller's power circuit.
Consequently, the battery was charged in less time (an average of 7 h to reach
maximum capacity), wherein battery lifespan is related to the charge wave
frequency. Thus, our software may be adapted in different control algorithms
without having to change hardware
The acridonecarboxamide GF120918 potently reverses P-glycoprotein-mediated resistance in human sarcoma MES-Dx5 cells
The doxorubicin-selected, P-glycoprotein (P-gp)-expressing human sarcoma cell line MES-Dx5 showed the following levels of resistance relative to the non-P-gp-expressing parental MES-SA cells in a 72 h exposure to cytotoxic drugs: etoposide twofold, doxorubicin ninefold, vinblastine tenfold, taxotere 19-fold and taxol 94-fold. GF120918 potently reversed resistance completely for all drugs. The EC50s of GF120918 to reverse resistance of MES-Dx5 cells were: etoposide 7 ± 2 nM, vinblastine 19 ± 3 nM, doxorubicin 21 ± 6 nM, taxotere 57 ± 14 nM and taxol 91 ± 23 nM. MES-Dx5 cells exhibited an accumulation deficit relative to the parental MES-SA cells of 35% for [3H]-vinblastine, 20% for [3H]-taxol and [14C]-doxorubicin. The EC50 of GF120918, to reverse the accumulation deficit in MES-Dx5 cells, ranged from 37 to 64 nM for all three radiolabelled cytotoxics. [3H]-vinblastine bound saturably to membranes from MES-Dx5 cells with a KD of 7.8 ± 1.4 nM and a Bmax of 5.2 ± 1.6 pmol mg–1 protein. Binding of [3H]-vinblastine to P-gp in MES-Dx5 membranes was inhibited by GF120918 (Ki = 5 ± 1 nM), verapamil (Ki = 660 ± 350 nM) and doxorubicin (Ki = 6940 ± 2100 nM). Taxol, an allosteric inhibitor of [3H]-vinblastine binding to P-gp, could only displace 40% of [3H]-vinblastine (Ki = 400 ± 140 nM). The novel acridonecarboxamide derivative GF120918 potently overcomes P-gp-mediated multidrug resistance in the human sarcoma cell line MES-Dx5. Detailed analysis revealed that five times higher GF120918 concentrations were needed to reverse drug resistance to taxol in the cytotoxicity assay compared to doxorubicin, vinblastine and etoposide. An explanation for this phenomenon had not been found. © 1999 Cancer Research Campaig
Self-Assembled Monolayers of <i>n</i>‑Alkanethiols Suppress Hydrogen Evolution and Increase the Efficiency of Rechargeable Iron Battery Electrodes
Iron-based rechargeable batteries, because of their low
cost, eco-friendliness,
and durability, are extremely attractive for large-scale energy storage.
A principal challenge in the deployment of these batteries is their
relatively low electrical efficiency. The low efficiency is due to
parasitic hydrogen evolution that occurs on the iron electrode during
charging and idle stand. In this study, we demonstrate for the first
time that linear alkanethiols are very effective in suppressing hydrogen
evolution on alkaline iron battery electrodes. The alkanethiols form
self-assembled monolayers on the iron electrodes. The degree of suppression
of hydrogen evolution by the alkanethiols was found to be greater
than 90%, and the effectiveness of the alkanethiol increased with
the chain length. Through steady-state potentiostatic polarization
studies and impedance measurements on high-purity iron disk electrodes,
we show that the self-assembly of alkanethiols suppressed the parasitic
reaction by reducing the interfacial area available for the electrochemical
reaction. We have modeled the effect of chain length of the alkanethiol
on the surface coverage, charge-transfer resistance, and double-layer
capacitance of the interface using a simple model that also yields
a value for the interchain interaction energy. We have verified the
improvement in charging efficiency resulting from the use of the alkanethiols
in practical rechargeable iron battery electrodes. The results of
battery tests indicate that alkanethiols yield among the highest faradaic
efficiencies reported for the rechargeable iron electrodes, enabling
the prospect of a large-scale energy storage solution based on low-cost
iron-based rechargeable batteries
Interface confined hydrogen evolution reaction in zero valent metal nanoparticles-intercalated molybdenum disulfide
10.1038/ncomms14548Nature Communications81454