1,720,991 research outputs found
Polymer-based redox supercapacitors: A comparative study
No full textThe increasing attention being given to supercapacitors is stimulated by the prospect of using such devices as secondary power sources in electric vehicle propulsion. The present study focuses on redox supercapacitors with electronically conducting polymers as electrode materials. Performance data of a symmetric supercapacitor based on p-doped poly(pyrrole), of an unsymmetric supercapacitor based on both p-doped poly(pyrrole) and poly(3-methylthiophene), and of a symmetric supercapacitor based on p-and n-doped poly(dithieno[3,4-b : 3′,4′-d]thiophene) are here compared
Characterization by impedance spectroscopy of a polymer-based supercapacitor
No full textThe performance of a polymer redox supercapacitor based on poly(dithieno[3,4-b: 3′,4′-d] thiophene) in liquid and in polymer gel electrolyte was tested for capacity, energy density, power density and self-discharge. The results are very promising and demonstrate the viability of a symmetric supercapacitor based on an n-and p-doped electronically conducting polymer. © 1995
Poly(3-methylthiophenes) for an all polymer electrochromic device
No full textAn important feature for electrochromic windows is an all-solid configuration and in this connection
we present the performance of the poly(3-methylthiophene)//poly(3,J-dimethyl,2,2'-bithiophene) electrochromic device with a polyacrylonitrile (PAN)-based gel electrolyte
Polymer-based electrochemical devices
No full textSelected findings of ongoing investigations of variable light-transmission electrochromic devices using electronically conducting polymers as electrochromic materials are presented and discussed. An obvious requisite for electrochromic windows is an all-solid configuration with polymer electrolyte; in this connection testing data of a new hybrid electrolyte based on a polymer network including a plasticizer are reported and discussed
Impedance spectroscopy in electrode/electrolyte interface investigations
No full textElectrochemical characteristics of two propylene carbonate-encapsulating polymer electrolytes based on a polyester of 3,3'-thiodipropionic acid and tri-ethylene glycol, and on a bis-amino poly(ethyleneoxide) PEO-poly(propyleneoxide) (PPO) copolymer, respectively, are compared to those of a polymer network based on PEO and a styrenic macromonomer of PEO, with particular emphasis on Li/polymer electrolyte interface stability. © 1994
Poly N-(oxyalkyl)pyrrole electrodes and (PEOSEO)20LiClO4 polymer electrolyte in lithium rechargeable batteries
No full textCyclability data of new "tailor made" poly N-(oxyalkyl)pyrrole electrodes both in organic liquid electrolyte and in solid-state cells with (PEOSEO)20LiClO4 (a new polymer electrolyte conceived for room temperature applications) are reported. Specific effect of polyether groups in improving the charge-discharge processes of polypyrrole-based electrodes in solid-state batteries are demonstrated. In addition, the data of complex impedance evidence no ageing process, up to the 103 h tested, at 25°C of the (PEOSEO)20LiClO4. © 1992
Electronically conducting polymers and activated carbon: Electrode materials in supercapacitor technology
No full textThe growing interest in supercapacitors is stimulated by their potential application as power-storage devices operating
in parallel with the battery in an electric vehicle (EV) to
provide pulses of peak power during acceleration and on
uphill gradients.“] Many academic and industrial laboratories
are currently investigating two types of supercapacitor:
the ‘double-layer’ and the ‘redox’. The chargestorage
mode is different in each: the capacitance in the
former is electrostatic in origin, i.e. it arises from the
separation of electron and ionic charges at the interface
between high specific-area electrode and an aqueous or an
organic electrolyte;[21 in the latter, fast Faradaic chargetransfer
takes place at the electrode materials, as in a
battery, and produces what is called pseudo~apacitance
Electrochemical characterization of new conducting polymer electrolytes
No full textPrepared with bis-amino PEO/PPO copolymers, with and without amino PEO oligomers, and the cross-linking agent butanediol diglycidyl ether, a new series of cross-linked polymer electrolytes were investigated for their ionic conductivity and for the electrochemical properties of lithium cycleability and lithium polymer electrolyte compatibility. Room-temperature conductivity was found to be two order of magnitude higher than that of 'conventional' PEO-based electrolytes; compatibility with metallic lithium proved to be fairly good. © 1993
Pulmonary hypertension in sickle cell disease children under 10 years of age
No full textBr J Haematol. 2010 Sep;150(5):601-9. Epub 2010 Jun 10.
Pulmonary hypertension in sickle cell disease children under 10 years of age.
Colombatti R, Maschietto N, Varotto E, Grison A, Grazzina N, Meneghello L, Teso S, Carli M, Milanesi O, Sainati L.
Source
Department of Paediatrics, University of Padova, Padova, Italy. [email protected]
Abstract
Despite the finding of elevated Tricuspid Regurgitant Velocity (TRV) in children below 5 years of age, the prevalence and evolution of Pulmonary Hypertension (PH) in young children with sickle cell disease (SCD) are unclear. In order to identify predictive factors of precocious PH development, SCD children > or =3 years old, at steady state, underwent annual echocardiography and Tissue Doppler Imaging (TDI). Patients receiving chronic transfusion were excluded. Thirty-seven of seventy-five patients were > or =3 years, with measurable TRV. In our young population (mean age 6.2 years) of mainly African, HbS/HbS patients, 8/37 (21.6%) had TRV > or =2.5 m/s, 8% being only 3 years old. Significant correlation was found between precocious TRV elevation and high platelet and reticulocyte counts and frequent acute chest syndromes (ACS). In multivariate analysis, ACS was the only variable predicting TRV > or =2.5 m/s. TDI of the 37 patients showed signs of diastolic dysfunction of the left ventricle. At follow-up all eight patients with high TRV displayed further increase and seven more developed TRV > or =2.5 m/s. PH seems to begin in children earlier than expected. Factors involved in its early onset might be different from the ones causing its development in older children or adults. African children might benefit from early screening and re-assessment once a year.
PMID:
20553267
[PubMed - indexed for MEDLIN
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