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Träfflista för sökning "WFRF:(Engquist M.) "

Sökning: WFRF:(Engquist M.)

  • Resultat 1-10 av 28
  • [1]23Nästa
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  • Khan, Z. U., et al. (författare)
  • Thermoelectric Polymers and their Elastic Aerogels
  • 2016
  • Ingår i: Advanced Materials. - John Wiley & Sons. - 0935-9648 .- 1521-4095.
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Electronically conducting polymers constitute an emerging class of materials for novel electronics, such as printed electronics and flexible electronics. Their properties have been further diversified to introduce elasticity, which has opened new possibility for "stretchable" electronics. Recent discoveries demonstrate that conducting polymers have thermoelectric properties with a low thermal conductivity, as well as tunable Seebeck coefficients - which is achieved by modulating their electrical conductivity via simple redox reactions. Using these thermoelectric properties, all-organic flexible thermoelectric devices, such as temperature sensors, heat flux sensors, and thermoelectric generators, are being developed. In this article we discuss the combination of the two emerging fields: stretchable electronics and polymer thermoelectrics. The combination of elastic and thermoelectric properties seems to be unique for conducting polymers, and difficult to achieve with inorganic thermoelectric materials. We introduce the basic concepts, and state of the art knowledge, about the thermoelectric properties of conducting polymers, and illustrate the use of elastic thermoelectric conducting polymer aerogels that could be employed as temperature and pressure sensors in an electronic-skin.</p>
  • Liedberg, Bo, et al. (författare)
  • Self-assembly of alpha-functionalized terthiophenes on gold
  • 1997
  • Ingår i: JOURNAL OF PHYSICAL CHEMISTRY B. - AMER CHEMICAL SOC. - 1089-5647. ; 101:31, s. 5951-5962
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>alpha-Functionalized terthiophenes containing disulfide (-S-T-3-H)(2) and alkanethiol (HS-(CH2)(11)-T-3-H) anchoring groups have been synthesized for direct immobilization onto gold. Monolayer structures of these compounds are prepared by spontaneous assembly from ethanol solutions on evaporated gold substrates and thoroughly characterized by ellipsometry, contact angle goniometry, infrared and X-ray photoelectron spectroscopy, and cyclic voltammetry. The two molecules coordinate to the gold substrate exclusively via the anchoring groups upon formation of gold-thiolate bonds. The kinetics of monolayer formation vary dramatically for the two compounds. The alkanethiol analogue assembles rapidly, within a few minutes, and forms a densely packed and highly organized monolayer, with the alkyl chains in an almost perfect all-trans conformation and the C-alpha-C-alpha axis of the alpha-T-3 units tilted about 14 degrees away from the surface normal. The assembly process is much slower for the disulfide, but an organized monolayer with an average alpha-T-3 chain tilt of about 33 degrees will eventually form when the assembly is allowed to equilibrate with a solution containing the disulfide for at least 1 day. Moreover, the two monolayer assemblies also display a remarkably different electrochemical, behavior. The heterogeneous electron-transfer rate at the disulfide-covered gold substrate is almost indistinguishable from that at bare gold, suggesting that the assembly contains a large number of easily accessible defects. An alternative mechanism for explaining the large electron-transfer rate involving electronic coupling via the conjugated pi-system of the alpha-T-3 units is also proposed. The electrochemical response is significantly reduced for the HS-(CH2)(11)-T-3-H assembly, but another type of defects, the so-called shallow defects originating from sparsely populated areas on the electrode surface, can be identified.</p>
  • Yang, Zhongping, et al. (författare)
  • Preparation and characterization of mixed monolayer assemblies composed of thiol analogues of cholesterol and fatty acid
  • 1997
  • Ingår i: Langmuir. - American Chemical Society. - 0743-7463 .- 1520-5827. ; 13:12, s. 3210-3218
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Mixed self-assembled monolayers provide an attractive model system for investigating the role of different molecules in biological membranes. This paper describes the preparation and characterization of a novel type of mixed monolayer assemblies composed of thiol analogues of cholesterol and fatty acid. The mixed: monolayers are prepared by coadsorbing 11-mercaptoundecanoic acid (MUA) and thiocholesterol(cholest-5-ene-3 beta-thiol, TC) from solution directly onto evaporated gold surfaces. The influence of TC on the molecular composition and conformation in the mixed monolayer is analyzed by using a combination of infrared reflection-absorption spectroscopy (IRAS), X-ray photoelectron spectroscopy (XPS), ellipsometry, contact angle measurement, and cyclic voltammetry. The results indicate that the TC molecules maintain their conformation in the mixed monolayers, whereas the MUA molecules display a significantly more disordered conformation as compared to the MUA molecules in the pure monolayer. Cyclic voltammetry shows that the mixed monolayers are more densely packed and less permeable than the pure TC and MUA monolayers. The kinetics of the coadsorption of TC and MUA from ethanol indicates that adsorption of TC initially is strongly preferred over MUA but that MUA dominates over TC at long coadsorption times. This is because there is a larger energy gain per unit area in forming monolayers with MUA, Further, it is also seen that the number of molecules per unit area changes with the molecular composition, as a consequence of the different sizes of TC and MUA. We present herein a method for calculating the mole fraction of TC on the gold surface, (chi TC), which accounts for this variation. As a consequence of the dissimilar size and shape of the two molecules, the wetting properties of the mixed monolayer are found to be mainly governed by the fractional area of TC, rather than by the molecular composition of TC, (chi TC).</p>
  • Ariel, Gil, et al. (författare)
  • Gaussian Beam Decomposition of High Frequency Wave Fields Using Expectation-Maximization
  • 2011
  • Ingår i: Journal of Computational Physics. - Elsevier. - 0021-9991 .- 1090-2716. ; 230:6, s. 2303-2321
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A new numerical method for approximating highly oscillatory wave fields as a superposition of Gaussian beams is presented. The method estimates the number of beams and their parameters automatically. This is achieved by an expectation–maximization algorithm that fits real, positive Gaussians to the energy of the highly oscillatory wave fields and its Fourier transform. Beam parameters are further refined by an optimization procedure that minimizes the difference between the Gaussian beam superposition and the highly oscillatory wave field in the energy norm.</p>
  • Bäckman, Karin, et al. (författare)
  • Deep venous thrombosis : A new task for primary health care - A randomised economic study of outpatient and inpatient treatment
  • 2004
  • Ingår i: Scandinavian Journal of Primary Health Care. - 0281-3432 .- 1502-7724. ; 22:1, s. 44-49
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Objective - A health economic evaluation of two alternative treatment settings, inpatient care and outpatient care, for acute deep venous thrombosis. Design - A randomised multicentre trial in a defined population in regular clinical practice. Setting - Hospitals and related health care centres in the Jönköping county council in Sweden. Interventions - Patients were randomised to either an inpatient strategy (n = 66) or an outpatient strategy (n = 65) using low-molecular-weight heparin, dalteparin, administered subcutaneously once daily and adjusted for body weight. Subjects - Of 224 eligible patients, 131 entered the trial and 124 completed the economic part of the study. Main outcome measures - Direct medical and direct non-medical costs during a 3-month period. Results - Total direct costs were higher for those in the inpatient strategy group, i.e. Swedish Crowns (SEK) 16 400 per patient (Euro 1899) compared to SEK 12 100 per patient (Euro 1405) in the outpatient strategy group (p < 0.001). More patients in the outpatient group received assistance when they returned home. Few patients in either group reported sick leave. There was no difference in total number of days between the two groups. Conclusions - Total direct costs were significantly lower for the outpatient treatment strategy for deep venous thrombosis compared to the inpatient treatment strategy. No significant difference in health impact could be detected. Deep venous thrombosis can to a greater extent than previously be treated in primary care, safely, at a lower cost, and in accordance with patient preferences.</p>
  • Dorobantu, M, et al. (författare)
  • Wavelet-based numerical homogenization
  • 1998
  • Ingår i: SIAM Journal on Numerical Analysis. - 0036-1429 .- 1095-7170. ; 35:2, s. 540-559
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A numerical homogenization procedure for elliptic differential equations is presented. It is based on wavelet decompositions of discrete operators in find and coarse scale components followed by the elemination of the fine scale contributions. If the operator is in divergence form, this is preserved by the homogenization procedure. For periodic problems, results similar to classical effective coefficient theory is proved. The procedure can be applied to problems that are not cell-periodic.</p>
  • Edberg, Jesper, 1988-, et al. (författare)
  • Electrochemical circuits from ‘cut and stick’ PEDOT:PSS-nanocellulose composite
  • 2017
  • Ingår i: Flexible and printed electronics. - Institute of Physics (IOP). - 2058-8585. ; 4:2
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a flexible self-standing adhesive composite made from PEDOT:PSS and nanofibrillated cellulose. The material exhibits good combined mechanical and electrical characteristics(an elastic modulus of 4.4 MPa, and an electrical conductivity of 30 S cm−1 ). The inherent self-adhesiveness of the material enables it to be laminated and delaminated repeatedly to form and reconfigure devices and circuits. This modular property opens the door for a plethora of applications where reconfigurability and ease-of-manufacturing are of prime importance. We also demonstrate a paper composite with ionic conductivity and combine the two materials to construct electrochemical devices, namely transistors, capacitors and diodes with high values of transconductance, charge storage capacity and current rectification. We have further used these devices to construct digital circuits such as NOT, NAND and NOR logic.</p>
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