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Sökning: LAR1:gu > (2010) > Chalmers tekniska högskola

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1.
  • Adams, Kelly L., et al. (författare)
  • Steady-State Electrochemical Determination of Lipidic Nanotube Diameter Utilizing an Artificial Cell Model
  • 2010
  • Ingår i: Analytical Chemistry. - 1520-6882. ; 82:3, s. 1020-1026
  • Tidskriftsartikel (refereegranskat)abstract
    • By exploiting the capabilities of steady-state electrochemical measurements, we have measured the inner diameter of a lipid nanotube using Fick’s first law of diffusion in conjunction with an imposed linear concentration gradient of electroactive molecules over the length of the nanotube. Fick’s law has been used in this way to provide a direct relationship between the nanotube diameter and the measurable experimental parameters Δi (change in current) and nanotube length. Catechol was used to determine the Δi attributed to its flux out of the nanotube. Comparing the nanotube diameter as a function of nanotube length revealed that membrane elastic energy was playing an important role in determining the size of the nanotube and was different when the tube was connected to either end of two vesicles or to a vesicle on one end and a pipet tip on the other. We assume that repulsive interaction between neck regions can be used to explain the trends observed. This theoretical approach based on elastic energy considerations provides a qualitative description consistent with experimental data.
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2.
  • Ahlgren, Cecilia, 1946-, et al. (författare)
  • High risk of MS in Iranian immigrants in Gothenburg, Sweden.
  • 2010
  • Ingår i: Multiple sclerosis journal. - 1477-0970. ; 16:9, s. 1079-1082
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: In this study we investigated the risk of multiple sclerosis (MS) in migrants who had moved from Iran to Gothenburg, Sweden. METHODS: Patients born in Iran were retrieved from a population-based cohort, which included 534 MS and clinically isolated syndrome patients, born 1959-1990, aged 10-39 years at disease onset in Gothenburg. The expected versus observed number of migrants from Iran was calculated. RESULTS: The MS risk in the Iranian migrants in Gothenburg was several times higher than in Isfahan, Iran (hazard ratio 3.88, 95% confidence interval 2.17-6.40). Compared with the general population of Gothenburg, the observed number of 17 Iranian patients was higher than the expected value of 9.89 (hazard ratio 1.72, 95% confidence interval 1.00-2.75). CONCLUSION: Migration from a medium-risk to a high-risk area may increase the MS risk to that of the high-risk area.
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3.
  • Ahmed, Istaq, 1972-, et al. (författare)
  • Effect of co-doping on proton conductivity in perovskite oxides BaZr0.9In0.05M0.05O3−δ (M = Yb3+ or Ga3+)
  • 2010
  • Ingår i: International Journal of Hydrogen Energy. - 0360-3199. ; 35:12, s. 6381-6391
  • Tidskriftsartikel (refereegranskat)abstract
    • BaZr0.9In0.05M0.05O3-d (M ¼ Ga3+ or Yb3+) has been prepared by solid-statesynthesis route. Rietveld analysis of neutron powder diffraction data on as-prepared samples showed that both samples crystallise in the cubic space group Pm-3m. Scanning electron microscopy analysis showed that the grains intheBaZr0.9In0.05Ga0.05O3-d sample were larger than the BaZr0.9In0.05Yb0.05O3-d sample. Dynamic thermogravimetric analysis indicates that the proton concentration was higher inpre-hydrated BaZr0.9In0.05Ga0.05O3-d sample (40%of theoretical)than that of BaZr0.9In0.05Yb0.05O3-d sample (28%oftheoretical).Proton conductivity was studied on pre-hydrated samples(under both dry and wetAr atmospheres).The bulk proton conductivities of the heating cycle of pre-hydrated BaZr0.9In0.05M0.05O3-d (M ¼ Ga3+ or Yb3+) samples were 2.1 * 10-5 S cm-1 and 1.9 * 10-4 S cm-1 at 350C, respectively.The effect of co-doping onproton conductivity was investigated and the results are compared with single doped systems e.g. BaZr0.9M0.1O3-d (M=Ga3+, In3+ or Yb3+) samples.
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4.
  • Ahmed, Istaq, 1972-, et al. (författare)
  • Improved Proton Conductivity in Spark-Plasma Sintered Dense Ceramic BaZr0.5In0.5O3-delta
  • 2010
  • Ingår i: Electrochemical and Solid State Letters. - 1099-0062. ; 13:11, s. 130-134
  • Tidskriftsartikel (refereegranskat)abstract
    • Spark-plasma sintering method was used to prepare dense proton conducting perovskite oxide BaZr0.5In0.5O3-delta. Analysis of X-ray powder diffraction data showed that the sample adopt the cubic crystal structure having the space group Pm3m. Thermogravimetric analysis of prehydrated samples showed significant mass losses beyond 300 degrees C due to loss of protons as water vapor. Scanning electron microscope images show that the grain size of the spark-plasma sintered dense sample was smaller than that of solid-state sintered porous sample. The highest total proton conductivity (2 X 10(-3) S cm(-1) at 450 degrees C) was found for dense spark-plasma sintered sample under wet H-2 than the samples prepared by other routes.
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5.
  • Ahmed, Istaq, 1972-, et al. (författare)
  • Proton Conductivity in Mixed B-Site Doped Perovskite Oxide BaZr[sub 0.5]In[sub 0.25]Yb[sub 0.25]O[sub 3 - delta]
  • 2010
  • Ingår i: Journal of The Electrochemical Society. - 0013-4651. ; 157:12, s. 1819-1824
  • Tidskriftsartikel (refereegranskat)abstract
    • A wet chemical route was used to prepare the oxygen deficient codoped perovskite oxide BaZr0.5In0.25Yb0.25O3−. Analysis of X-ray powder diffraction data showed that the sample belongs to the cubic crystal system with space group Pmm. Dynamic thermogravimetric (TG) analysis confirmed complete filling of oxygen vacancies (V) by protonic defects (OH) during the hydration process. The proton conductivity was investigated by impedance spectroscopy. The bulk and total conductivities of prehydrated BaZr0.5In0.25Yb0.25O3− were found to be 8.5×10−4 and 2.2×10−5 S cm−1, respectively, at 300°C. The total conductivity in the codoped perovskite oxide was higher compared to that of the respective single doped perovskite oxides with the same doping level. The bulk and grain-boundary mobility and diffusion coefficients of protons were calculated at 200°C using impedance and TG data to obtain the conductivity and proton concentration, respectively. The high bulk diffusivity (2.3×10−7 cm2 s−1) was obtained which indicates that the protons are more free to move in the heavily doped matrix compared to the lightly doped systems where trapping of protons occurs.
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6.
  • Albin, Patrik, 1960-, et al. (författare)
  • A New Proof of an Old Result by Pickands
  • 2010
  • Ingår i: Electronic Communications in Probability. - 1083-589X. ; 15, s. 339-345
  • Tidskriftsartikel (refereegranskat)abstract
    • Let {xi(t)}(t is an element of[0,h]) be a stationary Gaussian process with covariance function r such that r(t) = 1 - C vertical bar t vertical bar(alpha) + o(vertical bar t vertical bar(alpha)) as t -> 0. We give a new and direct proof of a result originally obtained by Pickands, on the asymptotic behaviour as u -> infinity of the probability P{sup(t is an element of vertical bar 0,h vertical bar) xi(t) > u} that the process xi exceeds the level u. As a by-product, we obtain a new expression for Pickands constant H alpha
7.
  • Alexanderson, Camilla, et al. (författare)
  • A single early postnatal estradiol injection affects morphology and gene expression of the ovary and parametrial adipose tissue in adult female rats.
  • 2010
  • Ingår i: The Journal of steroid biochemistry and molecular biology. - 1879-1220. ; 122:1-3, s. 82-90
  • Tidskriftsartikel (refereegranskat)abstract
    • Events during early life can affect reproductive and metabolic functions in adulthood. We evaluated the programming effects of a single early postnatal estradiol injection (within 3h after birth) in female rats. We assessed ovarian and parametrial adipose tissue morphology, evaluated gene expression related to follicular development and adipose tissue metabolism, and developed a non-invasive volumetric estimation of parametrial adipose tissue by magnetic resonance imaging. Estradiol reduced ovarian weight, increased antral follicle size and number of atretic antral follicles, and decreased theca interna thickness in atretic antral follicles. Adult estradiol-injected rats also had malformed vaginal openings and lacked corpora lutea, confirming anovulation. Estradiol markedly reduced parametrial adipose tissue mass. Adipocyte size was unchanged, suggesting reduced adipocyte number. Parametrial adipose tissue lipoprotein lipase activity was increased. In ovaries, estradiol increased mRNA expression of adiponectin, complement component 3, estrogen receptor alpha, and glucose transporter 3 and 4; in parametrial adipose tissue, expression of complement component 3 was increased, expression of estrogen receptor alpha was decreased, and expression of leptin, lipoprotein lipase, and hormone-sensitive lipase was unaffected. These findings suggest that early postnatal estradiol exposure of female rats result in long-lasting effects on the ovary and parametrial adipose tissue at adult age.
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8.
  • Allwood, Jens, 1947-, et al. (författare)
  • Work on Spoken (Multimodal) Corpora in South Africa.
  • 2010
  • Ingår i: Calzolari, N, Choukri, K. Maegaard, B, Mariani, J., Odijk, J, Piperidis, S, Rosner, M. & Tapias, D. (Eds.) Proceedings of the Seventh conference on International Language Resources and Evaluation (LREC'10) Valetta, Malta May 19-21. European Language Resources Association (ELRA). http://www.lrec-conf.org/proceedings/lrec2010/index.html (ALLWOOD 10.438).. - 2951740867
  • Konferensbidrag (refereegranskat)
9.
  • Almanasreh, Hasan, 1981- (författare)
  • The Dirac Operator; From Numerics to the Theory of G-convergence
  • 2010
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • We consider two main issues concerning the Dirac operator, the first is widely known as the appearance of spurious eigenvalues within the spectrum. The second is the study of the asymptotic behavior of the eigenvalues for a family of Dirac operators with oscillatory potential added to the Coulomb-Dirac Hamiltonian. In the first problem a stable Finite element scheme is used to treat the problem of spuriousity of the radial Dirac operator with a Coulomb potential. The numerical accuracy depends strongly on the derivation of a fine-intrinsic stability parameter. In the second problem we consider the Coulomb-Dirac operator with addition to an abstract oscillating potential. Using the spectral measure of operators we project into the positive part of the perturbed Hamiltonian. By using G-convergence theory of positive self-adjoint operators in Hilbert spaces and ¡- convergence of the associated quadratic functionals we prove G-compactness for a family of positive Dirac operators under certain assumptions on the potentials.
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10.
  • Almotairi, Badi, 1970-, et al. (författare)
  • Information Flows Supporting Hinterland Transport: Applications in Sweden
  • 2010
  • Ingår i: Dryport Conference, Edinburgh, 21-22 October.
  • Konferensbidrag (refereegranskat)abstract
    • This article analyses how information and communication technology (ICT) is used to support hinterland transport of maritime containers. The focus is on how information is conveyed between actors using an ICT facility structure and how integrative information is used by different partners’ information systems for making the different transport operations more efficient and enabling an improved service offer. The analysis includes identification of the actor network and the management components in line with supply chain management (SCM) perspectives. To support this analysis a conceptual model showing the relationship between the integrative information and integrative technology was constructed and related to business process and an ICT maturity model found in the literature. Interviews have been conducted with actors involved in Swedish hinterland rail transport. The information flows have been mapped and the analysis shows that the current level of integration and ICT maturity is fairly low, but that several actors currently are modernising their systems. Their main motivation is to reduce the administrative tasks, rather than achieving a supply chain integration. The article shows that a proper handling of the information flow opens up for new business models and can make existing models more efficient. The ICT system must support the proper integration of the ocean, seaport and hinterland parts of the transport chain as well as auxiliary services.
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