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  1. Article ; Online: Wide-angle static and dynamic light scattering under shear.

    Kushnir, D / Beyer, N / Bartsch, E / Hébraud, P

    The Review of scientific instruments

    2021  Volume 92, Issue 2, Page(s) 25113

    Abstract: We develop and characterize a wide angle static and dynamic light scattering under shear setup. The apparatus is suitable for the study of the structure and the dynamics of soft materials systems with a sub-micron characteristic length scale. The shear ... ...

    Abstract We develop and characterize a wide angle static and dynamic light scattering under shear setup. The apparatus is suitable for the study of the structure and the dynamics of soft materials systems with a sub-micron characteristic length scale. The shear device consists in two parallel plates, and the optical setup allows us to perform light scattering measurements in any plane that contains the gradient of the velocity field direction. We demonstrate several capabilities of our apparatus: a measurement of the evolution with shear of the first peak of the structure factor of a concentrated suspension of spherical particles, both in the compression and extension quadrants of the shear flow, and the measurement of the velocity profile in dynamic light scattering. We present a theoretical treatment of light scattering under flow that takes into account the Gaussian character of the illumination and detection optical paths, in the case where the scattering volume extension is smaller than the gap of the flow cell, and compare with experimental measurements.
    Language English
    Publishing date 2021-02-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0029533
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  2. Book: Environmental liability, imperfect information and multidimensional pollution control

    Bartsch, Elga

    (Kiel working papers ; 690)

    1995  

    Author's details by Elga Bartsch
    Series title Kiel working papers ; 690
    Kieler Arbeitspapiere
    Collection Kieler Arbeitspapiere
    Keywords Umweltethik ; Umweltverschmutzung ; Umweltschutz ; Umweltüberwachung
    Subject Ökologie ; Umweltvorsorge ; Umweltverunreinigung ; Pollution ; Umweltkontamination ; Ethik ; Ökologische Ethik ; Umwelt ; Umweltschutz ; Bewahrung der Schöpfung ; Schöpfung ; Umweltverantwortung ; Umweltmonitoring ; Umweltkontrolle
    Language German
    Size 25 S. : graph. Darst.
    Publisher Inst. für Weltwirtschaft an der Univ. Kiel
    Publishing place Kiel
    Publishing country Germany
    Document type Book
    HBZ-ID HT006738460
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Shelf markLoan statusLocation
    998/2941 available for loan (reading room) Freihandmagazin (U1)

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  3. Article ; Online: Formation of Laves phases in buoyancy matched hard sphere suspensions.

    Schaertl, N / Botin, D / Palberg, T / Bartsch, E

    Soft matter

    2018  Volume 14, Issue 24, Page(s) 5130–5139

    Abstract: Colloidal Laves phases (LPs) are promising precursors for photonic materials. Laves phases have not yet been observed to form in experiments on colloidal suspensions of hard spheres (HS), even though they have been reported in computer simulations. LP ... ...

    Abstract Colloidal Laves phases (LPs) are promising precursors for photonic materials. Laves phases have not yet been observed to form in experiments on colloidal suspensions of hard spheres (HS), even though they have been reported in computer simulations. LP formation so far has been achieved only for binary mixtures of colloidal charged spheres or ligand-stabilized nano-particles after drying. Using static light scattering, we monitored LP formation and annealing in a binary mixture of buoyant hard sphere approximants (size ratio Γ = 0.77, number or molar fraction of small spheres xS = 0.76) for volume fractions in the fluid-crystal coexistence regions. All samples spontaneously formed MgZn2 type LPs on the time scale of weeks to months via bulk nucleation and growth. Irrespective of the initial suspension volume fractions, the LP volume fraction at coexistence is ΦCOEX = 0.59 which is significantly below the close packing limit ΦMAX = 0.615 and remarkably close to the expectation from simulation. At low volume fractions, crystals anneal to high quality during coarsening which is in line with recent theoretical expectations for the thermodynamic stability of different LP types. At large volume fractions, however, the diffractograms evolve towards a more MgCu2-like appearance which we attribute to the formation of randomly stacked LPs. Such structures are not known from atomic systems.
    Language English
    Publishing date 2018-06-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/c7sm02348k
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  4. Article ; Online: Stress overshoot, hysteresis, and the Bauschinger effect in sheared dense colloidal suspensions.

    Kushnir, Dmytro / Ruscher, Céline / Bartsch, Eckhard / Thalmann, Fabrice / Hébraud, Pascal

    Physical review. E

    2022  Volume 106, Issue 3-1, Page(s) 34611

    Abstract: The mechanical nonlinear response of dense Brownian suspensions of polymer gel particles is studied experimentally and by means of numerical simulations. It is shown that the response to the application of a constant shear rate depends on the previous ... ...

    Abstract The mechanical nonlinear response of dense Brownian suspensions of polymer gel particles is studied experimentally and by means of numerical simulations. It is shown that the response to the application of a constant shear rate depends on the previous history of the suspension. When the flow starts from a suspension at rest, it exhibits an elastic response followed by a stress overshoot and then a plastic flow regime. Conversely, after flow reversal, the stress overshoot does not occur, and the apparent elastic modulus is reduced while numerical simulations reveal that the anisotropy of the local microstructure is delayed relative to the macroscopic stress.
    Language English
    Publishing date 2022-10-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.106.034611
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Pump-and-treat (P&T) vs groundwater circulation wells (GCW): Which approach delivers more sustainable and effective groundwater remediation?

    Ciampi, Paolo / Esposito, Carlo / Bartsch, Ernst / Alesi, Eduard J / Petrangeli Papini, Marco

    Environmental research

    2023  Volume 234, Page(s) 116538

    Abstract: Pump-and-treat (P&T) is commonly used to remediate contaminated groundwater sites. The scientific community is currently engaged in a debate regarding the long-term effectiveness and sustainability of P&T for groundwater remediation. This work aims to ... ...

    Abstract Pump-and-treat (P&T) is commonly used to remediate contaminated groundwater sites. The scientific community is currently engaged in a debate regarding the long-term effectiveness and sustainability of P&T for groundwater remediation. This work aims to provide a quantitative comparative analysis of the performance of an alternative system to traditional P&T, to support the development of sustainable groundwater remediation plans. Two industrial sites with unique geological frameworks and contamination with dense non-aqueous phase liquid (DNAPL) and arsenic (As) respectively, were selected for the study. At both locations, attempts were made for decades to clean up groundwater contamination by pump-and-treat. In response to persistently high levels of pollutants, groundwater circulation wells (GCWs) were installed to explore the possibility of accelerating the remediation process in unconsolidated and rock deposits. This comparative evaluation focuses on the different mobilization patterns observed, resulting variations in contaminant concentration, mass discharge, and volume of extracted groundwater. To facilitate the fusion of multi-source data, including geological, hydrological, hydraulic, and chemical information, and enable the continuous extraction of time-sensitive information, a geodatabase-supported conceptual site model (CSM) is utilized as a dynamic and interactive interface. This approach is used to assess the performance of GCW and P&T at the investigated sites. At Site 1, the GCW stimulated microbiological reductive dichlorination and mobilized significantly higher 1,2-DCE concentrations than P&T, despite recirculating a smaller volume of groundwater. At Site 2, As removal rate by GCW resulted generally higher than pumping wells. One conventional well mobilized higher masses of As in the early stages of P&T. This reflected the P&T's impact on accessible contaminant pools in early operational periods. P&T withdrew a significantly larger volume of groundwater than the GCW. The outcomes unveil the diverse contaminant removal behavior characterizing two distinct remediation strategies in different geological environments, revealing the dynamics and decontamination mechanisms that feature GCWs and P&T and emphasizing the limitations of traditional groundwater extraction systems in targeting aged pollution sources. GCWs have been shown to reduce remediation time, increase mass removal, and minimize the significant water consumption associated with P&T. These benefits pave the way for more sustainable groundwater remediation approaches in various hydrogeochemical scenarios.
    MeSH term(s) Water Pollutants, Chemical/analysis ; Groundwater/chemistry ; Water Wells ; Environmental Pollution/analysis ; Models, Theoretical ; Environmental Restoration and Remediation
    Chemical Substances Water Pollutants, Chemical
    Language English
    Publishing date 2023-07-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2023.116538
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 726: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  6. Article ; Online: Advanced imaging use and delays among inpatients with psychiatric comorbidity.

    Bartsch, Emily / Shin, Saeha / Sheehan, Kathleen / Fralick, Michael / Verma, Amol / Razak, Fahad / Lapointe-Shaw, Lauren

    Brain and behavior

    2024  Volume 14, Issue 2, Page(s) e3425

    Abstract: Objective: To determine whether presence of a psychiatric comorbidity impacts use of inpatient imaging tests and subsequent wait times.: Methods: This was a retrospective cohort study of all patients admitted to General Internal Medicine (GIM) at ... ...

    Abstract Objective: To determine whether presence of a psychiatric comorbidity impacts use of inpatient imaging tests and subsequent wait times.
    Methods: This was a retrospective cohort study of all patients admitted to General Internal Medicine (GIM) at five academic hospitals in Toronto, Ontario from 2010 to 2019. Exposure was presence of a coded psychiatric comorbidity on admission. Primary outcome was time to test, as calculated from the time of test ordering to time of test completion, for computed tomography (CT), magnetic resonance imaging (MRI), ultrasound, or peripherally inserted central catheter (PICC) insertion. Multilevel mixed-effects models were used to identify predictors of time to test, and marginal effects were used to calculate differences in absolute units (h). Secondary outcome was the rate of each type of test included. Subgroup analyses were performed according to type of psychiatric comorbidity: psychotic, mood/anxiety, or substance use disorder.
    Results: There were 196,819 GIM admissions from 2010to 2019. In 77,562 admissions, ≥1 advanced imaging test was performed. After adjusting for all covariates, presence of any psychiatric comorbidity was associated with increased time to test for MRI (adjusted difference: 5.3 h, 95% confidence interval [CI]: 3.9-6.8), PICC (adjusted difference: 3.7 h, 95% CI: 1.6-5.8), and ultrasound (adjusted difference: 3.0 h, 95% CI: 2.3-3.8), but not for CT (adjusted difference: 0.1 h, 95% CI: -0.3 to 0.5). Presence of any psychiatric comorbidity was associated with lower rate of ordering for all test types (adjusted difference: -17.2 tests per 100 days hospitalization, interquartile range: -18.0 to -16.3).
    Conclusions: There was a lower rate of ordering of advanced imaging among patients with psychiatric comorbidity. Once ordered, time to test completion was longer for MRI, ultrasound, and PICC. Further exploration, such as quantifying rates of cancelled tests and qualitative studies evaluating hospital, provider, and patient barriers to timely advanced imaging, will be helpful in elucidating causes for these disparities.
    MeSH term(s) Humans ; Retrospective Studies ; Inpatients ; Comorbidity ; Anxiety ; Substance-Related Disorders
    Language English
    Publishing date 2024-02-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2623587-0
    ISSN 2162-3279 ; 2162-3279
    ISSN (online) 2162-3279
    ISSN 2162-3279
    DOI 10.1002/brb3.3425
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  7. Book ; Thesis: Die Wertigkeit von Zusatzuntersuchungen vom Schädel und Abdomen mittels Computertomographie bei Vorliegen eines Bronchialcarcinoms

    Bartsch, Elisabeth

    1988  

    Size 128 Bl. : graph. Darst.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Düsseldorf, Univ., Diss., 1988
    HBZ-ID HT003426110
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    89 E 2895 order for loan Magazin

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  8. Article: Remediation of chlorinated aliphatic hydrocarbons (CAHs) contaminated site coupling groundwater recirculation well (IEG-GCW®) with a peripheral injection of soluble nutrient supplement (IEG-C-MIX) via multilevel-injection wells (IEG-MIW).

    Ciampi, Paolo / Esposito, Carlo / Bartsch, Ernst / Alesi, Eduard J / Rehner, Gert / Papini, Marco Petrangeli

    Heliyon

    2022  Volume 8, Issue 11, Page(s) e11402

    Abstract: An innovative Groundwater Circulation Well (GCW) process was configured, installed, and tested for optimizing the distribution of a soluble nutrient supplement in a heterogeneous aquifer for reductive dehalogenation. This generated an in-situ bioreactor ... ...

    Abstract An innovative Groundwater Circulation Well (GCW) process was configured, installed, and tested for optimizing the distribution of a soluble nutrient supplement in a heterogeneous aquifer for reductive dehalogenation. This generated an in-situ bioreactor for the enhanced treatment of chlorinated aliphatic hydrocarbons (CAHs). At a site in Barcelona, Spain, trichloroethylene (TCE) concentration was found in the source area to a maximum value of up to 170 mg/L, while the degradation products like 1,2-dichloroethylene (1,2-DCE) and vinyl chloride (VC) were detected in significantly lower concentrations or were even absent. The novel system combined a vertical recirculation well (IEG-GCW®) and four multilevel injection wells (IEG-MIWs) to introduce the carbon solution into the aquifer. A 12 m deep IEG-GCW® equipped with 2 screened sections were located in the center of the 4 IEG-MIWs. The GCW induced flow moves the groundwater in an ellipsoidal recirculation cell to spread the supplements from the central GCW and from the peripheral MIWs in the aquifer body. Two multilevel sampling wells (IEG-MLSWs®) in the radius of influence (ROI) monitor the remediation process to capture hydrochemical variations along the vertical aquifer sections. A multi-source model harmonizes geological and hydrochemical information during different remediation stages, guiding the adaptation of the remediation strategy to physicochemical conditions and unmasking the decontamination mechanics induced by the remedial actions. Hydrochemical monitoring of MLWS and the stable carbon isotopic signature of cis-1,2-DCE and VC show the mobilization of secondary contamination sources triggered by recirculation during remediation, the stimulation of microbiological activity following nutrient supplement via GCW and MIWs, and the strong decrease of CAHs concentrations at different aquifer levels. Evidence from the first application at the field scale reveals a significant increase in the chloroethane biodegradation rate and short-term effectiveness of the innovative remediation strategy. GCW-MIWs synergy represents a promising strategy to degrade CAHs in a shorter period through the combination of a controllable hydraulic system, effective nutrient distribution, and the monitoring of the remediation process.
    Language English
    Publishing date 2022-11-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2022.e11402
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Psycho-vegetative Phänomene im Aderlass-Blut

    Bartsch, Eva

    Naturheilpraxis mit Naturmedizin

    2014  Volume 67, Issue 6, Page(s) 52

    Language German
    Document type Article
    ZDB-ID 605727-5
    ISSN 0177-6754 ; 0028-0941
    Database Current Contents Medicine

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 1101: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  10. Book ; Thesis: Zur Aussagekraft und praktischen Bedeutung der modernen muskelbioptischen Diagnostik

    Bartsch, Eleonore

    1981  

    Size 62 S.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Bonn, Univ., Diss., 1981
    HBZ-ID HT000023039
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    81 D 1130 order for loan Magazin

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