LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 17

Search options

  1. Article: The Climate of St. Moritz, Upper Engadine, Switzerland.

    Platt, W B

    Transactions of the ... Annual Meeting of the American Climatological Association. American Climatological Association. Annual Meeting

    2011  Volume 4, Page(s) 137–142

    Language English
    Publishing date 2011-03-16
    Publishing country United States
    Document type Journal Article
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Book ; Online ; Thesis: Tropospheric BrO plumes in Arctic spring – A comparison of TROPOMI satellite observations and model results

    Schöne, Moritz [Verfasser] / Platt, Ulrich [Akademischer Betreuer]

    2023  

    Author's details Moritz Schöne ; Betreuer: Ulrich Platt
    Keywords Geowissenschaften ; Earth Sciences
    Subject code sg550
    Language English
    Publisher Universitätsbibliothek Heidelberg
    Publishing place Heidelberg
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Dataset of five years of

    Schütt, Eike M / Lehmann, Moritz K / Hieronymi, Martin / Dare, James / Krasemann, Hajo / Hitchcock, Darryn / Platt, Amy / Amai, Klay / McKelvey, Tasman

    Data in brief

    2021  Volume 40, Page(s) 107759

    Abstract: Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water ... ...

    Abstract Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water samples from one or few locations but the assumption of representativeness is seldomly tested. Satellite observations can support environmental monitoring by detecting horizontal variability of water quality attributes over entire lakes. This article is a co-submission with Lehmann et al. (2021), who present a method to create a regional calibration of a satellite chlorophyll
    Language English
    Publishing date 2021-12-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2021.107759
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Book ; Online: Ozone depletion events in the Arctic spring of 2019

    Herrmann, Maximilian / Schöne, Moritz / Borger, Christian / Warnach, Simon / Wagner, Thomas / Platt, Ulrich / Gutheil, Eva

    eISSN: 1680-7324

    A new modeling approach to bromine emissions

    2022  

    Abstract: Ozone depletion events (ODEs) are a common occurence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice or aerosols in an auto-catalytic reaction cycle. Previous three- ... ...

    Abstract Ozone depletion events (ODEs) are a common occurence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice or aerosols in an auto-catalytic reaction cycle. Previous three-dimensional modeling studies of ODEs assumed an infinite bromine source at the ground. In the present study, an alternative emission scheme is presented in which a finite amount of bromide in the snow is tracked over time. For this purpose, a modified version of the W eather R esearch and F orecasting model coupled with Chem istry (WRF-Chem) is used to study ODEs in the Arctic from February to May 2019. The model data are compared to in-situ measurements, ozone sonde flights as well as satellite data. A simulation of the ODEs in the Arctic spring of 2009 using the infinite bromide assumption on first year (FY) ice is transferred to the spring of 2019 which achieves good agreement with the observations, however, there is some disagreement in April 2009 and 2019 with respect to an overestimation concerning both the magnitude and the number of ODEs. New simulations using the finite bromide assumption greatly improve agreement with in-situ observations at Utqiag ̇vik, Alaska, Zeppelin Mountain, Svalbard, and Pallas, Finland in April 2019, suggesting that bromide on the sea ice is depleted to an extent that reduces the bromine release. The new simulations also slightly improve the agreement with observations at these sites in February and March. A comparison to measurements near Eureka, Canada and Nord Station, Greenland shows that multi-year ice and possibly snow-covered land may be significant bromine sources. However, assuming higher releasable bromide near Eureka does not remove all disagreement with the observations. The numerical results are also compared to tropospheric BrO vertical column densities generated with a new retrieval method from TROPOMI observations. BrO VCDs above 5 × 10 13 molec/cm 2 observed by the satellite agree well with the model results. However, ...
    Subject code 551
    Language English
    Publishing date 2022-05-16
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article: Dataset of five years of in situ and satellite derived chlorophyll a concentrations and its spatiotemporal variability in the Rotorua Te Arawa Lakes, New Zealand

    Schütt, Eike M / Lehmann, Moritz K / Hieronymi, Martin / Dare, James / Krasemann, Hajo / Hitchcock, Darryn / Platt, Amy / Amai, Klay / McKelvey, Tasman

    Data in Brief. 2022 Feb., v. 40

    2022  

    Abstract: Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water ... ...

    Abstract Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water samples from one or few locations but the assumption of representativeness is seldomly tested. Satellite observations can support environmental monitoring by detecting horizontal variability of water quality attributes over entire lakes. This article is a co-submission with Lehmann et al. (2021), who present a method to create a regional calibration of a satellite chlorophyll a algorithm and a spatial analysis of an image time series to detect recurring patchiness. Our method was developed on 13 lakes in the central North Island of New Zealand and this publication makes available the data used in our analysis and the spatial fields of results. These data are immediately valuable for practitioners operating within the region of interest providing a five year archive of synoptic water quality data and spatial fields to help optimize in situ monitoring efforts. In addition, there is value to the wider scientific community as the study lakes are a useful ‘natural lab’ for the development of aquatic remote sensing methods due to the range of trophic conditions and water colour in a single satellite image scene. Together with decades of in situ water quality records, our data is therefore useful for the development and validation of widely applicable methods of water quality retrieval from satellite data.
    Keywords algorithms ; chlorophyll ; color ; data collection ; lakes ; remote sensing ; satellites ; time series analysis ; water quality ; New Zealand
    Language English
    Dates of publication 2022-02
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2021.107759
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Book ; Online: The Energy Footprint of Blockchain Consensus Mechanisms Beyond Proof-of-Work

    Platt, Moritz / Sedlmeir, Johannes / Platt, Daniel / Tasca, Paolo / Xu, Jiahua / Vadgama, Nikhil / Ibañez, Juan Ignacio

    2021  

    Abstract: Popular distributed ledger technology (DLT) systems using proof-of-work (PoW) for Sybil attack resistance have extreme energy requirements, drawing stern criticism from academia, businesses, and the media. DLT systems building on alternative consensus ... ...

    Abstract Popular distributed ledger technology (DLT) systems using proof-of-work (PoW) for Sybil attack resistance have extreme energy requirements, drawing stern criticism from academia, businesses, and the media. DLT systems building on alternative consensus mechanisms, foremost proof-of-stake (PoS), aim to address this downside. In this paper, we take a first step towards comparing the energy requirements of such systems to understand whether they achieve this goal equally well. While multiple studies have been undertaken that analyze the energy demands of individual Blockchains, little comparative work has been done. We approach this research question by formalizing a basic consumption model for PoS blockchains. Applying this model to six archetypal blockchains generates three main findings: First, we confirm the concerns around the energy footprint of PoW by showing that Bitcoin's energy consumption exceeds the energy consumption of all PoS-based systems analyzed by at least three orders of magnitude. Second, we illustrate that there are significant differences in energy consumption among the PoSbased systems analyzed, with permissionless systems having an overall larger energy footprint. Third, we point out that the type of hardware that validators use has a considerable impact on whether PoS blockchains' energy consumption is comparable with or considerably larger than that of centralized, non-DLT systems.
    Keywords Computer Science - Distributed ; Parallel ; and Cluster Computing
    Subject code 690
    Publishing date 2021-09-08
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Book ; Online: Energy Demand Unawareness and the Popularity of Bitcoin

    Platt, Moritz / Ojeka, Stephen / Drăgnoiu, Andreea-Elena / Ibelegbu, Oserere Ejemen / Pierangeli, Francesco / Sedlmeir, Johannes / Wang, Zixin

    Evidence from Nigeria

    2022  

    Abstract: Decentralized cryptocurrency networks, notably those with high energy demand, have faced significant criticism and subsequent regulatory scrutiny. Despite these concerns, policy interventions targeting cryptocurrency operations in the pursuit of ... ...

    Abstract Decentralized cryptocurrency networks, notably those with high energy demand, have faced significant criticism and subsequent regulatory scrutiny. Despite these concerns, policy interventions targeting cryptocurrency operations in the pursuit of sustainability have largely been ineffective. Some were abandoned for fear of jeopardizing innovation, whereas others failed due to the highly globalized nature of blockchain systems. In search of a more effective angle for energy policy measures, this study adopts a consumer-centric perspective, examining the sentiments of Nigerian cryptocurrency users (${n=158}$) toward Bitcoin's sustainability, a representative cryptocurrency known for its high electricity demand. Three main findings emerged: 1) Even among those self-identifying as highly knowledgeable, most considerably underestimated Bitcoin's electricity consumption. 2) Participants with a more accurate understanding of Bitcoin's energy demand were more inclined to support sustainability measures. 3) Most of this supportive cohort viewed private entities as the primary stakeholders for implementing such measures. Given these findings, we suggest that consumer education should be at the forefront of policy initiatives aimed at cryptocurrency sustainability.

    Comment: Early versions of this article were disseminated under the title "How to Make Users Adopt More Sustainable Cryptocurrencies: Evidence from Nigeria". Subsequently, the article has been renamed to "Energy Demand Unawareness and the Popularity of Bitcoin: Evidence from Nigeria", which is the title of the published version of record and the appropriate nomenclature for all citations of this work
    Keywords Computer Science - Computers and Society ; K.4.1 ; J.7
    Subject code 690
    Publishing date 2022-07-30
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Article ; Online: Dataset of five years of in situ and satellite derived chlorophyll a concentrations and its spatiotemporal variability in the Rotorua Te Arawa Lakes, New Zealand

    Eike M Schütt / Moritz K Lehmann / Martin Hieronymi / James Dare / Hajo Krasemann / Darryn Hitchcock / Amy Platt / Klay Amai / Tasman McKelvey

    Data in Brief, Vol 40, Iss , Pp 107759- (2022)

    2022  

    Abstract: Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water ... ...

    Abstract Horizontal patchiness of water quality attributes in lakes substantially influences the ability to accurately determine an average condition of a lake from traditional in situ sampling. Monitoring programmes for lake water quality often rely on water samples from one or few locations but the assumption of representativeness is seldomly tested. Satellite observations can support environmental monitoring by detecting horizontal variability of water quality attributes over entire lakes. This article is a co-submission with Lehmann et al. (2021), who present a method to create a regional calibration of a satellite chlorophyll a algorithm and a spatial analysis of an image time series to detect recurring patchiness. Our method was developed on 13 lakes in the central North Island of New Zealand and this publication makes available the data used in our analysis and the spatial fields of results. These data are immediately valuable for practitioners operating within the region of interest providing a five year archive of synoptic water quality data and spatial fields to help optimize in situ monitoring efforts. In addition, there is value to the wider scientific community as the study lakes are a useful ‘natural lab’ for the development of aquatic remote sensing methods due to the range of trophic conditions and water colour in a single satellite image scene. Together with decades of in situ water quality records, our data is therefore useful for the development and validation of widely applicable methods of water quality retrieval from satellite data.
    Keywords Lakes ; Chlorophyll ; Remote sensing ; Water quality ; Monitoring ; Spatial variability ; Computer applications to medicine. Medical informatics ; R858-859.7 ; Science (General) ; Q1-390
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  9. Article ; Online: Test, Trace, and Put on the Blockchain?: A Viewpoint Evaluating the Use of Decentralized Systems for Algorithmic Contact Tracing to Combat a Global Pandemic.

    Platt, Moritz / Hasselgren, Anton / Román-Belmonte, Juan Manuel / Tuler de Oliveira, Marcela / De la Corte-Rodríguez, Hortensia / Delgado Olabarriaga, Sílvia / Rodríguez-Merchán, E Carlos / Mackey, Tim Ken

    JMIR public health and surveillance

    2021  Volume 7, Issue 4, Page(s) e26460

    Abstract: The enormous pressure of the increasing case numbers experienced during the COVID-19 pandemic has given rise to a variety of novel digital systems designed to provide solutions to unprecedented challenges in public health. The field of algorithmic ... ...

    Abstract The enormous pressure of the increasing case numbers experienced during the COVID-19 pandemic has given rise to a variety of novel digital systems designed to provide solutions to unprecedented challenges in public health. The field of algorithmic contact tracing, in particular, an area of research that had previously received limited attention, has moved into the spotlight as a crucial factor in containing the pandemic. The use of digital tools to enable more robust and expedited contact tracing and notification, while maintaining privacy and trust in the data generated, is viewed as key to identifying chains of transmission and close contacts, and, consequently, to enabling effective case investigations. Scaling these tools has never been more critical, as global case numbers have exceeded 100 million, as many asymptomatic patients remain undetected, and as COVID-19 variants begin to emerge around the world. In this context, there is increasing attention on blockchain technology as a part of systems for enhanced digital algorithmic contact tracing and reporting. By analyzing the literature that has emerged from this trend, the common characteristics of the designs proposed become apparent. An archetypal system architecture can be derived, taking these characteristics into consideration. However, assessing the utility of this architecture using a recognized evaluation framework shows that the added benefits and features of blockchain technology do not provide significant advantages over conventional centralized systems for algorithmic contact tracing and reporting. From our study, it, therefore, seems that blockchain technology may provide a more significant benefit in other areas of public health beyond contact tracing.
    MeSH term(s) Algorithms ; Blockchain ; COVID-19 ; Contact Tracing ; Coronavirus Infections/diagnosis ; Coronavirus Infections/epidemiology ; Female ; Humans ; Male ; Privacy ; Public Health
    Language English
    Publishing date 2021-04-06
    Publishing country Canada
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2369-2960
    ISSN (online) 2369-2960
    DOI 10.2196/26460
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  10. Article ; Online: Quantitative Dynamic Oxygen 17 MRI at 7.0 T for the Cerebral Oxygen Metabolism in Glioma.

    Paech, Daniel / Nagel, Armin M / Schultheiss, Miriam N / Umathum, Reiner / Regnery, Sebastian / Scherer, Moritz / Wick, Antje / Platt, Tanja / Wick, Wolfgang / Bendszus, Martin / Unterberg, Andreas / Schlemmer, Heinz-Peter / Ladd, Mark E / Niesporek, Sebastian C

    Radiology

    2020  Volume 295, Issue 1, Page(s) 181–189

    Abstract: Background Altered metabolism is a characteristic of cancer. Because of a shift in glucose metabolism from oxidative phosphorylation to lactate production for energy generation, malignant tumors are characterized by increased glycolysis followed by ... ...

    Abstract Background Altered metabolism is a characteristic of cancer. Because of a shift in glucose metabolism from oxidative phosphorylation to lactate production for energy generation, malignant tumors are characterized by increased glycolysis followed by lactic acid fermentation, even in the presence of abundant oxygen (the Warburg effect). Purpose To quantitatively investigate dynamic oxygen 17 (
    MeSH term(s) Adult ; Aged ; Brain Neoplasms/metabolism ; Female ; Glioma/metabolism ; Gray Matter/metabolism ; Humans ; Magnetic Resonance Imaging/methods ; Male ; Middle Aged ; Oxygen/metabolism ; Oxygen Consumption ; Oxygen Isotopes ; Prospective Studies ; White Matter/metabolism ; Young Adult
    Chemical Substances Oxygen Isotopes ; Oxygen-17 ; Oxygen (S88TT14065)
    Language English
    Publishing date 2020-02-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 80324-8
    ISSN 1527-1315 ; 0033-8419
    ISSN (online) 1527-1315
    ISSN 0033-8419
    DOI 10.1148/radiol.2020191711
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Ue I Zs.106: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top