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Institute
- Fakultät AuL (488) (remove)
Naturentfremdung
(2018)
In this paper, we evaluate the application of Bayesian Optimization (BO) to discrete event simulation (DES) models. In a first step, we create a simple model, for which we know the optimal set of parameter values in advance. We implement the model in SimPy, a framework for DES written in Python. We then interpret the simulation model as a black box function subject to optimization. We show that it is possible to find the optimal set of parameter values using the open source library GPyOpt. To enhance our evaluation, we create a second and more complex model. To better handle the complexity of the model, and to add a visual component, we build the second model in Simio, a commercial off-the-shelf simulation modeling tool. To apply BO to a model in Simio, we use the Simio API to write an extension for optimization plug-ins. This extension encapsulates the logic of the BO algorithm, which we deployed as a web service in the cloud.
The fact that simulation models are black box functions with regard to their behavior and the influence of their input parameters makes them an apparent candidate for Bayesian Optimization (BO). Simulation models are multivariable and stochastic, and their behavior is to a large extent unpredictable. In particular, we do not know for sure which input parameters to adjust to maximize (or minimize) the model’s outcome. In addition, the complex models can take a substantial amount of time to run.
Bayesian Optimization is a sequential and self-learning algorithm to optimize black box functions similar to as we find them in simulation models: they contain a set of parameters for which we want to identify the optimal set, they are expensive to evaluate, and they exhibit stochastic noise. BO has proven to efficiently optimize black box functions from varius disciplines. Among those, and most notably, it is successfully applied in machine learning algorithms to optimize hyperparameters.
SimBO is a flexible framework for optimizing discrete event-driven simulations (DES) using sequential optimization algorithms. While specifically designed for Bayesian Optimization (BO) in the context of DES, SimBO can be applied to any black-box problem with other optimization algorithms. The framework consists of four encapsulated components - the black-box problem, the sequential optimization algorithm, a database for experiment configuration and results, and a web-based graphical user interface - that communicate via well-defined interfaces. Each component can be run in different environments, allowing for cooperation between different hardware- and software configurations. In our research context, SimBO’s architecture enabled BO algorithms to be run on a high-performance cluster with GPU support, while the simulation is executed on a local Windows machine using the Simio simulation software. The framework’s flexibility also makes it suitable for evolving from a research-focused tool to a production-ready, cloud-based optimization tool for modern algorithms.
The present study investigates consumers’ acceptance of Se-biofortified apples, as well as Se health and nutrition claims that have been approved by the European Commission. Despite indications that such statements are more likely to be accepted if the carrier product itself has a healthy image, unprocessed fruits biofortified with Se have not been investigated in this context yet. Apples as the most frequently-consumed type of fresh fruit in Germany may offer the potential to improve the Se status of consumers when the produce is enriched with Se. Therefore, an online survey of 356 German adults was conducted to analyze different aspects that could affect the perception of and preference for the proposed product concept by consumers. The findings indicate a moderate acceptance of Se-biofortified apples, as well as of Se health and nutrition claims among the participants. Additional information about beneficial health effects of Se had a significant impact on consumer acceptance. People who regularly eat convenience food and prefer to buy apples at supermarkets were particularly attracted by the product idea. In conclusion, the results of the study indicate good prospects for a successful introduction of Se-rich apples in the German food market, if the produce is advertised with approved health and nutrition claims.
Wie sieht die Essensversorgung von Senioren in der Zukunft aus? : Zukunftsstudie Menüservice 2025
(2016)
Fütterung von Zuchtstuten
(2023)
Fütterung von Jungpferden
(2023)
Fütterung von Zuchtstuten
(2022)
Fütterung von Jungpferden
(2022)
The break-up of the Soviet Union in 1991 triggered cropland abandonment on a continental scale, which in turn ledto carbon accumulation on abandoned land across Eurasia. Previous studies have estimated carbon accumulationrates across Russia based on large-scale modelling. Studies that assess carbon sequestration on abandoned land basedon robust field sampling are rare. We investigated soil organic carbon (SOC) stocks using a randomized samplingdesign along a climatic gradient from forest steppe to Sub-Taiga in Western Siberia (Tyumen Province). In total, SOCcontents were sampled on 470 plots across different soil and land-use types. The effect of land use on changes in SOCstock was evaluated, and carbon sequestration rates were calculated for different age stages of abandoned cropland.While land-use type had an effect on carbon accumulation in the topsoil (0–5 cm), no independent land-use effectswere found for deeper SOC stocks. Topsoil carbon stocks of grasslands and forests were significantly higher thanthose of soils managed for crops and under abandoned cropland. SOC increased significantly with time sinceabandonment. The average carbon sequestration rate for soils of abandoned cropland was 0.66 Mg C ha1yr1(1–20 years old, 0–5 cm soil depth), which is at the lower end of published estimates for Russia and Siberia. Therewas a tendency towards SOC saturation on abandoned land as sequestration rates were much higher for recentlyabandoned (1–10 years old, 1.04 Mg C ha1yr1) compared to earlier abandoned crop fields (11–20 years old,0.26 Mg C ha1yr1). Our study confirms the global significance of abandoned cropland in Russia for carbonsequestration. Our findings also suggest that robust regional surveys based on a large number of samples advancemodel-based continent-wide SOC prediction.
Den autochthonen Baumarten geht es unter den klimatischen Veränderungen des Klimawandels so- wohl in der freien Landschaft als auch im urbanen Raum zunehmend schlechter (vgl. fIetz & burger 2021; mlV.nrW 2022). Gleichzeitig können in natürlichen Waldökosystemen Anpassungsdynamiken an diese veränderten klimatischen Bedingungen im Rahmen der Laurophyllisierung beobachtet werden, bei dem sich die mitteleuropäischen sommergrünen Laubwälder in teilweise immergrünen Hartlaubwaldgesell- schaften entwickeln (s. frey et al. 2010: 41). Grund hierfür sind die klimatischen Veränderungen bedingt durch den Klimawandel und Gartentrends (s. berger 2008; deHnen-scHmutz et al. 2006). Der Klimawandel scheint daher günstige Bedingungen für wärmebedürftige und frostempfindliche Immergrüne zu bieten, die an die zu erwartenden Klimaten gut angepasst sind (s. WIttIg 2008: 20). Die Immergrünen, durch die der Prozess der Laurophyllisierung maßgeblich beeinflusst wird, haben ihr natürliches Verbreitungsgebiet überwiegend in der subtropischen vollhumiden Klimazone. Das Klimaxstadium dieser Klimate ist ein im- mergrüner Lorbeerwald, der als Zonobiom V zusammengefasst wird (s. brecKle & rafIqPoor 2019).
Auch in deutschen Städten ist eine solche Anpassung der Stadtbäume an sich ändernde klimatische Bedingungen notwendig. Neben dem Klimawandel spielt im urbanen Raum das Stadtklima eine wich- tige Rolle, welches die Standortbedingungen der Pflanzen zusätzlich beeinflusst und die Auswirkungen des Klimawandels verstärkt (s. HennInger & Weber 2020; WeIscHet & endlIcHer 2018; Kuttler 1998). Die vorlie- gende Arbeit soll daher untersuchen, inwiefern sich die Herkünfte der Arten, die am Prozess der Lauro- phyllisierung beteiligt sind, für die Verwendung im städtischen Raum eignen und somit beantworten, inwiefern die Laurophyllisierung eine Chance für die klimaresiliente Gehölzverwendung in der Stadt dar- stellen kann.
Dafür werden die unterschiedlichen Baumstandorte einer Stadt anhand thermischer und hygrischer Verhältnisse zu schematischen Baumstandorttypen zusammengefasst. Während sich durch die ther- mischen Verhältnisse vor allem zentral und dezentral gelegene Baumstandorttypen differenzieren las- sen, trennen die hygrischen Verhältnisse naturnahe Baumstandorttypen von Baumstandorttypen mit eingeschränktem Wurzelraum. Für diese vier Baumstandorttypen wird dann für vier unterschiedliche Städte Deutschlands das zukünftige Mikroklima mithilfe des RCP8.5 in Form eines Klimadiagramms er- mittelt. Durch die differenzierte Auswahl der Untersuchungsgebiete Hamburg, Düsseldorf, München und Berlin können so Aussagen zu regionalen Auswirkungen des Klimawandels getroffen werden. Zudem dienen die Klimadiagramme der unterschiedlichen Baumstandorttypen als Grundlage für den klimati- schen Vergleich mit den Klimaten der Herkünfte der immergrünen Arten des Zonobiom V. Anhand die- ses Vergleiches können Subzonobiome ausfindig gemacht werden, die mehr oder weniger dem Klima der Baumstandorttypen entsprechen. Eines der Subzonobiome, welches eine gute klimatische Referenz darstellt, wird anschließend im Hinblick auf die prägnantesten immergrünen Arten näher betrachtet. Die Auswahl in dieser Arbeit ist auf das sommerregengeprägte Subzonobiom Ost-Asiens gefallen, aus dem insgesamt 20 immergrüne Laubbaumarten, neun Koniferen und eine Palmenart in Form von Steck- briefen näher beschrieben und auf die Eignung für die Verwendung innerhalb der Mirkoklimate der vier Baumstandorttypen eingeschätzt werden.
Iron deficiency is still widespread as a major health problem even in countries with adequate food supply. It mainly affects women but also vegans, vegetarians, and athletes and can lead to various clinical pictures. Biofortification of vitamin C-rich vegetables with iron may be one new approach to face this nutritional challenge. However, so far, little is known about the consumer acceptance of iron-biofortified vegetables, particularly in developed countries. To address this issue, a quantitative survey of 1000 consumers in Germany was conducted. The results showed that depending on the type of vegetable, between 54% and 79% of the respondents were interested in iron-biofortified vegetables. Regression analysis showed a relationship between product acceptance, gender, and area of residence. In addition, relationships were found between consumer preferences for enjoyment, sustainability, and naturalness. Compared to functional food and dietary supplements, 77% of respondents would prefer fresh iron-rich vegetables to improve their iron intake. For a market launch, those iron-rich vegetables appear especially promising, which can additionally be advertised with claims for being rich in vitamin C and cultivated in an environmentally friendly way. Consumers were willing to pay EUR 0.10 to EUR 0.20 more for the iron-biofortified vegetables.
Iron deficiency is a global issue and can lead to a variety of clinical pictures. The biofor-tification of vegetables with iron could complement the existing portfolio of iron-rich products, thus improving iron supply in the long term. In order to determine whether the iron-biofortified vegetables could meet this demand and would address appropriate target groups, a quantitative online survey was conducted in Germany. Based on 1000 consumer responses, a cluster analysis was performed. The results showed a four-cluster solution. The first cluster was holistically engaged, the second was fitness-affine but health unconcerned, the third cluster consists frugal eaters with a focus on medical prevention, and the fourth cluster are hedonists. No cluster focused its consumption on iron-enriched products, but instead all developed an individual mix of the three product groups.
Perceptions of German consumers regarding methods for fortifying foods with iodine (Abstract)
(2022)
After foundation of the Wadden Sea National Park, grazing and artificial drainage was ceased or reduced on large areas of the salt marshes at the Schleswig-Holstein mainland coast (Northern Germany). The effect of grazing cessation versus intensive and moderate grazing on vegetation diversity was studied on small (plant species richness on plots between 0.01 and 100 m2) and large scale (vegetation type richness per hectare) over 18 to 20 years by analysing data from long-term monitoring programs. Plant species richness and vegetation type richness increased strongly over time in all management regimes, because grazing-sensitive species increased first in ungrazed marshes and later dispersed to and established in intensively grazed marshes. Dominance of the tall, late-successional grass Elymus athericus on 7% to 52% of all moderately and ungrazed (primarily high marsh) plots led to a decrease in species richness. After 18 to 20 years, species richness was highest in moderately and intensively grazed high marshes. Differences were significant only on small plots of up to 4 m2. On the large scale, vegetation type richness in the low marsh was higher without grazing, while no differences were found in the high marsh. Our results indicate that grazing effects differ between spatial scales and that different spatial scales have to be considered for monitoring and evaluation of vegetation diversity in salt marshes. To conserve vegetation diversity on all scales, a large-scale mosaic of different management regimes should be maintained.
In der vorliegenden Arbeit wird die Anwendung eines Schlitzplatten-Mikromischers zur Produktion von O/W-Emulsionen in der Lebensmittelindustrie untersucht. Das verwendete System besteht aus dem Modularen MikroReaktions System (MMRS) der Firma Ehrfeld BTS, einer Mahr Mikrozahnradpumpe, einer HNPM Mikrozahnringpumpe, einer Temperiervorrichtung und Kapillaren zur Verbindung der einzelnen Komponenten. Zur Beurteilung des Emulgierergebnisses wird die Tropfengröße der Öltröpfchen mithilfe eines Malvern Mastersizers 2000 bestimmt. Hierzu erfolgt zunächst eine Identifikation der relevanten Prozessparameter. Mithilfe einer ausführlichen Evaluation der Mischgeometrie, der Geschwindigkeit der Fluide und der Ölkonzentration können die Effekte und Wechselwirkungen herausgearbeitet werden. Alle hergestellten Emulsionen weisen eine bimodale Tropfengrößenverteilung auf. Dennoch kann festgestellt werden, dass die Geschwindigkeit, dicht gefolgt von der Konzentration, den größten Einfluss auf das Emulgierergebnis hat. Hierbei kann die Geschwindigkeit analog zum Energieeintrag betrachtet werden. Eine weiterführende Untersuchung der Parameter Temperatur und Energieeintrag zeigt, dass die Temperatur einen starken Einfluss auf das Emulgierergebnis hat. Die Versuchsergebnisse zeigen bei einer Prozesstemperatur von 75 °C eine monomodale Tropfengrößenverteilung mit einem Tropfendurchmesser von d90,3= 6,07 µm und d3,2= 2,28 µm. Die Untersuchung der Energieeinträge erfolgt in beiden Phasen getrennt voneinander. Es ist nicht möglich, eine klare Aussage über diese Einflüsse zu machen. Als Anwendungsbeispiel für die Lebensmittelindustrie wird die Evaluation unterschiedlicher lebensmitteltauglicher Emulgatoren gewählt. Als Emulgatoren dienen enzymatisch modifiziertes Sojalecithin, Milchphospholipide auf einem Träger, Polysorbat 80 und SDS. Die Untersuchung erfolgt bei drei unterschiedlichen Temperaturen und einem konstanten Energieeintrag. Es ergibt sich eine klare Abhängigkeit der Emulgatorwirkung von der Temperatur. Alle lebensmitteltauglichen Emulgatoren weisen im Temperaturbereich von 25 °C bis 65 °C eine bimodale Tropfengrößenverteilung auf. Der Vergleich der Versuchsergebnisse mit herkömmlichen Emulgierverfahren macht deutlich, dass ein großes Potential in der Anwendung eines Schlitzplatten-Mikromischers in der Lebensmittelindustrie liegt. Im Vergleich zur Literatur ergeben sich bei der Anwendung des MMRS bei gleichen Energieeinträgen ähnlich Tropfengrößen wie bei Membranemulgierverfahren.
Chitin is an abundant waste product from shrimp and mushroom industries and as such, an appropriate secondary feedstock for biotechnological processes. However, chitin is a crystalline substrate embedded in complex biological matrices, and, therefore, difficult to utilize, requiring an equally complex chitinolytic machinery. Following a bottom-up approach, we here describe the step-wise development of a mutualistic, non-competitive consortium in which a lysine-auxotrophic Escherichia coli substrate converter cleaves the chitin monomer N-acetylglucosamine (GlcNAc) into glucosamine (GlcN) and acetate, but uses only acetate while leaving GlcN for growth of the lysine-secreting Corynebacterium glutamicum producer strain. We first engineered the substrate converter strain for growth on acetate but not GlcN, and the producer strain for growth on GlcN but not acetate. Growth of the two strains in co-culture in the presence of a mixture of GlcN and acetate was stabilized through lysine cross-feeding. Addition of recombinant chitinase to cleave chitin into GlcNAc2, chitin deacetylase to convert GlcNAc2 into GlcN2 and acetate, and glucosaminidase to cleave GlcN2 into GlcN supported growth of the two strains in co-culture in the presence of colloidal chitin as sole carbon source. Substrate converter strains secreting a chitinase or a β-1,4-glucosaminidase degraded chitin to GlcNAc2 or GlcN2 to GlcN, respectively, but required glucose for growth. In contrast, by cleaving GlcNAc into GlcN and acetate, a chitin deacetylase-expressing substrate converter enabled growth of the producer strain in co-culture with GlcNAc as sole carbon source, providing proof-of-principle for a fully integrated co-culture for the biotechnological utilization of chitin.
Species dispersal, establishment, and assembly are crucial stages of the life history of plants, and clear understanding ofthe governing forces and rules that shape species composition in a particular community is vital for successful ecologicalrestoration. In this article, we focus on five aspects of seed dispersal and plant establishment, which should be consideredduring habitat restoration actions. In the first two sections, we discuss the success of spontaneous dispersal and establishmenton restoration based on either spatial dispersal or local seed banks. In the third section, we assess the possibilities ofspecies introduction and assisted dispersal. In the fourth section, we introduce some possibilities for the improvement ofestablishment success of spontaneously dispersed or introduced species. Finally, we highlight issues influencing long-termpersistence and sustainability of restored habitats, related to the alteration of management type and intensity, climate change,and spread of non-native species. With the present article, we introduce the special issue entitled “Seed dispersal and soil seedbanks – promising sources for ecological restoration” containing 15 papers by 62 authors from 10 countries arranged in theabovementioned five topics.
Besides yield reduction weeds have positive effects, like enhancing biodiversity or reducing soil erosion. The aim of the work is to enhance biodiversity without yield losses. In growing season 2021/22 a field experiment with winter triticale was conducted to experience the impact of mechanical weed control, sowing date and sowing rate. Especially hoeing had a positive impact on vegetative growth and grain yield while weed growth was inhibited but weed biodiversity stayed equal or increased. A lower seed rate or an earlier sowing date made in general no difference at flowering or harvesting stage.