447 research outputs found
Derivation of robust predictor variables for modelling urban shrinkage and its effects at different scales
No full textCurrently, we observe diverging processes of growth and shrinkage in European Cities. Whereas in the 80ies and 90ies partially accelerated through the crash of the socialist system mostly urban growth and suburban development occurred in European Cities, today we find a general decline of population as well as an increase of aged people (as results of the demographic change in Europe and worldwide, Cloet 2003, Lutz 2001). These processes influence land use pattern (state of the environment) and land use changes in urban areas enormously. Land use pattern reflect the current socio-economic development of an urban area and give an idea of how the urban ecosystem is influenced by man. In doing so, for instance, surface sealing reduces the filtering and remediation capacity of soils and the water retention in general as well as minimises habitat quality for wetland species. At the same time, the ecosystem(s) provide so-called ecosystem services, benefits people obtain from ecosystems: water availability, drinking water, remediation and filtering of waste, places to settle, recreation facilities in nature and others. Their quantification enables to bring the change (availability/loss) of ecosystem services into relation with effective costs (economic sphere, Farber 2002, De Groot et al. 2002). The above mentioned population decline and related shrinkage processes will have enormous consequences on the demand and availability of ecosystem services needed to sustain a high and even increasing status of quality of life for European citizens in the next future. Therefore, the predictor variables describing on the one hand shrinkage-related land use changes and on the other its effects are most important but at the same time it is still a challenge; to extract such predictor variables from a huge catalogue of urban socio-economic and environmental indicators elaborated by many studies for different landscape types and scales; to derive relevant digital and spatially explicit data as model input to calculate the effects of land use (change) and; to validate the model results at the city and the quarter level (scale) as well as to prove the response of the (gained/released) ecosystem service (environmental quality) at the city and at quarter level (closing the circle). Here, the author will give some expressive examples showing the derivation of predictor variables for modelling peri-urban growth and inner city shrinkage as well as its effects on water balance, habitat quality (urban green network) and recreational space. Of major interest is the approach of how to tackle the problem of urban shrinkage in spatially explicit land use (change) modelling (Haase et al. 2004).
Öko-Ackerbohnen fehlte wieder das Wasser
No full textDer Kornertrag der geprüften Ackerbohnensorten lag 2019 unter dem langjährigen Mittel, auch wenn die Ertragseinbußen in Folge der Trockenheit nicht so stark waren wie 2018. Dr. Thorsten Haase vom Ökoteam des Landesbetriebes Landwirtschaft Hessen (LLH) beleuchtet in diesem Artikel das Ertragspotenzial neuerer Sorten unter Bedingungen des ökologischen Anbaus.Publisher: Landwirtschaftliches Wochenblatt, 4/2020
https://www.lw-heute.de/oeko-ackerbohnen-fehlte-wieder-wasse
TextGridRep: Manual architecture, installation, expandability (R 1.2.2) : work package 1 ; TextGrid - virtual research environment for the humanities ; project duration: June 2009 - May 2012
No full textDouglas Justin Haase Graduate Recital
No full textThis graduate project provides extensive program notes for a graduate-level vocal recital provided by this author in 2022, which examines the different archetypes of love, as theorized by John Alan Lee's 1977 book The Colors of Love. The solo vocal works presented herein by Gaetano Donizetti, Gabriel Fauré, Erich W. Korngold, Benjamin Britten, Stephen Sondheim, and Barry Manilow provide a variety of male perspectives varying in age, nationality, and musical time period. Each selection of repertoire is examined to determine the appropriate love typologies used, based on the historical context of each composer, the compositional background, theoretical composition or musical devices, and perceived characteristics of each singer-character. Selections by Gaetano Donizetti (1797-1848) and Gabriel Fauré (1845-1924) provide variance of nationality, Donizetti being Italian and Fauré French, and male perspective from the 19th century. Erich Korngold (1897-1957) also provides national variance by being Austrian-born and eventually composing for Hollywood films. His set of songs also provides another variance in that they were composed in his pubescent years, unlike Donizetti and Fauré's pieces which come from their more mature years. Benjamin Britten (1913-1976), Stephen Sondheim (1930-2021), and Barry Manilow (1943-present) all lived homosexual lifestyles, which brings a different and invaluable perspective of musical writing from a creative stance where the composers have little to no sexual interest in the opposite sex. Britten, unlike Sondheim and Manilow, was an English composer and his work examined here emerged in his later years, a time when he focused on the close of his life and not the early years of a budding romance. Sondheim and Manilow help in bridging the gap not only in the years between Britten's composition and today but also in the classical genre of music with commercial music for contemporary audiences. All songs in performance can be greatly enriched by understanding the context for which songs are written, the historical background of the composers, and the compositional techniques used when writing the piece. Love songs require an additional layer. The conclusion herein presents a spectrum of love typologies and combinations to study and understand the different love typologies so artists can incorporate these ideologies into performance, which can enrich the interpretation of the music.by Douglas Justin Haas
Agronomic strategies for the organic cultivation of potatoes for processing into high quality French fries and potato chips
No full textIn order to achieve the successful cultivation of potato raw material to be processed into French fries and crisps, the high quality standards set by the processing industry have to be fulfilled and high tuber yields attained. In a cooperative research project, different strategies for the cultivation of high quality potato raw material for processing were examined under the conditions of organic farming.
The choice of variety was found to be the most important agronomic instrument for the organic farmer to secure high tuber yields and quality. Varieties Agria and Marena can be recommended as they gave high tuber yields of the required size grade and also high French fry quality both at harvest and after storage. With regard to processing into crisps, cv. Marlen is highly suitable because it was observed to have good quality of raw material even after storage. On the other hand the level of reducing sugars in tubers exceeded the maximum tolerable concentration in relation to the maturity stage at lifting.
Furthermore, results confirm that any available agronomic measure to improve nutrient and water availability, but also seed-tuber treatment, has to be exploited in order to secure high yields at a satisfying quality level. Leguminous crops (field peas (Pisum sativum L.) with a following catch crop and ryegrass-clover leys) can be recommended as preceding crops. The management of ryegrass-clover leys (cutting or mulching) does not have a significant impact on tuber yield, grading or quality. Agronomic measures did influence processing quality, yet the impact of the weather conditions on crop development was much more important.
In summary, it can be stated that organic potatoes for processing can be cultivated successfully when site- and farm-specific conditions are considered
Get on your boots: estimating root biomass and rhizodeposition of peas under field conditions reveals the necessity of field experiments
No full textI have the touch – evidence for considerable N transfer from peas to oats by rhizodeposition
No full textAbstract Aims The current study quantified the carbon (C) and nitrogen (N) transfer from peas to oats under field conditions to assess the effects of intercropping. The data obtained were compared with previously published pot and field experiments. Methods Pea ( Pisum sativum L. cv. Santana) and oat ( Avena sativa L. cv Dominik) plants were grown as intercrops for 105 days. Pea plants were labelled with a solution of 2% 13 C glucose (99 atom%) and 0.5% 15 N urea (95 atom%), using the cotton wick technique. Results Pea rhizodeposits reached 540 kg C ha −1 and 17 kg N ha −1 . CdfR (C derived from rhizodeposition) and NdfR corresponded to a proportion of 18.2 and 12.7%, respectively, of total pea biomass C and N. In the intercropped oat plants, only 0.6% of the total pea CdfR amount was found, but nearly 30% of the total pea NdfR amount. Conclusions CdfR and NdfR as proportion of total pea biomass C and N, respectively, were 2.5 times higher in peas intercropped with oat plants than in sole-cropped pea plants, comparing the current results with those from previously published pot and field experiments. Future studies on intercropping should consider root formation and rhizodeposition more often
Synchronisierung von Erhebungsinstrumenten zur Erfassung des dynamischen Nachrichtenprozesses am Beispiel der Krisenkommunikation
No full textUnter Triangulation wird die Verwendung verschiedener Herangehensweisen verstanden, um ein und dasselbe Phänomen zu analysieren und zu beschreiben (vgl. Benoit & Holbert 2008; Flick 2008; Brewer & Hunter 2006; Paus-Haase 2000). Dabei ist es möglich, verschiedene Datenquellen zu nutzen (Datentriangulation), im Rahmen der Datenerhebung verschiedene Methoden zu verwenden (Methodentriangulation), die Ergebnisse im Lichte verschiedener theoretischer Ansätze zu betrachten (Theorientriangulation) oder die Beobachtungen mehrerer Wissenschaftler im Rahmen einer Studie systematisch zu vergleichen (Forschertriangulation). „Vereinfacht ausgedrückt bezeichnet der Begriff der Triangulation, dass ein Forschungsgegenstand von (mindestens) zwei Punkten aus betrachtet – oder konstruktivistisch formuliert: konstituiert – wird“ (Flick 2008, 11). Diese Kombinationen von Daten, Methoden, Theorien oder wissenschaftlichen Beobachtern sollen es ermöglichen, die Vielschichtigkeit von (sozialen) Phänomenen und die Multideterminiertheit von (menschlichem) Verhalten angemessen zu reflektieren (vgl. Brunswik 1956; Brunswik 1934)
Lowering lasing threshold in ferroelectric liquid crystal sandwiched between dielectric multilayers
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yuko Matsuhisa, Wolfgang Haase, Akihiko Fujii, and Masanori Ozaki, Appl. Phys. Lett. 89, 201112 (2006) and may be found at https://doi.org/10.1063/1.2369539.The authors have investigated laser action in ferroelectric liquid crystal (FLC) sandwiched between dielectric multilayers composed of SiO2 and TiO2. The single-mode laser action was observed at the band edge of FLC. The lasing threshold was much lower than that of simple FLC because of the double optical confinement caused by the sandwich structure. They have also demonstrated the tuning of lasing wavelength by applying an electric field. This work is partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan
On quantum state conversion in the constrained two-qubit system and its application to a reduced Rydberg-trimer model
No full textPreparing quantum states is essential for quantum information processing
since any process must start at a well-defined initial state.
State conversion describes techniques to transform a specific initial- into a predefined target state.
This dissertation investigates quantum state conversion for two interacting qubits and its specialization to a constrained system where only adjacent levels are connected. Furthermore, it shows its applicability in a system of three qubits supposed to model interacting Rydberg atoms.
A general Lie-algebraic approach is discussed, allowing a wide range of unitary transformations of the interacting two-qubit system to be described by two independent pseudospin degrees of freedom. Although restricting the representable transformations, the approach offers a simple description of many different conversion schemes and is well-suited to discuss the mentioned constrained situation.
For this constrained Hamiltonian, a specific state conversion scheme
is developed, which can be adopted in a reduced system of three qubits. These three qubits are supposed to model a Rydberg-atom
trimer, and the developed conversion scheme maps onto the transformation
between the three-atomic W state and the corresponding
Greenberger-Horne-Zeilinger state. This mapping is achieved by reducing
the eight-dimensional system to an effective four-level system.
Two possible reduction schemes are presented. One depends on
phase-matching conditions and the other on lifting degeneracies and employing multiple separated time scales in the eight-dimensional
dynamics. The control over the atomic ensemble is established via the
interaction with coherent states of the electromagnetic field.
All topics are presented in the framework of quantum optics which
is the theoretical foundation of much of the developing field of quantum
technologies.
The presented research shows how to design quantum state conversion
protocols for two interacting qubits and apply such conversion
protocols to more complex systems by employing reduction schemes.
These reduction schemes allow for an effective description by lowering
the dimension of the considered dynamics. The presented W to
Greenberger-Horne-Zeilinger state conversion protocol in the Rydbergtrimer
model outperforms previously proposed solutions for the same
task
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