11 results on '"Oelmann M"'
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2. Nachhaltige Gebührenmodelle in der Abwasserentsorgung Teil 2: Zur Eignung alternativer Grundgebührenmodelle für Schmutzwasser. Sustainable models for wastewater management fees Part 2: The suitability of alternative basic fee models for wastewater
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Oelmann, M., Roters, B., Gawel, Erik, Oelmann, M., Roters, B., and Gawel, Erik
- Abstract
Die Einführung einer Grundgebühr in der Schmutzwasserentsorgung ist unter Nachhaltigkeitsgesichtspunkten vorteilhaft. Dabei kommen unterschiedliche Bemessungsgrundlagen für die Grundgebühr infrage. Der vorliegende Beitrag untersucht drei Modelle anhand von Nachhaltigkeitskriterien und unter Verwendung empirischer Daten aus drei nordrhein-westfälischen Modellkommunen. Die Zahl der Wohneinheiten erweist sich als ein geeigneter Maßstab, der sowohl robust gegenüber Schwankungen der Schmutzwassermenge als auch kostenverursachungsgerecht ist. Die Verursachungsgerechtigkeit ergibt sich aus der hohen Korrelation mit der Schmutzwassermenge, sodass kapazitätsbedingte Vorhaltekosten besser abgebildet werden können. Wichtig bei der Umstellung ist auch eine Minimierung von Friktionen gegenüber dem alten Gebührenmodell. In dieser Hinsicht ist die Wasserzählergröße als potenzielle Bemessungsgrundlage weniger leistungsfähig als das Wohneinheiten-Modell und erweist sich auch als weniger kostenverursachergerecht, sodass letzteres insgesamt empfehlenswert erscheint. Die Degression der Vorhaltekosten in Bezug auf die Wohneinheiten eines Gebäudes bedingt, dass ein leistungsproportionaler Grundgebührentarif diese Degression gerade abbilden muss. Zudem wird eine Äquivalenzregel für gewerbliche Nutzer benötigt. The introduction of a basic fee for the management of wastewateris beneficial from a sustainability standpoint. A variety of bases for assessment are feasible. This article looks at three models based on sustainability criteria and using empirical data from three sample municipalities in the German state of North Rhine-Westphalia. The number of residential units turns out to be a suitable yardstick that is robust in the face of fluctuations in the quantity of wastewater and fair in allocating costs. The fairness of allocating costs is based on the high correlation with the quantity of wastewater, meaning that capacity-related contingency costs can be better mapped. In making the con
- Published
- 2018
3. Cultivating innovation and equity in co-production of commercialized spring water in peri-urban Bandung, Indonesia
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Anindrya Nastiti, Meijerink, S. V., Oelmann, M., Smits, A. J. M., Muntalif, B. S., Sudradjat, A., and Roosmini, D.
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Co-production ,equity ,Philosophy and Science Studies ,lcsh:Hydraulic engineering ,Indonesia ,lcsh:TC1-978 ,Department of Sustainable Management of Resources ,water commercialisation ,Institute for Management Research ,innovation - Abstract
Contains fulltext : 170002.pdf (Publisher’s version ) (Open Access) This paper examines a co-production arrangement between private actors, households, and community actors occurring within the framework of scheme of commercialised spring water in peri-urban Bandung, Indonesia. We argue that the provision of spring water in Ujungberung District is a form of co-production, characterised by: (1) any one, or the elements, of the service production process being shared; (2) the presence of a fundamental shift in the balance of power between the primary producers and users/communities, and (3) the existence of mutual support and relationship networks, rather than a clearly defined delineation between providers and clients. Actor contributions defined as inputs along the value chain of spring water production were examined. We describe interactions between local private actors and community members in planning, service delivery, and conflict management with respect to disruption of water supplies, free-riding behaviour, and the geographical distribution of services. This paper identifies several institutional innovations that may yield a safer and more affordable water supply and nurture equity in the sense of: (1) improved access to water for the previously unserved people by piped water and boreholes; (2) the opportunity to negotiate from below; and (3) transparency and accountability.
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- 2017
4. Cultivating innovation and equity in co-production of commercialized spring water in peri-urban Bandung, Indonesia
- Author
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Nastiti, A., Meijerink, S.V., Oelmann, M., Smits, A.J.M., Muntalif, B.S., Sudradjat, A., Roosmini, D., Nastiti, A., Meijerink, S.V., Oelmann, M., Smits, A.J.M., Muntalif, B.S., Sudradjat, A., and Roosmini, D.
- Abstract
Contains fulltext : 170002.pdf (publisher's version ) (Open Access), This paper examines a co-production arrangement between private actors, households, and community actors occurring within the framework of scheme of commercialised spring water in peri-urban Bandung, Indonesia. We argue that the provision of spring water in Ujungberung District is a form of co-production, characterised by: (1) any one, or the elements, of the service production process being shared; (2) the presence of a fundamental shift in the balance of power between the primary producers and users/communities, and (3) the existence of mutual support and relationship networks, rather than a clearly defined delineation between providers and clients. Actor contributions defined as inputs along the value chain of spring water production were examined. We describe interactions between local private actors and community members in planning, service delivery, and conflict management with respect to disruption of water supplies, free-riding behaviour, and the geographical distribution of services. This paper identifies several institutional innovations that may yield a safer and more affordable water supply and nurture equity in the sense of: (1) improved access to water for the previously unserved people by piped water and boreholes; (2) the opportunity to negotiate from below; and (3) transparency and accountability.
- Published
- 2017
5. Nachhaltige Gebührenmodelle in der Abwasserentsorgung Teil 1: Konzeptionelle Grundlagen für Grundgebühren in der Schmutzwasserentsorgung. Models of sustainable user fees in the wastewater sector Part 1: Conceptual framework for basic fees for wastewater disposal
- Author
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Oelmann, M., Roters, B., Gawel, Erik, Oelmann, M., Roters, B., and Gawel, Erik
- Abstract
Zukunftsfeste Entgelte der Wasserwirtschaft müssen ökologisch, finanziell, ökonomisch und sozial nachhaltig sein. Diese Eigenschaften weisen einstufige, rein mengenabhängige Schmutzwassergebühren bei hohen Fixkosten durch Infrastruktur-Vorhaltung nur partiell auf. Zwar ist ein solches Gebührenmodell einfach, akzeptiert und bietet maximale Anreize zum (Schmutz-) Wassersparen, jedoch werden andere wichtige Nachhaltigkeitsdimensionen untergewichtet. Nachhaltige Gebühren führen einen angemessenen Ausgleich zwischen den Ziel-Dimensionen der Gebührengestaltung herbei. Dazu sollte das Missverhältnis zwischen Erlös- und Kostenstruktur durch die Einführung einer Grundgebühr reduziert werden. Ein solch zweistufiges Gebührenmodell verringert die Wahrscheinlichkeit einer Kostenunterdeckung (finanzielle Nachhaltigkeit), fördert effizientes Nutzungs- und Investitionsverhalten bei einer verursachungsgerechten Refinanzierung der Infrastruktur (ökonomische Nachhaltigkeit) und reduziert soziale Verwerfungen durch Gebührenerhöhungen (soziale Nachhaltigkeit). Während der vorliegende Beitrag die Sinnhaftigkeit von Grundgebühren konzeptionell diskutiert, wird sich Teil 2 mit der Ausgestaltung von Grundgebühren für die Schmutzwasserentsorgung auseinandersetzen. Teil 3 wird sich der nachhaltigen Ausgestaltung von Niederschlagswassergebühren widmen. Future-proof prices for water services ought to be ecologically, financially, economically and socially sustainable. Volumetric-only fees exhibit such characteristics just partially, considering the high costs of infrastructure provision. Admittedly, volumetric tariffs are simple, well accepted and offer incentives for wastewater saving. However, other important sustainability dimensions of pricing services are underweighted. Sustainable user fees, in contrast, may induce a reasonable balance between the competing sustainability objectives of pricing. For this purpose, the discrepancy between cost and revenue structure must be overcome by introd
- Published
- 2017
6. POLYELECTROLYTE MULTILAYERS AND THEIR INTERACTIONS
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Müller, M., primary, Meier-Haack, J., additional, Schwarz, S., additional, Buchhammer, H. M., additional, Eichhorn, K.-J., additional, Janke, A., additional, Keßler, B., additional, Nagel, J., additional, Oelmann, M., additional, Reihs, T., additional, and Lunkwitz, K., additional
- Published
- 2004
- Full Text
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7. Band 3 is the basolateral anion exchanger of dark epithelial cells of turtle urinary bladder
- Author
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Drenckhahn, D., Oelmann, M., Schaaf, P., Wagner, M., and Wagner, S.
- Abstract
The turtle urinary bladder serves as a model for collecting duct functions in the mammalian kidney. The epithelium of both the turtle bladder and the mammalian collecting duct can generate a steep gradient for H+ ions between blood and urine. Secretion of H+ into the urine is coupled to a basolateral efflux of HCO-3 that appears to be exchanged mainly against Cl-. Here we show that approximately 80% of the dark cells of the bladder contain a 110,000 relative molecular weight (Mr) analogue of the turtle erythrocyte anion exchanger, band 3. The band 3 analogue is confined to the basolateral cell surface and is absent from the apical membrane. A minor population of the dark cells (approximately 20%), which have been previously suggested to represent reverse cells that are involved in HCO-3 secretion rather than absorption, appears not to express a band 3-like anion exchanger, at either the apical or the basolateral membrane. The bladder band 3 protein is colocalized with actin and isoforms of ankyrin (200,000 Mr) and spectrin (230,000 Mr) along the basolateral membrane. Linkage of band 3 via ankyrin to the spectrin-actin lattice may restrict this anion exchanger to the basolateral membrane surface. In view of our previous observation of a band 3-like anion exchanger in the collecting duct epithelium of the rat kidney, these findings point to a common molecular basis for acid-base transport in the mammalian collecting duct and the reptilian urinary bladder.
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- 1987
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8. Cultivating innovation and equity in co-production of commercialized spring water in Peri-Urban Bandung, Indonesia
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Nastiti, A., Meijerink, S.V., Oelmann, M., and Smits, A.J.M.
- Subjects
Mineraalwater ,Integraal waterbeheer ,Indonesië ,Samenwerking - Abstract
This paper examines a co-production arrangement between private actors, households, and community actors occurring within the framework of scheme of commercialised spring water in peri-urban Bandung, Indonesia. We argue that the provision of spring water in Ujungberung District is a form of co-production, characterised by: (1) any one, or the elements, of the service production process being shared; (2) the presence of a fundamental shift in the balance of power between the primary producers and users/communities, and (3) the existence of mutual support and relationship networks, rather than a clearly defined delineation between providers and clients. Actor contributions defined as inputs along the value chain of spring water production were examined. We describe interactions between local private actors and community members in planning, service delivery, and conflict management with respect to disruption of water supplies, free-riding behaviour, and the geographical distribution of services. This paper identifies several institutional innovations that may yield a safer and more affordable water supply and nurture equity in the sense of: (1) improved access to water for the previously unserved people by piped water and boreholes; (2) the opportunity to negotiate from below; and (3) transparency and accountability.
9. A Complementary and Revised View on the N-Acylation of Chitosan with Hexanoyl Chloride.
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Reis B, Gerlach N, Steinbach C, Haro Carrasco K, Oelmann M, Schwarz S, Müller M, and Schwarz D
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- Acylation, Animals, Aquatic Organisms, Hexanols chemistry, Hydrogen-Ion Concentration, Magnetic Resonance Spectroscopy, Spectroscopy, Fourier Transform Infrared, Chitosan chemistry
- Abstract
The modification of the biobased polymer chitosan is a broad and widely studied field. Herein, an insight into the hydrophobization of low-molecular-weight chitosan by substitution of amino functionalities with hexanoyl chloride is reported. Thereby, the influence of the pH of the reaction media was investigated. Further, methods for the determination of the degree of substitution based on
1 H-NMR, FTIR, and potentiometric titration were compared and discussed regarding their accuracy and precision.1 H-NMR was the most accurate method, while FTIR and the potentiometric titration, though precise and reproducible, underlie the influence of complete protonation and solubility issues. Additionally, the impact of the pH variation during the synthesis on the properties of the samples was investigated by Cd2+ sorption experiments. The adjusted pH values during the synthesis and, therefore, the obtained degrees of substitution possessed a strong impact on the adsorption properties of the final material.- Published
- 2021
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10. Development and prospects of standardization in the German municipal wastewater sector.
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Freimuth C, Oelmann M, and Amann E
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Given the significance of wastewater treatment and disposal for society and the economy together with the omnipresence of standards in the sector, we studied the development and prospects of the rules governing standardization in the German municipal wastewater sector. We thereby provide a detailed description of sector-specific committee-based standardization and significantly contribute to the understanding of this complex arena. We find that the German Association for Water Wastewater and Waste (DWA) has significantly improved its rules on standardization over time by aligning them closer to the generally accepted superordinate standardization principles. However, by focusing on theoretical findings of committee decision-making and committee composition, we argue that there is still scope for improvement with respect to rule reading and rule compliance. We show that the incentives at work in standardization committees are manifold, whereas the representation of the different stakeholder groups needs' remains unbalanced. Due to vested interests and potential strategic behavior of the various agents involved in standardization rule compliance does not necessarily happen naturally. To this end, we claim that the implementation of monitoring mechanisms can be a significant contribution to the institutional design of standardization and briefly discuss the advantages and disadvantages of different schemes. Finally, we show that there is ample need for future research on the optimal design of such a scheme. Even though the analysis relates specifically to the DWA our claims apply to a wide range of standards development organizations., (Copyright © 2018 Elsevier B.V. All rights reserved.)
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- 2018
- Full Text
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11. Surface Functionalization by Stimuli-Sensitive Microgels for Effective Enzyme Uptake and Rational Design of Biosensor Setups.
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Sigolaeva LV, Pergushov DV, Oelmann M, Schwarz S, Brugnoni M, Kurochkin IN, Plamper FA, Fery A, and Richtering W
- Abstract
We highlight microgel/enzyme thin films that were deposited onto solid interfaces via two sequential steps, the adsorption of temperature- and pH-sensitive microgels, followed by their complexation with the enzyme choline oxidase, ChO. Two kinds of functional (ionic) microgels were compared in this work in regard to their adsorptive behavior and interaction with ChO, that is, poly( N -isopropylacrylamide- co - N -(3-aminopropyl)methacrylamide), P(NIPAM- co -APMA), bearing primary amino groups, and poly( N -isopropylacrylamide- co - N -[3-(dimethylamino) propyl]methacrylamide), P(NIPAM- co -DMAPMA), bearing tertiary amino groups. The stimuli-sensitive properties of the microgels in the solution were characterized by potentiometric titration, dynamic light scattering (DLS), and laser microelectrophoresis. The peculiarities of the adsorptive behavior of both the microgels and the specific character of their interaction with ChO were revealed by a combination of surface characterization techniques. The surface charge was characterized by electrokinetic analysis (EKA) for the initial graphite surface and the same one after the subsequent deposition of the microgels and the enzyme under different adsorption regimes. The masses of wet microgel and microgel/enzyme films were determined by quartz crystal microbalance with dissipation monitoring (QCM-D) upon the subsequent deposition of the components under the same adsorption conditions, on a surface of gold-coated quartz crystals. Finally, the enzymatic responses of the microgel/enzyme films deposited on graphite electrodes to choline were tested amperometrically. The presence of functional primary amino groups in the P(NIPAM- co -APMA) microgel enables a covalent enzyme-to-microgel coupling via glutar aldehyde cross-linking, thereby resulting in a considerable improvement of the biosensor operational stability.
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- 2018
- Full Text
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