164 Works

Impact of powdered activated carbon structural properties on removal of organic foulants in combined adsorption-ultrafiltration

Martin Schulz, Sönke Bünting & Mathias Ernst
The impact of structural properties of three commercial PACs as well as two mechanically ground PACs on their efficiency in NOM removal and fouling reduction in combined adsorption-ultrafiltration (PAC-UF) of northern German groundwater was investigated. All PACs showed highest adsorption affinity for medium molecular weight NOM fractions. The meso-pore surface area rather than the total surface area (B.E.T.) mainly governed the extent of NOM removal. However, adsorption of macromolecular NOM fractions, which were found to...

Business model innovation : a case of the offshore lifting equipment supplier

Mikhail Shlopak, Richard Myhre & Gabriele Hofinger Jünge
The purpose of this paper is to present the background for and the process of development of an Internet of Things (IoT) business model (BM) for a Norwegian offshore lifting equipment supplier. The paper presents both challenges and new opportunities connected to the case company’s transition towards IoT, servicebased BM. The research methodology is a single case study research. The research approach involves four steps: theoretical discussion; a case study; analysis of the case study,...

Entwicklungstrends bei Basissystemen und ihre Wechselwirkungen zum Flugzeugentwurf : 2. Symposium Flugzeug-Systemtechnik, Workshop DGLR-Fachausschuß S2.1 "Starrflügelsysteme"

Dieter Scholz & Deutsche Gesellschaft Für Luft- Und Raumfahrt-Lilienthal-Oberth E.V. (DGLR)
Workshop am Technologiezentrum Hamburg-Finkenwerder, 15./16. September 1997, Tagungsband / Fachausschuß S2.1 Starrflügelsysteme, Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR) / 2. Symposium Flugzeug-Systemtechnik. Inhalt: Teil A: Aspekte des Gesamtflugzeugs, Teil B: Systeme und Flugzeug-Nutzung, Teil C: Systeme und Flugzeugauslegung, Teil D: Systemrepräsentanz in Flugsimulatoren

Wasserbauliche Systemanalyse zur Bewertung der Auswirkungen des Klimawandels für tidebeeinflusste Nebengewässer der Elbe

Edgar Nehlsen
Die vorliegende Arbeit behandelt drei wesentliche wasserbauliche Fragestellungen an den Nebenflüssen der Unterelbe. Diese beziehen sich auf i) den Hochwasserschutz, ii) die Morphodynamik und die morphologische Entwicklung sowie iii) die Auswirkungen des Klimawandels auf das Abflussgeschehen sowie die Morphodynamik in den tidebeeinflussten Unterläufen.

Ultimate strength of ship plating - A proof of capacity under combined in-plane loads

Richard C. Hayward
Die Arbeit beschäftigt sich mit der Notwendigkeit eines Nachweises der Plattenkapazität unter kombinierten Belastungen in der Plattenebene. Umfangreiche numerische Studien unter Nutzung der Finite-Elemente-Methode sind durchgeführt worden. Alle für den Schiffbau relevanten Lastkombinationen und Plattenkonfigurationen wurden hierbei berücksichtigt. Die Studien werden verwendet, um die Versagensmechanik der Platten zu untersuchen und bestehende Nachweise der Plattenkapazität zu bewerten. Um sowohl qualitative als auch quantitative Akzeptanzkriterien zu erfüllen, wird ein neuer Nachweis der Plattenkapazität unter kombinierten Belastungen in...

Smart logistics of organic waste collection in cities

Lorena Bearzotti, Javier Maturana & Maria Isabel Vega
Waste management is a growing problem all around the world with implications to society, environment, health and economy. In this context, the waste is considered as the last step in the consuming process. However, a smart waste management is possible by the generation of value from the garbage and the optimization of collection routes, landfills location and the determination of the transport fleet. This article addresses the problem of value generation from organic waste in...

The role of geometrically necessary dislocations in cantilever beam bending experiments of single crystals

Edgar Husser & Swantje Bargmann
The mechanical behavior of single crystalline, micro-sized copper is investigated in the context of cantilever beam bending experiments. Particular focus is on the role of geometrically necessary dislocations (GNDs) during bending-dominated load conditions and their impact on the characteristic bending size effect. Three different sample sizes are considered in this work with main variation in thickness. A gradient extended crystal plasticity model is presented and applied in a three-dimensional finite-element (FE) framework considering slip system-based...

Fretting-Korrosion modularer Hüftendoprothesen

Dennis Bünte
Early failure of total hip replacements can be caused by the release of wear products from modular junctions due to fretting-corrosion. The aim was to identify design factors that make the analyzed tapers susceptible to wear and corrosion. A quantitative analysis of wear from circular and flat taper designs for a mixed metal coupling (CoCr-TMZF) was performed. Based on the reconstruction of explanted taper geometries, individual engagement properties are determined, providing an estimate of the...

Cybersecurity in ports : a conceptual approach

Jenna Ahokas, Tuomas Kiiski, Jarmo Malmsten & Lauri Ojala
As the world is becoming increasingly digitalized, the role of cybersecurity on society is mounting. Recent cyberattacks have showed the vulnerability of critical infrastructure, including ports. The objective is to describe how cybersecurity is perceived in ports, as preparedness and regulation for cyberthreats in ports appears inadequate. The study is a conceptual analysis built upon a comprehensive literature review. The results show that regardless of the growing awareness of the issue, much work needs to...

Technische Bildung im Spannungsfeld zwischen beruflicher und akademischer Bildung : die Vielfalt der Wege zu technischer Bildung ; Referate der 11. Ingenieurpädagogischen Regionaltagung 2016 an der Technischen Universität Hamburg vom 23.–25. Juni 2016

Gudrun Kammasch, Henning Klaffke & Sönke Knutzen
Im Mittelpunkt der Tagung stand der Umgang mit den besonderen aktuellen Herausforderungen in den Ingenieurwissenschaften. Der Tagungsband umfasst, neben dem Thema Durchlässigkeit zwischen beruflicher und akademischer Bildung, auch Beiträge z. B. zu Wissensstrukturen, zu Innovationen in der Ingenieurdidaktik, zu ethischen Aspekten in der Ingenieurwissenschaften und zu digitalen Medien in der Lehre. Gemeinsam beleuchten diese Beiträge die Vielfalt der Wege zu technischer Bildung .

Versuche zur Querkrafttragfähigkeit von Stahlbetonplatten unter auflagernahen Einzellasten : Versuchsbericht

Lukas Henze & Günter Axel Rombach
Test report on a series of tests on the shear capacity and load transfer of reinforced concrete slabs without shear reinforcement under concentrated block loads.

Correction: Raman Subrahmanyam, et al. On the road to biopolymer aerogels - dealing with the solvent. Gels 2015, 1, 291–313

Subrahmanyam Raman, Pavel Gurikov, Paul Dieringer, Miaotian Sun & Irina Smirnova
The authors wish to make the following correction to their paper [1].[...]

Toward pixel-wise vision in epiretinal visual prosthesis

Diego Luján Villarreal
Visuelle Prothesen sollen das Sehvermögen von erblindeten Menschen wiederherstellen. Dies ist mit zertifizierten Sehprothesen bereits in eingeschränktem Rahmen möglich, aber für eine räumliche Wahrnehmung durch elektrisch aktivierte Zellen werden signifikante Verbesserungen benötigt. Es werden Anordnungen von Neuronen in der Retina modelliert, um Konzepte für eine Verbesserung der visuellen Wahrnehmung zu entwickeln. Neurologische Modelle und theoretische Überlegungen für eine physikalische Realisierung der Elektronik werden in die Untersuchungen einbezogen und Modellrechnungen zur Erhöhung der Elektrodenanzahl, zur Bestimmung...

Validation Approach For Occupational Standards

Henning Klaffke
Occupational Standards are the foundation for vocational and education training systems. They represent results of commitments between economy stakeholders, labour market and political settings in order to enhance vocational training. This research paper focus on a validation approach to identify the quality of occupational standards.

Data mining and fault tolerance in warehousing

Christopher Reining, Omar Bousbiba, Svenja Jungen & Michael Ten Hompel
This paper surveys the significance of data mining techniques and fault tolerance in future materials flow systems with a focus on planning and decision-making. The fundamental connection between data mining, fault tolerance, and materials flow is illustrated. Contemporary developments in warehousing are assessed to formulate upcoming challenges. In particular, the transition towards distributed systems and the increasing data volume is examined. The significance of taking fault tolerance into account is emphasized. Ultimately, research issues are...

Analyse und Verbesserung der Arbeitsproduktivität in der Unikatproduktion

Florian Tietze
This thesis develops a method for the analysis and improvement of labor productivi-ty in one-of-a-kind productions. The central element is the modeling of the paid working time with activities and objects. The classification into phases of a generic work cycle allows repeatable productivity gains. A multi-dimensional work sam-pling is the standard for the data acquisition. Based on the results, improvement ac-tivities can be systematically selected.

Eine Methode zur Bewertung von Anlaufrisiken in der Produktentwicklung für die Flugzeugindustrie

Steffen Elstner
In this thesis a methodical support for early identification and minimization of ramp-up risks with the help of response strategies is developed. Therefore the approach is divided into two main phases and focusing on the support of the product development until the transition to production. Within the first phase the identification of potential risk areas will be conducted based on a new impact model. During the second main phase the identified areas will be analyzed...

Microbial degradation of crude oil at high pressure

Martina Schedler
In dieser Arbeit wurde der Einfluss von hohem Druck auf den bakteriellen Abbau von Erdölkomponenten in Hochdruckreaktoren untersucht. Abhängig von den untersuchten Modell-Stämmen und Erdölkomponenten wurden die Fähigkeit zum Abbau derselben und das bakterielle Wachstum durch hohen Druck entweder gefördert, gehemmt oder nicht beeinflusst. Hoher Druck veränderte außerdem die Zusammensetzung der bakteriellen Gemeinschaft in Tiefsee-Sedimenten. Diese Arbeit belegt, dass der Druck großen Einfluss auf den bakteriellen Abbau von Erdöl hat und in Untersuchungen des biologischen...

Substrates and oxygen dependent citric acid production by Yarrowia lipolytica: insights through transcriptome and fluxome analyses

Wael Sabra, Rajesh Reddy Bommareddy, Garima Maheshwari, Seraphim Papanikolaou & An-Ping Zeng
Unlike the well-studied backer yeast where catabolite repression represents a burden for mixed substrate fermentation, Yarrowia lipolytica, an oleaginous yeast, is recognized for its potential to produce single cell oils and citric acid from different feedstocks. These versatilities of Y. lipolytica with regards to substrate utilization make it an attractive host for biorefinery application. However, to develop a commercial process for the production of citric acid by Y. lipolytica, it is necessary to better understand...

Numerical modelling and simulation of cavitating marine propeller flows

Maria Gaschler
A three-dimensional inviscid boundary element method for the simulation of steady and unsteady partial sheet cavitation on marine propellers is developed. The numerical method is validated in several test cases and applied to the calculation of hydrodynamic loads generated by the flow field around and behind a cavitating propeller on the surrounding structures in the port area.

Design of a cyber-physical production system for semiconductor manufacturing

Sophia Keil
Due to the highly dynamic markets, an increasing complexity, and individualization of products, efficient and robust logistical processes are difficult to achieve through the use of central planning and control approaches. The aim of the contribution is the design of a decentralized, autonomous control system for high tech production systems. An interdisciplinary perspective was adopted as methods of artificial intelligence and mechanical as well as electrical engineering were used. The results are a hardware concept...

Improving sustainability through digitalisation in reverse logistics

Sharon Cullinane, Michael Browne, Elisabeth Karlsson & Yingli Wang
Online purchases of clothes are increasing rapidly and with it, the number of returns. Return rates of clothing bought online can be up to 70%, involving high reverse logistics costs to retailers as well as sustainability costs to society. This paper seeks to illustrate how digitalisation can potentially decrease both such costs. The paper is based on a literature review and subsequent empirical research. Qualitative information was obtained through detailed interviews with key personnel and...

A conceptual modeling approach to health-related urban well-being

Malte Von Szombathely, Myriam Albrecht, Dejan Antanaskovic, Jobst Augustin, Matthias Augustin, Benjamin Bechtel, Thomas Bürk, Jana Fischereit, David Grawe, Peter Hoffmann, Giedrius Kaveckis, Anne Caroline Krefis, Jürgen Oßenbrügge, Jürgen Scheffran & Katharina Heinke Schlünzen
In cities, social well-being faces obstacles posed by globalization, demographic and climate change, new forms of social organization, and the fragmentation of lifestyles. These changes affect the vulnerability of city societies and impact their health-related urban well-being (UrbWellth). The conceptual model introduced in this paper systematizes the relevant variables while considering previous research, and establishes the target value UrbWellth. The model differs from existing approaches mainly in the analytical distinctions it suggests. These allow us...

Effect of organic matter on Cr(VI) removal from groundwaters by Fe(II) reductive precipitation for groundwater treatment

Anna Gröhlich, Margarethe Langer, Manassis Mitrakas, Anastasios I. Zouboulis, Ioannis A. Katsoyiannis & Mathias Ernst
Due to its toxicity, Cr(VI) is undesirable in groundwater. Its chemical reduction to Cr(III) species, followed by precipitation is the most widely practiced treatment technique for the removal of Cr(VI) from polluted waters. The resulting Cr(III) species present low solubility, is much less toxic, and can be subsequently removed either by precipitation, or by adsorption onto iron oxy-hydroxides and co-precipitation. The effects of several parameters, such as the pH value of water to be treated,...

Registration Year

  • 2017
    164

Resource Types

  • Text
    163
  • InteractiveResource
    1