Fak. 6 Planen Bauen Umwelt

1572 Items

Recent Submissions
Cable reverberations during wireline distributed acoustic sensing measurements: their nature and methods for elimination

Martuganova, Evgeniia ; Stiller, Manfred ; Bauer, Klaus ; Henninges, Jan ; Krawczyk, Charlotte M. (2021-05-16)

The application of distributed acoustic sensing in borehole measurements allows for the use of fibre optic cables to measure strain. This is more efficient in terms of time and costs compared with the deploying of conventional borehole seismometers. Nevertheless, one known drawback for temporary deployment is represented by the freely hanging wireline cable slapping and ringing inside the casin...

Spatial Commons versus Separate Spaces

Pelger, Dagmar (2021)

Eine relationale raumtypologische Definition von Spatial Commons als reproduktive Raumsysteme eines inklusiven und selbstbestimmten Stadtraumgebrauchs – in Abgrenzung zu Separate Spaces als abschöpfende Raumsysteme eines exklusiven und fremdbestimmten Stadraumgebrauchs – mittels kollektiv erstellter Kartierungen von Orten, Prozessen und Regelwerken des Gemeinschaffens in Freiräumen, Gewerberäume...

Urban informality: space, power and legitimacy in addressing London's housing need

Kelling, Emily (2021)

This doctoral thesis offers a relational concept of spatial informality. The concept is presented as a means to overcome a binary tendency in the urban informality debate, which the thesis identifies as a conceptual, a geographic, and an aesthetic limitation. The concept of spatial informality and its ensuing analytical framework with a focus on the negotiation of legitimacy are applied to the ...

Derivation and analysis of hydrological parameters from ground-based GNSS stations

Simeonov Simeonov, Tzvetan (2021)

The ability to measure multiple environmental parameters, such as atmospheric water vapour, soil moisture and snow height with the same hardware is the main advantage of Global Navigation Satellite System (GNSS) environmental measurements over other observation techniques. In this thesis state-of-art ground-based GNSS methods for environmental monitoring are used to derive atmospheric water vap...

fem*MAP BERLIN. Feminist spatial systems for a non-sexist city

(2021)

The project fem*MAP Berlin is the result of a research- and mapping seminar held at the Chair for Urban Design and Urbanization, TU Berlin in 2020. It aims to make visible both the inequalities which are inscribed in the spatial structures of our cities through social gender relations as well as the existing feminist spatial systems and practices of resistance by the means of critical mapping a...

Refining ionospheric delay modeling for undifferenced and uncombined GNSS data processing

Zhao, Qile ; Wang, YinTong ; Gu, Shengfeng ; Zheng, Fu ; Shi, Chuang ; Ge, Maorong ; Schuh, Harald (2018-07-31)

To access the full capabilities of multi-frequency signals from the modernized GPS, GLONASS and newly deployed BDS, Galileo, the undifferenced and uncombined observable model in which the individual signal of each frequency is treated as independent observable has drawn increasing interest in GNSS community. The ionosphere delay is the major issue in the undifferenced and uncombined observable ...

Multi-GNSS satellite clock estimation constrained with oscillator noise model in the existence of data discontinuity

Shi, Chuang ; Guo, Shiwei ; Shengfeng, Gu ; Yang, Xinhao ; Gong, Xiaopeng ; Deng, Zhiguo ; Ge, Maorong ; Schuh, Harald (2018-07-25)

During the past years, real-time precise point positioning has been proven to be an efficient tool in the applications of navigation, precise orbit determination of LEO as well as earthquake and tsunami early warning, etc. One of the most crucial issues of these applications is the high-precision real-time GNSS satellite clock. Though the performance and character of the GNSS onboard atomic fre...

Bio-Energy Management from Micro-Algae Bio-Computational Based Reactor

Heidari, Farahbod ; Saleh Tabari, Mohammad Hassan ; Mahdavinejad, Mohammadjavad ; Werner, Liss C. ; Roohabadi, Maryam (2021)

Microalgae are a sustainable source of unique properties with potential for various applications. Biofuel production has led to the use of them as bioreactors on an architectural scale. Most of these efforts cannot manage the output due to the lack of intelligent control and monitoring over environmental micro-scale growth. This research presents the possibility of control and monitoring over t...

A counterview to Lancet’s Editorial “India's COVID-19 emergency”, published on May 8, 2021

Sethi, Mahendra (2021-05)

Recently, Lancet published an editorial, “India's COVID-19 emergency”. An editorial is entitled to be opinionated, but it is expected to be based on nuanced analysis of scientific facts than merely towing to a popular media narrative. Having been tracking COVID-19 in urban centres and being on ground zero during India’s intra-wave period, I notice several inaccuracies and inconsistencies here. ...

Analyzing the early structural build-up of accelerated cement pastes

Dorn, Tobias ; Hirsch, Tamino ; Stephan, Dietmar (2021-03-10)

Extrusion-based additive manufacturing imposes high requirements on the material stability right after the extrusion. Therefore, a thorough understanding of the chemical reactions that determine the early reduction in processability is necessary. Accelerators are especially considered here, which have a major influence on the early reaction. This study contributes to these issues by analyzing t...

Comparative Evaluation of Statistical and Fractal Approaches for JRC Calculation Based on a Large Dataset of Natural Rock Traces

Marsch, Kristofer ; Fernandez-Steeger, Tomas M. (2021-02-03)

After the publication of the type-profiles for the estimation of the joint roughness coefficient (JRC) a discussion evolved about how to adequately use these traces. Based on the chart numerous researchers assembled mathematical correlations with various parameters seeking objectivity in the determination of JRC. Within these works differences concerning the database and the mathematical implem...

3D printable lightweight cementitious composites with incorporated waste glass aggregates and expanded microspheres – Rheological, thermal and mechanical properties

Cuevas, Karla ; Chougan, Mehdi ; Martin, Falk ; Ghaffar, Seyed Hamidreza ; Stephan, Dietmar ; Sikora, Pawel (2021-05-15)

One of the fields in the construction industry where 3D printing of cementitious composites can play a significant role is associated with manufacturing of lightweight structures. Thanks to 3D printing, structural self-weight can be reduced by topology optimization of printed elements. Moreover, further decrements of self-weight and improvement of thermal insulating properties can be achieved b...

Performance Evaluation of VTEC GIMs for Regional Applications during Different Solar Activity Periods, Using RING TEC Values

Tornatore, Vincenza ; Cesaroni, Claudio ; Pezzopane, Michael ; Alizadeh, Mohamad Mahdi ; Schuh, Harald (2021-04-10)

This paper presents a comparison of the vertical total electron content (vTEC) estimated over Italy using two different approaches: the GPS Global Ionosphere Maps (GIMs) and the so-called “calibration technique” developed by Ciraolo in 2007. The study has been carried out at a regional level by considering three Italian dual-frequency stations of the GPS permanent network “Rete Integrata Nazion...

Dosing Free Nitrous Acid as an Alternative Sulphide Control Technology for Pressure Sewers in Germany

Despot, Daneish ; Reinhold, Luisa ; Augustyniak, Adrian ; Barjenbruch, Matthias (2021-04-08)

Sulphide build-up in pressure sewers has been identified as the main cause for the occurrence of odour and corrosion in sewer systems. Despite the efforts to optimize commonly used control technologies such as nitrate and iron salts to reduce sulphide emission, continuous addition of these chemicals is still required. A biocidal agent such as free nitrous acid can be added intermittently, less ...

The performance of ultra-lightweight foamed concrete incorporating nanosilica

Elrahman, Mohamed Abd ; Sikora, Pawel ; Chung, Sang-Yeop ; Stephan, Dietmar (2021-04-29)

This paper aims to investigate the feasibility of the incorporation of nanosilica (NS) in ultra-lightweight foamed concrete (ULFC), with an oven-dry density of 350 kg/m3, in regard to its fresh and hardened characteristics. The performance of various dosages of NS, up to 10 wt.-%, were examined. In addition, fly ash and silica fume were used as cement replacing materials, to compare their influ...

Electron & Biomass Dynamics of Cyanothece Under Interacting Nitrogen & Carbon Limitations

Rabouille, Sophie ; Campbell, Douglas A. ; Masuda, Takako ; Zavřel, Tomáš ; Bernát, Gábor ; Polerecky, Lubos ; Halsey, Kimberly ; Eichner, Meri ; Kotabová, Eva ; Stephan, Susanne ; Lukeš, Martin ; Claquin, Pascal ; Bonomi-Barufi, José ; Lombardi, Ana Teresa ; Červený, Jan ; Suggett, David J. ; Giordano, Mario ; Kromkamp, Jacco C. ; Prášil, Ondřej (2021-04-09)

Marine diazotrophs are a diverse group with key roles in biogeochemical fluxes linked to primary productivity. The unicellular, diazotrophic cyanobacterium Cyanothece is widely found in coastal, subtropical oceans. We analyze the consequences of diazotrophy on growth efficiency, compared to NO3–-supported growth in Cyanothece, to understand how cells cope with N2-fixation when they also have to...

Knowing urban informalities

Marx, Colin ; Kelling, Emily (2019-02-01)

How do Anglophone urban scholars know urban informalities? This article reviews three dominant ways of knowing urban informality, noting that, despite the profoundly rich insights they each provide, two critiques of the overall concept endure. These are that the concept is often imprecise, and that the contribution to knowing ‘the urban’ more generally remains clearly circumscribed to the ‘urba...

Social Distancing und neue Raumformen der Interaktion. Teilstudie 3

Meinert, Leopold (2021-04-29)

Im Rahmen des Projekts wurden videografische Aufzeichnungen hergestellt, mittels derer die neuen Raum- und Interaktionsformen des „Social Distancing“ dokumentiert werden. Ziel war es, darauf aufbauend das Verständnis komplexer, kulturell und situativ organisierter Dynamiken von öffentlichen Begegnungen im Zusammenhang mit dem Infektionsgeschehen und Hygienemaßnahmen genauer zu verstehen. Die St...

Observable quality assessment of broadband very long baseline interferometry system

Xu, Ming H. ; Anderson, James M. ; Heinkelmann, Robert ; Lunz, Susanne ; Schuh, Harald ; Wang, Guangli (2021-04-12)

The next-generation, broadband geodetic very long baseline interferometry system, named VGOS, is developing its global network, and VGOS networks with a small size of 3–7 stations have already made broadband observations from 2017 to 2019. We made quality assessments for two kinds of observables in the 21 VGOS sessions currently available: group delay and differential total electron content (δT...

Improving the modeling of the atmospheric delay in the data analysis of the Intensive VLBI sessions and the impact on the UT1 estimates

Nilsson, Tobias ; Soja, Benedikt ; Balidakis, Kyriakos ; Karbon, Maria ; Heinkelmann, Robert ; Deng, Zhiguo ; Schuh, Harald (2017-01-11)

The very long baseline interferometry (VLBI) Intensive sessions are typically 1-h and single-baseline VLBI sessions, specifically designed to yield low-latency estimates of UT1-UTC. In this work, we investigate what accuracy is obtained from these sessions and how it can be improved. In particular, we study the modeling of the troposphere in the data analysis. The impact of including external i...