Albert Einstein's Weekend Home; Caputh, near Berlin Architecture; Residences; Exterior

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Deck; Albert Einstein's Weekend Home; Caputh, near Berlin Architecture; Residences; Exterior

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View from Deck; Albert Einstein's Weekend Home; Caputh, near Berlin Architecture; Residences; Exterior

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Elsa Einstein with unidentified woman sitting on the porch of Albert Einstein's Weekend Home; Caputh, near Berlin Architecture; Residences; Exterior

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Gottschalk residence; Zeppelinstrasse 2, Hannover, Germany. architecture residences

Verso: Possibly the Gottschalk house at Zeppelinstrasse 2 in Hannover, Germany, dated 1911. Removed from an unknown scrapbook.

Interior of Aenny Catzenstein's apartment; Onslo Court (?), London Architecture Residences Interior

Aenny Catzenstein is seen sitting on a sofa in the left corner of the picture

Interior of Aenny Catzenstein's apartment; Onslo Court (?), London Architecture Residences Interior

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Interior of Aenny Catzenstein's apartment; Onslo Court (?), London Architecture Residences Interior

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Interior of Aenny Catzenstein nee Gottschalk's cottage during WW II; Ascona, Switzerland Architecture Residences Interiors

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Harbouring dissent: Greek independent and social media and the antifascist movement

This article examines Greek activists’ use of a range of communication technologies, including social media, blogs, citizen journalism sites, Web radio, and anonymous networks. Drawing on Anna Tsing’s theoretical model, the article examines key frictions around digital technologies that emerged within a case study of the antifascist movement in Athens, focusing on the period around the 2013 shutdown of Athens Indymedia. Drawing on interviews with activists and analysis of online communications, including issue networks and social media activity, we find that the antifascist movement itself is created and recreated through a process of productive friction, as different groups and individuals with varying ideologies and experiences work together.

"Klo-KU-BA", Hans and Elizabeth Krakauer's first marital apartment in the basement of the Jewish Hospital; Hannover, Germany Architecture; Residences; Interior

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Exterior view of expressionist painter Emil Luethy's home; Gotthardstr. 41 (Basel?) Architecture Residences Exterior

Handwritten on verso: zu obest mein Atelier (My studio on the top floor)

Simple technique for noise reduction in images retrieved from crystalline storage media

Now that crystals are being considered suitable for high density optical information storage, it is important to reduce the noise levels of retrieved images. The paper describes a simple technique to bring this about.

Biaxial-load effects on isopachics for a crack at the interface of dissimilar media

The plane problem of two dissimilar materials, bonded together and containing a crack along their common interface, which were subjected to a biaxial load at infinity, is examined by giving a closed-form expression for the first stress invariant of the normal stresses, which is equally valid everywhere, near to, and far from, the crack-tip region. This exact expression for the first-stress invariant is compared by constructing the respective isopachic-fringe patterns, to the approximate expression with non-singular terms, due to the biaxiality factor, for the same quantity. Significant differences between respective isopachic-patterns were found and their dependence on the elastic properties of both materials and the applied loads was demonstrated. The relative errors between the computedK I - andK II -components by using the approximate expression for the first stress-invariant and the accurate one, derived from closed-form solution along either isopachic-fringes or along circles and radii from the crack-tip have been given, indicating in some cases large discrepancies between exact and approximate solutions.

MPC controlled multirotor with suspended slung load: System architecture and visual load detection

There is an increased interest in the use of Unmanned Aerial Vehicles for load transportation from environmental remote sensing to construction and parcel delivery. One of the main challenges is accurate control of the load position and trajectory. This paper presents an assessment of real flight trials for the control of an autonomous multi-rotor with a suspended slung load using only visual feedback to determine the load position. This method uses an onboard camera to take advantage of a common visual marker detection algorithm to robustly detect the load location. The load position is calculated using an onboard processor, and transmitted over a wireless network to a ground station integrating MATLAB/SIMULINK and Robotic Operating System (ROS) and a Model Predictive Controller (MPC) to control both the load and the UAV. To evaluate the system performance, the position of the load determined by the visual detection system in real flight is compared with data received by a motion tracking system. The multi-rotor position tracking performance is also analyzed by conducting flight trials using perfect load position data and data obtained only from the visual system. Results show very accurate estimation of the load position (~5% Offset) using only the visual system and demonstrate that the need for an external motion tracking system is not needed for this task.