506 research outputs found
Presidents, parties and the constitution of the people: reconsidering the origins and development of the rhetorical executive
No full textThis dissertation research focuses on broad questions of democratic practice and institutional design by way of examining the origins and development of presidential rhetoric. I challenge some of the reigning assumptions about the rise of popular executive leadership in America by showing Twentieth Century practice not to be completely innovative, but to stem from the interest of the modern executive in a rhetorical defense of its interests, as anticipates in the executive theory of Machiavelli and Hobbes. I also make the argument for Twentieth Century continuity with earlier presidential behavior toward public opinion by a natural tension between constitutionalism and theories of partisanship that stretches from Bolingbroke to Jefferson, and beyond.Ph.D.Includes bibliographical references (p. 212-219)by Lee Christopher Wes
Replication data for: Working Twice as Hard to Get Half as Far: Race, Work Ethic, and America’s Deserving Poor
No full textWorking Twice as Hard to Get Half as Far: Race, Work Ethic, and America’s Deserving Poor This work was completed while the author was a graduate student in the Department of Political Science at Duke University. This research would not have been completed without support and guidance from many people, most notably Melissa Spas, John Aldrich, Marc Hetherington, Suzanne Globetti, Candis Watts Smith, Stanley Feldman, Kerry Haynie, D. Sunshine Hillygus, Melanie Freeze, Jacob Montgomery, Brendan Nyhan, David Sparks, Cassy Dorff, Corrine M. McConnaughy, Julie Edell Britton, Cara Wong, and three anonymous reviewers. Data collection would not have been possible without support from the Social Science Research Institute and Duke University. All remaining errors are, of course, my own. Replication data will be made available through the AJPS portal on Dataverse
Flexible Magnetic Reading/Writing System: Heat-assisted Magnetic Recording
No full textAbstractData storage is one of indispensable technical assets defined in a frame work of Industry 4.0. Among many data storage technologies, inherent magnetic data storage on surfaces of technical components is promising, especially when the components are employed in harsh environments. Comparing with other storage technologies like labels, RFID tags and engraving, the inherent magnetic storage is rewritable and resistant to weathering. High temperature and a high magnetic field, however, can degrade or even delete magnetically stored data. This limitation can be coped with using a medium with higher coercivity that can withstand external magnetic fields and high temperature. As a consequence of higher coercivity, a higher write field is required to magnetize the medium. A design of a flexible write head that is suitable for storage applications on surfaces of technical components, is restricted by head-medium interface criterions, and hence field strength generated from the write head cannot be arbitrary large. To solve this problem, a heat-assisted magnetic recording (HAMR) is proposed as a means to temporarily reduce coercivity of a medium during writing. A realization of a HAMR module and an experiment as well as its positive results are presented in this work
Development of a Humidity Sensor Element Based on Sputter-deposited thin ZnO-Layers
No full textAbstractA sensor concept for humidity measurement has been invented at the Institute of Micro Production Technology. The sensor element is manufactured on silicon oxide wafers with respect to the requirements of a new direct deposition process. This new process allows for thinner sensors with higher measuring accuracy. High purity 4N zinc oxide is used for the humidity sensing layer. Sensor properties and characteristics have been evaluated using X-ray diffraction and scanning electron microscopy. Finally, the evaluation electronic concept based on an embedded system with a field programmable gate array (FPGA) is presented
Passive and Active Thermal Management of Bonded Bare-Dice Laser Diodes on Polymer Foil Substrates
No full textFlexibel und druckempfindlich : Sensoren für die Insertionsüberwachung in der Cochlea
No full textDas Einsetzen eines Cochlea-Implantats in die Hörschnecke ist eine komplizierte Operation, die nicht immer ohne Schädigung des empfindlichen Gewebes einhergeht. Forschungsarbeiten am Institut für Mikroproduktionstechnik (IMPT) konzentrieren sich deswegen auf die Entwicklung einer Sensorik im Implantat, die dem Chirurgen während des Eingriffs helfen soll, Verletzungen zu vermeiden
Sensor Inserts on Spherical Surfaces for Temperature Measurement in Wear Contacts
No full textWear and the resulting temperature has a significant influence on the frictional contact behavior of two surfaces in contact. In order to establish accurate wear prediction models, it is essential to measure the temperature at the point of action. This work shows the approach for manufacturing a component-inherent temperature sensor on a ceramic sphere via laser structuring in order to measure friction-induced temperature changes precisely at the point of action during tribologically relevant ball-on-disc tests. Within this paper, different sensor layouts are tested and the sensor fabrication and high temperature contacting via laser direct structuring on ceramics is revealed in detail. A TCR of 2440pm 123 ppm /°C could be achieved after an annealing process for the layout with the smallest line width. Measurements of the wear resistance of the Al2O3 layer showed, that the sensors life span enables a sliding distance of at least 1,000 mm. During the tribological testing, friction induced temperature changes as well as short-term temperature peaks were measured.
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Dicing by “Crack-and-Fracture” – Novel separation method for MEMS substrates
No full textThe dicing of microsystems is an essential part of the batch production of MEMS. For this purpose, various methods have been
developed, improved and integrated into a highly productive process. The future challenges of the batch manufacturing in this part
are the 3-D integration of individual chips, the increasing diameter of the substrates and the associated wafer thickness. The
establishment of 12" and 18" substrates into MEMS production bring new challenges to all currently used separation
manufacturing processes. In this work the established separation process of dicing is evolved. Here, a "Crack-and-Fracture" method
for silicon and borosilicate glass (Pyrex®) is examined.
The work shows a novel process for backside chipping-free separation of silicon and glass substrates for MEMS. A theoretical
coupling between "Crack-and-Fracture" and the stress intensity factor/crack propagation via the “Paris-Erdogan” law is
determined. The area of linear expansion cracks is the active process mode of this method. In order to avoid the areas of subcritical
crack growth (no separation) and overcritical crack growth (backside chipping), a high process understanding/control is needed
J.C. Bach's London keyboard sonatas : style and context
No full textJ. C. Bach's keyboard works include several sets of accompanied sonatas, a genre that enjoyed a wide popularity during the Classical era, but never
found its way into the concert repertoire. The accompanied sonata was a genre meant for domestic performance; the solo keyboard sonata, on
the other hand, was adopted in due course by concert audiences. J. C. Bach composed works within both genres during most of his productive years, and his output constitutes a corpus of remarkable consistency. J. C. Bach's removal to London in 1762 coincided with his clear adoption of a galant style, marked by the Italianate influence, and the abandonment of most Baroque traits. The British milieu provided additional factors: the rise of the pianoforte, a thriving music-publishing market, and a great interest in domestic music making among the affluent classes. These factors marked J. C. Bach's output at various levels. Keyboard works had to conform to the proficiency of the amateur performer, a
fact reflected in the accompanied output mostly. The number of movements, their length, and the inclusion of particular technical devices are readily observable differences between the two genres. The most remarkable
distinction lies perhaps in the preference for binary sonata format in the accompanied. sonatas from the mid 1760s to the 1770s, in spite of a later tendency for tripartite designs in both genres. J. C. Bach's lifelong preference for motivic phrase structure conditioned his keyboard production and partly explains the gap in quality between some of his works and sonatas composed around the same time by Haydn and Mozart, who developed more effective means to connect the melodic material
to higher structural units. J. C. Bach's influence, however, endured in Mozart's handling of melody, and his keyboard production constitutes, in spite of some flaws, a noteworthy example of elegance and craftsmanship
Book Reviews
No full text'Searching for a Better Society: The Peruvian Economy from 1950'; Author: by John Sheahan; Reviewer:Raul Hopkins; 'Democratisation in Africa'; Editors: Larry Diamond and Marc F. Plattner; Reviewer: Jan Kees van Donge; 'Exchange Rate Misalignment: Concepts and Measurement for Developing Countries'; Editors: Lawrence E. Hinkle and Peter J. Montiel; Reviewer: Christopher Tsoukis; 'Orangi Pilot Project, Reminiscences and Reflections'; Author: Akhtar Hameed Khan; Reviewer: Jo Beall; 'Whey Governments Waste Natural Resources: Policy Failures in Developing Countries'; Author: William Ascher; Reviewer: Julio Pena-Torres; 'Evaluating Development Aid - Issues, Problems and Solutions'; Author: Basil Cracknell; Reviewer: Mike Faber; 'Development Microeconomics'; Authors: Pranab Bardhan and Christopher Udry; Reviewer: Scott McDonald; 'Economic and Social Changes in Czech Society After 1989: An Alternative View'; Authors: Lubomir Mlcoch, Pavel Machonin and Milan Sojka; Reviewer: Alasdair MacBean; 'Resistance to the Shah: Landowners and Ulama in Iran'; Author: Mohammad Gholi Majd; Reviewer: Rodney Wilson; 'Corruption and Democratisation'; Editors: Alan Doig and Robin Theobald; Reviewer: Heather A. Marquette;Review Books,
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