2,350 research outputs found
T.J. Stiles: “The Commodore’s Patriotism: Cornelius Vanderbilt’s Path to the Founding of Vanderbilt University”
No full textIncludes descriptive metadata provided by producer in MP4 file: "Chancellor's Lecture Series - Videos - T.J. Stiles: 'The Commodore’s Patriotism: Cornelius Vanderbilt’s Path to the Founding of Vanderbilt University'." By Vanderbilt University. T.J. Stiles, Pulitzer Prize-winning author and historian, speaks Sept. 29, 2010 as part of the Chancellor's Lecture Series. Stiles wrote the 2009 biography The First Tycoon: The Epic Life of Cornelius Vanderbilt. Chancellor Nicholas Zeppos introduces Stiles. Stiles takes questions after his lecture
Cwbr Author Interview: Custer\u27s Trials: A Life On The Frontier Of A New America
No full textInterview with T.J. Stiles, author of Custer\u27s Trials: A Life on the Frontier of a New America Interviewed by Tom Barber
Civil War Book Review (CWBR): The Civil War Book Review is pleased to speak with T.J. Stiles, winner of multiple awards for biography and author of Jesse James: Last Rebel of the Civil War and The First Tycoon: The Epic Life of Cornelius Vanderbilt. Today we get to discuss his most recent work Custer\u27s Trials: A Life on the Frontier of a New America. Mr. Stiles, thank you for joining us today. T.J. Stiles: Thanks very much for interviewing me...
Scuffing detection of TU3 cam–follower contacts by electrostatic charge condition monitoring
No full textThe increasing costs associated with lubricant development and qualification has driven the need for condition monitoring techniques to be deployed on test engines to maximise information gained from expensive testing programmes. This paper discusses the results from a motorised TU3 engine with electrostatic sensors focused on the cams. System characterisation tests and an oil starvation test were used to decouple charge mechanisms associated with a lubricated wear test, accelerated through the use of carbon black. Cross-correlation of various charge signal processing techniques, scanning electron microscopy and profilometry revealed that tribocharging dominated during running-in/mild wear and contact potential difference (CPD) dominated during the progression of severe adhesive wear. Tribocharging (the charge generated by a low conductivity fluid) has been shown to be affected by oil temperature, cam rotation speed and the presence of charged species within the lubricant. Contact potential differences was principally generated by the work function difference between oxidised and nascent regions associated with adhesive wear on the cam surface. Electrostatic monitoring which is sensitive to lubricant chemistry and wear, and can be implemented in an industry standard engine, has great potential for the lubricant industr
Flow patterns around longitudinal training dams
No full textWith the intention to reduce the negative effects of ongoing bed erosion, as well as to improve several other river functions such as protection against floods, provision of safe and efficient navigation and ecology, a ‘pilot project longitudinal training dams’ was initiated. The training dams have recently been implemented in the Waal between Tiel and Sind Andries. In this project, river groynes have been completely removed and replaced by dams that lie parallel to the river bank. With help of the longitudinal training dams, a two-channel river system is created in which the river is divided into a main and side channel. The dams are placed in a continuous manner with openings in between that are relatively small compared to the dam length. At the beginning and end of the dam an inlet and outlet region is situated, as shown in Fig. 1. The combination of inlet and openings allows for water and sediment to be divided between the main and the side channel. Both inlet and openings are constructed with the help of a porous rock-layer. The crest heights can be altered by adding or removing stones. This is expected to influence the amount of water and sediment entering the side channel and can therefore be used as a regulation tool. A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.) NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.Rivers, Ports, Waterways and Dredging EngineeringHydraulic Structures and Flood RiskEnvironmental Fluid Mechanic
Seismic interferometry as a tool for improved imaging of the heterogeneities in the body of a landfill
No full textAccepted Author ManuscriptGeo-engineeringApplied Geophysics and Petrophysic
On the dynamics of hydraulic lines supplying servosystems
No full textMechanical, Maritime and Materials Engineerin
Das hydrostatische Keilspaltlager: Berechnung und Anwendung bei Hydrozylindern
No full textMechanical, Maritime and Materials Engineerin
Azomethine-based Donor Materials for Organic Solar Cells
No full textSolution processable organic photovoltaics (OPVs) are attracting much attention because of their anticipated advantages such as low cost, flexibility, lightweight, and the potential to be produced on a large scale. The photoactive layer of OPVs consists of a blend of an electron donating and an electron accepting material. Over the last 20 years, a plethora of (record breaking) electron?donating materials have been reported, which are mostly synthesized via transition metal mediated aryl?aryl coupling reactions. These chemistries, however, make use of expensive metal catalysts, inert reaction conditions and require time?consuming product purification steps. In order to offer a more economic route towards OPVs we have explored novel conjugated azomethine?based (–N=CH–) donor materials and the initial results are presented in this thesis. The azomethine bond is isoelectronic to the vinyl bond (–CH=CH–) and displays similar optoelectronic and thermal properties. In addition, azomethines offer significant advantages over vinylenes as they can be prepared using Schiff base condensation chemistry under near ambient reaction conditions. Expensive catalysts are not required and water is the only by?product. The main objective of this research is to explore the use of azomethine?based donor materials in bulk heterojunction solar cells. The design and synthesis of azomethine?based polymers, (hyper?branched) oligomers, small?molecules (both linear and star?shaped) and their performance in photovoltaic devices will be presented in this thesis.Aerospace Structures and MaterialsAerospace Engineerin
Violent environment of the inner disk of RW Aurigae A probed by the 2010 and 2015 dimming events
No full textAims. The young binary system RW Aur shows strong signatures of a recent tidal encounter between the circumprimary disk and the secondary star. The primary star has recently undergone two major dimming events (Δmag ≈ 2 in V band) whose origin is still under debate. To shed light on the mechanism leading to the dimming events, we study the extinction properties, accretion variability, and gas kinematics using absorption lines from the material that is obscuring RW Aur A. Methods. We compared our moderate-resolution X-shooter spectra of the dim state of RW Aur A with other spectral observations. In particular, we analysed archival high-resolution UVES spectra obtained during the bright state of the system to track the evolution of the spectral properties across the second dimming event. Since the X-shooter spectrum is flux calibrated, we provide new synthetic photometry of RW Aur A during the dim state. Results. The spectrum obtained during the dim state shows narrow absorption lines in the Na and K optical doublets, where the former is saturated. With a velocity of - 60 km s-1, these lines indicate that during the dim state the disk wind is either enhanced or significantly displaced into the line of sight. The photometric evolution across the dimming event shows a grey extinction, and is correlated with a significant reduction of the EW of all photospheric lines. Emission lines that trace accretion do not vary significantly across the dimming. Conclusions. From comparing our observations with complementary results from the last years, we conclude that the dimming event is related to a major perturbation on the inner disk. We suggest that the inner disk is occulting (most of) the star and thus its photosphere, but does not occult the accretion regions within a few stellar radii. Since observations of the outer disk indicate that the disk is modestly inclined (45-60°), we propose that the inner disk might be warped by an as yet unseen (sub-) stellar companion, which may also explain the 2.77 day periodic variability of the spectral lines
Do X-ray binary spectral state transition luminosities vary?
No full textWe tabulate the luminosities of the soft-to-hard state transitions of all X-ray binaries for which there exist good X-ray flux measurements at the time of the transition, good distance estimates, and good mass estimates for the compact star. We show that the state transition luminosities are at about 1-4% of the Eddington rate, markedly smaller than those typically quoted in the literature, with a mean value of 2%. Only the black hole candidate GRO J 1655-40 and the neutron star systems Aql X-1 and 4U 1728-34 have measured state transition luminosities inconsistent with this value at the 1sigma level. GRO J 1655-40, in particular, shows a state transition luminosity below the mean value for the other sources at the 4sigma level. This result, combined with the known inner disk inclination angle (the disk is nearly parallel to the line of sight) from GRO J 1655-40's relativistic jets suggest that the hard X-ray emitting region in GRO J 1655-40 can have a velocity of no more than about beta =0.68, with a most likely value of about beta =0.52, and a minimum speed of beta =0.45, assuming that the variations in state transition luminosities are solely due to relativistic beaming effects. The variance in the state transition luminosities suggests an emission region with a velocity of ~ 0.2c. The results are discussed in terms of different emission models for the low/hard state. We also discuss the implications for measuring the dimensionless viscosity parameter alpha . We also find that if its state transitions occur at typical luminosities, then GX 339-4 is likely to be at a distance of at least 7.6 kpc, much further than typically quoted estimates
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