7,652 research outputs found
Oral History Interview with Robert Lewis Kelly, June 5, 2005
No full textTranscript of an oral interview with Robert Lewis Kelly. Kelly joined the Naval Reserve in 1938 in Kansas City, Missouri. He was sent to Pearl Harbor, Hawaii on an ATA (auxiliary ocean tug.) He initially served on a troop transport ship. He later served on minelayers and minesweepers in the Atlantic Theater. He describes being transported in Africa in a 40-and-8 box car. He also provides information about his parents and siblings. He served until the end of the war. Kelly served on a troop transport ship in both the Pacific and Atlantic Theaters. He went to Mine Warfare School and then served on minesweepers and minelayers. He provided minesweeping support for the Normandy Invasion. In addition to sharing information about minelaying and minesweeping, he describes being on liberty in Greece; serving as a brig warden; experiencing a tsunami and a typhoon while at sea; witnessing a German submarine attack near Bermuda; experiencing a London air raid; witnessing the USS Osprey and the USS Tide hitting mines and the USS Texas being hit by German shells; and living on the beach in Casablanca. He recounts a story about missing alcohol in the marine compass. He also describes the food situation for people in Naples, Italy. He was serving in Norfolk, Virginia at the close of the war
The stability of rock on mild slopes under wave attack
No full textMomentarily the determination of the static stability of rock on mild slopes can be split in roughly two paths, the empirical and the physical approach. However, both the approaches have their limitations from which one could conclude that neither approach is currently an accurate description of the stability of rock on mild slopes under wave attack. The empirical approach by van der Meer [1988] has to be extrapolated outside its validity region and is deemed to be too conservative by Schiereck and Fontijn [1996]. The physical approaches on which the software XBeach-G[1], runs are capable of globally determining dynamic profile response reasonably well however they cannot accurately determine static stability. From this lack of an accurate approach to determine the stability of rock on mild slopes under wave attack, follows the research question of this thesis: “How should the stability or rock on mild slopes be described?” To determine how to describe the stability of rock on mild slope under wave attack, a test plan was set up. The test plan was split into two parts, firstly the empirical approach and secondly the physical approach. The empirical approach is based around the formula of Van der Meer [1988] for plunging waves. Whereas the physical approach follows the methodology of Xbeach-G. For which the input parameters have been derived by the means of a combination Bubble Image Velocimetry (BIV) and Particle Image Velocimetry (PIV)
Kelly The Pirate
No full textBritish sailors attack and capture a pirate ship.https://egrove.olemiss.edu/kgbsides_uk/2277/thumbnail.jp
A Novel Bilevel False Data Injection Attack Model Based on Pre-and Post-Dispatch
No full textThis letter develops a new bilevel optimization model to construct false data injection attack based on pre- and post- dispatch. In order to enhance the attack concealment, the proposed bilevel model can minimize the variation of uploaded measurements between pre- and post-attack before dispatching, after which the attack can lead the system to an uneconomic and insecure operating state after dispatching. Simulation results validate the effectiveness of the proposed bilevel model in term of operating cost and network overloads.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
The influence of the angle of attack on passenger comfort
No full textThe angle of attack (AOA) of an airplane changes the direction of the gravitational force on passengers and thereby might influence passengers’ flying experience. However, the contribution of the AOA regarding comfort/discomfort is not fully explored. In this paper, we aim to fill this knowledge gap by identifying the relationships between the perceived comfort/ discomfort of passengers and the AOA of the plane during the take-off and climbing phases of a flight. Anexperiment is conducted in a Boeing 737 fuselage where 10 participants were recruited. Each participant experiences 3 setups of seats with different AOAs (3, 14 and 18 degrees) for 20 minutes, respectively. Participants were asked to complete several sets of questionnaires during each session, and their heart rate and the pressure on the seat and the backrest were recorded as well. Experiment results indicated that participants experienced 14-degree as the most comfortable angle with the lowest discomfort, which might be useful for airlines in setting up the take-off and climbingprocedure.Mechatronic DesignMaterials and Manufacturin
Attack at Kelly\u27s Ford, VA
No full textThe black and white steel engraving features a scene from the Battle of Kelly\u27s Ford, which took place in 1863. In the image, soldiers wade through water while carrying guns and flags. Men can be seen in the distance firing their rifles. The engraving is printed on off-white paper.https://scholarsjunction.msstate.edu/fvw-prints/1089/thumbnail.jp
Plant responses to pathogen attack: molecular basis of qualitative resistance
No full textPathogens attack plants to assimilate nutrients from them. All plant species have succeeded in overcoming pathogenic attack; therefore disease condition is not the rule but the exception. A co-evolutionary battle has equipped plants with sophisticated defense mechanisms and cognate pathogens with a corresponding arsenal of counter strategies to overcome them. Traditionally, plant-pathogen interaction has been associated with molecules involved in recognition processes giving rise to models such as the "Zig-zag Model". However, this model is being re-evaluated because it is not consistent with the complexity of the interaction. Current models propose a holistic view of a process where the response is not always determined by the interaction of two molecules. This review discusses the main aspects related to qualitative responses in the plant-pathogen interaction and the new proposed models
Numerical investigation of external sulfate attack and its effect on chloride binding and diffusion in concrete
No full textReinforced concrete (RC) structures may suffer from serious durability problems during long-term service. To investigate the deterioration of RC structures subjected to the dual attacks of chlorides and sulfates, this study proposes a coupled model for external sulfate attack (ESA) and its effect on chloride binding and diffusion. To account for the influence of sulfate attack on chloride binding, a reduction function is proposed. The effect of sulfate-induced damage on the chloride diffusion and chloride binding is considered through a damage function. The coupled model is validated against third-party experimental data from multiple perspectives. Some important factors such as solution concentration, immersion time, curing time and water-cement ratio, as well as how these factors affect the impact of sulfate attack on chloride transport, were elaborated. The findings may bring insights to the durability design of RC structures serving in harsh environments.Accepted author manuscriptMaterials and Environmen
Attack Graph Model for Cyber-Physical Power Systems Using Hybrid Deep Learning
No full textElectrical power grids are vulnerable to cyber attacks, as seen in Ukraine in 2015 and 2016. However, existing attack detection methods are limited. Most of them are based on power system measurement anomalies that occur when an attack is successfully executed at the later stages of the cyber kill chain. In contrast, the attacks on the Ukrainian power grid show the importance of system-wide, early-stage attack detection through communication-based anomalies. Therefore, in this paper, we propose a novel method for online cyber attack situational awareness that enhances the power grid resilience. It supports power system operators in the identification and localization of active attack locations in Operational Technology (OT) networks in near real-time. The proposed method employs a hybrid deep learning model of Graph Convolutional Long Short-Term Memory (GC-LSTM) and a deep convolutional network for time series classification-based anomaly detection. It is implemented as a combination of software defined networking, anomaly detection in communication throughput, and a novel attack graph model. Results indicate that the proposed method can identify active attack locations, e.g., within substations, control center, and wide area network, with an accuracy above 96%. Hence, it outperforms existing state-of-the-art deep learning-based time series classification methods.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
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