4,881 research outputs found
The political principles of Mencius / by Francis C.M. Wei
Full text linkhttp://www.archive.org/details/thepoliticalprin00weicuof
Correspondence to Mary Ann Smith From William H. Borders and C.M. Lowe, March 22, 1961
No full textCorrespondence from William H. Borders and C.M. Lowe to Mary Ann Smith notifying her of a meeting for the Atlanta Student Adult Liaison. 1 page
Titan's influence on Saturnian substorm occurrence
No full textSubstorms play an important role in the energization and transport of plasmas in planetary magnetospheres, including the shedding of the mass added by moons in the case of Jupiter and Saturn. Mass shedding occurs through rapid reconnection in the near tail resulting in dipolarization on the magnetospheric side of the reconnection point and plasmoid formation down tail. Observations of these sudden reconnection events in Saturn's near-tail region provide additional insight into this process. Saturnian substorms, at least on occasion, have a plasmoid formation phase leading to a traveling compression region. Changes in the field strength across reconnection events suggest that open flux has been removed fromthe tail. The timing of tail reconnection events appears to be controlled by both the orbital phase of Titan, and the variable stretching of the near-tail field as Saturn rotates.</p
Tunable photoluminescence and photoconductivity in ZnO one-dimensional nanostructures with a second below-gap beam
No full textOptical detection of magnetoelectric effect in the composite consisting of InGaN/GaN multiple quantum wells and FeCo thin film
No full textCognitive Coordination for Cooperative Multi-Robot Teamwork
No full textMulti-robot teams have potential advantages over a single robot. Robots in a team can serve different functionalities, so a team of robots can be more efficient, robust and reliable than a single robot. In this dissertation, we are in particular interested in human level intelligent multi-robot teams. Social deliberation should be taken into consideration in such a multi-robot system, which requires that the robots are capable of generating long term plans to achieve a global or team goal, rather than just dealing with the problems at hand. Robots in a team have to cope with dynamic environments due to the presence of the others. Thus, a robot cannot foresee what its environment will be because other robots may change the environment. Moreover, multiple robots may interfere with each other. We can say that the need for coordination in a robot team stems from interdependence relationships between the robots. More specifically, one robot performing an activity may influence another robot's activity. In order to achieve good team performance, the robots in a team all need to well coordinate their activities. This dissertation studies the multi-robot teamwork in the context of search and retrieval, which is known as foraging in robotics. In a foraging task, a team of robots is required to search targets of interest in the environment and also deliver them back to a home base. Many practical applications require search and retrieval such as urban search and rescue robots, deep-sea mining robots, and autonomous warehouse robots. Requiring both searching and delivering makes a foraging task more complicated than a pure searching, exploration or coverage task. Foraging robots have to consider not only where to explore but also when to explore. Coordination for a foraging task concerns how to direct the movements of the robots and how to distribute the workload more evenly in a team. In this dissertation, we first proposed an agent-based cognitive robot architecture that is used to bridge the gap between low-level robotic control with high-level cognitive reasoning. Cognitive agents realized by means of the agent programming language GOAL are used to control both real and simulated robots. We carried out an empirical study to investigate the role of communication and its impact on team performance. The results and findings were used to study the multi-robot pathfinding and multi-robot task allocation problems. A novel fully decentralized approach was proposed to deal with the multi-robot pathfinding problem, which also reduces the communication overhead, compared to usual decentralized approaches. An auction-based approach and a prediction approach were proposed to deal with the dynamic foraging task allocation problem. The difference is that the prediction approach performs better with respect to completion time, while the auction-based approach performs better with respect to travel costs. In order to facilitate the identification of interdependence relationships between the agents in the early design phase of a multi-agent system, we developed a formal domain-independent graphical language that reflects the need for coordination in multi-agent teamwork.Intelligent SystemsElectrical Engineering, Mathematics and Computer Scienc
Three-component velocity measurements in a momentum-conserving, axisymmetric, turbulent jet
No full textExperiments have been performed on a momentum conserving axisymmetric turbulent jet, the turbulence characteristics of which are well known [1]. Simultaneous three-component velocity measurements are acquired with high spatial and temporal resolution, using a new triple-sensor hotwire probe. Velocity and directional calibrations are performed using a dedicated automatic calibration system. Two experiments are performed; one for capturing the average velocity field in a 3D volume, and one for investigating the turbulence spectra in specific points in space. In the first experiment, measurements are performed in 9 equidistant cross-planes, from 10- to 50-diameters downstream of the nozzle using a computer-controlled traversing system. The spatial resolution is as low as 1 mm and the sampling rate was 10 kHz. In the second experiment, long velocity time histories are acquired with 50 kHz sampling rate to perform power spectral density computations for each velocity component. Preliminary results of velocity capture confirm the general characteristics of the turbulent jet. The power spectra at different positions indicate that the turbulent fluctuations are not isotropic at lower frequencies
A General History of the Congregation of the Mission Beginning after the Death of Blessed Vincent de Paul
Full text linkThis work is the earliest known history of the Congregation of the Mission and dates from about 1730. Vincentian historian John E. Rybolt, C.M., building on the initiative of Stafford Poole, C.M., completed this English translation from the original French. The author, Claude-Joseph Lacour, C.M. (1672-1731), drew from already published materials and his own recollections. While the story he tells may seem familiar, Lacour included materials that are unknown anywhere else and delivers a first-hand account of the Congregation’s rapid growth in those early days. The text is essential reading for anyone wishing to better understand Vincent de Paul’s society of apostolic life of priests and brothers following his death.https://via.library.depaul.edu/vincentian_ebooks/1044/thumbnail.jp
Turbulent separation in lower curved wall channels
No full textTurbulent boundary layer separation in channels with a lower curved wall is studied using direct numerical simulations (DNS). Turbulence dynamics are studied through classical statistical tools such as the turbulent kinetic energy budget for varying lower curved wall dimensions. The geometry features are expected to have a significant effect on the fluid flow structures and the characteristic scales of separation. The separation bubble behind the bump is studied in terms of its size, turbulent kinetic energy production mechanisms and transfer and scale-by-scale energy budget. New innovative data-analysis techniques will be used based on the generalisation of the Kolmogorov equation to anisotropic and spatially non-homogeneous flow configurations
Turbulence modulation in particle laden homogeneous shear flow: Exact Regularized Point Particle method
No full textThis contribution presents a first evaluation of a new approach, dubbed the Exact Regularized Point Particle (ERPP) method [Gualtieri et al., Exact regularized point particle method for multi-phase flows in the two-way coupling regime, arXiv preprint arXiv:1405.6969], designed to model the modulation of turbulence by hundred thousands of small inertial particles. The approach overcomes some intrinsic difficulties which arise in some circumstances in available approaches like, e.g., the Particle In Cell (PIC) method introduced by Crowe and coworkers since 1977. Numerical results concerning a homogeneous shear flow at moderate values of the Reynolds number laden with hundred thousand of small inertial particles are discussed documenting the turbulence modification in the so-called two-way coupling regime, in a range of control parameters unaccessible to the available approaches
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