WorldWideScience

Sample records for bollards

  1. Propeller Design Optimization for Tunnel Bow Thrusters in the Bollard Pull Condition

    Science.gov (United States)

    2012-06-01

    brushless motor which drives a shaft with an integrated dual strain gauge torque and thrust sensor. The motor , a Parker kit motor (model K089300-7Y2...21 Motor and Motor Controller...19 Figure 6: Motor Assembly

  2. The Guardian. Volume 11, Issue 2, Fall 2009

    Science.gov (United States)

    2009-01-01

    or a retractable bollard, retract into the ground, allowing vehicles to pass into the protected area. Passive barriers, like fixed bollards, cable...standard also specifies the truck’s wheel base, requires specific installation procedures for fixing the flatbed to the trucks chassis , and requires a

  3. 49-FT Boat Utility Stern Loading (BUSL) (49403 Underway Testing)

    National Research Council Canada - National Science Library

    Macesker, Bert

    1997-01-01

    .... The trials consisted of speed/power, tactical measurements. spiral maneuver, zig zag maneuvers, bollard pull, noise and vibration survey, endurance test, emergency stop, scale weighing, and an initial corrosion survey...

  4. A maritime archaeological exploration along the Narmada estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Gaur, A.S.; Sundaresh

    is known as Furza Bandar (Figure 2) and is situated towards west of the fort area on the northern bank of the river Narmada. It is also known as Juna (old) Bharuch. The remains of jetty and bollard are visible and presently the surface of jetty and level... demand in Saurashtra and Kachchh through the entire protohistoric and historical periods. As it is evident from the earlier explorations and excavations that during the early historic period Bharuch was very busy port and served...

  5. Volatility

    Directory of Open Access Journals (Sweden)

    María Sánchez

    2016-11-01

    Full Text Available The action consists of moving with small kicks a tin of cola refresh -without Brand-from a point of the city up to other one. During the path I avoid bollards, the slope differences between sidewalks, pedestrians, parked motorcycles, etc. Volatility wants to say exactly that the money is getting lost. That the money is losing by gentlemen and by ladies who are neither financial sharks, nor big businessmen… or similarly, but ingenuous people, as you or as me, who walk down the street.

  6. Verification of CFD analysis methods for predicting the drag force and thrust power of an underwater disk robot

    Directory of Open Access Journals (Sweden)

    Joung Tae-Hwan

    2014-06-01

    Full Text Available This paper examines the suitability of using the Computational Fluid Dynamics (CFD tools, ANSYSCFX, as an initial analysis tool for predicting the drag and propulsion performance (thrust and torque of a concept underwater vehicle design. In order to select an appropriate thruster that will achieve the required speed of the Underwater Disk Robot (UDR, the ANSYS-CFX tools were used to predict the drag force of the UDR. Vertical Planar Motion Mechanism (VPMM test simulations (i.e. pure heaving and pure pitching motion by CFD motion analysis were carried out with the CFD software. The CFD results reveal the distribution of hydrodynamic values (velocity, pressure, etc. of the UDR for these motion studies. Finally, CFD bollard pull test simulations were performed and compared with the experimental bollard pull test results conducted in a model basin. The experimental results confirm the suitability of using the ANSYS-CFX tools for predicting the behavior of concept vehicles early on in their design process.

  7. Verification of CFD analysis methods for predicting the drag force and thrust power of an underwater disk robot

    Directory of Open Access Journals (Sweden)

    Tae-Hwan Joung

    2014-06-01

    Full Text Available This paper examines the suitability of using the Computational Fluid Dynamics (CFD tools, ANSYS-CFX, as an initial analysis tool for predicting the drag and propulsion performance (thrust and torque of a concept underwater vehicle design. In order to select an appropriate thruster that will achieve the required speed of the Underwater Disk Robot (UDR, the ANSYS-CFX tools were used to predict the drag force of the UDR. Vertical Planar Motion Mechanism (VPMM test simulations (i.e. pure heaving and pure pitching motion by CFD motion analysis were carried out with the CFD software. The CFD results reveal the distribution of hydrodynamic values (velocity, pressure, etc. of the UDR for these motion studies. Finally, CFD bollard pull test simulations were performed and compared with the experimental bollard pull test results conducted in a model basin. The experimental results confirm the suitability of using the ANSYS-CFX tools for predicting the behavior of concept vehicles early on in their design process.

  8. The materialization of fear

    DEFF Research Database (Denmark)

    Jensen, Martin Trandberg

    Perhaps more than ever before Western societies are shaped by powerful imaginaries of terror, security treats and the politics of fear. Copenhagen, while often perceived as a liberal and ‘walkable city’, is no exception. With little public involvement or democratic participation, recent political...... to matter in ways not simply reducible to security optimization, risk management and symbolic politics? To reach this aim, I draw on material studies, mobilities design and non-representational theories to provide a rich socio-material tale of how granite stones, bollards and other counter......-terrorist materials contribute to the construction and ‘feel’ of contemporary urban tourism. How do such prominent material designs influence, both affectively, practically and emotionally, tourists? How are they re-appropriated and imbued with (inter)subjective meanings, and how may a richer understanding of how...

  9. Estelas funerarias islámicas de Ávila : clasificación e inscripciones

    Directory of Open Access Journals (Sweden)

    Javier Jiménez Gadea

    2009-01-01

    Full Text Available La excavación, entre los años 1999 y 2003, de la necrópolis islámica de Ávila, generó la entrega en el Museo de Ávila de un conjunto de estelas funerarias que, añadidas a las ya existentes en el museo, forman –en el contexto de la arqueología medieval española– un conjunto único de estelas funerarias mudéjares. En este trabajo se proporciona un sistema de clasificación para las mismas que ayuda a su estudio y que puede hacerse extensible al de las muchas que aún se encuentran reutilizadas por la ciudad de Ávila, como sillares en muchos de sus antiguos edificios y muros y como simples bolardos urbanos, así como para piezas similares que puedan aparecer en otros contextos, con el objetivo de simplificar la terminología y evitar confusiones interpretativas debidas al mal uso de ciertos arabismos. Aunque la mayoría son anepígrafas, se conservan, sin embargo, algunas con inscripciones en árabe, de las que aquí se ofrece también su traducción. El análisis formal, estilístico y epigráfico de las piezas y el contexto estratigráfico de aquellas aparecidas en excavación arqueológica sitúan cronológicamente el conjunto entre los siglos XIII y XV, confirmando, pues, el carácter mudéjar de la almacabra abulense.The excavation of the Islamic necropolis of Ávila (between 1999-2003 generated the delivery in the Museum of Ávila of an assembly of funeral gravestones, that added to the preexistents in the Museum, they form –in the context of the Spanish Medieval Archeology– an unique assembly of mudéjar funeral gravestones. In this work a systemof classification for the mis provided, that helps to its study and can be done extendible for that of the many of them that still are reused in the city of Ávila, like ashlars in many of their old buildings and walls and also as simple urban bollards, as well as for similar pieces that can appear in other contexts, with the objective to simplify the terminology and avoid