Relevant bibliographies by topics / VTUAV

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Conference papers

Academic literature on the topic 'VTUAV'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "VTUAV"

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Chan, H. G., M. D. King, and M. M. Frey. "The impact of parameterising light penetration into snow on the photochemical production of NO<sub>x</sub> and OH radicals in snow." Atmospheric Chemistry and Physics Discussions 15, no. 6 (March 23, 2015): 8609–46. http://dx.doi.org/10.5194/acpd-15-8609-2015.

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Abstract. Snow photochemical processes drive production of chemical trace gases, including nitrogen oxides (NO and NO2), and HOx radicals in snowpacks which are then released to the lower atmosphere. Coupled atmosphere–snow modelling on global scales requires simple parameterisations of actinic flux in snow to reduce computational cost. The disagreement between a physical radiative transfer method and a method based upon the e-folding depth of light-in snow is evaluated. In particular for the photolysis of the nitrate anion (NO3-), the nitrite anion (NO2-) and hydrogen peroxide (H2O2) within snow and photolysis of gas-phase nitrogen dioxide (NO2) within the snowpack interstitial air are considered. The emission flux from the snowpack is estimated as the depth-integrated photolysis rate, v, calculated (a) explicitly with a physical radiative transfer model (TUV), vTUV and (b) with a simple parameterisation based on e-folding depth, vze. The evaluation is based upon the deviation of the ratio of depth-integrated photolysis rate determined by the two methods,vTUV/vze, from unity. The disagreement in depth-integrated photolysis rate between the RT model and e-folding depth parameterisation depends primarily on the photolysis action spectrum of chemical species, solar zenith angle and optical properties of the snowpack, (scattering cross-section and a weak dependence on light absorbing impurity (black carbon) and density). For photolysis of NO2, the NO2- anion, the NO3- anion and H2O2 the ratio vTUV/vze varies within the range of 0.82–1.35, 0.88–1.28 and 0.92–1.27 respectively. The e-folding depth parameterisation underestimates for small solar zenith angles and overestimates at solar zenith angles around 60°. A simple algorithm has been developed to improve the parameterisation which reduced the ratio vTUV/vze to 0.97–1.02, 0.99–1.02 and 0.99–1.03 for photolysis of NO2, the NO2- anion, the NO3- anion and H2O2 respectively. The e-folding depth parameterisation may give acceptable results for the photolysis of the NO3- anion and H2O2 in cold polar snow with large solar zenith angles, but can be improved by a correction based on solar zenith angle.
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Chan, H. G., M. D. King, and M. M. Frey. "The impact of parameterising light penetration into snow on the photochemical production of NO<sub><i>x</i></sub> and OH radicals in snow." Atmospheric Chemistry and Physics 15, no. 14 (July 17, 2015): 7913–27. http://dx.doi.org/10.5194/acp-15-7913-2015.

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Abstract. Snow photochemical processes drive production of chemical trace gases in snowpacks, including nitrogen oxides (NOx = NO + NO2) and hydrogen oxide radical (HOx = OH + HO2), which are then released to the lower atmosphere. Coupled atmosphere–snow modelling of theses processes on global scales requires simple parameterisations of actinic flux in snow to reduce computational cost. The disagreement between a physical radiative-transfer (RT) method and a parameterisation based upon the e-folding depth of actinic flux in snow is evaluated. In particular, the photolysis of the nitrate anion (NO3-), the nitrite anion (NO2-) and hydrogen peroxide (H2O2) in snow and nitrogen dioxide (NO2) in the snowpack interstitial air are considered. The emission flux from the snowpack is estimated as the product of the depth-integrated photolysis rate coefficient, v, and the concentration of photolysis precursors in the snow. The depth-integrated photolysis rate coefficient is calculated (a) explicitly with an RT model (TUV), vTUV, and (b) with a simple parameterisation based on e-folding depth, vze. The metric for the evaluation is based upon the deviation of the ratio of the depth-integrated photolysis rate coefficient determined by the two methods, vTUV/vze, from unity. The ratio depends primarily on the position of the peak in the photolysis action spectrum of chemical species, solar zenith angle and physical properties of the snowpack, i.e. strong dependence on the light-scattering cross section and the mass ratio of light-absorbing impurity (i.e. black carbon and HULIS) with a weak dependence on density. For the photolysis of NO2, the NO2- anion, the NO3- anion and H2O2 the ratio vTUV/vze varies within the range of 0.82–1.35, 0.88–1.28, 0.93–1.27 and 0.91–1.28 respectively. The e-folding depth parameterisation underestimates for small solar zenith angles and overestimates at solar zenith angles around 60° compared to the RT method. A simple algorithm has been developed to improve the parameterisation which reduces the ratio vTUV/vze to 0.97–1.02, 0.99–1.02, 0.99–1.03 and 0.98–1.06 for photolysis of NO2, the NO2- anion, the NO3- anion and H2O2 respectively. The e-folding depth parameterisation may give acceptable results for the photolysis of the NO3- anion and H2O2 in cold polar snow with large solar zenith angles, but it can be improved by a correction based on solar zenith angle and for cloudy skies.
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Dissertations / Theses on the topic "VTUAV"

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Cason, Roman K. "Analysis of the Vertical Takeoff and landing Unmanned Aerial Vehicle (VTUAV) in small unti urban operations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sept%5FCason.pdf.

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2

Stracker, Matthew C. "An operational manpower analysis of the RQ-8 Fire Scout Vertical Take-Off Unmanned Aerial Vehicle (VTUAV)." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FStracker.pdf.

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Thesis (M.S. in Management)--Naval Postgraduate School, September 2007.
Thesis Advisor(s): Hatch, Bill. "September 2007." Description based on title screen as viewed on October 26, 2007. Includes bibliographical references (p. 77-81). Also available in print.
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Heiss, Kevin L. "A Cost Benefit Analysis of Fire Scout Vertical Takeoff and Landing Tactical Unmanned Aerial Vehicle (VTUAV) Operator Alternatives." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/6806.

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A cultural debate exists to determine if the MQ-8B Fire Scout Vertical Takeoff and Landing Tactical Unmanned Aerial Vehicle (VTUAV) should be operated by rated pilots, commissioned officers, or enlisted personnel. Each military service has historically treated this issue differently. The U.S. Navy currently requires rated pilots to fly Fire Scout, the U.S. Army and Marine Corps allow enlisted personnel to fly their Shadow Unmanned Aerial Vehicle (UAV), and the Air Force only allows rated pilots to fly their UAV systems. Technology has advanced rapidly in the area of UAVs as they have advanced from being remotely piloted aircraft to now being completely autonomous. This research examined the Air Vehicle Operator (AVO) requirements for autonomous vehicles such as Fire Scout and will demonstrate that the U.S Navy should create a pilot program that trains enlisted personnel to operate Fire Scout. This research identifies the costs and benefits associated with each type of prospective operator alternativerated pilots, commissioned Surface Warfare Officers (SWO), and Operations Specialist (OS) enlisted personnel. By utilizing enlisted AVOs vice rated pilots, training costs will be found to be reduced from millions to tens of thousands, annual amortized manning costs will be cut by more than half, and total cost savings will be found to be on the order of a billion dollars over a ten-year period. The research will also identify both tangible and intangible benefits by allowing enlisted personnel to become Fire Scout AVOs. Benefits are identified relating to training time, manning constraints, physiological constraints, culture, and safety. Furthermore, this research will summarize current Knowledge, Skills, and Abilities (KSA) necessary to operate an autonomous air vehicle such as Fire Scout.
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Rathore, Ankush, and ankushrathore@yahoo com. "A systems approach to model the conceptual design process of vertical take-off unmanned aerial vehicle." RMIT University. School of Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061114.103443.

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The development and induction in-service of Unmanned Air Vehicles (UAV) systems in a variety of civil, paramilitary and military roles have proven valuable on high-risk missions. These UAVs based on fixed wing configuration concept have demonstrated their operational effectiveness in recent operations. New UAVs based on rotary wing configuration concept have received major attention worldwide, with major resources committed for its research and development. In this thesis, the design process of a rotary-wing aircraft was re-visualised from an unmanned perspective to address the requirements of rotary-wing UAVs - Vertical Take-off UAVs (VTUAV). It investigates the conventional helicopter design methodology for application in UAV design. It further develops a modified design process for VTUAV addressing the requirements of unmanned missions by providing remote command-and-control capabilities. The modified design methodology is automated to address the complex design evaluations and optimisation process. An illustration of the automated design process developed for VTUAVs is provided through a series of inputs of the requirements and specifications, resulting in an output of a proposed VTUAV design configuration for
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Raymer, Michael K. "A comparative analysis of the Army MQ-8B Fire Scout Vertical Takeoff Unmanned Aerial Vehicle (VTUAV) AND Navy MQ-8B manpower & training requirements." Monterey, California: Naval Postgraduate School, 2009. http://hdl.handle.net/10945/10460.

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Approved for public release, distribution unlimited
The recent increased urgency to combat terrorism and asymmetric threats, combined with the environment in which field troops are forced to operate has created a unique demand for non-standard war fighting capabilities. Beginning in 2004, the U.S. Navy, in a joint effort with the U.S. Army, began jointly testing and evaluating the Northrop Grumman MQ-8B Fire Scout Vertical Take Off Unmanned Aerial Vehicle (VTUAV). This platform has shown very promising early results in testing and is slated for implementation on the Navy's newest Littoral Combat Ship (LCS). A manpower analysis of the Fire Scout MQ-8B was conducted to identify requirements applicable to operating the platform aboard LCS. Current Army MQ-8B manning was described and used to compute a baseline model determining best mix of manpower requirements needed to implement Fire Scout at sea. Accurate identification of manpower requirements and training for Fire Scout operators, technicians and support personnel will eventually diminish reliance on civilian contractors, and provide the opportunity for joint military operability. The Army MQ-8B Fire Scout training program was analyzed to compare the suitability and feasibility of Navy training for operators and technicians. Currently, there is no Navy training program in place to train Fire Scout operators and technicians to support LCS.
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Duhan, Daniel P. "Tactical decision aid for unmanned vehicles in maritime missions." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2274.

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Approved for public release; distribution is unlimited
An increasing number of unmanned vehicles (UV) are being incorporated into maritime operations as organic elements of Expeditionary and Carrier Strike Groups for development of the recognized maritime picture. This thesis develops an analytically-based planning aid for allocating UVs to missions. Inputs include the inventory of UVs, sensors, their performance parameters, and operational scenarios. Operations are broken into mission critical functions: detection, identification, and collection. The model output assigns aggregated packages of UVs and sensors to one of the three functions within named areas of interest. A spreadsheet model uses conservative time-speed-distance calculations, and simplified mathematical models from search theory and queuing theory, to calculate measures of performance for possible assignments of UVs to missions. The spreadsheet model generates a matrix as input to a linear integer program assignment model which finds the best assignment of UVs to missions based on the user inputs and simplified models. The results provide the mission planner with quantitatively-based recommendations for unmanned vehicle mission tasking in challenging scenarios.
Lieutenant, United States Navy
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Berner, Robert Andrew. "The effective use of multiple unmanned aerial vehicles in surface search and control." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FBerner.pdf.

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8

tsai, chih-chieh, and 蔡志杰. "VTUAV Flight Control System Design Using PID Controller." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/90025499320958195988.

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Books on the topic "VTUAV"

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Analysis of the Vertical Takeoff and Landing Unmanned Aerial Vehicle (VTUAV) in Small Unit Urban Operations. Storming Media, 2004.

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Conference papers on the topic "VTUAV"

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Huang, Ching-Huei, Chia-Sung Lee, and Chun-Liang Lin. "Flight path planning simulation for VTUAV." In 2014 11th IEEE International Conference on Control & Automation (ICCA). IEEE, 2014. http://dx.doi.org/10.1109/icca.2014.6870892.

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Liggett, Mark. "RQ-8A Fire Scout VTUAV Environmental Control System Development." In 8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3022.

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3

Strubergs, Aigars, Andis Lazdins, and Linards Sisenis. "Evaluation of compliance of existing forest machine information systems for the implementation of the standard StanForD 2010." In Research for Rural Development 2020. Latvia University of Life Sciences and Technologies, 2020. http://dx.doi.org/10.22616/rrd.26.2020.010.

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The aim of the study is to clarify the compliance of machinery information systems used by Latvian logging service providers with the requirements of the Forest Machine Data and Communications Standard StanForD 2010. For determining the number of logging machines and structure registered in Latvia, data from the State Technical Control Agency of Latvia (VTUA) has been used. This dataset includes 2094 registered machinery units from which 1663 units recorded as harvesters and forwarders are distributed for data processing. Using the national AS Latvian State Forests (LSF) database, where 541 machinery units have been recorded, of which 239 harvesters and 302 forwarders, it is determined what and how many machines already use the standard StanForD 2010, how many machines can implement it and which machines are not suitable for the implementation of StanForD 2010. The study showed that the VTUA register does not fully reflect the true quantity of harvesting machines in Latvia and does not provide information about the use of machines. The LSF data provide reliable information on the possibilities of using StanForD 2010 in harvesters in national forests. From the harvesters working in the country’s forests, 52% of the machines uses the StanForD 2010 standard. Work should be continued to clarify the possible use of the standard in the machines working in private forests. Similarly, work should be continued with dealers of harvesting machines to identify models for which it is possible to adjust the StanForD 2010 standard and what the cost of adapting the indicative information systems is.
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Astrov, I. "Two-rate motion control of VTAV by NARMA-L2 controller for enhanced situational awareness." In 2016 39th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO). IEEE, 2016. http://dx.doi.org/10.1109/mipro.2016.7522309.

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