Relevant bibliographies by topics / Jet blast

Academic literature on the topic 'Jet blast'

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Published: 14 March 2023

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Journal articles on the topic "Jet blast"

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Masato, Taguchi, Semba Naoki, Mori Koichi, Nakamura Yoshiaki, and Ishiko Keiichi. "1037 EXPERIMENTAL STUDY ON JET BLAST AT LABOLATORY SCALE." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1037–1_—_1037–5_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1037-1_.

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Su, Dengfeng, Dandan Zheng, and Lingang Zhao. "Experimental Study and Numerical Simulation of Dynamic Stress-Strain of Directional Blasting with Water Jet Assistance." Shock and Vibration 2019 (March 24, 2019): 1–15. http://dx.doi.org/10.1155/2019/1659175.

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Effective control of the explosive energy and the propagation direction of blast-induced crack and minimizing damage of remaining rock mass are the main purposes of directional-controlled blasting. In this paper, the experimental test on blast strain fields affected by water jet slot and blasthole wall protection material is conducted. Next, the FEM software ANSYS/LSDYNA is used to simulate the blast‐induced crack propagation and the blast stress wave transmission of different types of blasthole, and the distribution and evolution law of dynamic blast stress are also analyzed. The results indicate that the existence of blasthole wall protection material is not only beneficial to the “guiding effect” of blast‐induced crack propagation of water jet slot but also beneficial to reduce blast-induced damage of remaining rock mass. Besides, the bigger Dm/rb is, the weaker the “guiding effect” and “blasthole wall protection effect” by water jet slot and wall protection material are.
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Wang, Haifu, Liangcai Cai, Xiaolei Chong, and Hao Geng. "Experimental Study of the Jet Engine Exhaust Flow Field of Aircraft and Blast Fences." PROMET - Traffic&Transportation 27, no. 2 (April 24, 2015): 181–90. http://dx.doi.org/10.7307/ptt.v27i2.1545.

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A combined blast fence is introduced in this paper to improve the solid blast fences and louvered ones. Experiments of the jet engine exhaust flow (hereinafter jet flow for short) field and tests of three kinds of blast fences in two positions were carried out. The results show that the pressure and temperature at the centre of the jet flow decrease gradually as the flow moves farther away from the nozzle. The pressure falls fast with the maximum rate of 41.7%. The dynamic pressure 150 m away from the nozzle could reach 58.8 Pa, with a corresponding wind velocity of 10 m/s. The temperature affected range of 40°C is 113.5×20 m. The combined blast fence not only reduces the pressure of the flow in front of it but also solves the problems that the turbulence is too strong behind the solid blast fences and the pressure is too high behind the louvered blast fences. And the pressure behind combined blast fence is less than 10 Pa. The height of the fence is related to the distance from the jet nozzle. The nearer the fence is to the nozzle, the higher it is. When it is farther from the nozzle, its height can be lowered.
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Apazidis, N., S. Sembian, and M. Liverts. "Supersonic jet by blast wave focusing." Physics of Fluids 33, no. 12 (December 2021): 126101. http://dx.doi.org/10.1063/5.0068309.

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Su, Dengfeng, Yong Kang, Dongyang Li, Xiaochuan Wang, and Fuwen Yan. "Analysis and Numerical Simulation on the Reduction Effect of Stress Waves Caused by Water Jet Slotting Near Blasting Source." Shock and Vibration 2016 (2016): 1–18. http://dx.doi.org/10.1155/2016/5640947.

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As one of the most serious “side effects” of blast excavation, blast-induced vibration must be controlled for existing buildings and human beings. This paper proposes a method for blast-induced vibration reduction with water jet assistance according to the cutting characters of low-noised, environment-friendly water jet. The mechanism of vibration-isolation with water jet assistance was analyzed, and the stress wave energy attenuation models were established based on blasting theory and stress wave theory. Influence law on shock wave attenuation by vibration-isolation slot was studied by numerical simulation. Simulation results agree with the theoretical analysis roughly. The results of this study put forward a method for blast-induced vibration near blasting source and provide a certain theoretical basis.
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Worden, Theodore J., Chiang Shih, and Farrukh S. Alvi. "Supersonic Jet Impingement on a Model-Scale Jet Blast Deflector." AIAA Journal 55, no. 8 (June 2017): 2522–36. http://dx.doi.org/10.2514/1.j055664.

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Kumar, Abhijeet, and Srikrishna Sahu. "Liquid jet breakup unsteadiness in a coaxial air-blast atomizer." International Journal of Spray and Combustion Dynamics 10, no. 3 (March 22, 2018): 211–30. http://dx.doi.org/10.1177/1756827718760905.

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The aim of this paper is to experimentally characterize the liquid jet breakup unsteadiness in a coaxial air-blast atomizer. The current research focuses on the measurement of the fluctuations of the jet breakup length and the flapping instability of the liquid jet, which contribute to the downstream fluctuations of the spray characteristics. The optical connectivity technique was used to measure the instantaneous breakup length of the water jet. Also, time resolved shadowgraph images of the primary jet breakup process were captured by high-speed imaging to characterize the jet instabilities at different axial locations from the atomizer exit. Experiments were performed for a wide range of air-to-liquid momentum flux ratio ( M) and aerodynamic Weber number ( Weg) corresponding to membrane- and/or fiber breakup mode of the jet disintegration process. The mean jet breakup length was found to vary inversely with M through a power law relation in agreement with the literature, while the breakup length fluctuations were found to first decrease and then increase with M. In order to capture the unsteady dynamics of the jet breakup process, the proper orthogonal decomposition analysis of the optical connectivity images was performed. The jet flapping and the fluctuations of the jet breakup length were identified as the second and the third spatial proper orthogonal decomposition modes, respectively, for all operating conditions of the atomizer. The amplitude and the frequency of the instabilities were measured by temporal tracking of the liquid–air interface on the shadowgraph images. The disturbance close to the injector exit corresponds to the Kelvin–Helmholtz instability, while close to the jet breakup point the jet exhibits the flapping instability, which is characterized by lateral oscillation of the jet about the atomizer axis. The influence of the liquid jet Reynolds number and momentum flux ratio on the KH and the flapping instabilities are examined.
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Ma, Song, Jianguo Tan, Xiankai Li, and Jiang Hao. "The effect analysis of an engine jet on an aircraft blast deflector." Transactions of the Institute of Measurement and Control 41, no. 4 (March 26, 2018): 990–1001. http://dx.doi.org/10.1177/0142331218755892.

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This paper establishes a novel mathematical model for computing the plume flow field of a carrier-based aircraft engine. Its objective is to study the impact of jet exhaust gases with high temperature, high speed and high pressure on the jet blast deflector. The working condition of the nozzle of a fully powered on engine is first determined. The flow field of the exhaust jet is then numerically simulated at different deflection angle using the three-dimensional Reynolds averaged Navier–Stokes equations and the standard [Formula: see text]-[Formula: see text] turbulence method. Moreover, infra-red temperature tests are further carried out to test the temperature field when the jet blast deflector is at the [Formula: see text] deflection angle. The comparison between the simulation results and the experimental results show that the proposed computation model can perfectly describe the system. There is only 8–10% variation between them. A good verification is achieved. Moreover, the experimental results show that the jet blast deflector plays an outstanding role in driving the high-temperature exhaust gases. It is found that [Formula: see text] may be the best deflection angle to protect the deck and the surrounding equipment effectively. These data results provide a valuable basis for the design and layout optimization of the jet blast deflector and deck.
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Loob, William. "Blast from the Past." Mechanical Engineering 121, no. 08 (August 1, 1999): 64–66. http://dx.doi.org/10.1115/1.1999-aug-6.

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This article presents a review about the jet engine testing facilities of the Naval Air Warfare Center Aircraft Division in Trenton, NJ, that had to be moved to a base run by another branch of the military, the Arnold Engineering Development Center at Arnold Air Force Base in Tennessee. The jet engine testing complex at Trenton had been built in the 1950s. The restriction effectively ruled out any upgrades so long as the Navy’s engine test requirements could be met by replicating the capabilities of the old facility. The natural tendency of the engineers and planners looking at the project was to think immediately about how the facility could be improved with modern designs. For the restriction on not improving the test capability at Trenton, the project ironically provided an expansion of services. This is built to subject the Navy engines to definite environmental conditions, and as long as the Navy has that kind of test requirement. It is a capability that is available not only to the Navy and Air Force, but to the Army, Marines, and private industry as well.
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IMAIZUMI, Jun, Hatsuhiko USAMI, and Junji SUGISHITA. "2131 Development of slurry jet blast machining." Proceedings of the JSME annual meeting 2005.1 (2005): 571–72. http://dx.doi.org/10.1299/jsmemecjo.2005.1.0_571.

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Dissertations / Theses on the topic "Jet blast"

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Gorlach, Igor Alexandrowich. "Thermal stress evaluation of thermo-blast jet nozzle materials / I.A. Gorlach." Thesis, North-West University, 2004. http://hdl.handle.net/10394/352.

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In the last few years a new method for surface preparation has evolved, namely thermo-abrasive blasting. This technique utilises a high enthalpy thermal jet to propel abrasive particles. The thermo-abrasive blasting gun, also called a thermal gun, is based on the principles of High Velocity Air Fuel (HVAF) processes. Nozzles used for thermo-abrasive blasting are subjected to thermal loading, wear and mechanical stresses. Therefore, the nozzle geometry and materials are critical for reliable performance of a thermo-abrasive system. In this investigation, the thermal stresses developed in the nozzle materials for thermo-abrasive blasting were analysed. The analytical and the computational models of the thermo-abrasive gun and the nozzle were developed. The computational fluid dynamics, thermal and structural finite element analyses have been employed in this study. The nozzle materials investigated were tungsten carbide, hot pressed silicon carbide, nitride-bonded cast silicon carbide and SIALON. The simulation and experimental results show that the highest thermal stresses occur during the first two minutes from the start of the thermal gun. However, thermal stresses are also high after the system is shut off. The nozzle geometry was optimised, which provided high cleaning rates with evidence of improved thermal loading, based on the experimental results. A new design of the thermal gun and the ignition method associated with a HVAF system were developed in this study. It is also concluded that the computation fluid dynamic and the finite element technique can be used to optimise the design of thermo-abrasive blasting nozzles.
Thesis (Ph.D. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2004.
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Marocchino, Alberto. "Magnetohydrodynamic modelling of supersonic jets and colliding blast waves for laboratory astrophysics investigation." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/4668.

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The thesis is related to laboratory astrophysics, and investigates with this technique, the launching mechanism for young stellar object jets and the interaction of two supernovae remnant in the Sedov-Taylor regime. Recent experiments performed at Imperial College on the pulsed-power magpie facility have successfully shown the formation of magnetically driven radiatively cooled plasmas jets formed from radial wire arrays, which are relevant to studying the launching mechanisms of astrophysical jets [A. Ciardi, et al. Phys. Plasmas 14, p056501 (2007)]. The experiments have been now extended to study episodic mass ejection ( 25 ns [F. A. Suzuki-Vidal, et al. 49th Annual Meeting of the Division of Plasma Physics, UO4.00007 (2007)]) and the interaction of jets and magnetic bubbles with an ambient gas. The dynamics of the interaction is investigated through three-dimensional resistive magneto-hydrodynamic simulations using the code gorgon [A. Ciardi, et al. Phys. Plasmas 14, p056501 (2007) – J.P. Chittenden, et al. Plasma Phys. Control. Fusion 46 B457 (2004)]. In particular ablation of the cathode is investigated numerically to explain the periodicity and subsequent formation of multiple bubbles. Comparison with experiments is offered to validate the results. The complex structure of the magnetic field is investigated, the conservation of the magnetic flux is explained and the consequent confinement offered to the central jet. Furthermore the interaction of the plasma outflows with an ambient gas is investigated. The formation of shocks in the ambient gas, as well as the formation of three-dimensional Mach stems is analyzed. In addition, recent experiment at Imperial College performed by the QOLS group, by laser-heating a medium of atomic clusters [R. A. Smith, et al. 2007 Plasma Phys. Control. Fusion 49 B117-B124 (2007)], shows the capability to create plasmas with sufficiently high energy densities to launch strong shocks. Interactions between high-Mach number shock waves are believed to be responsible for many of the complex, turbulent structures seen in astrophysical objects including supernova remnants. The experiment of two colliding Sedov-Taylor regime blast-waves is modelled. Detailed 3D numerical modeling is performed in order to study the importance of thermal conduction, rarefaction waves, refractive shock waves and complex three-dimensional mach stem formation. The simulated data are benchmark against a three-dimensional tomography image (newly developed experimental technique). The collision of two blast-waves should reproduce the non uniform interstellar medium where supernovas normally expand.
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Rodriguez, Vincent. "Etude de la formation de jets issus de la dispersion d'un anneau de particules solides par onde de choc." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4750/document.

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La dispersion de particules par une onde de souffle ou de choc induit la formation de structures régulières qui prennent la forme de jets de particules. Jusqu'à présent, les expériences n'ont été réalisées qu'en trois dimensions rendant difficile l'exploitation des données. Dans cette étude, une onde de souffle, générée à l'extrémité d'un tube à choc, débouche au centre d'un anneau de particules solides initialement confiné dans une cellule de Hele-Shaw. Pour la première fois, à partir d'une expérience de laboratoire, la formation de jets de particules est observée dans une configuration quasi bi-dimensionnelle et pour de faibles niveaux de pression. Grâce à un système de visualisation ultra-rapide, il a été mis en évidence que la sélection du nombre de jets de particules est un processus instationnaire. Nous avons observé que les jets de particules sont initialement formés à l'intérieur de l'anneau et sont ensuite expulsés à l'extérieur du front de particules en expansion. L'influence de nombreux paramètres, tels que la densité et le diamètre des particules, la surpression générée et la géométrie de l'anneau, ont été étudiées. La synthèse des résultats expérimentaux obtenus a permis d'établir certaines relations empiriques reliant le nombre de jets aux propriétés initiales. De plus, la formation de fines perturbations sur le front externe de la couche de particules a été observée. Ce phénomène est quant à lui indépendant des jets principaux et dépend seulement de la nature des particules
The dispersion of particles by a blast or a shock wave induces the formation of coherent structures which take the form of particle jets. All the experiments conducted so far have been performed in three-dimensional geometry. In the present study, a blast wave, issuing from the discharge of a planar shock wave at the exit of a conventional shock tube, is generated in the center of a granular medium ring initially confined inside a Hele-Shaw cell. With the present experimental set-up, under impulsive acceleration, a solid particle jet formation is clearly obtained and observed in a quasi-two-dimensional configuration, for the first time. From fast flow visualizations, we highlighted that the selection of the number of jets is unsteady. We noticed, in all instances, that the jets are initially generated inside the particle ring and thereafter expelled outward. This point has not been observed in three-dimensional experiments. The influence of many parameters such as density and diameter of particles, the generated pressure and the geometry of the ring, has been studied. Empirical relationships were deduced from the experimental curves. Moreover, we observed in detail the formation of very thin perturbations created around the external surface of the dispersed particle layer. This phenomenon is independent of the main jet formation and solely depends on the nature of particles
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HUANG, REN-ZHI, and 黃人智. "A study of a blast shock induced supersonic jet impinging on an airfoil." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/85659668720485242089.

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MAROCCHINO, ALBERTO. "Magnetohydrodynamic modelling of supersonic jets and colliding blast waves for laboratory astrophysics investigation." Doctoral thesis, 2009. http://hdl.handle.net/11573/394292.

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The thesis is related to laboratory astrophysics, and investigates with this tech- nique, the launching mechanism for young stellar object jets and the interaction of two supernovae remnant in the Sedov-Taylor regime. Recent experiments per- formed at Imperial College on the pulsed-power magpie facility have successfully shown the formation of magnetically driven radiatively cooled plasmas jets formed from radial wire arrays, which are relevant to studying the launching mechanisms of astrophysical jets [A. Ciardi, et al. Phys. Plasmas 14, p056501 (2007)]. The experiments have been now extended to study episodic mass ejection ( 25 ns [F. A. Suzuki-Vidal, et al. 49th Annual Meeting of the Division of Plasma Physics, UO4.00007 (2007)]) and the interaction of jets and magnetic bubbles with an ambi- ent gas. The dynamics of the interaction is investigated through three-dimensional resistive magneto-hydrodynamic simulations using the code gorgon [A. Ciardi, et al. Phys. Plasmas 14, p056501 (2007) – J.P. Chittenden, et al. Plasma Phys. Con- trol. Fusion 46 B457 (2004)]. In particular ablation of the cathode is investigated numerically to explain the periodicity and subsequent formation of multiple bub- bles. Comparison with experiments is offered to validate the results. The complex structure of the magnetic field is investigated, the conservation of the magnetic flux is explained and the consequent confinement offered to the central jet. Furthermore the interaction of the plasma outflows with an ambient gas is investigated. The for- mation of shocks in the ambient gas, as well as the formation of three-dimensional Mach stems is analyzed. In addition, recent experiment at Imperial College per- formed by the QOLS group, by laser-heating a medium of atomic clusters [R. A. Smith, et al. 2007 Plasma Phys. Control. Fusion 49 B117-B124 (2007)], shows the capability to create plasmas with sufficiently high energy densities to launch strong shocks. Interactions between high-Mach number shock waves are believed to be responsible for many of the complex, turbulent structures seen in astrophysical ob- jects including supernova remnants. The experiment of two colliding Sedov-Taylor regime blast-waves is modelled. Detailed 3D numerical modeling is performed in order to study the importance of thermal conduction, rarefaction waves, refractive shock waves and complex three-dimensional mach stem formation. The simulated data are benchmark against a three-dimensional tomography image (newly devel- oped experimental technique). The collision of two blast-waves should reproduce the non uniform interstellar medium where supernovas normally expand.
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Mohan, Avulapati Madan. "Air-Assited Atomization Strategies For High Viscosity Fuels." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2506.

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Atomization of fuel is an important pre-requisite for efficient combustion in devices such as gas turbines, liquid propellant rocket engines, internal combustion engines and incinerators. The overall objective of the present work is to explore air-assisted atomization strategies for high viscosity fuels and liquids. Air-assisted atomization is a twin-fluid atomization method in which energy of the gas is used to assist the atomization of liquids. Broadly, three categories of air-assisted injection, i.e., effervescent, impinging jet and pre-filming air-blast are studied. Laser-based diagnostics are used to characterize the spray structure in terms of cone angle, penetration and drop size distribution. A backlit direct imaging method is used to study the macroscopic spray characteristics such as spray structure and spray cone angle while the microscopic characteristics are measured using the Particle/droplet imaging analysis (PDIA) technique. Effervescent atomization is a technique in which a small amount of gas is injected into the liquid at high pressure in the form of bubbles. Upon injection, the two-phase mixture expands rapidly and shatters the liquid into droplets and ligaments. Effervescent spray characteristics of viscous fuels such as Jatropha and Pongamia pure plant oils and diesel are studied. Measurements are made at various gas-to-liquid ratios (GLRs) and injection pressures. A Sauter Mean Diameter (SMD) of the order of 20 µm is achieved at an injection pressure of 10 bar and GLR of 0.2 with viscous fuels. An image-based method is proposed and applied to evaluate the unsteadiness in the spray. A map indicating steady/unsteady regime of operation has been generated. An optically accessible injector tip is developed which has enabled visualization of the two-phase flow structure inside the exit orifice of the atomizer. An important contribution of the present work is the correlation of the two-phase flow regime in the orifice with the external spray structure. For viscous fuels, the spray is observed to be steady only in the annular two-phase flow regime. Unexpanded gas bubbles observed in the liquid core even at an injection pressure of 10 bar indicate that the bubbly flow regime may not be beneficial for high viscosity oils. A novel method of external mixing twin-fluid atomization is developed. In this method, two identical liquid jets impinging at an angle are atomized using a gas jet. The effect of liquid viscosity (1 cP to 39 cP) and surface tension (22 mN/m to 72 mN/m) on this mode of atomization is studied by using water-glycerol and water-ethanol mixtures, respectively. An SMD of the order of 40 µm is achieved for a viscosity of 39 cP at a GLR of 0.13 at a liquid pressure of 8 bar and gas pressure of 5 bar. It is observed that the effect of liquid properties is minimal at high GLRs where the liquid jets are broken before the impingement as in the prompt atomization mode. Finally, a pre-filming air-blast technique is explored for transient spray applications. An SMD of 22 µm is obtained with diesel at liquid and gas pressures as low as 10 bar and 8.5 bar, respectively. With this technique, an SMD of 44 µm is achieved for Jatropha oil having a viscosity 10 times higher than that of diesel.
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Balstad, Marit. "”Men jeg er jo ikke leder, jeg er bibliotekar” : En spørreundersøkelse om ledermotivasjon blant bibliotekutdannede i norske folkebibliotek." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23249.

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There is a notion that library and information science (LIS) educated professionals are unwilling to take on leadership responsibilities. However, this has not been systematically documented. Therefore, this study’s aim is to provide empirical knowledge about LIS educated professionals’ willingness to become leaders, and what motivates them to become and stay leaders – or not. Based on research on what leaders do, what motivates people to lead, and former library leadership studies, a survey was conducted among employees in Norwegian public libraries. 210 respondents completed the survey. Most of the respondents were leaders (63,8 %), and 9 % wanted to become leaders. The study provides no evidence that LIS educated professionals are unwilling to take on leadership responsibilities. Further, we find that 70 % of all respondents agree that library leaders are satisfied in their job. The study gives important insight into what motivates LIS professionals to lead or not. Reasons to become a leader are first and foremost a drive to develop and change libraries. Leadership tasks are considered exciting and stimulating. The study also suggests a relatively lower need for affiliation among those who become leaders. Reasons not to become a leader are fear of losing LIS tasks (e.g. fear of losing affiliation to the profession), to avoid budgeting and human resources tasks, lack of competence, to avoid responsibility, stress, and/or a heavy workload, lack of resources in public libraries, not holding “the traits of leaders”, and that the salary doesn’t make up for the disadvantages.
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Books on the topic "Jet blast"

1

Savanick, G. A. Abrasive-enhanced water-jet drill for hard rocks. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1989.

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Andenæs, Johannes. Et liv blant paragrafer: Juridiske stridsspørsmål slik jeg så dem. Oslo: Gyldendal, 1987.

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Jet Blast. Tate Publishing, 2014.

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Jet Blast and the Hand of Fate. Redline Books, 2007.

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Carbone, Stephen. Air Crash Files : Jet Blast: A Daniel Tenace Novel. Independently Published, 2017.

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Construction and Testing of the ARL 1.68-m Diameter Shock Tube Exit Jet Spreader for Non-Ideal Blast Simulation. Storming Media, 1997.

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Lødding, Berit. For ellers far jeg ikke jobb etterpa--: Søkning, opptak og progresjon i videregaende opplæring blant tospraklig ungdom : Evaluering av Reform 94, underveisrapport høsten 1996 (Rapport). NIFU, Norsk institutt for studier av forskning og utdanning, 1997.

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Book chapters on the topic "Jet blast"

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Drake, R. P., and J. P. Knauer. "Design of jet-driven, radiative-blast-wave experiments for 10 kJ class lasers." In High Energy Density Laboratory Astrophysics 2008, 97–100. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-90-481-9999-0_16.

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Rodriguez, V., R. Saurel, G. Jourdan, and L. Houas. "Study on the Jet Formation During Dispersal of Solid Particles by Shock and Blast Waves." In 30th International Symposium on Shock Waves 1, 745–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-46213-4_128.

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Melber-Wilkending, S. "Aerodynamic Analysis of Jet-Blast using CFD considering as example a Hangar and an AIRBUS A380 configuration." In New Results in Numerical and Experimental Fluid Mechanics V, 152–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_19.

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Hazell, Paul J. "Bullets, Blast, Jets and Fragments." In Armour, 51–108. 2nd ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003322719-3.

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"jet blast carpet machine." In The Fairchild Books Dictionary of Textiles. Fairchild Books, 2021. http://dx.doi.org/10.5040/9781501365072.8364.

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"Bullets, Blast, Jets and Fragments." In Armour, 49–90. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2015. http://dx.doi.org/10.1201/b18683-4.

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Hellesø, Ragnhild, and Maren Sogstad. "KAPITTEL 4 «Jeg vet ikke hvorfor det er så vanskelig å skrive om det» – sykepleieres refleksjoner om sin journalføring." In Digitalisering i sykepleietjenestenen – en arbeidshverdag i endring, 73–89. Cappelen Damm Akademisk/NOASP, 2019. http://dx.doi.org/10.23865/noasp.71.ch4.

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Sykepleieres journalføring har vært debattert og kritisert. I dette kapitlet søker vi å få en dypere forståelse for de underliggende prosesser og vurderinger som sykepleierne gjør, og hvordan de reflekterer over sin dokumentasjonspraksis. Hensikten er å få innsikt i og økt kunnskap om hva som påvirker de valg de tar når de skal skrive journal. Kapitlet bygger på to studier blant sykepleiere i spesialist- og kommunehelsetjenesten hvor de reflekterer rundt sin journalføringspraksis. Vi ser at sykepleierne inngår i en samfunnsdiskurs som vanskeliggjør å journalføre ikke-kroppslige helseutfordringer fordi de kan være forbundet med skam. Pasientenes rett til å vite hva som er dokumentert om dem, gjør at sykepleierne må balansere ulike hensyn og interesser.
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Høst, Sigurd. "Å telle aviser. Bakgrunn, kilder, problemer og erfaringer." In Presse, profesjon og politikk: Festskrift til Paul Bjerke, 63–88. Cappelen Damm Akademisk/NOASP, 2022. http://dx.doi.org/10.23865/noasp.169.ch3.

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På 1980-tallet dekket avisstatistikken bare de avisene som var medlemmer av Norske Avisers Landsforening. Derfor var det mange aviser, særlig små lokalaviser, som ikke var tatt med. Ingen visste hvor mange det var av dem, og hvor mange aviser det ble til sammen. For å skaffe mer nøyaktige tall begynte jeg å lage et register som skulle dekke alle norske aviser. Den første utgaven var ferdig i 1990, og resultatene ble blant annet brukt av det dagspresseutvalget som ble oppnevnt i 1991. Senere har registeret vært grunnlag for Avisåret, en serie med årlige tabell- og kommentarrapporter som har dekket hele perioden fra 1994 og frem til 2020. De første utgavene av rapporten gjaldt bare vanlige aviser, det vi i dag vil kalle betalte papiraviser. Senere er rapportene utvidet med tidsserier som gjelder avisenes nyhetssider på internett (fra 1996), gratisaviser på papir (fra 1999) og betalte nettaviser (fra 2017). Artikkelen beskriver arbeidet med registeret og statistikken, og det er lagt spesiell vekt på kildebruk og metodeproblemer. For den som er vokst opp med Google, kan det være vanskelig å forestille seg en situasjon der nesten alt kildearbeid handlet om å finne frem til, og å vurdere, informasjon på papir.
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Conference papers on the topic "Jet blast"

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Worden, Theodore J., Chiang Shih, and Farrukh S. Alvi. "Supersonic Jet Impingement on a Model-scale Jet Blast Deflector." In 54th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-1015.

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Jaiswal, Abhijeet, Ashwin S. Dhoble, and D. J. Tidke. "High Compressible Flow Through Jet Blast Deflector." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4699.

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Jet blast impact on aerofoil blade of the deflector is studied which redirects the high energy exhaust of jet engine during the ground testing. The geometric model of aerofoils is designed with structured mesh around the aerofoil in rectangular domain generated in ICEM 16 software. The jet blast impact on aerofoil blade of the deflector is numerically simulated with SST k-ω model based on CFD theory. The fluid flow is high-speed compressible flow and flowing fluid air is considered as an ideal gas and also Sutherland’s law viscosity is applied to account for the dependence of molecular viscosity on temperature. Flow is taken as first order upwind and flux type is AUSM (Advection Upstream Splitting Method) to get an exact resolution of contact and shock discontinuities. The distribution of temperature, pressure, velocity and streamline of fluid flow is numerically simulated by FLUENT 16 software and layout of eddies generation behind aerofoil is generated in Tecplot 360 software. The coefficient of lift (Cl) and the coefficient of drag (Cd) are calculated to study the impact on aerofoil blade in horizontal and vertical direction. The result indicates that the method presented in this paper can analyze the fluid behavior on the complicated geometry of aerofoil blade that the flow between two adjacent aerofoil blades obtains a highly reliable simulation result. The value of lift force is negative i.e it holds the deflector towards the ground, so optimum balance between drag force and lifts force is obtained by simulating at a different angle of attack and pitch. Through CFD numerical simulation at a different angle of attack and pitch, the best result is obtained and conductive suggestions can be given for the adaptation of the JBD blade.
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Alostaz, Yousef, Mark Fantozzi, and Peter Feenstra. "Innovative Jet Blast Deflector System: Analysis and Design." In Structures Congress 2015. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479117.185.

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Ricardo Augusto de Barros Leite, Flavius Portella Ribas Martins, and Agenor de Toledo Fleury. "Dynamic simulation of a peen forming jet blast." In 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-0443.

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"Fly Ash and Slag Jet-Blast Resistant Concretes." In "SP-153: Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete Proceedings Fifth International Conference Milwauk". American Concrete Institute, 1995. http://dx.doi.org/10.14359/1111.

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Erwin, James, Neeraj Sinha, and Gregory Rodebaugh. "Noise predictions of a hot twin-jet impinging on a jet blast deflector." In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-324.

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Slaboch, Paul. "An Operational Model for the Prediction of Jet Blast." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1229.

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Tangen, Steven. "Investigating Separated Shear Layers for Passive Jet Blast Deflector Cooling." In 44th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-144.

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Ishiko, Keiichi, Atsushi Hashimoto, Yuichi Matsuo, and Shigeya Watanabe. "Numerical Examination of the Effect of Cross-Wind on Jet Blast." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-862.

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Boisson, T. "1.6 - HAZARD2 project : airspeed and temperature measurements in jet engine blast." In etc2014 - 34. European Telemetry and Test Conference. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2014. http://dx.doi.org/10.5162/etc2014/1.6.

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Reports on the topic "Jet blast"

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Njå, Ove, and Kirsti Russell Vastveit. Norske kommuners planlegging, gjennomføring og bruk av risiko- og sårbarhetsanalyse i forbindelse med samfunnssikkerhetsarbeidet. University of Stavanger, October 2016. http://dx.doi.org/10.31265/usps.164.

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I prosjektet; «Helhetlig ROS-analyse i norske kommuner» analyserer vi hvordan kommuner utvikler, bruker og oppdaterer ROS-analyser og risikoforestillinger i sitt samfunnssikkerhetsarbeid. Det legges vekt på hvordan kommuner integrerer ROS-arbeidet og risikoforestillinger i eksisterende plan- og arbeidsprosesser. Hvilke utfordringer opplever kommunene i dette arbeidet? Etter å ha jobbet med risiko og sikkerhet i mer enn 20 år, og en vesentlig del av disse opp mot kommuner, er det etter vårt syn et gjennomgående trekk at kommunalt ansatte som jobber med sikkerhet og beredskap har stor skepsis til akademikere på dette feltet. Den teoretiske «verden» er ikke i stand til å kommunisere med den praktiske og vice versa. Denne utfordringen mener vi står sterkt også i dag, og dermed ble det i prosjektet viktig å finne ut hvordan begrepene ble brukt i kommunene. Hvor kritiske er begrepene for omfanget av bruken av analysene? Står vi ved et markant skille nå med innføring av ny veileder for helhetlig ROS-analyse i kommuner? Eller, er arbeidet omkring samfunnssikkerhet og beredskap fastnet i en praksis uten påvirkning fra ROS-analyse? Datamateriale fra 26 kommuner er inkludert i studien. Kommunene dekker alle landsdelene og de har varierte demografiske og geografiske profiler. Blant deltagerne er kommuner med storulykkesindustri, større bykommuner, mindre øykommuner og grensekommuner. Opptil fem personer med ulikt ansvar for samfunnssikkerhets- og beredskapsarbeidet er intervjuet i hver kommune. En viktig del av prosjektet er forholdet mellom ROS-analyser på ulike forvaltningsnivåer, hvordan ROS-analysene kommuniserer risikoforestillinger og hvordan kommunene kan bygge på og hente innspill fra hverandre i ROS-analysearbeidet. Siden 2010 har Lov om kommunal beredskapsplikt, sivile beskyttelsestiltak og Sivilforsvaret (sivilbeskyttelsesloven) og underliggende Forskrift om kommunal beredskapsplikt stilt krav til kommunenes ROS-analyse og samfunnssikkerhetsarbeid i stort. Likevel er det ikke opplagt hva det innebærer. Forskriften snakker om begreper og konsepter som; - Jobbe systematisk og helhetlig med samfunnssikkerhet; - Forankring i kommunestyret; - Eksisterende og fremtidige risiko- og sårbarhetsfaktorer; - Særlige utfordringer; - Langsiktige mål, strategier, prioriteringer og plan for oppfølging av samfunnssikkerhets- og beredskapsarbeidet; - Vurdere forhold som bør integreres i planer og prosesser; og - Overordnet beredskapsplan. Det stiller store krav til kommunens ansattes kunnskap og kompetanse til å fortolke hva alle disse konseptene skal bety for kommunen og hvordan ansatte skal jobbe med kravene. Her ligger kjernen av vår studie. Studien vår viser at det legges betydelig med ressurser og arbeid ned i kommuners helhetlige ROS-analyser, samfunnssikkerhets og beredskapsarbeid. Risikoinformert styring og risikotenkning er en krevende filosofi, hvor det forutsettes at de ansatte med ansvar for kommunens systemer og samfunnssikkerhets- og beredskapsarbeidet har høy kompetanse på området. I kommunene som deltok i studien synes det å være enklere for kommunene å konkretisere hvordan de arbeidet med beredskap enn med samfunnssikkerhet. Kommunene hadde i varierende grad oversikt over hvordan beredskapsarbeidet var satt i system på tvers av etater. Materialet ble analysert ut fra fire forhold: - Begrepsforståelser og bruk av begreper for å uttrykke samfunnssikkerhet - Planlegging og gjennomføring av ROS-analyseprosesser - Presentasjon av resultater fra ROS-analysearbeidet - Implementering av analyseresultatene i kommunens aktiviteter Datamaterialet viser at kommunene og de fleste respondentene våre er i liten grad bekymret over begrepene de bruker. I hovedsak er det risiko, ROS-analyse (eller andre koplinger av ROS), hendelser, akseptkriterier, beredskap, kriseplaner og tiltak som er konseptene i bruk. Usikkerhet var et begrep som fulgte med, men det var i liten grad reflektert over utover at det var en egenskap med hele ROS-analyseprosessene. Samfunnssikkerhet, ytelse av beredskapstiltak, sårbarhet, resiliens, barrierer, system er begreper som får lite eller ingen omtale i kommunenes befatning med samfunnssikkerhet og beredskap. Kommunene er veldige instrumentelle i arbeidet med å utvikle produktene (helhetlig) ROS-analyse og beredskap- og kriseplaner. Beslutningsprosessene som den helhetlige ROS-analysen er en del av, trekkes ikke frem som førende for hvordan ROS-analyser og samfunnssikkerhetsarbeidet gjøres. Fylkesmannen sin rolle som pådriver, rådgiver og tilsynsmyndighet var for de aller fleste kommunene beskrevet med positive fortegn. Alle analysene vi har hatt tilgang til er utført som grovanalyser (hazid-gjennomganger, scenariobeskrivelser, gruppediskusjoner), men med relativt små variasjoner innenfor hvordan risiko måles og uttrykkes. Enkelte kommuner inspireres av innholdet i FylkesROS-analyse eller Nasjonalt Risikobilde, mens andre har et større fokus på lokale forhold og hendelser. I forbindelse med bruk av tiltak fra helhetlig ROS-analyse var det en klar trend at kommunene synes det var vanskelig å sikre implementering av tiltak. Dette skyldes blant annet at det var utfordrende å sikre at den ansvarlige etat tok ansvar for tiltak, at beredskapskoordinatorer ikke anså tiltak som skulle implementeres i enkeltetater som sitt ansvar og at kommunene i mange tilfeller ikke hadde midler til gjennomføring av tiltak. Problemet kan trolig også spores til at helhetlig ROS-analyse ikke var et dokument som var i aktiv bruk i hverdagen til kommunenes ansatte, og som det i de fleste tilfeller ikke ble laget aksjonsplaner for å følge opp. På tiltakssiden var det også tydelig at flere kommuner gjorde det vanskelig for seg selv, ettersom de beskrev svært generelle tiltak i rapportene sine, tiltak som egentlig var på plass i den ansvarlige etat og som var dekket av andre internkontrollrutiner, eller som andre offentlige etater var ansvarlige for. Kommunene i prosjektet hadde i varierende grad koblet beredskapsplanene sine opp mot de helhetlige ROS-analysene. En annen utfordring i forbindelse med «bruk» til beredskapsplanlegging var at kommunene ikke var sikre på hvordan dette skulle tolkes. Skulle man lage øvelser basert på hendelsene som var brukt i helhetlig ROS-analyse, skulle det lages tiltakskort som passet til scenarioene i helhetlig ROS-analyse? Enkelte kommuner hadde inkludert hendelser fra helhetlig ROS-analyse i beredskapsplanverket sitt, mens andre hadde fokusert mer på felles kapasiteter i helhetlig ROS-analyse. Å se sammenhengen mellom helhetlig ROS-analyse og beredskapsplanlegging var et vanskelig tema for kommunene. Beredskapsanalyse og vurdering av «godheten» av beredskapstiltak er også en stor utfordring. Den største utfordringen og det viktigste funnet som har kommet fram gjennom studiet er at prinsippene i risikobasert styring er nærmest fraværende i kommunene. Funksjonelle krav til sikkerhet mangler, en levende diskusjon om samfunnssikkerhet og beredskap mangler, og analysene brukes i svært liten grad. ROS-analyse og intensjoner om risikobasert styring har vært i norske kommuner i mer enn 20 år, og basert på dette mener vi at det er kompetanse og reguleringsregimet det må gjøres noe med, heller enn å innføre nye veiledere og tilsynsaktiviteter. Ansvaret for kommunens samfunnssikkerhets- og beredskapsarbeid må knyttes opp mot spesifikk kompetanse. Det krever at kommunene endrer praksis på i den administrative ledelsen og virksomhetene som eier systemene, tjenestene og aktivitetene, så vel som i kommunikasjonen mellom administrativ og politisk ledelse når det gjelder samfunnssikkerhet og beredskap. Vi mener at politikeren fra bykommune 1 langs kysten i Nord-Norge illustrerer behovet på en betegnende måte: «Veldig få i beredskapsrådet har lest dokumentene. I vårt fylke tror jeg vi er noen av de som har kommet lengst, og det sier etter mitt skjønn sitt». «Vi må involvere oss på et mye tidligere stadium. Skaffe oss oversikt over hva som er beredskapsplanene, og hvor flaskehalsene er. Det tror jeg at jeg deler med veldig mange. Vi strykes med hårene i alt for stor grad. Vi får for mye ros.»
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