Relevant bibliographies by topics / Horizontal thrust

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Horizontal thrust'

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

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Journal articles on the topic "Horizontal thrust"

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Fitzpatrick, David, Giuseppe Cimadoro, and Daniel Cleather. "The Magical Horizontal Force Muscle? A Preliminary Study Examining the “Force-Vector” Theory." Sports 7, no. 2 (January 22, 2019): 30. http://dx.doi.org/10.3390/sports7020030.

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The force-vector theory contends that horizontal exercises are more specific to horizontal sports skills. In this context, the focus is on horizontal force production relative to the global coordinate frame. However, according to the principle of dynamic correspondence, the direction of force relative to the athlete is more important, and thus the basis for the force-vector theory is flawed. The purpose of this study was therefore to test the force-vector theory. According to the force-vector theory, hip thrust is a horizontally loaded exercise, and so hip thrust training would be expected to create greater improvements in horizontal jump performance than vertical jump performance. Eleven collegiate female athletes aged 18–24 years completed a 14-week hip thrust training programme. Pre and post testing was used to measure the following: vertical squat jump, vertical countermovement jump, horizontal squat jump, horizontal countermovement jump and hip thrust 3 repetition maximum (3RM). Subjects improved their 3 repetition maximum hip thrust performance by 33.0% (d = 1.399, p < 0.001, η2 = 0.784) and their vertical and horizontal jump performance (improvements ranged from 5.4–7.7%; d = 0.371–0.477, p = 0.004, η2 = 0.585). However, there were no differences in the magnitude of the improvement between horizontal and vertical jumping (p = 0.561, η2 = 0.035). The results of this study are contrary to the predictions of the force-vector theory. Furthermore, this paper concludes with an analysis of the force-vector theory, presenting the mechanical inconsistencies in the theory. Coaches should use the well established principle of dynamic correspondence in order to assess the mechanical similarity of exercises to sports skills.
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Chen, L., H. Zhou, Y. B. Wen, and D. P. Duan. "Control of the horizontal position of a stratospheric airship during ascent and descent." Aeronautical Journal 119, no. 1214 (April 2015): 523–41. http://dx.doi.org/10.1017/s0001924000010599.

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AbstractA stratospheric airship flies at a working altitude of 20km when it takes off from the ground. During ascent and descent, the wind field and thermal environment are highly complex. The thermal environment affects altitude, whereas wind influences the horizontal position of the airship. At a low altitude, this horizontal position cannot be controlled by thrusts given the low thrust-to-weight ratio, especially under a large wind field. However, it may be controlled indirectly by the pitch angle during ascent and descent with a certain vertical velocity. This study therefore proposes ascending and descending schemes for a stratospheric airship based on the thermal model. In this model, altitude is determined by the net lift/weight, whereas the horizontal position is controlled by the thrust and pitch. The pitch angle is determined by ballonets and an elevator. To allocate pitch control between the ballonets and the elevator under different airspeeds, pseudo-inverse dynamics of varied weight are introduced. In horizontal position control, the method of chain allocation is then applied between a pitch angle and vectored thrust to control the position of a stratospheric airship during ascent/descent.
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Imamura, Akitaka, Masafumi Miwa, and Junichi Hino. "Flight Characteristics of Quad Rotor Helicopter with Thrust Vectoring Equipment." Journal of Robotics and Mechatronics 28, no. 3 (June 17, 2016): 334–42. http://dx.doi.org/10.20965/jrm.2016.p0334.

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[abstFig src='/00280003/09.jpg' width=""300"" text='Thrust vectoring mechanisms for WRH' ] A quad rotor helicopter (QRH) is a radio controlled (RC) aircraft that tilts its attitude to generate a horizontal force component to move in a certain direction. Using autonomous control, the attitude control system tilts the airframe against disturbances, such as wind. Thus, the attitude of a flying QRH is always slanted. In this study, three types of deflecting thruster were compared to maintain the position and horizontal attitude of the QRH. The extra thrusters are tilted to generate a thrust against disturbances without causing the airframe to incline. It is suitable for precise measurements for which the airframe posture should remain horizontal.
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Kühn, Marvin, Corentin Toursel, and Jochen Schein. "Thrust Measurements on the High Efficient and Reliable Vacuum Arc Thruster (HERVAT)." Applied Sciences 11, no. 5 (March 4, 2021): 2274. http://dx.doi.org/10.3390/app11052274.

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In this work, thrust measurements of the high efficient and reliable vacuum arc thruster (HERVAT) are performed for different pulse energies. The thruster system includes a thruster head together with a newly developed pulse processing unit (PPU). The complete system (HERVAT + PPU) is able to perform more than 1 × 107 pulses. Moreover, the influence of an integrated active magnetic nozzle is investigated. As a result, the thrust to power ratio, the average thrust level and the impulse bit for each configuration are measured and calculated. For the thrust measurements, a highly sensitive horizontal thrust balance with an active force actuator is used and operated in the thrust compensation mode. The investigated system is able to achieve levels from 5 to 40 μN and thrust to power ratios from 1 to 2 μN/W. The experimental results are compared to the data available in literature.
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Subramanian, Ramakrishnan, and Arun Murugesan. "Horizontal Thrust in Vertically Curved Reinforced Concrete Beams." Practice Periodical on Structural Design and Construction 24, no. 2 (May 2019): 04019005. http://dx.doi.org/10.1061/(asce)sc.1943-5576.0000418.

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Marmo, Francesco. "ArchLab: a MATLAB tool for the Thrust Line Analysis of masonry arches." Curved and Layered Structures 8, no. 1 (January 1, 2021): 26–35. http://dx.doi.org/10.1515/cls-2021-0003.

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Abstract According to Heyman’s safe theorem of the limit analysis of masonry structures, the safety of masonry arches can be verified by finding at least one line of thrust entirely laying within the masonry and in equilibrium with external loads. If such a solution does exist, two extreme configurations of the thrust line can be determined, respectively referred to as solutions of minimum and maximum thrust. In this paper it is presented a numerical procedure for determining both these solutions with reference to masonry arches of general shape, subjected to both vertical and horizontal loads. The algorithm takes advantage of a simplification of the equations underlying the Thrust Network Analysis. Actually, for the case of planar lines of thrust, the horizontal components of the reference thrusts can be computed in closed form at each iteration and for any arbitrary loading condition. The heights of the points of the thrust line are then computed by solving a constrained linear optimization problem by means of the Dual-Simplex algorithm. The MATLAB implementation of presented algorithm is described in detail and made freely available to interested users (https://bit.ly/3krlVxH). Two numerical examples regarding a pointed and a lowered circular arch are presented in order to show the performance of the method.
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Artiukh, Viktor, Vladlen Mazur, and Liubov Shilova. "Device for Making Horizontal Wedge Thrust of Rolling Stand." MATEC Web of Conferences 106 (2017): 03002. http://dx.doi.org/10.1051/matecconf/201710603002.

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Qiao, Xu, Liu, and Wang. "Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model." Applied Sciences 10, no. 3 (January 22, 2020): 784. http://dx.doi.org/10.3390/app10030784.

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During the construction stage of the small radius TBM (tunnel boring machine) interval, the improper control of the boring parameters and the boring posture can cause the horizontal axis deviation of the shield tunnel. In order to address this issue, the TBM segments lining structure of the small radius interval is simplified as the continuous circular curved beam based on the longitudinal equivalent continuous model and Winkler elastic foundation beam theory. The theoretical model is solved through the transfer matrix method, and its applicability is verified by comparing it with the field monitoring data. It is found that the horizontal axis deviation of the completed tunnel increases with the total jack thrust, and the lateral displacement tends to be stable when the distance between the ring and the tail is far. The horizontal axis deviation has a negative relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is larger than that of inside the shield curve. The horizontal axis deviation has a positive relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is smaller than that of inside the shield curve.
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Li, Qi Jie, Jian Nong Gu, Zhi Hong Zhang, Chong Wang, Bao Ren Li, and Lei Gao. "Steady Motions Performance of an Underwater Glider with Pump on the Vertical Plane." Applied Mechanics and Materials 387 (August 2013): 310–13. http://dx.doi.org/10.4028/www.scientific.net/amm.387.310.

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The primary aim of research is to improve the speed of underwater glider to overcome the influence of ocean currents. In the paper, an autonomous underwater glider with pump was developed, and its vertical plane motion equations were established. In addition, the glider’s vertical plane motions were simulated. The results show, compared with no thrust, when the amount of volume change is 0.8L and the pump jet thrust is 15N, the glider’s resultant velocity and its horizontal velocity are double. When the pump thrust increases to 40N, the glider’s resultant velocity and its horizontal velocity are triple. It has also been confirmed that there is a best neutral buoyant pitch angle that can make the glider’s horizontal velocity reach the maximum in a different amount of volume change.
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Evans, K., and T. Engelder. "Some problems in estimating horizontal stress magnitudes in “thrust” regimes." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 26, no. 6 (December 1989): 647–60. http://dx.doi.org/10.1016/0148-9062(89)91445-9.

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Dissertations / Theses on the topic "Horizontal thrust"

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Pessoa, Josà Rafael DiÃgenes. "Development of a triaxial cell for estimating the horizontal in stress conditions edomÃtricas." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15990.

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This thesis presents the development of a triaxial cell and a proposal for methodology for estimating horizontal tension edometric condition by conducting laboratory tests on samples unsaturated compacted soil in OMC. The development of triaxial cell permits the use of voltages or controlled deformation. Moreover, the machine allows independent application increments of axial and radial stresses, thereby facilitating implementation assay in any way triaxial stresses. The proposed methodology simplifies estimate lateral tension through comparison of axial stress-strain curves of the test edomÃtrico conventional triaxial and consolidation tests under different paths tensions with the constant relationship between the axial and radial increments. In this case, the value of K0 would be corresponding to the constant trajectory in which the triaxial test curve edomÃtrico overlaps the curve of the test in terms of stress and axial deformations. They were tests performed with different soil types and the results were- roughly consistent with estimates from correlations empirical, thus allowing validate the proposal presented in this research. also It was studied the change of horizontal stress during the collapse flood conditions in edomÃtricas. In these tests it was found that during the breakdown voltage can horizontal remain virtually constant or even decreasing.
Esta dissertaÃÃo apresenta o desenvolvimento de uma cÃlula triaxial e uma proposta de metodologia para estimativa de tensÃo horizontal em condiÃÃo edomÃtrica, atravÃs da realizaÃÃo de ensaios de laboratÃrio em amostras nÃo saturadas de solo compactadas na umidade Ãtima. O desenvolvimento da cÃlula triaxial possibilita a aplicaÃÃo de tensÃes ou deformaÃÃes controladas. AlÃm disso, o equipamento permite a aplicaÃÃo independente de incrementos de tensÃes axiais e radiais, facilitando dessa forma a execuÃÃo de ensaio triaxial sob qualquer caminho de tensÃes. A metodologia proposta simplifica a estimativa da tensÃo lateral atravÃs da comparaÃÃo das curvas tensÃo-deformaÃÃo axial entre o ensaio edomÃtrico convencional e ensaios de adensamento triaxiais sob diferentes caminhos de tensÃes com a relaÃÃo constante entre os incrementos axial e radial. Nesse caso, o valor de K0 seria o correspondente à trajetÃria constante na qual a curva do ensaio triaxial se sobrepÃe a curva do ensaio edomÃtrico em termos de tensÃes e deformaÃÃes axiais. Foram realizados ensaios com diferentes tipos de solo e os resultados mostraram-se aproximadamente concordantes com as estimativas realizadas a partir de correlaÃÃes empÃricas, permitindo dessa forma validar a proposta apresentada nessa pesquisa. TambÃm foi estudada a variaÃÃo da tensÃo horizontal durante o colapso por inundaÃÃo em condiÃÃes edomÃtricas. Nesses ensaios verificou-se que, durante o colapso, a tensÃo horizontal pode permanecer praticamente constante ou atà mesmo diminuir.
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Brewster, Mary Elizabeth. "Asymptotic Analysis of Thin Plates Under Normal Load and Horizontal Edge Thrust." Thesis, 1987. https://thesis.library.caltech.edu/7539/1/Brewster%20%201987.pdf.

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We consider the radially symmetric nonlinear von Kármán plate equations for circular or annular plates in the limit of small thickness. The loads on the plate consist of a radially symmetric pressure load and a uniform edge load. The dependence of the steady states on the edge load and thickness is studied using asymptotics as well as numerical calculations. The von Kármán plate equations are a singular perturbation of the Fӧppl membrane equation in the asymptotic limit of small thickness. We study the role of compressive membrane solutions in the small thickness asymptotic behavior of the plate solutions.

We give evidence for the existence of a singular compressive solution for the circular membrane and show by a singular perturbation expansion that the nonsingular compressive solutions approach this singular solution as the radial stress at the center of the plate vanishes. In this limit, an infinite number of folds occur with respect to the edge load. Similar behavior is observed for the annular membrane with zero edge load at the inner radius in the limit as the circumferential stress vanishes.

We develop multiscale expansions, which are asymptotic to members of this family for plates with edges that are elastically supported against rotation. At some thicknesses this approximation breaks down and a boundary layer appears at the center of the plate. In the limit of small normal load, the points of breakdown approach the bifurcation points corresponding to buckling of the nondeflected state. A uniform asymptotic expansion for small thickness combining the boundary layer with a multiscale approximation of the outer solution is developed for this case. These approximations complement the well known boundary layer expansions based on tensile membrane solutions in describing the bending and stretching of thin plates. The approximation becomes inconsistent as the clamped state is approached by increasing the resistance against rotation at the edge. We prove that such an expansion for the clamped circular plate cannot exist unless the pressure load is self-equilibrating.

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Lee, Chia-Sung, and 李家崧. "Two-Dimensional Thrust-Vectoring Nozzle Design and Dynamic Model Development for a Micro Turbojet Engine and Its Stability Analysis and Verification of a Horizontal Pendulum." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/72632217690701501669.

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碩士
中華大學
機械與航太工程研究所
92
A two-dimensional thrust-vectoring nozzle is designed for a P-80 micro turbojet engine. The dynamic model of the side force of this thrust-vectoring engine is validated through the equilibrium of a horizontal pendulum. First, a test stand is developed to measure the axial and the lateral response of the thrust-vectoring nozzle. The performance of the nozzle is used to determine the length of the side wall. The 60mm length of the side wall gives the best steady-state response overall. The turning angle of the side wall is limited to 20 degree in order to have a reasonable exhaust temperature as well as a linear output of the side force. The maximum drop in the axial force is only 6﹪at the maximum turning angle. Then, the dynamic response of this thrust-vectoring engine is examined through a series of different frequency operation. The response of this engine by controlling the fuel flow rate can be modeled as a first order system. The time delay is 0.45 sec and the system bandwidth is 0.175Hz. The response of this engine by turning the angle of the nozzle resembles a first order system except a slight overshoot for frequency between 1.6Hz to 3.18Hz. The time delay is 0.08 sec and the system bandwidth is 2.88Hz by controlling the turning angle. The step response and the ramp response of the axial force and the side force show a good agreement between the models and the test data. The best feedback parameters are 0.05 for the proportional controller, 0.1 for the integral controller, and 1 for the derivative controller for the horizontal pendulum system. The average marginal amplitude is , the steady-state error is , and the oscillating period is 0.95 sec for the turning angle feedback. Finally, several designed parameters are investigated to reduce the marginal amplitude of the horizontal pendulum. Increasing the polar inertia reduces the effect of disturbance. Increasing the damping ratio of the bearing decreases the interference due to viscous effect but the oscillation frequency will increase. For a constant feedback turning angle of the nozzle, there is an optimal distance between the position of the side force and the pendulum support. The correction of the moment is undershoot or overshoot once deviating from the optimum length. Without the disturbance the smaller the feedback turning angle of the nozzle, the smaller the marginal amplitude is. However, the test data shows a minimal turning angle should be used to balance the horizontal pendulum. The interference from the engine itself will make the system unstable for a nozzle correction of less than turning angle. For a nozzle correction of more than turning angle, the larger the marginal amplitude is.
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Books on the topic "Horizontal thrust"

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Interference effects of thrust reversing on horizontal tail effectiveness of a twin-engine fighter aircraft at Mach numbers from 0.15 to 0.9. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Book chapters on the topic "Horizontal thrust"

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Nay, Shaun M., and Philip D. Clausen. "Measuring the Torque and Thrust Loading on the Blades of a Small Horizontal Axis Wind Turbine Operating in Highly Turbulent Flow Regimes." In Wind Energy Exploitation in Urban Environment, 151–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13531-7_9.

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"horizontal thrust resulting from arching." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 689. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_81426.

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Oreskes, Naomi. "The Collapse of Thermal Contraction." In The Rejection of Continental Drift. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195117325.003.0008.

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In 1901, Karl Zittel, president of the Bavarian Royal Academy of Sciences, declared that “Suess has secured almost general recognition for the contraction theory” of mountain-building. This was wishful thinking. Suess’s Das Antlitz der Erde was indeed an influential work, but by the time Suess finished the final volume (1904), the thermal contraction theory was under serious attack. Problems were evident from three different but equally important quarters. The most obvious problem for contraction theory arose from field studies of mountains themselves. As early as the 1840s, it had been recognized that the Swiss Alps contained large slabs of rock that appeared to have been transported laterally over enormous distances. These slabs consisted of nearly flat-lying rocks that might be construed as undisplaced, except that they lay on top of younger rocks. In the late nineteenth century, several prominent geologists, most notably Albert Heim (1849 –1937), undertook extensive field work in the Alps to attempt to resolve their structure. Heim’s detailed field work, beautiful maps, and elegant prose convinced geological colleagues that the Alpine strata had been displaced horizontally over enormous distances. In some cases, the rocks had been accordioned so tightly that layers that previously extended horizontally for hundreds of kilometers were now reduced to distances of a few kilometers. But in even more startling cases, the rocks were scarcely folded at all, as if huge slabs of rocks had been simply lifted up from one area of the crust and laid down in another. Heim interpreted the slabs of displaced rock in his own Glarus district as a huge double fold with missing lower limbs, but in 1884 the French geologist Marcel Bertrand (1847–1907) argued that these displacements were not folds but faults. Large segments of the Alps were the result of huge faults that had thrust strata from south to north, over and on top of younger rocks. August Rothpletz (1853–1918), an Austrian geologist, realized that the Alpine thrust faults were similar to those that had been earlier described by the Rogers brothers in the Appalachians. By the late 1880s, thrust faults had been mapped in detail in North America, Scotland, and Scandinavia.
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Inbaraj, Sophia, Vamshi Krishna Sriram, Prasad Thomas, Abhishek Verma, and Pallab Chaudhuri. "Antibiotic Resistance in the Veterinary Perspective." In Global Applications of One Health Practice and Care, 142–57. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-6304-4.ch006.

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Antibiotic resistance is an emerging threat to achieving one health all over the globe. The phenomenon leads to the emergence of drug-resistant microbes previously susceptible to an antibiotic. Drug-resistant microbes are the major reasons for medical complications like patient mortality and treatment failure. Unregulated use of antibiotics in animal husbandry is one of the major reasons for the emergence of antibiotic resistance. The resistance enters the human population mainly through the food chain. The genetic markers associated with drug resistance spread among different bacterial species by horizontal gene transfer mechanisms. Therefore, regulation of antibiotics use in animal husbandry and proper safety measures at farm level are necessary to check drug-resistant microbes entering the food chain. This chapter discusses the antibiotics, antibiotic resistance, genetic mechanisms involved, the spread of resistance, and also the available strategies to combat antimicrobial drug resistance.
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Kumar, V. Hemanth, and K. Sentamilselvan. "Challenges and Opportunities in Urban Farming." In Urban Agriculture and Food Systems, 580–88. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8063-8.ch029.

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In the rapid growing urbanization, especially in the metros, it is not sure that it really leads to development of the society nor becoming a threat to it. The urbanization leads to shrinkage of the fertile and farming lands to concrete monuments for human to work in an artificial atmosphere. The vertical urbanization is very common in the cities than horizontal, due to shortage of lands. This leads to the vital resources of food and vegetables in scarce for the drastically overflowing population, ends up in fast foods and packed foods culture, that is far from organic foods, which is a clear path towards obesity, diabetes and high rate of heart disease among the youth. This study is an initiative to bring out the feasibility of urban farming that struggles to strengthen its roots in our nation. The research focuses on the challenges and opportunities of urban farming in the society. The outcomes shall bring out societal views on urban farming and the suggest ways to overcome the hindrances and facilitate the people towards utilizing the opportunities of urban farming with its benefits and ‘Let the City Grow Green', which is the way to enrich health for their present and future generations.
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Kumar, V. Hemanth, and K. Sentamilselvan. "Challenges and Opportunities in Urban Farming." In Start-Up Enterprises and Contemporary Innovation Strategies in the Global Marketplace, 28–36. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4831-7.ch003.

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In the rapid growing urbanization, especially in the metros, it is not sure that it really leads to development of the society nor becoming a threat to it. The urbanization leads to shrinkage of the fertile and farming lands to concrete monuments for human to work in an artificial atmosphere. The vertical urbanization is very common in the cities than horizontal, due to shortage of lands. This leads to the vital resources of food and vegetables in scarce for the drastically overflowing population, ends up in fast foods and packed foods culture, that is far from organic foods, which is a clear path towards obesity, diabetes and high rate of heart disease among the youth. This study is an initiative to bring out the feasibility of urban farming that struggles to strengthen its roots in our nation. The research focuses on the challenges and opportunities of urban farming in the society. The outcomes shall bring out societal views on urban farming and the suggest ways to overcome the hindrances and facilitate the people towards utilizing the opportunities of urban farming with its benefits and ‘Let the City Grow Green', which is the way to enrich health for their present and future generations.
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Searle, Mike. "The Day the Earth Shook: The Sumatra–Andaman Earthquake 2004." In Colliding Continents. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199653003.003.0018.

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At 00.58 GMT (7.58 local time) on Sunday, 26 December 2004 a massive earthquake occurred off the north-west coast of Sumatra. The earthquake measured between magnitude 9.0 and 9.3 on the Richter scale with its epicentre at 3.32oN, 95.85oE, and occurred at a depth of approximately 30 kilometres. It was the second largest earthquake recorded since instrumental records began and was the deadliest natural disaster in recorded history. The earthquake and the resulting tsunami are estimated to have killed at least 228,000 people across fifteen countries bordering the Indian Ocean. The worst affected countries were Indonesia, Sri Lanka, India, Thailand, Burma, the Maldives, and Somalia. The earthquake occurred on the subduction zone interface between the down-going Indian Ocean plate and the overriding Burma–Andaman–Sumatra plate. It ruptured approximately 1600 kilometres’ length of the plate boundary from Sumatra all the way north to the Burmese coast, travelling at 2–3 kilometres per second. Aftershocks continued unrelentingly for over four months after the earthquake, several reaching magnitude 7.5 as far north as the northern Andaman Islands. The seismic waves indicated a thrust fault earthquake that tilted the surface up to the south-west and down to the north-east. The ground surface was elevated as much as 11 metres at the epicentre, with the tilted surface sinking up to one metre further to the north-east, offshore Sumatra. During the rupture, the Burma plate slipped as much as 15 metres horizontally as the Indian Ocean plate slipped beneath. The force of the quake perceptibly shifted the Earth’s axis, raised sea level globally and speeded Earth’s rotation. It has been suggested that the earthquake shortened the length of the day by 2.68 microseconds, because of the decrease in oblateness of the Earth. The earthquake caused the Earth to wobble on its axis by up to 2.5 cm in the direction of 145o east longitude. The natural ‘Chandler wobble’, a small motion in the Earth’s axis of rotation (the motion that occurs when the spinning object is not a perfect sphere) can be up to 9 metres over 433 days, so this eventually offsets the comparatively minor wobble produced by the earthquake.
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Tiber, Simon. "Upper and Lower Respiratory Tract Infections." In Tutorial Topics in Infection for the Combined Infection Training Programme. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198801740.003.0040.

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Pharyngitis is common with incidence peaking from autumn to spring. Respiratory viruses are most commonly implicated, and are generally self-limiting conditions not requiring diagnostic workup or treatment. Bacterial pharyngitis is less common, is spread by droplets or direct transmission, and Streptococcus pyogenes (Group A strep, or GAS) is the most frequent cause. Haemophilus influenzae, Mycoplasma pneumoniae, and Neisseria gonorrhoeae are less frequent causes. Rapid antigen detection tests make the point-of-care assessment of GAS pharyngitis possible, although a negative test does not exclude infection. No method can distinguish oropharyngeal colonization from actual infection, but culture can obtain antibiotic susceptibility testing. Suspicion of infection with Neisseria gonorrhoeae, Bordetella pertussis, Haemophilus influenzae, Mycoplasma pneumoniae, Chlamydophila pneumoniae, or Corynebacterium diptheriae should be communicated to the laboratory so that the appropriate culture media is utilized. The Centor criteria provide a clinical predictive score that can give the likelihood a sore throat is due to a bacterial infection with the following: the presence of tonsillar exudate, tender anterior cervical adenopathy, fever over 38°C, and absence of cough. If three or four of these criteria are met, the positive predictive value is 40% to 60%. The absence of three or four of the Centor criteria has a relatively high negative predictive value of 80%, and may be use to evaluate whether antibiotics can be withheld or deferred. Oral penicillin or macrolide are used to treat streptococcal pharyngitis. Treatment may reduce severity, duration, transmission, and risk of post-infectious sequelae like rheumatic heart disease and post-streptococcal glomerulonephritis. Other complications include scarlet fever, streptococcal toxic shock syndrome, and quinsy. Otitis media, is frequent in the young children, possibly due to a short and horizontal Eustachian tube. Purulent material buils up leading to a bulging, red tympanic membrane which may rupture and discharge. Intense local pain and fevers may occur. Streptococcus pneumoniae, Moraxella catarrhalis, and Haemophilus influenzae are frequently implicated. Frequently there are no sequelae, although complications include hearing impairment, and less common are mastoiditis, bacteraemia, and meningitis. Diagnosis is clinical based on presentation and otoscopic examination. Microbiological diagnosis is possible through culture of exuate on swab or following tympanocentesis.
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"up to 5-10 cm, without leaves. Corolla pale blue, 6-7 mm in diam., limb flat, with ovate-orbicular lobes, tube short, as long as calyx; arches on throat white or yellow, broad, papillate, forming crown, sealing tube inlet; after anthesis, style not projecting from calyx. Calyx campanulate, 2-2.5 mm long in flower, 3.5-5 mm long in fruits and pubescent with appressed bristles, incised for 1/3 into broad deltoid teeth. Fruit stems long, strong, 0.5-0.8 cm long, horizontally declinate in fruits, pubescent with appressed tiny bristles. Erema 1.5-1.7 mm long, brown, lustrous, ovate, with narrow wing; areola broad, trapezoidal, wit h short groove along margin. On Putoran plateau (Talnakh settlement) and in East. Sayan (Tunkinsk mountain range), 2 n = 22. Plate XVII (1). In swamps, humid meadows, along banks of water reservoirs in forest and forest-steppe regions. West. Sib.: TYU—Yam, Khm, Tb, KU, OM, TO, NO, KE, AL—Ba, Go. Cen. Sib,: KR—Ta, Pu, Tn, Kha, Ve, TU. East. Sib.: IR—An, Pr, BU—Se, Yuzh (Selenginsk region: Bichura village), YAK—Vi, Al.—Europe, Caucasus, Mid . Asia, Asia Minor, Nor. America. Described from Europe. Map 82." In Flora of Siberia, Vol. 11, 144–57. CRC Press, 2006. http://dx.doi.org/10.1201/9781482279696-26.

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Conference papers on the topic "Horizontal thrust"

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CUNNINGHAM, M., D. FREEMAN, JR., A. WILHITE, and R. POWELL. "Thrust vectoring for single-stage-to-orbit, horizontal takeoff, horizontal landing, space vehicles." In 22nd Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-1414.

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Hitachi, Yoshitsugu, and Hugh Liu. "Robust Thrust-Only Control of Damaged Aircraft with Horizontal Tail Loss." In AIAA Guidance, Navigation, and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-7856.

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El Sheshtawy, Hassan, Ould el Moctar, Thomas E. Schellin, and Satish Natarajan. "Numerical Investigation of an Optimised Horizontal Axis Tidal Stream Turbine." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95722.

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Abstract A tidal stream turbine was designed using one of the optimised hydrofoils, whose lift-to-drag ratio at an angle of attack of 5.2 degrees was 4.5% higher than that of the reference hydrofoil. The incompressible Reynolds-averaged Navier Stokes equations in steady state were solved using k-ω (SST) turbulence model for the reference and optimised tidal stream turbines. The discretisation errors and the effect of different y+ values on the solution were analysed. Thrust and power coefficients of the modelled reference turbine were validated against experimental measurements. Output power and thrust of the reference and the optimised tidal turbines were compared. For a tip speed ratio of 3.0, the output power of the optimised tidal turbine was 8.27% higher than that of the reference turbine of the same thrust.
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Marmo, Francesco, Daniele Masi, Salvatore Sessa, Ferdinando Toraldo, and Luciano Rosati. "THRUST NETWORK ANALYSIS OF MASONRY VAULTS SUBJECT TO VERTICAL AND HORIZONTAL LOADS." In 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2017. http://dx.doi.org/10.7712/120117.5562.17018.

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"Contribution of Lateral Earth Pressure Resistance to Restrain Horizontal Thrust in Buried Pipelines." In Pipelines Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41187(420)34.

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Matveev, Konstantin I., and Miles P. Wheeler. "Simulations of Tubular UAV With Vectored Thrust in Near-Hovering Regimes in the Presence of Side Winds." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4678.

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Abstract An innovative unmanned aerial vehicle with a tubular body and a vectored thruster is considered in this study. In order to optimize the vehicle design and develop effective means for its control, aerodynamic characteristics of this vehicle need to be known. Computational fluid dynamics studies employing STAR-CCM+ software have been carried out for this UAV in near-hovering regimes. Aerodynamic simulations employed the SST k–ω turbulence model, γ transition model, and a virtual actuator disk model. After conducting a validation study with a cylinder in axial flow, modeling of the UAV setup was completed for a range of propulsor orientations and cross winds. The aerodynamic phenomena are found to become more complex with increasing the propulsor angle with respect to the main body axis and in stronger cross winds due to interactions between the incident flow, the propulsor jet, and the body surface. At the propulsor deflection angle of 15°, the horizontal aerodynamic force on the body was augmented by 0.02–0.07 of the propulsor thrust magnitude in various wind conditions, whereas the axial downward force increased by 0.01–0.03 of the thrust. In cross winds with the relative velocity magnitude of 0.65, the horizontal aerodynamic force on the body increased by about 0.25 of the propulsor thrust magnitude, while the axial downward force increased by about 0.05 of the thrust.
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Maxwell, Shawn C., Ulrich Zimmer, Ronald W. Gusek, and David James Quirk. "Evidence of Horizontal Hydraulic Fracture at Depth Due to Stress Rotations Across a Thrust Fault." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2007. http://dx.doi.org/10.2118/110696-ms.

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Xing, Yihan, Kristian Fotland, and Muk Chen Ong. "OpenModelica Modelling of the Thruster in a Compact Subsea Work-Class Remotely Operated Vehicle." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96839.

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Abstract Thrusters are vital for the functionalities of remotely operated vehicles (ROVs). The development of thruster design is a trade-off between cost, thrust force, physical weight and size. A six degree of freedom model is created in OpenModelica to investigate the vibrations and bearing responses in thruster systems. The model consists of a marine propeller, a shaft, and two bearings. The propeller used is based on the Wageningen B-screw propeller series. The hydrodynamic added mass and damping forces are calculated from empirical equations based on open water tests and are functions of the propeller geometry, rotational speed and fluid density. Meanwhile, the mean thrust and torque are obtained from open water test data of the relevant propeller and are used to calculate the dynamic forces and moments from the marine propeller. Displacements in the axial, horizontal, and vertical directions are calculated and used to investigate vibration amplitudes and bearing life. Initial steady-state simulations show that the bearing life of the bearings in the thruster is found to be highly dependent on the axial load acting on the bearing, i.e., the thrust force. Moreover, if the propeller is not balanced then high centrifugal forces can occur and result in severe forces in the radial direction which can be of concern regarding the bearing life.
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Brown, D. T., and L. Ekstrom. "Vessel Thruster-Thruster Interactions During Azimuthing Operations." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67500.

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Flow interaction between thrusters is important, as many offshore vessels are equipped with rotating (azimuthing) thrusters for ease of manoeuvring and dynamic positioning. Accurate prediction of available thrust to resist horizontal environmental forces is essential allowing the realistic station-keeping capability of these vessels to be established. Additionally such thrusters are in many cases used, possibly in conjunction with tunnel thrusters and main propeller to provide propulsive power in transit. This paper presents the influence of two thrusters in close proximity, azimuthing so that flow into one thruster is influenced by the flow through the second thruster. The work extends that previously presented in OMAE 2002, based on a comprehensive experimental study to establish the influence on thruster performance of variations in current inflow velocity, thruster power, and thruster position relative to the hull.
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Liu, Cheng, and Changhong Hu. "Numerical Prediction of the Hydrodynamic Performance of a Horizontal Tidal Turbines." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41776.

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Tidal current energy is one of the most promising renewable energy resources. The prediction of the hydrodynamic loads and power efficiency are the critical issues for verifying the new designs. Besides, Optimization of turbine arrangement is important for a tidal turbine farm. The hydrodynamic behavior of a turbine operating in the wake of an upstream turbine needs to clarify. In this paper we present a CFD approach in which the CFD library of OpenFOAM is utilized for prediction of the performance of a three bladed horizontal axis tidal turbine (HATT) in a test tunnel environment. The Reynolds Average Navier Stokes (RANS) equation with Shear Stress Transport (SST) turbulence model is applied. The steady-state solver is tested for present numerical simulation. The Multi Reference Framework (MRF) method is adopted for dealing with grid relative rotation. Turbulence models effects and the mesh generation are well described. The resultant power and thrust coefficients of these simulations are compared with experimental results at various tip speed ratios (TSRs).
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Reports on the topic "Horizontal thrust"

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Shahsavarifard, Mohammad, and Eric Bibeau. Experimental power and thrust coefficients of a shrouded horizontal axis hydrokinetic turbine. University of Manitoba, March 2014. http://dx.doi.org/10.5203/ds_sha_1.

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Shahsavarifard, Mohammad, and Eric Louis Bibeau. Experimental power and thrust coefficients of a shrouded horizontal axis hydrokinetic turbine. University of Manitoba Libraries, November 2014. http://dx.doi.org/10.5203/ds_sho_1.

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Shahsavarifard, Mohammad, and Eric Louis Bibeau. Experimental power and thrust coefficients of a shrouded horizontal axis hydrokinetic turbine in yaw operation. University of Manitoba Libraries, November 2014. http://dx.doi.org/10.5203/ds_sha_2.

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Demchyna, Bohdan, and Yaroslav Shydlovskyi. Recommendations for Designing Wooden Arches on Metal-toothed Plates. Intellectual Archive, March 2021. http://dx.doi.org/10.32370/ia_2021_03_18.

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This paper presents the findings of the pilot studies and recommendations for designing of two-hinged wooden arches. The prototype models of wooden arches with the span of 6mand the rise of 1m were designed. The models had a rectangular cross-section of 180x40mm and a T-section of 180x40mm with a plywood plate with the thickness of 6 mm and the width of 500mm. The main objective of the T-section was to ensure the stability of the arch. Each arch was composed of six segments –boards joined by clamping plates. The bowstring truss including two inclined tie bars enables carrying asymmetric loads and provides in-plane stability of the arch. A methodology for laboratory testing of the prototype models of wooden arches subjected to different types of loads was developed. Two prototypes of wooden arches were tested with rectangular cross-sections and two T-section ones subjected to the loading across the span, and two prototypes subjected to the half-span loading. In total, eight arches were tested. Deflections of arches, cross-section deformations and arch thrust force were recorded. The arches were tested until failure. The results of testing revealed insufficient stability of the arches with rectangular cross-section in the horizontal plane. For the arches with T-section the whole arch rib was damaged, the in-plane stability was ensured by the T-section. The collapsing force of the T-section arch was about 1.3 times greater than the collapsing force of the rectangular section arches.
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