Relevant bibliographies by topics / Buffet loads

Academic literature on the topic 'Buffet loads'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Buffet loads"

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Breitsamter, Christian, and Arne Schmid. "Airbrake-Induced Fin-Buffet Loads On Fighter Aircraft." Journal of Aircraft 45, no. 5 (September 2008): 1619–30. http://dx.doi.org/10.2514/1.33969.

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Chen, Y., V. Wickramasinghe, and D. Zimcik. "Active Control of a hybrid actuation system for aircraft vertical fin buffet load alleviation." Aeronautical Journal 110, no. 1107 (May 2006): 315–26. http://dx.doi.org/10.1017/s000192400001318x.

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AbstractTwin-tail fighter aircraft may experience intense buffet loads when flying at high angles of attack. One such aircraft is the F/A-18 where the broadband buffet loads primarily excite the first bending and torsional modes of the vertical fin, resulting in significant vibration and dynamic stresses on the vertical tail structure. This buffet phenomenon reduces the fatigue life of the aircraft structure while decreasing mission availability.An international technical co-operation program was initiated to develop a novel hybrid actuation system to actively alleviate the buffet response of a full-scale F/A-18 vertical fin. A hydraulic rudder actuator was used to control the bending mode of the vertical fin using rudder inertia forces. Multiple macro fiber composite actuators were distributed optimally to provide maximum induced strain control authority for the torsional mode. In order to develop an effective control law, a system identification approach was conducted to obtain a state-space model of the vertical fin using open-loop test data. An LQG control law was selected to minimise the dynamic response of the vertical fin at critical locations. The effectiveness of the control law was verified through extensive simulation prior to closed-loop experiments. The LQG control law demonstrated high robustness in all excitation load conditions; both bending and torsional vibration modes of the vertical tail were suppressed effectively and simultaneously. The dynamic stress and acceleration response at critical locations were also reduced significantly. A closed-loop experiment was conducted on a full-scale F/A-18 empennage using the IFOSTP test rig, and the experimental results verified the effectiveness of the control law development methodology used for the full-scale hybrid buffet load system for the F/A-18 aircraft. In addition, the ground vibration test demonstrated that the hybrid actuation system is a feasible solution to alleviate the vertical tail buffet loads in high performance fighter aircraft.
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Dang, Huixue, Junhai Zhao, Zhichun Yang, and Huibo Dang. "Postponing the Onset and Alleviating the Load of Transonic Buffet by Using Steady and Periodic Tangential Slot Blowing." Applied Sciences 9, no. 19 (October 2, 2019): 4132. http://dx.doi.org/10.3390/app9194132.

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Transonic buffet not only influences the structural integrity, handling quality and ride comfort, but also limits the flight envelope of transporters and airliners. To delay buffet onset and alleviate the buffet load, the effects of both steady and periodic tangential slot blowing are investigated. The results show that steady tangential blowing on the airfoil upper surface can postpone the buffet onset margin and evidently increase the lift coefficient at incidence angles near and above the buffet onset case of the clean airfoil. Under buffeting conditions of the clean airfoil, unsteady aerodynamic loads can be greatly suppressed by both steady and periodic blowing. The control effort is depicted as reduced wedge effect and weakened dynamic effect. The buffet mechanism includes (a) the feedback loop between the Kutta wave and the separation bubble under the shock foot, and (b) the interaction between the shear layer shed by the shockwave and Kutta waves. Under blowing conditions, the upstream creeping Kutta waves are prevented, and the intensity of the shear layer shed by the shockwave into separated flows is evidently reduced. Parametric studies show that the control effect is reduced as the blowing slot moves downstream, and steady blowing at 41% x/c is the most favorable control case.
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Ragab, Mohamed M. "Buffet loads prediction for a launch vehicle and comparison to flight data." Journal of Spacecraft and Rockets 29, no. 6 (November 1992): 849–55. http://dx.doi.org/10.2514/3.25541.

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Lee, B. H. K., and S. Dunlavy. "Statistical prediction of maximum buffet loads on the F/A-18 vertical fin." Journal of Aircraft 29, no. 4 (July 1992): 734–36. http://dx.doi.org/10.2514/3.46236.

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6

Statnikov, Vladimir, Matthias Meinke, and Wolfgang Schröder. "Reduced-order analysis of buffet flow of space launchers." Journal of Fluid Mechanics 815 (February 14, 2017): 1–25. http://dx.doi.org/10.1017/jfm.2017.46.

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A reduced-order analysis based on optimized dynamic mode decomposition (DMD) is performed on the turbulent wake of a generic axisymmetric space launcher configuration computed via a zonal large-eddy simulation at the free stream Mach number $Ma_{\infty }=0.8$ and the Reynolds number based on the main body diameter $Re_{D}=6\times 10^{5}$ to investigate the buffet phenomenon. The transonic wake is characterized by an unsteady recirculation region occurring around the nozzle due to the separation of the turbulent boundary layer at the main body shoulder and subsequent dynamic interaction of the unstable free-shear layer with the nozzle surface. This results in strongly periodic and antisymmetric wall pressure fluctuations, for which three distinct frequency ranges are identified using conventional spectral analysis, i.e. $Sr_{D}\approx 0.1$, $Sr_{D}\approx 0.2$ and $Sr_{D}\approx 0.35$. For the spatially integrated side (buffet) loads on the nozzle, the second range is found to be energetically most dominant. To clarify the origin of the detected wake dynamics, the underlying spatio-temporal coherent modes are extracted using DMD. Subsequent analysis of the reduced-order modelled flow field based on the identified DMD modes reveals that at $Sr_{D}\approx 0.1$ a longitudinal cross-pumping motion of the separation bubble takes place, caused by a harmonic antisymmetric oscillation of the main recirculation vortex in the streamwise direction. At $Sr_{D}\approx 0.2$, a cross-flapping motion of the shear layer is determined, triggered by antisymmetric vortex shedding which is in phase with the cross-pumping motion such that it occurs at twice the frequency value. The last range of $Sr_{D}\approx 0.35$ is attributed to a swinging motion of the shear layer caused by a higher harmonic of the vortex shedding mode. Conclusively, the controversial aspect of the true three-dimensional shape of the antisymmetric mode at $Sr_{D}\approx 0.2$ that dominates the buffet phenomenon is scrutinized. Inclined elongated closed-loop vortices are identified that are shed in alternating sequence from azimuthally opposite positions in a longitudinal plane of symmetry that changes its momentary orientation irregularly, maintaining an axisymmetric time-averaged field and spatially isotropic buffet loads.
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Pilichiewicz, Amelia N., Penny Papadopoulos, Ixchel M. Brennan, Tanya J. Little, James H. Meyer, Judith M. Wishart, Michael Horowitz, and Christine Feinle-Bisset. "Load-dependent effects of duodenal lipid on antropyloroduodenal motility, plasma CCK and PYY, and energy intake in healthy men." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 293, no. 6 (December 2007): R2170—R2178. http://dx.doi.org/10.1152/ajpregu.00511.2007.

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Both load and duration of small intestinal lipid infusion affect antropyloroduodenal motility and CCK and peptide YY (PYY) release at loads comparable to and higher than the normal gastric emptying rate. We determined 1) the effects of intraduodenal lipid loads well below the mean rate of gastric emptying on, and 2) the relationships between antropyloroduodenal motility, CCK, PYY, appetite, and energy intake. Sixteen healthy males were studied on four occasions in double-blind, randomized fashion. Antropyloroduodenal motility, plasma CCK and PYY, and appetite perceptions were measured during 50-min IL (Intralipid) infusions at: 0.25 (IL0.25), 1.5 (IL1.5), and 4 (IL4) kcal/min or saline (control), after which energy intake at a buffet meal was quantified. IL0.25 stimulated isolated pyloric pressure waves (PWs) and CCK release, albeit transiently, and suppressed antral PWs, PW sequences, and hunger ( P < 0.05) but had no effect on basal pyloric pressure or PYY when compared with control. Loads ≥ 1.5 kcal/min were required for the stimulation of basal pyloric pressures and PYY and suppression of duodenal PWs ( P < 0.05). All of these effects were related to the lipid load ( R > 0.5 or < −0.5, P < 0.05). Only IL4 reduced energy intake (in kcal: control, 1,289 ± 62; IL0.25, 1,282 ± 44; IL1.5, 1,235 ± 71; and IL4, 1,139 ± 65 compared with control and IL0.25, P < 0.05). In conclusion, in healthy males the effects of intraduodenal lipid on antropyloroduodenal motility, plasma CCK and PYY, appetite, and energy intake are load dependent, and the threshold loads required to elicit responses vary for these parameters.
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Ball, Dale L., Philip C. Gross, and Robert J. Burt. "F-35 Full Scale Durability Modeling and Test." Advanced Materials Research 891-892 (March 2014): 693–701. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.693.

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The F-35 Joint Strike Fighter program includes three aircraft variants, one of which has been designed and built according to US Air Force requirements, and the other two of which have been designed and built according to US Navy requirements. For all three variants, a system design and development (SDD) configuration aircraft is being subjected to a full-scale durability (FSD) test. In each case, the complete airframe is being subjected to two lifetimes of severe design spectrum loading, with maneuver, catapults/arrestments (carrier variant only) and buffet loads applied as separate, alternating 1000 flight hour blocks during the major test sequence. For the airframe tests, the buffet loads are applied quasi-statically; for the separate vertical tail component tests, they are applied dynamically. In addition, tests of doors and attachments (local tests) are conducted when the full airframe test is down for inspections (as required, for example, between the first and second lifetimes). In this paper, we describe the manner in which the airframe tests were designed, including fatigue spectrum development and test adequacy analyses. In addition, we provide a summary of the test findings to date, along with a description of the analytical simulation for a typical finding. The paper includes an analysis vs test correlation summary that provides an indication of the validity of the fatigue crack initiation (FCI) and fatigue crack growth (FCG) analysis methods used to design the aircraft.
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Pilichiewicz, Amelia N., Reawika Chaikomin, Ixchel M. Brennan, Judith M. Wishart, Christopher K. Rayner, Karen L. Jones, Andre J. P. M. Smout, Michael Horowitz, and Christine Feinle-Bisset. "Load-dependent effects of duodenal glucose on glycemia, gastrointestinal hormones, antropyloroduodenal motility, and energy intake in healthy men." American Journal of Physiology-Endocrinology and Metabolism 293, no. 3 (September 2007): E743—E753. http://dx.doi.org/10.1152/ajpendo.00159.2007.

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Gastric emptying is a major determinant of glycemia, gastrointestinal hormone release, and appetite. We determined the effects of different intraduodenal glucose loads on glycemia, insulinemia, glucagon-like peptide-1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP) and cholecystokinin (CCK), antropyloroduodenal motility, and energy intake in healthy subjects. Blood glucose, plasma hormone, and antropyloroduodenal motor responses to 120-min intraduodenal infusions of glucose at 1) 1 (“G1”), 2) 2 (“G2”), and 3) 4 (“G4”) kcal/min or of 4) saline (“control”) were measured in 10 healthy males in double-blind, randomized fashion. Immediately after each infusion, energy intake at a buffet meal was quantified. Blood glucose rose in response to all glucose infusions ( P < 0.05 vs. control), with the effect of G4 and G2 being greater than that of G1 ( P < 0.05) but with no difference between G2 and G4. The rises in insulin, GLP-1, GIP, and CCK were related to the glucose load ( r > 0.82, P < 0.05). All glucose infusions suppressed antral ( P < 0.05), but only G4 decreased duodenal, pressure waves ( P < 0.01), resulted in a sustained stimulation of basal pyloric pressure ( P < 0.01), and decreased energy intake ( P < 0.05). In conclusion, variations in duodenal glucose loads have differential effects on blood glucose, plasma insulin, GLP-1, GIP and CCK, antropyloroduodenal motility, and energy intake in healthy subjects. These observations have implications for strategies to minimize postprandial glycemic excursions in type 2 diabetes.
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Dumon, Jéromine, Yannick Bury, Nicolas Gourdain, and Laurent Michel. "Numerical and experimental investigations of buffet on a diamond airfoil designed for space launcher applications." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 9 (June 19, 2019): 4203–18. http://dx.doi.org/10.1108/hff-07-2018-0353.

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Purpose The development of reusable space launchers requires a comprehensive knowledge of transonic flow effects on the launcher structure, such as buffet. Indeed, the mechanical integrity of the launcher can be compromised by shock wave/boundary layer interactions, that induce lateral forces responsible for plunging and pitching moments. Design/methodology/approach This paper aims to report numerical and experimental investigations on the aerodynamic and aeroelastic behavior of a diamond airfoil, designed for microsatellite-dedicated launchers, with a particular interest for the fluid/structure interaction during buffeting. Experimental investigations based on Schlieren visualizations are conducted in a transonic wind tunnel and are then compared with numerical predictions based on unsteady Reynolds averaged Navier–Stokes and large eddy simulation (LES) approaches. The effect of buffeting on the structure is finally studied by solving the equation of the dynamics. Findings Buffeting is both experimentally and numerically revealed. Experiments highlight 3D oscillations of the shock wave in the manner of a wind-flapping flag. LES computations identify a lambda-shaped shock wave foot width oscillations, which noticeably impact aerodynamic loads. At last, the experiments highlight the chaotic behavior of the shock wave as it shifts from an oscillatory periodic to an erratic 3D flapping state. Fluid structure computations show that the aerodynamic response of the airfoil tends to damp the structural vibrations and to mitigate the effect of buffeting. Originality/value While buffeting has been extensively studied for classical supercritical profiles, this study focuses on diamond airfoils. Moreover, a fluid structure computation has been conducted to point out the effect of buffeting.
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Dissertations / Theses on the topic "Buffet loads"

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Carn, Cheril, and cheril Carn@dsto defence gov au. "The inverse determination of aircraft loading using artificial neural network analysis of structural response data with statistical methods." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080109.090600.

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An artificial Neural Network (ANN) system has been developed that can analyse aircraft flight data to provide a reconstruction of the aerodynamic loads experienced by the aircraft during flight, including manoeuvre, buffet and distributed loading. For this research data was taken from the International Follow-On Structural Test Project (IFOSTP) F/A-18 fatigue test conducted by the Royal Australian Air Force and Canadian Forces. This fatigue test involved the simultaneous application of both manouevre and buffet loads using airbag actuators and shakers. The applied loads were representative of the actual loads experienced by an FA/18 during flight tests. Following an evaluation of different ANN types an Ellman network with three linear layers was selected. The Elman back-propagation network was tested with various parameters and structures. The network was trained using the MATLAB 'traingdx' function with is a gradient descent with momentum and adaptive learning rate back-propagation algorithm. The ANN was able to provide a good approximation of the actual manoeuvre or buffet loads at the location where the training loads data were recorded even for input values which differ from the training input values. In further tests the ability to estimate distributed loading at locations not included in the training data was also demonstrated. The ANN was then modified to incorporate various methods for the calculation and prediction of output error and reliability Used in combination and in appropriate circumstances, the addition of these capabilities significantly increase the reliability, accuracy and therefore usefulness of the ANN system's ability to estimate aircraft loading.To demonstrate the ANN system's usefulness as a fatigue monitoring tool it was combined with a formulae for crack growth analysis. Results inficate the ANN system may be a useful fatigue monitoring tool enabling real time monitoring of aircraft critical components using existing strain gauge sensors.
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Gutierrez, Manuel S. M. Massachusetts Institute of Technology. "An energy buffer for constant power loads." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111914.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 111-113).
Constant power loads (CPLs) are a class of loads steadily increasing in use. They are present whenever a load is regulated to maintain constant output power, such as with LED drivers in high quality lighting that is impervious to input fluctuations. Because CPLs exhibit a negative incremental input impedance, they pose stability concerns in DC and AC systems. This thesis presents a power converter for a constant power LED bulb that presents a favorable input impedance to the grid. The use of an energy buffer allows the converter to draw variable power in order to resemble a resistive load, while the output consumes constant power. A switched-mode power supply consisting of a cascaded boost and buck converter accomplishes this by storing energy in the boost stage output capacitor. Experimental results demonstrate that the converter exhibits a resistive input impedance at frequencies over 0.5 Hz while maintaining constant power to the LED load.
by Manuel Gutierrez.
S.M.
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3

Rai, Manpreet Kaur. "Understanding the role of the episodic buffer of working memory in inferential reading comprehension in L1 and L2 readers under varying conditions of cognitive load and domain knowledge." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/18232.

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Doctor of Philosophy
Department of Psychological Sciences
Richard Jackson Harris
In recent years, Baddeley (2010) has added a new component, the episodic buffer, to his Working Memory (WM) model. The episodic buffer binds information from long-term memory (LTM) to the central executive but has been researched very little, especially with respect to its use with a second language. In fact, Juffs and Harrington (2011) stated, “To date there has been no research on the possible role of the episodic buffer in L2 learning and use” (p. 140). One goal of this study was to do just that. Domain knowledge (DK) in baseball (Experiment 1) and English proficiency levels (Experiment 2) were used as proxies for difficulty level to study how inference processing under different conditions of domain knowledge and cognitive load in native (L1) and non-native (L2) English readers contribute to understanding the episodic buffer. In Experiment 1, 67 participants varying in domain knowledge about baseball read stories related to baseball with or without a concurrent cognitive load task of responding to tones while reading; they then answered comprehension questions of varying degrees of inferential difficulty. In Experiment 2, three groups varying in English reading proficiency, split into groups based on their lexical decision task scores (72 native, 40 intermediate, 40 beginner readers) read general stories with or without cognitive load and answered comprehension questions requiring varying degrees of inferential difficulty. Accuracy and Reaction Time (RT) were differentially affected by working memory (OSpan), cognitive load, and inferential complexity. In Experiment 1, greater DK explained variance in effectiveness (accuracy) and efficiency (RT) as inferential complexity increased. In Experiment 2 OSpan was needed even at lower levels of inferential complexity for beginning readers. Surprisingly, for both experiments, participants responded faster under cognitive load conditions, although not at the expense of accuracy. This suggests that the episodic buffer is important for different levels of DK and proficiency, especially as the task becomes more difficult. Theoretical and practical implications of these findings are discussed.
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Kong, Jingfei. "ARCHITECTURAL SUPPORT FOR IMPROVING COMPUTER SECURITY." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2610.

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Computer security and privacy are becoming extremely important nowadays. The task of protecting computer systems from malicious attacks and potential subsequent catastrophic losses is, however, challenged by the ever increasing complexity and size of modern hardware and software design. We propose several methods to improve computer security and privacy from architectural point of view. They provide strong protection as well as performance efficiency. In our first approach, we propose a new dynamic information flow method to protect systems from popular software attacks such as buffer overflow and format string attacks. In our second approach, we propose to deploy encryption schemes to protect the privacy of an emerging non-volatile main memory technology  phase change memory (PCM). The negative impact of the encryption schemes on PCM lifetime is evaluated and new methods including a new encryption counter scheme and an efficient error correct code (ECC) management are proposed to improve PCM lifetime. In our third approach, we deconstruct two previously proposed secure cache designs against software data-cache-based side channel attacks and demonstrate their weaknesses. We propose three hardware-software integrated approaches as secure protections against those data cache attacks. Also we propose to apply them to protect instruction caches from similar threats. Furthermore, we propose a simple change to the update policy of Branch Target Buffer (BTB) to defend against BTB attacks. Our experiments show that our proposed schemes are both security effective and performance efficient.
Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science PhD
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Yeh, Ting-Chieh, and 葉丁介. "Feasibility Analyze for Double-Load AGVS of Limited Buffers." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/62284041161456451507.

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碩士
國立雲林科技大學
工業工程與管理技術研究所
85
An Automated Guided Vehicle System (AGVS) is a common material handling device a flexible manufacturing system. The tandem AGVS is so popular because it is easy to control. When an AGVS was designed in the old day, feasibility inspection of loop included two inspection functions. One is check on handle ability of AGV, the other one is check on arrival rate of empty vehicle. Despite, the two functions are essential conditions that are check on feasibility of loop, but these build on the hypothesis that capacity of buffers is unlimited. In other words, when the buffers are big enough, the two functions have higher limit ability. Once the buffers are limited for hardware, the loop will not operation for deadlock. Therefore, the purpose of this research is building an inspection model on unlimited buffers. And understand how elements influence the performance of system. At deadlock, this research suggests that deadlock problem could be solved by double-load AGV. At the same time, this research bring up the process that moving of double-load AGV and solving deadlock. By this process, double-load AGV could detect the deadlock and eliminate deadlock by two buffers of AGV. In this research, throughput of system, utilization of AGV and average flow time are selected to be the standards to analyze the influence of system of limited buffers by elements by simulation. The results show that increasing the degree of deadlock, reducing the capacity of buffers and broadening loop system would reduce the throughput of system. The larger product, throughput of system multiply the average moving distance of parts, is, the larger utilization of AGV is. Increasing the capacity of buffers and broadening loop system would increase average flow time. At the same time, this result found that the degree of deadlock and size of loop system have low influence when speed of AGV is fast enough. But increasing speed of AGV could not reduce the influence of capacity of buffers. Besides, increasing the capacity of buffers could reduce the deadlock to occur. For this reason, the set of capacity of buffers is one of important elements when designers plan the tandem AGVS.
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Jiang, Jyun-Ping, and 姜俊平. "A High Slew-Rate AMLCD Source Driver Output Buffer Applicable for Wide Load Range." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/16068056186213910450.

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碩士
臺灣大學
電子工程學研究所
98
In recent years, the trend of display goes toward high-definition (HD) display for the active-matrix liquid crystal display (AMLCD). The LCDs haves been used in wide varieties of electronic devices, from large-size TV to small-size portable gadgets. To attain high image quality, high LCD resolution is required. As the HD LCD resolution is increased, the source driver of every column line needs to have fast transient response. Therefore, the output buffer of source driver needs to provide the high slew-rate and low dc offset voltage. A high slew-rate source output driver with frequency compensation was fabricated with TSMC 0.35-μm 2P4M CMOS technology. With 5-V supply voltage, it draws only 5-μA static current. In order to meet the high-performance display quality, the slew-rate of the output buffer should be faster than 1μs under the load of 10kΩ/300pF. However, the phase margin of the circuit needs to be larger than 30° under the load of 0kΩ/50pF. Hence, the output buffer is suitable for both small LCD panels and large size LCD panels.
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Lin, I.-Fan, and 林依凡. "DDR SDRAM Buffer Management in Advanced TCA Based Load Balanced Birkhoff-von Neumann Switch." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34517681733085147727.

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Hsu, Chia-Jung, and 許家榮. "Applying Virtual Address Compression in Branch Target Buffer and Load / Store Queue in high-performance processors." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/92193125326106672956.

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碩士
國立成功大學
電腦與通信工程研究所
95
This paper proposes a virtual address compression technique for branch target buffer (BTB) and load/store queue (LSQ) that use virtual address for matching or comparisons. Since a BTB is a large address cache, applying address compression will reduce the area cost of the BTB. A load/store queue (LSQ) typically needs a fully-associative CAM structure to search the address for matching and consequently poses scalability challenges for power consumption and area cost once the number of the in-flight instructions is raised. Using the proposed approach, the BTB design is able to reduce the area usage by 53.6%-69.3% and energy consumption by 4.2%-28.5% while the LSQ can reduce the area cost by 35%-70% and energy consumption by 39%-72%. The experiment on combining the two shows that 45%-52%total area saving of the two components are achieved while providing 2.5%-3.1% overall processor energy reduction and causing only 0.2% performance loss.
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Peng, Guang-Yu, and 彭光宇. "A High Current Efficiency Rail-to-Rail Buffer for Low Drop-out Regulators With Load Regulation-Enhanced." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/09408993405943586811.

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碩士
國立彰化師範大學
積體電路設計研究所
99
The advances in portable battery-powered consumer devices need toreduce the power consumption and extend the battery lifetime powermanagement IC is necessary. Recently, low dropout regulators (LDOs) arewidely used for power management ICs in portable applications due to the low noise, simplicity, high accuracy, better line and load regulation, small outputripple voltage, and fast transient response. However, the use of increasing size of pass transistor for the LDO in larger load current system must be needed.Unfortunately, the larger pass transistor can generate a low frequency pole inLDO’s loop, thereby degrading stability. Therefore, this thesis presents a high current efficiency rail-to-rail buffer for low dropout regulators with loadregulation enhanced to solve the problem. The proposed buffer provides apush-pull output stage for driving pass transistor and superior low output resistance push the low frequency pole far beyond the unity-gain frequency toimprove the stability of the LDO loop response. Besides, two techniques are utilized for enhancing load regulation, including miller compensation and pole-zero pair generation. The whole LDO circuit has been fabricated using a TSMC 0.35μm mixedmode (2P4M 3.3V/5V) CMOS process and occupies an area of 0.735mm2. The measurement results show that the LDO with the proposed buffer dissipates 40μA quiescent current and a maximum dropout voltage of 200mV at 250mA output load. The output voltage drop with a 1-μF off-chip output capacitor for a 250mA load step is less than 30mV.
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Wang, Chun-Hao, and 王君豪. "Design and Implementation of Virtual Output Queue and Re-sequencing Buffer in Load Balanced Birkhoff-von Neumann Switch." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98662993220833130386.

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Books on the topic "Buffet loads"

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Mei yuan wei he wu xiao?: Zhan shi Zhongguo jing ji wei ji yu Zhong Mei ying dui zhi ce. Beijing: Ren min chu ban she, 2011.

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2

Chakera, Aron, William G. Herrington, and Christopher A. O’Callaghan. Disorders of acid–base balance. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0178.

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Normal metabolism results in a net acid production of approximately 1 mmol/kg day−1. Physiological pH is regulated by excretion of this acid load (as carbon dioxide) by the kidneys and the lungs. A series of buffers in the body reduces the effects of metabolic acids on body and urine pH. For acid–base disorders to occur, there must be excessive intake (or loss) of acid (or base) or, alternatively, an inability to excrete acid. For these changes to result in a substantially abnormal pH, the various buffer systems must been overwhelmed. The pH scale is logarithmic, so relatively small changes in pH signify large differences in hydrogen ion concentration. Most minor perturbations in acid–base balance are asymptomatic, as small changes in acid or base levels are rapidly controlled through consumption of buffers or through changes in respiratory rate. Alterations in renal acid excretion take some time to occur. Only when these compensatory mechanisms are overwhelmed do symptoms related to changes in pH develop. This chapter reviews the causes and consequences of acid–base disorders.
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Coricelli, Fabrizio, and Marco Frigerio. Liquidity Squeeze on SMEs during the Great Recession in Europe. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198815815.003.0005.

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We find that European SMEs significantly increased their net trade credit to sales ratio during the Great Recession. For the aggregate of SMEs, trade credit did not provide any buffer to the contraction in bank loans. In fact, through increased net trade credit, SMEs suffered a squeeze in their liquidity and this phenomenon reflects the weak bargaining power of SMEs in their trade credit relationship with larger firms. Therefore, increased net trade credit by SMEs does not reflect an efficient reallocation of credit, and it calls for policy actions. These policy actions are highly relevant, given that the liquidity squeeze had significant adverse effects on the real performance of SMEs, contributing to the recession and to the subsequent timid recovery of European economies. We explore various policies that could be implemented to relieve SMEs from the liquidity squeeze induced by the increase in their receivables.
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Inside Commodore DOS: The Complete Guide to the 1541 Disk Operating System. Brady Publishing, 1986.

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Wilmarth Jr., Arthur E. Taming the Megabanks. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190260705.001.0001.

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This book demonstrates that universal banks—which accept deposits, make loans, and engage in securities activities—played central roles in precipitating the Great Depression of the early 1930s and the Great Recession of 2007–09. Universal banks promoted a dangerous credit boom and a hazardous stock market bubble in the U.S. during the 1920s, which led to the Great Depression. Congress responded by passing the Glass-Steagall Act of 1933, which separated banks from the securities markets and prohibited nonbanks from accepting deposits. Glass-Steagall’s structural separation of the banking, securities, and insurance sectors prevented financial panics from spreading across the U.S. financial system for more than four decades. Despite Glass-Steagall’s success, large U.S. banks pursued a twenty-year campaign to remove the statute’s prudential buffers. Regulators opened loopholes in Glass-Steagall during the 1980s and 1990s, and Congress repealed Glass-Steagall in 1999. The United Kingdom and the European Union adopted similar deregulatory measures, thereby allowing universal banks to dominate financial markets on both sides of the Atlantic. In addition, large U.S. securities firms became “shadow banks” as regulators allowed them to issue short-term deposit substitutes to finance long-term loans and investments. Universal banks and shadow banks fueled a toxic subprime credit boom in the U.S., U.K., and Europe during the 2000s, which led to the Great Recession. Limited reforms after the Great Recession have not broken up universal banks and shadow banks, thereby leaving in place a financial system that is prone to excessive risk-taking and vulnerable to contagious panics. A new Glass-Steagall Act is urgently needed to restore a financial system that is less risky, more stable and resilient, and better able to serve the needs of our economy and society.
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Book chapters on the topic "Buffet loads"

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Loosen, Simon, Matthias Meinke, and Wolfgang Schröder. "Numerical Analysis of the Turbulent Wake for a Generic Space Launcher with a Dual-Bell Nozzle." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 163–77. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_10.

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Abstract The turbulent wake of an axisymmetric generic space launcher equipped with a dual-bell nozzle is simulated at transonic ($$Ma_\infty = 0.8$$ and $$Re_D = 4.3\cdot 10^5$$) and supersonic ($$Ma_\infty = 3$$ and $$Re_D = 1.2\cdot 10^6$$) freestream conditions, to investigate the influence of the dual-bell nozzle jet onto the wake flow and vice versa. In addition, flow control by means of four in circumferential direction equally distributed jets injecting air encountering the backflow in the recirculation region is utilized to determine if the coherence of the wake and consequently, the buffet loads can be reduced by flow control. The simulations are performed using a zonal RANS/LES approach. The time-resolved flow field data are analyzed by classical spectral analysis, two-point correlation analysis, and dynamic mode decomposition (DMD). At supersonic freestream conditions, the nozzle counter pressure is reduced by the expansion of the outer flow around the nozzle lip leading to a decreased transition nozzle pressure ratio. In the transonic configuration a spatio-temporal mode with an eigenvalue matching the characteristic buffet frequency of $$Sr_D=0.2$$ is extracted by the spectral and DMD analysis. The spatial shape of the detected mode describes an antisymmetric wave-like undulating motion of the shear layer inducing the low frequency dynamic buffet loads. By flow control this antisymmetric coherent motion is weakened leading to a reduction of the buffet loads on the nozzle fairing.
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Levinski, Oleg. "Use of Artificial Neural Networks for Buffet Loads Prediction." In Developments in Applied Artificial Intelligence, 9–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-48035-8_2.

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Abdulla, Parosh Aziz, Mohamed Faouzi Atig, Ahmed Bouajjani, and Tuan Phong Ngo. "Replacing Store Buffers by Load Buffers in TSO." In Lecture Notes in Computer Science, 22–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00359-3_2.

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Toth, Thomas, and Christopher Kruegel. "Accurate Buffer Overflow Detection via Abstract Pay load Execution." In Lecture Notes in Computer Science, 274–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-36084-0_15.

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Zhou, Rui, Guoren Wang, Donghong Han, Pizhen Gong, Chuan Xiao, and Hongru Li. "Buffer-Preposed QoS Adaptation Framework and Load Shedding Techniques over Streams." In Web Information Systems – WISE 2006, 234–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11912873_25.

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Hou, Jiaoyi, Hua Zhou, Jun Zou, and Xin Fu. "Velocity Control of the Horizontal Buffer System for Heavy Load Forging Manipulator." In Intelligent Robotics and Applications, 296–304. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16587-0_27.

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Bhattacharya, Pronaya, Amod Kumar Tiwari, Akhilesh Ladha, and Sudeep Tanwar. "A Proposed Buffer Based Load Balanced Optical Switch with AO-NACK Scheme in Modern Optical Datacenters." In Proceedings of ICETIT 2019, 95–106. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30577-2_8.

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Jung, Walt, and Walt Kester. "Buffer Amplifiers and Driving Capacitive Loads." In Op Amp Applications Handbook, 493–504. Elsevier, 2005. http://dx.doi.org/10.1016/b978-075067844-5/50143-0.

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Radev, Dimitar, Izabella Lokshina, and Svetla Radeva. "Modeling and Simulation of Self-Similar Traffic in Wireless IP Networks." In Networking and Telecommunications, 1631–47. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-986-1.ch105.

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The article examines self-similar properties of real telecommunications network traffic data over a wide range of time scales. These self-similar properties are very different from the properties of traditional models based on Poisson and Markov-modulated Poisson processes. Simulation with stochastic and long range dependent traffic source models is performed, and the algorithms for buffer overflow simulation for finite buffer single server model under self-similar traffic load SSM/M/1/B are explained. The algorithms for modeling fixedlength sequence generators that are used to simulate self-similar behavior of wireless IP network traffic are developed and applied. Numerical examples are provided, and simulation results are analyzed.
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Barrouillet, Pierre, and Valérie Camos. "The Time-Based Resource-Sharing Model of Working Memory." In Working Memory, 85–115. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198842286.003.0004.

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The time-based resource-sharing model considers working memory as the workspace in which mental representations are built, maintained, and transformed for completing goal-oriented tasks. Its main component is made of an episodic buffer and a procedural system that form an executive loop in which processing and storage share domain-general attentional resources on a temporal basis. Because working memory representations decay with time when attention is diverted, the cognitive load of a given activity is the proportion of time during which it occupies attention and prevents it from counteracting this decay through attentional refreshing. Consequently, recall in working memory tasks is an inverse function of the cognitive load of concurrent processing. Besides this system, an independent domain-specific maintenance system exists for verbal, but not visuospatial, information. Within this framework, working memory development mainly results from increasing processing speed that affects both the duration of the distraction of attention by concurrent tasks and refreshing efficiency.
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Conference papers on the topic "Buffet loads"

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ZIMMERMAN, N., M. FERMAN, R. YURKOVICH, and G. GERSTENKORN. "Prediction of tail buffet loads for design application." In 30th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-1378.

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Schwarz, Jordan. "A Methodology for Mapping Launch Vehicle Buffet Loads." In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
18th AIAA/ASME/AHS Adaptive Structures Conference
12th. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-3123.

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Moses, Robert W., Carol D. Wieseman, Aaron A. Bent, and Alessandro E. Pizzochero. "Evaluation of new actuators in a buffet loads environment." In SPIE's 8th Annual International Symposium on Smart Structures and Materials, edited by Anna-Maria R. McGowan. SPIE, 2001. http://dx.doi.org/10.1117/12.429653.

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Yang, Shuchi, Ping-Chih Chen, Xiaoquan Wang, Marc P. Mignolet, Dale M. Pitt, and Jessica Loyet. "Prediction of Buffet Loads of F-15 with FUN3D Solver." In 54th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-0305.

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Chyczewski, Thomas S. "Steady Reynolds Averaged Navier Stokes Equation-Based Buffet Loads Estimation." In 34th AIAA Applied Aerodynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4045.

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RAGAB, MOHAMED. "Contribution of buffet to space vehicle loads during atmospheric flight." In 30th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-716.

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Spiekermann, C., and A. Kabe. "Statistical combination of launch vehicle gust and buffet atmospheric flight loads." In 39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2010.

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Pototzky, Anthony, and Robert Moses. "An Analysis Method to Predict Tail Buffet Loads of Fighter Aircraft." In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2291.

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Burnham, J. "Predicted dynamic buffet loads from limited response measurements - T-45A horizontal tail." In 36th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-1338.

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James, K. D., and L. A. Meyn. "Dependence of Integrated Vertical-Tail Buffet Loads For F/A-18 on Sensor Density." In Aerospace Atlantic Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941140.

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