Relevant bibliographies by topics / Slat

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Slat'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Slat"

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Kukhmazov, Kukhmaz, and Vladimir Konovalov. "Substantiation of the parameters of the feeder chamber conveyor of the combine harvester header." E3S Web of Conferences 258 (2021): 04006. http://dx.doi.org/10.1051/e3sconf/202125804006.

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The aim of the research was to check the possibility of using and the justification of design and operating parameters of the proposed chain-and-slat conveyor of the feeder house for harvesting grain crops on the example of wheat. The research methodology included the determination of grain losses and crushing behind the combine thresher when varying the slat pitch of the chain-and-slat transporter (153.6; 307.2 and 460.8 mm), the speed of moving these slats (2.0...5.0 m/s) and the speed of the combine (1.2...2.4 m/s). The researches made on chain-and-slat conveyor of the combine harvester’s feeder house have shown that it can be used in the harvester’s design. The rational values of design and mode parameters of chain-and-slat conveyor of the combine harvester’s feeder house have been justified by laboratory and field studies. At a pitch of stamped slats of the chain-and-slat conveyor of 307.2 mm, a speed of chain-and-slat conveyor slats of 2.8...3.6 m/s and a working speed of the combine of 2.2 m/s, grain losses behind the threshing machine and grain crushing amount to less than one percent that meets the agricultural requirements.
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Hashimoto, Marie, Jun-ichi Nagao, Shojiro Ikezaki, Sonoko Tasaki, Ken-ichi Arita-Morioka, Yuka Narita, Tamaki Cho, Kenji Yuasa, Amnon Altman, and Yoshihiko Tanaka. "Identification of a Novel Alternatively Spliced Form of Inflammatory Regulator SWAP-70-Like Adapter of T Cells." International Journal of Inflammation 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/1324735.

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Activation of naive CD4+ T cells results in the development of several distinct subsets of effector Th cells, including Th2 cells that play a pivotal role in allergic inflammation and helminthic infections. SWAP-70-like adapter of T cells (SLAT), also known as Def6 or IBP, is a guanine nucleotide exchange factor for small GTPases, which regulates CD4+ T cell inflammatory responses by controlling Ca2+/NFAT signaling. In this study, we have identified a novel alternatively spliced isoform of SLAT, named SLAT2, which lacks the region encoded by exons 2–7 of the Def6 gene. SLAT2 was selectively expressed in differentiated Th2 cells after the second round of in vitro stimulation, but not in differentiated Th1, Th17, or regulatory T (Treg) cells. Functional assays revealed that SLAT2 shared with SLAT the ability to enhance T cell receptor- (TCR-) mediated activation of NFAT and production of IL-4 but was unable to enhance TCR-induced adhesion to ICAM-1. Ectopic expression of SLAT2 or SLAT in Jurkat T cells resulted in the expression of distinct forms of filopodia, namely, short versus long ones, respectively. These results demonstrate that modulating either SLAT2 or SLAT protein expression could play critical roles in cytokine production and actin reorganization during inflammatory immune responses.
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Devillers, Nicolas, Emmanuel Janvier, Farhoud Delijani, Steve Méthot, Kristopher J. Dick, Qiang Zhang, and Laurie Connor. "Effect of Slat and Gap Width of Slatted Concrete Flooring on Sow Gait Using Kinematics Analysis." Animals 9, no. 5 (April 30, 2019): 206. http://dx.doi.org/10.3390/ani9050206.

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The housing of gestating sows in groups requires sound information about the adapted design of the pen floor. Slatted concrete floors are commonly used for effective drainage of manure but can cause feet injuries and lameness. In the present study, kinematics were used to characterize the gait of 12 gilts and 12 lame sows walking in a corridor on slatted concrete floors with different combinations of slat (85, 105 or 125 mm) and gap (19, 22 or 25 mm) widths. The nine experimental floors were tested with slats in the perpendicular and parallel orientation to the direction of animal walk, according to a duplicated lattice design. Gait parameters were quantified using spatial, temporal and angular kinematics for front and rear limbs. Some parameters were significantly affected by the treatments (p < 0.05), but the effects differed between gilts and lame sows and between slat orientations. Gap width had a significant effect on parameters such as back angle, stride length, foot height, and carpal and tarsal joint angle amplitudes. Slat width significantly affected parameters such as foot height, and carpal and tarsal joint angle amplitudes. Comparisons of the different combinations of slat and gap widths revealed that slats with a width of 105–125 mm and gap width of 19–22 mm had the least effect on the gait characteristics of the gilts and sows.
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Wang, Hongjian, Junyuan Tian, and Wang Luo. "Three-Dimensional Simulation Analysis of the Influence of Slat Structural Parameters on Slat Aerodynamic Noise." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 6 (December 2019): 1129–37. http://dx.doi.org/10.1051/jnwpu/20193761129.

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Slat aerodynamic noise is one of important components of the frame noise. Adjusting the parameters of the slat structure can suppress the slat noise radiation effectively. Based on the typical multi-element airfoil 30P30N, firstly, by means of adjusting the parameters of slat structure, such as changing relative positions between slat and main airfoil and closing slat gap etc., a new slat profile is obtained; Then, based on the DDES simulation method, the characteristics of vortex distribution is analyzed for the new airfoil structure model, and the directivity and SPL of the far field noise are also investigated; Finally, through comparison analysis of the parameters, the physics of the generation of slat aerodynamic noise is discovered, and effects of slat parameters on the features of slat aerodynamic noise are also obtained. The results of the study show that the vortex strength of the flow around the slat has close relation to the source of slat noise. By means of adjusting slat position parameters and morphing of the slat's trailing edge, the vortex strength of the flow close to the slat cusp is reduced effectively, and further largely reducing the slat noise radiation, which can be achieved with preserving high lift coefficient of the airfoil.
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Ge, Chang Jiang, and Mei Chen Ge. "High-Lift Mechanism of a Bionic Slat." Applied Mechanics and Materials 461 (November 2013): 220–29. http://dx.doi.org/10.4028/www.scientific.net/amm.461.220.

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To avoid broadband noise from a slat cove, the deployed slat contour is usually modified by filling cove, but the design is sensitive to aerodynamic performance. In the paper, a bionic slat without a cove is built on the basis of a bionic airfoil (i.e. stowed bionic multi-element airfoil), which is extracted from a long-eared owl wing. The quasi-two-dimensional models with a deployed bionic slat and a stowed bionic slat are manufactured by rapid manufacturing and prototyping system, respectively, and measured in a low-turbulence wind tunnel. The results are used to characterize high-lift effect: the lift coefficients of the model with a stowed slat are larger at less than 4°angle of attack, but the model with a deployed slat has the larger lift coefficients at greater than 4°angle of attack. Furthermore, the deployed bionic slat can increase stall angle and maximum lift coefficient, but also delay the decline of the lift coefficient curve slope meaning that the leading-edge separation is postponed within a certain range of angle of attack. At the same time, the flow field around the models is visualized by smoke wire method. The leading-edge separation of the model with a stowed slat is shown at low Reynolds number and angle of attack. However, the finding does not occur in the flow field of the model with a deployed slat at the same conditions, probably because the gap between the bionic slat and the main wing results in favorable pressure gradient, the deployed bionic slat decreases the peak of adverse pressure gradient by increasing the chord of the bionic multi-element model, and the bionic slat wake excites transition to the boundary layer on upper surface of the main wing. This superiority may be used as reference in the design of the leading-edge slat without a cove.
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Kamliya Jawahar, Hasan, Syamir Alihan Showkat Ali, and Mahdi Azarpeyvand. "Aeroacoustic analysis of slat tones." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5650–63. http://dx.doi.org/10.3397/in-2021-3202.

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Experimental measurements were carried out to assess the aeroacoustic characteristics of a 30P30N high-lift device, with particular attention to slat tonal noise. Three different types of slat modifications, namely slat cove filler, serrated slat cusp, and slat finlets have been experimentally examined. The results are presented for an angle of attack of α = 18 at a free-stream velocity of U = 30 m/s, which corresponds to a chord-based Reynolds number of Re = 7 x 10. The unsteady surface pressure near the slat region and far-field noise were made simultaneously to gain a deeper understanding of the slat noise generation mechanisms. The nature of the low-frequency broadband hump and the slat tones were investigated using higher-order statistical approaches for the baseline 30P30N and modified slat configurations. Continuous wavelet transform of the unsteady surface pressure fluctuations along with secondary wavelet transform of the broadband hump and tones were carried out to analyze the intermittent events induced by the tone generating resonant mechanisms. Stochastic analysis of the wavelet coefficient modulus of the surface pressure fluctuations was also carried out to demonstrate the inherent differences of different tonal frequencies. An understanding into the nature of the noise generated from the slat will help design the new generation of quite high-lift devices.
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Caimbeul, Maoilios, and Maoilios Cambeul. "Slat den stoc." Comhar 45, no. 6 (1986): 19. http://dx.doi.org/10.2307/20556007.

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Mendoza, J. M., T. F. Brooks, and W. M. Humphreys. "An Aeroacoustic Study of a Leading EDGE Slat Configuration." International Journal of Aeroacoustics 1, no. 3 (September 2002): 241–74. http://dx.doi.org/10.1260/147547202320962583.

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Aeroacoustic evaluations of high-lift devices have been carried out in the Quiet Flow Facility of the NASA Langley Research Center. The present paper describes detailed flow and acoustic measurements that have been made in order to better understand the noise generated from airflow over a wing leading edge slat configuration, and to possibly predict and reduce this noise source. The acoustic database is obtained by a moveable Small Aperture Directional Array of microphones designed to electronically steer to different portions of models under study. The slat is shown to be a uniform distributed noise source. The data was processed such that spectra and directivity were determined with respect to a one-foot span of slat. The spectra are normalized in various fashions to demonstrate slat noise character. In order to equate portions of the spectra to different slat noise components, trailing edge noise predictions using measured slat boundary layer parameters as inputs are compared to the measured slat noise spectra.
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Liu, Pei Qing, Yan Xiang Cui, Liang Wang, and Qiu Lin Qu. "Computational Investigation of the Slat Blowing Control for High-Lift Airfoil." Applied Mechanics and Materials 138-139 (November 2011): 223–28. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.223.

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Based on the characteristics of blowing control, a new technique was put forward to weaken slat cove separation and reduce noise. The effect of the slat blowing control on lift performance, the flow field and noise with a three-element high lift aerofoil was investigated by using the computational fluid dynamics (CFD) code of Fluent and the Reynolds-averaged Navier-Stokes equations. The blowing apertures were set on the lower surface of the slat. By using the slat blowing technique, the slat cove separation can be controlled efficiently and the lift coefficient increased. The aerodynamic performance varies with different blowing flow rates and angles of attack.
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Sander, J. E., J. L. Wilson, I. H. Cheng, and P. S. Gibbs. "Influence of Slat Material on Hatching Egg Sanitation and Slat Disinfection." Journal of Applied Poultry Research 12, no. 1 (March 2003): 74–80. http://dx.doi.org/10.1093/japr/12.1.74.

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Dissertations / Theses on the topic "Slat"

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Mahmood, S. T. "Design of a clinical brain SPECT based on optimized multi slit-slat collimation." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/1233364/.

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Parallel-hole collimators are the most widely used collimators in clinical SPECT imaging. However the performances of these collimators are limited in terms of efficiency and resolution, 0.01% and 1cm at 10cm distance from the detector face, respectively. Simultaneous optimisation is not possible due to existence of a fundamental trade-off between resolution and efficiency. Hence an alternative method of increasing efficiency without compromising resolution is necessary. Slit-slat collimator provides a better alternative to parallel-hole, due to their magnification power. The aim and objectives of this PhD work was to design and optimise a clinical brain SPECT system based on slit-slat collimation and a novel detector with silicon drift diodes (SDDs) readout providing 1mm intrinsic resolution. The system efficiency can be improved by increasing the number of slits, however as the number of slits increases, so does the multiplexing, which is the overlapping of the projections on the detector plane. We hypothesize that the reconstruction of multiplexed (MX) projections can be improved by addition of non-MX projections. We have proved this using simulation and shown that a gain in signal to noise ratio (SNR) (25.5%) corresponding to 43% reduction in acquisition time was achievable when non-MX projections were available. Several novel system designs that utilise the SDDs technology with mixed degrees of multiplexing have been evaluated. To enable experimental validation of the simulation work, a prototype slit-slat collimator was designed and built for a conventional gamma camera. Full calibration of the system was performed, the efficiency and resolution profiles were measured and studies of point sources, Jaszczak and Striatal phantoms were completed. The results of these studies confirmed the potential for multiplexing to improve image quality when used in conjunction with non-multiplexed projections with a maximum gain in SNR equivalent to of 50.6%.
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Chen, Peng. "Identification and attenuation of slat noise." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348864/.

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In the case of civil transport aircraft, engines were the dominant noise source until the advent of the high-bypass ratio engines in the early 1970s. Since then, airframe noise has become more important, particularly during the approach-to-landing stage of aircraft operations. The main components of airframe noise are the flap side edge, leading edge slat, and the landing gear. Experiments in both the wind tunnel and via fly-over measurements have shown that the slat noise is a major contributor to the overall airframe noise during the landing approach for a commercial aircraft. To achieve the goal of reducing slat noise significantly without adversely affecting the aerodynamic performance of the wing, it is obligatory to improve the understanding of the mechanism of slat noise generation. Experiments and numerical simulations were performed to investigate the phenomena of slat noise. It was found that the slat broadband noise generation is governed by two kinds of mechanism. At a low angle of attack of the wing, the typical circulation region is not formed in the slat cove and the slat noise level is low. As the angle of attack increases to a certain value, vortical structures are intermittently generated due to flow interaction occuring between the shear layer originating from the slat cusp and the flow convected from the stagnation line on the main element. Intense slat noise is produced as the vortical structures approach the slat cove surface. With the angle of attack increasing further, the slat noise becomes weak again. The interaction effect tends to become weaker as the shear layer deviates away from the surface of the main element. Two approaches with the aim of attenuating the slat noise were experimentally and numerically studied. The first approach was to reduce the slat noise using air blown on the suction surface of the slat near its trailing edge. A numerical simulation showed that the slat noise levels over most of the frequencies, especially above a St number of 7, were obviously attenuated. In the second approach, a strip mounted on the pressure surface of the main element model was experimentally proven to be an effective method for reducing the broadband slat noise at an angle of attack of 8 degrees and a freestream velocity of 25 m/s. The position and height of the strip also influenced the level of the reduction. Several tonal noise components appear in the slat noise spectrum at an angle of attack of 4 degrees and a freestream velocity of 25 m/s. The dominant tone is associated with the vortex shedding off the slat cusp through the Kelvin-Helmholtz instability. This tone was successfully suppressed using a plasma actuator employing an open-loop control. A maximum reduction of 11 dB was achieved at a St number of approximately 19.7. A quasi-static feedback control system was also developed, wherein a controller is responsible for calculating the control inputs in terms of ii feedback signals. The experimental results show that the controller can work effectively to suppress the slat noise.
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Sahin, Hakan. "Addressing Adaptive Structure Technology to Reduce the Airframe Noise(Link)." Thesis, KTH, Hållfasthetslära (Avd.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132231.

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ABSTRACTThe purpose of this thesis is to design and analyze the new generation leading edge slat of a commercial jet to reduce the structural noise with the application of new conceptual design approaches. Recent scientific research show that the leading edge slats account for the structural noise during the flight operation therefore, when the leading edge slat is deployed under different flight conditions, an open gap/slot is formed between the high lift device and the wing box. However, since the leading edge slat includes flexible sections, it is assumed that defining an adaptive system inside the leading edge slat may reduce the structural noise by utilizing bending properties of these flexible sections. Hence, electromechanical actuator designing gains also great importance in the whole process. In this study, we have used, finite element modelling of the slat structure to examine the required structural deformations and strengths; our work is based on the software ANSYS/Workbench. To be realistic in deciding the right geometry in the follow up steps, we have first studied a generic geometry having no aerodynamics or actuator forces application. The whole simulation was performed by defining dummy forces and dummy material properties. The simulation lead to having a global overview of the mechanical behaviour of the structure; further, once the influent parameters were tested, realistic aerodynamic forces and material properties were defined, and as a result of bending of the flexible sections the required gap closure was formed between the trailing edge of the slat and the wing box. Subsequently, the suitable actuator design and required strength analysis are also performed on the last section. This study has also proved that the use of adaptive systems on the leading edge slats improves flight comfort by reducing the structural noise and provides less fuel consumption; this is significant for the long run considerations of aeroplane manufacturers.
es Zentrum für Luft- und Raumfahrt e. V. (DLR)
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Decolongon, Joji. "The influence of slat material, slat coverage and breeder age on broiler breeder reproduction and progeny growth." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28978.

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This study was conducted to examine the potential of plastic slats as flooring material for maintenance of broiler breeders. Although plastic slats are more expensive than wood slats, plastic slats are more durable and easier to clean. Wood and plastic slats were tested as full and partial flooring to determine the ideal proportion of slats for broiler breeder floors. Space allotment was 2040 cm²/bird on all floor treatments. . Arbor Acres broiler breeders, one of the more common strains in British Columbia, were raised to 58 weeks of age to monitor the influence of slat material and slat coverage on egg production and progeny growth over one production cycle. Since the pens were not set up to determine the number of eggs lost through slats, "egg production" values were actually egg recovery values. Over-all egg recovery was significantly higher on partial wood (PWS) and partial plastic slats (PPS) than on either of the full slat treatments. Breeders on full wood slats (FWS) had higher over-all egg production than those on full plastic slats (FPS). Differences were significant for three biweekly periods, but slats did not influence the over-all incidence of floor eggs and cracked floor eggs. The incidence of cracked nest eggs was significantly higher in FWS and FPS than in PWS and PPS pens during four lay periods and overall. The proportion of non-cracked nest eggs, which was taken as an approximation of the proportion of settable eggs, was higher for partial slat pens than full slat pens, and FWS pens had a higher proportion of non-cracked nest eggs than FPS pens. To monitor fertility and hatchability, eggs were incubated at 37, 42, 46, 50 and 56 weeks of breeder age. Fertility, hatchability of total eggs set and hatchability of fertile eggs was not affected by type of slats. Progeny from the hatch at 37, 46 and 56 week of breeder age were grown in Petersime battery cages to three weeks of age. The progeny of breeders on FPS had lower first week weight gain than the other progeny groups due to moisture loss when 7 FPS progeny were lost during the second growth trial. Weekly and over-all feed conversion of progeny was not affected by types of slats used by parents. The 56th week progeny were grown in Petersime battery cages to market age (six weeks). PWS and FPS progeny had higher third week weight gain than PPS progeny. During the sixth week, FWS and PWS progeny had higher weight gain than FPS and PPS progeny. The sixth week feed conversion of FPS progeny was higher than that of the other three progeny groups. No other differences were seen. As long as slats were used as partial flooring, there were no differences in egg production on wood or plastic slats. The proportion of "settable" eggs, fertility, and hatchability of eggs of plastic slat breeders were comparable with that of wood slat breeders regardless of slat coverage. There were significant differences in the 3-week growth of 37th, 46th and 56th week progeny and the 6-week growth of 56th week progeny on the different slat types, but the differences were not due to slat treatments. There was no interaction between breeder age and slat material, therefore the influence of slat material on egg production and progeny growth did not vary with breeder age. Although egg recovery and the number of settable eggs were lower for FPS breeders, breeders on plastic slats performed as well as those on wood slats in the present study.
Land and Food Systems, Faculty of
Graduate
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Wells, Andrew K. "Slat aerodynamics and aeroacoustics with flow control." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/49932/.

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This study primarily investigated the flow and aeroacoustics associated with the slat of a three-element aerofoil in approach conditions. The study assessed importance of several factors and examined their aerodynamic impacts. The factors investigated were aerofoil incidence, slat angle, slat cusp geometry, fixing transition and blowing in the slat cove. A combination of experimental and computational techniques investigated the factors selected. The experimental work employed PIV, pressure tap, a force balance, flush mounted microphones and an acoustic array. The computational work used DES along with the FW-H acoustic analogy to obtain the far-field directivity. Tonal features occurred at high incidence and originated at the slat trailing edge, due to the blunt trailing edge and gap, and at the reattachment point. Fixing transition removes the tone at the reattachment point and reduces the slat gap tone at the trailing edge but does not remove the tone generated by the blunt trailing edge. All of the tones found, only occurred at certain slat and wing settings. Broadband sound was present in all conditions but had a strong dependence on the incidence of the wing. The sound was loudest with the wing at  = 5o with a reduction as the wing incidence was increased. The broadband sound also reduced as the slat angel decreased from S = 23o. The shear incidence angle was a good indicator of the impact of these two factors on the sound generated. Extending the slat cusp reduced the broadband sound at low aerofoil incidence. However, for   10o the extension led to increased broadband sound. Neither blowing nor fixing transition had a significant impact on the broadband sound generated by the slat system. The aerodynamic loads generated by the wing were mainly dependent on the aerofoil incidence. However, other factors did influence the forces generated. Reducing the slat angle increased the lift generated by the wing especially at low aerofoil incidence but the lift to drag ratio was unaltered. At high aerofoil incidence, extending the slat cusp reduced the lift generated. Blowing and fixing transition did not significantly alter the forces generated by the wing.
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Drescher, Leo. "An Asynchronous Digital Interface for SLAT Telemetry." International Foundation for Telemetering, 1987. http://hdl.handle.net/10150/615293.

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International Telemetering Conference Proceedings / October 26-29, 1987 / Town and Country Hotel, San Diego, California
This paper describes telemetry used in the Supersonic Low Altitude Target (SLAT) built for the U.S. Navy by Martin Marietta. Feeding digital inputs directly to a pulse code modulation (PCM) encoder, bypassing the analog-to-digital (A/D) converter, and injecting into the output PCM wavetrain is well known. Various techniques for accomplishing this have been reported; however, they all have time correlation and synchronization problems. The system to be described involves asynchronous data transfer from the digital computer to the PCM encoder. The system uses a dual-port random-access memory (RAM) to effectively decouple the computer output, which is running synchronously on its 6 MHz clock, from the PCM wavetrain, which is running at 128 kilobits per second. Data from the computer is being "written into" the RAM simultaneously while data is being "read out." Contention arbitration prevents loss of data when read and write ports of the same address are activated. A "forbidden code" provides a special code when the computer is not connected or is producing all zeros.
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Souza, Leandro Magalhães Silva de. "Análise de mecanismos : estudo de caso para slat." Instituto Tecnológico de Aeronáutica, 2009. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1253.

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Mecanismo é um conjunto de elos, ligados por juntas, que se movem relativamente uns aos outros. A análise de mecanismos consiste em verificar o funcionamento do sistema mecânico a fim de entender o comportamento e a viabilidade para uma determinada função. Nesta dissertação será feito um estudo de um tipo específico de mecanismo usado em um slat. Slats, ou flapes de bordo de ataque são sistemas aerodinâmicos de hipersustentação localizados no bordo de ataque de aeronaves, utilizados para aumentar o desempenho em fases de decolagem e pouso. O trabalho apresenta uma série de dispositivos de hipersustentação com intuito de mostrar os tipos de mecanismos mais utilizados em aeronaves. O projeto tridimensional do sistema será feito, serão calculados parâmetros aerodinâmicos do mesmo e finalmente uma simulação computacional será feita. Esta análise consistirá em modelar o funcionamento do sistema considerando o sistema de multicorpos rígidos com e sem folga. O objetivo é estimar os esforços no atuador quando o sistema está condicionado aos esforços aerodinâmicos e verificar se há travamento do sistema. Além disso, a contribuição de folgas no desempenho do sistema será avaliada.
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Ma, Zhaokai. "Numerical investigation of slat noise attenuation using acoustic liners." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/66083/.

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Abstract Noise generated by high-lift devices such as slats on a wing is a major contributor to the overall airframe noise during the landing approach of a commercial aircraft. In this work the concept of attenuating slat noise using absorptive acoustic lin- ers in the slat/main element gap is explored using a time domain computational aeroacoustic (CAA) technique. The aims of the development and application of the computational method are to reveal the mechanism of the slat noise generation and demonstrate the feasibility of controlling the slat noise using acoustic liners. A model scale three-element high-lift airfoil comprising a main element, a leading edge slat and trailing edge °ap geometry is employed in the investigation. Numerical simulations are performed to investigate the generation and far ¯eld propagation of the slat noise. A numerical approach is developed that combines near ¯eld °ow computation with an integral radiation model to predict the far ¯eld acoustic signal. A time domain impedance boundary condition (TDIBC) is implemented to simulate the e®ect of the liner material directly. Both the high frequency tonal noise and low frequency broadband noise generated from the slat are investigated. For the high frequency tonal noise, an unsteady Reynolds-averaged Navier-Stokes (URANS) simulation using high-order spatial and temporal schemes for the wing without acoustic liners shows the presence of vortex shedding and associated high frequency acoustic sources behind the slat trailing edge. To evaluate the mitigating performance of liners on the generated noise and ¯nd an optimized liner impedance value, an exercise is conducted on a range of liner impedance values by solving the linearized Euler equations (LEE) for a modeled acoustic source located at the trailing edge of the slat to ¯nd a optimized one. Using the optimized impedance value, URANS computations for the wing with liner treatment are conducted. The results show that acoustic liners on the slat cove and on the main element can provide useful attenuation of the high frequency slat trailing edge noise. For the low frequency broadband noise, the noise sources are calculated by both the pseudo-laminar zonal method and the stochastic noise generation and radiation i (SNGR) approach. The pseudo-laminar zonal calculation is basically an URANS calculation with the two-equation shear stress transport (SST) · ¡ ! model to model the e®ect of turbulence and a region in the slat cove is set as laminar zone. In the SNGR approach broadband sources of noise are modeled using stochastic noise generation method from a numerical solution of the steady Reynolds-averaged Navier-Stokes (RANS) equations using the · ¡ ! closure and then the acoustic ¯eld is calculated by solving the acoustic perturbation equations (APE) using high- order spatial and temporal schemes. By comparing the results of pseudo-laminar method and that of SNGR approach, the SNGR method has been shown to be a potentially useful method to model the generation of broadband slat noise and to investigate the attenuation of slat gap acoustic liners, for which the interest is in changes of noise level rather than the absolute value. The broadband noise attenuation e®ect of the acoustic liner treatment is studied by applying a broadband TDIBC to the acoustic ¯eld obtained by the SNGR method. The far-¯eld directivity is obtained through an integral surface solution of Ffowcs Williams and Hawkings (FW-H) equation. Predictions for a non-optimized acoustic liner show a moderate amount of attenuation. To accurately simulate the broadband noise generation and radiation, a LES using a high-order spatial scheme and implicit temporal integration is conducted for the high-lift con¯guration with slat deployed and the calculated results show the characteristic of the unsteady °ow and the mechanisms of the broadband noise generation. The recorded noise sources are then used to drive the APE to simulate the noise propagation and the attenuation by acoustic liners. The source driven APE results agree well with that of LES in term of far ¯eld directivity and sound pressure level. Similar to the SNGR simulation, a moderate amount of attenuation is achieved by the acoustic liner treatment.
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Wang, Xin. "Computational aeroacoustic study of aircraft slat tracks and cut-outs." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/372765/.

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As one of the major contributors to aircraft noise, the noise generated by high-lift devices has been explored for many years. However, the noise related to the slat track system, which includes all the extrusive components connecting the slat and the main element, is still generally studied through experimentation due to the complex geometry. In this project, the aerodynamics and aeroacoustics of the slat track and cut-out, especially the main element cut-out, were investigated through numerical simulations for the first time. Two methods were employed in this work. Noise propagation is first studied via a compact source model to evaluate the contribution of each source individually and to investigate the influence of the slat track system on the noise propagation in the slat region. The APE-IV system was employed but modified by using a more accurate expression of enthalpy perturbation to calculate the acoustic fields. The results show that both the slat track system and the background flow modify the sound propagation path. The energy radiated towards the ground is increased due to the interaction of sound waves with the slat track system and the background flow. Detached eddy simulations were run to investigate the mechanisms of the slat track and cut-out noise generation. Major noise sources in the slat cove region are identified and a noise generation feedback loop is proposed. The results show that the increment of noise levels due to the existence of the slat track system is two-fold. The slat track and the cut-out generate noise individually and they also amplify the noise generated within the slat region when the sound waves propagate though the slat cove area and interact with the slat track and cut-out. The dominant frequencies of the spectrum are seen to shift towards the high frequencies due to these added on components. In this work, two kinds of possible noise attenuation approaches were proposed and studied. Geometries based on replacing the sharp cut-out on the main element leading edge with an edge-rounded or a sealed cut-out have been proved to be able to reduce the cut-out noise significantly. Application of acoustic bulk absorbing material can also attenuate the cut-out noise efficiently for a certain range of frequencies.
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König, Daniel [Verfasser]. "Local Large-Eddy Simulation of a Slat-Wing Configuration / Daniel König." Aachen : Shaker, 2010. http://d-nb.info/1122546866/34.

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Books on the topic "Slat"

1

Slonski, Miroslaw Aleksander. Optimized slat configurations for hydrodynamic applications. [Toronto, Ont.]: Dept. of Aerospace Science and Engineering, University of Toronto, 1992.

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Slonski, Miroslaw Aleksander. Optimized slat configurations for hydrodynamic applications. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1993.

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Vasylyev, Sergey. Slat-array concentrator development: PIER final project report. [Sacramento, Calif.]: California Energy Commission, 2009.

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Hugues, P. Plantin De. Effect of an extendable slat on the stall behavior of a VR-12 airfoil. Moffett Field, Calif: Ames Research Center, 1993.

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Board, United States National Transportation Safety. Inadvertent in-flight slat deployment: China Eastern Airlines flight 583, McDonnell Douglas MD-11, B-2171, 950 nautical miles south of Shemya, Alaska April 6, 1993. Washington, D.C: The Board, 1994.

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United States. National Transportation Safety Board. Inadvertent in-flight slat deployment: China Eastern Airlines flight 583, McDonnell Douglas MD-11, B-2171, 950 nautical miles south of Shemya, Alaska April 6, 1993. Washington, D.C: The Board, 1994.

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Hornby, Nick. Slam. London: Penguin, 2010.

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Hornby, Nick. Slam. New York: Riverhead Books, 2007.

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Slam! New York: Scholastic Press, 1996.

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Slot. Brooklyn, USA: Ugly Duckling Presse, 2012.

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Book chapters on the topic "Slat"

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Chen, Peng, Xunnian Wang, and Yuchang Wen. "Modes of Pressure Fluctuations Around a Leading-Edge Slat." In Fluid-Structure-Sound Interactions and Control, 217–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40371-2_32.

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Souza, Daniel S., Daniel Rodríguez, and Marcello A. F. de Medeiros. "Proper Orthogonal Decomposition Analysis of Noise Generation Mechanisms in the Slat Cove." In Fluid Mechanics and Its Applications, 237–42. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06260-0_35.

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Zhou, Haipan, Chunping Zeng, and Guangmin Wu. "Seismic Analysis and Fatigue Life Analysis of Slat-Leg Rigid-Frame Bridge." In AsiaSim 2012, 255–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34387-2_29.

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d’Ippolito, Roberto, Stijn Donders, Luc Hermans, Michael Hack, Joost Van de Peer, and Nick Tzannetakis. "A Fatigue Life Reliability-based Design Optimization of a Slat Track using Mesh Morphing." In III European Conference on Computational Mechanics, 382. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-5370-3_382.

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Rudnik, R., and A. Ronzheimer. "Numerical Investigation of the Flow Around Different Slat Tracks on a Swept High Lift Wing Segment." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 58–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39604-8_8.

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Ortmann, Judith, and Jochen Wild. "Effect of Noise Reducing Modifications of the Slat on Aerodynamic Properties of the High-Lift System." In New Results in Numerical and Experimental Fluid Mechanics V, 357–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_44.

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Hong, Taehoon, Jeongyoon Oh, Kwangbok Jeong, Jimin Kim, and Minhyun Lee. "Establishment of Optimal Control Strategy of Building-Integrated Photovoltaic Blind Slat Angle by Considering Interior Illuminance and Electricity Generation." In Lecture Notes in Computer Science, 451–54. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51469-7_40.

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Dehestani, N., S. Sarkar, Mohammad Reza Ay, M. Sadeghi, and M. Shafaei. "Comparative Assessment of Rotating Slat and Parallel Hole Collimator Performance in GE DST-Xli Gamma Camera: A Monte Carlo Study." In IFMBE Proceedings, 1062–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89208-3_253.

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Furukawa, M., Wei Gao, Hideki Shimizu, S. Kiyono, M. Yasutake, and K. Takahashi. "Three-Dimensional Slit Width Measurement for Long Precision Slot Dies." In Key Engineering Materials, 343–48. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-977-6.343.

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Gonzalez, Miguel Angel Rojas, Peter Chronz, Kuan Lu, Edwin Yaqub, Beatriz Fuentes, Alfonso Castro, Howard Foster, Juan Lambea Rueda, and Augustín Escámez Chimeno. "G-SLAM – The Anatomy of the Generic SLA Manager." In Service Level Agreements for Cloud Computing, 167–86. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-1614-2_11.

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Conference papers on the topic "Slat"

1

Rozler, Mike, and Wei Chang. "A variable-pitch slat stack for task-specific slit-slat collimation: A preliminary report." In 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551803.

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Zhang, Yang, Louis N. Cattafesta, Kyle A. Pascioni, Meelan M. Choudhari, David P. Lockard, Mehdi R. Khorrami, and Travis Turner. "Slat Noise Control Using a Slat Gap Filler." In AIAA AVIATION 2020 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2553.

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Zheng, Xiaofen, and Scott D. Metzler. "Angular viewing time optimization for slit-slat SPECT." In 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551805.

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Zheng, Xiaofen, and Scott D. Metzler. "Adaptive optimization of slit width for a slit-slat collimator." In 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551490.

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Smith, M., L. Chow, and N. Molin. "Attenuation of Slat Trailing Edge Noise Using Slat Gap Acoustic Liners." In 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2666.

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König, Daniel, Seong Koh, Wolfgang Schröder, and Matthias Meinke. "Slat Noise Source Identification." In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-3100.

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Metzler, Scott D., Roberto Accorsi, Ahmet S. Ayan, and Ronald J. Jaszczak. "First Experimental Results from a Prototype Rotating Slit-Slat Collimator." In 2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC). IEEE, 2008. http://dx.doi.org/10.1109/nssmic.2008.4774330.

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Emunds, Rolf, and Markus Fischer. "Effect of Slat Settings (Gap Overlap) on Slat Noise based on a test vortex injected upstream of the SLAT-Hook." In 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2665.

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Kumar, Sushrut, Priyam Gupta, and Raj Kumar Singh. "A Natural Evolution Based Numerical Optimisation Framework to Develop and Enhance Airfoil-Slat Arrangement." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10846.

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Abstract Leading Edge Slats are popularly being put into practice due to their capability to provide a significant increase in the lift generated by the wing airfoil and decrease in the stall. Consequently, their optimum design is critical for increased fuel efficiency and minimized environmental impact. This paper attempts to develop and optimize the Leading-Edge Slat geometry and its orientation with respect to airfoil using Genetic Algorithm. The class of Genetic Algorithm implemented was Invasive Weed Optimization as it showed significant potential in converging design to an optimal solution. For the study, Clark Y was taken as test airfoil. Slats being aerodynamic devices require smooth contoured surfaces without any sharp deformities and accordingly Bézier airfoil parameterization method was used. The design process was initiated by producing an initial population of various profiles (chromosomes). These chromosomes are composed of genes which define and control the shape and orientation of the slat. Control points, Airfoil-Slat offset and relative chord angle were taken as genes for the framework and different profiles were acquired by randomly modifying the genes within a decided design space. To compare individual chromosomes and to evaluate their feasibility, the fitness function was determined using Computational Fluid Dynamics simulations conducted on OpenFOAM. The lift force at a constant angle of attack (AOA) was taken as fitness value. It was assigned to each chromosome and the process was then repeated in a loop for different profiles and the fittest wing slat arrangement was obtained which had an increase in CL by 78% and the stall angle improved to 22°. The framework was found capable of optimizing multi-element airfoil arrangements.
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Tianyu Ma, Rutao Yao, and Yiping Shao. "Determination of geometrical parameters for slit-slat SPECT imaging on MicroPET." In 2007 IEEE Nuclear Science Symposium Conference Record. IEEE, 2007. http://dx.doi.org/10.1109/nssmic.2007.4437063.

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Reports on the topic "Slat"

1

Dietrich, Richard E. China SLAT Plan Template. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1431325.

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Van Geet, Otto D., Ran Fu, Kelsey A. Horowitz, Parthiv Kurup, Sara M. MacAlpine, and Timothy J. Silverman. Analyzing the Energy Performance, Wind Loading, and Costs of Photovoltaic Slat Modules on Commercial Rooftops. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1421779.

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Merzari, Elia. Final CRADA Report - NEAMS Thermal-Fluids Test Stand for Fluoride-Slat Cooled, High Temperature Reactor Development. Office of Scientific and Technical Information (OSTI), March 2019. http://dx.doi.org/10.2172/1608581.

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van Dooren, H. J. C., J. L. Zonderland, K. Blanken, and S. Bokma. Effect of Comfort Slat Mats with and without valves on ammonia emission from dairy housing : case control measurements at Dairy Campus Leeuwarden. Wageningen: Wageningen UR Livestock Research, 2016. http://dx.doi.org/10.18174/417281.

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Warne, Larry K., William A. Johnson, Brian Frederick Zinser, William L. Langston, Rebecca S. Coats, Isak C. Reines, Jeffery Thomas Williams, Lorena I. Basilio, and Kenneth C. Chen. Narrow Slot Algorithm. Office of Scientific and Technical Information (OSTI), April 2020. http://dx.doi.org/10.2172/1615888.

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Taylor, Zachary T. Residential Slab Component Calculations. Office of Scientific and Technical Information (OSTI), December 2018. http://dx.doi.org/10.2172/1488936.

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Behrend, Dirk. GPS Activities at SLAC. Office of Scientific and Technical Information (OSTI), November 2002. http://dx.doi.org/10.2172/808669.

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McDunn, Ruth. Implementing Net.Analysis at SLAC. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/813172.

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Skaritka, John. SLAC Potting Epoxy #2 Formula. Office of Scientific and Technical Information (OSTI), July 2018. http://dx.doi.org/10.2172/1480936.

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Rock, Stephen E. Future Spin Experiments at SLAC. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/812645.

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