We are proudly a Ukrainian website. Our country was attacked by Russian Armed Forces on Feb. 24, 2022.
You can support the Ukrainian Army by following the link: https://u24.gov.ua/.
Even the smallest donation is hugely appreciated!
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Compression effect.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Compression effect":
1
Ma, Wei Hua, and Hong Zhen Kang. "Experimental Study on Compressive Behavior of CFRP Confined Concrete Columns." Advanced Materials Research 446-449 (January 2012): 3725–29. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3725.
Compressive tests of 30 concrete column specimens with three concrete strength grades are carried out in this paper to study ultimate compressive strength of specimens. The specimens are divided into three groups, that is, unconfined, confined by CFRP with no initial compression and confined by CFRP with various initial compressions. The different initial compressions’ influence on ultimate stresses and strains are investigated. The decrease of CFRP reinforcing effect due to pre-compression are analyzed. The research results provide experimental datum for reinforced design of existing concrete columns.
2
Lee, Jae-Min, and Hyeong-Wan Yun. "Effect of Chest Compression Position Depending on the Rescuer’s Hip Joint Angle During Basic CPR." Fire Science and Engineering 34, no. 2 (April 30, 2020): 103–9. http://dx.doi.org/10.7731/kifse.0902eaff.
This study aims to investigate the improvement in basic CPR quality on the basis of the hip joint angle of the rescuer among students in the Department of Emergency Medical Technology who completed a basic CPR curriculum. In this study, we carried out a comparative analysis using SimPad SkillReporter and Resusci Anne® QCPR® to measure the quality of CPR (depth of chest compressions, full relaxation, compression speed, and more) on the basis of the rescuer’s hip joint angle in accordance with the 2015 AHA Guidelines and conducted chest compressions and CPR 5 times in a 30:2 ratio. It was found that maintenance of the rescuer’s hip joint angle at 90 degrees while compressing and relaxing the chest made a statistically significant difference in both the experimental and control groups. Moreover, this indicated that the closer the hip joint angle was to 90 degrees, the better was the quality of basic CPR. However, there was no significant difference in the hip joint angle, degree of CPR, depth of chest compressions, chest compression speed, chest compression and relaxation percentages (%), accuracy of chest compressions, hands-off time during CPR, and percentage of chest compression time (p > 0.05). Maintaining the hip joint angle at 90 degrees for basic CPR was not significantly different from not maintaining this angle. Nonetheless, good results have been obtained at moderate depth and 100% recoil. Therefore, good outcome and high-quality CPR are expected.
3
Liu, Chunlei, Qun Zheng, Qi Wang, Aqiang Lin, Yuting Jiang, and Mingcong Luo. "Sensitivity Analysis of Multistage Compressor Characteristics Under the Spray Atomization Effect Using a CFD Model." Energies 12, no. 2 (January 18, 2019): 301. http://dx.doi.org/10.3390/en12020301.
In this paper, a CFD model is used to simulate the effect of spray atomization at the compressor inlet on a multistage axial subsonic compressor. Special attention is paid to the change of compressor characteristics with wet compression under different rotating speeds to gain the compressor characteristic lines of wet compression. The effects of pneumatic crushing and blade-wall-collision on water droplets and droplet trajectories are contrasted and analyzed under different spray conditions. Then, the whole/stage-by-stage compressor performances and the flow field are also investigated under dry and wet cases near the design operating condition. The results indicate that multistage compressor performance can be improved with wet compression under the proper water spaying rate and a small droplet size. The influence of pneumatic crushing on the water droplets below 20 μm can be ignored, and the effect of blade collision on water droplets above 5μm should be considered in the wet compression conditions. Compared to the dry compression, as measured by volume flow, wet compression with proper spaying conditions makes the front stages operate within a relatively high flow range and the back stages operate within a relatively low flow range. Additionally, the operating state with wet compression is opposite to the compressor operating near the surge boundary, which presents the phenomenon of “former surged and back blocking”.
4
Lee, Sang Eon, and Jung-Wuk Hong. "Effect of Crack Closure on Magnitude of Modulated Wave." International Journal of Structural Stability and Dynamics 20, no. 13 (December 2020): 2041018. http://dx.doi.org/10.1142/s0219455420410187.
Fatigue cracks generated by repeated loads cause structural failures. Such cracks grow continuously and at an increasing speed owing to the concentration of stresses near the crack tips. Therefore, the early detection of fatigue cracks is imperative in the field of structural-health monitoring for the safety of structures exposed to dynamic loading. In particular, the detection of those cracks subjected to compression is known as a challenging problem in the nondestructive inspection area. The nonlinear ultrasonic modulation technique is effective for the detection of microcracks smaller than the size of a wavelength because this technique uses the deformation of waves passing through the crack surfaces. However, the technique has not been thoroughly verified for detecting cracks subjected to external forces. In this study, nonlinear ultrasonic modulation tests are performed on two types of crack specimens under compressive forces. The results show that in fatigue-cracked specimens, the cracks can be detected using modulated waves even under strong compressions. With artificial cracks, buckling occurs at a relatively low compression, and the amounts of modulated waves rapidly increase due to the bending of the specimen before buckling failure takes place. In this study, the crack detection methodology under compression is proposed and experimentally verified. The proposed method might be beneficial to find cracks under compression in various structural components.
5
Shi, Feng Jian, Si Zhen Ye, Lei Gang Wang, and Sheng Lu. "Effect of Friction on Billet Deformation during Multi-Axial Compressions." Advanced Materials Research 143-144 (October 2010): 879–83. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.879.
The effect of friction on compression load, effective strain, damage value and maximum principal stress were analyzed by rigid-plastic finite element method during multi-axial compressions (MAC). The results show that with the number of compressions, the maximum compression load increases gradually, the effective strain distributes ringwise and the maximum effective strain is in the center and the minimum at the surface. The damage is inclined to appear at the barreled shape perpendicular to the longitudinal axis. With the increase of friction coefficient, the maximum compression load, strain inhomogeneity, damage value and maximum principal stress increase under the condition of same number of compression. These results indicate that the friction is adverse during MAC. Appropriate measures should be adopted to decrease the effect of frictional force.
6
Du, Haijun, Yanhua Ma, Ruoyan Li, Ting Lei, and Pei Wu. "Effect of vibrational frequency on alfalfa opening compression process." BioResources 17, no. 4 (October 14, 2022): 6706–17. http://dx.doi.org/10.15376/biores.17.4.6706-6717.
To reveal the action mechanism of vibration frequency in alfalfa opening compression, a self-developed vibration compression test system was used to evaluate the variation of compression force during alfalfa open compression. A faster vibration frequency yielded a smaller compression force required for compressing alfalfa into blocks. Compared with free vibration compression, vibration compression was beneficial to release the internal stress of alfalfa block, reduce the forming pressure, and stabilize the high density. In the range of test vibration frequency, when the frequency was 15 Hz, the residual internal stress release ratio of alfalfa block was the highest, and the stable density of alfalfa block was the largest. Considering the pressure and alfalfa block density comprehensively, the optimized vibration frequency was approximately 15 Hz.
7
HAN, FENGXIA, QING LIU, XIN GUO, MENG ZHANG, and XIA HAN. "ANALYTICAL STUDY ON AXIAL AND ECCENTRIC COMPRESSIVE BEHAVIOR OF POPLAR COLUMN STRENGTHENED BY BFRP." WOOD RESEARCH 67(1) 2022 67, no. 1 (January 16, 2022): 11–25. http://dx.doi.org/10.37763/wr.1336-4561/67.1.1125.
In this work, the compression behaviour of the Xinjiang poplar column was reinforced by basalt fibre reinforced polymer (BFRP) strips with different reinforced configurations, and thenumerical simulations were performed on the axial and eccentric compressions of poplar columns unreinforced and reinforced with BFRP to assess the effect of the bearing capacity and deformation of the columns. The results show that the use of BFRP to reinforce the Xinjiang poplar column effectively improves its axial compressive bearing capacity (axial compression) andbending bearing capacity (eccentric compression), and at the same time, the bearing capacity and stiffness of the columns strengthened by BFRP increased with the bonding area of BFRP.
8
He, Jun Yan, Wan Jie Meng, and Chu Jun Zhao. "Effects of Core Diameter Variation on the Silicon Photonic Nanowire Soliton Effect Compressor." Advanced Materials Research 571 (September 2012): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amr.571.395.
The influences of core diameter variation on silicon photonic nanowire soliton-effect femtosecond pulse compressor at 1550 nm have been numerically analyzed. It is shown that when the core diameter smaller than 355 nm, the compression factor increases and the quality factor and the optimum fiber length decreases with the increasing core diameter; when the core diameter larger than 355 nm, the core diameter has little effect on the optimum fiber length, but the compression factor decreases and the quality factor increases with the increasing core diameter.
9
Sha, Yu, Hui Tang, Xin Song, and Jia Zhen Zhang. "Finite Element Analysis of the Effect of the Compressive Loading on Fatigue Crack Growth under Different Loading." Applied Mechanics and Materials 16-19 (October 2009): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.269.
In this paper, elastic-plastic finite element analysis has been performed in order to obtain the fatigue crack tip parameters under tension-compression loading. Two centre-cracked high-strength aluminum alloy with a crack length of 2mm under different tension-compression loading are analyzed. The analysis shows that the compressive loading has a significant contribution towards the crack tip plasticity and the crack tip stress. In a tension-compression loading the crack tip displacement increases with the increase of the compressive stress and the crack tip compress stress increases with the increase of the compressive stress. The maximum stress intensity Kmax in the tension part of the stress cycle and the maximum compressive stress in the compression part of the stress cycle are the main factors controlling the near crack tip parameters.
10
Jee, Yong Ju, and Stephen R. Swanson. "Effect of State of Stress on Compression Failure in Carbon/Epoxy Laminates." Journal of Engineering Materials and Technology 117, no. 3 (July 1, 1995): 347–50. http://dx.doi.org/10.1115/1.2804550.
Compression loadings in thick composites can in some cases lead to three-dimensional states of stress with a compressive mean stress. A model is developed in the present work that attempts to incorporate this compressive mean stress into a prediction for compression strength of carbon/epoxy fiber composites. The model assumes that the fibers have an initial misalignment, and that composite failure occurs when the fiber-matrix bond strength is exceeded. Literature values for the effect of pressure on bond strength are included. Comparisons with experimental data support the predicted increase in compression strength with pressure.
Dissertations / Theses on the topic "Compression effect":
1
Alkharabsheh, Khaled S. "Image compression and its effect on data." Huntington, WV : [Marshall University Libraries], 2004. http://www.marshall.edu/etd/descript.asp?ref=462.
Gan, Khong Wui. "Effect of high through-thickness compression on composite failure." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616885.
As composite materials are now used in load conditions with increasing complexity and thickness, all the three-dimensional stress components become important and should be taken into account when predicting failures. In particular, the through-thickness stresses can play a crucial role in determining the in-plane behaviours and strength of a composite, laminate. The work presented in this PhD thesis aims to investigate failures due to complex stress fields at the root of a composite component in a dovetail assembly, where highly concentrated through-thickness stresses as well as in-plane tensile and interlaminar shear stresses are present. The problem was decoupled into two simpler multiaxial load cases which were studied separately: (1) through-thickness compression with interlaminar shear, and (2) through-thickness compression with longitudinal tension. They were investigated experimentally using new loading configuration in a biaxial test machine. This bridges the gap in reliable multiaxial experimental data which is lacking in the open literature. This was then combined with a finite element (FE) modelling approach to, develop simple failure criteria which are validated for engineering design purposes. A simple constitutive law which takes into account the effect of transverse compression and analytical tools which can be I easily utilised to predict stresses and failures in composites were also developed. The findings of this thesis were finally applied to a severely tapered dovetail composite specimen, together with some mitigation strategies, to predict its ultimate fibre failure load and the failure locations.
3
Ragan, Paula Marie. "The effect of mechanical compression on chondrocyte gene expression." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85347.
Thesis (Ph.D.)--Harvard--Massachusetts Institute of Technology Division of Health Sciences and Technology, 1999. Includes bibliographical references (leaves 115-122). by Paula M. Ragan. Ph.D.
4
Talal, Sina. "Effect of long-term compression on rigid polymer foams." Thesis, Kingston University, 1999. http://eprints.kingston.ac.uk/20640/.
The sponsors of this project have been using the rigid heavily-crosslinked polyurethane foam detailed in this study for load-bearing applications. One of the main requirements of this material is that it must possess excellent recovery properties following extensive compressive periods over several years. For such long loading regimes, there is need for detailed understanding of the compressive behaviour of this material, and its subsequent recovery upon release. More recently, there has been a growing interest in replacing the polyurethane foam with an alternative cellular plastic that possesses similar, if not identical, compressive recovery and behaviour. Attention was focused on the other primary polymer contingent, a polyethylene foam. A polyimide foam was also considered as it was already being used in applications similar to those of the polyurethane foam. The structures of the foams were investigated by means of Differential Scanning Calorimetry, Scanning Electron Microscopy and Image Analysis. The deformation mechanisms that occur during the application of a compressive force were examined visually via a scanning electron microscope compression rig. The mechanical analysis involved stress-strain testing whereby three stages of compression were identified (‘linear elastic, stress plateau and densification’), as described in the literature. Quadratic relationships were found to exist between the foam density and the ‘elastic modulus, plateau modulus and the compressive strength’ respectively. Such relationships had previously been found to exist in the literature, but not for the rigid variety of foam at such a broad range of densities. Further analysis included a detailed study of the recovery of the polyurethane (100 kg m[sup]-3 to 800 kg m[sup]-3) foams, a lightly-crosslinked polyethylene foam and a non-crosslinked polyimide foam. The foam samples were compressed by strains which spanned their linear elastic and stress plateau regimes i.e. by 2.5% to 35% for periods ranging from 3 days up to one year at ambient temperature. This analysis was also undertaken at elevated temperature as a means of accelerating the ageing process. Recovery of all of the samples was monitored for a minimum of 100 days at ambient temperature following release. Recovery of all of the foams tested was found to occur in two stages; an initial rapid recovery within the first day following release followed by a much slower recovery phase over a period of approximately 100 days. The initial rapid recovery was attributed to the recovery of the bulk polymer whilst the recovery of the cellular structure was associated with the ensuing slower recovery phase. In addition, recovery of the foams was found to be dependent more upon the compressive strain than on other parameters, such as compressive period and foam density. For compressive periods exceeding two weeks, recovery is almost independent of the latter parameters.
5
Thorp, George. "The Effect of Compression Recovery Pants on Cycling Performance." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430470588.
Comstedt, Erik. "Effect of additional compression features on h.264 surveillance video." Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-30901.
In video surveillance business, a recurring topic of discussion is quality versus data usage. A higher quality allows for more details to be captured at the cost of a higher bit rate, and for cameras monitoring events 24 hours a day, limiting data usage can quickly become a factor to consider. The purpose of this thesis has been to apply additional compression features to a h.264 video steam, and evaluate their effects on the videos overall quality. Using a surveillance camera, recordings of video streams were obtained. These recordings had constant GOP and frame rates. By breaking down one of these videos to an image sequence, it was possible to encode the image sequence into video streams with variable GOP/FPS using the software Ffmpeg. Additionally a user test was performed on these video streams, following the DSCQS standard from the ITU-R recom- mendation. The participants had to subjectively determine the quality of video streams. The results from the these tests showed that the participants did not no- tice any considerable difference in quality between the normal videos and the videos with variable GOP/FPS. Based of these results, the thesis has shown that that additional compression features can be applied to h.264 surveillance streams, without having a substantial effect on the video streams overall quality.
7
Waizmann, Tabea. "The effect of compression and expansion on stochastic reaction networks." Thesis, IMT Alti Studi Lucca, 2021. http://e-theses.imtlucca.it/335/1/Waizmann_phdthesis.pdf.
Markov chains are a fundamental model to study systems
with stochastic behavior. However, their state space is often
of an unmanageable size, making the use of approximations
and simplifications necessary for analytic solutions. This thesis
considers reaction networks as a well-known representation
for Markov chains describing interactions between species
populations. It presents several methods using model transformations
to aid with the effective analysis of such systems.
Species equivalence is a reduction technique that lifts the concept
(and related algorithms) of Markov chain lumpability
from lumping of states to directly lumping species in a reaction
network. This allows the simplification of a reaction
network without first examining its state space.
The tool DiffLQN implements a method for the analysis of
large-scale stochastic models for the performance evaluation
of software systems using an approach based on deterministic
rate equations, by means of a compact system of ordinary
differential equations that approximate only mean estimates
for stochastic reaction networks.
Deterministic rate equations are generally accurate for networks
with large populations, but may incur errors when elements
are only present in low copy numbers. This thesis
presents finite state expansion, which aims to solve that problem.
It does so by converting a given reaction network into
an expanded one with additional species and reactions such
that the overall stochastic behavior is preserved. The resulting
rate equations, however, may enjoy increased accuracy.
Several tests on example models show that finite state expansion
proves competitive with other state-of-the-art methods.
8
Ndebele, Nothando Elizabeth. "Clustering algorithms and their effect on edge preservation in image compression." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1008210.
Image compression aims to reduce the amount of data that is stored or transmitted for images. One technique that may be used to this end is vector quantization. Vectors may be used to represent images. Vector quantization reduces the number of vectors required for an image by representing a cluster of similar vectors by one typical vector that is part of a set of vectors referred to as the code book. For compression, for each image vector, only the closest codebook vector is stored or transmitted. For reconstruction, the image vectors are again replaced by the the closest codebook vectors. Hence vector quantization is a lossy compression technique and the quality of the reconstructed image depends strongly on the quality of the codebook. The design of the codebook is therefore an important part of the process. In this thesis we examine three clustering algorithms which can be used for codebook design in image compression: c-means (CM), fuzzy c-means (FCM) and learning vector quantization (LVQ). We give a description of these algorithms and their application to codebook design. Edges are an important part of the visual information contained in an image. It is essential therefore to use codebooks which allow an accurate representation of the edges. One of the shortcomings of using vector quantization is poor edge representation. We therefore carry out experiments using these algorithms to compare their edge preserving qualities. We also investigate the combination of these algorithms with classified vector quantization (CVQ) and the replication method (RM). Both these methods have been suggested as methods for improving edge representation. We use a cross validation approach to estimate the mean squared error to measure the performance of each of the algorithms and the edge preserving methods. The results reflect that the edges are less accurately represented than the non - edge areas when using CM, FCM and LVQ. The advantage of using CVQ is that the time taken for code book design is reduced particularly for CM and FCM. RM is found to be effective where the codebook is trained using a set that has larger proportions of edges than the test set.
9
Shi, Lu-Feng. "Effect of dynamic compression characteristics on aided perception of reverberant speech." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.
McDonald, G. J. "Optical sampling and metrology using a soliton-effect compression pulse source." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19219/.
A low jitter optical pulse source for applications including optical sampling and optical metrology was modelled and then experimentally implemented using photonic components. Dispersion and non-linear fibre effects were utilised to compress a periodic optical waveform to generate pulses of the order of 10 picoseconds duration, via soliton-effect compression. Attractive features of this pulse source include electronically tuneable repetition rates greater than 1.5 GHz, ultra-short pulse duration (10-15 ps), and low timing jitter as measured by both harmonic analysis and single-sideband (SSB) phase noise measurements. The experimental implementation of the modelled compression scheme is discussed, including the successful removal of stimulated Brillouin scattering (SBS) through linewidth broadening by injection dithering or phase modulation. Timing jitter analysis identifies many unwanted artefacts generated by the SBS suppression methods, hence an experimental arrangement is devised (and was subsequently patented) which ensures that there are no phase modulation spikes present on the SSB phase noise spectrum over the offset range of interest for optical sampling applications, 10Hz-Nyquist. It is believed that this is the first detailed timing jitter study of a soliton-effect compression scheme. The soliton-effect compression pulses are then used to perform what is believed to be the first demonstration of optical sampling using this type of pulse source. The pulse source was also optimised for use in a novel optical metrology (range finding) system, which is being developed and patented under European Space Agency funding as an enabling technology for formation flying satellite missions. This new approach to optical metrology, known as Scanning Interferometric Pulse Overlap Detection (SIPOD), is based on scanning the optical pulse repetition rate to find the specific frequencies which allow the return pulses from the outlying satellite, i.e. the measurement arm, to overlap exactly with a reference pulse set on the hub satellite. By superimposing a low frequency phase modulation onto the optical pulse train, it is possible to detect the pulse overlap condition using conventional heterodyne detection. By rapidly scanning the pulse repetition rate to find two frequencies which provide the overlapping pulse condition, high precision optical pulses can be used to provide high resolution unambiguous range information, using only relatively simple electronic detection circuitry. SIPOD’s maximum longitudinal range measurement is limited only by the coherence length of the laser, which can be many tens of kilometres. Range measurements have been made to better than 10 microns resolution over extended duration trial periods, at measurement update rates of up to 470 Hz. This system is currently scheduled to fly on ESA’s PROBA-3 mission in 2012 to measure the intersatellite spacing for a two satellite coronagraph instrument. In summary, this thesis is believed to present three novel areas of research: the first detailed jitter characterisation of a soliton-effect compression source, the first optical sampling using such a compression source, and a novel optical metrology range finding system, known as SIPOD, which utilises the tuneable repetition rate and highly stable nature of the compression source pulses.
A, Schowengerdt Robert, and Research Institute for Advanced Computer Science (U.S.), eds. The effect of lossy image compression on image classification. [Moffett Field, Calif.]: Research Institute for Advanced Computer Science, NASA Ames Research Center, 1995.
E, Perez-Davis Marla, and United States. National Aeronautics and Space Administration., eds. The effect of compression on individual pressure vessel nickel/hydrogen components. [Washington, DC]: National Aeronautics and Space Administration, 1988.
Lafferty, Ian. The effect of crystallisation variables on the powder characteristics, mechanical properties and compression behaviour of dextrose. Leicester: De Montfort University, 1998.
Joshi, K. D. Development velocity interferometer system for any reflector for measurement of mechanical properties of materials during high strain rate compression and decompression process. Mumbai: Bhabha Atomic Research Centre, 2011.
United States. National Aeronautics and Space Administration., ed. The effects of compressive preloads on the compression-after-impact strength of carbon/epoxy. [Washington, D.C: National Aeronautics and Space Administration, 1994.
G, Lance D., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. The effects of compressive preloads on the compression-after-impact strength of carbon/epoxy. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.
United States. National Aeronautics and Space Administration., ed. The effects of compressive preloads on the compression-after-impact strength of carbon/epoxy. [Washington, D.C: National Aeronautics and Space Administration, 1994.
Mortensen, Jonathan, Jia Jie Wu, Jacob Furst, John Rogers, and Daniela Raicu. "Effect of Image Linearization on Normalized Compression Distance." In Communications in Computer and Information Science, 106–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10546-3_14.
Khoa, Nguyen Xuan, Yanuandri Putrasari, Dinh Nam Vu, Nguyen Ho Xuan Duy, and Ocktaeck Lim. "The Effect of Control Strategies on the Gasoline Compression Ignition (GCI) Engine: Injection Strategy, Exhaust Residual Gas Strategy, Biodiesel Addition Strategy, and Oxygen Content Strategy." In Gasoline Compression Ignition Technology, 27–71. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8735-8_3.
Unterweger, Andreas, Dominik Engel, and Martin Ringwelski. "The Effect of Data Granularity on Load Data Compression." In Energy Informatics, 69–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25876-8_7.
Foster, Mark A., Qiang Cao, Rick Trebino, and Alexander L. Gaeta. "Soliton-effect pulse compression of supercontinuum in photonic nanowires." In Ultrafast Phenomena XV, 86–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_28.
Reddy, A. Narender, and T. Meena. "The Effect of Alccofine on Blended Concrete Under Compression." In Lecture Notes on Multidisciplinary Industrial Engineering, 27–37. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7968-0_3.
Yan, Yuxiu, Xuan Li, Ke Liu, Zimin Jin, and Jing Jin. "Effect of Tight-Fitting Sportswear Compression on Sports Fatigue." In Man-Machine-Environment System Engineering, 383–91. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2481-9_44.
France, Stephen, and Douglas Carroll. "Is the Distance Compression Effect Overstated? Some Theory and Experimentation." In Machine Learning and Data Mining in Pattern Recognition, 280–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03070-3_21.
Wang, Dongxing, Linfeng Wu, Xiangyun Gao, Yiying Du, and Shengjie Di. "Effect of Remoulding on Compression Behaviour of Cement Stabilized Clays." In Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours, 290–98. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0125-4_32.
Andresen, L., and H. P. Jostad. "Effect of Strain-Softening in Interpretation of Laboratory Compression Tests." In Application of Numerical Methods to Geotechnical Problems, 223–32. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-2512-0_21.
Li, Ying, Dong Wang, Linbing Wang, Lei Zhang, and Xudong Wang. "Effect of Film Thickness of Asphalt Mixture in Compression Test." In RILEM Bookseries, 199–218. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6878-9_15.
Conference papers on the topic "Compression effect":
1
Simons, Sarah, Ryan Cater, Klaus Brun, Grant Musgrove, and Rainer Kurz. "Measured Thermodynamic Effect of Wet Gas Compression." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75058.
Significant work has been performed to qualify and quantify the effects of operating with wet gas in a centrifugal compressor system [1, 2]. Of particular interest is the sharp decrease in the isentropic efficiency of the machine when operating with process gas containing various liquid volume fractions. However, it is unknown how much of the performance losses are due to aerodynamic effects, such as blade profile and flow separation losses, rather than the basic thermodynamic effects of compressing a multiphase gas that has a higher density, integral wet-cooling, and contains small amounts of high-density droplets. Previous studies showed that the overall efficiency losses exceeded those expected from purely thermodynamic effects so aerodynamic effects have been principally blamed for the lower efficiency. However, no test data exists in the public domain that quantifies these losses and it is experimentally difficult to perform this type of testing in centrifugal compressor. Therefore, a series of tests was performed on a reciprocating compressor with power and efficiency recorded through dynamic pressure measurements obtained inside the compression cylinder, torque measured on the shaft, and enthalpy rise measurements obtained outside the cylinders. Using this approach one can eliminate (or differentiate) the aerodynamic effects of wet gas compression, such as valve losses, thus allowing the direct determination of the thermodynamic losses of wet gas compression. Specifically, when there is multi-phase flow entering the machinery, there is the thermodynamic effect of how a mixture of water and air behaves when being compressed [from a process perspective] and the aerodynamic effect of moisture encountering the blades of a centrifugal compressor [performance loss] or the valve passages of a reciprocating compressor [pressure loss]. Directly instrumenting the internals of a reciprocating compressor cylinder allows the evaluation of the thermodynamic performance of multi-phase compression separate from any aerodynamic penalties. This paper describes the tests performed in a reciprocating compressor open test loop operating with varying amounts of liquid volume fractions (LVFs) of water in the process gas (air). The data was reduced using Pressure-Volume card measurements inside and outside the cylinder, enthalpy rise, as well as torque to determine the impact of volume fraction on compression power and efficiency. Additionally, the valve losses, system efficiencies, and peak compression “spike” were evaluated in relations to the LVFs.
2
Fritz, J. N. "The isotope effect on the Hugoniot of polyethylene." In Shock compression of condensed matter. AIP, 2000. http://dx.doi.org/10.1063/1.1303442.
The size effect in the structural strength of fiber reinforced composites has been typically analyzed for tensile failures. However, this is not true for the equally important compressive failures, primarily due to the difficulties in conducting compression tests on specimens of multiple sizes. These size effects are analyzed here numerically for two important compressive failure mechanisms in composites, viz. (i) fiber kink bands forming under longitudinal compression (typically accompanied by axial splitting matrix cracks) and (ii) inclined shear cracks forming under transverse compression. The former mechanism is modeled by a semi-multiscale microplane model, while the latter by the fixed crack model. Both models are calibrated and verified using available test data on carbon fiber composites and then used to predict the failure and load bearing capacities of geometrically scaled pre-cracked specimens of different sizes. In all cases, the predicted failure is found to be of a propagating nature, accompanied by release of strain energy from the specimen causing a distinct size effect in the nominal strength. For the composite considered here, under longitudinal compression, the fracture process zone (FPZ) is found to be fairly small (<1 mm) and the strength size effect is seen to follow linear elastic fracture mechanics (LEFM). The size effect deviates from LEFM for smaller specimen sizes due to increased flaw size insensitivity but cannot be fitted by Bažant's size effect law since the geometric similarity of the failure mode is lost. On the other hand, under transverse compression the FPZ is found to be much larger (34 to 42 mm) and the size effect is found to obey Bažant's size effect law, deviating from LEFM. The failure is geometrically similar despite being inclined to the pre-crack. These findings provide evidence of the general applicability of fracture mechanics-based size effect laws to compressive failure in fiber composites, and prompt suitable experimental investigations.
5
Provine, Joseph A., and Rangaraj M. Rangayyan. "Effect of peanoscanning on image compression." In Optical Engineering and Photonics in Aerospace Sensing, edited by Friedrich O. Huck and Richard D. Juday. SPIE, 1993. http://dx.doi.org/10.1117/12.150946.
Abbe, Emmanuel. "Graph compression: The effect of clusters." In 2016 54th Annual Allerton Conference on Communication, Control, and Computing (Allerton). IEEE, 2016. http://dx.doi.org/10.1109/allerton.2016.7852203.
Hung, Jung-Chung, Yu-Chung Tsai, and Chinghua Hung. "The Effect of Ultrasonic-Vibration on Upsetting." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95442.
Ultrasonic-vibration upsetting is a process in which a cylindrical specimen is compressed by an axial force while the ultrasonic vibration is simultaneously applied to the die. Homogenous deformation is difficult to achieve during this process because of the friction at the interface between the specimen and the die. An extrapolated compression test was performed in this study on aluminum alloy specimens to explore the effect of superimposing ultrasonic-vibration during upsetting. Experimental results indicate that ultrasonic-vibration reduced the compressive force when the friction was eliminated by the extrapolated compression test. The specimen size also influences the force-reducing effects of ultrasonic-vibration. The decrease in the compressive force is smaller for a larger specimen. The barreling profile of the specimen after test indicates that the interface friction will increase during ultrasonic-vibration compression. Additionally, the raised material temperatures are caused by ultrasonic-vibration. Experimental results of the hot extrapolated compression test and the hot ring compression test indicate that the drop in the flow stress and the increase in the interface friction are caused by the increase in the temperature of the material under ultrasonic vibration.
8
Von Deschwanden, Inez, Stefan Braun, and Dieter Brillert. "Effect of Interstage Injection on Compressor Flow Characteristic." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4959.
Abstract Wet compression is a widely used approach to enhance the compressor performance of gas turbine units. For wet compression, a water-spray consisting of tiny droplets is injected into the air inlet duct of the compressor. A multi-phase flow of humid air and water droplets enters the compressor. The continued water evaporation inside the compressor stages causes further cooling during the compression process. Water injection between the compressor stages is called interstage injection. An advantage of interstage injection compared to wet compression is the optimized injection of water at specific positions inside the compressor. The amount of injected water can be adopted to the specific operating conditions of the different injection positions with the ideal of isothermal compression. Interstage injection can be realized by several techniques. This paper focuses on interstage injection of water from the trailing edge of stator blades. The water spray is generated in the complex wake flow of the airfoil. This leads to strong interaction between the water spray and the carrier gas flow. In this paper, especially the impact of water injection on the air flow and the spread of the spray is investigated. Phase Doppler Anemometry (PDA) measurements enable two dimensional velocity measurements linked with the droplet size. The comparison of PDA measurements and Computational Fluid Dynamic (CFD) calculations of the dry gas flow allows for the identification of flow instabilities due to interstage injection. Within this publication, a significant influence of the water injection from the trailing edge on the carrier flow is identified. Furthermore, the ability of the spray to spread widely into the flow demonstrates that water injection from the trailing edge is a promising technique for interstage injection.
9
Anwar, Taha, Rocky Taylor, and Jungyong Wang. "Effect of Axial Compression on Flexural Strength of Freshwater Ice." In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-104638.
Abstract In the design of bridges, wind turbine towers, offshore structures and ice-class ships for operations in ice-prone regions, sloped structures may be employed to promote flexural failure of level ice to reduce loads on the structure. During such interactions, the ice sheet does not fail in pure bending since a component of the applied force at the sloped interface results in an axial load that induces a compressive stress in the ice. The net effect of this axial component is that the corresponding compressive stresses balance with flexure-induced tensile stresses in the outmost fibres of the ice. As a result, the apparent flexural strength of the ice is expected to increase with increasing axial compression, since larger bending forces would be required to generate sufficient tension to trigger fracture. In ice load prediction models for sloped structures, an in-plane compression (IPC) factor is applied to calculated loads to account for increased flexural strength which is empirically determined to be 1.5. While the method of superposition may be used to assess combined loading effects for elastic structures, assessing such effects in ice is more complex since the behaviour of ice is not purely elastic. In this paper, the relationship between axial compression and the flexural strength of freshwater ice is studied experimentally to assess how the flexural failure behaviour of the ice changes for different levels of in-plane compression factor. A series of experiments on freshwater ice have been conducted for compression levels at 75%, 135% and 185% of unconfined flexural strength for ram speeds of 0.1 mm/s, 1.0 mm/s and 10.0 mm/s. These results indicate that in-plane compression significantly increases the apparent flexural strength of the ice, highlighting the need for further work in this area to better understand this phenomenon and assess implications for design. This new testing approach provides a promising direction for further examination of these important effects, including extending this work to the analysis to sea ice and to consider lower IPC values.
10
Agrawal, Govind P. "Effect of intrapulse Raman scattering on soliton-effect pulse compression." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mo6.
Optical fibers can be used for pulse compression in the wavelength region of anomalous group-velocity dispersion by exploiting the periodic evolution of the higher-order solitons which undergo an initial pulse-narrowing stage. By choosing the fiber length judiciously, the pulse is made to exit out of the fiber when it is narrowest. The optimum fiber length and the compression factor are obtained by solving the nonlinear Schrodinger equation (NSE).1 The predictions of the NSE are accurate for picosecond pulses but need modification for femtosecond input pulses as several higher-order nonlinear effects become important for such short pulses. The most important among them is intrapulse stimulated Raman scattering, a phenomenon responsible for the soliton self-frequency shift and soliton decay. In this paper, we study numerically the effect of intrapulse Raman scattering on soliton-effect pulse compression by solving the generalized NSE. Even though the pulse evolution is no longer periodic, the input pulse is compressed significantly at an optimum fiber length. The compression factor is larger than that occurring without the Raman effect. Furthermore, the compressed pulse is generally pedestal-free.
Reports on the topic "Compression effect":
1
Donohue, Marc, Gregory Aranovich, Chao Wang, and Pengfei Xie. Effect of Adsorption Compression on Catalytic Chemical Reactions. Final Report. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1430495.
Schembri, Philip Edward, Antranik Antonio Siranosian, and Lance Allen Kingston. Hypothesis to Explain the Size Effect Observed in APO-BMI Compression Tests. Office of Scientific and Technical Information (OSTI), January 2015. http://dx.doi.org/10.2172/1167240.
Hoppel, Christopher P., and Steven J. De Teresa. Effect of an Angle-Ply Orientation on Compression Strength of Composite Laminates. Fort Belvoir, VA: Defense Technical Information Center, June 1999. http://dx.doi.org/10.21236/ada368034.
Watson, Craig, and Charles Wilson. Effect of image size and compression on one-to-one fingerprint matching. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ir.7201.
Lu, Wei, Jiong Li, Ye Tian, and Xingang Lu. Effect of ischemic compression on myofascial pain syndrome: a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2022. http://dx.doi.org/10.37766/inplasy2022.4.0066.
Wu, Fan, Zhi-hui Huang, Bin Xu, Dawei Sang, Zhi-gang Li, and De Liang. Extrapedicular vs transpedicular percutaneous kyphoplasty for osteoporotic vertebral compression fractures. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2023. http://dx.doi.org/10.37766/inplasy2023.3.0048.
Review question / Objective: To assess the efficacy and safety of the two approaches as a treatment for patients with OVCF. Condition being studied: Osteoporotic Vertebral Compression Fractures(OVCFs) is one of the most common health problems in the elderly population. Percutaneous kyphoplasty is a minimally invasive technique that has gained widespread recognition. Transpedicular and extrapedicular are two approaches for kyphoplasty. But over the last decade, the safety and effect of two approaches remain unclear, and there is still a lack if evaluation of their therapeutic effects. Information sources: We searched CENTRAL; MEDLINE; EMBASE; Chinese Biological Medicine Database; VIP Journals Database; Wan-fang database, CNKI; and Chinese Evidence-Based Medicine Database from the their inception to December 2020. The search terms used were: the transpedicular approach and extrapedicular approach for treating OVCF in both English and Chinese. We also searched our own files manually for relevant articles. We hand searched Chinese language journals and conference proceedings. We included dissertations and abstracts, provided they contained sufficient detail for critical evaluation.
7
Gorman, Jhana, Jason Dean Hales, and Edmundo Corona. Effect of shell drilling stiffness on response calculations of rectangular plates and tubes of rectangular cross-section under compression. Office of Scientific and Technical Information (OSTI), May 2010. http://dx.doi.org/10.2172/983668.
Mataya, M. C., and V. E. Sackschewsky. Effect of internal heating during hot compression testing on the stress-strain behavior and hot working characteristics of Alloy 304L. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10158815.
Asenath-Smith, Emily, Ross Lieblappen, Susan Taylor, Reed Winter, Terry Melendy, Robert Moser, and Robert Haehnel. Observation of crack arrest in ice by high aspect ratio particles during uniaxial compression. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43145.
In nature, ice frequently contains dissolved solutes or entrapped particles, which modify the microstructure and mechanical properties of ice. Seeking to understand the effect of particle shape and geometry on the mechanical properties of ice, we performed experiments on ice containing 15 wt% silica spheres or rods. Unique to this work was the use of 3-D microstructural imaging in a -10ºC cold room during compressive loading of the sample. The silica particles were present in the ice microstructure as randomly dispersed aggregates within grains and at grain boundaries. While cracks originated in particle-free regions in both sphere- and rod-containing samples, the propagation of cracks was quite different in each type of sample. Cracks propagated uninhibited through aggregates of spherical particles but were observed to arrest at and propagate around aggregates of rods. These results imply that spherical particles do not inhibit grain boundary sliding or increase viscous drag. On the other hand, silica rods were found to span grains, thereby pinning together the microstructure of ice during loading. These results provide insights into mechanisms that can be leveraged to strengthen ice.
10
Feng, Ningning, Jianbin Guan, Xing Yu, Wenhao Li, Tao Liu, Guozheng Jiang, Kaitan Yang, Yongdong Yang, and He Zhao. Jintiange Capsule May Have a Positive Effect in OVCF Patients with percutaneous vertebral augmentation: A Meta-Analysis of Randomized Trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, September 2022. http://dx.doi.org/10.37766/inplasy2022.9.0038.
Review question / Objective: We aimed to conduct a meta-analysis of the effects of JTG capsules on patients with OVCF underwent PVA surgery, focusing on clinical outcomes and drug safety. Condition being studied: This meta-analysis aims to systematic evaluation of clinical efficacy and adverse effects of JTG with PVA in the treatment of osteoporotic vertebral compression fracture (OVCF).Our current evidence suggests that JTG capsule may relieve pain in OVCF patients who underwent PVA surgery, improve functional activity, and increase BMD, particularly in patients under the age of 70, as well as increase BGP levels.However, considering the unsatisfactory quality of the included trials, more high-quality trials are needed to prove this issue.
