1,291 research outputs found
Twitter Tweets for Donald J. Trump (@realdonaldtrump)
No full textDataset Metrics
Total size of data uncompressed:115901693 bytes
Number of objects (submissions): 40,241
Start Date: Mon May 04 18:54:25 +0000 2009
End Date: Thu Jul 11 15:52:19 +0000 2019
Format: ndjson (new line delimited JSON)
Overview
This dataset contains all known publicly available tweets for Donald J. Trump's (@realdonaldtrump) Twitter account.
Methodology
This data was compiled from multiple sources including several online Github accounts that contained the status ids for previous tweets made by Donald Trump. All ids were compiled into a single list and then those ids were requested from Twitter's "statuses lookup" endpoint. Tweets deleted by Donald Trump will not be in this dataset but can be obtained from the author of this publication for a subset of the time range present in this dataset. This dataset will also include the tweet information for any retweeted tweets under the "retweeted_status" key for each JSON object. The user object has been left in each tweet (both the main tweet and retweeted / quoted tweets if they exist).
Contact
If you have any questions about the data or require more details on the methodology, you are welcome to contact the author
Twitter Tweets for Donald J. Trump (@realdonaldtrump)
No full textDataset Metrics
Total size of data uncompressed:115901693 bytes
Number of objects (submissions): 40,241
Start Date: Mon May 04 18:54:25 +0000 2009
End Date: Thu Jul 11 15:52:19 +0000 2019
Format: ndjson (new line delimited JSON)
Overview
This dataset contains all known publicly available tweets for Donald J. Trump's (@realdonaldtrump) Twitter account.
Methodology
This data was compiled from multiple sources including several online Github accounts that contained the status ids for previous tweets made by Donald Trump. All ids were compiled into a single list and then those ids were requested from Twitter's "statuses lookup" endpoint. Tweets deleted by Donald Trump will not be in this dataset but can be obtained from the author of this publication for a subset of the time range present in this dataset. This dataset will also include the tweet information for any retweeted tweets under the "retweeted_status" key for each JSON object. The user object has been left in each tweet (both the main tweet and retweeted / quoted tweets if they exist).
Contact
If you have any questions about the data or require more details on the methodology, you are welcome to contact the author
Micropolitan areas: splitting the difference
Get PDFby Jason J. Yohannan.Title from PDF caption (viewed on February 24, 2020).Converted from HTML.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Landslide risk reduction in Wasco County, Oregon
No full textby William J. Burns, Nancy Calhoun, Jon Franczyk, Jason D. McClaughry, and Katherine Daniel.Title from PDF cover (viewed on February 27, 2023).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 20-24).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Robust estimation in structural equation models using Bregman and other divergences with t-centre approach to estimate the covariance matrix
Get PDFStructural equation models seek to find causal relationships between latent variables by analysing the mean and the covariance matrix of some observable indicators of the latent variables. Under a multivariate normality assumption on the distribution of the latent variables and of the errors, maximum likelihood estimators are asymptotically efficient. The estimators are significantly influenced by violation of the normality assumption and hence there is a need to robustify the inference procedures. Previous work minimized the von Neuman divergence or its variant the total von Neumann divergence to estimate the parameters, with the minimum covariance determinant used as a robust estimator of the covariance matrix. We extend this approach by considering other divergences and by developing a robust estimate of the covariance matrix. The robust estimator of the covariance matrix developed is a t-centre like estimator based on several minimum covariance determinant estimators ranging from 0% contamination to 50% contamination. The simulation results are promising. The results can be used for robustifying the fit of structural equation models.
References K. A. Bollen. Structural equations with latent variables. Wiley, New York, 1989. http://au.wiley.com/WileyCDA/WileyTitle/productCd-0471011711.html R. W. Butler, P. L. Davies and M. Jhun. Asymptotics for the minimum covariance determinant estimator. Ann. Stat., 21(3):1385–1400, 1993. http://www.jstor.org/stable/2242201 N. J. Higham. Functions of matrices: Theory and computation. SIAM, Philadelphia, 2008. doi:10.1137/1.9780898717778 S. Jayasumana, R. Hartley, M. Salzmann, H. Li and M. Harandi. Kernel methods on the Riemannian manifold of symmetric positive definite matrices. Proc. CVPR IEEE 2013, 73–80, 2013. doi:10.1109/CVPR.2013.17 S. Penev and T. Prvan. Robust estimation in structural equation models using Bregman divergences. CTAC2012, ANZIAM J., 54:C574–C589, 2013. http://journal.austms.org.au/ojs/index.php/ANZIAMJ/article/view/6306 B. C. Vemuri, M. Liu, S.-I. Amari, and F. Nielsen. Total Bregman divergence and its applications to DTI analysis. IEEE T. Med. Imaging., 30(2):475–483, 2011. doi:10.1109/TMI.2010.2086464 S. Verboven and M. Hubert. LIBRA: a MATLAB library for robust analysis, Chemometr. Intell. Lab., 75(2):127–136, 2005. doi:10.1016/j.chemolab.2004.06.00
Properties of reaction fronts in a non-adiabatic two stage exothermic-endothermic competitive reaction scheme
Get PDFWe numerically derive the properties of reaction fronts arising in a pre-mixed one dimensional two staged non-adiabatic competitive exothermic-endothermic reaction scheme where both reaction pathways compete for the same fuel. We utilise FlexPDE and the method of lines to obtain numerical solutions for properties such as the front speed and stability over a range of parameter values such as the Lewis number and the ratios of enthalpies and activation energies. Steady and pulsating speeds are demonstrated for specific regions of the parameter space. We also show that in some circumstances there exists a chaotic regime of combustion wave propagation.
References M. J. Antal and G. Varhegyi, Cellulose Pyrolysis Kinetics - The Current State of Knowledge, Industrial and Engineering Chemistry Research, 34(3):703–717, 1995 doi:10.1021/ie00042a001 R. Ball, A. C. McIntosh and J. Brindley, Thermokinetic Models for Simultaneous Reactions: a Comparative Study, Combustion Theory and Modelling, 3(3):447–468, 1999. doi:10.1088/1364-7830/3/3/302 S. K. Chan and R. Turcotte, Onset Temperatures in Hot Wire Ignition of AN-Based Emulsions, Propellants Explosives Pyrotechnics, 34(1):41–49, 2009. doi:10.1002/prep.200700288 FlexPDE, PDE Solutions Inc, http://www.pdesolutions.com. V. V. Gubernov, A. Kobolov, A. Polezhaev and H. Sidhu, Period Doubling and Chaotic Transient in a Model of Chain-Branching Combustion Wave Propagation, Proceedings of the Royal Society A, 2011. doi:10.1098/rspa.2009.0668 V. V. Gubernov, J. J. Sharples, H. S. Sidhu, A. C. McIntosh and J. Brindley, Properties of Combustion Waves in the Model with Competitive Exo- and Endothermic Reactions, Journal of Mathematical Chemistry, 50(8):2130–2140, 2012. doi:10.1007/s10910-012-0021-y V. V. Gubernov, H. S. Sidhu, G. N. Mercer, The Effect of Ambient Temperature on the Propagation of Nonadiabatic Combustion Waves, Journal of Mathematical of Mathematical Chemistry, 37(2):149–162, 2005. doi:10.1007/s10910-004-1447-7 A. Hmaidi, A. C. McIntosh and J. Brindley, A Mathematical Model of Hotspot Condensed Phase Ignition in the Presence of a Competitive Endothermic Reaction, Combustion Theory and Modelling, 14(6):893–920, 2010. doi:10.1080/13647830.2010.519050 D. A. Kessler, V. N. Gamezo and E. S. Oran, Simulations of Flame Acceleration and Deflagration-to-Detonation Transitions in Methane-Air Systems, Combustion and Flame, 157(11):2063–2077, 2010. doi:10.1016/j.combustflame.2010.04.011 F. Liu, D. L. S. McElwain and C. P. Please, Simulation of Combustion Waves for Two-Stage Reactions, Proceedings of the 8th Biennial Computational Techniques and Applications Conference (CTAC97), pages 385–392, 1998. A. Makino, Fundamental Aspects of the Heterogeneous Flame in the Self-Propagating High-Temperature Synthesis (SHS) Process, Progress in Energy and Combustion Sciences, 27(1):1–74, 2001. doi:10.1016/S0360-1285(00)00004-6 A. G. Merzhanov and E. N. Rumanov, Physics of Reaction Waves, Reviews of Modern Physics, 71(4):1173–1211, 1999. doi:10.1103/RevModPhys.71.1173 C. P. Please, F. Liu and D. L. S. McElwain, Condensed Phase Combustion Travelling Waves with Sequential Exothermic or Endothermic Reactions, Combustion Theory and Modelling, 7(1):129–143, 2003. doi:10.1088/1364-7830/7/1/307 W. E. Schiesser, The numerical method of lines: Integration of Partial Differential Equations, Academic Press, Inc, 1991. J. J. Sharples, H. S. Sidhu, A. C. Mcintosh, J. Brindley and V. V. Gubernov, Analysis of Combustion Waves Arising in the Presence of a Competitive Endothermic Reaction, IMA Journal of Applied Mathematics, 77(1):18–31, 2012. doi:10.1093/imamat/hxr072 V. P. Sinditskii, V. Y. Egorshev, A. I. Levshenkov and V. V. Serushkin, Ammonium nitrate: Combustion Mechanism and the Role of Additives, Propellants Explosives Pyrotechnics, 30(4):269–280, 2005. doi:10.1002/prep.200500017 J. Subrahmanyam and M. Vijayakumar, Self-Propagating High-Temperature Synthesis, Journal of Materials Science, 27(23):6249–6273, 1992. doi:10.1007/BF00576271 R. Turcotte, S. Goldthorp, C. M. Badeen and S. K. Chan, Hot-Wire Ignition of AN-Based Emulsions, Propellants Explosives Pyrotechnics, 33(6):472–481, 2008. doi:10.1002/prep.200700276 S. Walia, R. O. Weber, K. Latham, P. Petersen, J. T. Abrahamson, M. S. Strano, and K. Kalantar-zadeh, Oscillatory Thermopower Waves Based on BiTe Films, Advanced Functional Materials, 21(11):2072–2079, 2011. doi:10.1002/adfm.201001979 R. O. Weber, G. N. Mercer, H. S. Sidhu and B. F. Gray, Combustion Waves for Gases () and Solids (), Proceedings of the Royal Society of London A, 453(1960):1105–1118, 1997. doi:10.1098/rspa.1997.0062 W. Y. S. Wee, J. J. Sharples, H. S. Sidhu and V. V. Gubernov, Analysis of a Two-Stage Competitive Endothermic-Exothermic Reaction Scheme, Proceedings of the 40th Australian Chemical Engineering Conference (CHEMECA 2012), submitted June 2012
Analysing instability of combustion waves using the Evans function
Get PDFWe consider travelling wave solutions of a reaction-diffusion system corresponding to a single step, homogeneous, premixed combustion scheme with Newtonian heat loss and general Lewis number. Particular attention is paid to unstable combustion wave regimes, especially those associated with oscillatory behaviour. The instability analysis is conducted with the use of Evans function techniques, which we use to derive eigenvalues of the linear stability problem via the argument principle and Nyquist plots. These techniques permit the study of transitions to different modes of unstable behaviour in great detail. Threshold values of the parameters corresponding to Hopf and Bogdanov--Takens bifurcation are established and it is shown that for certain parameter values the system exhibits a period doubling route to chaotic behaviour.
References Afendikov, A. L. and Bridges, T. J. Instability of the Hocking--Stewartson pulse and its implications for three-dimensional Poiseuille flow. P. R. Soc. A, 457:1--16, 2001. doi:10.1098/rspa.2000.0665 Alexander, J., Gardner, R. and Jones, C. A topological invariant arising in the stability analysis of travelling waves. J. Reine Angew. Math., 410:167--212, 1990. Dold, J. W. Premixed flames modelled with thermally sensitive intermediate branching kinetics. Combust. Theor. Model., 11:909--948, 2007. doi:10.1080/13647830701294599 Dold, J. W., and Zinoviev, A. Fire eruption through intensity and spread rate interaction mediated by flow attachment. Combust. Theor. Model., 13:763--793, 2009. doi:10.1080/13647830902977570 FlexPDE. http://www.pdesolutions.com Gubernov, V. V., Mercer, G. N., Sidhu, H. S. and Weber, R. O. Evans function stability of combustion waves. SIAM J. Appl. Math., 63:1259--1275, 2003. http://www.siam.org/journals/siap/63-4/40024.html Gubernov, V. V., Mercer, G. N., Sidhu, H. S. and Weber, R. O. Evans function stability of non-adiabatic combustion waves. P. R. Soc. A, 460:2415--2435, 2004. doi:10.1098/rspa.2004.1285 Gubernov, V. V., Sidhu, H. S. and Mercer, G. N.. Generalized compound matrix method. Appl. Math. Lett., 19:458--463, 2006. doi:10.1016/j.aml.2005.07.002 Gubernov, V. V, Kolobov, A. V., Polezhaev, A. A., Sidhu, H. S. and Mercer, G. N. Period doubling and chaotic transient in a model of chain-branching combustion wave propagation. Proc. Roy. Soc. Lond. A, 466:2747--2769, 2010. doi:10.1098/rspa.2009.0668 Makino, A. Fundamental aspects of the heterogeneous flame in the self-propagating high-temperature synthesis (SHS) process. Prog. Energ. Combust., 27:1--74, 2001. Merzhanov, A. G., and Rumanov, E. N. Physics of reaction waves. Rev. Mod. Phys., 71:1173--1211, 1999. Pego, R. L., Smereka, P. and Weinstein, M. I. Oscillatory instability of travelling waves for a KdV-Burgers equation. Physica D, 67:45--65, 1993. http://www.sciencedirect.com/science/journal/01672789 Sandstede, B. Stability of travelling waves. In B. Fiedler, editor, Handbook of Dynamical Systems II, pp. 983--1055. Elsevier, 2002. Sharples, J. J., Sidhu, H. S. and Gubernov, V. V. Properties of nonadiabatic premixed combustion fronts arising in single-step reaction schemes. In Proceedings of Chemeca 2010, Paper No. 357, 26--29 September 2010, Adelaide. ISBN 978 085 825 9713. Thomas, P. H., Bullen, M. L., Quintiere, J. G. and McCaffrey, B. J. Flashover and instabilities in fire behaviour. Combust. Flame, 38:159--171, 1980. http://www.sciencedirect.com/science/article/pii/0010218080900486 Weber, R. O., G. N. Mercer, H. S. Sidhu, and Gray, B. F. Combustion waves for gases (Le) and solids (Le). Proc. Roy. Soc. Lond. A, 453:1105--1118, 1997. doi:10.1098/rspa.1997.006
Letter from Jason Lee to Mr. Carl J. Williams, County RR Supervisor., February 23, 1943
No full textRequesting a survey of property purchased by Lee
Geologic assessment of potential cable landing sites along the Oregon coast
No full textReport -- Plate 1. Detailed geology and other factors related to the suitability of potential cable landing sites in the Gold Beach area, southern Oregon -- Plate 2. Detailed geology and other factors related to the suitability of potential cable landing sites in the Rockaway Beach area, northern Oregon.by Reed J. Burgette, Eduardo F. Guerrero, Jonathan C. Allan, Fletcher E. O'Brien, Jason D. McClaughry, Lowell H. Anthony, Robert W. Hairston-Porter, and Jon J. Franczyk.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Randomized controlled trial of a diversion program for individuals with a history of repeat felony property crime and substance use
Get PDFMichael R. McCart, Ph.D., Jason E. Chapman, Ph.D., Zoe Alley, Ph.D., & Ashli J. Sheidow, Ph.D.Title from PDF title page (viewed on May 5, 2022)."This summary reports findings from a randomized controlled trial (RCT) of a front-end diversion program for non-violent, repeat felony property offenders who have a substance use problem and motivation to change their behavior. Oregon's Senate Bill 416 (SB416) program was developed by state leaders seeking an alternative to prison for individuals who were committing property crimes, at least in part, to support their use of illicit substances"--Page 5.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 35-36).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
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