Relevant bibliographies by topics / Lag order selection

Academic literature on the topic 'Lag order selection'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Lag order selection"

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Butler, Ronald, and Marc Paolella. "Autoregressive Lag—Order Selection Using Conditional Saddlepoint Approximations." Econometrics 5, no. 3 (September 19, 2017): 43. http://dx.doi.org/10.3390/econometrics5030043.

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Morales, Marco. "Lag order selection for an optimal autoregressive covariance matrix estimator." Journal of Applied Statistics 37, no. 5 (March 23, 2010): 739–48. http://dx.doi.org/10.1080/02664760902873969.

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Kapetanios, George. "Incorporating lag order selection uncertainty in parameter inference for AR models." Economics Letters 72, no. 2 (August 2001): 137–44. http://dx.doi.org/10.1016/s0165-1765(01)00433-5.

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Jia, Guijin, Youqing Wang, and Biao Huang. "Dynamic higher-order cumulants analysis for state monitoring based on a novel lag selection." Information Sciences 331 (February 2016): 45–66. http://dx.doi.org/10.1016/j.ins.2015.10.029.

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Cavaliere, Giuseppe, Luca De Angelis, Anders Rahbek, and A. M. Robert Taylor. "DETERMINING THE COINTEGRATION RANK IN HETEROSKEDASTIC VAR MODELS OF UNKNOWN ORDER." Econometric Theory 34, no. 2 (September 20, 2016): 349–82. http://dx.doi.org/10.1017/s0266466616000335.

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We investigate the asymptotic and finite sample properties of a number of methods for estimating the cointegration rank in integrated vector autoregressive systems of unknown autoregressive order driven by heteroskedastic shocks. We allow for both conditional and unconditional heteroskedasticity of a very general form. We establish the conditions required on the penalty functions such that standard information criterion-based methods, such as the Bayesian information criterion [BIC], when employed either sequentially or jointly, can be used to consistently estimate both the cointegration rank and the autoregressive lag order. In doing so we also correct errors which appear in the proofs provided for the consistency of information-based estimators in the homoskedastic case by Aznar and Salvador (2002, Econometric Theory 18, 926–947). We also extend the corpus of available large sample theory for the conventional sequential approach of Johansen (1995, Likelihood-Based Inference in Cointegrated Vector Autoregressive Models. Oxford University Press) and the associated wild bootstrap implementation thereof of Cavaliere, Rahbek, and Taylor (2014, Econometric Reviews 33, 606–650) to the case where the lag order is unknown. In particular, we show that these methods remain valid under heteroskedasticity and an unknown lag length provided the lag length is first chosen by a consistent method, again such as the BIC. The relative finite sample properties of the different methods discussed are investigated in a Monte Carlo simulation study. The two best performing methods in this study are a wild bootstrap implementation of the Johansen (1995, Likelihood-Based Inference in Cointegrated Vector Autoregressive Models. Oxford University Press) procedure implemented with BIC selection of the lag length and joint IC approach (cf. Phillips, 1996, Econometrica 64, 763–812) which uses the BIC to jointly select the lag order and the cointegration rank.
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Takeyasu, Kazuhiro. "Brand Selection and Its Matrix Structure―Expansion of its Block Matrix to the Third Order Lag―." Business and Management Research 5, no. 4 (November 25, 2016): 31. http://dx.doi.org/10.5430/bmr.v5n4p31.

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Focusing that consumers’ are apt to buy superior brand when they are accustomed or bored to use current brand, new analysis method is introduced. Before buying data and after buying data is stated using liner model. When above stated events occur, transition matrix becomes upper triangular matrix. In this paper, equation using transition matrix stated by the Block Matrix is expanded to the third order lag and the method is newly re-built. These are confirmed by numerical examples. S-step forecasting model is also introduced. This approach makes it possible to identify brand position in the market and it can be utilized for building useful and effective marketing plan.
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Liao, Zhipeng, and Peter C. B. Phillips. "AUTOMATED ESTIMATION OF VECTOR ERROR CORRECTION MODELS." Econometric Theory 31, no. 3 (March 13, 2015): 581–646. http://dx.doi.org/10.1017/s026646661500002x.

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Model selection and associated issues of post-model selection inference present well known challenges in empirical econometric research. These modeling issues are manifest in all applied work but they are particularly acute in multivariate time series settings such as cointegrated systems where multiple interconnected decisions can materially affect the form of the model and its interpretation. In cointegrated system modeling, empirical estimation typically proceeds in a stepwise manner that involves the determination of cointegrating rank and autoregressive lag order in a reduced rank vector autoregression followed by estimation and inference. This paper proposes an automated approach to cointegrated system modeling that uses adaptive shrinkage techniques to estimate vector error correction models with unknown cointegrating rank structure and unknown transient lag dynamic order. These methods enable simultaneous order estimation of the cointegrating rank and autoregressive order in conjunction with oracle-like efficient estimation of the cointegrating matrix and transient dynamics. As such they offer considerable advantages to the practitioner as an automated approach to the estimation of cointegrated systems. The paper develops the new methods, derives their limit theory, discusses implementation, reports simulations, and presents an empirical illustration with macroeconomic aggregates.
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Zhang, Bingkai, Benzhong Dai, Li Zhang, Jiali Liu, and Zhen Cao. "The Correlated Multi-color Optical Variations of BL Lac Object S5 0716+714." Publications of the Astronomical Society of Australia 27, no. 3 (2010): 296–301. http://dx.doi.org/10.1071/as09086.

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AbstractS5 0716+714 is a well-studied BL Lac object in the sky. Verifying the existence of correlations among the flux variations in different bands serves as an important tool to investigate the emission processes. To examine the possible existence of a lag between variations in different optical bands on this source, we employ a discrete correlation function analysis on the light curves. In order to obtain statistically meaningful values for the cross-correlation time lags and their related uncertainties, we perform Monte Carlo simulations called ‘flux redistribution/random subset selection’. Our analysis confirms that the variations in different optical light curves are strongly correlated. The time lags show a hint of the variations in high frequency band leading those in low frequency band of the order of a few minutes.
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Pinho, João Pedro, Bruno Mezêncio, Desidério Cano Porras, Julio Cerca Serrão, and Alberto Carlos Amadio. "Relationship Between Knee Extensors Power Output and Vastus Lateralis EMG Activation in Elderly Women: Influence of Mother Wavelet Selection." Open Sports Sciences Journal 10, no. 1 (December 29, 2017): 263–71. http://dx.doi.org/10.2174/1875399x01710010263.

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Purpose:The main objective of this study was to compare frequency parameters produced by six mother wavelets pinpointing the most feasible to investigate electromyographic (EMG) parameters while producing knee extension power in elderly women. The influence of different load conditions in mother wavelet selection and power output were also analyzed.Methods:Thirteen sedentary elderly women (69.3 ± 4.1 years) took part in the study. Participants executed 6 repetitions of 3 load condition (30%, 50% and 70% of the maximal) with the concentric phase of the knee extension movement as quickly as possible. Kinematic data obtained by video analysis, an anthropometric model and Newtonian mechanics were used to calculate knee extensors’ power. A continuous wavelet analysis was used as a time-frequency transformation strategy of vastus lateralis and biceps femoris EMG data and six different mother wavelets were selected: Morlet; 4th, 8th and 44th order Daubechie, 4th order Coiflet and 5th order Symlet.Results:44th order Daubechie showed the highest maximal cross correlation value and no differences were seen between different mother wavelets and cross correlation at zero lag and in the lag variable. Although increased knee extensors peak power at higher loads were seen, no differences in vastus lateralis or biceps femoris root mean square values were obtained.Conclusion:44th order Daubechie mother wavelet was pinpointed as the most suitable to obtain EMG time-frequency parameters. We have also seen that different load conditions do not seem to have an influence on mother wavelet selection.
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Papoulias, Fotis A. "On the Nonlinear Dynamics of Pursuit Guidance for Marine Vehicles." Journal of Ship Research 37, no. 04 (December 1, 1993): 342–53. http://dx.doi.org/10.5957/jsr.1993.37.4.342.

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A theoretical analysis of the nonlinear dynamic phenomena involved in pure pursuit guidance of marine vehicles is performed. Nomoto's model (Crane et al 1989) is used to provide the basis for the main vehicle turning lag. Results obtained in closed-form expressions demonstrate the existence of bifurcations to periodic solutions. The center manifold of the system is evaluated to within a third-order approximation. Third-and fifth-order expansions are utilized in order to provide information on limit cycle existence and stability. Recommendations regarding the appropriate selection of control design parameters are provided.
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Dissertations / Theses on the topic "Lag order selection"

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Singh, Shiu Raj. "Dynamics of macroeconomic variables in Fiji : a cointegrated VAR analysis." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/774.

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Abstract of thesis submitted in partial fulfilment of the requirements for the Degree of Master of Commerce and Management Dynamics of macroeconomic variables in Fiji : a cointegrated VAR analysis By Shiu Raj Singh The objective of this study is to examine how macroeconomic variables of Fiji inter-relate with aggregate demand and co-determine one another using a vector autoregression (VAR) approach. This study did not use a prior theoretical framework but instead used economic justification for selection of variables. It was found that fiscal policy, which is generally used as a stabilisation tool, did not have a positive effect on real Gross Domestic Product (GDP) growth in the short term. Effects on GDP growth were positive over the long term but not statistically significant. Furthermore, expansionary fiscal policy caused inflationary pressures. Fiji has a fixed exchange rate regime, therefore, it was expected that the focus of monetary policy would be the maintenance of foreign reserves. It was, however, found that monetary expansion in the short term resulted in positive effects on real GDP growth and resulted in inflation. The long term effects of monetary policy on real GDP growth were negative, which are explained by the fixed exchange rate regime, endogenous determination of money supply by the central bank, an unsophisticated financial market and, perhaps, an incomplete transmission of the policy. Both merchandise trade and visitor arrivals growth were found to positively contribute to short term and long term economic growth. Political instability was found not to have significant direct effects on real GDP growth but caused a significant decline in visitor arrivals which then negatively affected economic growth in the short term.
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"The effects of measurement error on the lag order selection in AR models." 2002. http://library.cuhk.edu.hk/record=b5891235.

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Books on the topic "Lag order selection"

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United States. Congress. Senate. Committee on the Judiciary. Selection of venue for multiple appeals of agency orders: Report (to accompany S. 1134). [Washington, D.C.?: U.S. G.P.O., 1987.

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Parliament, Great Britain. Canada: Copies or extracts of the correspondence and memorials or representations relative to the claim of Mr. Ryland, formerly secretary to the Executive Council of Canada. [London: HMSO, 2001.

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Parliament, Great Britain. Canada: Copies of correspondence relative to the affairs of Canada. [London: HMSO, 2001.

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Parliament, Great Britain. Canada: Copies or extracts of correspondence relative to the affairs of Canada. [London: HMSO, 2001.

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Parliament, Great Britain. Canada: Further return to an address of the Honourable the House of Commons, dated July 27, 1874 (as far as regards the Dominion of Canada) relating to the laws, ordinances, and regulations relative to the monastic and conventual institutions in various foreign countries (in continuation of [C.-1165] July 27th, 1874). London: G.E. Eyre and W. Spottiswoode, 2002.

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Parliament, Great Britain. Canada: Correspondence respecting the Canadian tariff. London: Eyre and Spottiswoode, 2002.

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Parliament, Great Britain. Canada: Reports on the forests of Canada. London: Eyre and Spottiswoode, 2002.

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Parliament, Great Britain. Canada: Correspondence on the subject of the law of copyright in Canada. London: Eyre and Spottiswoode, 2001.

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Parliament, Great Britain. Canada: Papers relative to the proposed changes in the Legislative Council of Canada. London: G.E.Eyre and W. Spottiswoode, 2002.

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Parliament, Great Britain. Canada: Further papers relative to the affairs of Canada : in continuation of the papers presented May, 1849. London: W. Clowes and Sons, 2002.

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Book chapters on the topic "Lag order selection"

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Miningou, Amos, Appolinaire S. Traoré, Essegbemon Akpo, Issoufou Kapran, Bertin M. Zagré, Gabriel A. Diasso, Yamba Kienthéga, and Apolinaire Zoungrana. "An Analysis of Groundnut Innovation Platform Achievements in Brokering Improved Varieties to Communities in TL III Project in Burkina Faso." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 31–49. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_3.

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AbstractAccess to seeds of improved groundnut varieties is the most critical problem of farmers in Burkina Faso. Firstly, majority do not know the existence of improved varieties and secondly the price is not affordable to them. Based on the above, the INERA groundnut breeders’ team established four innovation platforms on groundnut in the Region of Centre-East, Region of Centre-North, Region of Centre-West and Region de la Boucle of Mouhoun. Through these platforms, Quality Declared Seeds (QDS) were produced for the first time in Burkina Faso in 2016 with support from the Tropical Legumes phase III (TL III) project. Since then, QDS and certified seeds are produced and sold to the local communities at affordable small packs in order to make improved seeds accessible to the poor farmers. So far about 10,000 persons have been reached with small packs. Farmers, agricultural extension and NGO staff have been trained in groundnut seed production, demonstrations, field days and Farmer Participatory Variety Selection (FPVS) to promote the improved varieties and the best agronomic practices. Farmers’ yields increased from 500–700 kg/ha to 1200–1500 kg/ha increasing women and youth incomes from 200 USD to 800 USD/year only for those who grow groundnut during the rainy season. Those who grow during rainy and off-seasons their incomes can reach 1200–1500 USD. Links with financial institutions have facilitated access to credit for these farmers. In the future, the Platform sustainability will be assured through members’ annual financial contributions and strong production contracts among traders, processors and farmers.
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"Controller-Selecting Norms:." In Order without Law, 240–64. Harvard University Press, 2009. http://dx.doi.org/10.2307/j.ctvk12rdz.18.

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"Personnel selection." In Law and Order in Sung China, 251–82. Cambridge University Press, 1992. http://dx.doi.org/10.1017/cbo9780511529030.009.

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Sanmark, Alexandra. "Introducing the Assembly Sites of Scandinavia." In Viking Law and Order. Edinburgh University Press, 2017. http://dx.doi.org/10.3366/edinburgh/9781474402293.003.0003.

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Chapter 3 represents the starting point for the assembly site investigations by examining the layout and design of some of the most important thing sites across Scandinavia. It is demonstrated that these major assembly sites had many features and traits in common, albeit in ever-shifting patterns. When a thing site was first created, the location was carefully selected, as it needed to have the right topography, and often pre-existing anthropogenic features, such as burials. For the continued creation, or redesign of an existing assembly, a pool of features was available, from which a selection were added and presented in varying combinations. By bringing together archaeology, written sources and place-names, it is possible to characterise a range of features associated with assembly sites. This clearly demonstrates the most important result of this study: that a shared idea of what constituted an assembly site existed in the minds of the Norse. The detailed site investigations also show that the assemblies that were designated as top-level sites have the most striking monuments and design. The archaeology of these sites therefore reflects the hierarchy spelt out in the written sources.
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Viktor, Kreuschitz, and Nehl Hanns Peter. "Part II The Notion of State Aid, 4 Criterion of Selectivity." In State Aid Law of the European Union. Oxford University Press, 2016. http://dx.doi.org/10.1093/law-ocl/9780198727460.003.0008.

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This chapter addresses the criterion of selectivity. The need to ascertain the selectivity of a measure in order to determine whether it constitutes a State aid derives directly from the text of Article 107(1) TFEU. Intuitively, it is actually the very fact that a measure favours only some of the market players that makes it apt to undermine the existence of a level playing field. Therefore, the ‘selectivity’ character seems to be conceived as a means by which a given measure distorts or threatens to distort competition. Article 107(1) TFEU seems to exclude from its scope general measures which are not selective but which may nevertheless be capable of distorting or threatening to distort competition; such general measures should not be qualified as a State aid. Therefore, where an anti-competitive effect of a measure is detected, it can be considered as selective only if, in its functioning, it favours certain undertakings or the production of certain goods.
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Dieter, Fleck. "19 The Law of Non-International Armed Conflict." In The Handbook of International Humanitarian Law. Oxford University Press, 2021. http://dx.doi.org/10.1093/law/9780198847960.003.0019.

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This chapter provides an overview of the law of non-international armed conflicts and its progressive development. The law of armed conflict, as it has developed in the last part of the nineteenth and the first part of the twentieth century, deals predominantly with wars between states. Its basic principles and rules are, however, likewise relevant for non-international armed conflicts: in all armed conflicts, elementary considerations of humanity must be respected under all circumstances, in order to protect victims, to reduce human sufferings, and to minimize damages to objects vital for survival. Therefore, the parties to the conflict do not have an unlimited choice of the means and methods of conducting hostilities, nor of selecting the targets to be attacked, and they must protect the victims from the effects and consequences of war. This concept is reflected in the principles and rules of international humanitarian law, to be respected by all and, while taking military necessity into account, limiting the use of force for humanitarian reasons. Parties to the conflict respecting these principles and rules are considered as respecting the international order, while those seriously violating them will commit internationally wrongful acts and perpetrators are liable to punishment.
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"Fables (selections)." In Fénelon, edited by Ryan Patrick Hanley, 15–25. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190079581.003.0002.

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The Fables are drawn from several short texts that Fénelon’s editors have previously gathered under the title Fables et opuscules pédagogiques. They comprise a range of writings that Fénelon composed for the political education of the Duke of Burgundy, grandson of Louis XIV and Petit Dauphin, during his tenure as court tutor. Important contributions to a genre pioneered by Aesop and La Fontaine, they have long been regarded as significant literary achievements as well as key vehicles for lessons in the virtues necessary for just rule and the means of establishing political order.
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García Florenciano, María, and Juan Muñoz López. "Hacia la integración de lengua y contenido a través del aprendizaje digital y la clase invertida." In Five years of ELEUK conferences: a selection of short papers from 2019, 7–18. Research-publishing.net, 2020. http://dx.doi.org/10.14705/rpnet.2020.41.1071.

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El aprendizaje integrado de la lengua y otros contenidos curriculares en los programas de lenguas modernas ofrece valiosas posibilidades para el desarrollo de la competencia intercultural, las destrezas lingüísticas y la motivación del aprendiente. Con el objetivo de potenciar esta integración, se han programado una serie de talleres y actividades dentro de las asignaturas de lengua y de contenido existentes en los programas de Estudios Hispánicos en la Universidad de Leeds (Reino Unido). Estas actividades se han diseñado teniendo presente el enfoque de las 4 C (Coyle, 1999): contenido (¿cuáles son los objetivos de aprendizaje?), conocimiento (¿qué habilidades cognitivas de orden superior o inferior se incluyen?), comunicación (¿cuál será la lengua del aprendizaje, la lengua para el aprendizaje y la lengua a través del aprendizaje?), cultura (desarrollo de una conciencia pluricultural). El modelo pedagógico que ofrece la clase invertida, facilitado por el uso de varias herramientas digitales, nos permite trasladar la instrucción directa al espacio individual, fuera del aula y antes de la clase. De esta manera pretendemos potenciar el aprendizaje autónomo y que la dinámica del aula pueda centrarse en el aprendizaje activo de los estudiantes, el pensamiento crítico, la colaboración y la retroalimentación (Bergmann, Overmyer y Willie, 2011).
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Mallon, Christopher, Shai Y. Waisman, and Ray C. Schrock. "Venue and Forum Selection in the US and UK." In The Law and Practice of Restructuring in the UK and US. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198755395.003.0008.

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Most bankruptcy cases in the US are heard by specialized bankruptcy courts, which are vested with authority to hear such cases by the US district courts. The United States Congress granted US district courts original and exclusive jurisdiction over—that is, the authority to hear—US bankruptcy cases. However, district courts may (and uniformly do) refer such cases and proceedings to the bankruptcy courts in their respective districts, often pursuant to standing referral orders (in other words, the referral to the bankruptcy courts is automatic).
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Surmen, Hasan Kemal, Nazif Ekin Akalan, and Yunus Ziya Arslan. "Design, Manufacture, and Selection of Ankle-Foot-Orthoses." In Advanced Methodologies and Technologies in Artificial Intelligence, Computer Simulation, and Human-Computer Interaction, 250–66. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7368-5.ch020.

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Ankle-foot-orthoses (AFOs) are externally applied assistive devices that are prescribed to the patients with neuromuscular dysfunctions in order to improve abnormal lower limb motor functions. To improve the effectiveness of the AFOs, novel patient-specific designs have been carried out for recent years. According to the level and type of the dysfunctions, there are a variety of designs available in clinics. Different AFO designs, such as solid, dynamic, and hinged can be prescribed for different abnormalities. New designs lead to development of new manufacturing methods. The most conventional manufacturing technique includes a molding process in which the lower part of the leg is casted by producing a positive cast to represent patients' shank, ankle, and foot. However, different manufacturing methods have been improved due to the different design and material requirements. All these developments affect the selection of the AFO. In this chapter, a substantial survey regarding design, manufacture, and selection of AFOs is provided and future trends about these issues are discussed.
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Conference papers on the topic "Lag order selection"

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Echols-Jones, Piers M., Maxim E. Dokukin, Igor Sokolov, and William C. Messner. "Advanced Manual System Identification Using Lead and Lag Compensators With Complex Poles and Zeros." In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9854.

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Automated methods for deriving dynamic models from frequency response data of high-order dynamics systems are the default choice of most engineers. However, these methods themselves often require manual tuning of weighting parameters, a priori selection of system order, and even by hand removal of extraneous dynamics. On the other hand, manually matching complicated features in the Bode plot of the frequency response of high-order system is difficult with conventional first and second order numerators and denominators. In this papers we present a manual technique for systematically creating a dynamic model from Bode plots of frequency response data with complicated features. We apply the method to identifying dynamics of a piezoelectric stage holding the sample of an atomic force microscope (AFM). We show the manual method works better than the tfest command of Matlab™ for this example system.
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Ma, Jungmok, and Harrison M. Kim. "Predictive Modeling of Product Returns for Remanufacturing." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46875.

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As awareness of environmental issues increases, the pressures from the public and policy makers have forced OEMs to consider remanufacturing as the key product design option. In order to make the remanufacturing operations more profitable, forecasting product returns is critical with regards to the uncertainty in quantity and timing. This paper proposes a predictive model selection algorithm to deal with the uncertainty by identifying better predictive models. Unlike other major approaches in literature (distributed lag model or DLM), the predictive model selection algorithm focuses on the predictive power over new or future returns. The proposed algorithm extends the set of candidate models that should be considered: autoregressive integrated moving average or ARIMA (previous returns for future returns), DLM (previous sales for future returns), and mixed model (both previous sales and returns for future returns). The prediction performance measure from holdout samples is used to find a better model among them. The case study of reusable bottles shows that one of the candidate models, ARIMA, can predict better than the DLM depending on the relationships between returns and sales. The univariate model is widely unexplored due to the criticism that the model cannot utilize the previous sales. Another candidate model, mixed model, can provide a chance to find a better predictive model by combining the ARIMA and DLM. The case study also shows that the DLM in the predictive model selection algorithm can provide a good predictive performance when there are relatively strong and static relationships between returns and sales.
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Hassanien, Sherif, Len Krissa, and Vitaly Vorontsov. "Pipeline Coating Selection Process: A Hybrid Multi-Criteria Based Approach." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33264.

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The most critical component of external corrosion prevention on pipeline is the protective coating system. The coating selection process can be extremely challenging due to the sheer number of manufacturers and products/options that are offered — often with limited performance data available. Relying solely on manufacturer’s recommendations or information can be problematic when the anticipated service environment has not been adequately characterized, application parameters not completely understood, and/or when there is a misunderstanding of the product’s capabilities. Although there are many test methods for evaluation of pipe coatings, there are no commonly accepted test protocols or acceptance criteria for selecting coatings. Moreover, laboratory based testing is often complicated, expensive, and rarely provides an accurate simulation of field conditions. Although in-house subject matter experts (SMEs) and/or independent coating specialists provide some confidence in coating selection, the diversity of background and experience between these experts frequently creates inconsistency in coating evaluations and can produce divergent or conflicting recommendations. In this paper, an innovative approach is proposed to address these coating selection process challenges. The proposed approach incorporates a systematic analysis of critical material attributes within an expert environment, and applies established decision making techniques to the evaluation. Priorities are developed by structuring a hierarchy of criteria and eliciting technical judgment of company’s SMEs, stakeholders, and unbiased industry specialists. The Deterministic Analytic Hierarchy Process (d-AHP) is applied using pairwise comparisons for prioritizing coating products/options and achieving an optimal selection. The experts’ opinions can then be updated by technical lab-based results for a smaller selection of top ranked products. Laboratory tests would be expected to be completed annually based on smart selection of certain products and to ensure year-over-year consistency. This paper also presents a probabilistic approach that improves d-AHP in order to capture uncertainties in experts’ opinions and/or lab results through probabilistic AHP (p-AHP). Although this approach is not widely used within the pipeline industry, there is a potential opportunity to improve conventional approaches for selecting and approving coatings for pipelines based on a systematic/quantitative approach.
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Neelamani, S., and K. Al-Banaa. "Variation in Wave Forces on Buried Submarine Pipeline in Different Types of Soils in Random Waves." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83018.

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Submarine pipelines encounter significant wave forces in shallow coastal waters due to the action of waves. In order to reduce such forces (also to protect the pipe against anchors and dropped objects) they are buried below the seabed. The wave force variation due to burial depends on the engineering characteristics of the sub soil like hydraulic conductivity and porosity, apart from the design environmental conditions. For a given wave condition, in certain type of soil, the wave force can reduce drastically with increased burial and in certain other type of soil, it may not. It is hence essential to understand how the wave forces (both horizontal and vertical) vary while the pipeline is buried in soils of different hydraulic conductivity. The selection of minimum safe burial depth of submarine pipelines mainly depends on the magnitude of wave force on the buried submarine pipeline. The minimum safe burial depth is the depth of burial at which the hydrodynamic forces encountered by the submarine pipelines do not destabilize them during the design environmental condition. The variation of wave forces on buried submarine pipeline is investigated using four different cohesion less soils with hydraulic conductivity varying from 0.286 mm/s to 1.84 mm/s. The physical modeling investigations were carried out for a wide range of random wave conditions (PM spectrum with significant wave heights from 5 to 20 cm and peak period from 1.0 to 3.0 s) and for different depth of burial. The horizontal and vertical hydrodynamic forces on the submarine pipeline were estimated by numerically integrating the measured dynamic pressures around the circumference of the pipe line at 12 points. It is found from the study that the horizontal force reduces with increase in depth of burial, and is less dependent on the hydraulic conductivity of the soil. Whereas, the vertical wave force varies quite significantly (generally increases up to certain depth of burial and reduces with further increase in depth of burial), mainly due to the significant change in the magnitude and the phase lag between the dynamic pore water pressures. In general, if the hydraulic conductivity is high (order of 1.84 mm/s), then varying the relative burial depth from e/D = 0.5 to 1.5 does not provide appreciable advantage from the vertical force reduction point of view. On the other hand, for a soil with low hydraulic conductivity (order of 0.29 mm/s), changing the depth of burial from e/D = 0.5 to 1.5 reduces the vertical wave force more than 50%, where ‘e’ is the vertical distance between the sea floor and pipeline bottom and ‘D’ is the pipeline diameter. For half buried (or half exposed) condition, the pipeline in the soil with high hydraulic conductivity attracts the least vertical force and attracts high vertical force in the soil with low hydraulic conductivity, due to appreciable Bernoulli effect in low hydraulic conductivity soil. The results of this study will help the submarine pipeline design engineers to select the minimum safe burial depth in a range of cohesion-less soil in a wide range of hydraulic conductivity and random wave conditions.
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5

Cardona, Fernando, and Juan A. Llorens-Molina. "Influencia del orden de matrícula en la elección de grupo, en los resultados académicos y la encuesta de valoración del profesorado." In INNODOCT 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/inn2019.2019.10122.

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Al inicio del primer curso universitario los alumnos escogen grupo por orden de matrícula, y este orden viene condicionado por la nota obtenida en la prueba del selectivo. Los profesores observan en general una clara influencia de la nota de selectivo en la capacidad de aprendizaje del alumnado, al menos comparando entre grados con notas de corte considerablemente distintas. En este sentido, la prueba del selectivo parece ser un buen indicador de esta capacidad de aprendizaje. También se ha observado que, en general, los alumnos con mejores notas en el selectivo (y preferencia en el orden de matrícula) tienden a escoger el grupo A, y dentro del mismo el subgrupo A1 antes que el A2, independientemente de otros factores como pueden ser el horario o el profesorado que imparte la docencia de cada grupo. Por este motivo, los grupos se completan en el orden alfabético-numérico lógico: primero A1, después el A2, luego el B1, y por último el B2. En el presente trabajo se analizan las calificaciones por grupos de la Unidad Didáctica 2 (Química Física) de la asignatura Fundamentos Químicos en Ciencia y Tecnología de los Alimentos, de primer curso del Grado en Ciencia y Tecnología de los Alimentos de la Univeristat Politècnica de València. Los resultados demuestran la influencia del orden de matrícula (reflejada como grupo de matrícula) en las calificaciones obtenidas, siendo sustancialmente mejores en el grupo A, incluso en las prácticas de laboratorio, y teniendo en cuenta que es el mismo profesor el que imparte los dos grupos de teoría, y otro profesor el que imparte los dos grupo de prácticas. Además, se ve una clara influencia en la valoración que los alumnos de cada grupo hacen de la asignatura y del profesor, como muestran los resultados de las encuestas de opinión del alumnado, que se realizan después de calificarse la primera convocatoria de la unidad didáctica.
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Chalet, David, Pascal Chesse, Jean-Franc¸ois Hetet, and Xavier Tauzia. "Some Basic Elements to Achieve a Future 1D Simulation of Wave Propagation in I.C.E. Pipes." In ASME 2002 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ices2002-449.

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The assumption of one-dimensional unsteady flows in the inlet and exhaust systems of turbocharged diesel engines is widely used although multi-dimensional simulations using fluid dynamics are also possible. However, difficulties persist concerning the boundary conditions, particularly at the pipe ends (inflow or outflow) and at the intra-pipe boundary conditions (sudden or gradual area changes, bends, junctions, etc.). This paper focuses on the two first steps leading to a 1D flow simulation code: the selection of a numerical scheme and the study of an open end boundary condition. The first section compares several numerical algorithms, including Lax-Wendoff, Flux-Corrected-Transport methods (FCT), and Harten-Lax-Leer (Riemann solver), extended to the second order. The selection criterion is the best compromise between numerical instabilities and computational time. A numerical study using the Fluent CFD code is then presented on a constant area duct in order to determine some characteristics at the pipe end, specifically the dead zone length and the throat area. Finally, a model parameterized by the pressure ratio between inlet and outlet is proposed.
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Robinett, Rush D., and David G. Wilson. "Decentralized Exergy/Entropy Thermodynamic Control for Collective Robotic Systems." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43691.

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This paper develops a distributed decentralized control law for collective robotic systems. The control laws are developed based on exergy/entropy thermodynamic concepts and information theory. The source field is characterized through second-order accuracy. The proposed feedback control law stability for both the collective and individual robots are demonstrated by selecting a general Hamiltonian based solution developed as Fisher Information Equivalency as the vector Lyapunov function. Stability boundaries and system performance are then determined with Lyapunov’s direct method. A robot collective plume tracing numerical simulation example demonstrates this decentralized exergy/entropy collective control architecture.
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Auburtin, Erwan, Eric Morilhat, Stéphane Paquet, Abdeslam Raissi, Ewoud van Haaften, Olaf van Schalkwijk, and Tieneke Postma. "Structural Design and Validation of Prelude’s Marine Loading Arms." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18641.

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Abstract Prelude Floating Liquefied Natural Gas (FLNG) facility reached a significant milestone in June 2018 when gas was introduced onboard for the first time as part of the facility startup process, loaded from an LNG carrier moored in side-by-side (SBS) configuration. This first offshore LNG SBS operation allowed Prelude’s utilities to switch from running on diesel to running on gas. SBS mooring is the base case configuration for of floading both LNG and Liquefied Petroleum Gas (LPG) into product carriers using Marine Loading Arms (MLA) once the Prelude FLNG facility is fully operational. These complex and weather sensitive operations are expected to take place on a weekly basis. This means critical decisions about weather-window and timing should be supported as much as possible by predictive analysis and modelling of environment forecasts to reduce the risks. Prelude Floating Liquefied Natural Gas (FLNG) is designed to offload Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG) to carrier vessels moored in a side-by-side (SBS) configuration, using Marine Loading Arms (MLA) technology. For onshore terminals or small/medium FLNG, the traditional design of MLA (Double Counterweight Marine Arm – DCMA), featuring a vertical riser, can be used. However due to the exceptional freeboard of Prelude a new type of MLA was designed, namely the Offshore Loading Arm Footless (OLAF), without vertical riser in order to reach the LNG or LPG manifolds located as far as about 16 meters below the MLA base. Thanks to the OLAF design, the length and weight of the articulated MLA sections is reduced in comparison with conventional DCMA, and so are the dynamic loads applied by the MLA on the vessel manifold, which was mandatory to remain below the acceptable stress limit of standard LNG/LPG carrier manifolds. OLAF employs the field proven targeting system (TS) allowing the connection and disconnection of the MLA to the vessel manifold in dynamic conditions. This paper describes the assumptions and process to design and validate this new system — in terms of overall geometry and structural design, while verifying project feasibility, aiming at a reliable design of all components and minimizing the risks during operations. The key challenges and lessons learnt are also discussed. This innovative type of MLA had to be thoroughly designed and tested before being manufactured and assembled on the FLNG. The innovation management was also coupled with the additional challenge imposed by the expected highly dynamic conditions of relative motion between vessels that were never encountered for such systems in the past. MLA were designed with the objective to cover the operable envelope induced by berthing, mooring and relative motion criteria, so that it should not become an additional criterion in general. Since such an envelope is larger for this offshore application compared to sheltered terminals, this objective was particularly challenging but could be met thanks to the OLAF design. The SBS hydrodynamic numerical model is based on potential theory and includes multi-body coupling, non-linear mooring characteristics and coupling with sloshing. This model was calibrated using wave basin tests with a good agreement, and was used to determine the maximum operable environments and associated MLA envelope, using a 39-year hindcast for various LNG carriers and considering a scenario with different criteria and loading conditions. More than 100,000 time-domain simulations were required to evaluate non-linear quantities on a reduced set of environment ‘bins’. The new OLAF-type MLA was developed using these hydrodynamic simulations. Specific processes — based on spectral screening and selection using relevant criteria — were used to identify and select, in a systematic way, the designing load cases for connecting, connected, and emergency disconnection cases, while complying with the maximum allowable loads of conventional LNG and LPG carrier manifolds. An instrumented 1:4 OLAF scale model was built and tested with 6 degrees of freedom hexapods reproducing the motions on both sides of the OLAF which enabled us to confirm a 10% accuracy of the numerical studies results. The actual OLAF were dynamically tested with a full scale motion simulator before shipment to the yard for installation. The successful first operations were performed safely and confirmed the validity of the design. Measurements are now collected onboard Prelude to verify the design and when possible improve the accuracy of numerical modelling.
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Strada, Roberto, Bruno Zappa, and Hermes Giberti. "An Unified Design Procedure for Flying Machining Operations." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82392.

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“Flying machining” represents synchronization of an axis (slave) with a master axis in motion. One of the most important aspects of the design of “flying machining” operation is the choice of the proper law of motion of the slave axis. In literature, technical reports and papers can be found concerning this subject, but they deal with specific problems and the solutions or suggestions proposed are specific as well, suitable for those cases. In order to try to overcome this limitation, in this paper we analyze the subject of the flying machining operations from a wider point of view. We propose a unified design procedure with general validity, suitable for the choice of the slave axis’ law of motion for whatever “flying machining” operation. Furthermore methodologies for the selection of the drive system will be proposed. The procedure is described applying it on a cross sealing operation, typical of wrapping machine.
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10

Hsieh, Ming Feng, and Junmin Wang. "Backstepping Based Nonlinear Ammonia Surface Coverage Ratio Control for Diesel Engine Selective Catalytic Reduction Systems." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2567.

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This paper presents an ammonia surface coverage ratio control approach based on the backstepping concept for diesel engine selective catalytic reduction (SCR) systems. SCR models with multiple cells connected in cascade provide more accurate representations of the actual SCR system dynamics by considering the spatial distribution. Control of SCR system ammonia coverage ratio is critically important and effective in terms of ensuring low tailpipe NOx and ammonia emissions. However, such a task is also very challenging primarily due to the nonlinearities of the SCR dynamics and limited ammonia injection control authority. Grounded in the understanding of the SCR nonlinear dynamic characteristics, a backstepping-based nonlinear control law is then proposed to regulate the ammonia surface coverage ratio of the last SCR cell in order to tightly control the tailpipe NOx and ammonia emissions. Lyapunov-based analyses show the stability of the designed control law. FTP75 test cycle simulation results based on a full-vehicle (including engine, chassis, and aftertreatment systems) model illustrated that, compared with a conventional PID controller, the nonlinear backstepping control law can more appropriately handle the SCR system dynamics and exhibits superior ammonia coverage ratio control capability.
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Reports on the topic "Lag order selection"

1

Berkowitz, Jacob. Quantifying functional increases across a large-scale wetland restoration chronosequence. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41500.

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Over 300,000 ha of forested wetlands have undergone restoration within the Mississippi Alluvial Valley region. Restored forest successional stage varies, providing opportunities to document wetland functional increases across a large-scale restoration chronosequence using the Hydrogeomorphic (HGM) approach. Results from >600 restored study sites spanning a 25-year chronosequence indicate that: 1) wetland functional assessment variables increased toward reference conditions; 2) restored wetlands generally follow expected recovery trajectories; and 3) wetland functions display significant improvements across the restoration chronosequence. A functional lag between restored areas and mature reference wetlands persists in most instances. However, a subset of restored sites have attained mature reference wetland conditions in areas approaching or exceeding tree diameter and canopy closure thresholds. Study results highlight the importance of site selection and the benefits of evaluating a suite of wetland functions in order to identify appropriate restoration success milestones and design monitoring programs. For example, wetland functions associated with detention of precipitation (a largely physical process) rapidly increased under post restoration conditions, while improvements in wetland habitat functions (associated with forest establishment and maturation) required additional time. As the wetland science community transitions towards larger scale restoration efforts, effectively quantifying restoration functional improvements will become increasingly important.
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