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Journal articles on the topic 'Transient Stabilitet'

Author: Grafiati

Published: 23 June 2021

Last updated: 1 February 2022

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1

Calderón-Guizar, Jorge Guillermo. "Estudios de estabilidad transitoria en sistemas eléctricos industriales con generación propia interconectados con el sistema de transmisión." Ingeniería, investigación y tecnología 11, no. 4 (October 1, 2010): 445–51. http://dx.doi.org/10.22201/fi.25940732e.2010.11n4.038.

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2

Patel, Lalit K., Kaushik M. Sangada, Sunil S. Changlani, and Ankit M. Patel. "Coordination Of Pss And Statcom To Enhance The Power System Transient Stability." Indian Journal of Applied Research 1, no. 9 (October 1, 2011): 62–64. http://dx.doi.org/10.15373/2249555x/jun2012/24.

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3

Schulz, Axel, and Alexander Villinger. "Stabilized Transient R2PN Species." Angewandte Chemie International Edition 52, no. 11 (February 13, 2013): 3068–70. http://dx.doi.org/10.1002/anie.201208533.

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4

Suzuki, Kenichi, Fumiyuki Sanematsu, Takahiro Fujiwara, Michael Edidin, and Akihiro Kusumi. "S3B5 Stimulation-induced formation of transient but stabilized rafts.(Single Molecure Dynamics and Reactions)." Seibutsu Butsuri 42, supplement2 (2002): S14. http://dx.doi.org/10.2142/biophys.42.s14_4.

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5

Rathi, N. V., and H. S. Dalvi. "Design of Fuzzy Controller for Improvement of Transient Stability of Hybrid Energy Generation System." International Journal of Engineering and Technology 4, no. 5 (2012): 626–28. http://dx.doi.org/10.7763/ijet.2012.v4.447.

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6

Marreddy, Uma Vani, Ramana Rao P.V., and Rao P. V. Kumar S.V. "Fuzzy Logic Controller for Enhancement of Transient Stability in Multi Machine AC-DC Power Systems." International Journal of Engineering and Technology 2, no. 5 (2010): 423–29. http://dx.doi.org/10.7763/ijet.2010.v2.159.

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7

Piotrowski, Andrew, Ping Luo, and Donald A. Morrison. "Competence for Genetic Transformation in Streptococcus pneumoniae: Termination of Activity of the Alternative Sigma Factor ComX Is Independent of Proteolysis of ComX and ComW." Journal of Bacteriology 191, no. 10 (March 13, 2009): 3359–66. http://dx.doi.org/10.1128/jb.01750-08.

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ABSTRACT Competence for genetic transformation in Streptococcus pneumoniae is a transient physiological state whose development is coordinated by a peptide pheromone (CSP) and its receptor, which activates transcription of two downstream genes, comX and comW, and 15 other “early” genes. ComX, a transient alternative sigma factor, drives transcription of “late” genes, many of which are essential for transformation. In vivo, ComW both stabilizes ComX against proteolysis by the ClpE-ClpP protease and stimulates its activity. Interestingly, stabilization of ComX by deletion of the gene encoding the ClpP protease did not extend the period of competence. We considered the hypothesis that the rapid decay of competence arises from a rapid loss of ComW and thus of its ComX stimulating activity, so that ComX might persist but lose its transcriptional activity. Western analysis revealed that ComW is indeed a transient protein, which is also stabilized by deletion of the gene encoding the ClpP protease. However, stabilizing both ComX and ComW did not prolong either ComX activity or the period of transformation, indicating that termination of the transcriptional activity of ComX is not dependent on proteolysis of ComW.

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8

Rezazadeh, A., M. Sedighizadeh, and A. Alavian. "Optimal Sizing and Sitting of Distributed Generation for Power System Transient Stability Enhancement Using Genetic Algorithm." International Journal of Engineering and Technology 1, no. 5 (2009): 387–90. http://dx.doi.org/10.7763/ijet.2009.v1.73.

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9

Pradipta, Adya, Mochammad Facta, and Sudjadi Sudjadi. "PERANCANGAN KONVERTER ARUS SEARAH TIPE BUCK CONVERTER DENGAN UMPAN BALIK (FEEDBACK) MENGGUNAKAN IC TL494 SEBAGAI STABILITAS TEGANGAN PENGISIAN BATERAI." TRANSIENT 7, no. 4 (May 25, 2019): 933. http://dx.doi.org/10.14710/transient.7.4.933-940.

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Sumber listrik DC mulai banyak dikembangkan di berbagai sektor terutama di bidang kelistrikan dan otomotif. Hal ini dampak dari inovasi perkembangan teknologi yang sangat pesat khususnya pada perangkat dengan basis sumber listrik DC. Baterai dan perangkat elektronik adalah perangkat berbasis listrik DC yang banyak dikembangkan dan membutuhkan suplai tegangan yang stabil. Jika tegangan tidak stabil maka membuat perangkat menjadi panas, masa penggunaan (lifetime) berkurang bahkan bisa rusak. Untuk itu peran regulator stabilitas tegangan sangat penting pada perangkat berbasis listrik DC. Permasalahan tersebut dibahas dalam penelitian ini menggunakan buck converter sebagai stabilitas tegangan untuk pengisian baterai. Pada penelitian ini, dilakukan dua pengujian konverter yaitu tanpa umpan balik tegangan dan dengan umpan balik tegangan. Hasil pengujian konverter tanpa umpan balik tegangan pada variasi tegangan masukan maksimal 30 V memiliki penurunan tegangan dari beban 390 Ω ke 50 Ω sebesar 5,528 V. Kemudian pada pengujian konverter dengan umpan balik tegangan, nilai tegangan keluaran dapat dijaga konstan sebesar 13,8 V dengan variasi beban 390 Ω ke 50 Ω dan deviasi rata-rata 0,001 volt. Efisiensi rata – rata buck converter dengan umpan balik tegangan pada variasi beban 390 Ω ke 50 Ω adalah 70,094%. Pengujian dengan menggunakan kontrol umpan balik tegangan pada konverter arus searah tipe buck converter menghasilkan nilai tegangan yang lebih stabil dibandingkan pengujian konverter tanpa umpan balik tegangan.

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10

UCHIDA, A., T. SATO, S. YOSHIMORI, and F. KANNARI. "TRANSIENT CHARACTERISTICS BETWEEN PERIODIC ATTRACTORS STABILIZED BY CHAOS CONTROL IN A SEMICONDUCTOR LASER." International Journal of Bifurcation and Chaos 13, no. 05 (May 2003): 1309–17. http://dx.doi.org/10.1142/s0218127403007254.

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We investigate the transient response time between periodic attractors stabilized by chaos control methods in a semiconductor laser. We use the revised occasional proportional feedback (ROPF) method to shorten the transient response time and compare it with the high frequency injection (HFI) method. A chaotic attractor is stabilized resulting in two different periodic attractors (period-1 and period-6) under different control parameters, and the transient response time is measured as one of the stabilized periodic attractors is switched to the other. During the transition, the trajectory approaches a certain unstable periodic orbit (UPO), and the distance between the trajectory in the phase space and the UPO can be described as an exponential function of the transient response time. Since the trajectory can directly converge into the periodic orbit by using the ROPF method, the transient response time obtained by the ROPF method can be shortened more than that obtained by the HFI method.

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11

Noguchi, S., A. Ishiyama, T. Satow, and N. Yanagi. "Transient stability of large aluminum stabilized superconductors." IEEE Transactions on Appiled Superconductivity 9, no. 2 (June 1999): 624–27. http://dx.doi.org/10.1109/77.783373.

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12

Henao, Carlos A. A., Alvaro L. G. A. Coutinho, and Leopoldo P. Franca. "A stabilized method for transient transport equations." Computational Mechanics 46, no. 1 (January 13, 2010): 199–204. http://dx.doi.org/10.1007/s00466-010-0465-5.

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13

Isaev, Yu N., V. A. Kolchanova, and S. S. Tarasenko. "Mathematical Model of Synchronous Generator without Damper Windings which is Equipped with an Automatic Stabiliser." Applied Mechanics and Materials 792 (September 2015): 56–61. http://dx.doi.org/10.4028/www.scientific.net/amm.792.56.

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The models of the synchronous generator for calculating the steady-state and transient regimes including the transients of stator windings of generator without damper windings have been presented. The ability to use different mathematical approximations of the generator models depending on the spatial distance of the disturbance point has been shown. The examples of the generator models without damper windings which is equipped with an automatic stabilizer have been given. To determine the currents and voltages as functions of time the state-space technique and Park – Gorev transformation have been used. Solutions are obtained by means of the program called integrated environment MathCAD Runge-Kutta method.It is possible to use these models in networks containing synchronous generators and also for the design of objects containing generators.

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14

Mandal, Debdeep, Felix Stein, Shubhadeep Chandra, Nicolás I. Neuman, Pallavi Sarkar, Shubhajit Das, Abhinanda Kundu, et al. "Trisubstituted geminal diazaalkene derived transient 1,2-carbodications." Chemical Communications 56, no. 59 (2020): 8233–36. http://dx.doi.org/10.1039/d0cc02807j.

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15

Heumann, Holger, Ralf Hiptmair, and Cecilia Pagliantini. "Stabilized Galerkin for transient advection of differential forms." Discrete & Continuous Dynamical Systems - S 9, no. 1 (2016): 185–214. http://dx.doi.org/10.3934/dcdss.2016.9.185.

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16

Rajarajan, R., and Dr R. Prakash. "Transient Stability Enhancement for Distribution System Using three Phase Unified Power Quality Conditioner with an Intrinsic Power Prediction Technique." Journal of Advanced Research in Dynamical and Control Systems 11, no. 12-SPECIAL ISSUE (December 31, 2019): 1138–50. http://dx.doi.org/10.5373/jardcs/v11sp12/20193321.

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17

Taylor, David J. R., Syed M. Hamid, Allen M. Andres, Hannaneh Saadaeijahromi, Honit Piplani, Juliana F. Germano, Yang Song, et al. "Antiviral Effects of Menthol on Coxsackievirus B." Viruses 12, no. 4 (March 28, 2020): 373. http://dx.doi.org/10.3390/v12040373.

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Coxsackievirus B (CVB) is a common human enterovirus that causes systemic infection but specifically replicates to high titers in the pancreas. It was reported that certain viruses induce mitochondrial fission to support infection. We documented that CVB triggers mitochondrial fission and blocking mitochondrial fission limits infection. The transient receptor potential channels have been implicated in regulating mitochondrial dynamics; namely, the heat and capsaicin receptor transient receptor potential cation channel subfamily V member 1 (TRPV1) contributes to mitochondrial depolarization and fission. When we transiently warmed HeLa cells to 39 °C prior to CVB exposure, infection was heightened, whereas cooling cells to 25 °C reduced infection. Inducing “cold” by stimulating transient receptor potential cation channel subfamily M member 8 (TRPM8) with menthol led to reduced infection and also resulted in lower levels of mitochondrial fission during infection. Additionally, menthol stabilized levels of mitochondrial antiviral signaling (MAVS) which is known to be tied to mitochondrial dynamics. Taken together, this highlights a novel pathway wherein CVB relies on TRPV1 to initiate proviral mitochondrial fission, which may contribute to the disruption of antiviral immunity. TRPM8 has been shown to antagonize TRPV1, and thus we hypothesize that stimulating TRPM8 blocks TRPV1-mediated mitochondrial fragmentation following CVB exposure and attenuates infection.

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18

Hardani, Dian Nova Kusuma, Abi Aditya Triyanda, and Winarso Winarso. "Monitoring Stabilitas Transien Pada Sistem Tenaga Listrik." JRST (Jurnal Riset Sains dan Teknologi) 3, no. 2 (September 30, 2019): 69. http://dx.doi.org/10.30595/jrst.v3i2.4686.

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Kebutuhan listrik pada saat ini merupakan kebutuhan primer bagi masyarakat Indonesia, sehingga kualitas energi listrik yang baik harus dipenuhi. Perubahan beban yang bervariatif dapat berdampak pada kestabilan sistem. Jika terjadi peristiwa beban berlebih atau gangguan maka harus dilakukan pelepasan beban agar system tetap stabil. Peristiwa alih hubung pada rangkaian listrik dapat menyebabkan adanya sentakan tegangan dan arus yang disebut dengan arus transien. Pada penelitian ini, analisis perhitungan dan simulasi lepasnya pembebanan di Gardu Induk menggunakan perangkat lunak ETAP. Hal ini berguna untuk mengetahui seberapa stabil transien yang muncul akibat adanya pelepasan beban dan jumlah kerugian yang diakibatkan oleh gangguan tersebut. Berdasarkan hasil tersebut diperoleh tegangan pulih akibat transien sekitar 3 detik setelah terjadi pelepasan salah satu power grid Gardu Induk Kalibakal kemudian sekitar 0,2 detik saat pelepasan beban di feeder 11 dan 14. Hasil tersebut menunjukkan bahwa kestabilan transien pada sistem tenaga listrik di Gardu Induk Kalibakal masih dalam kondisi baik.

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19

Wang, Aiwen, Jian Li, Zhenhua Di, Xiangjun Tian, and Dongxiu Xie. "A New Reduced Stabilized Mixed Finite-Element Method Based on Proper Orthogonal Decomposition for the Transient Navier-Stokes Equations." Mathematical Problems in Engineering 2011 (2011): 1–19. http://dx.doi.org/10.1155/2011/895386.

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A reduced stabilized mixed finite-element (RSMFE) formulation based on proper orthogonal decomposition (POD) for the transient Navier-Stokes equations is presented. An ensemble of snapshots is compiled from the transient solutions derived from a stabilized mixed finite-element (SMFE) method based on two local Gauss integrations for the two-dimensional transient Navier-Stokes equations by using the lowest equal-order pair of finite elements. Then, the optimal orthogonal bases are reconstructed by implementing POD techniques for the ensemble snapshots. Combining POD with the SMFE formulation, a new low-dimensional and highly accurate SMFE method for the transient Navier-Stokes equations is obtained. The RSMFE formulation could not only greatly reduce its degrees of freedom but also circumvent the constraint of inf-sup stability condition. Error estimates between the SMFE solutions and the RSMFE solutions are derived. Numerical tests confirm that the errors between the RSMFE solutions and the SMFE solutions are consistent with the the theoretical results. Conclusion can be drawn that RSMFE method is feasible and efficient for solving the transient Navier-Stokes equations.

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20

Bruel, Charles, Remi Laraque, Sasha Omanovic, Sylvain Coulombe, and Gregory S. Patience. "Pt thin film transient mobility over yttria stabilized zirconia." Thin Solid Films 626 (March 2017): 17–24. http://dx.doi.org/10.1016/j.tsf.2017.01.060.

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21

Ansari, Shahab U., Masroor Hussain, Sarvat M. Ahmad, Ahmar Rashid, and Suleman Mazhar. "STABILIZED MIXED FINITE ELEMENT METHOD FOR TRANSIENT DARCY FLOW." Transactions of the Canadian Society for Mechanical Engineering 41, no. 1 (March 2017): 85–97. http://dx.doi.org/10.1139/tcsme-2017-1006.

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Darcy flow is a steady-state model for laminar flow of a fluid through a porous medium. The present work proposes an extended model of laminar Darcy flow by introducing dynamic pressure and velocity to the classical formulation. The solution of the proposed time-space model is attained by discretizing the problem with a stabilized mixed Galerkin method in space and a forward Euler method in time. The resulting matrix equation is well-posed and is solved using the conjugate gradient (CG) method. The error analysis of the numerical solutions confirms convergence to the actual model.

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22

Roy, Ronald A., Adam Calabrese, and Charles C. Church. "On the nucleation of transient cavitation from stabilized microbubbles." Journal of the Acoustical Society of America 87, S1 (May 1990): S141. http://dx.doi.org/10.1121/1.2027989.

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23

Esmaili, Masoud, Heidar Ali Shayanfar, and Nima Amjady. "Multi-objective congestion management incorporating voltage and transient stabilities." Energy 34, no. 9 (September 2009): 1401–12. http://dx.doi.org/10.1016/j.energy.2009.06.041.

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24

Apostolidou, Christina, and Michael Stamatoudis. "Transient Behavior of Drop Sizes in Stabilized Agitated Dispersions." Chemie Ingenieur Technik 63, no. 1 (January 1991): 66–68. http://dx.doi.org/10.1002/cite.330630116.

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25

Jin, Xianju, Jinsong Li, Yoshitaka Matsumura, Masaji Shinjo, Kouki Kasai, Sakurako Shimotakahara, and Hiroshi Kihara. "2P102 Euilibrium intermediate and transient intermediate of src SH3 and its mutant(Proteins-stability, folding, and other physicochemical properties,Oral Presentations)." Seibutsu Butsuri 47, supplement (2007): S138. http://dx.doi.org/10.2142/biophys.47.s138_3.

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26

Liu, Yajing, Jeffrey J. McGuire, and Mark D. Behn. "Aseismic transient slip on the Gofar transform fault, East Pacific Rise." Proceedings of the National Academy of Sciences 117, no. 19 (April 28, 2020): 10188–94. http://dx.doi.org/10.1073/pnas.1913625117.

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Oceanic transform faults display a unique combination of seismic and aseismic slip behavior, including a large globally averaged seismic deficit, and the local occurrence of repeating magnitude (M) ∼6 earthquakes with abundant foreshocks and seismic swarms, as on the Gofar transform of the East Pacific Rise and the Blanco Ridge in the northeast Pacific Ocean. However, the underlying mechanisms that govern the partitioning between seismic and aseismic slip and their interaction remain unclear. Here we present a numerical modeling study of earthquake sequences and aseismic transient slip on oceanic transform faults. In the model, strong dilatancy strengthening, supported by seismic imaging that indicates enhanced fluid-filled porosity and possible hydrothermal circulation down to the brittle–ductile transition, effectively stabilizes along-strike seismic rupture propagation and results in rupture barriers where aseismic transients arise episodically. The modeled slow slip migrates along the barrier zones at speeds ∼10 to 600 m/h, spatiotemporally correlated with the observed migration of seismic swarms on the Gofar transform. Our model thus suggests the possible prevalence of episodic aseismic transients in M ∼6 rupture barrier zones that host active swarms on oceanic transform faults and provides candidates for future seafloor geodesy experiments to verify the relation between aseismic fault slip, earthquake swarms, and fault zone hydromechanical properties.

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27

Stogov, A. Yu, and A. N. Belyaev. "IMPROVEMENT OF TRANSIENT STABILITY OF AUTONOMOUS POWER SYSTEM ON BASIS OF WIDE AREA CONTROL SYSTEM." Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 21, no. 1-2 (April 11, 2019): 55–66. http://dx.doi.org/10.30724/1998-9903-2019-21-1-2-55-66.

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Abstract: The coordinated generation and load control to increase transient stability level of oil- production enterprise autonomous power system with dominant motor load is studied in the paper. Mutual angle between voltage phasors at gas turbine plant bus and equivalent load node as well as slip difference of synchronous machines are used as input signals. It is shown that implementation of additional control allows to increase the level of transient stability by more than 40%. The combined coordination of power system stabilizer of synchronous generators and motors as well as gas turbine frequency control parameters is applied. The positive impact of power system stabilizer settings on post-accident conditions is proved by analysis of small signal stability.

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28

Bijang, Nathaniel L. "ANALISA WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN." JURNAL ILMIAH SAINS 12, no. 2 (January 4, 2013): 153. http://dx.doi.org/10.35799/jis.12.2.2012.741.

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ANALISA WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN ABSTRAK Kestabilan adalah kemampuan mesin sinkron dari sistem tenaga listrik untuk mencapai kondisi stabil pada kondisi operasi baru yang sama atau identik dengan kondisi sebelum terjadi gangguan. Umumnya analisa kestabilan terbagi dalam dua kategori yaitu kestabilan steady state yaitu analisa sistem untuk kembali ke kondisi stabil setelah mengalami gangguan kecil dan kestabilan transient yaitu analisa sistem untuk kembali ke kondisi normal/stabil setelah mengalami gangguan besar. Studi/analisa stabilitas sangat diperlukan saat perencanaan pembangkit dan transmisi. Analisa/studi stabilitas sistem tenaga listrik membantu untuk menentukan setting waktu on/off relai proteksi , waktu pemutusan kritis circuit breaker, level tegangan dan kapasitas transfer diantara sistem-sistem. Kata kunci: Mesin sinkron, stabilitas, waktu pemutusan kritis CRITICAL CLEARING TIME ANALYSIS ELECTRICAL POWER SYSTEM ABSTRACT The stability problem is concerned with the behavior of the synchronous machines after a disturbance. Transient stability studies are needed to ensure the system can withstand the transient condition following a major disturbance. Frequently,such studies are conducted when new generating and transmitting facilities are planned. The studies are helpful in determining such things as the nature of the relaying system needed, critical clearing time of circuit breakers, voltage level of, and transfer capability between systems. Keywords: Synchronous machine, stability, critical clearing time

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29

Bochev, Pavel B., Max D. Gunzburger, and John N. Shadid. "On inf–sup stabilized finite element methods for transient problems." Computer Methods in Applied Mechanics and Engineering 193, no. 15-16 (April 2004): 1471–89. http://dx.doi.org/10.1016/j.cma.2003.12.034.

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30

Vannier, Luc A., Chunxiang Yao, and František Tureček. "2-Deoxyribose Radicals in the Gas Phase and Aqueous Solution. Transient Intermediates of Hydrogen Atom Abstraction from 2-Deoxyribofuranose." Collection of Czechoslovak Chemical Communications 70, no. 11 (2005): 1769–86. http://dx.doi.org/10.1135/cccc20051769.

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A computational study at correlated levels of theory is reported to address the structures and energetics of transient radicals produced by hydrogen atom abstraction from C-1, C-2, C-3, C-4, C-5, O-1, O-3, and O-5 positions in 2-deoxyribofuranose in the gas phase and in aqueous solution. In general, the carbon-centered radicals are found to be thermodynamically and kinetically more stable than the oxygen-centered ones. The most stable gas-phase radical, 2-deoxyribofuranos-5-yl (5), is produced by H-atom abstraction from C-5 and stabilized by an intramolecular hydrogen bond between the O-5 hydroxy group and O-1. The order of radical stabilities is altered in aqueous solution due to different solvation free energies. These prefer conformers that lack intramolecular hydrogen bonds and expose O-H bonds to the solvent. Carbon-centered deoxyribose radicals can undergo competitive dissociations by loss of H atoms, OH radical, or by ring cleavages that all require threshold dissociation or transition state energies >100 kJ mol-1. This points to largely non-specific dissociations of 2-deoxyribose radicals when produced by exothermic hydrogen atom abstraction from the saccharide molecule. Oxygen-centered 2-deoxyribose radicals show only marginal thermodynamic and kinetic stability and are expected to readily fragment upon formation.

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31

Jauch, Clemens, and Tom Cronin. "Simulation Model of a Wind Turbine Pitch Controller for Grid Frequency Stabilisation." Wind Engineering 29, no. 4 (June 2005): 377–87. http://dx.doi.org/10.1260/030952405774857879.

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This paper describes a pitch angle controller that enables an active-stall wind turbine to dampen actively grid frequency oscillations. This builds on previous work in the area of the transient stability control of active-stall turbines. The phenomenon of grid frequency oscillations is explained briefly and then the task for the wind turbine controller defined. The pitch controller that acts as a grid frequency stabiliser is explained in terms of its layout, control sequence and parameters. Finally, a transient fault situation with subsequent grid frequency oscillations is simulated and it is shown how the grid frequency stabiliser works. The performance of the controller is discussed and the conclusion is drawn that grid frequency stabilisation with an active-stall turbine is possible under certain conditions.

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32

Ramadass, Gidugu Ananda, Narayanaswamy Vedachalam, Arunachalam Umapathy, Raju Ramesh, and Vandavasi Balanagajyothi. "Finite Element Analysis of the Influence of Ambient Temperature Variations on the Performance of Fiber Optic Gyroscope Sensing Coils." Marine Technology Society Journal 51, no. 1 (January 1, 2017): 16–22. http://dx.doi.org/10.4031/mtsj.51.1.2.

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AbstractTime transience-related nonreciprocal effect due to ambient temperature variations has significant influence in the bias stability performance of interference-type fiber optic gyroscopes (I-FOG). This paper presents the thermal finite element analysis (FEA) done on a 10-km-long I-FOG sensing coil wound with a diameter of 10 cm in a bipolar configuration for identifying its bias performance during ambient temperature variations. Results indicate that, with a sampling frequency of 0.5 kHz, the ambient temperature variation of 0.5°/min could degrade the bias stability performance of the I-FOG to tactical grade level, while maintaining ambient temperature variation within 0.01°/min is required to attain bias stabilities >0.001°/h, the performance required for the strategic grade applications. It is also identified that in a temperature stabilized environment, sensing coil with 10 and 40 layers requires a thermal stabilization time of about 9 and 26 min, respectively.

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33

M. Gajare, Atul, Dr R. P. Singh, and Dr M. U. Nemade. "Power System Stability Analysis of SMIB with FOPID using Cuckoo Search Optimized Differential Evaluation." International Journal of Engineering & Technology 7, no. 2.17 (April 15, 2018): 5. http://dx.doi.org/10.14419/ijet.v7i2.17.11551.

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Due to complexity in the power system there is always a loss of the stability due to the fault. Whenever a fault is intercepted in system, the whole system goes to severe transients. These transients cause oscillation in phase angle which leads poor power quality. The nature of oscillation is increasing instead being sustained, which leads system failure in form of generator damage. To reduce and eliminate the unstable oscillations one needs to use a stabilizer which can generate a perfect compensatory signal in order to minimize the harmonics generated due to instability.This paper presents a Power System stabilizer to reduce oscillations due to small signal disturbance. Additionally, a hybrid approach is proposed using FOPID stabilizer with the PSS connected SMIB. Cuckoo Search (CS) Optimized Differential Evaluation (DE) approach is used for the parameter tuning of the stabilizer. The efficiency of proposed approach is observed by rotor angle and power angle deviations in the SMIB system.

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34

Yue, Xu, Hong Liao, Huijun Wang, Tianyi Zhang, Nadine Unger, Stephen Sitch, Zhaozhong Feng, and Jia Yang. "Pathway dependence of ecosystem responses in China to 1.5 °C global warming." Atmospheric Chemistry and Physics 20, no. 4 (February 28, 2020): 2353–66. http://dx.doi.org/10.5194/acp-20-2353-2020.

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Abstract. China is currently the world's largest emitter of both CO2 and short-lived air pollutants. Ecosystems in China help mitigate a part of the country's carbon emissions, but they are subject to perturbations in CO2, climate, and air pollution. Here, we use a dynamic vegetation model and data from three model inter-comparison projects to examine ecosystem responses in China under different emission pathways towards the 1.5 ∘C warming target set by the Paris Agreement. At 1.5 ∘C warming, gross primary productivity (GPP) increases by 15.5±5.4 % in a stabilized pathway and 11.9±4.4 % in a transient pathway. CO2 fertilization is the dominant driver of GPP enhancement and climate change is the main source of uncertainties. However, differences in ozone and aerosols explain the GPP differences between pathways at 1.5 ∘C warming. Although the land carbon sink is weakened by 17.4±19.6 % in the stabilized pathway, the ecosystems mitigate 10.6±1.4 % of national emissions in the stabilized pathway, more efficient than the fraction of 6.3±0.8 % in the transient pathway. To achieve the 1.5 ∘C warming target, our analysis suggests a higher allowable carbon budget for China under a stabilized pathway with reduced emissions in both CO2 and air pollutants.

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Kalagnanam, Jayant R. "Controlling Chaos: The Example of an Impact Oscillator." Journal of Dynamic Systems, Measurement, and Control 116, no. 3 (September 1, 1994): 557–64. http://dx.doi.org/10.1115/1.2899253.

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The OGY algorithm (Ott et al., 1990) allows the conversion of a chaotic attractor to any one of a large number of periodic orbits by making small time-dependent perturbations of an available system parameter. We have applied this method to impact oscillators and stabilized its chaotic attractor on period-1 and period-2 orbits using small time-dependent pertubations of the driving frequency. We also demonstrate the ability to switch the chaotic system between the period-1 and period-2 orbits at will by controlled time-dependent perturbations. However, before the system settles on the stabilized orbit, it exhibits a long chaotic transient. We demonstrate how the exponential sensitivity of a chaotic system to small perturbations can be exploited to control the duration of this chaotic transient.

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Yasutra, Amega, and Calvin Orliando. "A Deliverability Method for Estimating Stabilized Gas Well Performance during Transient Periods on Unconventional Reservoir." Journal of Earth Energy Engineering 10, no. 1 (March 29, 2021): 18–31. http://dx.doi.org/10.25299/jeee.2021.5620.

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This study discusses the determination of the stabilized flow coefficient, C, in the Rawlins and Schellhardt equation. It is applicable in the reservoir with low porosity and permeability model, usually found in unconventional reservoirs. In determining the flow coefficient, a deliverability test method proposed by Hashem and Kazemi was used during the transient flow period of a gas well. Besides, in determining the deliverability exponent, n, used in the least squared analysis equation derived by Johnston and Lee in the determination of C stabilized so that from each value of n, there will be supporting data for determining stabilized flow coefficient. Finally, the application and previous method will determine the flow coefficient value based on reservoir model time stabilization. Later it compares with the John Lee equation and IPR constructs from the model and John Lee.

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Li, Ang. "Simulation and Application of Power System Stabilizer on Power System Transient Stability." Open Electrical & Electronic Engineering Journal 8, no. 1 (December 31, 2014): 258–62. http://dx.doi.org/10.2174/1874129001408010258.

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This paper introduces the working principle and the mathematical model of additional power system excitation control-Power System Stabilizer (PSS). Through established a typical single machine-infinite bus power system simulation model, we simulate the synchronous generator’s transient operational characteristics following a severe disturbance. The simulation results show that the PSS can not only effectively increase the system damping, but also improve operational characteristics of the generator, considerably enhance power system dynamic and transient stability.

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Kern, Frank. "Evidence of Phase Transitions and Their Role in the Transient Behavior of Mechanical Properties and Low Temperature Degradation of 3Y-TZP Made from Stabilizer-Coated Powder." Ceramics 2, no. 2 (April 3, 2019): 271–85. http://dx.doi.org/10.3390/ceramics2020022.

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The substance 3 mol% yttria stabilized zirconia (3Y-TZP) has become a commodity for the manufacture of components in biomedical and engineering applications. Materials made from stabilizer-coated rather than co-precipitated starting powders are known for their superior toughness and low temperature ageing resistance. The reason for this phenomenon is however still not fully understood. In this study, 3Y-TZP materials hot pressed at 1300–1450 °C for 1 h were characterized. It was found that at a sintering temperature of 1375 °C, a transition from fine grain to coarse grain microstructure associated with a shift from tough and ageing resistant to brittle and prone to ageing was observed. The detailed analysis of the phase composition by X-ray diffraction revealed that TZPs consists of up to five crystallographically different phases of zirconia simultaneously whose contents dynamically change with sintering temperature. At low sintering temperature, the predominant phases are a tetragonal phase with low yttria content and large domain size and high tetragonality together with a cubic phase of high yttria content. At high temperature, a tetragonal phase of higher yttria content and lower tetragonality is formed together with a cubic phase of lower yttria content.

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Genrich, J. F., and J. B. Minster. "Near‐real time reduction of shipboard gravity using Kalman‐filtered GPS measurements." GEOPHYSICS 56, no. 12 (December 1991): 1971–79. http://dx.doi.org/10.1190/1.1443008.

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We have developed a Kalman filter to estimate accurate Eötvös corrections and horizontal ship accelerations from Global Positioning System (GPS) fixes. High‐resolution shipboard gravity measurements are obtained with a newly designed, linear phase, Finite Impulse Response (FIR) low‐pass filter. Both filters are combined to yield accurate, near‐real time, Eötvös‐corrected underway gravity estimates. Error ranges that reflect uncertainty in navigation for these estimates are calculated from autocovariances of Kalman velocity estimates by means of variance propagation expressions for time‐invariant linear digital filters. Estimates of horizontal ship acceleration are combined with a simplified instrument impulse response model in an attempt to remove transient noise from the gravimeter output. We apply the technique to data collected by two shipboard gravimeters, a LaCoste & Romberg Model S Air‐Sea Gravity Meter and a Bell Aerospace BGM-3 Marine Gravity Meter System, operated side‐by‐side on the Scripps R/V Thomas Washington during Leg 1 of the Roundabout expedition. In the absence of significant horizontal accelerations due to course or speed changes, both instruments yield data with good repeatability, characterized by rms differences of less than 1 mGal. Horizontal accelerations generate transient signals that cannot be modeled at present to an accuracy of better than 5 mGal. Difficulties in removing these transients are primarily due to insufficient quantitative knowledge of the response of the instrument, including the gyro‐stabilized platform. This can be determined analytically or empirically.

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Brorson, James R., and Zachary B. Bulwa. "Two-State Kinetic Model of Rates of Stroke Recurrence in the POINT Study Population." Stroke 52, no. 4 (April 2021): 1446–49. http://dx.doi.org/10.1161/strokeaha.120.031447.

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Background and Purpose: Following an acute ischemic stroke or transient ischemic attack, 2 rates of stroke recurrence are suggested by data from trials of acute secondary prevention treatments: a transient rapid rate followed by a persisting slower rate of stroke. Methods: A kinetic model was constructed based on underlying vulnerable and stabilized states of patients following acute ischemic events related by fixed transition rates. Its predictions were fitted by nonlinear regression to the observed timing of outcome events in patients in the POINT trial (Platelet-Oriented Inhibition in New TIA and Minor Ischemic Stroke). Results: The modeled survivor function produced a close fit to the observed data. The model's predicted kinetic rates suggest that, among subjects in the control group, the event rate was 100-fold higher in the vulnerable state than in the stabilized state. Active treatment halved this rapid rate and had little effect on event rates in the stabilized state. If at least one-tenth of the study population began in the vulnerable state, the rate of transition from the vulnerable to the stabilized state was still faster, with a half-life of only 1 to 2 days. Conclusions: Examination of kinetics of stroke occurrence, and of the rates associated with modeled state transitions, may provide insights into the underlying pathophysiological events that are targets for acute secondary prevention of stroke.

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Essel, Jonathan T., Eric Boyer, Kenneth K. Kuo, and Baoqi Zhang. "TRANSIENT BURNING BEHAVIOR OF PHASE-STABILIZED AMMONIUM NITRATE BASED AIRBAG PROPELLANT." International Journal of Energetic Materials and Chemical Propulsion 11, no. 5 (2012): 473–86. http://dx.doi.org/10.1615/intjenergeticmaterialschemprop.2013005394.

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Liao, Meihong, Hui Liao, Jingjing Ye, Pengbo Wan, and Liqun Zhang. "Polyvinyl Alcohol-Stabilized Liquid Metal Hydrogel for Wearable Transient Epidermal Sensors." ACS Applied Materials & Interfaces 11, no. 50 (November 22, 2019): 47358–64. http://dx.doi.org/10.1021/acsami.9b16675.

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Codina, Ramon. "Stabilized finite element approximation of transient incompressible flows using orthogonal subscales." Computer Methods in Applied Mechanics and Engineering 191, no. 39-40 (August 2002): 4295–321. http://dx.doi.org/10.1016/s0045-7825(02)00337-7.

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Zhang, Tong, Zhiyong Si, and Yinnian He. "A stabilised characteristic finite element method for transient Navier–Stokes equations." International Journal of Computational Fluid Dynamics 24, no. 9 (December 2010): 369–81. http://dx.doi.org/10.1080/10618562.2010.535791.

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Schmidt, J., W. A. Wall, and E. Ramm. "Transient free surface flows via a stabilized ALE finite element method." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 80, S2 (2000): 547–48. http://dx.doi.org/10.1002/zamm.200008014143.

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Zhang, Hua, A. S. Dvornikov, and P. M. Rentzepis. "Photolysis of CBr4and Its Transient Solvent Stabilized (CBr3+//Br-)SolvIon Pair." Journal of Physical Chemistry A 109, no. 27 (July 2005): 5984–88. http://dx.doi.org/10.1021/jp050221x.

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Venkataramani, D., J. E. Smay, and C. P. Aichele. "Transient stability of surfactant and solid stabilized water-in-oil emulsions." Colloids and Surfaces A: Physicochemical and Engineering Aspects 490 (February 2016): 84–90. http://dx.doi.org/10.1016/j.colsurfa.2015.10.059.

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Jia, Hongen, Kaitai Li, and Songhua Liu. "Characteristic stabilized finite element method for the transient Navier–Stokes equations." Computer Methods in Applied Mechanics and Engineering 199, no. 45-48 (November 2010): 2996–3004. http://dx.doi.org/10.1016/j.cma.2010.06.010.

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49

Braack, Malte, Jens Lang, and Nico Taschenberger. "Stabilized finite elements for transient flow problems on varying spatial meshes." Computer Methods in Applied Mechanics and Engineering 253 (January 2013): 106–16. http://dx.doi.org/10.1016/j.cma.2012.08.006.

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50

Kelkar, M. G. "Estimation of Turbulence Coefficient Based on Field Observations." SPE Reservoir Evaluation & Engineering 3, no. 02 (April 1, 2000): 160–64. http://dx.doi.org/10.2118/62488-pa.

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Summary Isochronal testing is commonly used to evaluate the performance of gas wells. This paper proposes a new technique to estimate the value of the turbulence coefficient based on isochronal tests. The proposed method is easy to apply and evaluate. Further, the method also provides a value of bg under stabilized conditions which can be used to predict the performance of gas wells under stabilized conditions. The proposed method is validated using field data under a variety of operating conditions. The values of the turbulence coefficient based on the field data can differ significantly compared to the literature correlations. This further shows the importance of obtaining appropriate reservoir parameters based on the field rather than the laboratory data. Introduction The use of isochronal or modified isochronal testing is well established in the gas industry. These tests are common for gas wells which take a long time to reach a stabilized rate. A common example would be a low permeability, fractured reservoir. Instead of testing these wells until a stabilized rate is reached, the wells are tested for a fixed period of time and the bottomhole pressure is measured. For isochronal testing, the well is then shut in until it reaches a stabilized pressure and the procedure is repeated for a different rate. For modified isochronal testing, the well is shut in for a fixed period of time, and the shut-in pressure is measured at the end of that period. The procedure is then repeated at other rates. By repeating this procedure for different time intervals, we can gather information about rate vs. pressure drop in the formation for these time intervals. Ultimately, using this information, our goal is to establish an appropriate rate vs. pressure drop relationship under stabilized conditions. Two procedures are commonly used to establish the equation for rate vs. pressure drop. An empirical method states that q g = C ( p ￣ 2 − p w f 2 ) n . ( 1 ) We can write a simpler equation in terms of pseudo-real pressures as q g = C [ m ( p ￣ ) − m ( p w f ) ] n . ( 2 ) Under transient conditions, the value of C is not constant. Instead, we can write Eq. 2 as q g = C ( t ) [ m ( p ￣ ) − m ( p w f ) ] n , ( 3 ) where C(t) represents a term which is a function of isochronal interval t. In the literature, methods are proposed to estimate the value of C corresponding to the stabilized rate based on the transient state information ?C(t) For example, Hinchman et al.1 propose that 1/C(t)1/n be plotted as a function of log t, and the line be extrapolated until t is equal to the time it takes to reach the stabilized state period. In their method, they assume that n is constant, where n is an inverse of slope when log[m(p¯)−m(pwf)] is plotted as a function of qg. Although we get different straight lines corresponding to different t, the authors assume that the slopes are approximately constant. Another commonly used approach in analyzing isochronal tests is to use an equation, m ( p ￣ ) − m ( p w f ) = a g q g + b g q g 2 . ( 4 ) A similar equation can also be written in terms of pressure squared terms. Eq. 4 is derived starting from Forchheimer's equation. Under transient conditions, we can rewrite Eq. 4 as m ( p ￣ ) − m ( p w f ) = a g ( t ) q g + b g q g 2 , ( 5 ) where ag(t) is a function of isochronal interval, and bg is assumed to be constant. A commonly used technique is to plot ag(t) vs. log (t) and extrapolate ag(t) corresponding to a value of t which represents the time required to reach a stabilized rate.2–4 In using both Eqs. 3 and 5, we have assumed that the contribution due to the non-Darcy effect is not affected during the transient conditions. For example, in applying Eq. 3, we assume that n is constant during the transient period, and in applying Eq. 5, we assume that bg is constant during the transient period. Both n and bg represent the relative contributions of the non-Darcy flow. n will approach 0.5 as the non-Darcy effect becomes dominant, and bg becomes larger as the non-Darcy effect becomes significant. However, by assuming that n and bg are constant during the transient periods, we are ignoring the changes in the relative contributions due to the Darcy and non-Darcy terms. In this article, we extend the previous analysis to account for changes in the non-Darcy term during the transient period. Further, by proper analysis, we propose a method to estimate the value of the turbulence coefficient based on the evaluation of the transient period data. Approach In our approach, instead of using the empirical equation (Eq. 3), we will begin with Forchheimer's equation, where the pressure gradient in a radial reservoir is calculated by ∂ p ∂ r = μ g k v + β ρ g v 2 . ( 6 ) The permeability (k) of the reservoir may be established based on well test data or core information. The turbulence coefficient is difficult to estimate. Although literature correlations5,6 exist to calculate the value of ? based on the laboratory experiments, field evidence7 indicates that the ? values in the field are significantly greater than the laboratory experiments.

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