Thematische Bibliographien / Parametr K(t)

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Auswahl der wissenschaftlichen Literatur zum Thema „Parametr K(t)“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 2. Februar 2022

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Zeitschriftenartikel zum Thema "Parametr K(t)"

TABUCHI, Toshiaki, Takashi SOEDA, Terushige KAWATA und Mitsuru SOEDA. „Parameter Estimation of ARMA Process by Taking into Consideration of ^|^part;kx(t)/^|^part;^|^alpha;T^|^middot;^|^epsilon;(t)“. Transactions of the Society of Instrument and Control Engineers 24, Nr. 4 (1988): 357–62. http://dx.doi.org/10.9746/sicetr1965.24.357.

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Petzschner, Frederike H., Irene P. Ponce, Martin Blaimer, Peter M. Jakob und Felix A. Breuer. „Fast MR parameter mapping using k-t principal component analysis“. Magnetic Resonance in Medicine 66, Nr. 3 (09.03.2011): 706–16. http://dx.doi.org/10.1002/mrm.22826.

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Chuan-Hui, N., und S. Xiao-Bao. „Grüneisen parameter of lithium, sodium and potassium at T=298 K“. Journal of Physics and Chemistry of Solids 62, Nr. 7 (Juli 2001): 1359–61. http://dx.doi.org/10.1016/s0022-3697(01)00007-5.

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Deshmukh, Mangesh R., Ganesh M. Bansode und Pallavi Mahajan. „EVALUATION OF POTATO CULTIVAR FOR GROWTH AND YIELD PARAMETER“. World Journal of Biology and Biotechnology 3, Nr. 1 (15.04.2018): 203. http://dx.doi.org/10.33865/wjb.003.01.0138.

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The present investigation on evaluation of varietal performance of various potato varieties under Pune Conditions was initiated in Oct 2012. Potato tubers of Kufri Lauvkar, Kufri Badshah, Kufri Pushkar, Kufri Surya, Kufri Khyati, Kufri Ashoka, Kufri Jyoti, Kufri Pukharaj were planted on ridges and furrows. The results revealed that Kufri Surya recorded significantly higher total tuber yield (20.67 t/ha) followed by Kufri Pukharaj (18.45 t/ha). However percent plant emergence and foliage senescence were found non-significant. Whereas results in respect of yield depicted that the variety Kufri Lauvkar produced the lowest tuber yield of 16.23 t/ha. Tuber dry matter (19.69%) was recorded to be the highest in Kufri Surya which was significantly superior in comparison to the remaining varieties. The least incidence of late blight (9.69%) was recorded on Kufri Khyati which was at par with K. Surya (9.74%). The least incidence of early blight (10.29%) was recorded on K. Lauvkar which too was at par with K. Surya. Keeping this in view K. Surya may be recommended as promising variety for Pune region

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Mukherjee, Somnath. „Some Studies on K-essence Lagrangian“. International Journal of Innovative Research in Physics 2, Nr. 2 (01.01.2021): 9–14. http://dx.doi.org/10.15864/ijiip.2202.

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K-essence Lagrangian is studied in the context of an early universe epoch when t → 0. Equation of state parameter ω < −1 as well as deceleration parameter q0 < −1, indicates an accelerated expansion of the universe at an early epoch of time driven by negative pressure generated by dark energy.

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Kristoffel, N., und T. Örd. „The Pseudogap and Superconductivity Order Parameter Fluctuations“. International Journal of Modern Physics B 12, Nr. 29n31 (20.12.1998): 3106–9. http://dx.doi.org/10.1142/s0217979298002155.

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The influence of superconductivity unequilibrium order parameter correlated fluctuations on the normal phase elementary excitations have been investigated. Correspondingly a fluctuating source of pairs appears in the effective Hamiltonian described using the Gaussian free energy functional. A pseudogap (E g ) is found on the Fermi surface decreasing with rising temperature. It is scaled with the parameter α = ∊ F /k B T c . For smaller α-s E g develops more over T c . In non-high-T c systems and overdoped high-T c compounds the pseudogap is suppressed.

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Li, Guo, Li Li und Peng Zhu. „Galloping Control for Iced Conductors Using Tuned Mass Dampers with Fixed Time-Delayed Feedback“. Shock and Vibration 2019 (27.02.2019): 1–9. http://dx.doi.org/10.1155/2019/4823457.

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A tuned mass damper with fixed time-delay feedbacks (TTMD) is first applied to suppress galloping of iced conductors. It is different from general time-delay feedback control, which also connects an added mass to a galloping body and can absorb vibrational energy. The two-degrees-of-freedom model captures the essential mechanical behaviors of iced conductors with TTMD undergoing galloping. The harmonic balance method is then employed to obtain the approximate analytical solutions of the system. Particularly, the expressions of galloping amplitude and angle frequency were obtained. Then the influence regulations of the time-delay parameter T and strength parameter K on galloping control are fully analysed. The results show the added fixed time-delay feedback control can promote the TTMD’s effect, when suitable time-delay parameter T and strength parameter K are chosen. Moreover, the response amplitude and natural frequency change periodically with time-delay parameter T. With strength parameter K increasing, the response amplitude increases or decreases for a fixed value of T and the TTMD’s effect can be enhanced.

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Ye, Wen Ming, Xu Teng Hu, Wan Lin Guo und Ying Dong Song. „Three Dimensional Criterion for Creep Crack Propagation in C(T) Specimen“. Applied Mechanics and Materials 853 (September 2016): 142–47. http://dx.doi.org/10.4028/www.scientific.net/amm.853.142.

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Experimental of two kinds of compact tension (CT) specimens’ creep crack propagation are carried out in this paper. Traditional fracture mechanics and three-dimensional fracture theory are compared and the results show that: The K-Tz two-parameter model can eliminate the thickness-effect on the crack growth rates in the relatively low K range, however when K exceed certain values the effect of thickness for crack growth rates still exists; The Ct and Ct-Tz model can describe the thickness-effect of creep crack growth rates in regions of high Ct; When the crack tip stress intensity factor K of the two kinds of thickness (B=5 mm, B=10 mm) specimens equal to 35 and 31 respectively, this material’s creep crack growth control parameter change from K to Ct.

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Tseng, Jimmy. „Eisenstein series and an asymptotic for the K-Bessel function“. Ramanujan Journal 56, Nr. 1 (08.04.2021): 323–45. http://dx.doi.org/10.1007/s11139-020-00358-8.

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AbstractWe produce an estimate for the K-Bessel function $$K_{r + i t}(y)$$ K r + i t ( y ) with positive, real argument y and of large complex order $$r+it$$ r + i t where r is bounded and $$t = y \sin \theta $$ t = y sin θ for a fixed parameter $$0\le \theta \le \pi /2$$ 0 ≤ θ ≤ π / 2 or $$t= y \cosh \mu $$ t = y cosh μ for a fixed parameter $$\mu >0$$ μ > 0 . In particular, we compute the dominant term of the asymptotic expansion of $$K_{r + i t}(y)$$ K r + i t ( y ) as $$y \rightarrow \infty $$ y → ∞ . When t and y are close (or equal), we also give a uniform estimate. As an application of these estimates, we give bounds on the weight-zero (real-analytic) Eisenstein series $$E_0^{(j)}(z, r+it)$$ E 0 ( j ) ( z , r + i t ) for each inequivalent cusp $$\kappa _j$$ κ j when $$1/2 \le r \le 3/2$$ 1 / 2 ≤ r ≤ 3 / 2 .

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Ludwig, Donald. „Estimation Techniques for Distributed Parameter Systems (H. T. Banks and K. Kunisch)“. SIAM Review 33, Nr. 3 (September 1991): 486–87. http://dx.doi.org/10.1137/1033115.

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Dissertationen zum Thema "Parametr K(t)"

Kokeš, Miroslav. „Porovnání metod pro identifikaci poruch valivých ložisek“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442447.

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The aim of this master thesis is the comparison of selected methods and parameters for roller bearings diagnostics. Selected statistical parameters are kurtosis, crest factor, and parameter K(t). The other selected methods are envelope analysis, cepstral analysis, and ACEP method. These methods are implemented in LabVIEW software and compared based on noise resistance, computation speed, and overall capability of identifying roller bearing faults.

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Schmidt, Sarah J., Erika L. Wagoner, Jennifer A. Johnson, James R. A. Davenport, Keivan G. Stassun, Diogo Souto und Jian Ge. „Examining the relationships between colour, T eff , and [M/H] for APOGEE K and M dwarfs“. OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621724.

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We present the effective temperatures (T-eff), metallicities, and colours in Sloan Digital Sky Survey (SDSS), Two Micron All Sky Survey, and Wide-field Infrared Survey Explorer filters, of a sample of 3834 late-K and early-M dwarfs selected from the SDSS Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectroscopic survey ASPCAP (APOGEE Stellar Parameters and Chemical Abundances Pipeline) catalogue. We confirm that ASPCAP T-eff values between 3550 < T-eff < 4200 K are accurate to similar to 100 K compared to interferometric T-eff values. In that same T-eff range, ASPCAP metallicities are accurate to 0.18 dex between -1.0 <[M/H]< 0.2. For these cool dwarfs, nearly every colour is sensitive to both T-eff and metallicity. Notably, we find that g - r is not a good indicator of metallicity for near-solar metallicity early-M dwarfs. We confirm that J - K-S colour is strongly dependent on metallicity, and find that W1 - W2 colour is a promising metallicity indicator. Comparison of the late-K and early-M dwarf colours, metallicities, and T-eff to those from three different model grids shows reasonable agreement in r - z and J - K-S colours, but poor agreement in u - g, g - r, and W1 - W2. Comparison of the metallicities of the KM dwarf sample to those from previous colour-metallicity relations reveals a lack of consensus in photometric metallicity indicators for late-K and early-M dwarfs. We also present empirical relations for T-eff as a function of r - z colour combined with either [M/H] or W1 - W2 colour, and for [M/H] as a function of r - z and W1 - W2 colour. These relations yield T-eff to similar to 100 K and [M/H] to similar to 0.18 dex precision with colours alone, for T-eff in the range of 3550-4200 K and [M/H] in the range of -0.5-0.2.

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Alt, Hans-Marian Rücker Thomas Wabbel Thomas. „Ableitung von Regeln zur Optimierung der PAC-Parameter z, k und t in mehrstufigen PAC-gesteuerten Produktionssystemen mit einem und mehreren Endprodukten /“. 2005. http://www.gbv.de/dms/ilmenau/abs/509129633alt.txt.

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Bücher zum Thema "Parametr K(t)"

Kachelriess, Michael. Cosmological models for an homogeneous, isotropic universe. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802877.003.0020.

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The universe is homogeneous and isotropic on sufficiently large scales. The metric which describes such a space-time is derived and it is shown that it is determined by the scale factor a(t) and the parameter k distinguishing between hyperbolic, flat, or spherical 3-spaces. The Friedmann equations, which describe the time evolution of these models, are derived and specific models are discussed.

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Ryazantsev, Sergey, Tamara Rostovskaya, Olga Vorobyeva, Alexander Zubko, Mehdi Afzali und Timur Miryazov. Аtlas of socio-demographic development of Russia and Iran / S. V. Ryazantsev, T. K. Rostovskaya, O. D. Vorobyeva [et al.]; FCTAS RAS. – M.: Perspectiva Publishing, 2020. – 136 p. Perspectiva Publishing, 2020. http://dx.doi.org/10.38085/978-5-905-790-46-1-2020-1-136.

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The Atlas of the Socio-Demographic Development of Russia and Iran is a comprehensive scientific and practical publication that presents a cartographic model of cross-country comparisons of the socio-demographic development of the states. The model helps to obtain information about the main parameters of the socio-demographic situation in comparison with similar indicators, as well as to analyze the main trends of the socio-demographic development of the state and society. The Atlas is addressed to scientists, civil servants, social workers, teachers, graduate students, students (demographers, sociologists, political scientists, economists), as well as anyone interested in the socio-demographic development of Russia and Iran. The Atlas was prepared within the framework of the federal target program «Research and Development in Priority Areas of Development of the Scientific and Technological Complex of Russia for 2014–2020», approved by the Decree of the Government of the Russian Federation on May 21, 2013 No. 426, to the I Russian-Iranian sociological forum (Moscow, November 16–18, 2020).

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Buchteile zum Thema "Parametr K(t)"

Wang, Sujing, Na Zhang, Mingfang Sun und Chunguang Zhou. „The Analysis of Parameters t and k of LPP on Several Famous Face Databases“. In Lecture Notes in Computer Science, 333–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21524-7_40.

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Gräfe, Wolfgang. „The Separation of the Semi-infinite Model and the Calculation of the Surface Parameters for the Three-Dimensional body at T = 0 K (Regula Falsi of Surface Theory)“. In Quantum Mechanical Models of Metal Surfaces and Nanoparticles, 25–34. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19764-7_5.

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„Script-, Function-Files and Program Managing“. In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 67–91. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7078-4.ch003.

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The Editor window for writing scripts and user-defined functions are presented, as well as the Live Editor window for writing live scripts and functions. All commands, regular and live scripts, and functions are explained by examples from the mechanics and tribology (M&T) fields. After that, the application examples are given; they include the stress unit converters, computing of the stress factor of a shaft with a transverse hole, gear warm K-parameter calculations, installation, and operation stresses on the piston ring.

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Martinho Simões, José A., und Manuel Minas da Piedade. „Kinetics in Solution“. In Molecular Energetics. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195133196.003.0019.

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The main equations used to extract thermochemical data from rate constants of reactions in solution were presented in section 3.2. Here, we illustrate the application of those equations with several examples quoted from the literature. First, however, recall that the rate constant for any elementary reaction in solution, defined in terms of concentrations, is related to the activation parameters through equations 15.1 or 15.2. Equation 15.1 yields the enthalpy and the entropy of activation respectively from the slope and the intercept of a ln(k/T) versus 1/T plot (an Eyring plot). Equation 15.2 leads to the Arrhenius activation energy and the frequency factor, respectively, from the slope and the intercept of a ln k versus 1/T plot (an Arrhenius plot). All the parameters refer to the mean temperature of the plot, and Δ‡Ho is related to Ea by equation 15.3. Finally, recall that if the activation parameters are available for the forward (subscript 1) and the reverse (subscript −1) reaction, the enthalpy of this reaction is calculated by equation 15.4. In the preceding chapter on equilibrium in solution, it was pointed out that any analytical method suitable for determining equilibrium compositions of a reaction mixture at several temperatures can be used to obtain the enthalpy and entropy of that reaction. A similar statement can be made here: Any analytical method suitable for monitoring concentration changes with time at several temperatures can be used to derive the activation parameters of a reaction. Therefore, the analytical techniques used in equilibrium experiments are also applied in nonequilibrium (kinetics) studies. However, in this case, the choice of the analytical method will have an additional and important restriction, for it must consider the reaction rate. An instrumental technique suitable for determining the concentration of a given species under equilibrium conditions may be inappropriate for determining a fast concentration change of the same species.

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„Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists“. In Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists, herausgegeben von Neil P. Rude, David C. Glover, William D. Hintz, Shawn C. Hirsrst, Wayne E. Herndon, Rob B. Hilsabeck und Gregory W. Whitledge. American Fisheries Society, 2017. http://dx.doi.org/10.47886/9781934874462.ch45.

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Abstract.—Accurate estimates of growth and mortality are important for management of recreational fisheries. Accurate age estimates often require the sacrifice of fish; thus, assessments of growth and mortality rates of trophy fishes such as Muskellunge Esox masquinongy often lack sufficient data. Mark–recapture history can be used as a nonlethal alternative to estimate growth and mortality in fishes. To determine the utility of this approach, we used data from a 17-year Muskellunge mark–recapture program conducted on two Illinois reservoirs (Kinkaid Lake and North Spring Lake). Von Bertalanffy parameter estimates by sex, lake, and tag type (passive integrated transponder and T-bar anchor tags) were obtained using a novel modification of the Fabens growth model and compared to von Bertalanffy growth estimates using known- or scale-aged fish. Mortality was calculated using both age- and length-based methods. Fabens growth model estimates of asymptotic length (L∞) and growth coefficient (K) were within 6% (≤62 mm) and 23% (≤0.11) of corresponding von Bertalanffy growth model parameter estimates from known- or scale-aged fish by lake and sex. Provided that all sizes of fish are sampled, 4 years of mark–recapture data with more than 100 recaptures were found to be sufficient to produce reliable parameter estimates. Growth parameters differed between male fish tagged with passive integrated transponder or T-bar anchor tags but did not differ by tag type for females. Differences in Muskellunge growth and mortality rates between the two study lakes suggest that changing from a regionally applied minimum length limit to lake-specific minimum length limits may be warranted. Our results highlight the feasibility of mark–recapture data as a nonlethal technique to estimate population-specific growth and mortality rates for Muskellunge and the potential value of this approach in facilitating lake-specific Muskellunge management.

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„A Metric for Parametric Approximation T. Lyche and K. M0rk e n“. In Curves and Surfaces, 327–34. A K Peters/CRC Press, 1994. http://dx.doi.org/10.1201/9781439863596-37.

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Gutakovskis, Viktors, und Vladimirs Gudakovskis. „Performance Assessment of the Thermodynamic Cycle in a Multi-Mode Gas Turbine Engine“. In Gasification [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97458.

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This chapter discusses the direction of development of promising multimode aviation gas turbine engines (GTE). It is shown that the development of GTE is on the way to increase the parameters engine workflow: gas temperatures in front of the turbine (T*G) and the degree of pressure increase in the compressor (P*C). It is predicted that the next generation engines will operate with high parameters of the working process, T*G = 2000–2200 K, π*C = 60–80. At this temperature of gases in front of the turbine, the working mixture in the combustion chamber (CC) is stoichiometric, which sharply narrows the range of stable operation of the CC and its efficiency drops sharply in off-design gas turbine engine operation modes. To expand the range of effective and stable work, it is proposed to use an advanced aviation GTE: Adaptive Type Combustion Chamber (ATCC). A scheme of the ATCC and the principles of its regulation in the system of a multi-mode gas turbine engine are presented. The concept of an adaptive approach is given in this article. There are two main directions for improving the characteristics of a promising aviation gas turbine engine. One is a complication of the concepts of aircraft engines and the other one is an increase in the parameters of the working process, the temperature of the gases in front of the turbine (T*G) and the degree of increasing pressure behind the compressor (π*C). It is shown how the principles of adaptation are used in these areas. The application of the adaptation principle in resolving the contradiction of the possibility of obtaining optimal characteristics of a high-temperature combustion chamber (CC) of a gas turbine engine under design (optimal) operating conditions and the impossibility of their implementation when these conditions change in the range of acceptable (non-design) gas turbine operation modes is considered in detail. The use of an adaptive approach in the development of promising gas turbine engines will significantly improve their characteristics and take into account unknown challenges.

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„Exploratory Data Analysis“. In Spatial Analysis Techniques Using MyGeoffice®, 112–36. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3270-5.ch006.

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Exploratory data analysis (EDA) tries to summarize datasets main characteristics such as nearest neighborhood indexes, standard deviation, scatterplots or quadrat analysis. This EDA chapter is divided into several sections to cover myGeoffice© options not forgetting the graphical mode when facing outputs: file data input (after all, any analysis demands data); Descriptive study of the variable (mean, kurtosis, distribution plot, etc.); 2D-3D data posting (spatial location of the data samples); Cutoff layout map (a spatial colorful plot according to the data samples values that are higher and lower against any particular threshold); G and Kipley's K Index (to disclose clustered, uniform and random space sampling); Kernel Gaussian density (a non-parametric way to estimate the probability space density function of a variable); T-Student and F-tests (a parametric approach to check statistical differences between two sub-regions), including a brief section regarding the two-way ANOVA technique; Quadrat analysis (comparison of the statistically expected and actual counts of objects within spatial sampling areas to test randomness and clustering); XX profile scatterplot (silhouette view of the data along XX axis); and YY profile scatterplot (silhouette view of the data along YY axis).

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Parlance, J. Y., und T. S. Steenhuis. „Soil Properties and Water Movement“. In Vadose Zone Hydrology. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195109900.003.0008.

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For all spatial scales, from pore through local and field, to a watershed, interaction of the land surface with the atmosphere will be one of the crucial topics in hydrology and environmental sciences over the forthcoming years. The recent lack of water in many parts of the world shows that there is an urgent need to assess our knowledge on the soil moisture dynamics. The difficulty of parameterization of soil hydrological processes lies not only in the nonlinearity of the unsaturated flow equation but also in the mismatch between the scales of measurements and the scale of model predictions. Most standard measurements of soil physical parameters provide information only at the local scale and highlight the underlying variability in soil hydrological characteristics. The efficiency of soil characteristic parameterization for the field scale depends on the clear definition of the functional relationships and parameters to be measured, and on the development of possible methods for the determination of soil characteristics with a realistic use time and effort. The soil’s hydraulic properties that affect the flow behavior can be expressed by a soil water retention curve that describes the relation between volumetric water content, θ(L3L3), and soil water pressure, h(L), plus the relation between volumetric water content and hydraulic conductivity, K(L/T). In the next section, the determination of soil hydraulic parameters is first discussed for local and field scale. Then, we show how the pore-scale processes can be linked to soil hydraulic properties. These properties are then used in some of the modern methods that use integral and superposition solutions of Richards’ equation for infiltration and water flow problems for both stable and preferential types of flows. Finally, some practical aspects for watersheds are discussed to highlight the difficulties encountered when large-scale predictions are needed.

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„Black Bass Diversity: Multidisciplinary Science for Conservation“. In Black Bass Diversity: Multidisciplinary Science for Conservation, herausgegeben von Travis R. Ingram und John M. Kilpatrick. American Fisheries Society, 2015. http://dx.doi.org/10.47886/9781934874400.ch15.

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Abstract.—The largest native population of Shoal Bass Micropterus cataractae inhabits the Flint River, Georgia and remains relatively unstudied. We examined demographic characteristics of the population in the lower Flint River that is bounded by reservoirs during 2009–2011. We anchor tagged 741 Shoal Bass to evaluate the percentage of caught fish that were harvested. Shoal bass (n = 187) were sacrificed for age and growth analysis. Ages of sampled fish ranged from age 1 to 11. Von Bertalanffy growth parameter estimates were L∞ = 564 mm, K = 0.312, and t0 = –0.089. Male and female growth rates were similar, with the mean Shoal Bass requiring 2.4 years to reach 305 mm and 5.1 years to reach 457 mm. Growth rates of Shoal Bass were greater than those of previously studied populations and Largemouth Bass M. salmoides in the Flint River and an impoundment bounding the upper end of the study site. Annual total pooled mortality was 49%. Forty-one percent of caught Shoal Bass were harvested by anglers (range 31–60%). Our results suggest that with current population characteristics, an increase in the minimum length limit would not increase yield to the recreational fishery.

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Konferenzberichte zum Thema "Parametr K(t)"

Moreira, Felipe C., und Gustavo H. B. Donato. „Estimation Procedures for J and CTOD Fracture Parameters Experimental Evaluation Using Homogeneous and Mismatched Clamped SE(T) Specimens“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25804.

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Experimental evaluation of geometry-dependent material’s fracture resistance using constraint-designed SE(T) specimens has proved to be an accurate option to assess the structural integrity of pipelines and pressure vessels reducing excessive conservatism. In this context, this work presents procedures for experimental J-integral and CTOD (δ) evaluation using the eta (η) method applied to tension clamped SE(T) specimens made of homogeneous materials and also containing mismatched joints. Initially, the conceptual background is presented, followed by the description of the refined non-linear finite element models developed, which provide the necessary evolution of load with increased load-line displacement and crack mouth opening displacement. As results, are presented a variety of η factors for J -integral and CTOD calculations, which are not available in current standardized procedures. The main objective is to allow fracture resistance experimental evaluation using specimens of different a/W-ratios, material flow properties, weld joint configurations and levels of weld strength mismatch. The main motivation is the possibility of enhancing accuracy of pressure vessels and piping integrity assessments, since these later present very close fracture conditions if compared to SE(T) specimens. The present results, when taken together with previous developments, extend the knowledge about the use of clamped SE(T) specimens. The reader should enhance the studies about the topic with the complimentary paper with the same title beginning but involving pin-loaded SE(T) specimens.

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de Oliveira, Gabriel P., und Gustavo H. B. Donato. „Estimation Procedures for J and CTOD Fracture Parameters Experimental Evaluation Using Homogeneous and Mismatched Pin-Loaded SE(T) Specimens“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25796.

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Experimental evaluation of geometry-dependent material’s fracture resistance using constraint-designed SE(T) specimens has proved to be an accurate option to assess the structural integrity of pipelines and pressure vessels reducing excessive conservatism. In this context, this work presents procedures for experimental J-integral and CTOD (δ) evaluation using the eta (η) method applied to tension pin-loaded SE(T) specimens made of homogeneous materials and also containing mismatched joints. Initially, the conceptual background is presented, followed by the description of the refined non-linear finite element models developed, which provide the necessary evolution of load with increased load-line and crack mouth opening displacement. As results, are presented η factors for J-integral estimation and CTOD calculations, which are not available in current standardized procedures. The main objective is to allow fracture resistance experimental evaluation using specimens of different a/W-ratios, material flow properties, weld joint configurations and levels of weld strength mismatch. The main motivation is the possibility of enhancing accuracy of pressure vessels and piping integrity assessments, since these later present very close fracture conditions if compared to SE(T) specimens. The present results, when taken together with previous developments, extend the knowledge about the use of pin-loaded SE(T) specimens. The reader should enhance the studies about the topic with the complimentary paper with the same title beginning but involving clamped SE(T) specimens.

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Oh, Chang-Young, Tae-Kwang Song und Yun-Jae Kim. „An Estimation of C(t) of Transient Creep Under Combined Mechanical and Thermal Stresses“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25372.

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In this paper, a prediction of C(t), a crack tip parameter for the transient creep condition, for the circumferential cracked pipe under combined mechanical and thermal stresses are presented. The estimation formulae for C(t)-integral of the cracked component operating under mechanical load alone have been provided for decades [1–6]. However, high temperature structures usually work under combined mechanical and thermal load. And the interactions between mechanical and thermal loads make the relaxation rate different from those produced under mechanical load alone. In this study, 3-dimensional finite element analyses are conducted to calculate the C(t)-integral under combined mechanical and thermal load. As a result, redistribution time for the crack under combined mechanical and thermal load is re-defined to quantify the C(t)-integral. The estimation of C(t)-integral using this proposed redistribution time agrees well with FE results.

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Shen, Guowu, William R. Tyson, James A. Gianetto und Dong-Yeob Park. „Effect of Side Grooves on Compliance, J-Integral and Constraint of a Clamped SE(T) Specimen“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25164.

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The effect of side grooves on crack mouth opening displacement (CMOD) compliance, distribution of J-integral and crack-tip constraint parameters Q and A2 along the thickness of a clamped single-edge-notched tension (SE(T)) specimen were studied by finite element analysis (FEA). Focus was on the effect of depth of side grooves on J-integral and constraint parameters Q and A2 for shallow and deep cracks. The 3-D results were compared with those of SE(T) specimens in plane strain. The results show that the effective thickness equation used in ASTM E 1820 to evaluate compliance of side-grooved SE(B) and C(T) specimens can be used for clamped SE(T) specimens with reasonable accuracy. The results also suggest that the depth of the side grooves affects the distribution of the J-integral: the highest J-integral is at the center of the thickness for a SE(T) specimen with side grooves equal to or less than 10% of total thickness, and near the root of the side grooves for side grooves greater than 10% for a deeply-cracked specimen when the applied load P≥PY. The FEA results also show that the depth of side grooves affects the distribution of the constraint parameters: the crack-tip constraint is highest at the center of the thickness for a specimen with 0% side grooves (plain-sided), and near the root of the side grooves for side grooves equal to or greater than 10%. It was also found from FEA that the crack-tip constraint of a SE(T) specimen with 20% side grooves with shallow (a/W = 0.2) or deep (a/W = 0.5) crack is higher than that of a SE(T) specimen with the same crack depth in plane strain. As a result, the J-resistance of a SE(T) specimen with 20% side grooves may be lower than that of the same specimen in plane strain.

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Mehmanparast, A. N., C. M. Davies und K. M. Nikbin. „Validation of the K and J Parameters in a Compact Tension Specimen Containing Intergranular and Straight Crack Paths“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25281.

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Methods have been examined to evaluate the fracture mechanics parameters J and K in finite element (FE) analyses on a compact tension, C(T), geometry using a mesh appropriate for the evaluation of both intergranular and transgranular microstructural damage processes. Realistic grain and grain boundary microstructures were modelled using ABAQUS. Both straight and deviating crack profiles were considered, representing transgranular and intergranular crack growth processes, respectively. Elastic and elastic-plastic finite element analyses were performed on a C(T) specimen model with a standard straight and deviating crack profile to derive and compare the stress intensity factor, K, and J parameter values under plane stress and plane strain conditions. Considerations as to the validity of the J domain integral calculations that ABAQUS computes are discussed. It has been found that the values of K and J obtained from FE simulations are consistent with theoretical solutions and the stress distribution ahead of the crack tip is very close to that of expected from analytical studies for the case of a straight fronted transgranular crack. Reasonable values of K and J parameters could also be achieved from the FE contour integral values of a deviating crack when the contours selected were adequately far from the crack tip. However, significant differences were found between the analytical and FE contour integral values of a deviating crack when the crack growth direction was considered to continue at the angle defined by its grain boundary. The values of J obtained by from the load line displacement measurements were uninfluenced by the crack profile and in good agreement with other analytical solutions.

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Yazdani Nezhad, Hamed, und Noel P. O’Dowd. „Prediction of Transient Creep Response Under Combined Primary and Secondary Loading“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25272.

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Residual stress effects on creep deformation and fracture play a significant role in structural integrity assessments of engineering components. The focus of the current work is to investigate creep behaviour of mechanically loaded cracked structures in the presence of residual stress fields. Finite-element analyses have been carried out on single edge notch bend, SEN(B), and tension, SEN(T), specimens at different residual stress and mechanical stress levels. The redistribution time and associated stress relaxation for combined primary and secondary (residual) stresses have been determined (from the finite-element analysis) and interpreted using the transient fracture mechanics parameter, C(t). The observed trends are consistent with earlier studies involving combined thermal and mechanical stress.

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Matiyev, A. Ch, und R. T. Uspazhiev. „INFLUENCE OF POLYTYPY ON PHASE TRANSITIONS IN TlGaSe2 CRYSTALS“. In «АКТУАЛЬНЫЕ ВОПРОСЫ СОВРЕМЕННОЙ НАУКИ: ТЕОРИЯ, ТЕХНОЛОГИЯ, МЕТОДОЛОГИЯ И ПРАКТИКА». Международная научно-практическая онлайн-конференция, приуроченная к 60-ти летию член-корреспондента Академии наук ЧР, доктора технических наук, профессора Сайд-Альви Юсуповича Муртазаева. Crossref, 2021. http://dx.doi.org/10.34708/gstou.conf..2021.76.13.002.

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It is shown that, in the C-polytype of TlGaSe2 crystals, the structural PT, which occurs at a temperature of T ~ 108 K, is accompanied by an abrupt change in the value of the parameter c (∆c ~ 0.004 Å). For the 2C-TlGaSe2 polytype, the c (T) dependence shows only one clearly pronounced maximum at the temperature Tc2. Moreover, at temperatures that are T1 ~ 30 K higher and T2~ 5 K below Tc2, the Curie-Weiss law is fulfilled. The absence of a fourfold increase in the parameter from the unit cell for 2C-TlGaSe2 samples in the temperature range T = 100-300 K indicates that spontaneous polarization is the order parameter of the ferroelectric PT

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Gentry, R., und Y. Nemerson. „THE ACTIVATION OF PROTHROMBIN: A LINKED REACTIVE KINETIC MODEL“. In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643932.

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Prothrombin activation by factors Xa and Va is complex, involving five linked reactions occurring either in a bulk fluid phase or in a local phospholipid (PL) surface phase, each controlled by both the fundamental energetics of the species interactions and the relevant reactant concentrations. The significance of each reaction and in particular the kinetic efficiency of the PL surface reactions is yet to be resolved. Previous essentially Michaelis-Menten kinetic treatments of prothrombin activation have been derived without concern for the kinetic influence of the order of reactant assembly or possible nonlinear effects induced by complex trapping of reactants, as observed in factor VIIa reactions (Nemerson and Gentry, Biochem. (1976) 25, 4020). We propose a general model to analyze and explain this and similar PL associated coagulation reactions. The mathematical model consist of a system of nonlinear first order differential equations:dX/dt - F(X(t),C(t),K); dC/dt - G(X(t),C(t),K), where the functionals F and G are derived from standard kinetic principles. To model prothrombin activation in this general setting the fluid and bound reactions are described by two parallel but linked systems, denoted S1(X,C,K) and S2(X*,C ,K*), respectively. In the linked relationship the primary constituents transfer between the systems, governed by a transfer component -T, resulting in a system of “linked-reactive” equations of the form:dX/dt = -F(X, C, K) - T ; dX*/dt = F*(X*,C*,K*) + T* , etc. A key consideration is to ensure that the concentrations of reactive species are relative to the reactive volume in which the kinetic interactions are to occur. The detailed equations for prothrombin activation involve for the bulk phase three primary variables X1, X2, and X3 corresponding to factors Va, Xa, and prothrombin, four complexes, Ci, and a duplicate stared set for the PL phase. After condensation the resultant system of 11 differential equations involves 28 kinetic parameters; this has significant implications for the ability to uniquely identify the parameters but poses no difficulties for its use as a predictive model via its numerical simulation for specific parameter values.

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Yin, Shengjun, Paul T. Williams, Terry L. Dickson und B. Richard Bass. „Applicability of (K, T-Stress) Methodology to Analyze RPV Under Thermal-Hydraulic Transients“. In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26845.

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The (K, T-stress) methodology developed by Gao and Dodds [1] is being utilized to introduce crack front plasticity with constraint effects when plastic deformation occurs in structures, for example, when the Reactor Pressure Vessels (RPVs) are subjected to thermal-hydraulic loadings. One crucial step in this procedure is to quantify combinations of flaw geometries and loading conditions (transient sequences) that illustrate the limits of applicability of the two-parameter (K, T-stress) advanced fracture methodology relevant to integrity analyses of RPVs subjected to normal and emergency operating conditions. Numerical analyses were conducted to determine the limits of applicability of (K, T-stress) advanced fracture technology for RPV under thermal-hydraulic loadings. The numerical results indicate that the (K, T-stress) methodology captures the constraint condition of the RPV with typical embedded flaws under a postulated dominant thermal-hydraulic transient.

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Bray, D. P., R. J. Dennis und M. C. Smith. „Prediction of Welding Residual Stresses, Crack Initiation and Creep Crack Driving Forces C(t) Within a Continuous Finite Element Solution“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25699.

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The work reported in this paper investigates the manufacture, through-life operation and cracked behaviour of an attachment weld in a UK AGR boiler. A structural assessment of the attachment weld was performed to demonstrate its integrity. This assessment made use of complex finite element analysis of both the welding process and postulated defects. A simulation of the welding process was performed in order to predict the residual stresses and hardened material state throughout the attachment weld. The welding simulation was performed in two stages since a butter weld was deposited prior to the attachment weld itself. The accumulation of creep damage was predicted during steady normal operating conditions for the lifetime of the component. A contour map of creep damage was used to postulate the location and size of hypothetical single and double edge surface cracks within the weld. These postulated cracks were then explicitly introduced into the finite element model. The crack tip stress parameter C(t) was evaluated in order to predict the creep crack driving forces. The results from a cracked body simulation suggested that the creep crack driving force C(t) reduces as the crack grows, due to relief of the dominant welding residual stresses. The residual stress, creep damage and cracked body simulations have been brought together into a novel continuous finite element solution. The results can be used to support a safety case for continued operation of existing plant.

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