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Impedance Spectroscopy: a Practical Guide to Evaluate Parameters of a Nyquist Plot for Solid Polymer Electrolyte Applications
Published in Chin Hua Chia, Chin Han Chan, Sabu Thomas, Functional Polymeric Composites, 2017
Siti Rozana Bt. Abdul Karim, Chin H.A.N. Chan, Lai H.A.R. Sim
From the plot in Figure 5.12(b), the peak of the Z″ curve is marked and identified as Z″max. After which, a horizontal line and a vertical line are drawn parallel to the x- and y-axes, respectively. The point of intersection between the vertical line and the x-axis is given the symbol (fo) which is the frequency at which the Z″ value reaches Z″max. On the other hand, the y-intercept between the y-axis and the horizontal line is equal to Rb/2. The frequency fo and the value of Rb/2 are presented in Figure 5.12(a). From the procedure described above, it is crucial for one to get the exact value of Z″max in order to determine the Rb value more precisely. The procedure to locate the exact position of Z″max on the peak of the Z″ curve is explained in detail in the next section.
Focused Beam Acoustic Microscopy
Published in J. David, N. Cheeke, Fundamentals and Applications of Ultrasonic Waves, 2017
Lamb wave lens [18]. As described in Section 19.3.1, the higher-order Lamb modes can be excited at characteristic angles given by sin θ = V0/VP for different values of plate phase velocity VP. Atalar has developed a lens where the central part emits at normal incidence and the outside part at a constant angle θ. If the lens is placed in a defocused position above the plate to be studied as the frequency is swept, various Lamb modes become excited as the above condition becomes satisfied. It becomes useful to create a V(f) curve in analogy to the V(z) curve.
DeepCOVID-19: A model for identification of COVID-19 virus sequences with genomic signal processing and deep learning
Published in Cogent Engineering, 2022
Emmanuel Adetiba, Joshua A. Abolarinwa, Anthony A. Adegoke, Tunmike B. Taiwo, Oluwaseun T. Ajayi, Abdultaofeek Abayomi, Joy N. Adetiba, Joke A. Badejo
However, the Z-Curve and tetrahedron mapping methods capture the base composition and distribution of any given sequence quantitatively thereby possessing rich visualization advantage (Kwan & Arniker, 2009). Whereas the base composition provides the total content of each base in a sequence and can be determined easily; the base distribution is more difficult to determine, but provides a better discrimination amongst various genes, even if the base composition are the same. Earlier studies have established Z-Curve and tetrahedron as the “rgb” transformation of DNA sequences (Abo-Zahhad et al., 2012), with Z-Curve “RGB” images having a marginal discriminatory edge over tetrahedron “RGB” images (Adetiba et al., 2015). Thus, the study at hand leverages Z-Curve mapping to generate “RGB” images for alignment-free identification vis-à-vis classification of the sequences of MERS-CoV, SARS-CoV and SARS-CoV-2.
Analysis of rock-socketed piles loaded in axial compression in Mumbai region based on load transfer characteristics
Published in International Journal of Geotechnical Engineering, 2019
R. U. Kulkarni, D. M. Dewaikar
In Figure 1, an axially loaded pile is shown which is discretised into n number of elements. The t–z curve for the weathered stratum and the socket material and the q–z curve for the rock base are derived based on O’Neill and Hassan’s (1994) non-linear hyperbolic criterion (Zhang 2004). The empirical relationships for limit point resistance and socket skin friction are adopted using Kulkarni and Dewaikar’s (2016) criteria. The chart reported by Cole and Stroud (1977) is adopted to estimate limit side shear in the weathered stratum. The load-settlement response is obtained based on the following step-by-step procedure (Kiousis and Elansary 1987).Discretise pile into n elements as shown in Figure 1.Assume a small displacement, wn, at the tip of the nth element.Estimate unconfined compressive strength, σcm of the rock mass (Zhang 2010).
Seismic Vulnerability Assessment of Pile-Supported Wharves Using Fragility Surfaces
Published in Journal of Earthquake Engineering, 2022
Mohsen Soltani, Rouhollah Amirabadi
The soil–pile interaction was modeled as Winkler plastic springs, as suggested by the American Petroleum Institute (API) (2000), and the shear and tangential interaction between piles and soil layers were modeled as p-y and t-z curves. A q-z curve was used for the end bearing capacity. The kinematic hysteresis model was used to define the viscous damping for the plastic springs. Once the model was constructed, a series of fiber hinges were applied to the piles that interacted with the surface slope and connected to the deck. The properties of the pre-stressed concrete and soil materials are shown in Tables 1 and 2.