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where K = 0.454 + 0.41ν is the hardness coefficient, B is the ratio of the hardness H to the yield stress σ y, and ϕ is a dimensionless material parameter given by ϕ = σ y /E *.The reduced elastic modulus E * is given as E/(1 − ν 2), where E represents Young's modulus and ν is Poisson's ratio.. For a contact spot with its area smaller than a …
Frequent pattern (itemset) mining is one of the established approaches for knowledge discovery. Minimizing the number of database scans (I/O overhead) is a challenging task in Frequent itemset mining. Partition algorithm is one of the early novel approaches to reduce the database I/O overhead as compared to Apriori algorithm and …
Sadece kum ile ilave makro ve mikroelement besin takviyesi vererek de bitki bakılabilir. Birçok hobici arkadaşımız ticari olarak satılan taban besinlere para harcayıp satın aldığı ve tabanda kullandığı ürünlere alternatif olarak sizlere sunacağım taban kurulumunu defalarca kendi akvaryumlarımda ve civarımda hobi ile ...
1 Introduction. In the noncommutative case, there are several analogs of the representation of "almost everywhere" convergence. E.g., Lance [ 14] (see also [ 8 ]) has introduced the almost uniform convergence and Yeadon [ 20] has introduced the bilateral almost uniform convergence (see also [ 3 ]). In [ 8, 9 ], one can find long lists of ...
In the presence of network externalities, we examine the endogenous delegation structure in an import-competing market with import tariff under Bertrand competition. We show that (i) with strong network externalities, choosing delegation for home and foreign firms is a dominant strategy, which implies that the managerial …
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North Dakota Department of Mineral Resources North Dakota Geological Survey NORTH DAKOTA GEOLOGICAL SURVEY Street Address: 1016 E. Calgary Ave., Bismarck ND 58503 Mailing Address: 600 East Boulevard Avenue, Bismarck ND 58505-0840 Telephone: (701) 328-8000 FAX: (701) 328-8010 Office Hours: Monday - Friday, 8am-12pm and …
The Poly (3-hexylthiophene) (P3HT) is one of the most studied conjugated polymers that is suitable for organic solar cells. It has a high electrical conductivity and P3HT is a donor material and a p-type semiconductor [ 3 ], it has a high hole mobility sim 0.2 cm 2 /Vs [ 4] but remains lower than that of inorganic materials. P3HT has a low ...
North Dakota oil patch among top markets for Wisconsin sand. EAU CLAIRE, Wis. (AP) – After more than a decade of alternating boom-and-bust cycles, the regional frac sand industry appears to be stabilizing — at least for now. That's the assessment of UW-Eau Claire geology professor Kent Syverson, who also serves as a …
1 Starting Point. We are now going to build a classical theory of the dispersion of optical constants in a continuous medium. Again we start from Eq. ( 2.13 ), i.e., Newton's law of motion. In agreement to our assumptions made in Sects. 2.2 and 12.3, we assume the existence of charge carriers in the medium that are accelerated by external forces.
Example 21.4. 1: Emitted Photon. According to Bohr's theory two of the allowed orbits in the hydrogen atom have radii of 52.918 and 211.67 pm. Calculate the energy, the frequency, and the wavelength of the photon emitted when the electron moves from the outer to the inner of these two orbits.
Definitions. Height or elevation of a point P on the Earth's surface is the distance from P to a reference surface of zero height, measured along a precisely defined path. Different Height Systems result from the choice of the reference surface and the path from P to that surface. Vertical Datum is a surface of zero height, typically defined ...
This work was supported by NSF of China (Nos. 61872383, 61402524, 61872359 and 61602510). The work of Qun-Xiong Zheng was also supported by Young Elite Scientists Sponsorship Program by CAST (2016QNRC001) and by National Postdoctoral Program for Innovative Talents (BX201600188) and by China Postdoctoral …
3.1 Crack depth distribution. For crack growth simulation, a small semi-elliptical surface crack is assumed to exist on the inner pipe surface. Let the length on the surface and the depth of the initial crack be 2c and a, respectively.The length 2c and the depth a are assumed to follow certain statistical distribution functions. Given that the …
This note briefly reports on the applicability of the local-in-time (LT) adjoint-based method to a large-scale topology optimization problem with unsteady thermal-fluid. The basic idea of the LT method is to divide a time-dependent optimization problem into reasonable subproblems to reduce memory cost. We demonstrate that the proposed …
It takes at least (varOmega (nd)) steps to solve the stack rearrangement problem for a typical input instance, because most items must move at least once to get into place. In this section, we prove a stronger lower bound. We mention that similar bounds are described in [].We provide a more accurate bound for LSR here with a proof counting the …
SUMMARY. The horizontal-to-vertical spectral ratio (HVSR) of ambient noise measurement is commonly used to estimate a site's resonance frequency (|${f_0}$|).For sites with a strong impedance contrast, the HVSR peak frequency (|${f_{0,mat{ HVSR}}}$|) has been shown to be a good estimate of |${f_0}$|.However, the random …
In order to exclude some disturbing factors, let us introduce the ratio between a current point and a point (area) chosen as a reference and characterized by the effusivity e nd.The e/e nd ratio represents a straight line parallel to the time axis everywhere except time periods where subsurface defects appear in the temperature evolution. An …
In this work, we develop a topology optimization method for linear elastic contact problems with maximum contact pressure constraint. First, the Kreisselmeier–Steinhauser (KS) function is adopted as an aggregated measure of the maximum contact pressure over specific contact regions. Then, the maximum contact …
Logistic mixed effects model example data. The user must define provide the design matrix directly for use in hmclearn. Our first step is to load the data and store the fixed effect design matrix (mathbf {X}), random effects design matrix (mathbf {Z}), and dependent variable vector (y).
Hydraulic fracturing, also known as fracking, is a method of oil and natural gas extraction that involves injecting fluid into subterranean rock formations at high pressure. According to the U.S. Energy Information Administration (EIA), there were approximately 23,000 hydraulically fractured wells in the United States in 2000.