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Model tests on rock slopes prone to wedge sliding and some case histories from recent earthquakes
Published in Ömer Aydan, Takashi Ito, Takafumi Seiki, Katsumi Kamemura, Naoki Iwata, 2019 Rock Dynamics Summit, 2019
Each wedge base block was fixed on the shaking table to receive same shaking with the shaking table during the dynamic test. The accelerations acting on the shaking table, at the base and wedge blocks were recorded during the experiment, and saved on a data file as digital data (Fig. 2). Furthermore, in the second series of dynamic tests, a laser displacement transducer was used to record the movement of the wedge block during the experiments. The reason for recording accelerations at three different locations is to determine the acceleration at the moment of failure as well as any amplification from the base to the top of the block. In fact, when the amplitude of input acceleration wave is increased, there is a sudden decrease on the wedge block acceleration records during the wedge failure, while the others are increasing. A barrier was installed at a distance of 20-30 mm away from the front of the wedge block to prevent their damage by falling off from the base block.
A Ground-Penetrating Radar Study of Peat Landforms in the Discontinuous Permafrost Zone Near Fort Simpson, Northwest Territories, Canada
Published in Carl C. Trettin, Martin F. Jurgensen, David F. Grigal, Margaret R. Gale, John K. Jeglum, Northern Forested Wetlands, 2018
Inez M. Kettles, Stephen D. Robinson
The pattern of radar returns near the contact between frozen peat plateau and unfrozen collapse scar (Figure 6), however, differs markedly from those obtained at the peat plateau–fen interface shown in Figure 5. Deep reflectors between 39 and 50 m exhibit characteristics (lower frequency and fairly continuous) more typical of unfrozen fen than frozen peat plateau (Figures 4 and 5). Additionally, the gently rising reflector between 3 and 4 m depth (unfrozen scale) appears similar to the reflector that marks the base of peat in the adjacent, unfrozen, collapse scar fen. These observations suggest a thin, near-surface wedge of perennially frozen peat near the plateau edge. The wedge pinches out toward the fen, with the wedge base being represented by reflector R2. Also, the lowest continuous reflector, representing the flat-lying base of peat (P-b), is gradually “pulled-up” between positions 39 and 50 m as the wedge of frozen peat thickens and increases the signal velocity. Vertical thaw interfaces between landforms were also noted by Tarnocai (1973) and Zoltai and Tarnocai (1975). A similar pattern of peat plateau thermal degradation was noted along the Hudson Bay railway in the discontinuous permafrost zone in northern Manitoba (Hayley, 1988).
Electrical components
Published in Joe Cieszynski, David Fox, Electronics for Service Engineers, 2012
Filament lamps are employed in electronic equipment for panel illumination, indication, or decoration. Miniature lamps are available in a wide variety of voltages ranging from very low, in the order of 3 V, to high, around 130 V. The range includes different physical construction and fitting. Some common types are: Miniature Edison Screw (MES), Lilliput Edison Screw (LES), Miniature Bayonet Cap (MBC), Flanged, and Wedge base. These are illustrated in Figure 11.7.
Design reviews on a multipurpose power sockets for different applications
Published in Cogent Engineering, 2018
Chin jie Wong, Umar Nirmal, Sharmeeni Murugan
A tungsten halogen lamp was invented by Westlund, Palmer, Audesse, and Huston (1974). This halogen lamp has an aluminosillicate glass envelope with wedge base. The coil of wire used is molybdenum wires that passing through a pinch seal. The unstabilized tungsten coil filament are supported by clamp at each end. The lamp is filled with an inert gas, such as argon, nitrogen, krypton, or a mixture of halogen additive such as bromine, for example, in the form of hydrogen bromide. The lamp can also include a getter made from tantalum wire to be secure in the base pinch seal (Westlund et al., 1974). Figure 28 shows the sectional view of this tungsten halogen lamp.
Effect of triangular cross-sectional transverse wedge on the performance of an inline tube bundle heat exchanger
Published in Experimental Heat Transfer, 2023
Pasada Yisunzam, Anusorn Chinsuwan
TEF increases continuously with the wedge base () to height () ratio or aspect ratio (). Form0.275, 0.550, 0.758 to 1, TEF increases continuously from 1.157 to 1.84, 1.11 to 1.72, 1.05 to 1.42 and 1.02 to 1.39 for x/L = 1/3, 2/3, 1 and 0, respectively.