The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper a new approach of a shape-optimized piezoelectric MEMS generator for fluid-actuated energy scavenging is presented. Different energy scavenging scenarios are introduced. Depending on the specific load scenario optimum piezoelectric cantilever shapes are investigated. A point load at the free-end of a cantilever requires a triangular cantilever shape. Compared to a classical rectangular...
The main objective of this study was to identify if there is any change in wafer warpage after bevel clean process, which might lead to higher film stress at device area in further processes. Correlation between bevel film Etch Rate (ER) and wafer warpage was also investigated. 25 kA thermal oxides (Tox) were etched on back side with various thicknesses remaining to generate a different amount of...
With the example of the aluminum alloy complex extrusion, simulating the symmetrical curved process of complicated cross-section extrusion is successfully realized in the paper. The distribution of stress and strain and the variation of cross-section shape are analyzed in the roll bending process, and the dangerous spots are effectively determined in the forming. The simulation results indicated:...
Force regulation is a challenging task of forceps used for robot-assisted surgical manipulation. To avoid excessive force applied on soft tissues, sophisticated sensors with computerized precise control are often required. Without using additional electronic elements, this paper presents a passive mechanism to maintain a constant contact force between forceps jaw tips and tissues given a pre-specified...
anti-slide pile is the most commonly used and the most effective control technologies in Slope engineering. The current design theory is based on experiences not to consider soil arching effect, which made reasonable anti-slide pile spacing, is too small and cost is too high. In the paper, by the analysis of existing research results and the two arch-hinged arch optimal curves and instability arch...
According to prestress loss due to friction, several formulas that can be use to calculate pre-stressing tendon elongation are derived under the arrangement in straight line, circular curve or parabola layout in this paper, the solutions were proposed for different tensioning tendon and spatial pre-stressing tendon and we discussed the recurrent problems that existed in the calculation, especially...
Considering the interaction of building-soil-tunnel, the raft foundation masonry building vertical crossed by double-line parallel shield tunnel was simulated by 3D MIDAS/GTS software, and the impact of construction on the building was analyzed. The results show that: When the distance between double-line parallel shield tunnel axis and building axis was zero (L=0m), after the left-line had already...
As a purpose of developing micro-electric machines, transient behaviors of a nematic liquid crystal between two parallel plates are simulated with various parameters such as applied voltage, gap between the two plates, twist and tilt angles. When the twist anchoring angle is 0 degree, the induced velocity profile is anti-symmetric S-shaped profile. The velocity profile is symmetric for the case that...
This paper introduces the conditions of design loads and service performance of pedestrian suspension bridges at home and abroad, carries on detailed investigations and analysis of twenty mountainous villages' pedestrian suspension bridges in Guangyuan City of Sichuan Province, discusses design load standard value and load combinations, deflection-span ratio, dynamic characteristics etc. of the mountainous...
Crack is a main destroyed formation of high-intensity mining. Based on measured data, the difference between cracks caused by high-intensity mining and other mining methods had been studied. Control cracks showed obviously when using high intensity mining, and often gone with many small cracks. They always showed as couple, and the ground between them appeared as horst or rift valley, which destroyed...
This paper reports the optimum design, fabrication and characterization of a piezoelectric MEMS generator for fluid-actuated energy harvesting. Depending on the specific load scenario optimum beam shapes of piezoelectric cantilevers are investigated by theoretical estimations and related experiments. A point load at the free-end of a cantilever requires a triangular beam shape. Compared to a classical...
In Non Destructive Testing (NDT), the system to scan experiences mechanical and thermal constraints. The shape of crack in the system can not be predicted. A stochastic model for the shape of the crack has been combined with a numerical model based on the solution of the Maxwell equations in quasistatics using the finite element method. In these conditions, a Monte Carlo Simulation Method has been...
This paper describes experimental results using a scanning electron microscope (SEM) to observe the face of diamond-impregnated bit after its drilling engineering ceramic. Wear patterns and mechanisms were analyzed. The results show that several diamond wear patterns are found in the bit face including complete crystal shape, micro fragmentation, extensive fragmentation, whole fragmentation, wearing...
A novel gate-all-around raised source / drain sub-10-nm poly-Si nanowire (NW) channel TFTs with self-aligned corked gate structure (GAA RSDNW-TFTs) have been successfully demonstrated. It is through the use of a novel fabrication process requiring no advanced lithographic tools. The corked gate (CG) structure, only the poly gate pattern was etched, reduces complex of process significantly. For the...
Specification and target impose several limitations and difficulties in micro manipulators design. These obstacles are even more important when the target of microgripping is biological cells. Even though a variety of designs and solutions has been proposed in the literature, the problems of temperature at microgripper tip and applied voltage in gripping jaws are still unsolved. In this paper a new...
We present the Green's function for the scattering of SH waves by an elliptical cavity in an elastic half-space combining with the technique of conformal mapping and multi-polar coordinate system. Then we deduce the dynamic stress concentration factor (DSCF) around the oval cavity based on the Green's function. Numerical results are carried out by changing the position and the shape of the cavity,...
Cold-formed steel channel sections had been widely recognized as lightweight material and its application in construction industry seen to be unlimited because it has proven in minimizing the building cost while satisfying the required strength. This paper investigates the structural behavior of cold-formed steel channel columns (without or with stiffeners) subjected to axial thrust. Computer aided...
A coring rock sample test-bed is primarily used to drill the core with appropriate size for laboratory analysis. According to the design requirements, the structure of coring rock sample test-bed is designed. On the basis of the preliminary design, the test-bed model is created with the Solidworks. And then linear static analysis and model analysis are conducted with the finite element analysis software...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.