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Micro fluidized bed is a promising reactor for a variety of industrial processes. It is important to understand the hydrodynamics of gas-solid fluidization of the micro fluidized beds with different oblique angles. This study numerically investigated the effects of oblique angle on the fluidization behavior and pressure drop in the micro fluidized beds by Computational Particle-Fluid Dynamics (CPFD)...
In this paper, a novel flicker-free ac/dc LED driver without electrolytic capacitor is presented. The driver comprises a single-stage boost-forward converter and a bidirectional buck-boost converter, which serves to bypass the low frequency ripple. Therefore, electrolytic capacitor is no longer needed. Compared with other electrolytic capacitor-less topologies, the proposed driver has the advantages...
A size-dependent model of a micro-electromechanical system (MEMS) actuated by both electrostatic and piezoelectric forces is proposed based on the modified couple stress theory. The governing equation and boundary conditions are derived with the help of the Hamilton principle and solved numerically by employing the Galerkin method and Newton downhill method. A material length scale parameter (MLSP)...
Based on the test structures and silicon measurement data done at 40nm technology, we analyze the impact of varying length between the contacted active-area and gate (S) on the performance of NMOS dogbone devices, such as saturation drain current (Idsat), threshold voltage (Vth), and leakage current (Ioff). The experiments show that as the length between the contacted active area and gate (S) is increased...
With piezoelectric layers attached, the electrostatically actuated microbeam-based MEMS (Micro-Electro-Mechanical Systems) is modelled to study the pull-in instability based on a modified couple stress theory. The nonlinear differential governing equation and boundary conditions of the beam are derived by using Hamilton's principle. The results show that the piezoelectric layers can decrease the pull-in...
Some research of Internet of Things in online garment recommendation concentrates on collecting information of customer and garment without enough quantitative analysis on how comfortable people feel, which would make little contributions to personalized decisions about the size selection. In order to recommend the best garment size and help the producers to improve the design and production according...
The paper reports compare of reliability between the chip scale package in MEMS devices with internal support structures and those without internal support structures in shock environments. We choose two kinds of chip scale packages of MEMS devices that meet requirements of analysis and experimental. By means of experiments, we obtained two kinds of chip scale packages structural parameters. And we...
In this paper, the thrust type rolling fatigue tests for case-hardened steel disks treated by normal shot peening technique with a shot of 0.6mm and fine particle peening technique with a shot of 0.05mm are done, respectively. The surface hardness and the surface compressive residual stress of the steel disks are increased by the peenings. On the other hand, the surface roughness and the D value of...
The tunnel is already an important component in traffic construction. We mainly use new Austrian tunneling method to design tunnel, and it aimed at "timely support" timely feedback measurement data required to determine reasonable supporting time [1]. Due to the tunnel construction in a closed working space, geological complex and changeable, only through the engineering analogy method to...
In order to research on the impact of water sump under seam floor. by mining 93upper10 working face in Nantun Coal Mine, numerical simulation and theory study are carried out in this paper. In the theoretical study, from the failure pattern of coal floor, criterion is put forward, that is whether the water sump is affected or not is existed in the overlap with floor failure, based on “down three zone”,...
Based on the finite element theory, taking a suspension footbridge for example, it is used the finite element analysis software called MIDAS/Civil builded bridge element model to carry out the static analysis, to research the influences of different sag-to-span ratio and the constrained way between the cable and the tower on static behavior of suspension. The results showed that, the cable stress...
Fatigue - one of the major mechanical failure, has caught more and more attention in vehicle reliability study. Fatigue test results of vehicles are usually discrete, which is caused mostly by the user's conditions. It is considered the user's real purpose in the test, which can help the users to develop or design a suitable testing program, improve the test run quality and shorten the product development...
Based on the background of Sijiaying open-pit mine, using the information of the mining having been exposed and the engineering geologic investigation, the stability of six programs of the feasibility of slope angle has been analyzed by using the finite-difference program FLAC software. Optimal slope angle program obtained by analyzing is following: the upper part slope angle is 47°, the lower part...
This paper gives a detailed investigation on TSOP warpage mechanism. The influences of all the factors on warpage behavior, including materials (EMC ingredient and lead frame), lead frame design and assembly process, were investigated through numerical simulation and experimental study. The simulation result showed that low CTE material is a good choice for warpage reduction. And it also indicated...
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