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With the rapid growth in the mobile industry, Package-on-Package (PoP) technology has been widely adopted for the 3D integration of logic and memory devices within mobile handsets and other portable multimedia products. The PoP solution offers significant advantages, including increased density through stacking logic and memory devices in the same formfactor and a high degree of flexibility for variable...
This paper presents the design and a novel rotor shape of a 3 kW, 25000 rpm permanent magnet assisted synchronous reluctance motor (PMa-SynRM) based on a low speed benchmark model. Multiphase PMa-SynRM can operate with low torque ripple, reduced magnet volume and extended field weakening region which makes it a potential candidate for high speed motor design. However, the challenge of high speed PMa-SynRM...
Short-term DC progressive-stress tests on 200 micron thick specimens of a commercial XLPE and its silica nanocomposite intended for DC use have shown that the DC nanocomposite has a considerably higher breakdown strength than the AC XLPE. However, constant-stress tests have shown that both the nanocomposite and the unfilled XLPE have similar lifetimes at medium fields of 125–175 kV/mm. There is also...
The paper is concerned with the analytical aspects of the structural optimization problems for elastic bodies in the unilateral contact with a given friction. The contact phenomenon is governed by the second order elliptic variational inequality. The aim of the topology optimization problem is to find such material density distribution function in a domain occupied by the body to minimize its normal...
A finite element model which contains one sixth of the IGBT module based on a real test chip of IGBT module is established to investigate the temperature and stress distribution of different shape bonding wire. The finite element (FE) analysis which coupled electro-thermal and thermal-mechanical are conducted using commercial software ABAQUS. The thermal performance and stress distribution of IGBT...
The influence of void distribution on the transverse mechanical properties of unidirectional composites is studied. Firstly, using Matlab to obtain composites microscopic voids radius distribution. Secondly, based on void radius distribution, the representative volume element (RVE) of composites microstructure with random fiber, matrix, and random voids are generated by random algorithm. Finally,...
This paper first investigates the challenging graph theoretic problem of constructing universally rigid tensegrity frameworks given any generic configuration. We design a numerical algorithm to construct a universally rigid tensegrity framework, such that the resulted eigenvalues of the stress matrix of the tensegrity framework can be selected beforehand. As one application, we then consider the formation...
The paper explains the relation between prosodic phrases and Information Structure (IS) by decomposing phrases into hierarchies of embedded contrast/communicative units (CUs). At any level of hierarchies, CUs contains IS partitions supported by two contrasted functional constituents. The functional categories are defined by using a two level IS model. Topic-Focus and CU_predicate-CU_argument are the...
In recent years, the Z-bending process was rarely investigated, especially for the asymmetrical Z-shape bending process. This causes the lacks of understanding on bending mechanism and spring-back characteristics and results in the difficulty in die design and process control for the spring-back characteristics. In the present research, therefore, the wiping asymmetrical Z-bending process was examined...
Ultrafast lasers in association to beam shaping have shown to be excellent candidates for transparent material processing [1]. Non-diffractive solutions such as Bessel beams allows for precise energy deposition since they are robust to undesired non-linear effects and as they do not distort along the propagation [2]. This offers important opportunities in laser-assisted cleaving, i.e. mechanical medium...
The Russian Arctic shelf area belongs to the strategic areas of the country with an enormous potential of natural resources, particularly, the hydrocarbons reserves. Against the background of a growing interest in the development of the Arctic region, in particular, its offshore fields, a topical problem of the Arctic fleet selection and optimization appears. Therefore, there is a need for research...
The resonance frequencies and mode shapes of aPCB are highly depended on form factor and stack-up. Moreover, the interaction with components mounted to the PCB cannot a priori be neglected. In the search for key parameters that might impact the outcome of a board level vibration test, it is important to asses the impact of these factors on the principal PCB vibrational characteristics. The resonance...
We present an experimental method for the modeling and system identification of shape memory alloy-based (SMA) wire actuators, employing minimum-variance adaptive tuning and control to find the parameters of a proposed modified Preisach model. The material compositions of SMAs have inherent properties that induce phase transformations between austenitic and detwinned martensitic crystal structures,...
As chip makers move to advanced nodes and device geometries shrink, design and production costs have risen rapidly. As a result, it has become increasingly critical to reduce costs in established technology nodes by increasing device yield. For a given process, differences in individual process chambers can lead to process variations that may have a large impact on both overlay control and yield management...
Torsion links are components which couple inner and outer cylinders of a landing gear mechanism. They prevent torsion or twisting between the cylinder and piston components in the structure. The integrity of this component is essential to prevent shimmy vibrations in an aircraft landing gear. Failure of this component is thus catastrophic for the aircraft. The typical geometry of torsion link of a...
This research focuses on revealing the effect of size and shape of Ag particles for mechanical properties of no-pressure sintered Ag by using micro-compression test. Specimens were fabricated by focused ion beam with the dimension of 5 μm × 5 μm × 15 μm. The stress-strain curve suggested that the sintered Ag subjected a stable elastic deformation and a large plastic deformation. The mechanical properties...
Through via formation is definitely the key for coming the advanced packaging which includes heterogeneous integration and high speed wireless communication. Glass and fused silica are well known as a great candidate for a core material for high frequency application as a result of high bulk resistance and lower dielectric loss. One of the important subjects in order to use through glass vias (TGV)...
Warpage of semiconductor packaging substrate during or after manufacturing processes has been a serious issue in the electronics industry. We found that the packaging substrate, which has initial warpage at room temperature, changes its warpage orientation by flipping from a concave to a convex cylindrical shape during the thermal processing. In this paper, we demonstrate that the rotation of warpage...
Transition from planar MOSFETs to FinFETs enabled scaling beyond 28nm node. At 5nm/3nm design rules, a transition from FinFETs to nanowires has to be evaluated. We explore with rigorous NEGF (Non-Equilibrium Green's Functions) and sub-band Boltzmann transport models the impact of nanowire shape and SiGe/Si cladding layers on its performance and variability. Outside of the nanowire channel, a “bottleneck”...
This paper focuses on the comparison of red blood cell (RBC) deformability under continuous and repetitive loadings. We utilized a feedback position-control system and a narrow microfluidic channel for applying different deformation patterns on RBCs. According to the analyses of shape recoveries with different patterns, we found, for the first time, that the mechanical responses of RBCs upon continuous...
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