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Relatively little is known about the performance of the doped Ball Grid Array (BGA) packages used in semiconductor industries, even though newer products are widely being introduced to the market. This work experimentally investigates the doping effects of the BGA packages with SAC 305 alloys, caused by the vibration loading. This experiment focuses on the vibration fatigue life of 15 mm CABGA packages...
The Anand constitutive model has emerged as a popular method to describe the inelastic deformation behavior of Sn-Pb solders and, more recently, to describe the behavior of lead-free solders in electronic assemblies, mainly due to its effective description of constitutive behavior and high compatibility with finite element modes. Heretofore, although plenty of experimental and theoretical works have...
This paper presents novel functional surface designed for collecting water vapor, which is combined of PDMS and the micro level hydrophilic metal alloy ball. To imitate biological structure, the metallic balls are designed as hydrophilic part and PDMS substrate as hydrophobic structure. The ball is used as nucleation centers to absorb water vapor in the air to form droplet. Then, with the drop gradually...
Nanoionic based resistive switching memory cells are nowadays being implemented in novel memory technology known as Conductive Bridging Random Access Memory. These memory cells, known as programmable metallization cells, are a promising memory technology not only due to their scaling potential but also because of characteristics such as non-volatility, low-power operation and speed. Resistance switching...
Many of flat rolled products manufacturers are never subjected to a batch annealing practice. Prime high volume examples are AlMnMg (3004, 3014) and AlMg4.5Mn (5182) families of alloys and the similar is used for deep drawn products. If the exit temperature of the last hot rolling pass is high that the material self-anneals, which promotes to form the earing 45° from the earing 90° of the hot rolling...
In order to improve quality of oily metal waste for recycling materials disposed from metalworking factories, the degreasing system plays an important role. It is necessary to introduce the system in municipal and industrial waste management. In this paper, an energy consumption of a practical circulation-type superheated steam degreasing system was used for oily metal waste, which was disposed from...
Uncontrolled electrostatic discharge (ESD) sources may cause unpleasant experiences as well as more serious hazards to health. We have observed surprisingly high energy ESD sources in the hospital environment. These findings are analyzed and discussed in this article. In addition, electrostatic attraction and charge relaxation of materials for medical purposes are studied and solutions are proposed.
We propose a new design of bi-anisotropic meta-waveguide exhibiting topologically protected edge mode which can be guided around sharp corners without external magnetic field. The geometry is very simple and easy to be experimentally implemented.
The surface properties of an object and the environment in which it is located are important for robot grasping and manipulation. Physical contact with an object using tactile sensors can enable the retrieval of detailed information about the object, i.e. compressibility, surface texture and thermal properties. This paper describes a system that classifies materials based on their thermal properties...
A measurement technique to estimate dilute concentrations (1–5%) of metal inclusion in an inert dielectric is presented. Bulk permittivity of polymer metal composites with aluminium powder (1–5%) in epoxy indicated very small variation for the dilute mixtures. Reflection measurements from composites with small variation in bulk permittivity, Δε≈1 indicated an appreciable change in phase. Experimental...
The work presents feasibility study of theoretical concept, connecting semiconductor metal oxide chemistry and its gas sensor properties on the nanocrystalline SnO2 example. It is shown, that materials surface chemistry simultaneous modification by metal oxide structure dopants and deposition of catalytic components on the surface can be made in order to alter both gas molecule adsorption and conversion...
An innovative approach of sensitive and selective detection of trace amounts of chemical threat agents is presented in this work. The technology deals with semiconductor metal oxide gas sensors as a means of express gas detection, coupled with pre-sampling system, which is to improve sensitivity and selectivity of analysis. Examples for H2S, DMMP (phosphor-organic weapons simulant) and UDMH (highly...
With the rapid progress in science and technology, the human society advances from industrial society to post-industrial society. People pay more and more attention to the role of information. Objective demand for information greatly stimulates the development of information technology, such as TCM Literature and Database, and global information network has been set up quickly. Information resources...
The traditional English teaching mode has many shortcomings, which seriously affects the teaching effect. Multimedia English teaching model based on network can make up for its shortage to some extent. The foundation of this teaching mode is the multimedia courseware that adapts to the current requirements. So, the study of network multimedia courseware has an important practical significance and...
Al/Ta2O5/Pt RRAM cell was successfully demonstrated with stable bipolar switching. Band alignment for the structure of Al/Ta2O5/Pt was obtained using high-resolution X-ray photoelectron spectroscopy to investigate resistance switching behavior. Hole barrier heights of Ta2O5 on metals Pt and Al were extracted using core level and valence band spectra. The energy band alignments of Pt/TaOx and Al/TaO...
Semantic Web and ontology play an important role in various research fields today, but are rarely used in the materials science domain. In this paper we propose an approach to find a mapping method from metal materials database to an ontology. The proposed method refers to the latest W3C standard DM and R2RML. The goal of the mapping system is to transform Relational Database (RDB) to the Resource...
Partial discharge (PD) detection is the important research topic in the safe operation of electric equipment and power grid. Experimental investigation of partial discharge detection was carried out in a 12kV switchgear by Ultra-High-Frequency (UHF) method. Two kinds of typical artificial fault models, namely suspended-metal model and voids-in-dielectric model were used as discharge sources. The UHF...
Lightning protection of oil storage tanks has becomes a controversial subject, due to conflicting protection criteria. One such is the sense of using self-protection criteria, relying on the strict fulfillment of the operational conditions, material thickness and reliable bonding; the other refers to the necessity of standalone lightning protection system (LPS) where air terminals are installed in...
A circular hole in a metal plane is covered by oblate spheroidal lenses of equal dimensions that are anti-isorefractive to each other and located on opposite sides of the hole. The structure is surrounded by free space and illuminated by an electric dipole located on the axis of symmetry of the structure and axially oriented. The exact solution to the boundary-value problem is obtained as infinite...
Recent investigations demonstrated that porosification of LTCC enables a local modification of material properties, in particular of the effective permittivity. These studies revealed that the electric field strength is highest at the lower conductor track edges on the porosified substrate. The local field strength peaks cause substantial influence on the effectiveness of permittivity reduction due...
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