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Functional failures may be related to chemical and/or physical changes in the bulk of a component or at the interface between components. Failure due to contamination also may occur. A vital part of failure analysis is to use analytical techniques to elucidate the reason for failure. Infrared spectroscopy (FTIR) — a technique commonly used for identification of organic/polymeric materials — can be...
Surface mount technology is commonly used technology in electronics assembly. It is a method where the components are mounted directly onto the surface of printed circuit board. This article deals with risk analysis of surface mount technology in electronics assembly. Risk analysis applies many methods of analysis with the focus on potential hazards. Its aim is to improve understanding of process...
Intrinsic stress and electromechanical coupling coefficient are the most important parameters of piezoelectric thin films used in membrane as well as cantilever type MEMS such as energy harvesters, transducers and others. In this paper, practical aspects controlling stress and crystallinity in aluminum nitride (AlN) film used in manufacturing of Bulk Acoustic Wave (BAW)/ Film Bulk Acoustic Resonator...
The exclusion of dust, contamination and ice from sensors and structural surfaces is of paramount importance to ensure the efficient operation of air and space systems as well as the health and safety of the crew operating these systems. For example, dust contamination gathers on photonic sensors inhibiting motion and data gathering. In addition, devices that require transparency to light for maximum...
Electromigration-based deposition (EMBD) is an additive nanolithography technology for the fabrication of three-dimensional (3D) nanostructures. Key techniques for extending the capability of EMBD have been tackled experimentally including the deposition against a non-conductive surface, shape control of the as-deposited nanostructure, and continuous mass feeding. The process is based on nanofluidic...
A fundamental problem with many solid freeform fabrication systems is the production of large dimensional errors, due to the freeform construction process. The subject of this paper is surface mapping feedback (SMF), a closed-loop technique for minimizing the dimensional errors produced by rapid prototyping systems. The main steps of the technique are presented, namely part measurement, control implementation,...
The EC directive 2002/95/ES (RoHS) limited (with few exceptions) the use of lead in electronic production, especially in solders and surface finishes. This brought significant changes in their reliability. The electroplated tin coating is currently among the most widely used surface finishes in the electronic industry, appearing everywhere from the coating of solder pads on SMD devices to corrosion...
This poster discusses a new free-form modeling material called Quimo (Quick Mock-up), designed for use in spatial augmented reality environments. Quimo is a white malleable material that can be sculpted and deformed with bare hands into an approximate model. The material is white in color, retains its shape once sculpted, and allows for later modification. Projecting imagery onto the surface of the...
In the domain of material science, quantitative fractography is an analytical tool to study the characteristics of a fracture surface. The inception of Scanning Electron Microscope (SEM) has motivated the researchers toward the quantitative analysis of such surface. Due to fracture, new surfaces are evolved and voids are also formed. Extraction of such regions (surface/void) from SEM fractographs...
In the process of impinging dryness, surface convective heat transfer coefficient is one of the most important parameters of effecting dryness effectiveness. It is usually confirmed by testing, this paper, for film drying craftwork under impingement jet, gives the computational method of surface convective heat transfer coefficient, and analyses the effect of the three factors, which are the difference...
A The developing of green remanufacturing for vehicle engine was introduced briefly. Based on the analyzing of key part's failure mode and remanufacturing of armored vehicle engine this paper introduced the remanufacturing technology program for a tank diesel engine and introduced a preliminary evaluation criterion which is an exploratory development for the construction of index system on there manufacturing...
Polyurethanes (PUs) are synthetic polymers with easily adaptable mechanical properties to many medical applications, including those in which contact with blood is required. Not all PUs are haemocompatible even if they are not cytotoxic. In this study PUs obtained from poly(ethylene adipate)diol (PEGA), polytetrahydrofuran (PTHF) or poly(propylene)glycol (PPG) as soft segments and 4',4'-diphenylmethanediisocyanate...
AC contactor is an important component in the control system, and its reliable work is very important too. Electrical contact is a contactor's connecting parts, and it undertakes making and breaking the current. So, it's performance influence the reliable operation of the contactors directly. CJ20-40 AC contactor emerged sticking phenomenon in the course of practice using. So, the electrical contact...
Infrared Thermography is an emerging technology for nondestructive testing. However, it is subject to blurring and degradation of the acquired signal, as the diffusive nature in the process. This make difficulties for qualitative and quantitative analysis, especially when deeper defects located within the substrate, as well as high thermal conductivity materials are inspected. In this article, we...
Sediment remobilization processes have a high impact on coastal morphology as well as offshore engineering. In many cases countermeasures are required to preserve the stability of the construction or coastline. To apply such countermeasures in the most effective manner, it is crucial to (i) locate and map areas of sediment erosion and deposition and to (ii) quantify the mobilized sediment with a high...
Multiscale or multi-physics modeling play a major role in many important problems today. In the past few years, there have been increasingly growing research activities aiming at developing novel multiscale computational methods. In this work, we focus on one challenge multiscale heterogeneous problem, modeling electromagnetic wave scattering from a composite unmanned aerial vehicle (UAV). Two new...
This work presents the direct laser printing of thylakoid membranes for the fabrication of photosynthetic-based amperometric biosensors. Laser printing is an excellent tool for direct immobilization of the transferred photosynthetic material onto non-functionalized electrodes due to the high impact pressure of the transferred droplets. The use of this laser transfer technique enabled complete wetting...
The purpose of the study is to monitor the behaviour of titanium alloy (Ti6Al4V) with and without hydroxyapatite superficial coating in Fusayama-Meyer artificial saliva by electro-corrosion tests, spectrometry and scanning electron microscopy. Materials and methods: we investigated the behaviour of titanium alloys Ti6Al4V and Ti6Al4V alloy coated with HA layers in Fusayama-Meyer artificial saliva...
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