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2.5D IC is an important transition product of 3D IC in the next generation. It has very important commercial value. However, at present 2.5D IC package process has numerous issues that need to be overcome, especially for interface delamination caused by warpage under reflow temperature. Conventionally, the material adopted for the passivation (PA) layer in 2.5D IC package is inorganic metal glass...
In the last years, the research in the gas sensor field had a significant upward thrust. Regarding the chemoresistive gas sensors, this has produced a remarkable study of metal oxides semiconductors which, however, have shown different limits. In particular their low selectivity and lack of stability take them to an unreliable responses over time. For this reason, in this work it was decided to study...
In a future society with limited access to fossil fuels, technologies for efficient on demand delivery of renewable energy are highly desirable. In this regard, methods that allow for solar energy storage and on demand solar driven energy generation are particularly relevant since the sun is the most abundant energy source.
The EU-funded eNanoMapper project proposes a computational infrastructure for toxicological data management of engineered nanomaterials (ENMs) based on open standards, ontologies and an interoperable design to enable a more effective, integrated approach to European research in nanotechnology. eNanoMapper's goal is to support the collaborative safety assessment for ENMs by creating a modular, extensible...
A swing-arm conditioning is generally adopted for chemical mechanical polishing (CMP) system to recover the surface roughness of polishing pad. However, the conditioning process results in uneven pad profile. During conditioning, locally excessive pad wear relates to the pad lifetime in CMP process. In this paper we investigate on the relationship of locally controlled swing condition and maximum...
Classical theory “Lotka's Law” has been proven in many fields that the number of persons who contribute n outputs is about 1/nα of those who contribute one output, where the exponent α is a parameter about 2 to 3 in the most cases reported previously. Our analysis on patent productivity of inventors in Japan shows different characteristics from the results of previous studies on US and European firms...
The ability to communicate technical information is a critical engineering skill underemphasized in many programs. A base for successful technical communication is often established through a required course early in engineering curriculum. However, these courses are frequently taught by English/communication instructors, and the content is neither integrated into subsequent curriculum nor applied...
The Drum Tower, Office of the President and Zhan Yuan Garden were selected as examples to investigate the present existence status and corresponding effectiveness of protection measures (especially chemical aspects). A new strategy of using sol-gel technique hybrided with chitosan was pertinently brought forward. The application prospect is analyzed. Results show that most of the construction and...
In this paper the effects of chemical and electrical driving forces on the evolution of interfacial reaction layers in lead-free solder interconnections are discussed. Firstly, the effects of alloying and impurity elements on the driving forces for diffusion in the Cu-Sn system are analyzed. These results are then used to predict the subsequent changes in the intrinsic fluxes of the elements. It is...
This paper presents an overview of this field of research, outlines some of the opportunities available to add value to fishery by-product streams alongside some of our most recent studies and data in this area. In Atlantic Canada around 418 000 tonnes per year waste is produced at fish processing plants. This waste could be used to give a range of products as it is made up of diverse substances including...
In this paper we study the thermoelectric (TE) properties of graphene nano-ribbons (GNRs) with incorporated nanopores (NPs), and present a nanopore-engineering approach for enhancing their TE properties. The nearest neighbor tight binding (TB) model and Non equilibrium Green's function (NEGF) method were employed to obtain the electron transmission spectra. For phonon calculations, Tersoff potential...
Automatic grading of oil palm fresh fruit bunch is desired. In this study, a capacitive sensing system was designed and developed for the purpose of grading oil palm fresh fruit bunch. In this method, oil palm fresh fruit bunch placed between capacitive plates as a dielectric material and then measure the resulting capacitance voltage. Experiments were carried out using oil palm bunches of Tenera...
THz optical constants were measured for layered clay minerals with different chemical compositions (kaolinite, hectorite and montmorillonite). Corresponding hybrid materials were prepared after chemical modification of parent clays with intercalation (using e.g. alkylamines or amino acids). The THz-TDS spectra showed clearly successful chemical modification of used clay minerals. This can be useful...
Alumina nanoparticles have been increasingly used in the areas of medicine, biochemistry and industry. A number of chemical methods have been used for the preparation of alumina nanoparticles, including the introduction of surfactants to improve the suspensivity of the nano-sized particles. In this study, alumina (Al2O3) nanoparticles have been fabricated by using Electrical Discharge Machining (EDM)...
For 2.5D and 3D IC packaging, wafer back side processing often has temperature limits substantially lower than curing temperature of conventional polyimide (PI). New low temperature curable insulation materials possess very different properties and require thorough evaluation to ensure process compatibility and product reliability. In this work, we present a set of evaluation methods that can be used...
The main purpose of this work was to understand property modifications during lignocellulosic biomass pyrolysis by using different experimental techniques (thermal analysis methods, x-ray diffraction and diffuse reflectance infrared Fourier transform (DRIFT)). Miscanthus x Giganteus as energy crop and its components (cellulose, holocellulose and lignin) were used as feedstock in this investigation...
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...
This study focuses on the seals, especially European wax seals. We use THz spectroscopy imaging for non-destructive evaluation of natural materials. Using a time domain THz spectroscopy and imaging system, THz reflection images are generated in the 0.1–3 THz range and demonstrate that we can inspect the internal structure under a thick layer of old wax. X-Ray images will be used as a reference and...
Detection and investigation of the problems of continuity of the multidisciplinary chemical training of students at the technological University are due to the need to overcome the total contradiction between the General nature of the basic school training and the special tasks of chemical education at the University of technology, which is exacerbated in the conditions of functioning of the University...
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