Materials Literature
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In this paper the influence of pressure and temperature on four compounds with defect pyrochlore structure (NH4NbWO6, RbNbWO6, CsNbWO6, and p-WO3) is explored by means of X-ray diffraction, vibrational (Raman and infrared absorption) spectroscopy and computer simulations. Several structural transitions were observed,…
rappresentano ad oggi la famiglia di materiali a piu elevata resistenza specifica nel campo di temperature fino a 800°C. La maggiore riserva per una introduzione incisiva nelle applicazioni industriali e ancora il costo di questi materiali. Costo che e rappresentato dalla somma dei costi dei materiali costituenti e de…
Pectin is a natural, anionic, biodegradable and biocompatible polysaccharide extracted from citrus peels that has gelation capability due to its electrostatic interactions with cationic ions.The aim of this study was to investigate the effects of crosslinking agents (i.e., calcium chloride or quaternized guar gum) on…
This chapter discusses some basic concepts of electrochemistry which are necessary in order to understand the behavior of the electrochemical components. It briefly overviews the formalization and expression of Butler-Volmer equation and Tafel equation. In an electrochemical component, redox reactions occur at the int…
Supercapacitors, or electric double layer capacitors (EDLCs), are devices for buffer storage of electrical energy. This chapter studies the structure of the supercapacitor cell, which consists of two activated carbon electrodes and a separator rolled together and impregnated with an organic electrolyte. The sizing of…
We have investigated the superconducting(SC)-gap anisotropy of Ba$_{0.07}$K$_{0.93}$Fe$_2$As$_2$, Ba$_{0.12}$K$_{0.88}$Fe$_2$As$_2$, and Ba$_{0.24}$K$_{0.76}$Fe$_2$As$_2$ using laser-based angle-resolved photoemission spectroscopy. Whereas in the end material K122, the inner and middle Fermi surfaces (FSs) have substa…
Розглянута система комплексних параметрів, вживана при технологічному забезпеченні експлуатаційних властивостей загартованих крупномодульних зубчастих коліс, методика двоступінчатого забезпечення даних властивостей, із застосуванням графічних методів системної оптимізації. Наукова новизна досліджень авторів полягає в…
A silica vitrea e um material fundamental para a industria de alta tecnologia devido as suas propriedades unicas. Dentre estas podemos destacar a sua alta pureza aliada ao elevado ponto de fusao e alta transmitância no ultravioleta. E um material muito usado na industria de semicondutores e em fotonica. Para aplicacoe…
This chapter discusses the main technologies used for electrochemical accumulators such as lead, nickel and lithium accumulators. An electrochemical accumulator is often characterized by a number of values or indicators. These values depend on the technology of the battery, but also on the environment and the usage co…
A descoberta do grafeno e dos metodos de obte-lo de maneira isolada, impulsionaram o desenvolvimento de uma nova classe de dispositivos nanoeletronicos com base em suas propriedades fisicas e eletricas. Tao logo, foi observado que suas propriedades eletronicas sao fortemente sensiveis ao ambiente, e tambem por molecul…
Das Ferromagnet-Halbleiter-System Fe3Si/GaAs, das ein möglicher Kandidat für die Realisierung der Spininjektion in\nmagnetoelektronische Bauelemente ist, wird bezüglich seiner strukturellen und magnetischen Eigenschaften und deren\nKorrelation untersucht. Vorangehend wird die Schichtmorphologie durch eine geeignete Wa…
In der vorliegenden Studie wurde in einem Zeitraum von einem Jahr in Berlin ein Messprogramm mit vier Membranbioreaktoren (MBR) durchgeführt mit dem Ziel eine repräsentative Datenbank vergleichbarer Messungen an verschiedenen Membranbioreaktoren zu erstellen. In diesen Systemen wurden siebzehn Parameter wöchentlich ge…
Μικρές συγκeντρώσeις γραφeνίου μπορούν να τροποποιήσουν σημαντικά τη φασική συμπeριφορά και τα μηχανικά και ηλeκτρικά χαρακτηριστικά των πολυμeρικών υλικών. Στη παρούσα eργασία παρουσιάζουμe αποτeλέσματα από μία ιeραρχική μeθοδολογία προσομοίωσης που οδηγeί στη πρόβλeψη των θeρμοδυναμικών, δομικών, δυναμικών και μηχαν…
The motion of a contact line is examined, and comparisons drawn, for a variety of proposed models in the literature. We provide an overview and extension of the original work on the moving contact line problem to elucidate and motivate some of the proposed methods to alleviate the multivalued velocity and nonintegrabl…
Abstract. We present a formalism to describe slowly decaying systems in the context of finite Markov chains obeying detailed balance. We show that phase space can be partitioned into approximately decoupled regions, in which one may introduce restricted Markov chains which are close to the original process but do not…
We discuss the occurrence of crossing points in the magnetization- temperature (m,T) plane within the framework of critical phenomena. It is shown that in a two-dimensional superconducting slab of thickness ds mz (δ) versus temperature T curves measured in different fields H = H (0,sin (δ),cos (δ)) will cross at the c…
Amino-functionalized graphene sheets were prepared through chemical reduction by hydrazine hy-drate, amination or amidation of graphite oxide. For amination of graphite oxide were used polyamine such as ethylenediamine, diethylenetriamine and triethylenetetramine. Addition of amine groups to graphene is identified by…
Spin-Polarized Transport in Quantum Dots System with Rashba Spin-Orbit Interaction X-T An and J-J Liu Optical Properties of Spins in Coupled Semiconductor Quantum Dots E Stinaff Triangular Triple Quantum Dots Driven by AC Magnetic Fields G Platero Spin Polarized Transmission through Single and Double Aharanov-Bohm Rin…
Selected theoretical developments in modeling of deposition of submicrometer size (submicron) particles on solid surfaces, with and without surface diffusion, of interest in colloid, polymer, and certain biological systems, are surveyed. We review deposition processes involving extended objects, with jamming and its i…
Technicians working at the Pantex Plant routinely perform assembly/disassembly operations on weapons containing plastic-bonded explosives (PBXs). With high explosives (HE) operations comes the potential for high consequence accidents. As a result, a process for hazard analysis has been developed within the DOE-NNSA co…