Search results for "Semi"

Semiconducting half-Heusler and LiGaGe structure type compounds

2009

Compounds with LiAlSi (half-Heusler) and LiGaGe structure types have been investigated by means of band structure calculations. The LiAlSi structure type is known as the half-Heusler structure type, whereas LiGaGe is a closely related hexagonal variant. A remarkable feature of some XYZ half-Heusler compounds with 8 and 18 valence electrons is, that despite being composed of only metallic elements, they are semiconductors. More than 100 semiconducting compounds within these structure types are known. LiGaGe compounds have an additional degree of freedom, namely the degree of puckering of the layers. These compounds can become semiconducting at a certain degree of puckering. Half-metallic beh…

Photoemission of electrons into electrolyte from cadmium oxide layers formed by anodic oxidation of undeformed and plastically deformed cadmium plates

1995

Studies of electron emission (external photoeffect) at the electrode/solution interface are an important part of contemporary photoelectrochemistry. The results of systematic studies of this phenomenon led to the formulation of fundamental relationships and to new methods for investigation of the physicochemical processes occurring at the electrode-electrolyte interface [1-4]. In particular, photoemission measurements enabled a number of parameters relating to the structure of the semiconductor/electrolyte interface to be determined. The photoemission current from semiconductors with many surface states to solutions with a sufficiently high electrolyte concentration is described by the well…

Oligothiophenes for Pattern Formation by Stamping

2003

Oligothiophene monomers with a fixed length varying from 3 to 5 thiophene rings were prepared by Stille coupling. They were functionalised with one or two methacrylate groups to allow polymerization and cross-linking. These monomers can be patterned with the help of soft silicon stamps (e.g., with the micro-injection moulding in capillaries process) on substrates like glass or flexible polymer foils. If a photoinitiator has been added, they can then be hardened by exposure to UV-light through the transparent stamp. Afterwards the stamp can be removed. This allows the preparation of several centimeters long oligothiophene lines of a width varying between 50 and 0.5 μm. These lines of semicon…

An optimality test for semi-infinite linear programming

1992

In this paper we present a test to characterize the optimal solutions for the continuous semi-infinite linear programming problem. This optimality characterization is a condition of Kuhn–Tucker type. The resolution of a linear program permits to check the optimality of a feasible point,to detect the unboundedness of the problem and to find descent directions. We give some illustrative examples. We show that the local Mangasarian–Fromovitz constraint qualification is almost equivalent to Slater qualification for this problem. Furthermore, it follows from our study that this optimality condition is always necessary for a wide class of semi-infinite linear programming problems

THE EXPRESSION OF EVIDENTIALITY IN SPOKEN AND WRITTEN TEXTS: EMPIRICAL APPROACHES TO ROMANCE LANGUAGES

2020

Evidentiality is a grammatical category that encodes information source as its primary meaning. The information can be: acquired through direct perception, reported by others (hearsay) or inferred by the speaker upon considering the information that is available. Languages with an evidential grammatical category have morphemes with a primary evidential value (Aikhenvald 2004). Nevertheless, Romance languages, like many other languages, have a tense- modal system and lack an evidential grammatical category, instead of which several lexical units or certain constructions convey information source. This special issue is devoted to some of those items, such as modal adverbs, evidential meanings…

Metal/Semiconductor Barrier Properties of Non-Recessed Ti/Al/Ti and Ta/Al/Ta Ohmic Contacts on AlGaN/GaN Heterostructures

2019

This paper compares the metal/semiconductor barrier height properties of non-recessed Ti/Al/Ti and Ta/Al/Ta contacts on AlGaN/GaN heterostructures. Both contacts exhibited a rectifying behavior after deposition and after annealing at temperatures up to 550 &deg

Parallel Publishing from Converis to DSpace Using Custom Export and REST API

2018

Presentation in the CRIS 2018 conference in Umeå, Sweden, June 14 - 16, 2018

Weak convergence theorems for asymptotically nonexpansive mappings and semigroups

2001

The Interplay Between Gesture and Discourse as Mediating Devices in Collaborative Mathematical Reasoning:A Multimodal Approach

2008

This article aims to identify the mathematical reasoning strategies expressed through gestures and speech used by two groups of sixth-grade pupils when solving a task related to the transition between two semiotic representations: figure and Cartesian diagram. The article also identifies the difficulties the pupils meet in the solution process. The analyses of the group dialogues focus particularly on the gesture dimension of deixis. The pupils in both groups have used the following deictic gestures: pointing, held-point, linear point-slide, and circular point-slide in their solution process, while repeated pointing has been identified only in one of the groups. These pointing gestures are …

Le discours coranique : énonciation et énonciateurs

2018

The Qur'an, an omnipresent discourse via different media, has been a constant source of attention since the beginning of writing in the Arab sphere; writing as a composition of works because culture was, before the Koran, oral. From then until today, he remains an inexhaustible object of study and speculation. The language sciences are not sufficiently exploited to explore its mysteries as a unique religious discourse. Linguistic studies were limited to the linguistic domains of Arabic such as syntax and rhetoric which attempted to resurrect what makes the Koran an inimitable discourse as it presents itself and as presented by Islamic Tradition. This work aims at an analysis that draws mode…