Konzeption und Entwurf einer Komponente für Organisationsmodelle

Im Umfeld von Workflow-Management-Systemen (WfMS) kommt der Organisationsver-waltung die Aufgabe zu, für anfallende Arbeitsschritte nach einem festgelegten Verfahren die Menge der potentiellen Bearbeiter zu bestimmen. Die dazu benötigten Daten bezieht die Organisationsverwaltung aus dem Organisationsmodell, das diese Informationen beherbergt. Ein Organisationsmodell bietet die Möglichkeit, die Aufbaustruktur einer Organisation hinrei-chend genau zu formalisieren, um eine Qualifikation für eine Aufgabe nach beliebigen Kriterien definieren zu können. Da die Aufbaustruktur einer Organisation kein unabänderliches Gebilde darstellt, sondern sich ständig im Wandel befindet, muß eine Organisationsverwaltung auch Operationen zur Verfü-gung stellen, mit denen die Organisationsstruktur unter Einhaltung von Korrektheitsbe-dingungen manipuliert werden kann. Diese Arbeit betrachtet die Möglichkeiten, die verfügbare Systeme für die Organisationsver-waltung bieten und zeigt deren Grenzen auf. Im Anschluß an diese Betrachtung werden neue, ausdrucksmächtigere Konzepte vorgestellt und bis zu einem konkreten Entwurf entwickelt. Besondere berücksichtigt werden dabei Aspekte wie: •Flexibilität und Anpaßbarkeit an reale Organisationen •Hohe Ausdrucksmächtigkeit bei der Bestimmung von Aufgabenträgern •Zusammenwirken autonomer Teilsysteme in einem Workflow-Management-System •Evaluierung von möglichen Datenhaltungssystemen für die Organisationsverwaltung (LDAP) Ziel dieser Arbeit ist der Entwurf einer Organisations-modell-Komponente für den zweiten Prototypen des ADEPT – Workflow-Management-Systems der Universität Ulm

Synthesis and Characterization of Core-Shell Zinc Silica Nanoparticles and Zinc Silica Nanogels for Agricultural Applications.

Plant pathogens are a serious problem facing the agricultural industry today. Current methodologies use copper based biocides as the main form of defense. Unfortunately this can lead to damaging environmental effects and increased rates of antimicrobial resistance. In this study, antimicrobial activity of multiple alternative zinc-based nanoformulations were tested against three important plant pathogens: Xanthomonas alfalfae, Pseudomonas syringae, and Clavobacter michiganensis. Xanthomonas sub species cause Citrus canker, a devastating disease that affects millions of citrus trees worldwide while the latter two affect tomato crops. Materials synthesis was completed and the resulting nanoformulations were characterized by Atomic Absorption Spectroscopy, Scanning Electron Microscopy, High Resolution Transmission Electron Microscopy, and X-Ray Photoelectron Spectroscopy. The antimicrobial efficacy of the newly synthesized formulas and two commercially available products, Kocide 3000 (DuPont) and Nordox (Brandt), were determined by Minimum Inhibitory Concentration Assays followed by Bacterial Viability Assays. The subsequent data demonstrated a marketed difference in the way the antimicrobial agents acted upon the bacterial species. The core-shell zinc silica nanoparticles (C-SZnSiNP) proved to be ineffective, while the zinc silica nanogel (ZnSiNG) was as successful at killing the bacteria as the commercial products. This shows promise for a new alternative material with zinc at the forefront of the fight against plant pathogens

NOISE AND VOCAL DOSES ACQUIRED BY AN ELEMENTARY SCHOOL MUSIC TEACHER ACROSS NINE DAYS: A DESCRIPTIVE CASE STUDY

The purpose of this descriptive case study was to assess the status of vocal (KayPentax APM) and noise (Etymotic ER200D dosimeter) dosages acquired by an elementary school music teacher (N=1) during waking hours across (a) a full teaching week (5 days) and (b) 2 weekends (4 days), one prior to and one and after the teaching week. Various studies to date have examined vocal dosages acquired by music teachers. Other studies have analyzed noise dosages acquired by music teachers. No study, however, has yet examined vocal and noise dosages acquired simultaneously by the same music teacher. Primary findings indicated: (a) mean vocal distance doses and noise doses acquired during teaching hours exceeded doses acquired during non-teaching hours; (b) the most elevated Dd and noise dosage levels occurred during choir rehearsals and sixth grade general music classes; (c) the participant exceeded recommended NIOSH noise doses on 4 of the 5 teaching days. (d) comparison of noise dose percentage and vocal dose percentage during teaching hours indicated, overall, that voice dose percentage appeared to align directionally with noise dose percentage; (e) however, there were some class periods where vocal dose percentage exceeded noise dose percentage. These results were discussed in terms of proactive voice and hearing care for elementary school music teachers, possible relationships between acquired vocal and noise doses, limitations of the study, and suggestions for future research

Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator

In this contribution, efficiency enhancement of a radio frequency (RF) power amplifier (PA) for Long Term Evolution (LTE) base stations using envelope tracking is investigated. The dynamically adapted drain bias voltage is provided by a three-level class-G modulator. The potential of this bias modulator is demonstrated with a class AB PA built in gallium nitride (GaN) technology with an operation frequency of 2.75 GHz, a maximum output power of 41 dBm and a peak power-added efficiency (PAE) of 60%. When driven by an LTE signal with a bandwidth of 20 MHz, overall system efficiency can be increased from 17% with a constant supply voltage up to 29% with envelope tracking. This is accompanied by a reduction of linearity. Adjacent channel leakage ratio (ACLR) decreases by 10 dB in the first and by 18 dB in the second adjacent channel, respectively. Error vector magnitude (EVM) increases from 9% up to 29%

High-frequency equivalent circuit of GaAs FET's for large-signal applications

The application of GaAs field effect transistors in digital circuits requires a valid description by an equivalent circuit at all possible gate and drain bias voltages for all frequencies from DC up to the gigahertz range. An equivalent circuit is presented which takes into account the gate current of positively biased transistors as well as the symmetrical nature of the devices at low drain voltages. A fast method of determining the elements of the equivalent circuit at all bias points without frequency limitations is presented. Direct computation from analytical expressions, without iteration, allows this parameter extraction procedure to be used for real-time on-wafer parameter extraction. Large-signal calculations are possible by inserting the voltage dependences evaluation for the elements into suitable simulation programs, such as SPICE

Novel push-pull chromophores to prepare electro-optic modulators

In recent years, a large number of push-pull organic molecules have been proposed as promising candidates for electronic and optical applications. Generally, the main effort has been focused on the design of chromophores with large first hyperpolarizability values (β); this would result in a wide variety of nonlinear optical (NLO) applications, such as modulators.[1,2] In this work, we report an experimental and theoretical investigation of the NLO properties of novel push-pull systems derived from the dicyanomethylene-4H-chromene (DCM) group. Particular attention will be paid to better understand the molecular and electronic properties of these systems by using vibrational spectroscopic techniques and electrochemistry. Furthermore, these materials have been tested in a silicon-organic hybrid modulator based on an integrated dual-mode interferometer.[3]Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Frequency dependent CV measurements of GaAs/AlGaAs heterostructures

A procedure is described to determine the carrier density profile in the channel of a FET by evaluating S-parameters measured over a broad frequency range. Applying this method to GaAs/AlGaAs heterostructures, a frequency dispersion of the gate capacitance has been found, which is attributed to a parasitic conducting channel

Design and Development of an Electrolarynx With Variable Frequency and Integrated Bluetooth Air Interface

Eine Elektrolarynx ist eine Sprechhilfe für laryngektomierte und tracheotomierte Patienten, die beispielsweise durch Kehlkopfkrebs ihre Stimmbänder ganz oder teilweise verloren haben. Herkömmliche Geräte arbeiten mit einer monotonen fest eingestellten Frequenz, die nur von einem Arzt neu eingestellt werden kann. Die Stimme klingt daher sehr „roboterhaft“, da es dem Patient nicht möglich ist, mit seiner Stimmfrequenz dem Satzbau zu folgen. Im Rahmen einer Diplomarbeit wurden neue Konzepte und Methoden entwickelt die Sprachqualität, insbesondere die Intonation zu verbessern. Mit dem Einsatz eines resistiven Folien-Drucksensors (FSR) in Verbindung mit einer Mikrocontrollerschaltung und einer Bluetooth-Kommunikationseinheit wurde ein Prototyp aufgebaut, der im Bereich der elektronischen Sprechhilfen einen großen Vorschritt darstellt. Neben den neuen Möglichkeiten der Sprachgestaltung ist das Gerät um ein vielfaches komfortabler auf den jeweiligen Patienten einstellbar und kann darüber hinaus auch vom Patienten selbst konfiguriert werden