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1000 tulosta hakusanalla Michael Stephans

Kontakt- und Langzeitverhalten stromführender Verbindungen in der Elektroenergietechnik

Kontakt- und Langzeitverhalten stromführender Verbindungen in der Elektroenergietechnik

Stephan Schlegel; Michael Gatzsche; Christian Hildmann; Toni Israel

Springer Fachmedien Wiesbaden
2023
sidottu
In diesem Buch werden Erkenntnisse zu ruhenden Hochstromverbindungen aller Spannungsebenen zusammengefasst. Anwendung finden diese sowohl bei bestehenden Anlagen als auch für neue Konstruktionen in der Elektroenergietechnik, in der E-Mobilität und im Bereich der Batteriespeichertechnik.Stromführende, ruhende Verbindungen sind in unzähligen Anwendungen eingesetzt und für deren Funktion unverzichtbar. Oft versagen hochkomplexe Anlagen durch den Ausfall unzureichend ausgelegter oder hoch belasteter stromführender Verbindungen. Eine Großzahl der stromführenden Verbindungen wird montiert und muss über die geforderte Lebensdauer sicher funktionieren. Um dies unter den aktuellen Anforderungen zu gewährleisten, müssen die richtigen Leiter- und Beschichtungswerkstoffe gewählt, eine robuste Auslegung und Konstruktion vorhanden, die richtige Montage gewährleistet sowie eine gesicherte Grenztemperatur für die gewünschte Lebensdauer unter Berücksichtigung der Umgebungsbedingungen bekannt sein. Es werden die Theorie zur Kontaktphysik, die wichtigsten Leiter- und Beschichtungswerkstoffe, Einflussgrößen auf das elektrische Kontaktverhalten, der Zusammenhang zwischen mechanischem und elektrischem Kontaktverhalten, die Physik der Alterung und die Wirkung auf das Langzeitverhalten bei unterschiedlichen Einsatz- und Umgebungsbedingungen sowie Auslegungskriterien für die Konstruktion beschrieben. Weiterhin werden Ansätze zur numerischen Modellierung des elektrisch-mechanisch-thermischen Verhaltens dargestellt sowie Bewertungskriterien und Prüfverfahren zur Qualifizierung vorgestellt. Das Buch stellt ein fundiertes Nachschlagewerk dar, dass auf wissenschaftlichen Arbeiten und Erkenntnissen aus der Praxis der letzten 40 Jahre beruht.
Contact and Long-Term Behavior of Current-Carrying Connections in Electrical Power Engineering

Contact and Long-Term Behavior of Current-Carrying Connections in Electrical Power Engineering

Stephan Schlegel; Michael Gatzsche; Christian Hildmann; Toni Israel

Springer-Verlag Berlin and Heidelberg GmbH Co. KG
2024
sidottu
This book summarizes insights into stationary high-current connections across all voltage levels. These are applied in existing facilities and for new constructions in electrical power engineering, e-mobility, and battery storage technology. Current-carrying stationary connections are indispensable in countless applications. Complex systems often fail due to inadequate or heavily loaded connections. A large number of these connections are assembled and must function reliably over their required lifespan. To ensure this under current demands, correct conductor and coating materials must be chosen, robust design and construction ensured, proper installation guaranteed, and a secured temperature limit for the desired lifespan considering environmental conditions must be known. The book covers theories on contact physics, key conductor and coating materials, factors influencing electrical contact behavior, the relationship between mechanical and electrical contact behavior, aging physics, and long-term behavior under various operating and environmental conditions, along with design criteria for construction. Additionally, it presents approaches to numerically model electrical-mechanical-thermal behavior, introduces evaluation criteria, and outlines qualification testing methods. It serves as a comprehensive reference based on scientific research and practical insights from the past 40 years.
Nachhaltigkeitsmanagement in KMU

Nachhaltigkeitsmanagement in KMU

Stephan Damhorst; Michael Wilken

Springer-Verlag Berlin and Heidelberg GmbH Co. KG
2025
nidottu
Nachhaltigkeit ist längst mehr als ein Trend – sie ist ein entscheidender Erfolgsfaktor für zukunftsorientierte Unternehmensstrategien. Insbesondere kleine und mittlere Unternehmen (KMU) sehen sich zunehmend mit Anforderungen konfrontiert, ihre Nachhaltigkeitsleistungen transparent darzustellen. Ob in Liefer- und Dienstleistungsverträgen, öffentlichen Ausschreibungen oder bei Kreditvergaben – Nachhaltigkeitskriterien spielen eine immer größere Rolle. Dieser praxisorientierte Leitfaden richtet sich an Entscheider und Nachhaltigkeitsmanager in KMU. Er unterstützt sie dabei, ein strategisches und individuell angepasstes Nachhaltigkeitsmanagement aufzubauen. Schritt für Schritt wird gezeigt, wie Unternehmen ökologische, soziale und ökonomische Aspekte integrieren und eine fundierte sowie umsetzbare Nachhaltigkeitsberichterstattung etablieren können – effizient, pragmatisch und gewinnbringend.
Kryptographie und IT-Sicherheit

Kryptographie und IT-Sicherheit

Stephan Spitz; Michael Pramateftakis; Joachim Swoboda

Vieweg+Teubner Verlag
2011
nidottu
Kryptographische Verfahren sind unverzichtbar bei der Realisierung von elektronischen Geschäftsprozessen. Sie sichern die Abrechnung in Mobilfunknetzen und bilden eine Basis für Sicherheit im Internet und in Endgeräten sowie für die elektronische Vergabe von Lizenzen. In diesem Buch werden Sicherheitsdienste und Sicherheitsmechanismen begrifflich eingeführt und einfache kryptographische Mechanismen anhand historischer Verfahren veranschaulicht. Moderne kryptographische Algorithmen basieren auf diskreter Algebra; diese kann mit einfachen Beispielen intuitiv nachvollzogen werden. Mit elliptischen Kurven und Quanten-Kryptographie werden auch neuere Bereiche angesprochen. Neben den grundlegenden kryptographischen Mechanismen und Protokollen gibt das Buch Einblick in Anwendungen wie neuere Sicherheitsverfahren im Internet und in Mobilfunknetzen, Betriebssysteme von Chipkarten, Trusted Computing und Public-Key-Infrastrukturen.
Closing Death's Door

Closing Death's Door

Michael J. Saks; Stephan Landsman

Oxford University Press Inc
2021
sidottu
After heart disease and cancer, the third leading cause of death in the United States is iatrogenic injury (avoidable injury or infection caused by a healer). Research suggests that avoidable errors claim several hundred thousand lives every year. The principal economic counterforce to such errors, malpractice litigation, has never been a particularly effective deterrent for a host of reasons, with fewer than 3% of negligently injured patients (or their families) receiving any compensation from a doctor or hospital's insurer. Closing Death's Door brings the psychology of decision making together with the law to explore ways to improve patient safety and reduce iatrogenic injury, when neither the healthcare industry itself nor the legal system has made a substantial dent in the problem. Beginning with an unflinching introduction to the problem of patient safety, the authors go on to define iatrogenic injury and its scope, shedding light on the culture and structure of a healthcare industry that has failed to effectively address the problem-and indeed that has influenced legislation to weaken existing legal protections and impede the adoption of potentially promising reforms. Examining the weak points in existing systems with an eye to using law to more effectively bring about improvement, the authors conclude by offering a set of ideas intended to start a conversation that will lead to new legal policies that lower the risk of harm to patients. Closing Death's Door is brought to vivid life by the stories of individuals and groups that have played leading roles in the nation's struggle with iatrogenic injury, and is essential reading for medical and legal professionals, as well as lawmakers and laypeople with an interest in healthcare policy.
Multigenerational Communication in Organizations

Multigenerational Communication in Organizations

Michael G. Strawser; Stephanie A. Smith; Bridget Rubenking

Routledge
2021
sidottu
Multigenerational Communication in Organizations explores generational differences in the changing workplace from a communication perspective. Starting from the reality that a workplace can contain up to five different generations, these chapters examine topics like generational perceptions on the job search process; organizational culture; organizational identification; organizational crises; the dark side of workplace communication; remote working; and future challenges. Outlines of best practices and suggestions for application are provided based on the most recent data and corresponding literature. The authors also develop a data-forward understanding of Generation Z in context. This book is ideal for both scholars and practitioners in organizational communication and management, as well as for workplace managers and supervisors.
Branch-and-Bound Applications in Combinatorial Data Analysis

Branch-and-Bound Applications in Combinatorial Data Analysis

Michael J. Brusco; Stephanie Stahl

Springer-Verlag New York Inc.
2005
sidottu
This monograph focuses on the application of the solution strategy known as branch-and-bound to problems of combinatorial data analysis. Combinatorial data analysis problems typically require either the sel- tion of a subset of objects from a larger (master) set, the grouping of a collection of objects into mutually exclusive and exhaustive subsets, or the sequencing of objects. To obtain verifiably optimal solutions for this class of problems, we must evaluate (either explicitly or implicitly) all feasible solutions. Unfortunately, the number of feasible solutions for problems of combinatorial data analysis grows exponentially with pr- lem size. For this reason, the explicit enumeration and evaluation of all solutions is computationally infeasible for all but the smallest problems. The branch-and-bound solution method is one type of partial enume- tion solution strategy that enables some combinatorial data analysis pr- lems to be solved optimally without explicitly enumerating all feasible solutions. To understand the operation of a branch-and-bound algorithm, we d- tinguish complete solutions from partial solutions. A complete solution is one for which a feasible solution to the optimization problem has been produced (e. g. , all objects are assigned to a group, or all objects are - signed a sequence position). A partial solution is an incomplete solution (e. g. , some objects are not assigned to a group, or some objects are not assigned a sequence position).
Genetic Algorithms and Genetic Programming

Genetic Algorithms and Genetic Programming

Michael Affenzeller; Stefan Wagner; Stephan Winkler; Andreas Beham

CRC Press
2018
nidottu
Genetic Algorithms and Genetic Programming: Modern Concepts and Practical Applications discusses algorithmic developments in the context of genetic algorithms (GAs) and genetic programming (GP). It applies the algorithms to significant combinatorial optimization problems and describes structure identification using HeuristicLab as a platform for algorithm development.The book focuses on both theoretical and empirical aspects. The theoretical sections explore the important and characteristic properties of the basic GA as well as main characteristics of the selected algorithmic extensions developed by the authors. In the empirical parts of the text, the authors apply GAs to two combinatorial optimization problems: the traveling salesman and capacitated vehicle routing problems. To highlight the properties of the algorithmic measures in the field of GP, they analyze GP-based nonlinear structure identification applied to time series and classification problems. Written by core members of the HeuristicLab team, this book provides a better understanding of the basic workflow of GAs and GP, encouraging readers to establish new bionic, problem-independent theoretical concepts. By comparing the results of standard GA and GP implementation with several algorithmic extensions, it also shows how to substantially increase achievable solution quality.
Branch-and-Bound Applications in Combinatorial Data Analysis

Branch-and-Bound Applications in Combinatorial Data Analysis

Michael J. Brusco; Stephanie Stahl

Springer-Verlag New York Inc.
2010
nidottu
This monograph focuses on the application of the solution strategy known as branch-and-bound to problems of combinatorial data analysis. Combinatorial data analysis problems typically require either the sel- tion of a subset of objects from a larger (master) set, the grouping of a collection of objects into mutually exclusive and exhaustive subsets, or the sequencing of objects. To obtain verifiably optimal solutions for this class of problems, we must evaluate (either explicitly or implicitly) all feasible solutions. Unfortunately, the number of feasible solutions for problems of combinatorial data analysis grows exponentially with pr- lem size. For this reason, the explicit enumeration and evaluation of all solutions is computationally infeasible for all but the smallest problems. The branch-and-bound solution method is one type of partial enume- tion solution strategy that enables some combinatorial data analysis pr- lems to be solved optimally without explicitly enumerating all feasible solutions. To understand the operation of a branch-and-bound algorithm, we d- tinguish complete solutions from partial solutions. A complete solution is one for which a feasible solution to the optimization problem has been produced (e. g. , all objects are assigned to a group, or all objects are - signed a sequence position). A partial solution is an incomplete solution (e. g. , some objects are not assigned to a group, or some objects are not assigned a sequence position).
Genetic Algorithms and Genetic Programming

Genetic Algorithms and Genetic Programming

Michael Affenzeller; Stefan Wagner; Stephan Winkler; Andreas Beham

Chapman Hall/CRC
2009
sidottu
Genetic Algorithms and Genetic Programming: Modern Concepts and Practical Applications discusses algorithmic developments in the context of genetic algorithms (GAs) and genetic programming (GP). It applies the algorithms to significant combinatorial optimization problems and describes structure identification using HeuristicLab as a platform for algorithm development.The book focuses on both theoretical and empirical aspects. The theoretical sections explore the important and characteristic properties of the basic GA as well as main characteristics of the selected algorithmic extensions developed by the authors. In the empirical parts of the text, the authors apply GAs to two combinatorial optimization problems: the traveling salesman and capacitated vehicle routing problems. To highlight the properties of the algorithmic measures in the field of GP, they analyze GP-based nonlinear structure identification applied to time series and classification problems. Written by core members of the HeuristicLab team, this book provides a better understanding of the basic workflow of GAs and GP, encouraging readers to establish new bionic, problem-independent theoretical concepts. By comparing the results of standard GA and GP implementation with several algorithmic extensions, it also shows how to substantially increase achievable solution quality.
Evaluation of the Return-To-Work Fund in California's Workers' Compensation System

Evaluation of the Return-To-Work Fund in California's Workers' Compensation System

Michael Dworsky; Denise Quigley; Stephanie Rennane; Madeline Doyle

RAND
2022
nidottu
California's Return-to-Work Supplement Program (RTWSP) is a new benefit for permanently disabled workers who suffer disproportionately high earnings loss in comparison with their workers' compensation benefits. The RTWSP provides a one-time $5,000 payment to workers who cannot return to work following a permanently disabling workplace injury. RAND researchers evaluated the program's performance and identified options for improving the RTWSP.