Optimal Inductor Design and Material Selection for High Power Density Inverters Used in Aircraft Applications

This paper presents the design and optimization of power inductors for three-phase high-power-density inverters to be used in aircraft applications. The inductor’s geometric parameters, magnetic properties, core material selection, core and copper losses in addition to temperature calculations are taken into account to meet the low losses and high frequency specifications of the considered high power density inverter. A multi-objective optimization algorithm was developed to calculate weight, volume, and losses of the inductor for different current ripples, different switching frequencies and different inductor core materials. The results of a weight-objective optimization are presented showing the optimal efficiency and power density of the inverter for five chosen core materials, namely the silicon steel, ferrite, iron powder, amorphous and nanocrystalline

Enterprise Behavior and Privatization of the Large Enterprises in the Russian Federation

The Economic Transition and Integration (ETI) Project at IIASA has built on the institute's tradition of promoting collaborative research between East and West. The ETI Project's proven ability in dealing with issues pertaining to the transformation from central planning to market economics has been valuable for policy-makers and scientists alike. As a result, the government of the Russian Federation turned in 1992 to the ETI Project to organize a series of seminars and provide reports on topics of concern to the government. The Ford Foundation and the Pew Charitable Trusts have generously provided financial support for the seminar series. This report summarizes the contributions of participants at two related seminars held at the request of the Russian government at IIASA in the summer of 1993: Enterprise Behavior under Conditions of Economic Reform and Privatization of Large State Enterprises, both in the Russian Federation. Enterprise behavior, particularly of the large state enterprises that continue to dominate the Russian industrial and service sectors, is a crucial factor determining the success of economic reform. Somewhat surprisingly, the changing economic conditions have as yet to be accompanied by similarly sweeping alterations in firm behavior. The first of the two summer seminars focussed on why and how managerial attitudes and objectives, enterprise relationships, financial issues and taxation, foreign trade, and social welfare were significant in explaining present trends in enterprise behavior. Seminar participants searched out alternatives that would make these factors more conducive to promoting economic recovery and growth, and also compared the behavior of Russian enterprises with experiences in Poland and the Czech Republic. Privatization of large state enterprises is an integral part of the Russian economic transition. Vice Premier Anatoly Chubais opened the second workshop by reviewing the economic and political history of Russian privatization efforts, summarizing recent developments, and outlining future plans. Potential and actual privatization influence managers' and firms' behavior before and after the process is undertaken. Further discussions were devoted to the legal and institutional environment, the restructuring and privatization interface, and a review of privatization techniques and experiences from Central and Eastern Europe. Once again, the seminar revealed an intense willingness of experts from Russia, Central and Eastern Europe, and the West to share their valuable experiences in an effort to find approaches to more optimally encourage the successful transition to a market economy

Integration of blockchains with management information systems

In the era of the fourth industrial revolution (Industry 4.0), many Management Information Systems (MIS) integrate real-time data collection and use technologies such as big data, machine learning, and cloud computing, to foster a wide range of creative innovations, business improvements, and new business models and processes. However, the integration of blockchain with MIS offers the blockchain trilemma of security, decentralisation and scalability. MIS are usually Web 2.0 clientserver applications that include the front end web systems and back end databases; while blockchain systems are Web 3.0 decentralised applications. MIS are usually private systems that a single party controls and manages; while blockchain systems are usually public, and any party can join and participate. This paper clarifies the key concepts and illustrates with figures, the implementation of public, private and consortium blockchains on the Ethereum platform. Ultimately, the paper presents a framework for building a private blockchain system on the public Ethereum blockchain. Then,integrating the Web 2.0 client-server applications that are commonly used in MIS with Web 3.0 decentralised blockchain applications

Separation/Integration

This programme is built around David C Johnson’s 4-channel tape piece Telefun, realised in the WDR Studio for Electronic Music, Cologne. Gemini 8 is a new work by Sean Williams for Grey Area based on NASA's Gemini missions of the 1960s which paved the way for the Apollo missions to the moon. Gemini 8, piloted by Neil Armstrong, was the first manned space mission in which two spacecraft, launched an hour and a half apart, successfully docked with one another, although not without almost catastrophic problems and the forced aborting of the mission. This was the practical application of technology that was going on outside the studio whilst others were toiling away, crafting some of the finest electronic music made to date. Gemini 8 is a structured improvisation, so aside from this structure, equal creative input is given by each player. David C Johnson occupies a rare position in 20th Century music history, having worked with many composers and musicians from Lachenmann to avant rock band Can. From 1966-1970 he worked at the WDR Studios for Electronic Music in Cologne, assisting Karlheinz Stockhausen with the realisation of Hymnen and other works, and was one of the musicians who performed for 6 months in the West German pavilion of the 1970 World's Fair in Osaka. In 1970 during the World’s Fair in Osaka, Johnson, along with Rolf Gehlhaar and Johannes Fritsch separated from Stockhausen to set up the Feedback Studio out of which a wide range of innovative music practices and research flourished, including more open ideas about the role of the composer, especially in sound art and more cybernetic audio practices. Telefun was composed and realised during a break in the realisation of Hymnen when Stockhausen was in Tokyo creating Telemusik. The piece allows for a number of interruptions, the first of which will be: Toccatina by Helmut Lachenmann, performed by Emma Lloyd, is a short study for solo violin. The piece explores some of the more peculiar sounds in the violin’s timbral range, including notes played with the screw of the bow and sounds made by bowing the tail-piece, bridge, tuning pegs and scroll. Karlheinz Stockhausen’s Klavierstück XVI was written for piano or synthesizer as a scene from Friday from the Licht operas and is our second interruption to Johnson’s Telefun. Simon Smith plays his own realisation for synthesizer and is accompanied by the 4-channel tape version. PIANO PIECE XVI does not demand virtuosity, but rather, imagination and a sense of humour. It is up to the pianist to decide how many and which notes of the tape he (she) synchronously plays. At a given moment, there are many different possibilities. Our third interruption is a realisation of Yoko Ono’s 1963 Tape Piece III: Snow Piece: Take a tape of the sound of the snow falling. This should be done in the evening. Do not listen to the tape. Cut it and use it as strings to tie gifts with. Make a gift wrapper, if you wish, using the same process with a phonosheet. ©Copyright Yoko Ono 1964 I started trying to realise this piece in November 2010 but my tape machine got stuck in a lift overnight as I was moving it to get near a window. It didn’t snow again in the evening that winter. I had better luck the following winter where it snowed over a couple of days, and I was luckier with my tape machine that time. Although two private gifts have been given so far, this is the first public realisation of this piece. After the final part of Telefun, we’ll have an interval, and after that… Unlimited was written by Stockhausen in 1968 as part of the Aus den Sieben Tagen text pieces and was performed by the ensemble on various occasions. Separation from Mary Bauermeister triggered the crisis that was the backdrop for the composition of these text pieces. Questions of distributed creativity and the roles of interpretation and performance surrounding these text-based works contributed to the separation of Gehlhaar, Fritsch and Johnson from Stockhausen's ensemble to form the Feedback Studio in 1970. This piece can last for a very long time... Sean Williams, April 2014 Contributors: Simon Smith – synthesizer Grey Area: Nikki Moran - viola Emma Lloyd - violin Owen Green - bowed box Armin Sturm - double bass Shiori Usui - piano frame and voice Sean Williams - synthesizer and sound projectio

Numerical integration of the contravariant integral form of the Navier–Stokes equations in time-dependent curvilinear coordinate systems for three-dimensional free surface flows

We propose a three-dimensional non-hydrostatic shock-capturing numerical model for the simulation of wave propagation, transformation and breaking, which is based on an original integral formulation of the contravariant Navier–Stokes equations, devoid of Christoffel symbols, in general time-dependent curvilinear coordinates. A coordinate transformation maps the time-varying irregular physical domain that reproduces the complex geometries of coastal regions to a fixed uniform computational one. The advancing of the solution is performed by a second-order accurate strong stability preserving Runge–Kutta fractional-step method in which, at every stage of the method, a predictor velocity field is obtained by the shock-capturing scheme and a corrector velocity field is added to the previous one, to produce a non-hydrostatic divergence-free velocity field and update the water depth. The corrector velocity field is obtained by numerically solving a Poisson equation, expressed in integral contravariant form, by a multigrid technique which uses a four-colour Zebra Gauss–Seidel line-by-line method as smoother. Several test cases are used to verify the dispersion and shock-capturing properties of the proposed model in time-dependent curvilinear grids

Choosing integration points for QCD calculations by numerical integration

I discuss how to sample the space of parton momenta in order to best perform the numerical integrations that lead to a calculation of three jet cross sections and similar observables in electron-positron annihilation.Comment: 25 pages with 8 figure

Two \u27Cop-Outs\u27 in Faith-Learning Integration: Incarnational Integration and Worldviewish Integration

There are at least six different approaches to integration adopted by educationalists in recent years. These interconnect and may partially overlap. Two kinds of confusion in talk of integration are identified, along with four other substantive questions that would-be faith-learning, integrationists need to address. Neither incarnational integration nor perspectival integration are adequate on their own. Evangelical and Reformed traditions are both at their best when they combine incarnational and perspectival in their efforts to integrate faith and learning

Information Integration - the process of integration, evolution and versioning

At present, many information sources are available wherever you are. Most of the time, the information needed is spread across several of those information sources. Gathering this information is a tedious and time consuming job. Automating this process would assist the user in its task. Integration of the information sources provides a global information source with all information needed present. All of these information sources also change over time. With each change of the information source, the schema of this source can be changed as well. The data contained in the information source, however, cannot be changed every time, due to the huge amount of data that would have to be converted in order to conform to the most recent schema.\ud In this report we describe the current methods to information integration, evolution and versioning. We distinguish between integration of schemas and integration of the actual data. We also show some key issues when integrating XML data sources