Hadronic Structure Functions of the Photon Measured at LEP

The measurements of hadronic structure functions of the photon based on the reaction ee --> ee gamma^(*)(P^2) gamma^*(Q^2)--> ee hadrons are discussed.Comment: 9 pages, 6 figures, Conference contribution to DIS 2000, 25-30 April 2000, Liverpool, England, to appear in the Proceeding

What determines banks’ customer choice? Evidence from transition countries

This paper explores how bank characteristics and the institutional environment influence the composition of banks’ loan portfolios. Using a new data set based on the recent EBRD Banking Environment and Performance Survey (BEPS), which was conducted in 2005 for 220 banks in 20 transition countries, we show that bank characteristics such as ownership and size are important determinants of bank customer focus. In particular, we find that foreign banks are relatively strongly involved in mortgage lending and lending to subsidiaries of foreign companies, while lending relatively less to large domestic firms. We also find that small banks lend relatively more to SMEs than large banks do, while large banks appear to have a comparative advantage in lending to large customers. We do not find much evidence for the hypothesis that better legal credit protection changes bank portfolio composition. An exception is that banks that perceive pledge and mortgage laws to be of high quality focus more on mortgage lending.banking, portfolio composition

The Politics of Selection: Towards a Transformative Model of Environmental Innovation

As a purposive sustainability transition requires environmental innovation and innovation policy, we discuss potentials and limitations of three dominant strands of literature in this field, namely the multi-level perspective on socio-technical transitions (MLP), the innovation systems approach (IS), and the long-wave theory of techno-economic paradigm shifts (LWT). All three are epistemologically rooted in an evolutionary understanding of socio-technical change. While these approaches are appropriate to understand market-driven processes of change, they may be deficient as analytical tools for exploring and designing processes of purposive societal transformation. In particular, we argue that the evolutionary mechanism of selection is the key to introducing the strong directionality required for purposive transformative change. In all three innovation theories, we find that the prime selection environment is constituted by the market and, thus, normative societal goals like sustainability are sidelined. Consequently, selection is depoliticised and neither strong directionality nor incumbent regime destabilisation are societally steered. Finally, we offer an analytical framework that builds upon a more political conception of selection and retention and calls for new political institutions to make normatively guided selections. Institutions for transformative innovation need to improve the capacities of complex societies to make binding decisions in politically contested fields

Design Procedure for a Broadband TE11/HE11 Mode Converter for High-Power Radar Applications

The HE$_{11}$ hybrid mode, propagating in an overmoded corrugated circular waveguide, is widely used for low loss transmission of high-power microwaves. Due to the inherent broadband frequency behaviour, this will be also essential for future broadband high-power radar applications, like space debris observation in low earth orbit (LEO). A promising amplifier concept for such radar sensors is a helical gyro-TWT. However, since the HE$_{11}$ hybrid mode is not suitable for electron-beam-wave interaction in this kind of vacuum electron device, an additional mode converter is required. The present paper addresses the design procedure of a broadband high-power mode converter, designed for a helical gyro-TWT intended for future broadband high-power radar applications in the W-band. The interaction mode of the helical gyro-TWT under consideration can be easily transferred to the circular waveguide TE$_{11}$ mode. Therefore, a TE$_{11}$ ↦ HE$_{11}$ mode converter is addressed here. The design procedure is based on a scattering matrix formalism and leads to a high HE$_{11}$ mode content of ≥98.6% within the considered frequency range from 92 GHz to 100 GHz. Inside this frequency band, the mode content is even better and reaches ≈ 99.7% at ≈95 GHz. This allows broadband frequency operation of a helical gyro-TWT and is suitable for broadband high-power radar applications