Resonant Interactions Between Protons and Oblique Alfv\'en/Ion-Cyclotron Waves

Resonant interactions between ions and Alfv\'en/ion-cyclotron (A/IC) waves may play an important role in the heating and acceleration of the fast solar wind. Although such interactions have been studied extensively for "parallel" waves, whose wave vectors ${\bf k}$ are aligned with the background magnetic field ${\bf B}_0$, much less is known about interactions between ions and oblique A/IC waves, for which the angle $\theta$ between ${\bf k}$ and ${\bf B}_0$ is nonzero. In this paper, we present new numerical results on resonant cyclotron interactions between protons and oblique A/IC waves in collisionless low-beta plasmas such as the solar corona. We find that if some mechanism generates oblique high-frequency A/IC waves, then these waves initially modify the proton distribution function in such a way that it becomes unstable to parallel waves. Parallel waves are then amplified to the point that they dominate the wave energy at the large parallel wave numbers at which the waves resonate with the particles. Pitch-angle scattering by these waves then causes the plasma to evolve towards a state in which the proton distribution is constant along a particular set of nested "scattering surfaces" in velocity space, whose shapes have been calculated previously. As the distribution function approaches this state, the imaginary part of the frequency of parallel A/IC waves drops continuously towards zero, but oblique waves continue to undergo cyclotron damping while simultaneously causing protons to diffuse across these kinetic shells to higher energies. We conclude that oblique A/IC waves can be more effective at heating protons than parallel A/IC waves, because for oblique waves the plasma does not relax towards a state in which proton damping of oblique A/IC waves ceases

A genre–based study of case response writing on an MBA programme.

Case-based assignments represent a common form of assessment on academic business programmes (Easton 1982 and Mauffette-Leenders, Erskine and Leenders 1997), with students required to generate amongst other responses, business case reports, case critiques and case analyses (Nathan 2013). Only limited research is available to support academic writing tutors in understanding such case response texts with published studies focusing solely on business case reports (Freedman and Adam 1994, Forman and Rymer 1999a, 1999b and Nathan 2013). In order to aid writing tutors in supporting academic business students, this paper presents a small corpus study of 36 case response non-report texts (ca. 40000 words), generated on a UK MBA programme. These texts represent categories designated case critique, case advisory and case comparison texts, and were written in three business specialisms, Marketing, Human Resource Management, and Finance, respectively. Rhetorical analysis identified variable rhetorical structure dependent on text category, although orientation, analytical and conclusion components were present at high frequency in all text categories. Substantial variability in citation frequencies, modal verb, business lexis, and first person pronoun deployment was also identified between text categories. Awareness of both similarities and differences in case-based writing responses should serve as a useful aid in informing academic writing pedagogy

Firm investment and monetary policy transmission in the Euro Area

This paper presents a comparable set of results on the monetary transmission channels on firm investment (the interest rate channel and the broad credit channel) for the four largest euro-areacountries (Germany, France, Italy and Spain), using particularly rich micro datasets for eachcountry containing over 215,000 observations from 1985 to 1999. For each of those countries,investment relationships are estimated explaining investment by its user cost, sales and cash flow.A first result is that investment is sensitive to user cost changes in all those four countries. Thisimplies an operative interest channel in these euro-area countries. A second result is that investmentin all countries is quite sensitive to cash flow movements. However, only in Italy do smaller firmsreact more to cash flow movements than large firms, implying that a broad credit channel might notbe equally pervasive in all countries.Investment, Monetary Transmission Channels, User Cost of Capital

New Findings on Firm Investment and Monetary Policy Transmission in the Euro Area

In this paper we present comparable results on the determinants of firms' investment and their link to monetary policy. The results have been obtained by the Eurosystem Monetary Transmission Network. This network has produced a series of papers in which the use of micro data permits estimating and quantifying the relevance of two channels of monetary policy transmission: the nterest rate and the broad credit channel. The research findings provide evidence of an operative interest rate channel in all countries examined. Moreover, the results indicate that variables which proxy firms' financial conditions play a role. Firms characterised by weaker balance sheetsshow higher liquidity sensitivity.investment, monetary transmission, user cost of capital

Firm Investment and Monetary Policy Transmission in the Euro Area

We present a comparable set of results on the monetary transmission channels on firm investment for the four largest euro-area countries (Germany, France, Italy and Spain). With particularly rich micro datasets for each country containing over 215,000 observations from 1985 to 1999, we explore what can be learned about the interest channel and the broad credit channel. For each of those countries, we estimate neo-classical investment relationships, explaining investment by its user cost, sales and cash flow. We find investment to be sensitive to user cost changes in all those four countries. This implies an operative interest channel in these euro-area countries. We also find investment in all countries to be quite sensitive to cash flow movements. However, only in Italy do smaller firms react more to cash flow movements than large firms, implying that a broad credit channel might not be equally pervasive in all countries.investment, monetary transmission, user cost of capital

Firm Investment and Monetary Policy Transmission in the Euro Area

We present a comparable set of results on the monetary transmission channels on firm investment for the four largest euro-area countries (Germany, France, Italy and Spain). With particularly rich micro datasets for each country containing over 215,000 observations from 1985 to 1999, we explore what can be learned about the interest channel and the broad credit channel. For each of those countries, we estimate neoclassical investment relationships, explaining investment by its user cost, sales and cash flow. We find investment to be sensitive to user cost changes in all those four countries. This implies an operative interest channel in these euro-area countries. We also find investment in all countries to be quite sensitive to cash flow movements. However, only in Italy do smaller firms react more to cash flow movements than large firms, implying that a broad credit channel might not be equally pervasive in all countries. -- In einer vergleichenden Betrachtung untersuchen wir die Kanäle monetärer Transmission bezüglich des einzelwirtschaftlichen Investitionsverhaltens in den vier größten Ländern des Euro-Währungsraums (Deutschland, Frankreich, Italien und Spanien). Bei unserer Untersuchung des Zinskanals und des Kreditkanals können wir auf ausgesprochen reiche Datensätze mit insgesamt 215.000 Beobachtungen zurückgreifen. Für jedes dieser Länder schätzen wir neoklassische Investitionsgleichungen, bei denen das Investitionsverhalten durch die Kapitalnutzungskosten, den Absatz und den cash flow erklärt werden. In allen vier Ländern reagiert das Investitionsverhalten auf Änderungen der Kapitalnutzungskosten. Dies zeigt die Wirksamkeit eines Zinskanals in diesen Ländern. Weiterhin erweist sich in allen Ländern der betriebliche cash flow als wichtige Determinante für das Investitionsverhalten. Allerdings reagieren nur in Italien kleine Firmen stärker auf Änderungen des cash flows als große Firmen. Dies läßt darauf schließen, daß der Kreditkanal der monetären Transmission nicht in allen Ländern von gleicher Bedeutung ist.Investition,Monetäre Transmission,Kapitalnutzungskosten,investment,monetary transmission,user cost of capital

Firm investment and monetary transmission in the euro area

We present a comparable set of results on the monetary transmission channels on firm investment for the four largest countries of the euro area (Germany, France, Italy and Spain). With particularly rich micro datasets for each country containing over 215,000 observations from 1985 to 1999, we explore what can be learned on the interest channel and broad credit channel. For each of those countries we estimate neo-classical investment relationships, explaining investment by its user cost, sales and cash flow. We find investment to be sensitive to user cost changes in all those four countries. This implies an operative interest channel in these euro area countries. We also find investment in all those countries to be quite sensitive to cash flow movements. However we find that only in Italy smaller firms react more to cash flow movements, implying that a broad credit channel might not be as pervasive in all countries JEL Classification: E22, E50Investment, monetary transmission channels, user cost of capital