On the structural changes in the Brewer-Dobson circulation after 2000

In this paper we present evidence that the observed increase in tropical upwelling after the year 2000 may be attributed to a change in the Brewer-Dobson circulation pattern. For this purpose, we use the concept of transit times derived from residual circulation trajectories and different in-situ measurements of ozone and nitrous dioxide. Observations from the Canadian midlatitude ozone profile record, probability density functions of in-situ N2O observations and a shift of the N2O-O3 correlation slopes, taken together, indicate that the increased upwelling in the tropics after the year 2000 appears to have triggered an intensification of tracer transport from the tropics into the extratropics in the lower stratosphere below about 500 K. This finding is corroborated by the fact that transit times along the shallow branch of the residual circulation into the LMS have decreased for the same time period (1993–2003). On a longer time scale (1979–2009), the transit time of the shallow residual circulation branch show a steady decrease of about −1 month/decade over the last 30 years, while the transit times of the deep branch remain unchanged. This highlights the fact that a change in the upwelling across the tropical tropopause is not a direct indicator for changes of the whole Brewer-Dobson circulation

Wachstumsdeterminanten junger Unternehmen in den alten und neuen Bundesländern: Ein Vergleich zwischen innovativen und nicht-innovativen Unternehmen

Die vorliegende Studie untersucht, ob unternehmensspezifische und unternehmensexterne Determinanten das Beschäftigungswachstum von innovativen und nicht-innovativen Unternehmen in den alten und neuen Bundesländern unterschiedlich beeinflussen. Die Ergebnisse der multivariaten Analysen zur Beschäftigungsdynamik junger Unternehmen lassen erkennen, daß junge innovative Unternehmen signifikant höhere Wachstumsraten erzielen verglichen mit jungen Unternehmen, die in traditionellen Wirtschaftszweigen tätig sind (nicht-innovative Unternehmen). Beide Unternehmensgruppen wachsen im Untersuchungszeitraum zwischen 1992 und 1996 in den alten Bundesländern im Durchschnitt schneller als in den neuen Bundesländern. In beiden Regionen ist zudem eine erhebliche Ungleichverteilung der Wachstumsbeiträge junger Unternehmen zu erkennen. Nur ein geringer Anteil der Unternehmen zeichnet sich durch überdurchschnittliches Wachstum aus

Properties of Relativistic Bouncing Microbursts

Microbursts are short duration intensifications in precipitating electron flux that are believed to be a significant contributor to electron losses in the magnetosphere. Microbursts have been observed in the form of bouncing electron packets, which offer a unique opportunity to study the properties of microbursts and their importance as a loss process. We present a collection of bouncing microbursts observed by the HILT instrument on SAMPEX from 1994-2004.We analyze the locations of the bouncing microbursts in L and MLT and find they align well with the properties of relativistic microbursts as a whole. We find that that the majority of bouncing microbursts observed by SAMPEX have scale sizes of 30km at the point of observation, or about 1500km when mapped to the equator.The time separation between the peaks of these bouncing microbursts is usually either half a bounce period or a whole bounce period

Wachstumsdeterminanten junger Unternehmen in den alten und neuen Bundesländern: Ein Vergleich zwischen innovativen und nicht-innovativen Unternehmen

The paper deals with growth determinants of innovative and noninnovative start-ups in Eastern and Western Germany. Based on theoretical approaches explaining the growth of firms, hypotheses on potential determinants are derived. The empirical results indicate strong correlations between average annual growth rates on the one side and firm-specific as well as external factors on the other side, influencing growth of start-ups in Eastern and Western Germany in different strength. Higher growth rates can be observed in firms from Western Germany compared with their Eastern German counterparts. Comparing the average growth rates, innovative firms achieve significantly higher rates than noninnovative start-ups in both regions. --Innovative Unternehmen,Gründungen,Wachstumsdeterminanten

Extension’s Response to the Change in Public Value: Considerations for Ensuring Financial Security for the Cooperative Extension System

Cooperative Extension is a partnership of county, state, and federal governments to fund the translation and community education of applied research from the land-grant university system. Cooperative Extension’s funding since the 1980s has experienced a few key trends such as federal budget stagnation as well as state and county cyclic funding cycles based on the states’ economic health. Accompanying the state-level budget cuts have been calls for Cooperative Extension to reinvent and improve communication about what it does. As budget stability has become a greater concern, ideas around value and return on investment have become more integrated into the messaging about why Cooperative Extension should be funded. These economic terms reflect the integration of neoliberalism’s frame. In a larger qualitative research study about how Cooperative Extension administrators recognize the need for change, funding emerged as a fundamental influence of organization adaptation. The public contract between citizen, legislature, and public-serving organizations has changed to, “What is the return on investment?” To respond to the shifting narrative, it was necessary to assess, measure, and communicate value. However, administrators also recognized relationships mattered to how the message was received by legislators and other funders

Investigation of Seal-to-Floor Effects on Semi-Span Transonic Models

In an effort to achieve the maximum possible Reynolds number (Re) when conducting production testing for flight loads aerodynamic databases, it has been the preferred practice of The Boeing Company / Commercial Airplanes (BCA) -- Loads and Dynamics Group since the early 1990's to test large scale semi-span models in the 11- By 11-Foot Transonic Wind Tunnel (TWT) leg of the Unitary Plan Wind Tunnel (UPWT) at the NASA Ames Research Center (ARC). There are many problems related to testing large scale semi-span models of high aspect ratio flexible transport wings, such as; floor boundary layer effects, wing spanwise wall effects, solid blockage buoyancy effects, floor mechanical interference effects, airflow under the model effects, or tunnel flow gradient effects. For most of these issues, BCA has developed and implemented either standard testing methods or numerical correction schemes and these will not be discussed in this document. Other researchers have reported on semi-span transonic testing correction issues, however most of the reported research has been for low Mach testing. Some of the reports for low Mach testing address the difficult problem of preventing undesirable airflow under a semi-span model while ensuring unrestricted main balance functionality, however, for transonic models this issue has gone unresolved. BCA has been cognizant for sometime that there are marked differences in wing pressure distributions from semi-span transonic model testing than from full model or flight testing. It has been suspected that these differences are at least in part due to airflow under the model. Previous efforts by BCA to address this issue have proven to be ineffective or inconclusive and in one situation resulted in broken hardware. This paper reports on a Boeing-NASA collaborative investigation based on a series of small tests conducted between June 2006 and November 2007 in the 11 by 11 foot Transonic Wind Tunnel at NASA Ames on three large commercial jet transport configurations to assess the effects of sealing a semi-span model to the floor and to investigate efficient sealing and testing techniques. This document will show how sealing the model to the floor has a small but remarkably far reaching spanwise effect on wing pressures, wing local section forces and wing force summations

Thermodynamic and Tunneling Density of States of the Integer Quantum Hall Critical State

We examine the long wave length limit of the self-consistent Hartree-Fock approximation irreducible static density-density response function by evaluating the charge induced by an external charge. Our results are consistent with the compressibility sum rule and inconsistent with earlier work that did not account for consistency between the exchange-local-field and the disorder potential. We conclude that the thermodynamic density of states is finite, in spite of the vanishing tunneling density of states at the critical energy of the integer quantum Hall transition.Comment: 5 pages, 4 figures, minor revisions, published versio