2,776 research outputs found
Tony Schmidt oral history recording on Rodgers Instruments
Full text linkAn audio recording of an oral history of Tony Schmidt on the Silicon Forest and Rodgers Instruments, a digital music organ company. Topics include: his education as an accountant; the culture at Rodgers; working his way up from Accounting Manager to Chief Financial Officer beginning in 1989; the relationship between Rodgers and Roland Corporation; the origins of the Rodgers company in 1958; technological advancements in electronic organ design; environmental compliance issues; the market for organs centered on churches; changes to traffic and the landscape of Washington County between the 1980s-2000s as technology companies grew; and other topics. There is a transcript of this interview
Growth and yield responses in maize to split and delayed fertilizer applications on sandy soils under high rainfall regimes
Full text linkThe yield of maize (Zea mays L.) on sandy soils with high rainfall regimes is generally low due to poor nutrient use efficiency. Split and delayed basal fertilizer applications are possible strategies to improve the crop yield and reduce nutrient loss through leaching in sandy soils, but their effectiveness under high rainfall regimes to produce a maize growth response needs further investigation. The aim of the study was to determine the effect of fertilizer application methods on the growth, yield and agronomic characteristics of maize on a sandy soil with approximately 1,350 mm of rainfall during crop growth. Field experiments were conducted on Oxic Paleustults (Korat series) with a low cation exchange capacity (CEC) of 2–4 cmol kg–1. Three to four split applications of the fertilizer increased the grain yield from 2.7 to 3.3–4.5 Mg ha–1. There was a greater crop growth rate (CGR) and relative growth rate (RGR) with the split applications of fertilizer during 30–60 d after emergence (DAE). The highest agronomic efficiency (AE) resulted from a three-split application. However, application of fertilizer later than 45 DAE had only a low effective rate. Delaying the basal fertilizer application to 7–15 DAE increased the grain yield to 3.5–3.7 Mg ha–1, whereas a pre–planting application produced a yield of 2.7 Mg ha–1. Delaying the basal fertilizer application to 7–15 DAE improved the CGR, RGR and AE. These results indicated that fertilizer applications to minimize nutrient loss increased the growth and nutrient use efficiency of maize on sandy soil in a high rainfall regime
Photocatalysis to promote cell-free biocatalytic reactions
No full textCofactors assist enzymes to catalyze reactions and are indispensable and ubiquitous in nature, playing a central role in metabolic pathways. In biocatalysis, common redox cofactors such as nicotinamide, flavin and heme can be activated by light or synthetized to vary redox potentials, leading to different types of reactions for the formation of interesting chiral products, unattainable through classical chemical methods. This chapter will focus on light-driven cell-free biocatalytic reactions activated via their redox cofactors.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.BT/Biocatalysi
Non-discursive knowledge and the construction of identity. Potters, potting and performance at the bronze age tell of Százhalombatta, Hungary
Full text linkThis article explores the relationship between the making of things and the making of people at the Bronze Age tell at Százhalombatta, Hungary. Focusing on potters and potting, we explore how the performance of non-discursive knowledge was critical to the construction of social categories. Potters literally came into being as potters through repeated bodily enactment of potting skills. Potters also gained their identity in the social sphere through the connection between their potting performance and their audience. We trace degrees of skill in the ceramic record to reveal the material articulation of non-discursive knowledge and consider the ramifications of the differential acquisition of non-discursive knowledge for the expression of different kinds of potter's identities. The creation of potters as a social category was essential to the ongoing creation of specific forms of material culture. We examine the implications of altered potters' performances and the role of non-discursive knowledge in the construction of social models of the Bronze Ag
Grassland management, soil biota and ecosystem services in sandy soils
No full textRecent legislative restrictions on the use of fertilizers and irrigation, and a quest for sustainable farming systems have drawn renewed attention to the functioning of the soil and the ecosystem services it provides. Soil biota play an important role in the provision of these ecosystem services, which may be influenced by grassland management. The two objectives of this thesis were 1) to gain insight into the effect of different grassland management measures on soil biota in sandy soils; and 2) to explore the effect of grassland management on the ecosystem services provided by soil biota
Structural analysis and parametric study ballasted track in sandy regions
No full textThe sand intrusion in railway tracks in sandy regions can significantly change the mechanical behaviour of tracks and thus threaten the safety of train operation. This paper presents substantial field tests on both sandy and clean railway tracks to study the effect of sand intrusion on the longitudinal resistance of ballast bed and the vibration behaviour of track structures. After that, a 3D multi-scale the discrete element model is developed to study the micro-contact between ballast particles and the vibration behaviour of sandy tracks during train passing in detail. Also, the effect of train speeds and axle loads on the mechanical behaviour of sandy tracks is discussed. The results show that the sand intrusion increases the vibration acceleration amplitude of rail and sleeper by 11.3% and 50.3%, while ballast bed decreases by 44.9%. Besides, the sand intrusion significantly changes the energy distribution in the track, wherein the frequencies of the highest energy of rail and sleeper are increased while that of the ballast bed is decreased. The parametric study shows the high train speed can cause the increase in overall acceleration of the ballast bed and high axle load can cause an increase in the micro-contact forces between ballast particles, diffusion angle of the contact force chain, displacements of ballast particles, acceleration of ballast particles, and sleeper displacements.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Mechanics and Physics of Structure
Crushed rock and clay amelioration of a nutrient decifient, sandy soil of Maputaland
No full textBibliography: leaves 57-62.Various studies have suggested the possibility that food derived through subsistence agriculture in the Mseleni region of Maputaland contributes to malnutrition within the local community, particularfy within the high proportion of the population which suffers from a severe, disabling form of osteoarthritis. This study was conducted to determine if the application of local crushed rock or black clay to these nutrient deficient, sandy soils would increase available nutrient concentrations and improve the growth of plants in the ameliorated soil
The Europeanization of Interest Representation: A Strategic Decision-Making Analysis of UK Business and Environmental Interests
Full text linkThe point of departure for this paper is that the European Union (EU) has affected national politics, policies and polities. This process, labelled Europeanization, has led to changes in two interconnected political dimensions. First, it has led to modifications in the relationships between state and non-state actors within the national arena. Second, it has changed the interactions between the sub-national, national and supranational actors (state and non-state). To explore these propositions the paper conducts an analysis of the interest representation patterns exhibited by non-state actors. The paper compares firms (in the telecommunications, gas and electricity sectors) and environmental groups (focused on nature conservation or biodiversity policy), both based in the United Kingdom (UK), in order to determine how, to what extent and why Europeanization has affected their interest representation behaviour. The activities displayed by the two sets of interests are compared and contrasted in terms of chosen lobbying targets (i.e. national government departments and EU institutions), routes and allies (i.e. direct contact or via intermediaries such as Euro-groups) and the timing and character of the contact. Ideas and tools drawn from management science (i.e. strategic decision making analyses) are employed to assist in deriving the causal explanations for the Europeanized patterns of behaviour. It is argued that a combination of the three strategic decision making factors (i.e. internal organizational resources, objectives (and perceived rewards) and external political environments explain the contrasting behaviour of the firms and environmental groups
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