617 research outputs found
Intercropping in maize silage versus solo-seeding for alfalfa establishment in Wisconsin and Idaho
Alfalfa (Medicago sativa L.) intercropping with maize (Zea mays L.) silage is being
developed in the northern United States to improve the profitability and environmental
sustainability of forage production. This study, conducted under rainfed conditions
inWisconsin and semiarid irrigated conditions in Idaho, compared the establishment
of alfalfa and dry matter yield of four intercropping systems to three conventional
systems. The former systems included alfalfa interseeded at planting or the vegetative
emergence (VE) stage of maize and grown with or without prohexadione
growth retardant. The latter systems included alfalfa seeded in spring, summerseeded
after barley (Hordeum vulgare L.), or late summer-seeded after maize silage.
Spring seeded and interseeded alfalfa inWisconsin also received foliar fungicide and
insecticide during establishment. During alfalfa establishment, yield of intercropped
maize silage was 1.8- to 4.4-fold greater than spring-seeded alfalfa. Compared to
spring-seeded alfalfa, interseeded alfalfa had similar or somewhat lower stand density
but similar first cut yield the following year, provided that intercropped maize
was harvested near September 1 to allow ample alfalfa fall regrowth. Shifting interseeding
from maize planting to the VE stage decreased early-season alfalfa growth,
but improved maize silage yield, with minor effects on alfalfa fall growth, stand
density, and first cut yield. Prohexadione application had little impact on establishment
or yield of interseeded alfalfa. While having high plant density, alfalfa seeded
after barley or especially maize had less fall growth and low first cut yield. Overall,
alfalfa establishment and yield of intercropping systems compared favorably with
conventional systems
Patterns and associations between dominant crop productions and water quality in an irrigated watershed
Irrigation consumes the largest share of freshwater resources but is a necessary practice to boost agricultural output to meet increasing global demand for food and fiber. Irrigation not only impacts water quantity but can also degrade water quality. Research efforts have explored various aspects of irrigation efficiency and irrigated crop productivity, but few studies have examined how different crops collectively modulate water utilization and water quality at the watershed scale. In this study long-term water quantity and quality monitoring data collected as part of the Conservation Effect Assessment Project (CEAP) combined with crop and evapotranspiration (ET) modeling products were used to elucidate relationships between crop and water processes in an irrigated watershed. We use a correlational approach to build relationships between water quantity and quality metrics and the fractional volumes of ET associated with major crops in the Twin Falls Canal Company irrigation tract. Results suggest that sub-watershed size and subsurface flow contribution in drainage tunnels influenced hydrologic patterns observed and led to 2 distinct groups. Group 1 sub-watersheds were large, typically included subsurface drain tunnels and had high return flow volumes and low sediment concentration while group 2 sub-watersheds were smaller in size, had low return flow volumes and high sediment concentration. Irrigation return flow volume normalized by sub-watershed area was positively associated with ET fractions of potato (Solanum tuberosum) in group 1 during the spring and summer months. Spring sediment loss per return flow volume showed a negative association with ET fractions of sugar beet and combined alfalfa (Medicago sativa) and pasture crops in group 2. A negative association was found between phosphorus (P) load per return flow volume and ET fractions of alfalfa / pasture, corn (Zea mays), dry beans (Phaseolus vulgaris), and sugar beet (Beta vulgaris) across sub-watershed groups. Nitrate (NO3-N) load per return flow volume was negatively associated with potato and corn ET fractions in group 1 especially during the spring and fall month but positively associated with dry beans over the irrigation season. While direct cause and effect were not established between crops and water quantity and quality, results from this study provide valuable information on management factors associated with various crop production systems that may control observed hydrologic response. Example of factors considered in explaining some of the observed patterns include early germination and ground coverage, tight control on soil water content, and the erosion attenuation effect of sedimentation ponds
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Advanced PFBC transient analysis
Transient modeling and analysis of Advanced Pressurized Fluidized Bed Combustion (PFBC) systems is a research area that is currently under investigative study by the United States Department of Energy`s Morgantown Energy Technology Center (METC). The object of the effort is to identify key operating parameters affecting plant performance and then quantify the basic response of major sub-systems to changes in operating conditions. PC-TRAX, a commercially available dynamic software program, was chosen and applied in this modeling and analysis effort. This paper summarizes and describes the development of a series of TRAX-based transient models of Advanced PFBC power plants. These power plants generate a high temperature flue gas by burning coal or other suitable fuel in a PFBC. The high temperature flue gas supports low-Btu fuel gas or natural gas combustion in a gas turbine topping combustor. When utilized, low-Btu fuel gas is produced in a bubbling bed carbonizer. High temperature, high pressure combustion products exiting the topping combustor are expanded in a modified gas turbine to generate electrical power. Waste heat from the system is used to generate and superheat steam for a reheat steam turbine bottoming cycle that generates additional electrical power. Basic control/instrumentation models were developed and modeled in PC-TRAX and used to investigate off-design plant performance. System performance for various transient conditions and control philosophies was studied
Langevin Simulations of Two Dimensional Vortex Fluctuations: Anomalous Dynamics and a New -exponent
The dynamics of two dimensional (2D) vortex fluctuations are investigated
through simulations of the 2D Coulomb gas model in which vortices are
represented by soft disks with logarithmic interactions. The simulations
trongly support a recent suggestion that 2D vortex fluctuations obey an
intrinsic anomalous dynamics manifested in a long range 1/t-tail in the vortex
correlations. A new non-linear IV-exponent a, which is different from the
commonly used AHNS exponent, a_AHNS and is given by a = 2a_AHNS - 3, is
confirmed by the simulations. The results are discussed in the context of
earlier simulations, experiments and a phenomenological description.Comment: Submitted to PRB, RevTeX format, 28 pages and 13 figures, figures in
postscript format are available at http://www.tp.umu.se/~holmlund/papers.htm
Moving on from Weiser's Vision of Calm Computing: engaging UbiComp experiences
A motivation behind much UbiComp research has been to make our lives convenient, comfortable and informed, following in the footsteps of Weiser's calm computing vision. Three themes that have dominated are context awareness, ambient intelligence and monitoring/tracking. While these avenues of research have been fruitful their accomplishments do not match up to anything like Weiser's world. This paper discusses why this is so and argues that is time for a change of direction in the field. An alternative agenda is outlined that focuses on engaging rather than calming people. Humans are very resourceful at exploiting their environments and extending their capabilities using existing strategies and tools. I describe how pervasive technologies can be added to the mix, outlining three areas of practice where there is much potential for professionals and laypeople alike to combine, adapt and use them in creative and constructive ways
Azimuthal asymmetries in lepton-pair production at a fixed-target experiment using the LHC beams (AFTER)
A multi-purpose fixed-target experiment using the proton and lead-ion beams
of the LHC was recently proposed by Brodsky, Fleuret, Hadjidakis and Lansberg,
and here we concentrate our study on some issues related to the spin physics
part of this project (referred to as AFTER). We study the nucleon spin
structure through and processes with a fixed-target experiment using
the LHC proton beams, for the kinematical region with 7 TeV proton beams at the
energy in center-of-mass frame of two nucleons GeV. We calculate
and estimate the azimuthal asymmetries of unpolarized and
dilepton production processes in the Drell--Yan continuum region and at the
-pole. We also calculate the , and
azimuthal asymmetries of and dilepton production
processes with the target proton and deuteron longitudinally or transversally
polarized in the Drell--Yan continuum region and around resonances region.
We conclude that it is feasible to measure these azimuthal asymmetries,
consequently the three-dimensional or transverse momentum dependent parton
distribution functions (3dPDFs or TMDs), at this new AFTER facility.Comment: 15 pages, 40 figures. Version accepted for publication in EPJ
Structural, electronic, and magneto-optical properties of YVO
Optical and magneto-optical properties of YVO single crystal were studied
in FIR, visible, and UV regions. Two structural phase transitions at 75 K and
200 K were observed and established to be of the first and second order,
respectively. The lattice has an orthorhombic symmetry both above 200 K
as well as below 75 K, and is found to be dimerized monoclinic in
between. We identify YVO as a Mott-Hubbard insulator with the optical gap
of 1.6 eV. The electronic excitations in the visible spectrum are determined by
three -bands at 1.8, 2.4, and 3.3 eV, followed by the charge-transfer
transitions at about 4 eV. The observed structure is in good agreement with
LSDA+ band structure calculations. By using ligand field considerations, we
assigned these bands to the transitions to the , , and states. The strong temperature dependence of these
bands is in agreement with the formation of orbital order. Despite the small
net magnetic moment of 0.01 per vanadium, the Kerr effect of the order
of was observed for all three -bands in the magnetically
ordered phase . A surprisingly strong enhancement of
the Kerr effect was found below 75 K, reaching a maximum of . The
effect is ascribed to the non-vanishing net orbital magnetic moment.Comment: Submitted to Phys. Rev.
Level models of continuing professional development evaluation: a grounded review and critique
Continuing professional development (CPD) evaluation in education has been heavily influenced by ‘level models’, deriving from the work of Kirkpatrick and Guskey in particular, which attempt to trace the processes through which CPD interventions achieve outcomes. This paper considers the strengths and limitations of such models, and in particular the degree to which they are able to do justice to the complexity of CPD and its effects. After placing level models within the broader context of debates about CPD evaluation, the paper reports our experience of developing such models heuristically for our own evaluation practice. It then draws on positivist, realist and constructivist traditions to consider some more fundamental ontological and epistemological questions to which they give rise. The paper concludes that level models can be used in a number of ways and with differing emphases, and that choices made about their use will need to reflect both theoretical choices and practical considerations
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