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  • 1
    Online Resource
    Online Resource
    Providence :American Mathematical Society,
    Keywords: Global analysis (Mathematics). ; Vector fields. ; Differential equations, Partial. ; Manifolds. ; Fluid dynamics. ; Geophysics. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (248 pages)
    Edition: 1st ed.
    ISBN: 9781470413460
    Series Statement: Mathematical Surveys and Monographs ; v.119
    DDC: 532/.0535
    Language: English
    Note: Intro -- Contents -- Preface -- Introduction -- 0.1. Representation of Fluid Flows -- 0.2. Motivation and Main Objectives -- 0.3. The User's Guide -- Notes for Introduction -- Chapter 1. Structure Classification of Divergence-Free Vector Fields -- 1.1. Limit Set Theorem -- 1.2. Poincare-Hopf Index Theorem on Manifolds with Boundaries -- 1.3. Structural Classification -- 1.4. Topological Classification -- Notes for Chapter 1 -- Chapter 2. Structural Stability of Divergence-Free Vector Fields -- 2.1. Structural Stability of Divergence-Free Vector Fields with Free Boundary Conditions -- 2.2. Structural Stability for Divergence-Free Vector Fields with Dirichlet Boundary Conditions -- 2.3. Two Dimensional Hamiltonian Structural Stability -- 2.4. Block Structure of Hamiltonian Vector Fields -- 2.5. Local Structural Stability -- Notes for Chapter 2 -- Chapter 3. Block Stability of Divergence-Free Vector Fields on Manifolds with Nonzero Genus -- 3.1. Instability on Manifolds with Nonzero Genus -- 3.2. Block Structure and Block Stability -- 3.3. Structural Evolution of the Taylor Vortices -- Notes for Chapter 3 -- Chapter 4. Structural Stability of Solutions of Navier-Stokes Equations -- 4.1. Genericity of Stable Steady States -- 4.2. Properties for Structurally Stable Solutions on the Reynolds Numbers -- 4.3. Asymptotic Hamiltonian Structural Stability -- 4.4. Asymptotic Block Stability -- 4.5. Periodic Structure of Solutions of the Navier-Stokes Equations -- 4.6. Structure of Solutions of the Rayleigh-Benard Convection -- Notes for Chapter 4 -- Chapter 5. Structural Bifurcation for One-Parameter Families of Divergence-Free Vector Fields -- 5.1. Necessary Conditions for Structural Bifurcation -- 5.2. Structural Bifurcation for Flows with No-Normal Flow Boundary Conditions -- 5.3. Structural Bifurcation for Flows with Dirichlet Boundary Conditions. , 5.4. Boundary Layer Separations of Incompressible Flows I -- 5.5. Boundary Layer Separations of Incompressible Flows II -- 5.6. Structural Bifurcation near Interior Singular Points -- 5.7. Genericity of Structural Bifurcations -- Notes for Chapter 5 -- Chapter 6. Two Examples -- 6.1. Fluid Flow Maps and Double-Gyre Ocean Circulation -- 6.2. Boundary Layer Separation on Driven Cavity Flow -- Notes for Chapter 6 -- Bibliography -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- K -- L -- N -- O -- P -- Q -- R -- S -- T -- V.
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  • 2
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Condensed matter. ; Electronic books.
    Description / Table of Contents: This book introduces a general principle of dynamic transitions for dissipative systems, establishes a systematic dynamic transition theory, and explores the physical implications of applications of the theory to a range of problems in the nonlinear sciences.
    Type of Medium: Online Resource
    Pages: 1 online resource (575 pages)
    Edition: 1st ed.
    ISBN: 9781461489634
    DDC: 530.414
    Language: English
    Note: Intro -- Preface -- Contents -- Introduction -- 1 Introduction to Dynamic Transitions -- 1.1 First Principles and Dynamic Models -- 1.1.1 Physical Laws and Mathematical Models -- 1.1.2 Rayleigh-Bénard Convection -- 1.1.3 Mathematical Formulation of Physical Problems -- 1.2 Introduction to Dynamic Transition Theory -- 1.2.1 Motivation and Key Philosophy -- 1.2.2 Principle of Exchange of Stability -- 1.2.3 Equation of Critical Parameters -- 1.2.4 Classifications of Dynamic Transitions -- 1.2.5 Structure and Characterization of Dynamic Transitions -- 1.2.6 General Features of Dynamic Transitions -- 1.3 Examples of Typical Phase Transition Problems -- 1.3.1 Rayleigh-Bénard Convection -- 1.3.2 El Niño Southern Oscillation -- 1.3.3 Dynamic Transition Versus Transition in Physical Space -- 1.3.4 Andrews Critical Point and Third-Order Gas-Liquid Transition -- 1.3.5 Binary Systems -- 2 Dynamic Transition Theory -- 2.1 General Dynamic Transition Theory -- 2.1.1 Classification of Dynamic Transitions -- 2.1.2 Characterization of Transition Types -- 2.1.3 Local Topological Structure of Transitions -- 2.2 Continuous Transition -- 2.2.1 Finite-Dimensional Systems -- 2.2.2 S1-Attractor Bifurcation -- 2.2.3 Sm-Attractor Bifurcation -- 2.2.4 Structural Stability of Dynamic Transitions -- 2.2.5 Infinite-Dimensional Systems -- 2.3 Transition from Simple Eigenvalues -- 2.3.1 Real Simple Eigenvalues -- 2.3.2 Transitions from Complex Simple Eigenvalues -- 2.3.3 Computation of b -- 2.4 Transition from Eigenvalues with Multiplicity Two -- 2.4.1 Index Formula for Second-Order Nondegenerate Singularities -- 2.4.2 Bifurcation at Second-Order Singular Points -- 2.4.3 The Case ind (F,0)=-2 -- 2.4.4 The Case ind (F,0)=2 -- 2.4.5 The Case ind (F,0)=0 -- 2.4.6 Indices of kth-order Nondegenerate Singularities -- 2.4.7 Structure of kth-Order Nondegenerate Singularities. , 2.4.8 Transition from kth-Order Nondegenerate Singularities -- 2.4.9 Bifurcation to Periodic Orbits -- 2.4.10 Application to Parabolic Systems -- 2.5 Singular Separation -- 2.5.1 General Principle -- 2.5.2 Saddle-Node Bifurcation -- 2.5.3 Singular Separation of Periodic Orbits -- 2.6 Perturbed Systems -- 2.6.1 General Eigenvalues -- 2.6.2 Simple Eigenvalues -- 2.6.3 Complex Eigenvalues -- 2.7 Notes -- 3 Equilibrium Phase Transition in Statistical Physics -- 3.1 Dynamic Models for Equilibrium Phase Transitions -- 3.1.1 Thermodynamic Potentials -- 3.1.2 Time-Dependent Equations -- 3.2 Classification of Equilibrium Phase Transitions -- 3.3 Third-Order Gas-Liquid Phase Transition -- 3.3.1 Introduction -- 3.3.2 Time-Dependent Models for PVT Systems -- 3.3.3 Phase Transition Dynamics for PVT Systems -- 3.3.4 Physical Conclusions -- 3.4 Ferromagnetism -- 3.4.1 Classical Theory of Ferromagnetism -- 3.4.2 Dynamic Transitions in Ferromagnetism -- 3.4.3 Physical Implications -- 3.4.4 Asymmetry of Fluctuations -- 3.5 Phase Separation in Binary Systems -- 3.5.1 Modeling -- 3.5.2 Phase Transition in General Domains -- 3.5.3 Phase Transition in Rectangular Domains -- 3.5.4 Spatial Geometry, Transitions, and Pattern Formation -- 3.5.5 Phase Diagrams and Physical Conclusions -- 3.6 Superconductivity -- 3.6.1 Ginzburg-Landau Model -- 3.6.2 TGDL as a Gradient-Type System -- 3.6.3 Phase Transition Theorems -- 3.6.4 Model Coupled with Entropy -- 3.6.5 Physical Conclusions -- 3.7 Liquid Helium-4 -- 3.7.1 Dynamic Model for Liquid Helium-4 -- 3.7.2 Dynamic Phase Transition for Liquid 4He -- 3.8 Superfluidity of Helium-3 -- 3.8.1 Dynamic Model for Liquid 3He with Zero Applied Field -- 3.8.2 Critical Parameter Curves and PT-Phase Diagram -- 3.8.3 Classification of Superfluid Transitions -- 3.8.4 Liquid 3He with Nonzero Applied Field -- 3.8.5 Physical Remarks. , 3.9 Mixture of He-3 and He-4 -- 3.9.1 Model for Liquid Mixture of 3He and 4He -- 3.9.2 Critical Parameter Curves -- 3.9.3 Transition Theorems -- 3.9.4 Physical Conclusions -- 4 Fluid Dynamics -- 4.1 Rayleigh-Bénard Convection -- 4.1.1 Bénard Problem -- 4.1.2 Boussinesq Equations -- 4.1.3 Dynamic Transition Theorems -- 4.1.4 Topological Structure and Pattern Formation -- 4.1.5 Asymptotic Structure of Solutions for the BénardProblem -- 4.1.6 Structure of Bifurcated Attractors -- 4.1.7 Physical Remarks -- 4.2 Taylor-Couette Flow -- 4.2.1 Taylor Problem -- 4.2.2 Governing Equations -- 4.2.3 Narrow-Gap Case with Axisymmetric Perturbations -- 4.2.4 Asymptotic Structure of Solutions and Taylor Vortices -- 4.2.5 Taylor Problem with z-Periodic Boundary Condition -- 4.2.6 Other Boundary Conditions -- 4.2.7 Three-Dimensional Perturbation for the Narrow-GapCase -- 4.2.8 Physical Remarks -- 4.3 Boundary-Layer and Interior Separations in the Taylor-Couette-Poiseuille Flow -- 4.3.1 Model for the Taylor-Couette-Poiseuille Problem -- 4.3.2 Phase Transition of the TCP Problem -- 4.3.3 Boundary-Layer Separation from the Couette-Poiseuille Flow -- 4.3.4 Interior Separation from the Couette-Poiseuille Flow -- 4.3.5 Nature of Boundary-Layer and Interior Separations -- 4.4 Rotating Convection Problem -- 4.4.1 Rotating Boussinesq Equations -- 4.4.2 Eigenvalue Problem -- 4.4.3 Principle of Exchange of Stabilities -- 4.4.4 Transition from First Real Eigenvalues -- 4.4.5 Transition from First Complex Eigenvalues -- 4.4.6 Physical Remarks -- 4.5 Convection Scale Theory -- 5 Geophysical Fluid Dynamics and Climate Dynamics -- 5.1 Modeling and General Characteristics of Geophysical Flows -- 5.2 El Niño-Southern Oscillation -- 5.2.1 Walker Circulation and ENSO -- 5.2.2 Equatorial Circulation Equations -- 5.2.3 Walker Circulation Under Idealized Conditions. , 5.2.4 Walker Circulation Under Natural Conditions -- 5.2.5 ENSO: Metastable Oscillation Theory -- 5.3 Thermohaline Ocean Circulation -- 5.3.1 Boussinesq Equations -- 5.3.2 Linear Analysis -- 5.3.3 Nonlinear Dynamic Transitions -- 5.3.4 Convection Scales and Dynamic Transition -- 5.4 Arctic Ocean Circulations -- 5.4.1 Model -- 5.4.2 Linear Theory -- 5.4.3 Transition Theorems -- 5.4.4 Revised Transition Theory -- 5.4.5 Physical Conclusions -- 5.5 Large-Scale Meridional Atmospheric Circulation -- 5.5.1 Polar, Ferrel, and Hadley Cells -- 5.5.2 -Plane Assumption -- 5.5.3 Meridional Circulation Under Idealized Conditions -- 5.5.4 Physical Implications -- 6 Dynamical Transitions in Chemistry and Biology -- 6.1 Modeling -- 6.1.1 Dynamical Equations of Chemical Reactions -- 6.1.2 Population Models of Biological Species -- 6.2 Belousov-Zhabotinsky Chemical Reactions: Oregonator -- 6.2.1 The Field-Korös-Noyes Equations -- 6.2.2 Transition Under the Dirichlet Boundary Condition -- 6.2.3 Transitions Under the Neumann Boundary Condition -- 6.2.4 Phase Transition in the Realistic Oregonator -- 6.3 Belousov-Zhabotinsky Reactions: Brusselator -- 6.3.1 Prigogine-Lefever Model -- 6.3.2 Linearized Problem -- 6.3.3 Transition from Real Eigenvalues -- 6.3.4 Transition from Complex Eigenvalues -- 6.4 Bacterial Chemotaxis -- 6.4.1 Keller-Segel Models -- 6.4.2 Dynamic Transitions for a Rich Stimulant System -- 6.4.3 Transition of Three-Component Systems -- 6.4.4 Biological Conclusions -- 6.5 Biological Species -- 6.5.1 Modeling -- 6.5.2 Predator-Prey Systems -- 6.5.3 Three-Species Systems -- Appendix A -- A.1 Formulas for Center Manifold Functions -- A.2 Dynamics of Gradient-Type Systems -- References -- Index.
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  • 3
    Publication Date: 2023-03-14
    Keywords: Acidobacteria; Actinobacteria; Aridity index; aridity indices; brGDGTs; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DS11; DS11_soil; DS21; DS21_soil; DS31; DS31_soil; DS41; DS41_soil; DS51; DS51_soil; DS71; DS71_soil; DS81; DS81_soil; DS91; DS91_soil; Elevation of event; Event label; Inner Mongolia, China; Latitude of event; Longitude of event; MS11; MS11_soil; MS21; MS21_soil; MS31; MS31_soil; MS41; MS41_soil; MS51; MS51_soil; MS61; MS61_soil; MS71; MS71_soil; MS81; MS81_soil; Optional event label; Organic carbon, soil; pH; Precipitation, annual mean; soil pH; SOILS; Soil sample; Temperature, annual mean; TS101; TS101_soil; TS11; TS11_soil; TS111; TS111_soil; TS121; TS121_soil; TS131; TS131_soil; TS141; TS141_soil; TS151; TS151_soil; TS161; TS161_soil; TS21; TS21_soil; TS31; TS31_soil; TS41; TS41_soil; TS51; TS51_soil; TS61; TS61_soil; TS71; TS71_soil; TS81; TS81_soil; TS91; TS91_soil; Vegetation type; Verrucomicrobia
    Type: Dataset
    Format: text/tab-separated-values, 256 data points
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  • 4
    Publication Date: 2023-01-13
    Description: In this dataset, the basic environmental parameters, branched glycerol dialkyl glycerol tetraethers (brGDGTs) and soil bacterial community composition along an aridity soil transect in Inner Mongolia are included. In total, 32 surface soil samples (0-10 cm) were investigated, and the vegetation is characteried as desert steppe, typical steppe, and meadow steppe, repectively. The brGDGTs were extracted uisng a modified Bligh-Dyer method at the Institute of Botany, Chinese Academy of Sciences, and were subquently analyzed on a ultra high performance liquid chromatography mass spectrometer (UHPLC-MS) at Utrecht University. The bacterial DNA was analyzed using the MoBio PowerSoil DNA isolation Kit, and were further processed at the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences.
    Keywords: Acidobacteria; Actinobacteria; aridity indices; brGDGTs; soil pH; Verrucomicrobia
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
    Publication Date: 2023-02-07
    Keywords: Acidobacteria; Actinobacteria; aridity indices; Branched glycerol dialkyl glycerol tetraether; Branched glycerol dialkyl glycerol tetraether, Ia; Branched glycerol dialkyl glycerol tetraether, Ib; Branched glycerol dialkyl glycerol tetraether, Ic; Branched glycerol dialkyl glycerol tetraether, IIa; Branched glycerol dialkyl glycerol tetraether, IIa'; Branched glycerol dialkyl glycerol tetraether, IIb; Branched glycerol dialkyl glycerol tetraether, IIb'; Branched glycerol dialkyl glycerol tetraether, IIc; Branched glycerol dialkyl glycerol tetraether, IIc'; Branched glycerol dialkyl glycerol tetraether, IIIa; Branched glycerol dialkyl glycerol tetraether, IIIa'; Branched glycerol dialkyl glycerol tetraether, IIIb; Branched glycerol dialkyl glycerol tetraether, IIIb'; brGDGTs; Cyclization ratio of branched tetraethers; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DS11; DS11_soil; DS21; DS21_soil; DS31; DS31_soil; DS41; DS41_soil; DS51; DS51_soil; DS71; DS71_soil; DS81; DS81_soil; DS91; DS91_soil; Event label; Inner Mongolia, China; Isomer ratio; Methylation index of branched tetraethers; MS11; MS11_soil; MS21; MS21_soil; MS31; MS31_soil; MS41; MS41_soil; MS51; MS51_soil; MS61; MS61_soil; MS71; MS71_soil; MS81; MS81_soil; Number of cyclopentane moieties of 5-methyl pentamethylated brGDGTs; Number of cyclopentane moieties of 6-methyl pentamethylated brGDGTs; Number of cyclopentane moieties of tetramethylated branched glycerol dialkyl glycerol tetraether; soil pH; SOILS; Soil sample; Temperature, air; TS101; TS101_soil; TS11; TS11_soil; TS111; TS111_soil; TS121; TS121_soil; TS131; TS131_soil; TS141; TS141_soil; TS151; TS151_soil; TS161; TS161_soil; TS21; TS21_soil; TS31; TS31_soil; TS41; TS41_soil; TS51; TS51_soil; TS61; TS61_soil; TS71; TS71_soil; TS81; TS81_soil; TS91; TS91_soil; Ultra high performance liquid chromatography mass spectrometer (UHPLC-MS); Verrucomicrobia
    Type: Dataset
    Format: text/tab-separated-values, 768 data points
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  • 6
    Publication Date: 2023-07-10
    Keywords: Acidobacteria; Actinobacteria; aridity indices; Armatimonadetes; Bacteria, unclassified; Bacteroidetes; brGDGTs; Chloroflexi; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DS11; DS11_soil; DS21; DS21_soil; DS31; DS31_soil; DS41; DS41_soil; DS51; DS51_soil; DS71; DS71_soil; DS81; DS81_soil; DS91; DS91_soil; Elevation of event; Event label; Firmicutes; Gemmatimonadetes; Inner Mongolia, China; Latitude of event; Longitude of event; MS11; MS11_soil; MS21; MS21_soil; MS31; MS31_soil; MS41; MS41_soil; MS51; MS51_soil; MS61; MS61_soil; MS71; MS71_soil; MS81; MS81_soil; Nitrospirae; Optional event label; Planctomycetes; Proteobacteria; soil pH; SOILS; Soil sample; TS101; TS101_soil; TS11; TS11_soil; TS111; TS111_soil; TS121; TS121_soil; TS131; TS131_soil; TS141; TS141_soil; TS151; TS151_soil; TS161; TS161_soil; TS21; TS21_soil; TS31; TS31_soil; TS41; TS41_soil; TS51; TS51_soil; TS61; TS61_soil; TS71; TS71_soil; TS81; TS81_soil; TS91; TS91_soil; Verrucomicrobia
    Type: Dataset
    Format: text/tab-separated-values, 704 data points
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6029-6035 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An observed change in the photoacoustic signal frequency response of laser processed stainless-steel and carbon steel samples with respect to unprocessed reference samples is reported. A recently developed thermal wave theory for depth profiling of bulk inhomogeneities (where the surface thermal diffusivity is known and is the same as the homogeneous reference material) in condensed phases with arbitrary, continuously varying thermal diffusivity profiles [A. Mandelis, S. B. Peralta, and J. Thoen, J. Appl. Phys. 70, 1761 (1991)] has been modified to obtain quantitative thermal diffusivity profiles extending from the surface into the bulk. Profiles obtained using this method, which is, in principle, of nondestructive nature, are consistent with the profiles obtained from destructive methods such as cross-sectional optical metallographic examination and microhardness testing.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Melbourne, Australia : Blackwell Publishing Ltd.
    Nephrology 8 (2003), S. 0 
    ISSN: 1440-1797
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SUMMARY:  Renal replacement therapy is frequently required for critically ill patients with a high risk of bleeding. Conventional heparinization strategies to prevent extracorporeal blood circuit clotting can cause significant haemorrhage in such patients because of systemic anticoagulation. Regional citrate anticoagulation (RCA) is a well-established technique that minimizes this complication by the decalcification of blood in the extracorporeal circuit such that it is incapable of clotting. To date, there are no reports on the use of RCA for sustained low-efficiency dialysis/diafiltration (SLED), a hybrid therapy that involves the use of conventional haemodialysis machinery to deliver lower solute clearances over prolonged periods of time. In preparation for clinical study, an in vitro simulation of SLED was devised (blood substitute flow 250 mL/min, dialysate flow 200 mL/min, predilution haemofiltration 100 mL/min). Blood substitute was decalcified by an infusion of 4% trisodium citrate (TSC) proximally into the extracorporeal blood circuit, with partial restoration of calcium homeostasis from dialysate containing ionized [Ca2+] at 0.9 mmol/L. This simulation was used to establish first the 4% TSC requirement for therapeutic decalcification, and second the associated changes in ionized [Ca2+] and [Mg2+] within the blood substitute from chelation with citrate and subsequent removal of the resulting divalent cation-citrate complex. Serial measurements of blood substitute [Ca2+] from strategic points along the extracorporeal circuit showed therapeutic decalcification was not achieved with 4% TSC infusion rates up to 400 mL/h, and extrapolation of experimental results suggests that 450 mL/h will be required. Under these conditions, ionized [Ca2+] and [Mg2+] in the blood substitute venous return and would be 0.42 and 0.2 mmol/L, respectively, with 0.35 mmol of citrate being returned per minute via the blood substitute venous return. These results were modelled for various changes in SLED operating parameters, and discussed in detail. An appropriate regimen for 4% TSC infusion and divalent cation replacement is proposed for clinical study in the future.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2013-11-29
    Description: Recent development in canopy optical-sensing technology provides the opportunity to apply fertilizer variably at the field scale according to spatial variation in plant growth. A field experiment was conducted in Ottawa, Canada, for two consecutive years to determine the effect of fertilizer nitrogen (N) input at variable- vs. uniform-application strategies at the V6–V8 growth stage, on soil mineral N, canopy reflectance, and grain yield of maize ( Zea mays L.). The variable N rates were calculated using an algorithm derived from readings of average normalized difference vegetation index (NDVI) of about 0.8 m × 4.6 m, and N fertilizer was then applied to individual patches of the same size of NDVI readings (0.8 m × 4.6 m) within a plot (2184 m 2 ). Canopy reflectance, expressed as NDVI, was monitored with a hand-held spectrometer, twice weekly before tasseling and once a week thereafter until physiological maturity. Soil mineral N (0–30 cm depth) was analyzed at the V6 and VT growth stages. Our data show that both variable and uniform-application strategies for N side-dressings based on canopy-reflectance mapping data required less amount of N fertilizer (with an average rate of 80 kg N ha –1 as side-dressing in addition to 30 kg N ha –1 applied at planting), and produced grain yields similar to and higher nitrogen-use efficiency (NUE) than the preplant fully fertilized (180 kg N ha –1 ) treatment. No difference was observed in either grain yield or NUE between the variable- and uniform-application strategies. Compared to unfertilized or fully fertilized treatments, the enhancements in grain yield and NUE of the variable-rate strategy originated from the later N input as side-dressing rather than the variation in N rates. The variable-rate strategy resulted in less spatial variations in soil mineral N at the VT growth stage and greater spatial variations in grain yield at harvest than the uniform-rate strategy. Both variable- and uniform-application strategies reduced spatial variations in soil mineral N at the VT stage and grain yield compared to the unfertilized treatment. The variable-rate strategy resulted in more sampling points with high soil mineral N than the uniform-rate strategy at the VT stage.
    Print ISSN: 1436-8730
    Electronic ISSN: 1522-2624
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley-Blackwell
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  • 10
    Publication Date: 2013-09-19
    Description: For the HLS-II bunch current measurement system, in order to obtain the absolute value of bunch current, the calibration factor should be determined by using DCCT. At the HLS storage ring, the stretch effect of bunch length is observed and the change rate is about 19% when the bunch current decays over time and this will affect the performance of bunch current detection. To overcome the bunch stretch influence in the HLS- II bunch current measurement, an evaluation about pickup type and signal processing is carried out. Strip-line pickup and button pickup are selectable, and the theoretical analysis and demonstration experiment are performed to find out an acceptable solution for the bunch current measurement system at HLS- II. The experimental data analysis shows that the normalized calibration factor will change by about 27% when the bunch length changes by about 19% if using the button pickup and processing by peak value of bunch signal; the influence will be reduced to 2% le...
    Print ISSN: 1674-1137
    Topics: Physics
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