Search results for: R. Welter

Items from 1 to 20 out of 52 results

article

The influence of storm characteristics on hydrological connectivity in intermittent channel networks: implications for nitrogen transport and denitrification

Jill R. Welter, Stuart G. Fisher

Freshwater Biology > 61 > 8 > 1214 - 1227

Intermittent channel networks pose particular challenges for monitoring the extent of material transport and retention in arid river basins as a result of pulsed and highly variable rainfall‐runoff dynamics. Here, we examine how rainfall characteristics influence hydrological connectivity along a terrestrial–aquatic flowpath from upland hillslopes to low order intermittent channel networks. In...

article

In reply to Brillhart et al.

Chris R. Welter, J. Matthew Sholl, Tania D. Strout, Ben Woodard

Wilderness & Environmental Medicine > 2016 > 27 > 2 > 345-346

article

Warming alters coupled carbon and nutrient cycles in experimental streams

Tanner J. Williamson, Wyatt F. Cross, Jonathan P. Benstead, Gísli M. Gíslason, more

Global Change Biology > 22 > 6 > 2152 - 2164

Although much effort has been devoted to quantifying how warming alters carbon cycling across diverse ecosystems, less is known about how these changes are linked to the cycling of bioavailable nitrogen and phosphorus. In freshwater ecosystems, benthic biofilms (i.e. thin films of algae, bacteria, fungi, and detrital matter) act as biogeochemical hotspots by controlling important fluxes of energy...

chapter

Flowpaths as Integrators of Heterogeneity in Streams and Landscapes

Stuart G. Fisher, Jill R. Welter

Ecosystem Function in Heterogeneous Landscapes > Illustrations of Heterogeneity and Ecosystem Function > 311-328

Streams are heterogeneous in both space and time. Hydrologic flowpaths along which biogeochemical processing occurs integrate different patches of the stream. Disturbance events (flood and drying) change these patches, alter connectivity, and reinforce spatial heterogeneity. Heterogeneity within patches (surface stream, hyporheic zone, sand bars, and riparian zone) is generated by the interaction...

article

Epidemiology of Search and Rescue in Baxter State Park: Dangers of Descent and Fatigue

Chris R. Welter, J. Matthew Sholl, Tania D. Strout, Ben Woodard

Wilderness & Environmental Medicine > 2015 > 26 > 4 > 549-554

The purpose of this study was to determine the epidemiology of injury in Baxter State Park, Maine, and to better tailor search and rescue (SAR) resources, personnel, and training to acute needs in the park.We conducted a retrospective review of all SAR incident reports in Baxter State Park from July 1992 through June 2014. For each event, demographics, location, time, activity before the incident,...

article

The stoichiometry of nitrogen and phosphorus spiralling in heterotrophic and autotrophic streams

JOHN D. SCHADE, KEELEY MacNEILL, STEVE A. THOMAS, F. CAMILLE McNEELY, more

Freshwater Biology > 56 > 3 > 424 - 436

1. Nutrient spiralling provides a conceptual framework and a whole‐system approach to investigate ecosystem responses to environmental changes. We use spiralling metrics to examine how the coupling of nitrogen and phosphorus uptake varies between streams dominated by either heterotrophic (i.e. bacteria‐dominated) or autotrophic (algal‐dominated) microbial communities. 2. Algae generally exhibit greater...

article

Dioxapyrene-Based Organic Semiconductors for Organic Field Effect Transistors

Deepak Shukla, Thomas R. Welter, Douglas R. Robello, David J. Giesen, more

The Journal of Physical Chemistry C > 2009 > 113 > 32 > 14482 - 14486

article

Synthesis and Crystal Structure of La(NO₂)(SO₄)(H₂O)

M. Diallo, M. Diop, P. M. Haba, M. Gaye, more

Journal of Chemical Crystallography > 2008 > 38 > 6 > 475-478

Single crystals of new open-framework lanthanide sulphate nitrite La(NO₂)(SO₄)(H₂O) has been synthesized, in the presence of 2,6-diformyl-4-chlorophenol. His structure has been determined by X-ray diffraction data: the complex crystallizes in the tetragonal system, space group P4₃, with a = 7.0028(2) (Å), b = 7.0028(2) (Å), c = 11.8341(4) Å, V = 580.34(3) Å³, Z = 4, D _c = 3.582 Mg m⁻³. The three-dimensional...

article

Functional ecomorphology: Feedbacks between form and function in fluvial landscape ecosystems

Stuart G. Fisher, James B. Heffernan, Ryan A. Sponseller, Jill R. Welter

Geomorphology > 2007 > 89 > 1-2 > 84-96

The relationship between form and function has been a central organizing principle in biology throughout its history as a formal science. This concept has been relevant from molecules to organisms but loses meaning at population and community levels where study targets are abstract collectives and assemblages. Ecosystems include organisms and abiotic factors but ecosystem ecology too has developed...

article

Magnetic structure of the Sc2Re3Si4-type Tb2Ti3Si4 compound

A.V. Morozkin, R. Welter, B. Malaman

Journal of Alloys and Compounds > 2006 > 417 > 1-2 > L9-L10

Investigations were made by neutron diffraction on the Sc ₂ Re ₃ Si ₄ -type (space group P4 ₁ 2 ₁ 2 No. 92) Tb ₂ Ti ₃ Si ₄ compound. The Tb ₂ Ti ₃ Si ₄ compound shows a ferromagnetic type ordering below 9K. At 2K, the magnetic structure of this compound consists of Tb ferromagnetic (110) layers with the Tb magnetic...

article

Magnetic structure of the ZrNiAl-type Dy3Mn3SiGa2 compound

A.V. Morozkin, R. Welter, T.I. Ivanova, M.V. Makarova, more

Journal of Alloys and Compounds > 2006 > 415 > 1-2 > 23-25

A neutron diffraction study of Dy ₃ Mn ₃ SiGa ₂ (ZrNiAl structure; space group P6b2m, No. 189) is reported. The Dy ₃ Mn ₃ SiGa ₂ becomes antiferromagnetic at temperature T _N =56(5)K, ordering with the wave vector [1/2, 0, 0]. We found an unusual magnetic structure: while the Mn magnetic moments order in a collinear magnetic structure, the Dy...

article

New manganese complexes with 2-salicyloylhydrazono-1,3-dithiolane ligand and various coordination solvents

C. Beghidja, M. Wesolek, R. Welter

Inorganica Chimica Acta > 2005 > 358 > 13 > 3881-3888

The new Mn(HL)2L2′ complexes with 2-salicyloylhydrazono-1,3-dithiolane ligand (H ₂ L) have been obtained with good yields (≈85%) by reacting manganese (II) acetate tetrahydrate or manganese (II) acetylacetonate with 2-salicyloylhydrazono-1,3-dithiolane ligand in DMF, THF or Py (L′). These compounds have been fully characterized by spectroscopic methods and single crystal X-ray diffraction...

article

Magnetic structures of the CeScSi-type RZrSb compounds (R=Tb, Er)

A.V. Morozkin, K. Halich, R. Welter, B. Ouladdiaf

Journal of Alloys and Compounds > 2005 > 393 > 1-2 > 34-40

Investigations made by neutron diffraction experiments on the RZrSb compounds (R=Tb, Dy, Ho and Er) are reported. These compounds crystallize in the tetragonal CeScSi-type structure (space group I4/mmm, No. 139). Below T _C (65 and 45K for the Tb and DyZrSb compounds, respectively), the magnetic structure of both TbZrSb and DyZrSb compounds consists of ferromagnetic (001) layers staked along...

article

Magnetic structure of CeScSi-type TbxEr1−xTi0.85Mo0.15Ge compounds (x=0, …, 1)

A.V. Morozkin, R. Nirmala, K. Halich, S.K. Malik, more

Journal of Alloys and Compounds > 2005 > 392 > 1-2 > 1-5

Magnetization and neutron diffraction studies have been carried out on CeScSi-type Tb _x Er _1−x Ti _0.85 Mo _0.15 Ge compounds (space group I4/mmm, no. 139). These compounds demonstrate ferromagnetic collinear 1 (FC1), ferromagnetic collinear 2 (FC2) and ferromagnetic non-collinear 1 (FNC1) types of ordering. Below T _FC1 =131K for Tb _0.25 Er _0.75 ...

article

Nitrogen Transport and Retention in an Arid Land Watershed: Influence of Storm Characteristics on Terrestrial–aquatic Linkages

Jill R. Welter, Stuart G. Fisher, Nancy B. Grimm

Biogeochemistry > 2005 > 76 > 3 > 421-440

Arid ecosystems experience prolonged dry periods, as well as storms that vary in size, intensity and frequency. As a result, nitrogen (N) retention and export patterns may be a function of individual storm characteristics. Our objective was to determine how seasonal patterns in rainfall as well as individual storm characteristics influence N transport and retention on terrestrial hill slopes in a...

article

Neutron diffraction study of the PrRu ₁ _- _x Fe _x Si and NdRu ₁ _- _x Fe _x Si solid solutions. - First example of canted ferromagnetic structure in the CeFeSi-type compounds

R. Welter, K. Halich, B. Malaman

Inorganica Chimica Acta > 2003 > 350 > Complete > 428 - 434

We report on powder neutron diffraction studies of both solid solutions PrRu ₁ _- _x Fe _x Si and NdRu ₁ _- _x Fe _x Si, which adopt the CeFeSi-type structure. All studied compounds order antiferromagnetically with a collinear antiferromagnetic structure which consists of ferromagnetic (001) R layers (with moments perpendicular to the layers, except for NdRu...

article

Magnetic behaviour of the Mn sublattice in ThCr ₂ Si ₂ -type CaMn ₂ _- _x Fe _x Ge ₂ solid solution investigated by magnetic measurements and neutron diffraction

R. Welter, B. Malaman

Journal of Alloys and Compounds > 2003 > 354 > 1-2 > 35-46

The CaMn ₂ _- _x Fe _x Ge ₂ (ThCr ₂ Si ₂ -type structure) solid solution was studied by means of X-ray powder diffraction, magnetic measurements and neutron diffraction experiments. The magnetic structures of the CaMn ₁ _. ₃ Fe ₀ _. ₇ Ge ₂ , CaMnFeGe ₂ and CaMn ₀ _. ₈ Fe ₁ _. ₂ ...

article

Magnetic study of the ThCr ₂ Si ₂ -type RIr ₂ Si ₂ (R=Pr,Nd) compounds: Magnetic structure of NdIr ₂ Si ₂ from powder neutron diffraction

R. Welter, K. Halich, B. Malaman

Journal of Alloys and Compounds > 2003 > 353 > 1-2 > 48-52

We report on synthesis and magnetic characterization of the tetragonal ThCr ₂ Si ₂ -type PrIr ₂ Si ₂ and NdIr ₂ Si ₂ compounds. The PrIr ₂ Si ₂ compound, not yet signaled, orders antiferromagnetically below T _N =47(1) K. The NdIr ₂ Si ₂ compound orders antiferromagnetically below T _N =33(1) K. The magnetic...

article

A magnetic study of the CeScSi-type RZrSb compounds (R=Gd-Tm). Large coercive field at low temperature in TbZrSb and DyZrSb

R. Welter, A.V. Morozkin, K. Halich

Journal of Magnetism and Magnetic Materials > 2003 > 257 > 1 > 44-50

X-ray single crystal refinement performed on the GdZrSb and HoZrSb compounds confirms the CeScSi-type structure for the RZrSb series. Spontaneous magnetization is detected for all the studied compounds (5K (TmZrSb)<T _C <61K (TbZrSb)). Both TbZrSb and DyZrSb compounds exhibit a second magnetic transition at low temperature (29 and 21K, respectively). Large coercive field is measured for...

article

New Sc ₂ Re ₃ Si ₄ -type R ₂ Ti ₃ Si ₄ compounds and their magnetic properties (R=Gd-Er)

A.V. Morozkin, R. Welter

Journal of Alloys and Compounds > 2003 > 348 > 1-2 > L1-L3

Powder X-ray diffraction investigations and macroscopic magnetic properties of new ternary Sc ₂ Re ₃ Si ₄ -type R ₂ Ti ₃ Si ₄ compounds (R=Gd-Er) are reported. The compounds (Gd ₀ _. ₉ ₅ ) ₂ Ti ₃ Si ₄ (a=0.6997(2) nm, c=1.2878(4) nm), Tb ₂ Ti ₃ Si ₄ (a=0.7006(1) nm, c=1.2875(2) nm), Dy...

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INFONA - science communication portal

Search results for: R. Welter

The influence of storm characteristics on hydrological connectivity in intermittent channel networks: implications for nitrogen transport and denitrification

In reply to Brillhart et al.

Warming alters coupled carbon and nutrient cycles in experimental streams

Flowpaths as Integrators of Heterogeneity in Streams and Landscapes

Epidemiology of Search and Rescue in Baxter State Park: Dangers of Descent and Fatigue

The stoichiometry of nitrogen and phosphorus spiralling in heterotrophic and autotrophic streams

Dioxapyrene-Based Organic Semiconductors for Organic Field Effect Transistors

Synthesis and Crystal Structure of La(NO₂)(SO₄)(H₂O)

Functional ecomorphology: Feedbacks between form and function in fluvial landscape ecosystems

Magnetic structure of the Sc2Re3Si4-type Tb2Ti3Si4 compound

Magnetic structure of the ZrNiAl-type Dy3Mn3SiGa2 compound

New manganese complexes with 2-salicyloylhydrazono-1,3-dithiolane ligand and various coordination solvents

Magnetic structures of the CeScSi-type RZrSb compounds (R=Tb, Er)

Magnetic structure of CeScSi-type TbxEr1−xTi0.85Mo0.15Ge compounds (x=0, …, 1)

Nitrogen Transport and Retention in an Arid Land Watershed: Influence of Storm Characteristics on Terrestrial–aquatic Linkages

Neutron diffraction study of the PrRu ₁ _- _x Fe _x Si and NdRu ₁ _- _x Fe _x Si solid solutions. - First example of canted ferromagnetic structure in the CeFeSi-type compounds

Magnetic behaviour of the Mn sublattice in ThCr ₂ Si ₂ -type CaMn ₂ _- _x Fe _x Ge ₂ solid solution investigated by magnetic measurements and neutron diffraction

Magnetic study of the ThCr ₂ Si ₂ -type RIr ₂ Si ₂ (R=Pr,Nd) compounds: Magnetic structure of NdIr ₂ Si ₂ from powder neutron diffraction

A magnetic study of the CeScSi-type RZrSb compounds (R=Gd-Tm). Large coercive field at low temperature in TbZrSb and DyZrSb

New Sc ₂ Re ₃ Si ₄ -type R ₂ Ti ₃ Si ₄ compounds and their magnetic properties (R=Gd-Er)

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