Scientific Commons: F. Ludwig

Impacts of Recent Climate change on wheat production systems in Western Australia (2009)

The wheatbelt of Western Australia shows a distinct Mediterranean climate with most of the rainfall occurring in the winter months. The main factor limiting plant production in this region is...

Description of the WATCH Modelling Framework (2009)

Ludwig, F., Voss, F.

Temporal Profiles of the Coherent Transition Radiation Measured at FLASH with Electro-Optical Spectral Decoding 2009-05-25 - 2009-05-27 (2009)

V.R. Arsov, M.K. Bock, M. Felber, P. Gessler, ...

Contribution to a conf. proceeding (book/online)

Climate Change Adaptation in the Water Sector (2009)

Ludwig, F., Kabat, P.

Crop physiology, modelling and climate change: Impact and adaptation strategies (2009)

Asseng, S., Cao, W., Zhang, W., Ludwig, F.

Introduction (2009)

Ludwig, F., Kabat, P., Droogers, P.

The Impacts of Climate Change on Water (2009)

Ludwig, F., Moench, M.

Using Seasonal Climate Forecasts for Water Management (2009)

Ludwig, F.

Phenotypic selection on leaf ecophysiological traits in Helianthus (2009)

Donovan, L.A., Ludwig, F., Rosenthal, D.R., Rieseberg, L.H., Dudley, S.A.

Habitats that differ in soil resource availability are expected to differ for selection on resource-related plant traits. Here, we examined spatial and temporal variation in phenotypic selection on...

Impacts of climate variability and change on development and water security in Sub-Saharan Africa (2009)

Ludwig, F., Kabat, P., Hagemann, S., Dorlandt, M.

Observation of 40 fs Synchronization of Electron Bunches for FELs. 2008-08-24 - 2008-08-29 (2009)

F. Löhl, V. Arsov, C. Behrens, M. Felber, ...

Contribution to a conf. proceeding (book/online)

Drift-Free, Cost-Effective Detection Prinziple to Measure the Timing Overlap Between Two Optical Pulse Trains. 2008-08-24 - 2008-08-29 (2009)

J. Zemella, V. Arsov, M. Felber, K.E. Hacker, ...

Contribution to a conf. proceeding (book/online)

Improved quality of beneath-canopy grass in South African savannas: Local and seasonal variation (2008)

Anna C. Treydte, F. Ludwig

Questions: Do large trees improve the nutrient content and the structure of the grass layer in savannas? Does the magnitude of this improvement differ with locality (soil nutrients) and season (water...

Impacts of savanna trees on forage quality for a large African herbivore (2008)

Ludwig, F., Prins, H.H.T.

Electro-optic Bunch Arrival Time Measurement at FLASH 2008-06-23 - 2008-06-27 (2008)

V. Arsov, M. Felber, F. Löhl, ...

Contribution to a conf. proceeding (book/online)

Experimental Determination of the Timing Stability of the Optical Synchronization System at FLASH 2008-06-23 - 2008-06-27 (2008)

F. Löhl, V. Arsov, M. Felber, K. Hacker, ...

Contribution to a conf. proceeding (book/online)

An Optical Cross-correlation Scheme to Synchronize Distributed Laser Systems at FLASH 2008-06-23 - 2008-06-27 (2008)

S. Schulz, V. Arsov, M. Felber, F. Löhl, ...

Contribution to a conf. proceeding (book/online)

Measurement and Stabilization of the Bunch Arrival Time at FLASH 2008-06-23 - 2008-06-27 (2008)

F. Löhl, V. Arsov, M. Felber, K. Hacker, ...

Contribution to a conf. proceeding (book/online)

Improved quality of beneath-canopy grass in South African savannas: Local and seasonal variation (2008)

Treydte, A.C., Looringh Van Beeck, F.A., Ludwig, F., Heitkonig, I.M.A.

Modelling ungulate dependence on higher quality forage under large trees in African savannahs (2008)

Treydte, A.C., Heitkönig, I.M.A., Ludwig, F.

In African savannahs, large trees improve grass quality, particularly in dry and nutrient poor areas. Enhanced below-canopy grass nutrients, such as nitrogen and phosphorus contents should therefore...

Climate change - threats or opportunities for agriculture? (2008)

Asseng, S., Ludwig, F., Milroy, S., Travasso, M.

Definition of socioeconomic scenarios for land surface hydrology simulations of the 21st century (2008)

Gerten, D., Haddeland, I., Hagemann, S., Ludwig, F., Wiberg, D.

Impacts of climate change on water resource management in Egypt and The Netherlands (2008)

Ludwig, F., Vellinga, P.

Preliminary Water Assessment Reports of The Test Basins of The Watch Project (2008)

Ludwig, F., Candel, M., Carrera, J., Fendekova, M., Haddeland, I., Horacek, S, ...

The potential value of seasonal forecasts of rainfall categories¿Case studies from the wheatbelt in Western Australia's Mediterranean region (2008)

Moeller, C., Smith, I., Asseng, S., Ludwig, F., Telcik, N.

Hypothetical forecasts of categories of seasonal rainfall (May¿October) were evaluated in order to identify which requirements for seasonal climate forecasting are most useful in guiding decisions...

High-Performance High-Tc SQUID Sensors for Multichannel Systems in Magnetically Disturbed Environment (2007)

F. Ludwig, J. Beyer, D. Drung, S. Bechstein, Th. Schurig

Abstract⎯We have fabricated and characterized high-Tc SQUID sensors that are suited for operation in multichannel systems in magnetically disturbed environment. Utilizing the superior properties of...

Trees improve grass quality for herbivores in African savannas (2007)

Treydte, A.C., Heitkonig, I.M.A., Prins, H.H.T., Ludwig, F.

The tree-grass interactions of African savannas are mainly determined by varying rainfall patterns and soil fertility. Large savanna trees are known to modify soil nutrient conditions, but whether...

Multichannel Downconverter for the Next Generation RF Field Control for VUV- and X-Ray Free. 2007-06-25 - 2007-06-29 (2007)

M. Hoffmann, DESY Maschinenphysik, F. Ludwig, H. Schlarb, S. Simrock

Contribution to a conf. proceeding (book/online)

Long-Term Stable Microwave Signal Extraction from Mode-Locked Lasers 2007-05-06 - 2007-05-11 (2007)

J. Kim, DESY Maschinenphysik, M. Felber, F. Ludwig, H. Schlarb, ...

Contribution to a conf. proceeding (book/online)

Noise and Drift Characterization of Direct Laser to RF Conversion Scheme for the Laser Based Synchronization System for FLASH at DESY. 2007-06-25 - 2007-06-29 (2007)

B. Lorbeer, F. Ludwig, H. Schlarb, A. Winter

Contribution to a conf. proceeding (book/online)

Large-Scale, Long-Term Stable Femtosecond Timing Distribution and Synchronization Systems. 2007-07-23 - 2007-07-25 (2007)

J. Kim, J. Chen, F.X. Kärtner, F. Löhl, ...

Contribution to a conf. proceeding (book/online)

Impacts of climate change and variability on development and water security (2007)

Ludwig, F.

Long-term effects of elevated atmospheric CO2 exhalation on species composition and productivity of a southern African C4 dominated grassland in the vicinity of a CO2 exhalation (2007)

Stock, W.D., Ludwig, F., Morrow, C., Midgley, G.F., Wand, S.J.E., Allsopp, N., ...

We describe the long-term effects of a CO2 exhalation, created more than 70 years ago, on a natural C4 dominated sub-tropical grassland in terms of ecosystem structure and functioning. We tested...

Phenotypic selection on leaf WUE and related ecophysiological traits for natural populations of desert sunflowers (2007)

Donovan, L.A., Rosenthal, D.R., Dudley, S.A., Ludwig, F.

Plant water-use efficiency (WUE) is expected to affect plant fitness and thus be under natural selection in arid habitats. Although many natural population studies have assessed plant WUE, only a few...

Climate change impacts on Developing Countries - EU Accountability (2007)

Ludwig, F., Verhagen, J., Kruijt, B., Dellink, R.B., ...

Does a grazer need trees? The attractiveness of below-crown grasses in African savannas (2007)

Treydte, A.C., Looringh Van Beeck, F.A., Heitkonig, I.M.A., Prins, H.H.T., Ludwig, F.

Do trees really matter? Insights into sub-canopy grass quality in African savannas (2007)

Treydte, A.C., Heitkonig, I.M.A., Prins, H.H.T., Ludwig, F.

Is a tree to be? Large trees enhancing sub-canopy grass quality in African savannas (2007)

Treydte, A.C., Looringh Van Beeck, F.A., Heitkonig, I.M.A., Prins, H.H.T., Ludwig, F.

Fermi Timing and Synchronization System (2006)

Wilcox, R., Staples, J., Doolittle, L., Byrd, J., Ratti, A., Kaertner, F.X., ...

Nutrient and water addition effects on day- and night-time conductance and transpiration in a C3 desert annual (2006)

Ludwig, F., Jewitt, R.A., Donovan, L.A.

Recent research has shown that many C3 plant species have significant stomatal opening and transpire water at night even in desert habitats. Day-time stomatal regulation is expected to maximize...

A Sub 100 fs Electron Bunch Arrival-time Monitor System for FLASH 2006-06-26 - 2006-06-30 (2006)

F. Löhl, K.E. Hacker, F. Ludwig, H. Schlarb, ...

Contribution to a conf. proceeding (book/online)

An Integrated Femtosecond Timing Distribution System for XFELs 2006-06-26 - 2006-06-30 (2006)

J. Burnham, J. Chen, F.X. Kärtner, ...

Contribution to a conf. proceeding (book/online)

High-Precision Laser Master Oscillators for Optical Timing Distribution Systems in Future Light Sources 2006-06-26 - 2006-06-30 (2006)

A. Winter, J. Chen, F.Ö. Ilday, F.X. Kärtner, ...

Contribution to a conf. proceeding (book/online)

An Integrated Femtosecond Timing Distribution System for XFELs 2006-06-26 - 2006-06-30 (2006)

J. Burnham, J. Chen, F.X. Kärtner, ...

Contribution to a conf. proceeding (book/online)

High-Precision Laser Master Oscillators for Optical Timing Distribution Systems in Future Light Sources 2006-06-26 - 2006-06-30 (2006)

A. Winter, J. Chen, F.Ö. Ilday, F.X. Kärtner, ...

Contribution to a conf. proceeding (book/online)

Precision RF Gun Phase Monitor System for the VUV-FEL 2006-06-26 - 2006-06-30 (2006)

H. Schlarb, N. Heidbrook, H. Kapitza, F. Ludwig, ...

Contribution to a conf. proceeding (book/online)

Layout of the Optical Synchronization System for FLASH 2006-06-26 - 2006-06-30 (2006)

A. Winter, F. Löhl, F. Ludwig, H. Schlarb, ...

Contribution to a conf. proceeding (book/online)

High-Precision Laser Master Oscillators for Optical Timing Distribution Systems in Future Light Sources 2006-06-26 - 2006-06-30 (2006)

A. Winter, J. Chen, F.Ö. Ilday, F.X. Kärtner, ...

Contribution to a conf. proceeding (book/online)

Climate change impacts on wheat production in a Mediterranean environment in Western Australia (2006)

Ludwig, F., Asseng, S.

The environment in which crops will be grown in the future will change. CO2 concentrations [CO2] and temperatures (T) will probably increase and a decline of winter rainfall is predicted for...

Are trees important for grazing wildlife? Large trees improving grass quality in African savanna (2006)

Treydte, A.C., Heitkonig, I.M.A., Ludwig, F.

Determinants of woody cover in African savannas (2005)

Sankaran, M, Hanan, NP, Scholes, RJ, Ratnam, J, Augustine, DJ, Cade, BS, ...

Savannas are globally important ecosystems of great significance to human economies. In these biomes, which are characterized by the co-dominance of trees and grasses, woody cover is a chief...

Determinants of woody cover in African savannas (2005)

Sankaran, M, Hanan, NP, Scholes, RJ, Ratnam, J, Augustine, DJ, Cade, BS, ...

Savannas are globally important ecosystems of great significance to human economies. In these biomes, which are characterized by the co-dominance of trees and grasses, woody cover is a chief...

Determinants of woody cover in African savannas (2005)

Sankaran, M., Hanan, N.P., Scholes, R.J., Ratnam, J., Augustine, D.J., Cade, B.S., ...

Savannas are globally important ecosystems of great significance to human economies. In these biomes, which are characterized by the co-dominance of trees and grasses, woody cover is a chief...

GRB 050714, optical observations (2005)

Klose, S., Stecklum, B., Fuhrmann, B., Ludwig, F., Greiner, J.

Long-term effects of elevated atmospheric CO2 on species composition and productivity of a southern African C4 dominated grassland in the vicinity of a CO2 exhalation. (2005)

Stock, W.D., Ludwig, F., Morrow, C., Midgley, G.F., Wand, S.J.E., Allsopp, N., ...

We describe the long-term effects of a CO2 exhalation, created more than 70 years ago, on a natural C4 dominated sub-tropical grassland in terms of ecosystem structure and functioning. We tested...

Plant responses to an edaphic gradient across an active sand dune/desert boundary in the great basin desert. (2005)

Rosenthal, D.M., Ludwig, F., Donovan, L.A.

In arid ecosystems, variation in precipitation causes broad-scale spatial heterogeneity in soil moisture, but differences in soil texture, development, and plant cover can also create substantial...

Plant responses to spatial environmental heterogenity across a sharp resource availability gradient in the Great Basin Destert (2005)

Rosenthal, D.R., Ludwig, F., Donovan, L.A.

The influence of savanna trees on nutrient, water and light availability and the understorey vegetation (2004)

Ludwig, F., Berendse, F., Prins, H.H.T.

In an East African savanna herbaceous layer productivity and species composition were studied around Acacia tortilis trees of three different age classes, as well as around dead trees and in open...

Below-ground competition between trees and grasses may overwhelm the facilitative effects of hydraulic lift (2004)

Ludwig, F., Prins, H.H.T., Berendse, F., Dawson, T.E.

Selection on leaf ecophysiological traits in a hybrid Helianthus species and early generation hybrids in a desert dune habitat (2004)

Ludwig, F., Rosenthal, D.R., Johnston, J.A., Ryan, N., Gross, B.L., Lexer, C., ...

Leaf ecophysiological traits related to carbon gain and resource use are expected to be under strong selection in desert annuals. We used comparative and phenotypic selection approaches to...

Reconstructing the origin of Helianthus deserticola: Survival and selection on the desert floor (2004)

Gross, B.L., Kane, D.L., Lexer, C., Ludwig, F., Rosenthal, D.R., Donovan, L.A., ...

Nonlinear dynamics and far-infrared broadband spectroscopy of $YBa-2_Cu-3_O-7$ Josephson junctions for the TESLA Test Facility linac (2003)

Ludwig, F

Hydraulic lift in Acacia tortilis trees on an East African savanna (2003)

Ludwig, F., Dawson, T.E., Berendse, F., Prins, H.H.T.

Tree-grass interactions on an East African savanna : the effects of competition, facilitation and hydraulic lift (2001)

Ludwig, F.

http://library.wur.nl/wda/abstracts/ab3101.html

Tree-grass interactions on an East African Savanna (2001)

Ludwig, F.

http://library.wur.nl/wda/abstracts/ab3101.html

Effects of nutrients and shade on tree-grass interactions in an East African savanna. (2001)

Ludwig, F., Prins, H.H.T., Berendse, F.

Savanna trees have a multitude of positive and negative effects on understorey grass production, but little is known about how these effects interact. We report on a fertilization and shading...

Optimization of Direct-Coupled High-Tc SQUID Magnetometers for Operation in Magnetically Unshielded Environment (2001)

Ludwig, F., Jansman, A.B.M., Drung, D., Lindstrom, M.O., Bechstein, S., Beyer, J., ...

Cyclotron resonance of the quasi-two-dimensional electron gas at Hg1-xCdxTe grain boundaries (1992)

Ludwig, F., Nachtwei, G., Watts, M., Bassom, N. J., Kraak, W., ...

The magnetotransmission of a p-type Hg0.766Cd0.234Te bicrystal containing a single grain boundary with an inversion layer has been investigated in the submillimetre wavelength range. For the first...

VARIATIONSSTATISTISCHE PROBLEME UND MATERIAlIEN (1901)

LUDWIG, F.

Femtosecond Optical Synchronization Systems for XFELs. 2006-03-28 - 2006-03-31

A. Winter, F.Ö. Ilday, J. Chen, F. Ludwig, ...

Conference presentation

Compact Ultra-High Precision Beam Phase Monitor System 2006-05-15 - 2006-05-19

F. Löhl, K.E. Hacker, F. Ludwig, H. Schlarb, ...

Conference presentation

Synchronization System for the XFEL 2006-05-15 - 2006-05-19

H. Schlarb, F.X. Kärtner, J. Kim, F. Löhl, ...

Conference presentation

Noise and Drift Characterization of Critical Components for the Laser Based Synchronization System at FLASH. 2007-05-20 - 2007-05-23