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Showing 1 to 12 of 265 entries
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Snow processes in mountain forests: interception modeling for coarse-scale applications

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Helbig N, Teich M.
GSID: FRndDvDbapcJ
N Helbig, D Moeser, M Teich, L Vincent… - Hydrology and Earth …, 2020 - hess.copernicus.org

Snow interception by the forest canopy controls the spatial heterogeneity of subcanopy snow accumulation leading to significant differences between forested and nonforested areas at a variety of scales. Snow intercepted by the forest canopy can also drastically change the...

Efficient laser-driven proton acceleration from cylindrical and planar cryogenic hydrogen jets.

Scientific reports

Obst L, Göde S, Rehwald M, Brack FE, Branco J, Bock S, Bussmann M, Cowan TE, Curry CB, Fiuza F, Gauthier M, Gebhardt R, Helbig U, Huebl A, Hübner U, Irman A, Kazak L, Kim JB, Kluge T, Kraft S, Loeser M, Metzkes J, Mishra R, Rödel C, Schlenvoigt HP, Siebold M, Tiggesbäumker J, Wolter S, Ziegler T, Schramm U, Glenzer SH, Zeil K.
PMID: 28860614
Sci Rep. 2017 Aug 31;7(1):10248. doi: 10.1038/s41598-017-10589-3.

We report on recent experimental results deploying a continuous cryogenic hydrogen jet as a debris-free, renewable laser-driven source of pure proton beams generated at the 150 TW ultrashort pulse laser Draco. Efficient proton acceleration reaching cut-off energies of up...

Demonstration of a beam loaded nanocoulomb-class laser wakefield accelerator.

Nature communications

Couperus JP, Pausch R, Köhler A, Zarini O, Krämer JM, Garten M, Huebl A, Gebhardt R, Helbig U, Bock S, Zeil K, Debus A, Bussmann M, Schramm U, Irman A.
PMID: 28887456
Nat Commun. 2017 Sep 08;8(1):487. doi: 10.1038/s41467-017-00592-7.

Laser-plasma wakefield accelerators have seen tremendous progress, now capable of producing quasi-monoenergetic electron beams in the GeV energy range with few-femtoseconds bunch duration. Scaling these accelerators to the nanocoulomb range would yield hundreds of kiloamperes peak current and stimulate...

Conditions for Describing Triplet States in Reduced Density Matrix Functional Theory.

Journal of chemical theory and computation

Theophilou I, Lathiotakis NN, Helbig N.
PMID: 27171683
J Chem Theory Comput. 2016 Jun 14;12(6):2668-78. doi: 10.1021/acs.jctc.6b00257. Epub 2016 May 26.

We consider necessary conditions for the one-body reduced density matrix (1RDM) to correspond to a triplet wave function of a two-electron system. The conditions concern the occupation numbers and are different for the high spin projections, Sz = ±1,...

Ciliopathies - from rare inherited cystic kidney diseases to basic cellular function.

Molecular and cellular pediatrics

Habbig S, Liebau MC.
PMID: 26542298
Mol Cell Pediatr. 2015 Dec;2(1):8. doi: 10.1186/s40348-015-0019-1. Epub 2015 May 19.

BACKGROUND: Primary cilia are membrane-bound microtubule-based protuberances of the cell membrane projecting to the extracellular environment. While little attention was paid to this subcellular structure over a long time, recent research has highlighted multiple cellular functions of primary cilia...

Targeted sequencing of 351 candidate genes for epileptic encephalopathy in a large cohort of patients.

Molecular genetics & genomic medicine

de Kovel CG, Brilstra EH, van Kempen MJ, Van't Slot R, Nijman IJ, Afawi Z, De Jonghe P, Djémié T, Guerrini R, Hardies K, Helbig I, Hendrickx R, Kanaan M, Kramer U, Lehesjoki AE, Lemke JR, Marini C, Mei D, Møller RS, Pendziwiat M, Stamberger H, Suls A, Weckhuysen S, Koeleman BP.
PMID: 27652284
Mol Genet Genomic Med. 2016 Jul 30;4(5):568-80. doi: 10.1002/mgg3.235. eCollection 2016 Sep.

BACKGROUND: Many genes are candidates for involvement in epileptic encephalopathy (EE) because one or a few possibly pathogenic variants have been found in patients, but insufficient genetic or functional evidence exists for a definite annotation.METHODS: To increase the number...

[The distribution of proteins in field and house cricket eggs].

Wilhelm Roux' Archiv fur Entwicklungsmechanik der Organismen

Koch P, Heinig S.
PMID: 28304470
Wilhelm Roux Arch Entwickl Mech Org. 1968 Sep;161(3):241-248. doi: 10.1007/BF00573804.

The electrophoretic protein patterns of different regions in field and house crickets eggs were studied. All species showed marked quantitative and qualitative differences between anterior and posterior egg regions. This is valid for unfertilized eggs as well as early...

Orbitals from local RDMFT: Are they Kohn-Sham or natural orbitals?.

The Journal of chemical physics

Theophilou I, Lathiotakis NN, Gidopoulos NI, Rubio A, Helbig N.
PMID: 26254641
J Chem Phys. 2015 Aug 07;143(5):054106. doi: 10.1063/1.4927784.

Recently, an approximate theoretical framework was introduced, called local reduced density matrix functional theory (local-RDMFT), where functionals of the one-body reduced density matrix (1-RDM) are minimized under the additional condition that the optimal orbitals satisfy a single electron Schrödinger...

Heat shock protein 70 expression patterns in dermal explants in response to ablative fractional phothothermolysis, microneedle, or scalpel wounding.

Wounds : a compendium of clinical research and practice

Helbig D, Mobius A, Simon JC, Paasch U.
PMID: 25881332
Wounds. 2011 Mar;23(3):59-67.

UNLABELLED: Fractionated ablative laser intervention is effective for treating aged skin by inducing epidermal and/or dermal remodeling. The microneedle device is also used to initiate wound healing. In a previous study, the authors showed a clear time-dependent HSP70 expression...

Is it time for erythropoietin use in acute myeloid leukemia and allogeneic hematopoietic stem cell transplantation patients?.

Chinese clinical oncology

Helbig G, Kyrcz-Krzemień S.
PMID: 25841400
Chin Clin Oncol. 2012 Dec;1(2):22. doi: 10.3978/j.issn.2304-3865.2012.11.13.

No abstract available.

Fractal geometry of surface areas of sand grains probed by pulsed field gradient NMR.

Physical review letters

Stallmach F, Vogt C, Kärger J, Helbig K, Jacobs F.
PMID: 11909371
Phys Rev Lett. 2002 Mar 11;88(10):105505. doi: 10.1103/PhysRevLett.88.105505. Epub 2002 Feb 25.

Pulsed field gradient NMR self-diffusion studies of water were used to determine surface-to-volume ratios and specific surface areas of the grains forming a glacial sand deposit. Both quantities exhibit a noninteger power-law dependence as a function of the diameters...

Measurements of a nonlinear refractive index with a single laser pulse.

Applied optics

Hein J, Helbig M, Rentsch S.
PMID: 18250786
Appl Opt. 1997 Feb 20;36(6):1173-6. doi: 10.1364/ao.36.001173.

We demonstrate a theoretical model and the experimental proof of a new method for n(2) measurements using single pulses. The advantage of the method is fast measurement, a simple setup, and independence from small nonlinear absorptions and thermal effects....

Showing 1 to 12 of 265 entries