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Showing 1 to 12 of 297 entries
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Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser.

Applied optics

Xiong L, Hofmann P, Schülzgen A, Peyghambarian N, Albert J.
PMID: 24979414
Appl Opt. 2014 Jun 20;53(18):3848-53. doi: 10.1364/AO.53.003848.

We propose and demonstrate a 5-cm-long monolithic dual-wavelength single-longitudinal mode distributed Bragg reflector (DBR) all-phosphate fiber laser. Strong UV-induced fiber Bragg gratings are directly written in highly Er/Yb codoped phosphate fiber. The separation between gratings is selected as 1...

Deep UV-induced near-infrared photodarkening of Er/Yb-doped and undoped phosphate fibers.

Optics letters

Xiong L, Hofmann P, Schülzgen A, Peyghambarian N, Albert J.
PMID: 24321957
Opt Lett. 2013 Oct 15;38(20):4193-6. doi: 10.1364/OL.38.004193.

Photodarkening (PD) of Er/Yb-doped and undoped phosphate fibers caused by pulsed 193 nm irradiation from an ArF excimer laser to form Bragg grating mirrors is investigated. Doped and undoped phosphate fibers exhibit the same level of significant UV-induced PD...

BIOFRAG - a new database for analyzing BIOdiversity responses to forest FRAGmentation.

Ecology and evolution

Pfeifer M, Lefebvre V, Gardner TA, Arroyo-Rodriguez V, Baeten L, Banks-Leite C, Barlow J, Betts MG, Brunet J, Cerezo A, Cisneros LM, Collard S, D'Cruze N, da Silva Motta C, Duguay S, Eggermont H, Eigenbrod F, Hadley AS, Hanson TR, Hawes JE, Heartsill Scalley T, Klingbeil BT, Kolb A, Kormann U, Kumar S, Lachat T, Lakeman Fraser P, Lantschner V, Laurance WF, Leal IR, Lens L, Marsh CJ, Medina-Rangel GF, Melles S, Mezger D, Oldekop JA, Overal WL, Owen C, Peres CA, Phalan B, Pidgeon AM, Pilia O, Possingham HP, Possingham ML, Raheem DC, Ribeiro DB, Ribeiro Neto JD, Douglas Robinson W, Robinson R, Rytwinski T, Scherber C, Slade EM, Somarriba E, Stouffer PC, Struebig MJ, Tylianakis JM, Tscharntke T, Tyre AJ, Urbina Cardona JN, Vasconcelos HL, Wearn O, Wells K, Willig MR, Wood E, Young RP, Bradley AV, Ewers RM.
PMID: 24967073
Ecol Evol. 2014 May;4(9):1524-37. doi: 10.1002/ece3.1036. Epub 2014 Mar 27.

Habitat fragmentation studies have produced complex results that are challenging to synthesize. Inconsistencies among studies may result from variation in the choice of landscape metrics and response variables, which is often compounded by a lack of key statistical or...

Automatic Optimization of the Computation Graph in the Nengo Neural Network Simulator.

Frontiers in neuroinformatics

Gosmann J, Eliasmith C.
PMID: 28522970
Front Neuroinform. 2017 May 04;11:33. doi: 10.3389/fninf.2017.00033. eCollection 2017.

One critical factor limiting the size of neural cognitive models is the time required to simulate such models. To reduce simulation time, specialized hardware is often used. However, such hardware can be costly, not readily available, or require specialized...

160 W 800 fs Yb:YAG single crystal fiber amplifier without CPA.

Optics express

Markovic V, Rohrbacher A, Hofmann P, Pallmann W, Pierrot S, Resan B.
PMID: 26480102
Opt Express. 2015 Oct 05;23(20):25883-8. doi: 10.1364/OE.23.025883.

We demonstrate a compact and simple two-stage Yb:YAG single crystal fiber amplifier which delivers 160 W average power, 800 fs pulses without chirped pulse amplification. This is the highest average power of femtosecond laser based on SCF. Additionally, we...

Pluto's interaction with its space environment: Solar wind, energetic particles, and dust.

Science (New York, N.Y.)

Bagenal F, Horányi M, McComas DJ, McNutt RL, Elliott HA, Hill ME, Brown LE, Delamere PA, Kollmann P, Krimigis SM, Kusterer M, Lisse CM, Mitchell DG, Piquette M, Poppe AR, Strobel DF, Szalay JR, Valek P, Vandegriff J, Weidner S, Zirnstein EJ, Stern SA, Ennico K, Olkin CB, Weaver HA, Young LA.
PMID: 26989259
Science. 2016 Mar 18;351(6279):aad9045. doi: 10.1126/science.aad9045.

The New Horizons spacecraft carried three instruments that measured the space environment near Pluto as it flew by on 14 July 2015. The Solar Wind Around Pluto (SWAP) instrument revealed an interaction region confined sunward of Pluto to within...

Influence of acute normobaric hypoxia on physiological variables and lactate turn point determination in trained men.

Journal of sports science & medicine

Ofner M, Wonisch M, Frei M, Tschakert G, Domej W, Kröpfl JM, Hofmann P.
PMID: 25435769
J Sports Sci Med. 2014 Dec 01;13(4):774-81. eCollection 2014 Dec.

The goal of this study is to evaluate the response of physiological variables to acute normobaric hypoxia compared to normoxia and its influence on the lactate turn point determination according to the three-phase model of energy supply (Phase I:...

Strategies for the anchoring of metal complexes, clusters, and colloids inside nanoporous alumina membranes.

Chemistry (Weinheim an der Bergstrasse, Germany)

Braunstein P, Kormann HP, Meyer-Zaika W, Pugin R, Schmid G.
PMID: 11192098
Chemistry. 2000 Dec 15;6(24):4637-46. doi: 10.1002/1521-3765(20001215)6:24<4637::aid-chem4637>3.0.co;2-a.

Two complementary strategies are presented for the anchoring of molecular palladium complexes, of cobalt or platinum clusters or of gold colloids inside the nanopores of alumina membranes. The first consists in the one step condensation of an alkoxysilyl functional...

Apical versus equatorial disposition of substituents in tetraoxyphosphoranes bearing a 1,3,2-dioxaphosphocin ring: implications on apicophilicity in trigonal bipyramidal phosphorus.

Inorganic chemistry

Kommana P, Kumaraswamy S, Vittal JJ, Kumara Swamy KC.
PMID: 11978098
Inorg Chem. 2002 May 06;41(9):2356-63. doi: 10.1021/ic010935w.

New spirocyclic (amino/amido)tetraoxyphosphoranes CH(2)(6-t-Bu-4-Me-C(6)H(2)O)(2)P(NRR')(O(2)C(6)Cl(4)) [R = Me, R' = Ph (1), R = R' = i-Pr (2); R = R' = H (3); R = H, R' = Ph (4)] and the isothiocyanatotetraoxyphosphorane CH(2)(6-t-Bu-4-Me-C(6)H(2)O)(2)P(NCS)(O(2)C(6)Cl(4)) (5) have been synthesized. X-ray...

[P,P-Di-tert-butyl-N-trimethylsilyl-P-(trimethylsilylamino)phosphine imidato-kappa2N,N']bis(pyridine-kappaN)lithium(I).

Acta crystallographica. Section C, Crystal structure communications

Schultz M, Straub BF, Hofmann P.
PMID: 11932535
Acta Crystallogr C. 2002 Apr;58:M256-7. doi: 10.1107/s0108270102002706. Epub 2002 Mar 21.

In the title compound, [Li(C(14)H(36)N(2)PSi(2))(C(5)H(5)N)(2)], the bulky chelating monoanionic P,P-di-tert-butyl-N-trimethylsilyl-P-(trimethylsilylamino)phosphine imidate ligand and two pyridine ligands bind to Li in a pseudo-tetrahedral arrangement with twofold symmetry. The Li-N(phosphine) distance is 2.048 (5) A, while the Li.P distance is 2.520...

A trigonal planar mu 3-fluorido coinage metal complex from a dicationic (diphosphinomethane)copper(I) dimer: syntheses, structures, and bonding.

Inorganic chemistry

Straub BF, Rominger F, Hofmann P.
PMID: 12526521
Inorg Chem. 2000 May 15;39(10):2113-9. doi: 10.1021/ic991173w.

The triflate and hexafluorophosphate salts of [Cu2(mu-dtbpm)2]2+ (1(2+)) [dtbpm = bis(di-tert-butylphosphino)methane, tBu2PCH2PtBu2] and of [Cu3(mu 3-F)(mu-dtbpm)3]2+ (2(2+)) were synthesized and characterized. Coordination of solvent or counterions to 1(2+) is observed neither in solution nor in the solid state. The...

Pentacoordinate phosphoranes with reversed apicophilicity as stable intermediates in a mitsunobu-type reaction.

The Journal of organic chemistry

Satish Kumar N, Kommana P, Vittal JJ, Kumara Swamy KC.
PMID: 12227794
J Org Chem. 2002 Sep 20;67(19):6653-8. doi: 10.1021/jo011150a.

Diisopropyl azodicarboxylate (DIAD) undergoes a cycloaddition reaction with the cyclic phosphites CH(2)(6-t-Bu-4-Me-C(6)H(2)O)(2)PX (1) [X = NCS (a), N(3) (b), Cl (c), NHMe (d) and Ph (e)] to afford the novel pentacoordinate phosphoranes 2a-e as crystalline solids. This result is...

Showing 1 to 12 of 297 entries