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Search Results: 1 - 10 of 84823 matches for " W. Seidel "
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An Investigation into the Radiation Damage of the Silicon Detectors of the H1-PLUG Calorimeter within the HERA environment
W. Hildesheim,M. Seidel
Physics , 1995,
Abstract: The silicon detectors used in the H1-PLUG calorimeter have shown increasing aging effects during the '94 run period of the electron proton storage ring HERA. These effects were particularly manifest as degradation of the signal to noise level and the calibration stability. The reasons for this behaviour have been found to be correlated with radiation damage to the silicon oxide passivation edges of the detectors in strong and fluctuating increases of the leakage currents and in severe changes of the flat band voltages. Depletion voltages however are found to be stable and therefore bulk damage of the silicon can be excluded. A comparison with measurements made by thermoluminescence dosimeters as well as related laboratory experiments suggest that the aging is due to very low energetic electrons and photons.
cis-Bis(nitrato-κ2O,O′)bis(triethylphosphine oxide-κO)nickel(II)
Rüdiger W. Seidel
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809015724
Abstract: In the title compound, [Ni(NO3)2(C6H15OP)2], the NiII ion, lying on a crystallographic twofold axis, adopts a distorted octahedral coordination, consisting of O-donor atoms of two symmetry-related triethylphospine oxide and two bidentate nitrate ligands.
Chances and Limits of the Coordination Chemistry with Bis(benzene-l,2-dithiolato) Ligands
Wolfram W. Seidel,F. Ekkehardt Hahn
Bioinorganic Chemistry and Applications , 2005, DOI: 10.1155/bca.2005.69
Abstract: The incorporation of benzene-l,2-dithiolato building blocks into supramolecular coordination assemblies is the main objective of the investigations described here. Special interest is directed towards dinuclear complexes with bis(benzene-l,2-dithiolato) ligands, which might be able to form helical structures. Bis(benzene-l,2-dithiolato) ligands are accessible by ortho-functionalization and subsequent linkage of two benzene-l,2-dithiol units. The preparation of well defined complexes of titanium, cobalt and nickel with bis(benzene-l,2-dithiolato) ligands requires strictly thermodynamic equilibration conditions. In that case the size and shape of the ligand backbone determine if dinuclear double-stranded or mononuclear chelate complexes are obtained. The dinuclear double-stranded complexes with Ni(II) and Ni(III) are characterized by a coplanar non-helical arrangement of the square-planar bis(benzene-l,2-dithiolato)nickelate moieties. The complete structural characterization of the series [M(C6H4S2-1,2)3]n- (n = 0, 1, 2) for molybdenum and tungsten indicates an interesting coordination chemistry of dinuclear triple-stranded complexes.
Alternating sleeping arrangements as a coping strategy for snorers and their bed partners—A prospective study  [PDF]
Stefan Seidel, Christian W?ber, Sabine Salhofer-Polanyi, Doris Lieba-Samal, Eleonore Pablik, Josef Zeitlhoferq, Gerhard Kl?sch
Health (Health) , 2013, DOI: 10.4236/health.2013.58A2002
Abstract:

Background: Despite overwhelming evidence for gender differences in sleep quality as well as gender-specific changes of sleep parameters with respect to habitual sleeping arrangements, studies on snorers and their bed partners have ignored the influence of individual quality of sleep as a potential co-factor. Objective: The objective of this study was to record subjective and objective sleep parameters and to analyze the effects of alternating of sleeping arrangements in snorers and their bed partners. Methods: Habitual snorers and their bed partners were recruited via newspaper articles not stating the exact purpose of the study. Both filled out a 90-day sleep diary. During this time, we recorded subjective and objective sleep parameters in the snorers and their bed partners via wrist actigraphy and sleep diaries for 14 days. For statistical analysis, we used two-sided t-tests and Spearman’s Rho. Results: The dataset included 45 snorers (11 females) and 45 bed partners (34 females) with a mean age of 47 ± 13 and 43 ± 12 years. Screening for sleep apnea yielded snoring without OSAS, mild-, moderate- and severe OSAS in 27 (60%), eight (18%), three (7%) and six (15%) snorers. PSQI total scores were significantly lower in snorers than in bed partners (4 ± 2 vs. 6 ± 4, p = 0.002). We could not find a significant correlation between subjective and objective sleep latency and efficiency. Couples who changed their sleeping arrangement were significantly younger than those who habitually slept alone or together (p = 0.01). Subjective sleep parameters of snorers or bed partners were not related to the number of consecutive nights spent either together or apart. Conclusions: Our study confirmed the weak correlation of subjective and objective sleep parameters in pairs with snoring problems. Couples changing their sleeping arrangement were the youngest among the whole group, but their separation of sleeping arrangements did not improve subjective sleep parameters.

Di-μ-chlorido-bis{aquachlorido[2,2′-thiobis(pyridine N-oxide)-κO]copper(II)}
Rüdiger W. Seidel,Iris M. Oppel
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809011076
Abstract: The crystal structure of the title compound, [Cu2Cl4(C10H8N2O2S)2(H2O)2], comprises neutral centrosymmetric μ-chloride-bridged dinuclear units. Each CuII ion is pentacoordinated by three chloride ligands, a pyridine N-oxide O atom and a water molecule. Intra- and intermolecular O—H...O hydrogen bonds occur between the coordinated water molecules and the uncoordinated and coordinated pyridine N-oxide groups of the 2,2′-thiobis(pyridine N-oxide) ligands, respectively.
β-Cyclodextrin 10.41-hydrate
Rüdiger W. Seidel,Bojidarka B. Koleva
Acta Crystallographica Section E , 2009, DOI: 10.1107/s160053680904865x
Abstract: The crystal structure of β-cyclodextrin, C42H70O35·10.41H2O, consists of truncated cone-shaped β-cyclodextrin molecules that are herringbone packed. The primary hydroxy groups form an intramolecular hydrogen-bonded array. The semipolar cavity of the cyclodextrin host is filled with water molecules, which show partial occupancy and disorder.
(R)-Di-tert-butyl 1,1′-binaphthyl-2,2′-dicarboxylate
Melanie Thoss,Rüdiger W. Seidel,Martin Feigel
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536808044309
Abstract: The crystal structure of the title compound, C30H30O4, comprises two crystallographically independent half-molecules which are completed by crystallographic twofold symmetry. The dihedral angles between the naphthalene ring planes are 85.83 (3) and 83.69 (3)° for the two molecules. The atoms of the tert-butyl group of one molecule are disordered over two sets of sites with occupancies of 0.60:0.40. The crystal packing is achieved via π–π stacking interactions between the naphthyl groups of adjacent molecules, with a separation of 3.790 (1) between the centroids of the rings.
Bis[(E)-4-(hydroxyiminomethyl)pyridinium] oxalate
Rüdiger W. Seidel,Manuela V. Winter,Iris M. Oppel
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807064136
Abstract: The formula unit of the title compound, 2C6H7N2O+·C2O42 , comprises two symmetry-equivalent 4-(hydroxyiminomethyl)pyridinium cations on general positions, linked through hydrogen bonding via an oxalate anion that resides on a crystallographic centre of symmetry. The crystal structure consists of infinite chains of cations and oxalate anions directed by O—H...O and multicentre N—H...O intermolecular hydrogen-bonding interactions.
Observation of Two-Exciton States in Perylene Bisimide Aggregates
Wolter S.,Seidel M.,Würthner F.,Lochbrunner S.
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134105035
Abstract: The behavior of excitons on perylene bisimide aggregates is investigated at high excitation densities by femtosecond absorption spectroscopy. Indications for a significant population in the two-exciton manifold are found.
Structural Diversity of Metallosupramolecular Assemblies Based on the Bent Bridging Ligand 4,4′-Dithiodipyridine
Rüdiger W. Seidel,Richard Goddard,Iris M. Oppel
Polymers , 2013, DOI: 10.3390/polym5020527
Abstract: 4,4′-Dithiodipyridine ( dtdp), also termed 4,4′-dipyridyldisulfide, is a bridging ligand of the 4,4′-bipyridine type. The introduction of the disulfide moiety inevitably leads to a relatively rigid angular structure, which exhibits axial chirality. More than 90 metal complexes containing the dtdp ligand have been crystallographically characterised until now. This review focuses on the preparation and structural diversity of discrete and polymeric metallosupramolecular assemblies constructed from dtdp as bridging ligands. These encompass metallamacrocycles with M 2L 2 topology and coordination polymers with periodicity in one or two dimensions. One-dimensional coordination polymers represent the vast majority of the metallosupramolecular structures obtained from dtdp. These include repeated rhomboids, zigzag, helical and arched chains among other types. In this contribution, we make an attempt to provide a comprehensive account of the structural data that are currently available for metallosupramolecular assemblies based on the bent bridging ligand dtdp.
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