2,625 research outputs found
Stammbuch G. F. H. Hecht
No full textEnthält 107 Stammbucheinträge in Deutsch, Latein, Französisch u.a. von J. H. Bachran; Georg Friedrich Bamme (Theologe); Friedrich Wilhelm Borgold; C. Friedr. Bruchs; Joh. Buchka; C.W. Dennhardt;Christiana Augusta Juliana Grumbach; August Friedrich Grumbach; Wilhelm Bernhard Grumbach (Jurist); Ch. Keferstein; Carl Christoph Hecht (Vater); Caroline Hecht; Friederike Hecht (Schwester); Emilie Hecht (Schwester); Wilhelm Hecht; J.D. Heinze; C.W. Hetzell; August Timotheus Hoffmann; C. T. Hoffmann; Johannes August Hoffmann; Friedrich Klingner; Friedrich August Kloss; Andreas Rudolf Köhler; Friederike Köhler (?-1802); Gustav Friedrich Krause; Joh. Gotth. Krause; J. M. Merbeth; Henriette Pernice (Cousine); Wilhelmine Pernice geb. Panning (Tante); Carl, F. Schulze; Carl Gotth. Schwarz; Carl Friedrich Senff; Carl Adolf Senff; C. G. Senff; C.C. Senff; Rosina Dorothea Senff geb. Lietzmann; Friedrich Sontag; Friedrich Wedemeyer; Carl WehrmannHandschrift DE-3, GND 2024680-8, Signatur: Yg St. 8° 66/70Einband: Ledereinband, marmoriertes Leder über Pappe; Rollenstempelverzierung (Goldprägung); Filete; goldgeprägtes Rückenetikett (Fragment); Vorderdeckel mit geprägtem Monogramm in Goldpressung: G. F. H.; Rückdeckel mit Jahreszahl: 1794; Kapitale; Stehkantenverzierung (Goldprägung), punzierter Goldschnitt, Vor-und Nachsatz mit Modeldruckpapier.Zustand: Papier leicht gebräunt und fingerfleckig; Einband mit Gebrauchsspuren, Rückenleder brüchig, am Kopf eingerissen, oberes Kapital gelöst, Lederbezug wellig; Ecken und Kanten stark berieben.Exlibris der Vorbesitzers (Stula) im VorderspiegelS. 155/156 doppelt vergebenEintragungsorte: Halle (90), Lettin, Mansfeld, Merseburg u.a.Aquarelle S. 15, 159, 163, 197; Stickerei S. 105, 117, 171, 175; Bleistiftzeichnung S. 134; kolorierter Kupferstich S. 155; Kalligraphie S. 179; lavierte Federzeichnung S. 25
Quaestiones theologicae de virtute et sacramento poenitentiae : in imperiali monasterio Zwifaltensi concertationi publicae expositae
No full textpraeside P. Udalrico Rotheisler ..., respondentibus ...F. Gallo de Florin ..., F. Alphonso Hecht ..., F. Placido Greinwald ..., F. Aurelio Fischer ... anno M. DC. LXXXV. mense Septembri, die [...] ...Disp., Kloster Zwiefalten, 168
Chiral dimethylindium aminoalkoxides
No full textChiral dimethylindiumaminoalkoxides of general formula Me2InOR* [OR*=(+);(-)-2-piperidyl-methoxy (1), (+);(-)-dimethylamino-2-propoxy (2), (S)-(+)-amino-2-propoxy (3), (S)-alpha, alpha -diphenyl-2-pyrrolidinyl-methoxy (4)] have been prepared by reaction of Me3In with the corresponding aminoalcohols HOR+ and characterized by H-1 and (13)Cnmr spectroscopy and X-rap crystallography. Dimeric molecules of 1-4 are composed of two mu (2)-O-bridged chelating rings, the latter formed due to N-In donor-acceptor interaction. This geometry is comparable with that of aluminium and gallium analogues previously investigated. In the case of 1 and 4, the formation of the N-In bond proceeds stereospecifically. The absolute structure of 3 and 4 was confirmed by refinement of the Flack parameter. 1: C2/m; a = 15.999(3) Angstrom, b = 9.803(2) Angstrom, c = 7.410(1) Angstrom, beta =111.04(3)degrees; Z = 2; density (calc.) = 1.586 Mg/m(3); R1 = 0.025 for 944 independent reflections with F-2 > 2 sigma (F-2). 2: C2/c; a = 13.184(3) Angstrom, b = 9.987(2) Angstrom, c = 15.851(3) Angstrom, beta = 90.66(3)degrees; Z = 4; density (calc.) = 1.573 Mg/m(3); R1 = 0.021 for 1890 independent reflections with F-2 > 2 sigma (F-2). 3: P2(1); a = 8.701(2) Angstrom, b = 11.944(2) Angstrom, c = 8.831(1) Angstrom, beta = 113.26(3)degrees; Z = 2; density (calc.) = 1.725 Mg/m(3); R1 = 0.018 for 2873 independent reflections with F-2 > 2 sigma (F-2). 4: R3; a = 29.708(4) Angstrom, c = 11.017(2) Angstrom; Z = 9; density (calc.) = 1.265 Mg/m(3); R1 = 0.034 for 5890 independent reflections with F-2 > 2 sigma (F-2)
Light-controlled reversible modulation of frontier molecular orbital energy levels in trifluoromethylated diarylethenes
No full textAmong bistable photochromic molecules, diarylethenes (DAEs) possess the distinct feature that upon photoisomerization they undergo a large modulation of their pelectronic system, accompanied by a marked shift of the HOMO/LUMO energies and hence oxidation/reduction potentials. The electronic modulation can be utilized to remote-control charge-as well as energy-transfer processes and it can be transduced to functional entities adjacent to the DAE core, thereby regulating their properties. In order to exploit such photoswitchable systems it is important to precisely adjust the absolute position of their HOMO and LUMO levels and to maximize the extent of the photoinduced shifts of these energy levels. Here, we present a comprehensive study detailing how variation of the substitution pattern of DAE compounds, in particular using strongly electron-accepting and chemically stable trifluoromethyl groups either in the periphery or at the reactive carbon atoms, allows for the precise tuning of frontier molecular orbital levels over a broad energy range and the generation of photoinduced shifts of more than 1 eV. Furthermore, the effect of different DAE architectures on the transduction of these shifts to an adjacent functional group is discussed. Whereas substitution in the periphery of the DAE motif has only minor implications on the photochemistry, trifluoromethylation at the reactive carbon atoms strongly disturbs the isomerization efficiency. However, this can be overcome by using a nonsymmetrical substitution pattern or by combination with donor groups, rendering the resulting photoswitches attractive candidates for the construction of remote-controlled functional systems
NANOSCALE MONITORING OF RESPONSIVE SUPRAMOLECULAR NANOSTRUCTURES AT THE SOLID-LIQUID INTERFACE
No full textThe self-assembly of small molecular modules into non-covalently linked polymeric nanostructures is a subject of continuous interest [1]. In particular, supramolecular structures with a high degree of order can be obtained through the self-association of organic molecules on flat solid surfaces. Such structures can be used as scaffolds to position electrically/optically active groups in pre-determined locations in 2D [2] thereby paving the way towards a wide range of applications, e.g. in electronic and optical devices. Among weak interactions, H-bonding offers high control over the process of molecular self-assembly because it combines reversibility, directionality, specificity and cooperativity. Such a unique character is the basis of sophisticated programs for self-assembly such as those based on the Watson–Crick base pairing which directs the formation of the helical structure of DNA.
While the self-assembly of guanines into G-quartet based architectures on solid surfaces has been studied by Scanning Tunneling Microscopy (STM) under ultrahigh vacuum (UHV) [3], STM explorations at the solid-liquid interface have been primarily carried out on guanosine derivatives [4]. In this lecture we will present a sub-molecularly resolved STM study at the solid-liquid interface of the metal templated reversible assembly/reassembly process of a N9-alkylguanine into highly ordered quartets and ribbons on highly oriented pyrolitic graphite (HOPG) surfaces. The self-assembly of guanine derivatives on HOPG has been studied as neat component[5] and upon sub-sequent addition of cryptand [2.2.2] molecules, potassium picrate and triflic acid to trigger the reversible interconversion between two different highly ordered supramolecular motifs, i.e. H-bonded ribbon and G-quartet based architectures. In-situ STM imaging provided the first direct evidence on the sub-nm scale of a dynamer operating at surfaces. [6]
Finally we will also provide the first example of sub-molecularly resolved vertically oriented switchable chromophores in physisorbed monolayers by monitoring the cis-trans isomerization of a physisorbed azobenzene at surfaces. [7]
The nanoscale visualization of such supramolecular interconversion at the solid-liquid interface opens new avenues towards understanding the mechanism of formation and functioning of complex architectures. Furthermore, the in-situ reversible assembly and re-assembly between two highly ordered supramolecular structures at a given surface represents the first step towards the generation of nanopatterned responsive architectures.
[1] J. M. Lehn, Science, 295, 2002, 2400.
[2] G. P. Spada, S. Lena, S. Masiero, S. Pieraccini, M. Surin, P. Samorì, Adv. Mater., 2008, 20, 2433; A. Ciesielski, L. Piot, P. Samorì, A. Jouaiti, M. W. Hosseini, Adv. Mater., 2009, 21, 1131.
[3] R. Otero, M. Schock, L. M. Molina, E. Laegsgaard, I. Stensgaard, B. Hammer, F. Besenbacher, Angew. Chem. Int. Ed., 2005, 44, 2270.
[4] G. Gottarelli, S. Masiero, E. Mezzina, S. Pieraccini, J. P. Rabe, P. Samorì, G. P. Spada, Chem. Eur. J., 2000, 6, 3242; T. Giorgi, S. Lena, P. Mariani, M. A. Cremonini, S. Masiero, S. Pieraccini, J. P. Rabe, P. Samorì, G. P. Spada, G. Gottarelli, J. Am. Chem. Soc., 2003, 125, 14741; S. Lena, G. Brancolini, G. Gottarelli, P. Mariani, S. Masiero, A. Venturini, V. Palermo, O. Pandoli, S. Pieraccini, P. Samorì, G. P. Spada, Chem. Eur. J., 2007, 13, 3757.
[5] A. Ciesielski, R. Perone, S. Pieraccini, G.P. Spada, P. Samorì, Chem. Commun 2010, 46, 4493.
[6] A. Ciesielski, S. Lena, S. Masiero, G. P. Spada, P. Samorì, Angew. Chem. Int. Ed. 2010, 49, 1963.
[7] D. Bléger, A. Ciesielski, P. Samorì, S. Hecht, 2010 submitted
Psychological and Psychophysiological Effects of a High-Mountain Expedition to Tibet
No full textIn March 1999 a team of 8 mountaineers (6 men and 2 women) climbed up the 6th highest mountain of the world: The Cho Oyo (8201 m), located in the high mountains of Tibet. During the expedition, we investigated the effects of high mountaineering on various psychological variables (e.g., anxiety) and psychophysiological variables (e.g. blood pressure, pulse, skin-resistance) as well as the ability to relax at different points of time (2 premeasures before, three measures during, and one post-measure immediate after the Expedition). Due to a long-term monitoring of the skin resistance, we can summarize that three different adaptation levels can be defined, that appear under increasing pressure: Inhibition of overload, unspecific hypersensibility and exhaustion. The results can show that a telemedical assessment is possible and necessary even under the circumstances of a highmountaineering expedition in order to determine and predict deficits in behaviour and health risks for individuals at high altitudes
Mariculture in the WIO region "Challenges and Prospects".
No full textSeychelles has a relatively long history of prawn farming, which was established on Coetivy Island in 1989
by the Islands Development Company Ltd and the Seychelles Marketing Board and later taken over and
managed by the latter. The farm comprised of two hatcheries and around 200 ponds and occupied an area
of around 96 ha, and when in full production had a workforce of around 350 people (mainly Thai and Sri
Lankan nationals). Production of
Penaeus monodon
(Black Tiger prawn) peaked at 1200 tonnes per annum in
2004, but by 2007 had declined to just under 400 tonnes (Fig. 1). Broodstcok w
as imported from Madagascar
and Mozambique. The product was held in high esteem internationally and locally (Hecht, 2009). For
several reasons production at the prawn farm ceased in late 2008. Amongst others these included the high
operational costs due to the location of the farm, which is situated approximately 300 km away from the
inner islands and the difficulty to produce sufficient numbers of post larv
ae for stocking into grow-out
ponds and other private sector interests. Much of the hardware of the farm has been sold, but the pond
infrastructure remains available for future developments.Publishe
An approximation of anisotropic metrics from higher order interpolation error for triangular mesh adaptation.
No full textInternational audienceFor any positive integer k, the (k+1)st-order tensor for the partial derivatives of a given order of a function at a point has its anisotropic behaviour characterized by a positive definite matrix, which involves a nonlinear minimization with respect to the matrix. Using the error estimates described in [W. M. Cao, SIAM J. Numer. Anal. 45 (2007), no. 6, 2368–2391; MR2361894 (2008k:65264)] and [F. Hecht, in Numerical analysis and scientific computing for partial differential equations and their challenging applications, 108–120, CIMNE, 2008; per bibl.], a formulation of the optimization problem is given and an algorithm is presented for its resolution [cf. J.-M. Mirebeau, Constr. Approx. 32 (2010), no. 2, 339–383; MR2677884 (2011g:65278)]. The main purpose of this paper is to perform anisotropic mesh adaptation for numerical simulations with a Lagrange finite element approximation of degree k, k>1. Numerical experiments of metrics computed, and examples of mesh adaptation for a function with metrics generated by the algorithm presented, are also given
An approximation of anisotropic metrics from higher order interpolation error for triangular mesh adaptation.
No full textInternational audienceFor any positive integer k, the (k+1)st-order tensor for the partial derivatives of a given order of a function at a point has its anisotropic behaviour characterized by a positive definite matrix, which involves a nonlinear minimization with respect to the matrix. Using the error estimates described in [W. M. Cao, SIAM J. Numer. Anal. 45 (2007), no. 6, 2368–2391; MR2361894 (2008k:65264)] and [F. Hecht, in Numerical analysis and scientific computing for partial differential equations and their challenging applications, 108–120, CIMNE, 2008; per bibl.], a formulation of the optimization problem is given and an algorithm is presented for its resolution [cf. J.-M. Mirebeau, Constr. Approx. 32 (2010), no. 2, 339–383; MR2677884 (2011g:65278)]. The main purpose of this paper is to perform anisotropic mesh adaptation for numerical simulations with a Lagrange finite element approximation of degree k, k>1. Numerical experiments of metrics computed, and examples of mesh adaptation for a function with metrics generated by the algorithm presented, are also given
Semper Semper
No full textThis report was edited by C. Petersen (Otto Versand). It contains contributions by C. Baert (Europay), T. Hecht (FOGRA), Ralf Kuron (FOGRA), G. Lacoste (IBM), D. Livas (EUROCOM), C. Petersen (Otto Versand), M. Schunter (Univ. Dortmund), A. Weber (Univ. Freiburg), B. Wildhaber (r3), D. Whinnett (Univ. Freiburg). First Year Surveys, Requirements and Trials SEMPER Document Deliverable D05
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