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Search Results: 1 - 10 of 9921 matches for " Frank Blockhuys "
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(E)-1-(2,4,6-Trimethoxyphenyl)pent-1-en-3-one
Alain Collas,Frank Blockhuys
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034641
Abstract: The title compound, C14H18O4, was obtained unintentionally as the major product of an attempted synthesis of (E,E)-2,5-bis[2-(2,4,6-trimethoxyphenyl)ethenyl]pyrazine. The crystal packing features layers based on two weak C—H...O hydrogen bonds involving the O atom of the carbonyl group and two Omethoxy...Cmethoxy interactions [3.109 (2) ]. The sheets are interconnected via methoxy–methoxy dimers and C—H...π interactions.
(E,E)-N1-(2,3,4,5,6-Pentafluorobenzylidene)-N4-(3,4,5-trimethoxybenzylidene)benzene-1,4-diamine
Alain Collas,Frank Blockhuys
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681104904x
Abstract: The title compound, C23H17F5N2O3, forms a layered centrosymmetric crystal structure in which C—H...F interactions are responsible for the formation of planar ribbons along [110], methoxy–methoxy (C—H...O) interactions for the formation of layers parallel to [overline113], and OCH3...π and C—F...π interactions for the stacking of these layers.
4-[(E)-2-(2,4,6-Trinitrophenyl)ethylidene]benzonitrile
Roeland De Borger,Alain Collas,Frank Blockhuys
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810038584
Abstract: In the crystal of the title compound, C15H8N4O6, the molecules are organized in layers due to their linkage by weak C—H...N hydrogen bonds. The layers are themselves interconnected by weak C—H...O hydrogen bonds and π–π interactions [centroid–centroid distances = 3.8690 (15) and 3.9017 (16) ]. The dihedral angle between the rings is 31.9 (1)°.
2-(4-Formyl-2,6-dimethoxyphenoxy)acetic acid
Alain Collas,Christophe M. L. Vande Velde,Frank Blockhuys
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810043990
Abstract: In the title compound, C11H12O6, the aldehyde group is disordered over two sites in a 0.79:0.21 ratio. The carboxylic acid chain is found in the [ap,ap] conformation due to two intramolecular O—H...O hydrogen bonds.
3-(2-Formylphenoxy)propanoic acid
Alain Collas,Christophe M. L. Vande Velde,Frank Blockhuys
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810038079
Abstract: In the structure of the title compound, C10H10O4, the carboxyl group forms a catemer motif in the [100] direction instead of the expected dimeric structures. The carboxylic acid group is found in the syn conformation and the three-dimensional organization in the crystal is based on C—H...O and O—H...O interactions.
Racemic 1,2,3,4,7,8,9,10-octafluoro-6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine: an octafluorinated analogue of Tr ger's base
Christophe M. L. Vande Velde,Delphine Didier,Frank Blockhuys,Sergey Sergeyev
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808002602
Abstract: The title compound, C15H6F8N2, possesses a non-crystallographic twofold axis. The dihedral angle between the two benzene rings is 98.4 (2)°. The crystal structure involves intermolecular C—H...F hydrogen bonds.
Solution for Rational Expectation Models Free of Complex Numbers  [PDF]
Frank Hespeler
Theoretical Economics Letters (TEL) , 2011, DOI: 10.4236/tel.2011.13011
Abstract: This paper approaches the problem of the potential for complex-valued solutions within linear macroeconomic models with rational expectations. It finds that these problems are associated with a specific solution method for the underlying model. The paper establishes that the danger of complex-valued solutions always can be eliminated by forcing those solutions to fulfill additional constraints. These constraints are essentially restrictions on the degrees of freedoms in indeterminate solutions.
A Characterization of the Optimal Management of Heterogeneous Environmental Assets under Uncertainty  [PDF]
Frank Raymond
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.25093
Abstract: The application herein involves the optimal management of renewable and nonrenewable resources within the context of a stochastic model of optimal control. By characterizing the two dimensional Bellman solution, three rules with respect to resource management are established. Within the context of coastal development, this analysis may help to explain why renewable resources may become increasingly vulnerable to random external shocks as nonrenewable resources are depleted. Although existence of an optimal closed form solution to the multi-sector Bellman model remains an open mathematical question, this analysis offers a characterization which can be applied to other scenarios in economics or finance in which two assets following stochastic processes interact.
Investigating the Suitability of Agile Methods for Requirements Development of Home Care Systems  [PDF]
Sandra Kelly, Frank Keenan
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.39104
Abstract: The ageing population in developed countries brings many benefits but also many challenges, particularly in terms of the development of appropriate technology to support their ability to remain in their own home environment. One particular challenge reported for such Home Care Systems (HCS) is the identification of an appropriate requirements development technique for dealing with the typical diverse stakeholders involved. Agile Methods (AMs) recognize this challenge and propose techniques that could be useful. This paper examines the desirable characteristics identified for requirements development in HCS and investigates the extent to which agile practices conform to these. It also sets out future work to improve the situation for the non compliant points found.
Free Anterolateral Thigh Perforator Flap for Head and Neck Cancer Resection in a Nonagenarian  [PDF]
Frank Lin, Damien Grinsell
Modern Plastic Surgery (MPS) , 2012, DOI: 10.4236/mps.2012.21001
Abstract: With an aging population, free flap reconstruction for head and neck cancer ablation in the elderly is becoming more commonplace. In nonagenarians, however, such major operations are still rarely offered due to its physiological demands. We report the first case of successful resection and reconstruction of head and neck cancer with a free perforator flap in a 96 year old patient. We feel that with careful patient and flap selection, careful preoperative workup and close collaboration between treating teams, age alone should not preclude patients from receiving the best possible curative treatment and reconstruction in head and neck cancers. Even in nonagenarians, perforator free flaps, such as the anterolateral thigh flap, can be used safely to achieve good functional and aesthetic outcomes.
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