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Articles de revues sur le sujet « D-Complex Structures »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 11 mars 2023

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1

Ciampolini, P., A. Pierantoni et G. Baccarani. « Efficient 3-D simulation of complex structures ». IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 10, no 9 (1991) : 1141–49. http://dx.doi.org/10.1109/43.85760.

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Kado, Y., K. Aritake, N. Uodome, Y. Okano, N. Okazaki, H. Matsumura, Y. Urade et T. Inoue. « Human hematopoietic prostaglandin D synthase inhibitor complex structures ». Journal of Biochemistry 151, no 4 (13 mars 2012) : 447–55. http://dx.doi.org/10.1093/jb/mvs024.

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Hu, Chun-guang, Xiao-dong Hu, Lin-yan Xu, Tong Guo et Xiao-tang Hu. « 3-D profile measurement for complex micro-structures ». Optoelectronics Letters 1, no 3 (novembre 2005) : 205–8. http://dx.doi.org/10.1007/bf03033844.

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Hassan, S. F. « O(d,d;R) deformations of complex structures and extended worldsheet supersymmetry ». Nuclear Physics B 454, no 1-2 (novembre 1995) : 86–102. http://dx.doi.org/10.1016/0550-3213(95)00384-5.

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Yoon, Y. K., J. H. Park et M. G. Allen. « Multidirectional UV Lithography for Complex 3-D MEMS Structures ». Journal of Microelectromechanical Systems 15, no 5 (octobre 2006) : 1121–30. http://dx.doi.org/10.1109/jmems.2006.879669.

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Moraes, Roberto A. V., et R. O. Hansen. « Constrained inversion of gravity fields for complex 3-D structures ». GEOPHYSICS 66, no 2 (mars 2001) : 501–10. http://dx.doi.org/10.1190/1.1444940.

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As part of a research program to develop gravity interpretation tools that can be merged with seismic techniques, a full 3-D complex structural inversion scheme for (possibly multibody) polyhedral models has been developed. The forward modeling algorithm was adopted from previous work. Because the inverse problem is generally very ill posed, several methods of regularizing the inversion were investigated and a combination of the most useful was adopted. The combination includes (i) a structured matrix formulation for the system equations, (ii) an analytical expression for the Jacobian calculation, (iii) first‐derivative damping, (iv) a choice of damping parameter based on a variation of the trust region method, (v) a weighted scheme for parameter correction, and (vi) complete freezing of degrees of freedom found not to influence the gravity field significantly. This combination yields a robust inversion which was successfully demonstrated on data over the Galveston Island salt dome, offshore Texas. Variations of the technique should be applicable to magnetic data, which would make the method useful for mining problems and petroleum exploration settings involving volcanic structures.
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Ako, Masayuki, Masahiko Machida, Tomio Koyama, Takekazu Ishida et Masaru Kato. « Vortex state of nano-scaled superconducting complex structures (d-dot) ». Physica C : Superconductivity 412-414 (octobre 2004) : 544–47. http://dx.doi.org/10.1016/j.physc.2003.12.058.

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Ako, Masayuki, Masahiko Machida, Tomio Koyama, Takekazu Ishida et Masaru Kato. « Vortex dynamics in nano-scaled superconducting complex structures (d-dot) ». Physica C : Superconductivity 426-431 (octobre 2005) : 122–26. http://dx.doi.org/10.1016/j.physc.2005.03.065.

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Siahkoohi, Hamid R., et Gordon F. West. « 3-D seismic imaging of complex structures in glacial deposits ». GEOPHYSICS 63, no 3 (mai 1998) : 1041–52. http://dx.doi.org/10.1190/1.1444382.

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A small‐scale, shallow‐penetration 3-D reflection seismic survey has been carried out over stratified glacial formations to test the method’s potential for delineating fine structural details with a reasonable field effort and cost. Recording was carried out with a 96-channel engineering seismograph. Blank shotgun shells were used as the energy source. Field records were obtained with usable reflection energy up to 500 Hz, exploring approximately a 220-m cubical volume. Although special processing was required to attenuate strongly dispersed and scattered surface waves, a stacked data volume of good quality has been assembled. More than 15 reflecting horizons with vertical resolution of about 1.5 m were clearly delineated within the Wisconsin sediments. Results are in good agreement with local outcrops and core information. The identified reflectors (interbeds) within the Late Wisconsin tills are extremely important. These reflectors may provide potential “hydraulic channels” for the movement of surface contaminants through the till into underlying aquifers.
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Brunebarbe, Yohan. « Symmetric differentials and variations of Hodge structures ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2018, no 743 (1 octobre 2018) : 133–61. http://dx.doi.org/10.1515/crelle-2015-0109.

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Abstract Let D be a simple normal crossing divisor in a smooth complex projective variety X. We show that the existence on X-D of a non-trivial polarized complex variation of Hodge structures with integral monodromy implies that the pair (X,D) has a non-zero logarithmic symmetric differential (a section of a symmetric power of the logarithmic cotangent bundle). When the corresponding period map is generically immersive, we show more precisely that the logarithmic cotangent bundle is big.
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de Kemp, Eric A. « Visualization of complex geological structures using 3-D Bézier construction tools ». Computers & ; Geosciences 25, no 5 (juin 1999) : 581–97. http://dx.doi.org/10.1016/s0098-3004(98)00159-9.

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Richardson, Adam R., Marvin J. Dainoff, Leonard S. Mark, James L. Smart et Niles Davis. « Representing Complex Data Sets as Virtual Structures ». Proceedings of the Human Factors and Ergonomics Society Annual Meeting 46, no 17 (septembre 2002) : 1641–44. http://dx.doi.org/10.1177/154193120204601724.

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This paper describes a research strategy in which complex data sets are represented as physical objects in a virtual 3-D environment. The advantage of such a representation is that it allows the observer to actively explore the virtual environment so that potential ambiguities found in typical 3-D projections could be resolved by the transformation resulting from the change in viewing perspective. The study reported here constitutes an initial condition in which subjects compared relative size of virtual cubes from two different viewpoints. These results can serve as a basis for construction of cube-like objects representing the underlying conceptual structure of a data set
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Terazawa, Yuki, et Toru Takeuchi. « Generalized Response Spectrum Analysis for Structures with Dampers ». Earthquake Spectra 34, no 3 (août 2018) : 1459–79. http://dx.doi.org/10.1193/092217eqs188m.

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In this study, a computational seismic design routine is proposed based on a generalized response spectrum analysis for highly indeterminate structures with energy-dissipation members, such as viscous or elasto-plastic dampers. Complex stiffness terms are introduced to account for displacement-dependent damping, and a three-dimensional (3-D) element stiffness matrix with complex axial stiffness is proposed for elasto-plastic dampers. A modified complete quadratic combination method previously developed for real symmetric damped systems is extended to complex asymmetric damped systems, based on a theoretical analysis of eigenvalue equations. The response is evaluated by iteratively conducting complex eigenvalue analysis and modal combination. The accuracy is confirmed through comparison to nonlinear response history analysis of 2-D frame models. Finally, an example application is presented of a 3-D truss tower seismically retrofitted by replacing the braces with viscoelastic and then elasto-plastic dampers. The proposed design routine is used to rapidly identify novel and efficient damper arrangements and sizing distributions, avoiding computationally intensive nonlinear response history analysis.
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Operto, M. Stéphane, Sheng Xu et Gilles Lambaré. « Can we quantitatively image complex structures with rays ? » GEOPHYSICS 65, no 4 (juillet 2000) : 1223–38. http://dx.doi.org/10.1190/1.1444814.

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Ray‐based prestack depth migration fails to image quantitatively complex structures when a single arrival—for example, the first or the strongest one—is taken into account. In this paper, we investigate whether accounting for multiple arrivals in ray‐based preserved amplitude prestack depth migration allows one to improve quantitative imaging of complex media. The asymptotic ray‐Born migration/inversion, originally designed to process one single arrival, is extended to the case of multiple arrivals by accounting for the cross‐contributions of all the source and receiver raypaths. Multiple arrivals in the folded ray fields are computed by a dynamic ray tracing based on a wavefront construction technique. With an application to the complex Marmousi model, we demonstrate that ray‐Born inversion can provide a reliable quantitative estimation of the relative impedance perturbation even in the complex deep part of the model, for which the amplitudes were underestimated drastically when only a single arrival was used, either the first or the strongest one. This 2-D case study shows that complex structures can be imaged quantitatively with rays. Future studies will require the optimizing of the implementation of ray‐Born migration/inversion with multiple arrivals before considering 3-D applications.
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Turowski, J. « Fast computation of coupled fields in complex, 3‐D, industrial electromagnetic structures ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 17, no 4 (août 1998) : 489–505. http://dx.doi.org/10.1108/03321649810210785.

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LIU, Li-Nong, Feng-Lin CUI et Jian-Feng ZHANG. « Seismic Modeling with One-Way Wave Equation in 3-D Complex Structures ». Chinese Journal of Geophysics 47, no 3 (mai 2004) : 583–91. http://dx.doi.org/10.1002/cjg2.524.

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Clendenon, Jeffrey L., Carrie L. Phillips, Ruben M. Sandoval, Shiaofen Fang et Kenneth W. Dunn. « Voxx : a PC-based, near real-time volume rendering system for biological microscopy ». American Journal of Physiology-Cell Physiology 282, no 1 (1 janvier 2002) : C213—C218. http://dx.doi.org/10.1152/ajpcell.2002.282.1.c213.

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Confocal and two-photon fluorescence microscopy have advanced the exploration of complex, three-dimensional biological structures at submicron resolution. We have developed a voxel-based three-dimensional (3-D) imaging program (Voxx) capable of near real-time rendering that runs on inexpensive personal computers. This low-cost interactive 3-D imaging system provides a powerful tool for analyzing complex structures in cells and tissues and encourages a more thorough exploration of complex biological image data.
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LEBRUN, CLAUDE. « FANO MANIFOLDS, CONTACT STRUCTURES, AND QUATERNIONIC GEOMETRY ». International Journal of Mathematics 06, no 03 (juin 1995) : 419–37. http://dx.doi.org/10.1142/s0129167x95000146.

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Let Z be a compact complex (2n+1)-manifold which carries a complex contact structure, meaning a codimension-1 holomorphic sub-bundle D⊂TZ which is maximally non-integrable. If Z admits a Kähler-Einstein metric of positive scalar curvature, we show that it is the Salamon twistor space of a quaternion-Kähler manifold (M4n, g). If Z also admits a second complex contact structure [Formula: see text], then Z=CP2n+1. As an application, we give several new characterizations of the Riemannian manifold HPn= Sp(n+1)/(Sp(n)×Sp(1)).
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19

Ginsburg, Avi, Tal Ben-Nun, Roi Asor, Asaf Shemesh, Lea Fink, Roee Tekoah, Yehonatan Levartovsky et al. « D+ : software for high-resolution hierarchical modeling of solution X-ray scattering from complex structures ». Journal of Applied Crystallography 52, no 1 (1 février 2019) : 219–42. http://dx.doi.org/10.1107/s1600576718018046.

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This paper presents the computer program D+ (https://scholars.huji.ac.il/uriraviv/book/d-0), where the reciprocal-grid (RG) algorithm is implemented. D+ efficiently computes, at high-resolution, the X-ray scattering curves from complex structures that are isotropically distributed in random orientations in solution. Structures are defined in hierarchical trees in which subunits can be represented by geometric or atomic models. Repeating subunits can be docked into their assembly symmetries, describing their locations and orientations in space. The scattering amplitude of the entire structure can be calculated by computing the amplitudes of the basic subunits on 3D reciprocal-space grids, moving up in the hierarchy, calculating the RGs of the larger structures, and repeating this process for all the leaves and nodes of the tree. For very large structures (containing over 100 protein subunits), a hybrid method can be used to avoid numerical artifacts. In the hybrid method, only grids of smaller subunits are summed and used as subunits in a direct computation of the scattering amplitude. D+ can accurately analyze both small- and wide-angle solution X-ray scattering data. This article describes how D+ applies the RG algorithm, accounts for rotations and translations of subunits, processes atomic models, accounts for the contribution of the solvent as well as the solvation layer of complex structures in a scalable manner, writes and accesses RGs, interpolates between grid points, computes numerical integrals, enables the use of scripts to define complicated structures, applies fitting algorithms, accounts for several coexisting uncorrelated populations, and accelerates computations using GPUs. D+ may also account for different X-ray energies to analyze anomalous solution X-ray scattering data. An accessory tool that can identify repeating subunits in a Protein Data Bank file of a complex structure is provided. The tool can compute the orientation and translation of repeating subunits needed for exploiting the advantages of the RG algorithm in D+. A Python wrapper (https://scholars.huji.ac.il/uriraviv/book/python-api) is also available, enabling more advanced computations and integration of D+ with other computational tools. Finally, a large number of tests are presented. The results of D+ are compared with those of other programs when possible, and the use of D+ to analyze solution scattering data from dynamic microtubule structures with different protofilament number is demonstrated. D+ and its source code are freely available for academic users and developers (https://bitbucket.org/uriraviv/public-dplus/src/master/).
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20

GAO, YA-JUN. « DOUBLE STRUCTURES AND DOUBLE SYMMETRIES FOR THE EINSTEIN–KALB–RAMOND THEORY ». International Journal of Modern Physics A 21, no 02 (20 janvier 2006) : 361–72. http://dx.doi.org/10.1142/s0217751x06031259.

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We further study the two-dimensional reduced Einstein–Kalb–Ramond (EKR) theory in the axisymmetric case by using the so-called double-complex function method. We find a doubleness symmetry of this theory and exploit it so that some double-complex d×d matrix Ernst-like potential can be constructed, and the associated equations of motion can be extended into a double-complex matrix Ernst-like form. Then we give a double symmetry group [Formula: see text] for the EKR theory and verify that its action can be realized concisely by a double-complex matrix, form generalization of the fractional linear transformation on the Ernst potential. These results demonstrate that the theory under consideration possesses more and richer symmetry structures. Moreover, as an application, we obtain an infinite chain of double-solutions of the EKR theory showing that the double-complex method is more effective. Some of the results in this paper cannot be obtained by the usual (nondouble) scheme.
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Fukuda, S., N. Shigyo, K. Kato et S. Nakamura. « A ULSI 2-D capacitance simulator for complex structures based on actual processes ». IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 9, no 1 (1990) : 39–47. http://dx.doi.org/10.1109/43.45855.

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Ru, Heng, Melissa G. Chambers, Tian-Min Fu, Alexander B. Tong, Maofu Liao et Hao Wu. « Molecular Mechanism of V(D)J Recombination from Synaptic RAG1-RAG2 Complex Structures ». Cell 163, no 5 (novembre 2015) : 1138–52. http://dx.doi.org/10.1016/j.cell.2015.10.055.

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Ru, Heng, Melissa G. Chambers, Tian-Min Fu, Alexander B. Tong, Maofu Liao et Hao Wu. « Molecular Mechanism of V(D)J Recombination from Synaptic RAG1-RAG2 Complex Structures ». Cell 163, no 7 (décembre 2015) : 1807. http://dx.doi.org/10.1016/j.cell.2015.12.003.

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Cheng, Pei-Chi, Bing-Han Li, Feng-Shuen Tseng, Po-Ching Liang, Chia-Her Lin et Wei-Ren Liu. « Synthesis, Structures and Electrochemical Properties of Lithium 1,3,5-Benzenetricarboxylate Complexes ». Polymers 11, no 1 (12 janvier 2019) : 126. http://dx.doi.org/10.3390/polym11010126.

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Four lithium coordination polymers, [Li3(BTC)(H2O)6] (1), [Li3(BTC)(H2O)5] (2), [Li3(BTC)(μ2-H2O)] (3), and [Li(H2BTC)(H2O)] (4) (H3BTC = 1,3,5-benzenetricarboxylatic acid), have been synthesized and characterized. All the structures have been determined using single crystal X-ray diffraction studies. Complexes 1 and 2 have two-dimensional (2-D) sheets, whereas complex 3 has three-dimensional (3-D) frameworks and complex 4 has one-dimensional (1-D) tubular chains. The crystal-to-crystal transformation was observed in 1–3 upon removal of water molecules, which accompanied the changes in structures and ligand bridging modes. Furthermore, the electrochemical properties of complexes 3 and 4 have been studied to evaluate these compounds as electrode materials in lithium ion batteries with the discharge capacities of 120 and 257 mAhg−1 in the first thirty cycles, respectively.
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Kim, Cheol, et Sung Hwan Lee. « Complex 3-D Behaviors of Composite Cylinders with 3-D Shape Memory Alloy Actuators ». International Journal of Modern Physics B 17, no 08n09 (10 avril 2003) : 1851–56. http://dx.doi.org/10.1142/s0217979203019770.

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Shape memory alloys (SMAs) are often used in smart materials and structures as the active components. Their ability to provide a high force and large displacement has been useful in many applications, including devices for damage control, active structural acoustic control, dynamic tuning, and shape control. In this paper, the radial displacement control of an externally pressurized elliptic composite cylinder where the SMA strip actuators are bonded on its in and outer surface is investigated numerically. The elliptic composite cylinder with SMAs was designed and analyzed to determine the feasibility of such a system for the removal of stiffeners from externally pressurized stiffened composite stuctures. SMAs start to transform from the martensitic into the austenitic state upon actuation through resistive heating, simultaneously recover the prestrain, and thus cause the composite cylinder to expand in the radial direction. The externally pressurized composite cylinder with the SMA actuators was analyzed using the 3-D finite element method.
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Ohkubo, Isao, et Takao Mori. « dz2 orbital character of polyhedra in complex solid-state transition-metal compounds ». Dalton Transactions 49, no 2 (2020) : 431–37. http://dx.doi.org/10.1039/c9dt04091a.

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dz2 orbitals of the transition metals make major contributions to electronic structures near the Fermi levels in d0-, d1-complex transition-metal compounds containing face-sharing, edge-sharing octahedra, or edge-sharing trigonal prismatic layers.
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Roosen, Andreas. « 3-D Structures via Tape Casting and Lamination ». Advances in Science and Technology 45 (octobre 2006) : 397–406. http://dx.doi.org/10.4028/www.scientific.net/ast.45.397.

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Miniaturisation and multi-functionality are the driving forces in the field of many technical market segments. Ceramic multilayer technology via tape casting and lamination is one of the key technologies to generate complex, highly integrated devices for future applications. The technique offers a tremendous potential for the integration of different materials combined with the possibility to form complex 3-D structures by layered object manufacturing. The ceramic multilayer technology is based on shaping, screen-printing and stacking of individual ceramic green tapes, which are laminated and co-fired. The tapes can offer ferroelectric, piezoelectric and magnetic behaviour, insulating and semi-conducting properties, voltage-, temperature- and atmosphere-dependent resistances, high thermal conductivity, corrosion resistance, or bio inert behaviour. For the integration of additional features like reactors or sensors, the described layered manufacturing method allows to introduce simultaneously microchannels and other cavities. - New developments in processing and in materials concepts are addressed to overcome limitations and to take maximum advantage of this technique. The technique is illustrated considering e.g. microwave circulators for communication, sensors for automotive applications, and piezoelectric actuators as examples, which demonstrate the potential of the technology for the manufacture of highly integrated multifunctional systems.
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Chitnumsub, Penchit, Aritsara Jaruwat, Pinpunya Riangrungroj, Wanwipa Ittarat, Krittikar Noytanom, Worrapoj Oonanant, Jarunee Vanichthanankul et al. « Structures ofPlasmodium vivaxserine hydroxymethyltransferase : implications for ligand-binding specificity and functional control ». Acta Crystallographica Section D Biological Crystallography 70, no 12 (22 novembre 2014) : 3177–86. http://dx.doi.org/10.1107/s1399004714023128.

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Plasmodiumparasites, the causative agent of malaria, rely heavily onde novofolate biosynthesis, and the enzymes in this pathway have therefore been explored extensively for antimalarial development. Serine hydroxymethyltransferase (SHMT) fromPlasmodiumspp., an enzyme involved in folate recycling and dTMP synthesis, has been shown to catalyze the conversion of L- and D-serine to glycine (Gly) in a THF-dependent reaction, the mechanism of which is not yet fully understood. Here, the crystal structures ofP. vivaxSHMT (PvSHMT) in a binary complex with L-serine and in a ternary complex with D-serine (D-Ser) and (6R)-5-formyltetrahydrofolate (5FTHF) provide clues to the mechanism underlying the control of enzyme activity. 5FTHF in the ternary-complex structure was found in the 6Rform, thus differing from the previously reported structures of SHMT–Gly–(6S)-5FTHF from other organisms. This suggested that the presence of D-Ser in the active site can alter the folate-binding specificity. Investigation of binding in the presence of D-Ser and the (6R)- or (6S)-5FTHF enantiomers indicated that both forms of 5FTHF can bind to the enzyme but that only (6S)-5FTHF gives rise to a quinonoid intermediate. Likewise, a large surface area with a highly positively charged electrostatic potential surrounding thePvSHMT folate pocket suggested a preference for a polyglutamated folate substrate similar to the mammalian SHMTs. Furthermore, as inP. falciparumSHMT, a redox switch created from a cysteine pair (Cys125–Cys364) was observed. Overall, these results assert the importance of features such as stereoselectivity and redox status for control of the activity and specificity ofPvSHMT.
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Aveiro, H. C., et J. D. Huba. « Equatorial spread F studies using SAMI3 with two-dimensional and three-dimensional electrostatics ». Annales Geophysicae 31, no 12 (5 décembre 2013) : 2157–62. http://dx.doi.org/10.5194/angeo-31-2157-2013.

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Abstract. This letter presents a study of equatorial F region irregularities using the NRL SAMI3/ESF model, comparing results using a two-dimensional (2-D) and a three-dimensional (3-D) electrostatic potential solution. For the 3-D potential solution, two cases are considered for parallel plasma transport: (1) transport based on the parallel ambipolar field, and (2) transport based on the parallel electric field. The results show that the growth rate of the generalized Rayleigh–Taylor instability is not affected by the choice of the potential solution. However, differences are observed in the structures of the irregularities between the 2-D and 3-D solutions. Additionally, the plasma velocity along the geomagnetic field computed using the full 3-D solution shows complex structures that are not captured by the simplified model. This points out that only the full 3-D model is able to fully capture the complex physics of the equatorial F region.
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Masuno, Hiroyuki, Daisuke Morizono, Teikichi Ikura, Nobutoshi Ito, Hector DeLuca, Hirokazu Tamamura et Masato Shimizu. « 2P032 Crystal structures of vitamin D receptor in complex with lithocholic acid derivatives(29. Protein structure and dynamics (II),Poster Session,Abstract,Meeting Program of EABS & ; BSJ 2006) ». Seibutsu Butsuri 46, supplement2 (2006) : S303. http://dx.doi.org/10.2142/biophys.46.s303_4.

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Lancellotti, Vito, et Antonius G. Tijhuis. « CONVERGENCE PROPERTIES OF A DIAKOPTICS METHOD FOR ELECTROMAGNETIC SCATTERING FROM 3-D COMPLEX STRUCTURES ». Progress In Electromagnetics Research M 24 (2012) : 127–40. http://dx.doi.org/10.2528/pierm12030805.

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Kolundzija, Branko, et Drazen Sumic. « Electromagnetic simulation of complex and electrically large structures in WIPL-D Pro [Application Notes] ». IEEE Microwave Magazine 9, no 6 (décembre 2008) : 159–62. http://dx.doi.org/10.1109/mmm.2008.929694.

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GJOYSTDAL, H., J. E. REINHARDSEN et K. ASTEBOL. « COMPUTER REPRESENTATION OF COMPLEX 3-D GEOLOGICAL STRUCTURES USING A NEW "SOLID MODELING" TECHNIQUE* ». Geophysical Prospecting 33, no 8 (décembre 1985) : 1195–211. http://dx.doi.org/10.1111/j.1365-2478.1985.tb01359.x.

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Jandieri, Vakhtang, Paolo Baccarelli, Guido Valerio et Giuseppe Schettini. « 1-D Periodic Lattice Sums for Complex and Leaky Waves in 2-D Structures Using Higher Order Ewald Formulation ». IEEE Transactions on Antennas and Propagation 67, no 4 (avril 2019) : 2364–78. http://dx.doi.org/10.1109/tap.2019.2894280.

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Doan, Thanh Thi Ngoc, Jin-Kwang Kim, Ho-Phuong-Thuy Ngo, Huyen-Thi Tran, Sun-Shin Cha, Kyung Min Chung, Kim-Hung Huynh, Yeh-Jin Ahn et Lin-Woo Kang. « Crystal structures of d-alanine-d-alanine ligase from Xanthomonas oryzae pv. oryzae alone and in complex with nucleotides ». Archives of Biochemistry and Biophysics 545 (mars 2014) : 92–99. http://dx.doi.org/10.1016/j.abb.2014.01.009.

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Wu, Meng, Bernard Mourrain, André Galligo et Boniface Nkonga. « Hermite Type Spline Spaces over Rectangular Meshes with Complex Topological Structures ». Communications in Computational Physics 21, no 3 (7 février 2017) : 835–66. http://dx.doi.org/10.4208/cicp.oa-2016-0030.

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AbstractMotivated by the magneto hydrodynamic (MHD) simulation for Tokamaks with Isogeometric analysis, we present splines defined over a rectangular mesh with a complex topological structure, i.e., with extraordinary vertices. These splines are piecewise polynomial functions of bi-degree (d,d) and parameter continuity. And we compute their dimension and exhibit basis functions called Hermite bases for bicubic spline spaces. We investigate their potential applications for solving partial differential equations (PDEs) over a physical domain in the framework of Isogeometric analysis. For instance, we analyze the property of approximation of these spline spaces for the L2-norm; we show that the optimal approximation order and numerical convergence rates are reached by setting a proper parameterization, although the fact that the basis functions are singular at extraordinary vertices.
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Sahoo, Laxminarayan, Anadi Singhamahapatra et Satyanarayan Sahoo. « Synthesis of 1,3-divalent glycoconjugates with diverse structures and their functionalization ». Journal of the Serbian Chemical Society 83, no 5 (2018) : 539–48. http://dx.doi.org/10.2298/jsc170905030s.

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A series of novel 1,3-difunctionalized glycoconjugates were synthesized using a sequence of regioselective functionalization and stereoselective glycosidation of D-glucose and D-GlcNAc. Regioselective C-3 functionalization of sugar molecules was achieved by chemical functionalization of isopropylidene or oxazoline protected sugar derivatives. The structural diversity at the anomeric carbon was explored by stereoselective chemical glycosidation. The oxazoline protected D-GlcNAc derivative gave either pyranose or furanose derivatives on glycosidation depending on the amount of Lewis acid used. The diversely functionalized glycoconjugates with azide or alkyne groups are potentially useful for the synthesis of multifunctionalized complex glycoconjugates via click reactions.
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Clark, Howard W., Rose-Marie Mackay, Mary E. Deadman, Derek W. Hood, Jens Madsen, E. Richard Moxon, J. Paul Townsend et al. « Crystal Structure of a Complex of Surfactant Protein D (SP-D) and Haemophilus influenzae Lipopolysaccharide Reveals Shielding of Core Structures in SP-D-Resistant Strains ». Infection and Immunity 84, no 5 (7 mars 2016) : 1585–92. http://dx.doi.org/10.1128/iai.01239-15.

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The carbohydrate recognition domains (CRDs) of lung collectin surfactant protein D (SP-D) recognize sugar patterns on the surface of lung pathogens and promote phagocytosis. UsingHaemophilus influenzaeEagan strains expressing well-characterized lipopolysaccharide (LPS) surface structures of various levels of complexity, we show that bacterial recognition and binding by SP-D is inversely related to LPS chain extent and complexity. The crystal structure of a biologically active recombinant trimeric SP-D CRD complexed with a delipidated Eagan 4A LPS suggests that efficient LPS recognition by SP-D requires multiple binding interactions utilizing the three major ligand-binding determinants in the SP-D binding pocket, with Ca-dependent binding of inner-core heptose accompanied by interaction of anhydro-Kdo (4,7-anhydro-3-deoxy-d-manno-oct-2-ulosonic acid) with Arg343 and Asp325. Combined with enzyme-linked immunosorbent assays (ELISAs) and fluorescence-activated cell sorter (FACS) binding analyses, our results show that extended LPS structures previously thought to be targets for collectins are important in shielding the more vulnerable sites in the LPS core, revealing a mechanism by which pathogens with complex LPS extensions efficiently evade a first-line mucosal innate immune defense. The structure also reveals for the first time the dominant form of anhydro-Kdo.
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Lomjanský, Dominik, Filip Varga, Cyril Rajnák, Ján Moncoľ, Roman Boča et Ján Titiš. « Redetermination of Zero-Field Splitting in [Co(qu)2Br2] and [Ni(PPh3)2Cl2] Complexes ». Nova Biotechnologica et Chimica 15, no 2 (1 décembre 2016) : 200–211. http://dx.doi.org/10.1515/nbec-2016-0020.

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AbstractA mononuclear CoII complex, [Co(qu)2Br2], and NiII complex, [Ni(PPh3)2Cl2], (qu = quinoline, PPh3 = triphenylphosphine) have been reinvestigated. Their crystal and molecular structures are reported along with IR and UV-Vis spectra. Magnetism of both complexes has been studied by using the DC SQUID magnetometry. These complexes exhibit a moderate magnetic anisotropy expressed by zero-field splitting parameter D. The D-value is positive for both complexes with D/hc = +5.94 cm−1 and D/hc = +12.76 cm−1, that is also confirmed by ab initio calculations.
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Jia, Dong Dong, Jian Yin Zhou, Xue Jun Shao et Xi Bao Zhang. « Three-Dimensional Flow Structures and Suspended-Sediment Transport in the Dam Area of Large Reservoir ». Applied Mechanics and Materials 501-504 (janvier 2014) : 1981–85. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1981.

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The three-dimensional (3-D) flow structures and suspended-load sediment transport processes in the dam area of the Three Gorges Project (TGP) with large water depth were simulated by a 3-D mathematical model. The characteristics of flow structures and suspended-load concentration distribution were analyzed based on the simulated results. Strong 3-D features of flow structures can be found in the dam area, the secondary currents are significant. The suspended-load sediment concentration reduced much faster in wider valley areas, where deposits accumulated. Due to impact of secondary currents, the maximum concentration of suspended-load occurs at the convex side while the minimum at the concave side. It demonstrates that the 3-D numerical modeling is a useful prediction technique and research tool to enhance our understanding of flow structures and mass transport processes in natural rivers with complex boundary.
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Agard, David A., Jason R. Swedlow, Yasushi Hiraoka, Michael R. Paddy et John W. Sedat. « Chromosome structure and dynamics as revealed by 3-D and 4-D imaging ». Proceedings, annual meeting, Electron Microscopy Society of America 50, no 1 (août 1992) : 588–89. http://dx.doi.org/10.1017/s0424820100123349.

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Cellular DNA is packaged into chromosomes through complex processes whereby the DNA becomes compacted up to 10,000-fold by assembly into higher-order structures. In spite of many decades of intense study, the details of this process are not known. In addition, there is little information describing the dynamics of these higher-order structures during DNA replication, transcription, and mitosis. The goal of our laboratory is to use state-of-the-art 3-D imaging methods to understand how DNA is arranged into chromosomes and how chromosomes are spatially and temporally organized in the nucleus.
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Lee, M. E., et E. O. de Neijs. « The morphology of moth and butterfly wing scales which exhibit reflective diffraction phenomena ». Proceedings, annual meeting, Electron Microscopy Society of America 50, no 2 (août 1992) : 1010–11. http://dx.doi.org/10.1017/s0424820100129681.

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The butterfly and moth families illustrate how nature has used diffractive micro-relief structures to achieve unique optical effects. Whereas the majority of insects use pigments (absorption) or occasionally thin film multi-layer structures (interference) to create colour, the wings of many families of butterfly and moth have complex 2-D or 3-D arrangements of submicron grating structures which produce zero and higher order diffraction conditions.The special properties of a diffraction grating can be understood by light incident perpendicularly on a transmission grating. The light is diffracted into a number of grating orders at angles θn given by the grating equation sin θn = n λ/d where λ is the wavelength of the light, n = 0, ± 1, --- and d is the grating period. The same conditions are valid for reflective diffraction structures. If the grating period is finer than the wavelength ie. d < λ, no first order diffraction exists for normal illumination.
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Olczak, A., M. L. Główka, M. Szczesio, J. Bojarska, Z. Wawrzak et W. L. Duax. « The first crystal structure of a gramicidin complex with sodium : high-resolution study of a nonstoichiometric gramicidin D–NaI complex ». Acta Crystallographica Section D Biological Crystallography 66, no 8 (9 juillet 2010) : 874–80. http://dx.doi.org/10.1107/s0907444910019876.

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The crystal structure of the nonstoichiometric complex of gramicidin D with NaI has been studied using synchrotron radiation at 100 K. The limiting resolution was 1.25 Å and theRfactor was 16% for 19 883 observed reflections. The general architecture of the antiparallel two-stranded gramicidin dimers in the studied crystal was a right-handed antiparallel double-stranded form that closely resembles the structures of other right-handed species published to date. However, there were several surprising observations. In addition to the significantly different composition of linear gramicidins identified in the crystal structure, including the absence of the gramicidin C form, only two cationic sites were found in each of the two independent dimers (channels), which were partially occupied by sodium, compared with the seven sites found in the RbCl complex of gramicidin. The sum of the partial occupancies of Na+was only 1.26 per two dimers and was confirmed by the similar content of iodine ions (1.21 ions distributed over seven sites), which was easily visible from their anomalous signal. Another surprising observation was the significant asymmetry of the distributions and occupancies of cations in the gramicidin dimers, which was in contrast to those observed in the high-resolution structures of the complexes of heavier alkali metals with gramicidin D, especially that of rubidium.
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Conde, O. M., J. Perez et M. P. Catedra. « Stationary phase method application for the analysis of radiation of complex 3-D conducting structures ». IEEE Transactions on Antennas and Propagation 49, no 5 (mai 2001) : 724–31. http://dx.doi.org/10.1109/8.929626.

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Schneider, Kyle D., Caleb J. Ortega, Nicholas A. Renck, Robert A. Bonomo, Rachel A. Powers et David A. Leonard. « Structures of the Class D Carbapenemase OXA-24 from Acinetobacter baumannii in Complex with Doripenem ». Journal of Molecular Biology 406, no 4 (mars 2011) : 583–94. http://dx.doi.org/10.1016/j.jmb.2010.12.042.

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Takeda, Kosei, Hiromi Yoshida, Ken Izumori et Shigehiro Kamitori. « X-ray structures of Bacillus pallidus d-arabinose isomerase and its complex with l-fucitol ». Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics 1804, no 6 (juin 2010) : 1359–68. http://dx.doi.org/10.1016/j.bbapap.2010.01.018.

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Popovici, Elena. « Classification of contact structures associated with the CR-structure of the complex indicatrix ». Analele Universitatii "Ovidius" Constanta - Seria Matematica 25, no 1 (26 janvier 2017) : 163–76. http://dx.doi.org/10.1515/auom-2017-0013.

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Abstract By regarding the complex indicatrix as an embedded CR-hypersurface of the holomorphic tangent bundle in a fixed point, we analyze some aspects of the relations between its CR structure and the considered contact structure. Moreover, using the classification of the almost contact metric structures associated with a strongly pseudo-convex CR-structure, of D. Chinea and C. Gonzales, we determine the classes corresponding to the natural contact structure of the complex indicatrix and the new structures obtained under a gauge transformation.
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Utkina, L. N., et R. G. Danielian. « The polysemantic words in metaphors used in political texts ». Язык и текст 4, no 2 (2017) : 75–81. http://dx.doi.org/10.17759/langt.2017040209.

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The article deals with polysemantic words that are often found in complex metaphorical structures, which can be seen in speeches of modern politicians (B. Obama, D. Trump, D. Cameron, Queen Elizabeth II, etc.). The usage of metaphorical polysemy in political discourse and its reasons are considered and explained. The main goal of the article consists in the examination of the polysemantic structures phenomenon, the diversity of their meanings and their usage in modern English as parts of the metaphoric phrases.
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Kim, Nam-Hee, Hye-Jung Kim, Dong-Il Kang, Ki-Woong Jeong, Jung-Kul Lee, Yangmee Kim et Deok-Kun Oh. « Conversion Shift of d-Fructose to d-Psicose for Enzyme-Catalyzed Epimerization by Addition of Borate ». Applied and Environmental Microbiology 74, no 10 (31 mars 2008) : 3008–13. http://dx.doi.org/10.1128/aem.00249-08.

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ABSTRACT The conversion yield of d-psicose from d-fructose by a d-psicose 3-epimerase from Agrobacterium tumefaciens increased with increasing molar ratios of borate to fructose, up to a ratio of 0.6. The formation of the psicose-borate complex was the result of the higher binding affinity of borate for psicose than for fructose. The formed psicose-borate complex did not participate in the conversion reaction, acting instead as if the product had been removed. Thus, more fructose was converted to psicose in order to restore the equilibrium. The maximum conversion yield of psicose with borate was about twofold that obtained without borate and occurred at a 0.6 molar ratio of borate to fructose. Above this ratio, the conversion yield decreased with increasing ratios, because the amount of fructose available decreased through the formation of the initial fructose-borate complex. The structures of the two sugar-borate complexes, determined by nuclear magnetic resonance spectroscopy, were α-d-psicofuranose cis-C-3,4 diol borate and β-d-fructopyranose cis-C-4,5 diol borate.
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Morozov, Vladimir, Katrien Meert, Philippe Smet, Dirk Poelman, Artem Abakumov et Joke Hadermann. « Incommensurate modulated structures and luminescence in scheelites ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C177. http://dx.doi.org/10.1107/s2053273314098222.

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Scheelite (CaWO4) related compounds (A',A'')n[(B',B'')O4]m with B', B''=W and/or Mo are promising new materials for red phosphors in pc-WLEDs (phosphor-converted white-light-emitting-diode) and solid-state lasers. Scheelites can be prepared with a large concentration of vacancies in the A sublattice, giving compositions characterized by a (A'+A''):(B'O4+B''O4) ratio different from 1:1. The creation of cation vacancies in the scheelite-type framework and the ordering of A cations and vacancies are a new factor in controlling the scheelite-type structure and properties. Very often the substitution of Ca2+ by M+ and R3+ (R3+ = rare earth elements) in the scheelite-type structure leads to switching the structure from 3D to (3+n)D (n = 1,2) regime. The creation and ordering of A-cation vacancies and the effect of cation substitutions in the scheelite-type framework are investigated as a factor controlling the scheelite-type structure and luminescent properties of CaGd2(1-x)Eu2x(MoO4)4(1-y)(WO4)4y (0≤x≤1, 0≤y≤1) solid solutions. Within this series all complex molybdenum oxides have (3+2)D incommensurately modulated structures with superspace group I41/a(α,β,0)00(-β,α,0)00, while the structures of all tungstates are (3+1)D incommensurately modulated with superspace group I2/b(αβ0)00. In both cases the modulation arises due to cation-vacancy ordering at the A site. The replacement of the smaller Gd3+ by the larger Eu3+ at the A-sublattice does not affect the nature of the incommensurate modulation, but an increasing replacement of Mo6+ by W6+ switches the modulation from (3+2)D to (3+1)D regime. Acknowledgement. This research was supported by FWO (project G039211N, Flanders Research Foundation) and Russian Foundation for Basic Research (Grants 11-03-01164, and 12-03-00124).
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