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Auteur : Grafiati
Publié le 10 mars 2023
Mis à jour le 11 mars 2023

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1

Petrus, Rafał, Józef Utko, Joanna Petrus, Mohammad Awashra et Tadeusz Lis. « Use of group 13 aryloxides for the synthesis of green chemicals and oxide materials ». Dalton Transactions 51, no 10 (2022) : 4135–52. http://dx.doi.org/10.1039/d1dt03777c.

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Homo- and heterometallic group 13 aryloxides were obtained and used to synthesize attractive green chemicals, i.e., hydroxy acid glyceryl esters and star-shaped polyesters, or heterometallic oxide materials, i.e. γ-LiAlO2 and β-LiGaO2.
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2

Klüfers, P., et P. Mayer. « A Star-Shaped Heptanuclear Tetramine Cadmium(II) Complex ». Acta Crystallographica Section C Crystal Structure Communications 54, no 6 (15 juin 1998) : 722–25. http://dx.doi.org/10.1107/s0108270197019355.

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3

Gu, Ya-Qin, Chun Shao et Xin-Chu Fu. « Complete synchronization and stability of star-shaped complex networks ». Chaos, Solitons & ; Fractals 28, no 2 (avril 2006) : 480–88. http://dx.doi.org/10.1016/j.chaos.2005.07.002.

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4

Koen, C. « Can complex T Tauri star light curves be modelled with star-spots ? » Monthly Notices of the Royal Astronomical Society 500, no 1 (29 octobre 2020) : 1366–79. http://dx.doi.org/10.1093/mnras/staa3347.

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ABSTRACT ‘Transiting Exoplanet Survey Satellite’ photometry of 10 young stars with very complex periodic light curves is considered. Previous findings that these cannot be due to dark surface spots are re-evaluated by allowing arbitrarily shaped areas on the stellar surface to have sub-photospheric fluxes. This is done by approximating flux integrals by sums over surface elements. The unknown ratios of spot to photospheric fluxes are determined by lasso or ridge regression procedures. It is found that almost all light curves can be modelled very accurately in this way. The usual, if rarely stated, caveat applies – star-spot models presented in the paper are not unique.
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Chen, Zhu. « An Exact Analytical Solution for Star-Shaped Cracks ». Advanced Materials Research 1094 (mars 2015) : 458–63. http://dx.doi.org/10.4028/www.scientific.net/amr.1094.458.

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Using the method of complex analysis and by constructing conformal mapping, the study investigates the plane elasticity problem of star-shaped cracks and provides an analytical solution for the stress intensity factor (SIF) of crack-tip type I and II. Problems of the classic Griffith crack, the cross-shaped crack, concurrent uniformly distributed three-cracks and symmetrical eight-cracks are also simulated.
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6

Nakabayashi, Kazuhiro, et Hideharu Mori. « Novel Complex Polymers with Carbazole Functionality by Controlled Radical Polymerization ». International Journal of Polymer Science 2012 (2012) : 1–18. http://dx.doi.org/10.1155/2012/170912.

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This review summarizes recent advances in the design and synthesis of novel complex polymers with carbazole moieties using controlled radical polymerization techniques. We focus on the polymeric architectures of block copolymers, star polymers, including star block copolymers and miktoarm star copolymers, comb-shaped copolymers, and hybrids. Controlled radical polymerization ofN-vinylcarbazole (NVC) and styrene and (meth)acrylate derivatives having carbazole moieties is well advanced, leading to the well-controlled synthesis of complex macromolecules. Characteristic optoelectronic properties, assembled structures, and three-dimensional architectures are briefly introduced.
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7

Pang, Jun, Eric J. P. Marcotte, Corey Seward, R. Stephen Brown et Suning Wang. « A Blue Luminescent Star-Shaped ZnII Complex that Can Detect Benzene ». Angewandte Chemie 113, no 21 (5 novembre 2001) : 4166–69. http://dx.doi.org/10.1002/1521-3757(20011105)113:21<4166 ::aid-ange4166>3.0.co;2-j.

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Tian, Naichang, Pan Ma, Quanbo Wang, Xianyao Zhang, Jianzhuang Jiang et Ming Bai. « Ring-Shaped J-Type and Star-Shaped H-Type Nanostructures of an Unsymmetrical (Phthalocyaninato)zinc Complex ». European Journal of Inorganic Chemistry 2011, no 9 (15 février 2011) : 1466–72. http://dx.doi.org/10.1002/ejic.201001106.

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9

Pergushov, D. V., I. A. Babin, F. A. Plamper, H. Schmalz, A. H. E. Müller et A. B. Zezin. « Water-soluble complex macromolecular structures based on star-shaped poly(acrylic acid) ». Doklady Physical Chemistry 425, no 1 (mars 2009) : 57–61. http://dx.doi.org/10.1134/s0012501609030038.

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10

Cheung, Wai-Shun, et Tin-Yau Tam. « Star-Shapedness and K-Orbits in Complex Semisimple Lie Algebras ». Canadian Mathematical Bulletin 54, no 1 (1 mars 2011) : 44–55. http://dx.doi.org/10.4153/cmb-2010-097-7.

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AbstractGiven a complex semisimple Lie algebra is a compact real form of g), let be the orthogonal projection (with respect to the Killing form) onto the Cartan subalgebra , where t is a maximal abelian subalgebra of . Given x ∈ g, we consider π(Ad(K)x), where K is the analytic subgroup G corresponding to , and show that it is star-shaped. The result extends a result of Tsing. We also consider the generalized numerical range f (Ad(K)x), where f is a linear functional on g. We establish the star-shapedness of f (Ad(K)x) for simple Lie algebras of type B.
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11

Wei, Fuxiang, et Gen-Xi Yu. « Study on a star-shaped europium complex : Synthesis, photophysical properties and organoelectronic performances ». Journal of Luminescence 134 (février 2013) : 710–17. http://dx.doi.org/10.1016/j.jlumin.2012.07.005.

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12

Guan, Lu, et Zhu Chen. « Analytical Solution of the Star-Shaped Crack in One-Dimensional Hexagonal Quasicrystals ». Advanced Materials Research 838-841 (novembre 2013) : 2254–61. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2254.

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With the use of complex analysis, and by introducing adequate conformal mapping, the anti-shear problem of the star-shaped crack in One-dimensional Hexagonal Quasicrystals was studied. An analytical solution to the crack tip stress intensity factor is found.
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Dyuzhikova, Yulia S., Anton A. Anisimov, Alexander S. Peregudov, Mikhail I. Buzin, Galina G. Nikiforova, Viktor G. Vasil’ev, Sergey A. Kostrov et al. « Star-Shaped Polydimethylsiloxanes with Organocyclotetrasilsesquioxane Branching-Out Centers : Synthesis and Properties ». Polymers 14, no 2 (12 janvier 2022) : 285. http://dx.doi.org/10.3390/polym14020285.

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New non-crystallizable low-dispersity star-shaped polydimethylsiloxanes (PDMS) containing stereoregular cis-tetra(organo)(dimethylsiloxy)cyclotetrasiloxanes containing methyl-, tolyl- and phenyl-substituents at silicon atoms and the mixture of four stereoisomers of tetra[phenyl(dimethylsiloxy)]cyclotetrasiloxane as the cores were synthesized. Their thermal and viscous properties were studied. All synthesized compounds were characterized by a complex of physicochemical analysis methods: nuclear magnetic resonance (NMR), FT-IR spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), viscometry in solution, rheometry, and Langmuir trough study.
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Ibáñez, S., M. Poyatos et E. Peris. « A D3h-symmetry hexaazatriphenylene-tris-N-heterocyclic carbene ligand and its coordination to iridium and gold : preliminary catalytic studies ». Chemical Communications 53, no 26 (2017) : 3733–36. http://dx.doi.org/10.1039/c7cc00525c.

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A planar star-shaped tris-NHC ligand with a hexaazatriphenylene core was coordinated to gold and iridium. The tris–Au(i) complex shows enhanced catalytic activities due to the electron-deficient character of the HAT core.
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15

Hoogenboom, Richard, Martin W. M. Fijten, Guido Kickelbick et Ulrich S. Schubert. « Synthesis and crystal structures of multifunctional tosylates as basis for star-shaped poly(2-ethyl-2-oxazoline)s ». Beilstein Journal of Organic Chemistry 6 (9 septembre 2010) : 773–83. http://dx.doi.org/10.3762/bjoc.6.96.

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The synthesis of well-defined polymer architectures is of major importance for the development of complex functional materials. In this contribution, we discuss the synthesis of a range of multifunctional star-shaped tosylates as potential initiators for the living cationic ring-opening polymerization (CROP) of 2-oxazolines resulting in star-shaped polymers. The synthesis of the tosylates was performed by esterification of the corresponding alcohols with tosyl chloride. Recrystallization of these tosylate compounds afforded single crystals, and the X-ray crystal structures of di-, tetra- and hexa-tosylates are reported. The use of tetra- and hexa-tosylates, based on (di)pentaerythritol as initiators for the CROP of 2-ethyl-2-oxazoline, resulted in very slow initiation and ill-defined polymers, which is most likely caused by steric hindrance in these initiators. As a consequence, a porphyrin-cored tetra-tosylate initiator was prepared, which yielded a well-defined star-shaped poly(2-ethyl-2-oxazoline) by CROP as demonstrated by SEC with RI, UV and diode-array detectors, as well as by 1H NMR spectroscopy.
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16

Otsuki, Joe, Arata Imai, Katsuhiko Sato, Dong-Mei Li, Mayumi Hosoda, Masao Owa, Tetsuo Akasaka et al. « Switchable Antenna : A Star-Shaped Ruthenium/Osmium Tetranuclear Complex with Azobis(bipyridine) Bridging Ligands ». Chemistry - A European Journal 14, no 9 (17 mars 2008) : 2709–18. http://dx.doi.org/10.1002/chem.200701691.

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17

Biswas, Rituparna, Michael G. B. Drew et Ashutosh Ghosh. « Synthesis and crystal structure of a novel octa-aqua bridged star-shaped Ni4K complex ». Inorganic Chemistry Communications 24 (octobre 2012) : 1–3. http://dx.doi.org/10.1016/j.inoche.2012.07.023.

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18

Li, Dongni, Bo Gao et Qian Duan. « Preparation of star-shaped functionalized polylactides by metal porphyrin complexes as both catalysts and cocatalysts ». Journal of Porphyrins and Phthalocyanines 23, no 09 (septembre 2019) : 1020–27. http://dx.doi.org/10.1142/s1088424619500603.

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Several aluminum porphyrin complexes as catalysts and a copper porphyrin complex as a cocatalyst were prepared. These complexes were characterized by 1H NMR and elemental analysis. These complexes are used for L-lactide polymerization. The kinetic data of the polymerization using complex 2 as catalyst revealed that the polymeric rates were first-ordered in both the monomer and catalyst. There is a linear relationship between lactide conversion and the number-averaged molecular weight of PLA.
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19

JIN, REN-HUA, et KOU-ICHI MOTOYOSHI. « Porphyrin-centered Water-soluble Star-shaped Polymers : Poly(N-acetylethylenimine) and Poly(ethylenimine) Arms ». Journal of Porphyrins and Phthalocyanines 03, no 01 (janvier 1999) : 60–64. http://dx.doi.org/10.1002/(sici)1099-1409(199901)3:1<60 ::aid-jpp104>3.0.co;2-g.

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Porphyrin-centered star-shaped polymers were synthesized through living cationic ring-opening polymerization of 2-methyl-2-oxazoline employing tetra(p-chloromethylphenyl)porphyrin (CMPP) and its zinc complex as initiators. The polymers were characterized by GPC, 1 H NMR and UV-vis and their properties were examined by fluorescence quenching.
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20

Vives, Guillaume, Alexandre Carella, Jean-Pierre Launay et Gw?na?l Rapenne. « A star-shaped ruthenium complex with five ferrocenyl-terminated arms bridged by trans-platinum fragments ». Chemical Communications, no 21 (2006) : 2283. http://dx.doi.org/10.1039/b603508f.

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21

Romero Ávila, Margarita, Andrés Felipe León-Rojas, Pascal G. Lacroix, Isabelle Malfant, Norberto Farfán, Rana Mhanna, Rosa Santillan, Gabriel Ramos-Ortiz et Jean-Pierre Malval. « Two-Photon-Triggered NO Release via a Ruthenium–Nitrosyl Complex with a Star-Shaped Architecture ». Journal of Physical Chemistry Letters 11, no 16 (22 juillet 2020) : 6487–91. http://dx.doi.org/10.1021/acs.jpclett.0c01953.

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22

Deng, Yun, Shu-Juan Liu, Bao-Min Zhao, Pei Wang, Qu-Li Fan, Wei Huang et Lian-Hui Wang. « Synthesis and characterization of one star-shaped polymer with charged iridium complex as luminescent core ». Journal of Luminescence 131, no 10 (octobre 2011) : 2166–73. http://dx.doi.org/10.1016/j.jlumin.2011.05.021.

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23

Hoogenboom, Richard, Brian C. Moore et Ulrich S. Schubert. « Supramolecular Star-Shaped Poly(ethylene glycol) Based on a [2 × 2] Grid-Like Metal Complex ». Macromolecular Rapid Communications 31, no 9-10 (4 mars 2010) : 840–45. http://dx.doi.org/10.1002/marc.200900834.

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24

Salehin, Rofiques, Rong-Guang Xu et Stefanos Papanikolaou. « Colloidal Shear-Thickening Fluids Using Variable Functional Star-Shaped Particles : A Molecular Dynamics Study ». Materials 14, no 22 (14 novembre 2021) : 6867. http://dx.doi.org/10.3390/ma14226867.

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Complex colloidal fluids, depending on constituent shapes and packing fractions, may have a wide range of shear-thinning and/or shear-thickening behaviors. An interesting way to transition between different types of such behavior is by infusing complex functional particles that can be manufactured using modern techniques such as 3D printing. In this paper, we perform 2D molecular dynamics simulations of such fluids with infused star-shaped functional particles, with a variable leg length and number of legs, as they are infused in a non-interacting fluid. We vary the packing fraction (ϕ) of the system, and for each different system, we apply shear at various strain rates, turning the fluid into a shear-thickened fluid and then, in jammed state, rising the apparent viscosity of the fluid and incipient stresses. We demonstrate the dependence of viscosity on the functional particles’ packing fraction and we show the role of shape and design dependence of the functional particles towards the transition to a shear-thickening fluid.
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Plyuta, Nataliya, Olga Yu Vassilyeva, Vladimir N. Kokozay, Iryna Omelchenko et Svitlana Petrusenko. « A binuclear CuII/CaII thiocyanate complex with a Schiff base ligand derived from o-vanillin and ammonia ». Acta Crystallographica Section E Crystallographic Communications 76, no 3 (21 février 2020) : 423–26. http://dx.doi.org/10.1107/s205698902000211x.

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The new heterometallic complex, aqua-1κO-bis(μ2-2-iminomethyl-6-methoxyphenolato-1κ2 O 1,O 6:2κ2 O 1,N)bis(thiocyanato-1κN)calcium(II)copper(II), [CaCu(C8H8NO2)2(NCS)2(H2O)], has been synthesized using a one-pot reaction of copper powder, calcium oxide, o-vanillin and ammonium thiocyanate in methanol under ambient conditions. The Schiff base ligand (C8H9NO2) is generated in situ from the condensation of o-vanillin and ammonia, which is released from the initial NH4SCN. The title compound consists of a discrete binuclear molecule with a {Cu(μ-O)2Ca} core, in which the Cu...Ca distance is 3.4275 (6) Å. The coordination geometries of the four-coordinate copper atom in the [CuN2O2] chromophore and the seven-coordinate calcium atom in the [CaO5N2] chromophore can be described as distorted square planar and pentagonal bipyramidal, respectively. In the crystal, O—H...S hydrogen bonds between the coordinating water molecules and thiocyanate groups form a supramolecular chain with a zigzag-shaped calcium skeleton.
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Wang, Xu, et L. J. Sudak. « Interaction of a Screw Dislocation With an Arbitrary Shaped Elastic Inhomogeneity ». Journal of Applied Mechanics 73, no 2 (17 mai 2005) : 206–11. http://dx.doi.org/10.1115/1.2073307.

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In this paper, the interaction between a screw dislocation and an arbitrary shaped elastic inhomogeneity with different material properties than the surrounding matrix is investigated. The exact solution to this problem is derived by means of complex variable methods and Faber series expansion. Specifically, the conformal mapping function maps the matrix region surrounding the inhomogeneity onto the outside of a unit circle in the image plane, while the analytic function defined in the elastic inhomogeneity is expressed in terms of a Faber series expansion. Once the series form solution is obtained, the stress fields due to the screw dislocation can be obtained. Also the image force on the screw dislocation due to its interaction with the elastic inhomogeneity is derived. Three examples of a screw dislocation interacting with (1) an equilateral triangular inhomogeneity, (2) a square inhomogeneity, and (3) a five-pointed star-shaped inhomogeneity are presented to illustrate how the stiffness of the triangular, square or five-pointed star-shaped inhomogeneity can influence the mobility of the screw dislocation.
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Znojil, Miloslav. « Quantum star-graph analogues of PT -symmetric square wells : Part II, spectra ». Canadian Journal of Physics 93, no 7 (juillet 2015) : 765–68. http://dx.doi.org/10.1139/cjp-2014-0475.

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For the non-Hermitian equilateral q-pointed star-shaped quantum graphs of our previous paper (Can. J. Phys. 90, 1287 (2012) doi:10.1139/p2012-107 ) we show that because of certain dynamical aspects of the model as controlled by the external, rotation-symmetric complex Robin boundary conditions, the spectrum is obtainable in a closed asymptotic-expansion form, in principle at least. Explicit formulae up to the second order are derived for illustration, and a few comments on their consequences are added.
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Kuepper, Karsten, Christian Taubitz, Daniel Taubitz, Ulf Wiedwald, Andreas Scheurer, Stefan Sperner, Rolf W. Saalfrank et al. « Magnetic Ground-State and Systematic X-ray Photoreduction Studies of an Iron-Based Star-Shaped Complex ». Journal of Physical Chemistry Letters 2, no 13 (2 juin 2011) : 1491–96. http://dx.doi.org/10.1021/jz2005013.

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Bernini, Maria Celeste, Natalia Snejko, Enrique Gutierrez-Puebla et Angeles Monge. « From globular star-shaped molecules to self-assembled nano-spheres : a novel scandium croconate polynuclear complex ». CrystEngComm 13, no 6 (2011) : 1797. http://dx.doi.org/10.1039/c0ce00649a.

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Onwudiwe, Damian C., Opeyemi A. Oyewo, Ufuk Atamtürk, Olusola Ojelere et Sanjay Mathur. « Photocatalytic reduction of Cr(VI) using star-shaped Bi2S3 obtained from microwave irradiation of bismuth complex ». Journal of Environmental Chemical Engineering 8, no 4 (août 2020) : 103816. http://dx.doi.org/10.1016/j.jece.2020.103816.

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Sato, Hisako, Yuka Furuno, Yutaka Fukuda, Kentaro Okamoto et Akihiko Yamagishi. « Crystallization induced chiral locking of a central labile core in a star-shaped tetra-nuclear complex ». Dalton Transactions, no 10 (2008) : 1283. http://dx.doi.org/10.1039/b717429b.

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Panja, Alik, Yan Sun, Wen Ping Chen et Soumen Mondal. « Star and Cluster Formation in the Sh2-112 Filamentary Cloud Complex ». Astrophysical Journal 939, no 1 (1 novembre 2022) : 46. http://dx.doi.org/10.3847/1538-4357/ac940f.

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Abstract We present the star formation activity around the emission nebula Sh2-112. At a distance of ∼2.1 kpc, this H ii complex, itself 3 pc in radius, is illuminated by the massive star (O8 V) BD+45 3216. The associated molecular cloud extends in angular scales of 2.°0 × 0.°83, corresponding to linear sizes of 73 pc by 30 pc, along the Galactic longitude. The high-resolution (30″) extinction map reveals a chain of dust clumps aligned with the filament-like structure with an average extinction of A V ∼ 2.78 mag, varying up to a maximum of ∼17 mag. Our analysis led to identification of a rich population (∼500) of young (average age of ∼1 Myr) stars, plus a numerous number (∼350) of Hα emitters, spatially correlated with the filamentary clouds. Located near the edge of the cloud, the luminous star BD+45 3216 has created an arc-like pattern as the ionizing radiation encounters the dense gas, forming a blister-shaped morphology. We found three distinct young stellar groups, all coincident with relatively dense parts of the cloud complex, signifying ongoing star formation. Moreover, the cloud filament (excitation temperature ∼10 K) traced by the CO isotopologues and extending nearly ∼80 pc is devoid of ionized gas except at the dense cores (excitation temperature ∼28–32 K) wherein significant ionized emission excited by OB stars (dynamical age ∼0.18–1.0 Myr) pertains. The radial velocity is dynamic (median ∼−3.65 km s−1) along the main filament, increasing from Galactic east to west, indicating mass flow to form the massive stars/clusters at the central hubs.
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Tateyama, S., K. Uchida, T. Hidaka, M. Hirao et R. Yamaguchi. « Expression of Bone Morphogenetic Protein-6 (BMP-6) in Myoepithelial Cells in Canine Mammary Gland Tumors ». Veterinary Pathology 38, no 6 (novembre 2001) : 703–9. http://dx.doi.org/10.1354/vp.38-6-703.

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Seventy-three mammary tumors and three mammary tissue specimens were examined to elucidate the expression of bone morphogenetic protein (BMP)-6 in the myoepithelial cells of canine mammary gland tumors. Morphologically, the myoepithelial cells were classified into four types: resting and proliferating cells inside the basement membrane, and spindle- and star-shaped cells proliferating in the outer area of the basement membrane. The characteristics of these myoepithelial cells were confirmed by immunohistochemistry using antibodies raised against keratin, cytokeratin 19, alpha-smooth muscle actin, and vimentin. In simple adenoma, a small number of resting myoepithelial cells was immunopositive for BMP-6. In complex adenomas and benign mixed tumors, all types of myoepithelial cells, depending in some cases on their specific location within the tumor, were immunopositive for BMP-6, but almost all of the tubular epithelial cells were immunonegative. Foci consisting of a proliferation of BMP-6–positive star- and spindle-shaped cells had mucinous stroma with marked hyaline and chondroid changes. In contrast, the foci with BMP-6–negative spindle- and star-shaped cells tended to have mucinous stroma without chondroid change. Several types of mesenchymal cells including chondrocytes, osteoblasts, and fibroblastlike cells in the mixed tumors, showed an intense immunopositive reaction for the BMP-6 antibody, and were located close to the ectopic cartilage and bone matrix. No significant immunoreactivity for BMP-6 was observed in most of the malignant mammary tumors; only one malignant mixed tumor was examined. All of these findings indicate that BMP-6 expression in myoepithelial cells may increase in complex adenomas and benign mixed tumors in canine mammary glands, and that BMP-6 expression is most intense in the vicinity of chondroid matrix in these tumors.
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Yang, Xinlong, Zhen Wang, Yifeng Zhong et Rong Liu. « Investigating the Effective Performance of Sandwich Panel with Petal Star-Triangular Core Using VAM-Based Equivalent Model ». Materials 15, no 18 (15 septembre 2022) : 6407. http://dx.doi.org/10.3390/ma15186407.

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On the basis of star-shaped core sandwich panel, a novel sandwich panel with petal-triangle core (SP-PSC) was proposed to improve the negative Poisson’s ratio (NPR) effect while retaining the characteristics of light weight and high strength. To study the complex structure more conveniently and quickly, a variational asymptotic method-based equivalent two-dimensional model (2D-EPM) was developed. The accuracy and efficiency of 2D-EPM were verified by the three-point bending experiment data and the 3D FE model results under different boundary and load conditions. The effects of the geometric parameters on the equivalent stiffness, buckling, natural frequency and NPR effect were also investigated. To increase the NPR of SP-PSC, the material of facesheet was changed from isotropic material to unidirectional CFPR material, and the influence of the material anisotropy on the NPR effect of SP-PSC was investigated. It is found that the NPR of SP-PSC increased first and then decreased with the increase in the fiber angle, reaching the maximum value at 40–50∘. At the same time, this law is applicable to SP-PSC with different material or geometric parameters. Finally, two improved cores, petal star-triangular core with X-shaped ligaments (PSC-X) and double-arc star-shaped core (DSC), were proposed and compared with SP-PSC in equivalent stiffness and recovered local fields to demonstrate their advantages. Compared with the original plate, the stress concentration and equivalent stiffness of the two improved PSCs significantly improved.
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Hojaev, Alisher, et Alexander Zheleznyak. « A Study of the Young Star V1331 CYG in a Compact Star-Forming Region ». Highlights of Astronomy 11, no 1 (1998) : 344. http://dx.doi.org/10.1017/s1539299600020955.

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The peculiar T Tauri type star V1331 Cyg = LkH 120, located in the dark cloud Lynds 984, is a FU Orionis pre-outburst candidate (McMuldroch et al., 1993). This star embedded in circumstellar bright nebulosity is also surrounded by a helix-shaped nebula originated from the star. We obtained a series of speckle images of V1331 Cyg on the standard VBR system on July 18-20, 1994 using the Zeiss 1000 1.0 m telescope of the High Altitude Maydanak Observatory in Uzbekistan. We also used the results of Johnson’s system photometry of V1331 Cyg, made simultaneously at Maydanak Observatory with a 0.6 m reflector. Images were computer processed. Surface photometry of the star and surrounding nebula was made and isophotes were constructed. Fourier analysis of light curves for V1331 Cyg has shown 36.2 day periodic process (Melnikov, priv. comm.) which could be due to the presence of a circumstellar disk. Morphologic analysis revealed a complex fine structure of nebula, consisting of many bright knots and obviously show a jet-like outflow. According to spectral observations (Chavarria K. 1981; Penston & Keavey 1977) the line profiles of V1331 Cyg are P Cyg type only; there are no detections of anti-P Cyg profiles during the last 25 years observations. This indicates a stable mass loss (on average, 10−7M⊙/yr) with mean velocities about −410 km/s.
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36

Ðoković, Dragomir Ž., et Tin-Yau Tam. « Some Questions about Semisimple Lie Groups Originating in Matrix Theory ». Canadian Mathematical Bulletin 46, no 3 (1 septembre 2003) : 332–43. http://dx.doi.org/10.4153/cmb-2003-035-1.

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AbstractWe generalize the well-known result that a square traceless complex matrix is unitarily similar to a matrix with zero diagonal to arbitrary connected semisimple complex Lie groups G and their Lie algebras under the action of a maximal compact subgroup K of G. We also introduce a natural partial order on : x ≤ y if f (K · x) ⊆ f (K · y) for all f 2 *, the complex dual of . This partial order is K-invariant and induces a partial order on the orbit space /K. We prove that, under some restrictions on , the set f (K · x) is star-shaped with respect to the origin.
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37

Richter, Wolf-Dieter. « Deterministic and Random Generalized Complex Numbers Related to a Class of Positive Homogeneous Functionals ». Axioms 12, no 1 (4 janvier 2023) : 60. http://dx.doi.org/10.3390/axioms12010060.

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Based upon a new general vector-valued vector product, generalized complex numbers with respect to certain positively homogeneous functionals including norms and antinorms are introduced and a vector-valued Euler type formula for them is derived using a vector valued exponential function. Furthermore, generalized Cauchy–Riemann differential equations for generalized complex differentiable functions are derived. For random versions of the considered new type of generalized complex numbers, moments are introduced and uniform distributions on discs with respect to functionals of the considered type are analyzed. Moreover, generalized uniform distributions on corresponding circles are studied and a connection with generalized circle numbers, which are natural relatives of π, is established. Finally, random generalized complex numbers are considered which are star- shaped distributed.
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38

GOU, Peng-fei, Wei-pu ZHU et Zhi-quan SHEN. « SYNTHESIS AND CHARACTERIZATION OF CALIXARENE-BASED STAR SHAPED POLY(ε-CAPROLACTONE)S CATALYZED BY YTTRIUM COMPLEX ». Acta Polymerica Sinica 007, no 10 (11 décembre 2009) : 967–73. http://dx.doi.org/10.3724/sp.j.1105.2007.00967.

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39

Patel, Jayesh D., Frej Mighri et Abdellah Ajji. « Aminocaproic acid mixed methanolic lead–thiourea complex precursor and its thermal decomposition to star-shaped lead sulfide crystals ». Materials Letters 74 (mai 2012) : 183–86. http://dx.doi.org/10.1016/j.matlet.2012.01.089.

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40

Kompan, M. E., I. G. Aksyanov et A. V. Ten’kovtsev. « Luminescence spectra of a supramolecular complex of uranyl and a star-shaped polymer based on calix[8]arene ». Physics of the Solid State 52, no 2 (février 2010) : 419–21. http://dx.doi.org/10.1134/s1063783410020319.

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41

Huang, Junchao, Xu Li, Tintin Lin, Chaobin He, Khine Yi Mya, Yang Xiao et Jun Li. « Inclusion complex formation between ?,?-cyclodextrins and organic-inorganic star-shaped poly(ethylene glycol) from an octafunctional silsesquioxane core ». Journal of Polymer Science Part B : Polymer Physics 42, no 7 (2004) : 1173–80. http://dx.doi.org/10.1002/polb.10785.

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42

Reddig, Nicole, Michael U. Triller, Daniel Pursche, Annette Rompel et Bernt Krebs. « A Tetranuclear Manganese Cluster with a Star-Shaped Mn4O6 Core Motif : Directed Synthesis using a Mononuclear Precursor Complex ». Zeitschrift für anorganische und allgemeine Chemie 628, no 11 (novembre 2002) : 2458–62. http://dx.doi.org/10.1002/1521-3749(200211)628:11<2458 ::aid-zaac2458>3.0.co;2-6.

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43

Dullemond, C. P., M. Küffmeier, F. Goicovic, M. Fukagawa, V. Oehl et M. Kramer. « Cloudlet capture by transitional disk and FU Orionis stars ». Astronomy & ; Astrophysics 628 (29 juillet 2019) : A20. http://dx.doi.org/10.1051/0004-6361/201832632.

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After its formation, a young star spends some time traversing the molecular cloud complex in which it was born. It is therefore not unlikely that, well after the initial cloud collapse event which produced the star, it will encounter one or more low mass cloud fragments, which we call “cloudlets” to distinguish them from full-fledged molecular clouds. Some of this cloudlet material may accrete onto the star+disk system, while other material may fly by in a hyperbolic orbit. In contrast to the original cloud collapse event, this process will be a “cloudlet flyby” and/or “cloudlet capture” event: A Bondi–Hoyle–Lyttleton type accretion event, driven by the relative velocity between the star and the cloudlet. As we will show in this paper, if the cloudlet is small enough and has an impact parameter similar or less than GM*/v∞2 (with v∞ being the approach velocity), such a flyby and/or capture event would lead to arc-shaped or tail-shaped reflection nebulosity near the star. Those shapes of reflection nebulosity can be seen around several transitional disks and FU Orionis stars. Although the masses in the those arcs appears to be much less than the disk masses in these sources, we speculate that higher-mass cloudlet capture events may also happen occasionally. If so, they may lead to the tilting of the outer disk, because the newly infalling matter will have an angular momentum orientation entirely unrelated to that of the disk. This may be one possible explanation for the highly warped/tilted inner/outer disk geometries found in several transitional disks. We also speculate that such events, if massive enough, may lead to FU Orionis outbursts.
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44

CUMMINGS, PETER, et XIAOBING FENG. « SHARP REGULARITY COEFFICIENT ESTIMATES FOR COMPLEX-VALUED ACOUSTIC AND ELASTIC HELMHOLTZ EQUATIONS ». Mathematical Models and Methods in Applied Sciences 16, no 01 (janvier 2006) : 139–60. http://dx.doi.org/10.1142/s021820250600108x.

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We consider complex-valued acoustic and elastic Helmholtz equations with the first order absorbing boundary condition in a star-shaped domain in ℜN for N ≥ 2. It is known that the elliptic regularity coefficients depend on the frequency ω, and have singularities for both zero and infinite frequency. In this paper, we obtain sharp estimates for the coefficients with respect to large frequencies. It is proved that the elliptic regularity coefficients are bounded by first or second order polynomials in ω for large ω. The crux of our analysis is to establish and make use of Rellich identities for the solutions to the acoustic and elastic Helmholtz equations. Our results improve the earlier estimates of Refs. 10 and 11, which were carried out based on layer potential representations of the solutions of the Helmholtz equations.
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45

Rowell, D. M. « Chromosomal fusion and meiotic behaviour in Delena cancerides (Araneae : Sparassidae). I. Chromosome pairing and X-chromosome segregation ». Genome 34, no 4 (1 août 1991) : 561–66. http://dx.doi.org/10.1139/g91-086.

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Surface spreading of meiotic material in Delena cancerides indicates that pairing initiation among metacentric chromosomes with monobrachial homology differs from that of telocentric forms and free metacentric bivalents and results in a star-shaped structure at pachytene. Distance cosegregation of the three X chromosomes in ancestral, telocentric forms is prefaced by a centric association early in prophase I. This centric association of the X chromosomes is conserved in metacentric races despite the presence of an X-autosome fusion.Key words: synaptonemal complex, translocation heterozygote, X chromosome, spider.
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46

Yuan, Jie, Zhilong Jiang, Die Liu, Yiming Li et Pingshan Wang. « Synthesis and photophysical properties of multi-Ru2+ terpyridine complexes : from di-nuclear linear to star-shaped hexa-nuclear architectures ». Inorganic Chemistry Frontiers 3, no 2 (2016) : 268–73. http://dx.doi.org/10.1039/c5qi00181a.

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Polyterpyridinyl multi-nuclear Ru2+ complex was synthesized through a heterocomplexation method. Introducing the tailed aliphatic chain greatly enhanced the solubility of multi-ionic paired complexes, which illustrated the photophysical and electrochemical structural differentiations.
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47

Fleischmann, Carolin, Hendrik Wöhlk et Helmut Ritter. « End group functionalization of poly(ethylene glycol) with phenolphthalein : towards star-shaped polymers based on supramolecular interactions ». Beilstein Journal of Organic Chemistry 10 (25 septembre 2014) : 2263–69. http://dx.doi.org/10.3762/bjoc.10.235.

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The synthesis of a new phenolphthalein azide derivative, which can be easily utilized in polymer analogous reactions, is presented. The subsequent cycloaddition reaction with propargyl-functionalized methoxypoly(ethylene glycol) yielded polymers bearing phenolphthalein as the covalently attached end group. In presence of per-β-cyclodextrin-dipentaerythritol, the formation of stable inclusion complexes was observed, representing an interesting approach towards the formation of star shaped polymers. The decolorization of a basic polymer solution caused by the complexation was of great advantage since this behavior enabled following the complex formation by UV–vis spectroscopy and even the naked eye.
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48

Wu, Xufeng, James E. Collins, John E. McAlvin, Russell W. Cutts et Cassandra L. Fraser. « Ruthenium Tris(bipyridine)-Centered Linear and Star-Shaped Polystyrenes : Making Atom Transfer Radical Polymerization and Metal Complex Initiators Compatible ». Macromolecules 34, no 9 (avril 2001) : 2812–21. http://dx.doi.org/10.1021/ma001745s.

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49

WÖRHEIDE, GERT, EMILIE KALTENBACHER, ZARA-LOUISE COWAN et GERHARD HASZPRUNAR. « A new species of crown-of-thorns sea star, Acanthaster benziei sp. nov. (Valvatida : Acanthasteridae), from the Red Sea ». Zootaxa 5209, no 3 (17 novembre 2022) : 379–93. http://dx.doi.org/10.11646/zootaxa.5209.3.7.

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A new species of crown-of-thorns sea star (CoTS), Acanthaster benziei sp. nov., is described based on four specimens collected from Saudi Arabia’s Red Sea coast where it inhabits coral reefs. Species delimitation from congeners in the species complex, i.e., Acanthaster planci, Acanthaster mauritiensis and Acanthaster cf. solaris, is primarily based on distinct and diagnostic mitochondrial DNA sequence regions. Species separation of Acanthaster benziei is additionally justified due to diagnostic morphological characters: fewer arms; narrower and thinner spines; fanned spine tips in primary and latero-oral spines; a wider tip or tapering shape in circumoral spines; and rhombus-shaped oral pedicellariae.
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de Campo, Liliana, Toen Castle et Stephen T. Hyde. « Optimal packings of three-arm star polyphiles : from tricontinuous to quasi-uniformly striped bicontinuous forms ». Interface Focus 7, no 4 (16 juin 2017) : 20160130. http://dx.doi.org/10.1098/rsfs.2016.0130.

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Star-shaped molecules with three mutually immiscible arms self-assemble to form a variety of novel structures, with conformations that attempt to minimize interfacial area between the domains composed of the different arms. The geometric frustration caused by the joining of these arms at a common centre limits the size and shape of each domain, encouraging the creation of complex and interesting solutions. Some solutions are tricontinuous, and these solutions (and others) share aspects of bicontinuous structures with amphiphilic assemblies as similar molecular segregation factors are at work. We describe both highly symmetric and balanced structures, as well as unbalanced solutions that take the form of intricately striped amphiphilic membranes. All these patterns can result in chiral assemblies with multiple networks.
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