40 research outputs found
Crystallography Reports V. 46, I. 05
No full textCrystallography Reports -- September 2001
Volume 46, Issue 5, pp. 701-885
DIFFRACTION AND SCATTERING OF X-RAY AND SYNCHROTRON RADIATION
Beam Focusing on Stations with a Sibir'-2 Synchrotron Source for Single-Crystal Studies of Atomic Structures
D. M. Kheiker, V. A. Shishkov, M. E. Andriyanova, and D. V. Smagin
pp. 701-706 Full Text: PDF (448 kB)
Structure of the Interfaces of the InxGa1 – xAs Quantum Well from X-ray Diffraction Data
A. M. Afanas'ev, M. A. Chuev, R. M. Imamov, and A. A. Lomov
pp. 707-716 Full Text: PDF (119 kB)
Triple-Crystal X-ray Spectroscopy of Diffuse Scattering from Tracks
V. N. Peregudov and E. M. Pashaev
pp. 717-721 Full Text: PDF (69 kB)
DIFFRACTION AND SCATTERING OF ELECTRONS
Size Effect in X-ray and Electron Diffraction Patterns from Hydroxyapatite Particles
E. I. Suvorova and P.-A. Buffat
pp. 722-729 Full Text: PDF (1290 kB)
STRUCTURE OF INORGANIC COMPOUNDS
Crystal Structure of Lepidocrocite FeO(OH) from the Electron-Diffractometry Data
A. P. Zhukhlistov
pp. 730-733 Full Text: PDF (56 kB)
Atomic Structure of Boron Suboxycarbide B(C,O)0.155
N. B. Bolotina, T. I. Dyuzheva, and N. A. Bendeliani
pp. 734-740 Full Text: PDF (75 kB)
Synthesis and X-ray Diffraction Study of K2.92Nb2.58Ti1.42P2.5O17 Single Crystals
O. A. Alekseeva, N. I. Sorokina, I. A. Verin, T. Yu. Losevskaya, V. I. Voronkova, V. K. Yanovskii, and V. I. Simonov
pp. 741-747 Full Text: PDF (254 kB)
Low-Temperature Structural Variations and Interlayer Charge Transfer in Cuprate Superconductors
S. Sh. Shil'shtein, I. P. Makarova, and V. N. Molchanov
pp. 748-751 Full Text: PDF (55 kB)
Modular Structure of a Sodium-Rich Analogue of Eudialyte with the Doubled c-Parameter and the R3 Symmetry
R. K. Rastsvetaeva and A. P. Khomyakov
pp. 752-757 Full Text: PDF (74 kB)
STRUCTURES OF COORDINATION COMPOUNDS
X-ray Diffraction Study of Phase Transitions in Iron(II) Trisnioximate Hexadecylboronate Clathrochelate Complex
I. I. Vorontsov, K. A. Potekhin, M. Yu. Antipin, Ya. Z. Voloshin, A. I. Stash, V. K. Belsky, I. I. Dubovik, and V. S. Papkov
pp. 758-770 Full Text: PDF (271 kB)
Effect of the Acid–Base Interactions in a Solution on the Composition of the Coordination Sphere of Aluminum and Gallium Complexonates
A. B. Ilyukhin and S. P. Petrosyants
pp. 771-778 Full Text: PDF (108 kB)
Crystal Structure and Thermochromism of Bisguanidinium Tetrachlorocuprate Dihydrate at 123 and 293 K
V. K. Belsky, V. Fernandez, V. E. Zavodnik, I. Diaz, and J. L. Martinez
pp. 779-785 Full Text: PDF (88 kB)
STRUCTURE OF ORGANIC COMPOUNDS
Molecular and Crystal Structures of 1R,4S-2-(4-Carbomethoxy)benzylidene-n-Menthan-3-one
S. V. Shishkina, T. G. Drushlyak, L. A. Kutulya, O. V. Shishkin, and J. W. Goodby
pp. 786-791 Full Text: PDF (87 kB)
STRUCTURES OF MACROMOLECULAR COMPOUNDS
Topology of the Polypeptide Chain in the Complex of Agglutinin from Castor Bean Seeds with beta-D-Galactose in the Crystalline State
N. V. Konareva, A. G. Gabdulkhakov, S. Eschenburg, S. Stoeva, A. N. Popov, R. Krauspenhaar, M. E. Andrianova, Yu. Savochkina, I. I. Agapov, A. G. Tonevitskii, A. N. Kornev, V. V. Kornilov, V. N. Zaitsev, W. Voelter, Ch. Betzel, S. V. Nikonov, B. K. Vainshtein[dagger], and A. M. Mikhailov
pp. 792-800 Full Text: PDF (566 kB)
CRYSTAL CHEMISTRY
Crystal Chemistry of Li,GeVI-Germanates: Combinatorial–Topological Analysis and Modeling of Crystal Structures
G. D. Ilyushin and L. N. Demianets
pp. 801-809 Full Text: PDF (156 kB)
STRUCTURE OF REAL CRYSTALS
Dislocations in BZS and PMN Pyrochlores
A. Mergen
pp. 810-812 Full Text: PDF (170 kB)
PHYSICAL PROPERTIES OF CRYSTALS
Properties of Nonlinear Elastic Waves Propagating along Acoustic Axes
A. L. Shuvalov and A. Radowicz
pp. 813-819 Full Text: PDF (90 kB)
Mechanical Properties of Organic Alkali Metal and Ammonium Hydrophthalate Single Crystals
V. R. Regel, N. L. Sizova, G. S. Belikova, and T. N. Turskaya
pp. 820-825 Full Text: PDF (394 kB)
Absorption Spectra and Circular Dichroism of Sr3Ga2Ge2O14 : Cr and Ca3Ga2Ge2O14 : Cr Crystals
Z. B. Perekalina, V. P. Orekhova, K. A. Kaldybaev, B. V. Mill, and D. V. Isakov
pp. 826-829 Full Text: PDF (59 kB)
Growth Conditions and Electric Properties of KDP Crystals. I. Conductivity Measurements
E. D. Yakushkin, E. P. Efremova, and A. I. Baranov
pp. 830-834 Full Text: PDF (60 kB)
Analytical Description of the Yield Drop in the Alexander–Haasen Model
B. V. Petukhov
pp. 835-841 Full Text: PDF (103 kB)
Dispersionless Polaritons on a Twist Boundary in Optically Uniaxial Crystals
A. N. Darinskii
pp. 842-844 Full Text: PDF (50 kB)
Low-Frequency Dielectric Properties of DMAAS Crystals in the Vicinity of 110 K
A. M. Lotonov, L. F. Kirpichnikova, and N. D. Gavrilova
pp. 845-847 Full Text: PDF (49 kB)
THIN FILMS
Epitaxial (001) Fe Films with Unidirectional Anisotropy
A. A. Potseluiko and V. G. Pyn'ko
pp. 848-849 Full Text: PDF (77 kB)
SURFACE
Structure of the Polar (010) Cleavage of a Ferroelectric TGS Crystal from the Atomic–Force Microscopy Data
N. V. Belugina and A. L. Tolstikhina
pp. 850-855 Full Text: PDF (291 kB)
Compaction of Adsorbed Alkali Metal Submonolayers on the {111} and {0001} Surfaces of Metal Crystals
V. F. Dvoryankin and G. G. Dvoryankina
pp. 856-859 Full Text: PDF (46 kB)
CRYSTAL GROWTH
Dependence of the Step Velocity on Its Length on the (010) Face of the Orthorhombic Lysozyme Crystal
L. N. Rashkovich, N. V. Gvozdev, M. I. Sil'nikova, I. V. Yaminskii, and A. A. Chernov
pp. 860-863 Full Text: PDF (218 kB)
Growth and Ionic Conductivity of gamma-Li3PO4
A. K. Ivanov-Shitz, V. V. Kireev, O. K. Mel'nikov, and L. N. Demianets
pp. 864-867 Full Text: PDF (64 kB)
Electron Microscopy of Epitaxial Structures of Pseudobinary AIIIBV Solid Solutions and the Model of Nonequilibrium Ordering in Epitaxial Growth
S. K. Maksimov and K. S. Maksimov
pp. 868-875 Full Text: PDF (199 kB)
CRYSTALLOGRAPHIC SOFTWARE
MINCRYST: a Crystallographic Database for Minerals, Local and Network (WWW) Versions
A. V. Chichagov, D. A. Varlamov, R. A. Dilanyan, T. N. Dokina, N. A. Drozhzhina, O. L. Samokhvalova, and T. V. Ushakovskaya
pp. 876-879 Full Text: PDF (40 kB)
Data Collection in Single-Crystal Diffractometry Equipped with a Zero-Dimensional Detector: Planning and Optimization
Yu. V. Nekrasov
pp. 880-882 Full Text: PDF (39 kB)
JUBILEES
Boris Borisovich Zvyagin (on the Occasion of His 80th Birthday)
pp. 883-884 Full Text: PDF (64 kB)
REVIEWS
Review of Physics of Condensed Media, volume 5 of the Encyclopedia of Modern Natural Sciences in 10 volumes. Moscow, MAGISTR PRESS, 2000 (288 pp.)
p. 885 Full Text: PDF (9 kB)Archived web conten
Testing approaches for global optimization of space trajectories
Get PDFIn this paper the procedures to test global search algorithms applied to
space trajectory design problems are discussed. Furthermore, a number
of performance indexes that can be used to evaluate the effectiveness of
the tested algorithms are presented. The performance indexes are then
compared and the actual significance of each one of them is highlighted.
Three global optimization algorithms are tested on three typical space
trajectory design problems
On testing global optimization algorithms for space trajectory design
Get PDFIn this paper we discuss the procedures to test a global search algorithm applied to a space trajectory design problem. Then, we present some performance indexes that can be used to evaluate the effectiveness of global optimization algorithms. The performance indexes are then compared highlighting the actual significance of each one of them. A number of global optimization algorithms are tested on four typical space trajectory design problems. From the results of the proposed testing procedure we infer for each pair algorithm-problem the relation between the heuristics implemented in the solution algorithm and the main characteristics of the problem under investigation. From this analysis we derive a novel interpretation of some evolutionary heuristics, based on dynamical system theory and we significantly improve the performance of one of the tested algorithms
АНАЛИЗ КОРРЕЛЯЦИИ МЕЖДУ ПОКАЗАТЕЛЯМИ ФУНКЦИОНАЛЬНОГО СОСТОЯНИЯ ЭНДОКРИННЫХ ЭЛЕМЕНТОВ ГИПОТАЛАМО-ГИПОФИЗАРНОЙ СИСТЕМЫ ПРИ ОСТРОПРОГРЕССИРУЮЩЕМ ТУБЕРКУЛЕЗЕ
No full textThe correlation between the functional state of the neurocytes of hypothalamic nuclei and pituitary adenocytes was calculated. There was a change in the correlation towards an increase or a decrease, which was accompanied by the change in its direction. These changes were a manifestation of the body’s adaptation to new living conditions, i.e. disease. They reflect the stimulating effect of regulatory centers on the respective organs and systems, the immune system in particular. Morphofunctional discoordination in the relationships within the hypothalamic-pituitary system may be regarded as a component of the pathogenesis of tuberculosis.Вычислена корреляция между средним объемом кариона нейроцитов гипоталамических ядер и аденоцитов гипофиза. Обнаружено изменение корреляции как в сторону усиления, так и в сторону ослабления, что сопровождается изменением ее направленности. Данные изменения представляют собой проявление адаптации организма к новым условиям существования, т. е. к болезни. Они отражают стимулирующее воздействие регуляторных центров на соответствующие органы и системы, в частности на иммунную систему. Морфофункциональная дискоординация во взаимосвязях внутри гипоталамо-гипофизарной системы может быть расценена в качестве составной части патогенеза туберкулеза
ChemInform Abstract: Spatially Extended Polyorganosiloxanes. Feasibilities of Molecular Formation in Highly Functionalized Systems
No full textThree-dimensionally growing polyorganosiloxanes. Possibilities of molecular construction in highly functional systems
No full textOn testing global optimization algorithms for space trajectory design
Get PDFIn this paper we discuss the procedures to test a global search algorithm applied to a space trajectory design problem. Then, we present some performance indexes that can
be used to evaluate the effectiveness of global optimization algorithms. The performance
indexes are then compared highlighting the actual significance of each one of them. A number of global optimization algorithms are tested on four typical space trajectory design problems. From the results of the proposed testing procedure we infer for each pair
algorithm-problem the relation between the heuristics implemented in the solution algorithm and the main characteristics of the problem under investigation. From this analysis we derive a novel interpretation of some evolutionary heuristics, based on dynamical system
theory and we significantly improve the performance of one of the tested algorithms
Arcabouço de PLLA/HAP sinterizado, com potencial de utilização em regeneração de tecido ósseo
Get PDFTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência e Engenharia de Materiais.Alguns arcabouços (scaffolds) são fabricados usando polímeros como os poliésteres que podem ser biodegradáveis e biorreabsorvíveis. Para se obter melhores propriedades mecânicas, arcabouços têm sido fabricados utilizando-se uma mistura de polímero e cerâmica. Um parâmetro importante em engenharia de tecido ósseo é porosidade e a interconectividade entre os poros. Nesse trabalho, o método de sinterização foi testado utilizando-se o compósito a base de poli(L-ácido láctico) e hidroxiapatita para obtenção de arcabouços porosos. A caracterização foi realizada utilizando-se microscopia eletrônica de varredura, análise de porosidade e teste de resistência à compressão. Utilizou-se para o PLLA duas faixas granulométricas, 106-212 e 212-300 µm. Para a hidroxiapatita foram utilizadas partículas nanométricas e fibras com razão de aspecto próximo a 40. As concentrações mássicas utilizadas para o compósito PLLA/Hap variaram nas proporções de 90/10, 80/20, 70/30%. A partir da combinação dessas variáveis, constituiu-se um grupo de estudo contendo 12 combinações diferentes. Os resultados obtidos mostraram que as amostras que utilizaram fibras de hidroxiapatita apresentaram tempo de programação isotérmica aproximadamente 4 vezes menor do que as amostras que utilizaram partículas. Esse tempo aumentou em função do aumento do tamanho de partícula polimérica devido à redução da energia de superfície e mobilidade atômica das partículas, e em função do aumento da concentração de hidroxiapatita, que atuou como barreira mecânica dificultando o processo de sinterização. Os resultados obtidos mostraram que é possível controlar o processo de sinterização para obtenção de matrizes tridimensionais. Foram obtidas amostras com poros interconectados, tamanho de poro variando entre 150 e 350 µm e porosidade entre 48 e 61%, sendo que as formulações que utilizaram partículas apresentaram maior porosidade. A resistência mecânica média variou entre 1,7 e 12MPa, valores semelhantes ao do osso trabecular, que varia entre 2 e 12MPa
MGA trajectory planning with an ACO-inspired algorithm
Get PDFGiven a set of celestial bodies, the problem of finding an optimal sequence of gravity assist manoeuvres, deep space manoeuvres (DSM) and transfer arcs connecting two or more bodies in the set is combinatorial in nature. The number of possible paths grows exponentially with the number of celestial bodies. Therefore, the design of an optimal multiple gravity assist (MGA) trajectory is a NP-hard mixed combinatorial-continuous problem, and its automated solution would greatly improve the assessment of multiple alternative mission options in a shorter time. This work proposes to formulate the complete automated design of a multiple gravity assist trajectory as an autonomous planning and scheduling problem. The resulting scheduled plan will provide the planetary sequence for a multiple gravity assist trajectory and a good estimation of the optimality of the associated trajectories. We propose the use of a two-dimensional trajectory model in which pairs of celestial bodies are connected by transfer arcs containing one DSM. The problem of matching the position of the planet at the time of arrival is solved by varying the pericentre of the preceding swing-by, or the magnitude of the launch excess velocity, for the first arc. By using this model, for each departure date we can generate a full tree of possible transfers from departure to destination. Each leaf of the tree represents a planetary encounter and a possible way to reach that planet. An algorithm inspired by Ant Colony Optimization (ACO) is devised to explore the space of possible plans. The ants explore the tree from departure to destination adding one node at the time: every time an ant is at a node, a probability function is used to select one of the remaining feasible directions. This approach to automatic trajectory planning is applied to the design of optimal transfers to Saturn and among the Galilean moons of Jupiter, and solutions are compared to those found through traditional genetic-algorithm-based techniques
