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5 from Perseus Tools and Information

1. Gela: Italy [Atlas site] (5.17)

2. Gela: Italy [Atlas site] (4.50)

3. Gela: Italy [Atlas site] (4.38)

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72 from Greek and Roman Materials

1. 99. 13.199 LEKYTHOS from Gela PLATE LI, 3 [Reference article in J. D. Beazley, L. D. Caskey, Attic Vase Paintings in the Museum of Fine Arts, Boston] (12.07)

2. Gela, Gela, Temple of Athena, Temple of Athena: Detail of re-erected column of the temple, from NW [Image] (6.35)

3. Gela, Gela, Temple of Athena, Temple of Athena: Triglyphs [Image] (5.84)

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953 from Beazley Archive

1. Syracuse, Museo Arch. Regionale Paolo Orsi, 45048: LEKYTHOS; GELA PAINTER; ROWS OF PATTERNS [Beazley Archive Vase] (8.51)

2. Providence (RI), Rhode Island School of Design, 25.078: LEKYTHOS; BRYGOS PAINTER; HERA SEATED WITH SCEPTRE AND PHIALE, BIRD AND CHAIR [Beazley Archive Vase] (8.32)

3. Amsterdam, Allard Pierson Museum, 3741: LEKYTHOS; GELA PAINTER; ATHLETES, ACONTIST, DISKOBOLOS, TRAINER, MAN IN CHITON PLAYING PIPES, COLUMN [Beazley Archive Vase] (7.83)

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2 from CIMI Metadata Harvesting Working Group Demonstration Repository

1. COLLECTOR: J. BRAZIER 1865 ? or 1872 ?; COLLECTOR: J. BRAZIER 1865 ? or 1872 ?; (in English) Length: -, Width: 4.0 cm (?) / SHELL, STAR-SHAPED WITH CENTRAL PERFORATION / W.J. MACLEAY COLLECTION / COLLECTOR: J. BRAZIER ? HMS CURACOA 1865 ? OR HMS BLANCHE 1872 ? [Text] (1.11)

2. (in English) Terracotta squatting satyr. [Text] (1.02)

1 from Chemistry Preprint Server

1. James Weeks, Jeroen van Duijneveldt, Brian Vincent; Formation and Collapse of Gels of Sterically Stabilised Colloidal Particles: Colloidal silica spheres (diameter 88 nm) with a thick steric stabilisation layer of polystyrene (PS; M_w=26,600 g/mol) were prepared. In cyclohexane, a marginal solvent for PS, particle aggregation and gelation were observed on quenching the temperature. Near the gelation temperature and at particle concentrations of a few percent by weight, the gels were sufficiently weak to slowly compact under gravity. On quenching to slightly lower temperatures, the gels still settled, but the top of the sediment did not become flat, as is usually the case. This seems to be related to an unusual mechanism for gel compaction, which starts by forming a more dense structure at the top of the sample. It is proposed that this is related to the entangled polymer chains on neighbouring particles resisting substantial rearrangement of the local structure. The transient gelation phenomenon, observed previously for mixtures of colloid and non-adsorbing polymer, has so far not been observed for our system. [Text] [View with Perseus links] (2.48)

2 from DUETT - Dissertations and other Documents of the Gerhard-Mercator-University Duisburg

1. Kisters, Dirk; Charakterisierung thermoreversibler Gele im Zentrifugalfeld - Characterization of thermoreversible gels in a centrifugal field: Prof. Dr. Werner Borchard; (in German) In the theoretical part of this work it is shown that the Lamms Differential Equation for polymer solutions can be extended to swollen polymer networks, if the phenomenological equations and the equation for the chemical potential of the polymer component in the network are taken into account. All differences for a transition from a polymer solution to a swollen polymer network can be assigned a "Elastically active coefficient E", which describes a deformation velocity with the same unit as the diffusion coefficient. In the practical part of this thesis some new improvements/developments regarding the Schlieren optical system are introduced and discussed. In the part "Results and Discussion" the results of the centrifugal measurements of gelatine gels are presented and discussed. The following evaluation of the centrifugal runs of polyacrylat gels (chemical networks) and the comparison with the results of the gelatine gels (physical networks) shows clearly that the new theory is suitable to describe the move ment of the polymer component in the network in a centrifugal field quantitatively as well as qualitatively. [Text] [View with Perseus links] (2.77)

2. Lechtenfeld, Markus; Auswertung der rheologischen und optischen Untersuchungen wahrend der Gelierung des Systems Gelatine / Wasser mit Hilfe der Perkolationstheorie - Evaluation of rheological and optical investigations during the gelation of the system gelatin/water using the percolation theory: Prof. Dr. rer.nat. Werner Borchard, Prof. Dr. rer.nat. Wiebren S. Veeman; (in German) In the thesis the gelation of the system gelatin / water was investigated by use of rheological and optical methods. The rheological properties were taken to describe the gelation in terms of the percolation theory. In order to determine the gel point and the critical exponents a potential law found by Stauffer and de Gennes that describes the development of the storage and loss modulus was used to express normalized percolation approches. This normalized percolation ansatzes delivers a single very exact gelation time and the information which range should be taken for the evaluation. Combining the storage and the loss modulus symmetrically around the gel point novel so called combined percolation functions were formulated. From these combined functions the critical exponents could likewise be determined. The simultaneous measurements of the rheological and optical properties clearly show that close to the gel point the loss and the storage modulus as a function of time as well as a function of the optical rotation could be described in terms of the percolation theory. Furthermore an aggregation model was formulated that describes the development of the storage modulus close and far away from the gel point, respectively. [Text] [View with Perseus links] (2.20)

1 from Ethnologue: Languages of the World

1. GELA: a language of Solomon Islands: A page from the Web edition of the Ethnologue giving basic facts about the language and where it is spoken. [Text] [View with Perseus links] (3.03)

1 from LSU Electronic Thesis and Dissertation Archive

1. Sun, Liangfeng; Thermal Rheological Analysis of Cure Process of Epoxy Prepreg: (in English) The cure process of epoxy prepreg used as composite pipe joints was studied by means of differential scanning calorimetry (DSC), Bohlin Rheometer and other techniques. Isothermal DSC measurements were conducted between 110 and 220 oC, at 10 oC intervals. The results show that the complete cure reaction could be achieved at oC. The isothermal cure process was simulated with the four-parameter autocatalytic model. Except in the late stage of cure reaction, the model agrees well with the experimental data, especially at high temperatures. To account for the effect of diffusion on the cure rate, a diffusion factor was introduced into the model. The modified model greatly improved the predicated data at the late stage of cure reaction. The dynamic cure process was different from the isothermal cure process in that it is composed of two cure reactions. For dynamic cure process, a three-parameter autocatalytic model was used. The parameters in the model were determined by two methods. One was based on Kissinger and Ozawa approach. The whole curing process was modeled with two reactions. Another method was based on Borchardt and Daniels kinetic approach with whole curing process was modeled with one reaction. The fitting results by first and second method agreed well with experimental value in the late and early cure stage, separately. Rheological properties of epoxy prepreg are closely related to the cure process. With the development of cure reaction, gelation occurs and epoxy prepreg becomes difficult to process. As temperature increases, the gel time decreases. Viscosity profiles were described by different models. Except the first and nth order viscosity models, new viscosity models were proposed The proposed new viscosity models are better than the old models for both isothermal and dynamic cure processes. To graphically represent the phase changes of the cure process, the isothermal cure diagrams of time-temperature-transformation (TTT) and conversion-temperature-transformation (CTT) are constructed. Each region in TTT and CTT diagrams corresponds with the phase state of the cure process, so the cure mechanism is clearly shown in the diagrams. [Text] [View with Perseus links] (0.38)

4 from OCLC Online Computer Library Center Theses and Dissertations Repository

1. Stevens, William Edward; A theoretical analysis of cavitation in polymeric membranes during gelation.: Principal faculty advisor: Charles A. Petty., Thesis (M.Ch.E.) - University of Delaware. [Text] (2.35)

2. Abdulgani, Roeslan,--1914-, Yamin, Muhammad, 1903-1962.; Politik dan ilmu /--diutjapkan oleh H. Roeslan Abdulgani.: In Indonesian or English., Address--Universitas Padjadjaran (pada waktu menerima gelar doctor honoris causa dalam ilmu politik) 31 Djuli 1961., Politik dan ilmu (p. 9-16).--Uraian pendjelasan promotor Prof. Mr. H. Mohamad Yamin [and other materials] (p. 17-160).--Gambar-gambar (p. 161-171). [Text] (1.32)

3. Abdulgani, Roeslan,--1914-; Politik dan ilmu /--diutjapkan oleh H. Roeslan Abdulgani.: In Indonesian or English., Address--Universitas Padjadjaran (pada waktu menerima gelar doctor honoris causa dalam ilmu politik) 31 Djuli 1961., Politik dan ilmu (p. 9-18).--Uraian pendjelasan Prof. Mr. H. Mhd. Yamin [and other materials] (p. 19-176).--Gambar-gambar (leaves 1-12) [Text] (1.32)

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1 from The Eberhard Karls University of Tuebingen

1. Lindner, Ekkehard; ... : Vorlesung Experimentalchemie I, Anorganische Chemie, WiSe 1999/2000, 18.02.2000, 1. Stunde: Einfuhrung in die anorganische Experimentalchemie, Komplex-Ligand, Cyanidanion; Hexacyanoferrat-Komplex; Berliner Blau, Eisen-Nachweis; Silicium, Vorkommen; Siliciumdioxid, Modifikationen; Quarz alpha, Kristallgitter; Beta-Quarz; Beta-Tridymit, Kristallgitter; Beta-Cristobalit, Kristallgitter; Quarz, geringer Ausdehnungskoeffizient; Kieselsaure; Orthokieselsaure; Orthodikieselsaure; Kieselsaure polymer, Kettenstruktur; Kieselsaure polymer, Bandstruktur; Kieselsaure polymer, Blattstruktur; Glimmer-Struktur; Siliciumdioxid, Raumnetzstruktur; Wasserglas, Darstellung; Kolloide; Faraday-Tyndall-Effekt; Kolloidale Losung (Sol), Herstellung; Dispersionsmethode; Kondensationsmethode; Dialyse; Dialysator, Schema; Dialysegeschwindigkeit; Hydrophobe Kolloide, geladene Teilchen; Metallsole; Metallsulfidsole; Elektrophorese; Hydrophile Kolloide; Silica-Gel; Kiesel-Xerogel; Cobalt(II)chlorid wasserfrei; Kolloide, Bildung [Image] [View with Perseus links] (0.42)

1 from University of Illinois Library

1. Buzzi-Peccia, A.; Serenata Gelata [Text] (3.31)

2 from Virginia Tech Electronic Thesis and Dissertation Collection

1. Li, Chenghong; Inorganic-Organic Sol-Gel Derived Hybrid Materials as Abrasion Resistant Coatings: Thomas C. Ward, John G. Dillard, Judy S. Riffle, Richey M. Davis, Garth L. Wilkes; (in English) Inorganic-organic hybrid materials have been developed using sol-gel reactions of a trialkoxysilylated organic compound and a metal or semi-metal alkoxide and applied as coatings on polymeric or metallic substrates. Many of these coatings have demonstrated good to excellent abrasion resistance. Abrasion resistant coatings were prepared by hydrolysis and condensation of mixtures of a triethoxysilylated diethylenetriamine (f-DETA), tetramethoxysilane (TMOS), water and an alcohol in the presence of an acid catalyst (a one-step hydrolysis approach). The influences of many formulation and processing variables on the gelation time, optical properties, hardness and abrasion resistance were investigated. An aminolysis mechanism was also proposed to explain the adhesion between sol-gel derived coatings and polycarbonate substrates promoted by a 3-aminopropyltriethoxysilane (3-APS) primer. FT-IR, GPC, 1H and 13C NMR, XPS experiments were conducted to support this mechanism. The f-DETA/TMOS system is essentially a binary system of an alkyltriethoxysilane (T) and a tetraalkoxysilane (Q). At pH 0-2 and pH 4-5, the relative condensation reactivities of the T and Q species in this system were compared using 29Si NMR spectroscopy. After thermal curing, 13C or 29Si solid state NMR spectroscopy was used to estimate the extent of hydrolysis of the urea linkages in f-DETA, the concentration of residual alkoxysilane groups, and the extent of condensation for both T and Q species. The dependence of the morphology of f-DETA/TMOS gels on the pH and the water concentration was also investigated using AFM, SEM and SAXS. Many other trialkoxysilylated organic compounds containing urea, urethane, epoxy and siloxane linkages were also synthesized and utilized to prepare abrasion resistant coatings via a one-step hydrolysis approach, a two-step hydrolysis approach or a moisture-curing approach. Coatings derived from many of these systems or approaches demonstrated abrasion resistance comparable to that of the f-DETA/TMOS coating. Thin coatings were also derived from cubic octasilicate monomers via hydrosilylation or sol-gel reactions. These coatings were very transparent but unfortunately lacked abrasion resistance. [Text] [View with Perseus links] (1.75)

2. Droesch, Kristen L; THE DEVELOPMENT OF GELATIN BASED TISSUE ADHESIVES FOR USE IN SOFT TISSUE BIOMEDICAL APPLICATIONS: Sean G. Corcoran Ph.D., Brian J. Love Ph.D., Jonette Rogers Foy Ph.D.; (in English) Experiments were performed to characterize the pH, gelation time, diffusion processes, material properties, adhesive properties, and the drying variables on the material and adhesive properties of Gelatin Resorcinol Dialdehyde (GR-DIAL) tissue adhesives by varying formulation. Three adhesive formulations with altered weight content of water and glyoxal (a dialdehyde) were utilized. The adhesive formulations were characterized by pH and gelation time in situ, and absorption/desorption of water in the formed resin. Thermal analysis, mechanical testing, and lap shear adhesive bond testing were utilized to characterize fresh GR-DIAL adhesive formulations and formulations dried at 370C. From the results, the diffusion processes, material and adhesive properties of the adhesive formulations were primarily affected by hydrogen bonding, chemical cross-linking, and the existence of bound water within the bulk adhesive. Formulations with increased glyoxal content had both a higher degree of cross-linking and proportion of bound water within the bulk adhesive. The increased number of chemical cross-links greatly increased the swelling resistance of the adhesives, while, the existence of bound water within the adhesive increased the resistance to drying, and plasticized the resin by depressing the resin glass transition temperature, and increased the adhesive ductility. Hydrogen bonding increased with increased gelatin content or decreased water content, resulting in increased strength and modulus of the adhesives as well as increased adhesive strength. [Text] [View with Perseus links] (1.24)

2 from arXiv

1. Schnurr, B., Gittes, F., MacKintosh, F. C., Schmidt, C. F.; Determining Microscopic Viscoelasticity in Flexible and Semiflexible Polymer Networks from Thermal Fluctuations: We have developed a new technique to measure viscoelasticity in soft materials such as polymer solutions, by monitoring thermal fluctuations of embedded probe particles using laser interferometry in a microscope. Interferometry allows us to obtain power spectra of fluctuating beads from 0.1 Hz to 20 kHz, and with sub-nanometer spatial resolution. Using linear response theory, we determined the frequency-dependent loss and storage shear moduli up to frequencies on the order of a kHz. Our technique measures local values of the viscoelastic response, without actively straining the system, and is especially suited to soft biopolymer networks. We studied semiflexible F-actin solutions and, as a control, flexible polyacrylamide (PAAm) gels, the latter close to their gelation threshold. With small particles, we could probe the transition from macroscopic viscoelasticity to more complex microscopic dynamics. In the macroscopic limit we find shear moduli at 0.1 Hz of G'=0.11 +/- 0.03 Pa and 0.17 +/- 0.07 Pa for 1 and 2 mg/ml actin solutions, close to the onset of the elastic plateau, and scaling behavior consistent with G(omega) as omega^(3/4) at higher frequencies. For polyacrylamide we measured plateau moduli of 2.0, 24, 100 and 280 Pa for crosslinked gels of 2, 2.5, 3 and 5% concentration (weight/volume) respectively, in agreement to within a factor of two with values obtained from conventional rheology. We also found evidence for scaling of G(omega) as \omega^(1/2), consistent with the predictions of the Rouse model for flexible polymers., Comment: 16 pages, with 15 PostScript figures (to be published in Macromolecules) [Text] [View with Perseus links] (1.33)

2. Cueille, Stephane, Sire, Clement; Smoluchowski's equation for cluster exogenous growth: We introduce an extended Smoluchowski equation describing coagulation processes for which clusters of mass s grow between collisions with $ds/dt=As^\beta$. A physical example, dropwise condensation is provided, and its collision kernel K is derived. In the general case, the gelation criterion is determined. Exact solutions are found and scaling solutions are investigated. Finally we show how these results apply to nucleation of discs on a plane, Comment: Revtex, 4 pages (multicol.sty), 1 eps figures (uses epsfig) [Text] [View with Perseus links] (0.57)

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