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排序方式: 共有192条查询结果,搜索用时 15 毫秒
31.
Luigi Coppola Mohamed Youssry Isabella Nicotera Luigi Gentile 《Journal of colloid and interface science》2009,338(2):550-557
The thermal behavior of unsonicated dispersions of a double-chained surfactant, Dioctadecyldimethylammonium bromide (DODAB), has been studied over a wide concentration range using DSC and dynamic rheology. All dispersions are characterized by the pre- and main transition peaks at 35 °C and 43 °C, respectively. But, only above 10 mM DODAB, a third endotherm at 52 °C appears which may correspond to the (ULVs + Lα fragments) → MLVs transition. The thermal-induced MLV’s size is proportionally dependent on the concentration. In addition, and in agreement with DSC data, dynamic rheology has proven to be an indirect way to elucidate the structural transitions in these DODAB vesicular dispersions. 相似文献
32.
Thampy V Kang J Rodriguez-Rivera JA Bao W Savici AT Hu J Liu TJ Qian B Fobes D Mao ZQ Fu CB Chen WC Ye Q Erwin RW Gentile TR Tesanovic Z Broholm C 《Physical review letters》2012,108(10):107002
Using polarized and unpolarized neutron scattering, we show that interstitial Fe in superconducting Fe(1+y)Te(1-x)Se(x) induces a magnetic Friedel-like oscillation that diffracts at Q⊥=(1/2 0) and involves >50 neighboring Fe sites. The interstitial >2μ(B) moment is surrounded by compensating ferromagnetic four-spin clusters that may seed double stripe ordering in Fe(1+y)Te. A semimetallic five-band model with (1/2 1/2) Fermi surface nesting and fourfold symmetric superexchange between interstitial Fe and two in-plane nearest neighbors largely accounts for the observed diffraction. 相似文献
33.
Gentile L Silva BF Balog S Mortensen K Olsson U 《Journal of colloid and interface science》2012,372(1):32-39
In this study, we investigate structural transitions of tetraethylene glycol monohexadecyl ether (C(16)E(4)) in D(2)O as a function of shear flow and temperature. Via a combination of rheology, rheo-small-angle neutron scattering and rheo-small-angle light scattering, we probe the structural evolution of the system with respect to shear and temperature. Multi-lamellar vesicles, planar lamellae, and a sponge phase were found to compete as a function of shear rate and temperature, with the sponge phase involving the formation of a new transient lamellar phase with a larger spacing, coexisting with the preceding lamellar phase within a narrow temperature-time range. The shear flow behavior of C(16)E(4) is also found to deviate from other nonionic surfactants with shorter alkyl chains (C(10)E(3) and C(12)E(4)), resembling to the C(16)E(7) case, of longer chain. 相似文献
34.
James E. Gentile Gregory J. Davis Samuel S. C. Rund 《Computational & Mathematical Organization Theory》2012,18(4):404-418
Agent-based modeling has been well received in the simulation community. Complex systems are simulated by many autonomous agents whose behavior is defined by a conceptual model. However, the model can be improperly implemented or misinterpreted resulting in an implementation that does not reflect the conceptual rules. It is imperative that the implementation’s function be tested against the model’s expected outcome. In this paper, we present certain steady-state techniques that can be used to verify the operation of agent-based simulations. These methods are introduced and then applied to an ecological model which simulates reproductive dynamics of mosquitoes. 相似文献
35.
Raasti Naseem Giorgia Montalbano Matthew J. German Ana M. Ferreira Piergiorgio Gentile Kenneth Dalgarno 《Molecules (Basel, Switzerland)》2022,27(21)
PLLA, PCL and PHBV are aliphatic polyesters which have been researched and used in a wide range of medical devices, and all three have advantages and disadvantages for specific applications. Blending of these materials is an attractive way to make a material which overcomes the limitations of the individual polymers. Both PCL and PHBV have been evaluated in polymer blends with PLLA in order to provide enhanced properties for specific applications. This paper explores the use of PCL and PHBV together with PLLA in ternary blends with assessment of the thermal, mechanical and processing properties of the resultant polymer blends, with the aim of producing new biomaterials for orthopaedic applications. DSC characterisation is used to demonstrate that the materials can be effectively blended. Blending PCL and PHBV in concentrations of 5–10% with PLLA produces materials with average modulus improved by up to 25%, average strength improved by up to 50% and average elongation at break improved by 4000%, depending on the concentrations of each polymer used. PHBV impacts most on the modulus and strength of the blends, whilst PCL has a greater impact on creep behaviour and viscosity. Blending PCL and PHBV with PLLA offers an effective approach to the development of new polyester-based biomaterials with combinations of mechanical properties which cannot be provided by any of the materials individually. 相似文献
36.
Rosita Diana Francesco Silvio Gentile Antonio Carella Luigi Di Costanzo Barbara Panunzi 《Molecules (Basel, Switzerland)》2022,27(18)
Advanced chromophoric tools, besides being biologically active, need to meet the expectations of the technological demands including stability, colour retention, and proper solubility for their target. Many coordination compounds of conjugated ligands are antibacterial dyes, able to combine a strong dyeing performance with a useful biological activity. Specifically, palladium (II) complexes of Schiff base ligands are known for their relevant activity against common bacteria. In this article, we report the synthesis and comprehensive experimental and theoretical characterization of two novel Pd(II) chromophore complexes obtained from a cyclopalladated Schiff base as two different chelating azo dyes. The antibacterial response of these two novel complexes was tested against the ubiquitous Escherichia coli bacterium in an aqueous medium and revealed a noteworthy antimicrobial activity, higher than when compared with their uncoordinated biologically active ligands. 相似文献
37.
Support-graph preconditioners have been shown to be a valuable tool for the iterative solution, via a Preconditioned Conjugate
Gradient method, of the KKT systems that must be solved at each iteration of an Interior Point algorithm for the solution
of Min Cost Flow problems. These preconditioners extract a proper triangulated subgraph, with “large” weight, of the original
graph: in practice, trees and Brother-Connected Trees (BCTs) of depth two have been shown to be the most computationally efficient
families of subgraphs. In the literature, approximate versions of the Kruskal algorithm for maximum-weight spanning trees
have most often been used for choosing the subgraphs; Prim-based approaches have been used for trees, but no comparison have
ever been reported. We propose Prim-based heuristics for BCTs, which require nontrivial modifications w.r.t. the previously
proposed Kruskal-based approaches, and present a computational comparison of the different approaches, which shows that Prim-based
heuristics are most often preferable to Kruskal-based ones.
This paper has been partially supported by the UE Marie Curie Research Training Network no. 504438 ADONET. 相似文献
38.
A system of fermions on a one-dimensional lattice, subject to a weak periodic potential whose period is incommensurate with
the lattice spacing and satisfies a Diophantine condition, is studied. The Schwinger functions are obtained, and their asymptotic
decay for large distances is exhibited for values of the Fermi momentum which are multiples of the potential period 相似文献
39.
40.
Csorna SE Mestayer MD Panvini RS Word GB Yi X Bean A Bobbink GJ Brock I Engler A Ferguson T Kraemer R Rippich C Sutton R Vogel H Bebek C Berkelman K Blucher E Cassel DG Copie T DeSalvo R DeWire JW Ehrlich R Galik RS Gilchriese MG Gittelman B Gray SW Halling AM Hartill DL Heltsley BK Holzner S Ito M Kandaswamy J Kowalewski R Kreinick DL Kubota Y Mistry NB Mueller J Nordberg E Ogg M Peterson D Perticone D Pisharody M Read K Riley D Silverman A Stein PC Stone S Sadoff AJ Avery P Besson D Bowcock T 《Physical review letters》1986,56(12):1222-1225