1,724,017 research outputs found
Absorbing Boundary Conditions for Electromagnetic Wave Propagation
No full textFeng, X.. (1997). Absorbing Boundary Conditions for Electromagnetic Wave Propagation. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3078
Identification of Immune Gene Signature Associated with T Cells and Natural Killer Cells in Type 1 Diabetes [Corrigendum]
Full text linkWang N, Wang G, Feng X, Yang T. Diabetes Metab Syndr Obes. 2024;17:2983—2996.
The authors have advised the affiliation callouts in the author list on page 2983 are incorrect. The correct author callouts should read as follows:
Na Wang1, Guofeng Wang1,2, Xiuli Feng1, Teng Yang
Consolidated undrained load-carrying capacity of subsea mudmats under combined loading in six degrees of freedom
Full text linkA generalised framework is presented for predicting the consolidated undrained capacity of rectangular mat foundations on normally consolidated soft clay under combined loading in six degrees of freedom as a function of relative preload and degree of consolidation. Consolidated undrained response is investigated by coupled small-strain finite-element analysis using the modified Cam Clay plasticity constitutive model. Increases in the load-carrying capacity of a foundation under combined loading in six degrees of freedom following vertical preload with subsequent consolidation are demonstrated and quantified. The results are presented as failure envelopes in multi-directional load space and are shown to expand proportionally as a function of degree of consolidation for a given relative preload. A methodology and a set of expressions are provided to predict the shape and size of failure envelopes for rectangular mat foundations for any degree of preloading and consolidation.</p
Modelling sliding resistance of tolerably mobile subsea mudmats
Full text linkSubsea infrastructure for deep-water oil and gas developments is often supported by mudmat foundations. Traditionally, subsea mudmats are designed to resist the loads imposed by pipeline thermal expansion and contraction while remaining stationary. As subsea facilities have grown, the required size andweight of the mudmats challenge the handling capacity of installation vessels and raise costs. Tolerable mobility of a subsea mudmat can significantly relieve the applied loads, leading to reduced mudmat size and weight. In this paper, the cyclic shearing and reconsolidation response of fine-grained soil around a tolerably mobile mudmat is investigated through results of finite-element analysis using a critical state soil model. The mudmat was subjected to a simulated lifetime of operation, with many cycles of undrained sliding with intervening consolidation between cycles. The sliding resistance was shown to rise exponentially with cycles and reach the drained limit, accompanied by significant strength gain in the subsoil because of the intervening consolidation between movements. The degree of reconsolidation between slides affects the number of cycles required to mobilise the drained limit. The hardening response for periodic shearing with intervening consolidation is shown to scale from the hardening response for continuous undrained shearing by an amount depending on the degree of intervening consolidation during pipeline operation. Expressions for the rate of hardening of sliding resistance of a tolerably mobile mudmat foundation are proposed in this paper to assist design practice.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Non-silica microstructured optical fibers
No full textMicrostructured fibres offer a range of optical properties that cannot be achieved in conventional (solid) optical fibres. Although to date, most work in this field has focused on silica glass, non-silica microstructured fibres are attractive for applications including nonlinear devices, mid-IR transmission and photonic bandgap operation. A review of progress in the development and applications of non-silica microstructured fibres will be presented
Fabrication of optical fibre nanowires and their optical and mechanical characterisation
No full textIt is demonstrated for the first time that long nanowires with radii as small as 30 nm can be manufactured with a conventional coupler fabrication rig. The temporal deterioration of nanowire optical properties has been studied and correlated with its mechanical behaviour. The original transmission properties have been restored by a postfabrication treatmen
Undrained capacity of surface foundations with zero-tension interface under planar V-H-M loading
No full textUndrained capacity of strip and circular surface foundations with a zero-tension interface on a deposit with varying degrees of strength heterogeneity is investigated by finite element analyses. The method for simulating the zero-tension interface numerically is validated. Failure envelopes for strip and circular surface foundations under undrained planar V-H-M loading are presented and compared with predictions from traditional bearing capacity theory. Similar capacity is predicted with both methods in V-H and V-M loading space while the traditional bearing capacity approach under-estimates the V-H-M capacity derived from the numerical analyses due to superposition of solutions for load inclination and eccentricity not adequately capturing the true soil response. An approximating expression is proposed to describe the shape of normalised V-H-M failure envelopes for strip and circular foundations with a zero-tension interface. The unifying expression enables implementation in an automated calculation tool resulting in essentially instantaneous generation of combined loading failure envelopes and optimisation of a foundation design as a function of foundation size or material factor. In contrast, the traditional bearing capacity theory approach or direct numerical analyses for a given scenario requires ad-hoc analyses covering a range of input variables in order to obtain the 'best' design.</p
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