370,377 research outputs found
Frequency domain iterative feedforward/feedback tuning for MIMO ANVC
No full textA new iterative feedback/feed-forward tuning (IFFT) method is presented for multiple-input multiple-output (MIMO) control systems that relies on efficient computation of the negative gradient of the controller cost function in the frequency domain. The iterative method is using only one experiment per iteration and it is therefore suitable for realtime implementation for periodic adjustment of the controller. The primary target application area of the presented method is self-tuning feedback control in active noise and vibration control (ANVC)
The influence of multiple tubes on the tube-to-bed heat transfer in a fluidised bed
No full textThere have been few studies modelling both flow and heat transfer in fluidised beds. The kinetic theory of granular flow (KTGF) has been used for flow prediction in the past without heat transfer modelling. In the present study, a two-fluid Eulerian-Eulerian formulation incorporating the KTGF was applied first to a tube-to-bed reactor with one immersed tube and compared with the results in the literature. The bed was then modified to introduce two and three heated tubes. The effects on the flow and temperature distribution, local heat transfer coefficients and averaged heat transfer coefficients over a 3.0s time period were carried out. Results showed that increasing the number of tubes promotes heat transfer from tubes to the particles and flow. The heat transfer coefficients extracted from the single-tube to three-tube cases were analyzed in detail, confirming the importance of linking flow/particle and heat transfer calculation
Transition metal compounds with S/N-functionalized NHC ligands: structures, redox properties and electrocatalytic activity
No full textThe research described in
this thesis focused on the preparation of S/N functionalized carbene ligands
and their transition metal complexes, and the exploration of their application
as electrocatalysts for proton reduction. Metals in Catalysis, Biomimetics & Inorganic Material
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Synthesis and Anti-HIV Activity of Guanine Modified Fluorinated Acyclic Nucleoside Phosphonate Derivatives
No full textThe preparation of an unprecedented series of nucleobase modified 3-fluoro-2-(phosphonomethoxy)propyl (FPMP) acyclic nucleosides in both their (R) and (S) enantiomerically pure forms is described. The synthesis focuses on a Mitsunobu alkylation reaction to construct the C-N(9) bond between a chiral fluorinated side-chain residue and 6- or 7-modified guanine analogs. Prodrugs of FPMP-7-deazaguanine were also synthesized by derivatization of the corresponding phosphonic acid functionality with (bis)diamyl aspartate amidate groups, leading to moderate activity against human immunodeficiency virus type 1 (HIV-1).sponsorship: Min Luo greatly acknowledges the China Scholarship Council (CSC, 201306220071) for funding. We thank Eric Fonteyn, Sandra Claes, and Evelyne Van Kerckhove for excellent technical assistance in the generation of the anti-HIV-1 data. (China Scholarship Council (CSC)|201306220071)status: Publishe
Squatinella curviseta Luo & Segers 2020, n. sp.
No full textSquatinella curviseta n. sp. Figures 1 a–b, I-3 Type locality. Lohulu River near Bomane, DR Congo 24 May 2010 (KM49). Material examined. Holotype: One female specimen in permanent slide, deposited in RBINS (RIR.332); Paratypes: five permanent slides containing one female specimen each, deposited in RBINS (RIR.333 to RIR.338); one permanent slide containing seven female specimens, deposited in CSB-UK. Differential diagnosis. This new species is close to S. variegata, as it shares with it a foot made up of two basal foot pseudosegments and a third element consisting of the fused third foot pseudosegment and the toes. The two differ by the rather rigid dorsal spine, which is variable in length but always straight in S. variegata, and relatively short and weakly but clearly and consistently S-shaped in S. curviseta n. sp. This peculiar spine shape may be adaptive: in swimming specimens the spine is bent posteriad, along the longitudinal axis of the body; in S. curviseta n. sp. this S-shaped spine will fit snugly over the body and foot, possibly resulting in reduced drag when the animal glides over a surface. Differential diagnosis. Parthenogenetic female (male unknown): body elongate, separated in a head, trunk, and foot region, lorica relatively soft but body shape rather constant. Head dorso-ventrally flattened, with a semi-circular head shield covering the homogeneous corona; lateral projections of the posterior corona region present. Head and trunk separated by a weakly constricted neck. Trunk rather plump, ventrally bulbous, dorsally with a middorsal, rigid, weakly S-shaped and terminally blunt spine; this spine movable from erect to dorsally, parallel to the body axis overlaying the foot. Terminal part of the trunk bulging. Foot with two separated foot pseudosegments, the second about twice as long as the first, third foot element more than twice as long as the second foot pseudosegment, bearing a sensory groove dorsally near its basis. Terminal foot element almost parallel-sided in the basal two thirds, then tapering to a point, distally with a short median fissure. Measurements (n=10). Total length (including foot): 219–257 (238), height: 94–117 (104), second foot pseudosegment: 19–27 (22), fused third segment and toes: 30–46 (37), dorsal spine: 146–190 (161), ratio spine:body length: 0.66–0.92 (0.83). Etymology. The specific name is an adjective, and refers to the species’ unique curved dorsal spine.Published as part of Luo, Yongting & Segers, Hendrik, 2020, Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers, pp. 371-387 in Zootaxa 4731 (3) on pages 380-382, DOI: 10.11646/zootaxa.4731.3.6, http://zenodo.org/record/365363
Study of wall-to-bed heat transfer in a bubbling fluidised bed using the kinetic theory of granular flow
No full textResearch into heat transfer modelling in fluidised beds is very limited due to its complexity. The kinetic theory of granular flow (KTGF) has been applied successfully to hydrodynamic modelling in the past but its application in heat transfer modelling has not been tested extensively. A two-fluid Eulerian–Eulerian model has been carried out applying the KTGF to a wall-to-bed reactor. The local heat transfer coefficients are compared against experimental data for two drag models, namely the Gidaspow and the Syamlal–O’Brien drag models. Furthermore, a parametric study is carried out for a variety of coefficients of restitution, particle diameter sizes and inlet velocities. Near wall analysis is carried out in both dense and dilute regions. Both drag models detect the passage of the bubble reasonably well but they predict the complete transition of the bubble past the sensors occurs at slightly different times. The heat transfer coefficients obtained with the Syamlal–O’Brien model showed more local fluctuations than the Gidaspow model because the Syamlal–O’Brien models was developed based on the particle terminal velocities which would indicate a slight sensitivity to a microscopic scale. Extension of the simulation for a longer period makes it possible to reveal that a periodic distribution occurred after 1.5 s and the local heat transfer coefficients gradually reduced to agree better with the experimental results which were previously over estimated. The study shows that a regular dynamic pattern is established in the bubbling fluidised bed only after 1.5–2 s
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The Selected Chinese Art Songs of Luo Zhongrong
No full textLuo Zhongrong (1924–2021) is a pivotal figure in Chinese art songs, known for blending the lyrical essence of classical Chinese poetry with Western compositional techniques. His works serve as a cultural bridge, preserving the elegance of Tang and Song poetry while engaging with modern musical language. However, his songs are rarely performed outside China, largely due to the linguistic challenges faced by non-native Mandarin speakers and the lack of accessible pedagogical resources.This study presents an in-depth performance and teaching guide to eleven of Luo’s settings of classical poetry. It explores his compositional methods, highlighting how poetic tone, rhythm, and imagery shape his melodic and harmonic decisions. To aid singers unfamiliar with tonal languages, the study includes pronunciation tips and transliteration tools for Mandarin diction.The research consists of five main parts: Luo’s biography, stylistic analysis of selected art songs, poetic interpretation grounded in historical context, a guide to Mandarin tones and phrasing, and a thematic catalog of Luo’s vocal works. Special attention is given to the role of the piano accompaniment in shaping vocal expression. Appendices provide a curated concert program and a categorized song list, with tools for accurate pronunciation and stylistic nuance. This project aims to make Luo Zhongrong’s art songs more accessible across cultures, enriching vocal literature and expanding cross-cultural appreciation.</p
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