19,304 research outputs found
Residually finite groups / Lim Hui Min
No full textIn this thesis, we will study a stronger residually finite property called weak potency. More precisely, we aim to study the weak potency of HNN extensions and generalised free products of weakly potent groups and the main tools we used are lters.
First we study the weak potency of HNN extensions by introducing the concept of h-filters and then use it to prove the main criterion. Then we prove several characterisations for the weak potency of certain HNN extensions with cyclic associated subgroups as well as a characterisation for the Baumslag-Solitar groups. Next, we will also apply our results to HNN extensions of finitely generated nilpotent groups. We shall give characterisations for certain HNN extensions of characteristically weakly potent groups with finitely generated central associated subgroups and HNN extensions of free abelian groups of finite rank to be weakly potent.
In the last part we study the weak potency of generalised free products. Werst introduce w-filter and prove a criterion for generalised free products to be weakly potent. By using it, we then give characterisations for the weak potency of generalised free products with cyclic amalgamated subgroups and with central amalgamated subgroups. Then we extend the results to tree products of finitely many groups. Finally we show that certain one-relator groups with torsion are weakly potent
Min Lim Testimonial, Master of Financial Technologies Alum
No full textMin Lim, Master of Financial Technologies Alum provides advice on starting out in postgraduate studies based on her experience at Swinburne
Paramisophria sinjinensis Lim & Min 2013, sp. nov.
No full textParamisophria sinjinensis sp. nov. (Figures 2–5) Material examined Holotype. Dissected adult male (NIBRIV0000263336), 1.41 mm, Sinjindo Island (36 ◦ 40 ′ N, 126 ◦ 08 ′ E), Chungcheongnam-do, South Korea, 2 August 2011, coll. B.J. Lim. Description of male (holotype, NIBRIV0000263336) Body (Figure 2A, B) compact and almost symmetrical. Rostrum (Figure 2C) with a pair of filaments on tip. Cephalosome separated from first pedigerous somite; fourth and fifth pedigerous somites fused and having dorsolateral processes. Urosome fivesegmented. Caudal rami symmetrical, with seven setae and lateral setules on outer margin (Figure 2D). Antennules asymmetrical, left antennule longer than right. Right antennule (Figure 3A) 21-segmented. Armature pattern of segments as follows: segment 1 (corresponding to ancestral segments I–III), 7 + 3ae; segments 2 to 18 (IV–XX), 2 + ae; segment 19 (XXI), 1 + ae; segment 20 (XXII), 1; segment 21 (XXIII–XXVIII), 12 + 2ae. Left antennule (Figure 3B, C) 18-segmented. Segment 1 (I–IV), 7 + 4ae; segments 2 to 6 (V–IX), 2 + ae; segment 7 (X), spiniform seta, 1 seta + ae; segment 8 (XI), 2 + ae; segments 9 to 11 (XII–XIV), spiniform seta, 1 seta + ae; segments 12 to 15 (XV–XVIII), 2 + ae; segments 16 (XIX) and 17 (XX), one plate-like spiniform process, 1 + ae; segment 18 (XXI–XXVIII), two plate-like spiniform processes, 14 + 2ae. Antenna (Figure 4A) with unarmed coxa. Basis with subterminal seta. Endopod elongated and two-segmented; first segment with subdistal seta and fine spinules on surface; second segment with three medial and six distal setae. Exopod sevensegmented indistinctly; first to third segments unarmed; fourth to sixth segments bearing one, two and one setae, respectively; distal segment with one medial and two terminal setae. Gnathobase of mandible (Figure 4B–D) with two sharp teeth, one bifurcated tooth, and two rows of spinules; small rounded process occurring between bifurcated tooth and next tooth. Basis with five setae along outer margin. Endopod reduced, with two unequal setae. Exopod five-segmented; each segment having one, one, one, one and two setae. Maxillule (Figure 4E) reduced. Praecoxal arthrite with one short and four long spines. Coxal epipodite with row of eight outer setae. Basis without endites and with row of setules. Endopod reduced, with two unequal setae distally. Exopod ovoid, with three distal setae. Maxilla (Figure 4F) stout. Praecoxa and coxa completely separated. First and second endites of praecoxa with one and two setae, respectively. Each coxal endite with two setae. Basis with one stout naked spine on medial margin. Endopod with six stout and two short pectinate setae. Maxilliped (Figure 4G) developed. Praecox and coxa fused to form syncoxa with one medial and two subdistal setae. Basis and first endopod partially fused to form allobasis with two medial and one distal setae, and patch of spinules. Endopod fivesegmented; each segment having four, four, three, three and four setae. Swimming legs 1 to 4 (Figure 5A–D) with three-segmented rami. Spine and seta formula shown in Table 2. Coxa of leg 1 (Figure 5A) with dense patch of setae on outer margin. First endopodal segment with row of setae on outer distal angle; second and third segments with setules on posterior surface. First exopodal segment with an outer spine reaching end of next segment; second exopodal segment with setules distally, and third segment with setules on posterior surface. Basis of legs 2 to 4 with two processes on inner distal angle; outer corner of second endopodal segment produced into acute process; distal spine of third exopodal segment longer than other exopodal spines. Leg 5 (Figure 2E) asymmetrical. Left leg without endopod; basis bearing one plumose outer seta. Exopod three-segmented; first segment with outer seta; second segment swollen, with one seta on outer margin; third segment with two small and short setae proximally on outer margin, and one long seta. Right leg uniramous, with basis having one simple seta on posterior surface. Exopod three-segmented indistinctly; first segment with one outer seta; second and third segments incompletely fused; second segment hollowed distally, with one outer seta and dense patch of setules on inner margin; third segment with three setae of unequal lengths. Female: unknown. Etymology The specific name ‘sinjinensis’ is derived from the name of the type locality, Sinjindo Island. Remarks This species is distinguished from its congeners by the following combination of characteristics: the presence of three teeth on the gnathobase of the mandible; the absence of an endopod on the male’s left leg 5; hollowed inner distal margin of the male’s second exopodal segment of right leg 5; and incomplete fusion of the second and third exopodal segments on male’s right leg 5. The males of virtually all species of Paramisophria have an endopod on left leg 5, hence, the lack of this character in the new species can easily be used to distinguish it from almost all other species (except for Paramisophria cluthae T. Scott 1897 and Paramisophria ovata Heinrich 1996). Paramisophria sinjinensis differs from P. cluthae in having dense setae on the outer coxal margin of leg 1 (versus unarmed coxa in P. cluthae); eight (versus seven) outer setae on the coxal epipodite of the maxillule; and an outer seta on the first exopodal segment of right leg 5 (versus absence of seta). Paramisophria sinjinensis differs from P. ovata in the following characters: the presence of dorsolateral processes on the last pedigerous somite (versus no process in P. ovata); the presence of a seta on basis of right leg 5 (versus no seta); the presence of one long and two short setae on the third exopodal segment of left leg 5 (versus one spine and one long seta); and the presence of three setae on the third exopodal segment of right leg 5 (versus two long setae). Table 3 shows a comparison of P. sinjinensis with other species occurring in northeastern Asia. The male P. sinjinensis is similar to P. itoi, but differs in the following characters: 18-segmented (versus 19-segmented) left antennule; two rows of spinules on the gnathobase of the mandible (versus three rows of spinules); the absence of an endopod on left leg 5 (versus a small bulbous rudimentary endopod); and the presence of a hollow (versus swollen) inner distal margin on the second exopodal segment of right leg 5.Published as part of Lim, Byung-Jin & Min, Gi-Sik, 2013, Two new species of hyperbenthic calanoid copepods (Crustacea: Calanoida: Arietellidae) from South Korea, pp. 523-542 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (9 - 10) on pages 526-531, DOI: 10.1080/00222933.2013.825020, http://zenodo.org/record/519934
Flow driven by a torsionally-oscillating shrouded endwall disk
No full textA study is made of time-dependent flow of a viscous fluid driven by an oscillating shrouded disk in finite geometry. Numerical solutions to the Navier-Stokes equations are obtained for the flow in a cylindrical cavity with its upper endwall disk executing torsional oscillation at a velocity Omega cos lambda t. Details of the three-component velocity field are examined at high Reynolds number. The value of the nondimensional amplitude of disk oscillation, epsilon = Omega/lambda encompasses a range up to epsilon greater than or similar to 0 (1). The numerical results for the azimuthal flow for epsilon much less than 1 are consistent with the predictions of the earlier analytical model. The azimuthal flow is largely confined to the Stokes layer thickness. The analytical predictions of the meridional flow, based on a straightforward expansion technique, display discrepancies from the numerical results. The steady meridional streaming at finite values of epsilon is exhibited. The qualitative patterns of meridional steady streaming are verified by laboratory flow visualizations. The explicit effect of Re on the overall flow character is scrutinized. The numerical data are processed to describe the behavior of the torque coefficient at the oscillating disk
Augmentation of convective heat transfer by a torsionally-oscillating endwall disk
No full textAn investigation is made of fluid flow and heat transfer characteristics in a vertically-mounted circular cylinder. Motions are generated by the top endwall disk, which oscillates about the central axis with rotation rate Omega = epsilon lambda cos(lambda t). The temperature of the top disk is higher than that of the bottom disk, producing a stable stratification of Brunt-Vaisala frequency N. Numerical solutions are acquired to the time-dependent Navier-Stokes equations. Comprehensive velocity and temperature data are obtained, which illustrate salient features of quasi-steady periodic flows. As the stratification increases, the steady meridional streaming is confined to a narrow region close to the top disk. Resonance is identified at particular values of (N/lambda), when the system is excited at correct natural frequencies. An elementary inviscid analysis indicates the modes of inertial-gravity oscillations, and the present numerical data are in close agreement with the inviscid results. The amplitudes of fluctuating parts of meridional flow and of Nusselt number display distinctive peaks under resonance conditions. Details of evolutions of fluctuating velocities and temperatures are scrutinized to offer physical explanations for resonance. (C) 1998 Elsevier Science Ltd
A BERT-enhanced Graph Neural Network for Knowledge Base Population
No full textWe present BGKBP, a deep-learning algorithm based on BERT, and a graph neural network for knowledge base population (KBP). Our experiments showed that a straightforward application of BERT and GNN on a large knowledge base (e.g., Wikidata) improves KBP quality and outperforms the previous state-of-the-art methods. We developed four techniques to improve the BGKBP's KBP capability: (1) serialization, (2) fine-tuning, (3) node regression, and (4) text augmentation. BGKBP achieved the best F1 scores of 0.723 and 0.495 on entity linking and new entity detection, respectively. We further showed that using text augmentation (BGKBP-TA) achieved the best F1 score of 0.547 on relation linking, which is more difficult than entity linking because of the various representations of some of the relations. © 2023 IEEE
Yves-Heng Lim
No full textYves-Heng Lim est enseignant-chercheur au Département d’Etudes de Sécurité et de Criminologie de l’Université Macquarie, Sydney. Il est l’auteur de China’s Naval Power: An Offensive Realist Approach (Ashgate, 2014). Yves-Heng Lim is a lecturer at the Department of Security Studies and Criminology, Macquarie University. He is the author of China’s Naval Power: An Offensive Realist Approach (Ashgate, 2014)
A waveform-controlled energy-recycling monophasic Repetitive Transcranial Magnetic Stimulation Device
No full textDevelopment of a serum-free medium for <it>in vitro </it>expansion of human cytotoxic T lymphocytes using a statistical design
No full textAbstract Background Serum-containing medium (SCM), which has a number of poorly defined components with varying concentrations, hampers standardization of lymphocyte cultures. In order to develop a serum-free medium (SFM) for the expansion of human lymphocytes from peripheral blood mononuclear cells (PBMCs), a statistical optimization approach based on a fractional factorial method and a response surface method was adopted. A basal medium was prepared by supplementing RPMI1640 medium with insulin, albumin, ferric citrate, ethanolamine, fatty acids, glutamine, sodium pyruvate, 2-mercaptoethanol, 1-thioglycerol, nonessential amino acids, and vitamins. We identified additional positive determinants and their optimal concentrations for cell growth through a statistical analysis. Results From a statistical analysis using the fractional factorial method, cholesterol and polyamine supplement were identified as positive determinants for cell growth. Their optimal concentrations were determined by the response surface method. The maximum viable cell concentration in the developed SFM was enhanced by more than 1.5-fold when compared to that in RPMI1640 supplemented with 10% fetal bovine serum (FBS). Furthermore, a cytotoxicity assay and an enzyme-linked immunospot assay revealed that the effector function of cytotoxic T lymphocytes generated from PBMCs grown in SFM, by stimulation of peptide-presenting dendritic cells, was retained or even better than that in SCM. Conclusions The use of a developed SFM with cholesterol and polyamine supplement for human lymphocyte culture resulted in better growth without loss of cellular function when compared to SCM.</p
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