6,256 research outputs found
Lowest electronic states of neutral and ionic LiN
No full textWe have investigated the potential energy curves (PECs) of the LiN heteronuclear diatomic molecule, including its ionic species LiN+ and LiN−, using explicitly correlated multi-reference configuration interaction (MRCI-F12) calculations in conjunction with the correlation consistent quintuple- basis set. The effect of core–valence correlation, scalar relativistic effects, and the size of the basis sets has been investigated. A comprehensive set of spectroscopic constants determined based on the above-mentioned calculations are also reported for the lowest electronic states and all systems, including dissociation energies, harmonic and anharmonic vibrational frequencies, and rotational constants. Additional parameters, such as the dipole moments, equilibrium spin-orbit constants, excitation energies, and rovibrational energy levels, are also documented. We found that the three triplet states of LiN, namely, X 3∑−, A 3Π, and 2 3∑−, exhibit substantial potential wells in the PEC diagrams, while the quintet states are repulsive in nature. The ground state of the anion also shows a deep potential well in the vicinity of its equilibrium geometry. In contrast, the ground and excited states of the cation are very loosely bound. Charge transfer properties of each of these states are also analyzed to obtain an in-depth understanding of the interatomic interactions. We found that the core–valence correlation has a substantial effect on the calculated spectroscopic constants.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Atmospheric Remote Sensin
Radio resource allocation in relay based OFDMA cellular networks
No full textPhDAdding relay stations (RS) between the base station (BS) and the mobile stations (MS) in a cellular system can extend network coverage, overcome multi-path fading and increase the capacity of the system.
This thesis considers the radio resource allocation scheme in relay based cellular networks to ensure high-speed and reliable communication. The goal of this research is to investigate user fairness, system throughput and power consumption in wireless relay networks through considering how best to manage the radio resource.
This thesis proposes a two-hop proportional fairness (THPF) scheduling scheme fair allocation, which is considered both in the first time subslot between direct link users and relay stations, and the second time subslot among relay link users.
A load based relay selection algorithm is also proposed for a fair resource allocation. The transmission mode (direct transmission mode or relay transmission mode) of each user will be adjusted based on the load of the transmission node.
Power allocation is very important for resource efficiency and system performance improvement and this thesis proposes a two-hop power allocation algorithm for energy efficiency, which adjusts the transmission power of the BS and RSs to make the data rate on the two hop links of one RS match each other.
The power allocation problem of multiple cells with inter-cell interference is studied. A new multi-cell power allocation scheme is proposed from non-cooperative game theory; this coordinates the inter-cell interference and operates in a distributed manner. The utility function can be designed for throughput improvement and user fairness respectively.
Finally, the proposed algorithms in this thesis are combined, and the system performance is evaluated. The joint radio resource allocation algorithm can achieve a very good tradeoff between throughput and user fairness, and also can significantly improve energy efficiency
Tsounkranaglenea Lin & Ge 2021, gen. nov.
No full textTsounkranaglenea gen. nov. Type species: Tsounkranaglenea hefferni sp. nov. Diagnosis. It is mostly similar to Glenea by the lateral elytral carinae and truncate elytral apex, but can be distinguished by the elongated, bended and rake-shaped sternite VII. In fact, it differs from all other saperdine genera by the peculiar sternite VII in males. It also differs from Paraglenea Bates, 1866, Heteroglenea Gahan, 1897 (as defined in Lin, Montreuil et al, 2009) and Pareutetrapha Breuning, 1952 by the male claws of fore and hind legs simple instead of appendiculate or bifid and elytral apex truncated with sharp teeth instead of rounded or slightly truncated without sharp teeth. It also differs from Eumecocera Solsky, 1871 and Stenostola Dejean, 1835 by the elytra with lateral carinae and male claws of fore and hind legs simple instead of appendiculate or bifid. The combination of the following characters makes the new genus easily separable from other saperdine genera: prothorax without lateral tubercles, elytra with distinct lateral carinae, elytral apex truncated with long spines at outer angle, male claws with appendiculated tooth only in mesotarsi and female claws all simple, male sternite VII elongated and bended into a rake-shape. Description. Small-sized (under 15 mm). Head not broader than prothorax. Eyes deeply emarginate, not divided, lower eye lobe much vertically longer than (male) to subequal to (female) gena. Antennae longer than body, in male slightly longer than female, basal segments fringed with sparse setae, scape slightly expanded, second antennomere short, third antennomere always the longest, 4 th antennomere subequal to (female) to slightly longer than (male) scape, 4 th to 10 th slightly and gradually decreasing in length except 11 th being slightly longer than 10 th. Prothorax cylindrical, without lateral tubercles, slightly narrowed around basal fifth. Elytra subparallel, truncated apically, with sharp teeth at both inner and outer angles, each with two distinct lateral carinae starting from the base and combined into apical outer tooth (Figs 1b, 11b). Procoxal cavity closed posteriorly (Fig. 11c), mesocoxal cavity open to mesepimeron, metanepisternum more than twice as wide anteriorly as posteriorly. Protarsi with first segment expanded in male (Fig. 1a), mesotibiae with an oblique groove with setae (Fig. 1b), hind femur reaching fifth abdominal segment, hind tarsi with first segment longer than the following two combined. Male claws: only anterior claws of mesotarsi appendiculate with small teeth (Figs. 4–5), posterior claws of mesotarsi without teeth, and claws of pro- and metatarsi simple. Females claws simple (Figs. 11 a-11b). Male sternite VII elongated and bent into a rake-shape (Figs. 1–3), female sternite VII with a median groove (Fig. 11c). Male terminalia. Apex of male tergite VIII emarginated (Figs. 6a–6c). Lateral lobes slender, with a strong tooth at ventral base (Fig. 8b); ringed part elbowed in the widest portion, converging; basal piece well-developed and bifurcated (Fig. 8c). Median lobe strongly curved, shorter than tegmen, dorsal plate shorter than ventral plate, apex of ventral plate emarginated (Fig. 9a). Median foramen not elongated. Endophallus with one band of supporting armature, 4 basal plate-like sclerites, and 3 rod-like sclerites. Ejaculatory duct single. Female terminalia: Setae of sternite VIII dense and long. Spermathecal capsule and gland positioned on apex of spermathecal duct. Spermathecal capsule strongly sclerotized, composed of an apical orb and a long stalk, spiculum ventrale longer than abdomen. Etymology. The generic name is a combination of a Greek word tsounkrána (τσουγκράνα) and the genus name Glenea. The Greek word “tsounkrána” refers to the shape of sternite VII in male, which looks like a rake. Gender feminine. Distribution. Malaysia. Remarks. It is very similar to Glenea (Breuning, 1956; Breuning, 1958) by the elytral lateral carinae and truncated elytral apex, and the following characters are quite common in Glenea members: endophallus with 4 basal plate-like sclerites (Lin et al., 2009; Lin, Tavakilian et al., 2009a,b; Lin & Lin, 2011; Lin & Yang, 2011a, b; Lin et al., 2018), and 3 rod-like sclerites (Lin et al., 2009; Lin, Tavakilian et al., 2009a,b; Lin & Lin, 2011; Lin & Yang, 2011a, b; Lin & Dai, 2012; Lin, 2013); spermathecal capsule strongly sclerotized, composed of an apical orb and a long stalk (Lin et al., 2009; Lin, Tavakilian et al., 2009b; Lin & Yang, 2011a, b; Lin & Dai, 2012). We separate it from Glenea based on the following reasons.: 1) Glenea is heterogeneous (Lin, Montreuil et al., 2009;), even though outer characters are very similar (Lin & Tavakilian, 2012), this peculiar species does not match with any type species of the subgenera; 2) Though most of characters can be found in the previous Glenea members, and the peculiar male sternite might not be suitable for generic level, but with only one band of supporting armature and the emarginated apex of the ventral plate of the median lobe, this convinced the authors to make a new genus. Most members of Saperdini have zero or two bands of supporting armature, rounded to the pointed apex of the ventral plate of the median lobe (Lin et al., 2009; Lin, Tavakilian et al., 2009a, b; Lin & Yang, 2011a, b; Lin & Dai, 2012; Lin, 2013; Lin et al., 2018). 3) Although the sexual dimorphism (on pubescence markings) referred to the subgenus Glenea (Acutoglenea) Breuning, 1958, and the dark integument referred especially to G. (A.) versuta basaloides Breuning 1958, G. (A.) versuta maura Pascoe, 1867, it can not be included in the subgenus Acutoglenea because of the non-simple male claws and very different male terminalia (based on the first author’s unpublished data). Besides, the type species Glenea (Acutoglenea) acuta (Fabricius, 1801) has a stouter female, with elytral length less than twice basal width, fourth antennomere much shorter than scape, which are very different from the new taxon herein described. 4) We have checked the subgenus Glenea (Lineatoglenea) Breuning, 1950, which is represented by a unique type species Glenea (Lineatoglenea) lineatopunctata Breuning, 1950 from Malaysian Borneo. There are no images available, and we did not have an opportunity to examine the type specimen which should be deposited in University of Malaysia, Sarawak (Breuning, 1950a). Based on the original description, it shares with the new taxon by antennae longer than body, similar antennomere ratio, pronotum and elytra, however it differs from the new taxon by the fifth male abdominal segment provided at the end with a short median longitudinal ridge. 5) We have checked the subgenus Glenea (Spiniglenea) Breuning, 1958, which is represented by a unique type species Glenea (Spiniglenea) spinosipennis Breuning, 1958 from Malaysian Borneo. It also has no images available, and we did not have an opportunity to examine the type specimen which should be deposited in University of Malaysia, Sarawak (Breuning, 1958b). Based on the original description, it is difficult to separated it from the new taxon on genus level, since it was based only on a female. However, it is surely not the same species. 6) We compared the new taxon with Glenea (Metaglenea) Breuning, 1956, which is represented by a species from Sumatra, and Glenea (Porphyrioglenea) Breuning, 1956, which is represented by a species from West Malaysia and Sabah, East Malaysia. They can be easily distinguished from the new taxon by the very close antennal tubercles, shorter and stouter antennae. Glenea (Pseudotanylecta) Breuning, 1956, Glenea (Subgrossoglenea) Breuning, 1956, Glenea (Tanylecta) Pascoe, 1866 also from Malaysia and Indonesia, can be separated by the close and protruding antennal tubercles. 7) Glenea (Poeciloglenea) Aurivillius, 1920, Glenea (Punctoglenea) Breuning, 1956, Glenea (Reginoglenea) Breuning, 1956, Glenea (Rubroglenea) Breuning, 1956, Glenea (Rufoglenea) Breuning, 1956, Glenea (Stiroglenea) Aurivillius, 1920, Glenea (Vanikoroglenea) Breuning, 1956, Glenea (Vittiglenea) Breuning, 1956, Glenea (Volumnia) Thomson, 1860 and all other subgenera have been studied by the first author, and none of them are suitable for the new taxon. 8) The new taxon differs from Glenea (Lobunguiglenea) Lin & Tavakilian, 2014 by the male claws with only anterior claw of mesotarsus appendiculate with small lobe in inner side, instead of all claws appenciculated in outer sides, and genitalia with median lobe strongly curved, apex of ventral plate emarginated, instead of genitalia with median lobe slightly curved, apex of ventral plate pointed.Published as part of Lin, Mei-Ying & Ge, Si-Qin, 2021, Tsounkranaglenea hefferni gen. et sp. nov. from Sabah, Malaysia (Coleoptera Cerambycidae, Lamiinae: Saperdini), pp. 289-297 in Zootaxa 5048 (2) on page 290, DOI: 10.11646/zootaxa.5048.2.9, http://zenodo.org/record/555211
Vascular endothelial growth factor restores delayed tumor progression in tumors depleted of macrophages
No full textGenetic depletion of macrophages in Polyoma Middle T oncoprotein (PyMT)-induced mammary tumors in mice delayed the angiogenic switch and the progression to malignancy. To determine whether vascular endothelial growth factor A (VEGF-A) produced by tumor-associated macrophages regulated the onset of the angiogenic switch, a genetic approach was used to restore expression of VEGF-A into tumors at the benign stages. This stimulated formation of a high-density vessel network and in macrophage-depleted mice, was followed by accelerated tumor progression. The expression of VEGF-A led to a massive infiltration into the tumor of leukocytes that were mostly macrophages. This study suggests that macrophage-produced VEGF regulates malignant progression through stimulating tumor angiogenesis, leukocytic infiltration and tumor cell invasion
Pharmacological therapies for monogenic obesity caused by MC4R dysfunction
No full textPhDMutations in the melanocortin-4 receptor (MC4R) are the most common cause of monogenic obesity. The majority of MC4R mutations are predicted to cause the receptor to aberrantly fold. Misfolded MC4R fails to traffic to the plasma membrane (PM) and is retained in the endoplasmic reticulum (ER). Recent studies with other G-protein coupled receptors have shown that stabilisation of misfolded receptor, by pharmacological chaperones, promotes trafficking to the cell surface where the receptor may be functional. The objective of this thesis was to develop a rapid throughput cell culture based assay to monitor MC4R trafficking to the PM and to screen chemical chaperones and inducers and inhibitors of endogenous molecular chaperones, for the ability to promote folding and cell surface expression of mutant MC4R.
The work presented here confirmed that clinically occurring MC4R mutants S58C, N62S, P78L, D90N, L106P, C271Y and P299H are intracellularly retained in HEK 293 cells. The cell culture assay was used to screen a number of compounds, which have been previously reported to act as chemical chaperones by stabilising protein folding. Treatment with 4-phenyl butyric acid (4-PBA) and trehalose increased total cellular levels of wild-type and mutant MC4R. The benzoquinone ansamycin, geldanamycin, has been identified as a potent inhibitor of Hsp90 activity and an inducer of the heat shock response. Geldanamycin treatment altered the cell surface expression of wild-type and mutant MC4R. Furthermore, over expression of Hsp90 co-chaperone Aha1, also effected MC4R processing. Over-expression of Hsp70 has been shown to promote the trafficking of other aberrantly folded proteins. Over-expression of Hsc70 increased trafficking levels of wild-type and mutant MC4R and promoted mutant MC4R functional expression. In conclusion this data suggests using compounds that stabilise protein folding and/or targeting endogenous molecular chaperone machineries may have efficacy for altering cell surface expression of mutant MC4R
Child health beyond 1990: Queen Mary Hospital.
No full textpublished_or_final_versionForward Yeung, C.Y. Yeung, C.Y. 5Photographs of the scientific meeting and commissioning of the new paediatric wards in Queen Mary Hospital 9Proceedings of the scientific meetingStaff of the department of paediatrics, University of Hong Kong 129Acknowledgements 135Programme of the scientific meeting 17Opening lecture: recent advances in the therapy of childhood asthma Chernick, Victor Chernick, Victor 23Plenary lectures 31Symposium I 41Symposium IISymposium IIISymposium IVPostersSurfactant replacement therapy for RDS Chernick, Victor Chernick, Victor 32Adolescent medicine-pediatrics preparing for the 21st century MacKenzie, Richard G. MacKenzie, Richard G. 38The aetiology of pneumonia in children Shann, Frank Shann, Frank 39Resurgence of rheumatic fever in children Lue, Hung-chi Lue, Hung-chi 42Is asymptomatic bronchial hyperresponsiveness an indication of potential asthma? Zhong, Nan-shan Zhong, Nan-shan Chen, R.C. Chen, R.C. Ou-Yung, M. Ou-Yung, M. Wu, Z.Y. Wu, Z.Y. Zhen, J.P. Zhen, J.P. Li, Y.F. Li, Y.F. 48Lactose malabsorption in Chinese children Yeung, Chap- yung Yeung, Chap-yung Wong, Francis Wong, Francis Tam, Yat-cheung, Alfred Tam, Yat-cheung, Alfred 53New antibiotics for use in children Shann, Frank Shann, Frank 57Interferon and tumor necrosis factor in th pathogenesis of human immunodeficiency virus infection Lau, Allan S. Lau, Allan S. 59Infections in primary immunodeficiencies Lau, Y.L. Lau, Y.L. Low, L. Low, L. Samuda, G. Samuda, G. Wong, S.N. Wong, S.N. Chow, C.B. Chow, C.B. 66Study on hepatitis B vaccine - six yeras follow-up Duan, Shu-cheng Duan, Shu-cheng Zhu, Qi-yong Zhu, Qi-yong Xu, Hua-fang Xu, Hua-fang Xu, Zhi-yi Xu, Zhi-yi 67Hepatitis B - efficacies of vaccination Wu, Tzee-chung Wu, Tzee-chung Lo, Kwang-juei Lo, Kwang-juei Lee, Shou-dong Lee, Shou-dong Tsai, Yang-te Tsai, Yang-te 73Changing pattern of childhood asthma in Taiwan Hsieh, Kue-hsiung Hsieh, Kue-hsiung 74A ten-year nation-wide survey of hospitalized children with wheezing in China Chen, Yu-zhi Chen, Yu-zhi 75Experimental study on surfactant replacement therapy in animal models Dong, S.H. Dong, S.H. Wang, Z.D. Wang, Z.D. Wang, Z.H. Wang, Z.H. Song, G.W. Song, G.W. Wang, H. Wang, H. Gan, X.Z. Gan, X.Z. Ma, L.H. Ma, L.H. Lin, J.Z. Lin, J.Z. Liu, D. Liu, D. Hu, S.S. Hu, S.S. 77The incidence and epidemiology of congenital heart disease in Shanghai Liu, Wei-ting Liu, Wei-ting Hua, Bang-jie Hua, Bang-jie Chou, Shi-yu Chou, Shi-yu Ning, Shou-bao Ning, Shou-bao Cheng, Yin-tai Cheng, Yin-tai Guo, An-lin Guo, An-lin 84Paediatric angioplasty and valvuloplasty in Hong Kong Lo, Roxy N.S. Lo, Roxy N.S. Leung, Maurice P. Leung, Maurice P. Lau, C.K. Lau, C.K. 85Oriental ventricular septal defect Lau, Kai-chiu Lau, Kai-chiu Lo, Roxy N.S. Lo, Roxy N.S. Leung, Maurice P. Leung, Maurice P. 86Apnea in infancy and childhood Chernick, Victor Chernick, Victor 93Infection in intensive care Shann, Frank Shann, Frank 105Developmental dynamics of the teenager MacKenzie, R.G. MacKenzie, R.G. 105Unsustained sexual precocity Low, L. Low, L. Leung, A. Leung, A. Wang, C. Wang, C. 106Depression in Hong Kong children suffering from thalassaemia major Chung, S.Y. Chung, S.Y. Li, A.M.C. Li, A.M.C. Cheung, A.W.W. Cheung, A.M.W. 106Physical fitness in Hong Kong children Ip, Henrietta M.H. Ip, Henrietta M.H. Chan, C.W. Chan, C.W. Lam, P. Lam, P. Ng Fong, S.M. Ng Fong, S.M. Au-Yeung, H. Au- Yeung, H. 107Congenital nephrotic syndrome (CNS): diagnosis, pathogenesis and results of renal transplantation Vernier, Robert L. Vernier, Robert L. 107Acid-base disorders in renal diseases Nimi, Kazuhiko Nimi, Kazuhiko Hanna, James D. Hanna, James, D. Santos, Fernando Santos, Fernando Chan, James C.M. Chan, James C.M. 108Two decades of bone marrow transplant (BMT) - review of published results Cheng, M.Y. Cheng, M.Y. 116An unusual cause of scoliosis and leg length discrepancy Goh, W. Goh, W. Ng, T. Ng, T. Fung, C.F. Fung, C.F. Wong, V. Wong, V. 118The outcome of premature infants Goh, W. Goh, W. Wong, V. Wong, V. Wong, K.Y. Wong, K.Y. 118A clinical documentation of paediatric gait Chan Bacon- Shone, Vivian Chan Bacon-Shone, Vivian 119Brainstem evoked potential study in chidren with autistic disorder Wong, V. Wong, V. Wong, S.N. Wong, S.N. 119Outcome of baby with severe birth asphyxia Lam, B. Lam, B. 120Neonatal hyperbilirubinemia in China Guan, Xiji Guan, Xiji 120Clinical genetic disorders in Taiwan Wang, Tso-ren Wang, Tso-ren 121Mutational analysis of duchenne/becker muscular dystrophy (DMD/BMD) Lau, Y.L. Lau, Y.L. Srivastava, G. Srivastava, G. Wong, V. Wong, V. Fu, K.H. Fu, K.H. Ho, F. Ho, F. Yeung, C.Y. Yeung, C.Y. 121A review of multiple congenital anomaly syndromes in Hong Kong Lam, S.T.S. Lam, S.T.S. Chau, A.S. Chau, A.S. 122Air pollution, respiratory symptoms and asthma in children of Hong Kong Hedley, A.J. Hedley, A.J. Tam, A. Tam, A. Liu, J. Liu, J. Wong, C.M. Wong, C.M. Chan, J. Chan, J. Lam, T.H. Lam, T.H. Ong, S.G. Ong, S.G. 122A study on the use of volmax in childhood Jiang, Zaifang Jiang, Zaifang 123Surfactant replacement therapy in Rds Sheng, Huan-dong Sheng, Huan-dong Hui, Qin-song Hui, Qin-song Gen, Fu- cao Gen, Fu-cao 124Haematological findings on ..-thalassaemia trait in Hong Kong Chinese Li, A.M.C. Li, A.M.C. 126Cord blood immunoglobulin and complement levels in premature and term newborns in Hong Kong Tam, A. Tam, A. Wong, H.N. Wong, H.N. Tang, T.S. Tang, T.S. Yeung, C.Y. Yeung, C.Y. 126Abnormal renal and splanchnic arterial doppler pattern in premature babies with symptomatic patient ductus arteriosus Wong, sik-nin Wong, Sik-nin Lo, Nogk-sing, Roxy Lo, Nogk-sing, Roxy Hui, Ping-wai Hui, Ping-wai 127Sonographic findings in infants with purulent meningitis Gu, Lai-lai Gu, Lai-lai Zhu, Hui-yi Zhu, Hui-yi 127A study of cell-mediated immunity in histiocytosis X Hu, Yamei Hu, Yamei 128Serum immunoglobulin concentrations in healthy Chinese children Lau, Y.L. Lau, Y.L. Jones, B. Jones, B. Yeung, C.Y. Yeung, C.Y. 12
The viscoelastic properties of rubber under a complex loading
No full textPhDThis thesis aims to explore the effect of pre-strain on the viscoelastic behaviour of
rubber materials. There are various conflicting theories in the literature regarding the
strain dependence and resulting anisotropy of the viscoelastic behaviour. This thesis
seeks to measure the behaviour and to study the possibility of using Finite Element
Analysis (FEA) to predict the static behaviour of a rubber cylinder in combined
torsion-tension and also the viscoelastic behaviour of rubber under various complex
loadings using a Bergstrom-Boyce model1-4.
To measure the induced anisotropy, a rubber test piece is subjected to a simple
extension l and then it is subjected to small strain oscillations in the direction of the
pre-extension or in shear. These two different deformations will allow the extent of
the anisotropy in the viscoelastic behaviour induced by the pre-extension to be
measured. Kuhn and Kunzle5 found that the loss factor resulting from a small
oscillation decreased as a function of the static pre-strain. They and many others have
interpreted this as a lowering of internal viscosity due to chain orientation. However,
a simple analysis shows that this effect is due to geometric changes alone and that the
essential viscoelastic behaviour expressed in terms of the deformed dimension after
the application of the pre-strain as the loss modulus for an unfilled rubber is constant
with strain up to an extension ratio of 2. It is also isotropic in behaviour for filled
rubber compounds such as carbon black. For fumed silica filled rubber, the picture is
more complex. For a moderately carbon black (25 phr) filled rubber, the loss
modulus is still independent of the pre-strain for normal working strains but at highly
filler contents (above 50 phr), the loss modulus increases with pre-strain at extension
ratios somewhat less than 2. With silica, the coupling agent dominates the
viscoelastic behaviour. For filled rubber, the change in loss modulus with strain can
in part be explained by strain amplification, slippage of rubber around the filler, and
shape factor effects. This approach can help to further understand the mechanism of
filler reinforcement in rubber materials.
Another complex loading is also used to validate these results with a static pure shear
superimposed with simple shear oscillation. The results confirm the loss modulus is independent of the pre-strain for unfilled rubber and lightly filled rubber but for the
most highly filled rubber, the test is unsuitable as the smallest oscillating strains were
too great for linear viscoelastic behaviour.
The Finite Element Analysis (FEA) shows that a rubber cylinder in combined
torsion-tension test can be modelled accurately as an elastic component provided that
the appropriate strain energy function (SEF) and geometry are used in the model. The
correct torque and the second order effect whereby a reduction in the axial force
resulting from the torsion of a pre-strained rod can both be accurately represented.
The viscoelastic behaviour under various complex loadings was modelled using the
Bergstrom and Boyce model1. The results show that this model can predict behaviour
for uniaxial but in a complex loading the model was inappropriate
A First- and Second-Order Motion Energy Analysis of Peripheral Motion Illusions Leads to Further Evidence of “Feature Blur” in Peripheral Vision
No full textAnatomical and physiological differences between the central and peripheral visual systems are well documented. Recent findings have suggested that vision in the periphery is not just a scaled version of foveal vision, but rather is relatively poor at representing spatial and temporal phase and other visual features. Shapiro, Lu, Huang, Knight, and Ennis (2010) have recently examined a motion stimulus (the “curveball illusion”) in which the shift from foveal to peripheral viewing results in a dramatic spatial/temporal discontinuity. Here, we apply a similar analysis to a range of other spatial/temporal configurations that create perceptual conflict between foveal and peripheral vision.To elucidate how the differences between foveal and peripheral vision affect super-threshold vision, we created a series of complex visual displays that contain opposing sources of motion information. The displays (referred to as the peripheral escalator illusion, peripheral acceleration and deceleration illusions, rotating reversals illusion, and disappearing squares illusion) create dramatically different perceptions when viewed foveally versus peripherally. We compute the first-order and second-order directional motion energy available in the displays using a three-dimensional Fourier analysis in the (x, y, t) space. The peripheral escalator, acceleration and deceleration illusions and rotating reversals illusion all show a similar trend: in the fovea, the first-order motion energy and second-order motion energy can be perceptually separated from each other; in the periphery, the perception seems to correspond to a combination of the multiple sources of motion information. The disappearing squares illusion shows that the ability to assemble the features of Kanisza squares becomes slower in the periphery.The results lead us to hypothesize “feature blur” in the periphery (i.e., the peripheral visual system combines features that the foveal visual system can separate). Feature blur is of general importance because humans are frequently bringing the information in the periphery to the fovea and vice versa
Comment on Chen and Lin “Does downloading Powerpoint slides before the lecture lead to better student achievement?â€
No full textChen and Lin (2008) is an interesting attempt to measure the effect of students having access to PowerPoint slides before a lecture. They argue that such access leads to better learning outcomes as measured by higher exam marks. While their empirical results shed some light on students’ use of PowerPoint slides, I argue that they have not succeeded in isolating the treatment effect and the correlations cannot be interpreted as causal.
Author Co-Citation Analysis (ACA): a powerful tool for representing implicit knowledge of scholar knowledge workers
No full textIn the last decade, knowledge has emerged as one of the most important and valuable organizational assets. Gradually this importance caused to emergence of new discipline entitled ―knowledge management‖. However one of the major challenges of knowledge management is conversion implicit or tacit knowledge to explicit knowledge. Thus Making knowledge visible so that it can be better accessed, discussed, valued or generally managed is a long-standing objective in knowledge management. Accordingly in this paper author co- citation analysis (ACA) will be proposed as an efficient technique of knowledge visualization in academia (Scholar knowledge workers)
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