54,868 research outputs found
Cheung, S.-C, Kwan, P.-S., Kong Y.-C. Bencao yanjiu rumen (An Introduction to Pen-ts'ao Study)
No full textMétailié Georges. Cheung, S.-C, Kwan, P.-S., Kong Y.-C. Bencao yanjiu rumen (An Introduction to Pen-ts'ao Study). In: Journal d'agriculture traditionnelle et de botanique appliquée, 31ᵉ année, bulletin n°3-4, Juillet-décembre 1984. pp. 266-267
A wireless multimedia system
No full textThe complexity, robustness, image and speech quality as well as packet multiplexing issues of a reconfigurable multi-media mobile communicator are addressed. The proposed moderate complexity motion-compensated Discrete Cosine Transform (DCT) based image communicator provides an image peak signal-to-noise ratio (PSNR) of 38 dB at an average bit rate of about 25 kbits/s. The speech codec used is a low-complexity 32 kbit/s CCITT G721 standard scheme. Bandwidth efficient 16 or 64level quadrature amplitude modulation (QAM) combined with embedded low-complexity binary Bose-Chaudhuri-Hocquenghem (BCH) forward error correction coding is deployed. The 20-slot packet reservation multiple access (PRMA) scheme used supports an extra 2.4 kbit/s low-rate data channel for each speech user, in addition to providing 5-6 video-phone channels. The ADPCM/DCT/BCH/16-QAM as well as 64QAM schemes provide nearly unimpaired speech and image quality for channel SNRs in excess of 30 dB and 38 dB, respectively
Nitric oxide mediates the neuroproliferative effect of Neuropeptide Y
No full textNeuropeptide Y (NPY) is widely expressed in both the central and peripheral nervous system and has an important role in the regulation of adult hippocampal neurogenesis by mediating the proliferation of neural precursor cells in both health and disease. The mechanisms underlying this neuroproliferative effect of NPY, however, are unknown. The aim of this project was to investigate these cellular pathways and the possible involvement of nitric oxide (NO) in NPY-mediated neuroproliferation using postnatal rat hippocampal cultures in vitro. NPY was found to have a purely proliferative effect on hippocampal neural precursor cells. The role of NO was explored by inhibiting the NO synthesising enzyme, nitric oxide synthase (NOS), which abolished the proliferative effect of NPY and supported the involvement of NO in NPY-mediated proliferation. Pharmacological analyses using subtype-selective inhibitors suggested that the neuronal isoform of NOS is the sole NOS subtype involved, which was expressed by both nestin+ precursors and class III ?-tubulin+ neurons, the cell types previously shown to be responsive to NPY. The involvement of NO was further verified through loading hippocampal cells with an NO indicator, diaminofluorescein diacetate, where an increase in NO/N2O3 production was observed in nestin+ precursors and class III ?-tubulin+ neurons in response to NPY treatment. The downstream signalling pathways coupling NPY-mediated NO synthesis to cell proliferation were identified, through the use of selective pharmacological agonists and antagonists, as soluble guanylate cyclase, cGMP-dependent protein kinase (PKG) and the extracellular signal-regulated kinases (ERK) 1/2. By assessing levels of NPY-mediated ERK 1/2 phosphorylation in response to NOS inhibition, it was found that ERK 1/2 activation was mediated only via NOS/NO mechanisms. This proliferative cGMP-PKG-ERK 1/2 signalling cascade appears to be mediated by intracellularly released NO, while on the other hand, the addition of extracellular NO through the application of NO donors exerted an inhibitory effect on neural precursor cell proliferation. In addition to demonstrating the dual nature of NO, this is the first time that the signalling mechanisms underlying the proliferative effect of NPY on neural precursor cells have been described. Understanding the mechanisms underlying the proliferation of neural precursor cells will ultimately be beneficial by allowing the development of novel therapeutic interventions for promoting hippocampal neurogenesis.To analyse the role of NO in the NPY-mediated neuroproliferation of hippocampal cells in three-dimensional (3D) cultures, Laponite, a novel synthetic silica hydrogel, was used. Culture medium-based Laponite hydrogels were developed before cell viability within the hydrogels were assessed by culturing hippocampal monolayers under gel cover. Hydrogel cover, however, resulted in cell behaviour reminiscent of preservation/fixation as monolayers showed no spatial or morphological changes over time, with one possible explanation being the high gel osmolarity. Although attempts at cell seeding showed more positive results, with cells adhering to a low heavy metal content variation of the hydrogel, determination of cell viability remained a problem due to prominent dye-gel binding. Although the rheological properties of Laponite make its use attractive, the biocompatibility of the hydrogels with hippocampal cells still require further optimisation if they are to be used as cell culture matrices
An efficient protocol for private iris-code matching by means of garbled circuits
No full textBiometric-based access control is receiving increasing attention due to its security and ease-of-use. However, concerns are often raised regarding the protection of the privacy of enrolled users. Signal processing in the encrypted domain has been proposed as a viable solution to protect biometric templates and the privacy of the users. In particular, several solutions have been proposed to protect the privacy of the biometric probe during the authentication process. In this paper we focus on privacy-preserving iris-based authentication. The main innovations compared to the prior art include: i) an iris masking technique that simplifies the operations on the encrypted data without sacrificing the recognition rate; ii) the adoption of a matching protocol based only on garbled circuits which offers longer term security over existing solutions based on homomorphic encryption or hybrid techniques. The computational and communication complexity of the on-line phase of the proposed protocol is extremely low, thus opening the way to its exploitation in practical applications
A Review of silicon carbide development in MEMS applications
No full textDue to its desirable material properties, Silicon Carbide (SiC) hasbecome an alternative material to replace Si for MicroelectromechanicalSystems (MEMS) applications in harsh environments. To promote SiC MEMSdevelopment towards future cost-effective products, main technology areas inmaterial deposition and processes have attracted significant interest. Thedevelopments in these areas have contributed to the rapid emergence of SiCMEMS prototypes. In this paper, we give an overview of the importantdevelopments in SiC material formation and fabrication processes in recentyears. Some of the most interesting state-of-the-art SiC MEMS devices arereviewed. This highlights the major progresses in SiC MEMS developed thusfar. This paper also looks into the prospect of SiC MEMS drawing attention topotential issues
Historia de la muerte y glorioso martyrio del sancto Innocente, que llaman de la Guardia, natural de la ciudad de Toledo ... : con otros tractados de mucha doctrina y preouecho, que son los de la plana siguiente
No full textEl pie de imp. consta en colofón, en v. de h. 78 y de h. 96 de la primera secuencia de fol.Colofón en v. de h. 43 y de h. 88 de la segunda secuencia de fol.Sign.: ¶\p10\s, A-M\p8\s, ¶\p4\s ; A-L\p8\s, O\p3\s.Ports. con grab xil.Ilustraciones xil.Contiene: Tractado y platica de la ciudad de Toledo a sus vezinos afligidos .../author el maestro Alexio Venegas de Busto ; corregido por ... Rodrigo de Yepes ..., de h. 79 a 96 de la primera secuencia de fol. ; Tractado y descripcion breue y c¯opendiosa de la tierra sancta de Palestina ..., h. 1-43 de de la segunda secuencia de fol., con port. propia ; Tractado de la peregrinacion que Iesu Christo ... hizo en este mundo, h. 44-88 de la segunda secuencia de fol
sj-pdf-1-eae-10.1177_0958305X221146942 - Supplemental material for Light pollution impact assessment in Hong Kong: Multi-dimensional measurement and spatial numerical modelling on integrated light sources in the neighbourhood level
No full textSupplemental material, sj-pdf-1-eae-10.1177_0958305X221146942 for Light pollution impact assessment in Hong Kong: Multi-dimensional measurement and spatial numerical modelling on integrated light sources in the neighbourhood level by Jimmy C K Tong, X H Yao, Edmond S L Lau, Wendy K S Cheung, Kingston K S Ho, Venus Y Y Ng and Arthur P S Lau in Energy & Environment</p
High-Sensitivity Cardiac Troponin I Following Gender-Affirming Hormone Therapy in Transgender Adults
No full textResearch LetterAbstract not availableAda S. Cheung, Ingrid Bretherton, Shalem Y. Leemaqz, Sathya Perera Wedithanthrige, Leah Singh, Cherie Chian
Spatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
Nonstrangulating small colon obstruction caused by a submucosal haematoma
No full textS. Stahel, C. B. Riley, M. Wichtel and P.-Y. Daous
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