2,619 research outputs found
Hypophthalmichthys molitrix
No full textHypophthalmichthys molitrix (Valenciennes) (Fig. 12, [LU]) Distribution. Shing Mun River, Sandy Ridge Cemetery (Chan, 2001); Kam Tin River (A.C. Lam, pers. comm., 2015); Tai Lam Chung Reservoir (AFCD, 2021c); Ng Tung River, Sheung Yue River (GBIF.org, 2021); Pak Ngau Shek Stream (current survey). Native range. China and Vietnam (East Asia). Remarks. Juveniles are regularly stocked (suspected to be from aquaculture) in (unspecified) reservoirs to control algae as they are believed to be incapable of reproducing in Hong Kong’s fresh waters (WSD, 2019).Published as part of Chan, Jeffery C. F., Tsang, Alphonse H. F., Yau, Sze-man, Hui, Tommy C. H., Lau, Anthony, Tan, Heok Hui, Low, Bi Wei, Dudgeon, David & Liew, Jia Huan, 2023, The non-native freshwater fishes of Hong Kong: diversity, distributions, and origins, pp. 128-168 in Raffles Bulletin of Zoology 71 on page 137, DOI: 10.26107/RBZ-2023-0012, http://zenodo.org/record/781576
Characteristics of nonmethane hydrocarbons (NMHCs) in industrial, industrial-urban, and industrial-suburban atmospheres of the Pearl River Delta (PRD) region of south China
No full textAuthor name used in this publication: Chan, Lo-Yin.Author name used in this publication: Chan, Chuen-Yu.2005-2006 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Channa striata
No full textChanna striata (Bloch) (Fig. 24, [LU]) Distribution. Lin Ma Hang Stream, Sha Ling area (Chan, 2001); Tai Tong area (Chan, 2001; Ove Arup & Partners Hong Kong Limited, 2017); Man Uk Pin Stream (Black & Veatch Hong Kong Limited, 2007); Wo Shang Wai area (Mott Connell Limited, 2008); Lok Ma Chau Loop, Ho Hok Wai area (Ove Arup & Partners Hong Kong Limited, 2013a); Ma Wat River, Fung Kong Stream, Tsung Yuen Stream, Long Valley area (Ove Arup & Partners Hong Kong Limited, 2013b); Fung Lok Wai area (CH 2M HILL Hong Kong Limited, 2008); Ping Kong Stream, Ma Tso Lung Stream (DSD, 2021); Pui O Stream, Mai Po area, Pak Tam Chung Stream, Tai O area, Ng Tung River, San Tin area, Sheung Yue River, Ha Shan Kai Wat area, Sandy Ridge Cemetery, Shui Lo Cho Stream, Shan Pui River (GBIF.org, 2021); Pak Long Stream (Tsang & Dudgeon, 2021a); Kam Tin River, Wetland Park, Nam Sang Wai area, Tsing Tai Stream, Yuen Long Bypass Floodway, Mui Wo area, Yi O Stream (current survey). Native range. South China to (Southeast Asia) and South Asia. Remarks. Abundant and widespread in the northern New Territories; sought-after by anglers.Published as part of Chan, Jeffery C. F., Tsang, Alphonse H. F., Yau, Sze-man, Hui, Tommy C. H., Lau, Anthony, Tan, Heok Hui, Low, Bi Wei, Dudgeon, David & Liew, Jia Huan, 2023, The non-native freshwater fishes of Hong Kong: diversity, distributions, and origins, pp. 128-168 in Raffles Bulletin of Zoology 71 on page 142, DOI: 10.26107/RBZ-2023-0012, http://zenodo.org/record/781576
Noise correlation between eigenvalues in nonlinear frequency division multiplexing
No full textAlso part published in Optics InfoBase Conference Papers.
Part F6-BGPP 2016. Paper JM6A.13 (OSA Technical Digest). JM6A - Joint Poster Session IThe noise effects on signals with multiple eigenvalues is studied numerically. Correlations between the noise of the eigenvalues are discovered for the first time, which allows a more compact pack of signal points.Wen Qi Zhang, Qun Zhang, Kashif Amir, Tao Gui, Xuebing Zhang, Alan Pak Tao Lau, Chao Lu, Terence H. Chan, and Shahraam Afshar V
Pertussis toxin-sensitive cholinergic inhibition of somatostatin release from canine D-cells
No full textDevelopment of an enriched cultured cell system allowed us to investigate the mechanism of cholinergic inhibition of somatostatin release stimulated by adenosine 3',5'-cyclic monophosphate (cAMP) and Ca2+-protein kinase C-dependent pathways of cell activation. After a 24-h culture on rat tail collagen, D-cells, quantified by immunohistochemistry, were 18-fold enriched compared with unelutriated dispersed cells. Somatostatin release from cultured cells was expressed as a percent of the somatostatin released by a specific stimulus in control cells. Under basal conditions release of somatostatin was 2.3 +/- 0.6% of the total cell content. Epinephrine (1 microM) and cholecystokinin octapeptide (10 nM) increased somatostatin release to 6.98 +/- 1.25 and 10.72 +/- 1.64%, respectively. Carbachol (1 microM) completely inhibited somatostatin release stimulated by epinephrine and reduced cholecystokinin octapeptide-stimulated release to 75% of control levels. Carbachol inhibition of the response to both epinephrine and cholecystokinin octapeptide was totally prevented by 5 h of treatment of the cells with pertussis toxin (300 ng/ml). Somatostatin release in response to the diterpene forskolin (10 microM), dibutyryl cAMP (300 microM), the phorbol ester beta-phorbol 12-myristate 13-acetate (0.1 microM), and the calcium ionophore A23187 (1 microM) was also inhibited by carbachol and prevented by pertussis toxin pretreatment. The ADP-ribosylase inhibitor isonicotinamide (1 mM) selectively blocked the effect of pertussis toxin without altering other stimulatory or inhibitory responses. These data are consistent with the view that carbachol inhibits somatostatin release at guanyl nucleotide-binding protein and/or another pertussis toxin-sensitive site.LR: 20061115; PUBM: Print; JID: 0370511; 0 (Virulence Factors, Bordetella); 16561-29-8 (Tetradecanoylphorbol Acetate); 25126-32-3 (Sincalide); 362-74-3 (Bucladesine); 51-43-4 (Epinephrine); 51-83-2 (Carbachol); 51110-01-1 (Somatostatin); 52665-69-7 (Calcimycin); 66428-89-5 (Forskolin); EC 2.4.2.31 (Pertussis Toxin); ppublishSource type: Electronic(1
Pelmatolapia mariae
No full text<i>Pelmatolapia mariae</i> (Boulenger) <p> <b>Distribution.</b> Tai Lam Chung Reservoir (AFCD, 2021c); Pak Ngan Heung Stream (DSD, 2021); Ting Kok area (GBIF. org, 2021; current survey).</p> <p> <b>Native range.</b> Africa.</p>Published as part of <i>Chan, Jeffery C. F., Tsang, Alphonse H. F., Yau, Sze-man, Hui, Tommy C. H., Lau, Anthony, Tan, Heok Hui, Low, Bi Wei, Dudgeon, David & Liew, Jia Huan, 2023, The non-native freshwater fishes of Hong Kong: diversity, distributions, and origins, pp. 128-168 in Raffles Bulletin of Zoology 71</i> on page 147, DOI: 10.26107/RBZ-2023-0012, <a href="http://zenodo.org/record/7815765">http://zenodo.org/record/7815765</a>
Tagging of Biomedical Articles on CiteULike: A Comparison of User, Author and Professional Indexing
No full textThis paper examines the context of online indexing from the viewpoint of three different groups: users, authors, and professional indexers. User tags, author keywords and descriptors were collected from academic journal articles, which were both indexed in Pubmed and tagged on CiteULike, and analysed. Descriptive statistics, informetric measures, and thesaural term comparison shows that there are important differences in the use of keywords between the three groups in addition to similarities which can be used to enhance support for search and browse. While tags and author keywords were found that matched descriptors exactly, other terms which did not match but provided important expansion to the indexing lexicon were found. These additional terms could be used to enhance support for searching and browsing in article databases as well as to provide invaluable data for entry vocabulary and emergent terminology for regular updates to indexing systems. Additionally, the study suggests that tags support organisation by association to task, projects and subject while making important connections to traditional systems which classify into subject categories
A two-stage h.264 based video compression method for automotive cameras
No full textWith the development of automated vehicles and advanced driver assistance systems, the compression of the large amount of data generated by the vehicle camera sensors becomes a necessary processing step to improve the automated driving system efficiency. H.264 is a widely adopted video compression scheme, and it has been designed for human vision. Rate control in H.264 uses fixed quantisation parameter, however, this process can lead to fluctuation in different regions of the image quality of each frame. In this paper, we propose a two-stageH.264 based video compression framework, named “Two Stage Compression (TSC)”, to compress the automotive camera videos with different values of compression rate in different regions of each frame. In the first stage, each frame will be divided into the region-of-interest and the region-out-of-interest. In the second- stage, different compression ratios will be applied based on the importance of the region. The experimental results show that under the same overall compression ratio, our proposed TSC increments the semantic-aware PSNR by 3.213 dB compared to uniform H.264 compression. Our method is also compared to uniform H.264 compression using a segmentation algorithm, with an improvement of 1.77% in mIOU, the average Intersection over- Unio
An ultra low-power precision sample-and-hold circuit for biomedical application
No full textIn this project, the student was able to realize a low-power precision sample-and-hold (S/H) circuit for biomedical application based on switched-capacitor circuit. The performance of the circuit in this work is comparable with some previously published works on precision S/H circuits.
The S/H circuit was designed to work with a supply voltage of 1.8V and was realized in 0.18 μm CMOS technology. The S/H circuit was developed from a capacitive-reset gain switched-capacitor circuit that has benefits of insensitive to op-amp input offset, finite open-loop gain of op-amp, low power and rail-to-rail characteristic. Capacitor-mismatch compensation was then incorporated into it to make the circuit insensitive to capacitor mismatch. In response to intentionally introduced 2% of capacitor mismatch, output of the new circuit only changes by a few micro-percent with respect to that of circuit without any intentionally introduced capacitor mismatch. The parameters that were used to check the precision of the S/H circuit are hold pedestal and total harmonic distortion. In the end, the student managed to achieve hold-pedestal less than 0.081 mV and -76 dB of total harmonic distortion that corresponds to 12.62 bits of ENOB in response to 1-Vpp and 1-kHz sinusoidal input at 128 kHz of sampling frequency.
Operational amplifier (op-amp) used in the circuit plays a major part in contributing to the power consumption of the circuit. Thus, student has focused on reducing power consumption of the op-amp. With a target of achieving less than 13 μW of power consumption, some transistors in the op-amp may works in moderate or weak inversion. At last, the student managed to design an op-amp that consumes 12.04 μW that gives 0.395 μW/pF of power efficiency. The Figure of Merits achieved is 8.30×10-3 μA/MHz.Bachelor of Engineerin
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