6,346 research outputs found
Margaret Chan-Tan
No full textHead and shoulders portrait of Margaret Chan-Tan in academic regalia. [Verso caption] Graduated June 1955 M- C.M.E10 x 11 c
Differences in Radiative Forcing, Not Sensitivity, Explain Differences in Summertime Land Temperature Variance Change Between CMIP5 and CMIP6
No full text© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Chan, D., Rigden, A., Proctor, J., Chan, P. W., & Huybers, P. Differences in radiative forcing, not sensitivity, explain differences in summertime land temperature variance change between CMIP5 and CMIP6. Earth’s Future, 10(2), (2022): e2021EF002402, https://doi.org/10.1029/2021EF002402.How summertime temperature variability will change with warming has important implications for climate adaptation and mitigation. CMIP5 simulations indicate a compound risk of extreme hot temperatures in western Europe from both warming and increasing temperature variance. CMIP6 simulations, however, indicate only a moderate increase in temperature variance that does not covary with warming. To explore this intergenerational discrepancy in CMIP results, we decompose changes in monthly temperature variance into those arising from changes in sensitivity to forcing and changes in forcing variance. Across models, sensitivity increases with local warming in both CMIP5 and CMIP6 at an average rate of 5.7 ([3.7, 7.9]; 95% c.i.) × 10−3°C per W m−2 per °C warming. We use a simple model of moist surface energetics to explain increased sensitivity as a consequence of greater atmospheric demand (∼70%) and drier soil (∼40%) that is partially offset by the Planck feedback (∼−10%). Conversely, forcing variance is stable in CMIP5 but decreases with warming in CMIP6 at an average rate of −21 ([−28, −15]; 95% c.i.) W2 m−4 per °C warming. We examine scaling relationships with mean cloud fraction and find that mean forcing variance decreases with decreasing cloud fraction at twice the rate in CMIP6 than CMIP5. The stability of CMIP6 temperature variance is, thus, a consequence of offsetting changes in sensitivity and forcing variance. Further work to determine which models and generations of CMIP simulations better represent changes in cloud radiative forcing is important for assessing risks associated with increased temperature variance.This study was supported by the Harvard Global Institute and NSF (Award 1903657). D. Chan was also supported by the Woods Hole Oceanographic Institute Weston Howland Jr. Postdoctoral Fellowship
Data for: Conserving unprotected important coastal habitats in the Yellow Sea: shorebird occurrence, distribution and food resources at Lianyungang
No full textThis shapefile contains reclamation occurred along the Lianyungang Coast (34.5-35.2°N, 119.1-119.7°E) from January 2003 to June 2018, mapped from Landsat and Sentinel satellite images of 30 m resolution. Land use of the reclaimed areas (as of June 2018) were classified into aquaculture ponds, industrial land or undeveloped land
Cnemaspis selamatkanmerapoh Grismer, Wood, Mohamed, Chan, Heinz, Sumarli, Chan & Loredo 2013
No full textCnemaspis selamatkanmerapoh Grismer, Wood, Mohamed, Chan, Heinz, Sumarli, Chan & Loredo, 2013a Merapoh Rock Gecko Fig. 47 Holotype. Adult male (LSUHC 11016) “collected on 23 June 2013 by L. Lee Grismer at 2200 hrs at 23 m from Gua Gunting, Merapoh, Pahang, Peninsular Malaysia (4°42.069 N, 101°58.512 E)”. Diagnosis. Maximum SVL 43.4 mm SVL; 10 supralabials; nine or 10 infralabials; keeled ventrals; at least one, round precloacal pore in males; 30 paravertebral tubercles; dorsal body tubercles semi-randomly arranged; tuberculation weak on flanks; caudal tubercles not encircling tail; lateral caudal tubercles not within lateral caudal furrows; ventrolateral caudal tubercles absent; subcaudals keeled; no enlarged, median subcaudal scale row; three postcloacal tubercles; no enlarged femoral, subtibial, or submetatarsal scales; subtibials keeled; and 31–33 subdigital lamellae on fourth toe (Tables 6,7). Cnemaspis selamatkanmerapoh sp. nov. lack diagnostic color pattern characteristics. Color pattern in life (Fig. 47). Dorsal ground color grey; top of head bearing small dark spots; thin, dark postorbital stripes meeting medially on occiput and turning anteriorly; rostrum and supralabial region greenish; paired, light colored, paravertebral, blotches extend from nape to base of tail where they transform into light colored caudal bands, blotches united on nape and shoulder region into a single blotch; flanks bearing dark mottling and yellowish spots; limbs darkly mottled with a faint banding pattern; overall color of venter unicolor beige with all scales bearing black stippling. There is no sexual dimorphism in color pattern and coloration lightens considerably at night. Distribution. Cnemaspis selamatkanmerapoh is known only from the type locality of Gua Gunting, Merapoh, Pahang, Peninsular Malaysia (Fig. 2). Grismer et al. (2013a) reported finding eggs on the connected karst outcrop Gua Goyang. Natural History. Grismer et al. (2013a) noted that Cnemaspis selamatkanmerapoh is a lowland, diurnal species found only on karst substrate. Specimens were observed approximately 1 m above the ground along the perimeter of an extensive karst system surrounded by a limestone forest (Fig. 47) and lizards often position themselves adjacent to cracks into which they can escape if threatened. A gravid female carrying two eggs was collected during June. Relationships. Cnemaspis selamatkanmerapoh is the sister species of C. hangus sp. nov. (Fig. 2). Material examined. Malaysia: Pahang; Mearpoh, Gua Gunting LSUHC 11015–16 (type series).Published as part of Grismer, Lee, Wood, Perry L., Anuar, Shahrul, Riyanto, Awal, Ahmad, Norhayati, Muin, Mohd A., Sumontha, Montri, Grismer, Jesse L., Onn, Chan Kin, Quah, Evan S. H. & Pauwels, Olivier S. A., 2014, Systematics and natural history of Southeast Asian Rock Geckos (genus Cnemaspis Strauch, 1887) with descriptions of eight new species from Malaysia, Thailand, and Indonesia, pp. 1-147 in Zootaxa 3880 (1) on page 90, DOI: 10.11646/zootaxa.3880.1.1, http://zenodo.org/record/494956
Variable structure model for flow-induced tonal noise control with plasma actuators
No full textThe objective of this work was to study the effect of plasma actuators in attenuating low-speed flow-induced cavitytones from a control point of view by employing techniques from classical control. A modification of the existingphysics-based linear model produced a new variable structure model in which a plasma actuator was regarded as alinear gain. The parameters of the overall model working at two operating voltages were identified usingexperimental data. The effects of the plasma actuator control at other various operating voltages were thus able to bepredicted using linear interpolation. The good agreement between the predicted and the measured data supportedthe proposed variable structure model, inside of which plasma actuators affected the damping of cavity pressureoscillations proportionally to the applied voltage to reduce flow-induced tonal noise. With the proposed variablestructure model the system stability controlled by plasma actuators at various operating voltages was ensured, thus aclosed-loop control method could be applied without leading to instability. A simple proportional integral derivativecontroller was implemented. Results show the potential of a closed-loop method by increasing system powerefficiency
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
The experiences of black and minority ethnic academics: multiple identities and career progression
No full textSimultaneous Performance and Stability Enhancement in Intermediate Temperature Solid Oxide Fuel Cells by Powder-Atomic Layer Deposited LSCF@ZrO2 Cathodes
No full textEmploying porous structures is essential in high-performance electrochemical energy devices. However, obtaining uniform functional coatings on high-tortuosity structures can be challenging, even with specialized processes such as atomic layer deposition (ALD). Herein, a novel method for achieving a porous composite electrode for solid oxide fuel cells by coating La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) powders with ZrO2 using a powder ALD process is presented. Unlike conventional ALD, powder ALD can be used to fabricate extremely uniform coatings on porous electrodes with a thickness of tens of micrometers. The powder ALD ZrO2 coating is found to effectively suppress chemical degradation of the LSCF electrodes. The cell with the powder ALD coated cathode shows a 2.2 times higher maximum power density and 60% lower thermal degradation in activation resistance than the bare LSCF cathode cell at 700-750 degrees C. The result demonstrated in this study is expected to have significant implications for high-performance and durable electrodes in energy conversion/storage devices.
Fire and Glass by M. Chan
No full textChan, Marty. Fire and Glass. Richmond Hill, ON: Clockwise Press, 2016. Print.Kristina Mah finds herself in an unenviable situation at the start of grade nine: her father has abruptly abandoned Kristina and her mother, and they are forced to move from the familiarity of the suburbs to a small inner-city apartment. The transition to her new school takes some time - it’s old, rundown and all the students are addicted to their phones - but eventually she finds a new friend in Dylan, her grade’s resident iconoclast who cares little for social norms. Just when her life seems to be acquiring some semblance of normalcy, things take a turn at Mackenzie King School. After confirming with Dylan that the spooky interactive white board images are not merely a figment of her imagination, the pair further explore the school and accidentally free an evil Djinn into the halls. Kristina and Dylan’s ensuing adventures revolve around saving their families and school from this spirit.Fire and Glass is Marty Chan’s 15th book, and follows up his work on the Ehrich Weisz Chronicles series. As a radio presenter, playwright and self-anointed “professional liar”, Chan’s multiple talents have led to a distinguished profile in the Edmonton community. Fire and Glass kicks off a new series, Keepers of the Vault, which Chan is writing specifically with reluctant readers in mind. The action begins quickly, the plot is fast-paced, and the humour hits the mark; all in all, Fire and Glass is well positioned to re-engage junior high students with reading.Chan is adept at bridging the reality-fantasy gap by equipping his characters with modern technologies that help them to solve ancient, fantastical problems. While at times the suspense in Fire and Glass seems slightly contrived, later pages offer enough compelling spookiness and mystery to keep the reader intrigued. With a cliffhanger ending, fans will be eagerly anticipating the next entry in the series. Short paragraphs and chapters make this title an attractive choice for struggling readers, though its reach will extend to fantasy fans.Recommended: 3 Stars out of 3 Reviewer: Kyle MarshallReviewer biography: Kyle Marshall is the Assessment & Research Librarian for Edmonton Public Library. He graduated with his MLIS from the University of Alberta in June 2015, and is passionate about diversity in children\u27s and youth literature
Comparison between Occlusal Errors of Single Posterior Crowns Adjusted Using Patient Specific Motion or Conventional Methods
No full textRecently, digital technology has been used in dentistry to enhance accuracy and to reduce operative time. Due to advances in digital technology, the integration of individual mandibular motion into the mapping of the occlusal surface is being attempted. The Patient Specific Motion (PSM) is one such method. However, it is not clear whether the occlusal design that is adjusted using PSM could clinically show reduced occlusal error compared to conventional methods based on static occlusion. In this clinical comparative study including fifteen patients with a single posterior zirconia crown treatment, the occlusal surface after a clinical adjustment was compared to no adjustment (NA; design based on static occlusion), PSM (adjusted using PSM), and adjustment using a semi-adjustable articulator (SA) for the assessment of occlusal error. The root mean square (RMS; mu m), average deviation value (+/- AVG; mu m), and proportion inside the tolerance (in Tol; %) were calculated using the entire, subdivided occlusal surface and the out of tolerance area. Using a one-way ANOVA, the RMS and +AVG from the out of tolerance area showed a statistical difference between PSM (202.3 +/- 39.8 for RMS, 173.1 +/- 31.3 for +AVG) and NA (257.0 +/- 73.9 for RMS, 210.9 +/- 48.6 for +AVG). For the entire and subdivided occlusal surfaces, there were no significant differences. In the color-coded map analysis, PSM demonstrated a reduced occlusal error compared to NA. In conclusion, adjustment occlusal design using PSM is a simple and effective method for reducing occlusal errors that are difficult to identify in a current computer-aided design (CAD) workflow with static occlusion.11Nsciescopu
- …
