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Advances in Atmospheric Sciences 2022年第3期39卷 536-542页

作者： David H.BROMWICH Matthew A.LAZZARA Arthur M.CAYETTE jordan G.POWERS Kirstin WERNER john j.CASSANO steven R.COLWELL Scott CARPENTIER Xun ZOU Byrd Polar and Climate Research Center The Ohio State UniversityColumbusOhio 43210USA Antarctic Meteorological Research Center Space Science and Engineering CenterUniversity of Wisconsin-MadisonMadisonWisconsin 53704USA Department of Physical Sciences Madison Area Technical CollegeMadisonWisconsin 53706 USA Naval Information Warfare Center CharlestonSouth Carolina 29406USA National Center for Atmospheric Research BoulderColorado 53706USA Year of Polar Prediction(YOPP)International Coordination Office Alfred Wegener InstituteHelmholtz Centre for Polar and Marine ResearchBremerhaven 27570Germany National Snow and Ice Data Center Cooperative Institute for Research in Environmental Sciences and Department of Atmospheric and Oceanic SciencesUniversity of ColoradoBoulderColorado 80309USA British Antarctic Survey Cambridge CB30ETUnited Kingdom Bureau of Meteorology Hobart 7001Australia

1. Overview In june 2021, the 16th Workshop on Antarctic Meteorology and Climate (WAMC) and the 6th Year of Polar Prediction in the Southern Hemisphere (YOPP-SH) Meeting (http://***/WAMC;021/) were held online and hosted by the Polar Meteorology Group at Byrd Polar and Climate Research Center, The Ohio State University, Columbus,Ohio (Fig. 1).

关键词： Antarctic Hemisphere Climate

A refutation of reported Levallois technology from Guanyindong Cave in south China

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National Science Review 2019年第6期6卷 1094-1096页

作者： Feng Li Yinghua Li Xing Gao steven L.Kuhn Eric Boёda john W.Olsen Key Laboratory of Vertebrate Evolution and Human Origins of the Chinese Academy of Sciences Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences CAS Center for Excellence in Life and Paleoenvironment School of History Wuhan University University of Chinese Academy of Sciences School of Anthropology University of Arizona C.N.R.S.-UMR7041 Anthropologie des techniques des espaces et des territoires au Plio-Pléistocène Maison Archéologie et Ethnologie

As one of the most complex forms of lithic technology known for the Paleolithic, research on the Levallois stoneknapping method is critically relevant to our understanding of the cognitive abilities and depth of planning capabilities of archaic hominins, as well as the diffusion of knowledge and social learning in Pleistocene societies. For decades,

关键词： A refutation of reported Levallois technology from Guanyindong Cave in south China

Comparison of Hydrothermal and Sol-Gel Synthesis of Nano-Particulate Hydroxyapatite by Characterisation at the Bulk and Particle Level

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Open journal of Inorganic Non 2012年第1期2卷 1-10页

作者： Matthew Bilton steven j. Milne Andrew P. Brown 不详

Hydrothermal and sol-gel synthesis methods have been used to prepare nano-particulate hydroxyapatite (HA) powders for detailed characterisation. Bulk elemental analysis data are compared from X-ray diffraction, X-ray fluorescence and Fourier transform infrared spectroscopy. These show the presence of secondary phases in the sol-gel powders which can be attributed to evaporative loss of precursor phosphite phases during specimen preparation and breakdown of the primary HA phase during calcination. Only the primary HA phase is detected in the hydrothermally prepared powder. In addition, Ca/P ratios of each powder are determined at the particle level using transmission electron microscopy with energy dispersive X-ray spectroscopy (TEM-EDX), having first established a threshold electron fluence below which significant electron-beam-induced alteration of the composition of HA does not occur. The TEM-EDX results show a greater compositional variability of particles from the sol-gel preparation route compared to the hydrothermal route. Overall it is the combination of the analysis techniques that shows the hydrothermal synthesis route produces near- stoichiometric, single phase, hydroxyapatite.

关键词： Hydroxyapatite Hydrothermal Sol-Gel TEM-EDX XRD XRF FTIR

Financing Disaster Risk Reduction:Exploring the Opportunities,Challenges,and Threats Within the Southern African Development Community Region

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International journal of Disaster Risk Science 2023年第3期14卷 398-412页

作者： Christo Coetzee Sizwile Khoza Livhuwani D.Nemakonde Lesego B.Shoroma Gideon W.Wentink Maynard Nyirenda steven Chikuse Tchaka Kamanga Kgosietsile Maripe Morenaogaufi j.Rankopo Lengwe-Katembula Mwansa Dewald Van Niekerk African Centre for Disaster Studies Unit for Environmental Science and ManagementNorth-West UniversityPotchefstroom 2520North West ProvinceSouth Africa Sustainable Growth and Development Initiative Blantyre 312200Malawi Department of Social Work University of BotswanaGaboroneBotswana

The Southern African Development Community(SADC)region,a regional economic body comprised of 16 member states,is one of our planet's most vulnerable regions to natural hazards,and has a complex disaster risk *** region has sustained several disasters over the past *** events include annual floods in 2004-2019 and extreme droughts(1990-1993);other climate-induced disasters,such as cyclones,also have had devastating impacts,particularly on the Indian Ocean island states and east coast *** reduce the risk and impacts of dis asters,governments must invest in disaster risk reduction(DRR).However,interventions aimed at reducing social and economic vulnerability and investing in longterm mitigation activities are often few,poorly funded,and insignificant in comparison with money spent on humanitarian assistance,dis aster relief,and post-disaster *** study investigated whether DRR is adequately funded within SADC member states in light of the high stakes in human life,infrastructure,and economic losses and the potential savings *** study applied a qualitative research design with data collected through semistructured interviews and focus group *** were selected purposefully and through snowball sampling with a total of 67 respondents from Botswana,Eswatini,Namibia,South Africa,and Zimbabwe participating in the *** study findings reveal that DRR is inadequately funded in all the member states consulted in comparison to funding allocated to disaster *** light of the underfunding experienced by DRR activities,this study provides a platform for lobbying and advocacy for adequate funding for DRR.

关键词： Budget allocations Disaster impacts Disaster risk reduction Southern African Development Community

One hundred and seventy-eight consecutive pancreatoduodenectomies without mortality:role of the multidisciplinary approach

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Hepatobiliary & Pancreatic Diseases International 2011年第4期10卷 415-421页

作者： jaswinder S Samra Raul Alvarado Bachmann julian Choi Anthony Gill Michael Neale Vikram Puttaswamy Cameron Bell Ian Norton Sarah Cho steven Blome Ritchie Maher Sivakumar Gananadha Thomas j Hugh Upper Gastrointestinal Surgical Unit University of SydneyRoyal North Shore HospitalSt LeonardsNSW2065SydneyAustralia Department ofAnatomical Pathology University of SydneyRoyal North Shore HospitalSt LeonardsNSW2065SydneyAustralia Department of Vascular Surgery University of SydneyRoyal North Shore HospitalSt LeonardsNSW2065SydneyAustralia Department of Gastroenterology University of SydneyRoyal North Shore HospitalSt LeonardsNSW2065SydneyAustralia Department of Radiology University of SydneyRoyal North Shore HospitalSt LeonardsNSW2065SydneyAustralia

BACKGROUND:Pancreatoduodenectomy offers the only chance of cure for patients with periampullary ***,however,is a major undertaking in most patients and is associated with a significant morbidity and mortality.A multidisciplinary approach to the workup and follow-up of patients undergoing pancreatoduodenectomy was initiated at our institution to improve the diagnosis,resection rate,mortality and *** undertook the study to assess the effect of this approach on diagnosis,resection rates and short-term outcomes such as morbidity and ***:A prospective database of patients presenting with periampullary cancers to a single surgeon between April 2004 and April 2010 was *** cases were discussed at a multidisciplinary meeting comprising surgeons,gastroenterologists,radiologists,oncologists,radiation oncologists,pathologists and nursing staff.A standardized investigation and management algorithm was *** were graded according to the Clavien-Dindo ***:A total of 295 patients with a periampullary lesion were discussed and 178 underwent pancreatoduodenectomy (resection rate 60%).Sixty-one patients (34%) required either a vascular or an additional organ ***-nine patients experienced complications,of which the commonest was blood transfusion (12%).Thirty-four patients (19%) had major complications,*** 3 or *** was no in-hospital,30-day or 60-day ***:Pancreatoduodenectomy can safely be performed in high-volume centers with very low *** surgeon’s role should be careful patient selection,intensive preoperative investigations,use of a team approach,and an unbiased discussion at a multidisciplinary meeting to optimize the outcome in these patients.

关键词： pancreatoduodenectomy multidisciplinary vascular resection

The 13th and 14th Workshops on Antarctic Meteorology and Climate

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Advances in Atmospheric Sciences 2020年第5期37卷 423-430页

作者： Matthew A.LAZZARA Sophie A.ORENDORF Taylor P.NORTON jordan G.POWERS David H.BROMWICH Scott CARPENTIER john j.CASSANO steven R.COLWELL Arthur M.CAYETTE Kirstin WERNER Antarctic Meteorological Research Center Space Science and Engineering CenterUniversity of Wisconsin-MadisonMadisonWI 53706USA Department of Physical Sciences School of Arts and SciencesMadison Area Technical CollegeMadison WI 53704USA Department of Atmospheric Sciences University of Wisconsin-MadisonMadisonWI 53706USA National Center for Atmospheric Research Boulder CO 53706USA Polar Meteorology Group Byrd Polar&Climate Research CenterThe Ohio State UniversityColumbus OH 43210USA Bureau of Meteorology HobartTasmania 7001Australia Cooperative Institute for Research in Environmental Sciences and Department of Atmospheric and Oceanic Sciences University of ColoradoBoulderCO 80309USA British Antarctic Survey Cambridge CB30ETUnited Kingdom Naval Information Warfare Center CharlestonSC 29406USA Year of Polar Prediction(YOPP)International Coordination Office Alfred Wegener InstituteHelmholtz Centre for Polar and Marine ResearchBremerhaven 27570Germany

*** In july 2018,the Antarctic community came together to meet at the 13th Workshop on Antarctic Meteorology and Climate(WAMC)in Madison,Wisconsin,USA(Fig.1);and in the following year in june 2019,the 14th WAMC was held in Charleston,South Carolina,USA(Fig.2).With a growing history,the WAMC addresses the topics of Antarctic meteorology and climate(Kameda et al.,2008;Colwell et al.,2016;Lazzara et al.,2018)as well as weather-related issues of scientific and operational *** workshops bring together researchers,operational forecasters,numerical modelers,observational specialists,and *** themes of both workshops included Antarctic meteorological observations,Antarctic atmospheric numerical modeling,Antarctic meteorological and climate research,and Antarctic weather forecasting and operational *** 2018 and 2019 WAMC were both followed by a one-day focus on the Year of Polar Prediction-Southern Hemisphere(YOPP-SH),when preparations and follow-up discussions were made with regard to the YOPP Special Observing Period from 16 November 2018 to 15 February 2019.

关键词： Antarctic weather meteorological

Vortex Shedding Lock-in on Tapered Poles with Polygonal Cross-Section

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Open journal of Fluid Dynamics 2022年第2期12卷 127-153页

作者： jaime A. Ocampo steven H. Collicott Robert j. Connor School of Aeronautics and Astronautics Purdue University West Lafayette USA Lyles School of Civil Engineering Purdue University West Lafayette USA

A study to investigate the effects of taper on vortex shedding coherence on High Mast Lighting Towers (HMLT) with models of eight-, twelve-, and sixteen-sided polygonal cross-section was performed in Purdue’s Boeing Low-Speed Wind Tunnel. Partial tower models were mounted on springs to recreate a flutter phenomenon seen on high mast lighting towers and data was taken using a stationary configuration within the wind tunnel. The model was later oscillated at specified frequencies and amplitudes and the resulting wake and surface pressures were recorded and compared to the stationary cases. The researchers aim to study the characteristics of a “lock-in” phenomenon, that is, a region of pole height where there is a vortex cell with a single shedding frequency, instead of different shedding frequencies for different diameters as Strouhal theory dictates. Results show the existence of vortex cell shedding for clamped models. Using a motor and a forcing cam to recreate the elastic movement of the HMLT in ambient conditions has yielded a specific range of diameters to determine the size of the locked in vortex cells. According to standard Department of Transportation manufacturing standards for tapered HMLT, the lock in distance for small excitations (0.254 cm) would be approximately 305 cm in tower height.

关键词： Vortex Shedding Lock-In Tower Aerodynamics

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朗文国际英语教程视听教程

Male Music Frogs Compete Vocally on the Basis of Temporal Sequence Rather Than Spatial Cues of Rival Calls

2012年

作者： Bill Bliss[编] steven j. Molinsky

本书真实场景，真人拍摄，为学生提供最贴近生活的视频内容，让学生进入视听读结合的全方位英语学习氛围。单元后提供视频脚本，方便学生检查自己的理解情况。

ISBN: (数字)9787544623612

ISBN: (纸本)9787544623612

关键词：英语课听力中小学教学参考资料

来源：畅想之星图书光盘版（南... 评论

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Asian Herpetological Research 2015年第4期6卷 305-316页

作者： Fan jIANG Guangzhan FANG Fei XUE jianguo CUI steven E.BRAUTH Yezhong TANG Chengdu Institute of Biology Chinese Academy of Sciences Department of Psychology University of Maryland

Male-male vocal competition in anuran species may be influenced by cues related to the temporal sequence of male calls as well by internal temporal, spectral and spatial ones. Nevertheless, the conditions under which each type of cue is important remain unclear. Since the salience of different cues could be reflected by dynamic properties of male-male competition under certain experimental manipulation, we investigated the effects of repeating playbacks of conspecific calls on male call production in the Emei music frog（Babina daunchina）. In Babina, most males produce calls from nest burrows which modify the spectral features of the cues. Females prefer calls produced from inside burrows which are defined as highly sexually attractive（HSA） while those produced outside burrows as low sexual attractiveness（LSA）. In this study HSA and LSA calls were broadcasted either antiphonally or stereophonically through spatially separated speakers in which the temporal sequence and/or spatial position of the playbacks was either predictable or random. Results showed that most males consistently avoided producing advertisement calls overlapping the playback stimuli and generally produced calls competitively in advance of the playbacks. Furthermore males preferentially competed with the HSA calls when the sequence was predictable but competed equally with HSA and LSA calls if the sequence was random regardless of the availability of spatial cues, implying that males relied more on available sequence cues than spatial ones to remain competitive.

关键词： male-male competition advertisement call sequence cue spatial cue call timing.

Circadian Rhythm of Calling Behavior in the Emei Music Frog(Babina daunchina) is Associated with Habitat Temperature and Relative Humidity

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Asian Herpetological Research 2011年第3期2卷 149-154页

作者： jianguo CUI Xiaoyan SONG Guangzhan FANG Fei XU steven E. BRAUTH Yezhong TANG Chengdu Institute of Biology Chinese Academy of Sciences Sichuan Institute of Animal Sciences Department of Psychology University of MarylandCollege Park

Generally, the function of vocalizations made by male anurans are to attract females or defend resources. Typically, males vocalize in choruses during one or more periods in a twenty-four-hour cycle, which varies, however, among species. Nevertheless, the causal factors influencing circadian variations of calling patterns in anuran species are not clear. In this study, male chorus vocalizations were monitored in the Emei music frog(Babina daunchina) for 17 consecutive days during the breeding season, while its habitat air temperature and relative humidity in the course of experiments were measured as well. The results revealed that the circadian calling patterns were characterized by two periods of peak vocalization, which were observed from 0500 h to 0700 h and from 1300 h to 2000 h, while the lowest activity period was found from 2100 h to 2200 h. Both calls/h and notes/h were positively correlated with air temperature and negatively with relative humidity. Overall, our data indicate that the Emei music frogs(B. daunchina) could regulate their vocal activities based on the changes of physical micro-environment(e. g., temperature or humidity) to maximize reproductive success.

关键词： rest-activity cycle advertisement call temperature humidity Emei music frog(Babina daunchina