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Phase field modeling with large driving forces

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npj Computational Materials 2023年第1期9卷 623-631页

作者： Jin Zhang Alexander F.Chadwick David l.Chopp Peter W.Voorhees Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Engineering Sciences and Applied Mathematics Northwestern UniversityEvanstonIL 60208USA

There is growing interest in applying phase field methods as quantitative tools in materials discovery and ***,large driving forces,common in many materials systems,lead to unstable phase field profiles,thus requiring fine spatial and temporal *** demands more computational resources,limits the ability to simulate systems with a suitable size,and deteriorates the capability of quantitative ***,we develop a strategy to map the driving force to a constant perpendicular to the *** with the third-order interpolation function,we find a stable phase field profile that is independent of the magnitude of the driving *** power of this approach is illustrated using three *** demonstrate that by using the driving force extension method,it is possible to employ a grid size orders of magnitude larger than traditional *** approach is general and should apply to many other phase field models.

关键词： forces interpolation apply

Investigation of natural VOC emitted from tropical vegetations in China

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Journal of Environmental Sciences 2005年第1期17卷 8-13页

作者： WANGZhi-hui BAIYu-hua lIUZhao-rong WANGXue-song lIQing-junt l.F.Klinger CollegeofEnvironmentalSciences PekingUniversityBeijing100871China XishuangbannaTropicalBotanicalGarden ChineseAcademyofSciencesKunming650223China InstituteofNoeticSciences 101SanAntonioRoadPetalumaCA94952USA

Twenty three kinds of typical plants in Xishuangbanna, the tropical area of southwestern China, were screened to estimate the emission rates of isoprene and monoterpenes by adopting bag enclosure and curette sampling methods followed by a GC FID analysis. It was found that the Ficus species were mainly emitting isoprene and most tropical vegetations were mainly releasing monoterpenes. The results also showed that the emissions of isoprene were affected by both temperature and PAR(Photosynthetic Active Radiation), while monoterpene emissions were mainly temperature dependent.

关键词： VOC isoprene monoterpenes emission factor Xishuangbanna

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Migration of a Progestin Implant into a Pulmonary Artery: Observation of a Case at the Reference Health Center of Commune III of the District of Bamako in Mali

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Open Journal of Obstetrics and Gynecology 2024年第9期14卷 1431-1436页

作者： Hamady Sissoko Souma Kodio Hamidou Albachar Cheickna Sylla Salif Diarra Sidy Moctar Diakité Mohamed Traoré Souleymane Traoré Ibrahim Fomba Ouncoumba Diarra Nana Bah Drissa Diarra Mahamoudou Coulibaly Bocary Sidi Koné Hawa Samaké Ahmadou Coulibaly Mamadou Traoré Seydou Z. Dao Sitapha Dembélé Samou Diarra Konimba Koné Alou Samaké Sanogo Siaka Amara Reference Health Centre of Commune III of the District of Bamako Bamako Mali Department of Gynecology and Obstetrics Gabriel Toure University Hospital Center in Bamako Bamako Mali Department of Gynecology and Obstetrics Kalaban Coro Reference Health Centre Bamako Mali Mohamed VI Perinatal Clinic Bamako Mali Reference Health Centre of Commune V of the District of Bamako Bamako Mali Point-G Obstetrics and Gynecology Department of University Hospital Center Bamako Mali Reference Health Centre of Commune II of the District of Bamako Bamako Mali H Department of Gynecology and Obstetrics of the Fousseyni Daou Hospital in Kayes Kayes Mali Reference Health Centre of Commune VI of the District of Bamako Bamako Mali

It was a 36-year-old patient, 5th Pregnancy, 5th Delivery, 4 live children, and I deceased, had a consultation in the department for the removal of implants. Questioning revealed that she had had the implant three years ago without medical follow-up. It was in view of the difficulties in extracting the capsule that the chest X-ray and CT scan carried out concluded that the implant had migrated into a branch of the left pulmonary artery. Therapeutic abstention has been the attitude of cardiovascular surgeons.

关键词： Migration Implant Pulmonary Artery Bamako

An Elementary Study of the Unearthed Mathematics Book, Suanshu Shu

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Chinese Annals of History of Science and Technology 2017年第1期1卷 24-58页

作者： Zou Dahai lüXin Institute for the History of Natural Sciences CASBeijing 100190China 不详

The transcription of the Suanshu Shu算數書(a bamboo book of mathematics)in simplified Chinese characters offers a new opportunity to explore the history of Chinese mathematics in ancient *** paper analyzes the style and structure of the Suanshu Shu and makes comparisons with the Nine Chapters on Mathematical Procedures and a number of other texts in various social *** will be shown that the Suanshu Shu was compiled from at least two sources,and that no direct textual interplay exists between the Suanshu Shu and the Nine Chapters,although both share the same origins in the Pre-Qin period when the major mathematical methods in the Nine Chapters came into *** will also be shown that the Suanshu Shu was accomplished with the methods used in certain mathematical books in the Pre-Qin period or their results,which later led to the Nine Chapters,and by accommodating the actual conditions of the lower government *** Suanshu Shu is significant for establishing the evolution of algorithmic mathematics from the Warring States period to the Han dynasty.

关键词： Suanshu Shu Nine Chapters on Mathematical Procedures mathematics from the Pre-Qin period to the Han dynasty

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Scientific Communication in the Developing World in an Open Access Mode: The SciElO Model

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图书情报工作 2006年第1期50卷 38-40页

作者： Rogerio Meneghini Abel l.Packer latin American and Caribbean Center of Information in Health Sciences BIREME/ PAHS/WHOSao Paulo Brazil

This paper introduces the Scientific Electronic library Online (SciElO) program and its three main objectives. Then the paper presents the methodology of open access to scientific information by the SciElO. At last, i... 详细信息

关键词： open access SciElO BIREME PAHO FAPESP Brazil scientific information

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Professionalization and the Training of University Administrators in China:A Comparative Perspective

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Frontiers of Education in China 2013年第2期8卷 303-320页

作者： GENG Yiqun John l.YEAGER Institute of Communication Studies Communication University of ChinaBeijing 100024China School of Education University of PittsburghPittsburghPA 15260USA

Compared to the training of higher education management professionals in the US,the training of their counterparts in China is relatively modest,with few programs offered at the graduate ***,few concrete solutions have been proposed for tackling the challenge of preparing managerial professionals for the sound development of higher educational institutions in *** on existing theories and practices associated with professionalization and findings from the literature and data collected from universities both in China and the US,this paper examines the training of higher education professionals from a comparative perspective in the two *** the intention of identifying the characteristics of“best practices”for the training and education of institutional executives,in an effort to provide possible suggestions for the future development of higher management training in China,the paper will discuss the topic from two perspectives:short-term in-service training programs and formal PhD and EdD programs.

关键词： professionalization higher education management training administrators

Studies on Ways to Define Public Goods Attributes——Reflections on and Extension to the Classical Defining Way

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学术界 2011年第5期 267-268页

作者： lü Pusheng School of Government,Peking University

In public economics,classical public goods theory usually defines the goods attribute by distinguishing the consumptive characteristics of *** believe that the(pure) public goods are the goods or services which are non—competitive and non-exclusive in *** defining way is to summarize the common characteristics of some certain goods from the consumptive angle

关键词： Reflections on and Extension to the Classical Defining Way Studies on Ways to Define Public Goods Attributes

Successful elimination of extended-spectrum beta-lactamase (ESBl)-producing nosocomial bacteria at a neonatal intensive care unit

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World Journal of Pediatrics 2017年第3期13卷 210-216页

作者： Borbála Szél Zsolt Reiger Edit Urbán Andrea lázár Krisztina Mader Ivelina Damjanova Kamilla Nagy Gyula Tálosi Infection Control Unit University of SzegedHungary Department of Pediatrics University of SzegedHungary Institute of Clinical Microbiology University of SzegedHungary Department of Bacteriology National Center for EpidemiologyHungary

Background:Extended-spectrum beta-lactamase (ESBl)-producing Gram-negative bacteria are highly dangerous to *** our Neonatal Intensive Care Unit (NICU),the presence of these bacteria became so threatening in 2011 that immediate intervention was ***:This study was conducted during a nearly two-year period consisting of three phases:retrospective (9 months),educational (3 months) and prospective (9 months).Based on retrospective data analysis,a complex management plan was devised involving the introduction of the INSURE protocol,changes to the antibiotic regimen,microbiological screening at short intervals,progressive feeding,a safer bathing protocol,staff hand hygiene training and continuous monitoring of the number of newly infected and newly colonized *** these intervals,a total of 355 patients were ***:Both ESBl-producing Enterobacter cloaceae and Klebsiella pneumoniae were found (in both patients and environmental samples).In the prospective period a significant reduction could be seen in the average number of both colonized (26/167 patients;P=0.029) and infected (3/167 patients;P=0.033) patients compared to data from the retrospective period regarding colonized (72/188 patients) and infected (9/188 patients) *** was a decrease in the average number of patientdays (from 343.72 to 292.44 days per months),though this difference is not significant (P=0.058).During the prospective period,indirect hand hygiene compliance showed a significant increase (from the previous 26.02 to 33.6 hand hygiene procedures per patient per hospital day,Plusion:Colonizations and infections were rolled back successfully in a multi-step effort that required an interdisciplinary approach.

关键词： hand hygiene INSURE protocol interdisciplinary approach neonates polyresistance

Unexpected ecotone dynamics of a sand dune vegetation complex following water table decline

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Journal of Plant Ecology 2016年第1期9卷 40-50页

作者： Csaba Tölgyesi Márta Zalatnai lászlóErdős Zoltán Bátori Nicole Rosemary Hupp lászlóKörmöczi Department of Ecology University of SzegedSzeged H-6726Hungary Wildlife Biology Program College of Forestry and ConservationUniversity of Montana32 Campus DriveMissoulaMontanaMT 59812USA

Aims Central Hungarian inland dune ranges harbor heterogeneous grassland vegetation with an extensive network of ecotones,arranged perpendicular to topography-driven hydrologic *** area suffers from severe aridification due to climate change and local anthropogenic factors,which have led to a dramatic decline of the water *** a result,groundwater is no longer reachable for lowlying plant communities;thus,we expect they are bound to undergo profound *** study investigates how the plant communities respond to this changing environment over time by monitoring ecotones,since they are frequently the hotspots of ecosystem *** monitored five ecotones along permanent belt transects for 15 years to characterize their dynamic response,and to identify the internal structural changes of the plant communities the ecotones *** Ecotones were delineated with the split moving window *** dynamics of two ecotone parameters,location and contrast,were analyzed with linear regression models incorporating two independent variables:study year as a measure of time since the loss of groundwater,and precipitation as a possible driver of interannual *** internal changes of the patches separated by the ecotones were analyzed using plant functional *** Findings Precipitation had no detectable effect on the ecotone descriptors,but study year influenced ecotones in an unusual *** position of the ecotones appeared to be very stable in time;their dynamics are stationary,not directional as we *** contrasts had clear tendencies;two ecotones disappeared,one new one was formed and two ecotones showed no *** internal changes of the patches over time were dramatic,showing a shift toward more xeric and more open plant assemblages in most stretches of the ***,the dynamic response of the vegetation was not patch expansion ***,but fusion ***,which profoundly restructured the vegetati

关键词： groundwater decline plant functional group sand dune vegetation split moving window stationary ecotone