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On a conjecture by Blocki and Zwonek

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Science China Mathematics 2017年第6期60卷 963-966页

作者： FORNAESS John erik Department of Mathematics Norwegian University of Science and Technology Trondheim 7049 Norway

This paper gives a counterexample to a conjecture by Blocki and Zwonek on the area of sublevel sets of the Green's function.

关键词： pluricomplex Green function convexity Suita conjecture

Three Lemmas on Dynamic Cavity Method

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Communications in Theoretical Physics 2011年第7期56卷 157-162页

作者： erik Aurell Hamed Mahmoudi Department of Computational Biology AlbaNova University Centre Department of Information and Computer Science Aalto UniversityFinland

We study the dynamic cavity method for dilute kinetic Ising models with synchronous update rules. For the parallel update rule we find for fully asymmetric models that the dynamic cavity equations reduce to a Markovian dynamics of the (time-dependent) marginal probabilities. For the random sequential update rule, also an instantiation of a synchronous update rule, we find on the other hand that the dynamic cavity equations do not reduce to a Markovian dynamics, unless an additional assumption of time factorization is introduced. For symmetric models we show that a fixed point of ordinary Belief propagation is also a fixed point of the dynamic cavity equations in the time factorized approximation. For clarity, the conclusions of the paper are formulated as three lemmas.

关键词： kinetic Ising model cavity method disordered systems

Targeting and Regulation of Cell Wall Synthesis During Tip Growth in Plants

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Journal of Integrative Plant Biology 2013年第9期55卷 835-846页

作者： Fangwei Gu erik Nielsen Department of Molecular Cellular and Developmental Biology University of MichiganAnn Arbor Michigan 48109 USA

Root hairs and pollen tubes are formed through tip growth, a process requiring synthesis of new cell wall material and the precise targeting and integration of these components to a selected apical plasma membrane domain in the growing tips of these cells. Presence of a tip-focused calcium gradient, control of actin cytoskeleton dynamics, and formation and targeting of secretory vesicles are essential to tip growth. Similar to cells undergoing diffuse growth, cellulose, hemi-celluloses, and pectins are also deposited in the growing apices of tip-growing cells. However, differences in the manner in which these cell wall components are targeted and inserted in the expanding portion of tip-growing cells is reflected by the identification of elements of the plant cell wall synthesis machinery which have been shown to play unique roles in tip-growing cells. In this review, we summarize our current understanding of the tip growth process, with a particular focus on the subcellular targeting of newly synthesized cell wall components, and their roles in this form of plant cell expansion.

关键词： Cellulose membrane trafficking plant cell wall pollen tube root hair tip growth.

The role of ions in plasma catalytic carbon nanotube growth： A review

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Frontiers of Chemical Science and Engineering 2015年第2期9卷 154-162页

作者： erik C. Neyts Research Group PLASMANT Department of Chemistry University of Antwerp Universiteitsplein 1 2610 Wilrijk-Antwerp Belgium

While it is well-known that the plasma- enhanced catalytic chemical vapor deposition （PECVD） of carbon nanotubes （CNTs） offers a number of advantages over thermal CVD, the influence of the various individual contributing factors is not well understood. Especially the role of ions is unclear, since ions in plasmas are generally associated with sputtering rather than with growing a material. Even so, various studies have demonstrated the beneficial effects of ion bombardment during the growth of CNTs. This review looks at the role of the ions in plasma- enhanced CNT growth as deduced from both experimental and simulation studies. Specific attention is paid to the beneficial effects of ion bombardment. Based on the available literature, it can be concluded that ions can be either beneficial or detrimental for carbon nanotube growth, depending on the exact conditions and the control over the growth process.

关键词： plasma-enhanced chemical vapor deposition(PECVD) carbon nanotube (CNT) ion bombardment,defect healing

West Nile virus:North American experience

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Integrative Zoology 2011年第3期6卷 279-289页

作者： erik K.HOFMEISTER USGS National Wildlife Health Center MadisonWisconsinUSA

West Nile virus,a mosquito-vectored flavivirus of the Japanese encephalitis serogroup,was first detected in North America following an epizootic in the New York City area in *** the intervening 11 years since the arrival of the virus in North America,it has crossed the contiguous USA,entered the Canadian provinces bordering the USA,and has been reported in the Caribbean islands,Mexico,Central America and,more recently,South *** Nile virus has been reported in over 300 species of birds in the USA and has caused the deaths of thousands of birds,local population declines of some avian species,the clinical illness and deaths of thousands of domestic horses,and the clinical disease in over 30000 Americans and the deaths of over *** to the emergence of West Nile virus in North America,*** encephalitis virus and Dengue virus were the only other known mosquito-transmitted flaviviruses in North America capable of causing human *** review will discuss the North American experience with mosquito-borne flavivirus prior to the arrival of West Nile virus,the entry and spread of West Nile virus in North America,effects on wild bird populations,genetic changes in the virus,and the current state of West Nile virus transmission.

关键词： arbovirus emerging infectious disease North America West Nile virus zoonotic disease

Impact of ethnicity on the outcomes of acute pancreatitis:insights from US National Inpatient Sample

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Journal of Pancreatology 2024年第1期7卷 86-89页

作者： Ali Jaan Sheza Malik Joel E.McFarland erik T.Olson Byron Cryer Department of Internal Medicine Rochester General HospitalRochesterNY Department of Gastroenterology Rochester General HospitalRochesterNY Department of Gastroenterology Baylor University Medical CenterDallasTX

Introduction Acute pancreatitis(AP),characterized by inflammation of the pancreas,is a critical medical condition with potentially life-threatening consequences.[1]Despite significant advancements in medical science,the prognosis of AP remains challenging and is influenced by a multitude of *** these factors,ethnicity has emerged as a compelling variable that may play a pivotal role in determining the outcomes and severity of AP.[2]Understanding the influence of ethnicity on AP outcomes has immense significance for several ***,it provides a unique opportunity to gain critical insights into the pathophysiology of the disease.

关键词： pancreatitis insight consequences

Use of petrological and organic geochemical data in determining hydrocarbon generation potential of coals:miocene coals of Malatya Basin(Eastern Anatolia-Turkey)

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International Journal of Coal Science & Technology 2021年第4期8卷 510-533页

作者： Nazan Yalcin erik Faruk Ay Department of Geological Engineering Cumhuriyet University58140 SivasTurkey Department of Anthropology Cumhuriyet University58140 SivasTurkey

With this study,the hydrocarbon generation potential of Miocene aged coals around Arguvan-Parçikan in the northern district of Malatya province was evaluated with the aid of petrological and organic geochemical *** to organic petrography,coal quality data,and low thermal maturity,the Arguvan-Parçikan coals are of high-ash,high-sulfur subbituminous B/C *** organic fraction of the coals is mostly comprised of humic group macerals,with small percentages derived from the inertinite and liptinite *** mineral matter of the coals is comprised mainly of calcite and clay *** total organic carbon(TOC,wt%)values of the shale and coal samples are between 2.61 wt%and 43.02 wt%,and the hydrogen index values are between 73 and 229 mg HC/g ***(T_(max),PI),huminite/vitrinite reflectance(R_(o),%),and biomarker ratios CPI,Pr/Ph ratio,Ts/(Ts+Tm)ratio,C_(32) homohopane ratio(22S/22S+22R)and C_(29)ββ/(ββ+ααsterane ratio)indicate that the organic matter of the studied coals is thermally *** all these data are taken together,Miocene aged coals around Arguvan are suitable for hydrocarbon generation,especially gas,in terms of organic matter type(Type III and Type II/III mixed),organic matter amount(>10 wt%TOC),however,low liptinitic macerals(<15%–20%),low hydrogen index(<200 mg HC/g TOC)and low thermal maturity values inhibit the hyrocarbon generation.

关键词： Arguvan Malatya basin Eastern Anatolia Organic geochemistry Organic petrography Miocene coal

Topology optimization of 3D shell structures with porous infill

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Acta Mechanica Sinica 2017年第4期33卷 778-791页

作者： Anders Clausen erik Andreassen Ole Sigmund Department of Mechanical Engineering Solid MechanicsTechnical University of Denmark 2800 Lyngby Denmark

This paper presents a 3D topology optimization approach for designing shell structures with a porous or void interior. It is shown that the resulting structures are significantly more robust towards load perturbations than completely solid structures optimized under the same conditions. The study indicates that the potential benefit of using porous structures is higher for lower total volume *** to earlier work dealing with 2D topology optimization, we found several new effects in 3D problems. Most notably, the opportunity for designing closed shells significantly improves the performance of porous structures due to the sandwich effect. Furthermore, the paper introduces improved filter boundary conditions to ensure a completely uniform coating thickness at the design domain boundary.

关键词： porous shells topology interior perturbations opportunity dealing earlier stiffness struc

The Younger Dryas Event and Holocene Climate Fluctuations Recorded in a Stalagmite from the Panlong Cave of Guilin

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Acta Geologica Sinica(English Edition) 1998年第4期72卷 455-465页

作者： Stein-erik LAURITZEN Dapartment of Geology Bergen UniversigyNorway

: Comprehensive studies on a stalagmite from the Panlong cave, Guilin, have shown that the isotopic records and sedimentary characteristics can reflect the changes of both palaeotemperatures and palaeorainfall, that is to say, it is possible to get some information about the changes in climate of the area from the speleothem. The results suggest that: (1) the Younger Dryas event might have persisted in the area from 11 300 to 10 800 a B.P.; (2) from 9000 to 7000 a B.P., the climate got warmer and wetter, and the summer monsoon was gradually enhanced; (3) from 7000 to 4500 a B.P., the climate was warm and wet, and the summer monsoon prevailed; and (4) from 4500 a B.P. on, the summer monsoon was weakened and the modern climate pattern appeared, but there were several cold and dry periods, namely, from 4000 to 2500 a B.P., ca. 2400 a B.P. and < 1000 a B.P.

关键词： Younger Dryas Holocene climate stalagmite Guilin