检索结果-南通市图书馆

Time-and Channel-Efficient Link Scheduling for Convergecast in WirelessHART Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Time-and Channel-Efficient Link Scheduling for Convergecast ...

The search for roAp stars: null results and new candidates from Strmgren-Crawford photometry

2011 IEEE 13th International Conference on Communication Technology(ICCT 2011)

作者： Pablo Soldati Mikael johansson School of Electrical Engineering KTHSE-10044 StockholmSweden

Fast convergecast is a critical functionality for wireless networks deployed for industrial monitoring and *** address the time-and channel-optimal link scheduling problem for convergecast in multi-line networks,operating according to the recent WirelessHART *** first establish the lower bound on convergecast time and the lower bound on the number of channels for time-optimal *** we present optimal scheduling policy for time-optimal convergecast and near-optimal policy for jointly time-and channel-optimal *** and simulation results show that our scheme can provide fast convergecast in WirelessHART networks.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第11期18卷 43-54页

作者： Ernst Paunzen Gerald Handler Katerina Honkova Jakub Jurysek Martin Masek Marek Drozdz Jan Janik Waldemar Ogtoza Lars Hermansson Mats johansson Martin Jelinek Marek Skarka Miloslav Zejda Department of Theoretical Physics and Astrophysics Masaryk UniversityKotlarska 2CZ-61137Czech Republic Nicolaus Copernicus Astronomical Center Bartycka 1800-716WarsawPoland Variable Star and Exoplanet Section of Czech Astronomical Society Vsetinska 941/78CZ-75701Valasske MeziriciCzech Republic Institute of Physics The Czech Academy of SciencesNa Slovance 1999/2CZ-18221PrahaCzech Republic Mt.Suhora Observatory Pedagogical UniversityPodchorazych 230-084KrakowPoland Sandvretens Observatory Linnegatan 5A75332UppsalaSweden Astronomical Institute Czech Academy of Sciences(ASU CAS)OndrejovCzech Republic

The rapidly oscillating Ap(roAp) stars exhibit pulsational photometric and/or radial velocity variations on time scales of several minutes, which are essential to test current pulsation models as well as our assumptions of atmospheric structure characteristics. In addition, their chemical peculiarity makes them very interesting for probing stellar formation and evolution in the presence of a global magnetic field. To date, a limited number of only 61 roAp stars is known to show photometric variability. On the other hand, a literature survey yields 619 unique stars that have unsuccessfully been searched for variability of this kind. Str o¨mgren-Crawford uvbyβ photometry of stars from both subgroups was used to investigate whether there is a selection bias for the investigated stars. We also present new photometric measurements(202 hours on 59 different nights) of 55 roAp candidates. We did not detect any new roAp star. Although our detection limits are comparable to other surveys, we also did not find pulsations in the known roAp star HD 12098, which may be a consequence of temporal amplitude changes. On the other hand, we do find some evidence for photometric variability of beta CrB at its spectroscopically derived pulsation period. From the uvbyβ photometry we conclude that the blue border of the roAp instability strip appears observationally well defined, whereas the red border is rather poorly known and *** these boundaries, a total of 4646 candidates were identified which appear worth investigating for short-term pulsational variability.

关键词： stars: chemically peculiar stars: early-type stars: variables: general techniques: photometric

Phylogenetic relationships within the “Coraciiformes” and “Piciformes”

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phylogenetic relationships within the “Coraciiformes” and ...

Outcomes of Medicare beneficiaries hospitalised with transient ischaemic attack and stratification using the ABCD^(2) score

23rd International Ornithological Congress

作者： Ulf S.johansson Swedish Museum of Natural History. Dept. of Vertebrate Zoology. Box 50007 SE-104 05 Stockholm Sweden

＜正＞ A phylogenetic hypothesis of the relationships within the "higher land bird" assemblage is presented. Special emphasis is placed on the systematic position of component families in the possibly non-monophyletic orders Coraciiformes and Piciformes. The supporting data set comprises nucleotide sequences obtained from both nuclear and mitochondrial genomes.

关键词： phylogeny DNA sequences Coraciiformes Piciformes

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2021年第2期6卷 314-318页

作者： Shreyansh Shah Li Liang Durgesh Bhandary Saga johansson Eric E Smith Deepak L Bhatt Gregg C Fonarow Naeem D Khan Eric Peterson Janet Prvu Bettger Department of Neurology Duke University School of MedicineDurhamNorth CarolinaUSA Duke Clinical Research Institute DurhamNorth CarolinaUSA AstraZeneca UK Ltd CambridgeUK Hotchkiss Brain Institute and Department of Clinical Neurosciences University of CalgaryCalgaryAlbertaCanada Division of Cardiology Brigham and Women's HospitalBostonMassachusettsUSA Division of Cardiology Ronald Reagan UCLA Medical CenterLos AngelesCaliforniaUSA

Background Long-term outcomes for Medicare beneficiaries hospitalised with transient ischaemic attack(TIA)and role of ABCD^(2) score in identifying high-risk individuals are not *** We identified 40825 Medicare beneficiaries hospitalised from 2011 to 2014 for a TIA to a Get With The Guidelines(GWTG)-Stroke hospital and classified them using ABCD^(2)s of mortality and rehospitalisation(all-cause,ischaemic stroke,haemorrhagic stroke,myocardial infarction,and gastrointestinal and intracranial haemorrhage)for high-risk versus low-risk groups adjusted for patient and hospital *** Of the 40825 patients,35118(86%)were high risk(ABCD^(2)≥4)and 5707(14%)were low risk(ABCD^(2)=0-3).Overall rate of mortality during 1-year follow-up after hospital discharge for the index TIA was 11.7%,44.3% were rehospitalised for any reason and 3.6%were readmitted due to *** with ABCD^(2) score≥4 had higher mortality at 1 year than not(adjusted HR 1.18,95%CI 1.07 to 1.30).Adjusted risks for ischaemic stroke,all-cause readmission and mortality/all-cause readmission at 1 year were also significantly higher for patients with ABCD^(2) score≥4 vs *** contrast,haemorrhagic stroke,myocardial infarction,gastrointestinal bleeding and intracranial haemorrhage risk were not significantly different by ABCD^(2) *** This study validates the use of ABCD^(2) score for long-term risk assessment after TIA in patients aged 65 years and *** efforts for community-based follow-up care after TIA are needed for ongoing prevention in Medicare beneficiaries who were hospitalised for TIA.

关键词： admitted score prevention

味觉厌恶性条件反射建立后脑内c-Fos的表达

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

心理学报 2000年第4期32卷 433-437页

作者：杨杰,林文娟,Joshua johansson,郑丽,谭会兵中国科学院心理研究所脑-行为研究中心!北京 100101 中国科学院心理研究所脑-行为研究中心!北京 100101 Michigan University Ann Arbor! MI 48109 U.S.A. 中国科学院心理研究所脑-行为研究中心!北京 100101 中国协和医科大学基础研究所!北京 100730

以新异味觉刺激糖精水的摄入为条件刺激，以腹腔注射环磷酰胺（ＣＹ，免疫抑制剂）或氯化锂（ＬｉＣｌ）为非条件刺激，分别使大鼠建立味觉厌恶性条件反射。在条件刺激日，糖精水在学习组大鼠下列脑区中诱发出密集的Ｆｏｓ表达：下丘脑... 详细信息

以新异味觉刺激糖精水的摄入为条件刺激，以腹腔注射环磷酰胺（ＣＹ，免疫抑制剂）或氯化锂（ＬｉＣｌ）为非条件刺激，分别使大鼠建立味觉厌恶性条件反射。在条件刺激日，糖精水在学习组大鼠下列脑区中诱发出密集的Ｆｏｓ表达：下丘脑、杏仁核、边缘皮质等，而非学习组在这些区域中却没有或只有少量表达。另外，在丘脑前背侧核、扣带回、下丘脑外侧核、穹隆下器、压部后颗粒皮质、视上核，ＣＹ组的Ｆｏｓ表达明显多于ＬｉＣ１组；而在伏核、杏仁基底外侧核、腹外侧隔核，ＬｉＣｌ组的Ｆｏｓ表达明显多于ＣＹ组，这种差异可能是两种药物的不同药理性质所致。

关键词：味觉厌恶性条件反射 c-Fos 环磷酰胺氯化锂。

Comparison of four non-alcoholic fatty liver disease detection scores in a Caucasian population

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2020年第4期12卷 149-159页

作者： Lars Lind Lars johansson Hakan Ahlstrom Jan W Eriksson Anders Larsson Ulf Risérus Joel Kullberg Jan Oscarsson Department of Medical Sciences UppsalaUniversityUppsala 75185Sweden Antaros Medical AB BioVenture HubMolndal 43153Sweden Department of Surgical Sciences Uppsala UniversityUppsala 75185Sweden Department of Public Health and Caring Sciences Clinical Nutrition and Metabolism Uppsala UniversityUppsala 75122Sweden Global Medicines Development AstraZenecaMoIndal 43150Sweden

BACKGROUND Non-alcoholic fatty liver disease(NAFLD)is a common disorder,with an estimated prevalence ranging from 20%to 35%in the general *** scores based on easily measurable biochemical and clinical parameters,including the fatty liver index(FLI),hepatic steatosis index(HSI),lipid accumulation product(LAP),and NAFLD liver fat score(LFS),have been developed for the detection of ***,comparative information regarding the efficacy of these scores for predicting NAFLD in population-based samples comprising normal and high-risk individuals is *** To evaluate four NAFLD detection scores in two samples with different NAFLD *** NAFLD screening was performed in a population-based sample of 50-year-old individuals in Uppsala,Sweden[n=310;Prospective investigation of obesity,energy and metabolism(POEM)study]and a high-risk population comprising patients with a body mass index>25 kg/m2 and either high plasma triglycerides(≥1.7 mmol/L)or type 2 diabetes(n=310;EFFECT studies).NAFLD was defined as liver fat>5.5%using magnetic resonance imaging-proton density fat ***,HSI,LAP,and NAFLD LFS were assessed.A logistic regression model was used to evaluate the effectiveness of the different *** The prevalence of NAFLD was 23%in *** showed the highest receiver operating characteristic area under the curve(ROC AUC;0.82)and was significantly better than the LAP score(P=0.005 vs LAP,P=0.08 vs LFS,P=0.12 vs HSI)for detection of *** other three indices performed equally in POEM(0.77-0.78).The prevalence of NAFLD was 74%in EFFECT;LFS performed best(ROC AUC 0.80)in this *** ROC AUC for LFS(0.80)was significantly higher than that for FLI(P=0.0019)and LAP(P=0.0022),but not HSI(P=0.11).We performed a sensitivity analysis with stratification for the two high-risk subgroups(patients with diabetes or hypertriglyceridemia)from the EFFECT *** performed best in patients with *** major differences

关键词： Comparison EFFECT studies Fatty liver Non-alcoholic fatty liver disease Non-invasive indices Screening

Na Induced Changes in the Electronic Band Structure of Graphene Grown on C-Face SiC

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Graphene 2013年第1期2卷 1-7页

作者： Leif I.johansson Chao Xia Chariya Virojanadara Department of Physics Chemistry and BiologyLinkoping UniversityLinkopingSweden

Studies of the effects induced on the electron band structure after Na deposition, and subsequent heating, on a C-face 2 MLs graphene sample are reported. Na deposition shifts the Dirac point downwards from the Fermi level by about 0.5 eV due to electron doping. After heating at temperatures from around 120℃ to 300℃,thep-band appears considerably broadened. Collected Si 2p and Na 2p spectra then indicate Na intercalation in between the graphene layers and at the graphene SiC interface. The broadening is therefore interpreted to arise from the presence of two slightly shifted, but not clearly resolved,p-bands. Constant energy photoelectron distribution patterns, E(kx,ky);s, extracted from the clean 2MLs graphene C-face sample look very similar to earlier calculated distribution patterns for monolayer, but not Bernal stacked bilayer, graphene. After Na deposition the patterns extracted at energies below the Dirac point appear very similar so the doping had no pronounced effect on the shape or intensity distribution. At energies above the Dirac point the extracted angular distribution patterns show the flipped, “mirrored”, intensity distribution predicted for monolayer graphene at these energies. An additional weaker outer band is also discernable at energies above the Dirac point, which presumably is induced by the deposited Na.

关键词： Graphene on C-Face SiC Graphene Band Structure Na Intercalation Constant Energy Photoelectron Angular Distribution Patterns

Deformation behaviour in advanced heat resistant materials during slow strain rate testing at elevated temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2014年第4期4卷 20-25页

作者： Mattias Calmunger Guocai Chai Sten johansson Johan Moverare Division of Engineering Materials Department of Management and EngineeringLink?ping UniversitySE-58183 Link?ping Sweden Sandvik Materials Technology Strategy researchSE-81181 Sandviken Sweden

In this study, slow strain rate tensile testing at elevated temperature is used to evaluate the influence of temperature and strain rate on deformation behaviour in two different austenitic alloys. One austenitic stainless steel （AISI 316L） and one nickel-base alloy （Alloy 617） have been investigated. Scanning electron microscopy related techniques as electron channelling contrast imaging and electron backscattering diffraction have been used to study the damage and fracture micromechanisms. For both alloys the dominante damage micromech- anisms are slip bands and planar slip interacting with grain bounderies or precipitates causing strain concentrations. The dominante fracture micromechanism when using a slow strain rate at elevated temperature, is microcracks at grain bounderies due to grain boundery embrittlement caused by precipitates. The decrease in strain rate seems to have a small influence on dynamic strain ageing at 650℃.

关键词： dynamic strain ageing slow strain rate tensile testing fracture damage

Efficient observability verification for large-scale Boolean control networks

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient observability verification for large-scale Boolean...