检索结果-南通市图书馆

Determinants of the impact of blood pressure variability on neurological outcome after acute ischaemic stroke

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2017年第1期2卷 1-6页

作者： Adam de Havenon Alicia Bennett Gregory j Stoddard Gordon Smith Lee Chung Steve O’Donnell j Scott McNally David Tirschwell jennifer j Majersik Department of Neurology University of UtahSaltLake CityUtahUSA University of Utah SaltLake CityUtahUSA University of washington SeattleWashingtonUSA

Introduction: Increased blood pressure variability (BPV) is detrimental after acute ischaemic stroke, but the interaction between BPV and neuroimaging factors that directly influence stroke outcome has not been explored. Methods: we retrospectively reviewed inpatients from 2007 to 2014 with acute anterior circulation ischaemic stroke, CT perfusion and angiography at hospital admission, and a modified Rankin Scale (MRS) 30- 365 days after stroke onset. BPV indices included SD, coefficient of variation and successive variation of the systolic blood pressure between 0 and 120 hours after admission. Ordinal logistic regression models were fitted to MRS with predictor variables of BPV indices. Models were further stratified by CT perfusion volumetric measurements, proximal vessel occlusion and collateral score. Results: 110 patients met the inclusion criteria. The likelihood of a 1-point rise in the MRS increased with every 10 mm Hg increase in BPV (OR for the 3 BPV indices ranged from 2.27 to 5.54), which was more pronounced in patients with larger ischaemic core volumes (OR 8.37 to 18.0) and larger hypoperfused volumes (OR 6.02 to 15.4). This association also held true for patients with larger mismatch volume, proximal vessel occlusion and good collateral vessels. Conclusions: These results indicate that increased BPV is associated with worse neurological outcome after stroke, particularly in patients with a large lesion core volume, concurrent viable ischaemic penumbra, proximal vessel occlusion and good collaterals. This subset of patients, who are often not candidates for or fail acute stroke therapies such as intravenous tissue plasminogen activator or endovascular thrombectomy, may benefit from interventions aimed at reducing BPV.

关键词： impaired perfusion cerebral

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

工作气体对MRPC性能影响的研究(英文)

高能物理与核物理 2004年第7期28卷 733-737页

作者：邵明陈宏芳李澄汪晓莲黄胜利李洁阮丽娟伍健许咨宗汪兆民 G.Eppley w.j.Llope F.Geurts j.Schambach 中国科学技术大学近代物理系合肥230026 Rice University Houston University of Texas

多气隙电阻板室 (MRPC)飞行时间探测器模型从 2 0 0 3年 2月开始在美国布鲁克海文国家实验室(BNL)的AGS束流上顺利完成了为期 10周的测试 (共 2 8个MRPC模块 16 8路读出 ,其中 12个模块即 72个读出道配置了读出电子学 ) .实验表明工作... 详细信息

多气隙电阻板室 (MRPC)飞行时间探测器模型从 2 0 0 3年 2月开始在美国布鲁克海文国家实验室(BNL)的AGS束流上顺利完成了为期 10周的测试 (共 2 8个MRPC模块 16 8路读出 ,其中 12个模块即 72个读出道配置了读出电子学 ) .实验表明工作气体的选择对MRPC的工作性能有很大影响 .测量了几种不同成分的混合气体 (A) 90 %C2 H2 F4+5 %iso C4H10 +5 %SF6、(B) 95 3%C2 H2 F4+4 7%iso C4H10 及 (C) 10 0 %C2 H2 F4下MRPC探测效率和时间分辨等特性的变化。

关键词：多气隙电阻板室混合气体探测效率时间分辨流光几率高能物理实验

PREPARATION OF IRON CARBIDE FROM MAGNETITE PELLETS BY CO-H_2 MIXTURES REDUCTION

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2001年第4期14卷 280-284页

作者： H. w Ni1), D.Q. Cang2) and j.P. jiang2) 1) School of Materials and Metallurgy, wuhan University of Science and Technology, wuhan 430081, China 2) School of Metallurgy, University of Science and Technology Beijing, Beijing 100083, Chi Sch. of Mat. Wuhan Univ. of Sci. and Technol. Wuhan 430081 China

A method of preparing iron carbide by reducing magnetite pellets with H2-CO mixtures is presented. The results show that an over 90 percent conversion ratio of iron carbide can be reached at 973 K and 1073 K under the suitable atmosphere. The reaction process to prepare iron carbide from magnetite pellets can be divided into two stages: reduction of magnetite pellets and carburization of reduction products. The carbon deposition has a great influence on the formation of iron carbide. In order to get a high conversion ratio of iron carbide, the relative weight loss value (m) should be controlled between 0.5 to 0.8.

关键词： Carbides Fabrication Magnetite Ore pellets Reduction

Understanding stakeholder preferences for managing red foxes in different situations

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2020年第1期9卷 222-235页

作者： Vasilios Liordos Vasileios j.Kontsiotis Foteini Emmanouilidou Department of Forestry and Natural Environment International Hellenic UniversityP.O.Box 17266100 DramaGreece

Background:Red foxes(Vulpes vulpes)have historically been interacting with human societies,thus being an important component of socio-ecological *** Greece,farmers and hunters have been increasingly complaining about predation of red foxes on livestock and game,and the recurrence of rabies incidents has raised concerns about human and animal *** public preferences about management is necessary for successful wildlife *** study aimed at investigating the preferences of north Greece residents for managing the negative impacts of red foxes and also at understanding variation between stakeholder groups:farmers,hunters,farmers-hunters,and the general *** were collected from on-site face-to-face surveys(n=746),between March and May *** were asked to rate their acceptability of management strategies under three impact scenarios:red foxes attack livestock,reduce game,and carry ***:Stakeholders preferred nonlethal management strategies,with generally high consensus,both between and within *** and compensation were the most acceptable strategies for protecting livestock and vaccination and the removal of sick animals for eliminating *** and consensus for lethal strategies were lower,with hunting being the most acceptable lethal strategy for hunters,especially when foxes threatened game or carried *** nothing was becoming more unacceptable and lethal control more acceptable with increasing severity of the impacts,i.e.,livestock and game predation versus rabies ***:Variation in the acceptability of and consensus for management strategies was considerable among scenarios,and both between and within stakeholder *** implications could be used as a guide for reaching consensus for proper management strategies during the conservation conflict management process in the study *** similar studies are scarce,findings might also prove useful elsewh

关键词： Canids Farmers Hunters Potential for conflict index Conservation conflict management Northeast Mediterranean

Impact of patch size on woody tree species richness and abundance in a tropical montane evergreen forest patches of south India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Forestry Research 2018年第6期29卷 1675-1687页

作者： Dharmalingam Mohandass Mason j.Campbell Priya Davidar Root and Soil Biology Laboratory Department of BotanyBharathiar UniversityCoimbatoreTaminadu 641046India Centre for Tropical Environmental and Sustainability Science(T.E.S.S.) College of Science and EngineeringJames Cook UniversityCairnsQLD 4870Australia Department of Ecology and Environmental Sciences Pondicherry UniversityKalapetPondicherry 605014India

we examined the effects of forest patch size on woody tree species richness and abundance in tropical montane evergreen forest patches of the Nilgiri region,south India. we sampled woody trees(>1 cm dbh) from 21 forest patches in the upper Nilgiri hills(> 2000 m elevation) and recorded a total of 35,146 individuals of 61 species, 45 genera and 30 families. Species richness and abundance of sapling/shrubs(≥ 1 to with increasing patch size, but the species richness and abundance of small, medium and larger trees(≥ 10 to with increasing patch size but edge species richness did not. Species richness and abundance of shade-tolerant and shade-demanding tree species also increased with increasing patch size. The abundance of zoochory dispersed tree species was significantly related to increasing patch size, but those dispersed by autochory did not display any clear relationship between patch size and species richness or *** findings suggest that with increasing forest patch area,tree compositional patterns may be driven by species specific shade-tolerance adaptations and dispersal *** responses in these traits by the plant community within the individual habitat zones of forest edge and interiors likely plays a major role in determining the inherent plant community and thus the subsequent ecological processes of forest patches, including their responses to increasing patch area.

关键词： Dispersal mode Forest fragments Shade-tolerance Species–area relationships western Ghats

Bioacoustic variation of swimbladder disturbance sounds in Neotropical doradoid catfishes （Siluriformes： Doradidae, Auchenipteridae）： Potential morphological correlates

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2012年第1期58卷 171-188页

作者： Kaatz, Ingrid M. Stewart, Donald j. Department of Environmental and Forest Biology SUNY College of Environmental Science and Forestry Syracuse NY 13210 USA

Swimbladder disturbance sounds of doradoid catfishes （Doradidae and Aucheniptefidae） demonstrated striking waveform and spectrographic variation. we surveyed sounds of 25 doradoid species in 20 genera comparing these to sounds of four vocal outgroup catfish families. Sounds were either continuous waveforms （lacking interpulses） or pulsed （groups of pulses repeated at fixed temporal intervals）. This is the first evidence for swimbladder calls with fixed interpulse patterns in catfishes. Vocal mechanism components that were similar between doradids and auchenipterids included： swimbladder shape, swimbladder dimensions and sonic muscle-somatic index. Morphological traits that showed variation among taxa and were evaluated for po- tential correlates of call diversity are： 1） diverticula （marginal outpocketings of the swimbladder with no connection to inner ear） and 2） elastic spring apparatus Mtillerian rami （ESA-Mr）. within the doradid subfamilies and within the Auchenipteridae most species differed significantly in dominant frequency with frequency ranges overlapping to some extent for most. Doradid swim- bladder diverticula did not explain dominant frequency variation within the doradoid superfamily. Some doradids with conical ESA-Mr had the highest dominant frequency sounds. Auchenipterids included both relatively lower and higher dominant fre- quency sound producers but lacked diverticula and had discoidal ESA-Mr. Comparing a phylogeny of doradoid genera with out- group taxa, we infer that complex diverticula and conical ESA-Mr are derived characters within the Doradidae. Species repre- senting outgroup families produced either continuous lower dominant frequency sounds （aspredinids, mochokids and pseudopimelodids） or pulsed higher dominant frequency sounds （pimelodids） [Current Zoology 58 （1）： 171-188, 2012].

关键词： Catfishes Communication Signal evolution Vocal mechanisms

Experimental Study and Numerical Simulation of the Casting-Forging Complex Near Net Forming of Alternator Claw-pole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

上海交通大学学报 2004年第Z2期38卷 79-82页

作者： j.L.Song D.j.Hu Q.C.wang H.Q.Chen H.G.Guo School of Mechanical and Power Engineering Shanghai Jiaotong University Shanghai200030 China Scool of Materials Science and Engineering Taiyuan Heavy Machinery Institute Taiyuan030024 China School of Mechanical and Power Engineering Shanghai Jiaotong University Shanghai200030 China Scool of Materials Science and Engineering Taiyuan Heavy Machinery Institute Taiyuan030024 China Scool of Materials Science and Engineering Taiyuan Heavy Machinery Institute Taiyuan030024 China Scool of Materials Science and Engineering Taiyuan Heavy Machinery Institute Taiyuan030024 China

As a newly developed precision technology, casting-forging complex near net forming process is utilized to produce complex components with a short lead time, low cost and high precision, thus to accelerate the response speed of the market and enhance the competitive power of products. In this paper, the casting-forging complex near net forming process of alternator claw pole was developed and investigated with a combination of experimental and numerical simulation method. Qualified near net workpiece was manufactured, mechanical parameter and relative field information during the forming process was also obtained. while the alternator claw-pole is processed with this technology, the forming force is small, the process is short and the quality of forgings is perfect. Therefore, the complex casting-forging near net forming process of claw-pole is an energy and material saving technology, which will have a vast developing and application prospect in the future.

关键词： alternator claw-pole casting-forging near net forming numerical simulation

Recent advances in the study of Mesozoic-Cenozoic petrified wood from Thailand

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第5期16卷 501-506页

作者： Pratueng jINTASAKUL Paul j.GROTE Nareerat BOONCHAI Northeastern Research Center and Museum for Petrified wood and Mineral Resources Nakhon Ratchasima 30000 Thailand Geography ProgramNakhon Ratchasima Rajabhat UniversitySuranarai RoadMuang DistrictNakhon Ratchasima 30000Thailand School of Biology Institute of Science Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Northeastern Research Center and Museum for Petrified wood and Mineral Resources Nakhon Ratchasima 30000 Thailand School of BiologyInstitute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand

Mesozoic to Cenozoic petrified woods are very rich and well preserved in the Khorat Plateau, Northeast Thailand, serving as remarkable material for investigations of tropical vegetation history, paleoclimatic evolution, and paleoenvironmental changes. Our recent field survey and investigations have defined about 50 species of fossil wood assigned to 19 genera and 11 families from Mesozoic to Cenozoic deposits in this region. These woods are ascribed to two groups, gymnosperms and angiosperms. Among them, about 20 species assigned to 7 genera and 5 families are the first reports of the taxa in Thailand. The fossil wood floras indicate that during the late Mesozoic period, the tropical conifer vegetation in Northeast Thailand was dominated by the family Araucariaceae. From the Miocene to Pleistocene, a tropical climate prevailed in this region with perhaps both deciduous and evergreen broadleaf forests comprising the vegetation.

关键词： fossil wood tropical vegetation Mesozoic Cenozoic Thailand.

Genetic alteration and mutation profiling of circulating cell-free tumor DNA(cfDNA) for diagnosis and targeted therapy of gastrointestinal stromal tumors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese journal of Cancer 2016年第7期35卷 342-349页

作者： weixin Yan Aiguo Zhang Michael j.Powell Robotics Research Institute School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240P.R. China DiaCarta Inc. 2600 Hilltop Drive Richmond CA 94806USA

Gastrointestinal stromal tumors(GISTs) have been recognized as a biologically distinctive type of tumor,different from smooth muscle and neural tumors of the gastrointestinal *** identification of genetic aberrations in proto-oncogenes that drive the growth of GISTs is critical for improving the efficacy of cancer therapy by matching targeted drugs to specific *** into the oncogenic mechanisms of GISTs has found that these tumors frequently contain activating gene mutations in either platelet-derived growth factor receptor A(PDGFRA) or a receptor tyrosine protein associated with a mast cell growth factor receptor encoded by the KIT *** cancer subpopulations have the potential to disrupt durable patient responses to molecularly targeted therapy for GISTs,yet the prevalence and size of subpopulations remain largely *** of the cancer subpopulations that harbor low-frequency mutant alleles of target proto-oncogenes through the use of molecular genetic methods,such as polymerase chain reaction(PCR) target amplification technology,is hampered by the high abundance of wildtype alleles,which limit the sensitivity of detection of these minor mutant *** is especially true in the case of mutant tumor DNA derived "driver" and "drug-resistant" alleles that are present in the circulating cell-free tumor DNA(cfDNA) in the peripheral blood circulation of GIST ***-called "liquid biopsy" allows for the dynamic monitoring of the patients' tumor status during treatment using minimally invasive *** methodologies,such as a technology that employs a xenonucleic acid(XNA) clamping probe to block the PCR amplification of wild-type templates,have allowed improved molecular detection of these low-frequency alleles both in tissue biopsy samples and in *** new methodologies could be widely applied for minimally invasive molecular testing in the therapeutic management of GISTs.

关键词：基因突变检测肿瘤治疗靶向治疗遗传变异肥大细胞胃肠道 DNA 间质