检索结果-南通市图书馆

Forest Ecosystems 2023年第5期10卷 635-645页

作者： Václav Zumr oto nakládal Lukás Bílek JiríRemes Czech University of Life Sciences Prague Faculty of Forestry and Wood SciencesKamýcka 129Praha 6–Suchdol16500Czech Republic

Snags are an important component of beech forests that promote ***,their occurrence is completely marginal in managed *** snags in these stands would greatly enhance *** investigated whether snag dimensions were important for saproxylic beetle richness since they were easily transferable parameters to forest management and assessed the presence of other snag microhabitats affecting beetle *** collection was performed using passive flight traps placed on thirty snags in a recent beech reserve.A total of 6706 adults belonging to 231 saproxylic species(53 Red List species,23%)were *** results showed that the most important snag parameters were the diameter(thickness)and canopy openness of the surrounding *** occurrence of Fomes fomentarius,the volume of snag and decay class 3 were marginally significant in terms of the preference of all saproxylic *** diversity was reduced by an advanced degree of decay and a surprisingly deep stem *** dividing snag thickness into categories(70 cm DBH),we found that categories with snag diameter greater than 35 cm showed little differences in all saproxylic and Red List species richness and diversity indices and exhibited the highest similarity in beetle *** recommendations to forest managers in terms of optimization and simplification of practical procedures,we suggest actively creating high stumps to act as snags greater than 35 cm in DBH diameter to promote biodiversity in beech management stands.

关键词： Deadwood Coleoptera Biodiversity Active management Endangered beetles

Deadwood position matters:Diversity and biomass of saproxylic beetles in a temperate beech forest

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

Forest Ecosystems 2024年第1期11卷 120-130页

作者： Vaclav Zumr oto nakladal Josef Gallo JiríRemes Faculty of Forestry and Wood Sciences Czech University of Life Sciences PragueKamýck a 129Praha 6-Suchdol16500Czech Republic

Deadwood plays a key role for biodiversity in forests.A significant number of beetles from this group are currently listed as endangered in the Red *** addition to other management recommendations,there have been recent efforts to enrich stands with dead wood to promote *** important parameter for forestry enterprises is the optimization of these *** study investigated the abundance,species richness,gamma diversity,conservation value and biomass of saproxylic beetles in natural forests using window traps.A total of 89traps were used for saproxylic beetle monitoring,of which 29 were placed on lying logs,30 on snags and 30 as controls in forest stand space.A total of 35,011 beetles were recorded in 564 species(61 families).Notably,20,515 of these belong to saproxylic beetles(59%)in 311 species(55%),with 62 classified as Red-List species(20%).In the group of'all saproxylic beetles',the results indicate that a diversity and y diversity(q=0)remain consistent across various deadwood types,whileβdiversity showed significant *** differences were found in the Red-List species group,where a diversity and y diversity differed,with higher values observed in *** based total species richness of site was estimated to be 391 species,including 74 Red-Listed *** the sample coverage of the studied stand categories showed that all saproxylic species exhibit a pronounced preference for inhabiting areas featuring lying ***,Red-List species mainly inhabit snags,withβdiversity being more similar to snags and forest stand ***,both the conservation value(weighted average by conservation status)and beetle biomass are significantly highest in snags,whereas stand space shows the lowest values across all measured saproxylic beetle ***,the use of traps set on the poles in forest stand space resulted in an underestimation of the actual stand richness by 20%-25%.Our results support th

关键词： Snags Coleoptera Fagus sylvatica Unmanaged forests Red-list Coarse woody debris

Diversity of click beetles in managed nonnative coniferous and native beech stands: Consequences of changes in the structural and species composition of tree stands in Central Europe

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

Forest Ecosystems 2022年第5期9卷 596-605页

作者： Václav Zumr oto nakladal JiríRemes Tereza Brestovanska Váaclav Zumr Czech University of Life Sciences Prague Faculty of Forestry and Wood SciencesKamýcka 129Praha 6Suchdol16500Czech Republic The Silva Tarouca Research Institute for Landscape and Ornamental Gardening Kvetnove namestí391Průhonice25243Czech Republic SC*** Czech Republic

The natural composition of forests has undergone significant changes over recent centuries.A closer-to-natural tree species composition has long been perceived as key to a high *** investigated the impact on communities of click beetles(Elateridae)caused by changes in the tree species composition of spruce monocultures compared to reference sites of recently unmanaged natural beech *** collect data,passive interception traps were distributed within managed spruce stands of different age classes and natural beech forests of various developmental *** beetle species richness was slightly but not significantly higher in the beech *** saproxylic species group was significantly more common in the spruce stands,whereas the group of nonsaproxylic species was significantly more abundant in the beech *** the commercial stands,the significantly highest species richness was in the clearings(0–10-year-old stands),and at this forest age class,the vast majority of the beetle species occurred in the spruce *** the developmental stages of the natural forest,a slightly higher beetle richness was found at the disintegration *** study results suggested that different tree species compositions and stand structures affect the communities of click beetles and substantially change their species composition and thus their response to external ***,management of stands using diverse silvicultural systems is recommended for creating diverse ecological niches in forests.

关键词： Species richness Forest management Saproxylic beetles Nonsaproxylic beetles Dead wood Elateridae Canopy openness

Enhancement of the ‘tractor-beam’ pulling force on an optically bound structure

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

Light(Science & Applications) 2017年第1期6卷 136-141页

作者： Jana Damková Lukáš Chvátal Jan Ježek Jindřich Oulehla oto Brzobohatý Pavel Zemánek Institute of Scientific Instruments of the CAS v.v.i.Královopolská147Brno 61264Czech Republic

Recently,increasing attention has been devoted to mastering a new technique of optical delivery of micro-objects tractorbeam’1–*** beams have uniform intensity profiles along their propagation direction and can exert a negative force that,in contrast to the familiar pushing force associated with radiation pressure,pulls the scatterer toward the light *** was experimentally observed that under certain circumstances,the pulling force can be significantly enhanced6 if a non-spherical scatterer,for example,a linear chain of optically bound objects10–12,is optically *** we demonstrate that motion of two optically bound objects in a tractor beam strongly depends on theirs mutual distance and spatial *** configuration-dependent optical forces add extra flexibility to our ability to control matter with *** these interactions opens the door to new applications involving the formation,sorting or delivery of colloidal self-organized structures.

关键词： beam scatter mutual

Utilization of Data Communication according to the IEC61850 Standard for Nuclear Power Plant Electrical Equipment Testing

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 Energy and Power Engineering 2014年第4期8卷 765-769页

作者： Milos Kaska oto Marecek TES s.r.o. Trebic 674 01 Czech Republic

This paper deals with an integration of directly measured electrical parameters with data acquired by data communication from protections and terminals into an advanced monitoring system. Based on the periodic test, the authors of this paper present the possibility of an extended evaluation and more accurate analysis of transient and failure events. For periodical testing, as implemented during the commissioning of power plants in the Czech Republic, a monitoring system of electrical equipment has been used, to record the courses of important electrical parameters and thus, proving the proper functioning of complex technological systems in various operation modes. Data from monitoring system were used to prove the successful results of the test or as a base data for further analysis of failures. The monitoring system has proved itself as a very useful device also when recording unexpected failure events, the cause of which was very quickly and accurately detected by the follow-up analysis. Initially, only the voltage and current data from measuring transformers, analogue transducers and contact relays were used as input data for the monitoring system. After the implementation of new digital protection technology and controlling terminals with inner data recorder, the data from digital devices could be also utilized for the monitoring system.

关键词： Power plant data communication emergency source transient failure terminal electrical protection.

Multi-parametric MR imaging of transition zone prostate cancer: Imaging features, detection and staging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Radiology 2010年第5期2卷 180-187页

作者： Arda Kayhan Jacob Oommen Aytekin oto Department of Radiology University of Chicago

Magnetic resonance (MR) imaging has been increasingly used in the evaluation of prostate cancer. As studies have suggested that the majority of cancers arise from the peripheral zone (PZ), MR imaging has focused on the PZ of the prostate gland thus far. However, a considerable number of cancers (up to 30%) originate in the transition zone (TZ), substantially contributing to morbidity and mortality. Therefore, research is needed on the TZ of the prostate gland. Recently, MR imaging and advanced MR techniques have been gaining acceptance in evaluation of the TZ. In this article, the MR imaging features of TZ prostate cancers, the role of MR imaging in TZ cancer detection and staging, and recent advanced MR techniques will be discussed in light of the literature.

关键词： Multi-parametric magnetic resonance imaging Prostate cancer Transition zone

An Asymptotic Distribution Function of the Three-Dimensional Shifted van der Corput Sequence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2014年第15期5卷 2334-2359页

作者： Jana Fialová Ladislav Misk oto Strauch Mathematical Institute Slovak Academy of SciencesBratislavaSlovakia Department of Mathematics University of OstravaOstravaCzech Republic

In this paper, we apply the Weyl's limit relation to calculate the limit ,?where γq (n) is the van der Corput sequence in base q, g (x, y, z),?is the asymptotic distribution function of (γq (n), γq (n +1), γq (n +... 详细信息

关键词： Sequences Arithmetic Means Riemann-Stieltjes Integraion

Effect of age and plaque morphology on diagnostic accuracy of dual source multidetector computed tomography coronary angiography

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 Geriatric Cardiology 2014年第2期11卷 106-112页

作者： Hamza Sunman Kudret Aytemir Hikmet Yorgun Ugtr Canpolat Ali Taher Edis Demiri Tuncay Hazlrolan Levent Sahiner Ergun B.Kaya Giray Kabakci Lale Tokgozoglu Ali oto Department of Cardiology Ministry of Health Diskapi Yildirm Beyazit Education and Research Hospital06110AnkaraTurkey Department of Cardiology Hacettepe University Faculty of MedicineSihhiye06100AnkaraTurkey Department of Cardiology Turkiye Yuksek Ihtisas Hospital06100AnkaraTurkey Department of Radiology Hacettepe University Faculty of MedicineSihhiye06100AnkaraTurkey

BackgroundMultidetector 计算了冠的 angiography 代表的断层摄影术(MDCT ) 在心脏的成像和它的最令人激动的工艺的革命之一逐渐地在冠的动脉疾病的诊断被使用了。这研究的目的是调查年龄的效果， *** 病人的诊断精确性上的冠的匾石灰... 详细信息

BackgroundMultidetector 计算了冠的 angiography 代表的断层摄影术(MDCT ) 在心脏的成像和它的最令人激动的工艺的革命之一逐渐地在冠的动脉疾病的诊断被使用了。这研究的目的是调查年龄的效果， *** 病人的诊断精确性上的冠的匾石灰化被使用双来源的 MDCT 和常规冠的 angiography 检验。MDCT 结果关于严厉被分析(>；50% 狭窄) 并且形态学(非钙化，混合，或钙化) 冠的动脉粥样硬化患者，在 16 片断 *** 评估的匾总计，有 2,687 个冠的动脉片断的 181 个病人(94 个男人和 87 个女人) 与 MDCT 被检查。90 三个病人比 65 岁老(组 A， 42 个男人) 并且 88 更年轻(组 B， 52 个男人) 。二 -- 因为小远侧的冠的容器片断或运动人工制品， 109 个冠的动脉片断(7.2%) 被排除。有非诊断的图象质量的片断的全面数字在两组病人是类似的。2,687 个评估片断，(5.8%) 157 是显著地 diseased，并且他们中的 144 个被 MDCT 正确地检测。诊断评估证明敏感，积极预兆的价值，特性，和否定预兆的价值是 89.5% ， 62.5% ， 96.0% ，和 99.2% ，分别地在组 A，并且 95.2% ， 64.8% ， 97.5% ，和 99.8% 在组 B 分别地。另外，在两个组与非钙化的、混合并且钙化的匾在冠的片断详细说明了基于片断的分析是在这研究观察的高诊断的精确性建议的类似的诊断 *** 那 MDCT 冠的 angiography 能是为更年轻的病人而且为更老的病人的一个合适的诊断工具不仅。

关键词： Age Calcification Coronary artery disease Computed tomography

Magnetic resonance enterography in Crohn’s disease: Standard and advanced techniques

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Radiology 2010年第4期2卷 113-121页

作者： Arda Kayhan Jacob Oommen Farid Dahi Aytekin oto Department of Radiology University of Chicago

Crohn's disease (CD) is a chronic autoimmune disorder that affects mainly young people. The clinical management is based on the Crohn's Disease Activity Index and especially on biologic parameters with or without additional endoscopic and imaging procedures, such as barium and computed tomography examinations. Recently, magnetic resonance (MR) imaging has been a promising diagnostic radiologic technique with lack of ionizing radiation, enabling superior tissue contrast resolution due to new pulse-sequence developments. Therefore, MR enterography has the potential to become the modality of choice for imaging the small bowel in CD patients.

关键词： Crohn’s disease Magnetic resonance enterography Advantages Pulse sequences Advanced techniques

Multiple progressive focal nodular hyperplasia lesions of liver in a patient with hemosiderosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Radiology 2010年第10期2卷 405-409页

作者： Arda Kayhan Nanda Venu Hatice Lakadamyall Donald Jensen Aytekin oto Department of Radiology Namlk Kemal University Department of Gastroenterology University of Chicago Department of Radiology Baskent University Department of Radiology University of Chicago

Focal nodular hyperplasia(FNH) is the second most common benign lesion of the *** is a solitary lesion and usually does not *** present the magnetic resonance imaging findings of multiple progressive FNH lesions in a patient with hemosiderosis using GadoliniumEOB-DTPA(Eovist) as a hepatobiliary contrast *** possible mechanisms underlying the occurrence and progression of FNH lesions and the potential value of Eovist in characterizing the lesions were discussed.

关键词： Focal nodular hyperplasia Hemosiderosis Magnetic resonance imaging Gadolinium-EOB-DTPA