2,065 research outputs found
Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides.
No full textTordeur Pol. Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides. . In: L'antiquité classique, Tome 76, 2007. p. 332
Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides.
No full textTordeur Pol. Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides. . In: L'antiquité classique, Tome 76, 2007. p. 332
Tony Woodman et Jonathan Powell (Ed.), Author and Audience in Latin Literature
No full textTordeur Pol. Tony Woodman et Jonathan Powell (Ed.), Author and Audience in Latin Literature. In: L'antiquité classique, Tome 63, 1994. pp. 382-383
Looking back
No full textThese days the Government Architect is an influential consultant, who gets the attention of a number of government ministers. A Government Architect doesnt find much time to do any actual building though, and the same will be true for the new Government Architect, Liesbeth van der Pol, who was appointed in August. A look back at the old-fashioned Government Architects and their predecessors
Spatially coherent diffusion of human RNA Pol II depends on transcriptional state rather than chromatin motion
No full textGene transcription by RNA polymerase II (RNAPol II) is a tightly regulated process in the genomic, temporal, and spatial context. Recently, we have shown that chromatin exhibits spatially coherently moving regions over the entire nucleus, which is enhanced by transcription. Yet, it remains unclear how the mobility of RNA Pol II molecules is affected by transcription regulation and whether this response depends on the coordinated chromatin movement. We applied our Dense Flow reConstruction and Correlation method to analyze nucleus-wide coherent movements of RNA Pol II in living human cancer cells. We observe a spatially coherent movement of RNA Pol II molecules over [Image: see text] 1 μm, which depends on transcriptional activity. Inducing transcription in quiescent cells decreased the coherent motion of RNA Pol II. We then quantify the spatial correlation length of RNA Pol II in the context of DNA motion. RNA Pol II and chromatin spatially coherent motions respond oppositely to transcriptional activities. Our study holds the potential of studying the chromatin environment in different nuclear processes
Detecting plume-driven polynyas from dual-pol SAR imagery
No full textAntarctic ocean temperatures are rising due to climate change, causing land ice to melt at increasingly higher rates. Ice shelf bottom melt is a key factor responsible for Antarctic ice mass loss and as such understanding melt processes in the Antarctic is therefore key to more accurately predict how the global sea level will respond to climate change in the foreseeable future. Basal melt results in the formation of both basal melt channels underneath an ice shelf and persistent sea ice wakes (named plume-driven polynyas) at the ice shelf shoreline. The goal of this research is to develop a method that can help to automatically infer basal melt locations along the Antarctic shoreline with significantly increased spatio-temporal resolution compared to previously researched basal melt detection methods.We infer basal melt locations by detecting plume-driven polynyas. We used dual-pol (HH/HV) Sentinel-1 EW SAR data (40x40m resolution) in combination with GLCM textural features as input for a random forest classification that differentiates images as water or ice in four sub-classes: undisturbed ’open’ water, disturbed ’rough’ water, sea ice and (floating) land ice. We assessed what the advantages and limitations of this approach were for plume-driven polynya detection by performing water-ice (sub-class) classifications and examining which GLCM features proved most useful, what GLCM window size is preferred, and how classification can be aided by post-processing classified images.We computed GLCM textures for window sizes w = [5,11,21] and created a classifier for each choice (GLCM5, GLCM11 and GLC21) and compared results to a classifier based on original dual-pol SAR data (BASE). Via cross validated recursive feature elimination we determined that ’sum average’ (HH and HV polarization) and ’difference variance’ (HV polarization) were most useful for separation of water and ice classes (HH_savg, HV_savg and HV_dvar). Our results have shown that using GLCM texture based dual-pol classifiers improves water-ice classification significantly compared to dual-pol only classifiers, although using HH_savg and HV_savg instead of orignal dual-pol data comes at a cost of reduced spatial resolution. Water-ice classification accuracy of BASE was 92.2% (kappa = 84.4%) was increased to 95.9% (kappa = 91.5%) for GLCM5, 96.3% (kappa = 92.7%) for GLCM11 and to 96.5% (kappa = 93.0%) for GLCM21. From a spatial context, GLCM21 showed an insufficient ability to detect small-scaled bodies of water at a sub-kilometer scale. GLCM5 showed unsatisfactory results in terms of sea ice classification. GLCM11 showed highest robustness in both these performance aspects and proved to be most successful classifier for the application of polynya detection. Using an area filter as a post-processing step proved successful when a classifier is based on GLCM data with a window size no larger than w=11. Noise output (small regions of falsely classified open water pixels) was heavily reduced via this form of post-processing and significantly increased polynya detection performance.The final classified product however still contained too many incorrectly classified water regions of similar spatial scales as plume-driven polynyas to be able to apply this algorithm as a reliable automated polynya detection method. We urge to build upon this SAR-based detection method, by using additional non-GLCM input features or using extra post-processing steps, such as temporally filtering water body presence, until results are satisfactory for a fully automated plume-driven polynya detection algorithm. The method presented here has the potential to make detection significantly faster, easier and more accessible than the current methods available. Lastly, in its current state, this method can already be used to validate predicted locations of basal melt by ocean-ice sheet models and DEM-based methods
[[alternative]]On the Critical Path of Van der Pol equation
No full text[[abstract]]在本文中，我們探討范得坡方程式x''+μx'(x^2-1)+x=0在相平面上的一
條特殊軌線 記為y_(∞)(x;μ)，它是范得坡方程式在相平面上的極限
環在某區域中的漸近解。我 們證明在相平面的上半平面中，當μ →
+∞，對於[-1,0]區間中的每個 x，極限環與 y_(∞)(x;μ)的y座標差至
多為O(μ^(-1/3))；更進一步，應用這個結果，可以證明 當μ →
+∞，相平面上每一條從 y 軸出發且在極限環外部的范得坡方程式的軌線
，自 第一次與 x=1 相交於第四象限之後，其與極限環的誤差至多為O(μ
^(-1/3))。
This article is concerned with the special trajectory y_(∞)(x;
μ) which is the leading term of the asymptotic solution
of Van der Pol equation x''+μx'(x^2-1)+x=0 in the phase
plane for some region. We show that in the phase plane,
the difference of this asymptotic solution and the limit
cycle, y_(p)(x), of Van der Pol equation is not greater than
O(μ^(-1/3)) as μ → +∞ for all -1 < x < 0, and use this
result to show that every trajectory of Van der Pol equation
starting from y-axis with initial value bigger than that
of the limit cycle gets close to the limit cycle by O(μ
^(-1/3)) from its first time on for intersecting x=1 in the
fourth quadrant as μ → +∞.
This article is concerned with the special trajectory y_(∞)(x;
Complete set of 6,034 one-per-person, subtype-assigned HIV-1 group M complete pol sequences
No full textComplete set of 6,034 one-per-person, subtype-assigned HIV-1 group M complete pol sequences is in a tab-delimited file containing the aligned pol sequence, GenBank accession number, GenBank author list, GenBank submission title, PubMed ID, country, sample year, and assigned subtype/CR
Miquel Martí i Pol, traducció i censura
No full textPoeta, autor de narracions i memòries, Miquel
Martí i Pol també fou un prolífic traductor
del francès, amb petites incursions
en les literatures anglesa, italiana i llatinoamericana.
S’estrenà a la segona meitat dels
anys seixanta, quan la tènue obertura del
Ministeri d’Informació i Turisme aportà aires
de modernitat a la indústria editorial catalana,
que volgué introduir i difondre nous
corrents. En vuit anys, entre 1965 i 1973,
traduí al català, majoritàriament del francès,
vuit obres de la literatura i del pensament
contemporanis. Contextualitzades les
traduccions de Miquel Martí i Pol, l’article
se centra en l’estudi dels expedients de censura
dels vuit títols que traduí al català entre
1965 i 1973, dipositats a l’Archivo General
de la Administración d’Alcalá de Henares.The poet and author of narratives and memoirs,
Miquel Martí i Pol, was also a prolific
translator from the French and very occasionally
of English, Italian and Latin American literary
works. He began this task in the second
half of the 1960s, when the timid relaxing of
the controls of the Ministry of Information and
Tourism brought airs of modernity to Catalan
publishing, which resulted in the introduction
and diffusion of new currents. In the eight
years between 1965 and 1973, Miquel Martí
i Pol translated into Catalan, mainly from the
French, eight works of contemporary thought
and literature. After placing his translations in
context, the article centres on the study of the
censors’ reports on these eight titles. These reports
are deposited in the General Archive of
the Administration in Alcalá de Henares
Identification of freshwater Phycodnaviridae and their potential phytoplankton hosts, using DNA pol sequence fragments and a genetic-distance analysis
No full textViruses that infect phytoplankton are an important component of aquatic ecosystems, yet in lakes they remain largely unstudied. In order to investigate viruses (Phycodnaviridae) infecting eukaryotic phytoplankton in lakes and to estimate the number of potential host species, samples were collected from four lakes at the Experimental Lakes Area in Ontario, Canada, during the ice-free period (mid-May to mid-October) of 2004. From each lake, Phycodnaviridae DNA polymerase (pol) gene fragments were amplified using algal-virus-specific primers and separated by denaturing gradient gel electrophoresis; 20 bands were extracted from the gels and sequenced. Phylogenetic analysis indicated that freshwater environmental phycodnavirus sequences belong to distinct phylogenetic groups. An analysis of the genetic distances "within" and "between" monophyletic groups of phycodnavirus isolates indicated that DNA pol sequences that differed by more than 7% at the inferred amino acid level were from viruses that infect different host species. Application of this threshold to phylogenies of environmental sequences indicated that the DNA pol sequences from these lakes came from viruses that infect at least nine different phytoplankton species. A multivariate statistical analysis suggested that potential freshwater hosts included Mallomonas sp., Monoraphidium sp., and Cyclotella sp. This approach should help to unravel the relationships between viruses in the environment and the phytoplankton hosts they infect.final article publishedphytoplanktonChlorophytadiatomsFresh WaterPhycodnavirida
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