98,026 research outputs found
Contribution IFJ PAN to the construction of the WENDELSTEIN 7-X stellarator (2008-2009)
No full textThe Wendelstein 7-X stellarator is now being assembled at the Max Planck Institute for Plasma Physic (IPP), Greifswald, Germany. The Agreement on Cooperation between the Max-Planck-Institut fur Plasmaphysik in Garching and the Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences in Krakow (IFJ PAN) was signed off in 2007. The intention of the agreement is to cover the whole period of the W7-X construction. According to the agreement IFJ PAN has taken over the following tasks:
1. to assembly of the bus bar system powering the superconducting coils of the stellarator;
2. to take part in design of equipment used during handling, transportation and assembly of outer vessels;
3. to manufacture 30 polichromators used for plasma diagnostics.
Task No 2 was completed in 2008 while tasks No 1 and 3 are to be continued
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
Compressive Sensing for PAN-Sharpening
No full textBased on compressive sensing framework and sparse reconstruction technology, a new pan-sharpening method, named Sparse Fusion of Images (SparseFI, pronounced as sparsify), is proposed in [1]. In this paper, the proposed SparseFI algorithm is validated using UltraCam and WorldView-2 data. Visual and statistic analysis show superior performance of SparseFI compared to the existing conventional pan-sharpening methods in general, i.e. rich in spatial information and less spectral distortion. Moreover, popular quality assessment metrics are employed to explore the dependency on regularization parameters and evaluate the efficiency of various sparse reconstruction toolboxes
Contribution of IFJ PAN to the construction of the WENDELSTEIN 7-X stellarator (continuation 2010-2012)
No full textThe Wendelstein 7-X stellarator is now being assembled at the Max Planck Institute for Plasma Physic (IPP), Greifswald, Germany (branch of MP IPP Garching). The Agreement on Cooperation between the MP IPP and the Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences in Krakow (IFJ PAN) was signed in 2007. Within that agreement IFJ PAN has taken over the following tasks: 1. to assembly of the bus bar system powering the superconducting coils of the stellarator; 2. to take a part in design of equipment for handling, transportation and assembly of outer vessel; 3. to manufacture 30 sets of mechanics for polichromators used in plasma diagnostics; 4. to connect the bus bar systems between modules (at so called Module Separation Planes). The Task No 2 was completed in 2008, tasks No 1 and 3 – in 2011 and the Task No 4 - in 2012. General scope of the tasks 1, 2, 3 and the detail description of work done in 2008 – 2009 were presented in [1], [2], [3]. Work done in 2010 – 2011 was periodically reported in [4], [5]
Stretching-induced orientation to improve mechanical properties of electrospun pan nanocomposites
No full textPartially aligned and oriented polyacrylonitrile(PAN)-based nanofibers were electrospun from PAN and SWNTs/PAN in the solution of dimethylformamide(DMF) to make the carbon nanofibers. The as-spun nanofibers were hot-stretched in an oven to enhance its orientation and crystallinity. Then it were stabilized at 250 square under a stretched stress, and carbonized at 1000 square in N-2 atmosphere by fixing the length of the stabilized nanofiber to convert them into carbon nanofibers. With this hot-stretched process and with the introduction of SWNTs, the mechanical properties will be enhanced correspondingly. The crystallinity of the stretched fibers confirmed by X-ray diffraction has also increased. For PAN nanofibers, the improved fiber alignment and crystallinity resulted in the increased mechanical properties, such as the modulus and tensile strength of the nanofibers. It was concluded that the hot-stretched nanofiber and the SWNTs/PAN nanofibers can be used as a potential precursor to produce high-performance carbon composites
Study on the Influence of Intermittent Water Dispersion Needle on Hydraulic Performance of Sprinklers
No full textAn experimental device was designed to investigate the effects of changes in insertion jet depth and frequency of intermittent water dispersion needle on the hydraulic performance of the sprinkler, respectively. The results show that, under the same working pressure, the sprinkler assembled with intermittent water dispersion needles can improve the throw radius by at least 20% compared to the sprinklers assembled with fixed water dispersion needles. Gradually increasing the depth of insertion results in more water being distributed near the sprinkler, and less water reaching the middle and end of the throw radius. Increasing the frequency of insertion jets initially reduces water near the sprinkler, but then leads to an increase. However, water in the middle of the throw radius keeps decreasing, increasing towards the end of the throw radius. By adjusting the frequency of insertion jets, it’s possible to address problems related to excessive water application rates at the end of the throw radius
Clerocidin selectively modifies the gyrase-DNA gate to induce irreversible and reversible DNA damage
No full textClerocidin (CL), a microbial diterpenoid, reacts with DNA via its epoxide group and stimulates DNA cleavage by type II DNA topoisomerases. The molecular basis of CL action is poorly understood. We establish by genetic means that CL targets DNA gyrase in the gram-positive bacterium Streptococcus pneumoniae, and promotes gyrase-dependent single- and double-stranded DNA cleavage in vitro. CL-stimulated DNA breakage exhibited a strong preference for guanine preceding the scission site (-1 position). Mutagenesis of -1 guanines to A, C or T abrogated CL cleavage at a strong pBR322 site. Surprisingly, for double-strand breaks, scission on one strand consistently involved a modified (piperidine-labile) guanine and was not reversed by heat, salt or EDTA, whereas complementary strand scission occurred at a piperidine-stable -1 nt and was reversed by EDTA. CL did not induce cleavage by a mutant gyrase (GyrA G79A) identified here in CL-resistant pneumococci. Indeed, mutations at G79 and at the neighbouring S81 residue in the GyrA breakage-reunion domain discriminated poisoning by CL from that of antibacterial quinolones. The results suggest a novel mechanism of enzyme inhibition in which the -1 nt at the gyrase-DNA gate exhibit different CL reactivities to produce both irreversible and reversible DNA damage
Gated relational stacked denoising autoencoder with localized author embedding for global citation recommendation
No full textCitation recommendation is an effective and efficient way to facilitate authors finding desired references. This paper presents a novel neural network based model, called gated relational probabilistic stacked denoising autoencoder with localized author (GRSLA) embedding, for global citation recommendation task. Our model is comprised of two modules with different neural network architecture. For each citing and cited papers, we use a gated paper embedding module, which is extended from probabilistic stacked denoising autoencoder (PSDAE) by adding gated units, to obtain their paper vectors. The added gated units are able to utilize text information of cited paper to refine the vector representation of citing paper in multiple semantic levels. For an author in papers, we first apply topic model to obtain his/her semantic neighbors, and then use a localized author embedding (LAE) module to excavate author vector representation from semantic and explicit neighbors. Unlike most graph convolutional network (GCN) based methods, the LAE module is able to avoid computing global Laplacian in whole graph by taking limited neighbors. Moreover, the LAE module can also be stacked to absorb more neighbors, which makes our model have high extendibility. Based on the generation process of GRSLA, we also derive a learning algorithm of our model by maximum a posteriori (MAP) estimation. We conduct experiments on the AAN, DBLP and CORD-19 datasets, and the results show that GRSLA model works well than previous global citation recommendation methods
PAN-00066075 - rowel spur group X
No full textThis find is registered at Portable Antiquities of the Netherlands with number PAN-0006607
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