2,791 research outputs found
The people behind the papers - Yonit Maroudas-Sacks and Marko Popovic
No full textDuring Hydra regeneration, supracellular actomyosin fibres are disoriented at two distinct foci of the regenerating tissue. These sites of nematic topological defects eventually form the new head and foot of the regenerated animal. In a new study, Yonit MaroudasSacks, Marko Popovic, Kinneret Keren and colleagues propose a positive-feedback loop that incorporates fibre organisation, tissue strain and morphogen gradients to promote head organiser formation. To find out more about the work, we caught up with first author Yonit Maroudas-Sacks and co-corresponding author Marko Popovic, Group Leader at the Max Planck Institute for the Physics of Complex Systems, Germany
General Programs for Least pth and Near Minimax Approximation
No full textTitle: General Programs for Least pth and Near Minimax Approximation, Author: Jadranka K. Rizoniko-Popovic, Location: ThodeUser-oriented computer programs in FORTRAN IV for discrete least pth approximation with a single specified function, and more generalized discrete least pth approximation with various specifications, which may also be used for nonlinear programming, are presented. Values of p up to 10^6 can be used successfully in conjunction with efficient gradient minimization algorithms such as the Fletcher-Powell method and a recent method due to Fletcher. It has already been demonstrated how efficiently extremely near minimax results can be achieved on a discrete set of sample points using this approach and the programs written verify this. The programs may be applied to a wide variety of design problems with a wide range of specifications. They are suitable for electrical network and system design and such problems as filter design.ThesisMaster of Engineering (ME
Replication Data for: "Charm Offensive or Offensive Charm? An Analysis of Russian and Chinese Cultural Institutes Abroad" Milos Popovic , Erin K. Jenne , and Juraj Medzihorsky. Europe-Asia Studies. https://doi.org/10.1080/09668136.2020.1785397
No full textThis archive contains the replication files for "Charm Offensive or Offensive Charm? An Analysis of Russian and Chinese Cultural Institutes Abroad" Milos Popovic , Erin K. Jenne , and Juraj Medzihorsky. Europe-Asia Studies. https://doi.org/10.1080/09668136.2020.178539
Cascaded network optimization program
No full textReport and program package produced by John W. Bandler, Jadranka Rizoniko-Popovic, and Virendra K. Jha. Program package is written in FORTRAN IV.This paper presents a user-oriented computer program package that will analyze and optimize certain cascaded linear, time-invariant, electrical networks such as microwave filters and allpass networks. John W. Bandler was a member of the Communications Research Laboratory from 1970 to 1973, leaving to form the Research Group on Simulation, Optimization and Control
Effects of 200 keV Ar-ions irradiation on the structural and optical properties of reactively sputtered CrN films
No full textModification in structural and optical properties of chromium-nitride (CrN) films induced by argon ion irradiation and thermal annealings were investigated using various experimental techniques. CrN films deposited by d.c. reactive sputtering on Si substrate were implanted with 200 keV argon ions, at fluences of 5-20 x 10(15) ions/cm(2). As-implanted samples were then annealed in vacuum, for 2 h at 700 degrees C. Rutherford backscattering spectrometry, X-ray diffraction, cross-sectional (high-resolution) transmission electron microscopy and spectroscopic ellipsometry (SE) measurements were carried out in order to study structural and optical properties of the layers. After irradiation with 200 keV Ar ions a damaged surface layer of nanocrystalline structure was generated, which extended beyond the implantation profile, but left an undamaged bottom zone. Partial loss of columnar structure observed in implanted samples was recovered after annealing at 700 degrees C and CrN started to decompose to Cr2N. This layer geometry determined from transmission electron microscopy was inferred in the analysis of SE data using the combined Drude and Tauc-Lorentz model, and the variation of the optical bandgap was deduced. The results are discussed on the basis of the changes induced in the microstructure. It was found that the optical properties of the layers are strongly dependent on the defects' concentration of CrN. (C) 2016 Elsevier B.V. All rights reserved
Cutaneous lupus erythematosus and immunoreactivity in patients with Ro/SSA autoantibodies
No full textLupus crythematosus (LE) is a heterogenous autoimmune disorder with many different clinical presentations. Cutaneous lupus erythematosus (CLE) is subdivided into acute, subacute and chronic CLE. Population-based epidemiologic studies of CLE are lacking arid the pathogenesis is not fully understood. A major target for the autoimmune response in lupus is the Ro52 antigen, and Ro/SSA autoantibodies are frequently found in sera from patients with lupus. The focus of this thesis has been to estimate the incidence and prevalence of subacute CLE (SCLE) in Stockholm, Sweden, to characterize Ro/SSApositive patients, both clinically and serologically, and to study the skin as a target organ to learn more about the autoimmune inflammatory process.By studying serology-based registers of Ro/SSA autoantibody positive patients and by the use of questionnaires, we could estimate the incidence of Ro/SSA-positive SCLE to 0.7 per 100,000 persons per year and the prevalence to 6.2-14 per 1 00,000 persons. Self reported photosensitivity was found in 54% of the Ro/SSA-positive patients and polymorphous light eruption was found to be more common than in the general population. Smoking was also more common. Serologic analysis using enzyme linked immunosorbent assay revealed higher levels of binding Ro52 and La antigens in CLE patients with systemic manifestations compared to those with the disease confined to the skin, indicating different pathogenetic mechanisms for different clinical presentations. The fine specificity of Ro/SSA could thus serve as a tool to reveal predisposed patients at risk of developing systemic disease. Furthermore, a prospective study of our cohort revealed a dynamic disease process in Ro/SSA-positive patients in a short perspective of two years, with the development of either a new or an additional autoimmune disease as well as drug induced SCLE.Immunohistochemical studies of skin biopsies revealed increased cytoplasmic and extracellular expression of the proinflammatory cytokine high mobility group box chromosomal protein 1 (HMGB1) in both spontaneously occurring as well as in photoprovoked lesions of CLE compared to normal controls. These findings imply that HMGB1 is involved in the inflammatory autoimmune process of CLE and may thus constitute a potential therapeutic target. We were also able to demonstrate TNFα arid IL-1β expression in CLE lesions which together with HMGB1 can result in sustained inflammation in CLE. The Ro52 antigen was studied and found to be overexpressed in systemic LE (SLE) and Sjögren's syndrome patients and to function as an E3 ligase regulating proliferation and apoptosis. Ro52 may thus hypothetically contribute to the autoantigenic load and induction of autoimmune B and T cell responses observed in Ro/SSA-positive CLE patients as well.In conclusion, SCLE is a rare subset of lupus but our data together with prevalence estimations for other subsets, show that CLE is probably a more prevalent disease than SLE. Guidelines of care based on our findings will include councelling concerning smoking cessation, sun-protection and avoidance of photosensitizing drugs. Our findings also demonstrate the importance of awareness of the manifestations Ro/SSA^ positive patients are at risk of developing, and underline the need for regular clinical follow-up for these patients.List of scientific papersI. Popovic K, Nyberg F, Wahren-Herlenius M, Nyberg F. (2006). A serology-based approach combined with clinical examination of 125 Ro/SSA-positive patients to define incidence and prevalence of subacute cutaneous lupus erythematosus. Arthritis Rheum. 56(1): 255-264. https://doi.org/10.1002/art.22286 II. Popovic K, Brauner S, Ek M, Wahren-Herlenius, Nyberg (2006). Fine specificity of the Ro/SSA autoantibody response in relation to serological and clinical findings in 96 patients with self-reported cutaneous symptoms induced by the sun. Lupus [Accepted] https://doi.org/10.1177/0961203306073135 III. Popovic K, Wahren-Herlenius M, Nyberg F (2006). A prospective study of 102 anti-Ro/SSA positive patients: Two-year follow-up with clinical examination and questionnaires. [Submitted]IV. Popovic K, Ek M, Espinosa A, Padyukov L, Harris HE, Wahren-Herlenius M, Nyberg F. (2005). Increased expression of the novel proinflammatory cytokine high mobility group box chromosomal protein 1 in skin lesions of patients with lupus erythematosus. Arthritis Rheum. 52(11): 3639-45. https://doi.org/10.1002/art.21398 V. Barkauskaite V, Ek M, Popovic K, Erlandsson Harris H, Wahren-Herlenius M, Nyberg F. (2006). Extracellular and cytoplasmic translocation of HMGB1 coincides with the peak of clinical activity in exerimentally UV-induced lesions of cutaneous lupus erythematosus. [Submitted]VI. Espinosa A, Zhou W, Ek M, Hedlund M, Brauner S, Popovic K, Horvath L, Wallerskog T, Oukka M, Nyberg F, Kuchroo VK, Wahren-Herlenius M. (2006). The Sjogren's syndrome-associated autoantigen Ro52 is an E3 ligase that regulates proliferation and cell death. J Immunol. 176(10): 6277-85. https://pubmed.ncbi.nlm.nih.gov/16670339 </p
Crest Factors of Complementary-Sequence-Based Multicode MC-CDMA Signals
No full textThe crest factor properties of binary phase-shift keying modulated two- and four-code assisted multicarrier code-division multiple-access (MC-CDMA) employing complementary-sequence-based spreading sequences are characterized. More specifically, a complementary-sequence pair, a complementary- sequence-based subcomplementary code pair, and a Sivaswamy’s complementary code set are studied. It was found that the corresponding crest factors are bounded by 3 dB, which corresponds to the crest factor of a single sine wave. This low crest factor resulted in a lower power loss and a lower out-of-band power spectrum due to clipping when the time-domain signal was subjected to a typical nonlinear power amplifier, in comparison to those ofWalsh code and orthogonal Gold code-spread MC-CDMA signals. Index Terms—Complementary set, crest factor (CF), Golay codes, multicarrier code-division multiple-access (MC-CDMA), Shapiro–Rudin sequence, subcomplementary set
Roman land division in Istria, Croatia : historiography, LiDAR, structural survey and excavations
No full textAbstract: Many interpretations of the ancient cadastre of the Roman colonies of Pola and Parentium on the Istrian pen-insula in Croatia have been offered recently on the basis of satellite imagery and the Croatian topographic map. This grid, spreading continuously over an area of roughly 1200 km2, was identified through numerous structures which correspond to the ancient Roman metric system, but they were never a part of further re-search. This approach enabled identification of structures that were most often visible in the contemporary cadastre, like modern roads or field boundaries, but gaps were left in areas where the modern cadastre did not reflect the ancient one. Until the commission of airborne laser scanning (ALS or LiDAR), from which our research began, one of these gaps was on the northern side of the Lim bay, in the Municipality of Vrsar. Inter-pretation of ALS data resulted in detecting different, multi-temporal spatial organisations of the landscape, among which were numerous, previously unidentified, remains of the Roman limites. The results of this inter-pretation guided the field inspection. Different surface manifestations of individual remains were categorized, and it was defined which are the original Roman structures. The results of this structural survey subsequently guided the archaeological excavations. Only with the combination of these procedures it was possible to un-derstand the original construction of the limites
Stojan Jovanovic - a state cadet and the author of French grammar
No full textStojan Jovanovic, called by the name of Cukic by his contemporaries, is
mainly known as a leader of Katanska buna (The Rebellion of Katanas) in 1844.
The subject of this paper is Jovanovic?s education in Serbia and Vienna. A
thesis statement is that Stojan Jovanovic, Filip Hristic, and Anastas
Jovanovic have enjoyed the favor and support of the Obrenovic family, to whom
they have been loyal in return. Stojan Jovanovic belonged to the first
generation of students who've graduated from all schools existing in Serbia
during Prince Milos?s reign - he has finished the primary school in Belgrade,
the High School, i.e. the Kragujevac Gymnasium in 1836, and has attended the
Military Academy in Pozarevac, Belgrade and Kragujevac between 1837 and 1838.
In 1839. Jovanovic was appointed to the first group of state cadets who were
sent to study in Vienna. This generation of students was in many ways similar
to the one that attended the Belgrade Higher School (1808 - 1813). Jovanovic
stayed in Vienna for three years. For the first two years he has learned
French and German, preparing for the Law school. He has enrolled at the
Vienna University in the winter of 1841, and passed three exams by the end of
the school year. Several times he has asked the Ministry of education in
Belgrade to send him to study in Paris, but he was denied. On the initiative
of the emissary of the Serbian government, Jovan Sterija Popovic, Jovanovic
and other cadets have been withdrawn from the studies in Vienna. Between
1842. and 1844. Jovanovic has taken part in three rebellions against the
regime of Ustavobranitelji (the Defenders of the Constitution). In the summer
of 1844. in Vienna, Jovanovic has printed a manual for learning French,
French Grammar. Although it is a compilation, the manual is significant since
it has brought contemporary methods of learning French language to Serbian
readers. The papers end with a well founded presumption, based on the yet
unknown document, that Stojan Jovanovic has survived the Katanska buna in
1844.</jats:p
La plainte du chien battu, ou la poésie désenchanteresse (1991-2013) de Michel Houellebecq
No full textCe mémoire propose une étude des poésies de Michel Houellebecq menée dans le respect des visées et du cadre théorique de la sociocritique (Duchet, Robin, Popovic). Chacun de ses trois chapitres explore un thème de recherche qui s’est imposé par sa prégnance dans l’œuvre étudiée : la vie urbaine, la vie sociale, les altérités de la ville. L’hypothèse principale est que l’écriture houellebecquienne capte des signes, des actes de langage, des représentations qui circulent dans la société française contemporaine, et qu’elle le fait de manière dynamique, c’est-à-dire en les soumettant à un travail scriptural qui critique leur usage et qui en modifie le sens. La « mise en texte » (Duchet) de la vie urbaine (premier chapitre) met à jour une domination de la ville et de ses habitants par les seules lois économiques. Elle décrit ainsi un monde qui n’est plus que marchand. Celle de la vie sociale et des liens interpersonnels (deuxième chapitre) démontre leur étonnante facticité et atteste que leur organisation restreint de plus en plus les libertés individuelles. Ce qui était un acquis de la modernité sociale : pouvoir bénéficier de « temps libre » pour prendre soin de soi et des proches, devient de plus en plus impossible. Enfin, celle des altérités de la ville (banlieue, province, nature – troisième chapitre), prouve que ces dernières n’offrent aucune alternative à l’hostilité du monde urbain et à la règle du chacun pour soi. Malgré ce diagnostic désolant, la poésie cherche à déceler ici ou là des traces d’espoir et de solidarité.This master’s dissertation is a study of Michel Houellebecq’s poetry according to the theoretical framework of sociocritic (Duchet, Robin, Popovic). Urban life, social life and alterities of the city are the most present themes in the poetical work of the author. The main hypothesis is that the writing mobilizes and take over signs, linguistic acts and representations which float around in the French contemporary society, but in a dynamic way: the scriptural act of writing modifies their meaning and criticizes their common use. In the first chapter, we will discuss the “putting into text” (literal translation of the « mise en texte » concept by Duchet, which is the action of putting something into the form of a literary text) of urban life, which shines a light on how much the economic laws rule the city and its inhabitants. It describes a market world where money reigns. In the second chapter, the “putting into text” of social life and people-to-people ties shows how surprisingly artificial they are and certifies that their organization shrinks individual liberties more and more. Having free time to spend with your loved ones was once a given of social modernity but is now becoming difficult to manage. In the third and last chapter, the putting into text of the othernesses of the city (suburbs, province, nature) reveals that they offer no alternative to the hostility of the urban world and the fact that it is, and it will always be, every man for himself. Despite this distressing diagnosis, poetry tries to detect here and there hints of hope and solidarity
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