92,581 research outputs found
Comparative analysis of NES and TMD performance via high-dimensional invariant manifolds
No full textA comparative study between a tuned mass damper (TMD) and a nonlinear energy sink (NES), attached to a linear two-degree-of-freedom (DoF) mechanical system under impulsive excitation, is performed. The analysis involves different scenarios; namely, we consider the cases in which only one or both modes of the primary system are initially excited. First, exploiting a harmonic balance approach, the invariant manifolds describing the slow dynamics of the system are identified. Then, introducing the so-called relative dissipation power, the performance of the two absorbers is carefully compared, based on analytical computations. Results illustrate that the two absorbers have similar performance, albeit resorting to different mechanical properties: The NES achieve a broad frequency band of operation exploiting nonlinearity, while the TMD by increasing damping. An interesting feature, highlighted by the invariant manifold, is that the NES is generally unable to resonate with more than one mode of the primary system at the same time, rather, it experiences a sort of modal cascade
(書簡)Date: 1964/5/25 ; Sender: Habib, Hassan ; Receiver: Tsuru, S (Shigeto)
No full textPakistan Administrative Staff College用紙書簡オリジナルの所在: 一橋大学経済研究所資料室都留重人氏より寄贈1-B1-08-08/00
First Report of Stagonosporopsis pogostemonis Causing Leaf Spot on Cauliflower in Italy
No full text: First report of Stagonosporopsis pogostemonis causing leaf spot on cauliflower in Italy Wassim Habib1, Mariangela Carlucci2, Roberto Fasano3, Franco Nigro1,2 † 1 Centre of Research, Experimentation and Training in Agriculture (CRSFA) - Basile Caramia, via Cisternino 281, Locorotondo, 70010 Bari, Italy 2 Department of Soil, Plant and Food Sciences, University of Bari - Aldo Moro, via Amendola 165A, 70126 Bari, Italy 3 Bioricerche, Phytopathological Lab, via Pio XI 30, Bellizzi, 84092 Salerno, Italy † Corresponding author: F. Nigro. Email: [email protected] Keywords: Phoma-like, Multi-locus gene sequencing, Brassica oleracea L. var. botrytis, Campania. In September 2022, a severe foliar disease was observed on 2-3-week-old 'Corsaro' and 'Parthenon' seedlings of cauliflower (Brassica oleracea L. var. botrytis) grown under greenhouses in a nursery in Caserta province, Campania (Italy), with an incidence of 90% on about 150,000 plants. Affected plants showed numerous small, irregular, and depressed lesions bordered by a chlorotic halo on leaves that become necrotic, and later drop out giving a shot-hole effect (Fig. 1). Isolations were performed on leaf portions from 30 symptomatic samples which were surface-sterilised by dipping in 70 % ethanol for 30s, then in a sodium hypochlorite solution (1%) for 30s, and rinsed two times in distilled sterilised water. Tissue fragments were left to dry on sterile filter paper and then seeded on potato dextrose agar (PDA) amended with 0.5 g/L of streptomycin sulphate (Sigma-Aldrich S.R.L, Steinheim, Germany). After 6 to 8 days of incubation at 24 ± 1°C, colonies revealed a consistent growth of a Phoma-like fungus resembling Stagonosporopsis genus. On PDA, one-week-old colonies were dark olivaceous green to brown with white regular margin (Fig. 2B). Pycnidia (32-160 μm × 30-95 μm) were subglobose, and conidia (2.7-4.8 μm × 1-2.7 μm) ellipsoidal, with rounded ends, aseptate, with two polar guttules (Fig. 2C). All isolates had similar morphological features, therefore further analyses were performed on one representative strain (CRSFA.753.22). The multilocus phylogenetic approach using Maximum likelihood method and Tamura-Nei model on rDNA-ITS, TUB and RPB2 sequences (accession numbers: OQ318550, OQ326503, OQ326504) including reference strains of Stagonosporopsis (Dong et al. 2021) demonstrated that CRSFA.753.22 clustered with Stagonosporopsis pogostemonis Luo, Huang & Manawas holotype (ZHKUCC 21-0001) with 91% bootstrap support. ITS and RPB2 sequences had 100% BLAST match to ZHKUCC 21-0001, whereas TUB sequence had 99.69%. Pathogenicity tests were performed on 20 healthy 'Corsaro' plantlets. Leaves were surface sterilized with 70% alcohol and wounded with a sterile tip of a needle. A suspension of conidia and mycelial fragments, obtained from a 10-days-old colony of the strain CRSFA.753.22, was sprayed on the leaf surfaces at a distance of 20 cm. Five controls plants were inoculated with sterile distilled water. Plants were then covered with plastic bags and kept on the shelf in a growth chamber at 25° C, with a 12-h photoperiod. The first symptoms developed on leaves five days post-inoculation as irregular small brown spots, that were gradually expanded. Leaf tissues showed chlorosis which evolved into necrosis (Fig. 2A). Stagonosporopsis pogostemonis was consistently re-isolated from all diseased leaves, but not from control plants, thus fulfilling Koch's postulates. In Italy, Stagonosporopsis species have been reported as severe plant pathogens (Garibaldi et al. 2022; Guarnaccia et al. 2022), and this is the first report of the species S. pogostemonis in the country. References Dong, Z.Y., et al. 2021. Pathogens 10:1093. doi: 10.3390/pathogens10091093 Garibaldi, A., et al. 2022. Plant Pathol. J. 104:1157. doi: 10.1007/s42161-022-01138-7 Guarnaccia, V., et al. 2022. Plant Pathol. J. 104:1491. doi: 10.1007/s42161-022-01197-w
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Disjoint sparsity for signal separation and applications to hybrid inverse problems in medical imaging
No full textThe main focus of this work is the reconstruction of the signals f and gi, i=1,...,N, from the knowledge of their sums hi=f+gi, under the assumption that f and the gi's can be sparsely represented with respect to two different dictionaries Af and Ag. This generalizes the well-known “morphological component analysis” to a multi-measurement setting. The main result of the paper states that f and the gi's can be uniquely and stably reconstructed by finding sparse representations of hi for every i with respect to the concatenated dictionary [Af,Ag], provided that enough incoherent measurements gi are available. The incoherence is measured in terms of their mutual disjoint sparsity. This method finds applications in the reconstruction procedures of several hybrid imaging inverse problems, where internal data are measured. These measurements usually consist of the main unknown multiplied by other unknown quantities, and so the disjoint sparsity approach can be directly applied. As an example, we show how to apply the method to the reconstruction in quantitative photoacoustic tomography, also in the case when the Grüneisen parameter, the optical absorption and the diffusion coefficient are all unknown
Kiai Kharismatik dan Hegemoninya (Telaah Fenomena Habib Syech bin Abdul Qadir Assegaf)
No full textAbstract This paper discusses the pattern of kiai hegemony as a charismatic leader. Kiai have a strategic position, are very respectable, and even have a big influence on the development of a community. The author examines the phenomenon of Habib Syech bin Abdul Qadir Assegaf as one of the charismatic kiai. Kiai is not a person who is experienced and has professional skills, but is socially proven to be able to spearhead the process of social change in society. The functionalist perspective presented by William F. Ogburn the author uses as an approach in interpreting the kiai's charismatic leadership. This perspective considers social change as something that can disrupt the balance of society. Kiai not only restricts the flow of culture, but the kiai seeks to spearhead change. The main finding in this paper is that compliance that is formed from a charismatic kiai is able to consciously obey his followers and without coercion. Kiai not only restricts the flow of culture, but the kiai tries to spearhead changes. On the other hand Habib Syech bin Abdul Qadir Assegaf tends to create restrictions on relations to a political party activity. In a functionalist perspective, change is integrated in culture. The culture of sholawatan that has grown very strong among the NU community, is another supporting aspect in the creation of charismatic permanence Habib Syech bin Abdul Qadir Assegaf as a Kiai. Charismatic leadership is raised on the emotional involvement of an individual in identifying the psychological individual of his followers in an effective way, which leads to cultural constancy adopted by certain community groups.Keywords : kiai, leadership, charismatic, hegemonyAbstrak Tulisan ini membahas tentang pola hegemoni kiai sebagai pemimpin kharismatik. Kiai mempunyai kedudukan strategis, sangat terhormat, bahkanberpengaruh besar pada perkembangan suatu komunitas. Penulis melakukan telaah terhadap fenomena Habib Syech bin Abdul Qadir Assegaf sebagai salah seorang kiai kharismatik. Kiaibukanlah sosok yang berpengalaman dan memiliki kemampuan profesional, tetapi secara sosial terbukti mampu memelopori proses perubahan sosial dalam masyarakat. Perspektif fungsionalis yang disampaikan oleh William F. Ogburn penulis gunakan sebagai sebuah pendekatan dalam memaknai kepemimpinan kharismatik kiai.Perspektif ini menganggap perubahan sosial sebagai suatu hal yang dapat mengacaukan keseimbangan masyarakat.Kiai bukan hanya membatasi arus budaya yang masuk, namun kiai berupaya memelopori perubahan Temuan utama didalam tulisan ini adalah kepatuhan yang terbentuk dari kharismatik seorang kiai mampu menghegemoni pengikutnya dengan sadar dan tanpa suatu paksaan. Kiai bukan hanya membatasi arus budaya yang masuk, namun kiai berupaya memelopori perubahan. Disisi lain Habib Syech bin Abdul Qadir Assegafcenderung menciptakan pembatasan hubungan terhadap suatu aktivitas partai politik. Dalam perspektif fungsionalis perubahan terintegrasi dalam kebudayaan.Budaya sholawatan yang sudah tumbuh sangat kuat dikalangan masyarakat NU, menjadi aspek pendukung lain dalam penciptaan kelanggengan kharismatik Habib Syech bin Abdul Qadir Assegafsebagai seorang Kiai. Kepemimpinan kharismatik dimunculkan atas keterlibatan emosional seseorang individu dalam mengidentifikasi psikologis individu pengikutnya dengan cara efektif, yakni mengarah pada keajegan budaya yang dianut oleh kelompok masyarakat tertentu.Kata kunci : kiai, kepemimpinan, kharismatik, hegemon
Numerical investigation of the instability of premixed dump combustors
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.Includes bibliographical references (v. 2, leaves 303-312).by Habib Nasri Najm.Ph.D
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
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