87,083 research outputs found
Interoperability between BIM and FEM for vibration-based model updating of a pedestrian bridge
No full textFinite Element Model (FEM) updating is the procedure of minimizing errors between the experimental measurements and response simulated by FEMs. It can lead to more accurate and representative models useful to perform forecast analysis or detect initial damage thresholds for structures and infrastructure. The paper investigates the potentialities to carry out an automatic model updating through the interoperability between FEMs, Building Information Modeling (BIM), and experimentally vibration-based information. Indeed, these latter possess details and data (geometrical or mechanical) that could be automatically transferred in a numerical environment for structural modeling. The ability of this exchange is assessed by a methodology applied to a pedestrian walkway. The first path utilizes the geometrical data coming from a BIM model of the walkway to achieve three different levels of meshing. Consequently, three accurate finite element modeling have been pursued based on the achieved discretization. For each model, the accuracy and cost analysis has been evaluated considering the minimal distance between the main experimental modal parameters, identified from output-only dynamic tests, and the numerical ones, obtained after manual model updating. Additionally, a second path attempts to realize an automatic model updating through a simplified representative numerical system of the walkway implemented in Matlab. To this end, first, an opportune algorithm has been developed capable of processing the data and information from both BIM and experimental identification. Second, once the numerical model is realized, the potentiality of a modified Particle Swarm Optimization for improving the structural representativeness has been assessed. In particular, the usefulness of this approach could be related to a smart management system of the structures and infrastructure through a corresponding digital twin model
Identification of Natural and Forcing Frequencies through Noisy Measurements Acquired in Operational Conditions on a Hospital Building
Get PDFOperational modal analysis is a robust and practical approach to structural health monitoring which assumes white noise as input. Therefore, the accuracy of this method can be compromised when dealing with colored unknown excitations, in which, for example, harmonic loads induced by the operation of mechanical equipment, may affect the modal parameter estimation. This study aims to address the challenge of identifying both natural and forcing frequencies of a complex building by exploiting the potentiality of both the spectral kurtosis analysis and stochastic subspace identification technique. The first one is based on the evaluation of a statistical quantity characterized by low values when data are stationary and Gaussian and high values when specific frequencies and nonstationarity are present in the signals. It allows the detection of harmonics, transients, and repetitive impulses in the frequency domain. Its combined use with the stochastic subspace identification technique enables us to effectively identify and separate harmonic-induced vibrations from structural response to ambient white noise. This approach can lead to a more accurate modal parameter estimation that has been investigated in this work through numerical and experimental analyses carried out on the Cardinal Massaia hospital building in Asti, Italy. An experimental daily dynamic campaign has been carried out to acquire accelerations in operational conditions including disturbances due to machinery like elevators and air conditioners. The combined use of kurtosis analysis and stochastic subspace identification techniques has been used to process a large dataset of noisy measurements acquired in operational conditions. Five different measurement setups have been implemented, each one composed of 14 sensors. Notwithstanding the complexity of the case study under investigation for both the structural configuration and difficulties in the experimental data acquisition, this approach allowed to distinguish natural from forcing frequencies, highlighting its accuracy and robustness
Implementation of Epidemic Restrictions to Disrupt the COVID-19 Pandemic in Iran: A Mini-Review
Get PDFThe number of cases infected with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), which causes COVID-19, has been steadily rising globally. Iran, one of the countries with a relatively high number of positive cases, has an inevitable role to play in controlling the pandemic by implementing effective policies and countermeasures to interrupt the viral transmission chain. Epidemic restrictions implemented following an Iranian presidential mandate were especially effective following the Nowruz holidays—the solar New Year celebration in the Persian-speaking culture. These restrictions started flattening the incidence curve of the epidemic in Iran two weeks after implementation, from 10 April 2020. Supplying sufficient face masks, disinfectants, sanitizers, and medical equipment to all government-run and non-for-profit hospitals were included in the presidential mandate. We believe that continuing this policy strictly will be required for further controlling the pandemic throughout the country.
*Corresponding Author: Amin Talebi Bezmin Abadi; Email: [email protected]
Please cite this article as: Talebi Bezmin Abadi A, Rahimi F. Implementation of Epidemic Restrictions to Disrupt the COVID-19 Pandemic in Iran: A Mini-Review. Arch Med Lab Sci. 2020;6:e11. https://doi.org/10.22037/amls.v6.3296
Measured hospital building vibrations induced by air conditioning systems and elevators
Get PDFA recent large campaign of vibration measurements has been conducted on a hospital building in Italy to perform an operational modal analysis of the structure utilized for model updating. Subsequently, the updated model has been used to carry out a vulnerability analysis of the hospital structural system. The building is composed of 41 structural subsystems separated by technical joints. At the same time, several subsystems are differently interconnected, especially through a roof sustained by large-span wooden beams. Long acceleration time histories have been measured by wireless sensors located at the top level of the building in two days of testing. During the tests conducted in operational conditions, in different locations of the building air conditioning systems and elevators were functioning and they were affecting the measures in the high-frequency content. This work aims to investigate the structural identification of the complex structure, the effectiveness of technical joints, and the influence of the wooden roof connection on the dynamic structural behavior. In pursuing these goals, the main challenge is considering the influence of air conditioning and elevator systems on the natural frequency identification of the structure. Therefore, based on the location of the sensors, the similarities in the geometry, and the vicinity of the sensors to the mechanical equipment, all the sensors have been classified into different groups to observe the dynamic response. Furthermore, an Artificial Neural Network (ANN), trained on numerical model results, is applied to experimental data to establish a relation between increasing prediction error and the influence of the air conditioning system and elevator frequencies
Premicrodispus spinosus Hosseininaveh & Hajiqanbar & Talebi 2014, sp. nov.
No full textPremicrodispus spinosus Hosseininaveh & Hajiqanbar sp. nov. (Figures 6–10) Description Female. Length of idiosoma 152 (152–156), width 80 (74–88). Gnathosoma (Figure 8A,B). Gnathosomal capsule about twice as long as its width, dorsally with one pair of cheliceral setae ch 3 (3–3); ventrally with one pair of subcapitular seta su 5 (4–5); palps short, terminated to small tibial claw, and compressed to gnathosomal capsule, with two pairs of setae, dFe 3 (3–4) and dGe 4 (3–4), cheliceral stylets indiscernible; pharyngeal system (Figure 8C) with three pumps, pump 1 reduced, pump 2 the largest and striated, pump 3 small and rounded. Idiosomal dorsum (Figure 6). Stigmata oval-shaped and situated in anterior part of prodorsal shield; all dorsal setae smooth and pointed except setae d, f and h 1, which are blunt-ended; prodorsal shield with one pair of capitate trichobothria and one pair of setae sc 2 19 (18–19); all tergites smooth, tergite C with two pairs of setae c 1 11 (11–13) and c 2 15 (13–15), setae c 2 longer than c 1, posterior border of tergite C with distinct median depression; tergite D with seta d 9 (9–10) and one pair of rhombic cupuli ia, posterior border of tergite D with distinct median depression; tergite EF with two pairs of setae e 10 (10–11) related to one thin apodeme and f 10 (10–11); tergite H with two pairs of setae h 1 10 (10–11), h 2 11(11–12) and one pair of rhombic cupuli ih. Distances between dorsal idiosomal setae: sc 2 – sc 2 26 (25–26), c 1 – c 1 25 (25–26), c 2 – c 2 57 (50–60), c 1 – c 2 17 (17–20), d–d 24 (24–26), e–e 41 (41–44), e–f 5 (5–6), f–f 31 (31–35), h 1 – h 1 12 (11–13), h 1 – h 2 12 (11–12), h 2 – h 2 36 (36–39). Idiosomal venter (Figure 7). Ventral plates smooth; all ventral setae smooth and pointed; apodemes 1 and 2 reaching to appr, appr not reaching to apsej, apodemes 3 extending beyond bases of setae 3 a, apodemes 4 short and not reaching to bases of setae 3 b, apodemes 5 short; anterior border of poststernal plate convex and posterior border of poststernal plate tripartite; coxal field I with two pairs of setae 1 a 10 (9–10) and 1 b 10 (10–11); coxal field II with two pairs of setae 2 a 11 (11–12) and 2 b 14 (13– 15), 2 b longer than 2 a; coxal field III with three pairs of setae 3 a 10 (9–10), 3 b 7 (7–8) and 3 c 7 (7–10), 3 b and 3 c subequal and shorter than 3 a; coxal field IV with two pair of setae 4 b 8 (8–9) and 4 c 7 (7–8); pseudanal segment PS with three pairs of setae ps 1 11 (10–11), ps 2 6 (5–6) and ps 3 18 (16–18), ps 3 distinctly longer than ps 1 and ps 2. Legs. Leg chaetotaxy as in previous species. Leg I (Figure 9A). Tibiotarsus with solenidia ω 1 5 (4–5), ω 2 1 (1–2), φ 1 2 (1–2), and φ 2 4 (3–4), all finger shaped, ω 1 and φ 1 striated, with five eupathidial setae (p ″ , ft ′ , ft ″ , tc ′ , tc ″ ), setae tc ′ longest on leg I, setae pl ″ and pl ′ subequal, setae pv ′ longer than pv ″ , setae v ″ longer than v ′ , setae l ′ and l ″ subequal; genu with setae l ″ , l ′ , v ′ and v ″ , all subequal; femur with setae d and v ″ subequal and both longer than l ′ ; trochanter with seta v ′ . Leg II (Figure 9B). Tarsus with solenidion ω 3 (2–3) finger shaped, pl ″ modified and spine-like, the rest of setae of the segment subequal; tibia with a small finger-shaped solenidion φ 2 (1–2), setae l ′ modified and spine-like, setae d longer than v ′ and v ″ ; genu with setae, l ″ and v ′ subequal and longer than l ′ ; femur with setae d longer than l ′ and v ″ ; trochanter with seta v ′ . Leg III (Figure 10A). Tarsus with modified and spine-like setae pl ″ and tc ′ , setae tc ″ longest setae on the leg, setae pv ″ and pv ′ subequal and shorter than u ′ ; tibia with a small solenidion φ 2 (1–2) and setae d modified and spine-like, seta v ″ and v ′ subequal and longer than l ′ ; genu with setae l ′ and v ′ subequal; femur divided into basifemur and telofemur, setae d and l ′ inserted on telofemur, setae d longer than l ′ ; trochanter with seta v ′ . Leg IV (Figure 10B). Tarsus with subequal setae pl ″ , pv ′ and pv ″ , setae u ′ and tc ″ subequal, seta tc ′ longest on the segment; tibia with small solenidion φ 1 (1–1), seta d and v ′ subequal and longer than l ′ and v ″ ; genu with seta v ′ as long as femoral seta v ′ ; femur divided into basifemur and telofemur, setae d and v ′ inserted on telofemur, seta d longer than v ′ ; trochanter with seta v ′ . Male and larva unknown. Differential diagnosis The new species is readily distinguished from other species of the genus by some spine-like setae on tarsi and tibiae II and III. Other species of the genus Premicrodispus have unmodified setae on these segments. Disregarding this character, the new species is similar to Premicrodispus tenuisetus Khaustov, 2006 but differs from it by setae d blunt and not extending to posterior border of tergite D (seta d pointed and extending to posterior border of tergite D in P. tenuisetus) and setae f and h 1 blunt (setae f and h 1 pointed in P. tenuisetus). Type material Five females found in a vial containing the beetle Corticeus unicolor (Col: Tenebrionidae) in 75% ethanol. The host beetle was collected from oak trees in Naharkhoran forest, Golestan province, northern Iran, 36.46° N, 54.27° E, and altitude 450 m., coll. V. Rahiminejad, 30 July 2010. Etymology The species epithet refers to some spine-like setae on tarsi and tibiae II and III. Key to subgenera and Palaearctic species of the genus Premicrodispus (females) (modified from Khaustov 2006) 1. Genu I with four setae, genu II with three setae............................................... 2 - Genu I with three setae, genu II with one seta.................................................................... subgenus Premicrodispulus, P. reductus Khaustov and Chydyrov, 2010 2. Coxal fields I with two pairs of setae, pharyngeal pump 2 much longer than pharyngeal pump 3..................................................... subgenus Premicrodispus 3 - Coxal fields I with one pair of setae, pharyngeal pump 2 distinctly shorter than pharyngeal pump 3.............................................................................................................. subgenus Premicrodispoides, P. punctatus Khaustov and Maslov, 2013 3. Setae 4 a present................................................................................................. 4 - Setae 4 a absent.................................................................................................. 8 4. Setae ps 2 present....................................................... P. stenops (Mahunka, 1969) - Setae ps 2 absent................................................................................................. 5 5. Bases of setae f associated with well-developed apodeme..................................... ................................................................................. P. lineatus (Mahunka, 1986) - Apodemes associated with bases of setae f absent............................................. 6 6. Setae ps 1 distinctly longer than ps 3............................................................................................................... P. dzumaevi (Sevastianov and Chydyrov, 1991) - Setae ps 1 and ps 3 subequal in length.................................................................. 7 7. Setae d distinctly longer than distance between their bases, bases of setae e without apodemes.............................................................. P. paramaevi sp. nov. - Setae d distinctly shorter than distance between their bases, bases of setae e with apodemes................................................................ P. parasilvestris (Rack, 1974) 8. Setae ps 2 present................................................................................................ 9 - Setae ps 2 absent............................................................................................... 12 9. Setae h 2 distinctly shorter than h 1............................................................................................................... P. akermanae (Sevastianov and Zahida Al Douri, 1988) - Setae h 2 subequal or longer than h 1................................................................. 10 10. Setae h 1 much shorter than h 2, pseudanal setae distinctly shorter than setae of posterior sternal plate.................................................................................................................... P. subvarsoviensis (Mahunka and Zyromska-Rudska, 1975) - Setae h 1 and h 2 subequal, pseudanal setae and setae of posterior sternal plate subequal........................................................................................................... 11 11. Setae h 1, d and f blunt-ended, tarsi and tibiae II and III with spine-like setae..................................................................................................... P. spinosus sp. nov. - Setae h 1, d and f pointed, tarsus and tibia III with setiform setae …................................................................................................... P. tenuisetus Khaustov, 2006 12. Setae sc 2 and d subequal.................................................................................. 13 - Setae sc 2 distinctly longer than d..................................................................... 16 13. Tergites C and D with distinct emarginations in central part............................................................................................ P. incisus Khaustov and Chydyrov, 2010 - Tergites C and D without distinct emarginations in central part.................... 14 14. Setae ps 1 and ps 3 subequal in length................................................................ 15 - Setae ps 3 distinctly longer than ps 1....................................................................................................................... P. heterocaudatus Khaustov and Chydyrov, 2010 15. Setae f short and distinctly not reaching to posterior margin of the body........................................................................................... P. acutisetus Khaustov, 2009 - Setae f long and protruding the posterior margin of the body........................................................................................................ P. longisetosus (Mahunka, 1970) 16. Setae ps 3 distinctly longer than ps 1.................................................................. 17 - Setae ps 1 and ps 3 subequal in length................................................................ 18 17. Tarsus III with well-developed solenidion................................................................................................................... P. paradoxus Khaustov and Chydyrov, 2010 - Tarsus III without well-developed solenidion...... P. longicaudus Khaustov, 2006 18. Anterior margin of posterior sternal plate distinctly convex............................ 19 - Anterior margin of posterior sternal plate straight................................................................................................................... P. kaliszewskii Khaustov, 2006 19. Bases of setae e associated with well-developed apodemes.............................. 20 - Apodemes associated with bases of setae e absent or vestigial........................ 21 20. Setae sc 2 and c 1 subequal, setae c 2 and c 1 situated almost at the same level............................................................................................. P. rackae Khaustov, 2006 - Setae sc 2 distinctly longer than c 1, setae c 2 situated distinctly anterior to c 1........................................................................................ P. brevisetus Khaustov, 2006 21. Setae e shorter than setae f.............................................................................. 22 - Setae e longer than setae f.......................................... P. krczali Khaustov, 2006 22. Setae c 1 and e blunt ended.......... P. obtusisetosus Khaustov and Chydyrov, 2010 - Setae c 1 and e pointed..................................................................................... 23 23. All dorsal setae long and barbed....................... P. karadagensis Khaustov, 2009 - Dorsal setae short and usually smooth.................... P. montanus Khaustov, 2006Published as part of Hosseininaveh, Farahnaz, Hajiqanbar, Hamidreza & Talebi, Ali Asghar, 2014, Two new species of the genus Premicrodispus (Acari: Microdispidae) associated with beetles (Coleoptera: Lucanidae: Tenebrionidae), with a key to Palaearctic species of the genus, pp. 915-931 in Journal of Natural History 49 (15) on pages 922-930, DOI: 10.1080/00222933.2014.953225, http://zenodo.org/record/400469
Variations on the Author
Get PDF“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
Choeras qazviniensis Abdoli & Talebi & Farahani & Fernandez-Triana 2019, sp. nov.
No full text<i>Choeras qazviniensis</i> Fernandez-Triana & Talebi sp. nov. <p>(Figs 5a–h)</p> <p>urn:lsid:zoobank.org:act: 868F3B37-F4EF-4D4E-B86E-90F26A87884E</p> <p> <b>Diagnosis:</b> Pterostigma with a small light spot basally; vein r-m well developed, areolet closed; length/width T1: 1.40, slightly arched (barrel-shaped), with two yellow bands on lateral sides, T1 anterior two third with weak sculptures to smooth; T3+ yellow, medially with a brown band; ovipositor sheaths almost as long as metatibia.</p> <p> <b>Description.</b> Body length without ovipositor: 4.00 mm.</p> <p>Head: Antenna shorter than body; F 2/8/15 length/width: 2.50/2.40/1.25; mouthparts not elongated; gena, vertex and lower face densely and rather finely punctate; upper face smooth and setose; lower face with a weak median longitudinal carina on upper half, clypeus punctured; labrum flat and smooth; malar space length 0.32× basal width of mandible (Figs 5a,b); OOL/OD/POL length: 0.16/0.08/ 0.13 mm (Fig. 5c).</p> <p>Mesosoma: Anteromesoscutum length 0.80× its maximum width, densely punctate, posterior area with weak punctures to smooth; notauli not defined; scutoscutellar sulcus with visible crenulation; mesoscutellar disc smooth and shiny; side of mesoscutellar disc with wider crenulate depression; anterior area of metanotum smooth and with coarse wrinkles posteriorly; propodeum smooth with a rugose median band, and a complete median longitudinal carina (Fig. 5e); side of pronotum smooth; propleuron smooth or weakly punctate; prepectal carina absent; mesopleuron medially smooth, at anterolateral and ventrolateral punctate; metapleuron smooth, anterodorsal corner rugulose, with deep medial pit at anterior half (Fig. 5d).</p> <p>Wings: Fore wing. length: 4.00 mm; pterostigma length/width: 2.10; pterostigma distinctly shorter than vein R1; vein R1 5.50× as long as distance of vein R1 to vein 3RSb; vein r slightly shorter vein 2RS; vein 1M/m-cu length: 2.90; vein 3RSa distinct; areolet closed; vein 1-CUb almost as long as vein 1-CUa. Hind wing. vein M+CU/ 1-M length: 1.10; vein cu-a weak curved; vanal lobe with fringe anteriorly and slightly posteriorly, posterior margin partly straight (Figs 5f,g).</p> <p>Legs: Metacoxa laterally smooth; metafemur/metatibia/metabasitarsus/sum of other segments metatarsus length: 1.03/1.23/0.61/ 0.80 mm, respectively; metafemur length/width: 3.10; metatibial spurs length unequal; internal metatibial spurs/metabasitarsus length: 0.50 (Fig. 5d).</p> <p>Metasoma: T1 slightly curved, T1 length 1.40× its maximum width, barrel-shaped (i.e. anterior and posterior margins narrowed); anterior two third of T1 with weak sculptures to smooth, posterior one third rugose; T1 posterior width 2.50× T2 length medially; T2 transverse and rugose, medially slightly smooth; T3/T2 length: 2.80; T3+ smooth (Fig. 5h); ovipositor sheath curved downwards, rather widened posteriorly; ovipositor sheath length 1.20 mm, approximate as long as metatibia; hypopygium membranous and apically acute (Fig. 5d).</p> <p>Colouration: Body black; labrum, mandibles, palpi, scape and tegulae yellow; clypeus brown; legs almost yellow; metacoxa reddish yellow with a basal dark spot; metatibia posteriorly with a dark spot; distal half of metatibial segments brown (Fig. 5d); wings with brownish yellow setae; wings venation brown and yellow; pterostigma brown with a small light spot basally (Figs 5f,g); T1 with two yellow lateral bands; T3+ yellow, medially with a brown band (Fig. 5h).</p> <p> <b>Etymology:</b> The new species is named after the type locality. The species name " <i>qazviniensis "</i> is an adjective derived from the Qazvin province in the north of Iran.</p> <p> <b>Notes:</b> This species runs in the key by van Achterberg (2002) and Kotenko (2007) to <i>C. tiro</i> (Reinhard, 1880), it differs from <i>Choeras qazviniensis</i> <b>sp. nov.</b> as follows: in <i>C. tiro</i> pterostigma with a yellow spot on basal one third; T3/T2 length: 1.50–2.00; one third of metafemur black or with combination of black and yellow pattern. This species runs in the key by Song <i>et al.</i> (2014) to couplet 8. Two branches of the couplet 8 differ from <i>Choeras qazviniensis</i> <b>sp. nov.</b> as follows: in <i>C. longitergitus</i> Song & Chen, 2014 (first branch of couplet 8) T1 sharply narrowed apically; T1 and T2 largely smooth, only small areas rugose; T2 subtriangular. In the second branch of couplet 8 propodeum strongly rugose; T1 distinctly rectangular and parallel-sided.</p>Published as part of <i>Abdoli, Parisa, Talebi, Ali Asghar, Farahani, Samira & Fernandez-Triana, Jose, 2019, Three new species of the genus Choeras Mason, 1981 (Hymenoptera: Braconidae, Microgastrinae) from Iran, pp. 77-92 in Zootaxa 4545 (1)</i> on pages 85-86, DOI: 10.11646/zootaxa.4545.1.4, <a href="http://zenodo.org/record/2618679">http://zenodo.org/record/2618679</a>
[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.
Figs 1–8. Belyta abrupta Thomson, 1858 in New data on the genus Belyta Jurine, 1807 (Hymenoptera: Diapriidae, Belytinae) from Iran
No full textFigs 1–8. Belyta abrupta Thomson, 1858: female (1–6) and male (7, 8). 1 – generalPublished as part of Izadizadeh, M., Talebi, A.A., Chemyreva, V.G., Farahani, S., Kazerani, F. & Ameri, A., 2023, New data on the genus Belyta Jurine, 1807 (Hymenoptera: Diapriidae, Belytinae) from Iran, pp. 1-18 in Far Eastern Entomologist 471 on page 4, DOI: 10.25221/fee.471.1, http://zenodo.org/record/761636
Figs 35–40. Belyta sanguinolenta Nees, 1834, male. 35 in New data on the genus Belyta Jurine, 1807 (Hymenoptera: Diapriidae, Belytinae) from Iran
No full textFigs 35–40. Belyta sanguinolenta Nees, 1834, male. 35 – general habitus; 36 – head inPublished as part of Izadizadeh, M., Talebi, A.A., Chemyreva, V.G., Farahani, S., Kazerani, F. & Ameri, A., 2023, New data on the genus Belyta Jurine, 1807 (Hymenoptera: Diapriidae, Belytinae) from Iran, pp. 1-18 in Far Eastern Entomologist 471 on page 13, DOI: 10.25221/fee.471.1, http://zenodo.org/record/761636
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