12,502 research outputs found
A variational approach for an inverse dynamical problem for composite beams
No full textThis paper deals with a problem of nondestructive testing for a
composite system formed by the connection of a steel beam and a
reinforced concrete beam. The small vibrations of the composite
beam are described by a differential system where a coupling takes
place between longitudinal and bending motions. The motion is
governed in space by two second order and two fourth order
differential operators, which are coupled in the lower order terms
by the shearing, , and axial, , stiffness coefficients of
the connection. The coefficients and define the
mechanical model of the connection between the steel beam and the
concrete beam and contain direct information on the integrity of
the system. In this paper we study the inverse problem of
determining and by mixed data. The inverse problem is
transformed to a variational problem for a cost function which
includes boundary measurements of Neumann data and also some
interior measurements. By computing the Gateaux derivatives of the
functional, an algorithm based on the projected gradient method is
proposed for identifying the unknown coefficients. The results of
some numerical simulations on real steel-concrete beams are
presented and discussed
Letter from Harry G. Atkinson, Chief, Intelligence Branch, Security and Intelligence Division, to George Hideo Nakamura, October 16, 1945
No full textCorrespondence from Harry Atkinson to George Hideo Nakamura regarding withdrawal of limitations imposed by Nakamura's removal.The Japanese American Archival Collection documents the people, places, and daily life of Japanese Americans, primarily those who lived in the once thriving community of pre-war Florin in the Sacramento region, as well as the conditions in American incarceration camps during World War II. The approximately 7,000 original items include personal and official letters, photographs, diaries, arts and crafts, newsletters, textiles, camps artifacts, yearbooks and other publications
Eosentomon impar Nakamura 2010, sp. nov.
No full textEosentomon impar Nakamura sp. nov. Fig. 27; Table 11 Type specimens. Holotype female (NSMT –Ap 481), Kenmarubi, Mt. Fuji, Fujiyoshida–shi, Yamanashi Prefecture, 35º27'06"N, 138º45'12"E, 1060 m elevation, litter of a forest dominated by P. densiflora, 22-IX-2001, R. Itoh leg. Paratypes: 3 females (NSMT –Ap 482–484), same data as for the holotype; 1 female (NSMT –Ap 485), Mt. Komaga–take, Kanegasaki–cho, Iwate Prefecture, 39º11'21"N, 140º55'41"E, 920 m elevation, litter of a forest dominated by F. crenata, 18-VIII-2001, H. Tamura et al. leg.; 1 female (NSMT –Ap 486), Otaki, Chichibu–shi, Saitama Prefecture, 35º56'58"N, 138º53'57"E, 900 m elevation, 1-V-1991, Y. Kuwabara leg.; 2 females (NSMT – Ap 487–488), Busseki, Nakatsugawa, Chichibu–shi, Saitama Prefecture, 35º59'44"N, 138º49'30"E, 670 m elevation, litter of a forest dominated by F. crenata and Q. crispula, 26- IV- 1988, K. Machida leg.; 2 females (NSMT –Ap 489–490), Omaru–yama, Kamikuisshiki–mura, Yamanashi Prefecture, 35º26'32"N, 138º38'26"E, 1130 m elevation, litter of a forest dominated by F. crenata and Q. crispula, 18- IV- 2001, R. Itoh leg. Other specimens examined. One female, Mt. Iwate –san, Takizawa –mura, Iwate Prefecture, 39º50'29"N, 141º01'22"E, 1080 m elevation, litter of a forest dominated by Q. crispula, 28-VI-1985, O. Nakamura leg.; 1 female, Bato –machi, Tochigi Prefecture, 36º45'57"N, 140º08'52"E, 150 m elevation, litter of a forest dominated by Quercus serrata, 8-VII-2002, Y. Hagiwara leg. Description. Body length 605 µm (605–852 µm). Head 104 (96–107) µm long, 80 (68–84) µm wide. Setae and sensilla on head similar to the preceding species (Figs. 27A, C, F); seta sp 1.3 (1.2–1.7) times longer than p; seta rs inflated, as long as sr (Fig. 27B). On galea (Fig. 27D) digit O longer than M and I, M and I close to each other. Mandible with 3 teeth (Fig. 27E). Clypeal apodemes distinct (Figs. 27A, B). Pseudoculus circular (Fig. 27F), 11 (9–11) µm long, PR = 9 (9–11). Foretarsus length (Figs. 27G–I) 69 (59–71) µm; claw 15 (14–16) µm, TR = 4.9 (4.4–5.1); empodium as long as claw, 15 (13–16) µm, EU = 1.0; sensillum s slightly longer than claw, 16 (16–17) µm. Sensillum t1 closer to α 3 than to α 3 ', BS = 0.9 (0.8–0.9); t2 thinly spatulate; t3 broadened, reaching base of α 7; a not reaching base of γ 2; b spatulate; c reaching nearly to base of γ 3; d broadened, surpassing base of α 6; e and g roundedly spatulate and long; f1 thinly spatulate; f2 reaching base of γ 5; a' at same level with α 3; b'1 nearer to δ 3' than to δ 4', slightly broadened and almost reaching base of δ 4'; b'2 thin; c' absent. Length of middle tarsus 36 (29–38) µm, length of claw 11 (9– 11) µm; hind tarsus 45 (36–45) µm, claw 11 (10–13) µm; both empodia short (Figs. 27J, K), 3 (1–2) µm long; on hind tarsus (Fig. 27K) D2 and D4 spine-like, but more slender than D5. Tracheal camerae distally contracted (Fig. 27L). Central lobe trapezoidal and inner line constricted in middle (Fig. 27M). Laterostigmata II–IV large, with no inner structure; those on V–VII small. On female squama genitalis (Fig. 27N) S-shaped sclerotization on processus sternalis, caput processus of duck’s head-type, filum processus long. Male unknown. Chaetotaxy as in Table 11. On thoracic tergites II–III, P1a seta-like, posterior to P1–P2; P2a seta-like, nearer to P2 than to P3. P1a on abdominal tergite I, P1a and P2a on II–VI and P2a on VII filiform and longer than P1; P1a on VII sensillum-like and about one-third length of P1, posterior to P1–P2; on tergite VIII P1a' oblong and anterior to P2 (Fig. 27O); P1a' and P2 nearly the same level with M4; P2a linear. Setae 1 and 2 on abdominal tergite XI microchaetae. A pair of ventral anterior setae on telson small and sensillum-like. Diagnosis. The present species is similar to E. brevicorpusculum Yin and E. dissimilis Yin from China (Yin 1965, 1979, 1999) in many respects, but this new species is different in the absence of foretarsal sensillum c' (present in the latter two). Moreover the present species is different from E. brevicorpusculum in having four pairs of anterior setae on abdominal tergites V–VI (five pairs in E. brevicorpusculum), and from E. dissimilis in three pairs of anterior setae on the abdominal tergite VII (four pairs in E. dissimilis) and the length of foretarsal sensillum b'1 reaching nearly to base of δ 4' (not reaching base of δ 4 in E. dissimilis). The present species is also similar to E. udagawai, E. taiwanense Nakamura, 1997 from Taiwan (Nakamura, 1997) and E. pusillum Ewing from Michigan, Florida and Carolina, USA (Ewing, 1940; Bernard, 1990), but it is easily distinguished by the long empodium on the hind tarsus (short in this new species). Chaetotaxic variations observed consisted of the asymmetric absences of P1 on the abdominal tergite III in one female and A3 on the abdominal sternite III in another female from Mt. Fuji. Etymology. The specific name is the Latin word for “unequal” and referes to the long inclusion of this species in E. udagawai and its allies. Distribution. Japan (Honshu).Published as part of Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, pp. 1-109 in Zootaxa 2701 on pages 49-5
Eosentomon inconditum Nakamura 2010, sp. nov.
No full textEosentomon inconditum Nakamura sp. nov. Figs. 30–31; Table 13 Type specimens. Holotype female (NSMT –Ap 493), Mt. Akanagi –san, Tokorono, Nikko –shi, Tochigi Prefecture, 36º48'33"N, 139º34'07"E, 1670 m elevation, Sasa field, 21-IX-1996, K. Furuno et al. leg. Paratypes: 2 males (NSMT –Ap 494–495), 1 female (NSMT –Ap 496), same data as for the holotype. Other specimens examined. One female, Ohashi, Minami –ku, Fukuoka –shi, Fukuoka Prefecture, 33º33'27"N, 130º25'56"E, 20 m elevation, grass land, 4-X-2003, T. Kubota leg.; 3 females, Mt. Omoto –dake, Ishigaki Island, Okinawa Prefecture, 24º25'05"N, 124º11'13"E, 170 m elevation, litter of a evergreen broad-leaved forest, 7-III-2002, S. Nagashima leg.; 1 female, Mt. Kubura –dake, Yonaguni Island, Okinawa Prefecture, 24º27'13"N, 122º57'30"E, 150 m elevation, litter of a forest dominated by L. chinensis var. subglobosa, 19-V-2000, H. Mizushima leg. Description. Body length 611 (624–670) µm. Head 100 (104–110) µm long, 71 (74) µm wide. Setae and sensilla on head similar to the preceding species (Figs. 30A–C); seta sp 1.4 times longer than p. On galea (Fig. 30D) digits small, O longer than M and I, M and I close to each other. Mandible with 3 teeth (Fig. 30E). Clypeal apodemes distinct (Figs. 30A, B). Pseudoculus circular with a central depression (Fig. 30F), 11 (12–13) µm long, PR = 10 (9). Foretarsus length (Figs. 30G, H) 68 (70) µm; claw 15 µm, TR = 4.8 (4.9–5.0); empodium equal to claw in length, 14 (14) µm, EU = 1.0; sensillum s slightly longer than claw, 16 (16) µm. Sensillum t1 closer to α 3 than to α 3', BS = 0.9 (0.9); t2 thinly spatulate; t3 slightly thick, reaching base of γ 5; a slightly nearer to γ 1 than to γ 2; b reaching base of β 6; c slightly broadened; d broadened, reaching base of α 6; e and g roundedly spatulate and long; f1 thinly spatulate; f2 short; a' at same level with α 3; b'1 nearer to δ 3' than to δ 4'; b'2 slightly broadened; c' absent. Length of middle tarsus 26 (34–37) µm, length of claw 9 (10–11) µm, empodium shorter than 1/5 of claw length (Fig. 30I), 1 (1–2) µm long; hind tarsus 41 (42–45) µm, claw 11 (10–12) µm, empodium long and about 2/3 of claw length (Fig. 30J), 7 (7–8) µm; on hind tarsus (Fig. 30J) D2 and D4 similar, spine-like, but slender than D5. Tracheal camerae contracted distally (Fig. 30K). Central lobe trapezoidal (Fig. 30L). Laterostigmata II–III distinct, without inner structure. On female squama genitalis (Fig. 30M) S-shaped sclerotization on processus sternalis, caput processus of duck’s head-type; filum processus long; median and proximo-lateral sclerotization distinct. Male genitalis with short basiperiphallar setae. Chaetotaxy as in Table 13. Chaetotaxy of thorax and abdomen similar to E. dubium, but abdominal tergites V– VI with four pairs of anterior setae, A1, A2, A4 and A5 (Fig. 31A), and on abdominal tergite VIII P1a’ and P2 posterior to M4 (Fig. 31E). Diagnosis. This new species resembles E. dubium in many respects, but is differs from it by having four pairs of anterior setae on abdominal tergites V–VI (five pairs in E. dubium), the linear shape of foretarsal sensilla a and b (in E. dubium, a broadened, b spatulate). Moreover, the present species (head length 100–110 µm and foretarsus length 68–70 µm) is larger than E. dubium (head length 85–89 µm and foretarsus length 57–58 µm). Etymology. The specific name is derived from the long confusion of this species with E. udagawai. Distribution. Japan (Honshu, Kyushu and Okinawa).Published as part of Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, pp. 1-109 in Zootaxa 2701 on pages 55-5
Measurement of the isospin asymmetry in B -> K(*) mu+mu- decays
No full textThe isospin asymmetries of B → K (∗) μ + μ − decays and the partial branching fractions of B 0 → K 0 μ + μ − and B + → K ∗+ μ + μ − are measured as a function of the di-muon mass squared q 2 using an integrated luminosity of 1.0 fb−1 collected with the LHCb detector. The B → Kμ + μ − isospin asymmetry integrated over q 2 is negative, deviating from zero with over 4 σ significance. The B → K ∗ μ + μ − decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay B 0 → K S μ + μ − is reported with 5.7 σ significance. Assuming that the branching fraction of B 0 → K 0 μ + μ − is twice that of B 0 → K S μ + μ −, the branching fractions of B 0 → K 0 μ + μ − and B → K ∗+ μ + μ − are found to be (0.31−0.06) × 10−6 and (1.16 ± 0.19) × 10−6, respectively
Eosentomon furunoi Nakamura 2010, sp. nov.
No full textEosentomon furunoi Nakamura sp. nov. Figs. 21–22; Table 8 Type specimens. Holotype female (NSMT –Ap 471), Mt. Nokogiri–yama, Ashio–machi, Tochigi Prefecture, 36º40'41"N, 139º20'21"E, 1998 m elevation, litter of a forest dominated by Tsuga diversifolia and R. bracycarpum, 5-X-1997, K. Furuno et al. leg. Paratype: 1 male (NSMT –Ap 472), same data as for the holotype. Other specimen examined. One maturus junior, same data as for the holotype. Description. Body length 1378 (1248) µm. Head 109 (113) µm long, 84 (89) µm wide. Setae aa, pa and m4 present, sensilla as and ps present (Fig. 21A); seta sp 1.4 times longer than p; sensilla pp rudimentary. Labral setae present (Fig. 21B). Seta rs inflated, shorter than sr (Fig. 21B). On maxillary palpus (Fig. 21C) sensillum md longer than ml. Digits on galea small, O longer than M and I (Fig. 21D). Mandible with three teeth (Fig. 21E). Clypeal apodemes distinct (Figs. 21A, B). Pseudoculus about 16 µm long, with no inner structure, PR = 7. Foretarsus length (Figs. 21F, G) 125 (120) µm; claw 27 (28) µm, TR =4.8 (4.6); empodium 22 (26) µm, EU = 0.8 (1.0); sensillum s longer than claw. Sensillum t1 nearer to α 3 than to α 3', BS = 0.8 (0.7); t2 thinly spatulate; t3 small and thinly club-shaped; a not reaching base of γ 2; b surpassing base of β 6; c not reaching base of γ 3; d slightly broadened distally and almost reaching base of α 5; e and g spatulate and long; f1 slightly spatulate; f2 small and thinly club-shaped; a' reaching base of α 3', at almost same level with t1; b'1 thin, at halfway between δ 3' and δ 4'; b'2 thinly spatulate; c' small, not surpassing base of δ 6. Length of middle tarsus 67 (65) µm, length of claw 19 (18) µm; hind tarsus 80 (88) µm, claw 21 (22) µm; empodia of both tarsi shorter than 1/10 of claw length (Fig. 21H); on hind tarsus (Fig. 21H) D2 and D4 similar, spine-like. Tracheal camerae weak, often invisible (Fig. 22A). Central lobe weak, slightly sinuate (Fig. 22B). Laterostigmata II–IV large, without inner structure; those on V–VII small. On female squama genitalis (Fig. 22C) caput processus thin and curved toward median edge, corpus processus weak, alae processus long, filum processus short, proximo-lateral and median sclerotization present. Male genitalis with long basiperiphallar setae (Fig. 22D). Chaetotaxy as in Table 8. On thoracic tergites II–III, P1a and P2a seta-like; P1a posterior to P1–P2 and halfway between P1 and P2. P1a on abdominal tergite I, P1a and P2a on II–VI and P2a on VII filiform and longer than P1; P1a on VII sensillum-like and shorter than one-seventh length of P1, 4 µm long, posterior to P1–P2; on tergite VIII (Fig. 22E) P1a' without basal dilatation and anterior to P2; P2a short linear. Maturus junior. Body length 923 µm. Head 107 µm long, 89 µm wide; pseudoculus indistinct. Foretarsus length 118 µm; claw 24 µm, TR = 5.0; empodium 23 µm, EU = 0.95; sensillum s 28 µm; BS = 0.8. Length of middle tarsus 62 µm, length of claw 17 µm; hind tarsus 78 µm, claw 20 µm. Diagnosis. This species is similar to E. asahi from Japan (Imadaté, 1961a, 1974b, 1995), China (Yin, 1999; Yin & Xie,1993) and Khabarovsk, Russian Far East (Nakamura, 2004a) and E. juni Imadaté from Japan (Imadaté, 1994c, 1995). These species commonly have foretarsal sensillum b'1, four pairs of anterior setae on the abdominal tergite V–VI, two pairs of anterior setae on the abdominal tergite VII, two anterior and seven posterior setae on the abdominal sternite VIII, six setae on the abdominal sternites IX–X and pseudoculus without inner structure. However, the present species differs from the latter two in the form of female squama genitalis. Eosentomon asahi belongs to the swani -group and E. juni to the wheeleri -group (Tuxen 1964), but the present new species does not belong to either group. The present species is distinguished from E. asahi by the positions of foretarsal sensilla t1 closer to α 3 than to α 3' (closer to α 3' in E. asahi) and a' at almost same level with t1 (same level with α 3 in E. asahi), and from E. juni by the shapes of inflated seta rs (simple in E. juni) and rudimentary sensilla pp (distinct in E. juni) and the value of PR (7 in E. furunoi sp. nov., 11–12 in E. juni). Chaetotaxic variation observed consisted of the asymmetric presence of A5 on the abdominal tergites III, IV and VI in maturus junior. Etymology. The specific name is dedicated to Mr. Katsuhisa Furuno, who kindly supplied me with ample materials from Tochigi Prefecture. Distribution. Japan (Honshu, known only from the type locality).Published as part of Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, pp. 1-109 in Zootaxa 2701 on pages 38-4
Data for: Information seeking mechanism of neural populations in the lateral prefrontal cortex
No full textData of unit recording from monkeys that performed information seeking tasks.Data obtained from monkeys S (Data_table_Nakamura1) and R (Data_table_Nakamura2). Each sheet stores data concerning one neuron. Entries of A1 and A2 are the sites of the neuron on rostral-caudal and dorsal-ventral axes, respectively. The i-th entries in columns C and D are times at onset of the six dots and the second onset of the central cross fixation in the i-th trial of task A, respectively. All values of time in these tables indicate times after onset of the computer program that presents visual stimuli of the behavioral tasks and detects monkeys’ eye movements. Value 0 indicates that monkeys ended the trial before the corresponding event. The i-th entry in column E is the firing time of the i-th spike of the neuron in task A. The i-th entries in columns G, H, and I are times at onset of the six dots, the second onset of the central cross fixation, and the third onset of the central cross fixation in the i-th trial of task B, respectively. The i-th entry in column J is the firing time of the i-th spike of the neuron in task B.The i-th entries in columns K and L are times at onset of the six dots and the second onset of the central cross fixation in the i-th trial of task C, respectively. The i-th entry in column M is the firing time of the i-th spike of the neuron in task C.The i-th entries in column O are times at onset of the six dots in the i-th trial of task D, respectively. The i-th entry in column P is the firing time of the i-th spike of the neuron in task D
Eosentomon dubium Nakamura 2010, sp. nov.
No full textEosentomon dubium Nakamura sp. nov. Figs. 19–20; Table 7 Type specimens. Holotype female (NSMT –Ap 467), Jouin –ji, Tsukiya –cho, Ashikaga –shi, Tochigi Prefecture, 36º22'48"N, 139º26'31"E, 225 m elevation, litter of a plantation of Cr. japonica, 12-VII-1997, K. Furuno et al. leg. Paratypes: 2 males (NSMT –Ap 468–469), same data as for the holotype; 1 female (NSMT –Ap 470), Mansho, Yano, Kamiizumi –mura, Saitama Prefecture, 36º07'12"N, 139º01'14"E, litter of a forest dominated by Q. myrsinaefolia, 450 m elevation, 24-VIII-1993, O. Nakamura leg. Other specimens examined. One male, 1 female, Iwasaki, Toyohashi –shi, Aichi Prefecture, 150 m elevation, 7-XII-1977, K. Niijima leg.; 1 male, Omoto –dake, Ishigaki Island, Okinawa Prefecture, 24º25'28"N, 124º10'49"E, 450 m elevation, litter of a evergreen broad-leaved forest, 24-V-2000, H. Mizushima leg.; 1 male, Komi, Iriomote Island, Okinawa Prefecture, 24º19'28"N, 123º54'09"E, 20 m elevation, litter of a evergreen broad-leaved forest, 2- III- 2002, S. Nagashima leg.; 1 female, Ohara, Iriomote Island, Okinawa Prefecture, 24º16'35"N, 123º52'10"E, 40 m elevation, litter of a forest dominated by Pandnus odoratissimus, 29-V-2000, H. Mizushima leg. Description. Body length 572 (520–702) µm. Head 85 (86–89) µm long. Setae aa, pa and m4 present, sensilla as and ps present (Fig. 19A); seta sp 1.5 (1.4–1.5) times longer than p; sensilla pp rudimentary. Labral setae present (Fig. 19B). Seta rs inflated, equal to sr in length (Fig. 19B). On maxillary palpus (Fig. 19C) sensillum md slightly longer than ml. On galea (Fig. 19D) digit O longer and more slender than M and I; M and I close to each other. Mandible with 3 teeth (Fig. 19E). Clypeal apodemes distinct (Fig. 19F). Pseudoculus circular (Fig. 19G), 11 (12– 14) µm long, PR = 8 (6–8). Foretarsus length (Figs. 19H, I) 57 (57–58) µm; claw 13 (12–13) µm, TR = 5; empodium slightly shorter than claw, 13 (12–13) µm, EU = 1.0; sensillum s slightly longer than claw, 14 (13) µm. Sensillum t1 closer to α 3 than to α 3', BS = 0.8 (0.8–0.9); t2 thinly spatulate; t3 long, surpassing base of α 7; a closer to γ 1 than to γ 2; b spatulate; c slightly broadened; d broadened, surpassing base of α 6; e and g roundedly spatulate and long; f1 thinly spatulate; f2 long, reaching base of γ 5; a' at same level with α 3; b'1 slightly broadened and nearer to δ 3' than to δ 4'; b'2 thinly spatulate; c' absent. Length of middle tarsus 26 (26–28) µm, length of claw 9 µm; empodium short and less than 1/ 4 of claw length (Fig. 19J), 1 (1–2) µm long; hind tarsus 31 (30–35) µm, claw 10 (9–11) µm; empodium about 2/3 of claw length (Fig. 19K), 7 (5–7) µm; on hind tarsus (Fig. 19K) D2 and D4 spine-like, somewhat more slender than D5. Tracheal camerae thin (Fig. 19L). Central lobe trapezoidal, inner line constricted in middle (Fig. 19M). Laterostigmata II–III distinct, with no inner structure. On female squama genitalis (Fig. 19N) S-shaped sclerotization on processus sternalis, caput processus duck’s head-like, filum processus long. Male genitalis with short basiperiphallar setae. Chaetotaxy as in Table 7. On thoracic tergites II–III, P1a seta-like, posterior to P1–P2; P2a seta-like, nearer to P2 than to P3. P1a on abdominal tergite I, P1a and P2a on II–VI, and P2a on VII filiform and longer than P1 (Fig. 20A); P1a on VII sensillum-like and about one-third length of P1, posterior to P1–P2 (Fig. 20B); on tergite VIII (Fig. 20C) P1a' oblong and anterior to P2; P1a' and P2 nearly the same level with M4; P2a linear. Diagnosis. This species is similar to E. udagawai Imadaté from Japan (Imadaté, 1961b, 1974b, 1995), Korea (Imadaté & Szeptycki, 1976) and Taiwan (Chao & Chen, 1996) and E. orientalis Yin from China (Yin, 1965, 1999) in the absent or rudimentary foretarsal sensillum c', possession of a long empodium on hind tarsus, two anterior and seven posterior setae on abdominal tergite VIII, and six setae on abdominal sternites IX–X. However, this new species differs from E. udagawai in the presence of labral setae (absent in E. udagawai) and the short empodium on middle tarsus (1/3 of claw length in E. udagawai), and from E. orientalis in pseudoculus with no inner structure (three striae present in E. orientalis) and five pairs of anterior setae on abdominal tergites V–VI (four pairs in E. orientalis). Etymology. The specific name refers to the similarity and long confusion of this species with E. udagawai. Distribution. Japan (Honshu and Okinawa).Published as part of Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, pp. 1-109 in Zootaxa 2701 on pages 35-3
A non destructive method for damage detection in steel-concrete composite structures based on finite eigendata
No full textThis paper proposes a non-destructive method for damage detection
in steel-concrete beams based on finite spectral data associated
to a given set of boundary conditions. The inverse problem
consists in determining two stiffness coefficients of the
connection between the steel beam and the concrete beam. The
inverse problem is transformed to a variational problem for a cost
function which includes eigenvalue data and transversal
displacements of eigenfunctions. A projected gradient
method which uses the analytical expressions of the first partial derivatives of the eigenvalues
and eigenfunctions is proposed for identifying the unknown
coefficients. The results of an extended series of numerical
simulations on real steel-concrete beams are presented and discussed
Numerical method for an inverse dynamical problem for composite beams
No full textIn this paper we present a numerical method for an inverse problem of
nondestructive testing for a composite system formed by the connection of a steel beam and a
reinforced concrete beam. The small vibrations of the composite beam are governed in space
by two second order and two fourth order dierential operators, which are coupled in the lower
order terms by two coecients which express the shearing and axial stiness of the connection.
Our inverse problem is to determine these stiness coecients by using Neumann type boundary
data measured at one end of the beam and transversal displacements given in an interior portion
of the beam axis. We recast the inverse problem as a constrained variational issue and an iterated
projected gradient method is proposed for the numerical solution of the minimizing problem.
Suitable clip-o and mollifier operators are introduced in order to describe the constrained
conditions. The eectiveness of method and the sensitivity of the results to errors in the
measured data are tested on the basis of an extensive series of numerical experiments
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