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Search Results: 1 - 10 of 461909 matches for " A. Cavalleri "
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New records of thrips (Thysanoptera) species in Brazil
Cavalleri, A;Lima, MGA;Melo, FS;Mendon?a JR, MS;
Neotropical Entomology , 2011, DOI: 10.1590/S1519-566X2011000500019
Abstract: this study reports four thrips species from brazil for the first time: the terebrantians aptinothrips rufus (haliday) and echinothrips caribbeanus hood; and the tubuliferans androthrips ramachandrai karny and gynaikothrips uzeli (zimmermann). new data about biological aspects of some of these new records are presented.
Comment on "Terahertz time-domain spectroscopy of transient metallic and superconducting states" (arXiv:1506.06758)
D. Nicoletti,M. Mitrano,A. Cantaluppi,A. Cavalleri
Physics , 2015,
Abstract: We comment on the model proposed by Orenstein and Dodge in arXiv:1506.06758v1, which describes time-domain terahertz measurements of transiently generated, high-electron-mobility (or superconducting) phases of solids. The authors' main conclusion is that time-domain terahertz spectroscopy does not measure a response function that is mathematically identical to the transient optical conductivity. We show that although this is correct, the difference between the measured response function and the microscopic optical conductivity is small for realistic experimental parameters. We also show that for the experiments reported by our group on light-induced superconducting-like phases in cuprates and in organic conductors, the time-domain terahertz yields a very good estimate for the optical conductivity.
Gabriele de Rosa (1917-2009), in memoriam
Cesare Cavalleri
Anuario de Historia de la Iglesia , 2011,
Abstract:
Species composition and structure of Thysanoptera communities in different microhabitats at the Parque Estadual de Itapu?, Viam?o, RS
Pinent, S. M. J.;Romanowski, H. P.;Redaelli, L. R.;Cavalleri, A.;
Brazilian Journal of Biology , 2006, DOI: 10.1590/S1519-69842006000500002
Abstract: although thrips are known as inhabitants of flowers, they are also abundant and diverse in other microhabitats. there is an information gap concerning them, especially related to the native fauna in southern brazil. the structure and composition of the thysanopteran community in different microhabitats was studied at the "parque estadual de itapu?" (30° 22' s 51° 02' w), rs, southern brazil. between june 1999 and may 2001, branches (n = 1,274), flowers (n = 774), grass tussocks (n = 596) and leaf litter (n = 603) were sampled systematically in 20 points of four trails (t1 - pedreira beach, t2 - ara?á beach, t3 - lagoinha, and t4 - grota hill). we found 2,197 adult thrips determined in 73 species in 41 genera, of which 37 could be nominated. four families are represented, thripidae, phlaeothripidae, heterothripidae and merothripidae, with the first the most abundant (n = 1,599) and with the highest species richness (s = 32). the highest thrips abundance occurred in flowers n = 1,224 and the highest number of exclusive species occurred in the leaf litter (27). frankliniella rodeos moulton, 1933, frankliniella gemina bagnall, 1919 and smicrothrips particula hood, 1952 comprise 49.4% of the total sampled. regarding t2, we obtained the highest abundance (n = 935) and highest species richness (s = 43). the composition of the faunas in each kind of environment proved very particular.
Thrips species (Thysanoptera, Terebrantia) inhabiting irrigated rice and surrounding habitats in Cachoeirinha, state of Rio Grande do Sul, Brazil
Cavalleri, Adriano;Mendon?a Jr, Milton de Souza;Rodrigues, Everton Nei Lopes;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000300023
Abstract: in brazil, almost nothing is known about the thrips fauna associated with rice crops. this is especially true for rio grande do sul state (rs), the major rice producer in brazil, where no systematic surveys have been conducted. thus, this work records preliminarily the species of suborder terebrantia inhabitanting irrigated rice (rc) and three nearby habitats: the area selected for rice, before cultivation (br), grassland (gr) and forest border (fb) in cachoeirinha, rs (50o58'21"w; 29o55'30"s). eight field trips were carried out between october/2004 and february/2005 to esta??o experimental do arroz in cachoeirinha. thrips specimens were collected with sweeping net and transported to laboratory for identification. a total of 623 adults terebrantians were recorded, belonging to two families and 18 species. frankliniella rodeos (55.5%), neohydatothrips cf. paraensis (30.3%) and frankliniella schultzei (5.6%), were the most abundant, comprising more than 90% of the individuals. fb showed the highest species richness (s=15), followed by gr (s=10), rc (s=9) and br (s=6). fb presented a low number of individuals (14.0%), contrasting with gr (44.8%) and br (36.7%). in general, thrips abundance in rc was low at eea (4.5%), and few species seems to effectively use rice as a host-plant. two species previously considered of economic importance were found, f. rodeos and f. schultzei, the latter a new record for rice in brazil. five species are new records to rs.
Evidence for a Structurally-driven Insulator-to-metal Transition in VO2: a View from the Ultrafast Timescale
A. Cavalleri,Th. Dekorsy,H. H. Chong,J. C. Kieffer,R. W. Schoenlein
Physics , 2004, DOI: 10.1103/PhysRevB.70.161102
Abstract: We apply ultrafast spectroscopy to establish a time-domain hierarchy between structural and electronic effects in a strongly-correlated electron system. We discuss the case of the model system VO2, a prototypical non-magnetic compound that exhibits cell doubling, charge localization and a metal-insulator transition below 340 K. We initiate the formation of the metallic phase by prompt hole photo-doping into the valence band of the low-T insulator. The I-M transition is however delayed with respect to hole injection, exhibiting a bottleneck timescale that corresponds to half period of the phonon connecting the two crystallographic phases. This experiment indicates that this controversial insulator may have important band-like character.
Possibilities for Measurement and Compensation of Stray DC Electric Fields Acting on Drag-Free Test Masses
W. J. Weber,L. Carbone,A. Cavalleri,R. Dolesi,C. D. Hoyle,M. Hueller,S. Vitale
Physics , 2003, DOI: 10.1016/j.asr.2006.03.045
Abstract: DC electric fields can combine with test mass charging and thermal dielectric voltage noise to create significant force noise acting on the drag-free test masses in the LISA (Laser Interferometer Space Antenna) gravitational wave mission. This paper proposes a simple technique to measure and compensate average stray DC potentials at the mV level, yielding substantial reduction in this source of force noise. We discuss the attainable resolution for both flight and ground based experiments.
Achieving geodetic motion for LISA test masses: ground testing result
L. Carbone,A. Cavalleri,R. Dolesi,C. D. Hoyle,M. Hueller,S. Vitale,W. J. Weber
Physics , 2003, DOI: 10.1103/PhysRevLett.91.151101
Abstract: The low-frequency resolution of space-based gravitational wave observatories such as LISA (Laser Interferometry Space Antenna) hinges on the orbital purity of a free-falling reference test mass inside a satellite shield. We present here a torsion pendulum study of the forces that will disturb an orbiting test mass inside a LISA capacitive position sensor. The pendulum, with a measured torque noise floor below 10 fNm/sqrt{Hz} from 0.6 to 10 mHz, has allowed placement of an upper limit on sensor force noise contributions, measurement of the sensor electrostatic stiffness at the 5% level, and detection and compensation of stray DC electrostatic biases at the mV level.
Improved Torsion Pendulum for Ground Testing of LISA Displacement Sensors
L. Carbone,A. Cavalleri,R. Dolesi,C. D. Hoyle,M. Hueller,S. Vitale,W. J. Weber
Physics , 2004,
Abstract: We discuss a new torsion pendulum design for ground testing of prototype LISA (Laser Interferometer Space Antenna) displacement sensors. This new design is directly sensitive to net forces and therefore provides a more representative test of the noisy forces and parasitic stiffnesses acting on the test mass as compared to previous ground-based experiments. We also discuss a specific application to the measurement of thermal gradient effects.
Upper limits on stray force noise for LISA
L. Carbone,A. Cavalleri,R. Dolesi,C. D. Hoyle,M. Hueller,S. Vitale,W. J. Weber
Physics , 2003, DOI: 10.1088/0264-9381/21/5/033
Abstract: We have developed a torsion pendulum facility for LISA gravitational reference sensor ground testing that allows us to put significant upper limits on residual stray forces exerted by LISA-like position sensors on a representative test mass and to characterize specific sources of disturbances for LISA. We present here the details of the facility, the experimental procedures used to maximize its sensitivity, and the techniques used to characterize the pendulum itself that allowed us to reach a torque sensitivity below 20 fNm /sqrt{Hz} from 0.3 to 10 mHz. We also discuss the implications of the obtained results for LISA.
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