A Huge Thecodont Skull From The Triassic of Brazil

Este trabalho trata da descrição geral de um crânio do tecodonte Prestosuchus chiniquensis, coletado na Sanga Pascual, perto de Candelária, no Estado do Rio Grande do Sul, sul do Brasil. As afinidades desta forma são discutidas, indicando sua posição intermediária entre Luperosuchus e Saurosuchus. Suas implicações bioestratigráficas e evolutivas são também comentadas, no contexto do Triássico da América do Sul

\u27A Frangesa! : March

https://digitalcommons.library.umaine.edu/mmb-ps/1729/thumbnail.jp

ANALISA PENGARUH BEBAN TIDAK SEIMBANG PADA PERFORMA JARINGAN DISTRIBUSI 20 KV DI DILI - TIMOR LESTE DENGAN MENGGUNAKAN SOFTWARE ETAP (UNBALANCE )

ANALISA PENGARUH BEBAN TIDAK SEIMBANG PADA PERFORMA JARINGAN DISTRIBUSI 20 KV DI DILI - TIMOR LESTE DENGAN MENGGUNAKAN SOFTWARE ETAP (UNBALANCE ) Mario da costa Soares : nim 1212024 Dosen pembimbing 1 : Irrine Budi S. ST,MT Dosen pembimbing 2 : Ir.choirul saleh , MT Jurusan Teknik Elektro S–1,Konsentrasi Teknik Energ Listrik S-1 Fakultas Teknologi Industri, Institut Teknologi Nasional Malang Jl.Raya Karanglo KM 2 Malang Email :[email protected] Abstrak Unbalance merupakan Ketidakseimbangan beban pada suatu sistem distribusi tenaga listrik selalu terjadi dan penyebab ketidakseimbangan tersebut adalah pada beban-beban satu fasa pada pelanggan jaringan tegangan rendah. Akibat ketidakseimbangan beban tersebut muncullah arus di netral trafo. Arus yang mengalir di netral trafo ini menyebabkan terjadinya losses (rugi-rugi), yaitu losses akibat adanya arus netral pada penghantar netral trafo dan losses akibat arus netral yang mengalir ke tanah. Setelah dianalisa, diperoleh bahwa bila terjadi ketidakseimbangan beban yang besar 48,4kw, dan 89.0 kvar maka arus netral yang muncul juga besar (9019.5 A) dan losses akibat arus netral yang mengalir ke tanah semakin pula besar maka sebesar 5762 amper dan setlah melakukan setingan arus yang mengalir lewat tanah semakin kecil sebesar 7380,6 Amper. Kata kunci adalah : pengaruh ketidaksimbangan beban Pada trafo dan rugi-rugi( losses

Imaging material properties of biological samples with a Force Feedback Microscope

Mechanical properties of biological samples have been imaged with a \textit{Force Feedback Microscope}. Force, force gradient and dissipation are measured simultaneously and quantitatively, merely knowing the AFM cantilever spring constant. Our first results demonstrate that this robust method provides quantitative high resolution force measurements of the interaction The little oscillation imposed to the cantilever and the small value of its stiffness result in a vibrational energy much smaller than the thermal energy, reducing the interaction with the sample to a minimum. We show that the observed mechanical properties of the sample depend on the force applied by the tip and consequently on the sample indentation. Moreover, the frequency of the excitation imposed to the cantilever can be chosen arbitrarily, opening the way to frequency-dependent studies in biomechanics, sort of spectroscopic AFM investigations

Spectroscopic investigation of local mechanical impedance of living cells

The mechanical properties of PC12 living cells have been studied at the nanoscale with a Force Feedback Microscope using two experimental approaches. Firstly, the local mechanical impedance of the cell membrane has been mapped simultaneously to the cell morphology at constant force. As the force of the interaction is gradually increased, we observed the appearance of the sub-membrane cytoskeleton. We shall compare the results obtained with this method with the measurement of other existing techniques. Secondly, a spectroscopic investigation has been performed varying the indentation of the tip in the cell membrane and consequently the force applied on it. In contrast with conventional dynamic atomic force microscopy techniques, here the small oscillation amplitude of the tip is not necessarily imposed at the cantilever first eigenmode. This allows the user to arbitrarily choose the excitation frequency in developing spectroscopic AFM techniques. The mechanical response of the PC12 cell membrane is found to be frequency dependent in the 1 kHz - 10 kHz range. The damping coefficient is reproducibly observed to decrease when the excitation frequency is increased.Comment: 8 pages, 8 figure

Out of equilibrium anomalous elastic response of a water nano-meniscus

We report the observation of a transition in the dynamical properties of water nano-menicus which dramatically change when probed at different time scales. Using a AFM mode that we name Force Feedback Microscopy, we observe this change in the simultaneous measurements, at different frequencies, of the stiffness G'(N/m), the dissipative coefficient G''(kg/sec) together with the static force. At low frequency we observe a negative stiffness as expected for capillary forces. As the measuring time approaches the microsecond, the dynamic response exhibits a transition toward a very large positive stiffness. When evaporation and condensation gradually lose efficiency, the contact line progressively becomes immobile. This transition is essentially controlled by variations of Laplace pressure

Proper motions of Local Group dwarf spheroidal galaxies I: First ground-based results for Fornax

In this paper we present in detail the methodology and the first results of a ground-based program to determine the absolute proper motion of the Fornax dwarf spheroidal galaxy. The proper motion was determined using bona-fide Fornax star members measured with respect to a fiducial at-rest background spectroscopically confirmed Quasar, \qso. Our homogeneous measurements, based on this one Quasar gives a value of (\mua,\mud)$= (0.64 \pm 0.08, -0.01 \pm 0.11)$ \masy. There are only two other (astrometric) determinations for the transverse motion of Fornax: one based on a combination of plates and HST data, and another (of higher internal precision) based on HST data. We show that our proper motion errors are similar to those derived from HST measurements on individual QSOs. We provide evidence that, as far as we can determine it, our motion is not affected by magnitude, color, or other potential systematic effects. Last epoch measurements and reductions are underway for other four Quasar fields of this galaxy, which, when combined, should yield proper motions with a weighted mean error of $\sim50\,\mu$as y$^{-1}$, allowing us to place important constraints on the orbit of Fornax.Comment: Accepted for publication in Publications of the Astronomical Society of the Pacific, PASP. To appear in July issue. 64 pages, 18 figure

The weight of patriarchy? Gender obesity gaps in the Middle East and North Africa (MENA)

The worldwide obesity epidemic has impacted women more heavily than men. These gender-based differences are particularly pronounced in the Middle East and North Africa (MENA) region where gender obesity gaps on average exceed 10 percentage points. This paper examines one of the explanations, namely the role of female empowerment on gender gaps in obesity. We study the effect of several measures of female empowerment including female labor market participation on gender obesity gaps over a time span of 41 years (1975-2016) in a sample of 190 countries. We document that after controlling for a number relevant controls, gender obesity gaps are only associated to measures of female empowerment in the MENA region but that this is not true worldwide. We then use an instrumental variable approach in order to illustrate that the causality runs indeed from empowerment, proxy it by both labor market and political participation to gender obesity gaps and not vice versa. Our results reveal that a one percentage point increase in female labor market participation (female MPs in national parliament) predicts a 0.2 (0.09) percentage point decrease in gender gaps in obesity in the MENA regio