Sample records for aggradi flavio esposito

  1. The April 2009 L'Aquila (Italy) seismic sequence: recordings in the Anfiteatro Flavio (Colosseum)

    NASA Astrophysics Data System (ADS)

    Caserta, A.; Marra, F.; Cara, F.; Valente, G.


    We show a preliminary study concerning the interaction of the seismic wave-field coming from aftershocks of the 2009 seismic sequence in Abruzzo and the structure of the Anfiteatro Flavio, usually called Colosseum. By using mainly Arias intensity, we assess how the incoming energy beneath the foundations is convoyed into the monument, through what preferential frequencies such process takes place, how the trapped energy increases amplitude vibration with floors. Moreover, we also investigate the role played by the near-surface geology in generating differential motions below the monument foundations. In addition we also check, in a preliminary way, the foundation dynamical behaviour under the action of the incoming wave-field.

  2. Comparative Book Review of Unholy War: Terror in the Name of Islam and The Crisis of Islam: Holy War and Unholy Terror

    DTIC Science & Technology


    L. Esposito, Oxford University Press , New York, 2002; and The Crisis of Islam: Holy War and Unholy Terror. By Bernard Lewis, The Modern Library...John L. Esposito, Unholy War: Terror in the Name of Islam (New York: Oxford University Press , 2002), 21. 4 John L. Esposito, Unholy War: Terror in...the Name of Islam (New York: Oxford University Press , 2002), 24, 153. 5 John L. Esposito, Unholy War: Terror in the Name of Islam (New York: Oxford

  3. Investing in the Future by Learning from the Past: Developing a Survey Tool to Gather Feedback from Deployed Army Forward Surgical Team

    DTIC Science & Technology


    evaluated (Esposito, Kuby , Unfred, & Gamelli, 1995) . Southern Ohio Medical Center (SOMC) uses scaled surveys to gather statistically relevant...Esposito, T., Kuby , A., Unfred, C., & Gamelli, R. (1995). General surgeons and the advanced trauma life support course: is it time to re-focus? The Journal

  4. Manufacturing Methods & Technology. Project Execution Report. Second Half CY79.

    DTIC Science & Technology


    Communications R&D Command ATTN: DRDCO-PPA-TP, Mr. Al Feddeler/Sam Esposito/Burton Resnic Building 2700 C: 201 535-2418/4262/4026 Fort Monmouth, NJ 07703...Cdr, CORADCOM, Attn: DRDCO-PPA-TP, Mr. Al Feddeler/Sam Esposito/Burton Resnic 207 DRXI B-MT DISTRIBUTION (Cont’d): MT Representatives (Cont’d): Cdr

  5. Manufacturing Methods & Technology Project Execution Report Second CY 82

    DTIC Science & Technology


    63120 CECOM US Army Communications Electronics Command ATTN: DRSEL-POD-P-G, Messr Feddeler/Esposito/ Resnic ATTN: DRSEL-PC-I-IP, Mr. Leon Field...Cdr, Attn: DRSEL Cdr, Attn: DRSEL-PC-I-IP, Mr. Leon Field Cdr, Attn: DRSEL-POD-P-G, Messrs. Feddeler, Esposito, Resnic (1 cy ea) RD&E

  6. Manufacturing Methods & Technology Program Plan CY 1982

    DTIC Science & Technology


    DRSEL-POD-P-G, Messr Feddeler/Esposito/ Resnic ATTN: DRSEL-PC-I-IP-1, Mr. Leon Field Fort Monmouth, NJ 07703 C: 201 535-4926 AV: 995-4926 C: 201...Messrs. Feddeler, Esposito, Resnic (1 cy ea) RD&E Technical Documents Ctr, Ft. Monmouth, NJ DESCOM: Cdr, Attn: DRSDS Cdr, Attn: DRSDS-PE, Mr. Jim

  7. Manufacturing Methods and Technology Project Execution Report, Second CY 81

    DTIC Science & Technology


    Messr Feddeler/Esposito/ Resnic C: 201 535-4926 AV: 995-4926 ATTN: DRSEL-LE-R, Mr. Leon Field Fort Monmouth, NJ 07703 C: 201 532-4035 AV: 992...Attn: DRSEL Cdr, Attn: DRSEL-LE-RI, Mr. Leon Field Cdr, Attn: DRSEL-POD-P-G, Messrs. Feddeler, Esposito, Resnic (1 cy ea) RD&E Technical

  8. Manufacturing Methods and Technology Project Execution Report.

    DTIC Science & Technology


    201 535-4926 Esposito, Resnic AV: 995-4926 US Army Communications Electronics Command ATTN: AMSEL-PC-SI-I/Mr. Leon Field C: 201 532-4035 Fort...22060 US Army Communications Electronics Command, ATTN: AMSEL-POD-P-G/Mr. Sam Esposito, Mr. Al Feddeler, Mr. Bert Resnic , AMSEL-PC-SI-I/Mr. Leon Field

  9. Manufacturing Methods and Technology Program Plan, CY 1984.

    DTIC Science & Technology


    4926 Esposito, Resnic AV: 995-4926 US Army Communications Electronics Command ATTN: AMSEL-PC-SI-I/Mr. Leon Field C: 201 532-4035 Fort Monmouth, NJ...G, Mr. Sam Esposito, Mr. Al Feddeler, Mr. Bert Resnic , AMSEL-PC-SI-I/Mr. Leon Field, RD&E Technical Documents Center, Ft. Monmouth, NJ 07703 US Army

  10. Manufacturing Methods and Technology Program Plan, CY 1983,

    DTIC Science & Technology


    Army Communications Electronics Command C: 201 535-4926 ATTN: DRSEL-POD-P-G, Messr Feddeler/Esposito/ Resnic AV: 995-4926 ATTN: DRSEL-PC-I-IP, Mr...DRSEL-POD-P-G, Messrs. Feddeler, Esposito, Resnic (I cy ea) RL4E Technical Documents Gtr, Ft. Monmouth, NJ DESCOM. Cdr, Attn: DRSDS Cdr, Attn: DRSDS-RM

  11. A Neighborhood Story

    ERIC Educational Resources Information Center

    Gerrish, Michael


    Blue collar doesn't have to mean drab and dull. At least, not to Troy, New York, historian Mike Esposito, who is a member of a neighborhood revitalization movement seeking to celebrate the people and events that brought diversity, prosperity, and vitality to this upstate New York community more than 100 years ago. Esposito and others invited…

  12. A New Direction Toward a More Secure America

    DTIC Science & Technology


    10 Emily Friedman, Richard Esposito, Ethan Nelson, Desiree Adib , “Fort Hood Gunman Who...Esposito, Ethan Nelson, and Desiree Adib . “Fort Hood Gunman Who Killed 12, Wounded 30 Survived Gun Battle.”

  13. Manufacturing Methods & Technology Project Execution Report. First CY 83.

    DTIC Science & Technology


    201 535-4926 ATTN: DRSEL-POD-P-G, Messr Feddeler/Esposito/ Resnic AV: 995-4926 ATTN: DRSEL-PC-I-IP, Mr. Leon Field C: 201 532-4035 Fort Monmouth, NJ...Esposito, Resnic (1 cy ea) RD&E Technical Documents Ctr, Ft. Monmouth, NJ DESCOM: Cdr, Attn: DRSDS-RM-EIT, Mr. Mike Ahearn ERADCOM: Cdr, Attn: DELET-R, Mr. J

  14. Perezhivanie and Classroom Discourse: A Cultural-Historical Perspective on "Discourse of Design Based Science Classroom Activities"

    ERIC Educational Resources Information Center

    Adams, Megan; March, Sue


    Flavio Azevedo, Peggy Martalock and Tugba Keser challenge the "argumentation focus of science lessons" and propose that through a 'design-based approach' emergent conversations with the teacher offer possibilities for different types of discussions to enhance pedagogical discourse in science classrooms. This important paper offers a…

  15. 77 FR 52688 - Initiation of Antidumping and Countervailing Duty Administrative Reviews and Request for...

    Federal Register 2010, 2011, 2012, 2013, 2014


    ... Sales at Less Than Fair Value: Sparklers from the People's Republic of China, 56 FR 20588 (May 6, 1991...'s Republic of China, 59 FR 22585 (May 2, 1994). In accordance with the separate rates criteria, the... e Adalberto Fratelli S.p.A Valdigrano di Flavio Pagani S.r.L Russia Federation: Solid Urea,...

  16. A Cultural Historical Theoretical Perspective of Discourse and Design in the Science Classroom

    ERIC Educational Resources Information Center

    Adams, Megan


    Flavio Azevedo, Peggy Martalock and Tugba Keser have initiated an important conversation in science education as they use sociocultural theory to introduce design based scenarios into the science classroom. This response seeks to expand Azevedo, Martalock and Keser's article "The discourse of design-based science classroom activities" by…

  17. Scorpionism in Ecuador: First report of severe and fatal envenoming cases from northern Manabí by Tityus asthenes Pocock.


    Borges, Adolfo; Morales, Melva; Loor, Wilmer; Delgado, Miguel


    The presence in rural areas of western Ecuador of scorpions in the genus Tityus capable of producing pediatric mortality is hereby evidenced. The medical significance of scorpions in Ecuador has been underestimated partly because of the clinically unimportant stings delivered by Centruroides margaritatus and Teuthraustes atramentarius, which have venom with low toxicity to vertebrates. Five intra-domiciliary cases of scorpion envenoming in victims aged between 1.9 and 16 years old, including one fatality, are reported from rural settings in forest areas of Chone (n = 2) and Flavio Alfaro (n = 3) counties, northern Manabí province, western Ecuador. Three cases were graded as Class II (moderate) and two in Class III (severe) envenoming. Manifestations showed characteristic autonomic nervous system hyper-stimulation and the fatality (a 1.9-year-old boy from Flavio Alfaro) was due to cardio-respiratory failure. Marked leukocytosis in four of the cases (21,800-31,800 cells/mm(3)), with notable neutrophilia (58-82%), suggests induction of a venom-mediated systemic inflammatory response-like syndrome. Specimens responsible for cases in Flavio Alfaro County, including the fatality, were classified as Tityus asthenes Pocock, accountable for severe scorpionism in Colombia. These findings demand implementation of control and therapeutic measures in affected areas in Ecuador, including evaluation of available scorpion antivenoms.

  18. Manufacturing Methods and Technology Program Accomplishments

    DTIC Science & Technology


    Resnic Building 2700 C: 201 535-2418/4262/4026 Fort Monmouth, NJ 07703 AV: 995-2418/4262/4026 ERADCOM US Army Electronics R&D Command ATTN: DELET-R...Mr. Martin Ides Cdr, CORADCOM, Attn: DRDCO-PPA-TP, hr. Al Feddeler/Sam Esposito/Burton Resnic 55 N-.- t- i DRXIB-MT N DISTRIBUTION (Cont’d) : MT

  19. Manufacturing Methods and Technology Program Plan, CY 1981.

    DTIC Science & Technology


    63120 AV: 693-1625 ChCOlm US Army Communications & Electronics Command ATTN: DRSEL-POD-P-G, Messr Feddeler/Esposito/ Resnic C: 201 535-4926 AV: 995... Resnic (I cy ea) RD&E Technical Documents Ctr, Ft. Monmouth, NJ DESCOM: Cdr, Attn: DRSDS Cdr, Attn: DRSDS-PE, Mr. Jim Shindle ERADCOM: PM, FIREFINDER

  20. The Effects of Visual and Verbal Satiation on a Lexical Decision Task

    ERIC Educational Resources Information Center

    Neely, James H.


    Examines, within a single experiment, whether the conditions exist for drawing a valid inference about the possibility of a word losing its meaning through either visual satiation or visual "and" verbal satiation. Evaluates research by Fillenbaum (1964) and Esposito and Pelton (1969). (Author/RK)

  1. Where Is the Love? An Interrogation of Love in VH1's "Love and Hip Hop New York" and a Call to Educators to Respond to Anti-Love Messages

    ERIC Educational Resources Information Center

    Edwards, Erica; Esposito, Jennifer


    In this article, Erica Edwards and Jennifer Esposito review the fourth season of "Love and Hip Hop New York," which is just a small part of the larger "Love and Hip Hop" reality TV series, which characterizes love through narrow representations of race, gender, and sexuality. Their analysis reports that this television program…

  2. Wireless Connectivity of Swarms in Presence of Obstacles

    DTIC Science & Technology


    Wireless Connectivity of Swarms in Presence of Obstacles Joel Esposito US Naval Academy Thomas Dunbar Naval Postgraduate School Report...TYPE 3. DATES COVERED 00-00-2006 to 00-00-2006 4. TITLE AND SUBTITLE Wireless Connectivity of Swarms in Presence of Obstacles 5a. CONTRACT NUMBER...and Automation, May 2006, p. 946-952 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT Same as Report

  3. The Impact of Police and Media Relations on a Crisis

    DTIC Science & Technology


    trumped by community standards, community standards are viewed more explicit and exact, therefore setting the standard of what is considered...During Major Incidents” (paper presented at the U.S. EPA Regional III Emergency Preparedness and Prevention Conference, Philadelphia, December 2004...print=true. (accessed November 11, 2005). Esposito, Richard. “Media Operations During Major Incidents.” Paper presented at the U.S. EPA Regional

  4. Manufacturing Methods & Technology (MMT) Project Execution Report

    DTIC Science & Technology


    Resnic AV: 995-4926 ATTN: DRSEL-PC-I-IP-1, Mr. Leon Field C: 201 532-4035 Fort Monmouth, NJ 07703 AV: 992-4035 ERADCOM US Army Electronics R&D Command...Spalsbury CECOM: Cdr, Attn: DRSEL Cdr, Attn: DRSEL-PC-I-IP-1, Mr. Leon Field Cdr, Attn: DRSEL-POD-P-G, Messrs. Feddeler, Esposito, Resnic (I cy ea) RD&E

  5. Manufacturing Methods and Technology Program Plan, CY 1986

    DTIC Science & Technology


    Sada Barik ) C: (201) 5 32- 4 035 Fort Monmouth, NJ 07T03 AV: 992-4995 DESCOM U.S. Army Depot Systems Command ATTN: AMSDS-RM-EM (-Mr. Mike Ahearn) C...A.MSETL-PC-SI-I (Mr. Sada Barik ) (-r, ATTN: AMSEL-POD-P-G (Messrs. Feddeler, Esposito, Resnic) Cdt ATTN: RD&E Technical Documents Center PM, 6ITTN: AMCPM

  6. Electron cyclotron emission reconstruction image and m/n=3/2 mode in HT-7 tokamak

    SciTech Connect

    Li Erzhong; Hu Liqun; Ling Bili; Liu Yong; Ti Ang; Chen Kaiyun; Shen Biao; Gao Xiang


    Electron cyclotron emission reconstruction image has been used for flux surface reconstruction. The reconstruction image is based on plasma rigid rotation which is obtained from Mirnov diagnostic. From the reconstructed two-dimensional flux surface, the classical m/n=3/2 mode is visualized, which is of similar spatial structure as neoclassical 3/2 mode observed in some other tokamaks [B. Esposito et al., Phys. Rev. Lett. 100, 045006 (2008)].

  7. A Request for the Conference and Symposia Grant from COMP Division of American Chemical Society

    DTIC Science & Technology


    34Modeling and Simulations of Electrochemical Interfaces and Materials for Energy Storage" symposium within the Computers in Chemistry (COMP) Division of...Laboratory organized the "Modeling and Simulations of Electrochemical Interfaces and Materials for Energy Storage" symposium within the Computers in...Emilio Esposito, Scott Wildman Monday, August 11, 2014 Oral Session Modeling and Simulations of Electrochemical Interfaces and Materials for Energy

  8. Egocentric disorientation following bilateral parietal lobe damage.


    Wilson, Barbara A; Berry, Emma; Gracey, Fergus; Harrison, Claire; Stow, Isabel; Macniven, Jamie; Weatherley, Julia; Young, Andrew W


    Aguirre and D'Esposito (1999) suggested a taxonomy and theoretical framework for understanding topographical disorders. One of the problems they described involved egocentric disorientation, in which deficits are not strictly confined to the topographical sphere but are seen on a wide variety of visuo-spatial paradigms. Here, we report a neuropsychological investigation of MU, a person with egocentric disorientation. To test the usefulness of Aguirre and D'Esposito's framework, we administered tests which were predicted to be easy or difficult for people with egocentric disorientation to show that MU was impaired on tasks sensitive to egocentric disorientation and that he showed adequate performance on tests sensitive to other types of topographical representation. Thus MU showed normal performance on a test of recognition of famous landmarks and he could identify photographs of personally familiar places in his home town, yet he could not say how to get from a recognised building to another place in his environment. His performance fulfils the criteria for egocentric disorientation and fits the predictions derived from Aguirre and D'Esposito's views.

  9. Photometric Analysis of the Jovian Ring System and Modeling of Ring Origin and Evolution

    NASA Technical Reports Server (NTRS)

    Esposito, L. W.


    We have successfully completed the work described in our proposal. The work supported by this grant resulted in the publication of the following paper: Brooks, S. M., L. W. Esposito, M. R. Showalter, and H. B. Throop. 2002. The size distribution of Jupiter's main ring from Galileo imaging and spectroscopy. Icarus, in press. This was also the major part of Dr. Shawn Brooks PhD dissertation. Dr. Brooks gave oral presentations on this work at the Lunar and Planetary Conference, the annual meetings of the Division for Planetary Sciences of the American Astronomical Society, the annual meetings of the European Geophysical Society, the international Jupiter Conference in Boulder, the Jupiter after Galileo and Cassini Conference in Lisbon and to the Working Group in Non-Linear Dynamics in Potsdam, Germany. This work was reviewed in: Esposito, L. W. 2002. Planetary rings. Rep. hog. Phys. 65, 1741-1783. Planetary rings. LASP reprint 874. Online at Dr. Esposito gave presentations at schools and over the internet on the results of this work. Dr. Brooks lectured in undergraduate and graduate classes on Jupiter's rings, and on the meaning of his research. In August 2003, Dr. Shawn Brooks received the Phd degree from the University of Colorado in Astrophysical and Planetary Sciences.

  10. Predator-Prey model for haloes in Saturn's A ring

    NASA Astrophysics Data System (ADS)

    Esposito, Larry W.; Bradley, E. Todd; Colwell, Joshua E.; Madhusudhanan, Prasanna; Sremcevic, Miodrag


    UVIS SOI reflectance spectra show bright 'haloes' around the locations of some of the strongest resonances in Saturn's A ring (Esposito etal 2005). UV spectra constrain the size and composition of the icy ring particles (Bradley etal 2010, 2012). The correspondence of IR, UV spectroscopy, HSP wavelet analysis indicate that we detect the same phenomenon. We investigate the Janus 2:1. 4:3, 5:3, 6:5 and Mimas 5:3 inner Lindblad resonances as well as at the Mimas 5:3 vertical resonance (bending wave location). Models of ring particle regolith evolution (Elliott and Esposito 2010) indicate the deeper regolith is made of older and purer ice. The strong resonances can cause streamline crowding (Lewis and Stewart 2005) which damps the interparticle velocity, allowing temporary clumps to grow, which in turn increase the velocity, eroding the clumps and releasing smaller particles and regolith (see the predator-prey model of Esposito etal 2012). This cyclic behavior, driven by the resonant perturbation from the moon, can yield collision velocities at particular azimuths greater than 1m/sec, sufficient to erode the aggregates (Blum 2006), exposing older, purer materials: In the perturbed region, collisions erode the regolith, removing smaller particles. The released regolith material settles in the less perturbed neighboring regions. Diffusion spreads these ring particles with smaller regolith into a 'halo'. Thus, the radial location of the strongest resonances can be where we find both large aggregates and disrupted fragments, in a balance maintained by the periodic moon forcing. If this stirring exposes older, and purer ice, the velocity threshold for eroding the aggregates can explain why only the strongest Lindblad resonances show haloes. Diffusion can explain the morphology of these haloes, although they are not well-resolved spatially by UVIS.

  11. Majorana's legacy

    NASA Astrophysics Data System (ADS)

    Recami, Erasmo


    I was delighted to read Salvatore Esposito's review (March pp44-45) of A Brilliant Darkness, João Magueijo's book about the Italian physicist Ettore Majorana. As no less a figure than Enrico Fermi regarded Majorana as the brightest theoretical physicist of his time, I was happy to see that Majorana's name is at last becoming famous outside Italy. The fact is that although most commentaries about Majorana's work appear in English, over the past 50 years nearly everyone who has written about Majorana's life has done so in Italian.

  12. A Global Transnational Sunni Caliphate: Realistic or Utopian Vision?

    DTIC Science & Technology


    Oxford University Press ), p. 15. 9 Ibid., p.15. 10 Stephen R. Humphrey’s, “Between Memory and Desire: The Middle East in a Troubled Age”, (University of...Edition 2, (New York Oxford University Press ), p. 2-3. 6 Ibid, p. 2. 7 John L. Esposito, “The Oxford History of Islam”, (Oxford Press), p. 549-51...Mitchell, The society of Muslim Brothers, (New York City: Oxford University Press , 1969), p. 193-194. 15

  13. The new SGR 1550-5418 is the old AXP 1E1547.0-5408

    NASA Astrophysics Data System (ADS)

    Rea, N.; Esposito, P.; Krimm, H. A.; Palmer, D. M.; Mereghetti, S.; Tiengo, A.; Israel, G. L.


    N. Rea (U. Amsterdam), P. Esposito (INAF-IASF, Milan), H. A. Krimm (CRESST/GSFC/USRA), D. M. Palmer (LANL), S. Mereghetti, A. Tiengo (INAF-IASF, Milan), G.L. Israel (INAF-OAR) Swift-BAT triggered today on several Galactic short bursts (Krimm et al. GCN 8311, 8312), which were claimed to come from a new Soft Gamma Repeater SGR 1550-5418. However, given the positional coincidence of this new putative SGR 1550-5418 with the Anomalous X-ray Pulsar (AXP) 1E1547.0-5408 (Gelfand & Gaensler 2007; Camilo et al.

  14. Unmasking Stem/Progenitor Cell Properties in Differentiated Epithelial Cells Using Short-term Transplantation

    DTIC Science & Technology


    Ketterer, K., Berberat, P. O ., Giese, N., Esposito, I., Giese, T., Buchler, M. W. et al. (2004). Indian hedgehog signaling pathway: expression and...expression is required for embryonic hair follicle but not mammary gland development. Dev Biol 264, 153- 65. Mukherjee, S., Frolova , N., Sadlonova, A...CK6+ER+ = 14.2% SMO+ CK6+ = 0% Figure 4 D B A Genotype SMO WT L o g ( E f f i c i e n c y ) -3 -2 -1 0 1 Animal Group 1 2 3 4 5 Primary Mammosphere

  15. Notes on Bricelochlorops Paganelli 2002 (Diptera: Chloropidae), with the description of a new species.


    Riccardi, Paula Raile


    Bricelochlorops is a peculiar genus of Chloropinae because its species possess a swollen pedicel and an enlarged clypeus separated into two parts. According to previous phylogenetic studies, Bricelochlorops is known as the sister group of Psilochlorops and their relationships with the remaining chloropine genera are unclear (Paganelli, 2002; Riccardi & Amorim, 2012). There are two described species of Bricelochlorops, B. peregrinus Paganelli 2002 and B. celutae Carvalho-Filho & Esposito 2010. Both species are from Brazil and they are known only from the holotypes. Here, a further species from Peru is described, expanding the distribution of Bricelochlorops.

  16. Inequalities generalizing the second law of thermodynamics for transitions between nonstationary states.


    Verley, Gatien; Chétrite, Raphaël; Lacoste, David


    We discuss the consequences of a variant of the Hatano-Sasa relation in which a nonstationary distribution is used in place of the usual stationary one. We first show that this nonstationary distribution is related to a difference of traffic between the direct and dual dynamics. With this formalism, we extend the definition of the adiabatic and nonadiabatic entropies introduced by M. Esposito and C. Van den Broeck in Phys. Rev. Lett. 104, 090601 (2010) for the stationary case. We also obtain interesting second-law-like inequalities for transitions between nonstationary states.

  17. The Case for Massive and Ancient Rings of Saturn

    NASA Astrophysics Data System (ADS)

    Esposito, Larry W.


    Analysis of Voyager and Pioneer 11 results give a mass for Saturn's rings, M = 5 x 10-8 Msat. This is about the mass of Saturn's small moon Mimas. This has been interpreted as a lower limit to the ring mass (Esposito et al 1983), since the thickest parts of the rings were not penetrated by the stellar occultstion, and this calculation assumes an unvarying particle size throughout the rings. Because the rings are constantly bombarded by micrometeroids, their current composition of nearly pure water ice implies such low mass rings must have formed recently. The case is particularly strong for Saturn's A ring, where the data are the best, implying the A ring is less than 10% of the age of the Saturn (Esposito 1986). Cassini results compound this problem. UVIS spectra are consistent with either young rings or rings about 10x as massive as the Voyager estimate (Elliott and Esposito (2011). CDA confirms the impacting mass flux is similar to that assumed for the pollution calculations (Kempf etal 2015). VIMS analysis of density wave signatures in the B ring gives a value of about 1/3 the Voyager value (Hedmann etal 2016). This VIMS result implies the rings are even younger! The problem is that young rings are very unlikely to be formed recently, meaning that we live in a very special epoch, following some unlikely recent origin… like disruption of a medium sized moon or capture of the fragments of a disrupted comet (Charnoz etal 2009).To take the VIMS results at face value, Saturn's low mass rings must be very young. The optically thick B ring must be made of small, porous or fractal particles. An alternative is that we accept the higher mass interpretation of the Pioneer 11 results (Esposito etal 2008) using the granola bar model of Colwell etal 2007. This would imply that the density wave structure seen by VIMS is not sensing all the mass in the rings, where structure near strong resonances is dominted by temporary aggregates, and where non-linear effects cause the

  18. Universal efficiency bounds of weak-dissipative thermodynamic cycles at the maximum power output

    NASA Astrophysics Data System (ADS)

    Guo, Juncheng; Wang, Junyi; Wang, Yuan; Chen, Jincan


    Based on the assumption of weak dissipation introduced by Esposito [Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.105.150603 105, 150603 (2010)], analytic expressions for the efficiency bounds of several classes of typical thermodynamic cycles at the maximum power output are derived. The results obtained are of universal significance. They can be used to conveniently reveal the general characteristics of not only Carnot heat engines, but also isothermal chemical engines, non-Carnot heat engines, flux flow engines, gravitational engines, quantum Carnot heat engines, and two-level quantum Carnot engines at the maximum power output and to directly draw many important conclusions in the literature.

  19. A model of late quaternary landscape development in the Delaware Valley, New Jersey and Pennsylvania

    USGS Publications Warehouse

    Ridge, J.C.; Evenson, E.B.; Sevon, W.D.


    In the Delaware Valley of New Jersey and eastern Pennsylvania the late Quaternary history of colluviation, fluvial adjustment, and soil formation is based on the ages of pre-Wisconsinan soils and glacial deposits which are indicated by feld relationships and inferred from mid-latitude climate changes indicated by marine oxygen-isotope records. The area is divided into four terranes characterized by sandstone, gneiss, slate and carbonate rocks. Since the last pre-Wisconsinan glaciation (> 130 ka, inferred to be late Illinoian), each terrane responded differently to chemical and mechanical weathering. During the Sangamon interglacial stage (??? 130-75 ka) in situ weathering is inferred to have occurred at rates greater than transportation of material which resulted in the formation of deep, highly weathered soil and saprolite, and dissolution of carbonate rocks. Cold climatic conditions during the Wisconsinan, on the other hand, induced erosion of the landscape at rates faster than soil development. Upland erosion during the Wisconsinan removed pre-Wisconsinan soil and glacial sediment and bedrock to produce muddy to blocky colluvium, gre??zes lite??es, and alluvial fans on footslopes. Fluvial gravel and overlying colluvium in the Delaware Valley, both buried by late Wisconsinan outwash, are inferred to represent episodes of early and middle Wisconsinan (??? 75-25 ka) upland erosion and river aggradiation followed by river degradation and colluvium deposition. Early-middle Wisconsinan colluvium is more voluminous than later colluvium despite colder, possibly permafrost conditions during the late Wisconsinan ??? 25-10 ka). Extensive colluviation during the early and middle Wisconsinan resulted from a longer (50 kyr), generally cold interval of erosion with a greater availability of easily eroded pre-Wisconsinan surficial materials on uplands than during the late Wisconsinan. After recession of late Wisconsinan ice from its terminal position, soil formation and

  20. Immunitary bioeconomy: the economisation of life in the international cord blood market.


    Brown, Nik; Machin, Laura; McLeod, Danae


    This paper examines an emerging bioeconomy centred on the international banking and trade in cord blood. Since the late 1980s cord blood has been used in an expanding range of treatments and as an alternative to the use of bone marrow stem cells. This is particularly the case in treating ethnic minority populations who have historically been under-represented in bone marrow registries. The paper explores the mobilisation and commercialisation of an increasingly important bioeconomic resource with cord blood units trading internationally at high prices. This is a market mediated through a sophisticated global network of immunologically typed and matched bodily matter in which immunity has become a form of 'corporeal currency'. Based on recent international figures we reflect upon the balance of trade between imports and exports across the world's cord blood bioeconomy. Theoretically, this case is, we suggest, an extension of what Roberto Esposito (2008) has termed an 'immunitary paradigm' in which immunity has become the basis for new forms of bioeconomic flow, circulation and exchange. Esposito (2008). Bios: Biopolitics and Philosophy. Minnesota, MN: University of Minnesota Press.

  1. Effect of cosmological evolution on Solar System constraints and on the scalarization of neutron stars in massless scalar-tensor theories

    NASA Astrophysics Data System (ADS)

    Anderson, David; Yunes, Nicolás; Barausse, Enrico


    Certain scalar-tensor theories of gravity that generalize Jordan-Fierz-Brans-Dicke theory are known to predict nontrivial phenomenology for neutron stars. In these theories, first proposed by Damour and Esposito-Farèse, the scalar field has a standard kinetic term and couples conformally to the matter fields. The weak equivalence principle is therefore satisfied, but scalar effects may arise in strong-field regimes, e.g., allowing for violations of the strong equivalence principle in neutron stars ("spontaneous scalarization") or in sufficiently tight binary neutron-star systems ("dynamical/induced scalarization"). The original scalar-tensor theory proposed by Damour and Esposito-Farèse is in tension with Solar System constraints (for couplings that lead to scalarization), if one accounts for cosmological evolution of the scalar field and no mass term is included in the action. We extend here the conformal coupling of that theory, in order to ascertain if, in this way, Solar System tests can be passed, while retaining a nontrivial phenomenology for neutron stars. We find that, even with this generalized conformal coupling, it is impossible to construct a theory that passes both big bang nucleosynthesis and Solar System constraints, while simultaneously allowing for scalarization in isolated/binary neutron stars.

  2. Mapping Methane in Titan's Atmosphere near Titan's Surface

    NASA Astrophysics Data System (ADS)

    Young, Eliot; Soderblom, Jason; Barnes, Jason


    Titan's atmospheric methane may be coupled to sources and sinks on its surface. In order to map methane concentrations in layers just above Titan's surface, we use data sets in which locations on Titan are imaged from a variety of viewing angles (and within a short time span). We also use a radiative transfer code based on the Markov Chain method of Esposito and House (1978, AJ 219, 1058) to accommodate spherical atmospheric geometries. We report on (a) selected Cassini/VIMS flybys that image terrain on Titan from different angles, (b) the expected vertical resolution of methane maps near the surface from these flybys and (c) preliminary results: 3D methane and haze distributions and surface albedos.

  3. Evolution of regolith depth and fractional pollution of Saturn’s rings

    NASA Astrophysics Data System (ADS)

    Elliott, Joshua Peter; Esposito, Larry W.


    We model the evolution of the fractional pollution of Saturn’s rings, by calculating the ratio of exogenous meteoritic material to endogenous icy material native to the ring system. Comparison to ring spectra can constrain the age of the planet’s ring system. We update our Markov-chain based model (Elliott and Esposito 2011) to numerically calculate the regolith depth and fractional pollution of a simulated system of ring particles for a given input meteoritic mass flux distribution into the system over long time scales. We use new mass flux values recently reported by Kempf et al. (EPSC 2015) derived from the Cassini Cosmic Dust Analyzer (CDA) to calculate new fractional pollution values, and calculate the bidirectional reflectance spectra using reflectance data of comet 67P/Churyumov-Gerasimenko obtained by the Alice UV spectrometer onboard the Rosetta spacecraft as the pollutant, as well as several other pollutant species for comparison to Cassini UVIS spectra.

  4. Venus volcanism and El Chichon

    NASA Astrophysics Data System (ADS)

    Bell, Peter M.

    Reinterpretations of telemetry data returned to earth from the Pioneer Venus Orbiter suggest that the surface of Venus may be characterized by violent immense volcanic activity. L.W. Esposito has made an interactive analysis of Pioneer ultraviolet spectral data and similar data from the earth's atmosphere [Science, 223, 1072-1074, 1984]. Spacecraft analysis of sulfur dioxide in the earth's upper atmosphere, apparently released by El Chich[acu]on, Mexico, in March 1982 (EOS, June 14, 1983, p. 411, and August 16, 1983, p. 506) prompted reanalysis of accumulated Pioneer ultraviolet data. Massive injections of sulfur dioxide into the Venus atmosphere could be the result of volcanic eruptions about the size of the Krakatoa explosive eruption that took place between Java and Summatra in 1883.

  5. The Case for Massive and Ancient Rings of Saturn

    NASA Astrophysics Data System (ADS)

    Esposito, Larry W.


    Analysis of Voyager and Pioneer 11 results give a mass for Saturn's rings, M = 5 x 10-8 Msat. This is about the mass of Saturn's small moon Mimas. This has been interpreted as a lower limit to the ring mass (Esposito et al 1983), since the thickest parts of the rings were not penetrated by the stellar occultstion, and this calculation assumes an unvarying particle size throughout the rings. Because the rings are constantly bombarded by micrometeroids, their current composition of nearly pure water ice implies such low mass rings must have formed recently. The case is par-ticularly strong for Saturn's A ring, where the data are the best, implying the A ring is less than 10% of the age of the Saturn (Esposito 1986). Cassini results com-pound this problem. UVIS spectra are consistent with either young rings or rings about 10x as massive as the Voyager estimate (Elliott and Esposito (2011). CDA confirms the impacting mass flux is similar to that as-sumed for the pollution calculations (Kempf etal 2015). VIMS analysis of density wave signatures in the B ring gives a value of about 1/3 the Voyager value (Hedmann etal 2016). This VIMS result implies the rings are even younger! The problem is that young rings are very unlikely to be formed recently, meaning that we live in a very special epoch, following some unlikely recent origin… like disruption of a medium sized moon or capture of the fragments of a disrupted comet. This paradox (Charnoz etal 2009) is unre-solved. Alternative interpretations: To take the VIMS results at face value, Saturn's low mass rings must be very young. The optically thick B ring must be made of small, porous or fractal particles. This is hard to understand, since the particles are continually colliding every few hours and temporary aggregates will stir the collision velocities to higher values. An alternative is that we accept the higher mass interpretation of the Pioneer 11 results (Esposito etal 2008) using the granola bar model of Colwell

  6. Efficiency and its bounds for thermal engines at maximum power using Newton's law of cooling

    NASA Astrophysics Data System (ADS)

    Yan, H.; Guo, Hao


    We study a thermal engine model for which Newton's cooling law is obeyed during heat transfer processes. The thermal efficiency and its bounds at maximum output power are derived and discussed. This model, though quite simple, can be applied not only to Carnot engines but also to four other types of engines. For the long thermal contact time limit, new bounds, tighter than what were known before, are obtained. In this case, this model can simulate Otto, Joule-Brayton, Diesel, and Atkinson engines. While in the short contact time limit, which corresponds to the Carnot cycle, the same efficiency bounds as that from Esposito [Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.105.150603 105, 150603 (2010)] are derived. In both cases, the thermal efficiency decreases as the ratio between the heat capacities of the working medium during heating and cooling stages increases. This might provide instructions for designing real engines.

  7. Efficiency and its bounds for thermal engines at maximum power using Newton's law of cooling.


    Yan, H; Guo, Hao


    We study a thermal engine model for which Newton's cooling law is obeyed during heat transfer processes. The thermal efficiency and its bounds at maximum output power are derived and discussed. This model, though quite simple, can be applied not only to Carnot engines but also to four other types of engines. For the long thermal contact time limit, new bounds, tighter than what were known before, are obtained. In this case, this model can simulate Otto, Joule-Brayton, Diesel, and Atkinson engines. While in the short contact time limit, which corresponds to the Carnot cycle, the same efficiency bounds as that from Esposito et al. [Phys. Rev. Lett. 105, 150603 (2010)] are derived. In both cases, the thermal efficiency decreases as the ratio between the heat capacities of the working medium during heating and cooling stages increases. This might provide instructions for designing real engines.

  8. Radiation Chemistry of Potential Europa Plumes

    NASA Astrophysics Data System (ADS)

    Gudipati, M. S.; Henderson, B. L.


    Recent detection of atomic hydrogen and atomic oxygen and their correlation to potential water plumes on Europa [Roth, Saur et al. 2014] invoked significant interest in further understanding of these potential/putative plumes on Europa. Unlike on Enceladus, Europa receives significant amount of electron and particle radiation. If the plumes come from trailing hemisphere and in the high radiation flux regions, then it is expected that the plume molecules be subjected to radiation processing. Our interest is to understand to what extent such radiation alterations occur and how they can be correlated to the plume original composition, whether organic or inorganic in nature. We will present laboratory studies [Henderson and Gudipati 2014] involving pulsed infrared laser ablation of ice that generates plumes similar to those observed on Enceladus [Hansen, Esposito et al. 2006; Hansen, Shemansky et al. 2011] and expected to be similar on Europa as a starting point; demonstrating the applicability of laser ablation to simulate plumes of Europa and Enceladus. We will present results from electron irradiation of these plumes to determine how organic and inorganic composition is altered due to radiation. Acknowledgments:This research was enabled through partial funding from NASA funding through Planetary Atmospheres, and the Europa Clipper Pre-Project. B.L.H. acknowledges funding from the NASA Postdoctoral Program for an NPP fellowship. Hansen, C. J., L. Esposito, et al. (2006). "Enceladus' water vapor plume." Science 311(5766): 1422-1425. Hansen, C. J., D. E. Shemansky, et al. (2011). "The composition and structure of the Enceladus plume." Geophysical Research Letters 38. Henderson, B. L. and M. S. Gudipati (2014). "Plume Composition and Evolution in Multicomponent Ices Using Resonant Two-Step Laser Ablation and Ionization Mass Spectrometry." The Journal of Physical Chemistry A 118(29): 5454-5463. Roth, L., J. Saur, et al. (2014). "Transient Water Vapor at Europa's South

  9. The imprint of Gould's belt on the local cosmic ray electron spectrum

    NASA Astrophysics Data System (ADS)

    Pohl, M.; Perrot, C.; Grenier, I.


    In a recent paper Pohl and Esposito (1998) demonstrated that if the sources of cosmic-rays are discrete, as are Supernova Remnants (SNR), then the spectra of cosmic-ray electrons largely vary with location and time and the locally measured electron spectrum may not be representative of the electron spectra elsewhere in the Galaxy, which could be substantially harder than the local one. They have shown that the observed excess of γ-ray emission above 1 GeV can in fact be partially explained as a correspondingly hard inverse Compton component, provided the bulk of cosmic-ray electrons is produced in SNR. As part of a program to model the Galactic γ-ray foreground we have continued the earlier studies by investigating the impact of the star forming region Gould's Belt on the local electron spectrum. If the electron sources in Gould's Belt were continous, the local electron spectrum would be slightly hardened. If the electron sources are discrete, which is the more probable case, the variation in the local electron spectrum found by Pohl & Esposito persists. 1 The local cosmic-ray electron spectrum The recent detections of non-thermal X-ray synchrotron radiation from the supernova remnants SN1006 (Koyama et al., 1995), RX J1713.7-3946 (Koyama et al., 1997), IC443 (Keohane et al., 1997; Slane et al., 1999), Cas A (Allen et al., 1997), and RCW86 (Borkowski et al., 2001) and the subsequent detections of SN1006 (Tanimori et al., 1998), RX J1713.7-3946 (Muraishi et al., 2000), and Cas A (Aharonian et al., 2001) at TeV energies support the hypothesis that at least Galactic cosmic-ray electrons are accelerated predominantly in SNR. The Galactic distribution and spectrum of cosmic-ray electrons are intimately linked to the distribution and nature of their sources. Supernovae and hence their remnants are tran-

  10. UVIS ring occultations show F ring feature location and optical depth correlated with Prometheus

    NASA Astrophysics Data System (ADS)

    Meinke, Bonnie K.; Esposito, L. W.; Albers, N.


    We find 24 statistically significant features in the F ring occultations using the High Speed Photometer (HSP) channel of the Cassini Ultraviolet Imaging Spectrograph (UVIS). These features are likely transient clumps of material embedded in the ring, each of which attenuates stellar signal during an occultation because the ring material is more densely packed at that location. In fact, two of these features are opaque, indicating they may be solid moonlets. Two trends are evident in the azimuthal location of these 24 F ring features with respect to that of Prometheus. First, the orbital locations of these features are mostly opposite Prometheus, as 11 of the 24 occupy the orbital region separated from Prometheus by 180° ± 20°. Second, average feature optical depth is maximum near the antipode of Prometheus in orbit. Our hypothesis is that these results show aggregation and disaggregation of clumps after Prometheus passes by. As Prometheus passes interior to the F ring, it encounters material once every synodic period, 68 days. Optical depth indicates density of ring material along the line of sight, so as material clumps together, we expect to see higher optical depths. Thus we infer that the encounter stimulates clumping of material that reaches a maximum 180° downstream. This may reinforce similar evidence that Ring-Moon interaction stimulates clumping in the F ring region from Cassini imaging (Beurle, et al., 2010) and at the B ring edge (Esposito, et al., 2010). Esposito, et al. (2010) suggest that the combined mass and velocity evolution of the ring system resembles a predator/prey model. This research was supported by the Cassini Project.

  11. On the Decadal Variation of sulfur dioxide at the Cloud Top of Venus

    NASA Astrophysics Data System (ADS)

    Zhang, Xi

    Venus atmosphere is a natural laboratory of sulfur chemistry. As one of the parent species of sulfur, sulfur dioxide (SO_2) is generated in the lower atmosphere and transported upward to the middle atmosphere, where it is further oxidized and eventually produces sulfuric acid cloud. The 30-year observations from the Pioneer Venus (Esposito et al., 1988) and the Venus Express (Marcq et al., 2012) show a decadal variation of total column abundance of SO_2 above the cloud top. The amplitude varies in about two orders of magnitude and therefore poses a question on what causes such a dramatic change on the sulfur budget. Previous interpretations include episodic volcanic eruption (Esposito 1984) and long-time dynamical oscillations (Marcq et al., 2012) that supported by a recent general circulation model on Venus (Parish et al., 2011). Here we attempt to understand the secular variation of SO_2 using a one-dimensional (1D) time-evolving photochemistry-diffusion model which includes about 50 species and about 350 reactions (Zhang et al., 2010; 2011). Specifically for this study, we perturb the mean steady state of the middle atmosphere of Venus by adding forcings at the bottom layer (at about 58 km). Two types of forcing are considered here: (1) the volcanic eruption is simulated by a mass flux injected from the bottom layer; and (2) a wavy structure is provided on the eddy diffusion profile to approximate the dynamical perturbations. Important parameters such as the amplitude and timescale of the forcings are constrained by the observation secular patterns. Possible consequences are discussed and the variations for other species are predicted to guide the future observations. This research was supported by the Bisgrove scholar Program in the University of Arizona.

  12. Reply to Comments on “AGU Statement: Investigation of Scientists and Officials in L'Aquila, Italy, Is Unfounded”

    NASA Astrophysics Data System (ADS)

    McPhaden, Michael


    It is critical to recognize the benefits and limitations of scientific knowledge, particularly when it comes to predicting hazards. I agree with G. J. Wasserburg that AGU should help scientists communicate their work accurately and understandably so it can provide the greatest value to society. This objective is explicit in AGU's new strategic plan ( and is consistent with our vision of both advancing and communicating Earth and space science to ensure a sustainable future. We as a community have an obligation to increase the role of science in informing policy to mitigate the impacts of natural disasters. Such efforts require an open exchange of ideas and information and a clear understanding of the limitations of our knowledge. In response to Flavio Dobran, I agree that scientists are not above the law and, like all citizens, must be held accountable for their actions. However, laws and lawmakers must also recognize what science can and cannot do. We cannot yet reliably predict precisely when earthquakes will occur.

  13. Perezhivanie and classroom discourse: a cultural-historical perspective on "Discourse of design based science classroom activities"

    NASA Astrophysics Data System (ADS)

    Adams, Megan; March, Sue


    Flavio Azevedo, Peggy Martalock and Tugba Keser challenge the `argumentation focus of science lessons' and propose that through a `design-based approach' emergent conversations with the teacher offer possibilities for different types of discussions to enhance pedagogical discourse in science classrooms. This important paper offers a "preliminary contribution to a general theory" regarding the link between activity types and discourse practices. Azevedo, Martalock and Keser offer a general perspective with a sociocultural framing for analysis of classroom discourse. Interestingly the specific concepts drawn upon are from conversation analysis; there are few sociocultural concepts explored in detail. Therefore, in this article we focus on a cultural historical (Vygotsky in The collected works of L. S. Vygotsky. The history and development of higher mental functions, vol 4. Plenum Press, New York, 1987; The Vygotsky reader. Black, Cambridge, 1994) methodology to explore, analyse and explain how we would use a different theoretical lens. We argue that a cultural historical reading of argumentation in science lessons and design based activity will expand Azevedo, Martalock and Keser's proposed general theory of activity types and discourse practices. Specifically, we use Lev Vygotksy's idea of perezhivanie as the unit of analysis to reconceptualise this important paper. We focus on the holistic category of students' emotional experience through discourse while developing scientific awareness.

  14. Cooling and Trapping of Atomic Calcium

    NASA Astrophysics Data System (ADS)

    Nogueira, Giovana; Cavasso-Filho, Reinaldo; Magno, Wictor; Ortega, Davi; Manoel, Daniela; Figueira, David; Diogenes, Luciana; Pereira, Daniel; Cruz, Flavio


    Cooling and Trapping of Atomic Calcium Giovana T. Nogueira, Reinaldo L. Cavasso-Filho, Wictor C. Magno, Davi R. Ortega, Daniela A. Manoel, David L. Figueira, Luciana C.M.F.Diogenes, Daniel Pereira, and Flavio C. Cruz Instituto de Física ``Gleb Wataghin'', Universidade Estadual de Campinas, CP.6165, Campinas, SP, 13083-970, Brazil We present our recent results on atomic beam deceleration and magneto-optical trapping of atomic Calcium, using its ^1S_0-^1P1 transition at 423 nm. In order to avoid any perturbation to the atomic cloud, we employed a slower laser beam tightly focused near the on-axis MOT. This allowed us to detect cold collisions trap losses, which contribute to only 3% of the total losses, by comparing trap load and decay curves. We also analyze the theoretical possibility of Doppler cooling using the two-photon (4s^2)^1S0 - (4s5s)^1S0 transition, excited in near resonance with the ^1P1 level by laser beams at 423 and 1034 nm. An equilibrium temperature limit of 123 microKelvin is obtained. This scheme should be used as a second cooling stage, allowing 100% transfer efficiency for atoms pre-cooled with the 423-nm transition. Finally we report our progress towards the development of an optical clock based on the ^1S0 -^3P1 intercombination transition at 657 nm.

  15. Scaling behavior and a Markov model for ventricular fibrillation generated by ectopic beats

    NASA Astrophysics Data System (ADS)

    Hastings, Harold; Evans, Steven; Zaharakis, Alex; Hilaire, Christian


    Sudden cardiac death is a major cause of death in the industrialized world, responsible for 300,000 deaths per year in the US. Although the cardiac electrical system normally produces one ventricular activation in response to each stimulus from the sinus node, ``spontaneous'' activations, called premature ventricular contractions (PVCs), can arise in the ventricles themselves, and propagate through the ventricles. Although usually harmless in the absence of underlying disease, PVCs can generate broken wavefronts when they meet gradients of refractoriness generated by other beats. These broken wavefronts may generate spiral waves producing ventricular tachycardia and ultimately degenerate into ventricular fibrillation (VF), causing sudden cardiac death. When does a PVC lead to ventricular fibrillation ? This is a stiff problem, involving time scales from milliseconds to many years. We overcome this problem by developing universal scaling properties and using these rules to drive a Markov process. We find two significant ``amplifiers'' and discuss consequences for variability of VF rates in human populations. We thank Elizabeth Cherry, Flavio Fenton, Anna Gelzer and James Glimm for helpful discussions.

  16. A cultural historical theoretical perspective of discourse and design in the science classroom

    NASA Astrophysics Data System (ADS)

    Adams, Megan


    Flavio Azevedo, Peggy Martalock and Tugba Keser have initiated an important conversation in science education as they use sociocultural theory to introduce design based scenarios into the science classroom. This response seeks to expand Azevedo, Martalock and Keser's article The discourse of design- based science classroom activities by using a specific perspective within a sociocultural framework. Through using a cultural historical (Vygotsky in The history and development of higher mental functions, Plenum Press, New York, 1987) reading of design based activity and discourse in the science classroom, it is proposed that learning should be an integral part of these processes. Therefore, everyday and scientific concepts are explained and expanded in relation to Inventing Graphing and discourse presented in Azevedo, Martalock and Keser's article. This response reports on the importance of teacher's being explicit in relation to connecting everyday and scientific concepts alongside design based activity and related science concepts when teaching students. It is argued that explicit teaching of concepts should be instigated prior to analysis of discourse in the science classroom as it is only with experience and understanding these processes that students have the resources to call upon to argue like practicing scientists.

  17. Cassini UVIS Observations Show Active Saturn's Rings

    NASA Astrophysics Data System (ADS)

    Esposito, L.; Colwell, J. E.; UVIS Team


    The Cassini Ultraviolet Imaging Spectrograph (UVIS) is part of the remote sensing payload of the NASA/ESA Cassini spacecraft. This spectrograph includes channels for extreme UV and far UV spectroscopic imaging, high speed photometry of stellar occultations, solar EUV occultation, and a hydrogen/deuterium absorption cell. We report our initial results from UVIS observations of Saturn's rings. Dynamic interactions between neutrals, ions, rings, moons and meteoroids produce a highly structured and time variable Saturn system Oxygen in the Saturn system dominates the magnetosphere. Observed fluctuations indicate close interactions with plasma sources. Stochastic events in the E ring may be the ultimate source. The spectral signature of water ice is seen on Phoebe and in Saturn's rings. Water ice is mixed non-uniformly with darker constituents. The high structure of the UV ring reflectance argues that collisional transport dominates ballistic transport in darkening the rings. Our preliminary results support the idea that rings are recycled fragments of moons: the current processes are more important than history and initial conditions. The spectra along the UVIS SOI radial scan indicate varying amounts of water ice. In the A ring, the ice fraction increases outward to a maximum at the outer edge. This large-scale variation is consistent with initially pure ice that has suffered meteoritic bombardment over the age of the Solar system (Cuzzi and Estrada 1998). We also see variations over scales of 1000 - 3000 km, which cannot be explained by this mechanism. Ballistic transport of spectrally neutral extrinsic pollutants from meteoroids striking the rings has a typical throw distance of 6000 km (Durisen et al 1989), too long to explain this finer structure. We propose a class of smaller renewal events, in which a small moon residing within the rings is shattered by an external impactor (Colwell and Esposito 1993, Barbara and Esposito 2002, Esposito and Colwell 2003). The

  18. Accretion in Saturn's F Ring

    NASA Astrophysics Data System (ADS)

    Meinke, B. K.; Esposito, L. W.; Stewart, G.


    Saturn's F ring is the solar system's principal natural laboratory for direct observation of accretion and disruption processes. The ring resides in the Roche zone, where tidal disruption competes with self-gravity, which allows us to observe the lifecycle of moonlets. Just as nearby moons create structure at the B ring edge (Esposito et al. 2012) and the Keeler gap (Murray 2007), the F ring "shepherding" moons Prometheus and Pandora stir up ring material and create observably changing structures on timescales of days to decades. In fact, Beurle et al (2010) show that Prometheus makes it possible for "distended, yet gravitationally coherent clumps" to form in the F ring, and Barbara and Esposito (2002) predicted a population of ~1 km bodies in the ring. In addition to the observations over the last three decades, the Cassini Ultraviolet Imaging Spectrograph (UVIS) has detected 27 statistically significant features in 101 occultations by Saturn's F ring since July 2004. Seventeen of those 27 features are associated with clumps of ring material. Two features are opaque in occultation, which makes them candidates for solid objects, which we refer to as Moonlets. The 15 other features partially block stellar signal for 22 m to just over 3.7 km along the radial expanse of the occultation. Upon visual inspection of the occultation profile, these features resemble Icicles, thus we will refer to them as such here. The density enhancements responsible for such signal attenuations are likely due to transient clumping of material, evidence that aggregations of material are ubiquitous in the F ring. Our lengthy observing campaign reveals that Icicles are likely transient clumps, while Moonlets are possible solid objects. Optical depth is an indicator of clumping because more-densely aggregated material blocks more light; therefore, it is natural to imagine moonlets as later evolutionary stage of icicle, when looser clumps of material compact to form a feature that appears

  19. Dependence on radiation quality of DNA fragmentation spectra

    NASA Astrophysics Data System (ADS)

    Campa, Alessandro; Ottolenghi, Andrea; Alloni, Daniele; Ballarini, Francesca; Belli, Mauro; Esposito, Giuseppe; Facoetti, Angelica; Friedland, Werner; Liotta, Marco; Paretzke, Herwig

    (Relative Biological Effectiveness) of high LET radiation. This work was partially supported by EU ("RISC-RAD" project, Contract no. FI6R-CT 2003- 508842, and "NOTE" project, Contract no. FI6R-036465) and ASI (Italian Space Agency, "Mo-Ma/COUNT" project). References A. Campa, F. Ballarini, M. Belli, R. Cherubini, V. Dini, G. Esposito, W.Friedland, S. Gerardi, S. Molinelli, A. Ottolenghi, H. G. Paretzke, G. Simone and M. A. Tabocchini. DNA DSB induced in human cells by charged particles and gamma rays: experimental results and theoretical approaches. Int. J. Radiat.Biol. 81, 841-854 (2005). D. Alloni, F. Ballarini, M. Belli, A. Campa, G. Esposito, W. Friedland, M.Liotta, A. Ottolenghi and H. G. Paretzke. Modeling of DNA fragmentation induced in human fibroblasts by 56 Fe ions. Adv. Space Res. 40, 1401-1407 (2007a). D. Alloni, F. Antonelli, F. Ballarini, M. Belli, A. Campa, V. Dini, G.Esposito, W. Friedland, M. Liotta, A. Ottolenghi, H. G. Paretzke, G. Simone, E. Sorrentino and M. A. Tabocchini. Small DNA fragments induced in human fibroblasts by 56 Fe ions: experimental data and MC simulations. Proc. "Ion Beams in biology and medicine", Heidelberg, 26-29 September 2007, edited by J. Debus, K. Henrichs, G. Kraft, p. 164 (2207b).

  20. Prefazione al quarto volume di GERBERTVS

    NASA Astrophysics Data System (ADS)

    Sigismondi, Costantino

    The fourth volume of GERBERTVS contains the acts of the symposia held in Rome, at the Odeion hall of Lettere faculty in Sapienza University on December 7, 2012 Gerbert Homo Novus and on March 13, 2013 on the pre and post humanistic figures. Laura C. Paladino presents the didactical activity of Gerbert as from Richer of Reims who completed his Historia Francorum in 998, before the election of Gerbert to the pontifical soil. Among these activities there is the teaching of astronomy and mathematics and the abacus, to which a special article of Jorge Nuno Silva is dedicated. The abacus increased dramatically the rapidity of the computations and some algoritms thaught by Gerbert and reported by his former student Bernelinus is very reliably invented by Gerbert himself, as Silva demostrates in his paper. Giancarlo Pani presents the relation between Galileo and Kepler, at the end of the humanistic period, showing interesting insights on the rather asymmetrical exchange of information between the two greater astronomer of 1600. Veronica Regoli presents the Cosmos of Dante, the ideal structure of the Divine Comedy. Patrick Demouy presents the new biography of Flavio G. Nuvolone where the great novelty is the noble origin of Gerbert from Carlat family, but before the marriage of his (presumed) father. His birth is shifted back to 938 with technical demostrations. Paolo Zanna compares the magisterium of Gerbert-Sylvester II and that one of John Paul II and pope Francesco. Finally C. Sigismondi presents the work and the activities of Pawel Max Maksym (1983-2013) who founded the Observatory &"Pope Sylvester II" in the town of Bukowiec, near Lodz, Poland.

  1. Cyclin D1 down-regulation is essential for DBC2's tumor suppressor function

    SciTech Connect

    Yoshihara, Takashi; Collado, Denise; Hamaguchi, Masaaki . E-mail:


    The expression of tumor suppressor gene DBC2 causes certain breast cancer cells to stop growing [M. Hamaguchi, J.L. Meth, C. Von Klitzing, W. Wei, D. Esposito, L. Rodgers, T. Walsh, P. Welcsh, M.C. King, M.H. Wigler, DBC2, a candidate for a tumor suppressor gene involved in breast cancer, Proc. Natl. Acad. Sci. USA 99 (2002) 13647-13652]. Recently, DBC2 was found to participate in diverse cellular functions such as protein transport, cytoskeleton regulation, apoptosis, and cell cycle control [V. Siripurapu, J.L. Meth, N. Kobayashi, M. Hamaguchi, DBC2 significantly influences cell cycle, apoptosis, cytoskeleton, and membrane trafficking pathways. J. Mol. Biol. 346 (2005) 83-89]. Its tumor suppression mechanism, however, remains unclear. In this paper, we demonstrate that DBC2 suppresses breast cancer proliferation through down-regulation of Cyclin D1 (CCND1). Additionally, the constitutional overexpression of CCND1 prevented the negative impact of DBC2 expression on their growth. Under a CCND1 promoter, the expression of CCNE1 exhibited the same protective effect. Our results indicate that the down-regulation of CCND1 is an essential step for DBC2's growth suppression of cancer cells. We believe that this discovery contributes to a better understanding of DBC2's tumor suppressor function.

  2. Spontaneous Scalarization: Dead or Alive?

    NASA Astrophysics Data System (ADS)

    Berti, Emanuele; Crispino, Luis; Gerosa, Davide; Gualtieri, Leonardo; Horbatsch, Michael; Macedo, Caio; Okada da Silva, Hector; Pani, Paolo; Sotani, Hajime; Sperhake, Ulrich


    In 1993, Damour and Esposito-Farese showed that a wide class of scalar-tensor theories can pass weak-field gravitational tests and exhibit nonperturbative strong-field deviations away from General Relativity in systems involving neutron stars. These deviations are possible in the presence of ``spontaneous scalarization,'' a phase transition similar in nature to spontaneous magnetization in ferromagnets. More than twenty years after the original proposal, binary pulsar experiments have severely constrained the possibility of spontaneous scalarization occurring in nature. I will show that these experimental constraints have important implications for the torsional oscillation frequencies of neutron stars and for the so-called ``I-Love-Q'' relations in scalar-tensor theories. I will also argue that there is still hope to observe strong scalarization effects, despite the strong experimental bounds on the original mechanism. In particular, I will discuss two mechanisms that could produce strong scalarization in neutron stars: anisotropy and multiscalarization. This work was supported by NSF CAREER Award PHY-1055103.

  3. DBC2 resistance is achieved by enhancing 26S proteasome-mediated protein degradation.


    Collado, Denise; Yoshihara, Takashi; Hamaguchi, Masaaki


    Tumor suppressor gene DBC2 stops growth of tumor cells through regulation of CCND1. Interference of CCND1 down-regulation prevented growth arrest caused by DBC2 [T. Yoshihara, D. Collado, M. Hamaguchi, Cyclin D1 down-regulation is essential for DBC2's tumor suppressor function, Biochemical and biophysical research communications 358 (2007) 1076-1079]. It was also noted that DBC2 resistant cells eventually arose after repeated induction of DBC2 with muristerone A treatment [M. Hamaguchi, J.L. Meth, C. Von Klitzing, W. Wei, D. Esposito, L. Rodgers, T. Walsh, P. Welcsh, M.C. King, M.H. Wigler, DBC2, a candidate for a tumor suppressor gene involved in breast cancer, Proc. Natl. Acad. Sci. USA 99 (2002) 13647-13652]. In order to elucidate the mechanism of resistance acquisition, we analyzed DBC2 sensitive and resistant cells derived from the same progenitor cells (T-47D). We discovered that DBC2 protein was abundantly expressed in the sensitive cells when DBC2 was induced. In contrast, it was undetectable by western blot analysis in the resistant cells. We confirmed that the inducible gene expression system was responsive in both cells by detecting induced GFP. Additionally, inhibition of 26S proteasome by MG132 revealed production of DBC2 protein in the resistant cells. These findings indicate that the resistant T-47D cells survive DBC2 induction by rapid destruction of DBC2 through 26S proteasome-mediated protein degradation.

  4. International Ultraviolet Explorer observations of Venus SO sub 2 and SO

    SciTech Connect

    Na, Chan Y.; Esposito, L.W.; Skinner, T.E. )


    Results of recent International Ultraviolet Explorer (IUE) observations of Venus made on January 20, 1987, and April 2 and 3, 1988, along with a reanalysis of the 1979 observations (Conway et al., 1979) are presented. The observations indicate that the amount of sulfur dioxide at the cloud tops of Venus declined by a factor of 8 {plus minus} 4 from 3809 {plus minus} 70 ppb in 1987 and 1988. These values are consistent with the Pioneer Venus results (L.W. Esposito, A recalibration of the solar flux for Pioneer Venus results and a comparison of existing SO{sub 2} measurements on Venus, unpublished manuscript, 1989). The authors identify absorption features of sulfur monoxide for the first time, and estimate the SO mixing ratio above the cloud level is 20 {plus minus} 10 ppb for 1979. This is consistent with photochemical models by Winick and Stewart (1980) and Yung and DeMore (1982) and with the upper limit from Wilson et al. (1981).

  5. On the origin of south polar folds on Enceladus

    NASA Astrophysics Data System (ADS)

    Barr, Amy C.; Preuss, Lauren J.


    Recent high-resolution Cassini images of the south polar terrain of Enceladus reveal regions of short-wavelength deformation, inferred to be compressional folds between the Baghdad and Damascus tiger stripes (Spencer, J.R., Barr, A.C., Esposito, L.W., Helfenstein, P., Ingersoll, A.P., Jaumann, R., McKay, C.P., Nimmo, F., Waite, J.H. [2009a]. Enceladus: An active cryovolcanic satellite. In: Saturn after Cassini-Huygens. Springer, New York, pp. 683-722). Here, we use Fourier analysis of the bright/dark variations to show that the folds have a dominant wavelength of 1.1 ± 0.4 km. We use the simple model of lava flow folding from Fink (Fink, J. [1980]. Geology 8, 250-254) to show that the folds could form in an ice shell with an upper high-viscosity boundary layer of thickness <400 m, with a driving stress of 40-80 kPa, and strain rate between 10 -14 s -1 and 10 -12 s -1. Such deformation rates imply resurfacing of the SPT in 0.05-5 Myr, consistent with its estimated surface age. Measurements of fold topography and more sophisticated numerical modeling can narrow down the conditions of fold formation and provide valuable constraints on the thermal structure of the ice shell on Enceladus.

  6. Off to a Good Start: The Early Development of the Neural Substrates Underlying Visual Working Memory

    PubMed Central

    Fitch, Allison; Smith, Hayley; Guillory, Sylvia B.; Kaldy, Zsuzsa


    Current neuroscientific models describe the functional neural architecture of visual working memory (VWM) as an interaction of the frontal-parietal control network and more posterior areas in the ventral visual stream (Jonides et al., 2008; D'Esposito and Postle, 2015; Eriksson et al., 2015). These models are primarily based on adult neuroimaging studies. However, VWM undergoes significant development in infancy and early childhood, and the goal of this mini-review is to examine how recent findings from neuroscientific studies of early VWM development can be reconciled with this model. We surveyed 29 recent empirical reports that present neuroimaging findings in infants, toddlers, and preschoolers (using EEG, fNIRS, rs-fMRI) and neonatal lesion studies in non-human primates. We conclude that (1) both the frontal-parietal control network and the posterior cortical storage areas are active from early infancy; (2) this system undergoes focalization and some reorganization during early development; (3) and the MTL plays a significant role in this process as well. Motivated by both theoretical and methodological considerations, we offer some recommendations for future directions for the field. PMID:27587999

  7. Weighted reciprocal of temperature, weighted thermal flux, and their applications in finite-time thermodynamics.


    Sheng, Shiqi; Tu, Z C


    The concepts of weighted reciprocal of temperature and weighted thermal flux are proposed for a heat engine operating between two heat baths and outputting mechanical work. With the aid of these two concepts, the generalized thermodynamic fluxes and forces can be expressed in a consistent way within the framework of irreversible thermodynamics. Then the efficiency at maximum power output for a heat engine, one of key topics in finite-time thermodynamics, is investigated on the basis of a generic model under the tight-coupling condition. The corresponding results have the same forms as those of low-dissipation heat engines [ M. Esposito, R. Kawai, K. Lindenberg and C. Van den Broeck Phys. Rev. Lett. 105 150603 (2010)]. The mappings from two kinds of typical heat engines, such as the low-dissipation heat engine and the Feynman ratchet, into the present generic model are constructed. The universal efficiency at maximum power output up to the quadratic order is found to be valid for a heat engine coupled symmetrically and tightly with two baths. The concepts of weighted reciprocal of temperature and weighted thermal flux are also transplanted to the optimization of refrigerators.

  8. Mechanisms of hierarchical reinforcement learning in cortico-striatal circuits 2: evidence from fMRI.


    Badre, David; Frank, Michael J


    The frontal lobes may be organized hierarchically such that more rostral frontal regions modulate cognitive control operations in caudal regions. In our companion paper (Frank MJ, Badre D. 2011. Mechanisms of hierarchical reinforcement learning in corticostriatal circuits I: computational analysis. 22:509-526), we provide novel neural circuit and algorithmic models of hierarchical cognitive control in cortico-striatal circuits. Here, we test key model predictions using functional magnetic resonance imaging (fMRI). Our neural circuit model proposes that contextual representations in rostral frontal cortex influence the striatal gating of contextual representations in caudal frontal cortex. Reinforcement learning operates at each level, such that the system adaptively learns to gate higher order contextual information into rostral regions. Our algorithmic Bayesian "mixture of experts" model captures the key computations of this neural model and provides trial-by-trial estimates of the learner's latent hypothesis states. In the present paper, we used these quantitative estimates to reanalyze fMRI data from a hierarchical reinforcement learning task reported in Badre D, Kayser AS, D'Esposito M. 2010. Frontal cortex and the discovery of abstract action rules. Neuron. 66:315--326. Results validate key predictions of the models and provide evidence for an individual cortico-striatal circuit for reinforcement learning of hierarchical structure at a specific level of policy abstraction. These findings are initially consistent with the proposal that hierarchical control in frontal cortex may emerge from interactions among nested cortico-striatal circuits at different levels of abstraction.

  9. Universality of energy conversion efficiency for optimal tight-coupling heat engines and refrigerators

    NASA Astrophysics Data System (ADS)

    Sheng, Shiqi; Tu, Z. C.


    A unified χ-criterion for heat devices (including heat engines and refrigerators), which is defined as the product of the energy conversion efficiency and the heat absorbed per unit time by the working substance (de Tomás et al 2012 Phys. Rev. E 85 010104), is optimized for tight-coupling heat engines and refrigerators operating between two heat baths at temperatures Tc and Th( > Tc). By taking a new convention on the thermodynamic flux related to the heat transfer between two baths, we find that for a refrigerator tightly and symmetrically coupled with two heat baths, the coefficient of performance (i.e., the energy conversion efficiency of refrigerators) at maximum χ asymptotically approaches \\sqrt{\\varepsilon _C} when the relative temperature difference between two heat baths \\varepsilon _C^{-1}\\equiv (T_h-T_c)/T_c is sufficiently small. Correspondingly, the efficiency at maximum χ (equivalent to maximum power) for a heat engine tightly and symmetrically coupled with two heat baths is proved to be \\eta _C/2+\\eta _C^2/8 up to the second order term of ηC ≡ (Th - Tc)/Th, which reverts to the universal efficiency at maximum power for tight-coupling heat engines operating between two heat baths at small temperature difference in the presence of left-right symmetry (Esposito et al 2009 Phys. Rev. Lett. 102 130602).

  10. Working memory and new learning following pediatric traumatic brain injury.


    Mandalis, Anna; Kinsella, Glynda; Ong, Ben; Anderson, Vicki


    Working memory (WM), the ability to monitor, process and maintain task relevant information on-line to respond to immediate environmental demands, is controlled by frontal systems (D'Esposito et al., 2006), which are particularly vulnerable to damage from a traumatic brain injury (TBI). This study employed the adult-based Working Memory model of Baddeley and Hitch (1974) to examine the relationship between working memory function and new verbal learning in children with TBI. A cross-sectional sample of 36 school-aged children with a moderate to severe TBI was compared to age-matched healthy Controls on a series of tasks assessing working memory subsystems: the Phonological Loop (PL) and Central Executive (CE). The TBI group performed significantly more poorly than Controls on the PL measure and the majority of CE tasks. On new learning tasks, the TBI group consistently produced fewer words than Controls across the learning and delayed recall phases. Results revealed impaired PL function related to poor encoding and acquisition on a new verbal learning task in the TBI group. CE retrieval deficits in the TBI group contributed to general memory dysfunction in acquisition, retrieval and recognition memory. These results suggest that the nature of learning and memory deficits in children with TBI is related to working memory impairment.

  11. DNA fragmentation pattern in human fibroblasts after irradiation with iron ions

    NASA Astrophysics Data System (ADS)

    Campa, Alessandro

    In this work we studied the fragmentation pattern produced by the double stand breaks (DSB) induced in AG1522 primary human fibroblasts by two different iron beams, one of energy 414 MeV/u, and the other of energy 115 MeV/u (with dose-average LET in water equal to 202 keV/µm and 442 keV/µm, respectively). Irradiation with several doses up to 200 Gy was performed at the HIMAC facility of the National Institute of Radiological Sciences, Chiba, Japan. Experimental data, first obtained for fragments belonging to the size ranges 23-1000 kbp and 1000-5700 kbp (Belli et al., 2006), have successively been obtained also for fragments belonging to the size ranges 1-9 kbp and 9-23 kbp; the experimental analysis was performed with pulsed and constant field electrophoresis. The RBE for DSB production was evaluated in two different fragment size ranges (i.e., 23-5700 kbp and 1-5700 kbp), and it was found larger for the wider size range, especially for the beam with the higher LET. The experimental results have been compared to those computed on the basis of the Monte Carlo PARTRAC simulation code, following the line of research started in Campa et al. (2005), and exploiting the recent update of the PARTRAC code to ions heavier than helium (Friedland et al., 2006). Because the agreement has been found satisfactory for both radiation qualities, the spectra outside the experimentally observable fragment size range were also computed in order to evaluate the overall fragmentation pattern. The marked increases of the RBEs for DSB production, obtained when also the very small fragments (< 1 kbp) are included, makes them closer to the RBE values observed for the late cellular effects. This finding is a further indication for the biological significance of the spatial correlation of DSB at short distances. This work was partially supported by ASI (Italian Space Agency, "Mo-Ma/COUNT" project). References M. Belli, A. Campa, V. Dini, G. Esposito, Y. Furusawa, G. Simone, E. Sorrentino

  12. Constraining the Location and Dimensions of Mass Anomalies on Mercury from Mariner 10 Doppler Data

    NASA Astrophysics Data System (ADS)

    Anderson, J. D.; Palguta, J.; Schubert, G.


    Analysis of radio Doppler data generated by the Deep Space Network with Mariner 10 during its first and third encounters with Mercury yielded a quadrupole gravitational field with J2 equal to 6.0 ± 2.0 and C22 equal to 1.0 ± 0.5 in units of 10-5 (Anderson et al., Icarus 71, 337, 1987) . However, this underlying global field leaves systematic Doppler residuals for the third encounter (Esposito et al., COSPAR: Space Res. 17, 639, 1978), residuals that are most likely caused by a large gravity anomaly in the region of closest approach to Mercury at latitude 67.96° and east longitude 53.09°. We report here a detailed characterization of the likely sources producing the putative gravity anomaly. The recovered Doppler residuals and ground track from Esposito et al. (1978) are fit by a model that includes the spacecraft's six trajectory initial conditions along with Mercury's mass GM = 22,032.09 ± 0.91 km3 s-2 (Anderson et al., 1987) and the two quadrupole coefficients. After convergence to the best-fit trajectory, any remaining residuals represent an unmodeled signal that is assumed to arise from anomalous mass concentrations on Mercury plus noise. In order to reduce the noise evident in the Doppler residuals, we smooth them with a variable-width Gaussian filter (Palguta et al., Icarus 180, 428, 2006). The filter width in the time domain increases with the spacecraft altitude, reducing the noise before and after closest approach. Accelerations along the line of sight (LOS) are calculated by sampling the differentiated Doppler smoothing curve at a 10-second time interval, the sample interval for the Doppler frequency data. Multiple spherical-cap disk models are then used to fit the LOS acceleration data. The spherical-cap disk models not only provide the locations and magnitudes of anomalous mass concentrations on Mercury, but also their vertical and horizontal dimensions. We find that a minimum of four mass anomalies on or near Mercury's surface is required to

  13. A Few Highlights from Venus Monitoring Camera on Venus Express

    NASA Astrophysics Data System (ADS)

    Markiewicz, Wojciech J.; Titov, D.; Keller, H.; Moissl, R.; Limaye, S.; Ignatiev, N.; Jaumann, R.; Michalik, H.; Thomas, N.


    Venus is completely covered by a thick cloud layer whose upper part is composed of sulfuric acid and some unknown aerosols(1). The cloud tops are in fast retrograde rotation (super-rotation), but what is driving this super-rotation is unknown(2). Here we report observations of Venus with the Venus Monitoring Camera3 (VMC) on board the Venus Express spacecraft. Taking advantage of the VMC high resolution imaging and the polar orbit we investigate both global and small scale properties of these clouds, their temporal and latitudinal variations, and derive wind velocities. The Southern polar region is highly variable and can change dramatically on time scales as short as one day, perhaps arising from the injection of SO2 into the mesosphere. The convective cells in the vicinity of the sub-solar point are much smaller than previously inferred(4,5,6), which we interpret as indicating that they are confined to the upper cloud layer, contrary to previous conclusions(7,8), but consistent with more recent study(9). We will also report on surface observations with VMC. (1) Esposito, L.W. et al., in Venus, pp. 484-564, 1983, (2) Limaye, S. S., 2007, J. Geophys. Res., 112, 2007, (3) Markiewicz, W.J. et al., Planet. Space Sci., 55, 1701-1711, 2007, (4) Murray, B.C., et al., Science 183, 1307-1315 (1974), (5) Rossow, W.B. et al., J. Geophys. Res. 85, 8107-8128, 1980, (6) Covey, C.C. and G. Schubert, Nature, 290, 17-20, 1981, (7) Baker II, R.D. and G. Schubert, Nature, 355, 710-712, 1992, (8) Belton, M.J.S. et al., J. Atmos. Sci.. 33, 1394-1417, 1976, (9) Baker, R.D., G. Schubert, and P.W. Jones, J. Geophy. Res., 104, Issue E2, p. 3815-3832, 1999.

  14. Morphology and dynamics of the Venus upper cloud layer

    NASA Astrophysics Data System (ADS)

    Markiewicz, Wojciech; Titov, Dmitri; Limaye, Sanjay; Moissl, Richard; Ignatiev, Nikolay; Basilevsky, A. T.; Shalygin, E. V.; Kreslavsky, M. A.; Khatuntsev, Igor; Keller, Horst Uwe; Jaumann, Ralf; Thomas, Nicolas; Michalik, Harald

    Venus is completely covered by a thick cloud layer whose upper part is composed of sulfuric acid and some unknown aerosols1. The cloud tops are in fast retrograde rotation (super-rotation), but what is driving this super-rotation is unknown2. Here we report observations of Venus with the Venus Monitoring Camera3 (VMC) on board the Venus Express spacecraft. Taking advantage of the VMC high resolution imaging and the polar orbit we investigate both global and small scale properties of these clouds, their temporal and latitudinal variations, and derive wind velocities. The Southern polar region is highly variable and can change dramatically on time scales as short as one day, perhaps arising from the injection of SO2 into the mesosphere. The convective cells in the vicinity of the sub-solar point are much smaller than previously inferred4,5,6, which we interpret as indicating that they are confined to the upper cloud layer, contrary to previous conclusions7,8, but consistent with more recent study9. (1) Esposito, L.W. et al., in Venus, pp. 484-564, 1983, (2) Limaye, S. S., 2007, J. Geophys. Res., 112, 2007, (3) Markiewicz, W.J. et al., Planet. Space Sci., 55, 1701-1711, 2007, (4) Murray, B.C., et al., Science 183, 1307-1315 (1974), (5) Rossow, W.B. et al., J. Geophys. Res. 85, 8107-8128, 1980, (6) Covey, C.C. and G. Schubert, Nature, 290, 17-20, 1981, (7) Baker II, R.D. and G. Schubert, Nature, 355, 710-712, 1992, (8) Belton, M.J.S. et al., J. Atmos. Sci.. 33, 1394-1417, 1976, (9) Baker, R.D., G. Schubert, and P.W. Jones, J. Geophy. Res., 104, Issue E2, p. 3815-3832, 1999.

  15. Stochastic events may lead to accretion in Saturn's rings

    NASA Astrophysics Data System (ADS)

    Esposito, Larry W.

    Stochastic events may lead to accretion in Saturn's rings Larry W. Esposito LASP, University of Colorado UVIS occultations indicate accretion is triggered at the B ring edge, in strong density waves in ring A and in the F ring. Moons may trigger accretion by streamline crowding (Lewis & Stewart); which enhances collisions, leading to accretion; increasing random velocities; leading to more collisions and more accretion. Cassini occultations of these strongly perturbed locations show not only accretion but also disaggregation, with time scales of hours to weeks. The collisions may lead to temporary aggregations via stochastic events: collisions can compress unconsolidated objects, trigger adhesion or bring small pieces into contact with larger or higher-density seeds. Disaggregation then can follow from disruptive collisions or tidal shedding. In the accretion/disruption balance, increased random motions could eventually give the upper hand to disruption. . . just as `irrational exuberance' can lead to financial panic in the economy; or the overpopulation of hares can lead to boom-and-bust in the population of foxes. I present a simple predator-prey model. This system's unstable equilibrium can similarly give rise to episodic cycles in accretion: explaining why the observable ring features that indicate embedded objects have been increasing since the beginning of Cassini's observations of Saturn in 2004. Unlike other interpretations of the peculiar events seen near Saturn Equinox, I emphasize the kinetic description of particle interactions rather than a fluid instability approach; and the dominance of stochastic events involving individual aggregates over free and/or driven modes in a flat disk.

  16. Numerical investigation of microbially induced calcite precipitation as a leakage mitigation technology

    NASA Astrophysics Data System (ADS)

    Hommel, Johannes; Cunningham, Alfred; Helmig, Rainer; Ebigbo, Anozie; Class, Holger


    One of the key issues of carbon capture and storage (CCS) is the long term security of the storage site, i.e. the permanent enclosure of the stored carbon dioxide (CO2) in the target reservoir. Amongst the different storage mechanisms, cap rock integrity is crucial for preventing leakage of CO2. Leakage to shallower regions or back to the atmosphere would reduce the efficiency and pose a threat to the environment, for example to groundwater resources or human residence areas. Ureolysis-driven microbially induced calcite precipitation (MICP) is one of the technologies in the current focus of research aiming at mitigation of potential leakage by sealing high permeability zones in cap rocks. In our current work, a numerical model has been developed and validated using MICP experiments in sand filled columns under atmospheric pressure conditions [1]. Based on new experimental data under reservoir pressure conditions in sandstone rock cores [2] the model will be improved and optimized. The focus is on extending the model to 3-D radial flow and the validation of the model under conditions relevant for field scale CCS. The improved numerical model will be used to design field scale MICP experiments and evaluate the results of those experiments to get a better understanding of the potential of MICP as a sealing technology. [1] Ebigbo A., Phillips A., Gerlach R., Helmig R., Cunningham A.B., Class H., and Spangler L. H. (2012), Darcy-scale modeling of microbially induced carbonate mineral precipitation in sand columns, Water Resour. Res., 48 [2] Phillips A., Lauchnor E., Eldring J., Esposito R., Mitchell A.C., Gerlach R., Cunningham A.B., and Spangler L. H. (2013), Potential CO2 leakage reduction through biofilm-induced calcium carbonate precipitation, Environ. Sci. Technol., 47(1)

  17. Sleep Deprivation and Time-Based Prospective Memory

    PubMed Central

    Esposito, Maria José; Occhionero, Miranda; Cicogna, PierCarla


    Study Objectives: To evaluate the effect of sleep deprivation on time-based prospective memory performance, that is, realizing delayed intentions at an appropriate time in the future (e.g., to take a medicine in 30 minutes). Design: Between-subjects experimental design. The experimental group underwent 24 h of total sleep deprivation, and the control group had a regular sleep-wake cycle. Participants were tested at 08:00. Settings: Laboratory. Participants: Fifty healthy young adults (mean age 22 ± 2.1, 31 female). Interventions: 24 h of total sleep deprivation. Measurements and Results: Participants were monitored by wrist actigraphy for 3 days before the experimental session. The following cognitive tasks were administered: one time-based prospective memory task and 3 reasoning tasks as ongoing activity. Objective and subjective vigilance was assessed by the psychomotor vigilance task and a visual analog scale, respectively. To measure the time-based prospective memory task we assessed compliance and clock checking behavior (time monitoring). Sleep deprivation negatively affected time-based prospective memory compliance (P < 0.001), objective vigilance (mean RT: P < 0.001; slowest 10% RT: P < 0.001; lapses: P < 0.005), and subjective vigilance (P < 0.0001). Performance on reasoning tasks and time monitoring behavior did not differ between groups. Conclusions: The results highlight the potential dangerous effects of total sleep deprivation on human behavior, particularly the ability to perform an intended action after a few minutes. Sleep deprivation strongly compromises time-based prospective memory compliance but does not affect time check frequency. Sleep deprivation may impair the mechanism that allows the integration of information related to time monitoring with the prospective intention. Citation: Esposito MJ, Occhionero M, Cicogna P. Sleep deprivation and time-based prospective memory. SLEEP 2015;38(11):1823–1826. PMID:26085303

  18. Classification of F Ring Features Observed Using Cassini UVIS

    NASA Astrophysics Data System (ADS)

    Meinke, Bonnie K.; Esposito, L. W.; Albers, N.


    The Cassini Ultraviolet Imaging Spectrograph (UVIS) has observed 39 statistically significant F ring features in 103 occultations since July 2004. This work triples the number of features reported by Esposito et al. (2008). As the number of statistically significant features has grown, we are now able to classify them for the purposes of cataloging. We define three categories: moonlet, core, and icicle, which categorize the shapes of features seen to date in the occultation profiles of the F ring. With complete signal attenuation for a radial distance of 600 m, the feature observed in the Alp Leo Rev 9 occultation is the only moonlet observed. A myriad of icicles have been observed, which partially block stellar signal for 30 m to 1 km along the radial expanse of the occultation. The density enhancements responsible for such signal attenuations are likely due to transient clumping of material, evidence that aggregations of material are ubiquitous in the F ring. Finally, the large variety of core region shapes displays how even the general shape of the F ring is ever-changing due to continuous perturbations from internal and external objects. The core region of the F ring usually has a smooth U-shape to it, but particle-size segregation and narrow channeling of material lead to the core region taking the shape of Ws and Vs. These three categories show that F ring behavior is highly variable with time and space and that the locations of certain features correlate to proximity to Prometheus. Our lengthy observing campaign reveals possible states and possible causes of the observed structure. This research was supported by the Cassini Project.

  19. Problems with the equation for viscous damping of density waves

    NASA Astrophysics Data System (ADS)

    Schmidt, J.; Salo, H.; Spahn, F.


    Numerous resonances with external satellites excite density waves in Saturn's rings. A theoretical expression for the damping of these waves, when they propagate away from the resonance location, is derived from a fluid model (GT78: Goldreich and Tremaine, 1978, Icarus, 34, 240, see also: Shu et al., 1984, in Planetary Rings). The magnitude of the shear viscosity of Saturn's rings is inferred from comparison of this theory to the actual damping length of density waves observed in various data sets (e.g. Esposito et al., 1983, Lissauer et al., 1984, Tiscareno et al., 2007). In the theoretical expression for the damping length the fluid's bulk viscosity enters (in addition to the shear viscosity) as well as the dependence of both viscosities on the density of the ring matter. However, generally the bulk viscosity and the effects of the density dependences are neglected when the shear viscosity is inferred from the data. It has already been pointed out in the original paper (GT78) that this neglect lacks adequate justification. This raises the question in how far the inferred viscosities are representative for the rings. In particular, if one takes into acount the density dependence of the viscosities, the expression for the viscous damping transforms into a relation that is equivalent to the stability criterion for viscous overstability. In this case the theory implies that there might be ring regions where density waves do not damp at all but grow in amplitude (GT78). In this paper we re-derive the expression for the wave damping, including the terms stemming from the density dependence of the viscosities. We discuss their effect in the light of the presence of self-gravity wakes in the rings, contributing to viscosity, the probable detection of viscous overstability in parts of Saturn's ring system, and the behaviour of the Janus/Epimetheus m:m-1 wavetrains.

  20. Anabolic effect of plant brassinosteroid

    PubMed Central

    Esposito, Debora; Komarnytsky, Slavko; Shapses, Sue; Raskin, Ilya


    Brassinosteroids are plant-derived polyhydroxylated derivatives of 5a-cholestane, structurally similar to cholesterol-derived animal steroid hormones and insect ecdysteroids, with no known function in mammals. 28-Homobrassinolide (HB), a steroidal lactone with potent plant growth-promoting property, stimulated protein synthesis and inhibited protein degradation in L6 rat skeletal muscle cells (EC50 4 μM) mediated in part by PI3K/Akt signaling pathway. Oral administration of HB (20 or 60 mg/kg/d for 24 d) to healthy rats fed normal diet (protein content 23.9%) increased food intake, body weight gain, lean body mass, and gastrocnemius muscle mass as compared with vehicle-treated controls. The effect of HB administration increased slightly in animals fed a high-protein diet (protein content 39.4%). Both oral (up to 60 mg/kg) and subcutaneous (up to 4 mg/kg) administration of HB showed low androgenic activity when tested in the Hershberger assay. Moreover, HB showed no direct binding to the androgen receptor in vitro. HB treatment was also associated with an improved physical fitness of untrained healthy rats, as evident from a 6.7% increase in lower extremity strength, measured by grip test. In the gastrocnemius muscle of castrated animals, HB treatment significantly increased the number of type IIa and IIb fibers and the cross-sectional area of type I and type IIa fibers. These findings suggest that oral application of HB triggers selective anabolic response with minimal or no androgenic side-effects and begin to elucidate the putative cellular targets for plant brassinosteroids in mammals.—Esposito, D., Komarnytsky, S., Shapses, S., Raskin, I. Anabolic effect of plant brassinosteroid. PMID:21746867

  1. Glory on Venus cloud tops and the unknown UV absorber

    NASA Astrophysics Data System (ADS)

    Markiewicz, W. J.; Petrova, E.; Shalygina, O.; Almeida, M.; Titov, D. V.; Limaye, S. S.; Ignatiev, N.; Roatsch, T.; Matz, K. D.


    We report on the implications of the observations of the glory phenomenon made recently by Venus Express orbiter. Glory is an optical phenomenon that poses stringent constraints on the cloud properties. These observations thus enable us to constrain two properties of the particles at the cloud tops (about 70 km altitude) which are responsible for a large fraction of the solar energy absorbed by Venus. Firstly we obtain a very accurate estimate of the cloud particles size to be 1.2 μm with a very narrow size distribution. We also find that for the two observations presented here the clouds are homogenous, as far as cloud particles sizes are concerned, on scale of at least 1200 km. This is in contrast to previous estimates that were either local, from entry probes data, or averaged over space and time from polarization data. Secondly we find that the refractive index for the data discussed here is higher than that of sulfuric acid previously proposed for the clouds composition (Hansen, J.E., Hovenier, J.W. [1974]. J. Atmos. Sci. 31, 1137-1160; Ragent, B. et al. [1985]. Adv. Space Res. 5, 85-115). Assuming that the species contributing to the increase of the refractive index is the same as the unknown UV absorber, we are able to constrain the list of candidates. We investigated several possibilities and argue that either small ferric chloride (FeCl3) cores inside sulfuric acid particles or elemental sulfur coating their surface are good explanations of the observation. Both ferric chloride and elemental sulfur have been suggested in the past as candidates for the as yet unknown UV absorber (Krasnopolsky, V.A. [2006]. Planet. Space Sci. 54, 1352-1359; Mills, F.P. et al. [2007]. In: Esposito, L.W., Stofan, E.R., Cravens, T.E. (Eds.), Exploring Venus as a Terrestrial Planet, vol. 176. AGU Monogr. Ser., Washington, DC, pp. 73-100).

  2. Analyzing Bleriot's propeller gaps in Cassini NAC images

    NASA Astrophysics Data System (ADS)

    Hoffmann, Holger; Chen, Cheng; Seiß, Martin; Albers, Nicole; Spahn, Frank; Nic


    Among the great discoveries of the Cassini mission are the propeller-shaped structures created by small moonlets embedded in Saturn's dense rings. These moonlets are not massive enough to counteract the viscous ring diffusion to open and maintain circumferential gaps, distinguishing them from ring-moons like Pan and Daphnis.Although one of the defining features of propeller structures, well-formed partial gaps have been resolved by the Imaging Science Subsystem Narrow Angle Camera onboard the Cassini spacecraft only for the largest known propeller named Bleriot. We analyze images of the sunlit side of Saturn's outer A ring showing the propeller Bleriot with clearly visible gaps. By fitting a Gaussian to radial brightness profiles at different azimuthal locations, we obtain the evolution of gap minimum and gap width downstream of the moonlet.We report two findings:1) Numerical simulations indicate that the radial separation of the partial propeller gaps is expected to be 4 Hill radii (Spahn and Sremcevic, 2000, A&A). We infer Bleriot's Hill radius to be a few hundred meters, consistent with values given by Sremcevic et al. (2014, DPS) and Hoffmann et al. (2015, Icarus).2) In order to estimate the ring viscosity in the region of Saturn's outer A ring, where Bleriot orbits, we fit several model functions (one example being the analytic solution derived by Sremcevic, Spahn and Duschl, 2002, MNRAS) describing the azimuthal evolution of the surface density in the propeller gap region to the data obtained from the image analysis. We find viscosity values consistent with the parameterization of ring viscosity by Daisaka et al. (2001, Icarus), but significantly lower than the upper limit given by Esposito et al. (1983, Icarus)

  3. Modelling of the Chemistry of Sulfur Oxides in the Middle Atmosphere of Venus

    NASA Astrophysics Data System (ADS)

    Mills, F. P.; Johri, S.; Yung, Y. L.; Allen, M.


    Venus' middle atmosphere (˜ 60-110 km) is a dynamic region in which photochemistry dominates and the time scales for chemical loss and transport are roughly comparable for many species. It is also a region where it has been difficult to observe the abundances of species that play important roles in two of the dominant chemical cycles on Venus. The CO2 cycle comprises photodissociation of CO2 to produce CO and O, transport of some CO and O to the night side, production of O2 from 2O+M→O2+M on the day and night sides, and production of CO2 from CO and O2. The sulfur oxidation cycle comprises oxidation of SO2 to form H2SO4, condensation, subsidence of some particles to the lower atmosphere, evaporation, and thermal decomposition or photodissociation to produce SO2 and H2O. Recent mesospheric observations have provided clear evidence of diurnal variability in the abundances of sulfur oxides. Observed SO has its peak abundance on the day side and observed SO2 has its peak abundance on the night side (Sandor et al, 2008). We have used global average model calculations (Pernice et al, 2004; Mills and Allen, 2007) to derive approximate analytic expressions for [SO], [SO2], and [SO]/[SO2] on the day and night sides. The results are generally consistent across a broad range of atmospheric oxidation states (Mills and Allen, 2007). Our model results and the key uncertainties will be discussed. A related topic is the identity of the UV-blue absorber that is responsible for the absorption observed in the upper cloud layer (˜ 60-70 km) at 320-500 nm. One proposed suggestion is S2O (Hapke and Graham, 1985; Na and Esposito, 1997). Our model results for S2O and their implications will be discussed and compared with previous work.

  4. F Ring Mini-Jets

    NASA Astrophysics Data System (ADS)

    Attree, N.; Murray, C.; Cooper, N. J.; Williams, G.


    Mini-jets are small, (~50 km) linear features observed in Cassini images to be emanating from Saturn's F ring; they are believed to be produced by collisions with a local population of moonlets. An analysis of one such feature, observed over the course of a ~7.5 h sequence as its length changed from ~75 km to ~250 km while it simultaneously appeared to collapse back into the core, supports the collisional theory of their origin [1]. Orbit determination suggests that this mini-jet consisted of ring material displaced by a ~1 m/s collision with a nearby object, resulting in paths relative to the core that are due to a combination of keplerian shear and epicyclic motion. The colliding object itself is likely to be too small to resolve in these images but represents just one member of a population of F ring moonlets. Such a population has been investigated by UVIS occultations [2], and other methods, but generally remains unresolved in Cassini images. Collisional features such as this mini-jet therefore provide an additional tracer for the region's moonlet population. In this talk we will present the results of recent work in measuring and describing a subset of ~350 catalogued mini-jets, applying knowledge gained from the original mini-jet feature. Their distribution in space and time, proximity to Prometheus and evolution are all examined in an effort to place constraints on the properties of the underlying population of colliding objects. References [1] N. O. Attree, C. D. Murray, N. J. Cooper, and G. A. Williams. Detection of low velocity collisions in Saturn's F ring. Ap. J. Lett. (In press). [1] B. K. Meinke, L. W. Esposito, N. Albers, and M. Sremevi. Classification of F ring features observed in cassini UVIS occultations. Icarus, 218(1):545 - 554, 2012.

  5. GPR Technologies and Methodologies in Italy: A Review

    NASA Astrophysics Data System (ADS)

    Benedetto, Andrea; Frezza, Fabrizio; Manacorda, Guido; Massa, Andrea; Pajewski, Lara


    GPR techniques and technologies have been subject of intense research activities at the Italian level in the last 15 years because of their potential applications specifically to civil engineering. More in detail, several innovative approaches and models have been developed to inspect road pavements to measure the thickness of their layers as well as to diagnose or prevent damage. Moreover, new frontiers in bridge inspection as well as in geotechnical applications such as slides and flows have been investigated using GPR. From the methodological viewpoint, innovative techniques have been developed to solve GPR forward-scattering problems, as well to locate and classify subsurface targets in real-time and to retrieve their properties through multi-resolution strategies, and linear and non-linear methodologies. Furthermore, the application of GPR and other non-destructive testing methods in archaeological prospecting, cultural heritage diagnostics, and in the localization and detection of vital signs of trapped people has been widely investigated. More recently, new theoretical and empirical paradigms regarding water moisture evaluation in various porous media and soil characterization have been published as the results of long terms research activities. Pioneer studies are also currently under development with the scope to correlate GPR measurement with mechanical characteristics of bound and unbound construction materials. In such a framework, this abstract will be aimed at reviewing some of the most recent advances of GPR techniques and technologies within the Italian industrial and academic communities [also including their application within international projects such as FP7 ISTIMES (], and at envisaging some of the most promising research trends currently under development. Acknowledgment - This work was supported by COST Action TU1208 'Civil Engineering Applications of Ground Penetrating Radar' References [1] M. Balsi, S. Esposito, F

  6. PREFACE: Workshop Photograph and Program

    NASA Astrophysics Data System (ADS)


    Workshop photograph Workshop Program Sunday 28 March 201019:00-21:00 Reception at Okura Frontier Hotel Tsukuba(Buffet style dinner with drink) Monday 29 March 2010Introduction (Chair: André Rubbia (ETH Zurich))09:00 Welcome address (05') Atsuto Suzuki (KEK)09:05 Message from CERN on neutrino physics (10') Sergio Bertolucci (CERN)09:15 Message from FNAL on neutrino physics (10') Young Kee Kim (FNAL)09:25 Message from KEK on neutrino physics (10') Koichiro Nishikawa (KEK)09:35 Introductory remark on GLA2010 (10') Takuya Hasegawa (KEK) Special session (Chair: Koichiro Nishikawa (KEK))09:45 The ICARUS Liquid Argon TPC (45') Carlo Rubbia (CERN)10:30-11:00 Coffee break Main goals of Giant Liquid Argon Charge Imaging Experiments I (Chair: Takashi Kobayashi (KEK))11:00 Results from massive underground detectors (non accelerator) (30') Takaaki Kajita (ICRR, U. of Tokyo)11:30 Present long baseline neutrino experiments (30') Chang Kee Jung (SUNY Stony Brook)12:00-12:10 Workshop picture12:10-14:00 Lunch break Main goals of Giant Liquid Argon Charge Imaging Experiments II (Chair: Takashi Kobayashi (KEK))14:00 Physics goals of the next generation massive underground experiments (30') David Wark (Imperial College London)14:30 Near detectors for long baseline neutrino experiments (20') Tsuyoshi Nakaya (Kyoto U.) Lessons on Liquid Argon Charge Imaging technology from ongoing developments (Chair: Chang Kee Jung (SUNY Stony Brook))14:50 WARP (30') Claudio Montanari (U. of Pavia)15:20 ArDM (30') Alberto Marchionni (ETH Zurich)15:50 From ArgoNeuT to MicroBooNE (30') Bonnie Fleming (Yale U.)16:20 250L (30') Takasumi Maruyama (KEK)16:50 The DEAP/CLEAN project (20') Mark Boulay (Queen's U.)17:10-17:40 Coffee break Lessons from Xe based Liquids Imaging detectors (Chair: Flavio Cavanna (U. of L'Aquilla))17:30 MEG (20') Satoshi Mihara (KEK)17:50 The XENON project (20') Elena Aprile (Columbia U.)18:10 XMASS (20') Hiroyuki Sekiya (ICRR, U. of Tokyo) Studies on physics performance (Chair

  7. To Mercury dynamics

    NASA Astrophysics Data System (ADS)

    Barkin, Yu. V.; Ferrandiz, J. M.

    Present significance of the study of rotation of Mercury considered as a core-mantle system arises from planned Mercury missions. New high accurate data on Mercury's structure and its physical fields are expected from BepiColombo mission (Anselmi et al., 2001). Investigation of resonant rotation of Mercury, begun by Colombo G. (1966), will play here main part. New approaches to the study of Mercury dynamics and the construction of analytical theory of its resonant rotation are suggested. Within these approaches Mercury is considered as a system of two non-spherical interacting bodies: a core and a mantle. The mantle of Mercury is considered as non-spherical, rigid (or elastic) layer. Inner shell is a liquid core, which occupies a large ellipsoidal cavity of Mercury. This Mercury system moves in the gravitational field of the Sun in resonant traslatory-rotary regime of the resonance 3:2. We take into account only the second harmonic of the force function of the Sun and Mercury. For the study of Mercury rotation we have been used specially designed canonical equations of motion in Andoyer and Poincare variables (Barkin, Ferrandiz, 2001), more convenient for the application of mentioned methods. Approximate observational and some theoretical evaluations of the two main coefficients of Mercury gravitational field J_2 and C22 are known. From observational data of Mariner-10 mission were obtained some first evaluations of these coefficients: J_2 =(8± 6)\\cdot 10-5(Esposito et al., 1977); J_2 =(6± 2)\\cdot 10-5and C22 =(1.0± 0.5)\\cdot 10-5(Anderson et al., 1987). Some theoretical evaluation of ratio of these coefficients has been obtained on the base of study of periodic motions of the system of two non-spherical gravitating bodies (Barkin, 1976). Corresponding values of coefficients consist: J_2 =8\\cdot 10-5and C22 =0.33\\cdot 10-5. We have no data about non-sphericity of inner core of Mercury. Planned missions to Mercury (BepiColombo and Messenger) promise to

  8. Applying the seismic interferometry method to vertical seismic profile data using tunnel excavation noise as source

    NASA Astrophysics Data System (ADS)

    Jurado, Maria Jose; Teixido, Teresa; Martin, Elena; Segarra, Miguel; Segura, Carlos


    response and the reflection response for a 1D multilayer structure, and next 3D approach (Wapenaar 2004). As a result of this seismic interferometry experiment the 3D reflectivity model (frequencies and resolution ranges) was obtained. We proved also that the seismic interferometry approach can be applied in asynchronous seismic auscultation. The reflections detected in the virtual seismic sections are in agreement with the geological features encountered during the excavation of the tunnel and also with the petrophysical properties and parameters measured in previous geophysical borehole logging. References Claerbout J.F., 1968. Synthesis of a layered medium from its acoustic transmision response. Geophysics, 33, 264-269 Flavio Poletto, Piero Corubolo and Paolo Comeli.2010. Drill-bit seismic interferometry whith and whitout pilot signals. Geophysical Prospecting, 2010, 58, 257-265. Wapenaar, K., J. Thorbecke, and D. Draganov, 2004, Relations between reflection and transmission responses of three-dimensional inhomogeneous media: Geophysical Journal International, 156, 179-194.

  9. Prefazione al volume 9 di Gerbertus in Transitu Mercurii

    NASA Astrophysics Data System (ADS)

    Sigismondi, Costantino


    observed in phase with new Moon. 11. The penumbral phase of the lunar eclipse of 28/9/2015 and 12. 2015 four PHEMU are observed visually and digitally. The transit of Mercury on the Sun could have been predicted or/and observed at the time of Gerbert? The 13th roman congress on Gerbert is celebrated the day of 2016 transit: their 13. algebra, 14. physics (solar) and 15. optical astronomy are discussed in detail. 16. The measurement of the solar diameter with the eclipse of 9 march 2016 is obtained, using public domain data. 17. The Carme figuratum of Gerbert was dedicated to the Emperor Otto II: Flavio Nuvolone enlighten this aspect of early middle age literature of court poets, with chryptographical schemes.

  10. Searching for a traveling feature in Saturn's rings in Cassini Imaging Science Subsystem data

    NASA Astrophysics Data System (ADS)

    Aye, Klaus-Michael; Rehnberg, Morgan; Brown, Zarah; Esposito, Larry W.


    Introduction: Using Cassini UVIS occultation data, a traveling wave feature has been identified in the Saturn rings that is most likely caused by the radial positions swap of the moons Janus and Epimetheus [1]. The hypothesis is that non-linear interferences between the linear density waves when being relocated by the moon swap create a solitary wave that is traveling outward through the rings. The observations in [1] further lead to the derivation of values for the radial travel speeds of the identified traveling features, from 39.6 km/yr for the Janus 5:4 resonance up to 45.8 for the Janus 4:3 resonance.Previous confirmations in ISS data: Work in [1] also identified the feature in Cassini Imaging Science Subsystem (ISS) data that was taken around the time of the UVIS occultations where the phenomenon was first discovered, so far one ISS image for each Janus resonances 2:1, 4:3, 5:4, and 6:5.Search guided by predicted locations: Using the observation-fitted radial velocities from [1], we can extrapolate these to identify Saturn radii at which the traveling feature should be found at later times. Using this and new image analysis and plotting tools available in [2], we have identified a potential candidate feature in an ISS image that was taken 2.5 years after the feature causing moon swap in January 2006. We intend to expand our search by identifying candidate ISS data by a meta-database search constraining the radius at future times corresponding to the predicted future locations of the hypothesized solitary wave and present our findings at this conference.References: [1] Rehnberg, M.E., Esposito, L.W., Brown, Z.L., Albers, N., Sremčević, M., Stewart, G.R., 2016. A Traveling Feature in Saturn's Rings. Icarus, accepted in June 2016. [2] K.-Michael Aye. (2016). pyciss: v0.5.0. Zenodo. 10.5281/zenodo.53092

  11. Proceedings of RIKEN BNL Research Center Workshop: Progress in High-pT Physics at RHIC

    SciTech Connect

    Bazilevsky, A.; Bland, L.; Vogelsang, W.


    excellent presentations throughout and productive discussions, which showed the importance and unique value of the RHIC high-p{sub T} program. We are grateful to all participants for coming to BNL. The support provided by the RIKEN-BNL Research Center for this workshop has been magnificent, and we are most grateful for it. We also thank Brookhaven National Laboratory and the U.S. Department of Energy for providing additional support and for the facilities to hold this workshop. Finally, sincere thanks go to Pamela Esposito for her most efficient and tireless work in organizing and running the workshop.

  12. Temporal variations of UV reflectivity of Venus observed by the Venus Monitoring Camera onboard Venus Express.

    NASA Astrophysics Data System (ADS)

    Lee, Yeon Joo; Imamura, Takeshi; Schroder, Stefan

    The UV channel of the Venus Monitoring Camera (VMC) onboard Venus Express (VEX) detects dark and bright features at the cloud top level all over the globe. This UV contrast is affected by the abundance of an unknown UV absorber, which is located within the upper cloud layer, and the upper haze above the cloud tops (Pollack et al.,1979; Esposito, 1980). The unknown UV absorber is a major sink of solar energy in the Venus middle atmosphere (Crisp, 1986). The upper haze and clouds take part in sulfur photochemical processes in the Venus mesosphere (Mills et al., 2007). At the cloud top altitude the zonal wind speed is highest, resulting in changes in cloud morphology in a few days. Therefore, the features shown in the UV images are diagnostic for atmospheric dynamics and chemistry. By analyzing VMC UV images, we found there is a clear decreasing trend of the global mean albedo by 20-30% over 2000 orbits (=2000 Earth days) of VEX operation. This decrease is driven by changes at high latitudes. This implies that the typical latitudinal albedo distribution, bright polar hood and dark equatorial region, varies over time. The latitudinal difference in albedo changes from a clear brightness gradient from pole to equator to an almost identical brightness in both regions. Interestingly, this temporal variation is similar to that of the SO2 abundance above the cloud tops, observed in the same period (Marcq et al., 2013). This suggests a reduction of SO2 over the equator decreases the amount of upper haze at high latitudes, as less sulfur is supplied by the meridional circulation. We investigate the phase angle dependence of the latitudinal albedo difference, which reveals that the vertical distribution of the UV absorbers and the upper haze varies in time as well. Our results show large scale variations in Venusian atmospheric dynamics near the cloud tops, represented by temporal changes in the amount of upper haze at high latitudes and/or in the vertical distribution of the

  13. Life after Venus Express: Science goals for a European Venus radar orbiter

    NASA Astrophysics Data System (ADS)

    Wilson, Colin; Ghail, Richard

    ESA’s Venus Express mission has led to a renaissance of Venus science, following a dearth of Venus missions in the previous 15 years. Venus Express has made many discoveries in atmospheric science, for which its payload was optimised; however it has also provided tantalising hints about the geological activity of the planet. Mesospheric sulphur dioxide abundances vary by 1000% on decadal timescales, in a pattern which suggests episodic volcanic injections [Marcq et al. Nature Geosci 2013; Esposito, Science 1984]; anomalous emissivity near suggest volcanic hotspots implies geologically recent, as-yet-unweathered lava flows [Smrekar et al., Science 2010]; and recent results, if confirmed, show temporal evolution of thermal emission from some regions of the surface may be direct evidence of volcanic activity during the duration of the VEx mission [Shalygin et al., LPSC 2014]. While there are more results to be obtained yet from the Venus Express dataset, further investigation of these phenomena will require a new Venus mission. We therefore propose an orbiter mission focussed on characterising the geological activity of Venus. The key instrument would be a Synthetic Aperture Radar (SAR). Why a radar mission following NASA’s Magellan mission? Radar capabilities are vastly improved in the last 30 years and a modern radar would be capable of spatial resolution approaching two orders of magnitude better than that from Magellan; this enables a wide range of investigations, from detailed study of tectonic, volcanic and Aeolian features, to stratigraphy for better reconstruction of geological epochs. Interferometric SAR could also be used to study the centimetre-scale surface deformations due to current volcanic or tectonic activity. Constraints on interior structure can be obtained not only from improved gravity mapping (from spacecraft tracking) but also by studying the spin state of Venus from high-resolution radar measurements. The radar measurements will be

  14. Forming Inner Ice-Rich Moons at Saturn from a Massive Early Ring

    NASA Astrophysics Data System (ADS)

    Salmon, Julien; Canup, Robin M.


    Saturn’s rings are 90 to 95% water ice. As a group, Saturn’s moons interior to and including Tethys are also about 90% ice. The small inner moons (interior to and including Janus) are dynamically young with histories tied to that of the rings (e.g., Goldreich & Tremaine 1982; Esposito 1986). Charnoz et al. (2010) showed that ring material viscously spreading outward across the Roche limit can produce these small moons and their observed mass vs. distance relationship within the last 107 years. Canup (2010) proposed that at the end of Saturn’s formation, tidal stripping from a differentiated Titan-sized moon as it spiraled into Saturn could have produced a massive 1024 - 1025 g initial ice ring, and that Mimas, Enceladus and Tethys could have been similarly spawned from this primordial ring as it viscously evolved. Charnoz et al. (2011) considered a massive ice-rock ring and a tidal dissipation factor for Saturn of Q ˜ 103, and found that satellites out to Rhea could be spawned from such a ring. However the likelihood of such a small value for Q is debated. In addition, capture into mutual mean motion resonances and resulting eccentricity growth (not included in the Charnoz et al. model) could lead to orbital destabilization as the moons tidally expand over large distances (Peale & Canup 2014). Here we consider a dissipation factor for Saturn Q ˜ 104 - 105 and investigate whether Mimas, Enceladus and Tethys could have been spawned from a massive initial ice ring. In this scenario, the rock in these moons would be delivered by material from outside the rings, e.g. by heliocentric impactors during the LHB (Canup 2013). We have expanded a numerical model developed to study the accretion of Earth's Moon (Salmon and Canup 2012, 2014), which couples an analytic Roche-interior disk model to the N-body code SyMBA for material exterior to the Roche limit, so that we can directly track the accretion and mutual interactions of growing satellites (including mean

  15. Martian Low albedo regions: views from PFS-MEX long wavelenght channel

    NASA Astrophysics Data System (ADS)

    Palomba, E.; D'Amore, M.; Zinzi, A.; Maturilli, A.; Formisano, V.

    Thermal Emission Spectrometer (TES, onboard the Mars Global Surveyor spacecraft) observations allowed the global characterization of the surface of Mars (Bandfield et al, 2003) . The dark regions (low albedo) on Mars were divided in two main different classes: the type 1 or basalt rich units and the type 2 or weathered basalt units. About five years later, the ESA mission Mars Express approached Mars acquiring new data. Here we show the result of the analysis we performed onto the Planetary Fourier Spectrometer Long wavelength channel spectra (Formisano et al., 2004). This data are centered in the thermal spectral interval where only the Mars thermal emitted radiation measured (5-45 µm). After the atmospheric (dust and water ice) extraction procedure (D'Amore et al, 2006), a deconvolution technique is applied to the IR surface spectra in order to obtain the mineral composition of the observed Martian regions (Bandfield and Smith., 2003). The spectral shape due to the surface is a residual product of the observed spectra, as the main feature in this spectral interval is produced by aerosols. Therefore, a large S/N ratio is necessary to obtain reliable results. To enhance it, we degraded the PFS spectral resolution from 1 cm-1 to the typical TES one (10 cm-1 ) and we selected the spectra with the higher surface temperatures only (T> 260 K). References Bandfield, J. L., Hamilton, V. E., Christensen, P. R., A global view of Martian surface composition from MGS-TES, 2003, Science, 301, 1084-1087. Bandfield, J., L. and Smith, M., D., 2003, Multiple emission angle surface-atmosphere separations of thermal emission spectrometer data, Icarus, Volume 161, Issue 1, p. 47-65 D'Amore et al, 2006, Extracting the aerosol spectral features on Mars from PFS-MEX data,COSPAR Conf. Formisano, V., Angrilli, F., Arnold, G., Atreya, S., Bianchini, G., Biondi, D., Blanco, A., Blecka, M. I., Coradini, A., Colangeli, L., Ekonomov, A., Esposito, F., Fonti, S., Giuranna, M., Grassi, D

  16. A procedure to analyze nonlinear density waves in Saturn's rings using several occultation profiles

    NASA Astrophysics Data System (ADS)

    Rappaport, Nicole J.; Longaretti, Pierre-Yves; French, Richard G.; Marouf, Essam A.; McGhee, Colleen A.


    Cassini radio science experiments have provided multiple occultation optical depth profiles of Saturn's rings that can be used in combination to analyze density waves. This paper establishes an accurate procedure of inversion of the wave profiles to reconstruct the wave kinematic parameters as a function of semi-major axis, in the nonlinear regime. This procedure is established using simulated data in the presence of realistic noise perturbations, to control the reconstruction error. It is then applied to the Mimas 5:3 density wave. There are two important concepts at the basis of this procedure. The first one is that it uses the nonlinear representation of density waves, and the second one is that it relies on a combination of optical depth profiles instead of just one profile. A related method to analyze density waves was devised by Longaretti and Borderies [Longaretti, P.-Y., Borderies, N., 1986. Icarus 67, 211-223] to study the nonlinear density wave associated with the Mimas 5:3 resonance, but the single photopolarimetric profile provided limited constraints. Other studies of density waves analyzing Cassini data [ Colwell, J.E., Esposito, L.W., 2007. Bull. Am. Astron. Soc. 39, 461; Tiscareno, M.S., Burns, J.A., Nicholson, P.D., Hedman, M.M., Porco, C.C., 2007. Icarus 189, 14-34] are based on the linear theory and find inconsistent results from profile to profile. Multiple cuts of the rings are helpful in a fundamental way to ensure the accuracy of the procedure by forcing consistency among the various optical depth profiles. By way of illustration we have applied our procedure to the Mimas 5:3 density wave. We were able to recover precisely the kinematic parameters from the radio experiment occultation data in most of the propagation region; a preliminary analysis of the pressure-corrected dispersion allowed us to determine new but still uncertain values for the opacity ( K≃0.02 cm/g) and velocity dispersion of ( c≃0.6 cm/s) in the wave region. Our

  17. Influence of shieldings or antioxidants on DNA damage and early and delyed cell death induced in human fibroblasts by accelerated 595 MeV/u Fe ions

    NASA Astrophysics Data System (ADS)

    Antonelli, Francesca; Esposito, Giuseppe; Dini, Valentina; Belli, Mauro; Campa, Alessandro; Sorrentino, Eugenio; Antonella Tabocchini, Maria; Lobascio, Cesare; Berra, Bruno

    HZE particles from space radiation raise an important protection concern during long-term astronauts' travels. As high charge, high energy particles interact with a shield, both projec-tile and target fragmentation may occurs, so that the biological properties of the emerging radiation field depend on the nature and energy of the incident particles, and on the nature and thickness of the shield. We have studied the influence of PMMA and Kevlar shielding as well as the antioxidant compounds Rosmarinic acid or Resveratrol on DNA damage induction and processing (as evaluated by the g-H2AX phosphorylation assay) and on early and delayed cell death in AG01522 human fibroblasts irradiated with Fe ions of 595 MeV/u at the NASA Space Radiation Laboratory (NSRL), Brookhaven National Laboratory (BNL, Upton, USA). Insertion of PMMA or Kevlar shields (10 g/cm2 thick) gave no substantial change in the bio-logical effect per unit dose on the sample for all the end points studied. When irradiation was performed in the presence of 300 mM Rosmarinic acid or Resveratrol no difference were found for both early and delayed cell death, while a slight protective effect was observed for the initial and residual DNA damage. For both early and delayed cell death, Fe-ions are more effective than g-rays. The number of Fe-ion induced g-H2AX foci is instead lower than that induced by g-rays, due to the presence of multiple DSB within a single focus induced by Fe-ions. From a comparison of the g-H2AX data with the results on DNA fragmentation obtained with 414 MeV/u Fe ions at the Heavy Ions Medical Accelerator (HIMAC, Chiba, Japan) and with 1 GeV/u Fe ions at BNL, in the absence or in the presence of PMMA shields (Esposito et al, Advance in Space Research 2004) we speculate that the overall effect of the shield is a balance between the contributions due to the slowing down of the primary particles and that due to the nuclear fragmentation. Acknowledgment: Financial support from ASI project

  18. A hybrid fluid - N-body model for the formation of the Moon

    NASA Astrophysics Data System (ADS)

    Salmon, J.; Canup, R. M.


    We perform numerical simulations of the formation of the Moon from an impact-generated disk, with a new hybrid model: material within the Roche-limit is represented by a fluid inner disk with a vapor atmosphere, and we track outer solid bodies with an N-body code. We include: (1) viscous spreading of the inner disk, with either an instability driven viscosity (Ward & Cameron 1978), or a radiation-limited viscosity (Thompson & Stevenson 1988); (2) accretion of moonlets when material crosses the Roche limit; (3) tidal accretion criteria (Canup & Esposito 1995) to determine whether collisions rebound or merge; and (4) interactions of orbiting bodies with the inner disk at 0-th order resonances. While pure N-body simulations show accretion timescales of less than a year (e.g., Ida et al. 1997), the slow spreading of the inner disk due to its radiation-limited viscosity can delay the final accretion of the Moon by up to hundreds of years. Such long timescales might allow the disk to compositionally equilibrate with the Earth (Pahlevan & Stevenson 2007), providing an explanation for, e.g., the identical O-isotope compositions of the Earth and Moon. Our typical simulation shows a three-step accretion process: (1) bodies outside the Roche limit collide, accrete and scatter until only a few massive objects remain; (2) the inner disk is confined below the Roche limit by the outer bodies, which in turn recede away, eventually allowing the inner disk to spread outward; and (3) as the inner disk reaches the Roche limit, new moonlets are spawned and collide with the outer bodies. This process continues until the inner disk is depleted (see Figure). Resonant confinement of the inner disk is very efficient, so that most of its mass is lost onto the planet: a ~2 lunar mass disk with 70% of the mass initially in the inner disk leads to the formation of a 0.8 lunar mass Moon, with ~25% of its mass originating from the inner disk, where material may have compositionally equilibrated

  19. The ESI scale, an ethical approach to the evaluation of seismic hazards

    NASA Astrophysics Data System (ADS)

    Porfido, Sabina; Nappi, Rosa; De Lucia, Maddalena; Gaudiosi, Germana; Alessio, Giuliana; Guerrieri, Luca


    studies have been reviewed: the destructive 1976 February 4 Guatemala, earthquake (M 7.5) and the 1743 February 20 Nardò, historical earthquake (Salento, Southern Italy). The re-analysis of both earthquakes contributes to define more realistic seismic scenarios in terms of intensities assessment and consequent regional seismic hazards. References Michetti A.M., Esposito E., Guerrieri L., Porfido S., Serva L., Tatevossian R., Vittori E., Audemard F., Azuma T., Clague J., Comerci V., Gurpinar A., Mccalpin J., Mohammadioun B., Mörner N.A, Ota Y. And E. Roghozin - 2007. Intensity Scale ESI 2007, Mem. Descrittive della Carta Geologica d'Italia, Roma, 74, 53 pp

  20. Temperature-induced conformational change at the catalytic site of Sulfolobus solfataricus alcohol dehydrogenase highlighted by Asn249Tyr substitution. A hydrogen/deuterium exchange, kinetic, and fluorescence quenching study.


    Secundo, Francesco; Russo, Consiglia; Giordano, Antonietta; Carrea, Giacomo; Rossi, Mosè; Raia, Carlo A


    A combination of hydrogen/deuterium exchange, fluorescence quenching, and kinetic studies was used to acquire experimental evidence for the crystallographically hypothesized increase in local flexibility which occurs in thermophilic NAD(+)-dependent Sulfolobus solfataricus alcohol dehydrogenase (SsADH) upon substitution Asn249Tyr. The substitution, located at the adenine-binding site, proved to decrease the affinity for both coenzyme and substrate, rendering the mutant enzyme 6-fold more active when compared to the wild-type enzyme [Esposito et al. (2003) FEBS Lett. 539, 14-18]. The amide H/D exchange data show that the wild-type and mutant enzymes have similar global flexibility at 22 and 60 degrees C. However, the temperature dependence of the Stern-Volmer constant determined by acrylamide quenching shows that the increase in temperature affects the local flexibility differently, since the K(SV) increment is significantly higher for the wild-type than for the mutant enzyme over the range 18-45 degrees C. Interestingly, the corresponding van't Hoff plot (log K(SV) vs 1/T) proves nonlinear for the apo and holo wild-type and apo mutant enzymes, with a break at approximately 45 degrees C in all three cases due to a conformational change affecting the tryptophan microenvironment experienced by the quencher molecules. The Arrhenius and van't Hoff plots derived from the k(cat) and K(M) thermodependence measured with cyclohexanol and NAD(+) at different temperatures display an abrupt change of slope at 45-50 degrees C. This proves more pronounced in the case of the mutant enzyme compared to the wild-type enzyme due to a conformational change in the structure rather than to an overlapping of two or more rate-limiting reaction steps with different temperature dependencies of their rate constants. Three-dimensional analysis indicates that the observed conformational change induced by temperature is associated with the flexible loops directly involved in the substrate and

  1. Proceedings of RIKEN BNL Research Center Workshop: P- and CP-odd Effects in Hot and Dense Matter

    SciTech Connect

    Deshpande, A.; Fukushima, K.; Kharzeev, D.; Warringa, H.; Voloshin, S.


    participants, and express our gratitude to the event coordinator Pam Esposito for her hard work.

  2. Efficiency at maximum power output of linear irreversible Carnot-like heat engines

    NASA Astrophysics Data System (ADS)

    Wang, Yang; Tu, Z. C.


    The efficiency at maximum power output of linear irreversible Carnot-like heat engines is investigated based on the assumption that the rate of irreversible entropy production of the working substance in each “isothermal” process is a quadratic form of the heat exchange rate between the working substance and the reservoir. It is found that the maximum power output corresponds to minimizing the irreversible entropy production in two isothermal processes of the Carnot-like cycle, and that the efficiency at maximum power output has the form ηmP=ηC/(2-γηC), where ηC is the Carnot efficiency, while γ depends on the heat transfer coefficients between the working substance and two reservoirs. The value of ηmP is bounded between η-≡ηC/2 and η+≡ηC/(2-ηC). These results are consistent with those obtained by Chen and Yan [J. Chem. Phys.JCPSA60021-960610.1063/1.455832 90, 3740 (1989)] based on the endoreversible assumption, those obtained by Esposito [Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.105.150603 105, 150603 (2010)] based on the low-dissipation assumption, and those obtained by Schmiedl and Seifert [Europhys. Lett.EULEEJ0295-507510.1209/0295-5075/81/20003 81, 20003 (2008)] for stochastic heat engines which in fact also satisfy the low-dissipation assumption. Additionally, we find that the endoreversible assumption happens to hold for Carnot-like heat engines operating at the maximum power output based on our fundamental assumption, and that the Carnot-like heat engines that we focused on do not strictly satisfy the low-dissipation assumption, which implies that the low-dissipation assumption or our fundamental assumption is a sufficient but non-necessary condition for the validity of ηmP=ηC/(2-γηC) as well as the existence of two bounds, η-≡ηC/2 and η+≡ηC/(2-ηC).

  3. Gemini Planet Imager Exoplanet Survey: Key Results Two Years Into The Survey

    NASA Astrophysics Data System (ADS)

    Marchis, Franck; Rameau, Julien; Nielsen, Eric L.; De Rosa, Robert J.; Esposito, Thomas; Draper, Zachary H.; Macintosh, Bruce; Graham, James R.; GPIES


    The Gemini Planet Imager Exoplanet Survey (GPIES) is targeting 600 young, nearby stars using the GPI instrument. We report here on recent results obtained with this instrument from our team.Rameau et al. (ApJL, 822 2, L2, 2016) presented astrometric monitoring of the young exoplanet HD 95086 b obtained with GPI between 2013 and 2016. Efficient Monte Carlo techniques place preliminary constraints on the orbital parameters of HD 95086 b. Under the assumption of a coplanar planet-disk system, the periastron of HD 95086 b is beyond 51 AU. Therefore, HD 95086 b cannot carve the entire gap inferred from the measured infrared excess in the SED of HD 95086. Additional photometric and spectroscopic measurements reported by de Rosa et al. (2016, apJ, in press) showed that the spectral energy distribution of HD 95086 b is best fit by low temperature (T~800-1300 K), low surface gravity spectra from models which simulate high photospheric dust content. Its temperature is typical to L/T transition objects, but the spectral type is poorly constrained. HD 95086 b is an important exoplanet to test our models of atmospheric properties of young extrasolar planets.Direct detections of debris disk are keys to infer the collisional past and understand the formation of planetary systems. Two debris disks were recently studied with GPI:- Draper et al. (submitted to ApJ, 2016) show the resolved circumstellar debris disk around HD 111520 at a projected range of ~30-100 AU using both total and polarized H-band intensity. Structures in the disks such as a large brightness asymmetry and symmetric polarization fraction are seen. Additional data would confirm if a large disruption event from a stellar fly-by or planetary perturbations altered the disk density- Esposito et al. (submitted to ApJ, 2016) combined Keck NIRC2 data taken at 1.2-2.3 microns and GPI 1.6 micron total intensity and polarized light detections that probes down to projected separations less than 10 AU to show that the HD

  4. Protein's native state stability in a chemically induced denaturation mechanism.


    Olivares-Quiroz, L; Garcia-Colin, L S


    In this work, we present a generalization of Zwanzig's protein unfolding analysis [Zwanzig, R., 1997. Two-state models of protein folding kinetics. Proc. Natl Acad. Sci. USA 94, 148-150; Zwanzig, R., 1995. Simple model of protein folding kinetics. Proc. Natl Acad. Sci. USA 92, 9801], in order to calculate the free energy change Delta(N)(D)F between the protein's native state N and its unfolded state D in a chemically induced denaturation. This Extended Zwanzig Model (EZM) is both based on an equilibrium statistical mechanics approach and the inclusion of experimental denaturation curves. It enables us to construct a suitable partition function Z and to derive an analytical formula for Delta(N)(D)F in terms of the number K of residues of the macromolecule, the average number nu of accessible states for each single amino acid and the concentration C(1/2) where the midpoint of the N<==>D transition occurs. The results of the EZM for proteins where chemical denaturation follows a sigmoidal-type profile, as it occurs for the case of the T70N human variant of lysozyme (PDB code: T70N) [Esposito, G., et al., 2003. J. Biol. Chem. 278, 25910-25918], can be splitted into two lines. First, EZM shows that for sigmoidal denaturation profiles, the internal degrees of freedom of the chain play an outstanding role in the stability of the native state. On the other hand, that under certain conditions DeltaF can be written as a quadratic polynomial on concentration C(1/2), i.e., DeltaF approximately aC(1/2)(2)+bC(1/2)+c, where a,b,c are constant coefficients directly linked to protein's size K and the averaged number of non-native conformations nu. Such functional form for DeltaF has been widely known to fit experimental measures in chemically induced protein denaturation [Yagi, M., et al., 2003. J. Biol. Chem. 278, 47009-47015; Asgeirsson, B., Guojonsdottir, K., 2006. Biochim. Biophys. Acta 1764, 190-198; Sharma, S., et al., 2006. Protein Pept. Lett. 13(4), 323-329; Salem, M., et

  5. Waves in Cassini UVIS stellar occultations. 2. The C ring

    NASA Astrophysics Data System (ADS)

    Baillié, Kévin; Colwell, Joshua E.; Lissauer, Jack J.; Esposito, Larry W.; Sremčević, Miodrag


    We performed a complete wavelet analysis of Saturn's C ring on 62 stellar occultation profiles. These profiles were obtained by Cassini's Ultraviolet Imaging Spectrograph High Speed Photometer. We used a WWZ wavelet power transform to analyze them. With a co-adding process, we found evidence of 40 wavelike structures, 18 of which are reported here for the first time. Seventeen of these appear to be propagating waves (wavelength changing systematically with distance from Saturn). The longest new wavetrain in the C ring is a 52-km-long wave in a plateau at 86,397 km. We produced a complete map of resonances with external satellites and possible structures rotating with Saturn's rotation period up to the eighth order, allowing us to associate a previously observed wave with the Atlas 2:1 inner Lindblad resonance (ILR) and newly detected waves with the Mimas 6:2 ILR and the Pandora 4:2 ILR. We derived surface mass densities and mass extinction coefficients, finding σ = 0.22(±0.03) g cm -2 for the Atlas 2:1 ILR, σ = 1.31(±0.20) g cm -2 for the Mimas 6:2 ILR, and σ = 1.42(±0.21) g cm -2 for the Pandora 4:2 ILR. We determined a range of mass extinction coefficients ( κ = τ/ σ) for the waves associated with resonances with κ = 0.13 (±0.03) to 0.28(±0.06) cm 2 g -1, where τ is the optical depth. These values are higher than the reported values for the A ring (0.01-0.02 cm 2 g -1) and the Cassini Division (0.07-0.12 cm 2 g -1 from Colwell et al. (Colwell, J.E., Cooney, J.H., Esposito, L.W., Sremčević, M. [2009]. Icarus 200, 574-580)). We also note that the mass extinction coefficient is probably not constant across the C ring (in contrast to the A ring and the Cassini Division): it is systematically higher in the plateaus than elsewhere, suggesting smaller particles in the plateaus. We present the results of our analysis of these waves in the C ring and estimate the mass of the C ring to be between3.7(±0.9) × 10 16 kg and 7.9(±2.0) × 10 16 kg (equivalent

  6. Gap Assessment (FY 13 Update)

    DOE Data Explorer

    Getman, Dan


    To help guide its future data collection efforts, The DOE GTO funded a data gap analysis in FY2012 to identify high potential hydrothermal areas where critical data are needed. This analysis was updated in FY2013 and the resulting datasets are represented by this metadata. The original process was published in FY 2012 and is available here: Though there are many types of data that can be used for hydrothermal exploration, five types of exploration data were targeted for this analysis. These data types were selected for their regional reconnaissance potential, and include many of the primary exploration techniques currently used by the geothermal industry. The data types include: 1. well data 2. geologic maps 3. fault maps 4. geochemistry data 5. geophysical data To determine data coverage, metadata for exploration data (including data type, data status, and coverage information) were collected and catalogued from nodes on the National Geothermal Data System (NGDS). It is the intention of this analysis that the data be updated from this source in a semi-automated fashion as new datasets are added to the NGDS nodes. In addition to this upload, an online tool was developed to allow all geothermal data providers to access this assessment and to directly add metadata themselves and view the results of the analysis via maps of data coverage in Geothermal Prospector ( A grid of the contiguous U.S. was created with 88,000 10-km by 10-km grid cells, and each cell was populated with the status of data availability corresponding to the five data types. Using these five data coverage maps and the USGS Resource Potential Map, sites were identified for future data collection efforts. These sites signify both that the USGS has indicated high favorability of occurrence of geothermal resources and that data gaps exist. The uploaded data are contained in two data files for

  7. Cassini UVIS Observations of Titan Ultraviolet Airglow Spectra with Laboratory Modeling from Electron- and Proton-Excited N2 Emission Studies

    NASA Astrophysics Data System (ADS)

    Ajello, J. M.; West, R. A.; Malone, C. P.; Gustin, J.; Esposito, L. W.; McClintock, W. E.; Holsclaw, G. M.; Stevens, M. H.


    Joseph M. Ajello, Robert A. West, Rao S. Mangina Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 Charles P. Malone Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 & Department of Physics, California State University, Fullerton, CA 92834 Michael H. Stevens Space Science Division, Naval Research Laboratory, Washington, DC 20375 Jacques Gustin Laboratoire de Physique Atmosphérique et Planétaire, Université de Liège, Liège, Belgium A. Ian F. Stewart, Larry W. Esposito, William E. McClintock, Gregory M. Holsclaw Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 E. Todd Bradley Department of Physics, University of Central Florida, Orlando, FL 32816 The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed photon emissions of Titan's day and night limb-airglow and disk-airglow on multiple occasions, including three eclipse observations from 2009 through 2010. The 77 airglow observations analyzed in this paper show EUV (600-1150 Å) and FUV (1150-1900 Å) atomic multiplet lines and band emissions (lifetimes less than ~100 μs), including the Lyman-Birge-Hopfield (LBH) band system, arising from photoelectron induced fluorescence and solar photo-fragmentation of molecular nitrogen (N2). The altitude of peak UV emission on the limb of Titan during daylight occurred inside the thermosphere/ionosphere (near 1000 km altitude). However, at night on the limb, the same emission features, but much weaker in intensity, arise in the lower atmosphere below 1000 km (lower thermosphere, mesosphere, haze layer) extending downwards to near the surface at ~300 km, possibly resulting from proton- and/or heavier ion-induced emissions as well as secondary-electron-induced emissions. The eclipse observations are unique. UV emissions were observed during only one of the three eclipse events, and no Vegard-Kaplan (VK) or LBH emissions were seen. Through regression analysis using

  8. EDITORIAL: Quantum phenomena in Nanotechnology Quantum phenomena in Nanotechnology

    NASA Astrophysics Data System (ADS)

    Loss, Daniel


    of quantum cellular automata, a new paradigm for computing as reported by Craig S Lent and colleagues (Lent C S, Tougaw P D, Porod W and Bernstein G H 1993 Nanotechnology 4 49-57). The increasingly sophisticated manipulation of spin has been an enduring theme of research throughout this decade, providing a number of interesting developments such as spin pumping (Cota E, Aguado R, Creffield C E and Platero G 2003 Nanotechnology 14 152-6). The idea of spin qubits, proposed by D Loss and D P DiVincenzo (1998 Phys. Rev. A 57 120), developed into an established option for advancing research in quantum computing and continues to drive fruitful avenues of research, such as the integrated superconductive magnetic nanosensor recently devised by researchers in Italy (Granata C, Esposito E, Vettoliere A, Petti L and Russo M 2008 Nanotechnology 19 275501). The device has a spin sensitivity in units of the Bohr magneton of 100 spin Hz-1/2 and has large potential for applications in the measurement of nanoscale magnetization and quantum computing. The advance of science and technology at the nanoscale is inextricably enmeshed with advances in our understanding of quantum effects. As Nanotechnology celebrates its 20th volume, research into fundamental quantum phenomena continues to be an active field of research, providing fertile pasture for developing nanotechnologies.

  9. Thermal structure and CO distribution for the Venus mesosphere/lower thermosphere: 2001-2009 inferior conjunction sub-millimeter CO absorption line observations

    NASA Astrophysics Data System (ADS)

    Clancy, R. Todd; Sandor, Brad J.; Moriarty-Schieven, Gerald


    . Geophys. Res. 113, E00B02. doi:10.1029/2008JE003081) and upper mesospheric SO and SO 2 layers (Sandor, B.J., Clancy, R.T., Moriarty-Schieven, G.H., Mills, F.P. [2010]. Icarus 208, 49-60). The retrieved temperature profiles also exhibit 20 K long-term (2001-2009) variations in nightside (whole disk) average mesospheric (80-95 km) temperatures, similar to 1982-1991 variations identified in previous millimeter CO line observations (Clancy et al., 1991). Global average diurnal variations in lower thermospheric temperatures and mesospheric CO abundances decreased by a factor-of-two between 2000-2002 versus 2007-2009 periods of combined dayside and nightside observations. The infrequency and still limited temporal extent of the observations make it difficult to assign specific timescales to such longer term variations, which may be associated with longer term variations observed for cloud top SO 2 (Esposito, L.W., Bertaux, J.-L., Krasnopolsky, V., Moroz, V.I., Zasova, L.V. [1997]. Chemistry of lower atmosphere and clouds. In: Bougher, S.W., Hunten, D.M., Phillips, R.J. (Eds.), VENUS II, 1362pp) and mesospheric water vapor (Sandor, B.J., Clancy, R.T. [2005]. Icarus 177, 129-143) abundances.

  10. DREAMS: a payload on-board the ExoMars EDM Schiaparelli for the characterization of Martian environment during the statistical dust storm season

    NASA Astrophysics Data System (ADS)

    Molfese, Cesare; Esposito, Francesca; Debei, Stefano; Bettanini, Carlo; Arruego Rodríguez, Ignacio; Colombatti, Giacomo; Harri, Ari-Matty.; Montmessin, Franck; Wilson, Colin; Aboudan, Alessio; Mugnuolo, Raffaele; Pirrotta, Simone; Marchetti, Ernesto; Witasse, Olivier


    F. Esposito1, S. Debei2, C. Bettanini2, C. Molfese1, I. Arruego Rodríguez3, G. Colombatti2, A-M. Harri4, F. Montmessin5, C. Wilson6, A. Aboudan2, S. Abbaki5, V. Apestigue3, G. Bellucci7, J-J. Berthelier5, J. R. Brucato8, S. B. Calcutt6, F. Cortecchia1, F. Cucciarrè2, G. Di Achille1, F. Ferri2, F. Forget9, E. Friso2, M. Genzer4, P. Gilbert5, H. Haukka4, J. J. Jiménez3, S. Jiménez10, J-L. Josset11, O. Karatekin12, G. Landis13, R. Lorenz14, J. Martinez3, L. Marty1, V. Mennella1, D. Möhlmann15, D. Moirin5, R. Molinaro1, E. Palomba7, M. Patel16, J-P. Pommereau5, C.I. Popa1, S. Rafkin17, P. Rannou18, N.O. Renno19, P. Schipani1, W. Schmidt4, E. Segato2, S. Silvestro1, F. Simoes20, A. Spiga9, F. Valero21, L. Vázquez21, F. Vivat5, O. Witasse22, R. Mugnuolo23, S. Pirrotta23, E.Marchetti23 1INAF - Osservatorio Astronomico di Capodimonte, Napoli, Italy, 2CISAS - Università degli Studi di Padova, Padova, Italy, 3INTA, Spain, 4Finnish Meteorological Institute (FMI),Helsinki, Finland, 5LATMOS - CNRS/UVSQ/IPSL, France, 6Oxford University, Oxford, United Kingdom, 7INAF - Istituto di Fisica dello Spazio Interplanetario (IFSI), 8INAF-Osservatorio Astrofisico di Arcetri, 9CNRS, LMD, France, 10Universidad Politécnica de Madrid, Spain, 11Space Exploration Institute, Switzerland, 12Royal Observatory of Belgium,Belgium, 13NASA, GRC, USA, 14JHU Applied Physics Lab (JHU-APL), USA, 15DLR PF Leitungsbereich, Berlin, Germany, 16Open University, UK, 17SwRL, Switzerland, 18GSMA, France, 19University of Michigan, USA, 20NASA, GSFC, USA, 21Universidad Complutense de Madrid (UCM), Spain, 22ESA-ESTEC, Noordwijk, The Netherlands, 23Italian Space Agency, Italy DREAMS (Dust characterization, Risk assessment and Environment Analyzer on the Martian Surface) package is an integrated multi-sensor scientific payload dedicated to characterizing the landing site environment in dusty conditions. It will measure pressure, wind speed and direction, relative humidity, temperature, the solar irradiance

  11. PREFACE: Strongly Coupled Coulomb Systems Strongly Coupled Coulomb Systems

    NASA Astrophysics Data System (ADS)

    Neilson, David; Senatore, Gaetano


    , condensed matter and ultra-cold plasmas. One hundred and thirty participants came from twenty countries and four continents to participate in the conference. Those giving presentations were asked to contribute to this special issue to make a representative record of an interesting conference. We thank the International Advisory Board and the Programme Committee for their support and suggestions. We thank the Local Organizing Committee (Stefania De Palo, Vittorio Pellegrini, Andrea Perali and Pierbiagio Pieri) for all their efforts. We highlight for special mention the dedication displayed by Andrea Perali, by Rocco di Marco for computer support, and by our tireless conference secretary Fiorella Paino. The knowledgeable guided tour of the historic centre of Camerino given by Fiorella Paino was appreciated by many participants. It is no exaggeration to say that without the extraordinary efforts put in by these three, the conference could not have been the success that it was. For their sustained interest and support we thank Fulvio Esposito, Rector of the University of Camerino, Fabio Beltram, Director of NEST, Scuola Normale Superiore, Pisa, and Daniel Cox, Co-Director of ICAM, University of California at Davis. We thank the Institute of Complex and Adaptive Matter ICAM-I2CAM, USA for providing a video record of the conference on the web (found at Finally we thank the conference sponsors for their very generous support: the University of Camerino, the Institute of Complex and Adaptive Matter ICAM-I2CAM, USA, the International Centre for Theoretical Physics ICTP Trieste, and CNR-INFM DEMOCRITOS Modeling Center for Research in Atomistic Simulation, Trieste. Participants at the International Conference on Strongly Coupled Coulomb Systems (SCCS) (University of Camerino, Italy, 29 July-2 August 2008).

  12. Testing and ground calibration of DREAMS-H relative humidity device

    NASA Astrophysics Data System (ADS)

    Genzer, Maria; Hieta, Maria; Nikkanen, Timo; Schmidt, Walter; Kemppinen, Osku; Harri, Ari-Matti; Haukka, Harri


    were measured at several temperature points between 0°C and -70°C. Dry baseline was established in vacuum measurements at the Finnish Meteorological Institute. In addition to stable relative humidity points, measurements in changing relative humidity and temperature were done in order to get information about the lag of the sensor. References: 1] Esposito, F. et al: The DREAMS Experiment on the ExoMars 2016 Mission for the Study of Martian Environment during the Dust Storm Season, The Fifth International Workshop on the Mars Atmosphere, 13-16 January 2014, Oxford, UK, 2014. [2] Gómez-Elvira, J. et al.: REMS: The Environmental Sensor Suite for the Mars Science Laboratory Rover, Space Sci. Rev., 170, pp. 583-640, 2012. [3] Harri, A.-M. et al.: Mars Science Laboratory Relative Humidity Observations - Initial Results, JGR Planets, Vol 119 Issue 9, pp. 2132-2147, 2014.

  13. Seismically induced environmental effects in costal areas : the 1783, 1905 and 1908 earthquakes in Calabria and Sicily, (Southern Italy).

    NASA Astrophysics Data System (ADS)

    Porfido, S.; Esposito, E.; Violante, C.; Sacchi, M.; Guerrieri, L.; Serva, L.; Sciarrotta, S.


    important to consider the seismically induced effects with the aim to reduce the future risk for the population living along the cost and the potential damage to structures and natural environment, through a more precise estimate of their type, size and distribution. References .Barbano M. S.(2008), Il terremoto del 1908: effetti nei centri abitati. Oral presentation. Convegno "Cento anni dopo il terremoto del 1908" ISPRA- 12-13 Novembre 2008 Messina-Villa San Giovanni. .Bozzano, F., Chiocci, F.L., Mazzanti, P., Bosman, C., Casalbore, D., Giuliani,R., Martino, S., Prestininzi, A. & Scarascia Mugnozza G.(2006). Subaerial and submarine characterisation of the landslide responsible for the 1783 Scilla tsunami. EGU 2006, Geophysical Res. Abstracts, 8, 10422. .Graziani, L., Maramai, A. & Tinti, S., 2006b. A revision of the 1783 Calabrian (southern Italy) tsunamis. Natural Hazard and Earth System Sciences, 6, 1053-1060. .Porfido S., Esposito E., Guerrieri L., Serva L., (2008). Terremoti storici ed effetti ambientali nell'area dello stretto. Oral presentation. Convegno "Cento anni dopo il terremoto del 1908" ISPRA -12-13 Novembre 2008 Messina-Villa San Giovanni.

  14. Multi-scale electromagnetic imaging of the Monte Aquila Fault (Agri Valley, Southern Italy)

    NASA Astrophysics Data System (ADS)

    Giocoli, Alessandro; Piscitelli, Sabatino; Romano, Gerardo; Balasco, Marianna; Lapenna, Vincenzo; Siniscalchi, Agata


    conclusion, taking into account all the above inferences, we think that suitable multi-scale electromagnetic approach has proved to be affective for MAF detection, giving valuable data to the seismic hazard assessment of the region. References Branno A., E.G.I. Esposito, A. Maturano, S. Porfido and V. Rinaldis (1985): Studio, su base macrosismica, del terremoto della Basilicata del 16 dicembre 1857. Bollettino della Società dei Naturalisti di Napoli, 1985, 92, 249-338. Maschio L., L. Ferranti and P. Burrato (2005): Active extension in Val d'Agri area, Southern Apennines, Italy: implications for the geometry of the seismogenic belt. Geophys. J. Int., 162 (2), 591-609, doi:10.1111/j.1365-246X.2005.02597.x. Burrato P., and G. Valensise (2007): Rise and fall of a hypothesized seismic gap: source complexity in the 16 December 1857, Southern Italy earthquake (Mw 7.0). Bull. Seism. Soc. Am., 98 (1), 139-148, doi: 10.1785/0120070094.

  15. Scattering properties of Saturn's rings in the far ultraviolet from Cassini UVIS spectra

    NASA Astrophysics Data System (ADS)

    Bradley, E. Todd; Colwell, Joshua E.; Esposito, Larry W.


    We use Cassini UVIS data to determine the scattering properties of Saturn's ring particles in the FUV. We have replaced the scattering function from the classical Chandrasekhar single scattering radiative transfer equation for reflectance with a ring wake model for the A and B rings derived from stellar occultations. The free parameters in this model are the ring particle Bond albedo, AB, and the ring particle asymmetry parameter, g, which equals the cosine of the most probable scattering angle of a photon from a ring particle. The spectrum of Saturn's rings from 140 to 190 nm shows an absorption feature due to water ice shortward of 165 nm. We compare our model values for I/F to lit-side data at 155 nm and at 180 nm for regions in both the A and B rings. We used the unmodified Chandrasekhar model for the C ring and Cassini Division, and in all cases we determined AB and g in the FUV for the first time. Values of AB vary between 0.04 and 0.091 at 180 nm and between 0.012 and 0.019 at 155 nm. The variations across the ring of AB at 180 nm is consistent with a greater abundance of non-ice contaminant in the C ring and Cassini Division and a minimum in contaminant abundance in the outer B ring. There is little variation in AB at 155 nm across the rings, which suggests that the reflectance of the water ice and non-water ice material shortward of the 165 nm absorption edge are about the same. Values of g vary between -0.68 and -0.78 at 180 nm and between -0.63 and -0.77 at 155 nm showing that the ring particles are highly backscattering in the FUV. We find that the wavelength of the absorption feature varies with ring region and viewing geometry indicating a different photon mean path length, L, through the outer layer of the ring particle (Bradley, E.T., Colwell, J.E., Esposito, L.W., Cuzzi, J.N., Tollerud, H., Chambers, L. [2010]. Icarus 206 (2), 458-466). We compared I/F from 152 to 185 nm to a radiative transfer spectral model developed by Shkuratov et al

  16. Effets Josephson generalises entre antiferroaimants et entre supraconducteurs antiferromagnetiques

    NASA Astrophysics Data System (ADS)

    Chasse, Dominique

    L'effet Josephson est generalement presente comme le resultat de l'effet tunnel coherent de paires de Cooper a travers une jonction tunnel entre deux supraconducteurs, mais il est possible de l'expliquer dans un contexte plus general. Par exemple, Esposito & al. ont recemment demontre que l'effet Josephson DC peut etre decrit a l'aide du boson pseudo-Goldstone de deux systemes couples brisant chacun la symetrie abelienne U(1). Puisque cette description se generalise de facon naturelle a des brisures de symetries continues non-abeliennes, l'equivalent de l'effet Josephson devrait donc exister pour des types d'ordre a longue portee differents de la supraconductivite. Le cas de deux ferroaimants itinerants (brisure de symetrie 0(3)) couples a travers une jonction tunnel a deja ete traite dans la litterature Afin de mettre en evidence la generalite du phenomene et dans le but de faire des predictions a partir d'un modele realiste, nous etudions le cas d'une jonction tunnel entre deux antiferroaimants itinerants. En adoptant une approche Similaire a celle d'Ambegaokar & Baratoff pour une jonction Josephson, nous trouvons un courant d'aimantation alternee a travers la jonction qui est proportionnel a sG x sD ou fG et sD sont les vecteurs de Neel de part et d'autre de la jonction. La fonction sinus caracteristique du courant Josephson standard est donc remplacee.ici par un produit vectoriel. Nous montrons que, d'un point de vue microscopique, ce phenomene resulte de l'effet tunnel coherent de paires particule-trou de spin 1 et de vecteur d'onde net egal au vecteur d'onde antiferromagnetique Q. Nous trouvons egalement la dependance en temperature de l'analogue du courant critique. En presence d'un champ magnetique externe, nous obtenons l'analogue de l'effet Josephson AC et la description complete que nous en donnons s'applique aussi au cas d'une jonction tunnel entre ferroaimants (dans ce dernier cas, les traitements anterieurs de cet effet AC s'averent incomplets). Nous

  17. PREFACE: Water Interfaces in Physics Chemistry and Biology: a multi-disciplinary approach

    NASA Astrophysics Data System (ADS)

    Bellissent-Funel, Marie-Claire; Dore, John


    meeting as well as five extended abstracts. 1. Initial Filling Mechanism of Predominant Water Adsorption on Hydrophobic Slit-Shaped Carbon Nanopores Tomonori Ohba and Katsumi Kaneko 2. Computer simulation study of water/hydrocarbon interfaces: effects of hydrocarbon branching on interfacial properties Janamejaya Chowdhary and Branka M Ladanyi 3. Thermodynamics of supercooled water in solutions D Corradini, P Gallo and M Rovere 4. Transferability of polarizable models for ion-water electrostatic interaction Marco Masia 5. Quantum chemical study of water impact on the calcium hydroxyapatite V D Khavryuchenko, O V Khavryuchenko, V V Lisnyak 6. Neutron Scattering Studies of Dynamic Crossover Phenomena in a Coupled System of Biopolymer and Its Hydration Water Sow-Hsin Chen, F Mallamace, X Q Chu, C Kim, M Lagi, A Faraone, E Fratini, P Baglioni 7. Looking for the best experimental conditions to detail the protein solvation shell in a binary aqueous solvent via Small Angle Scattering Maria Grazia Ortore, Raffaele Sinibaldi, Francesco Spinozzi, Andrea Carbini, Flavio Carsughi and Paolo Mariani 8. Influence of the water molecules near surface of viral protein on virus activation process S O Shepelenko, A S Salnikov, S V Rak, E P Goncharova and A B Ryzhikov 9. Optical Kerr effect measurements on supercooled water: the experimental perspectives P. Bartolini, A Taschin, R Eramo, R Righini and R Torre 10. Structural studies of water confined in a confined hydrophobic environment J C Dore, M-C Bellissent-Funel, A Burian, H P Castricum, J Jelassi, K Kaneko, T Ohba, H Tanaka and J B W Webber 11. Dynamic transition and glassy behaviour in hydrated proteins F Mezei, M Russina, G Chen, H Frauenfelder, P W Fenimore, P Falus and B Farago 12. Relation between frequency and H bond length in heavy water: Towards the understanding of the unusual properties of H bond dynamics in nanoporous media S Pommeret, R Musat, J-P Renault, J-C Leicknam and S Bratos 13. Quantum confinement of hydrogen in ice

  18. PREFACE: 17th International Conference on the Physics of Highly Charged Ions

    NASA Astrophysics Data System (ADS)


    sources and Roberto Garibotti, for his help with the edition of the book of abstracts. We thank Lynn van Brook for her work as conference secretary, and Silvana Peralta and Natalia Mastrángelo, for the web development and graphic design. Finally, we express our acknowledgements to the scientists that participated during the refereeing process of the present Proceedings. Raúl Barrachina Flavio Colavecchia Roberto Rivarola Local Chairs, HCI 2014 December 2014

  19. 3D displacements maps of the L'Aquila earthquake by applying SISTEM method to GPS and ENVISAT and ALOS DInSAR data

    NASA Astrophysics Data System (ADS)

    Guglielmino, Francesco; Anzidei, Marco; Briole, Pierre; de Michele, Marcello; Elias, Panagiotis; Nunnari, Giuseppe; Puglisi, Giuseppe; Spata, Alessandro


    ). We also analyzed ALOS PALSAR interferograms produced with images acquired along two different ascending tracks and relevant to the 3/7/2008 - 21/5/2009 time interval (track 638; tbline = 322 days; Bperp = 665 m ) and 2/3/2007 - 22/4/2009 time interval (track 639; tbline = 782 days; Bperp = 466 m ). In order to derive 3D surface motion maps, we apply the SISTEM method to the available geodetic dataset (both GPS and DInSAR). The SISTEM method performs an integration of GPS and DInSAR data for computing displacements on each point of the studied area. The SISTEM is based on elastic theory, and provides the complete 3D strain and the rigid body rotation tensors in the same solution. To achieve higher accuracy and get better the constraint of the 3D components of the displacements, we improved the standard formulation of SISTEM approach, based on a single DInSAR data, in order to take into account both ascending and descending interferograms and the DInSAR data acquired by different sensors(ALOS and ENVISAT). The SISTEM integration results show a complex kinematics, where the main movements (max westward movement of 165 mm associated with a max lowering of 260 mm) are recorded in the area between the surface evidence of the Paganica fault and Monticchio-fossa fault. These results, which provide both accurate and fine spatial characterization of ground deformation, are hence promising for future studies aimed at improving the knowledge of the kinematic of the Paganica fault and identification of additional faults responsible of the seismic sequence and that have contributed to the observed ground deformation. References. Anzidei, M., P. Baldi, A. Pesci, A. Esposito, A. Galvani, F. Loddo, P. Cristofoletti, A. Massucci, and S. Del Mese (2005), Geodetic deformation across the Central Apennines from GPS data in the time span 1999-2003, Ann. Geophys., 48(2), 259-271. Boschi, E., E. Guidoboni, G. Ferrrari, D. Mariotti, G. Valensise, and P. Gasperini (2000), Catalogue of strong

  20. The period from the Last Interglacial to the Last Glacial Maximum (MIS 5 - 2) in different archives of southern Italy

    NASA Astrophysics Data System (ADS)

    Sauer, Daniela; Wagner, Stephen; Al-Sharif, Riyad; Brückner, Helmut; Scarciglia, Fabio; Mastronuzzi, Giuseppe; Stahr, Karl


    to the sea level, in lagoonal to alluvial environments. There are only few age estimates available. Several shells from the lower terraces are currently being dated. A Calcic Luvisol developed on the terrace T1 (terminology according to Brückner, 1980), which is attributed to MIS 5.1. The next higher terraces T2 and T3 are characterised by progressive soil evolution, in particular increasing rubification and clay translocation. In some locations, loess accumulated on the terraces, as observed in the profile Petrulla on T1. According to OSL datings by Zander et al. (2006), the loess at this site accumulated between 24.9 ka BP and <16 ka BP, i.e. during the LGM. A yellowish-brown Calcic Luvisol developed in the loess. Thus, the soils reflect rather the interglacial soil formation in a Mediterranean environment than the glacial soil formation in a steppe environment. References Allen, J.R.M., Watts, W.A., Huntley, B. (2000): Weichelian palynostratigraphy, palaeovegetation and palaeoenvironment; the record from Lago Grande di Monticchio, southern Italy. Quaternary International, 73/74: 91-110. Brückner, H., 1980. Marine Terrassen in Süditalien. Eine quartärmorphologische Studie über das Küstentiefland von Metapont. Düsseldorfer Geographische Schriften, 14, 235 p. Di Donato, V., Esposito, P., Russo-Ermolli, E., Scarano, A., Cheddadi, R. (2008): Coupled atmospheric and marine palaeoclimatic reconstruction for the last 35 ka in the Sele Plain - Gulf of Salerno area (southern Italy). Quaternary International, 190: 146-157. Follieri, M., Giardini, M., Magri, D., Sadori, L. (1998): Palynostratigraphy of the last glacial period in the volcanic region of central Italy. Quaternary International, 47/48: 3-20. Zander, A., Fülling, A., Brückner, H. & Mastronuzzi, G. (2006): OSL dating of Upper Pleistocene littoral sediments: a contribution to the chronostratigraphy of raised marine terraces bordering the Gulf of Taranto, South Italy. Geografia Fisica e Dinamica Quaternaria

  1. EDITORIAL: Ice in the environment: connections to atmospheric chemistry Ice in the environment: connections to atmospheric chemistry

    NASA Astrophysics Data System (ADS)

    McNeill, V. Faye; Hastings, Meredith G.


    understanding of the atmospheric chemistry of ice: the role of a quasi-liquid layer (QLL) or quasi-brine layer (QBL) at the ice surface. The studies presented here advance our understanding of the complex interactions of snow and ice with important reactive components in our atmosphere. It has become clear in recent years that the polar regions do not act as an ultimate sink for many compounds—the release of halogens and reactive nitrogen oxides from ice and snow are examples of this. Two notable implications arise from these findings (i) the impact of anthropogenic pollutants in our environment may extend further than we fully appreciate with current global atmospheric chemistry models and (ii) our interpretation of chemical records in ice cores requires that we fundamentally understand and quantify air-snow and air-ice interactions. Additionally, laboratory studies are elucidating the details of heterogeneous reactions that are prevalent on ice and snow surfaces throughout the troposphere, and we are poised to make significant strides in the near future quantifying these effects on regional and global scales. We look forward to continued progress in this field in the coming years, and we will continue to work to connect those conducting modeling, field and laboratory studies. Focus on Connections between Atmospheric Chemistry and Snow and Ice Contents HONO emissions from snow surfaces Harry Beine, Agustín J Colussi, Antonio Amoroso, Giulio Esposito, Mauro Montagnoli and Michael R Hoffmann Heterogeneous ozonation kinetics of phenanthrene at the air-ice interface T F Kahan and D J Donaldson Release of gas-phase halogens from sodium halide substrates: heterogeneous oxidation of frozen solutions and desiccated salts by hydroxyl radicals S J Sjostedt and J P D Abbatt Uptake of acetone, ethanol and benzene to snow and ice: effects of surface area and temperature J P D Abbatt, T Bartels-Rausch, M Ullerstam and T J Ye Interaction of gaseous elemental mercury with snow surfaces

  2. Jupiter

    NASA Astrophysics Data System (ADS)

    Bagenal, Fran; Dowling, Timothy E.; McKinnon, William B.


    Preface; 1. Introduction F. Bagenal, T. E. Dowling and W. B. McKinnon; 2. The origin of Jupiter J. I. Lunine, A. Corandini, D. Gautier, T. C. Owen and G. Wuchterl; 3. The interior of Jupiter T. Guillot, D. J. Stevenson, W. B. Hubbard and D. Saumon; 4. The composition of the atmosphere of Jupiter F. W. Taylor, S. K. Atreya, Th. Encrenaz, D. M. Hunten, P. G. J. Irwin and T. C. Owen; 5. Jovian clouds and haze R. A. West, K. H. Baines, A. J. Friedson, D. Banfield, B. Ragent and F. W. Taylor; 6. Dynamics of Jupiter's atmosphere A. P. Ingersoll, T. E. Dowling, P. J. Gierasch, G. S. Orton, P. L. Read, A. Sánchez-Lavega, A. P. Showman, A. A. Simon-Miller and A. R. Vasavada; 7. The stratosphere of Jupiter J. I. Moses, T. Fouchet, R. V. Yelle, A. J. Friedson, G. S. Orton, B. Bézard, P. Drossart, G. R. Gladstone, T. Kostiuk and T. A. Livengood; 8. Lessons from Shoemaker-Levy 9 about Jupiter and planetary impacts J. Harrington, I. de Pater, S. H. Brecht, D. Deming, V. Meadows, K. Zahnle and P. D. Nicholson; 9. Jupiter's thermosphere and ionosphere R. V. Yelle and S. Miller; 10. Jovian dust: streams, clouds and rings H. Krüger, M. Horányi, A. V. Krivov and A. L. Graps; 11. Jupiter's ring-moon system J. A. Burns, D. P. Simonelli, M. R. Showalter, D. P. Hamilton, C. C. Porco, H. Throop and L. W. Esposito; 12. Jupiter's outer satellites and trojans D. C. Jewitt, S. Sheppard and C. Porco; 13. Interior composition, structure and dynamics of the Galilean satellites G. Schubert, J. D. Anderson, T. Spohn and W. B. McKinnon; 14. The lithosphere and surface of Io A. S. McEwen, L. P. Keszthelyi, R. Lopes, P. M. Schenk and J. R. Spencer; 15. Geology of Europa R. Greeley, C. F. Chyba, J. W. Head III, T. B. McCord, W. B. McKinnon, R. T. Pappalardo and P. Figueredo; 16. Geology of Ganymede R. T. Pappalardo, G. C. Collins, J. W. Head III, P. Helfenstein, T. B. McCord, J. M. Moore, L. M. Procktor, P. M. Shenk and J. R. Spencer; 17. Callisto J. M. Moore, C. R. Chapman. E. B. Bierhaus, R

  3. 10 years of mapping the icy saturnian satellites

    NASA Astrophysics Data System (ADS)

    Roatsch, Thomas; Kersten, Elke; Matz, Klaus-Dieter; Porco, Carolyn


    anticipated scientific investigations at saturn, Space Science Re-view 115, 363-497. [2] Roatsch et al., 2006, Mapping of the icy Saturnian satellites: first results from Cassi-ni-ISS, Planetary Space Sciences 54, 1137-1145. [3] Archinal et al., 2011, Report of the IAU working group on cartographic coordinates and rotational elements: 2009. Celestial Mechanics and Dynamical Astronomy 109, 101-135. [4] Roatsch et al., 2009, Cartographic mapping of the icy satellites using ISS and VIMS data. In: Dougherty, M.K., Esposito, L.W., Krimigis, S.M. (Eds.), Saturn from Cassini-Huygens. Springer, NY, pp. 763-782. [5] Greeley and Batson, 1990, Planetary Mapping, Cambridge University Press, Cambridge.

  4. Moonlet induced wakes in planetary rings: Analytical model including eccentric orbits of moon and ring particles

    NASA Astrophysics Data System (ADS)

    Seiß, M.; Spahn, F.; Schmidt, Jürgen


    Saturn's rings host two known moons, Pan and Daphnis, which are massive enough to clear circumferential gaps in the ring around their orbits. Both moons create wake patterns at the gap edges by gravitational deflection of the ring material (Cuzzi, J.N., Scargle, J.D. [1985]. Astrophys. J. 292, 276-290; Showalter, M.R., Cuzzi, J.N., Marouf, E.A., Esposito, L.W. [1986]. Icarus 66, 297-323). New Cassini observations revealed that these wavy edges deviate from the sinusoidal waveform, which one would expect from a theory that assumes a circular orbit of the perturbing moon and neglects particle interactions. Resonant perturbations of the edges by moons outside the ring system, as well as an eccentric orbit of the embedded moon, may partly explain this behavior (Porco, C.C., and 34 colleagues [2005]. Science 307, 1226-1236; Tiscareno, M.S., Burns, J.A., Hedman, M.M., Spitale, J.N., Porco, C.C., Murray, C.D., and the Cassini Imaging team [2005]. Bull. Am. Astron. Soc. 37, 767; Weiss, J.W., Porco, C.C., Tiscareno, M.S., Burns, J.A., Dones, L. [2005]. Bull. Am. Astron. Soc. 37, 767; Weiss, J.W., Porco, C.C., Tiscareno, M.S. [2009]. Astron. J. 138, 272-286). Here we present an extended non-collisional streamline model which accounts for both effects. We describe the resulting variations of the density structure and the modification of the nonlinearity parameter q. Furthermore, an estimate is given for the applicability of the model. We use the streamwire model introduced by Stewart (Stewart, G.R. [1991]. Icarus 94, 436-450) to plot the perturbed ring density at the gap edges. We apply our model to the Keeler gap edges undulated by Daphnis and to a faint ringlet in the Encke gap close to the orbit of Pan. The modulations of the latter ringlet, induced by the perturbations of Pan (Burns, J.A., Hedman, M.M., Tiscareno, M.S., Nicholson, P.D., Streetman, B.J., Colwell, J.E., Showalter, M.R., Murray, C.D., Cuzzi, J.N., Porco, C.C., and the Cassini ISS team [2005]. Bull. Am

  5. Is the April 6th 2009 L'Aquila earthquake a confirmation of the "seismic landscape" concept?

    NASA Astrophysics Data System (ADS)

    Blumetti, Anna Maria; Comerci, Valerio; Guerrieri, Luca; Michetti, Alessandro Maria; Serva, Leonello; Vittori, Eutizio


    -generated mountain fronts in Central Apennines (Central Italy); geomorphological features and seismotectonic implications. Earth Surface Processes and Landforms, 18, 203-223. Blumetti A.M. (1995) - Neotectonic investigations and evidence of paleo­seismicity in the epicentral area of the January-February 1703 Central Italy earthquakes. Bulletin of the American Association of Engineering Geologists, Special Volume n. 6: "Perspectives in Paleoseismology", Texas A&M University, Chapter 7, 83-100. Blumetti A.M., Guerrieri L. (2007) - Fault-generated mountain fronts and the identification of fault segments: implications for seismic hazard assessment. Boll. Soc. Geol. It. (Ital.J.Geosci.), 126 (2), 307-322. Blumetti, A.M., Comerci, V., Di Manna, P., Guerrieri L., Vittori E. (2009) - Geological effects induced by the L'Aquila earthquake (6 April 2009; ML=5.8) on the natural environment. Preliminary Report. 38 pp. Chiarabba, C. et al. (2009) - The 2009 L'Aquila (central Italy) Mw 6.3 earthquake: Main shock and aftershocks. Geophys. Res. Lett., 36, L18308, Michetti A.M., Audemard F., Marco S. (2005) - Future trends in paleoseismology: Integrated study of the seismic landscape as a vital tool in seismic hazard analyses, In: Michetti A.M., Audemard F., Marco S. (Editors), "Paleoseismology, integrated study of the Quaternary geological record for earthquake deformation and faulting", Special Issue, Tectonophysics, 408 (1-4), 3-21. Serva L. Blumetti A.M., Guerrieri L. & Michetti A. M. (2002) - The Apennine intermountain basins: the result of repeated strong earthquakes over a geological time interval. Boll. Soc. Geol. It. Special Volume 1, 939-946. Uria de Llanos A. (1703) - Relazione overo itinerario fatto dall'auditore Alfonso Uria del Llanos per riconoscere li danni causati dalli passati terremoi seguiti li 14 Gennaro e 2 Febraro M.DCCIII: Stamperi Gaetano Zenobj, Roma. Vittori E., G. Deiana, E. Esposito, L. Ferreli