Bibliographies thématiques / JFCV

Littérature scientifique sur le sujet « JFCV »

Auteur : Grafiati
Publié le 25 juillet 2024

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Articles de revues sur le sujet "JFCV"

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Guilbert-Lepoutre, Aurélie, Anastasios Gkotsinas, Sean N. Raymond et David Nesvorny. « The Gateway from Centaurs to Jupiter-family Comets : Thermal and Dynamical Evolution ». Astrophysical Journal 942, no 2 (1 janvier 2023) : 92. http://dx.doi.org/10.3847/1538-4357/acaa3a.

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Abstract It was recently proposed that there exists a “gateway” in the orbital parameter space through which Centaurs transition to Jupiter-family comets (JFCs). Further studies have implied that the majority of objects that eventually evolve into JFCs should leave the Centaur population through this gateway. This may be naively interpreted as gateway Centaurs being pristine progenitors of JFCs. This is the point we want to address in this work. We show that the opposite is true: gateway Centaurs are, on average, more thermally processed than the rest of the population of Centaurs crossing Jupiter’s orbit. Using a dynamically validated JFC population, we find that only ∼20% of Centaurs pass through the gateway prior to becoming JFCs, in accordance with previous studies. We show that more than half of JFC dynamical clones entering the gateway for the first time have already been JFCs—they simply avoided the gateway on their first pass into the inner solar system. By coupling a thermal evolution model to the orbital evolution of JFC dynamical clones, we find a higher than 50% chance that the layer currently contributing to the observed activity of gateway objects has been physically and chemically altered, due to previously sustained thermal processing. We further illustrate this effect by examining dynamical clones that match the present-day orbits of 29P/Schwassmann-Wachmann 1, P/2019 LD2 (ATLAS), and P/2008 CL94 (Lemmon).
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Wood, Jeremy, et Tobias C. Hinse. « The Transformation of Centaurs into Jupiter-family Comets ». Astrophysical Journal 929, no 2 (1 avril 2022) : 157. http://dx.doi.org/10.3847/1538-4357/ac5964.

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Abstract Centaurs are an ephemeral class of objects that can evolve into Jupiter-family comets (or JFCs) due to gravitational perturbations from the giant planets. In this work, we use numerical integration of massless test particles in the six-body problem (the Sun, four giant planets, and a test particle) to study the transformation of Centaurs into JFCs. We find that Centaurs can transform into JFCs via a rapid, continuous drop in perihelion or aphelion distance to a value below 5.2 au or 7 au, respectively, typically within 5 yr from the start of the drop. We call these JFC perihelion drops and JFC aphelion drops, respectively. These drops are correlated with close approaches to Jupiter. For such perihelion and aphelion drops, the maximum possible fractional change in the associated perihelion or aphelion distance increases with decreasing close-approach distance to Jupiter. A perihelion barrier may exist at 6.3 au. If so, then it must be crossed from above in order for a Centaur to transform into a JFC due to a single close approach to Jupiter. Currently, 93 (or 11%) of the known Centaurs have a perihelion distance, q, below 6.3 au. If the inclination of the orbit of the Centaur to the ecliptic plane is above 10.°2, then orbits with q > 6.3 au and 2 < T J < 3 can exist, where T J is the Tisserand parameter with respect to Jupiter. Small bodies in such orbits could be classified as either Centaurs or JFCs.
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Di Sisto, Romina P., Julio A. Fernández et Adrián Brunini. « Numerical simulations of Jupiter Family Comets ; physical and dynamical effects ». Proceedings of the International Astronomical Union 5, S263 (août 2009) : 102–5. http://dx.doi.org/10.1017/s1743921310001584.

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AbstractWe present results from numerical simulations of a Jupiter family comet (JFC) population (orbital periods P < 20 yr and Tisserand parameters in the range 2 < T < 3.1) originated in the Scattered Disk and transferred to the Jupiter's zone through gravitational interactions with the Jovian planets. We shall call ‘non-JFCs’ those comets coming from the same source, but that do not fulfill the previous criteria (mainly because they have periods P > 20 yr). We have carried out series of numerical simulations of fictitious comets with a purely dynamical model and also with a more complete dynamical - physical model that includes besides nongravitational forces, sublimation and splitting mechanisms. We obtained better fits with models including physical effects, and in particular our best fits are for four splitting models with a relative weak dependence on q, and a mass loss in every splitting event that is smaller/greater for higher/lower frequencies respectively. The mean lifetime of JFCs with radii R > 1 km and q < 1.5 AU is found to be of about 150-200 revolutions (~103 yr). We find a total population of JFCs with radii R > 1 km within Jupiter's zone of 450 ± 50 and a mean lifetime of about 150-200 revolutions (~103 yr) for those getting q < 1.5 AU. The population of JFCs + non-JFCs with radii R > 1 km in Jupiter-crossing orbits may be about ~2,250 ± 250. Most of non-JFCs have perihelia close to Jupiter's orbit.We also present maps of the densest zones of JFCs in the orbital element space.
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Fushimi, Jun, Katsunori Fukutake, Aki Mitsuda, Kazumasa Nakamura, Akihito Wada et Hiroshi Takahashi. « A Rare Case of Completely Calcified Lumber Juxta-facet Cyst : A Case Report ». Journal of Orthopaedic Case Reports 12, no 4 (2022) : 88–91. http://dx.doi.org/10.13107/jocr.2022.v12.i04.2780.

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Introduction: Juxta-facet cysts (JFCs) are extradural lesions. Calcification of cyst walls is often reported, although completely calcified facet cysts are extremely rare. Case Presentation: A 65-year-old man presented with a 1-year history of the right lower extremity weakness and pain, and chronic low back pain. Imaging showed hypointensity on T1- and T2-weighted magnetic resonance images which can be very well appreciated on a completely calcified computed tomography mass arising from the right L3/4 facet joint. The patient underwent a total cyst removal with a facetectomy of the right L3/4 facet, and L3 to L4 posterior fusion. Conclusion: We presented a case of a completely calcified JFC in a patient with back pain and radiculopathy who underwent cystectomy and spinal fusion. JFCs should be considered in the differential diagnosis of calcified extradural lesions.
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Gillan, A. Fraser, Alan Fitzsimmons, Larry Denneau, Robert J. Siverd, Ken W. Smith, John L. Tonry et David R. Young. « Dust Production Rates in Jupiter-family Comets : A Two Year Study with ATLAS Photometry ». Planetary Science Journal 5, no 1 (1 janvier 2024) : 25. http://dx.doi.org/10.3847/psj/ad1394.

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Abstract Jupiter-family comets (JFCs) exhibit a wide range of activity levels and mass loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2020–2021. We measured the dust production rates of the JFCs using the Af ρ parameter and its variation as a function of heliocentric distance. There is a tendency for our JFC sample to exhibit a maximum Af ρ after perihelion, with 254P/McNaught and P/2020 WJ5 (Lemmon) having their maximum Af ρ over a year after perihelion. On average, the rate of change of activity postperihelion was shallower than preperihelion. We also estimated the maximum mass-loss rate for 17 of the JFCs in our sample, finding 4P/Faye to be the most active. We present a subset of comets whose measured Af ρ have been interpolated and extrapolated to a common distance of 2 au preperihelion and postperihelion. From these measurements we found no correlation of intrinsic activity with current perihelion distance. For three of the JFCs in our sample, 6P/d’Arrest, 156P/Russell–LINEAR, and 254P/McNaught, there was no visible coma but a constant absolute magnitude, which we attribute to a probable detection of the nucleus. We derived upper limits for the nuclear radii of ≤2.1 ± 0.3 km, ≤2.0 ± 0.2 km, and ≤4.0 ± 0.8 km, respectively. Finally, we found that 4P/Faye, 108P/Ciffreo, 132P/Helin–Roman–Alu 2, 141P/Machholz 2, and 398P/Boattini experienced outbursts between 2020 and 2022.
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Pokorný, Petr, Althea V. Moorhead, Marc J. Kuchner, Jamey R. Szalay et David M. Malaspina. « How Long-lived Grains Dominate the Shape of the Zodiacal Cloud ». Planetary Science Journal 5, no 3 (1 mars 2024) : 82. http://dx.doi.org/10.3847/psj/ad2de8.

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Abstract Grain–grain collisions shape the three-dimensional size and velocity distribution of the inner Zodiacal Cloud and the impact rates of dust on inner planets, yet they remain the least understood sink of zodiacal dust grains. For the first time, we combine the collisional grooming method combined with a dynamical meteoroid model of Jupiter-family comets (JFCs) that covers 4 orders of magnitude in particle diameter to investigate the consequences of grain–grain collisions in the inner Zodiacal Cloud. We compare this model to a suite of observational constraints from meteor radars, the Infrared Astronomical Satellite, mass fluxes at Earth, and inner solar probes, and use it to derive the population and collisional strength parameters for the JFC dust cloud. We derive a critical specific energy of Q D * = 5 × 10 5 ± 4 × 10 5 R met − 0.24 J kg−1 for particles from JFC particles, making them 2–3 orders of magnitude more resistant to collisions than previously assumed. We find that the differential power-law size index −4.2 ± 0.1 for particles generated by JFCs provides a good match to observed data. Our model provides a good match to the mass-production rates derived from the Parker Solar Probe observations and their scaling with the heliocentric distance. The higher resistance to collisions of dust particles might have strong implications to models of collisions in solar and exosolar dust clouds. The migration via Poynting–Robertson drag might be more important for denser clouds, the mass-production rates of astrophysical debris disks might be overestimated, and the mass of the source populations might be underestimated. Our models and code are freely available online.
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Shober, P. M., T. Jansen-Sturgeon, P. A. Bland, H. A. R. Devillepoix, E. K. Sansom, M. C. Towner, M. Cupák, R. M. Howie et B. A. D. Hartig. « Using atmospheric impact data to model meteoroid close encounters ». Monthly Notices of the Royal Astronomical Society 498, no 4 (27 août 2020) : 5240–50. http://dx.doi.org/10.1093/mnras/staa2559.

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ABSTRACT Based on telescopic observations of Jupiter-family comets (JFCs), there is predicted to be a paucity of objects at sub-kilometre sizes. However, several bright fireballs and some meteorites have been tenuously linked to the JFC population, showing metre-scale objects do exist in this region. In 2017, the Desert Fireball Network (DFN) observed a grazing fireball that redirected a meteoroid from an Apollo-type orbit to a JFC-like orbit. Using orbital data collected by the DFN, in this study, we have generated an artificial data set of close terrestrial encounters that come within 1.5 lunar distances (LD) of the Earth in the size-range of 0.01–100 kg. This range of objects is typically too small for telescopic surveys to detect, so using atmospheric impact flux data from fireball observations is currently one of the only ways to characterize these close encounters. Based on this model, we predict that within the considered size-range 2.5 × 108 objects ($0.1{{\ \rm per\ cent}}$ of the total flux) from asteroidal orbits (TJ &gt; 3) are annually sent on to JFC-like orbits (2 &lt; TJ &lt; 3), with a steady-state population of about 8 × 1013 objects. Close encounters with the Earth provide another way to transfer material to the JFC region. Additionally, using our model, we found that approximately 1.96 × 107 objects are sent on to Aten-type orbits and ∼104 objects are ejected from the Solar system annually via a close encounter with the Earth.
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Ipatov, Sergei I., et John C. Mather. « Migration of comets to the terrestrial planets ». Proceedings of the International Astronomical Union 2, S236 (août 2006) : 55–64. http://dx.doi.org/10.1017/s1743921307003067.

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AbstractWe studied the orbital evolution of objects with initial orbits close to those of Jupiter-family comets (JFCs), Halley-type comets (HTCs), and long-period comets, and the probabilities of their collisions with the planets. In our runs the probability of a collision of one object with the Earth could be greater than the sum of probabilities for thousands of other objects. Even without the contribution of such a few objects, the probability of a collision of a former JFC with the Earth during the dynamical lifetime of the comet was greater than 4×10−6. This probability is enough for delivery of all the water to Earth's oceans during the formation of the giant planets. The ratios of probabilities of collisions of JFCs and HTCs with Venus and Mars to the mass of the planet usually were not smaller than that with Earth. Among 30,000 considered objects with initial orbits close to those of JFCs, a few objects got Earth-crossing orbits with semimajor axesa<2 AU and aphelion distancesQ<4.2 AU, or even got inner-Earth (Q<0.983 AU), Aten, or typical asteroidal orbits, and moved in such orbits for more than 1 Myr (up to tens or even hundreds of Myr). From a dynamical point of view, the fraction of extinct comets among near-Earth objects can exceed several tens of percent, but, probably, many extinct comets disintegrated into mini-comets and dust during a smaller part of their dynamical lifetimes.
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Kareta, Theodore, John W. Noonan, Kathryn Volk, Ryder H. Strauss et David Trilling. « Jupiter Co-Orbital Comet P/2023 V6 (PANSTARRS) : Orbital History and Modern Activity State ». Astrophysical Journal Letters 967, no 1 (1 mai 2024) : L5. http://dx.doi.org/10.3847/2041-8213/ad3dea.

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Abstract The discovery of the transient Jupiter co-orbital comet P/2019 LD2 (ATLAS) drew significant interest. Not only will LD2 transition between being a Centaur and a Jupiter-family comet (JFC) in 2063, the first time this process can be observed as it happens, it is also very active for its large heliocentric distance. We present observations and orbital integrations of the newly discovered transient Jupiter co-orbital comet P/2023 V6 (PANSTARRS), the second such object known. Despite similar modern orbits, V6 is significantly (15×) less active than LD2 and most JFCs as determined via Af ρ measurements at the same R H . We find that V6 is co-orbital between 2020 and 2044, twice the duration of LD2, but it will not become a JFC soon. We interpret these differences in activity as evolutionary, with V6 having lost a significant fraction of its near-surface ice compared to LD2 by previously being warmer. While V6's pre-encounter orbit was somewhat warmer than LD2's, future thermal modeling will be needed to understand if this can explain their differences or if a more significant difference further into the past is required. This is more evidence that LD2 is a pristine and ice-rich object, and thus it may display very strong activity when it becomes a JFC. We use the differences between V6 and LD2 to discuss the interpretation of cometary activity at large heliocentric distances as well as the small end of the cratering record of the Galilean satellites. Continuing observations of both objects are highly encouraged.
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DeSpain, Jarod A., Colin Orion Chandler, William J. Oldroyd, Henry H. Hsieh, Chadwick A. Trujillo, William A. Burris, Jay K. Kueny et al. « Citizen Science Discovery of a Recurrently Active Jupiter-Family Comet : (551023) 2012 UQ192 ». Research Notes of the AAS 7, no 12 (5 décembre 2023) : 257. http://dx.doi.org/10.3847/2515-5172/ad0ed6.

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Abstract We have discovered evidence of cometary activity originating from (551023) 2012 UQ192 (alternately designated 2019 SN40), which we dynamically classify as a Jupiter Family Comet (JFC). JFCs have eccentric Jupiter-crossing orbits and originate in the Kuiper Belt. Analysis of these objects can provide vital information about minor planets in the outer solar system, such as the distribution of volatiles within the solar system. Activity on 2012 UQ192 was first recognized by volunteers on our NASA Partner Citizen Science project Active Asteroids. Through our own examination of archival image data, we found a total of ∼30 images presenting strong evidence of activity near perihelion during two separate orbits. 2012 UQ192 is notable as we found it to be recurrently active. When 2012 UQ192 approaches its perihelion passage in 2027 September, we predict it will reactivate and will be a prime subject for follow-up observations.
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Thèses sur le sujet "JFCV"

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Jaskowiak, Derek C., et David C. Germakian. « Model of the US CENTCOM joint targeting architecture : develop targets ». Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1585.

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Approved for public release, distribution is unlimited
This thesis was conducted in support of a larger research effort to improve US CENTCOM's joint targeting architecture. The ultimate goal of this research project is to develop a working Extend model, which accurately describes CENTCOM's targeting process, in order to assist the Joint Intelligence Interoperability Board (JIIB) in their JIIB Systems Baseline Assessment (JSBA) for fiscal year 2004, as well as for all subsequent JSBAs. This thesis explains the advantages of using a systems engineering approach to developing a process model, and ultimately an Extend model. It provides a brief description of the entire CENTCOM targeting cycle; however, it focuses on the "Develop Targets" activity. The two major products of this research effort are an accurate and detailed paper model using Microsoft Visio, and a baseline Extend model of the "Develop Targets" activity. The Extend model and its capabilities are described in full detail, and it will serve as the foundation from which the other activities in this targeting process will be modeled. Additionally, recommendations for future improvement of the model are explained.
Ensign, United States Naval Reserve
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Livres sur le sujet "JFCV"

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Krentzman, Jackie. JFCS : Centuries of pioneering. Sous la direction de Cooper, Victoria, (Editor-in-chief of JFCS) et Jewish Family and Children's Services of San Francisco, the Peninsula, Marin, and Sonoma Counties. San Francisco, Calif : Jewish Family and Children's Services of San Francisco, the Peninsula, Marin, and Sonoma Counties, 2011.

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Pantham, Satyaraj. Pure JFC swing. Indianapolis, Ind : SAMS, 1999.

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1967-, Asbury Stephen, dir. Programming with JFC. New York : Wiley, 1998.

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Joshi, Daniel I. JFC : Java foundation classes. Foster City, CA : IDG Books Worldwide, Inc., 1998.

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David, Wall. Graphics programming with JFC. New York : Wiley, 1999.

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Kim, Topley, dir. Core JFC : Java foundation classes. 2e éd. Upper Saddle River, NJ : Prentice Hall PTR, 2002.

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Geary, David M. Graphic Java 1.2 : Mastering the JFC. 3e éd. Palo Alto, Calif : Sun Microsystems, 1999.

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Gubitosi, Camillo. Il nuovo quartier generale NATO JFC. Napoli : CLEAN, 2012.

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Pantham, Satyaraj. Pure JFC 2D graphics and imaging. Indianapolis, Ind : Sams, 2000.

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Geary, David M. Graphic Java 1.2 : Mastering the JFC. 3e éd. Mountain View, Calif : Sun Microsystems Press, 1999.

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Chapitres de livres sur le sujet "JFCV"

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Schulz, Kay. « JFC/Swing ». Dans Java professionell programmieren, 3–157. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59619-3_1.

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De Franciscis, Dimitri. « JFCM : A Java Library for FuzzyCognitive Maps ». Dans Fuzzy Cognitive Maps for Applied Sciences and Engineering, 199–220. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39739-4_12.

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Parsons, David. « Building GUIs with the JFC Swing Library ». Dans Foundational Java, 387–416. London : Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2479-5_17.

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Parsons, David. « Building GUIs with the JFC Swing Library ». Dans Texts in Computer Science, 437–69. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54518-5_17.

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Weighill, Rob, et Florence Gaub. « JFC Naples Takes Over ». Dans The Cauldron, 115–58. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190916220.003.0004.

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As the political process ceded prominence to military operations, this chapter illustrates how NATO transitioned from peace to war, dealing with a myriad of operational challenges as it took command of all national forces in a very short space of time. In particular it describes the difficulty of targeting in poor weather, the lack of surveillance capabilities, the absence of accurate and timely intelligence, and how Gaddafi’s forces adapted to the threat posed by NATO’s air and maritime forces. It offers insights into the complexities of conducting maritime embargo operations with competing priorities to grapple with dual use cargo, delivery of humanitarian aid (sometimes accompanied by weapons, explosives and associated materiel) and the preservation of life (SOLAS), principally refugees escaping Libya in small boats. Public expectation indicated a rapid end to combat operations and not long after the operation started, talk of a stalemate emerged. A number of peace initiatives were pursued, all ending in failure and merely confirming Gaddafi’s intention to retain power and avoid any notion of a ceasefire or capitulation.
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Weighill, Rob, et Florence Gaub. « From Benghazi to Bagnoli ». Dans The Cauldron, 31–70. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190916220.003.0002.

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This Chapter presents an account of the rapidly evolving and highly volatile political and strategic environment as the situation in Libya deteriorated. JFC Naples, the NATO headquarters that was to assume responsibility for the operation, was profoundly unprepared for the ensuing campaign and faced many challenges as it planned and transitioned for war. In the face of increasing regime violence and international support, the chapter examines the establishment of an interim government (The National Transitional Council) to counter Gaddafi. It further covers the formal activation of a coalition intervention operation under US command. International political activity intensified sharply as nations and alliances sought a resolution to the ensuing conflict, but with an increasing likelihood of a NATO-led intervention operation to protect civilians. The international community also considered means by which the flow of refugees could be stemmed to reverse the humanitarian crisis.
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Catz, Sergio D. « Characterization of Rab27a and JFC1 as Constituents of the Secretory Machinery of Prostate‐Specific Antigen in Prostate Carcinoma Cells ». Dans Methods in Enzymology, 25–40. Elsevier, 2008. http://dx.doi.org/10.1016/s0076-6879(07)38003-8.

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Actes de conférences sur le sujet "JFCV"

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Sharma, Avani, et Rajbir Kaur. « Non-cryptographic Detection Approach and Countermeasure for JFDV Attack ». Dans the 7th International Conference. New York, New York, USA : ACM Press, 2014. http://dx.doi.org/10.1145/2659651.2659657.

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Sharma, Avani, Rajbir Kaur et Purnendu Karmakar. « JFDV Attack : Influence on Workability of Mobile Ad-Hoc Networks ». Dans 2014 Sixth International Conference on Computational Intelligence, Communication Systems and Networks (CICSyN). IEEE, 2014. http://dx.doi.org/10.1109/cicsyn.2014.44.

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Kudriavtsev, Vladimir, Satoyuki Kawano, T. Isoyama, H. Arai, T. Yambe, Y. Abe, K. Imachi, S. Nitta et H. Hashimoto. « Numerical Study on Fluid-Structure Interaction in VFP Artificial Heart With Jelly-Fish Valve ». Dans ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45114.

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We analyze sinusoidal pulsating flow that develops in the vibrating flow pump (VFP) artificial heart casing. In such system flow is induced by the axial movements of the vibrating pipe. Pipe is capped with the flexible thin disk that is called jelly-fish valve (JFV). Valve is opened during the downward pipe motion and is closed during the upward motion. Valve movement is very similar with the movement of falcon wings. It is due to the pipe motion and happens under the influence of fluid inertial, JFV spring, fluid shear and pressure forces. Authors utilized industrial strength CFD-ACE+/FEMSTRESS software package from CFDRC to analyze dynamic fluid-structure interaction, flow velocity field and time-dependent vorticity distribution. It was shown in the previous studies that blood hemolysis is closely correlated with the maximum values of vorticity fianction ω. In the paper we analyzed valve deformation, related flowfield and vorticity at different transient flow conditions. We can clearly conclude that dynamic formulation allows us to estimate and pinpoint with much greater accuracy the local maxima in vorticity. Vorticity peaks in two areas. First zone is at valve/pipe throat and second zone is at the casing throat. Vorticity is highest at the casing wall, thus pointing the direction for design improvements. Reduction in JFV stiffness helps to open valve wider and to reduce flow vorticity in its vicinity. These are work-in-progress results and additional studies will follow.
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Soto-Hidalgo, J. M., J. Chamorro-Martinez, P. Martinez-Jimenez et D. Sanchez. « JFCS tool : A Java software tool to design fuzzy color spaces ». Dans 2014 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE). IEEE, 2014. http://dx.doi.org/10.1109/fuzz-ieee.2014.6891711.

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Culwin, Fintan. « An introduction to the java foundation classes (JFC) ». Dans CHI '99 extended abstracts. New York, New York, USA : ACM Press, 1999. http://dx.doi.org/10.1145/632716.632795.

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Soto-Hidalgo, J. M., J. Chamorro-Martinez, P. Martinez-Jimenez et D. Sanchez. « Calculating fuzzy histograms on fuzzy color spaces in JFCS tool Java software ». Dans 2015 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE). IEEE, 2015. http://dx.doi.org/10.1109/fuzz-ieee.2015.7337921.

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Bowers, Michael T., Hyun-Sook Kim et Chau-Hong Kuo. « Photodissociation dynamics of small cluster ions ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.jfc6.

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In the last several years we have developed methods for studying the photodissociation dynamics of small cluster ions.1 The method consists of crossing a fast (8-keV) mass-selected cluster ion beam with a polarized laser beam and performing mass and energy analysis on the products. Changing the laser polarization also allows product angular distributions to be obtained (asymmetry parameter analysis). The method allows determination of photodissociation cross sections, branching ratios, product kinetic energy distribution, internal energy distributions (in favorable cases), symmetry of the photoabsorption transition, nature of the excited state photoaccessed (bound or repulsive), and information on the dissociation mechanism. Approximately twenty systems have been studied so far. We concentrate on (SO2)2. Results have been obtained between 600 and 350 nm (2.07 and 3.54 eV). Over most of this range photodissociation dominates over photodetachment. Details of the photodissociation mechanism and observations about the excited states accessed are given.
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8

Wallace, Stephen C. « Multilaser threshold photoionization spectroscopy of jet-cooled moles and Van der Waals clusters ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.jfc2.

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The dynamic properties of the excited states of polyatomic molecules show a considerable sensitivity to intermolecular interactions, both in terms of lifetimes and photoionization thresholds. Using multilaser, threshold photoionization spectroscopy in conjunction with picosecond time-resolved fluorescence emission studies, it has been possible to characterize the fundamental photophysical properties of a range of model biological molecules in a supersonic beam. A number of novel features, such as conformational effects on photoionization thresholds, solvent-induced interstate decoupling, femtosecond radiationless transition rates, and cluster ion stabilization energetics are presented.
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9

Reents, W. D., M. L. Mandich et Vladimir E. Bondybey. « Chemistry of size-selected silicon clusters as studied by Fourier transform mass spectrometry ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.jfc4.

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Direct laser vaporization of materials provides a simple method to form small ionic silicon clusters. These clusters may be kept in the ion trap of a Fourier transform mass spectrometer (FTMS) for up to several seconds. The capabilities of the FTMS are then used to determine bimolecular rate constants, identify reaction products, and evaluate product distributions of the ionic silicon clusters.
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10

Watts, R. O., et K. G. H. Baldwin. « High-resolution IR spectroscopy of ethylene dimers ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.jfc8.

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A differentially pumped free-jet expansion, together with a waveguide CO2 laser, has been used to measure the infrared predissociation spectrum of ethylene clusters near 950 cm-1. The CO2 laser has a pressure broadened tuning range of 240 MHz. We observe sharp transitions in association with many of the laser lines which activate the monomer C2H2 molecules in their v7 mode. By varying the concentration of C2H4 in a carrier gas, by changing the carrier gas, and by using both bolometric and mass spectrometric detection systems, we are able to confirm the findings of Snels et al.1 that there is fine structure in the ethylene dimer predissociation spectrum near 950 cm-1. The linewidths of all the observed features lie in the 15-20-MHz range, giving a lower limit on the pre-dissociation lifetime of ~ 10ns.
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Rapports d'organisations sur le sujet "JFCV"

1

Doherty, Patrick J. One Hat Too Many : The JFC and Component Command. Fort Belvoir, VA : Defense Technical Information Center, janvier 2001. http://dx.doi.org/10.21236/ada395560.

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2

Lowe, George M. Go/ No-Go Criteria for the JFC in Counterinsurgency Operations. Fort Belvoir, VA : Defense Technical Information Center, mai 2009. http://dx.doi.org/10.21236/ada502956.

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