Relevant bibliographies by topics / N dynamics

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'N dynamics'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 June 2025

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Journal articles on the topic "N dynamics"

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Mikishanina, E. A. "Dynamics of a Controlled Articulated $n$-trailer Wheeled Vehicle." Nelineinaya Dinamika 17, no. 1 (2021): 39–48. http://dx.doi.org/10.20537/nd210104.

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This article is devoted to the study of the dynamics of movement of an articulated $n$-trailer wheeled vehicle with a controlled leading car. Each link of the vehicle can rotate relative to its point of fixation. It is shown that, in the case of a controlled leading car, only nonholonomic constraint equations are sufficient to describe the dynamics of the system, which in turn form a closed system of differential equations. For a detailed analysis of the dynamics of the system, the cases of movement of a wheeled vehicle consisting of three symmetric links are considered, and the leading link (leading car) moves both uniformly along a circle and with a modulo variable velocity along a certain curved trajectory. The angular velocity remains constant in both cases. In the first case, the system is integrable and analytical solutions are obtained. In the second case, when the linear velocity is a periodic function, the solutions of the problem are also periodic. In numerical experiments with a large number of trailers, similar dynamics are observed.
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Li, Tanping, Yaowen Cui, John Mathaga, Revati Kumar, and Daniel G. Kuroda. "Hydration and vibrational dynamics of betaine (N,N,N-trimethylglycine)." Journal of Chemical Physics 142, no. 21 (June 7, 2015): 212438. http://dx.doi.org/10.1063/1.4919795.

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Ling, Fengzi, Yanmei Wang, Ling Cao, Jie Wei, Dejun Liu, Zhigao Luo, Jinyou Long, Pengfei Wang, Xinli Song, and Song Zhang. "Structural dynamics upon photoinduced charge transfer in N,N,N′,N′-tetramethylmethylenediamine." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 293 (May 2023): 122524. http://dx.doi.org/10.1016/j.saa.2023.122524.

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Klotz, Alexander R. "Bubble dynamics in N dimensions." Physics of Fluids 25, no. 8 (August 2013): 082109. http://dx.doi.org/10.1063/1.4817803.

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Chapman, Curtis F., Richard S. Fee, and Mark Maroncelli. "Solvation dynamics in N-methylamides." Journal of Physical Chemistry 94, no. 12 (June 1990): 4929–35. http://dx.doi.org/10.1021/j100375a032.

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Gukov, S., I. R. Klebanov, and A. M. Polyakov. "Dynamics of (n,1) strings." Physics Letters B 423, no. 1-2 (March 1998): 64–70. http://dx.doi.org/10.1016/s0370-2693(98)00090-2.

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Winkler, B., I. Kaiser, M. Chall, G. Coddens, B. Hennion, and R. Kahn. "Dynamics of N(CH3)4GeCl3." Physica B: Condensed Matter 234-236 (June 1997): 70–71. http://dx.doi.org/10.1016/s0921-4526(96)00883-6.

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Miller, Tomasz, Michał Eckstein, Paweł Horodecki, and Ryszard Horodecki. "Generally covariant N-particle dynamics." Journal of Geometry and Physics 160 (February 2021): 103990. http://dx.doi.org/10.1016/j.geomphys.2020.103990.

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Spiegel, Heide, Michael Pfeffer, and Johannes Hösch. "N Dynamics under Reduced Tillage." Archives of Agronomy and Soil Science 48, no. 5 (January 2002): 503–12. http://dx.doi.org/10.1080/03650340215644.

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Elpidoforou, Nikolaos, Ioannis Skarmoutsos, Emmanouil Kainourgiakis, Vasilios Raptis, and Jannis Samios. "Local structure and translational dynamics of NMF (N-methylformamide)–DMF (N,N-dimethylformamide) mixtures, via molecular dynamics simulation." Journal of Molecular Liquids 226 (January 2017): 16–27. http://dx.doi.org/10.1016/j.molliq.2016.09.039.

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Dissertations / Theses on the topic "N dynamics"

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Little, D. A. "Electron-N₂⁺ scattering and dynamics." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1464074/.

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Molecular nitrogen, N₂, is the most abundant molecule in the terrestrial atmosphere. Its cation N₂⁺ is therefore prevalent in the earth's ionosphere as well as in nitrogen plasmas produced for reasons varying from lightning strikes to combustion. Any model which seeks to describe plasmas in air must contain a description of nitrogen ion chemistry. Despite this, there is a distinct paucity of data describing electron-N₂⁺ interactions and the resultant bound and quasi-bound electronic structure of N₂. The characterisation of these states is essential for describing dissociative recombination which is the main destroyer of molecular ions in a plasma. This thesis aims to alleviate this problem by performing extensive ab initio R-matrix calculations to create a comprehensive map of the highly-excited electronic structure of N₂ which can the be used to perform a dissociative recombination cross-section calculation. Potential energy curves were found by performing resonant and bound state calculations for all singlet and triplet molecular symmetries of N₂ up to l ≤ 4. The use of a dense grid meant that highly-excited electronic states could be found with an unprecedented level of detail. Many of the states were previously unknown. A new fitting method was developed for the characterisation of resonant states using the time-delay method. It was shown that whilst the R-matrix method is not competitive with conventional quantum chemistry techniques for low lying valence states, it is particularly appropriate for highly-excited states, such as Rydberg states. The data gained from these calculations was then used as an input for a multichannel quantum defect theory calculation of a dissociative recombination cross-section. A description is given of how to prepare the data from the R-matrix calculation for input into a multichannel quantum defect theory dissociative recombination cross-section calculation. Cross-sections were found for v=0-3 including three ionic cores. Whilst previous studies of dissociative recombination using R-matrix data required some empirical intervention, the cross-section found in this thesis is completely ab initio and is in good agreement with experiment.
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Alvares, Raul. "Holographic descriptions of large N gauge dynamics." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/347732/.

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We use the AdS/CFT correspondence to study different aspects of large N dynamics of gauge theories in the strongly coupled regime. We present three models designed to capture some of the physics present in QCD at low energies or QCD-type theories such as walking tecnhicolor. We use the D3/D7 system to study chiral symmetry breaking in two different contexts: In the first model we break chiral symmetry with an arbitrary running coupling which has a pion in its spectrum. We derive integral equations for the quark condensate and pion decay constant by matching our model to a low energy chiral lagrangian and discuss the implications for technicolor theories. In the second model we study the on set of chiral symmetry breaking at the edge of the conformal window in QCD in the Veneziano limit and show a BKT-type transition. Finally, in the context of AdS/QCD we extend the ”hard wall” model to include the tensor operator ¯φσ^(μν)ψ dual to a two form satisfying a self duality condition and study numerically the spectrum of vector mesons.
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Hodgson, Matthew David. "Spin dynamics of n-doped gallium arsenide." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/6662/.

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The emerging technology of spintronics promises to revolutionise computing by allowing considerably more energy efficient computing than is currently possible. Gallium Arsenide is one candidate material for use in semiconductor spintronic devices and as such detailed study of the spintronic properties of Gallium Arsenide is required. In this thesis we develop a semiclassical approach to the simulation of the electron population in Gallium Arsenide. We then use this model to look at the properties of the electron system, in particular the time taken for the electron population to undergo spin depolarisation. Comparison of the results to experimental values for the spin depolarisation suggest that the currently well accepted approach is accurate for low to moderate n type doping densities, but for higher densities there is a significant departure from the experimentally obtained results. We explore a number of improvements to the usual model showing substantial improvement in the range of densities that can be accurately predicted. As Dilute Magnetic Semiconductors have been the topic of substantial research, we also apply the model to investigate the properties of an magnetic impurity in n doped Gallium Arsenide. We compare the results to the Langevin enhanced Landau Lifshitz Gilbert equation, which shows good agreement allowing us to predict an appropriate damping constant as a result of the magnetic interaction with the electron population. We also investigate the nature of the noise felt by the magnetic atom showing that the usual white noise approximation is of limited validity.
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Wooten, E. Wrenn. "Structure, conformation and dynamics of N-linked oligosaccharides." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253421.

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Allison, Susan. "Intermolecular structure and dynamics of aqueous N-methylacetamide." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/2427.

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The twin questions of how and why protein molecules fold into the specific topologies which enable them to fulfill their biological function have been the subject of continuous scientific investigation since the early twentieth century. Interactions between biological macromolecules and water are obviously crucial to both folding and function but attempts to gain understanding are impeded by the size and complexity of these systems. A useful approach is to consider much simpler model systems which capture some essential element of real biological systems but are experimentally and theoretically tractable. N-methylacetamide (NMA) is a minimal model of the peptide linkage which forms the backbone of protein molecules. Its behaviour in aqueous solution therefore captures the important competition between peptide - peptide and peptide - water hydrogen bonds which arises in protein hydration. In this thesis aqueous NMA solutions are studied across the full concentration range using classical molecular dynamics simulation. This gives access to the complete spectrum of behaviour between the two important limiting cases of dilute NMA in water and, conversely, dilute water in NMA. Water is now known to be an active player in biological interactions and the simple system studied here displays significant disruption of the structure and dynamics of pure water with the addition of only a small proportion of peptide groups. At dilute NMA concentrations water molecules continue to form system-size hydrogen bonded networks. Water molecules appear to optimise their local tetrahedral order by forming hydrogen bonds with a combination of NMA and water neighbours, rather than solely with members of their own species. NMA molecules hydrogen bond through the amide and carbonyl groups to form linear and branched chains in both the pure liquid and in the aqueous solutions. In the NMA rich region water molecules preferentially donate both hydrogens to chain-end or midchain carbonyl oxygens, forming bridges between NMA chains which resemble buried water configurations found in protein cavities. These bridge structures are thought to contribute to the observed slowing of the system dynamics at these concentrations. The investigation of dynamics by classical simulation is complemented by a quasielastic neutron scattering study of NMA in its liquid and aqueous phases.
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Purchase, Steve. "N-body algorithms and applications to galactic dynamics." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/12811.

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Typically galaxies contain 10<sup>11</sup> stars and globular clusters contain 10<sup>6</sup> stars. In order to investigate the dynamical evolution of these systems one may perform numerical simulations (<i>N</i>-body simulations); which in turn are restricted to 10<sup>3</sup> to 10<sup>7</sup> particles depending on the required accuracy and adopted evolutionary model. For the <i>N</i>-body direct method the computational effort scales at least as O(<i>N</i><sup>3</sup>), and thus the need for efficient and accurate evolutionary models and advances in hardware in apparent. A review of the <i>N</i>-body evolutionary models is presented and, with the advent of parallel super computers, the parallelisation of these evolutionary models is investigated. In particular, we discuss the parallelisation of a direct method <i>N</i>-body code; focusing upon a new parallelisation strategy, implementing the evolutionary model with a portable parallel language (High Performance Fortran), and reducing the communication costs between processors by a suitable implementation of the Hypersystolic algorithm. A dynamical system, such as a galaxy, may oscillate about a stable equilibrium if it is excited above that state. These modes of oscillation may persist long enough to have observable consequences, despite being weakly damped. The moods of oscillation are investigated with a range of evolutionary models. The simplest mode to detect and simulate is the "fundamental" mode or "<i>l = </i>0" mode, which manifests itself as a radical oscillation of the entire system. To investigate this mode a King W<sub>0</sub> = 1 theoretical model is adopted. The effect of adopting a softened gravitational potential to generate the forces between stars on the fundamental mode is investigated with a direct method <i>N</i>-body evolutionary model, and these results are compared to those which use an SCF (self-consistent field) type code. The presence of small and amplitude fundamental mode oscillations is detectable when the perturbation particle method is used, which would otherwise be undetectable for another <i>N</i>-body evolutionary model, due to particle noise. Furthermore, the source of heavy damping in direct method <i>N</i>-body simulations is found to be phase mixing. The experimental fundamental mode oscillations are found to match well with the theoretically predicted frequencies. A more complicated mode, the "sloshing" mode or "<i>l = </i>1" is also studied. This mode manifests itself in the density centre shifting or sloshing about. To investigate this mode a King <i>W</i><sub>0</sub> = 5 model is adopted, and the results compared to an analytical predicted frequency.
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Fabrizzi, Karina Paola. "Microbial ecology and C and N dynamics in Agroecosystems." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/241.

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Figueiredo, Nuno Miguel Ramos. "Dinâmica do azoto em campos alagados para produção de arroz em Salvaterra de Magos." Master's thesis, ISA/UTL, 2011. http://hdl.handle.net/10400.5/4479.

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Musanur, Abrar Siraj. "Development of an empirical force field and molecular dynamics simulation of N,N'-dialkylimidazolium ionic liquids." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53737.

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Thesis (MSc)--Stellenbosch University, 2004<br>ENGLISH ABSTRACT: In an ongoing study an empirical force field that can correctly model N,N'- dialkylimidazolium halide ionic liquids, the Imidazolium Ionic Liquid Force Field - IILFF, was developed based on experimental data obtained from the Cambridge Structural Database (CSD) and data calculated using Gaussian98. Different conformations of the isolated cations were optimised at the Hartree-Fock level using the 6-31G(d) basis set. Structural, vibrational and partial atomic charge data of the lowest energy conformation of each cation were taken as observables during optimisation of the force field parameters. Initial parameters of the IILFF were taken from existing force fields and were optimised using the above mentioned data. The IILFF was used to minimise isolated cations as well as crystals. These results were successfully tested against isolated cations minimised using Gaussian98 and the experimental crystals. Finally, the melting process of the 1,3-dimethylimidazolium chloride crystal was studied using an NPT ensemble starting from an ordered crystal cell and increasing the simulation temperature beyond the experimental melting temperature. The IILFF was then used to calculate the potential energy of the system.<br>AFRIKAANSE OPSOMMING: In 'n voortgaande studie om 'n empiriese kragveld te bou wat N,N' -dialkielimidasoliumhalied ioniese vloeistowwe korrek kan modelleer is die Imidasolium Ioniese Vloeistof Kragveld (nVK) ontwikkel. Die kragveld is ontwikkel gebasseer op eksperimentele data verkry uit die Cambridge Strukturele Databasis (CSD) asook uit data vanaf Gaussian98 berekeninge. Verskillende konformasies van die geïsoleerde katione is geoptimiseer deur middel van Hartree Fock 6-31G(d) berekeninge. Strukturele data, asook vibrasies en gedeeltelike atoom ladings van die laagste energie konformasie van elke katioon is gebruik as waarneembare veranderlikes vir die bepaling van die optimale kragveld parameters. Beginwaardes vir die nVK is geneem uit bestaande kragvelde en geoptimiseer met behulp van bogenoemde data. Die IIVK is gebruik om geïsoleerde katione asook kristalle te minimiseer. Die resultate is suksesvol getoets teen geïsoleerde katione wat met behulp van Gaussian98 geminimiseer is en eksperimenteel bepaalde kristalle. Laastens is die smeltproses van die 1,3-dimetielimidasolium chloried kristal bestudeer met behulp van 'n NPT ensemble. Daar is begin by 'n geordende kristal en die simulasie temperatuur is verhoog tot meer as die eksperimentele smeltpunt. Die IIVK is dan gebruik om die potensiële energie van die sisteem te bepaal.
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Andrews, Maximilian N. [Verfasser]. "Molecular dynamics on monomeric IAPP in solution / Maximilian N. Andrews." Dortmund : Universitätsbibliothek Technische Universität Dortmund, 2011. http://d-nb.info/1012572943/34.

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Books on the topic "N dynamics"

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Tachikawa, Yuji. N=2 Supersymmetric Dynamics for Pedestrians. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-08822-8.

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Contopoulos, G., N. K. Spyrou, and L. Vlahos, eds. Galactic Dynamics and N-Body Simulations. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-57983-4.

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Peters, Cornelis Johan. Phase behaviour of binary mixtures of ethane + N-eicosane and statistical mechanical treatment of fluid phases. Pijnacker: Dutch Efficiency Bureau, 1986.

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Reinders, Adrie. The N factor: How efficient networking can change the dynamics of your business. El Monte, CA: WBusiness Books, 2007.

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Reinders, Adrie. The N factor: How efficient networking can change the dynamics of your business. El Monte, CA: WBusiness, 2007.

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1924-, Roy A. E., Steves Bonnie A, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Study Institute on From Newton to Chaos: Modern Techniques for Understanding and Coping with Chaos in N-Body Dynamical Systems (1993 : Cortina d'Ampezzo, Italy), eds. From Newton to chaos: Modern techniques for understanding and coping with chaos in n-body dynamical systems. New York: Plenum Press, 1995.

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Devito, Kevin John. The importance of runoff and winter anoxia to P and N dynamics of a beaver pond. [Toronto]: Queen's Printer for Ontario, 1992.

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Branch, Ontario Water Resources. The importance of runoff and winter anoxia to P and N dynamics of a beaver pond. Toronto: Queen's Printer for Ontario, 1992.

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Astrophysics School (6th 1993 Thessalonikē, Greece). Galactic dynamics and n-body simulations: Lectures held at the Astrophysics School VI, organized by the European Astrophysics Doctoral Network (EADN) in Thessaloniki, Greece, 13-23 July 1993. Berlin: Springer-Verlag, 1994.

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Cook, Steven Ralph. Measurement of momentum transfer coefficients for Hb2s, Nb2s, CO, and COb2s incident upon spacecraft surfaces. Houston, Tex: National Aeronautics and Space Administration, Lyndon B. Johnson Space Center, 1997.

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Book chapters on the topic "N dynamics"

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Gregson, Robert A. M. "Sequential Dynamics of Transposition Phenomena." In n-Dimensional Nonlinear Psychophysics, 66–83. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003167181-4.

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Gregson, Robert A. M. "Nonlinear Psychophysical Dynamics in n Dimensions." In n-Dimensional Nonlinear Psychophysics, 14–39. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003167181-2.

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El Hasi, Claudio D. "Nontrivial Dynamics and Inflation." In Chaos in Gravitational N-Body Systems, 239–44. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0307-4_24.

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Beckmann, Aike. "N." In Aquatic Physiosphere-Biosphere Dynamics and Modelling, 299–314. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54157-6_13.

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Gregson, Robert A. M. "Variations in the Dynamics of one Component." In n-Dimensional Nonlinear Psychophysics, 84–118. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003167181-5.

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Aarseth, Sverre J. "Direct N-Body Calculations." In Dynamics of Star Clusters, 251–59. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5335-2_26.

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Dover, Carl B. "Quark dynamics of N $$\bar N$$ annihilation." In Medium Energy Nucleon and Antinucleon Scattering, 80–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-16054-x_161.

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Freitag, Marc. "Fokker–planck Treatment of Collisional Stellar Dynamics." In The Cambridge N-Body Lectures, 97–121. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8431-7_4.

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Ferraz-Mello, S., J. C. Klafke, T. A. Michtchenko, and D. Nesvorný. "Chaotic Transitions in Resonant Asteroidal Dynamics." In Chaos in Gravitational N-Body Systems, 93–105. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0307-4_8.

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Morino, Luigi. "Dynamics of n-Particle Systems." In Mathematics and Mechanics - The Interplay, 855–906. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63207-9_21.

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Conference papers on the topic "N dynamics"

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Davletkildeev, N. A., D. V. Sokolov, I. A. Lobov, and S. N. Nesov. "Effect of Ar+ Irradiation of N-Doped MWCNTs on the Morphology, Electrophysical and Capacitive Properties of Electrochemical Electrodes with Polyaniline." In 2024 Dynamics of Systems, Mechanisms and Machines (Dynamics), 1–5. IEEE, 2024. https://doi.org/10.1109/dynamics64718.2024.10838644.

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Siemens, Dmitrij. "Combined analysis of $\pi N \to \pi N$ and $\pi N \to \pi \pi N$ in ChPT." In The 8th International Workshop on Chiral Dynamics. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.253.0086.

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Maystrenko, Vasilii A., Vladimir V. Maystrenko, Evgeny Y. Kopytov, and Alexander Lyubchenko. "Analysis of operation algorithms of N-OFDM modem in channels with AWGN." In 2017 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2017. http://dx.doi.org/10.1109/dynamics.2017.8239486.

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Li, Qu-zhi. "The N/D study on the singularity structure of $\pi N$ scattering amplitudes." In The 10th International Workshop on Chiral Dynamics. Trieste, Italy: Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.413.0067.

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Goldberg, V. Z., та G. V. Rogachev. "α-cluster states in N≠Z nuclei". У NUCLEAR STRUCTURE AND DYNAMICS 2012. AIP, 2012. http://dx.doi.org/10.1063/1.4764217.

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Istomin, V. A., E. V. Kustova, and L. A. Puzyreva. "Transport Properties of Electronically Excited N[sub 2]∕N and O[sub 2]∕O Mixtures." In 27TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS. AIP, 2011. http://dx.doi.org/10.1063/1.3562723.

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Holly, Matthew, and Carl Tropper. "Parallel Discrete Event N-Body Dynamics." In 2011 ACM/IEEE/SCS 25th Workshop on Principles of Advanced and Distributed Simulation (PADS). IEEE, 2011. http://dx.doi.org/10.1109/pads.2011.5936760.

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Lawrence, Scott. "Real-Time Dynamics At Large N." In The 38th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.396.0518.

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Opoku-Agyeman, Bernice, and Anne McCoy. "NON-ADIABATIC DYNAMICS OF ICN–(Ar)n and BrCN–(Ar)n." In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.fd02.

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Gazizov, R. R., A. V. Medvedev, and T. R. Gazizov. "Using Portraits of N-Norms for Large-Scale Investigation of Circuits with Modal Reservation." In 2021 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2021. http://dx.doi.org/10.1109/dynamics52735.2021.9653464.

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Reports on the topic "N dynamics"

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Vilasi, Gaetano. Nambu Dynamics, n-Lie Algebras and Integrability. GIQ, 2012. http://dx.doi.org/10.7546/giq-10-2009-265-278.

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Vilasi, Gaetano. Nambu Dynamics, n-Lie Algebras and Integrability. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-16-2009-77-91.

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Castner, E. W. Temperature-dependence of the ultrafast intermolecular dynamics of Amides: Formamide, N-methylformamide, N,N-dimethylformamide, N- methylacetamide, and N-methylpropionamide from 290-370 K. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/249036.

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Arturo Massol, James Tiedje, Jizhong Zhou, and Allan Devol. Molecular Approaches to Understanding C & N Dynamics in MArine Sediments. Office of Scientific and Technical Information (OSTI), May 2007. http://dx.doi.org/10.2172/903396.

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Mniszewski, Susan, Christian Negre, Jamaludin Mohd-Yusof, Adetokunbo Adedoyin, Jean-Luc Fattebert, and Daniel Osei-Kuffuor. O(N) Quantum Molecular Dynamics (QMD) Algorithms, Code Requirements, Release Notes, and Library Deployment. Office of Scientific and Technical Information (OSTI), March 2022. http://dx.doi.org/10.2172/1856125.

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Castellano, Mike J., Abraham G. Shaviv, Raphael Linker, and Matt Liebman. Improving nitrogen availability indicators by emphasizing correlations between gross nitrogen mineralization and the quality and quantity of labile soil organic matter fractions. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7597926.bard.

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A major goal in Israeli and U.S. agroecosystems is to maximize nitrogen availability to crops while minimizing nitrogen losses to air and water resources. This goal has presented a significant challenge to global agronomists and scientists because crops require large inputs of nitrogen (N) fertilizer to maximize yield, but N fertilizers are easily lost to surrounding ecosystems where they contribute to water pollution and greenhouse gas concentrations. Determination of the optimum N fertilizer input is complex because the amount of N produced from soil organic matter varies with time, space and management. Indicators of soil N availability may help to guide requirements for N fertilizer inputs and are increasingly viewed as indicators of soil health To address these challenges and improve N availability indicators, project 4550 “Improving nitrogen availability indicators by emphasizing correlations between gross nitrogen mineralization and the quality and quantity of labile organic matter fractions” addressed the following objectives: Link the quantity and quality of labile soil organic matter fractions to indicators of soil fertility and environmental quality including: i) laboratory potential net N mineralization ii) in situ gross N mineralization iii) in situ N accumulation on ion exchange resins iv) crop uptake of N from mineralized soil organic matter sources (non-fertilizer N), and v) soil nitrate pool size. Evaluate and compare the potential for hot water extractable organic matter (HWEOM) and particulate organic matter quantity and quality to characterize soil N dynamics in biophysically variable Israeli and U.S. agroecosystems that are managed with different N fertility sources. Ultimately, we sought to determine if nitrogen availability indicators are the same for i) gross vs. potential net N mineralization processes, ii) diverse agroecosystems (Israel vs. US) and, iii) management strategies (organic vs. inorganic N fertility sources). Nitrogen availability indicators significantly differed for gross vs. potential N mineralization processes. These results highlight that different mechanisms control each process. Although most research on N availability indicators focuses on potential net N mineralization, new research highlights that gross N mineralization may better reflect plant N availability. Results from this project identify the use of ion exchange resin (IERs) beads as a potential technical advance to improve N mineralization assays and predictors of N availability. The IERs mimic the rhizosphere by protecting mineralized N from loss and immobilization. As a result, the IERs may save time and money by providing a measurement of N mineralization that is more similar to the costly and time consuming measurement of gross N mineralization. In further search of more accurate and cost-effective predictors of N dynamics, Excitation- Emission Matrix (EEM) spectroscopy analysis of HWEOM solution has the potential to provide reliable indicators for changes in HWEOM over time. These results demonstrated that conventional methods of labile soil organic matter quantity (HWEOM) coupled with new analyses (EEM) may be used to obtain more detailed information about N dynamics. Across Israeli and US soils with organic and inorganic based N fertility sources, multiple linear regression models were developed to predict gross and potential N mineralization. The use of N availability indicators is increasing as they are incorporated into soil health assessments and agroecosystem models that guide N inputs. Results from this project suggest that some soil variables can universally predict these important ecosystem process across diverse soils, climate and agronomic management. BARD Report - Project4550 Page 2 of 249
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Bar-Tal, Asher, Paul R. Bloom, Pinchas Fine, C. Edward Clapp, Aviva Hadas, Rodney T. Venterea, Dan Zohar, Dong Chen, and Jean-Alex Molina. Effects of soil properties and organic residues management on C sequestration and N losses. United States Department of Agriculture, August 2008. http://dx.doi.org/10.32747/2008.7587729.bard.

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Objectives - The overall objective of this proposal was to explore the effects of soil properties and management practices on C sequestration in soils and off-site losses of N.The specific objectives were: 1. to investigate and to quantify the effects of soil properties on C transformations that follow OW decomposition, C losses by gaseous emission, and its sequestration by organic and mineral components of the soil; 2. to investigate and to quantify the effects of soil properties on organic N mineralization and transformations in soil, its losses by leaching and gaseous emission; 3. to investigate and to quantify the effects of management practices and plants root activity and decomposition on C and N transformations; and 4. to upgrade the models NCSOIL and NCSWAP to include inorganic C and root exudation dynamics. The last objective has not been fulfilled due to difficulties in experimentally quantification of the effects of soil inorganic component on root exudation dynamics. Objective 4 was modified to explore the ability of NCSOIL to simulate organic matter decomposition and N transformations in non- and calcareous soils. Background - Rates of decomposition of organic plant residues or organic manures in soil determine the amount of carbon (C), which is mineralized and released as CO₂ versus the amount of C that is retained in soil organic matter (SOM). Decomposition rates also greatly influence the amount of nitrogen (N) which becomes available for plant uptake, is leached from the soil or lost as gaseous emission, versus that which is retained in SOM. Microbial decomposition of residues in soil is strongly influenced by soil management as well as soil chemical and physical properties and also by plant roots via the processes of mineral N uptake, respiration, exudation and decay.
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Wagner, M. R. NMR investigation of dynamic processes in complexes of nickel(II) and zinc(II) with iminodiacetate, n-methyliminodiacetate and n-ethyliminodiacetate. Office of Scientific and Technical Information (OSTI), November 1985. http://dx.doi.org/10.2172/5982240.

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Katehakis, Michael N., and Costis Melolidakis. Dynamic Repair Allocation for a K Out of N System Maintained by Distinguishable Repairmen. Fort Belvoir, VA: Defense Technical Information Center, August 1987. http://dx.doi.org/10.21236/ada185584.

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Flanagan Pritz, Colleen, Colleen Emery, Branden Johnson, James Willacker, Christopher Kotalik, Katherine Ko, Michael Bell, David Walters, and Collin Eagles-Smith. Sampling dragonflies for mercury analysis in Grand Canyon National Park, 2018–2024: A contribution of the Dragonfly Mercury Project. National Park Service, 2025. https://doi.org/10.36967/2310449.

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The Dragonfly Mercury Project is a collaborative initiative that utilizes dragonfly larvae as biosentinels to monitor mercury concentrations across 180 national parks and other protected lands, including Grand Canyon National Park (GRCA). These indicators serve as surrogates for environmental risk and can indicate where fish consumption could pose health risks through exposure to mercury. From 2018 to 2024, citizen scientists and staff from the National Park Service and U.S. Geological Survey helped collect close to 400 larvae from 25 GRCA sites across nearly 300 river miles, revealing mercury concentrations ranged from 3.0 to 1337 ng/g (parts per billion) dry weight. Results were available for 20 tributary sites. Upon comparing mercury concentrations to an impairment index, 90% of the sites (N = 18) were classified as low or no risk for ecological impairment, though 10% (2 sites) exceeded moderate or severe risk benchmarks (Pete’s Pocket and Buck Farm Canyon, respectively). The data from GRCA tributaries suggests that Hg risk is relatively low compared to the nationwide dataset. A catch-per-unit-effort metric was used to assess sampling difficulty at 10 sites, revealing that Nankoweap Creek would take the longest to sample, while the mainstem site at Colorado River RM204 would take the shortest. Sources of mercury to GRCA likely stem from a combination of atmospheric deposition, upstream discharge from Lake Powell, and other watershed contributions. In addition, food web dynamics, underlying water chemistry, and environmental disturbances (e.g., floods) contribute to mercury mobilization, production, and bioaccumulation. Report findings provide a baseline for connecting ongoing science in the Colorado River watershed, informing management actions, and enhancing public engagement through citizen science.
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