Dynamics of polymer bridge formation and disruption

In this Letter we show, with colloidal probe AFM measurements, that the formation and subsequent disruption of polymer bridges between two solid surfaces is characterized by slow relaxation times. This is due to the retardation of polymer dynamics near a surface. For colloidal particles, that are in constant (Brownian) motion, kinetic aspects are key. To understand these effects, we develop a model of polymer bridging and bridge disruption that agrees quantitatively with our experiment

Effect Of Soil Management On The White Grub Population And Damage In Soybean

To evaluate the effect of soil management systems on population of white grubs, (Phyllophaga cuyabana Moser), and on its damage in soybean, experiments were set up under no-tillage and conventional tillage (one disk plow, and a leveling disk harrow) areas. Primary tillage equipment, used in other soil management systems, such as moldboard plow, disk plow, chisel plow and heavy duty disk harrow were also tested. Fluctuation of P. cuyabana population and the extent of its damage to soybean was similar under no-tillage and conventional tillage systems. Results comparing a range of primary tillage equipment showed that it affected soil insect populations differently, depending on the time during the season in which tillage was executed. Larval mortality could mostly be attributed to their exposure to adverse factors, soon after tillage, than to changes in soil conditions. Reduction of white grub population was more evident in plots managed by heavier equipment, such as the moldboard plow. Soil tillage could be one component within the soil pest management system in soybean, however, its use can not be generalized.355887894Alvarado, L., (1979) Comparación Poblacional de "Gusanos Blancos" (Larvas de Coléopteros Scarabaeidae) en Tres Situaciones de Manejo, 5p. , Pergamino : INTA/ EERA, (INTA/EERA. Genéralidades Carpeta de Producción Vegetal. Información, 16)Brown, W.R., Gange, A.C., Insect herbivore below ground (1990) Advances in Ecological Research, 20, pp. 1-58. , San DiegoGarcia, M.A., Arthropods in tropical corn field: Effects of woods and insecticides on community composition (1991) Plant-animal Interactions: Evolutionary Ecology in Tropical and Temperate Regions, pp. 619-634. , PRICE, P.LEWINSOHON, T.M.FERNANDES, W.BENSON, W.W. (Eds.). New York: J. WileyGassen, D.N., Corós associados ao sistema de plantio direto (1993) Plantio Direto no Brasil, pp. 141-149. , ALDEIA NORTE (Passo Fundo, RS) (Ed.). Passo Fundo : Embrapa-CNPT/Fundacep Fecotrigo/Fundação ABCHammond, R.B., Stinner, B.R., Seedcom maggots (Diptera: Anthomyiidae) and slugs in conservation tillage systems in Ohio (1987) Journal of Economic Entomology, 80, pp. 680-684. , LanhamHoffmann-Campo, C.B., Parra, J.R.P., Mazzarin, R.M., Ciclo biológico de Sternechus subsignatus Boheman, 1836 (Coleoptera: Curculionidae) em soja no norte do Paraná (1991) Revista Brasileira de Biologia, 51, pp. 615-621. , Rio de Janeiro(1976) Manual Agropecuário para O Paraná, 1. , LondrinaOliveira, L.J., (1997) Ecologla Comportamental e de Interações com Plantas Hospedeiras em Phyllophaga Cuyabana (Moser) (Coleoptera: Melolonthidae, Melolonthinae) e Implicações para o Seu Manejo em Cultura de Soja, 148p. , Campinas : Unicamp, Tese de DoutoradoOliveira, L.J., Hoffmann-Campo, C.B., Do Amaral, M.L.B., Nachi, C., (1992) Coró Pequeno da Soja, 4p. , Londrina : Embrapa-CNPSo. (Embrapa-CNPSo. Documentos, 51)Oliveira, L.J., Hoffmann-Campo, C.B., Sistemas de preparo de solo: Efeito sobre populações de larvas de escarabeídeos e Sternechus subsignatus (1996) Resultados de Pesqulsa de Soja 1990/91, pp. 464-468. , EMBRAPA. Centro National de Pesquisa de Soja (Londrina, PR). Londrina, (Embrapa-CNPSo. Documentos, 99)Rincón, M.B.N., Tiscareño, M., Velásquez, M., Diversidad y abundancia de Melolonthidae y Scarabaeidae (Insecta: Coleoptera) asociados a diferentes sistemas de labranza y porcentajes de cobertura vegetal en agrosistemas de maíz del Estado de Michoacan, México (1997) Reunión Latino-americana de Escara-beidologia, 3, pp. 18-19. , Xalapa. Memórias. Xalapa: Institute de Ecologia, 1997Shelton, M.D., Edwards, C.R., Effects of weeds on the diversity and abundance of insects on soybeans (1983) Environmental Entomology, 12, pp. 296-298. , LanhamDa Silva, M.T.B., Grutzmacher, A.D., Ruedell, J., Link, D., Costa, E.C., Influência de sistemas de manejo de suelos y de culturas sobre insectos sub́terraneos (1994) Clência Rural, 24, pp. 247-251. , Santa MariaDa Silva, M.T.B., Klein, V.A., Efeito de diferentes métodos de preparo do solo na infestação e danos de Sternechus subsignatus (Boheman) em soja (1997) Ciência Rural, 27, pp. 533-536. , Santa MariaDa Silva, M.T.B., Klein, V.A., Link, D., Reinert, D.J., Influência de sistemas de manejo de solos na oviposição de Diloboderus abderus Sturm (Coleoptera: Melolonthidae) (1994) Anais da Sociedade Entomológica Brasileira, 3, pp. 543-548. , LondrinaSloderbeck, P.E., Yeargen, K.V., Green cloverworm (Lepidoptera: Noctuidae) populations in conventional and double-cropped, no-till soybeans (1983) Journal of Economic Entomology, 76, pp. 785-791. , LanhamSmith, A.W., Hammond, R.B., Stinner, B.R., Influence of rye-cover crop management on soybean foliage arthropods (1988) Environmental Entomology, 17, pp. 109-114. , LanhamStinner, B.R., House, G.J., Arthropods and other invertebrates in conservation-tillage agriculture (1990) Annual Review of Entomology, 35, pp. 299-318. , Palo AltoStrnad, S.P., Bergman, M.K., Movement of first-instar western corn rootworms (Coleoptera: Chrysomelidae) in soil (1987) Environmental Entomology, 16, pp. 975-978. , LanhamToxclair Jr., N.N., Boethel, D.J., The influence of tillage practices and row spacing on soybean insect populations in Louisiana (1984) Journal of Economic Entomology, 77, pp. 1571-1579. , LanhamWinter, J.P., Voroney, R.P., Ainsworth, D.A., Soil microarthropods in long-term no-tillage and conventional tillage corn production (1990) Canadian Journal of Soil Science, 70, pp. 641-653. , Ottaw

Evaluating the AdS dual of the critical O(N) vector model

We argue that the AdS dual of the three dimensional critical O(N) vector model can be evaluated using the Legendre transform that relates the generating functionals of the free UV and the interacting IR fixed points of the boundary theory. As an example, we use our proposal to evaluate the minimal bulk action of the scalar field that it is dual to the spin-zero ``current'' of the O(N) vector model. We find that the cubic bulk self interaction coupling vanishes. We briefly discuss the implications of our results for higher spin theories and comment on the bulk-boundary duality for subleading N.Comment: 17 pages, 1 figure, v2 references added, JHEP versio

Isobutyl acetate: electronic state spectroscopy by high-resolution vacuum ultraviolet photoabsorption, He(I) photoelectron spectroscopy and ab initio calculations

The high-resolution vacuum ultraviolet photoabsorption spectrum of isobutyl acetate, C6H12O2, is presented here and was measured over the energy range 4.3–10.8 eV (290–115 nm). Valence and Rydberg transitions with their associated vibronic series have been observed in the photoabsorption spectrum and are assigned in accordance with new ab initio calculations of the vertical excitation energies and oscillator strengths. The measured photoabsorption cross sections have been used to calculate the photolysis lifetime of this ester in the Earth’s upper atmosphere (20–50 km). Calculations have also been carried out to determine the ionization energies and fine structure of the lowest ionic state of isobutyl acetate and are compared with a photoelectron spectrum (from 9.5 to 16.7 eV), recorded for the first time. Vibrational structure is observed in the first photoelectron band of this molecule

Hybridisation at work

This paper presents the encoding of the hybridisation method into the HETS platform.FC

Binding of Polarons and Atoms at Threshold

If the polaron coupling constant $\alpha$ is large enough, bipolarons or multi-polarons will form. When passing through the critical $\alpha_c$ from above, does the radius of the system simply get arbitrarily large or does it reach a maximum and then explodes? We prove that it is always the latter. We also prove the analogous statement for the Pekar-Tomasevich (PT) approximation to the energy, in which case there is a solution to the PT equation at $\alpha_c$. Similarly, we show that the same phenomenon occurs for atoms, e.g., helium, at the critical value of the nuclear charge. Our proofs rely only on energy estimates, not on a detailed analysis of the Schr\"odinger equation, and are very general. They use the fact that the Coulomb repulsion decays like $1/r$, while `uncertainty principle' localization energies decay more rapidly, as $1/r^2$.Comment: 19 page

Discrete skew selfadjoint canonical systems and the isotropic Heisenberg magnet model

A discrete analog of a skew selfadjoint canonical (Zakharov-Shabat or AKNS) system with a pseudo-exponential potential is introduced. For the corresponding Weyl function the direct and inverse problem are solved explicitly in terms of three parameter matrices. As an application explicit solutions are obtained for the discrete integrable nonlinear equation corresponding to the isotropic Heisenberg magnet model. State space techniques from mathematical system theory play an important role in the proofs

Intelligent planning for allocating containers in maritime terminals

Maritime container terminals are facilities where cargo containers are transshipped between ships or between ships and land vehicles (tucks or trains). These terminals involve a large number of complex and combinatorial problems. One of them is related to the Container Stacking Problem. A container yard is a type of temporary store where containers await further transport by truck, train or vessel. The main efficiency problem for an individual stack is to ensure easy access to containers at the expected time of transfer. Stacks are 'last-in, first-out' storage structures where containers are stocked in the order they arrive. But they should be retrieved from the stack in the order (usually different) they should be shipped. This retrieval operation should be efficiently performed, since berthing time of vessels and the terminal operations should be optimized. To do this, cranes can relocate containers in the stacks to minimize the rearrangements required to meet the expected order of demand for containers. In this paper, we present a domain-dependent heuristically guided planner for obtaining the optimized reshuffling plan, given a stacking state and a container demand. The planner can also be used for finding the best allocation of containers in a yard-bay in order to minimize the number of reshuffles as well as to be used for simulation tasks and obtaining conclusions about possible yard configurations. © 2011 Elsevier Ltd. All rights reserved.This work has been partially supported by the research projects TIN2010-20976-C02-01 (Min. de Ciencia e Innovacion, Spain), P19/08 (Min. de Fomento, Spain-FEDER) and the VALi+d Program of the Conselleria d'Educacio (Generalitat Valenciana), as well as with the collaboration of the maritime container terminal MSC (Mediterranean Shipping Company S.A.).Rodríguez Molins, M.; Salido Gregorio, MA.; Barber Sanchís, F. (2012). Intelligent planning for allocating containers in maritime terminals. Expert Systems with Applications. 39(1):978-989. https://doi.org/10.1016/j.eswa.2011.07.098S97898939

The intrinsic charm contribution to the proton spin

The charm quark contribution to the first moment of $g_1(x,Q^2)$ is calculated using a heavy mass expansion of the divergence of the singlet axial current. It is shown to be small.Comment: LATEX, 6 page

Feeding And Oviposition Preference Of Phyllophaga Cuyabana (moser) (coleoptera: Melolonthidae) On Several Crops

Laboratory and greenhouse experiments were carried out to study food and oviposition preference by Phyllophaga cuyabana (Moser) on different plant species as Cajanus cajan L. (pigeon pea), Crotalaria juncea L. (sun hemp), Crotalaria spectabilis Roth (showy crotalaria), Crotalaria ochroleuca G. Don (slenderleaf rattlebox), Glycine max [L.] Merrill (soybean), Gossypium hirsutum L. (cotton), Helianthus annuus L. (sunflower), Stizolobium aterrimum [Mucuna aterrima] Piper & Tracey (velvetbean) and Zea mays L. (mayze). In no-choice experiments, the number of eggs layed in sunflower, C. juncea and soybean was larger compared to cotton. Despite the fact that the adults did not discriminate among plants, in dual-choice test, the proportion of eggs layed and leaf consumption by P. cuyabana adults in soybean were significantly higher than in C. spectabilis. The larval distribution in the soil was at random in multiple-choice, withouth any trend of preference, but in dual-choice, when soybean was the control, larvae always preferred to feed on its roots. P. cuyabana adults had preference for more suitable hosts and that could stand their offspring survival. This behaviour can be usefully exploited in an integrated management program for this pest.365759764Craig, T.P., Itami, J.K., Price, P.W., A strong relationship between oviposition preference and larval performance in a shoot-galling sawfly (1989) Ecology, 70, pp. 1691-1699Diagne, A. 2004. Seasonal occurrence of Phyllophaga species and biological studies of Phyllophaga ephilida (Say) on sweet potato, Ipomoea batatas (1) Lam, in Louisiana. PhD thesis, Louisiana State University and Agricultural and Mechanical College, Baton Rouge, 101pMoron, M.A., (1986) El genero Phyllophaga en México: Morfología, distribución y sistematica supraespecifica, , México, Instituto de Ecología, 341pOliveira, L.J., B. Santos, J.R.P. Parra & C.B. Hoffmann-Campo. 2004. Coró-da-soja, p.151-176. In J.R. Salvadori, C.J. Ávila & M.T.B. da Silva (org.), Pragas de solo no Brasil. Passo Fundo, Embrapa Trigo, Embrapa Agropecuária Oeste, Fundacep, 541pOliveira, L.J., Garcia, M.A., Flight, feeding and reproductive behaviour of Phyllophaga cuyabana (Moser) (Coleoptera: Melolonthidae) adults (2003) Pesq. Agropec. Bras, 38, pp. 179-186Potter, D.A., Held, D.W., Biology and management of the Japanese beetle (2002) Annu. Rev. Entomol, 47, pp. 175-205Silva, M.T.B. da & J.R. Salvadori. 2004. Coró-das-pastagens, p.191-210. In J.R. Salvadori, C.J. Ávila & M.T.B. da Silva (org.), Pragas de solo no Brasil. Passo Fundo, Embrapa Trigo, Embrapa Agropecuária Oeste, Fundacep, 541pSilva, da, M.T.B., Tarragó, M.F.S., Link, D., Costa, E.C., Preferência de oviposição de Diloboderus abderus (Sturm) por restos de culturas em solo com plantio direto (1996) An. Soc. Entomol. Brasil, 25, pp. 83-87Rausher, M.D., Alteration of oviposition behaviour by Battus philenor butterflies in response to variation in host-plant density (1983) Ecology, 64, pp. 1028-1034Thompson, H.N., Evolutionary ecology of the relationship between oviposition preference and performance of offspring in phytophagous insects (1988) Entomol. Exp. Appl, 47, pp. 3-14Travis, B.V., Habits of the June beetle, Phyllophaga lanceolata (Say), in Iowa (1939) J. Econ. Entomol, 32, pp. 690-69