Jet modification via π 0 -hadron correlations in Au+Au collisions at √sNN = 200 GeV

High-momentum two-particle correlations are a useful tool for studying jet-quenching effects in the quark-gluon plasma. Angular correlations between neutral-pion triggers and charged hadrons with transverse momenta in the range 4–12 GeV/c and 0.5–7 GeV/c, respectively, have been measured by the PHENIX experiment in 2014 for Au+Au collisions at √sNN = 200 GeV. Suppression is observed in the yield of high-momentum jet fragments opposite the trigger particle, which indicates jet suppression stemming from in-medium partonic energy loss, while enhancement is observed for low-momentum particles. The ratio and differences between the yield in Au+Au collisions and p+p collisions, IAA and ∆AA, as a function of the trigger-hadron azimuthal separation, ∆ϕ, are measured for the first time at the Relativistic Heavy Ion Collider. These results better quantify how the yield of low-pT associated hadrons is enhanced at wide angle, which is crucial for studying energy loss as well as medium-response effects

Systematic study of nuclear effects in p+Al, p+Au, d+Au, and 3He+Au collisions at √sNN = 200 GeV using π 0 production

The PHENIX collaboration presents a systematic study of inclusive π 0 production from p+p, p+Al, p+Au, d+Au, and 3He+Au collisions at √sNN = 200 GeV. Measurements were performed with different centrality selections as well as the total inelastic, 0%–100%, selection for all collision systems. For 0%–100% collisions, the nuclear-modification factors, RxA, are consistent with unity for pT above 8 GeV/c, but exhibit an enhancement in peripheral collisions and a suppression in central collisions. The enhancement and suppression characteristics are similar for all systems for the same centrality class. It is shown that for high-pT -π 0 production, the nucleons in the d and 3He interact mostly independently with the Au nucleus and that the counter intuitive centrality dependence is likely due to a physical correlation between multiplicity and the presence of a hard scattering process. These observations disfavor models where parton energy loss has a significant contribution to nuclear modifications in small systems. Nuclear modifications at lower pT resemble the Cronin effect – an increase followed by a peak in central or inelastic collisions and a plateau in peripheral collisions. The peak height has a characteristic ordering by system size as p+Au > d+Au > 3He+Au > p+Al. For collisions with Au ions, current calculations based on initial state cold nuclear matter effects result in the opposite order, suggesting the presence of other contributions to nuclear modifications, in particular at lower pT

Effect of edging and docking methods on volume and grade recoveries in the simulated production of flitches

This paper describes edging procedures that have been adapted for use in the pruned log sawing simulation system, AUTOSAW, developed at the Forest Research Institute, New Zealand. Automated sawing simulations were performed on a sample of 20 pruned logs using a standardised sawpattern. These simulations produced a total of 483 flitches of which 221 flitches required edging/docking operations to be applied. Methods were developed to maximise volume and grade recoveries. Each method was examined 3 times, varying the maximum number of edged pieces (from each flitch) from 1 to 3 (simulating 2 to 4 saws). An increase in total volume of approximately 28% was obtained when the maximum number of edged pieces was increased from 1 to 2, and a further 4% increase in volume when increased from 2 to 3.Effets des méthodes de délignage et de rognage sur les rendements en volume et en classe de qualité dans la production de plots obtenus par simulation. L'article décrit les procédures de délignage qui ont été adaptées pour leur emploi dans AUTOSAW, un système de simulation de sciage de grumes élaguées développé à l'Institut de recherches forestières de Nouvelle-Zélande. Des simulations automatisées de sciage ont été réalisées sur un échantillon de 20 grumes élaguées en utilisant un plan de débit standard. Ces simulations ont produit un total de 483 plots dont 221 pour lesquels des opérations de délignage et de rognage ont été requises. Les méthodes ont été développées afin de maximiser les rendements en volume et en classe de qualité. Chaque méthode a été examinée 3 fois en faisant varier de 1 à 3 le nombre maximum de pièces délignées dans chaque plot (simulation de 2 à 4 scies de reprise). Une augmentation d'environ 28% a été obtenue pour le volume total quand le nombre maximum de pièces délignées passait de 1 à 2 ; quand ce nombre maximum passait de 2 à 3, une augmentation supplémentaire de 4% a été obtenue

Effect of edging and docking methods on volume and grade recoveries in the simulated production of flitches

International audienc

Observations of parasitoid behaviour in both no‐choice and choice tests are consistent with proposed ecological host range

The solitary larval endoparasitoid Eadya daenerys Ridenbaugh (Hymenoptera: Braconidae) is a proposed biological control agent of Paropsis charybdis Stål (Coleoptera: Chrysomelidae, Chrysomelinae), a pest of eucalypts in New Zealand. Eadya daenerys oviposition behaviour was examined in two assay types during host range testing, with the aim of improving ecological host range prediction. No‐choice sequential and two‐choice behavioural observations were undertaken against nine closely related species of New Zealand non‐target beetle larvae, including a native beetle, introduced weed biocontrol agents, and invasive paropsine beetles. No behavioural measure was significantly different between no‐choice and two‐choice tests. In sequential no‐choice assays the order of first presentation (target–non‐target) had no significant effect on the median number of attacks or the attack rate while on the plant. Beetle species was the most important factor. Parasitoids expressed significantly lower on‐plant attack rates against non‐targets compared to target P. charybdis larvae. The median number of attacks was always higher towards target larvae than towards non‐target larvae, except for the phylogenetically closest related non‐target Trachymela sloanei (Blackburn) (Coleoptera: Chrysomelidae, Chrysomelinae). Most non‐target larvae were disregarded upon contact, which suggests that the infrequent attack behaviour observed by two individual E. daenerys against Allocharis nr. tarsalis larvae in two‐choice tests and the frass of Chrysolina abchasica (Weise) was probably abnormal host selection behaviour. Results indicate that E. daenerys is unlikely to attack non‐target species apart from Eucalyptus‐feeding invasive paropsines (Chrysomelinae). Non‐lethal negative impacts upon less preferred non‐target larvae are possible if E. daenerys does attack them in the field; however, this is likely to be rare

Tactical and Operational Harvest Planning

The chapter focuses on the forest management decisions undertaken by the private industrial forestland owners concerning medium- and short-term forest planning. Firstly, the scope of forest tactical and operational planning is bounded by comparison with strategic planning as presented in this chapter and with the flow and transportation problems as they are presented in Chap. 9. Then, the chapter describes singular tactical and operational harvest planning decision problems, with emphasis on its specific business decisions as well as the modelling and solution approaches often found in the literature. The problems covered include: scheduling of harvesting operations, machine system/team assignment, harvest sequencing, harvest service adjudication, extraction of the logs, bucking & sorting strategies. The chapter further addresses integrated planning problems, distinguishing between problems with anticipation decisions, used to accommodate the impact on/from other planning problems, and fully integrated problems with more than one type of business decisions.