5,297 research outputs found

    Design of a network of reusable logistic containers

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    In this paper, we consider the management of the return flows of empty logistic containers that accumulate at the customer’s sites. These containers must be brought back to the factories in order to sustain future expeditions. We consider a network composed of several factories and several customers in which the return flows are independent of the delivery flows. The models and their solutions aim at finding to which factory the contain- ers have to be brought back and at which frequency. These frequencies directly define the volume of logistic containers to hold in the network. We consider fixed transportation costs depending on the locations of the customers and of the factories and linear holding costs for the inventory of logistic containers. The analysis also provides insight on the benefit of pooling the containers among different customers and/or factories.supply chain management, returnable items, reverse logistic, economic order quantity, network design

    The Indigenous as Orthodox: Religious Evolution in Tana Toraja

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    Within the last century, the Toraja regency in South Sulawesi has seen an unprecedented amount of social change. From their beginnings as hierarchical feudalistic culture at the turn of the 20th century to operating one of the largest tourist attractions in Indonesia, their way of life has been turned on its head. Most notably, these changes begin as religious and expand to impact cultural, political and economic life as well. This paper examines those changes from the regions blossoming of the Aluk To Dolo indigenous tradition to the incorporation of Christianity and finally the consolidation and preservation of indigenous beliefs through tourism and homogenization. Major outside catalysts such as the Indonesian government, missionaries, militants, and tourists have forced the Torajan people into a unique position in relation to their own beliefs. This position has indefectibly altered their course of life, but to deny that the Torajan people themselves did not have an active role in their own versions of these alteration is to deny their agency. Moreover, the Torajan people had a purposeful role in altering their ceremonies, religious identity and ways of life to meet these challenges presented from outside forces. Thus, reveling a key aspect of religion in the face of history: change is inevitable and never constant in its practice

    Factorization and the Soft Overlap Contribution to Heavy-to-Light Form Factors

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    Using the formalism of soft-collinear effective theory, a complete separation of short- and long-distance contributions to heavy-to-light transition form factors at large recoil is performed. The universal functions ζM(E)\zeta_M(E) parameterizing the ``soft overlap'' contribution to the form factors are defined in terms of matrix elements in the effective theory. Endpoint configurations corresponding to kinematic situations where one of the valence partons in the external mesons carries very small momentum are accounted for in terms of operators involving soft-collinear messenger fields. They contribute at leading order in ΛQCD/E\Lambda_{\rm QCD}/E and spoil factorization. An analysis of operator mixing and renormalization-group evolution in the effective theory reveals that the intermediate scale EΛ\sqrt{E\Lambda} is without significance to the soft functions ζM(E)\zeta_M(E), and that the soft overlap contribution does not receive a significant perturbative (Sudakov) suppression.Comment: 30 pages, 6 figures. Erratum adde

    Concentrating mixtures of neuroactive pharmaceuticals and altered neurotransmitter levels in the brain of fish exposed to a wastewater effluent

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    Fish can be exposed to a variety of neuroactive pharmaceuticals via the effluent discharges from wastewater treatment plants and concerns have arisen regarding their potential impacts on fish behaviour and ecology. In this study, we investigated the uptake of 14 neuroactive pharmaceuticals from a treated wastewater effluent into blood plasma and brain regions of roach (Rutilus rutilus) after exposure for 15 days. We show that a complex mixture of pharmaceuticals including, 6 selective serotonin reuptake inhibitors, a serotonin-noradrenaline reuptake inhibitor, 3 atypical antipsychotics, 2 tricyclic antidepressants and a benzodiazepine, concentrate in different regions of the brain including the telencephalon, hypothalamus, optic tectum and hindbrain of effluent-exposed fish. Pharmaceuticals, with the exception of nordiazepam, were between 3–40 fold higher in brain compared with blood plasma, showing these neuroactive drugs are readily uptaken, into brain tissues in fish. To assess for the potential for any adverse ecotoxicological effects, the effect ratio was calculated from human therapeutic plasma concentrations (HtPCs) and the measured or predicted fish plasma concentrations of pharmaceuticals. After accounting for a safety factor of 1000, the effect ratios indicated that fluoxetine, norfluoxetine, sertraline, and amitriptyline warrant prioritisation for risk assessment studies. Furthermore, although plasma concentrations of all the pharmaceuticals were between 33 and 5714-fold below HtPCs, alterations in serotonin, glutamate, acetylcholine and tryptophan concentrations were observed in different brain regions of effluent-exposed fish. This study highlights the importance of determining the potential health effects arising from the concentration of complex environmental mixtures in risk assessment studies

    SIMS chemical analysis of extended impact features from the trailing edge portion of experiment AO187-2

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    One hundred capture cells from the trailing edge, which had lost their cover foils during flight, were optically scanned for extended impact features caused by high velocity projectiles impinging on the cells while the foils were still intact. Of the 53 candidates, 24 impacts were analyzed by secondary ion mass spectroscopy for the chemical composition of the deposits. Projectile material was found in all impacts, and at least 75 percent of them appear to be caused by interplanetary dust particles. Elemental ratios are fractionated, with refractory elements enriched in the impacts relative to interplanetary dust particles collected in the stratosphere. Although this could be due to systematic differences in the compositions, a more likely explanation is volatility fractionation during the impact process

    Survey of southern Missouri Plethodontidae in Ozark caves

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    Plethodontidae is a large family of salamanders with a distribution ranging from eastern North Americato northern South America. Three genera and nine species occur in Missouri, most of which are typically found in cavesfor at least part of their lives. These species have been recorded to emerge from hibernation in early April and throughoutMay. This study shares the species abundance and diversity in ten Missouri Ozark caves: seven near St. Louis andthree near Springfield. Each cave was surveyed at least once between November 2021 and September 2022 using visualencounter surveys. Observational data were recorded without handling any individuals to minimize disturbance. Thethree caves near St. Louis had few to no salamanders present in early April, despite optimal weather conditions, buttended to have larger populations throughout the summer. Two caves near Springfield held at least a dozen individualsof multiple species in mid-April. Few individuals were recorded in the most southwestern cave sampled, potentiallydue to pollution or recent flooding. Our findings could aid others studying plethodontid salamanders to determine theprime conditions for emergence from hibernation, optimal habitats for different species in each cave zone, and potentialbiological or chemical impacts that could affect salamander abundance in caves

    Toward an Energy Efficient Language and Compiler for (Partially) Reversible Algorithms

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    We introduce a new programming language for expressing reversibility, Energy-Efficient Language (Eel), geared toward algorithm design and implementation. Eel is the first language to take advantage of a partially reversible computation model, where programs can be composed of both reversible and irreversible operations. In this model, irreversible operations cost energy for every bit of information created or destroyed. To handle programs of varying degrees of reversibility, Eel supports a log stack to automatically trade energy costs for space costs, and introduces many powerful control logic operators including protected conditional, general conditional, protected loops, and general loops. In this paper, we present the design and compiler for the three language levels of Eel along with an interpreter to simulate and annotate incurred energy costs of a program.Comment: 17 pages, 0 additional figures, pre-print to be published in The 8th Conference on Reversible Computing (RC2016
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