Polychlorinated naphthalenes in polar environments — A review

Polychlorinated naphthalenes (PCNs) consist of naphthalene substituted with 1-8 chlorines, yielding 75 possible congeners. They were formerly used in industry, occur at trace levels in commercial PCB mixtures, and have current sources in combustion processes. PCNs are widespread in arctic air with higher levels in the European Arctic. Concentrations were higher during the cold months in arctic Canada and Russia, but no seasonality was noted in subarctic Canada and Greenland. “Marker” congeners indicative of combustion were evident at some sites. Total toxic equivalents (TEQ) in air due to PCNs + dioxin-like PCBs were dominated by PCNs in arctic Canada and Russia, but not in subarctic Canada. Deposition of PCNs in snow was measured in northern Norway and Svalbard. Surveys of PCNs in the lower food web are limited to the northern Baltic Sea and lakes/rivers of northern Scandinavia. PCNs showed little or no biomagnification in lower food webs of the northern Baltic and discrimination among congeners suggested preferential metabolism. There are no reports of PCNs in fish and invertebrates from the Arctic Ocean, and only one from Antarctica. Total PCNs in marine mammals followed the order: harbour seal ~ pilot whale ≥ polar bear > beluga > ringed seal ~ Weddell seal. Total PCNs in seabirds varied over 100-fold, with higher concentrations in glaucous gull eggs and plasma from Bear Island, and livers of northern fulmar from the eastern Canadian Arctic. Lower concentrations occurred in eggs of glaucous gull from Svalbard and black-backed gull from the Faroe Islands. PCNs accounted for < 1% of total TEQ in ringed seal, Weddell seal, seabirds and polar bear, but up to 6-15% in beluga and pilot whale. TEQ due to PCNs were generally low in harbour seal, but up to 9% of total TEQ in some animals.     

Indoor air quality in schools of a highly polluted south Mediterranean area

This study aimed at surveying lower secondary schools in southern Italy, in a highly polluted area. A community close to an industrial area and three villages in rural areas was investigated. Indoor temperature, relative humidity (RH), gaseous pollutants (CO₂ and NO₂), selected biological pollutants in indoor dust, and the indoor/outdoor mass concentration and elemental composition of PM_2.5 were ascertained. Temperature and RH were within, or close to, the comfort range, while CO₂ frequently exceeded the threshold of 1000 ppm, indicating inadequate air exchange rate. In all the classrooms, median NO₂ levels were above the WHO threshold value. Dermatophagoides p. allergen concentration was below the sensitizing threshold, while high endotoxin levels were detected in the classrooms, suggesting schools may produce significant risks of endotoxin exposure. Concentration and solubility of PM_2.5 elements were used to identify the sources of indoor particles. Indoor concentration of most elements was higher than outdoors. Resuspension was responsible for the indoor increase in soil components. For elements from industrial emission (Cd, Co, Ni, Pb, Sb, Tl, V), the indoor concentration depended on penetration from the outside. For these elements, differences in rural vs industrial concentrations were found, suggesting industrial sources may influence indoor air quality nearby schools.     

形、力与结构一段简史

在整个20世纪,无论从概念还是方法论的层面来看,结构工程师和兼任建筑师的结构工程师们针对形、力、体量彼此关系的工作方法都有了重大改变。这个改变得益于设计、工程学和建造技术的协同努力。作者雷莫·佩德雷斯基教授讨论了罗伯特．马亚尔、皮埃尔-奈尔维、爱德华多．托罗哈、菲利克斯．坎德拉、海因茨．伊斯勒和埃拉迪蒂．迪埃斯特的作品,展现了这些重要的改变和贡献,以及它们如何影响我们今天从工程学角度来理解性能的方式。     

Interdisciplinary research and transdisciplinary processes for environmental management under different socio-natural conditions

Interdisciplinary research and transdisciplinary processes as part of environmental management respond to the increasing complexity of socio-natural changes in recent decades. Two similar studies of eutrophication in raw water reservoirs for drinking water production in Norway and China are used to discuss interdisciplinary research and transdisciplinary processes organised through the DPSIR framework (drivers, pressures, states, impacts, and responses) as instruments for environmental management. The conclusion is that interdisciplinary research and transdisciplinary processes can enhance the understanding of complex socio-natural processes under distinctly different institutional systems. The DPSIR framework was not necessary for achieving the desired result.     

Level of viral antigen in blood leucocytes from cattle acutely infected with bovine viral diarrhoea virus

Blood samples from 24 calves undergoing experimental acute infection with a non-cytopathogenic bovine viral diarrhoea virus (BVDV) were examined for viral antigen in peripheral leucocytes with an enzyme-linked immunosorbent assay (ELISA), and for presence of virus in blood plasma in a cell culture assay. With the antigen ELISA, low positive values were detected in leucocytes sampled on days 3-4 from two of eight animals inoculated intranasally, and on days 11-13 from three of 16 animals inoculated intramuscularly. From 22 of the animals, low titres of BVDV were detected in blood plasma obtained 2-9 days after inoculation. All other samples, drawn between 2 and 21 days after inoculation, were negative for viral antigen. All animals seroconverted 3-4 weeks after inoculation, some after having shown mild and transient signs of disease.     

Lexical effects in naming pseudowords in shallow orthographies: Further empirical data.

Pseudoword reading in Italian, a language with a regular but context-sensitive mapping from orthography to phonology, was investigated. Pairs of pseudowords were derived from words by changing the vowel following a target letter. In 1 of the pseudowords, pronunciation of the target grapheme was the same as in the original word (consistent), whereas in the other it was different (inconsistent). In Experiment 1, pseudowords were mixed with words. In the other 2 experiments, only pseudowords were presented. Consistency effects in naming the pseudowords emerged in Experiment 1 but disappeared in Experiments 2 and 3. The pattern of results constrains the functional architecture of reading models because the list composition effect is compatible with a dual-route model but is difficult to reconcile with a single-route framework. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A multi-start local search heuristic for ship scheduling—a computational study

We present a multi-start local search heuristic for a typical ship scheduling problem. A large number of initial solutions are generated by an insertion heuristic with random elements. The best initial solutions are improved by a local search heuristic that is split into a quick and an extended version. The quick local search is used to improve a given number of the best initial solutions. The extended local search heuristic is then used to further improve some of the best solutions found. The multi-start local search heuristic is compared with an optimization-based solution approach with respect to computation time and solution quality. The computational study shows that the multi-start local search method consistently returns optimal or near-optimal solutions to real-life instances of the ship scheduling problem within a reasonable amount of computation time.     

Methods based on discrete optimization for finding road network rehabilitation strategies

We study a dynamic optimization problem arising in the (long-term) planning of road rehabilitation activities. In this area one seeks a pavement resurfacing plan for a road network under budget constraints. Our main approach is to model this as an integer programming problem with underlying dynamic programming structure. We investigate properties of this model and propose a solution method based on Lagrangian relaxation where one gets subproblems that are shortest path problems. Some computational experiences based on realistic data are reported.     

The relationship between activating affects, inhibitory affects, and self-compassion in patients with Cluster C personality disorders.

In the short-term dynamic psychotherapy model termed “Affect Phobia Treatment,” it is assumed that increase in patients' defense recognition, decrease in inhibitory affects (e.g., anxiety, shame, guilt), and increase in the experience of activating affects (e.g., sadness, anger, closeness) are related to enhanced self-compassion across therapeutic approaches. The present study aimed to test this assumption on the basis of data from a randomized controlled trial, which compared a 40-session short-term dynamic psychotherapy (N = 25) with 40-session cognitive treatment (N = 25) for outpatients with Cluster C personality disorders. Patients' defense recognition, inhibitory affects, activating affects, and self-compassion were rated with the Achievement of Therapeutic Objectives Scale (McCullough et al., 2003b) in Sessions 6 and 36. Results showed that increase in self-compassion from early to late in therapy significantly predicted pre- to post-decrease in psychiatric symptoms, interpersonal problems, and personality pathology. Decrease in levels of inhibitory affects and increase in levels of activating affects during therapy were significantly associated with higher self-compassion toward the end of treatment. Increased levels of defense recognition did not predict higher self-compassion when changes in inhibitory and activating affects were statistically controlled for. There were no significant interaction effects with type of treatment. These findings support self-compassion as an important goal of psychotherapy and indicate that increase in the experience of activating affects and decrease in inhibitory affects seem to be worthwhile therapeutic targets when working to enhance self-compassion in patients with Cluster C personality disorders. (PsycINFO Database Record (c) 2011 APA, all rights reserved)