Исследования по применению флокулянтов для интенсификации работы сгустительного и обезвоживающего оборудования

Наведено результати лабораторних досліджень та промислових випробувань використання різних флокулянтів для інтенсифікації роботи згущувального та зневоднювального обладнання на ГЗФ "Самсонівська" ПАТ "Краснодонвугілля" і ВАТ "ЦЗФ "Добропільська". Виявлено фактори, які необхідно враховувати при виборі синтетичних флокулянтів та режимів флокуляції для інтенсифікації процесів згущення та зневоднення шламів.Приведены результаты лабораторных исследований и промышленных испытаний использования различных флокулянтов для интенсификации работы сгустительного и обезвоживающего оборудования на ГОФ "Самсоновская" ПАО "Краснодонуголь" и ОАО "ЦОФ "Добропольская". Выявлены факторы, которые необходимо учитывать при выборе синтетических флокулянтов и режимов флокуляции для интенсификации процессов сгущения и обезвоживания шламов.The results of laboratory and industrial tests of various flocculant using for the intensification of the thickening and dewatering equipment for МDF "Samsonovskaya" PJSC "Krasnodoncoal" and JSC "CDF" Dobropilska" are shown. The factors which are necessary for consideration at choosing a synthetic flocculants and flocculation regimes to intensify the process of thickening and dewatering of sludge are revealed

Phyllobacterium catacumbae sp. nov., a member of the order 'Rhizobiales' isolated from Roman catacombs

Two strains were isolated from tuff, a volcanic rock that forms the walls of the Roman Catacombs of Saint Callixtus in Rome, Italy. A polyphasic approach using nutritional and physiological tests, reactions to antibiotics, fatty acid profiles, DNA base ratios, DNA-DNA reassociation and 16S rRNA gene sequence comparisons showed that the two isolates belong to a novel species within the genus Phyllobacterium. The species Phyllobacterium catacumbae sp. nov. is proposed. The type strain is CSC19T (=CECT 5680T=LMG 22520T).V. J. and L. L. received fellowships from the Spanish Ministry of Education and Science (MEC), I3P programme and J. M. G. is supported by an MEC contract from the ‘Ramón y Cajal’ program. This study was supported by EC project EVK4-CT2000-00028 and MEC project BTE2002-04492-C02-01.Peer Reviewe

Variations in Concentrations and Compositions of Polycyclic Aromatic Hydrocarbons (PAHs) in Coals Related to the Coal Rank and Origin

The release of unburnt coal particles and associated polycyclic aromatic hydrocarbons (PAHs) may cause adverse impacts on the environment. This study assessed variations in the concentration and composition of PAHs in a set of fifty coal samples from eleven coal basins worldwide. The maximum PAH concentrations at high volatile bituminous rank were recorded in samples from a single basin. Considering the entire sample, the highest PAH concentrations were in fact found outside of this rank range, suggesting that the maceral composition and thus the coal\u27s origin also influenced PAH concentrations. The examination of the PAH compositions revealed that alkylated 2-3 ring PAHs remain dominant compounds irrespective of coal rank or origin. Multivariate analysis based on PAH and maceral content, bulk and maturity parameters allowed the recognition of seven groups with different rank and origin within the coal sample set

Approval Voting on Dichotomous Preferences

The aim of this paper is to find normative foundations of Approval Voting. In order to show that Approval Voting is the only social choice function that satisfies anonymity, neutrality, strategy-proofness and strict monotonicity we rely on an intermediate result which relates strategy-proofness of a social choice function to the properties of Independence of Irrelevant Alternatives and monotonicity of the corresponding social welfare function. Afterwards we characterize Approval Voting by means of strict symmetry, neutrality and strict monotonicity and relate this result to May's Theorem. Finally, we show that it is possible to substitute the property of strict monotonicity by the one efficiency of in the second characterization.This research was undertaken with support from the fellowship 2001FI-00451 of the Generalitat de Catalunya and from the research grant BEC2002-02130 of the Ministerio de Ciencia y Tecnología of Spain

An agent model for business relationships

Relationships are fundamental to all but the most impersonal forms of interaction in business. An agent aims to secure projected needs by attempting to build a set of (business) relationships with other agents. A relationship is built by exchanging private information, and is characterised by its intimacy — degree of closeness — and balance — degree of fairness. Each argumentative interaction between two agents then has two goals: to satisfy some immediate need, and to do so in a way that develops the relationship in a desired direction. An agent’s desire to develop each relationship in a particular way then places constraints on the argumentative utterances. This paper describes argumentative interaction constrained by a desire to develop such relationships.Peer Reviewe

Overview of Polycyclic Aromatic Compounds (PAC)

<div><p>The chemical group of polycyclic aromatic compounds (PAC), including the better-known subgroup of polycyclic aromatic hydrocarbons (PAH) and the heterocyclic aromatic compounds (NSO-PAC, heterocycles), comprise several thousand individual compounds. It is hard to find a comprehensive overview in the literature of these PACs that includes a substantial amount of relevant properties. Here an attempt is made to summarize the most studied but also some less well-known PACs. In addition to basic data such as recommended names, abbreviations, CAS numbers, molecular formulas, chemical structures, and exact mono-isotopic molecular weights, physico-chemical properties taken from the literature like boiling points, vapor pressures, water solubilities, Henry's Law constants, <i>n</i>-octanol-water partition coefficients (log K_OW), and pK_a are summarized. Selected toxicological data are listed indicating carcinogenic and mutagenic activity or effects on different organisms.</p><p>PAC nomenclature is a complex topic, so suggestions for practical use are made. Regarding available data, estimated (instead of measured) values should be used with caution because considerable deviations from experimentally determined values can occur. For an enhanced understanding of the behavior of single PACs in comparison with each other, some of the properties mentioned above are plotted vs. the number of rings or the degree of alkylation. Also, some physico-chemical data are correlated with different functional groups as substituents of the PAHs.</p><p>This article reveals that rather little is known about the less common PACs, e.g., higher molecular weight compounds, alkylated or otherwise substituted aromatics, for instance, keto-, oxo-, amino-, nitro-, cyano-PAHs, or some heterocyclic aromatic compounds, including their derivatives. It mirrors the limited state of knowledge about the variety of PACs that do not belong to the 16 EPA PAHs.</p></div