Search results for "TRACT"
showing 10 items of 9251 documents
Kilka uwag o skutkach odstąpienia od umowy
2018
Wolność pracy jako przesłanka ograniczająca swobodę kontraktowania - wybrane problemy
2022
Zgodnie z art. 65 ust. 1 Konstytucji RP każdemu zapewnia się wolność wyboru i wykonywania zawodu oraz wyboru miejsca pracy. Wpływ wyrażonej we wskazanym przepisie wolności pracy na swobodę kształtowania umownych stosunków pracy jest wciąż otwartym polem do dyskusji prawniczej. W prezentowanym tekście autorzy zmierzają do rozstrzygnięcia, czy zasada wolności pracy może zostać uznana za przesłankę ograniczającą swobodę kontraktowania. Zagadnienie to, mające charakter dogmatyczny, poddane zostało analizie systemowej. Autorzy przyjmują, że z perspektywy stosunków prywatnoprawnych wolność pracy należy ujmować jako element obiektywnego, preferowanego porządku wartości społeczno-gospodarczych (zas…
Psychological contract profiles among permanent and temporary agency workers
2016
Purpose– Based on the psychological contract (PC) theory, the purpose of this paper is to identify PC profiles, differentiating between permanent and temporary agency workers (TAW). Moreover, the authors analyzed whether different profiles presented different levels of work engagement.Design/methodology/approach– A cross-sectional survey data analysis of 2,867 workers, of whom 1,046 were TAW, was analyzed using latent profile analyses.Findings– Four PC profiles were identified, which differed quantitatively in terms of the overall dimension levels (i.e. balanced, relational and transactional) for PC (i.e. content and fulfillment). ANCOVAs showed that the relational/balanced dominant and tra…
Effet colloide-protecteur d'extraits de parois de levures sur la stabilité tartrique d'une solution hydro-alcoolique modèle
1993
<p style="text-align: justify;">L'effet colloïde-protecteur d'extraits mannoprotéiques de parois de levures vis-à-vis de la précipitation tartrique a été étudié en solution hydroalcoolique, en utilisant un IST mètre (Indice de Stabilité Tartrique).</p><p style="text-align: justify;">Nous avons montré que les deux extraits levuriens inhibaient la cristallisation du bitartrate de potassium au même titre que l'acide métatartrique et la carboxyméthylcellulose, mais à un niveau plus faible. Le niveau de stabilité retenu (ISTC-75) est assuré avec des concentrations par litre de 7,5 mg d'acide métatartrique et de 18 mg de carboxyméthylcellulose. Des concentrations en extraits man…
Áreas protegidas e urbanização : o caso da APA da ilha do Combú, Belém-PA
2020
The paper seeks to answer two questions: what is the influence of the geographical location of the island of Combú in the metropolitan area of Belém, PA, and whether its current status as an Area of Environmental Protection (APA) has any impact on biodiversity and socioeconomic development? Similar to other riverside areas in the Amazon, Combú has a long history of involvement in the trade of extractive products. However, its geographical proximity to Belém and consequent access to markets made producers less dependent on intermediaries, while the ownership of resources was based on independent family units. Therefore, the dominant mode of caboclo extractivism, together with limited access …
Pokolenie młodych bez pracy jako wyzwanie dla integracji międzypokoleniowej w Unii Europejskiej
2013
Contemporary demographic trends has been leading to the phenomenon of society's ageing in advanced economies, especially in European Union. This problem is one of the most burning issue nowadays and makes a great challenge to the future stability and development of the whole society. The idea of intergenerational integration provides a kind of solution. Unfortunately, because of the economic crisis, the intergenerational contract (which set the rules of aforementioned partnership) is no longer fair. There is a progressive divergence among generations, and the youth is the most affected group. This problem generates conflict between the disillusioned youth and other generations which has a n…
Zero hours contracts: hacia la flexibilidad absoluta del trabajo en la era digital
2018
El objetivo del artículo es analizar los zero hours contracts en el Reino Unido. Son contratos donde el empleador no garantiza un mínimo de trabajo y el que ofrece su fuerza de trabajo puede rechazarlo. Se han extendido para todo tipo de profesiones no configuradas originalmente como freelance. Partiendo del tratamiento legal que es muy limitado, se analiza la calificación contractual de los trabajadores en contratos de cero horas, cuyas categorías en el mundo anglosajón no tienen una correspondencia exacta con el trabajo por cuenta ajena o por cuenta propia de nuestro sistema. Como la fórmula más absoluta de trabajo a demanda son ampliamente utilizados por empresas tradicionales y en empre…
Experimental investigation on the efficiency of zinc(II) recovery from waste streams by TBP liquid-liquid extraction
2016
In many industrial processes the presence of zinc in the wastewater may represent an obstacle to its high efficient regeneration. This is the case of the treatment of spent pickling solutions aiming the recovery of hydrochloric acid via pyrohydrolysis techniques. Hydrochloric spent pickling solutions from steel processing contain relevant amount of metals such as iron (Fe) and zinc (Zn) that may significantly affect recovery of hydrochloric acid (HCl) through pyrohydrolysis. In fact, although Fe may be recovered as ferric oxide (Fe2O3) and does not have a substantial effect on pyrohydrolysis process, zinc chloride (ZnCl2) evaporating can occlude nozzles and stick to the pyrohydrolysis react…
Recovering of zinc(II) from spent pickling solutions by liquid-liquid extraction
2015
Hydrochloric acid can be successfully recovered from spent pickling liquors with high efficiencies via pyrohydrolysis techniques. In the pickling solution feed, other metallic ions are typically present besides iron (mainly Fe2+) such as zinc(II). In order to avoid undesirable effects, zinc(II) has to be removed, because zinc chloride evaporates and sticks to the reactor walls, as well as it contaminates iron oxides product1. Moreover, zinc recovery is economically affordable because it allows the marketing of some products such as ZnCl2 and ZnSO4. In the present work, liquid-liquid extraction process has been selected to recover zinc(II) from pickling liquors, using suitable extractant age…
La mesure de l'efficacité scolaire par la méthode de l'enveloppe : test des filières alternatives de recrutement des enseignants dans le cadre du pro…
2009
Data envelopment and school effectiveness: contract teachers' efficiency compared to civil servants in the Education for all process) In the context of EFA process, countries, in general the most depressed LDC, both constrained by scarcity of funding and urgency for expanding school access have set up new tracks for teacher recruitment on annually renewable contracts. Those teachers are often not professionally trained in regards with traditional pedagogical curricula. They receive much lower salaries than regular civil service teachers. This has been a controversial policy, but there is very limited evidence on the effectiveness or failure of contract teachers in improving student learning…