Search results for "REE"

Acetic acid leaching of neodymium magnets and iron separation by simple oxidative precipitation

2022

Neodymium-iron-boron (NdFeB) has become the most prominent permanent magnet alloy, with a wide variety of applications and an ever-increasing demand. Their recycling is important for securing the supply of critical raw materials used in their manufacturing. The use of organic acids such as acetic acid has been of recent interest for the recycling of waste NdFeB magnets. Despite achieving good leaching efficiencies, the published literature has not properly investigated the effects of key factors influencing the acetic acid leaching process and their respective interactions, which has lead to conflicting findings as to what conditions are optimal. The present work goes to show that no such o…

TP53 mutations and S-phase fraction but not DNA-ploidy are independent prognostic indicators in laryngeal squamous cell carcinoma

2005

To prospectively evaluate the prognostic significance of TP53, H-, K-, and N-Ras mutations, DNA-ploidy and S-phase fraction (SPF) in patients affected by locally advanced laryngeal squamous cell carcinoma (LSCC). Eight-one patients (median follow-up was 71 months) who underwent resective surgery for primary operable locally advanced LSCC were analyzed. Tumor DNA was screened for mutational analysis by PCR/SSCP and sequencing. DNA-ploidy and SPF were performed by flow cytometric analyses. Thirty-six patients (44%) had, at least, a mutation in the TP53 gene. Of them, 22% (8/36) had double mutations and 3% (1/36) had triple mutations. In total, 46 TP53 mutations were observed. The majority (41…

Application of the PHREEQC Program to Assess the Chemical Stability of Tap Water in Kielce

2020

Badania przeprowadzono na próbkach wody w Kielcach pochodzące z dwóch ujęć: Białogon i Zagnańsk. Przedstawiono wyniki wybranych wskaźników dla tych wód, m.in. najważniejszych wpływających na ich stabilność chemiczną, tj. wapnia lub magnezu. Następnie, za pomocą programu PHREEQC, obliczono wskaźniki stabilności dla wód w Kielcach z dwóch ujęć, o których mowa. W kolejnym etapie sprawdzono poprawność metody badania wody za pomocą programu poprzez bilans jonowy wody i porównanie pH wyznaczonej wody z wartością wyznaczoną w wyniku obliczeń. Dla wyżej wymienionych czynności przygotowano tabele i obliczenia, na podstawie których wyciągnięto odpowiednie wnioski

Behind the scenes of artificial intelligence: a study of micro-work platforms in France

2019

Este artículo es una versión resumida del informe “Le Micro-travail en France. Derrière l’automatisation de nouvelles précarités au travail?» This article is a summarized version of the report "Le Micro-travail en France. Derrière l’automatisation de nouvelles précarités au travail?" .; International audience; Micro-work internet services allocate small, standardized tasks of data generation and annotation to crowds of providers. The outputs are mainly used to produce artificial intelligence solutions. It is an exemplary instance of the “platformization” of the economy, and of the transformations of labour that digital technologies bring about. To uncover the conditions under which micro-wo…

Due anni di pandemia. Libertà e autorità

2022

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International negotiations in the context of the evolution of international relations: theoretical assumptions and observations

2015

The article considers the importance of international negotiations in the context of changes that have been occurring in international relations, especially after the First World War. The article is divided into four sections that show qualitative changes in the international negotiations in the context of changes which indicate progress in the development and deepening of international relations. In the first chapter, I discuss international opportunities that favor the intensification of international negotiations. The second chapter discusses the actors of international negotiations, indicating that with the evolution of international relations, there expanded the circle of influential p…

Realizzazione di una stazione di misura delle aree proiettate del corpo umano

2003

Mocna kobieta - słaby mężczyzna: demaskatorski mit w twórczości Sidonie-Gabrielle Colette

2020

Colette’s work reveals the evolution of the woman’s self-awareness that took place in the 20th century, when she rejected the then-publicly accepted image of wife and mother. The author of the Claudine series through moral novelty, by addressing issues of gender identity and homosexuality, undermines stereotypes perpetuating inequalities between the sexes and male domination in the private and public sphere. She also changes the traditional way of portraying a woman in literature, creating a new type of heroine who provoked partners while fighting for her own independence.

Use of ethnic humor in modern stand-up comedy

2012

Valore della funzione ricreativa per aree protette siciliane

2008

The valutation of public goods, such as environmental resouces, often cheracterized by a high degree of multifunctionality, is an issue of great interest to local decision mackers, who have therefore the opportunity of improving planning and programming tools in relation to protection, use regulation and exploitation of natural resources. In this paper some results are briefly reporter about two direct surveys carried out in two important Natural Oriented Reserve in Sicily. The main aim of the study is to support in the process of territorial planning providing them with visitors' profiles, with the findings of a Customer Satisfaction Analysis and with the economic value concerning the tour…