Etude de la dissolution du bromure cuivreux formé sur le cuivre

1984 ◽  
Vol 62 (6) ◽  
pp. 1112-1119 ◽  
Author(s):  
Robert-Louis Brossard
Keyword(s):  
Corrosion Product ◽  
Open Circuit ◽  
Complete Disappearance ◽  
Rotating Disc ◽  
Rapid Fall ◽  
Stationary Electrode ◽  
Definition Of ◽  
Local Enrichment ◽  
Almost All ◽  
A Current

The dissolution of cuprous bromide, formed by the electrochemical oxidation of copper immersed in aqueous NaBr, has been studied. NaBr concentration was varied between 0.1 and 1.2 M at pH 4. The corrosion product accumulating on the electrode is crystalline γ-CuBr. The presence of this material contributes to the local enrichment of dissolved copper close to the electrode. This enrichment leads to a characteristic electrode voltage in open circuit, which is about −149 mV (ECS) at a stationary electrode immersed in a solution of 0.2 M NaBr. The complete dissolution of CuBr coincides with a rapid fall in voltage which permits the definition of the transition time τ from which the speed of CuBr dissolution has been calculated. For example, the speed of dissolution is 0.074 ± 0.003 mA cm−2 in a current equivalent for a stationary electrode in the presence of a non-stirred solution of 0.2 M NaBr. This is constant until the complete disappearance of the CuBr. On the other hand, use of a rotating disc electrode demonstrates that the dissolution is entirely dominated by the diffusion of ions in the liquid phase. The experimental results are compatible with the simultaneous presence of [Formula: see text] and [Formula: see text] as diffusing species. Finally, the potentiodynamic polarization curves show two oxidation waves. A non-negligible portion of the dissolution current, if not almost all, is associated with the formation of CuBr as the sole corrosion product on the electrode. [Journal translation]

La dissolution du chlorure cuivreux formé par oxydation électrochimique du cuivre

1982 ◽  
Vol 60 (5) ◽  
pp. 616-623 ◽  
Author(s):  
Robert-Louis Brossard
Keyword(s):  
Copper Chloride ◽  
Ionic Species ◽  
Open Circuit ◽  
Complete Disappearance ◽  
Rotating Disc ◽  
Electrode Voltage ◽  
Stationary Electrode ◽  
Local Enrichment ◽  
Rapid Drop ◽  
A Current

We have studied the dissolution of copper chloride formed by the electrochemical oxidation of copper immersed in aqueous lithium chloride. The pH was maintained between 3 and 5 while the concentration of LiCl in solution was varied between 2.36 × 10−2 M to 16.5 × 10−2 M. The corrosion product accumulating on the electrode consists of crystals of nantokite (CuCl) formed by precipitation.The presence of this precipitate contributes to the local enrichment of the solution which is close to saturation near the electrode. This enrichment is revealed by an electrode voltage in a well characterized open circuit. This current is about −40 mV (/ECS) on a stationary electrode. The complete dissolution of CuCl coincides with a rapid drop in voltage which allows the transition time τ to be defined from which the speed of dissolution of CuCl has been calculated. For example, the speed of dissolution is 0.15 ± 0.01 mC s−1 cm2 in a current equivalent for a stationary electrode in the presence of 2.36 × 10−2 M of dissolved LiCl. This is also constant until the complete disappearance of the precipitate.In another study, the use of a rotating disc electrode shows that the dissolution is completely dominated by the diffusion of ionic species in the liquid phase. The experimental results are compatible with the presence of CuCl2− as the diffusing species. [Journal Translation]

Diversidad sexual e Intervención Social: reflexiones desde el Trabajo Social

2016 ◽  
pp. 81
Author(s):  
Rodrigo Azocar González
Keyword(s):  
Social Work ◽  
Social Intervention ◽  
Sexual Diversity ◽  
Current Group ◽  
Current Article ◽  
Trabajo Social ◽  
Definition Of ◽  
Los Grupos ◽  
A Current

RESUMENEl presente artículo es fruto de una investigación de largo alcance que busca generar discusión en torno a los desafíos contemporáneos del Trabajo Social en la construcción de alternativas de intervención social en contextos de diversidad sexual en Chile. La crisis de la norma heterosexual refleja una contemporaneidad marcada por la visibilidad de los grupos históricamente excluidos, reflejo de la sensibilización y cuestionamiento de una masculinidad dominante intrínsecamente exclusora e inalcanzable, como también de procesos de posicionamiento político y cultural de un colectivo presente, pero hasta hace poco invisibilizado, en nuestro país. A través de técnicas etnográficas y la incorporación del concepto de mercado como vehículo de visibilidad, el trabajo propone ideas coherentes con la construcción de una praxis transdisciplinar que responde a la nueva definición de Trabajo Social, en discusión a nivel mundial, como de los procesos de cuestionamiento y mudanza ciudadanos revitalizados en la última década.Palabras clave: Intervención social, diversidad sexual, trabajo social, desafíos. Diversidade sexual e intervenção social: reflexões a partir do Trabalho SocialRESUMOO presente artigo é o resultado de uma pesquisa de longo alcance que procura gerar discussão em relação aos desafios contemporâneos do Trabalho Social na construção de alternativas de intervenção social em contextos de diversidade sexual no Chile. A crise da norma heterossexual reflete uma contemporaneidade marcada pela visibilidade dos grupos historicamente excluídos, reflexo da conscientização e questionamento de uma masculinidade dominante intrinsecamente que exclui e que se apresenta como inatingível, bem como processos de posicionamento político e cultural de um coletivo presente, mas até recentemente invisível em nosso país. Através de técnicas etnográficas e incorporação do conceito de mercado como veículo de visibilidade, o trabalho propõe ideias coerentes com a construçãode uma prática transdisciplinar que respondam à nova definição de TrabalhoSocial, discutido mundialmente, como dos processos de questionamento emudança cidadã revitalizados na última década.Palavras-chave: intervenção social, diversidade sexual, trabalho social,desafios. Sexual diversity and social intervention: Reflections fromsocial workABSTRACTThe current article is the result of a wider research that seeks to generatediscussion about the actual challenges of social work in the constructionof alternatives of social intervention on sexual diversity contexts in Chile.The crisis of the heterosexual regulation reflects a contemporaneity markedby the visibility of the historically excluded groups, as a reflection of thesensitivity and questioning of a dominant manhood inherently excluder andunreachable, as political and positioning processes of a current group, butuntil recently hidden in our country. Through ethnographic technics and theincorporation of the concept of market as a vehicle of visibility, this worksproposes ideas coherent with the construction of a cross-curricular praxisthat responds to the new definition of social work, globally discussed, as wellas the questioning processes and citizen movements during last decade.Keywords: Social intervention, sexual diversity, social work, challenges

scholarly journals Frege’s puzzle and the ex ante Pareto principle

2020 ◽  
Author(s):  
Anna Mahtani
Keyword(s):  
Policy Choice ◽  
Choice Situation ◽  
Pareto Principle ◽  
Social Situations ◽  
Central Importance ◽  
Ex Ante ◽  
Definition Of ◽  
Almost All ◽  
Rational Behaviour ◽  
Fixed Population

Abstract The ex ante Pareto principle has an intuitive pull, and it has been a principle of central importance since Harsanyi’s defence of utilitarianism (to be found in e.g. Harsanyi, Rational behaviour and bargaining equilibrium in games and social situations. CUP, Cambridge, 1977). The principle has been used to criticize and refine a range of positions in welfare economics, including egalitarianism and prioritarianism. But this principle faces a serious problem. I have argued elsewhere (Mahtani, J Philos 114(6):303-323 2017) that the concept of ex ante Pareto superiority is not well defined, because its application in a choice situation concerning a fixed population can depend on how the members of that population are designated. I show in this paper that in almost all cases of policy choice, there will be numerous sets of rival designators for the same fixed population. I explore two ways that we might complete the definition of ex ante Pareto superiority. I call these the ‘supervaluationist’ reading and the ‘subvaluationist’ reading. I reject the subvaluationist reading as uncharitable, and argue that the supervaluationist reading is the most promising interpretation of the ex ante Pareto principle. I end by exploring some of the implications of this principle for prioritarianism and egalitarianism.

scholarly journals Fabrication and Testing of All-solid-state Nanoscale Lithium Batteries Using LiPON for Electrolytes

2018 ◽  
Vol 53 ◽  
pp. 01008
Author(s):  
Feihu Tan ◽  
XiaoPing Liang ◽  
Feng Wei ◽  
Jun Du
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solid State ◽  
Magnetron Sputtering ◽  
Specific Capacity ◽  
Rf Magnetron Sputtering ◽  
Open Circuit ◽  
Working Pressure ◽  
Thin Film Battery ◽  
A Current

The amorphous LiPON thin film was obtained by using the crystalline Li3PO4 target and the RF magnetron sputtering method at a N2 working pressure of 1 Pa. and then the morphology and composition of LiPON thin films are analysed by SEM and EDS. SEM shows that the film was compact and smooth, while EDS shows that the content of N in LiPON thin film was about 17.47%. The electrochemical properties of Pt/LiPON/Pt were analysed by EIS, and the ionic conductivity of LiPON thin films was 3.8×10-7 S/cm. By using the hard mask in the magnetron sputtering process, the all-solid-state thin film battery with Si/Ti/Pt/LiCoO2/LiPON/Li4Ti5O12/Pt structure was prepared, and its electrical properties were studied. As for this thin film battery, the open circuit voltage was 1.9 V and the first discharge specific capacity was 34.7 μAh/cm2·μm at a current density of 5 μA/cm-2, indicating that is promising in all-solidstate thin film batteries.

scholarly journals Legal status of cryptocurrency in Asian countries

2021 ◽  
Vol 66 ◽  
pp. 96-102
Author(s):  
V.M. Logoida
Keyword(s):  
Civil Rights ◽  
Government Regulation ◽  
Legal Status ◽  
Legal Regulation ◽  
Intangible Asset ◽  
Asian Countries ◽  
Legal Nature ◽  
Liberal Approach ◽  
Definition Of ◽  
Almost All

The article is devoted to the study of the experience of legal regulation of the legal status of cryptocurrencies and transactions with them in Asian countries (except for the People's Republic of China and Asian countries - members of the Commonwealth of Independent States, as the author examined them in separate publications). In the article the author, based on the study of regulations, administrative and judicial practice of all major countries in this part of the world, emphasizes the divergent trends in cryptocurrency transactions regulation in the region, when some countries move from a liberal approach to the use of cryptocurrencies to their total ban and vice versa. It is noted that almost all countries in the region give a legal assessment of the payment function of cryptocurrencies, using regulatory or prohibitive approaches, depending on the chosen policy, which indirectly confirms their understanding of the legal nature of cryptocurrencies primarily as a means of payment. At the same time, these countries not only categorically distinguish cryptocurrencies from fiat money issued by central banks, but also mostly avoid the official definition of cryptocurrency as private (decentralized) cash, preferring to qualify them as an intangible asset, virtual asset, digital asset, financial value and even a good or service, which is currently a kind of compromise between political expediency and economic realities. The author also notes that the Asian region is characterized by very active attempts to resolve the legal status of cryptocurrencies at the legislative level, and not just administrative or judicial response to the actual legal relationship, although the progress of different countries in this matter is different. As a result, the author concludes that in the Asian countries considered in the article, there is no same view on the legal nature of cryptocurrency, its qualification as an object of civil rights, and ways to regulate transactions with it (libertarian approach, positive-cryptocurrency approach but with detailed government regulation and control or a completely restrictive policy in relation to the cryptocurrency market).

scholarly journals The Formation of Sulfide Scales on Carbon Steel in Saturated H2S

2020 ◽  
Author(s):  
Noora Alqahtani ◽  
Jiahui Qi ◽  
Aboubakr M. Abdullah ◽  
Nicholas J. Laycock ◽  
Mary P. Ryan
Keyword(s):  
Carbon Steel ◽  
Corrosion Product ◽  
Film Formation ◽  
Open Circuit ◽  
Iron Surface ◽  
Ion Concentration ◽  
Bulk Solution ◽  
Formation Mechanisms ◽  
Structure Thickness ◽  
Circuit Technique

There are three contributing elements of corrosion of Carbon Steel in H₂ S environment: the effect of H2S on water chemistry; electrochemical reactions of the bare iron surface (both anodic and cathodic processes); and the formation and growth of corrosion product layers. The electrochemical reaction commonly contains three stages: first, the reactant transported from the solution (bulk) to the metal surface; then the transfer of the charge reaction on the surface, followed by the reaction product transported away from the iron surface to the bulk solution or the formation and development of the corrosion product which then can decrease the corrosion rate. Development of a robust corrosion model to predict the corrosion process in H2S requires a mechanistic understanding of all these elements. An experimental study was carried out to assess the corrosion of C-steel under open-circuit technique conditions and in solutions at several ranges of time and temperatures. The effect of film composition, morphology, structure, thickness, and ion- concentration of corrosion product films formed on pipeline Carbon Steel in an acid sour solution were examined. The electrochemical behavior of the filmed steel was measured, and the film properties assessed using a range of advanced techniques including Scanning Electron Microscopy (SEM), and Raman spectroscopy (RS). The data will be discussed in terms of film formation mechanisms.

scholarly journals Aproximación teórica y práctica a una propuesta de gestión conjunta: el archivo y la biblioteca de la familia Belmonte-Chico de Guzmán

2019 ◽  
Author(s):  
Camino Sánchez Oliveira
Keyword(s):  
20Th Century ◽  
Management System ◽  
Private Ownership ◽  
Design Elements ◽  
15Th Century ◽  
Definition Of ◽  
Siglo Xx ◽  
A Current

ENGLISH: The paper presents a current research and examines the design elements of a Familiar Heritage Documentary Collection, composed by bibliographical (a library) and archival (a family archive) collections, and, with enough frequency, a collection of objects related to the activities of the generators of these kind of heritage. The objective is to reflect on the definition of an integrator management system, with particular reference to patrimonial conceptualization and organisation documental systems. It is exposed The experience of managing a particular case of private ownership: the library and archive of the Belmonte-Chico de Guzmán family. We refer to a historical collection, of bibliographic and archival character, contributed and generated by the members of the different generations, branches and houses that compose this Castilian family of noble origin, throughout several centuries (from the end of the 15th century to the beginning of the 20th century). SPANISH: Se presenta parte de una investigación en curso, cuyo objetivo es definir y reflexionar sobre los elementos que fundamentan un sistema de gestión de lo que se ha denominado como un Fondo Documental Patrimonial Familiar (FDPF), compuesto por un fondo bibliográfico (una biblioteca), un fondo archivístico (un archivo familiar) y, con bastante frecuencia, una colección de objetos materiales relacionados con las actividades de los generadores del FDPF. El objetivo es reflexionar sobre la definición de un sistema de gestión conjunto en base a su conceptualización patrimonial, a su procesamiento documental y a su funcionalidad, así como atender al tipo de centro a cargo de dicho patrimonio. Se expone la experiencia de gestión de un caso particular de titularidad privada: la biblioteca y el archivo de la familia Belmonte-Chico de Guzmán. Nos referimos a un fondo histórico, de carácter bibliográfico y archivístico, aportado y generado por los miembros de las distintas generaciones, ramas y casas que componen esta familia castellana de origen nobiliario- hidalgo, a lo largo de varios siglos (desde finales del s. XV hasta inicios del siglo XX).

scholarly journals The Tax Cuts and Jobs Act and the Middle Class

2019 ◽  
Vol 26 (01) ◽  
pp. 53
Author(s):  
Deborah Combs ◽  
Brian Nichols
Keyword(s):  
Middle Class ◽  
The United States ◽  
Census Bureau ◽  
Tax Rates ◽  
United States Census ◽  
United States Census Bureau ◽  
Definition Of ◽  
Almost All ◽  
Jobs Act ◽  
Tax Cuts

This paper explores how the tax cuts and jobs act of 2017 impacts middle-class taxpayers by calculating the tax liability at different levels of income and deductions in 2017 versus 2018. The results confirm the statements supporting the positive effect of the tax change for the middle class. The tax cut and jobs act eliminates personal exemptions, changes the standard deductions at various incomes and family sizes, and lowers marginal tax rates. After providing details of the act, this research examines the definition of the U.S. middle class by using prior research from the Pew Research Center, the United States Census Bureau, and the federal reserve to determine which income levels are attributable to the middle class. Then the tax liability for these income classes is calculated for single and married filing jointly taxpayers in both 2017 and 2018 to determine if the tax cuts and jobs act reduces the tax liability for the middle class. The results show that in almost all scenarios the tax liability in 2018 will be lower than in 2017, regardless of whether standard or itemized deductions are taken. The marriage penalty is no longer applicable, and the new tax act provides a substantial benefit to large families

Historical Account or Discourse on Identity? A Reexamination of Fulbe Hegemony and Autochthonous Submission in Banyo

1998 ◽  
Vol 25 ◽  
pp. 93-110 ◽  
Author(s):  
Quentin Gausset
Keyword(s):  
Nineteenth Century ◽  
The Other ◽  
Islamic State ◽  
Local Populations ◽  
Northern Cameroon ◽  
Definition Of ◽  
Historical Accounts ◽  
In The Beginning ◽  
Almost All ◽  
The Military

Traditional accounts of the nineteenth-century Fulbe conquest in northern Cameroon tell roughly the same story: following the example of Usman Dan Fodio in Nigeria, the Fulbe of Cameroon organized in the beginning of the nineteenth century a “jihad” or a “holy war” against the local pagan populations to convert them to Islam and create an Islamic state. The divisions among the local populations and the military superiority of the Fulbe allowed them to conquer almost all northern Cameroon. They forced those who submitted to give an annual tribute of goods and servants, and they raided the other groups. In these traditional accounts the Fulbe are presented as unchallenged masters, while the local populations are depicted as slaves who were powerless over their fate; their role in the conquest of the region and in the administration of the new political order is supposed to have been insignificant.I will show that, on the contrary, in the area of Banyo the Wawa and Bute played a crucial role in the conquest of the sultanate and in its administration. I will then re-examine the cliche that all members of the local populations were the slaves of the Fulbe by distinguishing the fate of the Wawa and Bute on one side from that of the Kwanja and Mambila on the other, and by showing the importance of the Fulbe's identity in shaping the definition of slavery. Finally I will argue that, if the historical accounts found in the scientific literature invariably insist on Fulbe hegemony and minimize the role played by the local populations, it is because those accounts are often based on Fulbe traditions, and because these traditions are remodeled by the Fulbe in order to correspond to their discourse on identity.

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