Spontaneous Growth of CaBi4Ti4O15 Piezoelectric Crystal Using Mixed Flux Agents

The bismuth layer-structured ferroelectrics (BLSFs) materials have potential for high-temperature piezoelectric applications. Among these piezoelectric materials, the CaBi4Ti4O15 (CBT) piezoelectric ceramic with a high decomposition temperature of about 1250 °C attracts a lot of attention. Achieving a CBT single crystal is a significant way to improve its piezoelectric properties. For this purpose, the flux system for growing CBT crystal was explored in this study. The optimum flux composition ratio was found to be PbO:B2O3:CBT = 3:3:1 in mol%, where the PbO–B2O3 mixtures were used as a flux system. Millimeter size flake-shaped CBT crystals were obtained using the spontaneous growth process for the first time. The relationship between the crystal structure and flake growth habit was analyzed. In addition, the bandgap was evaluated by the combination of transmittance spectrum and first-principle calculations. Besides, the piezoelectric property was predicted from the perspective of polyhedral distortion, which indicated the potential of CBT crystal for piezoelectric applications.

Download Full-text

Analysis of the Piezoelectric Properties of Aligned Multi-Walled Carbon Nanotubes

Nanomaterials ◽

10.3390/nano11112912 ◽

2021 ◽

Vol 11 (11) ◽

pp. 2912

Author(s):

Marina V. Il’ina ◽

Oleg I. Il’in ◽

Nikolay N. Rudyk ◽

Olga I. Osotova ◽

Alexander A. Fedotov ◽

...

Keyword(s):

Carbon Nanotubes ◽

Graphene Sheet ◽

Carbon Nanostructures ◽

Piezoelectric Coefficient ◽

Piezoelectric Properties ◽

Sheet Surface ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

First Time ◽

The Relationship

Recent studies reveal that carbon nanostructures show anomalous piezoelectric properties when the central symmetry of their structure is violated. Particular focus is given to carbon nanotubes (CNTs) with initial significant curvature of the graphene sheet surface, which leads to an asymmetric redistribution of the electron density. This paper presents the results of studies on the piezoelectric properties of aligned multi-walled CNTs. An original technique for evaluating the effective piezoelectric coefficient of CNTs is presented. For the first time, in this study, we investigate the influence of the growth temperature and thickness of the catalytic Ni layer on the value of the piezoelectric coefficient of CNTs. We establish the relationship between the effective piezoelectric coefficient of CNTs and their defectiveness and diameter, which determines the curvature of the graphene sheet surface. The calculated values of the effective piezoelectric coefficient of CNTs are shown to be between 0.019 and 0.413 C/m2, depending on the degree of their defectiveness and diameter.

Download Full-text

Affirmative Action and Leadership Attitudes in Brazilian Women Managers

Journal of Personnel Psychology ◽

10.1027/1866-5888/a000039 ◽

2011 ◽

Vol 10 (3) ◽

pp. 139-143 ◽

Cited By ~ 3

Author(s):

Gazi Islam ◽

Sarah E. S. Zilenovsky

Keyword(s):

Affirmative Action ◽

Latin American ◽

Women Managers ◽

Psychological Effects ◽

Preferential Selection ◽

Justice Perceptions ◽

First Time ◽

The Relationship

This note examines the relationship between affirmative action (AA) program perceptions and women’s self-ascribed capacity and desire to become leaders. We propose that women who believe that their organization implements a program of preferential selection toward women will experience negative psychological effects leading to lowered self-expectations for leadership, but that this effect will be moderated by their justice perceptions of AA programs. We test this proposition empirically for the first time with a Latin American female sample. Among Brazilian women managers, desire but not self-ascribed capacity to lead was reduced when they believed an AA policy was in place. Both desire’s and capacity’s relationships with belief in an AA policy were moderated by justice perceptions.

Download Full-text

ЗУБРЫ НА СЕВЕРЕ РОССИИ — НАСТОЯЩЕЕ И БУДУЩЕЕ

Molochnoe i miasnoe skotovodstvo ◽

10.33943/mms.2019.3.31722 ◽

2019 ◽

pp. 42-44

Author(s):

I.V. GUSAROV ◽

V.A. OSTAPENKO ◽

T.V. NOVIKOVА

Keyword(s):

Biological Diversity ◽

Climatic Conditions ◽

Economic Consequences ◽

European Bison ◽

Rare And Endangered Species ◽

The North ◽

Rare And Endangered ◽

Relationship Of ◽

First Time ◽

The Relationship

Впервые в мире создана популяция зубров на территории 60 градусов северной широты. В новых климатических условиях разведения и сохранения зубров определены и проанализированы факторы существования вида на севере Европейской части РФ. Выявлены признаки, динамика численности, которые являются составной частью системы, предназначенной для управления биоразнообразием. Интродукция, являясь процессом введения в экосистему нехарактерных для нее видов, может усиливать изменения биоценозов как положительно, так и отрицательно. Насколько быстро и успешно проходит процесс адаптации заселенного вида, и усматривается его влияние на окружающую среду зависит дальнейшее существование зубров и в целом биоразнообразия. В статье обсуждаются вопросы взаимоотношения зубров с другими видами копытных и хозяйственной деятельностью человека, а также дальнейшим использованием зубров в сельскохозяйственном производстве. Пластичность зубров, выявление изменений и их анализ при вселении видов в новые условия обитания необходимы не только для определения развития или деградации биоценозов и в целом экосистемы, но и прогноза социально-экономических последствий интродукции как одного из методов сохранения редких и исчезающих видов фауны.For the first time in the world, a bison population has been created in an area of 60 degrees north latitude. In the new climatic conditions of breeding and preservation of bison, the factors of the species existence in the north of the European part of the Russian Federation are identified and analyzed. The signs, dynamics of abundance, which are an integral part of the system designed to manage biodiversity are identified, since the preservation of biological diversity on the planet is one of the main problems of our time. Introduction, being the process of introducing non-typical species into an ecosystem, can enhance changes in biocenoses, both positively and negatively. The question posing sounds especially when it comes to such a large hoofed animal as the European bison. How quickly and successfully the process of adaptation of the universe takes place and its environmental impact is seen depends on the continued existence of bison and biodiversity in general. The article discusses the relationship of bison with other types of ungulates and human activities, as well as the further use of bison in agricultural production. How these issues will be resolved positively depends on the future of these animals. Thus, the plasticity of bison, the identification of changes and their analysis, with the introduction of species into new habitat conditions is necessary not only to determine the development or degradation of biocenoses and the ecosystem as a whole, but also to predict the socio-economic consequences due to the introduction as one of the methods of preserving rare and endangered species of fauna.

Download Full-text

Anisotropic Elasticity

10.1093/oso/9780195074475.001.0001 ◽

1996 ◽

Cited By ~ 35

Author(s):

T. T. C. Ting

Keyword(s):

Composite Materials ◽

Elastic Constants ◽

Piezoelectric Materials ◽

Anisotropic Materials ◽

Anisotropic Elasticity ◽

Stress Singularities ◽

Comprehensive Survey ◽

The Subject ◽

Key Topics ◽

First Time

Anisotropic Elasticity offers for the first time a comprehensive survey of the analysis of anisotropic materials that can have up to twenty-one elastic constants. Focusing on the mathematically elegant and technically powerful Stroh formalism as a means to understanding the subject, the author tackles a broad range of key topics, including antiplane deformations, Green's functions, stress singularities in composite materials, elliptic inclusions, cracks, thermo-elasticity, and piezoelectric materials, among many others. Well written, theoretically rigorous, and practically oriented, the book will be welcomed by students and researchers alike.

Download Full-text

A University Education

10.1093/oso/9780198767268.001.0001 ◽

2017 ◽

Cited By ~ 7

Author(s):

David Willetts

Keyword(s):

Higher Education ◽

Modern Society ◽

University Education ◽

Modern World ◽

Controversial Issues ◽

The Us ◽

The Individual ◽

The University ◽

First Time ◽

The Relationship

Universities have a crucial role in the modern world. In England, entrance to universities is by nation-wide competition which means English universities have an exceptional influence on schools--a striking theme of the book. This important book first investigates the university as an institution and then tracks the individual on their journey to and through university. In A University Education, David Willetts presents a compelling case for the ongoing importance of the university, both as one of the great institutions of modern society and as a transformational experience for the individual. The book also makes illuminating comparisons with higher education in other countries, especially the US and Germany. Drawing on his experience as UK Minister for Universities and Science from 2010 to 2014, the author offers a powerful account of the value of higher education and the case for more expansion. He covers controversial issues in which he was involved from access for disadvantaged students to the introduction of L9,000 fees. The final section addresses some of the big questions for the future, such as the the relationship between universities and business, especially in promoting innovation.. He argues that the two great contemporary trends of globalisation and technological innovation will both change the university significantly. This is an authoritative account of English universities setting them for the first time in their new legal and regulatory framework.

Download Full-text

Variation in VKORC1 Is Associated with Vascular Dementia

Journal of Alzheimer s Disease ◽

10.3233/jad-201256 ◽

2021 ◽

Vol 80 (3) ◽

pp. 1329-1337

Author(s):

Jure Mur ◽

Daniel L. McCartney ◽

Daniel I. Chasman ◽

Peter M. Visscher ◽

Graciela Muniz-Terrera ◽

...

Keyword(s):

Atrial Fibrillation ◽

Vascular Dementia ◽

Genetic Variant ◽

Warfarin Dose ◽

Uk Biobank ◽

Parental History ◽

Genome Wide ◽

History Of ◽

First Time ◽

The Relationship

Background: The genetic variant rs9923231 (VKORC1) is associated with differences in the coagulation of blood and consequentially with sensitivity to the drug warfarin. Variation in VKORC1 has been linked in a gene-based test to dementia/Alzheimer’s disease in the parents of participants, with suggestive evidence for an association for rs9923231 (p = 1.8×10–7), which was included in the genome-wide significant KAT8 locus. Objective: Our study aimed to investigate whether the relationship between rs9923231 and dementia persists only for certain dementia sub-types, and if those taking warfarin are at greater risk. Methods: We used logistic regression and data from 238,195 participants from UK Biobank to examine the relationship between VKORC1, risk of dementia, and the interplay with warfarin use. Results: Parental history of dementia, APOE variant, atrial fibrillation, diabetes, hypertension, and hypercholesterolemia all had strong associations with vascular dementia (p < 4.6×10–6). The T-allele in rs9923231 was linked to a lower warfarin dose (βperT - allele = –0.29, p < 2×10–16) and risk of vascular dementia (OR = 1.17, p = 0.010), but not other dementia sub-types. However, the risk of vascular dementia was not affected by warfarin use in carriers of the T-allele. Conclusion: Our study reports for the first time an association between rs9923231 and vascular dementia, but further research is warranted to explore potential mechanisms and specify the relationship between rs9923231 and features of vascular dementia.

Download Full-text

ACE2 Is an Adjacent Element of Atherosclerosis and COVID-19 Pathogenesis

International Journal of Molecular Sciences ◽

10.3390/ijms22094691 ◽

2021 ◽

Vol 22 (9) ◽

pp. 4691

Author(s):

Anastasia V. Poznyak ◽

Evgeny E. Bezsonov ◽

Ali H. Eid ◽

Tatyana V. Popkova ◽

Ludmila V. Nedosugova ◽

...

Keyword(s):

Cardiovascular System ◽

Renin Angiotensin System ◽

Myocardial Damage ◽

Angiotensin Converting Enzyme 2 ◽

Adjacent Element ◽

Chinese Province ◽

Coronavirus Infection ◽

First Time ◽

The Relationship ◽

Interspecies Barrier

COVID-19 is a highly contagious new infection caused by the single-stranded RNA Sars-CoV-2 virus. For the first time, this infection was recorded in December 2019 in the Chinese province of Wuhan. The virus presumably crossed the interspecies barrier and passed to humans from a bat. Initially, the disease was considered exclusively in the context of damage to the respiratory system, but it quickly became clear that the disease also entails serious consequences from various systems, including the cardiovascular system. Among these consequences are myocarditis, myocardial damage, subsequent heart failure, myocardial infarction, and Takotsubo syndrome. On the other hand, clinical data indicate that the presence of chronic diseases in a patient aggravates the course and outcome of coronavirus infection. In this context, the relationship between COVID-19 and atherosclerosis, a condition preceding cardiovascular disease and other disorders of the heart and blood vessels, is particularly interesting. The renin-angiotensin system is essential for the pathogenesis of both coronavirus disease and atherosclerosis. In particular, it has been shown that ACE2, an angiotensin-converting enzyme 2, plays a key role in Sars-CoV-2 infection due to its receptor activity. It is noteworthy that this enzyme is important for the normal functioning of the cardiovascular system. Disruptions in its production and functioning can lead to various disorders, including atherosclerosis.

Download Full-text

“Quelques misérables places à remplir”Locating Shaped Painting in Eighteenth-Century France

Zeitschrift für Kunstgeschichte ◽

10.1515/zkg-2017-0029 ◽

2017 ◽

Vol 80 (4) ◽

pp. 544-571

Author(s):

David Pullins

Keyword(s):

Eighteenth Century ◽

Visual Field ◽

Decorative Arts ◽

Relationship Of ◽

First Time ◽

The Relationship

Abstract This article addresses in depth for the first time the irregularly shaped canvases known as tableaux chantournés (cut-out paintings) that were produced in vast numbers by leading academicians between the 1730s and 1750s and occupy a tenuous place between fine and applied or decorative arts. Through an examination of the term’s first uses in regard to painting and eighteenth-century critics’ responses to these works, tableaux chantournés are positioned as a means of rethinking the extraction of painting from a richer visual field and the relationship of this medium-specific agenda to the historiography of the rococo.

Download Full-text

Sicily Before the Greeks. The Interaction with Aegean and the Levant in the Pre-colonial Era

Open Archaeology ◽

10.1515/opar-2020-0107 ◽

2020 ◽

Vol 6 (1) ◽

pp. 172-205

Author(s):

Davide Tanasi

Keyword(s):

Material Culture ◽

Complex Dynamics ◽

Eastern Mediterranean ◽

Colonial Era ◽

Local Material ◽

Gradual Process ◽

Multiple Variables ◽

New Perspective ◽

First Time ◽

The Relationship

AbstractThe relationship between Sicily and the eastern Mediterranean – namely Aegean, Cyprus and the Levant – represents one of the most intriguing facets of the prehistory of the island. The frequent and periodical contact with foreign cultures were a trigger for a gradual process of socio-political evolution of the indigenous community. Such relationship, already in inception during the Neolithic and the Copper Age, grew into a cultural phenomenon ruled by complex dynamics and multiple variables that ranged from the Mid-3rd to the end of the 2nd millennium BCE. In over 1,500 years, a very large quantity of Aegean and Levantine type materials have been identified in Sicily alongside with example of unusual local material culture traditionally interpreted as resulting from external influence. To summarize all the evidence during such long period and critically address it in order to attempt historical reconstructions is a Herculean labor.Twenty years after Sebastiano Tusa embraced this challenge for the first time, this paper takes stock on two decades of new discoveries and research reassessing a vast amount of literature, mostly published in Italian and in regional journals, while also address the outcomes of new archaeometric studies. The in-depth survey offers a new perspective of general trends in this East-West relationship which conditioned the subsequent events of the Greek and Phoenician colonization of Sicily.

Download Full-text

Deservingness for "Family 500 +" Benefit in Poland: Qualitative Study of Internet Debates

Social Indicators Research ◽

10.1007/s11205-021-02655-1 ◽

2021 ◽

Author(s):

Piotr Michoń

Keyword(s):

Future Research ◽

Online Forums ◽

Time Data ◽

Social Surveys ◽

Cash Benefit ◽

Internet Forums ◽

Welfare Attitudes ◽

New Criterion ◽

First Time ◽

The Relationship

AbstractThe need for qualitative research of deservingness perception is strongly emphasised in the literature. This article studies the perception of deservingness for a "Family 500 +"—cash benefit in Poland. For the first time, data from online forums was used in the studies of deservingness and welfare attitudes. It allowed to avoid numerous limitations associated with social surveys. The qualitative analysis showed how participants of Internet debates perceive the criteria of deservingness: control, attitude, reciprocity, identity, need, and what are the relations between the criteria. The impurity of all deservingness criteria was indicated and a new criterion “adequacy” was proposed. Moreover due to the fact that the study concerned a concrete, non-abstract family cash benefit addressed the relationship between the perceived deservingness of children and their parents was pointed out. The vast majority of posts on Internet forums referred to deservingness of parents, not children. This is particularly evident in relation to the criteria of control and reciprocity. Presenting the hypothesis of jealousy and scapegoat strategy, the article also shows the direction of future research on deservingness.

Download Full-text