scholarly journals Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR

2018 ◽  
Vol 3 (3) ◽  
pp. 23 ◽  
Author(s):  
Steven Reichardt ◽  
Michael Jurkutat ◽  
Robin Guehne ◽  
Jonas Kohlrautz ◽  
Andreas Erb ◽  
...  
Keyword(s):  
Cuprate Superconductors ◽  
Cuo2 Plane ◽  
Charge Ordering ◽  
Electronic Charge ◽  
Ambient Conditions ◽  
Open Questions ◽  
Bulk Charge ◽  
A Charge ◽  
Degree Of Order

Cuprate superconductors still hold many open questions, and recently, the role of symmetry breaking electronic charge ordering resurfaced in underdoped cuprates as a phenomenon that competes with superconductivity. Here, unambiguous nuclear magnetic resonance (NMR) proof is presented for the existence of local charge ordering in nearly optimally doped YBa2Cu3O6.9, even up to room temperature. Increasing pressure and decreasing temperature leads to the highest degree of order in the sense that the two oxygen atoms of the unit cell of the CuO2 plane develop a charge difference of about 0.02 holes, and order throughout the whole crystal. At ambient conditions, a slightly smaller charge difference and a decreased order is found. Evidence from literature data suggests that this charge ordering is ubiquitous to the CuO2 plane of all cuprates. Thus, the role of charge ordering in the cuprates must be reassessed.

scholarly journals MONOLAYER CHARGED QUANTUM FILMS: A QUANTUM SIMULATION STUDY

2006 ◽  
Vol 20 (19) ◽  
pp. 2667-2676 ◽  
Author(s):  
KEOLA WIERSCHEM ◽  
EFSTRATIOS MANOUSAKIS
Keyword(s):  
Long Range ◽  
Cuprate Superconductors ◽  
Solid Phase ◽  
Fluid Phase ◽  
Relative Strength ◽  
Electron Pairs ◽  
Natural Tendency ◽  
Repulsive Coulomb ◽  
A Charge

We use path-integral Monte Carlo (PIMC) to study the effects of adding a long-range repulsive Coulomb interaction to the usual Van der Waals interaction between two atoms of a submonolayer quantum film such as helium on graphite or a pure two-dimensional superfluid. Such interactions frustrate or compete with the natural tendency of the system for phase separation namely to form a macroscopic liquid or solid phase. We find that as a function of the relative strength of the long-range repulsion, surface coverage and temperature, the system undergoes a series of transformations, including a triangular Wigner-like crystal of clusters, a charge stripe-ordered phase and a fluid phase. The goal of these studies is to understand the role of quantum fluctuations when such competing interactions appear together with formation of preexisting electron pairs as might be the case in cuprate superconductors.

scholarly journals Farm Animals Are Long Away from Natural Behavior: Open Questions and Operative Consequences on Animal Welfare

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 724
Author(s):  
Alberto Cesarani ◽  
Giuseppe Pulina
Keyword(s):  
Animal Welfare ◽  
Farm Animal ◽  
Farm Animals ◽  
Natural State ◽  
Natural Behavior ◽  
Welfare Assessment ◽  
Open Questions ◽  
Naive Approach

The concept of welfare applied to farm animals has undergone a remarkable evolution. The growing awareness of citizens pushes farmers to guarantee the highest possible level of welfare to their animals. New perspectives could be opened for animal welfare reasoning around the concept of domestic, especially farm, animals as partial human artifacts. Therefore, it is important to understand how much a particular behavior of a farm animal is far from the natural one of its ancestors. This paper is a contribution to better understand the role of genetics of the farm animals on their behavior. This means that the naïve approach to animal welfare regarding returning animals to their natural state should be challenged and that welfare assessment should be considered.

scholarly journals miR-205 in Breast Cancer: State of the Art

2020 ◽  
Vol 22 (1) ◽  
pp. 27
Author(s):  
Ilaria Plantamura ◽  
Alessandra Cataldo ◽  
Giulia Cosentino ◽  
Marilena V. Iorio
Keyword(s):  
Breast Cancer ◽  
Cancer Progression ◽  
Normal Breast ◽  
Response To Therapy ◽  
Aberrant Expression ◽  
Open Questions ◽  
Tumor Tissues ◽  
Breast Physiology ◽  
Cancer Types

Despite its controversial roles in different cancer types, miR-205 has been mainly described as an oncosuppressive microRNA (miRNA), with some contrasting results, in breast cancer. The role of miR-205 in the occurrence or progression of breast cancer has been extensively studied since the first evidence of its aberrant expression in tumor tissues versus normal counterparts. To date, it is known that the expression of miR-205 in the different subtypes of breast cancer is decreasing from the less aggressive subtype, estrogen receptor/progesterone receptor positive breast cancer, to the more aggressive, triple negative breast cancer, influencing metastasis capability, response to therapy and patient survival. In this review, we summarize the most important discoveries that have highlighted the functional role of this miRNA in breast cancer initiation and progression, in stemness maintenance, in the tumor microenvironment, its potential role as a biomarker and its relevance in normal breast physiology—the still open questions. Finally, emerging evidence reveals the role of some lncRNAs in breast cancer progression as sponges of miR-205. Here, we also reviewed the studies in this field.

scholarly journals How Can Psychological Science Help Counter the Spread of Fake News?

2021 ◽  
Vol 24 ◽  
Author(s):  
Sander van der Linden ◽  
Jon Roozenbeek ◽  
Rakoen Maertens ◽  
Melisa Basol ◽  
Ondřej Kácha ◽  
...  
Keyword(s):  
Research Agenda ◽  
Source Credibility ◽  
Fake News ◽  
Intervention Effectiveness ◽  
Motivated Cognition ◽  
Individual Level ◽  
Psychological Science ◽  
Open Questions ◽  
The Individual

Abstract In recent years, interest in the psychology of fake news has rapidly increased. We outline the various interventions within psychological science aimed at countering the spread of fake news and misinformation online, focusing primarily on corrective (debunking) and pre-emptive (prebunking) approaches. We also offer a research agenda of open questions within the field of psychological science that relate to how and why fake news spreads and how best to counter it: the longevity of intervention effectiveness; the role of sources and source credibility; whether the sharing of fake news is best explained by the motivated cognition or the inattention accounts; and the complexities of developing psychometrically validated instruments to measure how interventions affect susceptibility to fake news at the individual level.

scholarly journals The role of spin in the degradation of organic photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ivan Ramirez ◽  
Alberto Privitera ◽  
Safakath Karuthedath ◽  
Anna Jungbluth ◽  
Johannes Benduhn ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Bulk Heterojunction ◽  
Critical Factor ◽  
Model Systems ◽  
Transient Absorption Spectroscopy ◽  
Triplet States ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
A Charge

AbstractStability is now a critical factor in the commercialization of organic photovoltaic (OPV) devices. Both extrinsic stability to oxygen and water and intrinsic stability to light and heat in inert conditions must be achieved. Triplet states are known to be problematic in both cases, leading to singlet oxygen production or fullerene dimerization. The latter is thought to proceed from unquenched singlet excitons that have undergone intersystem crossing (ISC). Instead, we show that in bulk heterojunction (BHJ) solar cells the photo-degradation of C60 via photo-oligomerization occurs primarily via back-hole transfer (BHT) from a charge-transfer state to a C60 excited triplet state. We demonstrate this to be the principal pathway from a combination of steady-state optoelectronic measurements, time-resolved electron paramagnetic resonance, and temperature-dependent transient absorption spectroscopy on model systems. BHT is a much more serious concern than ISC because it cannot be mitigated by improved exciton quenching, obtained for example by a finer BHJ morphology. As BHT is not specific to fullerenes, our results suggest that the role of electron and hole back transfer in the degradation of BHJs should also be carefully considered when designing stable OPV devices.

Unveiling the Role of Sulfur in Rapid Defluorination of Florfenicol by Sulfidized Nanoscale Zero-Valent Iron in Water under Ambient Conditions

2021 ◽  
Vol 55 (4) ◽  
pp. 2628-2638
Author(s):  
Zhen Cao ◽  
Hao Li ◽  
Gregory V. Lowry ◽  
Xiaoyang Shi ◽  
Xiangcheng Pan ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Ambient Conditions ◽  
Nanoscale Zero Valent Iron

The Saint with Indra's Sword: Khruubaa Srivichai and Buddhist Millenarianism in Northern Thailand

2014 ◽  
Vol 56 (3) ◽  
pp. 681-713 ◽  
Author(s):  
Katherine Bowie
Keyword(s):  
Political Economy ◽  
The State ◽  
Capital City ◽  
The Political ◽  
Northern Thailand ◽  
Present Evidence ◽  
Modern Context ◽  
A Charge ◽  
Social Causes

AbstractDespite a growing literature revealing the presence of millenarian movements in both Theravada and Mahayana Buddhist societies, scholars have been remarkably reluctant to consider the role of messianic beliefs in Buddhist societies. Khruubaa Srivichai (1878–1938) is the most famous monk of northern Thailand and is widely revered as atonbun, or saint. Althoughtonbunhas been depoliticized in the modern context, the term also refers to a savior who is an incarnation of the coming Maitreya Buddha. In 1920 Srivichai was sent under arrest to the capital city of Bangkok to face eight charges. This essay focuses on the charge that he claimed to possess the god Indra's sword. Although this charge has been widely ignored, it was in fact a charge of treason. In this essay, I argue that the treason charge should be understood within the context of Buddhist millenarianism. I note the saint/savior tropes in Srivichai's mytho-biography, describe the prevalence of millenarianism in the region, and detail the political economy of the decade of the 1910s prior to Srivichai's detention. I present evidence to show that the decade was characterized by famine, dislocation, disease, and other disasters of both natural and social causes. Such hardships would have been consistent with apocalyptic omens in the Buddhist repertoire portending the advent of Maitreya. Understanding Srivichai in this millenarian context helps to explain both the hopes of the populace and the fears of the state during that tumultuous decade.

Detailed Performance Analysis of a 10kW Dish∕Stirling System

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
W. Reinalter ◽  
S. Ulmer ◽  
P. Heller ◽  
T. Rauch ◽  
J.-M. Gineste ◽  
...  
Keyword(s):  
Electric Energy ◽  
Optical Quality ◽  
Stirling Engine ◽  
Thermodynamic Efficiency ◽  
Ambient Conditions ◽  
Camera System ◽  
Charge Coupled Device ◽  
Mapping System ◽  
Conversion Unit ◽  
A Charge

The CNRS-Promes dish∕Stirling system was erected in Jun. 2004 as the last of three country reference units built in the “Envirodish” project. It represents the latest development step of the EuroDish system with many improved components. With a measured peak of 11kW electrical output power, it is also the best performing system so far. The measurement campaign to determine the optical and thermodynamic efficiency of the system is presented. The optical quality of the concentrator and the energy input to the power conversion unit was measured with a classical flux-mapping system using a Lambertian target and a charge coupled device camera system. An efficiency of the concentrator including the intercept losses of 74.4% could be defined for this particular system. For the thermodynamic analysis all the data necessary for a complete energy balance around the Stirling engine were measured or approximated by calculations. For the given ambient conditions during the tests, a Stirling engine efficiency of 39.4% could be measured. The overall efficiency for the conversion of solar to electric energy was 22.5%.

Invisible and Intangible, but Undeniable: Role of Ambient Conditions in Building Hotel Guests’ Loyalty

2014 ◽  
Vol 24 (7) ◽  
pp. 727-753 ◽  
Author(s):  
Myoungsun Suh ◽  
Hyoungeun Moon ◽  
Heesup Han ◽  
Sunny Ham
Keyword(s):  
Ambient Conditions
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