1,135 research outputs found
Heterogeneous photocatalytic organic synthesis: State-of-the-art and future perspectives
Heterogeneous photocatalytic systems have the potential to provide a green organic synthesis route for a number of industrially important chemicals. Issues remain with lack of selectivity. In this paper, a review is presented on achievements in this field. Parallels are drawn between systems optimised for heterogeneous photocatalytic organic degradation and heterogeneous catalytic organic synthesis. There is much fundamental knowledge that is still missing in this field of research. Parameters that can be manipulated are reaction solvent, pH, photon energy, chosen photocatalyst and its specific properties, and perhaps the use of more than one photocatalyst. Screening of photocatalysts for specific reactions and adapting the reaction conditions may achieve the best selectivity. Unlike the popular case of photocatalysts for organic degradation, the photocatalysts for organic synthesis should be highly customised on a case-by-case basis. Attention should be given to photocatalysts with the potential to be activated by the visible light spectrum, in order to achieve cost effectiveness of the heterogeneous photocatalytic organic synthesis
Multiband effects on beta-FeSe single crystals
We present the upper critical fields Hc2(T) and Hall effect in beta-FeSe
single crystals. The Hc2(T) increases as the temperature is lowered for field
applied parallel and perpendicular to (101), the natural growth facet of the
crystal. The Hc2(T) for both field directions and the anisotropy at low
temperature increase under pressure. Hole carriers are dominant at high
magnetic fields. However, the contribution of electron-type carriers is
significant at low fields and low temperature. Our results show that multiband
effects dominate Hc2(T) and electronic transport in the normal state
The Effects of Cognitive Appraisal and Emotion on Consumer Behavior: The Critical Role of Recollection in the Luxury Cruise Setting
Abstract de la ponencia[EN] The purposes of this study were: (1) to integrate the cognitive appraisal
theory and script theory; (2) to examine the bonding character of
recollection; and (3) to assess the relationships between consumers
‘appraisals, positive/negative emotions, recollection, storytelling and
repurchase intention. A review of previous studies revealed 14 theoretical
hypotheses. The proposed hypotheses were tested utilizing data collected
from 300 luxury cruise passengers. Confirmatory factor analysis and
structural equation modeling were utilized to test the proposed theoretical
relationships. According to the results, this work was the first to integrate the
cognitive appraisal approach and script theory and also depicted a new
angle from which marketers can better understand cruise travelers’ behaviorJoo, E.; Shin, H.; Kim, I.; Choi, J.; Jang, J.; Hyun, S. (2016). The Effects of Cognitive Appraisal and Emotion on Consumer Behavior: The Critical Role of Recollection in the Luxury Cruise Setting. En CARMA 2016: 1st International Conference on Advanced Research Methods in Analytics. Editorial Universitat Politècnica de València. 167-167. https://doi.org/10.4995/CARMA2016.2015.3135OCS16716
Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime
Eigenstate multifractality is a distinctive feature of non-interacting
disordered metals close to a metal-insulator transition, whose properties are
expected to extend to superconductivity. While multifractality in three
dimensions (3D) only develops near the critical point for specific
strong-disorder strengths, multifractality in 2D systems is expected to be
observable even for weak disorder. Here we provide evidence for multifractal
features in the superconducting state of an intrinsic weakly disordered
single-layer NbSe by means of low-temperature scanning tunneling
microscopy/spectroscopy. The superconducting gap, characterized by its width,
depth and coherence peaks' amplitude, shows a characteristic spatial modulation
coincident with the periodicity of the quasiparticle interference pattern.
Spatial inhomogeneity of the superconducting gap width, proportional to the
local order parameter in the weak-disorder regime, follows a log-normal
statistical distribution as well as a power-law decay of the two-point
correlation function, in agreement with our theoretical model. Furthermore, the
experimental singularity spectrum f() shows anomalous scaling behavior
typical from 2D weakly disordered systems
Whole Genome Analysis of the Red-Crowned Crane Provides Insight into Avian Longevity
The red-crowned crane (Grus japonensis) is an endangered, large-bodied crane native to East Asia. It is a traditional symbol of longevity and its long lifespan has been confirmed both in captivity and in the wild. Lifespan in birds is known to be positively correlated with body size and negatively correlated with metabolic rate, though the genetic mechanisms for the red-crowned crane's long lifespan have not previously been investigated. Using whole genome sequencing and comparative evolutionary analyses against the grey-crowned crane and other avian genomes, including the long-lived common ostrich, we identified red-crowned crane candidate genes with known associations with longevity. Among these are positively selected genes in metabolism and immunity pathways (NDUFA5, NDUFA8, NUDT12, SOD3, CTH, RPA1, PHAX, HNMT, HS2ST1, PPCDC, PSTK CD8B, GP9, IL-9R, and PTPRC). Our analyses provide genetic evidence for low metabolic rate and longevity, accompanied by possible convergent adaptation signatures among distantly related large and long-lived birds. Finally, we identified low genetic diversity in the red-crowned crane, consistent with its listing as an endangered species, and this genome should provide a useful genetic resource for future conservation studies of this rare and iconic species
Recycling and Reuse of Waste Batteries from Electric Vehicles: A review
As sales of electric vehicles rapidly increase, the amount of waste batteries is also rapidly increasing. Accordingly, social interest in the recycling and reuse of waste batteries is rapidly increasing. Waste battery recycling refers to the process of reprocessing waste batteries and extracting valuable water for reuse. Reuse of waste batteries refers to the process of using them again for the same purpose after undergoing a slight conversion process. Currently, related technology development is required, and related policies are insufficient. Looking at the global trend, a waste battery collection system is being established through the labeling system and producer responsibility recycling system, battery performance and safety evaluation standards are being established, and efficient and safe transportation systems are being established. Since it is not clear who is responsible for each stage of the problem in the disposal of waste batteries, a history management system is needed. It is important to efficiently extract and recycle waste battery resources, but it is also necessary to develop battery technology free from resource scarcity. In this review, recycling and reuse-related technologies of waste batteries, battery-related policies, and rare metal replacement technologies were explored, and directions for future waste battery policies were presented
- …