Sol-Gel Synthesis of Ceria-Zirconia-Based High-Entropy Oxides as High-Promotion Catalysts for the Synthesis of 1,2-Diketones from Aldehyde

Efficient Lewis-acid-catalyzed direct conversion of aldehydes to 1,2-diketones in the liquid phase was enabled by using newly designed and developed ceria–zirconia-based high-entropy oxides (HEOs) as the actual catalysts. The synergistic effect of various cations incorporated in the same oxide structure (framework) was partially responsible for the efficiency of multicationic materials compared to the corresponding single-cation oxide forms. Furthermore, a clear, linear relationship between the Lewis acidity and the catalytic activity of the HEOs was observed. Due to the developed strategy, exclusively diketone-selective, recyclable, versatile heterogeneous catalytic transformation of aldehydes can be realized under mild reaction conditions.

Analysis of Multi-Storied Building with Prestressed Beam using ETABS

Concrete is good in compression and weak in tension and the steel is strong in tension. So the use of reinforced concrete to resist compression and to hold bars in position and to the steel resist tension. In India RCC structures are commonly used in residential as well as business buildings. Nowadays the Post Tensioning method is widely used due to its advantages. Post tensioning is a form of prestressing, that means the steel is stressed before the concrete has to support the service loads. In this paper is exposed to the assessment of execution of Reinforced concrete beam (RCC beam) and Post-Tensioning beam (PT beam) multistoried building structure framework with seismic load using ETABS software. And also evaluate the performance of PT beam under different seismic zone (zone I, zone II) evaluate the performance of PT beam under soil type (medium soil) and compare the performance of RCC deep beam and PT beam with multistory building system with seismic loading performance.

Development And Achievements Of Science, Technology & Innovation Policy In ASEAN Countries: A Comparative Analysis Of Malaysia In Transition Stage With Myanmar, Cambodia And Laos In Developing Stage

ASEAN formally came into being in 1967 and sole purpose of developing this association was to accelerate economic growth, cultural development and social progress. To achieve the vision, ASEAN member nations kept their focus on development and implementing science technology and innovation policy. For this study desktop research was conducted to analyze and compare current scenario of Science technology and innovation policy in Malaysia with Cambodia, Myanmar and Laos. Comparison was done on the basis of structure, framework, barriers and breakthrough in the field of STI policy. It was deduced that Malaysia is currently in its transition phase as compared to Cambodia, Myanmar and Laos, where formulation of an official STI policy documents are still in progress. Some recommendations are proposed so the gap between STI development and implementation is reduced.

Metacommunity analyses show increase in ecological specialisation throughout the Ediacaran

The first animals appear during the late Ediacaran (572 – 541 Ma); an initial diversity increase was followed by a drop, interpreted as catastrophic mass extinction. We investigate the processes underlying these changes using the “Elements of Metacommunity Structure” framework. The oldest metacommunity was characterized by taxa with wide environmental tolerances, and limited specialisation and inter-taxa interactions. Structuring increased in the middle metacommunity, with groups of taxa sharing synchronous responses to environmental gradients, aggregating into distinct communities. This pattern strengthened in the youngest metacommunity, with communities showing strong environmental segregation and depth structure. Thus, metacommunity structure increased in complexity, with increased specialisation and resulting competitive exclusion, not a catastrophic environmental disaster, leading to diversity loss in the terminal Ediacaran, revealing that the complex eco-evolutionary dynamics associated with Cambrian diversification were established in the Ediacaran.

Mechanisms, good and bad

The claim that mechanisms are essential good science is widespread. I argue, however, that these claims are ambiguous in multiple ways. I sort out different version of the mechanism idea: (1) mechanisms that are horizontal – between cause and effect – and mechanisms that are vertical – they realize in lower-level terms causal properties –: and (2) different purposes or uses mechanisms may have. I then focus on the claim that various senses of mechanism are necessary for the confirmation of causal claims. The paper shows that mechanisms can be useful, essential, or harmful depending on context, using the now standard graphical causal structure framework. These conclusions also support the larger philosophy of science moral that methodological norms in science are often context specific and empirical, not a priori and universal.

Women, Fishermen, and Community-Based Tourism at Djoudj Bird National Park, Senegal: An application of the actor-structure livelihood framework

While Community-based tourism (CBT) has delivered on economic opportunities in some cases, researchers have questioned the viability of its impacts, often citing inequitable distribution of benefits as a critical debilitating factor. CBT is often based on normative principles that assume all actors have equal aspirations, power, voice, and access to resources. Yet, tourism activities are embedded in the same uneven social structures that envelope and define local livelihoods. In this qualitative case study of a fishing community outside of Djoudj National Bird Park in Senegal, we analyze the way a CBT project fits within women’s and fishermen’s livelihood strategies, focusing on the social and cultural norms structuring their participation in tourism. We apply the actor-structure livelihood framework to unveil the interactions between the norms embedded in the community-level social structure (i.e. social and cultural norms) and individuals’ agency as they seek out meaningful livelihood opportunities in CBT. The results of our study show that social norms, implicit biases, and cultural identities associated with women and Black Moorish fishermen, normalize their nonparticipation in certain positions within the CBT project. Through this analysis, we highlight norms shaping other livelihood activities and how they spill into the CBT sphere. We situate our findings within the broader scholarly discussion on CBT as a tool that encourages the equitable distribution of benefits and empowerment of local communities. We also discuss livelihood perspectives, specifically actor-structure framework, as a viable approach to explore failures, challenges, and opportunities of tourism as a community development tool.

Real Space Delocalization, Resonance and Aromaticity

<div>When chemists want to explain a molecule’s stability and reactivity, they often refer to the concepts of delocalization, resonance, and aromaticity. Resonance is commonly discussed within the electronic structure framework of valence bond theory as the stabilizing effect of mixing different Lewis structures. Yet, most computational chemists work with delocalized molecular orbitals, which are also usually employed to explain the concept of aromaticity, a special kind of ring delocalization that shows up in cyclic planar systems which abide certain number rules. As an intuitive picture for aromaticity, an electronic ring current has been hypothesized. However, all three concepts lack a real space definition, that is not reliant on orbitals or specific wave function expansions. Here, we outline a redefinition from first principles: the concepts are of kinetic nature and related to saddle points of the all-electron probability density |Ψ|². Delocalization means that likely electron arrangements are connected via paths of high probability density in the many-electron real space. In this picture, resonance is the consideration of additional electron arrangements, which offer alternative paths of higher probability. Most notably, the concept of aromatic ring currents in absence of a magnetic field is rejected and the famous 4n+2 Hückel rule is derived from nothing but the antisymmetry of fermionic wave functions. The analysis developed in this work allows for a quantitative discussion of important chemical concepts that were previously only accessible qualitatively or restricted to specific electronic structure frameworks.</div>