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Description of the \\ _c\\ and \\ _b\\ states as molecular states
In this work we study several \\[ _c\\] and \\[ _b\\] states dynamically generated from the meson–baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe–Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed \\[ _c\\] states, including the \\[ _c(2790)\\], \\[ _c(2930)\\], \\[ _c(2970)\\], \\[ _c(3055)\\] and \\[ _c(3080)\\]. Also, for the recently reported \\[ _b(6227)\\] state, we find two poles with masses and widths remarkably close to the experimental data, for both the \\[J^P=1/2^-\\] and \\[J^P=3/2^-\\] sectors.
Journal Article
The endless steppe : growing up in Siberia
During World War II, when she was eleven years old, the author and her family were arrested in Poland by the Russians as political enemies and exiled to Siberia. She recounts here the trials of the following five years spent on the harsh Asian steppe.
Book
Microtubule minus-end regulation at spindle poles by an ASPM–katanin complex
ASPM (known as Asp in fly and ASPM-1 in worm) is a microcephaly-associated protein family that regulates spindle architecture, but the underlying mechanism is poorly understood. Here, we show that ASPM forms a complex with another protein linked to microcephaly, the microtubule-severing ATPase katanin. ASPM and katanin localize to spindle poles in a mutually dependent manner and regulate spindle flux. X-ray crystallography revealed that the heterodimer formed by the N- and C-terminal domains of the katanin subunits p60 and p80, respectively, binds conserved motifs in ASPM. Reconstitution experiments demonstrated that ASPM autonomously tracks growing microtubule minus ends and inhibits their growth, while katanin decorates and bends both ends of dynamic microtubules and potentiates the minus-end blocking activity of ASPM. ASPM also binds along microtubules, recruits katanin and promotes katanin-mediated severing of dynamic microtubules. We propose that the ASPM–katanin complex controls microtubule disassembly at spindle poles and that misregulation of this process can lead to microcephaly.
Jiang
et al.
show that the microcephaly-associated protein ASPM and katanin form a complex that binds microtubule minus ends and can sever microtubules and block microtubule minus-end elongation to control spindle pole dynamics.
Journal Article
Impacts of Strengthened Antarctic Circumpolar Current on the Seasonality of Arctic Climate
To understand the role of the Antarctic Circumpolar Current (ACC) in the polar seasonality and its remote effect on the Arctic climate, we use the Community Earth System Model to perform Drake Passage (DP) open and closed experiments. Model results illustrate that in the opened DP, the ACC and Atlantic Meridional Overturning Circulation (AMOC) strengthen, leading to a colder Antarctic and a warmer Arctic. Notably, the temperature changes in both the Antarctic and the Arctic show significant seasonal differences, with the largest polar response during the cold seasons. Around the Antarctic, both the ACC and overturning circulation exhibit stronger acceleration in winter than in summer, causing more pronounced cooling in winter. Furthermore, negative seasonal energy transfer mechanism amplifies this cooling. In contrast, around the Arctic, the AMOC and ocean heat transport show relatively insignificant seasonal variation. Instead, it is the downward latent and sensible fluxes that induce amplified winter warming. Plain Language Summary The Antarctic Circumpolar Current (ACC), as the most important ocean current in the Southern Ocean, has crucial influences on global ocean circulations and climate changes. To better comprehend the regional and remote roles of ACC in the current climate system, we close the Southern Ocean gateway, the Drake Passage (DP) in the fully coupled climate model to cut off the ACC and slow down this ocean circulation. Defining the climate response as the changes from closed DP to opened DP experiments, we find that the ACC strengthens as the DP is open. Our findings highlight a significant impact of the ACC on the current climate system, particularly on driving seasonal variations. The results also have further implications for the remote influence of the ACC on the Arctic climate through global oceanic circulation connections and local sea‐ice‐atmosphere interactions. Key Points A strengthened Antarctic Circumpolar Current results in a colder Antarctic but a warmer Arctic The temperature responses at both poles are amplified by the air‐sea‐ice coupling during cold seasons The pole‐to‐pole linkage via atmospheric pathway acts to compensate for the changes driven by oceanic pathways
Journal Article
An industrial integration framework based on QFD for selecting the optimal electrical poles
Utility poles are critical in supporting various electrical and communication infrastructure systems, including power transmission lines, streetlights, telephone networks, and cable services. Each type of pole whether steel, aluminum, or fiber-reinforced polymer (FRP) is designed with specific applications and performance characteristics in mind. This study presents a Quality Function Deployment (QFD) framework tailored for industrial applications, focusing on enhancing information integration to guide the selection of the most suitable pole type. The research examines advancements in utility pole technologies and management practices over the past two decades. Through market surveys, focus group discussions and individual interviews, ten KPIs were identified: service life, safety performance, overall cost, color retention, conductivity resistance, weight, production duration, transportability, installation approach, and wind resistance. Based on these KPIs, decision-makers outlined nine functional requirements that, when met, would enhance user satisfaction. The proposed framework was developed to support analytical evaluation and selection of the optimal pole type by aligning client needs with technical specifications. Using the QFD approach, the FRP pole emerged as the top-performing alternative, receiving a score of 4.12 out of 5. This framework provides a structured method for decision-makers to evaluate electrical pole options based on project-specific criteria, enabling informed and client-focused choices in early design phases.
Journal Article
FRP Poles: A State-of-the-Art-Review of Manufacturing, Testing, and Modeling
Fiber-reinforced polymers poles were on the increase because they were lightweight, have high strength-to-weight ratios, provide corrosion resistance, can be customized to meet strength and deflection requirements, and have a low life-cycle cost of construction and maintenance. This research presents a comprehensive review of all significant research and existing case studies to review the present knowledge concerning fiber-reinforced polymers poles. The main summary covers 70 works focusing on fiber poles to summarize recent activities on selected relevant topics and highlight possible future implementations. In this context, this study discusses fiber-reinforced polymers poles in six aspects: (i) introduction; (ii) methodology; (iii) Materials properties of FRP poles; (iv) manufacturing techniques of FRP poles; (v) testing of FRP poles (static and dynamic flexure test as cantilever beam); (vi) modeling of FRP poles. Therefore, this critical review will demonstrate an overview of FRP Poles manufacturing techniques (Pultrusion, filament winding, centrifugal process, and hand lay-up) and which Pultrusion technique is the best suited for FRP Poles. Static modeling was the most used of other techniques.
Journal Article
Where to start? Development of a spatial tool to prioritise retrofitting of power line poles that are dangerous to raptors
1. Avian electrocution on power lines is a major conservation issue on a global scale. Electrocution risk models have recently been proposed as an effective alternative to prioritising high-risk pole retrofitting activities at a large scale. However, existing models ignore the specific features of the power poles (hereafter, poles) supporting the power distribution lines and make the tenuous assumption that pole density and power line length are key factors to assessing the electrocution risk at a large scale. This assumption may be violated in areas with high variations in pole configuration. 2. In this study, we used data on raptors electrocuted on poles to develop a predictive model of raptor electrocution risk throughout an extensive geographical area in north-western Spain, using boosted regression trees. With the best-fitting model, we predicted the hazard of a set of 188,741 poles and validated the model predictions with new data collected from the study area. 3. Our model highlights the relevance of combining both habitat and technical features to identify the most dangerous poles for raptors on a large geographical scale. A 9.86% of the total poles evaluated were characterised as high risk for raptors. The model showed good performance in external validation. The new electrocution events were registered at poles with high-risk values. 4. Synthesis and applications. In this study, we improved the accuracy of the predictive models of raptor electrocution risk for large geographical areas. By incorporating the technical characteristics of the power poles into the models, we achieved a high level of prediction at the power pole level, which is the ultimate correction unit. This will allow electric companies and wildlife managers to specify retrofitting activities of high-risk power poles for raptors in large geographical areas, thus maximising the effect of investment in the correction of dangerous power poles and conservation of the raptor populations.
Journal Article
Analysis of the Formula omitted pentaquark states in the diquark model with QCD sum rules
In this article, we present the scalar-diquark-scalar-diquark-antiquark type and scalar-diquark-axialvector-diquark-antiquark type pentaquark configurations in the diquark model, and study the masses and pole residues of the [Formula omitted] hidden-charm pentaquark states in detail with the QCD sum rules by extending our previous work on the [Formula omitted] and [Formula omitted] hidden-charm pentaquark states. We calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion by constructing both the scalar-diquark-scalar-diquark-antiquark type and the scalar-diquark-axialvector-diquark-antiquark type interpolating currents. The present predictions of the masses can be confronted to the LHCb experimental data in the future.
Journal Article