Particle Survival and Polydispersity in Aggregation

We study the probability, $P_S(t)$, of a cluster to remain intact in one-dimensional cluster-cluster aggregation when the cluster diffusion coefficient scales with size as $D(s) \sim s^\gamma$. $P_S(t)$ exhibits a stretched exponential decay for $\gamma < 0$ and the power-laws $t^{-3/2}$ for $\gamma=0$, and $t^{-2/(2-\gamma)}$ for $0<\gamma<2$. A random walk picture explains the discontinuous and non-monotonic behavior of the exponent. The decay of $P_S(t)$ determines the polydispersity exponent, $\tau$, which describes the size distribution for small clusters. Surprisingly, $\tau(\gamma)$ is a constant $\tau = 0$ for $0<\gamma<2$.Comment: submitted to Europhysics Letter

Fisheries local action groups, small-scale fisheries and territorial development

\ua9 2024 The Authors. Sociologia Ruralis published by John Wiley &amp; Sons Ltd on behalf of European Society for Rural Sociology. In comparison to the wealth of critical evaluation of LEADER (i.e., Liaison entre actions de d\ue9veloppement de l\u27\ue9conomie rurale), there has been no consolidated attempt to reflect on the contribution of Fisheries Local Action Groups (FLAGs), now entering their third EU programming period. Set up in the image of LEADER, and a novel governance instrument within the Common Fisheries Policy (CFP), FLAGs aim to activate local responses that build resilience and adaptability within the fisheries sector and wider communities. In addition to introducing the accompanying articles that make up this special issue of Sociologia Ruralis, our article gives an account of the emergence of community-led local development (CLLD) in fisheries and the attributes that have characterised the application of the LEADER approach within a fisheries-territorial development context. In many cases, FLAGs have led to improved relationships between the small-scale fishing sector and wider local social and economic networks, helping the sector reimagine its role within local economies. Yet outcomes vary as the FLAG approach has been applied across different cultural and institutional settings. There are indications that the system is becoming enveloped by wider priorities of coastal development and blue growth. Yet FLAGs may well provide a successful test case for widening participation in the CFP and upscaling integration of the fishing industry within local and regional economies. For CLLD in general, they are a reminder of the value of a differentiated CLLD approach tailored to different sectoral-territorial contexts

Finite element modeling of multi-pass welding and shaped metal deposition processes

This paper describes the formulation adopted for the numerical simulation of the shaped metal deposition process (SMD) and the experimental work carried out at ITP Industry to calibrate and validate the proposed model. The SMD process is a novel manufacturing technology, similar to the multi-pass welding used for building features such as lugs and flanges on fabricated components (see Fig.&nbsp;1a and b). A fully coupled thermo-mechanical solution is adopted including phase-change phenomena defined in terms of both latent heat release and shrinkage effects. Temperature evolution as well as residual stresses and distortions, due to the successive welding layers deposited, are accurately simulated coupling the heat transfer and the mechanical analysis. The material behavior is characterized by a thermo-elasto-viscoplastic constitutive model coupled with a metallurgical model. Nickel super-alloy 718 is the target material of this work. Both heat convection and heat radiation models are introduced to dissipate heat through the boundaries of the component. An in-house coupled FE software is used to deal with the numerical simulation and an ad-hoc activation methodology is formulated to simulate the deposition of the different layers of filler material. Difficulties and simplifying hypotheses are discussed. Thermo-mechanical results are presented in terms of both temperature evolution and distortions, and compared with the experimental data obtained at the SMD laboratory of ITP

Sourcing from Africa: A Systematic Review and a Research Agenda

Finnish Foundation for Economic Educatio

Integration of African firms into global value chains

Ever since the emergence of the global sourcing and manufacturing phenomenon, numerous firms have expanded their sourcing and manufacturing efforts to low-cost countries to increase their competitive advantage. However, as costs are drastically rising in previously cost-efficient countries, firms in both low-cost and high-cost countries are experiencing continental shifts in global sourcing and manufacturing patterns. On the one hand, firms from developed economies are gradually leaving previously cost-efficient sourcing destinations, such as China, to search for suppliers in alternative low-cost locations, such as the African continent, or reshoring to their home countries. On the other hand, firms from relatively low-cost economies, such as China, are also increasingly starting to source from other destinations, such as the African continent, and offshore their manufacturing activities to high-cost environments.  To facilitate a scientific treatment of the continental shifts in global sourcing and manufacturing, this dissertation focuses on the topic from the perspectives of China and Africa. Specifically, this dissertation investigates the challenges faced by Chinese manufacturing suppliers, and their responses, in supplying to global buyers, and the factors motivating Chinese firms to offshore their manufacturing to high-cost environments. Additionally, this dissertation takes a deeper look into the gaps in extant literature on sourcing from Africa and suggests future research avenues. Finally, yet importantly, this dissertation identifies the roles of African suppliers in global value chains as well as the motives of firms from both developed and developing economies in sourcing from Africa and the common obstacles met.  The overall findings of this dissertation reveal that the roles of Chinese and African firms have changed in global value chains, with China moving up the value ladder and Africa becoming more integrated. The findings also indicate that there are no overarching "etic" theories (i.e. general theories which everyone can transpose and adapt for their specific conditions, as opposed to "emic" theories which are contextual and suitable only for specific situations (Revilla and Sáenz, 2014)) in the purchasing and supply management discipline that can be applied regardless of national and cultural contexts, as it has been found that extant knowledge of theories and frameworks on global sourcing and manufacturing cannot necessarily be applied in the Chinese and African contexts

Data-driven comorbidity analysis of 100 common disorders reveals patient subgroups with differing mortality risks and laboratory correlates

The populational heterogeneity of a disease, in part due to comorbidity, poses several complexities. Individual comorbidity profiles, on the other hand, contain useful information to refine phenotyping, prognostication, and risk assessment, and they provide clues to underlying biology. Nevertheless, the spectrum and the implications of the diagnosis profiles remain largely uncharted. Here we mapped comorbidity patterns in 100 common diseases using 4-year retrospective data from 526,779 patients and developed an online tool to visualize the results. Our analysis exposed disease-specific patient subgroups with distinctive diagnosis patterns, survival functions, and laboratory correlates. Computational modeling and real-world data shed light on the structure, variation, and relevance of populational comorbidity patterns, paving the way for improved diagnostics, risk assessment, and individualization of care. Variation in outcomes and biological correlates of a disease emphasizes the importance of evaluating the generalizability of current treatment strategies, as well as considering the limitations that selective inclusion criteria pose on clinical trials.Peer reviewe

What\u27s going well: a qualitative analysis of positive patient and family feedback in the context of the diagnostic process

OBJECTIVES: Accurate and timely diagnosis relies on close collaboration between patients/families and clinicians. Just as patients have unique insights into diagnostic breakdowns, positive patient feedback may also generate broader perspectives on what constitutes a good diagnostic process (DxP). METHODS: We evaluated patient/family feedback on what\u27s going well as part of an online pre-visit survey designed to engage patients/families in the DxP. Patients/families living with chronic conditions with visits in three urban pediatric subspecialty clinics (site 1) and one rural adult primary care clinic (site 2) were invited to complete the survey between December 2020 and March 2022. We adapted the Healthcare Complaints Analysis Tool (HCAT) to conduct a qualitative analysis on a subset of patient/family responses with ≥20 words. RESULTS: In total, 7,075 surveys were completed before 18,129 visits (39 %) at site 1, and 460 surveys were completed prior to 706 (65 %) visits at site 2. Of all participants, 1,578 volunteered positive feedback, ranging from 1-79 words. Qualitative analysis of 272 comments with ≥20 words described: Relationships (60 %), Clinical Care (36 %), and Environment (4 %). Compared to primary care, subspecialty comments showed the same overall rankings. Within Relationships, patients/families most commonly noted: thorough and competent attention (46 %), clear communication and listening (41 %) and emotional support and human connection (39 %). Within Clinical Care, patients highlighted: timeliness (31 %), effective clinical management (30 %), and coordination of care (25 %). CONCLUSIONS: Patients/families valued relationships with clinicians above all else in the DxP, emphasizing the importance of supporting clinicians to nurture effective relationships and relationship-centered care in the DxP

Effect of toroidal field ripple on plasma rotation in JET

Dedicated experiments on TF ripple effects on the performance of tokamak plasmas have been carried out at JET. The TF ripple was found to have a profound effect on the plasma rotation. The central Mach number, M, defined as the ratio of the rotation velocity and the thermal velocity, was found to drop as a function of TF ripple amplitude (3) from an average value of M = 0.40-0.55 for operations at the standard JET ripple of 6 = 0.08% to M = 0.25-0.40 for 6 = 0.5% and M = 0.1-0.3 for delta = 1%. TF ripple effects should be considered when estimating the plasma rotation in ITER. With standard co-current injection of neutral beam injection (NBI), plasmas were found to rotate in the co-current direction. However, for higher TF ripple amplitudes (delta similar to 1%) an area of counter rotation developed at the edge of the plasma, while the core kept its co-rotation. The edge counter rotation was found to depend, besides on the TF ripple amplitude, on the edge temperature. The observed reduction of toroidal plasma rotation with increasing TF ripple could partly be explained by TF ripple induced losses of energetic ions, injected by NBI. However, the calculated torque due to these losses was insufficient to explain the observed counter rotation and its scaling with edge parameters. It is suggested that additional TF ripple induced losses of thermal ions contribute to this effect