Miracle-dz/UniFAR-FTUs huggingface dataset:
A review of modelling techniques for floating offshore wind turbines

Modelling floating offshore wind turbines (FOWTs) is challenging due to the strong coupling between the aerodynamics of the turbine and the hydrodynamics of the floating platform. Physical testing at scale is faced with the additional challenge of the scaling mismatch between Froude number and Reynolds number due to working in the two fluid domains, air and water. In the drive for cost-reduction of floating wind energy, designers may be seeking to move towards high-fidelity numerical modelling as a substitute for physical testing. However, the numerical engineering tools typically used for FOWT modelling are considered as mid-fidelity to low-fidelity tools, and currently lack the level of accuracy required to do so. Furthermore, there is a lack of operational FOWT data available for further development and validation. High-fidelity tools, such as CFD, have greater accuracy but are cumbersome tools and still require validation. Physical scale model testing therefore continues to play an essential role in the development of FOWTs both as a source of validation data for numerical models and as an important development step along the path to commercialization of all platform concepts. The aim of this paper is to provide an overview of both numerical modelling and physical FOWT scale model testing approaches and to provide guidance on the selection of the most appropriate approach (or combination of approaches). The current state-of-the-art will be discussed along with current research trends and areas for further investigation.
Vibro-Impact Experiments and Computations of a Gap-Supported Tube Subjected to Single-Phase Fluid-Elastic Coupling Forces

In this paper we address the problem of computing the nonlinear vibro-impact responses of gap-supported heat-exchanger tubes subjected to fluid-elastic coupling forces, as well as to the turbulence excitation from transverse flows. Emphasis is on the fluid-elastic modeling within a time-domain nonlinear framework, as well as on the stabilizing effect of impacts on the fluid-elastic coupling forces. Theoretical computations of the linear and vibro-impacting regimes of a flow-excited cantilever test tube, within a rigid 3×5 square bundle, are based on the experimentally identified fluid-elastic coupling force coefficients and turbulence spectrum. Computations are then compared with the experimental vibratory responses, enabling a full validation of the modeling approach. Furthermore, interesting conclusions are drawn, concerning: (a) the energy balance between sources and sinks, for a vibro-impacting tube subjected to fluid-elastic forces; (b) the dependence of the vibration response frequency on impacts at the loose supports, and their effect on the nonlinear re-stabilization of fluid-elastically unstable tubes. Details on the following aspects are reported in the paper: (1) Numerical modeling of the fluid-elastic coupling forces for time-domain computations; (2) Experimental identification of the fluid-elastic coupling coefficients; (3) Computations and experiments of both linear and vibro-impacting responses under the combined action of turbulence and fluid-elastic coupling; and (4) Energy aspects of the vibro-impacting fluid-elastically coupled tube responses.Copyright © 2010 by ASME
Heterosis Performance of Seed Cotton Yield and Physiological Parameters in F 1 Inter Specific Hybrids in Cotton

In order to known better the heterosis performance, yield and physiological parameters in 112 hybrids (F 1 ) and their parents the study initiated to create recombinational variability for combining ability, the elite barbadense lines DB 533 and DB 534 were crossed during 2007~2008. During two seasons 2008~2009 and 2009~2010 these barbadense crosses were advanced to F 2 and F 3 generations, respectively. The F 3 lines were evaluated for productivity and fiber quality parameters realizing the emphasis laid on developing ELS (Extra Long Stable) cotton hybrids out of 171 F 3 lines, only those F 3 lines with acceptable fiber strength were utilized in the study on recombinational variability of combining ability. During 2010~2011 those twenty eight F 4 lines of barbadense cross DB 533 × DB 534 depending on the higher value of fiber tenacity, were crossed with the selected four hirsutum testers viz., DH 98-27 (T 1 ), ZCH 8 (T 2 ), 178-24 (T 3 ) and DH 18-31 (T 4 ) selected based on earlier study. The derived F 1 crosses (28 barbadense lines x 4 hirsutum testers) were compared with the bench mark crosses (two barbadense lines x 4 hirsutum testers) of the heterotic box, best Bt check hybrid (MRC 6918) and non Bt check (DCH 32). Many derived F 1 crosses were found to be more productive than non Bt check DCH 32 (48 hybrids) and the Bt check MRC 6918 (35 hybrids). The potential crosses like DH 98-27 X (DB 533 x DB 534 F 4 IPS 49), DH 98-27 X (DB 534 x DB 533 F 4 IPS 22) and DH 98-27 X (DB 533 x DB 534 F 4 IPS 52) recorded highest per se performance for seed cotton yield. These potential crosses recorded highly significant heterosis over mid parent for seed cotton yield. They also recorded significant heterosis for other physiological parameters. Apart from showing high productivity the potential cross DH 98-27 X (DB 533 x DB 534 F 4 IPS 49 showed higher value of photosynthetic rate and stomatal conductance. This potential cross is example for blending of yield characters and physiological parameters.
Experience, Knowledge, and Political Representation

Abstract Evidence suggests that increasing the descriptive representation of groups improves their substantive representation. What underpins this link? Many scholars writing on the subject stop short of arguing explicitly that it is “shared experience” within groups. I argue that we should embrace the potential conceptual and empirical benefits of framing representation through experience. To do this, we should think of experience specifically in terms of the epistemic content and capacities gained through subjective experience, which can allow individuals to think about the world in distinct ways. I reframe the idea that experiences might be shared within groups and ameliorate concerns that the concept is essentialist, drawing out the political relevance of my argument. This has the strategic implication that we should be unafraid to argue in favor of political presence on the basis of (shared) experience and the empirical implication that future research should consider subjective experience more closely.
Selection of Lactic Acid Bacteria with In Vitro Probiotic-Related Characteristics from the Cactus Pilosocereus gounellei (A. Weber ex. K. Schum.) Bly. ex Rowl

Pilosocereus gounellei (A. Weber ex. K. Schum.) Bly. ex Rowl. , popularly known as xique-xique, is a cactus from the Caatinga biome, which is rich in bioactive compounds but has not been previously studied as a source of lactic acid bacteria (LAB) with probiotic aptitudes. This study aimed to identify, characterize, and select LAB isolates with in vitro probiotic-related characteristics from xique-xique cladodes and fruit. Isolates with the most promising probiotic-related characteristics were evaluated regarding their in vitro technological properties and capability of surviving in chestnut milk, whey protein drink, and mate tea with mint during 21 days of refrigeration storage. Seventeen recovered isolates had typical characteristics of LAB. Six out of these seventeen LAB isolates passed the safety tests and were included in experiments to evaluate the in vitro probiotic-related characteristics. Based on the results of a principal component analysis, the isolates 69, 82, 98, and 108 had the best performances in experiments to evaluate the probiotic-related characteristics. In addition to showing good technological properties, the four selected LAB isolates had high viable counts (>7.3 log cfu/mL) and high sizes of physiologically active cell subpopulations in chestnut milk, whey protein drink, and mate tea during refrigeration storage. These four isolates were identified by 16S-rRNA sequencing as being Lacticaseibacillus paracasei or Lacticaseibacillus casei. The results indicate xique-xique as a source of potentially probiotic LAB isolates.
Intermittent model predictive control

Abstract Intermittent control, where a sequence of open-loop trajectories is punctuated by intermittent feedback, is described, and a number of design methods are presented. A generalized hold representation is derived and shown to be useful for both implementation and analysis. The relationship between predictive control of a time delay system and intermittent control is examined, and it is shown that a simplified predictor can be used in the latter case. The applicability of intermittent control to the implementation of model-based predictive control (MPC) is discussed and illustrated by the control of a difficult mechanical system - a self-balancing seesaw.
Changes in production control required for untended operation of a flexible manufacturing cell

This article examines and improves the production control system of a firm that wants to operate its flexible manufacturing cell (FMC) in an untended third shift. The FMC consists of a machining centre, a pallet storage, a rail-guided transport vehicle for pallets and a clamping/unclamping station. The current production control system of the firm shows several deficiencies with respect to operating the FMC efficiently. This article proposes changes in the current production control hierarchy and introduces some new methods to solve major production control problems. The study illustrates the interaction between quantitative tools, organisational decisions and behavioural considerations. The approaches are general and can be used in other environments.
Diffusing capacity in chronic obstructive pulmonary disease assessment: A meta-analysis

To achieve a multidimensional evaluation of chronic obstructive pulmonary disease (COPD) patients, the spirometry measures are supplemented by assessment of symptoms, risk of exacerbations, and CT imaging. However, the measurement of diffusing capacity of the lung for carbon monoxide (DLCO) is not included in most common used models of COPD assessment. Here, we conducted a meta-analysis to evaluate the role of DLCO in COPD assessment. The studies were identified by searching the terms “diffusing capacity” OR “diffusing capacity for carbon monoxide” or “DLCO” AND “COPD” AND “assessment” in Pubmed, Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, Embase, Scopus, and Web of Science databases. The mean difference of DLCO % predict was assessed in COPD patient with different severity (according to GOLD stage and GOLD group), between COPD patients with or without with frequent exacerbation, between survivors and non-survivors, between emphysema dominant and non-emphysema dominant COPD patients, and between COPD patients with or without pulmonary hypertension. 43 studies were included in the meta-analysis. DLCO % predicted was significantly lower in COPD patients with more severe airflow limitation (stage II/IV), more symptoms (group B/D), and high exacerbation risk (group C/D). Lower DLCO % predicted was also found in exacerbation patients and non-survivors. Low DLCO % predicted was related to emphysema dominant phenotype, and COPD patients with PH. The current meta-analysis suggested that DLCO % predicted might be an important measurement for COPD patients in terms of severity, exacerbation risk, mortality, emphysema domination, and presence of pulmonary hypertension. As diffusion capacity reflects pulmonary ventilation and perfusion at the same time, the predictive value of DLCO or DLCO combined with other criteria worth further exploration.
Retrospective analysis of the effects of non-communicable diseases on periodontitis treatment outcomes

Purpose We retrospectively analysed patients’ dental and periodontal status according to the presence of non-communicable diseases (NCDs) and the effects of NCDs on periodontal treatment outcomes. Factors influencing disease recurrence were investigated using decision tree analysis. Methods We analysed the records of patients who visited the Department of Periodontology, Pusan National University Dental Hospital from June 2014 to October 2019. As baseline subjects, 1,362 patients with periodontitis and who underwent full-mouth periodontal examinations before periodontal treatment were selected. Among them, 321 patients who underwent periodontal examinations after the completion of periodontal treatment and 143 who continued to participate in regular maintenance were followed-up. Results Forty-three percent of patients had a NCD. Patients without NCDs had more residual teeth and lower sum of the number of total decayed, missing, filled teeths (DMFT) scores. There was no difference in periodontal status according to NCD status. Patients with a NCD showed significant changes in the plaque index after periodontal treatment. The decision tree model analysis demonstrated that osteoporosis affected the recurrence of periodontitis. Conclusions The number of residual teeth and DMFT index differed according to the presence of NCDs. Patients with osteoporosis require particular attention to prevent periodontitis recurrence.
Behavioural and emotional symptoms among schoolchildren: a comparison between Jordanians and Syrian refugees.

Background There is a high prevalence of mental illnesses, including depression, anxiety, nicotine dependence, and sleep disorders among Jordanian adolescents and schoolchildren. There are many young Syrian refugees in Jordan, who have an increased risk of physical and psychological illnesses. Aims To assess the behavioural and emotional symptoms among Syrian schoolchildren refugees in Jordan and their Jordanian counterparts. Methods A cross-sectional, descriptive study was conducted from October to December 2018 on Syrian and Jordanian schoolchildren, aged 12-17 years, attending the same schools in 4 cities with the highest density of Syrian refugees. A self-reported questionnaire was used to collect information about sociodemographic characteristics. The Strengths and Difficulties Questionnaire was used to measure behavioural and emotional symptoms. Results This study included 1877 Jordanian schoolchildren and 1768 Syrian schoolchildren refugees. The Syrian children's parents were significantly less educated and had significantly lower incomes and larger families than Jordanian parents had. The total difficulties and peer relationship problems were abnormally high in more than half of children. Compared to Jordanians, Syrian schoolchildren had more total difficulties (58.2% vs 52.5%), and peer relationship (55.5 vs 53.6%), conduct (47.6% vs 44.8%), and emotional problems (32.0% vs 30.8%), but they had fewer hyperactivity/inattention problems (35.5% vs 36.9%), and prosocial behaviour problems (42.5% vs 43.0%). In binary logistic regression, Syrian were more likely than Jordanian schoolchildren to experience overall difficulties and emotional symptoms. Conclusion There were significant but unspoken behavioural and emotional symptoms and mental health needs among Syrian and Jordanian schoolchildren. They are all in need of urgent psychosocial support.
Effect of Spinning Triangle and Production Speed of Hollow-Spindle System on the Bouclé Yarn Structure

This study aims to show the impact of both the width of the base of the spinning triangle and the production speeds of hollow-spindle spinning machines on the structure of ultimate multiple-thread-structure bouclé yarns and similar fancy yarns. A hollow-spindle spinning machine was used and bouclé yarns were made of a core thread, an effect thread and a (multifilament) binder. Initially, five bouclé yarns were made by setting the widths of the base of the spinning triangle at five levels, i.e. 4.5 mm, 7.5 mm, 10 mm, 13 mm and 16 mm. A further six bouclé yarns were made to show the changes that occur to the spinning triangle at various production speeds. The resulting fancy bouclé yarns were assessed by measuring the size, number and circularity ratio of bouclé profiles. It was found that at low production speeds, i.e. at start-up, that the spinning triangle was unstable, which adversely affected the structure of the final bouclé yarns. However, at production speeds higher than 17 m/min, the spinning triangle became stable, though such a stable spinning triangle had no impact on the structure of the resulting fancy bouclé yarns. The results of this study may help fancy yarn manufacturers to avoid making defective fancy yarns.
Does mindfulness reduce negative interpretation bias?

ABSTRACT Negative interpretation bias, or the tendency to interpret ambiguous life events in a negative manner rather than positive or neutral, is a precursor to depression and anxiety. Evidence suggests that mindfulness reduces depression and anxiety, as well as a number of different negative cognitive biases. However, little is known about the association between mindfulness and negative interpretation bias specifically. Across two cross-sectional studies, we investigated this relation. In Study 1 (N = 135), greater trait mindfulness was correlated with less negative interpretation bias. In Study 2 (N = 173), we experimentally tested whether a brief mindfulness induction, compared to a mind-wandering task, decreased negative interpretation bias. Although there was not a direct effect of condition (mindfulness vs. mind-wandering) on negative interpretation bias, there was a significant indirect effect through negative mood. That is, participants in the mind-wandering condition reported greater negative mood following the induction compared to participants in the mindfulness condition, which was associated with more negative interpretation bias. The results suggest mindfulness is associated with less negative interpretation bias and may reduce negative interpretation bias by decreasing negative mood.
A low frequency nonlinear energy harvester with large bandwidth utilizing magnet levitation

The application of vibration based energy harvesting in civil infrastructures usually has to resolve two major problems, namely, the low excitation frequency and large frequency range. To this end, a nonlinear energy harvester utilizing magnet levitation is proposed in this study. The proposed harvester can convert low frequency excitations into high frequency ones in its four doubly clamped piezoelectric beams through multi-impact. A large bandwidth is expected due to the stiffness nonlinearity introduced by using magnet levitation. A theoretical model is first developed for the harvester. Then, sinusoidal vibrations and simulated bridge vibrations are used as the external excitations to verify the performance of the harvester. The simulation results show an improved robustness of the harvester under low frequency vibrations, which indicates the proposed harvester is an ideal device for energy harvesting in civil infrastructures.
The calculation of inrush current in three-phase transformers

The inrush current associated with energising power transformers can cause interference and damage to other system components. The paper sets out to describe an accurate analytical method which can be used to find the inrush current in any 3-phase transformer in common use. The method is an extension of one previously described to calculate inrush in single-phase transformers. The method is powerful in that the current and its decay can be calculated over many cycles, not just the first peak, as has been possible by other methods. A comparison is made between different transformer connections and illustrated by numerical examples. These show, for example, that resistance in the neutral of a star connected transformer has little effect compared to using the same resistance in series with the energised windings.
Integrated Simulation, Analysis and Testing of a Variable Valve Train for Passenger Car Diesel Engines

The need to meet ever more stringent emission legislations over the last decade has led to a significant increase in diesel engine complexity. A typical modern passenger car diesel engine now features variable geometry exhaust gas turbocharging and variable charge motion in combination with exhaust gas recirculation. Further improvements are still required and one technology that has the potential to improve fuel economy and reduce emissions is variable valve timing. This gives the ability to alter in-cylinder charge motion and effective compression ratio. In doing so, it not only alters in-cylinder pressures and temperatures, but also the operating point of the turbocharger and EGR system. This paper demonstrates how both 1-D and 3-D numerical simulation have been used in conjunction with engine testing to analyse the fundamental effects and separate the interactions. Using an asymmetric valve timing technology to enable both early and late intake valve closing, the effects and benefits of various operating strategies are discussed. The numerical simulations provide a fundamental insight in the governing behaviour of the engine and allow the initial design to be optimised. Engine testing and combustion analysis are used to demonstrate the effects of variable valve timing on the engine and explain how improvements in emissions and fuel economy can be achieved.
Repeated genetic adaptation to high altitude in two tropical butterflies

Repeated evolution can provide insight into the mechanisms that facilitate adaptation to novel or changing environments. Here we study adaptation to high altitude in two divergent tropical butterflies, H. erato and H. melpomene, which have repeatedly and independently adapted to high elevations on either side of the Andean mountains. We sequenced 518 whole genomes from elevational transects and found many regions under selection at high altitude, with repeated genetic differentiation across multiple replicates, including allopatric comparisons. In contrast, there is little ‘molecular parallelism’ between H. erato and H. melpomene. With a further 85 whole genomes of five close relatives, we find that a large proportion divergent regions have arisen from standing variation and putative adaptive introgression from high-altitude specialist species. Taken together our study supports a key role of standing genetic variation and gene flow from pre-adapted species in promoting parallel genetic local adaptation to the environment.