Change Of Coordinates Research Articles

First person – Daniel Lenthall

ABSTRACT First Person is a series of interviews with the first authors of a selection of papers published in Biology Open, helping researchers promote themselves alongside their papers. Daniel Lenthall is first author on ‘ Lower-limb coordination changes following a 6-week training intervention that elicited enhancements to maximum velocity sprint performance’, published in BiO. Daniel is a Master's in Research student at Leeds Beckett University, and strength and conditioning coach in the lab of Mr Andreas Wallbaum at the University of Bath, Bath, UK, investigating research that bridges the gap between theory and practice, making a meaningful impact beyond academia.

University community partnerships for climate change adaptation in Malawi: Exploring contributions, potential opportunities and challenges

Partnerships with local communities have emerged as a prominent educational strategy within university functions, aligning with the ethos of an institution dedicated to community engagement. These partnerships serve not only to empower communities with essential skills to address societal challenges, notably climate change, but also reflect a broader shift in academia towards fostering collaborative relationships with local stakeholders. For students, partnerships offer invaluable hands-on experience by immersing them in direct engagement with community members, bridging the gap between theoretical knowledge and practical application to enrich their educational learning outcomes. This article explores the multifaceted benefits and contributions of partnerships to sustainable community well-being while addressing the inherent complexities that arise when universities engage with communities in promoting human development. Drawing upon qualitative data obtained from interviews with lecturers, students, and community focus groups involved in climate adaptation initiatives, the study investigates the contributions and potential opportunities presented by partnerships and examines challenges encountered by stakeholders in advancing partnerships interventions. Despite the positive impact of partnerships on community skills and empowerment, I argue that while partnerships are contributing towards sustainable community well-being, coordination, funding, and mindset change remain key issues to be addressed. Further, educational practices and pedagogical approaches should prioritize addressing the multidimensionality of climate change and fostering agency and empowerment among community leaders to actively engage in partnership activities. This includes giving them a voice in the choice of adaptation interventions and inclusion of communities' voices in the monitoring and assessment of partnership interventions. By doing so, partnerships can be more effective in promoting sustainable community well-being and improving students' learning outcomes.

Investigation of red-emitting CaMoO4: Eu3+ phosphor by partitioning of substitutional PO4 3- ions via solid-state reaction method.

To investigate the impact of PO4 3- anionic groups, the trivalent europium ion-doped calcium molybdate (CaMoO3-PO4:xEu3+, where x = 0.5, 1.0, 1.5, 2.0, and 2.5mol%) phosphors were synthesized using the solid-state reaction method. The detailed study of the phosphor materials was carried out by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), optical diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The XRD results indicate that the substitution of PO4 3- anion and Eu3+ dopant ion did not affect the crystal structures of the CaMoO4 phosphors. Ultraviolet-visible (UV-vis) absorption analysis revealed the change of absorption edge of both un-doped and Eu3+-doped CaMoO4-PO4 phosphors. Under the 394 nm UV-excitation, the recorded PL spectra showed an intense peak at 615 nm corresponding to the Eu3+: 5D0 → 7F2 transition. The results of the Commission Internationale de l'Eclairage (CIE) diagram reported that the color of the emissions lies in the red color zone and there is no change in the CIE coordinates of the overall emission for Eu3+-doped CaMoO4-PO4 as Eu concentration changes. Thus, these observations led to finding the best red components for white light-emitting diode applications.

Lower-limb coordination changes following a 6-week training intervention that elicited enhancements to maximum velocity sprint performance.

Alterations to intra- and inter-limb coordination with improved maximal velocity performance remain largely unexplored. This study quantified within-day variability in lower-limb segmental coordination profiles during maximal velocity sprinting and investigated the modifications to coordination strategies in 15 recreationally active males following a 6-week period comprised of a multimodal training programme [intervention group (INT); n=7] or continued participation in sports (control group; n=8). The INT demonstrated a large decrease (effect size=-1.54) in within-day coordination profile variability, suggesting potential skill development. Thigh-thigh coordination modifications for the INT were characterised by an earlier onset of trail thigh reversal in early swing (26 versus 28% stride) and lead thigh reversal in late swing (76 versus 79% stride), rather than increases in overall time spent in anti-phase. Moreover, an increase in backward rotation of thigh relative to shank (effect size, 95% CIs: 0.75, 0.17 to 1.33) and shank relative to foot (0.76, -0.17 to 1.68) during late swing likely facilitated more aggressive acceleration of the limb, contributing to reduced touchdown distance and more favourable lower-limb configuration at initial ground contact. These novel findings provide empirical support for the role of longitudinal coordination modifications in improving maximal velocity performance.

Запровадження проєктного підходу як інструменту забезпечення гнучкості та адаптивності підприємств у турбулентному середовищі

Introducing a project approach as a tool for ensuring the flexibility and adaptability of enterprises in a turbulent market environment is necessary for increasing business sustainability. The project approach allows enterprises to adapt to changes faster, reduce risks, and improve management efficiency. The modern market environment is characterized by high levels of uncertainty and turbulent change, necessitating the search for new business management approaches. Traditional management methods, focused on stability, often need to provide the flexibility and adaptability required for enterprises to survive in turbulent conditions. This article substantiates the role of the project-based approach as an effective tool for enhancing organizations’ ability to respond quickly to changes in the external environment, reduce risks, and improve management efficiency. The analysis demonstrates that the project-based approach promotes organizational flexibility, fosters innovation, and optimizes resource allocation — critical factors for the successful operation of enterprises in unstable market conditions. However, implementing this approach is accompanied by challenges, such as resistance to change and difficulties in project coordination. The article also explores various project management models, including hybrid approaches that combine the strengths of traditional and agile methodologies. The conclusions emphasize the need for further research focused on integrating the project-based approach with other management tools and studying the impact of corporate culture on the success of its implementation. The application of various models within the project approach framework allows organizations to respond more effectively to the challenges of the turbulent market, combining stability and predictability with the necessary flexibility and adaptability. Keywords: project, project-based approach, entrepreneurship, adaptability, flexibility, hybrid project models, turbulent environment.

The importance of A-site cation chemistry in superionic halide solid electrolytes

Halide solid electrolytes do not currently display ionic conductivities suitable for high-power all-solid-state batteries. We explore the model system A2ZrCl6 (A = Li, Na, Cu, Ag) to understand the fundamental role that A-site chemistry plays on fast ion transport. Having synthesised the previously unknown Ag2ZrCl6 we reveal high room temperature ionic conductivities in Cu2ZrCl6 and Ag2ZrCl6 of 1 × 10−2 and 4 × 10−3 S cm−1, respectively. We introduce the concept that there are inherent limits to ionic conductivity in solids, where the energy and number of transition states play pivotal roles. Transport that involves multiple coordination changes along the pathway suffer from an intrinsic minimum activation energy. At certain lattice sizes, the energies of different coordinations can become equivalent, leading to lower barriers when a pathway involves a single coordination change. Our models provide a deeper understanding into the optimisation and design criteria for halide superionic conductors.

An Information-Geometric Formulation of Pattern Separation and Evaluation of Existing Indices.

Pattern separation is a computational process by which dissimilar neural patterns are generated from similar input patterns. We present an information-geometric formulation of pattern separation, where a pattern separator is modeled as a family of statistical distributions on a manifold. Such a manifold maps an input (i.e., coordinates) to a probability distribution that generates firing patterns. Pattern separation occurs when small coordinate changes result in large distances between samples from the corresponding distributions. Under this formulation, we implement a two-neuron system whose probability law forms a three-dimensional manifold with mutually orthogonal coordinates representing the neurons' marginal and correlational firing rates. We use this highly controlled system to examine the behavior of spike train similarity indices commonly used in pattern separation research. We find that all indices (except scaling factor) are sensitive to relative differences in marginal firing rates, but no index adequately captures differences in spike trains that result from altering the correlation in activity between the two neurons. That is, existing pattern separation metrics appear (A) sensitive to patterns that are encoded by different neurons but (B) insensitive to patterns that differ only in relative spike timing (e.g., synchrony between neurons in the ensemble).

Comparison of Color Changes in Paints Based on Ultramarine and Zinc White Resulting from Storage and Thermally Induced Aging

ABSTRACT The paper presents the results of measurements of the L*, a*, and b* color coordinates in the CIEL*a*b*76 (D65/10) space of paint layers of zinc white and ultramarine with several primers and binders. The coordinates are measured for naturally aged reference samples and test samples that underwent two thermal shocks. The color differences of samples obtained using three binders and three primers are quantitatively characterized. It is shown that thermally induced changes in the L* coordinate, as distinct from the a* and b* coordinates, are significantly greater than the changes predicted by the artificial aging protocol. However, during subsequent storage, L* partially relaxes to its original values, and the resulting changes in this coordinate can be considered insignificant. The relaxation effect is also characteristic of the a* and b* coordinates for most samples. Specific results are obtained for paint layers with resin-containing binder on glue–chalk primers. When zinc white is used, such samples have greater L* coordinate and smaller b* coordinate, i.e. appear to be lighter and less yellow in comparison with the remaining samples. When ultramarine is used as a pigment, the resin-containing binder and glue–chalk primers provide the maximum depth of blue color (minimum b* value), which remains almost unchanged with aging. However, the crimson hue characteristic of such samples (greater value of the a* coordinate) is intensified due to heating. The results show that two thermal effects on paint layers separated in time can lead to opposite changes in color coordinates.

Age-Related Development of Bilateral Coordination of the Upper Limbs in Children and Adolescents

Bilateral coordination of the upper limbs (UL) is important for activities of daily living and physical activities. Motor coordination improves from childhood through adolescence. However, age-coordination trajectories for bilateral UL movements are not well-established, and it is unclear if bimanual coordination develops slower than unilateral coordination. In this study we examined age-related changes in UL coordination from childhood to late adolescence. Typically-developing children (N = 29, aged 7–17 years) performed unilateral and bilateral, antiphase cycling tasks with their ULs. Variations in cycling velocity and interlimb phase errors were computed as measures of coordination. Linear regression was used to examine age-coordination effects. Given the sensorimotor processing for bilateral movements and gradual development of the corpus callosum, we hypothesized different relationships between age and coordination for bilateral and unilateral movements. Results showed UL coordination was significantly related to age, where coordination was better in older compared to younger children (p < 0.001); however, there were similar significant effects for unilateral movements. Differences in unilateral and bilateral coordination were not significantly explained by biological sex, although power to detect sex differences was low. We conclude that bilateral and unilateral UL coordination are age-dependent; each improves at similar rates through childhood and adolescence.

Integrative neuromuscular training and detraining in pre-adolescent basketball players

Youth sports participation can promote better physical activity levels and motor competence (MC) in young populations. However, it shows risks of injury and burnout. Integrative neuromuscular training (INT) is presented as a training alternative capable of reducing the incidence of injury and improving MC in young athletes. The aim of this study was to evaluate the effects of 6 weeks of individualized INT as a warm-up in preadolescent basketball players on their acceleration, change of direction (COD), vertical jump (CMJ) and dynamic unipodal balance (SEBT). Subjects (143.37 ± 8.75 cm, 40.66 ± 7.65 kg; 10.08 ± 0.27 years) underwent 20 minutes of INT three days per week during six weeks, where strength, change of direction speed, plyometrics, balance and coordination were trained. Assessments were performed before the intervention (P1), after the intervention (P2), and after 3 weeks of detraining (P3). At P2, significant improvements were obtained in COD test, CMJ, and in the posterolateral direction of the right leg and in the posteromedial direction of the left leg in the SEBT test. At P3, significant improvements were maintained for CMJ and SEBT. An INT warm-up can affect improvements in COD, CMJ and some directions of SEBT in pre-adolescent basketball players.

The Effect of Neuromuscular Fatigue on the Spatiotemporal Coordination of Rowing

Within rowing, lower back disorders (LBDs) are common, but the mechanisms underpinning LBDs are poorly understood. Considering this, it is essential to understand how coordination and motor control change under different constraints such as ergometer rowing and fatigue. This can help better inform movement features linked to LBDs. Measurement of the continuous relative phase (CRP) is a method used to quantify body segment and joint coordination, as CRP measures the spatiotemporal control of multi-joint movement. The purpose of this study was twofold: to examine the general spatiotemporal coordination aspects of ergometer rowing in an unfatigued state, and to quantify how the spatiotemporal coordination of a rowing movement changes in response to a fatigue-inducing rowing trial. Wearable IMUs monitored 20 participants’ movement during a 2000 m ergometer row. The Borg-10 Rating of Perceived Exertion (RPE) scale was used to quantify perceived fatigue. Despite significant RPE increases across all athletes, the spatiotemporal coordination of rowing revealed prevailing strategies for the lumbar spine and lower extremity but no significant effects (α = 0.05) of fatigue on CRP outcomes (MARP, DP), cross-correlation lag (RXY), or range of motion. These findings provide further insight into rowing movements and support the idea that heterogeneous responses to fatigue may exist, requiring further study.

GIT quotient of holomorphic foliations on ℂℙ2 of degree 2 and quartic plane curves

Abstract We study the quotient variety of the space of foliations on ℂ ⁢ ℙ 2 {\mathbb{CP}^{2}} of degree 2 up to change of coordinates. We find the intersection Betti numbers of this variety. As a corollary, we have that these intersection Betti numbers coincide with the intersection Betti numbers of the quotient variety of quartic plane curves. Finally, we give an explicit isomorphism between the space of foliations of degree 2 with different singular points, without invariant lines and the space of smooth quartic plane curves.

Test-retest reliability and minimal detectable change in pelvis and lower limb coordination during running assessed with modified vector coding

The objective of this study was to evaluate the reliability of Modified Vector Coding in assessing the coordination and coordination variability of the lower limbs and pelvis during running and to determine the Minimal Detectable Change (MDC). Twenty-five healthy runners participated in a biomechanical analysis of treadmill running using a motion capture system. Modified vector coding was applied to assess the three-dimensional coordination among various pelvis and lower limb segmental couplings. Reliability was assessed using the Intraclass Correlation Coefficient (ICC), Standard Error of Measurement (SEM), MDC, and Bland-Altman analysis to ascertain measurement consistency, agreement, and the smallest clinically meaningful change that exceeds measurement error. The test–retest reliability for 33 of 42 segmental couplings analyzed was good to excellent, with ICC values ranging from 0.613 to 0.928 (p <0.05), which substantiates the robustness of modified vector coding in running biomechanics. However, nine couplings, particularly femur-tibia in the sagittal plane during midstance and foot in the frontal plane-tibia in the transverse plane during late stance, exhibited poor to moderate reliability. These findings underscore the need for cautious interpretation due to significant proportional bias (p <0.05). SEM and MDC provided insights into the precision and minimal clinically significant changes for each coupling. The findings confirm the reliability of modified vector coding for biomechanical analysis in running, with most couplings demonstrating consistent high reliability. Nevertheless, specific couplings should be interpreted with caution due to potential measurement errors. The application of MDC highlights the precision of modified vector coding in biomechanical analyses and emphasizes the importance of careful interpretation to improve clinical and research outcomes in running-related injuries.

On the Formation of Microstructure for Singularly Perturbed Problems with Two, Three, or Four Preferred Gradients

In this manuscript, singularly perturbed energies with 2, 3, or 4 preferred gradients subject to incompatible Dirichlet boundary conditions are studied. This extends results on models for martensitic microstructures in shape memory alloys (N=2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$N=2$$\\end{document}), a continuum approximation for the J1-J3\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$J_1-J_3$$\\end{document}-model for discrete spin systems (N=4\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$N=4$$\\end{document}), and models for crystalline surfaces with N different facets (general N). On a unit square, scaling laws are proved with respect to two parameters, one measuring the transition cost between different preferred gradients and the other measuring the incompatibility of the set of preferred gradients and the boundary conditions. By a change of coordinates, the latter can also be understood as an incompatibility of a variable domain with a fixed set of preferred gradients. Moreover, it is shown how simple building blocks and covering arguments lead to upper bounds on the energy and solutions to the differential inclusion problem on general Lipschitz domains.

High thermal stability molybdenum-Boosted lithium tellurite glass for radiation shielding

A novel glass system was developed using the melt-quenching technique. The primary aim was to investigate molybdenum-rich compositions (MoO3 > Li2O), with the general formula (69–2x) TeO2–(31+x)–MoO3–xLi2O (where x = 0, 5, 10, and 15 mol%). The physical, structural, thermal, mechanical and radiation shielding properties were evaluated. The synthesized glasses were characterized through their densities, molar volumes, and oxygen packing density, which revealed that the density and molar volume decreased as the amount of Li2O and MoO3 increased in the glass structure, while the oxygen packing density increased as a function of both Li2O and MoO3. Raman spectroscopy was used to analyze the glass structure, which showed a superimposed reduction of all Te units due to the formation of Te–O–Mo and a coordination change from MoO4 to MoO6. The interplay between Li2O and MoO3 has a direct effect on the thermal stability of the glass and reveals that glasses with higher MoO3 content and lower Li2O content exhibit enhanced thermal stability. The mass attenuation coefficient for the synthesized systems varied from 37.07 to 32.38 cm2 g−1 at 0.015 MeV. The fast neutrons removal cross-section exhibits a range from 0.090 to 0.096 cm−1 across all samples, while the thermal neutrons cross section values lie within the interval of 1.22–8.16 cm−1. The glass sample with the highest concentration of TeO2 showed superior values of mass attenuation, and fast neutrons removal cross-section, along with the lowest values of half value layer and mean free path. Nevertheless, the addition of MoO3 and Li2O improved thermal stability and led to adequate radiation protection levels. The results indicate the significant potential of MoO3-rich tellurite materials for shielding against gamma-ray and neutron radiation.

Study of nickel doping induced optical band gap modulation in ZnO nanorods

Nickel doping into ZnO induces morphological change, causes enhancement in the defect states, and leads to better exploitation of visible photons. Nickel ions have a solubility limit of 3% in ZnO, as beyond that, the formation of NiO causes a change of nickel coordination from tetrahedral to octahedral. This changes the hybridization of VB and CB of ZnO, resulting in modulation of the band gap. Raman studies indicate an increase in defect states of ZnO, whereas the PL spectra depict a decrease in its emission due to the trapping of charge carriers by the defect states.

Partial organization and economic coordination: The gradual re-organization of Finnish corporatism

Comparative political economy (CPE) scholarship has drawn various insights from organization theory throughout its existence. Organization theory has made more progress than CPE to explicate the organizational processes behind institutional change. In this paper, we draw on theory of partial organization to describe, interpret, and explain change in the coordination of one Coordinated Market Economy: Finland. We show that Finnish corporatism has become gradually re-organized during the last three decades. We argue that the structural and membership dynamics of partial organization explain some key patterns as well as the shape and timing of institutional change in the face of a changing constellation of economic interests. We argue that theory of partial organization complements the interest-based and institutional explanations of change in economic coordination.

Modeling of the Human Cardiovascular System: Implementing a Sliding Mode Observer for Fault Detection and Isolation

This paper presents a mathematical model of the cardiovascular system (CVS) designed to simulate both normal and pathological conditions within the systemic circulation. The model introduces a novel representation of the CVS through a change of coordinates, transforming it into the “quadratic normal form”. This model facilitates the implementation of a sliding mode observer (SMO), allowing for the estimation of system states and the detection of anomalies, even though the system is linearly unobservable. The primary focus is on identifying valvular heart diseases, which are significant risk factors for cardiovascular diseases. The model’s validity is confirmed through simulations that replicate hemodynamic parameters, aligning with existing literature and experimental data.

Electroluminescent white quantum dot light-emitting diodes based on high pressure synthesis of graphitic C3N4 semiconductor

Graphitic carbon nitride (g-C3N4) has shown promising potentials for quantum dot light-emitting diodes (QLEDs), which might be an effective alternative of the mostly used Cd(Se,S)/Zn(S,Se) emitting layers and can achieve both low toxicity and high stability, meeting the goal of sustainable development. Herein, we for the first report a white electroluminescent QLED device with blue and orange dual-color emissions, which were attributed to the σ*-LP, π*- π, and π*-LP transitions, respectively, from a single-compound g-C3N4 quantum dots (QDs) by synthesizing the precursor at 0.8 Mpa high-pressure N2. By selectively exciting the δ and π bonds with X-ray, the luminescence mechanism was approved with the synchrotron radiation techniques of X-ray absorption near edge structure (XANES) and the X-ray excited optical luminescence (XEOL).The chromaticity coordinate changes from cayan color space with CIE (0.2034, 0.1939) to white color space with CIE (0.3009, 0.2697) as pressure increases from 0.06 to 0.8 Mpa, with the increased overlap of the δ* and π* orbital upon the contraction of crystal lattice. The breakthrough achieved in this work will promisingly promote the development of future white light sources as thin as paper for human home and office lighting by using direct current-driven electroluminescence of QDs, instead of photoluminescence of phosphors.

Using a digital data analytic tool to capture dynamic change in coordination patterns: An exploratory study of the Apollo 13 mission

The operational environment of complex sociotechnical systems is inherently uncertain, demanding constant coordination restructuring to adapt to dynamic situational demands. However, coordination changes in the Human Factors and Ergonomics Field have primarily been studied using static methods, overlooking moment-by-moment adjustments. In the current study, we address coordination restructuring by using THEME, a digital analytical tool capable of visualising and exploring coordination restructuring from a multi-layered perspective. We examine restructuring in coordination patterns during NASA's Apollo 13 Mission, revealing significant shifts from stable, long-duration ‘coordination hubs' in routine operations to shorter-duration patterns during a crisis situation. Additionally, the results highlight the importance of flexible switching between reciprocal and one-directed coordination, along with enhanced role distribution. This study underscores how exploring temporality-sensitive phenomena like coordination through digital technologies such as THEME, advances our understanding of incident analysis and resilient performance within complex systems.