Equal Power Research Articles

Optimizing power sharing and voltage control in DC microgrids using a novel adaptive droop control strategy based on current consensus algorithm

In DC microgrids, a contradiction between power equalization and bus voltage control exists under conventional droop control. To address this issue, this study proposes a current consensus algorithm-based adaptive droop control for hierarchical controlled DC microgrids. The strategy includes primary, secondary, and current-consensus algorithms. In the primary and secondary control layers, an improved droop control strategy is realized, where the secondary layer provides adaptive parameters for primary control. Also, a current consensus algorithm is suggested to ensure equal current sharing, where the iterative calculation results are sent as the input for two control layers. Based on the novel strategy, a small signal analysis is carried out to investigate the relationship between system stability and controller parameters. Finally, simulation and experiments are conducted to assess the effectiveness of the proposed control strategy in complex operating conditions such as resistive load step-change and plug-and-play situation. Experiment and simulation results indicate that the novel control strategy guarantees accurate bus voltage control with a maximum steady-state error of 1.58 % and simultaneously achieves power equalization regardless of line impedance differences and the abrupt change of system status. Moreover, the comparative experiment between the traditional droop control and the proposed strategy verifies the superiority of this novel method.

Energy-efficient two-way full-duplex relay transmission strategy with SWIPT and direct links

In this paper, we improve networks’ spectral efficiency (SE), extend networks’ lifetime, and maximize networks’ energy efficiency (EE) of two-way full-duplex (FD) relay networks. Firstly, to improve networks’ SE and to extend networks’ lifetime simultaneously, we design a two-way FD relay transmission strategy with simultaneous wireless information and power transfer and direct links (DLs). The designed transmission strategy can complete a bidirectional communication in only one time slot with the exists of DLs and the energy-constrained relay node. With the designed transmission strategy, we further give the characteristics of relay amplification factor, the analysis of the designed transmission strategy, and the EE analysis of traditional half-duplex two-way amplify-and-forward relaying. Secondly, to maximize networks’ EE, we present both the EE maximization problems and analyses of the designed transmission strategy with equal power allocation and optimal power allocation. To solve the EE maximization problems, we further propose the alternating optimal algorithm and give complexity analysis of the algorithm. Simulations show that our designed transmission strategy can improve the SE and EE of the networks.

Trust-building in temporary public health partnerships: a qualitative study of the partnership formation process of a Covid-19 test, trace and protect service

BackgroundPublic health initiatives require coordinated efforts from healthcare, social services and other service providers. Organisational theory tells us that trust is essential for reaching collaborative effectiveness. This paper explores the drivers for initiating and sustaining trust in a temporary public health partnership, in response to a sudden health threat.MethodsThis qualitative study analysed the formation process of a multisector partnership for a Covid-19 contact tracing service. Data was collected through 12 interviews, two focus groups, one feedback workshop, and an online survey with workforce members from all seven partner organisations. Purposive maximum variation sampling was used to capture the reflections and experiences of workforce members from all seven partner organisations. A deductive code scheme was used to identify drivers for building and sustaining trust in inter-organisational collaboration.ResultsRelational mechanisms emanating from the commitment to the common aim, shared norms and values, and partnership structures affected trust-building. Shared values and the commitment to the common aim appeared to channel partners’ behaviour when interacting, resulting in being perceived as a fair, reliable and supportive partner. Shared values were congruent with the design of the partnership in terms of governance structure and communication lines reflecting flat hierarchies and shared decision-making power. Tensions between partner organisations arose when shared values were infringed.ConclusionsWhen managing trust in a collaboration, partners should consider structural components like governance structure, organisational hierarchy, and communication channels to ensure equal power distribution. Job rotation, recruitment of candidates with the desired personality traits and attitudes, as well as training and development, encourage inter-organisational networking among employees, which is essential for building and strengthening relationships with partner organisations. Partners should also be aware of managing relational dynamics, channelling behaviours through shared values, objectives and priorities and fostering mutual support and equality among partner organisations.

Experimental investigation of the CO2+SiCl4 mixture as innovative working fluid for power cycles: Bubble points and liquid density measurements

Supercritical CO2 is recognized as a promising working fluid for next-generation of high temperature power cycles. Nevertheless, the use of CO2 mixtures with heavier dopants is emerging as a promising alternative to supercritical CO2 cycles in the recent years for air-cooled systems in hot environments. Accordingly, this work presents an experimental campaign to assess the thermodynamic behaviour of the CO2+SiCl4 mixture to be used as working fluid for high-temperature applications, conducted in the laboratories of CTP Mines Paris PSL. At first, bubble conditions of the mixture are measured in a variable volume cell (PVT technique), then liquid densities are measured with a vibrating tube densimeter, for molar composition in the range between 70 % and 90 % of CO2. The Peng Robinson EoS was fine-tuned on the bubble points obtained, resulting in a satisfactory accuracy level. Finally, a non-conventional methodology has been developed to measure bubble points with the vibrating tube densimeter, whose results are consistent with the VLE data obtained with the standard PVT technique. Thermodynamic analysis in next-generation concentrated solar power plant, at 700 °C turbine inlet, confirms the mixture overcomes 50 % thermal efficiency, providing +4.2 % net electrical output over pure supercritical CO2 at equal thermal power from the solar field.

Beyond Birth Work: Addressing Social Determinants of Health With Community Perinatal Support Doulas.

Adverse maternal and infant health outcomes among African Americans are increasingly recognized as indicators of a critical public health crisis in the United States. Research has found that stress is related to structural racism and the social determinants of health (SDOH) that cause avoidable, unfair inequities in resources, education, power, and opportunities across ethnic groups. This paper describes the SDOH needs and experiences of pregnant Black women from the perspective of doulas and Birthing Beautiful Communities (BBC) clients. The design was a qualitative description, using data collected over time (2017-2018, 2020-2021, and 2023). This study took place in Cleveland and Akron, Ohio and the sample included 58 clients, 26 doulas, and 2 resource intake specialist assistants (RISAs). Qualitative data included individual client interviews, three doula focus groups, and one interview with two BBC RISAs. Three coders used content analysis to deductively identify SDOHs and calculate the number of interviews that contained information about specific SDOHs. Although the sample reported issues with all SDOH, particular ones caused a cascade of SDOH effects. Transportation issues, for example, impeded women from being able to make it to work, doctor's appointments, and to purchase essential baby items (e.g., food, infant supplies). An inability to work-whether because of transportation challenges or pregnancy-related health complications-led to unstable housing and an inability to deal with transportation challenges. Many clients mentioned that housing was a major issue, with many clients experiencing housing instability. Implications include ensuring SDOH information is collected from a trusted source who can advocate and ensure access to a wide range of local resources, ensuring policies protect pregnant women from experiencing a cascade of SDOH that may contribute to continuing health disparate infant and maternal health outcomes in African American women.

Minimum loss optimization of flywheel energy storage systems via distributed adaptive dynamic programming

AbstractIn this article, a distributed controller based on adaptive dynamic programming is proposed to solve the minimum loss problem of flywheel energy storage systems (FESS). We first formulate a performance function aiming to reduce total losses of FESS in power distribution applications. Then we use the Hamilton–Jacobi–Bellman (HJB) equation to solve this optimal control problem. The solution of the HJB equation is approximated by neural networks. To achieve distributed control, we estimate the global variables in the HJB equation by using the dynamic average consensus algorithm. A barrier Lyapunov function and a saturation function are introduced to handle the issue of state and input constraints, respectively. Then the stability of the system is proved through the Lyapunov stability analysis. Finally the effectiveness of the proposed strategy is verified by simulations. Simulation results show that FESS can track the power command while minimizing total power losses by interacting with neighbors. The proposed algorithm leads to a loss reduction of compared to the equal power distribution strategy.

How Intimate Partner Violence Is Influenced by Social Identity Among Sexual Minority Men.

Purpose: Sexual minority men (SMM) experience intimate partner violence (IPV) at disproportionately high rates. The objective of this article was to identify the experiences of SMM and health care providers on how social identity impacts IPV. Methods: SMM participants (N = 23) were recruited from online community settings and a lesbian, gay, bisexual, transgender, queer, and others (LGBTQ+) organization in Los Angeles; providers (N = 10) were recruited from LGBTQ+ organizations. Semistructured interviews were audio recorded and transcribed verbatim. An applied thematic analysis approach was implemented to create memos, inductively generate a codebook, apply codes to the transcripts, and identify key themes in data. Results: Three main themes were identified. The first theme was weaponizing social identity to control a partner, which had three subthemes: (1) immigration status, race/ethnicity, and skin color, (2) threatening to "out" the partner's sexual orientation, and (3) abusing power inequity. Men who perpetrated IPV often used minority identities or undisclosed sexuality to leverage power over their partner. The second theme was use of IPV to establish masculinity, by exerting power over the more "feminine" partner. The third theme was internalized homophobia as a root cause of IPV, which details how internalized homophobia was often expressed in violent outbursts toward partners. Conclusion: These findings highlight how IPV among SMM can be influenced by social and sexual identity. Future research must consider socially constructed power structures and the multiple identities of SMM when developing interventions to address IPV in this population.

Power or opportunity? Perceived inequality on life satisfaction explained by reduced trust in South Korea

AbstractThis paper presents new evidence linking different aspects of perceived inequality (education, employment, law enforcement, income and wealth, power, and gender) to life satisfaction. Using large‐scale national survey data, we examined the relationships between the six aspects of perceived inequality, life satisfaction, and generalized trust among South Koreans (N = 17,357). Exploratory structural equation modelling identified a two‐factor structure of perceived inequality: Opportunity Inequality (inequalities in education and employment) and Power Inequality (inequalities in income and wealth, law enforcement, power, and gender). Results from mediation analysis suggested that both aspects of inequality negatively predicted life satisfaction via reduced generalized trust. Those processes were consistent regardless of household income. The study underscores the critical impact that public perceptions of (in)equality in various opportunity and power aspects have on well‐being and trust and emphasizes the urgency of government and policy action to address the growing problem of inequality in South Korean society. The findings highlight the urgent need to address disparities and promote social harmony and well‐being in countries facing similar challenges.

On the refinements of some important inequalities with a finite set of positive numbers

In this research, a novel method for enhancing the Hölder–Işcan inequality through the utilization of both integrals and sums, as well as the mean power inequality, has been introduced. This approach outperforms traditional Hölder and mean power integral inequalities by employing a finite set of functions. Through the careful selection of the function , an entirely new category of classical inequalities emerges for both Hölder and mean power inequalities.

Power equalization model based on neural networks for unequal power DOA estimation

Power equalization model based on neural networks for unequal power DOA estimation

Moving Forward to a World Free of Nuclear Weapons (?): How Regional Issues Shape Global Non-proliferation and Disarmament Politics

This special issue contributes to the global dialogue on a nuclear weapons ban by evaluating how regional politics enable or hinder a global ban on nuclear weapons. The insights of 17 contributions offer a nuanced and diverse account of the landscape of nuclear disarmament, arguing that understanding the diversity of regional perspectives, lenses, and approaches is crucial for advancing toward a global nuclear weapons ban. This introduction sets the stage for a detailed exploration of common themes, aiming to shed light on the structural elements that characterize regional and global nuclear politics. For that, we employ a Comparative Area Studies Approach to explore venues and patterns across different regions, offering a comprehensive analysis that underscores the importance of considering local, regional, and global dimensions in tandem. We delineate three key elements that either facilitate or impede the implementation of a nuclear weapons ban: (1) Inclusivity: How key actors participate and are included in the policy-making process at the global, regional, and local levels; (2) Inequalities: how power inequalities shape social processes that enable or hinder the continuity of nuclear weapons; (3) Institutions: how networks and institutions are organized and structured between each other.

Decoding Iran's meme culture and implications in journalism

The study of digital humour and meme culture as a complex phenomenon, given the growing consumption and popularity of memes, especially among digital technology speakers, coupled with the scarcity of scholarly attention and research on this topic in Iran, has become increasingly relevant. This article focuses on the complex interplay between memes, culture and technology. By analysing the integral role of humour in Iranian digital culture, the study aims to explore the nature and functions of Iranian meme culture. The analysis shows that Iranian digital humour and meme culture function as a platform for equal opportunities to laugh, challenge established cultural norms and question prevailing ideologies. The research methodology is based on the reproduction of gender conventions and power hierarchies in Iran through internet memes. The methods applied are: content analysis, distributive and comparative. The study also builds on Bakhtin's concept of "chronotope" in multimodal analysis of memes common among Iranian immigrants. The novelty of the study lies in the fact that it makes a valuable contribution to the field of journalism and media studies, highlighting the importance of understanding the role of humour and memes in shaping public perception and navigating complex ideological landscapes, as well as the ways in which memes can be used to disrupt or alter these dynamics. The results of the analysis of Iranian digital humour and memes show that meme culture functions as a means to combat inequalities in power and status. In addition, the study demonstrated the Iranian population's reinterpretation of the immigrant experience, thereby reaffirming and refining their hybrid identity as transnational Iranians. This process unfolds through the recreation of different spatio-temporal configurations within the meme.

Missing in action: a scoping review of gender as the overlooked component in decolonial discourses

IntroductionRace and gender were intimately intertwined aspects of the colonial project, used as key categories of hierarchisation within both colonial and modern societies. As such, true decolonisation is only possible...

Phase delay through slot-line beam switching microstrip patch array antenna design for sub-6 GHz 5G band applications

Two, four, eight, and sixteen-element patch array antennas for beam switching are presented in this study. For a 1×2 array, an aperture-coupled feeding mechanism is used to feed patches while a slot line on the ground plane provides the phase delay between antenna elements. The 1×2 array is used to create the 2×2, 4×2, and 8×2 arrays, and an equal power divider provides the signal for each. For applications in the 5G sub-6 GHz frequency spectrum, the antennas are modeled. With -37.14 dB, -17.85 dB, -21.51 dB, and -26.03 dB return loss for two, four, eight, and sixteen-element array antennas respectively the simulation demonstrates that the antennas are properly matched at the resonant frequency. The antennas can switch its radiated beam to ±24<sup>o</sup>, ±24<sup>o</sup>, ±28<sup>o</sup>, and ±26<sup>o</sup> with gains of 8.97 dBi, 11.19 dBi, 13.23 dBi, and 16.24 dBi, respectively at the resonance frequency. The directivity of the proposed antenna is found to be 9.17 dBi, 11.20 dBi, 13.40 dBi, and 16.45 dBi respectively. The antennas are constructed with two 0.8 mm-thick Teflon substrate layers. The ground plane between the two substrate layers contains the aperture and the slot line that generates the phase delay.

The Ellipticity of High Frequency Transionospheric Radio Waves

AbstractThe polarization state of transionospheric high frequency (HF) radio waves can be determined using the crossed‐dipole antennas of the Radio Receiver Instrument (RRI) onboard Enhanced Polar Outflow Probe (e‐POP) on the CAScade, Smallsat, and IOnospheric Polar Explorer/Swarm‐E satellite. Coordinated experiments between ground radars and RRI showed that the radio waves have high ellipticity angles (elliptical or circular polarization) for propagation direction 6°–25° from the perpendicular direction to the local geomagnetic field. However, from magnetoionic theory and a typical assumption of roughly equal power in the O‐ and X‐modes, radio waves can have high ellipticity angles only when the propagation direction is within 10° of perpendicularity. This investigation uses coordinated experiments between the Saskatoon SuperDARN radar and RRI. Magnetoionic modeling reveals that the relative strengths of the O‐ and X‐modes for the HF radio waves transmitted from the Saskatoon SuperDARN change significantly poleward of the radar. Differences in the relative power between the two wave modes were found to significantly modify the polarization state of radio waves, and govern the sense of rotation of the wave. Even a relatively modest 2–5 dB power difference in the X‐mode over the O‐mode was found to result in unexpected observations of circularly polarized radio waves at aspect angles 6°–10° from perpendicular, and unexpected elliptically polarized waves observed at aspect angles more than 10° from perpendicular. Therefore, a combination of RRI observations and modeling, which accounts for relative differences in the O‐ and X‐mode powers, was used here to better understand the unexpected observations of polarization states of transionospheric radio waves.

Operational decisions of photovoltaic closed-loop supply chains with industrial distributed photovoltaic subsidy policy in China

Photovoltaic (PV) generation, as a clean and renewable energy technology, aligns with the global needs for energy transition and sustainable development. Due to its industrial distributed PV subsidy support policy, China has witnessed rapid growth in distributed PV industrial projects, leading to the formation of a mature market trading mechanism. This paper, focusing on China’s industrial distributed PV and its user, aims to explore how the PV system manufacturer (PSM) and PV system service provider (PSSP) can optimize the combination of “recycling mode & power structure” to simultaneously achieve multiple performance improvements, including those in economy, society, and environment (ESS) in the photovoltaic closed-loop supply chain (PV-CLSC), in consideration of the government’s PV subsidy policy. Therefore, by using three game-theoretical approaches including Nash game existed between the PSM and the PSSP under equal power and the Stackelberg game respectively led by PSM and PSSP, the optimal decisions of the PSM and PSSP, and the effective government subsidies under different combinations are obtained. Conclusions show that: To achieve individual optimal economic performance, both PSM and PSSP, as recyclers, invariably prefer a dominant position and choose to conduct recycling activities independently. For social welfare and subsidy efficiency, the government consistently tends to choose the PSM recycling mode in which the PSM and PSSP are expected to be in an equal power structure. Both in the PSM recycling and PSSP recycling modes, the government subsidy is smaller when two members are under the equal position than that respective under the dominant position, and in the latter scenario, the one with the advantage can mainly obtain the difference in the increased government subsidy.

High temperature, bargaining power and within-firm wage inequality: Evidence from China

Climate change poses a significant challenge to the sustainable development of modern society, while its influence on income inequality remains understudied. This study examines how high temperature affects within-firm wage inequality using Chinese listed companies from 2006 to 2020. Results suggest that high temperature significantly increases managerial compensation while reducing employee wages, thereby exacerbating within-firm wage inequality. The main driver is the disparity in bargaining power between management and employees. China's 2012 heat subsidy policy has mitigated this inequality. Heterogeneity analysis reveals that in environments where employees wield more bargaining power, such as state-owned enterprises, sectors employing highly skilled workers, and regions with stronger unions, the negative impact is less pronounced. Conversely, in developed managerial markets, regulated industries, and large enterprises, where management holds stronger bargaining power, this impact is notably significant. These findings offer crucial insights for policymakers and stakeholders in addressing climate risks and regulating income distribution.

Balance of Power in Peer Victimization: The Role of Rivalry and Vulnerability

This study investigated characteristics associated with two kinds of peer victimization—bullying victimization and adversarial victimization—distinguished by different balances of power between the perpetrator and victim. Specifically, we examined whether bullying victimization (victim has less power than perpetrator) would be experienced to a greater extent by vulnerable adolescents with psychosocial difficulties (fewer close friendships, emotional symptoms) and less peer esteem (physical attractiveness, perceived popularity, dating popularity, and prestige). In contrast, we investigated whether adversarial victimization, in which the victim has equal or greater power than perpetrator, would be experienced by adolescents perceived as rivals because they are held in high esteem by peers. A total of 599 adolescents aged 9 to 14 years ( M = 11.93; SD = 1.40) completed a self-report measure of emotional symptoms and peer nomination measures of victimization, close friendship, physical attractiveness, dating popularity, perceived popularity, and prestige. Bullying victimization was negatively associated with close friendships, physical attractiveness, perceived popularity, and prestige, whereas adversarial victimization was positively associated with all four indicators of peer esteem. The results demonstrate the importance of measuring the power balance between the perpetrator and victim when studying peer victimization. Findings are discussed from an evolutionary perspective suggesting that victims of bullying are selected by perpetrators to achieve adaptive benefits while minimizing retaliatory, reputational, and social costs, whereas victims of adversarial aggression are targeted as rivals in competition for status and mates.

“The Citizen” as a Ghost Subject in Co-Producing Smart Sustainable Cities: An Intersectional Approach

The importance and benefits of engaging citizens as co-producers of urban transformation have been increasingly recognised. However, the mere implementation of citizen co-production does not guarantee more legitimate or inclusive policy decisions and outcomes, especially when power inequalities that shape local decision-making remain unaddressed. This article examines the transformative potential of citizen co-production in smart sustainable city initiatives using two successive citizen panels in Trondheim, Norway, as cases. The study aimed to understand the role of citizen co-production in these panels, and the notion of “the citizen” within their frameworks. Three challenges with co-production were identified. Firstly, the ad-hoc nature of citizen engagement emphasised individual participation rather than facilitating collective spaces from which political agency could emerge. Secondly, citizens’ viewpoints were perceived as uninformed preferences that could be transformed through professional guidance. This, coupled with the closed nature of the initiatives, raises questions about the transformative potential of the processes, particularly in challenging the underlying premises of citizen co-production shaped by a neoliberal discourse of smart sustainable cities. The article concludes with a call to analyse citizen co-production spaces through an intersectional lens that attends to relational understandings of power dynamics and identities. This analysis should not only consider who participates, but also how “the citizen” as a subject is conceptualised and mobilised, how citizens’ interests and knowledge are taken into account, and the political significance of their involvement.

Dis/re-orienting design through norm-critical gender lenses: an educational case in Turkey.

Design, as a practice of developing solutions beyond products, and increasingly services and policies, inevitably poses an impact on gender (in)equality which remains largely unrecognized by design practitioners. This paper advocates the urgent need for adopting gender lenses in design education for sustainable cultural transformation through proper recognition of the complexity of any societal and cultural issue, power relations and inequalities, and introduces an initial attempt through a graduate-level educational design project. Throughout the project, students critically reflected on existing orientations in designing to develop norm-critical gender lenses, contained the resultant disorientation emerging from the contrast between their critical approaches and local contexts, and explored novel directions as reorientation to address four different societal and cultural issues and develop 11 design outcomes aiming at gender equality, social justice-oriented empowerment, and cultural transformation. The authors analyzed the design processes and outcomes to reveal opportunities and challenges for developing and deploying norm-critical gender lenses in tackling complex, intersecting socio-cultural and political issues, under three themes: gender stereotypes, norms, expectations, and roles; intersectional power relations and inequalities embedded in the social structure; and social justice-oriented empowerment beyond the market-oriented individualistic neoliberal order. A shift in the perceptions of the role of designers, from creator/problem-solver to facilitator/participant, and design outcomes, from absolute solutions to intermediaries of sociological and political imaginations, is found crucial in this endeavor, which requires safe spaces for future designers to reflect on existing orientations, contain disorientation with negative capability, and explore novel ways through reorientation.