Dynamic capacitor bank

Low power factor systems run inefficiently and cause power companies to lose thousands of dollars with wasted power. Correction systems currently implement static capacitor solutions to offset this power factor; however, companies where the power factor varies significantly need a better solution. In this paper, we discuss a reactive power factor correction system that could greatly benefit companies with this problem. The system is in its prototype state, which comprises of a capacitor bank, sensing circuit, a switching circuit and a microprocessor; we named it the Dynamic Capacitor Bank. During our project, we were able to get a sensing circuit to sense load voltage and current, as well as design a switching circuit and an inductive load for testing of the system. Our system performed the necessary steps to correct a power factor; however, we were limited by the power levels allowed for a senior design project and could not show precise information. Overall, a Dynamic Capacitor Bank could greatly benefit systems with varying power factor

‘It has totally changed how I think about the police’: COVID-19 and the mis/trust of pandemic policing in Aotearoa New Zealand

In the initial phase of COVID-19, Aotearoa New Zealand was internationally praised for its pandemic response that included lockdowns to control the spread and work towards elimination. Community compliance with control measures was thus essential when pursuing elimination as a policy. Using a mixed-methods approach, we sought to explore whether New Zealand Police (NZP) were trusted to police the lockdown rules at Levels 4 and 3. We analyzed 1,020 survey responses comparing trust among respondents who had been stopped by NZP over the lockdown rules (contacts) with those who had not (non-contacts). We found that both contacts and non-contacts expressed greater trust in NZP to enforce the Level 4 than the Level 3 rules; contacts expressed less trust in NZP to enforce the lockdown rules than non-contacts; contacts perceived NZP more heavy-handed than non-contacts; contacts perceived NZP as only somewhat procedurally just and feeling somewhat encouraged to comply with the lockdown rules and; that unexpected high-profile policing-related events during the survey only affected contacts’ trust significantly. We offer two explanations: (1) NZP were perceived as procedurally unjust or inconsistent in applying the lockdown rules, (2) members of the public and NZP learned the lockdown rules simultaneously. We caution that the unfamiliar character of pandemic policing may jeopardize trust in NZP even among segments of the population that typically express high levels of trust in NZP, i.e., people of European descent. We conclude that community compliance with pandemic control measures is no matter to be dealt with by the criminal legal system

Lockdown Ibuism: experiences of Indonesian migrant mothers during the COVID-19 pandemic in Aotearoa New Zealand

Lockdowns imposed to curb the spread of COVID-19 have been widely shown to heighten care burdens within households and ‘bubbles.’ Responsibility for meeting such burdens often falls disproportionately upon women. It is nevertheless important for research on gendered inequalities during COVID-19 to attend to the particularities of how such care work was experienced by differently positioned women. In Aotearoa New Zealand, Indonesian migrant mothers’ experiences of lockdown were mediated by the disadvantages they faced as ‘non-native’ speakers of English, as well as by the ideology of Ibuism (‘motherism’) they were socialised into during their lives in Indonesia. This socialisation led many to find life under lockdown life both rewarding and stressful in ways distinct from other women and mothers in Aotearoa New Zealand who were confronting similar demands. We thus argue for the importance of a qualitative and intersectional approach

The most difficult time of my life or ‘COVID’s gift to me’? Differential experiences of COVID-19 funerary restrictions in Aotearoa New Zealand

In 2020, the government of Aotearoa New Zealand imposed some of the most stringent funerary restrictions in the world as part of its efforts to eliminate COVID-19. This article explores how people experienced this situation, asking why restrictions that some described as precipitating ‘the most difficult time of their lives’ were described by others as a ‘relief’, ‘blessing’, or ‘gift’. Much existing literature frames funerary restrictions as a distressing assault upon established ways of grieving to which mourners must try to adapt–and in Aotearoa, both the stringency of the restrictions and the means by which they had been imposed did lead to many people finding them challenging. However, for those with ambivalent pre-existing feelings regarding their funerary traditions–such as many in the Samoan diaspora–COVID-19 restrictions afforded both a reprieve from burdensome practices and a much-welcomed opportunity to reimagine their traditions. Funerary restrictions, though disruptive, are thereby shown to have generative potential

Investigating light sensitivity in bipolar disorder (HELIOS-BD)

Many people with bipolar disorder have disrupted circadian rhythms. This means that the timing of sleep and wake activities becomes out-of-sync with the standard 24-hour cycle. Circadian rhythms are strongly influenced by light levels and previous research suggests that people with bipolar disorder might have a heightened sensitivity to light, causing more circadian rhythm disruption, increasing the potential for triggering a mood switch into mania or depression. Lithium has been in clinical use for over 70 years and is acknowledged to be the most effective long-term treatment for bipolar disorder. Lithium has many reported actions in the body but the precise mechanism of action in bipolar disorder remains an active area of research. Central to this project is recent evidence that lithium may work by stabilising circadian rhythms of mood, cognition and rest/activity. Our primary hypothesis is that people with bipolar disorder have some pathophysiological change at the level of the retina which makes them hypersensitive to the visual and non-visual effects of light, and therefore more susceptible to circadian rhythm dysfunction. We additionally hypothesise that the mood-stabilising medication lithium is effective in bipolar disorder because it reduces this hypersensitivity, making individuals less vulnerable to light-induced circadian disruption. We will recruit 180 participants into the HELIOS-BD study. Over an 18-month period, we will assess visual and non-visual responses to light, as well as retinal microstructure, in people with bipolar disorder compared to healthy controls. Further, we will assess whether individuals with bipolar disorder who are being treated with lithium have less pronounced light responses and attenuated retinal changes compared to individuals with bipolar disorder not being treated with lithium. This study represents a comprehensive investigation of visual and non-visual light responses in a large bipolar disorder population, with great translational potential for patient stratification and treatment innovation.</p

Timing of seasonal influenza epidemics for 25 countries in Africa during 2010-19: a retrospective analysis.

BACKGROUND: Using country-specific surveillance data to describe influenza epidemic activity could inform decisions on the timing of influenza vaccination. We analysed surveillance data from African countries to characterise the timing of seasonal influenza epidemics to inform national vaccination strategies. METHODS: We used publicly available sentinel data from African countries reporting to the WHO Global Influenza Surveillance and Response FluNet platform that had 3-10 years of data collected during 2010-19. We calculated a 3-week moving proportion of samples positive for influenza virus and assessed epidemic timing using an aggregate average method. The start and end of each epidemic were defined as the first week when the proportion of positive samples exceeded or went below the annual mean, respectively, for at least 3 consecutive weeks. We categorised countries into five epidemic patterns: northern hemisphere-dominant, with epidemics occurring in October-March; southern hemisphere-dominant, with epidemics occurring in April-September; primarily northern hemisphere with some epidemic activity in southern hemisphere months; primarily southern hemisphere with some epidemic activity in northern hemisphere months; and year-round influenza transmission without a discernible northern hemisphere or southern hemisphere predominance (no clear pattern). FINDINGS: Of the 34 countries reporting data to FluNet, 25 had at least 3 years of data, representing 46% of the countries in Africa and 89% of Africa's population. Study countries reported RT-PCR respiratory virus results for a total of 503 609 specimens (median 12 971 [IQR 9607-20 960] per country-year), of which 74 001 (15%; median 2078 [IQR 1087-3008] per country-year) were positive for influenza viruses. 248 epidemics occurred across 236 country-years of data (median 10 [range 7-10] per country). Six (24%) countries had a northern hemisphere pattern (Algeria, Burkina Faso, Egypt, Morocco, Niger, and Tunisia). Eight (32%) had a primarily northern hemisphere pattern with some southern hemisphere epidemics (Cameroon, Ethiopia, Mali, Mozambique, Nigeria, Senegal, Tanzania, and Togo). Three (12%) had a primarily southern hemisphere pattern with some northern hemisphere epidemics (Ghana, Kenya, and Uganda). Three (12%) had a southern hemisphere pattern (Central African Republic, South Africa, and Zambia). Five (20%) had no clear pattern (Côte d'Ivoire, DR Congo, Madagascar, Mauritius, and Rwanda). INTERPRETATION: Most countries had identifiable influenza epidemic periods that could be used to inform authorities of non-seasonal and seasonal influenza activity, guide vaccine timing, and promote timely interventions. FUNDING: None. TRANSLATIONS: For the Berber, Luganda, Xhosa, Chewa, Yoruba, Igbo, Hausa and Afan Oromo translations of the abstract see Supplementary Materials section