This paper introduces a three-substrate layered transmitarray design that avoids the use of vias, aiming to produce broadband orbital angular momentum (OAM) vortex beams within the Ka-band. The suggested element configuration accomplishes a full 360∘ transmission phase while upholding a 1-dB transmission loss, with an overall thickness measuring 3.4 mm (equivalent to 0.34λ0 at 30.0 GHz). Its balanced unit cell arrangement amplifies its effectiveness in applications involving dual polarization. We examine the transmitarray behavior across four OAM modes (+1, +2, +3, +4 ), unveiling notable mode purity at operating frequency. Specifically, a broadband OAM vortex beam is achieved for the +1 mode during simulation. A square aperture transmitarray fed by a horn antenna is fabricated and measured to validate these simulated findings. Experimental results confirm the successful broadband vortex beam generation for $l = +1$ mode across the frequency spectrum from 27.0 to 40.0 GHz, approximately 43.3%. Additionally, the proposed transmitarray achieves a peak gain of 21.7 dBi, accompanied by an 11.8% aperture efficiency. Noteworthy is the consistent maintenance of mode purity above 86%.

Residents of long-term care facilities (LTCFs) were disproportionately affected by the COVID-19 pandemic. We assessed the extent to which hospital-associated infections contributed to COVID-19 LTCF outbreaks in England. We matched addresses of cases between March 2020 and June 2021 to reference databases to identify LTCF residents. Linkage to health service records identified hospital-associated infections, with the number of days spent in hospital before positive specimen date used to classify these as definite or probable. Of 149,129 cases in LTCF residents during the study period, 3,748 (2.5%) were definite or probable hospital-associated and discharged to an LTCF. Overall, 431 (0.3%) were identified as index cases of potentially nosocomial-seeded outbreaks (2.7% (431/15,797) of all identified LTCF outbreaks). These outbreaks involved 4,521 resident cases and 1,335 deaths, representing 3.0% and 3.6% of all cases and deaths in LTCF residents, respectively. The proportion of outbreaks that were potentially nosocomial-seeded peaked in late June 2020, early December 2020, mid-January 2021, and mid-April 2021. Nosocomial seeding contributed to COVID-19 LTCF outbreaks but is unlikely to have accounted for a substantial proportion. The continued identification of such outbreaks after the implementation of preventative policies highlights the challenges of preventing their occurrence.

Sustainability of maize production systems is threatened by poor economic returns and resource intensiveness. Therefore, an experiment was conducted at the ICAR-Indian Agricultural Research Institute, New Delhi during 2016–17 to 2017–18 to assess the effect of tillage and microbial inoculantsintegrated phosphorus (P) management on productivity, quality, economic outcome and energy dynamics of maize. Three tillage practices viz., CT–R (conventional tillage with no residue), ZT–R (zero tillage with no residue) and ZT + R (zero tillage with wheat crop residue at 2.5 Mg/ha) were assigned in main plots and five P management practices viz., P1 (control–NK as per recommendation, but no P), P2 (17.2 kg P/ha), P3 (17.2 kg P/ha + PSB), P4 (17.2 kg P/ha + compost inoculants) and P5 (34.4 kg P/ha) were allocated in subplots in three times replicated split-plot design. The maximum grain yield (5.96 Mg/ha), protein content (9.13%), protein yield (546 kg/ha) and gross energy returns (209 × 103 MJ/ha) were recorded under ZT + R while higher benefit: cost ratio (B: C ratio – the amount of economic gain per unit investment) (1.53) and energy efficiency (12.5) was noticed under ZT–R. Among the P management practices, the application of 34.4 kg P/ha recorded the highest grain yield (6.45 Mg/ha), protein content (9.34%), protein yield (603 kg/ha), B: C ratio (1.65) and energy efficiency (10.1). The results suggested that the application of P at the rate of 34.4 kg/ha under ZT + R is an economically robust approach for the quality maize production in semi-arid region.

Sexual violence against women is commonly justified in sub-Saharan Africa (SSA) despite international commitments to halt it. This study investigated the association between healthcare decision-making capacity and the justification of sexual violence among women in SSA. We used current datasets of 30 sub-Saharan African countries published between January 2010 and December 2018. The sample included 259,885 women who were in sexual unions. We extracted and analysed the data with Stata version 14. Chi-square test and multilevel logistic regression models were used to analyse the data. Results for the regression analysis were presented as adjusted odds ratios (AOR) with their corresponding 95% confidence intervals (CIs). The results showed that women who decided on their healthcare alone had lower odds [AOR=0.93; CI=0.91–0.96] of justifying sexual violence compared to those who were not deciding alone. We also found that women aged 45-49 [AOR=0.85; CI=0.82-0.89], those with higher education [AOR=0.26; CI=0.24-0.29], cohabiting women (AOR=0.82, CI=0.80-0.85], richest women [AOR= 0.58; CI=0.56-0.60], women living in urban areas [AOR=0.74; CI=0.73-0.76], and Christians [AOR=0.52; CI=0.51-0.54] had lower odds of justifying wife beating if a woman refuses to have sex with her partner. On the contrary, women who engaged in agriculture had higher odds of justifying sexual violence than those who were not working [AOR=1.07; CI=1.04-1.09]. Groups that should be prioritised with anti-sexual violence initiatives are the poor, rural residents, and young women. It is also vital to institute policies and interventions focused on educating men about women’s right to make decisions, and why partner violence is unjust and intolerable.

Sexual violence has proven to be associated with sexually transmitted infections (STIs) in sub-Saharan Africa (SSA). We examined the association between sexual violence and self-reported STIs (SR-STIs) among women in sexual unions in 15 sub-Saharan African countries. This was a cross-sectional study involving the analysis of data from the Demographic and Health Surveys (DHS) from 15 countries in SSA. A total sample of 65,392 women in sexual unions were included in the final analysis. A multilevel binary logistic regression analysis was carried out and the results were presented using adjusted odds ratios (aOR) at 95% Confidence Interval (CI). Women who experienced sexual violence in the last 12 months were more likely to self-report STIs compared to those who did not experience sexual violence [aOR = 1.76, 95% CI = 1.59-1.94]. Compared to women in Angola, those who were in Mali, Nigeria, Sierra Leone, Uganda, and Liberia were more likely to self-report STIs while those in Burundi, Cameroon, Chad, Ethiopia, Malawi, Rwanda, South Africa, Zambia, and Zimbabwe were less likely to self-report STIs. The study has revealed variations in the country level regarding the prevalence of sexual violence and SR-STI in the last 12 months among women in sexual unions in the selected countries. This study has demostrated that sexual violence in the last 12 months is associated with SR-STIs among women in sexual unions. Moreover, factors that predict SR-STIs were observed in this study. Policymakers and agencies that matter could consider the factors identified in this study when designing policies or strengthening existing ones to tackle STIs among women in SSA. To accelerate the progress towards the achievement of Sustainable Development Goal 3, its imperative efforts and interventions must be intensified in SSA to reduce sexual violence which will go a long way to reduce SR-STIs among women.

Two commonly linked harmful practices that negatively impact the health of girls and women in sub-Saharan Africa, and threaten their development and quality of life, are female genital mutilation and girl-child marriage. The central focus of the study was to investigate the association between female genital mutilation and girl-child marriage in sub-Saharan Africa. Data from the most recent Demographic and Health Surveys of twelve sub-Sahara African countries were pooled. A total of 14,748 women aged 20–24 were included in the study. A multilevel logistic regression analysis was employed, with reported adjusted odds ratios (aORs) and associated 95% confidence intervals (CIs). The overall prevalence of FGM in the twelve countries was 52.19%, with the highest prevalence in Guinea (97.17%). The overall prevalence of girl-child marriage in the twelve countries was 57.96%, with the highest prevalence in Chad (78.06%). Women who had never experienced female genital mutilation were less likely to experience girl-child marriage (aOR=0.76, CI=0.71–0.82) compared with those who had ever experienced female genital mutilation. Age 24 (aOR=0.47, CI=0.43–0.52), secondary/higher level of education (aOR=0.31, CI=0.28–0.35), richest wealth quintile (aOR=0.56, CI=0.47–0.66), exposure to mass media (aOR=0.81, CI=0.74–0.88) medium community literacy level (aOR=0.63, CI=0.57–0.69) and low community socioeconomic status (aOR=0.67, CI=0.49–0.92) were found to be protective against girl-child marriage. The findings reveal that female genital mutilation is associated with girl-child marriage in sub-Saharan Africa. The continued practice will adversely affect the reproductive health outcomes of girls in the sub-region. Policies aimed at eliminating female genital mutilation and girl-child marriage should focus on compulsory basic education, poverty alleviation and increasing access to mass media. Further, campaigns should cover more communities with lower literacy levels and medium socioeconomic status.

Women’s ability to negotiate for safer sex has effects on their sexual and reproductive health. This study investigated the association between safer sex negotiation and parity among women in sub-Saharan Africa. The data were sourced from the Demographic and Health Surveys of 28 sub-Saharan African countries conducted from 2010 to 2019. A total of 215,397 women aged 15–49 were included in the study. Multilevel logistic analysis was conducted to examine the association between safer sex negotiation and parity among women in sub-Saharan Africa. The results were presented as adjusted odds ratios (aOR) and the significance level set at p<0.05. The overall prevalences of safer sex negotiation and high parity among women in sub-Saharan Africa were 82.7% and 52.1%, respectively. The prevalence of high parity ranged from 32.3% in Chad to 72.1% in Lesotho. The lowest prevalence of safer sex negotiation was in Chad (16.8%) while the highest prevalence was recorded in Rwanda (99.7%). Women who had the capacity to negotiate for safer sex were less likely to have high parity compared with those who had no capacity to negotiate for safer sex (aOR = 0.78, CI: 0.75–0.81). Other factors that were associated with high parity were age, educational level, marital status, exposure to media, contraceptive use, religion, wealth quintile, sex of household head, and place of residence. The study identified significant association between safer sex negotiation and high parity among women of reproductive age in sub-Saharan Africa. It is worth noting that women’s ability to negotiate for safer sex could reduce high parity among women in sub-Saharan Africa. Therefore, policies and programmes aimed at birth control or reducing high parity among women could be targeted at improving their capacity to negotiate for safer sex through education.

This study investigated the association between comprehensive HIV/AIDS knowledge and HIV testing among men in sub-Saharan Africa (SSA). Data were taken from the most recent (2010–2019) Demographic and Health Survey men’s recode files of 29 countries in SSA. A total of 104,398 men who had complete information on all the variables of interest were included in the study. The outcome variable was HIV testing. A multilevel logistic regression analysis was conducted to determine the association between comprehensive HIV/AIDS knowledge and HIV testing. The results of the fixed effects model were presented as adjusted odds ratios (AORs) with 95% confidence intervals (CIs). The average prevalences of HIV testing and comprehensive HIV/AIDS knowledge among men in SSA were 53.5% and 50.8% respectively. Rwanda and Niger recorded the highest (93.6%) and lowest prevalences (9.8%) respectively. The prevalence of comprehensive HIV/AIDS knowledge among men in the 29 countries was 50.8%, with the highest in Rwanda (76.4%) and the lowest in Benin (31.1%). Men who had no comprehensive HIV/AIDS knowledge were less likely to test for HIV compared with those who had comprehensive HIV/AIDS knowledge (AOR=0.59, CI: 0.57–0.60). Men who were older than 20 years, married or cohabiting, with at least secondary education, in the richest wealth quintile, exposed to mass media, used condoms and with multiple sexual partners were more likely to test for HIV. To improve HIV testing among men in SSA, this study recommends that policymakers and stakeholders step up comprehensive HIV/AIDS knowledge sensitization and education using effective tools such as mass media.

Globally, HIV/AIDS remains a public health issue, especially in sub-Saharan Africa (SSA). Despite the increased advocacy and dissemination of comprehensive HIV/AIDS information in SSA, it appears that little progress has been made to reduce the incidence of HIV/AIDS in the sub-region. This study, therefore, examined the association between comprehensive HIV/AIDS knowledge and safer sex negotiation among adolescent girls and young women in SSA. Data were taken from the Demographic and Health Surveys conducted between 2010 and 2019 in 30 countries in SSA. The study sample comprised 37,364 adolescent girls and young women aged 15–24. A multivariable binary logistic regression analysis was done to test the hypothesis that there is a positive association between comprehensive HIV/AIDS knowledge and safer sex negotiation. Adolescent girls and young women who had comprehensive knowledge on HIV/AIDS were more likely to negotiate for safer sex compared with those who had no comprehensive knowledge on HIV/AIDS (AOR=1.31, 95% CI: 1.22–1.41). At the country level, the positive association between comprehensive knowledge on HIV/AIDS and safer sex negotiation was significant in Chad, Congo DR, Gambia, Guinea, Liberia, Ethiopia and Malawi. On the other hand, in Togo, adolescent girls and young women who had comprehensive HIV/AIDS knowledge were less likely to negotiate for safer sex. These findings can inform policies and programmes on the crucial role of comprehensive HIV/AIDS education and knowledge in increasing safer sex negotiation among adolescent girls and young women in SSA. The study recommends that Togo needs to address certain practices such as intimate partner violence against adolescent girls and young women, which prevent them from negotiating for safer sex, despite their higher knowledge on comprehensive HIV/AIDS. Lessons can be learnt from Chad, Congo DR, Gambia, Guinea, Liberia, Ethiopia and Malawi about the scale-up of programmes and interventions targeted at young women.

People living with undiagnosed HIV are big contributors to the transmission of the virus. Although measures have been made to scale up HIV prevention and voluntary counselling and testing in sub-Saharan Africa, testing coverage remains low in many sub-Saharan African countries, including Mozambique and Kenya, where most people live with HIV/AIDS. Studies have shown that, in most countries in sub-Saharan Africa, men are less likely to test for HIV compared with women. This study examined the relationship between comprehensive HIV/AIDS knowledge and HIV testing among men in Kenya and Mozambique. Data were from the men’s re-code file of the Demographic and Health Surveys of Mozambique and Kenya. Binary logistic regression models were generated and the results presented as crude odds ratios (cOR) and adjusted odds ratios (aOR). The prevalences of HIV testing in Kenya and Mozambique were 80.1% and 46.7%, respectively. Men in Mozambique who had comprehensive HIV/AIDS knowledge (aOR=1.26, CI: 1.07–1.47) were more likely to test for HIV compared with their counterparts who had no comprehensive HIV/AIDS knowledge. In Kenya, men who had comprehensive HIV/AIDS knowledge (aOR=1.23, CI: 1.09–1.39) were more likely to test for HIV compared with their counterparts who had no comprehensive HIV/AIDS knowledge. This study found a statistically strong significant association between comprehensive HIV/AIDS knowledge and HIV testing among men in Kenya and Mozambique. To improve HIV testing rate among men, it is important that interventions are geared towards improving men’s comprehensive HIV/AIDS knowledge, perhaps by expanding HIV/AIDS education programmes and campaigns. This could improve HIV testing rates and ensure the realization of the global HIV/AIDS target of 95-95-95 by the year 2030.

Female genital mutilation (FGM) is very pervasive in Africa, with significant regional variations in the prevalence of this traditional practice. This study examined the linkages between FGM and multiple sexual partnership in Mali and Sierra Leone – two African countries with a high prevalence of FGM. Data were from the 2018 Mali and 2013 Sierra Leone Demographic and Health Surveys, and the study sample comprised 4750 women from Mali and 16,614 from Sierra Leone. Multilevel logistic regression was used for the data analysis, with reported adjusted odds ratios (aOR) and associated 95% confidence intervals. In Mali, women who had not undergone FGM were less likely to have multiple sexual partners (aOR=0.60, CI=0.38–0.96) compared with those who had undergone FGM. In Sierra Leone, women who had undergone FGM (aOR=1.15, CI=1.02–1.30) were more likely to have multiple sexual partners compared with those who had not undergone FGM. Age, level of education, wealth quintile, sex of household head, community socioeconomic status, mass media exposure, and community literacy level were found to be associated with the likelihood of multiple sexual partnership among women in Mali and Sierra Leone. Comprehensive, age-group-based risk-reduction strategies, such as abstinence education and decision-making skills (assertiveness) training, are needed to reduce girls’ and young women’s engagement in multiple sexual partnerships. Policy interventions, such as anti-FGM legislation and initiatives like the ‘Schooling for the Female Child’ initiative aimed at reducing social inequality among girls and women, might help decrease FGM and the likelihood of health-compromising behaviours like multiple sexual partnership.

Utilization of antenatal care (ANC) services, as part of reproductive health care, presents a lifesaving chance for health promotion and the early diagnosis and treatment of illnesses throughout pregnancy. This study examines the factors associated with the number and timing of ANC visits among married women in Cameroon using data from the 2018 Cameroon Demographic and Health Survey. The outcome variables were number of ANC visits, categorized as <8 visits or ≥8 visits, and the timing of first ANC visit, categorized as ≤3 months (early) or >3 months (late) (as per the new 2016 WHO recommendations). Descriptive statistics and binary logistic regression were used to analyse the data. Crude odds ratios (cOR) and adjusted odds ratios (aOR) and p-values with significance at <0.05 were used to interpret the results. The proportions of women who had ≥8 ANC visits and first ANC visit at ≤3 months gestation were 6.3% and 35.6% respectively. Women aged 35–39 at childbirth (aOR=3.99, 95% CI=1.30–12.23), middle wealth quintile women (aOR=3.22, 95% CI=1.01–10.27), women whose husbands had secondary (aOR=7.00, 95% CI=2.26–21.71) or higher (aOR=16.93, 95% CI=4.91–58.34) education were more likely to have ≥8 ANC visits. Early timing of first ANC visit was low among women with birth order 3–4 (aOR=0.63, 95% CI=0.46–0.85). Conversely, the likelihood of having early ANC visits was high among women whose pregnancies were intended (aOR=1.32, 95% CI=1.01–1.74), the richest women (aOR=3.89, 95% CI=2.30–6.57) and women whose husbands had secondary (aOR=2.41, 95% CI=1.70–3.64) or higher (aOR=3.12, 95% CI=2.40–7.46) education. The study highlights that age at childbirth, wealth, husband’s educational attainment, birth order and pregnancy intention could influence the utilization of ANC services among married women in Cameroon. Hence, to improve attendance and early initiation of ANC, interventions should be targeted at empowering women financially and removing all financial barriers associated with accessing ANC, improving ANC education among women and encouraging male involvement in ANC education.

In radiotherapy planning, computed tomography (CT) images are used to calculate the dose in the patient. However, a high density hip prosthesis can cause streaking artefacts in CT images, which make dose calculations for nearby organs inaccurate. This study aim to quantify the impact of a hip prosthesis on 6 MV photon beam dose distribution using the Monte Carlo (MC) simulation. To quantify the radiation dose at the hip prosthesis accurately, image processing techniques were used to generate CT images free from streak artefacts. MATLAB software was used to produce computer-generated phantoms consisting of bone, titanium, stainless steel and CoCrMo. Percentage depth dose (PDD) and beam profile were used to analyse the impact of the hip prosthesis on the dose distribution of the photon beam. PDD showed that the absorbed dose was reduced as the density of the material increased, and the dose was reduced by as much as 49% when the photon beam struck the highest density material (CoCrMo, 8·2g/cm3). However, dose was increased at the tissue-hip prosthesis interface (depths of 4 and 19cm). As the depth increased, the absorbed dose decreased due to attenuation of photons by the tissue and the metal.

Answer Set Programming (ASP) is a powerful form of declarative programming used in areas such as planning or reasoning. ASP solvers enforce stable model semantics, which rule out solutions representing certain kinds of circular reasoning. Unfortunately, current ASP solvers are incapable of solving problems involving cyclic dependencies between multiple integer or continuous quantities effectively. In this paper, we generalize the notion of stable models to bound founded variables with arbitrary domains, where bounds on such variables need to be justified by some rule in the program in order for the model to be stable. We show how to handle significantly more general rule forms where bound founded variables can act as head or body variables, and where head and body variables can be related via complex constraints subject to certain monotonicity requirements. We describe a new unfounded set detection algorithm which allows us to enforce this generalization of the stable model semantics. We also show how these unfounded sets can be explained in order to allow effective conflict-directed clause learning. The new solver merges the best features of CP, SAT and ASP solvers and allows new types of problems to be solved very efficiently.

Tigers Panthera tigris face a wide and complex array of threats. Given limited time and resources it is essential to direct conservation actions based on the relative importance of each threat. The Sundarbans Reserve Forest is the last stronghold of tigers in Bangladesh and supports one of the largest populations of tigers in the world. As in other tiger landscapes, the threats faced by the tigers have yet to be assessed. This study follows an approach developed by The Nature Conservancy to identify and prioritize threats and set a time-frame for their reduction. We identified a total of 23 threats; four were linked to tigers, two to prey and 17 to habitat. Of the identified threats, the highest ranked included poaching of tigers, poaching of prey, sea-level rise, upstream water extraction/divergence, wood collection, fishing, and harvesting of other aquatic resources. All threats were then scheduled for reduction, based on the rank and current information base for each threat and the likely time-frame for implementing potential solutions. This study demonstrates how the application of a prioritization framework can greatly improve the focus and likelihood of success of any species- or ecosystem-based conservation programme.