An investigation into the images of the Virgin Mary held by select Anglican women clerics in KwaZulu-Natal, South Africa, with respect to selected historical developments in Mariology.

Thesis (M.A.)-University of KwaZulu-Natal, Pietermaritzburg, 2012.This exploratory study examines the question of Mariology in the Anglican Church in KwaZulu-Natal, South Africa. It focuses on how Anglican women priests relate to the Virgin Mary within the patriarchal structures and African context of the Anglican Diocese of Natal. It aims to ascertain the perceptions of the Virgin Mary held by a sample group of ordained, doctrinally informed, Anglican women. The premise is that because the Anglican Church is closer to Roman Catholicism than other Protestant churches, these clerics might be more open to the dogmas of Mariology as proclaimed by the Magisterium of the Roman Catholic Church. The depths of the subjects‘ knowledge of Marian dogma are ascertained, as well as the extent to which their spirituality and devotions are affected by this. An attempt is made to establish the potential advantages of an enhanced Marian presence in The Anglican Church in KwaZulu-Natal, South Africa. This study is intended not merely to establish the dogmatic similarities in the Anglican and Roman Catholic traditions and underscore those issues which inhibit Marian veneration among local ordained Anglican women. Its intention is to elicit the effects of dogma on spirituality and worship, and to discern whether the subjects feel an affinity with Catholic Marian dogma and see any possibility of ecumenical progress between the two Churches. Roman Catholic Marian dogma is elucidated and examined. The four main dogmas are presented: the Theotokos, her Perpetual Virginity, her Immaculate Conception and her Assumption into Heaven. The Protestant and Anglican reservations regarding these dogmas are examined, and ecumenical dialogue between the Roman Catholic Church and Protestant Churches is discussed, including the bilateral ARCIC discussions with the Anglican Communion. Nine Anglican priests are interviewed, and the data and its implications for Anglican-Roman Catholic ecumenism are examined. The findings indicate that the subjects do not subscribe to Roman Catholic dogma and praxis on Mary. It is proposed that Marian dogma per se is not a hindrance to ecumenism, but the fact of the dogmas reflecting the teachings on more fundamental theological issues such as the nature of sacraments, the trinity, the nature of grace and eschatology in the Anglican and Roman Catholic Churches

Accurate prediction of sugarcane yield using a random forest algorithm

International audienceAbstractForeknowledge about sugarcane crop size can help industry members make more informed decisions. There exists many different combinations of climate variables, seasonal climate prediction indices, and crop model outputs that could prove useful in explaining sugarcane crop size. A data mining method like random forests can cope with generating a prediction model when the search space of predictor variables is large. Research that has investigated the accuracy of random forests to explain annual variation in sugarcane productivity and the suitability of predictor variables generated from crop models coupled with observed climate and seasonal climate prediction indices is limited. Simulated biomass from the APSIM (Agricultural Production Systems sIMulator) sugarcane crop model, seasonal climate prediction indices and observed rainfall, maximum and minimum temperature, and radiation were supplied as inputs to a random forest classifier and a random forest regression model to explain annual variation in regional sugarcane yields at Tully, in northeastern Australia. Prediction models were generated on 1 September in the year before harvest, and then on 1 January and 1 March in the year of harvest, which typically runs from June to November. Our results indicated that in 86.36 % of years, it was possible to determine as early as September in the year before harvest if production would be above the median. This accuracy improved to 95.45 % by January in the year of harvest. The R-squared of the random forest regression model gradually improved from 66.76 to 79.21 % from September in the year before harvest through to March in the same year of harvest. All three sets of variables—(i) simulated biomass indices, (ii) observed climate, and (iii) seasonal climate prediction indices—were typically featured in the models at various stages. Better crop predictions allows farmers to improve their nitrogen management to meet the demands of the new crop, mill managers could better plan the mill’s labor requirements and maintenance scheduling activities, and marketers can more confidently manage the forward sale and storage of the crop. Hence, accurate yield forecasts can improve industry sustainability by delivering better environmental and economic outcomes

New APSIM-Sugar features and parameters required to account for high sugarcane yields in tropical environments

Sugarcane in field plot experiments in tropical Brazil (Guadalupe, Piaui State, 6.6 degrees S), produced very high yields under non-limiting water and nutrients. Mean stalk dry mass at 8, 11.5 and 15 months were 40, 51 and 70 t/ha respectively for six varieties and six planting dates. These yields were explained by high but not excessive temperatures allowing the canopy to close after 73 days on average. Substantial changes were required to enable the APSIM-Sugar model to simulate canopy and yield gain processes in Brazilian genotypes for the purpose of optimising variety, planting and harvest date options. A new modelling feature was proposed to deal with the observed growth slowdown when crop was about 7-8 months old and dry mass yields higher than 40 t/ha. All new parameters and features were validated with independent experiments as well as with the original dataset used for developing APSIM-Sugar. Future studies involving irrigation, yield gap analysis and climate change in environments where high yields are expected, should consider these modifications