Laterites and paleoclimates. Weathering processes and anthropogenic impact

The European Union of Geosciences held its 9th biannual meeting in Strasbourg, March 23–27, 1997. During this meeting, Symposium No. 63, Weathering Processes: Mineral deposits and soil formation in tropical enÍironments, was merged with Symposium No. 78, Anthropogenic Impact on Weathering processesco-sponsored by IGCP Project 405. The resulting symposium No. 63, Weathering processes and Anthropogenic Impact, was held under the sponsorship of EUROLAT1 and attracted 36 oral and poster presentations and about 100 participants, reflecting the interest of the Earth Sciences community in weathering processes and anthropogenic impact

Schelling segregation in an open city: a kinetically constrained Blume-Emery-Griffiths spin-1 system

In the 70's Schelling introduced a multi-agent model to describe the segregation dynamics that may occur with individuals having only weak preferences for 'similar' neighbors. Recently variants of this model have been discussed, in particular, with emphasis on the links with statistical physics models. Whereas these models consider a fixed number of agents moving on a lattice, here we present a version allowing for exchanges with an external reservoir of agents. The density of agents is controlled by a parameter which can be viewed as measuring the attractiveness of the city-lattice. This model is directly related to the zero-temperature dynamics of the Blume-Emery-Griffiths (BEG) spin-1 model, with kinetic constraints. With a varying vacancy density, the dynamics with agents making deterministic decisions leads to a new variety of "phases" whose main features are the characteristics of the interfaces between clusters of agents of different types. The domains of existence of each type of interface are obtained analytically as well as numerically. These interfaces may completely isolate the agents leading to another type of segregation as compared to what is observed in the original Schelling model, and we discuss its possible socio-economic correlates.Comment: 10 pages, 7 figures, final version accepted for publication in PR

A hybrid CA-PDE Model of chlamydia trachomatis infection in the female genital tract

Chlamydia trachomatis is amongst the most common sexually transmitted diseases in the world and when left untreated, may lead to serious sequelae particularly in women such as pelvic inflammatory disease, ectopic pregnancy and infertility. Currently, most mathematical modelling in the literature regarding Chlamydia is based on time dependent differential equations. The serious pathology associated with C. trachomatis occurs when the chlamydial infection ascends to the upper genital tract. But no modelling study has investigated the important spatial aspects of the disease. In this work, we include spatiotemporal considerations of the progression of chlamydial infection in the genital tract. This novel direction is achieved using cellular automata modelling with probabilistic decision processes. In this presentation, the modelling strategy will be described, as well as its relationship with existing models and the advances in understanding that are achieved with such a model. Such an approach provides valuable insights into disease progression and will lead to experimentally testable predictions and a basis for further investigation in this area

Narratives of resistance: (Re) Telling the story of the HIV/AIDS movement – Because the lives and legacies of Black, Indigenous, and People of Colour communities depend on it

Centering the narratives of the intersectional struggles within the HIV movement for Indigenous sovereignty, Black and People of Colour liberation, and LGBTQ rights tirelessly fought for by Black, Indigenous, and People of Colour communities legitimates their lives and legacies within the movement; and the relevance of a focused response to the HIV epidemic that continues to wreak devastation in these communities. The recent political push for a post-HIV era solely centers the realities of middle-class white, gay men and has genocidal implications for Black, Indigenous, and People of Colour communities

Effects of a Systematic-Motor Reinforcement Experience on Alphabet Letter Discrimination Tasks by Preschool Children

The purpose of this study was to determine if an experimental group of children would make significant improvements in their ability to discriminate and order alphabet letters after a systematic reinforcement program of sensorimotor experiences with letters. The study involved tactual manipulation in learning the discrimination of, the order of, and the position of the alphabet letters in the child\u27s own name. The hypotheses were made: l. There will be a significant difference between the experimental population and the control population with respect to the ability to order and place in sequence the letters in each child\u27s name , after the completion of a systematic program of sensori-motor experience. 2. There will be a significant difference between the experimen tal population and the control population with respect to visual-perceptual discrimination, or positioning, after the completion of a systematic program of sensori-experience. Twenty four children , 12 in an experimental group , 12 in a control group, six boys and six girls , between the ages of three years and six months and four years and six months were selected at random from the Utah State University Laboratories. Preceeding the actual collection of data a pilot study was conducted on a similar group of 12 children using the proposed pretest. During the free-play in the Laboratory , each child was asked to go with the author to play a game. The first time with the author , and prior to the pretest , the child was given a brightly colored stacking cone to manipulate for the purpose of establishing rapport and self-confidence within the child. Each child in the experimental and control groups was given a pretest to test the ability to discriminate and order letters from in !heir own first name . The experimental group received a systematic sensori-motor experience twice a week dealing with letter discrimination. The control group received no experience in letter manipulation after the pretest. Each child set his own pace and was given the post-test only when he stated he was ready. At the time the majority of the experimental group was receiving their post-test the control group received theirs. The findings support both hypotheses with the difference of the experimental group and the control group showing significance at the . 05 level for hypothesis one and between . 05-. 01 level for hypothesis two

An Analysis of the Vocational Development of Successful Career Women of Northeast Kentucky

A report submitted by Jean Wilson to the Faculty Research Committee on the development of successful career women in Northeast Kentucky on May 5, 1981

A Transcendental Phenomenological Investigation of Novice Teachers\u27 Experiences with Parental Involvement in Title I Elementary Schools

The purpose of this transcendental phenomenological study was to describe novice teachers’ experiences with parental involvement in Title I elementary schools in southern Virginia. Parental involvement was defined as parents actively engaging in their child’s education, critically important to academic development. Kolb’s (2015) experiential learning theory was the theoretical framework for this study. The significance of this study investigated novice teachers, those with five or fewer years’ teaching background, and their experiences with parental involvement in Title I elementary schools. In doing so, 14 novice teachers from Title I elementary schools in southern Virginia, were chosen to participate. Interviews, individual and focus group, as well as writing prompts, were used to collect data. This study attempted to answer the central research question: How do novice teachers describe their experience with parental involvement in Title I elementary schools in southern Virginia? This study also attempted to answer sub-questions: (a) What role do novice teachers perceive Title I elementary schools to have when engaging parents in family-school relationships? (b) How do novice teachers in Title I elementary schools describe prior experiences in teacher-preparation programs when training for building family-school relationships? (c) What successful academic and social experiences can novice teachers describe with students in Title I elementary schools when parents are home- and/or school-base involved? and (d) What do novice teachers perceive as academic challenges with students when observing a lack of home- and/or school-based parental involvement in Title I elementary schools? Data analysis used Moustakas’ (1994) step-by-step method, to provide a rich description of novice teachers’ experiences

Effects of mathematics and science student performance in a single-sex learning environment

Gender differences in mathematics learning continue to attract much research attention. A guarded enthusiasm is growing for single-sex mathematics classes as an intervention strategy designed to redress past inequities and create fairer learning environments for girls. This investigation was undertaken in response to a specific request from an elementary, independent, coeducational day school in Miami, Florida, as an exploratory study to address the gender differences in the participation and achievement of girls in mathematics and science. The purpose of the investigation was to study the effects of mathematics and science student performance in single-sex classes;The participants in the study consisted of all the students enrolled in the school\u27s fifth grade class. The study used a quasi-experimental, single-group (pretest/posttest) design. The following instruments were utilized to measure academic growth and student performance: (1) criterion-referenced mathematics and science examinations (pretest/posttest assessments aligned with the respective state\u27s grade level curriculum), (2) standardized mathematics and science achievement tests, and (3) year-end mathematics and science report card grades. The literature reviewed for this investigation identified numerous attribution variables which influence students\u27 perceptions of their own achievement, benefits, and attitudes toward the study of mathematics and science. A Student Response Inventory was designed to examine gender differences in student opinion data relating to five categories of attribution variables. Performance data were analyzed using t-tests for dependent and independent groups and analyses of covariance (ANCOVA). Student opinion data were examined through tables of response frequencies;The findings support that instructing students in single-sex classrooms for mathematics and science does increase the likelihood of similar performance by both genders. Only two of the analyses indicated statistically significant differences between genders: (1) girls demonstrated stronger academic growth between the administration of the pretest/posttest criterion-referenced examinations in science than the boys and (2) when statistically controlling for previous mathematics and science achievement, the adjusted mean GPA scores for the girls were raised in both mathematics and science and lowered for the boys in both subject areas. Overall, results indicate that single-sex instruction in mathematics and science does tend to benefit students, especially girls

Here on this hill

Jolee Wilese is a young college student struggling to reconcile her life experiences in two different worlds: the world of a college community in the city of Babel, to which she commutes daily, and the world of her home community in a rural area of northern Mississippi. Past and present collide as she explores events and ideologies which have shaped her own identity and the identities of those around her, particularly her father who works in the city, farms at home, struggles with alcoholism and fears the nearness of an apocalyptic era. As the story unfolds, Jolee finds herself torn between two opposing worldviews--the worldview embodied by her home and community, and the worldview she finds herself immersed in as she works and attends school in town. Through a series of events both within and outside of her control, she faces a decision that may alter the course of her life