Two-dimensional state sum models and spin structures

The state sum models in two dimensions introduced by Fukuma, Hosono and Kawai are generalised by allowing algebraic data from a non-symmetric Frobenius algebra. Without any further data, this leads to a state sum model on the sphere. When the data is augmented with a crossing map, the partition function is defined for any oriented surface with a spin structure. An algebraic condition that is necessary for the state sum model to be sensitive to spin structure is determined. Some examples of state sum models that distinguish topologically-inequivalent spin structures are calculated.Comment: 43 pages. Mathematica script in ancillary file. v2: nomenclature of models and their properties changed, some proofs simplified, more detailed explanations. v3: extended introduction, presentational improvements; final versio

Special Education in Hartford and Cape Town: What Policies and Programs Reveal About an Educational Culture’s View of Students with Disabilities

Abstract This paper analyzes special education policy in Hartford, Connecticut and Cape Town, South Africa to see how different educational cultures view students with disabilities. The themes of teacher training, curriculum, and treatment of children in addition to language use are described and compared. Cape Town educational culture arguably has a more holistic view of students with disabilities as the policy commits to providing more resources and hiring confident and trained teachers committed to providing for the needs of their students. However, Hartford has more guidance on the treatment of children and more accepting language use in the policies. This research can be used to inform future revisions of special education policies by showing the strengths and weaknesses of the two locality’s policies in providing for the needs of the students

A Change in Fish Assemblages in the Pascagoula River, MS

The Pascagoula River in southeastern Mississippi is the largest remaining un-impounded river system in the contiguous United States and have seen a change in fish assemblages over time. Examination of long-term fish assemblage data show that the mainstem Pascagoula River and its two major tributaries (mainstem Leaf and Chickasawhay Rivers) have been dominated by five abundant taxa that comprise 83% of individuals sampled, with Cyprinella venusta in the highest abundance. Beginning in about 2005-2006, a change in the mainstem Pascagoula River (but not mainstem Leaf and Chickasawhay rivers) was seen to an alternate assemblage where five different taxa dominate (89% of assemblage), with Hybognathus nuchalis now the most abundant species. Thus, a shift in fish assemblages seems to have occurred in one portion of the drainage but not the other. A potential driver for the switch in historic versus contemporary assemblage composition could have been changes in the abiotic environment, most specifically in dissolved oxygen (DO) within the Pascagoula River. Because of the differences in tolerances to the abiotic environment, H. nuchalis may be able to utilize a broader variety of habitats compared to C. venusta and be a notable factor in the reason there is a shift in relative abundances in assemblages. Hybognathus nuchalis can withstand pools and backwaters that are lower in DO and might do better in more extreme conditions, while C. venusta is unable to tolerate the harsher environments

Evaluation of the rainfastness of selected insecticides in cotton

Rainfastness of insecticides is an understudied aspect of agricultural research. Little is known about the residual of commonly used products for key pests of cotton, as well as their residual after a rainfall event. This project was designed to evaluate the impact of rainfall on the performance of commonly used insecticides for tobacco thrips, Frankliniella fusca (Hinds); tarnished plant bug, Lygus lineolaris (Palisot de Beauvois); and bollworm, Helicoverpa zea (Boddie), management in cotton. Laboratory and field experiments suggest that rainfall occurring within 16 hours after application had a negative impact on the performance of most insecticides. Chemical analyses of leaf tissue using a mass spectrometer confirmed what was observed with field and laboratory experiments. Although direct comparisons between insecticides cannot be made, results from this study suggest that spinosyns and insect growth regulators appeared to have the longest residual after a rainfall event

Holiday Inn at the Bellingham International Airport: environmental impact assessment

The Bellingham International Airport located in Bellingham, Washington in Whatcom County, has a history dating back to 1941 and is currently owned by the Port of Bellingham. The Port of Bellingham is currently looking to expand its property and is opening up to commercial users in order to create jobs and economic growth within the community. They have a current project underway with the Hotel Services Group, LLC to implement the construction of a hotel. The main objective is to construct a Holiday Inn Brand hotel next to the Bellingham International Airport in order to provide convenient lodging for travelers. The proposed full-service hotel will have 153 rooms, a full-service restaurant, an indoor pool, 7,000 square feet of conference room space, as well as 300 stalls of underground and surface parking

Inter-step Height Variation of Stairways and Observations of Fall-related Events

INTRODUCTION: Variation in step height within a stairway could negatively impact safe stairway negotiation by decreasing step height predictability, and consequently, increasing stair users’ fall risk. Unfortunately, inter-stairway step height variability is common, particularly in older stairways, but its impact may be lessened by highlighting steps’ edges using high-contrast stripes on the top front edge of each step. Such contrast enhancement may draw greater attention to the steps’ edges and potentially enhance the precision of the edge’s estimated location. PURPOSE: To determine (1) if fall-related events are associated with greater inter-step height variation, and (2) if such fall-related events are reduced in the presence of contrast enhanced step edges compared to a control stairway. METHODS: Stair users were video recorded on two public stairways in a university building. One stairway had black vinyl strips applied to the step’s edges and black-and-white vertical stripes on the last and top steps’ faces. The stairway with striping was switched halfway through data collection. Each stair user recorded was coded for whether they experienced a fall-related event. RESULTS: Each flight of stairs had varying inter-step height (e.g., 14 mm for both West and East lower, 12 mm for the West upper, and 5 mm for the East upper). The flights that had 14 mm in inter-step height variation were associated with 80% of the fall-related events observed. 13 of 16 (81%) fall-related events occurred on the control stairway (no striping) compared to 3 of 16 (19%) on the high-contrast striping stairway. A Monte Carlo simulation was used to predict the probability of the distribution of fall-related events given our hypotheses. The distribution of fall-related events we observed between conditions likely did not occur by chance, P = 0.0358. CONCLUSION: These data support that a vision-based strategy (i.e., striping) may counteract fall-risk associated with high inter-step height variability. While the mechanisms of its action remain unclear, the high-contrast striping appears to have a positive impact on the incidence of fall-related events in the presence of high inter-step height variability

Losing Ground: Awareness of Congenital Cytomegalovirus in the United States

One in 150 infants is born with cytomegalovirus (CMV) and one in 750 will have lifelong disabilities due to CMV. Even though congenital CMV is the leading viral cause of congenital disabilities and the leading non-genetic cause of childhood hearing loss, most adults have never heard of it. Data from the 2015 and 2016 HealthStylesTM surveys were analyzed and compared to data from similar studies and show an awareness rate of 7% for US adults (5% for men and 9% for women), a statistically significant decrease from 2005 and 2010 studies. Predictors of awareness include gender and education level. The presence of a child ages 0-5 in the household does not increase the chance that an adult in the household is aware of CMV. CMV presents a large public health burden and further research needs to be focused on awareness and prevention of the negative sequela associated with congenital CMV

Comparing Preceptor and Student Perceptions on Mentoring Characteristics: An Exploratory Study

Key Points: No significant differences exist in students and preceptors perceptions of mentoring. Preceptors and students value professional and interpersonal attributes of mentorship. Gender and ethnicity were not highly rated aspects of mentorship