Health and safety: Preliminary comparative assessment of the Satellite Power System (SPS) and other energy alternatives

Data readily available from the literature were used to make an initial comparison of the health and safety risks of a fission power system with fuel reprocessing; a combined-cycle coal power system with a low-Btu gasifier and open-cycle gas turbine; a central-station, terrestrial, solar photovoltaic power system; the satellite power system; and a first-generation fusion system. The assessment approach consists of the identification of health and safety issues in each phase of the energy cycle from raw material extraction through electrical generation, waste disposal, and system deactivation; quantitative or qualitative evaluation of impact severity; and the rating of each issue with regard to known or potential impact level and level of uncertainty

Comparative health and safety assessment of the SPS and alternative electrical generation systems

A comparative analysis of health and safety risks is presented for the Satellite Power System and five alternative baseload electrical generation systems: a low-Btu coal gasification system with an open-cycle gas turbine combined with a steam topping cycle; a light water fission reactor system without fuel reprocessing; a liquid metal fast breeder fission reactor system; a central station terrestrial photovoltaic system; and a first generation fusion system with magnetic confinement. For comparison, risk from a decentralized roof-top photovoltaic system with battery storage is also evaluated. Quantified estimates of public and occupational risks within ranges of uncertainty were developed for each phase of the energy system. The potential significance of related major health and safety issues that remain unquantitied are also discussed

Teacher-Student Exchange as a Moderator of the Relationship between Core Self-Evaluations and Student Engagement in Citizenship and Counterproductive Behaviors

The purpose of the present study was to determine if core self-evaluations (CSE) could be used to predict participation in student citizenship behaviors (SCBs) and counterproductive student behaviors (CSBs). This study also introduced a new term to the literature, Teacher-Student Exchange (TSX), to describe the quality of relationships students have with professors and investigated how these interactions influence student participation in SCBs and CSBs. It was proposed that CSE would positively predict participation in SCBs and negatively predict participation in CSBs. It was also proposed that TSX would moderate the relationships between CSE and SCBs and CSE and CSBs. Participants included 105 participant and peer dyads who completed online questionnaires measuring core self-evaluation, student citizenship behaviors, counterproductive student behaviors, and teacher-student exchange. Overall, results did not support the hypotheses regarding the positive effects of CSE on student citizenship behaviors and the moderating role of TSX; however, results did indicate that CSE negatively predicted participation in counterproductive student behaviors. Participants of this study mainly included first-year college students who may not have the experiences that older students have had during college and is a limitation of the study. Future research should collect data across all college years and consider addressing populations of students who might have differing experiences at college such as non-traditional students and distance education students. Since CSE was found to predict participation in CSBs, institutions should consider evaluating students and identifying those students that might be at risk for higher participation in these negative behaviors

Kaizen approach to quality improvement and its financial implication

Purpose: This study aims to investigate the impact of kaizen practice and how it affects the quality of large manufacturing firms particularly, Kilimanjaro international leather company.Design/methodology/approach. In this study, the Plan-Do-Check-Act (PDCA) cycle technique was employed to lower the production process's defect rate. The fishbone served as a tool for support. The PDCA cycle and fishbone are two top-notch techniques that aid in reducing the number of defective parts.Findings: The defect rate decreased by 2%. Improvement in the production process was achieved.Research limitation: One large manufacturing industry is insufficient to generalize the study's primary results. This will be achieved in the future by doing additional investigations in several large manufacturing firms.Practical implication: This study will provide consultants and practitioners with a valuable understanding of how Kaizen improves the financial performance of large manufacturing industries in Tanzania.Social Implications: The majority of learning exercises carried out during kaizen projects seek to enhance social outcomes in terms of staff members' problem-solving skills and attitudes. Particularly, Kaizen coordinators are concerned with group members' understanding of continuous improvement as well as their communication and problem-solving abilities.Originality/Value: Although some studies on kaizen have been conducted, it is currently discovered that there is insufficient literature on the application and impact of the kaizen concept in large manufacturing enterprises. Based on this case study, the framework of kaizen philosophy practices is offering useful insights for leather companies, other manufacturing industries, and organizations, including the Tanzania Kaizen unit, practitioners, and academicians

Methods for the recovery of nutrients and energy from swine manure. 1. Biogas.

The recovery of nutrients from pig manure (300 l/day discharged by 100 pigs) during digestion for biogas production amounted to 1435 kg N, 350 kg P and 490 kg K per year. When spread on the 15.26 ha of land required to grow the corn and soybean for the pig ration, each hectare would receive 94 kg N, 23 kg P and 32 kg K per year. The energy value of the recovered fertilizer represents 4.4% of the total energy input of the pig production system. (Abstract retrieved from CAB Abstracts by CABI’s permission

Exact Solution of Semi-Flexible and Super-Flexible Interacting Partially Directed Walks

We provide the exact generating function for semi-flexible and super-flexible interacting partially directed walks and also analyse the solution in detail. We demonstrate that while fully flexible walks have a collapse transition that is second order and obeys tricritical scaling, once positive stiffness is introduced the collapse transition becomes first order. This confirms a recent conjecture based on numerical results. We note that the addition of an horizontal force in either case does not affect the order of the transition. In the opposite case where stiffness is discouraged by the energy potential introduced, which we denote the super-flexible case, the transition also changes, though more subtly, with the crossover exponent remaining unmoved from the neutral case but the entropic exponents changing

Methodology for the comparative assessment of the Satellite Power System (SPS) and alternative technologies

The energy systems concerned are the satellite power system, several coal technologies, geothermal energy, fission, fusion, terrestrial solar systems, and ocean thermal energy conversion. Guidelines are suggested for the characterization of these systems, side-by-side analysis, alternative futures analysis, and integration and aggregation of data. A description of the methods for assessing the technical, economic, environmental, societal, and institutional issues surrounding the development of the selected energy technologies is presented

A double bounded key identity for Goellnitz's (big) partition theorem

Given integers i,j,k,L,M, we establish a new double bounded q-series identity from which the three parameter (i,j,k) key identity of Alladi-Andrews-Gordon for Goellnitz's (big) theorem follows if L, M tend to infinity. When L = M, the identity yields a strong refinement of Goellnitz's theorem with a bound on the parts given by L. This is the first time a bounded version of Goellnitz's (big) theorem has been proved. This leads to new bounded versions of Jacobi's triple product identity for theta functions and other fundamental identities.Comment: 17 pages, to appear in Proceedings of Gainesville 1999 Conference on Symbolic Computation

Antegrade common femoral artery closure device use is associated with decreased complications.

ObjectiveAntegrade femoral artery access is often used for ipsilateral infrainguinal peripheral vascular intervention. However, the use of closure devices (CD) for antegrade access (AA) is still considered outside the instructions for use for most devices. We hypothesized that CD use for antegrade femoral access would not be associated with an increased odds of access site complications.MethodsThe Vascular Quality Initiative was queried from 2010 to 2019 for infrainguinal peripheral vascular interventions performed via femoral AA. Patients who had a cutdown or multiple access sites were excluded. Cases were then stratified into whether a CD was used or not. Hierarchical multivariable logistic regressions controlling for hospital-level variation were used to examine the independent association between CD use and access site complications. A sensitivity analysis using coarsened exact matching was performed using factors different between treatment groups to reduce imbalance between the groups.ResultsOverall, 11,562 cases were identified and 5693 (49.2%) used a CD. Patients treated with a CD were less likely to be white (74.1% vs 75.2%), have coronary artery disease (29.7% vs 33.4%), use aspirin (68.7% vs 72.4%), and have heparin reversal with protamine (15.5% vs 25.6%; all P < .05). CD patients were more likely to be obese (31.6% vs 27.0%), have an elective operation (82.6% vs 80.1%), ultrasound-guided access (75.5% vs 60.6%), and a larger access sheath (6.0 ± 1.0 F vs 5.5 ± 1.0 F; P < .05 for all). CD cases were less likely to develop any access site hematoma (2.55% vs 3.53%; P < .01) or a hematoma requiring reintervention (0.63% vs 1.26%; P < .01) and had no difference in access site stenosis or occlusion (0.30% vs 0.22%; P = .47) compared with no CD. On multivariable analysis, CD cases had significantly decreased odds of developing any access site hematoma (odds ratio, 0.75; 95% confidence interval, 0.59-0.95) and a hematoma requiring intervention (odds ratio, 0.56; 95% confidence interval, 0.38-0.81). A sensitivity analysis after coarsened exact matching confirmed these findings.ConclusionsIn this nationally representative sample, CD use for AA was associated with a lower odds of hematoma in selected patients. Extending the instructions for use indications for CDs to include femoral AA may decrease the incidence of access site complications, patient exposure to reintervention, and costs to the health care system