Reactions of Unsaturated Hydrocarbons Over Supported Metal Carbonyl Catalysts

An investigation has been carried out on the effect of supporting metal carbonyl complexes in a highly dispersed state on an "inert" carrier. A study of the catalytic activity of these complexes in the heterogeneous phase has also been carried out. The metal carbonyls which have been examined are Os3(CO)12 and Re2(CO)10, both of which retain their molecular structure when supported on silica, and the tetranuclear mixed-metal carbonyl Rh2Co2(CO)12 which has been found to be less stable when supported, undergoing the loss of bridging carbonyl groups. Whereas the former carbonyls are very stable on exposure to air, the latter complex shows a tendency to decompose to the metals after only a short time. By the use of various techniques including T. V. A. , T. G. A. , infrared analysis and electron microscopy it has been found possible to monitor the change in structure and loss of carbon monoxide which occurs when the supported complex is thermally activated in vacuo. Hence the supported complex may be characterised at various stages in the activation process. From the studies which have been carried out using the three supported complexes it has been found that a prerequisite for catalytic activity as measured by the hydrogenation and isomerisation of the n-butenes, is the loss of at least some of the carbonyl ligands on the complex. In the case of Os3(CO)12 supported on silica, the active forms of the catalyst examined are (a) Os3(CO)g and (b) a very high . dispersion of osmium atoms, obtained after the loss of all carbonyls from the complex, in which there may or may not be cluster retention. Comparisons between this latter catalyst and a more conventional supported osmium catalyst prepared by impregnation of osmium chloride followed by reduction at 32

Natural populations of Mus musculus variability in response to warfarin in blood clotting times and reproductive patterns.

Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.Sc.)--University of Windsor (Canada), 1979

An Exploratory Evaluation of a Community Interactive Training Programme for Parents of Children Aged Birth to Five.

Background: Conduct problems (CPs), a persistent pattern of challenging, oppositional, defiant or aggressive behaviour are a significant concern to educators, families and other professionals. CPs in preschool children are related to poorer educational and social outcomes in addition to a range of behavioural and emotional difficulties. Although there is evidence for hereditary and temperamental influences, parental factors are widely considered to be significant in the development of CPs. Parents experiencing psychological or social distress are considered to be at risk for challenging behaviour in their children. Psychologists and other theorists have suggested several possible reasons for this association. Firstly, it is possible that parents in distress have difficulty managing stress and as a result use harsh, inconsistent or coercive approaches to parenting. Secondly, parents with children who have CPs may be low in parental self efficacy, a consistent belief in their capacity to parent, which leads them to parent ineffectively and inconsistently. A third possibility is that parents in distress struggle to form stable attachments with their children which can lead to later behavioural difficulties. Finally, it is possible that parent’s distress is influenced by external contextual factors which also influence children such as family or social conflict. Studies suggest that training programmes for the parents of preschool children are effective in reducing child behaviour problems. Training approaches are influenced by a combination of psychological theories including behaviourist, social-cognitive, attachment and ecosystemic approaches. There have been many quantitative evaluations supporting the use of parent training programmes (PTPs). However, there has been limited inquiry into the process of PTPs from the perspective of those who attend them. Aims: The first part of this study was designed to evaluate vulnerability factors related to conduct problems; parental self efficacy, stress and child behaviour problems over the course of a community parent training programme designed to help participants to understand and manage the behaviour of young children. The overall research aim was to evaluate the outcomes and process, using different methodologies to address several questions. A realist methodology was applied to evaluating: 1. was there an association between parental stress, parental self efficacy and child behaviour problems at the start of the programme consistent with the established theory? 2. Did the parents attending the course experience higher than expected levels of stress and child behaviour problems? 3. Did quantitative and qualitative data indicate that these vulnerability factors changed over the duration of the course? Finally, an interpretivist methodology was used to explore how parents of young children evaluated as at risk of challenging behaviour described the experience of learning in the programme. Methods: The study utilised a pragmatic approach to evaluation with mixed methods and differing methodologies. At the start of the programme, a cohort of 38 parents agreed to participate in the study prior to the programme and completed self report measures related to parental stress and parental self efficacy. Parents with concerns about the behaviour of a child aged over three also completed a questionnaire relating to child behaviour problems. Of the original cohort, 27 completed self report measures at the end of the programme. 17 parents completed the same measures at a follow up meeting at the Children’s Centre, five to six weeks after the programme was completed. At this meeting 16 parents were interviewed to discuss their experience of the programme and any subsequent changes which had occurred. Results The results of the first part of the evaluation suggested a significant relationship between parental self-efficacy and stress and between stress and child behaviour problems. However, there was no statistical association between self-efficacy and child behaviour problems, as expected. This tentatively indicates that parental self-efficacy is less important in the development of child behaviour problems than has been previously suggested. The analysis of stress data at the start of the programme indicated that the frequency of parents reporting moderate to extremely severe stress was 4.42 times that which would be expected in a typical British cohort. At the start of the programme, frequency of child behaviour problems in the cohort were 5.9 times higher with conduct problems being 9 times what would be expected based on British norms. This suggests that the programme is being accessed by parents whose children are evidencing behaviour problems and, in particular, conduct problems. However, methodological issues are likely to have led to a slight overestimate of relative prevalence of child CPs in the cohort. Results indicated that parents reported significantly increased self efficacy, significantly reduced stress and child behaviour problems, including conduct problems, between the start and end of the programme. Thematic analysis and subsequent content analysis of outcome themes from interviews suggested that the majority of parents interviewed identified changes in parenting behaviour, knowledge, confidence, reduced stress and improved child behaviour as outcomes from the programme. However, changes in the quantitative data were not observed as frequently, reliably or to the same extent in the interview subgroup as they were in the main cohort, suggesting a sampling bias or a discrepancy in findings between methods. The self report data and interviews for all interviewees were then reviewed and interviews with six parents evaluated as having moderate to high stress, social or psychological difficulties and possible child behaviour problems were sampled. These were then re-analysed using a rigorous inductive approach to Thematic Analysis to identify emergent themes relating to the experience of participating and learning through the programme. Six themes emerged from analysis including; Understanding Difficulties, Identifying and Connecting, New Knowledge, Stopping and Thinking, Approach and Interaction and Reconstructing. The Understanding Difficulties theme described the different ways in which parents understood of their difficulties relating to themselves, their children and others which motivated them to attend the programme. The Identifying and Connecting theme described the importance to parents of personal identification with several aspects of the programme in terms of “being understood” in addition to identifying connections with established support, learning objectives and personal development goals. New Knowledge was categorised into three sub-themes of theoretical, practical and contextual. Contextual knowledge was constructed as understanding the experience of other parents, for example, identifying that other parents had similar difficulties. Theoretical knowledge about child behaviour and development encouraged parents to “stop and think” about the reasons for their children’s behaviour. Practical knowledge was constructed as parenting strategies which, when used, helped parents to feel more confident in themselves, more relaxed and more in control. The Stopping and Thinking theme described parents withholding action and considering the motivations for their children’s behaviour or the best approach to interacting with them. Approach and Interaction described changes to the way parents interacted with their children. The parents in question described changed or reconstructed understandings of their children, themselves and their difficulties as a result of participating in the programme. The theoretical implications of analysing the learning experience are that it highlights the importance of personal identification with the course objectives and experience. Moreover, results confirm previous authors’ conclusions that individual reflection and new understandings are important aspects of parental learning. Implications for practice with vulnerable parents include the importance of programmes being appropriately supported, relevant to parent’s needs and delivered in an appropriate context or through services with which they have established connections. The use by practitioners of approaches to support reflective parenting may also be helpful in supporting better outcomes for parents considered at risk for child behavioural difficulties

An Analytical, Critical And Comparative Study Of Anglican Mission In The Dioceses Of Nakuru And Mount Kenya East, Kenya, From 1975.

Distinctive and common approaches in the local mission theologies of the Anglican dioceses of Nakuru and Mount Kenya East/Kirinyaga, Kenya during the period from 1975 are compared with other Protestant forms and Roman Catholicism, Pentecostal-type churches and African Instituted Churches. Specific analysis of Anglican liturgy reveals that issues of social justice and political concern have had a major impact on liturgical development and pinpoint the link between mission and worship. The mission of the Anglican Church in Kenya was at its inception Evangelical but has acquired a Catholic emphasis which has affected the use of liturgy. Appropriate theories from Anglican mission and sociology highlight aspects of recent Kenyan history (e.g. independence, decolonialization, ethnic identity, land disputes, development) which influence the course of the CPK (Church of the Province of Kenya) in the areas of Kirinyaga and Nakuru dioceses. The distinctive expression of the East African Revival Movement (Balokole) constitutes areas of commonality in mission theology between Anglicans, Methodists and Presbyterians in the diocesan areas. Anglican distinctiveness is also evident in training contexts and expressed in church leadership and communities by means of the theory and practice of wholistic mission and catechetics in relation to urban and rural cultures. It is argued that a study of the sociology and history of worship aids an understanding of a Kenyan Anglican theory of the church in mission. Various views are critiqued in focusing on the relationship between mission and liturgy. Correlations between the history of liturgical renewal, mission history, and between liturgy and sociology and secularity are examined. These demonstrate the originality of Kenyan Anglican wholistic mission through liturgy. A practical analysis of processes of liturgical change in the CPK, and other churches (using case studies) signals the extent to which the theory and practice of contextualised African Anglican liturgies in the diocesan areas have become indices of the formation of distinctive ecclesiological communities in mission. Therefore the CPK is distinctive in mission among the churches of Kenya through a unique combination of theology, training, ecclesiology, and culture-sensitive liturgy

A Born-Oppenheimer photolysis model of N_2O fractionation

The isotopically light N_2O produced by microbial activity is thought to be balanced by the return of heavy stratospheric nitrous oxide. The Yung and Miller [1997] method that first explained these trends yields photolytic fractionation factors ∼half those observed by experiment or predicted quantum mechanically, however. To address these issues, we present here a Born-Oppenheimer photolysis model that uses only commonly available spectroscopic data. The predicted fractionations quantitatively reproduce laboratory data, and have been incorporated into zonally averaged atmospheric simulations. Like McLinden et al. [2003] , who employ a three-dimensional chemical transport model with cross sections scaled to match laboratory data, we find excellent agreement between predictions and stratospheric measurements; additional processes that contribute to the mass independent anomaly in N_2O can only account for a fraction of its global budget

Switches and mortar in the Internet's shadow : a study of the effects of technology on competitive strategy for the Internet's landlords

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2000.Includes bibliographical references (leaves 132-138).Communications technology has experienced a period of explosive growth, driven by a confluence of legal, political and technical factors including the following: the 1968 Carter Phone and 1980's competitive carrier decisions, the 1984 divestiture of AT&T, the Telecommunications Act of 1996, the development and standardization of new technologies, and the proliferation of the Internet and World Wide Web. This thesis asks the fundamental questions: How has the rapid growth of the Internet and other communications technologies changed the competitive strategy of commercial tenants, and how have these changes affected commercial real estate developers? This study proposes that developers and landlords need to use more forward-looking theories of competitive strategy in order to understand the current and future real estate needs of technology-driven commercial tenants. Telecommunications deregulation and the growth of the Internet led to the creation of a new and rapidly growing high technology industry and commercial tenancy. Deregulation and the Internet also transformed the way traditional commercial real estate uses information technology, encouraged the forging of partnerships between commercial real estate professionals and "last mile" information technology contractors, and resulted in the creation of a new commercial real estate product-the telecom hotel.' Current literature suggests traditional commercial tenants might differ from Internet-based business tenants in four general areas of the development process: feasibility, site selection, design and building operations. The proliferation of the Internet as a catalyst for new real estate products, commercial tenants and partnerships, and the observed differences in development practices between traditional and commercial tenants are both clues to fundamental differences between these two tenants' competitive strategies. It is possible to understand these clues to tenant behavior by taking an in-depth look at how these two tenants compete in their respective industries. Traditional commercial business tenants appear to conform to Michael Porter's theories on competitive strategy and advantage. High-tech tenant's competitive strategies seem to be more accurately reflected by Gary Hamel and C.K. Prahalad's model of competition for the future. These two theories, and the industries they represent, differ in four dimensions: Future versus Past/Present orientation, technology use, rate of growth, and resource use. In comparing three case studies on these four strategic dimensions, this thesis concludes that Porter's more stable, efficiency-oriented model does explain the strategy of Northwestern Mutual, a large insurance organization. Hamel and Prahalad's model better explains the hectic, high growth, future orientation of Akamai and YankeeTek Incubator as well as Teleplace, a telecom hotel service company. Hamel and Prahalad and Porter's frameworks explain significant discrepancies between predicted development practices based on current industry thinking, and observed development practices based on these in depth case studies. This thesis thus verifies a need by real estate developers and landlords to use forward-looking theories of competitive strategy when examining the current and future needs of hightech tenants.by Geoffrey Morgan and Benjamin V.A. Pettigrew.S.M

Health impacts of pesticide exposure in a cohort of outdoor workers.

We compared mortality of 1,999 outdoor staff working as part of an insecticide application program during 1935-1996 with that of 1,984 outdoor workers not occupationally exposed to insecticides, and with the Australian population. Surviving subjects also completed a morbidity questionnaire. Mortality was significantly higher in both exposed and control subjects compared with the Australian population. The major cause was mortality from smoking-related diseases. Mortality was also significantly increased in exposed subjects for a number of conditions that do not appear to be the result of smoking patterns. Compared with the general Australian population, mortality over the total study period was increased for asthma [standardized mortality ratio (SMR) = 3.45; 95% confidence interval (CI), 1.39-7.10] and for diabetes (SMR = 3.57; 95% CI, 1.16-8.32 for subjects working < 5 years). Mortality from pancreatic cancer was more frequent in subjects exposed to 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (SMR = 5.27; 95% CI, 1.09-15.40 for subjects working < 3 years). Compared with the control population, mortality from leukemia was increased in subjects working with more modern chemicals (standardized incidence ratio = 20.90; 95% CI, 1.54-284.41 for myeloid leukemia in the highest exposure group). There was also an increase in self-reported chronic illness and asthma, and lower neuropsychologic functioning scores among surviving exposed subjects when compared with controls. Diabetes was reported more commonly by subjects reporting occupational use of herbicides. These findings lend weight to other studies suggesting an association between adverse health effects and exposure to pesticides

The impact of heat on mortality and morbidity in the Greater Metropolitan Sydney Region: A case crossover analysis

Background: This study examined the association between unusually high temperature and daily mortality (1997-2007) and hospital admissions (1997-2010) in the Sydney Greater Metropolitan Region (GMR) to assist in the development of targeted health program

Marketing Iowa cantaloupes

Cantaloupe production is well adapted to the sand land areas. This type of soil, though not well adapted to corn and general farm crops, may be advantageously devoted to cantaloupe growing. Cantaloupe marketing in Iowa presents a number of interesting and complex problems. These include consideration of varietal adaptation, the temperature factor, changes in transporting and selling agencies and competing areas of production. The objective of this bulletin is to show clearly what these problems are and to suggest possible methods of meeting them

Evaluation of interventions to reduce air pollution from biomass smoke on mortality in Launceston, Australia: Retrospective analysis of daily mortality, 1994-2007

Objective To assess the effect of reductions in air pollution from biomass smoke on daily mortality. Design Age stratified time series analysis of daily mortality with Poisson regression models adjusted for the effects of temperature, humidity, day of week, respiratory epidemics, and secular mortality trends, applied to an intervention and control community. Setting Central Launceston, Australia, a town in which coordinated strategies were implemented to reduce pollution from wood smoke and central Hobart, a comparable city in which there were no specific air quality interventions. Participants 67 000 residents of central Launceston and 148 000 residents of central Hobart (at 2001 census). Interventions Community education campaigns, enforcement of environmental regulations, and a wood heater replacement programme to reduce ambient pollution from residential wood stoves started in the winter of 2001. Main outcome measures Changes in daily all cause, cardiovascular, and respiratory mortality during the 6.5 year periods before and after June 2001 in Launceston and Hobart. Results Mean daily wintertime concentration of PM(10) (particulate matter with particle size <10 µm diameter) fell from 44 µg/m(3) during 1994-2000 to 27 µg/m(3) during 2001-07 in Launceston. The period of improved air quality was associated with small non-significant reductions in annual mortality. In males the observed reductions in annual mortality were larger and significant for all cause (−11.4%, 95% confidence interval −19.2% to −2.9%; P=0.01), cardiovascular (−17.9%, −30.6% to −2.8%; P=0.02), and respiratory (−22.8%, −40.6% to 0.3%; P=0.05) mortality. In wintertime reductions in cardiovascular (−19.6%, −36.3% to 1.5%; P=0.06) and respiratory (−27.9%, −49.5% to 3.1%; P=0.07) mortality were of borderline significance (males and females combined). There were no significant changes in mortality in the control city of Hobart. Conclusions Decreased air pollution from ambient biomass smoke was associated with reduced annual mortality in males and with reduced cardiovascular and respiratory mortality during winter months