In northeast Brazil grazing is a major use of much of the semiarid woodlands (caatinga). Animal production is limited by lack of dry season forage, primarily deciduous tree leaves. Management is constrained by the persistence of undesirable trees that sprout from the stump (coppice). This study evaluates the possibility of manipulating coppicing trees to improve caatinga management, particularly dry season forage production. The season of cutting can influence coppicing. Trees were cut early and late in the wet and dry seasons. After two years, trees of all species cut in the late wet season produced less biomass than those cut in other seasons. Production of most species was maximized by cutting in the dry season. Desirable species should be cut during the dry season to maximize production and less desirable ones in the late rainy season to reduce coppicing. Seasonal cutting does not cause mortality, nor can it cause any prolonged change in the leaf: stem ratio. Another study quantifies the response to defoliation of coppice growth by goat browsing or manual removal. The palatable browse species sabia and catingueira suffered no mortality while less palatable species experienced significant mortality. One year after defoliation, defoliated trees still produced less biomass than non-defoliated trees. Browsed stumps sprouted again during the dry season. Changes in the abscission phenology of coppice growth were observed. Coppice growth retained leaves from 2 to 12 weeks longer than intact trees of the same species. Regrowth on browsed stumps remained green for the duration of the S month dry season. Delaying abscission regulates the availability of dry season forage, and has implications for animal production that merit further investigation. Coppice growth can be manipulated to change the species composition of the regenerating stand, improve seasonal forage balance, and reduce site disturbance. Changing from even-aged to uneven-aged management might facilitate these changes. Prospects for improving wood production are better than animal production because of the limits imposed by mixed production systems, land tenure, and human population growth.

Growth and enterotoxin production by Staphylococcus aureus straings, in the presence of different starter [2:1 (V/V) blend of AM2:ML8 strains of Streptococcus lactis] levels was investigated. Sterile, 10 per cent non-fat dry milk was inoculated with S. aureus strains capable of producing all types of enterotoxins, and reduced levels of starters; and was incubated at 32 C for 24 hours. The pH and S. aureus population were determined at 2 hour intervals until 8 hours and at 24 hours. The inhibitory response of lactic streptococci was studied by spot-tests on a lawn of S. aureus strains. The drop in pH, from 4 to 8 hours incubation, for all starter levels, was proportional to their inocula. The rate of acid formation, or drop in pH, from 4 to 8 hours, was correlated with the change in staphylococcal population from 6 to 24 hours (Correlation Coefficient = Y = -0.805). Regression analysis indicated that change in pH from 4 to 8 hours could be used to predict the staphylococcal population change from 6 to 24 hours. All four enterotoxigenic strains showed differential susceptibility to the starter metabolite(s). A 0.1 per cent starter level did not allow the increase of approximately 104 cells per milliliter, of an eterotoxin D producing strain of S. aureus (23235). Approximately 106 cells per milliliter of S. aureus 23235, decreased to about 104 cells in the presence of a 0.1 per cent starter level; while 0.01 per cent starter level did not allow the inocula of approximately 106 cells pe milliliter, of enterotoxin B producing strain of S. aureus, did not increase in the presence of 0.01 per cent starter level. The same inocula of enterotoxin A and C producing straings of S. aureus decreased to about 103 to 104 cells per milliliter in the presence of 0.01 per cent starter. These strains sharply declined in population in the presence of 0.1 per cent starter level. The lactic organism did not produce inhibitory levels nisin, or over 5 micrograms of hydrogen peroxide per milliliter of broth. When the lactic streptococci were spotted on lawns of enterotoxins B, C, and D producing strains of S. aureus, staphylococcal grothwas inhibited around the spots, on both agar, with and without added calcium carbonate. Enterotoxin A producing strain was not inhibited on agar. The degree of inhibition for B and D enterotoxin producing strains, was greater in agar fortified with calcium carbonate, than that without fortification while the revers was true for enterotoxin C producing strain.

Research into the polyculture of finfish and crayfish has been conducted in Western Australia for over a decade now. This research was instigated out of a need to increase revenues from freshwater crayfish farmers wishing to diversify their income base with a view to increasing profitability and reducing risk. It has become clear that several key variables dictate how the polyculture system (i.e. polysystem) will perform. These include biological factors like: size of participating species, relative densities, gender, planktonic turbidity, natural feeds; and abiotic factors like: light intensity, clay turbidity, floating cages for segregation, water quality, and habitat/shelter complexity. Many of these factors can be controlled / adjusted by the manager of the polysystem to maximise performance, production and profitability.While much of the research to date has focussed on the marron (Cherax tenuimanus) industry, it is also important to realise that an understanding of these factors can also assist other crayfish polysystems, like integrated agri-aquaculture systems containing yabbies (Cherax albidus). Some of the factors that influence how the system will perform may become more prevalent, like suspended clay turbidity and the associated role of light intensity in species interactions, or shelter complexity and the resulting choice of shelter material. But overall, they are the same basic variables and we must understand how they affect the particular multi-species system that we are dealing with. There is a lot to be learned from the literature on how these variables affect multi-species aquatic environments in the wild. Perhaps aquaculturists have not considered this enough in the past. Some farmers seem to believe that these variables are different JUST because it is a culture system. This is not true. / The variables will take on different levels in a culture system (i.e. a manager will stimulate turbidity, provide artificial feeds, stock different sizes, and supply particular types of shelter) BUT the actual variables themselves (e.g. food, density, light, shelter) are basic to ALL aquatic ecosystems. Other researchers have looked at important factors like density, gender, and light intensity / turbidity in crayfish polysystems - but the issue of habitat complexity and the role of shelter has not been adequately addressed. This thesis will investigate some basic questions about shelter and endeavour to apply them to crayfish polysystems, with the emphasis on marron (C. tenuimanus) and yabbies (C. albidus) because these are the two most commercially important species of crayfish in Western Australia. Importantly, it should be noted that due to the invasive nature of yabbies, and their apparent ability to displace native marron in the wild, findings will be related to yabby-marron competition / displacement where relevant. We need to know many things about shelter: what type is best in a multi-species system? Should the shelter size match the crayfish size? Do marron have different requirements for shelter than yabbies? Does it matter who gets first use of a shelter (i.e. prior residence effect)? Can we learn about crayfish shelter requirements by examining the behaviour / plasticity of crayfish species? If crayfish are stocked with finfish and they retreat into shelter as a predator-avoidance measure, is the complexity important given that their densities will be higher? If densities of crayfish inside shelters are higher in polysystems, will cannibalism be a concern, particularly when conditions are right for moulting? Does visual recognition and / or chemo-detection of a predator affect the shelter usage by marron or yabbies? / Does temperature affect shelter usage behaviour for a burrowing species like yabbies? Shelter is an important factor in the life history of a freshwater crayfish and an understanding of its influence on different species is important for maximising system performance. Crayfish are categorised depending on their ability to construct shelters (i.e. burrows). Yabbies have evolved in systems with fluctuating water quality and many predators and, as such, have learned to burrow (to escape drought and also to escape predators). Marron, on the other hand, are a non-burrowing native crayfish species that have existed with relatively few predators in the South-West. As a result, marron are less capable of modifying their behaviour when confronted with a predator (i.e. low behavioural plasticity). Species with high plasticity, like yabbies, are more capable of adapting to new environments, because they can change their behaviour to increase their chance of survival. Therefore we can expect yabbies and marron to utilize habitats differently and we should compare these behaviours as a basis to developing management strategies. This type of knowledge may also assist with managing the translocation and spread of yabbies in the wild and their displacement of native marron.Within multi-species systems, the physical structure of shelter plays an important role inprotecting crayfish and the perfect shelter would not only provide safety from co-stocked finfish, but also from conspecific cannibalism. Given the different life histories and behaviours, it is probable that both species of crayfish will have different refuge requirements.Over the course of this four-year investigation, trials were conducted in four culture systems (72L aquariums, 300L circular tanks, 80t mesocosm tank, and 720m2 earthen ponds) using marron and yabbies as the species of interest. / Silver perch and Murray cod were chosen as the finfish species of interest as they appear to have the highest aquaculture potential for native freshwater finfish in Australia at the present time. Further, both of these fish have been documented as potential predators of crayfish, resulting in a challenge to understand the role of shelter in minimising the negative effects of fish-crayfish interactions within a polysystem. This study has confirmed that shelter plays a critical role in multi-species system dynamics. In the case of polysystems, it will affect both interspecific and intra-specific interactions, ultimately governing production and profitability, along with the other, previously defined factors. This means that the manager of a polysystem can influenceproductivity by understanding: a) the behavioural characteristics and biology of the crayfish; b) the feeding biology of the finfish; and c) the system variables (both biotic and abiotic) that will affect the overall well being of the fish and crayfish. In the case ofshelter, the manager should understand the available shelter types, the appropriatedensities, the importance of matching complexity to the crayfish size, and the prior residence effect when choosing a timing strategy for stocking and harvesting. Prior residence increased resource holding potential for both marron and yabbies in the short term. In fact, prior residence was a stronger determinant of successful sheltering than crayfish gender or species. However, in longer-term trials the physical size of the crayfish (larger animals evicted smaller animals) and reproductive status (berried females were successful at evicting all other crayfish) were more important factors in determining successful shelter acquisition, although the temporal variations (i.e. growth and release of young) complicate the issue. / When stocking crayfish of different sizes, and in polysystems, the correct size of shelter becomes critical, as smaller individuals will be forced to leave over-sized shelter and locate a shelter commensurate with their own body size to avoid predators. This is relevant to crayfish nurseries where complex habitat is paramount for juvenile cohorts that display variation in sizes and gender. The expansion of crayfish polyculture holds considerable promise; however, furtherinvestigations are required into shelter complexity within floating fish cages, shelter types and arrangement of shelters within ponds (for increased production and ease-of-harvesting), potential of yabbies in polyculture (comparison of monosex and hybrid strains), and the impact of shelter on escape behaviour of marron in a polysystem.

This study describes students' perceptions of their physics classroom learning environments and their interactions with their teachers in upper secondary school classes in Thailand. Associations between these perceptions and students' attitudes toward physics were also determined. The learning environment perceptions were obtained using the 35-item Physics Laboratory Environment Inventory (PLEI) modified from the original Science Laboratory Environment Inventory (Fraser, McRobbie, & Giddings, 1993). Teacher-student interactions were assessed with the 48-item Questionnaires on Teacher Interaction (QTI) (Wubbels & Levy, 1993). Both these questionnaires have an Actual Form (assesses the class as it actually is) and a Preferred Form (asks the students what they would prefer their class to be like - the ideal situation). Students' attitudes were assessed with a short Attitude scale. The questionnaires were translated into the Thai language and administered to a sample of 4,576 students in 245 physics classes at the grade 12 level. Statistically significant differences were found between the students' perceptions of actual and preferred environments and teacher interpersonal behaviour in Thailand. Associations between students' perceptions of their learning environments and teachers' interpersonal behaviour with their attitudes to their physics classes also were found. It was found from interviews with a sub-sample that particular categories of comments could be identified, physics being a difficult subject, evaluation and assessments not being related to the tertiary entrance examination, and teachers' plans. These factors appear to be affecting student achievement in physics. Based on all the findings, suggestions for improving the physics laboratory classroom environment and teacher interpersonal behaviour with students' perceptions are provided.

This thesis in an invistigation into the concept of "harm" and its moral relevance. A common view is that an analysis of harm should include a counterfactual condition: an act harms a person iff it makes that person worse off. A common objection to the moral relevance of harm, thus understood, is the non-identity problem. This thesis criticises the counterfactual condition, argues for an alternative analysis and that harm plays two important normative roles. The main ground for rejecting the counterfactual condition is that it has unacceptable consequences in cases of overdetermination and pre-emption. Several modifications to the condition are considered but all fail to solve this problem. According to the alternative analysis to do harm is to perform an act which (1) is responsible for the obtaining of a state of affairs which (2) makes a person’s life go worse. It is argued that (1) should be understood in terms of counterfactual dependence. This claim is defended against counterexamples based on redundant causation. An analysis of (2) is also provided using the notion of a well-being function. It is argued that by introducing this notion it is possible to analyse contributive value without making use of counterfactual comparisons and to solve the non-identity problem. Regarding the normative importance of harm, a popular intuition is that there is an asymmetry in our obligations to future people: that a person would have a life worth living were she to exist is not a reason in favour of creating that person while that a person would have a life not worth living is a reason against creating that person. It is argued that the asymmetry can be classified as a moral option grounded in autonomy. Central to this defence is the suggestion that harm is relevant to understanding autonomy. Autonomy involves partly the freedom to pursue one’s own aims as long as one does no harm.

The purpose of the study is to investigate how well the mathematics achievement is explained by the students and school related factors. Also, to what extent students and school related factors components are accounted for students&rsquo / mathematics achievement in answering reasoning level questions and basic mathematical knowledge questions will be investigated. This study will basically combine students&rsquo / questionnaires items with their mathematics achievement scores obtained from mathematics achievement tests items. According to content and cognitive domains three achievement tests were prepared from TIMSS-2003 released mathematic items. Student questionnaire consist of combination of items from TIMSS-2003 and TMSS-1999 student questionnaires. The seventy six items selected from the students questionnaires were analyzed using principle component factor analysis and ten interpretable dimensions were found. Based on the result of the factor analysis, variables were generated by selecting the observed variables with highest loadings. These variables were: socioeconomic status, perception of success, teacher centered activities, students centered activities, out of school activities, out of school activities II, school climate, reason for being successful in mathematics, homework and computer. The data which is used in the study gathered from four socially and economically different schools in Ankara and the final sample of the study consisted of 426 elementary school students. This data was analyzed by using regression analysis. Regression analysis results indicated that socio-economic status was the strongest factor explaining mathematics achievement. Other important variables were the perception of success, use of computers and homework activities. Socioeconomic status and perception of success have positive relationships with mathematics achievement, while homework and computer have negative relationships. These four variables account for the 30.1 % of the variance in mathematics achievement. Other variables did not significantly contribute to mathematics achievement in the regression model. Students&rsquo / achievement in basic mathematical knowledge was explained by the same variables which were socioeconomic status, perception of success, homework and computer in the same way. However, achievement in reasoning level explained by socio- economic status, perception of success and homework. The use of computer factor did not contribute the achievement in reasoning level.

Researchers have been addressing on entry strategies, most of them are foreign researchers conducted researches on multinational firms, especially firms entering developed European countries or USA. Domestic researches mainly focused on firms entering PRC market, literally few studies have been found served Taiwan as the market being entered. Since Taiwan released the limit on foreigner share holding proportions in 1984, international advertisement firms gradually entered Taiwan. In the score years, Taiwan¡¦s advertisement market have been totally owned by foreign firms, thus Taiwanese advertisement firms need a method to break through. Given southeastern Asia markets are emerging, for Taiwanese advertisement firms, they pose as a market to be invested. Thus this thesis analyzed the entry mode of international advertising firms in order to serve as a reference to Taiwanese advertisement firms. This research served the period between establishment and entering Taiwan, cultural differences, five years average growth rate of GDP per capita, five years average growth rate of FDI in origin country, year 1984 and the changes in the number of competitors as the independent variables, and ownership or not as the dependent variable, applied logistic regression models in testing the relation between the selected variables. Outcomes indicate that cultural differences factor and five years average growth rate of GDP per capita factor bear significant factor loading while the other yielded insignificant results. Emerging countries in Asia ¡V e.g. Vietnam and Thailand ¡V possess close culture characteristics with Taiwan. Thus if advertisement firms are willing to invest in these markets, it is suggested to enter with ownership ¡V especially when the underlying countries¡¦ GDP growth rates are high.

Syftet med den här uppsatsen har varit att undersöka vilka faktorer som är avgörande vid beslut kring outsourcing för högskolor och universitet. Studien har främst baserats på information från intervjuer med representanter från de utvalda högskolorna och universiteten i Sverige. Utformningen av referensramen grundar sig på litteratur och tidigare forskning inom outsourcing. Det har visat sig finnas ett antal för- och nackdelar med outsourcing, där de främsta fördelarna är kostnadsbesparing, tillgång till specialistkunskap och fokus på kärnverksamheten. De främsta nackdelarna är minskad intern kunskap, ökat beroende av leverantören och minskad kontroll över den outsourcade aktiviteten. Vissa av dessa för- och nackdelar har även varit avgörande vid beslut kring outsourcing. Den mest avgörande faktorn som högskolorna och universiteten nämner är tillgången till specialistkunskap och den ekonomiska faktorn.

Offshoring, meaning the movement of business operations to foreign countries, has recently grown. It provides the company with opportunities which are not available domestically, but it also bears risks. The public has recently blamed the strategy of offshoring for weak growth of domestic economy, decreasing competitiveness, salary stagnation, job losses, lower worker morale, and poverty. As a consequence, a firm carrying out offshoring activities could suffer from consumers' negative attitudes towards offshoring, as the consumers are unwilling to buy their products/services or take actions against the company. This study addresses the Swedish young adults' attitudes towards offshoring. Young adults are playing an important role in economy as consumers, future workers, innovators, leaders and decision makers. The study investigates the factors that were underlying the formation of attitudes towards offshoring. We focused especially on three factors, namely consumer ethnocentrism, economic threat and quality beliefs. In order to address these issues, a quantitative research approach was applied and primary data were collected. The variables for the online survey were mainly distilled from Durvasula and Lysonski (2009) as well Grappi, Romani and Bagozzi (2013). The gathered data have been analyzed via the software of SPSS by performing correlation tests and analyzing descriptive statistic measures. The results indicated that Swedish young adults had neutral attitudes towards offshoring. We also found that two of the studied factors, consumer ethnocentrism and economic threat, were vital in the formation of the attitudes towards offshoring.

No description available.