Vibration frequency measurement using a local multithreshold technique

In this paper, we demonstrate the use of a video camera for measuring the frequency of small-amplitude vibration movements. The method is based on image acquisition and multilevel thresholding and it only requires a video camera with high enough acquisition rate, not being necessary the use of targets or auxiliary laser beams. Our proposal is accurate and robust. We demonstrate the technique with a pocket camera recording low-resolution videos with AVI-JPEG compression and measuring different objects that vibrate in parallel or perpendicular direction to the optical sensor. Despite the low resolution and the noise, we are able to measure the main vibration modes of a tuning fork, a loudspeaker and a bridge. Results are successfully compared with design parameters and measurements with alternative devices.

Early Eocene benthic carbon isotope data of ODP Site 208-1263

The early Eocene represents a time of major changes in the global carbon cycle and fluctuations in global temperatures on both short- and long-time scales. These perturbations of the ocean-atmosphere system have been linked to orbital forcing and changes in net organic carbon burial, but accurate age models are required to disentangle the various forcing mechanisms and assess causal relationships. Discrepancies between the employed astrochronological and radioisotopic dating techniques prevent the construction of a robust time frame between ~49 and ~54 Ma. Here we present an astronomically tuned age model for this critical time period based on a new high-resolution benthic d13C record of ODP Site 1263, SE Atlantic. First, we assess three possible tuning options to the stable long-eccentricity cycle (405-kyr), starting from Eocene Thermal Maximum 2 (ETM2, ~54 Ma). Next we compare our record to the existing bulk carbonate d13C record from the equatorial Atlantic (Demerara Rise, ODP Site 1258) to evaluate our three initial age models and compare them with alternative age models previously established for this site. Finally, we refine our preferred age model by expanding our tuning to the 100-kyr eccentricity cycle of the La2010d solution. This solution appears to accurately reflect the long- and short-term eccentricity-related patterns in our benthic d13C record of ODP Site 1263 back to at least 52 Ma and possibly to 54 Ma. Our time scale not only aims to provide a new detailed age model for this period, but it may also serve to enhance our understanding of the response of the climate system to orbital forcing during this super greenhouse period as well as trends in its background state.

An exposition of the New Testament : wherein each chapter is summed up in its contents ... /

Vol. 1 has added t.p.: Matthew Henry's Commentary on the New Testament. With preface by C.H. Spurgeon.

Cultural information gathering by Australian students in France

Interviews with Australian university students returning from study in France indicate that problems in accessing crucial information are common experiences, and frequently lead to students reproducing stereotypes of French administrative inefficiency. Our paper argues that the issue is not one of information per se but of cultural differences in the dissemination of information. It analyses the ways in which students interpret their information-gathering difficulties, and the appropriateness of the strategies they devise for overcoming them. It then examines the pedagogical implications for preparing students for study abroad, suggesting means of both equipping students with alternative ways of understanding 'information skills' and intervening in the perpetuation of stereotypes. Cet article se base sur une quarantaine d'interviews avec des étudiants australiens ayant effectué des séjours d'études en France. La difficulté d'accéder aux renseignements jugés indispensables revient souvent au cours des entretiens, source de frustrations qui amène les Australiens à reproduire un stéréotype de l'inefficacité française. Nous posons qu'il s'agit moins d'un manque d'informations que d'une différence culturelle dans la diffusion des renseignements. Notre analyse porte sur les façons dont les étudiants interprètent leurs difficultés, ainsi que sur l'utilité de leurs stratégies pour réunir les données souhaitées. Ce travail a des conséquences pédagogiques pour la préparation de tels séjours : nous suggérons des moyens de conduire les étudiants à concevoir autrement la recherche de l'information et leurs expériences, intervenant ainsi dans la transmission des stéréotypes.

O CADERNO FOLHETIM E O JORNALISMO CULTURAL DA FOLHA DE S. PAULO (1977 - 1989)

O caderno semanal Folhetim, da Folha de S. Paulo, foi publicado entre 1977 e 1989. Teve três fases distintas, caracterizadas pela semelhança com a imprensa alternativa (no período 1977-1979), pela abertura de espaços à discussão sobre a retomada da democracia, sobre temas sociais e por uma aproximação com as universidades (1979-1982) e pela publicação de ensaios altamente especializados (1982-1989). Procura-se analisar os fatores determinantes dessas reorientações editoriais do Folhetim, como a influência do mercado de jornais, do processo de abertura política e das reformas operadas na Folha a partir de 1974.(AU)

All optical networking beyond 10 Gbits/s OTDM networks based on electro-optic modulators and fibre ring lasers

This thesis examines options for high capacity all optical networks. Specifically optical time division multiplexed (OTDM) networks based on electro-optic modulators are investigated experimentally, whilst comparisons with alternative approaches are carried out. It is intended that the thesis will form the basis of comparison between optical time division multiplexed networks and the more mature approach of wavelength division multiplexed networks. Following an introduction to optical networking concepts, the required component technologies are discussed. In particular various optical pulse sources are described with the demanding restrictions of optical multiplexing in mind. This is followed by a discussion of the construction of multiplexers and demultiplexers, including favoured techniques for high speed clock recovery. Theoretical treatments of the performance of Mach Zehnder and electroabsorption modulators support the design criteria that are established for the construction of simple optical time division multiplexed systems. Having established appropriate end terminals for an optical network, the thesis examines transmission issues associated with high speed RZ data signals. Propagation of RZ signals over both installed (standard fibre) and newly commissioned fibre routes are considered in turn. In the case of standard fibre systems, the use of dispersion compensation is summarised, and the application of mid span spectral inversion experimentally investigated. For green field sites, soliton like propagation of high speed data signals is demonstrated. In this case the particular restrictions of high speed soliton systems are discussed and experimentally investigated, namely the increasing impact of timing jitter and the downward pressure on repeater spacings due to the constraint of the average soliton model. These issues are each addressed through investigations of active soliton control for OTDM systems and through investigations of novel fibre types respectively. Finally the particularly remarkable networking potential of optical time division multiplexed systems is established, and infinite node cascadability using soliton control is demonstrated. A final comparison of the various technologies for optical multiplexing is presented in the conclusions, where the relative merits of the technologies for optical networking emerges as the key differentiator between technologies.

Democratization of local government in Brazil : decentralisation and people's councils

This research studies two cases of implementation of alternative strategies for municipal government reform in Brazil, decentralisation and People's Councils. The aim is to answer the following general question: `Can decentralisation and People's Councils be a means for democratization of municipal government in Brazil?'. The hypothesis is that initiatives to reform Brazilian municipal governments face problems that are characteristic of the Brazilian political and administrative reality. These problems are considered obstacles for the development of those initiatives and accordingly, for democratization of municipal government in Brazil. After an introduction and outline in Chapter One, Chapter Two discusses four main theories concerning local government. Chapter Three discusses decentralisation and People's Councils are discussed in Chapter Four. Chapter Five presents a historical, political and economic overview of Brazil. Chapter Six deals with Brazilian Federalism and Municipal Government. The main aspects of the Municipal Government are presented as well as the development of municipal autonomy through the various Federal Constitutions and cases of People's Councils and decentralisation in municipalities in Brazil. Chapter Seven presents the political parties responsible for the initiatives, the PSDB (Brazilian Social Democratic Party) in the case of decentralisation, and the PT (Workers' Party) in the case of People's Councils. In Chapter Eight the research strategy and the data collection techniques are described. Chapters Nine and Ten present decentralisation implemented by the PSDB in Belo Horizonte, the Minas Gerais state capital and People's Councils introduced by the PT in the town of Ipatinga in the same state. Conclusions are presented in Chapter Eleven and include a comparison and discussion of the two cases. The thesis shows that these experiments with alternative strategies of local government face problems that are generally current in Brazilian political and administrative reality. Those problems are concerned with unwillingness to decentralise power, clientelism, low levels of participation of civil society and the `political' use of the structures implemented.

Productivity analysis and measurement

The state of the art in productivity measurement and analysis shows a gap between simple methods having little relevance in practice and sophisticated mathematical theory which is unwieldy for strategic and tactical planning purposes, -particularly at company level. An extension is made in this thesis to the method of productivity measurement and analysis based on the concept of added value, appropriate to those companies in which the materials, bought-in parts and services change substantially and a number of plants and inter-related units are involved in providing components for final assembly. Reviews and comparisons of productivity measurement dealing with alternative indices and their problems have been made and appropriate solutions put forward to productivity analysis in general and the added value method in particular. Based on this concept and method, three kinds of computerised models two of them deterministic, called sensitivity analysis and deterministic appraisal, and the third one, stochastic, called risk simulation, have been developed to cope with the planning of productivity and productivity growth with reference to the changes in their component variables, ranging from a single value 'to• a class interval of values of a productivity distribution. The models are designed to be flexible and can be adjusted according to the available computer capacity expected accuracy and 'presentation of the output. The stochastic model is based on the assumption of statistical independence between individual variables and the existence of normality in their probability distributions. The component variables have been forecasted using polynomials of degree four. This model is tested by comparisons of its behaviour with that of mathematical model using real historical data from British Leyland, and the results were satisfactory within acceptable levels of accuracy. Modifications to the model and its statistical treatment have been made as required. The results of applying these measurements and planning models to the British motor vehicle manufacturing companies are presented and discussed.

Evidence of a transition from perceptual to category induction in 3- to 9-year-old children

We examined whether inductive reasoning development is better characterized by accounts assuming an early category bias versus an early perceptual bias. We trained 264 children aged 3 to 9 years to categorize novel insects using a rule that directly pitted category membership against appearance. This was followed by an induction task with perceptual distractors at different levels of featural similarity. An additional 52 children were given the same training followed by an induction task with alternative stimuli. Categorization performance was consistently high, however we found a gradual transition from a perceptual bias in our youngest children to a category bias around age 6-7. In addition, children of all ages were equally distracted by higher levels of featural similarity. The transition is unlikely to be due to an increased ability to inhibit perceptual distractors. Instead, we argue that the transition is driven by a fundamental change in children’s understanding of category membership.

All-optical OFDM and distributed Raman amplification : challenges to enable high capacities and extend reach

We review recent advances in all-optical OFDM technologies and discuss the performance of a field trial of a 2 Tbit/s Coherent WDM over 124 km with distributed Raman amplification. The results indicate that careful optimisation of the Raman pumps is essential. We also consider how all-optical OFDM systems perform favourably against energy consumption when compared with alternative coherent detection schemes. We argue that, in an energy constrained high-capacity transmission system, direct detected all-optical OFDM with `ideal' Raman amplification is an attractive candidate for metro area datacentre interconnects with ~100 km fibre spans, with an overall energy requirement at least three times lower than coherent detection techniques.

How HR can inspire the teamwork that allows innovation to flourish

Innovation is vital if organisations are to deal effectively with social and economic change. Yet few studies have looked at the relationship between teamworking and innovation – or, indeed, other organisational outcomes. Our research aimed to fill this gap by exploring the extent to which team-based working in small- and medium- sized manufacturing organisations predicted product innovation. The results show that levels of innovation are higher in organisations using work-based teams than in those with alternative structural arrangements. We also found that effective HRM practices, such as sophisticated selection, induction, appraisal, training and remuneration management, created an environment that allowed teams to excel. The study drew on a variety of sources, including data on organisational-level innovation gathered through a postal survey. Respondents gave estimates of the number of new or adapted products developed in the past two years. They also detailed the percentage of production workers involved in making the new products; sales turnover accounted for by these products; and how far production processes had been changed to accommodate the innovations. We measured HRM effectiveness and the extent of teamworking via interviews with the relevant HR or production manager. We then rated each organisation on a scale of one to five, according to how effective its HRM practices were. We also examined the percentage of staff at management and shopfloor levels engaged in teamworking. The research design was longitudinal, in that the data on product innovation was collected six months to a year after the main questionnaire on teamworking was conducted. Other studies addressing these questions have tended to be cross-sectional, measuring both variables at the same time. Longitudinal studies generally make a stronger case for causality. Perhaps of most theoretical significance is the finding that teamworking combined with effective HR systems explains more of the variance for product innovation than teamworking alone. This is in line with J Richard Hackman (1990), who argued that organisational context affected team performance in various ways – for example, through offering a framework for the administration of reward and the exchange of knowledge and through promoting learning-oriented beliefs. Our work supports these ideas. This study also has practical implications. Increasing the number of teams may be an important step in determining the extent to which they can innovate on a sustained basis. Organisations should therefore consider what HRM practices are most likely to foster team innovation. They might, for example, explore how helpful it would be to develop team-based appraisal and better designed teamworking training. Developing support structures that enable teams to achieve outstanding performance may present a challenge, but our results suggest that such an approach will be worth the effort. Key points: • The greater the percentage of staff working in teams, the higher the level of innovation. • This applies to both management and production teams. • Where sophisticated and effective HRM practices are in place, the relationship between team-based working and product innovation becomes more pronounced. • Both cross-sectional and longitudinal analyses show strong relationships between team-based working and product innovation.

The multiple pheromone Ant clustering algorithm

Ant Colony Optimisation algorithms mimic the way ants use pheromones for marking paths to important locations. Pheromone traces are followed and reinforced by other ants, but also evaporate over time. As a consequence, optimal paths attract more pheromone, whilst the less useful paths fade away. In the Multiple Pheromone Ant Clustering Algorithm (MPACA), ants detect features of objects represented as nodes within graph space. Each node has one or more ants assigned to each feature. Ants attempt to locate nodes with matching feature values, depositing pheromone traces on the way. This use of multiple pheromone values is a key innovation. Ants record other ant encounters, keeping a record of the features and colony membership of ants. The recorded values determine when ants should combine their features to look for conjunctions and whether they should merge into colonies. This ability to detect and deposit pheromone representative of feature combinations, and the resulting colony formation, renders the algorithm a powerful clustering tool. The MPACA operates as follows: (i) initially each node has ants assigned to each feature; (ii) ants roam the graph space searching for nodes with matching features; (iii) when departing matching nodes, ants deposit pheromones to inform other ants that the path goes to a node with the associated feature values; (iv) ant feature encounters are counted each time an ant arrives at a node; (v) if the feature encounters exceed a threshold value, feature combination occurs; (vi) a similar mechanism is used for colony merging. The model varies from traditional ACO in that: (i) a modified pheromone-driven movement mechanism is used; (ii) ants learn feature combinations and deposit multiple pheromone scents accordingly; (iii) ants merge into colonies, the basis of cluster formation. The MPACA is evaluated over synthetic and real-world datasets and its performance compares favourably with alternative approaches.

Handling varying amounts of missing data when classifying mental-health risk levels

One of the main challenges of classifying clinical data is determining how to handle missing features. Most research favours imputing of missing values or neglecting records that include missing data, both of which can degrade accuracy when missing values exceed a certain level. In this research we propose a methodology to handle data sets with a large percentage of missing values and with high variability in which particular data are missing. Feature selection is effected by picking variables sequentially in order of maximum correlation with the dependent variable and minimum correlation with variables already selected. Classification models are generated individually for each test case based on its particular feature set and the matching data values available in the training population. The method was applied to real patients' anonymous mental-health data where the task was to predict the suicide risk judgement clinicians would give for each patient's data, with eleven possible outcome classes: zero to ten, representing no risk to maximum risk. The results compare favourably with alternative methods and have the advantage of ensuring explanations of risk are based only on the data given, not imputed data. This is important for clinical decision support systems using human expertise for modelling and explaining predictions.

All-optical OFDM and distributed Raman amplification:challenges to enable high capacities and extend reach

We review recent advances in all-optical OFDM technologies and discuss the performance of a field trial of a 2 Tbit/s Coherent WDM over 124 km with distributed Raman amplification. The results indicate that careful optimisation of the Raman pumps is essential. We also consider how all-optical OFDM systems perform favourably against energy consumption when compared with alternative coherent detection schemes. We argue that, in an energy constrained high-capacity transmission system, direct detected all-optical OFDM with `ideal' Raman amplification is an attractive candidate for metro area datacentre interconnects with ~100 km fibre spans, with an overall energy requirement at least three times lower than coherent detection techniques.

A study of stock market fluctuations and their relation to business conditions

Most research on stock prices is based on the present value model or the more general consumption-based model. When applied to real economic data, both of them are found unable to account for both the stock price level and its volatility. Three essays here attempt to both build a more realistic model, and to check whether there is still room for bubbles in explaining fluctuations in stock prices. In the second chapter, several innovations are simultaneously incorporated into the traditional present value model in order to produce more accurate model-based fundamental prices. These innovations comprise replacing with broad dividends the more narrow traditional dividends that are more commonly used, a nonlinear artificial neural network (ANN) forecasting procedure for these broad dividends instead of the more common linear forecasting models for narrow traditional dividends, and a stochastic discount rate in place of the constant discount rate. Empirical results show that the model described above predicts fundamental prices better, compared with alternative models using linear forecasting process, narrow dividends, or a constant discount factor. Nonetheless, actual prices are still largely detached from fundamental prices. The bubblelike deviations are found to coincide with business cycles. The third chapter examines possible cointegration of stock prices with fundamentals and non-fundamentals. The output gap is introduced to form the nonfundamental part of stock prices. I use a trivariate Vector Autoregression (TVAR) model and a single equation model to run cointegration tests between these three variables. Neither of the cointegration tests shows strong evidence of explosive behavior in the DJIA and S&P 500 data. Then, I applied a sup augmented Dickey-Fuller test to check for the existence of periodically collapsing bubbles in stock prices. Such bubbles are found in S&P data during the late 1990s. Employing econometric tests from the third chapter, I continue in the fourth chapter to examine whether bubbles exist in stock prices of conventional economic sectors on the New York Stock Exchange. The ‘old economy’ as a whole is not found to have bubbles. But, periodically collapsing bubbles are found in Material and Telecommunication Services sectors, and the Real Estate industry group.