Valkolakki vai haalarit, vaiko molemmat : Koulutuspolitiikan vaikuttajien näkemykset toisen asteen kehityksestä

In the present research Finnish education policy-makers describe the transformation in upper secondary education in the 1990s. They answered questions related to equality and all-round education. The timeline of the research extends from the early development of the welfare state and equality policy to the 2000s. Its focus is on upper secondary education, which, in this paper, denotes general upper secondary education and vocational upper secondary education. The chronological analysis proceeds from the education committee of 1971 up to the youth education experiment of the 1990s. The voices of the then policy-makers are heard in this research. They were the ones who planned the reforms and/or made the decisions. This being the case, the interviewees include cabinet ministers, permanent secretaries, representatives of organisations and the research community as well as civil servants. The research material can be construed as contextual interpretations of the past, influenced by both the times and places where the narrations were given. The persons interviewed described their experiences and views on education policy. In their narratives they illustrated the transformation that occurred in relation to equality and all-round education. The narrative interviews painted a picture of the upper secondary education transformation and the matriculation examination as having a slowing effect on education policy reforms. It was not until the 1990s when the said examination began to make a difference to students in vocational upper secondary education Those interviewed named the persons who, in their opinion, had the most say in Finnish education policy. This list comprised a small circle of people who more or less agreed on the grand values of education policy, i.e. all-round education and equality. Only a small minority represented a radical view of equality, being true believers in universal upper secondary education implemented in accordance with comprehensive school reform. Finnish education policy was led from the perspective of traditional conception of equality from the 1970s to the 1980s. The transformation finally occurred in the 1990s when equality was understood to mean individual needs and the right to choose. As was the case with matriculation education, the insistence on all-round education also hampered the development of universal upper secondary education. The interviews revealed that any attempts to increase the academic syllabus of vocational education caused organisations as well as other policy-makers to oppose such development well into the 1980s. It was not until the youth education experiment of the 1990s that vocational education finally carved a path to higher education, when the polytechnic schools were made permanent. Three principal groups of key players emerged in the research: ministers of education, civil servants and organisations. The research showed that the ministers and civil servant education policy-makers of the 1990s also included only handful women. The circle of policy-makers was small and represented similar schools of thought. In the 1970s era of government committees, representatives of organisations actively participated in education policy. When the committee establishment was discontinued, this eliminated lobbying venues for the organisations. Nonetheless, the organisations regained their policymaking status in the 1990s. New lobbying organisations included the Finnish Entrepreneurs and the Union of Finnish Upper Secondary School Students. However, in contrast to the 1970s, only rarely would individuals rise from the ranks of organisations to the cadre of policy-makers. The interviewees had a twofold view of neo-liberalism Contrary to other policy-makers, representatives of the research community and organisations concur that neo-liberalism did exist in education policy decision-making in the 1990s.

Measurement of the corrosion rate of aluminium in sodium hydroxide using holographic interferometry

The application of holographic interferometry to the measurement of the corrosion rate of aluminium in sodium hydroxide is investigated. Details of the fabrication of the corrosion cell and the experimental procedure are given. Thickness loss of aluminium was found for different dissolution times and compared with the conventional weight-loss method using a microbalance.

Kansalaisuus työyhteisön arjessa : Maahanmuuttajien kertomuksia työelämästä

Citizenship in the everyday of a work community. Immigrants narratives of working life. Through globalisation and the mobility of workforce, citizenship has gained new forms, and the mere legal definition of citizenship no longer gives a comprehensive view of the citizenship of an individual. Also the social, cultural and financial dimensions of it are related to the concept of citizenship. In Finland, full citizenship is promoted, according to the Integration Act and social security system, by the requirement that immigrants should mainly get their livelihood through work. In my study I approach citizenship on four levels: the global, national, work community and private levels. In the study, the global has constituted the largest possible context, which refers to the local affects of global processes. The local and the global come together in the research in that globalisation is realised on the local level, i.e. in small communities such as work communities. The objective of the study is to examine how the citizenship of immigrants who live and work in Finland is constructed in the everyday life of a work community. The most central concept of the study is cultural script, which is based on prevailing forms of knowing, and which are constructed in different ways in different times and cultures. Conflicts of scripts in the working life and difficulties in understanding and applying them are in the centre of the study. In the study, the working life experiences of immigrants are approached through narrative research. The research material consists of the working life narratives of nine immigrants who live and work in Finland permanently. Each interviewee has been interviewed 2 4 times so the research material consists of 26 interviews. The material has been analysed from the points of view of perception, feeling and action. Deborah Tannen s and William Labov s as well as Matti Hyvärinen s method of expectancy analysis to locate cultural scripts has been utilised to organise the research material. In addition, David Herman s concepts of participatory roles and event types formed in narratives have been used in the analysis of the material. The basis in the analysis is that the world, events and experiences do not define the available processes; they are always culturally and individually anchored choices of the speaker and narrator. The most important results of the study are related to the gap between globalisation and everyday life. The discussion about the future need for workforce due to the changing population structure as well as about the benefits for national economy brought by internationalisation has continued in Finland for years. However, the working life narratives of the immigrants interviewed for the study show that an average citizen and member of a work community does not immediately encounter the macro level benefits in, for example, the mobility of workforce. In most of the working life narratives there was a point in speaking and saying, in which the immigrant worker either dares to speak or falls silent. Sometimes the courage to speak was related to language skills but more to the courage to be seen and to be part of a Finnish work community. Other workers that either speak their colleague with an immigrant background into a part of their work community or marginalise the colleague with their silence have an important role in a Finnish work community. In several working life narratives, the script of the Finnish working life and work community, the way to work, was opened to the immigrant and the so-called script exchange did not take place. The study shows that working life experiences and inclusion and exclusion built on the working life have an important role in the construction of active citizenship. The detailed analysis of the working life experience narratives gives new, relevant research data about citizenship as inclusion.

Homonuclear NOE in spatially periodic spin systems

The nuclear Overhauser effect equations are solved analytically for a homonuclear group of spins whose sites are periodically arranged, including the special cases where the spins lie at the vertices of a regular polygon and on a one-dimensional lattice. t is shown that, for long correlation times, the equations governing magnetization transfer resemble a diffusion equation. Furthermore the deviation from exact diffusion is quantitatively related to the molecular tumbling correlation time. Equations are derived for the range of magnetization travel subsequent to the perturbation of a single spin in a lattice for both the case of strictly dipolar relaxation and the more general situation where additional T1 mechanisms may be active. The theory given places no restrictions on the delay (or mixing) times, and it includes all the spins in the system. Simulations are presented to confirm the theory.

Nonvaporable Getter Application in Cryogenic Systems

The application of non-evaporable Zr-V-Fe getters to enhance and maintain the vacuum of cryogenic systems have been studied. It has been shown that the pressur erise rate of the insulation space of these systems are significantly reduced by the getter activation. The gettering action is substantial even at abient temperature for many gases including hydrogen which can not be cryosorbed at LN2 temperatures. The getter can be activated several times and they can act as in-situ pumps for cryogenic systems, especially for field units.

Queued Cooperative Wireless Networks With Rateless Codes

Cooperative communication using rateless codes, in which the source transmits an infinite number of parity bits to the destination until the receipt of an acknowledgment, has recently attracted considerable interest. It provides a natural and efficient mechanism for accumulating mutual information from multiple transmitting relays. We develop an analysis of queued cooperative relay systems that combines the communication-theoretic transmission aspects of cooperative communication using rateless codes over Rayleigh fading channels with the queuing-theoretic aspects associated with buffering messages at the relays. Relay cooperation combined with queuing reduces the message transmission times and also helps distribute the traffic load in the network, which improves throughput significantly.

Optimal control of arrivals to queues with delayed queue length information

We consider discrete-time versions of two classical problems in the optimal control of admission to a queueing system: i) optimal routing of arrivals to two parallel queues and ii) optimal acceptance/rejection of arrivals to a single queue. We extend the formulation of these problems to permit a k step delay in the observation of the queue lengths by the controller. For geometric inter-arrival times and geometric service times the problems are formulated as controlled Markov chains with expected total discounted cost as the minimization objective. For problem i) we show that when k = 1, the optimal policy is to allocate an arrival to the queue with the smaller expected queue length (JSEQ: Join the Shortest Expected Queue). We also show that for this problem, for k greater than or equal to 2, JSEQ is not optimal. For problem ii) we show that when k = 1, the optimal policy is a threshold policy. There are, however, two thresholds m(0) greater than or equal to m(1) > 0, such that mo is used when the previous action was to reject, and mi is used when the previous action was to accept.

Reactivation kinetics of boron acceptors in hydrogenated silicon during zero bias anneal

The reactivation kinetics of passivated boron accepters in hydrogenated silicon during zero bias annealing in the temperature range of 65-130 degrees C are reported, For large annealing times and high annealing temperatures, the reactivation process follows second-order kinetics and is rate limited by a thermally activated <(H)over tilde (2)> complex formation process, For short annealing times and low annealing temperatures, the reactivation rate is found to be larger than that due to <(H)over tilde (2)> complex formation alone. We conclude that the faster reactivation is caused by the diffusion of the liberated hydrogen atoms into the bulk as well as <(H)over tilde (2)> complex formation. The effective diffusion coefficient of hydrogen is measured and found to obey the Arrhenius relation with an activation energy (1.41 +/- 0.1) eV. (C) 1997 American Institute of Physics.

Continuous distribution kinetics for the thermal degradation of LDPE in solution

Polymer degradation in solution has several advantages over melt pyrolysis, The degradation of low-density polyethylene (LDPE) occurs at much lower temperatures in solution (280-360degreesC) than in conventional melt pyrolysis (400-450degreesC). The thermal degradation kinetics of LDPE in solution was investigated in this work. LDPE was dissolved in liquid paraffin and degraded for 3 h at various temperatures (280-360degreesC). Samples were taken at specific times and analyzed with high-pressure liquid chromatography/gel permeation chromatography for the molecular weight distribution (MWD), The time evolution of the MWD was modeled with continuous distribution kinetics. Data indicated that LDPE followed random-chain-scission degradation. The rapid initial drop in molecular weight, observed up to 45 min, was attributed to the presence of weak links in the polymer. The rate coefficients for the breakage of weak and strong links were determined, and the corresponding average activation energies were calculated to be 88 and 24 kJ/mol, respectively. (C) 2002 John Wiley Sons, Inc.

Impact of Sulphate counter ion in the migration of sodium ion through soils

Laboratory advection-diffusion tests are performed on two regional soils-Brown Earth and Red Earth-in order to assess their capacity to control contaminant migration with synthetic contaminant solution of sodium sulphate with sodium concentration of 1000 mg/L. The test was designed to study the transport/attenuation behaviour of sodium in the presence of sulphate. Effective diffusion coefficient (De) that takes into consideration of attenuation processes is used. Cation exchange capacity is an important factor for the attenuation of cationic species. Monovalent sodium ion cannot usually replace other cations and the retention of sodium ion is very less. This is particularly true when chloride is anion is solution. However, sulphate is likely to play a role in the attenuation of sodium. Cation exchange capacity and type of exchangeable ions of soils are likely to play an important role. The effect of sulphate ions on the effective diffusion coefficient of sodium, in two different types of soils, of different cation exchange capacity has been studied. The effective diffusion coefficients of sodium ion for both the soils were calculated using Ogata Bank’s equation. It was shown that effective diffusion coefficient of sodium in the presence of sulphate is lower for Brown Earth than for Red Earth due to exchange of sodium with calcium ions from the exchangeable complex of clay. The soil with the higher cation exchange retained more sodium. Consequently, the breakthrough times and the number of pore volumes of sodium ion increase with the cation exchange capacity of soil.

Subdiffusion as a model of transport through the nuclear pore complex

Cargo transport through the nuclear pore complex continues to be a subject of considerable interest to experimentalists and theorists alike. Several recent studies have revealed details of the process that have still to be fully understood, among them the apparent nonlinearity between cargo size and the pore crossing time, the skewed, asymmetric nature of the distribution of such crossing times, and the non-exponentiality in the decay profile of the dynamic autocorrelation function of cargo positions. In this paper, we show that a model of pore transport based on subdiffusive particle motion is in qualitative agreement with many of these observations. The model corresponds to a process of stochastic binding and release of the particle as it moves through the channel. It suggests that the phenylalanine-glycine repeat units that form an entangled polymer mesh across the channel may be involved in translocation, since these units have the potential to intermittently bind to hydrophobic receptor sites on the transporter protein. (C) 2011 American Institute of Physics. [doi:10.1063/1.3651100]

Filling Characteristics for an Activated Carbon Based Adsorbed Natural Gas Storage System

The storage capacity of an activated carbon bed is studied using a 2D transport model with constant inlet flow conditions. The predicted filling times and variation in bed pressure and temperature are in good agreement with experimental observations obtained using a 1.82 L prototype ANG storage cylinder. Storage efficiencies based on the maximum achievable V/V (volume of gas/volume of container) and filling times are used to quantify the performance of the charging process. For the high permeability beds used in the experiments, storage efficiencies are controlled by the rate of heat removal. Filling times, defined as the time at which the bed pressure reaches 3.5 MPa, range from 120 to 3.4 min for inlet flow rates of 1.0 L min(-1) and 30.0 L min(-1), respectively. The corresponding storage efficiencies, eta(s), vary from 90% to 76%, respectively. Simulations with L/D ratios ranging from 0.35 to 7.8 indicate that the storage efficiencies can be improved with an increase in the LID ratios and/or with water cooled convection. Thus for an inlet flow rate of 30.0 L min(-1), an eta(s) value of 90% can be obtained with water cooling for an L/D ratio of 7.8 and a filling time of a few minutes. In the absence of water cooling the eta(s) value reduces to 83% at the same L/D ratio. Our study suggests that with an appropriate choice of cylinder dimensions, solutions based on convective cooling during adsorptive storage are possible with some compromise in the storage capacity.

Scheduling identical parallel machines with machine eligibility restrictions to minimize total weighted flowtime in automobile gear manufacturing

In this paper, we address a scheduling problem for minimizing total weighted flowtime, observed in automobile gear manufacturing. Specifically, the bottleneck operation of the pre-heat treatment stage of gear manufacturing process has been dealt with in scheduling. Many real-life scenarios like unequal release times, sequence dependent setup times, and machine eligibility restrictions have been considered. A mathematical model taking into account dynamic starting conditions has been proposed. The problem is derived to be NP-hard. To approach the problem, a few heuristic algorithms have been proposed. Based on planned computational experiments, the performance of the proposed heuristic algorithms is evaluated: (a) in comparison with optimal solution for small-size problem instances and (b) in comparison with the estimated optimal solution for large-size problem instances. Extensive computational analyses reveal that the proposed heuristic algorithms are capable of consistently yielding near-statistically estimated optimal solutions in a reasonable computational time.

Tuning the Sensitivity of a Metal-Based Piezoresistive Sensor Using Electromigration

We report a simple method to enhance the piezoresistive sensitivity of a gold film by more than 30 times and demonstrate it using a microcantilever resonator. Our method depends on controlled electromigration that we use to tune the resistance and sensitivity of the piezoresistive sensor. We attribute the enhancement in strain sensitivity to the creation of an inhomogeneous conduction medium at a predefined location by directed and controlled electromigration. We understand this phenomenon with tunneling-percolation model, which was originally hypothesized to explain nonuniversal percolation behavior of composite materials. 2012-0174]

Relay Selection for Geographical Forwarding in Sleep-Wake Cycling Wireless Sensor Networks

Our work is motivated by geographical forwarding of sporadic alarm packets to a base station in a wireless sensor network (WSN), where the nodes are sleep-wake cycling periodically and asynchronously. We seek to develop local forwarding algorithms that can be tuned so as to tradeoff the end-to-end delay against a total cost, such as the hop count or total energy. Our approach is to solve, at each forwarding node enroute to the sink, the local forwarding problem of minimizing one-hop waiting delay subject to a lower bound constraint on a suitable reward offered by the next-hop relay; the constraint serves to tune the tradeoff. The reward metric used for the local problem is based on the end-to-end total cost objective (for instance, when the total cost is hop count, we choose to use the progress toward sink made by a relay as the reward). The forwarding node, to begin with, is uncertain about the number of relays, their wake-up times, and the reward values, but knows the probability distributions of these quantities. At each relay wake-up instant, when a relay reveals its reward value, the forwarding node's problem is to forward the packet or to wait for further relays to wake-up. In terms of the operations research literature, our work can be considered as a variant of the asset selling problem. We formulate our local forwarding problem as a partially observable Markov decision process (POMDP) and obtain inner and outer bounds for the optimal policy. Motivated by the computational complexity involved in the policies derived out of these bounds, we formulate an alternate simplified model, the optimal policy for which is a simple threshold rule. We provide simulation results to compare the performance of the inner and outer bound policies against the simple policy, and also against the optimal policy when the source knows the exact number of relays. Observing the good performance and the ease of implementation of the simple policy, we apply it to our motivating problem, i.e., local geographical routing of sporadic alarm packets in a large WSN. We compare the end-to-end performance (i.e., average total delay and average total cost) obtained by the simple policy, when used for local geographical forwarding, against that obtained by the globally optimal forwarding algorithm proposed by Kim et al. 1].