Modified section method for laser-welding of ill-fitting cp Ti and Ni-Cr alloy one-piece cast implant-supported frameworks

P>This study aimed to verify the effect of modified section method and laser-welding on the accuracy of fit of ill-fitting commercially pure titanium (cp Ti) and Ni-Cr alloy one-piece cast frameworks. Two sets of similar implant-supported frameworks were constructed. Both groups of six 3-unit implant-supported fixed partial dentures were cast as one-piece [I: Ni-Cr (control) and II: cp Ti] and evaluated for passive fitting in an optical microscope with both screws tightened and with only one screw tightened. All frameworks were then sectioned in the diagonal axis at the pontic region (III: Ni-Cr and IV: cp Ti). Sectioned frameworks were positioned in the matrix (10-Ncm torque) and laser-welded. Passive fitting was evaluated for the second time. Data were submitted to anova and Tukey-Kramer honestly significant difference tests (P < 0 center dot 05). With both screws tightened, one-piece cp Ti group II showed significantly higher misfit values (27 center dot 57 +/- 5 center dot 06 mu m) than other groups (I: 11 center dot 19 +/- 2 center dot 54 mu m, III: 12 center dot 88 +/- 2 center dot 93 mu m, IV: 13 center dot 77 +/- 1 center dot 51 mu m) (P < 0 center dot 05). In the single-screw-tightened test, with readings on the opposite side to the tightened side, Ni-Cr cast as one-piece (I: 58 center dot 66 +/- 14 center dot 30 mu m) was significantly different from cp Ti group after diagonal section (IV: 27 center dot 51 +/- 8 center dot 28 mu m) (P < 0 center dot 05). On the tightened side, no significant differences were found between groups (P > 0 center dot 05). Results showed that diagonally sectioning ill-fitting cp Ti frameworks lowers misfit levels of prosthetic implant-supported frameworks and also improves passivity levels of the same frameworks when compared to one-piece cast structures.

Modularity and robustness of bone networks

Cortical bones, essential for mechanical support and structure in many animals, involve a large number of canals organized in intricate fashion. By using state-of-the art image analysis and computer graphics, the 3D reconstruction of a whole bone (phalange) of a young chicken was obtained and represented in terms of a complex network where each canal was associated to an edge and every confluence of three or more canals yielded a respective node. The representation of the bone canal structure as a complex network has allowed several methods to be applied in order to characterize and analyze the canal system organization and the robustness. First, the distribution of the node degrees (i.e. the number of canals connected to each node) confirmed previous indications that bone canal networks follow a power law, and therefore present some highly connected nodes (hubs). The bone network was also found to be partitioned into communities or modules, i.e. groups of nodes which are more intensely connected to one another than with the rest of the network. We verified that each community exhibited distinct topological properties that are possibly linked with their specific function. In order to better understand the organization of the bone network, its resilience to two types of failures (random attack and cascaded failures) was also quantified comparatively to randomized and regular counterparts. The results indicate that the modular structure improves the robustness of the bone network when compared to a regular network with the same average degree and number of nodes. The effects of disease processes (e. g., osteoporosis) and mutations in genes (e.g., BMP4) that occur at the molecular level can now be investigated at the mesoscopic level by using network based approaches.

Density-Profile Processes Describing Biological Signaling Networks: Almost Sure Convergence to Deterministic Trajectories

We introduce jump processes in R(k), called density-profile processes, to model biological signaling networks. Our modeling setup describes the macroscopic evolution of a finite-size spin-flip model with k types of spins with arbitrary number of internal states interacting through a non-reversible stochastic dynamics. We are mostly interested on the multi-dimensional empirical-magnetization vector in the thermodynamic limit, and prove that, within arbitrary finite time-intervals, its path converges almost surely to a deterministic trajectory determined by a first-order (non-linear) differential equation with explicit bounds on the distance between the stochastic and deterministic trajectories. As parameters of the spin-flip dynamics change, the associated dynamical system may go through bifurcations, associated to phase transitions in the statistical mechanical setting. We present a simple example of spin-flip stochastic model, associated to a synthetic biology model known as repressilator, which leads to a dynamical system with Hopf and pitchfork bifurcations. Depending on the parameter values, the magnetization random path can either converge to a unique stable fixed point, converge to one of a pair of stable fixed points, or asymptotically evolve close to a deterministic orbit in Rk. We also discuss a simple signaling pathway related to cancer research, called p53 module.

On the Multiplicity of Orthogonal Geodesics in Riemannian Manifold With Concave Boundary. Applications to Brake Orbits and Homoclinics

Let (M, g) be a complete Riemannian Manifold, Omega subset of M an open subset whose closure is diffeomorphic to an annulus. If partial derivative Omega is smooth and it satisfies a strong concavity assumption, then it is possible to prove that there are at least two geometrically distinct geodesics in (Omega) over bar = Omega boolean OR partial derivative Omega starting orthogonally to one connected component of partial derivative Omega and arriving orthogonally onto the other one. The results given in [6] allow to obtain a proof of the existence of two distinct homoclinic orbits for an autonomous Lagrangian system emanating from a nondegenerate maximum point of the potential energy, and a proof of the existence of two distinct brake orbits for a. class of Hamiltonian systems. Under a further symmetry assumption, it is possible to show the existence of at least dim(M) pairs of geometrically distinct geodesics as above, brake orbits and homoclinics.

Solar Collectors for Historic Homes : Linking consumption to perceptions of space

Reduction of household energy consumption is one of the top issues in contemporary discussions on sustainable consumption. This chapter concerns one way through which consumption of purchased energy for house heating can be reduced; by having a solar thermal system added to one's house. However, the fact that one of the components - the solar collector - usually is situated on the roof or the facade of a building, is a recurrent impediment to such installations. In certain contexts, these attributes may melt into the building, while in others, they may be perceived as problematic. The latter may particularly be the case when the appearance of the building is of major imiportance, as with houses deemed worthy of preservation for coming generations. This chapter draws upon a study carried out in Visby Town, a walled Hanseatic town and a World Heritage site on the island of Gotland, Sweden.

Skicklig läs- och skrivundervisning i åk 1-3 : Om lärares möjligheter och hinder

This study focuses on teachers’ opportunities and obstacles to perform skillful reading and writing instruction. It’s about the ability to accurately identify where students are in their reading and writing process and to help them develop good reading skills. It is also about the ability to recognize signs of difficulties that students may have in their written language development and to know what efforts are needed to help them advance their reading and writing skills. The research is based on teachers’ own statements and survey responses on the external conditions for teaching and on their approach, attitudes and knowledge in reading and writing. The empirical material consists of interviews, surveys and test data. The interview study was conducted with eight teachers. The questionnaire was answered by 249 teachers, while the knowledge test was conducted of 269 teachers and 31 special education teachers. Many of the teachers in this study have lack knowledge in the structure of language and common Swedish spelling rules. Furthermore, it appears that a large part of them are unaccustomed to explaining, in detail, students’ reading development and find it difficult to systematically describe the aspects of daily literacy instruction. The overall picture is that many teachers teach without having tools to reflect on how their education really affects students’ reading and writing. These shortcomings make it difficult to conduct effective literacy instruction. Once students have learned to decode or if they have reading difficulties, many teachers seem to one-sidedly focus on getting students to read more. The consequence could be that those who would need to practice more on the technical basic of reading or comprehension strategies are left without support. Lack of variety and individuality in fluency and comprehension training can challenge the students’ reading and writing development. The teachers in the study, who have the old junior school teacher and elementary teacher education, have the highest amount of knowledge of reading and writing (the test). Good education can provide student teachers with professional skills that they may develop further in their careers. Knowledge of the meaning of phonological and phonemic awareness as well as knowledge of how to count phonemes seem to be important for knowledge of reading and writing (the test). Knowledge of basic reading processes can be obtained by systematic and structured work with students’ linguistic development, and through continuous dialogues with experienced colleagues on how and why questions. This is one important way to work also in teacher training. When essential professional skills are established in the teacher education, in practice students will obtain the school’s learning goals.

Streetwise Asia, a practical guide for the conservation and revitalisation of heritage cities and towns in Asia.

This is a practical and accessible guide for residents and professionals concerned to preserve and revitalise heritage cities in Asia. Heritage cities (many listed by UNESCO) are of course of major interest to one of the world's largest industries, tourism. Using inset colour photographs to complement the text, the realities of destructive and constructive development, repairs, restoration and usage are made clear. Legal, financial, administrative, historical and educational aspects of conservation policies, incentives and implementations are discussed. With outlines for strategy, goals and bibliography.

City-to-surf - a peer-to-peer model of on-line professional development: a collaborative mentoring model

This project explores the potential of electronic communications to support peer-to-peer interaction between separate whole-school communities as a means of providing both authentic, situated, professional development for teachers, concurrent with the development of enhanced student learning outcomes, and the intentional sharing of school 'culture'.  The intense use of telecommunications by both teacher and students in a 'many-to-many' manner provides rich opportunities for teachers to rethink their pedagogy, reconceptualise their classroom culture, and for students to see teachers as learners 'in situ'.  An extensive trial between two schools some 120km apart has demonstrated the basic functionality of the model.  This paper discusses the origins of the project, findings from the trial, and the nature of the changes to be made to the model to enhance its effects.

6,7-Dimethyl-5-phenyl-1H-thieno[2,3-e]-[1,4]diazepin-2(3H)-one

In the title molecule, C15H14N2OS, the seven-membered ring adopts a boat conformation. The carbonyl, imine and phenyl groups lie to one side of the molecule, and the thienyl ring and methylene group to the other.

'Aussies' and 'wogs' and the `group in-between': year 10 students' constructions of cross-cultural friendships

This paper reports on an aspect of a small, empirical study that explored how cross-category friendships were constructed among an ethnically diverse cohort of Year 10 students in an Australian school. The students, who self-identified as having friendships across gender and ethnic boundaries, were interviewed in focus groups. Young men and young women, in speaking of their cross-cultural friendships, generally stressed commonalities among rather than differences between groups of friends. Nevertheless, students identified two predominant peer groups and used the terms 'aussie' and 'wog' to name them. Some of the male students appeared to be more keen than many of the females to mark themselves out as belonging to one or the other of these groups. This paper will discuss how these terms are utilised among these students to construct particular identities. On one level, this naming signified differences of choice, with reference to styles of music, clothing, jewellery, hair and entertainment. Is this an attempt to reclaim and rework previously racist descriptors into more egalitarian terms by young people? The meanings and sense that students make of such traditionally racist terms and how their use reflects and challenges wider cultural discourses of difference are discussed. How 'sameness' is constituted around shared experiences rather than common cultural backgrounds is also considered.

Do you really want to ask an underwriter how much money you should leave on the table?

This paper analyses whether the owners of companies seeking to list will leave less money on the table if underwriters are employed to price and market the issue. Our findings indicate that limited liability and Industrial company initial public offerings (IPOs) that have used underwriters have left
more money on the table than those not employing underwriters. Not only is there a direct cost in employing an underwriter but this study suggests there might also be an indirect cost. We also find that a positive forecast earnings per share yield may be useful in reducing the amount of money left on the table.

In the service of the society: the labour management practices of an Australian life Insurer to 1940

This article considers the labour management practices in use in the Australian life insurance industry during the inter-war period. Using the Australian Mutual Provident as a case study, it is argued that the specific human resource management practices evolved to deal with separate sets of problems arising from the functions of the life insurance business and the manner in which the principal/agent problem was manifested. The differing nature of work associated with the sales and management of life insurance fostered the development of primary and secondary labour markets in which the benefits flowing to one were superior to those accruing to the other.

Teaching and learning in collaborative group design projects

The 200 years of apprentice/master tradition that underpins the atelier studio system is still at the core of much present-day architectural design education. Yet this tradition poses uncertainties for a large number of lecturers faced with changes in the funding of tertiary education. With reductions in one-to-one staff/student contact time, many educators are finding it increasingly difficult to maintain an atelier teaching model. If these deficiencies remain unchecked and design-based schools are unable to implement strategies to reduce the resource intensity of one-to-one studio teaching programmes, then, for many higher-education providers, current architectural education may be based on an untenable course structure. Rather than spreading their time thinly over a large number of individual projects, an increasing number of lecturers are setting group projects. This allows them to coordinate longer and more in-depth review sessions on a smaller number of assignment submissions. However, while the group model may reflect the realities of the design process in professional practice, the approach is not without shortcomings as a teaching and learning archetype for the assessment of individual student skill competencies. Hence, what is clear is the need for a readily adoptable andragogy for the teaching and assessment of group design projects. The following is a position paper that describes – with a focus on effective group structures and assemblage and fair assessment models – the background, methodology and early results of a Strategic Teaching and Learning Grant currently running at the School of Architecture and Building at Deakin University in Australia.

Establishing best-practice principles for the teaching of group design projects

As student-to-staff ratios escalate, increasing numbers of undergraduate architects are finding the reduction of ‘one-to-one’ studio supervision an impediment to learning. Group design projects are becoming a widespread solution to this problem. However, little analysis has been undertaken as to their effectiveness both in terms of student assessment and as a design teaching methodology.
The two hundred years of apprentice/master tradition that underpins the atelier studio system is still at the core of much present day architectural design education. Yet this tradition today poses uncertainties for a large number of co-ordinating lecturers faced with current changes in the nature of tertiary education and its funding structure. In particular, with reductions in staff/student contact time, in sessional funding sources and in the relative weighting of design-based subjects with respect to other subject areas, many design teachers are finding it increasingly difficult to maintain an atelier system that has shaped both their learning and, more pointedly, their teaching. If these deficiencies remain unchecked and design-based schools are unable to implement strategies that successfully overcome the resource intensive one-to-one teaching program, then architecture may prove to be an untenable course structure for many institutions.
Rather then spreading their time thinly, many co-ordinating lecturers are setting group projects in order to review less assignments but at greater depth. However, while this learning model better reflects design teams in practice, this approach may pose other pedagogical and assessment questions. What is clear is the urgent need for structured research into the teaching and assessment problems experienced by design teachers, and for a readily adoptable pedagogy for group design projects. At Deakin University, research is underway aimed at establishing best-practice principles for group design projects by analysing students’ performance and recording and implementing their feedback to adjustments made to the pedagogical fundamentals of assessment, group configuration, and program structure. There are after two years of preliminary studies already clear indications of what changes can be made to these to encourage more effective team learning. This paper will present the findings of these studies.

Market research effectiveness and strategy : the buyer's perspective

The study proposed that broad firm strategies should be related to the implementation and perceived performance of the market research function within the firm. The study involved a sample survey of market research buyers who evaluated their most recent market research project. It was found that specialist "market research" or "insights" managers believed market research to be more effective and to provide greater value than did buyers more generalist roles. It was found that the Prospector strategy firms were the most likely strategic group to rate their market research as effective. No relationships were found between the action-orientation or knowledge enhancing dimensions of the market research USER scale and business strategies, suggesting these dimensions aid all strategy types.