Field Evaluation of Elliptical Fiber Reinforced Polymer Dowel Performance, June 2003

Fiber composite materials (FRP) are making an entry into the construction market in both buildings and pavements. The application to pavements comes in the form of joint reinforcement (dowels and tie bars) to date. FRP resistance to salt corrosion in dowels has made it an alternative to standard epoxy coated dowels for pavements. Iowa State University has completed a large amount of laboratory research into the determination of diameter, spacing, and durability of FRP dowels. This report documents the installation of a series of FRP elliptical-shaped dowel joints (including instrumented units) in a field situation and the beginning of a two-year study to compare laboratory results to in-service pavements. Ten joints were constructed for each of three dowel spacings of 10, 12, and 15 inches ( 254, 305, and 381 mm) with one instrumented joint in each test section. The instrumented bars will be load tested with a loaded truck and FWD testing.

Silver space-time trellis-coded modulation

Silver Code (SilC) was originally discovered in [1–4] for 2×2 multiple-input multiple-output (MIMO) transmission. It has non-vanishing minimum determinant 1/7, slightly lower than Golden code, but is fast-decodable, i.e., it allows reduced-complexity maximum likelihood decoding [5–7]. In this paper, we present a multidimensional trellis-coded modulation scheme for MIMO systems [11] based on set partitioning of the Silver Code, named Silver Space-Time Trellis Coded Modulation (SST-TCM). This lattice set partitioning is designed specifically to increase the minimum determinant. The branches of the outer trellis code are labeled with these partitions. Viterbi algorithm is applied for trellis decoding, while the branch metrics are computed by using a sphere-decoding algorithm. It is shown that the proposed SST-TCM performs very closely to the Golden Space-Time Trellis Coded Modulation (GST-TCM) scheme, yetwith a much reduced decoding complexity thanks to its fast-decoding property.

Multiuser detection with an unknown number of active users: receiver design

In multiuser detection, the set of users active at any time may be unknown to the receiver. In these conditions, optimum reception consists of detecting simultaneously the set of activeusers and their data, problem that can be solved exactly by applying random-set theory (RST) and Bayesian recursions (BR). However, implementation of optimum receivers may be limited by their complexity, which grows exponentially with the number of potential users. In this paper we examine three strategies leading to reduced-complexity receivers.In particular, we show how a simple approximation of BRs enables the use of Sphere Detection (SD) algorithm, whichexhibits satisfactory performance with limited complexity.

Occupational sex-composition and earnings : individual and social effects

This paper investigates the micro and macro-level factors affecting the empirical association between occupational sex-composition and individual earnings. This is done in two analytical steps using data from the second round of the European Social Survey. In a first step, country-fixed-effects regressions are used to test the extent to which job-specialization, gender attitudes and the relative supply of domestic work can account for the impact of occupational sex-composition on earnings. In accordance with previous research, it is found that all these micro-level variables have a significant effect on the analyzed association, yet only job-specialization can explain it away by itself. In a second analytical step, macro-level interactions are tested under the hypothesis that defamilialization policies reduce the pay-offs of sphere specialization by sex, generating incentives for all types of women to invest in the labor market. Empirical results suggest that gender attitudes and the relative supply of housework are much more loosely associated to earning in social-democratic and former communist societies than in conservative or liberal regimes. This finding is interpreted as consistent with the defamilialization hypothesis.

Tightening force and torque of nonlocking screws in a reverse shoulder prosthesis.

BACKGROUND: Reversed shoulder arthroplasty is an accepted treatment for glenohumeral arthritis associated to rotator cuff deficiency. For most reversed shoulder prostheses, the baseplate of the glenoid component is uncemented and its primary stability is provided by a central peg and peripheral screws. Because of the importance of the primary stability for a good osteo-integration of the baseplate, the optimal fixation of the screws is crucial. In particular, the amplitude of the tightening force of the nonlocking screws is clearly associated to this stability. Since this force is unknown, it is currently not accounted for in experimental or numerical analyses. Thus, the primary goal of this work is to measure this tightening force experimentally. In addition, the tightening torque was also measured, to estimate an optimal surgical value. METHODS: An experimental setup with an instrumented baseplate was developed to measure simultaneously the tightening force, tightening torque and screwing angle, of the nonlocking screws of the Aquealis reversed prosthesis. In addition, the amount of bone volume around each screw was measured with a micro-CT. Measurements were performed on 6 human cadaveric scapulae. FINDINGS: A statistically correlated relationship (p<0.05, R=0.83) was obtained between the maximal tightening force and the bone volume. The relationship between the tightening torque and the bone volume was not statistically significant. INTERPRETATION: The experimental relationship presented in this paper can be used in numerical analyses to improve the baseplate fixation in the glenoid bone.

Rehabilitation of Concrete Pavements Utilizing Rebblization and Crack and Seat Methods, June 2005

Deterioration in portland cement concrete (PCC) pavements can occur due to distresses caused by a combination of traffic loads and weather conditions. Hot mix asphalt (HMA) overlay is the most commonly used rehabilitation technique for such deteriorated PCC pavements. However, the performance of these HMA overlaid pavements is hindered due to the occurrence of reflective cracking, resulting in significant reduction of pavement serviceability. Various fractured slab techniques, including rubblization, crack and seat, and break and seat are used to minimize reflective cracking by reducing the slab action. However, the design of structural overlay thickness for cracked and seated and rubblized pavements is difficult as the resulting structure is neither a “true” rigid pavement nor a “true” flexible pavement. Existing design methodologies use the empirical procedures based on the AASHO Road Test conducted in 1961. But, the AASHO Road Test did not employ any fractured slab technique, and there are numerous limitations associated with extrapolating its results to HMA overlay thickness design for fractured PCC pavements. The main objective of this project is to develop a mechanistic-empirical (ME) design approach for the HMA overlay thickness design for fractured PCC pavements. In this design procedure, failure criteria such as the tensile strain at the bottom of HMA layer and the vertical compressive strain on the surface of subgrade are used to consider HMA fatigue and subgrade rutting, respectively. The developed ME design system is also implemented in a Visual Basic computer program. A partial validation of the design method with reference to an instrumented trial project (IA-141, Polk County) in Iowa is provided in this report. Tensile strain values at the bottom of the HMA layer collected from the FWD testing at this project site are in agreement with the results obtained from the developed computer program.

Social use of alcohol among adolescent offenders: a fundamental approach toward human needs

This study examined some basic health care approaches toward human needs, with a particular focus on nursing. We aimed to incorporate these approaches into the discussion of the mental health of adolescent offenders who consume alcohol. We discuss specific needs of the delinquent group, critique policies that prioritize coercion of adolescent offenders, and the role that nurses could play in the sphere of juvenile delinquency.

O ensino e a prática da contabilidade, orientado para o desenvolvimento de competências científicas, tecnológicas e relacionais

A dissertação que ora apresentamos visa a obtenção do grau de mestre no MBA - Gestão de Empresas, pelo ISCTE Business School, Departamento de Gestão. Intitulado o ensino e prática da Contabilidade, orientado para o desenvolvimento de competências científicas, tecnológicas e relacionais, este estudo foi desenvolvido para tentarmos perceber até que ponto o ensino da contabilidade, no instituto eleito para o efeito, corresponde às expectativas da profissão, atendendo às competências que o mercado, inserido num mundo global em constantes mutações, determina como fundamentais para o sucesso da carreira contabilística. Com novas necessidades em competências, na prática contabilística, resultantes da utilização das TICs, presentes em qualquer ramo da esfera humana, tentámos perceber se o currículo do Curso de Contabilidade, do instituto, está projectado para conferir, aos diplomados, competências do saber-saber, saber-fazer, e saber-ser, em conformidade com tais necessidades ou, pelo contrário, baseia-se numa perspectiva tradicional assente numa pedagogia por objectivos, encontrando-se desactualizado. Tratou-se de um estudo de caso, numa investigação qualitativa holística, que permitiu desenvolver compreensões a partir das evidências reunidas, das representações dos sujeitos sobre quem recaem os resultados da investigação, que estabelecem uma relação indirecta com os mesmos resultados. Dos resultados obtidos, percebemos que o currículo do Curso de Contabilidade não se adequa a um currículo baseado em competências, sendo inadequado à realidade contabilística actual, local e global. As conclusões chegadas permitem-nos defender uma revisão curricular do curso para adequá-lo às competências necessárias à garantia duma profissão de contabilista de sucesso. Como contributo, propomos um plano de estudos alternativo. The present dissertation aims at obtaining the master degree in MBA - Management, ISCTE Business School, Department of Management. Titled the teaching and practice of accounting, aimed at developing scientific, technology and relations competencies, this study was designed trying to realize the extent to which accounting education, at the institute elected for that, has met the expectations of the profession given the skills that the market, housed in a global world in constant change, establishes as fundamental to successful accounting career. With new skills needs in accounting practice, resulting from the use of ICT, present in any branch of the human sphere, we tried to see if the accounting course curriculum, of the institute, is designed to give graduates the skills of knowing how to know, knowing how to do and how to be or, conversely, is based on a traditional perspective based on a pedagogy by objectives, and is outdated. It was a case study, a holistic qualitative research, which allowed us to develop insights from the evidence gathered, the representations of the subjects on whom fall the results of research, establishing an indirect link with the same results. From our results, we find that the accounting course curriculum is not appropriate for a curriculum based on skills, and unsuited to current accounting practice, locally and globally. The conclusions reached allow us to defend a curriculum review of the course to suit the skills necessary to ensure a successful accountancy profession. As a contribution, we propose an alternative curriculum.

The role of primary care in the prevention and control of healthcare associated infections

Little research has been conducted to date on the role of primary health care (PHC) in the prevention of healthcare associated infections (HCAIs). The present article is a theoretical study of the principle of primum non nocere and aims to promote reflection on the role of PHC in HCAI prevention with emphasis on practical recommendations. The indirect and direct roles of PHC in HCAI prevention are debated in light of this guiding principle. With respect to the indirect role of PHC, we discuss the issues of hospital-centrism and ambulatory care-sensitive conditions. The article outlines a number of challenges faced by health services related to PHC’s direct role in HCAI prevention, highlights seven key components of HCAI prevention programmes within the PHC sphere and provides practical recommendations for HCAI control and prevention.


Development of appropriateness criteria for the surgical treatment of symptomatic lumbar degenerative spondylolisthesis (LDS).

PURPOSE: Spine surgery rates are increasing worldwide. Treatment failures are often attributed to poor patient selection and inappropriate treatment, but for many spinal disorders there is little consensus on the precise indications for surgery. With an aging population, more patients with lumbar degenerative spondylolisthesis (LDS) will present for surgery. The aim of this study was to develop criteria for the appropriateness of surgery in symptomatic LDS. METHODS: A systematic review was carried out to summarize the current level of evidence for the treatment of LDS. Clinical scenarios were generated comprising combinations of signs and symptoms in LDS and other relevant variables. Based on the systematic review and their own clinical experience, twelve multidisciplinary international experts rated each scenario on a 9-point scale (1 highly inappropriate, 9 highly appropriate) with respect to performing decompression only, fusion, and instrumented fusion. Surgery for each theoretical scenario was classified as appropriate, inappropriate, or uncertain based on the median ratings and disagreement in the ratings. RESULTS: 744 hypothetical scenarios were generated; overall, surgery (of some type) was rated appropriate in 27 %, uncertain in 41 % and inappropriate in 31 %. Frank panel disagreement was low (7 % scenarios). Face validity was shown by the logical relationship between each variable's subcategories and the appropriateness ratings, e.g., no/mild disability had a mean appropriateness rating of 2.3 ± 1.5, whereas the rating for moderate disability was 5.0 ± 1.6 and for severe disability, 6.6 ± 1.6. Similarly, the average rating for no/minimal neurological abnormality was 2.3 ± 1.5, increasing to 4.3 ± 2.4 for moderate and 5.9 ± 1.7 for severe abnormality. The three variables most likely (p < 0.0001) to be components of scenarios rated "appropriate" were: severe disability, no yellow flags, and severe neurological deficit. CONCLUSION: This is the first study to report criteria for determining candidacy for surgery in LDS developed by a multidisciplinary international panel using a validated method (RAM). The panel ratings followed logical clinical rationale, indicating good face validity. The work refines clinical classification and the phenotype of degenerative spondylolisthesis. The predictive validity of the criteria should be evaluated prospectively to examine whether patients treated "appropriately" have better clinical outcomes.

An Integral Abutment Bridge with Precast Concrete Piles, May 2007

The use of precast, prestressed concrete piles in the foundation of bridge piers has long been recognized as a valuable option for bridge owners and designers. However, the use of these precast, prestressed concrete piles in integral abutment bridges has not been widespread because of concerns over pile flexibility and the potential for concrete cracking and deterioration of the prestressing strands due to long-term exposure to moisture. This report presents the details of the first integral abutment bridge in the state of Iowa that utilized precast, prestressed concrete piles in the abutment. The bridge, which was constructed in Tama County in 2000, consists of a 110 ft. long, 30 ft. wide, single-span PC girder superstructure with a left-side-ahead 20º skew angle. The bridge was instrumented with a variety of strain gages, displacement sensors, and thermocouples to monitor and help in the assessment of structural behavior. The results of this monitoring are presented, and recommendations are made for future application of precast, prestressed concrete piles in integral abutment bridges. In addition to the structural monitoring data, this report presents the results of a survey questionnaire that had been mailed to each of the 50 state DOT chief bridge engineers to ascertain their current practices for precast, prestressed concrete piles and especially the application of these piles in integral abutment bridges.

A Percepção da População Local Sobre os Impactos Económicos do Turismo na Ilha de São Vicente

A actividade turística só faz sentido, e torna-se viável, quando se proporciona uma experiência qualitativa aos principais agentes envolvidos, isto é, quando haja a optimização da experiência turística, a conservação ambiental e cultural e a inclusão social, pela participação activa das comunidades locais. Assim, esta monografia debruça-se sobre a análise de um desses pilares, mais concretamente, a população local, e como tal, objectiva-se analisar a sua percepção sobre os impactos económicos do turismo no desenvolvimento da ilha de São Vicente. Contudo, para dar uma resposta coerente à problemática deste estudo, que é identificar os impactos económicos do turismo percebido pelos residentes, recorreu-se à uma abordagem económica do turismo, tendo em conta as nomenclaturas desenvolvidas no âmbito da Conta Satélite do Turismo. Na avaliação dos impactos, fez-se a aplicação de um inquérito por questionário, dirigido aos residentes das zonas de Norte Baía, Ribeira de Calhau, São Pedro e o Centro da Cidade. Definiu-se uma amostra representativa de 200 indivíduos, analisando a relação entre o turismo e um conjunto de variáveis económicas tais como o emprego, o rendimento, as receitas governamentais, as infra-estruturas, a sazonalidade, os investimentos, e a inflação. Pelos resultados obtidos, concluiu-se que o turismo contribui positivamente para aumentar o emprego, o rendimento, melhorar a qualidade de vida, o aparecimento de novas empresas, o aumento do Produto Interno Bruto e ainda contribui para o desenvolvimento económico da ilha. Contudo, os resultados permitiram concluir que a ilha não depende, do ponto de vista económico, exclusivamente do turismo. Touristic activity only makes sense and becomes profitable when it brings a qualitative experience to the parties involved, i.e. when it results in an improvement of the touristic experience, with an environmental and cultural protection and social inclusion, through the active participation of the local communities, we developed this monograph based on the analysis of the people´s perception about the economic impact of the tourism in the development of São Vicente island. However, in order to have a coherent answer to the issues this document is concerned with, i.e to identify the economic impact of the tourism on people´s live, we went through an economic approach of the tourism, taking in consideration the nomenclature developed in the sphere of Tourism Satellite Account. For the evaluation of the impact we resorted to an enquiry to the residents of Norte Baía, Ribeira de Calhau, São Pedro, and Mindelo. A representative sample of 200 individuals has been defined, to analyze the relationship between the tourism itself and several economic targets, such as: employment, profits, infrastructure, season, investment, inflation. According to the analysis we concluded that the tourism has positively contributed to the uprising of new enterprise, to the increasing of the gross domestic product, to rise up the employment rate, to increase family´s incomes and consequently a better life quality and also to the economic development of São Vicente Island. Nevertheless we also concluded that economically São Vicente does not depend only on the tourism incomes.

Nationalisme économique et réalisme mercantile : la politique énergétique russe sous Poutine (2000-2008)

Mon travail met en évidence la restructuration de l'industrie énergétique russe sous les deux mandats Poutine (2000-2008) via le rôle prédominant de l'État dans une perspective historique. Une nouvelle élite politique russe (les Silovikis) issue des structures de force de l'Etat favorise le nationalisme économique axé sur le rétablissement de l'autorité du gouvernement central au sein de l'industrie énergétique nationale au détriment des pouvoirs régionaux, des sociétés privées étrangères et des oligarques indépendants. Dans cette perspective, on peut citer "l'affaire Youkos" en 2003 caractérisée par l'arrestation de l'oligarque Mikhaïl Khodorkhovsky; les tentatives silovikiennes de reprendre l'ascendant sur les compagnies pétrolières régionales Tatneft et Bachneft gérées par les gouvernements tatar et bachkir, la pression fiscale envers les majors pétrolières étrangères à l'instar du conflit russo- britannique relatif à la joint-venture TNK-BP. Quant à la politique énergétique étrangère russe, elle est inspirée par line vision réaliste mercantile; le gouvernement silovikien vise à défendre l'intérêt national, le prestige et la puissance de la Russie via ses "champions" énergétiques Rosneft et Gazprom utilisés comme levier politique, notamment à l'égard des pays de la CEI considéré par Moscou comme sa sphère d'influence historique. Dans cette perspective, nous pouvons mentionner l'interruption des approvisionnements pétroliers et gaziers russes à l'Ukraine, aux Etats baltes ou encore à la Géorgie; la concurrence entre les majors russes et étrangères en Asie centrale / Caucase pour les champs pétrolifères et les tracés de pipelines (nouveau «Grand Jeu»); la diversification des marchés russes à l'exportation à travers la promotion de nouveaux pipelines partant des champs pétrolifères sibériens vers la Chine et l'océan Pacifique.¦My work highlights the restructuration of the Russian energy industry under the 2 Putin madates (2000-2008) by the predominant role of the state in a historical perspective. A new Russian politic elite (Siloviki) from state structure forces promotes the economic nationalism focused on the reestablishment of the central governmental authority in the national energy industry against regional powers, private foreign companies and independent oligarchs. In this perspective, we can mention the "Yukos Affair" in 2003 with the arrest of the oligarch Mikhail Khodorkhovsky; the silovikian attempts to take over the regional oil companies Tatneft and Bachneft handled by the Tatar and Bashkir governments; the fiscal silovikian pressure against foreign companies such as the Russo-Britannic joint- venture TNK-BP. As for the Russian energy Foreign policy, it is inspired by a mercantile realism vision; the silovikian government aims to defend the national interest, the prestige and the power of Russia through its energy companies Rosneft and Gazprom as a political leverage especially toward the CEI Countries considered by Moscow as it historical sphere of influence. In this perspective, we can mention the interruption of Russian oil&gas supply toward Ukraine, Baltic states or Georgia; the competition between Russian and foreign companies in Central Asia/Caucasus for oil and gas fields and pipeline routes (new "Great Game"); the diversification of Russian export markets through the promotion ο new pipelines from Siberian oil&gas fields to China and the Pacific Ocean.

Comunidade política, imigração e coesão social: o caso português

This work contributes to an understanding of how the existence of multiple ethnic- cultural belongings in the political community concurs with the maintenance of a socially cohesive and politically united community. Considering the immigration reality in Portugal, we tried to identify the bonds that link immigrants to the political community and how those bonds can be mobilized to integrate immigrants in a common living project inside the national territory. Methodologically, this investigation is based in a qualitative and quantitative analysis of the policies and measures applied in Portugal in the immigration sphere, as well as the results of the empirical work we carried out with two immigration groups (Brazilians and Cape Verdeans) living in Lisbon’s metropolitan area, and the answers to a survey we sent to immigrant associations. The results of this research revealed the existence of a certain political ambivalence concerning the immigrant integration process, which expresses itself to a certain degree in the way national citizens and immigrants appraise the immigrant contribution to Portuguese society. The prevailing and blurred idea states that immigration expenses don’t make up for the benefits, and that is likely to influence the mutual relationship established between the two. Despite the existence of objective situations of social and economic disparity and despite a feeling of discrimination shared between immigrants, it is possible to identify a progressive citizenship universalization and the formal acceptance of immigrant religious and cultural traditions, even though the Portuguese parliament does not reflect such diversity. Thus, we perceive the possibility of warranting specific ethnic and cultural minority rights without the ethnicization or culturalization of political representation, and the general standards that serve as a backbone to the national political community might be enough to warrant that protection. Notwithstanding, some signs suggest that immigrant access to public sphere might not be easy, and this might have repercussions in the visibility and in the public discussion of demands, with outcomes on the type of integration policies Portugal applies.