On the sustainability of web systems evolution

In the last twenty years, the evolution of web systems has been driven along three dimensions: the processes used to develop, evolve, maintain and re-engineer the systems themselves; the end products (the pages, content and links) of such processes; and finally the people dimension, with the extraordinary shift in how developers and users shape, interact and maintain the code and content that they put online. This paper reviews the questions that each of these dimensions has addressed in the past, and indicates which ones will need to be addressed in the future, in order for web system evolution to be sustainable. We show that the study on websites evolution has shifted from server- to client-side, focusing on better technologies and processes, and that the users becoming creators of content open several open questions, in particular the issue of credibility of the content created and the sustainability of such resources in the long term

Postanesthetic Severe Oral Angioedema in Patient's Taking Angiotensin-Converting Enzyme Inhibitor

Angiotensin-converting enzyme (ACE) inhibitors are the leading cause of a drug-induced angioedema. This occurrence is frequently underdiagnosed, but its relapse can be life-threatening. The authors' intention in reporting this clinical case is to sound a warning about reviewing attitudes and surveillance to try to improve patient perioperative safety

The SIMPLE Phase II Dark Matter Search

Phase II of SIMPLE (Superheated Instrument for Massive ParticLe Experiments) searched for astroparticle dark matter using superheated liquid C$_{2}$ClF$_{5}$ droplet detectors. Each droplet generally requires an energy deposition with linear energy transfer (LET) $\gtrsim$ 150 keV/$\mu$m for a liquid-to-gas phase transition, providing an intrinsic rejection against minimum ionizing particles of order 10$^{-10}$, and reducing the backgrounds to primarily $\alpha$ and neutron-induced recoil events. The droplet phase transition generates a millimetric-sized gas bubble which is recorded by acoustic means. We describe the SIMPLE detectors, their acoustic instrumentation, and the characterizations, signal analysis and data selection which yield a particle-induced, "true nucleation" event detection efficiency of better than 97% at a 95% C.L. The recoil-$\alpha$ event discrimination, determined using detectors first irradiated with neutrons and then doped with alpha emitters, provides a recoil identification of better than 99%; it differs from those of COUPP and PICASSO primarily as a result of their different liquids with lower critical LETs. The science measurements, comprising two shielded arrays of fifteen detectors each and a total exposure of 27.77 kgd, are detailed. Removal of the 1.94 kgd Stage 1 installation period data, which had previously been mistakenly included in the data, reduces the science exposure from 20.18 to 18.24 kgd and provides new contour minima of $\sigma_{p}$ = 4.3 $\times$ 10$^{-3}$ pb at 35 GeV/c$^{2}$ in the spin-dependent sector of WIMP-proton interactions and $\sigma_{N}$ = 3.6 $\times$ 10$^{-6}$ pb at 35 GeV/c$^{2}$ in the spin-independent sector. These results are examined with respect to the fluorine spin and halo parameters used in the previous data analysis.Comment: 20 pages, 19 figures; accepted Physical Review

A paradigm shift in risk management in public–private partnership arrangements

This research sought to determine how public-private partnership (PPP) arrangements can more efficiently address risk management issues using the example of Mozambique as a case study. Analyses of 15 interviews in this country were conducted using the Gioia methodology. The results indicate that integrating key risk indicators into PPP contracts can improve risk management. These measures have been widely used in company risk management. The indicators can serve as monitoring, reviewing and supervising tools, allowing the integration of external factors into PPP contracts at the right time, which is hard to predict when the contracts are signed. Key risk indicators can capture megatrends, track risk evolution and develop future scenarios throughout the entire lifecycle of contracts, preventing conflicts between partners, contract renegotiations or early contract terminations by facilitating an improved understanding of contracts' current realities. The findings suggest that these measures should be applied by PPP units. The proposed approach encourages originality and empirical research-based improvements of PPP risk management frameworks and provides guidelines for future studies.info:eu-repo/semantics/publishedVersio

Variabilidade genética em muçuã utilizando marcadores moleculares RAPD.

O muçuã (Kinosternon scorpioides) é uma espécie de extrema importância econômica no Estado do Pará, sendo indispensáveis estudos que viabilizem sua conservação e sua caracterização genética, a fim de direcionar programas de melhoramento nessa espécie e o monitoramento da sua variabilidade. O objetivo foi avaliar a variabilidade genética existente em populações de Kinosternon scorpioides do Banco de Germoplasma Animal da Amazônia Oriental (BAGAM), localizado em Salvaterra, na ilha de Marajó, no Estado do Pará, a fim de realizar uma caracterização molecular inicial da espécie. Foram utilizados marcadores moleculares RAPD (Polimorfismos de DNA Amplificados ao Acaso). Para tanto, foram obtidas amostras de DNA a partir de sangue total de 39 indivíduos de diferentes populações. A seleção de primers foi realizada a partir de um screening de quatro kits (kit OPA, OPU, OPJ, OPM), dos quais foram selecionados os doze mais polimórficos, que geraram bandas no intervalo de três a oito, viáveis para utilização. A análise de similaridade genética foi realizada com 53 marcadores RAPD, no programa NTSYS-pc, 2.0 utilizando o coeficiente de Jaccard. A partir dos dados gerados pela UPGMA (Unweighted Pair Group Method with Arithmetic Mean), pôde-se dimensionar a variabilidade existente entre os mesmos. Foram obtidos intervalos de similaridade genética variando de 3-98%, sendo que os indivíduos mais divergentes foram o M8 e o M14 com o M33 (0,03) e os mais similares, os genótipos M3 e o M4 (0,98). Os resultados indicaram a existência de variabilidade genética a ser explorada na espécie, tanto para programas de melhoramento genético como para a conservação da mesm

Quantum Fields with Noncommutative Target Spaces

Quantum field theories (QFT's) on noncommutative spacetimes are currently under intensive study. Usually such theories have world sheet noncommutativity. In the present work, instead, we study QFT's with commutative world sheet and noncommutative target space. Such noncommutativity can be interpreted in terms of twisted statistics and is related to earlier work of Oeckl [1], and others [2,3,4,5,6,7,8]. The twisted spectra of their free Hamiltonians has been found earlier by Carmona et al [9,10]. We review their derivation and then compute the partition function of one such typical theory. It leads to a deformed black body spectrum, which is analysed in detail. The difference between the usual and the deformed black body spectrum appears in the region of high frequencies. Therefore we expect that the deformed black body radiation may potentially be used to compute a GZK cut-off which will depend on the noncommutative parameter $\theta$.Comment: 20 pages, 5 figures; Abstract changed. Changes and corrections in the text. References adde