7,657 research outputs found
Rotação de culturas. XXIII. Efeitos das culturas de inverno sobre o rendimento de grãos e sobre algumas caracterÃsticas agronômicas de plantas de soja, num perÃodo de nove anos.
bitstream/item/133654/1/ID12354-1988-1989sojaresultados-p88-99.pdfTrabalho apresentado na XVII Reunião de Pesquisa de Soja da Região Sul, Porto Alegre, 1989
Factores Biomecânicos no Desenvolvimento de Patologias nos Membros Pélvicos em Avicultura Industrial
O crescente aparecimento de patologias nos membros pélvicos nos efectivos de frangos de carne e de perus, especialmente nas estirpes de crescimento rápido e de peso adulto elevado, que se traduzem em perdas económicas significativas, faz do estudo da biologia do osso, em particular das questões relacionadas com aspectos biomecânicos, uma área de primordial importância na indústria avÃcola. Pretende-se com a presente revisão evidenciar a associação que existe, em avicultura industrial, muito particularmente no sector da produção de carne, entre factores biomecânicos e o desenvolvimento de algumas patologias nos membros pélvicos
Crowdsmelling: The use of collective knowledge in code smells detection
Code smells are seen as major source of technical debt and, as such, should
be detected and removed. However, researchers argue that the subjectiveness of
the code smells detection process is a major hindrance to mitigate the problem
of smells-infected code. We proposed the crowdsmelling approach based on
supervised machine learning techniques, where the wisdom of the crowd (of
software developers) is used to collectively calibrate code smells detection
algorithms, thereby lessening the subjectivity issue. This paper presents the
results of a validation experiment for the crowdsmelling approach. In the
context of three consecutive years of a Software Engineering course, a total
"crowd" of around a hundred teams, with an average of three members each,
classified the presence of 3 code smells (Long Method, God Class, and Feature
Envy) in Java source code. These classifications were the basis of the oracles
used for training six machine learning algorithms. Over one hundred models were
generated and evaluated to determine which machine learning algorithms had the
best performance in detecting each of the aforementioned code smells. Good
performances were obtained for God Class detection (ROC=0.896 for Naive Bayes)
and Long Method detection (ROC=0.870 for AdaBoostM1), but much lower for
Feature Envy (ROC=0.570 for Random Forrest). Obtained results suggest that
crowdsmelling is a feasible approach for the detection of code smells, but
further validation experiments are required to cover more code smells and to
increase external validity
Code smells detection and visualization: A systematic literature review
Context: Code smells (CS) tend to compromise software quality and also demand more effort by developers to maintain and evolve the application throughout its life-cycle. They have long been cataloged with corresponding mitigating solutions called refactoring operations. Objective: This SLR has a twofold goal: the first is to identify the main code smells detection techniques and tools discussed in the literature, and the second is to analyze to which extent visual techniques have been applied to support the former. Method: Over 83 primary studies indexed in major scientific repositories were identified by our search string in this SLR. Then, following existing best practices for secondary studies, we applied inclusion/exclusion criteria to select the most relevant works, extract their features and classify them. Results: We found that the most commonly used approaches to code smells detection are search-based (30.1%), and metric-based (24.1%). Most of the studies (83.1%) use open-source software, with the Java language occupying the first position (77.1%). In terms of code smells, God Class (51.8%), Feature Envy (33.7%), and Long Method (26.5%) are the most covered ones. Machine learning techniques are used in 35% of the studies. Around 80% of the studies only detect code smells, without providing visualization techniques. In visualization-based approaches, several methods are used, such as city metaphors, 3D visualization techniques. Conclusions: We confirm that the detection of CS is a non-trivial task, and there is still a lot of work to be done in terms of: reducing the subjectivity associated with the definition and detection of CS; increasing the diversity of detected CS and of supported programming languages; constructing and sharing oracles and datasets to facilitate the replication of CS detection and visualization techniques validation experiments.info:eu-repo/semantics/acceptedVersio
Rotação de culturas. XXIV. Efeito das culturas de inverno sobre o rendimento de grãos e sobre algumas caracterÃsticas agronômicas de plantas de soja, num perÃodo de cinco anos.
bitstream/item/133651/1/ID12356-1988-1989sojaresultados-p100-115.pdfTrabalho apresentado na XVII Reunião de Pesquisa de Soja da Região Sul, Porto Alegre, 1989
Rotação de culturas e produtividade do trigo no RS.
PrincÃpios que orientam a rotação de culturas; Alternativas de inverno para a rotação de culturas; Rotação de culturas x clima; Rotação de culturas x manejo da área; Esquemas de rotação de culturas.bitstream/item/157862/1/FL-04190.pd
Assessing mercury mobility in sediment of the Union Canal, Scotland, UK by sequential extraction and thermal desorption
The mobility of mercury (Hg) was assessed in sediment from the Union Canal, Scotland, UK. Samples collected from the vicinity of a former munitions factory that manufactured mercury fulminate detonators were subjected to sequential extraction followed by cold vapor atomic absorption spectrometry (CVAAS) and direct analysis using thermal desorption (TD). The sequential extraction indicated that > 75% of mercury (up to 429 mg kg −1 ) was in mobile forms, with 67% of the total Hg content was desorbed in the temperature range 100–250 °C consistent with species weakly attached to the mineral matrix [tentatively identified as an iron (oxy)hydroxide-associated species]. This predominance of mobile mercury species may arise from a lack of association between Hg and either organic matter or sulfur in the sediments. Further investigation of Hg mobilization, transport, and assimilation/biomagnification is required both to determine whether there is a need for remediation of the sediment and to improve understanding of the biogeochemical cycling of Hg in shallow, oxic, freshwater systems
Code smells detection and visualization: A systematic literature review
Context: Code smells (CS) tend to compromise software quality and also demand
more effort by developers to maintain and evolve the application throughout its
life-cycle. They have long been catalogued with corresponding mitigating
solutions called refactoring operations. Objective: This SLR has a twofold
goal: the first is to identify the main code smells detection techniques and
tools discussed in the literature, and the second is to analyze to which extent
visual techniques have been applied to support the former. Method: Over 83
primary studies indexed in major scientific repositories were identified by our
search string in this SLR. Then, following existing best practices for
secondary studies, we applied inclusion/exclusion criteria to select the most
relevant works, extract their features and classify them. Results: We found
that the most commonly used approaches to code smells detection are
search-based (30.1%), and metric-based (24.1%). Most of the studies (83.1%) use
open-source software, with the Java language occupying the first position
(77.1%). In terms of code smells, God Class (51.8%), Feature Envy (33.7%), and
Long Method (26.5%) are the most covered ones. Machine learning techniques are
used in 35% of the studies. Around 80% of the studies only detect code smells,
without providing visualization techniques. In visualization-based approaches
several methods are used, such as: city metaphors, 3D visualization techniques.
Conclusions: We confirm that the detection of CS is a non trivial task, and
there is still a lot of work to be done in terms of: reducing the subjectivity
associated with the definition and detection of CS; increasing the diversity of
detected CS and of supported programming languages; constructing and sharing
oracles and datasets to facilitate the replication of CS detection and
visualization techniques validation experiments.Comment: submitted to ARC
Effects of different land use and land cover data on the landslide susceptibility zonation of road networks
This work evaluates the influence of land use and land cover (LUC) data with
different properties on the landslide susceptibility zonation of the road
network in the Zêzere watershed (Portugal). The information value method
was used to assess the landslide susceptibility using two models: one
including detailed LUC data (the Portuguese Land Cover Map – COS) and the
other including more generalized LUC data (the CORINE Land Cover – CLC). A
set of fixed independent layers was considered as landslide predisposing
factors (slope angle, slope aspect, slope curvature, slope-over-area ratio,
soil, and lithology) while COS and CLC were used to find the differences in
the landslide susceptibility zonation. A landslide inventory was used as a
dependent layer, including 259 shallow landslides obtained from the
photointerpretation of orthophotos from 2005, and further validated in three
sample areas. The landslide susceptibility maps were assigned to the road
network data and resulted in two landslide susceptibility road network maps.
The models' performance was evaluated with prediction and success rate curves
and the area under the curve (AUC). The landslide susceptibility results
obtained in the two models present a high accuracy in terms of the AUC
(>90 %), but the model with more detailed LUC data (COS)
produces better results in the landslide susceptibility zonation on the road
network with the highest landslide susceptibility.</p
Economic Impact of Prosthetic Joint Infection - an Evaluation Within the Portuguese National Health System
Introduction:
Prosthetic infection is a devastating complication of arthroplasty and carries significant economic burden. The objective of this study was to analyze the economic impact of prosthetic hip and knee infection in Portuguese National Health System.
Material and Methods:
Case-control study carried out from January 2014 to December 2015. The mean costs of primary arthroplasties and prosthetic revision surgeries for non-infectious reasons were compared with the costs of prosthetic infections treated with debridement and preservation of the prosthesis or with two-stage exchange arthroplasty.The reimbursement for these cases was also evaluated and compared with its real costs.
Results:
A total of 715 primary arthroplasties, 35 aseptic revisions, 16 surgical debridements and 15 revisions for infectious reasons were evaluated. The cost of primary arthroplasties was 3,230€ in the hips and 3,618€ in the knees. The cost of aseptic revision was 6,089€ in the hips and 7,985€ in the knees. In the cases treated with debridement and implant retention the cost was 5,528€ in the hips and 4,009€ in the knees. In cases of infections treated with a two-stage revision the cost was 11,415€ and 13,793€ for hips and knees, respectively.
Conclusion:
As far as we know this is the first study that analyzes the economic impact of prosthetic infection in the Portuguese context. Although direct compensation for treating infected cases is much lower than calculated costs, infected cases push the overall hospital case-mix-index upwards thus increasing financial compensation for the entire cohort of treated patients. This knowledge will allow for more informed decisions about health policies in the future.info:eu-repo/semantics/publishedVersio
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