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Department of Life Sciences
616
Total Impact Points
205
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Faculty of Psychology and Education Sciences
198
Total Impact Points
168
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Department of Civil Engineering
338
Total Impact Points
168
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Publication History View all

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    ABSTRACT: Reservationless computer communication networks based on the best effort paradigm are no longer capable of providing the quality of service necessary for the new generation of computer communication services, such as voice, video and multimedia services. These new services and their users have very different communication needs, and must not be treated equal by the communication system. Quality of service (QoS) specification on a per communication service basis, and quality of service guarantee by reservation-oriented communication systems are the key solutions for the support of new age information systems. QoS specification requires service characterization based on a set of QoS parameters that, on one hand, is rich enough to accommodate service and traffic dynamics and, on the other hand, is simple and flexible enough to allow the implementation of an efficient reservation policy. QoS guarantee by reservation-oriented communication systems can only be achieved by the deployment of new congestion control functions that can prevent service degradation and -based on a quantification scheme -be used to evaluate the network in terms of QoS performance and available capability.
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    ABSTRACT: The dynamics of indoor environmental conditions, human occupancy, and operational characteristics of buildings influence human comfort and indoor environmental quality, including the survival and progression of microbial communities. A suite of continuous, long-term environmental and operational parameters were measured in ten patient rooms and two nurse stations in a new hospital building in Chicago, IL to characterize the indoor environment in which microbial samples were taken for the Hospital Microbiome Project. Measurements included environmental conditions (indoor dry-bulb temperature, relative humidity, humidity ratio, and illuminance) in the patient rooms and nurse stations; differential pressure between the patient rooms and hallways; surrogate measures for human occupancy and activity in the patient rooms using both indoor air CO2 concentrations and infrared doorway beam-break counters; and outdoor air fractions in the heating, ventilating, and air-conditioning systems serving the sampled spaces. Measurements were made at 5-minute intervals over consecutive days for nearly one year, providing a total of ∼8×106 data points. Indoor temperature, illuminance, and human occupancy/activity were all weakly correlated between rooms, while relative humidity, humidity ratio, and outdoor air fractions showed strong temporal (seasonal) patterns and strong spatial correlations between rooms. Differential pressure measurements confirmed that all patient rooms were operated at neutral pressure. The patient rooms averaged about 100 combined entrances and exits per day, which suggests they were relatively lightly occupied compared to higher traffic environments (e.g., retail buildings) and more similar to lower traffic office environments. There were also clear differences in several environmental parameters before and after the hospital was occupied with patients and staff. Characterizing and understanding factors that influence these building dynamics is vital for hospital environments, where they can impact patient health and the survival and spread of healthcare associated infections.
    PLoS ONE 03/2015; 10(3). DOI:10.1371/journal.pone.0118207
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    ABSTRACT: Contaminant-induced feeding inhibition has direct and immediate consequences at higher levels of biological organization, by depressing the population consumption and thus hampering ecosystem functioning (e.g. grazing, organic matter decomposition). Thus, similarly to lethality and avoidance, feeding is mechanistically linked to ecosystem processes and is therefore an unequivocal ecologically meaningful response. The objective of the present study was to develop a short-term assay with the small freshwater fish Danio rerio, based on feeding. For this, a methodology to easily and precisely quantify feeding was first optimized: each fish was allowed to prey on ten live Daphnia magna juveniles, for 1h, just before the end of a 48-h exposure test period. Secondly, copper sensitivity of feeding relatively to survival and growth was evaluated. At the growth EC20 (40μgL(-1)), feeding was inhibited by 53%, and at the feeding EC50 (36μgL(-1)), mortality was negligible (1.3%). Integrating feeding and survival revealed a 97% depression in the population consumption at the LC50 (61μgL(-1)). Thirdly, the influence of pH, conductivity and hardness on the feeding background variability was assessed by assaying waters collected at eight reference sites and was found to be negligible, within tested ranges. Fourthly, feeding assays with natural waters contaminated with acid mine drainage confirmed the integration of lethality and feeding to be pertinent at estimating contaminant effects at higher levels of biological organization. Copyright © 2014 Elsevier Ltd. All rights reserved.
    Chemosphere 02/2015; 120:568-74. DOI:10.1016/j.chemosphere.2014.09.083

Information

  • Address
    Praceta Mota Pinto, 3000-075, Coimbra, Portugal
  • Head of Institution
    Américo Figueiredo
  • Website
    http://www.uc.pt/
  • Phone
    +351239400420
  • Fax
    +351239400490
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Top publications last week by downloads

 
Global Ecology and Biogeography 06/2015; DOI:10.1111/geb.12315
137 Downloads
 
Computer 02/2014; 47(2):30-36. DOI:10.1109/MC.2013.409
125 Downloads

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