1,590 research outputs found
Oceans of Tomorrow sensor interoperability for in-situ ocean monitoring
The Oceans of Tomorrow (OoT) projects,
funded by the European Commission’s FP7 program, are
developing a new generation of sensors supporting physical,
biogeochemical and biological oceanographic monitoring.
The sensors range from acoustic to optical fluorometers to
labs on a chip. The result is that the outputs are diverse in a
variety of formats and communication methodologies. The
interfaces with platforms such as floats, gliders and cable
observatories are each different. Thus, sensorPeer ReviewedPostprint (author's final draft
Enseñar y aprender cálculo con ayuda de la vista gráfica 3D de GeoGebra
En este artĂculo se esbozan los fundamentos teĂłricos que sustentan la utilizaciĂłn de la vista gráfica 3D de GeoGebra como herramienta para la enseñanza y el aprendizaje del Cálculo Diferencial e Integral. TambiĂ©n se comparten algunas ideas, a modo de ejemplo, de construcciones que pueden realizarse para ayudar a comprender algunos conceptos que suelen resultar difĂciles para los alumnos, debido a la gran dificultad de representarlos gráficamente utilizando sĂłlo lápiz y papel, obligando al estudiante a limitarse a su manipulaciĂłn algebraica. Los ejemplos abordados se relacionan con los temas: sĂłlidos de revoluciĂłn, extremos relativos en funciones de dos variables y cálculo de lĂmites en funciones de dos variables
Seeking to enhance the bioenergy of municipal sludge: Effect of alkali pre-treatment and soluble organic matter supplementation
The aim of this research is to enhance the mesophilic anaerobic digestion of municipal sludge from
Cadiz-San Fernando (Spain) wastewater treatment plant at 20 days hydraulic retention time (HRT). Two
different strategies were tested to improve the process: co-digestion with the addition of soluble organic
matter (1% v/v); and alkali sludge pre-treatment (NaOH) prior to co-digestion with glycerine (1% v/v).
Methane production (MP) was substantially enhanced (from 0.36 ± 0.09 L CH4 l/d to 0.85 ± 0.16 L CH4
l/d), as was specific methane production (SMP) (from 0.20 ± 0.05 L CH4/g VS to 0.49 ± 0.09 L CH4/g VS)
when glycerine was added. The addition of glycerine does not seem to affect sludge stability, the
quality of the effluent in terms of pH and organic matter content, i.e. volatile fatty acids (VFA), soluble
organic matter and total volatile solid, or process stability (VFA/Alkalinity ratio < 0.4). Alkali
pre-treatment prior to co-digestion resulted in a high increase in soluble organic loading rates (more than
20%) and acidification yield (more than 50%). At 20 days HRT, however, it led to overload of the system and total destabilization of the mesophilic anaerobic co-digestion of sewage sludge and glycerine
Mesophilic anaerobic co-digestion of sewage sludge with glycerine: Effect of solids retention time
The main objective of this paper is to examine the effect of the increase in organic loading rates (OLRs), by
reducing the solids retention time (SRT) from 20 d to 5 d, in single-phase mesophilic anaerobic co-digestion of
sewage sludge with glycerine (1% v/v). It was experimentally confirmed that anaerobic co-digestion of these
biowastes under steady-state conditions can achieve an 85 ± 5% reduction in volatile fatty acids (VFA) at SRTs
of between 20 and 9 d, with a methane production yield of around 0.8 l CH4/l/d. Decreases in the SRT not only allow the sludge stability and biogas production to be maintained, but also lead to an increase in the waste that could be treated and lower operating costs. Therefore, mesophilic anaerobic co-digestion of sewage sludge and glycerin at a SRT lower than 20 d is possible and preferable due to being more economical and environmentally friendl
Optical fibers to measure temperature vertical profile at sea
The paper is focus in the use the optical fiber to measure the temperature
in various heigh at the same time to get a temperature vertical variation. The
temperature measurements are puntual while the Bragg gratings located in the
fiber.Peer Reviewe
Multilayer hazes over Saturn’s hexagon from Cassini ISS limb images
ProducciĂłn CientĂficaVer abstract
Applicability of bioengineered human skin: from preclinical skin humanized mouse models to clinical regenerative therapies
Ongoing progress in the field of regenerative medicine, in combination with the development of tissue-engineered skin products, has opened new possibilities for the treatment of certain diseases in which current treatments are aimed at alleviating symptoms but are not able to get a permanent cure. Our laboratory has developed a fibrin-based bioengineered human skin that has been successfully used for permanent regenerative therapies in different situations in the clinic. Moreover, we have been able to stably regenerate human skin by orthotopic grafting of this skin equivalent onto the back of immunodeficient mice. The so-called skin-humanized mouse model system has permitted us to model several monogenic skin diseases, when keratinocytes and fibroblasts harboring the genetic defect were used. In most cases different gene therapy approaches for ex vivo correction of cells have proved effective in reverting the phenotype using this model. More importantly, the feasibility of the system has allowed us to generate a skin humanized mouse model for psoriasis, a common chronic inflammatory disease where the immune component has a pivotal role in the pathogenesis. Establishing reliable humanized animal models for skin diseases is necessary to gain a deeper knowledge of the pathogenesis and to develop novel therapeutic strategies. In this sense, the skin humanized mouse model developed in our laboratory meets the needs of this field of research.This work was supported by grant SAF 2010-16976
Spanish Skate (Raja radiata Donovan, 1808) Fishery in the Grand Bank (NAFO Division 3N): 1997-2000.
The Spanish skate fishery in NAFO Regulatory Area is performed from August to November in a quite
restricted area of Div. 3N at depths between 51 and 100 m. Fishing effort, unstandardized catch rates, length
composition, sexual maturity, by-catch, discards and sex-ratios are presented in this paper.
The length range of thorny skate in the catches is mainly between 30 and 85 cm, with a mode of 50-51 cm. Both
sexes appeared equally represented in the catches. The main by-catch in this fishery is American plaice and
yellowtail flounder. A large proportion of mature males are observed
Some Aspects of the Thorny Skate (Raja radiata Donovan, 1808) Reproductive Biology in NAFO Division 3N Regulatory Area
Thorny skate samples from August to December 2000 were examined to determine both sexes maturity
stages, length at maturity and females potential fecundity. The size and number of the ovarian oocytes increase as
the maturation progress. In fully mature ovaries the average number of developed eggs is between 40 and 45 and its
final mean size is 12.5 mm. The minimum number of developing eggs per female found in the ovaries was 2 and the
maximum 88. Very few females at either the capsule extrusion or other of the active uterine stages have been found.
On the contrary most part of the adult males were at the fully mature stages, suggesting that the samples could be
taken on a mating aggregation season.
Using data from 1997, 1999 and 2000, both maturity ogives have been fitted. The females length at
maturity obtained ranged between 60 and 54 cm and that of the males between 43 and 51 cm
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