Vicente Estruch | Universitat Politècnica de València (original) (raw)

Papers by Vicente Estruch

Urban Forestry & Urban Greening, 2015

ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homot... more ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homotomidae) on Ficus microcarpa L. in Valencia (Spain) were studied in 2013. During the study, all immature instars of the pest were found on infested shoots indicating overlapping generations. However, two consistent increases in the proportion of the first two nymphal instars were detected in early March and June, possibly suggesting the beginning of spring and summer generations. Eggs of M. gladiata were usually found below the stipules of new healthy shoots, arranged in groups of 15-30 units. First two nymphal instars usually preferred the innermost part of the shoot, whereas the older developmental stages were localised more externally. The abundance of pest population increased in February-April and lowered from May onward. A number of other pest species were collected on the sampled trees. These included: Gynaikothrips ficorum (Marchal) (Thysanoptera, Phlaeothripidae), Pseudococcus longispinus(TargioniTozzetti) (Hemiptera, Pseudococcidae) and Greenidea ficicola Takahashi (Hemiptera: Aphididae). Unlike M. gladiata, the populations of these insects on shoots remained high from May onward. Among natural enemies of the invasive pest, Prionomitus mitratus (Dalman) (Hymenoptera, Encyrtidae) and Anthocoris nemoralis (Fabricius) (Hemiptera, Anthocoridae) were the most abundant. The encyrtid is here reported for the first time as a parasitoid of M. gladiata. Its presence was constant all along the study period, with a peak in May and June and an apparent preference for the older instars (third to fifth nymph stages) was recorded. In an attempt to indicate a possible remedy to the heavy infestations of M. gladiata, and considering the urban location of the sampled trees, two pesticides, a paraffin and a botanical oil, were tested. Treatments significantly reduced the population of the psyllid. The botanical oil resulted more effective than paraffin oil in reducing the number of the first two nymphal instars, regardless their innermost position on infested shoots.

Acoustics is the basics of the most important technologies for underwater telecommunication, as w... more Acoustics is the basics of the most important technologies for underwater telecommunication, as well as for target detection and identification in the aquatic media. Multiple frequency measurements are the key for species discrimination and open the door for sustainable fisheries. The development of wider broadband systems and quantitative multi-beam sonars and processing techniques constitute the present challenge for scientists and developers. In parallel, simpler and cost-efficient systems like satellite buoys can offer clue information for marine ecosystem monitoring or target species fisheries.

The study presented in this paper belongs to a more general project of research focused in the in... more The study presented in this paper belongs to a more general project of research focused in the influence of technology (Tics) in the comprehension of basic nocions in calculus. More particulary, in this paper we will show a set of activities to be developed in Matlab in the context of environmental sciences studies and in the constructivism theoretical framework of Action-Process-Object and Scheme (Apos)

En la Comunidad Valenciana se producen numerosos incendios forestales especialmente en los meses ... more En la Comunidad Valenciana se producen numerosos incendios forestales especialmente en los meses de verano, afectando principalmente a pino blanco (Pinus halepensis Mill), que es la especie más abundante en nuestros montes. Se ha realizado el seguimiento de pinos parcialmente afectados por el fuego en dos incendios que se produjeron en agosto de 2007 y julio de 2009. En estos árboles se midieron una serie de parámetros (altura del árbol, altura del fuste, diámetro normal, diámetro basal, espesor de corteza, altura del fuste y altura del árbol afectadas por el fuego, porcentaje de copa quemada y porcentaje del diámetro normal quemado) y se siguió la evolución de los mismos hasta el otoño siguiente al incendio, anotando los árboles muertos y los que sobrevivieron. Se ha realizado un análisis factorial por el método de las componentes principales para las variables analizadas. Los resultados del análisis indican que es posible predecir la mortalidad post- incendio en P. halepensis basá...

Revista Latinoamericana de Investigación en Matemática Educativa

The purpose of this research is to characterize the development of the scheme for the integral as... more The purpose of this research is to characterize the development of the scheme for the integral as defined by earth science engineering students using fuzzy metrics in order to establish the level of development on intra, inter and trans levels (Piaget & García, 1984). The results demonstrate the difficulty of students to link the succession of Riemann sums with their dependence on the n value of the partition, as a manifestation of the relationship between the succession of Riemann sums and the step to the limit which forms the meaning of the defined integral.

We give an example of the gradation of openness (a fuzzy topology in Shostak’s sense) and deduce ... more We give an example of the gradation of openness (a fuzzy topology in Shostak’s sense) and deduce from it a pseudo-measure of fuzziness.

Generalized discrete-time periodic linear systems are important and useful in system modelling. T... more Generalized discrete-time periodic linear systems are important and useful in system modelling. This kind of systems can be approached in the frecuency domain by a periodic collection of nonproper rational matrices. Periodic controllers are usually represented by transfer matrices but real-time operations require the controllers to be implemented as periodic systems [2]. The study of the model requires the implementation of the controllers as minimal dimension periodic linear systems in the sense of having the minimal number of states at each time. It is not difficult to obtain a periodic forward/backward realization of the periodic collection of nonproper rational matrices [1], but is is not clear how to remove the extra or redundant states in the realization. In [1] the realization problem is studied in the case of nonproper rational matrices and it is proved that, under certain conditions, there exists a minimal forward/backward discrete time-varying linear periodic realization o...

We prove a fixed fuzzy point theorem for fuzzy contrac-tion mappings (in the S. Heilpern's se... more We prove a fixed fuzzy point theorem for fuzzy contrac-tion mappings (in the S. Heilpern's sense) over a complete metric space, and as a consequence we obtain a fixed point theorem in the context of intuitionistic fuzzy sets.

Random two-parameter TGC growth model A mathematical model to simulate fish growth is presented, ... more Random two-parameter TGC growth model A mathematical model to simulate fish growth is presented, based on the model proposed by Cho (1992), which had only one parameter: the thermal growth coefficient (TGC). Our new model's fundamental differ- ence is the consideration of a second parameter, which makes it possible to factor out the impact of tempera- ture and other factors on fish growth. The proposed model enables us to consider temperature and starting weight as random variables, and has been implemented in a computer program using the Matlab mathemat- ical package.

Applied General Topology

We give a new concept of fuzzy topological subspace, which extends the usual one and study in it ... more We give a new concept of fuzzy topological subspace, which extends the usual one and study in it the related concepts of interior, closure and connectedness

Length-weight (L-W) relationships are important parameters in Atlantic bluefin tuna (Thunnus thyn... more Length-weight (L-W) relationships are important parameters in Atlantic bluefin tuna (Thunnus thynnus L) (ABFT) stock assessments. Some datasets used to determine L-W relationships contain outliers which may significantly affect the accuracy of these L-W relationship and other parameters utilised during stock assessments. A method is proposed to filter out these outliers and provide more meaningful L-W relationships. This method is based on the application of the Tukey’s Outlier method on the Fulton’s Condition Factor (K) data derived from available fork length (FL) and round weight (RWT) data. In this paper Tukey’s Outlier method was applied to K data derived from the FLs and RWTs of eight Atlantic bluefin tuna datasets from both wild and farmed Atlantic bluefin tuna. Lower and upper filtering limits were used to filter out outlying FL and RWT data points in the original datasets to determine new L-W relationships. It was shown that applying Tukey’s Outlier filtering procedure signi...

Reviews in Fisheries Science, 2014

ABSTRACT The growth equation currently used for Atlantic bluefin tuna, Thunnus thynnus (L.), east... more ABSTRACT The growth equation currently used for Atlantic bluefin tuna, Thunnus thynnus (L.), eastern stock (Lt = 318.85 [1-e^(-0.093*(t + 0.97)) is validated using several approaches. The first method involved a comparison of studies with von Bertalanffy parameter estimates in which, different methods for the age estimation are utilized, taking as references the maximum size of this species (Lmax = 319.93 +- 11.3 cm) and the growth equation of the western Atlantic stock (Lt = 314.90 [1-e ^(0.089* (t+1.13)). The result of this analysis showed that the growth equation used by ICCAT’s Standing Committee on Research and Statistics Atlantic bluefin tuna assessment group for the eastern stock perfectly fits Lmax. Second, an analysis was realized from first dorsal spine rings, 578 samples (age groups 0 to 3) of ABFT collected from the Bay of Biscay and the Mediterranean Sea, enabled the interpretation of the wide opaque bands (fast growth), formed during the boreal late spring and completed by autumn (June to November), and the translucent rings (hyaline rings, slow growth), formed during boreal autumn to late spring (November to May-June). In addition, first dorsal spine sections bands of two recovered fish that had carried conventional and electronic archival tags are also consistent. The chronological analysis of the opaque bands and hyaline rings of one fish tagged with an archival tag and recovered in the Bay of Biscay (the first time such a spine had been available for such analysis) revealed that transatlantic migrations may lead to double hyaline ring formation in the spine. Finally, the validation of the ABFT growth equation is made by superimposing tag-recovery data from tagging surveys in the Bay of Biscay, western Mediterranean and western Atlantic (N = 131) and spine readings (N = 299) to the eastern stock ABFT growth equation and analysing residuals. The coefficient of determination (R^2 = 97.98) and the residual’s distribution indicated good performance of the model. Although no important differences between the growth model of the eastern stock and that of the western stock are found, in all cases studied, the predictive accuracy indicators are better for the eastern model.

Multidisciplinary Journal for Education, Social and Technological Sciences, 2014

The student who access the University understands a curve as a function represented by an equalit... more The student who access the University understands a curve as a function represented by an equality involving the Cartesian variables x and y. But he does not know another great set of curves such as those described by parametric equations and polar coordinates. We show an experience developed in two consecutive courses in the first course of a bachelor's degree, which allows the students to discover and create many curves in parametric or polar representation, working in group. Also the experience facilitate the students to achieve several generic skills.

Modelling in Science Education and Learning, 2014

Urban Forestry & Urban Greening, 2015

ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homot... more ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homotomidae) on Ficus microcarpa L. in Valencia (Spain) were studied in 2013. During the study, all immature instars of the pest were found on infested shoots indicating overlapping generations. However, two consistent increases in the proportion of the first two nymphal instars were detected in early March and June, possibly suggesting the beginning of spring and summer generations. Eggs of M. gladiata were usually found below the stipules of new healthy shoots, arranged in groups of 15-30 units. First two nymphal instars usually preferred the innermost part of the shoot, whereas the older developmental stages were localised more externally. The abundance of pest population increased in February-April and lowered from May onward. A number of other pest species were collected on the sampled trees. These included: Gynaikothrips ficorum (Marchal) (Thysanoptera, Phlaeothripidae), Pseudococcus longispinus(TargioniTozzetti) (Hemiptera, Pseudococcidae) and Greenidea ficicola Takahashi (Hemiptera: Aphididae). Unlike M. gladiata, the populations of these insects on shoots remained high from May onward. Among natural enemies of the invasive pest, Prionomitus mitratus (Dalman) (Hymenoptera, Encyrtidae) and Anthocoris nemoralis (Fabricius) (Hemiptera, Anthocoridae) were the most abundant. The encyrtid is here reported for the first time as a parasitoid of M. gladiata. Its presence was constant all along the study period, with a peak in May and June and an apparent preference for the older instars (third to fifth nymph stages) was recorded. In an attempt to indicate a possible remedy to the heavy infestations of M. gladiata, and considering the urban location of the sampled trees, two pesticides, a paraffin and a botanical oil, were tested. Treatments significantly reduced the population of the psyllid. The botanical oil resulted more effective than paraffin oil in reducing the number of the first two nymphal instars, regardless their innermost position on infested shoots.

Reviews in Fisheries Science, 2013

Urban Forestry & Urban Greening, 2015

ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homot... more ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homotomidae) on Ficus microcarpa L. in Valencia (Spain) were studied in 2013. During the study, all immature instars of the pest were found on infested shoots indicating overlapping generations. However, two consistent increases in the proportion of the first two nymphal instars were detected in early March and June, possibly suggesting the beginning of spring and summer generations. Eggs of M. gladiata were usually found below the stipules of new healthy shoots, arranged in groups of 15-30 units. First two nymphal instars usually preferred the innermost part of the shoot, whereas the older developmental stages were localised more externally. The abundance of pest population increased in February-April and lowered from May onward. A number of other pest species were collected on the sampled trees. These included: Gynaikothrips ficorum (Marchal) (Thysanoptera, Phlaeothripidae), Pseudococcus longispinus(TargioniTozzetti) (Hemiptera, Pseudococcidae) and Greenidea ficicola Takahashi (Hemiptera: Aphididae). Unlike M. gladiata, the populations of these insects on shoots remained high from May onward. Among natural enemies of the invasive pest, Prionomitus mitratus (Dalman) (Hymenoptera, Encyrtidae) and Anthocoris nemoralis (Fabricius) (Hemiptera, Anthocoridae) were the most abundant. The encyrtid is here reported for the first time as a parasitoid of M. gladiata. Its presence was constant all along the study period, with a peak in May and June and an apparent preference for the older instars (third to fifth nymph stages) was recorded. In an attempt to indicate a possible remedy to the heavy infestations of M. gladiata, and considering the urban location of the sampled trees, two pesticides, a paraffin and a botanical oil, were tested. Treatments significantly reduced the population of the psyllid. The botanical oil resulted more effective than paraffin oil in reducing the number of the first two nymphal instars, regardless their innermost position on infested shoots.

Acoustics is the basics of the most important technologies for underwater telecommunication, as w... more Acoustics is the basics of the most important technologies for underwater telecommunication, as well as for target detection and identification in the aquatic media. Multiple frequency measurements are the key for species discrimination and open the door for sustainable fisheries. The development of wider broadband systems and quantitative multi-beam sonars and processing techniques constitute the present challenge for scientists and developers. In parallel, simpler and cost-efficient systems like satellite buoys can offer clue information for marine ecosystem monitoring or target species fisheries.

The study presented in this paper belongs to a more general project of research focused in the in... more The study presented in this paper belongs to a more general project of research focused in the influence of technology (Tics) in the comprehension of basic nocions in calculus. More particulary, in this paper we will show a set of activities to be developed in Matlab in the context of environmental sciences studies and in the constructivism theoretical framework of Action-Process-Object and Scheme (Apos)

En la Comunidad Valenciana se producen numerosos incendios forestales especialmente en los meses ... more En la Comunidad Valenciana se producen numerosos incendios forestales especialmente en los meses de verano, afectando principalmente a pino blanco (Pinus halepensis Mill), que es la especie más abundante en nuestros montes. Se ha realizado el seguimiento de pinos parcialmente afectados por el fuego en dos incendios que se produjeron en agosto de 2007 y julio de 2009. En estos árboles se midieron una serie de parámetros (altura del árbol, altura del fuste, diámetro normal, diámetro basal, espesor de corteza, altura del fuste y altura del árbol afectadas por el fuego, porcentaje de copa quemada y porcentaje del diámetro normal quemado) y se siguió la evolución de los mismos hasta el otoño siguiente al incendio, anotando los árboles muertos y los que sobrevivieron. Se ha realizado un análisis factorial por el método de las componentes principales para las variables analizadas. Los resultados del análisis indican que es posible predecir la mortalidad post- incendio en P. halepensis basá...

Revista Latinoamericana de Investigación en Matemática Educativa

The purpose of this research is to characterize the development of the scheme for the integral as... more The purpose of this research is to characterize the development of the scheme for the integral as defined by earth science engineering students using fuzzy metrics in order to establish the level of development on intra, inter and trans levels (Piaget & García, 1984). The results demonstrate the difficulty of students to link the succession of Riemann sums with their dependence on the n value of the partition, as a manifestation of the relationship between the succession of Riemann sums and the step to the limit which forms the meaning of the defined integral.

We give an example of the gradation of openness (a fuzzy topology in Shostak’s sense) and deduce ... more We give an example of the gradation of openness (a fuzzy topology in Shostak’s sense) and deduce from it a pseudo-measure of fuzziness.

Generalized discrete-time periodic linear systems are important and useful in system modelling. T... more Generalized discrete-time periodic linear systems are important and useful in system modelling. This kind of systems can be approached in the frecuency domain by a periodic collection of nonproper rational matrices. Periodic controllers are usually represented by transfer matrices but real-time operations require the controllers to be implemented as periodic systems [2]. The study of the model requires the implementation of the controllers as minimal dimension periodic linear systems in the sense of having the minimal number of states at each time. It is not difficult to obtain a periodic forward/backward realization of the periodic collection of nonproper rational matrices [1], but is is not clear how to remove the extra or redundant states in the realization. In [1] the realization problem is studied in the case of nonproper rational matrices and it is proved that, under certain conditions, there exists a minimal forward/backward discrete time-varying linear periodic realization o...

We prove a fixed fuzzy point theorem for fuzzy contrac-tion mappings (in the S. Heilpern's se... more We prove a fixed fuzzy point theorem for fuzzy contrac-tion mappings (in the S. Heilpern's sense) over a complete metric space, and as a consequence we obtain a fixed point theorem in the context of intuitionistic fuzzy sets.

Random two-parameter TGC growth model A mathematical model to simulate fish growth is presented, ... more Random two-parameter TGC growth model A mathematical model to simulate fish growth is presented, based on the model proposed by Cho (1992), which had only one parameter: the thermal growth coefficient (TGC). Our new model's fundamental differ- ence is the consideration of a second parameter, which makes it possible to factor out the impact of tempera- ture and other factors on fish growth. The proposed model enables us to consider temperature and starting weight as random variables, and has been implemented in a computer program using the Matlab mathemat- ical package.

Applied General Topology

We give a new concept of fuzzy topological subspace, which extends the usual one and study in it ... more We give a new concept of fuzzy topological subspace, which extends the usual one and study in it the related concepts of interior, closure and connectedness

Length-weight (L-W) relationships are important parameters in Atlantic bluefin tuna (Thunnus thyn... more Length-weight (L-W) relationships are important parameters in Atlantic bluefin tuna (Thunnus thynnus L) (ABFT) stock assessments. Some datasets used to determine L-W relationships contain outliers which may significantly affect the accuracy of these L-W relationship and other parameters utilised during stock assessments. A method is proposed to filter out these outliers and provide more meaningful L-W relationships. This method is based on the application of the Tukey’s Outlier method on the Fulton’s Condition Factor (K) data derived from available fork length (FL) and round weight (RWT) data. In this paper Tukey’s Outlier method was applied to K data derived from the FLs and RWTs of eight Atlantic bluefin tuna datasets from both wild and farmed Atlantic bluefin tuna. Lower and upper filtering limits were used to filter out outlying FL and RWT data points in the original datasets to determine new L-W relationships. It was shown that applying Tukey’s Outlier filtering procedure signi...

Reviews in Fisheries Science, 2014

ABSTRACT The growth equation currently used for Atlantic bluefin tuna, Thunnus thynnus (L.), east... more ABSTRACT The growth equation currently used for Atlantic bluefin tuna, Thunnus thynnus (L.), eastern stock (Lt = 318.85 [1-e^(-0.093*(t + 0.97)) is validated using several approaches. The first method involved a comparison of studies with von Bertalanffy parameter estimates in which, different methods for the age estimation are utilized, taking as references the maximum size of this species (Lmax = 319.93 +- 11.3 cm) and the growth equation of the western Atlantic stock (Lt = 314.90 [1-e ^(0.089* (t+1.13)). The result of this analysis showed that the growth equation used by ICCAT’s Standing Committee on Research and Statistics Atlantic bluefin tuna assessment group for the eastern stock perfectly fits Lmax. Second, an analysis was realized from first dorsal spine rings, 578 samples (age groups 0 to 3) of ABFT collected from the Bay of Biscay and the Mediterranean Sea, enabled the interpretation of the wide opaque bands (fast growth), formed during the boreal late spring and completed by autumn (June to November), and the translucent rings (hyaline rings, slow growth), formed during boreal autumn to late spring (November to May-June). In addition, first dorsal spine sections bands of two recovered fish that had carried conventional and electronic archival tags are also consistent. The chronological analysis of the opaque bands and hyaline rings of one fish tagged with an archival tag and recovered in the Bay of Biscay (the first time such a spine had been available for such analysis) revealed that transatlantic migrations may lead to double hyaline ring formation in the spine. Finally, the validation of the ABFT growth equation is made by superimposing tag-recovery data from tagging surveys in the Bay of Biscay, western Mediterranean and western Atlantic (N = 131) and spine readings (N = 299) to the eastern stock ABFT growth equation and analysing residuals. The coefficient of determination (R^2 = 97.98) and the residual’s distribution indicated good performance of the model. Although no important differences between the growth model of the eastern stock and that of the western stock are found, in all cases studied, the predictive accuracy indicators are better for the eastern model.

Multidisciplinary Journal for Education, Social and Technological Sciences, 2014

The student who access the University understands a curve as a function represented by an equalit... more The student who access the University understands a curve as a function represented by an equality involving the Cartesian variables x and y. But he does not know another great set of curves such as those described by parametric equations and polar coordinates. We show an experience developed in two consecutive courses in the first course of a bachelor's degree, which allows the students to discover and create many curves in parametric or polar representation, working in group. Also the experience facilitate the students to achieve several generic skills.

Modelling in Science Education and Learning, 2014

Urban Forestry & Urban Greening, 2015

ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homot... more ABSTRACT The phenology and natural enemies of Macrohomotoma gladiata (Kuwayama) (Hemiptera, Homotomidae) on Ficus microcarpa L. in Valencia (Spain) were studied in 2013. During the study, all immature instars of the pest were found on infested shoots indicating overlapping generations. However, two consistent increases in the proportion of the first two nymphal instars were detected in early March and June, possibly suggesting the beginning of spring and summer generations. Eggs of M. gladiata were usually found below the stipules of new healthy shoots, arranged in groups of 15-30 units. First two nymphal instars usually preferred the innermost part of the shoot, whereas the older developmental stages were localised more externally. The abundance of pest population increased in February-April and lowered from May onward. A number of other pest species were collected on the sampled trees. These included: Gynaikothrips ficorum (Marchal) (Thysanoptera, Phlaeothripidae), Pseudococcus longispinus(TargioniTozzetti) (Hemiptera, Pseudococcidae) and Greenidea ficicola Takahashi (Hemiptera: Aphididae). Unlike M. gladiata, the populations of these insects on shoots remained high from May onward. Among natural enemies of the invasive pest, Prionomitus mitratus (Dalman) (Hymenoptera, Encyrtidae) and Anthocoris nemoralis (Fabricius) (Hemiptera, Anthocoridae) were the most abundant. The encyrtid is here reported for the first time as a parasitoid of M. gladiata. Its presence was constant all along the study period, with a peak in May and June and an apparent preference for the older instars (third to fifth nymph stages) was recorded. In an attempt to indicate a possible remedy to the heavy infestations of M. gladiata, and considering the urban location of the sampled trees, two pesticides, a paraffin and a botanical oil, were tested. Treatments significantly reduced the population of the psyllid. The botanical oil resulted more effective than paraffin oil in reducing the number of the first two nymphal instars, regardless their innermost position on infested shoots.

Reviews in Fisheries Science, 2013