cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7511783
title: Burden, anxiety and depression in caregivers of Alzheimer patients in the Dominican Republic

description: Alzheimer's disease (AD) has a major impact by limiting the ability to live independently. This condition of dependency involves all members of the family, particularly those who take direct care of patients. The changes that take place in caregivers' lives may alter their health and have an effect on the care of the sick. OBJECTIVE: To determine the presence of burden, anxiety and depression in caregivers of Alzheimer's patients. METHOD: A descriptive cross-sectional study was performed in 67 family caregivers from the Alzheimer's Clinic Research Unit, Memory and Alzheimer, in the city of Santiago, Dominican Republic. Caregivers were evaluated for burden intensity with the Zarit scale and for both depression and anxiety using the respective Hamilton scales. Descriptive statistical analysis and Pearson correlation were used. RESULTS: 84% of caregivers were female, and 52% were older than 50 years. A total of 36% exhibited caregiver burden; 19% anxiety symptoms; and 43% depressive symptoms. No statistical significance was found between age, sex and number of hours of care. A significant association was found in the Pearson correlation coefficient between caregiver burden, anxiety and depression. CONCLUSION: Caregiver burden was associated with anxiety and depression. It is important for health professionals to include caregiver assessments in the treatment protocols of dementia. Policy should include support programs for carers.
DOI: 10.6084/m9.figshare.7511783.v1
title: Burden, anxiety and depression in caregivers of Alzheimer patients in the Dominican Republic

description: Alzheimer's disease (AD) has a major impact by limiting the ability to live independently. This condition of dependency involves all members of the family, particularly those who take direct care of patients. The changes that take place in caregivers' lives may alter their health and have an effect on the care of the sick. OBJECTIVE: To determine the presence of burden, anxiety and depression in caregivers of Alzheimer's patients. METHOD: A descriptive cross-sectional study was performed in 67 family caregivers from the Alzheimer's Clinic Research Unit, Memory and Alzheimer, in the city of Santiago, Dominican Republic. Caregivers were evaluated for burden intensity with the Zarit scale and for both depression and anxiety using the respective Hamilton scales. Descriptive statistical analysis and Pearson correlation were used. RESULTS: 84% of caregivers were female, and 52% were older than 50 years. A total of 36% exhibited caregiver burden; 19% anxiety symptoms; and 43% depressive symptoms. No statistical significance was found between age, sex and number of hours of care. A significant association was found in the Pearson correlation coefficient between caregiver burden, anxiety and depression. CONCLUSION: Caregiver burden was associated with anxiety and depression. It is important for health professionals to include caregiver assessments in the treatment protocols of dementia. Policy should include support programs for carers.
DOI: 10.6084/m9.figshare.7515230
title: Water quality of the São Gonçalo channel, urban and agricultural water supply in southern Brazil

description: ABSTRACT São Gonçalo channel connects Patos and Mirim lagoons, in South Brazil. This ecosystem is 70 Km long, and is a major regional source of urban and agricultural water supply, mainly for the municipality of Rio Grande, with ca. 250 thousand citizens. This study aims to diagnose their water quality by measuring benthic invertebrates (Shannon-Wiener diversity index, richness and abundance), use of a BMWP biotic index, physical and chemical evaluation, and applying a trophic state index. The BMWP index showed predominance of taxa indicating altered conditions and polluted waters (Sarcodina and Hydracarina). The abiotic variables indicated eutrophicated waters, chlorophyll values characteristic of eutrophic environments (&gt;2.9 µg. L–1), low N:P rates in sediment and water, with nitrogen limitation during most periods studied. The results of trophic state indexes indicated mesotrophic and eutrophic conditions, reaching hipereutrophic periods. The highest TSI were in Piratini river, in April 2009 and February 2011, coinciding with rice crop leaching. These results regarding nutrient concentration, nitrogen and phosphorus stoichiometry and biotic index support the need to evaluate the occupation of the surroundings of this water supply.
DOI: 10.6084/m9.figshare.7515230.v1
title: Water quality of the São Gonçalo channel, urban and agricultural water supply in southern Brazil

description: ABSTRACT São Gonçalo channel connects Patos and Mirim lagoons, in South Brazil. This ecosystem is 70 Km long, and is a major regional source of urban and agricultural water supply, mainly for the municipality of Rio Grande, with ca. 250 thousand citizens. This study aims to diagnose their water quality by measuring benthic invertebrates (Shannon-Wiener diversity index, richness and abundance), use of a BMWP biotic index, physical and chemical evaluation, and applying a trophic state index. The BMWP index showed predominance of taxa indicating altered conditions and polluted waters (Sarcodina and Hydracarina). The abiotic variables indicated eutrophicated waters, chlorophyll values characteristic of eutrophic environments (&gt;2.9 µg. L–1), low N:P rates in sediment and water, with nitrogen limitation during most periods studied. The results of trophic state indexes indicated mesotrophic and eutrophic conditions, reaching hipereutrophic periods. The highest TSI were in Piratini river, in April 2009 and February 2011, coinciding with rice crop leaching. These results regarding nutrient concentration, nitrogen and phosphorus stoichiometry and biotic index support the need to evaluate the occupation of the surroundings of this water supply.
DOI: 10.6084/m9.figshare.7515218
title: Compensatory alternatives for flooding control in urban areas with tidal influence in Recife - PE

description: ABSTRACT This paper presents a study of compensatory alternatives in urban drainage, using SWMM model (Storm Water Management Model), for the critical point of flooding in an urban area and vulnerable to tide fluctuations, located in Recife. For this, we used the registered information of the micro-drainage network and defined the parameters and variables required for modeling, such as: the subareas of contribution to the drainage system, indicating the percentage of soil waterproofing, equivalent width, slope, and infiltration rate; project rain; and tide curve. Two alternatives were simulated after the model has been calibrated. The first, which is an adaptation of the drainage network, presented maximum reductions in the volume of flooding of 37% for the events with recurrence period of two years and of 58% for five years of recurrence. The second, based on the deployment of a detention tank in the existing network, presented satisfactory results for the event of two years and reduced approximately 38% for events of five years. The results showed that there was a reduction in the area of flooding for the conditions simulated. However, the first alternative would not solve the local flooding problems, it would only attenuate and would increase the overload of the drainage pipes downstream of the modified system, while the second alternative could solve the problem of flooding, with the occurrence of an event of two years.
DOI: 10.6084/m9.figshare.7515218.v1
title: Compensatory alternatives for flooding control in urban areas with tidal influence in Recife - PE

description: ABSTRACT This paper presents a study of compensatory alternatives in urban drainage, using SWMM model (Storm Water Management Model), for the critical point of flooding in an urban area and vulnerable to tide fluctuations, located in Recife. For this, we used the registered information of the micro-drainage network and defined the parameters and variables required for modeling, such as: the subareas of contribution to the drainage system, indicating the percentage of soil waterproofing, equivalent width, slope, and infiltration rate; project rain; and tide curve. Two alternatives were simulated after the model has been calibrated. The first, which is an adaptation of the drainage network, presented maximum reductions in the volume of flooding of 37% for the events with recurrence period of two years and of 58% for five years of recurrence. The second, based on the deployment of a detention tank in the existing network, presented satisfactory results for the event of two years and reduced approximately 38% for events of five years. The results showed that there was a reduction in the area of flooding for the conditions simulated. However, the first alternative would not solve the local flooding problems, it would only attenuate and would increase the overload of the drainage pipes downstream of the modified system, while the second alternative could solve the problem of flooding, with the occurrence of an event of two years.
DOI: 10.6084/m9.figshare.7515224
title: Modeling metabolism in an integrated subtropical watershed-reservoir system

description: ABSTRACT Reservoirs are considered transition systems between rivers and lakes with particular features due to its morphology and watershed inflows. Studies about aquatic metabolism in subtropical aquatic ecosystems, particularly in reservoirs, have been based on direct measurements and statistical relationships in specific gauge stations of the system rather than on analytical models, which are capable of representing the metabolic processes at different temporal and spatial scales. This paper aimed to evaluate the temporal variability of metabolism in a subtropical reservoir, named Faxinal reservoir, located in Caxias do Sul, Rio Grande do Sul state, Brazil, by using an ecological model (IPH-ECO) which was coupled with a hydrological model (IPH-II) to estimate inflows and nutrient loadings from the watershed. After model calibration, metabolic daily rates of gross primary production (GPP) and respiration (R) were estimated over a 1-year period (from November 2011 to December 2012), considering a process-based algorithm based on dissolved-oxygen budget implemented in the IPH-ECO model. Faxinal reservoir were net heterotrophic 97% of the simulation period. The temporal variability of GPP and R followed the general pattern of phytoplankton biomass in reservoir, which was more related to autochthonous factors such as water residence time, light availability, nutrient concentration and zooplankton grazing. Only during heavy rainfall period, increasing the terrestrial exports, the concentration of phosphorus was higher leading to an increase of chlorophyll-a concentration and hence metabolic rates of GPP and R. Therefore, considering the long dry period during the simulation, the aquatic metabolism of Faxinal reservoir is more influenced by the internal dynamic of the aquatic ecosystem than the watershed inputs.
DOI: 10.6084/m9.figshare.6125282.v1
title: Processing of large offset data: experimental seismic line from Tenerife Field, Colombia

description: ABSTRACT: Exploration seismology provides the main source of information about the Earth’s subsurface, which in many cases can be presented as a simple model of horizontal or near-horizontal layers. After the seismic acquisition step, conventional seismic processing of reflection data provides an image of the subsurface by using information about the reflections of these layers. The traveltime from a source to different receivers is adjusted using a hyperbolic function. This expression is used in the case involving an isotropic medium, which is a simplification of nature, whereas geologically complex media are generally anisotropic. A subsurface model that more closely resembles reality is the vertical transverse isotropy, which defines two parameters that are required to correct the traveltimes: the NMO velocity and the anellipticity parameter. In this paper, we reviewed the literature and methodology for velocity analysis of seismic data acquired from anisotropic media. A model with horizontal layers and anisotropic behavior was developed and evaluated. The anisotropic velocity was compared to the isotropic velocity, and the results were analyzed. Finally, the methodology was applied to real seismic data, i.e. an experimental landline from Tenerife Field, Colombia. The results show the importance of the anellipticity parameter in models with anisotropic layers.
DOI: 10.6084/m9.figshare.7515224.v1
title: Modeling metabolism in an integrated subtropical watershed-reservoir system

description: ABSTRACT Reservoirs are considered transition systems between rivers and lakes with particular features due to its morphology and watershed inflows. Studies about aquatic metabolism in subtropical aquatic ecosystems, particularly in reservoirs, have been based on direct measurements and statistical relationships in specific gauge stations of the system rather than on analytical models, which are capable of representing the metabolic processes at different temporal and spatial scales. This paper aimed to evaluate the temporal variability of metabolism in a subtropical reservoir, named Faxinal reservoir, located in Caxias do Sul, Rio Grande do Sul state, Brazil, by using an ecological model (IPH-ECO) which was coupled with a hydrological model (IPH-II) to estimate inflows and nutrient loadings from the watershed. After model calibration, metabolic daily rates of gross primary production (GPP) and respiration (R) were estimated over a 1-year period (from November 2011 to December 2012), considering a process-based algorithm based on dissolved-oxygen budget implemented in the IPH-ECO model. Faxinal reservoir were net heterotrophic 97% of the simulation period. The temporal variability of GPP and R followed the general pattern of phytoplankton biomass in reservoir, which was more related to autochthonous factors such as water residence time, light availability, nutrient concentration and zooplankton grazing. Only during heavy rainfall period, increasing the terrestrial exports, the concentration of phosphorus was higher leading to an increase of chlorophyll-a concentration and hence metabolic rates of GPP and R. Therefore, considering the long dry period during the simulation, the aquatic metabolism of Faxinal reservoir is more influenced by the internal dynamic of the aquatic ecosystem than the watershed inputs.
DOI: 10.6084/m9.figshare.6125282
title: Processing of large offset data: experimental seismic line from Tenerife Field, Colombia

description: ABSTRACT: Exploration seismology provides the main source of information about the Earth’s subsurface, which in many cases can be presented as a simple model of horizontal or near-horizontal layers. After the seismic acquisition step, conventional seismic processing of reflection data provides an image of the subsurface by using information about the reflections of these layers. The traveltime from a source to different receivers is adjusted using a hyperbolic function. This expression is used in the case involving an isotropic medium, which is a simplification of nature, whereas geologically complex media are generally anisotropic. A subsurface model that more closely resembles reality is the vertical transverse isotropy, which defines two parameters that are required to correct the traveltimes: the NMO velocity and the anellipticity parameter. In this paper, we reviewed the literature and methodology for velocity analysis of seismic data acquired from anisotropic media. A model with horizontal layers and anisotropic behavior was developed and evaluated. The anisotropic velocity was compared to the isotropic velocity, and the results were analyzed. Finally, the methodology was applied to real seismic data, i.e. an experimental landline from Tenerife Field, Colombia. The results show the importance of the anellipticity parameter in models with anisotropic layers.
DOI: 10.6084/m9.figshare.7515215
title: Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method

description: ABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount of these hydraulic structures and lack of such analyzes. Considering the above, this paper aims to evaluate the Dundee Hydrological Regime Alteration Method (DHRAM) through the classification of the degree of impact of dams located on rivers Itapicuru, Paraguaçu and their tributaries, verifying the adequacy of its use to represent the semi-arid hydrologic regime. Thereby, the DHRAM was applied in three versions: considering the thresholds that define the scores to classify the degree of impact in its original set (accordingly to Black et al. (2005)); with the adjustment of those thresholds to local conditions; and, with the regrouping of variables and adjustment of thresholds. The results showed that the method in its original set is applicable to semi-arid rivers, however it tends to be very restrictive against the high natural hydrologic variability characteristic of these rivers, and it ends up pointing to a high degree of alteration for dams that are known for not causing a very siginifcant flow regulation. The DHRAM with the regrouping of variables and the adjustment of thresholds presented the classification that approached the most to the known characteristics of the studied dams, being useful for the evaluation of the impact of dams still in project, and also to guide the adoption of operating rules that minimize the most significant hydrologic alterations that are identified.
DOI: 10.6084/m9.figshare.7515215.v1
title: Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method

description: ABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount of these hydraulic structures and lack of such analyzes. Considering the above, this paper aims to evaluate the Dundee Hydrological Regime Alteration Method (DHRAM) through the classification of the degree of impact of dams located on rivers Itapicuru, Paraguaçu and their tributaries, verifying the adequacy of its use to represent the semi-arid hydrologic regime. Thereby, the DHRAM was applied in three versions: considering the thresholds that define the scores to classify the degree of impact in its original set (accordingly to Black et al. (2005)); with the adjustment of those thresholds to local conditions; and, with the regrouping of variables and adjustment of thresholds. The results showed that the method in its original set is applicable to semi-arid rivers, however it tends to be very restrictive against the high natural hydrologic variability characteristic of these rivers, and it ends up pointing to a high degree of alteration for dams that are known for not causing a very siginifcant flow regulation. The DHRAM with the regrouping of variables and the adjustment of thresholds presented the classification that approached the most to the known characteristics of the studied dams, being useful for the evaluation of the impact of dams still in project, and also to guide the adoption of operating rules that minimize the most significant hydrologic alterations that are identified.
DOI: 10.6084/m9.figshare.7518740.v1
title: The efficiency of curved jetties in Bay of Santos – SP: numerical modeling

description: ABSTRACT Nowadays, Port of Santos is the largest in Latin America, and it is undergoing a process of deepening of its access channel and, as its final target, is expected to attain 17 m. A considerable increase in the maintenance dredging volume is expected, particularly for the section of the maritime sandbar that is, currently, only maintained by dredging. Consequently, this study employed numerical modeling to propose an efficient layout for two curved, current-guiding jetties for the transposition of the maritime sandbar of Port of Santos navigation channel, and it’s evaluated their efficiency in maintaining depths throughout the channel. Therefore, it was used only the hydrodynamic model of Mike 21 to compare the results with the physical modeling realized in the same simulation conditionals. The results indicate, in both approaches, the current velocities increased with the proposal jetties. Thus, the accomplished study indicates that the adoption of permanent constructions for transposition of the maritime sandbar of the Port of Santos is clearly feasible and it could constitute a more economically attractive option for maintaining depths of 17 m than the current one.
DOI: 10.6084/m9.figshare.7518740
title: The efficiency of curved jetties in Bay of Santos – SP: numerical modeling

description: ABSTRACT Nowadays, Port of Santos is the largest in Latin America, and it is undergoing a process of deepening of its access channel and, as its final target, is expected to attain 17 m. A considerable increase in the maintenance dredging volume is expected, particularly for the section of the maritime sandbar that is, currently, only maintained by dredging. Consequently, this study employed numerical modeling to propose an efficient layout for two curved, current-guiding jetties for the transposition of the maritime sandbar of Port of Santos navigation channel, and it’s evaluated their efficiency in maintaining depths throughout the channel. Therefore, it was used only the hydrodynamic model of Mike 21 to compare the results with the physical modeling realized in the same simulation conditionals. The results indicate, in both approaches, the current velocities increased with the proposal jetties. Thus, the accomplished study indicates that the adoption of permanent constructions for transposition of the maritime sandbar of the Port of Santos is clearly feasible and it could constitute a more economically attractive option for maintaining depths of 17 m than the current one.
DOI: 10.6084/m9.figshare.7515221
title: Wave directional measurement in Patos Lagoon, RS, Brazil

description: ABSTRACT The wave climate characterization in coastal environments is essentially important to oceanography and coastal engineering professionals regarding coastal protection works. Thus, this study aims to determine the most frequent wave parameters (significant wave height, peak period and peak direction) in Patos Lagoon during the period of operation of a directional waverider buoy (from 01/27/2015 to 06/30/2015). The equipment was moored at approximately 14 km from the São Lourenço do Sul coast at the geographic coordinates of 31º29’06” S and 51º55’07” W, with local depth of six meters, registering significant wave height, peak period and peak direction time series. During the analyzed period, the greatest wave frequencies corresponded to short periods (between 2 and 3.5 seconds) and small values of significant wave heights (up to 0.6 meters), with east peak wave directions. The largest wave occurrences corresponded to east peak wave directions (33.3%); peak wave periods between 2.5 and 3 seconds (25.6%) and between 3 and 3.5 seconds (22.1%); and to significant wave heights of up to 0.3 meters (41.2%) and from 0.3 to 0.6 meters (38%). This research yielded unprecedented findings to Patos Lagoon by describing in detail the most occurring wave parameters during the analyzed period, establishing a consistent basis for several other studies that might still be conducted by the scientific community.