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Journal of Geoscience and Environment Protection 2024年第1期12卷 64-79页

作者： Ramón Delanoy Carime Matos-Espinosa Yamilesa Herrera de los santos Institute of Physics Autonomous University of Santo Domingo Santo Domingo Dominican Republic Ministry of Higher Education Science and Technology Santo Domingo Dominican Republic

The objective of this study was to establish a baseline for future studies that aim to determine possible contamination from human, agricultural and industrial activities. As well as the determination of the indices of environmental or geological contamination and enrichment factors of heavy metals Cr, Ni, Cu, Zn, As, Cd, Hg and Pb in agricultural soils of Constanza, Jarabacoa, Rancho Arriba and San José de Ocoa (SJO), municipalities located in the valleys of the Central mountain range of the Dominican Republic. The determination of the concentrations of heavy metals was carried out using the X-ray Fluorescence technique. Just like in Azua, San Juan de la Maguana (SJM) y Barahona in the southwest. Producer municipalities of vegetables, rice, beans, corn, melon, watermelon, tomato, banana, avocado, sugar cane and fodder for cattle. The concentration of 160 mg·kg-1 Probable Effect Level (PEL) of Cr according to the SQuiRTs table (USEPA-NOAA) for agricultural soils, were exceeded in 50% of the samples in SJM, SJO, Jarabacoa and Constanza;in Barahona and Azua by 20%. The PEL of 42.8 mg·kg-1 of the Ni was higher in more than 50% of the samples from SJM, Azua, Barahona and Jarabacoa;in SJO and Constanza at 35%. In the case of Cu with a PEL of 108 mg·kg-1 in SJO and Constanza, 5% of the samples exceeded its, in the other areas the concentrations were lower. Zn, As and Pb did not manage to exceed their respective PEL.

关键词： Soil Heavy Metals Constanza Azua X-Ray Fluorescence

Efficiency and effectiveness of systems for the treatment of domestic wastewater based on subsurface flow constructed wetlands in Jarabacoa, Dominican Republic

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Water Science and Engineering 2024年第2期17卷 118-128页

作者： Yvelisse Pérez Enmanuel Vargas Daniel Garcia-Cortes William Hernandez Humberto Checo Ulises Jauregui-Haza Area de Ciencias Basicas y Ambientales Instituto Tecnologico de Santo Domingo(INTEC)Avenida de Los Proceres 49Los Jardines del NorteSanto Domingo 10602Dominican Republic Ministry of Environment and Natural Resources Calle Cayetano Germosen esq.Ave.LuperonEl PedregalSanto Domingo 11107Dominican Republic Plan Yaque Calle Estela Geraldino 14 AltosJarabacoa 41000Dominican Republic Institute of Technologies and Applied Sciences University of HavanaHavana 10400Cuba

Constructed wetlands(CwW)are well known nature-based systems for water *** study evaluated the efficiency and effectiveness of seven domestic wastewater treatment systems based on horizontal flow CWs in Jarabacoa,the Dominican *** results showed that the CWs were efficient in reducing the degree of contamination of wastewater to levels below the Dominican wastewater discharge standards for parameters such as the 5-day biochemical oxygen demand(BOD5)and chemical oxygen demand,but not for the removal of phosphorus and fecal *** addition,a horizontal flow subsurface wetland in the peri-urban area El Dorado was evaluated in terms of the performance of wastewater treatment in tropical climatic *** concentrations of heavy metals,such as zinc,copper,chromium,and iron,were found to decrease in the effluent of the wetland,and the concentrations for nickel and manganese tended to *** levels of heavy metals in the effluent were lower than the limit values of the Dominican wastewater discharge *** construction cost of these facilities was around 200 USD per population equivalent,similar to the cost in other countries in the same *** study suggested some solutions to the improved performance of CWs:selection of a microbial flora that guarantees the reduction of nitrates and nitrites to molecular nitrogen,use of endemic plants that bioaccumulate heavy metals,combination of constructed wetlands with filtration on activated carbon,and inclusion of water purification processes that allow to evaluate the reuse of treated water.

关键词： Domestic wastewater Constructed wetland BOD COD Pathogens Heavy metals

Heavy Metals in Agricultural Soils of San Francisco de Macorís and La Vega, Dominican Republic

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Journal of Geoscience and Environment Protection 2022年第10期10卷 54-65页

作者： Ramón Delanoy Carime Matos Espinosa Yamilesa Herrera autonomous university of santo domingo Ministry of Higher Education Science and Technology Santo Domingo Dominican Republic

In Dominican Republic exists cultive larges fields of various agricultural rubles. The largest extensions are rice, banana and cocoa;these are located in the Cibao Valley. In the eastern, southwestern, and a small area in the north of the country, sugar cane is cultivated. Heavy metals are found in many of these soils that could be affecting the quality of agricultural products or production. The levels of Cr, Ni, Zn, Cu, Cd, As, Hg and Pb, determined by X-ray fluorescence spectroscopy, in soils collected in two cultivation areas of Rice de La Vega and San Francisco de Macoris (SFM) have been compared with the NOAA-USEPA Canadian Agricultural Soil and Sediment Guide (CEQGs) (SQuiRTs Table). The levels of Cr and Ni in La Vega exceeded the threshold effects levels (TEL), and the probable effects levels (PEL). Pb levels in the La Vega area were higher than in SFM. In general, these metals are found in the La Vega area in higher concentrations than in SFM, exceeding PEL and TEL.

关键词： Soil Heavy Metals Fluorescence X-Ray Toxicity

Geochemistry and Heavy Metal Levels in the Sediments of the Port of Santa Bárbara de Samana, Dominican Republic

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Journal of Geoscience and Environment Protection 2021年第4期9卷 195-205页

作者： Ramón Delanoy Misael Díaz Asencio Darlin Rodriguez Ministry of Higher Education Science and Technology Institute of Physics Autonomous University of Santo Domingo Santo Domingo Dominican Republic Division of Oceanology Ensenada Center for Scientific Research and Higher Education Ensenada México Department of Physics Autonomous University of Santo Domingo Santo Domingo Dominican Republic

In the Port of Santa Bárbara de Samana, chemical residues, organic matter and heavy metals from domestic activities are deposited together in the waters and sediments. The analysis of the sediments by X-ray fluorescence of four extracted and sectioned cores showed that concentrations of trace metals such as Nickel, Chromium, Lead and Mercury were present at various depths, exceeding Limits of Toxicity (PEL) for marine sediments according to National Oceanic and Atmospheric Administration (NOAA) and Canadian Council of Ministers of the Environment (CCME). Cadmium presented values above the toxicity threshold (TEL) in its minimum values and in its maximum values they exceeded the PEL value. While the Zinc and Copper values were low in all sections and lower than TEL. The analysis of the loss by ignition and the dating with lead 210 due to excess of the C4 core, showed a sudden change in the organic matter content and sedimentation rate. The superficial sediments show that unlike the deeper ones, the heavy metal content is lower, as well as that they do not represent a risk to the ecosystem by not exceeding toxicity levels.

关键词： Sediment Heavy Metal Port of Samana X-Ray Fluorescence Mercury

Heavy Metals in the Northwest Agricultural Region Dominican Republic

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Journal of Geoscience and Environment Protection 2022年第5期10卷 16-24页

作者： Ramón Delanoy Carime Matos Espinosa Yamilesa Herrera Institute of Physics Faculty of Sciences Autonomous University of Santo Domingo Ministry of Higher Education Science and Technology Santo Domingo Dominican Republic

Heavy metals currently represent a very important source of contamination, since their intake by humans and animals in many cases is the cause of serious damage to health. Soil, air, water and food are the most common pathways for heavy metals to reach organisms. Since soil is their origin, in this study we focus on soil analysis to determine the concentration of Cr, Ni, Cu, Zn, As, Hg, Cd and Pb, which are the most toxic metals. The study site is the agricultural soils of the northwestern region of the Dominican Republic where bananas and rice are the main crops grown. Chromium levels in most samples exceeded the NOAA-USEPA Probable Effects Level (PEL). Other heavy metals were within the acceptable ranges for healthy soil, according to the Food and Agriculture Organization (FAO).

关键词： Heavy Metals Soil Contamination Agricultural Soils

ProTSA: A Testing Process for Automotive Software Domain

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Journal of Software Engineering and Applications 2024年第7期17卷 571-615页

作者： Renato Rafael Arcanjo Luiz Eduardo Galvão Martins Dirceu Lavoiser Fernandes Graci Department of Inovation and Science Federal University of Sao Paulo (UNIFESP) Sao Jose dos Campos Brazil Department of Automotive Electronics Faculty of Technology of Sao Paulo (Fatec) Santo Andre Brazil

This study evaluates the development of a testing process for the automotive software domain, highlighting challenges stemming from the absence of adequate processes. The research demonstrates the application of Design Science Research methodology in developing, an automotive software testing process—ProTSA, using six functional testing modules. Additionally, the study evaluates the benefits of implementing ProTSA in a specific Original Equipment Manufacturer (OEM) using an experimental single-case approach with industry professionals’ participation through a survey. The study concludes that combining testing techniques with effective communication and alignment is crucial for enhancing software quality. Furthermore, survey data indicates that implementing ProTSA leads to productivity gains by initiating tests early, resulting in time savings in the testing program and increased productivity for the testing team. Future work will explore implementing ProTSA in cybersecurity, over-the-air software updates, and autonomous vehicle testing processes. .

关键词： Verification and Validation Automotive Software Automotive Systems

Discovery of unique African Helicobacter pylori CagAmultimerization motif in the Dominican Republic

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World Journal of Gastroenterology 2020年第45期26卷 7118-7130页

作者： Takaaki Ono Modesto Cruz Hiroyuki Nagashima Phawinee Subsomwong Junko Akada Takashi Matsumoto Tomohisa Uchida Rumiko Suzuki Celso Hosking Jose A Jimenez Abreu Yoshio Yamaoka Department of Environmental and Preventive Medicine Oita University Faculty of MedicineYufu 879-5593Japan Criminal Investigation Laboratory Oita Prefectural Police HeadquartersOita 870-1117Japan Institute of Microbiology and Parasitology IMPAFaculty of ScienceAutonomous University of Santo DomingoSanto Domingo 10103Dominican Republic Department of Biomedical Research National Institute of Medicine and Diagnostic ImagingSanto Domingo 10107Dominican Republic Department of Gastroenterology Hokkaido Cancer CenterSapporo 003-0804Japan Department of Molecular Pathology Oita University Faculty of MedicineYufu 879-5593Japan Dominican-Japanese Digestive Disease Center Dr Luis E.Aybar Health and Hygiene CitySanto Domingo 10302Dominican Republic Department of Medicine Gastroenterology and Hepatology SectionBaylor College of MedicineHoustonTX 77030United States

BACKGROUND Helicobacter pylori(***)colonizes the human stomach and is a major cause of peptic ulcer disease and gastric ***,although the prevalence of *** is high in Africa,the incidence of gastric cancer is low,and this phenomenon is called to be African *** CagA protein produced by *** is the most studied virulence *** carcinogenic potential of CagA is associated with the Glu-Pro-Ile-Tyr-Ala(EPIYA)patterns and CagAmultimerization(CM)*** To better understand the EPIYA patterns and CM motifs of the cagA *** Gastric mucosal biopsy specimens were obtained from 258 patients with dyspepsia living in the Dominican Republic,from which 120 *** strains were *** the bacterial DNA extraction,the EPIYA pattern and CM motif genotypes were determined using a polymerase chain reaction-based *** population structure of the Dominican Republic strains was analyzed using multilocus sequence typing(MLST).Peptic ulcer disease and gastric cancer were identified via endoscopy,and gastric cancer was confirmed by *** scores of the gastric mucosa were evaluated using the updated Sydney *** All CagA-positive strains carried the Western-type CagA according to the identified EPIYA ***-seven kinds of CM motifs were *** the typical Western CM motif(FPLKRHDKVDDLSKVG)was observed most frequently,the typical East Asian CM motif(FPLRRSAAVNDLSKVG)was not ***,“FPLRRSAKVEDLSKVG”,similar to the typical East Asian CM motif,was found in 21 *** this type was significantly more frequent in strains classified as hpAfrica1 using MLST analysis(P=0.034),we termed it Africa1-CM(Af1-CM).A few hpEurope strains carried the Af1-CM motif,but they had a significantly higher ancestral Africa1 component than that of those without the Af1-CM motif(P=0.030).In 30 cagA-positive strains,the"GKDKGPE"motif was observed immediately upstream of the EPIYA motif in

关键词： Helicobacter pylori CagA CagA 3'region CagA-multimerization motif Glu-Pro-Ile-Tyr-Ala motif Dominican Republic

Study of the structural,ferroelectric,dielectric,and pyroelectric properties of the K0.5Na0.5NbO3 system doped with Li+,La3+,and Ti4+

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Journal of Advanced Ceramics 2020年第3期9卷 329-338页

作者： C.MONTERO-TAVERA M.D.DURRUTHY-RODRiGUEZ F.D.CORTES-VEGA J.M.YANEZ-LIMON Center for Research and Advanced Studies of IPN Campus QueretaroMexico National Evangelical university Paseo de los Periodistas#54Ensanche MirafloresSanto DomingoDistrito NacionalRepiblica Dominicana

Pure *** sNbO3(KNN)and KNN doped with Lit(6%mole),Lat(1.66%,5%,6%mole),and Ti+t(10%mole)were prepared by mixture of oxides using high-energy milling and conventional solid-state *** effects of the dopant on the physical properties of pure KNN have been evaluated based on the structural,ferroelectric,pyroelectric,and dielectric *** XRD measurements show that KNN pure sample contains a mixture of monoclinic and orthorhombic crystalline phases,with a slightly higher concentration of monoclinic *** contrast,all doped samples show a higher concentration of the orthorhombic phase,as well as the presence of a secondary phase(K6Nb10.8O3o),also detected by Raman *** samples with a higher concentration of this secondary phase,also present greater dielectric losses and lower values of remnant *** dielectric measurements allowed us to detect temperatures of structural transitions(orthorhombic-tetragonal,O-T)previous to the ferroelectric paraelectric transition(tetragonal-cubic,T-C),and also in this set of samples,a direct correlation was found between the values of remnant polarization and the corresponding pyroelectric signal response.

关键词： K0.5Na0.5NbO3(KNN) lead-free solid-state reaction structural properties pyroelectric properties dielectric properties Li,La,Ti doping elements

Application of a new reagent for analysis of oxygen presence in a lowcarbon steel wire rod

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Journal of Iron and Steel Research International 2021年第6期28卷 729-738页

作者： M.I.Dávila-Pérez H.J.Vergara-Hernández O.Vázquez-Gómez F.Reyes-Calderón E.López-Martínez J.M.Salgado-López National Technology of Mexico/T.I.of Morelia Morelia 58120MichoacanMexico National Council for Science and Technology CONACYT Mexico City 03940Mexico Isthmus university Santo Domingo TehuantepecOaxaca 70760Mexico Engineering and Industrial Development Center CIDESI Santiago de Queretaro 76125QueretaroMexico

A microstructural analysis was performed to determine the presence of oxygen in a wire rod section of AISI 1008 steel with a surface mechanical failure produced during wire *** failure zone was analyzed by comparison using three different attack reagents:alkaline sodium chromate(ASC),ASC with hydrogen peroxide and amyl alcohol,and a solution of nitric acid in ethyl *** reagents were applied in samples in the failure zone,showing different types of zones in regions with internal and superficial defects such as carbides,pores,cracks,deformation,and detachment zones,indicating the possible presence of *** areas identified were observed by means of an optical microscope and were correlated with the content of elements that were present in the region using a scanning electron microscope and a scattered X-ray energy spectrometer,which determined that the areas identified by chromate sodium correspond to regions with a high concentration of oxygen and slag-forming elements such as silicon,aluminum,and iron;this is associated with the presence of oxygen in the oxide *** was also observed that the ASC and the modified ASC solution with hydrogen peroxide and amyl alcohol could identify areas with a high presence of oxides,while the nitric acid solution only identified the steel *** modified ASC solution is an alternative to identify the presence of chemical variants of oxygen because the conventional formulation is unstable and has a too short shelf life,and therefore,its application must be carried out at the time of preparation.

关键词： Etching Alkaline sodium chromate Oxide presence Internal defect

Analysis of Solar Distillers for Obtaining Bio-fuel

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Journal of Environmental Science and Engineering(B) 2013年第12期2卷 702-708页

作者： Rocio Solar-Gonzalez Alejandra Velasco-Perez Institute for Energy Studies University of lstmo Santo Domingo Tehuantepec Oaxaca 70760 Mdxico Department of Chemical Engineering University Eeracruzana Orizaba Veracruz 94340 Mexico

In this paper, a theoretical-economic study was carried out based on the operation and construction of different types of equipments that use solar energy to carry out the distillation process. The conclusions drawn from the analysis aimed to determine what is necessary for the optimal design of an experimental distillation module that allows bioethanol with specific features to be obtained, for the area of Tehuantepec in Mexico. This study took the experiments carried out by various authors and extracted information relevant to the selection of the parameters and variables of the proposed distiller according to their efficiency and construction costs.

关键词： Distiller energy solar bio-fuel.