252 research outputs found
Regionalizing the sea-level budget with machine learning techniques
No full textAttribution of sea-level change to its different drivers is typically done using a sea-level budget approach. While the global mean sea-level budget is considered closed, closing the budget on a finer spatial scale is more complicated due to, for instance, limitations in our observational system and the spatial processes contributing to regional sea-level change. Consequently, the regional budget has been mainly analysed on a basin-wide scale. Here we investigate the sea-level budget at sub-basin scales, using two machine learning techniques to extract domains of coherent sea-level variability: a neural network approach (self-organizing map, SOM) and a network detection approach (δ-MAPS). The extracted domains provide more spatial detail within the ocean basins and indicate how sea-level variability is connected among different regions. Using these domains we can close, within 1σ uncertainty, the sub-basin regional sea-level budget from 1993–2016 in 100 % and 76 % of the SOM and δ-MAPS regions, respectively. Steric variations dominate the temporal sea-level variability and determine a significant part of the total regional change. Sea-level change due to mass exchange between ocean and land has a relatively homogeneous contribution to all regions. In highly dynamic regions (e.g. the Gulf Stream region) the dynamic mass redistribution is significant. Regions where the budget cannot be closed highlight processes that are affecting sea level but are not well captured by the observations, such as the influence of western boundary currents. The use of the budget approach in combination with machine learning techniques leads to new insights into regional sea-level variability and its drivers
Impact of feeding on contaminated prey on the life parameters of Nesidiocoris tenuis (Hemiptera Miridae) adults
No full textInsecticide selectivity to natural enemies is an important concern in integrated pest management programs. Although there is a wide range of information concerning pesticide lethal and sublethal effects on contaminated surfaces, little is known when the route of exposure occurs at a trophic level. This study evaluates this route of pesticide intake on the omnivorous predator Nesidiocoris tenuis (Reuter) (Hemiptera Miridae) for the first time. Under laboratory conditions, prey treated with six insecticides (flubendiamide, spirotetramat, deltamethrin, flonicamid, metaflumizone, and sulfoxaflor) were offered to N. tenuis adults for 3 days. Mortality (24, 48, and 72 h after treatment), offspring production (third until eighth day) and longevity were documented. Metaflumizone and sulfoxaflor were classified as moderately harmful products because although the percentage of mortality was only 28 and 36%, respectively, both products caused a severe decrease in offspring production and longevity. Flonicamid and flubendiamide were classified as slightly harmful products; although they did not have a lethal effect, sublethal impact was important on the parameters studied. Spirotetramat and deltamethrin were insecticides categorized as harmless. This information could be useful for selecting the most appropriate insecticides to control pests in tomato crops in which N. tenuis is a relevant biological control agent. © The Author 2016.Peer reviewe
Regional Sea-level Budget from 1993-2016
No full textThis repository contains supporting data for Camargo et al.: 'Regionalizing Sea-level Budget with Machine Learning Techniques', Ocean Sciences (2022, submited).
Note: The manuscript (and dataset) has not been peer reviewed yet!!! Use this data with caution!
PLEASE CITE THE APPROPRIATE PAPERS WHEN USING THIS DATA
Please cite 'Regionalizing Sea-level Budget with Machine Learning Techniques' when using this data set. However, most of the data heavily relies on previous work and data sets by many authors, so please acknowledge that work by citing the original sources of the data (which can be found in the main text of 'Regionalizing Sea-level Budget with Machine Learning Techniques').
PLEASE CHECK THIS CAREFULLY!
This repository contains the following files:
budget_components_ENS.nc
Regional (1x1 degree) trend, uncertainty and time series of the ensemble mean of each of the budget components: total sea-level change (from altimetry) and the drivers (steric, GRD and dynamic). If required the individual data sets used for the ensemble, please contact the author.
masks.nc
netcdf containing land-ocean mask, as well as the domains maps (SOM and delta-MAPS). We refer to the manuscript for more information of how the regional domains were acquired.
dmaps_trend.pkl (and .xlsx)
Trend and uncertainties of each of the budget components for each delta-MAPS domains. Available as an excel table (.xlsx) and as pickle file (.pkl)
som_trend.pkl (and .xlsx)
Trend and uncertainties of each of the budget components for each SOM domains. Available as an excel table (.xlsx) and as pickle file (.pkl)
The code to generate this data and the manuscript figures can be found at https://github.com/carocamargo/SLB
Corresponding author: [email protected]
NUMERICAL AND EXPERIMENTAL INVESTIGATION ON THE EFFECT OF RESTRICTION SHAPE ON CHARACTERISTICS OF AIRFLOW IN A SQUARE DUCT
No full text Experimental and numerical investigation has been under taken to study turbulent flow of air through duct using restriction in different shapes and positions for Reynolds numbers ranges of (8.2x104 → 5.6x104).The numerical approach used in this work is the finite volume method for solution of elliptic partial differential equation for the modeling of turbulent (k-) model as well as wall function concept near the wall which was used to take the turbulent effects into consideration have been employed.The experimental test rigs were constructed from Perspex, and a fivehole pressure probe was used to measure the three component of air flow velocity vector in space.The results show that the total pressure drop depends on the shape and position of the restriction, and the pressure drop coefficient due to the restriction shape and position (kR) depends on two parameters; blockage area ratio (Ab) and the ratio between wetted perimeter to the free remainder perimeter (pe/Pe) and dose not depend on the Reynolds number ( for the same blockage area ratio Ab if the pe/Pe increases 40%, the coefficient kR increases 7% , and for the same pe/Pe, if the blockage area ratio increases 50% ,the coefficient kR increases 10%). But the pressure drop coefficient due to the friction (Cf) is a function of Reynolds.
Genetically modified food and international trade: The case of India, Bangladesh, Indonesia, and the Philippines
No full text"Genetically modified (GM) food crops have the potential to raise agricultural productivity in Asian countries, but they are also associated with the risk of market access losses in sensitive importing countries. We study the potential effects of introducing GM food crops in Bangladesh, India, Indonesia, and the Philippines in the presence of trade-related regulations of GM food in major importers. We focus on GM field crops (rice, wheat, maize, soybeans, and cotton) resistant to biotic and abiotic stresses, such as drought-resistant rice, and use a multi-country, multi-sector computable general equilibrium model. We build on previous international simulation models by improving the representation of the productivity shocks associated with GM crops, and by using an improved representation of the world market, accounting for the effects of GM food labeling policies in major importers and the possibility of segregation for non-GM products going toward sensitive importing countries. The results of our simulations first show that the gains associated with the adoption of GM food crops largely exceed any type of potential trade losses these countries may incur. Adopting GM crops also allows net importing countries to greatly reduce their imports. Overall, we find that GM rice is bound to be the most advantageous crop for the four countries. Second, we find that segregation of non-GM crops can help reduce any potential trade loss for GM adopters, such as India, that want to keep export opportunities in sensitive countries, even with a 5 percent segregation cost. Lastly, we find that the opportunity cost of segregation is much larger for sensitive importing countries than for countries adopting new GM crops, which suggests that sensitive importers will have the incentive to invest in separate non-GM marketing channels if exporting countries like India decide to adopt GM food crops." from Authors' AbstractGenetically modified food, International trade, Developing countries, Segregation,
Mejoramiento de la escritura a partir de una unidad didáctica en estudiantes de grado tercero de la institución educativa distrital Ismael Perdomo
No full textEste documento parte de la implementación de una unidad didáctica como propuesta de intervención en estudiantes con baja producción escrita, del grado tercero, jornada mañana del Colegio Ismael Perdomo, motivo por el cual se comenzó a trabajar basados en un diagnóstico como caracterización inicial del grupo, a partir de la prueba estandarizada (Batería de evaluación de los procesos de escritura) PROESC, la cual permitió evidenciar el nivel en el que se encontraban los participantes del proyecto; para luego diseñar e implementar la secuencia didáctica titulada “ Niños creativos y escritura consciente”, teniendo en cuenta las categorías de análisis y evaluación descritas en la prueba estandarizada, enfocando los contenidos a superar las barreras evidenciadas desde la producción escrita, a través de diez sesiones que le permitieron al estudiante desarrollar progresivamente su habilidades escriturales, para posteriormente aplicar la batería como pos- test y contrastar la evolución tanto de forma individual como grupal. Los autores que apoyaron el soporte conceptual del trabajo fueron: Díaz Barriga (2010) desde la construcción de una secuencia integrada con tres momentos específicos a tener en cuenta: motivación estudiantil considerando los conocimientos previos, aportes a los contenidos curriculares institucionales a través del desarrollo de temáticas centrales y la producción escrita como medio evolutivo del incremento de conocimiento, vocabulario y creatividad; esto transversalizado por el autor Cassany (1993) desde la escritura creativa como medio expresivo personal, desde donde se producen textos narrativos que cuentan: sucesos, relatos y vivencias surgidas desde los contenidos propuestos por la Unidad didáctica.This document is based on the implementation of a didactic unit as a proposal for intervention in students with low written production, third grade, tomorrow's day of the Ismael Perdomo School, reason for which work began based on a diagnosis as the initial characterization of the group, from the standardized test (Battery of evaluation of the writing processes) PROESC, which allowed to show the level in which the participants of the project were; to then design and implement the didactic sequence entitled "Creative children and conscious writing", taking into account the categories of analysis and evaluation described in the standardized test, focusing the contents to overcome the barriers evidenced from the written production, through ten sessions that allowed the student to progressively develop his writing skills, to later apply the battery as a post-test and to contrast the evolution both individually and in groups. The authors who supported the conceptual support of the work were: Díaz Barriga (2010) from the construction of an integrated sequence with three specific moments to be taken into account: student motivation considering the previous knowledge, contributions to institutional curricular contents through the development of central themes and written production as an evolutionary means of increasing knowledge, vocabulary and creativity; This is mainstreamed by the author Cassany (1993) from creative writing as a personal expressive medium, from which narrative texts are produced that tell: events, stories and experiences arising from the contents proposed by the didactic unit.1. Resumen. -- 2. Introducción. -- 3. Justificación. -- 4. Antecedentes. -- 5. Pregunta problémica. -- 6. Objetivo general. -- 7. Marco teórico. -- 8. Metodología. -- 9. Análisis de resultados. -- 10. Bibliografía. -- 11. [email protected]@[email protected]
The Ozonolysis of Cyclic Monoterpenes: A Computational Review
No full textMonoterpenes are prevalent organic compounds emitted to the atmosphere, via biogenic activities in various types of plants. Monoterpenes undergo atmospheric decomposition reactions derived by the potent atmospheric oxidizing agents, OH, O3, and NOx. This review critically surveys literature pertinent to the atmospheric removal of monoterpenes by ozone. In general, the ozonolysis reactions of monoterpenes occur through the so-called Criegee mechanism. These classes of reactions generate a wide array of chemical organic and inorganic low vapor- pressure (LVP) species. Carbonyl oxides, commonly known as Criegee Intermediates (CI's) are the main intermediates from the gas-phase ozonolysis reaction. Herein, we present mechanistic pathways, reactions rate constants, product profiles, thermodynamic, and kinetic results dictating the ozonolysis reactions of selected monoterpenes (namely; carene, camphene, limonene, ι-pinene, β-pinene, and sabinene). Furthermore, the unimolecular (vinyl hydroperoxide- and ester-channels), and bimolecular reactions (cycloaddition, insertion, and radical recombination) of the resulting CI's are fully discussed. The orientations and conformations of the resulting Primary Ozonides (POZ's) and CI's of monoterpenes are classified to reveal their plausible effects on reported thermo-kinetic parameters.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
A diachronic corpus-based study of taboo language in literary translation from English into Arabic
No full textThe present study is a quantitative as well as a qualitative corpus-based investigation of the Arabic translation of taboo language in three English novels, published in Arabic by well-known publishers in the Middle East in 1987, 1999 and 2010. The novels are Lady Chatterley’s lover by D. H. Lawrence (1960) translated as عشيق الليدي تشاترلي 'ashyq al-laydy tshātrly by Hana Aboud (1999), The garden of Eden by Ernest Hemingway (1986) translated as جنة عدن jnat ‘adn by Al Sharif Khatier (1987) and Sex and the city (2000 version) by Candace Bushnell translated as بنات المدينة bnāt al-mdīnāh by Abid Ismael (2010). The main research questions investigated in the study are: (1) What strategies are used for the translation of taboo language across the three novels investigated in this study, and are there any notable similarities and differences over time? (2) Is there any correspondence between particular translation strategies and different categories of taboo language, and do these correspondences show similarities or differences across the three novels and the timespan investigated? (3) Based on the above, how may social changes in the receiving system be seen to condition translation choices?
Corpus data are extracted from the source text of the English novels as well as the corresponding Arabic translated versions. A quantitative analysis is performed to set up a comparison of frequencies and distribution of taboo words, their categories, and the translation strategies employed by translators of the three novels, aiming at quantifying similarities or differences. The framework adopted for the analysis is based in the paradigm of Descriptive Translation Studies and uses Toury’s (1995) coupled-pairs method. The findings show that translation by a more general word is a predominant strategy, especially when translating sex-related items. However, there is a gradual growth in adopting literal translation strategies across the period included in this study which is explained by language change, and a change in social norms. Furthermore, a notable tendency to transliterate in the older translation is found which reflects translators’ individual differences in terms of their awareness of the target language vocabulary.</p
Discursive establishment of Knowledge Organization: H. E. Bliss and International Society for Knowledge Organization (ISKO)
No full textThe discourse of knowledge organization has been scientifically and institutionally reinforced by theInternational Society for Knowledge Organization - ISKO since the late twentieth century. This discourse often accredits to Bliss (1929, 1933) the origins of knowledge organization as an area of investigation based mainly on issues regarding classification systems and conceptual relation systems, such as the thesaurus. Acknowledging the fact that the term “knowledge organization” is already present in an article by Otlet (1903), this work consists of the observation and reflection on the possible theoretical associations between the concepts of Bliss and Otlet. The textual scope of this reflection includes, in addition to the already mentioned texts by Bliss and Otlet, works by Dahlberg (1993, 1995) and Hjørland (2003, 2008) who can be considered founders of a new discursive perspective. From the methodological point of view, this study was guided by a text by Michael Foucault - What is an author? (1992). Foucault believes that, as a name, the author is not only a reference, but also has other indicative functions. The results of this reflexive and interpretive study show that Dahlberg granted a special status to Bliss’s work, which implies that he and later authors developed those ideas and their applicability, establishing Bliss as the founder of a discourse, appropriated and reinterpreted by ISKO. Regarding Otlet, we verified that he is not the founder of a discourse linked to knowledge organization in ISKO’s approach. However, we verified that his work closely addresses the issue of information recovery, present in Hjorland. In this way, Otlet’s knowledge organization discourse can contribute and become associated with a discourse fostered by the ISKO.Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)Universidade Federal Fluminense (UFF)Instituto Brasileiro de Informações em Ciência e Tecnologia (IBICT)Universidade Estadual de Campinas (UNICAMP)Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP
Design an active verification mechanism for certificates revocation in OCSP for internet authentication
No full textNo doubt that data security online is crucial. Therefore, great attention has been paid to that aspect by companies and organizations given its economic and social implications. Thus, online certificate status protocol (OCSP) is considered one of the most prominent protocol functioning in this field, which offers a prompt support for certificates online. In this research, a model designed based on field programable gate array (FPGA) using Merkel’s tree has been proposed to overcome the delay that might have occurred in sorting and authentication of certificates. Having adopted this model and with the assistance of Hash function algorithm, more than 50% of certificates have been processed in comparison with standard protocol. Moreover, certificates have been provided with substantial storage space with high throughput. Basically, Hash function algorithm has been designed to arrange and specify a site of verified or denied certificates within time of validity to protect servers from intrusion and clients from using applications with harmful contents
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