Готові списки джерел за темами / Nature variables

Добірка наукової літератури з теми "Nature variables"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Зміст

Статті в журналах
Дисертації
Книги
Частини книг
Тези доповідей конференцій
Звіти організацій

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Nature variables".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Nature variables"

Li, Jia Jun, and Nan Ma. "Discussing Variables Nature in Internet of Things Growth." Applied Mechanics and Materials 409-410 (September 2013): 1604–7. http://dx.doi.org/10.4028/www.scientific.net/amm.409-410.1604.

Повний текст джерела

Анотація:

This paper uses principal component analysis to discuss variables nature, which affects Internet of Things (IOT) growth from input perspective. It discusses relevance of these variables and the goals of the research. Research shows that: in the stage of IOT growth, capital investment, science and technology investment are the main variables affecting industry growth, human investment is the secondary variable. Policy support is strongly correlated with the level of IOT development.

Стилі APA, Harvard, Vancouver, ISO та ін.

Magyar, N., T. Van Doorsselaere, and M. Goossens. "The Nature of Elsässer Variables in Compressible MHD." Astrophysical Journal 873, no. 1 (March 5, 2019): 56. http://dx.doi.org/10.3847/1538-4357/ab04a7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Mitchell, Imogen. "Nature and nurture: the future of predictor variables." Current Opinion in Critical Care 6, no. 3 (June 2000): 166–70. http://dx.doi.org/10.1097/00075198-200006000-00004.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Brummitt, Neil, Eugenie C. Regan, Lauren V. Weatherdon, Corinne S. Martin, Ilse R. Geijzendorffer, Duccio Rocchini, Yoni Gavish, Peter Haase, Charles J. Marsh, and Dirk S. Schmeller. "Taking stock of nature: Essential biodiversity variables explained." Biological Conservation 213 (September 2017): 252–55. http://dx.doi.org/10.1016/j.biocon.2016.09.006.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Shabani, S., and Gh Naser. "Dynamic Nature of Explanatory Variables in Water Demand Forecasting." Procedia Engineering 119 (2015): 781–87. http://dx.doi.org/10.1016/j.proeng.2015.08.934.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kerschbaum, Franz, Peter Habison, and Josef Hron. "On the Nature of Irregular Variables of Type Lb." Symposium - International Astronomical Union 177 (2000): 546. http://dx.doi.org/10.1017/s0074180900003107.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ellithorpe, Elizabeth A., Gaspard Duchene, and Steven W. Stahler. "The Nature of Class I Sources: Periodic Variables in Orion." Astrophysical Journal 885, no. 1 (October 31, 2019): 64. http://dx.doi.org/10.3847/1538-4357/ab4651.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Russell, Stephen C. "RV Tau Variables in Globular Clusters: Clues on Their Nature?" Publications of the Astronomical Society of Australia 15, no. 2 (1998): 189–93. http://dx.doi.org/10.1071/as98189.

Повний текст джерела

Анотація:

AbstractWe report on the detailed elemental abundances of RV Tau variables that reside in globular clusters, and how they compare with those of RV Tau variables in the field. Surprisingly, they seem to show definite differences, and at this stage, it is not clear why this is so.

Стилі APA, Harvard, Vancouver, ISO та ін.

Duarte, José Cantón, Mª Rosario Cortés Arboleda, and David Cantón-Cortés. "Variables Associated with the Nature of Sexual Abuse to Minors." Spanish journal of psychology 15, no. 2 (July 2012): 571–81. http://dx.doi.org/10.5209/rev_sjop.2012.v15.n2.38868.

Повний текст джерела

Анотація:

This study analyzes the prevalence and characteristics of childhood and adolescence sexual abuse suffered by a sample of university students, as well as the variables associated with the nature of abuse. Participants anonymously completed the Questionnaire on Child Sexual Abuse, in order to obtain information about experience of sexual abuse. Of a total of 2,375 students, 289 (12.2%) declared having suffered sexual abuse before the age of 18. The invasiveness, continuity, and severity of abuse was related to the location where the abuse took place (the more severe cases were committed in the homes of the victim and perpetrator) and to the circumstances of abuse (relationships with partners/at a party or while caring for a child predicted more severe abuse). The age of the victim (preschool) and an intrafamilial relationship between victim and perpetrator were also related to more invasive, continuous, and severe sexual abuse. The knowledge of characteristics of perpetrator and victim and the context in which sexual abuse occurs can help to better comprehend the nature and correlates of sexual abuse. The results of the present study may contribute to the design of programs for the prevention of sexual abuse to minors.

Стилі APA, Harvard, Vancouver, ISO та ін.

Feast, Michael. "AGB variables as distance indicators." International Astronomical Union Colloquium 193 (2004): 304–12. http://dx.doi.org/10.1017/s0252921100010836.

Повний текст джерела

Анотація:

AbstractEvidence for the existence of Mira Period-Luminosity relations is reviewed including recent work on Miras with thick circumstellar shells. The calibration of the relation at K is discussed in detail. The nature of variables deviating from the PL relation and possible metallicity effects are also discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Дисертації з теми "Nature variables"

Jones, William I. "Examining Preservice Science Teacher Understanding of Nature of Science: Discriminating Variables on the Aspects of Nature of Science." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284776708.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Fields, Alexander James. "Nature of anger in the workplace| Exploration of relevant variables and their structure." Thesis, The University of Texas at San Antonio, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1605134.

Повний текст джерела

Анотація:

In the workplace, counter productive work behaviors (CWBs) are strongly discouraged. Vardi and Weitz (2004) concluded that counter productive work behaviors are a fairly common occurrence and cost businesses billions of dollars each year. Many of these CWBs are perpetrated by angry or disgruntled employees. When angry employees are identified they can be helped with coping strategies to productively manage their anger, as opposed to engaging in CWBs (Hargrave, Hiatt, Dannenbaum, & Shaffer, 2008). This paper seeks to better equip professionals and researchers with tools to identify these at risk employees. Specifically the Anger Parameters Scales (APS) and the Anger Expressions Scale (AES) have been examined in a workplace sample for the first time. Additionally this study has examined the use of more readily available demographic information to predict at risk persons. The expected factors of the measures in question did not emerge as predicted by the AES. The factor structure of the APS was partially validated as four of the five scales loaded well enough for further analysis. None of these scales could be captured by more available demographic variables. This study also gathered normative data on anger elicitors by means of coding narratives of participants who were asked to describe a typical anger provoking situation.

Стилі APA, Harvard, Vancouver, ISO та ін.

DiPietro, Domenic J. "Effects of Nature and City Sounds on Physiological and Psychological Variables in College Students." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1597857209685718.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pollard, Karen R. "The nature of the low mass supergiants : RV Tauri and R Coronae Borealis variables." Thesis, University of Canterbury. Astronomy, 1994. http://hdl.handle.net/10092/7632.

Повний текст джерела

Анотація:

A programme of photometric and spectroscopic observations has been undertaken in order to investigate the physical and chemical characteristics of the RV Tauri and R Coronae Borealis variables. These characteristics have, in turn, been used to examine a variety of theoretical models that attempt to describe the pulsation mechanisms, the underlying physical nature and the evolutionary status of these low mass supergiant variables. Long time baseline BVRI photometry was obtained at the Mt John University Observatory (MJUO) over intervals of between 750 and 1300 days for eleven of the RV Tauri variables. RV Tauri stars from both the RVa (constant mean magnitude) and RVb (varying mean magnitude) photometric subclasses and from all three spectroscopic Preston subtypes (A, B and C types) were included in the programme. Fourier and least-squares analyses of the light and colour variations have revealed the dominant periodicities and the stability of the pulsation in these stars. A harmonic (f + 2f) fit was found to be a good representation of the "deep-shallow" nature of both the light and colour curves in most stars. Contemporaneous high-resolution spectroscopy of these objects was acquired at MJUO and at the Mt Stromlo Observatory. This enabled us to link the photometric variations and the radial motions in these stars' atmospheres and to relate any photometric and spectral peculiarities. The appearance and phase-dependent behaviour of the Hα line profiles and the radial velocities were examined. Shock-related features, such as line doubling and recombination emission lines, were observed in all the programme stars. The observed Hα profiles were consistent with two enhancements of Hα emission following the passage of the primary and secondary shock waves through the photosphere around phases 0.2 and 0.6. In addition, the metallic lines showed profiles characteristic of an atmospheric shock wave at these phases. The derived spectroscopic and the photometric characteristics have been used to examine a variety of theoretical models that attempt to describe the pulsation mechanisms and the underlying physical nature of the RV Tauri stars. The nature of the RVb subclass and the interpretation that the RVa and RVb stars actually represent a continuum of properties is discussed in detail. A model of a binary system which undergoes periodic eclipses by dust or which interacts at certain orbital phases is presented. Two scenarios were proposed to explain the observed properties: an 'obscuration' model where the star is eclipsed by dust in the binary system; or an 'interaction' scenario where the two stars interact in some manner at a particular orbital phase. The interaction model generally has better agreement with the observed properties although it is quite likely, in a system where circumstellar and/or circumbinary material is known to exist, that a combination of obscuration and interaction is possible. A detailed analysis of the chemical composition of a number of RCB stars in the Galaxy and the Large Magellanic Cloud is presented. This study made use of high-resolution echelle spectra obtained at the Anglo-Australian Telescope. The results for the galactic star, SU Tau, revealed very similar properties to a number of other warm galactic RCB stars, most notably R CrB. This was the first abundance analysis completed for any extragalactic RCB stars and showed a similar abundance distribution to the galactic RCB stars. All these objects (galactic and extragalactic) have a reasonably consistent set of properties, providing evidence that it is possible for this phenomenon to exist in different nucleosynthetic environments.

Стилі APA, Harvard, Vancouver, ISO та ін.

Bastille-Denis, Emmanuelle. "La nature et le rôle des variables psychologiques comme facteurs de maintien du trouble lié à l'horaire de travail." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26289.

Повний текст джерела

Анотація:

Pour les travailleurs de nuit, le sommeil revêt un caractère particulier. En effet, le travail de nuit implique de modifier le cycle éveil-sommeil en fonction de l’horaire de travail, ce qui amène les travailleurs à dormir le jour alors que leur horloge biologique interne favorise plutôt l’éveil. Certains travailleurs en viennent à développer un trouble du sommeil qui s’appelle le trouble lié à l’horaire de travail (THT). Cette thèse doctorale vise à élargir la conceptualisation actuelle dominante de ce trouble, en étudiant les cognitions, les comportements incompatibles avec le sommeil et les processus anxieux comme facteurs de maintien du THT. Le premier objectif vise à étudier la nature des cognitions avant l’endormissement dans le THT. Le deuxième objectif est d’étudier la présence de cognitions dysfonctionnelles et de comportements incompatibles avec le sommeil dans le THT. Un dernier objectif vise à explorer le thème des inquiétudes concernant le sommeil et la présence du processus de catastrophisation avant l’endormissement dans le THT. Quarante-sept travailleurs de nuit ont participé à l’étude. Les participants ont été divisés en deux groupes : 25 personnes présentant un THT et 22 personnes étant de bons dormeurs (BD) satisfaits de leur sommeil. L’étude comporte des mesures autorapportées ainsi que des entrevues en face-à-face ciblant les différents thèmes de pensées avant l’endormissement, les pensées et croyances dysfonctionnelles, les pensées intrusives, les stratégies de contrôle des pensées, les biais attentionnels, les inquiétudes portant sur le sommeil ainsi que les comportements incompatibles avec le sommeil. Les résultats du premier article démontrent que le groupe THT porte significativement plus son attention sur les soucis et les préoccupations ainsi que sur les bruits à l’intérieur ou à l’extérieur de la maison que les BD. Les personnes souffrant de THT ont davantage d’activation cognitive avant l’endormissement et ont une efficacité du sommeil plus faible comparées aux BD. Les résultats du deuxième article révèlent que 77 % des participants ont pris part au processus de catastrophisation. Parmi les thèmes mentionnés se trouvent la fatigue et le niveau d’énergie, les difficultés reliées à l’humeur et la performance au travail. Ces résultats suggèrent que des cognitions et comportements contribuent au maintien du THT. Des études futures devraient viser à approfondir les facteurs psychologiques impliqués dans ce trouble.

Стилі APA, Harvard, Vancouver, ISO та ін.

Przyjemski, Katrina. "Natural language variables : variable-based semantic theories of pronouns and proper names." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:2ec9cd7c-5fe3-4dd5-ae3b-e94e317246c1.

Повний текст джерела

Анотація:

Semanticists, philosophers and logicians have standardly analyzed a range of natural language expressions on the model of the variables of formal languages. This dissertation explores variable- based semantic theories of pronounsand proper names. The first two chapters argue that a variable-based, presuppositional semantics for pronouns proposed by Cooper (1979, 1983) resolves an apparent trilemma arising from the conjunction of three plausible commitments concerning the semantics of pronouns: that some anaphoric pronouns with quantifier antecedents are bound variables, that referential pronouns have context-independent meanings, and that the relation between bound and referential pronouns is not ambiguity or homonymy. The first chapter argues that Cooper’s semantics is descriptively and empirically superior to alternative theories, including Kaplan’s account, which does not resolve the trilemma. The second addresses an important objection to the view that bound and referential pronouns make the same semantic contribution, involving cases where bound pronouns do not appear to trigger semantic presuppositions. I argue that this appearance is misleading: bound pronouns do trigger semantic presuppositions and have the same (Cooper-style) denotations as referential pronouns. The third chapter addresses the phenomenon of non c-command or ‘donkey’ anaphora. These anaphors appear to require a departure from Cooper’s semantics and, more generally, from the view that anaphoric pronouns correspond to (classical) bound variables. I consider D-type accounts of donkey anaphora and argue that these accounts must be revised in ways that bring the denotations of donkey anaphors closer to those of ordinary bound and referential pronouns. The last chapter asks whether proper names require a variable-based semantics. I consider a pair of recent anaphoric theories of proper names, according to which proper names have anaphoric uses and are thus better modeled as variables. I argue that there are important reasons to reject a variable-based model for proper names, in contrast with pronouns.

Стилі APA, Harvard, Vancouver, ISO та ін.

Sarrazin, Philippe. "Motivation a l'accomplissement dans les activites motrices : mise en evidence de processus et variables affectant les croyances relatives a la nature de l'habilete motrice, le choix d'une difficulte, l'effort fourni et la performance." Paris 11, 1995. http://www.theses.fr/1995PA112394.

Повний текст джерела

Анотація:

Ce travail a pour objectif de mettre en evidence certaines variables et processus qui affectent la motivation a l'accomplissement, dans les activites motrices. Il s'appuie sur des donnees issues du paradigme expectation-valence (vroom, 1964), et des theories socio-cognitives contemporaines sur les buts (nicholls, 1989). La premiere partie presente les concepts et theories de la motivation en generale, et de la motivation a l'accomplissement en particulier. Les notions d'expectation, de valence et de motivation a l'accomplissement y sont particulierement developpees. La deuxieme est un approfondissement theorique des deux variables independantes principales (l'orientation motivationnelle vers la maitrise et vers la competition, et l'habilete percue en escalade), assorti de la validation d'outils destines a les mesurer. La troisieme partie propose 1 etude et 7 experimentations regroupees selon 4 themes: les croyances relatives a la nature de l'habilete motrice, le choix d'un niveau de difficulte de la tache, l'effort et la perseverance dans la tache, et la performance. Dans ce qu'ils ont d'essentiel, nos resultats montrent qu'avec un but de competition, la motivation est tributaire d'une perception favorable de son habilete par rapport a autrui. Ce processus peut entrainer des pis-aller quand l'habilete percue est faible: la selection de difficultes extremes, l'adoption de strategies de moindre effort ou le rejet de la situation. Par contraste, quelle que soit l'habilete percue, un but de maitrise entraine la selection d'une tache de defi personnel, et un investissement important et durable, particulierement pour ce type de difficulte. La consistance des resultats valide dans un contexte ecologique et avec une tache motrice d'escalade les hypotheses avancees par certaines theories socio-cognitives contemporaines, celles de nicholls (1989) en particulier, et consacre la valeur du paradigme expectation-valence pour expliquer le fonctionnement de la motivation humaine

Стилі APA, Harvard, Vancouver, ISO та ін.

Stump, Simon. "Natural enemies in a variable world." Thesis, The University of Arizona, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3718576.

Повний текст джерела

Анотація:

First, I study natural enemies in tropical forests, using both theory and empirical work. In tropical forests, most natural enemies are thought have a narrow host range, and be distance-responsive (i.e., mainly harm seeds and seedlings that are near adults of their main host). Previous theoretical work has shown that specialized natural enemies can maintain diversity of their prey, whether or not they are distance-responsive. However, it is unknown whether specialist natural enemies are more or less able to promote prey coexistence if they are distance-responsive. Using theoretical models, I show that distance-responsive predators are less able to maintain diversity. Additionally, I show that habitat partitioning does not interfere with the ability of distance-responsive predators to maintain diversity, even if it causes seedling survival to be highest near conspecific adults.

From an empirical aspect, I studied the host range of seed-associated fungi. Soil-borne microbes, such as fungi, are thought to play an important role in maintaining diversity in tropical forests. However, the microbial community itself is often treated as a black box, and little is known about which microbes are causing major effects, or how specialized seed-microbe associations are. Here I use experimental inoculations to examine the host range and effect of a guild of seed-associated fungi that are thought to be mainly pathogens. I show that fungal species are differentially able to colonize different seed species, and have species-specific effects on seed germination. I show that in many cases, plant phylogeny, and to a lesser extent fungus phylogeny, are good predictors of colonization.

Finally, I study how an optimally foraging granivore can promote (or undermine) coexistence amongst annual plants, using theory. Optimal foraging theory is one of the major theories for how predators behave; despite this, little is known about whether an optimally foraging predator could promote coexistence amongst a diverse community of prey. Previous models have shown than two species can coexist due to optimal foraging, but did not test whether multiple prey can coexist, nor if the effect is altered by environmental variation. Here, I show that if the predators specialize on different prey at different times, the predators can allow multiple prey species to coexist. In this case, environmental variation has little effect on the ability of predators to maintain diversity. If the predators are generalists, they cannot maintain diversity. Additionally, I show that generalist predators will create a negative storage effect, undermining coexistence.

Стилі APA, Harvard, Vancouver, ISO та ін.

Stump, Simon Maccracken. "Natural Enemies in a Variable World." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560856.

Повний текст джерела

Анотація:

Natural enemies are ubiquitous in nature. In many communities, natural enemies have a major effect on the diversity of their prey. Their effects are very diverse: they can promote or undermine the ability of their prey to coexist through a variety of mechanisms. As such, an important step in understanding how diversity is maintained will be to understand how different forms of predator behavior affect prey coexistence. In this dissertation, I study how two major types of predators affect plant coexistence in two different communities. First, I study natural enemies in tropical forests, using both theory and empirical work. In tropical forests, most natural enemies are thought have a narrow host range, and be distance-responsive (i.e., mainly harm seeds and seedlings that are near adults of their main host). Previous theoretical work has shown that specialized natural enemies can maintain diversity of their prey, whether or not they are distance-responsive. However, it is unknown whether specialist natural enemies are more or less able to promote prey coexistence if they are distance-responsive. Using theoretical models, I show that distance-responsive predators are less able to maintain diversity. Additionally, I show that habitat partitioning does not interfere with the ability of distance-responsive predators to maintain diversity, even if it causes seedling survival to be highest near conspecific adults. From an empirical aspect, I studied the host range of seed-associated fungi. Soilborne microbes, such as fungi, are thought to play an important role in maintaining diversity in tropical forests. However, the microbial community itself is often treated as a black box, and little is known about which microbes are causing major effects, or how 8 specialized seed-microbe associations are. Here I use experimental inoculations to examine the host range and effect of a guild of seed-associated fungi that are thought to be mainly pathogens. I show that fungal species are differentially able to colonize different seed species, and have species-specific effects on seed germination. I show that in many cases, plant phylogeny, and to a lesser extent fungus phylogeny, are good predictors of colonization. Finally, I study how an optimally foraging granivore can promote (or undermine) coexistence amongst annual plants, using theory. Optimal foraging theory is one of the major theories for how predators behave; despite this, little is known about whether an optimally foraging predator could promote coexistence amongst a diverse community of prey. Previous models have shown than two species can coexist due to optimal foraging, but did not test whether multiple prey can coexist, nor if the effect is altered by environmental variation. Here, I show that if the predators specialize on different prey at different times, the predators can allow multiple prey species to coexist. In this case, environmental variation has little effect on the ability of predators to maintain diversity. If the predators are generalists, they cannot maintain diversity. Additionally, I show that generalist predators will create a negative storage effect, undermining coexistence.

Стилі APA, Harvard, Vancouver, ISO та ін.

Bogaerts, Márquez María 1991. "Identification of environmental variables in Drosophila melanogaster natural populations." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2022. http://hdl.handle.net/10803/673159.

Повний текст джерела

Анотація:

Entender cómo las especies se adaptan al ambiente es aún una pregunta sin resolver en el campo de la Biología Evolutiva. Mientras el foco principal siempre ha estado en la base genética, los factores ambientales responsables de dichos procesos adaptativos se quedan por detrás. Nuestro objetivo principal es identificar las principales variables ambientales que contribuyen a la adaptación. Utilizamos poblaciones naturales de D. melanogaster de Europa y Norte América, y analizamos tanto SNPs como elementos transponibles (TEs). Para detectar y estimar las frecuencias de una población con precisión, actualizamos el algoritmo de T-lex y lanzamos una nueva versión: T-lex3. Realizamos un análisis de Asociación GenomaAmbiente (GEA) para awsociar las frecuencias alélicas de TEs y SNPs con las diferentes variables ambientales, e identificamos temperatura, lluvia y viento, como las variables más relevantes implicadas en la adaptación ambiental. Tambien encontramos 10 TEs asociados con al menos, una variable ambiental. Finalmente, desarrollamos una herramienta bioinfórmatica para integrar más de 200 genomas de D. melanogaster de todo el mundo, lo que facilitará los análisis ambientales espacial y temporalmente.
Understanding how species adapt to the environment is still an open question in Evolutionary Biology. While the focus has been on the genetic basis, the analysis of the environmental factors which drive these adaptive processes lags behind. Our main goal is to identify the main environmental variables that contribute to adaptation. We used natural D. melanogaster populations from Europe and North America, and analyzed both SNPs and transposable elements (TEs). To accurately detect and estimate TE population frequencies, we updated the T-lex algorithm and released a new version: T-lex3. We performed a Genome-Environment Analysis (GEA) to associate TEs and SNP allele frequencies with several environmental variables, and we identified temperature, rainfall and wind as the relevant variables involved in environmental adaptation. In addition, we found 10 TEs associated with an environmental variable. Finally, we developed a bioinformatic pipeline that integrates >200 D. melanogaster world-wide genomes, which will facilitate environmental analysis in space and time.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Книги з теми "Nature variables"

J, Carré Françoise, ed. Nonstandard work: The nature and challenges of changing employment arrangements. Ithaca, N.Y: Cornell University Press, 2000.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Shishkin, Andrey. Introduction to the axiomatic theory of elementary functions. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1209581.

Повний текст джерела

Анотація:

Contains an exposition of the basic concepts and theorems of the axiomatic theory of the basic elementary functions of real and complex variables. The textbook is written on the basis of lectures given by the author for a number of years at the Armavir State Pedagogical University, at the Slavyansk-on-Kuban State Pedagogical Institute and at the branch of the Kuban State University in Slavyansk-on-Kuban. It is intended for students of natural-mathematical profiles of preparation of the direction "Pedagogical education". It can be used in the study of mathematical analysis, the theory of functions of a real variable, the theory of functions of a complex variable, etc.

Стилі APA, Harvard, Vancouver, ISO та ін.

McCorkle, Constance M. A framework for analysis of gender and other socioeconomic variables in Ag&NRM. [East Lansing, Mich.]: Women in International Development, Michigan State University, 1994.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

P. D. T. A. Elliott. Arithmetic functions and integer products. New York: Springer-Verlag, 1985.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Babeshko, Lyudmila, and Irina Orlova. Econometrics and econometric modeling in Excel and R. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1079837.

Повний текст джерела

Анотація:

The textbook includes topics of modern econometrics, often used in economic research. Some aspects of multiple regression models related to the problem of multicollinearity and models with a discrete dependent variable are considered, including methods for their estimation, analysis, and application. A significant place is given to the analysis of models of one-dimensional and multidimensional time series. Modern ideas about the deterministic and stochastic nature of the trend are considered. Methods of statistical identification of the trend type are studied. Attention is paid to the evaluation, analysis, and practical implementation of Box — Jenkins stationary time series models, as well as multidimensional time series models: vector autoregressive models and vector error correction models. It includes basic econometric models for panel data that have been widely used in recent decades, as well as formal tests for selecting models based on their hierarchical structure. Each section provides examples of evaluating, analyzing, and testing models in the R software environment. Meets the requirements of the Federal state educational standards of higher education of the latest generation. It is addressed to master's students studying in the Field of Economics, the curriculum of which includes the disciplines Econometrics (advanced course)", "Econometric modeling", "Econometric research", and graduate students."

Стилі APA, Harvard, Vancouver, ISO та ін.

Mishenin, Sergey. Saving transportation resources: the experience of railway workers in Western Siberia 1965-1991. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1082937.

Повний текст джерела

Анотація:

The monograph is devoted to the generalization of the factors of railway transportation in Western Siberia and their influence on the formation of the experience of saving transportation resources in 1965-1991. The basic factors are considered such as the natural conditions and the production apparatus of the region, the development of a program-oriented approach to the development of the territory and the formation of the material base of railway transport in its space. These components are considered as historical challenges for the design of labor initiatives "from below". These initiatives are classified into three groups: speeding up the turnover of wagons, using the locomotive fleet, and saving fuel, energy, and other" variable " resources of the railway transportation process. The issues are considered taking into account the trends of fading opportunities for the Soviet model of system-wide development. It will be of interest to all those who are concerned about the history of Russia, the organization of its transport security system.

Стилі APA, Harvard, Vancouver, ISO та ін.

Collins, John. The Nature of Linguistic Variables. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199935314.013.004.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

VanDeRiet, Shirley J. Food discards: Nature, reasons for discard, and relationship to household variables. 1985.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Delsol, Laurent. Nonparametric Methods for α-Mixing Functional Random Variables. Редактори Frédéric Ferraty та Yves Romain. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780199568444.013.5.

Повний текст джерела

Анотація:

This article considers how functional kernel methods can be used to study α-mixing datasets. It first provides an overview of how prediction problems involving dependent functional datasets may arise from the study of time series, focusing on the standard discretized model and modelization that takes into account the functional nature of the evolution of the quantity to be studied over time. It then considers strong mixing conditions, with emphasis on the notion of α-mixing coefficients and α-mixing variables introduced by Rosenblatt (1956). It also describes some conditions for a Markov chain to be α-mixing; some useful tools that provide covariance inequalities, exponential inequalities, and Central Limit Theorem (CLT) for α-mixing sequences; the asymptotic properties of functional kernel estimators; the use of kernel smoothing methods with α-mixing datasets; and various functional kernel estimators corresponding to different prediction methods. Finally, the article highlights some interesting prospects for further research.

Стилі APA, Harvard, Vancouver, ISO та ін.

Nonstandard work: The nature and challenges of changing employment arrangements. Champaign, Ill: Industrial Relations Research Association, 2000.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Частини книг з теми "Nature variables"

Robinson, C. R., F. A. Córdova, and G. S. Stringfellow. "The Variable Nature of TT Ari in the Ultraviolet." In Cataclysmic Variables, 179. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0335-0_60.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Sekiguchi, Kazuhiro. "A Long Orbital Period and the Nature of V1017 Sgr: Inter-Relation." In Cataclysmic Variables, 181. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0335-0_62.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Tobias, Michael Charles, and Jane Gray Morrison. "Of Malignant Variables." In On the Nature of Ecological Paradox, 647–52. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64526-7_70.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Truran, J. W., and S. A. Glasner. "On the Nature of the Soft X-Ray Emission from Nova GQ Muscae 1983." In Cataclysmic Variables, 453–61. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0335-0_123.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pollini, F. "Remarks on the Hypothesis of Hidden Variables." In The Nature of Quantum Paradoxes, 343–52. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2947-0_16.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Di Nardo, E., and D. Senato. "Umbral nature of the Poisson random variables." In Algebraic Combinatorics and Computer Science, 245–66. Milano: Springer Milan, 2001. http://dx.doi.org/10.1007/978-88-470-2107-5_11.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Bolick, U., K. Beuermann, A. Bruch, and R. Lenzen. "The Nature of RW Sextantis." In Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 175–79. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3801-4_26.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Webbink, R. F., M. Livio, J. W. Truran, and M. Orio. "The Nature of Recurrent Novae." In Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 493–95. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3801-4_71.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Smak, J. "On the Nature of Dwarf Novae." In Cataclysmic Variables and Low-Mass X-Ray Binaries, 299. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5319-2_34.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Péquignot, D., and C. Morisset. "The nature of GQ Mus as depicted from photoionization models of the shell." In Cataclysmic Variables and Related Objects, 305–6. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0325-8_89.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Nature variables"

Lohokare, M. R., S. S. Pattnaik, S. Devi, B. K. Panigrahi, S. Das, and K. M. Bakwad. "Intelligent Biogeography-Based Optimization for discrete variables." In 2009 World Congress on Nature & Biologically Inspired Computing (NaBIC). IEEE, 2009. http://dx.doi.org/10.1109/nabic.2009.5393808.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kononov, Dmitry, C. Lacy, Vasily B. Puzin, Valery P. Kozhevnikov, Alexey Yu Sytov, and Anton P. Lyaptsev. "On the nature of quiescent light curves demonstrated by WZ Sge stars." In The Golden Age of Cataclysmic Variables and Related Objects IV. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.315.0031.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Harrison, Thomas E., Reba M. Bandyopadhyay, Stefanie Wachter, Dawn Gelino, and Christopher R. Gelino. "Cataclysmic Variables as Synchrotron Sources?" In A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP, 2008. http://dx.doi.org/10.1063/1.2945097.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Heinke, Craig O., Ashley J. Ruiter, Michael P. Muno, Krzysztof Belczynski, Reba M. Bandyopadhyay, Stefanie Wachter, Dawn Gelino, and Christopher R. Gelino. "Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space." In A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP, 2008. http://dx.doi.org/10.1063/1.2945021.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Hoard, D. W., S. Wachter, C. S. Brinkworth, S. Kafka, S. B. Howell, D. R. Ciardi, Reba M. Bandyopadhyay, Stefanie Wachter, Dawn Gelino, and Christopher R. Gelino. "What's Cool About Hot Stars? Infrared Observations of Cataclysmic Variables with the Spitzer Space Telescope." In A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP, 2008. http://dx.doi.org/10.1063/1.2945039.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Baert, Lieven, Charlotte Beauthier, Michaël Leborgne, and Ingrid Lepot. "Surrogate-Based Optimisation for a Mixed-Variable Design Space: Proof of Concept and Opportunities for Turbomachinery Applications." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43254.

Повний текст джерела

Анотація:

State-of-the-art turbomachinery design processes rely more and more on the extensive use of numerical simulations. To deal with expensive high-fidelity computations, surrogate-based optimisation (SBO) has become a very interesting approach. In order to cope with industrial cases, the capability to handle variables of a mixed nature appears key. Innovative and auto-adaptive surrogates have been implemented within Minamo that are capable of natively handling the different natures of the design parameters. The present work discusses this mixed-variable SBO framework applied to a multi-profile combinational problem inside the bypass duct. A proof of concept is given followed by a more advanced application. It is demonstrated that the proposed mixed-variable SBO efficiently delivers reliable results and that it offers many opportunities during a conceptual design phase.

Стилі APA, Harvard, Vancouver, ISO та ін.

Subbiah, N., and S. Krishna Kumar. "Achieving Reliability Growth by Probabilistic Design of Components Considering Strength Degradation of Materials and Stochastic Nature of Design Variables." In International Mobility Engineering Congress & Exposition 2005 - SAE India Technology for Emerging Markets. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-26-330.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Badhrinath, Krishnakumar, and J. R. Jagannatha Rao. "Bilevel Models for Optimum Designs Which Are Insensitive to Perturbations in Variables and Parameters." In ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0108.

Повний текст джерела

Анотація:

Abstract Design models may be subject to a variety of perturbations or uncertainties, such as in variables, parameters and the constraint right-hand sides. In this paper, we study the specific cases of deterministic variations in the variables and the parameters. The goal is to obtain designs that not only reduce cost but which are also insensitive to such perturbations. We formulate bilevel models for this purpose and illustrate with examples the nature of insensitive designs, as well as the singularities that occur in such bilevel models.

Стилі APA, Harvard, Vancouver, ISO та ін.

Patnaik, Sansit, and Fabio Semperlotti. "Modeling Nonlinear Oscillators via Variable-Order Fractional Operators." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97944.

Повний текст джерела

Анотація:

Abstract Fractional derivatives and integrals are intrinsically multiscale operators that can act on both space and time dependent variables. Contrarily to their integer-order counterpart, fractional operators can have either fixed or variable order (VO) where, in the latter case, the order can also be function of either independent or state variables. When using VO differential governing equations to describe the response of dynamical systems, the order can evolve as a function of the response itself therefore allowing a natural and seamless transition between largely dissimilar dynamics (e.g. linear, nonlinear, and even contact problems). Such an intriguing characteristic allows defining governing equations for dynamical systems that are evolutionary in nature. In this study, we present the possible application of VO operators to a class of nonlinear lumped parameter models that has great practical relevance in mechanics and dynamics. Specific examples include hysteresis and contact problems for discrete oscillators. Within this context, we present a methodology to define VO operators capable of capturing such complex physical phenomena. Despite using simplified lumped parameters nonlinear models to present the application of VO operators to mechanics and dynamics, we provide a more qualitative discussion of the possible applications of this mathematical tool in the broader context of continuous multiscale systems.

Стилі APA, Harvard, Vancouver, ISO та ін.

Aggarwal, Kush, Ruth Jill Urbanic, Luv Aggarwal, and Syed Saqib. "Identifying Relative Importance of Input Parameter(s) for Developing Predictive Model for Laser Cladding Process." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37719.

Повний текст джерела

Анотація:

Laser cladding (LC) is a multi-variable coating process which consists of process multiple inputs and associated bead geometry outputs. Fabrication of a desired clad bead geometry configuration is expensive, as it involves investment of specialized raw materials, specialty equipment, and time resources. Hence, it is vital to determine factors/inputs that affect the overall physical bead geometry parameters (response variables), and the nature of the responses. The objective of this research is to identify the extent of the contribution of each factor and impact of their interactions on the output which is essential in developing effective predictive models. Analysis of variance (ANOVA) and sensitivity analysis methodologies are studied in this research to determine the most significant process factors that relate to the shape parameters for a typical laser cladding production process scenario. A set of statistical based summaries for all response variables are presented. This includes contour and surface plots to illustrate the difference in effects for a response variable by a single process parameter as compared to two or more interacting process parameters. Finally, an optimization solver toolbox is applied to determine single and multiple objective optimization results that can be obtained for various desired bead geometries.

Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Nature variables"

Yépez, Ariel, Luis San Vicente Portes, and Santiago Guerrero. Productivity and Energy Intensity in Latin America. Inter-American Development Bank, April 2021. http://dx.doi.org/10.18235/0003219.

Повний текст джерела

Анотація:

Within an industrial setting, what would ones conjecture be about the relation between Energy Intensity (EI) and productivity? Could higher Energy use be associated to more capital intensive processes, and thus higher output (per worker)? Or Ceteris paribus, are productivity indicators inversely associated with energy intensity? So that more productive firms or industries tend also to be more energy efficient. The nature of this question is multifold as there are historical, geographical, institutional, developmental, and policy variables that jointly affect industrial development as well as a nations energy supply. This study seeks to assess the relationship between these variables in the industrial sector of four Latin American countries. Under alternative measures of productivity, namely, average labor productivity and total factor productivity (TFP), we find a statistically negative relationship between productivity and Energy intensity.

Стилі APA, Harvard, Vancouver, ISO та ін.

Hauzenberger, Niko, Florian Huber, Gary Koop, and James Mitchell. Bayesian modeling of time-varying parameters using regression trees. Federal Reserve Bank of Cleveland, January 2023. http://dx.doi.org/10.26509/frbc-wp-202305.

Повний текст джерела

Анотація:

In light of widespread evidence of parameter instability in macroeconomic models, many time-varying parameter (TVP) models have been proposed. This paper proposes a nonparametric TVP-VAR model using Bayesian additive regression trees (BART). The novelty of this model stems from the fact that the law of motion driving the parameters is treated nonparametrically. This leads to great flexibility in the nature and extent of parameter change, both in the conditional mean and in the conditional variance. In contrast to other nonparametric and machine learning methods that are black box, inference using our model is straightforward because, in treating the parameters rather than the variables nonparametrically, the model remains conditionally linear in the mean. Parsimony is achieved through adopting nonparametric factor structures and use of shrinkage priors. In an application to US macroeconomic data, we illustrate the use of our model in tracking both the evolving nature of the Phillips curve and how the effects of business cycle shocks on inflationary measures vary nonlinearly with movements in uncertainty.

Стилі APA, Harvard, Vancouver, ISO та ін.

Van Hook, W. A. The effect of pressure, isotopic (H/D) substitution, and other variables on miscibility in polymer-solvent systems. The nature of the demixing process; dynamic light scattering and small angle neutron scattering studies. Final report. Office of Scientific and Technical Information (OSTI), January 2000. http://dx.doi.org/10.2172/765324.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Islam, Asiya, and Preeti Manchanda. Gender Inequalities in Digital India: A survey on digital literacy, access, and use. Digital Futures at Work Research Centre (Digit), January 2023. http://dx.doi.org/10.20919/mcuu2363.

Повний текст джерела

Анотація:

This paper reports the main findings from a survey on gender inequalities in digital literacy, use, and access among youth (18-25 years) in three parts of India – Delhi, Uttar Pradesh, and Bihar. In addition to gender, the survey was attentive to other inequalities too in its enquiry about the location (urban/rural), caste, household income, and education level of the respondents. This paper largely presents inequalities of gender as they intersect with urban/rural location since other variables, while important, yielded smaller numbers that need further careful analysis. The survey was informed by various contemporary developments – global growth in the use of digital technology for education, employment, and everyday lives; Covid-19 pandemic that has accelerated this growth; and the Digital India programme that aims to empower citizens through digital skilling. The survey, then, set out to explore the nature and implications of social inequalities in a society moving towards digital empowerment. The survey findings reveal overwhelming dependence among young people on smartphones for internet access and that entertainment and social media are the top uses of the internet. The survey also finds that women, particularly in rural areas, are less likely than men to exclusively own smartphones. That is, the smartphones that women have access to tend to be ‘household phones’, shared with other members of the family. This has consequences for the time and purposes that women are able to use smartphones and internet for. Based on these findings, the paper proposes avenues for further research on intersectional inequalities in digital literacy, access, and use. It also suggests policy interventions to maximise the potential of digital technology for education and employment, with specific attention to gender inequalities.

Стилі APA, Harvard, Vancouver, ISO та ін.

Angrist, Joshua, and Alan Krueger. Instrumental Variables and the Search for Identification: From Supply and Demand to Natural Experiments. Cambridge, MA: National Bureau of Economic Research, September 2001. http://dx.doi.org/10.3386/w8456.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Henderson, Jan A., Robin D. Lesher, David H. Peter, and Chris D. Ringo. A landscape model for predicting potential natural vegetation of the Olympic Peninsula USA using boundary equations and newly developed environmental variables. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2011. http://dx.doi.org/10.2737/pnw-gtr-841.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Russo, David, and William A. Jury. Characterization of Preferential Flow in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, October 2001. http://dx.doi.org/10.32747/2001.7580681.bard.

Повний текст джерела

Анотація:

Preferential flow appears to be the rule rather than the exception in field soils and should be considered in the quantitative description of solute transport in the unsaturated zone of heterogeneous formations on the field scale. This study focused on both experimental monitoring and computer simulations to identify important features of preferential flow in the natural environment. The specific objectives of this research were: (1) To conduct dye tracing and multiple tracer experiments on undisturbed field plots to reveal information about the flow velocity, spatial prevalence, and time evolution of a preferential flow event; (2) To conduct numerical experiments to determine (i) whether preferential flow observations are consistent with the Richards flow equation; and (ii) whether volume averaging over a domain experiencing preferential flow is possible; (3) To develop a stochastic or a transfer function model that incorporates preferential flow. Regarding our field work, we succeeded to develop a new method for detecting flow patterns faithfully representing the movement of water flow paths in structured and non-structured soils. The method which is based on application of ammonium carbonate was tested in a laboratory study. Its use to detect preferential flow was also illustrated in a field experiment. It was shown that ammonium carbonate is a more conservative tracer of the water front than the popular Brilliant Blue. In our detailed field experiments we also succeeded to document the occurrence of preferential flow during soil water redistribution following the cessation of precipitation in several structureless field soils. Symptoms of the unstable flow observed included vertical fingers 20 - 60 cm wide, isolated patches, and highly concentrated areas of the tracers in the transmission zone. Soil moisture and tracer measurements revealed that the redistribution flow became fingered following a reversal of matric potential gradient within the wetted area. Regarding our simulation work, we succeeded to develop, implement and test a finite- difference, numerical scheme for solving the equations governing flow and transport in three-dimensional, heterogeneous, bimodal, flow domains with highly contrasting soil materials. Results of our simulations demonstrated that under steady-state flow conditions, the embedded clay lenses (with very low conductivity) in bimodal formations may induce preferential flow, and, consequently, may enhance considerably both the solute spreading and the skewing of the solute breakthrough curves. On the other hand, under transient flow conditions associated with substantial redistribution periods with diminishing water saturation, the effect of the embedded clay lenses on the flow and the transport might diminish substantially. Regarding our stochastic modeling effort, we succeeded to develop a theoretical framework for flow and transport in bimodal, heterogeneous, unsaturated formations, based on a stochastic continuum presentation of the flow and a general Lagrangian description of the transport. Results of our analysis show that, generally, a bimodal distribution of the formation properties, characterized by a relatively complex spatial correlation structure, contributes to the variability in water velocity and, consequently, may considerably enhance solute spreading. This applies especially in formations in which: (i) the correlation length scales and the variances of the soil properties associated with the embedded soil are much larger than those of the background soil; (ii) the contrast between mean properties of the two subdomains is large; (iii) mean water saturation is relatively small; and (iv) the volume fraction of the flow domain occupied by the embedded soil is relatively large.

Стилі APA, Harvard, Vancouver, ISO та ін.

Christoforidou, Eirini, Antonio Bobet, Tommy Nantung, and Philippe L. Bourdeau. Use of Geosynthetics on Subgrade and on Low and Variable Fill Foundations. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317437.

Повний текст джерела

Анотація:

There are significant problems during construction to establish an adequate foundation for fills and/or subgrade for pavements when the natural ground has low-bearing soils. Geosynthetics such as geogrids, geotextiles, and/or geocells could provide a less time-consuming, costly alternative for establishing an adequate foundation for the fill and/or subgrade. There is extensive evidence in the literature and on DOTs practices about the suitability of using geotextiles in pavements as separators. Previous studies have also shown that the use of geogrids in flexible pavements as a reinforcing mechanism could decrease the thickness of the base layer and/or increase the life of the pavement. In this study, analyses of selected pavement designs using Pavement ME—while considering geogrid-enhanced base or subgrade resilient modulus values—showed that geogrid-reinforcement, when placed at the interface between subgrade and base, did not produce significant benefits and only a modest increase in pavement life was predicted. In addition, parametric finite element analyses were carried out to investigate the potential benefits of placing a geogrid at the base of a fill over a localized weak foundation zone. The analyses showed that the use of geogrids is beneficial only when: (a) the stiffness of the weak foundation soil is about an order of magnitude smaller than the rest of the foundation soil; and (b) the horizontal extent of the weak foundation soil is at least 30% of the base of the embankment foundation. The largest decrease in differential settlements at the surface of the fill, resulting from geogrid-reinforcement, was less than 20% and, therefore, it is unlikely that the sole use of geogrids would be sufficient to mitigate differential settlements. Based on previous studies, a geocell mattress, which is a three-dimensional geosynthetic filled with different types of materials, could act as a stiff platform at the base of an embankment and bridge over weak zones in the foundation. However, given the limited experience in Indiana on the use of geocells, further research is required to demonstrate that geocells can be effectively used in place of other reinforcement methods.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ayala-García, Jhorland, and Sandy Dall’Erba. The impact of preemptive investment on natural disasters. Banco de la República, September 2021. http://dx.doi.org/10.32468/dtseru.301.

Повний текст джерела

Анотація:

Extreme rainfall events are expected to become more frequent and more intense in the future. Because their mitigation is a challenge and their cost to human life is large, this paper studies the impact of preemptive investment against natural disasters on the future occurrence of landslides and the losses associated with it. Based on a panel of 746 Colombian municipalities with medium and high risk of landslides and an instrumental variable approach, we find that preemptive public investment can reduce the number of landslides, the number of people who die, are injured, or disappear after a landslide, as well as the number of people affected. However, we do not find any effect on the number of houses destroyed. The results reveal that local governments focus their preventive measures on saving the lives and the physical integrity of their citizens, but they pay less attention to the direct market losses of natural disasters. These results are relevant in the presence of imperfect private insurance markets and increased informal settlements.

Стилі APA, Harvard, Vancouver, ISO та ін.

Meneses, Juan Francisco, and José Luis Saboin. Growth Recoveries (from Collapses). Inter-American Development Bank, July 2021. http://dx.doi.org/10.18235/0003419.

Повний текст джерела

Анотація:

This paper analyzes the behavior of a long list of economic variables during episodes of recovery from an economic collapse. A set of stylized facts is proposed so as to depict what in this work is called \saygrowth recoveries. Through different estimation techniques, it is inferred under which conditions and policies the likelihood of experiencing a growth recovery increases. The results of the paper indicate that collapses tend to occur in countries with high dependence on natural resource rents, macroeconomic mismanagement, low levels of democratic accountability and rule of law and high levels of conflict. Recoveries, on the other hand, tend to be longer than collapses and are more likely to occur in contexts of: improved external conditions, less natural resource rents, balanced fiscal accounts, where the exchange rate corrects but within a more fixed exchange rate regime and a more restricted financial account, and where there are: rebounds in private consumption, increases in international trade and improvements on property rights.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!