Bibliographies thématiques / Density manipulation

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Littérature scientifique sur le sujet « Density manipulation »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 7 février 2022

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Articles de revues sur le sujet "Density manipulation"

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GOPKO, MIKHAIL, VICTOR N. MIKHEEV et JOUNI TASKINEN. « Positive density-dependent growth supports costs sharing hypothesis and population density sensing in a manipulative parasite ». Parasitology 144, no 11 (27 juin 2017) : 1511–18. http://dx.doi.org/10.1017/s0031182017001020.

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SUMMARYParasites manipulate their hosts’ phenotype to increase their own fitness. Like any evolutionary adaptation, parasitic manipulations should be costly. Though it is difficult to measure costs of the manipulation directly, they can be evaluated using an indirect approach. For instance, theory suggests that as the parasite infrapopulation grows, the investment of individual parasites in host manipulation decreases, because of cost sharing. Another assumption is that in environments where manipulation does not pay off for the parasite, it can decrease its investment in the manipulation to save resources. We experimentally infected rainbow trout Oncorhynchus mykiss with the immature larvae of the trematode Diplostomum pseudospathaceum, to test these assumptions. Immature D. pseudospathaceum metacercariae are known for their ability to manipulate the behaviour of their host enhancing its anti-predator defenses to avoid concomitant predation. We found that the growth rate of individual parasites in rainbow trout increased with the infrapopulation size (positive density-dependence) suggesting cost sharing. Moreover, parasites adjusted their growth to the intensity of infection within the eye lens where they were localized suggesting population density sensing. Results of this study support the hypothesis that macroparasites can adjust their growth rate and manipulation investment according to cost sharing level and infrapopulation size.
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Cattaneo, Matias D., Michael Jansson et Xinwei Ma. « Manipulation Testing Based on Density Discontinuity ». Stata Journal : Promoting communications on statistics and Stata 18, no 1 (mars 2018) : 234–61. http://dx.doi.org/10.1177/1536867x1801800115.

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In this article, we introduce two community-contributed commands, rddensity and rdbwdensity, that implement automatic manipulation tests based on density discontinuity and are constructed using the results for local-polynomial density estimators in Cattaneo, Jansson, and Ma (2017b, Simple local polynomial density estimators, Working paper, University of Michigan). These new tests exhibit better size properties (and more power under additional assumptions) than other conventional approaches currently available in the literature. The first command, rddensity, implements manipulation tests based on a novel local-polynomial density estimation technique that avoids prebinning of the data (improving size properties) and allows for restrictions on other features of the model (improving power properties). The second command, rdbwdensity, implements several bandwidth selectors specifically tailored for the manipulation tests discussed herein. We also provide a companion R package with the same syntax and capabilities as rddensity and rdbwdensity.
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Carlson, J. W., A. Jonas et S. G. Sligar. « Imaging and manipulation of high-density lipoproteins ». Biophysical Journal 73, no 3 (septembre 1997) : 1184–89. http://dx.doi.org/10.1016/s0006-3495(97)78150-5.

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Park, Sung-Yong, et Pei-Yu Chiou. « Light-Driven Droplet Manipulation Technologies for Lab-on-a-Chip Applications ». Advances in OptoElectronics 2011 (30 octobre 2011) : 1–12. http://dx.doi.org/10.1155/2011/909174.

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Droplet-based (digital) microfluidics has been demonstrated in many lab-on-a-chip applications due to its free cross-contamination and no dispersion nature. Droplet manipulation mechanisms are versatile, and each has unique advantages and limitations. Recently, the idea of manipulating droplets with light beams either through optical forces or light-induced physical mechanisms has attracted some interests, since light can achieve 3D addressing, carry high energy density for high speed actuation, and be patterned and dynamically reconfigured to generate a large number of light beams for massively parallel manipulation. This paper reviews recent developments of various optical technologies for droplet manipulation and their applications in lab-on-a-chip.
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Du, Zhijiang, et Hui Dong. « Optimal dimension of redundant manipulator using the workspace density function ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 230, no 11 (4 mai 2015) : 1787–94. http://dx.doi.org/10.1177/0954406215586009.

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The redundant manipulator has been broadly applied to various fields including industrial manufacturing, surgical manipulation and space exploration by providing high accuracy, flexibility, and efficiency. Particularly, the technology is capable of improving the assembling precision while simplifying the operation in complicated environments, and therefore of intense interest in industrial settings. For manipulator design, space occupation optimizing is a critical step and parameters of the flexible area, the shape and size of workspace have been commonly employed to evaluate the optimizing performance. In this paper, by combining the Fourier transform with the convolution theorem, we presented a workspace density function of redundant manipulator to describe the shape and size of workspace and flexibility. The workspace density function is an evaluation criterion to select the optimal geometric parameters for the manipulator. Based on the workspace density function shown in the simulation results section, the optimal design parameters were obtained. The approach presented in this paper holds the potential to improve the redundant manipulator design.
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Cho, Yasuo, Sunao Hashimoto, Nozomi Odagawa, Kenkou Tanaka et Yoshiomi Hiranaga. « Nanodomain manipulation for ultrahigh density ferroelectric data storage ». Nanotechnology 17, no 7 (10 mars 2006) : S137—S141. http://dx.doi.org/10.1088/0957-4484/17/7/s06.

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Massot, Manuel, Jean Clobert, Thierry Pilorge, Jane Lecomte et Robert Barbault. « Density Dependence in the Common Lizard : Demographic Consequences of a Density Manipulation ». Ecology 73, no 5 (octobre 1992) : 1742–56. http://dx.doi.org/10.2307/1940026.

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Joubert, F. J., M. H. du Plessis, E. D. Steenkamp et P. J. C. Stassen. « Manipulation of citrus trees for new higher-density orchards. » Journal of Applied Horticulture 04, no 01 (15 juin 2002) : 17–20. http://dx.doi.org/10.37855/jah.2002.v04i01.05.

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Gao, Shang, Felix Flicker, Raman Sankar, He Zhao, Zheng Ren, Bryan Rachmilowitz, Sidhika Balachandar et al. « Atomic-scale strain manipulation of a charge density wave ». Proceedings of the National Academy of Sciences 115, no 27 (18 juin 2018) : 6986–90. http://dx.doi.org/10.1073/pnas.1718931115.

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A charge density wave (CDW) is one of the fundamental instabilities of the Fermi surface occurring in a wide range of quantum materials. In dimensions higher than one, where Fermi surface nesting can play only a limited role, the selection of the particular wavevector and geometry of an emerging CDW should in principle be susceptible to controllable manipulation. In this work, we implement a simple method for straining materials compatible with low-temperature scanning tunneling microscopy/spectroscopy (STM/S), and use it to strain-engineer CDWs in 2H-NbSe2. Our STM/S measurements, combined with theory, reveal how small strain-induced changes in the electronic band structure and phonon dispersion lead to dramatic changes in the CDW ordering wavevector and geometry. Our work unveils the microscopic mechanism of a CDW formation in this system, and can serve as a general tool compatible with a range of spectroscopic techniques to engineer electronic states in any material where local strain or lattice symmetry breaking plays a role.
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SUDHALKAR, HEMALI A., et MARK W. JOHNSON. « PERFLUOROCARBON LIQUID MANIPULATION OF HIGH-DENSITY INTRAOCULAR FOREIGN BODIES ». RETINA 18, no 5 (1998) : 460–65. http://dx.doi.org/10.1097/00006982-199809000-00013.

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Thèses sur le sujet "Density manipulation"

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Latt, Kyaw Zin. « Manipulation of Molecular Charge Density Waves and Molecular Transport Systems ». Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557418915977344.

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Pardue, Daniel B. « Computational Studies of C–H/C–C Manipulation Utilizing Transition Metal Complexes ». Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801892/.

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Density Functional Theory (DFT) is an effective tool for studying diverse metal systems. Presented herein are studies of a variety of metal systems, which can be applied to accomplish transformations that are currently difficult/impossible to achieve. The specific topics studied utilizing DFT include: 1) C–H bond activation via an Earth-abundant transition metal complex, 2) C–H bond deprotonation via an alkali metal superbase, 3) and amination/aziridination reactions utilizing a CuI reagent. Using DFT, the transformation to methanol (CH3OH) from methane (CH4) was examined. The transition metal systems studied for this transformation included a model FeII complex. This first-row transition metal is an economical, Earth-abundant metal. The ligand set for this transformation includes a carbonyl ligand in one set of complexes as well as a phosphite ligand in another. The 3d Fe metal shows the ability to convert alkyls/aryls to their oxidized counterpart in an energetically favorable manner. Also, “superbasic” alkali metal amides were investigated to perform C—H bond cleavage. Toluene was the substrate of interest with Cs chosen to be the metal of interest because of the highly electropositive nature of this alkali metal. These highly electrophilic Cs metal systems allow for very favorable C—H bond scission with a toluene substrate. Finally, the amination and aziridination of C–H and C=C bonds, respectively, by a CuI reagent was studied. The mechanism was investigated using DFT calculations. Presently, these mechanisms involving the use of coinage metals are debated. Our DFT simulations shed some insight into how these transformations occur and ultimately how they can be manipulated.
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Virion, Hélène. « L'instance photographique : pour une requalification de la création en photographie ». Thesis, Paris 1, 2014. http://www.theses.fr/2014PA010531.

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L'instant comme l'instantanéité se confrontent à une ambiguïté temporelle. Ils se heurtent à une fragmentation, à laquelle la photographie ne saurait se résoudre. Elle ne saurait se contraindre à une coupe immobile du temps, car le sens ontologique de l'image photographique contemporaine glisse. Il se dérobe à l'ancrage passé, daté et révolu lié notamment à la pensée barthienne et nécessite une redéfinition détachée de la perception mortifère de La Chambre Claire. Il révèle les carences des outils théoriques susceptibles de saisir l'essence de la création photographique. Il nous engage dans une requalification de son élaboration, de sa substance, comme de son étude. Entre déstructuration et restructuration nous défendons une forme susceptible de repousser les bornes de l’instant vers une densité de temps, de drame. Nous composons une situation photographique dont les perspectives troublent, inquiètent, interrogent. Par une poïétique de la dérive, du manque et de l'incertitude, nous constituons un événement carencé. Nous déterminons une circonstance suffisamment pesante pour laisser planer sur l'instant le poids d'une tension. L'instance puiserait ainsi du manque, du doute, un ressort dramatique comme une hypothèse de recherche tournée vers une appréhension, non sans évoquer l'expérience éprouvante liée au défilement des images
Instant as immediacy confront them with temporal ambiguity. They come up against a fragmentation in which the photography couldn't be resolved. It couldn't be restrained itself to a stationary cutting time, because the ontological sense of contemporary photography slips. It eludes the past, dated and bygone idea linked to Barthes's thought especially and requires a redefinition detached of the deadly perception of the Camera Lucida. It reveals deficiency of theoretical tools open to capture the essence of creative photography. It commits us to an amendment of its elaboration, its substance and its study as well. Between destructuring and restructuring, we defend a form which is able to push away instant limits towards time and drama density. We compose a photographic situation whose prospects trouble, worry, question. We establish a deficient event, thanks to a poietic of drift, lack and a state of uncertainty. We also determine a sufficiently heavy circumstance to let the weight of a tension hang over the moment. So photographic pending would draw from lack and doubt, a dramatic device as a research hypothesis turned towards an apprehension, not without mentioning the trying experience of scrolling images
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Hunt, Benjamin Dean. « In vitro manipulation of urotensin-II receptor expression : implications of receptor density on ligand efficacy ». Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9284.

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Many urotensin-II (UT) receptor ligands characterised to date exhibit assay-dependent paradoxical agonist / antagonist properties. This activity is likely to be due to differences in UT receptor density between assays, especially between in vivo and in vitro systems. The present study characterised the effect of UT receptor density on the absolute and relative efficacies of experimental UT ligands (urantide and UFP-803). Two in vitro models were produced allowing the density of UT to be controlled in the presence of a fixed cellular background. 1. Ecdysone-inducible Chinese hamster ovary (CHO) cell-line, allowing UT transcription to be induced by a nuclear steroid hormone, (pon-A). 2. UT-targeting siRNAs, allowing UT translation to be inhibited in CHO cells expressing the human recombinant UT receptor (CHOhUT). The production and characterisation of the first of these models was problematic due to significant expression of UT in the absence of pon-A, therefore affording no advantage over classical in vitro systems. Two UT-targeting siRNAs were transfected into CHOhUT and were shown to knockdown UT expression by 94 & 73% at the mRNA level and 64 & 40% at the functional level. This model has allowed us to control UT receptor density in the presence of a fixed cellular background. We have shown that decreasing the density of UT in CHOhUT reduces the absolute efficacies of experimental UT ligands (urantide and UFP-803). We attribute this effect to reduced mass of ligand-receptor complexes. Reducing the density of UT in CHOhUT does not affect the relative efficacies of the same ligands. We attribute this effect to the absence of a UT receptor reserve over the range of UT densities used. A better understanding of system-dependent efficacy is crucial for effective use of UT ligands in the clinical setting. The technologies employed in this thesis represent an important avenue for future work.
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Gomes, Alexander Silveira. « Avaliação experimental da ocorrência de competição contemporânea entre espécies endêmicas de lagartos das dunas do Médio São Francisco, Ba ». Programa de pós-graduação em ecologia e biomonitoramento do instituto de biologia UFBA, 2005. http://www.repositorio.ufba.br/ri/handle/ri/9768.

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A existência de competição interespecífica está associada à sobreposição no uso de recursos limitados por espécies e à redução na disponibilidade de recurso para uma espécie pelo uso de recursos ou a apropriação antecipada por uma outra. Interações competitivas podem produzir um padrão de uso diferencial de recursos pelas espécies envolvidas, como aquele previamente detectado entre Tropidurus psammonastes (Tropiduridae) e Eurolophosaurus divaricatus (Tropiduridae) e Cnemidophorus sp n (Teiidae), espécies endêmicas de lagartos das dunas de Ibiraba, Bahia. Para testar as hipóteses de que a presença de T. psammonastes reduz a densidade local das outras duas espécies (o que indicaria existência de competição contemporânea forte) e o padrão de uso de micro-hábitat das mesmas (o que indicaria existência de competição contemporânea, embora fraca), realizei um experimento de campo com duração de 76 dias durante um período do ano em que o potencial para interações competitivas é alto (i.e., entre o final de seca e início das chuvas). Manipulei a densidade de T. psammonastes pela remoção de seus indivíduos de quatro unidades amostrais experimentais, avaliando o efeito sobre as outras duas espécies em comparação a quatro unidades amostrais não alteradas. Na situação controle, o padrão de uso de micro-hábitat das espécies foi o mesmo descrito em um estudo realizado entre 1995 e 1996 na mesma área. As situações controle e experimental foram comparadas através de testes de randomização (MRPP) com base nos dados totais e da última metade do experimento. Não detectei diferença significativa das densidades entre as unidades amostrais controle e experimentais para nenhuma das duas espécies, indicando que, caso estivesse ocorrendo competição, ela não foi suficientemente forte para gerar efeitos de curto prazo. Não detectei diferenças dos padrões de uso multivariado de 2micro-hábitat pelas espécies entre controle e experimento. Como as disponibilidades de micro-hábitat não variaram entre tratamentos, esse resultado indica que não fui capaz de detectar mesmo interações competitivas fracas entre T. psammonastes e as demais espécies. Um estudo anterior refutou a hipótese de que o padrão diferencial de uso de recursos por essas espécies pode ser explicado por inércia filogenética. O presente estudo corroborou o padrão de uso de micro-hábitat descrito anteriormente para as espécies, sugerindo que ele não é estocástico, e refutou a hipótese de que o padrão deriva de competição contemporânea. Desse modo, esse conjunto de evidências sugere que o padrão observado pode derivar de interações ecológicas competitivas passadas, o que, embora não testável, é plausível visto que as espécies envolvidas são endêmicas das dunas, apresentando distribuição geográfica restrita.
Salvador
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Yildirim, Handan. « STRUCTURAL, ELECTRONIC, VIBRATIONAL AND THERMODYNAMICAL PROPERTIES OF SURFACES AND NANOPARTICLES ». Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3533.

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The main focus of the thesis is to have better understanding of the atomic and electronic structures, vibrational dynamics and thermodynamics of metallic surfaces and bi-metallic nanoparticles (NPs) via a multi-scale simulational approach. The research presented here involves the study of the physical and chemical properties of metallic surfaces and NPs that are useful to determine their functionality in building novel materials. The study follows the  bottom-up approach for which the knowledge gathered at the scale of atoms and NPs serves as a base to build, at the macroscopic scale, materials with desired physical and chemical properties. We use a variety of theoretical and computational tools with different degrees of accuracy to study problems in different time and length scales. Interactions between the atoms are derived using both Density Functional Theory (DFT) and Embedded Atom Method (EAM), depending on the scale of the problem at hand. For some cases, both methods are used for the purpose of comparison. For revealing the local contributions to the vibrational dynamics and thermodynamics for the systems possessing site-specific environments, a local approach in real-space is used, namely Real Space Green s Function method (RSGF). For simulating diffusion of atoms/clusters and growth on metal surfaces, Molecular Statics (MS) and Molecular Dynamics (MD) methods are employed.
Ph.D.
Department of Physics
Sciences
Physics PhD
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Meyer, Jörg, Anja Wadewitz, Lokamani, Cormac Toher, Roland Gresser, Karl Leo, Moritz Riede, Francesca Moresco et Gianaurelio Cuniberti. « Molecules for organic electronics studied one by one ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138788.

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The electronic and geometrical structure of single difluoro-bora-1,3,5,7-tetraphenyl-aza-dipyrromethene (aza-BODIPY) molecules adsorbed on the Au(111) surface is investigated by low temperature scanning tunneling microscopy and spectroscopy in conjunction with ab initio density functional theory simulations of the density of states and of the interaction with the substrate. Our DFT calculations indicate that the aza-BODIPY molecule forms a chemical bond with the Au(111) substrate, with distortion of the molecular geometry and significant charge transfer between the molecule and the substrate. Nevertheless, most likely due to the low corrugation of the Au(111) surface, diffusion of the molecule is observed for applied bias in excess of 1 V
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
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Doheny-Adams, Timothy. « Manipulating stomatal density affects plant growth, yield and drought tolerance ». Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4180/.

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Photosynthesis in leaves is dependent on CO2 reaching mesophyll cells which contain the bulk of chlorophyll, yet most of the leaf is enveloped by a waxy cuticle which is almost impermeable to CO2 and water. Gas exchange is enabled through pores on the leaf epidermis called stomata which are each formed by two specialised guard cells morphologically distinct from general epidermal cells and able to react to their environment by increasing or decreasing cell turgor. This enables the stomatal pores to open or close depending on the plant’s need to acquire CO2 or conserve water, allowing much needed flexibility in plant water relations. The experiments detailed in this thesis have the broad aim of determining correlations between altered stomatal density, stomatal size, leaf gas exchange, drought tolerance, and plant water use efficiency. Most experiments have been carried out on a set of Arabidopsis mutants with altered expression of Epidermal Patterning Factors (EPFs), a peptide family which is involved in the development of stomatal patterning and density on the leaf. Chapter 3 addresses the question of how altering the EPF family of peptides affects leaf morphology and more specifically whether stomatal densities correlate with stomatal size in Arabidopsis plants with altered EPF expression patterns. Chapter 4 examines the leaf gas exchange properties of Arabidopsis and questions whether or not altering stomatal density impacts leaf water use efficiency and photosynthesis. Finally, experiments in chapter 5 highlight how combined changes to leaf morphology and gas exchange due to altered EPF expression impact drought tolerance, seed yield and rosette morphology. Although most of this work was carried out on Arabidopsis plants, stomatal densities and water use efficiencies were also examined in a set of Barley cultivars to determine whether similar trends could be observed in a directly agriculturally useful plant. Results of these experiments and suggested directions to pursue this work in barley are summarised in chapter 6.
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Meyer, Jörg, Anja Wadewitz, Lokamani, Cormac Toher, Roland Gresser, Karl Leo, Moritz Riede, Francesca Moresco et Gianaurelio Cuniberti. « Molecules for organic electronics studied one by one ». Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27781.

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The electronic and geometrical structure of single difluoro-bora-1,3,5,7-tetraphenyl-aza-dipyrromethene (aza-BODIPY) molecules adsorbed on the Au(111) surface is investigated by low temperature scanning tunneling microscopy and spectroscopy in conjunction with ab initio density functional theory simulations of the density of states and of the interaction with the substrate. Our DFT calculations indicate that the aza-BODIPY molecule forms a chemical bond with the Au(111) substrate, with distortion of the molecular geometry and significant charge transfer between the molecule and the substrate. Nevertheless, most likely due to the low corrugation of the Au(111) surface, diffusion of the molecule is observed for applied bias in excess of 1 V.
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Mishra, Shantanu, Thorsten G. Lohr, Carlo A. Pignedoli, Junzhi Liu, Reinhard Berger, JoséI Urgel, Klaus Müllen, Xinliang Feng, Pascal Ruffieux et Roman Fasel. « Tailoring Bond Topologies in Open-Shell Graphene Nanostructures ». ACS Publications, 2018. https://tud.qucosa.de/id/qucosa%3A36585.

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Polycyclic aromatic hydrocarbons exhibit a rich spectrum of physicochemical properties depending on the size and, more critically, on the edge and bond topologies. Among them, open-shell systems - molecules hosting unpaired electron densities - represent an important class of materials for organic electronic, spintronic, and optoelectronic devices, but remain challenging to synthesize in solution. We report the on-surface synthesis and scanning tunneling microscopy- and spectroscopybased study of two ultralow-gap open-shell molecules, namely peri-tetracene, a benzenoid graphene fragment with zigzag edge topology, and dibenzo[a,m]dicyclohepta-[bcde,nopq]rubicene, a nonbenzenoid nonalternant structural isomer of peri-tetracene with two embedded azulene units. Our results provide an understanding of the ramifications of altered bond topologies at the single-molecule scale, with the prospect of designing functionalities in carbon-based nanostructures via engineering of bond topology.
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Livres sur le sujet "Density manipulation"

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McCrary, Justin. Manipulation of the running variable in the regression discontinuity design : A density test. Cambridge, MA : National Bureau of Economic Research, 2007.

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Morris, Mark Alan. Biological control of Tetranychus urticae (Koch) on peppermint by Neoseiulus fallacis (Garman) : Density relationships, overwintering, habitat manipulation and pesticide effects. 1998.

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Greffet, Jean-Jacques. Introduction to near-field optics and plasmonics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198768609.003.0002.

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A striking difference between near-field optics and far-field optics is the possibility of breaking the so-called diffraction limit, namely of confining light to subwavelength spots. The first section of this chapter introduces the concept of evanescent waves to discuss the subwavelength confinement of light. One of the key ideas put forward is that the presence of charges is required to generate highly localized fields. It is thus necessary to have a tool to compute fields in the presence of these charges. With this aim, the concept of the Green tensor is introduced in the second section. This is a powerful tool for computing electromagnetic fields in inhomogeneous environments. It is also a key quantity for discussing the local density of states and therefore controlling spontaneous emission. The final section is devoted to an introduction to surface plasmons, which are very useful for manipulating electromagnetic fields at the nanoscale.
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Chapitres de livres sur le sujet "Density manipulation"

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Zhao, Jiajun. « Realizing Acoustic Cloaking and Near-Zero Density with Acoustic Metastructure ». Dans Manipulation of Sound Properties by Acoustic Metasurface and Metastructure, 43–54. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2125-1_5.

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Abbas, Baqar, Ammar Belatreche et Ahmed Bouridane. « Stock Price Manipulation Detection Using Empirical Mode Decomposition Based Kernel Density Estimation Clustering Method ». Dans Advances in Intelligent Systems and Computing, 851–66. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01057-7_63.

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Rose, Colin, et Murray D. Smith. « Random[Title] : Manipulating Probability Density Functions ». Dans Computational Economics and Finance, 416–68. New York, NY : Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-2340-5_16.

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Singh, Balwant, Shefali Mishra, Deepak Singh Bisht et Rohit Joshi. « Growing Rice with Less Water : Improving Productivity by Decreasing Water Demand ». Dans Rice Improvement, 147–70. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66530-2_5.

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AbstractRice is a staple food for more than half of the global population. With the increasing population, the yield of rice must correspondingly increase to fulfill the requirement. Rice is cultivated worldwide in four different types of ecosystems, which are limited by the availability of irrigation water. However, water-limiting conditions negatively affect rice production; therefore, to enhance productivity under changing climatic conditions, improved cultivation practices and drought-tolerant cultivars/varieties are required. There are two basic approaches to cultivation: (1) plant based and (2) soil and irrigation based, which can be targeted for improving rice production. Crop plants primarily follow three mechanisms: drought escape, avoidance, and tolerance. Based on these mechanisms, different strategies are followed, which include cultivar selection based on yield stability under drought. Similarly, soil- and irrigation-based strategies consist of decreasing non-beneficial water depletions and water outflows, aerobic rice development, alternate wetting and drying, saturated soil culture, system of rice intensification, and sprinkler irrigation. Further strategies involve developing drought-tolerant cultivars through marker-assisted selection/pyramiding, genomic selection, QTL mapping, and other breeding and cultivation practices such as early planting to follow escape strategies and decreasing stand density to minimize competition with weeds. Similarly, the identification of drought-responsive genes and their manipulation will provide a technological solution to overcome drought stress. However, it was the Green Revolution that increased crop production. To maintain the balance, there is a need for another revolution to cope with the increasing demand.
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Moriarty, Philip. « Submolecular Resolution Imaging of $$\text{C}_{60}$$ C 60 : From Orbital Density to Bond Order ». Dans Imaging and Manipulating Molecular Orbitals, 195–206. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38809-5_14.

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Traveset, Anna, et David M. Richardson. « Plant invasions : the role of biotic interactions - an overview. » Dans Plant invasions : the role of biotic interactions, 1–25. Wallingford : CABI, 2020. http://dx.doi.org/10.1079/9781789242171.0001.

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Abstract Diverse biotic interactions between non-native plant species and other species from all taxonomic groups are crucial mediators of the dynamics of plant invasions. This chapter reviews the key hypotheses in invasion ecology that invoke biotic interactions to explain aspects of plant invasion dynamics. We examine the historical context of these hypotheses and assess the evidence for accepting or rejecting their predictions. Most hypotheses invoke antagonistic interactions, mainly competition, predation, herbivory interactions and the role of pathogens. Only in the last two decades have positive (facilitative/mutualistic) interactions been explicitly included in invasion biology theory (as in ecological theory in general). Much information has accumulated in testing hypotheses relating to biotic resistance and Enemy Release Theory, although many of the emerging generalizations are still contentious. There is growing consensus that other drivers of plant invasion success, such as propagule pressure and disturbance, mediate the outcome of biotic interactions, thereby complicating our ability to make predictions, but these have rarely been assessed in both native and adventive ranges of non-native invasive species. It is also widely acknowledged that biogeographic comparisons, more than common garden experiments, are needed to shed light on many of the contradictory results. Contrasting findings have also emerged in exploring the roles of positive interactions. Despite strong evidence that such interactions are crucial in many communities, more work is needed to elucidate the factors that influence the relative importance of positive and negative interactions in different ecosystems. Different types of evidence in support of invasional meltdown have emerged for diverse habitats and across spatial scales. In light of increasing evidence that biotic indirect effects are crucial determinants of the structure, dynamics and evolution of ecological communities, both direct and indirect interactions involving native and non-native species must be considered to determine how they shape plant invasion patterns and the ecological impacts of non-native species on recipient communities. Research that examines both biotic interactions and the factors that mediate their strength and alter interaction outcomes is needed to improve our ability to predict the effects of novel interactions between native and non-native species, and to envisage how existing invaded communities will respond to changing environmental conditions. Many opportunities exist for manipulating biotic interactions as part of integrated control strategies to reduce the extent, density and impacts of non-native plant invasions. These include the introduction of species from the native range of the non-native plant for biological control, diverse manipulations of plant - herbivore interactions and many types of interaction to enhance biotic resistance and steer vegetation recovery following non-native plant control.
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Harrison, Susan, et Naomi Cappuccino. « Using Density-Manipulation Experiments to Study Population Regulation ». Dans Population Dynamics, 131–47. Elsevier, 1995. http://dx.doi.org/10.1016/b978-012159270-7/50008-7.

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« Percid Pond Production Techniques : Timing, Enrichment, and Stocking Density Manipulation ». Dans Strategies and Tactics for Management of Fertilized Hatchery Ponds, 21–44. CRC Press, 2018. http://dx.doi.org/10.1201/9781315273013-8.

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Adamson, Peter. « Matter ». Dans Al-Rāzī, 71–98. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197555033.003.0004.

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This chapter takes a look at Razi’s atomic theory of matter: why it must be posited as an eternal principle alongside God and soul, and how bodies are made up of atoms. It is shown that Razi had a fairly detailed theory as to how atomic density explains the property of elemental bodies, as well as several arguments for the reality of void. The resulting theory is more comparable to that of the ancient atomists than to the atomism of contemporary Islamic theologians. A final section attempts to understand Razi’s writings on alchemy in the light of this atomistic physics, and suggests that alchemical transformations may be explained on his view in terms of the manipulation of atoms.
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Erener, Arzu, Gulcan Sarp et Sebnem H. Duzgun. « Use of GIS and Remote Sensing for Landslide Susceptibility Mapping ». Dans Encyclopedia of Information Science and Technology, Fourth Edition, 3503–14. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2255-3.ch304.

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In recent years, geographical information systems (GISs) and Remote Sensing (RS) have proven to be common tools adopted for different studies in different scientific disciplines. GIS defined as a set of tools for the input, storage, retrieval, manipulation, management, modeling, analysis and output of spatial data. RS, on the other hand, can play a role in the production of a data and in the generation of thematic maps related to spatial studies. This study focuses on use of GIS and RS data for landslide susceptibility mapping. Five factors including Normalized Difference Vegetation Index (NDVI) and Topographic Wetness Index (TWI), slope; lineament density and distance to roads were used for the grid based approach for landslide susceptibility mappings. Results of this study suggest that geographic information systems can effectively be used to obtain susceptibility maps by compiling and overlaying several data layers relevant to landslide hazards.
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Actes de conférences sur le sujet "Density manipulation"

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Brinton, Chris. « Dynamic density management via minimal trajectory manipulation ». Dans 2009 IEEE/AIAA 28th Digital Avionics Systems Conference (DASC). IEEE, 2009. http://dx.doi.org/10.1109/dasc.2009.5347534.

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Imura, Ryo, Hajime Koyanagi, M. Miyamoto, Toshimichi Shintani, Kimio Nakamura, Atsushi Kikukawa et Sumio Hosaka. « Ultrahigh density data storage by atomic manipulation ». Dans Optical Data Storage '94, sous la direction de David K. Campbell, Martin Chen et Koichi Ogawa. SPIE, 1994. http://dx.doi.org/10.1117/12.190165.

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Bhadage, Rushikesh, Tejas Dhakad, Shubham Joshi, Prajakta Lasanpure et Nilesh Bhandare. « Smart Traffic Dynamic Manipulation System Using Vehicle Density ». Dans 2020 5th International Conference on Communication and Electronics Systems (ICCES). IEEE, 2020. http://dx.doi.org/10.1109/icces48766.2020.9137865.

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Yamamoto, Yasuyuki, Shiho Tokonami et Takuya Iida. « High-density assembly of micro-dispersoids by laser-induced bubble and fluid flow ». Dans Optical Manipulation and Structured Materials Conference, sous la direction de Takashige Omatsu. SPIE, 2018. http://dx.doi.org/10.1117/12.2319385.

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Senova, Yann Suhan, Ilona Scisniak, Chih Chieh Chiang, Isabelle Doignon, Claire Martin, Stephane Palfi, Antoine Chaillet et Frederic Pain. « Experimental assessment of thermal effects of high power density light stimulation for optogenetics control of deep brain structures (Conference Presentation) ». Dans Optogenetics and Optical Manipulation, sous la direction de Samarendra K. Mohanty et Nitish V. Thakor. SPIE, 2016. http://dx.doi.org/10.1117/12.2210944.

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Shi, Xun, Wenjing You, Yingchao Zhang, Zhensheng Tao, Yigui Zhong, Peter M. Oppeneer, Xianxin Wu et al. « Light-induced manipulation of the charge density wave in 1T-TaSe2 ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : OSA, 2020. http://dx.doi.org/10.1364/up.2020.tu3b.4.

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Massey, Travis L., Joong Hwa Lee, Mitas Ray, Nikhil S. Sathe, Xing Liu, Kristofer S. J. Pister et Michel M. Maharbiz. « Open-source automated system for assembling a high-density microwire neural recording array ». Dans 2016 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS). IEEE, 2016. http://dx.doi.org/10.1109/marss.2016.7561750.

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Kuang, Yingyi, Abraham Itzhak Weinberg, George Vogiatzis et Diego R. Faria. « Goal Density-based Hindsight Experience Prioritization for Multi-Goal Robot Manipulation Reinforcement Learning ». Dans 2020 29th IEEE International Conference on Robot and Human Interactive Communication (RO-MAN). IEEE, 2020. http://dx.doi.org/10.1109/ro-man47096.2020.9223473.

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Zigoneanu, Lucian, Bogdan-Ioan Popa et Steven A. Cummer. « Sound Manipulation With Acoustic Metamaterials ». Dans ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-1277.

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Acoustic metamaterials are engineered materials with properties hard or impossible to find in natural materials (e.g. negative effective density and/or negative bulk modulus). Therefore, a myriad of novel applications could be imagined and some of them have already been theoretically and/or experimentally demonstrated. Gradient index acoustic lenses, acoustic cloaks or acoustic absorbing panels are some common examples. Here, we review the coordinate transformation approach (transformation acoustics) which provides the material parameters needed to precisely control the acoustic wave propagation. Then, we use this technique to design an acoustic black hole and a 3D acoustic ground cloak. We use numerical simulations to explore the practical feasibility of the material parameters required by these applications and design non-resonant, highly sub-wavelength unit cells that will implement them in practice.
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Nie, Shi-bin, et Shu-jie Yuan. « The preparation of multi-wall carbon nanotubes by carbonizing low-density polyethylene composites ». Dans 2012 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO). IEEE, 2012. http://dx.doi.org/10.1109/3m-nano.2012.6473007.

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Rapports d'organisations sur le sujet "Density manipulation"

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McCrary, Justin. Manipulation of the Running Variable in the Regression Discontinuity Design : A Density Test. Cambridge, MA : National Bureau of Economic Research, janvier 2007. http://dx.doi.org/10.3386/t0334.

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