Готові списки джерел за темами / Homogeneous and heterogeneous sets

Добірка наукової літератури з теми "Homogeneous and heterogeneous sets"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Homogeneous and heterogeneous sets"

1

Ahmed, Sohail, Hang Xu, and Qiang Sun. "Stagnation Flow of a SWCNT Nanofluid towards a Plane Surface with Heterogeneous-Homogeneous Reactions." Mathematical Problems in Engineering 2020 (April 30, 2020): 1–12. http://dx.doi.org/10.1155/2020/3265143.

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Анотація:
The homogeneous-heterogeneous reaction in the boundary layer flow of a water-based nanofluid in the stagnation-point region of a plane surface is investigated. The type of small particles explored here is the single-walled carbon nanotubes. The homogeneous nanofluid model is employed for description of behaviours of nanofluids. Here, the homogeneous (bulk) reaction is isothermal cubic autocatalytic, while the heterogeneous (surface) reaction is single, isothermal, and first order. The steady state of this system is analysed in detail, with equal diffusion coefficients being considered for both reactants and autocatalysts. Multiple solutions of the reduced system are captured for some particular sets of physical parameters, which seem to be overlooked in all previous published works with regard to studies of homogeneous-heterogeneous reactions modeled by homogeneous nanofluid models. Besides, we discover the significant limitation of previous conclusion about that the solutions by homogeneous nanofluid flow models can be recovered from those by regular fluids.
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2

Gerger, Gernot, Helmut Leder, Stella J. Faerber, and Claus-Christian Carbon. "When the Others Matter." Swiss Journal of Psychology 70, no. 2 (January 2011): 75–83. http://dx.doi.org/10.1024/1421-0185/a000041.

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Although innovativeness is an important variable in product design, we know little about its appreciation. We studied how appreciation of innovativeness and its dynamics depends on the heterogeneity of the context in which it appears. We employed a test-retest design in which appreciation of car interior designs was tested before and after repeated evaluations. We tested heterogeneous stimulus sets (highly and lowly innovative designs together; Experiment 1) and homogeneous stimulus sets (highly or lowly innovative designs; Experiment 2). The known effect ( Carbon, Hutzler, & Minge, 2006 ; Carbon & Leder, 2005 ) of a selective increase in attractiveness ratings for highly innovative stimuli after repeated evaluations was only obtained for heterogeneous sets. In homogeneous sets, both highly and lowly innovative interiors were rated similarly and showed similar dynamics. Experiment 3 was a shorter version of Experiment 1, which ruled out differences in experimental design (more ratings and longer duration in Experiment 1) as the cause of the differences. High innovativeness was found to show a specific increase in attractiveness ratings only when innovativeness was made apparent by presenting stimuli in heterogeneous sets. Thus, awareness of variation in innovativeness as a relevant stimulus dimension is a key feature regarding its effect on appreciation.
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3

Belke, Eva, Antje S. Meyer, and Markus F. Damian. "Refractory effects in picture naming as assessed in a semantic blocking paradigm." Quarterly Journal of Experimental Psychology Section A 58, no. 4 (May 2005): 667–92. http://dx.doi.org/10.1080/02724980443000142.

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In the cyclic semantic blocking paradigm participants repeatedly name sets of objects with semantically related names ( homogeneous sets) or unrelated names ( heterogeneous sets). The naming latencies are typically longer in related than in unrelated sets. In Experiment 1 we replicated this semantic blocking effect and demonstrated that the effect only arose after all objects of a set had been shown and named once. In Experiment 2, the objects of a set were presented simultaneously (instead of on successive trials). Evidence for semantic blocking was found in the naming latencies and in the gaze durations for the objects, which were longer in homogeneous than in heterogeneous sets. For the gaze-to-speech lag between the offset of gaze on an object and the onset of the articulation of its name, a repetition priming effect was obtained but no blocking effect. Experiment 3 showed that the blocking effect for speech onset latencies generalized to new, previously unnamed lexical items. We propose that the blocking effect is due to refractory behaviour in the semantic system.
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4

Adzhiev, Valery, Elena Kartasheva, Tosiyasu Kunii, Alexander Pasko, and Benjamin Schmitt. "Hybrid Cellular-functional Modeling of Heterogeneous Objects." Journal of Computing and Information Science in Engineering 2, no. 4 (December 1, 2002): 312–22. http://dx.doi.org/10.1115/1.1559580.

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An approach to modeling heterogeneous objects as multidimensional point sets with multiple attributes (hypervolumes) is presented. Attributes given at each point represent object properties of arbitrary nature (material, physical, etc.). A proposed theoretical framework is based on a hybrid model of geometry and attributes combining a cellular representation and a functionally based constructive representation of dimensionally non-homogeneous entities. Hypervolume model components such as objects, operations and relations are introduced and outlined. We present examples of modeling a multi-layer geological structure with cavities and wells, time-dependent adaptive mesh generation, and conversion of a 3D implicit complex to the cellular representation.
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5

Haidari, Abedin, and Amir T. Payandeh Najafabadi. "CHARACTERIZATION ORDERING RESULTS FOR LARGEST ORDER STATISTICS FROM HETEROGENEOUS AND HOMOGENEOUS EXPONENTIATED GENERALIZED GAMMA VARIABLES." Probability in the Engineering and Informational Sciences 33, no. 3 (June 27, 2018): 460–70. http://dx.doi.org/10.1017/s0269964818000220.

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Анотація:
The main aim of this paper is to present two new results concerning the characterization of likelihood ratio and reversed hazard rate orders between largest order statistics from two sets of independent heterogeneous and homogeneous exponentiated generalized gamma distributed random variables. These characterization results complete and strengthen some previous ones in the literature.
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6

Mohammadi, Ali, and Mohammad Farhadian. "Genetic evaluation of growth traits in Iranian Kordi Sheep using random regression model with homogeneous and heterogeneous residual variances." Genetika 49, no. 2 (2017): 469–82. http://dx.doi.org/10.2298/gensr1702469m.

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The purpose of this study was estimation of genetic parameter using random regression model (RRM) with various error variance in Iranian Kordi sheep. The data (consisting of 7875 weight records from birth to 360 days of age) were collected during the period 2000 to 2013 from the rearing and breeding station of Kordi sheep in Shirvan, Iran. The independent variables were Legendre polynomials (LP) of age at weighing and orders of fit from 2 to 5 were considered. Analyses were carried out fitting sets of random regression coefficients due to direct additive genetic, direct and maternal permanent environmental effects, with heterogeneous and homogeneous error variances. To compare the model were used different criteria such as LogL, AIC, BIC and LRT. The best fitting RRM among homogeneous error variance was the model with a LP of fourth order for fixed effect, fourth order for direct additive genetic and fifth order for direct and maternal permanent environmental effects (model 4455). Among the models with heterogeneous error variances different, model 7 (Heterogeneous error variances of 72 various classes), was selected as the best model. The variances increased along the trajectory from 3.75 to 12.81, 4.43 to 30.28 and 1.49 to 8.49; 0.25 to 27.94, 0.03 to 12.32 and 0.15 to 22.66 for direct additive genetic, direct and maternal permanent environmental effect by homogeneous and heterogeneous error variances, respectively. The direct heritability ranged from 0.15 to 0.41 and 0.11 to 0.56 by homogeneous and heterogeneous error variances, respectively. Genetic correlation between adjacent test days was more than between distant test days. This research has demonstrated the possibility of application of RRM with heterogeneous error variance for genetic evaluation of Iranian Kordi Sheep.
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7

Brown, D. D., F. M. Collins, W. P. Duprex, M. D. Baron, T. Barrett, and B. K. Rima. "‘Rescue’ of mini-genomic constructs and viruses by combinations of morbillivirus N, P and L proteins." Journal of General Virology 86, no. 4 (April 1, 2005): 1077–81. http://dx.doi.org/10.1099/vir.0.80804-0.

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Chloramphenicol acetyltransferase (CAT)-expressing negative-sense mini-genomic constructs of measles virus (MV) and rinderpest virus (RPV) were rescued by standard technology with helper plasmids expressing the nucleocapsid (N), phospho- (P) and large (L) proteins of MV, canine distemper virus (CDV) or RPV in order to determine whether the proteins of different viruses can function together. Homogeneous sets consisting of N, P and L plasmids derived from one virus were able to generate reporter gene expression from either mini-genomic construct. Heterogeneous sets of proteins from different viruses were not functional, with the exception that a low level of activity was obtained when MV N and P protein were combined with RPV L protein in the rescue of the MV mini-genomic construct, or CDV N was combined with RPV P and L in the rescue of the RPV mini-genome. However, only homogeneous sets of plasmids were able to rescue infectious virus from full-length anti-genome-expressing plasmids.
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8

Maxim, Anca, and Constantin-Florin Caruntu. "Coalitional Distributed Model Predictive Control Strategy for Vehicle Platooning Applications." Sensors 22, no. 3 (January 27, 2022): 997. http://dx.doi.org/10.3390/s22030997.

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This work aims at developing and testing a novel Coalitional Distributed Model Predictive Control (C-DMPC) strategy suitable for vehicle platooning applications. The stability of the algorithm is ensured via the terminal constraint region formulation, with robust positively invariant sets. To ensure a greater flexibility, in the initialization part of the method, an invariant table set is created containing several invariant sets computed for different constraints values. The algorithm was tested in simulation, using both homogeneous and heterogeneous initial conditions for a platoon with four homogeneous vehicles, using a predecessor-following, uni-directionally communication topology. The simulation results show that the coalitions between vehicles are formed in the beginning of the experiment, when the local feasibility of each vehicle is lost. These findings successfully prove the usefulness of the proposed coalitional DMPC method in a vehicle platooning application, and illustrate the robustness of the algorithm, when tested in different initial conditions.
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9

Farooq, Umer, Husain Parvez, Habib Mehrez, and Zied Marrakchi. "Exploration of Heterogeneous FPGA Architectures." International Journal of Reconfigurable Computing 2011 (2011): 1–18. http://dx.doi.org/10.1155/2011/121404.

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Анотація:
Mesh-based heterogeneous FPGAs are commonly used in industry and academia due to their area, speed, and power benefits over their homogeneous counterparts. These FPGAs contain a mixture of logic blocks and hard blocks where hard blocks are arranged in fixed columns as they offer an easy and compact layout. However, the placement of hard-blocks in fixed columns can potentially lead to underutilization of logic and routing resources and this problem is further aggravated with increase in the types of hard-blocks. This work explores and compares different floor-planning techniques of mesh-based FPGA to determine their effect on the area, performance, and power of the architecture. A tree-based architecture is also presented; unlike mesh-based architecture, the floor-planning of heterogeneous tree-based architecture does not affect its routing requirements due to its hierarchical structure. Both mesh and tree-based architectures are evaluated for three sets of benchmark circuits. Experimental results show that a more flexible floor-planning in mesh-based FPGA gives better results as compared to the column-based floor-planning. Also it is shown that compared to different floor-plannings of mesh-based FPGA, tree-based architecture gives better area, performance, and power results.
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10

Kraus, Alexander E., Evgeny I. Kraus, and Ivan I. Shabalin. "Simulation of a Group Impact on a Heterogeneous Target of Finite Thickness." Journal of Siberian Federal University. Mathematics & Physics 14, no. 6 (December 2021): 700–711. http://dx.doi.org/10.17516/1997-1397-2021-14-6-700-711.

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Numerical simulation of the processes of high-speed loading of homogeneous and heteroge- neous targets by single projectiles, as well as by a group of projectiles with the same parameters in mass and momentum, has been carried out. Based on a comparison of the numerical simulation results for loading targets with different sets of projectiles, it is found that a projectile in the form of a ring knocks out the maximum hole in the target in terms of geometric dimensions, while a set of seven small disks removes the maximum mass from the target. The ring impact forms a continuous spall plate, which outruns the cloud of fragments of the destroyed material. Adding more than 5% of ceramics to the aluminum target volume does not allow the projectiles to penetrate through
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Більше джерел

Дисертації з теми "Homogeneous and heterogeneous sets"

1

Yang, Dan-Hui. "Homogeneous and heterogeneous sonochemistry." Doctoral thesis, Universite Libre de Bruxelles, 1992. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212940.

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2

Yolov, Nikola. "Homogeneous sets in graphs and hypergraphs." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:23a05b21-773b-4bf9-8776-1bd4b10c3c34.

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A set of vertices in a graph or a hypergraph is called homogeneous if it is independent, that is it does not contain any edge, or if it is complete, that is it contains all possible pairs or subsets of it as edges. We investigate the properties of graphs and hypergraphs in two cases of imposed restrictions on the structure of their homogeneous sets. First we study the asymptotic structure of random perfect graphs. We give a generation model which yields such graphs almost uniformly, with an additive error of e-Ω(n) in the total variation distance. We use this model to determine a number of properties of random perfect graphs, including the distribution of the stability and the clique number, the probability of containing a fixed induced subgraph, Hamiltonicity, clique-colourability, connectivity, edge colouring, and the limit of a uniformly drawn sequence of perfect graphs. In the second part, we give a hypergraph parameter μ(H), called minor- matching number, with the property that hypergraphs H with bounded rank and minor-matching number contain a polynomially-bounded number of maximal independent sets. In the other direction, every hypergraph H contains at least 2μ(H) maximal independent sets. A number of hard hypergraph problems, including maximum-sized independent set, k-colouring and hypergraph homomorphism can be solved in polynomial time if a list with all maximal independent sets of the hypergraph is given as part of the input, and hence a family of instances with bounded minor-matching number of the input hypergraph form a new polynomial class for the problems above. The class can further be generalised by considering the maximum minor matching number of a bag in a tree decomposition as a new treewidth measure. We explain how to use this measure, defined as minor-matching treewidth, to solve hard problems and how to algorithmically construct a tree decomposition with approximate minimal width.
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3

Shaikh, Muhammad. "Homogeneous to heterogeneous Face Recognition." Thesis, Northumbria University, 2015. http://nrl.northumbria.ac.uk/32283/.

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Face Recognition, a very challenging research area, is being studied for almost more than a decade to solve variety of problems associated with it e.g. PIE (pose, expression and illumination), occlusion, gesture, aging etc. Most of the time, these problems are considered in situations when images are captured from same sensors/cameras/modalities. The methods in this domain are termed as homogeneous face recognition. In reality face images are being captured from alternate modalities also e.g. near infrared (NIR), thermal, sketch, digital (high resolution), web-cam (low resolution) which further alleviates face recognition problem. So, matching faces from different modalities are categorized as heterogeneous face recognition (HFR). This dissertation has major contributions in heterogeneous face recognition as well as its homogeneous counterpart. The first contribution is related to multi-scale LBP, Sequential forward search and KCRC-RLS method. Multi scale approaches results in high dimensional feature vectors that increases computational cost of the proposed approach and overtraining problem. Sequential forward approach is adopted to analyze the effect of multi-scale. This study brings an interesting facts about the merging of features of individual scale that it results in significant reduction of the variance of recognition rates among individual scales. In second contribution, I extend the efficacy of PLDA to heterogeneous face recognition. Due to its probabilistic nature, information from different modalities can easily be combined and priors can be applied over the possible matching. To the best of author’s knowledge, this is first study that aims to apply PLDA for intermodality face recognition. The third contribution is about solving small sample size problem in HFR scenarios by using intensity based features. Bagging based TFA method is proposed to exhaustively test face databases in cross validation environment with leave one out strategy to report fair and comparable results. The fourth contribution is about the module which can identify the modality types is missing in face recognition pipeline. The identification of the modalities in heterogeneous face recognition is required to assist automation in HFR methods. The fifth contribution is an extension of PLDA used in my second contribuiton. Bagging based probabilistic linear discriminant analysis is proposed to tackle problem of biased results as it uses overlapping train and test sets. Histogram of gradient descriptors (HOG) are applied and recognition rates using this method outperform all the state-of-the-art methods with only HOG features.
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4

Bosquain, Sylvain S. "Homogeneous and heterogeneous oxidations of alkylbenzenes." Thesis, University of York, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288594.

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5

Bloomberg, Deborah M. "Pedophilia a heterogeneous or homogeneous phenomenon?" Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/4562.

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6

Roberts, Virginia Marie. "Homogeneous and heterogeneous catalyzed hydrolysis of lignin." kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/652904/652904.pdf.

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7

Snider, Graydon. "Homogeneous and heterogeneous oxidation of gaseous elemental mercury." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107726.

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Анотація:
Mercury is an atmospheric global pollutant with complex cycling behavior. Two-thirds of the mercury present in our atmosphere is anthropogenic in origin. Chemical oxidation of gaseous elemental mercury governs the deposition rate of mercury over most lakes, land, and oceans. A major uncertainty comes from the effect of atmospheric surfaces such as aerosols. Much research is devoted to mercury capture technologies to be used in coal fire power plants, which are the major source of anthropogenic emissions.This thesis is a report on oxidation kinetics and mechanistic studies relevant to mercury-scavenging reactions. It provides an overview of the mechanisms of mercury oxidation by ozone, nitrogen dioxide, and titanium dioxide (exposed to ultra-violet light). The role of surfaces was quantified, as appropriate for each system. Crossover effects between gaseous co-pollutants (e.g. CO, SO2) and surfaces (SiO2, TiO2) are discussed. Rate constants were measured for each process and product studies were performed and compared with the available literature. The effects of different surfaces and gases on the oxidation of mercury by ozone were measured. This reaction was confirmed to be a surface-enhanced gas phase initiated reaction with a second-order rate constant for pure gas-phase (kgas = (5.40 +/- 0.56) x 10-19 cm3 molec-1 s-1) and an enhanced surface component (ksur = (2.91 +/- 0.12) x 10-15 cm7 molec-1 s-1), or knet = (6.1 +/- 1.1) x 10-19 cm3 molec-1 s-1. Water vapor had no effect on the rate but liquid water and gaseous carbon monoxide both rapidly accelerated the reaction. Mechanisms were placed in context with atmospheric oxidative scavenging processes. Future work may combine aerosols (soot, acid, silica) in ozone oxidation reactions and/or addition of SO2 gas. The feasibility of removing mercury from a coal flue gas via titanium dioxide and ultra violet light was investigated. Discussed are some of the possible surface chemistry models of oxidation. The uptake rates of mercury over photosensitized titanium dioxide films was described by the Langmuir-Hinshelwood rate equation, where KHg = (5.1 +/- 2.4) x 10-14 cm3 molec-1 and k = (7.4 +/- 2.5) x 1014 molec cm-2 min-1. Effects of sulfur dioxide and water were evaluated but neither was found to impede the reaction. By contrast low oxygen level strongly impeded oxidation rates. Deposits of HgO on titania surfaces were widely dispersed in concentrated clusters. Currently there is no explanation to this pattern. Future experiments may use light emitting diodes to capture Hg0(g) over TiO2The oxidation of mercury by nitrogen dioxide was found to be a pure gas phase reaction, second order with respect to NO2, where k = (3.5 +/- 0.5) x 10-35 cm6 molec-2 s-1. The mechanism was conjectured to be a two-step addition of NO2 to Hg0; at higher NO2 concentrations the reaction may be first order with respect to NO2 but further experiments would be required for validation. The rate constant was also found in agreement with a previous study. Rates were unaffected by changes in pressure, available surfaces, presence of SO2, and water. It was discovered that TiO2 surfaces saturated in HgO deposits, when exposed to NO2 were 'revived' in Hg uptake activity. It is suspected the reaction between HgO and NO2 re-disperses the deposits.
Le mercure est un polluant atmosphérique globale avec le comportement les cyclismes complexes. Deux tiers du mercure présent dans notre atmosphère est d'origine anthropique. L'oxydation chimique de mercure élémentaire gazeux régit la vitesse des dépôts de mercure sur la plupart des lacs, des terres et des océans. Une incertitude majeure provient de l'effet des surfaces atmosphériques tels que les aérosols. Beaucoup de recherches sont consacrées aux technologies de captage du mercure pour être utilisés dans les centrales au charbon de puissance de feu, qui sont la principale source d'émissions anthropiques.Cette thèse est un rapport sur la cinétique d'oxydation et d'études mécanistiques relatives au mercure-balayage réactions. Il donne un aperçu des mécanismes d'oxydation du mercure par l'ozone, le dioxyde d'azote et dioxyde de titane (exposé à la lumière ultraviolette). Le rôle des surfaces ont été quantifiés, comme il convient pour chaque système. Effets de coupure entre gazeux co-polluants (par exemple CO, SO2) et les surfaces (SiO2, TiO2) sont discutées. Les constantes de vitesse ont été mesurées pour chaque processus et études de produits ont été effectués et comparés avec la littérature disponible.Les effets de différentes surfaces et de gaz sur l'oxydation du mercure par l'ozone ont été mesurés. Cette réaction a été confirmé à une phase gazeuse augmenter a la surface réaction initiée avec un taux de second ordre constant de pures en phase gazeuse (kgaz = (5,40 +/- 0,56) x 10-19 cm3 moléc-1 s-1) et une surface améliorée composant (ksur = (2,91 +/- 0,12) x 10-15 cm7 moléc-1 s-1), ou knet = (6,1 +/- 1,1) x 10-19 cm3 molec-1 s-1. La vapeur d'eau n'a eu aucun effet sur la vitesse, mais l'eau liquide et de monoxyde de carbone gazeux, à la fois rapidement accéléré la réaction. Des mécanismes ont été mis en contexte avec l'atmosphère oxydant processus de balayage. Les travaux futurs peuvent combiner les aérosols (suie, de l'acide, de la silice) dans les réactions d'oxydation de l'ozone et / ou ajout de SO2.La faisabilité de l'élimination du mercure des gaz de combustion de charbon par du dioxyde de titane et de lumière ultra-violette a été étudiée. Discuté sont quelques-uns des modèles possibles chimie de surface de l'oxydation. La vitesse d'absorption de mercure au cours photosensibilisées films de dioxyde de titane a été décrit par l'équation du taux de Langmuir-Hinshelwood, où KHg = (5,1 +/- 2,4) x 10-14 cm3 moléc-1 et k = (7,4 +/- 2,5) x 1014 cm-2 moléc-1 min-1. Effets du dioxyde de soufre et de l'eau ont été évalués, mais ni a été trouvée pour empêcher la réaction. Par niveau d'oxygène à faible contraste fortement entravé les taux d'oxydation. Dépôts sur des surfaces de HgO oxyde de titane ont été largement dispersés dans les amas concentré. Actuellement, il n'existe pas d'explication à ce modèle. Les expériences futures peuvent utiliser des diodes électroluminescentes à saisir Hg0 (g) sur TiO2. L'oxydation du mercure par le dioxyde d'azote a été trouvé à une réaction gaz pur phase du second ordre par rapport au NO2, où k = (3,5 +/- 0,5) x 10-35 cm6 molec-2 s-1. Le mécanisme a été conjecturé être un ajout en deux étapes de NO2 à Hg0(g); à des concentrations élevées de NO2 la réaction peut être de premier ordre à l'égard de NO2, mais d'autres expériences seraient nécessaires pour la validation. La constante de vitesse a également été trouvé en accord avec une étude précédente. Les vitesses ont été affectées par les changements de pression, les surfaces disponibles, la présence de SO2, et l'eau. On a découvert que le TiO2 surfaces saturées dans les dépôts HgO(s), lorsqu'ils sont exposés à de NO2 ont été 'relancé' dans l'activité d'absorption de mercure. Il est soupçonné de la réaction entre HgO(s) et NO2 disperse les dépôts.
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8

Guo, Chris. "Alkane Oxidation Catalysis by Homogeneous and Heterogeneous Catalyst." University of Sydney. Chemistry, 2005. http://hdl.handle.net/2123/622.

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Abstract Cobalt-based complexes are widely used in industry and organic synthesis as catalysts for the oxidation of hydrocarbons. The Co/Mn/Br (known as "CAB system") catalyst system is effective for the oxidation of toluene. The Co/Mn/Br/Zr catalyst system is powerful for the oxidation of p-xylene, but not for the oxidation of toluene. [Co3O(OAc)5(OH)(py)3][PF6] (Co 3+ trimer 5) is more effective than [Co3O(OAc)6(py)3][PF6] (Co 3+ trimer 6) as a catalyst in the CAB catalyst system. Higher temperatures favour the oxidation of toluene. Zr 4+ does not enhance the oxidation of toluene. Zr 4+ could inhibit the oxidation of toluene in the combination of Co/Br/Zr, Co/Mn/Zr or Co/Zr. NHPI enhances the formation of benzyl alcohol, but the formation of other by-products is a problem for industrial processes. Complex(es) between cobalt, manganese and zirconium might be formed during the catalytic reaction. However, attempts at the preparation of complexes consisting of Co/Zr or Mn/Zr or Co3ZrP or Co8Zr4 clusters failed. The oxidation of cyclohexane to cyclohexanone and cyclohexanol is of great industrial significance. For the homogeneous catalysis at 50 o C and 3 bar N2 pressure, the activity order is: Mn(OAc)3 �2H2O > Mn12O12 cluster > Co 3+ trimer 6 > [Co3O(OAc)3(OH)2(py)5][PF6]2 (Co 3+ trimer 3) > Co 3+ trimer 5 > Co(OAc)2 �4H2O > [Co2(OAc)3(OH)2(py)4][PF6]-asym (Co dimerasym) > [Co2(OAc)3(OH)2(py)4][PF6]-sym (Co dimersym); whereas [Mn2CoO(OAc)6(py)3]�HOAc (Mn2Co complex) and zirconium(IV) acetate hydroxide showed almost no activity under these conditions. But at 120 o C and 3 bar N2 pressure, the activity order is changed to: Co dimerasym > Co(OAc)2 �4H2O > Co trimer 3 and Mn(OAc)3 �2H2O > Co 3+ trimer 6 > Mn2Co complex > Co 3+ trimer 5 > Co dimersym > Mn12O12 cluster. The molar ratio of the products was close to cyclohexanol/cyclohexanone=2/1. Mn(II) acetate and zirconium(IV) acetate hydroxide showed almost no activity under these conditions. Among those cobalt dimers and trimers, only the cobalt dimerasym survived after the stability tests, this means that [Co2(OAc)3(OH)2(py)4][PF6]-asym might be the active form for cobalt(II) acetate in the CAB system. Metal-substituted (silico)aluminophosphate-5 molecular sieves (MeAPO-5 and MeSAPO-5) are important heterogeneous catalysts for the oxidation of cyclohexane. The preparation of MeAPO-5 and MeSAPO-5 and their catalytic activities were studied. Pure MeAPO-5 and MeSAPO-5 are obtained and characterised. Four new pairs of bimetal-substituted MeAPO-5 and MeSAPO-5(CoZr, MnZr, CrZr and MnCo) were prepared successfully. Two novel trimetal-subtituted MeAPO-5 and MeSAPO-5 (MnCoZr) are reported here. Improved methods for the preparation of four monometal-substituted MeAPO-5 (Cr, Co, Mn and Zr) and for CoCe(S)APO-5 and CrCe(S)APO-5 are reported. Novel combinational mixing conditions for the formation of gel mixtures for Me(S)APO-5 syntheses have been developed. For the oxidation of cyclohexane by TBHP catalysed by MeAPO-5 and MeSAPO-5 materials, CrZrSAPO-5 is the only active MeSAPO-5 catalyst among those materials tested under conditions of refluxing in cyclohexane. Of the MeAPO-5 materials tested, whereas CrCeSAPO-5 has very little activity, CrZrAPO-5 and CrCeAPO-5 are very active catalysts under conditions of refluxing in cyclohexane. MnCoAPO-5, MnZrAPO-5 and CrAPO-5 are also active. When Cr is in the catalyst system, the product distribution is always cyclohexanone/cyclohexanol equals 2-3)/1, compared with 1/2 for other catalysts. For MeAPO-5, the activity at 150 o C and 10 bar N2 pressure is: CrZrAPO-5 > CrCeAPO-5 > CoZrAPO-5. For MeAPO-5 and MeSAPO-5, at 150 o C and 13 bar N2 pressure, the selectivity towards cyclohexanone is: CrZrAPO-5 > CrZrSAPO-5 > CrCeAPO-5 > CrAPO-5 > MnCoAPO-5 > MnZrAPO-5; and the selectivity towards cyclohexanol is: MnZrAPO-5 > CrZrAPO-5 > MnCoAPO-5 > CrZrSAPO-5 > CrCeAPO-5 > CrAPO-5. Overall the selectivity towards the oxidation of cyclohexane is: CrZrAPO-5 > CrZrSAPO-5 > CrCeAPO-5 > CrAPO-5 > MnCoAPO-5 > MnZrAPO-5. The amount of water in the system can affect the performance of CrCeAPO-5, but has almost no effect on CrZrAPO-5. Metal leaching is another concern in potential industrial applications of MeAPO-5 and MeSAPO-5 catalysts. The heterogeneous catalysts prepared in the present work showed very little metal leaching. This feature, coupled with the good selectivities and effectivities, makes them potentially very useful.
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9

Hales, Jason Alexander. "COMPARING THE PERFORMANCE OF HETEROGENEOUS AND HOMOGENEOUS SWARMS." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11082007-132337/.

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This thesis compares the performance of heterogeneous and homogenous swarms. Swarms are defined as particles or agents which react to their environment and fellow particles or agents according to social rules. The weights of three attributes of an individual agent were varied for these experiments: Collision Avoidance with individual agents in the swarm, Center of Mass of the swarm and the parameter that controls Velocity Matching in the swarm. In homogenous swarms, all individuals had the same attribute weights while in heterogeneous swarms weights for one attribute were taken from a normal distribution for the population. These swarms were then given goals on a map to pursue. The maps were two-dimensional grid-surfaces with terrains of open, mountain and swamps. Performance was defined as the number of steps it took for 90% of the swarm to reach its final goal. The results show that heterogeneous swarms outperformed homogenous swarms if the weights for the Center of Mass Weight attribute were heterogeneous in the population. The Collision Avoidance and Matched Velocity attributes showed little performance difference for heterogeneous and homogenous swarms for the parameter weights tested. However, swarms heterogeneous in the Matched Velocity parameter showed substantial performance improvements for the most difficult map.
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10

Souza, Jeckson Dellagostin. "A reconfigurable heterogeneous multicore system with homogeneous ISA." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/140321.

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Dada a grande diversidade de aplicações embarcadas presentes nos atuais dispositivos portáveis, ambos os paralelismos em nível de threads e de instruções devem ser explorados para obter ganhos de desempenho e energia. Enquanto MPSoCs (sistemas em chip de múltiplos núcleos) são amplamente usados para esse propósito, estes falham quando consideramos produtividade de software, já que eles são compostos de chips com diferentes arquiteturas que precisam ser programados separadamente. Por outro lado, processadores multi núcleos de propósito geral implementam a mesma arquitetura, mas são compostos de núcleos homogêneos de processadores superescalares que consomem muita potência. Nesta dissertação, propõe-se um novo sistema, que tira proveito de circuitos reconfiguráveis para criar diferentes organizações que implementam a mesma arquitetura, capazes de apresentar alto desempenho com baixo custo energético. Para garantir a compatibilidade binária, usa-se um mecanismo de tradução binária que transforma o código a ser executado no circuito reconfigurável durante a execução. Usando aplicações representativas, mostra-se que uma versão do sistema heterogêneo pode ganhar da sua versão homogênea em média de 59% em desempenho e 10% em energia, com melhoras em EDP (Energy-Delay Product – Produto da energia pelo tempo de execução) em quase todos os cenários. Além disso, este trabalho também propõe e avalia seis escalonadores para este sistema heterogêneo: dois algoritmos estáticos, os quais alocam as threads no primeiro núcleo livre, onde elas permanecerão durante toda a execução; um escalonador direcionado por contagem de instruções, o qual realoca as threads durante pontos de sincronização de acordo com a sua contagem de instruções; um escalonador de Feedback, que usa dados de dentro da unidade reconfigurável para realocar threads; o PC-Feedback, que adiciona um mecanismo de reuso de dados ao último escalonador; e um escalonador Oráculo, que é capaz de decidir a melhor alocação de threads possível. Mostra-se que o algoritmo estático pode ter alto desempenho em aplicações com alto paralelismo, contudo para um desempenho mais uniforme em todas as aplicações os algoritmos de Feedback e PC-Feedback são mais indicados.
Given the large diversity of embedded applications one can find in current portable devices, for energy and performance reasons one must exploit both Thread- and Instruction Level Parallelism. While MPSoCs (Multiprocessor system-on-chip) are largely used for this purpose, they fail when one considers software productivity, since it comprises different ISAs (Instruction Set Architecture) that must be programmed separately. On the other hand, general purpose multicores implement the same ISA, but are composed of a homogeneous set of very power consuming superscalar processors. In this dissertation, we show how one can effectively use a reconfigurable unit to provide a number of different possible heterogeneous configurations while still sustaining the same ISA, capable of reaching high performance with low energy cost. To ensure ISA compatibility, we use a binary translation mechanism that transforms code to be executed on the fabric at run-time. Using representative benchmarks, we show that one version of the heterogeneous system can outperform its homogenous counterpart in average by 59% in performance and 10% in energy, with EDP (Energy-Delay Product) improvements in almost every scenario. Furthermore, this work also proposes and evaluates six schedulers for the heterogeneous system: two static algorithms, which allocate the threads on the first free core, where they will run during the entire execution; an Instruction Count (IC) Driven scheduler, which reallocates threads during synchronization points accordingly to their instruction count; a Feedback scheduler, which uses data from inside the reconfigurable unit to reallocate threads; the PCFeedback scheduler, that adds a reuse mechanism to the last one; and an Oracle scheduler, which is capable of deciding the best thread allocation possible. We show that the static algorithm can reach high performance in applications with high parallelism, however for uniform performance in all applications, the Feedback and PC-Feedback algorithms are better designated.
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Книги з теми "Homogeneous and heterogeneous sets"

1

1944-, Pelizzetti Ezio, Serpone Nick 1939-, and North Atlantic Treaty Organization. Scientific Affairs Division., eds. Homogeneous and heterogeneous photocatalysis. Dordrecht, Holland: D. Reidel Pub. Co., 1986.

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2

Pelizzetti, Ezio, and Nick Serpone, eds. Homogeneous and Heterogeneous Photocatalysis. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2.

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3

Can, Li, and Liu Yan, eds. Bridging Heterogeneous and Homogeneous Catalysis. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527675906.

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4

Bloomberg, Deborah M. Pedophilia: A heterogeneous or homogeneous phenomenon ? Ottawa: Bibliothèque nationale du Canada, 1986.

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5

Homogeneous zero-dimensional absolute Borel sets. [Amsterdam, the Netherlands]: Centrum voor Wiskunde en Informatica, 1986.

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6

service), ScienceDirect (Online, ed. Mechanisms in homogeneous and heterogeneous epoxidation catalysis. Amsterdam: Elsevier, 2008.

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7

Individual religious rights in schools: Heterogeneous systems, homogeneous results. Padova: CLEUP, 2012.

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8

Zecchina, Adriano, Silvia Bordiga, and Elena Groppo. Selective nanocatalysts and nanoscience: Concepts for heterogeneous and homogeneous catalysis. Weinheim: Wiley-VCH, 2011.

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9

Manders, Bart. Pulsed initiation polymerization: Applications of homogeneous and heterogeneous radical systems. Eindhoven: Eindhoven University, 1997.

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10

McAteer, Karl M. Homogeneous and heterogeneous reactions associated with polymer/enzyme composite electrodes. Dublin: University College Dublin, 1996.

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Частини книг з теми "Homogeneous and heterogeneous sets"

1

Ricciotti, Wilmer, and James Cheney. "Query Lifting." In Programming Languages and Systems, 579–606. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72019-3_21.

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AbstractLanguage-integrated query based on comprehension syntax is a powerful technique for safe database programming, and provides a basis for advanced techniques such as query shredding or query flattening that allow efficient programming with complex nested collections. However, the foundations of these techniques are lacking: although SQL, the most widely-used database query language, supports heterogeneous queries that mix set and multiset semantics, these important capabilities are not supported by known correctness results or implementations that assume homogeneous collections. In this paper we study language-integrated query for a heterogeneous query language $$\mathcal {NRC}_{\lambda }( Set,Bag )$$ NRC λ ( S e t , B a g ) that combines set and multiset constructs. We show how to normalize and translate queries to SQL, and develop a novel approach to querying heterogeneous nested collections, based on the insight that “local” query subexpressions that calculate nested subcollections can be “lifted” to the top level analogously to lambda-lifting for local function definitions.
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2

Bakhtchadjian, Robert. "Heterogeneous–Homogeneous and Homogeneous–Heterogeneous Processes in Atmospheric Chemistry." In Bimodal Oxidation: Coupling of Heterogeneous and Homogeneous Reactions, 225–48. Boca Raton : CRC Press, Taylor & Francis Group, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429295829-5.

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3

Job, Georg, and Regina Rüffler. "Homogeneous and Heterogeneous Mixtures." In Physical Chemistry from a Different Angle, 335–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15666-8_13.

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Hagiopol, Cornel. "Homogeneous and Heterogeneous Copolymerization." In Copolymerization, 181–206. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4183-7_5.

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5

Mekler, Alan H. "Homogeneous Partially Ordered Sets." In Finite and Infinite Combinatorics in Sets and Logic, 279–88. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2080-7_19.

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6

Brunner, Henri. "Homogeneous Enantioselective Catalysis." In Chiral Reactions in Heterogeneous Catalysis, 29–32. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1909-6_4.

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7

Balzani, Vincenzo, Alberto Juris, and Franco Scandola. "Photoinduced Charge Separation: Requirements Needed for Ideal Relays and Photosensitizers." In Homogeneous and Heterogeneous Photocatalysis, 1–27. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2_1.

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8

Franco, Cesar, and George McLendon. "Bifunctional Porphyrins: Redox Photochemistry of [Meso (Tritolyl (Pyridyl Ru(III) (NH3) 4 L’)) Porphyrin] (L’ = NH3, Pyridine, 5-Cl-Pyridine)." In Homogeneous and Heterogeneous Photocatalysis, 189–98. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2_10.

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9

Houlding, Virginia H., and Arthur J. Frank. "Linear Chain Platinum Complexes as Photocatalysts." In Homogeneous and Heterogeneous Photocatalysis, 199–211. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2_11.

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10

Mićić, O. I., M. T. Nenadović, T. Rajh, N. M. Dimitrijević, and A. J. Nozik. "Electron Transfer Reactions on Extremely Small Semiconductor Colloids Studied by Pulse Radiolysis." In Homogeneous and Heterogeneous Photocatalysis, 213–26. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2_12.

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Тези доповідей конференцій з теми "Homogeneous and heterogeneous sets"

1

Chen, Min, Yunfei Chen, Juekuan Yang, Yandong Gao, and Deyu Li. "Molecular Dynamics Simulation of Homogeneous and Heterogeneous Thermal Bubble Nucleation." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44324.

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Thermal bubble nucleation was studied using molecular dynamics for both homogeneous and heterogeneous systems using isothermal-isobaric (NPT) and isothermal-isostress (NPzzT) ensembles. Simulation results indicate that homogeneous thermal bubble nucleation is induced from cavities occurring spontaneously in the liquid when the temperature exceeds the superheat limit. In contrast to published results using NVE and NVT ensembles, no stable nanoscale bubble exists in NPT ensembles, but instead, the whole system changes into vapor phase. For a heterogeneous system composed of a nanochannel with an initial distance of 3.49 nm between the two solid plates, it is found that if the liquid-solid interaction is equal to or stronger than that between liquid argon atoms, the bubble nucleation temperature of the confined liquid argon can be higher than the corresponding homogeneous nucleation temperature, because of the more ordered arrangement of atoms within two solid walls nanometers apart. This observation is in contradiction to the common understanding that homogeneous bubble nucleation temperature sets an upper limit for thermal phase change under a given pressure. Compared to the system where the liquid-solid interaction is the same as that between liquid argon atoms, the system with reduced liquid-solid interaction possesses a significantly reduced bubble nucleation temperature, while the system with enhanced liquid-solid interaction only has a marginally increased bubble nucleation temperature.
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2

Edwards, Victoria, Paulo Rezeck, Luiz Chaimowicz, and M. Ani Hsieh. "Segregation of Heterogeneous Robotics Swarms via Convex Optimization." In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9653.

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The division of labor amongst a heterogeneous swarm of robots increases the range and sophistication of the tasks the swarm can accomplish. To efficiently execute a task the swarm of robots must have some starting organization. Over the past decade segregation of robotic swarms has grown as a field of research drawing inspiration from natural phenomena such as cellular segregation. A variety of different approaches have been undertaken to devise control methods to organize a heterogeneous swarm of robots. In this work, we present a convex optimization approach to segregate a heterogeneous swarm into a set of homogeneous collectives. We present theoretical results that show our approach is guaranteed to achieve complete segregation and validate our strategy in simulation and experiments.
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3

Owolabi, Gbadebo Moses, and Meera N. K. Singh. "A Comparison Between Two Models That Predict the Elastic-Plastic Behavior of Particulate Metal Matrix Composites Under Multiaxial Fatigue Type Loading." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42001.

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This paper is an effort to first modify two cyclic plasticity models developed for homogeneous metals to address the heterogeneous nature of particulate metal matrix composites (PMMCs), and subsequently to evaluate the resulting relations both theoretically and experimentally. Specifically, using the original Mro´z model and the endochronic theory of plasticity as their bases, two sets of elastic-plastic constitutive relations are identified. These sets of relations account for the interaction in stress fields between adjacent particles in PMMCs. The behavior predicted by each model is compared with experimental results obtained from a series of uniaxial and biaxial (tension-torsion) tests performed on circular specimens made of the 6061/Al2O3/20p-T6 PMMCs with 20% volume fraction of particles. The materials are tested for a variety of applied monotonic and cyclic loading paths.
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4

Travkin, V. S., and I. Catton. "Radiation Heat Transport in Porous Media." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1060.

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Abstract At present most work treats radiative transport in heterogeneous media as if it were a homogeneous medium, then relies on different methods to simulate the medium heterogeneity or uses similar governing equations with assigned distributions for coefficients. This approach is widely used although almost never found in other fields of heat and mass transport. The lack of generality in present theoretical treatments of radiative transport in heterogeneous media is addressed by rigorous development of a set of governing equations. The new rigorous equations for radiation transport in heterogeneous media are presented for the first time. As part of the development of the new set of equations for electromagnetic and spectral intensity fields, the diffusion approximation is explored.
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5

Gu, Wenting, Peng Cheng, and Zhili Hao. "Concurrent Spatial Mapping of the Elasticity of Heterogeneous Soft Materials via a Polymer-Based Microfluidic Device: A Preliminary Study." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63837.

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This paper presents a preliminary study on achieving concurrent spatial mapping of the spatially-varying elasticity of heterogeneous soft materials via a polymer-based microfluidic device. Comprised of a single compliant polymer rectangular microstructure and a set of electrolyte-enabled distributed resistive transducers, this device is capable of detecting continuous distributed loads. Through pressing a specimen against the device by a rigid probe with precisely-controlled displacements, the spatially-varying elasticity of a specimen is captured by continuous distributed loads acting on the device and is further registered as discrete resistance changes at the locations of the transducers in the device. Concurrent spatial mapping is conducted on homogeneous and heterogeneous specimens, and the related data analysis is performed on the measured results to extract their elasticity. The obtained results demonstrate the feasibility of concurrent spatial mapping of the spatially-varying elasticity of heterogeneous soft materials via this polymer-based microfluidic device.
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6

Mayo-Molina, Israel, and Juliana Y. Leung. "Design of Optimal Operational Parameters for Steam-Alternating-Solvent Processes in Heterogeneous Reservoirs - A Multi-Objective Optimization Approach." In SPE Europec featured at 82nd EAGE Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205120-ms.

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Abstract The Steam Alternating Solvent (SAS) process has been proposed and studied in recent years as a new auspicious alternative to the conventional thermal (steam-based) bitumen recovery process. The SAS process incorporates steam and solvent (e.g. propane) cycles injected alternatively using the same configuration as the Steam-Assisted Gravity-Drainage (SAGD) process. The SAS process offers many advantages, including lower capital and operational cost, as well as a reduction in water usage and lower Greenhouse Gas (GHG) Emissions. On the other hand, one of the main challenges of this relatively new process is the influence of uncertain reservoir heterogeneity distribution, such as shale barriers, on production behaviour. Many complex physical mechanisms, including heat transfer, fluid flows, and mass transfer, must be coupled. A proper design and selection of the operational parameters must consider several conflicting objectives. This work aims to develop a hybrid multi-objective optimization (MOO) framework for determining a set of Pareto-optimal SAS operational parameters under a variety of heterogeneity scenarios. First, a 2-D homogeneous reservoir model is constructed based on typical Cold lake reservoir properties in Alberta, Canada. The homogeneous model is used to establish a base scenario. Second, different shale barrier configurations with varying proportions, lengths, and locations are incorporated. Third, a detailed sensitivity analysis is performed to determine the most impactful parameters or decision variables. Based on the results of the sensitivity analysis, several objective functions are formulated (e.g., minimizing energy and solvent usage). Fourth, Response Surface Methodology (RSM) is applied to generate a set of proxy models to approximate the non-linear relationship between the decision variables and the objective functions and to reduce the overall computational time. Finally, three Multi-Objective Evolutionary Algorithms (MOEAs) are applied to search and compare the optimal sets of decision parameters. The study showed that the SAS process is sensitive to the shale barrier distribution, and that impact is strongly dependent on the location and length of a specific shale barrier. When a shale barrier is located near the injector well, pressure and temperature may build up in the near-well area, preventing additional steam and solvent be injected and, consequently, reducing the oil production. Operational constraints, such as bottom-hole pressure, steam trap criterion, and bottom-hole gas rate in the producer, are among various critical decision variables examined in this study. A key conclusion is that the optimal operating strategy should depend on the underlying heterogeneity. Although this notion has been alluded to in other previous steam- or solvent-based studies, this paper is the first to utilize a MOO framework for systematically determining a specific optimal strategy for each heterogeneity scenario. With the advancement of continuous downhole fibre-optic monitoring, the outcomes can potentially be integrated into other real-time reservoir characterization and optimization work-flows.
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7

Miettinen, Jaakko, Risto Sairanen, Stefan Holmstrom, and Ilona Lindholm. "Experimental Study and Analytical Methods for Particle Bed Dryout With Heterogeneous Particles and Pressure Variation." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22420.

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The interest to study the dryout heat flux in particle beds is related to interest of quantify the debris coolability margins during a hypothetical severe reactor accident. When the molten core has relocated to the containment floor, one accident management concept is based on the cooling of the corium by the water injection on top. Earlier experimental and analytical work has concentrated on homogeneous particle beds at atmospheric pressures. For plant safety assessment in Finland, there is a need to consider heterogeneous particle mixtures, layered particle bed setups and varied pressures. A facility has been constructed at VTT to measure dryout heat flux in a heterogeneous particle bed. The bed dimensions are 0.3 m in diameter and 0.6 m in height, with a mixture of 0.1 to 10 mm particles. The facility has a pressure range from atmospheric to 6 bar (overpressure). The bed is heated by spirals of a resistance band. The preliminary experiments have been carried out, but a more systematic set of data is expected to be available in the spring 2002. To support the experiments analytical models have been developed for qualification of the experimental results. The first comparison is done against various critical heat flux correlations developed in 1980’ies and 1990’ies for homogeneous bed conditions. The second comparison is done against 1-D and 0-D models developed by Lipinski. The most detailed analysis of the transient process conditions and dryout predictions are done by using the two-dimensional, drift-flux based thermohydraulic solution for the particle bed immersed into the water. The code is called PILEXP. Already the first validation results against the preliminary tests indicate that the transient process conditions and the mechanisms related to the dryout can be best explained and understood by using a multidimensional, transient code, where all details of the process control can be modeled as well. The heterogeneous bed and stratified bed can not be well considered by single critical heat flux correlations.
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Buryachenko, Valeriy A. "One Inclusion in the Infinite Peristatic Matrix." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86519.

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A basic problem of of micromechanics is analysis of one inclusion in the infinite matrix subjected to a homogeneous remote loading. A heterogeneous medium with the bond-based peri-dynamic properties (see Silling, J. Mech. Phys. Solids 2000; 48:175–209) of constituents is considered. At first a volumetric boundary conditions are set up at the external boundary of a final domain obtained from the original infinite domain by truncation. An alternative sort of truncation method is periodisation method when a unite cell (UC) size is increased while the inclusion size is fixed. In the second approach, the displacement field is decomposed as linear displacement corresponding to the homogeneous loading of the infinite homogeneous medium and a perturbation field introduced by one inclusion. This perturbation field is found by the Green function technique as well as by the iteration method for entirely infinite sample with an initial approximation given by a driving term which has a compact support. The methods are demonstrated by numerical examples for 1D case. A convergence of numerical results for the peristatic composite bar to the corresponding exact evaluation for the local elastic theory are shown.
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9

Bou-Zeid, Elie, Charles Meneveau, and Marc B. Parlange. "Applications of the Lagrangian Dynamic Model in LES of Turbulent Flow Over Surfaces With Heterogeneous Roughness Distributions." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56127.

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We study turbulent flow over surfaces with varying roughness scales, using large eddy simulation (LES). The goal is to use LES results to formulate effective boundary conditions in terms of effective roughness height and blending height, to be used for RANS. The LES are implemented with the dynamic Smagorinsky model based on the Germano identity. However, as is well-known, when this identity is applied locally, it yields a coefficient with unphysically strong fluctuations and averaging is needed for better realism and numerical stability. The traditional approach consists of averaging over homogeneous directions, for example horizontal planes in channel flow. This requirement for homogeneous directions in the flow field and the concomitant inability to handle complex geometries renders the use of this model questionable in studying the effect of surface heterogeneity. Instead, a new version of the Lagrangian dynamic subgrid-scale (SGS) model [1] is implemented. A systematic set of simulations of flow over patches of differing roughness is performed, covering a wide range of patch length scales and surface roughness values. The simulated mean velocity profiles are analyzed to identify the height of the blending layer and used to measure the effective roughness length. Extending ideas introduced by Miyake [2] and Claussen [3], we have proposed a simple expression for effective surface roughness and blending height knowing local surface patch roughness values and their lengths [4]. Results of the model agreed well with the LES results when the heterogeneous surface consisted of patches of equal sizes. The model is tested here for surfaces with patches of different sizes.
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10

Arif, Tariq M., and Zhiming Ji. "A Fast Estimation Model for Angular Spectrum Based Focused Ultrasound Wave Simulation in Layered Tissue Media." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11088.

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Abstract High-Intensity Focused Ultrasound (HIFU) is a popular non-invasive therapeutic tool and widely used in many clinical settings. The simulation models used for HIFU responses are computationally expensive and time-consuming. Among many numerical HIFU simulation methods, the Rayleigh-Sommerfeld approach is considered to be a reliable one. However, Rayleigh-Sommerfeld is suitable for homogeneous medium, and for a heterogeneous media, many approximations should be made in order to reduce the calculation time. In this study, we propose a fast methodology for estimating focused ultrasound pressure-temperature field responses through layered tissue media. A computationally efficient nonlinear angular spectrum-based method that can address the effects of varying attenuations, reflections and refractions from tissue layers is implemented to calculate reference datasets. From the simulation datasets, a profile function coupled with a GUI code is constructed for estimating the pressure-temperature response by using a Gaussian function and a Genetic Algorithm. The HIFU response model illustrated in this study can be advantageous and time-effective when multiple simulations are required on a similar complex patient model, and it can be used to guide and reduce the sets of simulations required for planning HIFU treatment.
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Звіти організацій з теми "Homogeneous and heterogeneous sets"

1

Teitelbaum, Joshua C., Francesca Molinari, Maura Coughlin, and Levon Barseghyan. Heterogeneous Choice Sets and Preferences. The IFS, July 2019. http://dx.doi.org/10.1920/wp.cem.2019.3719.

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2

Olsen, R. J., W. R. Williams, X. Song, L. D. Schmidt, and R. Aris. Dynamics of Homogeneous-Heterogeneous Reactors. Fort Belvoir, VA: Defense Technical Information Center, January 1992. http://dx.doi.org/10.21236/ada271694.

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3

Finkelstein, Maxim S. Shocks in homogeneous and heterogeneous populations. Rostock: Max Planck Institute for Demographic Research, August 2005. http://dx.doi.org/10.4054/mpidr-wp-2005-024.

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4

Meisel, Dan, Dan Bentley, Donald M. Camaioni, and Wendy S. Shaw. The NOx System in Homogeneous and Heterogeneous Nuclear Waste. Office of Scientific and Technical Information (OSTI), June 2001. http://dx.doi.org/10.2172/834611.

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5

Meisel, Dan, John Bentley, Donald M. Camaioni, and Wendy J. Shaw. THE NOx SYSTEM IN HOMOGENEOUS AND HETEROGENEOUS NUCLEAR WASTE. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/834614.

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6

Dan Meisel, John Bentley, Ian Carmichael, Daniel Chipman, Gordon Hug, Donald Camaioni, Wendy Shaw, M. Dupuis, S.T. Autrey, and W.D. Shaw. The NOx System in Homogeneous and Heterogeneous Nuclear Waste. Office of Scientific and Technical Information (OSTI), August 2005. http://dx.doi.org/10.2172/850371.

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7

Kahler, A. C. Homogeneous critical Monte Carlo eigenvalue calculations with revised ENDF/B-VI data sets. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/48679.

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8

Shilov, V. P., A. A. Bessonov, A. Y. Garnov, and A. V. Gelis. Investigation on application of homogeneous and heterogeneous catalysis for alkaline waste treatment. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/555272.

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9

Chernov, A. A., and J. L. Belof. Homogeneous vs. Heterogeneous Nucleation Modes of Solidification at Strong Driving Force Conditions. Office of Scientific and Technical Information (OSTI), April 2018. http://dx.doi.org/10.2172/1459152.

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10

Hua, Inez. An Investigation of Homogeneous and Heterogeneous Sonochemistry for Destruction of Hazardous Waste. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/827232.

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