Relevant bibliographies by topics / Aggregace

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Aggregace'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Aggregace.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Aggregace"

1

González-Fonteboa, B., and F. Martínez-Abella. "Hormigones con áridos reciclados: estudio de propiedades de los áridos y de las mezclas." Materiales de Construcción 55, no. 279 (September 30, 2005): 53–66. http://dx.doi.org/10.3989/mc.2005.v55.i279.198.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Powers, Matthew D., Christopher R. Webster, Kurt S. Pregitzer, and Brian J. Palik. "Spatial dynamics of radial growth and growth efficiency in residualPinus resinosafollowing aggregated retention harvesting." Canadian Journal of Forest Research 39, no. 1 (January 2009): 109–17. http://dx.doi.org/10.1139/x08-162.

Full text
Abstract:
Variable retention harvest systems are encouraged to promote complexity in managed forests, and aggregated retention has been suggested as a means of reducing moisture stress in residual trees. We studied the impacts of within-aggregate position on growth and foliar physiology to better understand the spatial dynamics of residual-tree responses to aggregated retention harvests in even-aged Pinus resinosa Ait. stands. Distance from edge and edge aspect influenced radial growth, volume increment, and growth efficiency, but only edge aspect affected foliar nitrogen content. Spatial variables had no significant relationships with foliar carbon isotope ratios (δ13C). Increases in radial growth, volume increment, and growth efficiency following harvesting were greatest near edges and in the northeastern quadrants of aggregates that received mechanical understory release treatments, and lowest in the southeastern quadrant of aggregates and near aggregate centers. Foliar nitrogen content was highest in the southwestern quadrants of aggregates that received understory release treatments, and lowest in the northwestern quadrants of aggregates. Our results suggest spatial relationships are important determinants of residual-tree responses to aggregated retention harvests.
APA, Harvard, Vancouver, ISO, and other styles
3

Gijsman, AJ, and RJ Thomas. "Aggregate size distribution and stability of an oxisol under legume-based and pure grass pastures in the eastern Colombian savannas." Soil Research 33, no. 1 (1995): 153. http://dx.doi.org/10.1071/sr9950153.

Full text
Abstract:
This study evaluated soil aggregate size distribution and stability of an Oxisol under improved grass-only or grass-legume pastures, established in previously native savanna. Three grass-legume combinations were included at various stocking rates. In all treatments and soil layers, soils were well aggregated, having more than 90% of their weight in macroaggregates (>250 �m). The addition of legumes to pastures did not affect the soil aggregate size distribution, although aggregates showed somewhat more stability against slaking. An increase in stocking rate negatively affected both average aggregate size and aggregate stability. Aggregates showed little or no dispersion of clay particles in any treatment. A positive correlation was found between wet aggregate stability and hot-water extractable carbohydrate concentration, supporting the hypothesis that these carbohydrates equate with plant-derived or microbial polysaccharides which glue soil aggregates together. It is suggested that determination of hot-water extractable carbohydrates may serve as a useful indicator of small differences in aggregate stability, even when these differences are not evident in the stability measurement itself.
APA, Harvard, Vancouver, ISO, and other styles
4

Gadea, J., J. Soriano, A. Martín, P. L. Campos, A. Rodríguez, C. Junco, I. Adán, and V. Calderón. "Reactividad árido-álcali en áridos empleados para hormigón." Materiales de Construcción 60, no. 299 (August 10, 2010): 69–78. http://dx.doi.org/10.3989/mc.2010.48708.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Alhede, Maria, Melanie Lorenz, Blaine Gabriel Fritz, Peter Østrup Jensen, Hans Christian Ring, Lene Bay, and Thomas Bjarnsholt. "Bacterial aggregate size determines phagocytosis efficiency of polymorphonuclear leukocytes." Medical Microbiology and Immunology 209, no. 6 (September 2, 2020): 669–80. http://dx.doi.org/10.1007/s00430-020-00691-1.

Full text
Abstract:
Abstract The ability of bacteria to aggregate and form biofilms impairs phagocytosis by polymorphonuclear leukocytes (PMNs). The aim of this study was to examine if the size of aggregates is critical for successful phagocytosis and how bacterial biofilms evade phagocytosis. We investigated the live interaction between PMNs and Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Staphylococcus epidermidis using confocal scanning laser microscopy. Aggregate size significantly affected phagocytosis outcome and larger aggregates were less likely to be phagocytized. Aggregates of S. epidermidis were also less likely to be phagocytized than equally-sized aggregates of the other three species. We found that only aggregates of approx. 5 μm diameter or smaller were consistently phagocytosed. We demonstrate that planktonic and aggregated cells of all four species significantly reduced the viability of PMNs after 4 h of incubation. Our results indicate that larger bacterial aggregates are less likely to be phagocytosed by PMNs and we propose that, if the aggregates become too large, circulating PMNs may not be able to phagocytose them quickly enough, which may lead to chronic infection.
APA, Harvard, Vancouver, ISO, and other styles
6

Alonso, M. M., A. Rodríguez, and F. Puertas. "Viability of the use of construction and demolition waste aggregates in alkali-activated mortars." Materiales de Construcción 68, no. 331 (July 9, 2018): 164. http://dx.doi.org/10.3989/mc.2018.07417.

Full text
Abstract:
This study explores the technological feasibility of using construction and demolition waste (C&DW) as recycled aggregate in alkali activated mortars, ascertaining the mechanical and microstructural behavior. Shrinkage behavior of alkali activated slag mortars (AAS) and fire resistance of alkali activated fly ash (AAFA) incorporating recycled aggregates have been also tested Normalized siliceous sand and two types of recycled concrete aggregates were used in the mixes at different proportions. The findings showed that water demand was higher in mortars prepared with recycled aggregate. Partial replacement (20% - 80/20) of conventional aggregate with the recycled material was also observed to yield mortars with high mechanical strength, although total porosity also rose. Total replaclement, gave worse mechanical performance however. Fire resistance and shrinkage studies conducted indicated that alkaline cement mortars prepared with 80/20 recycled aggregated exhibit acceptable performance.
APA, Harvard, Vancouver, ISO, and other styles
7

Allen, Leah M., John Matyas, Mark Ungrin, David A. Hart, and Arindom Sen. "Serum-Free Culture of Human Mesenchymal Stem Cell Aggregates in Suspension Bioreactors for Tissue Engineering Applications." Stem Cells International 2019 (November 7, 2019): 1–18. http://dx.doi.org/10.1155/2019/4607461.

Full text
Abstract:
Mesenchymal stem cells (MSCs) have the capacity to differentiate towards bone, fat, and cartilage lineages. The most widely used culture and differentiation protocols for MSCs are currently limited by their use of serum-containing media and small-scale static culture vessels. Suspension bioreactors have multiple advantages over static culture vessels (e.g., scalability, control, and mechanical forces). This study sought to compare the formation and culture of 3D aggregates of human synovial fluid MSCs within suspension bioreactors and static microwell plates. It also sought to elucidate the benefits of these techniques in terms of productivity, cell number, and ability to generate aggregates containing extracellular matrix deposition. MSCs in serum-free medium were either (1) inoculated as single cells into suspension bioreactors, (2) aggregated using static microwell plates prior to being inoculated in the bioreactor environment, or (3) aggregated using microwell plates and kept in the static environment. Preformed aggregates that were size-controlled at inoculation had a greater tendency to form large, irregular super aggregates after a few days of suspension culture. The single MSCs inoculated into suspension bioreactors formed a more uniform population of smaller aggregates after a definite culture period of 8 days. Both techniques showed initial deposition of extracellular matrix within the aggregates. When the relationship between aggregate size and ECM deposition was investigated in static culture, midsized aggregates (100-300 cells/aggregate) were found to most consistently maximize sGAG and collagen productivity. Thus, this study presents a 3D tissue culture method, which avoids the clinical drawbacks of serum-containing medium that can easily be scaled for tissue culture applications.
APA, Harvard, Vancouver, ISO, and other styles
8

Tohgi, Hideo, Hiroaki Takahashi, Katsumi Watanabe, Hiroyuki Kuki, and Yoshiaki Shirasawa. "Development of Large Platelet Aggregates from Small Aggregates as Determined by Laser-light Scattering: Effects of Aggregant Concentration and Antiplatelet Medication." Thrombosis and Haemostasis 75, no. 05 (1996): 838–43. http://dx.doi.org/10.1055/s-0038-1650376.

Full text
Abstract:
SummaryParticle-counting methods that employ light scattering (LS) quantify changes in the number of platelet aggregates of different sizes after the application of an aggregating stimulus. Using the LS method, we studied the effects of aggregant concentration, aspirin administration, and ticlopidine administration on aggregate formation and compared the results with those obtained using the conventional optical density (OD) method. Subjects were 47 controls, 31 patients treated with aspirin (330 mg/day), and 37 patients treated with ticlopidine (200 mg/day). Platelet aggregation after stimulation by 0.5, 1.0 or 5.0 μM ADP, or 0.5, 1.0 or 2.0 μg/ml collagen was determined using both methods. Using the LS method, small (9-25 μm), medium (25-50 μm), and large (50-70 μm) aggregates were counted. In patients untreated with antiplatelet medication, greater concentrations of ADP or collagen generated larger aggregates. Generation of small and medium-sized aggregates showed a significant positive correlation with OD levels after stimulation with 0.5 or 1.0 μM ADP, or 0.5 or 1.0 μg/ml collagen. In patients treated with aspirin, the development of small aggregates into large aggregates was inhibited. Thus, the number of small aggregates increased. Inhibition induced by aspirin was more effective against aggregation after stimulation with collagen than with ADP. In patients treated with ticlopidine, small and medium-sized aggregate formation was inhibited after stimulation with low concentrations of ADP or collagen, but was promoted after stimulation with high aggregant concentrations. The capability of the LS method to quantify different sizes of aggregates after stimulation with low concentration agonists may facilitate investigation of the aggregation process, and of how this process is affected by antiplatelet agents.
APA, Harvard, Vancouver, ISO, and other styles
9

Acebrón, Sergio P., Vanesa Fernández-Sáiz, Stefka G. Taneva, Fernando Moro, and Arturo Muga. "DnaJ Recruits DnaK to Protein Aggregates." Journal of Biological Chemistry 283, no. 3 (November 5, 2007): 1381–90. http://dx.doi.org/10.1074/jbc.m706189200.

Full text
Abstract:
Thermal stress might lead to protein aggregation in the cell. Reactivation of protein aggregates depends on Hsp100 and Hsp70 chaperones. We focus in this study on the ability of DnaK, the bacterial representative of the Hsp70 family, to interact with different aggregated model substrates. Our data indicate that DnaK binding to large protein aggregates is mediated by DnaJ, and therefore it depends on its affinity for the cochaperone. Mutations in the structural region of DnaK known as the “latch” decrease the affinity of the chaperone for DnaJ, resulting in a defective activity as protein aggregate-removing agent. As expected, the chaperone activity is recovered when DnaJ concentration is raised to overcome the lower affinity of the mutant for the cochaperone, suggesting that a minimum number of aggregate-bound DnaK molecules is necessary for its efficient reactivation. Our results provide the first experimental evidence of DnaJ-mediated recruiting of ATP-DnaK molecules to the aggregate surface.
APA, Harvard, Vancouver, ISO, and other styles
10

Tang, F. K., M. Cui, Q. Lu, Y. G. Liu, H. Y. Guo, and J. X. Zhou. "Effects of vegetation restoration on the aggregate stability and distribution of aggregate-associated organic carbon in a typical karst gorge region." Solid Earth 7, no. 1 (January 27, 2016): 141–51. http://dx.doi.org/10.5194/se-7-141-2016.

Full text
Abstract:
Abstract. Land use changes have a major impact on soil structure and soil nutrients. The influences of vegetation restoration on aggregate stability and soil carbon storage have been studied extensively, but the distribution of aggregate-associated carbon is not yet understood. The objective of this work was to study the influences of vegetation restoration on aggregate stability and distribution of soil organic carbon (SOC) associated with water-stable aggregates (WSAs) in a karst gorge region. The experiment was carried out in 2012 and included four land use types: bare land (BL), grassland (GL), shrubland (SL), and woodland (WL). Soil samples were collected from the 0–20, 20–40, and 40–60 cm depths, and aggregates were separated by a wet-sieving method. Aggregate stability and aggregated-associated SOC were determined, and the relationships between water-stable aggregation with SOC were examined. The results showed that total SOC and SOC associated with WSAs of various sizes were the highest at a soil depth of 0–20 cm. In addition, the SOC contents of the WSAs increased as the soil aggregate sizes decreased. The SOC contents of the WSAs < 0.25 mm were highest except in the bare land, and the SOC contents of the aggregates < 0.25 mm comprised the majority of the total aggregate SOC contents. The aggregates were dominated by particles with sizes > 5 mm under dry-sieving treatment, while aggregates were predominantly comprised of WSAs < 0.25 mm under wet-sieving treatment. At a soil depth of 0–60 cm, the mean weight diameter (MWD), geometrical mean diameter (GMD), and fractal dimensions (D) of the dry aggregates and water-stable aggregates in the different types of land were ranked, in descending order, as WL > GL > SL > BL. The contents of WSAs > 0.25 mm, MWD, and GMD increased significantly, in that order, and the percentage of aggregate destruction (PAD) and fractal dimensions decreased significantly as the soil aggregate stability improved. SOC contents increased after vegetation restoration, and the average SOC content of WL was 2.35, 1.37, and 1.26 times greater than that in the BL, GL, and SL, respectively. We conclude that woodland and grassland facilitated WSA stability and SOC protection; thus, promoting the natural restoration of vegetation by reducing artificial disturbances could effectively restore the ecology and prevent soil erosion in karst regions.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Aggregace"

1

Su, Haolin. "Properties of concrete with recycled aggregates as coarse aggregate and as-received/surface-modified rubber particles as fine aggregate." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6003/.

Full text
Abstract:
This research demonstrates that rubber particle size affects concrete workability and water permeability to a greater extent than fresh density and strength. Concrete with rubber particles of larger size tends to have a higher workability and fresh density than that with smaller particle sizes. However, rubber aggregates with smaller or continuously graded particle sizes are shown to have higher strengths and water permeability resistance. Influence of recycled aggregate and rubber aggregate as part substitutions for natural aggregates on concrete compressive strength was investigated and four equations were proposed to predict compressive strength of the designed concrete. Besides, it is experimentally shown that silane coupling agent (SCA) has a positive effect on reducing the loss of strength of rubber concrete, especially when concrete is weak. This effect becomes more significant with the increase of mass fraction of SCA solution. Experiment results also show a better performance of concrete with SCA-treated rubber than with as-received or sodium hydroxide solution (NaOH)-treated rubber. A brief cost analysis suggests that this approach of surface modification is economically viable. Referring to a provided fatigue load spectrum and fatigue failure mechanism, this method is potentially to be used for rubber concrete in high-cycle fatigue condition.
APA, Harvard, Vancouver, ISO, and other styles
2

Mummaneni, Santosh Kumar. "Evaluation of Canadian unconfined aggregate freeze-thaw tests for identifying nondurable aggregates." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/12030.

Full text
Abstract:
Master of Science
Department of Civil Engineering
Kyle Riding
Concrete is most widely used material in construction industry, which is made up of cement, water and aggregates as its major ingredients. Aggregates contribute to 60 to 75 % of the total volume of concrete. The aggregates play a key role in the concrete durability. The U.S Midwest has many aggregates that can show distress in the field under freezing and thawing conditions. The objective of this research was to determine if the Test Method for the Resistance of Unconfined Coarse Aggregate to Freezing and Thawing, method CSA A23.2-24A, could be used to differentiate good from poor performing aggregates in concrete. In this study fifty one KDOT aggregates (including twelve ledge and thirty nine production samples) were tested for freeze thaw resistance using CSA A23.2-24A test method and were compared to the results of the standard KDOT aggregate qualification tests. In addition to performing the CSA test method using a 3% sodium chloride solution, a subset of the aggregates were tested using either a 3% magnesium chloride or calcium chloride solution to determine the effects of the salt type on the aggregate performance. No correlation was found between the CSA A23.2-24A test method results and the standard KDOT aggregate qualification tests. The results also indicated that the mass loss in the CSA A23.2-24A was similar for the aggregate sizes tested. The use of alternate salt solutions like MgCl2 and CaCl2 resulted in increased freeze thaw mass loss in limestone aggregates.
APA, Harvard, Vancouver, ISO, and other styles
3

Johnsson, Markus. "Sterically stabilised liposomes and related lipid aggregates : fundamental studies on aggregate structure and stability /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5027-X/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Khachatryan, Hayk. "Spatial investigation of mineral transportation characteristics in the state of Washington." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/H_Khachatryan_122806.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Macalister, Hamish Campbell. "Aggregate earnings, forecasts and revisions: evaluation of the information in, and characteristics of, aggregated analysts' forecasts." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/7213.

Full text
Abstract:
I investigate the information in aggregated US equity analysts' earnings forecasts. Despite a voluminous body of research evaluating the information in, and characteristics of, equity analysts' forecasts, relatively little is known regarding aggregated forecasts. However, Kothari, Lewellen and Warner (2006) demonstrate how estimated relationships between, for example, earnings and returns may differ markedly at the aggregate level compared with the individual stock level. I generate time series of aggregated forecast earnings, aggregated forecast revisions and aggregated realized earnings for the period extending from the first quarter of 1979 through to the last quarter of 2009. These variables are employed in three examinations of aggregated earnings expectations. Firstly, prior research indicates significant information in analysts' forecasts for future realized earnings, and strong positive correlation between realized earnings and indicators of macroeconomic activity. I therefore hypothesize significant information in aggregated analysts' forecasts for future realized economic activity. Secondly, I investigate the informational efficiency of analysts' forecasts with respect to realized macroeconomic variables, and implications of earnings revision predictability for return predictability. Thirdly, I employ aggregated earnings revisions as proxies for market earnings surprise in tests of cash flow and discount rate effects in market returns. I find evidence of statistically significant information for future US industrial production growth in aggregated analysts' forecasts, the magnitude of which is a partial function of earnings smoothing by management, firm size and earnings cyclicality. I also find evidence of systematic underreaction by analysts to realized macroeconomic factors, resulting in revision predictability which in turn is able to explain significant systematic variation in future industry returns. In addition, my results suggest that the negative relationship between aggregated earnings surprise and contemporaneous returns identified by Kothari et al. (2006) is at least partially a product of the period they evaluate. In robustness tests employing both aggregated realized earnings and aggregated forecast revisions, I find evidence of positive (albeit insignificant) relationships between these proxies for earnings surprise and contemporaneous market returns. My results do not support the notion of a discount rate effect dominating a cash flow effect at the aggregate level.
Whole document restricted until Aug. 2013, but available by request, use the feedback form to request access.
APA, Harvard, Vancouver, ISO, and other styles
6

Petros, Robby A. "NMR study of 2-ethylhexyllithium aggregate and 2- ethylhexyllithium/lithium 2-ethyl-1-hexoxide mixed aggregates." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc3037/.

Full text
Abstract:
A 1H, 13C, and 6Li NMR study of 2-ethylhexyllithium showed that 2- ethylhexyllithium exists solely as a hexamer in cyclopentane solution over the temperature range from 25 to -65 °C. Furthermore, 2-ethylhexyllithium and lithium 2- ethyl-1-hexoxide were shown to form mixed aggregates when the alkoxide was formed in situ by reacting 2-ethylhexyllithium with 2-ethyl-1-hexanol. A multinuclear, variable temperature NMR study of a sample with an O:Li ratio of 0.2 led to the identification of at least four such aggregates, one of which was found to be a hexamer with the composition R5(RO)Li6. Studies of samples with higher O:Li ratios, up to 0.8, showed additional mixed aggregates present. All solutions containing mixed aggregates were also shown to contain hydrocarbon soluble lithium hydride. A study of lithium 2-ethyl-1- hexoxide indicated that it aggregates in solution as well.
APA, Harvard, Vancouver, ISO, and other styles
7

Fukuda, Jun. "Studies on development of analytical methods to quantify protein aggregates and prediction of soluble/insoluble aggregate-formation." Kyoto University, 2015. http://hdl.handle.net/2433/199349.

Full text
Abstract:
Kyoto University (京都大学)
0048
新制・課程博士
博士(農学)
甲第19025号
農博第2103号
新制||農||1030(附属図書館)
学位論文||H27||N4907(農学部図書室)
31976
京都大学大学院農学研究科応用生命科学専攻
(主査)教授 加納 健司, 教授 植田 和光, 教授 植田 充美
学位規則第4条第1項該当
APA, Harvard, Vancouver, ISO, and other styles
8

Gillmeister, Andrea Brigitta. "Why aggregate?" Thesis, University of York, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298588.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Williamson, Gregory Scott. "Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31822.

Full text
Abstract:
The Wisconsin Department of Transportation (WisDOT) uses approximately 11,000,000 tons of aggregate per year for transportation projects. Being able to select durable aggregates for use in transportation projects is of considerable importance, if the aggregate deteriorates then the constructed facility requires premature repair, rehabilitation or replacement. Realizing the importance and also that deficiencies in the current WisDOT testing protocol may exist, it has been concluded that the durability-testing program for Wisconsin aggregates needs to be updated. For example, WisDOT is currently using the Sodium Sulfate Soundness Test (ASTM C 88) to measure durability, a test that was put in place in 1960. The ability of this test to predict durability performance and simulate field conditions is questionable and it has also been criticized for its lack of precision. It should also be noted that the use of recycled and reclaimed aggregates has increased in recent years and not all typical durability tests can be used for testing these aggregates. The Sulfate Test in particular cannot be used for testing Recycled Concrete Aggregates (RCA) because the chemical reaction produces erroneous and misleading results. This project has identified recent advances in the understanding and testing of aggregate durability. An in depth literature review has been conducted and from the compiled information a laboratory testing program was developed. Selection of the tests was based upon the tests' precision, efficiency, and predictive capabilities. In the laboratory-testing phase of this project the proposed durability tests along with current WisDOT durability tests were used to evaluate the full range of Wisconsin aggregates. From the test results it was found that the WisDOT aggregate testing protocol could be reduced substantially by eliminating many of the testing requirements for aggregates that have a vacuum saturated absorption of less than 2%. Also, the addition of several tests was ruled out due to their lack of correlation with field performance records. The Micro-Deval abrasion test is recommended for inclusion in WisDOT testing protocol as a test to measure the abrasion resistance of aggregate while the L.A. Abrasion test is better suited as a measure of aggregate strength. Additional conclusions were made based on the durability testing conducted and an overall testing protocol has been developed and is recommended for implementation by WisDOT.
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
10

Kratochvíl, Jiří. "Alternativní kameniva na bázi druhotných surovin z energetického průmyslu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217094.

Full text
Abstract:
The current usage of both classical and fluid combustion ashes is not sufficient and they are deposited in large quantities. The focus of this master´s thesis is to determine and verify some possibilities of their suitable applications in construction industry, specifically as the alternative aggregates for concrete. After the performed analysis several systems based on both classical and fluid combustion ashes have been proposed. Portland cement and hydrated lime were used as admixtures and binding properties of fluid combustion ashes were also tested. The most important properties were compressive strength and bulk density. The aim was to appropriate an optimal ratio between the addition of modifying substance and resulting strength of prepared aggregate in order to correspond to standards for aggregates for concrete.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Aggregace"

1

Basu, Susanto. Aggregate productivity and the productivity of aggregates. Cambridge, MA: National Bureau of Economic Research, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

National Stone Association (U.S.), ed. The aggregates handbook. Alexandria, VA: National Stone, Sand and Gravel Association, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lee, E. J. Alkali-aggregate reaction 1977-1992: A definitive bibliography. Slough: British Cement Association, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lee, E. J. Alkali-aggregate reaction 1977-1992: A definitive bibliography. Slough: British Cement Association, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Caballero, Ricardo J. Aggregate investment. Cambridge, Mass: Dept. of Economics, Massachusetts Institute of Technology, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Caballero, Ricardo J. Aggregate investment. Cambridge, MA: National Bureau of Economic Research, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rasmi, Seyyed Amir Babak, and Metin Türkay. Aggregate Planning. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58118-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Faghih, Nezameddin, and Ahmad Talebnejad. Aggregate Production Planning. Shiraz: Farrassan, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Acemoglu, Daron. Aggregate comparative statics. Cambridge, MA: Massachusetts Institute of Technology, Dept. of Economics, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Aggregate economic choice. Berlin: Springer-Verlag, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Aggregace"

1

Weik, Martin H. "aggregate." In Computer Science and Communications Dictionary, 33. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_418.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Bobrowsky, Peter T. "Aggregate." In Encyclopedia of Earth Sciences Series, 18. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Gooch, Jan W. "Aggregate." In Encyclopedic Dictionary of Polymers, 22. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_324.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Bobrowsky, Peter T. "Aggregate." In Encyclopedia of Earth Sciences Series, 1–2. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-12127-7_9-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Costello, Tim, and Lori Blackshear. "Aggregate." In Prepare Your Data for Tableau, 131–35. Berkeley, CA: Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-5497-4_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sigloch, Herbert. "Aggregate." In Strömungsmaschinen, 433–41. München: Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.3139/9783446455573.013.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Stolterfoth, Ulf. "aggregate." In Im Hier und Jetzt, 339. Köln: Böhlau Verlag, 2019. http://dx.doi.org/10.7788/9783412514709.339.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sigloch, Herbert. "Aggregate." In Strömungsmaschinen, 433–41. München: Carl Hanser Verlag GmbH & Co. KG, 2013. http://dx.doi.org/10.3139/9783446436589.013.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Sigloch, Herbert. "Aggregate." In Strömungsmaschinen, 433–41. 7th ed. München: Carl Hanser Verlag GmbH & Co. KG, 2021. http://dx.doi.org/10.3139/9783446468504.013.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Harrison, Barry. "Aggregate Demand and Aggregate Supply." In Introductory Economics Course Companion, 130–36. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-13004-7_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Aggregace"

1

Wurzinger, L. J., K. Herbst, and H. Schmid-Schonbein. "PLATELET AGGREGATE-ASSOCIATED FIBRIN FORMATION AS A FUNCTION OF AGGREGATE SIZE AND HEPARIN CONCENTRATION." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644857.

Full text
Abstract:
The in vitro observation that fibrin forms withina few minutes in the crevices and niches inside and on the surface of platelet aggregates (PA), preparedfrom heparinized (5 U/ml) blood is consistent with the doubtful efficiency of heparin in the treatment of occlusive arterial disease (Thrcmb. Haemost. 46: 666,1981). Release of heparin- neutralizing proteins into limited and largely disclosed plasma compartments between aggregated platelets was held responsible for this remarkable phenomenon. However, the minimum number of aggregated platelets necessary to overcome the heparin inhibition remained undetermined then.PRP prepared from whole blood ant^coagulated with 0.5, 1 and 5 U/ml of mucosal heparin (Liquemin ), was aggregated with 10 or 100 pM ADP for 2 min at 37°C. Single PAs of various dimensions were withdrawn, washed, and incubated with a chromogenic substrate (S-2238, Kabi AB) to measure their thrombin content. Subsequently the number of platelets contained in the PA was evaluated by assaying the protein content of the aggregates. Microscopic PAs, their mass being toosmall to be determined precisely by a protein assay, were isolated with a filter technique, their extension was documented on photomicrographs for later calculation of aggregate volume and platelet content, before they were incubated with S-2238. Aggregates toosmall to develop detectable amidolytic activity, were checked microscopically for fibrin formed.S 2238 amidolytic activity (thrombin) in heparinizedPRP samples evolved as a linear function of the logarithm of PA mass. For a given heparin concentration (in whole blood) the following lowerthreshold platelet numbers of aggregates were found sufficient to allow the formation of detectable quantities of thrombin:These results suggest a fatal role platelet aggregates of minute dimensions may well play as a nidus of coagulation in fully heparinized blood.
APA, Harvard, Vancouver, ISO, and other styles
2

Liu, Fengshan, David R. Snelling, and Gregory J. Smallwood. "Numerical Study of Temperature and Incandescence Intensity of Nanosecond Pulsed-Laser Heated Soot Particles at High Pressures." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81322.

Full text
Abstract:
Histories of temperature and incandescence intensity of nanosecond pulsed-laser heated soot particles of polydispersed primary particles and aggregate sizes were calculated using an aggregate-based heat transfer model at pressures from 1 atm up to 50 atm. The local gas temperature, distributions of soot primary particle diameter and aggregate size assumed in the calculations were similar to those found in an atmospheric laminar diffusion flame. Relatively low laser fluences were considered to keep the peak particle temperatures below about 3400 K to ensure negligible soot particle sublimation. The shielding effect on the heat conduction between aggregated soot particles and the surrounding gas was accounted for based on results of direct simulation Monte Carlo calculations. After the laser pulse, the temperature of soot particles with larger primary particles or larger aggregates cools down slower than those with smaller primary particles or smaller aggregates due to smaller surface area-to-volume ratios. The effective temperature of soot particles in the laser probe volume was calculated based on the ratio of thermal radiation intensities of the soot particle ensemble at 400 and 780 nm. Due to the reduced mean free path of molecules with increasing pressure, the heat conduction between soot particles and the surrounding gas shifts from the free-molecular to the transition regime. Consequently, the rate of conduction heat loss from the soot particles increases significantly with pressure. The lifetime of laser-induced incandescence (LII) signal is significantly reduced as the pressure increases. At high pressures, the time resolved soot particle temperature is very sensitive to both the primary particle diameter and the aggregate size distributions, implying the time-resolved LII particle sizing techniques developed at atmospheric pressure lose their effectiveness at high pressures.
APA, Harvard, Vancouver, ISO, and other styles
3

Song, Yixuan, and Matthew J. Rau. "Disruption Behavior of Aggregates in a Rotating/Oscillating Cylindrical Tank and Implications for Particle Transport in the Ocean." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20237.

Full text
Abstract:
Abstract Particle size and settling speed determine the rate of particulate mass transfer from the ocean surface to the sea bed. Turbulent shear in the ocean can act on large, faster-settling flocculated particles to break them into slower-settling primary particles or sub-aggregates. However, it is difficult to understand the disruption behavior of aggregates and their response to varying shear forces due to the complex ocean environment. A study was conducted to simulate the disruption behavior of marine aggregates in the mixed layer of the ocean. The breakup process was investigated by aggregating and disrupting flocs of bentonite clay particles in a rotating and oscillating cylindrical tank 10 cm in diameter filled with salt water. This laboratory tank, which operated based on an extension of Stokes’ second problem inside a cylinder, created laminar oscillating flow superimposed on a constant rotation. This motion allowed the bentonite particles to aggregate near the center of the tank but also exposed large aggregates to high shear forces near the wall. A high-speed camera system was used, along with particle tracking measurements and image processing techniques, to capture the breakup of the large particle aggregates and locate their radial position. The breakup response of large aggregates and the sizes of their daughter particles after breakup were quantified using the facility. The disruption strength of the aggregated particles is presented and discussed relative to their exposure to varying amounts of laminar shear.
APA, Harvard, Vancouver, ISO, and other styles
4

Vaughan, D. E., and J. Loscalzo. "PLATELET DISAGGREGATION IN PLASMA--A NOVEL EFFECT OF TISSUE PLASMINOGEN ACTIVATOR." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644385.

Full text
Abstract:
Platelet aggregates are thought to play a significant role in many clinically important ischemic vascular events. Recently it has been shown that the platelet surface binds plasminogen and, in so doing, enhances its conversion to plasmin by tissue plasminogen activator (tPA). Since fibrinogen, an alternative substrate for plasmin, serves as the cohesive link among platelets induced to aggregate by a variety of agonists, we hypothesized that the local production of plasmin at the platelet surface may be important in promoting the disaggregation of aggregated platelets. When added to a suspension of human platelets induced to aggregate in plasma with adenosine 5'-diphosphate, tPA promoted disaggregation over several minutes. The rate of disaggregation and its extent were dependent on the concentration of tPA as well as on its time of addition. Preincubation of platelet-rich plasma with excess alpha-2-antiplasmin inhibited disaggregation by tPA. While platelet surface fibrinogen receptors did not appear to be proteolyzed by plasmin in this plasma system, platelet-bound cohesive fibrinogen was selectively proteolyzed compared with proteolysis of ambient fibrinogen. The rate of disaggregation correlated best with the rate of loss of platelet-bound fibrinogen and not with the rate of ambient fi-brinogenolysis. These data demonstrate that tPA facilitates platelet disaggregation through the plasmin-mediated proteolysis of cohesive fibrinogen. This phenomenon may be important in the dispersal of circulating platelet aggregates and may be operative in the thrombolysis of platelet-rich clots.
APA, Harvard, Vancouver, ISO, and other styles
5

Liu, Fengshan, and Gregory J. Smallwood. "Radiative Properties of Numerically Generated Fractal Soot Aggregates: The Importance of Configuration Averaging." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88224.

Full text
Abstract:
The radiative properties of numerically generated fractal soot aggregates were studied using the numerically accurate generalized multi-sphere Mie-solution method. The fractal aggregates investigated in this study contain from 10 to 600 primary particles of 30 nm in diameter. These fractal aggregates were numerically generated using a combination of the particle-cluster and cluster-cluster aggregation algorithms with fractal parameters representing flame generated soot. Ten different realizations were obtained for a given aggregate size measured by the number of primary particles. The wavelength considered is 532 nm and the corresponding size parameter of primary particle is 0.177. Attention is paid to the effect of different realizations of a fractal aggregate with identical fractal dimension, prefactor, primary particle diameter, and the number of primary particles on its orientation-averaged radiative properties. Most properties of practical interest exhibit relatively small variation with aggregate realization. However, other scattering properties, especially the vertical-horizontal differential scattering cross section, are very sensitive to the variation in geometrical configuration of primary particles. Orientation-averaged radiative properties of a single aggregate realization are not always sufficient to represent the properties of random-oriented ensemble of fractal aggregates.
APA, Harvard, Vancouver, ISO, and other styles
6

Freeman, L., V. Hornsey, D. S. Pepper, P. R. Foster, L. Winkelman, and J. Dawes. "PROTEIN AGGREGATES IN HEATED BLOOD PRODUCTS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644019.

Full text
Abstract:
Heating of blood products to reduce viral infectivity is now a standard practice. Such treatment may also modify the constituent proteins, reducing their activity or altering their structure with potentially harmful consequences for the recipient. Partially denatured proteins frequently form aggregates, which are often immunogenic and could precipitate immune complex formation, allergic reactions and kidney damage. In addition they may contribute to the development of AIDS after HIV infection by inducing a persistent state of T-cell activation.Protein aggregate formation in factor VIII and factor IX (II + X) concentrates has been investigated by fast protein liquid chromatography (FPLC), which proved to be a rapid, convenient method for this purpose. Freeze-drying alone resulted in aggregate formation in intermediate purity FVIII concentrates, but not in FIX concentrates. However, aggregates were detected after heating the FIX concentrate at 80°C for 72h in the dry state. Dry heating of intermediate purity FVIII concentrates to 68°C for 24h also increased the content of protein aggregates, which contained fibrinogen and fibronectin but little IgG. In this product, the aggregate content after heating correlated with total protein concentration. A higher purity FVIII concentrate selectively depleted in fibrinogen and fibronectin also contained protein aggregates after freeze-drying, but heating this product at 80°C for 72h resulted in a relatively small increase in aggregate content. Haemophiliacs receiving regular injections of heated concentrates are constantly exposed to protein aggregates. They should be monitored for any harmful effects, and manufacturers should aim to reduce the aggregate content of their products.
APA, Harvard, Vancouver, ISO, and other styles
7

Williams, Alicia M., and Pavlos P. Vlachos. "Spatiotemporally-Resolved Dynamics of Dispersing Ferrofluid Aggregates." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55275.

Full text
Abstract:
Ferrohydrodynamics research has been approached predominantly from either numerical or basic experimental techniques. However, to date, these experimental techniques have been limited to ultrasonic point measurements or shadowgraphs due to the opacity of the ferrofluids. As a result, the complete dynamics of many ferrohydrodynamics flows have remained unexplored. In this work, Time Resolved Digital Particle Image Velocimetry (TRDPIV) is employed to fully resolve the dynamic interaction of ferrofluid aggregates with bulk nonmagnetic fluids. This topic is hydrodynamically rich, where shearing between the aggregate and bulk flow develop into the Kelvin-Helmholtz instability. Ferrofluid aggregates are mixed with fluorescent particles in order to enable visualization of the internal flow structure of the aggregate and generate quantitative velocity measurements. The TRDPIV measurements are made in a 15 mm square channel where ferrofluid retained by a 0.5 Tesla permanent magnet is studied as it disperses. The effects of both steady and pulsatile flows are quantified, as are the impact of varying the magnetic field gradients. In both steady and pulsatile flows, a recirculation region is observed within the ferrofluid, driven by the shear layer between the bulk flow and aggregate interface. The interaction of the aggregate with the flow is also governed by the aggregate height relative to that of the test section. Higher, larger aggregates are less stable, and therefore, more likely to be dispersed by the bulk flow. As the aggregate diminishes in size, it is both more stable and is less subject to shearing forces from the flow. Flow pulsatility enriches the dynamics of the flow and generates complex flow structures resulting from interaction between the aggregate and bulk flow. This work is the first to explore the rich spatiotemporal behavior of dispersing ferrofluid aggregates interacting with steady and unsteady bulk flows.
APA, Harvard, Vancouver, ISO, and other styles
8

Williams, Alicia M., and Pavlos P. Vlachos. "The Dynamics of Accumulating Ferrofluid Aggregates." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55101.

Full text
Abstract:
The physics of steady and pulsatile flows laden with superparamagnetic nanoparticles in a square channel accumulating under the influence of a 0.5 Tesla permanent magnet are studied by means of focused shadowgraphs. The accumulation physics of these nanoscale particles is explored as functions of the flow type (steady and unsteady) and accumulation type (injected from the top of channel versus bottom of channel). Ferrofluid is accumulated by the steady injection of a streakline that enters the test section upstream of the magnet, where an aggregate forms. The interfacial phenomena resulting from the interaction of the ferrofluid with the bulk flow is resolved using shadowgraph imaging, where a digital camera captures the side view of the aggregate. Ferrofluid aggregate physics is examined both visually in the raw frames as well as by post-processing to determine the aggregate size evolution in time and couple that bulk information with interfacial behavior using the Proper Orthogonal Decomposition (POD). The shadowgraphs show that the aggregate exhibits different regimes based on bulk flow Reynolds number, which is varied between 100 and 1000, based on the mean flow rate. The aggregate exhibits stable behavior at low Reynolds numbers, where it stretches as it grows and minimal decay of the aggregate occurs. At moderate Reynolds numbers above 400, inertial forces dominate the dynamics, and aggregates do not attain the same size and height as in low Reynolds number cases. Therefore, the interaction of the aggregate with the bulk flow is diminished. The accumulation of ferrofluids is positively impacted by increased magnetic field gradients for some Reynolds numbers, while very high or low magnetic field gradients result in smaller, unstable aggregates. This work is the first to study the accumulation of ferrofluid aggregates over such a large parameter space, which reveals many physics that were previously unexplored in ferrohydrodynamics.
APA, Harvard, Vancouver, ISO, and other styles
9

"Experimental Study on Fly-Ash Aggregate as a Lightweight Filler in a Structural Element." In Recent Advancements in Geotechnical Engineering. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901618-21.

Full text
Abstract:
Abstract. Light-weight structures are widely used in the construction field. Light-weight fillers such as aggregates can be used to improve weightless structures. Generally, standard aggregates cannot be used to attain the desired weight for light-weight structures. To determine a light-weight filler, the aggregates are made by using fly-ash along with cement mortar. Fly ash was collected from the Mettur Thermal power plant. Cement and fly-ash were mixed in a concrete mixer in a proportion of 30:70 with a water-cement ratio of 0.3 and it is mixed until the pellets are formed. The aggregates are replaced at different percentages such as 0%, 10%, 20%, and 30% respectively to the coarse aggregate. The properties such as compressive strength, split tensile strength and flexural strength were taken. The maximum strength was attained at 30% of fly-ash aggregate with a compressive strength of 46.47 N/mm2, split tensile strength of 14.85 N/mm2 and flexural strength of 3.80 N/mm2.
APA, Harvard, Vancouver, ISO, and other styles
10

Sunil, Rugma, Parvathy Panicker L, R. Megha, Athira K. Vijayan, and Ramaswamy K. P. "Preparation and Properties of Alkali Activated Coarse Aggregates Using Fly Ash and Slag." In International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.45.

Full text
Abstract:
Coarse aggregate is an essential component of concrete which influences the properties of concrete. Generally, natural crushed stones are being used for the concrete production. The increased demand of aggregates for concrete production can be countered by using alternate aggregates. Production of artificial aggregates from industrial wastes appear as a promising and sustainable alternative to natural aggregates as it helps in utilizing large amount of industrial byproducts in concrete, reduces environmental pollution and also relieves the issues involved in their waste disposal. Hence, this study aims at the utilization of industrial wastes (fly ash and slag) for the manufacture of synthetic aggregates which could be a potential sustainable alternative for the coarse aggregates. Cold bonded pelletized aggregates were prepared by using alkali-activated Class F fly ash and ground granulated blast furnace slag. Alkali mixture of sodium silicate (Na2SiO3) and 10M sodium hydroxide (NaOH) solution were used for the chemical activation of fly ash and slag. Two types of synthetic aggregates were prepared using the fabricated disc pelletizer; mix containing only slag and another mix with equal proportion of fly ash and slag, and the aggregates were heat cured for 24 hours. Tests were done to determine properties such as aggregate surface texture and shape, particle size distribution, bulk density and specific gravity, and the results were compared with the properties of normal aggregates (natural crushed stones). The results indicate that synthetic aggregates made by alkali activation of fly ash and slag could be a potential alternative to the crushed stones.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Aggregace"

1

Basu, Susanto, and John Fernald. Aggregate Productivity and the Productivity of Aggregates. Cambridge, MA: National Bureau of Economic Research, December 1995. http://dx.doi.org/10.3386/w5382.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sneed, Lesley H., Samantha Wermager, and Kristian Krc. Interface Shear Transfer of Lightweight Aggregate Concretes with Different Lightweight Aggregates. Precast/Prestressed Concrete Institute, 2016. http://dx.doi.org/10.15554/pci.rr.comp-005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Caballero, Ricardo. Aggregate Investment. Cambridge, MA: National Bureau of Economic Research, November 1997. http://dx.doi.org/10.3386/w6264.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Putnam, Roger S. Aggregate Filter. Fort Belvoir, VA: Defense Technical Information Center, March 1989. http://dx.doi.org/10.21236/ada215029.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gavazza, Alessandro, Simon Mongey, and Giovanni Violante. Aggregate Recruiting Intensity. Cambridge, MA: National Bureau of Economic Research, September 2016. http://dx.doi.org/10.3386/w22677.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bekaert, Geert, Robert Hodrick, and Xiaoyan Zhang. Aggregate Idiosyncratic Volatility. Cambridge, MA: National Bureau of Economic Research, June 2010. http://dx.doi.org/10.3386/w16058.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Thembeka Ncube, Ayanda, and Antonio Bobet. Use of Recycled Asphalt. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317316.

Full text
Abstract:
The term Reclaimed Asphalt Pavement (RAP) is used to designate a material obtained from the removal of pavement materials. RAP is used across the US in multiple applications, largely on asphalt pavement layers. RAP can be described as a uniform granular non-plastic material, with a very low percentage of fines. It is formed by aggregate coated with a thin layer of asphalt. It is often used mixed with other granular materials. The addition of RAP to aggregates decreases the maximum dry unit weight of the mixture and decreases the optimum water content. It also increases the Resilient Modulus of the blend but decreases permeability. RAP can be used safely, as it does not pose any environmental concerns. The most important disadvantage of RAP is that it displays significant creep. It seems that this is caused by the presence of the asphaltic layer coating the aggregate. Creep increases with pressure and with temperature and decreases with the degree of compaction. Creep can be mitigated by either blending RAP with aggregate or by stabilization with chemical compounds. Fly ash and cement have shown to decrease, albeit not eliminate, the amount of creep. Mechanical stabilizing agents such as geotextiles may also be used.
APA, Harvard, Vancouver, ISO, and other styles
8

Lomboy, Gilson, Douglas Cleary, Seth Wagner, Yusef Mehta, Danielle Kennedy, Benjamin Watts, Peter Bly, and Jared Oren. Long-term performance of sustainable pavements using ternary blended concrete with recycled aggregates. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40780.

Full text
Abstract:
Dwindling supplies of natural concrete aggregates, the cost of landfilling construction waste, and interest in sustainable design have increased the demand for recycled concrete aggregates (RCA) in new portland cement concrete mixtures. RCA repurposes waste material to provide useful ingredients for new construction applications. However, RCA can reduce the performance of the concrete. This study investigated the effectiveness of ternary blended binders, mixtures containing portland cement and two different supplementary cementitious materials, at mitigating performance losses of concrete mixtures with RCA materials. Concrete mixtures with different ternary binder combinations were batched with four recycled concrete aggregate materials. For the materials used, the study found that a blend of portland cement, Class C fly ash, and blast furnace slag produced the highest strength of ternary binder. At 50% replacement of virgin aggregates and ternary blended binder, some specimens showed comparable mechanical performance to a control mix of only portland cement as a binder and no RCA substitution. This study demonstrates that even at 50% RCA replacement, using the appropriate ternary binder can create a concrete mixture that performs similarly to a plain portland cement concrete without RCA, with the added benefit of being environmentally beneficial.
APA, Harvard, Vancouver, ISO, and other styles
9

Veldkamp, Laura, and Justin Wolfers. Aggregate Shocks or Aggregate Information? Costly Information and Business Cycle Comovement. Cambridge, MA: National Bureau of Economic Research, October 2006. http://dx.doi.org/10.3386/w12557.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Auclert, Adrien, and Matthew Rognlie. Inequality and Aggregate Demand. Cambridge, MA: National Bureau of Economic Research, February 2018. http://dx.doi.org/10.3386/w24280.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Aggregace' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography