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Journal articles on the topic 'Cluster formation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ahamad, Mohammed Gulam, Mohammed Faisal Ahmed, and Mohammed Yousuf Uddin. "Clustering as Data Mining Technique in Risk Factors Analysis of Diabetes, Hypertension and Obesity." European Journal of Engineering and Technology Research 1, no. 6 (2018): 88–93. http://dx.doi.org/10.24018/ejeng.2016.1.6.202.

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This investigation explores data mining using open source software WEKA in health care application. The cluster analysis technique is utilized to study the effects of diabetes, obesity and hypertension from the database obtained from Virginia school of Medicine. The simple k-means cluster techniques are adopted to form ten clusters which are clearly discernible to distinguish the differences among the risk factors such as diabetes, obesity and hypertension. Cluster formation was tried by trial and error method and also kept the SSE as low as possible. The SSE is low when numbers of clusters ar

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2

Larson, Richard B. "Galaxy Formation and Cluster Formation." Symposium - International Astronomical Union 126 (1988): 311–21. http://dx.doi.org/10.1017/s007418090004256x.

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A primary motivation for studying globular clusters is that, as the oldest known galactic fossils, they trace the earliest stages of galactic evolution; indeed, they may hold the key to understanding galaxy formation. Thus it is clearly of great importance to learn how to read the fossil record. To do this, we need to understand something about how the globular clusters themselves formed. Were they the first bound objects to form, or did they form in larger pre-existing systems of which they are just small surviving fragments? If the latter, what were the prehistoric cluster-forming systems li

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Gnedin, Oleg Y. "Modeling Formation of Globular Clusters: Beacons of Galactic Star Formation." Proceedings of the International Astronomical Union 6, S270 (2010): 381–84. http://dx.doi.org/10.1017/s1743921311000676.

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AbstractModern hydrodynamic simulations of galaxy formation are able to predict accurately the rates and locations of the assembly of giant molecular clouds in early galaxies. These clouds could host star clusters with the masses and sizes of real globular clusters. I describe current state-of-the-art simulations aimed at understanding the origin of the cluster mass function and metallicity distribution. Metallicity bimodality of globular cluster systems appears to be a natural outcome of hierarchical formation and gradually declining fraction of cold gas in galaxies. Globular cluster formatio

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WANG, Z. P., F. S. ZHANG, X. H. ZENG, F. WANG, S. F. ZHANG, and Y. P. ZHANG. "CLUSTER MATTER FORMATION IN CLUSTER COLLISIONS." International Journal of Modern Physics B 19, no. 15n17 (2005): 2465–70. http://dx.doi.org/10.1142/s0217979205031158.

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By using the tight-binding molecular dynamics simulations in cluster collisions, we give some evidences of the structures of ( Na 9)2 cluster dimer and ( Na 4)4 cluster tetramer from the dynamical point of view. We show that the ( Na 9)2 and ( Na 4)4 cluster matter may exist as intermediate states and finally decay to compact structure in real collision process. With a technique called "sharp cooling", the stable cluster structures ( Na 9)2 and ( Na 4)4 are brought into being to end. The eigen-mode frequencies of these clusters are obtained with Fourier transform of the velocity auto-correlati

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Kroupa, Pavel. "Star-cluster formation and evolution." Proceedings of the International Astronomical Union 2, S237 (2006): 230–37. http://dx.doi.org/10.1017/s1743921307001524.

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AbstractStar clusters are observed to form in a highly compact state and with low star-formation efficiencies, and only 10 per cent of all clusters appear to survive to middle- and old-dynamical age. If the residual gas is expelled on a dynamical time the clusters disrupt. Massive clusters may then feed a hot kinematical stellar component into their host-galaxy's field population thereby thickening galactic disks, a process that theories of galaxy formation and evolution need to accommodate. If the gas-evacuation time-scale depends on cluster mass, then a power-law embedded-cluster mass functi

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Кыдырбаева, И. "CLUSTER FORMATION POTENTIAL ANALYSIS." Vestnik Bishkek state university af. K. Karasaev 1, no. 59 (2022): 3–5. http://dx.doi.org/10.35254/bhu/2022.59.3.

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This article high lights the concept of the cluster and the advantages of the cluster approach, as well as in order to increase the competitiveness of the regional economy, it is necessary to determine an effective model of the regional economy that allows the maximum use of the existing potential. Cluster policy is one of the most common mechanisms for the implementation of state and regional economic policy. The main goal of implementing the cluster policy is to ensure high rates of economic growth and diversification of the economy by increasing the competitiveness of enterprises, suppliers

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M. Mampana, Kgwadi, Solly M. Seeletse, and Enoch M. Sithole. "Optimized consortium formation through cluster analysis." Problems and Perspectives in Management 14, no. 1 (2016): 117–26. http://dx.doi.org/10.21511/ppm.14(1).2016.13.

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Some problems cannot be solved optimally and compromises become necessary. In some cases obtaining an optimal solution may require combining algorithms and iterations. This often occurs when the problem is complex and a single procedure does not reach optimality. This paper shows a conglomerate of algorithms iterated in tasks to form an optimal consortium using cluster analysis. Hierarchical methods and distance measures lead the process. Few companies are desirable in optimal consortium formation. However, this study shows that optimization cannot be predetermined based on a specific fixed nu

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Shkoda, Мariana, and Yana Onofriichuk. "SYSTEMATIZATION OF SCIENTIFIC CONCEPTS AND THEORIES OF THE FORMATION OF CLUSTER-UNITED ENTERPRISES." Management 37, no. 1 (2024): 9–18. http://dx.doi.org/10.30857/2415-3206.2023.1.1.

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The purpose of the article is research and systematization of scientific concepts and theories regarding the formation of cluster-united enterprises. Research methods. In this study, when carrying out the systematization of scientific concepts and theories, the authors used general scientific research methods, in particular, to reveal the evolutionary foundations of the development of cluster theory, comparative analysis of scientific concepts of both foreign and domestic scientists regarding the development of cluster formations, the formation of cluster-united enterprises, the followin

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Smagulova, Zh B., and A. E. Mukhanova. "CLUSTERS AS A SUBJECT OF MODERN ECONOMY." Bulletin of the Korkyt Ata Kyzylorda University 58, no. 3 (2021): 214–21. http://dx.doi.org/10.52081/bkaku.2021.v58.i3.090.

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The article is devoted to the analysis of clusters as a new factor of increasing competitiveness in the modern economy. The initial preconditions for the formation of clusters are described (the presence of competitive enterprises, presence of competitive advantages for cluster development in region, geographical concentration, an extensive selection of participants, existence of links and interactions between cluster entities). The characteristic features of clusters are given (the possibility of research and development; qualification of the workforce; improvement of labor potential, collect

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ISLAM, Md NAZRUL, HIROSHI UYEDA, and KATSUHIRO KIKUCHI. "Formation mechanism of super cluster over the tropics." MAUSAM 50, no. 3 (2021): 283–88. http://dx.doi.org/10.54302/mausam.v50i3.1859.

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A large-scale cloud phenomenon was analyzed to understand its internal structure, organization and movement. A westward moving uncommon super cluster was shown to have developed in the study region while each cloud cluster moved FJESE. The super cluster has horizontal length 2000 km, life time more than 2 days, very low TBB (<210 K) cloud area ~40× 104 km2 and moved westward with a speed of ~6 m/s. These features are some what different from the usual properties of super cluster as reported in several works. It was found that new clouds successively formed and interacted between themselves,

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Lantu, Donald Crestofel, Sri Herliana, Mia Rosmiati, Qorri Aina, and Nur Lawiyah. "The Formation of Food Cluster in Indonesia." MATEC Web of Conferences 215 (2018): 02009. http://dx.doi.org/10.1051/matecconf/201821502009.

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Cluster has an important role in developing the existing resources in an area to be economic value. Companies gain competitive advantage through competing with each other. However, there is now an increased awareness that to ensure survival, it is necessary to balance industrial advocacy and personal interests. Thus, cluster operations are characterized by competition and cooperation, where the role of quadruple helix plays a role in it. SME clusters occur in every country, considering that SMEs are an important element in the economy of the country. Most SMEs in developing countries are locat

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Ermakova, Natalia A., and Lera A. Karimova. "Issues of Cluster Formation in East Germany." Administrative Consulting, no. 1 (169) (June 7, 2023): 63–77. https://doi.org/10.22394/1726-1139-2023-1-63-77.

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The article is devoted to modern innovation policy in Germany. The German government considers stimulation of cluster structures as a necessary condition for achieving high-tech development of the country, so the cluster policy is a component of German innovation policy. The article considers the concept of three-level organization of clusters, quantifies the value of regional asymmetry in investment in innovation. Based on the classification of clusters by M. Porter, using the methodology of the analysis of cluster sectors of the European Cluster Observatory, the author&rs

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Sills, Alison. "The emergence of multiple populations in radiation hydrodynamics simulations of cluster formation." Proceedings of the International Astronomical Union 14, S351 (2019): 337–40. http://dx.doi.org/10.1017/s1743921319006501.

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AbstractWe present a new approach to understanding star-to-star helium abundance variations within globular clusters. We begin with detailed radiation hydrodynamics simulations of cluster formation within giant molecular clouds, and investigate the conditions under which multiple populations could be created. Chemical enrichment occurs dynamically as the cluster is assembled. We test two extreme mechanisms for injection of enriched gas within the clusters, and find that realistic multiple populations can be formed in both mechanisms. The stochastic cluster formation histories are dictated by t

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Clarke, C. J. "Star Formation in Large N Clusters." Symposium - International Astronomical Union 207 (2002): 489–98. http://dx.doi.org/10.1017/s0074180900224297.

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We focus here on the gas dynamics of cluster formation and the early stellar dynamical evolution of young clusters. We point out that the condition that a cloud can fragment into a large number of pieces places rather particular constraints on its initial state; we also review the processes that shape the stellar IMF in cluster formation simulations. We show how N-body calculations and observations can be combined to discover the properties of clusters at the point at which they first become stellar dynamical (as opposed to gas dynamical systems). Finally, we touch on the question of how proto

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15

Zepf, Stephen E. "The Formation and Evolution of Star Clusters and Galaxies." Highlights of Astronomy 13 (2005): 347–49. http://dx.doi.org/10.1017/s1539299600015938.

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AbstractThis paper addresses the questions of what we have learned about how and when dense star clusters form, and what studies of star clusters have revealed about galaxy formation and evolution. One important observation is that globular clusters are observed to form in galaxy mergers and starbursts in the local universe, which both provides constraints on models of globular cluster formation, and suggests that similar physical conditions existed when most early-type galaxies and their globular clusters formed in the past. A second important observation is that globular cluster systems typi

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Piskunov, A. E., A. Just, N. V. Kharchenko, et al. "Global survey of star clusters in the Milky Way." Astronomy & Astrophysics 614 (June 2018): A22. http://dx.doi.org/10.1051/0004-6361/201732337.

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Context. The all-sky Milky Way Star Clusters (MWSC) survey provides uniform and precise ages, along with other relevant parameters, for a wide variety of clusters in the extended solar neighbourhood. Aims. In this study we aim to construct the cluster age distribution, investigate its spatial variations, and discuss constraints on cluster formation scenarios of the Galactic disk during the last 5 Gyrs. Methods. Due to the spatial extent of the MWSC, we have considered spatial variations of the age distribution along galactocentric radius RG, and along Z-axis. For the analysis of the age distri

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17

Gao, Wanying, Kehang Li, and Chunling Wei. "Satellite Cluster Formation Reconfiguration Based on the Bifurcating Potential Field." Aerospace 9, no. 3 (2022): 137. http://dx.doi.org/10.3390/aerospace9030137.

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The satellite cluster formation reconfiguration has received considerable attention in recent years. However, the traditional centralized control methods are challenging to apply to satellite clusters because of the enormous fuel consumption, and few studies have addressed the mathematical characterization of satellite clusters. This research aims to propose a mathematical characterization method for satellite clusters and investigate the formation reconfiguration control of satellite clusters. This study provided the five-element characterization method to represent the cluster characteristic

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Gnieusheva, Natalya. "СВІТОВИЙ ДОСВІД АКТИВІЗАЦІЇ ДІЯЛЬНОСТІ КЛАСТЕРІВ: НАУКОВОТЕХНІЧНЕ ТА РЕГІОНАЛЬНЕ ЛІДЕРСТВО". Economical 2, № 28 (2023): 70–75. http://dx.doi.org/10.31474/1680-0044-2023-2(28)-70-75.

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The article outlines the classical interpretation of the term "cluster" as a management category. It was determined that the expansion of the knowledge system of cluster management is a progressive phenomenon and a need for the practice of cluster formation, innovative design, management support in conditions of rapid information progress. The prerequisites for the activation of cluster formation in the world are outlined, namely changes in the competitive environment, the speed of globalization and internationalization processes, the rapid movement of information revolutions and the transitio

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Wang, Gicheol, Dongkyun Kim, and Gihwan Cho. "A Secure Cluster Formation Scheme in Wireless Sensor Networks." International Journal of Distributed Sensor Networks 8, no. 10 (2012): 301750. http://dx.doi.org/10.1155/2012/301750.

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In wireless sensor networks, clustering expedites many desirable functions such as load balancing, energy savings, and distributed key management. For secure clustering, it is very important to find compromised nodes and remove them during the initial cluster formation process. If some nodes are compromised and survive the censorship process, they can make some nodes have a different cluster view and can split a cluster into multiple clusters to deteriorate cluster quality as a whole. To resolve these problems, we propose a robust scheme against such attacks in this paper. First, our scheme ge

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Korobeishchikov, Nikolay, Aleksandr Zarvin, Valeriy Kaljada, and Mikhail Khodakov. "High Intensity Argon Cluster Beams Formation for Technological Processes." Siberian Journal of Physics 7, no. 2 (2012): 85–92. http://dx.doi.org/10.54362/1818-7919-2012-7-2-85-92.

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Modernization of experimental complex LEMPUS-1 was done. Experimental investigations of argon cluster beams formation for ion-cluster surface modification technology were performed. Intensity of cluster beams up to 5*1014 clusters per cm2 per sec with average cluster size about 1300 was obtained. It was found the optimal conditions for cluster beam formation

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Ishchenko, M., V. Masliukh, M. Hradov, P. Berczik, B. Shukirgaliyev, and C. Omarov. "Dynamical evolution of the open clusters with different star formation efficiencies and orbital parameters." Astronomy & Astrophysics 694 (January 30, 2025): A33. https://doi.org/10.1051/0004-6361/202452336.

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Context. Open star clusters are dynamic systems whose evolution is critically influenced by initial conditions such as star formation efficiency and orbital parameters. Understanding their dissolution mechanisms provides insight into stellar population dynamical mixing in the Milky Way. Aims. We aim to investigate the dynamical evolution and dissolution of initially non-virialised open clusters by examining how different global star formation efficiencies and orbital characteristics impact the cluster longevity and structural changes. We followed the evolution of the clusters up to their disso

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Ayustyana, E., S. A. Wibisono, and F. M. H. Sihombing. "Coal Characterization of South Sumatera Basin using the Unsupervised Machine Learning Method." IOP Conference Series: Earth and Environmental Science 830, no. 1 (2021): 012043. http://dx.doi.org/10.1088/1755-1315/830/1/012043.

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Abstract South Sumatra Basin is one of the sedimentary basins in Indonesia which has coal bearing formation, coal-bearing formations are rock formations that have coal layers in its area. Numerous coal proximate data (free moisture, total moisture, moisture, inherent moisture, ash content, fixed carbon, sulfur content) and ultimate data (carbon (C), hydrogen (H), oxygen (O), nitrogen (N) have been collected in this basin. This study aims to determine the characterization of coal in the South Sumatra Basin based on the proximate data and ultimate data using the unsupervised machine learning met

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Ayustyana, E., S. A. Wibisono, and F. M. H. Sihombing. "Coal Characterization of South Sumatera Basin using the Unsupervised Machine Learning Method." IOP Conference Series: Earth and Environmental Science 830, no. 1 (2021): 012043. http://dx.doi.org/10.1088/1755-1315/830/1/012043.

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Abstract South Sumatra Basin is one of the sedimentary basins in Indonesia which has coal bearing formation, coal-bearing formations are rock formations that have coal layers in its area. Numerous coal proximate data (free moisture, total moisture, moisture, inherent moisture, ash content, fixed carbon, sulfur content) and ultimate data (carbon (C), hydrogen (H), oxygen (O), nitrogen (N) have been collected in this basin. This study aims to determine the characterization of coal in the South Sumatra Basin based on the proximate data and ultimate data using the unsupervised machine learning met

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Márta Völgyiné Nadabán. "Formation of Food Clusters in Europe." Acta Agraria Debreceniensis, no. 44 (November 20, 2011): 55–59. http://dx.doi.org/10.34101/actaagrar/44/2606.

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In the dictionary of foreign words and phrases we can find the word “cluster” with the following sense: aggregation, group and in a wider meaning: association, integration.By explaining the geographical concentration of economical and innovation processes in the food processing sector, clusters, and especiallybusiness clusters, play an important role. This essay deals exclusively with business clusters, so the term cluster is used also for business cluster.I tried to collect the most relevant indicators determining the formation of clusters in the Food Processing Sectors and to analyze whether

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Lv, Yanan, and Dong Chen. "A molecular dynamics study of nanoscale titanium nitrides formation in ferrite." Modern Physics Letters B 34, no. 10 (2020): 2050099. http://dx.doi.org/10.1142/s0217984920500992.

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Molecular dynamics simulation was adopted to investigate the nanoscale titanium nitride formation at the early formation stage in high-strength low-alloy steel. During the cluster formation process, the nitride clusters were formed through the atom aggregation. The atomic interactions of titanium and nitride atoms were revealed and the cluster property was discussed. The nanoscale titanium nitride clusters own a wide composition, and the cluster formation mechanism was concluded.

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Odintsov, Nikita A., and Inessa V. Penkova. "Formation and Functioning of Regional Economic Clusters." Science Outpost, no. 4 (66) (2023): 17–22. https://doi.org/10.22394/2949-0855-2023-4-66-17-22.

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The article examines organizational and economic mechanism of formation and functioning of regional economic clusters and highlights its main features. The general principles of cluster formation are derived and cluster functioning in specific regions is considered. The ways of clusters formation and functioning, as well as the methods to evaluate their effectiveness is surveyed.

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Zepf, Stephen E. "Formation Scenarios for Globular Clusters and Their Host Galaxies." Symposium - International Astronomical Union 207 (2002): 653–63. http://dx.doi.org/10.1017/s0074180900224492.

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This review focuses on how galaxies and their globular cluster systems form. I first discuss the now fairly convincing evidence that some globular clusters form in galaxy starbursts/mergers. One way these observations are valuable is they place important constraints on the physics of the formation of globular clusters. Moreover, it is natural to associate the typically metal-rich clusters forming in mergers with the substantial metal-rich population of globulars around ellipticals, thereby implying an important role for galaxy mergers in the evolution of elliptical galaxies. I also highlight s

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Aliyeva, Aygun. "Methodological aspects of cluster policy formation in Azerbaijan." Technium Social Sciences Journal 10 (July 18, 2020): 274–79. http://dx.doi.org/10.47577/tssj.v10i1.1249.

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Foreign experience demonstrates that countries’ strategies in cluster policy differ depending on national traditions and culture of their strategy engineering process, as well as on the cluster concept. Analysis of information sources shows that technical and methodological framework for cluster policy formulation have not been clearly and unambiguously studied in science. The most important methodological document on cluster policy is the European Cluster Memorandum signed by the Member States of the European Union in 2006 [3]. It defined the essence and importance of clusters in innova

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Puzyrova, Polina V. "CONCEPT OF MANAGEMENT AND FORMATION OF FINANCIAL POTENTIAL OF CLUSTER UNIONS." Management 29, no. 1 (2019): 109–19. http://dx.doi.org/10.30857/2415-3206.2019.1.9.

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Introduction and purpose of research. A prerequisite for effective, stable and competitive functioning of cluster unions is the totality of its financial resources and capabilities – financial potential. The financial potential of a cluster is a combination of combined financial opportunities, resources and financial capital, the main purpose of the formation and use of which is to maximize income and maintain a stable competitive position in the market. Management and formation of the necessary size of the financial potential of cluster unions, which is necessary for the effective operation o

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Yukhnov, B. Y., D. O. Korsakov, and Y. V. Yukhman. "Actualization of the Use of the Cluster Model in the Innovative Development of the Economy of Ukraine." Business Inform 10, no. 525 (2021): 63–69. http://dx.doi.org/10.32983/2222-4459-2021-10-63-69.

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Unfortunately, one of the main problems of the Ukrainian economy is the State’s inability to concentrate available resources on the main, promising directions and involve Ukrainian businesses, both large and medium-sized, into this process. Therefore, the creation and development of clusters as an element of an innovative model is necessary, and the study of the issue of their functioning is quite relevant. The article is aimed at further studying the processes of clustering in Ukraine. An attempt was made, based on the theoretical basis for the development of innovative processes, as well as

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Fujii, Michiko S., Long Wang, Takayuki R. Saitoh, Yutaka Hirai, and Yoshito Shimajiri. "Formation process of the Orion Nebula Cluster." Proceedings of the International Astronomical Union 16, S362 (2020): 258–61. http://dx.doi.org/10.1017/s1743921322001508.

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AbstractThe Orion Nebula Cluster (ONC) is one of the nearest open clusters, which we can directly compare to numerical simulations. We performed a simulation of star cluster formation similar to the ONC using our new N-body/smoothed particle hydrodynamics code, ASURA+BRIDGE. We found that the hierarchical formation of star clusters via clump mergers can explain the observed three peaks in the stellar age distribution as well as the dynamically anisotropic structures of the ONC.

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Radygina, S. V. "CLUSTER POLICY AS A TOOL FOR THE DEVELOPMENT OF THE ECONOMY OF THE RUSSIAN REGIONS." Bulletin of Udmurt University. Series Economics and Law 31, no. 3 (2021): 394–402. http://dx.doi.org/10.35634/2412-9593-2021-31-3-394-402.

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The article researches theoretical aspects of formation and development of territorial clusters: their structure, approaches to definition, typology, key advantages. The regulatory framework for the implementation of cluster policy in the Russian Federation has been defined, as well as an analysis of the level of development achieved on the example of the Udmurt Republic. The main directions of cluster development at the federal level are considered: formation of innovation-territorial and industrial clusters. In each area, public support programmes and mechanisms have been investigated to ens

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van den Bergh, S. "Star clusters in the Magellanic Clouds." Symposium - International Astronomical Union 148 (1991): 161–64. http://dx.doi.org/10.1017/s0074180900200259.

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Star clusters in the Magellanic Clouds (MCs) differ from those in the Galaxy in a number of respects: (1) the Clouds contain a class of populous open clusters that has no Galactic counterpart; (2) Cloud clusters have systematically larger radii rh than those in the Galaxy; (3) clusters of all ages in the Clouds are, on average, more flattened than those in the Galaxy. In the Large Magellanic Cloud (LMC) there appear to have been two distinct epochs of cluster formation. LMC globulars have ages of 12-15 Gyr, whereas most populous open clusters have ages <5 Gyr. No such dichotomy is observed

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Randriamanakoto, Zara, and Petri Väisänen. "Young massive clusters in Arp 299." Proceedings of the International Astronomical Union 14, S351 (2019): 143–46. http://dx.doi.org/10.1017/s1743921319007701.

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AbstractBecause of their young ages and compact densities, young massive star clusters (YMCs) are widely considered as potential proto-globular clusters. They are ubiquitous in environments with ongoing star formation activity such as interacting luminous infrared galaxies. To determine the galactic environmental effects on the star cluster formation and evolution, we study the YMC population of Arp 299 (NGC 3690E/NGC 3690W) using data taken with the HST WFC3/UVIS camera. By fitting the multiband photometry with the Yggdrasil models, we derive the star cluster masses, ages and extinction. Whil

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Пелихов, Николай, Nikolay Pelihov, А. Родионова, and A. Rodionova. "Cluster Initiatives: Russian Realities and International Experience." Scientific Research and Development. Economics 7, no. 1 (2019): 37–42. http://dx.doi.org/10.12737/article_5c5989494eda30.66343488.

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The current dynamics of changes in the conditions of state support of cluster initiatives in Russian Federation is analyzed. It is noted that support for the processes of formation and development of clusters in our country is based mainly on political initiatives, but not on the identification of the composition laws of these complex system formations. On the example of international experience the necessity of strengthening the role of science and education institutions in the state-stimulated cluster initiatives, as well as the importance of the formation of advanced training programs for c

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Hwang, Narae, and Myung Gyoon Lee. "Tracing star cluster formation in the interacting galaxy M51." Proceedings of the International Astronomical Union 5, S266 (2009): 423–26. http://dx.doi.org/10.1017/s1743921309991591.

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AbstractWe present a study of star clusters in the interacting galaxy M51 using a star cluster catalog that includes about 3600 star clusters with mF555W < 23 mag, compiled by Hwang & Lee (2008). Combined with mF336W-band imaging data taken with the Hubble Space Telescope (HST)'s WFPC2 camera, we have derived the ages and masses of star clusters in M51 using theoretical population synthesis models. The cluster age distribution displays multiple peaks that correspond to the epochs of dynamical encounters predicted by theoretical model studies and the cluster-formation rate appears to inc

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Sayapina, K. V. "INNOVATION CLUSTERS FORMATION AS AN INSTRUMENT OF EFFECTIVE ECONOMIC MANAGEMENT." Strategic decisions and risk management, no. 6 (October 25, 2014): 88–95. http://dx.doi.org/10.17747/2078-8886-2013-6-88-95.

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The nature of innovation cluster and its distinction from regional cluster on base of leading cluster theories’ analysis is explained. Foreign and Russian models of forming innovation clusters’ description is presented. Types of Russian innovation clusters with their appropriate problems and disadvantages are analyzed in comparison with international experience. Tendencies of innovation clusterization policy in states as an effective method of managing economy are underlined.

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Lee, Seong-Kook, Myungshin Im, Eunhee Ko, et al. "Star-formation Property of High Redshift Galaxies in Clusters: Perceptive View from Observation and Simulation." Proceedings of the International Astronomical Union 17, S373 (2021): 260–63. http://dx.doi.org/10.1017/s1743921322004409.

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AbstractThe evolution of star formation properties of galaxies depends on the environment where galaxies reside, and generally star formation of galaxies in dense environment decreases more quickly. Interestingly, the star formation property of high-redshift galaxies clusters vary largely even though they are at similar redshift. We have found that the large-scale environment surrounding each galaxy cluster can contribute to make this cluster-by-cluster variation. This correlation is found in the results from observational data as well as in the simulations of galaxy formation. We suggest the

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Liu, Ling, Hao Li, Haijie Zhang, et al. "The role of nitric acid in atmospheric new particle formation." Physical Chemistry Chemical Physics 20, no. 25 (2018): 17406–14. http://dx.doi.org/10.1039/c8cp02719f.

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Pfeffer, Joel, Nate Bastian, J. M. Diederik Kruijssen, Marta Reina-Campos, Robert A. Crain, and Christopher Usher. "Young star cluster populations in the E-MOSAICS simulations." Monthly Notices of the Royal Astronomical Society 490, no. 2 (2019): 1714–33. http://dx.doi.org/10.1093/mnras/stz2721.

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ABSTRACT We present an analysis of young star clusters (YSCs) that form in the E-MOSAICS cosmological, hydrodynamical simulations of galaxies and their star cluster populations. Through comparisons with observed YSC populations, this work aims to test models for YSC formation and obtain an insight into the formation processes at work in part of the local galaxy population. We find that the models used in E-MOSAICS for the cluster formation efficiency and high-mass truncation of the initial cluster mass function ($M_\rm {c,\ast }$) both quantitatively reproduce the observed values of cluster po

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SHPYLOVA, Vira. "World experience of innovative cluster model of regional development: priorities of adaptation in Ukraine." Economics. Finances. Law, no. 6/1 (June 26, 2020): 28–32. http://dx.doi.org/10.37634/efp.2020.6(1).6.

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Introduction. In many countries around the world, globalization is accompanied by the intensification of clustering processes, which is recognized as the best opportunity to strengthen and develop small and medium-sized businesses, increase the competitiveness of enterprises in the development of international relations and interregional partnerships. Cluster formations are relevant for developed countries, as well as for those in the development stage, in which small and medium-sized businesses are the basis of the economy, provide the production of the bulk of GDP and provide employment for

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Evers, Hans-Dieter, and Solvay Gerke. "Knowledge Cluster Formation as a Science Policy in Malaysia: Lessons Learned." Journal of Current Southeast Asian Affairs 34, no. 1 (2015): 115–37. http://dx.doi.org/10.1177/186810341503400105.

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Regional science policy aims to create productive knowledge clusters, which are central places within an epistemic landscape of knowledge production and dissemination. These so-called K-clusters are said to have the organisational capability to drive innovations and create new industries. Many governments have used cluster formation as one of their development strategies. This paper looks at Malaysia's path towards a knowledge-based economy and offers some evidence on the current state of knowledge cluster formation in that country. If the formation of a knowledge cluster has been the governme

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SOLOV'YOV, ILIA A., ANDREY V. SOLOV'YOV, and WALTER GREINER. "FUSION PROCESS OF LENNARD–JONES CLUSTERS: GLOBAL MINIMA AND MAGIC NUMBERS FORMATION." International Journal of Modern Physics E 13, no. 04 (2004): 697–736. http://dx.doi.org/10.1142/s0218301304002454.

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We present a new theoretical framework for modeling the fusion process of Lennard–Jones (LJ) clusters. Starting from the initial tetrahedral cluster configuration, adding new atoms to the system and absorbing its energy at each step, we find cluster growing paths up to the cluster size of 150 atoms. We demonstrate that in this way all known global minima structures of the LJ-clusters can be found. Our method provides an efficient tool for the calculation and analysis of atomic cluster structure. With its use we justify the magic number sequence for the clusters of noble gas atoms and compare i

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Akhiiezer, Оlena, Olha Dunaievska, Anton Rohovyi, Halyna Holotaistrova, Yurii Reshetniak, and Serhii Mekhovych. "ECONOMIC-MATHEMATICAL MODEL OF FORMATION OF INNOVATION AND ENGINEERING INDUSTRIAL CLUSTER." Innovative Technologies and Scientific Solutions for Industries, no. 1 (23) (April 20, 2023): 5–13. http://dx.doi.org/10.30837/itssi.2023.23.005.

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The subject of the article is the use of industrial clusters as tools for innovative economic growth. The purpose of the article is to develop an economic-mathematical model of the formation of an industrial cluster, and to create an algorithm for cluster zoning of the economy. Tasks to be solved – analysis of the principles of innovative growth, development of a model of an innovation-engineering industrial cluster, formulation of a methodology for the formation of a regional innovation-engineering cluster, analysis and assessment of the features that arise in clusters, use of cluster analysi

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Li, Hui, and Oleg Gnedin. "Formation and evolution of globular clusters in cosmological simulations." Proceedings of the International Astronomical Union 14, S351 (2019): 34–39. http://dx.doi.org/10.1017/s1743921319007646.

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AbstractIn a series of three papers, we introduced a novel cluster formation model that describes the formation, growth, and disruption of star clusters in high-resolution cosmological simulations. We tested this model on a Milky Way-sized galaxy and found that various properties of young massive clusters, such as the mass function and formation efficiency, are consistent with observations in the local universe. Interestingly, most massive clusters – globular cluster candidates – are preferentially formed during major merger events. We follow the dynamical evolution of clusters in the galactic

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MELINON, P., V. PAILLARD, V. DUPUIS, et al. "FROM FREE CLUSTERS TO CLUSTER-ASSEMBLED MATERIALS." International Journal of Modern Physics B 09, no. 04n05 (1995): 339–97. http://dx.doi.org/10.1142/s021797929500015x.

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In this paper the specific properties of free clusters and the formation of new cluster-assembled materials using the low energy cluster beam deposition (LECBD) technique are discussed. Recent results obtained for free clusters are summarized with special attention to new observed structures. As for the specific structures and properties of cluster-assembled materials, two main aspects are specially emphasized: the memory effect of the free cluster properties leading to the formation of new phases and the effect of the specific nanostructure of the cluster-assembled materials related to the ra

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Li, Jin Zeng, and Michael D. Smith. "Triggered cluster formation in the RMC." Proceedings of the International Astronomical Union 2, S237 (2006): 439. http://dx.doi.org/10.1017/s174392130700227x.

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AbstractA comprehensive study of clustered star formation in the Rosette Molecular Complex was carried out based on archived data from the 2 Micron All Sky Survey. We presented strong evidence that triggered formation of embedded clusters and stellar aggregates took place in the working shells of the Rosette Nebula, a spectacular HII region excavated by the dozens of OB stars of the emerging massive cluster NGC 2244. Surprisingly, we have identified, within the confines of NGC 2244, a distinct congregation of young stellar objects showing prominent NIR excess that forms an arc like structure i

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Farias, Juan P., Jonathan C. Tan, and Sourav Chatterjee. "Star cluster formation from turbulent clumps. II. Gradual star cluster formation." Monthly Notices of the Royal Astronomical Society 483, no. 4 (2018): 4999–5019. http://dx.doi.org/10.1093/mnras/sty3470.

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Lange, K., C. Dominik, and A. G. G. M. Tielens. "Stability of polycyclic aromatic hydrocarbon clusters in protoplanetary discs." Astronomy & Astrophysics 653 (September 2021): A21. http://dx.doi.org/10.1051/0004-6361/202140590.

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Context. The infrared signature of polycyclic aromatic hydrocarbons (PAHs) is present in many protostellar discs, and these species are thought to play an important role in the heating of the gas in the photosphere. Aims. We consider PAH cluster formation as one possible cause for non-detections of PAH features in protoplanetary discs. We test the necessary conditions for cluster formation and cluster dissociation by stellar optical and far-UV photons in protoplanetary discs using a Herbig Ae/Be and a T Tauri star disc model. Methods. We perform Monte Carlo and statistical calculations to dete

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Parmentier, Geneviève. "Early dynamical evolution of star cluster systems." Proceedings of the International Astronomical Union 5, S266 (2009): 87–94. http://dx.doi.org/10.1017/s1743921309990913.

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AbstractViolent relaxation, the protocluster dynamical response to the expulsion of its residual star-forming gas, is a short albeit crucial episode in the evolution of star clusters and star cluster systems. Because it is heavily driven by cluster-formation and environmental conditions, it is a potentially highly rewarding phase in terms of probing star formation and galaxy evolution. In this contribution, I review how cluster-formation and environmental conditions affect the shape of the young cluster mass function and the relation between the present star-formation rate of galaxies and the

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