Journal articles: 'Star designs'

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Küçükçi̇fçi̇, Selda, Giovanni Lo Faro, Salvatore Milici, and Antoinette Tripodi. "Resolvable 3-star designs." Discrete Mathematics 338, no. 4 (April 2015): 608–14. http://dx.doi.org/10.1016/j.disc.2014.11.013.

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Hoffman, D. G., and Dan Roberts. "Embedding Partialk-Star Designs." Journal of Combinatorial Designs 22, no. 4 (May 17, 2013): 161–70. http://dx.doi.org/10.1002/jcd.21353.

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Hoffman, D. G. "The real truth about star designs." Discrete Mathematics 284, no. 1-3 (July 2004): 177–80. http://dx.doi.org/10.1016/j.disc.2004.02.002.

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Billington, Elizabeth J., and D. G. Hoffman. "The intersection problem for star designs." Discrete Mathematics 179, no. 1-3 (January 1998): 217–22. http://dx.doi.org/10.1016/s0012-365x(97)00092-7.

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Refaee, Eshrag A., and Ali Ahmad. "A Study of Hexagon Star Network with Vertex-Edge-Based Topological Descriptors." Complexity 2021 (April 26, 2021): 1–7. http://dx.doi.org/10.1155/2021/9911308.

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There are many network topology designs that have emerged to fulfill the growing need for networks to provide a robust platform for a wide range of applications like running businesses and managing emergencies. Amongst the most famous network topology designs are star network, mesh network, hexagonal network, honeycomb network, etc. In a star network, a central computer is linked with various terminals and other computers over point-to-point lines. The other computers and terminals are directly connected to the central computer but not to one another. As such, any failure in the central computer will result in a failure of the entire network and computers in star network will not be able to communicate. The star topology design can be represented by a graph where vertices represent the computer nodes and edges represent the links between the computer nodes. In this paper, we study the vertex-edge-based topological descriptor for a newly designed hexagon star network.

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Noble, Matt, and Shayne N. Richardson. "Balls, bins, and embeddings of partial k-star designs." Discrete Mathematics 342, no. 12 (December 2019): 111600. http://dx.doi.org/10.1016/j.disc.2019.111600.

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Stürmer, Jörg. "Katarakt – Grauer Star." Therapeutische Umschau 66, no. 3 (March 1, 2009): 167–71. http://dx.doi.org/10.1024/0040-5930.66.3.167.

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Die Katarakt ist die häufigste Erblindungsursache weltweit (20 Millionen Blinde/Sehbehinderte). Die häufigste Form der Katarakt ist die altersabhängige Katarakt. Die einzige mögliche Behandlung ist die Operation, die in den industrialisierten Ländern die häufigste Operation überhaupt darstellt. Indikation für eine Kataraktoperation ist, dass die Sehkraft den Bedürfnissen des Patienten nicht mehr entspricht. Die heutige Operationstechnik ist die Verflüssigung des harten Anteils der getrübten Linse mittels Phakoemulsifikation und die Implantation einer faltbaren Kunstlinse durch einen < 3 mm groβen selbstdichtenden Schnitt. Bei einem Groβteil der Patienten kann diese Operation ambulant in Lokalanästhesie (meist Tropfen) durchgeführt werden. Schwere Komplikationen sind selten (< 1%), können aber im Extremfall zum Verlust der Sehkraft führen (< 1‰). Neue Entwicklungen spielen sich heute praktisch ausschlieβlich im Bereich des Designs und von Zusatzfunktionen der Intraokularlinsen ab.

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Zhao, Dahang, Dichao Huang, Chen Wang, and Xin Xin Ma. "Can Specific Implant Designs Implicate Variations in Outcomes of Total Ankle Arthroplasty? A Systematic Review." Foot & Ankle Orthopaedics 2, no. 3 (September 1, 2017): 2473011417S0004. http://dx.doi.org/10.1177/2473011417s000435.

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Category: Ankle Arthritis Introduction/Purpose: Some complications of total ankle arthroplasty could not be reduced by improvement of surgeon experience. The purposes of the study were to determine whether there were variations in term of (1) intraoperative complications, (2) postoperative complication, (3) reoperation, revision and failure, and (4) postoperative radiographic findings among different studies. Methods: A comprehensive search was conducted. There were 953 for initial review. Initially, 136 irrelevant records, 174 review articles, 46 case reports and 1 retracted paper were excluded. Of the remaining 596 papers, 23 ultimately met our inclusion for final review. Results: Intraoperative fractures rates were higher studies of BP-type. Most of the pain or stiffness, malalignments, impingements, cysts were occurred in studies of STAR, HINTEGRA, Agility and Salto. Polyethylene insert fractures were occurred in most studies of STAR. Ten reported postoperative osseous fractures which all resulted from patients used STAR and BP-type. Reoperation rates were higher in studies of STAR, BP-type, Agility and Salto. Arthrodesis rates were lower from HINTEGRA. Arthrodesis rates from STAR, BP-type and Salto were higher than their revision rates. Periprosthetic lucency rates were lower from studies of HINTEGRA. The lucency rates of tibia were higher than talus. Cyst could be more easily observed from studies of STAR, Agility and Salto. All the osteoarthritis were reported in studies of STAR, BP-type and Agility. Conclusion: Currently the complication rates of TAA significantly decrease with modern implants, surgeons experience and patients selection. Some design-specific features of different prostheses were found in our study which could implicate variations in the complications and radiographic findings. We believed that these result could further improve the implant design.

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Bloom, Bryan, MaryEllen Nobe, and Michael Nobe. "Valuing Green Home Designs: A Study of ENERGY STAR® Homes." Journal of Sustainable Real Estate 3, no. 1 (January 1, 2011): 109–26. http://dx.doi.org/10.1080/10835547.2011.12091818.

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Veltri, Alessandro. "Designs for electromagnetic cloaking a three-dimensional arbitrary shaped star-domain." Optics Express 17, no. 22 (October 23, 2009): 20494. http://dx.doi.org/10.1364/oe.17.020494.

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Dominici, Laura, Elena Comino, Fraser Torpy, and Peter Irga. "Vertical Greening Systems: A Critical Comparison of Do-It-Yourself Designs." Plants 11, no. 23 (November 25, 2022): 3230. http://dx.doi.org/10.3390/plants11233230.

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Due to the increasing shortage of space in urban areas, vertical greening systems (VGSs) are becoming increasingly popular as a means to provide increased urban greening using building façades. VGSs are usually installed and managed by experts due to technical complexity, however the role of local communities is becoming increasingly important through Do-It-Yourself (DIY) practices. This study aims to explore low-cost VGSs and provide design suggestions and maintenance indications to encourage the expanded use of in situ small-scale VGSs. Firstly, an exploratory review of VGS designs proposed in the scientific literature, and by commercial and community-based solutions was conducted taking DIY potential into account to define eight basic design models categorized through six structural criteria. Then, seven community garden groups were interviewed to inform a critical comparison of the eight design models. Data collected was synthesized to develop a star rating system, thus providing a quick comparative tool. The star rating system shows the performance of five relevant DIY design parameters for each VGS model. The current research may assist in the accessibility of green technologies and facilitate community-scale implementation of DIY vertical greening.

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G., Saravanan, Shanmugam S., and Veerappan A.R. "Regression rate performance of paraffin wax and bees wax –Gox with varied grain configuration in a hybrid rocket motor." Aircraft Engineering and Aerospace Technology 93, no. 10 (August 12, 2021): 1632–42. http://dx.doi.org/10.1108/aeat-02-2021-0051.

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Purpose This paper aims to determine the regression rate using wax fuels for three different grain configurations and find a suitable grain port design for hybrid rocket application. Design/methodology/approach The design methodology of this work includes different grain port designs and subsequent selection of solid fuels for a suitable hybrid rocket application. A square, a cylindrical and a five-point star grained were designed and prepared using paraffin and beeswax fuels. They were tested in a laboratory-scale rocket with gaseous oxygen to study the effectiveness of solid fuels on these grain structures. The regression rate by static fire testing of these wax fuels was analyzed. Findings Beeswax performance is better than that of paraffin wax fuel for all three designs, and the five-slotted star fuel port grain attained the best performance. Beeswax fuel attained an average regression rate ≈of 1.35 mm/s as a function of oxidizer mass flux Gox ≈ 111.8 kg/m2 s and for paraffin wax 1.199 mm/s at Gox ≈ 121 kg/m2 s with gaseous oxygen. The local regression rates of fuels increased in the range of 0.93–1.194 mm/s at oxidizer mass flux range of 98–131 kg/m2 s for cylindrical grain, 0.99–1.21 mm/s at oxidizer mass flux range of 96–129 kg/m2s for square grain and 1.12–1.35 mm/s at oxidizer mass flux range of 91–126 kg/m2 s for a star grain. A complete set of the regression rate formulas is obtained for all three-grain designs as a function of oxidizer flux rate. Research limitations/implications The experiment has been performed for a lower chamber pressure up to 10 bar. Originality/value Different grain configurations were designed according to the required dimension of the combustion chamber, injector and exhaust nozzle of the design of a lab-scale hybrid rocket, and input parameters were selected and analyzed.

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Etellisi, Ehab A., Mohamed A. Elmansouri, and Dejan S. Filipovic. "Antenna Systems for Simultaneous Transmit and Receive (STAR) Applications." International Symposium on Microelectronics 2017, no. 1 (October 1, 2017): 000590–94. http://dx.doi.org/10.4071/isom-2017-tha41_116.

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Abstract Several novel wideband co-polarized circulator-less monostatic antenna and array designs for co-channel simultaneous transmit and receive (STAR) applications are presented. The monostatic STAR apertures are demonstrated first by utilizing multi-arm spiral antennas where a set of arms is used for transmitting (TX) and the other set for receiving (RX). Then, square and hexagonal broadside STAR arrays utilizing closely-spaced spiral antennas are introduced. Finally, (quasi) omnidirectional circular STAR arrays based on phase modes orthogonality principles are realized using four wideband monocone antenna elements. The studied configurations are integrated with the proper beamforming networks to excite the desired modes of TX/RX operations leading to theoretically infinite isolation between TX and RX ports. Practically, the achieved isolation is limited by the electrical asymmetries of the used components. Overall, consistent wideband operation, high isolation, and decent far-field performance are achieved for all proposed STAR approaches.

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Sommarström, Bo. "The Saami shaman's drum and the star horizons." Scripta Instituti Donneriani Aboensis 14 (January 1, 1991): 136–68. http://dx.doi.org/10.30674/scripta.67201.

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The aim of this contribution is to examine the possible influences of stellar constellations on the positioning of the drum figures on the drums used by the Saami people during the 17th and 18th centuries. Certain of the drum figures seem to have a similar position to corresponding figures on traditional star maps, both with respect to single star constellations and to some members of the Zodiac circle. The most general correspondences between star maps and the painted designs on drums depend on the existence of a cross for determining the four cardinal points in both cases. The star constellations compared here with the drum-figures are in fact peripheral Saami skies. It is hard to believe that they can have played any vital role in their capacity as star symbols within the frame of the Saamis' own astral cosmology. It is more probable that the earthly meanings of most of the figures were more important to the drummer.

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Chien, C. Y., W. H. Chuang, W. C. Tsai, S. C. Lin, Y. P. Luh, and Y. J. Chen. "A Finite Element Study about CAM-Out Failure of the Recess-Screwdriver Interfaces for the Cold-Welded Periarticular Fixation." Journal of Mechanics 29, no. 1 (December 20, 2012): N1—N7. http://dx.doi.org/10.1017/jmech.2012.127.

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ABSTRACTIn clinical practice, cam-out failure at the recess-screwdriver interfaces may occur when tightening or removing a bone screw. For titanium-based periarticular fixation, the literature reports have revealed that cold welding at the plate-screw interfaces makes the screw recess especially prone to cam-out failure during screw removal. In this study, the effects of the four recess shapes (cross, hexagon, star, and crest), three torque value (0.8, 1.0, and 1.2N-m), and the three interfacial misfits (0.00, 0.05, and 0.10mm) on the cam-out failure were numerically evaluated. The free-rotation angle, torque-recess angle, slippage-resisting length, and interfacial stress distribution were defined and chosen as comparison indices for the twelve recess-misfit variations. The results revealed that the interfacial slippage, torque transfer, and stress distribution are highly related to both recess shape and interfacial misfit. The stresses of all recesses and screwdrivers consistently initiate at the contact sites. However, the recess profile significantly affects the stress propagation. The stress patterns of the recess and screwdriver are quite different between the cross-star and hexagon-crest groups. The cross-star group is superior to the hexagon-crest group in terms of the torque-recess angle and slippage-resisting length over. This makes the recess of the cross-star group less stressed than its counterpart. However, the volumes of the cross and the star screwdriver are more highly stressed than the hexagon due to the irregular shape and the thinner flange, respectively. The greater torque and misfit increase the performance difference between the four recess designs. In conclusion, the geometry of the cross and star groups provide the better performance of the screw recess in terms of torque-transferring efficiency and slippage-resisting ability. If the screwdriver material is properly strengthened and the stress-concentrating corners are modified, the cross and star groups would be the optimal designs that protects and extends the lifetime of both recess and reused screwdriver.

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Lee, Jin-Young, Sung-Wook Kim, and You-Chang Jeon. "Study of the Control of Geometric Pattern Using Digital Algorithm (with Focus on Analysis and Application of the Islamic Star Pattern)." Advances in Materials Science and Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/950232.

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This paper presents a study to analyze and modify the Islamic star pattern using digital algorithm, introducing a method to efficiently modify and control classical geometric patterns through experiments and applications of computer algorithms. This will help to overcome the gap between the closeness of classical geometric patterns and the influx of design by digital technology and to lay out a foundation for efficiency and flexibility in developing future designs and material fabrication by promoting better understanding of the various methods for controlling geometric patterns.

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Khan, Mohd Nadeem, and Atal Kumar Rai. "Star Shape Slotted Microstrip Patch Antenna for Wireless Application." International Journal of Advance Research and Innovation 3, no. 1 (2015): 70–73. http://dx.doi.org/10.51976/ijari.311512.

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In this paper three rectangular microstrip patch antennas is designed on the FR4 glass epoxy substrate having the thickness of 1.6 mm. The two antennas contain slots in the form of six corner star. The feeding techniques used in all designs are probe feed. The multiband behavior of printed antennas is analyzed using two slotted structure of rectangular patch antenna. The perposed patch antennas cover the multiband behavior from 1.6 GHz to 6 GHz. The designed antennas are simulated using IE3D electromagnetic simulator. The electrical parameter of the antenna such as return loss, radiation pattern and VSWR exc. are investigated .The simulated antennas is used for wireless application such as IEEE 802.11 (a,b,g and n).

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Nduka, U. C., and P. E. Chigbu. "On The Optimal Choice of Cube and Star Replications in Restricted Second-Order Designs." Communications in Statistics - Theory and Methods 43, no. 19 (August 12, 2013): 4195–214. http://dx.doi.org/10.1080/03610926.2012.725499.

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Miley, George H., and J. Sved. "The IEC star-mode fusion neutron source for NAA — status and next-step designs." Applied Radiation and Isotopes 53, no. 4-5 (November 2000): 779–83. http://dx.doi.org/10.1016/s0969-8043(00)00215-3.

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Rinkenauer, Alexandra C., Stephanie Schubert, Anja Traeger, and Ulrich S. Schubert. "The influence of polymer architecture on in vitro pDNA transfection." Journal of Materials Chemistry B 3, no. 38 (2015): 7477–93. http://dx.doi.org/10.1039/c5tb00782h.

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In the field of polymer-based gene delivery, the tuning potential of polymers by using different architectures like graft- and star-shaped polymers as well as self-assembled block copolymers is immense. In the last years numerous new polymer designs showed enhanced transfections properties in combination with a good biocompatibility.

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Doray, Mathieu, Pierre Petitgas, and Erwan Josse. "A geostatistical method for assessing biomassof tuna aggregations around moored fish aggregating devices with star acoustic surveys." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 6 (June 2008): 1193–205. http://dx.doi.org/10.1139/f08-050.

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Universal kriging was used to model the spatio-temporal variability in the acoustic density of tuna aggregations recorded during star echosounding surveys around moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). The large-scale deterministic drift in the tuna spatial distribution was modeled using an advection–diffusion equation applied to animal grouping. Residuals from the drift were modeled as a random component with small-scale spatial correlation. An estimation variance formula was derived from this deterministic–statistical mixed model to assess the mean precision of density estimates of daytime tuna aggregation. The mean relative error obtained with our star design for daytime surveys was 24%. The methodology was applied to estimate daily maxima of tuna biomass around moored FADs during four monthly sea cruises. The daily peak of tuna biomass aggregated around moored FADs was 9 t on average (standard deviation = 4). Estimation variances for different survey designs were compared for optimizing sampling strategy.

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Rodríguez, Juan C., Julia Barciela, Sagrario García, Carlos Herrero, and Rosa M. Peña. "Optimization of Two Flow-Injection Spectrophotometric Methods for the Determination of Indapamide in Pharmaceutical Dosage Forms." Journal of AOAC INTERNATIONAL 88, no. 4 (July 1, 2005): 1148–54. http://dx.doi.org/10.1093/jaoac/88.4.1148.

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Abstract Multivariate experimental design has been used to optimize 2 flow-injection spectrophotometric methods for the determination of indapamide in pharmaceutical dosage forms, both pure and commercial tablets. The methods are based on the oxidation of this drug with iron (III) in acidic medium and the subsequent formation of an intensive orange-red complex between the liberated iron (II) and 2,2′-bipyridyl or 1,10-phenanthroline reagents. Plackett-Burman designs were applied as a screening method to evaluate the most significant factors with few experiments. Central composite 23+ star designs were performed to evaluate the response surfaces. The methods have been fully validated and were applied successfully to the determination of indapamide in pure and pharmaceutical forms with good accuracy and precision. Therefore, the 2 proposed procedures are simple, inexpensive, and rapid flow methods for the routine determination of indapamide in pharmaceutical preparations.

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Araujo, Pedro W., and Richard G. Brereton. "Visualisation of Confidence in Two-factor Designs Where Model, Replication and Star Points are Varied." Analyst 122, no. 7 (1997): 621–30. http://dx.doi.org/10.1039/a700135e.

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Sarhangi, Reza. "Interlocking Star Polygons in Persian Architecture: The Special Case of the Decagram in Mosaic Designs." Nexus Network Journal 14, no. 2 (June 5, 2012): 345–72. http://dx.doi.org/10.1007/s00004-012-0117-5.

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Islam, Hamidul, Muhammed Bhuiyan, Quddus Tushar, Satheeskumar Navaratnam, and Guomin Zhang. "Effect of Star Rating Improvement of Residential Buildings on Life Cycle Environmental Impacts and Costs." Buildings 12, no. 10 (October 4, 2022): 1605. http://dx.doi.org/10.3390/buildings12101605.

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A diagnostic framework is proposed to assess the influence of star rating improvement for residential buildings on life cycle environmental impacts and life cycle costs (LCEI and LCC) using life cycle assessment (LCA) and life cycle costing methods, respectively, on all life cycle phases (i.e., construction, operation, maintenance, and disposal). A reference house was modified on the basis of six alternative designs to deliver a particular star rating in order to demonstrate the analysis framework. Two LCIA methods (i.e., material flows/add masses and eco-indicator 99 Australian substances) were used to estimate ten LCEI indicators under two categories: seven from problem-oriented (i.e., raw material, air emission, water emission, eco-toxicity, acidification/eutrophication potential, ozone depletion, and climate change) and three from damage-oriented (i.e., resource depletion, ecosystem quality, and effect on human health) categories. The three damage-oriented indicators were combined to evaluate environmental and economic wellbeing on a single eco-point basis. All these combinations of impact indicators can offer three lines of analytical options along with star rating: problem-oriented, damage-oriented, and a variety of problem and damage-oriented LCEIs with LCCs. Hence, the optimum house selection is-based not only on cost or star rating, but also on LCEIs.

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Gladden, Graham P. "Marketing Ocean Travel: Cunard and the White Star Line, 1910–1940." Journal of Transport History 35, no. 1 (June 2014): 57–77. http://dx.doi.org/10.7227/tjth.35.1.5.

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The Cunard shipping line regarded itself as the premier provider of transatlantic passenger transport. As the structure of society on both sides of the Atlantic changed between 1910 and 1940 the company sought to maintain its market amongst the richest of society whilst attracting new passengers from the emerging middle class. Accordingly, Cunard adjusted its marketing in advertisements, brochures, promotional films and ship designs. Two passenger classes, the well-established First Class and the new Tourist Third Class are used to show how the company used all these media to both influence potential passengers' travel decisions and to reassure them of a safe, comfortable voyage in surroundings appropriate to their status, tastes and expectations.

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Zou, Dr Gaolu. "Designing Experimental Classes in College Hotel Management Course: Hedonic Regression Analysis." Global Academic Journal of Humanities and Social Sciences 4, no. 1 (February 11, 2022): 15–18. http://dx.doi.org/10.36348/gajhss.2022.v04i01.003.

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The experimental classes in Hotel Management for university tourism management majors can help students understand and master the fundamental theories and methods of hotel management. Taking hotel prices in Chengdu, China, as an example, this paper designs a course experiment on the impact of hotel star ratings and distance from CBD on prices. Gains are made in the experiments in Hotel Management course teaching. Students have mastered the use of built-in regression programs in Excel and hedonic price models in hotel management analysis. In the experiment, students found that an increase in hotel star ratings will increase hotel prices. With the rise in the distance from the CBD, the price will decrease. These are in line with theoretical expectations. These findings aroused students’ strong interest in learning hotel management courses.

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Murray, K. A., J. J. Corugedo, and N. J. Hoffman. "A Comparison of Li and 83Pb-17Li Primary Coolant Designs for the Pulse*Star ICF Reactor." Fusion Technology 8, no. 1P2B (July 1985): 1901–6. http://dx.doi.org/10.13182/fst85-a40039.

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Jensen, Eva B. Vedel. "ON THE VARIANCE OF LOCAL STEREOLOGICAL VOLUME ESTIMATORS." Image Analysis & Stereology 19, no. 1 (May 3, 2011): 15. http://dx.doi.org/10.5566/ias.v19.p15-18.

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In the present paper, the variance of local stereological volume estimators is studied. For isotropic designs, the variance depends on the shape of the body under study and the choice of reference point. It can be expressed in terms of an equivalent star body. For a collection of triaxial ellipsoids the variance is determined by simulation. The problem of estimating particle size distributions from central sections through the particles is also discussed.

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Siler, Todd. "Fractal Reactor: Re-Creating the Sun." Leonardo 40, no. 3 (June 2007): 270–78. http://dx.doi.org/10.1162/leon.2007.40.3.270.

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The author recounts his quest to design an alternative plasma fusion device that could generate limitless energy through nuclear fusion. The proposed Fractal Reactor is based on fractal geometry rather than the Euclidean geometry used in the designs for the containment systems of plasma fusion devices. Fusion energy systems might become more effective if they more closely embody the geometry and physics of stars, nature's “fractal reactors.” The author aims to work with nature and not against it in controlling the forces that govern burning plasmas. Instead of jamming the square peg of Euclidean geometry into the round hole of fractal geometry, the author considers exerting intense forces on plasmas that approximate the gravitational forces in a star.

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Eom, Kyoung-Hee and 김형주. "A Study on the Development of Textile Designs for Drape Curtains in Rooms of Five-Star Hotels -Focusing on Three Five-star Hotels in South Korea-." Journal of Korea Design Knowledge ll, no. 25 (March 2013): 309–21. http://dx.doi.org/10.17246/jkdk.2013..25.030.

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Nezha, Tlemçani Mekaoui. "Iconic Architecture in Morocco Two Pioneering Cities, Two Singular Towers." Revista Gestão Inovação e Tecnologias 11, no. 4 (July 22, 2021): 2629–47. http://dx.doi.org/10.47059/revistageintec.v11i4.2305.

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In town planning as in architecture, space is a true transcription of civilizational trends, the expression par excellence of civilizations, continues to develop through the spaces they close, the buildings that it includes and that take shape over time. In this sense, Morocco, an emerging country, is beginning to build a modern image for itself, in the face of time by having recourse to its two pioneer cities, Casablanca and Rabat-Salé. In doing so, many spectacular constructions of iconic buildings have emerged there, the work of star architects using designs distinguished by their complex structures and using innovative materials. This article deals with the design of two buildings through the combination of two concepts grouped together in their designs, namely, the singularity of their architectures in relation to their urban environment and their sought-after technological prowess. The choice fell on the CFC tower (Casablanca Finance City) located in the new urban center "Casablanca finance City" and the Bank of Africa tower also called Tour Mohammed IV, located in Bouregreg, emblematic site of the Rabat-Salé conurbation.

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Craig, K. J., D. J. de Kock, and P. Gauche´. "Minimization of Heat Sink Mass Using CFD and Mathematical Optimization." Journal of Electronic Packaging 121, no. 3 (September 1, 1999): 143–47. http://dx.doi.org/10.1115/1.2792676.

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This paper describes the use of CFD and mathematical optimization to minimise heat sink mass given a maximum allowable heat sink temperature, a constant cooling fan power and heat source. Heat sink designers have to consider a number of conflicting parameters. Heat transfer is influenced by, amongst others, heat sink properties (such as surface area), airflow bypass and the location of heat sources, whilst size and/or mass of the heat sink needs to be minimized. This multiparameter problem lends itself naturally to optimization techniques. In this study a commercial CFD code, STAR-CD, is linked to the DYNAMIC-Q method of Snyman. Five design variables are considered for three heat source cases. Optimal designs are obtained within six design iterations. The paper illustrates how mathematical optimization can be used to design compact heat sinks for different types of electronic enclosures.

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Joshua, Andre, and Ni Luh Putu Shinta Eka Setyarini. "EVALUASI KONDISI 1KM RUAS JALAN M.H. THAMRIN MENGGUNAKAN METODE IRAP UNTUK MENCAPAI STAR RATING 4." JMTS: Jurnal Mitra Teknik Sipil 4, no. 1 (March 1, 2021): 81. http://dx.doi.org/10.24912/jmts.v0i0.10508.

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The number of road accidents in Indonesia is very high and continues to increase, one of the causes is that there are still many roads that have not applied specific safety principles in their planning designs. To overcome this, it is necessary to implement a strategy to improve road safety using existing methods. In this study, the IRAP method was used to improve the safety of the M.H. Thamrin to achieve a 4 star rating.From the results of the study, it was found that the existing road segment was very good for vehicle occupant because it had reached a 5 star, it was functional for motorcyclist and bicyclist because it had reached 3 stars, but it was still dangerous for pedestrian because only reaches 2 stars. So it is necessary to do a countermeasure to increase the star rating to 4 stars for all road users. So that we get a final star rating of 5 stars on vehicle occupant and motorcyclist, 4 stars for bicyclist and pedestrian. By calculating BCR, the result is more than 1, which means that the treatment option is feasible to be realized.ABSTRAKJumlah kecelakaan di jalan raya di Indonesia sangatlah tinggi dan terus meningkat, salah satu penyebabnya adalah masih banyaknya ruas jalan yang belum menerapkan prinsip-prinsip keselamatan secara khusus dalam desain perencanaannya. Untuk mengatasi hal tersebut, perlu dilakukan strategi peningkatkan keselamatan jalan menggunakan metode yang ada. Pada penelitian ini digunakan metode IRAP untuk meningkatkan keselamatan ruas jalan M.H. Thamrin untuk mencapai star rating 4. Dari hasil penelitian ditemukan bahwa ruas jalan eksisting sudah sangat bagus bagi moda kendaraan berpenumpang karena sudah mencapai bintang 5, sudah laik fungsi bagi moda sepeda motor dan sepeda karena sudah mencapai bintang 3, namun masih berbahaya bagi pejalan kaki karena hanya mencapai bintang 2. Maka perlu dilakukan countermeasure untuk meningkatkan star rating menjadi bintang 4 pada semua pengguna jalan. Sehingga didapat star rating akhir bintang 5 pada kendaraan berpenumpang dan sepeda motor, bintang 4 pada pesepeda dan pejalan kaki. Melalui perhitungan BCR didapat hasil lebih dari 1, yang berarti opsi penanganan layak untuk di realisasikan.

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Jang, Gwi-sook, Seung-min Lee, and Gee-yong Park. "Suggestion of Design Evaluation Plan based on Star Life Cycle to introduce the Information Minimalism Concept of KOREA Nuclear Plant." EPJ Web of Conferences 170 (2018): 03003. http://dx.doi.org/10.1051/epjconf/201817003003.

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The design of Korea Nuclear Power Plant (NPP) main control rooms (MCR) has been changed to be fully digitalized. Five or six display devices are assigned to each operator in NPP MCR to provide the information of safety parameter and plant status, and various control functions by connecting computerized control devices. Under this circumstance, the distributed displays can induce a dispersion of the operators’ attention and increase the workload while conducting monitoring and control tasks efficiently. In addition, to support human operators to reduce their workload and increase the performance, the concepts of the ecological interface design (EID) and the operator-centered design were applied to the design HMI display. However these designs are applied to a limited set of screens and did not differ largely from the traditional HMI design in that the layout of the information is somewhere similar to P&IDs. In this paper, we propose a design evaluation plan based on star life cycle to introduce the information minimalism concept for designing an HMI display.

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Hu, Fu Xiang. "Architecture of Urban Ecosystem Assessment Based on Data Warehouse." Advanced Materials Research 113-116 (June 2010): 593–97. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.593.

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The assessment architecture is designed in this paper so that the urban ecosystem health can be exactly evaluated. Using data warehouse technology, the writer builds the network to receive every kind of index information, sets the system structure of data warehouse, designs data dimension tables and fact tables. Star model of data warehouse is make up on basis of above all, the assess platform is build. Taking Shanghai city as an example, the results are satisfied, which are consistent with the facts.

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Deshmukh, Amit A., Akshay Doshi, and Anuja A. Odhekar. "Gap‐coupled designs of star shape microstrip antennas for dual band and wide band circular polarized response." International Journal of RF and Microwave Computer-Aided Engineering 29, no. 5 (January 22, 2019): e21664. http://dx.doi.org/10.1002/mmce.21664.

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Bodner, B. Lynn. "From Sultaniyeh to Tashkent Scrolls: Euclidean Constructions of Two Nine- and Twelve-Pointed Interlocking Star Polygon Designs." Nexus Network Journal 14, no. 2 (May 24, 2012): 307–32. http://dx.doi.org/10.1007/s00004-012-0111-y.

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Mahdihassan, S. "Venus, the Goddess of Fertility, Numerologically 15 in Babylon and the Origin of the Chinese System of 8 Designs, Called Pa-Kua." American Journal of Chinese Medicine 15, no. 03n04 (January 1987): 89–97. http://dx.doi.org/10.1142/s0192415x87000126.

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In Babylonia, numerology was invented and Venus, as the goddness of fertility, was first depicted as a 6-comered star. But, as numerologically she was designated 15. As a -comered star, its make-up shows two opposite triangles interpenetrated. This was changed to two squares fused into one where geometrically the shape became a square. It created 9 cells which were so numbered that the numbers counted in any row gave the sum 15. Venus thus became a Magic Square of 15. Geometrically it was a Magic Square, but numerologically it was 15. In the make-up the squares were two and opposites. As goddness of fertility she especially helped the pregnant to an easy delivery. Some 8 variants of the Magic Square, with different arrangements of numbers, represented 4 cosmic elements and 4 cosmic qualities. The Magic Squares, which represented elements, had the numbers 1, 3, 5 and 8 near one another forming a miniature square by themseleves. A Magic Square representing a quality did not have the numbers 1, 3, 5 and 8, as a consolidated unit. This explains the importance of the numbers 1, 3, 5 and 8, a mystery which had remained unsolved. Venus was also the star of copper. When copper technology migrated from Babylon to China, the occult science associated with Venus also rached China. Here the 8 Magic Squares were translated into a system of whole and broken lines, called Pa-Kua, meaning 8 designs. An illustratio is offered showing that, given 3 lines are whole and 3 as broken and these combined with each other, the total result of combinations amounts only to 8. Figuure 10 is then best integrated with the help of Figure 7. Now each Magic Square and each Kua was a "living being" and thereby a source of blessing others. A candidate of longevity wears a robe decorated with Pa-Kua, the 8 designs which further carry at the center the symbol of Yang-Yin, the source of all existence, including those of the 8 kuas themselves. Such a robe of a Taoist priest has also been offered. Incidentially it may be mentioned that the interested reader may consult a previous article on Indian and Chinese cosmic elements (1979).

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Pirrie, Paul, David Campos-Gaona, and Olimpo Anaya-Lara. "Comparison of electrical collection topologies for multi-rotor wind turbines." Wind Energy Science 5, no. 4 (October 1, 2020): 1237–52. http://dx.doi.org/10.5194/wes-5-1237-2020.

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Abstract. Multi-rotor wind turbines (MRWTs) have been suggested in the literature as a solution to achieving wind turbine systems with capacities greater than 10 MW. MRWTs utilize a large number of small rotors connected to one support structure instead of one large rotor with the aim of circumventing the square cube law. Potential benefits of MRWTs include cost and material savings, standardization of parts, increased control possibilities, and improved logistics for assembly and maintenance. Almost all previous work has focused on mechanical and aerodynamic feasibility, with almost no attention being paid to the electrical systems. In this research eight different topologies of the electrical collection network for MRWTs are analysed to assess which are the most economically and practically viable options. AC and DC collection networks are presented in radial, star, cluster and DC series topologies. Mass, capital cost and losses are estimated based on scaling relationships from the academic literature and up-to-date commercial data. The focus of this study is the assessment of the type of electrical collector topology, so component type and voltage level are kept consistent between topology designs in order to facilitate a fair comparison. Topologies are compared in terms of four main criteria: capital cost, cost effectiveness, total mass and reliability. A comparison table is presented to summarize the findings of the research in a convenient way. It is found that the most cost-effective solutions are the AC radial and AC star topologies, with the least cost-effective being the DC series–parallel and DC cluster topologies. This is due to the high cost of DC–DC converters and DC switchgear along with the lower efficiency of DC converters. Radial designs perform best in terms of efficiency and annual energy capture. DC systems achieve a slightly lower nacelle mass compared to their equivalent AC systems. DC topologies are generally found to be more expensive when compared to their AC counterparts due to the high cost of DC–DC converters and DC switchgear. Star topologies are considered to have the best reliability due to having no shared equipment. The most suitable collection topology for MRWTs is shown to be of the star type, in which each turbine is connected to the step-up transformer via its own cable.

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Jumah, Lucy, and Rita Nthiga. "Relationship between Behavioural Empowerment and Employee Commitment in selected Star Rated Hotels in Kisumu City, Kenya." Human Resource and Leadership Journal 7, no. 2 (September 10, 2022): 49–66. http://dx.doi.org/10.47941/hrlj.1030.

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Purpose: The objective of this study was to determine the relationship between behavioural empowerment and employee commitment in selected star-rated Hotels in Kisumu City, Kenya. This study was anchored on Social Cognitive Theory. Methodology: The study adopted explanatory and descriptive research designs. The target population was 1372 non-managerial employees and 130 managerial employees from 34 star rated hotels. A sample size of 310 non-managerial employees and 13 management staff formed the sample for the study. The respondents were selected using stratified and simple random sampling techniques. Questionnaires and interview schedule were used to collect data. The validity of the surveys was established using professional judgment. The dependability of the research tool was assessed using Cronbach's Alpha Coefficient. Both descriptive and inferential statistics were used to analyze the data. Mean, frequencies, and standard deviation were included in descriptive statistics, whereas linear regression was part of inferential statistics and data presented using tables. Findings: According to the study's findings, employee commitment and behavioral empowerment were significantly positively correlated in a few star-rated hotels (1=0.751; p0.05). Unique Contribution to theory, practice and policy: The study came to the conclusion that, in particular hotels, behavioural empowerment had a substantial impact on employees' engagement. Encourage hotel staff to have confidence in their sense of judgment, values, work roles, and actions related to their jobs.

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Akampumuza, Obed, Huilin Xu, Jian Xiong, Hongnan Zhang, Zhenzhen Quan, and Xiaohong Qin. "Analyzing the effect of nanofiber orientation on membrane filtration properties with the progressive increase in its thickness: a numerical and experimental approach." Textile Research Journal 90, no. 1 (June 17, 2019): 24–36. http://dx.doi.org/10.1177/0040517519855316.

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One of the merits of modeling is that the computer-generated data is used in optimizing equipment and experimental designs, eliminating the costs associated with scaling up by experimentation. In this work, the filtration performance of nanofibers aligned diversely within virtual webs was numerically analyzed using Star CCM + and Ansys Fluent software. This knowledge was then used to fabricate two distinctly oriented nanofiber membranes via free surface electrospinning. Their filtration performance was studied by capillary flow porometry technology using POROLUX™ 100. The results of this were in agreement with the simulation work.

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Manua, Dewi Lanny, Astrid Kusumowidagdo, and Stephanus Evert Indrawan. "ARSITEKTUR INTERIOR HOTEL SIGNATURE DI BALI." KREASI 2, no. 1 (April 11, 2017): 73–92. http://dx.doi.org/10.37715/kreasi.v2i1.265.

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Dewsign Interior is an interior design consultant that focus on hotel and hospitality design project. Lead by the founder herself, Dewi Lanny Manua, Dewsign Interior with the help pf experienced staffs are ready to make the best interior and hotel designs that meet the clients expectation. Located in Surabaya, Dewsign Interior provide service to all across Indonesia. Currently Dewsign Interior is working on design project of Signature hotel, Bali. Signature hotel is a three star hotel located at Intan Permai street, Gang Berlian Kerobokan, Badung, Bali. The total land area of this hotel is 2000 m2, with 705 m2 will be designed by Dewsign Interior. With tropical concept and using natural material, this hotel plan to give warm and comfort feelings for all the guests. Dewsign Interior choose the tropical signature concept for this hotel, which is combination from natural material (palimanan stone, jati wood and merbau wood) and the other combination is the shape of the hotel’s logo (celtic maze).

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Clough, T., K. Bodo, H. Majeed, J. Davenport, and M. Karski. "Survivorship and long-term outcome of a consecutive series of 200 Scandinavian Total Ankle Replacement (STAR) implants." Bone & Joint Journal 101-B, no. 1 (January 2019): 47–54. http://dx.doi.org/10.1302/0301-620x.101b1.bjj-2018-0801.r1.

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AimsWe report the long-term clinical and radiological outcomes of a consecutive series of 200 total ankle arthroplasties (TAAs, 184 patients) at a single centre using the Scandinavian Total Ankle Replacement (STAR) implants.Patients and MethodsBetween November 1993 and February 2000, 200 consecutive STAR prostheses were implanted in 184 patients by a single surgeon. Demographic and clinical data were collected prospectively and the last available status was recorded for further survival analysis. All surviving patients underwent regular clinical and radiological review. Pain and function were assessed using the American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot scoring system. The principal endpoint of the study was failure of the implant requiring revision of one or all of the components. Kaplan–Meier survival curves were generated with 95% confidence intervals and the rate of failure calculated for each year.ResultsA total of 84 patients (87 ankles) were alive by the end of this study. Of the surviving 84 patients (87 ankles; rheumatoid arthritis (RA), n = 40; OA, n = 47), 45 were women and 39 were men, with a mean age of 54 years (18 to 72 years) at the time of surgery. A total of 32 implants failed (16%), requiring revision surgery. The mean time to revision was 80 months (2 to 257). The implant survival at 15.8 years, using revision as an endpoint, was 76.16% (95% confidence interval (CI) 64.41 to 87.91). We found a steady but low decrease in survival over the study period. The mean AOFAS score improved from 28 (10 to 52) preoperatively to 61 (20 to 90) at long-term follow-up.ConclusionSTAR prostheses in the United Kingdom have now been largely superseded by newer design TAAs, potentially with improved characteristics and surgical techniques. The long-term survivorship for the STAR prosthesis can provide a benchmark for these later designs of ankle arthroplasty.

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Żywiołek, Justyna, Elena Roxana Tucmeanu, Alin Iulian Tucmeanu, Nicoleta Isac, and Zahid Yousaf. "Nexus of Transformational Leadership, Employee Adaptiveness, Knowledge Sharing, and Employee Creativity." Sustainability 14, no. 18 (September 15, 2022): 11607. http://dx.doi.org/10.3390/su141811607.

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The survival of an organization in the contemporary competitive and dynamic global business environment is associated with its creative workforce. This study explores the impact of transformational leadership (TL) and employee adaptiveness on workforce creativity. The mediating role of employee adaptiveness and the moderating role of knowledge sharing has also been tested. A simple random sampling technique was used to collect data from the 561 employees working in three star and five star hotels. Statistical techniques such as correlation and hierarchical regressions were used for testing hypotheses. To test the mediation effect, we used the statistical procedure suggested by Preacher and Hayes. The results revealed that employee creativity is initiated through TL in hotels and TL positively affects employee adaptiveness. The results of the mediating analysis confirmed the mediating role of employee adaptiveness between TL and creativity link in the context of hotel industry operating in developing nations. Moreover, the findings also revealed that knowledge sharing plays key role for TL and employee adaptiveness links. In this study, quantitative research design was utilized, and the cross-sectional method was used for data collection. Future research designs can be based on both quantitative and current qualitative analyses. The current model can be enriched using factors such as knowledge management systems, organizational structures, and digital platforms in the future.

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Epple, Philipp, Michael Steppert, and Michael Steber. "CFD Optimized Test Rig Design for High Precision Energy Efficiency Performance Measurements of Fans for Electronic Cooling." Applied Mechanics and Materials 882 (July 2018): 208–14. http://dx.doi.org/10.4028/www.scientific.net/amm.882.208.

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To measure the energy efficiency performance and the characteristics of electronic cooling fans a high-precision suction side test rig was designed according to the corresponding national DIN and international ISO standards. To evaluate the influence of the test rig design on the precision of the performance measurements of the fan, the complete test rig designs were analyzed in detail with the commercial CFD solver Star-CCM+ from Siemens PLM Software. Since at the test rig the pressure values of the fan are measured indirectly at the test rig chamber and not at the fan itself, the pressure values from the simulation as read out at the test rig chamber and at the fan itself were compared to deliver the required precision of the test rig design. Furthermore, the effect of the baffle plate and the throttle characteristics on the energy efficiency performance measurements of fans for electronic cooling have been analyzed.

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Dutch, Steven I. "Folding n-pointed Stars and Snowflakes." Mathematics Teacher 87, no. 8 (November 1994): 630–37. http://dx.doi.org/10.5951/mt.87.8.0630.

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Creating snowflakes is a popular seasonal activity in many classrooms. My interest in this subject was kindled when my wife asked if I knew any ways to make six-pointed snowflakes. As it happens, I did. I also knew of a method for folding five-pointed stars that did not work, and so I began looking for good ways of folding stars and snowflakes with other numbers of points. The geometric connection with this subject lies in devising simple ways of folding angles with measmes that are rational fractions of 180 degrees; the star or snowflake is created by cutting designs in the folded paper.

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Faiz Paturrahman, Mohamad, Mohd Radzi Abu Mansor, Zambri Harun, and Mohd Anas Mohd Sabri. "Study on the Modification Effect of Side Pot And Diffuser to the Aerodynamics of the F1 IN SCHOOLS Car." International Journal of Engineering & Technology 7, no. 3.17 (August 1, 2018): 123. http://dx.doi.org/10.14419/ijet.v7i3.17.16635.

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The F1 IN SCHOOLS competition was established in 2004 to develop students’ interest towards science, technology, engineering and mathematics (STEM) in the secondary school phase. The application of aerodynamics is one of the important aspects studied during this phase. There are two factors that must be considered in the analysis affecting the aerodynamic performance of the car, namely the maximum velocity of the drag coefficient and the downforce coefficient. The F1 IN SCHOOLS car velocity is mainly related to its aerodynamic design and features. The objective of this paper is to study the effect of different side pot and diffuser designs that are capable of producing a low drag coefficient while maintaining a sufficient downforce coefficient. The simulation study was conducted using CFD STAR CCM+ software. The results will help to produce a miniature car that will meet two important criteria of low drag coefficient and sufficient downforce coefficient.

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Danieli, Piero, Massimo Masi, Andrea Lazzaretto, and Gianluca Carraro. "An engineering approach for the fast simulation of radial inflow turbines with vaneless spiral casing by single-channel CFD models." E3S Web of Conferences 312 (2021): 11003. http://dx.doi.org/10.1051/e3sconf/202131211003.

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The basic RANS-CFD analysis of the simplest radial-inflow turbine configuration is the subject of this paper. An original technique is here proposed to model the effect of the vaneless spiral casing using single-channel CFD calculations and providing an effective alternative to the more complex simulation of the 360-degree domain otherwise required to simulate this turbine configuration. The aim of the paper is to verify the effectiveness of the proposed modelling technique as a reliable engineering approach conceived to support the preliminary design phase of radial-inflow turbines with time-effective CFD calculations. To this end, the open-source CFD code MULTALL has been used to predict the aerodynamic performance of optimal designs of radial-inflow turbines with different specific speed and diameter and working with air as ideal gas. The MULTALL predictions are compared with the corresponding steady-state results obtained by calculations suited to the preliminary assessment of radial turbines designs performed on fully 360-degree turbine domains using the commercial code Star CCM+®. The investigation is conducted on two turbines that are designed in accordance with a widely validated method. The results show that the proposed CFD approach predicts well the trends and values of the aerodynamic performance of both the turbine designs: a 5% overestimation of the performance predicted by the fully 360-degree CFD models was never exceeded. The suggested turbine modelling approach implemented in MULTALL requires a three times lower computation time than the corresponding traditional 360-degree model.

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Fahlstedt, Madelen, Fady Abayazid, Matthew B. Panzer, Antonia Trotta, Wei Zhao, Mazdak Ghajari, Michael D. Gilchrist, et al. "Ranking and Rating Bicycle Helmet Safety Performance in Oblique Impacts Using Eight Different Brain Injury Models." Annals of Biomedical Engineering 49, no. 3 (January 21, 2021): 1097–109. http://dx.doi.org/10.1007/s10439-020-02703-w.

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AbstractBicycle helmets are shown to offer protection against head injuries. Rating methods and test standards are used to evaluate different helmet designs and safety performance. Both strain-based injury criteria obtained from finite element brain injury models and metrics derived from global kinematic responses can be used to evaluate helmet safety performance. Little is known about how different injury models or injury metrics would rank and rate different helmets. The objective of this study was to determine how eight brain models and eight metrics based on global kinematics rank and rate a large number of bicycle helmets (n=17) subjected to oblique impacts. The results showed that the ranking and rating are influenced by the choice of model and metric. Kendall’s tau varied between 0.50 and 0.95 when the ranking was based on maximum principal strain from brain models. One specific helmet was rated as 2-star when using one brain model but as 4-star by another model. This could cause confusion for consumers rather than inform them of the relative safety performance of a helmet. Therefore, we suggest that the biomechanics community should create a norm or recommendation for future ranking and rating methods.

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Journal articles on the topic 'Star designs'

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