Zeitschriftenartikel: „Partial cube“

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Chepoi, Victor, Kolja Knauer und Tilen Marc. „Hypercellular graphs: Partial cubes without Q3− as partial cube minor“. Discrete Mathematics 343, Nr. 4 (April 2020): 111678. http://dx.doi.org/10.1016/j.disc.2019.111678.

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O. Ngonadi, Lilian, und Francis C. Eze. „Some Optimality Variations of Central Composite Designs“. Academic Journal of Applied Mathematical Sciences, Nr. 54 (15.04.2019): 32–42. http://dx.doi.org/10.32861/ajams.54.32.42.

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Some variations of central composite designs (CCD) under complete and partial replications of cube, axial and center points are studied using A, D and G optimality criteria. The results obtained suggest that complete replication of the cube, axial and center points are better than the partial replication of cube, axial and center points under the A and D optimality criteria studied while it varies under G optimality criterion. The partial replication of the cube, axial and center point for all the CCDs studied, the partial replicated cube point is D optimal but varies under A and G optimality criteria.

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O. Ngonadi, Lilian, und Francis C. Eze. „Some Optimality Variations of Central Composite Designs“. Academic Journal of Applied Mathematical Sciences, Nr. 54 (15.04.2019): 32–42. http://dx.doi.org/10.32861/ajams.54.32.42.

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Some variations of central composite designs (CCD) under complete and partial replications of cube, axial and center points are studied using A, D and G optimality criteria. The results obtained suggest that complete replication of the cube, axial and center points are better than the partial replication of cube, axial and center points under the A and D optimality criteria studied while it varies under G optimality criterion. The partial replication of the cube, axial and center point for all the CCDs studied, the partial replicated cube point is D optimal but varies under A and G optimality criteria.

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D, Raghavendra Prasad H., Nagaraj Sitaram, Pavan P. S und Dushyanth V. BABU R. „Economical Concrete Cube Prepared Using Different Types of Nano-Material for Sustainable Construction“. ECS Transactions 107, Nr. 1 (24.04.2022): 10509–17. http://dx.doi.org/10.1149/10701.10509ecst.

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In this research work concrete cube has been prepared by doing partial replacement for cement using nano materials like Multi-Walled Carbon Nano Tubes (MWCNTs), titanium dioxide (TiO2), and copper oxide (CuO) at different percentages like 0.1, 0.25, and 0.5%. Basic test has been done for materials and fresh concrete, followed by compressive strength test for concrete cubes. MWCNT gives more result compare to TiO2 and CuO. Just to reduce cement usage, fly ash has been used by keeping the compressive strength and the amount of nano materials as constant up to 35% of MWCNTs, TiO2, and CuO, with fly ash replaced for cement to obtain the normal strength. Cost analysis has been done to find out the economic efficiency of nano material concrete cube due to which TiO2 with fly ash cost 14.45Rs to prepare single cube, as MWCNTs and CuO with fly ash cost 726.4 and 17.64Rs to prepare single concrete cube. Almost TiO2 cube preparation took 10% reduction for the preparation of concrete cube compare to normal concrete cube has taken 15.96Rs. So we concluded that TiO2 with fly ash nano material concrete is the economical efficient concrete compared to MWCNTs and CuO with fly ash.

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Chellew, Guylaine, und M. A. Persinger. „Women but Not Men Exhibit a Positive Correlation between Complex Partial Epileptic-Like Signs and Tactile-Visual Cross-Modal Matching: Implications for Hemispheric Intercalation“. Perceptual and Motor Skills 78, Nr. 3_suppl (Juni 1994): 1312–14. http://dx.doi.org/10.2466/pms.1994.78.3c.1312.

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16 right-handed men and 19 women were asked to feel various sized wooden cubes with the dominant hand for 2 sec. (without visual feedback) and then to select this cube from a random visual arrangement of cubes (tactile-visual matching) after a brief delay. The accuracy for men and women for this task did not differ significantly; however, the accuracy was significantly correlated ( rho = 0.61) with a history of complex partial epileptic-like signs for the women but not for the men. The results support the hypothesis that elevated scores for complex partial epileptic-like signs in right-handed women enhance their capacity to associate different perceptual domains of the same stimuli because there is elevated activity within the (multimodal) hippo-campal-amygdaloid system (sensory-limbic hyperconnectionism) and the correlative enhanced intercalation between the right and left temporoparietal lobes.

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Lindner, Peter, Sachin Basil John, Christoph Koch und Dan Suciu. „The Moments Method for Approximate Data Cube Queries“. Proceedings of the ACM on Management of Data 2, Nr. 2 (10.05.2024): 1–23. http://dx.doi.org/10.1145/3651147.

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We investigate an approximation algorithm for various aggregate queries on partially materialized data cubes. Data cubes are interpreted as probability distributions, and cuboids from a partial materialization populate the terms of a series expansion of the target query distribution. Unknown terms in the expansion are just assumed to be 0 in order to recover an approximate query result. We identify this method as a variant of related approaches from other fields of science, that is, the Bahadur representation and, more generally, (biased) Fourier expansions of Boolean functions. Existing literature indicates a rich but intricate theoretical landscape. Focusing on the data cube application, we start by investigating worst-case error bounds. We build upon prior work to obtain provably optimal materialization strategies with respect to query workloads. In addition, we propose a new heuristic method governing materialization decisions. Finally, we show that well-approximated queries are guaranteed to have well-approximated roll-ups.

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.K.M, Ms Jayakumari. „Experimental Study on Compressive Strength of the Cement Mortar Cubes with Partial Replacement of Fine Aggregate Using Polyvinyl Chloride (PVC) Plastic“. INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, Nr. 04 (27.04.2024): 1–5. http://dx.doi.org/10.55041/ijsrem31851.

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Mortar is a material that consists of cement and sand with a range of applications in the construction industry. However, the plain mortar materials are usually brittle and often crack and fail more suddenly than reinforced mortar. This experimental study is about the compressive strength of cement mortar stabilised with the use of the polyvinyl chloride (PVC) plastic powder. Generally the compressive strength of cement mortar of mix proportion (1:3) is 33 N/mm² to 53 N/mm² has been obtained after 28 days curing. The cement mortar ratio is 1: 3 respectively. The PVC powder is added along with the sand with percentages of 0%, 2.5%, 5%, 7.5%, 10% respectively. And the water cement ratio is 0.5 with volume. The moulds of 70×70×70 mm size were used for the cube test, and the cubes were tested on the Compressive testing machine to determine the strength of cube for 3, 7, 28 days of time period respectively. The main aim of f this study to determine the compressive strength of cement mortar (1:3) of sand added with PVC powder, Key Words:- Waste Plastic, Polyvinyl Chloride, Compressive Strength, Mortar.

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Balpande, Ajinkya. „An Experimental Study on Partial Replacement of GGBS with Cement and Utilizing Demolished Coarse Aggregate in Concrete“. International Journal for Research in Applied Science and Engineering Technology 11, Nr. 6 (30.06.2023): 41–47. http://dx.doi.org/10.22214/ijraset.2023.53608.

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bstract: The majority of municipal solid wastes are made up of debris from construction and demolition projects, including recycled construction aggregate (RCA). This paper presents the findings of an experimental and analytical examination of the creation of environmentally friendly concrete. It is a good idea to replace natural material with aggregate from old, demolished structures to reduce debris and preserve the environment. To reduce consumption, recycled aggregate can be utilized in place of natural aggregate. To address these issues, an attempt is undertaken in the current experimental work to substitute GGBS in varied proportions for cement. The purpose of this research is to demonstrate the findings of an investigation into the applicability of GGBS in the manufacturing of concrete by using construction and demolition debris as a recycled resource. Ground granulated blast furnace slag (GGBS) and recycled concrete aggregates are the recycled materials employed in this study. A concrete mix of grade M25 was created through the mix design process. GGBS was partially replaced with wastedestroyed aggregate in the amounts of 0, 10, 20, 30, and 40% to create the mixes. Cubes of 150x150x150mm3 were poured. The compressive strength of the concrete cube specimens was measured by smashing the cube after 7, 14, 28, 60, and 90 days of curing for various curing intervals. The compression test results on the cubes show that strength increases with the amount of slag added up to the maximum value. Compressive strength was seen to grow when GGBS content increased up to 30%, but after the replacement level was above 30%, strength began to deteriorate. The outcomes of GGBS with conventional concrete and concrete made entirely of demolished aggregate without GGBS are compared to the outcomes of GGBS with concrete containing demolished aggregate

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Sturtevant, Nathan, Ariel Felner und Malte Helmert. „Exploiting the Rubik's Cube 12-Edge PDB by Combining Partial Pattern Databases and Bloom Filters“. Proceedings of the International Symposium on Combinatorial Search 5, Nr. 1 (01.09.2021): 175–83. http://dx.doi.org/10.1609/socs.v5i1.18332.

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Pattern Databases (PDBs) are a common form of abstraction-based heuristic whichare often compressed so that a large PDB can fit inmemory. Partial Pattern Databases (PPDBs) achieve this by storing only layersof the PDB which are close to the goal. This paper studies the problem of howto best compress and use the 457 GB 12-edge Rubik's cube PDB, suggesting anumber of ways that Bloom filters can be used to effectively compress PPDBs. Wethen develop a theoretical model of the common min compression approach and ourBloom filters, showing that the original method of compressed PPDBs can neverbe better than min compression. We conclude with experimental results showingthat Bloom filter compression of PPDBs provides superior performance to mincompression in Rubik's cube.

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Kobayashi, Masakazu, Yoshimasa Takayama, Hajime Kato und Hiroyuki Toda. „In-Situ SEM/EBSP Analysis during Annealing in a Pure Aluminum Foil for Capacitor“. Materials Science Forum 539-543 (März 2007): 362–67. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.362.

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In-situ SEM/EBSP analysis has been performed during the evolution of the cube texture in a pure aluminum foil. In general, foils for capacitor are manufactured in an industrial process of casting, homogenizing, hot rolling, cold rolling (CR), partial annealing (PA), additional rolling (AR) and final annealing (FA). The foil samples after CR or AR in the process were analyzed by the SEM/EBSP technique at a constant temperature which was step-heated repeatedly by 10-20K from a room temperature to 623K or 598K. In a CRed sample, cube ({001}<100>) grains begin to grow preferentially at 503K to cover the sample. On the other hand, in a sample subjected to PA at 503K and AR, cube grains coarsened rapidly and preferentially at more than 533K in contrast to other oriented small grains remaining their sizes. Further, intragranular misorientation analysis revealed that the misorientation, which corresponds to dislocation density or strain, was much smaller in cube grains than in S ({123}<634>) and Cu ({112}<111>) ones.

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Nwankwo, P. O., U. N. Wilson und Z. Danbuba. „THE FIRE RESISTANCE OF CONCRETE MADE WITH RECYCLED PLASTIC AS PARTIAL REPLACEMENT FOR COARSE AGGREGATE“. Malaysian Journal of Civil Engineering 34, Nr. 2 (27.07.2022): 11–18. http://dx.doi.org/10.11113/mjce.v34.18309.

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This research is aimed to investigate the fire resistance of recycled discarded plastic when used as partial replacement for normal granite coarse aggregate in concrete when exposed to elevated temperatures. Discarded Polyethylene Terephthalate (PET) bottles were cut into a maximum size of 20mm to produce Recycled Plastic Aggregate (RPA). The replacement of normal aggregates with RPA were in proportion of 0%, 5%, 10%, 15%, 20%, 25% and 30% by weight of normal coarse aggregate. The compressive performance of the concrete made with RPA were studied by casting three 100 mm cubes for each of the percentage replacements and tested at 7, 14 and 28 days of curing age. A set of three (3) concrete cubes for each percentage replacement was cured for 28 days and subjected to a temperature of 718oC for a duration of 15 minutes in a furnace. Results of slump tests on fresh concrete showed that workability decreased with increase in RPA. Densities and compressive strengths for normal cube samples not subjected to elevated temperatures and the sample subjected to temperature of 718oC increased with increase in curing age and decreased with increase in percentage of RPA. The result showed that the concrete specimen with 10% replacement of RPA was optimum for good thermal stability.

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Nguyen, Thi-Thuy-Hang, Hong-Ha Mai, Duc-Hung Phan und Duy-Liem Nguyen. „Responses of Concrete Using Steel Slag as Coarse Aggregate Replacement under Splitting and Flexure“. Sustainability 12, Nr. 12 (16.06.2020): 4913. http://dx.doi.org/10.3390/su12124913.

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Experimental tests were performed to investigate the responses of coarse steel slag concrete under splitting and flexure. The name of coarse steel slag concrete (CSC) here refers to concrete using industrial byproduct steel slag as natural coarse aggregate replacement. Three CSC types were examined in this investigation as follows: CSC1, CSC2, and CSC3, having a water/cement ratio of 0.57, 0.50, and 0.45, respectively. In the compositions of the three studied CSCs, the water content by weight remained constant and other partial materials were changed, but the ratio of coarse steel slag/fine river sand was still fixed. Under splitting, three types of test methods were conducted including a cylinder splitting test, side-cube splitting test, and diagonal-cube splitting with the same sizes: the diameter of the cylinder and side of the cube were 100 mm. The orders of splitting test methods were observed for CSC2 as follows: cylinder > side-cube > diagonal-cube in terms of maximum applied load, and, cylinder > diagonal-cube > side-cube in terms of splitting strength. Additionally, there were clear size effects on the splitting strengths of CSC2 with different sizes as follows: 70 mm, 100 mm, 150 mm for cylindrical diameter, and/or cubic side. Under flexure, there was a strong co-relationship between compressive strength and flexural resistance of CSCs. The flexural engineering parameters were examined then assessed for plain CSCs, using a rectangular prism with the size of 100 × 100 × 300 mm (width × height × span-length), and, for steel-reinforced beams using CSCs with the size of 200 × 300 × 3000 mm (width × height × span-length).

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Huda Suliman, Nurul, Amir Atif Abdul Razak, Hazrina Mansor, Anizahyati Alisibramulisi und Norliyati Mohd Amin. „Concrete using sawdust as partial replacement of sand : Is it strong and does not endanger health?“ MATEC Web of Conferences 258 (2019): 01015. http://dx.doi.org/10.1051/matecconf/201925801015.

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This study was conducted to investigate the effectiveness of concrete using sawdust to partially replace the river sand which could reduce both environmental problems and construction cost. In this study, sawdust concrete has been produced where the river sand is replaced with sawdust by 5%, 10% and 15% of the total sand volume. Both wet concrete and hardened concrete (cubes specimens) were tested through material testing and cube testing to obtain the most optimum sawdust concrete design. In addition, specimens have also been tested in environmental laboratory to identify the extent of hazardous use of sawdust to consumer health. This is because the dust used is the waste taken from the unknown root of the level of cleanliness. The result shows that the most optimum design for producing sawdust concrete is that with 10% replacement of river sand. The result is based on the compressive strength obtained. The results of environmental study also show that this sawdust concrete is free from any harmful to health contaminants.

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Jafri, N., M. I. F. Rosli, K. D. A. Ghani, A. Abdul Aziz, N. Zakaria und S. Sharih Md Zahir. „Determination on The Optimum Percentage of Rubberized Engineered Cementitious Composite (RECC) as Fine Aggregate Replacement in Mortar“. IOP Conference Series: Earth and Environmental Science 1135, Nr. 1 (01.01.2023): 012046. http://dx.doi.org/10.1088/1755-1315/1135/1/012046.

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Abstract This study aims to determine the optimal percentage of Rubberized Engineered Cementitious Composite (RECC) as fine aggregate replacement in mortar. Various percentages of crumb rubber with 0%, 5%, 10%, 15%, and 20% are used as a partial replacement of fine aggregate. The mortar was subjected to a compressive strength test to evaluate crumb rubber strength performance with varying percentages. The mortar specimen was examined to determine the optimal percentages of Engineered Cementitious Composite (ECC) containing variable percentages of crumb rubber as a partial fine aggregate replacement for 7, 14, and 28 days. The compressive strength test was used until the ECC failed. This study has been carried out using 54 sample mortar cubes with 50 mm cube specimen sizes. As a result, of increased crumb rubber addition into ECC, the compressive strength was significantly reduced, which could be attributed to the low stiffness of crumb rubber and the expanded closing pores in the cement paste. The performance of RECC as a mortar improves in terms of energy dissipation and ductility as used in the compressive strength test. The optimal percentage of crumb rubber as replacement partial fine aggregate is 5%.

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Gunarani, G. I., B. Karthikeyan, A. Priyadharshini, Senthil Kumaran Selvaraj, S. Jose, D. Vincent Herald Wilson und Tezeta Moges Adane. „Sustainable Concrete Columns with GGBS and Industrial Sand: A Comparative Study on Destructive and Nondestructive Tests on Damaged Columns Strengthened with GFRP Jacketing“. Advances in Civil Engineering 2022 (10.09.2022): 1–11. http://dx.doi.org/10.1155/2022/6716511.

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This paper presents the experimental investigation of the load-resisting characteristics of damaged columns repaired with glass reinforced polymer (GFRP) jacketing. The high-strength columns were made with ground granulated blast furnace slag (GGBS) used at 15%, 25%, and 35% as a partial substitute for cement. Cube specimens of size 100 mm × 100 mm × 100 mm and columns of size 600 mm × 120 mm were cast to perform the study. Considering the practical difficulties in the construction field in obtaining river sand, industrial sand was used for making the specimens eco-friendly. On completion of the prescribed curing period of 28 days, the cube specimens were subjected to a compression test to ensure the grade of the mix design, and the column specimens were subjected to axial loading and were tested in two categories, with and without wrapping of GFRP sheets’ split tensile strength. Compression tests on cubes and columns were done. The nondestructive test was also performed with the ultrasonic pulse velocity (UPV) method to check the dense nature of the concrete before and after wrapping with GFRP. On comparing the results, it was observed that it is possible to obtain a higher strength using industrial sand when supported with suitable admixtures and strengthening processes.

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Lee, Kyoung Jin, und Richard L. Gibson. „An improved mesh generation scheme for the wavefront construction method“. GEOPHYSICS 72, Nr. 1 (Januar 2007): T1—T8. http://dx.doi.org/10.1190/1.2399366.

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Wavefront construction is an effective tool for the rapid calculation of ray fields in anisotropic media. The method explicitly tracks the propagation of a wavefront through a model, mapping it to a computational mesh that is interpolated when accuracy criteria based on paraxial ray methods are violated. Takeoff angles are used often to define the initial ray directions, but uniform sampling in the two angles leads to oversampling of the ray field in the direction of the axis. Such sampling can lead also to numerical instability associated with vanishing derivatives with respect to the azimuthal angle. We suggest a new wavefront mesh definition using the cubed-sphere mesh, which is a coordinate system used to solve partial differential equations in spherical geometries. When using this mesh, ray directions are assigned by mapping points on a regular discretization of the faces of a cube surrounding the source to corresponding rays. This scheme produces a nearly uniform distribution of rays with minimal effort and using the cubed-sphere coordinates as ray parameters to calculate partial derivatives completely eliminates the singularities that arise when takeoff angles are used as ray parameters. Numerical results for quantities related to seismic amplitudes confirm that this new mesh does provide more stable and reliable results.

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Sager, Valeska F., Merete B. Munk, Mikka Stenholdt Hansen, Wender L. P. Bredie und Lilia Ahrné. „Formulation of Heat-Induced Whey Protein Gels for Extrusion-Based 3D Printing“. Foods 10, Nr. 1 (22.12.2020): 8. http://dx.doi.org/10.3390/foods10010008.

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This study investigated the extrusion-based 3D printability of heat-induced whey protein gels as protein rich food inks. In particular, the effects of ionic strength by the addition of NaCl (0–250 mM), protein content (10%, 15%, 20%), fat content (0%, 10%), and partial substitution of whey protein isolate (WPI) with microparticulated whey protein (MWP) or micellar casein isolate (MCI) on printability were assessed. Texture analysis, specifically Young’s modulus, rheological measurements including yield stress, and creep–recovery behavior were used to characterize the gels. Modifications of the formulation in terms of ionic strength, increased protein content, and the formation of emulsion gels were insufficient to maintain a continuous extrusion process or shape stability after printing. However, the substitution of WPI with MWP created more viscoeleastic gels with improved printability and shape retention of the 3D cube structure after deposition. The partial replacement of WPI with MCI led to phase separation and 3D-printed cubes that collapsed after deposition. A narrow range of rheological material properties make WPI and MWP emulsion gels promising food inks for extrusion-based 3D printing.

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Singh, Janhavi, und Shilpa Pal. „Analysis of Blended Concrete Cubes under Impact loading using ANSYS“. IOP Conference Series: Earth and Environmental Science 1084, Nr. 1 (01.10.2022): 012067. http://dx.doi.org/10.1088/1755-1315/1084/1/012067.

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Abstract Blended concretes, with the partial replacement of the cement with secondary cementitious material like fly ash, rice husk ash, GGBS (Ground Granulated Blast Slag), silica fume etc. are gaining a wide range of applications in civil engineering nowadays. The behaviour of concrete structures has been studied by many researchers under different types of loads like impact load, wind load, earthquake load etc. Impact loading analysis has applications like ship impact resistance design for marine structures, impact-resistant structural design against military and terrorist attacks etc. This study aims to perform a FEM analysis of blended concrete cubes under impact load. Deformation and stress response has been obtained from the velocity impact simulations in ANSYS Explicit dynamics module. Parametric analysis has been done by changing the height of the impactor, shape of the impactor, boundary conditions and partial replacement of cement in the blended concrete with different supplementary cementitious material. It is observed that the strength of the blended concrete cube decreases with an increase in height of the impact.

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Othman, Muhammad Lutfi, Noor Nabilah Binti Sarbini, Redzuan Abdullah und Mohamad Salleh Bin Yassin. „Effects of the partial replacements of Oil Palm Boiler Clinker (OPBC) on the density and compressive strength of concrete“. IJEBD (International Journal of Entrepreneurship and Business Development) 5, Nr. 5 (30.09.2022): 992–1002. http://dx.doi.org/10.29138/ijebd.v5i5.2005.

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Purpose: Oil Palm Boiler Clinker (OPBC) is a promising waste material that can be deployed toward sustainable development. Researchers have been looking into the potential of industrial waste and by-products to provide an alternative to natural stone aggregates in concrete production. This study aims to determine an OPBC concrete mix eligible for lightweight reinforced precast concrete products according to BS EN 13369:2013. Design/methodology/approach: The concrete mix design is determined via the trial mix method, where percentages of OPBC are varied as partial replacements in the control mix. Raw OPBC is collected from a local palm oil mill in Johor, Malaysia and is processed to be implemented in the concrete mix. Three 100mm cube samples of nine OPBC mixes and one control mix are tested and weighed on day 1, day 7, and day 28 to determine their cube compressive strength and density to BS EN 12390-3:2009. The mix that fulfils the requirements is the mix with 90% coarse clinker and 90% fine clinker, cured by the method of air curing, which achieved a cube compressive strength of 38.66N/mm2 and density of 1920kg/m3. Findings: In conclusion, the results show that OPBC concrete is a green alternative to standard concrete that does not differ significantly in terms of strength while offering a density reduction of as much as 16%. Originality/value: This paper is original Paper type: Research paper

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Singh, Om Prakash, Mahendra Kr Singar und Sandeep Kumar. „Mathematical Expressions Model to forecast for Chloride Ion Penetration and Comp. Strength of Recycled Coarse Aggregate Concrete Incorporating Meta-kaolin“. IOP Conference Series: Materials Science and Engineering 1224, Nr. 1 (01.01.2022): 012019. http://dx.doi.org/10.1088/1757-899x/1224/1/012019.

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Abstract This research investigates the mathematical modeling of compressive strength (CS) of concrete cured cube at 3, 7 & 28 days and chloride penetration resistance of cylindrical concrete specimens cured at 28 days incorporating of Meta-kaolin (MK). The experimental data results were shown various concrete specimens close to recognize compressive strength (CS) and penetration of chloride ion. Ordinary Portland cement (OPC) has been partial replacement of 0%, 5%, 8%, 12%, 16%, 18% and 20% by Meta-kaolin (MK). Compressive strength (CS) results discover through the cubes and rapid chloride penetration test (RCPT) presented. Two predictive regression models established, first for compressive strength (CS) of concrete specimen at the days of 3, 7, and 28 and second for charge passed Q at 28 days. To predictive the mathematical models have been established and have good precision, correlation by experimental results of data.

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Almaamari, Janat, Rahma Al Fahdi, Fatma alzahraa Al Jabri und Sachin Kuckian. „Investigation on Mechanical Properties of Concrete by replacing palm Ash and fine seashell powder as Partial Cement replacement“. IOP Conference Series: Materials Science and Engineering 1282, Nr. 1 (01.10.2023): 012010. http://dx.doi.org/10.1088/1757-899x/1282/1/012010.

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Abstract Manufacturing cement causes harm to the environment due to Co2 emissions. CO2 emission by the industry could be reduced by recycling natural waste materials such as palm ash and seashell powder; since seashell has 95% of calcium carbonate and palm ash can improve the mechanical properties. 15 cube, 3 beams were subjected to several tests to find the mechanical characteristics in a certain period. The tests were compression strength test, flexural test, workability, SEM tests, and sieving analysis. Thebeam dimensions measurements are 150mm*150mm*650mm, and 150mm*150mm*150mm for cubes. OPC was the main finding of compression strength which gained the highest strength, but in 28 days 25% of cement replacement gained 31.7Mpa when compared with other specimens. On the other hand, OPC and 5% of partial cement replacement were classified as high workability. In addition, flexural strength test showed that 15% of cement replacement achieved the highest strength compared with other specimens. SEM test showed the surface texture of PA and SP affect the hydration, therefore it will affect the strength of concrete.

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Shakeel, Namra, und Tahir Mehmood. „Inverse Matrix Problem in Regression for High-Dimensional Data Sets“. Mathematical Problems in Engineering 2023 (23.02.2023): 1–8. http://dx.doi.org/10.1155/2023/2308541.

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Forhigh-dimensional chemometric data, the inverse matrix X t X − 1 problem in regression models is a difficulty. Multicollinearity and identification result from the inverse matrix problem. The usage of the least absolute shrinkage and selection operator (LASSO) and partial least squares are two existing ways of dealing with the inverse matrix problem (PLS). For regressing the chemometric data sets, we used extended inverse and beta cube regression. The existing and proposed methods are compared over near-infrared spectra of biscuit dough and Raman spectra analysis of contents of polyunsaturated fatty acids (PUFA). For reliable estimation, Monte Carlo cross-validation has been used. The proposed methods outperform based on the root mean square error, indicating that cube regression and inverse regression are reliable and can be used for diverse high-dimensional data sets.

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Ikeda, Kenichi, Naoki Takata, Fusahito Yoshida, H. Nakashima und Hiroshi Abe. „Influence of Partial Annealing Temperature on Cube Texture in High Purity Aluminum Foils“. Materials Science Forum 396-402 (Juli 2002): 569–74. http://dx.doi.org/10.4028/www.scientific.net/msf.396-402.569.

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Liu, X. B., und I. C. Nlebedim. „Phase stability and coercivity in La₂Fe₁₄B magnet“. AIP Advances 13, Nr. 2 (01.02.2023): 025211. http://dx.doi.org/10.1063/9.0000403.

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Critical rare-earth free La2Fe14B (2:14:1) has the potential to be a gap permanent magnet. However, La2Fe14B decomposes into La, α-Fe, and LaFe4B4 phases below 1067 K. The phase stability and coercivity have been studied in La2Fe14B magnet using first principles DFT (density functional theory) calculation and micromagnetic simulation. For a perfect La2Fe14 B cube (edge length of 256 nm) without any structural defects and soft magnetic secondary phases, the coercivity (8.5 kOe) is reduced to ∼40% of its magnetocrystalline anisotropy field ( H A = 20 kOe). Further, the coercivity sharply reduces to 3.2 kOe upon forming a thin layer (2 nm) of α-Fe on the surface of the La2Fe14B cube particle. The DFT calculations indicate that a partial replacement of La by other rare-earth (RE) elements can enhance the structural stability of 2:14:1. The gains in cohesive energy are 0.75, 0.10, and 0.33 eV per formula unit in (La0.5RE0.5)2Fe14B with RE = Ce, Pr, and Nd, respectively. Stabilizing the 2:14:1 structure and mitigating the formation of soft magnetic structural defects or impurity phases such as α-Fe is necessary to develop La2Fe14B based magnet, which can be moderately achieved via partial substitution of La by other rare earth elements such as Ce, Pr, and Nd.

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Li, Furong, Guoxing Chen und Hui Long. „An Experimental Study Examining the Size Effect on the Compressive Dynamic Performance of Nuclear Power Containment Concrete“. Advances in Materials Science and Engineering 2020 (06.05.2020): 1–11. http://dx.doi.org/10.1155/2020/7582862.

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To study the size effect of nuclear power containment concrete (NPCC) under compressive dynamic performance, the cube concrete specimens with 3 different cube sizes were measured at 10 different loading strain rates using a hydraulic servo, and the failure mode and compressive strength of NPCC were compared and analyzed under different loading conditions. Based on the comparative analysis of experiment results, the following conclusions can be drawn: the effect of loading strain rate has caused NPCC to develop from static strain rate, mainly cement cementitious layer damage and uniform distribution of cracks, to dynamic strain rate, where there are partial coarse aggregate failures and oblique cracks as the main crack distribution. Due to the size effect, the integrity of large-scale NPCC specimen after compression failure is relatively high. With the increase of loading strain rate and decrease of cube size, compressive strength of NPCC is gradually increased, and, with the increase of loading strain rate, the size effect on the mechanical properties of NPCC becomes more significant. Moreover, this paper quantitatively analyzes the influence of the coupling effect of strain rate and size effect on the compressive strength of NPCC, and its mechanism is discussed in depth. The research results are of great significance to the safety of nuclear power concrete containment.

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Chuluunbaatar, Galmandakh, Alexander A. Gusev, Ochbadrakh Chuluunbaatar, Vladimir P. Gerdt, Sergue I. Vinitsky, Vladimir L. Derbov, Andrzej Góźdź, Pavel M. Krassovitskiy und Luong Le Hai. „Construction of Multivariate Interpolation Hermite Polynomials for Finite Element Method“. EPJ Web of Conferences 226 (2020): 02007. http://dx.doi.org/10.1051/epjconf/202022602007.

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A new algorithm for constructing multivariate interpolation Hermite polynomials in analytical form in a multidimensional hypercube is presented. These polynomials are determined from a specially constructed set of values of the polynomials themselves and their partial derivatives with continuous derivatives up to a given order on the boundaries of the finite elements. The effciency of the finite element schemes, algor thms and programs is demonstrated by solving the Helmholtz problem for a cube.

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Osanyinlokun, O. E., C. A. Fapohunda und O. M. Olaniyan. „Compressive, bending and shear properties of reinforced concrete beams containing sawdust ash as partial replacement of cement“. Nigerian Journal of Technology 43, Nr. 1 (12.04.2024): 2–13. http://dx.doi.org/10.4314/njt.v43i1.2.

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150x600 mm for the bending test and 150x150x450 mm for the shear test) specimens were used for this investigation. The concrete cube and RC beam specimens had SDA as a partial cement replacement within the range of 0%–10% by weight of cement at 2.5% intervals. 120 RC beam specimens were cast, followed by curing and testing at 28, 60, 90, and 180 days. Using the 4-point loading method, the bending and shear responses of the beams and associated parameters, like the formation and growth of cracks, were determined during the testing. The impact of SDA replacement on the characteristics of fresh and hardened concrete was also assessed using 105 cube specimens cast, cured, and tested at 7, 14, 21, 28, 60, 90, and 180 days. A concrete mix ratio of 1:1.3:2.4 and a constant water/binder ratio of 0.50 at optimum 5% SDA replacement produced (25 N/mm2 ) the required compressive strength. The results show that workability decreases as the SDA percentage increases. Generally, the values of concrete’s densities containing SDA in the mix were in the range of standard weight applications. At 28 days, samples up to 5% recorded a higher compressive, bending, and shear strength development rate than the control mix. The results show that cement partially replaced with up to 5% SDA can produce RC that meets the requirements for concrete for structural application.

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Murakami, Takeshi. „Cube Texture in A3004 Alloy Sheet Processed by Partial Annealing and Light Rolling Method“. Materials Science Forum 331-337 (Mai 2000): 823–28. http://dx.doi.org/10.4028/www.scientific.net/msf.331-337.823.

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29

Eu Jan, Gene, und Ming-Bo Lin. „Concentration, load balancing, partial permutation routing, and superconcentration on cube-connected cycles parallel computers“. Journal of Parallel and Distributed Computing 65, Nr. 12 (Dezember 2005): 1471–82. http://dx.doi.org/10.1016/j.jpdc.2005.04.004.

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30

Bridgman, T., W. Hereman, G. R. W. Quispel und P. H. van der Kamp. „Symbolic Computation of Lax Pairs of Partial Difference Equations using Consistency Around the Cube“. Foundations of Computational Mathematics 13, Nr. 4 (06.10.2012): 517–44. http://dx.doi.org/10.1007/s10208-012-9133-9.

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31

Huang, Beibei, Bin Tu und Benzhuo Lu. „A Fast Direct Solver for a Class of 3-D Elliptic Partial Differential Equation with Variable Coefficient“. Communications in Computational Physics 12, Nr. 4 (Oktober 2012): 1148–62. http://dx.doi.org/10.4208/cicp.101110.061211a.

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AbstractWe propose a direct solver for the three-dimensional Poisson equation with a variable coefficient, and an algorithm to directly solve the associated sparse linear systems that exploits the sparsity pattern of the coefficient matrix. Introducing some appropriate finite difference operators, we derive a second-order scheme for the solver, and then two suitable high-order compact schemes are also discussed. For a cube containing N nodes, the solver requires arithmetic operations and memory to store the necessary information. Its efficiency is illustrated with examples, and the numerical results are analysed.

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Brandt, Christoph, und Frank Hermann. „Conformance Analysis of Organizational Models“. International Journal of Information System Modeling and Design 4, Nr. 1 (Januar 2013): 42–78. http://dx.doi.org/10.4018/jismd.2013010103.

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Organizational models play a key role in today’s enterprise modeling. They usually show up as partial models produced in a distributed and non-synchronized fashion by people with different conceptual understandings. For this reason, there is a major need to organize partial organizational models within a suitable modeling framework, and, moreover, to check their mutual conformance. This builds the basis to integrate the partial organizational models later on into one holistic model of the organization and for model checking certain security, risk, and compliance constraints. In order to attain this goal, the authors present two mutually aligned contributions. The first one is a new enterprise modeling framework—the EM-Cube. The second one is a new approach for checking conformance of models based on the suggested formal modeling technique associated with the proposed framework. They evaluate the potential solution against concrete requirements derived from a real-world scenario coming out of the finance industry.

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Grace Yenin Edwige, Johnson, Adepo Joel und Oumtanaga Souleymane. „A MECHANISM FOR DETECTING PARTIAL INFERENCES IN DATA WAREHOUSES“. International Journal of Advanced Research 9, Nr. 03 (31.03.2021): 369–78. http://dx.doi.org/10.21474/ijar01/12593.

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Data warehouses are widely used in the fields of Big Data and Business Intelligence for statistics on business activity. Their use through multidimensional queries allows to have aggregated results of the data. The confidential nature of certain data leads malicious people to use means of deduction of this information. Among these means are data inference methods. To solve these security problems, the researchers have proposed several solutions based on the architecture of the warehouses, the design phase, the cuboids of a data cube and the materialized views of multidimensional queries. In this work, we propose a mechanism for detecting inference in data warehouses. The objective of this approach is to highlight partial inferences during the execution of a multidimensional OLAP (Online Analytical Processing) SUM-type multidimensional query. The goal is to prevent a data warehouse user from inferring sensitive information for which he or she has no access rights according to the access control policy in force. Our study improves the model proposed by a previous study carried out by Triki, which proposes an approach based on average deviations. The aim is to propose an optimal threshold to better detect inferences. The results we obtain are better compared to the previous study.

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Chandramouli, Dr K., J. Sree Naga Chaitanya und M. Tirupal Babu. „An Experimental Investigation on Steel fiber reinforced concrete with quarry dust as a Partial Replacement of Fine aggregate“. International Journal for Research in Applied Science and Engineering Technology 10, Nr. 8 (31.08.2022): 1522–24. http://dx.doi.org/10.22214/ijraset.2022.46445.

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Abstract: It has been observed that quarry dust performs best when replaced for fine aggregate at a 40 percent level. Strength is greater than that of conventional concrete and begins to diminish at 60%. When replacing sand with quarry dust, the measurable compressive strength was utilised to establish the proportion and type of concrete employed. In the experimental study, quarry dust is utilised in percentages of 0%, 20%, 40%, and 60% in place of natural sand. Hook-end steel fibres made about 0.5% to 0.75% of the concrete's volume. Following tests on cube and cylinder specimens, it was discovered that 40% quarry dust increased strength.

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Rathna Chary, Mudigonda, Kotha Hima Bindu, Jagadish Shrisaila Haranatti, Mohnika Samineni, Pasupuleti Pavani und Oleg Igorevich Rozhdestvenskiy. „The Properties of Geo-polymer Concrete by Partial Replacement of Cement with GGBS & Fly ash“. MATEC Web of Conferences 392 (2024): 01006. http://dx.doi.org/10.1051/matecconf/202439201006.

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The production of Portland cement contributes to significant environmental pollution, with around 7% of global carbon dioxide emissions attributed to this industry. To address this issue, the construction sector seeks eco-friendly alternatives to conventional concrete. This project focuses on geopolymer concrete, which utilizes Fly ash and ground granulated blast-furnace slag (GGBS) can be utilized as a partial substitute for cement. The study investigates the effects of incorporating different percentages of fly ash (5%, 10%, 15%, 20%, and 25% as cement replacement) and GGBS (10%, 15%, 20%, 25%, and 30% as sand replacement) in geopolymer concrete. Compressive strength tests are conducted on cube specimens (150mm x 150mm x 150mm) at various ages (7 days, 14 days, and 28 days).

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Elangovan, G., und V. M. Rajanandhini. „EXPERIMENTAL STUDY AND SEM ANALYSIS ON MORTAR CUBE WITH WOOD ASH FOR PARTIAL REPLACEENT OF CEMENT“. International Journal of Engineering Technologies and Management Research 5, Nr. 3 (15.02.2020): 263–69. http://dx.doi.org/10.29121/ijetmr.v5.i3.2018.200.

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In the present view, several buildings are constructed ranging from ordinary residential building to sky - scrap structures. Invariably in all the structures, mortar plays a vital role in construction. Generally mortar is mixture of cement, fine aggregate, water and different type of admixtures used depends upon the situation. The cost of cement is increasing progressively day to day. In consequently cost of the building is also being increased. Wood ash does not make any pollution and eco – friendly for green building construction. This material is easily get more from burning of wood in home and industries, there by the cost of material too be reduced. Therefore, it has planned to conduct experiment on mortar in which the cement is partially replaced by wood ash. SEM Analysis is also carried out in mortar mix for observing bond between cement and wood ash.

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Budd, C. J., A. R. Humphries und A. J. Wathen. „The Finite Element Approximation of Semilinear Elliptic Partial Differential Equations with Critical Exponents in the Cube“. SIAM Journal on Scientific Computing 20, Nr. 5 (Januar 1999): 1875–904. http://dx.doi.org/10.1137/s1064827596312134.

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38

Zakaria, La, Endah Yuliani und Asmiati Asmiati. „A Two-Dimensional mKdV Linear Map and Its Application in Digital Image Cryptography“. Algorithms 14, Nr. 4 (16.04.2021): 124. http://dx.doi.org/10.3390/a14040124.

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Cryptography is the science and study of protecting data in computer and communication systems from unauthorized disclosure and modification. An ordinary difference equation (a map) can be used in encryption–decryption algorithms. In particular, the Arnold’s cat and the sine-Gordon linear maps can be used in cryptographic algorithms for encoding digital images. In this article, a two-dimensional linear mKdV map derived from an ordinary difference mKdV equation will be used in a cryptographic encoding algorithm. The proposed encoding algorithm will be compared with those generated using sine-Gordon and Arnold’s cat maps via the correlations between adjacent pixels in the encrypted image and the uniformity of the pixel distribution. Note that the mKdV map is derived from the partial discrete mKdV equation with Consistency Around the Cube (CAC) properties, whereas the sine-Gordon map is derived from the partial discrete sine-Gordon equation, which does not have CAC properties.

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Kassed, Ghadeer Jabbar, und Sura Kareem Ali. „Reuse of Glass waste as a partial replacement to fine aggregates in concrete“. Journal of Engineering 27, Nr. 8 (01.08.2021): 43–58. http://dx.doi.org/10.31026/j.eng.2021.08.04.

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As human societies grow, the problem of waste management becomes one of the pressing issues that need to be addressed. Recycling and reuse of waste are effective waste management measures that prevent pollution and conserve natural resources. In this study, the possibility of using glass waste as an alternative was used as a partial weight substitute for fine aggregates with replacement ratios of 10, 20, 30, and 40% by the weight, and formed into test models (15 cm * 15 cm ) cube and (15 cm * 30 cm) cylinder, then matured and tested their strength compression and tensile strength at the age of 7 and 28 days and compared with a reference or conventional concrete with a mixing ratio (1: 1.5: 3) as well as testing its workability on fresh concrete. The results showed the possibility of using crushed glass wastes in concrete as a good alternative to fine aggregates, up to 30%. The compressive strength and tensile strength results at this ratio were 92.6% and 80.86% at the age of 28 days, respectively.

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Zaremsky, Matthew C. B. „The BNSR-invariants of the Houghton groups, concluded“. Proceedings of the Edinburgh Mathematical Society 63, Nr. 1 (15.07.2019): 1–11. http://dx.doi.org/10.1017/s0013091519000191.

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AbstractWe give a complete computation of the Bieri–Neumann–Strebel–Renz invariants Σm(Hn) of the Houghton groups Hn. Partial results were previously obtained by the author, with a conjecture about the full picture, which we now confirm. The proof involves covering relevant subcomplexes of an associated CAT (0) cube complex by their intersections with certain locally convex subcomplexes, and then applying a strong form of the Nerve Lemma. A consequence of the full computation is that for each 1 ≤ m ≤ n − 1, Hn admits a map onto ℤ whose kernel is of type Fm−1 but not Fm; moreover, no such kernel is ever of type Fn−1.

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Murakami, Takeshi. „Influence of Repeating of Partial Annealing and Light Rolling Process on Cube Texture in High Purity Aluminum“. Materials Science Forum 426-432 (August 2003): 3697–702. http://dx.doi.org/10.4028/www.scientific.net/msf.426-432.3697.

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Murakami, Takeshi. „Sharpening of Cube Texture in High Purity Aluminum Foil by Two Step Partial Annealing and Light Rolling“. Materials Science Forum 396-402 (Juli 2002): 417–22. http://dx.doi.org/10.4028/www.scientific.net/msf.396-402.417.

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43

Zhi, Chen, Muhammad Tahir und Tahir Mehmood. „Predicting Ethanol Steam Reforming Products of Au-Cu Supported over Nano-Shaped CeO2 Using the Johnsen Measure in PLS“. Applied Sciences 11, Nr. 21 (05.11.2021): 10402. http://dx.doi.org/10.3390/app112110402.

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Hydrogen fuel cells have long been regarded as a more environmentally friendly alternative to traditional fossil fuels. Ethanol steam reforming (ESR) is a promising long-term, safe method of producing carbon-neutral hydrogen. ESR products are (CeCO2) support generate hydrogen (H2) with byproducts such as carbon dioxide (CO2) and carbon monoxide (CO). The researchers are interested in the quantification and estimation of syngas components. The current article introduces the Johnsen index-based measure in partial least squares (PLS) for predicting ESR products with cube, polyhydra, and rod morphologies, based on FTIR. The proposed method makes use of existing filter measures such as loading weights, variable importance on projection, and significant correlation. The proposed PLS measures based on the Johnsen index outperform the existing methods for predicting ESR products based on FTIR spectroscopic data. For (H2) conversion percent prediction with cube and polyhedra morphologies, the functional compounds (C-O), (C=O), (CH), and (C-H,=CH2) are common. Similarly, the functional compound (s-RCH=CHR) is frequently used for (H2) conversion percent prediction with polyhedra and rod morphologies. Moreover, on simulated data, the proposed Johnsen measure in PLS demonstrates higher sensitivity and accuracy. Furthermore, the proposed Johnsen measure in PLS identifies influential wavenumbers that map over the functional compounds.

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Nik Ngah, Nik Anisah, Kartini Kamaruddin und Muhammad Safwan Nor Azlan. „The Effects of Windscreen Glass Waste (WGW) as Sand Replacement on The Compressive Strength of Mortar“. ANP Journal of Social Sciences and Humanities 2, Nr. 2 (01.08.2021): 63–67. http://dx.doi.org/10.53797/anpjssh.v2i2.8.2021.

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Nowadays, most of developing country having serious problems facing shortage of post consumers disposal waste site. Due to this problem, it has been suggested to regenerating and using waste glass product as ways of replacing sand as construction materials and prevents the environmental pollutions. Therefore, this paper is conducted to investigate the properties of the mortar, which contain windscreen glass waste as an admixture. During the research, 60 specimens of mortar were prepared by using different proportions of windscreen glass waste, which are 10%, 20% and 30%. The entire specimen was designed with w/c ratio of 0.5 and partial replaced the sand with windscreen glass waste. This research focuses on the compressive strength of the mortar. The specimen was cast in cube mould with the dimension of 50mm x 50mm x 50mm. Then, the specimen was tested for 7, 14 and 28 days of curing. The result of compressive strength test for the specimens which contain windscreen glass waste partial replacement of sand has compared with the control sample. Based on the results obtained the windscreen glass waste in preparing the mortar improved the strength of the mortar with partial replacement of 30% of windscreen glass waste.

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Zeleke, Tadele Yigrem, Kassahun Admassu Abegaz, Begashaw Worku Yifru und Dagmawi Tesfaw Yitayew. „Experimental Investigation on the Utilization of Marble and Scoria Powder as Partial Replacement of Cement in Concrete Production“. Advances in Civil Engineering 2023 (17.11.2023): 1–13. http://dx.doi.org/10.1155/2023/2279535.

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This paper explores how marble and scoria powder can be used as partial substitutes for ordinary Portland cement in creating C-25 concrete. Both materials contain over 50% of the major oxides found in cement, with marble high in CaO and scoria high in SiO2. Experimental investigations were conducted to study the chemical, physical, mechanical, and fresh properties of concrete containing marble and scoria powder. For the investigation, 13 different mixes, including the control mix, were used with a constant water–cement ratio of 0.5 and a slump range of 25–50 mm for concrete with a compressive strength (CS) of 25 MPa. Marble-to-scoria ratio of 2 : 1, 1 : 1, and 1 : 2 was used, and then the combined fraction of both marble waste and scoria in concrete was increased from 0% to 20% in 5% range. Including the control test specimens, a total of 117 (150 × 150 × 150 mm) concrete cubes for CS test, 39 (100 × 100 × 500 mm) concrete beam specimens for flexural strength test, 39 (100 × 200 mm) cylinder specimens for splitting tensile strength (STS) test and, 39 (100 × 100 × 100 mm) cube specimens for water absorption test were cast and tested at 3, 7, 28, and 56 days. The test results indicate that marble and volcanic scoria powders with marble-to-scoria ratio of 1 : 1 could replace cement up to 15% without compromising the CS and up to 10% without compromising the flexural and STS; also, the water absorption decreases up to 10% replacement; however, the workability of the fresh mix decreases as the combined replacement level of marble and scoria increases. Generally, a 10% replacement with marble-to-scoria ratio of 1 : 1 produces concrete with higher compressive, flexural, tensile strength, and water absorption manifestations when compared to conventional concrete.

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Abdul Rahim, Mustaqqim, Norlia Mohamad Ibrahim, Zulliza Idris, Zuhayr Md Ghazaly, Shahiron Shahidan, Nur Liza Rahim, Liyana Ahmad Sofri und Nur Fitriah Isa. „Properties of Concrete with Different Percentange of the Rice Husk Ash (RHA) as Partial Cement Replacement“. Materials Science Forum 803 (August 2014): 288–93. http://dx.doi.org/10.4028/www.scientific.net/msf.803.288.

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The use of pozzolanic material from waste product as partial cement replacement in concrete contribute to reduce the environmental, economic problem through their waste and as well enhance the strength and properties of concrete. Rice husk ash (RHA) is one of the industrial waste that suitably used as a cement replacement due to its pozzolanic properties which can enhance the properties of concrete. In this study, the workability, compressive strength and water absorption of the concrete containg RHA is investigating. The chemical content of RHA also investigated by using X-ray Fluorescence Test (XRF). The different RHA percentage of 5%, 15% and 25% were used in this study with burning temperature 650°C. The concrete cube of size 100 mm x 100 mm x 100 mm were prepared and cured for 7, 14 and 28 days. Based on result, it was concluded that the optimum RHA replacement for cement in this report was 5 %, which provided the highest compressive strength at 28 days.

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Stenger, R., S. Herzog, I. Kottlarz, B. Rüchardt, S. Luther, F. Wörgötter und U. Parlitz. „Reconstructing in-depth activity for chaotic 3D spatiotemporal excitable media models based on surface data“. Chaos: An Interdisciplinary Journal of Nonlinear Science 33, Nr. 1 (Januar 2023): 013134. http://dx.doi.org/10.1063/5.0126824.

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Motivated by potential applications in cardiac research, we consider the task of reconstructing the dynamics within a spatiotemporal chaotic 3D excitable medium from partial observations at the surface. Three artificial neural network methods (a spatiotemporal convolutional long-short-term-memory, an autoencoder, and a diffusion model based on the U-Net architecture) are trained to predict the dynamics in deeper layers of a cube from observational data at the surface using data generated by the Barkley model on a 3D domain. The results show that despite the high-dimensional chaotic dynamics of this system, such cross-prediction is possible, but non-trivial and as expected, its quality decreases with increasing prediction depth.

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Tratnik, Niko. „Zhang-Zhang Polynomials of Phenylenes and Benzenoid Graphs“. MATCH – Communications in Mathematical and in Computer Chemistry 92, Nr. 1 (2024): 25–53. http://dx.doi.org/10.46793/match.92-1.025t.

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The aim of this paper is to study some variations of the Zhang-Zhang polynomial for phenylenes, which can be obtained as special cases of the multivariable Zhang-Zhang polynomial. Firstly, we prove the equality between the first Zhang-Zhang polynomial of a phenylene and the generalized Zhang-Zhang polynomial of some benzenoid graph, which enables us to prove also the equality between the first Zhang-Zhang polynomial and the generalized cube polynomial of the resonance graph. Next, some results on the roots of the second Zhang-Zhang polynomial of phenylenes are provided and another expression for this polynomial is established. Finally, we give structural interpretation for (partial) derivatives of different Zhang-Zhang polynomials.

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Kimura, S., G. Schubert und J. M. Straus. „Time-dependent convection in a fluid-saturated porous cube heated from below“. Journal of Fluid Mechanics 207 (Oktober 1989): 153–89. http://dx.doi.org/10.1017/s0022112089002545.

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A numerical scheme based on the pseudospectral method has been implemented in order to study three-dimensional convection in a fluid-saturated cube of porous material. With increasing Rayleigh number R, convection first evolves from a symmetric steady state (S) to a partially non-symmetric steady state (S’, physical symmetry in the vertical direction is preserved). The transition Rayleigh number is about 550. At a Rayleigh number of 575 the flow becomes oscillatory P(1) with a single frequency that increases with R. At a value of R between 650 and 680 the oscillation becomes quasi-periodic with at least two fundamental frequencies. It returns to a simply periodic state in a narrow range about R = 725. A further increase of R transforms the simply periodic state again to a quasi-periodic state. The sequence of three-dimensional time-dependent states resembles previously studied two-dimensional cases in that evolution from more complex states to less complex states occurs with increasing R. The partial symmetry breaking prior to the onset of time dependence is unique to the three-dimensional flows, but a dependence of the S → S’ transition on the step size in R suggests the possibility that S → S’ might not occur prior to S → P(1) for sufficiently small steps in R. The quasi-periodic flows sometimes exhibit intermittency, causing difficulty in exactly defining their spectral characteristics.

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Sandhyarani, E., und Ch Srinivasa Rao. „Experimental study on concrete by partial replacement of fine aggregate with steel slag and cement with metakaolin and glass powder“. IOP Conference Series: Materials Science and Engineering 1282, Nr. 1 (01.10.2023): 012014. http://dx.doi.org/10.1088/1757-899x/1282/1/012014.

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Abstract The present study will describe the characteristics and the effects of concrete properties when fine aggregate is partially substituted by steel slag and cement partially substituted by metakaolin and glass powder at 0%, 10%, 20% and 30. Compressive, tensile, flexural strength, and durability tests were conducted on the cube and cylinder specimens. The test results were compared with conventional concrete specimens. The tests are conducted on specimens for 7days and 28days. Based on the outcomes of the study, it was concluded that replacing cement and fine aggregate with glass powder, metakaolin, and steel slag increases the strength of concrete and reduces attack at 30% replacement. Hopefully, the results have clearly demonstrated the concrete constructions can also be made from eco-friendly alternative materials which are cost-effective and sustainable for longtime.

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