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Articles de revues sur le sujet « Directional Structure »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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1

M., Sugavaneswaran, and Arumaikkannu G. "Additive manufactured multi-material structure with directional specific mechanical properties based upon classical lamination theory." Rapid Prototyping Journal 24, no. 7 (2018): 1212–20. http://dx.doi.org/10.1108/rpj-06-2017-0118.

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Purpose This paper aims to additive manufacture (AM) the multi-material (MM) structure with directional-specific mechanical properties based on the classical lamination theory of composite materials. Design/methodology/approach The polyjet three-dimensional printing (3DP) process is used to fabricate the MM structure with directional-specific mechanical properties. MMs within a layer are positioned and oriented based on the classical lamination theory to achieve directional-specific properties. Mechanical behavior of the AM structure was examined under various loading conditions to justify the

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Liu, Yan, Ping Sheng, and Wei Zhen. "Design and Construction on the Roof Systems of Guangzhou South Railway Station." Advanced Materials Research 163-167 (December 2010): 496–500. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.496.

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The roof structures of Guangzhou South Railway Station are long-span spatial steel structures, The form and structure system are complicated. Prestress cable-arch structure, cable-shell structure and tri-directional truss-string spatial structure are applied. It recommend the construction and design process of roof structure, and also give an analysis of roof structure's working principle on prestress cable-arch structure , cable-shell structure, and the tri-directional truss-string structures. The results show that working stability of the roof structures is good.

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Yu, Dong, Zhao Bo Chen, Bo Ming Zhang, Ying Hou Jiao, and Long Xue Jin. "Shape Memory Alloy Driven Two-Way Deformation Structure Design." Applied Mechanics and Materials 433-435 (October 2013): 2129–33. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.2129.

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Shape memory alloy (SMA) is a type of smart material with huge driving force, and large driven displacement. Using SMA as the structure driver may force a bi-directional deformation structure that can achieve high efficiency and compact driving structure. SMA, together with elastic component, forms the two-way driving structure; however the two, if respectively serving as the driver, can enable the occurrence of the simplest bi-directional drivable structure. The offset structure constituted by SMA, not only can achieve two-way drive, and does not require continuous input of energy during the

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Zhang Xiao-Yue, Xu Hua-Feng, Chen Wan-Na, Zhou Nong, and Wu Hong-Wei. "Selective excitation of localized acoustic skyrmion modes based on directional sound sources." Acta Physica Sinica 74, no. 5 (2025): 0. https://doi.org/10.7498/aps.74.20241286.

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Acoustic skyrmion modes are topological texture structures of velocity field vectors generated on the surface of acoustic structures. This protected vector distribution provides new dimensions for advanced sound information processing, transmission, and data storage. In this study, we design a combined structure of waveguides and spiral structures, using directional acoustic sources to excite waveguide mode transmission, thereby achieving selective excitation of localized acoustic skyrmion modes. Through theoretical analysis and numerical simulations, we studied the pressure field distribution

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Wu, Xinming. "Directional structure-tensor-based coherence to detect seismic faults and channels." GEOPHYSICS 82, no. 2 (2017): A13—A17. http://dx.doi.org/10.1190/geo2016-0473.1.

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Seismic coherence is widely used in seismic interpretation and reservoir characterization to highlight (with low values) faults and stratigraphic features from a seismic image. A coherence image can be computed from the eigenvalues of conventional structure tenors, which are outer products of gradients of a seismic image. I have developed a simple but effective method to improve such a coherence image by using directional structure tensors, which are different from the conventional structure tensors in only two aspects. First, instead of using image gradients with vertical and horizontal deriv

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Ayano, Seiki. "The Layered Internal Structure of Spatial PPs." Adpositions of Movement 18 (December 31, 2004): 3–27. http://dx.doi.org/10.1075/bjl.18.03aya.

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The principal goal of this paper is to show that spatial PPs in English and Dutch have a layered internal structure. In these languages, we find PP constructions containing multiple Ps, which can be analyzed as having a layered PP structure. That is, [+locational] PP headed by lexical P is embedded in [±directional] pP headed by functional p. Following van Riemsdijk (1990) and Emonds (2001), I further propose that in English, both [+locational] P and [±directional] p are head-initial, while in Dutch, the former is head-initial and the latter, head-final. This layered PP analysis has two desira

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Son, Minjung, Yunjin Lee, Henry Kang, and Seungyong Lee. "Structure grid for directional stippling." Graphical Models 73, no. 3 (2011): 74–87. http://dx.doi.org/10.1016/j.gmod.2010.12.001.

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Wang, Mengjie, Zilong Peng, Chi Li, et al. "Multi-Scale Structure and Directional Hydrophobicity of Titanium Alloy Surface Using Electrical Discharge." Micromachines 13, no. 6 (2022): 937. http://dx.doi.org/10.3390/mi13060937.

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Titanium alloys with special macro-micro composite structures of directional hydrophobicity are difficult to prepare due to poor thermal conductivity and good corrosion resistance, inhibiting the wide engineering applications for aerospace, marine engineering, and biomedicine. To prepare macro-micro composite structures on the surface of titanium alloys and achieve directional hydrophobicity, the sub-millimeter structures with an edge width of 150 μm, a groove width of 250 μm, and a depth of 250 μm were fabricated on the titanium alloy by wire electrical discharge machining (WEDM) technology,

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Ayik, Muratcan, Hamza Kurt, Oleg V. Minin, Igor V. Minin, and Mirbek Turduev. "Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure." Nanomaterials 12, no. 23 (2022): 4194. http://dx.doi.org/10.3390/nano12234194.

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In this manuscript, we demonstrate the design and experimental proof of an optical cloaking structure that multi-directionally conceals a perfectly electric conductor (PEC) object from an incident plane wave. The dielectric modulation around the highly reflective scattering PEC object is determined by an optimization process for multi-directional cloaking purposes. Additionally, to obtain the multi-directional effect of the cloaking structure, an optimized slice is mirror symmetrized through a radial perimeter. The three-dimensional (3D) finite-difference time-domain method is integrated with

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Mohanraj, A. P., A. Elango, D. Ragavendhiran, P. Vignesh Raja, and K. Ashok. "Design and Movement Analysis of Single Roller Omni Directional Wheeled Robot for Different Assembly Structures." Applied Mechanics and Materials 592-594 (July 2014): 2324–28. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2324.

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This paper addresses the movement analysis of square structured and triangular structured Omni directional mobile robots and its combination in the form of octagonal structured mobile robot. The Omni wheel used in this research is having 8 rollers made up of synthetic rubber coated polypropylene rollers. An experiment was setup to analyse the movement of the square, triangular and octagonal structured robot in x-axis, y-axis and rotary motion. This experiment is an attempt of combining square structure and triangular structure robot in a single robot. Omni Directional mobile robot creates anot

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Connacher, Mary Katherine, Jian Wei Tay, and Natalie G. Ahn. "Rear-polarized Wnt5a-receptor-actin-myosin-polarity (WRAMP) structures promote the speed and persistence of directional cell migration." Molecular Biology of the Cell 28, no. 14 (2017): 1924–36. http://dx.doi.org/10.1091/mbc.e16-12-0875.

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In contrast to events at the cell leading edge, rear-polarized mechanisms that control directional cell migration are poorly defined. Previous work described a new intracellular complex, the Wnt5a-receptor-actomyosin polarity (WRAMP) structure, which coordinates the polarized localization of MCAM, actin, and myosin IIB in a Wnt5a-induced manner. However, the polarity and function for the WRAMP structure during cell movement were not determined. Here we characterize WRAMP structures during extended cell migration using live-cell imaging. The results demonstrate that cells undergoing prolonged m

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Luxmoore, Jamie F., Suzana Ilic, and Nobuhito Mori. "On kurtosis and extreme waves in crossing directional seas: a laboratory experiment." Journal of Fluid Mechanics 876 (August 8, 2019): 792–817. http://dx.doi.org/10.1017/jfm.2019.575.

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We examine the statistical properties of extreme and rogue wave activity in crossing directional seas, to constrain the probabilistic distributions of wave heights and wave crests in complex sea states; such crossing seas alter the statistical structure of surface waves and are known to have been involved in several marine accidents. Further, we examine the relationship between the kurtosis as an indicator of nonlinearity in the spectrum and the directionality and crossing angles of the sea-state components. Experimental tests of two-component directionally spread irregular waves with varying

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Meng, Qing Hui, Yi Ping Lu, Yong Dong, and Ting Ju Li. "Microstructure and Properties of Ni_70.2Si_29.8 Eutectic Alloy Produced by Directional Solidification." Materials Science Forum 789 (April 2014): 54–58. http://dx.doi.org/10.4028/www.scientific.net/msf.789.54.

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The directional solidification of Ni70.2Si29.8 eutectic alloy was carried out, and the solidification microstructure and compression properties of Ni2Si – Ni31Si12 eutectic composite were systematically studied. Directional solidification samples were obtained by induction heating and down – draw process. During directional solidification, well-aligned lamellar structure with a micron scale was obtained in directional solidified Ni70.2Si29.8 eutectic alloy. Despite it is a kind of faceted – faceted eutectic alloys, highly regular and homogeneous structure was obtained through directional solid

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Vakulenko, I. O., M. A. Hryshchenko, and O. M. Perkov. "THE DEPENDENCE OF THE FORMATION PROCESSES OF DEFORMATION BANDS FROM THE STRUCTURAL PARAMETERS OF LOW-CARBON STEELS AFTER THE ANNEALING." Science and Transport Progress, no. 19 (December 25, 2007): 241–42. http://dx.doi.org/10.15802/stp2007/17569.

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The causes of directionaty of the yield point, stress of microyielding, and Chernov–Luders deformation in lowcarbon steel have been investigated. The observed of Chernov–Luders deformation be haviour is considered to be the result of a directional variation in the grain size of berrite to cause formation dislocation cell structure.

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Meng, Qing’an, Junjie Zhou, Jie Pang, Wenli Qiu, Xiaopeng Wang, and Wenfeng Qin. "Controlling Directional Liquid Transfer over a Ratchet-like Surface with Oriented Open-Wedges." Coatings 14, no. 10 (2024): 1308. http://dx.doi.org/10.3390/coatings14101308.

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Directed transfer of liquids is widely used as an important mass transfer strategy in the nature biology, industry, agriculture, and medical fields. Based on the bionic concept, researchers have constructed various forms of surface structures to realize controlled transport of liquids. However, current methods for preparing surfaces with directional liquid transport often suffer from cumbersome preparation processes, complexity of the prepared structures, and high costs. In this paper, we prepared a topological structure surface capable of precisely controlling liquid transport by a facile met

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Abe, Koyu, Yusuke Tanida, and Masaru Uchiyama. "Structural Analysis of Directional Deflection Beams." Journal of Robotics and Mechatronics 17, no. 3 (2005): 359–66. http://dx.doi.org/10.20965/jrm.2005.p0359.

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Parallel leaf springs are often used for precise linear motion because of their simplicity and freedom from static friction in cases where elasticity and high deformation are required. Using a parallel beam in force sensing requires minimum deflection and limited stress concentration. We previously proposed a unidirectional force sensor based on the H-slit parallel beam structure – an extension of conventional parallel beam. In this paper, we use finite element analysis (FEA) to investigate parallel beam structures that deflect easily in one direction, and evaluate the optimum profile for the

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Fong, Ronald. "A Constructional-Cognitive Analysis of Chinese Directionals." Cognitive Semantics 1, no. 1 (2015): 104–30. http://dx.doi.org/10.1163/23526416-00101004.

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This paper investigates the syntactic and semantic behaviour of directional items in Mandarin Chinese, proposing a constructional-cognitive model. Simultaneously, it argues against the traditional analysis of directionals as part of a compound. Instead, they are treated as proper larger constructions signaling subordination, based upon structural and functional evidence. Particularly, the verbs of motion are presented as catenative verbs (Aarts 2011, Huddleston and Pullum et al 2002) similar to those found in English, showing event complexity (eg Jackendoff 2002, Levin and Rappaport Hovav 2005

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Malcharcziková, Jitka, Miroslav Kursa, and Martin Pohludka. "Nickel Alloys in Directionally Solidified State – Characterisation of Microstructure and Phase Composition of the Alloys." Materials Science Forum 782 (April 2014): 441–44. http://dx.doi.org/10.4028/www.scientific.net/msf.782.441.

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The paper deals with the characterisation of the structure and phase composition of selected types of nickel alloys. Experimental alloys were prepared by vacuum induction casting. Castings were directionally solidified in corundum tubes with specified apex angle in the two-zone crystallisation furnace. Rate of directional solidification was 100 mm/h. Observation was carried out on the samples in the as-cast and directed state. Influencing of the structure by the process of directional solidification is evident. Porosity and micro-hardness were determined in transverse and longitudinal sections

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Nguyen, Kien Dinh, and Dong Lam Vu. "Seismic Analysis of AP1000 Nuclear Island Structure by Using the Finite Element Software ANSYS." Science and Technology Development Journal 20, K2 (2017): 14–23. http://dx.doi.org/10.32508/stdj.v20ik2.444.

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Seismic analysis of AP1000 nuclear island structure by using the commercial finite element software ANSYS is presented. Using the ANSYS Workbench, a sophisticated threedimensional finite element model of the structure is created and employed in the analysis. Dynamic response of the structure to both the one-directional and three-directional acceleration time histories are considered in the analysis. The time histories for the relative displacement, velocity and absolute acceleration of the structure are obtained for various earthquakes, including American El Centro, Japanese Kobe and Vietnames

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Le Yu, Le Yu, Xiao Xiong Xiao Xiong, Di Liu Di Liu, et al. "Multiple directional enhanced light source through a periodic metal grating structure." Chinese Optics Letters 15, no. 8 (2017): 082401. http://dx.doi.org/10.3788/col201715.082401.

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Saleah, Sm Abu, Daewoon Seong, Sangyeob Han, et al. "Integrated Quad-Scanner Strategy-Based Optical Coherence Tomography for the Whole-Directional Volumetric Imaging of a Sample." Sensors 21, no. 4 (2021): 1305. http://dx.doi.org/10.3390/s21041305.

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Whole-directional scanning methodology is required to observe distinctive features of an entire physical structure with a three dimensional (3D) visualization. However, the implementation of whole-directional scanning is challenging for conventional optical coherence tomography (OCT), which scans a limited portion of the sample by utilizing unidirectional and bidirectional scanning methods. Therefore, in this paper an integrated quad-scanner (QS) strategy-based OCT method was implemented to obtain the whole-directional volumetry of a sample by employing four scanning arms installed around the

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Wang, Sihui, Zhengdong Li, Xiaopeng Gong, Feng Hou, and Ji Liang. "Self-Assembly and Properties of Elastic Nanocellulose-Carbon Airgel with Ordered Porosity by Template-Free Directional Freezing." Coatings 13, no. 7 (2023): 1297. http://dx.doi.org/10.3390/coatings13071297.

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Porous cellulose aerogels with different compositions have been fabricated via three methods, including regular freezing, directional freezing, and hydrothermal treatment, using pure cellulose oxide and cellulose oxide/graphite oxide composites, respectively. The cellulose aerogels are highly elastic and light in weight. The carbon aerogels show an ordered structure through directional freezing with layered skeleton bones and some folds. Unlike low-temperature freezing, the structures can obtain elastic properties. When the deformation is 20%, carbon aerogels can rebound to 95% of their origin

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Zhang, Zheng, and Yunmu Jiang. "Failure Probability and Economic Loss Assessment of a High-Rise Frame Structure under Synthetic Multi-Dimensional Long-Period Ground Motions." Buildings 14, no. 1 (2024): 252. http://dx.doi.org/10.3390/buildings14010252.

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Multiple research studies and seismic data analyses have shown that multi-directional long-period ground motion affects crucial and intricate large-scale structures like oil storage containers, long-span bridges, and high-rise buildings. Seismic damage data show a 3–55% chance of long-period ground motion. To clarify, the chance of occurrence is 3% in hard soil and 83% in soft soil. Due of the above characteristics, the aseismic engineering field requires a realistic stochastic model that accounts for long-period multi-directional ground motion. A weighted average seismic amplification coeffic

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Xu, Cai Ling. "Multi-Directional Squeeze Casting Based on the Uniform Internal Structure of Solidified Body." Applied Mechanics and Materials 397-400 (September 2013): 83–86. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.83.

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It has analyzed that there is no difference between positive and radial pressure of the interior of multi-directional squeeze casting solidified body. The isotropy of pressure makes the consistency of heat exchange coefficient of interface, crystalline growth velocity and plastic deformation, which thereby enables the solidification structure form of multi-directional squeeze casting parts to eliminate the defects of directional difference of single axis squeeze and non-uniformity of density. It has put forward that multi-directional squeeze casting technique shall be adopted for producing hig

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Liang, Xiang Feng, Yu Tao Zhao, Zhen Li Zuo, and Zhi Hong Jia. "Manufacture and Analysis of Directional Solidification Organization of CMSX-6 Nickel-Base Superalloy." Key Engineering Materials 575-576 (September 2013): 394–97. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.394.

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In this paper, we use the High rate solidification to study process parameters and CMSX-6 super-alloy solidification structure. And then, it can provide more basis for the industrial directionally solidified casting of superalloys blades. The results show that: under certain process parameters, it can be obtained parallel columnar crystals directional solidification structure. The organization is composed of the matrix γ phase and the secondary precipitated γ ' phase; under an optical microscope, it can be observed the shrinkage porosity due to the volumes reduction arising solidification.

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Cui, Hong Bao, Li Feng Zheng, and Jin Yong Wang. "Microstructure Evolution and Corrosion Behavior of Directionally Solidified FeCoNiCrCu High Entropy Alloy." Applied Mechanics and Materials 66-68 (July 2011): 146–49. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.146.

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The microstructures of FeCoNiCrCu high entropy alloy were investigated under directional solidification. The results showed that only diffraction peak corresponding to a FCC crystal structure was observed in the directionally solidified FeCoNiCrCu alloy. With increasing solidification rate, the interface morphology would grows in planar, cellular and dendrite. Comparing the potentiodynamic polarization of as-cast and directionally solidified FeCoNiCrCu high entropy alloy in a 3.5%NaCl solution, it is clearly reveals that the corrosion resistance of directionally solidified FeCoNiCrCu alloy is

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Li, Xiang, Guang-yan Huang, Zhi-wei Guo, and Shun-shan Feng. "The fragments distribution of the nonaxisymmetric directional-focusing warhead." Journal of Physics: Conference Series 2478, no. 7 (2023): 072027. http://dx.doi.org/10.1088/1742-6596/2478/7/072027.

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Abstract Charge structure, which can instantly release much energy, is a significant research point in explosive protection and warhead. A nonaxisymmetric directional-focusing warhead based on a quadrangular charge structure was designed, and the distribution of fragments from the warhead involved was studied. Numerical calculation research was carried out based on the ABAQUS finite element calculation software. The witness targets of fragments were obtained from an equal-scale explosion experiment, which provided experimental support for numerical simulation research. The results show that th

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Hong, Tao, Shuli Zheng, Rongke Liu, and Weiting Zhao. "Design of mmWave Directional Antenna for Enhanced 5G Broadcasting Coverage." Sensors 21, no. 3 (2021): 746. http://dx.doi.org/10.3390/s21030746.

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5G mmWave broadcasting is considered to be the main method of future broadcasting. However, the mmWave transmission has a large space loss, especially in tunnels. In order to compensate for the attenuation of the broadcast signal, a directional horn antenna is designed in this paper. Substrate integrated waveguide (SIW) technology, dual-element arrays and extension structures are used to improve the antenna structure and achieve good directional characteristics. The multi-objective genetic algorithm (MOGA) is used to optimize the antenna parameters and improve optimization efficiency. Ultimate

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Li, Bingbing, Dongguang Xu, Xiaohui Zheng, and Bowen Zheng. "Lateral/Directional Control Law Design for Civil Airplane Based on Eigen Structure Assignment." Journal of Physics: Conference Series 2132, no. 1 (2021): 012050. http://dx.doi.org/10.1088/1742-6596/2132/1/012050.

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Abstract Considering disadvantages of lateral/directional mode characteristics of civil aircraft, design requirements are thus presented and the P-Beta control law architecture is adopted for the lateral/directional control law. Meanwhile, the practical application of eigen structure assignment in the design of lateral/directional control law is studied. By eigen structure assignment the closed loop is designed, and the decoupling of roll channel and yaw channel is realized. Through the design of feed-forward command channel, the pilot’s stick control roll rate and pedal control sideslip angle

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Taylor, David, Sean Garber, Scott Collins, Scott Baker, and Andrew Cornett. "EXTREME WAVES IN SHALLOW WATER AND DREDGED CHANNELS FOR DIRECTIONAL SEAS." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 37. http://dx.doi.org/10.9753/icce.v37.structures.37.

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Extreme wave conditions at coastal structures located offshore of natural coastlines and the zone of wave breaking are influenced by the deepwater wave conditions, the coastal bathymetry between deepwater and the structure, and the ongoing growth, generation and decay of waves across the coastal shelf. At locations where the coastal shelf is relatively flat, the gradually reducing water depths can limit the significant and maximum wave heights and crest elevations that may be encountered. If a coastal structure is located in deeper water than the bathymetry of approaching waves, for example po

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Folgueras, Pedro, Sebastián Solari, and Miguel Ángel Losada. "The selection of directional sectors for the analysis of extreme wind speed." Natural Hazards and Earth System Sciences 19, no. 1 (2019): 221–36. http://dx.doi.org/10.5194/nhess-19-221-2019.

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Abstract. This paper presents a rational method for the selection of the most suitable directional sectors in the analysis of extreme wind loads on structures. It takes into consideration the main sources of uncertainty stemming from sector selection and leads to the definition of independent and statistically homogeneous directional sectors. This method is applied to the selection of directional sectors for the calculation of the design wind speed of a structure located at the mouth of the Río de la Plata. The results in the estimated reliability and costs were compared to those obtained with

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Song, Xiaodong, Zilong Ti, and Yuanzhou Zhou. "Estimation of Directional Wave Spectrum Using Measurement Array Pressure Data on Bottom-Mounted Offshore Structure in Incident and Diffracted Wave Field." Shock and Vibration 2022 (February 27, 2022): 1–19. http://dx.doi.org/10.1155/2022/9764478.

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Determination of the directional wave spectrum which offshore structures actually encounter is essential for multiple applications including wave-induced load and vibration evaluation, and hence becomes a fundamental task in ocean engineering. Due to the wave diffraction effect, wave field around an offshore structure is the mixture of incident wave components and diffracted wave components. Estimating directional wave spectrum in diffracted wave field significantly differs from the occasion in undisturbed waves since the amplitude and phase relationship between the incident and diffracted wav

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Hu, Qingxi, Die Feng, Haiguang Zhang, Yuan Yao, Mohamed Aburaia, and Herfried Lammer. "Oriented to Multi-Branched Structure Unsupported 3D Printing Method Research." Materials 13, no. 9 (2020): 2023. http://dx.doi.org/10.3390/ma13092023.

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For the traditional three-axis (3D) configuration of the additive manufacturing (AM) platform, when printing the target model with a multi-branched structure, it is imperative to construct adequate support structures. To eliminate the use of support during the printing process, a non-directional unsupported 3D printing method for five-axis AM is proposed in this paper. By carrying out the K-means clustering algorithm, the coarse partition of the model is obtained, and then the fine decomposition represented by a sequence of separating planes is determined by a local dynamic search adjustment a

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Huang, Wei, Ningye He, Renxia Ning, and Zhenhai Chen. "Wideband Reflector and Analogue Electromagnetically Induced Reflection in Metamaterials." Crystals 11, no. 8 (2021): 985. http://dx.doi.org/10.3390/cryst11080985.

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Metamaterials are highly demanded for advanced applications in absorbers, sensors, and filters. However, metamaterial reflectors, especially broadband reflectors, remain challenging. In this paper, we theoretically investigate a wideband metamaterial reflector which consists of cross shaped graphene strips and a silica (SiO2) substrate. The cross shaped graphene strips are coated on the top of the structure, and the cross shape rotated 45° graphene strips are spun on the bottom of it. The calculated reflection can be tuned through length and width of the graphene strips. By comparison, not onl

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Sarapultsev, D. A., A. A. Zolotorev, and M. L. Tsoregradskaya. "Analysis and Modeling of a Directional Microwave Coupler as SMD Component." Nano- i Mikrosistemnaya Tehnika 23, no. 3 (2022): 137–42. http://dx.doi.org/10.17587/nmst.24.137-142.

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The article describes the calculation, modeling and layout of the directional coupler. In the course of the work the market analysis was carried out, the model of directional coupler in the frequency range of 2.9—4.5 GHz, the layout of the device and measuring equipment were developed. Directional couplers with different transient attenuation are widely used in the distribution circuits of antenna arrays, as well as to control the power of the radio signal propagating in the transmission line, in power meters, automatic gain control systems, radio receivers, etc. The choice of circuit solution

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Zhang, Shu, Su Gui Tian, Yong Su, and Ben Jiang Qian. "Microstructure Evolution and Analysis of a Single Crystal Nickel-Based Superalloy during Tensile Creep." Materials Science Forum 689 (June 2011): 154–58. http://dx.doi.org/10.4028/www.scientific.net/msf.689.154.

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By means of the finite element method (FEM) for calculating the von Mises stress and strain energy density in the cubic γ/γ′ phases, the regularity of γ′ phase directional growth is investigated. Results show that the change of the strain energy density in the different planes of the cubical γ′ phase occurs during tensile creep of alloy, the cubical γ′ phase is directionally grown, along the crystal plane with bigger strain energy, to transform into the mesh-like rafted structure along the direction perpendicular to the applied stress axis. The change of the atomic potential energy, interfacia

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Wilden, J., H. Frank, C. Theiler, T. Seefeld, and G. Sepold. "Simulation of laser cladding." Journal de Physique IV 120 (December 2004): 397–403. http://dx.doi.org/10.1051/jp4:2004120045.

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Nickel and titanium aluminides already show a high potential for use in lightweight applications at elevated temperatures; however, the strength of these intermetallics can be increased by directional solidification. These materials show a brittle behaviour at temperatures less than 600°C. Strength and ductility of aluminides are controlled by phase formation during solidification. The problem of crack formation had to be solved for laser rapid prototyping of intermetallics, and the process conditions for formation of directionally solidified structures have to be specified in order to generat

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Zheng, Xi Tao, Qiang Yang, and Lin Hu Gou. "Finite Element Analysis of 4-Step 3-Dimensional Braided Composite Structure under High Velocity Impact." Key Engineering Materials 462-463 (January 2011): 289–94. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.289.

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The finite element method was used to simulate and analyze I-shaped beam which was made of the three-dimensional braided composite and suffered from bird impact. The models contained five braiding modes, two kinds of three-dimensional three-directional braiding and three kinds of three-dimensional six-directional braiding. Three kinds of thickness (10 mm, 15 mm and 20 mm), and all of these models were impacted by three different velocities (80 m/s, 150 m/s and 200 m/s) respectively. The bird has different mechanical properties in different velocities; therefore, different finite element models

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Subraman, T., and S. Sujatha. "Dynamic Analysis of Structure Subjected to Bi-Directional and Uni-Directional Earthquake Forces Using ETABS." International Journal of Engineering & Technology 7, no. 3.10 (2018): 108. http://dx.doi.org/10.14419/ijet.v7i3.10.15641.

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When the buildings are are subjected to gravitational and seismic hundreds the larger height acceleration thing is performing in a single course (uni-directional) and with the two additives appearing inside the lateral and within the transverse directions (bi-directional). It’s miles determined that there aren't any incredible variations among them but the interplay among the bending moments and the axial force inside the yield surfaces is considered. The differences among the responses acquired from the uni- and the bi-directional dynamic loads are evaluated via the usage of etab software and

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Guo, J. J., X. X. Du, L. L. Zhou, B. D. Zhou, Y. Y. Qi, and G. G. Li. "Superplasticity in NiAl and NiAl-based alloys." Journal of Materials Research 17, no. 9 (2002): 2346–56. http://dx.doi.org/10.1557/jmr.2002.0344.

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Superplastic deformation was realized on NiAl and NiAl-based alloys prepared by both common casting and directional solidification. Directionally solidified NiAl–27Fe–3Nb alloy as well as conventionally cast NiAl, NiAl–25Cr, NiAl–9Mo, NiAl–20Fe–Y.Ce, and NiAl–30Fe–Y alloys exhibited typical deformation characteristics shown in conventionally superplastic materials. NiAl and NiAl-based alloys could be divided into three categories depending on their different superplastic behavior: finely grained structure (NiAl–9Mo, NiAl–25Cr, NiAl–20.4Fe–Y.Ce, NiAl–30Fe–Y), coarsely grained structure (NiAl),

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Xu, Hanbo, and Zhiwei Men. "Utilizing Metasurfaces for Directional Control of LED Emission." Advances in Engineering Technology Research 11, no. 1 (2024): 606. http://dx.doi.org/10.56028/aetr.11.1.606.2024.

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This study provides a detailed modeling and analysis of four different three-dimensional GaN-based LED structures. The results reveal that incorporating DBRs effectively focuses light and enhances the light extraction efficiency (LEE). Additionally, the integration of Metasurface in the Micro-LED+DBRs+M structure allows for precise control of light emission direction and further radiation focusing. Furthermore, in the Micro-LED+DBRs+M2 structure with improved periodic nanocolumns, the light beam can be deflected simultaneously in multiple directions. These findings offer new possibilities for

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Noh, Hohsuk, Hyuna Jang, Kun Ho Kim, and Jong-Min Kim. "Nonparametric Directional Dependence Estimation and Its Application to Cryptocurrency." Axioms 12, no. 3 (2023): 293. http://dx.doi.org/10.3390/axioms12030293.

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This paper proposes a nonparametric directional dependence by using the local polynomial regression technique. With data generated from a bivariate copula having a nonmonotone regression structure, we show that our nonparametric directional dependence is superior to the copula directional dependence method in terms of the root-mean-square error. To validate the directional dependence with real data, we use the log returns of daily prices of Bitcoin, Ethereum, Ripple, and Stellar. We conclude that our nonparametric directional dependence, by using the local polynomial regression technique with

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Nasonov, Andrey V., Andrey S. Krylov, Xenya Yu Petrova, and Michael N. Rychagov. "Edge-directional interpolation algorithm using structure tensor." Electronic Imaging 2016, no. 15 (2016): 1–4. http://dx.doi.org/10.2352/issn.2470-1173.2016.15.ipas-026.

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Feng, Zhifang, Chuanpo Shao, and Dandan Zhang. "Off-plane directional coupler in woodpile structure." Optik 126, no. 24 (2015): 5213–17. http://dx.doi.org/10.1016/j.ijleo.2015.09.168.

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Deryaev, Annaguly Rejepovich. "DESIGN OF THE INCLINED-DIRECTIONAL WELL STRUCTURE." Theoretical & Applied Science 119, no. 03 (2023): 1–6. http://dx.doi.org/10.15863/tas.2023.03.119.1.

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TOLSKAYA, INNA K. "Verbal prefixes in Russian: Conceptual structure versus syntax." Journal of Linguistics 51, no. 1 (2014): 213–43. http://dx.doi.org/10.1017/s0022226714000206.

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At first glance, the variety of possible denotations of a given prefix in Russian might appear a chaotic set of idiomatic meanings, e.g. the prefix za- may refer to the beginning of an action, movement to a position behind an object, a brief deviation from a path, or completion of an action. I propose a unified analysis of Russian prefixes, where the differences in meaning are claimed to arise from different syntactic positions, while the lexical entry of a prefix remains the same. The main focus is on the verbs of motion due to the consistent duality displayed by the prefix meanings when adde

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Zhou, Qianwen. "The Study on the Teaching of the Basic Meaning of Chinese Directional Complement for Native English Speakers." Lifelong Education 9, no. 7 (2020): 99. http://dx.doi.org/10.18282/le.v9i7.1480.

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Learning and mastering the basic meaning of the directional complement is an important content of Chinese language learning for native English speakers, and it is also an important basic knowledge for them to learn Chinese well. There exist two reasons why the directional complement is difficult to learn. On the one hand, the grammatical structure is complicated since it is not only necessary to consider whether there is an object behind the verb of the directional complement, but also the position of the object and the directional complement. On the other hand, the semantic relationship is co

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Dickey, E. C., and V. P. Dravid. "Atomic Structure Determination of Nio-Y2O3 Interfaces by HRTEM." Microscopy and Microanalysis 3, S2 (1997): 649–50. http://dx.doi.org/10.1017/s1431927600010138.

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The investigation of interfaces between NiO and Y2O3 is part of a research initiative to understand low-energy heterophase interface structures between different oxide materials. In-situ oxide composites formed by the directional solidification of pseudo-binary eutectics are used as model materials in this study because they are amenable to chemical and structural characterization at the atomic length-scale. Previously, interfaces in NiO-ZrO2(cubic) directionally solidified eutectics (DSEs) were examined by various electron imaging and spectroscopy techniques to reveal the three-dimensional in

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Zhu, Qing Feng, Zhi Hao Zhao, Yu Bo Zuo, Lei Li, and Jian Zhong Cui. "The Structure Evolution of a 99.995 Percent High Purity Aluminum during Multi-Forging Process in Room Temperature." Materials Science Forum 794-796 (June 2014): 876–81. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.876.

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In this study, a purity of 99.995percent high purity aluminum was multi-directionally forged up to a maximum cumulative strain of 4.5 at room temperature. The macro and micro structure evolution in the multi-directionally forge process was investigated by structure observations and hardness measurements. The results show that the inhomogeneous deformation of multi-directional forging results in that the structure and hardness is quite different between the easy deformation zone and stagnant zone. Dynamic recrystallization occurs in easy deformation zone of high purity aluminum sample at room t

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Isaacson, M., and O. U. Nwogu. "Wave Loads and Motions of Long Structures in Directional Seas." Journal of Offshore Mechanics and Arctic Engineering 109, no. 2 (1987): 126–32. http://dx.doi.org/10.1115/1.3257000.

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The present paper deals with the effects of wave directionality on the loads and motions of long structures. A numerical procedure based on Green’s theorem is developed to compute the exciting forces and hydrodynamic coefficients due to the interaction of a regular oblique wave train with an infinitely long, semi-immersed floating cylinder of arbitrary shape. The linear transfer function approach is used to determine the wave loads and motions of a structure of finite length in short-crested seas. The effect of wave directionality is expressed as a frequency-dependent, directionally averaged r

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