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Journal articles on the topic 'Beam orientation'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Zedel, Len, Ranjan Patro, and Tor Knutsen. "Fish behaviour and orientation-dependent backscatter in acoustic Doppler profiler data." ICES Journal of Marine Science 62, no. 6 (2005): 1191–201. http://dx.doi.org/10.1016/j.icesjms.2005.04.022.

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Abstract It is well known that fish target strength can be affected by fish behaviour. In particular, the specific orientation between a target (fish) and an echosounder system is critical in interpreting the apparent target strength. This situation is further complicated for Doppler current-profiler systems that have an array of diverging beams and where each beam will interact with targets with a different orientation. When targets themselves have random orientations, each beam will see the same range of target strengths and the average values would be the same. However, if targets such as s

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2

Wen, Qiuling, Jinhong Chen, Guoqin Huang, Changcai Cui, and Dekui Mu. "Dependence of Monocrystalline Sapphire Dicing on Crystal Orientation Using Picosecond Laser Bessel Beams." Micromachines 14, no. 4 (2023): 772. http://dx.doi.org/10.3390/mi14040772.

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Dicing is a critical step in the manufacturing process for the application of sapphire. In this work, the dependence of sapphire dicing on crystal orientation using picosecond Bessel laser beam drilling combined with mechanical cleavage was studied. By using the above method, linear cleaving with on debris and zero tapers was realized for the A1, A2, C1, C2, and M1 orientations, except for the M2 orientation. The experimental results indicated that characteristics of Bessel beam-drilled microholes, fracture loads, and fracture sections of sapphire sheets were strongly dependent on crystal orie

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3

Mohammed, Tesfaye Alemu, and Tensae Alebachew. "NUMERICAL INVESTIGATION OF AS-BUILT AND CARBON FIBER REINFORCED POLYMER RETROFITTED REINFORCED CONCRETE BEAM WITH WEB OPENINGS UNDER IMPACT LOADING." ASEAN Engineering Journal 12, no. 1 (2022): 173–82. http://dx.doi.org/10.11113/aej.v12.17521.

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It is not uncommon to provide openings in beams due to utility needs such as mechanical, electrical and sewerage passages. However, no clear guidelines are available in code of practice to handle beam web openings and presence of openings in beams changes behavior of Reinforced Concrete beam into a more complicated one. This research work investigates response of RC beam with openings under impact loading and proposes application of carbon fiber reinforced polymer (CFRP) composites to restore lost beam performance due to the presence of web openings. 3D nonlinear finite element software LS-DYN

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4

Melin, Solveig, Aylin Ahadi, and Per Hansson. "Tensile Behavior of Single-Crystal Nanosized Copper Beams with Voids." Solid State Phenomena 258 (December 2016): 53–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.53.

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The tensile response under displacement controlled loading of nanosized single crystal Cu beams, solid or holding square shaped through-the thickness voids, have been investigated through 3D molecular dynamics simulations using free-ware LAMMPS [1]. For the same beam size and void height, the void width along the beam length axis was varied. Two different crystallographic orientations were considered. It was found that, under some circumstances, voids were able to close and heal the beam cross section, causing final failure through necking in the region of the initial void. For other cases ins

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5

Han, Sheng, Hong-Ying Chen, Chih-Hsuan Cheng, Jian-Hong Lin, and Han C. Shih. "Aluminum nitride films synthesized by dual ion beam sputtering." Journal of Materials Research 19, no. 12 (2004): 3521–25. http://dx.doi.org/10.1557/jmr.2004.0451.

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Aluminum nitride films were deposited by varying the voltages of argon ion beams from 400 to 1200 V in dual ion beam sputtering. The crystal structure, microstructure, and elemental distributions of the aluminum nitride films were analyzed by x-ray diffraction, field emission scanning electron microscopy, and secondary ion mass spectroscopy, respectively. The aluminum nitride films exhibited the 〈002〉 preferred orientation at an optimal ion beam voltage of 800 V. The orientation changed to a mixture of {100} and {002} planes above 800 V, accounting for radiation damage. The thickness of the fi

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6

Viganò, Nicola, Wolfgang Ludwig, and Kees Joost Batenburg. "Reconstruction of local orientation in grains using a discrete representation of orientation space." Journal of Applied Crystallography 47, no. 6 (2014): 1826–40. http://dx.doi.org/10.1107/s1600576714020147.

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This work presents a mathematical framework for reconstruction of local orientations in grains based on near-field diffraction data acquired in X-ray diffraction contrast tomography or other variants of the monochromatic beam three-dimensional X-ray diffraction methodology. The problem of orientation reconstruction is formulated in terms of an optimization over a six-dimensional space {\bb X}^6 = {\bb R}^3 \otimes {\bb O}^{3}, constructed from the outer product of real and orientation space, and a strongly convergent first-order algorithm that makes use of modern l_1-minimization techniques is

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7

Dabwan, Abdulmajeed, Saqib Anwar, Ali M. Al-Samhan, and Mustafa M. Nasr. "On the Effect of Electron Beam Melted Ti6Al4V Part Orientations during Milling." Metals 10, no. 9 (2020): 1172. http://dx.doi.org/10.3390/met10091172.

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The machining of the electron beam melting (EBM) produced parts is a challenging task because, upon machining, different part orientations (EBM layers’ orientations) produce different surface quality even when the same machining parameters are employed. In this paper, the EBM fabricated parts are machined in three possible orientations with regard to the tool feed direction, where the three orientations are “tool movement in a layer plane” (TILP), “tool movement perpendicular to layer planes” (TLP), and “tool movement parallel to layers planes” (TPLP). The influence of the feed rate, radial de

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8

Cervantes, Yunuen, Jasmine Duchaine, Ilias Billas, Simon Duane, and Hugo Bouchard. "Monte Carlo calculation of detector perturbation and quality correction factors in a 1.5 T magnetic resonance guided radiation therapy small photon beams." Physics in Medicine & Biology 66, no. 22 (2021): 225004. http://dx.doi.org/10.1088/1361-6560/ac3344.

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Abstract Objective. With future advances in magnetic resonance imaging-guided radiation therapy, small photon beams are expected to be included regularly in clinical treatments. This study provides physical insights on detector dose-response to multiple megavoltage photon beam sizes coupled to magnetic fields and determines optimal orientations for measurements. Approach. Monte Carlo simulations determine small-cavity detector (solid-state: PTW60012 and PTW60019, ionization chambers: PTW31010, PTW31021, and PTW31022) dose-responses in water to an Elekta Unity 7 MV FFF photon beam. Investigatio

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9

Ramprasad, Gedela, and Shinigam Ramakrishna. "Residual life estimation of healthy and cracked composite beam using experimental and numerical modal analysis methods." Journal of Mechanical and Energy Engineering 4, no. 2 (2020): 127–34. http://dx.doi.org/10.30464/jmee.2020.4.2.127.

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Preventive maintenance is beneficial to minimize unexpected breakdowns in industries with continuous production. Composite structures are used for naval applications like ship hulls and marine propellers. In most of the industries, composite structural health analysis using experimental and numerical model are available for damage detection and estimate the residual life of composite beams. The present work is focusses on identification of damage and estimate residual life of composite healthy and cracked beams. Free vibrational analysis is carried out on composite beam made of glass fiber rei

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10

Desai, Saumil, and Vishal Mehta. "Effects of stacking sequences and longitudinal parameter on the dynamic characteristics of multilayer glass epoxy composite." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (2022): 012016. http://dx.doi.org/10.1088/1757-899x/1228/1/012016.

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Abstract In the current scenario, the structures made of composites are drawing attention due to their high spring rate, capacity to withstand high force, reinforcement and optimized mass. Up till now, several materials have been designed and manufactured. The components as well as structures made of these composite materials do expose to dynamic loading during their functions which leads to the failure of the respective component/structure. The dynamic characteristics depend on the material properties, physical dimension, no. of layers, orientation of the fibers and end conditions. Here an an

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11

Salih, Rania, Fangyuan Zhou, Nadeem Abbas, and Aamir Khan Mastoi. "Experimental Investigation of Reinforced Concrete Beam with Openings Strengthened Using FRP Sheets under Cyclic Load." Materials 13, no. 14 (2020): 3127. http://dx.doi.org/10.3390/ma13143127.

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In this study, the cyclic behavior of reinforced concrete (RC) beam with openings strengthened using carbon fiber-reinforced polymers (FRPs) was experimentally investigated. Seven rectangular RC beams were cast and strengthened through external bonding of carbon fiber-reinforced polymer (CFRP) sheets around the beam web opening with different orientations to evaluate the maximum resistance, secant stiffness, strength degradation, ductility, energy dissipation capacity and behavior of the specimens’ failure mode under cyclic load. One solid beam without an opening (i.e., control specimen) and s

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12

Danielson, D. A., and D. H. Hodges. "Nonlinear Beam Kinematics by Decomposition of the Rotation Tensor." Journal of Applied Mechanics 54, no. 2 (1987): 258–62. http://dx.doi.org/10.1115/1.3173004.

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A simple matrix expression is obtained for the strain components of a beam in which the displacements and rotations are large. The only restrictions are on the magnitudes of the strain and of the local rotation, a newly-identified kinematical quantity. The local rotation is defined as the change of orientation of material elements relative to the change of orientation of the beam reference triad. The vectors and tensors in the theory are resolved along orthogonal triads of base vectors centered along the undeformed and deformed beam reference axes, so Cartesian tensor notation is used. Althoug

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13

Liu, Danhua, Changda Zhou, Peiyao Lu, Jilian Xu, Zhiyuan Yue, and Shuyun Teng. "Generation of vector beams with different polarization singularities based on metasurfaces." New Journal of Physics 24, no. 4 (2022): 043022. http://dx.doi.org/10.1088/1367-2630/ac60dd.

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Abstract In view of wide applications of vector beams and powerful light manipulation ability of metasurfaces, this paper studies the generation of two kinds of vector beams with different polarization singularities based on metasurfaces. One kind of vector beams are the linearly polarized vector beam with uncertain polarization orientation and the other kind of vector beams are the elliptically polarized vector beam with hybrid polarization states with uncertain polarization orientation, ellipticity and handedness. These vector beams can be decomposed into two or more uniform polarization sta

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14

Kim, Cheol Woong, Sang Heon Lee, and Kee Joo Kim. "Modified Bernoulli-Euler Laminate Beam Theory Using Total Effective Moment in LIPCA." Key Engineering Materials 334-335 (March 2007): 413–16. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.413.

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The applicable bending moment equation of LIPCA is necessary even though the fiber layer ply orientation is changed. The aim of this research is to evaluate the relationship between the total effective moment (ME) and Bernoulli-Euler bending moment (M) when the ply orientations of unidirectional CFRP, which is one of the various laminate configurations in LIPCA, are changed. Since the related previous equation between the performance stroke range (h) and the radius of curvature (ρ) was just applicable to the CFRP ply orientation [0], it will be modified using these results. The related modifie

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15

Bertier, Paul, and Brianna R. Heazlewood. "Fringe fields are important when examining molecular orientation in a cold ammonia beam." Journal of Physics B: Atomic, Molecular and Optical Physics 54, no. 20 (2021): 205101. http://dx.doi.org/10.1088/1361-6455/ac34dc.

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Abstract External fields have been widely adopted to control and manipulate the properties of gas-phase molecular species. In particular, electric fields have been shown to focus, filter and decelerate beams of polar molecules. While there are several well-established approaches for controlling the velocity and quantum-state distribution of reactant molecules, very few of these methods have examined the orientation of molecules in the resulting beam. Here we show that a buffer gas cell and three-bend electrostatic guide (coupled to a time-of-flight set-up) can be configured such that 70% of am

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16

Yaduvanshi, Rajveer S., Richa Gupta, and Saurabh Katiyar. "Smart DRA for beam width and orientation control." Frequenz 74, no. 11-12 (2020): 383–92. http://dx.doi.org/10.1515/freq-2020-0013.

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AbstractSmartdielectric resonator antenna (DRA) having beam control mechanism is anew area to be explored by antenna researchers. Proposed new geometry DRA has low loss, design flexibility, high efficiency, compact size and desired radiated beam control. Developing beam control in new geometry DRAs is investigated for the first time in this letter. Unique technique for beam control and beam width control is proposed using pit top and mount top DRA. Gain is controlled from 5.0 to 9.98 dBi and beam is controlled from ±30° to ±70° in broadside radiation pattern. U shape pit DRA has maximum direct

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17

Li, J., and C. Yu. "Simultaneous optimization of beam intensity and beam orientation for IMRT." International Journal of Radiation Oncology*Biology*Physics 51, no. 3 (2001): 73–74. http://dx.doi.org/10.1016/s0360-3016(01)01959-9.

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18

Onyia, M. E., and S. O. Ole. "Assessment of Flexural Strengths and Flexural Load Bearing Capacity of Bamboo Grids-Reinforced Soil Beam." Journal of Applied Sciences and Environmental Management 28, no. 2 (2024): 339–44. http://dx.doi.org/10.4314/jasem.v28i2.6.

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Soil improvement techniques have become a major solution to soil related problems. Thus, this paper aims to determine the flexural strengths and flexural load bearing capacity of bamboo grids-reinforced soil beam using standard methods and experiments at 7 days, 14 days, 21 days and, 28 days curing ages. The findings of this study showed that the mean flexural strength of uniaxial bamboo grid reinforced soil beam gave 3.50 N/mm² while flexural strength of biaxial bamboo grid reinforced soil beam gave 3.86 N/mm². The result indicates that biaxial bamboo reinforced soil beam has the tendency to

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19

Murad, Yasmin. "An experimental study on flexural strengthening of RC beams using CFRP sheets." International Journal of Engineering & Technology 7, no. 4 (2018): 2075. http://dx.doi.org/10.14419/ijet.v7i4.16546.

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The use of carbon fiber reinforced polymer (CFRP) sheets is becoming a widely accepted solution for strengthening and repairing rein-forced concrete (RC) structures. To date, the behavior of RC beams, strengthened with 60˚ and 45˚ inclined CFRP sheets, has not clearly explained. An experimental program is proposed in this paper to investigate the flexural behavior of RC beams strengthened with CFRP sheets. CFRP sheets were epoxy bonded to the tension face to enhance the flexural strength of beams inducing different orientation angles of 0˚, 45˚, 60˚ and 90˚ with the beam longitudinal axis. The

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20

Tao, Xiaodong, and Alwyn Eades. "Another Way to Implement Diffraction Contrast in SEM." Microscopy Today 11, no. 2 (2003): 36–38. http://dx.doi.org/10.1017/s1551929500052482.

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SEM users are familiar with two forms of contrast in SEM images: topographic contrast and atomic number contrast. We can now add a third form of contrast. Contrast can arise due to the different orientation of grains in the sample. However, in normal operation this con trast is very weak, since in the SEM the beam includes a range of incident angles. This has the effect of averaging out diffraction contrast from the different orientations of the grains. This contrast is generally much stronger when the trast is very weak, since in the SEM the beam includes a range of incident angles. This has

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21

Kinyaevskiy, Igor O., Valery I. Kovalev, Nikita S. Semin, et al. "Two-Photon Absorption in Ca3(VO4)2 and Ca2.7Sr0.3(VO4)2 Crystals." Photonics 10, no. 4 (2023): 466. http://dx.doi.org/10.3390/photonics10040466.

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Two-photon absorption has been systematically studied in Ca3(VO4)2 and Ca2.7Sr0.3(VO4)2 crystals, both of which are prospective nonlinear optical and laser host materials. A strong dependence of the two-photon absorption coefficients on the orientation of the laser beam polarization with respect to the optical c-axis of the crystals is revealed. The measured coefficients for perpendicular and parallel orientations were 50 ± 10 cm/TW and 19 ± 4 cm/TW in Ca3(VO4)2, and 18 ± 3 cm/TW and 10 ± 2 cm/TW in Ca2.7Sr0.3(VO4)2, respectively. Thus, to minimize optical losses caused by two-photon absorptio

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22

Kabir, Mohammad Z., and Archibald N. Sherbourne. "Shear strain effects on flexure and torsion of thin-walled pultruded composite beams." Canadian Journal of Civil Engineering 26, no. 6 (1999): 852–68. http://dx.doi.org/10.1139/l99-035.

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The paper presents a theoretical study on the static structural response of thin-walled composite open-section beams. Based on a Vlasov-type linear hypothesis, a beam theory is formulated in terms of in-plane elastic properties to analyze composite I and channel section pultruded beams which includes the transverse shear deformation of the beam cross section. The importance of the shear influence on the total vertical deflection is reported. Symmetric lay-up composite beams result in a bending-twisting structural coupling. The optimal fibre orientation for minimizing vertical displacements and

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23

Poignant, Floriane, Ianik Plante, Zarana S. Patel, Janice L. Huff, and Tony C. Slaba. "Geometrical Properties of the Nucleus and Chromosome Intermingling Are Possible Major Parameters of Chromosome Aberration Formation." International Journal of Molecular Sciences 23, no. 15 (2022): 8638. http://dx.doi.org/10.3390/ijms23158638.

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Ionizing radiation causes chromosome aberrations, which are possible biomarkers to assess space radiation cancer risks. Using the Monte Carlo codes Relativistic Ion Tracks (RITRACKS) and Radiation-Induced Tracks, Chromosome Aberrations, Repair and Damage (RITCARD), we investigated how geometrical properties of the cell nucleus, irradiated with ion beams of linear energy transfer (LET) ranging from 0.22 keV/μm to 195 keV/μm, influence the yield of simple and complex exchanges. We focused on the effect of (1) nuclear volume by considering spherical nuclei of varying radii; (2) nuclear shape by c

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24

Borowiec, Marek, Jaroslaw Gawryluk, and Marcin Bochenski. "Influence of Mechanical Couplings on the Dynamical Behavior and Energy Harvesting of a Composite Structure." Polymers 13, no. 1 (2020): 66. http://dx.doi.org/10.3390/polym13010066.

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In this paper, the dynamical behavior of composite material is analyzed, including the energy harvesting effect. The composite is modeled by the Finite Element Method (FEM) and is made of pre-impregnate with a matrix of thermosetting epoxy resin reinforced with high-strength R-type glass fibers, and it is designed as a beam structure that is exposed to mechanical vibrations. The structure assumed the form of a beam with a substantially rectangular cross section. The couplings of motion occurring between mode shapes at properly selected fiber orientations are investigated. The beams with determ

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25

Bieda, Magdalena. "Investigations of Fine Grained Metallic Materials by Means of Orientation Maps in Transmission Electron Microscope." Solid State Phenomena 186 (March 2012): 53–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.186.53.

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New subdivision of microscopic investigation called Orientation Microscopy (OM) is already well known in scanning electron microscope (SEM). Needs for investigation in nanoscale contribute to development of an appropriate method for transmission electron microscope (TEM). Automated acquisition and indexing of diffraction patterns, necessary for creation of orientation maps in TEM, cause more difficulties then in SEM. Nevertheless, the techniques of OM are also being developed in the Transmission Electron Microscope (TEM). Microdiffraction has been successfully introduced for creating such maps

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26

Akbaş, Şeref Doğuşcan. "Hygrothermal Post-Buckling Analysis of Laminated Composite Beams." International Journal of Applied Mechanics 11, no. 01 (2019): 1950009. http://dx.doi.org/10.1142/s1758825119500091.

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The main goal in this paper is to make analysis of post-buckling of laminated composite beams under hygrothermal effect. In solution of problem, finite element method is utilized with the first shear beam theory. Total Lagrangian approach is used nonlinear kinematic relations. It is known that post-buckling problems are geometrically nonlinear problems. In nonlinear solution of problem, the Newton–Raphson method is used based on incremental displacement. The novelty in this study is to investigate the hygrothermal post-buckling analysis of laminated composite beams by using total Lagrangian no

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27

Lijia, Yang, Liu Yili, Wang Zhonglie, and Li Hengde. "Ion-beam induced orientation growth of PtSi." Vacuum 39, no. 2-4 (1989): 227–29. http://dx.doi.org/10.1016/0042-207x(89)90204-2.

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28

Gokhale, P., E. M. A. Hussein, and N. Kulkarni. "Determination of beam orientation in radiotherapy planning." Medical Physics 21, no. 3 (1994): 393–400. http://dx.doi.org/10.1118/1.597304.

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29

Steinbrecher, Ivo, Alexander Popp, and Christoph Meier. "Consistent coupling of positions and rotations for embedding 1D Cosserat beams into 3D solid volumes." Computational Mechanics 69, no. 3 (2021): 701–32. http://dx.doi.org/10.1007/s00466-021-02111-4.

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AbstractThe present article proposes a mortar-type finite element formulation for consistently embedding curved, slender beams into 3D solid volumes. Following the fundamental kinematic assumption of undeformable cross-section s, the beams are identified as 1D Cosserat continua with pointwise six (translational and rotational) degrees of freedom describing the cross-section (centroid) position and orientation. A consistent 1D-3D coupling scheme for this problem type is proposed, requiring to enforce both positional and rotational constraints. Since Boltzmann continua exhibit no inherent rotati

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30

Chemami, Abdennacer, Youcef Khadri, Sabiha Tekili, El Mostafa Daya, Ali Daouadji, and Zitouni Azari. "Damped dynamic response of strengthened beams by composite coats under moving force by FEM." Matériaux & Techniques 106, no. 2 (2018): 206. http://dx.doi.org/10.1051/mattech/2018025.

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This paper presents a numerical study of the free and damped forced vibration of simply-supported beams with composite coats subjected to a moving load by use of finite elements method. Three types of beam configurations, aluminum, composite and strengthened beam are investigated. The equation of motion of the beam is solved using the modal superposition method and integrated by applying the Newmark time integration procedure. Good agreements were achieved between the FEM and analytical solutions. The damped dynamic response, critical velocities and the dynamic amplification factor of the beam

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31

Dong, L., D. J. Srolovitz, G. S. Was, Q. Zhao, and A. D. Rollett. "Combined out-of-plane and in-plane texture control in thin films using ion beam assisted deposition." Journal of Materials Research 16, no. 1 (2001): 210–16. http://dx.doi.org/10.1557/jmr.2001.0033.

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Complete control of the texture of a film during growth requires the ability to determine the in-plane and out-of-plane texture simultaneously. We present both computer simulation and experimental evidence for the simultaneous establishment of out-of-plane and in-plane texture during ion beam assisted deposition of aluminum. Channeling along 〈110〉 directions (60° from the normal) creates a {220} out-of-plane orientation rather than the thermodynamically preferred {111} orientation. The ion beam also aligned 〈220〉 directions within the plane of the film. Measured x-ray pole figures confirmed th

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32

Davies, Robert, and Valerie Randlè. "Application of Crystal Orientation Mapping to Intra-Grain Misorientations." Microscopy and Microanalysis 3, S2 (1997): 563–64. http://dx.doi.org/10.1017/s1431927600009703.

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Crystal orientation mapping (COM), which is also referred to as orientation imaging microscopy (OIM), is a powerful tool which opens up enormous possibilities for investigation of materials. The principle of COM is that the microstructure is displayed or mapped according to the orientation of sampled volumes of crystal. These data are obtained in the scanning electron microscope by moving either the electron beam or the specimen stage through predetermined steps and collecting an electron back-scatter diffraction (EBSD) pattern. Typically, a null orientation is represented by a black pixel and

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33

Hayashi, Yujiro, Yoshiharu Hirose, and Yoshiki Seno. "Polycrystal orientation mapping using scanning three-dimensional X-ray diffraction microscopy." Journal of Applied Crystallography 48, no. 4 (2015): 1094–101. http://dx.doi.org/10.1107/s1600576715009899.

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A modified three-dimensional X-ray diffraction (3DXRD) technique is proposed as a solution to the main problem with 3DXRD-type experiments, namely, polycrystalline diffraction spot overlap. The modified method, termed scanning 3DXRD, enables three-dimensional crystallographic orientation mapping in polycrystals using a narrow incident X-ray beam with a beam size sufficiently smaller than the average grain size. This method can potentially allow one to apply a 3DXRD-type technique to specimens with a larger number of grains. Moreover, because of the use of a far-field area detector, scanning 3D

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34

Hayden, Victor C., and Luc Y. Beaulieu. "Modeling Rectangular Cantilevers during Torsion and Deflection for Application to Frictional Force Microscopy." Microscopy and Microanalysis 15, no. 3 (2009): 259–64. http://dx.doi.org/10.1017/s1431927609090382.

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AbstractA numerical and experimental analysis of the optical beam deflection system used to monitor microcantilevers subjected to simultaneous deflection and twisting such as in lateral or frictional force microscopy was performed. This study focused on two optical beam deflection orientations where in the first case the optical beam and the detector are at a right angle to the length of the cantilever and the second case, which is the more standard orientation, the optical beam is parallel to the length of the lever. This study finds that it is possible to model the twist and the deflection s

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35

Alsadik, Bashar. "Performance Assessment of Mobile Laser Scanning Systems Using Velodyne Hdl-32e." Surveying and Geospatial Engineering Journal 1, no. 1 (2021): 28–33. http://dx.doi.org/10.38094/sgej116.

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Mapping systems using multi-beam LiDARs are widely used nowadays for different geospatial applications graduating from indoor projects to outdoor city-wide projects. These mobile mapping systems can be either ground-based or aerial-based systems and are mostly equipped with inertial navigation systems INS. The Velodyne HDL-32 LiDAR is a well-known 360° spinning multi-beam laser scanner that is widely used in outdoor and indoor mobile mapping systems. The performance of such LiDARs is an ongoing research topic which is quite important for the quality assurance and quality control topic. The per

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Alsadik, Bashar. "Performance Assessment of Mobile Laser Scanning Systems Using Velodyne Hdl-32e." Journal of Geoinformatics & Environmental Research 3, no. 01 (2022): 01–09. http://dx.doi.org/10.38094/jgier30142.

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Mapping systems using multi-beam LiDARs are widely used nowadays for different geospatial applications graduating from indoor projects to outdoor city-wide projects. These mobile mapping systems can be either ground-based or aerial-based systems and are mostly equipped with inertial navigation systems INS. The Velodyne HDL-32 LiDAR is a well-known 360° spinning multi-beam laser scanner that is widely used in outdoor and indoor mobile mapping systems. The performance of such LiDARs is an ongoing research topic which is quite important for the quality assurance and quality control topic. The per

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37

Alsadik, Bashar. "Performance Assessment of Mobile Laser Scanning Systems Using Velodyne Hdl-32e." Journal of Civil Engineering Frontiers 5, no. 01 (2024): 7–12. http://dx.doi.org/10.38094/jocef50177.

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Mapping systems using multi-beam LiDARs are widely used nowadays for different geospatial applications graduating from indoor projects to outdoor city-wide projects. These mobile mapping systems can be either ground-based or aerial-based systems and are mostly equipped with inertial navigation systems INS. The Velodyne HDL-32 LiDAR is a well-known 360° spinning multi-beam laser scanner that is widely used in outdoor and indoor mobile mapping systems. The performance of such LiDARs is an ongoing research topic which is quite important for the quality assurance and quality control topic. The per

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Ali, Hasan Hussein, and Abdulmuttailb I. Said. "Experimental Study on the Performance of Concrete Beams Including Holes Reinforced with Glass Fiber Polymer." E3S Web of Conferences 427 (2023): 02010. http://dx.doi.org/10.1051/e3sconf/202342702010.

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This paper carried out An examination of the performance characteristics of concrete beams including openings that were reinforced with Glass Fiber Reinforced Polymer (GFRP) bars. This investigation studied five reinforced concrete (RC) beams with both longitudinal and transverse GFRP reinforcement with openings in two directions (horizontal and vertical) were studied. Both the orientation of the openings and the number of openings were considered to be the main parameters in this research. These holes are located in the beams' flexural region. The results demonstrate that relative to the refe

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Ren, Yong Sheng, and Xiang Hong Du. "Nonlinear Model of Thin-Walled Composite Beams with Moderate Deflections." Applied Mechanics and Materials 29-32 (August 2010): 22–27. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.22.

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A geometrically nonlinear model for thin-walled, single-cell composite beams is developed by using variational formulation and the variational-asympotical method. The structural modeling is split into two parts: a two-dimensional analysis over the cross section, and a geometrically nonlinear analysis of a beam along the beam span. The nonlinear model is based on the assumption of moderate beam deflection, accounting for the pitch angle and extends the linear analysis model for anisotropic thin-walled beams. By employing the Galerkin’s method, an nonlinear algebraic equations is derived and the

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Kovalev, Alexey A., Victor V. Kotlyar, and Darya S. Kalinkina. "Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum." Photonics 8, no. 6 (2021): 190. http://dx.doi.org/10.3390/photonics8060190.

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We studied paraxial light beams, obtained by a continuous superposition of off-axis Gaussian beams with their phases chosen so that the whole superposition is invariant to free-space propagation, i.e., does not change its transverse intensity shape. Solving a system of five nonlinear equations for such superpositions, we obtained an analytical expression for a propagation-invariant off-axis elliptic Gaussian beam. For such an elliptic beam, an analytical expression was derived for the orbital angular momentum, which was shown to consist of two terms. The first one is intrinsic and describes th

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Rafael Velayarce, Jorge, and Christian Motz. "Effect of Sample Size and Crystal Orientation on the Fatigue Behaviour of Single Crystalline Microbeams." Materials 13, no. 3 (2020): 741. http://dx.doi.org/10.3390/ma13030741.

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Beam deflection experiments were used to systematically examine size effects on the low cyclic fatigue (LCF) deformation behaviour of micro-sized bending beams of copper (Cu) single crystals oriented for single slip, critical and coplanar double slip. We present cyclic hardening curves and fatigue surface roughness, as well as dislocations structures of the micro-sized beams with sizes between 1 and 15 µm. A clear crystal orientation and size effect on the cyclic hardening curves, surface roughness, and the dislocation microstructures were observed. Based on the experimental results, the fatig

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Messerschmidt, A., and J. W. Pflugrath. "Crystal orientation and X-ray pattern prediction routines for area-detector diffractometer systems in macromolecular crystallography." Journal of Applied Crystallography 20, no. 4 (1987): 306–15. http://dx.doi.org/10.1107/s002188988708662x.

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Routines for crystal orientation and the prediction of expected reflections which are part of the data collection software package MADNES for area-detector diffractometer systems in macromolecular crystallography are described. This package is designed to be area-detector-system independent. In addition to refining crystal cell lengths and angles, crystal orientation, crystal-to-detector distance, position of the primary beam on the detector, and rotation of the detector around the primary beam, the orientation routine also refines the effective mosaic spread of the crystal, the beam inclinati

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Sabiha, Tekili, Khadri Youcef, and Merzoug Bachir. "Free Vibration Analysis of the Strengthened Beams by Composite Coats." Advanced Materials Research 716 (July 2013): 595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.716.595.

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The analysis of free vibration of simply-supported lamineted composite coated beams is investigated. With a core made from an isotropic material (steel) and faces made from composite material, (glass/epoxy and carbon/epoxy), two sandwich beam models are used in the study. For this purpose, a computer code is developed using MATLAB to perform the analysis of free-vibration of strengthened beams by composite coats. The effects of the variation of different parameters such as the span/depth ratio, fiber orientation angle of the coat, and thickness ratio on natural frequencies and of the beam are

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Tuan, Vu Anh, Han Ngoc Duc, Nguyen Dinh Hoa, Nguyen Tran Hieu, and Nguyen Trung Kien. "A new type of hollow-shallow steel and concrete composite floor beam." Journal of Science and Technology in Civil Engineering (STCE) - HUCE 15, no. 4 (2021): 65–73. http://dx.doi.org/10.31814/stce.huce(nuce)2021-15(4)-06.

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Recently in Vietnam, steel-concrete composite structures especially composite beams are widely constructed in high-rise buildings. To apply broader in construction field mainly in secondary beam systems, the new type of slim-floor composite beam is proposed to aim at reducing the cost, saving the raw material, and decreasing the overall floor depth for sustainable development orientation. This type of floor beam structure consists of built-up hollow-shallow steel beam mandatory connected with cast in situ concrete slab through the openings at both side of web along the beam. The shear connecti

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Puchegger, Stephan, Dieter Loidl, Herwig Peterlik, and Karl Kromp. "Determination of Elastic Modules in Dependence on Orientation by the Resonant Beam Technique." Materials Science Forum 514-516 (May 2006): 815–24. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.815.

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A novel procedure, based on the Resonant Beam Technique, and its application to anisotropic composites is presented. The evaluation of the elastic modules of anisotropic materials from the measurement of the transverse eigenfrequency spectra of resonant beams is performed by a two step process: firstly the beams cut out from the test material in different directions are evaluated in-dependently of each other under the assumption, that they are isotropic, solving Timoshenko´s equations using an isotropic correction factor for shear. Secondly the beams are evaluated together as representatives o

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Tegze, Miklós, and Gábor Bortel. "Incorporating particle symmetry into orientation determination in single-particle imaging." Acta Crystallographica Section A Foundations and Advances 74, no. 5 (2018): 512–17. http://dx.doi.org/10.1107/s2053273318008999.

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In coherent-diffraction-imaging experiments X-ray diffraction patterns of identical particles are recorded. The particles are injected into the X-ray free-electron laser (XFEL) beam in random orientations. If the particle has symmetry, finding the orientation of a pattern can be ambiguous. With some modifications, the correlation-maximization method can find the relative orientations of the diffraction patterns for the case of symmetric particles as well. After convergence, the correlation maps show the symmetry of the particle and can be used to determine the symmetry elements and their orien

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Xu, Genbao, M. Meshii, and P. R. Okamoto. "The orientation effect on amorphization in CoTi under 1 MeV electron irradiation." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1126–27. http://dx.doi.org/10.1017/s0424820100089949.

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Since the first report of electron irradiation induced amorphization in 1982, this phenomenon has been characterized in many aspects. The effects of the dose and temperature, the mass of the incident beam, the deviation from stoichiometry and the electron flux, have been studied. There is, however, no systematic study has been reported on the crystallographic orientation effects. This paper will report the orientation effect on amorphization of intermetallic compound CoTi irradiated by 1 MeV electrons.An alloy button of Co-45 at.% Ti was prepared by arc-melting and subsequently annealed at 110

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Dabwan, Abdulmajeed, Saqib Anwar, Ali M. Al-Samhan, et al. "CNC Turning of an Additively Manufactured Complex Profile Ti6Al4V Component Considering the Effect of Layer Orientations." Processes 11, no. 4 (2023): 1031. http://dx.doi.org/10.3390/pr11041031.

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Electron beam melting (EBM) is one example of a 3D printing technology that has shown great promise and advantages in the fabrication of medical devices such as dental and orthopedic implants. However, these products require high surface quality control to meet the specifications; thus, post-processing, such as with machining processes, is required to improve surface quality. This paper investigates the influence of two-part orientations of Ti6Al4V EBM parts on the CNC machining (turning) process. The two possible EBM part orientations used in this work are across EBM layers (AL) and parallel

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Hu, Hao, Yingcai Zheng, Xinding Fang, and Michael C. Fehler. "3D seismic characterization of fractures with random spacing using the double-beam method." GEOPHYSICS 83, no. 5 (2018): M63—M74. http://dx.doi.org/10.1190/geo2017-0739.1.

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Obtaining information on the spatial distribution of subsurface natural and induced fractures is critical in the production of geothermal or hydrocarbon fluids. Traditional seismic characterization methods for subsurface fractures are based on the assumption of effective anisotropy medium theory, which may not be true in reality when the fracture distribution is random. We have tested the recently proposed double-beam method to characterize nonuniformly distributed fractures. We built a 3D layered reservoir model; the reservoir layer was geometrically irregular, and it contained a set of rando

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Pilkey, Walter D., and Levent Kitiş. "Dynamic Stiffness Matrix for a Beam Element with Shear Deformation." Shock and Vibration 2, no. 2 (1995): 155–62. http://dx.doi.org/10.1155/1995/486972.

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A method for calculating the dynamic transfer and stiffness matrices for a straight Timoshenko shear beam is presented. The method is applicable to beams with arbitrarily shaped cross sections and places no restrictions on the orientation of the element coordinate system axes in the plane of the cross section. These new matrices are needed because, for a Timoshenko beam with an arbitrarily shaped cross section, deflections due to shear in the two perpendicular planes are coupled even when the coordinate axes are chosen to be parallel to the principal axes of inertia.

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