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Journal articles on the topic 'Gravity Hinge'

Author: Grafiati

Published: 25 June 2021

Last updated: 29 July 2025

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1

Chen, Xingyu, Liye Zhao, Jiawen Xu, and Zhikang Liu. "An Improved Analytical Model of a Thrust Stand with a Flexure Hinge Structure Considering Stiffness Drift and Rotation Center Offset." Actuators 13, no. 1 (2024): 21. http://dx.doi.org/10.3390/act13010021.

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Micro-newton thrust stands are widely used in thruster ground calibration procedures for a variety of space missions. The conventional analytical model does not consider the gravity-induced extension effect and systematic error in displacement for thrust stands consisting of hanging pendulums based on flexure hinge structures. This paper proposes an improved analytical model of a hanging pendulum for thrust measurement, where an elliptical notched flexure hinge is the key component. A parametric model of the bending stiffness of the flexure hinge is developed. Equally, both the bending stiffne

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2

Kim, Hyo Young, Jung Jae Kim, Da Hoon Ahn, Dae Gab Gweon, Chan Gon Park, and Dong Pyo Hong. "Analysis of a 3-DOF Rotationally Symmetric Hinge." Applied Mechanics and Materials 284-287 (January 2013): 597–600. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.597.

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Flexure hinges have been widely used as mechanisms for high precision positioning stages that have a micrometer or nanometer resolution. This paper describes the analysis of a 3-DOF rotationally symmetric hinge for the vertical mask aligner stage. The vertical mask aligner stage was designed to overcome the bending of masks by gravity. In order to align the mask and the wafer, the vertical mask aligner stage has one linear motion and yaw rotating motions (Z, Θx, Θy). The new vertical mask aligner stage will try to use rotationally symmetric hinges. These rotationally symmetric hinges would act

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3

Fenwick, Richard, Raad Dely, and Barry Davidson. "Ductility demand for uni-directional and reversing plastic hinges in ductile moment resisting frames." Bulletin of the New Zealand Society for Earthquake Engineering 32, no. 1 (1999): 1–12. http://dx.doi.org/10.5459/bnzsee.32.1.1-12.

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In a major earthquake the beams in moment resisting frames may develop either reversing or unidirectional plastic hinges. The form of plastic hinge depends upon the ratio of the moments induced by the gravity loading to those induced by the seismic actions. Where this ratio is low the plastic hinges form at the ends of the beams and the sign of the inelastic rotation changes with the direction of sway. These are reversing plastic hinges, and the magnitude of the rotation that they sustained is closely related to the inter-storey displacement. However, when the moment ratio exceeds a certain cr

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4

Saenkhum, Nattapon, and Tassanai Sanponpute. "The improvement of an elastic hinge-type torque standard machine in NIMT." ACTA IMEKO 8, no. 3 (2019): 36. http://dx.doi.org/10.21014/acta_imeko.v8i3.668.

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<p class="Abstract" align="left">The National Institute of Metrology of Thailand’s (NIMT) strain-controlled elastic hinge-type torque standard machine was designed to cover a measuring range of 1 N·m to 1 kN·m. The elastic hinge was used both at the fulcrum and the hanger of the lever arms. The designed elastic hinge’s thickness, 0.50 mm, caused a higher stiffness than a sheet metal plate of other types of torque machines. The bending moment of all elastic hinges affected the sum of the torque signal on the lever arm that was used to observe the balancing of the lever. The residual torqu

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5

GABRIELE GIONTI, S. J. "SOME CONSIDERATIONS ON DISCRETE QUANTUM GRAVITY." International Journal of Geometric Methods in Modern Physics 09, no. 02 (2012): 1260013. http://dx.doi.org/10.1142/s0219887812600134.

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Recent results in Local Regge Calculus are confronted with Spin-Foam Formalism. Introducing Barrett–Crane Quantization in Local Regge Calculus makes it possible to associate a unique Spin jh with an hinge h, fulfilling one of the requirements of Spin-Foam definition. It is shown that inter-twiner terms of Spin-Foam can follow from the closure constraint in Local Regge Calculus.

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6

Hassan, Soha, Mohamed Sultan, Mohamed Sobh, et al. "Crustal Structure of the Nile Delta: Interpretation of Seismic-Constrained Satellite-Based Gravity Data." Remote Sensing 13, no. 10 (2021): 1934. http://dx.doi.org/10.3390/rs13101934.

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Interpretations of the tectonic setting of the Nile Delta of Egypt and its offshore extension are challenged by the thick sedimentary cover that conceals the underlying structures and by the paucity of deep seismic data and boreholes. A crustal thickness model, constrained by available seismic and geological data, was constructed for the Nile Delta by inversion of satellite gravity data (GOCO06s), and a two-dimensional (2D) forward density model was generated along the Delta’s entire length. Modelling results reveal the following: (1) the Nile Delta is formed of two distinctive crustal units:

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Hasan, Mohammad Nurul, Md Noor Islam, and Salma Begum. "Geophysical interpretation of tectonic features in Bangladesh." Journal of Nepal Geological Society 18 (December 1, 1998): 135–41. http://dx.doi.org/10.3126/jngs.v18i0.32205.

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Bangladesh occupies the major part of the Bengal basin. It is mainly a plain fluvi-dieltaic land. Except the eastern and northeastern Tertiary hilly region, the whole country is covered with thick Quaternary sediments. Tectonic features in Bangladesh, except the eastern and northeastern hilly structures, are hidden under thick cover of sediments. Gravity anomalies dearly show the locations of major subsurface tectonic features of the country, namely a) Himalayan foredeep, b) Rangpur platform, c) Hinge zone, d) Surma basin and e) Bengal foredeep. Magnetic anomalies and the seismic section

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8

Kobayashi, Ryosuke, Shinitiro Nishida, and Shintaro Nakatani. "Study of Mars Rover with Hinge Type Center of Gravity Movement Mechanism." Proceedings of Conference of Chugoku-Shikoku Branch 2018.56 (2018): 1307. http://dx.doi.org/10.1299/jsmecs.2018.56.1307.

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9

Rezavandi, Arash, and Chung C. Fu. "Response of irregular lightly reinforced concrete frame structures in low seismic zones." Advances in Structural Engineering 20, no. 4 (2016): 519–33. http://dx.doi.org/10.1177/1369433216655921.

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This article evaluates the performance of lightly reinforced concrete frames in low seismic zones. The frames under evaluation contain vertical and/or plane irregularities and are designed for gravity loads only. Nonlinear time history analysis using scaled ground motions and pushover procedure as a supplemental method is performed in this study. With the adoption of plastic hinge method, damage levels are addressed according to FEMA 356 definitions. The pivot model is considered for hysteresis behavior. The damage stage and number of formed hinges are classified for the beams and columns. A c

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10

Xu, Hao, Jinglong Han, Haiwei Yun, and Xiaomao Chen. "Calculation of the Hinge Moments of a Folding Wing Aircraft during the Flight-Folding Process." International Journal of Aerospace Engineering 2019 (September 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/9362629.

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A folding wing morphing aircraft should complete the folding and unfolding process of its wings while in flight. Calculating the hinge moments during the morphing process is a critical aspect of a folding wing design. Most previous studies on this problem have adopted steady-state or quasi-steady-state methods, which do not simulate the free-flying morphing process. In this study, we construct an aeroelastic flight simulation platform based on the secondary development of ADAMS software to simulate the flight-folding process of a folding wing aircraft. A flexible multibody dynamic model of the

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11

Samimi, Razieh, and Seyed Rasoul Mirghaderi. "Buckling Behavior of Through-Plates under Gravity Loads." Applied Mechanics and Materials 105-107 (September 2011): 2183–87. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.2183.

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Due to the development in the construction and building industry in recent years, numerous methods for safer, easier and more economical design of structures have been studied.Because of the high bi-axial bending capacity and high compressive strength of hollow structural sections, these sections are considered as a popular alternative by designers. Supporting the panel zone demands in the columns and occurring the moment hinge at the ends of beam are too available in column with hollow section. One of the major problems in the way of using these sections is lack of appropriate load path to co

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12

Adebar, Perry, Poureya Bazargani, James Mutrie, and Denis Mitchell. "Safety of gravity-load columns in shear wall buildings designed to Canadian standard CSA A23.3." Canadian Journal of Civil Engineering 37, no. 11 (2010): 1451–61. http://dx.doi.org/10.1139/l10-075.

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It has been a Canadian code requirement for 25 years to check whether concrete gravity-load columns can tolerate the building deformations due to the design earthquake; but the way this has typically been done using linear analysis significantly underestimates the seismic demands on gravity-load columns. Concern about the safety of gravity-load columns over the plastic hinge height of concrete shear walls, particularly elongated wall-like gravity-load columns, has resulted in new design requirements in Update No. 3 of Canadian Standard Association (CSA) A23.3–04 issued in August 2009. The curr

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13

Wang, Xinyuan, Yongtao Shui, Chaozheng Wang, Dezheng Yin, and Hongjuan Ji. "Analysis of the influence of clearance on bending stiffness of space deployable mechanism in the locked state." Journal of Physics: Conference Series 2419, no. 1 (2023): 012014. http://dx.doi.org/10.1088/1742-6596/2419/1/012014.

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Abstract The future space station, which can simulate the gravity environment by rotation, has attracted the attention of scholars in recent years. It is considered a feasible scheme to fold the mechanism on the ground and assemble it into an artificial gravity ring after entering orbit. The deployable mechanism used to attach the space station is required to be large-scale and sufficiently high stiffness after deployment to ensure the safety and accuracy of the payload. However, the clearance will significantly reduce the stiffness of the mechanism, which is in the locked state. In this paper

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14

Li, Zhi Lai. "Structural Design of Large Aperture Rectangular Mirror for Space Telescope." Applied Mechanics and Materials 256-259 (December 2012): 855–58. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.855.

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Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness, strength and thermal dimensional stability, some factors such as support scheme, materials selection, lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge, influences of gravity, assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) re

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15

Wen, Zhao Dong, Ming Yan, and Lei Zhang. "Motion of Transverse Shock Tester Guided by Parallelogram Mechanism." Applied Mechanics and Materials 716-717 (December 2014): 590–94. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.590.

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The transverse shock tester is an important device to assess the shock resistance ability of ship equipments. Because of the shock point and the gravity center of the tester are not on the same horizontal, the device may generate huge overturning moment. We adopt the finite element method to do the dynamics analysis of the transverse shock tester, using the parallelogram mechanism as its guide device, to analysis its output waveform and other problems, and find: it will appear saw-tooth acceleration waveform result from the oscillation caused by the overturning moment during the impact process

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16

NISHIO, Naoyuki, Shin-Ichiro NISHIDA, and Shintaro NAKATANI. "Study of a Planetary Exploration Rover with a Hinge-type Center-of-gravity Shift Mechanism." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 19, no. 4 (2021): 469–76. http://dx.doi.org/10.2322/tastj.19.469.

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17

NISHIO, Naoyuki, and Shin-Ichiro NISHIDA. "Study of Mars Exploration Rover get over step by hinge mechanism of center of gravity." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019 (2019): 2P1—S06. http://dx.doi.org/10.1299/jsmermd.2019.2p1-s06.

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18

Ivanov, A. V., and S. A. Zommer. "Analysis of the umbrella-type reflector opening process on a stand with an active gravity compensation system." Spacecrafts & Technologies 5, no. 4 (2021): 208–16. http://dx.doi.org/10.26732/j.st.2021.4.04.

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During the verification of the functioning of the transformed structures in ground conditions, it is necessary to minimize the effect of gravity in order to exclude the occurrence of additional loads on the hinge assemblies and opening mechanisms. To perform this task, when testing a transformable umbrella-type reflector, stands with an active gravity compensation system are used, in which the gravity compensation force is applied to each spoke of the reflector. However, when compensating for the gravity spokes of the reflector, the fixing point of the suspension cable does not coincide with t

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19

Gao, Dengliang, Emily Roberts, Connor Geiger, and Peter Sullivan. "Acadian detachment and wrench faults in central Pennsylvania: Implications for the Marcellus Shale reservoir integrity and gas productivity in the hinge of the Pennsylvania salient." Interpretation 8, no. 1 (2020): T151—T165. http://dx.doi.org/10.1190/int-2019-0110.1.

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High-quality 3D seismic data in Clearfield County, central Pennsylvania, reveal subsurface structural details of regional flat-top, box-shaped folds, convergent reverse faults, and cross-regional lineaments in the hinge of the Pennsylvanian salient. Cross-stratal variations in structural relief, bed curvature, and seismic facies indicate that the deformational intensity increases from below the Salina (Upper Silurian) to the Onondaga (Middle Devonian) and then decreases from the Onondaga to the Elk (Upper Devonian). The pre-Onondaga isochron thickness sees an increasing trend but the post-Onon

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20

Boonmee, Chichaya, Kittipoom Rodsin, and Krissachai Sriboonma. "Gravity Load Collapse Behavior of Nonengineered Reinforced Concrete Columns." Advances in Civil Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/9450978.

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This paper aims at investigating gravity load collapse behavior of extremely poor quality reinforced concrete columns under cyclic loading. Such columns were usually constructed by local people and may not be designed to meet any of the standards. It was found that their concrete strength may be as low as 5 MPa and the amount of longitudinal reinforcement may be lower than 1%. This type of column is deliberately defined as “nonengineered reinforced concrete column,” or NRCC. During earthquake, the gravity load collapse of the NRCC columns caused a large number of death tolls around the world.

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21

YE, Bo, Youxu YANG, Jiacheng LU, Lingfu YU, and Zhiyong CHENG. "Aeroelasticity study of high span ratio wing with flare folding wingtip." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 42, no. 2 (2024): 241–50. http://dx.doi.org/10.1051/jnwpu/20244220241.

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Flare folding wing-tips rely on the adaptive deformation of the structure to reduce the flight load, which can effectively simplify the control system, and has more advantages in cost and weight. To study the effect of the elastic folding wingtip as a passive load alleviation device, the flexible hinges were used to connect the folding wingtip to the wing, and the Doublet Lattice panel method was used to calculate the aerodynamic loads. Static and dynamic load response and flutter analysis were performed on the folding wingtip configurations with different structural parameters, and the effect

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22

Lavin, Ciaran, Angus Goody, and Ian Longley. "Stepping off the edge: the geological framework of deepwater northern Australia." APPEA Journal 63, no. 2 (2023): S257—S262. http://dx.doi.org/10.1071/aj22253.

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The northern part of deepwater Western Australia and the adjacent Indonesian territory is a vast, underexplored region which includes an area of Triassic geology atypical of the region. Seismic data highlights a substantial elongate Triassic depocentre mappable from the northern margin of the Browse Basin northwards to the Timor Trough. This is informally named the Outer Ashmore Trough. The Outer Ashmore Trough is bounded by an inboard hinge-zone. The axis of the trough extending beneath the Ashmore Reef-1 and North Hibernia-1 wells. The western flank (only partially mappable) is a steeply dip

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23

Ummidi, Mohan Satish Kumar* C. H. Vinod Kumar. "NONLINEAR BEHAVIOUR OF CYLINDRICAL WALL OF GROUND ELEVATED EMPTY RC SILO UNDER WIND LOAD." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 12 (2016): 339–45. https://doi.org/10.5281/zenodo.199563.

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Nonlinear analysis of civil structures gives as an analyst’s tool and entered the practicalworld of design engineering. Most FEA applications undertaken by design engineers were limited to linear analysis.It has been demonstrated that the ultimate strengths of some typical two-story planar frames (under gravity loads) determined by inelastic analysis are 10–30% higher than those estimated from the first-hinge elastic approach. Design of silos using the nonlinear analysis has described in this thesis. In this thesis it has shown that nonlinear analysis of two models i.e., Model 2.3 and Model 2.

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Biscarini, Andrea. "Dynamic Effects of Muscle Moment Arm Variation and Heavy External Loads on Hinge Joints." Journal of Applied Biomechanics 19, no. 3 (2003): 223–38. http://dx.doi.org/10.1123/jab.19.3.223.

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A two-dimensional model has been developed to predict and explain the effects of the variation of muscle moment arms during dynamic exercises involving heavy external loads. The analytical dependence of the muscle moment arm on the joint angle and on the origin and insertion position was derived for an ideal uniaxial hinge joint, modeling the muscle as a cable following an idealized minimum distance path from the origin to insertion that wraps around the bony geometry. Analytical expressions for the ratios of muscular force and the joint restraining reaction components to the external load wei

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25

Ferguson, John F., Roger N. Felch, Carlos L. V. Aiken, John S. Oldow, and Holly Dockery. "Models of the Bouguer gravity and geologic structure at Yucca Flat, Nevada." GEOPHYSICS 53, no. 2 (1988): 231–44. http://dx.doi.org/10.1190/1.1442458.

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The Bouguer gravity anomaly at Yucca Flat, Nevada, has been modeled by two different techniques: the Cordell‐Henderson and Parker‐Oldenburg methods. The three‐dimensional model has incorporated known density and structural information where possible. These models predict the structural relief on the Cenozoic‐Paleozoic contact to within 150 m or about 15 percent of the actual depth. The three‐dimensional Parker‐Oldenburg method has been found to be efficient in an application involving a large (9000 sample) data base. Numerical stability was ensured by the application of a consistent regulariza

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26

Ye, Bo, Youxu Yang, and Zhiyong Cheng. "Flare folding wing tips for static and gust loads alleviation." Journal of Physics: Conference Series 2459, no. 1 (2023): 012071. http://dx.doi.org/10.1088/1742-6596/2459/1/012071.

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Abstract The Passive gust load alleviation device can effectively simplify the control system by relying on the adaptive deformation of the structure. This research examines the influence of using folding wingtips during flight as a means of reducing static loads and gusty loads. Effects of hinge direction, wing-tip weight, stiffness and wing-tip centre of gravity on static and gust alleviation performance has been examined. The results show that the flare folding wing-tip can significantly reduce the static load and gust load of the aircraft. In a static aeroelastic trim analysis, a folding w

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27

Koolstra, J. H. "Dynamics of the Human Masticatory System." Critical Reviews in Oral Biology & Medicine 13, no. 4 (2002): 366–76. http://dx.doi.org/10.1177/154411130201300406.

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In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It

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28

Li, Wangpeng, Xudong Chen, Hongfan Wang, Andrew H. C. Chan, and Yingyao Cheng. "Evaluating the Seismic Capacity of Dry-Joint Masonry Arch Structures via the Combined Finite-Discrete Element Method." Applied Sciences 11, no. 18 (2021): 8725. http://dx.doi.org/10.3390/app11188725.

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The behaviour of dry-joint masonry arch structures is highly nonlinear and discontinuous since they are composed of individual discrete blocks. These structures are vulnerable to seismic excitations. It is difficult for traditional methods like the standard finite element method (FEM) to simulate masonry failure due to their intrinsic limitations. An advanced computational approach, i.e., the combined finite-discrete element method (FDEM), was employed in this study to examine the first-order seismic capacity of masonry arches and buttressed arches with different shapes subjected to gravity an

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29

Silva, José Guilherme Santos da, and Breno de Almeida Santos Oliveira. "Evaluation of the nondeterministic dynamic structural response of three-dimensional wind turbine steel towers." Wind Engineering 42, no. 4 (2018): 364–77. http://dx.doi.org/10.1177/0309524x18777368.

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This investigation develops an analysis methodology aiming at the evaluation of the nondeterministic dynamic structural response of typical wind turbine supporting steel towers. The study was centered on the evaluation of the dynamic behaviour of an actual MM92 wind turbine tower of 2.1 MW Wind Class III IEC2a and mounted on an 80-m-high steel tower. The developed finite element modelling calibration was based on comparisons to experimental data related to an experimental modal analysis acquired on the wind tower structure. The wind tower dynamic structural response was investigated under grav

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30

Razaeian, Sam, Christian Krettek, and Nael Hawi. "Self-Reduction in Proximal Humerus Fractures through Upright Patient Positioning: Is It up to Gravity?" Diagnostics 12, no. 9 (2022): 2096. http://dx.doi.org/10.3390/diagnostics12092096.

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Background: The self-reduction in proximal humerus fractures (PHFs) remains a poorly explored myth, and it was rarely investigated in the past. One of the oldest hypotheses suggests that gravity and the weight of the affected arm alone are driving forces, which facilitate a self-reducing potential in PHFs. However, thus far, clear radiographic evidence for this theory is missing in the literature. This study aimed to investigate the immediate effect of upright patient positioning on self-reducing of PHFs. Methods: Between November 2019 and November 2020, seven consecutively bedridden but menta

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Johnson, Ronald, Justin Birdwell, and Tracey Mercier. "Controls on organic matter distributions in Eocene Lake Uinta, Utah and Colorado." Mountain Geologist 55, no. 4 (2018): 177–216. http://dx.doi.org/10.31582/rmag.mg.55.4.177.

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The Green River Formation deposited in Eocene Lake Uinta in the Uinta and Piceance Basins, Utah and Colorado, contains the largest oil shale resource in the world with an estimated 1.53 trillion barrels of oil in place in the Piceance Basin and 1.32 trillion barrels in the Uinta Basin. The Douglas Creek arch, a slowly subsiding hinge-line between the two basins, created separate deep depocenters, one in each basin with shallow water conditions near the crest of the arch. Lake Uinta was a saline lake throughout its history with a lower saline to hypersaline layer (monimolimnion) and an upper le

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Ramhormozian, Shahab, G. Charles Clifton, Massimo Latour, and Gregory A. MacRae. "Proposed Simplified Approach for the Seismic Analysis of Multi-Storey Moment Resisting Framed Buildings Incorporating Friction Sliders." Buildings 9, no. 5 (2019): 130. http://dx.doi.org/10.3390/buildings9050130.

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An innovative, simplified, and accurate model is proposed and developed to enable simplified yet realistic time history analysis of multi-storey buildings with moment resisting connections using friction energy dissipaters in the commonly used structural analysis and design program, SAP2000. The analyses are rapid to undertake, thereby enabling detailed study of the influence of many building system effects on the overall response. This paper presents the outcome of dynamic analysis of a complete 13-storey moment resisting steel building with Sliding Hinge Joints as the beam-column connections

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33

Dooley, Tim P., Michael R. Hudec, Dan Carruthers, Martin P. A. Jackson, and G. Luo. "The effects of base-salt relief on salt flow and suprasalt deformation patterns — Part 1: Flow across simple steps in the base of salt." Interpretation 5, no. 1 (2017): SD1—SD23. http://dx.doi.org/10.1190/int-2016-0087.1.

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Passive margins underlain by a salt detachment are typically interpreted as kinematically linked zones of updip extension and downdip contraction separated by a zone of translation above a smoothly dipping base of salt. However, salt flow is affected by the base-of-salt geometry across which it flows, and early-stage gravity gliding induced by basin tilt may be complicated by the presence of salt-thickness changes caused by the pre-existing base-salt relief. We investigate these effects using physical models. Dip-parallel steps generate strike-slip fault zones separating domains of differentia

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Sampson, Lee M., and Nicholas C. Williams. "The geophysical response of the Goldrush-Fourmile orebody and implications for camp-scale Carlin-type deposit exploration, Cortez District, Nevada." Leading Edge 40, no. 2 (2021): 122–28. http://dx.doi.org/10.1190/tle40020122.1.

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Since discovery of the Goldrush and Fourmile deposits, numerous geophysical surveys have been acquired over the footprint of mineralization and surrounding areas to focus exploration. The Goldrush-Fourmile system extends more than 7 km in strike length and averages approximately 300 m wide. Most of the orebody lies more than 300 m below ground surface and continues to depths of more than 900 m. Direct detection of the ore system using geophysical tools is impeded by several factors. The system is relatively flat lying and sits in the hinge of a doubly plunging anticline. This gives the shallow

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Dong, Deyi, Di Zhou, Yuhan Jiang, et al. "Stiffness Analysis and Verification of Hydraulic Supporting Units for In-Situ Optical Testing of a 500 mm-Diameter Mirror." Machines 10, no. 10 (2022): 828. http://dx.doi.org/10.3390/machines10100828.

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A hydraulic in-situ support system is commonly used in the optical testing of mirrors, since it is convenient to unload the gravity of a mirror to be measured without the risk of being turned over or moved to another place. The existing supporting structures have several disadvantages, such as the problem of the output force deviating from the axis, being sensitive to machining loads, its flexible components easily leading to fatigue damage by cyclic loads and so on. A new single-cylinder hydraulic supporting unit with a ball hinge was proposed, analyzed and verified in this paper. A finite si

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Journal of Bangladesh Studies, Editors. "Brexit and Bangladesh: Implications for Trade and Market Access." Journal of Bangladesh Studies 19, no. 1-2 (2017): 11–24. https://doi.org/10.1163/27715086-0190102003.

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This paper has attempted to capture trade related implications of the UK referendum on leaving the EU (Brexit) for Bangladesh. The UK is a key trading partner of Bangladesh and over the past years the country has benefitted significantly from duty-free and quota-free market access to the UK under the Everything But Arms (EBA) initiative of the EU. However, when Brexit takes effect in March 2019, the scenario is set to change. The post-Brexit market access scenario will hinge on a number of factors including the terms of Brexit, UK's policy towards the LDCs, the new rules of origin, and exchang

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Putra, Riki Candra. "LOGIKA SISTEM PENAHAN BUKAAN PINTU MOBIL SAAT BERHENTI DI PERMUKAAN MIRING." Prosiding Simposium Nasional Multidisiplin (SinaMu) 4 (February 6, 2023): 301. http://dx.doi.org/10.31000/sinamu.v4i1.7889.

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AbstrakKeselamatan dan kenyamanan pada kendaraan adalah suatu prinsip yang penting dalam berkendara roda empat atau mobil, meskipun mobil dalam keadaan diam keselamatan tetap harus diutamakan terutama saat pengendara membuka pintu mobil yang sedang berhenti secara paralel di permukaan miring. Kondisi permukaan yang miring menyebabkan pintu mobil yang dibuka bisa menjadi berat saat di dorong atau menjadi mudah tertarik keluar dan cepat terbuka karena gravitasi kemiringan tersebut, apabila tidak dipegang dengan kuat bisa menyebabkan benturan keras terhadap benda-benda atau orang yang berada sang

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Singh, Chandeep, Shitij Kacker, and Sanjiv KS Marya. "Modified Extended Trochanteric Osteotomy." Journal of Postgraduate Medicine, Education and Research 50, no. 2 (2016): 93–95. http://dx.doi.org/10.5005/jp-journals-10028-1199.

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ABSTRACT Trochanteric osteotomy, the most extensile approach, is a valuable tool for difficult primary and revision total hip arthroplasties (THAs). Extended trochanteric osteotomy (ETO) is helpful in revision and extraction of well-fixed cemented as well as uncemented fremoral components, facilitates in cement extraction, and also in enhancing acetabular exposure. Tradional posterolateral ETO is initiated at the posterior aspect of the femur. We describe a modification of ETO by an anterolateral approach. The advantage of this approach is that as it preserves an intact musculo-osseo-muscular

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Yi, Chunzhi, Feng Jiang, Chifu Yang, Zhiyuan Chen, Zhen Ding, and Jie Liu. "Reference Frame Unification of IMU-Based Joint Angle Estimation: The Experimental Investigation and a Novel Method." Sensors 21, no. 5 (2021): 1813. http://dx.doi.org/10.3390/s21051813.

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Inertial measurement unit (IMU)-based joint angle estimation is an increasingly mature technique that has a broad range of applications in clinics, biomechanics and robotics. However, the deviations of different IMUs’ reference frames, referring to IMUs’ individual orientations estimating errors, is still a challenge for improving the angle estimation accuracy due to conceptual confusion, relatively simple metrics and the lack of systematical investigation. In this paper, we clarify the determination of reference frame unification, experimentally study the time-varying characteristics of refer

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VOLDMAN, GUSTAVO G., JUAN L. ALONSO, LUIS P. FERNÁNDEZ, et al. "Cambrian–Ordovician conodonts from slump deposits of the Argentine Precordillera: new insights into its passive margin development." Geological Magazine 155, no. 1 (2016): 85–97. http://dx.doi.org/10.1017/s0016756816000832.

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AbstractThe Los Sombreros Formation represents the western continental margin slope deposits of the Argentine Precordillera, a sub-terrane accreted to Gondwana as part of the Cuyania Terrane in early Palaeozoic times. The age of these gravity-driven deposits is controversial and, therefore, a precise biostratigraphic scheme is essential to reveal the evolution of the continental margin. New conodont samplings along with sedimentological and structural analysis carried out in the Los Sombreros Formation in the La Invernada Range provide clues to its depositional framework. The sedimentary succe

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Le, Jia-Liang, and Zdeněk P. Bažant. "Mechanics of Collapse of WTC Towers Clarified by Recent Column Buckling Tests of Korol and Sivakumaran." International Journal of Structural Stability and Dynamics 17, no. 09 (2017): 1771011. http://dx.doi.org/10.1142/s0219455417710110.

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The previously formulated model of the gravity-driven collapse of the twin towers of the World Trade Center (WTC) on September 11, 2011 was shown to match all the existing observations, including the video record of the crush-down motion of the top part of tower during the first few seconds, the seismically recorded duration of collapse, the size distribution of particles caused by impact comminution of concrete floor slabs, the loud booms due to near-sonic lateral ejection velocity of air and dust, and precedence of the crush-down collapse mode before the crush-up. Nevertheless, different deg

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Pavić, Mirja, Marco Pola, Bojan Matoš, et al. "A conceptual and numerical model of fluid flow and heat transport in the Topusko hydrothermal system." Geologia Croatica 77, no. 3 (2024): 291–310. http://dx.doi.org/10.4154/gc.2024.14.

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Comprehensive understanding of hydrothermal systems is often obtained through the integration of conceptual and numerical modelling. This integrated approach provides a structured framework for the reconstruction and quantification of fluid dynamics in the reservoir, thereby facilitating informed decision-making for sustainable utilisation and environmental protection of the hydrothermal system. In this study, an updated conceptual model of the Topusko hydrothermal system (THS; central Croatia) is proposed based on structural, geochemical, and hydrogeological analyses. The stratigraphic sequen

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Tremblay, Robert. "Achieving a Stable Inelastic Seismic Response for Multi-Story Concentrically Braced Steel Frames." Engineering Journal 40, no. 2 (2003): 111–29. http://dx.doi.org/10.62913/engj.v40i2.802.

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Recent seismic design provisions (CSA, 2001; AISC, 2002) for concentrically braced steel frames (CBFs) aim at dissipating seismic input energy through inelastic deformations in the bracing members. These deformations include tension yielding of the braces as well as plastic hinge rotation that develops upon buckling of the braces in compression and subsequent straightening of the braces when pulled in tension in the next loading cycle. Over the years, researchers have gained a good understanding of the hysteretic response of steel braces (Jain, Goel, and Hanson, 1980; Popov and Black, 1981; As

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Garlock, Maria M., and Spencer E. Quiel. "The Behavior of Steel Perimeter Columns in a High-Rise Building Under Fire." Engineering Journal 44, no. 4 (2007): 359–72. http://dx.doi.org/10.62913/engj.v44i4.918.

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The thermal response of structural steel may affect the behavior of a steel high-rise building exposed to fire. In a plane perpendicular to the exterior wall, a perimeter column is typically laterally braced by one beam. The fire-induced structural response of this beam that frames into the perimeter column (perpendicular to the exterior wall) directly affects the perimeter column behavior and the structural integrity of the frame as a whole. The objective of this research is to evaluate the behavior of perimeter columns in a steel high-rise building that is subjected to a large fire, and exam

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Erekaev, V. D. "ONTOLOGY OF LOOPED QUANTUM GRAVITY. HINGES." Metaphysics, no. 3 (December 15, 2021): 63–69. http://dx.doi.org/10.22363/2224-7580-2021-3-63-69.

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Some ontological aspects of the theory of loop quantum gravity are considered. First of all, its possible nature of one of the fundamental objects of theory - the quantum loop - is discussed. In particular, the possible material, geometric and instrumentalist interpretations of this object are briefly considered.

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Sabirov, Rashid A., and Elena N. Fisenko. "Modeling of suspended weightlessness on the cables of the beam system, by changing the tension forces." Siberian Aerospace Journal 24, no. 3 (2023): 482–500. http://dx.doi.org/10.31772/2712-8970-2023-24-3-482-500.

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The problem of weightlessness simulation of beam systems suspended on inextensible cables is considered. Imitation of weightlessness means zeroing or reducing any selected force factor (for example, the reaction of the support or the moment in the support or joint), and the kinematic factor (deflection or angle of rotation). It is required to select the forces in the cables such that the sum of the squares of the deflections at the points of the elastic line of the beam is minimal. The problem is formulated as a nonlinear programming problem; the search for the minimum of the objective functio

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Liu, Xiaohan, Kaihui Gu, Meixuan Li, and Zhifeng Cheng. "Optimization Design of Large-Aperture Primary Mirror for a Space Remote Camera." Sensors 23, no. 12 (2023): 5441. http://dx.doi.org/10.3390/s23125441.

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Lightweight, high stability, and high-temperature adaptability are the primary considerations when designing the primary mirror of a micro/nano satellite remote sensing camera. In this paper, the optimized design and experimental verification of the large-aperture primary mirror of the space camera with a diameter of Φ610 mm is carried out. First, the design performance index of the primary mirror was determined according to the coaxial tri-reflective optical imaging system. Then, SiC, with excellent comprehensive performance, was selected as the primary mirror material. The initial structural

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Filipkovskij, Sergey, Valentin Chigrin, Alexandr Soboliev, Yevgeny Vasilevskij, Nikolay Topal, and Larisa Filipkovska. "Investigation of the autorotation stability of a turbofan engine with a detached fan blade." Aerospace Technic and Technology, no. 4sup1 (August 24, 2023): 12–17. http://dx.doi.org/10.32620/aktt.2023.4sup1.02.

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One of the requirements for the aircraft being designed is the ability to continue flying and landing if one engine fails. One of the calculated cases of engine failure is the separation of the fan blade. This phenomenon causes large vibrations in both the engine itself and the aircraft structure. A calculation model and method for studying engine oscillations with damage in the form of blade separation have been developed. Numerical studies of the oscillations of the engine suspended on a pylon were conducted. The operation of an engine with an unbalance of the fan after switching off during

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Meggett, L. M., and R. C. Fenwick. "Seismic behaviour of a reinforced concrete portal frame sustaining gravity loads." Bulletin of the New Zealand Society for Earthquake Engineering 22, no. 1 (1989): 39–49. http://dx.doi.org/10.5459/bnzsee.22.1.39-49.

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    To study the behaviour of multistorey building frames under gravity and severe earthquake conditions a reinforced concrete portal frame was constructed. The beam was subjected to constant vertical loads while a cyclic lateral load was applied to the unit. Negative moment plastic hinges formed at the column faces while the positive moment hinges were located in the span. The rotations generated by each inelastic displacement accumulated. This placed high rotational demands on the plastic hinges, which reduced the overall ductile behaviour compared with that observed

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Milgrom, Mordehai. "MOND theory." Canadian Journal of Physics 93, no. 2 (2015): 107–18. http://dx.doi.org/10.1139/cjp-2014-0211.

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A general account of modified Newtonian dynamics (MOND) theory is given. I start with the basic tenets of MOND, which posit departure from standard dynamics in the limit of low acceleration — below an acceleration constant a0 — where dynamics become scale invariant. I list some of the salient predictions of these tenets. The special role of a0 and its significance are then discussed. In particular, I stress its coincidence with cosmologically relevant accelerations, which may point to MOND having deep interplay with cosmology. The deep-MOND limit and the consequences of its scale invariance ar

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