Log in

Relevant bibliographies by topics / Rocking of mass / Journal articles

To see the other types of publications on this topic, follow the link: Rocking of mass.

Journal articles on the topic 'Rocking of mass'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Rocking of mass.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Taniguchi, Tomoyo. "Rocking Mechanics of Flat-Bottom Cylindrical Shell Model Tanks Subjected to Harmonic Excitation." Journal of Pressure Vessel Technology 127, no. 4 (June 2, 2005): 373–86. http://dx.doi.org/10.1115/1.2042473.

Full text

Abstract:

The rocking motion of the tanks is complex and not fully understood. Using model tanks that possess concentric rigid-doughnut-shaped bottom plates, this paper tries to clarify its fundamental mechanics through the analog of rocking motion of rigid bodies. Introducing an effective mass for the internal liquid for rocking motion enables the development of a dynamical system including the rocking-bulging interaction motion and the effective mass of liquid for the interaction motion. Since the base shear and uplift displacement observed during shaking tests match well with computed values, the proposed procedure can explain the mechanics of the rocking motion of the model tanks used herein.

APA, Harvard, Vancouver, ISO, and other styles

2

Acikgoz, Sinan, and Matthew J. DeJong. "Analytical modelling of multi-mass flexible rocking structures." Earthquake Engineering & Structural Dynamics 45, no. 13 (April 27, 2016): 2103–22. http://dx.doi.org/10.1002/eqe.2735.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Wang, Xiong, Xiaobin Xu, Tao Zhu, and Xuezhong Wu. "Vibration sensitivity analytical analysis for rocking mass microgyroscope." Microsystem Technologies 21, no. 7 (May 13, 2014): 1401–9. http://dx.doi.org/10.1007/s00542-014-2197-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Zhang, Ji Gang, and Zhi Wei Jiang. "Study on Seismic Performance of Offshore Platform with Rocking Wall - TMD System." Applied Mechanics and Materials 610 (August 2014): 78–83. http://dx.doi.org/10.4028/www.scientific.net/amm.610.78.

Full text

Abstract:

Offshore platform rocking wall system and tuned mass damper are briefly introduced, and the paper integrates the advantages of these two kinds of seismic method, and the TMD is attached to the jacket offshore platform - rocking wall system, using the ANSYS for finite element analysis, and the analysis results are optimized. The results show that compared with the offshore platform - rocking wall system, additional TMD can give full play to the performances of the two kinds of seismic methods, which is remarkable.

APA, Harvard, Vancouver, ISO, and other styles

5

Wang, Andong, Shanghong Chen, Wei Lin, and Ai Qi. "Seismic Performance Analysis of Tuned Mass Rocking Wall (TMRW)-Frame Building Structures." Buildings 11, no. 7 (July 5, 2021): 293. http://dx.doi.org/10.3390/buildings11070293.

Full text

Abstract:

A tuned mass rocking wall (TMRW) is a passive control device that combines the merits of a traditional tuned mass damper (TMD) and a traditional rocking wall (RW). TMRWs not only help avoid weak story failure of the host structure but can also be regarded as a largely tuned mass substructure in the building structure. Through the appropriate design of the frequency ratio, the host structure can dissipate much more energy under earthquake excitations. In this paper, the basic equations of motion for the mechanical model of an SDOF structure-rigid rocking wall are established, and the optimization formulas of frequency ratio and damping ratio of TMRW are derived. Through the dynamic elastoplastic analysis of a six-story TMRW-frame model, the applicability of the derived parameter optimization formulas and the effectiveness of the TMRW in seismic performance control are investigated. The results demonstrate that the TMRW can coordinate the uneven displacement angle between stories of the host structure. Additionally, the TMRW is found to possess the merit of reducing both the peak and root-mean-square (RMS) structural responses when subjected to different types of earthquake excitations.

APA, Harvard, Vancouver, ISO, and other styles

6

Xiang, Ping, and Akira Nishitani. "Structural vibration control with the implementation of a pendulum-type nontraditional tuned mass damper system." Journal of Vibration and Control 23, no. 19 (January 20, 2016): 3128–46. http://dx.doi.org/10.1177/1077546315626821.

Full text

Abstract:

Self-centering systems, such as base-rocking-wall systems, have been studied and demonstrated to be capable of achieving enhanced seismic-resisting performance. For these rocking-wall systems, unbonded post-tensioning strands and damage-permitted energy-dissipating fuses are usually implemented along the full height of the walls. Structural damage and residual deformation of main structures can be mitigated through deformation of the fuses which are replaceable after strong earthquakes. An innovative self-centering system referred to as a pendulum-type nontraditional tuned mass damper system is newly proposed in this paper, which can be deemed to be an inverted rocking system. Pendulum components can automatically return to their original position due to the effect of gravity, without any post-tensioning strands being required. Energy dissipators are only implemented between the bottom end of the pendulum component and the ground, and they can be easily fabricated and replaced. Both experimental and numerical studies have been carried out to examine seismic performance of the pendulum-type nontraditional tuned mass damper system, and it is found that satisfactory control of interstory drift and floor absolute acceleration can be achieved, while small movement space is required.

APA, Harvard, Vancouver, ISO, and other styles

7

Cheng, Yuxiang, Weiping Zhang, Jian Tang, Wu Liu, Yinghai Wang, and Wenyuan Chen. "Research on a Micro Piezoelectric Gyroscope with Concentrated Rocking-Mass." International Journal of Applied Ceramic Technology 12 (March 23, 2015): E208—E214. http://dx.doi.org/10.1111/ijac.12397.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Dewen, Yafei Zhang, Sitong Fang, and Yang Liu. "Horizontal-Vertical-Rocking Coupled Response Analysis of Vertical Seismic Isolated Structure under Near-Fault Earthquakes." Shock and Vibration 2020 (July 23, 2020): 1–10. http://dx.doi.org/10.1155/2020/6519808.

Full text

Abstract:

For vertical isolated structures with excessive vertical eccentricity for mass and vertical stiffness, horizontal-vertical-rocking response needs to be better understood for vertical isolated structures located in near-fault areas, where long-period velocity pulse can be produced. In this study, a seismic isolation system including quasizero stiffness (QZS) and vertical damper (VD) is used to control near-fault (NF) vertical earthquakes. The responses of horizontal-vertical-rocking coupling base-isolated structure including quasizero stiffness (QZS) and vertical damper (VD) subjected to NF horizontal and vertical ground motions are investigated. Nonlinear dynamic analyses are conducted to study the effects of essential parameters such as isolation system eccentricity, static equilibrium position, vertical isolation period, and vertical damping ratio on seismic responses of vertical isolated structure. It is found that increasing vertical period and damping ratio causes the vertical isolated structures to behave well in reducing rocking responses of structure. The effect of horizontal-vertical-rocking coupling on vertical seismic isolation efficiency is insignificant. The vertical seismic isolation remains effective as compared to the system supported on rubber bearings. The vertical damping can significantly control the vertical displacement and rocking moment.

APA, Harvard, Vancouver, ISO, and other styles

9

Wang, Xiong, Dingbang Xiao, Zelong Zhou, Xuezhong Wu, Zhihua Chen, and Shengyi Li. "Support Loss and Q Factor Enhancement for a Rocking Mass Microgyroscope." Sensors 11, no. 10 (October 19, 2011): 9807–19. http://dx.doi.org/10.3390/s111009807.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ansari, M., E. Esmailzadeh, and N. Jalili. "Coupled vibration and parameter sensitivity analysis of rocking-mass vibrating gyroscopes." Journal of Sound and Vibration 327, no. 3-5 (November 2009): 564–83. http://dx.doi.org/10.1016/j.jsv.2009.06.021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Ishida, K., and N. Kobayashi. "An Effective Method of Analyzing Rocking Motion for Unanchored Cylindrical Tanks Including Uplift." Journal of Pressure Vessel Technology 110, no. 1 (February 1, 1988): 76–87. http://dx.doi.org/10.1115/1.3265572.

Full text

Abstract:

In order to calculate the rocking response of the unanchored cylindrical tank, including the bottom uplift due to seismic loading, a simple but effective method is developed. Firstly, an analysis model for the rocking response is presented; tank wall and liquid content are replaced with a mass-spring system, and the nonlinearity associated with the partial uplift of bottom plate is considered as the rotational spring of a bilinear type. The reliability of this analysis was illustrated by comparing the calculation results of resonance frequencies and rotation angles of tank models with the results of vibration tests. Secondly, a simple calculation method for obtaining the rocking responses of tanks from a few graphs without troublesome calculations is proposed. And lastly, some examples of applying the calculation for full-scale tanks are shown. It is clarified that the bottom plates of tall tanks with a capacity of a few thousand kiloliters are most likely to be uplifted by seismic loading.

APA, Harvard, Vancouver, ISO, and other styles

12

Divan, Jega, Bhajan Lal, Khalik M. Sabil, and Paul Hammonds. "Capillary Force-Aided Gas Hydrate Growth in Shut-In Conditions." Advanced Materials Research 1133 (January 2016): 619–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.619.

Full text

Abstract:

This paper presents a significant finding where a capillary force is observed for a gas hydrate growth under a 24-hours shut-in condition (static fluid) using a newly designed apparatus comprising six units of identical rocking cells within isochoric conditions. The gas hydrate growth (static condition) is compared to a gas hydrate formation under a rocking condition. Crystal growth with a simulated natural gas mixture at various time intervals is noted. The visual observations of nucleation and growth at a wetted surface are described. The obtained visual results suggest that capillary forces provide continuous mass-transfer of water towards gas hydrate growth, even within shut-in conditions.

APA, Harvard, Vancouver, ISO, and other styles

13

Schlegel, Christian, Gabriela Kiekenap, Holger Kahmann, and Rolf Kumme. "Mechanical influences in sinusoidal force measurement." ACTA IMEKO 4, no. 2 (June 29, 2015): 57. http://dx.doi.org/10.21014/acta_imeko.v4i2.206.

Full text

Abstract:

The paper describes mechanical influences which disturb a sinusoidal force calibration and hence have an influence on measurement uncertainty. The measurements are based on the application of a scanning vibrometer and the use of triaxial accelerometers. The measuring of many acceleration points on the top mass of the transducer makes it possible to obtain acceleration distributions from which a standard deviation can be derived; the triaxial accelerometer allows the observance of certain effects, like rocking modes, or other problems related to specific excitation frequencies of the force transducer. Both measurements can be related to each other. The rocking effects are discussed with FEM model calculations.

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Xiong, Ding Bang Xiao, Xue Zhong Wu, and Sheng Yi Li. "Vibration Frequency Analytical Formula and Parameter Sensitivity Analysis for Rocking Mass Gyroscope." Advanced Materials Research 317-319 (August 2011): 1068–73. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1068.

Full text

Abstract:

Rocking-Mass Gyroscope (RMG) is a dual-axial symmetry vibrating mass gyroscope, whose operational modes are completely uniform, and values of frequency are equal. RMG has the potential to be the gyroscope with high sensitivity. Predicting the frequencies for the operational modes of RMG is critical. The natural frequency analytical formula of RMG is developed by using the assumed modal method and vector composition method. The FEM simulations and experiments validate the analytical formula. The sensitivities of natural frequency to different parameters are also analyzed. The presented results provide references for optimization design of RMG.

APA, Harvard, Vancouver, ISO, and other styles

15

Ahn, Sunyhik D., Paul E. Frith, Adrian C. Fisher, Alan M. Bond, and Frank Marken. "Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry." Journal of Electroanalytical Chemistry 722-723 (May 2014): 78–82. http://dx.doi.org/10.1016/j.jelechem.2014.02.018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Wang, Xiong, Xiaobin Xu, Tao Zhu, Xuezhong Wu, and Mengchun Pan. "Analytical analysis and experimental investigation of energy loss mechanisms in rocking mass microgyroscope." Microsystem Technologies 23, no. 1 (November 12, 2015): 1–12. http://dx.doi.org/10.1007/s00542-015-2713-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Huang, Da, Shiling Pei, and Aleesha Busch. "Optimizing displacement-based seismic design of mass timber rocking walls using genetic algorithm." Engineering Structures 229 (February 2021): 111603. http://dx.doi.org/10.1016/j.engstruct.2020.111603.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Gao, Chao, Juan Wang, Qingshan Yang, and Na Yang. "Analysis of Rocking Behavior of Tang-Song Timber Frames under Pulse-Type Excitations." International Journal of Structural Stability and Dynamics 20, no. 01 (October 29, 2019): 2050002. http://dx.doi.org/10.1142/s0219455420500029.

Full text

Abstract:

This paper investigates the rocking behavior of two free-standing columns capped with a freely supported superstructure in an effort to explain the seismic stability of Tang-Song timber frames subjected to pulse-type excitations. The geometric characteristics of the column determine the acceleration amplitude needed to create uplift of the rocking frame, which also affect the loss of energy during impact along with the mass ratio of the superstructure to the column. Two distinct rocking modes are analyzed according to whether the frame can be limited by the tenon-mortise joint. The expression that yields the minimum acceleration required to overturn the frame is derived within the limits of the linear approximation of the governing equation of motion. Different safety and overturning regions plotted on the stability diagrams indicates that the partially joint limitation may weaken the seismic behavior. The entirely limited frame will rock within the fixed amplitude caused by the joint gap and never topple down. Probability analysis results of the entirely limited frame suggest that a great majority of this type of traditional timber structures have excellent seismic capacity to resist the horizontal excitation.

APA, Harvard, Vancouver, ISO, and other styles

19

Wu, Q., and N. Sabet. "An experimental study of passive dynamic walking." Robotica 22, no. 3 (May 2004): 251–62. http://dx.doi.org/10.1017/s0263574703005563.

Full text

Abstract:

A two-straight-legged walking mechanism with flat feet is designed and built to study the passive dynamic gait. It is shown that the mechanism having flat feet can exhibit passive dynamic walking as those with curved feet, but the walking efficiency is significantly lower. It is also shown that the balancing mass and its orientation are effective for controlling side-to-side rocking and yaw, which have significant effects on steady walking. The effects of various parameters on the gait patterns are also studied. lt is shown that changes in the ramp angle have the most dominant effect on the gait pattern as compared with the changes in the hip mass, ramp surface friction and size of the flat feet. More specifically, as the ramp angle increases, the step length increases while the range of the side-to side rocking angle decreases and the step length dictates the walking speed and the gravitational power. Another finding, is that adding a hip mass improves the walking efficiency by allowing the mechanism to walk on a flatter ramp. This research enables us to gain a better understanding of the mechanics of walking. Such an understanding will have a direct impact on better design of prostheses and on the active control aspects of bipedal robots.

APA, Harvard, Vancouver, ISO, and other styles

20

Bai, Yun, Murray Moo‐Young, and William A. Anderson. "A mechanistic model for gas–liquid mass transfer prediction in a rocking disposable bioreactor." Biotechnology and Bioengineering 116, no. 8 (May 20, 2019): 1986–98. http://dx.doi.org/10.1002/bit.27000.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Smith, Frank T., and Phillip L. Wilson. "Body-rock or lift-off in flow." Journal of Fluid Mechanics 735 (October 22, 2013): 91–119. http://dx.doi.org/10.1017/jfm.2013.464.

Full text

Abstract:

AbstractConditions are investigated under which a body lying at rest or rocking on a solid horizontal surface can be removed from the surface by hydrodynamic forces or instead continues rocking. The investigation is motivated by recent observations on Martian dust movement as well as other small- and large-scale applications. The nonlinear theory of fluid–body interaction here has unsteady motion of an inviscid fluid interacting with a moving thin body. Various shapes of body are addressed together with a range of initial conditions. The relevant parameter space is found to be subtle as evolution and shape play substantial roles coupled with scaled mass and gravity effects. Lift-off of the body from the surface generally cannot occur without fluid flow but it can occur either immediately or within a finite time once the fluid flow starts up: parameters for this are found and comparisons are made with Martian observations.

APA, Harvard, Vancouver, ISO, and other styles

22

RADHAKRISHNA, M., and C. KAMESWARA RAO. "VIBRATION OF DOUBLE BELLOWS TYPE EXPANSION JOINT IN LATERAL AND ROCKING MODES." International Journal of Structural Stability and Dynamics 06, no. 04 (December 2006): 575–88. http://dx.doi.org/10.1142/s021945540600209x.

Full text

Abstract:

In this paper, the exact frequency and mode shape expressions are derived for universal bellows type of expansion joint in lateral and rocking modes of vibration. The effect of equivalent support stiffness and mass on the natural frequencies and mode shapes are studied in detail and the results for a range of non-dimensional parameters are presented in graphical forms which should be useful for piping and bellow designers.

APA, Harvard, Vancouver, ISO, and other styles

23

KOBAYASHI, Nobuyuki, Yajun ZHANG, Noriaki SEO, Masahiro WATANABE, and Friedrich PFEIFFER. "Rocking and Sliding Coupled Seismic Response of Cylindrical Tank Made Up Physical Mass-Spring Subsystem and Mode Mass-Spring Subsystem." Transactions of the Japan Society of Mechanical Engineers Series C 71, no. 704 (2005): 1146–52. http://dx.doi.org/10.1299/kikaic.71.1146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Wang, Xiong, Dingbang Xiao, Zelong Zhou, Zhihua Chen, Xuezhong Wu, and Shengyi Li. "Support loss for beam undergoing coupled vibration of bending and torsion in rocking mass resonator." Sensors and Actuators A: Physical 171, no. 2 (November 2011): 199–206. http://dx.doi.org/10.1016/j.sna.2011.08.023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Di Egidio, Angelo, Andrea M. de Leo, and Giorgia Simoneschi. "Effectiveness of mass–damper dynamic absorber on rocking block under one-sine pulse ground motion." International Journal of Non-Linear Mechanics 98 (January 2018): 154–62. http://dx.doi.org/10.1016/j.ijnonlinmec.2017.10.015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Xiong, Xiao-bin Xu, De-wei Zhang, and Xue-zhong Wu. "Pre-buried mask wet etching for suspended silicon microstructures applied in rocking mass micro-gyroscope." Microsystem Technologies 24, no. 2 (June 15, 2017): 1081–87. http://dx.doi.org/10.1007/s00542-017-3463-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Bai, Yun, Murray Moo-Young, and William A. Anderson. "Characterization of power input and its impact on mass transfer in a rocking disposable bioreactor." Chemical Engineering Science 209 (December 2019): 115183. http://dx.doi.org/10.1016/j.ces.2019.115183.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Kikuchi, Rikiro, Katsuichirou Hijikata, Takayuki Koyanagi, Mitsugu Mashimo, Shinya Tanaka, Atsushi Suzuki, and Yoshinori Mihara. "Study on Vertical Motions by Rocking Responses of Reactor Buildings." Journal of Disaster Research 7, no. 5 (October 1, 2012): 609–18. http://dx.doi.org/10.20965/jdr.2012.p0609.

Full text

Abstract:

Earthquake observation records were observed in reactor buildings of Kashiwazaki-Kariwa Nuclear Power Plant Site during the Niigata-ken Chuetsu-oki earthquake in 2007 (NCO). Some studies on the seismic response and simulation analyses were performed to investigate dynamic characteristics of the structures. In particular, it was clarified that the vertical motions of the reactor building of Unit 6 were greater than those of adjacent reactor buildings of Unit 5 and Unit 7. This paper discusses the causes of this by earthquake observation records and simulation analyses of the reactor buildings. In general, seismic response of vertical motions is relatively well-simulated using lumped mass model with stick elements that have vertical stiffness and with the soil spring between the basemat and support ground. However, vertical motions are influenced by rocking motions with horizontal response in some cases. This paper focuses on relationships between the vertical responses and the vertical motions induced by the rocking motions with simulation analyses and observation records during both NCO earthquake and aftershock of NCO. The reasons why the vertical motions of the reactor building of Unit 6 were larger are discussed.

APA, Harvard, Vancouver, ISO, and other styles

29

Bensoussan, S., C. Malgrange, M. Sauvage-Simkin, K. N'Guessan, and P. Gibart. "X-ray diffraction evidence for transient composition effects in MOVPE multilayer growth for Ga1−x Al x As alloys." Journal of Applied Crystallography 20, no. 3 (June 1, 1987): 230–34. http://dx.doi.org/10.1107/s0021889887086795.

Full text

Abstract:

X-ray rocking-curve analysis is applied to the detection of artifacts in multilayer epitactic growth of III–V ternary compounds by metal–organic vapour-phase epitaxy (MOVPE). Transient spikes in the composition result in unwanted additional thin layers whose presence disturbs the interference pattern expected from the designed heterostructures, thus modifying the oscillating part of the reflection profile. X-ray methods and secondary-ion mass spectroscopy (SIMS) lead to descriptions of the actual layer stacking in good agreement with each other.

APA, Harvard, Vancouver, ISO, and other styles

30

Pei, Shiling, John W. van de Lindt, Andre R. Barbosa, Jeffrey W. Berman, Eric McDonnell, J. Daniel Dolan, Hans-Erik Blomgren, Reid B. Zimmerman, Da Huang, and Sarah Wichman. "Experimental Seismic Response of a Resilient 2-Story Mass-Timber Building with Post-Tensioned Rocking Walls." Journal of Structural Engineering 145, no. 11 (November 2019): 04019120. http://dx.doi.org/10.1061/(asce)st.1943-541x.0002382.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Ломов, А. А., Б. М. Середин, С. Ю. Мартюшов, А. Н. Заиченко, С. Г. Симакин, and И. Л. Шульпина. "Структурное совершенство и состав легированных галлием термомиграционных слоев кремния." Письма в журнал технической физики 46, no. 6 (2020): 27. http://dx.doi.org/10.21883/pjtf.2020.06.49161.18153.

Full text

Abstract:

We suggest a technique of fabrication of thick heavily Ga doped by thermomigration layers of Si for modern power electronics devices. Structure perfection and layers composition as a function of formation temperature were studied by techniques of X-ray Lang topography, X-ray rocking curves and secondary ion mass spectrometry. The fabricated layers are single crystalline, no mismatch dislocations were found on the interface with the Si substrate. The Ga concentration in the layers can be varied in the range (1.6-4.8)1019 cm-3, being higher than for Si doping with aluminum.

APA, Harvard, Vancouver, ISO, and other styles

32

Di Egidio, Angelo, Andrea M. de Leo, and Alessandro Contento. "The Use of a Pendulum Dynamic Mass Absorber to Protect a Trilithic Symmetric System from the Overturning." Mathematical Problems in Engineering 2019 (January 14, 2019): 1–14. http://dx.doi.org/10.1155/2019/4843738.

Full text

Abstract:

The trilith consists of two vertical elements (columns) supporting a horizontal element (lintel). The understanding of the dynamic behaviour of triliths is an important step towards their preservation and starts with the knowledge of the dynamics of rigid blocks. A passive method based on a dynamic mass absorber is used to protect a trilith from overturning. The protection system is modelled as a pendulum, hinged on the lintel, with the mass lumped at the end. The equations of rocking motion, uplift and the impact conditions are obtained for the coupled system trilith-mass absorber. An extensive parametric analysis is performed with the aim to compare the behaviour of the system with and without the pendulum, under impulsive one-sine (or one-cosine) base excitations. In order to point out the effectiveness of the protection system, overturning spectra, providing the amplitude of the excitation versus its frequency, are obtained. The pendulum mass absorber results effective in avoiding overturning in specific ranges of the frequency of the excitation. However, outside these ranges the mass absorber never compromises the safety of the trilith.

APA, Harvard, Vancouver, ISO, and other styles

33

KATO, Takaaki, Masato ISHIKAWA, Koichi OSUKA, and Yoshiyuki SANKAI. "1A1-P15 Development of the Rocking tripod walking robot with single mass-driving system(Walking Robot (1))." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2013 (2013): _1A1—P15_1—_1A1—P15_2. http://dx.doi.org/10.1299/jsmermd.2013._1a1-p15_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Grm, Aleksander. "Ships Added Mass Effect on a Flexible Mooring Dolphin in Berthing Manoeuvre." Journal of Marine Science and Engineering 9, no. 2 (January 21, 2021): 108. http://dx.doi.org/10.3390/jmse9020108.

Full text

Abstract:

This paper deals with the hydrodynamic effect of the ship on a flexible dolphin during a mooring manoeuvre. The hydrodynamic effect refers to the change in momentum of the surrounding fluid, which is defined by the concept of added mass. The main reason for the present study is to answer the question, “What is the effect of the added mass compared to the mass of the ship during the mooring procedure for a particular type of ship?” Measured angular frequencies of dolphin oscillations showed that the mathematical model can be approximated by the zero frequency limit. This simplifies the problem to some extent. The mooring is a pure rocking motion, and the 3D study is approximated by the strip theory approach. Moreover, the calculations were performed with conformal mapping using conformal Lewis mapping for the hull geometry. The fluid flow is assumed to be non-viscous, non-rotating and incompressible. The results showed that the additional mass effect must be taken into account when calculating the flexible dolphin loads.

APA, Harvard, Vancouver, ISO, and other styles

35

Bolleter, Ulrich, Adolfo Wyss, Ivon Welte, and Rudolf Stu¨rchler. "Measurement of Hydrodynamic Interaction Matrices of Boiler Feed Pump Impellers." Journal of Vibration and Acoustics 109, no. 2 (April 1, 1987): 144–51. http://dx.doi.org/10.1115/1.3269406.

Full text

Abstract:

For rotordynamic calculations on multistage pumps, one must know–among other things–the hydrodynamic forces generated by a vibrating impeller. In linearized form these forces may be described by stiffness, damping, and mass matrices. Such matrices were measured with the help of a test apparatus using the “rocking arm” principle for an impeller of 0.35 m (13.8 in.) dia at various speeds. It is shown that the hydrodynamic forces generated by the vibrating impeller can be described reasonably well by the standard rotordynamic stiffness, damping, and mass matrices, except for the direct damping term which had to be supplemented by a damping term whose magnitude is proportional to displacement rather than velocity. It is further shown how the test results can directly be compared with results from tests using circular orbits.

APA, Harvard, Vancouver, ISO, and other styles

36

Wagner, Günter, M. Schmidbauer, K. Irmscher, P. Tanner, and R. Fornari. "P-Type Doping of Epitaxial 3C-SiC Layers on Silicon (001)." Materials Science Forum 615-617 (March 2009): 165–68. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.165.

Full text

Abstract:

Single-crystalline 3C-SiC epitaxial layers were grown on on-axis Si (001) substrates by low-pressure hot-wall chemical vapour deposition. Aluminium from a trimethylaluminium (TMA) source was used for p-type doping. The atomic Al and carrier concentrations in the layers were determined as a function of the partial pressure of the TMA source gas. Secondary ion mass spectroscopy (SIMS), Hall-effect measurements at room temperature and four-point electrical resistivity method were applied to measure the atomic and electrically active Al concentrations. The crystalline perfection of the layers was characterized by high-resolution x-ray diffraction (HRXRD). At TMA-partial pressures ranging from 510-7 mbar up to 1.510-4 mbar corresponding aluminium concentrations from 21015 cm-3 up to 1.31019 cm-3 were measured in the epitaxial layers. On increasing the Al concentration from 1x1017 cm-3 to 1x1019 cm-3 the layer electrical resistivity decreases from 17 cm to 0.8 cm, while no influence on the crystalline quality of the layers was observed. The average full width at half maximum (FWHM) of the rocking curve for a 5µm thick 3C-SiC layer is about 500 arcsec. With increasing layer thickness (up to 16 µm) the FWHM of the rocking curve decreases to about 300 arcsec.

APA, Harvard, Vancouver, ISO, and other styles

37

Lee, Ho, Robert T. Ryan, Jeehyun Kim, Bernard Choi, Navanit V. Arakeri, Joel M. H. Teichman, and A. J. Welch. "Dependence of Calculus Retropulsion Dynamics on Fiber Size and Radiant Exposure During Ho:YAG Lithotripsy." Journal of Biomechanical Engineering 126, no. 4 (August 1, 2004): 506–15. http://dx.doi.org/10.1115/1.1786297.

Full text

Abstract:

During pulsed laser lithotripsy, the calculus is subject to a strong recoil momentum which moves the calculus away from laser delivery and prolongs the operation. This study was designed to quantify the recoil momentum during Ho:YAG laser lithotripsy. The correlation among crater shape, debris trajectory, laser-induced bubble and recoil momentum was investigated. Calculus phantoms made from plaster of Paris were ablated with free running Ho:YAG lasers. The dynamics of recoil action of a calculus phantom was monitored by a high-speed video camera and the laser ablation craters were examined with Optical Coherent Tomography (OCT). Higher radiant exposure resulted in larger ablation volume (mass) which increased the recoil momentum. Smaller fibers produced narrow craters with a steep contoured geometry and decreased recoil momentum compared to larger fibers. In the presence of water, recoil motion of the phantom deviated from that of phantom in air. Under certain conditions, we observed the phantom rocking towards the fiber after the laser pulse. The shape of the crater is one of the major contributing factors to the diminished recoil momentum of smaller fibers. The re-entrance flow of water induced by the bubble collapse is considered to be the cause of the rocking of the phantom.

APA, Harvard, Vancouver, ISO, and other styles

38

Keane, Rachel. "How the Domain Name Scruffles are Rocking the Foundations of Trade Mark law." Victoria University of Wellington Law Review 32, no. 1 (March 5, 2001): 321. http://dx.doi.org/10.26686/vuwlr.v32i1.5906.

Full text

Abstract:

The central proposition of this paper is that it is no longer valid to assert that the only and proper function of the trade is to denote the source of the product to which it is affixed. Trade marks are being employed in many diverse ways. In the age of mass media, trade marks may provide the key to marketing successfully. The dilution doctrine has developed in recognition of the potential value of a trade mark to tis owner. Anti-dilution provisions, as far as they go, do provide a useful tool in protecting the trade mark itself. However, as technology continues to advance, so does the trade mark function. The so-called domain name disputes, primarily in the United States are evidence of this claim. Not only have the decisions in these cases furthered the development of the trade mark legislation, they have demonstrated the inadequacies of the current trade mark legislation and the desperate need for reform. These inadequacies are examined and reform is proposed. Finally, the paper assesses the desirability of allowing the further expansion of the trade mark. It is submitted that the proper expansion of the trade mark should not be resisted.

APA, Harvard, Vancouver, ISO, and other styles

39

Bahmani, Pouria, John van de Lindt, Asif Iqbal, and Douglas Rammer. "Mass Timber Rocking Panel Retrofit of a Four-Story Soft-Story Building with Full-Scale Shake Table Validation." Buildings 7, no. 4 (June 8, 2017): 48. http://dx.doi.org/10.3390/buildings7020048.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Goldner, R. B., T. E. Haas, F. O. Arntz, S. Slaven, K. K. Wong, B. Wilkens, C. Shepard, and W. Lanford. "Nuclear reaction analysis profiling as direct evidence for lithium ion mass transport in thin film ‘‘rocking‐chair’’ structures." Applied Physics Letters 62, no. 14 (April 5, 1993): 1699–701. http://dx.doi.org/10.1063/1.109580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Guan, Ran, Wei Ping Zhang, Gong Zhang, Yu Xiang Cheng, Wen Yuan Chen, Xiao Sheng Wu, Feng Cui, and Wu Liu. "Design and Fabrication of a Novel Biaxial Piezoelectric Micro-Gyroscope." Key Engineering Materials 562-565 (July 2013): 421–25. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.421.

Full text

Abstract:

Despite the popularity of piezoelectric vibratory micro-gyroscope in the past decades for their small size, low cost, batch fabrication and energy efficient, most of them can only detect single axis angular rate. In this paper, a novel biaxial piezoelectric micro-gyroscope fabricated with PZT wafer is proposed. To acquire two-axial angular rate sensing, a bouncing mode of the vibrator is utilized as the drive mode and two rocking modes are used as the sense modes. PZT is used as the vibration body instead of transducer, which enhances the drive and sense efficiency of the sensor. In this paper, the structure and working principle of the novel biaxial piezoelectric micro-gyroscope are introduced firstly. In addition, modal analysis has been made to research the voltage distribution of the piezoelectric vibrator and the drive and sense electrodes of the gyroscope are designed. By the optimization design of the proof mass, the frequency split between the drive mode (bouncing mode) and sense modes (rocking modes) is reduced and the sensitivity of the gyroscope is improved. Harmonic analysis has been made to research the Coriolis Effect of the gyroscope. The data get from the harmonic analysis is demodulated by Matlab and the sensitivity is given. The simulation results verify the principle of the novel biaxial piezoelectric micro-gyroscope. With the optimized design, the sensor is fabricated with MEMS technology at last.

APA, Harvard, Vancouver, ISO, and other styles

42

Chu, Peir-Yung, and Relva C. Buchanan. "Reactive liquid phase sintering of YBa2Cu3O7-x superconducting thin films: Part II. Sintering mechanism and film properties." Journal of Materials Research 9, no. 4 (April 1994): 844–51. http://dx.doi.org/10.1557/jmr.1994.0844.

Full text

Abstract:

Reactive liquid phase sintering of the YBCO films prepared from carboxylate solution precursors was investigated. A liquid phase was formed by the BaO—CuO binary compound at 620 °C, which facilitated the crystallization and growth of the YBCO grains. Strong capillary forces associated with the liquid phase sintering resulted in a dense, highly oriented microstructure. The YBCO films processed by this reactive liquid phase process showed Tc(zero) = 90.2 K and Jc = 1.3 × 105 A/cm2 at 77 K. The (006) rocking curve measurement indicated excellent grain orientation with a FWHM better than 0.2°. A secondary ion mass spectroscopy (SIMS) study showed uniform film composition, and the film/substrate interaction zone was limited to ≈0.1 μm. Average film roughness was about 32 nm.

APA, Harvard, Vancouver, ISO, and other styles

43

Kita, Ryusuke, Kenichi Kawaguchi, Takashi Hase, Takeshi Koga, Rittaporn Itti, and Tadataka Morishita. "Effects of oxygen ion energy on the growth of CuO films by molecular beam epitaxy using mass-separated low-energy O+ beams." Journal of Materials Research 9, no. 5 (May 1994): 1280–83. http://dx.doi.org/10.1557/jmr.1994.1280.

Full text

Abstract:

We have studied the effects of the kinetic energy of mass-separated O+ beams on the growth of CuO thin films deposited on unheated MgO(001) and at 510 °C, in energy ranging from 10 to 200 eV by x-ray photoemission spectroscopy, x-ray diffraction, reflection high-energy electron diffraction, and scanning electron microscopy. The films deposited at 510 °C show a full width at the half maximum (FWHM) of 0.06°for the rocking curve through the (111) peak, regardless of the kinetic energy of oxygen ions. CuO has been epitaxially grown on MgO(001) without heating it in a vacuum of 4 × 10−7 Pa. The x-ray diffraction intensity of the CuO(111) increases with an increase in the kinetic energy of O+, and its FWHM approaches that of the CuO film grown at 510 °C. The surface morphology is improved for the films deposited on unheated substrates.

APA, Harvard, Vancouver, ISO, and other styles

44

Yang, Fan, Wanqi Jie, Miao Wang, Xiaolong Sun, Ningbo Jia, Liying Yin, Boru Zhou, and Tao Wang. "Growth of Single-Crystal Cd0.9Zn0.1Te Ingots Using Pressure Controlled Bridgman Method." Crystals 10, no. 4 (March 31, 2020): 261. http://dx.doi.org/10.3390/cryst10040261.

Full text

Abstract:

We report growth of single-crystal Cd0.9Zn0.1Te ingots while using the pressure-controlled Bridgman method. The Cd pressure was controlled during growth to suppress its evaporation from the melt and reduce the size of Te inclusions in the as-grown crystals. The accelerated crucible rotation technique (ACRT) was used to suppress constitutional supercooling. The fast accelerating and slow decelerating rotation speeds were optimized. Two-inch Cd0.9Zn0.1Te single-crystal ingots without grain boundaries or twins were grown reproducibly. Glow discharge mass spectrometry results indicate the effective segregation coefficients of Zn and In dopants are 1.24 and 0.18, respectively. The full width half maximum (FWHM) of X-ray rocking curve was approximately 22.5 ″, and the IR transmittance was approximately 61%, indicating high crystallinity. The mean size of the Te inclusions was approximately 13.4 μm. Single-crystal wafers were cut into 5 × 5 × 2 mm3 slices and then used to fabricate gamma ray detectors. The energy resolution and peak-to-valley ratio maps were constructed while using 59.5 keV gamma ray measurements, which proved the high uniformity of detection performance.

APA, Harvard, Vancouver, ISO, and other styles

45

Fauziati, Fauziati, Eldha Sampepana, and Tatik Purwanti. "Identifikasi dan Karakteristik Komponen Aktif Pewarna Alami dari Bahan Secang, Bawang Tiwai dan Kunyit Pada Produk Kacang Goyang." Jurnal Riset Teknologi Industri 8, no. 16 (August 19, 2016): 141–55. http://dx.doi.org/10.26578/jrti.v8i16.1625.

Full text

Abstract:

Synthetic dyes are still widely used, especially the food industry and household industries often use exceeds the set limit so veryharmful to consumers because they interfere with the health, whereas the source of natural dyes derived from plants and herbs are commonly found around us. Rocking peanut products manufactured by SMEs "Cici" in Tenggarong started using natural dyes namely Onions Tiwai (Eleutherine palmifolia), Secang (Caesalpinia sappan L.) and Turmeric (Curcumae domesticae R.) and this study aims to investigate the characteristics of the active components contained on the plantby adding each as 25 g, 50 g and 75 g in 200 ml of water. Further included in the solution of sugar to water ratio: 100 ml sugar : 800 gr. The sugar solution is used in the manufacture of peanut shake. Furthermore rocking peanut products were analyzed using Gas Cromatography-Mass Spectrometry (GC-MS). Based on the results of the chemical analysis of components in the GC-MS, nuts rocking the natural dye compounds containing 1,3,5-Benzenetriol atau phloroglucinol, Octadec-9-enoic acid, 9-octadecanoic acid, red oil, Butyl Hydroxy Toluene ; 4-vinylphenol , phenol ; 2,6-Bis (1,1-Dimethylethyl)-4-Methyl gamma tecoperol, squalen, gamma-tecoperol, .delta.-tecoferol, o-methyl-, vitamin E, dl-alpha.-Tocopherol, (+/-)-alpha.-Tecopherol, alpha.-Tocopheryl acetat, campe sterol, sito sterol and fuco streol in which these compounds function as a drugand supplement the brain.ABSTRAK Pewarna sintetis masih banyak digunakan industri pangan khususnya industri rumah tanggadan penggunaannya seringkali melebihi batas ditetapkan sehingga sangat merugikan konsumen karena mengganggu kesehatan. Untuk itu dilakukan pencarian sumber pewarna alami yang berasal dari tumbuhan yang banyak ditemukan di sekitar kita. Produk kacang goyang yang diproduksi oleh UKM “Cici” di Tenggarong mulai menggunakan pewarna alami yaitu Bawang Tiwai (Eleutherine palmifolia), Secang (Caesalpinia sappan L.) dan Kunyit (Curcumae domesticae R.). Penelitian ini bertujuan untuk mengetahui karakteristik komponen aktif pewarna alami yang ada dalam kacang goyang dengan menambahkan masing-masing sebanyak 25 g, 50 g dan 75 g dalam 200 ml air. Selanjutnya dimasukkan dalam larutan gula dengan perbandingan air : gula sebesar 100 ml : 800 g lalu digunakan dalam pembuatan kacang goyang. Selanjutnya produk kacang goyang dianalisis dengan menggunakan gas cromatography mass spektrometry (GC-MS). Berdasarkan hasil analisa karakteristik komponen senyawa kimia kacang goyang mengandung senyawa 1,3,5-Benzenetriol atau phloroglucinol, Octadec-9-enoic acid, 9-octadecanoic acid, red oil, Butyl Hydroxy Toluene ; 4-vinylphenol , phenol ; 2,6-Bis (1,1-Dimethylethyl)-4-Methyl gamma tecoperol, squalen, gamma-tecoperol, .delta.-tecoferol, o-methyl-, vitamin E, dl-alpha.-Tocopherol, (+/-)-alpha.-Tecopherol, alpha.-Tocopheryl acetat, campe sterol, sitosterol dan fuco streol yang dimana senyawa ini berfungsi sebagai pewarna, antioksidan, pengawet, obat dan suplemen otak. Kata Kunci : Bawang Tiwai, pewarna alami, Kacang Goyang, Kunyit, Secang

APA, Harvard, Vancouver, ISO, and other styles

46

Chour, Kueir Weei, and Ren Xu. "Autostoichiometric vapor deposition: Part II. Experiment." Journal of Materials Research 10, no. 10 (October 1995): 2542–47. http://dx.doi.org/10.1557/jmr.1995.2542.

Full text

Abstract:

An autostoichiometric vapor deposition method is implemented to achieve deposition of stoichiometric LiTaO3 using LiTa(OButn)6 precursor. Precisely stoichiometric LiTaO3 can be grown by this method. A simple low pressure reactor is used to facilitate the autostoichiometric vapor deposition through hydrolysis polycondensation of double alkoxides in the vapor phase. Typical deposition and annealing conditions are described. X-ray diffraction, SEM, and compositional analyses are performed on the films grown on fused silica, Pt, (100) sapphire, and LiNbO3(001). Rocking curve measurements indicated excellent epitaxial growth of LiTaO3 on (100) sapphire. Compositional analysis by measurement of lattice parameters confirmed that the present method can produce high quality stoichiometric LiTaO3. The nonstoichiometry factor for LiTa(OButn)6 is negligible. Mass spectrometric study of the precursor compound LiTa(OButn)6 suggests that the volatile species is Li2Ta2(OButn)12.

APA, Harvard, Vancouver, ISO, and other styles

47

Kim, Hyun-Uk, Jeong-Gon Ha, Kil-Wan Ko, and Dong-Soo Kim. "Optimization of Two Soil–Structure Interaction Parameters Using Dynamic Centrifuge Tests and an Analytical Approach." Sustainability 12, no. 17 (August 31, 2020): 7113. http://dx.doi.org/10.3390/su12177113.

Full text

Abstract:

The response of the structure subjected to an earthquake load is greatly affected by the properties of the structure and soil so it is very important to accurately determine the characteristics of the structure and soil for analysis. However, studies on the effective profile depth where soil properties are determined, have been conducted in the presence of restricted conditions (i.e., surface foundation, linear soil properties), and without any considerations on damping. In case of the effective height of structure that affects its rocking behavior, it was only theoretically or empirically determined. In addition, most previously published studies on soil–structure interaction (SSI) focused on limited effects and parameters (e.g., rocking behavior, embedment effect, effective profile depth, spring constant, and damping coefficient) and not on comprehensive SSI parameters. Furthermore, no detailed validation procedure has been set in place which made it difficult to validate the SSI parameters. Since the effective height of structure and effective profile depth are the basis of all the input parameters of SSI analysis, it is important to validate and determine them. Therefore, in this study, the procedure used to optimize the two SSI parameters was established based on an analytical approach that considered all the possible SSI parameters that were investigated from conventional codes and studies and physical model tests. As a result of this study, the optimum values of the effective height of the structure and effective profile depth were respectively determined according to (a) the height from the bottom part of the foundation to the center of the mass of the superstructure, and according to (b) the depth at values equal to four times the radius of the foundation.

APA, Harvard, Vancouver, ISO, and other styles

48

de Leo, A. M., G. Simoneschi, C. Fabrizio, and A. Di Egidio. "On the use of a pendulum as mass damper to control the rocking motion of a rigid block with fixed characteristics." Meccanica 51, no. 11 (June 7, 2016): 2727–40. http://dx.doi.org/10.1007/s11012-016-0448-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Lei, Zuotao, Aleksei Kolesnikov, Anton Vasilenko, Chongqiang Zhu, Galina Verozubova, and Chunhui Yang. "Structural defects in ZnGeP2single crystals revealed by X-ray topography." Journal of Applied Crystallography 51, no. 4 (June 12, 2018): 1043–49. http://dx.doi.org/10.1107/s1600576718006726.

Full text

Abstract:

The results of X-ray transmission topography and diffraction analysis of a ZnGeP2single crystal grown by the vertical Bridgman method in the [001] direction are presented and discussed. The FWHM of rocking curves over a large area of a (100) longitudinal slice is about 12′′, which is indicative of the high quality of the examined sample. Glow discharge mass spectrometry does not show significant content of foreign chemical elements. X-ray topography reveals growth striations and dislocations. The predominant defects are single dislocations and their pile-ups. Near to the growth-axis region, curved dislocation bundles passing through the entire crystal are observed, on which precipitates are formed. In the initial part of the crystal, dislocations are located chaotically, while towards the middle of the sample they are aligned along the growth striae. In the final part of the crystal, the dislocation density increases.

APA, Harvard, Vancouver, ISO, and other styles

50

Peterman, David J., Ryan Shell, Charles N. Ciampaglio, and Margaret M. Yacobucci. "Stable hooks: biomechanics of heteromorph ammonoids with U-shaped body chambers." Journal of Molluscan Studies 86, no. 4 (August 20, 2020): 267–79. http://dx.doi.org/10.1093/mollus/eyaa018.

Full text

Abstract:

ABSTRACT The biomechanics of uncoiled heteromorph ammonoids with body chambers that terminate in U-shaped hooks (ancylocones) were investigated with virtual and physical models of Audouliceras renauxianum. Virtual models were used to compute the hydrostatic properties of this morphotype. Audouliceras has the capacity for neutral buoyancy and this suggests that other taxa with similar proportions had this ability as well. Hydrostatic stability gradually increases during ontogeny, coincident with the larger degree of uncoiling. The juvenile planispiral stage has a similar stability and apertural orientation to the extant Nautilus. The adult stage, however, undergoes an increase in stability by a factor of over 3, while assuming an upward-facing posture. Counterintuitively, the stage during the formation of the shaft (before the growth of the U-shaped hook) is oriented horizontally. This intermediate stage would have had poor horizontal mobility due to the positioning of the hyponome below the centre of mass. The juvenile planispiral stage and mature stage, however, would have been well suited to horizontal backward movement with minimal rocking. Ancylocones are generally thought of as quasiplanktic vertical migrants. Thus, their relative horizontal swimming ability has been largely disregarded. Experiments on 3D printed, neutrally buoyant physical models reveal that hydrodynamic drag is indeed larger compared to Nautilus. However, Audouliceras could reach similar maximum horizontal velocities depending on the available thrust. Sepia-like thrusts yield velocities similar to equivalently sized Nautilus (c. 15 cm/s), while Nautilus-like thrusts yield velocities not much lower (c. 11 cm/s). Due to the hydrostatic properties of the ancylocone, the adult model undergoes less rocking (±4.5°) during movement than Nautilus (±10°). The minimal hydrodynamic consequences for ancylocones suggest that stability, orientation and directional efficiency are key selective pressures for some heteromorph shells, which may have primarily served as hydrostatic devices.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!