Journal articles: 'Rotation capacity'

1

Xu, Y. L., and S. Franconeri. "The capacity of mental rotation." Journal of Vision 14, no. 10 (August 22, 2014): 359. http://dx.doi.org/10.1167/14.10.359.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

King, G. J. W., and M. Laman. "Conventional and centrifuge model studies of the moment carrying capacity of short pier foundations in clay." Canadian Geotechnical Journal 32, no. 6 (December 1, 1995): 976–88. http://dx.doi.org/10.1139/t95-096.

Full text

Abstract:

An experimental investigation into the moment carrying capacity of short rigid pier foundations in saturated clay is described. Scale models of square piers with different breadths and depths were used in both conventional and centrifugal studies. The results show that the relationships between moment and rotation are nonlinear but do not exhibit any peak values, and that moment limits, defined by limiting angular rotations, increase with increases in pier depth and breadth. Empirical equations are derived between moment carrying capacity and pier geometry, for a range of limiting rotations, and a very close fit is demonstrated between the moment–rotation relationships obtained using these equations and the actual data obtained from the model tests. It is shown that, at the same pier rotations, the moment carrying capacities observed in the centrifugal model tests are significantly larger than those in the conventional model tests. Numerical analyses of the prototype geometries were also carried out using a three-dimensional nonlinear finite-element computer program. The results are shown to provide satisfactory agreement with the moment–rotation behaviour and working limits observed in the centrifuge model tests. Thus, even though conventional modelling is usually legitimate for determining the immediate bearing capacity of rigid foundations in saturated clay, their rotational stability is shown to be significantly affected by self-weight stresses. Some of the existing methods for designing short piers subjected to moments are examined and compared with the results from the centrifuge model tests. Key words : pier foundation, clay, moment capacity.

APA, Harvard, Vancouver, ISO, and other styles

3

Riva, P., and M. Z. Cohn. "Rotation capacity of structural concrete members." Magazine of Concrete Research 46, no. 168 (September 1994): 223–34. http://dx.doi.org/10.1680/macr.1994.46.168.223.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Lafuente, Guillermo, Pedro V. Munuera, Gabriel Dominguez, Maria Reina, and Blanca Lafuente. "Hallux Limitus and Its Relationship with the Internal Rotational Pattern of the Lower Limb." Journal of the American Podiatric Medical Association 101, no. 6 (November 1, 2011): 467–74. http://dx.doi.org/10.7547/1010467.

Full text

Abstract:

Background: The aims of this study were to determine whether individuals with mild hallux limitus show a diminished capacity of internal rotation of the lower limb compared with those without hallux limitus and whether individuals with mild hallux limitus show an increased foot progression angle. Methods: In 80 study participants (35 with normal feet and 45 with mild hallux limitus), the capacity of internal rotation of the lower limb (internal rotational pattern), hallux dorsiflexion, and the foot progression angle were measured. The values for internal rotational pattern and foot progression angle were compared between the two study groups, and the correlations between these variables were studied. Results: The capacity of internal rotation of the lower limb was significantly lesser in patients with mild hallux limitus (P < .0001). There was no significant difference in foot progression angle between the two groups (P = .115). The Spearman correlation coefficient was 0.638 (P < .0001) for the relationship between internal rotational pattern and hallux dorsiflexion. Conclusions: Patients with mild hallux limitus had a lesser capacity of internal rotation of the lower extremity than did individuals in the control group. The more limited the internal rotational pattern of the lower limb, the more limited was hallux dorsiflexion. The foot progression angle was similar in both groups. (J Am Podiatr Med Assoc 101(6): 467–474, 2011)

APA, Harvard, Vancouver, ISO, and other styles

5

Li, Jingyuan, and Zifeng Li. "Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions." Applied Physics Research 8, no. 2 (February 15, 2016): 22. http://dx.doi.org/10.5539/apr.v8n2p22.

Full text

Abstract:

<p class="1Body">The theory of lubrication of a radial sliding bearing is extended to three cases: the shaft neck rotation and bush rotation bearing, the rotating load bearing, and the floating sleeve bearing. For the bearing with rotating shaft neck and rotating bush, fixing the observer at the bushing can enable the determination, in a simple and more accurate manner, of the bearing capacity of the bearing with the rotating load. As long as a rotating load exists, whirl exists; if the shaft rotation speed is 2 times the load rotation speed, then the eccentricity reaches the maximum.</p>

APA, Harvard, Vancouver, ISO, and other styles

6

Matz, Radosław, Ryszard Błażejewski, Tadeusz Nawrot, and Maciej Pawlak. "Hydraulic Capacity and Efficiency of a Low-Speed Nonpressurized Coil Pump." Water 11, no. 8 (August 10, 2019): 1659. http://dx.doi.org/10.3390/w11081659.

Full text

Abstract:

The paper presents the results of an investigation on hydraulics of a low-speed coil pump for transport of liquids. One of the pump’s advantages is its wide range of potential inclination angles for its rotating shaft, from the horizontal to an almost vertical position. A simplified hydraulic model was developed based on kinematic and geometrical considerations to determine the pump capacity. The model was verified under laboratory conditions using a low-speed coil pump composed of transparent PVC tube (15 mm outer diameter) wound around a cylindrical drum (104 mm external diameter; 550 mm long). Laboratory tests were performed for three angles of inclination of the axis of rotation (20°, 40°, and 60°) and four rotational speeds (10, 20, 30, and 40 rpm). The results of the tests showed satisfactory agreement with the hydraulic model predictions. Energetic efficiency was estimated on the base of electric power measurements and difference of water levels in the two arms of rotating transparent torus, partly filled with water. The hydraulic efficiency of the coil pump is increasing with decreasing rotational speed.

APA, Harvard, Vancouver, ISO, and other styles

7

Dalen, Karl Van, and John MacIntyre. "The rotational behaviour of clipped end plate connections." Canadian Journal of Civil Engineering 15, no. 1 (February 1, 1988): 117–26. http://dx.doi.org/10.1139/l88-013.

Full text

Abstract:

The rotational behaviour of clipped end plate connections was studied by subjecting nine clipped and three conventional or “unclipped” specimens with varying connection geometry to combined shear and moment and obtaining the corresponding moment–rotation characteristics. It was found that the clipped end plate connections in this investigation had more than adequate rotation capacity to permit an interior beam connected to a supporting member by this type of connection to achieve its full plastic moment, provided the length-to-depth ratio of the beam does not exceed 20. For the range of rotations that would be experienced by clipped end plate connections in a practical structure, a model originally developed to predict the moment–rotation behaviour of conventional shear end plate connections was modified so as to be applicable to clipped end plate connections. Good agreement was obtained between the test values and those predicted by the modified model. No adverse effect on the rotational behaviour of the connections was observed to result from the asymmetry caused by clipping the end plate. Key words: beams, bolts, columns, connections, fillet welds, limit states design, moment, rotation, shear tests, steel construction.

APA, Harvard, Vancouver, ISO, and other styles

8

Slătineanu, Laurenţiu, Oana Dodun, Margareta Coteaţă, Gheorghe Nagîţ, and Irina Beşliu. "Simplified Version of Polymer Rotational Molding Manufacturing Method." Key Engineering Materials 699 (July 2016): 97–103. http://dx.doi.org/10.4028/www.scientific.net/kem.699.97.

Full text

Abstract:

Rotational molding is a manufacturing method which supposes the rotation of the mold, during the solidification of the liquid phase material, so that finally a part having a hollow could be obtained. The method could be applied in manufacturing of metallic and nonmetallic parts. Usually, the equipment for rotational molding ensures slow speed rotating of the mold around two axes placed perpendicularly each other and this fact led to relatively complex equipment for achieving rotational molding. The capacity of the liquid material to entirely cover the internal walls of the mold depends essentially on the liquid material viscosity, on the rotation speed and on the movements applied to the mold. Simplified equipment including a single rotation movement could be materialized. In order to test such a solution, a preliminary experiment was designed and materialized, by using a device adapted on universal lathe. Thus, the objective of the research presented in the paper was to study if it is possible to achieve plastic parts made by rotational molding using a single rotation movement. A polyurethane resin obtained from two liquid components was used in order to obtain the liquid material that could be introduced in the mold. The research results proved the possibility to use simplified equipment for achieving a rotational molding process, at least in certain cases and with some technological limits.

APA, Harvard, Vancouver, ISO, and other styles

9

Xu, Yangqing, and Steven L. Franconeri. "Capacity for Visual Features in Mental Rotation." Psychological Science 26, no. 8 (July 14, 2015): 1241–51. http://dx.doi.org/10.1177/0956797615585002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Beg, Darko, Erik Zupančič, and Ioannis Vayas. "On the rotation capacity of moment connections." Journal of Constructional Steel Research 60, no. 3-5 (March 2004): 601–20. http://dx.doi.org/10.1016/s0143-974x(03)00132-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Ostrowski, Krzysztof, and Aleksander Kozłowski. "Rotation Capacity of Bolted Flush End-Plate Stiffened Beam-to-Column Connection." Civil and Environmental Engineering Reports 25, no. 2 (June 1, 2017): 173–84. http://dx.doi.org/10.1515/ceer-2017-0028.

Full text

Abstract:

Abstract One of the flexibility parameters of semi-rigid joints is rotation capacity. Plastic rotation capacity is especially important in plastic design of framed structures. Current design codes, including Eurocode 3, do not posses procedures enabling designers to obtain value of rotation capacity. In the paper the calculation procedure of the rotation capacity for stiffened bolted flush end-plate beam-to-column connections has been proposed. Theory of experiment design was applied with the use of Hartley’s PS/DS-P:Ha3 plan. The analysis was performed with the use of finite element method (ANSYS), based on the numerical experiment plan. The determination of maximal rotation angle was carried out with the use of regression analysis. The main variables analyzed in parametric study were: pitch of the bolt “w” (120-180 mm), the distance between the bolt axis and the beam upper edge cg1 (50-90 mm) and the thickness of the end-plate tp (10-20 mm). Power function was proposed to describe available rotation capacity of the joint. Influence of the particular components on the rotation capacity was also investigated. In the paper a general procedure for determination of rotation capacity was proposed.

APA, Harvard, Vancouver, ISO, and other styles

12

Ram, Basta, Ajeet Pratap Singh, Veer Singh, Navneet Pareek, and Poonam Gautam. "Long term effect of different crop rotations on soil physical properties in a Mollisol." Journal of Phytopharmacology 11, no. 1 (February 25, 2022): 7–11. http://dx.doi.org/10.31254/phyto.2022.11102.

Full text

Abstract:

The present study was conducted for the study about the effect of different rotations on physical properties in a Mollisol. The study area was located at Norman E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar, which lies at 290N latitude, 790 3’ E longitude and 243.84 m above the mean sea level altitude. The crop rotation selected for study were T1 (Rice- Wheat-Fallow) T2 (Rice- Vegetable pea- Summer Rice) T3 (Maize- Wheat- Cowpea) T4 (RiceWheat- Sesbania) T5 (Maize- Toria- Urd) T6 (Rice- Yellow Sarson- Grain Cowpea) T7 (Multi-Cut Sorghum- Barseem + Oat- Maize + Cowpea) T8 (Napier + Fodder cowpea- Barseem- Fodder cowpea) T9 (Basmati rice- Potato- Maize Cob) T10 (Maize- Broccoli- Okra) T11 (fallow (uncultivated land)). The soil sample was collected from 20cm depth for the study of soil physical properties (soil color, soil texture, bulk density, particle density, porosity, and water holding capacity). Among the different crop rotations, T4 treatment was obtained a significantly high value (except bulk density) of soil texture, particle density, porosity, and water holding capacity. T11 (except bulk density) treatment was obtained a significantly lowest value of soil texture, particle density, porosity and water holding capacity Results indicated that soil under Sesbania rotation was found superior with respect to soil physical properties followed by other crop rotation and the uncultivated land. By taking a crop for a long time on same and using chemical fertilizers that are decrease of soil physical properties. Therefore, in this experiment taking different crop rotations. under the different crop rotations, soil physical properties influenced positively and especially the green manure cycle has had the greatest positive impact. According to experimental data concluded that incorporation of green manure crop rotations was effect more positive an effect on soil physical properties. Crop rotations and green manure crops are improved soil physical properties and soil health.

APA, Harvard, Vancouver, ISO, and other styles

13

Lopes, S. M. R. "Plastic rotation capacity of high-strength concrete beams." Materials and Structures 36, no. 255 (November 27, 2002): 22–31. http://dx.doi.org/10.1617/13736.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Odenbreit, Christoph, and Christoph Hahn. "Bending Resistant Composite Joints for High Rotation Capacity." IABSE Symposium Report 92, no. 29 (January 1, 2006): 9–16. http://dx.doi.org/10.2749/222137806796168994.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

SATO, Atsushi, and Tetsuro ONO. "ROTATION CAPACITY OF THE BEAM-TO-COLUMN CONNECTIONS." Journal of Structural and Construction Engineering (Transactions of AIJ) 71, no. 600 (2006): 171–78. http://dx.doi.org/10.3130/aijs.71.171_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

BERNARDO, Luís F. A., Miguel C. S. NEPOMUCENO, and Hugo A. S. PINTO. "PLASTIC ROTATION CAPACITY OF LIGHTWEIGHT-AGGREGATE CONCRETE BEAMS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 22, no. 8 (January 28, 2016): 1032–41. http://dx.doi.org/10.3846/13923730.2014.946442.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Hemmati, Ali, Ali Kheyroddin, and Mohammad Kazem Sharbatdar. "Plastic Hinge Rotation Capacity of Reinforced HPFRCC Beams." Journal of Structural Engineering 141, no. 2 (February 2015): 04014111. http://dx.doi.org/10.1061/(asce)st.1943-541x.0000858.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Mukharsky, Yury M., Talso C. P. Chui, Ranjan Mukhopadhyay, and David Goodstein. "The heat capacity of4He under rotation nearT λ." Czechoslovak Journal of Physics 46, S1 (January 1996): 177–78. http://dx.doi.org/10.1007/bf02569504.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

KATO, Ben. "STRENGTH AND ROTATION CAPACITY OF SHS BEAM-COLUMNS." Journal of Structural and Construction Engineering (Transactions of AIJ) 63, no. 513 (1998): 167–71. http://dx.doi.org/10.3130/aijs.63.167_2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Lopes, S. M. R., and L. F. A. Bernardo. "Plastic rotation capacity of high-strength concrete beams." Materials and Structures 36, no. 1 (January 2003): 22–31. http://dx.doi.org/10.1007/bf02481567.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Popov, I. P. "Stabilized Rotator for Mechatronic Automatic Systems." Mekhatronika, Avtomatizatsiya, Upravlenie 23, no. 10 (October 9, 2022): 523–28. http://dx.doi.org/10.17587/mau.23.523-528.

Full text

Abstract:

The aim of the work is to find a mechanical analogue of cyclotron motion and to determine the scheme of the corresponding device, which is appropriate to call a stabilized rotator. From the key circumstance that determines the possibility of generalizing cyclotron motion to mechanics, which consists in the fact that the Lagrangian of an electron is twice as large as its kinetic energy, which, as applied to a stabilized rotator, should be interpreted as the equality of kinetic and potential energies, it follows that the composition of a stabilized rotator should include elements, which are able to store both of these types of energy, namely, the load and the spring. The natural frequency of rotation of a stabilized rotator is strictly fixed (it does not depend on either the moment of inertia or the moment of momentum) and remarkably coincides with the natural frequency of oscillations of a pendulum with identical parameters. When the angular momentum changes, the radius and tangential velocity change (the rotation frequency does not change and is equal to its own). The position of the load, in which its center of mass coincides with the axis of rotation, corresponds to a state of indefinite equilibrium. During rotation, the load can deviate with equal probability in any of the two directions and, accordingly, both compression and extension of the spring can develop. The state of indefinite equilibrium can be eliminated by providing the initial (static) displacement of the load and the initial deformation of the spring equal to it. Just as the frequency does not coincide with the natural frequency during forced oscillations of the pendulum, the rotation frequency of a stabilized rotator under loading does not coincide with the natural rotation frequency. At zero torque in the stationary mode, the rotational speed of the stabilized rotator cannot be arbitrary and takes on a single value. A stabilized rotator can be used to control the natural frequency of a radial oscillator, although in this capacity it may have strong competition from mechatronic systems. On the contrary, as a rotation stabilizer, its competitive capabilities are undeniable and are determined by the extreme simplicity of the design.

APA, Harvard, Vancouver, ISO, and other styles

22

VEEGER, H. E. J., M. KREULEN, and M. J. C. SMEULDERS. "Mechanical Evaluation of the Pronator Teres Rerouting Tendon Transfer." Journal of Hand Surgery 29, no. 3 (June 2004): 257–62. http://dx.doi.org/10.1016/j.jhsb.2004.01.004.

Full text

Abstract:

We simulated pronator teres rerouting using a three-dimensional biomechanical model of the arm. Simulations comprised the evaluation of changes in muscle length and the moment arm of pronator teres with changes in forearm axial rotation and elbow flexion. The rerouting of Pronator Teres was simulated by defining a path for it through the interosseous membrane with re-attachment to its original insertion. However the effect of moving the insertion to new positions, 2 cm below and above, the original position was also assessed. The effect on total internal rotation and external rotation capacity was determined by calculating the potential moments for pronator teres, supinator, pronator quadratus, biceps brachii and brachioradialis. Pronator teres was found to be a weak internal rotator in extreme pronation, but a strong internal rotator in neutral rotation and in supination. After rerouting pronator teres was only a strong external rotator in full pronation and not at other forearm positions, where the effect of rerouting was comparable to a release procedure.

APA, Harvard, Vancouver, ISO, and other styles

23

Kalita, W., N. Yegani, Cz M. Rodkiewicz, and J. S. Kennedy. "On the Laminar Flow Characteristics of Conical Bearings. Part II—Experimental Verification." Journal of Tribology 108, no. 1 (January 1, 1986): 59–64. http://dx.doi.org/10.1115/1.3261144.

Full text

Abstract:

The laminar flow characteristics of the externally pressurized central recess conical bearings with narrow gaps, predicted theoretically in Part I of this paper, have been verified experimentally. Two main effects on the performance of conical bearings have been investigated, namely: the effect of nonconstant film thickness along the gap of the bearing and the effect of rotation. It was found that experimental pressure distributions and load capacity of the constant and divergent gap bearings were in close agreement with the theoretical data for the low rotational velocities however, with the increased rotation, the experimental values were higher than theoretically predicted. The experimental values of pressure, load capacity, and the torque of convergent gap bearings were found higher than theoretical.

APA, Harvard, Vancouver, ISO, and other styles

24

Yang, Zhijian, Guochang Li, and Bo Nan. "Study on Seismic Performance of Improved High-Strength Concrete Pipe‐Pile Cap Connection." Advances in Materials Science and Engineering 2020 (July 26, 2020): 1–22. http://dx.doi.org/10.1155/2020/4326208.

Full text

Abstract:

Four prestressed high-strength concrete pile- (PHC pile-) pile cap connections under low-cycle loading were tested to study the test phenomena, failure modes, hysteretic performance, ductility, and bearing capacity. The PHC piles were reinforced with steel fiber and deformed bars and CFRP. The tests results showed that the connections were damaged by bending. The concrete of the caps were squeezed to be crushed. The concrete of connection was crushed and formed a hinge joint that resulted in the connection rotating unrestricted, and the rotation capacity of connection increased. The PHC pile reinforced with steel fiber and deformed bars can improve the displacement ductility of the connections. The finite element software ABAQUS was used to simulate the nonlinear behavior of pile-cap connections. The prediction agreed relatively well with the experimental results. The stress and strain of specimens were studied. The connections should be designed with enough rotating capacity and make sure the cap will not be damaged by squeezing or prying due to the rotation of pile end.

APA, Harvard, Vancouver, ISO, and other styles

25

MATVEEV, Aleksey V. "Testing the Hypothesis about the Dependence of the Mass of Electric Machines on the Power and Speed." Elektrichestvo, no. 7 (2021): 4–18. http://dx.doi.org/10.24160/0013-5380-2021-7-4-18.

Full text

Abstract:

The hypothesis stating that the mass of any rotating electric machine is proportional to its power capacity taken to a power of 0.75 and is inversely proportional to the square root of its rotation frequency is tested. The testing is carried out on the material of permanent magnet synchronous machines. The inﬂ uence of such factors as voltage, shape of active parts, cooling, eﬃ ciency level, overloads, presence of supporting structures, power supply frequency, and number of poles is studied. The hypothesis is tested by predicting the mass of machines in the widest possible range of power capacities (from 0.03 W to 36 MW) and rotation frequencies (from 2 to 500 000 rpm). The accuracy of the preliminary estimate of the machine mass within about 50% can be considered acceptable, given that the masses of the machines being estimated range from less than a gram to more than 100 t. Based on the study results, the formulation of a new law of electromechanics is proposed, which describes how the machine mass is predetermined in terms of its power capacity and rotation frequency. The ratio of machine power capacity taken to a power of 0.75 to the square root of its rotation frequency is to some extent similar to the “gravity” which the designers try to overcome working on weakening the eﬀ ect of the above-mentioned inﬂ uencing factors.

APA, Harvard, Vancouver, ISO, and other styles

26

MATVEEV, Aleksey V. "Testing the Hypothesis about the Dependence of the Mass of Electric Machines on the Power and Speed." Elektrichestvo 7, no. 7 (2021): 4–18. http://dx.doi.org/10.24160//0013-5380-2021-7-4-18.

Full text

Abstract:

The hypothesis stating that the mass of any rotating electric machine is proportional to its power capacity taken to a power of 0.75 and is inversely proportional to the square root of its rotation frequency is tested. The testing is carried out on the material of permanent magnet synchronous machines. The inﬂ uence of such factors as voltage, shape of active parts, cooling, eﬃ ciency level, overloads, presence of supporting structures, power supply frequency, and number of poles is studied. The hypothesis is tested by predicting the mass of machines in the widest possible range of power capacities (from 0.03 W to 36 MW) and rotation frequencies (from 2 to 500 000 rpm). The accuracy of the preliminary estimate of the machine mass within about 50% can be considered acceptable, given that the masses of the machines being estimated range from less than a gram to more than 100 t. Based on the study results, the formulation of a new law of electromechanics is proposed, which describes how the machine mass is predetermined in terms of its power capacity and rotation frequency. The ratio of machine power capacity taken to a power of 0.75 to the square root of its rotation frequency is to some extent similar to the “gravity” which the designers try to overcome working on weakening the eﬀ ect of the above-mentioned inﬂ uencing factors.

APA, Harvard, Vancouver, ISO, and other styles

27

KEMP, A. R. "QUANTIFYING LIMIT-STATES OF ROTATION CAPACITY IN FLEXURAL MEMBERS." Proceedings of the Institution of Civil Engineers 89, no. 3 (September 1990): 387–406. http://dx.doi.org/10.1680/iicep.1990.9398.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Mazzolan, F. M., and V. Piluso. "Prediction of the Rotation Capacity of Aluminium Alloy Beams." Thin-Walled Structures 27, no. 1 (January 1997): 103–16. http://dx.doi.org/10.1016/0263-8231(96)00014-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Duarte da Costa, Job, Renata Obiala, and Christoph Odenbreit. "Rotation capacity of composite joints for slim‐floor beams." Stahlbau 88, no. 7 (July 2019): 675–84. http://dx.doi.org/10.1002/stab.201900033.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Sternik, Krzysztof, and Katarzyna Dołżyk-Szypcio. "Pullout Capacity Of Cylindrical Block Embedded In Sand." Studia Geotechnica et Mechanica 40, no. 1 (June 5, 2018): 30–37. http://dx.doi.org/10.2478/sgem-2018-0005.

Full text

Abstract:

Abstract Calculation of pullout capacity of anchoring concrete cylindrical block by finite element method is carried out. 3D model of the block assumes its free rotation. Alternative solutions with one and two pulling forces attached at different heights of the block are considered. Dependency of the ultimate pulling force on the points of its application, the block’s embedment depth as well as contact friction are investigated. Results of FE analysis and simple engineering estimations are compared. The maximum pullout resistance results from FE analysis when the rotation of the block is prevented.

APA, Harvard, Vancouver, ISO, and other styles

31

Kealy, Tim, and Carlos Tiu. "Calibration of a Commercial Kneader for Rheological Applications." Applied Rheology 12, no. 5 (October 1, 2002): 241–51. http://dx.doi.org/10.1515/arh-2002-0013.

Full text

Abstract:

Abstract In the case of some highly viscous fluids, or thick pastes (such as those exhibiting high yield stress and/or high plastic viscosity), neither rotational nor tube type viscometers are suitable for rheological characterisation. Due to their capacity for generating and maintaining high torque or high rates of rotation, kneaders and mixers can often engender shear rates in excess of those of conventional rotational viscometers. Often these devices are instrumented, to measure and record the rate of rotation of the mixing blades and the related torque on the shaft turning the blades. The major problem facing users of these mixers lies in data interpretation, specifically in relating rate of rotation and torque data to shear rate and shear stress respectively. If it were possible to obtain such relationships, useful rheological data could be generated with instrumented mixers.

APA, Harvard, Vancouver, ISO, and other styles

32

Zhang, Yufen, Jiaqi Gao, Yushuo Li, and Krushar Demoha. "Experimental analysis of hysteretic behavior and strain field of external diaphragm joints between steel beams and CFDST columns." Advances in Structural Engineering 23, no. 6 (November 27, 2019): 1129–41. http://dx.doi.org/10.1177/1369433219888747.

Full text

Abstract:

External diaphragm joints with high structural reliability are used widely in composite steel and concrete structures. In this study, the external diaphragm joint was improved to be a steel beam-to-concrete filled double steel tubular column connection. The digital speckle correlation method was used to measure and investigate the strain field in the panel zone and relative beam-to-column rotation in a low-cycle reciprocating loading test. The obtained hysteresis curves of moment-rotation ( M-θ) and shear force-deformation ( V-[Formula: see text]) showed that the external diaphragm joints had higher strength, higher ductility, and better energy dissipation capacity. Decreasing the axial compression ratio resulted in the deterioration of initial rotational stiffness. Wider external diaphragm produced better ductility and larger initial shear stiffness. The ribbed anchorage web was effective to increase the bending resistance by 10%. Beam-to-column bending stiffness ratio can not only influence the bending resistance and energy dissipation capacity significantly but also affect the shear deformation capacity in the joint core. The magnitude of the shear strain in the panel zone was large, especially for the specimens under column failure mode, and shear deformation in the panel zone should not be neglected for it accounted for 30%–40% of the beam-to-column rotation. Beam-to-column rotation and shear deformation obtained by the digital speckle correlation method offered better predictions to analyze the mechanical behavior of external diaphragm joints in the concrete filled double steel tubular structures.

APA, Harvard, Vancouver, ISO, and other styles

33

Sato, Y., and M. Ochiai. "Flow visualization of non-contacting mechanical seals with bidirectional rotation." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012028. http://dx.doi.org/10.1088/1742-6596/2217/1/012028.

Full text

Abstract:

Abstract Non-contacting mechanical seals are used as a shaft seal in a turbomachinery. A few micrometers thin lubrication film is formed by grooves on the seals. Various groove shapes were presented, and most of these grooves were designed for unidirectional rotation. However, reverse rotation occurs accidentally in the turbomachinery. In this study, the performance of two type unidirectional grooves was investigated by measuring the pressure in a chamber which means sealed fluid pressure and visualizing the flow in the lubrication film with bidirectional rotation. The measurement results of pressure under forward rotation showed that the pressures fluctuated as rotational speeds increased by hydrodynamic pressure. By contrast, under reverse rotation, the amount of fluctuation was smaller and almost not changed with increasing rotational speeds. In addition, the flow visualization results showed the increase of pressure drop areas and occurrence of gas phase. This indicates the decrease in load capacity and film stiffness. In contrast, the discharging flow from inner to outer side or the breakage of the film were confirmed and prevented fluid leaking. In summary, the results showed the degradation of lubrication characteristics though the no degradation of a sealing performance.

APA, Harvard, Vancouver, ISO, and other styles

34

Ishag, Kheiry Hassan M. "Resources Management and Risk Efficiency of Crop Rotation Systems in Sudan Gezira Scheme." Sustainable Agriculture Research 4, no. 4 (August 27, 2015): 38. http://dx.doi.org/10.5539/sar.v4n4p38.

Full text

Abstract:

Risk is an important factor in crop rotation systems and cropping system management studies. The study uses stochastic simulation techniques and Stochastic Efficiency with Respect to Function (SERF) to evaluate five crop rotations risk-efficiency and economic sustainability in Sudan Gezira Scheme. Price and yield risk for five crops were simulated to calculate whole-scheme net return. The analysis shows with the present irrigation system capacity 4 course rotation is the most preferred at lower (ARAC) and the 5 Course rotation (B) with 53% land use intensity achieve water distribution equity and is the most risk efficient crop rotation at upper (ARAC). It is downside risk oriented and resilience crop rotation. The area allocated in 5 Course rotations (B) for cotton crop is 17%, wheat 7%, sorghum 60%, groundnut 4% and fodder crops 12%. Fodder can be grown two times in summer and winter season without creating water shortage problems. However, this will increase net return and increase soil fertilities within the selected crop rotation. The result also shows that return pack to night storage irrigation system needs a risk premium of 36 Million (SDG). The techniques used in this study could be used with any distribution estimates for the uncertain variables to incorporate new crop varieties and research recommendation packages. They also could be modified to account for new information contribution during the decision process and account for dynamic effects and policy adjustment and modification.

APA, Harvard, Vancouver, ISO, and other styles

35

OHI, KENICHI, and JAE-HYOUK CHOI. "HYBRID SIMULATION ON SEMI-RIGID PARTIAL-STRENGTH CONNECTIONS." International Journal of Modern Physics B 20, no. 25n27 (October 30, 2006): 4445–50. http://dx.doi.org/10.1142/s0217979206041495.

Full text

Abstract:

Semi-rigid connections are considered neither completely pinned nor rigid. It is possible to control collapse mode and even the energy absorption capacity of frames during earthquakes. In this paper, (1) hysteretic behavior of end-plate connections subjected to cyclic and earthquake loading and (2) improvement of their rotation capacities are described. Two types of connections are prepared, extended and flush end-plate. Additional specimens of flush type are tested to improve their rotation capacities using high strength bolts with reduced shaft diameter. As a result, the capacity for plastic deformation of the connection is increased two times over those with JIS standard bolts. In case of bolt failure the rotation capacity is well predicted from the bolt elongation capacity.

APA, Harvard, Vancouver, ISO, and other styles

36

VESTBERG, M., S. KUKKONEN, and K. SAARI. "Cropping system impact on soil quality determinants." Agricultural and Food Science 11, no. 4 (January 4, 2002): 311–28. http://dx.doi.org/10.23986/afsci.5733.

Full text

Abstract:

Worldwide interest in soil quality evaluation has increased rapidly throughout the past decade, prompting us to evaluate the long-term impact of four cropping systems on several biological, chemical and physical determinants of soil quality. We hypothesized that after 17 years several of the determinants would show significant differences between conventional cereal and low input/organic rotations. Four crop rotations were imposed on a silt soil from 1982 through 1999. Rotation A was a conventionally managed cereal rotation that received 100% of the recommended mineral fertilizer each year. Rotation B was also managed conventionally from 1982 until 1993, although it received only 50% of the recommended mineral fertilizer. From 1994 through 1999, rotation B was managed as an organic rotation. Rotations C and D were low-input rotations with plant residues returned either untreated (C)or composted (D)from 1982 until 1994.From 1994 through 1999,they were also anaged organically. Significant decreases in extractable phosphorus (P)and potassium were observed in rotations C and D compared with rotation A, presumably because their yearly nutrient inputs were somewhat lower. The amount of soil organic carbon (Corg), soil water holding capacity, the numbers and biomass of earthworms and the microbial biomass carbon and nitrogen were or tended to be higher in low input/organic than in conventionally managed plots. These effects may be in connection with the slightly increased levels of Corg in soil of the organic rotations. Activities of twelve enzymes were strongly affected by sampling time (early-versus late-summer), but much less by long-term management. Litter decomposition, numbers of soil nematodes, arbuscular mycorrhizal (AM)fungal diversity,AM spore density and AM functioning were little affected by rotation. However,AM spore density correlated positively with the high amounts of extractable calcium and P which were a result from excessive liming applied to some plots in 1982. The crucial question to be answered in future is whether plant growth and yield will correlate with the changes in soil properties. This question will be dealt with in a further paper using data from the same experiment.;

APA, Harvard, Vancouver, ISO, and other styles

37

MACHIMDAMRONG, CHAWALIT, EIICHI WATANABE, and TOMOAKI UTSUNOMIYA. "SHEAR BUCKLING OF CORRUGATED PLATES WITH EDGES ELASTICALLY RESTRAINED AGAINST ROTATION." International Journal of Structural Stability and Dynamics 04, no. 01 (March 2004): 89–104. http://dx.doi.org/10.1142/s0219455404001148.

Full text

Abstract:

This paper presents an estimation of the elastic shear buckling capacity of corrugated plates with edges elastically restrained against rotation. The corrugated plate possesses higher shear buckling capacity compared to an unfolded flat plate. It has been used to replace the concrete web in PC box girders in recent bridge constructions in Japan. In this study, the corrugated plate is modelled as an orthotropic Mindlin plate. Elastically rotational restraint on boundary edges is taken into account in the form of rotational springs in the analysis. The prediction of buckling capacities of corrugated plates is carried out by using the Rayleigh–Ritz method, which was proved to be consistent with those as predicted by existing formulas for the limiting cases of simply-supported and clamped edges. The present study covers the more general case of elastically rotational restraint on the boundary edges showing transition curve of plate buckling capacities from the case of simple support to the case of clamped support.

APA, Harvard, Vancouver, ISO, and other styles

38

Carter, M. R. "Long-term influence of compost on available water capacity of a fine sandy loam in a potato rotation." Canadian Journal of Soil Science 87, no. 5 (November 1, 2007): 535–39. http://dx.doi.org/10.4141/cjss06042.

Full text

Abstract:

An improved soil physical structure, associated with organic amendments in crop rotations, can be viewed as an emergent property. A study was conducted to evaluate the effect of applied compost on soil water retention and available water capacity, and other associative soil properties in a long-term 3-yr potato rotation established on a Charlottetown fine sandy loam (Orthic Humo-Ferric Podzol) in Prince Edward Island. Soil samples (0–10 cm) were obtained from two crop phases (barley and potato) during the fourth cycle of the rotation (after four compost applications) in the 12th year of the experiment. Except for particulate N, compost had little effect on soil organic matter. In comparison to the barley phase, a combination of compost and surface tillage in the potato phase was associated with improved soil porosity parameters and increased soil water contents at −33 kPa (“field capacity” ), −100 and −300 kPa matric potential, compared with the no-compost control. These results indicate that compost stabilized the tillage induced soil aggregates and macro-porosity in the potato phase. Regression analysis showed that soil volumetric water content at both −33 and −1500 kPa matric potential was significantly related to soil C concentration, although the soil available water capacity remained unchanged. The results imply that the “non-nutrient” compost effect on potato productivity was related to soil water retention. Key words: Soil water retention, soil physical and biochemical properties, compost amendment, tillage, potato rotation, eastern Canada

APA, Harvard, Vancouver, ISO, and other styles

39

Khan, Mahbub H., and G. Charles Clifton. "Proposed development of a damage-resisting Eccentrically Braced Frame with rotational active links." Bulletin of the New Zealand Society for Earthquake Engineering 44, no. 2 (June 30, 2011): 99–107. http://dx.doi.org/10.5459/bnzsee.44.2.99-107.

Full text

Abstract:

Eccentrically Braced Frames (EBFs) are widely used seismic-resisting systems, as they allow both strength and stiffness to be optimised while providing good ductility capacity. However, in theory they have a low damage threshold in severe earthquakes and post-earthquake repair of conventional EBFs will be difficult and expensive. This paper presents the Numerical Integration Time-History (NITH) analysis of two ten storey EBF buildings; one with a conventional active link and the other with a new form of low damage active link based on rotational sliding bolted plates. The low damage active link can be designed to allow rotation only, or to allow both rotation and axial extension. The conventional active link response in terms of displacement, rotation and inelastic demand was well within the range of the rotational active links under the records considered. The analysis shows that average maximum displacement of the building and rotation of the link for both the rotational and the rotational+extension active links was almost identical. The extension of the rotational active link permitting axial extension was less than 1.5 mm. Axial load demands on the collector beams and braces were similar in the case all three active links. It can be concluded from the analysis that the rotational active link with extension is not required, as the lateral extensions can be accommodated within the rotational plates with nominal clearances in the bolt holes to accommodate the lateral extension.

APA, Harvard, Vancouver, ISO, and other styles

40

Pardo-Vazquez, Jose L., and Jose Fernandez-Rey. "Working Memory Capacity and Mental Rotation: Evidence for a Domain-General View." Spanish journal of psychology 15, no. 3 (November 2012): 881–90. http://dx.doi.org/10.5209/rev_sjop.2012.v15.n3.39381.

Full text

Abstract:

Despite the existence of numerous studies that examined the relationship between working memory capacity and performance in complex cognitive tasks, it remains unclear whether this capacity is domain specific or domain general. In addition, the available empirical evidence is somewhat contradictory. In this work we have studied the role of verbal working memory capacity in a non-verbal task – mental image rotation. If this capacity were domain specific it would be expected that high and low verbal span participants would obtain similar results in the mental rotation task. We have found that this is not the case as the high span participants performed better in terms of both speed and accuracy. Moreover, these differences depended on the processing component of the mental rotation task: the higher the processing requirements the higher the differences as a function of the working memory capacity. Therefore, the evidence presented here supports the domain general hypothesis.

APA, Harvard, Vancouver, ISO, and other styles

41

Ferraioli, Massimiliano. "Progressive Collapse Performance of Steel Beam-to-Column Connections: Critical Review of Experimental Results." Open Construction & Building Technology Journal 15, no. 1 (December 20, 2021): 152–63. http://dx.doi.org/10.2174/1874836802115010152.

Full text

Abstract:

Background: The steel beam-to-column connections are vulnerable structural elements when a building loses one or more of its vertical load-carrying components due to abnormal or accidental loading conditions. After a column is destroyed by abnormal loads, the tensile axial force of the beam gradually increased, while the bending moment decreased, and the load-resistance mechanism shifts from a flexural mechanism to a catenary mechanism, with the axial force becoming the prevailing factor. Aims: This paper investigates the progressive collapse performance of steel beam-to-column connections. While undergoing large deformation, the beam-to-column connections are subjected to moment, shear, and tension in conjunction with high ductility demand. Their behavior under monotonic loading depends on the moment-axial tension interaction and greatly affects the progressive collapse resistance of the structure. This paper presents a critical review of experimental tests of different types of steel beam-column joints (flexible, rigid, and semi-rigid) under a central-column-removal scenario. Methods: The experimental results, including load-deformation relationships, failure modes, and catenary effects, are described in detail. The findings are used to evaluate the rotation capacity of different types of steel beam-to-column connections. The results are compared to the acceptance criteria specified by the main progressive collapse guidelines for several beam-to-column connection categories. Results: In simple (flexible) joints, the stiffness and strength at higher drift angles essentially depend on the tensile capacity of the connection that prevents, in some cases, the full development of the catenary mechanism. The connection depth alone does not seem to be an effective parameter to predict the rotational capacity of beam-to-column connections, since different connections with similar values of the connection depth result in very different values of the maximum rotation capacity. In fully rigid and semi-rigid connections, after the column removal, the flexural resistance controls the behavior at the preliminary phase, and the tensile force is almost zero. With increased downward displacement, the axial tensile force also increases, developing a catenary mechanism. Although the stiffness of rigid and semi-rigid connections is higher than flexible connections, both categories result in similar rotation capacity. Conclusion: In all the simple connections herein considered, the plastic rotation capacity obtained by tests was found much higher than the code recommended values that are probably too conservative. On the contrary, for one rigid and two semi-rigid connections, the values of the plastic rotation capacity obtained by tests are lower than the corresponding recommended values. Thus, the suggested acceptance criteria proved to be out of the conservative side.

APA, Harvard, Vancouver, ISO, and other styles

42

Brescia, Manuela. "Rotation capacity and steel members classification criteria in seismic zones." Pollack Periodica 2, no. 2 (August 2007): 63–73. http://dx.doi.org/10.1556/pollack.2.2007.2.6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Iglay, Raymond B., Phillip D. Jones, Darren A. Miller, Stephen Demarais, Bruce D. Leopold, and L. Wes Burger. "Deer Carrying Capacity in Mid-Rotation Pine Plantations of Mississippi." Journal of Wildlife Management 74, no. 5 (July 2010): 1003–12. http://dx.doi.org/10.2193/2009-362.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Tofade, Toyin S., Mark Brueckl, and Patricia A. Ross. "Clinical Track Program Expansion Increases Rotation Capacity for Experiential Program." American Journal of Pharmaceutical Education 81, no. 8 (October 2017): 5937. http://dx.doi.org/10.5688/ajpe5937.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Jardine, Nicole, and Steven Franconeri. "Capacity for Visual Features in Mental Rotation is Persistently Low." Journal of Vision 18, no. 10 (September 1, 2018): 823. http://dx.doi.org/10.1167/18.10.823.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Cevik, Abdulkadir. "Neuro-fuzzy modeling of rotation capacity of wide flange beams." Expert Systems with Applications 38, no. 5 (May 2011): 5650–61. http://dx.doi.org/10.1016/j.eswa.2010.10.070.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Samui, Pijush, Dookie Kim, and Namrata Kakoti. "Soft Computing Applied to Rotation Capacity of Wide Flange Beams." Iranian Journal of Science and Technology, Transactions of Civil Engineering 42, no. 3 (April 2, 2018): 305–14. http://dx.doi.org/10.1007/s40996-017-0081-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Mali, M. L., and R. M. Korol. "Prediction of local buckling and rotation capacity at maximum moment." Journal of Constructional Steel Research 32, no. 1 (January 1995): 1–13. http://dx.doi.org/10.1016/0143-974x(94)00007-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Li, T. Q., B. S. Choo, and D. A. Nethercot. "Determination of rotation capacity requirements for steel and composite beams." Journal of Constructional Steel Research 32, no. 3 (January 1995): 303–32. http://dx.doi.org/10.1016/0143-974x(95)93900-o.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Ito, Mitsuru, Katsuyoshi Nozaka, Takahiro Shirosaki, and Kenjiro Yamasaki. "Experimental Study on Moment–Plastic Rotation Capacity of Hybrid Beams." Journal of Bridge Engineering 10, no. 4 (July 2005): 490–96. http://dx.doi.org/10.1061/(asce)1084-0702(2005)10:4(490).

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Rotation capacity'

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