Journal articles: 'Strenght check'

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Zygoń, P., and Z. Nitkiewicz. "Specific Bending and Compressive Strenght of Poly(Vinyl Alcohol)-CNT Composites." Archives of Metallurgy and Materials 61, no. 2 (June 1, 2016): 993–96. http://dx.doi.org/10.1515/amm-2016-0169.

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Abstract Carbon nanotubes are one of the strongest materials of unique mechanical, optical, electrical and electronic properties. Because of that they are mainly used as semiconductor materials constituting the reinforcing phase in composite materials. The paper presents properties of polymer composites reinforced with carbon nanotubes (CNT) containing various mixtures of dispersion. Produced composites featured various content carbon nanotubes: 20%, 30%, 40% i 50%. Macroscopic observations were carried out on ready to check composites, if pores exist in the structure and whether the reinforcement has been distributed in the entire volume. Bending and compressive strengths tests were performed and densities of individual composites were measured to determine the specific strength. Composite materials strengthened with carbon nanotubes feature a very low density and a very good mechanical strength, which makes them a good structural material.

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Chen, Wei-Ta, Yu-Chieh Ko, Kwong-Kum Liao, Jen-Chuen Hsieh, Tzu-Chen Yeh, Zin-An Wu, Low-Tone Ho, and Yung-Yang Lin. "Optimal Check Size and Reversal Rate to Elicit Pattern-reversal MEG Responses." Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 32, no. 2 (May 2005): 218–24. http://dx.doi.org/10.1017/s0317167100004005.

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ABSTRACT:Objective:To determine the impact of check size and interstimulus interval (ISI) on neuromagnetic visual cortical responses.Methods:We recorded visual evoked fields to pattern-reversal stimulation with central occlusion in ten subjects. The ~100 ms magnetic activation (P100m) was analyzed by single dipole modeling.Results:With 1 s ISI, P100m strengths increased as check size increased from 15' up to 120' of visual arc, and larger checks elicited less P100m activation. With 120' checks, we found no P100m attenuation as ISI decreased from 4 s to 0.16 s. P100m sources around the calcarine sulcus did not vary with check size or ISI.Conclusions:The magnitude of cortical activation during visual contrast processing is check size-dependent and the 120' checks are optimum for future studies on neuromagnetic visual cortical functions using central-occluded stimulation. The corresponding neuronal activation demonstrated a short refractory period less than 0.16 s. We also found significantly overlapping cortical representation areas for different check sizes or ISIs.

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SOFAT, VIKAS, ANKUSH KHADWAL, and SUMINDER MEERWAL. "An Experimental Study to Check Compressive Strength of Concrete by Using Jute Fibers as Reinforcement." INTERNATIONAL JOURNAL OF EARTH SCIENCES AND ENGINEERING 10, no. 02 (April 26, 2017): 450–54. http://dx.doi.org/10.21276/ijee.2017.10.0248.

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Rohumaa, Anti, Christopher G. Hunt, Mark Hughes, Charles R. Frihart, and Janne Logren. "The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood." Holzforschung 67, no. 7 (October 1, 2013): 779–86. http://dx.doi.org/10.1515/hf-2012-0161.

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Abstract During the rotary peeling of veneer for plywood or the laminated veneer lumber manufacture, checks are formed in the veneer that are as deep as 70–80% of the veneer thickness. The results of this study show that, during adhesive bond testing, deep lathe checks in birch (Betula pendula Roth.) veneer significantly reduce the shear strength and the percent wood failure of phenol-formaldehyde (PF) – bonded plywood. The results also show that specimens tested with the checks pulled open or closed can fail by different mechanisms. Dried rotary peeled birch veneers were sanded to create uniform surfaces with lathe check depths varying from 30% to 90% of veneer thickness. Then, 7-ply plywood was manufactured with a commercial PF resin. After the preparation of the test specimens, the check depth of each specimen was measured microscopically. Subsequently, bond quality was measured according to EN 314. The results show that veneer checking alone can bring EN 314 specimens to the brink of failure even with an excellent adhesive. These findings stress the importance of measuring the depth of lathe checks and considering the orientations of checks during the testing to get a better understanding of bond quality in veneer-based products.

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郭, 良栋. "Radial Load Screw Strength Check Method." Mechanical Engineering and Technology 08, no. 06 (2019): 526–34. http://dx.doi.org/10.12677/met.2019.86061.

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Khoo, P. S., K. L. Chin, P. S. H'ng, E. S. Bakar, C. L. Lee, W. Z. Go, and R. Dahali. "Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs." Royal Society Open Science 6, no. 12 (December 2019): 191763. http://dx.doi.org/10.1098/rsos.191763.

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The peeling of small-diameter rubberwood logs from the current short-rotation practices undoubtedly will produce lower grade veneers compared to the veneers from conventional planting rotation. Hence, this raises the question of the properties of the produced laminated veneer lumber (LVL) from veneers peeled from small-diameter rubberwood logs using the spindleless lathe technology. Different thicknesses of rubberwood veneers was peeled from rubberwood logs with diameter less than 20 cm using a spindleless lathe. Three-layer LVLs were prepared using phenol formaldehyde (PF) adhesive and hot pressed at different temperatures. During the peeling of veneer, lathe checks as deep as 30–60% of the veneer thickness are formed. Owing to deeper lathe check on 3 mm rubberwood veneer, higher pressing temperature significantly increased the gluebond shear strength of the PF-bonded LVL. In addition, lathe check frequency was also shown to influence the bond strength. The presence of higher lathe check frequency on 2 mm veneer increased the wettability, thus facilitating optimum penetration of adhesive for stronger bonding. These findings stress the importance of measuring and considering the lathe check depth and frequency during the lamination process to get a better understanding of bonding quality in veneer-based products.

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Willie-Tyndale, Douladel, Julian McKoy Davis, Desmalee Holder-Nevins, Kathryn Mitchell-Fearon, Kenneth James, Norman K. Waldron, and Denise Eldemire-Shearer. "Predictors of Health Service Utilization Among Older Men in Jamaica." Journals of Gerontology: Series B 74, no. 6 (January 3, 2018): 999–1006. http://dx.doi.org/10.1093/geronb/gbx168.

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Abstract Objectives To determine the relative influence of sociodemographic, socioeconomic, psychosocial, and health variables on health service utilization in the last 12 months. Methods Data were analyzed for 1,412 men ≥60 years old from a 2012 nationally representative community-based survey in Jamaica. Associations between six health service utilization variables and several explanatory variables were explored. Logistic regression models were used to identify independent predictors of each utilization measure and determine the strengths of associations. Results More than 75% reported having health visits and blood pressure checks. Blood sugar (69.6%) and cholesterol (63.1%) checks were less common, and having a prostate check (35.1%) was the least utilized service. Adjusted models confirmed that the presence of chronic diseases and health insurance most strongly predicted utilization. A daughter or son as the main source of financial support (vs self) doubled or tripled, respectively, the odds of routine doctors’ visits. Compared with primary or lower education, tertiary education doubled [2.37 (1.12, 4.95)] the odds of a blood pressure check. Regular attendance at club/society/religious organizations’ meetings increased the odds of having a prostate check by 45%. Discussion Although need and financial resources most strongly influenced health service utilization, psychosocial variables may be particularly influential for underutilized services.

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He, Fa Wei. "Shaft Design Check with AutoCAD-Mechanical." Applied Mechanics and Materials 590 (June 2014): 576–80. http://dx.doi.org/10.4028/www.scientific.net/amm.590.576.

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When doing mechanical design, in order to ensure proper function of crucial parts, not only should the structure be well-designed, but also should strength and rigidity meet the requirement. However, traditional checking methods contain many procedures and are complicated, which makes mistakes easy to occur; and once it goes wrong in any procedure, the design must be carried out again from the start. So, much time and energy of the designers are wasted on checking, and they can’t focus on the design itself. AutoCAD Mechanical is a version of AutoCAD designed specially for mechanical professionals. It contains all the graphic drawing function of AutoCAD, and with its shaft design function, strength, torsion angle and rigidity checks can be carried out easily. Compared with traditional design method, it has the advantage of simpler operation and full-automatic structuralization. Somehow it is not used by many. Hence, with many years of experiences, the author analyses the design and calculation of shaft parts with AutoCAD Mechanical, in hope to help designers release repeated inefficient work, and raise the quality and efficiency of design. Foreword During mechanical design, in order to ensure proper functions and mechanical properties of parts such as shaft, strength check must be carried out. For crucial parts, rigidity and torsion angle checks are also necessary, to ensure the deformations are within allowable range, so as to make sure that the shaft can bear the loads and work properly. However, strength check requires massive knowledge and procedures, as well as complicated calculations, which makes it easy to go wrong. During the calculation, the values of various coefficients should be considered, and once taken improperly, it may lead to vague calculation results, and then the procedure must be carried out again. Undoubtedly, this method makes design efficiency low, and designers must spend much time and concentrations on repeated work, instead of focusing on renovation. However, checking strength of shaft with AutoCAD Mechanical can make the procedures simple and accurate, and raise the efficiency.

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Kumar, S., S. L. Fox, J. Mitchell Fetch, D. Green, T. Fetch, B. McCallum, R. Aboukhaddour, and M. A. Henriquez. "AAC LeRoy Canada Western Red Spring wheat." Canadian Journal of Plant Science 99, no. 6 (December 1, 2019): 997–1005. http://dx.doi.org/10.1139/cjps-2019-0184.

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AAC LeRoy (BW1049) is a hollow stemmed, awned, high-yielding Canada Western Red Spring (CWRS) wheat suited to the growing conditions in western Canada. AAC LeRoy was 10% higher yielding than Unity, the highest yielding check in the Central Bread Wheat Cooperative registration trials (2015–2017). Within the same test, AAC LeRoy was 13% higher yielding than Carberry, a popular CWRS wheat variety across the Canadian Prairies. AAC LeRoy matured 2 d earlier than Carberry and 1 d later than Unity, the earliest maturing check suited for eastern prairie growing conditions. AAC LeRoy was 6 cm shorter with better stem strength than Unity. The lodging score for AAC LeRoy was lower than the mean of the checks. The test weight of AAC LeRoy was similar to the mean of the checks. Over the 3 yr of testing (2015–2017), the 1000-kernel weight of AAC LeRoy was higher than all of the checks, with a grain protein content 0.6% units lower than Carberry. AAC LeRoy was rated as moderately resistant to Fusarium head blight (Fusarium graminearum Schwabe), leaf rust (Puccinia triticina Erikss.), stripe rust (Puccinia striiformis Westend.), and stem rust (Puccinia graminis Pers. f. sp. tritici Erikss. & E. Henn), including the Ug99 family of stem rusts. It also had a resistant reaction to loose smut [Ustilago tritici (Pers.) Rostr.] and an intermediately resistant reaction to common bunt [Tilletia caries (DC.) Tul. & C. Tul.]. AAC LeRoy was resistant to orange wheat blossom midge (Sitodiplosis mosellana Géhin). AAC LeRoy was registered under the CWRS market class.

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Li, Yongxiang, Weiqiang Xia, Liwen Nan, Youjia Zhao, and Fujin Yu. "Strength Check Analysis for Gear Shaft of Automobile Transmission." Research Journal of Applied Sciences, Engineering and Technology 6, no. 17 (September 20, 2013): 3222–33. http://dx.doi.org/10.19026/rjaset.6.3627.

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AKASHI, Hirokazu, Takuro MORI, Atsushi TABUCHI, Iwao MIYOSHI, and Kento TAKUMA. "Bending Strength of Members in Existing Wooden Check Dams." Journal of the Society of Materials Science, Japan 64, no. 5 (2015): 387–92. http://dx.doi.org/10.2472/jsms.64.387.

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Rola, Edyta. "Steering knuckle strength check by the finite element method." Mechanik, no. 11 (November 2015): 886–89. http://dx.doi.org/10.17814/mechanik.2015.11.526.

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Rivkin, E. Yu, Yu I. Zvezdin, and G. V. Vasil'chenko. "Experimental check of existing methods of fracture strength analysis." Materials Science 30, no. 3 (1995): 357–67. http://dx.doi.org/10.1007/bf00569688.

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Mo, Han Ning, Hong Bing Xin, Deng Qi Cui, Wen Jing Wang, Jian Cheng Gao, Long Liu, Tan Wang, and Yue Fei Xin. "Fatigue Strength Check of Flexspline with Inner and Outer Gear Ring of the Micro Harmonic Drive." Advanced Materials Research 774-776 (September 2013): 140–43. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.140.

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The fatigue strength check of the flexspline is the premise and basis of the design of harmonic drive. Fatigue strength of the flexspline with inner and outer gear ring of micro harmonic drive are checked.Through the check calculation and finite element analysis, fatigue strength of inner and outer gear ring can meet the strength requirements.

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Bo, Zhou, Liu Yujun, and Ji Zhuoshang. "Strength Analysis of Lifting Padeye Based on Curved Beam Theory." Journal of Ship Production 24, no. 04 (November 1, 2008): 196–201. http://dx.doi.org/10.5957/jsp.2008.24.4.196.

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The lifting padeyes are widely used in the construction of offshore structures and ships. Because of the lack of more accurate information, heavily conservative simplified approaches have to be applied to strength analysis and structure design. Therefore, the calculated stress results contain a lot of discrepancies with the actual stress. In the paper, the external loads on the padeyes are analyzed and a robust stress check formula is derived using curved beam theory. The results of finite element method (FEM) and the solutions of traditional check formula and new check formula are compared. It is shown that the new expressions account for a better representation of the real stress value and distribution. By applying the strength check formula presented in the paper, the safe reliability of structure design can be improved significantly.

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Khan, Sadaqat Ullah, Muhd Fadhil Nuruddin, and Nasir Shafiq. "Strength Development of Concrete Incorporating Metakaolin and PVA Fibres." Applied Mechanics and Materials 567 (June 2014): 505–10. http://dx.doi.org/10.4028/www.scientific.net/amm.567.505.

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Study has been conducted to investigate the effect of aspect ratio and volume fraction of PVA fibres on the mechanical properties of concrete. Total eighteen (18) mixes of concrete have been examined using metakaolin up to 5% and PVA fibres of aspect ratio 45, 60, 90 and 120 with volume fraction 1 to 2%. Compressive strength, splitting tensile strength and flexural strength at 7 days and 28 days have been determined to check the effect of volume fraction and the aspect ratio of PVA fibres. It has been found that 2% volume fraction is better than 1% and there is increasing trend up to a certain value of aspect ratio in the strengths of concrete.

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Gibb, Sheree, Barry Milne, Nichola Shackleton, Barry J. Taylor, and Richard Audas. "How universal are universal preschool health checks? An observational study using routine data from New Zealand’s B4 School Check." BMJ Open 9, no. 4 (April 2019): e025535. http://dx.doi.org/10.1136/bmjopen-2018-025535.

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ObjectivesWe aimed to estimate how many children were attending a universal preschool health screen and to identify characteristics associated with non-participation.DesignAnalysis of population-level linked administrative data.ParticipantsChildren were considered eligible for a B4 School Check for a given year if:(1) they were ever resident in New Zealand (NZ),(2) lived in NZ for at least 6 months during the reference year, (3) were alive at the end of the reference year, (4) either appeared in any hospital (including emergency) admissions, community pharmaceutical dispensing or general practitioner enrolment datasets during the reference year or (5) had a registered birth in NZ. We analysed 252 273 records over 4 years, from 1 July 2011 to 30 June 2015.ResultsWe found that participation rates varied for each component of the B4 School Check (in 2014/2015 91.8% for vision and hearing tests (VHTs), 87.2% for nurse checks (including height, weight, oral health, Strengths and Difficulties Questionnaire [SDQ] and parental evaluation of development status) and 62.1% for SDQ – Teacher [SDQ-T]), but participation rates for all components increased over time. Māori and Pacific children were less likely to complete the checks than non-Māori and non-Pacific children (for VHTs: Māori: OR=0.60[95% CI 0.61 to 0.58], Pacific: OR=0.58[95% CI 0.60 to 0.56], for nurse checks: Māori: OR=0.63[95% CI 0.64 to 0.61], Pacific: OR=0.67[95% CI 0.69 to0.65] and for SDQ-T: Māori: OR=0.76[95% CI 0.78 to 0.75], Pacific: OR=0.37[95% CI 0.38 to 0.36]). Children from socioeconomically deprived areas, with younger mothers, from rented homes, residing in larger households, with worse health status and with higher rates of residential mobility were less likely to participate in the B4 School Check than other children.ConclusionThe patterns of non-participation suggest a reinforcing of existing disparities, whereby the children most in need are not getting the services they potentially require. There needs to be an increased effort by public health organisations, community and whānau/family to ensure that all children are tested and screened.

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Zou, Ke Wu, Bing Bing Li, Zhu Bing Hu, and Chun Zhe Liu. "The Strength Check for the Cockpit of "Ferris Wheel" Amusement Machine with ANSYS." Materials Science Forum 770 (October 2013): 406–9. http://dx.doi.org/10.4028/www.scientific.net/msf.770.406.

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Traditional mechanical calculations are more often used in the strength check of the amusement facility nowadays. However, there exit some disadvantages in this way, such as the long cycle cost, the heavy workload, and particularly the inability in case of more intricately forced parts. This paper illustrates the idea of using finite element analysis (ANSYS) software to check the strength of Ferris Wheel amusement machine rotating cockpit, analyzes the loads and stresses of the cockpit frame under extreme work conditions, and comes to a reasonable conclusion. And the strength check of intricately forced workpiece of amusement machines are explored as well.

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Hu, Xiao Dong, Shi Fei Wang, Di Jiang, and Hai Yue Wang. "Fatigue Strength Check of Pressure Swing Adsorber Based on FEM." Applied Mechanics and Materials 853 (September 2016): 241–45. http://dx.doi.org/10.4028/www.scientific.net/amm.853.241.

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Adsorption hydrogen productions are used for Hydrogen purification with hydrogen selective adsorption on the surface of microporous adsorption material based on adsorption principle with the equipment of Pressure Swing Adsorber (PSA). PSA is easy to be caused fatigue failure with frequent pressurization and pressure-relief. The fatigue pressure vessels must be fatigue strength checked according to the standards of pressure vessel design beside the Conventional design standards to ensure the service life of equipment. FEM was used to analyze the structure of a PSA provided by a chemical company on the basis of ensuring the fatigue strength according to the JB4732-1995 (2005). The structures of upper and lower connected nozzle had been optimized to locate the maximum stress beside the corner and the connected position between the heads and the forged nozzles to reduce the nozzles weight and cost. Finally, the maximum stress of the determined structure located in the forging tube between the head and the outer wall with the maximum stress value as 169.07MPa according to the design pressure of 1.03MPa. The alternating stress force and intensity amplitude had been calculated with the working pressure range from -0.08MPa to 0.85MPa. The modified stress of the working pressure range was 78.9MPa with alternating cycle allowance being greater than 106 times, which was greater than the design cycles of 9.2 x 105 times.

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Xue, Ling, Gang Zhou, Ya Jun Zhang, Jian Zhuang, and Da Ming Wu. "Micro Injection Molding and Strength Check of Polymer Micro-Needle." Advanced Materials Research 690-693 (May 2013): 3136–40. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3136.

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A kind of medicinal polymer needle array used for skin drug delivery is proposed in this paper. The structure design, ANSYS analysis, MOLDFLOW simulation and experiment are given. The structure of the micro-needle is that the needles are distributed on a thin-walled substrate. To study the strength of the micro-needle array, ANSYS software is used to check the axial and radial stress strength. The bending strength is improved by optimizing the micro-needle geometric structure. At the same time, in view of the polymer micro-needle array forming process, MOLDFLOW simulation software is used to research the effect that melt flow direction. The results show that the needle of the polymer melts in the micro-needle the cavities flowing along the axial direction is strong. Experiments were conducted to analyze the forming of micro-needle for different polymer, and a higher accuracy polymer micro-needle array is gotten.

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Lei, Yu, Yan Long Jiang, Chun Ling Zhu, Hong Shi, and Yu Wang. "Strength Check and Optimization Design of Movable Mine Refuge Chamber." Applied Mechanics and Materials 66-68 (July 2011): 407–12. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.407.

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Movable mine refuge chamber is widely used in coal mines for protecting miners from coalmine accident. During a coalmine accident, there will be large heat impact load and stress on the movable mine refuge chamber caused by high temperature and high pressure. Therefore the strength of the movable mine refuge chamber should be carefully designed to meet the safety requirement with the possible lightest weight. Based on analysis of the structure dimensions, material properties, and operating conditions, a finite element model is developed with an emphasis on the effect of the layout and sizes of stiffeners and structural form of the chamber. A comparison of different design schemes is made and the calculation result is given. This work could be helpful for optimization design of China’s movable mine refuge chamber.

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Fei-fei, GU, ZHU Zhi-song, YAN Xiao-zhao, and ZHU Yi-min. "Design and Strength check of Large Blow Molding Machine Rack." Physics Procedia 22 (2011): 252–57. http://dx.doi.org/10.1016/j.phpro.2011.11.040.

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Hui, Zhang, Gao Deli, and Tang Haixiong. "Landing string design and strength check in ultra-deepwater condition." Journal of Natural Gas Science and Engineering 2, no. 4 (September 2010): 178–82. http://dx.doi.org/10.1016/j.jngse.2010.05.006.

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Yun, Young Mook, and Youjong Lee. "Strengths of Struts and Nodal Zones for Strut-and-Tie Model Design of Reinforced Concrete Corbels." Civil Engineering Journal 7, no. 8 (August 1, 2021): 1275–89. http://dx.doi.org/10.28991/cej-2021-03091725.

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The strut-and-tie model (STM) method is useful for the limit state design of reinforced concrete (RC) corbels. However, for the rational design of RC corbels, designers must accurately determine the strengths of concrete struts and nodal zones to check the strength conditions of a selected STM and the anchorage of reinforcing bars in nodal zones. In this study, the authors suggested a numerical process for determining the strengths of concrete struts and nodal zones in RC corbel STMs. The technique incorporates the state of two-dimensional (2-D) stresses at the strut and nodal zone locations, 2-D failure envelope of concrete, deviation angle between the strut orientation and compressive principal stress trajectory, and the effect of concrete confinement by reinforcing bars. The authors also proposed the strength equations of struts and nodal zones that apply to the typical determinate and indeterminate STMs of RC corbels. The authors considered the effects of the shear span-to-effective depth ratio, the horizontal-to-vertical load ratio, and the primary tensile and horizontal shear reinforcement ratios in developing the strength equations. The authors predicted the failure strengths of 391 RC corbels tested to examine the appropriateness of the proposed numerical process and strength equations. The predicted failure strength compares very well with experimental results, proving that the rational analysis and design of RC corbels are possible by using the present study's strut and nodal zone strengths. Doi: 10.28991/cej-2021-03091725 Full Text: PDF

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Liu, Zhi. "Mechanical Chuck Design and Slip Strength Analysis." E3S Web of Conferences 299 (2021): 01014. http://dx.doi.org/10.1051/e3sconf/202129901014.

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Chuck is one of the key parts of coal mine tunnel drill, its performance directly affects the performance of the machine. In view of the existing problems of the hydraulic chuck, the structure of the new hydraulic chuck is designed and its working principle is briefly described. The strength of slips is analyzed by finite element method. The calculation results show that the initial design of slips meets the requirements of tunnel drilling rigs.

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Mohamad, Habib M., N. S. Afizah Asman, A. K. Mirasa, I. Saad, N. Bolong, Steven C. C. K., and Siti Nooraiin M. R. "A Consistency Check of Concrete Compressive Strength using Pearson’s Correlation Coefficient." Civil Engineering Journal 7, no. 3 (March 1, 2021): 541–48. http://dx.doi.org/10.28991/cej-2021-03091672.

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The efficiency of the concrete ready mix service provider is undoubtedly and has become a widespread trend among contractors in which facilitates and eliminated a large budget surplus in maintenance, operating costs and is preferred as it reflects more efficient asset utilization. However, the quality assurance of concrete supplied is always raised associated with the inconsistencies of concrete compressive strength at the age of 28 days. The objective(s) of this study are to determine the correlations between the compressive strength of ready mix concrete, to evaluate the consistencies of the results and to identify the irregular sources that lead to the inconsistencies. Based on the compressive strength values obtained from the existing experimental data using different concrete mixes from the batching plant, a statistical analysis was conducted. A total of 90 concrete cubes specimens were attained from 15 concrete batches. A correlation analysis was conducted using the Pearson Correlation calculation to check the consistency of concrete compressive strength. The calculation showed the Pearson correlation coefficient of this study is +0.990. This indicated that there are significant linear relationship exists between the concrete compressive strength and the density of concrete batches which is positively high. In conclusion, the analysis reveals that the design of ready mix concrete compressive strength is in high consistencies and acceptable in practices for the proposed mix design to the contractor. Doi: 10.28991/cej-2021-03091672 Full Text: PDF

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Lai, Hui Fen, and Wu Zheng Xiao. "The Structural Design and Check up Strength on Underwater Propulsion Manipulator." Advanced Materials Research 538-541 (June 2012): 2937–40. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2937.

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This document explains and demonstrates how to design the structure and analysis its strength for the underwater propulsion manipulator. Through comparison, the structural design program of the manipulator is determined, With the solidworks software, its strength is checked up, and the forces are analyzed by the dynamic simulation solidworks.

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Zhang, Xiang Hong, Han Yang, Si Lian Sheng, and Zhan Sheng Gong. "Check on Structural Strength of Carbon Fiber Composite Field Kitchen Units." Advanced Materials Research 690-693 (May 2013): 1810–14. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1810.

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Field kitchen units is used to guarantee the diet in field operations for troops, a set of field kitchen units includes 3 boxes and 1 tent for kitchen work, cooking staple and non-staple food for 150 people in 1 hour. The weight of units has to be reduced so as to guarantee its application in Tibetan plateau of 5000m as it can be loaded on the vehicle by 2-soldier moving laterally or 3-soldier lifting. Mechanics analysis is carried out in this paper for the structural of latest applied carbon fiber composite units, in an effort to ensure the box can bear the impact generated in the course of transportation and loading, software LS-DYNA is applied to make finite-element analysis to simulate drop simulation test, checking if the strength of box structure reaches the designed requirements.

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Min, Lu Qun, Liao Hong, and Shu Lian. "Study on safe distance and strength check of natural gas flaring." IOP Conference Series: Earth and Environmental Science 267 (June 8, 2019): 062049. http://dx.doi.org/10.1088/1755-1315/267/6/062049.

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Li, Yunfeng, and Di Jiang. "Strength check of a three-row roller slewing bearing based on a mixed finite element model." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 18 (April 6, 2016): 3393–400. http://dx.doi.org/10.1177/0954406216644267.

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For the two failure modes of a three-row roller slewing bearing, ring fracture and raceway spalling, a method for checking the strength of a slewing bearing through finite element analysis is proposed. This method calculates the internal stress distribution of the bearing rings by using the mixed finite element model with both solid elements and spring elements of the slewing bearing assembly and checks the bearing structural strength by using the maximum internal stress of the bearing rings. The method also calculates the contact stress between the roller and raceways by using the entity contact model between the roller and the raceways; the obtained maximum contact stress is used to check the contact strength of the slewing bearing. The proposed mixed finite element model considers the structural deformation of the bearing rings, and the calculated results can reflect the real situation more accurately than the traditional analytical model with the hypothesis of rigid ring. The proposed method also avoids the solution problem, which has large-scale calculation and difficulty of convergence of the entity finite element model of a slewing bearing, and the calculation efficiency is improved effectively. The calculated results by mixed finite element model are consistent with the failure mode of this type of slewing bearing in engineering practice.

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Yao, Xiao Ning, Yu Long Zhou, and Xin Sheng Zhang. "Grillage Structural Optimization Based on Genetic Algorithm and Mechanical Direct Calculation." Advanced Materials Research 1061-1062 (December 2014): 1135–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.1135.

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In the process of using the genetic algorithm for grillage structural optimization, direct calculation was applied to grillage structural strength Check. The combination of genetic algorithm and direct calculation can save significant time in optimization design and strength check, at the same time, optimized grillage structure provides more security.And then this structure optimization scheme was programmed by VB with easy interface. The example indicates the program, being reasonable and feasible, proves the combination's superiority.

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Venturini, Tommaso, Liliana Bounegru, Jonathan Gray, and Richard Rogers. "A reality check(list) for digital methods." New Media & Society 20, no. 11 (April 20, 2018): 4195–217. http://dx.doi.org/10.1177/1461444818769236.

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Digital Methods can be defined as the repurposing of the inscriptions generated by digital media for the study of collective phenomena. The strength of these methods comes from their capacity to take advantage of the data and computational capacities of online platforms; their weakness comes from the difficulty to separate the phenomena that they investigate from the features of the media in which they manifest (‘the medium is the message’, according to McLuhan’s 1964 dictum). In this article, we discuss various methodological difficulties deriving from the lack of separation between medium and message and propose eight practical precautions to deal with it.

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Olamijuwon, Emmanuel Olawale. "Characterizing low effort responding among young African adults recruited via Facebook advertising." PLOS ONE 16, no. 5 (May 14, 2021): e0250303. http://dx.doi.org/10.1371/journal.pone.0250303.

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Multiple studies have successfully used Facebook’s advertising platform to recruit study participants. However, very limited methodological discussion exists regarding the magnitude of low effort responses from participants recruited via Facebook and African samples. This study describes a quasi-random study that identified and enrolled young adults in Kenya, Nigeria, and South Africa between 22 May and 6 June 2020, based on an advertisement budget of 9,000.00 ZAR (US $521.44). The advertisements attracted over 900,000 views, 11,711‬ unique clicks, 1190 survey responses, and a total of 978 completed responses from young adults in the three countries during the period. Competition rates on key demographic characteristics ranged from 82% among those who attempted the survey to about 94% among eligible participants. The average cost of the advertisements was 7.56 ZAR (US $0.43) per survey participant, 8.68 ZAR (US $0.50) per eligible response, and 9.20 ZAR (US $0.53) per complete response. The passage rate on the attention checks varied from about 50% on the first question to as high as 76% on the third attention check question. About 59% of the sample passed all the attention checks, while 30% passed none of the attention checks. Results from a truncated Poisson regression model suggest that passage of attention checks was significantly associated with demographically relevant characteristics such as age and sex. Overall, the findings contribute to the growing body of literature describing the strengths and limitations of online sample frames, especially in developing countries.

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Chui, Y. H., and Steven Craft. "Fastener head pull-through resistance of plywood and oriented strand board." Canadian Journal of Civil Engineering 29, no. 3 (June 1, 2002): 384–88. http://dx.doi.org/10.1139/l02-019.

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A nailed or screwed sheathing-to-timber joint may fail in one of two possible modes when subjected to a load applied along the axis of the fastener: fastener head pull-through of the sheathing material and shank withdrawal from the timber. Currently, the Canadian timber design code does not provide specifications to check the first mode of failure. In this study, tests were conducted to determine the head pull-through strengths of some common hammer and power-driven nails and wood screws in plywood and in oriented strand board. These are compared with the calculated shank withdrawal strengths of the same fasteners from timber, assuming it to belong to the Douglas firlarch species group. The test results show that there is no significant difference in strengths between plywood and oriented strand board. Head pull-through strength appears to increase with fastener diameter. The major conclusion reached is that, except for small size nails (less than 2 in. long), fastener head pull-through in sheathing prevails over shank withdrawal from timber in sheathing-to-timber joints when loaded axially.Key words: nail, wood screw, head pull-through, withdrawal strength, timber, design capacities.

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Hu, Jong Wan, and Hee Myung Jang. "Design Check for the Steel Gusset Plate in Tension Using LRFD Method." Applied Mechanics and Materials 432 (September 2013): 210–14. http://dx.doi.org/10.4028/www.scientific.net/amm.432.210.

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This study is mainly intended to examine gusset plate described on the basis of the load resistance factored design (LRFD) method. The determination of design based on the full plastic strength of gusset plate in accordance with the current AASHTO Specifications. The I-40 bridge gusset plates considered herein were designed in accordance with the previous allowable stress design (ASD) method. Therefore, new design methodology will be applied to this gusset plate bridge in this study suggested by new LRFD method. The design strength models to evaluate resistance strength against available failure modes such as tension yielding and block shear rupture are presented. In addition, detailed equations are described with step-by-step procedures. Finally, the rating factor between resistance strength and applied loading, which indicates life safety, will be presented according to available failure modes.

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John, Wasiu, Agbawhe Okeoghene Oghenekume, and Tuleun Lawrence Zahemen. "The Effect of Calcium Carbonate Filler on Self-Compacting Concrete Using Different Aggregate Sizes." European Journal of Engineering Research and Science 4, no. 9 (September 5, 2019): 9–16. http://dx.doi.org/10.24018/ejers.2019.4.9.1485.

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In this research work, the effect of Calcium Carbonate Filler was studied on the compressive strength and the workability of self-compacting Concrete (SCC) at different grades (M60, M65 and M70) and different coarse aggregate sizes (6.3mm, 10mm and 20mm). Calcium Carbonate Filler (Limestone powder) and Rice Husk Ash (RHA) were added in percentages of 2.5% and 5% to check its effect on the workability and strength properties of SCC and Normally Vibrated Concrete. Experimental investigations were carried out on SCC and normally vibrated concrete (NVC) samples of grade M60, M65 and M70 using different aggregate sizes of 6.3mm, 10mm and 20mm. The workability test results obtained showed values within specification. The compressive and Tensile strengths for SCC (with powder and 2.5% RHA) are higher than that with powder and 5% RHA and NVC. Generally, the use of Calcium Carbonate Filler improved the strength and densities for SCC design mix and decreased its workability. It is concluded that the use of SCC with designed Fillers ratio and RHA (≤5%) will improve the strength properties of SCC.

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Goyal, Arun, Rinku Sharma, Indu Khatri, A. K. Singh, Shougaijm Somorendro Singh, and Man Mohan. "Collision strength and effective collision strength for Br XXVII." Canadian Journal of Physics 95, no. 11 (November 2017): 1127–35. http://dx.doi.org/10.1139/cjp-2017-0032.

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Collision strengths for all 1326 transitions among lowest 52 fine-structure levels of Br XXVII have been computed using Dirac atomic R-matrix code (DARC). Resonances in the threshold region have been completely resolved and the contributions of these resonances to allowed and forbidden transitions have been presented. The partial collision strength for each angular momentum has been studied graphically. Effective collision strengths have also been determined within the temperature range for all 1326 transitions among the lowest 52 levels. Target state energies of the lowest 52 fine-structure levels have been computed from the multi-configuration Dirac–Fock method (MCDF). Additionally, similar calculations with the relativistic distorted wave method and flexible atomic code (FAC) have also been performed to check the accuracy of our results. The present work represents a new and significant work with improvement in the field. We believe that our presented data of collision and effective collision strengths may be useful in the future for benchmark calculations and for plasma diagnostics.

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Ren, Xiao Song, and Yu Fei Tao. "Discussion on the Seismic Design Analysis Method of Masonry Building." Advanced Materials Research 163-167 (December 2010): 3952–57. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3952.

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The main seismic objective in China is defined as “no failure under minor earthquake, repairable damage under moderate earthquake and no collapse under major earthquake”. Both strength and deformation are important to evaluate the seismic performance. For masonry building, only the shear strength check under minor earthquake is stipulated in the current Chinese seismic design code. Due to the poor ductility of masonry building, the seismic design analysis method may not guarantee the collapse-resistant capacity under major earthquake. For the achievement of the seismic objective, the demand of ductility is discussed. A typical severely damaged masonry building by the 5.12 Wenchuan Earthquake of 2008 is presented for the analysis of the through X-shape crack on the load-bearing wall. In order to enhance the collapse-resistant capacity, the authors suggest more shear strength margin to take the influence of structural ductility into consideration. The feasible way can be easily realized as a target to raise the limitation for the shear strength check parameter under minor earthquake and to keep uniform seismic capacity in two directions. The investigated building is also illustrated here as an example to process the shear strength check for better seismic performance by the authors’ suggestion.

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Wu, Zhi Yun, and Chun Fang Zhang. "The Application of Multiaxial Fabric Blower Blade and its Strength Theory Check." Advanced Materials Research 476-478 (February 2012): 2586–89. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.2586.

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The scale application of wind energy conforms to the demand of sustainable development in our country. However, with the blower’s blade lengthened, the weight will also increase. If it is made in traditional way, it would reach tons of orders of magnitude, and the centrifugal force on the blade root will become very large because of the tip speed ratio. When the wind is large enough, the blade force model is equivalent to a cantilever beam structure, thus the material of extended wind turbine blade should possess high strength and high modulus and should be light. Otherwise the blade’s life will be shortened [1]. In many of the materials, the multi-axial fabric is a good carrier to meet these requirements. If the blade in the extended length also can meet the strength requirements, the multi-axial fabric will be the top choice for future wind-driven generator blade design and manufacture.

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Gerschutz, Maria J., Michael L. Haynes, Derek Nixon, and James M. Colvin. "Strength evaluation of prosthetic check sockets, copolymer sockets, and definitive laminated sockets." Journal of Rehabilitation Research and Development 49, no. 3 (2012): 405. http://dx.doi.org/10.1682/jrrd.2011.05.0091.

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Han, R. P. S., and A. C. J. Luo. "Resonant Layers in Nonlinear Dynamics." Journal of Applied Mechanics 65, no. 3 (September 1, 1998): 727–36. http://dx.doi.org/10.1115/1.2789117.

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A new method based on an incremental energy approach and the standard mapping technique is proposed for the study of resonant layers in nonlinear dynamics. To demonstrate the procedure, the method is applied to four types of Duffing oscillators. The appearance, disappearance and accumulated disappearance strengths of the resonant layers for each type of oscillator are derived. A quantitative check of the appearance strength is performed by computing its value using three independent methods: Chirikov overlap criterion, renormalization group technique, and numerical simulations. It is also observed that for the case of the twin-well Duffing oscillator, its perturbed left and right wells are asymmetric.

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Adluri, Seshu M. R., and Murty K. S. Madugula. "Torsional – flexural buckling strength of steel angles." Canadian Journal of Civil Engineering 23, no. 1 (February 1, 1996): 260–71. http://dx.doi.org/10.1139/l96-027.

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Although structural steel angles have a wide variety of applications, they have not received attention comparable to that given to heavy shapes such as wide-flange sections. Because steel angles are singly symmetric or asymmetric, torsional-flexural buckling is an important mode of failure. The Canadian steel design practice for hot-rolled steel members (as given by CAN/CSA-S16.1-94) does not give a detailed procedure applicable to all sizes of steel angles. Some of the world codes applicable for steel angles specify torsional–flexural buckling check and plate buckling check to be considered simultaneously wherever applicable. The paper presents the results of an experimental investigation consisting of 34 hot-rolled steel angles under concentric compression (slenderness ratios between 50 and 150) failing in torsional?flexural buckling. The width to thickness ratios of test specimens ranged from 13 to 20. The results give a continuous spread of compressive strengths for practical ranges of slenderness parameters. The results show that torsional–flexural buckling and plate buckling need not be considered simultaneously even for unequal angles if they are designed according to CAN/CSA-S16.1-94. Key words: angle, buckling, codes and standards, compression, design strength, flexural buckling, local buckling, specifications, steel, torsional–flexural buckling.

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Brone, Ronald, and Marvin Reznikoff. "Strength Gains, Locus of Control, and Self-Description of College Football Players." Perceptual and Motor Skills 69, no. 2 (October 1989): 483–93. http://dx.doi.org/10.2466/pms.1989.69.2.483.

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The present study investigated strength gains and change in self-concept and locus of control related to participation in a weight-training program. 37 college football players were administered Rotter's Internal-External Locus of Control Scale and Gough and Heilbrun's Adjective Check List prior to and immediately following their participation in a 14-wk. weight-training program. While participants who scored high on the Femininity scale and high on externality on the I-E scale achieved greater gains on some of the strength measures, for the most part I-E and Adjective Check List scores did not predict strength changes. A positive correlation was found between change in total strength and change in score on the Self-confidence scale. Regardless of change in strength, subjects showed an increase in scores on the Order scale from pretest to posttest. The need for further research on the relationships between participation in a weight-training program, gains in strength and self-concept is discussed.

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Burton, Gordon R., Wing Fat Chan, Glyn Cooper, C. E. Brion, Ashok Kumar, and William J. Meath. "The dipole oscillator strength distribution and predicted dipole properties for ammonia." Canadian Journal of Chemistry 71, no. 3 (March 1, 1993): 341–51. http://dx.doi.org/10.1139/v93-051.

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Newly available and highly accurate oscillator strength data, extending over the continuous energy range from the first excitation threshold to 200 eV, are used together with mixture rule estimates and other photoabsorption data to construct a refined dipole oscillator strength distribution to infinite photon energy using Thomas–Reiche–Kuhn sum rule and molar refractivity constraints. This constrained dipole oscillator strength distribution has been used to calculate a wide range of related dipole properties (Sk, k = 2, 1, 0, −1/2, −1, −3/2, −2, −5/2, −3, −4, −5, −6, −8, −10, −12; Lk and Ik, k = 2, 1, 0, −1, −2). The theoretical analysis and associated consistency checks support the high accuracy of the newly available absolute oscillator strengths for the photoabsorption of NH3.

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Ubi, Stanley Emmanuel. "EFFECT OF REPLACING SHARP SAND WITH STONE DUST AS FINE AGGREGATE IN CONCRETE." International Journal of Engineering Science Technologies 5, no. 2 (April 19, 2021): 105–23. http://dx.doi.org/10.29121/ijoest.v5.i2.2021.176.

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Concrete is very variable material, having a wide range of strengths and stress-strain curve. Concrete composite material whose basic properties are related to the characteristic of constituent element, especially the aggregate. This research aimed to investigate the effect of replacing sharp sand with stone dust as an alternative to only river sand. Sieve analysis was carried out on the aggregate to determine the size of particle distribution. Slump test was carried out to compare the batches of concrete for the grade, water content between batches of concrete and amount of aggregate. Compressive strength test was carried out on concrete cubes made from sharp sand and concrete cubes made from replacement of sharp sand with stone dust also concrete made from ordinary stone dust at constant of free water/cement ratio 0.5. To check the properties of concrete produced with different materials, the tests were done for 7, 14, 21 and 28 days. The result obtained indicated that the strength of using sharp sand with stone dust in concrete production was higher than the strength of stone dust in concrete also higher than the strength of using sharp sand in concrete.

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Yin, Zhong Jun, Ling Jin, Bing Chen, Lian Wan Zhang, and Zhi Chao Tang. "Stress Testing and Strength Analysis of Vibrating Cooler." Advanced Materials Research 145 (October 2010): 516–21. http://dx.doi.org/10.4028/www.scientific.net/amr.145.516.

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For large vibrating cooler, which is belong to the rotary hearth furnace production line. It will produce a strong vibration at work, and it must satisfy a certain strength requirements. The service life of itself and whole production line are determined by the strength and overall stress level of the equipment. So, it is necessary to test and analyze the stress of vibrating cooler, and check its strength effectively.

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Molazadeh, Meisam, and Ali Taghikhani. "Form Conditions of Check Issuing in Iranian and British Law." Journal of Politics and Law 9, no. 8 (September 29, 2016): 80. http://dx.doi.org/10.5539/jpl.v9n8p80.

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The aim of this research is to evaluate the components and to state the form conditions of check issuing in statute of two countries of Iran and England. Due to the wide use of check and prevalence of its use as a payment instrument, and even the instrument for obtaining reputation such as promissory note and draft, the issuer should be familiar with the form conditions of check issuing to prevent possible problems caused by lack of knowledge. Since today these documents play a major role in communicating and business transactions, and strength most of deals. This led to prevalence of using aforementioned documents in establishment of trade exchanges, so that it can be said that these documents are an inseparable part of business transactions. The results obtained from the other researches and studies indicate that form conditions of check issuing are almost identical in Iranian and British Laws, that observing some of them is necessary, and if they are not observed, commercial document of the check will not have the necessary validity. Of mandatory form conditions include the date of issuing check include: Check issuing date, mentioning the word of check, unconditional order of payment of the amount check, check amount, mentioning the name of drawee on the check, mentioning the name of Mohil, indicating the place of check issuing, indicating the name of the holder, signature of check . In this study form conditions of issuing electronic check have also been investigated.

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Febryawan, Wisnu Sadewa, Januar Fery Irawan, and Luthfi Amri Wicaksono. "BACK ANALYSIS OF THE RETAINING WALL AT JEMBER - BANYUWANGI ROAD KM 234+500." Jurnal Rekayasa Sipil dan Lingkungan 3, no. 1 (June 3, 2019): 71. http://dx.doi.org/10.19184/jrsl.v3i1.9633.

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The retaining wall at Jember-Banyuwangi Road KM 234+500 consists of primer structure and secondary structure. The structure has a crack failure that the length is 2,5 m vertically. The back analysis is needed retaining wall stability and strength reduction stability. Methods used in stability calculations by Das method which calculate based on a failure of overturning, sliding, and bearing capacity, meanwhile strength reduction stability used by Plaxis program. The result stability calculations review Cross Section 1, 7, and 14 to check for overturning are 1,07 ; 1,29 ; 1,31 respectively, check for sliding are 0,87 ; 1,10 ; 1,16 respectively, check for bearing capacity failure are 6,64 ; 5,93 ; 6,83, check for strength reduction are 0,98 ; 0,99 ; 1,15 respectively. Dinding penahan tanah (DPT) di Jalan Raya Jember-Banyuwang KM 234+500 terdiri dari struktur utama dan struktur sekunder. Dinding penahan tanah tersebut mengalami kerusakan (crack) pada bagian atas struktur dengan panjang crack sepanjang 2,5 m secara vertikal. Diperlukan analisis balik stabilitas dinding penahan tanah dan pengurangan kekuatan untuk mengetahui penyebab kerusakan struktur DPT. Metode yang digunakan dalam perhitungan stabilitas tanah dengan metode Das yang meninjau cek terhadap guling, geser, dan kegagalan daya dukung, sedangkan stabilitas pengurangan kekuatan dengan program Plaxis. Hasil perhitungan stabilitas meninjau bagian struktur utama Cross Section 1, 7, 14 untuk cek terhadap guling masing-masing 1,07 ; 1,29 ; 1,31, cek terhadap geser masing-masing 0,87 ; 1,10 ; 1,16, cek terhadap kegagalan daya dukung masing-masing 6,64 ; 5,93 ; 6,83, cek terhadap pengurangan kekuatan 0,98 ; 0,99 ; 1,15.

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Malshikare, Ajay, Akhil Samson, Akansha Singh, and Tushar J. Palekar. "To Check 10% Rule of Dominance in Hand Grip Strength of Physiotherapy Students." Indian Journal of Physiotherapy and Occupational Therapy - An International Journal 13, no. 2 (2019): 6. http://dx.doi.org/10.5958/0973-5674.2019.00036.4.

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Yuan-jia, Song, Lai Huan, Chen Wan-hua, Zhang Wei, and Hou Yu. "Selection and strength check on fasteners of protective structure in cryogenic wind tunnel." Journal of Physics: Conference Series 1605 (August 2020): 012059. http://dx.doi.org/10.1088/1742-6596/1605/1/012059.

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Journal articles on the topic 'Strenght check'

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