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Journal articles on the topic 'Strengths'

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Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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1

Choi, Sung-Oong. "Estimation of Rock Strengths Using Block Punch Strength Index Test." Journal of the Korean Society of Mineral and Energy Resources Engineers 50, no. 1 (2013): 88. http://dx.doi.org/10.12972/ksmer.2013.50.1.088.

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2

Shao, Xiao Rong. "Experiments for Strength Properties of Polypropylene Fiber-Reinforced Concrete." Advanced Materials Research 194-196 (February 2011): 1030–34. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1030.

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This paper made experimental research on the compressive strength, axis compressive strength and splitting tension strength of polypropylene fiber-reinforced concretes at a fiber content of 0.9Kg/m3 in different ages which showed that: in the experiment of compressive strength, the strengths of C20 polypropylene fiber concretes in the ages was lower; the strength of C30 polypropylene fiber concretes in the age of 7 days was lower, the strengths in the ages of 14 days and 28 days were basically equal to; the strength of C40 polypropylene fiber concretes in the age of 7 days was basically equal to and in 28 days was higher than the strengths of ordinary concretes. In the experiment of axis compressive strength, the strengths of C20 polypropylene fiber concretes in the ages were lower; the strengths of C30 polypropylene fiber concretes in the age of 7 days and 14 days were lower and in the age of 28 days was basically equal to; the strengths of C40 polypropylene fiber concretes in the ages were basically equal to the strengths of ordinary concretes. In the experiment of splitting tension strength, the strengths of C20 and C30 polypropylene fiber concretes were lower; the strength of C40 polypropylene fiber concretes in the age of 28 days was basically equal to the strengths of ordinary concretes. Conclusion: the relationships between the strength of fiber concretes and ordinary concretes are correlated to the strength grades of concretes, namely, When the strength degrade of concretes is low, the strength of polypropylene fiber concretes is lower, but the strength reaches closer to or exceeds the strength of ordinary concretes along with the increase of the strength grade of concretes.

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3

McQuaide, Sharon, and John H. Ehrenreich. "Assessing Client Strengths." Families in Society: The Journal of Contemporary Social Services 78, no. 2 (April 1997): 201–12. http://dx.doi.org/10.1606/1044-3894.759.

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Clients and clinicians alike need to be aware of clients' potential sources of strength, coping, and resilience. The authors make the concept of strengths more concrete and provide tools to assist in assessing strengths. Client characteristics that represent strengths are drawn from the research literature. The notion of strength in the context of clients' personal history, their immediate social environment the larger societal matrix, the mix of individual characteristics, the challenges clients face, and the meanings clients ascribe to their experiences and situation are discussed. A self-report instrument that can be used to enlist clients and their significant others in helping identify clients' strengths is provided, and cases of its use are presented.

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4

WATKINS, RAM, H. W. PANG, and D. P. MCNICHOLL. "A COMPARISON BETWEEN CUBE STRENGTHS AND IN SITU CONCRETE STRENGTH DEVELOPMENT.,UBE STRENGTHS AND IN SITU CONCRETE STRENGTH DEVELOPMENT." Proceedings of the Institution of Civil Engineers - Structures and Buildings 116, no. 2 (May 1996): 138–53. http://dx.doi.org/10.1680/istbu.1996.28282.

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5

Yamaguchi, Nobuyoshi. "In Situ Assessment Method of Wood Using Normalized Withdrawal Resistances of Metric-Screw Type Probes." Advanced Materials Research 778 (September 2013): 217–24. http://dx.doi.org/10.4028/www.scientific.net/amr.778.217.

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Withdrawal resistances of wood have been applied for in situ assessment of wood in existing timber structures. The author had proposed method to estimate shear strengths of wood from measured withdrawal resistances of probes which are screwed into wood. In order to verify the accuracy of these estimated shear strengths by proposed methods, withdrawal resistance measurements and shear loading tests were conducted for wood. Single withdrawal resistance measurement was applied for wood specimens, and estimated shear strengths from withdrawal measurements were compared to the measured shear strengths by shear loading tests of wood. Correlation between the estimated shear strengths and measured shear strengths of specimens was reasonably good (R2=0.73). Multiple coaxial withdrawal resistance measurement which can provide distribution of shear strengths in cross-section of wood was also proposed. The average of estimated shear strengths by single withdrawal resistances was 7 percent less than that of measured shear strengths. The average of estimated shear strength by multiple coaxial withdrawal resistances was 3 percent greater than that of measured shear strengths. The single withdrawal measurements and multiple coaxial withdrawal resistances are available to estimate shear strengths of wood and shear strength distribution in the cross-section of wood. Estimated shear strengths obtained from these methods will be valuable for strength based in situ assessment of wood.

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6

Kaiser, Robert B., and Darren V. Overfield. "Strengths, strengths overused, and lopsided leadership." Consulting Psychology Journal: Practice and Research 63, no. 2 (June 2011): 89–109. http://dx.doi.org/10.1037/a0024470.

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7

Menon, Krishna K., and Andris Freivalds. "Repeatability of Dynamic Strength Tests." Proceedings of the Human Factors Society Annual Meeting 29, no. 5 (October 1985): 517–20. http://dx.doi.org/10.1177/154193128502900525.

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The repeatability of dynamic strength tests was examined by calculating coefficients of variations (CV) for the forces exerted on lifting tests using the legs, torso and arms. Static strengths were also measured and compared to dynamic strengths. The CV for dynamic strengths, was in fact slightly lower than for static strengths, 9.79% vs. 10.6%. The correlations between the two types of strength measurements were large (r=.8l) and significant, indicating that along with good repeatability dynamic tests are an acceptable form of employee strength measurement.

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8

Carini, Patricia F. "Building from Children'S Strengths." Journal of Education 168, no. 3 (October 1986): 13–24. http://dx.doi.org/10.1177/002205748616800304.

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This essay discusses what the childhood perspective offers—and what we would lose were we deprived of it. In that context it discusses current threats to childhood and the effects of these threats on education; the strength and potential of our humanness, with special emphasis on children's own strengths as a basis for their education and the power of collective thought, cooperative action, and, above all, human warmth and affection for developing that strength and potential. The conclusion describes an education based on children's strengths as makers of meaning and knowledge, and ways teachers can learn to recognize and respond to these strengths.

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9

Huang, Guoping, Hui Wang, and Feiting Shi. "Coupling Effect of Salt Freeze-Thaw Cycles and Carbonation on the Mechanical Performance of Quick Hardening Sulphoaluminate Cement-Based Reactive Powder Concrete with Basalt Fibers." Coatings 11, no. 9 (September 20, 2021): 1142. http://dx.doi.org/10.3390/coatings11091142.

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The effect of salt freeze-thaw cycles coupled with carbonation on the mechanical performance of quick hardening sulphoaluminate cement-based reactive powder concrete combined with basalt fibers was investigated. The ratios of basalt fibers in sulphoaluminate cement-based reactive powder concrete (SAC-RPC) were 1%, 2%, 3% and 4% by the volume of concrete. The mechanical strengths (compressive strength, flexural strength and bonding strength) of SAC-RPC were investigated after curing for 5 h, 1 d, 14 d and 28 d, respectively. Meanwhile, the mechanical strengths of resultant concrete were detected, when different NaCl freeze-thaw cycles and carbonation were adopted. Results showed that the addition of basalt fibers could effectively improve the mechanical strengths, especially the flexural strength of SAC-RPC. The dosage of 3.0% was the threshold value affected mechanical strengths. The flexural, compressive and bonding strengths of SAC-RPC were higher than 8.53 MPa, 34 MPa and 3.21 MPa, respectively. The mass loss and mechanical strengths loss of SAC-RPC increased in the form of quadratic function with the increasing number of NaCl freeze-thaw cycles and varied in the form of quadratic decreasing function. Meanwhile, the effect of carbonation on the mechanical strengths of SAC-RPC can be ignored. Additionally, the coupling effect of salt freeze-thaw cycles and carbonation could accelerate the attenuation of concrete strength. The mechanical strengths loss demonstrated a decreased quadratic function with the increasing volume of basalt fibers.

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10

Duan, Wenjie, Jinxia Li, and Wenlong Mu. "Psychometric Characteristics of Strengths Knowledge Scale and Strengths Use Scale Among Adolescents." Journal of Psychoeducational Assessment 36, no. 7 (May 5, 2017): 756–60. http://dx.doi.org/10.1177/0734282917705593.

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This study examined the psychometric properties of Strengths Knowledge Scale (SKS) and Strengths Use Scale (SUS) in a sample of 442 adolescents by the exploratory structural equation modeling. Correlations between strength use/strength knowledge and flourish, positive affect, negative affect, depression, anxiety, stress, and GPA were examined to illustrate criterion-related validities. Results showed good internal consistency reliability, expected structure factor, and convergent validity of the SKS and the SUS in the current sample.

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11

Selverian, J. H., D. A. O’Neil, and S. Kang. "Performance Testing and Strength Prediction of Ceramic-to-Metal Joints." Journal of Engineering for Gas Turbines and Power 116, no. 3 (July 1, 1994): 622–28. http://dx.doi.org/10.1115/1.2906865.

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Brazed joints were made between silicon nitride and Ni-based and Fe-based super alloys. Room temperature shear (torsion) strengths ranged from 75-242 MPa for Si3N4-to-Incoloy 909 joints and from 30-127 MPa for the Si3N4-to-Inconel 718 joints. At 500°C the joint strength was 120 MPa while at 650°C and 950°C the joint strengths were less than 20 MPa. These low strengths at 650°C and 950°C were attributed to a reduction in the shrink-fit and to low braze strength at these high temperatures. Finite element analysis (FEA) and a probabilistic failure theory (CARES) were used to predict the joint strengths. The predicted joint strengths agreed well with measured joint strengths in torsional loading at 20°C. Torsion tests were also performed at 650°C. Aspects of the material systems, residual stresses, mechanical behavior, and strength predictions and presented. Two new braze alloys based on the Au-Ni-Cr-Fe system were used to overcome the poor high-temperature strength. Joints made with these brazes had good strength (85 MPa and 35 N-m) at 650°C.

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12

Hong, Xinghua, Hui Wang, and Feiting Shi. "Influence of NaCl Freeze Thaw Cycles and Cyclic Loading on the Mechanical Performance and Permeability of Sulphoaluminate Cement Reactive Powder Concrete." Coatings 10, no. 12 (December 16, 2020): 1227. http://dx.doi.org/10.3390/coatings10121227.

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This paper aimed to investigate the coupling effects of NaCl freeze–thaw cycles and cyclic loading on the mechanical performance and permeability of sulphoaluminate cement reactive powder concrete (RPC). Firstly, the compressive and flexural strengths of sulphoaluminate cement RPC were investigated. Then, the chloride ion permeability, mechanical strengths (compressive and flexural strengths) and mass loss were determined. Results indicated that the increased steel fibers content and curing age played positive roles in the mechanical strengths. The threshold values of steel fibers and curing age were 3.0% and 14 days. Sulphoaluminate cement RPC with early curing age (5 h) showed relatively high mechanical strengths: flexural strength (8.69~17.51 MPa), and compressive strength (34.1~38.5 MPa). The mass loss, the chloride migration coefficient, and the compressive strength loss increased linearly with NaCl freeze–thaw cycles. Meanwhile, the flexural strength loss increased with the exponential function. The relative dynamic modulus of elasticity of specimens decreased linearly with the increased freeze–thaw cycles. Finally, it was observed from this paper, cyclic loading demonstrated negative roles on the mechanical strengths and resistance to chloride penetration.

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13

Bozic, Nick. "Developing a strength-based approach to educational psychology practice: A multiple case study." Educational and Child Psychology 30, no. 4 (December 2013): 18–29. http://dx.doi.org/10.53841/bpsecp.2013.30.4.18.

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Frameworks for practice in professional educational psychology have often taken a problem solving orientation, paying more limited attention to strengths. In contrast, the strength-based movement has challenged professionals to place the discovery and use of clients’ strengths at the heart of their practice. This explorative multiple case study investigates how strength-based assessments can be integrated into school-based educational psychology work, to identify actual and potential strengths at personal, interpersonal and systems levels. The approach was adopted in six cases. In each of these the focus child/young person was interviewed using either the Child and Adolescent Strengths Assessment (Lyons et al., 2000) or Assets Interview (Morrison et al., 2006). Information gained from the assessment was then used to inform an intervention plan. The following research questions were asked: (1) To what extent could a strength-based approach to practice generate information about areas of strength at different levels of ecology? (2) In what way would strengths be utilised within subsequent action plans/interventions? (3) Were action plans associated with measurable change? Findings indicated that strengths could be identified at a range of ecological levels. Strengths influenced action plans by affecting the choice of strategy and/or target of interventions. There was evidence of positive change in a high proportion of cases.

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14

Yeon, Kyu-Seok, Kwan Kyu Kim, Jaeheum Yeon, and Hee Jun Lee. "Compressive and Flexural Strengths of EVA-Modified Mortars for 3D Additive Construction." Materials 12, no. 16 (August 15, 2019): 2600. http://dx.doi.org/10.3390/ma12162600.

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The compressive and flexural strengths of mortars modified with ethylene-vinyl acetate (EVA) were experimentally investigated for use in three-dimensional (3D) additive construction (3DAC). EVA powder, which is available in a premix type, was employed as an admixture. The test results for the cast specimens showed that, at a curing age of 28 days, the compressive strengths ranged from 32.92 MPa to 43.50 MPa, and the flexural strengths ranged from 12.73 MPa to 14.49 MPa. The compressive and flexural strengths of the printed specimens were relatively lower: 23% to 26% and 3% to 7%, respectively. The compressive strength also decreased and the flexural strength increased when the EVA/cement ratio was increased. The results of the experiment reveal that the EVA-modified mortar had a high rate of strength development early on, making the material advantageous for use in 3DAC. It was determined that the appropriate EVA/cement ratio ranged between 5% and 15%. However, the printed specimens exhibited lower compressive and flexural strengths than did the cast specimens, and the compressive strength decreased as the EVA content was increased. This study provides the compressive and flexural strengths of common EVA-modified mortars, important data for 3DAC applications.

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15

Lee, Swoo-Heon, Kyung-Jae Shin, So-Yeong Kim, and Hee-Du Lee. "Numerical Study on the Deformation Behavior of Longitudinal Plate-to-High-Strength Circular Hollow-Section X-Joints under Axial Load." Applied Sciences 9, no. 19 (September 24, 2019): 3999. http://dx.doi.org/10.3390/app9193999.

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This study aims to investigate the joint strength of longitudinal plate-to-high-strength steel circular hollow-section X-type joints under plate axial load. The material properties of high-strength steel with nominal yield strengths of 460, 650, 900, and 1100 MPa were used for parametric analysis. The variables for analysis were ratios of chord diameter to thickness, plate width to chord diameter, and utilization. To determine the capacity of connections, the joint strengths using a deformation limit and a strength limit were considered and compared with American Institute of Steel Construction (AISC), Eurocode 3, and ISO 14346. The joint strength determined by the ultimate deformation limit is approximately equal to the joint strength determined by the strength limit state at the yield strength of 460 MPa. The difference between both the joint strengths, however, becomes higher with increasing yield strength. The design equations estimate the joint strength based on the ultimate deformation limit approximately until the limitation of the nominal yield strength in each design code. As the nominal yield strength increases, the joint strengths are overestimated. In using high-strength steel in circular hollow-section X-type joints, the reduction factors of 0.75 and 0.62 for AISC and ISO 14346 are suggested for the nominal yield strengths of 900 and 1100 MPa, respectively. In Eurocode 3, the reduction factor of 0.67 is also suggested for a yield strength of 1100 MPa.

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16

Herbudiman, Bernardinus, Erma Desmaliana, and Andhi Muhammad Irawan. "Mechanical properties of concrete with substitution of coated styrofoam balls on coarse aggregate." MATEC Web of Conferences 276 (2019): 01028. http://dx.doi.org/10.1051/matecconf/201927601028.

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Substitution of Styrofoam balls on coarse aggregates reduced concrete self-weight. Coating on Styrofoam ball surface makes ball has shell on its surface and could increase the adhesive strength between ball surfaces and cement paste. The coating materials made by mixing of Portland cement and RCC-15 (Residual Catalytic Cracker-15) as pozzolanic material. 20 mm diameter Styrofoam balls are used. Coarse aggregates substituted by 5%, 15%, and 20% Styrofoam balls. The test specimens used three 10x20cm cylinders for each variant. Beam specimens of 15x15x60cm used for bending strength test by third point loading method. The testing of mechanical properties were 7, 14, and 28 days compressive strengths, 28 days split-tensile strengths and 28 days flexural strengths. The experimental results of concrete with various Styrofoam ball substitutions of 5%, 15%, and 20% at 28 days show the average compressive strengths are 27.6 MPa, 24.3 MPa, and 20.3 MPa, the splittensile strengths are 2.5 MPa, 2.2 MPa, and 1.7 MPa, and the flexural strengths are 5 MPa, 4.5 MPa, and 3.8 MPa, respectively. The compression strength could be predicted by density ratio method and air content method. The experimental results show that all of the variants of Styrofoam ball coarse aggregates concrete are adequate to achieve structural strength, and have nearly compressive strengths compared with the prediction by density ratio method and air content method. Styrofoam balls substitution content could be increased to make the concrete density below 1,900 kg/m3 and compressive strength above 17.5 MPa to reach structural lightweight concrete performance.

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17

Das, Biman, and Yanqing Wang. "Isometric Pull-Push Strengths in Workspace: 1. Strength Profiles." International Journal of Occupational Safety and Ergonomics 10, no. 1 (January 2004): 43–58. http://dx.doi.org/10.1080/10803548.2004.11076594.

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18

Fisher, David, Marijn Franx, and Garth Illingworth. "Line Strengths and Line-Strength Gradients in S0 Galaxies." Astrophysical Journal 459 (March 1996): 110. http://dx.doi.org/10.1086/176873.

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19

Chomcherngpat, C., P. Mandhani, C. Lum, and C. Martin. "Human Lifting Strength in Different Postures." Proceedings of the Human Factors Society Annual Meeting 33, no. 11 (October 1989): 745–49. http://dx.doi.org/10.1177/154193128903301126.

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A laboratory study was conducted to determine static lifting strengths on 13 males and 12 females from 18 to 28 years of age. Using the strength monitor, the average strength and peak strength were measured in four different postures: standing, sitting, lying on stomach with elbows support, and without elbow support. Five sets of data were collected at constant heights. There was a significant difference in lifting strengths between standing lifts and lying on stomach without elbow-support postures; maximum lift occurred in the standing position. It was found that there was no significant difference in lifting strengths between sitting and lying on stomach with elbows sup port. The average female strengths were found to be about 49% to 55% of male subjects in all postures.

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20

Kaczmarek, Peggy. "Counseling Psychology and Strength-Based Counseling." Counseling Psychologist 34, no. 1 (January 2006): 90–95. http://dx.doi.org/10.1177/0011000005282371.

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The author provides a reaction to the proposed strength-based counseling model for at-risk youth. The Major Contribution initiates a dialogue about how to define strengths and how to operationalize a strength-based model of counseling. Discussing how this model adapts to adolescents by capitalizing on this developmental stage’s uniqueness would strengthen the model. In addition, research needs to test the model’s efficacy.

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21

Xia, Tian, Rui Wang, Zhongnan Bi, Rui Wang, Peng Zhang, Guangbao Sun, and Ji Zhang. "Microstructure and Mechanical Properties of Carbides Reinforced Nickel Matrix Alloy Prepared by Selective Laser Melting." Materials 14, no. 17 (August 24, 2021): 4792. http://dx.doi.org/10.3390/ma14174792.

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Selective laser melting was used to prepare the ceramic particles reinforced nickel alloy owing to its high designability, high working flexibility and high efficiency. In this paper, a carbides particles reinforced Haynes 230 alloy was prepared using SLM technology to further strengthen the alloy. Microstructures of the carbide particles reinforced Haynes 230 alloy were investigated using electron microscopy (SEM), electron probe microanalysis (EPMA) and transmission electron microscopy (TEM). Meanwhile, the tensile tests were carried out to determine the strengths of the composite. The results show that the microstructure of the composite consisted of uniformly distributed M23C6 and M6C type carbides and the strengths of the alloy were higher than the matrix alloy Haynes 230. The increased strengths of the carbide reinforced Haynes 230 alloy (room temperature yield strength 113 MPa increased, ~ 33.2%) can be attributed to the synergy strengthening including refined grain strengthening, Orowan strengthening and dislocation strengthening.

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22

Mohammed, Ahmed, and Wael Mahmood. "Statistical Variations and New Correlation Models to Predict the Mechanical Behavior and Ultimate Shear Strength of Gypsum Rock." Open Engineering 8, no. 1 (August 11, 2018): 213–26. http://dx.doi.org/10.1515/eng-2018-0026.

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Abstract In this study, over 1000 data from the several research studies was used to characterize and compare the density, strengths, modulus, flexural strength, porosity and the ultimate shear strengths of the calcium rocks. The gypsum rock data were statistically analyzed, quantified and compared with the limestone rock data. The ranges of the densities for gypsum rock (CaSO4·2H2O) and limestone rock (CaCO3) were 2.10 to 2.83 gm/cm3 and 1.70 to 2.75 gm/cm3, respectively. The compressive and tensile strengths of the gypsum and limestone rocks varied from 2 MPa to 250 MPa and 1.8 MPa to 25 MPa, respectively. Vipulanandan correlation model was effective in relating the modulus of elasticity, flexural strength, with the relevant strengths of the rocks. A new nonlinear Vipulanandan failure criterion was developed to better quantify the tensile strength, pure shear (cohesion) strength and predict the maximum shear strength limit with applied normal stress on the gypsum and limestone rocks. The prediction of the failure models for the two rock types was also compared to the Mohr-Coulomb failure model. The Vipulanandan failure model predicted the maximum shear strength limit was, as the Mohr-Coulomb failure model does not have a limit on the maximum shear strength. With the Vipulanandan failure model based on the available data, the maximum shear strengths predicted for the gypsum and limestone rocks were 64 MPa and 114 MPa, respectively.

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23

Niemi, Judith, and Jill Fredston. "Fragile Strengths." Women's Review of Books 19, no. 4 (January 2002): 14. http://dx.doi.org/10.2307/4023838.

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24

Davis, Paul. "Game Strengths." Journal of the Philosophy of Sport 33, no. 1 (May 2006): 50–66. http://dx.doi.org/10.1080/00948705.2006.9714690.

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25

Wedl, Kathleen. "Shared Strengths." American Journal of Nursing 94, no. 1 (January 1994): 11. http://dx.doi.org/10.2307/3464447.

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26

Witt, Catherine L. "Celebrating Strengths." Advances in Neonatal Care 9, no. 1 (February 2009): 1. http://dx.doi.org/10.1097/01.anc.0000346080.88206.45.

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27

Mount, George. "Signature Strengths." Journal of Police Crisis Negotiations 5, no. 1 (January 16, 2005): 83–84. http://dx.doi.org/10.1300/j173v05n01_11.

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28

Wedl, Kathleen. "SHARED STRENGTHS." AJN, American Journal of Nursing 94, no. 1 (January 1994): 11. http://dx.doi.org/10.1097/00000446-199401000-00006.

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29

Giblin, Paul. "Family Strengths." Family Journal 4, no. 4 (October 1996): 339–46. http://dx.doi.org/10.1177/1066480796044008.

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30

Nkosi, Busisiwe, and Priscilla Daniels. "Family Strengths." Marriage & Family Review 41, no. 1-2 (August 27, 2007): 11–26. http://dx.doi.org/10.1300/j002v41n01_02.

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31

Bhattacharya, Sanjoy. "Consolidating Strengths." Medical History 59, no. 1 (December 11, 2014): 1–2. http://dx.doi.org/10.1017/mdh.2014.75.

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32

Ho, Y. K., and R. J. W. Henry. "Oscillator strengths and collision strengths for neutral sulfur." Astrophysical Journal 290 (March 1985): 424. http://dx.doi.org/10.1086/162999.

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33

Fawcett, B. C., and H. E. Mason. "Collision strengths and oscillator strengths for Fe IX." Atomic Data and Nuclear Data Tables 47, no. 1 (January 1991): 17–31. http://dx.doi.org/10.1016/0092-640x(91)90017-x.

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34

Wilson, H. S. "Performance of ilmenite concrete at sustained elevated temperatures." Canadian Journal of Civil Engineering 15, no. 5 (October 1, 1988): 776–83. http://dx.doi.org/10.1139/l88-102.

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Two similar mixes were made with cement contents of about 350 kg/m3 and a water–cement ratio of 0.50. The concrete specimens, moist cured for 7 days, were cured in air for 28 and 120 days, respectively, prior to heating. The exposure temperatures were 75, 150, 300, and 450 °C. The periods of exposure at each temperature were 2, 30, and 120 days.The compressive strengths, before heating, of the specimens cured for 35 and 120 days were 41.0 and 46.2 MPa, respectively, and the flexural strengths were 4.9 and 5.8 MPa. Compared with those strengths, the strengths of the specimens heated for 30 days or more increased at 75 °C but decreased at higher temperatures. The losses increased with increase in temperature, reaching about 30% at 450 °C.The flexural strength of the concrete cured in air for 28 days was more adversely affected than was the compressive strength. The flexural and compressive strengths of the concrete cured in air for 120 days were affected to about the same degree. The longer curing period had little effect on the relative losses in compressive strength, but the longer curing period reduced the loss in flexural strength. In most applications, the loss in strength could be compensated by proportioning the mix to overdesign for strength. Key words: high-density concrete, ilmenite, aggregates, high temperature, mechanical properties, nondestructive tests.

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35

Ma, Yong Qiang. "Experimental Study on Workability and Strength of Green High Performance Concrete with High Volume Fly Ash." Advanced Materials Research 859 (December 2013): 52–55. http://dx.doi.org/10.4028/www.scientific.net/amr.859.52.

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A great deal of experiments have been carried out in this study to reveal the effect of the water-binder ratio and fly ash content on the workability and strengths of GHPC (green high performance concrete). The workability of GHPC was evaluated by slump and slump flow. The strengths include compressive strength and splitting tensile strength. The results indicate that the increase of water-binder ratio can improve the workability of GHPC, however the strengths of GHPC were decreased with the increase of water-binder ratio. When the fly ash content is lower than 40%, the increase in fly ash content has positive effect on workability of GHPC, while the workability begins to decrease after the fly ash content is more than 40%. The addition of fly ash in GHPC has adverse effect on the strengths, and there is a tendency of decrease in the compressive strength and splitting tensile strength of GHPC with the increase of fly ash content.

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36

Akçaözoğlu, Semiha. "The effect of elevated temperature on the lightweight concrete containing waste PET aggregate." International Journal of Business & Technology 6, no. 3 (May 1, 2018): 1–14. http://dx.doi.org/10.33107/ijbte.2018.6.3.20.

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In this study, the effect of waste PET as lightweight aggregate (WPLA) replacement with conventional aggregate on the some physical and mechanical properties and residual compressive strength of concrete was investigated. For this purpose, five different mixtures were prepared (the reference mixture and four WPLA mixtures including 30%, 40%, 50% and 60% waste PET aggregate by volume). The fresh and dry unit weights, compressive strengths, flexural-tensile strengths, water absorption and porosity ratios of the mixtures were measured. In addition the specimens exposed to elevated temperatures at 150, 300 and 450 °C and the residual compressive strengths were measured. Test results indicated that the unit weight, compressive strength and flexural-tensile strength of the specimens decreased as the amount of WPLA increased in concrete. After exposing to elevated temperature, WPLA mixtures retained their structural integrity and compressive strengths at 150 °C and 300 °C. However there was a significant decrease in the residual compressive strength values of WPLA mixtures at 450 °C.

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Kakar, Akshay, Elammaran Jayamani, Muhammad Khusairy bin Bakri, and Soon Kok Heng. "Heat Treated Luffa - PLA Composites: Effect of Cyclic Moisture Absorption and Desorption on the Mechanical Properties." Materials Science Forum 917 (March 2018): 42–46. http://dx.doi.org/10.4028/www.scientific.net/msf.917.42.

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The goal of this study was to investigate the influence of cyclic hot and cold water absorption and desorption on the flexural and impact strengths of luffa – PLA biocomposites. PLA was reinforced with heat treated luffa fibers with the fiber loadings: 5 vol.%, 10 vol.%, 15 vol.% and 20 vol.%. Based on the test results the biocomposite with the highest flexural and impact strengths was selected for water absorption and desorption cycles. The biocomposites were subjected to 56 cycles of hot and cold water absorption and desorption. The biocomposites were tested for their strengths after every 14 cycles. The absorption and desorption decreased the flexural and impact strengths, affecting the impact strength more than the flexural strength.

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Var, Sevde Mavi. "Examination of Bilateral and Unilateral Isokinetic Leg Strengths of Taekwondo Athletes and Boxers." Journal of Education and Learning 8, no. 1 (January 25, 2019): 272. http://dx.doi.org/10.5539/jel.v8n1p272.

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The purpose of this research is to examine the maximal isokinetic leg strengths of male athletes who work in different branches of taekwondo and boxing, both bilateral and unilateral, as right and left legs. Totally 32 athletes, including taekwondo athletes (n = 16) and boxer (n = 16), participated in the study. In the 2016-2017 season, the average age of these athletes is x̄ = 21.5. Biodex isokinetic system 4-Pro analyzing device was used in the study and 180 ° / s flexion and extension right and left leg maximal strength measurements were made from this measurement. Before the measurements, the athletes performed the exercise program including 15 minutes of warm-up movements and the maximal strength measurement was applied to each athlete 2 times. Their best performances were recorded and evaluated. When the findings of the study were examined, the right extension, right flexion, left extension, and left extension isokinetic strengths of the taekwondo athletes were found to be higher than the boxers. There was a very high and meaningful correlation found between right flexion and left flexion isokinetic strengths in the boxers between right extension and left extension isokinetic strengths. In Taekwondo athletes, there was a weak and meaningless correlation between right flexion and left flexion kinetic strengths and a positive correlation was found between right extension and left extension isokinetic strengths. Consequently, it was seen that isokinetic maximal leg strength of taekwondo athletes was higher than boxers. It is believed that this is due to the more intensive use of lower extremity muscles in taekwondo. Besides, in this research, there was a very high correlation between the right and left extension of the boxers and isokinetic leg strengths at the flexion while there was a weak meaningless correlation between the right flexion and left flexion isokinetic strengths of the taekwondo athletes, and a positive correlation was found between the right extension and the left extension isokinetic strengths. Thus, in the right and left isokinetic leg strength values of the boxers there was closeness, and in the right and left isokinetic strength values of them it can be said there was not so much closeness exists.

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Franks, Jessica, Edward Rawana, and Keith Brownlee. "The relationship between strengths in youth and bullying experiences at school." Educational and Child Psychology 30, no. 4 (December 2013): 44–58. http://dx.doi.org/10.53841/bpsecp.2013.30.4.44.

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Bullying is a serious problem plaguing educational systems and influencing the lives of many youth. The consequences of bullying, for both bullies and victims, are numerous and well-established, including increased emotional and behavioural problems, difficulties in peer relationships, and poor academic achievement. To date, little research has been completed that explores the role of strengths in the bullying experiences of youth. An understanding of students’ strengths could aid in the development of appropriate intervention and prevention programming and to promoting the well-being of youth. Therefore, this study examined the relationships between strengths in youth and bullying experiences within a comprehensive strength-based framework. Participants were 263 students (112 males) recruited from Grades 7 and 8 classes in Ontario, Canada. Participants completed self-report questionnaires on bullying and victimisation experiences and a broad range of personal strengths. The results of this study did not support a direct relationship between overall strengths and bullying behaviours and victimisation experiences. However, some specific strengths were identified as predictors of both bullying and victimisation. Of note, while having more strengths in some domains predicted reduced rates of bullying and victimisation, having more strengths in other domains predicted increased rates of both bullying and victimisation, suggesting a masking effect. These results highlight the importance of further exploring the relationship between strengths and bullying as well as the possible benefits of providing strength-based intervention and prevention programmes.

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Luo, Wen, Haijun Wang, Xiongwei Li, Xiaolong Wang, Zhang Wu, Yuan Zhang, Xiaoqing Lian, and Xiaojun Li. "Mechanical Properties of Reactive Powder Concrete with Coal Gangue as Sand Replacement." Materials 15, no. 5 (February 28, 2022): 1807. http://dx.doi.org/10.3390/ma15051807.

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Coal gangue (CG) represents a huge amount of industrial solid waste in China, and usually is used as a coarse aggregate to produce low-strength coal-gangue-based concrete. In this paper, in order to prove the possibility to obtain a higher-strength concrete with a higher CG utilization rate, reactive powder concrete (RPC) with coal gangue as a sand replacement at different replacement ratios was studied. RPC samples were prepared by replacing natural river sand (RS) with CG sand at different CG/RS weight ratios from 0–100% at intervals of 25%. Mechanical tests were carried out, and the microstructure features of RPC samples at 28 days were characterized. The test results showed that strong back shrinkage of strength existed. On days 7 and 14, the flexural strengths of samples with CG/RS replacement ratios of 0–75% fluctuated around the mean value. Strengths of samples with a CG/RS replacement ratio of 100% dropped off. However, on day 28, the flexural strengths of samples with CG were all lower than the strengths of samples on days 7 and 14. The flexural strengths and compressive strengths of the RPC with a CG/RS replacement ratio of 100% on day 14 were 14.09 MPa and 37.03 MPa, respectively, which decreased to 6.42 MPa and 28.44 MPa, respectively, on day 28. Compared with natural river sand, CG sand reduced the working performance, compressive strength, and flexural strength of RPC. Microscopic analysis showed that on day 28, increasing the CG replacement ratio could inhibit cement hydration, weaken the interface transition zone, and lead to the degradation of the RPC’s performance. Modification of CG sand would be helpful to obtain higher-strength concrete.

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Dieleman, Lisa M., Sarah S. W. De Pauw, Bart Soenens, Geert Van Hove, and Peter Prinzie. "Behavioral Problems and Psychosocial Strengths: Unique Factors Contributing to the Behavioral Profile of Youth With Down Syndrome." American Journal on Intellectual and Developmental Disabilities 123, no. 3 (May 1, 2018): 212–27. http://dx.doi.org/10.1352/1944-7558-123.3.212.

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Abstract This study aimed to describe problem behaviors and psychosocial strengths, examine the problem-strength interrelations, and evaluate profiles of problems and strengths in youth with Down syndrome (DS). The community-based sample consisted of 67 parents of children with DS aged between 4 and 19 years. Parents reported about the developmental age (Vineland screener), behavioral problems (Child Behavior Checklist), and psychosocial strengths (Behavioral and Emotional Rating Scale) of their child. Results indicate that attention, social, and thought problems were most prevalent, whereas family involvement and receiving/expressing affection were identified as strengths. A confirmatory factor analysis identified problems and strengths as distinct, yet related, variables. Moreover, a cluster analysis of problems and strengths identified four different profiles. Implications for interventions are discussed.

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Piracha, Naveed K., Dan Delanis, John Kaminsky, K. V. Duncan-Chamberlin, Haroon Asghar, Raheel Ali, and M. A. Baig. "Transition probabilities, oscillator strengths, and test ofJ-file sum rule for the 2p53p → 2p53s transition array in the neon emission spectra." Canadian Journal of Physics 93, no. 1 (January 2015): 80–84. http://dx.doi.org/10.1139/cjp-2014-0192.

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In this work experimental transition probabilities, line strengths, and atomic oscillator strengths of 30 spectral lines corresponding to the 2p53p → 2p53s transitions array of neon have been deduced using a neon-filled hollow cathode lamp in conjunction with two spectrographs covering the wavelength region from 500 to 1000 nm. The experimental absolute transition probabilities have been determined using the relative intensity method and lifetimes of the excited states. The transition probabilities have been converted to the line strengths data and used for testing the J-file sum rule. Relative line strengths of all the lines have been computed to determine the oscillator strength values. The measured transition probabilities, oscillator strengths, and relative line strengths agree well with the previously reported data.

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Karwowski, Waldemar. "Dynamic Lifting Strengths of Male and Female Teams: A Comparative Study." Proceedings of the Human Factors Society Annual Meeting 31, no. 4 (September 1987): 467–70. http://dx.doi.org/10.1177/154193128703100418.

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The objective of this study was to compare dynamic lifting strengths of females and males working in teams of two and three members. The experimental data from two laboratory experiments was used for the purpose of statistical comparison of team strength values for dynamic back extension and dynamic lifting strengths. 15 two-member teams, all male and all female, and 20 three-member teams, all male and all female, participated in the study. Comparison of the team strengths for males and females indicates that on the average, female 2-person strengths account for about 65% and 62% of that of males for dynamic lift and back extension, respectively. For the teams of three people, females are weaker than males by about 28% and 21%, with respect to dynamic lift and back extension strength measures, respectively.

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ISHII, Hitoshi, and Motoshi TERAO. "Giga-cycle fatigue strengths of notched high strength steel specimens." Proceedings of the JSME annual meeting 2003.1 (2003): 139–40. http://dx.doi.org/10.1299/jsmemecjo.2003.1.0_139.

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Odell, Tim. "Promoting Foster Carer Strengths: Suggestions for Strengths-Based Practice." Adoption & Fostering 32, no. 1 (April 2008): 19–28. http://dx.doi.org/10.1177/030857590803200104.

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Rapp, R. C. "The Strengths Perspective: Proving "My Strengths" and "It Works"." Social Work 52, no. 2 (April 1, 2007): 185–86. http://dx.doi.org/10.1093/sw/52.2.185.

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Babu, Dr J. Narendra, Diwakar T.M., Dhanashri M.Biradar, and Tavade Dr.C.M. "Upcoming Strengths on Internet of Things." Journal of Advanced Research in Dynamical and Control Systems 11, no. 11 (November 20, 2019): 192–97. http://dx.doi.org/10.5373/jardcs/v11i11/20193187.

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48

Whitley, Jessica, Edward P. Rawana, Melissa Pye, and Keith Brownlee. "Are Strengths the Solution? An Exploration of the Relationships among Teacher-rated Strengths, Classroom Behaviour, and Academic Achievement of Young Students." Articles 45, no. 3 (June 7, 2011): 495–510. http://dx.doi.org/10.7202/1003574ar.

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Strength-based approaches are being increasingly validated for use in clinical settings with children and youth. However, the role that strengths play in educational settings with typically-achieving students has yet to be examined. The present study explored the relationship among strengths, classroom behaviour, and academic achievement for a sample of 54 students in Grades 1 and 2. Results showed that teachers rated female students as having more strengths than male students. For both sexes, academic achievement was most highly related to strengths in School Functioning and prosocial behaviour. Strengths in Peer Relationships were significantly related to achievement only for male students. Discussion of these findings, as well as implications for practice are presented.

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Głodkowska, Wiesława, and Joanna Laskowska-Bury. "Proposition for Determining the Residual Strength of Fiber-Reinforced Cement Composite." Materials 15, no. 21 (October 27, 2022): 7546. http://dx.doi.org/10.3390/ma15217546.

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Designing bending elements made of fiber composites requires knowledge of the residual strengths. Residual strengths determined according to PN-EN 14651, regardless of the type of matrix and the fibers used, are characterized by a very-high coefficient of variation, about 30%. The variability of this feature is so large that the normal distribution adopted in statistical analyses, which is consistent for compressive strength or tensile strength, may, in the case of residual strengths, result in a significant overdesign of the elements. Therefore, the article proposes a novel method of determining the residual strength with the use of centrally bent square plates simply supported at the perimeter. The coefficient of variation of this characteristic in the case of plate testing is about 8%.

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Long, Wu Jian, Han Xin Lin, Zhen Rong Chen, Kai Long Zhang, and Wei Lun Wang. "Mechanical Properties of Fiber Reinforced Self-Compacting Concrete." Applied Mechanics and Materials 470 (December 2013): 797–801. http://dx.doi.org/10.4028/www.scientific.net/amm.470.797.

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The mechanical strengths of self-compacting concrete (SCC) with different strengths and different fibers were investigated. By mechanics performance testing on concrete samples, it shows that the fiber can significantly reduce strength of the self-compacting concrete during curing period. The 28d tensile strength of self-compacting concrete can be improved when steel fiber, polypropylene fiber, or polyethylene fiber were used. Moreover, steel fiber can improve the 28d compressive strength; contrarily, polypropylene fiber and polyethylene fiber can reduce the 28d compressive strength.

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