• Title/Summary/Keyword: Orientation Dependence

Search Result 169, Processing Time 0.027 seconds

Influences of hygrothermal environment and fiber orientation on shear correction factor in orthotropic composite beams

  • Soumia Benguediab;Fatima Zohra Kettaf;Mohammed Sehoul;Fouad Bourada;Abdelouahed Tounsi;Mohamed Benguediab
    • Coupled systems mechanics
    • /
    • v.12 no.2
    • /
    • pp.151-165
    • /
    • 2023
  • In this study, a simple method for the determination of the shear correction factor for composites beam with a rectangular cross section is presented. The plane stress elasticity assumption is used after simplifications of the expression of the stress distribution in the beam. The different fiber orientation angle and volume fraction are considered in this work. The studied structure is subjected to various loading type (thermal and hygrothermal). The numerical results obtained show that there is a dependence of the shear coefficient on the orientation of the fibers. The evolution of the shear correction factors depends not only on the orientation of the fibers and also on the volume fraction and the environment. the advantage of this developed formula of the shear correction factor is to obtain more precise results and to consider several parameters influencing this factor which are neglected if the latter is constant.

The orientations of ferroelastic domain in single Crystal, $CsPbCl_3$ ($CsPbCl_3$ 결정의 강탄성 domain의 orientations)

  • 신은정;정희태;김형국;정세영
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.7 no.1
    • /
    • pp.117-125
    • /
    • 1997
  • Ferroelastic $CsPbCl_3$ crystals were grown by the Czochralski method and Bridgman method. From XRD, DTA and the dielectric measurements, we investigated the structure and confirmed the phase transition temperatures of it. Using the polarizing microscope, we observed the ferroelastic domains and the temperature dependence of the domains. For the orientation states, we obtained the consistent result with the theoretical investigation by the crystallographical consideration. For Aizu species m3mF2/m(p) 12 orientation states are represented crystallographically.

  • PDF

Influence of grain interaction on lattice strain evolution in two-phase polycrystals

  • Han, Tong-Seok
    • Interaction and multiscale mechanics
    • /
    • v.4 no.2
    • /
    • pp.155-164
    • /
    • 2011
  • The lattice strain evolution within polycrystalline solids is influenced by the crystal orientation and grain interaction. For multi-phase polycrystals, due to potential large differences in properties of each phase, lattice strains are even more strongly influenced by grain interaction compared with single phase polycrystals. In this research, the effects of the grain interaction and crystal orientation on the lattice strain evolution in a two-phase polycrystals are investigated. Duplex steel of austenite and ferrite phases with equal volume fraction is selected for the analysis, of which grain arrangement sensitivity is confirmed in the literature through both experiment and simulation (Hedstr$\ddot{o}$m et al. 2010). Analysis on the grain interaction is performed using the results obtained from the finite element calculation based on the model of restricted slip within crystallographic planes. The dependence of lattice strain on grain interactions as well as crystal orientation is confirmed and motivated the need for more in-depth analysis.

Thickness Effect on the Structural and Electrical Properties of YBCO Thin Films Grown by Pulsed Laser Deposition (PLD로 증착된 YBCO 박막의 두께에 따른 배향성과 전기적 특성 변화)

  • 허창회;한경보;이상렬
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2001.07a
    • /
    • pp.617-619
    • /
    • 2001
  • The effect of the superconducting film thickness on the substrate temperature has been investigated. Superconducting YBCO thin films have been grown on MgO substrates by pulsed laser deposition. The dependence of the orientation of YBCO film on thickness has been investigated by X-ray diffraction technique. X-ray diffraction indicated that the film orientation was changed by increasing the film thickness and by changing the substrate temperature.

  • PDF

Effect of Sputtering and Post-Annealing Condition on The Orientation of SBN Thin Films (스퍼터링 및 후 열처리 조건변화에 따른 SBN 강유전체 박막의 배향성에 관한 연구)

  • Lee, Chae-Jong;Lee, Hee-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2006.05a
    • /
    • pp.133-135
    • /
    • 2006
  • SBN60 and SBN60/30 thin films were deposited by ion beam sputtering technique. Using the ceramic target of the same composition and Pt(100)/$TiO_2$/$SiO_2$/Si or Pt(111)/Ti/$SiO_2$/Si substrate, crystallization and orientation behavior as well as electric properties of the films were examined, Thickness was controlled to $3000{\AA}$ and the films were heat-treated at $650^{\circ}C{\sim}800^{\circ}C$. The orientation and crystallization behavior were observed which showed the dependence on processing condition($O_2$/Ar ratio, substrate temp, annealing temp...).

  • PDF

Effects of Growth Temperature on the Properties of ZnO Thin Films Grown by Radio-frequency Magnetron Sputtering

  • Cho, Shin-Ho
    • Transactions on Electrical and Electronic Materials
    • /
    • v.10 no.6
    • /
    • pp.185-188
    • /
    • 2009
  • The effects of the growth temperature on the properties of ZnO thin films were investigated by using X-ray diffraction, scanning electron microscopy, ultraviolet-visible spectrophotometry, and Hall measurements. The ZnO films were deposited by rf magnetron sputtering at various growth temperatures in the range of 100-$400{^{\circ}C}$. A strong c-axis preferred orientation is observed for all of the samples. As the growth temperature increases, the crystalline orientation of the ZnO (002) plane is not changed, but the full width at half maximum gets smaller. The dependence of the electron concentration, mobility, and resistivity on the growth temperature exhibits that the ZnO films have a higher electron concentration at higher temperatures, thus giving them a low resistivity. The optical transmittance and band gap energy, calculated from the spectra of optical absorbance, show a significant dependence on the growth temperature. As for the sample grown at $100{^{\circ}C}$, the average transmittance is about 90% in the visible wavelength range and the band gap is estimated to be 3.13 eV.

Assessment of Cognitive Disorders in Alcoholics Using the 7 Minute Screening Battery (주정의존 환자에서 7분선별검사를 이용한 인지장애의 평가)

  • Cheon, Jin-Sook;Yoon, Han-Cheol;Lee, Kwang-Young;Oh, Byoung-Hoon
    • Korean Journal of Biological Psychiatry
    • /
    • v.8 no.2
    • /
    • pp.258-265
    • /
    • 2001
  • Objectives : Chronic alcohol consumption has been known to result in various neurocognitive deficits. Many neuropsychological studies revealed that the major disturbances occurred in the executive function, learning and short-term memory, visuospatial performance function, perceptuo-motor skills, and abstraction and problem solving abilities. This study was done to identify which cognitive areas might be mainly affected. Methods : The cognitive disturbance was evaluated using the Korean Version of the Mini Mental State Examination(MMSEK) and the 7 Minute Screen(7MS) in male inpatients with alcohol dependence(N=3 : as well as in age and education level matched healthy male controls(N=30). Four individual tests of the 7MS were consisted of the Benton Temporal Orientation Test, the Enhanced Cued Recall, the Clock Drawing and the Category Fluency. Results : 1) The average scores of four individual test of the 7MS for the alcoholics were $2.77{\pm}4.38$ for the Benton Temporal Orientation Test, $13.90{\pm}2.02$ for the Memory Test(the Cued Recall $6.77{\pm}1.94$, the Uncued Recall $7.10{\pm}2.45$), $5.84{\pm}1.86$ for the Clock Drawing, and $12.58{\pm}3.29$ for the Category Fluency. Except the Benton Temporal Orientation Test, there were statistically significant differences between test scores of alcoholics and those of controls(p<0.01). 2) The alcoholics who had MMSE-K score <24 were 9.68%. The average(${\pm}S.D.$) score of the MMSE-K for the patient group($27.23{\pm}2.62$) was significantly(p<0.001) lower than that of the healthy controls($29.20{\pm}1.24$). There were no statistically significant differences between four individual test scores of the 7MS of alcoholics with the MMSE-K score <24(N=3) and those of alcoholics with the MMSE-K score ${\geq}24$(N=28). 3) Four individual test scores of the 7MS seemed to have statistically significant association with such variables as MMSE-K, duration of alcohol drinking, blood magnesium concentration, liver function and thyroid function. Conclusion : Mild deficits of cognitive areas such as orientation, memory, visuospatial abilities and verbal fluency could be found in alcohol dependence.

  • PDF

Spectrophotometric Analysis of Behavior to Tyrosine Residue in the Yellow Fluorescent Cocoon of Bombyx mori (황색 형광견 중 Tyrosine잔기 거동의 분광학적 분석)

  • Yeo, Ju-Hong;Lee, In-Jeon
    • Journal of Sericultural and Entomological Science
    • /
    • v.39 no.2
    • /
    • pp.169-173
    • /
    • 1997
  • The behavior of tyrosine(Tyr.) residue of Bombyx mori silk fiber from yellow fluorescent cocoon has been examined for the dependence of pH in aqueous silk solution under the presence of orange II salt. Through the peak separation of angular dependence of spectral pattern of 15N-Tyr. and [1-13C]-Tyr. between the fiber axis and the molecular bond direction, N-H bond in fiber as well as the orientation distribution around the fiber axis were analyzed. Also, and sericin component was obtained from these angular dependence of oriented spectral pattern. The pH dependence of the 13C NMR chemical shift of B. mori silk fibroin was examined in aqueous solution in the presince of orange II are broad at pH$\geq$7.0. However, these become sharper at pH$\geq$8.0 and remain sharp at higher pH. In these higher pH range, a chemical shift change occurs due to the deprotonation of the Tyr. side group of fibroin. At higher pH. such a hydrophobic cluster is destroyed because of the electrostatic interaction according to the deprotonation of the Tyr-OH group.

  • PDF

Thickness Dependence of Orientation, Longitudinal Piezoelectric and Electrical Properties of PZT Films Deposited by Using Sol-gel Method (솔젤법에 의해 제조한 PZT(52/48) 막의 두께에 따른 우선배향성의 변화 및 이에 따른 압전 및 전기적 물성의 변화 평가)

  • Lee, Jeong-Hoon;Kim, Tae-Song;Yoon, Ki-Hyun
    • Journal of the Korean Ceramic Society
    • /
    • v.38 no.10
    • /
    • pp.942-947
    • /
    • 2001
  • Thickness dependence of orientation on piezoelectric and electrical properties was investigated by PZT (52/48) films by diol based sol-gel method. The thickness of each layer by spinning at one time was $0.2{\mu}m$ and crack-free films could be successfully deposited on 4 inches Pt/Ti/$SiO_2$/Si substrates by 0.5 mol solutions in the range from $0.2{\mu}m$ to $3.8{\mu}m$. Excellent P-E hysteresis curves were achieved, which were attributed to the well-densified PZT films and columnar grain without pores or any defects between interlayers. The (111) preferred orientation of films were shown in the range of thickness below $1{\mu}m$. As the thickness increased, the (111) preferred orientation disappeared from $1{\mu}m$ to $3{\mu}m$ region, and the orientation of films became random above $3{\mu}m$. Dielectric constants and longitudinal piezoelectric coefficient, $d_{33}$, measured by pneumatic method were saturated around the value of about 1400 and 300 pC/N respectively above the thickness of $1{\mu}m$.

  • PDF

A Study on the Effect of Market Orientation on Relationship Specific Investment and Performance (B2B 기업의 시장지향성이 관계특유투자와 지각된 경제적 성과에 미치는 영향)

  • Kim, Kwang-Myung;Park, Ju-Sik
    • Management & Information Systems Review
    • /
    • v.38 no.4
    • /
    • pp.113-136
    • /
    • 2019
  • Business performance is the ultimate output of company's effort. So in all academic area of business, scholars have tried to identify influencing factors on the business performance. This study also try to identify the factors and relati on among factors focusing on market orientation and relationship specific investment. Based on the literature review, we developed hypotheses. To examine the hypotheses we gathered survey data from B2B companies located in the Ulsan and 288 survey data was used to the analysis. Research results are as follows. As sub-factor of market orientation intelligence generation and responsiveness to intelligence affected on the relationship specific investment significantly and relationship specific investment also affected performance significantly. But all sub-factors of market orientation didn't influenced performance significantly meaning the mediating effect of relationship specific investment between market orientation and performance. Finally, the relation between intelligence generation and relationship specific investment was moderated negatively by dependence. The theoretical and practical implications of this study and limitations were discussed.