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1.
Small-scale models of reinforced concrete beam-column joint were subjected to large cyclic displacements at two rates: 2.5×10−3 and 1.0 Hz. To assess damage, free-vibration tests were conducted. The reliability of the modelling techniques was established
by comparison of the results for the slower rate with those obtained from the full-scale tests on prototype. The higher rate
of loading caused a greater damage than that at the lower rate. This was evidenced by the measurements of the energy absorbed
in the hysteresis loops, equivalent damping, and the stiffness and damping obtained from the free-vibration test. The relatively
greater extent of damage appears to result from the different bond behaviour at different rates of loading. 相似文献
2.
Ming-Liang Zhu Hui-Juan Qian Rui-Xia Yuan Dong-Yan Zhao Hai-Chao Huang Huai-Yuan Wang 《石油科学(英文版)》2021,(3):951-961
In this paper,the superhydrophobic poly(vinylidene fluoride)/fluorinated ethylene propylene/SiO2/CNTs-EDTA(PFSC-EDTA)composite coating was successfully fabricat... 相似文献
3.
无机结垢趋势预测技术在油田开采中的应用 总被引:16,自引:2,他引:16
在油田注水开发过程中结垢问题变得越来越严重,结垢造成了油田开采过程中大量的经济损失,尤其是低渗透油田损失更大,为了高效开发低渗透油田,应对油田水结垢进行科学预测并提出合理的防垢措施。本文首次对大庆龙虎泡油田水结垢进行了定性分析,在前人研究基础上利用经典溶液理论、离子缔合理论及多元非线性回归技术建立了地层无机结垢饱和度指数预测方程,编帛了预测软件PIOS1.0,应用该预测软件对大庆龙虎泡油田水进行了结垢预测。本工作结果表明,龙虎泡油田结垢主要是碳酸钙垢,含有少量硫酸钙垢,结垢最严惩区域,主要在油气井近井地带,与实际情况基本吻合。 相似文献
4.
The effect of oxide additives on the low-temperature sintering and dielectric properties of microwave dielectrics (Zn,Mg)TiO3 have been investigated. The study showed that a small amount of V2O5 accelerated the densification rate of (Zn,Mg)TiO3 dielectrics as compared with the other oxide additives. In addition to lower sintering temperature of zinc titanate dielectrics, the addition of V2O5 decreased the decomposition temperature of (Zn,Mg)TiO3. Additionally, the increased amount of magnesium raised both the sintering temperature and the decomposition temperature of (Zn,Mg)TiO3. Relative permittivity of (Zn,Mg)TiO3 dielectrics decreased accompanied with increase of Q × f as the amount of magnesium content increased. The temperature coefficient of resonant frequency of (Zn,Mg)TiO3 shifted to more negative values as the amount of magnesium increased. 相似文献
5.
Won-Chun Oh Feng-Jun Zhang Ming-Liang Chen 《Journal of Industrial and Engineering Chemistry》2010,16(2):299-304
C60/TiO2 and V–C60/TiO2 composite photocatalysts were prepared with titanium (IV) n-butoxide (TNB) by a sol–gel method. Fullerene had absorptive and semiconducting properties, and vanadium could enhance the photogenerated electron transfer. The V–C60/TiO2 composite shows a good photo-degradation activity. XRD patterns of the composites showed that the C60/TiO2 composite contained a mixture of anatase and rutile phase forms while the V–C60/TiO2 composite contained a typical single and clear anatase phase. The surface properties seen by SEM and FE-SEM present a characterization of the texture on C60/TiO2 and V–C60/TiO2 composites and showed a homogenous composition in the particles for the titanium sources used. The EDX spectra for the elemental identification showed the presence of C and Ti with strong V peaks for the V–C60/TiO2 composite. From the photocatalytic results, the excellent activity of the C60/TiO2 and V–C60/TiO2 composites for degradation of methylene blue under UV irradiation could be attributed to both the effects between photocatalysis of the supported TiO2 and charge transfer of the fullerene, and the introduction of vanadium to enhance the photogenerated electrons transfer. 相似文献
6.
Shuang Zheng Ming-Liang Chang Jing Zhou Jing-Wei Fu Qing-Wei Zhang Shao-Yong Li Wei Qiao Jun-Min Liu 《International journal of molecular sciences》2014,15(6):9844-9858
For all microhelices on aromatic rings of inherently chiral calix[4]arene, an expression was derived from one approximation and one hypothesis on the basis of the electron-on-a-helix model of Tinoco and Woody as follows: , where µ = 1 for the right-handed microhelix and µ = −1 for the left-handed microhelix; and H and K are constant and greater than zero. The expression correlates microhelical electronic energy (E) with the atom polarizability difference (Δα) on both microhelix ends, which intuitively and clearly shows the impact of helical substituent polarizability on helical electronic energy. The case analysis almost entirely proves that the qualitative analysis of the helical electronic energy of inherently chiral Calix[4]arenes with the expression is scientific and can be used to effectively assign their absolute configuration. 相似文献
7.
Two types of carbon nanotube/TiO2 and silver-treated carbon nanotube/TiO2 electrodes were prepared and characterized by X-ray diffraction, transmission and scanning electron microscopy, energy dispersive X-ray analysis, photoelectrocatalytic activity and antibacterial activity. The photoelectrocatalytic degradation of a methylene blue solution was attributed to the combined effects of the photo-degradation of TiO2, the electron assistance of carbon nanotube network and the enhancement of silver and was a function of the applied potential. The composites treated with silver showed enhanced photo-degradation of methylene blue, and the photoelectrocatalytic activity increased with increasing amount of silver. The silver-treated carbon nanotube/TiO2 prepared as bactericides have stronger antibacterial activity against Escherichia coli K-12 than standard ampicillin, tetracycline and carbon nanotube/TiO2 under sunlight or dark conditions. The presence of silver in the silver-treated carbon nanotube/TiO2 composites enhanced the inactivation of the E. coli K-12. 相似文献
8.
Xiao-Jie?Liu Yu?Feng Ming-Liang?Fu Ya-Chen?Dong Qi-He?ChenEmail author Ying-Chun?Jiao 《European Food Research and Technology》2011,233(6):941-949
Proteinase A (PrA) is one of the most significant vacuolar proteinase in S. cerevisiae, and it plays an important role in S. cerevisiae physiology and metabolism, especially under unfavorable environment. In this study, the differences in pyruvate kinase (PYK)
level under fructose-1,6-diphosphate (FDP) induction and ATP synthesis block among SC1 (the wild-type yeast that was industrial
Saccharomyces cerevisiae WZ65), SC2 (PEP4 partial deletion) and SC3 (PEP4 complete deletion) were examined. Results showed that the induction caused by FDP clearly increased PYK expression no matter
for which strain, but the increasing effect is more significant for SC2 (P < 0.05). The comparative results of intracellular ATP accumulation showed that the induction by FDP may be affected at the
presence of PrA. The block experiment of ATP synthesis showed that PYK activities in PEP4-modified strains are lower than that of the wild type, but the intracellular ATP levels in the wild-type one are generally
higher than the PEP4-modified strains after rotenone treatment (P < 0.01). This implies that the effect of PrA deficiency on intracellular ATP accumulation was much more pronounced than the
effect of rotenone on oxidative phosphorylation. The cell morphology of three strains was comparatively examined by means
of transmission electron microscopy (TEM). The PEP4-modified strains possessed more vacuoles, and cell structure were more integrated than the wild-type strain. Current data
preliminarily indicated that the deletion of PEP4 gene in industrial S. cerevisiae WZ65 may not only affected PYK expression but also modulated the oxidative phosphorylation flux. 相似文献
9.
10.
Hung-Sying Jing Ming-Liang Liao 《International journal for numerical methods in engineering》1989,28(12):2813-2827
A new element—a partial hybrid stress element—is proposed in this paper for the analysis of thick laminated composite plates. The variational principle of this element can be derived from the Hellinger–Reissner principle through dividing six stress components into a flexural part (σx, σy, σxy, σz) and a transverse shear part (τxy, τyz). The element stiffness matrix can be formulated by assuming a stress field only for transverse shear stresses, while all the others are obtained from an assumed displacement field. Consequently, this new element combines the benefits of the conventional displacement method and the hybrid stress method. A twenty-node hexahedron element is employed in each layer for the displacement field. For the assumed transverse shear stress field, only the traction-free boundary conditions and interface traction continuity are satisfied. The equilibrium equation is enforced by the variational principle. Hence, the complicated work of searching an equilibrating stress field for all the six stress components in the hybrid stress method can be avoided. Furthermore, the interlaminar traction discontinuity, especially transverse shear, encountered by the conventional displacement method and higher-order plate element for laminated plate analysis can also be overcome. Examples are illustrated to demonstrate the accuracy and efficiency of this proposed partial hybrid stress element. 相似文献