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S.M. Zhang,J. Liu,W. Zhou,L. Cheng,X.D. Guo 한국물리학회 2005 Current Applied Physics Vol.5 No.5
Based on surface modication of hydroxyapatite with silane derivatives, interfacial fabrications of hydroxyapatite (HAP)/poly-lactide (PLA) resorbable bone xation composites are realized. The results indicate that interfacial adhesion, swelling property, andultimate mechanical properties of the HAP/PLA composites are signicantly improved. As a result, the maximum bending strengthenhances 27.8%. Scanning electron microscopy (SEM) observation suggests that the modied HA particles are homogeneously dis-persed in the composites, their size ranges are about 215l m. The modied HA/PLA composites are of toughened rupture. Thisconclusion is consistent with bending property of the composites. Finally, a possible mechanism for the interfacial adhesion is alsodiscussed..
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Variability of measured modal frequencies of a cable-stayed bridge under different wind conditions
Y.Q. Ni,J.M. Ko,X.G. Hua,H.F. Zhou 국제구조공학회 2007 Smart Structures and Systems, An International Jou Vol.3 No.3
A good understanding of normal modal variability of civil structures due to varying environmental conditions such as temperature and wind is important for reliable performance of vibration-based damage detection methods. This paper addresses the quantification of wind-induced modal variability of a cable-stayed bridge making use of one-year monitoring data. In order to discriminate the wind-induced modal variability from the temperature-induced modal variability, the one-year monitoring data are divided into two sets: the first set includes the data obtained under weak wind conditions (hourly-average wind speed less than 2 m/s) during all four seasons, and the second set includes the data obtained under both weak and strong (typhoon) wind conditions during the summer only. The measured modal frequencies and temperatures of the bridge obtained from the first set of data are used to formulate temperature-frequency correlation models by means of artificial neural network technique. Before the second set of data is utilized to quantify the wind-induced modal variability, the effect of temperature on the measured modal frequencies is first eliminated by normalizing these modal frequencies to a reference temperature with the use of the temperature-frequency correlation models. Then the wind-induced modal variability is quantitatively evaluated by correlating the normalized modal frequencies for each mode with the wind speed measurement data. It is revealed that in contrast to the dependence of modal frequencies on temperature, there is no explicit correlation between the modal frequencies and wind intensity. For most of the measured modes, the modal frequencies exhibit a slightly increasing trend with the increase of wind speed in statistical sense. The relative variation of the modal frequencies arising from wind effect (with the maximum hourly-average wind speed up to 17.6 m/s) is estimated to range from 1.61% to 7.87% for the measured 8 modes of the bridge, being notably less than the modal variability caused by temperature effect.
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Variability of measured modal frequencies of a cable-stayed bridge under different wind conditions
Ni, Y.Q.,Ko, J.M.,Hua, X.G.,Zhou, H.F. Techno-Press 2007 Smart Structures and Systems, An International Jou Vol.3 No.3
A good understanding of normal modal variability of civil structures due to varying environmental conditions such as temperature and wind is important for reliable performance of vibration-based damage detection methods. This paper addresses the quantification of wind-induced modal variability of a cable-stayed bridge making use of one-year monitoring data. In order to discriminate the wind-induced modal variability from the temperature-induced modal variability, the one-year monitoring data are divided into two sets: the first set includes the data obtained under weak wind conditions (hourly-average wind speed less than 2 m/s) during all four seasons, and the second set includes the data obtained under both weak and strong (typhoon) wind conditions during the summer only. The measured modal frequencies and temperatures of the bridge obtained from the first set of data are used to formulate temperature-frequency correlation models by means of artificial neural network technique. Before the second set of data is utilized to quantify the wind-induced modal variability, the effect of temperature on the measured modal frequencies is first eliminated by normalizing these modal frequencies to a reference temperature with the use of the temperature-frequency correlation models. Then the wind-induced modal variability is quantitatively evaluated by correlating the normalized modal frequencies for each mode with the wind speed measurement data. It is revealed that in contrast to the dependence of modal frequencies on temperature, there is no explicit correlation between the modal frequencies and wind intensity. For most of the measured modes, the modal frequencies exhibit a slightly increasing trend with the increase of wind speed in statistical sense. The relative variation of the modal frequencies arising from wind effect (with the maximum hourly-average wind speed up to 17.6 m/s) is estimated to range from 1.61% to 7.87% for the measured 8 modes of the bridge, being notably less than the modal variability caused by temperature effect.
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Wenli Pei,Fazeng Lian,Meng Fu,Guiqin Zhou,M. Takahashi 한국자기학회 2004 Journal of Magnetics Vol.9 No.4
The crystallization behaviours of nanocomposite made by a function of quenching rate (roller speed) were studied. The results showed that there was one step crystallization process for the alloy quenched at roller speed of 32 ㎧, which could be shown as, Am (amorphouse) + α-Fe+Nd₂Fe₁₄B → α-Fe+Nd₂Fe₁₄B. For the alloy quenched at roller speed of 40 ㎧, there was two steps crystallization process taking place at different temperatures, which could be shown as, Am → α-Fe+Nd₂Fe₂₃B₃+Nd₂Fe₁₄B+Am' → α-Fe+Nd₂Fe₁₄B. The presence of transition phase (Nd₂Fe₂₃B₃) was harmful to get fine and uniform grain size during crystallization process. Uniform microstructures and high magnetic properties could be attained for the as-quenched alloy containing less amorphous phase and no presence of transition phase during annealing treatment. For the alloy prepared at roller speed of 32 m/s, the following properties were obtained, Br = 0.904 T, iHc = 801 ㎄/m, (BH)max = 122 kJ/㎥ and Mr/Ms = 0.6.
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Z. P. Zhang,J. D. Liu,K. Q. Qiu,Y. Y. Huang,J. G. Li,X. G. Wang,J. L. Liu,M. Wang,M. K. Zou,Y. Z. Zhou 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
A novel fourth-generation nickel-based single crystal superalloy was bonded by vacuum brazing at 1230 °C, 1260 °C and1290 °C for 60 min using a new type of Co-based filler alloy. The effects of the brazing temperature on the microstructureand mechanical properties of the brazed joint were investigated. The brazed joint was mainly composed of the non-isothermalsolidification zone (M3B2 type-boride, CrB boride, Ni3Bboride and MC carbide), isothermal solidification zone (γ and γ'Phase) and base metal. With the increase of brazing temperature, the volume fraction of borides and γ' phase in the centerof the joint decreased and increased, respectively. The high-temperature tensile test results show that the tensile strength ofthe joints was improved with increasing brazing temperature, and the maximum tensile strength of the joint was 766 MPaafter brazing at 1290 °C for 60 min. Fracture observation shows that the fracture modes of the joints were the same, whichbelongs to the typical quasi cleavage fracture. The element distribution in the joint was homogenized to a certain extent at1290 °C. The segregation of Si and Ru was found, but they were still dissolved in the γ solid solution. The experimentalresults help to better understand the microstructure characteristics of the novel fourth-generation nickel-based single crystalsuperalloy and provide guidance for further optimizing the process parameters of the brazed joint.
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Zhou Xian,Al-Khazaleh Ahmad,Afzal Sualiha,Kao Ming-Hui (Tim),Münch Gerald,Wohlmuth Hans,Leach David,Low Mitchell,Li Chun Guang 한국응용약물학회 2023 Biomolecules & Therapeutics(구 응용약물학회지) Vol.31 No.1
Extensive research supported the therapeutic potential of curcumin, a naturally occurring compound, as a promising cytokinesuppressive anti-inflammatory drug. This study aimed to investigate the synergistic anti-inflammatory and anti-cytokine activities by combining 6-shogaol and 10-shogaol to curcumin, and associated mechanisms in modulating lipopolysaccharides and interferon-ɣ-induced proinflammatory signaling pathways. Our results showed that the combination of 6-shogaol-10-shogaolcurcumin synergistically reduced the production of nitric oxide, inducible nitric oxide synthase, tumor necrosis factor and interlukin- 6 in lipopolysaccharides and interferon-γ-induced RAW 264.7 and THP-1 cells assessed by the combination index model. 6-shogaol-10-shogaol-curcumin also showed greater inhibition of cytokine profiling compared to that of 6-shogaol-10-shogaol or curcumin alone. The synergistic anti-inflammatory activity was associated with supressed NFκB translocation and downregulated TLR4-TRAF6-MAPK signaling pathway. In addition, SC also inhibited microRNA-155 expression which may be relevant to the inhibited NFκB translocation. Although 6-shogaol-10-shogaol-curcumin synergistically increased Nrf2 activity, the anti-inflammatory mechanism appeared to be independent from the induction of Nrf2. 6-shogaol-10-shogaol-curcumin provides a more potent therapeutic agent than curcumin alone in synergistically inhibiting lipopolysaccharides and interferon-γ induced proinflammatory mediators and cytokine array in macrophages. The action was mediated by the downregulation of TLR4/TRAF6/MAPK pathway and NFκB translocation.
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D.V. Faustino,G.P. Yumul, Jr.,C.B. Dimalanta,J.V. de Jesus,M-F. Zhou,J.C. Aitchison,R.A. Tamayo, Jr. 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The Early Cretaceous Southeast Bohol Ophiolite-Cansiwang Mlange Complex and the Alicia Schist form thebasement of southeastern Bohol Island in central Philippines.New geochemical data show that four discrete groups consti-tute the volcanic and associated hypabyssal rocks of the ophi-olite-mlange complex: boninitic rocks (BON), enriched andnormal mid-ocean ridge basalt-like rocks (E-MORB; N-MORB) and high-magnesian andesites (HMA). Of these fourgroups, the BON are the most depleted in REEs and with themost pronounced negative Nb anomalies. Both MORB-liketypes exhibit subduction-zone influence as reflected in theirslight negative Nb anomalies. Characteristically with flat andLREE-depleted patterns, the HMA samples apear to mimicN-MORB patterns but with lower REE concentrations. Thisgeochemical diversity is best explained by a suprasubductionzone environment of formation as is also evident from field geo-believed to have ben concurrent with the ophiolite’s emplace-ment by subduction-accretion along a forearc margin. This tec-tonic boundary was later jammed into inactivity with the entryof the Alicia Schist that most likely was an oceanic bathymetrichigh. The intercalation of both tufaceous materials and pelagicchert with the pillow basalts are consistent with a marginalbasin tectonic setting.
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Zhou, P.,Tan, Y.Q.,Zhang, L.,Zhou, Y.M.,Gao, F.,Zhou, G.H. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.9
This study was designed to investigate the effects of basal diets supplemented with a clay product consisting of zeolite and attapulgite (ZA) at 1:1 ratio on growth performance, digestibility of feed nutrients, activities of digestive enzymes in small intestine and intestinal health in broiler chickens. In experiment 1, 112 one-day-old male chickens were randomly divided into 2 groups with 8 replicates of 7 chickens each. In experiment 2, 84 one-day-old male chickens were randomly allocated into 2 groups consisting 6 replicates of 7 chickens each. The experimental diets both consisted of a maize-soybean basal control diet supplemented with 0% or 2% ZA. The diets were fed from 1 to 42 days of age. The results showed that ZA supplementation could increase body weight gain (BWG) and feed intake (FI), but had no significant effect on feed conversion ratio. The apparent digestibility values of crude protein and gross energy were significantly increased (p<0.05) by ZA from 14 to 16 d and 35 to 37 d. Dietary ZA treatment significantly increased (p<0.05) the activities of amylase, lipase and trypsin in jejunal digesta and the activities of maltase and sucrase in jejunal mucosa on days 21 and 42. The ZA supplementation also significantly increased (p<0.05) the catalase activity, reduced (p<0.05) the malondialdehyde concentration in the jejunal mucosa. In addition, a decrease of serum diamine oxidase activity and an increase (p<0.05) in concentration of secretory immunoglobulin A in jejunal mucosa were observed in birds treated with ZA on 21 and 42 days. It is concluded that ZA supplementation (2%) could partially improve the growth performance by increasing BWG and FI. This improvement was achieved through increasing the secretion of digestive enzymes, enhancing the digestibilites of nutrients, promoting intestinal health of broiler chickens.
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