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Wanga, M.,Zhaoa, X.G.,Tan, Z.L.,Tang, S.X.,Zhou, C.S.,Sun, Z.H.,Han, X.F.,Wang, C.W. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.8
Effects of increasing dietary rice straw on chewing activity, ruminal fermentation, and fibrolytic enzyme activity in growing goats were investigated in a $4{\times}4$ Latin Square experiment. The goats were offered four diets with an increasing proportion of rice straw (i.e. 0.05, 0.10, 0.15 and 0.20, respectively, on dry matter basis). Increasing level of rice straw increased ($P_{linear\;effect}$ <0.05) the time spent on eating, ruminating, and chewing. The ruminal pH and acetate: propionate ratio were increased ($P_{linear\;effect}$ <0.05), while the $NH_3$-N concentration was decreased ($P_{linear\;effect}$ <0.01). Increasing level of rice straw in the diet increased ($P_{linear\;effect}{\leq}0.01$) molar proportion of acetate and isovalerate, and decreased ($P_{linear\;effect}$ <0.01) molar proportion of propionate. The CMCase, xylanase and cellobiase activities in the rumen were decreased ($P_{linear\;effect}$ <0.05) with increasing level of dietary rice straw, whereas the avicelase activity was increased ($P_{linear\;effect}$ <0.01). In summary, increased level of rice straw elevated the dietary neutral detergent fibre (NDF) content in the diet and had a great impact on chewing activity and ruminal fermentation.
Morphology-controllable 3D flower-like TiO2 for UV shielding application
Yawen Wanga,Zunli Mo,Chun Zhang,Ping Zhang,Ruibin Guo,Hao Gou,Rere Hu,Xiaojiao Wei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Calliandra like rutile TiO2 hierarchical microspheres with different diameters were successfully preparedby hydrothermal method via altering reaction time. All these as synthesized unique hierarchicalmicrospheres displayed higher UV shielding capability compared with commercial P25 and anataseTiO2. Noticeably, the UV shielding efficiency of these microspheres had a close relation to their diametersand packing density of constituted nanorods. The S-24h-C sample exhibited the highest UV shieldingefficiency, which could not only block all UV light below 400 nm but also show poor photocatalyticactivity under UV light radiation, indicating its great applied potential in UV-blocking materials.
Peng Wanga,Wei Huang,GuangZhi Zhang,Zhi-hua Gao,Yu Tang,Kai Sun,XiaoYu Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Modified aluminum alkoxide prepared by alcoholysis was used as an aluminum source in the complete liquid-phase technology for the preparation of slurry catalysts. The use of the modified aluminum alkoxide afforded control over the rate of the hydrolysis/condensation reactions during the preparation of the catalyst precursors, thereby generating catalysts with a fine nano-structured active metal and metallic oxide particles. Four types of Cu–Zn–Al (molar ratio is 2:1:4) catalysts were prepared using different procedures. These catalysts were tested for CO hydrogenation at 553 K, 4.0 MPa and H2/ CO = 1.0 in a kettle with a mechanical agitator. The results indicated that the activity of the catalysts was greatly dependent on the rate of the hydrolysis/condensation reactions, and the catalyst with the best catalytic performance was obtained by controlling the hydrolysis/alcoholysis rate during catalyst synthesis by pre-alcoholysis of AIP as the aluminum source, over which the CO conversion and dimethyl ether selectivity could reach 62.6% and 62.5%, respectively.
Qiang Wanga,Ji Hyang Sohn,So Ye Park,Jin Seong Choi,Joo Young Lee,정종식 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
Pure phase K4Zr5O12 is synthesized via solid state method in the present work. Various K/Zr ratios and temperatures are applied, and the synthesis process is investigated in detail by means of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Its catalytic activity for soot oxidation is studied by temperature programmed oxidation with different types of soot/catalyst contacts. It is revealed that K4Zr5O12 is very active in the presence of 2–10% O2 for both tight and loose contacts (Tp(tight) = 335 oC, Tp(ethanol) = 355 oC and Tp(shaking) = 370 oC). Thermal stability study shows that K4Zr5O12 is highly stable up to at least 900 oC.
Shear performance of an innovative UHPFRC deck of composite bridge with coarse aggregate
Qi, Jianan,Wanga, Jingquan,Feng, Yu Techno-Press 2019 Advances in concrete construction Vol.7 No.4
This paper presents an experimental study on the structural performance of an innovative ultra-high performance fiber reinforced concrete (UHPFRC) deck with coarse aggregate of composite bridge under shear force. Test parameters included curing method and shear span-to-height ratio. Test results indicated that more short fine cracks developed beside the existing cracks due to the randomly dispersed fibers, resulting in re-distributing and homogenizing of the concrete stress beside cracks and allowing for the occurrence of more cracks with small spacing compared to normal strength concrete beams. Curing methods, incorporating steam curing and natural curing, did not have obvious effect on the nominal bending cracking strength and the ultimate strength of the test specimens. Shear reinforcement need not be provided for UHPFRC decks with a fiber volume fraction of 2%. UHPFRC decks showed superior load resistance ability after the appearance of cracks and excellent post-cracking deformability. Lastly, the current shear provisions were evaluated by the test results.
Preparation, thermal cure and ceramization of liquid precursors of SiC–ZrC
Chuanjin Huang,Zhehui Wang,Mingcun Wanga 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Liquid PEPSI–PZO, as precursor of SiC–ZrC multi-component ceramic, was prepared by facile reactiveblending method, using phenylethynylpolysilane (PEPSI) as silicon and carbon source and polyzirconoxanesal(PZO) as zirconium source. The processing capability of PEPSI–PZO met the demands ofPrecursor-infiltration–pyrolysis technique (PIP) in ceramic composites fabrication. The thermal cure wasrealized at 130–330 8C by ethynyl polymerization and condensations. The thermal cure of PEPSI–PZOprecursor was promoted by catalyst Ni(acac)2, and the curing initiation and curing peak temperaturesdecreased by 25 and 70 8C, respectively. Evidenced by ceramic yields and XRD results, the thermalpyrolysis was catalyzed by Ni(acac)2, (ceramic yield was improved by 5–10%). XRD and SEM-EDS resultsshowed that SiC–ZrC by 1600 8C pyrolysis was highly crystalline, due to the occurrence of carbothermalreduction reaction. The liquid precursor of SiC–ZrC is an ideal candidate of low cost precursors for hightemperatureceramics and ceramic matrix composites.
Haozhan Lia,Hongkang Wei,Huijuan Qiu,Yukang Wanga,Chang-an Wang,Zhipeng Xie 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Sub-micron boron carbide powders were synthesized through a gas-solid reaction process using ZIF-8-derived nanoporouscarbon and boron oxide as raw materials. The effects of calcination temperature and atmosphere, amount of boron oxide, andgas-solid reaction apparatus on phase composition and morphology of the synthesized boron carbide powders were studied. The results show that, even with sufficient boron oxide addition, it is not feasible to obtain boron carbide powder of high purityin argon environment. Although vacuum environment can significantly improve the purity of the synthesized boron carbidepowder, there are a large number of large particles of step morphology in the synthesized boron carbide powder. The improvedgas-solid reaction apparatus can effectively impede the formation of boron carbide particles of step morphology. Nearlyspherical submicron boron carbide particles with a median particle size of 480 nm and good particle size consistency couldbe synthesized at 1600 °C with 0.3 g nanoporous carbon and 10 g B2O3 under vacuum by using the improved apparatus