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1.
Mingjun Yuan Andreas Winardi Shaoqin Gong Lih‐Sheng Turng 《Polymer Engineering and Science》2005,45(6):773-788
The effects of submicron core‐shell rubber (CSR) particles, nanoclay fillers, and molding parameters on the mechanical properties and cell structure of injection‐molded microcellular polyamide‐6 (PA6) composites were studied. The experimental results of PA6 nanocomposites with 5.0 and 7.5 wt% nanoclay loadings and of CSR‐modified PA6 composites with 0.5 and 3.1 wt% CSR loadings were compared to their neat resin counterparts. This study found that nanoclay was more efficient in promoting a smaller cell size, larger cell density, and higher tensile strength for microcellular injection molding parts. A higher nanoclay loading led to more brittle behavior for microcellular parts. It was found that a proper amount of CSR particles could be added to the microcellular injection‐molded PA6 to reduce the cell size, increase the cell density, and enhance the toughness of the molded part. However, CSR particles were less effective cell nucleation agents as compared to nanoclay for producing desirable cell structures, and a higher CSR loading was found to have diminishing effects on the process and on the properties of the parts. POLYM. ENG. SCI., 45:773–788, 2005. © 2005 Society of Plastics Engineers 相似文献
2.
Fauziatul Fajaroh Heru Setyawan W. Widiyastuti Sugeng Winardi 《Advanced Powder Technology》2012,23(3):328-333
A simple surfactant-free electrochemical method is proposed for the preparation of magnetite nanoparticles using iron as the anode and plain water as the electrolyte. This study observed the effects of certain parameters on the formation of magnetite nanoparticles and their mechanism in the system, including the role of OH? ions, the distance between electrodes and current density. We found that OH? ions play an important role in the formation of magnetite nanoparticles. Particle size can be controlled by adjusting the current density and the distance between electrodes. Particle size increases by increasing the current density and by decreasing the distance between electrodes. Particle formation cannot be favored when the distance between electrodes is larger than a critical value. The magnetite nanoparticles produced by this method are nearly spherical with a mean size ranging from 10 to 30 nm depending on the experimental conditions. They exhibit ferromagnetic properties with a coercivity ranging from 140 to 295 Oe and a saturation magnetization ranging from 60 to 70 emu g?1, which is lower than that of the corresponding bulk Fe3O4 (92 emu g?1). This simple method appears to be promising as a synthetic route to producing magnetite nanoparticles. 相似文献
3.
Manabu Shimada Heru Setyawan Yutaka Hayashi Nobuki Kashihara Kikuo Okuyama Sugeng Winardi 《Aerosol science and technology》2013,47(5):408-414
The effects of gas flow rate on particle formation and film deposition during the preparation of silica thin film using a TEOS/O2 plasma were investigated. Particle formation and growth are suppressed with increasing gas flow rates. The film deposition rate increases with increasing gas flow rate, reaches a maximum value, and eventually decreases again. However, the uniformity of the film tends to degrade at high gas flow rates. At a high gas flow rate, some particles trapped in the sheath near the grounded electrode pass through the sheath to reach the substrate and are then embedded in the growing film. A self-consistent sheath model combined with particle force balance based on charge fluctuation was developed to explain these experimental findings qualitatively. The model reveals that charge fluctuation is a key factor for the particle to overcome the potential barrier of the negatively charged particles to pass through the sheath, eventually reaching the substrate. The model further shows that the probability of a particle being deposited on the substrate is higher for increased gas flow rates, which correctly predicts the experimentally observed trend. 相似文献
4.
W. Widiyastuti Adhi Setiawan Sugeng Winardi Tantular Nurtono Heru Setyawan 《Frontiers of Chemical Science and Engineering》2014,8(1):104-113
The particle formation mechanism of hydroxyapatite precursor containing two components, Ca(OOCCH3)2 and (NH4)2HPO4 with a ratio of Ca/P = 1.67, in a spray pyrolysis process has been studied by computational fluid dynamics (CFD) simulation on the transfer of heat and mass from droplets to the surrounding media. The focus included the evaporation of the solvent in the droplets, a second evaporation due to crust formation, the decomposition reaction of each component of the precursor, and a solid-state reaction that included the kinetic parameters of the precursor regarding its two components that formed the hydroxyapatite product. The rate of evaporation and the reacted fraction of the precursor both increased with temperature. The predicted average size of the hydroxyapatite particles agreed well with the experimental results. Therefore, the selected models were also suitable for predicting the average size of particles that contain two components in the precursor solution. 相似文献
5.
Sugeng Triwahyono Aishah Abdul Jalil Sharifah Najiha Timmiati Nurun Najwa Ruslan Hideshi Hattori 《Applied Catalysis A: General》2010,372(1):103-107
The rate controlling step and the energy barrier involved in the hydrogen adsorption over Pt/MoO3 were studied. Rates of hydrogen adsorption on Pt/MoO3 were measured at the adsorption temperature range of 323–573 K and at the initial hydrogen pressure of 6.7 kPa. The rate of hydrogen uptake was very high for the initial few minutes for adsorption at and above 473 K, and reached equilibrium within 2 h. At and below 423 K, the hydrogen uptake still continued and did not reach equilibrium after 10 h. The hydrogen uptake exceeded the H/Pt ratio of unity for adsorption at and above 423 K, indicating that hydrogen adsorption involves hydrogen atom spillover and surface diffusion of the spiltover hydrogen atom over the bulk surface of MoO3 followed by formation of HxMoO3. The hydrogen uptake was scarcely appreciable for Pt-free MoO3. The rate controlling step of the hydrogen adsorption on Pt/MoO3 was the surface diffusion of the spiltover hydrogen with the activation energy of 83.1 kJ/mol. The isosteric heats of hydrogen adsorption on Pt/MoO3 were 18.1–16.9 kJ/mol for the hydrogen uptake range 2.4–2.8 × 1019 H-atom/g-cat. Similarities and differences in hydrogen adsorption on Pt/SO42?–ZrO2, Pt/WO3–ZrO2 and Pt/MoO3 catalysts are discussed. 相似文献
6.
Daniel Winardi Pei-Yi Chu Guan-Yu Chen Ke Wang Wei-Yu Hsu Ching-Liang Hsieh Yung-Hsiang Chen Yang-Chang Wu Juan-Cheng Yang 《International journal of molecular sciences》2022,23(3)
Aurora A kinase (Aurora A) is a serine/threonine kinase regulating control of multiple events during cell-cycle progression. Playing roles in promoting proliferation and inhibiting cell death in cancer cells leads Aurora A to become a target for cancer therapy. It is overexpressed and associated with a poor prognosis in ovarian cancer. Improving cisplatin therapy outcomes remains an important issue for advanced-stage ovarian cancer treatment, and Aurora A inhibitors may improve it. In the present study, we identified natural compounds with higher docking scores than the known Aurora A ligand through structure-based virtual screening, including the natural compound fangchinoline, which has been associated with anticancer activities but not yet investigated in ovarian cancer. The binding and inhibition of Aurora A by fangchinoline were verified using cellular thermal shift and enzyme activity assays. Fangchinoline reduced viability and proliferation in ovarian cancer cell lines. Combination fangchinoline and cisplatin treatment enhanced cisplatin–DNA adduct levels, and the combination index revealed synergistic effects on cell viability. An in vivo study showed that fangchinoline significantly enhanced cisplatin therapeutic effects in OVCAR-3 ovarian cancer-bearing mice. Fangchinoline may inhibit tumor growth and enhance cisplatin therapy in ovarian cancer. This study reveals a novel Aurora A inhibitor, fangchinoline, as a potentially viable adjuvant for ovarian cancer therapy. 相似文献
7.
刘素庚 《石油地球物理勘探》1986,21(4):422-429
地震波的传播速度可表示为地层中各点坐标的函数,即 V=f(x,y,z)。影响速度的因素是很多的,如岩性、埋深、时代、构造发展史……,因此,速度的横向变化是不可忽视的。显然,用一个统一的速度去解决地质问题已经不能适应勘探发展的要求。变速处理地震剖面已经实现,但在解释上变速成图还是一个难题,其主要困难是如何进行空间归位。无论是用水平叠加剖面成图,还是用叠偏剖面成图,速度的横向变化都是一个难以解决的问题,即使分区成图,内插也相当复杂。因此,必须寻找解决问题的方法。本文就是从 t_0时间上入手,使问题大大简化,即把速度的变化转化为 t_0值的变化,从而实现了变速成图。 相似文献
8.
刘素庚 《石油地球物理勘探》1987,22(5):569-582
横波地震勘探在我国还处于初期阶段。在东濮凹陷文留地区和内蒙赛汉塔拉地区开展的横波地震勘探工作,取得了一些有意义的结果。1. 获得了vs、vp/vs、σ和岩性及油气变化的关系曲线,这些曲线可以作为岩性解释和烃类检测的依据。2. 纵波主频约为横波主频的2~2.5倍,而且横波的频带比较窄,这和以往的结论是不一致的。 3.把纵横波剖面分别和井孔中地层连接时,横波剖面更为可靠。横波剖面对于识别小断层、小幅度构造和追踪薄砂层也更有效果。 相似文献
9.
Abdul Rohman Anjar Windarsih Sugeng Riyanto Sudjadi Shahrel Ahmad Shuhel Ahmad Arieff Salleh Rosman 《International Journal of Food Properties》2016,19(3):680-687
Avocado oil is one of the functional oils having high quality and high price in the market. This oil shows many benefits for the human health and is applied in many cosmetic products. The authentication of avocado oil becomes very important due to the possible adulteration of avocado oil with other lower priced oils, such as palm oil and canola oil. In this study, Fourier transform infrared spectroscopy using attenuated total reflectance in combination with chemometrics techniques of partial least squares and principal component regression is implemented to construct the quantification and classification models of palm oil and canola oil in avocado oil. Partial least squares at the wavenumbers region of 1260–900 cm–1 revealed the best calibration models, having the highest coefficient of determination (R2 = 0.999) and the lowest root mean square error of calibration, 0.80%, and comparatively low root mean square error of prediction, 0.79%, for analysis of avocado oil in the mixture with palm oil. Meanwhile, the highest R2, root mean square error of calibration, and root mean square error of prediction values obtained for avocado oil in the mixture with canola oil at frequency region of 3025–2850 and 1260–900 cm–1 were 0.9995, 0.83, and 0.64%, respectively. 相似文献
10.
F. Sugeng H. Brauer H. D. Baehr J. H. Spurk Jüntgen Jockers Klein 《Forschung im Ingenieurwesen》1981,47(5):168-168