摘要 :
This study addresses the question of whether the way in which sets of query terms are identified has an impact on the effectiveness of users' information seeking efforts. Query terms are text strings used as input to an informatio...
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This study addresses the question of whether the way in which sets of query terms are identified has an impact on the effectiveness of users' information seeking efforts. Query terms are text strings used as input to an information access system; they are
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摘要 :
The production of protease by Pseudomonas fluorescens BJ-10 and degradation on milk proteins were carried out. The results showed that the growth rate and protease activity in nutrient broth were lower than in milk. The maximum vi...
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The production of protease by Pseudomonas fluorescens BJ-10 and degradation on milk proteins were carried out. The results showed that the growth rate and protease activity in nutrient broth were lower than in milk. The maximum viable counts at both 6 and 28C in milk were approximately 10–11 log colony forming units (cfu)/mL. The highest protease activity in milk reached 227.99 U/mL. The protease preferentially degraded caseins in the following order κ-casein > β- casein > αs-casein and had low activity on whey proteins. Correlation analyses showed that protease activity was significantly (P < 0.01) related to viable counts. Regression equation was y = 31416.26–31415.33/(1 + 101.64 × −26.97), R2 = 0.98. The protease showed a typical heat-stable behavior. After treatment at 130C for 3 min, more than 39.36 % activity remained. Crude protease caused coagulation of ultra high temperature milk after 5 days of storage at room temperature. We concluded that protease plays an important role in milk spoilage.
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摘要 :
Bi_2S_3 nanorods have been synthesized by the surfactant-assisting solvothermal method. When different conditions were chosen, the high-quality one-dimensional (1D) products were obtained in n-butanol-water solvent, and thioacetam...
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Bi_2S_3 nanorods have been synthesized by the surfactant-assisting solvothermal method. When different conditions were chosen, the high-quality one-dimensional (1D) products were obtained in n-butanol-water solvent, and thioacetamide decomposition provided S~(2-) for forming the single-crystalline structure of the sulfide at 120 ℃. They were characterized by HRTEM, powder X-ray diffraction and PL measurements. Their formation mechanism was also proposed.
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摘要 :
A Ti-50.4 at.%Ni alloy ingot was prepared and rolled into plate of 1-mm thickness at 1025 K. The hot-rolled plate was cold rolled at room temperature to the extent of 50% reduction in thickness and annealed at 573, 693 and 753 K, ...
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A Ti-50.4 at.%Ni alloy ingot was prepared and rolled into plate of 1-mm thickness at 1025 K. The hot-rolled plate was cold rolled at room temperature to the extent of 50% reduction in thickness and annealed at 573, 693 and 753 K, respectively. The investigated results revealed that 693 K annealed specimen had a homogeneous nanocrystalline structure with the grain size about 30 nm and showed the best superelasticity. The relation between the microstructure and the superelasticity has been discussed in the present report.
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The ternary metal chalcogenide ZnIn_2S_4 flower-like hollow microsphere was synthesized by a solvother-mal reaction of Zn(CH_3COO)_2 · 2H_2O, InCl_3 · 4H_2O and L-cysteine in ethylene glycol at 160 C for 24 h. The crystal struct...
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The ternary metal chalcogenide ZnIn_2S_4 flower-like hollow microsphere was synthesized by a solvother-mal reaction of Zn(CH_3COO)_2 · 2H_2O, InCl_3 · 4H_2O and L-cysteine in ethylene glycol at 160 C for 24 h. The crystal structure was characterized by X-ray diffractometry. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses show that the products consist of hollow microspheres made up of nanosheets and the thickness of the nanosheets is found to be less than 10 nm. A possible mechanism for the formation of the flower-like hollow microspheres is also proposed in this paper.
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摘要 :
Nowadays, the tremendous growth and usage of information technologies led to rapid development in the various aspects of advances in convergence and hybrid information technology, such as IT convergence in signal and image process...
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Nowadays, the tremendous growth and usage of information technologies led to rapid development in the various aspects of advances in convergence and hybrid information technology, such as IT convergence in signal and image processing, human-computer interaction, robotics, transportation system, and health care. The spread of current technologies is more emanative at all stages of research, development, diffusion, and use. Moreover, different regions of research and applications are often integrated together to achieve better performance, solve problems, and restructure systems, as well as improve the computational intelligence in both theoretical and practical aspects. Hence, the convergence of information technologies could lead to the new stage of innovation with significant increasing speed.
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