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차효정,Jiaqiang Li,Yifan Li,김슬옹,김윤희,권순기 한국고분자학회 2020 Macromolecular Research Vol.28 No.9
Here we report a polymeric semiconductor (ODATT) comprising alkoxy anthracene (ODA) and thienothiophene (TT) polymerized by stille coupling reaction with the Pd catalyst. The optical properties of the polymer:PC71BM blend films are used by the UV-Visible absorption spectroscopy. The ODATT blends with PC71BM exhibit a maximal power conversion efficiency of 2.2% via thermal annealing treatment. Morphological analysis of the polymer:PC71BM blend films demonstrate the influence of ODATT polymer segregation on device performance by atomic force microscopy and transmission electron microscopy. We confirmed that ODATT has enhanced fill factor after thermal annealing treatment from the reduced series and shunt resistance from morphological enhancement.
An oil-tolerant and salt-resistant aqueous foam system for heavy oil transportation
Jie Sun,Jiaqiang Jing,Neima Brauner,Li Han,Amos Ullmann 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
An oil-tolerant and salt-resistant aqueous foam system was screened out as a possible lubricant to enable cold heavy oil transportation. The microstructures and viscoelasticity and effects of heavy oil, salt and temperature on the foam stability were investigated and new rheological and drainage models were established. The results indicate the foam with multilayered shells belongs to a special microcellular foam. The viscoelasticity could be neglected due to its low relaxation time. The drainage process can be divided into three stages. The foam with quality of 67.9% maintains great stability at high oil and salt concentrations and appropriate elevated temperature.
Effect of Pluronic P123 and F127 Block Copolymer on P-glycoprotein Transport and CYP3A Metabolism
Yanbin Guan,Gao Li,Jiangeng Huang,Lan Zuo,Jiaqiang Xu,Luqin Si,Jun Qiu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.10
The aim of the present study was to evaluate the effect of pluronic P123 (P123) and pluronic F127 (F127) on intestinal P-glycoprotein (P-gp) and cytochrome P450 3A using the specific substrates rhodamine-123 (R-123) and midazolam, respectively. Caco-2 cells and everted gut sacs were used as models of intestinal mucosa to assess intestinal absorption of R-123, while rat intestinal microsomes were utilized to examine the effect of P123 and F127 on in vitro midazolam metabolism. P123 and F127 were observed to increase the intracellular accumulation of R-123 in Caco-2 cells in a dose-dependent manner. P123 significantly lowered the efflux ratio of R-123 at two concentrations in Caco-2 monolayers, whereas F127 lowered the efflux ratio only at 1%. Moreover, both pluronics markedly enhanced mucosal to serosal absorption of R-123 in excised ileum of rats. However, no significant difference in relative enzyme activity were observed between P123- or F127-treated and control groups, regardless of the concentrations of P123 and F127 studied. Collectively, these results obtained from the present study demonstrated that P123 and F127 were capable of inhibiting the intestinal P-gp activity, but had little or no effect on intestinal cytochrome P450 3A activity, indicating that P123 and F127 can potentially be used as pharmaceutical ingredients to improve the oral bioavailability of coadministered P-gp substrates via P-gp efflux pump inhibition.
Reducing the Number of Sensors in a Linear Antenna Array by ℓp Norm Minimization Algorithm
Jinli Chen,Huasong Cao,Jiaqiang Li,Junxiang Ge 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9
The excitations and locations of sensors in the non-uniformly spaced array affect the array performance such as sidelobe level and spatial resolution. Consequently, finding the optimal excitation coefficients and sensor positions of the array to produce a desired beam pattern with the smallest number of sensors is of great importance in practice. With the aim of reducing the number of the sensors in a linear antenna array, a novel method based on ℓp (0<p<1) norm minimization for optimizing both excitation coefficients and sensor locations of the array is proposed. Compared with the reweighted ℓ1 norm minimization (IRWL1) method, the proposed method can reduce more array sensors by optimizing the objective functions that include the measurements of peak sidelobe level (PSL) and array sparsity denoted by the ℓp norm of excitations. Numerical experiments have proved the effectiveness and advantages of the proposed method in the reduction of the number of the sensors of the linear antenna array.
Studies on the Technology of the Pulse Glare Sterilization and its Sterilization effects
정문언 ( Ding Wenyan ),리가강 ( Li Jiaqiang ),장로 ( Jianglu ),서강저 ( Xu Jiangning ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
Basing on the microorganism effect theories of the strong pulse light and according to the factors of the pulse light, the equipment of bacterium and detecting was made by the strong pulse light technology. The general capacitance circuit was improved and the pulse generating circuit is consisting of two powers. Used this equipment the primary experiment about the bacterium effects was finished. The result shows that the flash frequency、input voltage、 bacterium liquid depth、 bacterium liquid transparency are the main factors and its sterilizing effect is remarkable. This equipment can be applied in processing and storage engineering of agricultural products.
Cheng Yu,Lin Wang,Chuanjun Han,Jiaqiang Jing,Yuxing Li,Wuchang Wang,Mingjun Du,Xincan Song,Longyao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
The hydrate particle aggregation is crucial for the flow safety of oil and gas pipelines. In this paper, coupled with the Eulerian-Eulerian model, k-ε turbulence model and the population balance model considering the hydrate aggregation and breakage, the hydrate aggregation process is studied in the bend, and the change of the average particle size under different hydrate volume fractions is discussed. The results show that the hydrate aggregation process includes two stages in the bend, namely the rapid growth and the dynamic equilibrium. In the rapid growth stage, both the hydrate concentration and particle size in the elbow increase rapidly, and the high concentration and large particle size regions on the inside of the elbow also increase significantly. Furthermore, two types of aggregates are formed on the inside of the elbow. One is a small amount of large-particle aggregates, while the other is the relatively high concentration of medium-size aggregates. Besides, the uniform suspension with a smaller concentration and particle size is distributed on the outside of the elbow, but there are also large-size particles that aggregate and adhere near the wall of pipe. As the hydrate volume fraction increases, the hydrate average particle size increases. High concentration hydrate reaches dynamic equilibrium faster during the flow process.
Cheng Yu,Chuanjun Han,Lin Wang,Jiaqiang Jing,Yuxing Li,Wuchang Wang,Mingjun Du,Xincan Song 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Both micron-sized sand particles flowing into the pipe and the secondary formation of natural gas hydrate will pose a great threat to the flow assurance of the pipeline for hydrate exploitation. Therefore, based on the population balance model considering the aggregation and breakage of hydrate and micron-sized sand particles, the flow characteristics coupling hydrate and micron-sized sand are studied, and the effects of flow velocity are discussed. The results show that the slurry viscosity increases significantly at the lower part of the horizontal pipe where the solid particles tend to aggregate. After the slurry enters the elbow pipe, the viscosity, hydrate concentration, and particle size gradually decrease, while the sand concentration first increases and then decreases. Solid particles with relatively high concentration and large particle size appear on the outside of the first half of the elbow. In the vertical pipe, the hydrate concentration and particle size gradually increase again, and the hydrate with high concentration and large particle size appears on the inside. Besides, the coupling aggregation of hydrate and sand particles is concentrated near the wall of the bottom of the horizontal pipe, near the wall of the outside of the elbow pipe and the inside of the second half of the elbow, and near the wall of the vertical pipe. The high flow velocity has a great ability to carry the hydrate with high concentration and large size.