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Jun Feng Su,Ruijie Zhang,Xiaofen Hu,Amjad Ali,Zhao Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
Calcium precipitation induced by Acinetobacter sp. H12 can simultaneously remove F− and Ca2+. Adsorption kinetics and isotherm studies showed that the defluoridation effect improved with the increase of temperature and time. The equilibrium adsorption capacity of calcium precipitation was 7.43 mg g−1 at the initial F− concentration of 10 mg L−1. Moreover, as the pH increased, the F− adsorption capacity decreased and the Ca2+ removal rate gradually increased. The adsorption process was highly fitted to the pseudo-second-order and the Freundlich isotherm. Adsorption thermodynamics analysis demonstrated that the adsorption process was a spontaneous endothermic reaction. The activation adsorption energy was 2.81 kJ mol−1 and the frequency coefficient was 10.88 h−1. EEM, SEM, XPS. XRD results indicated that the defluoridation mechanism may be due to adsorption and co-precipitation. The mechanism of Ca2+ removal may be co-precipitation with F−. It is worth-mentioning that calcium precipitation overcame the problem of adding carbon sources and avoided the microbial safety risk in the effluent. Therefore, a new insight was proposed for simultaneous remediation of Ca2+ and F− from groundwater combining the biological and chemical method.
Jun Feng Su,Shu Yang,Ting Lin Huang,Xue Chen Bai,Jin Suo Lu,Lei He,Min Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
We studied the mechanism for the simultaneous removal of nitrate and Ni(II) by Enterobacter sp. CC76. Response surface methodology results showed that the maximum removal ratios of nitrate and Ni(II) were 95.02% and 75.99% under the following conditions: pH 7.37, 54.31mg·L1 Fe(II), and 10.00mg·L1 Ni(II). The mechanism of Ni(II) removal involved Fe-oxide adsorption and the increase of pH. In addition, meteorological chromatography analysis indicated that Ni(II) affected gas composition during denitrification. Scanning electron microscopy and X-ray photoelectron spectroscopy confirmed that Fe-oxide adsorption was the main contributor to Ni(II) removal. This study shows that Enterobacter sp. CC76 can enhance the adsorption of Ni(II) onto Fe-oxides while removing nitrate.
Jun-Ning Zhang,Qun-Xing Su,Peng-Yuan Liu,Hong-Yu Ge,Ze-Feng Zhang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.10
We take formulate structure from motion as a learning problem, and propose an end-to-end learning framework to calculate the image depth, optical flow, and the camera motion. This framework is composed of multiple encoder-ecoder networks. The key part of the network structure is the FlowNet, which can improve the accuracy of the estimated camera ego-motion and depth. As with recent studies, we use an end-to-end learning approach with multi-view synthesis as a variety of supervision, and proposes multi-view consistency losses to constrain both depth and camera ego-motion, requiring only monocular video sequences for training. Compared to the recently popular depth-estimation-networks using a single image, our network learns to use motion parallax correction depth. Although MuDeepNet training requires the use of two adjacent frames to obtain motion parallax, it is tested by using a single image. Thus, MuDeepNet is a monocular system. The experiments on KITTI dataset show our MuDeepNet outperforms other methods.
Xiang-Feng Wu,Yi-Jin Wang,Zuo-Lin Cao,Yan-Mei Feng,Hui Li,Chen-Xu Zhang,Jun-Zhang Su,Jia-Rui Zhang,Yi-Wei Wang,Kai-Yuan Wang,Guo-Wen Sun 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.7
The novel AgCl/Ag2SO3 hybrids as an efficient photocatalyst had been fabricated by an in situ synthetic method. The correlations between the structure and the photocatalytic properties of the as-fabricated hybrids were analyzed. Experimental results exhibited that with increasing the amount of Ag2SO3, the degradation rate of the as-obtained samples was firstly increased and then decreased under the visible light irradiation. When the mass ratio of AgCl to Ag2SO3 was 1:2, in 30?min, it displayed the highest degradation rate of 99.2% for rhodamine-B, which was obviously higher than 46.1, 60.5, and 14.6% of pure AgCl, Ag2SO3, and TiO2 (P25), respectively. Similar results could be found in degradation of methyl orange. It had the maximum of 97.4% in 90?min, which was higher than 55.2, 48.7, and 12.7% of pure AgCl, Ag2SO3, and P25, respectively. Moreover, the as-prepared hybrids possessed the enhanced separation and transfer of photo-generated electron?hole pairs compared to the pure samples. In addition, the holes and superoxide radicals played the dominant role and the hydroxyl radicals played the secondary role during the process of photocatalytic degradation.
Minimization of Surface Roughness and Machining Deformation in Milling of Al Alloy Thin-Walled Parts
De-Jun Cheng,Feng Xu,Sheng-Hao Xu,Chun-Yan Zhang,Sheng-Wen Zhang,Su-Jin Kim 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.9
This study focused on investigating the surface roughness in the feed direction (R a -Fd), surface roughness in the transversedirection (R a -Td), and thin-walled parts deformation (TWD) during milling of Al alloy 5083. The response surface method(RSM) was used to conduct experiments and establish the models of R a -Fd , R a -Td , and TWD under various cutting parameters. The significance of cutting parameters on R a -Fd , R a -Td , and TWD was analyzed by analysis of variance. It was observedthat the R a -Fd and R a -Td are mainly influenced by the spindle speed, depth of cut, transverse size and feed rate, while the TWD is mainly influenced by the depth of cut. A comparison of RSM-optimum function and artificial bee colony (ABC)algorithm optimum programming was conducted to obtain the best cutting conditions leading to minimum R a -Fd, R a -Td and TWD simultaneously. From the presented results, ABC algorithm was able to obtain the better cutting strategy. Finally, theperformance of the proposed cutting strategy was verified by confirmation experiments.
The Current Status, Trend, and Influencing Factors to Malnutrition of Infants and Children in China
Zhai, Feng-Ying,Wang, Hui-Jun,Chang, Su-Ying,Fu, Dawei,Ge, Keyou,Popkin, Barry M. The Korean Society of Community Nutrition 2004 Journal of community nutrition Vol.6 No.2
Children are the most nutrition sensitive sub-group of a population. The nutritional status of children should be especially emphasized at all levels. This study was performed to investigate the current status, trend, and influencing factors to malnutrition of infants and children in China. The study was mainly based on the China Health and Nutrition Survey which is a longitudinal study conducted in 8 provinces and the data on growth of children under 7 years of age in 9 cities in China. The result of this study showed that one fifth of the children under 5 years of age are still suffering from stunted growth and one tenth suffering from underweight. The nutrition intervention on children under 2 years of age, especially on those under 18 months should be emphasized. Better supplementary food can improve the nutritional status to decrease the prevalence of stunted children. Therefore, the development of supplementary food should be the priority and should be emphasized with breastfeeding.
녕효봉(Xiao Feng Ning),리혁(He Li),강태환(Tae Hwan Kang),이준수(Jun Soo Lee),이정현(Jeong Hyun Lee),한충수(Chung Su Han) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.6
본 연구에서는 원적외선 이용하여 단풍취를 박층 건조할 경우 건조온도와 송풍속도에 따른 건조특성과 건조제품의 색도 변화를 조사하였고, 건조 전후 취나물의 항산화 성분과 항산화력 변화를 분석함으로써 고품질의 원적외선 건조 취나물 제품 생산을 위한 기초 자료를 제시하고자 하였다. 단풍취의 건조속도는 원적외선 박층 건조온도와 송풍속도가 증가할수록 빨라지고, 건조시간이 단축되는 것으로 나타났다. 특히 원적외선 박층 건조온도 50°C의 송풍속도 0.8 m/sec에서 건조속도가 가장 빠른 것으로 나타났다. 본 연구에서 검증한 건조모델 중 Thompson 모델은 결정계수가 0.9826 이상, RMSE는 0.1277 이하로 나타나, Lewis, Page, Henderson 모델보다 단풍취의 원적외선 박층 건조 시 함수율비 예측 정밀도가 높은 것으로 나타났다. 원적외선 박층 건조 후 단풍취의 ΔL(명도)값은 원적외선 건조온도와 송풍 속도가 빠를수록 증가하는 경향을 보였고, Δa(적색도/녹색도)와 Δb(황색도) 값은 원적외선 건조온도가 낮고, 송풍속도가 느릴수록 갈변하는 현상이 심화되는 것으로 나타났다. 원적외선 박층 건조 후 단풍취의 ΔE(색차)값도 원적외선 건조온도가 낮고, 송풍속도가 느릴수록 증가하는 경향을 보였다. 항산화 성분인 폴리페놀 함량의 경우 원적외선 건조온도가 높을수록 감소량이 증가하였고 원적외선 박층 건조 후 37.36~55.21% 감소하는 경향을 보였으며, 원적외선 박층 건조조건 중 원적외선 건조온도 40°C의 송풍속도 0.8 m/sec와 45°C의 송풍속도 0.6 m/sec 조건에서 감소율이 낮은 것으로 나타났다. 플라보노이드 함량의 경우에도 원적외선 박층 건조 후 32.24~44.18% 감소하는 것으로 나타났고, 원적외선 건조온도 40°C의 송풍속도 0.8 m/sec와 45°C의 송풍속도 0.8 m/sec 조건에서 감소율이 낮은 것으로 나타났다. 항산화력의 경우에도 원적외선 건조온도가 높을수록 감소하는 경향을 보였고, 원적외선 건조조건 중 40°C의 송풍속도 0.8 m/sec와 45°C의 송풍속도 0.6 m/sec 조건에서 항산화력 감소율이 다른 건조조건보다 낮은 것으로 나타났다. 따라서 단풍취의 건조시간, 건조 중 변색, 항산화 성분 및 항산화력 등을 고려하면 단풍취 건조제품의 고품질화를 위해서는 원적외선 박층 건조온도 45°C의 송풍속도 0.6, 0.8 m/sec가 적절한 건조조건으로 판단된다. The purpose of this study was to investigate the drying characteristics and drying models of Ainsliaea acerifolia Sch. Bip. using far-infrared thin layer drying. Far-infrared thin layer drying test on Ainsliaea acerifolia Sch. Bip. was conducted at two air velocities of 0.6 and 0.8 m/sec, as well as three drying temperatures of 40, 45, and 50°C respectively. The drying models were estimated using coefficient of determination and root mean square error. Drying characteristics were analyzed based on factors such as drying rate, leaf color changes, antioxidant activity, and contents of polyphenolics and flavonoids. The results revealed that increases in drying temperature and air velocity caused a reduction in drying time. The Thompson model was considered suitable for thin layer drying using far-infrared radiation for Ainsliaea accerifolia Sch. Bip. Greenness and yellowness values decreased and lightness values increased after far-infrared thin layer drying, and the color difference (ΔE) values at 40°C were higher than those at 45°C and 50°C. The antioxidant properties of Ainsliaea acerifolia Sch. Bip. decreased under all far-infrared thin layer drying conditions, and the highest polyphenolic content (37.9 mg/g), flavonoid content (22.7 mg/g), DPPH radical scavenging activity (32.5), and ABTS radical scavenging activity (31.1) were observed at a drying temperature of 40°C with an air velocity of 0.8 m/sec.