Synthesis of g-C3N4/diatomite/MnO2 composites and their enhanced photo-catalytic activity driven by visible light

Chen Ran-Ran,Ren Qi-Fang,Liu Yu-Xin,Ding Yi,Zhu Hai-Tao,Xiong Chun-Yu,Jin Zhen,오원춘 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.5

Herein, a novel visible-light-responsive g-C 3 N 4 /diatomite/MnO 2 composite was successfully fabricated through a simple redox reaction method. The structure and morphology of the sample are mainly characterized by X-ray diff raction (XRD), photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmis- sion electron microscopy (TEM), and ultraviolet–visible spectroscopy (UV–Vis). In this paper, the photo-catalytic activity of the sample was evaluated by degradation RhB under visible-light irradiation. The results shown that, compared with g-C 3 N 4 /diatomite composite, MnO 2 , g-C 3 N 4 , diatomite, the prepared g-C 3 N 4 /diatomite/2.5%MnO 2 composite exhibits bet- ter photo-catalytic activity and stability. At the same time, the eff ect of diff erent MnO 2 additions on the photo-catalytic activity of the composite material was further analyzed. The results indicated that the g-C 3 N 4 /MnO 2 /diatomite composites exhibit highest photo-catalytic activity when the adding amount of MnO 2 reached 2.5%. The degradation rate of the g-C 3 N 4 / diatomite/2.5%MnO 2 is 93% after recycling for three times, showing good stability and reusability. Moreover, the mechanism of catalytic performance enhancement also has been discussed.

The New Strategy of Object-Based Directional Query

Run-tao liu,Yan-ming Wang,Zhen-guo Zhao,Guang -Yue Tian 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6

To increase directional query efficiency, based on the study of existing algorithms of directional query, new pruning rules for directional query were given, combined with the new index structure MB-tree. The rules exclude the MBRs outside the query area and output all leaf nodes in the MBRs inside the query area. Based on the orders defined in MB-tree, a new algorithm of directional query is given combining with MB-tree by using recursive method, and the new algorithm can reduce I/O cost effectively. Experiment showed that the new directional query algorithm reduces the number of visited nodes, decreases I/O cost, and improves the efficiency of directional query.

Bacterial and Fungal Diversity in the Starter Production Process of Fen Liquor, a Traditional Chinese Liquor

Xiao-Ran Li,En-Bo Ma,Liang-Zhen Yan,Han Meng,Xiao-Wei Du,Zhe-Xue Quan 한국미생물학회 2013 The journal of microbiology Vol.51 No.4

Fermented foods and beverages are important parts of human diet. Fen liquor, a Chinese liquor is a fermented beverage that uses a traditional fermentation process. Starters are the main microbial source and also provide nutrients for microorganisms during fermentation. In this study, starters of Fen liquor were produced through a complex traditional fermentation process. To investigate the community structure and the composition of microorganisms in the starter production process, bacterial 16S rRNA and fungal internal transcribed spacer (ITS) regions were sequenced using clone libraries and pyrosequencing, respectively. There was much higher diversity among the bacteria than among the fungi in the starter production process. Bacteria on the surface of the starters belonged mostly to the Lactobacillaceae family,while members of the Bacillacae family were dominant in the interior of the samples that lacked access to air and water. In the fungi population, diversity was high only in the raw material. In all other samples, nearly all of the fungal sequences were from Pichia kudriavzevii, a member of the Saccharomycetaceae family. Nearly all samples showed similar fungal community structures, indicating that there was little change in the fungal community. To the best of our knowledge, this is the first report to reveal the whole process of the starter production of Chinese traditional liquor. The findings obtained in this study provide new insights into understanding the composition of the microbial community during the traditional Chinese liquor starter production process and information about the production process control and monitoring.

A Novel Non-phosgene Approach to the Synthesis of Methyl N-phenyl Carbamate by a Reaction of Methanol with Phenylurea

Shi-run Yan,Xin-kui Wang,Zhen-hua Li,Kang-nian Fan,Mao-qing Kang,Shao-yi Peng 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2

A novel non-phosgene process for the synthesis of methyl N-phenyl carbamate (MPC) by a reaction of phenylurea with methanol was studied. The reaction between phenylurea and methanol was found to be a spontaneous reaction that took place in the absence of catalyst and gave MPC as the main product. Addition of a catalyst markedly influenced the reaction behavior. A basic catalyst greatly enhanced the yield of MPC, whereas an acidic catalyst promoted the formation of aniline and methyl carbamate. Moderate strength of basicity showed the best catalytic performance in the cases studied. The mechanism of reaction and catalyst functioning was discussed.

World Health Organization survey on the level of integration of traditional Chinese medicine in Chinese health system rehabilitation services

Lei Fang,Ran-ran Zhu,Zhen Sang,Xiao-ting Xu,Lin-yun Zheng,Yanwei Xiang,Chaoyang Guo,Zhenrui Li,Stephane Alexandre Espinosa,Qi Zhang,Chunlei Shan 한국한의학연구원 2023 Integrative Medicine Research Vol.12 No.2

Background: To meet the growing global demand for rehabilitation services, the World Health Organization (WHO) launched Rehabilitation 2030. This study was commissioned by the WHO to investigate the integration degree of traditional Chinese medicine (TCM) in Chinese health system rehabilitation services and the demand for TCM rehabilitation in China. Methods: Twenty TCM rehabilitation experts and relevant government administrators were invited to complete the questionnaire between September 2019 and January 2022. The development of traditional, complementary, and integrative medicine (TCI) rehabilitation in China was assessed primarily based on six different health system components. Results: 26 policies, regulations, and national strategic plans related to TCI rehabilitation were issued by relevant government departments since 2002; notably, 14 policies related to TCI rehabilitation development were intensively introduced from 2016 to 2021. These policies cover the three main areas of financing, infrastructure development, and service delivery. The National Administration of Traditional Chinese Medicine's investment in TCM clinical capacity infrastructure and scientific research in 2019–2021 increased by 66% compared to 2010–2012, and the average number of TCM hospitals with rehabilitation departments in 2020 increased by 6.5% compared to 2018. The proportion of community health service centers providing TCM services in primary medical and health institutions has increased by 30.8% over the past 10 years. Conclusion: Long-term continuous policies, substantial financial investment, and expansion of the scope of TCI rehabilitation services in primary care institutions have effectively contributed to the rapid development of TCI rehabilitation. However, human resources and financing mechanisms for TCI rehabilitation need further improvement.

Seismic Response of Two Site Models and Their Effects on the Railway Cable-Stayed Bridge

Jin Zhang,Zhen-yu Yang,Da-ping Yuan,Shi-xiong Zheng,Yi-ran Hu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.12

In order to accurately analyze the seismic response of the site and their effects on a railway cable-stayed bridge, the site condition of the railway cable-stayed bridge was surveyed, and geotechnical exploration holes ZK1 and ZK2 were set near the left and right tower of the bridge to gain the detailed geological data, then 32 representative ground motions records were selected corresponding to the site characteristics, and the equivalent linear and nonlinear model were established to analyze the site seismic response of 32 representative ground motions based on the Deepsoil Software. Next, to investigate the influence of site seismic response on the long-span railway cable-stayed bridge, the seismic response of the cable-stayed bridge considering site effect are calculated and evaluated via time history analysis under one-dimensional and multi-point excitation based on the ANSYS platform. At last, several critical and meaningful conclusions are drawn.

The Numerical Study of the Air Lubrication on the Hull Bottom of the Ship

Hu Shi-liang,Zhen An-ran,Sun Wen-yu,Yang Li,Wei Jin-fang 한국전산유체공학회 2022 한국전산유체공학회 학술대회논문집 Vol.2022 No.10

Prevalence, Risk Factors, and Psychological Effects of Primary Nocturnal Enuresis in Chinese Young Adults

Hui Jie Hu,Zhen Wei Zhang,Yu Liang,Yan Yan Luo,Qi Feng Dou,Cui Ping Song,Hui Min Zhang,Ying Zhao,Guang Run Tian,Ke Zhang,Qiu Fang Mao,Jing Gui Song,Soren Rittig,Jian Guo Wen 대한배뇨장애요실금학회 2021 International Neurourology Journal Vol.25 No.1

Purpose: This study aimed to investigate the prevalence, risk factors, and effects of primary nocturnal enuresis (PNE) on physical and mental health in young adults in mainland China. Methods: An anonymous questionnaire was used to collect information including the sociodemographic characteristics, history of PNE, family history, daytime voiding symptoms, Pittsburgh Sleep Quality Index (PSQI) scores, Self-Esteem Scale (SES), and Self-Rating Depression Scale (SDS). A total of 22,500 university students from 23 provinces and 368 cities in mainland China were included. Results: In total, 21,082 questionnaires were collected, and 20,345 of them qualified for statistical analysis. The PNE prevalence was 1.17%, and the distribution of monosymptomatic nocturnal enuresis (MNE) and nonmonosymptomatic nocturnal enuresis (NMNE) was 66.1% and 33.9%, respectively. In total, 28% of respondents with PNE reported bedwetting daily, 31.6% between 1 and 7 times weekly, and 40.4% between 1 and 4 times monthly; 80% of PNE cases had no history of treatment. The prevalence of PNE in patients with a family history, frequency, urgency, urinary incontinence, and recurrent urinary tract infections was significantly higher than in those without these conditions (P<0.001). PNE was significantly correlated with the PSQI total score (sleep quality) (P=0.011). The SES score was lower and the SDS was higher (P<0.001) in the PNE group than in those without PNE. Conclusions: In mainland China, the PNE prevalence among young adults was found to be high, and PNE had significant effects on physical and mental health. Risk factors included a family history, daytime voiding symptoms, and lack of treatment.

Identification and Characterization of an Anti-fungi Fusarium oxysporum f. sp. cucumerium Protease from the Bacillus subtilis Strain N7

Yi Luo,Lifei Sun,Zhen Zhu,Wei Ran,Qirong Shen 한국미생물학회 2013 The journal of microbiology Vol.51 No.3

A newly discovered alkaline antifungal protease named P6 from Bacillus subtilis N7 was purified and partially characterized. B. subtilis N7 culture filtrates were purified by 30–60% (NH4)2SO4 precipitation, anion-exchange chromatography and gel filtration chromatography. Sodium dodecyl sulfatepolyacrylamide gel electrophoresis (SDS-PAGE) revealed a single band of 41.38 kDa. Peptide sequence of protease P6 was determined using a 4800 Plus MALDI TOF/TOFTM Analyzer System. Self-Formed Adaptor PCR (SEFA-PCR) was used to amplify the 1,149 bp open read frame of P6. Dimensional structure prediction using Automatic Modeling Mode software showed that the protease P6 consisted of two β-barrel domains. Purified P6 strongly inhibited spore and mycelium growth of Fusarium oxysporum f. sp. cucumerium (FOC) by causing hypha lysis when the concentration was 25 μg/ml. Characterization of the purified protease indicated that it had substrate specificity for gelatin and was highly active at pH 8.0–10.6 and 70°C. The P6 protease was inhibited by EDTA (2 mmol/L), phenyl methyl sulfonyl fluoride (PMSF, 1 mmol/L), Na+, Fe3+, Cu2+, Mg2+ (5 mmol/L each) and H2O2 (2%, v/v). However, protease activity was activated by Ca2+, K+, Mn2+ (5 mmol/L each), mercaptoethanol (2%, v/v) and Tween 80 (1%, v/v). In additon, activity was also affected by organic solvents such as acetone, normal butanol and ethanol, but not hexane (25%, v/v each).

Highly heat-resistant NF membrane modified by quinoxaline diamines for Li+ extraction from the brine

Huan-Yin Xie,Run-Hua Tang,Gui-E Chen,Zhen-Liang Xu,Haifang Mao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

The Functional layers with excellent heat-resistence nanofiltration (HRN) property were designed by fixingthermal stabilized quinoxaline diamines (QHDA) on poly (m-phenyleneisophthalamide) (PMIA) substratethrough interfacial polymerization. QHDA was used as aqueous monomer while cinnamoylchloride (CNC), isophthaloyl chloride (IPC) and trimesoyl chloride (TMC) were served as organic monomersto realize the immobilization of thermally stable N heterocycles. The experimental results statedclearly that the compact package reaction of QHDA with TMC lead a raise of thermal stability and saltsrejection at high temperature stream. With the optimal TMC and 0.5 wt.% QHDA, the as-developed membraneachieved the excellent NF performance and thermal stability. The rejection of MgSO4 reached to94.6 % at 30 C and hardly decrease at 90 C. The reduction in rejection was satisfactory at high temperatures. The functional layer still showed highly stability after 10 h long-term operation at 90 C with only2.8 % reduction in MgSO4 rejection. Besides, the excellent Mg2+ and poor Li+ rejection made this membranehave huge potential in the application of extracting Li+ from brine. The separation factor ofMg2+-Li+ at high temperature was satisfactory. Over all, this study offered a prospect technology toexploit heat-resistant membranes for extraction lithium at high temperature.