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| 1 | Evaluating the blank contamination and recovery of sample pretreatment procedures for analyzing organophosphorus flame retardants in waters显示文摘Organophosphate esters(OPEs), used as flame retardants and plasticizers, are widely present in environmental waters. Development of accurate determination methods for trace OPEs in water is urgent for understanding the fate and risk of this class of emerging pollutants. However, the wide use of OPEs in experimental materials results in blank interference, which influences the accuracy of analytical results. In the present work, blank contamination and recovery of pretreatment procedures for analysis of OPEs in water samples were systematically examined for the first time. Blank contaminations were observed in filtration membranes, glass bottles, solid phase extraction cartridges, and nitrogen blowing instruments. These contaminations could be as high as 6.4–64 ng/L per treatment. Different kinds of membranes were compared in terms of contamination levels left after common glassware cleaning, and a special wash procedure was proposed to eliminate the contamination from membranes. Meanwhile, adsorption of highly hydrophobic OPEs on the inside wall of glass bottles was found to be 42.4%–86.1%, which was the primary cause of low recoveries and was significantly reduced by an additional washing step with acetonitrile. This work is expected to provide guidelines for the establishment of analysis methods for OPEs in aqueous samples. | Kang Liang Yumin Niu Yongguang Yin Jingfu Liu | 2015 | Journal of Environmental Sciences2015，27，8： | 3 |
| 2 | Simultaneous determination of bisphenol A and alkylphenol in plant oil by gel permeation chromatography and isotopic dilution liquid chromatography-tandem mass spectrometry 显示文摘 | NIU Yumin ZHANG Jing WU Yongning | 2011 | Journal of Chromatography A2011，1218，31： | 1 |
| 3 | Efficiency enhancement in dye-sensitized solar cells by interfacial modification of conducting glass/mesoporous TiO 2 using a novel ZnO compact blocking film显示文摘 | Yumin Liu Xiaohua Sun Qidong Tai Hao Hu Bolei Chen Niu Huang Bobby Sebo Xing-zhong Zhao | 2010 | Journal of Power Sources2010，，1： | 1 |
| 4 | Products of methotrexate during chlorination显示文摘Methotrexate(MTX)is a cytotoxic drug widely used in the treatment of tumors,autoimmune diseases and severe asthma. jen00883 This drug has been frequently detected in the aquatic environment with concentrations up to μg/L levels. The MTX present in environmental water might be transformed and removed during chlorination disinfection treatment. In this work,the fate of MTX during aqueous chlorination was investigated in laboratory batch experiments,and the transformation products of MTX were identified. Aqueous solutions of MTX(1 mg/L)were chlorinated by sodium hypochlorite solution at room temperature under neutral p H conditions. Chlorinated products were pre-concentrated with solid-phase extraction(SPE)cartridges and determined by liquid chromatography electrospray ionization tandem mass spectrometry(LC–ESI–MS/MS). The reaction of MTX chlorination exhibited pseudo-first-order kinetics and the half-life time of MTX degradation was calculated to be 1.65 min,when the initial chlorine concentration was 2 mg/L. Two chlorinated MTX congeners,4-amino-3-chlorinated-N10-methylpteroylglutamic(monochloro-MTX)and 4-amino-3,5-dichloro-N10-methylpteroylglutamic(dichloro-MTX)were found in the chlorinated solution. Monochloro-MTX was successfully fractionated by high performance liquid chromatography(HPLC)and its structure was further identified using ~1H nuclear magnetic resonance(NMR)analysis. The presence of the two products in real hospital wastewater was then examined and both compounds were detected. Finally,the effects of MTX and monochloro-MTX on the cell cycle progression in vitro were evaluated using zebrafish liver cell line. It was found that both compounds could inhibit the proliferation of zebrafish liver cells through S phase arrest and their effects on the cell cycle profile had no significant difference. | Jie Yin Yumin Niu Bing Shao | 2017 | Journal of Environmental Sciences2017，29，5： | 1 |
| 5 | A Fault-Tolerant Mobility-Aware Caching Method in Edge Computing显示文摘Mobile Edge Computing(MEC)is a technology designed for the on-demand provisioning of computing and storage services,strategically positioned close to users.In the MEC environment,frequently accessed content can be deployed and cached on edge servers to optimize the efficiency of content delivery,ultimately enhancing the quality of the user experience.However,due to the typical placement of edge devices and nodes at the network’s periphery,these components may face various potential fault tolerance challenges,including network instability,device failures,and resource constraints.Considering the dynamic nature ofMEC,making high-quality content caching decisions for real-time mobile applications,especially those sensitive to latency,by effectively utilizing mobility information,continues to be a significant challenge.In response to this challenge,this paper introduces FT-MAACC,a mobility-aware caching solution grounded in multi-agent deep reinforcement learning and equipped with fault tolerance mechanisms.This approach comprehensively integrates content adaptivity algorithms to evaluate the priority of highly user-adaptive cached content.Furthermore,it relies on collaborative caching strategies based onmulti-agent deep reinforcement learningmodels and establishes a fault-tolerancemodel to ensure the system’s reliability,availability,and persistence.Empirical results unequivocally demonstrate that FTMAACC outperforms its peer methods in cache hit rates and transmission latency. | Yong Ma Han Zhao Kunyin Guo Yunni Xia Xu Wang Xianhua Niu Dongge Zhu Yumin Dong | 2024 | Computer Modeling in Engineering & Sciences2024，140，7： | 0 |
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