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| 1 | Controlled preparation and characterization of nano-sized hexagonal Mg(OH)_2 flame retardant显示文摘Nano-sized hexagonal magnesium hydroxide(Mg(OH)_2) with good dispersibility was synthesized by a double injection-hydrothermal method,utilizing polyvinylpyrrolidone(PVP) as an additive and with optimized processing parameters.SEM and BET analysis showed that the mean particle size and specific surface area of the Mg(OH)_2 particles were 174 nm and 50.77 m^2/g,respectively.The FT-IR spectra and the XRD patterns showed that PVP was adsorbed on the surface of the Mg(OH)_2 crystal,thus effectively limiting particle agglomeration and hindering crystal growth along the(101) plane.TGA showed a decrease in the decomposition temperature and an increase in the weight loss of the Mg(OH)_2 particles due to addition of PVP. | Huaxiong Fang Tao Zhou Xiangping Chen Simin Li Guangshan Shen Xiaoyan Liao | 2014 | Particuology2014，12，3： | 10 |
| 2 | Product substitution and dual sourcing under random supply failures显示文摘 | Mengshi Lu Simin Huang Zuo-Jun Max Shen | 2010 | Transportation Research Part B2010，，8： | 1 |
| 3 | A systematic methodology for constructing hyperchaotic systems with multiple positive Lyapunov exponents and circuit implementation显示文摘 | SHEN Chaowen YU Simin L~ Jinhu | 2014 | IEEE Transactions on Circuits and Systems-I: Regular Papers2014，61，3： | 1 |
| 4 | Designing hyperchaotic systems with any desired number of positive Lyapunov exponents via a simple model显示文摘 | SHEN Chaowen YU Simin LU Jinhu | 2014 | IEEE Transactions on Circuits and Systems-I: Regular Papers2014，61，8： | 1 |
| 5 | Constructing hyperchaotic systems at will显示文摘 | SHEN Chaowen YU Simin LU Jinhu | 2015 | International Journal of Circuit Theory and Applications2015，43，12： | 1 |
| 6 | Factors Associated with SARS-CoV-2 Repeat Positivity—Beijing,China,June–September 2020显示文摘Introduction:Repeat positive severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)following COVID-19 initial viral clearance(repositivity)poses a public health management challenge.The objective was to determine factors associated with neutralizing antibody(Nab)level and re-positivity among patients infected with a single strain SARS-CoV-2.Methods:During a single strain SARS-CoV-2 cluster in Beijing,China,longitudinal individual clinical,virological,and immunological data were collected from 368 infections from June 13 to September 22,2020.Factors associated with Nab level and re-positivity were analyzed using generalized estimating equations.Results:A total of 353(96%)SARS-CoV-2 infections had demographic,clinical,and laboratory data available.Among the 353 infections,55(15.5%)were re-positive,and blood draws were taken from 346 individuals(98.0%)during hospitalization and/or during the follow-up period.Symptoms were milder for the second-time admission for the re-positives,although 36.4%of re-positives presented with radiographic appearance of pneumonia manifestation.Compared to non-re-positive patients,NAb titers were lower among re-positives;NAb was positively associated with clinical severity.Samples from the lower respiratory tract manifested higher viral load than that from the upper respiratory tract.Multivariable analysis showed re-positivity was positively associated with being female[odd ratio(OR)=1.7,95%confidence interval(CI)1.1–2.8]and being aged<18 years(OR=5.2,95%CI 1.5–18.1);having initially asymptomatic infection(OR=13.7,95%CI 1.6–116.3);and negatively associated with a higher NAb level(OR=0.9,95%CI 0.5–1.7).Conclusions:NAb may be important for sustained viral clearance.Lower respiratory tract infection was associated with higher viral load among all infections when compared to upper respiratory tract infection.Continuous lower respiratory and intermittent upper respiratory viral shedding among COVID-19 infections may occur. | Siqi Li Xiaoli Wang Li Li Yang Pan Siyuan Yang Dawei Tan Ying Shen Peng Yang Naor Bar-Zeev Yaling Hu Jacky MJennings Simin Li Linghang Wang Quanyi Wang | 2022 | China CDC weekly2022，4，5： | 1 |
| 7 | Vital Surveillances: Factors Associated with SARS-CoV-2 Repeat Positivity-Beijing, China, June-September 2020显示文摘全球各地陆续出现新冠患者康复后再次核酸阳性的情况,引发了行业内的关注。先前有关复阳的研究均来自于不同的传播链,感染者感染的毒株不尽相同。为减少不同毒株而引发的复阳的选择偏倚,有必要对感染同一毒株的新冠患者的复阳情况进行研究。中和抗体水平被认为在清除新冠病毒中发挥重要作用,被用于治疗新冠患者。本研究纳入人口学、临床、实验室数据及重复测量中和抗体和病毒载量,分析了影响新冠患者复阳的因素。结果显示,353个病例中,约15%患者康复后复阳,这一结果与大部分有关复阳的研究结果相符。使用多因素广义估计模型对复阳进行分析发现,复阳和患者中和抗体水平成负相关,即抗体水平低,复阳的可能性更大。提示可能因抗体水平低,不足以完全清除病毒而导致复阳。 | Siqi Li Xiaoli Wang Li Li Yang Pan Siyuan Yang Dawei Tan Ying Shen Peng Yang Naor Bar-Zeev Yaling Hu Jacky MJennings Simin Li Linghang Wang Quanyi Wang 李思麒 | 2022 | 中华实验和临床病毒学杂志2022，36，1： | 0 |
| 8 | Effects of stress loading mode on microstructures and properties of Mg-9Gd-2Nd-0.5Zr alloy treated by creep aging显示文摘Creep aging forming(CAF) is a potential process used to manufacture large integral components of magnesium(Mg) alloys. The selected stress plays a crucial role in creep aging processes but the mechanism by which stress loading method affects creep aging of Mg alloys is still unclear. In this paper, the microstructural evolution of precipitated phases and precipitation-free zones(PFZ) at grain boundaries with different stress loading modes(unstressed, unidirectional tensile stress, and cyclic stress) at 250 ℃ were investigated along with changes in mechanical properties. The results showed that the addition of stress during aging effectively promoted the precipitation of precipitated phases, while unaffecting grain size. Unidirectional tensile stress caused directional growth of β phase([1010]), as well as rotation of weave towards the basal plane texture, resulting in namely stress orientation effect. Solute atoms diffused in the direction of tensile stress while vacancies moved perpendicular to the direction of tensile stress, resulting in PFZ at grain boundaries(157.06 nm). By contrast, cyclic stresses led to the growth of β phase in three directions([1010], [1100] and [0110]). The solute atoms and vacancies were uniformly distributed in the Mg matrix instead of directional diffusion, effectively reducing the width of PFZ(112.39 nm) at the grain boundary. These features significantly improved the mechanical properties of alloy specimens after cyclic stress creep aging when compared to unidirectional stress creep aging, with yield strength(YS), ultimate tensile strength(UTS), and elongation(EL) enhanced from 171.6 MPa, 305.5 MPa, and 4.4%to 174.8 MPa, 326.3 MPa, and 6.9%, respectively. | Simin Shen Yongpeng Zhuang Ming Li Hongxia Wang Lifei Wang Weili Cheng Hang Li Hua Hou Kwangseon Shin | 2023 | Journal of Magnesium and Alloys2023，11，11： | 0 |
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