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| 1 | A study of peroxyacetyl nitrate at a rural site in Beijing based on continuous observations from 2015 to 2019 and the WRFChem model显示文摘Peroxyacetyl nitrate(PA N)is one of the most important photochemical pollutants and has aroused much concern in China in recent decades.However,few studies described the long-term variations in PAN in China.In this study,we continuously monitored the PAN,03 and NOx concentrations at a regional background site near Beijing from August 2015 to February 2019.Based on the observed concentrations and climate data,w e analyzed the seasonal PAN variations.The results revealed that the monthly mean PAN concentration ranged from 0.33-2.41 ppb,with an average value of 0.94 ppb.The PAN concentration exhibited a distinct seasonal variation,with high values in spring and low values in winter.After analyzing the corresponding meteorological data,we found that stronger ultraviolet(UV)radiation,a relatively longer lifetime and a higher background PAN concentration contributed to the high PAN concentrations in spring.In addition,with the utilization of the WRF-Chem(Weather Research and Forecasting with Chemistry)model,the cause of the extremely high PAN concentration in spring 2018 wa s determined.The model results demonstrated that an anomalously low pressure and the southwesterly winds in northern China might be the main causes of the increased PAN concentration in Beijing and its surrounding area in spring 2018. | Yulu Qiu Zhiqiang Ma Weili Lin Weijun Quan Weiwei Pu Yingruo Li Liyan Zhou Qingfeng Shi | 2020 | Frontiers of Environmental Science & Engineering2020，14，4： | 3 |
| 2 | Asymptotic solutions of the flow of a Johnson-Segalman fluid through a slowly varying pipe using double perturbation strategy显示文摘A double perturbation strategy is presented to solve the asymptotic solutions of a Johnson-Segalman(J-S) fluid through a slowly varying pipe. First, a small parameter of the slowly varying angle is taken as the small perturbation parameter, and then the second-order asymptotic solution of the flow of a Newtonian fluid through a slowly varying pipe is obtained in the first perturbation strategy. Second, the viscoelastic parameter is selected as the small perturbation parameter in the second perturbation strategy to solve the asymptotic solution of the flow of a J-S fluid through a slowly varying pipe. Finally,the parameter effects, including the axial distance, the slowly varying angle, and the Reynolds number, on the velocity distributions are analyzed. The results show that the increases in both the axial distance and the slowly varying angle make the axial velocity slow down. However, the radial velocity increases with the slowly varying angle, and decreases with the axial distance. There are two special positions in the distribution curves of the axial velocity and the radial velocity with different Reynolds numbers, and there are different trends on both sides of the special positions. The double perturbation strategy is applicable to such problems with the flow of a non-Newtonian fluid through a slowly varying pipe. | Xinyin ZOU Xiang QIU Jianping LUO Jiahua LI P.N.KALONI Yulu LIU | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，2： | 1 |
| 3 | Real-life effectiveness and safety of secukinumab in axial spondyloarthritis:a single-center study显示文摘To the Editor:Axial spondyloarthritis(axSpA)is a chronic inflammatory disease.[1]The hallmark of ankylosing spondylitis(AS)phenotype is sacroiliac joint and spinal damage characterized by the new bone formation and joint fusion,which results in irreversible functional disability and reduced quality of life. | Yuankai Sun Jiajia Wang Yulu Qiu Shiyu Lin Fang Wang Wenfeng Tan | 2022 | Chinese Medical Journal2022，135，21： | 0 |
| 4 | Scale properties of turbulent transport and coherent structure in stably stratified flows显示文摘The empirical mode decomposition(EMD)is used to study the scale properties of turbulent transport and coherent structures based on velocity and temperature time series in stably stratified turbulence.The analysis is focused on the scale properties of intermittency and coherent structures in different modes and the contributions of energy-contained coherent structures to turbulent scalar counter-gradient transport(CGT).It is inferred that the velocity intermittency is scattered to more modes with the development of the stratified flow,and the intermittency is enhanced by the vertical stratification,especially in small scales.The anisotropy of the field is presented due to different time scales of coherent structures of streamwise and vertical velocities.There is global counter-gradient heat transport close to the turbulence-generated grid,and there is local counter-gradient heat transport at certain modes in different positions.Coherent structures play a principal role in the turbulent vertical transport of temperature. | Long ZHU Xiang QIU Jianping LUO Yulu LIU | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，4： | 0 |
| 5 | 鼻咽癌中血清C反应蛋白水平与临床分期的关系(英文)显示文摘Objective:The aim of our study was to explore the correlations between C-reactive protein(CRP) levels and clinical stages of nasopharyngeal carcinoma(NPC).Methods:We analyzed 108 cases,among them,68 cases were NPC,20 cases were benign inflammatory diseases of nasopharynx,20 cases were healthy volunteers as control.CRP was determined with immunoturbidimetry(ITM).Results:The mean concentrations of CRP in NPC(19.76 mg/L) were significantly increased compared to that in the control group(6.23 mg/L),while were significantly lower than that in benign inflammatory group(45.63 mg/L);The mean concentrations of CRP in T4 group(25.58 mg/L) were higher than that in T1 group(17.35 mg/L),T2 group(18.65 mg/L) and T3 group(15.61 mg/L).The mean concentrations of CRP in N3 group(28.04 mg/L) were higher than that in N0(17.62 mg/L),N1(21.27 mg/L),N2(18.62 mg/L) respectively,the mean concentrations of CRP in IV(25.74 mg/L) were higher than that in I(14.20 mg/L),Ⅱ(16.10 mg/L),Ⅲ(23.01 mg/L),respectively.Conclusion:The serum CRP level is associated with the occurrence of NPC and benign inflammatory disease of nasopharynx.In NPC,the CRP level has positive relationship with the TNM stage. | Chunling Jiang Jingao Li Fan Ao Yang Qiu Yulu Liao | 2010 | The Chinese-German Journal of Clinical Oncology2010，9，2： | 0 |
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