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Ambient air pollution and adverse birth outcomes: a systematic review and meta-analysis

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2019年第3期20卷 238-263页

作者： le-qian guo Yu CHEN Bai-bing MI Shao-nong DANG Dou-dou ZHAO Rong LIU Hong-li WANG Hong YAN Department of Epidemiology and Biostatistics School of Public HealthXi'an Jiaotong University Health Science CenterXi’an 710061China Medical Records Department the First Hospital of YulinYulin 718000China

Several reviews have assessed the relationship between exposure to ambient air pollution and adverse birth outcomes during pregnancy,but the results remain *** objective of this study was to assess this correlation quantitatively and to explore sources of *** included all published case-control or cohort studies that evaluated the correlation between ambient air pollution and low birth weight(LBW),preterm birth(PTB),and small for gestational age(SGA).Analytical methods and inclusion criteria were provided on the PROSPERO website(CRD42018085816).We evaluated pooled effects and *** analyses(grouped by exposure period,study settings,study design,exposure types,data source,Newcastle-Ottawa quality score(NOS),and adjustment for smoking or meteorological factors)were also conducted and publication bias was *** risk of bias in systematic reviews(ROBIS)tool was used to evaluate the overall risk of bias in this *** studies met the inclusion *** observed pooled odds ratios(ORs)of 1.03–1.21 for LBW and 0.97–1.06 for PTB when mothers were exposed to CO,NO2,NOx,O3,PM2.5,PM10,or SO2 throughout their *** SGA,the pooled estimate was 1.02 in relation to NO2 *** analysis and sensitivity analysis decreased the heterogeneity to some extent,such as the subgroups of continuous measures(OR=0.98(0.97–0.99),I2=0.0%)and NOS>7(OR=0.98(0.97–0.99),I2=0.0%)in evaluating the association between PTB and *** review was completed with a low risk of *** concentrations of air pollution were significantly related to the higher risk of adverse birth ***,the sources of heterogeneity among studies should be further explored.

关键词： Air pollution Low birth weight Preterm birth Meta-analysis Adverse birth outcome

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Retraction Note to:Ambient air pollution and adverse birth outcomes:a systematic review and meta-analysis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第9期21卷 756-756页

作者： le-qian guo Yu CHEN Bai-bing MI Shao-nong DANG Dou-dou ZHAO Rong LIU Hong-li WANG Hong YAN Department of Epidemiology and Biostatistics School of Public HealthXi'an Jiaotong University Health Science CenterXi'an 710061China Medical Records Department the First Hospital of YulinYulin 718000China

The authors have retracted this article(guo et al.,2019)because some data from the original literature had not been converted to appropriate units in the paper,which resulted in deviation of the meta-analysis *** example,for the forest plot used to examine associations between PMioexposure and the risk of adverse birth outcomes,the estimates from Brauer et al.(2008),Pedersen et al.(2013),Zhao et al.

关键词： estimates deviation converted

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Local Covering Subgroups in Finite Groups

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Acta Mathematica Sinica,English Series 2021年第5期37卷 768-774页

作者： guo Hua qian Department of Mathematics Changshu Institute of TechnologyChangshu 215500P.R.China

A subgroup A of a finite group G is called a local covering subgroup of G if A^(G)=AB for all maximal G-invariant subgroup B of A^(G)=(A^(G),g∈G).let p be a prime and d be a positive *** that all subgroups of p^(d),and all cyclic subgroups of order 4 when p^(d)=2 and a Sylow2-subgroup of G is nonabelian,of G are local covering *** G is p-supersolvable whenever p^(d)=p or p^(d)≤(√|G|_(p))or p^(d)≤|O_(p'p)(G)|_(p)/p.

关键词： Finite group local covering subgroup p-supersolvable group

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Localizing vitamin-C through nanoconfinement enables high-rate CO_(2) electrolysis to ethylene

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Science China Materials 2024年第3期67卷 1006-1008页

作者： Zhengyi qian Shaojun guo School of Materials Science and Engineering Peking UniversityBeijing 100871China

The electrosynthesis of value-added fuels and chemicals from carbon dioxide reduction reaction(CO_(2)RR)is a promising approach for realizing the objectives of carbon neutrality[1].Nevertheless,the current production of desirable multicarbon(C_(2+))chemicals,such as ethylene(C_(2)H_(4)),still encounters challenges related to low selectivity,low current density,and the requirement for high-purity feeding gas[2].

关键词： enable purity dioxide

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Macrophage based drug delivery:Key challenges and strategies

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Bioactive Materials 2024年第8期38卷 55-72页

作者： qian guo Zhong-Ming qian Laboratory of Drug Delivery School of MedicineShanghai University99 Shangda RoadShanghai200444China Institute of Translational and Precision Medicine Nantong University19 Qi Xiu RoadNantongJiangsu226019China National Clinical Research Center for Aging and Medicine of Huashan Hospital Fudan UniversityShanghai201203China

As a natural immune cell and antigen presenting cell,macrophages have been studied and engineered to treat human *** are well-suited for use as drug carriers because of their biological characteristics,such as excellent biocompatibility,long circulation,intrinsic inflammatory homing and ***,macrophages’uniquely high plasticity and easy re-education polarization facilitates their use as part of efficacious therapeutics for the treatment of inflammatory diseases or *** recent studies have demonstrated promising advances in macrophage-based drug delivery,several challenges currently hinder further improvement of therapeutic effect and clinical *** article focuses on the main challenges of utilizing macrophage-based drug delivery,from the selection of macrophage sources,drug loading,and maintenance of macrophage phenotypes,to drug migration and release at target *** addition,corresponding strategies and insights related to these challenges are ***,we also provide perspective on shortcomings on the road to clinical translation and production.

关键词： Macrophages Cell therapy Drug delivery Nano-or micro-particles Cell polarization

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天津市女大学生乳腺知识认知调查及影响因素

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中国现代医学杂志 2017年第5期27卷 63-67页

作者：黄淑敏杨心瑜郭乐倩李继超王晓墨张玉筠黄俊平张欣天津医科大学基础医学院天津300070 天津医科大学公共卫生学院天津300070 天津医科大学护理学院天津300070

目的了解天津市女大学生对乳腺相关疾病、疾病危险因素及自我检查知识的认知现状及其影响因素。方法采用分层整群随机抽样的方法调查天津市多所高校共1446例女生乳腺疾病相关知识水平的现状。结果该调查的平均年龄为(19.96±1.57)岁。... 详细信息

目的了解天津市女大学生对乳腺相关疾病、疾病危险因素及自我检查知识的认知现状及其影响因素。方法采用分层整群随机抽样的方法调查天津市多所高校共1446例女生乳腺疾病相关知识水平的现状。结果该调查的平均年龄为(19.96±1.57)岁。高校女生乳腺知识总得分为(24.79±9.37)分,其中分别包括乳腺相关疾病知识得分(4.87±2.87)分,疾病危险因素得分(11.10±5.09)分,自我检查知识得分(8.82±3.49)分,得分率分别为48.7%、55.5%和55.1%。多元线性回归分析显示年级、专业、母亲的受教育程度、是否上过生理课及情绪调节能力对高校女大学生的乳腺自检知识认知的影响有统计学意义(P<0.05)。高校女生乳腺知识的来源多为网络、广播电视录像或报纸杂志等途径并希望通过医务人员、网络和宣传手册等途径继续获取相关知识。结论女大学生对于乳腺疾病的认知包括对于危险因素及乳腺自检的认知受多种因素的影响。因此加强对在校学生乳腺疾病知识的宣传和教育对于有效预防、控制疾病的发生发展十分重要。

关键词：女大学生乳腺疾病认知乳房自检影响因素

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Representing conics by low degree rational DP curves

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第4期11卷 278-289页

作者： qian-qian HU guo-jin WANG Department of Mathematics Zhejiang University Hangzhou 310027 China College of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018 China

A DP curve is a new kind of parametric curve defined by Delgado and Pena （2003）; Jt has very good properties when used in both geometry and algebra, i.e., it is shape preserving and has a linear time complexity for evaluation. It overcomes the disadvantage of some generalized Ball curves that are fast for evaluation but cannot preserve shape, and the disadvantage of the B6zier curve that is shape preserving but slow for evaluation. It also has potential applications in computer-aided design and manufacturing （CAD/CAM） systems. As conic section is often used in shape design, this paper deduces the necessary and suffi- cient conditions for rational cubic or quartic DP representation of conics to expand the application area of DP curves. The main idea is based on the transformation relationship between low degree DP basis and Bemstein basis, and the representation tbeory of conics in rational low degree B6zier form. The results can identify whether a rational low degree DP curve is a conic section and also express a given conic section in rational low degree DP form, i.e., give positions of the control points and values of the weights of rational cubic or quartic DP conics. Finally, several numerical examples are presented to validate the effectiveness of the method.

关键词： Conic sections Bernstein basis DP basis Rational low degree Bezier curves Rational low degree DP curves

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Microsatellites reveal the genetic structure of thelytokous strains of the migratory locust

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Insect Science 2007年第3期14卷 193-199页

作者： ZHAO-qian TENG le KANG State Key Laboratory of Integrated Management of Pest and Rodents Institute of Zoology Chinese Academy of Sciences Beijing China

This study reports on two parthenogenetic strains of the migratory locust Locusta migratoria. The offspring of thelytokou females had a single fragment per microsatellite loci. All offspring of the parthenogenetic F1 females were genetically identical. These results further confirmed that restitution of the sister products of early cleavage mitoses and cell fusion might be the most likely diploidization mechanisms in the thelytokous locusts. Polymerase chain reaction amplification results demonstrated that thelytoky in the locust was not induced by Wolbachia bacteria. Apart from the low fitness gained in thelytokous females, large populations with migration and losing heterozygosity may be other reasons why regular parthenogenesis has not evolved in the locust.

关键词： genetic structure Locusta migratoria microsatellites thelytokous parthenogenesis Wolbachia

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Rational cubic/quartic Said-Ball conics

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Applied Mathematics(A Journal of Chinese Universities) 2011年第2期26卷 198-212页

作者： HU qian-qian WANG guo-jin Department of Mathematics Zhejiang University Hangzhou 310027 College of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018.

In CAGD, the Said-Ball representation for a polynomial curve has two advantagesover the B′ezier representation, since the degrees of Said-Ball basis are distributed in a step *** advantage is that the recursive algorithm of Said-Ball curve for evaluating a polynomialcurve runs twice as fast as the de Casteljau algorithm of B′ezier curve. Another is that theoperations of degree elevation and reduction for a polynomial curve in Said-Ball form are simplerand faster than in B′ezier form. However, Said-Ball curve can not exactly represent conics whichare usually used in aircraft and machine element design. To further extend the utilizationof Said-Ball curve, this paper deduces the representation theory of rational cubic and quarticSaid-Ball conics, according to the necessary and su？cient conditions for conic representation inrational low degree B′ezier form and the transformation formula from Bernstein basis to Said-Ballbasis. The results include the judging method for whether a rational quartic Said-Ball curve is aconic section and design method for presenting a given conic section in rational quartic Said-Ballform. Many experimental curves are given for confirming that our approaches are correct ande？ective.

关键词： Rational Said-Ball curve Rational B′ezier curve conics.

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Nonlinear Fractional-Order Dynamic Stability of Fluid-Conveying Pipes Constituted by the Viscoelastic Materials with Time-Dependent Velocity

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Acta Mechanica Solida Sinica 2022年第5期35卷 733-745页

作者： Ye Tang guo Wang qian Ding School of Mechanical Engineering Anhui Polytechnic UniversityWuhu241000China Department of Mechanics Tianjin UniversityTianjin300350China

Considering that the fluid-conveying pipes made of fractional-order viscoelastic material such as polymeric materials with pulsatile flow are widely applied in engineering,we focus on the stability and bifurcation behaviors in parametric resonance of a viscoelastic pipe resting on an elastic *** Riemann–Liouville fractional-order constitutive equation is used to accurately describe the viscoelastic *** on this,the nonlinear governing equations are established according to the Euler–Bernoulli beam theory and von Karman’s nonlinearity,with using the generalized Hamilton’s *** stability boundaries and steady-state responses undergoing parametric excitations are determined with the aid of the direct multiple-scale *** numerical examples are carried out to show the effects of fractional order and viscoelastic coefficient on the stability region and nonlinear bifurcation *** is noticeable that the fractional-order viscoelastic property can effectively reconstruct the dynamic behaviors,indicating that the stability of the pipes can be conspicuously enhanced by designing and tuning the fractional order of viscoelastic materials.

关键词： Pipes conveying fluid Fractional-order viscoelastic damping Parametric vibration Stability Bifurcation

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