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基于单桩静载试验结果的群桩基础沉降计算方法

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铁道学报 2017年第1期39卷 97-103页

作者：毛坚强蒋媛西南交通大学土木工程学院四川成都610031 中国电建集团成都勘测设计研究院有限公司四川成都610072

提出一个利用单桩静载试验结果及弹性理论法确定群桩基础沉降的方法。该法中,基础中各桩在自身所受竖向力作用下产生的沉降按静载试验得到的沉降-荷载关系确定,由他桩引起的沉降则根据试验得到的桩侧摩擦力分布曲线及桩端压力,应用弹性... 详细信息

提出一个利用单桩静载试验结果及弹性理论法确定群桩基础沉降的方法。该法中,基础中各桩在自身所受竖向力作用下产生的沉降按静载试验得到的沉降-荷载关系确定,由他桩引起的沉降则根据试验得到的桩侧摩擦力分布曲线及桩端压力,应用弹性理论法计算。计算中,对基础中各桩赋以不同的竖向力进行试算,从中寻找出能使承台的平衡方程及各桩沉降变形协调条件满足的组合,即为其真实解。按照上述原理,建立相应的计算公式,编制计算程序。最后,对一桥梁工程桩基础的沉降进行计算,并与实测结果进行对比,二者吻合较好,证明了本法的可行性及合理性。

关键词：桩基础沉降单桩竖向静载试验弹性理论法 Mindlin解

EM菌对杂交黄颡鱼“黄优1号”越冬期间养殖池水质、生长特性及非特异性免疫指标的影响

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水产科技情报 2024年第4期51卷 239-247页

作者：张雷鸣刘炜周国勤茆健强代雅凡裴雪莹石晓兰谢冰南京市水产科学研究所江苏南京210036 华中农业大学水产学院湖北武汉430070

为探究EM菌对越冬期间杂交黄颡鱼“黄优1号”养殖池水质、生长性能及非特异性免疫指标的影响,分别采用泼洒、拌料两种方式,使用EM菌饲养杂交黄颡鱼“黄优1号”[体质量(10.35±1.23)g,体长(8.5±0.4)cm],进行了42 d的饲养对比试验。结果... 详细信息

为探究EM菌对越冬期间杂交黄颡鱼“黄优1号”养殖池水质、生长性能及非特异性免疫指标的影响,分别采用泼洒、拌料两种方式,使用EM菌饲养杂交黄颡鱼“黄优1号”[体质量(10.35±1.23)g,体长(8.5±0.4)cm],进行了42 d的饲养对比试验。结果显示:养殖期间采用泼洒方式使用EM菌,该组养殖水体的溶解氧含量高于拌料使用EM菌组和对照组,氨氮和亚硝酸盐含量始终低于拌料使用EM菌组和对照组;拌料使用EM菌组杂交黄颡鱼“黄优1号”的存活率、增重率和特定生长率要高于另外两组,且脏体指数和肝体指数低于另外两组;两个使用EM菌试验组的酸性磷酸酶活性、碱性磷酸酶活性、超氧化物歧化酶活性和溶菌酶活性均显著高于对照组(P<0.05),且拌料组尤为显著。试验结果表明,使用EM菌能在一定程度上改善越冬期间养殖池的水质,对杂交黄颡鱼“黄优1号”生长具有明显的促进作用,并可增强其越冬后的非特异性免疫功能。

关键词：杂交黄颡鱼“黄优1号” 越冬免疫生长酶活

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Effect of 17α-hydroxyprogesterone on Synchronous Ovarian Development of Crayfish,Procambarus clarkii

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Animal Husbandry and Feed Science 2014年第6期6卷 312-315页

作者： Liu Wei Chen Shuqiao mao jianqiang Zhang Di Zhou Guoqin Fisheries Science Research Institute of Nanjing

Three different treatment methods, including topical application method, injection method and immersion method were employed to treat 17or - hydroxyprogesterone, so as to investigating its effect on ovarian development red swamp crayfish （Procambarus clarkii）. The results showed that all the three differ- ent methods could facilitate the synchronous ovarian development of red swamp crayfish at different degree, with the degree of maturity of 10% high compared with the control group. The highest maturity degree was 50% that was observed in immersion treatment group. The effect was determined as in order immersion method 〉 injection method 〉 topical apphcation method 〉 control group. The immersion method and the injection method could facilitate synchronization spawning of red swamp crayfish, with the order of immersion method 32.5%, injection method 20%, topical application 17.5% and the control group 17.5 %. Taking the synchro- nization spawning rate, final spawning rate and mortality into account, the order was the immersion method 〉 injection method 〉 topical application method 〉 control group.

关键词： Procambarus clarkia Ovary Synchronization development Spawning 17ct-hydroxyprogesterone

An　Improved　Method　for　the　Solution　of　Linear　Viscoelastic　Problems　with　FEM

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Journal of Modern Transportation 1996年第2期13卷 54-60页

作者： mao jianqiang Department of underground and geotechnical engineering,Southwest Jiaotong University,Chengdu 610031,China Department of under ground and geotechnical engineering Southwest Jiaotong University Chengdu 610031 China

For various viscoelastic models which are composed of springs and dashpots,their creep/relaxation functions usually are the sum of a series of exponential... 详细信息

For various viscoelastic models which are composed of springs and dashpots,their creep/relaxation functions usually are the sum of a series of exponential *** virtue of this characteristic,the recursion formulae to calculate viscous strain/stress increments during a time step can be ***,the corresponding FEM formulae are also given.A simple example in the end of this paper demonstrates that the precision of computational results is much improved with the method.

关键词： viscoelastic finite element method

Simulation and evaluation study of atmospheric aerosol nonsphericity as a function of particle size

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Particuology 2024年第7期90卷 281-291页

作者： Qianjun mao Xin Nie School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China College of New Energy and Materials Northeast Petroleum UniversityDaqing163318China

Aerosol nonsphericity causes great uncertainty in radiative forcing assessments and climate *** considerable studies have attempted to quantify this uncertainty,the relationship between aerosol nonsphericity and particle size is usually not considered,thus reducing the accuracy of the *** this study,a coupled inversion algorithm combining an improved stochastic particle swarm optimization algorithm and angular light scattering is used for the nonparametric estimation of aerosol nonsphericity variation with particle size,and the optimal sample selection method is employed to screen the *** on the verification of inversion accuracy,the variation of aerosol aspect ratio with particle size based on the ellipsoidal model in global regions has been obtained from Aerosol Robotic Network(AERONET)data,and the effect of nonsphericity on radiative forcing and dry deposition has been *** results show that the aspect ratio increases with particle size in all regions,with the maximum ranging from 1.4 to 1.8 in the desert,reflecting the differences in aerosol composition at different particle *** radiation calculations,considering aerosol nonsphericity makes the aerosol cooling effect weaker and surface radiative fluxes increase,but hardly changes the aerosol absorption,with maximum differences of 9.22%and 22.12%at the bottom and top of the atmosphere,***,the differences in radiative forcing between aspect ratios as a function of particle size and not varying with particle size are not significant,averaging less than 2%.Besides,the aspect ratio not varying with particle size underestimates the deposition velocity of small particles and overestimates that of large particles compared to that as a function of particle size,with maximum differences of 7%and 4%,respectively.

关键词： Aerosol nonsphericity Inversion Aspect ratio Radiative forcing Dry deposition velocity

接触问题的一种有限元解法及其在岩土工程中的应用

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土木工程学报 2004年第4期37卷 70-75页

作者：毛坚强西南交通大学土木工程学院

岩土结构与岩土体的界面及岩土体中存在的节理、滑动面等各类接触面的模拟是岩土计算中一个重要但尚未很好解决的问题 ,应用虚功原理建立接触问题的计算公式 ,发展了相应的有限元计算方法 ,并用该法计算了挡墙土压力、单桩承载力、盾构... 详细信息

岩土结构与岩土体的界面及岩土体中存在的节理、滑动面等各类接触面的模拟是岩土计算中一个重要但尚未很好解决的问题 ,应用虚功原理建立接触问题的计算公式 ,发展了相应的有限元计算方法 ,并用该法计算了挡墙土压力、单桩承载力、盾构法施工的隧道等问题 ,证明了该法求解岩土工程问题的可行性及有效性。

关键词：有限元法接触问题接触面岩土工程

Proof of Two Supercongruences of Truncated Hypergeometric Series_(4)F_(3)

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1015-1028页

作者： Guo Shuai mao Department of Mathematics Nanjing University of Information Science and TechnologyNanjing 210044P.R.China

In this paper,we prove two supercongruences conjectured by Z.-*** via the Wilf-Zeilberger *** of them is,for any prime p>3,4F3[7/6 1/2 1/2 1/2 1/6 1 1]-1/8]-1/2≡p(-2/p)+p^(3)/4(2/p)Ep-3 (mod p^(4))where(·/p)stands f... 详细信息

关键词： Supercongruence truncated hypergeometric series Wilf–Zeilberger method Euler numbers Legendre symbol

One bird,multiple stones:The race to find a gene of dominant negative effect in wheat

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The Crop Journal 2024年第4期12卷 951-952页

作者： Long mao State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

In the current issue of The Crop Journal,Chen et al.[1]reports map-based cloning of a wheat gene that showed temperaturedependent pleiotropic effects on multiple traits including plant height,leaf shape,spike and grain morphology,and accordingly was named WPA1 for Wheat Plant Architecture *** mutant was first observed among EMS-treated plants and repeatedly appeared in multiple occasions.

关键词： Wheat bird repeatedly

Dynamic steric confinement effect expands the frontier of Cu-catalyzed asymmetric propargylic aminations

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Science China Chemistry 2024年第10期67卷 3181-3183页

作者： Peng Chen mao-mao Zhang Wen-Jing Xiao Liang-Qiu Lu Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079China Wuhan Institute of Photochemistry and Technology Wuhan 430082China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics(LICP)Chinese Academy of SciencesLanzhou 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Chiralα-tertiary amines and related azacycles are commonly found in many natural products,pharmaceuticals and agrochemicals[1].Copper-catalyzed asymmetric propargylic amination(APA)reactions have been established as a reliable method to access enantio-enriched propargylic amines,largely due to the seminal contribution of Nishibayashi et al.[2]and van Maarseveen et al.[3]in 2008.

关键词： catalyzed asymmetric amines