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Influence of reaction piles on test pile response in a static load test

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 198-205页

作者： qian-qing zhang Shu-cai LI Zhong-miao zhang Geotechnical and Structural Engineering Research Center Shandong University MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University

This work presents a new analytical method to analyze the influence of reaction piles on the test pile response in a static load *** our method,the interactive effect between soil and pile is simulated using independent springs and the shear displacement method is adopted to analyze the influence of reaction piles on test pile ***,the influence of the sheltering effect between reaction piles and test pile on the test pile response is taken into *** cases are analyzed to verify the rationality and efficiency of the present *** method can be easily extended to a nonlinear response of an influenced test pile embedded in a multilayered soil,and the validity is also demonstrated using centrifuge model tests and a computer program presented in the *** present analyses indicate that the proposed method will lead to an underestimation of the test pile settlement in a static load test if the influence of the presence of reaction piles on the test pile response is neglected.

关键词： Test pile Reaction pile Shear displacement method Sheltering effect Multilayered soil

Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system

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Frontiers of Structural and Civil Engineering 2020年第4期14卷 961-982页

作者： qian-qing zhang Shan-Wei LIU Ruo-Feng FENG Jian-Gu qian Chun-Yu CUI Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China Key Laboratory of Geotechrical and Underground Engineering of the Minstry of Education Tongji UniversityShanghai 200092China

A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in *** differential settlement of pile groups will decrease the use-safety requirements of building,even cause the whole-building tilt or *** reduce differential settlement among individual piles,non-uniformly arranged pile groups can be *** paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile *** the userdefined subroutine FRIC as the secondary development platform,a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS *** to the response analysis of a single pile,the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer *** reinforcing effects of individual piles is then analyzed using the present finite element ***,the response of non-uniformly arranged pile groups,e.g.,individual piles with variable length and individual piles with variable diameter,is analyzed using the proposed numerical analysis *** suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes.

关键词： numerical simulation non-uniformly arranged pile groups differential settlement pile-soil interaction

Geochemical Characteristics and Tectonic Setting of the Laohushan Basalts, North Qilian Mountains

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Acta Geologica Sinica(English Edition) 2001年第4期75卷 452-457页

作者： qian qing and zhang Qi Institute of Geology and Geophysics, CAS, P. O. Box 9825, Beijing 100029 CAS Inst Geol & Geophys Beijing 100029 Peoples R China

The Ordovician Laohushan ophiolite, located in the eastern part of the North Qilian Mountains, is mainly composed of meta-peridotites, gabbros and basalts alternating with sediments. The sediments are mainly turbidites, including sandstones, siltstones, cherts etc. Major elements show that the basalts are subalkaline tholeiites and may be analogous to ocean-floor basalts. Except a few N-MORBs, most of the basalts are E-MORBs as indicated by incompatible element ratios such as (La/Ce)N, La/Sm, Ce/Zr, Zr/Y and Zr/Nb. Negative Nb anomaly is common but negative Zr, Hf and Ti anomalies are quite rare. Based on the geochemical characteristics, it is suggested that the Laohushan basalts were formed in a back-arc basin. ENd (t) of the basalts ranges between +3.0 and +8.9 and (87Sr/86Sr), ranges between 0.7030 and 0.7060, indicating a depleted mantle source which was mixed with more or less enriched mantle components. Furthermore, the petrography of the sandstones and geochemistry of the cherts suggest that the sediments were deposited near a continental margin.

关键词： North Qilian Mountains Laohushan basalts sediments geochemistry

The computer-assisted carboxypeptidase method for C-terminal sequencing of proteins and polypeptides

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Acta Chimica Sinica(English Edition) 1988年第4期6卷 348-358页

作者： WANG Yu~* SUN Xiao-Jian qian Cheng qian Rui-qing zhang Wei-Jun Shanghai Institute of Organic Chemistry,Academia Sinica,ShanghaiGU Tian-Jue Department of Biochemistry,Shanghai Medical University,Shanghai Shanghai Institute of Organic Chemistry Academia Sinica Shanghai Department of Biochemistry Shanghai Medical University Shanghai

On further study of the computer-assisted carboxypeptidase method for sequencing the C-terminals of proteins or peptides,two computer programs-DPS and CPA were successfully developedon VAX-11/780 computer and tested with some synthetic peptides and the degradation fragment ofthe natural protein as model *** C-terminal sequence of CB-3,one of the CNBr degra-dation fragments of trichosanthin,had first been determined by this method as:-Ser-Ala-Ser-Ala-Ala-Leu-Hse-OH,which was later confirmed by other ways of *** method is not only ableto extend the C-terminal sequencing up to 7 amino acid residues,but also useful for determining theC-terminal sequence with repeating amino acid residues.

关键词： Pro The computer-assisted carboxypeptidase method for C-terminal sequencing of proteins and polypeptides

甘肃大佛寺、金佛寺花岗岩体的锆石U-Pb年龄、Hf-O同位素和全岩地球化学特征及地质意义

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岩石学报 2017年第10期33卷 3091-3108页

作者：孙宝璐钱青张建新中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所北京100029 中国科学院大学北京100049 中国科学院青藏高原地球科学卓越创新中心北京100101 中国地质科学院地质研究所北京100037

走廊过渡带大佛寺花岗岩为弱过铝质(A/CNK=1.03~1.06),SiO_2(76.7%~78.9%)、全碱(Na2O+K2O=7.7%~8.3%)、Rb(303×10^(-6)~383×10^(-6))、Nb(32×10^(-6)~42×10^(-6))、重稀土(Yb^8×10^(-6))含量以及和FeOT/MgO(6.3~7.6)、Ga/Al(>3×10-4)、Rb/Ba(3.0~6.2)比值较高,MgO(~0.1%)、CaO(0.5%~0.6%)含量较低,Ba、Sr、Eu、Ti强烈亏损,属A型花岗岩,其源岩可能为泥质岩。大佛寺花岗岩中锆石δ18O和εHf(t)值分别为7.8‰~8.6‰(平均8.24±0.13‰)和-4.8^-2.0,Hf同位素两阶段亏损地幔模式年龄1540~1717Ma,岩浆温度达到~820℃以上。北祁连造山带北缘金佛寺花岗岩为过铝质(A/CNK=1.0~1.1),SiO_2(65.5%~75.0%)、MgO(0.6%~2.2%)、Fe2O3(1.9%~5.2%)、TiO_2(0.3%~0.8%)含量变化较大,其主量和微量元素特征与北祁连造山带的柴达诺花岗岩相似,源岩可能包括杂砂岩和角闪岩。金佛寺花岗岩的锆石δ18O为7.4%~9.7‰(平均8.03±0.36‰),εHf(t)在-0.5^+1.9之间,Hf同位素两阶段亏损地幔模式年龄为1289~1439Ma,岩浆温度达到800~900℃。走廊过渡带大佛寺花岗岩、北祁连造山带北缘金佛寺花岗岩的锆石U-Pb SIMS年龄分别为426.1±2.8Ma、424.0±1.6Ma,不同构造单元发育同时期岩浆活动以及A型花岗岩的出现,表明在~425Ma北祁连洋盆已经闭合,北祁连造山带及邻区进入到后碰撞拉伸阶段。

关键词：北祁连造山带走廊过渡带花岗岩锆石U-Pb年龄地球化学

GEOCHEMISTRY OF AN EARLY PALEOZOIC BIMODAL VOLCANIC SUITE AT BIANMAGOU AREA, NORTH QILIAN MOUNTAIN, NW CHINA

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Scientia Geologica Sinica 2000年第2期 195-203页

作者： Wang Yan qian qing and zhang Qi (Institute of Geology and Geophysics Chinese Academy of Sciences, Beijing 100029)

Major and trace elements, REE concentrations and Sr, Nd isotope composihons have been measured in Bianmgou basaltic andesite-rhyolite bimodal association of intraoceanic arc of early Paleozoic age. Basaltic andesites have high MgO (5.78～9.71%) and very low TiO2, (0.30～0.45%) content with Ti/Zr ratios 63～73. Their REE show flat or slightly LREE depleted patterns with (La/Yb)= 0.65～1.55 and the HREE concentrations are relatively low with YbN ranging from 5～9. They are also depleted in HFSE (Zr,Nb, Y, V) with some 8～10 times the Zr chondritic abundances and 5～9 times of the Y chondritic abundances. All of these give them a strong affinity with boninite. Rhyolites are characterized by very low but rather constant contents of TiO2, and incompatible trace elements like La, Th, Nb or Zr, and show flat or slightly enriched LREE patterns with (La/YbN)ranging from 1～3 and with 11～37 times the La chondritic abundances and a negative Eu anomaly. They exhibit a pronounced Nb and Ti giving them a strong affinity with island arc series. The εNd (t) values of rhyolites and basaltic andesites fall in the range of +3.5 to +3.9 and of+3. 1 to +3.4. Basaltic andesites are likely to be evolved from partial melting of mantle wedge. Inconstant trace element ratios throughout the association and dominant rhyolites in the association rules out the fractionation-controlled origin of rhyolitic magmas, but support the hypothesis that Bianmagou rhyoIites may be formed by anatexis of hydrothermally altered local oceanic *** bimodal volcanic rocks record a magmatism of inter-arc basin environment

关键词： AT NORTH QILIAN MOUNTAIN NW CHINA GEOCHEMISTRY OF AN EARLY PALEOZOIC BIMODAL VOLCANIC SUITE AT BIANMAGOU AREA La zhang

Geochemical Characteristics and Tectonic Setting of the Laohushan Basalts,North Qilian Mountains

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Geochemical Characteristics and Tectonic Setting of the Laoh...

Synergistically enhanced ORR and HER performance on Co-N-C coupled in-situ generated PtCo intermetallic

中国科学院地质与地球物理研究所2001学术年会

作者： qian qing and zhang Qi Institute of Geology and Geophysics,CAS,P.O.Box 9825,Beijing 100029

The Ordovician Laohushan ophiolite,located in the eastern part of the North Qilian Mountains,is mainly composed of meta-peridotites,gabbros and basalts alternating with *** sediments are mainly turbidites,including sandstones,siltstones,cherts *** elements show that the basalts are subalkaline tholeiites and may be analogous to ocean-floor *** a few N-MORBs,most of the basalts are E-MORBs as indicated by incompatible element ratios such as(La/Ce),La/Sm,Ce/Zr,Zr/Y and Zr/*** Nb anomaly is common but negative Zr,Hf and Ti anomalies are quite *** on the geochemical characteristics,it is suggested that the Laohushan basalts were formed in a back-arc basin.ε(t) of the basalts ranges between +3.0 and +8.9 and(Sr/Sr) ranges between 0.7030 and 0.7060,indicating a depleted mantle source which was mixed with more or less enriched mantle ***, the petrography of the sandstones and geochemistry of the cherts suggest that the sediments were deposited near a continental margin.

关键词： North Qilian Mountains Laohushan basalts sediments geochemistiy

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Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu Luo Min Song Lulu An Xiao Huang qian zhang Chenhao zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a composite catalyst is vital to realize efficient ***,a synergistic composite catalyst consisting of Co atomic sites and in-situ generated PtCo intermetallic compounds （IMCs）(o-PtCo@CoNC) is proposed through Co pre-anchoring and subsequent impregnation-reduction *** loading of Co atoms provides a chance for in-situ generating PtCo ordered intermetallic *** remaining Co single atoms and PtCo IMCs construct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt Co IMCs and Co single atoms,o-PtCo@CoNC exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-PtCo@CoNC delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites coupled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Electrolytic reduction

Revolutionizing photothermal CO_(2)hydrogenation with ceria-based catalysts

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Nano Research 2025年第1期18卷 30-49页

作者： Zhaorui zhang Xiao Han Junhong zhang Yunyun Dong Jinsheng Zhao qian Xu ingqiang zhang School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252059China Institute for Catalysis Hokkaido UniversityN-21W-10Sapporo 001-0021Japan National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

In the context of achieving carbon neutrality,CO_(2)catalytic conversion technologies are effective in reducing atmospheric CO_(2)concentrations while simultaneously producing renewable *** approach is seen as a viable method for constructing a new carbon cycle,thereby effectively addressing the issue of global *** CO_(2)conversion has recently emerged as a promising research focus due to its high energy utilization efficiency,superior CO_(2)conversion,excellent product selectivity,mild operating conditions,low energy consumption and minimal operating *** oxide(CeO_(2))has been widely used in photothermal catalysis due to its unique chemical properties,particularly when used as a support material with supported metals,creating distinctive interfacial sites for catalytic *** an emerging star support in photothermal CO_(2)conversion,its contributions are equally significant and should not be ***,to our knowledge,there has been no comprehensive review of CeO_(2)applications in catalytic hydrogenation of CO_(2).In this paper,we summarize and discuss CeO_(2)-based materials for photothermal CO_(2)conversion to value-added *** research particularly focuses on the synthesis methods of CeO_(2)-supported catalysts,the history of CeO_(2)in photothermal catalysis,types of photothermal catalytic reactors,unique characterization methods for the photothermal catalysts and the photothermal CO_(2)hydrogenation reactions by CeO_(2)-based *** related to further challenges and future directions for photothermal CO_(2)hydrogenation are also provided.

关键词： CO_(2)neutrality hydrogenation photothermal catalysis ceria C1 chemistry