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| 1 | Cenozoic volcanism and lithospheric tectonic evolution in Qiangtang area, northern Qinghai-Tibet Plateau显示文摘Following the collision between the Indian and Eurasian plates, the Cenozoic vol- canic activities are rather frequent in the Qiangtang area of northern Qinghai-Tibet Plateau. They can be divided into four series: alkaline basalt series, high-K calc-alkaline series, shoshonitic series and peralkaline potassic-ultrapotassic series. Geochemical data suggest that the magma sources of Cenozoic volcanic rocks have transferred from spinel lherzolite mantle in the early stage to garnet peridotite enriched mantle (EM2) in the later stage. The high Mg# number and extremely high Cr-Ni-Co abundance of high-K calc-alkaline and shoshonitic series andesites in the Qiangtang area indicate that the primary magma might be derived from subduction of conti- nent lithosphere from the Lhasa block. Incompatible element ratios of La/Rb, Zr/Rb, Rb/Nb, K/Nb, Pb/La and K/La of peralkaline potassic-ultrapotassic series lavas in northern Qinghai-Tibet Pla- teau are lower than island arc volcanic rocks and higher than and similar to oceanic island ba- salts. This signature indicates that the primary magma derive from a paleo-mantle wedge inter- fused by fluids derived from asthenosphere and/or subducted mantle lithosphere. But the above element ratios of ultrapotassic lavas in southern Tibet and ultrapotassic lamprophyres in eastern Tibet are higher than and similar to island arc volcanic rocks, which means that the primary magma sources contained a large quantity of crust contaminant from fluids and/or melts derived from subducted continent lithosphere. The studies result supports that the indian continental lithosphere has underthrust beneath Tibet to about the middle of the plateau, and Eurasian (Qaidam basin) mantle lithosphere has underthrust beneath the Qiangtang area of northern Tibet Plateau. In the paper we demonstrate further that the pulsing cycles of potassic-ultrapotassic volcanism of the Qinghai-Tibet Plateau result from an asthenospher pulsing upwelling caused by the intraplate subduction and the stress relaxation in hinterland plateau caused by large-scale regional strike-slip tectonic pulsing activities in northern and eastern Qinghai-Tibet Plateau. | CHI Xiaoguo LI Cai JIN Wei | 2005 | Science China Earth Sciences2005，48，7： | 14 |
| 2 | Study on the velocity structure of the crust in Southwest Yunnan of the north-south seismic belt—Results from the Menghai-Gengma-Lushui deep seismic sounding profile显示文摘Southwest Yunnan, located in the southern segment of the north-south seismic belt, is one of the regions with strong tectonic movement and seismic activity in China. Study on the characteristics of tectonic setting and deep geophysical field in the region is an important issue in basic science. In 2013, we conducted a 600-km-long Menghai-Gengma-Lushui profile of deep seismic wide-angle reflection/refraction and high-resolution seismic refraction in Southwest Yunnan. In this paper, we use 6 groups of clear intracrustal P-wave phases picked from the seismic record sections of 11 shots to build a velocity structure model of basement and 2D crustal P-wave of the region by using finite difference inversion and ray travel time forward fitting technology. The results show that, from south to north, the crust gradually thickens along the profile and its basement shows a significant lateral heterogeneity. In the vicinity of the Nanting River fault, the basement structure shows the character of alternate depressions and uplifts, and the shallowest basement is about 1.0 km. In the vicinity of Tengchong and Lancang, the basement is about 5.0 km deep. The velocity of the middle and lower crust in the region generally increases with the increasing of depth. At the block boundary and beneath the fault tectonic belt, the velocity contours show apparent irregularity and the P-wave velocity changes sharply. In this region, the Moho gradually deepens from south to north with relatively large lateral undulations. The shallowest point of the Moho is located near Menghai at a depth of about 32.0 km. The deepest point of the Moho is located near Tengchong at a depth of about 40.5 km. Between Gengma and Yongde, the Moho shows significantly fast uplifting and depressing with an amplitude of about 4.0 km. Beneath the Nanting River fault, Longling-Ruili fault, Dayingjiang fault and Tengchong volcano, the basement velocity structure, 2D crustal P-wave velocity structure, distribution of average profile velocity and intracrustal interface spreading also show significant changes from the basement to the top of the Moho, indicating that the crustal velocity and medium physical properties beneath the fault tectonic belt are apparently different from the crustal materials on its both sides, which suggests that these faults should be in a certain scale and may extend to the lower crust or the top of the upper mantle. The earthquakes in the region mainly occurred at a depth of 10–20 km, and the seismic activity is related to the intracrustal medium velocity difference and fault belt distribution. The results can serve as the important data of the crust-mantle structure for the analysis of the deep tectonic setting, earthquake precise positioning, seismogenic structure modeling of the seismic activities in Southwest Yunnan, as well as the important reference for the evaluation of seismic hazard and the planning of earthquake disaster mitigation of this region. | WANG ShuaiJun LIU BaoJin ZHANG JianShi LIU BaoFeng DUAN YuLing SONG XiangHui DENG XiaoGuo MA CeJun ZANG YiRan | 2015 | Science China Earth Sciences2015，58，12： | 13 |
| 3 | Geochemical Characteristics and Geological Significance of Early Permian Baya'ertuhushuo Gabbro in South Great Xing'an Range显示文摘领域地质的调查和 geochemical 分析在南方伟人 Xing'an 在 Baya'ertuhushuo 斑粝岩上被执行范围。当以前想了,领域调查表明斑粝岩是 magmatic 侵入而非一间 ophiolite 套房的一个部件。标明日期的诱导地联合的血浆团光谱学(LA-ICP-MS ) U-Pb 显示的锆石激光脱离斑粝岩在 274275 妈,被形成就作为 Dashizhai 形成(P1d ) 的普遍暴烈的岩石,在学习区域的 monzogranites 和 miarolitic 碱长石花岗石。斑粝岩有在 47.23 wt% 之间的 SiO2 内容,分别地, 50.17 wt% ,高 MgO 和 FeOT 6.9511.29 满足 wt% 和 7.3212.24 wt% ,它在 SiO2-K2O 图属于 low-K tholeiitic 系列。使球粒状陨石正常化的稀土元素元素(REE ) 模式和斑粝岩的原始使披风正常化的蜘蛛图除了大离子亲石元素元素(LILE ) 的丰富类似于正常海中央理兹暗岩(N-MORB ) 的那些,例如 Rb, Ba 和 K。在踪迹元素构造的歧视的图,样品主要也在 situ Lu-Hf 同位素的分析在 N-MORB 领域,和锆石里被阴谋显示斑粝岩从弄空的披风发源。通过 geochemical 特征的合成研究和 Baya'ertuhushuo 斑粝岩的 petrogenesis ,在区域的 Dashizhai 形成和 granitoids 的暴烈的岩石,在 Xilinhot-Xiwuqi 区域的早二叠的 magmatism 在岩流圈 upwelling 的构造背景形成了,这被建议,它被 subducted 的打破离开引起Paleo亚洲的海洋平板。 | LIU Jianfeng CHI Xiaoguo ZHAO Zhi ZHANG Xingzhou MA Zhihong WANG Tiefu HU Zhaochu | 2011 | Acta Geologica Sinica(English Edition)2011，85，1： | 12 |
| 4 | Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a显示文摘The upwelling area in the Changjiang Estuary was selected to collect the core, where the red tide occurred frequently and hypoxic existed. The total organic carbon (TOC), total nitrogen (TN), biogenic silica (BSi) and stable organic carbon isotopic ratios(δ13 Corg) were determined on the 210Pb-dated sediment core. The concentrations of TOC, TN, BSi as well as their sedimentation fluxes have increased to some extent since the 1970s. TOC and TN fluxes increased about 45%, 36% respectively. The average δ13 Corg value in the core was -23.67×10-3 which remained nearly constant before the 20 century. The δ13 Corg values increased after the 1900s, two marked increases were observed from the 1950s and the 1970s. A simple δ13 Corg model was used to estimate the contribution of terrigenous and marine organic matter inputs for the sediment, which indicated the increase in accumulation since the 1970s has been almost exclusively marine. The increasing of marine organic matter accumulation (TOC, TN and BSi) was corresponding with the increasing of fertilizer consumption and the NO3-N budgets from the Changjiang River. The riverine runoff of fertilizers and nutrients stimulated the algae blooming. Enhanced primary production resulted in an enrichment of organic matter in the sediment. These data support the hypothesis that anthropogenic nutrient loading has been a significant factor on the eutrophication in the Changjiang Estuary. | FENG Xuwen JING Xianglong YU Xiaoguo LI Hongliang CHEN Jianfang QIAN Jiangchu | 2008 | Acta Oceanologica Sinica2008，27，6： | 12 |
| 5 | Laser joining of CFRTP to titanium alloy via laser surface texturing显示文摘Grid pattern was textured on Ti-6 Al-4 V alloy(TC4)substrate surface by nanosecond laser system.Laser joining of carbon fiber reinforced thermoplastic composite(CFRTP)to TC4 joints were performed,and the effect of texture grid depth was investigated.The contact angle of molten CFRTP on textured TC4 surface was measured and the tensile-shear force was tested.The fracture surface and interface morphology were observed.The results indicated that the wettability of molten CFRTP on TC4 surface improved remarkably after laser textured TC4.Shear force of CFRTP/TC4 joints was increased by 156%after laser textured TC4 surface.When the depth of grid was deeper than 100μm,contact angle increased and incomplete filling of molten CFRTP in grid occurred,the shear force thus decreased gradually.Resin-carbon fibers mixture was adhered on the fracture surface of TC4,and the variation tendency of adhesion ratio was consistent with that of shear force.TC4 matrix was exfoliated from substrate and adhered at the fracture surface of CFRTP,indicating stronger mechanical interlocking occurred at the joining interface after laser textured TC4 surface.Beside mechanical interlocking,compound layer consisted of CTi_(0.42)V_(1.58)carburization phase was also confirmed at interface,suggesting that chemical bonding also occurred at the joining interface. | Caiwang TAN Jianhui SU Ziwei FENG Yifan LIU Bo CHEN Xiaoguo SONG | 2021 | Chinese Journal of Aeronautics2021，34，5： | 11 |
| 6 | Brazing of C/C composite and Ti-6Al-4V with graphene strengthened AgCuTi filler:Effects of graphene on wettability,microstructure and mechanical properties显示文摘Graphene nanosheets(GNSs) strengthened AgCuTi composite filler(AgCuTi_G) was used to braze C/C composite and Ti-6Al-4V. The effects of GNSs on the wettability of AgCuTi_G filler on the C/C composite surface and the interfacial microstructure and mechanical properties of brazed joints were investigated. The results indicate that the addition of GNSs reduced the wettability of AgCuTi_G. The interfacial microstructure of brazed joints evolved with the addition of GNSs, where Ti_3Cu_4 and TiCu_4 were converted to TiCu and the thickness of the reaction layer adjacent to the base material decreased. The maximum shear strength of joints brazed at 0.3 wt% GNSs was 23.3 MPa(880℃/10 min). Further adding GNSs deteriorated the shear strength of the joints. Fracture of the joints occurred in the C/C composite substrate and the TiC layer adjacent to C/C composite. | Duo LIU Yanyu SONG Yinghao ZHOU Xiaoguo SONG Wei FU Jicai FENG | 2018 | Chinese Journal of Aeronautics2018，31，7： | 11 |
| 7 | Vacuum brazing of GH99 superalloy using graphene reinforced BNi-2 composite filler显示文摘A novel graphene reinforced BNi-2 composite filler was developed for brazing GH99 superalloy. The interfacial microstructure of brazed joints was analyzed by field emission scanning electron microscope and a transmission electron microscope. The effects of graphene addition on the microstructure evolution and mechanical properties of brazed joints were investigated, and the strengthening mechanism of graphene was analyzed. The results revealed that due to the addition of graphene, M23(C,B)6 compounds were synthesized in the solid solution and brittle boride precipitates near the brazing seam decreased.Graphene was effective in retarding solute atoms diffusion thus impeding the precipitation of borides.Furthermore, the low coefficient of thermal expansion(CTE) of graphene was conducive to relieve stress concentration of the brazed joints during the cooling process. The shear strengths of brazed joints were significantly improved by exerting the strengthening effect of graphene. The maximum shear strengths of the brazed joints were 410.4 MPa and 329.7 MPa at room temperature and 800?C, respectively. | Duo Liu Yanyu Song Bin Shi Qi Zhang Xiaoguo Song Hongwei Niu Jicai Feng | 2018 | Journal of Materials Science & Technology2018，34，10： | 10 |
| 8 | Dynamic channel reservation scheme based on priorities in LEO satellite systems显示文摘According to low earth orbit(LEO) satellite systems with users of different levels, a dynamic channel reservation scheme based on priorities is proposed. Dynamic calculation of the thresholds for reserved channels is the key of this strategy. In order to obtain the optimal thresholds, the traffic is predicted based on the high-speed deterministic movement property of LEO satellites firstly. Then, a channel allocation model based on Markov is established. Finally, the solution of the model is obtained based on the genetic algorithm. Without user location, this strategy effectively reduces handover failures and improves channel utilization by adjusting dynamically the thresholds according to traffic conditions. The simulation results show that the system's overall quality of service can be improved by this strategy. | Jian Zhou Xiaoguo Ye Yong Pan Fu Xiao Lijuan Sun | 2015 | Journal of Systems Engineering and Electronics2015，26，1： | 8 |
| 9 | Study on Surface and Bulk Properties of Ce-5 % Lanthanum Alloy显示文摘The surface and bulk properties of Ce-5% La were studied with X-ray photoelectron spectroscopy (XPS)and X-ray diffraction (XRD), respectively.The XRD analysis shows that cerium in bulk is in γ-phase, and its lattice parameter is 0.516 nm.And we also find Ce2O3 in the bulk from the XRD figure but no existence of metal lanthanum because of its small quantity.The XPS analysis shows that there are always oxides existing in the surface.The O1s peak always exists at the binding energy of 530.3 eV, which may be attributed to Ce2O3 and La2O3, but no evidence was found for the existence of CeO2.It is concluded that there is a thick layer of Ce2O3 on the sample surface.And the Ce3d peak show multi-split in the figure, in which there are two peaks in each region, 3d5/2 and 3d3/2, and the binding energy of these peaks are 882.86, 887.70 eV for 3d5/2, and 901.44, 905.93 eV for 3d3/2.The special phenomena can be attributed to the changes of 4f electronic configuration, and the cerium in the sample exhibits properties similar to Ce2O3.But the influence of the addition of lanthanum to cerium is not visible, and further investigations are expected. | Luo Lizhu Wang Xiaolin Fu Xiaoguo Zhang Yanzhi Zhao Zhengping Liu Chunrong | 2004 | Journal of Rare Earths2004，22，z1： | 7 |
| 10 | Analysis of trace mercury in water by solid phase extraction using dithizone modified nanometer titanium dioxide and cold vapor atomic absorption spectrometry显示文摘A new method for analysis of trace mercury in water samples was developed, based on the combination of preconcentration/separation using dithizone-modified nanometer titanium dioxide (TiO2) as a solid phase extractant and determination by cold vapor atomic adsorption spectrometry (CVAAS). Dithizone was dissolved with alcohol and loaded on the surface of nano-sized TiO2 powders by stirring. The static adsorption behavior of Hg2+on the dithizone-modified nanoparticles was investigated in detail. It was found that excellent adsorption ratio for Hg2+ could be obtained in the pH range of 7-8 with an oscillation time of 15 min, and a 5 mL of 3.5 molL1 HCl solution could quantitatively elute Hg2+ from nanometer TiO2 powder. Common coexisting ions caused no obvious influence on the determination of mercury. The mechanisms for the adsorption and desorption were discussed. The detection limit (3σ) for Hg2+ was calculated to be 5 ngL1. The proposed method was applied to the determination of Hg2+ in a mineral water sample and a Zhujiang River water sample. By the standard addition method, the average recoveries were found to be 94.4%-108.3% with RSD (n = 5) of 2.9%-3.5%. | MA Xiaoguo HUANG Bei CHENG Meiqing | 2007 | Rare Metals2007，26，6： | 5 |
| 11 | Novel Wx alleles generated by base editing for improvement of rice grain quality显示文摘Amylose content(AC),which is regulated by the Waxy(Wx)gene,is a major indicator of eating and cooking quality(ECQ)in rice(Oryza sativa).Thus far,only a limited number of mutations in the N-terminal domain of Wx were found to have a major impact on the AC of rice grains and no mutations with such effects were reported for other regions of the Wx protein.Here,nucleotide substitutions in the middle region of Wx were generated by adenine and cytosine base editors.The nucleotide substitutions led to changes in 15 amino acid residues of Wx,and a series of novel Wx alleles with ACs of 0.3%-29.43%(wild type with AC of 19.87%)were obtained.Importantly,the waxy~(abe2)allele showed a'soft rice'AC,improved ECQ,favorable appearance,and no undesirable agronomic traits.The transgenes were removed from the waxy~(abe2)progeny,generating a promising breeding material for improving rice grain quality. | Xiaorui Huang Fei Su Sheng Huang Fating Mei Xiaomu Niu Changle Ma Hui Zhang Xiaoguo Zhu Jian-Kang Zhu Jinshan Zhang | 2021 | Journal of Integrative Plant Biology2021，63，9： | 4 |
| 12 | Joints of continuous carbon fiber reinforced lithium aluminosilicate glass ceramics matrix composites to Ti60 alloy brazed using Ti-Zr-Ni-Cu active alloy显示文摘Continuous carbon fiber reinforced lithium aluminosilicate glass ceramics matrix composites(C_f/LAS composites) are joined to Ti60 alloy vacuum brazed using Ti-Zr-Ni-Cu brazing alloy. The effects of the brazing temperature on the interfacial microstructure and mechanical properties of brazed joints are investigated in details. The interfacial microstructure varies apparently with an increase of the brazing temperature. The thicknesses of the banded Ti solid solution(Ti(s, s)) and the reactive layer between Cf/LAS composites and the interlayer grow gradually. The mechanical properties of brazed joints increase firstly and then decrease with an increasing temperature. In addition, a joint that is brazed at 980 °C for 10 min shows the highest shear strength of$38.13 MPa. At the same time, the fracture paths of brazed joints also change as the temperature increases. When the brazing temperature is 950 °C, the fracture position is in the TiC + ZrC +Ti_2O + ZrSi_2+ Ti_5Si_3 layer on the composite side. When the brazing temperature is 980 °C, the fracture position is on the side of the braze seam(Ti, Zr)2(Ni, Cu), Ti_2O + ZrSi_2+ Ti_5Si_3 layer,and carbon fiber in the composite material. When the brazing temperature is 990 °C, the fracture position is in the Ti_2O + ZrSi_2+ Ti_5Si_3 layer on the composite side and the carbon fiber in the composite material. | Shengpeng HU Dongdong FENG Long XIA Ke WANG Renwei LIU Zhentao XIA Hongwei NIU Xiaoguo SONG | 2019 | Chinese Journal of Aeronautics2019，32，3： | 4 |
| 13 | 中国第9次北极考察概述显示文摘中国第9次北极考察航次于2018年7月20日至9月26日执行,在白令海、楚科奇海、楚科奇海台、门捷列夫海岭和加拿大海盆开展了物理海洋、海洋气象、海冰、海洋化学、海洋生物、海洋生态、地质和地球物理等多学科综合考察。本文对中国第9次北极考察取得的主要成果进行了概述。 | WEI Zexun CHEN Hongxia LEI Ruibo YU Xiaoguo ZHANG Tao LIN Lina TIAN Zhongxiang ZHUANG Yanpei LI Tao YUAN Zhuoli | 2020 | Atmospheric and Oceanic Science Letters2020，13，1： | 4 |
| 14 | Grain size composition and transport of sedimentary organic carbon in the Changjiang River(Yangtze River) Estuary and Hangzhou Bay and their adjacent waters显示文摘Surface sediments from the Changjiang River(Yangtze River) Estuary,Hangzhou Bay,and their adjacent waters were analyzed for their grain size distribution,organic carbon(OC) concentration,and stable carbon isotope composition(δ13C).Based on this analysis,about 36 surface sediment samples were selected from various environments and separated into sand(>0.250 mm,0.125–0.250 mm,0.063–0.125 mm) and silt(0.025–0.063 mm)fractions by wet-sieving fractionation methods,and further into silt-(0.004–0.025 mm) and clay-sized(<0.004mm) fractions by centrifugal fractionation.Sediments of six grain size categories were analyzed for their OC andδ13C contents to explore the grain size composition and transport paths of sedimentary OC in the study area.From fine to coarse fractions,the OC content was 1.18%,0.51%,0.46%,0.42%,0.99%,and 0.48%,respectively,while theδ13C was –21.64‰,–22.03‰,–22.52‰,–22.46‰,–22.36‰,and –22.28‰,respectively.In each size category,the OC contribution was 42.96%,26.06%,9.82%,5.75%,7.09%,and 8.33%,respectively.The OC content in clay and fine silt fractions(<0.025 mm) was about 69.02%.High OC concentrations were mainly found in offshore modern sediments in the northeast of the Changjiang River Estuary,in modern sediments in the lower estuary of the Changjiang River and Hangzhou Bay,and in Cyclonic Eddy modern sediments to the southwest of the Cheju Island.Integrating the distribution of terrestrial OC content of each grain size category with the δ13C of the bulk sediment indicated that the terrestrial organic material in the Changjiang River Estuary was transported seaward and dispersed to the Cyclonic Eddy modern sediments to the southwest of the Cheju Island via two pathways:one was a result of the Changjiang River Diluted Water(CDW) northeastward extending branch driven by the North Jiangsu Coastal Current and the Yellow Sea Coastal Current,while the other one was the result of the CDW southward extending branch driven by the Taiwan Warm Current. | ZHANG Weiyan JIN Haiyan YAO Xuying JI Zhongqiang ZHANG Xiaoyu YU Xiaoguo ZHANG Fuyuan GAO Aigen | 2015 | Acta Oceanologica Sinica2015，34，10： | 3 |
| 15 | Crustal P-wave velocity structure in the northeastern margin of the Qinghai-Tibetan Plateau and insights into crustal deformation显示文摘The transitional area between the northeastern margin of the Qinghai-Tibetan Plateau, Ordos Block and Alxa Block,also being the northern segment of the North-South Seismic Belt, is characterized by considerably high seismicity level and high risk of strong earthquakes. In view of the special tectonic environment and deep tectonic setting in this area, this study used two seismic wide-angle reflection/refraction cross profiles for double constraining, so as to more reliably obtain the fine-scale velocity structure characteristics in both the shallow and deep crust of individual blocks and their boundaries in the study area,and further discuss the seismogenic environment in seismic zones with strong historical earthquakes. In this paper, the P-wave data from the two profiles are processed and interpreted, and two-dimensional crustal velocity structure models along the two profiles are constructed by travel time forward modeling. The results show that there are great differences in velocity structure,shape of intra-crustal interfaces and crustal thickness among different blocks sampled by the two seismic profiles. The crustal thickness along the Lanzhou-Huianbu-Yulin seismic sounding profile(L1) increases from ~43 km in the western margin of Ordos Block to ~56 km in the Qilian Block to the west. In the Ordos Block, the velocity contours vary gently, and the average velocity of the crust is about 6.30 km s-1; On the other hand, the velocity structures in the crust of the Qilian Block and the arclike tectonic zone vary dramatically, and the average crustal velocities in these areas are about 0.10 km s-1 lower than that of the Ordos Block. In addition, discontinuous low-velocity bodies(LVZ1 and LVZ2) are identified in the crust of the Qilian Block and the arc-like tectonic zone, the velocity of which is 0.10–0.20 km s-1 lower than that of the surroundings. The average crustal thickness of the Ordos Block is consistently estimated to be around 43 km along both Profile L2(Tongchuan-Huianbu-Alashan left banner seismic sounding profile) and Profile L1. In contrast to the gently varying intra-crustal interfaces and velocity contours in the Ordos Block along Profile L1, which is a typical structure characteristic of stable cratons, the crustal structure in the Ordos Block along Profile L2 exhibits rather complex variations. This indicates the presence of significant structural differences in the crust within the Ordos Block. The crustal structure of the Helan Mountain Qilian Block and the Yinchuan Basin is featured by 'uplift and depression' undulations, showing the characteristics of localized compressional deformation.Moreover, there are low-velocity zones with alternative high and low velocities in the middle and lower crust beneath the Helan Mountain, where the velocity is about 0.15–0.25 km s-1 lower than that of the surrounding areas. The crustal thickness of the Alxa Block is about 49 km, and the velocity contours in the upper and middle-lower crust of the block vary significantly. The complex crustal velocity structure images along the two seismic sounding profiles L1 and L2 reveal considerable structural differences among different tectonic blocks, their coupling relationships and velocity structural features in the seismic zones where strong historical earthquakes occurred. The imaging result of this study provides fine-scale crustal structure information for further understanding the seismogenic environment and mechanism in the study area. | Shuaijun WANG Baojin LIU Xiaofeng TIAN Baofeng LIU Xianghui SONG Xiaoguo DENG Yinan SUN Cejun MA Yudong YANG | 2018 | Science China Earth Sciences2018，61，9： | 3 |
| 16 | Fabrication of magnetic multi-template molecularly imprinted polymer composite for the selective and efficient removal of tetracyclines from water显示文摘Antibiotic contamination of the water environment has attracted much attention from researchers because of their potential hazards to humans and ecosystems.In this study,a multi-template molecularly imprinted polymer(MIP)modified mesoporous silica coated magnetic graphene oxide(MGO@MS@MIP)was prepared by the surface imprinting method via a sol-gel process and was used for the selective,efficient and simultaneous removal of tetracyclines(TCs),including doxycycline(DC),tetracycline(TC),chlorotetracycline(CTC)and oxytetracycline(OTC)from water.The synthesized MIP composite was characterized by Fourier transform infrared spectroscopy,transmission electron microscope and thermogravimetric analysis.The adsorption properties of MGO@MS@MIP for these TCs were characterized through adsorption kinetics,isotherms and selectivity tests.The MIP composite revealed larger adsorption quantities,excellent selectivity and rapid kinetics for these four tetracyclines.The adsorption process was spontaneous and endothermic and followed the Freundlich isotherm model and the pseudo-second-order kinetic model.The MGO@MS@MIP could specifically recognize DC,TC,CTC and OTC in the presence of some chemical analogs.In addition,the sorption capacity of the MIP composite did not decrease significantly after repeated application for at least five cycles.Thus,the prepared magnetic MIP composite has great potential to contribute to the effective separation and removal of tetracyclines from water. | Guolong Zeng Yiyang Liu Xiaoguo Ma Yinming Fan | 2021 | Frontiers of Environmental Science & Engineering2021，15，5： | 3 |
| 17 | Noncontrast-enhanced MRI-based Noninvasive Score for Portal Hypertension(CHESS1802):An International Multicenter Study显示文摘Background and Aims:This study aimed to determine the performance of the non-invasive score using noncontrastenhanced MRI(CHESS-DIS score)for detecting portal hy-pertension in cirrhosis.Methods:In this international multicenter,diagnostic study(ClinicalTrials.gov,NCT03766880),patients with cirrhosis who had hepatic venous pressure gradient(HVPG)measurement and noncontrast-enhanced MRI were prospectively recruited from four university hospitals in China(n=4)and Turkey(n=1)between December 2018 and April 2019.A cohort of patients was retrospectively recruited from a university hospital in Italy between March 2015 and November 2017.After segmentation of the liver on fat-suppressed T1-weighted MRI maps,CHESS-DIS score was calculated automatically by an in-house developed code based on the quantification of liver surface nodularity.Results:A total of 149 patients were included,of which 124 were from four Chinese hospitals(training cohort)and 25 were from two international hospitals(validation cohort).A positive correlation between CHESS-DIS score and HVPG was found with the correlation coefficients of 0.36(p<0.0001)and 0.55(p<0.01)for the training and validation cohorts,respectively.The area under the receiver operating characteristic curve of CHESS-DIS score in detection of clinically significant portal hypertension(CSPH)was 0.81 and 0.9 in the training and validation cohorts,respectively.The intra-class correlation coefficients for assessing the inter-and intra-observer agreement were 0.846 and 0.841,respectively.Conclusions:A non-invasive score using noncontrast-enhanced MRI was developed and proved to be significantly correlated with invasive HVPG.Besides,this score could be used to detect CSPH in patients with cirrhosis. | Yanna Liu Tianyu Tang NecatiÖrmeci Yifei Huang Jitao Wang Xiaoguo Li Zhiwei Li Weimin An Dengxiang Liu Chunqing Zhang Changchun Liu Jinqiang Liu Chuan Liu Guangchuan Wang Cristina Mosconi Alberta Cappelli Antonio Bruno Seray Akçalar EmrecanÇelebioğlu EvrenÜstüner Sadık Bilgiç Zeynep Ellik ÖzgünÖmer Asiller Lei Li Haijun Zhang Ning Kang Dan Xu Ruiling He Yan Wang Yang Bu Ye Gu Shenghong Ju Rita Golfieri Xiaolong Qi | 2021 | Journal of Clinical and Translational Hepatology2021，9，6： | 3 |
| 18 | Influence of welding parameters on interface evolution and mechanical properties of FSW Al/Ti lap joints显示文摘Friction stir welding(FSW)was performed to produce Al/Ti lap joints under various welding conditions.More heat was generated when rotational rate increased or traversing rate decreased.Two types of Al/Ti interfaces–mixed interface and diffusive interface–were formed under different welding conditions.The diffusive interface was formed with low heat input,and the mixed interface was formed more heat.The grains at the mixed interface were larger than those at the diffusive interface because of the higher heat input.Moreover,the microstructure of the mixed interface had a lower texture intensity compared with that of the diffusive interface,which was attributed to the enhanced continuous dynamic recrystallization(CDRX).TiAl3 was formed at the diffusive interface.When the interface varied to the mixed interface as heat input increased,TiAl was fomed within the Al/Ti mixture following the formation of TiAl3.In addition,TiAl3 precipitates were observed in the diffusion layer.The hardness value of the mixed interface was higher than 350 HV,due to the larger amount of intermetallic compounds(IMCs).The lap shear strength reached a maximum value of 147 MPa with medium heat input and an interface that exits in a critical state between diffusive and mixed interfaces.All the specimens fractured at the interface,which was attributed to the presence of IMCs. | Mingrun Yu Hongyun Zhao Zhihua Jiang Zili Zhang Fei Xu Li Zhou Xiaoguo Song | 2019 | Journal of Materials Science & Technology2019，35，8： | 2 |
| 19 | Destruction of the Northern Margin of the North China Craton in Mid-Late Triassic: Evidence from Asthenosphere-derived Mafic Enclaves in the Jiefangyingzi Granitic Pluton from the Chifeng Area, Southern Inner Mongolia显示文摘The petrology, geochronology and geochemistry of the mafic enclaves in the Mid-Late Triassic Jiefangyingzi pluton from Chifeng area, southern Inner Mongolia, in China are studied to reveal their petrogenetic relationship with the host pluton. Furthermore, the coeval magmatic assemblage and its petrogenesis on the northern margin of the North China craton(NCC) are studied synthetically to elucidate their tectonic setting and the implications for the destruction of the NCC. Zircon U-Pb dating reveals that the mafic enclaves formed at 230.4 ± 2.2 Ma, which is similar to the age of the host pluton. The most basic mafic enclaves belong to weak alkaline rocks, and they display rare earth element(REE) and trace element normalized patterns and trace element compositions similar to those of ocean island basalt(OIB). In addition, they have positive εNd(t) values(+3.84 to +4.94) similar to those of the Cenozoic basalts on the northern margin of the NCC. All of these geochemical characteristics suggest that the basic mafic rocks originated from the asthenosphere. Petrological and geochemical studies suggest that the Jiefangyingzi pluton and the intermediate mafic enclaves were formed by the mixing of the asthenosphere-derived and crust-derived magmas in different degrees. The Mid-Late Triassic magmatic rocks on the northern margin of the NCC could be classified into three assemblages according to their geochemical compositions: alkaline series, weak alkaline–sub-alkaline series and sub-alkaline series rocks. Petrogenetic analyses suggest that the upwelling of the asthenosphere played an important role in the formation of these Mid-Late Triassic magmatic rocks. Basing on an analysis of regional geological data, we suggest that the northern margin of the NCC underwent destruction due to the upwelling of the asthenosphere during the Mid-Late Triassic, which was induced by the delamination of the root of the collisional orogeny between Sino-Korean and Siberian paleoplates in Late Permian. | LIU Jianfeng LI Jinyi CHI Xiaoguo ZHENG Peixi HU Zhaochu ZHANG Xiaowei | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 2 |
| 20 | Controllable generation of large-scale highly regular gratings on Si films显示文摘The application of femtosecond laser-induced periodic surface texturing has significant potential in medicine,optics,tribology,and biology,among other areas.However,when irradiated by a large intense laser spot,the periodic structures usually exhibit an uncontrollable regularity,forming bifurcated patterns,thus limiting their widespread application.Irregularity originates from numerous independent branching seeds.The usual solution to this problem is to utilize the quasi-direct laser writing technique,that is,by limiting the laser beam size(diameter of<10 wavelengths)and scanning the beam or samples using 2D translation stages.Herein,we demonstrate an optical localization-induced nonlinear competition mechanism to solve this problem,which occurs at a fluence nearly one order of magnitude below the ablation threshold.Owing to the low intrinsic absorption of silicon and ultralow applied fluence,this mechanism ensures the self-selection of a single seed to initiate an array of bifurcated-free gratings under stationary irradiation with a large laser spot(diameter>100 wavelengths).Surprisingly,some unconventional complex patterns,such as radial,annular,and spiral gratings,can also be easily produced by structured light fields with unprecedented regularity.Their diameters reach up to>500μm.Moreover,we can artificially control the initial seeding structure to further improve the regularity of the gratings,defined by dispersion in the ripple orientation angle in their 2D Fourier transform.As a result,the regularity in our experiments produced by a large laser spot is even higher than that scanned by a tiny beam.Controllable and highly regular ripples are beneficial to the structural coloring effects because they arise from the light diffraction by subwavelength gratings. | Jiao Geng Xiaoguo Fang Lei Zhang Guangnan Yao Liye Xu Fengjiang Liu Weiwei Tang Liping Shi Min Qiu | 2021 | Light(Advanced Manufacturing)2021，2，3： | 2 |
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