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| 1 | Hybrid Precoding for mm Wave Massive MIMO Systems with Different Antenna Arrays显示文摘In this paper, the performance of hybrid precoding is investigated for mmWave massive MIMO systems with different antenna arrays. The hybrid precoding with partially connected architecture (PCA) is adopted. The spectral efficiency (SE) and received energy efficiency (EE) are investigated by considering four types of antenna arrays, including uniform linear array (ULA), uniform rectangular planar array (URPA), uniform hexagonal planar array (UHPA), and uniform circular planar array (UCPA), respectively. We focus on analysis at the antenna response vector and utilize the idea of orthogonal matching pursuit algorithm to seek the optimal hybrid precoder. Furthermore, the trade-off of precoding architectures is studied between SE and received EE. Simulation results show that if the uniform planar array antenna is more concentrated, the SE and receive EE will be higher. Considering SE and received EE, the performance of planar arrays outperform linear array. There exist different optimal radio-frequency chain numbers to maximize the SE for planar array and linear array. In addition, the PCA can achieve relatively higher received EE while the SE is close to the fully connected architecture and the full digital architecture. | Qingfeng Ding Yuqian Deng Xinpeng Gao Mengxia Liu | 2019 | China Communications2019，16，10： | 6 |
| 2 | Interaction mechanism of the interface between a deep buried sand and a paleo-weathered rock mass using a high normal stress direct shear apparatus显示文摘In order to evaluate the feasibility of safe mining close to the contact zone under reduced security coal pillar conditions at a coal mine in eastern China, the interaction mechanism of the interface between deep buried sand and a paleo-weathered rock mass was investigated in the laboratory by direct shear testing. A DRS-1 high pressure soil shear testing machine and orthogonal design method were used in the direct shear tests. Variance and range methods were applied to analyze the sensitivity of each factor that has an influence on the mechanical characters of the interface. The test results show that the normal pressure is the main influencing factor for mechanical characteristics of the interface, while the lithological characters and roughness are minor factors; the shear stress against shear displacement curve for the interface shows an overall hyperbola relationship, no obvious peak stress and dilatancy was observed.When the normal pressure is 6 MPa, the shear strengths of interfaces with different roughness are basically the same, and when the normal pressure is more than 8 MPa, the larger the roughness of the interface, the larger will be the shear strength; the shear strength has a better linear relationship with the normal pressure, which can be described by a linear Mohr–Coulomb criterion. | Bai Hanying Li Wenping Ding Qingfeng Wang Qiqing Yang Dongdong | 2015 | International Journal of Mining Science and Technology2015，25，4： | 4 |
| 3 | Effect of Curing Temperature on Intermediate Temperature Properties of Calcium Aluminate Cement Bonded Corundum Castables显示文摘In order to study the effect of the curing temperature on the intermediate temperature properties of calcium aluminate cement bonded corundum castables,the prepared castables were cured at 5,10,25,40 and 50℃,respectively,dried at 110℃ for 24 h and heat treated at 800 and 1100 ℃,respectively.Then the apparent porosity,the cold modulus of rupture and the cold crushing strength were measured.The phase composition of castable matrix specimens treated under the same conditions and the influence of the curing temperature on the intermediate temperature strength of the castables were also analyzed.The results show that with the increase of the curing temperature,the hydration degree of calcium aluminate cement increases,which promotes the uniform distribution of hydration products with AI203 after decomposition,thus enhancing the intermediate temperature strength of castables. | LI Ye LIU Kun DING Dafei WANG Qingfeng FU Xiaohui YE Guotian | 2021 | China's Refractories2021，30，3： | 3 |
| 4 | Modulating the optical and electrical properties of MAPbBr_(3) single crystals via voltage regulation engineering and application in memristors显示文摘Defect density is one of the most significant characteristics of perovskite single crystals(PSCs)that determines their optical and electrical properties,but few strategies are available to tune this property.Here,we demonstrate that voltage regulation is an efficient method to tune defect density,as well as the optical and electrical properties of PSCs.A three-step carrier transport model of MAPbBr_(3) PSCs is proposed to explore the defect regulation mechanism and carrier transport dynamics via an applied bias.Dynamic and steady-state photoluminescence measurements subsequently show that the surface defect density,average carrier lifetime,and photoluminescence intensity can be efficiently tuned by the applied bias.In particular,when the regulation voltage is 20 V(electrical poling intensity is 0.167 Vμm^(−1)),the surface defect density of MAPbBr_(3) PSCs is reduced by 24.27%,the carrier lifetime is prolonged by 32.04%,and the PL intensity is increased by 112.96%.Furthermore,a voltage-regulated MAPbBr_(3) PSC memristor device shows an adjustable multiresistance,weak ion migration effect and greatly enhanced device stability.Voltage regulation is a promising engineering technique for developing advanced perovskite optoelectronic devices. | Jun Xing Chen Zhao Yuting Zou Wenchi Kong Zhi Yu Yuwei Shan Qingfeng Dong Ding Zhou Weili Yu Chunlei Guo | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 5 | Recent progress on lanthanide complexes/clay minerals hybrid luminescent materials显示文摘The unique luminescent performance of lanthanide complexes/clay minerals hybrid materials has been fascinating many researchers for recent decades.It not only retains the excellent luminescent characteristics of lanthanide complexes but also improves the poor stability of the complexes.In this article,we introduce the luminescence mechanism of lanthanide complexes and point out the necessity of their combination with clay minerals.After the analysis of the structure and interlayer environment differences of 1:1-type and 2:1-type clay minerals,the intercalation methods(covalent grafting and ion exchange)appropriate for different clay minerals are summarized with examples.Based on the luminescence characteristics of the hybrid materials,the applications of these materials as luminescent probes in recognition of specific metal cations and molecules,detection of pH value,and temperature are reviewed.Finally,the current problems in the preparation of lanthanide complexes/clay minerals hybrid luminescent materials and shortcomings that need improvement in their performance are analyzed,and the application prospect is forecast. | Ga Zhang Lefu Mei Junjie Ding Ke Su Qingfeng Guo Guocheng Lv Libing Liao | 2022 | Journal of Rare Earths2022，40，9： | 2 |
| 6 | Spectral-Energy Efficiency Tradeoff in Mixed-ADC Massive MIMO Uplink with Imperfect CSI显示文摘An uplink multi-user massive Multiinput multi-output(MIMO) system is considered with a mixed Analog-to-digital converter(ADC) architecture under imperfect Channel state information(CSI). A closed-form approximation for the Spectral efficiency(SE)is derived for a general mixed ADC structure with any resolution profile. To achieve a balance between the SE and receive Energy efficiency(EE) of the system, the ADC resolution profile optimization problem that maximizes a linear combination of the SE and the Base station(BS)receive power consumption is formulated. An algorithm based on gradient search is proposed whose complexity is linear in the number of BS antennas. Numerical results verify that the proposed ADC resolution design largely outperforms the two-level structure especially in the lower SE region and provides more choices than the uniformADC architecture for resolving the SE-EE tradeoff. | DING Qingfeng JING Yindi | 2019 | Chinese Journal of Electronics2019，28，3： | 2 |
| 7 | Experimental Verification on Conversion Mechanism of Calcium Aluminate Cement Hydrates显示文摘Calcium aluminate cement(CAC)is a commonly used binder for refractory castables.There has been a long-running debate on the transformation mechanisms of calcium aluminate cement hydrates through solid-state reaction or solutionprecipitation.In order to demonstrate the conversion mechanism of CaO Al2O310H2O(CAH10)to 3CaO Al2O36H2O(C3AH6)and Al2O33H2O(AH3),the CAC pastes cured at 10℃to produce CAH10 was further cured at 60℃with and without free water.The hydration of the pastes was halted by freezing-drying,and the phases and microstructure of hydrates were investigated by XRD and SEM,respectively.The results indicate that CAH10 converts into C3AH6 and AH3 in water presence at 60℃,but does not transform into C3AH6 and AH3 without water,demonstrating that conversion of CAH10 into C3AH6 and AH3 does not happen through solid-state reaction,but takes place through preceding dissolution of CAH10 and subsequent precipitation of AH3 and C3AH6 from the solution. | ZHANG Yang GU Wenjing LIU Kun DING Dafei WANG Qingfeng YE Guotian | 2019 | China's Refractories2019，28，2： | 2 |
| 8 | Sulfur-and Lead-Isotope Geochemistry of the Balugou Cu-Pb-Zn Skarn Deposit in the Wulonggou Area in the Eastern Kunlun Orogen, NW China显示文摘The small-scale Balugou Cu-Pb-Zn skarn deposit(45 298 tonnages of ore at 0.1% to 3.99% Cu, 0.20% to 0.43% Pb and 0.76% to 10.92% Zn) is located in the Wulonggou area in the eastern Kunlun orogen, NW China. Ore deposition is spatially and temporally related with the pre-collisional Anisian Balugou granites(~244 Ma). The mineralization hosted by the contact between marble beds within the Paleo-Proterozoic Jinshuikou Group and Balugou granites, was structurally and lithologically controlled. The mineralogy of the Balugou deposit includes an early simple skarn mineral gangue(epidote with little diopside) and a late complicated quartz sulfide assemblage(pyrite, pyrrhotite, chalcopyrite, sphalerite, galena, bornite, quartz, carbonate and chlorite). The δ34S values of eighteen sulfides range from-2.1‰ to +2.8 ‰, with an average of +0.07‰, and the calculated δ34SH2S values for H2 S in hydrothermal fluids range from-3.2‰ to +2.4‰, with an average of +0.03‰, suggesting a relatively homogeneous magmatic(±mantle) source, with sulfur produced directly by the Balugou granites. The sixteen sulfides have 206Pb/204 Pb ratios from 18.367 4 to 18.384 1, 207Pb/204 Pb ratios from 15.634 6 to 15.641 5, and 208Pb/204 Pb ratios from 38.455 5 to 38.485 0, which are close to those of K-feldspars from the Balugou granites, but are far away from age-corrected lead isotopic ratios of six wall-rock samples. So it was considered that the Pb sources of sulfides must be almost derived from the Balugou granites rather than the older wall-rocks. Collectively, it's suggested that the Balugou Cu-Pb-Zn deposit belongs to skarn deposit, and the sulfur and lead deposited in it were leached from the Anisian Balugou granites. | Qingfeng Ding Wei Yan Benlong Zhang | 2016 | Journal of Earth Science2016，27，5： | 2 |
| 9 | Outage Probability and Achievable Rate Analysis for Massive MIMO Downlink with Mixed-DAC and MF Precoding显示文摘This paper analyses of the outage probability and the achievable rate of massive multi-input-multi-output(MIMO) systems, in which the base station(BS) is equipped with digital-to-analog-converters(DACs) of mixed-level resolution. And the matched-filter(MF) precoding is used on the BS. Closedform expressions are derived by the distribution of user-interference power and other statistical properties in the signal-to-interference-plus-noise-ratio. Then, the combination of mixed-DACs resolution profile is chosen about outage probability and achievable rate with the BS energy consumption. And the resolution configurations between the outage probability and the achievable rate and the BS energy consumption are given. Meanwhile, Effects of related parameters and channel errors are analysed about outage probability and achievable rate. The numerical results show that the correctness of the formula derivations. As the number of users increases the system's achievable rate increases and the outage probability decreases. The selected resolution configuration system has better comprehensive performance. | Qingfeng Ding Hui Shi Yichong Lian | 2020 | China Communications2020，17，8： | 2 |
| 10 | Development of a roll-bonded UNS N08825 alloy clad pipeline steel in Baosteel显示文摘In this study,a roll-bonded UNS N088225 alloy clad pipeline steel was investigated and developed in Baosteel. Based on the requirements of a number of potential projects,we performed a series of strict evaluations including mechanical and corrosion tests. The results show the mechanical properties and corrosion resistance of this clad steel to be excellent and to meet the requirements of all the design parameters. | LIANG Xiaojun MA Tianjun FU Yanhong JIAO Sihai DING Jianhua YUAN Xiangqian WANG Baosen ZHANG Qingfeng | 2017 | Baosteel Technical Research2017，11，1： | 1 |
| 11 | Investigation on fouling behaviors of low-energy surface and fouling fractal characteristics 显示文摘 | Yang Qingfeng Ding Jie Shen Ziqiu | 2000 | Chemical Engineering Science2000，55，： | 1 |
| 12 | Comparison of outcomes between immediate implantbased and autologous reconstruction: 15-year, single-center experience in a propensity score-matched Chinese cohort显示文摘Objective:The number of immediate breast reconstruction(IBR)procedures has been increasing in China.This study aimed to investigate the oncological safety of IBR,and to compare the survival and surgical outcomes between implant-based and autologous reconstruction.Methods:Data from patients diagnosed with invasive breast cancer who underwent immediate total breast reconstruction between 2001 and 2016 were retrospectively reviewed.Long-term breast cancer-specific survival(BCSS),disease-free survival(DFS),and locoregional recurrence-free survival(LRFS)were evaluated.Patient satisfaction with the breast was compared between the implantbased and autologous groups.BCSS,DFS,and LRFS were compared between groups after propensity score matching(PSM).Results:A total of 784 IBR procedures were identified,of which 584 were performed on patients with invasive breast cancer(implantbased,n=288;autologous,n=296).With a median follow-up of 71.3 months,the 10-year estimates of BCSS,DFS,and LRFS were 88.9%[95%confidence interval(CI)(85.1%–93.0%)],79.6%[95%CI(74.7%–84.8%)],and 94.0%[95%CI(90.3%–97.8%)],respectively.A total of 124 patients completed the Breast-Q questionnaire,and no statistically significant differences were noted between groups(P=0.823).After PSM with 27 variables,no statistically significant differences in BCSS,DFS,and LRFS were found between the implant-based(n=177)and autologous(n=177)groups.Further stratification according to staging,histological grade,lymph node status,and lymph-venous invasion status revealed no significant survival differences between groups.Conclusions:Both immediate implant-based and autologous reconstruction were reasonable choices with similar long-term oncological outcomes and patient-reported satisfaction among patients with invasive breast cancer in China. | Shanshan He Bowen Ding Gang Li Yubei Huang Chunyong Han Jingyan Sun Qingfeng Huang Jing Liu Zhuming Yin Shu Wang Jian Yin | 2022 | Cancer Biology & Medicine2022，19，9： | 1 |
| 13 | Characterization and life prediction of single-pass honing tool for fuel injection nozzle显示文摘Single-pass honing is an important machining method for finish machining of holes,which can meet the requirement for high efficiency and consistency of holes.Characterization and life prediction of single-pass honing tool are necessary to improve the machining accuracy of holes honed,especially dimension accuracy.Single-pass honing tool is a single layer abrasive tool with fixed dimension,which still remains problematic for characterization and life prediction.For fuel injection nozzles with bore diameter under 1 mm,the stiffness of the single-pass honing tool is poor.This article presents a novel analytical model that predicts life of the tool with poor stiffness.Firstly,according to the bore diameter and dimension tolerance,the single-pass honing tool is designed and manufactured.Based on the prepared single-pass honing tool,the measurement and characterization methods are established.Furthermore,the tool wear tests are carried out,and the tool contour evolution model is established to predict the tool life. | Changyong YANG Hao SU Shaowu GAO Qingfeng AI Yucan FU Wenfeng DING Jiuhua XU | 2021 | Chinese Journal of Aeronautics2021，34，4： | 1 |
| 14 | Late Cretaceous K-rich rhyolitic crystal tuffs from the Chuduoqu area in Eastern Qiangtang subterrane:evidence for crustal thickening of the central Tibetan Plateau prior to India–Asia collision显示文摘In order to constrain whether the Lhasa–Qiangtang collision contributed to an early crustal thickening of the central Tibetan Plateau prior to the India–Asia collision,we present zircon LA–ICP–MS U–Pb ages,wholerock geochemistry,and zircon Hf isotopic compositions of the newly discovered rhyolitic crystal tuffs from the Chuduoqu area in the eastern Qiangtang subterrane,central Tibet.Zircon U–Pb dating suggests that the Chuduoqu rhyolitic crystal tuffs were emplaced at ca.68 Ma.The Chuoduoqu rhyolitic crystal tuffs display high SiO_(2) and K2 O,and low MgO,Cr,and Ni.Combined with their zircon Hf isotopic data,we suggest that they were derived from partial melting of the juvenile lower crust,and the magma underwent fractional crystallization and limited upper continental crustal assimilation during its evolution prior to eruption.They should be formed in a post-collisional environment related to lithospheric mantle delamination.The Chuduoqu rhyolitic crystal tuffs could provide important constraints on the Late Cretaceous crustal thickening of the central Tibetan Plateau caused by the Lhasa–Qiangtang collision. | Yonggang Sun Bile Li Fengyue Sun Qingfeng Ding Junlin Dong Ye Qian Yujin Li Zhen Yao | 2022 | Acta Geochimica2022，41，1： | 0 |
| 15 | Static Bending Creep Properties of Glass Fiber Surface Composite Wood显示文摘To study the static bending creep properties of glass fiber reinforced wood,glass fiber reinforced poplar(GFRP)specimens were obtained by pasting glass fiber on the upper and lower surfaces of Poplar(Populus euramevicana,P),the performance of Normal Creep(NC)and Mechanical Sorptive Creep(MSC)of GFRP and their influencing factors were tested and analyzed.The test results and analysis show that:(1)The MOE and MOR of Poplar were increased by 17.06%and 10.00%respectively by the glass fiber surface reinforced composite.(2)The surface reinforced P with glass fiber cloth only exhibits the NC pattern of wood and loses the MSC characteristics of wood,regardless of the constant or alternating changes in relative humidity.(3)The instantaneous elastic deformation,viscoelastic deformation,viscous deformation and total creep deflection of GFRP are positively correlated with the stress level of the external load applied to the specimen.Still,the specimen’s creep recovery rate is negatively correlated with the stress level of the external load applied to the specimen.The static creep deflection and viscous deformation of GFRP increase with the increase of the relative humidity of the environment.(4)The MSC maximum creep deflection of GFRP increased by only 7.41%over the NC maximum creep deflection,but the MSC maximum creep deflection of P increased by 199.25%over the NC maximum creep deflection.(5)The Burgers 4-factor model and the Weibull distribution equation can fit the NC and NC recovery processes of GFRP well. | Shang Zhang Jie Wang Benjamin Rose Yushan Yang Qingfeng Ding Bengang Zhang Chunlei Dong | 2023 | Journal of Renewable Materials2023，11，6： | 0 |
| 16 | Modification Mechanism and Uniaxial Fatigue Performances of A356.2 Alloy Treated by Al-Sr-La Composite Refinement-Modification Agent显示文摘Modification mechanism and uniaxial fatigue properties of A356.2 alloy treated by Al-6Sr-7La and traditional Al-5Ti-1B/Al-10Sr(hereinafter refers to traditional treated alloy) were investigated by constant stress amplitude method. Microstructure, dislocation and Si twinning of the alloys were studied by thermal analysis, scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results showed that Al-6Sr-7La possesses better refining and modification effect than Al-5Ti-1B/Al-10Sr. Meanwhile, fatigue properties of the alloy treated by Al-6Sr-7La are higher than traditional treated alloy, and this is mainly owing to that Al-6Sr-7La treated alloy has more twins in eutectic Si and lower twin spacing. In addition, higher density of nanophases formed on twin faces and La-rich clusters appear at multiple twin intersections. Stacking faults and entrapped nanophases appeared on growing Si twin faces. Impurity induced twinning(IIT) mechanism and twin plane re-entrant edge(TPRE) mechanism are valid for eutectic Si which are important for mechanical optimization of A356.2 alloy. | Liang Chang Qingfeng Zhao Xingchuan Xia Yuming Ding Binxu Guo Jian Ding Ying Tang Zan Zhang Chong Li Xiaomian Sun Junjie Guo Kaihong Song Yongchang Liu | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，6： | 0 |
| 17 | Surveillance of Multidrug-Resistant Bacterial Infections in Non-Adult Patients-Zhejiang Province,China,2014-2019显示文摘ABSTRACT Introduction:Antimicrobial resistance has become a major public health threat globally.The prevalence of multidrug-resistant(MDR)bacterial infections increased substantially among inpatients under 18 years of age in recent years.In Zhejiang Province,China,the trends of drug-resistance in non-adult patients from 2014 to 2019 were monitored,aiming to determine the variation patterns and epidemiological features of MDR strains. | Yuchen Wu Shi Chen Jiaping Li Chang Cai Hanyu Wang Mingming Zhou Junmin Cao Qiang Wang Shenghai Wu Shibiao Ding Xiaofei Zhao Long Sun Qingfeng Hu Hongwei Zhou Xiang Qian Qing Yang Sheng Chen Rong Zhang | 2021 | China CDC weekly2021，3，47： | 0 |
| 18 | INCloud:integrated neuroimaging cloud for data collection,management,analysis and clinical translations显示文摘Background Neuroimaging techniques provide rich and accurate measures of brain structure and function,and have become one of the most popular methods in mental health and neuroscience research.Rapidly growing neuroimaging research generates massive amounts of data,bringing new challenges in data collection,large-scale data management,efficient computing requirements and data mining and analyses.Aims To tackle the challenges and promote the application of neuroimaging technology in clinical practice,we developed an integrated neuroimaging cloud(INCloud).INCloud provides a full-stack solution for the entire process of large-scale neuroimaging data collection,management,analysis and clinical applications.Methods INCloud consists of data acquisition systems,a data warehouse,automatic multimodal image quality check and processing systems,a brain feature library,a high-performance computing cluster and computer-aided diagnosis systems(CADS)for mental disorders.A unique design of INCloud is the brain feature library that converts the unit of data management from image to image features such as hippocampal volume.Connecting the CADS to the scientific database,INCloud allows the accumulation of scientific data to continuously improve the accuracy of objective diagnosis of mental disorders.Results Users can manage and analyze neuroimaging data on INCloud,without the need to download them to the local device.INCloud users can query,manage,analyze and share image features based on customized criteria.Several examples of'mega-analyses'based on the brain feature library are shown.Conclusions Compared with traditional neuroimaging acquisition and analysis workflow,INCloud features safe and convenient data management and sharing,reduced technical requirements for researchers,high-efficiency computing and data mining,and straightforward translations to clinical service.The design and implementation of the system are also applicable to imaging research platforms in other fields. | Qingfeng Li Lijuan Jiang Kaini Qiao Yang Hu Bing Chen Xiaochen Zhang Yue Ding Zhi Yang Chunbo Li | 2021 | General Psychiatry2021，34，6： | 0 |
| 19 | Strategy for Synthesizing Novel Acetamidines as CO_2-Triggered Switchable Surfactants via Acetimidates显示文摘In this study, we developed a strategy for using the Scoggins procedure in the synthesis of acetamidines as novel C02-triggered switchable surfactants via acetimidates by effectively tuning the chemical equilibrium. The as-synthesized N'-alkyl-N,Ndiethylacetamidines exhibit excellent CO_2/N_2 switchability and their bicarbonate salts have the ability to emulsify oil-water mixtures. | Yan Xu Fan Wang Qingfeng Hou Yujun Zhao Guosheng Ding Xingguang Xu | 2019 | Transactions of Tianjin University2019，25，3： | 0 |
| 20 | Geology and fluid inclusion characteristics of Qilishan gold deposit in Zhaoyuan of Shandong,China显示文摘The Qilishan gold deposit is located in the southern Zhaolai gold ore belt in the northwestern Jiaodong region.A total of seven gold ore bodies have been found in the mining area.Linglong gneissic biotite granite and the NE trending Lingbei fracture control the output and distribution of the gold deposit.The ore bodies with veined or irregular shape occur in the structural alteration zone.The ore bodies of different sizes are NE trending and SE dipping.The constituent minerals of the ores mainly include pyrite,chalcopyrite,native gold,electrum,argentite,matildite,hematite,quartz and calcite.The ores are characterized by metasomatic dissolution structure,as well as veined and brecciated structures.The ore-forming process is divided into four stages,namely quartz-,pyrite-,polymetallic-and carbonate stages.Study on fluid inclusion shows that the deposit is composed of gas-liquid two-phase inclusions(I)and three-phase inclusions containing CO2(II),and that the former dominates.The homogenization temperature is 259.6℃--373.7℃;the salinity of three-phase inclusions containing CO2is 5.77%--9.84%(NaCl);the salinity of gas-liquid two-phase inclusions is 6.58%--8.54%(NaCl);and the estimated ore-forming pressure is 55.2--82.2 MPa.According to the nonlinear relationship between the depth and pressure of the fluid in the fracture zone,the ore-forming depth of the Qilishan gold deposit is calculated as 5.95--7.14 km.It is preliminarily determined that the deposit is a mesophilic and hypothermal gold deposit. | SONG Zilong DING Qingfeng ZHANG Yuan | 2013 | Global Geology2013，16，4： | 0 |
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