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| 1 | Vegetation change detection research of Dunhuang city based on GF-1 data显示文摘 | Zhaopeng Zhang Zengyuan Li Xin Tian | 2018 | International Journal of Coal Science & Technology2018，5，1： | 7 |
| 2 | Settling behavior of non-spherical particles in power-law fluids:Experimental study and model development显示文摘Solid-particle settling occurs in many natural and industrial processes, such as in the transportation of drilling cuttings and fracturing proppant. Knowledge of the drag coefficient and settling velocity of cuttings and proppant is of significance to hydraulics design, wellbore cleanout, and fracture optimization. We conducted 553 tests to investigate the settling characteristics of spherical and non-spherical particles in power-law fluids. Three major particle shapes (spherical, cubic, and cylindrical) and eight different particle sphericities were used to simulate cuttings and proppant, and power-law fluids were applied to simulate drilling and fracturing fluids. Based on the data analysis, a new drag coefficient-particle Reynolds number correlation was developed to determine the drag coefficient in a power-law fluid for spherical and non-spherical particles. The drag coefficient increases as the sphericity decreases for the same particle Reynolds number. For a specific particle shape, the drag coefficient decreases as the particle Reynolds number increases, but the decreasing trend is reduced at high particle Reynolds number conditions. An explicit settling-velocity equation was proposed to calculate the settling velocity of spherical and non-spherical particles in power-law fluids by considering the effect of sphericity. A suitable range for the proposed model is 0.0001 < Re <200, 0.471 <φ< 1, and 0.505 < n < 1. An illustrative example is presented to show how to calculate the drag coefficient and settling velocity in power-law fluids with given particle and fluid properties. | Zhengming Xu Xianzhi Song Gensheng Li Zhaoyu Pang Zhaopeng Zhu | 2019 | Particuology2019，17，5： | 6 |
| 3 | Analysis of Frequency Characteristics and Sensitivity of Compliant Mechanisms显示文摘Based on a modified pseudo-rigid-body model,the frequency characteristics and sensitivity of the large-deformation compliant mechanism are studied.Firstly,the pseudo-rigid-body model under the static and kinetic conditions is modified to enable the modified pseudo-rigid-body model to be more suitable for the dynamic analysis of the compliant mechanism.Subsequently,based on the modified pseudo-rigid-body model,the dynamic equations of the ordinary compliant four-bar mechanism are established using the analytical mechanics.Finally,in combination with the finite element analysis software ANSYS,the frequency characteristics and sensitivity of the compliant mechanism are analyzed by taking the compliant parallel-guiding mechanism and the compliant bistable mechanism as examples.From the simulation results,the dynamic characteristics of compliant mechanism are relatively sensitive to the structure size,section parameter,and characteristic parameter of material on mechanisms.The results could provide great theoretical significance and application values for the structural optimization of compliant mechanisms,the improvement of their dynamic properties and the expansion of their application range. | LIU Shanzeng DAI Jiansheng LI Aimin SUN Zhaopeng FENG Shizhe CAO Guohua | 2016 | Chinese Journal of Mechanical Engineering2016，29，4： | 5 |
| 4 | Numerical simulation of spatial distributions of mining-induced stress and fracture fields for three coal mining layouts显示文摘In this study, the spatial distributions of stress and fracture fields for three typical underground coal mining layouts, i.e. non-pillar mining(NM), top-coal caving mining(TCM) and protective coal-seam mining(PCM), are modeled using discrete element software UDEC. The numerical results show that different mining layouts can lead to different mining-induced stress fields, resulting in diverse fracture fields. For the PCM, the mining influenced area in front of the mining faces is the largest, and the stress concentration factor in front of the mining faces is the lowest. The spatial shapes of the mining-induced fracture fields under NM, TCM and PCM differ, and they are characterized by trapezoidal, triangular and tower shapes, respectively. The fractal dimensions of mining-induced fractures of the three mining layouts decrease in the order of PCM, TCM and NM. It is also shown that the PCM can result in a better gas control effect in coal mines with high outburst potential. The numerical results are expected to provide a basis for understanding of mining-induced gas seepage fields and provide a reference for highefficiency coal mining. | Shengwei Li Mingzhong Gao Xiaojun Yang Ru Zhang Li Ren Zhaopeng Zhang Guo Li Zetian Zhang Jing Xie | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，5： | 3 |
| 5 | Comparison and analysis of three estimation methods for soil carbon sequestration potential in the Ebinur Lake Wetland,China显示文摘Based on soil under seven vegetation types,the carbon sequestration potential in the Ebinur Lake wetland was estimated using the maximum value method,the saturation value method,and the classification and grading method.Results indicated that:1)Soil carbon sequestration results for the top 20 cm soil layer were about 1.88 Mt using the maximum value method;the middle level standard of the classification and grading method result was 1.71 Mt.2)Soil carbon sequestration potential in the top 20 cm layer under different vegetation types,evaluated using the saturation value method and the classificationgrading method,ranged from 0.45 to 0.67 Mt,accounting for about 5/16 of the ideal carbon sequestration potential.3)Carbon sequestration potential calculated using the saturation method and the classification method(middle level standard),combining the soil organic carbon increment under different vegetation types in Ebinur Lake wetland,recorded an average growth rate of soil organic carbon around 0.7-1 kg/(hm^2·a).Time required to reach its carbon sequestration potential was 41 to 144 a.These results indicate that soil organic carbon content dynamically changes,and different forms of land use affect soil organic carbon content.The potential and ability of soil carbon sequestration and its mechanism of dynamic change are investigated,providing a scientific basis for understanding regional carbon cycle and climate change in wetlands. | Yonghui WANG Kexiang LIU Zhaopeng WU Li JIAO | 2020 | Frontiers of Earth Science2020，14，1： | 2 |
| 6 | Improving Semantic Part Features for Person Re-identification with Supervised Non-local Similarity显示文摘In person re-IDentification (re-ID) task,the learning of part-level features benefits from fine-grained information.To facilitate part alignment,which is a prerequisite for learning part-level features,a popular approach is to detect semantic parts with the use of human parsing or pose estimation.Such methods of semantic partition do offer cues to good part alignment but are prone to noisy part detection,especially when they are employed in an off-the-shelf manner.In response,this paper proposes a novel part feature learning method for re-ID,that suppresses the impact of noisy semantic part detection through Supervised Non-local Similarity (SNS) learning.Given several detected semantic parts,SNS first locates their center points on the convolutional feature maps for use as a set of anchors and then evaluates the similarity values between these anchors and each pixel on the feature maps.The non-local similarity learning is supervised such that:each anchor should be similar to itself and simultaneously dissimilar to any other anchors,thus yielding the SNS.Finally,each anchor absorbs features from all of the similar pixels on the convolutional feature maps to generate a corresponding part feature (SNS feature).We evaluate our method with extensive experiments conducted under both holistic and partial re-ID scenarios.Experimental results confirm that SNS consistently improves re-ID accuracy using human parsing or pose estimation,and that our results are on par with state-of-the-art methods. | Yifan Sun Zhaopeng Dou Yali Li Shengjin Wang | 2020 | Tsinghua Science and Technology2020，25，5： | 2 |
| 7 | Evidence for a Dirac nodal-line semimetal in SrAs_3显示文摘Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs_3.We obtain the nontrivial ∏ Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly.Accompanying first-principles calculations identifies that a single hole pocket enclosing the loop nodes is responsible for these observations. | Shichao Li Zhaopeng Guo Dongzhi Fu Xing-Chen Pan Jinghui Wang Kejing Ran Song Bao Zhen Ma Zhengwei Cai Rui Wang Rui Yu Jian Sun Fengqi Song Jinsheng Wen | 2018 | Science Bulletin2018，63，9： | 2 |
| 8 | Settling behavior of spherical particles in vertical annulus:Experimental study and model development显示文摘Coiled tubing(CT)drilling technology offers significant advantages in terms of cost and efficiency for exploitations of unconventional oil and gas resources.However,the development of CT drilling technol-ogy is restricted by cuttings accumulation in the wellbore due to non-rotation of the drill string and limited circulating capacity.Cuttings cleaning becomes more difficult with the wall resistance of pipe-wellbore annulus on the cutting transport.Accurate description of particle transport process in the pipe-wellbore annulus is,therefore,important for improving the wellbore cleanliness.In this study,high-speed cam-era is used to record and analyze the settling process of particles in the transparent annulus filled with power-law fluids.A total of 540 tests were carried out,involving dimensionless diameters of 0.10-0.95 and particle Reynolds Numbers of 0.01-12.97,revealing the effect of the dimensionless diameter and particle Reynolds number on the annulus wall effect,and the wall factor model with an average relative error of2.75%was established.In addition,a dimensionless parameter,Archimedes number,independent of the settling velocity,was introduced to establish an explicit model of the settling velocity of spherical particles in the vertical annulus,with the average relative error of 7.89%.Finally,a calculation example was provided to show how to use the explicit model of settling velocity in annulus.The results of this study are expected to provide guidance for field engineers to improve the wellbore cleanliness of coiled tubing drilling. | Zhaopeng Zhu Mengmeng Zhou Xianzhi Song Shuo Zhu Gensheng Li Zhengming Xu Xuezhe Yao Buwen Yu | 2022 | Particuology2022，20，9： | 2 |
| 9 | Radiation pre-vulcanization effect on properties of the truck tyre's transition layer and the truck tyre显示文摘In this paper,the natural rubber is chosen as the main constituents for the transition layer of all-steel load radial tyre,which is pre-vulcanized by 500-keV E-beam irradiation of up to 60 kGy.The results show that the green strength of transitional layer increases with the dose,reaching four times as much as the control(without irradiation) at 60 kGy.The final mechanical properties do not differ significantly from those of the control except that the aging and fatigue performance increased.However,thickness of the natural rubber transitional layer for an average single tyre can be reduced by 1 mm(or 1.5 kg) without obvious adverse effect on tyre performance. | YANG Mingcheng ZHANG Benshang ZHU Jun LI Zhaopeng LI Kunhao GUO Dongquan ZHANG Hongna | 2013 | Nuclear Science and Techniques2013，24，2： | 2 |
| 10 | Intelligent Drilling and Completion:A Review显示文摘The application of artificial intelligence(AI)has become inevitable in the petroleum industry.In drilling and completion engineering,AI is regarded as a transformative technology that can lower costs and significantly improve drilling efficiency(DE),In recent years,numerous studies have focused on intelligent algorithms and their application.Advanced technologies,such as digital twins and physics-guided neural networks,are expected to play roles in drilling and completion engineering.However,many challenges remain to be addressed,such as the automatic processing of multi-source and multi-scale data.Additionally,in intelligent drilling and completion,methods for the fusion of data-driven and physicsbased models,few-sample learning,uncertainty modeling,and the interpretability and transferability of intelligent algorithms are research frontiers.Based on intelligent application scenarios,this study comprehensively reviews the research status of intelligent drilling and completion and discusses key research areas in the future.This study aims to enhance the berthing of AI techniques in drilling and completion engineering. | Gensheng Li Xianzhi Song Shouceng Tian Zhaopeng Zhu | 2022 | Engineering2022，，11： | 2 |
| 11 | The variations of the Martian exobase altitude显示文摘The exobase is defined as the interface between the strongly collisional and the collisionless parts of an atmosphere. Although in reality the exobase is a transition region of finite depth, it is conventionally defined as the boundary above which an upwardly ejected neutral particle makes one collision at higher altitudes. Such an idealized definition is of practical use and serves as a good tracer of the overall size of an atmosphere as it expands and contracts under the influences of both external and internal sources. Knowledge of the atmospheric properties near the exobase is crucial to first-order estimates of atmospheric escape rates on terrestrial planets. Since its arrival at Mars on 21 September 2014, the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft has provided comprehensive maps of the Martian upper atmosphere under a variety of conditions. This allows, for the first time, a thorough investigation of the variations of the exobase altitude on this red planet. In this study, we use the N2 density measurements accumulated by MAVEN’s Neutral Gas and Ion Mass Spectrometer from October 2014 to November 2018 to determine the exobase altitudes for a large number of MAVEN orbits. Our analysis reveals clearly the variations of exobase altitude with local time and solar extreme ultraviolet (EUV) flux, as well as tentative evidence for the impact of global dust storms. These observations are indicative of thermal expansion of the Martian upper atmosphere, driven either externally by solar EUV energy deposition or internally by global dust storms. | MengHao Fu Jun Cui XiaoShu Wu ZhaoPeng Wu Jing Li | 2020 | Earth and Planetary Physics2020，4，1： | 2 |
| 12 | Improved thermostability and the optimum temperature of Rhizopus arrhizus lipase by directed evolution显示文摘 | Niu Weining Li Zhaopeng Zhang Dawei | 2006 | Journal of Molecular Catalysis B: Enzymatic2006，43，： | 1 |
| 13 | Sulfur-resistant methanation over MoO_3/CeO_2–ZrO_2 catalyst: Influence of Ce-addition methods显示文摘In this paper, Ce_(0.2)Zr_(0.8)O_2 composite supports were prepared by different Ce-addition methods including impregnation of cerium(CeZr-imp), impregnation of citric acid and cerium(CeZr-CA) simultaneously and deposition precipitation method(CeZr-DP), respectively. The as-prepared supports were applied to prepare 10 wt% MoO_3/Ce_(0.2)Zr_(0.8)O_2 catalysts for sulfur-resistant methanation. The N_2 adsorption/desorption,X-ray diffraction(XRD), Raman spectroscopy(RS), X-ray photoelectron(XPS), temperature-programmed reduction by hydrogen(H_2-TPR) were undertaken to get textural properties, morphological information and structures of the catalysts. The results showed that Mo O_3 was highly dispersed on the surface of these three supports and Ce was mostly of coexisted in Ce^(4+)/Ce^(3+) redox pairs. Compared with Mo/CeZrimp, the CO conversion increased by 10% and 15% for Mo/CeZr-CA and Mo/CeZr-DP, respectively. This was mainly attributed to the larger specific surface area, Ce^(3+) concentration and content of active MoS_2 on the surface of catalysts. | Zhaopeng Liu Yan Xu Zhenhua Li Baowei Wang Weihan Wang Xinbin Ma Renjie Liu | 2019 | Journal of Energy Chemistry2019，28，1： | 1 |
| 14 | A pointer logic and certifying compiler显示文摘 | Yiyun Chen Lin Ge Baojian Hua Zhaopeng Li Cheng Liu Zhifang Wang | 2007 | Frontiers of Computer Science in China2007，，3： | 1 |
| 15 | Ubiquinone-10 production using Agrobacterium tumefaciens dps Gene in Escherichia coli by Coexpression System 显示文摘 | Zhang Dawei Shrestha Binaya Li Zhaopeng | 2007 | Molecular Biotechnology2007，35，1： | 1 |
| 16 | Properties and Hydration Mechanism of Cementitious Materials Prepared from Calcined Coal Gangue显示文摘The preparation of cementitious materials by replacing part of the cement with activated coal gangue is of great significance to the cement industry in terms of carbon reduction and coal-based solid waste utilization.For this paper,cementitious material was prepared by firing activated coal gangue under suspension conditions and batching it with limestone powder using Inner Mongolia coal gangue as raw material.The optimal ratio was determined by testing the strength changes of the cementitious material at 3,7,and 28 days of hydration,and the hydration process and mechanism were explored by combining the pore structure,heat of hydration,chemical composition,phase composition,and microscopic morphological characteristics of the hydration products.The results showed that the active materials formulated from activated gangue and limestone powder can be used to prepare cementitious materials with good performance at the level of 30%–50%replacement of cement.The optimal ratio was 30%replacement of cement,and the mass ratio of calcined gangue to limestone powder was 2:1.The 3 days compressive strength of this ratio was 28.8 MPa,which was only slightly lower than that of cement.However,the 28 days compressive strength of samples reached 67.5 MPa,which was much higher than that of the reference cement.In the hydration of this cementitious material,not only does the activated coal gangue react with the Ca(OH)_(2)formed by hydration to form C–S–H gel,but CaCO3 also participates in the reaction to form a new phase of carbon aluminate,and the two effects together promote the development of the later strength of the samples.This paper can provide a reference for carbon reduction in the cement production process and comprehensive utilization of coal gangue. | Zhaopeng Wang Shaowu Jiu Hui Li Kaifeng Zhang Simeng Cheng | 2023 | Journal of Renewable Materials2023，11，3： | 1 |
| 17 | Improved thermo- stability and the optimum temperature of Rhizopus arrhizus lipase by directed evolution显示文摘 | Weining Niu Zhaopeng Li Dawei Zhang | 2006 | Journal of Molecular Catalysis B: Enzy- matic2006，43，14： | 1 |
| 18 | L-Lactic acid production by Lactobacillus casei fermentation with corn steep liquor-supplemented acid-hydrolysate of soybean meal显示文摘 | LI Zheng DING Shaofeng LI Zhaopeng | 2006 | Biotechnology Journal2006，1，： | 1 |
| 19 | Cavitation dis- tribution within large phantom vessel and mechanical dam- age formed on surrounding vessel wall 显示文摘 | Yangzi Qiao Hui yin Zhaopeng Li | 2013 | Ultrasonics Sonochemistry2013，20，： | 1 |
| 20 | A combined interfacial and in-situ polymerization strategy to construct well-defined core-shell epoxy-containing SiO_(2) - based microcapsules with high encapsulation loading, super thermal stability and nonpolar solvent tolerance显示文摘SiO_(2)-based microcapsules containing hydrophobic molecules exhib-ited potential applications such as extrinsic self-healing,drug delivery,due to outstanding thermal and chemical stability of SiO_(2).However,to construct SiO_(2)-based microcapsules with both high encapsulation loading and long-term structural stability is still a troublesome issue,limiting their further utilization.We herein design asingle-batch route,a combined interfacial and in-situ polymerization strategy,to fabricate epoxy-containing SiO_(2)-based microcapsules with both high encapsu-lation loading and long-term structural stability.The final SiO_(2)-based microcapsules preserve high encapsulation loading of 85.7 wt% by controlling exclusively hydrolysis and condensed polymerization at oil/water interface in the initial interfacial polymerization step.In the subsequent in-situ polymerization step,the initial SiO_(2)-based microcapsules as seeds could efficiently harvest SiO_(2) precursors and primary SiO 2 particles to finely tune the SiO_(2) wall thickness,thereby enhancing long-term structural stability of the final SiO_(2)-based microcapsules including high thermal stability with almost no any weight loss until 250℃,and strong tolerance against nonpolar solvents such as CCl_(4) with almost unchanged core-shell structure and unchanged core weight after immersing into strong solvents for up to 5 days.These SiO_(2)-based microcapsules are extremely suited for processing them into anticorrosive coating in the presence of nonpolar solvents for self-healing application. | Yin Jia Haiyan Wang Kesong Tian Ruifei Li Zhaopeng Xu Jiao Jiao Ling Cao Yuehao Wu | 2016 | International Journal of Smart and Nano Materials2016，7，4： | 0 |
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