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Multi-dimensional characteristic construction methods of computational materials under big data environment

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ChemPhysMater 2022年第3期1卷 183-194页

作者： Lihao chen Shuopu Wang chen zou Ben Xu Ke Bi State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Graduate School China Academy of Engineering PhysicsBuilding 9Beijing 100193China

Characteristic construction is an important part of material data *** the big data environment,the de-velopment of material data science will have implications for multidimensional data analysis *** these,the machine learning method for multidimensional data models can be widely applied to material data types,including element ratios,atomic compositions,electronic arrangements,molecular structures,and energy *** high-throughput computing materials,it is recommended in material data science to judge and extract the main characteristics influencing material properties and predict novel functional materials us-ing the discovered ***,we considere the characteristic construction,learning prediction,feature extraction,and high-order analysis of computational materials as the main research purposes,and construct a composite analysis model of the material system by combining data preprocessing,data mining,data evaluation,and knowledge representation as the main steps of data *** demonstrates that a method to comprehen-sively judge the properties of materials by constructing the characteristics of materials in different dimensions is essential.

关键词： Material characterization Feature extraction High-order analysis Data mining Machine learning

Variability of Prorocentrum donghaiense response to allelopathic action from Alexandrium pacificum in laboratory culture

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Journal of Oceanology and Limnology 2021年第4期39卷 1305-1315页

作者： Hongjia HUANG Chuqiao GAN Jiahui HUANG chen zou Hongye LI Jiesheng LIU Weidong YANG Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institute College of Life Science and TechnologyJinan UniversityGuangzhou 510632China

The dinoflagellates Alexandrium pacificum and Prorocentrum donghaiense are two well-known harmful algal blooms(HABs)-forming species,both were usually found in the same sea areas in form of HABs in *** date,there is no mechanistic model that can fully explain the occurrence of *** blooms with *** found that different strains of *** had different intrinsic growth rates of 0.107-0.215/d,and these strains exhibited different responses to the allelopathic action from *** strains of *** could grow well despite some degrees of inhibition in a short period,suggesting the two algal species *** and *** could coexist,even if *** was *** findings may advance the understanding of phenotypes in *** and provide a potential mechanism involved in the coexistence of *** and *** in the same area.

关键词： Prorocentrum donghaiense allelopathy Lotka-Volterra model algal bloom phenotype

Investigation of high extraction efficiency flip-chip GaN-based light-emitting diodes

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Science in China(Series F) 2009年第8期52卷 1476-1482页

作者： DA XiaoLi SHEN GuangDi XU chen zou DeShu ZHU YanXu ZHANG JianMing Institute of Electronic Information and Control Engineering Beijing Optoelectronic Technology Lab Beijing University of TechnologyBeijing 100124 China

In order to obtain higher light output power, the flip-chip structure is used. We studied the ratio of the light of GaN sides before and after fabricating metal reflector on p-GaN. The SiO2/SiNx dielectric film reflectors were deposited through plasma enhance chemical vapor deposition following the fabrication of metal reflector, and then the dielectric film reflectors on the electrodes were etched in order to expose the electrodes to the air. It is found that comparing with the flip-chip GaN-LED without dielectric film reflectors, light output power can be increased by as high as 10.2% after the deposition of 2 pairs of SiO2/SiNx dielectric film reflectors on GaN-LEDs, which cover the sidewalls and the areas without the metal reflector. This result indicates that the high reflector formed by multi-layer dielectric films is useful to enhance the light output power of GaN-based LED, which reflects light from step sidewalls and p-GaN without metal reflector to internal, and then light emits from the surface.

关键词： GaN light emitting diodes SiO2/SiN=dielectric film reflectors plasma enhanced chemical vapor deposition

Window Detection in Facades Using Heatmap Fusion

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Journal of Computer Science & Technology 2020年第4期35卷 900-912页

作者： Chuan-Kang Li Hong-Xin Zhang Jia-Xin Liu Yuan-Qing Zhang Shan-chen zou Yu-Tong Fang State Key Laboratory of CAD&CG Zhejiang UniversityHangzhou 310058China

Window detection is a key component in many graphics and vision applications related to 3D city modeling and scene *** present a novel approach for learning to recognize windows in a colored facade *** than predicting bounding boxes or performing facade segmentation,our system locates keypoints of windows,and learns keypoint relationships to group them together into windows.A further module provides extra recognizable information at the window *** and relationships of keypoints are encoded in different types of heatmaps,which are learned in an end-to-end *** have also constructed a facade dataset with 3418 annotated images to facilitate research in this *** has richly varying facade structures,occlusion,lighting conditions,and angle of *** our dataset,our method achieves precision of 91.4%and recall of 91.0%under 50%IoU(intersection over union).We also make a quantitative comparison with state-of-the-art methods to verify the utility of our proposed *** based on our window detector are also demonstrated,such as window blending.

关键词： facade parsing window detection keypoint localization

Impact of flow rate on dynamic imbibition in fractured tight sandstone cores

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Petroleum Science 2022年第6期19卷 2895-2904页

作者： Yi-Fei Liu Cai-Li Dai chen-Wei zou Qing You Ming-Wei Zhao Guang Zhao Yong-Peng Sun Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum(East China)) Qingdao266580ShandongChina Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Energy Resources China University of GeosciencesBeijing100083China

Dynamic imbibition,which is significantly affected by flow rate,plays an important role in the development of tight *** study investigated the impact of flow rate on dynamic imbibition in fractured tight sandstone cores via online nuclear magnetic resonance core-flooding *** oil expulsion efficiency and capillary number of multiscale pores were quantitatively analyzed to elucidate the influence of flow rate on the oil recovery during dynamic *** pores of the cores used were divided into micropores(0.01-1.00 μm in diameter),mesopores(1.00-30.00 μm in diameter),and macropores(30.00-400.00 μm in diameter) by matching the T_(2)spectrum and the mercury intrusion *** volume proportion of micropores was 52.0%,and that of macropores was 19.0%.The total oil recovery of the core was found to reach 29.8% at the optimal flow rate of 0.1 mL/*** the optimal flow rate,the oil recovery of micropores reached 50.4%,followed by that of macropores(28.6%),and that of mesopores was the lowest(15.8%).The oil expulsion efficiency,the capillary number,and the contribution to total oil recovery of micropores significantly increased with the decrease in flow rate,while those of macropores *** was caused by the synergy of capillary force and displacement *** dynamic imbibition at a low flow rate,the oil in micropores was effectively expelled driven by capillary force,and the effect of displacement pressure was weak,leading to large amounts of remaining oil trapped in *** the contrary,when the flow rate was too high,large amounts of remaining oil would be trapped in *** at a moderate flow rate did the capillary force and displacement pressure both have significant effects on oil expulsion,and the oil in different sized pores was effectively expelled,thus generating a relatively high total oil recovery.

关键词： Tight oil Dynamic imbibition Flow rate Oil recovery Nuclear magnetic resonance

Experimental investigation on migration and retention mechanisms of elastic gel particles(EGPs)in pore-throats using multidimensional visualized models

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Petroleum Science 2022年第5期19卷 2374-2386页

作者： Yi-Fei Liu chen-Wei zou Xu-Guang Lou Ming-Wei Gao Guang Zhao Ming-Wei Zhao Cai-Li Dai Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum(East China)) Qingdao266580PR China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580PR China China Southern Petroleum Exploration&Development Corporation HaikouHainan570216People's Republic of China

Knowledge of migration and retention mechanisms of elastic gel particles(EGPs)in pore-throats is essential for the effective application of EGPs as a smart sweep improvement and profile control agent for enhanced oil recovery(EOR).The matching coefficient(defined as the ratio of particle size to pore-throat size)is used to investigate its influence on migration,retention and profile control performance of EGPs.A 1-D continuous pore-throat visualization model(PTVM),a 2-D heterogeneous PTVM and a 3-D heterogeneous core model were constructed and used to investigate pore-scale migration,retention and controlling mechanism of migration and retention characteristics on EGPs profile *** results of the 1-D continuous PTVM indicated that while the matching coefficient was in the optimal range(i.e.,0.20-0.32),the EGPs could not only smoothly migrate to the deeper pore-throats,but also form stable retention in the pores to resist the erosion of injected water,which was conducive to the effective indepth profile *** results of the 2-D heterogeneous PTVM verified that the sweep efficiency in low-permeability regions could be significantly improved by in-depth migration and stable retention of EGPs in the pore-throats with an optimal matching coefficient(0.29),which was much better than that in cases with a smaller matching coefficient(0.17)or an excessive matching coefficient(0.39).Moreover,the NMR displacement experiments of 3-D heterogeneous cores were carried out to simulate the EGPs profile control in actual reservoir porous *** images and T2 spectrum curves of crude oil showed that EOR in the low-permeability layer was highest(56.1%)using EGPs profile control with an optimal matching coefficient,attributing to the in-depth migration and stable retention of EGPs.

关键词： Enhanced oil recovery Elastic gel particles Matching coefficient In-depth profile control Pore-throat visualization models

Low-temperature geochemical characteristics of ore-forming fluid in the Dachang Sb deposit, Qinglong, Guizhou Province, China

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Chinese Science Bulletin 1999年第S2期44卷 205-207页

作者： chen Daiyan and zou Zhenxi Guizhou University of Technology, Guiyang 550003, China Guizhou University of Technology Guiyang 550003 China

THE samples were collected from the Dachang, Gulu, Xishe and Houpo prospects of the deposit and theminerals for fluid inclusion studies include stibnite and its associated minerals quartz, fluorite, barite,pyrite, calcite, etc. Based on systematical studies by the authors, the data have been obtained on theshape, size and vapor/liquid ratio of 615 fluid inclusions, the homogenization temperatures of 176 fluidinclusions, the salinities of 49 fluid inclusions, the decrepitation temperatures of 20 fluid inclusions, thechemical composition of 8 fluid inclusions and the hydrogen and oxygen isotopic composition of 3 fluid inclusions. On the basis of the above data, this note discusses the low-temperature geochemical characteristics of the Dachang deposit.

关键词： low-temperature geochemistry ore-forming fluid. Dachang Sb deposit.

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新建拉林铁路主要工程地质问题探讨

铁道工程学报 2016年第4期33卷 26-30页

作者：邹陈中铁二院工程集团有限责任公司成都610031

研究目的:拉林铁路地处青藏高原,地质环境极其复杂,特殊岩土与不良地质极其发育,对线路方案起控制作用。本文通过对主要工程地质问题进行分析,提出其针对性选线原则,以进一步稳定和优化线路方案。研究结论:(1)拉林铁路位于雅鲁藏布江缝... 详细信息

研究目的:拉林铁路地处青藏高原,地质环境极其复杂,特殊岩土与不良地质极其发育,对线路方案起控制作用。本文通过对主要工程地质问题进行分析,提出其针对性选线原则,以进一步稳定和优化线路方案。研究结论:(1)拉林铁路位于雅鲁藏布江缝合带中,构造发育;(2)典型特殊岩土为:软土、膨胀岩(土)、冻土等;(3)典型不良地质现象为:地震、高地应力、风沙、冰害、高地温等;(4)选线经验及原则:应沿抗震有利地段布线,宜选择河谷背风岸行进,迎风岸路堤应远离坡脚,并采取防沙固沙工程,水库塌岸地区应行走于受构造影响较小的一岸,应避开软硬夹层且层理倾向水库一侧的岸坡,宜选在覆盖层较薄的稳定山坡一侧,避免水库蓄水后往往诱发旧滑坡复活、新滑坡产生,冰害地区宜选择在阳坡一面通过,不宜在地下水发育段挖方,跨过溪沟时宜选择在坡度较陡、水流畅通的地段,线路应尽量绕避地热发育地段,无法绕避时,应选择地热边缘地带、构造简单、地热强度弱的地段,与地热分布带呈大角度相交通过;(5)该研究成果可用于类似工程的地质选线及工程设计中。

关键词：拉林铁路工程地质问题特殊岩土不良地质选线原则

Supramolecular polymer-based gel fracturing fluid with a double network applied in ultra-deep hydraulic fracturing

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Petroleum Science 2024年第3期21卷 1875-1888页

作者： Yong-Ping Huang Yong Hu Chang-Long Liu Yi-Ning Wu chen-Wei zou Li-Yuan Zhang Ming-Wei Zhao Cai-Li Dai School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Shandong Key Laboratory of Oilfield Chemistry China University of Petroleum(East China)Qingdao 266580ShandongPR China SINOPEC Petroleum Exploration and Production Research Institute Beijing102206PR China CNOOC China Co Ltd Tianjin BranchTianjin300459PR China

A gel based on polyacrylamide,exhibiting delayed crosslinking characteristics,emerges as the preferred solution for mitigating degradation under conditions of high temperature and extended shear in ultralong *** viscosity/viscoelasticity of the fracturing fluid was required to maintain excellent proppant suspension properties before *** into account both the cost and the potential damage to reservoirs,polymers with lower concentrations and molecular weights are generally *** this work,the supramolecular action was integrated into the polymer,resulting in significant increases in the viscosity and viscoelasticity of the synthesized supramolecular polymer *** double network gel,which is formed by the combination of the supramolecular polymer system and a small quantity of Zr-crosslinker,effectively resists temperature while minimizing permeability damage to the *** results indicate that the supramolecular polymer system with a molecular weight of(268—380)×10^(4)g/mol can achieve the same viscosity and viscoelasticity at 0.4 wt%due to the supramolecular interaction between polymers,compared to the 0.6 wt%traditional polymer(hydrolyzed polyacrylamide,molecular weight of 1078×10^(4)g/mol).The supramolecular polymer system possessed excellent proppant suspension properties with a 0.55 cm/min sedimentation rate at 0.4 wt%,whereas the0.6 wt%traditional polymer had a rate of 0.57 cm/*** comparison to the traditional gel with a Zrcrosslinker concentration of 0.6 wt%and an elastic modulus of 7.77 Pa,the double network gel with a higher elastic modulus(9.00 Pa)could be formed only at 0.1 wt%Zr-crosslinker,which greatly reduced the amount of residue of the fluid after *** viscosity of the double network gel was66 m Pa s after 2 h shearing,whereas the traditional gel only reached 27 m Pa s.

关键词： Ultra-deep reservoir Gel fracturing fluid Double network Supramolecular polymer system Proppant suspension property