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A reduced-order model for fast predicting ionized flows of hypersonic vehicles along flight trajectory

Chinese Journal of Aeronautics 2024年第1期37卷 89-105页

作者： jingchao zhang Chunsheng NIE Jinsheng CAI Shucheng PAN School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi’an 710072China

An improved Reduced-Order Model(ROM)is proposed based on a flow-solution preprocessing operation and a fast sampling strategy to efficiently and accurately predict ionized hypersonic *** ROM is generated in low-dimensional space by performing the Proper Orthogonal Decomposition(POD)on snapshots and is coupled with the Radial Basis Function(RBF)to achieve fast prediction ***,due to the disparate scales in the ionized flow field,the conventional ROM usually generates spurious negative ***,this issue is addressed by performing flow-solution preprocessing in logarithmic space to improve the conventional ***,extra orthogonal polynomials are introduced in the RBF interpolation to achieve additional improvement of the prediction *** addition,to construct high-efficiency snapshots,a trajectory-constrained adaptive sampling strategy based on convex hull optimization is *** evaluate the performance of the proposed fast prediction method,two hypersonic vehicles with classic configurations,i.e.a wave-rider and a reentry capsule,are used to validate the proposed *** two cases show that the proposed fast prediction method has high accuracy near the vehicle surface and the free-stream region where the flow field is *** with the conventional ROM prediction,the prediction results are significantly improved by the proposed method around the discontinuities,*** shock wave and the ionized *** a result,the proposed fast prediction method reduces the error of the conventional ROM by at least 45%,with a speedup of approximately 2.0×105compared to the Computational Fluid Dynamic(CFD)*** test cases demonstrate that the method developed here is efficient and accurate for predicting ionized hypersonic flows.

关键词： Reduced-order model Radial basis function Constrained sampling Transfer function Fast flow prediction Ionized hypersonic flows

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Boosting cycling stability by regulating surface oxygen vacancies of LNMO by rapid calcination

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Nano Research 2024年第4期17卷 2671-2677页

作者： Haoran Jiang Cuihua Zeng Wei Zhu Jiawei Luo Zhedong Liu jingchao zhang Rui Liu Yunhua Xu Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Spinel LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)has attracted intensive interest for lithium-ion battery due to its high voltage and high energy ***,severe capacity fade attributed to unstable surface structure has hampered its *** vacancies(OVs)tend to occur in the surface of the material and lead to surface structure reconstruction,which deteriorates the battery performance during electrochemical ***,we utilize high-temperature-shock(HTS)method to synthesize LNMO materials with fewer surface *** calcination drives lower surface OVs concentration,reducing the content of Mn^(3+)and surface reconstruction layers,which is beneficial to obtain a stable crystal *** LNMO material synthesized by HTS method delivers an initial capacity of 127 mAh·g^(-1) at 0.1 C and capacity retention of 81.6%after 300 cycles at 1 C,and exhibits excellent performance at low temperature.

关键词： ultrafast synthesis oxygen vacancy LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)cathode high-temperature-shock lithium-ion batteries

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Approaching Ultimate Synthesis Reaction Rate of Ni-Rich Layered Cathodes for Lithium-Ion Batteries

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Nano-Micro Letters 2024年第10期16卷 392-402页

作者： Zhedong Liu jingchao zhang Jiawei Luo Zhaoxin Guo Haoran Jiang Zekun Li Yuhang Liu Zijing Song Rui Liu Wei-Di Liu Wenbin Hu Yanan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072People's Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People's Republic of China Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Nickel-rich layered oxide LiNi_(x)Co_(y)MnzO_(2)(NCM,x+y+z=1)is the most promising cathode material for high-energy lithium-ion ***,conventional synthesis methods are limited by the slow heating rate,sluggish reaction dynamics,high energy consumption,and long reaction *** overcome these chal-lenges,we first employed a high-temperature shock(HTS)strategy for fast synthesis of the NCM,and the approaching ultimate reaction rate of solid phase transition is deeply investigated for the first *** the HTS process,ultrafast average reaction rate of phase transition from Ni_(0.6)Co_(0.2)Mn_(0.2)(OH)_(2) to Li-containing oxides is 66.7(%s^(-1)),that is,taking only 1.5 *** ultrahigh heating rate leads to fast reaction kinetics,which induces the rapid phase transition of NCM *** HTS-synthesized nickel-rich layered oxides perform good cycling performances(94%for NCM523,94%for NCM622,and 80%for NCM811 after 200 cycles at 4.3 V).These findings might also assist to pave the way for preparing effectively Ni-rich layered oxides for lithium-ion batteries.

关键词： Nickel-rich layered oxides High-temperature shock Solid reaction kinetics Phase transition Reaction rate

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SO_(2) 对钾基吸附剂 CO_(2) 吸附性能的影响及机理研究

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煤炭学报 2024年第8期49卷 3647-3657页

作者：李艳红郭百合张靖超乔晓磊王彦霖金燕太原理工大学电气与动力工程学院山西太原030024 山西阳煤化工机械(集团)有限公司山西太原030032

燃煤电厂尾部烟气经脱硫后,存在的痕量SO_(2) 会导致钾基吸附剂CO_(2)吸附性能恶化。以结晶氯化铝为前驱体,采用溶胶-凝胶法制备K_(2)CO_(3)/Al_(2)O_(3)固体吸附剂,利用固定床反应系统,模拟烟气组分,在含SO_(2) (0、150、250、400 mg/m... 详细信息

燃煤电厂尾部烟气经脱硫后,存在的痕量SO_(2) 会导致钾基吸附剂CO_(2)吸附性能恶化。以结晶氯化铝为前驱体,采用溶胶-凝胶法制备K_(2)CO_(3)/Al_(2)O_(3)固体吸附剂,利用固定床反应系统,模拟烟气组分,在含SO_(2) (0、150、250、400 mg/m^(3))气氛下的CO_(2)吸附特性进行了吸附实验,结合BET、XRD表征手段,分析吸附剂孔隙结构和物质组成,采用DFT理论研究了SO_(2) 对K_(2)CO_(3)/Al_(2)O_(3)(0001)吸附剂表面吸附CO_(2)的影响及机理。结果表明,在理想气氛中,钾基吸附剂CO_(2)累积吸附量为1.72 mmol/g,当反应气氛中存在150 mg/m^(3) SO_(2) 时,钾基吸附剂与SO_(2) 发生反应生成K_(2)SO_(3),导致吸附剂的吸附量(1.38 mmol/g)降低了19.77%,SO_(2) 质量浓度增至400 mg/m^(3),钾基吸附剂CO_(2)累积吸附量逐渐降至1.26 mmol/g,吸附剂吸附CO_(2)性能恶化,钾基吸附剂在7次循环后吸附量降为1.1 mmol/g,循环性能变差。CO_(2)、SO_(2) 两种分子在K_(2)CO_(3)/Al_(2)O_(3)(0001)表面吸附位点均为Al-O桥位,H_(2)O分子的吸附位点为O顶位。K_(2)CO_(3)/Al_(2)O_(3)(0001)表面对SO_(2) 的吸附作用大于H_(2)O和CO_(2)。H_(2)O和CO_(2)共吸附时CO_(2)分子中O-s轨道与H-s轨道重叠,使得2者在表面吸附时可以相互促进;SO_(2) 分子由于其S、O原子p轨道活跃,与CO_(2)共吸附时,会优先抢占CO_(2)的吸附位点,抑制CO_(2)在表面的吸附。H_(2)O分子对K_(2)CO_(3)/Al_(2)O_(3)(0001)表面吸附SO_(2) 的促进作用大于CO_(2),H_(2)O的存在会加速SO_(2) 与表面的反应,导致吸附剂表面对CO_(2)吸附能力变差。CO_(2)与H_(2)O共吸附于K_(2)CO_(3)/Al_(2)O_(3)(0001)表面时碳酸化反应机理为H_(2)O分子中H+和OH−,分别与和CO_(2)形成HCO^(-)_(3),反应能垒为1.12 eV,反应热为−1.47 eV。

关键词： CO_(2)捕集钾基吸附剂 SO_(2) 气凝胶 DFT

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开放式多功能采区水仓及双直排系统设计

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煤 2024年第5期33卷 95-96,108页

作者：王海鹏张景超晋能控股装备制造集团有限公司山西晋城048006 山西晋煤集团长治仙泉煤业有限公司山西长治047199

针对传统的采区水仓设计实现独立通风困难,施工时岩巷掘进工程量大、拐弯多、施工复杂及排水系统单一的问题,通过对水仓布置方式及排水系统进行优化,采用“三进一回”的全负压独立通风方式,在实现独立通风系统的同时减少了岩巷掘进量及... 详细信息

针对传统的采区水仓设计实现独立通风困难,施工时岩巷掘进工程量大、拐弯多、施工复杂及排水系统单一的问题,通过对水仓布置方式及排水系统进行优化,采用“三进一回”的全负压独立通风方式,在实现独立通风系统的同时减少了岩巷掘进量及巷道拐弯次数,降低了施工难度,并将直排系统与接力排水系统相结合,大大提高了排水效率和系统的可靠性。创新设计了一种既能满足《规程》技术和设备安装要求,又能满足矿井采区水仓日常检修维护、水仓清理、应急救援等要求的开放式、多功能、双直排式大容量采区水仓。

关键词：开放式多功能双直排式排水系统

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胃癌组织中LncRNA LINC00342、miR-596表达变化与临床病理参数和预后的关系

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山东医药 2024年第19期64卷 10-14页

作者：金田韩雪张敬超河北省沧州中西医结合医院胃肠腹壁疝外一科河北沧州061000 河北省沧州中西医结合医院脾胃肝病一科河北省沧州中西医结合医院内镜诊疗科

目的探讨胃癌组织中长链非编码核糖核酸(LncRNA)长链基因间非编码核糖核酸00342(LINC00342)、微小核糖核酸-596(miR-596)表达变化与临床病理参数和预后的关系。方法选取胃癌患者93例,术中收集胃癌组织和对应癌旁组织,实时荧光定量PCR法... 详细信息

目的探讨胃癌组织中长链非编码核糖核酸(LncRNA)长链基因间非编码核糖核酸00342(LINC00342)、微小核糖核酸-596(miR-596)表达变化与临床病理参数和预后的关系。方法选取胃癌患者93例,术中收集胃癌组织和对应癌旁组织,实时荧光定量PCR法检测组织中LncRNA LINC00342、miR-596。通过starBase数据库(https://***/encori/***)预测LncRNA LINC00342与miR-596的结合位点,Pearson相关法分析胃癌组织中LncRNA LINC00342、miR-596表达的相关性,分析胃癌组织中LncRNA LINC00342、miR-596表达与临床病理参数的关系。术后对胃癌患者进行随访,根据胃癌组织LncRNA LINC00342、miR-596相对表达量均值将患者分为高/低表达组,比较各组3年生存率,用Cox回归模型分析LncRNA LINC00342、miR-596表达对胃癌患者预后的影响。结果与癌旁组织比较,胃癌组织中LncRNA LINC00342表达高,miR-596表达低(P均<0.05)。经starBase数据库预测,LncRNA LINC00342与miR-596的3'非翻译端存在互补序列。胃癌组织中LncRNA LINC00342与miR-596表达呈负相关(r=-0.777,P<0.05)。不同分化程度、TNM分期及是否淋巴结转移的胃癌组织中LncRNA LINC00342、miR-596表达比较差异有统计学意义(P均<0.05)。随访3年,93例胃癌患者死亡36例,3年总生存率为61.29%(57/93)。与LncRNA LINC00342高表达患者比较,LncRNA LINC00342低表达患者3年总生存率高(P<0.05);与miR-596低表达患者比较,miR-596高表达患者3年总生存率高(P<0.05)。胃癌患者预后的独立危险因素为低分化、TNM分期Ⅲ期、淋巴结转移和LncRNA LINC00342≥1.52(P均<0.05),独立保护因素为miR-596≥0.82(P<0.05)。结论胃癌组织中LncRNA LINC00342高表达、miR-596低表达,二者表达变化与组织分化程度、TNM分期、淋巴结转移和预后有关。

关键词：胃癌长链非编码核糖核酸长链基因间非编码核糖核酸00342 微小核糖核酸-596 临床病理参数预后

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应用OCT对不同程度糖尿病视网膜病变患者神经纤维层厚度及视网膜厚度的观察

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中华眼外伤职业眼病杂志 2024年第3期46卷 213-218页

作者：范小霞张敬超汪国锋金华市人民医院眼科金华321000

目的观察应用光学相干断层扫描成像(OCT)测量不同程度糖尿病视网膜病变(DR)患者视网膜神经纤维层(RNFL)及黄斑视网膜厚度。方法回顾性病例对照研究。纳入2021年5月至2023年5月在金华市人民医院收治的糖尿病患者117例(234眼),根据检眼镜... 详细信息

目的观察应用光学相干断层扫描成像(OCT)测量不同程度糖尿病视网膜病变(DR)患者视网膜神经纤维层(RNFL)及黄斑视网膜厚度。方法回顾性病例对照研究。纳入2021年5月至2023年5月在金华市人民医院收治的糖尿病患者117例(234眼),根据检眼镜和眼底荧光血管造影检查结果分为无糖尿病视网膜病变(NDR)组(32例,64眼)、轻度非增生型糖尿病视网膜病变(NPDR)组(46例,92眼)、中度NPDR组(39例,78眼)。所有患者均行OCT检查,比较各组平均RNFL(鼻侧、颞侧、上方、下方和视盘周围)、黄斑视网膜厚度和中心区厚度,分析其与DR严重程度关系。结果NDR组、轻度NPDR组、中度NPDR组鼻侧RNFL厚度为(85.92±8.12)、(81.35±6.28)、(76.41±5.20)μm,颞侧为(88.54±6.74)、(84.16±5.39)、(80.27±7.18)μm,视盘周围为(112.34±10.05)、(108.57±11.26)、(102.71±10.29)μm,上方为(126.67±13.43)、(118.31±12.72)、(111.89±10.50)μm,下方为(125.91±14.23)、(116.42±13.84)、(106.07±12.33)μm,总体差异有统计学意义(F=37.66、29.33、15.02、25.66、38.46,均P<0.001),其中轻度NPDR组、中度NPDR组均低于NDR组(均P<0.05)。NDR组、轻度NPDR组、中度NPDR组黄斑区视网膜厚度为(229.78±15.64)、(240.56±16.08)、(269.22±17.41)μm,中心区厚度为(175.82±13.05)、(184.90±14.11)、(197.43±14.75)μm,总体差异有统计学意义(F=113.69、42.69,均P<0.001)。其中轻度NPDR组及中度NPDR组均高于NDR组(均P<0.05)。DR病情严重程度与平均RNFL(鼻侧、颞侧、上方、下方和视盘周围)厚度呈负相关,与黄斑区视网膜厚度和中心区视网膜厚度呈正相关(r=-0.53、-0.45、-0.61、-0.63、-0.53、0.59、0.55,均P<0.001)。结论应用OCT扫描能早期评估DR患者病变严重程度,且随着疾病严重程度加重,视盘周围RNFL厚度呈下降改变,黄斑区视网膜厚度逐渐升高。

关键词：体层摄影术,光学相干糖尿病视网膜病变神经纤维视网膜黄斑

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Thermal transport in phosphorene and phosphorene-based materials:A review on numerical studies

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Chinese Physics B 2018年第3期27卷 60-71页

作者： Yang Hong jingchao zhang Xiao Cheng Zeng Department of Chemistry University of Nebraska-LincolnLincolnNE 68588USA Holland Computing Center University of Nebraska-LincolnLincolnNE 68588US

The recently discovered two-dimensional(2D)layered material phosphorene has attracted considerable interest as a promising p-type semiconducting *** this article,we review the recent advances in numerical studies of the ther-mal properties of monolayer phosphorene and phosphorene-based *** first briefly review the commonly used first-principles and molecular dynamics(MD)approaches to evaluate the thermal conductivity and interfacial thermal resistance of 2D *** of different steady-state and transient MD techniques have been elaborated on in ***,we discuss the anisotropic thermal transport of phosphorene in zigzag and armchair chiral ***-quently,the in-plane and cross-plane thermal transport in phosphorene-based heterostructures such as phosphorene/silicon and phosphorene/graphene is ***,the numerical research in the field of thermal transport in 2D phospho-rene is highlighted along with our perspective of potentials and opportunities of 2D phosphorenes in electronic applications such as photodetectors,field-effect transistors,lithium ion batteries,sodium ion batteries,and thermoelectric devices.

关键词： thermal conductivity interracial thermal resistance first-principles molecular dynamics

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Recycle spent graphite to defect-engineered,high-power graphite anode

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Nano Research 2023年第4期16卷 4240-4245页

作者： Jiawei Luo jingchao zhang Zhaoxin Guo Zhedong Liu Shuming Dou Wei-Di Liu Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Graphite is a dominant anode material for lithium-ion batteries(LIBs)due to its outstanding electrochemical ***,slow lithium ion(Li+)kinetics of graphite anode restricts its further ***,we report that high-temperature shock(HTS)can drive spent graphite(SG)into defect-rich recycled graphite(DRG)which is ideal for high-rate *** DRG exhibits the charging specific capacity of 323 mAh/g at a high current density of 2 C,which outperforms commercial graphite(CG,120 mAh/g).The eminent electrochemical performance of DRG can be attributed to the recovery of layered structure and partial remaining defects of SG during ultrafast heating and cooling process,which can effectively reduce total strain energy,accelerate the phase transition in thermodynamics and improve the Li+*** study provides a facile strategy to guide the re-graphitization of SG and design high performance battery electrode materials by defect engineering from the atomic level.

关键词： ultrafast recycling defect-rich graphite anode high-temperature shock

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Cryo-EM for nanomaterials:Progress and perspective

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Science China Materials 2022年第10期65卷 2613-2626页

作者： jingchao zhang Jie Wen Wei-Di Liu Xiaoya Cui Yanan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Beijing Advanced Innovation Center for Structural Biology Tsinghua-Peking Center for Life SciencesCentre for Plant BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China Beijing Frontier Research Center for Biological Structures Tsinghua UniversityBeijing 100084China Ministry of Education Key Laboratory of Protein Sciences Beijing Advanced Innovation Center for Structural BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQueensland 4072Australia

Cryogenic electron microscopy(cryo-EM)has extensively boosted structural biology research since the“resolution revolution”in the year of 2013 which was soon awarded the Nobel Prize in Chemistry in *** advances in camera techniques and software algorithms enabled cryoEM to routinely characterize the three-dimensional structures of biomolecules at near-atomic *** are basically sensitive to electron irradiation damage,which can be minimized at *** principle has inspired material scientists to characterize electron beam-or air-sensitive materials by cryo-EM,such as the electrodes in the lithium-ion battery,metal-organic frameworks(MOFs),covalent-organic frameworks(COFs)and *** addition,the reaction systems can be fast-frozen at vitreous ice in cryoEM,which correspondingly preserves the materials at the close-to-native ***,we summarized the development and applications of both the cryo-EM technique and other emerging cryo-techniques in materials science,and energy storage and ***-EM techniques,capable of the direct observation of sensitive materials and electrochemical reaction processes,will greatly renew our understanding of materials science and related mechanisms.

关键词： cryogenic electron microscopy structural biology 3D reconstruction atomic resolution nanomaterials

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