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Influence of Surface Ice Roughness on the Aerodynamic Performance of Wind Turbines

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Fluid Dynamics & Materials Processing 2024年第9期20卷 2029-2043页

作者： Xin Guan Mingyang Li shiwei wu Yuqi Xie Yongpeng Sun School of New Energy Shenyang Engineering CollegeShenyang110136China Shenyang Key Laboratory Clean Energy Fine Comprehensive Utilization and Scheduling Energy Storage Shenyang110136China

The focus of this research was on the equivalent particle roughness height correction required to account for the presence of ice when determining the performances of wind *** particular,two icing processes(frost ice and clear ice)were examined by combining the FENSAP-ICE and FLUENT analysis *** ice type on the blade surfaces was predicted by using a multi-time step ***,the influence of variations in icing shape and ice surface roughness on the aerodynamic performance of blades during frost ice formation or clear ice formation was *** results indicate that differences in blade surface roughness and heat flux lead to disparities in both ice formation rate and shape between frost ice and clear *** ice has a greater impact on aerodynamics compared to frost ice,while frost ice is significantly influenced by the roughness of its icy surface.

关键词： Wind turbine icing blade surface roughness aerodynamic characteristics airfoil

电针通过调控交感-感觉耦联缓解坐骨神经分支损伤小鼠痛觉过敏

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神经解剖学杂志 2024年第2期40卷 203-210页

作者：吴世伟王菲田志成褚文广罗层陕西中医药大学针灸推拿学院咸阳712000 空军军医大学基础医学院神经生物学教研室西安710032 空军军医大学研究生院西安710032

目的:观察电针(EA)干预对坐骨神经分支损伤模型(SNI)小鼠背根神经节(DRG)中去甲肾上腺素(NE)、α2A肾上腺素受体(α2A-R)的作用。方法:将雄性C57BL/6小鼠随机分为假手术组(Sham)、模型组(SNI)、假电针组(SNI+NC-EA)和电针组(SNI+EA)。... 详细信息

目的:观察电针(EA)干预对坐骨神经分支损伤模型(SNI)小鼠背根神经节(DRG)中去甲肾上腺素(NE)、α2A肾上腺素受体(α2A-R)的作用。方法:将雄性C57BL/6小鼠随机分为假手术组(Sham)、模型组(SNI)、假电针组(SNI+NC-EA)和电针组(SNI+EA)。使用机械刺激和热辐射刺激分别检测机械缩足反应阈值(PWMT)和热刺激缩足反应潜伏期(PWTL)。通过免疫荧光染色检测小鼠DRG内交感神经纤维芽生及α2A-R与大直径感觉神经元共标数量;采用ELISA试剂盒检测小鼠血清及DRG中NE含量,Western Blot检测DRG内酪氨酸羟化酶(TH)和α2A-R表达水平。结果:SNI后,PWMT及PWTL均显著降低,电针治疗后,PWMT及PWTL逆转升高;免疫荧光染色显示:SNI后DRG中交感芽生增生,电针治疗后,交感芽生明显减弱;SNI后,DRG内NE、α2A-R及TH均显著升高,电针干预后降低其表达,但血清中NE无明显变化。结论:在SNI模型中,电针调控交感-感觉耦联可能是通过抑制DRG中NE的释放及α2A-R的表达,从而产生镇痛效应。

关键词：电针神经病理性疼痛背根神经节去甲肾上腺素肾上腺素受体小鼠

Ni-CeO_(2)黑色防护镀层的光助动电位沉积及光热性能

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材料导报 2024年第14期38卷 77-85页

作者：吴世伟杨雨萌段雪佳蓝世锋李舒铭朱本峰卫国英中国计量大学材料与化学学院杭州310018

镍镀层作为一种重要的工程材料,已经在金属涂装等领域得到了广泛的应用,而二氧化铈作为一种重要的稀土氧化物也引起了学者们极大的关注。本工作利用光助动电位沉积法制备了Ni-CeO_(2)复合黑色镀层,分别研究了光照条件、沉积电位范围和... 详细信息

镍镀层作为一种重要的工程材料,已经在金属涂装等领域得到了广泛的应用,而二氧化铈作为一种重要的稀土氧化物也引起了学者们极大的关注。本工作利用光助动电位沉积法制备了Ni-CeO_(2)复合黑色镀层,分别研究了光照条件、沉积电位范围和沉积温度对镀层结构、组成和性能的影响。采用循环伏安法、塔菲尔极化曲线、接触角测量仪、台阶仪、紫外-可见-近红外分光光度计、发射率测量仪、扫描电子显微镜及附属能谱对不同条件下制备的镀层进行了系列表征。结果表明,光照条件下,沉积电位范围为0~-1.5 V、沉积温度为50℃时制备的Ni-CeO_(2)复合黑色镀层具有最佳的综合性能,其腐蚀电流密度为9.642×10^(-6)A·cm^(-2),水接触角达到125.95°,各波段吸收率均在94%以上且具有0.592的发射率。当沉积电位范围为0~-3.5 V时,镀层具有最高的发射率,达0.757;光照条件除了对CeO_(2)的沉积产生影响之外,也显著提升了Ni的沉积速率。该研究为制备具有高吸收率和发射率的黑色复合镀层提供了一个思路,有望在光热转换和光学仪器中得到应用。

关键词：动电位沉积镍-二氧化铈复合黑色镀层沉积电位沉积温度光照

饱水裂隙砂岩动态力学特性与裂纹扩展规律研究

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岩石力学与工程学报 2024年第S1期43卷 3131-3139页

作者：平琦孙施佳高祺吴世伟李向阳徐一杰胡静唐庆林安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室安徽淮南232001 安徽理工大学矿山地下工程教育部工程研究中心安徽淮南232001 安徽理工大学土木建筑学院安徽淮南232001

为研究饱水裂隙岩石动态力学特性及裂纹扩展规律,对预制0°,15°,30°,45°,60°,75°,90°共7种倾角裂隙的砂岩试件进行饱水处理,利用SHPB试验装置开展冲击压缩试验。结果表明:不同倾角预制裂隙的饱水砂岩和天然砂岩试件动应力-应变曲... 详细信息

为研究饱水裂隙岩石动态力学特性及裂纹扩展规律,对预制0°,15°,30°,45°,60°,75°,90°共7种倾角裂隙的砂岩试件进行饱水处理,利用SHPB试验装置开展冲击压缩试验。结果表明:不同倾角预制裂隙的饱水砂岩和天然砂岩试件动应力-应变曲线相似,大致分为3个阶段,试件动抗压强度、动应变和动弹性模量均随裂隙倾角增大整体呈先减小后增大的趋势;与预制裂隙天然砂岩试件相比,饱水砂岩试件动抗压强度和动弹性模量略有提升,而动应变减小,表现出动态加载条件下水作用的Stefan效应。随预制裂隙倾角变化,饱水砂岩试件破坏方式呈现为张拉、剪切和张拉剪切复合型等破坏模式,裂隙倾角0°和15°时为Ⅱ型破坏,30°~75°时为Ⅰ-Ⅱ复合型破坏,90°时为Ⅰ型破坏。预制裂隙砂岩试件裂纹起裂位置主要集中在裂隙尖端附近,起裂角随预制裂隙倾角增大而减小,且入射端起裂角大于透射端。

关键词：岩石力学饱水状态裂隙砂岩冲击压缩 SHPB试验装置

The effects of PM_(2.5)concentration on residents'health from the perspective of spatial economics

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Chinese Journal of Population,Resources and Environment 2020年第2期18卷 137-143页

作者： shiwei wu School of Economics and Management Fuzhou UniversityFuzhou350108China

Ambient air quality is an important part of the ecological *** on panel data from 192 countries for the period 2010–2016,our study applies spatial geography elements in a spatial panel model to analyze whether PM_(2.5)harms residents'*** find a positive correlation between PM_(2.5)concentration and the prevalence of *** testing shows that if residents live in environments with high PM_(2.5)concentrations for an extended period,it increases their probability of contracting ***_(2.5)concentration and economic growth have an environmental Kuznets curve(EKC)***,PM_(2.5)concentration and prevalence of tuberculosis in different countries have a positive spatial correlation during the study *** values of PM_(2.5)concentration in adjacent areas are similar,because PM_(2.5)can cross borders through airflow and as economic development levels in adjacent regions are *** regulating haze pollution,we should adopt regional joint governance,consider the specific characteristics of different regions,and coordinate these regulations with environmental protection policies to realize the goal of“lucid waters and lush mountains.”

关键词： PM_(2.5)concentration Residents'health Spatial spillover Environmental Kuznets curve

Nanoscale Impact Ionization and Electroluminescence in a Biased Scanning-Tunneling-Microscope Junction

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Chinese Physics Letters 2022年第3期39卷 99-104页

作者： Lehua Gu Shuang wu Shuai Zhang shiwei wu State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(MOE)and Department of PhysicsFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200232China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Electroluminescence from a p-type Ga As(110)surface was induced by tunneling electrons in a scanning tunneling microscope under both polarities of bias *** optical spectra exhibit a polarity-independent luminescence peak at 1.47 eV resulting from the exciton ***,the quantum yield of photon emission at negative bias voltage is two orders of magnitude weaker than that at positive bias ***,the luminescence at negative bias voltage shows the linear dependence of bias voltage,distinct from the rapid rise due to resonant electron injection at positive ***,the threshold bias voltage for electroluminescence at negative bias is nearly twice the bandgap of Ga As,not simply satisfying the energy conservation for the creation of an electron–hole *** theoretical calculation,we propose an impact ionization model to nicely explain the newly observed electroluminescence at negative bias *** believe that this mechanism of impact ionization could be readily applied to other nanoscale optoelectronics including 2D semiconductors and 1D nanostructures.

关键词： tunneling luminescence Tunnel

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盾构隧道近接斜穿运营公路安全评估及对策

路基工程 2024年第4期 225-229页

作者：刘继忠熊晋吴世伟中冶赛迪城市建设(重庆)有限公司重庆400000

以某地铁18号线合江车辆段出入段线区间为例,通过数值模拟等方法,对盾构隧道近接斜穿运营一级公路进行安全评估,分析公路路面的变形情况,提出相应的对策措施。结果表明:盾构隧道近接斜穿对一级公路的影响较小,控制值均在规范允许范围内... 详细信息

以某地铁18号线合江车辆段出入段线区间为例,通过数值模拟等方法,对盾构隧道近接斜穿运营一级公路进行安全评估,分析公路路面的变形情况,提出相应的对策措施。结果表明:盾构隧道近接斜穿对一级公路的影响较小,控制值均在规范允许范围内;理论计算值与施工监测值之间存在一定的差异。提出盾构信息化施工及地面注浆加固等变形控制主要措施。

关键词：盾构隧道运营公路安全评估数值模拟变形控制地面注浆加固

X-RAY POWDER DIFFRACTION DATA AND STRUCTURAL PARAMETERS FOR RECOMPOUND NdCo_0.6Sb_2

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中国有色金属学会会刊：英文版 1997年第2期7卷 61-63页

作者： Zeng, Lingmin wu, shiwei Qin, Wen Zhang, Liping Yan, Jialin Hao, Jianmin Nong, Liangqin Guangxi Univ Nanning China

ＸＲＡＹＰＯＷＤＥＲＤＩＦＦＲＡＣＴＩＯＮＤＡＴＡＡＮＤＳＴＲＵＣＴＵＲＡＬＰＡＲＡＭＥＴＥＲＳＦＯＲＲＥＣＯＭＰＯＵＮＤＮｄＣｏ０．６Ｓｂ２①ＺｅｎｇＬｉｎｇｍｉｎ，ＷｕＳｈｉｗｅｉ，ＱｉｎＷｅｎ，ＺｈａｎｇＬｉ... 详细信息

ＸＲＡＹＰＯＷＤＥＲＤＩＦＦＲＡＣＴＩＯＮＤＡＴＡＡＮＤＳＴＲＵＣＴＵＲＡＬＰＡＲＡＭＥＴＥＲＳＦＯＲＲＥＣＯＭＰＯＵＮＤＮｄＣｏ０．６Ｓｂ２①ＺｅｎｇＬｉｎｇｍｉｎ，ＷｕＳｈｉｗｅｉ，ＱｉｎＷｅｎ，ＺｈａｎｇＬｉｐｉｎｇ，ＹａｎＪｉａｌｉｎ，Ｈａ...

关键词： RE compound NdCo 0.6 Sb 2 X ray diffraction data structural parameters

Selective laser melting of dense and crack-free AlCoCrFeNi_(2.1) eutectic high entropy alloy: Synergizing strength and ductility

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Journal of Materials Science & Technology 2022年第22期117卷 133-145页

作者： Lin He shiwei wu Anping Dong Haibin Tang Dafan Du Guoliang Zhu Baode Sun Wentao Yan Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering National University of Singapore117575Singapore School of Intelligent Manufacturing Nanjing University of Science and TechnologyNanjing 210094China

Additively manufactured high-entropy alloys generally suffer from low strength and/or poor *** this work,by leveraging the good castability of eutectic high entropy alloys and high cooling rate of selective laser melting(SLM),we report a nearly fully dense and crack-free as-SLM AlCoCrFeNi_(2.1) eutectic high entropy alloy with an exceptional strength-ductility synergy,showing an ultrahigh yield strength of 982.1±35.2 MPa and an ultimate tensile strength of 1322.8±54.9 MPa together with an elongation to fracture of 12.3±0.5%.Such strength-ductility enhancement is owing to the heterogeneous eutectic microstructure consisting of the columnar,equiaxed,and“L-shape”cells with much refined sizes down to *** morphology of cells in the transition zone is related to the misorientation between the growth direction of adjacent *** heterogeneous eutectic microstructure is the result of the graingrowth behavior dominated by the mechanisms of the epitaxial growth and growth of heterogeneous nuclei in *** current results provide a new methodology for the future design of ultrahigh-strength and ductile SLM-fabricated metallic materials including HEAs,and other printable alloys for various structural applications.

关键词： Additive manufacturing High entropy alloy Microstructure Mechanical properties Laser Crack-free