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Energy Harvesting in the Wake of An Inverted C-Shaped Bluff Body

China Ocean Engineering 2024年第1期38卷 68-80页

作者： WANG jun-lei LI Shen-fang Md.Mahbub ALAM zhu hong-jun HU Guo-biao School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450000China Center for Turbulence Control Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Internet of Things Thrust The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China

This paper proposes a novel wake-induced vibration(WIV)-based energy harvesting system consisting of two bluff *** inverted C-shaped bluff body is stationary installed at the upstream position to generate an interference wake street,and a cylinder bluff body equipped with a transducer is elastically suspended at the downstream position to harness WIV *** hydrodynamics and energy harvesting(EH)performance of the proposed system are investigated via experimental *** reduced velocity(U*)ranging from 2 to 14(the corresponding Reynolds number ranging from 15100 to 106200)is considered in the present *** is found that the wake generated by the inverted C-shaped bluff body significantly affects the EH *** the opening angle(α)of the C-shaped bluff body increases the vibration amplitude of the downstream cylinder,thereby increasing the harvested *** the spacing(L)between two bluff bodies is two times the cylinder diameter(D),the wake-induced vibration(WIV)mode is observed,while the combined WIV and wake galloping(WG)mode occurs whenαis 150°,and L equals 3D or *** average drag coefficient becomes negative when L is 2D,3D,or *** carefully configuring a C-shaped bluff body,the wake generated by it can bring an augmenting effect on the vibration of the downstream EH *** example,the RMS power output of the proposed EH system reaches a maximum of 0.31 W at U*=8 and L=4D,which is 300%greater than that of its traditional ***,after a number of case stud-ies,it is identified that the proposed EH system can achieve the best performance whenαis 150°and L=2D.

关键词： wake-induced vibration vortex-induced vibration galloping energy harvesting bluff body

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全胸腔镜下肺叶切除治疗空洞型肺结核的临床疗效及安全性研究

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罕少疾病杂志 2024年第3期31卷 51-52,55页

作者：任廷楷刘政刘锋朱红军商丘市第一人民医院胸外科河南商丘476000

目的研究全胸腔镜下肺叶切除治疗空洞型肺结核的临床疗效及安全性。方法选择2019年4月-2022年4月于本院胸外科收治的空洞型肺结核124例患者资料进行回顾性分析,根据手术方式将其分为对照组(61例,开胸肺叶切除术)和观察组(63例,全胸腔镜... 详细信息

目的研究全胸腔镜下肺叶切除治疗空洞型肺结核的临床疗效及安全性。方法选择2019年4月-2022年4月于本院胸外科收治的空洞型肺结核124例患者资料进行回顾性分析,根据手术方式将其分为对照组(61例,开胸肺叶切除术)和观察组(63例,全胸腔镜下肺叶切除术),比较两组术前,术后3个月的手术相关指标、肺功能指标中的用力肺活量(FVC)、第1秒用力呼气量(FEV1)、FEV1/FVC、心功能指标中的左心室射血分数(LVEF)、左心室舒张末期直径(LVEDD)以及并发症情况。结果观察组术中出血量少于对照组,手术时间以及住院时间短于对照组(P<0.05);术后,观察组FVC、FEV1、FEV1/FVC、LVEF水平高于对照组,LVEDD水平低于对照组(P<0.05);观察组并发症发生率为4.77%,明显低于对照24.60%(P<0.05)。结论与传统开胸式肺叶切除术相比,全胸腔镜下肺叶切除术能减少空洞型肺结核患者术中出血量,缩短手术及住院所需时间,可以显著改善心肺功能,具有较高的安全性,也是一种可靠的更有利于患者速康复的手术方式。

关键词：全胸腔镜下肺叶切除空洞型肺结核临床疗效

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日本食蚧蚜小蜂的羽化行为及繁殖力观察

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应用昆虫学报 2024年第1期61卷 151-156页

作者：韩姗妮陈俊谕王景威叶政培陈鹤升朱俊洪符悦冠韩冬银李磊张方平中国热带农业科学院环境与植物保护研究所海南省热带作物病虫害生物防治工程技术研究中心农业农村部热带作物有害生物综合治理重点实验室海南省热带农业有害生物监测与控制重点实验室海口571101 海南大学植物保护学院海口570228 海南大学林学院詹州571737

【目的】探明日本食蚧蚜小蜂Coccophagus japonicus Compere的羽化行为及繁殖能力。【方法】在室内观察了日本食蚧蚜小蜂的羽化行为、羽化节律及补充营养物质(海藻糖、松三糖、蔗糖、蜂蜜、果糖和葡萄糖)对小蜂寿命、生殖力等方面的影... 详细信息

【目的】探明日本食蚧蚜小蜂Coccophagus japonicus Compere的羽化行为及繁殖能力。【方法】在室内观察了日本食蚧蚜小蜂的羽化行为、羽化节律及补充营养物质(海藻糖、松三糖、蔗糖、蜂蜜、果糖和葡萄糖)对小蜂寿命、生殖力等方面的影响。【结果】日本食蚧蚜小蜂的羽化分为介壳虫体内羽化及成蜂出壳两个过程,羽化高峰期为06:00-10:00。补充蔗糖的寿命最长,为15.58 d,其次为果糖(14.97 d)。补充蔗糖后产卵量最高,为236.5粒,其次为果糖(192.0粒)及蜂蜜(191.0粒),葡萄糖最低(156.5粒),产卵高峰出现在羽化后第2天,然后随产卵雌蜂日龄的增加呈下降趋势。子代的出蜂量以雌蜂为6日龄的最高,然后随雌蜂日龄的增加子代出蜂量大幅下降。【结论】可选用6日龄内的日本食蚧蚜小蜂雌蜂进行室内扩繁和田间释放,并可补充蔗糖水溶液以提升其扩繁和防治效果。

关键词：日本食蚧蚜小蜂羽化节律营养物质寿命生殖力

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Numerical Simulation of the Vortex-Induced Vibration of A Curved Flexible Riser in Shear Flow

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China Ocean Engineering 2018年第3期32卷 301-311页

作者： zhu hong-jun LIN Peng-zhi State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University

A series of fully three-dimensional(3 D) numerical simulations of flow past a free-to-oscillate curved flexible riser in shear flow were conducted at Reynolds number of 185–1015. The numerical results obtained by the two-way fluid–structure interaction(FSI) simulations are in good agreement with the experimental results reported in the earlier study. It is further found that the frequency transition is out of phase not only in the inline(IL) and crossflow(CF) directions but also along the span direction. The mode competition leads to the non-zero nodes of the rootmean-square(RMS) amplitude and the relatively chaotic trajectories. The fluid–structure interaction is to some extent reflected by the transverse velocity of the ambient fluid, which reaches the maximum value when the riser reaches the equilibrium position. Moreover, the local maximum transverse velocities occur at the peak CF amplitudes, and the values are relatively large when the vibration is in the resonance regions. The 3 D vortex columns are shed nearly parallel to the axis of the curved flexible riser. As the local Reynolds number increases from 0 at the bottom of the riser to the maximum value at the top, the wake undergoes a transition from a two-dimensional structure to a 3 D one. More irregular small-scale vortices appeared at the wake region of the riser, undergoing large amplitude responses.

关键词： vortex-induced vibration flexible riser shear flow fluid–structure interaction computational fluid dynamics

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Experimental Investigation of Vibration Response of A Free-Hanging Flexible Riser Induced by Internal Gas-Liquid Slug Flow

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China Ocean Engineering 2018年第6期32卷 633-645页

作者： zhu hong-jun ZHAO hong-lei GAO Yue State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

The vibration response of a free-hanging flexible riser induced by internal gas-liquid slug flow was studied experimentally in a small-diameter tube model based on Froude number criterion. The flow regime in a curved riser model and the response displacements of the riser were simultaneously recorded by high speed cameras. The gas superficial velocity ranges from 0.1 m/s to 0.6 m/s while the liquid superficial velocity from 0.06 m/s to 0.3 m/*** slugging type 3, unstable oscillation flow and relatively stable slug flow were observed in the considered flow rates. Severe slugging type 3 characterized by premature gas penetration occurs at relatively low flow rates. Both the cycle time and slug length become shorter as the gas flow rate increases. The pressure at the riser base undergoes a longer period and larger amplitude of fluctuation as compared with the other two flow regimes. Additionally, severe slugging leads to the most vigorous in-plane vibration. However, the responses in the vertical and horizontal directions are not synchronized. The vertical vibration is dominated by the second mode while the horizontal vibration is dominated by the first mode. Similar to the vortex-induced vibration, three branches are identified as initial branch, build-up branch and descending branch for the response versus the mixture velocity of gas-liquid flow.

关键词： gas-liquid two-phase flow severe slugging liquid slug flexible riser flow-induced vibration

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Flow-Induced Vibration of Four Cantilever Cylinders Arranged in A Square Configuration

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China Ocean Engineering 2021年第6期35卷 891-904页

作者： zhu hong-jun LIU Wen-li WANG jun-lei State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450000China

Flow-induced vibration(FIV)of four separately mounted cantilever cylinders are experimentally investigated in a water *** four cylinders with top ends screwed vertically into a turntable platform are subjected to uniform flows with Reynolds number ranging from 3840 to 16520.A non-intrusive measurement with high-speed cameras is employed to simultaneously capture the time-varying in-line and cross-flow vibrations in the reduced velocity range of *** results highlight the continuous adjustment of flow regime caused by the spatial-temporal alteration of ***,the space-time varying flow interference contributes to the occurrence of multiple response *** transition from a dominant frequency to a broad-band response illustrates the enhancement of wake *** combination of wake flow interactions results in the irregular oscillation trajectories and the appearance of a response trough with the associated switching in vortex shedding *** dual-resonance phenomenon is observed in the four cylinders due to the complicated wake-structure *** greatest mechanical energy possessed by the four cylinders in an in-line square arrangement is mainly resulted from the downstream cylinders,signifying the positive role of wake excitation in extracting hydrokinetic energy from ambient flow.

关键词： flow-induced vibration mechanical energy cantilever cylinder time-varying spacing attack angle

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Surface-induced Microstructure and Performance Changes in P3HT Ultrathin Films

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Chinese Journal of Polymer Science 2024年第6期42卷 805-814页

作者： hong-Tao Shan Jia-Xin He Bing-Yan zhu Xue-Ting Cao Ying-Ying Yan Jian-jun Zhou hong Huo Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing100875China

In this work,poly(3-hexylthiophene)(P3HT)ultrathin films(P3HT-T)were prepared by spin-coating a dilute P3HT solution(in a toluene:o-dichlorobenzene(Tol:ODCB)blend with a volume ratio of 80:20)with ultrasonication and the addition of the nucleating agent bicycle[2.2.1]heptane-2,3-dicarboxylic acid disodium salt(HPN-68L)on glass,Si wafers and indium tin oxide(ITO)*** electrical and mechanical properties of the P3HT-T ultrathin films were investigated,and it was found that the conductivity and crack onset strain(COS)were simultaneously improved in comparison with those of the corresponding pristine P3HT film(P3HT-0,without ultrasonication and nucleating agent)on the same substrate,regardless of what substrate was ***,the conductivity of P3HT-T ultrathin films on different substrates was similar(varying from 3.7 S·cm^(-1)to 4.4 S·cm^(-1)),yet the COS increased from 97%to 138%by varying the substrate from a Si wafer to *** grazing-incidence wide-angle X-ray diffraction(GIXRD),UV-visible(UV-Vis)spectroscopy and atomic force microscopy(AFM),we found that the solid order and crystallinity of the P3HT-T ultrathin film on the Si wafer are highest,followed by those on glass,and much lower on ***,the surface energy and roughness of three substrates were investigated,and it was found that the polar component of the surface energyγp plays a critical role in determining the crystalline microstructures of P3HT ultrathin films on different *** work indicates that the P3HT ultrathin film can obviously improve the stretchability and simultaneously retain similar electrical performance when a suitable substrate is *** findings offer a new direction for research on stretchable CP ultrathin films to facilitate future practical applications.

关键词： P3HT ultrathin film Substrate Crystalline microstructures Polar component of the surface energy Electrical and stretchable performances

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赖氨酸的生理功能及其在猪生产中的应用研究进展

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饲料研究 2024年第11期47卷 154-159页

作者：贾荟瑾朱俊红易兰兰李秋艳关轩承程文杰黄英赵素梅云南农业大学动物科学技术学院云南昆明650201

赖氨酸作为猪的一种功能性必需氨基酸,具有多种生理功能。饲粮中添加适宜水平的赖氨酸有利于提高猪的生长性能和饲料养分消化率,调控猪肠道消化酶活性和氨基酸转运载体表达,从而影响猪肠道营养物质的吸收。但赖氨酸过多会影响细胞活力,... 详细信息

赖氨酸作为猪的一种功能性必需氨基酸,具有多种生理功能。饲粮中添加适宜水平的赖氨酸有利于提高猪的生长性能和饲料养分消化率,调控猪肠道消化酶活性和氨基酸转运载体表达,从而影响猪肠道营养物质的吸收。但赖氨酸过多会影响细胞活力,过少则会影响新陈代谢,诱发仔猪炎症反应,均不利于猪的正常生长发育。不同阶段猪对赖氨酸的需要量受猪品种类型、性别和饲养阶段等因素影响。L-赖氨酸及羧化聚-L-赖氨酸、3,3-二甲基戊二酸酐聚-L-赖氨酸和ε-聚-L-赖氨酸等赖氨酸衍生物也是很好的冷冻保存剂,在生猪产业链中发挥了极大的作用。文章综述了赖氨酸在猪养分消化率、免疫功能、肠道健康和骨骼肌生长等方面的研究进展,分析了猪生产中适宜的赖氨酸需要量及赖氨酸与L-精氨酸的互作关系,总结了L-赖氨酸作为冷冻保存剂在猪生产上的应用研究。随着赖氨酸及其衍生物在猪生产中的广泛应用,其作用效果和机理研究也不断深入,更加精准的赖氨酸的需要量将有助于进一步改善猪生产性能,提高饲料利用率。

关键词：赖氨酸能量代谢免疫猪生长性能

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Coupling N-doping and confined Co3O4 on carbon nanotubes by polydopamine coating strategy for pleiotropic water purification

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Rare Metals 2024年第7期43卷 3146-3160页

作者： Wen-Long Tu Gang Wang Yue Zhang hong-Yang zhu Rong-Rong Du hong-Yao Zhao Sheng Tang Zeng-Jing Guo jun Yang Fu Yang Cheng-Zhang zhu School of Environmental and Chemical Engineering Jiangsu University of Science and Technology School of Chemistry and Chemical Engineering Liaocheng University School of Material Science and Engineering Jiangsu University of Science and Technology School of Environmental Science and Engineering Nanjing Tech University

The development of effective and sustainable solutions for pleiotropic water purification becomes urgent and *** Fenton-like catalysts for activation of peroxymonosulfate（PMS） to purify organic wastewater show great *** this work,by tuning metal loading with an in-situ polydopamine coating strategy,oxygen vacancy-enriched Co3O4loading on N-doped carbon nanotubes（CNTs） were constructed to enhance PMS activation efficiency for pollutants ***,the obtained modified CNTs afford a well-developed N-containing network structure,which is further endowed with abundant Co（Ⅱ）/Co（Ⅲ） redox cycles and significant metal-carbon *** particular,the surface N doping in CNTs might induce the oriented enrichment of pollutants around the catalyst,which reduces the migration distance and correspondingly improves the utilization of reactive oxidative *** electron transfer efficiency of the catalyst can be further improved by incorporating oxygen vacancy-enriched *** performance results show that the optimal NC/Co-1 could mineralize 20 × 10-6of bisphenol A（BPA） by almost 98% in 8 min.A low reaction activation energy(26.05 kJ·mol-1) in BPA degradation was demonstrated by the NC/*** importantly,NC/Co-1 can inherit excellent degradation performance towards oxytetracycline,2,4-dichlorophenol,and tetracycline,showing wide practical *** addition,by virtue of the photothermal conversion property,NC/Co-1 achieves an additive function for interfacial solar water evaporation(1.84 kg·m-2·h-1,112.51%),showing impressive potential for clean water recovery under complicated environmental pollution conditions.

关键词： Carbon nanotube Advanced oxidation process Co 3 O 4 Photothermal conversion Solar water evaporation

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Constructing core@shell structured photothermal nanosphere with thin carbon layer confined Co-Mn bimetals for pollutant degradation and solar interfacial water evaporation

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Rare Metals 2024年第4期43卷 1686-1701页

作者： hong-Yang zhu Meng-Ting Liu Gang Wang Rong-Rong Du hong-Yao Zhao Hao Lu Shi-Qi Yang Sheng Tang Zeng-Jing Guo jun Yang Cheng-Zhang zhu Fu Yang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003China School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng252000China School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China

Photothermal material applied in environmental governance has attracted growing *** combining the Stober method and dopamine-triggered coating strategy,Co-Mn precursor was in situ incorporated into the poly dopamine(PDA)layer over the surface of silica ***,a unique photothermal nanosphere with SiO_(2)core and thin carbon layer and dual Co-Mn oxides shell was allowed to form by sequential heat treatment in the inert atmosphere(SiO_(2)@CoMn/C).The bimetallic fraction of Co/Mn in the carbon layer and post-treatment calcination temperature was comprehensively tuned to optimize the peroxymonosulfate(PMS)activation performance of the *** state of bimetallic species was studied including their physical distribution,chemical valence,and interplay by various ***,Co oxides appear as dominant monodispersed nanoparticles(~10 nm),while Mn with cluster-like morphology is observed to uniformly distribute over thin-layer carbon and adhered to the surface of SiO_(2)nanospheres(~250 nm).The calcined temperature could tune the oxidized state of Co species,leading to the optimization of the catalytic performance of introduced dual metal *** a result,this obtained optimal catalyst integrated the advantages of exposed bimetallic CoMn species and N-doped thin carbon to deliver excellent catalytic PMS activation performance and photothermal synergetic catalytic mineralization ability for diversiform *** reactions condition controls and anion interference studies were conducted to identify the adaptability of the optimal ***,the application of solar-driven interfacial water evaporation using optimal SiO_(2)@Co_3Mn_1/C-600 catalyst was explored,showing a high water evaporation rate of 1.48 kg·m^(-2)·h^(-1)and an efficiency of 95.2%,further revealing a comprehensive governance functionality of obtained material in the complex pollution condition.

关键词： Photothermal Peroxymonosulfate(PMS)activation Bimetallic synergy Water evaporation Advanced oxidation process

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