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China Ocean Engineering 2024年第3期38卷 394-407页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan REN Xiao-hui hou hao hao Lian-hong College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China

In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference effects on the riser,a VIV experiment of rough risers in tandem arrangement was conducted in a wave−current combined *** experiment characterized the risers’roughness by arranging different specifications of attachments on the surface of the *** rough risers with different roughness and smooth risers were arranged in tandem arrangement,with the rough risers arranged *** experimental results indicate that the suppression of the attachments on the downstream risers’vibration are more significant both in the CF and IL directions as the reduced velocity *** the downstream riser,the amplitude response of rough riser is more significantly weakened compared with the smooth one at high reduced *** the upstream risers,changes in the roughness and spacing ratio have an impact on their‘lock-in’*** the roughness of downstream risers is relatively large(0.1300)and the spacing between risers is small(S/D=4.0),the reduced velocity range of‘lock-in’region in the CF direction of upstream risers is obviously expanded,and the displacement in the‘lock-in’region is severer.

关键词： marine riser vortex-induced vibration tandem arrangement roughness interference effect

Strategies to advance thermoelectric performance of PbSe and PbS materials

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Rare Metals 2024年第9期43卷 4099-4114页

作者： Zheng-hao hou Xin Qian Qiu-Juan Cui Shu-Fang Wang Li-Dong Zhao Shijiazhuang Key Laboratory of Low Carbon Energy Materials College of Chemical EngineeringShijiazhuang UniversityShijiazhuang 050035China Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Thermoelectric materials possess the unique capability to convert thermal energy into electric energy and vice versa,making them promising for waste heat recovery and efficient cooling ***,extensively investigated thermoelectric materials such as Bi2Te3,PbTe and GeTe exhibit superior thermoelectric properties at room temperature and medium temperature ***,the broad application of these thermoelectric materials has been impeded by the high cost and restricted accessibility of Te and Ge in the earth's *** the past few years,researchers have shown increasing interest in PbSe-and PbS-based materials,primarily attributed to their abundant elemental supply and relatively low *** assessment of research progress and a comprehensive overview of optimization strategies in time can significantly contribute to further improving the thermoelectric *** strategies include optimizing carrier concentration(aliovalent doping,dynamic doping and defect state),enhancing density-of-state effective mass(band convergence,band flattening and energy filtering effect),optimizing carrier mobility(band sharpening and band alignment)and reducing lattice thermal conductivity(all-scale hierarchical defect structures designing).This systematic summary and analysis provide novel insights and perspectives for the development of thermoelectric materials.

关键词： PbSe and PbS thermoelectric materials Carrier concentration Density-of-state effective mass Carrier mobility Lattice thermal conductivity

The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends:The Acceleration for Both L-Poly(lactic acid)and Polypropylene

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Chinese Journal of Polymer Science 2024年第6期42卷 775-786页

作者： Shuang-Cheng Li Wei-Jia Zhou Wen-Jie Wu Jun Shao Shui-Liang Chen hao-Qing hou Sheng Xiang College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province Jiangxi Normal UniversityNanchang330022China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022China Wenzhou Institute University of Chinese Academy of SciencesWenzhou325001China

For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,but did not investigate in *** this study,the L-poly(lactic acid)/polypropylene(PLLA/PP)blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were *** showed that the crystalline structures of PLLA and PP were not altered by the *** the crystallization of PLLA,both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP *** the crystallization of PP,its crystallization rate was depressed under the existence of amorphous PLLA molecular *** the PP crystallized from the existence of PLLA crystals,although the diffusion rate of PP was reduced by PLLA crystals,the nucleation positions were obviously enhanced,which accelerated the formation of PP *** investigation would supply more basic data for the application of PLLA/PP blend.

关键词： L-poly(lactic acid) Polypropylene Blends Crystalization behavior Crystallization acceleration

Experimental Study on Vortex-Induced Vibration of Rough Risers with Coupling Interference Effect Under Side-by-Side Arrangement

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China Ocean Engineering 2024年第1期38卷 18-28页

作者： HU Ze-bo LIU Zhen LI Peng GUO Hai-yan WANG Shu-bing REN Xiao-hui hou hao WANG Ye-shuo College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China CHEC Dredging Co. LtdShanghai 200136China

A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined *** roughness of the riser was characterized by arranging different specifications of surface attachments on the surface of the *** risers with three different roughnesses were arranged side by side with smooth risers to explore the VIV response of the riser under the combined action of roughness and interference effect,and to reveal the coupling mechanism between roughness and interference *** experimental results show that,compared with that of a smooth riser,the VIV of a rough riser under the coupling interference effect has a wider"lock-in"region,and the displacement decreases more significantly at a high reduced velocity,which is more likely to excite higher-order modes and frequency *** addition,the displacement response and frequency response of the smooth riser are not significantly affected by wake interference from the rough riser,which is caused by the decrease of the wake region due to the delay of the boundary layer separation point of the rough riser.

关键词： marine riser vortex-induced vibration side-by-side arrangement roughness interference effect

Analysis and suppression of operational overvoltage and inrush current for high-speed trains by automatic phase-switching technique

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High Voltage 2024年第3期9卷 733-748页

作者： Ye Cao Song Xiao Zhizong Ye Guangning Wu Yujun Guo Guoqiang Gao Chuanming Sun Jiancheng Liu Zheng Chen hao hou Zijing Wang Puyang Liu Yuhui Zhang Jie Yu School of Electrical Engineering Southwest Jiaotong UniversityChengduChina Guangdong Power Grid Limited Liability Company China Southern Power GridGuangzhouChina CRRC Qingdao Sifang Co. Ltd.QingdaoChina State Grid Chongqing Electric Power Company ChongqingChina

When a high-speed train approaches the insulated phase-splitting section embedded between neighbouring power supply arms,the vacuum circuit breaker(VCB)installed on trains must be disconnected to maintain the traction power supply system as a no-load condition for completing phase-switching action,as the train passes through the phase-splitting section depending on its ***,when operating VCBs,the arc is easily triggered between the mobile contacts inside,accompanied by an overvoltage ***,to explore the generating mechanism of inrush current and operational overvoltage,a model describing the‘substation-catenary-train’traction power supply system is launched based on an equivalent circuit modelling *** the analysis of the transient VCB operational process,the phase of catenary voltage is directly related to the characteristics of the VCB switching-on overvoltage,as the traction cur-rent's phase angle is relevant to the amplitude-frequency characteristics of the VCB switching-off *** current as a noteworthy element is related to the traction transformer's *** automatic phase-switching technique is utilised to suppress both operational overvoltage and inrush current,as the optimal combination of VCB switching-on and switching-off phases considering the balance between overvoltage and inrush current is achieved based on the particle swarm algorithm.

关键词： traction phase inrush

Biomimetic natural biomaterials for tissue engineering and regenerative medicine:new biosynthesis methods,recent advances,and emerging applications

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Military Medical Research 2024年第1期11卷 50-79页

作者： Shuai Liu Jiang-Ming Yu Yan-Chang Gan Xiao-Zhong Qiu Zhe-Chen Gao Huan Wang Shi-Xuan Chen Yuan Xiong Guo-Hui Liu Si-En Lin Alec McCarthy Johnson V.John Dai-Xu Wei Hong-hao hou Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering the Fifth Affiliated HospitalSchool of Basic Medical ScienceSouthern Medical UniversityGuangzhou 510900China Department of Orthopedics Tongren HospitalShanghai Jiao Tong UniversityShanghai 200336China The Eighth Affiliated Hospital Sun Yat-Sen UniversityShenzhen 518033GuangdongChina Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325011ZhejiangChina Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Orthopaedics and Traumatology Faculty of Medicinethe Chinese University of Hong KongHong Kong SAR 999077China Department of Functional Materials Terasaki Institute for Biomedical InnovationLos AngelesCA 90064USA Mary&Dick Holland Regenerative Medicine Program College of MedicineUniversity of Nebraska Medical CenterOmahaNE 68130USA Zigong Affiliated Hospital of Southwest Medical University Zigong Psychiatric Research CenterZigong Institute of Brain ScienceZigong 643002SichuanChina Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationSchool of MedicineDepartment of Life Sciences and MedicineNorthwest UniversityXi’an 710127China

Biomimetic materials have emerged as attractive and competitive alternatives for tissue engineering(TE)and regenerative *** contrast to conventional biomaterials or synthetic materials,biomimetic scaffolds based on natural biomaterial can offer cells a broad spectrum of biochemical and biophysical cues that mimic the in vivo extracellular matrix(ECM).Additionally,such materials have mechanical adaptability,micro-structure interconnectivity,and inherent bioactivity,making them ideal for the design of living implants for specific applications in TE and regenerative *** paper provides an overview for recent progress of biomimetic natural biomaterials(BNBMs),including advances in their preparation,functionality,potential applications and future *** highlight recent advances in the fabrication of BNBMs and outline general strategies for functionalizing and tailoring the BNBMs with various biological and physicochemical characteristics of native ***,we offer an overview of recent key advances in the functionalization and applications of versatile BNBMs for TE ***,we conclude by offering our perspective on open challenges and future developments in this rapidly-evolving field.

关键词： Biomimic Scaffold Biosynthesis Natural biomaterial Tissue engineering

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河湖库淤积治理中底泥清淤的内涵与发展方向

水利学报 2024年第4期55卷 456-467页

作者：朱伟侯豪孙继鹏钟军王鑫牟彪河海大学水科学研究院江苏南京210098 河海大学土木与交通学院江苏南京210098 河海大学环境学院江苏南京210098

淤积问题对我国的水利事业影响深远,而底泥清淤是近些年淤积治理中经常采用的措施。针对底泥清淤的现状和存在问题,系统梳理了底泥清淤这一学科交叉领域的相关理论、技术和方法;阐述了对底泥清淤的概念、内涵、类型及基本问题的科学理解... 详细信息

淤积问题对我国的水利事业影响深远,而底泥清淤是近些年淤积治理中经常采用的措施。针对底泥清淤的现状和存在问题,系统梳理了底泥清淤这一学科交叉领域的相关理论、技术和方法;阐述了对底泥清淤的概念、内涵、类型及基本问题的科学理解;提出了淤积治理中底泥清淤必须明确的四大问题:为什么治理、治理什么、用什么方法治理以及对后续产物如何处置。依据淤积对河湖库产生的危害,可分为物理性淤积、化学性污染和生态性损害三种类型。分别讨论了工程清淤、环保清淤和生态清淤间的共性和差异。对底泥清淤工程在目的、目标、手段及后续处理处置方面的现状及存在问题进行了评述。未来底泥清淤势必成为一个长期存在的工程和管理行为,因此更加高效、低投入、绿色、可持续的底泥清淤技术,是行业必然的发展方向。

关键词：淤积治理底泥清淤底泥淤泥处理淤泥资源化尾水处理

2016—2022年太湖胥口湾水质变化及对水温、水位的响应

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生态与农村环境学报 2024年第4期40卷 469-477页

作者：朱伟尤星宇段志鹏吕艺侯豪河海大学环境学院江苏南京210098 河海大学土木与交通学院江苏南京210098

明确太湖胥口湾水质特征及对环境变化的响应有利于维系区域水资源安全。研究追踪2016—2022年胥口湾水质变化趋势,分析了水质指标对水温和水位的响应。结果显示,胥口湾水质环境总体稳定,且总氮(TN)、氨氮(NH_(3)-N)、总磷(TP)浓度和COD_... 详细信息

明确太湖胥口湾水质特征及对环境变化的响应有利于维系区域水资源安全。研究追踪2016—2022年胥口湾水质变化趋势,分析了水质指标对水温和水位的响应。结果显示,胥口湾水质环境总体稳定,且总氮(TN)、氨氮(NH_(3)-N)、总磷(TP)浓度和COD_(Mn)均呈下降趋势。但胥口湾水温年均值呈现快速上升趋势,上升幅度大于0.086℃·a^(-1),对该区域生态稳定性形成威胁。冗余分析显示,虽然水温和水位对胥口湾水质环境波动的贡献率低于5%,但水温变化显著影响了水质环境(P30℃)较为敏感,而高水位(>3.8 m)显著影响了NH_(3)-N、TN、TP和叶绿素a浓度。总体而言,胥口湾水环境总体稳定趋好,但受水位尤其是水温影响较大。研究结果可为极端天气下水质管理提供借鉴。

关键词：太湖胥口湾极端天气高水温高水位

清淤泥浆脱水-固化一体化工艺效果和机制研究

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岩土力学 2024年第2期45卷 443-453页

作者：林小蔚侯豪刘环季浪谈正伟朱伟河海大学岩土力学与堤坝工程教育部重点实验室江苏南京210098 河海大学土木与交通学院江苏南京210098 河海大学环境学院江苏南京210098

疏浚工程中清淤泥浆的含水率通常非常高,常采用先脱水为泥饼再进行固化的方法,处理效率相对较低。为此选择普通硅酸盐水泥和硫铝酸盐水泥作为固化材料,结合絮凝材料和板框压滤技术,对太湖清淤泥浆进行脱水-固化一体化工艺研究。通过比... 详细信息

疏浚工程中清淤泥浆的含水率通常非常高,常采用先脱水为泥饼再进行固化的方法,处理效率相对较低。为此选择普通硅酸盐水泥和硫铝酸盐水泥作为固化材料,结合絮凝材料和板框压滤技术,对太湖清淤泥浆进行脱水-固化一体化工艺研究。通过比阻试验和固化试验等手段,分析了该工艺中泥浆的脱水性能、固化效果的变化规律以及固化材料的损失情况。此外,还基于一体化工艺试验中泥浆的基本性质变化,讨论了固化材料流失的途径以及对泥浆脱水性能的影响机制。研究结果表明,采用脱水-固化一体化工艺能够改善清淤泥浆的粒径、压缩性,从而提高脱水特性,并且在工艺过程中固化材料的流失在9%以内,由于脱水泥饼性质更好,后续同样能够实现良好的固化效果。实际工程应用中,采用脱水固化一体化工艺可以提升泥浆处理的效率。

关键词：清淤泥浆脱水固化泥处理泥利用

中国气候政策不确定性指数:构建、分析与应用前景

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气候变化研究进展 2024年第3期20卷 361-372页

作者：陈国荣王苏萨邓晶侯浩一尹书琪冯玮曲浩泽北京林业大学经济管理学院北京100083 北京林业大学工学院北京100083

为确保“双碳”目标如期实现,中国政府加快了气候相关政策的制定和实施,可能导致气候政策不确定性升高,进而对社会经济产生影响,因此准确度量气候政策不确定性具有重要意义。基于2008—2023年中国13家主流新闻报纸的气候政策不确定性关... 详细信息

为确保“双碳”目标如期实现,中国政府加快了气候相关政策的制定和实施,可能导致气候政策不确定性升高,进而对社会经济产生影响,因此准确度量气候政策不确定性具有重要意义。基于2008—2023年中国13家主流新闻报纸的气候政策不确定性关键词频率,采用文本挖掘技术,构建了中国气候政策不确定性指数,并通过时间区间替换、国内外对比来验证指数的稳健性和有效性。结果发现:中国应对气候变化的政策可以划分为起步期、发展期、夯实期和深化期四个阶段,中国气候政策不确定性指数可以准确识别每个阶段的发展历程。与国外指数相比,中国气候政策不确定性指数不仅可以反映与中国相关的重大国际气候政策事件,也可以体现中国独特的气候政策变化和发展特点。该指数未来可以为政府部门制定气候政策、企业应对气候变化、金融机构管理气候风险、投资者提高投资效率等方面提供借鉴和参考。

关键词：中国气候政策不确定性指数文本分析