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Coupling effect of cement-stabilization and biopolymer-modification on the mechanical behavior of dredged sediment

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3284-3298页

作者： Lei Lang Jiangshan Li xiao Huang ping Wang Wei Zhang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan430071China University of Chinese Academy of Sciences Beijing100049China

Nowadays,biopolymer stabilization as a promising eco-friendly approach in soft ground improvement has attracted wide ***,the feasibility of using biopolymer as a green additive of cementstabilized dredged sediment(CDS)with high water content is still *** this study,guar gum(GG)and xanthan gum(XG)were adopted as typical biopolymers,and a series of unconfined compressive strength(UCS),splitting tensile strength(STS)and scanning electron microscopy(SEM)tests were performed to evaluate the mechanical and microstructural properties of XG-and GG-modified CDSs considering several factors including biopolymer modification,binderesoil ratio and wateresolid ***,the micro-mechanisms revealing the evolutions of mechanical properties of biopolymermodified CDS were *** results indicate that the addition of XG can effectively improve the strength of CDS,while the GG has a side *** XG content of 9%was recommended,which can improve the 7 d-and 28 d-UCSs by 196%and 51.8%,together with the 7 d-and 28 d-STSs by 118.3%and 42.2%,*** the binderesoil ratio or decreasing the wateresolid ratio significantly improved the strength gaining but aggravated the brittleness characteristics of *** XG to CDS contributed to the formation of microstructure with more compactness and higher cementation degrees of ordinary Portland cement(OPC)-XG-stabilized DS(CXDS).The micro-mechanism models revealing the interactions of multiple media including OPC cementation,biopolymer film bonding and bridging effects inside CXDS were *** key findings confirm the feasibility of XG modification as a green and high-efficiency mean for improving the mechanical properties of CDS.

关键词： Dredged sediment(DS) Stabilization Biopolymer modification Mechanical properties Micro-mechanism

Application of a microscopic optical potential of chiral effective field theory in (p, d) transfer reactions

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Nuclear Science and Techniques 2024年第1期35卷 134-144页

作者： Yi-ping Xu Si-Lu chen Dan-Yang Pang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China School of Physics Beihang UniversityBeijing 100191China

The microscopic global nucleon–nucleus optical model potential(OMP)proposed by Whitehead,Lim,and Holt,the WLH potential(Whitehead et al.,Phys Rev Lett 127:182502,2021),which was constructed in the framework of many-body per-turbation theory with state-of-the-art nuclear interactions from chiral effective field theory(EFT),was tested with(p,d)transfer reactions calculated using adiabatic wave *** target nuclei included both stable and unstable nuclei,and the incident energies reached 200 *** results were compared with experimental data and predictions using the phenomenological global optical potential of Koning and Delaroche,the KD02 ***,we found that the micro-scopic WLH potential described the(p,d)reaction angular distributions similarly to the phenomenological KD02 potential;however,the former was slightly better than the latter for radioactive *** average,the obtained spectroscopic factors(SFs)using both microscopic and phenomenological potentials were similar when the incident energies were below approxi-mately 120 ***,their difference tended to increase at higher incident energies,which was particularly apparent for the doubly magic target nucleus 40Ca.

关键词： Microscopic optical model potential (p,d)transfer Spectroscopic factors

Sparse-view neutron CT 3D image reconstruction algorithm based on split Bregman method

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Nuclear Science and Techniques 2024年第9期35卷 41-55页

作者： Teng-Fei Zhu Yang Liu Zhi Luo xiao-ping Ouyang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi’an 710024China

As a complement to X-ray computed tomography(CT),neutron tomography has been extensively used in nuclear engineer-ing,materials science,cultural heritage,and industrial *** of the attenuation matrix for neutron tomography with a traditional analytical algorithm requires hundreds of projection views in the range of 0°to 180°and typically takes several hours to *** a low time-resolved resolution degrades the quality of neutron *** the number of projection acquisitions is an important approach to improve the time resolution of images;however,this requires efficient reconstruction ***,sparse-view reconstruction algorithms in neutron tomography need to be *** this study,we investigated the three-dimensional reconstruction algorithm for sparse-view neu-tron CT *** enhance the reconstructed image quality of neutron CT,we propose an algorithm that uses OS-SART to reconstruct images and a split Bregman to solve for the total variation(SBTV).A comparative analysis of the performances of each reconstruction algorithm was performed using simulated and actual experimental *** to the analyzed results,OS-SART-SBTV is superior to the other algorithms in terms of denoising,suppressing artifacts,and preserving detailed structural information of images.

关键词： Neutron CT OS-SART Sparse-view 3D reconstruction Split Bregman Total variation

Metal-organic frameworks on 3D interconnected macroporous sponge foams for large-scale water decontamination:A mini review

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Chinese Chemical Letters 2024年第5期35卷 77-84页

作者： xiao-Hong Yi Chong-chen Wang Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China

Water pollution caused by global population growth,urban expansion and industrialization development is one of the urgent issues that need to be addressed in the 21st *** to now,it was challenging for metal-organic frameworks(MOFs)to be used in the actual water treatment due to that the powder MOFs suffered from difficult reuse,poor water stability and easy *** is an effective strategy to immobilize MOFs powder onto porous sponge foam carriers for accomplishing large flux,facile recycling,easy processing water treatment *** this review article,the fabrication approaches and applications of different MOFs/sponge composites were highlighted,in which the fluorescence detection of pollutants,adsorption and separation of pollutants,catalytic reduction and oxidation of pollutants were ***,the future challenges and opportunities of MOF/sponge for water treatment are proposed,aiming to provide in-depth guidance for the future design and manufacture of the immobilized MOFs onto sponge foams.

关键词： Metal-organic frameworks Sponge foam Water decontamination Adsorption Catalysis

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肝移植时代的肝脏外科

中华外科杂志 2007年第9期45卷 580-583页

作者：陈孝平华中科技大学同济医学院附属同济医院肝脏外科中心武汉430030

肝脏外科是一个古老而又充满生机的学科。早在1888年，德国医生Langenbuch就成功地施行了肝左叶切除手术。从那时起至今，肝脏外科不断发展，日趋完善，始终充满活力。特别是近30年来，随着麻醉学、围术期处理的进展，新材料、新技术、... 详细信息

肝脏外科是一个古老而又充满生机的学科。早在1888年，德国医生Langenbuch就成功地施行了肝左叶切除手术。从那时起至今，肝脏外科不断发展，日趋完善，始终充满活力。特别是近30年来，随着麻醉学、围术期处理的进展，新材料、新技术、新方法的应用以及肝脏解剖研究的深入，推动了肝脏外科突飞猛进地发展。而在所有的重大进展中，肝移植的出现对肝脏外科产生的影响最为广泛和深远，甚至可以说是划时代的。

关键词：肝脏外科肝移植围术期处理切除手术肝脏解剖肝左叶麻醉学新材料

不断进行技术改进与创新提高肝切除术的安全性

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中华外科杂志 2009年第1期47卷 25-26页

作者：陈孝平中华外科杂志副总编辑华中科技大学同济医学院附属同济医院外科学系武汉430030

肝切除包括手术方式、控制出血和断离肝实质技术等3个主要方面。回顾肝切除术发展轨迹，不难看出手术技术的改进与创新，是完善肝切除手术操作和提高手术安全性的重要基础。一、肝切除手术方式直到19世纪末期，外科医生还一直将镰状韧... 详细信息

肝切除包括手术方式、控制出血和断离肝实质技术等3个主要方面。回顾肝切除术发展轨迹，不难看出手术技术的改进与创新，是完善肝切除手术操作和提高手术安全性的重要基础。一、肝切除手术方式直到19世纪末期，外科医生还一直将镰状韧带作为肝脏的左、右分界，将肝脏分为左、右两叶。1898年Cantlie通过肝脏腐蚀标本发现，人的肝左右叶不是以镰状韧带分界的，

关键词：肝切除术手术安全性技术改进手术方式镰状韧带控制出血手术技术手术操作

Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

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Journal of Hydrodynamics 2024年第1期36卷 142-157页

作者： Xue-qin Ji xiao-song Zhang chen-jun Yang xiao-qian Dong State Key Laboratory of Ocean Engineering Marine Numerical Experiment CentreSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China CSSC Shanghai Marine Energy Saving Technology Co. Ltd.Shanghai200011China China Ship Scientific Research Center Shanghai Branch Shanghai200011China

The tip-clearance flow in a pump-jet propulsor exerts great impacts on the fluctuating pressures and resultant unsteady forces,which are important sources of structural vibrations and radiated noise *** blade geometry close to the tip is an important factor determining the vortex strength in the tip-clearance *** the open-water condition,the effects of raking the rotor tips on the duct-surface fluctuating pressures and the resultant unsteady forces acting on different components of the propulsor are investigated via physical model experiments and the numerical solution of Reynolds-averaged Navier-Stokes(RANS)equations coupled with the SST k-ωturbulence *** measured and simulated results of hydrodynamic pressures are consistent to each other,and the simulated flows help better understand why the fluctuating pressures change with the tip *** strong fluctuations of duct-surface pressures are caused by intensive tip separation *** duct-surface pressure fluctuations are effectively reduced by using the rake distribution near the tip towards blade back side and,for the combination of the five-bladed rotor and the seven-bladed stator,the resultant unsteady horizontal(and vertical)forces acting on the duct and stator are also reduced;while increasing rake leads to negative effect on pressure fluctuations and unsteady horizontal(and vertical)forces acting on all the components of the propulsor.

关键词： Pump-jet tip-clearance tip-rake fluctuating pressures excitation forces

父亲协同教养对儿童亲社会行为的影响：安全感和人际信任的链式中介作用

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中国临床心理学杂志 2019年第4期27卷 803-807页

作者：陈小萍安龙咸阳师范学院教育科学学院

目的:探讨儿童安全感和人际信任在父亲协同教养与儿童亲社会行为间的链式中介作用。方法:采用父亲协同教养问卷、亲社会行为量表、儿童人际信任问卷、安全感量表对432名中小学生进行调查。结果:①相关分析显示父亲协同教养、安全感、人... 详细信息

目的:探讨儿童安全感和人际信任在父亲协同教养与儿童亲社会行为间的链式中介作用。方法:采用父亲协同教养问卷、亲社会行为量表、儿童人际信任问卷、安全感量表对432名中小学生进行调查。结果:①相关分析显示父亲协同教养、安全感、人际信任与儿童亲社会行为两两之间存在显著正相关。②安全感和人际信任分别在父亲协同教养与儿童亲社会行为间起中介作用;安全感和人际信任在父亲协同教养与儿童亲社会行为间起链式中介作用。结论:父亲协同教养除了直接影响儿童亲社会行为外,还通过安全感和人际信任的链式中介作用间接影响儿童亲社会行为。

关键词：亲社会行为父亲协同教养人际信任安全感儿童

由结果到过程的控制——当前运动训练科学化的一个重要发展趋势

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武汉体育学院学报 2007年第8期41卷 1-5,16页

作者：陈小平清华大学体育部北京100084

结果是指专项运动成绩或构成专项运动成绩的能力要素,是对竞技能力水平综合和静态的描述,是一个阶段训练的成果;过程是对一个训练阶段或一个具体练习手段的动态描述,是对造成结果原因的分析。对运动员训练过程的关注是运动训练科学化水... 详细信息

结果是指专项运动成绩或构成专项运动成绩的能力要素,是对竞技能力水平综合和静态的描述,是一个阶段训练的成果;过程是对一个训练阶段或一个具体练习手段的动态描述,是对造成结果原因的分析。对运动员训练过程的关注是运动训练科学化水平提高的具体体现,它可以更加真实、深入地了解和认识项目特征,在源头形成正确的训练方向;更加突出运动训练的系统性,全面和完整地把握训练和比赛的全过程;更加强调动态和变化,从体能和技术两方面控制运动员的训练。

关键词：陈小平运动训练结果过程控制