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Fluid Dynamics & Materials Processing 2024年第8期20卷 1773-1784页

作者： Yu Wang Mengyang Ma Yong Long Qingxiang Zhao Zhifei Cheng State Key Laboratory of Bridge Intelligent and green construction China Railway Major Bridge Engineering Group Co.Ltd.Wuhan430034China China Railway Bridge Science Research Institute. Ltd.Wuhan430034China

Shrinkage-induced cracking is a co.mon issue in co.crete structures,where the formation of cracks not only affects the aesthetic appearance of co.crete but also potentially reduces its durability and *** this study,the effect of ceramsite sand addition on the properties of a ternary system of cement-ground granulated blast furnace slag(GGBFS)-phosphogypsum(PG)is *** particular,the fluidity,rheology,hydration heat,co.pressive strength,autogenous shrinkage,and drying shrinkage of the co.sidered mortar specimens are *** results indicate that an increase in PG co.tent leads to a decrease in fluidity,higher visco.ity,lower exothermic peak,and lower co.pressive ***,the shrinkage of the mortar specimens is effectively *** inco.poration of internal curing water from ceramsite sand improves fluidity,decreases both yield stress and visco.ity,enhances the degree of hydration,and induces mortar ***,the inferior mechanical properties of the ceramsite sand generally produce a decrease in the co.pressive strength.

关键词： Phosphogypsum ceramsite sand internal curing mechanical property shrinkage

The noise spectral characteristics and noise reduction schemes of screw air-source heat pump:A case study

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Building Simulation 2024年第1期17卷 53-70页

作者： Dongsheng Liu Yaohan Feng Jikang Jia Pengfei Si Ya Feng China Southwest Architecture Design and Research Institute co.Ltd. Chengdu 610041China CSCEC green construction Engineering Research Center Chengdu 610041China

The screw air-source heat pump can cause incessant high noise levels during operation,which might hinder adoption of this energy-efficient heat ***,aco.stic measurements and co.parison testing were performed in this *** measurements revealed that the co.pressor is the main noise source of the heat pump,and it shows a multipeak frequency distribution and a wide frequency spectrum under different work co.ditions,with multiple peaks at 63,250,and 1000 ***,a co.pressor sound insulation co.er with broadband absorption was proposed,and it was experimentally proven that the insulation co.er can reduce the maximum sound pressure level of one unit from 89.8 dBA to 79.1 ***,we proposed several noise reduction strategies and co.pared their noise reduction effects using co.puter *** results showed that the noise problem can be effectively improved through the rational design of the sound barrier and the layout and opening options of heat *** distance between the sound barrier and heat pump and the sound attenuation due to diffraction ALa exhibit a U-shaped *** buildings of different heights,the optimal heights of noise barrier are *** 5.5-meter is the optimal height of the sound barrier for single-story *** co.clusions can be applied to other building projects for heat pump noise reduction.

关键词： aco.stic simulation broadband noise noise reduction air-source heat pump sound barrier

Experimental and numerical investigation of the flexural performance of channel steel-bolt joint for prefabricated subway stations

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 918-935页

作者： Lei WANG Shengyang ZHOU Xiangsheng CHEN Xian LIU Shuya LIU Dong SU Shouchao JIANG Qikai ZHU Haoyu YAO co.lege of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of co.stal Urban Resilient Infrastructures(MOE) Shenzhen UniversityShenzhen 518061China Shenzhen Key Laboratory of green Efficient and Intelligent Construction of Underground Metro StationShenzhen UniversityShenzhen 518061China co.lege of Civil Engineering Tongji UniversityShanghai 200092China Shenzhen Municipal Design&Research co. Ltd.Shenzhen 518029China Shenzhen Metro Group co. Ltd.Shenzhen 518026China

Flexural performance of joints is critical for prefabricated *** study presents a novel channel steel-bolt(CB)joint for prefabricated subway ***-scale tests are carried out to investigate the flexural behavior of the CB joint under the design loads of the test-case *** addition,a three dimensional(3D)finite element(FE)model of the CB joint is established,inco.porating visco.s co.tact to simulate the bonding and detachment behaviors of the interface between channel steel and *** on the 3D FE model,the study examines the flexural bearing mechanism and influencing factors for the flexural performance of the CB *** results indicate that the flexural behavior of the CB joint exhibits significant nonlinear characteristics,which can be divided into four *** illustrate the piecewise linearity of the bending moment-rotational angle curve,a four-stage simplified model is proposed,which is easily applicable in engineering *** study reveals that axial force can enhance the flexural capacity of the CB joint,while the preload of the bolt has a negligible *** flexural capacity of the CB joint is approximate twice the value of the designed bending moment,demonstrating that the joint is suitable for the test-case station.

关键词： channel steel-bolt joint flexural performance full-scale test numerical simulation prefabricated subway station

Recent advances in photochemistry for positron emission tomography imaging

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Chinese Chemical Letters 2024年第8期35卷 149-162页

作者： Jing-Jing Zhang Lujun Lou Rui Lv Jiahui Chen Yinlong Li Guangwei Wu Lingchao Cai Steven H.Liang Zhen Chen Jiangsu co.Innovation Center of Efficient Processing and Utilization of Forest Resources Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest BiomassJiangsu Key Lab of Biomass-Based Green Fuels and ChemicalsInternational Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Department of Radiology and Imaging Sciences Emory UniversityAtlantaGA 30322United States

As a powerful noninvasive imaging technology,positron emission tomography(PET)has been playing an important role in disease theranostics and drug *** successful application of PET relies on not only the biological properties of PET tracers but also the availability of facile and efficient radiochemical reactions to enable practical production and widespread use of PET *** recently,photochemistry is emerging as a novel,mild and efficient approach to generating PET *** this review,we focus on the recent advances in newly developed photocatalytic radiochemical reactions,innovation on automated photochemical radiosynthesis modules,as well as implementation in late-stage radiolabeling and radio-pharmaceutical synthesis for PET *** believe that this review will inspire the development of more promising radiolabeling protoco.s for the preparation of clinically useful PET agents.

关键词： Positron emission tomography(PET) Fluorine-18 Carbon-11 Photocatalysis Automation Late-stage functionalization

Selective photosynthesis of imines from biomass-derived aldehydes over Ni/TiO_(2)

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Rare Metals 2024年第3期43卷 1116-1124页

作者： Wu-Lin Li Qing-Qing Zhang Lin Dong Wen-Jun Zhang Li-Li Lin Zu-Peng Chen Jiangsu co.Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing210037China Institute of Industrial Catalysis State Key Laboratory of Green Chemistry Synthesis TechnologyCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou310014China

Photocatalytic reductive amination of biomass-derived aldehydes is a desirable way to selectively upgrade biomass into value-added nitrogen-co.taining chemicals under mild ***,it is challenging to produce imines in high selectivity because of the undesirable side reactions caused by the activity of functional ***,we demonstrate the highly reactive and selective production of imines from biomass derived aldehydes via the photocatalytic reductive amination,using a defective TiO_(2)supported nickel *** employment of methanol as the hydrogen donor and ammonia solution as the nitrogen source avoids the use of high-pressure H_(2)and expensive amines,rendering the current catalytic process safe,eco.omical,and environmentally *** depth investigations attribute the improved separation and transfer of photogenerated charge carriers to the presence of oxygen vacancies and deco.ated Ni nanoparticles,thereby accelerating the production of imines from benzaldehyde amination(co.version,95.8%;seleetivity,95.2%).Furthermore,the developed system co.ld be easily translated to the photocatalytic co.versions of various biomass derived aldehydes,which provided an example of a co.t-effective and sustainable approach for the valorization of biomass derived feedstocks.

关键词： Photocatalysis Biomass derivatives Imines Reduction amination Heterogeneous catalyst

Optimal scheduling of a township integrated-energy system using the adjustable heat-electricity ratio model

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Global Energy Interco.nection 2024年第1期7卷 48-60页

作者： Quan Chen Jingyi Wang Min Cang Xiaomeng Zhai Xi Cheng Shuang Wu Dongwei Li Eco.omic and Technology Research Institute of State Grid Jiangsu Electric Power co. LtdNanjing210008P.R.China Power construction Technical and Eco.omic co.sulting Center of China Electricity co.ncil Beijing100053P.R.China

With the expansion and implementation of rural revitalization strategies,there is a co.stant need for new energy sources for the construction of new ***,integrated energy systems with the interco.nection and interaction of multiple energy sources are developing *** energy,a renewable green energy source with low pollution and wide distribution,has significant application potential in integrated energy *** the application of biomass energy in townships,this study established an integrated biomass energy system and proposed a model to optimize its *** eco.omic co.t and highest clean energy utilization rate were co.sidered as the objective *** addition,a plan was suggested to adjust the heat-electricity ratio based on the characteristics of the co.bined heat and power of the ***,a simulation analysis co.ducted for a town in China was discussed,demonstrating that the construction of a township integrated-energy system and the use of biomass can significantly reduce operating co.ts and improve the energy utilization ***,by adjusting the heat-electricity ratio,the eco.omic co.t was further reduced by 6.70%,whereas the clean energy utilization rate was increased by 5.14%.

关键词： Biomass energy Integrated-energy system Afterburning device Heat-electricity ratio Operation optimization

Hydrodechlorination of trifluoro-trichloroethane to chlorotrifluoroethylene:Revealing the deactivation mechanism and regeneration strategy of Pd-Cu/AC catalyst

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Chinese Journal of Chemical Engineering 2024年第6期70卷 261-268页

作者： Song Tian Yicheng Chen Xiaoyu Wen Bingcheng Li Jian Lu Zile Li Feng Feng Qingtao Wang Qunfeng Zhang Xiaonian Li State Key Laboratory Breeding Base of green Chemistry Synthesis Technology Institute of Industrial Catalysis of Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Fluorine&Nitrogen chemicals Xi'an Modern Chemistry Research InstituteXi'an 710065China

Chlorotrifluoroethylene(CTFE)is a vital fluorinated olefinic monomer produced through the catalytic hydrodechlorination of trichlorotrifluoroethane(CFC-113),an eco.friendly ***,hydrodechlorination catalysts for olefin production often suffer from poor *** Pd/AC catalyst and Pd-Cu/AC catalyst prepared by co.impregnation method exhibited poor stability,Pd-Cu/AC catalyst with CFC-113 co.version dropping to around 37%after 50 h of hydrodechlorination ***-Emmett-Teller,transmission electron microsco.y,X-ray photoelectron spectrosco.y,and X-ray diffraction of fresh and deactivated Pd/AC catalysts indicate that the deactivation of Pd/AC catalysts is due to high-temperature agglomeration of *** analysis of fresh and deactivated Pd-Cu/AC catalysts using Brunauer-Emmett-Teller,transmission electron microsco.y,and thermogravimetric analysis techniques revealed decreased dispersion of active sites,reduced surface area,catalyst aggregation deactivation,and a significant decrease in Cu ***,the results of NH3-TPD revealed that the acid sites of the catalyst increased significantly.X-ray diffraction spectra indicated the formation of new species,basic co.per chloride(Cu_(2)(OH)_(3)Cl),during the *** the reaction progressed,these new species agglomerated,leading to a gradual loss of catalyst ***,the deactivated catalyst was successfully reactivated using a simple alkaline washing method.

关键词： CFC-113 Hydrodechlorination Chlorotrifluoroethylene Catalyst deactivation

Research on Quality Management Measures of green Building construction

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Journal of Architectural Research and Development 2024年第3期8卷 8-13页

作者： Jie Hong Xiang Xu Zhongtian construction Group co. Ltd.Dongyang 322100Zhejiang ProvinceChina

Urbanization has led to the rapid development of the construction ***,this has also led to higher requirements for the construction engineering *** than the quality monitoring of engineering construction,the energy-saving properties of the building should also be ***,a scientific management approach should be adopted to improve green building *** paper primarily examines the importance of quality management in green building construction,along with the factors influencing *** also identifies the quality issues present in current green building ***,it proposes measures for quality management in the green building construction process to facilitate the industry’s healthy development.

关键词： green building engineering construction process co.trol Quality management construction publicity

Synergy of heterogeneous co.Ni dual atoms enabling selective C-O bond scission of lignin co.pling with in-situ N-functionalization

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Journal of Energy Chemistry 2024年第5期92卷 16-25页

作者： Baoyu Wang Jinshu Huang Hongguo Wu Ximing Yan Yuhe Liao Hu Li National Key Laboratory of green Pesticide Key Laboratory of Green Pesticide&Agricultural BioengineeringMinistry of EducationState-Local Joint Laboratory for Comprehensive Utilization of BiomassCollege of Pharmacy&Center for R&D of Fine ChemicalsGuizhou UniversityGuiyang 550025GuizhouChina Guangxi Key Laboratory of green Chemical Materials and Safety Technology Beibu Gulf UniversityQinzhou 535011GuangxiChina Guangzhou Institute of Energy co.version Chinese Academy of SciencesGuangzhou 510640GuangdongChina

Selective cleavage of Csp^(2)-OCH_(3)bond in lignin without breaking other types of C-O bonds followed by N-functionalization is fascinating for on-purpose valorization of ***,a co.Ni-based dual-atom catalyst co.iDA@NC prepared by in-situ evaporation and acid-etching of metal species from tailor-made metal–organic frameworks was efficient for reductive upgrading of various lignin-derived phenols to cyclohexanols(88.5%–99.9%yields),which had ca.4 times higher reaction rate than the single-atom catalyst and was superior to state-of-the-art heterogeneous *** synergistic catalysis of co.Ni dual atoms facilitated both hydrogen dissociation and hydrogenolysis steps,and co.ld optimize adsorption co.figuration of lignin-derived methoxylated phenols to further favor the Csp^(2)-OCH_(3)cleavage,as elaborated by theoretical ***,the co.i_(DA)@NC catalyst was highly recyclable,and exhibited excellent demethoxylation performance(77.1%yield)in real lignin monomer *** in-situ cascade co.version processes assisted by dual-atom catalysis,various high-value N-co.taining chemicals,including caprolactams and cyclohexylamines,co.ld be produced from lignin.

关键词： Biomass co.version Heterogeneous catalysis Lignin Dual-atom catalyst Selective C-ocleavage

Silico. dioxide-protection boosting the peroxidase-like activity of Fe single-atom catalyst for co.bining chemo-photothermal therapy

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Nano Research 2024年第6期17卷 4924-4933页

作者： Yu Fan Yu Yi Hongpan Rong Jiatao Zhang Beijing Key Laboratory of construction-Tailorable Advanced Functional Materials and green Applications School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China CAS Center for Excellence in Nanoscience CAS KeyLaboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information TechnologySchool of Chemistry&Chemical EngineeringBeijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Carbon-based single-atom catalysts(SACs)have been widely studied in the field of biomedicine due to their excellent catalytic ***,carbon-based SACs usually aggregate during pyrolysis,which leads to the reduction of catalytic ***,we describe a method to improve the monodispersion of SACs using silico. dioxide as a protective *** deco.ation of silico. dioxide serves as a buffer layer for individual nanoparticles,which is not destroyed during the pyrolysis process,ensuring the single-particle dispersion of the nanoparticles after *** approach increased the hydroxyl groups on the surface of Fe-SAC(Fe-SAC-SE)and improved its water solubility,resulting in a four times enhancement of the peroxidase(POD)-like activity of Fe-SAC-SE(58.4 U/mg)than that of non-protected SACs(13.9 U/mg).The SiO_(2)-protection approach co.ld also improve the catalytic activities of SACs with other metals such as Mn,co.Ni,and Cu,indicating its generality for SACs *** advantage of the high POD-like activity,photothermal properties,and large specific surface area of Fe-SAC-SE,we co.structed a synergistic therapeutic system(Fe-SAC-SE@DOX@PEG)for co.bining the photothermal therapy,catalytic therapy,and *** was verified that the photothermal properties of Fe-SAC-SE@DOX@PEG co.ld effectively improve its POD-like activity,exhibiting excellent tumor-killing performance at the cellular *** work may provide a general approach to improve the performances of SACs for disease therapy and diagnosis.

关键词： single-atom catalysts peroxidase-like activity SiO2-protection photothermal therapy catalytic therapy chemotherapy