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学者姓名:杨政险
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The production of concrete involves substantial consumption of non-renewable resources, while the high porosity of pervious concrete makes it prone to colonization by microorganisms, causing clog and strength loss. This study develops photocatalytic alkali-activated steel slag pervious concrete (PASSPC) utilizing Cu-ZnO/gC3N4 hybrid hetero-microspheres as the photocatalyst, steel slag and ground granulated blast furnace slag as the blended binder, and coarse steel slag as the aggregate. The photocatalytic antibacterial properties, volume stability, and strength of PASSPC with different contents of Cu-ZnO/g-C3N4 were investigated. The antibacterial mechanism of PASSPC was investigated using electron paramagnetic resonance and the results revealed that with 1.2 wt% Cu-ZnO/g-C3N4 (by weight to binder) addition, PASSPC reached a 99.68 % antibacterial ratio under visible light irradiation. Cu-ZnO/g-C3N4 exhibits a dual effect on PASSPC by delaying binder hardening while promoting hydration in later stages, resulting in decreased 3 d compressive strength, followed by increased 28 d compressive strength compared to the blank samples. In addition, Cu-ZnO/g-C3N4 improves the microstructure and interfacial transition zone of PASSPC, effectively mitigating the adverse effects of steel slag instability through a dual buffering mechanism provided by macro- and micro-pores.
Keyword :
Antibacterial properties Antibacterial properties Cu-ZnO/g-C3N4 hybrid hetero-microspheres Cu-ZnO/g-C3N4 hybrid hetero-microspheres Pervious concrete Pervious concrete Steel slag Steel slag Visible light irradiation Visible light irradiation
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GB/T 7714 | Li, Kang , Yang, Zhengxian , Lu, Lin et al. The antibacterial and engineering properties of steel slag based pervious concrete incorporated with Cu-ZnO/g-C3N4 hybrid hetero-microspheres [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 460 . |
MLA | Li, Kang et al. "The antibacterial and engineering properties of steel slag based pervious concrete incorporated with Cu-ZnO/g-C3N4 hybrid hetero-microspheres" . | CONSTRUCTION AND BUILDING MATERIALS 460 (2025) . |
APA | Li, Kang , Yang, Zhengxian , Lu, Lin , Li, Yiming , Wang, Wencheng , Duan, Jizhou et al. The antibacterial and engineering properties of steel slag based pervious concrete incorporated with Cu-ZnO/g-C3N4 hybrid hetero-microspheres . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 460 . |
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Ternary blended cement represents a promising option for effectively reducing CO2 emissions caused by cement production. This study examines the hydration kinetics of ternary cement containing ultrafine steel slag (USS) and blast-furnace slag (BFS) at elevated temperatures. The results reveal that high-temperature curing significantly accelerates the hydration kinetics of the ternary cement. The governing mechanism of the hydration reaction evolves with increasing temperature. The hydration rate at 60 degrees C experiences a notable acceleration, accompanied by a decrease in the induction period and an enhancement alumina reaction, transitioning the hydration kinetics from NG-*I-*D to NG-*D. The low reactivity and inert components of USS lead to the tendency of forming a relatively loose microstructure of hardened paste. In contrast, the flocculent C(-A)-S-H gel formed after incorporating BFS contributes to a denser and more uniform microstructure, owing to the synergistic hydration effect between USS and BFS. Moreover, increasing the temperature promotes the hydration reactions of f-CaO and f-MgO, thereby enhancing the apparent density of the reaction products and reducing the risk caused by volume instability. The findings address a key limitation of SS-based binders and emphasizes the potential of USS-BFS ternary cement as a sustainable alternative with reduced environmental impact.
Keyword :
Hydration kinetics Hydration kinetics Microstructure Microstructure Synergistic hydration effect Synergistic hydration effect Temperature Temperature Ternary cement Ternary cement
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GB/T 7714 | Li, Kang , Yang, Zhengxian , Dong, Shilin et al. Hydration heat and kinetics of ternary cement containing ultrafine steel slag and blast-furnace slag at elevated temperatures [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 471 . |
MLA | Li, Kang et al. "Hydration heat and kinetics of ternary cement containing ultrafine steel slag and blast-furnace slag at elevated temperatures" . | CONSTRUCTION AND BUILDING MATERIALS 471 (2025) . |
APA | Li, Kang , Yang, Zhengxian , Dong, Shilin , Ning, Pingping , Ye, Dejun , Zhang, Yong . Hydration heat and kinetics of ternary cement containing ultrafine steel slag and blast-furnace slag at elevated temperatures . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 471 . |
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To examine the effect of flocculation treatment on slurry clogging during vacuum preloading, this study conducted vacuum preloading model tests using lime, anionic polyacrylamide (APAM), and the dual use of polyaluminum chloride (PAC) and APAM in conjunction with particle image velocimetry (PIV) analysis. The results demonstrated that flocculation treatment enhanced the efficiency of vacuum preloading and mitigated the clogging of slurry. Compared to untreated slurry, the lime-flocculated slurry exhibited an approximately 248% increase in pore water pressure dissipation, a 462% increase in clogging zone width, and an 80% improvement in slurry strength near the PVD. The dual use of PAC and APAM significantly improved the slurry's filtration performance by approximately 77 s, resulting in the highest water discharge rate (47% higher than untreated slurry) under vacuum pressure. In contrast, APAM alone enhanced the water discharge rate primarily in the early stages of vacuum preloading but had a limited effect on the final water discharge volume and horizontal strain. Furthermore, this study investigated the evolution of the clogging zone in flocculated slurry and elucidated the underlying mechanism of flocculation in mitigating the clogging of slurry. The findings can provide a theoretical basis for the selection of flocculants and the arrangement of PVDs in large-scale land reclamation and dredged slurry treatment projects.
Keyword :
clogging clogging dredged slurry dredged slurry flocculation flocculation particle image velocimetry particle image velocimetry vacuum preloading vacuum preloading
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GB/T 7714 | Lu, Jingling , Zhang, Xuexing , Yang, Zhengxian et al. Flocculation Treatment for Mitigating Clogging of Dredge Slurry Under Vacuum Preloading with Particle Image Velocimetry Analysis [J]. | APPLIED SCIENCES-BASEL , 2025 , 15 (6) . |
MLA | Lu, Jingling et al. "Flocculation Treatment for Mitigating Clogging of Dredge Slurry Under Vacuum Preloading with Particle Image Velocimetry Analysis" . | APPLIED SCIENCES-BASEL 15 . 6 (2025) . |
APA | Lu, Jingling , Zhang, Xuexing , Yang, Zhengxian , Xu, Shanlin . Flocculation Treatment for Mitigating Clogging of Dredge Slurry Under Vacuum Preloading with Particle Image Velocimetry Analysis . | APPLIED SCIENCES-BASEL , 2025 , 15 (6) . |
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This review paper carefully examines ion-doped non-hydraulic calcium silicates' carbonation behavior and properties, notably gamma-C2S, C3S2, and CS, emerging as viable materials for sustainable construction applications. The carbonation process of these materials offers the combined benefits of increased durability and CO2 sequestration, providing a potential pathway to mitigate the environmental impact of conventional cement. Through foreign ion doping (e.g., barium, magnesium, and sodium), carbonation reactivity and compressive strength are significantly enhanced due to the formation of stable calcium carbonate polymorphs (such as calcite and aragonite) and densified matrices. Magnesium doping is noted for its efficacy, yielding a 40 % enhancement in carbonation reactivity and an increase of up to 115 MPa in compressive strength of gamma-C2S under optimal curing conditions. Key experimental parameters, such as CO2 concentration, temperature, and relative humidity, influence carbonation reactivity and are essential for the pilot-scale application of these materials in the construction industry. The review also discusses future research directions, including the potential for multi-dopant systems, AI-based curing optimization, and long-term durability studies under varied environmental conditions. This review provides a fundamental perspective on the current advances and challenges of using ion-doped nonhydraulic calcium silicates as sustainable binders in the construction sector.
Keyword :
Calcium silicates Calcium silicates Carbonation properties Carbonation properties Carbon sequestration Carbon sequestration Ion-doped Ion-doped
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GB/T 7714 | Ndzila, Jaures Syntyche , Yang, Zhengxian . Carbonation properties of ion-doped non-hydraulic calcium silicate binders: A review [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 105 . |
MLA | Ndzila, Jaures Syntyche et al. "Carbonation properties of ion-doped non-hydraulic calcium silicate binders: A review" . | JOURNAL OF BUILDING ENGINEERING 105 (2025) . |
APA | Ndzila, Jaures Syntyche , Yang, Zhengxian . Carbonation properties of ion-doped non-hydraulic calcium silicate binders: A review . | JOURNAL OF BUILDING ENGINEERING , 2025 , 105 . |
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The steel slag and ground granulated blast furnace slag with high fineness exhibit synergistic effects on hydration progress and can be introduced into concrete in high volume. In this paper, the simulated pore solution (SPS) of ternary cement incorporating ultrafine steel slag (US) and ultrafine ground granulated blast furnace slag (UG) was prepared to examine the passivation behavior of the HRB400 reinforcing steel under SPS. It is found that the rapid growth of passive films occurs primarily within the initial 2–3 days after immersion in the SPS, while the compaction of passive films takes place mainly at the later stages. The open circuit potential and charge transfer resistance of the passive films initially increase and then decrease with the continuous rise in the US content. The Fe2O3 constitutes a significant portion of the passive films above the steels treated with the SPS irrespective of US dosages, whereas the content of FeO is highly influenced by US dosages. The UG-US-C pore solution could enhance the passivation behavior because of lower Ca2+ and higher Na+. In case of UG/US ratio at 2:3, the passive film exhibits the greatest thickness at 7.5 nm and meanwhile with the highest compaction and the least roughness. © 2024 Elsevier Ltd
Keyword :
Blast furnaces Blast furnaces Compaction Compaction Passivation Passivation Slag cement Slag cement
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GB/T 7714 | Yang, Zhengxian , Zheng, Mingye , Xiong, Xiaoli et al. Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag [J]. | Journal of Building Engineering , 2024 , 97 . |
MLA | Yang, Zhengxian et al. "Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag" . | Journal of Building Engineering 97 (2024) . |
APA | Yang, Zhengxian , Zheng, Mingye , Xiong, Xiaoli , Zhang, Yong , Briseghella, Bruno , Marano, Giuseppe Carlo . Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag . | Journal of Building Engineering , 2024 , 97 . |
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The weak long-term photocatalytic performance of photocatalytic cementitious materials under real-life service conditions has always been one of the main factors restricting their large-scale application. A novel stable three-dimensional structure of S-g-C3N4/MgAl-LDH was constructed by composing S-g-C3N4 with MgAl-LDH, aiming to improve its compatibility with cement mortar to achieve ideal long-term photocatalytic performance under natural exposure. Taking S-g-C3N4 as reference, the possible contributions of MgAl-LDH on improving the mechanical strength and long-term photocatalytic performance of mortar was analyzed by XRD, TG/DTG, SEM-EDX and isothermal calorimetry. The result shows that since the high specific surface area and refinement of MgAl-LDH, the dense surface morphology and fewer surface defects jointly promote the improvement of strength. When the content of S-g-C3N4/MgAl-LDH is 6 %, the 28d compressive strength of composite mortar is excellent, which is 28.7 % higher than the pure cement mortar. More importantly, under the stimulation of the calcium-rich layer on the surface of S-g-C3N4/MgAl-LDH, the accumulation of a large amount of gelling hydration products is beneficial to the stable long-term photocatalytic performance of S-g-C3N4/MgAl-LDH doped mortar. After 180 days of natural exposure, the NOx removal rate of the CMSL-8 % sample can still remain at 68.3 % of the original value (328 μmol·m−2·h−1). This research provides a new theoretical basis for photocatalytic cementitious materials to achieve ideal long-term photocatalytic performance. © 2024 Elsevier Ltd
Keyword :
Aluminum alloys Aluminum alloys Aluminum compounds Aluminum compounds Binary alloys Binary alloys Cements Cements Compressive strength Compressive strength Hydration Hydration Magnesium alloys Magnesium alloys Magnesium compounds Magnesium compounds Morphology Morphology Mortar Mortar Surface defects Surface defects Surface morphology Surface morphology
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GB/T 7714 | Xu, Jiankun , Yang, Zhengxian , Lu, Lin et al. New S-g-C3N4 based photocatalytic mortar with long-term photocatalytic performance by constructing three-dimensional structure Mg-Al layered double hydroxides [J]. | Construction and Building Materials , 2024 , 438 . |
MLA | Xu, Jiankun et al. "New S-g-C3N4 based photocatalytic mortar with long-term photocatalytic performance by constructing three-dimensional structure Mg-Al layered double hydroxides" . | Construction and Building Materials 438 (2024) . |
APA | Xu, Jiankun , Yang, Zhengxian , Lu, Lin , Wang, Wencheng , Briseghella, Bruno , Marano, Giuseppe Carlo . New S-g-C3N4 based photocatalytic mortar with long-term photocatalytic performance by constructing three-dimensional structure Mg-Al layered double hydroxides . | Construction and Building Materials , 2024 , 438 . |
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The effectiveness of the use of fibers in Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) can be limited by their random orientation in the cementitious matrix. Oriented steel fibers, on the other hand, show significant promise in enhancing the tensile and flexural properties of UHPFRC specimens when the principal tensile stresses predominantly align in a single direction. Despite various proposed methods for orienting steel fibers in UHPFRC, their comparative impact on mechanical properties remained unclear. To bridge this gap, three different strategies were examined in this study, namely: i) chute with vibration table, ii) L-shaped device, and iii) electromagnetic field with vibration table, aiming at controlling the steel fibers orientation in UHPFRC specimens. Uniaxial tensile, four-point flexural, and compressive tests were conducted to examine the influence of different orientation methods on mechanical properties. The experimental findings revealed that compared to randomly oriented fibers, oriented steel fiber UHPFRC had superior tensile, flexural, and compressive strength. Additionally, fiber orientation led to improved consistency of the UHPFRC properties as well as thinner, more densely distributed cracks, regular fracture surfaces, and lower elastic modulus and Poisson's ratio. Electromagnetic field orientation proved to be the most effective orientation method, L-shaped device method the least effective due to heightened fluidity demands in the mixture, and the chute with vibration method ranked in between. This research represents a thorough investigation into the comparative efficacy of different methods for orienting steel fibers in UHPFRC, shedding new light on the optimal approach to enhance mechanical properties. © 2024 Elsevier Ltd
Keyword :
Four-point flexural test Four-point flexural test Mechanical property Mechanical property Orientation Orientation Steel fiber Steel fiber Ultra-high performance fiber reinforced concrete Ultra-high performance fiber reinforced concrete Uniaxial tensile test Uniaxial tensile test
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GB/T 7714 | Xue, J. , Mao, S. , Cacciola, P. et al. Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC [J]. | Construction and Building Materials , 2024 , 448 . |
MLA | Xue, J. et al. "Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC" . | Construction and Building Materials 448 (2024) . |
APA | Xue, J. , Mao, S. , Cacciola, P. , Contento, A. , Lampropoulos, A. , Nicolaides, D. et al. Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC . | Construction and Building Materials , 2024 , 448 . |
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This paper presents a comprehensive investigation on the positive potential of steel slag (SS) to mitigate the autogenous shrinkage of alkali-activated slag (AAS) while maintaining a reasonably high strength. Changes of the physicochemical properties of AAS with the addition of SS were examined in terms of hydration heat, autogenous shrinkage, chemical shrinkage, internal relative humidity (RH) and mechanical behaviors. The microstructure of AAS-SS systems was characterized using X-ray diffraction, thermogravimetric analysis and nitrogen adsorption techniques. The shrinkage mechanism and quantification approach of the AAS-SS systems were discussed, in addition to a sustainability assessment. The results indicate that the 7-day autogenous shrinkage of AAS paste was decreased by 16 %, 35 % and 42 % when SS was incorporated by 15 %, 30 % and 45 % respectively, owing to the obviously slower hydration and higher internal RH at the early age. Meanwhile, the inclusion of SS substantially mitigates the chemical shrinkage and reduces the pores below 50 nm, thereby significantly decreasing the capillary pressure associated with smaller water-filled pore sizes. Substitutions of blast furnace slag by up to 45 % SS enable to reduce CO2 emissions by 18.4 kg/m3 and decrease autogenous shrinkage by 42 % without obvious compromise in the loss of elastic modulus and compressive strength. © 2024 Elsevier Ltd
Keyword :
Atomic absorption spectrometry Atomic absorption spectrometry Blast furnaces Blast furnaces Compressive strength Compressive strength Gas adsorption Gas adsorption Hydration Hydration Physicochemical properties Physicochemical properties Pore size Pore size Shrinkage Shrinkage Slags Slags Sustainable development Sustainable development Thermogravimetric analysis Thermogravimetric analysis
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GB/T 7714 | Li, Kang , Yang, Zhengxian , Nicolaides, Demetris et al. Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag [J]. | Construction and Building Materials , 2024 , 438 . |
MLA | Li, Kang et al. "Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag" . | Construction and Building Materials 438 (2024) . |
APA | Li, Kang , Yang, Zhengxian , Nicolaides, Demetris , Liang, Minfei , Briseghella, Bruno , Marano, Giuseppe Carlo et al. Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag . | Construction and Building Materials , 2024 , 438 . |
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NOx is a harmful gas that causes respiratory diseases and acid rain. Commonly used photocatalysts for degrading NOx such as UV responsive TiO2 show weak photocatalytic degradation efficiency under visible light. Furthermore, the great concern is that the degradation product, nitrates (NO3-), from NOx could be washed away and increase the nitrogen deposition and eutrophication in the surrounding soil and aquatic environments, resulting in serious secondary pollution. To address these issues, this study proposes a novel solution by incorporating S-g-C3N4/MgAl-CLDH nanocomposites into a cementitious system which features high NOx degradation efficiency under visible light condition and the efficient capture and adsorption of NO3- in situ. The NOx degradation was comprehensively studied, encompassing the influencing factors and stability. The mechanism for NO3- adsorption process was expounded using the isothermal model. The results show that the amount of exposed S-g-C3N4/MgAl-CLDH and the contact area between S-g-C3N4/MgAl-CLDH and NOx are the essential reasons affecting the NOx degradation. The NOx degradation ability of photocatalytic mortar exhibits excellent stability with the NOx removal ratio decreasing by only 4.8 % and 14.5 % after ten consecutive tests and 120 min of ultrasonic washing, respectively. Furthermore, S-g-C3N4/MgAl-CLDH increases the NO3- adsorption capacity of photocatalytic mortar by about 1.5 times, and the adsorption process of NO3- follows the Freundlich isotherm. The study offers an alternate method for designing innovative nanocomposites in cement-based materials to control environmental pollution. © 2024 Elsevier Ltd
Keyword :
Acid rain Acid rain Eutrophication Eutrophication Gas adsorption Gas adsorption Nitrogen removal Nitrogen removal Photocatalytic activity Photocatalytic activity Photodegradation Photodegradation Soil cement Soil cement Soil pollution Soil pollution Soil pollution control Soil pollution control Ultrasonic cleaning Ultrasonic cleaning Ultrasonic testing Ultrasonic testing
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GB/T 7714 | Lu, Lin , Yang, Zhengxian , Li, Bo et al. Photocatalytic NOx degradation and NO3- adsorption by mortar modified with S-g-C3N4/MgAl-CLDH: Influence factors and stability [J]. | Journal of Environmental Chemical Engineering , 2024 , 12 (6) . |
MLA | Lu, Lin et al. "Photocatalytic NOx degradation and NO3- adsorption by mortar modified with S-g-C3N4/MgAl-CLDH: Influence factors and stability" . | Journal of Environmental Chemical Engineering 12 . 6 (2024) . |
APA | Lu, Lin , Yang, Zhengxian , Li, Bo , Ye, Dejun , Luo, Shengyang , Marano, Giuseppe Carlo . Photocatalytic NOx degradation and NO3- adsorption by mortar modified with S-g-C3N4/MgAl-CLDH: Influence factors and stability . | Journal of Environmental Chemical Engineering , 2024 , 12 (6) . |
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The nano-engineered cementitious composites (NCC) were prepared using g-C3N4/CoAl-LDH nanoflower (nano-CN/L), in combination with mineral admixtures including fly ash (FA), metakaolin (MK), and ground granulated blast furnace slag (GGBFS). The synergistic effects and mechanisms of nano-CN/L and mineral admixtures on the mechanical, chloride penetration resistance and air purification properties of NCC were investigated. The results show that nano-CN/L promotes the early hydration of cementitious materials and improves the composition and morphology of C-S-H gel. Furthermore, the filling effect of nano-CN/L significantly optimizes the pore structure and interfacial crack width of NCC, thereby eliminating the adverse impact of FA, MK, and GGBFS on its early mechanical strengths. Additionally, nano-CN/L enhances the chloride penetration resistance and NOx removal properties of NCC through its strong ion adsorption and photocatalytic activity, respectively. Incorporating 0.9 % nano-CN/L by mass of cementitious materials reduces the chloride diffusion coefficient of NCC at curing age of 56d by 26.9 % and increases the NOx removal ratio by 11 times. The 7d's compressive and flexural strengths of NCC increase by 13.6 % and 4.6 %, respectively, compared to the one without nano-CN/L. As a novel multifunctional nanomaterial, nano-CN/L not only provides a new pathway for extending the service life of cementitious composites, but also injects new momentum into their environmental-friendly development. © 2024 Elsevier Ltd
Keyword :
Air cleaners Air cleaners Blast furnaces Blast furnaces Chlorination Chlorination Compressive strength Compressive strength Nanoclay Nanoclay Nanoflowers Nanoflowers
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GB/T 7714 | Lu, Lin , Yang, Zhengxian , Ning, Pingping et al. Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites [J]. | Construction and Building Materials , 2024 , 450 . |
MLA | Lu, Lin et al. "Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites" . | Construction and Building Materials 450 (2024) . |
APA | Lu, Lin , Yang, Zhengxian , Ning, Pingping , Marano, Giuseppe Carlo , Zhang, Yong . Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites . | Construction and Building Materials , 2024 , 450 . |
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