Materialwissenschaft und Werkstofftechnik最新文献_第3页

Advancement of tribological properties of AA 5083 aluminum matrix composite through the incorporation of micro- and nano-copper ferrite reinforcements synthesized from mulberry leaves (Morus alba L.) using a green synthesis method Verbesserung der tribologischen Eigenschaften von Aluminium-Matrix-Verbundwerkstoffen AA 5083 durch die Einarbeitung von mit einer grünen Synthesemethode synthetisierten Mikro- und Nano-Kupferferrit-Verstärkungen aus Maulbeerblättern (Morus alba L.) 采用绿色合成方法，掺入从桑叶（Morus alba L.）中合成的微纳米铜铁氧体增强材料，提高 AA 5083 铝基复合材料的摩擦学性能采用绿色合成方法，掺入从桑叶（Morus alba L.）中合成的微纳米铜铁氧体增强材料，提高 AA 5083 铝基复合材料的摩擦学性能

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400108

A. Işıtan, M. Sulak, F. Özen, V. Onar

{"title":"Advancement of tribological properties of AA 5083 aluminum matrix composite through the incorporation of micro- and nano-copper ferrite reinforcements synthesized from mulberry leaves (Morus alba L.) using a green synthesis method\u0000 Verbesserung der tribologischen Eigenschaften von Aluminium-Matrix-Verbundwerkstoffen AA 5083 durch die Einarbeitung von mit einer grünen Synthesemethode synthetisierten Mikro- und Nano-Kupferferrit-Verstärkungen aus Maulbeerblättern (Morus alba L.)","authors":"A. Işıtan, M. Sulak, F. Özen, V. Onar","doi":"10.1002/mawe.202400108","DOIUrl":"https://doi.org/10.1002/mawe.202400108","url":null,"abstract":"This study investigates the enhancement of wear and friction performance in an AA 5083 matrix composite by incorporating copper ferrite (CuFe2O4) micro and nanoparticles, synthesized through a green process using mulberry (Morus alba L.) leaf extract for the first time. Two distinct composites are fabricated using the liquid metallurgy vortex-route method featuring an aluminum AA 5083 matrix and 0.2 % micro- and nano- copper ferrite reinforcement by weight. AA 5083 cast alloy under identical conditions. Characterization analyses were conducted to elucidate the composite properties. The composite samples are underwent wear tests against a steel disc under three different loads (10 N, 20 N, and 40 N) at two sliding distances (250 m and 500 m), maintaining a constant sliding speed of 2.6 m/s using a pin-on-disc wear test apparatus. The composites exhibited superior wear and friction performance compared to the unreinforced material. Overall, the nano-copper ferrite reinforced material showcased, on average, 33 % and 52 % lower wear rates than the unreinforced material, and 27 % and 31 % lower wear rates than the micro-copper ferrite reinforced material respectively.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"212-225"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Friction stir welding of high iron-containing cast aluminum-silicon-magnesium alloys. Rührreibschweißen von hoch eisenhaltigen Aluminium-Silizium-Magnesium-Gusslegierungen

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202200197

C. Phongphisutthinan, W. Rattanathaworn, K. Waree, T. Suga, H. Liu, Y. Morisada, H. Fujii

引用次数: 0

Influences of composite additives and technological parameters on the microstructure and properties of electrolytic copper foil Einfluss von Verbundwerkstoffzusätzen und technologischen Parametern auf das Gefüge und die Eigenschaften von elektrolytischer Kupferfolie

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400186

B. Zhang, W. C. Sun, E. Y. Liu, Y. F. Xu, M. R. Zhou, H. Cai, J. L. Zhang, T. Z. Jia

{"title":"Influences of composite additives and technological parameters on the microstructure and properties of electrolytic copper foil\u0000 Einfluss von Verbundwerkstoffzusätzen und technologischen Parametern auf das Gefüge und die Eigenschaften von elektrolytischer Kupferfolie","authors":"B. Zhang, W. C. Sun, E. Y. Liu, Y. F. Xu, M. R. Zhou, H. Cai, J. L. Zhang, T. Z. Jia","doi":"10.1002/mawe.202400186","DOIUrl":"https://doi.org/10.1002/mawe.202400186","url":null,"abstract":"In this paper, the additives consisting of bis-(3-sulfopropyl)-disulfide, hydroxyethylcellulose and collagen additive compounding are used to fabricate ultra-thin copper foils with low roughness on titanium substrates. The results show that the deposited layers obtained at the electrodeposition time of 3 min, the electrolyte temperature of 50 °C and the output voltage of 2.5 V exhibit small grain size and good adhesion to the substrate. Meanwhile, the effects of the two-component additive and the three-component additive on the microstructures, surface roughness and electrochemical behavior of copper foils are studied. The x-ray diffraction results reveal that copper foils prepared by simultaneous introduction of 0.06 g/L bis-(3-sulfopropyl)-disulfide and 0.08 g/L collagen possess a dense and homogeneous structure with the smallest grain size and the lowest roughness, which is diminished by 26.17 %. The electrochemical results indicated that the SC additive had an inhibitory effect on the deposition of copper ions, while the SH additive exerted depolarizing effect in this electrolyte system, accelerating the deposition of copper particles, which was attributed to the antagonistic interaction between bis-(3-sulfopropyl)-disulfide and hydroxyethylcellulose that hindered the preferential adsorption of the additive at the surface protrusions, resulting in the decrease in the refinement effect of the bis-(3-sulfopropyl)-disulfide additive. Under the optimized process parameters, the increase in the deposition rate of Cu2+ balances the relationship between nucleation and growth of copper ions, which ultimately produces the copper foil with smooth surface and low roughness.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"235-250"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of FeSiAl/SrFe12O19 soft magnetic composite materials with low magnetic loss Synthese von weichmagnetischen FeSiAl/SrFe12O19-Verbundwerkstoffen mit geringem magnetischen Verlust

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400174

L. Su, P. Wang, C. Y. Yu, L. P. Tao, S. Z. Shu

{"title":"Synthesis of FeSiAl/SrFe12O19 soft magnetic composite materials with low magnetic loss\u0000 Synthese von weichmagnetischen FeSiAl/SrFe12O19-Verbundwerkstoffen mit geringem magnetischen Verlust","authors":"L. Su, P. Wang, C. Y. Yu, L. P. Tao, S. Z. Shu","doi":"10.1002/mawe.202400174","DOIUrl":"https://doi.org/10.1002/mawe.202400174","url":null,"abstract":"FeSiAl/SrFe12O19 soft magnetic composite material was prepared by mechanically crushing FeSiAl powder and M-type permanent magnet hexagonal ferrite powder according to a certain quality. Their structures, morphologies, and magnetic properties were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), SQUID, and B−H analyzers. Compared to organic and other inorganic composite materials, SrFe12O19 has a higher thermal decomposition temperature. The x-ray diffraction pattern indicates that SrFe12O19 phase was detected in the sample. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) images show that powdered SrFe12O19 is dispersed on the surfaces and gaps of particles of different sizes. The magnetic analysis results indicate that although SrFe12O19 increases the hysteresis loss of the material, its good insulation reduces eddy current loss. When the content of SrFe12O19 is 2 wt.-%, the magnetic loss is the lowest. The lower magnetic loss and higher thermal decomposition temperature of this composite material make it have a wider range of application prospects.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"251-255"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of micro-sized blast furnace slag on physical, mechanical, and thermo-mechanical properties of bi-directional date palm fiber reinforced polymer composite Einfluss von Hochofenschlacke in Mikrogröße auf die physikalischen, mechanischen und thermomechanischen Eigenschaften von bidirektionalen, mit Dattelpalmenfasern verstärkten Polymerverbundwerkstoffen

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400153

M. Pradhan, A. Patnaik, M. K. Banerjee, S. Mishra

{"title":"Effect of micro-sized blast furnace slag on physical, mechanical, and thermo-mechanical properties of bi-directional date palm fiber reinforced polymer composite\u0000 Einfluss von Hochofenschlacke in Mikrogröße auf die physikalischen, mechanischen und thermomechanischen Eigenschaften von bidirektionalen, mit Dattelpalmenfasern verstärkten Polymerverbundwerkstoffen","authors":"M. Pradhan, A. Patnaik, M. K. Banerjee, S. Mishra","doi":"10.1002/mawe.202400153","DOIUrl":"https://doi.org/10.1002/mawe.202400153","url":null,"abstract":"This present research work focuses on studying the physical, mechanical, and thermo-mechanical behavior of blast furnace slag (BFS) in bi-directional date palm fiber reinforced hybrid polymer composites. During this investigation, the different weight percentage of blast furnace slag filler (from 3 wt.-% to 7 wt.-%) was added to date palm fiber to fabricate epoxy-based composite by vacuum assisted resign transfer molding (VARTM) technique under controlled pressure conditions. The fabricated composite were characterized for physical (density, void content, hardness), mechanical testing (tensile, flexural, inter-laminar shear strength, impact strength and fracture toughness) and thermal properties. The experimental result indicated varied rate of deterioration for tensile strength of the composites and the maximum tensile strength 69.51 MPa was obtained for blast furnace slag (3 wt.-%) and date palm fiber (30 wt.-%) hybrid composite. The optimum flexural and inter laminar shear strength has been obtained to be 85.72 MPa and 9.43 MPa for 7 wt.-% blast furnace slag-filled date palm fiber-epoxy hybrid composite. Similarly, in case of fracture toughness, blast furnace slag-filled composites, fracture toughness increases by approximately 20 %, 28 %, and 38 % respectively over unfilled composites. Based upon the results of the present research work can be afterward prolonged for automobile components and low-grade structural application in addition to optimal waste utilization to reduce environmental degradation.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"266-280"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimentelle und rechnerisch validierte Methode zur Bestimmung der Mindesteinschraubtiefe von Schraubenverbindungen mit gefurchtem Mutterngewinde Experimental and computationally validated approach for determining the minimum length of thread engagement for bolted joints with formed female threads

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202100376

F. Kraemer, T. Binder, M. Klein, M. Oechsner

引用次数: 0

Hardness enhancement of commercially pure aluminium by a typical cyclic heat treatment process involving repeated ice-brine quenching Erhöhung der Härte von Reinaluminium durch ein typisches zyklisches Wärmebehandlungsverfahren mit wiederholtem Abschrecken in Eis-Sole

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400181

J. Maity, A. S. Bansfore, A. Pal, B. Hazra, L. Roy, D. Mahato, A. B. Shav

{"title":"Hardness enhancement of commercially pure aluminium by a typical cyclic heat treatment process involving repeated ice-brine quenching\u0000 Erhöhung der Härte von Reinaluminium durch ein typisches zyklisches Wärmebehandlungsverfahren mit wiederholtem Abschrecken in Eis-Sole","authors":"J. Maity, A. S. Bansfore, A. Pal, B. Hazra, L. Roy, D. Mahato, A. B. Shav","doi":"10.1002/mawe.202400181","DOIUrl":"https://doi.org/10.1002/mawe.202400181","url":null,"abstract":"A typical cyclic heat treatment process has been adopted up to four cycles on initially annealed commercially pure aluminium, primarily containing iron impurity, that involves short-duration (5 minutes) holding at 600 °C followed by ice-brine quenching in each cycle. As a consequence, a significant grain refinement effect and a gradual accumulation of lattice strain during the progress of cyclic heat treatment are observed in relation to an evolution of the regions of extremely low misorientation angle in the aluminium matrix. Apart from quench-in strain, the presence of grain boundary iron aluminide phase, possessing a different coefficient of thermal expansion than that of aluminium matrix, appears to be an additional reason for gradual lattice strain development. In addition, a preferred growth of (202) plane along [101] direction towards the final stage of cyclic heat treatment (four cycles) is also revealed. As a result of gradual lattice strain accumulation and grain refinement effects, the hardness of commercially pure aluminium is found to be considerably enhanced (98 HV 10) after 4 cycles of heat treatment as compared to an initial hardness (36 HV 10) in annealed condition.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"201-211"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of mechanical properties for Ricinus communis L plant fiber/epoxy composite Bewertung der mechanischen Eigenschaften von Ricinus communis L Pflanzenfasern/Epoxid-Verbundwerkstoff 评估蓖麻植物纤维/环氧树脂复合材料的机械性能评估蓖麻植物纤维/环氧树脂复合材料的机械性能

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-02-05 DOI: 10.1002/mawe.202400064

R. Egala, K. Dewangan, S. G. Setti

{"title":"Evaluation of mechanical properties for Ricinus communis L plant fiber/epoxy composite\u0000 Bewertung der mechanischen Eigenschaften von Ricinus communis L Pflanzenfasern/Epoxid-Verbundwerkstoff","authors":"R. Egala, K. Dewangan, S. G. Setti","doi":"10.1002/mawe.202400064","DOIUrl":"https://doi.org/10.1002/mawe.202400064","url":null,"abstract":"This research explores the mechanical properties of castor oil plant (Ricinus communis L) natural fiber-reinforced epoxy composites, addressing the need for sustainable materials. Cortex and xylem fibers extracted from castor oil plant residue using a standardized method were used to fabricate unidirectional long fiber and short random fiber composites. Various fiber volume fractions (10 %, 20 %, 30 %, 40 %) and fiber lengths (5 mm to 40 mm) of cortex fibers were tested according to ASTM standards and results showed that fibers of diameters 275 μm to 325 μm, have superior tensile strength (290 MPa to 346 MPa) compared to xylem fibers (90 MPa to 140 MPa). Composites of 40 % volume fraction cortex fibers aligned longitudinally exhibited the highest tensile (76.35 MPa), flexural (121.45 MPa), and impact strength (6.99 kJ/m2) significantly improved compared to the epoxy matrix. For short random cortex fiber composites, the optimal mechanical performance was achieved with 20 mm fibers and a 40 % volume fraction, resulting in the highest tensile strength (32.12 MPa), flexural strength (84.31 MPa), and impact energy (40 J/m). These results highlight the potential of castor oil cortex fibers to enhance the mechanical properties of epoxy composites for various engineering applications.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"290-304"},"PeriodicalIF":1.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementation of Taguchi design for dry sliding wear of high density polyethylene/silicon carbide composite Anwendung des Taguchi-Designs für den Trockengleitverschleiß von Polyethylen/Siliziumkarbid-Verbundwerkstoffen hoher Dichte

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-01-28 DOI: 10.1002/mawe.202400128

T. Bera, S. Mohanty

{"title":"Implementation of Taguchi design for dry sliding wear of high density polyethylene/silicon carbide composite\u0000 Anwendung des Taguchi-Designs für den Trockengleitverschleiß von Polyethylen/Siliziumkarbid-Verbundwerkstoffen hoher Dichte","authors":"T. Bera, S. Mohanty","doi":"10.1002/mawe.202400128","DOIUrl":"https://doi.org/10.1002/mawe.202400128","url":null,"abstract":"The present work focus on the optimization of dry sliding wear behavior operating parameters of high density polyethylene/silicon carbide composites carried out with Taguchi method. The various control factors such as filler content, applied load and sliding velocity were selected at three different levels of each. The specific wear rate and coefficient of friction were selected as performance output. The dry sliding wear studies revealed that the coefficient of friction increases with an increase in applied load and sliding velocity. The specific wear rate for all composites increased with an increase in applied force. Nine experimental runs were performed using Taguchi L9 orthogonal array. The optimum control factors were predicted according to the MINITAB16 software. Analysis of variance has been applied to predict the highly significant operating parameter. The analysis of variance analysis revealed that the applied load is the most important control factor out of all the other control factors, followed by filler content and sliding velocity, of dry sliding wear behavior of high density polyethylene/silicon carbide composites.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"226-234"},"PeriodicalIF":1.2,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of machining parameters on the machinability of 15-5 precipitation hardened stainless steel during dry turning Einfluss der Bearbeitungsparameter auf die Bearbeitbarkeit von ausscheidungsgehärtetem Edelstahl 15-5 beim Trockendrehen

IF 1.2 4区材料科学

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-01-28 DOI: 10.1002/mawe.202400180

D. P. Selvaraj, D. S. E. J. Dhas, P. George

{"title":"Effect of machining parameters on the machinability of 15-5 precipitation hardened stainless steel during dry turning\u0000 Einfluss der Bearbeitungsparameter auf die Bearbeitbarkeit von ausscheidungsgehärtetem Edelstahl 15-5 beim Trockendrehen","authors":"D. P. Selvaraj, D. S. E. J. Dhas, P. George","doi":"10.1002/mawe.202400180","DOIUrl":"https://doi.org/10.1002/mawe.202400180","url":null,"abstract":"This research presents the studies on the effect of machining variables and the empirical modeling of machinability output responses during dry turning of 15–5 precipitation-hardened stainless steel (PHSS) using the taguchi meta-heuristic algorithm. L9 orthogonal array (OA) robust experimental design was selected for conducting the dry turning operations. The input variables included cutting velocity, depth of cut, and feed rate, while the output responses measured were surface roughness (Ra) and cutting force (Fc). The influence of these process variables was determined through analysis of variance (ANOVA). ANOVA results revealed that cutting speed, feed rate and depth of cut were impacting the average surface roughness by 36 %, 29 %, and 31 %, respectively and influencing the cutting force by 2 %, 16 %, and 72 %, respectively, during turning operation. Empirical models for predicting cutting force and surface roughness were developed using the Taguchi meta-heuristic algorithm. The optimization process resulted in a significant reduction in surface roughness, with Ra decreasing by 17 % and a notable decrease in cutting force, Fc, by 8 %. These numerical improvements indicate that the proposed optimization approach substantially enhances machining performance, validating its effectiveness.","PeriodicalId":18366,"journal":{"name":"Materialwissenschaft und Werkstofftechnik","volume":"56 2","pages":"281-289"},"PeriodicalIF":1.2,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0