Material Design & Processing Communications最新文献

{"title":"Effects of Polylactic Acid Content, Reprocessing Cycles, and Aging Conditions on the Mechanical Properties of Recycled High-Density Polyethylene","authors":"Javier Cruz-Salgado,&nbsp;Anayansi Estrada-Monje,&nbsp;Miroslava Alejandra Silva-Goujon,&nbsp;Sergio Alonso-Romero,&nbsp;Erasto Armando Zaragoza-Contreras","doi":"10.1155/mdp2/7787946","DOIUrl":"https://doi.org/10.1155/mdp2/7787946","url":null,"abstract":"<p>The increasing incorporation of biodegradable plastics into conventional recycling streams has raised concerns regarding their influence on the performance of recycled polymers. In particular, the presence of polylactic acid (PLA) in recycled high-density polyethylene (rHDPE) may significantly affect mechanical stability during reprocessing and environmental exposure. This study systematically evaluates the combined effects of PLA content (0–50 wt%), recycling cycles, exposure time, and aging conditions (natural and accelerated) on the mechanical performance of rHDPE/PLA blends using a multilevel full factorial experimental design comprising 96 experimental runs. Tensile stress, elongation at break, and impact resistance were measured according to ASTM standards. Statistical analyses including ANOVA, regression modeling, and interaction analysis were applied to identify significant factors and combined effects, followed by multiresponse optimization using a desirability-function approach. PLA incorporation produced a drastic reduction in ductility and toughness, with elongation at break decreasing by more than 95% and impact resistance by approximately 80%–85% as PLA content increased from 0 to 50 wt%. Accelerated aging generated the most pronounced reduction in tensile strength, with decreases on the order of 20%–30% compared with natural aging conditions. Recycling cycles further contributed to mechanical degradation, although to a lesser extent. Significant interaction effects among composition, recycling cycle, and aging environment demonstrated that mechanical degradation results from synergistic thermo-oxidative, processing-induced, and interfacial incompatibility mechanisms. The results provide a comprehensive statistical framework for understanding the degradation behavior of rHDPE systems contaminated with biodegradable polymers and support the identification of optimal operating conditions for maximizing the mechanical performance of recycled polymer blends.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2026 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/7787946","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148095981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Geometry and Size on Precision and Accuracy in Fused Deposition Modeling (FDM) Additive Manufacturing","authors":"Nikodmose Moges Gebre,&nbsp;Ilaria Cristofolini,&nbsp;Marco Zago,&nbsp;Pasquale Gallo","doi":"10.1155/mdp2/7177386","DOIUrl":"https://doi.org/10.1155/mdp2/7177386","url":null,"abstract":"<p>This study presents a systematic evaluation of the dimensional accuracy and process capability of fused deposition modeling (FDM) additive manufacturing, with emphasis on the influence of process-induced thermal and kinematic effects on dimensional performance. Two geometries made of polylactic acid (PLA) were considered: a staircase specimen to assess process capability and directional effects, and a geometric benchmark test artifact (GBTA) to evaluate dimensional reliability across representative features. Measurements were performed using a digital caliper for the staircase model and a coordinate measuring machine (CMM) for the GBTA. Under manufacturer-recommended, unoptimized printing conditions, staircase analysis showed that the investigated FDM system achieved process performance indices (<i>P</i>_<i>m</i> and <i>P</i>_{<i>m</i><i>k</i>}) ≥ 1.33 at a 95% confidence level. Dimensional stability varied across the build chamber due to spatially nonuniform cooling conditions, with statistically significant position-dependent deviations observed particularly along the build direction. Larger features exhibited higher relative precision. Achievable ISO 286-1 International Tolerance grades ranged from IT9 to IT14. GBTA results confirmed systematic undersizing of cylindrical and curved features. Absolute dimensional deviations remained approximately constant across nominal sizes, whereas percentage errors increased for smaller features due to scale effects. Despite these variations, the geometric form was preserved, demonstrating high repeatability. The proposed capability-based evaluation framework provides a structured approach to quantifying dimensional reliability in polymer-based material extrusion processes for functional components.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2026 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/7177386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148094774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porosity Evolution and Crack Formation in NiTi Under Varying Laser Powder Bed Fusion Parameters","authors":"Tebogo Ledwaba,&nbsp;Bartlomiej Wysocki,&nbsp;Agnieszka Chmielewska-Wysocka,&nbsp;Christine Steenkamp,&nbsp;Anton du Plessis","doi":"10.1155/mdp2/5678273","DOIUrl":"10.1155/mdp2/5678273","url":null,"abstract":"<p>The imaging and quantitative analysis of defects such as porosity and cracks are crucial steps in optimizing the fabrication parameters of powder bed fusion using laser beam (PBF-LB) for a particular material type. For this purpose, most studies resort to optical microscopes, which allow analysis of 2-dimensional surface cross sections. X-ray computed tomography (XCT) is an alternative method with added benefits such as 3-dimensional information and multi–cross-sectional data. However, XCT imaging of pores and cracks has not yet been explored in detail particularly during parameter optimization of the PBF-LB process of NiTi alloy. XCT images require segmentation in order to quantify different features in 3D, but this is often complex due to limited resolution and image artifacts. Here, we develop and employ a four-class segmentation model based on a 2.5D U-Net to classify and extract cracking and pore defects. This reveals the true 3D nature of the defects and distinguishes cracks from pores accurately, allowing their quantification. Quantitative analysis is carried out to investigate the effects of rescanning of in situ alloyed NiTi and varying energy densities on the extent of the produced defects for a series of 52 NiTi samples fabricated in the PBF-LB process. Moreover, the obtained XCT cross sections and corresponding segmentations highlight the effect of rotation of scan vectors between layers and no-rotation scanning strategies, providing an inside view of the cracks, pores, lack of fusions and balling effect. The findings revealed that samples fabricated using 45° rotations of scan vectors are susceptible to balling and delaminations, whereas samples with no rotations of scan vectors show high levels of cracking. Additionally, compositional analysis with SEM and EDS is used to surmise how a considerable amount (99.42%) of discovered cracks are located at the contours with mean penetration length of 0.18 mm for no rotation and 0.11 mm for rotation of scan vectors.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2026 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/5678273","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of Multi-Cell FDM Build Bed Systems for Optimal Material Usage in Additive Manufacturing Process","authors":"Addisu Workiye,&nbsp;Yonas Tsega","doi":"10.1155/mdp2/7334170","DOIUrl":"https://doi.org/10.1155/mdp2/7334170","url":null,"abstract":"<p>Support structures are essential in additive manufacturing (AM) processes such as material extrusion, particularly for fabricating parts with overhanging features. However, conventional supports are typically removed after printing and cannot be reused, resulting in significant material waste and increased printing time. To address these limitations, this research introduces a novel multi-cell FDM build bed support system designed to minimize support-related challenges in fused deposition modeling (FDM). The proposed system employs an array of movable pins that function as a dynamically adjustable build platform controlled by an Arduino-based program. During the printing process, the pins elevate layer by layer, corresponding to the layer thickness. Each pin automatically stops at a predetermined height through an electromechanical control system. The lifting mechanism operates via a programmable stepper motor, whereas magnetic coupling between permanent magnets and metallic washers ensures stable support and protects the printed component from damage during detachment. Additionally, a hybrid support approach has been developed for printing curved geometries. This method combines traditional printed supports with the multi-cell FDM bed system, allowing the adjustable platform to provide sufficient support and significantly reduce the need for printed material. For highly complex overhangs beyond the bed′s adjustable range, conventional supports are selectively employed. Experimental results demonstrate that the proposed multi-cell FDM build bed system achieves up to 16.22% reduction in material consumption and 22.19% reduction in printing time compared with tree support and conventional FDM printing methods.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2026 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/7334170","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Joining Optimization, Temperature, and IMC Evaluation for AL to Steel Friction Stir Spot Welding","authors":"Mohanad Kadhim Mejbel,&nbsp;Isam Tareq Abdullah,&nbsp;Bassim Mohammed Abd","doi":"10.1155/mdp2/5713884","DOIUrl":"https://doi.org/10.1155/mdp2/5713884","url":null,"abstract":"<p>Friction stir spot welding (FSSW) effectively solves many problematic welding metals, such as dissimilar metals and thin alloy sheets. Carbon steel-AISI 1006 top sheet and an aluminum alloy AA2024-T3 bottom sheet were joined by FSSW with a cylindrical pinless tool. Joints are evaluated in terms of temperature, mechanical characteristics, microstructure, and macrostructure. With the other variables of the welding operation being constant, the influence of spindle speed, dwell duration, and penetration depth on the force of tensile shear failure has been studied throughout the welding process. The welding parameters were 10 and 15-s preheating time, 0.2, 0.4, and 0.6 mm plunging depth. Rotational speed was 710, 900, 1400, and 1800 rpm. A shear tensile test was utilized to examine the bonded specimens. At the optimal conditions, a microstructural analysis was conducted. Both interfacial and pullout fractures were found in the AA2024-T3 and carbon steel sheets. Intermetallic compounds (IMCs) located at the weld interface were evaluated.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/5713884","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145909299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphological and Mechanical Analysis of Epoxy–Chicken Feather Fiber Composites With COMSOL-Assisted Simulation","authors":"Zeina Talib Kareem,&nbsp;Zainab Waheed Abdullah,&nbsp;Heyam Razaq Atwan","doi":"10.1155/mdp2/5587820","DOIUrl":"https://doi.org/10.1155/mdp2/5587820","url":null,"abstract":"<p>This study utilized epoxy as a matrix for biocomposites reinforced with chicken feather fibers, which were produced by a manual mixing technique. Various loadings of feather fibers of 0.5, 1, 1.5, and 2 wt% were utilized following chemical treatment. Optical and scanning electron microscopies were employed to examine the morphological structure of biocomposites. Additionally, tensile, bending, impact, and hardness tests were conducted to assess the mechanical properties of biocomposites. Low fiber loadings of 0.5 and 1 wt% yielded enhanced mechanical properties relative to 1.5 and 2 wt% feather fiber loadings, attributable to better dispersion and integration within the epoxy matrix, as corroborated by morphological images. The manual mixing technique was more appropriate for feather loading below 2 wt%. Furthermore, the simulated results aligned well with the experimental tensile outcomes. The eco-friendly materials developed in this study could serve alternative applications, significantly reducing chicken feather waste in the environment and mitigating pollution issues.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/5587820","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145852631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlation Between Electrochemical Impedance Spectroscopy and LCR Parameter Meter in the Corrosion Processes of Steel-Reinforced Mortars","authors":"Juan Diego Bolaños Ortiz,&nbsp;Abilo Andres Velasquez Salazar,&nbsp;Yhan Paul Arias Jaramillo","doi":"10.1155/mdp2/9210864","DOIUrl":"https://doi.org/10.1155/mdp2/9210864","url":null,"abstract":"<p>Measuring corrosion in reinforcing steel embedded in mortar or concrete is a challenge that must always be considered. Electrochemical impedance spectroscopy (EIS) provides a useful estimation of corrosion rates, but its complexity and sensitivity mainly confine it to laboratory testing. On the other hand, the LCR meter, a small and portable device commonly used for testing circuits, measures impedance, capacitance, and inductance. Applying the EIS approach, which views elements as arrays of resistances and capacitances, allows inferring that it is possible to measure corrosion with the LCR meter by comparing it with EIS. To explore this, tests were conducted on cylindrical mortar samples with reinforcing steel, following a 2 × 3 factorial design with three replicates. After accelerated corrosion, a linear relationship was observed between the Rct parameter from EIS and the 100 Hz impedance from the LCR meter in samples subjected to impressed current. However, in samples subjected to carbonation, the techniques could not be correlated, possibly because the carbonation front had not yet depassivated the steel. The combination of chlorides and carbonation showed opposite effects: chlorides reduce the impedance of the mortar cover, while carbonation increases its resistivity. These results are a first step towards developing a new corrosion detection method based on the LCR meter, offering advantages in handling, time, cost, and portability.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/9210864","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved Lap Shear Strength of Ti6Al4V/CF-PPS Joints Through Electrical Discharge Machining Surface Texturing","authors":"Victor Caso Moreira,&nbsp;Artur Fernando de Vito Jr.,&nbsp;Adalto Farias,&nbsp;Fabrizio Leonardi,&nbsp;Sergio Delijaicov,&nbsp;Rodrigo Magnabosco","doi":"10.1155/mdp2/8956926","DOIUrl":"https://doi.org/10.1155/mdp2/8956926","url":null,"abstract":"<p>This study investigates friction-assisted spot joining (FASJ) of Ti6Al4V alloy and carbon fiber–reinforced polyphenylene sulfide (CF-PPS) composites using electrical discharge machining (EDM) surface pretreatment combined with process parameter optimization. EDM texturing generated superficial roughness that promoted mechanical interlocking between the molten polymer and the titanium surface. A central composite design was applied to evaluate the effects of rotational speed (RS) and plunge depth (PD), identifying optimal conditions that maximized lap shear strength while minimizing polymer degradation. Results showed that intermediate RSs favored bond formation by maintaining temperatures within the PPS melting range and preventing excessive thermal damage. Posttest characterization confirmed the formation of a bonded annular region that governed joint performance. The optimized process achieved lap shear strength values comparable to and, in some cases, exceeding those reported for other metal–composite joining techniques. Specifically, the EDM texturing process reached 33.1 MPa, outperforming most laser-welded Ti/CF-PEEK joints (2–37.3 MPa) and approaching the strength levels typically observed in aluminum–polymer benchmarks (≈55 MPa). These results demonstrate the effectiveness of the EDM-induced surface features in enhancing mechanical interlocking and interfacial adhesion. These findings demonstrate that combining EDM pretreatment with controlled thermal input enhances the reliability of FASJ for lightweight structural applications.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/8956926","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and Characterization of Multiphase WxTixMoNbTaV Refractory High-Entropy Alloys","authors":"Mohammed Khazal Hussain,&nbsp;Moneer H. Tolephih,&nbsp;Nasri S. M. Namer,&nbsp;Masoud Atapour","doi":"10.1155/mdp2/8780187","DOIUrl":"https://doi.org/10.1155/mdp2/8780187","url":null,"abstract":"<p>Refractory high-entropy alloys (RHEAs) have emerged as promising materials. They offer a viable alternative to nickel-based superalloys due to their excellent mechanical property stability at high temperatures, superior oxidation and corrosion resistance, and phase stability under extreme conditions. In this study, three different RHEA compositions of W_xTi_xMoNbTaV RHEAs (<i>x</i>₁ = (1, 0), <i>x</i>₂ = (0, 1), and <i>x</i>₃ = (0.5, 0.5)) were synthesized by partially or fully substituting titanium for tungsten under identical conditions to investigate the effect of this modification on the microstructure. Mechanical alloying was performed for 60 h to obtain powders with a single-phase BCC structure, followed by spark plasma sintering (SPS) at temperatures varying from 1200°C to 1400°C. XRD results indicated a relative stability of the BCC phase structure, with some phase segregations leading to the formation of some secondary phases in low percent. These secondary phases′ proportion and chemical composition varied depending on the alloy composition and sintering temperature. On the other hand, elevating the sintering temperature clearly enhances densification, although the extent of enhancement differs according to various alloy designs. Finally, the presence of the ductile-element–enriched phases is expected to significantly influence the microstructure and contribute to the enhancement of mechanical properties, which will be explored in a subsequent study.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/8780187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145530151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancements and Future Perspectives in Oil–Water Membrane Technology","authors":"Nthabiseng Jane Ramanamane,&nbsp;Mothibeli Pita","doi":"10.1155/mdp2/1885168","DOIUrl":"https://doi.org/10.1155/mdp2/1885168","url":null,"abstract":"<p>This review paper provides a comprehensive analysis of the advancements and future directions in oil–water membrane technology, a critical solution for addressing environmental challenges associated with wastewater treatment and oil pollution. The review focuses on various membrane technologies employed in oil–water separation, including microfiltration, ultrafiltration, and nanofiltration, highlighting their effectiveness and operational mechanisms. It discusses key challenges encountered by these technologies, such as membrane fouling, high operational costs, and limitations in large-scale applications, which hinder their broader adoption. The paper further examines the characteristics of oil–water membranes, including hydrophilicity, oleophobicity, pore size, and surface roughness, which are crucial in determining separation efficiency. Commonly used materials for developing oil–water filtration membranes are also explored, encompassing polymeric, ceramic, and hybrid materials, with a focus on innovations that enhance performance and sustainability. Additionally, the evaluation of membrane performance is addressed through metrics such as flux, rejection rate, and fouling resistance, offering insights into their suitability for various applications. The review also investigates the parameters varied during oil–water filtration, such as pressure and temperature, and their impact on membrane efficiency and durability. This paper is aimed at providing a roadmap for future research and development in oil–water membrane technology, emphasizing the need for durable, fouling-resistant membrane designs and the exploration of cost-effective materials (such as quartz-based media) to meet global water treatment demands.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2025 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mdp2/1885168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145273018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}